mirror of
https://github.com/SoftEtherVPN/SoftEtherVPN.git
synced 2024-12-27 10:39:53 +03:00
Protocol.c: adapt ClientConnectGetSocket() for new proxy functions
The function has been greatly improved, here are some of the changes: - The required SESSION (c->Session) parameter is checked correctly: the function returns immediately in case it's NULL. Previously, the function didn't return in case the parameter was NULL; multiple checks were in place, but not in all instances where the parameter was dereferenced. - The resolved IP address is cached with all proxy types. - The "RestoreServerNameAndPort" variable is documented. - The Debug() messages have been improved.
This commit is contained in:
Davide Beatrici
parent
3c21d982fc
commit
63caa4b07f
@ -5996,104 +5996,89 @@ SOCK *ClientConnectToServer(CONNECTION *c)
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// Return a socket by connecting to the server
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SOCK *ClientConnectGetSocket(CONNECTION *c, bool additional_connect)
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{
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SOCK *s = NULL;
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CLIENT_OPTION *o;
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WPC_CONNECT w;
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wchar_t tmp[MAX_SIZE];
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SESSION *sess;
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volatile bool *cancel_flag = NULL;
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void *hWnd;
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UINT nat_t_err = 0;
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bool is_additional_rudp_session = false;
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UCHAR uc = 0;
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IP ret_ip;
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char hostname[MAX_HOST_NAME_LEN];
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bool save_resolved_ip = false;
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CLIENT_OPTION *o;
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SESSION *sess;
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SOCK *sock = NULL;
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IP resolved_ip;
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// Validate arguments
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if (c == NULL)
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if (c == NULL || c->Session == NULL || c->Session->ClientOption == NULL)
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{
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return NULL;
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}
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Zero(&ret_ip, sizeof(IP));
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Zero(&w, sizeof(w));
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cancel_flag = &c->Halt;
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sess = c->Session;
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if (sess != NULL)
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{
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cancel_flag = &sess->CancelConnect;
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is_additional_rudp_session = sess->IsRUDPSession;
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}
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hWnd = c->hWndForUI;
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o = c->Session->ClientOption;
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if (additional_connect)
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{
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if (sess != NULL)
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{
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Copy(&ret_ip, &sess->ServerIP_CacheForNextConnect, sizeof(IP));
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}
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}
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Zero(&resolved_ip, sizeof(resolved_ip));
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if (c->RestoreServerNameAndPort && additional_connect)
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if (additional_connect == false && c->RestoreServerNameAndPort)
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{
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// Restore to the original server name and port number
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// Update server name and port number.
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// At the time of writing this comment RestoreServerNameAndPort is never true.
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c->RestoreServerNameAndPort = false;
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if (StrCmpi(c->ServerName, o->Hostname) != 0)
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{
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StrCpy(c->ServerName, sizeof(c->ServerName), o->Hostname);
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Zero(&ret_ip, sizeof(IP));
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}
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c->ServerPort = o->Port;
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}
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StrCpy(w.HostName, sizeof(w.HostName), c->ServerName);
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w.Port = c->ServerPort;
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StrCpy(w.ProxyHostName, sizeof(w.ProxyHostName), o->ProxyName);
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w.ProxyPort = o->ProxyPort;
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StrCpy(w.ProxyUsername, sizeof(w.ProxyUsername), o->ProxyUsername);
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StrCpy(w.ProxyPassword, sizeof(w.ProxyPassword), o->ProxyPassword);
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StrCpy(w.CustomHttpHeader, sizeof(w.CustomHttpHeader), o->CustomHttpHeader);
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switch (o->ProxyType)
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if (IsZeroIP(&sess->ServerIP_CacheForNextConnect) == false)
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{
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case PROXY_DIRECT: // TCP/IP
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UniFormat(tmp, sizeof(tmp), _UU("STATUS_4"), w.HostName);
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IPToStr(hostname, sizeof(hostname), &sess->ServerIP_CacheForNextConnect);
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Debug("ClientConnectGetSocket(): Using cached IP address %s\n", hostname);
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}
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else
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{
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IP tmp;
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StrCpy(hostname, sizeof(hostname), o->ProxyType == PROXY_DIRECT ? c->ServerName : o->ProxyName);
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if (StrToIP(&tmp, hostname) == false)
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{
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// The hostname is not an IP address
