// SoftEther VPN Source Code - Developer Edition Master Branch
// Cedar Communication Module
// © 2020 Nokia

// Protocol.c
// SoftEther protocol related routines

#include "Protocol.h"

#include "Admin.h"
#include "Client.h"
#include "CM.h"
#include "DDNS.h"
#include "Hub.h"
#include "IPC.h"
#include "Link.h"
#include "Logging.h"
#include "Proto_IPsec.h"
#include "Proto_OpenVPN.h"
#include "Proto_PPP.h"
#include "Proto_SSTP.h"
#include "Radius.h"
#include "Sam.h"
#include "Server.h"
#include "UdpAccel.h"
#include "VLanUnix.h"
#include "WaterMark.h"
#include "WebUI.h"
#include "WinUi.h"
#include "Wpc.h"

#include "Mayaqua/Cfg.h"
#include "Mayaqua/DNS.h"
#include "Mayaqua/FileIO.h"
#include "Mayaqua/Internat.h"
#include "Mayaqua/Memory.h"
#include "Mayaqua/Microsoft.h"
#include "Mayaqua/Object.h"
#include "Mayaqua/OS.h"
#include "Mayaqua/Pack.h"
#include "Mayaqua/Secure.h"
#include "Mayaqua/Str.h"
#include "Mayaqua/Table.h"
#include "Mayaqua/Tick64.h"

// Download and save intermediate certificates if necessary
bool DownloadAndSaveIntermediateCertificatesIfNecessary(X *x)
{
	LIST *o;
	bool ret = false;
	// Validate arguments
	if (x == NULL)
	{
		return false;
	}

	if (x->root_cert)
	{
		return true;
	}

	o = NewCertList(true);

	ret = TryGetRootCertChain(o, x, true, NULL);

	FreeCertList(o);

	return ret;
}

// Attempt to fetch the full chain of the specified cert
bool TryGetRootCertChain(LIST *o, X *x, bool auto_save, X **found_root_x)
{
	bool ret = false;
	LIST *chain = NULL;
	LIST *current_chain_dir = NULL;
	// Validate arguments
	if (o == NULL || x == NULL)
	{
		return false;
	}

	chain = NewCertList(false);

	ret = TryGetParentCertFromCertList(o, x, chain);

	if (ret)
	{
		UINT i;
		DIRLIST *dir;
		wchar_t dirname[MAX_SIZE];
		wchar_t exedir[MAX_SIZE];

		GetDbDirW(exedir, sizeof(exedir));
		CombinePathW(dirname, sizeof(dirname), exedir, L"chain_certs");
		MakeDirExW(dirname);

		if (auto_save)
		{
			// delete the current auto_save files
			dir = EnumDirW(dirname);
			if (dir != NULL)
			{
				for (i = 0;i < dir->NumFiles;i++)
				{
					DIRENT *e = dir->File[i];

					if (e->Folder == false)
					{
						if (UniStartWith(e->FileNameW, AUTO_DOWNLOAD_CERTS_PREFIX))
						{
							wchar_t tmp[MAX_SIZE];

							CombinePathW(tmp, sizeof(tmp), dirname, e->FileNameW);

							FileDeleteW(tmp);
						}
					}
				}

				FreeDir(dir);
			}
		}

		current_chain_dir = NewCertList(false);
		AddAllChainCertsToCertList(current_chain_dir);

		for (i = 0;i < LIST_NUM(chain);i++)
		{
			wchar_t tmp[MAX_SIZE];
			X *xx = LIST_DATA(chain, i);

			GetAllNameFromName(tmp, sizeof(tmp), xx->subject_name);

			Debug("depth = %u, subject = %S\n", i, tmp);

			if (auto_save && CompareX(x, xx) == false && IsXInCertList(current_chain_dir, xx) == false)
			{
				wchar_t fn[MAX_PATH];
				char hex_a[128];
				wchar_t hex[128];
				UCHAR hash[SHA1_SIZE];
				wchar_t tmp[MAX_SIZE];
				BUF *b;

				GetXDigest(xx, hash, true);
				BinToStr(hex_a, sizeof(hex_a), hash, SHA1_SIZE);
				StrToUni(hex, sizeof(hex), hex_a);

				UniStrCpy(fn, sizeof(fn), AUTO_DOWNLOAD_CERTS_PREFIX);
				UniStrCat(fn, sizeof(fn), hex);
				UniStrCat(fn, sizeof(fn), L".cer");

				CombinePathW(tmp, sizeof(tmp), dirname, fn);

				b = XToBuf(xx, true);

				DumpBufW(b, tmp);

				FreeBuf(b);
			}

			if (xx->root_cert)
			{
				if (found_root_x != NULL)
				{
					*found_root_x = CloneX(xx);
				}
			}
		}
	}

	FreeCertList(chain);

	FreeCertList(current_chain_dir);

	return ret;
}

// Try get the parent cert
bool TryGetParentCertFromCertList(LIST *o, X *x, LIST *found_chain)
{
	bool ret = false;
	X *r;
	bool do_free = false;
	// Validate arguments
	if (o == NULL || x == NULL || found_chain == NULL)
	{
		return false;
	}

	if (LIST_NUM(found_chain) >= FIND_CERT_CHAIN_MAX_DEPTH)
	{
		return false;
	}

	Add(found_chain, CloneX(x));

	if (x->root_cert)
	{
		return true;
	}

	r = FindCertIssuerFromCertList(o, x);

	if (r == NULL)
	{
		if (IsEmptyStr(x->issuer_url) == false)
		{
			r = DownloadCert(x->issuer_url);

			if (CheckXEx(x, r, true, true) && CompareX(x, r) == false)
			{
				// found
				do_free = true;
			}
			else
			{
				// invalid
				FreeX(r);
				r = NULL;
			}
		}
	}

	if (r != NULL)
	{
		ret = TryGetParentCertFromCertList(o, r, found_chain);
	}

	if (do_free)
	{
		FreeX(r);
	}

	return ret;
}

// Find the issuer of the cert from the cert list
X *FindCertIssuerFromCertList(LIST *o, X *x)
{
	UINT i;
	// Validate arguments
	if (o == NULL || x == NULL)
	{
		return NULL;
	}

	if (x->root_cert)
	{
		return NULL;
	}

	for (i = 0;i < LIST_NUM(o);i++)
	{
		X *xx = LIST_DATA(o, i);

		if (CheckXEx(x, xx, true, true))
		{
			if (CompareX(x, xx) == false)
			{
				return xx;
			}
		}
	}

	return NULL;
}

// Download a cert by using HTTP
X *DownloadCert(char *url)
{
	BUF *b;
	URL_DATA url_data;
	X *ret = NULL;
	// Validate arguments
	if (IsEmptyStr(url))
	{
		return NULL;
	}

	Debug("Trying to download a cert from %s ...\n", url);

	if (ParseUrl(&url_data, url, false, NULL) == false)
	{
		Debug("Download failed.\n");
		return NULL;
	}

	b = HttpRequestEx(&url_data, NULL, CERT_HTTP_DOWNLOAD_TIMEOUT, CERT_HTTP_DOWNLOAD_TIMEOUT,
		NULL, false, NULL, NULL, NULL, NULL, NULL, CERT_HTTP_DOWNLOAD_MAXSIZE);

	if (b == NULL)
	{
		Debug("Download failed.\n");
		return NULL;
	}

	ret = BufToX(b, IsBase64(b));

	FreeBuf(b);

	Debug("Download ok.\n");
	return ret;
}

// New cert list
LIST *NewCertList(bool load_root_and_chain)
{
	LIST *o;

	o = NewList(NULL);

	if (load_root_and_chain)
	{
		AddAllRootCertsToCertList(o);
		AddAllChainCertsToCertList(o);
	}

	return o;
}

// Free cert list
void FreeCertList(LIST *o)
{
	UINT i;
	// Validate arguments
	if (o == NULL)
	{
		return;
	}

	for (i = 0;i < LIST_NUM(o);i++)
	{
		X *x = LIST_DATA(o, i);

		FreeX(x);
	}

	ReleaseList(o);
}

// Check whether the cert is in the cert list
bool IsXInCertList(LIST *o, X *x)
{
	UINT i;
	// Validate arguments
	if (o == NULL || x == NULL)
	{
		return false;
	}

	for (i = 0;i < LIST_NUM(o);i++)
	{
		X *xx = LIST_DATA(o, i);

		if (CompareX(x, xx))
		{
			return true;
		}
	}

	return false;
}

// Add a cert to the cert list
void AddXToCertList(LIST *o, X *x)
{
	// Validate arguments
	if (o == NULL || x == NULL)
	{
		return;
	}

	if (IsXInCertList(o, x))
	{
		return;
	}

	if (CheckXDateNow(x) == false)
	{
		return;
	}

	Add(o, CloneX(x));
}

// Add all chain certs to the cert list
void AddAllChainCertsToCertList(LIST *o)
{
	wchar_t dirname[MAX_SIZE];
	wchar_t exedir[MAX_SIZE];
	DIRLIST *dir;
	// Validate arguments
	if (o == NULL)
	{
		return;
	}

	GetDbDirW(exedir, sizeof(exedir));

	CombinePathW(dirname, sizeof(dirname), exedir, L"chain_certs");

	MakeDirExW(dirname);

	dir = EnumDirW(dirname);

	if (dir != NULL)
	{
		UINT i;

		for (i = 0;i < dir->NumFiles;i++)
		{
			DIRENT *e = dir->File[i];

			if (e->Folder == false)
			{
				wchar_t tmp[MAX_SIZE];
				X *x;

				CombinePathW(tmp, sizeof(tmp), dirname, e->FileNameW);

				x = FileToXW(tmp);

				if (x != NULL)
				{
					AddXToCertList(o, x);

					FreeX(x);
				}
			}
		}

		FreeDir(dir);
	}
}

// Add all root certs to the cert list
void AddAllRootCertsToCertList(LIST *o)
{
	BUF *buf;
	PACK *p;
	UINT num_ok = 0, num_error = 0;
	// Validate arguments
	if (o == NULL)
	{
		return;
	}

	buf = ReadDump(ROOT_CERTS_FILENAME);
	if (buf == NULL)
	{
		return;
	}

	p = BufToPack(buf);

	if (p != NULL)
	{
		UINT num = PackGetIndexCount(p, "cert");
		UINT i;

		for (i = 0;i < num;i++)
		{
			bool ok = false;
			BUF *b = PackGetBufEx(p, "cert", i);

			if (b != NULL)
			{
				X *x = BufToX(b, false);

				if (x != NULL)
				{
					AddXToCertList(o, x);

					ok = true;

					FreeX(x);
				}

				FreeBuf(b);
			}

			if (ok)
			{
				num_ok++;
			}
			else
			{
				num_error++;
			}
		}

		FreePack(p);
	}

	FreeBuf(buf);

	Debug("AddAllRootCertsToCertList: ok=%u error=%u total_list_len=%u\n", num_ok, num_error, LIST_NUM(o));
}

// Convert the date of YYYYMMDD format to a number
UINT64 ShortStrToDate64(char *str)
{
	UINT v;
	SYSTEMTIME st;
	// Validate arguments
	if (str == NULL)
	{
		return 0;
	}

	v = ToInt(str);

	Zero(&st, sizeof(st));

	st.wYear = (v % 100000000) / 10000;
	st.wMonth = (v % 10000) / 100;
	st.wDay = v % 100;

	return SystemToUINT64(&st);
}

// Handle the response that is returned from the server in the update client
void UpdateClientThreadProcessResults(UPDATE_CLIENT *c, BUF *b)
{
	bool exit = false;
	// Validate arguments
	if (c == NULL || b == NULL)
	{
		return;
	}

	SeekBufToBegin(b);

	while (true)
	{
		char *line = CfgReadNextLine(b);
		if (line == NULL)
		{
			break;
		}

		Trim(line);

		if (StartWith(line, "#") == false && IsEmptyStr(line) == false)
		{
			TOKEN_LIST *t = ParseTokenWithNullStr(line, " \t");

			if (t != NULL)
			{
				if (t->NumTokens >= 5)
				{
					if (StrCmpi(t->Token[0], c->FamilyName) == 0)
					{
						// Match
						UINT64 date = ShortStrToDate64(t->Token[1]);
						if (date != 0)
						{
							UINT build = ToInt(t->Token[2]);
							if (build != 0)
							{
								if (build > c->MyBuild && build > c->LatestBuild && build > c->Setting.LatestIgnoreBuild)
								{
									c->Callback(c, build, date, t->Token[3], t->Token[4], &c->HaltFlag, c->Param);

									c->LatestBuild = build;

									exit = true;
								}
							}
						}
					}
				}

				FreeToken(t);
			}
		}

		Free(line);

		if (exit)
		{
			break;
		}
	}
}

// Update client main process
void UpdateClientThreadMain(UPDATE_CLIENT *c)
{
	char url[MAX_SIZE];
	char id[MAX_SIZE];
	URL_DATA data;
	BUF *cert_hash;
	UINT ret = 0;
	BUF *recv;
	// Validate arguments
	if (c == NULL)
	{
		return;
	}

	// Generate the URL
	Format(url, sizeof(url), IsUseAlternativeHostname() ? UPDATE_SERVER_URL_CHINA : UPDATE_SERVER_URL_GLOBAL, c->FamilyName, c->SoftwareName, c->MyBuild, c->MyLanguage);

	if (IsEmptyStr(c->ClientId) == false)
	{
		Format(id, sizeof(id), "&id=%s", c->ClientId);
		StrCat(url, sizeof(url), id);
	}

	// Get a text file at this URL
	if (ParseUrl(&data, url, false, NULL) == false)
	{
		return;
	}

	cert_hash = StrToBin(UPDATE_SERVER_CERT_HASH);

	StrCpy(data.SniString, sizeof(data.SniString), DDNS_SNI_VER_STRING);

	recv = HttpRequestEx3(&data, NULL, UPDATE_CONNECT_TIMEOUT, UPDATE_COMM_TIMEOUT, &ret, false, NULL, NULL,
		NULL, ((cert_hash != NULL && (cert_hash->Size % SHA1_SIZE) == 0) ? cert_hash->Buf : NULL),
		(cert_hash != NULL ? (cert_hash->Size / SHA1_SIZE) : 0),
		(bool *)&c->HaltFlag, 0, NULL, NULL);

	FreeBuf(cert_hash);

	if (recv != NULL)
	{
		UpdateClientThreadProcessResults(c, recv);

		FreeBuf(recv);
	}
}

// Update client main thread
void UpdateClientThreadProc(THREAD *thread, void *param)
{
	UPDATE_CLIENT *c = (UPDATE_CLIENT *)param;
	bool first_loop = true;
	// Validate arguments
	if (thread == NULL || param == NULL)
	{
		return;
	}

	while (true)
	{
		// Termination check
		if (c->HaltFlag)
		{
			break;
		}

		if (first_loop == false)
		{
			// Wait for the foreground
			if (c->IsForegroundCb != NULL)
			{
				while (true)
				{
					if (c->HaltFlag)
					{
						break;
					}

					if (c->IsForegroundCb(c, c->Param))
					{
						break;
					}

					Wait(c->HaltEvent, 1000);
				}
			}
		}

		first_loop = false;

		if (c->HaltFlag)
		{
			break;
		}

		if (c->Setting.DisableCheck == false)
		{
			UpdateClientThreadMain(c);
		}

		// Wait until the next attempt
		Wait(c->HaltEvent, GenRandInterval(UPDATE_CHECK_INTERVAL_MIN, UPDATE_CHECK_INTERVAL_MAX));
	}
}

// Update the configuration of the update client
void SetUpdateClientSetting(UPDATE_CLIENT *c, UPDATE_CLIENT_SETTING *s)
{
	// Validate arguments
	if (c == NULL || s == NULL)
	{
		return;
	}

	Copy(&c->Setting, s, sizeof(UPDATE_CLIENT_SETTING));

	Set(c->HaltEvent);
}

// Start the update client
UPDATE_CLIENT *NewUpdateClient(UPDATE_NOTIFY_PROC *cb, UPDATE_ISFOREGROUND_PROC *isforeground_cb, void *param, char *family_name, char *software_name, wchar_t *software_title, UINT my_build, UINT64 my_date, char *my_lang, UPDATE_CLIENT_SETTING *current_setting, char *client_id)
{
	UPDATE_CLIENT *c;
	// Validate arguments
	if (family_name == NULL || software_title == NULL || software_name == NULL || my_build == 0 ||
		my_lang == NULL || current_setting == NULL || cb == NULL)
	{
		return NULL;
	}

	c = ZeroMalloc(sizeof(UPDATE_CLIENT));

	c->Callback = cb;
	c->IsForegroundCb = isforeground_cb;

	StrCpy(c->ClientId, sizeof(c->ClientId), client_id);
	StrCpy(c->FamilyName, sizeof(c->FamilyName), family_name);
	StrCpy(c->SoftwareName, sizeof(c->SoftwareName), software_name);
	UniStrCpy(c->SoftwareTitle, sizeof(c->SoftwareTitle), software_title);
	c->MyBuild = my_build;
	c->MyDate = my_date;
	StrCpy(c->MyLanguage, sizeof(c->MyLanguage), my_lang);

	Copy(&c->Setting, current_setting, sizeof(c->Setting));

	c->Param = param;

	c->HaltEvent = NewEvent();

	// Create a thread
	c->Thread = NewThread(UpdateClientThreadProc, c);

	return c;
}

// Terminate the update client
void FreeUpdateClient(UPDATE_CLIENT *c)
{
	// Validate arguments
	if (c == NULL)
	{
		return;
	}

	// Thread stop
	c->HaltFlag = true;
	Set(c->HaltEvent);

	// Wait for thread termination
	WaitThread(c->Thread, INFINITE);

	ReleaseThread(c->Thread);
	ReleaseEvent(c->HaltEvent);

	Free(c);
}

// Generate unique IDs for each machine
void GenerateMachineUniqueHash(void *data)
{
	BUF *b;
	char name[64];
	OS_INFO *osinfo;
	UINT64 iphash = 0;
	// Validate arguments
	if (data == NULL)
	{
		return;
	}

	iphash = GetHostIPAddressListHash();

	b = NewBuf();
	GetMachineName(name, sizeof(name));

	osinfo = GetOsInfo();

	WriteBuf(b, name, StrLen(name));

	WriteBufInt64(b, iphash);

	WriteBuf(b, &osinfo->OsType, sizeof(osinfo->OsType));
	WriteBuf(b, osinfo->KernelName, StrLen(osinfo->KernelName));
	WriteBuf(b, osinfo->KernelVersion, StrLen(osinfo->KernelVersion));
	WriteBuf(b, osinfo->OsProductName, StrLen(osinfo->OsProductName));
	WriteBuf(b, &osinfo->OsServicePack, sizeof(osinfo->OsServicePack));
	WriteBuf(b, osinfo->OsSystemName, StrLen(osinfo->OsSystemName));
	WriteBuf(b, osinfo->OsVendorName, StrLen(osinfo->OsVendorName));
	WriteBuf(b, osinfo->OsVersion, StrLen(osinfo->OsVersion));

	Sha0(data, b->Buf, b->Size);

	FreeBuf(b);
}

// Convert a node information to a string
void NodeInfoToStr(wchar_t *str, UINT size, NODE_INFO *info)
{
	char client_ip[128], server_ip[128], proxy_ip[128], unique_id[128];
	// Validate arguments
	if (str == NULL || info == NULL)
	{
		return;
	}

	IPToStr4or6(client_ip, sizeof(client_ip), info->ClientIpAddress, info->ClientIpAddress6);
	IPToStr4or6(server_ip, sizeof(server_ip), info->ServerIpAddress, info->ServerIpAddress6);
	IPToStr4or6(proxy_ip, sizeof(proxy_ip), info->ProxyIpAddress, info->ProxyIpAddress6);
	BinToStr(unique_id, sizeof(unique_id), info->UniqueId, sizeof(info->UniqueId));

	UniFormat(str, size, _UU("LS_NODE_INFO_TAG"), info->ClientProductName,
		Endian32(info->ClientProductVer), Endian32(info->ClientProductBuild),
		info->ServerProductName, Endian32(info->ServerProductVer), Endian32(info->ServerProductBuild),
		info->ClientOsName, info->ClientOsVer, info->ClientOsProductId,
		info->ClientHostname, client_ip, Endian32(info->ClientPort),
		info->ServerHostname, server_ip, Endian32(info->ServerPort),
		info->ProxyHostname, proxy_ip, Endian32(info->ProxyPort),
		info->HubName, unique_id);
}

// Accept the password change
UINT ChangePasswordAccept(CONNECTION *c, PACK *p)
{
	CEDAR *cedar;
	UCHAR random[SHA1_SIZE];
	char hubname[MAX_HUBNAME_LEN + 1];
	char username[MAX_USERNAME_LEN + 1];
	UCHAR secure_old_password[SHA1_SIZE];
	UCHAR new_password[SHA1_SIZE];
	UCHAR new_password_ntlm[SHA1_SIZE];
	UCHAR check_secure_old_password[SHA1_SIZE];
	UINT ret = ERR_NO_ERROR;
	HUB *hub;
	// Validate arguments
	if (c == NULL || p == NULL)
	{
		return ERR_INTERNAL_ERROR;
	}

	Copy(random, c->Random, SHA1_SIZE);
	if (PackGetStr(p, "hubname", hubname, sizeof(hubname)) == false ||
		PackGetStr(p, "username", username, sizeof(username)) == false ||
		PackGetData2(p, "secure_old_password", secure_old_password, sizeof(secure_old_password)) == false ||
		PackGetData2(p, "new_password", new_password, sizeof(new_password)) == false)
	{
		return ERR_PROTOCOL_ERROR;
	}

	if (PackGetData2(p, "new_password_ntlm", new_password_ntlm, MD5_SIZE) == false)
	{
		Zero(new_password_ntlm, sizeof(new_password_ntlm));
	}

	cedar = c->Cedar;

	LockHubList(cedar);
	{
		hub = GetHub(cedar, hubname);
	}
	UnlockHubList(cedar);

	if (hub == NULL)
	{
		ret = ERR_HUB_NOT_FOUND;
	}
	else
	{
		char tmp[MAX_SIZE];

		if (GetHubAdminOption(hub, "deny_change_user_password") != 0)
		{
			ReleaseHub(hub);
			return ERR_NOT_ENOUGH_RIGHT;
		}

		IPToStr(tmp, sizeof(tmp), &c->FirstSock->RemoteIP);
		HLog(hub, "LH_CHANGE_PASSWORD_1", c->Name, tmp);

		AcLock(hub);
		{
			USER *u = AcGetUser(hub, username);
			if (u == NULL)
			{
				HLog(hub, "LH_CHANGE_PASSWORD_2", c->Name, username);
				ret = ERR_OLD_PASSWORD_WRONG;
			}
			else
			{
				Lock(u->lock);
				{
					if (u->AuthType	!= AUTHTYPE_PASSWORD)
					{
						// Not a password authentication
						HLog(hub, "LH_CHANGE_PASSWORD_3", c->Name, username);
						ret = ERR_USER_AUTHTYPE_NOT_PASSWORD;
					}
					else
					{
						bool fix_password = false;
						if (u->Policy != NULL)
						{
							fix_password = u->Policy->FixPassword;
						}
						else
						{
							if (u->Group != NULL)
							{
								if (u->Group->Policy != NULL)
								{
									fix_password = u->Group->Policy->FixPassword;
								}
							}
						}
						if (fix_password == false)
						{
							// Confirmation of the old password
							AUTHPASSWORD *pw = (AUTHPASSWORD *)u->AuthData;

							SecurePassword(check_secure_old_password, pw->HashedKey, random);
							if (Cmp(check_secure_old_password, secure_old_password, SHA1_SIZE) != 0)
							{
								// Old password is incorrect
								ret = ERR_OLD_PASSWORD_WRONG;
								HLog(hub, "LH_CHANGE_PASSWORD_4", c->Name, username);
							}
							else
							{
								// Write a new password
								if (Cmp(pw->HashedKey, new_password, SHA1_SIZE) != 0 || IsZero(pw->NtLmSecureHash, MD5_SIZE))
								{
									Copy(pw->HashedKey, new_password, SHA1_SIZE);
									Copy(pw->NtLmSecureHash, new_password_ntlm, MD5_SIZE);
									IncrementServerConfigRevision(cedar->Server);
								}
								HLog(hub, "LH_CHANGE_PASSWORD_5", c->Name, username);
							}
						}
						else
						{
							// Password change is prohibited
							ret = ERR_NOT_ENOUGH_RIGHT;
						}
					}
				}
				Unlock(u->lock);

				ReleaseUser(u);
			}
		}
		AcUnlock(hub);
		ReleaseHub(hub);
	}

	return ret;
}

// Change the password
UINT ChangePassword(CEDAR *cedar, CLIENT_OPTION *o, char *hubname, char *username, char *old_pass, char *new_pass)
{
	UINT ret = ERR_NO_ERROR;
	UCHAR old_password[SHA1_SIZE];
	UCHAR secure_old_password[SHA1_SIZE];
	UCHAR new_password[SHA1_SIZE];
	UCHAR new_password_ntlm[MD5_SIZE];
	SOCK *sock;
	SESSION *s;
	// Validate arguments
	if (cedar == NULL || o == NULL || hubname == NULL || username == NULL || old_pass == NULL || new_pass == NULL)
	{
		return ERR_INTERNAL_ERROR;
	}


	// Create a session
	s = NewRpcSessionEx(cedar, o, &ret, NULL);

	if (s != NULL)
	{
		PACK *p = NewPack();

		sock = s->Connection->FirstSock;

		HashPassword(old_password, username, old_pass);
		SecurePassword(secure_old_password, old_password, s->Connection->Random);
		HashPassword(new_password, username, new_pass);
		GenerateNtPasswordHash(new_password_ntlm, new_pass);

