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Protocol.c: adapt ClientConnectGetSocket() for new proxy functions

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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 2019-10-29 04:50:32 +01:00
parent 3c21d982fc
commit 63caa4b07f
1 changed files with 116 additions and 131 deletions
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237
src/Cedar/Protocol.c
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@ -5996,104 +5996,89 @@ SOCK *ClientConnectToServer(CONNECTION *c)
// Return a socket by connecting to the server // Return a socket by connecting to the server
SOCK *ClientConnectGetSocket(CONNECTION *c, bool additional_connect) SOCK *ClientConnectGetSocket(CONNECTION *c, bool additional_connect)
{ {
SOCK *s = NULL;
CLIENT_OPTION *o;
WPC_CONNECT w;
wchar_t tmp[MAX_SIZE];
SESSION *sess;
volatile bool *cancel_flag = NULL; volatile bool *cancel_flag = NULL;
void *hWnd; char hostname[MAX_HOST_NAME_LEN];
UINT nat_t_err = 0; bool save_resolved_ip = false;
bool is_additional_rudp_session = false; CLIENT_OPTION *o;
UCHAR uc = 0; SESSION *sess;
IP ret_ip; SOCK *sock = NULL;
IP resolved_ip;
// Validate arguments // Validate arguments
if (c == NULL) if (c == NULL || c->Session == NULL || c->Session->ClientOption == NULL)
{ {
return NULL; return NULL;
} }
Zero(&ret_ip, sizeof(IP)); cancel_flag = &c->Halt;
Zero(&w, sizeof(w));
sess = c->Session; sess = c->Session;
if (sess != NULL)
{
cancel_flag = &sess->CancelConnect;
is_additional_rudp_session = sess->IsRUDPSession;
}
hWnd = c->hWndForUI;
o = c->Session->ClientOption; o = c->Session->ClientOption;
if (additional_connect) Zero(&resolved_ip, sizeof(resolved_ip));
{
if (sess != NULL)
{
Copy(&ret_ip, &sess->ServerIP_CacheForNextConnect, sizeof(IP));
}
}
if (c->RestoreServerNameAndPort && additional_connect) if (additional_connect == false && c->RestoreServerNameAndPort)
{ {
// Restore to the original server name and port number // Update server name and port number.
// At the time of writing this comment RestoreServerNameAndPort is never true.
c->RestoreServerNameAndPort = false; c->RestoreServerNameAndPort = false;
if (StrCmpi(c->ServerName, o->Hostname) != 0) if (StrCmpi(c->ServerName, o->Hostname) != 0)
{ {
StrCpy(c->ServerName, sizeof(c->ServerName), o->Hostname); StrCpy(c->ServerName, sizeof(c->ServerName), o->Hostname);
Zero(&ret_ip, sizeof(IP));
} }
c->ServerPort = o->Port; c->ServerPort = o->Port;
} }
StrCpy(w.HostName, sizeof(w.HostName), c->ServerName); if (IsZeroIP(&sess->ServerIP_CacheForNextConnect) == false)
w.Port = c->ServerPort;
StrCpy(w.ProxyHostName, sizeof(w.ProxyHostName), o->ProxyName);
w.ProxyPort = o->ProxyPort;
StrCpy(w.ProxyUsername, sizeof(w.ProxyUsername), o->ProxyUsername);
StrCpy(w.ProxyPassword, sizeof(w.ProxyPassword), o->ProxyPassword);
StrCpy(w.CustomHttpHeader, sizeof(w.CustomHttpHeader), o->CustomHttpHeader);
switch (o->ProxyType)
{ {
case PROXY_DIRECT: // TCP/IP IPToStr(hostname, sizeof(hostname), &sess->ServerIP_CacheForNextConnect);
UniFormat(tmp, sizeof(tmp), _UU("STATUS_4"), w.HostName); 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 nat_t_err = 0;
wchar_t tmp[MAX_SIZE];
UniFormat(tmp, sizeof(tmp), _UU("STATUS_4"), hostname);
PrintStatus(sess, tmp); PrintStatus(sess, tmp);
// Production job
if (o->PortUDP == 0) if (o->PortUDP == 0)
{
{ {
// If additional_connect == false, enable trying to NAT-T connection // If additional_connect == false, enable trying to NAT-T connection
// If additional_connect == true, follow the IsRUDPSession setting in this session // If additional_connect == true, follow the IsRUDPSession setting in this session
s = TcpIpConnectEx(w.HostName, w.Port, sock = TcpIpConnectEx(hostname, c->ServerPort,