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save_resolved_ip = true;
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}
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}
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if (o->ProxyType == PROXY_DIRECT)
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{
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UINT nat_t_err = 0;
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wchar_t tmp[MAX_SIZE];
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UniFormat(tmp, sizeof(tmp), _UU("STATUS_4"), hostname);
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PrintStatus(sess, tmp);
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// Production job
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if (o->PortUDP == 0)
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{
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{
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// If additional_connect == false, enable trying to NAT-T connection
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// If additional_connect == true, follow the IsRUDPSession setting in this session
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s = TcpIpConnectEx(w.HostName, w.Port,
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(bool *)cancel_flag, hWnd, &nat_t_err, (additional_connect ? (!is_additional_rudp_session) : false),
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true, &ret_ip);
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}
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// If additional_connect == false, enable trying to NAT-T connection
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// If additional_connect == true, follow the IsRUDPSession setting in this session
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sock = TcpIpConnectEx(hostname, c->ServerPort,
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(bool *)cancel_flag, c->hWndForUI, &nat_t_err, (additional_connect ? (!sess->IsRUDPSession) : false),
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true, &resolved_ip);
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}
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else
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{
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// Mode to connect with R-UDP directly without using NAT-T server when using UDP
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IP ip;
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Zero(&ip, sizeof(ip));
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StrToIP(&ip, o->Hostname);
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s = NewRUDPClientDirect(VPN_RUDP_SVC_NAME, &ip, o->PortUDP, &nat_t_err,
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TIMEOUT_TCP_PORT_CHECK, (bool *)cancel_flag, NULL, NULL, 0, false);
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if (s != NULL)
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if (StrToIP(&ip, hostname))
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{
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StrCpy(s->UnderlayProtocol, sizeof(s->UnderlayProtocol), SOCK_UNDERLAY_NAT_T);
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sock = NewRUDPClientDirect(VPN_RUDP_SVC_NAME, &ip, o->PortUDP, &nat_t_err,
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TIMEOUT_TCP_PORT_CHECK, (bool *)cancel_flag, NULL, NULL, 0, false);
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if (sock != NULL)
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{
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StrCpy(sock->UnderlayProtocol, sizeof(sock->UnderlayProtocol), SOCK_UNDERLAY_NAT_T);
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}
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}
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}
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if (s == NULL)
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if (sock == NULL)
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{
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// Connection failure
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if (nat_t_err != RUDP_ERROR_NAT_T_TWO_OR_MORE)
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@ -6104,85 +6089,85 @@ SOCK *ClientConnectGetSocket(CONNECTION *c, bool additional_connect)
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{
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c->Err = ERR_NAT_T_TWO_OR_MORE;
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}
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return NULL;
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}
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break;
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case PROXY_HTTP: // HTTP Proxy
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UniFormat(tmp, sizeof(tmp), _UU("STATUS_2"), w.HostName, w.ProxyHostName);
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PrintStatus(sess, tmp);
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// Proxy connection
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s = ProxyConnectEx3(c, &w, additional_connect, (bool *)cancel_flag, hWnd, 0);
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if (s == NULL)
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{
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// Connection failure
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return NULL;
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}
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break;
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case PROXY_SOCKS: // SOCKS4 Proxy
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UniFormat(tmp, sizeof(tmp), _UU("STATUS_2"), w.HostName, w.ProxyHostName);
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PrintStatus(sess, tmp);
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// SOCKS4 connection
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s = SocksConnectEx2(c, w.ProxyHostName, w.ProxyPort,
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w.HostName, w.Port, w.ProxyUsername, additional_connect, (bool *)cancel_flag,
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hWnd, 0, &ret_ip);
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if (s == NULL)
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{
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// Connection failure
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return NULL;
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}
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break;
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case PROXY_SOCKS5: // SOCKS5 Proxy
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UniFormat(tmp, sizeof(tmp), _UU("STATUS_2"), w.HostName, w.ProxyHostName);
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PrintStatus(sess, tmp);
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// SOCKS5 connection
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s = Socks5Connect(c, &w, additional_connect, (bool *)cancel_flag, hWnd, 0, &ret_ip);
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if (s == NULL)
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{
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// Connection failure
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return NULL;