		PackAddClientVersion(p, s->Connection);

		PackAddStr(p, "method", "password");
		PackAddStr(p, "hubname", hubname);
		PackAddStr(p, "username", username);
		PackAddData(p, "secure_old_password", secure_old_password, SHA1_SIZE);
		PackAddData(p, "new_password", new_password, SHA1_SIZE);
		PackAddData(p, "new_password_ntlm", new_password_ntlm, MD5_SIZE);

		if (HttpClientSend(sock, p))
		{
			PACK *p = HttpClientRecv(sock);
			if (p == NULL)
			{
				ret = ERR_DISCONNECTED;
			}
			else
			{
				ret = GetErrorFromPack(p);
			}
			FreePack(p);
		}
		else
		{
			ret = ERR_DISCONNECTED;
		}
		FreePack(p);

		ReleaseSession(s);
	}

	return ret;
}

// Enumerate HUBs
TOKEN_LIST *EnumHub(SESSION *s)
{
	SOCK *sock;
	TOKEN_LIST *ret;
	PACK *p;
	UINT num;
	UINT i;
	// Validate arguments
	if (s == NULL || s->Connection == NULL)
	{
		return NULL;
	}

	sock = s->Connection->FirstSock;
	if (sock == NULL)
	{
		return NULL;
	}

	// Set the Timeout
	SetTimeout(sock, 10000);

	p = NewPack();
	PackAddStr(p, "method", "enum_hub");

	PackAddClientVersion(p, s->Connection);

	if (HttpClientSend(sock, p) == false)
	{
		FreePack(p);
		return NULL;
	}
	FreePack(p);

	p = HttpClientRecv(sock);
	if (p == NULL)
	{
		return NULL;
	}

	num = PackGetInt(p, "NumHub");
	ret = ZeroMalloc(sizeof(TOKEN_LIST));
	ret->NumTokens = num;
	ret->Token = ZeroMalloc(sizeof(char *) * num);
	for (i = 0;i < num;i++)
	{
		char tmp[MAX_SIZE];
		if (PackGetStrEx(p, "HubName", tmp, sizeof(tmp), i))
		{
			ret->Token[i] = CopyStr(tmp);
		}
	}
	FreePack(p);

	return ret;
}

// Server accepts a connection from client
bool ServerAccept(CONNECTION *c)
{
	bool ret = false;
	UINT err;
	PACK *p;
	char username_real[MAX_SIZE];
	char method[MAX_SIZE];
	char hubname[MAX_SIZE];
	char username[MAX_SIZE];
	char groupname[MAX_SIZE];
	UCHAR session_key[SHA1_SIZE];
	UCHAR ticket[SHA1_SIZE];
	UINT authtype;
	POLICY *policy;
	UINT assigned_vlan_id = 0;
	UCHAR assigned_ipc_mac_address[6];
	HUB *hub;
	SESSION *s = NULL;
	UINT64 user_expires = 0;
	bool use_encrypt;
	bool use_compress;
	bool half_connection;
	UINT adjust_mss;
	bool use_udp_acceleration_client;
	UINT client_udp_acceleration_max_version = 1;
	UINT udp_acceleration_version = 1;
	UINT client_rudp_bulk_max_version = 1;
	UINT rudp_bulk_version = 1;
	bool support_hmac_on_udp_acceleration_client = false;
	bool support_udp_accel_fast_disconnect_detect;
	bool use_hmac_on_udp_acceleration = false;
	bool supress_return_pack_error = false;
	IP udp_acceleration_client_ip;
	UCHAR udp_acceleration_client_key[UDP_ACCELERATION_COMMON_KEY_SIZE_V1];
	UCHAR udp_acceleration_client_key_v2[UDP_ACCELERATION_COMMON_KEY_SIZE_V2];
	UINT udp_acceleration_client_port;
	bool admin_mode = false;
	UINT direction;
	UINT max_connection;
	UINT timeout;
	bool no_reconnect_to_session = false;
	bool farm_controller = false;
	bool farm_member = false;
	bool farm_mode = false;
	bool require_bridge_routing_mode;
	bool require_monitor_mode;
	bool support_bulk_on_rudp = false;
	bool support_hmac_on_bulk_of_rudp = false;
	bool support_udp_recovery = false;
	bool enable_bulk_on_rudp = false;
	bool enable_udp_recovery = false;
	bool enable_hmac_on_bulk_of_rudp = false;
	bool use_client_license = false, use_bridge_license = false;
	bool local_host_session = false;
	char sessionname[MAX_SESSION_NAME_LEN + 1];
	bool is_server_or_bridge = false;
	bool qos = false;
	bool cluster_dynamic_secure_nat = false;
	bool no_save_password = false;
	NODE_INFO node;
	wchar_t *msg = NULL;
	bool suppress_client_update_notification = false;
	USER *loggedin_user_object = NULL;
	FARM_MEMBER *f = NULL;
	SERVER *server = NULL;
	POLICY ticketed_policy;
	UCHAR unique[SHA1_SIZE], unique2[SHA1_SIZE];
	CEDAR *cedar;
	RPC_WINVER winver;
	UINT client_id;
	bool no_more_users_in_server = false;
	UCHAR mschap_v2_server_response_20[20];
	UINT ms_chap_error = 0;
	bool is_empty_password = false;
	char *error_detail = NULL;
	char *error_detail_2 = NULL;
	char ctoken_hash_str[64];
	EAP_CLIENT *release_me_eap_client = NULL;

	// Validate arguments
	if (c == NULL)
	{
		return false;
	}

	GenerateMachineUniqueHash(unique2);

	Zero(ctoken_hash_str, sizeof(ctoken_hash_str));

	Zero(assigned_ipc_mac_address, sizeof(assigned_ipc_mac_address));

	Zero(mschap_v2_server_response_20, sizeof(mschap_v2_server_response_20));

	Zero(&udp_acceleration_client_ip, sizeof(udp_acceleration_client_ip));
	udp_acceleration_client_port = 0;
	Zero(udp_acceleration_client_key, sizeof(udp_acceleration_client_key));
	Zero(udp_acceleration_client_key_v2, sizeof(udp_acceleration_client_key_v2));

	Zero(&winver, sizeof(winver));

	StrCpy(groupname, sizeof(groupname), "");
	StrCpy(sessionname, sizeof(sessionname), "");

	if (IsZero(c->CToken_Hash, SHA1_SIZE) == false)
	{
		BinToStr(ctoken_hash_str, sizeof(ctoken_hash_str), c->CToken_Hash, SHA1_SIZE);
	}

	cedar = c->Cedar;

	// Get the license status

	no_more_users_in_server = SiTooManyUserObjectsInServer(cedar->Server, true);

	c->Status = CONNECTION_STATUS_NEGOTIATION;

	if (c->Cedar->Server != NULL)
	{
		SERVER *s = c->Cedar->Server;
		server = s;

		if (s->ServerType == SERVER_TYPE_FARM_MEMBER)
		{
			farm_member = true;
			farm_mode = true;
		}

		if (s->ServerType == SERVER_TYPE_FARM_CONTROLLER)
		{
			farm_controller = true;
			farm_mode = true;
		}
	}

	// Receive the signature
	Debug("Downloading Signature...\n");
	error_detail_2 = NULL;
	if (ServerDownloadSignature(c, &error_detail_2) == false)
	{
		if (c->Type == CONNECTION_TYPE_ADMIN_RPC)
		{
			c->Err = ERR_NO_ERROR;
		}

		if (error_detail_2 == NULL)
		{
			error_detail = "ServerDownloadSignature";
		}
		else
		{
			error_detail = error_detail_2;
		}

		supress_return_pack_error = true;

		goto CLEANUP;
	}

	// Send a Hello packet
	Debug("Uploading Hello...\n");
	if (ServerUploadHello(c) == false)
	{
		error_detail = "ServerUploadHello";
		goto CLEANUP;
	}

	// Receive the authentication data
	Debug("Auth...\n");

	p = HttpServerRecv(c->FirstSock);
	if (p == NULL)
	{
		// The connection disconnected
		c->Err = ERR_DISCONNECTED;
		error_detail = "RecvAuth1";
		goto CLEANUP;
	}

	if (err = GetErrorFromPack(p))
	{
		// An error has occured
		FreePack(p);
		c->Err = err;
		error_detail = "RecvAuth2";
		goto CLEANUP;
	}

	// Get the method
	if (GetMethodFromPack(p, method, sizeof(method)) == false)
	{
		// Protocol error
		FreePack(p);
		c->Err = ERR_PROTOCOL_ERROR;
		error_detail = "GetMethodFromPack";
		goto CLEANUP;
	}

	// Brand string for the connection limit
	{
		char tmp[20];
		char *branded_ctos = _SS("BRANDED_C_TO_S");
		PackGetStr(p, "branded_ctos", tmp, sizeof(tmp));

		if(StrCmpi(method, "login") == 0 && StrLen(branded_ctos) > 0 && StrCmpi(branded_ctos, tmp) != 0)
		{
			FreePack(p);
			c->Err = ERR_BRANDED_C_TO_S;
			goto CLEANUP;
		}
	}

	// Get the client version
	PackGetStr(p, "client_str", c->ClientStr, sizeof(c->ClientStr));
	c->ClientVer = PackGetInt(p, "client_ver");
	c->ClientBuild = PackGetInt(p, "client_build");

	if (SearchStrEx(c->ClientStr, "server", 0, false) != INFINITE ||
		SearchStrEx(c->ClientStr, "bridge", 0, false) != INFINITE)
	{
		is_server_or_bridge = true;
	}

	// Get the client Windows version
	InRpcWinVer(&winver, p);

	DecrementNoSsl(c->Cedar, &c->FirstSock->RemoteIP, 2);

	if (StrCmpi(method, "login") == 0)
	{
		bool auth_ret = false;

		Debug("Login...\n");
		c->Status = CONNECTION_STATUS_USERAUTH;

		c->Type = CONNECTION_TYPE_LOGIN;

		if (no_more_users_in_server)
		{
			// There are many users than are allowed in the VPN Server
			FreePack(p);
			c->Err = ERR_TOO_MANY_USER;
			error_detail = "ERR_TOO_MANY_USER";
			goto CLEANUP;
		}

		// Such as the client name
		if (PackGetStr(p, "hello", c->ClientStr, sizeof(c->ClientStr)) == false)
		{
			StrCpy(c->ClientStr, sizeof(c->ClientStr), "Unknown");
		}
		c->ServerVer = GetCedarVersionNumber();
		c->ServerBuild = CEDAR_VERSION_BUILD;

		// Get the NODE_INFO
		Zero(&node, sizeof(node));
		InRpcNodeInfo(&node, p);

		// Protocol
		c->Protocol = GetProtocolFromPack(p);
		if (c->Protocol == CONNECTION_UDP)
		{
			// Release the structure of the TCP connection
			if (c->Tcp)
			{
				ReleaseList(c->Tcp->TcpSockList);
				Free(c->Tcp);
			}
		}

		if (GetServerCapsBool(c->Cedar->Server, "b_vpn_client_connect") == false)
		{
			// VPN client is unable to connect
			FreePack(p);
			c->Err = ERR_NOT_SUPPORTED;
			goto CLEANUP;
		}

		// Get authentication method and initiate login process
		authtype = GetAuthTypeFromPack(p);
		if (authtype == AUTHTYPE_WIREGUARD_KEY)
		{
			WGK *wgk, tmp;
			bool ok = false;

			if (PackGetStr(p, "key", tmp.Key, sizeof(tmp.Key)) == false)
			{
				FreePack(p);
				c->Err = ERR_PROTOCOL_ERROR;
				error_detail = "GetWireGuardKeyFromPack";
				goto CLEANUP;
			}

			LockList(c->Cedar->WgkList);
			{
				wgk = Search(c->Cedar->WgkList, &tmp);
				if (wgk != NULL)
				{
					ok = true;
					StrCpy(hubname, sizeof(hubname), wgk->Hub);
					StrCpy(username, sizeof(username), wgk->User);
					StrCpy(node.HubName, sizeof(node.HubName), hubname);
				}
			}
			UnlockList(c->Cedar->WgkList);

			if (ok == false)
			{
				FreePack(p);
				c->Err = ERR_AUTH_FAILED;
				SLog(c->Cedar, "LS_WG_KEY_NOT_FOUND", c->Name, hubname);
				error_detail = "ERR_AUTH_FAILED";
				goto CLEANUP;
			}
		}
		else if (GetHubnameAndUsernameFromPack(p, username, sizeof(username), hubname, sizeof(hubname)) == false)
		{
			FreePack(p);
			c->Err = ERR_PROTOCOL_ERROR;
			error_detail = "GetHubnameAndUsernameFromPack";
			goto CLEANUP;
		}

		if (farm_member)
		{
			bool ok = false;

			if (StrCmpi(username, ADMINISTRATOR_USERNAME) == 0 &&
				authtype == AUTHTYPE_PASSWORD)
			{
				ok = true;
			}

			if (authtype == AUTHTYPE_TICKET)
			{
				ok = true;
			}

			if (ok == false)
			{
				// Logging on directly to server farm members by
				// non-Administrators are prohibited
				FreePack(p);
				SLog(c->Cedar, "LS_FARMMEMBER_NOT_ADMIN", c->Name, hubname, ADMINISTRATOR_USERNAME, username);
				c->Err = ERR_ACCESS_DENIED;
				goto CLEANUP;
			}
		}

		Debug("Username = %s, HubName = %s\n", username, hubname);
		LockHubList(c->Cedar);
		{
			hub = GetHub(c->Cedar, hubname);
		}
		UnlockHubList(c->Cedar);
		if (hub == NULL)
		{
			// The HUB does not exist
			FreePack(p);
			c->Err = ERR_HUB_NOT_FOUND;
			SLog(c->Cedar, "LS_HUB_NOT_FOUND", c->Name, hubname);
			error_detail = "ERR_HUB_NOT_FOUND";
			goto CLEANUP;
		}

		if (hub->ForceDisableComm)
		{
			// Communication function is disabled
			FreePack(p);
			c->Err = ERR_SERVER_CANT_ACCEPT;
			error_detail = "ERR_COMM_DISABLED";
			ReleaseHub(hub);
			goto CLEANUP;
		}

		if (GetGlobalServerFlag(GSF_DISABLE_AC) == 0)
		{
			if (hub->HubDb != NULL && c->FirstSock != NULL)
			{
				IP ip;

				Copy(&ip, &c->FirstSock->RemoteIP, sizeof(IP));

				if (IsIpDeniedByAcList(&ip, hub->HubDb->AcList))
				{
					char ip_str[64];
					// Access denied
					ReleaseHub(hub);
					hub = NULL;
					FreePack(p);
					c->Err = ERR_IP_ADDRESS_DENIED;
					IPToStr(ip_str, sizeof(ip_str), &ip);
					SLog(c->Cedar, "LS_IP_DENIED", c->Name, ip_str);
					goto CLEANUP;
				}
			}
		}

		Lock(hub->lock);
		{
			UINT cert_size = 0;
			void *cert_buf = NULL;
			USER *user;
			USERGROUP *group;
			char plain_password[MAX_PASSWORD_LEN + 1];
			RADIUS_LOGIN_OPTION radius_login_opt;

			if (hub->Halt || hub->Offline)
			{
				// HUB is off-line
				FreePack(p);
				Unlock(hub->lock);
				ReleaseHub(hub);
				c->Err = ERR_HUB_STOPPING;
				goto CLEANUP;
			}

			Zero(&radius_login_opt, sizeof(radius_login_opt));

			if (hub->Option != NULL)
			{
				radius_login_opt.In_CheckVLanId = hub->Option->AssignVLanIdByRadiusAttribute;
				radius_login_opt.In_DenyNoVlanId = hub->Option->DenyAllRadiusLoginWithNoVlanAssign;
				if (hub->Option->UseHubNameAsRadiusNasId)
				{
					StrCpy(radius_login_opt.NasId, sizeof(radius_login_opt.NasId), hubname);
				}
			}

			// Get the various flags
			use_encrypt = PackGetInt(p, "use_encrypt") == 0 ? false : true;
			use_compress = PackGetInt(p, "use_compress") == 0 ? false : true;
			max_connection = PackGetInt(p, "max_connection");
			half_connection = PackGetInt(p, "half_connection") == 0 ? false : true;
			qos = PackGetInt(p, "qos") ? true : false;
			client_id = PackGetInt(p, "client_id");
			adjust_mss = PackGetInt(p, "adjust_mss");
			use_udp_acceleration_client = PackGetBool(p, "use_udp_acceleration");
			client_udp_acceleration_max_version = PackGetInt(p, "udp_acceleration_max_version");
			if (client_udp_acceleration_max_version == 0)
			{
				client_udp_acceleration_max_version = 1;
			}
			client_rudp_bulk_max_version = PackGetInt(p, "rudp_bulk_max_version");
			if (client_rudp_bulk_max_version == 0)
			{
				client_rudp_bulk_max_version = 1;
			}
			support_hmac_on_udp_acceleration_client = PackGetBool(p, "support_hmac_on_udp_acceleration");
			support_udp_accel_fast_disconnect_detect = PackGetBool(p, "support_udp_accel_fast_disconnect_detect");
			support_bulk_on_rudp = PackGetBool(p, "support_bulk_on_rudp");
			support_hmac_on_bulk_of_rudp = PackGetBool(p, "support_hmac_on_bulk_of_rudp");
			support_udp_recovery = PackGetBool(p, "support_udp_recovery");

			if (c->IsInProc)
			{
				char tmp[MAX_SIZE];
				UINT64 ptr;

				ptr = PackGetInt64(p, "release_me_eap_client");
				if (ptr != 0)
				{
					release_me_eap_client = (EAP_CLIENT *)ptr;
				}

				PackGetStr(p, "inproc_postfix", c->InProcPrefix, sizeof(c->InProcPrefix));
				Zero(tmp, sizeof(tmp));
				PackGetStr(p, "inproc_cryptname", tmp, sizeof(tmp));
				c->InProcLayer = PackGetInt(p, "inproc_layer");

				if (c->FirstSock != NULL)
				{
					if (IsEmptyStr(c->InProcPrefix) == false)
					{
						Format(c->FirstSock->UnderlayProtocol, sizeof(c->FirstSock->UnderlayProtocol), SOCK_UNDERLAY_INPROC_EX, c->InProcPrefix);
						AddProtocolDetailsStr(c->FirstSock->UnderlayProtocol, sizeof(c->FirstSock->UnderlayProtocol), c->InProcPrefix);
					}
				}

				if (c->CipherName != NULL)
				{
					Free(c->CipherName);
				}

				c->CipherName = NULL;

				if (c->SslVersion != NULL)
				{
					Free(c->SslVersion);
				}
				c->SslVersion = NULL;

				if (IsEmptyStr(tmp) == false)
				{
					c->CipherName = CopyStr(tmp);
					use_encrypt = true;
				}

				use_udp_acceleration_client = false;

				Format(radius_login_opt.In_VpnProtocolState, sizeof(radius_login_opt.In_VpnProtocolState),
					"L%u:%s", c->InProcLayer, c->InProcPrefix);
			}
			else
			{
				if (c->CipherName != NULL)
				{
					Free(c->CipherName);
				}
				c->CipherName = NULL;

				if (c->SslVersion != NULL)
				{
					Free(c->SslVersion);
				}
				c->SslVersion = NULL;

				if (c->FirstSock != NULL && IsEmptyStr(c->FirstSock->CipherName) == false)
				{
					c->CipherName = CopyStr(c->FirstSock->CipherName);
				}

				if (c->FirstSock != NULL && IsEmptyStr(c->FirstSock->SslVersion) == false)
				{
					c->SslVersion = CopyStr(c->FirstSock->SslVersion);
				}

				Format(radius_login_opt.In_VpnProtocolState, sizeof(radius_login_opt.In_VpnProtocolState),
					"L%u:%s", IPC_LAYER_2, "SEVPN");
			}

			if (support_bulk_on_rudp && c->FirstSock != NULL && c->FirstSock->IsRUDPSocket &&
				c->FirstSock->BulkRecvKey != NULL && c->FirstSock->BulkSendKey != NULL)
			{
				// Allow UDP bulk transfer if the client side supports
				// in the case of using R-UDP Socket
				enable_bulk_on_rudp = true;

				enable_hmac_on_bulk_of_rudp = support_hmac_on_bulk_of_rudp;
			}

			if (support_udp_recovery && c->FirstSock != NULL && c->FirstSock->IsRUDPSocket)
			{
				// Allow UDP recovery
				enable_udp_recovery = true;
			}

			if (use_udp_acceleration_client)
			{
				PackGetData2(p, "udp_acceleration_client_key", udp_acceleration_client_key, UDP_ACCELERATION_COMMON_KEY_SIZE_V1);
				PackGetData2(p, "udp_acceleration_client_key_v2", udp_acceleration_client_key_v2, UDP_ACCELERATION_COMMON_KEY_SIZE_V2);

				// Get the parameters for the UDP acceleration function
				if (PackGetIp(p, "udp_acceleration_client_ip", &udp_acceleration_client_ip) == false)
				{
					use_udp_acceleration_client = false;
				}
				else
				{
					if (IsZeroIp(&udp_acceleration_client_ip))
					{
						Copy(&udp_acceleration_client_ip, &c->FirstSock->RemoteIP, sizeof(IP));
					}
					udp_acceleration_client_port = PackGetInt(p, "udp_acceleration_client_port");
					if (udp_acceleration_client_port == 0)
					{
						use_udp_acceleration_client = false;
					}
				}

				use_hmac_on_udp_acceleration = support_hmac_on_udp_acceleration_client;
			}

			Debug("use_udp_acceleration_client = %u\n", use_udp_acceleration_client);
			Debug("use_hmac_on_udp_acceleration = %u\n", use_hmac_on_udp_acceleration);

			// Request mode
			require_bridge_routing_mode = PackGetBool(p, "require_bridge_routing_mode");
			require_monitor_mode = PackGetBool(p, "require_monitor_mode");
			if (require_monitor_mode)
			{
				qos = false;
			}

			if (is_server_or_bridge)
			{
				require_bridge_routing_mode = true;
			}

			// Client unique ID
			Zero(unique, sizeof(unique));
			if (PackGetDataSize(p, "unique_id") == SHA1_SIZE)
			{
				PackGetData(p, "unique_id", unique);
			}

			if (1)
			{
				// Log
				char ip1[64], ip2[64], verstr[64];
				wchar_t *authtype_str = _UU("LH_AUTH_UNKNOWN");
				switch (authtype)
				{
				case CLIENT_AUTHTYPE_ANONYMOUS:
					authtype_str = _UU("LH_AUTH_ANONYMOUS");
					break;
				case CLIENT_AUTHTYPE_PASSWORD:
					authtype_str = _UU("LH_AUTH_PASSWORD");
					break;
				case CLIENT_AUTHTYPE_PLAIN_PASSWORD:
					authtype_str = _UU("LH_AUTH_PLAIN_PASSWORD");
					break;
				case CLIENT_AUTHTYPE_CERT:
					authtype_str = _UU("LH_AUTH_CERT");
					break;
				case AUTHTYPE_WIREGUARD_KEY:
					authtype_str = _UU("LH_AUTH_WIREGUARD_KEY");
					break;
				case AUTHTYPE_OPENVPN_CERT:
					authtype_str = _UU("LH_AUTH_OPENVPN_CERT");
					break;
				case AUTHTYPE_TICKET:
					authtype_str = _UU("LH_AUTH_TICKET");
					break;
				}
				IPToStr(ip1, sizeof(ip1), &c->FirstSock->RemoteIP);
				IPToStr(ip2, sizeof(ip2), &c->FirstSock->LocalIP);

				Format(verstr, sizeof(verstr), "%u.%02u", c->ClientVer / 100, c->ClientVer % 100);

				HLog(hub, "LH_CONNECT_CLIENT", c->Name, ip1, c->FirstSock->RemoteHostname, c->FirstSock->RemotePort,
					c->ClientStr, verstr, c->ClientBuild, authtype_str, username);
			}

			// Attempt an anonymous authentication first
			auth_ret = SamAuthUserByAnonymous(hub, username);
			if (auth_ret)
			{
				if (c->IsInProc)
				{
					IPC_MSCHAP_V2_AUTHINFO mschap;
					char password_tmp[MAX_SIZE];

					Zero(&mschap, sizeof(mschap));

					Zero(password_tmp, sizeof(password_tmp));
					PackGetStr(p, "plain_password", password_tmp, sizeof(password_tmp));

					if (ParseAndExtractMsChapV2InfoFromPassword(&mschap, password_tmp))
					{
						// Because the server don't know the NTLM hashed password, the bet to the possibility of
						// the same character to the user name and empty, search a password of different
						// versions of the upper and lower case characters in the case of anonymous authentication.
						// Returns the MS-CHAPv2 response by using the password if there is a match.
						// Fail the authentication if no match is found.
						// (Because, if return a false MS-CHAPv2 Response, PPP client cause an error)
						LIST *o = NewListFast(NULL);
						char tmp1[MAX_SIZE];
						char tmp2[MAX_SIZE];
						char tmp3[MAX_SIZE];
						char tmp4[MAX_SIZE];
						char *response_pw;
						char psk[MAX_SIZE];

						ParseNtUsername(mschap.MsChapV2_PPPUsername, tmp1, sizeof(tmp1), tmp2, sizeof(tmp2), false);
						ParseNtUsername(mschap.MsChapV2_PPPUsername, tmp3, sizeof(tmp3), tmp4, sizeof(tmp4), true);

						Add(o, "");
						Add(o, "-");
						Add(o, ".");
						Add(o, "*");
						Add(o, "?");
						Add(o, " ");
						Add(o, "p");
						Add(o, "guest");
						Add(o, "anony");
						Add(o, "anonymous");
						Add(o, "password");
						Add(o, "passwd");
						Add(o, "pass");
						Add(o, "pw");
						Add(o, mschap.MsChapV2_PPPUsername);
						Add(o, tmp1);
						Add(o, tmp2);
						Add(o, tmp3);
						Add(o, tmp4);

