Merge #8033: Fix Socks5() connect failures to be less noisy and less unnecessarily scary

bf9266e Use Socks5ErrorString() to decode error responses from socks proxy. (Warren Togami)
94fd1d8 Make Socks5() InterruptibleRecv() timeout/failures informative. (Warren Togami)
0d9af79 SOCKS5 connecting and connected messages with -debug=net. (Warren Togami)
00678bd Make failures to connect via Socks5() more informative and less unnecessarily scary. (Warren Togami)

Author: laanwj

src/netbase.cpp

@@ -291,10 +291,25 @@ struct ProxyCredentials
     std::string password;
 };
 
+std::string Socks5ErrorString(int err)
+{
+    switch(err) {
+        case 0x01: return "general failure";
+        case 0x02: return "connection not allowed";
+        case 0x03: return "network unreachable";
+        case 0x04: return "host unreachable";
+        case 0x05: return "connection refused";
+        case 0x06: return "TTL expired";
+        case 0x07: return "protocol error";
+        case 0x08: return "address type not supported";
+        default:   return "unknown";
+    }
+}
+
 /** Connect using SOCKS5 (as described in RFC1928) */
 static bool Socks5(const std::string& strDest, int port, const ProxyCredentials *auth, SOCKET& hSocket)
 {
-    LogPrintf("SOCKS5 connecting %s\n", strDest);
+    LogPrint("net", "SOCKS5 connecting %s\n", strDest);
     if (strDest.size() > 255) {
         CloseSocket(hSocket);
         return error("Hostname too long");
@@ -318,7 +333,8 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials
     char pchRet1[2];
     if (!InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
         CloseSocket(hSocket);
-        return error("Error reading proxy response");
+        LogPrintf("Socks5() connect to %s:%d failed: InterruptibleRecv() timeout or other failure\n", strDest, port);
+        return false;
     }
     if (pchRet1[0] != 0x05) {
         CloseSocket(hSocket);
@@ -379,19 +395,10 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials
         return error("Proxy failed to accept request");
     }
     if (pchRet2[1] != 0x00) {
+        // Failures to connect to a peer that are not proxy errors
         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");
-        }
+        LogPrintf("Socks5() connect to %s:%d failed: %s\n", strDest, port, Socks5ErrorString(pchRet2[1]));
+        return false;
     }
     if (pchRet2[2] != 0x00) {
         CloseSocket(hSocket);
@@ -423,7 +430,7 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials
         CloseSocket(hSocket);
         return error("Error reading from proxy");
     }
-    LogPrintf("SOCKS5 connected %s\n", strDest);
+    LogPrint("net", "SOCKS5 connected %s\n", strDest);
     return true;
 }