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}
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break;
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}
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if (s == NULL)
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{
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// Connection failure
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c->Err = ERR_CONNECT_FAILED;
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}
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else
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{
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// Success to connect
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// Keep a note of the IP address
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if (additional_connect == false || IsZeroIP(&s->RemoteIP))
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wchar_t tmp[MAX_SIZE];
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PROXY_PARAM_OUT out;
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PROXY_PARAM_IN in;
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UINT ret;
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Zero(&in, sizeof(in));
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in.Timeout = 0;
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StrCpy(in.TargetHostname, sizeof(in.TargetHostname), c->ServerName);
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in.TargetPort = c->ServerPort;
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StrCpy(in.Hostname, sizeof(in.Hostname), IsEmptyStr(hostname) ? o->ProxyName : hostname);
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in.Port = o->ProxyPort;
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StrCpy(in.Username, sizeof(in.Username), o->ProxyUsername);
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StrCpy(in.Password, sizeof(in.Password), o->ProxyPassword);
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StrCpy(in.HttpCustomHeader, sizeof(in.HttpCustomHeader), o->CustomHttpHeader);
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StrCpy(in.HttpUserAgent, sizeof(in.HttpUserAgent), c->Cedar->HttpUserAgent);
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#ifdef OS_WIN32
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in.Hwnd = c->hWndForUI;
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#endif
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UniFormat(tmp, sizeof(tmp), _UU("STATUS_2"), in.TargetHostname, in.Hostname);
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PrintStatus(sess, tmp);
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switch (o->ProxyType)
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{
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char *hostname = o->ProxyType == PROXY_DIRECT ? w.HostName : w.ProxyHostName;
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if (((s->IsRUDPSocket || s->IPv6) && IsZeroIP(&s->RemoteIP) == false && o->ProxyType == PROXY_DIRECT) || GetIP(&c->Session->ServerIP, hostname) == false)
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{
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Copy(&c->Session->ServerIP, &s->RemoteIP, sizeof(IP));
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}
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case PROXY_HTTP:
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ret = ProxyHttpConnect(&out, &in, cancel_flag);
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break;
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case PROXY_SOCKS:
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ret = ProxySocks4Connect(&out, &in, cancel_flag);
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break;
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case PROXY_SOCKS5:
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ret = ProxySocks5Connect(&out, &in, cancel_flag);
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break;
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default:
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c->Err = ERR_INTERNAL_ERROR;
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Debug("ClientConnectGetSocket(): Unknown proxy type: %u!\n", o->ProxyType);
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return NULL;
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}
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if (IsZeroIP(&ret_ip) == false)
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{
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if (c->Session != NULL)
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{
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if (additional_connect == false)
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{
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Copy(&c->Session->ServerIP_CacheForNextConnect, &ret_ip, sizeof(IP));
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c->Err = ProxyCodeToCedar(ret);
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Debug("Saved ServerIP_CacheForNextConnect: %s = %r\n", c->ServerName, &ret_ip);
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}
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}
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if (c->Err != ERR_NO_ERROR)
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{
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Debug("ClientConnectGetSocket(): Connection via proxy server failed with error %u\n", ret);
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return NULL;
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}
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sock = out.Sock;
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CopyIP(&resolved_ip, &out.ResolvedIp);
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}
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if (additional_connect == false || IsZeroIP(&sock->RemoteIP))
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{
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if (((sock->IsRUDPSocket || sock->IPv6) && IsZeroIP(&sock->RemoteIP) == false && o->ProxyType == PROXY_DIRECT) || GetIP(&c->Session->ServerIP, hostname) == false)
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{
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Copy(&c->Session->ServerIP, &sock->RemoteIP, sizeof(c->Session->ServerIP));
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}
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}
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return s;
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if (save_resolved_ip && IsZeroIP(&resolved_ip) == false)
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{
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Copy(&c->Session->ServerIP_CacheForNextConnect, &resolved_ip, sizeof(c->Session->ServerIP_CacheForNextConnect));
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Debug("ClientConnectGetSocket(): Saved %s IP address %r for future connections.\n", hostname, &resolved_ip);
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}
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return sock;
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}
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UINT ProxyCodeToCedar(UINT code)
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