						Zero(psk, sizeof(psk));

						if (c->Cedar->Server != NULL)
						{
							SERVER *s = c->Cedar->Server;

							if (s->IPsecServer != NULL)
							{
								StrCpy(psk, sizeof(psk), s->IPsecServer->Services.IPsec_Secret);

								Add(o, psk);
							}
						}

						response_pw = MsChapV2DoBruteForce(&mschap, o);

						ReleaseList(o);

						if (response_pw != NULL)
						{
							UCHAR challenge8[8];
							UCHAR nt_hash[16];
							UCHAR nt_hash_hash[16];

							GenerateNtPasswordHash(nt_hash, response_pw);
							GenerateNtPasswordHashHash(nt_hash_hash, nt_hash);
							MsChapV2_GenerateChallenge8(challenge8, mschap.MsChapV2_ClientChallenge, mschap.MsChapV2_ServerChallenge,
								mschap.MsChapV2_PPPUsername);
							MsChapV2Server_GenerateResponse(mschap_v2_server_response_20, nt_hash_hash,
								mschap.MsChapV2_ClientResponse, challenge8);

							Free(response_pw);
						}
						else
						{
							auth_ret = false;
						}
					}
				}

				if (auth_ret)
				{
					is_empty_password = true;
				}
			}

			if (auth_ret == false)
			{
				// Attempt other authentication methods if anonymous authentication fails
				switch (authtype)
				{
				case CLIENT_AUTHTYPE_ANONYMOUS:
					// Anonymous authentication (this have been already attempted)
					break;

				case AUTHTYPE_TICKET:
					// Ticket authentication
					if (PackGetDataSize(p, "ticket") == SHA1_SIZE)
					{
						PackGetData(p, "ticket", ticket);

						auth_ret = SiCheckTicket(hub, ticket, username, sizeof(username), username_real, sizeof(username_real),
							&ticketed_policy, sessionname, sizeof(sessionname), groupname, sizeof(groupname));
					}
					break;

				case CLIENT_AUTHTYPE_PASSWORD:
					// Password authentication
					if (PackGetDataSize(p, "secure_password") == SHA1_SIZE)
					{
						POLICY *pol = NULL;
						UCHAR secure_password[SHA1_SIZE];
						Zero(secure_password, sizeof(secure_password));
						if (PackGetDataSize(p, "secure_password") == SHA1_SIZE)
						{
							PackGetData(p, "secure_password", secure_password);
						}
						auth_ret = SamAuthUserByPassword(hub, username, c->Random, secure_password, NULL, NULL, NULL);

						pol = SamGetUserPolicy(hub, username);
						if (pol != NULL)
						{
							no_save_password = pol->NoSavePassword;
							Free(pol);
						}

						if(auth_ret){
							// Check whether the password was empty
							UCHAR hashed_empty_password[SHA1_SIZE];
							UCHAR secure_empty_password[SHA1_SIZE];
							HashPassword(hashed_empty_password, username, "");
							SecurePassword(secure_empty_password, hashed_empty_password, c->Random);
							if(Cmp(secure_password, secure_empty_password, SHA1_SIZE)==0){
								is_empty_password = true;
							}
						}
					}
					break;

				case CLIENT_AUTHTYPE_PLAIN_PASSWORD:
					{
						POLICY *pol = NULL;

						// Plaintext password authentication
						Zero(plain_password, sizeof(plain_password));
						PackGetStr(p, "plain_password", plain_password, sizeof(plain_password));
						if (c->IsInProc == false && StartWith(plain_password, IPC_PASSWORD_MSCHAPV2_TAG))
						{
							// Do not allow the MS-CHAPv2 authentication other than IPC sessions
							Zero(plain_password, sizeof(plain_password));
						}

						if (auth_ret == false)
						{
							// Attempt a password authentication of normal user
							UCHAR secure_password[SHA1_SIZE];
							UCHAR hash_password[SHA1_SIZE];
							bool is_mschap = StartWith(plain_password, IPC_PASSWORD_MSCHAPV2_TAG);

							HashPassword(hash_password, username, plain_password);
							SecurePassword(secure_password, hash_password, c->Random);

							if (is_mschap == false)
							{
								auth_ret = SamAuthUserByPassword(hub, username, c->Random, secure_password, NULL, NULL, NULL);
							}
							else
							{
								auth_ret = SamAuthUserByPassword(hub, username, c->Random, secure_password,
									plain_password, mschap_v2_server_response_20, &ms_chap_error);
							}

							if (auth_ret && pol == NULL)
							{
								pol = SamGetUserPolicy(hub, username);
							}
						}

						if (auth_ret == false)
						{
							// Attempt external authentication registered users
							bool fail_ext_user_auth = false;
							if (GetGlobalServerFlag(GSF_DISABLE_RADIUS_AUTH) != 0)
							{
								fail_ext_user_auth = true;
							}

							if (fail_ext_user_auth == false)
							{
								auth_ret = SamAuthUserByPlainPassword(c, hub, username, plain_password, false, mschap_v2_server_response_20, &radius_login_opt);
							}

							if (auth_ret && pol == NULL)
							{
								pol = SamGetUserPolicy(hub, username);
							}
						}

						if (auth_ret == false)
						{
							// Attempt external authentication asterisk user
							bool b = false;
							bool fail_ext_user_auth = false;

							if (GetGlobalServerFlag(GSF_DISABLE_RADIUS_AUTH) != 0)
							{
								fail_ext_user_auth = true;
							}

							if (fail_ext_user_auth == false)
							{
								AcLock(hub);
								{
									b = AcIsUser(hub, "*");
								}
								AcUnlock(hub);

								// If there is asterisk user, log on as the user
								if (b)
								{
									auth_ret = SamAuthUserByPlainPassword(c, hub, username, plain_password, true, mschap_v2_server_response_20, &radius_login_opt);
									if (auth_ret && pol == NULL)
									{
										pol = SamGetUserPolicy(hub, "*");
									}
								}
							}
						}

						if (pol != NULL)
						{
							no_save_password = pol->NoSavePassword;
							Free(pol);
						}

						if(auth_ret){
							// Check whether the password was empty
							if(IsEmptyStr(plain_password)){
								is_empty_password = true;
							}
						}
					}
					break;

				case CLIENT_AUTHTYPE_CERT:
					if (GetGlobalServerFlag(GSF_DISABLE_CERT_AUTH) == 0)
					{
						// Certificate authentication
						cert_size = PackGetDataSize(p, "cert");
						if (cert_size >= 1 && cert_size <= 100000)
						{
							cert_buf = ZeroMalloc(cert_size);
							if (PackGetData(p, "cert", cert_buf))
							{
								UCHAR sign[4096 / 8];
								UINT sign_size = PackGetDataSize(p, "sign");
								if (sign_size <= sizeof(sign) && sign_size >= 1)
								{
									if (PackGetData(p, "sign", sign))
									{
										BUF *b = NewBuf();
										X *x;
										WriteBuf(b, cert_buf, cert_size);
										x = BufToX(b, false);
										if (x != NULL && x->is_compatible_bit &&
											sign_size == (x->bits / 8))
										{
											K *k = GetKFromX(x);
											// Verify the signature received from the client
											if (RsaVerifyEx(c->Random, SHA1_SIZE, sign, k, x->bits))
											{
												// Confirmed that the client has had this certificate
												// certainly because the signature matched.
												// Check whether the certificate is valid.
												auth_ret = SamAuthUserByCert(hub, username, x);
												if (auth_ret)
												{
													// Copy the certificate
													c->ClientX = CloneX(x);
												}
											}
											else
											{
												// Authentication failure
											}
											FreeK(k);
										}
										FreeX(x);
										FreeBuf(b);
									}
								}
							}
							Free(cert_buf);
						}
					}
					else
					{
						// Certificate authentication is not supported in the open source version
						HLog(hub, "LH_AUTH_CERT_NOT_SUPPORT_ON_OPEN_SOURCE", c->Name, username);
						Unlock(hub->lock);
						ReleaseHub(hub);
						FreePack(p);
						c->Err = ERR_AUTHTYPE_NOT_SUPPORTED;
						goto CLEANUP;
					}
					break;

				case AUTHTYPE_WIREGUARD_KEY:
					// We already retrieved the hubname and username associated with the key.
					// Now we only have to verify that the user effectively exists.
					if (c->IsInProc)
					{
						auth_ret = SamIsUser(hub, username);
					}
					else
					{
						// WireGuard public key authentication cannot be used directly by external clients.
						Unlock(hub->lock);
						ReleaseHub(hub);
						FreePack(p);
						c->Err = ERR_AUTHTYPE_NOT_SUPPORTED;
						goto CLEANUP;
					}
					break;

				case AUTHTYPE_OPENVPN_CERT:
					// For OpenVPN; mostly same as CLIENT_AUTHTYPE_CERT, but without
					// signature verification, because it was already performed during TLS handshake.
					if (c->IsInProc)
					{
						// Certificate authentication
						cert_size = PackGetDataSize(p, "cert");
						if (cert_size >= 1 && cert_size <= 100000)
						{
							cert_buf = ZeroMalloc(cert_size);
							if (PackGetData(p, "cert", cert_buf))
							{
								BUF *b = NewBuf();
								X *x;
								WriteBuf(b, cert_buf, cert_size);
								x = BufToX(b, false);
								if (x != NULL && x->is_compatible_bit)
								{
									Debug("Got to SamAuthUserByCert %s\n", username); // XXX
									// Check whether the certificate is valid.
									auth_ret = SamAuthUserByCert(hub, username, x);
									if (auth_ret)
									{
										// Copy the certificate
										c->ClientX = CloneX(x);
									}
								}
								FreeX(x);
								FreeBuf(b);
							}
							Free(cert_buf);
						}
					}
					else
					{
						// OpenVPN certificate authentication cannot be used directly by external clients
						Unlock(hub->lock);
						ReleaseHub(hub);
						FreePack(p);
						c->Err = ERR_AUTHTYPE_NOT_SUPPORTED;
						goto CLEANUP;
					}
					break;

				default:
					// Unknown authentication method
					Unlock(hub->lock);
					ReleaseHub(hub);
					FreePack(p);
					c->Err = ERR_AUTHTYPE_NOT_SUPPORTED;
					error_detail = "ERR_AUTHTYPE_NOT_SUPPORTED";
					goto CLEANUP;
				}
			}

			if (auth_ret == false)
			{
				char ip[64];
				IPToStr(ip, sizeof(ip), &c->FirstSock->RemoteIP);
				HLog(hub, "LH_AUTH_NG", c->Name, username, ip);

				Unlock(hub->lock);
				ReleaseHub(hub);
				FreePack(p);
				c->Err = ERR_AUTH_FAILED;
				if (ms_chap_error != 0)
				{
					c->Err = ms_chap_error;
				}
				error_detail = "ERR_AUTH_FAILED";
				goto CLEANUP;
			}
			else
			{
				if (is_empty_password)
				{
					const SOCK *s = c->FirstSock;
					if (s != NULL && IsLocalHostIP(&s->RemoteIP) == false)
					{
						if (StrCmpi(username, ADMINISTRATOR_USERNAME) == 0 || GetHubAdminOption(hub, "deny_empty_password") != 0)
						{
							// When the password is empty, remote connection is not acceptable
							HLog(hub, "LH_LOCAL_ONLY", c->Name, username);

							Unlock(hub->lock);
							ReleaseHub(hub);
							FreePack(p);
							c->Err = ERR_NULL_PASSWORD_LOCAL_ONLY;
							error_detail = "ERR_NULL_PASSWORD_LOCAL_ONLY";
							goto CLEANUP;
						}
					}
				}

				HLog(hub, "LH_AUTH_OK", c->Name, username);
			}

			policy = NULL;

			// Authentication success
			FreePack(p);

			// Check the assigned VLAN ID
			if (radius_login_opt.Out_IsRadiusLogin)
			{
				if (radius_login_opt.In_CheckVLanId)
				{
					if (radius_login_opt.Out_VLanId != 0)
					{
						assigned_vlan_id = radius_login_opt.Out_VLanId;
					}

					if (radius_login_opt.In_DenyNoVlanId && assigned_vlan_id == 0 || assigned_vlan_id >= 4096)
					{
						// Deny this session
						Unlock(hub->lock);
						ReleaseHub(hub);
						c->Err = ERR_ACCESS_DENIED;
						error_detail = "In_DenyNoVlanId";
						goto CLEANUP;
					}
				}
			}

			// Check the assigned MAC Address
			if (radius_login_opt.Out_IsRadiusLogin)
			{
				Copy(assigned_ipc_mac_address, radius_login_opt.Out_VirtualMacAddress, 6);
			}

			if (StrCmpi(username, ADMINISTRATOR_USERNAME) != 0)
			{
				// Get the policy
				if (farm_member == false)
				{
					bool is_asterisk_user = false;

					// In the case of not a farm member
					user = AcGetUser(hub, username);
					if (user == NULL)
					{
						user = AcGetUser(hub, "*");
						if (user == NULL)
						{
							// User acquisition failure
							Unlock(hub->lock);
							ReleaseHub(hub);
							c->Err = ERR_ACCESS_DENIED;
							error_detail = "AcGetUser";
							goto CLEANUP;
						}

						is_asterisk_user = true;
					}

					policy = NULL;

					Lock(user->lock);
					{
						if (is_asterisk_user == false)
						{
							UCHAR associated_mac_address[6];

							// Get the associated virtual MAC address
							if (GetUserMacAddressFromUserNote(associated_mac_address, user->Note))
							{
								if (IsZero(assigned_ipc_mac_address, 6))
								{
									WHERE;
									Copy(assigned_ipc_mac_address, associated_mac_address, 6);
								}
							}
						}

						// Get the expiration date
						user_expires = user->ExpireTime;

						StrCpy(username_real, sizeof(username_real), user->Name);
						group = user->Group;
						if (group != NULL)
						{
							AddRef(group->ref);

							Lock(group->lock);
							{
								// Get the group name
								StrCpy(groupname, sizeof(groupname), group->Name);
							}
							Unlock(group->lock);
						}

						if (user->Policy != NULL)
						{
							policy = ClonePolicy(user->Policy);
						}
						else
						{
							if (group)
							{
								Lock(group->lock);
								{
									if (group->Policy != NULL)
									{
										policy = ClonePolicy(group->Policy);
									}
								}
								Unlock(group->lock);
							}
						}

						if (group != NULL)
						{
							ReleaseGroup(group);
						}
					}
					Unlock(user->lock);
					loggedin_user_object = user;
				}
				else
				{
					// In the case of farm member
					policy = ClonePolicy(&ticketed_policy);
				}
			}
			else
			{
				// Administrator mode
				admin_mode = true;
				StrCpy(username_real, sizeof(username_real), ADMINISTRATOR_USERNAME);

				policy = ClonePolicy(GetDefaultPolicy());
				policy->NoBroadcastLimiter = true;
				policy->MonitorPort = true;
			}

			if (policy == NULL)
			{
				// Use the default policy
				policy = ClonePolicy(GetDefaultPolicy());
			}

			if (policy->MaxConnection == 0)
			{
				policy->MaxConnection = MAX_TCP_CONNECTION;
			}

			if (policy->TimeOut == 0)
			{
				policy->TimeOut = 20;
			}

			if (qos)
			{
				// VoIP / QoS
				if (policy->NoQoS)
				{
					// Policy does not allow QoS
					qos = false;
				}
				if (GetServerCapsBool(c->Cedar->Server, "b_support_qos") == false)
				{
					// Server does not support QoS
					qos = false;
					policy->NoQoS = true;
				}
				if (GetHubAdminOption(hub, "deny_qos") != 0)
				{
					// It is prohibited in the management options
					qos = false;
					policy->NoQoS = true;
				}
			}

			if (GetHubAdminOption(hub, "max_bitrates_download") != 0)
			{
				if (policy->MaxDownload == 0)
				{
					policy->MaxDownload = GetHubAdminOption(hub, "max_bitrates_download");
				}
				else
				{
					UINT r = GetHubAdminOption(hub, "max_bitrates_download");
					policy->MaxDownload = MIN(policy->MaxDownload, r);
				}
			}

			if (GetHubAdminOption(hub, "max_bitrates_upload") != 0)
			{
				if (policy->MaxUpload == 0)
				{
					policy->MaxUpload = GetHubAdminOption(hub, "max_bitrates_upload");
				}
				else
				{
					UINT r = GetHubAdminOption(hub, "max_bitrates_upload");
					policy->MaxUpload = MIN(policy->MaxUpload, r);
				}
			}

			if (GetHubAdminOption(hub, "deny_bridge") != 0)
			{
				policy->NoBridge = true;
			}

			if (GetHubAdminOption(hub, "deny_routing") != 0)
			{
				policy->NoRouting = true;
			}

			if (c->IsInProc)
			{
				policy->NoBridge = false;
				policy->NoRouting = false;
			}

			if (hub->Option->ClientMinimumRequiredBuild > c->ClientBuild &&
				 InStrEx(c->ClientStr, "client", false))
			{
				// Build number of the client is too small
				HLog(hub, "LH_CLIENT_VERSION_OLD", c->Name, c->ClientBuild, hub->Option->ClientMinimumRequiredBuild);

				Unlock(hub->lock);
				ReleaseHub(hub);
				c->Err = ERR_VERSION_INVALID;
				Free(policy);
				error_detail = "ERR_VERSION_INVALID";
				goto CLEANUP;
			}

			if (hub->Option->RequiredClientId != 0 &&
				hub->Option->RequiredClientId != client_id && 
				InStrEx(c->ClientStr, "client", false))
			{
				// Build number of the client is too small
				HLog(hub, "LH_CLIENT_ID_REQUIRED", c->Name, client_id, hub->Option->RequiredClientId);

				Unlock(hub->lock);
				ReleaseHub(hub);
				c->Err = ERR_CLIENT_ID_REQUIRED;
				error_detail = "ERR_CLIENT_ID_REQUIRED";
				Free(policy);
				goto CLEANUP;
			}

			if (user_expires != 0 && user_expires <= SystemTime64())
			{
				// User expired
				HLog(hub, "LH_USER_EXPIRES", c->Name, username);

				Unlock(hub->lock);
				ReleaseHub(hub);
				c->Err = ERR_ACCESS_DENIED;
				error_detail = "LH_USER_EXPIRES";
				Free(policy);
				goto CLEANUP;
			}

			if (policy->Access == false)
			{
				// Access is denied
				HLog(hub, "LH_POLICY_ACCESS_NG", c->Name, username);

				Unlock(hub->lock);
				ReleaseHub(hub);
				error_detail = "LH_POLICY_ACCESS_NG";
				c->Err = ERR_ACCESS_DENIED;
				Free(policy);
				goto CLEANUP;
			}

			// Determine the contents of the policy by comparing to
			// option presented by client or deny the connection.
			// Confirm the connectivity in the monitor-mode first
			if (require_monitor_mode && policy->MonitorPort == false)
			{
				// Can not connect in the monitor port mode
				HLog(hub, "LH_POLICY_MONITOR_MODE", c->Name);

				Unlock(hub->lock);
				ReleaseHub(hub);
				c->Err = ERR_MONITOR_MODE_DENIED;
				Free(policy);
				error_detail = "ERR_MONITOR_MODE_DENIED";
				goto CLEANUP;
			}

			if (policy->MonitorPort)
			{
				if (require_monitor_mode == false)
				{
					policy->MonitorPort = false;
				}
			}

			if (policy->MonitorPort)
			{
				qos = false;
			}

			// Determine whether it can be connected by a bridge / routing mode next
			if (require_bridge_routing_mode &&
				(policy->NoBridge && policy->NoRouting))
			{
				// Can not be connected by a bridge / routing mode
				HLog(hub, "LH_POLICY_BRIDGE_MODE", c->Name);

				Unlock(hub->lock);
				ReleaseHub(hub);
				c->Err = ERR_BRIDGE_MODE_DENIED;
				error_detail = "ERR_BRIDGE_MODE_DENIED";
				Free(policy);
				goto CLEANUP;
			}

			if (require_bridge_routing_mode == false)
			{
				policy->NoBridge = true;
				policy->NoRouting = true;
			}

			if (Cmp(unique, unique2, SHA1_SIZE) == 0)
			{
				// It's a localhost session
				local_host_session = true;
			}

			if (local_host_session == false)
			{
				// Make further judgment whether localhost session
				SOCK *s = c->FirstSock;

				if (s != NULL)
				{
					if (IsIPMyHost(&s->RemoteIP))
					{
						// It's a localhost session
						local_host_session = true;
					}
				}
			}

			if (local_host_session)
			{
				// Permit routing or bridging in the case of localhost session
				policy->NoBridge = false;
				policy->NoRouting = false;
			}

			if (local_host_session == false)
			{

				if (policy->NoBridge == false || policy->NoRouting == false)
				{
					use_bridge_license = true;
				}
				else
				{
					use_client_license = true;
				}
			}


			if (server != NULL && server->ServerType != SERVER_TYPE_FARM_MEMBER &&
				policy != NULL)
			{
				if (GetServerCapsBool(hub->Cedar->Server, "b_support_limit_multilogin"))
				{
					// Check if the number of concurrent multiple logins limit is specified in the policy
					RPC_ENUM_SESSION t;
					UINT i, num;
					UINT max_logins = policy->MultiLogins;
					UINT ao = GetHubAdminOption(hub, "max_multilogins_per_user");

					if (ao != 0)
					{
						if (max_logins != 0)
						{
							max_logins = MIN(max_logins, ao);
						}
						else
						{
							max_logins = ao;
						}
					}

					if (max_logins != 0)
					{
						Zero(&t, sizeof(t));
						StrCpy(t.HubName, sizeof(t.HubName), hub->Name);

						Unlock(hub->lock);

						SiEnumSessionMain(server, &t);

						Lock(hub->lock);

						num = 0;

						for (i = 0;i < t.NumSession;i++)
						{
							RPC_ENUM_SESSION_ITEM *e = &t.Sessions[i];

							if (e->BridgeMode == false && e->Layer3Mode == false && e->LinkMode == false && e->CurrentNumTcp != 0)
							{
								if (StrCmpi(e->Username, username) == 0 &&
									(IsZero(e->UniqueId, 16) || Cmp(e->UniqueId, node.UniqueId, 16) != 0))
								{
									num++;
								}
							}
						}

						FreeRpcEnumSession(&t);

						if (num >= max_logins)
						{
							// Can not connect any more
							Unlock(hub->lock);

							// Dump a detailed error log
							HLog(hub, "LH_TOO_MANY_MULTILOGINS",
								c->Name,
								username, max_logins, num);

							ReleaseHub(hub);
							c->Err = ERR_TOO_MANY_USER_SESSION;
							Free(policy);
							goto CLEANUP;
						}
					}
				}
			}

			if (loggedin_user_object != NULL)
			{
				// Update the user information
				Lock(loggedin_user_object->lock);
				{
					loggedin_user_object->LastLoginTime = SystemTime64();
				}
				Unlock(loggedin_user_object->lock);
			}

			// Update the number of log-ins
			hub->LastCommTime = hub->LastLoginTime = SystemTime64();

			if (farm_controller)
			{
				wchar_t *msg = GetHubMsg(hub);

				Unlock(hub->lock);

				Lock(cedar->CedarSuperLock);

				// In the case of farm controller, choose a farm members to host this HUB
				LockList(server->FarmMemberList);
				{
					HLog(hub, "LH_FARM_SELECT_1", c->Name);
					f = SiGetHubHostingMember(server, hub, admin_mode, c);

					if (f == NULL)
					{
						// Failed in the selection
						HLog(hub, "LH_FARM_SELECT_2", c->Name);
						UnlockList(server->FarmMemberList);
						Unlock(cedar->CedarSuperLock);
						ReleaseHub(hub);
						c->Err = ERR_COULD_NOT_HOST_HUB_ON_FARM;
						Free(policy);
						Free(msg);
						goto CLEANUP;
					}
					else
					{
						if (f->Me == false)
						{
							UCHAR ticket[SHA1_SIZE];
							PACK *p;
							BUF *b;
							UINT i;

							SLog(c->Cedar, "LH_FARM_SELECT_4", c->Name, f->hostname);

							// Create a session on the selected server farm member
							Rand(ticket, sizeof(ticket));
							SiCallCreateTicket(server, f, hub->Name,
								username, username_real, policy, ticket, Inc(hub->SessionCounter), groupname);

							p = NewPack();
							PackAddInt(p, "Redirect", 1);
							PackAddIp32(p, "Ip", f->Ip);
							for (i = 0;i < f->NumPort;i++)
							{
								PackAddIntEx(p, "Port", f->Ports[i], i, f->NumPort);
							}
							PackAddData(p, "Ticket", ticket, sizeof(ticket));

							if (true)
							{
								char *utf = CopyUniToUtf(msg);

								PackAddData(p, "Msg", utf, StrLen(utf));

								Free(utf);
							}

							b = XToBuf(f->ServerCert, false);
							PackAddBuf(p, "Cert", b);
							FreeBuf(b);

							UnlockList(server->FarmMemberList);
							Unlock(cedar->CedarSuperLock);
							ReleaseHub(hub);

							HttpServerSend(c->FirstSock, p);
							FreePack(p);

							c->Err = 0;
							Free(policy);

							FreePack(HttpServerRecv(c->FirstSock));
							Free(msg);
							goto CLEANUP;
						}
						else
						{
							HLog(hub, "LH_FARM_SELECT_3", c->Name);
							// Continue the process because myself was selected
							UnlockList(server->FarmMemberList);
							Unlock(cedar->CedarSuperLock);
							f->Point = SiGetPoint(server);
							Lock(hub->lock);
							Free(msg);
						}
					}
				}
			}

			if (admin_mode == false)
			{
				// Check the maximum number of connections of the HUB
				if (hub->Option->MaxSession != 0 &&
					hub->Option->MaxSession <= Count(hub->NumSessions))
				{
					// Can not connect any more
					Unlock(hub->lock);

