- Constantine Sapuntzakis fixed bug report #2784055

(http://curl.haxx.se/bug/view.cgi?id=2784055) identifying a problem to
  connect to SOCKS proxies when using the multi interface. It turned out to
  almost not work at all previously. We need to wait for the TCP connect to
  be properly verified before doing the SOCKS magic.

  There's still a flaw in the FTP code for this.

CHANGES

@@ -6,6 +6,15 @@
 
                                   Changelog
 
+Daniel Stenberg (8 May 2009)
+- Constantine Sapuntzakis fixed bug report #2784055
+  (http://curl.haxx.se/bug/view.cgi?id=2784055) identifying a problem to
+  connect to SOCKS proxies when using the multi interface. It turned out to
+  almost not work at all previously. We need to wait for the TCP connect to
+  be properly verified before doing the SOCKS magic.
+
+  There's still a flaw in the FTP code for this.
+
 Daniel Stenberg (7 May 2009)
 - Made the SO_SNDBUF setting for the data connection socket for ftp uploads as
   well. See change 28 Apr 2009.

RELEASE-NOTES

@@ -42,6 +42,7 @@ This release includes the following bugfixes:
  o Rejected SSL session ids are killed properly (for OpenSSL and GnuTLS builds)
  o Deal with the TFTP OACK packet
  o fixed roff mistakes in man pages
+ o use SOCKS proxy with the multi interface
 
 This release includes the following known bugs:
 

lib/multi.c

@@ -1055,9 +1055,16 @@ static CURLMcode multi_runsingle(struct Curl_multi *multi,
       easy->result = Curl_is_connected(easy->easy_conn,
                                        FIRSTSOCKET,
                                        &connected);
-      if(connected)
-        easy->result = Curl_protocol_connect(easy->easy_conn,
-                                             &protocol_connect);
+      if(connected) {
+        /* see if we need to do any proxy magic first once we connected */
+        easy->result = Curl_connected_proxy(easy->easy_conn);
+
+        if(!easy->result)
+          /* if everything is still fine we do the protocol-specific connect
+             setup */
+          easy->result = Curl_protocol_connect(easy->easy_conn,
+                                               &protocol_connect);
+      }
 
       if(CURLE_OK != easy->result) {
         /* failure detected */

lib/url.c

@@ -2814,6 +2814,47 @@ ConnectionStore(struct SessionHandle *data,
   return i;
 }
 
+/* after a TCP connection to the proxy has been verified, this function does
+   the next magic step.
+
+   Note: this function (and its sub-functions) calls failf()
+
+*/
+CURLcode Curl_connected_proxy(struct connectdata *conn)
+{
+  CURLcode result = CURLE_OK;
+  struct SessionHandle *data = conn->data;
+
+  switch(data->set.proxytype) {
+#ifndef CURL_DISABLE_PROXY
+  case CURLPROXY_SOCKS5:
+  case CURLPROXY_SOCKS5_HOSTNAME:
+    result = Curl_SOCKS5(conn->proxyuser, conn->proxypasswd,
+                         conn->host.name, conn->remote_port,
+                         FIRSTSOCKET, conn);
+    break;
+  case CURLPROXY_SOCKS4:
+    result = Curl_SOCKS4(conn->proxyuser, conn->host.name,
+                         conn->remote_port, FIRSTSOCKET, conn, FALSE);
+    break;
+  case CURLPROXY_SOCKS4A:
+    result = Curl_SOCKS4(conn->proxyuser, conn->host.name,
+                         conn->remote_port, FIRSTSOCKET, conn, TRUE);
+    break;
+#endif /* CURL_DISABLE_PROXY */
+  case CURLPROXY_HTTP:
+  case CURLPROXY_HTTP_1_0:
+    /* do nothing here. handled later. */
+    break;
+  default:
+    failf(data, "unknown proxytype option given");
+      result = CURLE_COULDNT_CONNECT;
+      break;
+  } /* switch proxytype */
+
+  return result;
+}
+
 static CURLcode ConnectPlease(struct SessionHandle *data,
                               struct connectdata *conn,
                               struct Curl_dns_entry *hostaddr,
@@ -2838,39 +2879,14 @@ static CURLcode ConnectPlease(struct SessionHandle *data,
                            &addr,
                            connected);
   if(CURLE_OK == result) {
-    /* All is cool, then we store the current information */
+    /* All is cool, we store the current information */
     conn->dns_entry = hostaddr;
     conn->ip_addr = addr;
 
-    switch(data->set.proxytype) {
-#ifndef CURL_DISABLE_PROXY
-    case CURLPROXY_SOCKS5:
-    case CURLPROXY_SOCKS5_HOSTNAME:
-      result = Curl_SOCKS5(conn->proxyuser, conn->proxypasswd,
-                           conn->host.name, conn->remote_port,
-                           FIRSTSOCKET, conn);
-      break;
-    case CURLPROXY_SOCKS4:
-      result = Curl_SOCKS4(conn->proxyuser, conn->host.name,
-                           conn->remote_port, FIRSTSOCKET, conn, FALSE);
-      break;
-    case CURLPROXY_SOCKS4A:
-      result = Curl_SOCKS4(conn->proxyuser, conn->host.name,
-                           conn->remote_port, FIRSTSOCKET, conn, TRUE);
-      break;
-#endif /* CURL_DISABLE_PROXY */
-    case CURLPROXY_HTTP:
-    case CURLPROXY_HTTP_1_0:
-      /* do nothing here. handled later. */
-      break;
-    default:
-      failf(data, "unknown proxytype option given");
-      result = CURLE_COULDNT_CONNECT;
-      break;
-    } /* switch proxytype */
-  } /* if result is ok */
-
-  if(result)
+    if(*connected)
+      result = Curl_connected_proxy(conn);
+  }
+  else
     *connected = FALSE; /* mark it as not connected */
 
   return result;
@@ -4761,8 +4777,6 @@ CURLcode Curl_done(struct connectdata **connp,
 
   Curl_expire(data, 0); /* stop timer */
 
-  Curl_getoff_all_pipelines(data, conn);
-
   if(conn->bits.done ||
      (conn->send_pipe->size + conn->recv_pipe->size != 0 &&
       !data->set.reuse_forbid &&
@@ -4773,6 +4787,8 @@ CURLcode Curl_done(struct connectdata **connp,
 
   conn->bits.done = TRUE; /* called just now! */
 
+  Curl_getoff_all_pipelines(data, conn);
+
   /* Cleanup possible redirect junk */
   if(data->req.newurl) {
     free(data->req.newurl);

lib/url.h

@@ -85,4 +85,6 @@ void Curl_reset_reqproto(struct connectdata *conn);
 #define CURL_DEFAULT_PROXY_PORT 1080 /* default proxy port unless specified */
 #define CURL_DEFAULT_SOCKS5_GSSAPI_SERVICE "rcmd" /* default socks5 gssapi service */
 
+CURLcode Curl_connected_proxy(struct connectdata *conn);
+
 #endif