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SOCKS5 support by default

Add -socks=<n> to select SOCKS version to use. 4 and 5 are supported,
5 is default.
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sipa committed Apr 1, 2012
1 parent 1210aa4 commit 60a87bce873ce1f76a80b7b8546e83a0cd4e07a5
Showing with 169 additions and 29 deletions.
  1. +2 −1 src/init.cpp
  2. +167 −28 src/netbase.cpp
@@ -178,7 +178,8 @@ bool AppInit2(int argc, char* argv[])
" -dbcache=<n> \t\t " + _("Set database cache size in megabytes (default: 25)") + "\n" +
" -dblogsize=<n> \t\t " + _("Set database disk log size in megabytes (default: 100)") + "\n" +
" -timeout=<n> \t " + _("Specify connection timeout (in milliseconds)") + "\n" +
" -proxy=<ip:port> \t " + _("Connect through socks4 proxy") + "\n" +
" -proxy=<ip:port> \t " + _("Connect through socks proxy") + "\n" +
" -socks=<n> \t " + _("Select the version of socks proxy to use (4 or 5, 5 is default)") + "\n" +
" -dns \t " + _("Allow DNS lookups for addnode and connect") + "\n" +
" -port=<port> \t\t " + _("Listen for connections on <port> (default: 8333 or testnet: 18333)") + "\n" +
" -maxconnections=<n>\t " + _("Maintain at most <n> connections to peers (default: 125)") + "\n" +
@@ -156,6 +156,161 @@ bool LookupNumeric(const char *pszName, CService& addr, int portDefault)
return Lookup(pszName, addr, portDefault, false);
}

bool static Socks4(const CService &addrDest, SOCKET& hSocket)
{
printf("SOCKS4 connecting %s\n", addrDest.ToString().c_str());
if (!addrDest.IsIPv4())
{
closesocket(hSocket);
return error("Proxy destination is not IPv4");
}
char pszSocks4IP[] = "\4\1\0\0\0\0\0\0user";
struct sockaddr_in addr;
addrDest.GetSockAddr(&addr);
memcpy(pszSocks4IP + 2, &addr.sin_port, 2);
memcpy(pszSocks4IP + 4, &addr.sin_addr, 4);
char* pszSocks4 = pszSocks4IP;
int nSize = sizeof(pszSocks4IP);

int ret = send(hSocket, pszSocks4, nSize, MSG_NOSIGNAL);
if (ret != nSize)
{
closesocket(hSocket);
return error("Error sending to proxy");
}
char pchRet[8];
if (recv(hSocket, pchRet, 8, 0) != 8)
{
closesocket(hSocket);
return error("Error reading proxy response");
}
if (pchRet[1] != 0x5a)
{
closesocket(hSocket);
if (pchRet[1] != 0x5b)
printf("ERROR: Proxy returned error %d\n", pchRet[1]);
return false;
}
printf("SOCKS4 connected %s\n", addrDest.ToString().c_str());
return true;
}

bool static Socks5(const CService &addrDest, SOCKET& hSocket)
{
printf("SOCKS5 connecting %s\n", addrDest.ToString().c_str());
char pszSocks5Init[] = "\5\1\0";
char *pszSocks5 = pszSocks5Init;
int nSize = sizeof(pszSocks5Init);