					HLog(hub, "LH_MAX_SESSION", c->Name, hub->Option->MaxSession);

					ReleaseHub(hub);
					c->Err = ERR_HUB_IS_BUSY;
					Free(policy);
					error_detail = "ERR_HUB_IS_BUSY";
					goto CLEANUP;
				}
			}

			if (use_encrypt == false && c->FirstSock->IsReverseAcceptedSocket)
			{
				// On VPN Azure, SSL encryption is mandated.
				use_encrypt = true;
			}

			if (use_client_license || use_bridge_license)
			{
				// Examine whether not to conflict with the limit of simultaneous connections
				// number of sessions defined by the Virtual HUB management options
				if (
					(GetHubAdminOption(hub, "max_sessions") != 0 &&
					(Count(hub->NumSessionsClient) + Count(hub->NumSessionsBridge)) >= GetHubAdminOption(hub, "max_sessions"))
					||
					(hub->Option->MaxSession != 0 &&
					(Count(hub->NumSessionsClient) + Count(hub->NumSessionsBridge)) >= hub->Option->MaxSession))
				{
					// Can not connect any more
					Unlock(hub->lock);

					HLog(hub, "LH_MAX_SESSION", c->Name, GetHubAdminOption(hub, "max_sessions"));

					ReleaseHub(hub);
					c->Err = ERR_HUB_IS_BUSY;
					Free(policy);
					goto CLEANUP;
				}
			}

			if (use_client_license)
			{
				// Examine whether not to conflict with the limit of simultaneous connections
				// number of sessions(client) defined by the Virtual HUB management options
				if (((GetHubAdminOption(hub, "max_sessions_client_bridge_apply") != 0
					) &&
					Count(hub->NumSessionsClient) >= GetHubAdminOption(hub, "max_sessions_client") && hub->Cedar->Server != NULL && hub->Cedar->Server->ServerType != SERVER_TYPE_FARM_MEMBER)
					||
					(hub->FarmMember_MaxSessionClientBridgeApply &&
					Count(hub->NumSessionsClient) >= hub->FarmMember_MaxSessionClient))
				{
					// Can not connect any more
					Unlock(hub->lock);

					HLog(hub, "LH_MAX_SESSION_CLIENT", c->Name, GetHubAdminOption(hub, "max_sessions_client"));

					ReleaseHub(hub);
					c->Err = ERR_HUB_IS_BUSY;
					Free(policy);
					goto CLEANUP;
				}
			}

			if (use_bridge_license)
			{
				// Examine whether not to conflict with the limit of simultaneous connections
				// number of sessions(bridge) defined by the Virtual HUB management options
				if (((GetHubAdminOption(hub, "max_sessions_client_bridge_apply") != 0
					) &&
					Count(hub->NumSessionsBridge) >= GetHubAdminOption(hub, "max_sessions_bridge") && hub->Cedar->Server != NULL && hub->Cedar->Server->ServerType != SERVER_TYPE_FARM_MEMBER)
					||
					(hub->FarmMember_MaxSessionClientBridgeApply &&
					Count(hub->NumSessionsBridge) >= hub->FarmMember_MaxSessionBridge))
				{
					// Can not connect any more
					Unlock(hub->lock);

					HLog(hub, "LH_MAX_SESSION_BRIDGE", c->Name, GetHubAdminOption(hub, "max_sessions_bridge"));

					ReleaseHub(hub);
					c->Err = ERR_HUB_IS_BUSY;
					Free(policy);
					goto CLEANUP;
				}
			}

			if (Count(hub->Cedar->CurrentSessions) >= GetServerCapsInt(hub->Cedar->Server, "i_max_sessions"))
			{
				// Can not connect any more
				Unlock(hub->lock);

				HLog(hub, "LH_MAX_SESSION_2", c->Name, GetServerCapsInt(hub->Cedar->Server, "i_max_sessions"));

				ReleaseHub(hub);
				c->Err = ERR_HUB_IS_BUSY;
				Free(policy);
				goto CLEANUP;
			}

			// Increment the current number of connections
			Inc(hub->NumSessions);
			if (use_bridge_license)
			{
				Inc(hub->NumSessionsBridge);
			}

			if (use_client_license)
			{
				Inc(hub->NumSessionsClient);
			}
			Inc(hub->Cedar->CurrentSessions);

			// Calculate the time-out period
			timeout = policy->TimeOut * 1000;	// Convert milliseconds to seconds
			if (timeout == 0)
			{
				timeout = TIMEOUT_DEFAULT;
			}
			timeout = MIN(timeout, TIMEOUT_MAX);
			timeout = MAX(timeout, TIMEOUT_MIN);

			// Update the max_connection according to the policy
			max_connection = MIN(max_connection, policy->MaxConnection);
			max_connection = MIN(max_connection, MAX_TCP_CONNECTION);
			max_connection = MAX(max_connection, 1);

			if (c->FirstSock->IsRUDPSocket)
			{
				// In the case of TCP-over-UDP
				half_connection = false;

				// Disable the QoS
				qos = false;

				if (enable_udp_recovery == false)
				{
					// Disable the session reconnection feature
					no_reconnect_to_session = true;
					max_connection = 1;
				}
				else
				{
					// If the UDP recovery is enabled, permit the session re-connection feature (for 2)
					no_reconnect_to_session = false;
					max_connection = NUM_TCP_CONNECTION_FOR_UDP_RECOVERY;
				}
			}

			if (half_connection)
			{
				// Number of connections should be more than 2 in the case of Half Connection
				max_connection = MAX(max_connection, 2);
			}

			if (qos)
			{
				// Number of connections is set to 2 or more when using the VoIP / QoS
				max_connection = MAX(max_connection, 2);
				if (half_connection)
				{
					max_connection = MAX(max_connection, 4);
				}
			}

			c->Status = CONNECTION_STATUS_ESTABLISHED;

			// Remove the connection from Cedar
			DelConnection(c->Cedar, c);

			// VLAN ID
			if (assigned_vlan_id != 0)
			{
				if (policy->VLanId == 0)
				{
					policy->VLanId = assigned_vlan_id;
				}
			}

			// Create a Session
			StrLower(username);
			s = NewServerSessionEx(c->Cedar, c, hub, username, policy, c->IsInProc,
				(c->IsInProc && IsZero(assigned_ipc_mac_address, 6) == false) ? assigned_ipc_mac_address : NULL);

			s->EnableUdpRecovery = enable_udp_recovery;
			s->LocalHostSession = local_host_session;
			s->NormalClient = true;

			IPToStr(s->ClientIP, sizeof(s->ClientIP), &c->ClientIp);

			if (c->FirstSock->IsRUDPSocket)
			{
				// R-UDP session
				s->IsRUDPSession = true;
				s->RUdpMss = c->FirstSock->RUDP_OptimizedMss;
				Debug("ServerAccept(): Optimized MSS Value for R-UDP: %u\n", s->RUdpMss);
				AddProtocolDetailsKeyValueInt(s->ProtocolDetails, sizeof(s->ProtocolDetails), "RUDP_MSS", s->RUdpMss);
			}

			if (enable_bulk_on_rudp)
			{
				// Allow bulk transfer on R-UDP
				s->EnableBulkOnRUDP = true;
				s->EnableHMacOnBulkOfRUDP = enable_hmac_on_bulk_of_rudp;
			}

			s->IsAzureSession = c->FirstSock->IsReverseAcceptedSocket;

			StrCpy(s->UnderlayProtocol, sizeof(s->UnderlayProtocol), c->FirstSock->UnderlayProtocol);

			AddProtocolDetailsStr(s->ProtocolDetails, sizeof(s->ProtocolDetails), c->FirstSock->ProtocolDetails);

			if (server != NULL)
			{
				s->NoSendSignature = server->NoSendSignature;
			}

			if (c->IsInProc)
			{
				s->NoSendSignature = true;
			}

			if (c->IsInProc && StrCmpi(c->InProcPrefix, OPENVPN_IPC_POSTFIX_L3) == 0)
			{
				// OpenVPN L3 session
				s->IsOpenVPNL3Session = true;
			}

			if (c->IsInProc && StrCmpi(c->InProcPrefix, OPENVPN_IPC_POSTFIX_L2) == 0)
			{
				// OpenVPN L2 session
				s->IsOpenVPNL2Session = true;
			}

			// Determine whether the use of UDP acceleration mode
			if (use_udp_acceleration_client)
			{
				s->UseUdpAcceleration = true;

				s->UdpAccelFastDisconnectDetect = support_udp_accel_fast_disconnect_detect;

				udp_acceleration_version = 1;
				if (client_udp_acceleration_max_version >= 2)
				{
					udp_acceleration_version = 2;
				}
			}

			if (client_rudp_bulk_max_version >= 2)
			{
				rudp_bulk_version = 2;
			}

			s->BulkOnRUDPVersion = rudp_bulk_version;

			if (s->EnableBulkOnRUDP)
			{
				AddProtocolDetailsKeyValueInt(s->ProtocolDetails, sizeof(s->ProtocolDetails), "RUDP_Bulk_Ver", s->BulkOnRUDPVersion);
			}

			if (hub->Option != NULL && hub->Option->DisableUdpAcceleration)
			{
				s->UseUdpAcceleration = false;
			}

			if (IsZeroIP(&c->FirstSock->Reverse_MyServerGlobalIp) == false &&
				CmpIpAddr(&c->FirstSock->Reverse_MyServerGlobalIp, &c->FirstSock->RemoteIP) == 0)
			{
				// Disable forcibly the UDP acceleration mode if VPN Server and VPN Client
				// are in same LAN in the case of using VPN Azure.
				// (Or this may cause infinite loop of packet)
				s->UseUdpAcceleration = false;
			}

			if (s->UseUdpAcceleration)
			{
				s->UseHMacOnUdpAcceleration = use_hmac_on_udp_acceleration;
			}

			Debug("UseUdpAcceleration = %u\n", s->UseUdpAcceleration);
			Debug("UseHMacOnUdpAcceleration = %u\n", s->UseHMacOnUdpAcceleration);
			Debug("UdpAccelerationVersion = %u\n", s->UdpAccelerationVersion);

			if (s->UseUdpAcceleration)
			{
				bool no_nat_t = false;


				// Initialize the UDP acceleration function
				s->UdpAccel = NewUdpAccel(c->Cedar, (c->FirstSock->IsRUDPSocket ? NULL : &c->FirstSock->LocalIP), false, c->FirstSock->IsRUDPSocket, no_nat_t);
				if (s->UdpAccel == NULL)
				{
					s->UseUdpAcceleration = false;
					Debug("NewUdpAccel Failed.\n");
				}
				else
				{
					s->UdpAccel->Version = udp_acceleration_version;

					if (UdpAccelInitServer(s->UdpAccel,
						s->UdpAccel->Version == 2 ? udp_acceleration_client_key_v2 : udp_acceleration_client_key,
						&c->FirstSock->RemoteIP, &udp_acceleration_client_ip, udp_acceleration_client_port) == false)
					{
						Debug("UdpAccelInitServer Failed.\n");
						s->UseUdpAcceleration = false;
					}

					s->UdpAccel->FastDetect = s->UdpAccelFastDisconnectDetect;

					if (use_encrypt == false)
					{
						s->UdpAccel->PlainTextMode = true;
					}

					s->UdpAccel->UseHMac = s->UseHMacOnUdpAcceleration;

					AddProtocolDetailsKeyValueInt(s->ProtocolDetails, sizeof(s->ProtocolDetails), "UDPAccel_Ver", s->UdpAccel->Version);

					AddProtocolDetailsStr(s->ProtocolDetails, sizeof(s->ProtocolDetails), s->UdpAccel->Version > 1 ? "ChaCha20-Poly1305" : "RC4");

					AddProtocolDetailsKeyValueInt(s->ProtocolDetails, sizeof(s->ProtocolDetails), "UDPAccel_MSS", UdpAccelCalcMss(s->UdpAccel));
				}
			}

			s->UseClientLicense = use_client_license;
			s->UseBridgeLicense = use_bridge_license;

			s->AdjustMss = adjust_mss;
			if (s->AdjustMss != 0)
			{
				Debug("AdjustMSS: %u\n", s->AdjustMss);
				AddProtocolDetailsKeyValueInt(s->ProtocolDetails, sizeof(s->ProtocolDetails), "AdjustMSS", s->AdjustMss);
			}

			s->IsBridgeMode = (policy->NoBridge == false) || (policy->NoRouting == false);
			s->IsMonitorMode = policy->MonitorPort;

			// Decide whether IPv6 session
			s->IPv6Session = false;

			if (node.ClientIpAddress == 0)
			{
				s->IPv6Session = true;
			}

			if (use_bridge_license)
			{
				Inc(s->Cedar->AssignedBridgeLicense);
			}

			if (use_client_license)
			{
				Inc(s->Cedar->AssignedClientLicense);
			}

			if (server != NULL)
			{
				// Update the total allocation of the number of licenses for Server structure
				if (server->ServerType == SERVER_TYPE_STANDALONE)
				{
					// Update only stand-alone mode
					// (Periodically poll in the cluster controller mode)
					server->CurrentAssignedClientLicense = Count(s->Cedar->AssignedClientLicense);
					server->CurrentAssignedBridgeLicense = Count(s->Cedar->AssignedBridgeLicense);
				}
			}

			if (StrLen(sessionname) != 0)
			{
				// Specify the session name
				Free(s->Name);
				s->Name = CopyStr(sessionname);
			}

			{
				char ip[128];
				IPToStr(ip, sizeof(ip), &c->FirstSock->RemoteIP);
				HLog(hub, "LH_NEW_SESSION", c->Name, s->Name, ip, c->FirstSock->RemotePort, c->FirstSock->UnderlayProtocol, c->FirstSock->ProtocolDetails);
			}

			c->Session = s;
			s->AdministratorMode = admin_mode;
			StrCpy(s->UserNameReal, sizeof(s->UserNameReal), username_real);
			StrCpy(s->GroupName, sizeof(s->GroupName), groupname);

			// Get the session key
			Copy(session_key, s->SessionKey, SHA1_SIZE);

			// Set the parameters
			s->MaxConnection = max_connection;
			s->UseEncrypt = use_encrypt;
			s->UseCompress = use_compress;
			s->HalfConnection = half_connection;
			s->Timeout = timeout;
			s->QoS = qos;
			s->NoReconnectToSession = no_reconnect_to_session;
			s->VLanId = policy->VLanId;

			// User name
			s->Username = CopyStr(username);

			HLog(hub, "LH_SET_SESSION", s->Name, s->MaxConnection,
				s->UseEncrypt ? _UU("L_YES") : _UU("L_NO"),
				s->UseCompress ? _UU("L_YES") : _UU("L_NO"),
				s->HalfConnection ? _UU("L_YES") : _UU("L_NO"),
				s->Timeout / 1000);

			msg = GetHubMsg(hub);

			// Suppress client update notification flag
			if (hub->Option != NULL)
			{
				suppress_client_update_notification = hub->Option->SuppressClientUpdateNotification;
			}
		}
		Unlock(hub->lock);

		// Send a Welcome packet to the client
		p = PackWelcome(s);

		PackAddBool(p, "suppress_client_update_notification", suppress_client_update_notification);

		if (s != NULL && s->InProcMode)
		{
			if (IsZero(mschap_v2_server_response_20, sizeof(mschap_v2_server_response_20)) == false)
			{
				// MS-CHAPv2 Response
				PackAddData(p, "IpcMsChapV2ServerResponse", mschap_v2_server_response_20, sizeof(mschap_v2_server_response_20));
			}
		}

		if (true)
		{
			// A message to be displayed in the VPN Client (Will not be displayed if the VPN Gate Virtual HUB)
			char *utf;
			wchar_t winver_msg_client[3800];
			wchar_t winver_msg_server[3800];
			UINT tmpsize;
			wchar_t *tmp;
			RPC_WINVER server_winver;

			GetWinVer(&server_winver);

			Zero(winver_msg_client, sizeof(winver_msg_client));
			Zero(winver_msg_server, sizeof(winver_msg_server));

			if (IsSupportedWinVer(&winver) == false)
			{
				SYSTEMTIME st;

				LocalTime(&st);

				UniFormat(winver_msg_client, sizeof(winver_msg_client), _UU("WINVER_ERROR_FORMAT"),
					_UU("WINVER_ERROR_PC_LOCAL"),
					winver.Title,
					_UU("WINVER_ERROR_VPNSERVER"),
					SUPPORTED_WINDOWS_LIST,
					_UU("WINVER_ERROR_PC_LOCAL"),
					_UU("WINVER_ERROR_VPNSERVER"),
					_UU("WINVER_ERROR_VPNSERVER"),
					_UU("WINVER_ERROR_VPNSERVER"),
					st.wYear, st.wMonth);
			}

			if (IsSupportedWinVer(&server_winver) == false)
			{
				SYSTEMTIME st;

				LocalTime(&st);

				UniFormat(winver_msg_server, sizeof(winver_msg_server), _UU("WINVER_ERROR_FORMAT"),
					_UU("WINVER_ERROR_PC_REMOTE"),
					server_winver.Title,
					_UU("WINVER_ERROR_VPNSERVER"),
					SUPPORTED_WINDOWS_LIST,
					_UU("WINVER_ERROR_PC_REMOTE"),
					_UU("WINVER_ERROR_VPNSERVER"),
					_UU("WINVER_ERROR_VPNSERVER"),
					_UU("WINVER_ERROR_VPNSERVER"),
					st.wYear, st.wMonth);
			}

			tmpsize = UniStrSize(winver_msg_client) + UniStrSize(winver_msg_server) + UniStrSize(msg) + (16000 + 3000) * sizeof(wchar_t);

			tmp = ZeroMalloc(tmpsize);

			if (IsURLMsg(msg, NULL, 0) == false)
			{

				if (s != NULL && s->IsRUDPSession && c != NULL)
				{
					// Show the warning message if the connection is made by NAT-T
					wchar_t *tmp2;
					UINT tmp2_size = 2400 * sizeof(wchar_t);
					char local_name[128];
					wchar_t local_name_2[128];
					char local_name_3[128];

					Zero(local_name, sizeof(local_name));
					Zero(local_name_2, sizeof(local_name_2));
					Zero(local_name_3, sizeof(local_name_3));

					GetMachineName(local_name, sizeof(local_name));

#ifdef	OS_WIN32
					MsGetComputerNameFullEx(local_name_2, sizeof(local_name_2), true);

					UniToStr(local_name_3, sizeof(local_name_3), local_name_2);

					if (IsEmptyStr(local_name_3) == false)
					{
						StrCpy(local_name, sizeof(local_name), local_name_3);
					}
#endif	// OS_WIN32

					tmp2 = ZeroMalloc(tmp2_size);
					UniFormat(tmp2, tmp2_size, _UU("NATT_MSG"), local_name);

					UniStrCat(tmp, tmpsize, tmp2);

					Free(tmp2);
				}

				{
					if (GetGlobalServerFlag(GSF_SHOW_OSS_MSG) != 0)
					{
						UniStrCat(tmp, tmpsize, _UU("OSS_MSG"));
					}
				}

				{
					UniStrCat(tmp, tmpsize, winver_msg_client);
					UniStrCat(tmp, tmpsize, winver_msg_server);
				}
			}
			UniStrCat(tmp, tmpsize, msg);
			
			utf = CopyUniToUtf(tmp);

			PackAddData(p, "Msg", utf, StrLen(utf));

			Free(tmp);
			Free(utf);
		}

		Free(msg);

		// Brand string for the connection limit
		{
			char *branded_cfroms = _SS("BRANDED_C_FROM_S");
			if(StrLen(branded_cfroms) > 0)
			{
				PackAddStr(p, "branded_cfroms", branded_cfroms);
			}
		}

		HttpServerSend(c->FirstSock, p);
		FreePack(p);

		// Receive a signature
		Copy(&c->Session->NodeInfo, &node, sizeof(NODE_INFO));


		{
			wchar_t tmp[MAX_SIZE * 2];
			NodeInfoToStr(tmp, sizeof(tmp), &s->NodeInfo);

			HLog(hub, "LH_NODE_INFO", s->Name, tmp);

			if (s->VLanId != 0)
			{
				HLog(hub, "LH_VLAN_ID", s->Name, s->VLanId);
			}
		}

		// Shift the connection to the tunneling mode
		StartTunnelingMode(c);

		// Processing of half-connection mode
		if (s->HalfConnection)
		{
			// The direction of the first socket is client to server
			TCPSOCK *ts = (TCPSOCK *)LIST_DATA(c->Tcp->TcpSockList, 0);
			ts->Direction = TCP_CLIENT_TO_SERVER;
		}

		if (s->Hub->Type == HUB_TYPE_FARM_DYNAMIC && s->Cedar->Server != NULL && s->Cedar->Server->ServerType == SERVER_TYPE_FARM_CONTROLLER)
		{
			if (s->Hub->BeingOffline == false)
			{
				// Start the SecureNAT on the dynamic Virtual HUB
				EnableSecureNATEx(s->Hub, false, true);

				cluster_dynamic_secure_nat = true;
			}
		}

		if (s->LocalHostSession)
		{
			// Update the local MAC address list
			RefreshLocalMacAddressList();
		}

		// Discard the user list cache
		DeleteAllUserListCache(hub->UserList);


		// Main routine of the session
		Debug("SessionMain()\n");
		s->NumLoginIncrementUserObject = loggedin_user_object;
		s->NumLoginIncrementHubObject = s->Hub;
		s->NumLoginIncrementTick = Tick64() + (UINT64)NUM_LOGIN_INCREMENT_INTERVAL;
		SessionMain(s);


		// Discard the user list cache
		DeleteAllUserListCache(hub->UserList);

		// Decrement the current number of connections
		Lock(s->Hub->lock);
		{
			if (use_bridge_license)
			{
				Dec(hub->NumSessionsBridge);
			}

			if (use_client_license)
			{
				Dec(hub->NumSessionsClient);
			}

			Dec(s->Hub->NumSessions);
			Dec(s->Hub->Cedar->CurrentSessions);

			// Decrement the number of licenses
			if (use_bridge_license)
			{
				Dec(s->Cedar->AssignedBridgeLicense);
			}

			if (use_client_license)
			{
				Dec(s->Cedar->AssignedClientLicense);
			}

			if (server != NULL)
			{
				// Update the total allocation of the number of licenses for Server structure
				if (server->ServerType == SERVER_TYPE_STANDALONE)
				{
					// Update only stand-alone mode
					// (Periodically polled in the cluster controller mode)
					server->CurrentAssignedClientLicense = Count(s->Cedar->AssignedClientLicense);
					server->CurrentAssignedBridgeLicense = Count(s->Cedar->AssignedBridgeLicense);
				}
			}
		}
		Unlock(s->Hub->lock);

		PrintSessionTotalDataSize(s);

		HLog(s->Hub, "LH_END_SESSION", s->Name, s->TotalSendSizeReal, s->TotalRecvSizeReal);

		if (cluster_dynamic_secure_nat && s->Hub->BeingOffline == false)
		{
			// Stop the SecureNAT on the dynamic Virtual HUB
			EnableSecureNATEx(s->Hub, false, true);
		}

		if (s->UdpAccel != NULL)
		{
			// Release the UDP acceleration
			FreeUdpAccel(s->UdpAccel);
			s->UdpAccel = NULL;
		}

		ReleaseSession(s);

		ret = true;
		c->Err = ERR_SESSION_REMOVED;

		ReleaseHub(hub);

		goto CLEANUP;
	}
	else if (StrCmpi(method, "additional_connect") == 0)
	{
		SOCK *sock;
		TCPSOCK *ts;
		UINT dummy;

		c->Type = CONNECTION_TYPE_ADDITIONAL;

		// Additional connection
		// Read the session key
		if (GetSessionKeyFromPack(p, session_key, &dummy) == false)
		{
			FreePack(p);
			c->Err = ERR_PROTOCOL_ERROR;
			goto CLEANUP;
		}

		FreePack(p);

		// Get the session from the session key
		s = GetSessionFromKey(c->Cedar, session_key);
		if (s == NULL || s->Halt || s->NoReconnectToSession)
		{
			// Session can not be found, or re-connection is prohibited
			Debug("Session Not Found.\n");
			c->Err = ERR_SESSION_TIMEOUT;
			goto CLEANUP;
		}

		// Session is found
		Debug("Session Found: %s\n", s->Name);
		// Check the protocol of session
		c->Err = 0;
		Lock(s->lock);
		{
			if (s->Connection->Protocol != CONNECTION_TCP)
			{
				c->Err = ERR_INVALID_PROTOCOL;
			}
		}
		Unlock(s->lock);
		// Check the current number of connections of the session
		Lock(s->Connection->lock);
		if (c->Err == 0)
		{
			if (Count(s->Connection->CurrentNumConnection) > s->MaxConnection)
			{
				c->Err = ERR_TOO_MANY_CONNECTION;
			}
		}
		if (c->Err != 0)
		{
			Unlock(s->Connection->lock);
			if (c->Err == ERR_TOO_MANY_CONNECTION)
			{
				Debug("Session TOO MANY CONNECTIONS !!: %u\n",
					Count(s->Connection->CurrentNumConnection));
			}
			else
			{
				Debug("Session Invalid Protocol.\n");
			}
			ReleaseSession(s);
			goto CLEANUP;
		}