(bool *)cancel_flag, hWnd, &nat_t_err, (additional_connect ? (!is_additional_rudp_session) : false), (bool *)cancel_flag, c->hWndForUI, &nat_t_err, (additional_connect ? (!sess->IsRUDPSession) : false),
true, &ret_ip); true, &resolved_ip);
}
} }
else else
{ {
// Mode to connect with R-UDP directly without using NAT-T server when using UDP // Mode to connect with R-UDP directly without using NAT-T server when using UDP
IP ip; IP ip;
if (StrToIP(&ip, hostname))
Zero(&ip, sizeof(ip)); {
sock = NewRUDPClientDirect(VPN_RUDP_SVC_NAME, &ip, o->PortUDP, &nat_t_err,
StrToIP(&ip, o->Hostname);
s = NewRUDPClientDirect(VPN_RUDP_SVC_NAME, &ip, o->PortUDP, &nat_t_err,
TIMEOUT_TCP_PORT_CHECK, (bool *)cancel_flag, NULL, NULL, 0, false); TIMEOUT_TCP_PORT_CHECK, (bool *)cancel_flag, NULL, NULL, 0, false);
if (s != NULL) if (sock != NULL)
{ {
StrCpy(s->UnderlayProtocol, sizeof(s->UnderlayProtocol), SOCK_UNDERLAY_NAT_T); StrCpy(sock->UnderlayProtocol, sizeof(sock->UnderlayProtocol), SOCK_UNDERLAY_NAT_T);
} }
} }
if (s == NULL) }
if (sock == NULL)
{ {
// Connection failure // Connection failure
if (nat_t_err != RUDP_ERROR_NAT_T_TWO_OR_MORE) if (nat_t_err != RUDP_ERROR_NAT_T_TWO_OR_MORE)
@ -6104,85 +6089,85 @@ SOCK *ClientConnectGetSocket(CONNECTION *c, bool additional_connect)
{ {
c->Err = ERR_NAT_T_TWO_OR_MORE; c->Err = ERR_NAT_T_TWO_OR_MORE;
} }
return NULL; return NULL;
} }
break;
case PROXY_HTTP: // HTTP Proxy
UniFormat(tmp, sizeof(tmp), _UU("STATUS_2"), w.HostName, w.ProxyHostName);
PrintStatus(sess, tmp);
// Proxy connection
s = ProxyConnectEx3(c, &w, additional_connect, (bool *)cancel_flag, hWnd, 0);
if (s == NULL)
{
// Connection failure
return NULL;
}
break;
case PROXY_SOCKS: // SOCKS4 Proxy
UniFormat(tmp, sizeof(tmp), _UU("STATUS_2"), w.HostName, w.ProxyHostName);
PrintStatus(sess, tmp);
// SOCKS4 connection
s = SocksConnectEx2(c, w.ProxyHostName, w.ProxyPort,
w.HostName, w.Port, w.ProxyUsername, additional_connect, (bool *)cancel_flag,
hWnd, 0, &ret_ip);
if (s == NULL)
{
// Connection failure
return NULL;
}
break;
case PROXY_SOCKS5: // SOCKS5 Proxy
UniFormat(tmp, sizeof(tmp), _UU("STATUS_2"), w.HostName, w.ProxyHostName);
PrintStatus(sess, tmp);
// SOCKS5 connection
s = Socks5Connect(c, &w, additional_connect, (bool *)cancel_flag, hWnd, 0, &ret_ip);
if (s == NULL)
{
// Connection failure
return NULL;
}
break;
}
if (s == NULL)
{
// Connection failure
c->Err = ERR_CONNECT_FAILED;
} }
else else
{ {
// Success to connect wchar_t tmp[MAX_SIZE];
// Keep a note of the IP address PROXY_PARAM_OUT out;
if (additional_connect == false || IsZeroIP(&s->RemoteIP)) 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)
{ {
char *hostname = o->ProxyType == PROXY_DIRECT ? w.HostName : w.ProxyHostName; case PROXY_HTTP:
if (((s->IsRUDPSocket || s->IPv6) && IsZeroIP(&s->RemoteIP) == false && o->ProxyType == PROXY_DIRECT) || GetIP(&c->Session->ServerIP, hostname) == false) 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)
{ {
Copy(&c->Session->ServerIP, &s->RemoteIP, sizeof(IP)); 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 (((sock->IsRUDPSocket || sock->IPv6) && IsZeroIP(&sock->RemoteIP) == false && o->ProxyType == PROXY_DIRECT) || GetIP(&c->Session->ServerIP, hostname) == false)
{
Copy(&c->Session->ServerIP, &sock->RemoteIP, sizeof(c->Session->ServerIP));
} }
} }
if (IsZeroIP(&ret_ip) == false) if (save_resolved_ip && IsZeroIP(&resolved_ip) == false)
{ {
if (c->Session != NULL) 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);
if (additional_connect == false)
{
Copy(&c->Session->ServerIP_CacheForNextConnect, &ret_ip, sizeof(IP));
Debug("Saved ServerIP_CacheForNextConnect: %s = %r\n", c->ServerName, &ret_ip);
}
}
}
} }
return s; return sock;
} }
UINT ProxyCodeToCedar(UINT code) UINT ProxyCodeToCedar(UINT code)