int ret = send(hSocket, pszSocks5, nSize, MSG_NOSIGNAL);
if (ret != nSize)
{
closesocket(hSocket);
return error("Error sending to proxy");
}
char pchRet1[2];
if (recv(hSocket, pchRet1, 2, 0) != 2)
{
closesocket(hSocket);
return error("Error reading proxy response");
}
if (pchRet1[0] != 0x05 || pchRet1[1] != 0x00)
{
closesocket(hSocket);
return error("Proxy failed to initialize");
}
char pszSocks5IPv4[] = "\5\1\0\1\0\0\0\0\0\0";
char pszSocks5IPv6[] = "\5\1\0\4\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
if (addrDest.IsIPv4())
{
struct sockaddr_in addr;
addrDest.GetSockAddr(&addr);
memcpy(pszSocks5IPv4 + 4, &addr.sin_addr, 4);
memcpy(pszSocks5IPv4 + 8, &addr.sin_port, 2);
pszSocks5 = pszSocks5IPv4;
nSize = sizeof(pszSocks5IPv4);
}
else
{
#ifdef USE_IPV6
struct sockaddr_in6 addr;
addrDest.GetSockAddr6(&addr);
memcpy(pszSocks5IPv6 + 4, &addr.sin6_addr, 16);
memcpy(pszSocks5IPv6 + 20, &addr.sin6_port, 2);
pszSocks5 = pszSocks5IPv6;
nSize = sizeof(pszSocks5IPv6);
#else
return error("IPv6 support is not compiled in");
#endif
}
ret = send(hSocket, pszSocks5, nSize, MSG_NOSIGNAL);
if (ret != nSize)
{
closesocket(hSocket);
return error("Error sending to proxy");
}
char pchRet2[4];
if (recv(hSocket, pchRet2, 4, 0) != 4)
{
closesocket(hSocket);
return error("Error reading proxy response");
}
if (pchRet2[0] != 0x05)
{
closesocket(hSocket);
return error("Proxy failed to accept request");
}
if (pchRet2[1] != 0x00)
{
closesocket(hSocket);
switch (pchRet2[1])
{
case 0x01: return error("Proxy error: general failure");
case 0x02: return error("Proxy error: connection not allowed");
case 0x03: return error("Proxy error: network unreachable");
case 0x04: return error("Proxy error: host unreachable");
case 0x05: return error("Proxy error: connection refused");
case 0x06: return error("Proxy error: TTL expired");
case 0x07: return error("Proxy error: protocol error");
case 0x08: return error("Proxy error: address type not supported");
default: return error("Proxy error: unknown");
}
}
if (pchRet2[2] != 0x00)
{
closesocket(hSocket);
return error("Error: malformed proxy response");
}
char pchRet3[256];
switch (pchRet2[3])
{
case 0x01: ret = recv(hSocket, pchRet3, 4, 0) != 4; break;
case 0x04: ret = recv(hSocket, pchRet3, 16, 0) != 16; break;
case 0x03:
{
ret = recv(hSocket, pchRet3, 1, 0) != 1;
if (ret)
return error("Error reading from proxy");
int nRecv = pchRet3[0];
ret = recv(hSocket, pchRet3, nRecv, 0) != nRecv;
break;
}
default: closesocket(hSocket); return error("Error: malformed proxy response");
}
if (ret)
{
closesocket(hSocket);
return error("Error reading from proxy");
}
if (recv(hSocket, pchRet3, 2, 0) != 2)
{
closesocket(hSocket);
return error("Error reading from proxy");
}
printf("SOCKS5 connected %s\n", addrDest.ToString().c_str());
return true;
}

bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout)
{
hSocketRet = INVALID_SOCKET;
@@ -260,35 +415,19 @@ bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout)

if (fProxy)
{
printf("proxy connecting %s\n", addrDest.ToString().c_str());
char pszSocks4IP[] = "\4\1\0\0\0\0\0\0user";
struct sockaddr_in addr;
addrDest.GetSockAddr(&addr);
memcpy(pszSocks4IP + 2, &addr.sin_port, 2);
memcpy(pszSocks4IP + 4, &addr.sin_addr, 4);
char* pszSocks4 = pszSocks4IP;
int nSize = sizeof(pszSocks4IP);

int ret = send(hSocket, pszSocks4, nSize, MSG_NOSIGNAL);
if (ret != nSize)
{
closesocket(hSocket);
return error("Error sending to proxy");
}
char pchRet[8];
if (recv(hSocket, pchRet, 8, 0) != 8)
{
closesocket(hSocket);
return error("Error reading proxy response");
}
if (pchRet[1] != 0x5a)
switch(GetArg("-socks", 5))
{
closesocket(hSocket);
if (pchRet[1] != 0x5b)
printf("ERROR: Proxy returned error %d\n", pchRet[1]);
return false;
}
printf("proxy connected %s\n", addrDest.ToString().c_str());
case 4:
if (!Socks4(addrDest, hSocket))
return false;
break;

case 5:
default:
if (!Socks5(addrDest, hSocket))
return false;
break;
}
}

hSocketRet = hSocket;

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