		// Add the socket of this connection to the connection list of the session (TCP)
		sock = c->FirstSock;

		if (sock->IsRUDPSocket && sock->BulkRecvKey != NULL && sock->BulkSendKey != NULL)
		{
			if (s->BulkRecvKeySize != 0 && s->BulkSendKeySize != 0)
			{
				// Restore R-UDP bulk send/recv keys for additional connections
				Copy(sock->BulkRecvKey->Data, s->BulkRecvKey, s->BulkRecvKeySize);
				sock->BulkRecvKey->Size = s->BulkRecvKeySize;
				Copy(sock->BulkSendKey->Data, s->BulkSendKey, s->BulkSendKeySize);
				sock->BulkSendKey->Size = s->BulkSendKeySize;
			}
		}

		ts = NewTcpSock(sock);
		SetTimeout(sock, CONNECTING_TIMEOUT);
		direction = TCP_BOTH;
		LockList(s->Connection->Tcp->TcpSockList);
		{
			if (s->HalfConnection)
			{
				// In half-connection, directions of the TCP connections are automatically
				// adjusted by examining all current direction of the TCP connections
				UINT i, c2s, s2c;
				c2s = s2c = 0;
				for (i = 0;i < LIST_NUM(s->Connection->Tcp->TcpSockList);i++)
				{
					TCPSOCK *ts = (TCPSOCK *)LIST_DATA(s->Connection->Tcp->TcpSockList, i);
					if (ts->Direction == TCP_SERVER_TO_CLIENT)
					{
						s2c++;
					}
					else
					{
						c2s++;
					}
				}
				if (s2c > c2s)
				{
					direction = TCP_CLIENT_TO_SERVER;
				}
				else
				{
					direction = TCP_SERVER_TO_CLIENT;
				}
				Debug("%u/%u\n", s2c, c2s);
				ts->Direction = direction;
			}
		}
		UnlockList(s->Connection->Tcp->TcpSockList);

		// Return a success result
		p = PackError(ERR_NO_ERROR);
		PackAddInt(p, "direction", direction);

		HttpServerSend(c->FirstSock, p);
		FreePack(p);

		SetTimeout(sock, INFINITE);

		LockList(s->Connection->Tcp->TcpSockList);
		{
			Add(s->Connection->Tcp->TcpSockList, ts);
		}
		UnlockList(s->Connection->Tcp->TcpSockList);

		// Increment the number of connections
		Inc(s->Connection->CurrentNumConnection);
		Debug("TCP Connection Incremented: %u\n", Count(s->Connection->CurrentNumConnection));

		// Issue the Cancel of session
		Cancel(s->Cancel1);

		Unlock(s->Connection->lock);

		c->flag1 = true;

		ReleaseSession(s);

		return true;
	}
	else if (StrCmpi(method, "enum_hub") == 0)
	{
		// Enumerate the Virtual HUB
		UINT i, num;
		LIST *o;
		o = NewListFast(NULL);

		c->Type = CONNECTION_TYPE_ENUM_HUB;

		FreePack(p);
		p = NewPack();
		LockList(c->Cedar->HubList);
		{
			num = LIST_NUM(c->Cedar->HubList);
			for (i = 0;i < num;i++)
			{
				HUB *h = LIST_DATA(c->Cedar->HubList, i);
				if (h->Option != NULL && h->Option->NoEnum == false)
				{
					Insert(o, CopyStr(h->Name));
				}
			}
		}
		UnlockList(c->Cedar->HubList);

		num = LIST_NUM(o);
		for (i = 0;i < num;i++)
		{
			char *name = LIST_DATA(o, i);
			PackAddStrEx(p, "HubName", name, i, num);
			Free(name);
		}
		ReleaseList(o);
		PackAddInt(p, "NumHub", num);

		HttpServerSend(c->FirstSock, p);
		FreePack(p);
		FreePack(HttpServerRecv(c->FirstSock));
		c->Err = 0;

		SLog(c->Cedar, "LS_ENUM_HUB", c->Name, num);

		error_detail = "enum_hub";

		goto CLEANUP;
	}
	else if (StrCmpi(method, "farm_connect") == 0)
	{
		// Server farm connection request
		CEDAR *cedar = c->Cedar;
		c->Type = CONNECTION_TYPE_FARM_RPC;
		c->Err = 0;
		if (c->Cedar->Server == NULL)
		{
			// Unsupported
			c->Err = ERR_NOT_FARM_CONTROLLER;
		}
		else
		{
			SERVER *s = c->Cedar->Server;
			if (s->ServerType != SERVER_TYPE_FARM_CONTROLLER || s->FarmControllerInited == false)
			{
				// Not a farm controller
				SLog(c->Cedar, "LS_FARM_ACCEPT_1", c->Name);
				c->Err = ERR_NOT_FARM_CONTROLLER;
			}
			else
			{
				UCHAR check_secure_password[SHA1_SIZE];
				UCHAR secure_password[SHA1_SIZE];
				// User authentication
				SecurePassword(check_secure_password, s->HashedPassword, c->Random);
				if (PackGetDataSize(p, "SecurePassword") == sizeof(secure_password))
				{
					PackGetData(p, "SecurePassword", secure_password);
				}
				else
				{
					Zero(secure_password, sizeof(secure_password));
				}

				if (Cmp(secure_password, check_secure_password, SHA1_SIZE) != 0)
				{
					// Password is different
					SLog(c->Cedar, "LS_FARM_ACCEPT_2", c->Name);
					c->Err = ERR_ACCESS_DENIED;
				}
				else
				{
					// Get the certificate
					BUF *b;
					X *server_x;

					SLog(c->Cedar, "LS_FARM_ACCEPT_3", c->Name);
					b = PackGetBuf(p, "ServerCert");
					if (b == NULL)
					{
						c->Err = ERR_PROTOCOL_ERROR;
					}
					else
					{
						server_x = BufToX(b, false);
						FreeBuf(b);
						if (server_x == NULL)
						{
							c->Err = ERR_PROTOCOL_ERROR;
						}
						else
						{
							UINT ip;
							UINT point;
							char hostname[MAX_SIZE];

#ifdef	OS_WIN32
							MsSetThreadPriorityRealtime();
#endif	// OS_WIN32

							SetTimeout(c->FirstSock, SERVER_CONTROL_TCP_TIMEOUT);

							ip = PackGetIp32(p, "PublicIp");
							point = PackGetInt(p, "Point");
							if (PackGetStr(p, "HostName", hostname, sizeof(hostname)))
							{
								UINT num_port = PackGetIndexCount(p, "PublicPort");
								if (num_port >= 1 && num_port <= MAX_PUBLIC_PORT_NUM)
								{
									UINT *ports = ZeroMalloc(sizeof(UINT) * num_port);
									UINT i;

									for (i = 0;i < num_port;i++)
									{
										ports[i] = PackGetIntEx(p, "PublicPort", i);
									}

									SiFarmServ(s, c->FirstSock, server_x, ip, num_port, ports, hostname, point,
										PackGetInt(p, "Weight"), PackGetInt(p, "MaxSessions"));

									Free(ports);
								}
							}

							FreeX(server_x);
						}
					}
				}
			}
		}
		FreePack(p);
		goto CLEANUP;
	}
	else if (StrCmpi(method, "admin") == 0 && c->Cedar->Server != NULL)
	{
		UINT err;
		// Administrative RPC connection request
		c->Type = CONNECTION_TYPE_ADMIN_RPC;
		err = AdminAccept(c, p);
		FreePack(p);
		if (err != ERR_NO_ERROR)
		{
			PACK *p = PackError(err);
			HttpServerSend(c->FirstSock, p);
			FreePack(p);
		}

		error_detail = "admin_rpc";

		goto CLEANUP;
	}
	else if (StrCmpi(method, "password") == 0)
	{
		UINT err;
		// Password change request
		c->Type = CONNECTION_TYPE_PASSWORD;
		err = ChangePasswordAccept(c, p);
		FreePack(p);

		p = PackError(err);
		HttpServerSend(c->FirstSock, p);
		FreePack(p);

		error_detail = "change_password";

		goto CLEANUP;
	}
	else
	{
		// Unknown method
		FreePack(p);
		c->Err = ERR_PROTOCOL_ERROR;

		error_detail = "unknown_method";

		goto CLEANUP;
	}

CLEANUP:
	// Release the user object
	if (loggedin_user_object != NULL)
	{
		ReleaseUser(loggedin_user_object);
	}


	// Error packet transmission
	if (supress_return_pack_error == false)
	{
		p = PackError(c->Err);
		PackAddBool(p, "no_save_password", no_save_password);
		HttpServerSend(c->FirstSock, p);
		FreePack(p);
	}

	FreePack(HttpServerRecv(c->FirstSock));

	SleepThread(25);

	SLog(c->Cedar, "LS_CONNECTION_ERROR", c->Name, GetUniErrorStr(c->Err), c->Err);

	if (release_me_eap_client != NULL)
	{
		ReleaseEapClient(release_me_eap_client);
	}

	return ret;
}


// Create a Node information
void CreateNodeInfo(NODE_INFO *info, CONNECTION *c)
{
	SESSION *s;
	OS_INFO *os;
	char *product_id;
	IP ip;
	// Validate arguments
	if (c == NULL)
	{
		return;
	}

	s = c->Session;
	os = GetOsInfo();



	Zero(info, sizeof(NODE_INFO));

	// Client product name
	StrCpy(info->ClientProductName, sizeof(info->ClientProductName), c->ClientStr);
	// Client version
	info->ClientProductVer = Endian32(c->ClientVer);
	// Client build number
	info->ClientProductBuild = Endian32(c->ClientBuild);

	// Server product name
	StrCpy(info->ServerProductName, sizeof(info->ServerProductName), c->ServerStr);
	// Server version
	info->ServerProductVer = Endian32(c->ServerVer);
	// Server build number
	info->ServerProductBuild = Endian32(c->ServerBuild);

	// Client OS name
	StrCpy(info->ClientOsName, sizeof(info->ClientOsName), os->OsProductName);
	// Client OS version
	StrCpy(info->ClientOsVer, sizeof(info->ClientOsVer), os->OsVersion);
	// Client OS Product ID
	product_id = OSGetProductId();
	StrCpy(info->ClientOsProductId, sizeof(info->ClientOsProductId), product_id);
	Free(product_id);

	// Client host name
#ifndef	OS_WIN32
	GetMachineName(info->ClientHostname, sizeof(info->ClientHostname));
#else	// OS_WIN32
	if (true)
	{
		wchar_t namew[256];
		char namea[256];

		Zero(namew, sizeof(namew));
		MsGetComputerNameFullEx(namew, sizeof(namew), true);

		Zero(namea, sizeof(namea));
		UniToStr(namea, sizeof(namea), namew);

		if (IsEmptyStr(namea))
		{
			GetMachineName(namea, sizeof(namea));
		}

		StrCpy(info->ClientHostname, sizeof(info->ClientHostname), namea);

	}
#endif	// OS_WIN32
	// Client IP address
	if (IsIP6(&c->FirstSock->LocalIP) == false)
	{
		info->ClientIpAddress = IPToUINT(&c->FirstSock->LocalIP);
	}
	else
	{
		Copy(info->ClientIpAddress6, c->FirstSock->LocalIP.address, sizeof(info->ClientIpAddress6));
	}
	// Client port number
	info->ClientPort = Endian32(c->FirstSock->LocalPort);

	// Server host name
	StrCpy(info->ServerHostname, sizeof(info->ServerHostname), c->ServerName);
	// Server IP address
	if (s->ClientOption->ProxyType == PROXY_DIRECT)
	{
		if (IsIP6(&c->FirstSock->RemoteIP) == false)
		{
			info->ServerIpAddress = IPToUINT(&c->FirstSock->RemoteIP);
		}
		else
		{
			Copy(info->ServerIpAddress6, c->FirstSock->RemoteIP.address, sizeof(info->ServerIpAddress6));
		}
	}
	else if (GetIP(&ip, info->ServerHostname))
	{
		if (IsIP6(&ip) == false)
		{
			info->ServerIpAddress = IPToUINT(&ip);
		}
		else
		{
			Copy(info->ServerIpAddress6, ip.address, sizeof(info->ServerIpAddress6));
		}
	}
	// Server port number
	info->ServerPort = Endian32(c->ServerPort);

	if (s->ClientOption->ProxyType == PROXY_SOCKS || s->ClientOption->ProxyType == PROXY_HTTP)
	{
		// Proxy host name
		StrCpy(info->ProxyHostname, sizeof(info->ProxyHostname), s->ClientOption->ProxyName);

		// Proxy Server IP Address
		if (IsIP6(&c->FirstSock->RemoteIP) == false)
		{
			info->ProxyIpAddress = IPToUINT(&c->FirstSock->RemoteIP);
		}
		else
		{
			Copy(&info->ProxyIpAddress6, c->FirstSock->RemoteIP.address, sizeof(info->ProxyIpAddress6));
		}

		info->ProxyPort = Endian32(c->FirstSock->RemotePort);
	}

	// HUB name
	StrCpy(info->HubName, sizeof(info->HubName), s->ClientOption->HubName);

	// Unique ID
	Copy(info->UniqueId, c->Cedar->UniqueId, sizeof(info->UniqueId));
}

// Connect a socket additionally
SOCK *ClientAdditionalConnectToServer(CONNECTION *c)
{
	SOCK *s;
	// Validate arguments
	if (c == NULL)
	{
		return NULL;
	}

	// Socket connection
	s = ClientConnectGetSocket(c, true);
	if (s == NULL)
	{
		// Connection failure
		return NULL;
	}

	// Add the socket to the list
	LockList(c->ConnectingSocks);
	{
		Add(c->ConnectingSocks, s);
		AddRef(s->ref);
	}
	UnlockList(c->ConnectingSocks);

	if (c->Session->Halt)
	{
		// Stop
		Disconnect(s);
		LockList(c->ConnectingSocks);
		{
			if (Delete(c->ConnectingSocks, s))
			{
				ReleaseSock(s);
			}
		}
		UnlockList(c->ConnectingSocks);
		ReleaseSock(s);
		return NULL;
	}

	// Time-out
	SetTimeout(s, CONNECTING_TIMEOUT);

	// Start the SSL communication
	if (StartSSLEx(s, NULL, NULL, 0, c->ServerName) == false)
	{
		// SSL communication failure
		Disconnect(s);
		LockList(c->ConnectingSocks);
		{
			if (Delete(c->ConnectingSocks, s))
			{
				ReleaseSock(s);
			}
		}
		UnlockList(c->ConnectingSocks);
		ReleaseSock(s);
		return NULL;
	}

	// Check the certificate
	if (CompareX(s->RemoteX, c->ServerX) == false)
	{
		// The certificate is invalid
		Disconnect(s);
		c->Session->SessionTimeOuted = true;
	}

	return s;
}

// Attempt to sign by the secure device
UINT SecureSign(SECURE_SIGN *sign, UINT device_id, char *pin)
{
	SECURE *sec;
	X *x;
	// Validate arguments
	if (sign == false || pin == NULL || device_id == 0)
	{
		return ERR_INTERNAL_ERROR;
	}

	// Open the device
	sec = OpenSec(device_id);
	if (sec == NULL)
	{
		return ERR_SECURE_DEVICE_OPEN_FAILED;
	}

	// Open the session
	if (OpenSecSession(sec, 0) == false)
	{
		CloseSec(sec);
		return ERR_SECURE_DEVICE_OPEN_FAILED;
	}

	// Login
	if (LoginSec(sec, pin) == false)
	{
		CloseSecSession(sec);
		CloseSec(sec);
		return ERR_SECURE_PIN_LOGIN_FAILED;
	}

	// Read the certificate
	x = ReadSecCert(sec, sign->SecurePublicCertName);
	if (x == NULL)
	{
		LogoutSec(sec);
		CloseSecSession(sec);
		CloseSec(sec);
		return ERR_SECURE_NO_CERT;
	}

	// Sign by the private key
	if (SignSec(sec, sign->SecurePrivateKeyName, sign->Signature, sign->Random, SHA1_SIZE) == false)
	{
		// Signing failure
		FreeX(x);
		LogoutSec(sec);
		CloseSecSession(sec);
		CloseSec(sec);
		return ERR_SECURE_NO_PRIVATE_KEY;
	}

	// Convert the certificate to buffer
	sign->ClientCert = x;

	// Log out
	LogoutSec(sec);

	// Close the session
	CloseSecSession(sec);

	// Close the device
	CloseSec(sec);

	// Success
	return ERR_NO_ERROR;
}

// Client connects to the server additionally
bool ClientAdditionalConnect(CONNECTION *c, THREAD *t)
{
	SOCK *s;
	PACK *p;
	TCPSOCK *ts;
	UINT err;
	UINT direction;

	// Validate arguments
	if (c == NULL)
	{
		return false;
	}

	// Socket connection to the server
	s = ClientAdditionalConnectToServer(c);
	if (s == NULL)
	{
		// Failed to connect socket
		return false;
	}

	if (c->Halt)
	{
		goto CLEANUP;
	}

	// Send a signature
	Debug("Uploading Signature...\n");
	if (ClientUploadSignature(s) == false)
	{
		goto CLEANUP;
	}

	if (c->Halt)
	{
		// Stop
		goto CLEANUP;
	}

	// Receive a Hello packet
	Debug("Downloading Hello...\n");
	if (ClientDownloadHello(c, s) == false)
	{
		goto CLEANUP;
	}

	if (c->Halt)
	{
		// Stop
		goto CLEANUP;
	}

	// Send a authentication data for the additional connection
	if (ClientUploadAuth2(c, s) == false)
	{
		// Disconnected
		goto CLEANUP;
	}

	// Receive a response
	p = HttpClientRecv(s);
	if (p == NULL)
	{
		// Disconnected
		goto CLEANUP;
	}

	err = GetErrorFromPack(p);
	direction = PackGetInt(p, "direction");

	FreePack(p);
	p = NULL;

	if (err != 0)
	{
		// Error has occurred
		Debug("Additional Connect Error: %u\n", err);
		if (err == ERR_SESSION_TIMEOUT || err == ERR_INVALID_PROTOCOL)
		{
			// We shall re-connection because it is a fatal error
			c->Session->SessionTimeOuted = true;
		}
		goto CLEANUP;
	}

	Debug("Additional Connect Succeed!\n");

	if (s->IsRUDPSocket && s->BulkRecvKey != NULL && s->BulkSendKey != NULL)
	{
		// Restore R-UDP bulk send/recv keys for additional connections
		if (c->Session->BulkRecvKeySize != 0 && c->Session->BulkSendKeySize != 0)
		{
			Copy(s->BulkRecvKey->Data, c->Session->BulkRecvKey, c->Session->BulkRecvKeySize);
			s->BulkRecvKey->Size = c->Session->BulkRecvKeySize;

			Copy(s->BulkSendKey->Data, c->Session->BulkSendKey, c->Session->BulkSendKeySize);
			s->BulkSendKey->Size = c->Session->BulkSendKeySize;
		}
	}

	// Success the additional connection
	// Add to the TcpSockList of the connection
	ts = NewTcpSock(s);

	if (c->ServerMode == false)
	{
		if (c->Session->ClientOption->ConnectionDisconnectSpan != 0)
		{
			ts->DisconnectTick = Tick64() + c->Session->ClientOption->ConnectionDisconnectSpan * (UINT64)1000;
		}
	}

	LockList(c->Tcp->TcpSockList);
	{
		ts->Direction = direction;
		Add(c->Tcp->TcpSockList, ts);
	}
	UnlockList(c->Tcp->TcpSockList);
	Debug("TCP Connection Incremented: %u\n", Count(c->CurrentNumConnection));

	if (c->Session->HalfConnection)
	{
		Debug("New Half Connection: %s\n",
			direction == TCP_SERVER_TO_CLIENT ? "TCP_SERVER_TO_CLIENT" : "TCP_CLIENT_TO_SERVER"
			);
	}

	// Issue the Cancel to the session
	Cancel(c->Session->Cancel1);

	// Remove the socket from the socket list of connected
	LockList(c->ConnectingSocks);
	{
		if (Delete(c->ConnectingSocks, s))
		{
			ReleaseSock(s);
		}
	}
	UnlockList(c->ConnectingSocks);
	ReleaseSock(s);
	return true;

CLEANUP:
	// Disconnection process
	Disconnect(s);
	LockList(c->ConnectingSocks);
	{
		if (Delete(c->ConnectingSocks, s))
		{
			ReleaseSock(s);

		}
	}
	UnlockList(c->ConnectingSocks);
	ReleaseSock(s);
	return false;
}

// Secure device signing thread
void ClientSecureSignThread(THREAD *thread, void *param)
{
	SECURE_SIGN_THREAD_PROC *p = (SECURE_SIGN_THREAD_PROC *)param;
	// Validate arguments
	if (thread == NULL || param == NULL)
	{
		return;
	}

	NoticeThreadInit(thread);

	p->Ok = p->SecureSignProc(p->Connection->Session, p->Connection, p->SecureSign);
	p->UserFinished = true;
}

// Signing with the secure device
bool ClientSecureSign(CONNECTION *c, UCHAR *sign, UCHAR *random, X **x)
{
	SECURE_SIGN_THREAD_PROC *p;
	SECURE_SIGN *ss;
	SESSION *s;
	CLIENT_OPTION *o;
	CLIENT_AUTH *a;
	THREAD *thread;
	UINT64 start;
	bool ret;
	// Validate arguments
	if (c == NULL || sign == NULL || random == NULL || x == NULL)
	{
		return false;
	}

	s = c->Session;
	o = s->ClientOption;
	a = s->ClientAuth;

	p = ZeroMalloc(sizeof(SECURE_SIGN_THREAD_PROC));
	p->Connection = c;
	ss = p->SecureSign = ZeroMallocEx(sizeof(SECURE_SIGN), true);
	StrCpy(ss->SecurePrivateKeyName, sizeof(ss->SecurePrivateKeyName),
		a->SecurePrivateKeyName);
	StrCpy(ss->SecurePublicCertName, sizeof(ss->SecurePublicCertName),
		a->SecurePublicCertName);
	ss->UseSecureDeviceId = c->Cedar->Client->UseSecureDeviceId;
	Copy(ss->Random, random, SHA1_SIZE);

#ifdef	OS_WIN32
	ss->BitmapId = CmGetSecureBitmapId(c->ServerName);
#endif	// OS_WIN32

	p->SecureSignProc = a->SecureSignProc;

	// Create a thread
	thread = NewThread(ClientSecureSignThread, p);
	WaitThreadInit(thread);

	// Poll every 0.5 seconds until signing is completed or canceled
	start = Tick64();
	while (true)
	{
		if ((Tick64() - start) > CONNECTING_POOLING_SPAN)
		{
			// Send a NOOP periodically for disconnection prevention
			start = Tick64();
			ClientUploadNoop(c);
		}
		if (p->UserFinished)
		{
			// User selected
			break;
		}
		WaitThread(thread, 500);
	}
	ReleaseThread(thread);

	ret = p->Ok;

	if (ret)
	{
		Copy(sign, ss->Signature, sizeof(ss->Signature));
		*x = ss->ClientCert;
	}

	Free(p->SecureSign);
	Free(p);

	return ret;
}

// Server certificate confirmation thread
void ClientCheckServerCertThread(THREAD *thread, void *param)
{
	CHECK_CERT_THREAD_PROC *p = (CHECK_CERT_THREAD_PROC *)param;
	// Validate arguments
	if (thread == NULL || param == NULL)
	{
		return;
	}

	// Notify the completion of initialization
	NoticeThreadInit(thread);

	// Query for the selection to the user
	p->Ok = p->CheckCertProc(p->Connection->Session, p->Connection, p->ServerX, &p->Expired);
	p->UserSelected = true;
}

// Client verify the certificate of the server
bool ClientCheckServerCert(CONNECTION *c, bool *expired)
{
	CLIENT_AUTH *auth;
	X *x;
	CHECK_CERT_THREAD_PROC *p;
	THREAD *thread;
	bool ret;
	UINT64 start;
	// Validate arguments
	if (c == NULL)
	{
		return false;
	}

	if (expired != NULL)
	{
		*expired = false;
	}

	auth = c->Session->ClientAuth;

	if (auth->CheckCertProc == NULL)
	{
		return false;
	}

	x = CloneX(c->FirstSock->RemoteX);
	if (x == NULL)
	{
		// Strange error occurs
		return false;
	}

	p = ZeroMalloc(sizeof(CHECK_CERT_THREAD_PROC));
	p->ServerX = x;
	p->CheckCertProc = auth->CheckCertProc;
	p->Connection = c;

	// Create a thread
	thread = NewThread(ClientCheckServerCertThread, p);
	WaitThreadInit(thread);

	// Poll at 0.5-second intervals until the user selects whether the connection
	start = Tick64();
	while (true)
	{
		if ((Tick64() - start) > CONNECTING_POOLING_SPAN)
		{
			// Send a NOOP periodically for disconnection prevention
			start = Tick64();
			// Do not send because we now ask for user permission before sending signature
			//ClientUploadNoop(c);
		}
		if (p->UserSelected)
		{
			// User-selected
			break;
		}
		WaitThread(thread, 500);
	}

	if (expired != NULL)
	{
		*expired = p->Expired;
	}

	ret = p->Ok;
	FreeX(p->ServerX);
	Free(p);
	ReleaseThread(thread);

	return ret;
}

// Client connects to the server
bool ClientConnect(CONNECTION *c)
{
	bool ret = false;
	bool ok = false;
	UINT err;
	SOCK *s;
	PACK *p = NULL;
	UINT session_key_32;
	SESSION *sess;
	char session_name[MAX_SESSION_NAME_LEN + 1];
	char connection_name[MAX_CONNECTION_NAME_LEN + 1];
	UCHAR session_key[SHA1_SIZE];
	POLICY *policy;
	bool expired = false;
	IP server_ip;
	// Validate arguments
	if (c == NULL)
	{
		return false;
	}

	sess = c->Session;

	PrintStatus(sess, L"init");
	PrintStatus(sess, _UU("STATUS_1"));

REDIRECTED:

	// [Connecting]
	c->Status = CONNECTION_STATUS_CONNECTING;
	c->Session->ClientStatus = CLIENT_STATUS_CONNECTING;

	s = ClientConnectToServer(c);
	if (s == NULL)
	{
		// Do not retry if untrusted or hostname mismatched
		if (c->Session->LinkModeClient == false && (c->Err == ERR_CERT_NOT_TRUSTED || c->Err == ERR_HOSTNAME_MISMATCH)
			&& (c->Session->Account == NULL || ! c->Session->Account->RetryOnServerCert))
		{
			c->Session->ForceStopFlag = true;
		}
		PrintStatus(sess, L"free");
		return false;
	}

	PrintStatus(sess, _UU("STATUS_5"));

	// Prompt user whether to continue on verification errors
	if ((c->Err == ERR_CERT_NOT_TRUSTED || c->Err == ERR_HOSTNAME_MISMATCH || c->Err == ERR_SERVER_CERT_EXPIRES) && ClientCheckServerCert(c, &expired) == false)
	{
		if (expired)
		{
			c->Err = ERR_SERVER_CERT_EXPIRES;
		}

		// Do not retry if untrusted or hostname mismatched
		if (c->Session->LinkModeClient == false && (c->Err == ERR_CERT_NOT_TRUSTED || c->Err == ERR_HOSTNAME_MISMATCH)
			&& (c->Session->Account == NULL || ! c->Session->Account->RetryOnServerCert))
		{
			c->Session->ForceStopFlag = true;
		}

		goto CLEANUP;
	}

	// Check the certificate of the redirected VPN server
	if (c->UseTicket && CompareX(s->RemoteX, c->ServerX) == false)
	{
		c->Err = ERR_CERT_NOT_TRUSTED;
		goto CLEANUP;
	}

	Copy(&server_ip, &s->RemoteIP, sizeof(IP));

	if (c->Halt)
	{
		// Stop
		c->Err = ERR_USER_CANCEL;
		goto CLEANUP;
	}

	// [Negotiating]
	c->Session->ClientStatus = CLIENT_STATUS_NEGOTIATION;

	// Initialize the UDP acceleration function
	if (sess->ClientOption != NULL && sess->ClientOption->NoUdpAcceleration == false)
	{
		if (sess->ClientOption->ProxyType == PROXY_DIRECT)
		{
			if (s->Type == SOCK_TCP)
			{
				if (sess->UdpAccel == NULL)
				{
					bool no_nat_t = false;

					if (sess->ClientOption->PortUDP != 0)
					{
						// There is no need for NAT-T treatment on my part if the UDP port on the other end is known beforehand
						no_nat_t = true;
					}


					sess->UdpAccel = NewUdpAccel(c->Cedar, &s->LocalIP, true, true, no_nat_t);
				}
			}
		}
	}

	// Send a signature
	Debug("Uploading Signature...\n");
	if (ClientUploadSignature(s) == false)
	{
		c->Err = ERR_DISCONNECTED;
		goto CLEANUP;
	}

	if (c->Halt)
	{
		// Stop
		c->Err = ERR_USER_CANCEL;
		goto CLEANUP;
	}

	// Receive a Hello packet
	Debug("Downloading Hello...\n");
	if (ClientDownloadHello(c, s) == false)
	{
		goto CLEANUP;
	}

	if (c->Session->ClientOption != NULL && c->Session->ClientOption->FromAdminPack)
	{
		if (IsAdminPackSupportedServerProduct(c->ServerStr) == false)
		{
			c->Err = ERR_NOT_ADMINPACK_SERVER;
			goto CLEANUP;
		}
	}

	if (c->Halt)
	{
		// Stop
		c->Err = ERR_USER_CANCEL;
		goto CLEANUP;
	}

	Debug("Server Version : %u\n"
		"Server String  : %s\n"
		"Server Build   : %u\n"
		"Client Version : %u\n"
		"Client String  : %s\n"
		"Client Build   : %u\n",
		c->ServerVer, c->ServerStr, c->ServerBuild,
		c->ClientVer, c->ClientStr, c->ClientBuild);

	// During user authentication
	c->Session->ClientStatus = CLIENT_STATUS_AUTH;

	PrintStatus(sess, _UU("STATUS_6"));

	// Send the authentication data
	if (ClientUploadAuth(c) == false)
	{
		goto CLEANUP;
	}

	if (c->Halt)
	{
		// Stop
		c->Err = ERR_USER_CANCEL;
		goto CLEANUP;
	}

	// Receive a Welcome packet
	p = HttpClientRecv(s);
	if (p == NULL)
	{
		c->Err = ERR_DISCONNECTED;
		goto CLEANUP;
	}

	// Error checking
	err = GetErrorFromPack(p);
	if (err != 0)
	{
		// An error has occured
		c->Err = err;
		c->ClientConnectError_NoSavePassword = PackGetBool(p, "no_save_password");
		goto CLEANUP;
	}

	// Branding string check for the connection limit
	{
		char tmp[20];
		char *branded_cfroms = _SS("BRANDED_C_FROM_S");
		PackGetStr(p, "branded_cfroms", tmp, sizeof(tmp));

		if(StrLen(branded_cfroms) > 0 && StrCmpi(branded_cfroms, tmp) != 0)
		{
			c->Err = ERR_BRANDED_C_FROM_S;
			goto CLEANUP;
		}
	}

	if (c->Cedar->Server == NULL)
	{
		// Suppress client notification flag
		if (PackIsValueExists(p, "suppress_client_update_notification"))
		{
			bool suppress_client_update_notification = PackGetBool(p, "suppress_client_update_notification");

#ifdef	OS_WIN32
			MsRegWriteIntEx2(REG_LOCAL_MACHINE, PROTO_SUPPRESS_CLIENT_UPDATE_NOTIFICATION_REGKEY, PROTO_SUPPRESS_CLIENT_UPDATE_NOTIFICATION_REGVALUE,
				(suppress_client_update_notification ? 1 : 0), false, true);
#endif	// OS_WIN32
		}
	}

	if (true)
	{
		// Message retrieval
		UINT utf_size;
		char *utf;
		wchar_t *msg;

		utf_size = PackGetDataSize(p, "Msg");
		utf = ZeroMalloc(utf_size + 8);
		PackGetData(p, "Msg", utf);

		msg = CopyUtfToUni(utf);

		if (IsEmptyUniStr(msg) == false)
		{
			if (c->Session->Client_Message != NULL)
			{
				Free(c->Session->Client_Message);
			}

			c->Session->Client_Message = msg;
		}
		else
		{
			Free(msg);
		}

		Free(utf);
	}

	if (PackGetInt(p, "Redirect") != 0)
	{
		UINT i;
		UINT ip;
		UINT num_port;
		UINT *ports;
		UINT use_port = 0;
		UINT current_port = c->ServerPort;
		UCHAR ticket[SHA1_SIZE];
		X *server_cert = NULL;
		BUF *b;

		// Redirect mode
		PrintStatus(sess, _UU("STATUS_8"));

		ip = PackGetIp32(p, "Ip");
		num_port = MAX(MIN(PackGetIndexCount(p, "Port"), MAX_PUBLIC_PORT_NUM), 1);
		ports = ZeroMalloc(sizeof(UINT) * num_port);
		for (i = 0;i < num_port;i++)
		{
			ports[i] = PackGetIntEx(p, "Port", i);
		}

		// Select a port number
		for (i = 0;i < num_port;i++)
		{
			if (ports[i] == current_port)
			{
				use_port = current_port;
			}
		}
		if (use_port == 0)
		{
			use_port = ports[0];
		}

		Free(ports);

		if (PackGetDataSize(p, "Ticket") == SHA1_SIZE)
		{
			PackGetData(p, "Ticket", ticket);
		}

		b = PackGetBuf(p, "Cert");
		if (b != NULL)
		{
			server_cert = BufToX(b, false);
			FreeBuf(b);
		}

		if (c->ServerX != NULL)
		{
			FreeX(c->ServerX);
		}
		c->ServerX = server_cert;

		IPToStr32(c->ServerName, sizeof(c->ServerName), ip);
		c->ServerPort = use_port;

		c->UseTicket = true;
		Copy(c->Ticket, ticket, SHA1_SIZE);

		FreePack(p);

		p = NewPack();
		HttpClientSend(s, p);
		FreePack(p);

		p = NULL;

		c->FirstSock = NULL;
		Disconnect(s);
		ReleaseSock(s);
		s = NULL;

		goto REDIRECTED;
	}

	PrintStatus(sess, _UU("STATUS_7"));

	// Parse the Welcome packet
	if (ParseWelcomeFromPack(p, session_name, sizeof(session_name),
		connection_name, sizeof(connection_name), &policy) == false)
	{
		// Parsing failure
		c->Err = ERR_PROTOCOL_ERROR;
		goto CLEANUP;
	}

	// Get the session key
	if (GetSessionKeyFromPack(p, session_key, &session_key_32) == false)
	{
		// Acquisition failure
		Free(policy);
		policy = NULL;
		c->Err = ERR_PROTOCOL_ERROR;
		goto CLEANUP;
	}

	Copy(c->Session->SessionKey, session_key, SHA1_SIZE);
	c->Session->SessionKey32 = session_key_32;

	// Save the contents of the Welcome packet
	Debug("session_name: %s, connection_name: %s\n",
		session_name, connection_name);

	Lock(c->Session->lock);
	{
		// Deploy and update connection parameters
		sess->EnableUdpRecovery = PackGetBool(p, "enable_udp_recovery");
		c->Session->MaxConnection = PackGetInt(p, "max_connection");

		if (sess->EnableUdpRecovery == false)
		{
			c->Session->MaxConnection = MIN(c->Session->MaxConnection, c->Session->ClientOption->MaxConnection);
		}

		c->Session->MaxConnection = MIN(c->Session->MaxConnection, MAX_TCP_CONNECTION);
		c->Session->MaxConnection = MAX(c->Session->MaxConnection, 1);
		c->Session->UseCompress = PackGetInt(p, "use_compress") == 0 ? false : true;
		c->Session->UseEncrypt = PackGetInt(p, "use_encrypt") == 0 ? false : true;
		c->Session->NoSendSignature = PackGetBool(p, "no_send_signature");
		c->Session->HalfConnection = PackGetInt(p, "half_connection") == 0 ? false : true;
		c->Session->IsAzureSession = PackGetInt(p, "is_azure_session") == 0 ? false : true;
		c->Session->Timeout = PackGetInt(p, "timeout");
		c->Session->QoS = PackGetInt(p, "qos") == 0 ? false : true;
		if (c->Session->QoS)
		{
			c->Session->MaxConnection = MAX(c->Session->MaxConnection, (UINT)(c->Session->HalfConnection ? 4 : 2));
		}
		c->Session->VLanId = PackGetInt(p, "vlan_id");

		// R-UDP Session ?
		c->Session->IsRUDPSession = s->IsRUDPSocket;

		ZeroIP4(&c->Session->AzureRealServerGlobalIp);

		if (c->Session->IsAzureSession)
		{
			// Disable the life parameter of the connection in the case of VPN Azure relayed session
			c->Session->ClientOption->ConnectionDisconnectSpan = 0;

			// Get the AzureRealServerGlobalIp the case of VPN Azure relayed
			PackGetIp(p, "azure_real_server_global_ip", &c->Session->AzureRealServerGlobalIp);
		}

		if (c->Session->IsRUDPSession)
		{
			// Disable the life parameter of the connection in the case of R-UDP session
			c->Session->ClientOption->ConnectionDisconnectSpan = 0;

			// Disable QoS, etc. in the case of R-UDP session
			c->Session->QoS = false;
			c->Session->HalfConnection = false;

			if (c->Session->EnableUdpRecovery == false)
			{
				// Set the number of connection to 1 if UDP recovery is not supported
				c->Session->MaxConnection = 1;
			}
		}

		// Physical communication protocol
		StrCpy(c->Session->UnderlayProtocol, sizeof(c->Session->UnderlayProtocol), s->UnderlayProtocol);

		AddProtocolDetailsStr(c->Session->ProtocolDetails, sizeof(c->Session->ProtocolDetails), s->ProtocolDetails);

		if (c->Session->IsAzureSession)
		{
			StrCpy(c->Session->UnderlayProtocol, sizeof(c->Session->UnderlayProtocol), SOCK_UNDERLAY_AZURE);

			AddProtocolDetailsStr(c->Session->ProtocolDetails, sizeof(c->Session->ProtocolDetails), "VPN Azure");
		}

		if (c->Protocol == CONNECTION_UDP)
		{
			// In the case of UDP protocol, receive the key from the server
			if (PackGetDataSize(p, "udp_send_key") == sizeof(c->Session->UdpSendKey))
			{
				PackGetData(p, "udp_send_key", c->Session->UdpSendKey);
			}

			if (PackGetDataSize(p, "udp_recv_key") == sizeof(c->Session->UdpRecvKey))
			{
				PackGetData(p, "udp_recv_key", c->Session->UdpRecvKey);
			}
		}

		sess->EnableBulkOnRUDP = false;
		sess->EnableHMacOnBulkOfRUDP = false;
		if (s != NULL && s->IsRUDPSocket && s->BulkRecvKey != NULL && s->BulkSendKey != NULL)
		{
			// Bulk transfer on R-UDP
			sess->EnableHMacOnBulkOfRUDP = PackGetBool(p, "enable_hmac_on_bulk_of_rudp");
			sess->BulkOnRUDPVersion = PackGetInt(p, "rudp_bulk_version");

			if (PackGetBool(p, "enable_bulk_on_rudp"))
			{
				// Receive the key
				UCHAR key_send[RUDP_BULK_KEY_SIZE_MAX];
				UCHAR key_recv[RUDP_BULK_KEY_SIZE_MAX];

				UINT key_size = SHA1_SIZE;

				if (sess->BulkOnRUDPVersion == 2)
				{
					key_size = RUDP_BULK_KEY_SIZE_V2;
				}

				if (PackGetData2(p, "bulk_on_rudp_send_key", key_send, key_size) &&
					PackGetData2(p, "bulk_on_rudp_recv_key", key_recv, key_size))
				{
					sess->EnableBulkOnRUDP = true;

					Copy(s->BulkSendKey->Data, key_send, key_size);
					Copy(s->BulkRecvKey->Data, key_recv, key_size);

					s->BulkSendKey->Size = key_size;
					s->BulkRecvKey->Size = key_size;

					// Backup R-UDP bulk send/recv keys for additional connections
					Copy(sess->BulkSendKey, s->BulkSendKey->Data, s->BulkSendKey->Size);
					sess->BulkSendKeySize = s->BulkSendKey->Size;

					Copy(sess->BulkRecvKey, s->BulkRecvKey->Data, s->BulkRecvKey->Size);
					sess->BulkRecvKeySize = s->BulkRecvKey->Size;

					AddProtocolDetailsKeyValueInt(sess->ProtocolDetails, sizeof(sess->ProtocolDetails), "RUDP_Bulk_Ver", sess->BulkOnRUDPVersion);
				}
			}

			sess->EnableHMacOnBulkOfRUDP = PackGetBool(p, "enable_hmac_on_bulk_of_rudp");
		}

		Debug("EnableBulkOnRUDP = %u\n", sess->EnableBulkOnRUDP);
		Debug("EnableHMacOnBulkOfRUDP = %u\n", sess->EnableHMacOnBulkOfRUDP);
		Debug("EnableUdpRecovery = %u\n", sess->EnableUdpRecovery);
		Debug("BulkOnRUDPVersion = %u\n", sess->BulkOnRUDPVersion);

		sess->UseUdpAcceleration = false;
		sess->IsUsingUdpAcceleration = false;
		sess->UseHMacOnUdpAcceleration = false;

		if (sess->UdpAccel != NULL)
		{
			sess->UdpAccel->UseHMac = false;

			sess->UdpAccelFastDisconnectDetect = false;

			if (PackGetBool(p, "use_udp_acceleration"))
			{
				UINT udp_acceleration_version = PackGetInt(p, "udp_acceleration_version");
				IP udp_acceleration_server_ip;

				if (udp_acceleration_version == 0)
				{
					udp_acceleration_version = 1;
				}

				sess->UdpAccelFastDisconnectDetect = PackGetBool(p, "udp_accel_fast_disconnect_detect");

				if (PackGetIp(p, "udp_acceleration_server_ip", &udp_acceleration_server_ip))
				{
					UINT udp_acceleration_server_port = PackGetInt(p, "udp_acceleration_server_port");

					if (IsZeroIp(&udp_acceleration_server_ip))
					{
						Copy(&udp_acceleration_server_ip, &s->RemoteIP, sizeof(IP));
					}

					if (udp_acceleration_server_port != 0)
					{
						UCHAR udp_acceleration_server_key[UDP_ACCELERATION_COMMON_KEY_SIZE_V1];
						UCHAR udp_acceleration_server_key_v2[UDP_ACCELERATION_COMMON_KEY_SIZE_V2];
						UINT server_cookie = PackGetInt(p, "udp_acceleration_server_cookie");
						UINT client_cookie = PackGetInt(p, "udp_acceleration_client_cookie");
						bool encryption = PackGetBool(p, "udp_acceleration_use_encryption");

						Zero(udp_acceleration_server_key, sizeof(udp_acceleration_server_key));
						Zero(udp_acceleration_server_key_v2, sizeof(udp_acceleration_server_key_v2));

						PackGetData2(p, "udp_acceleration_server_key", udp_acceleration_server_key, UDP_ACCELERATION_COMMON_KEY_SIZE_V1);
						PackGetData2(p, "udp_acceleration_server_key_v2", udp_acceleration_server_key_v2, UDP_ACCELERATION_COMMON_KEY_SIZE_V2);

						if (server_cookie != 0 && client_cookie != 0)
						{
							IP remote_ip;

							Copy(&remote_ip, &s->RemoteIP, sizeof(IP));

							if (IsZeroIp(&c->Session->AzureRealServerGlobalIp) == false)
							{
								Copy(&remote_ip, &c->Session->AzureRealServerGlobalIp, sizeof(IP));
							}

							sess->UdpAccel->Version = 1;
							if (udp_acceleration_version == 2)
							{
								sess->UdpAccel->Version = 2;
							}

							if (UdpAccelInitClient(sess->UdpAccel,
								sess->UdpAccel->Version == 2 ? udp_acceleration_server_key_v2 : udp_acceleration_server_key,
								&remote_ip, &udp_acceleration_server_ip, udp_acceleration_server_port,
								server_cookie, client_cookie) == false)
							{
								Debug("UdpAccelInitClient failed.\n");
							}
							else
							{
								sess->UseUdpAcceleration = true;

								sess->UdpAccel->FastDetect = sess->UdpAccelFastDisconnectDetect;

								sess->UdpAccel->PlainTextMode = !encryption;

								sess->UseHMacOnUdpAcceleration = PackGetBool(p, "use_hmac_on_udp_acceleration");

								if (sess->UseHMacOnUdpAcceleration)
								{
									sess->UdpAccel->UseHMac = true;
								}

								AddProtocolDetailsKeyValueInt(sess->ProtocolDetails, sizeof(sess->ProtocolDetails), "UDPAccel_Ver", sess->UdpAccel->Version);

								AddProtocolDetailsStr(sess->ProtocolDetails, sizeof(sess->ProtocolDetails), sess->UdpAccel->Version > 1 ? "ChaCha20-Poly1305" : "RC4");

								AddProtocolDetailsKeyValueInt(sess->ProtocolDetails, sizeof(sess->ProtocolDetails), "UDPAccel_MSS", UdpAccelCalcMss(sess->UdpAccel));
							}
						}
					}
				}
			}
		}
	}
	Unlock(c->Session->lock);

	Debug("UseUdpAcceleration = %u\n", sess->UseUdpAcceleration);

	if (sess->UseUdpAcceleration == false)
	{
		if (sess->UdpAccel != NULL)
		{
			FreeUdpAccel(sess->UdpAccel);
			sess->UdpAccel = NULL;
		}
	}

	Lock(c->lock);
	{
		if (c->Name != NULL)
		{
			Free(c->Name);
		}
		c->Name = CopyStr(connection_name);

		// Save the name of a cryptographic algorithm
		if (c->CipherName != NULL)
		{
			Free(c->CipherName);
		}

		c->CipherName = CopyStr(c->FirstSock->CipherName);

		if (c->SslVersion != NULL)
		{
			Free(c->SslVersion);
		}

		c->SslVersion = CopyStr(c->FirstSock->SslVersion);
	}
	Unlock(c->lock);

	Lock(c->Session->lock);
	{
		if (c->Session->Name != NULL)
		{
			Free(c->Session->Name);
		}
		c->Session->Name = CopyStr(session_name);

		c->Session->Policy = policy;
	}
	Unlock(c->Session->lock);

	// Discard the Welcome packet
	FreePack(p);
	p = NULL;


	// Connection establishment
	c->Session->ClientStatus = CLIENT_STATUS_ESTABLISHED;

	// Save the server certificate
	if (c->ServerX == NULL)
	{
		c->ServerX = CloneX(c->FirstSock->RemoteX);
	}

	PrintStatus(sess, _UU("STATUS_9"));
#ifdef OS_UNIX
	UnixVLanSetState(c->Session->ClientOption->DeviceName, true);
#endif
	// Shift the connection to the tunneling mode
	StartTunnelingMode(c);
	s = NULL;

	if (c->Session->HalfConnection)
	{
		// Processing in the case of half-connection
		TCPSOCK *ts = (TCPSOCK *)LIST_DATA(c->Tcp->TcpSockList, 0);
		ts->Direction = TCP_CLIENT_TO_SERVER;
	}

	PrintStatus(sess, L"free");

	CLog(c->Cedar->Client, "LC_CONNECT_2", c->Session->ClientOption->AccountName,
		session_name);

	if (c->Session->LinkModeClient && c->Session->Link != NULL)
	{
		HLog(c->Session->Link->Hub, "LH_CONNECT_2", c->Session->ClientOption->AccountName, session_name);
	}

	// Main routine of the session
	SessionMain(c->Session);

	ok = true;

	if (c->Err == ERR_USER_CANCEL)
	{
		ret = true;
	}

CLEANUP:
	c->FirstSock = NULL;

	if (sess->UdpAccel != NULL)
	{
		FreeUdpAccel(sess->UdpAccel);
		sess->UdpAccel = NULL;
	}

	if (p != NULL)
	{
		FreePack(p);
	}

	Disconnect(s);
	ReleaseSock(s);

	Debug("Error: %u\n", c->Err);

	if (ok == false)
	{
		PrintStatus(sess, L"free");
	}

	return ret;
}

// Parse the Welcome packet
bool ParseWelcomeFromPack(PACK *p, char *session_name, UINT session_name_size,
						  char *connection_name, UINT connection_name_size,
						  POLICY **policy)
{
	// Validate arguments
	if (p == NULL || session_name == NULL || connection_name == NULL || policy == NULL)
	{
		return false;
	}

	// Session name
	if (PackGetStr(p, "session_name", session_name, session_name_size) == false)
	{
		return false;
	}

	// Connection name
	if (PackGetStr(p, "connection_name", connection_name, connection_name_size) == false)
	{
		return false;
	}

	// Policy
	*policy = PackGetPolicy(p);
	if (*policy == NULL)
	{
		return false;
	}

	return true;
}

// Generate the Welcome packet
PACK *PackWelcome(SESSION *s)
{
	PACK *p;
	// Validate arguments
	if (s == NULL)
	{
		return NULL;
	}

	p = NewPack();

	// Session name
	PackAddStr(p, "session_name", s->Name);

	// Connection name
	PackAddStr(p, "connection_name", s->Connection->Name);

	// Parameters
	PackAddInt(p, "max_connection", s->MaxConnection);
	PackAddInt(p, "use_encrypt", s->UseEncrypt == false ? 0 : 1);
	PackAddInt(p, "use_compress", s->UseCompress == false ? 0 : 1);
	PackAddInt(p, "half_connection", s->HalfConnection == false ? 0 : 1);
	PackAddInt(p, "timeout", s->Timeout);
	PackAddInt(p, "qos", s->QoS ? 1 : 0);
	PackAddInt(p, "is_azure_session", s->IsAzureSession);

	// Session key
	PackAddData(p, "session_key", s->SessionKey, SHA1_SIZE);
	PackAddInt(p, "session_key_32", s->SessionKey32);

	// Policy
	PackAddPolicy(p, s->Policy);

	// VLAN ID
	PackAddInt(p, "vlan_id", s->VLanId);

	if (s->Connection->Protocol == CONNECTION_UDP)
	{
		// In the case of UDP protocol, generate 2 pairs of key
		Rand(s->UdpSendKey, sizeof(s->UdpSendKey));
		Rand(s->UdpRecvKey, sizeof(s->UdpRecvKey));

		// Send to client by exchanging 2 keys
		PackAddData(p, "udp_send_key", s->UdpRecvKey, sizeof(s->UdpRecvKey));
		PackAddData(p, "udp_recv_key", s->UdpSendKey, sizeof(s->UdpSendKey));
	}

	// no_send_signature
	if (s->NoSendSignature)
	{
		PackAddBool(p, "no_send_signature", true);
	}

	if (s->InProcMode)
	{
		// MAC address for IPC
		PackAddData(p, "IpcMacAddress", s->IpcMacAddress, 6);

		// Virtual HUB name
		PackAddStr(p, "IpcHubName", s->Hub->Name);

		// Shared Buffer
		s->IpcSessionSharedBuffer = NewSharedBuffer(NULL, sizeof(IPC_SESSION_SHARED_BUFFER_DATA));
		AddRef(s->IpcSessionSharedBuffer->Ref);

		s->IpcSessionShared = s->IpcSessionSharedBuffer->Data;

		PackAddInt64(p, "IpcSessionSharedBuffer", (UINT64)s->IpcSessionSharedBuffer);
	}

	if (s->UdpAccel != NULL)
	{
		// UDP acceleration function
		PackAddBool(p, "use_udp_acceleration", true);
		PackAddInt(p, "udp_acceleration_version", s->UdpAccel->Version);
		PackAddIp(p, "udp_acceleration_server_ip", &s->UdpAccel->MyIp);
		PackAddInt(p, "udp_acceleration_server_port", s->UdpAccel->MyPort);
		PackAddData(p, "udp_acceleration_server_key", s->UdpAccel->MyKey, sizeof(s->UdpAccel->MyKey));
		PackAddData(p, "udp_acceleration_server_key_v2", s->UdpAccel->MyKey_V2, sizeof(s->UdpAccel->MyKey_V2));
		PackAddInt(p, "udp_acceleration_server_cookie", s->UdpAccel->MyCookie);
		PackAddInt(p, "udp_acceleration_client_cookie", s->UdpAccel->YourCookie);
		PackAddBool(p, "udp_acceleration_use_encryption", !s->UdpAccel->PlainTextMode);
		PackAddBool(p, "use_hmac_on_udp_acceleration", s->UdpAccel->UseHMac);
		PackAddBool(p, "udp_accel_fast_disconnect_detect", s->UdpAccelFastDisconnectDetect);
	}

	if (s->EnableBulkOnRUDP)
	{
		// Allow bulk transfer on R-UDP
		PackAddBool(p, "enable_bulk_on_rudp", true);
		PackAddBool(p, "enable_hmac_on_bulk_of_rudp", s->EnableHMacOnBulkOfRUDP);
		PackAddInt(p, "rudp_bulk_version", s->BulkOnRUDPVersion);

		if (s->BulkOnRUDPVersion == 2)
		{
			PackAddData(p, "bulk_on_rudp_send_key", s->Connection->FirstSock->BulkRecvKey->Data, RUDP_BULK_KEY_SIZE_V2);
			s->Connection->FirstSock->BulkRecvKey->Size = RUDP_BULK_KEY_SIZE_V2;

			PackAddData(p, "bulk_on_rudp_recv_key", s->Connection->FirstSock->BulkSendKey->Data, RUDP_BULK_KEY_SIZE_V2);
			s->Connection->FirstSock->BulkSendKey->Size = RUDP_BULK_KEY_SIZE_V2;
		}
		else
		{
			PackAddData(p, "bulk_on_rudp_send_key", s->Connection->FirstSock->BulkRecvKey->Data, SHA1_SIZE);
			s->Connection->FirstSock->BulkRecvKey->Size = SHA1_SIZE;

			PackAddData(p, "bulk_on_rudp_recv_key", s->Connection->FirstSock->BulkSendKey->Data, SHA1_SIZE);
			s->Connection->FirstSock->BulkSendKey->Size = SHA1_SIZE;
		}

		// Backup R-UDP bulk send/recv keys for additional connections
		Copy(s->BulkSendKey, s->Connection->FirstSock->BulkSendKey->Data,
			s->Connection->FirstSock->BulkSendKey->Size);

		s->BulkSendKeySize = s->Connection->FirstSock->BulkSendKey->Size;

		Copy(s->BulkRecvKey, s->Connection->FirstSock->BulkRecvKey->Data,
			s->Connection->FirstSock->BulkRecvKey->Size);

		s->BulkRecvKeySize = s->Connection->FirstSock->BulkRecvKey->Size;
	}

	if (s->IsAzureSession)
	{
		if (s->Connection != NULL && s->Connection->FirstSock != NULL)
		{
			SOCK *sock = s->Connection->FirstSock;

			PackAddIp(p, "azure_real_server_global_ip", &sock->Reverse_MyServerGlobalIp);
		}
	}

	PackAddBool(p, "enable_udp_recovery", s->EnableUdpRecovery);

	return p;
}

#define	PACK_ADD_POLICY_BOOL(name, value)	\
	PackAddBool(p, "policy:" name, y->value == false ? 0 : 1)
#define	PACK_ADD_POLICY_UINT(name, value)	\
	PackAddInt(p, "policy:" name, y->value)
#define	PACK_GET_POLICY_BOOL(name, value)	\
	y->value = (PackGetBool(p, "policy:" name))
#define	PACK_GET_POLICY_UINT(name, value)	\
	y->value = PackGetInt(p, "policy:" name)

// Get a PACK from the session key
bool GetSessionKeyFromPack(PACK *p, UCHAR *session_key, UINT *session_key_32)
{
	// Validate arguments
	if (p == NULL || session_key == NULL || session_key_32 == NULL)
	{
		return false;
	}

	if (PackGetDataSize(p, "session_key") != SHA1_SIZE)
	{
		return false;
	}
	if (PackGetData(p, "session_key", session_key) == false)
	{
		return false;
	}
	*session_key_32 = PackGetInt(p, "session_key_32");

	return true;
}

// Get the policy from the PACK
POLICY *PackGetPolicy(PACK *p)
{
	POLICY *y;
	// Validate arguments
	if (p == NULL)
	{
		return NULL;
	}

	y = ZeroMalloc(sizeof(POLICY));

	// Bool value
	// Ver 2
	PACK_GET_POLICY_BOOL("Access", Access);
	PACK_GET_POLICY_BOOL("DHCPFilter", DHCPFilter);
	PACK_GET_POLICY_BOOL("DHCPNoServer", DHCPNoServer);
	PACK_GET_POLICY_BOOL("DHCPForce", DHCPForce);
	PACK_GET_POLICY_BOOL("NoBridge", NoBridge);
	PACK_GET_POLICY_BOOL("NoRouting", NoRouting);
	PACK_GET_POLICY_BOOL("PrivacyFilter", PrivacyFilter);
	PACK_GET_POLICY_BOOL("NoServer", NoServer);
	PACK_GET_POLICY_BOOL("CheckMac", CheckMac);
	PACK_GET_POLICY_BOOL("CheckIP", CheckIP);
	PACK_GET_POLICY_BOOL("ArpDhcpOnly", ArpDhcpOnly);
	PACK_GET_POLICY_BOOL("MonitorPort", MonitorPort);
	PACK_GET_POLICY_BOOL("NoBroadcastLimiter", NoBroadcastLimiter);
	PACK_GET_POLICY_BOOL("FixPassword", FixPassword);
	PACK_GET_POLICY_BOOL("NoQoS", NoQoS);
	// Ver 3
	PACK_GET_POLICY_BOOL("RSandRAFilter", RSandRAFilter);
	PACK_GET_POLICY_BOOL("RAFilter", RAFilter);
	PACK_GET_POLICY_BOOL("DHCPv6Filter", DHCPv6Filter);
	PACK_GET_POLICY_BOOL("DHCPv6NoServer", DHCPv6NoServer);
	PACK_GET_POLICY_BOOL("NoRoutingV6", NoRoutingV6);
	PACK_GET_POLICY_BOOL("CheckIPv6", CheckIPv6);
	PACK_GET_POLICY_BOOL("NoServerV6", NoServerV6);
	PACK_GET_POLICY_BOOL("NoSavePassword", NoSavePassword);
	PACK_GET_POLICY_BOOL("FilterIPv4", FilterIPv4);
	PACK_GET_POLICY_BOOL("FilterIPv6", FilterIPv6);
	PACK_GET_POLICY_BOOL("FilterNonIP", FilterNonIP);
	PACK_GET_POLICY_BOOL("NoIPv6DefaultRouterInRA", NoIPv6DefaultRouterInRA);
	PACK_GET_POLICY_BOOL("NoIPv6DefaultRouterInRAWhenIPv6", NoIPv6DefaultRouterInRAWhenIPv6);

	// UINT value
	// Ver 2
	PACK_GET_POLICY_UINT("MaxConnection", MaxConnection);
	PACK_GET_POLICY_UINT("TimeOut", TimeOut);
	PACK_GET_POLICY_UINT("MaxMac", MaxMac);
	PACK_GET_POLICY_UINT("MaxIP", MaxIP);
	PACK_GET_POLICY_UINT("MaxUpload", MaxUpload);
	PACK_GET_POLICY_UINT("MaxDownload", MaxDownload);
	PACK_GET_POLICY_UINT("MultiLogins", MultiLogins);
	// Ver 3
	PACK_GET_POLICY_UINT("MaxIPv6", MaxIPv6);
	PACK_GET_POLICY_UINT("AutoDisconnect", AutoDisconnect);
	PACK_GET_POLICY_UINT("VLanId", VLanId);

	// Ver 3 flag
	PACK_GET_POLICY_BOOL("Ver3", Ver3);

	return y;
}

// Insert the policy into the PACK
void PackAddPolicy(PACK *p, POLICY *y)
{
	// Validate arguments
	if (p == NULL || y == NULL)
	{
		return;
	}

	// Bool value
	// Ver 2
	PACK_ADD_POLICY_BOOL("Access", Access);
	PACK_ADD_POLICY_BOOL("DHCPFilter", DHCPFilter);
	PACK_ADD_POLICY_BOOL("DHCPNoServer", DHCPNoServer);
	PACK_ADD_POLICY_BOOL("DHCPForce", DHCPForce);
	PACK_ADD_POLICY_BOOL("NoBridge", NoBridge);
	PACK_ADD_POLICY_BOOL("NoRouting", NoRouting);
	PACK_ADD_POLICY_BOOL("PrivacyFilter", PrivacyFilter);
	PACK_ADD_POLICY_BOOL("NoServer", NoServer);
	PACK_ADD_POLICY_BOOL("CheckMac", CheckMac);
	PACK_ADD_POLICY_BOOL("CheckIP", CheckIP);
	PACK_ADD_POLICY_BOOL("ArpDhcpOnly", ArpDhcpOnly);
	PACK_ADD_POLICY_BOOL("MonitorPort", MonitorPort);
	PACK_ADD_POLICY_BOOL("NoBroadcastLimiter", NoBroadcastLimiter);
	PACK_ADD_POLICY_BOOL("FixPassword", FixPassword);
	PACK_ADD_POLICY_BOOL("NoQoS", NoQoS);
	// Ver 3
	PACK_ADD_POLICY_BOOL("RSandRAFilter", RSandRAFilter);
	PACK_ADD_POLICY_BOOL("RAFilter", RAFilter);
	PACK_ADD_POLICY_BOOL("DHCPv6Filter", DHCPv6Filter);
	PACK_ADD_POLICY_BOOL("DHCPv6NoServer", DHCPv6NoServer);
	PACK_ADD_POLICY_BOOL("NoRoutingV6", NoRoutingV6);
	PACK_ADD_POLICY_BOOL("CheckIPv6", CheckIPv6);
	PACK_ADD_POLICY_BOOL("NoServerV6", NoServerV6);
	PACK_ADD_POLICY_BOOL("NoSavePassword", NoSavePassword);
	PACK_ADD_POLICY_BOOL("FilterIPv4", FilterIPv4);
	PACK_ADD_POLICY_BOOL("FilterIPv6", FilterIPv6);
	PACK_ADD_POLICY_BOOL("FilterNonIP", FilterNonIP);
	PACK_ADD_POLICY_BOOL("NoIPv6DefaultRouterInRA", NoIPv6DefaultRouterInRA);
	PACK_ADD_POLICY_BOOL("NoIPv6DefaultRouterInRAWhenIPv6", NoIPv6DefaultRouterInRAWhenIPv6);

	// UINT value
	// Ver 2
	PACK_ADD_POLICY_UINT("MaxConnection", MaxConnection);
	PACK_ADD_POLICY_UINT("TimeOut", TimeOut);
	PACK_ADD_POLICY_UINT("MaxMac", MaxMac);
	PACK_ADD_POLICY_UINT("MaxIP", MaxIP);
	PACK_ADD_POLICY_UINT("MaxUpload", MaxUpload);
	PACK_ADD_POLICY_UINT("MaxDownload", MaxDownload);
	PACK_ADD_POLICY_UINT("MultiLogins", MultiLogins);
	// Ver 3
	PACK_ADD_POLICY_UINT("MaxIPv6", MaxIPv6);
	PACK_ADD_POLICY_UINT("AutoDisconnect", AutoDisconnect);
	PACK_ADD_POLICY_UINT("VLanId", VLanId);

	// Ver 3 flag
	PackAddBool(p, "policy:Ver3", true);
}

// Upload the authentication data for the additional connection
bool ClientUploadAuth2(CONNECTION *c, SOCK *s)
{
	PACK *p = NULL;
	// Validate arguments
	if (c == NULL)
	{
		return false;
	}

	p = PackAdditionalConnect(c->Session->SessionKey);

	PackAddClientVersion(p, c);

	if (HttpClientSend(s, p) == false)
	{
		FreePack(p);
		return false;
	}
	FreePack(p);

	return true;
}

// Send a NOOP
void ClientUploadNoop(CONNECTION *c)
{
	PACK *p;
	// Validate arguments
	if (c == NULL)
	{
		return;
	}

	p = PackError(0);
	PackAddInt(p, "noop", 1);
	(void)HttpClientSend(c->FirstSock, p);
	FreePack(p);

	p = HttpClientRecv(c->FirstSock);
	if (p != NULL)
	{
		FreePack(p);
	}
}

// Add client version information to the PACK
void PackAddClientVersion(PACK *p, CONNECTION *c)
{
	// Validate arguments
	if (p == NULL || c == NULL)
	{
		return;
	}

	PackAddStr(p, "client_str", c->ClientStr);
	PackAddInt(p, "client_ver", c->ClientVer);
	PackAddInt(p, "client_build", c->ClientBuild);
}

// Upload the certificate data for the new connection
bool ClientUploadAuth(CONNECTION *c)
{
	PACK *p = NULL;
	CLIENT_AUTH *a;
	CLIENT_OPTION *o;
	X *x;
	bool ret;
	NODE_INFO info;
	UCHAR secure_password[SHA1_SIZE];
	UCHAR sign[4096 / 8];
	UCHAR unique[SHA1_SIZE];
	RPC_WINVER v;
	// Validate arguments
	if (c == NULL)
	{
		return false;
	}

	Zero(sign, sizeof(sign));

	a = c->Session->ClientAuth;
	o = c->Session->ClientOption;

	if (c->UseTicket == false)
	{
		switch (a->AuthType)
		{
		case CLIENT_AUTHTYPE_ANONYMOUS:
			// Anonymous authentication
			p = PackLoginWithAnonymous(o->HubName, a->Username);
			break;

		case CLIENT_AUTHTYPE_PASSWORD:
			// Password authentication
			SecurePassword(secure_password, a->HashedPassword, c->Random);
			p = PackLoginWithPassword(o->HubName, a->Username, secure_password);
			break;

		case CLIENT_AUTHTYPE_PLAIN_PASSWORD:
			// Plaintext password authentication
			p = PackLoginWithPlainPassword(o->HubName, a->Username, a->PlainPassword);
			break;

		case CLIENT_AUTHTYPE_CERT:
			// Certificate authentication
			if (a->ClientX != NULL && a->ClientX->is_compatible_bit &&
				a->ClientX->bits != 0 && (a->ClientX->bits / 8) <= sizeof(sign))
			{
				if (RsaSignEx(sign, c->Random, SHA1_SIZE, a->ClientK, a->ClientX->bits))
				{
					p = PackLoginWithCert(o->HubName, a->Username, a->ClientX, sign, a->ClientX->bits / 8);
					c->ClientX = CloneX(a->ClientX);
				}
			}
			break;

		case CLIENT_AUTHTYPE_OPENSSLENGINE:
			// Certificate authentication
			if (a->ClientX != NULL && a->ClientX->is_compatible_bit &&
				a->ClientX->bits != 0 && (a->ClientX->bits / 8) <= sizeof(sign))
			{
				if (RsaSignEx(sign, c->Random, SHA1_SIZE, a->ClientK, a->ClientX->bits))
				{
					p = PackLoginWithCert(o->HubName, a->Username, a->ClientX, sign, a->ClientX->bits / 8);
					c->ClientX = CloneX(a->ClientX);
				}
			}
			break;


		case CLIENT_AUTHTYPE_SECURE:
			// Authentication by secure device
			if (ClientSecureSign(c, sign, c->Random, &x))
			{
				p = PackLoginWithCert(o->HubName, a->Username, x, sign, x->bits / 8);
				c->ClientX = CloneX(x);
				FreeX(x);
			}
			else
			{
				c->Err = ERR_SECURE_DEVICE_OPEN_FAILED;
				c->Session->ForceStopFlag = true;
			}
			break;
		}
	}
	else
	{
		// Ticket
		p = NewPack();
		PackAddStr(p, "method", "login");
		PackAddStr(p, "hubname", o->HubName);
		PackAddStr(p, "username", a->Username);
		PackAddInt(p, "authtype", AUTHTYPE_TICKET);
		PackAddData(p, "ticket", c->Ticket, SHA1_SIZE);
	}

	if (p == NULL)
	{
		// Error
		if (c->Err != ERR_SECURE_DEVICE_OPEN_FAILED)
		{
			c->Err = ERR_PROTOCOL_ERROR;
		}
		return false;
	}

	PackAddClientVersion(p, c);

	// Protocol
	PackAddInt(p, "protocol", c->Protocol);

	// Version, etc.
	PackAddStr(p, "hello", c->ClientStr);
	PackAddInt(p, "version", c->ClientVer);
	PackAddInt(p, "build", c->ClientBuild);
	PackAddInt(p, "client_id", c->Cedar->ClientId);

	// The maximum number of connections
	PackAddInt(p, "max_connection", o->MaxConnection);
	// Flag to use of cryptography
	PackAddInt(p, "use_encrypt", o->UseEncrypt == false ? 0 : 1);
	// Data compression flag
	PackAddInt(p, "use_compress", o->UseCompress == false ? 0 : 1);
	// Half connection flag
	PackAddInt(p, "half_connection", o->HalfConnection == false ? 0 : 1);

	// Bridge / routing mode flag
	PackAddBool(p, "require_bridge_routing_mode", o->RequireBridgeRoutingMode);

	// Monitor mode flag
	PackAddBool(p, "require_monitor_mode", o->RequireMonitorMode);

	// VoIP / QoS flag
	PackAddBool(p, "qos", o->DisableQoS ? false : true);

	// Bulk transfer support
	PackAddBool(p, "support_bulk_on_rudp", true);
	PackAddBool(p, "support_hmac_on_bulk_of_rudp", true);

	// UDP recovery support
	PackAddBool(p, "support_udp_recovery", true);

	// Unique ID
	GenerateMachineUniqueHash(unique);
	PackAddData(p, "unique_id", unique, SHA1_SIZE);

	// UDP acceleration function using flag
	if (o->NoUdpAcceleration == false && c->Session->UdpAccel != NULL)
	{
		PackAddBool(p, "use_udp_acceleration", true);

		PackAddInt(p, "udp_acceleration_version", c->Session->UdpAccel->Version);

		IP my_ip;
		if (IsLocalHostIP(&c->Session->UdpAccel->MyIp) == false)
		{
			Copy(&my_ip, &c->Session->UdpAccel->MyIp, sizeof(my_ip));
		}
		else
		{
			Zero(&my_ip, sizeof(my_ip));
		}

		PackAddIp(p, "udp_acceleration_client_ip", &my_ip);
		PackAddInt(p, "udp_acceleration_client_port", c->Session->UdpAccel->MyPort);
		PackAddData(p, "udp_acceleration_client_key", c->Session->UdpAccel->MyKey, UDP_ACCELERATION_COMMON_KEY_SIZE_V1);
		PackAddData(p, "udp_acceleration_client_key_v2", c->Session->UdpAccel->MyKey_V2, UDP_ACCELERATION_COMMON_KEY_SIZE_V2);
		PackAddBool(p, "support_hmac_on_udp_acceleration", true);
		PackAddBool(p, "support_udp_accel_fast_disconnect_detect", true);
		PackAddInt(p, "udp_acceleration_max_version", 2);
	}

	PackAddInt(p, "rudp_bulk_max_version", 2);

	// Brand string for the connection limit
	{
		char *branded_ctos = _SS("BRANDED_C_TO_S");
		if(StrLen(branded_ctos) > 0)
		{
			PackAddStr(p, "branded_ctos", branded_ctos);
		}
	}

	// Node information
	CreateNodeInfo(&info, c);
	OutRpcNodeInfo(p, &info);

	// OS information
	GetWinVer(&v);
	OutRpcWinVer(p, &v);

	ret = HttpClientSend(c->FirstSock, p);
	if (ret == false)
	{
		c->Err = ERR_DISCONNECTED;
	}

	FreePack(p);

	return ret;
}

// Upload the Hello packet
bool ServerUploadHello(CONNECTION *c)
{
	PACK *p;
	// Validate arguments
	if (c == NULL)
	{
		return false;
	}

	// Random number generation
	Rand(c->Random, SHA1_SIZE);

	p = PackHello(c->Random, c->ServerVer, c->ServerBuild, c->ServerStr);
	if (HttpServerSend(c->FirstSock, p) == false)
	{
		FreePack(p);
		c->Err = ERR_DISCONNECTED;
		return false;
	}

	FreePack(p);

	return true;
}

// Download the Hello packet
bool ClientDownloadHello(CONNECTION *c, SOCK *s)
{
	PACK *p;
	UINT err;
	UCHAR random[SHA1_SIZE];
	// Validate arguments
	if (c == NULL)
	{
		return false;
	}

	// Data reception
	p = HttpClientRecv(s);
	if (p == NULL)
	{
		c->Err = ERR_SERVER_IS_NOT_VPN;
		return false;
	}

	if (err = GetErrorFromPack(p))
	{
		// An error has occured
		c->Err = err;
		FreePack(p);
		return false;
	}

	// Packet interpretation
	if (GetHello(p, random, &c->ServerVer, &c->ServerBuild, c->ServerStr, sizeof(c->ServerStr)) == false)
	{
		c->Err = ERR_SERVER_IS_NOT_VPN;
		FreePack(p);
		return false;
	}

	if (c->FirstSock == s)
	{
		Copy(c->Random, random, SHA1_SIZE);
	}

	FreePack(p);

	return true;
}

// Download the signature
bool ServerDownloadSignature(CONNECTION *c, char **error_detail_str)
{
	HTTP_HEADER *h;
	UCHAR *data;
	UINT data_size;
	SOCK *s;
	UINT num = 0, max = 19;
	SERVER *server;
	char *vpn_http_target = HTTP_VPN_TARGET2;
	// Validate arguments
	if (c == NULL)
	{
		return false;
	}

	server = c->Cedar->Server;

	s = c->FirstSock;

	while (true)
	{
		bool not_found_error = false;

		num++;
		if (num > max)
		{
			// Disconnect
			Disconnect(s);
			c->Err = ERR_CLIENT_IS_NOT_VPN;

			*error_detail_str = "HTTP_TOO_MANY_REQUEST";
			return false;
		}
		// Receive a header
		h = RecvHttpHeader(s);
		if (h == NULL)
		{
			c->Err = ERR_CLIENT_IS_NOT_VPN;
			if (c->IsJsonRpc)
			{
				c->Err = ERR_DISCONNECTED;
			}
			return false;
		}

		// Interpret
		if (StrCmpi(h->Method, "POST") == 0)
		{
			// Receive the data since it's POST
			data_size = GetContentLength(h);

			if (server->DisableJsonRpcWebApi == false)
			{
				if (StrCmpi(h->Target, "/api") == 0 || StrCmpi(h->Target, "/api/") == 0)
				{
					c->IsJsonRpc = true;
					c->Type = CONNECTION_TYPE_ADMIN_RPC;

					JsonRpcProcPost(c, s, h, data_size);

					FreeHttpHeader(h);

					if (c->JsonRpcAuthed)
					{
						num = 0;
					}

					continue;
				}
				else if (StartWith(h->Target, "/admin"))
				{
					c->IsJsonRpc = true;
					c->Type = CONNECTION_TYPE_ADMIN_RPC;

					AdminWebProcPost(c, s, h, data_size, h->Target);

					FreeHttpHeader(h);

					if (c->JsonRpcAuthed)
					{
						num = 0;
					}

					continue;
				}
			}

			if ((data_size > MAX_WATERMARK_SIZE || data_size < SizeOfWaterMark()) && (data_size != StrLen(HTTP_VPN_TARGET_POSTDATA)))
			{
				// Data is too large
				HttpSendForbidden(s, h->Target, NULL);
				FreeHttpHeader(h);
				c->Err = ERR_CLIENT_IS_NOT_VPN;
				*error_detail_str = "POST_Recv_TooLong";
				return false;
			}
			data = Malloc(data_size);
			if (RecvAll(s, data, data_size, s->SecureMode) == false)
			{
				// Data reception failure
				Free(data);
				FreeHttpHeader(h);
				c->Err = ERR_DISCONNECTED;
				*error_detail_str = "POST_Recv_Failed";
				return false;
			}
			// Check the Target
			if ((StrCmpi(h->Target, vpn_http_target) != 0) || not_found_error)
			{
				// Target is invalid
				HttpSendNotFound(s, h->Target);
				Free(data);
				FreeHttpHeader(h);
				*error_detail_str = "POST_Target_Wrong";
			}
			else
			{
				// Compare posted data with the WaterMark
				if ((data_size == StrLen(HTTP_VPN_TARGET_POSTDATA) && (Cmp(data, HTTP_VPN_TARGET_POSTDATA, data_size) == 0))
					|| ((data_size >= SizeOfWaterMark()) && Cmp(data, WaterMark, SizeOfWaterMark()) == 0))
				{
					// Check the WaterMark
					Free(data);
					FreeHttpHeader(h);
					return true;
				}
				else
				{
					// WaterMark is incorrect
					HttpSendForbidden(s, h->Target, NULL);
					FreeHttpHeader(h);
					*error_detail_str = "POST_WaterMark_Error";
				}
			}
		}
		else if (StrCmpi(h->Method, "OPTIONS") == 0)
		{
			if (server->DisableJsonRpcWebApi == false)
			{
				if (StrCmpi(h->Target, "/api") == 0 || StrCmpi(h->Target, "/api/") == 0 || StartWith(h->Target, "/admin"))
				{
					c->IsJsonRpc = true;
					c->Type = CONNECTION_TYPE_ADMIN_RPC;

					JsonRpcProcOptions(c, s, h, h->Target);

					FreeHttpHeader(h);

					num = 0;

					continue;
				}
			}
		}
		else if (StrCmpi(h->Method, "SSTP_DUPLEX_POST") == 0 && (ProtoEnabled(server->Proto, "SSTP") || s->IsReverseAcceptedSocket) && GetServerCapsBool(server, "b_support_sstp"))
		{
			// SSTP client is connected
			c->WasSstp = true;

			if (StrCmpi(h->Target, SSTP_URI) == 0)
			{
				bool sstp_ret;
				// Accept the SSTP connection
				c->Type = CONNECTION_TYPE_OTHER;

				sstp_ret = ProtoHandleConnection(server->Proto, s, "SSTP");

				c->Err = ERR_DISCONNECTED;
				FreeHttpHeader(h);

				if (sstp_ret)
				{
					*error_detail_str = "";
				}
				else
				{
					*error_detail_str = "SSTP_ABORT";
				}

				return false;
			}
			else
			{
				// URI is invalid
				HttpSendNotFound(s, h->Target);
				*error_detail_str = "SSTP_URL_WRONG";
			}

			FreeHttpHeader(h);
		}
		else
		{
			// This should not be a VPN client, but interpret a bit more
			if (StrCmpi(h->Method, "GET") != 0 && StrCmpi(h->Method, "HEAD") != 0
				 && StrCmpi(h->Method, "POST") != 0)
			{
				// Unsupported method calls
				HttpSendNotImplemented(s, h->Method, h->Target, h->Version);
				*error_detail_str = "HTTP_BAD_METHOD";
			}
			else
			{
				if (StrCmpi(h->Target, "/") == 0)
				{
					// Root directory
					BUF *b = NULL;
					*error_detail_str = "HTTP_ROOT";

					if (server->DisableJsonRpcWebApi == false)
					{
						b = ReadDump("|wwwroot/index.html");
					}

					if (b != NULL)
					{
						FreeHttpHeader(h);
						h = NewHttpHeader("HTTP/1.1", "202", "OK");
						AddHttpValue(h, NewHttpValue("Content-Type", HTTP_CONTENT_TYPE4));
						AddHttpValue(h, NewHttpValue("Connection", "Keep-Alive"));
						AddHttpValue(h, NewHttpValue("Keep-Alive", HTTP_KEEP_ALIVE));

						PostHttp(c->FirstSock, h, b->Buf, b->Size);

						FreeBuf(b);
					}
					else
					{
						HttpSendForbidden(c->FirstSock, h->Target, "");
					}
				}
				else
				{
					bool b = false;

					// Show the WebUI if the configuration allow to use the WebUI
					if (c->Cedar->Server != NULL && c->Cedar->Server->UseWebUI)
					{
						WU_WEBPAGE *page;

						// Show the WebUI
						page = WuGetPage(h->Target, c->Cedar->WebUI);

						if (page != NULL)
						{
							PostHttp(s, page->header, page->data, page->size);
							b = true;
							WuFreeWebPage(page);
						}

					}

					if (IsLocalHostIP(&c->FirstSock->RemoteIP))
					{
						if (StrCmpi(h->Target, HTTP_SAITAMA) == 0)
						{
							// Saitama (joke)
							FreeHttpHeader(h);
							h = NewHttpHeader("HTTP/1.1", "202", "OK");
							AddHttpValue(h, NewHttpValue("Content-Type", HTTP_CONTENT_TYPE3));
							AddHttpValue(h, NewHttpValue("Connection", "Keep-Alive"));
							AddHttpValue(h, NewHttpValue("Keep-Alive", HTTP_KEEP_ALIVE));
							PostHttp(s, h, Saitama, SizeOfSaitama());
							b = true;
						}
						else if (StartWith(h->Target, HTTP_PICTURES))
						{
							BUF *buf;

							// Lots of photos
							buf = ReadDump("|Pictures.mht");

							if (buf != NULL)
							{
								FreeHttpHeader(h);
								h = NewHttpHeader("HTTP/1.1", "202", "OK");
								AddHttpValue(h, NewHttpValue("Content-Type", HTTP_CONTENT_TYPE5));
								AddHttpValue(h, NewHttpValue("Connection", "Keep-Alive"));
								AddHttpValue(h, NewHttpValue("Keep-Alive", HTTP_KEEP_ALIVE));
								PostHttp(s, h, buf->Buf, buf->Size);
								b = true;

								FreeBuf(buf);
							}
						}
					}

					if (b == false)
					{
						if (server->DisableJsonRpcWebApi == false)
						{
							if (StartWith(h->Target, "/api?") || StartWith(h->Target, "/api/") || StrCmpi(h->Target, "/api") == 0)
							{
								c->IsJsonRpc = true;
								c->Type = CONNECTION_TYPE_ADMIN_RPC;

								JsonRpcProcGet(c, s, h, h->Target);

								if (c->JsonRpcAuthed)
								{
									num = 0;
								}

								FreeHttpHeader(h);

								continue;
							}
							else if (StartWith(h->Target, "/admin"))
							{
								c->IsJsonRpc = true;
								c->Type = CONNECTION_TYPE_ADMIN_RPC;

								AdminWebProcGet(c, s, h, h->Target);

								if (c->JsonRpcAuthed)
								{
									num = 0;
								}

								FreeHttpHeader(h);

								continue;
							}
						}
					}

					if (b == false)
					{
						// Not Found
						HttpSendNotFound(s, h->Target);

						*error_detail_str = "HTTP_NOT_FOUND";
					}
				}
			}
			FreeHttpHeader(h);
		}
	}
}

// Upload a signature
bool ClientUploadSignature(SOCK *s)
{
	HTTP_HEADER *h;
	UINT water_size, rand_size;
	UCHAR *water;
	char ip_str[128];
	// Validate arguments
	if (s == NULL)
	{
		return false;
	}

	IPToStr(ip_str, sizeof(ip_str), &s->RemoteIP);

	h = NewHttpHeader("POST", HTTP_VPN_TARGET2, "HTTP/1.1");
	AddHttpValue(h, NewHttpValue("Host", ip_str));
	AddHttpValue(h, NewHttpValue("Content-Type", HTTP_CONTENT_TYPE3));
	AddHttpValue(h, NewHttpValue("Connection", "Keep-Alive"));



	// Generate a watermark
	rand_size = Rand32() % (HTTP_PACK_RAND_SIZE_MAX * 2);
	water_size = SizeOfWaterMark() + rand_size;
	water = Malloc(water_size);
	Copy(water, WaterMark, SizeOfWaterMark());
	Rand(&water[SizeOfWaterMark()], rand_size);

	// Upload the watermark data
	if (PostHttp(s, h, water, water_size) == false)
	{
		Free(water);
		FreeHttpHeader(h);
		return false;
	}

	Free(water);
	FreeHttpHeader(h);

	return true;
}

// Establish a connection to the server
SOCK *ClientConnectToServer(CONNECTION *c)
{
	SOCK *s = NULL;
	X *x = NULL;
	K *k = NULL;
	// Validate arguments
	if (c == NULL)
	{
		return NULL;
	}

	if (c->Halt)
	{
		c->Err = ERR_USER_CANCEL;
		return NULL;
	}

	// Get the socket by connecting
	s = ClientConnectGetSocket(c, false);
	if (s == NULL)
	{
		// Connection failure
		return NULL;
	}

	c->FirstSock = s;

	if (c->Halt)
	{
		c->Err = ERR_USER_CANCEL;
		ReleaseSock(s);
		c->FirstSock = NULL;
		return NULL;
	}

	// Time-out
	SetTimeout(s, CONNECTING_TIMEOUT);

	// Start the SSL communication
	UINT err = 0;
	if (StartSSLEx3(s, x, k, NULL, 0, c->ServerName, c->Session->SslOption, &err) == false)
	{
		// SSL communication start failure
		Disconnect(s);
		ReleaseSock(s);
		c->FirstSock = NULL;
		if (err != 0)
		{
			c->Err = err;
		}
		else
		{
			c->Err = ERR_SERVER_IS_NOT_VPN;
		}
		return NULL;
	}

	if (err != 0)
	{
		c->Err = err;
	}

	if (s->RemoteX == NULL)
	{
		// SSL communication start failure
		Disconnect(s);
		ReleaseSock(s);
		c->FirstSock = NULL;
		c->Err = ERR_SERVER_IS_NOT_VPN;
		return NULL;
	}

	CLog(c->Cedar->Client, "LC_SSL_CONNECTED", c->Session->ClientOption->AccountName,	s->SslVersion, s->CipherName);

	return s;
}

// Return a socket by connecting to the server
SOCK *ClientConnectGetSocket(CONNECTION *c, bool additional_connect)
{
	volatile bool *cancel_flag = NULL;
	char hostname[MAX_HOST_NAME_LEN];
	bool save_resolved_ip = false;
	CLIENT_OPTION *o;
	SESSION *sess;
	SOCK *sock = NULL;
	IP resolved_ip;
	// Validate arguments
	if (c == NULL || c->Session == NULL || c->Session->ClientOption == NULL)
	{
		return NULL;
	}

	cancel_flag = &c->Halt;
	sess = c->Session;
	o = c->Session->ClientOption;

	Zero(&resolved_ip, sizeof(resolved_ip));

	if (additional_connect == false && c->RestoreServerNameAndPort)
	{
		// Update server name and port number.
		// At the time of writing this comment RestoreServerNameAndPort is never true.
		c->RestoreServerNameAndPort = false;

		if (StrCmpi(c->ServerName, o->Hostname) != 0)
		{
			StrCpy(c->ServerName, sizeof(c->ServerName), o->Hostname);
		}

		c->ServerPort = o->Port;
	}

	if (additional_connect && IsZeroIP(&sess->ServerIP_CacheForNextConnect) == false)
	{
		IPToStr(hostname, sizeof(hostname), &sess->ServerIP_CacheForNextConnect);
		Debug("ClientConnectGetSocket(): Using cached IP address %s\n", hostname);
	}
	else
	{
		IP tmp;

		StrCpy(hostname, sizeof(hostname), o->ProxyType == PROXY_DIRECT ? c->ServerName : o->ProxyName);

		if (StrToIP(&tmp, hostname) == false)
		{
			// The hostname is not an IP address
			save_resolved_ip = true;
		}
	}

	if (o->ProxyType == PROXY_DIRECT)
	{
		UINT ssl_err = 0;
		UINT nat_t_err = 0;
		wchar_t tmp[MAX_SIZE];
		UniFormat(tmp, sizeof(tmp), _UU("STATUS_4"), hostname);
		PrintStatus(sess, tmp);

		if (o->PortUDP == 0)
		{
			// If additional_connect == false, enable trying to NAT-T connection
			// If additional_connect == true, follow the IsRUDPSession setting in this session
			// In additional connect or redirect we do not need ssl verification as the certificate is always compared with a saved one
			sock = TcpIpConnectEx2(hostname, c->ServerPort,
				(bool *)cancel_flag, c->hWndForUI, &nat_t_err, (additional_connect ? (!sess->IsRUDPSession) : false),
				true, ((additional_connect || c->UseTicket) ? NULL : sess->SslOption), &ssl_err, o->HintStr, &resolved_ip);
		}
		else
		{
			// Mode to connect with R-UDP directly without using NAT-T server when using UDP
			IP ip;
			if (StrToIP(&ip, hostname))
			{
				sock = NewRUDPClientDirect(VPN_RUDP_SVC_NAME, &ip, o->PortUDP, &nat_t_err,
					TIMEOUT_TCP_PORT_CHECK, (bool *)cancel_flag, NULL, NULL, 0, false);

				if (sock != NULL)
				{
					StrCpy(sock->UnderlayProtocol, sizeof(sock->UnderlayProtocol), SOCK_UNDERLAY_NAT_T);
				}
			}
		}

		if (sock == NULL)
		{
			// Connection failure
			if (nat_t_err != RUDP_ERROR_NAT_T_TWO_OR_MORE)
			{
				if (ssl_err != 0)
				{
					c->Err = ssl_err;
				}
				else
				{
					c->Err = ERR_CONNECT_FAILED;
				}
			}
			else
			{
				c->Err = ERR_NAT_T_TWO_OR_MORE;
			}

			return NULL;
		}

		if (ssl_err != 0)
		{
			c->Err = ssl_err;
		}
	}
	else
	{
		wchar_t tmp[MAX_SIZE];
		PROXY_PARAM_OUT out;
		PROXY_PARAM_IN in;
		UINT ret;

		Zero(&in, sizeof(in));

		in.Timeout = 0;

		StrCpy(in.TargetHostname, sizeof(in.TargetHostname), c->ServerName);
		in.TargetPort = c->ServerPort;

		StrCpy(in.Hostname, sizeof(in.Hostname), IsEmptyStr(hostname) ? o->ProxyName : hostname);
		in.Port = o->ProxyPort;

		StrCpy(in.Username, sizeof(in.Username), o->ProxyUsername);
		StrCpy(in.Password, sizeof(in.Password), o->ProxyPassword);

		StrCpy(in.HttpCustomHeader, sizeof(in.HttpCustomHeader), o->CustomHttpHeader);
		StrCpy(in.HttpUserAgent, sizeof(in.HttpUserAgent), c->Cedar->HttpUserAgent);

#ifdef OS_WIN32
		in.Hwnd = c->hWndForUI;
#endif

		UniFormat(tmp, sizeof(tmp), _UU("STATUS_2"), in.TargetHostname, in.Hostname);
		PrintStatus(sess, tmp);

		switch (o->ProxyType)
		{
		case PROXY_HTTP:
			ret = ProxyHttpConnect(&out, &in, cancel_flag);
			break;
		case PROXY_SOCKS:
			ret = ProxySocks4Connect(&out, &in, cancel_flag);
			break;
		case PROXY_SOCKS5:
			ret = ProxySocks5Connect(&out, &in, cancel_flag);
			break;
		default:
			c->Err = ERR_INTERNAL_ERROR;
			Debug("ClientConnectGetSocket(): Unknown proxy type: %u!\n", o->ProxyType);
			return NULL;
		}

		c->Err = ProxyCodeToCedar(ret);

		if (c->Err != ERR_NO_ERROR)
		{
			Debug("ClientConnectGetSocket(): Connection via proxy server failed with error %u\n", ret);
			return NULL;
		}

		sock = out.Sock;

		CopyIP(&resolved_ip, &out.ResolvedIp);
	}

	if (additional_connect == false || IsZeroIP(&sock->RemoteIP))
	{
		if (IsZeroIP(&sock->RemoteIP) == false || (sock->IPv6 && GetIP6(&c->Session->ServerIP, hostname) == false) || (sock->IPv6 == false && GetIP4(&c->Session->ServerIP, hostname) == false))
		{
			Copy(&c->Session->ServerIP, &sock->RemoteIP, sizeof(c->Session->ServerIP));
		}
	}

	if (save_resolved_ip && IsZeroIP(&resolved_ip) == false)
	{
		Copy(&c->Session->ServerIP_CacheForNextConnect, &resolved_ip, sizeof(c->Session->ServerIP_CacheForNextConnect));
		Debug("ClientConnectGetSocket(): Saved %s IP address %r for future connections.\n", hostname, &resolved_ip);
	}

	return sock;
}

UINT ProxyCodeToCedar(UINT code)
{
	switch (code)
	{
	case PROXY_ERROR_SUCCESS:
		return ERR_NO_ERROR;
	case PROXY_ERROR_GENERIC:
	case PROXY_ERROR_VERSION:
		return ERR_PROXY_ERROR;
	case PROXY_ERROR_CANCELED:
		return ERR_USER_CANCEL;
	case PROXY_ERROR_CONNECTION:
		return ERR_PROXY_CONNECT_FAILED;
	case PROXY_ERROR_TARGET:
		return ERR_CONNECT_FAILED;
	case PROXY_ERROR_DISCONNECTED:
		return ERR_DISCONNECTED;
	case PROXY_ERROR_AUTHENTICATION:
		return ERR_PROXY_AUTH_FAILED;
	default:
		return ERR_INTERNAL_ERROR;
	}
}

// TCP connection function
SOCK *TcpConnectEx3(char *hostname, UINT port, UINT timeout, bool *cancel_flag, void *hWnd, bool no_nat_t, UINT *nat_t_error_code, bool try_start_ssl, IP *ret_ip)
{
	return TcpConnectEx4(hostname, port, timeout, cancel_flag, hWnd, no_nat_t, nat_t_error_code, try_start_ssl, NULL, NULL, NULL, ret_ip);
}
SOCK *TcpConnectEx4(char *hostname, UINT port, UINT timeout, bool *cancel_flag, void *hWnd, bool no_nat_t, UINT *nat_t_error_code, bool try_start_ssl, SSL_VERIFY_OPTION *ssl_option, UINT *ssl_err, char *hint_str, IP *ret_ip)
{
#ifdef	OS_WIN32
	if (hWnd == NULL)
	{
#endif	// OS_WIN32
		return ConnectEx5(hostname, port, timeout, cancel_flag, (no_nat_t ? NULL : VPN_RUDP_SVC_NAME), nat_t_error_code, try_start_ssl, true, ssl_option, ssl_err, hint_str, ret_ip);
#ifdef	OS_WIN32
	}
	else
	{
		return WinConnectEx4((HWND)hWnd, hostname, port, timeout, 0, NULL, NULL, nat_t_error_code, (no_nat_t ? NULL : VPN_RUDP_SVC_NAME), try_start_ssl, ssl_option, ssl_err, hint_str);
	}
#endif	// OS_WIN32
}

// Connect with TCP/IP
SOCK *TcpIpConnectEx(char *hostname, UINT port, bool *cancel_flag, void *hWnd, UINT *nat_t_error_code, bool no_nat_t, bool try_start_ssl, IP *ret_ip)
{
	return TcpIpConnectEx2(hostname, port, cancel_flag, hWnd, nat_t_error_code, no_nat_t, try_start_ssl, NULL, NULL, NULL, ret_ip);
}
SOCK *TcpIpConnectEx2(char *hostname, UINT port, bool *cancel_flag, void *hWnd, UINT *nat_t_error_code, bool no_nat_t, bool try_start_ssl, SSL_VERIFY_OPTION *ssl_option, UINT *ssl_err, char *hint_str, IP *ret_ip)
{
	SOCK *s = NULL;
	UINT dummy_int = 0;
	// Validate arguments
	if (nat_t_error_code == NULL)
	{
		nat_t_error_code = &dummy_int;
	}
	*nat_t_error_code = 0;
	if (hostname == NULL || port == 0)
	{
		return NULL;
	}

	s = TcpConnectEx4(hostname, port, 0, cancel_flag, hWnd, no_nat_t, nat_t_error_code, try_start_ssl, ssl_option, ssl_err, hint_str, ret_ip);
	if (s == NULL)
	{
		return NULL;
	}

	return s;
}

// Protocol routine initialization
void InitProtocol()
{
}

// Release the protocol routine
void FreeProtocol()
{
}

// Create a Hello packet
PACK *PackHello(void *random, UINT ver, UINT build, char *server_str)
{
	PACK *p;
	// Validate arguments
	if (random == NULL || server_str == NULL)
	{
		return NULL;
	}

	p = NewPack();
	PackAddStr(p, "hello", server_str);
	PackAddInt(p, "version", ver);
	PackAddInt(p, "build", build);
	PackAddData(p, "random", random, SHA1_SIZE);

	return p;
}

// Interpret the Hello packet
bool GetHello(PACK *p, void *random, UINT *ver, UINT *build, char *server_str, UINT server_str_size)
{
	// Validate arguments
	if (p == NULL || random == NULL || ver == NULL || server_str == NULL)
	{
		return false;
	}

	if (PackGetStr(p, "hello", server_str, server_str_size) == false)
	{
		return false;
	}
	*ver = PackGetInt(p, "version");
	*build = PackGetInt(p, "build");
	if (PackGetDataSize(p, "random") != SHA1_SIZE)
	{
		return false;
	}
	if (PackGetData(p, "random", random) == false)
	{
		return false;
	}

	return true;
}

// Get the authentication method from PACK
UINT GetAuthTypeFromPack(PACK *p)
{
	// Validate arguments
	if (p == NULL)
	{
		return 0;
	}

	return PackGetInt(p, "authtype");
}

// Get the HUB name and the user name from the PACK
bool GetHubnameAndUsernameFromPack(PACK *p, char *username, UINT username_size,
								   char *hubname, UINT hubname_size)
{
	// Validate arguments
	if (p == NULL || username == NULL || hubname == NULL)
	{
		return false;
	}

	if (PackGetStr(p, "username", username, username_size) == false)
	{
		return false;
	}
	if (PackGetStr(p, "hubname", hubname, hubname_size) == false)
	{
		return false;
	}
	return true;
}

// Get the protocol from PACK
UINT GetProtocolFromPack(PACK *p)
{
	// Validate arguments
	if (p == NULL)
	{
		return 0;
	}

#if	0
	return PackGetInt(p, "protocol");
#else
	// Limit to the TCP protocol in the current version
	return CONNECTION_TCP;
#endif
}

// Get the method from the PACK
bool GetMethodFromPack(PACK *p, char *method, UINT size)
{
	// Validate arguments
	if (p == NULL || method == NULL || size == 0)
	{
		return false;
	}

	return PackGetStr(p, "method", method, size);
}

// Generate a packet of certificate authentication login
PACK *PackLoginWithCert(char *hubname, char *username, X *x, void *sign, UINT sign_size)
{
	PACK *p;
	BUF *b;
	// Validate arguments
	if (hubname == NULL || username == NULL)
	{
		return NULL;
	}

	p = NewPack();
	PackAddStr(p, "method", "login");
	PackAddStr(p, "hubname", hubname);
	PackAddStr(p, "username", username);
	PackAddInt(p, "authtype", CLIENT_AUTHTYPE_CERT);

	// Certificate
	b = XToBuf(x, false);
	PackAddData(p, "cert", b->Buf, b->Size);
	FreeBuf(b);

	// Signature data
	PackAddData(p, "sign", sign, sign_size);

	return p;
}

// Generate a packet of plain text password authentication login
PACK *PackLoginWithPlainPassword(char *hubname, char *username, void *plain_password)
{
	PACK *p;
	// Validate arguments
	if (hubname == NULL || username == NULL)
	{
		return NULL;
	}

	p = NewPack();
	PackAddStr(p, "method", "login");
	PackAddStr(p, "hubname", hubname);
	PackAddStr(p, "username", username);
	PackAddInt(p, "authtype", CLIENT_AUTHTYPE_PLAIN_PASSWORD);
	PackAddStr(p, "plain_password", plain_password);

	return p;
}

// Generate a packet of WireGuard key login
PACK *PackLoginWithWireGuardKey(char *key)
{
	PACK *p;
	// Validate arguments
	if (key == NULL)
	{
		return NULL;
	}

	p = NewPack();
	PackAddStr(p, "method", "login");
	PackAddInt(p, "authtype", AUTHTYPE_WIREGUARD_KEY);
	PackAddStr(p, "key", key);

	return p;
}

// Generate a packet of OpenVPN certificate login
PACK *PackLoginWithOpenVPNCertificate(char *hubname, char *username, X *x)
{
	PACK *p;
	char cn_username[128];
	BUF *cert_buf = NULL;
	// Validate arguments
	if (hubname == NULL || username == NULL || x == NULL)
	{
		return NULL;
	}

	p = NewPack();
	PackAddStr(p, "method", "login");
	PackAddStr(p, "hubname", hubname);

	if (IsEmptyStr(username))
	{
		if (x->subject_name == NULL)
		{
			FreePack(p);
			return NULL;
		}
		UniToStr(cn_username, sizeof(cn_username), x->subject_name->CommonName);
		PackAddStr(p, "username", cn_username);
	}
	else
	{
		PackAddStr(p, "username", username);
	}

	PackAddInt(p, "authtype", AUTHTYPE_OPENVPN_CERT);

	cert_buf = XToBuf(x, false);
	PackAddBuf(p, "cert", cert_buf);
	FreeBuf(cert_buf);

	return p;
}

// Create a packet of password authentication login
PACK *PackLoginWithPassword(char *hubname, char *username, void *secure_password)
{
	PACK *p;
	// Validate arguments
	if (hubname == NULL || username == NULL)
	{
		return NULL;
	}

	p = NewPack();
	PackAddStr(p, "method", "login");
	PackAddStr(p, "hubname", hubname);
	PackAddStr(p, "username", username);
	PackAddInt(p, "authtype", CLIENT_AUTHTYPE_PASSWORD);
	PackAddData(p, "secure_password", secure_password, SHA1_SIZE);

	return p;
}

// Create a packet for anonymous login
PACK *PackLoginWithAnonymous(char *hubname, char *username)
{
	PACK *p;
	// Validate arguments
	if (hubname == NULL || username == NULL)
	{
		return NULL;
	}

	p = NewPack();
	PackAddStr(p, "method", "login");
	PackAddStr(p, "hubname", hubname);
	PackAddStr(p, "username", username);
	PackAddInt(p, "authtype", CLIENT_AUTHTYPE_ANONYMOUS);

	return p;
}

// Create a packet for the additional connection
PACK *PackAdditionalConnect(UCHAR *session_key)
{
	PACK *p;
	// Validate arguments
	if (session_key == NULL)
	{
		return NULL;
	}

	p = NewPack();
	PackAddStr(p, "method", "additional_connect");
	PackAddData(p, "session_key", session_key, SHA1_SIZE);

	return p;
}