Richard Atterer fixed libcurl's way of dealing with the EPSV

response. Previously, libcurl would re-resolve the host name with the new
port number and attempt to connect to that, while it should use the IP from
the control channel. This bug made it hard to EPSV from an FTP server with
multiple IP addresses!

CHANGES

@@ -6,6 +6,13 @@
 
                                   Changelog
 
+Daniel (6 December 2004)
+- Richard Atterer fixed libcurl's way of dealing with the EPSV
+  response. Previously, libcurl would re-resolve the host name with the new
+  port number and attempt to connect to that, while it should use the IP from
+  the control channel. This bug made it hard to EPSV from an FTP server with
+  multiple IP addresses!
+
 Daniel (3 December 2004)
 - Bug report #1078066: when a chunked transfer was pre-maturely closed exactly
   at a chunk boundary it was not considered an error and thus went unnoticed.

RELEASE-NOTES

@@ -23,6 +23,7 @@ This release includes the following changes:
 
 This release includes the following bugfixes:
 
+ o EPSV on multi-homed servers now works correctly
  o chunked-encoded transfers could get closed pre-maturely without error
  o proxy CONNECT now default timeouts after 3600 seconds
  o --disable-epsv and --disable-eprt are ignored when connecting to an IPv6 ftp
@@ -57,6 +58,7 @@ advice from friends like these:
  Peter Wullinger, Guillaume Arluison, Alexander Krasnostavsky, Mohun Biswas,
  Tomas Pospisek, Gisle Vanem, Dan Fandrich, Paul Nolan, Andres Garcia,
  Tim Sneddon, Ian Gulliver, Jean-Philippe Barrette-LaPierre, Jeff Phillips,
- Wojciech Zwiefka, David Phillips, Reinout van Schouwen, Maurice Barnum
+ Wojciech Zwiefka, David Phillips, Reinout van Schouwen, Maurice Barnum,
+ Richard Atterer
 
         Thanks! (and sorry if I forgot to mention someone)

lib/ftp.c

@@ -1519,8 +1519,8 @@ CURLcode ftp_use_pasv(struct connectdata *conn,
 
   /* newhost must be able to hold a full IP-style address in ASCII, which
      in the IPv6 case means 5*8-1 = 39 letters */
-  char newhost[48];
-  char *newhostp=NULL;
+#define NEWHOST_BUFSIZE 48
+  char newhost[NEWHOST_BUFSIZE];
 
 #ifdef PF_INET6
   if(!conn->bits.ftp_use_epsv &&
@@ -1584,7 +1584,6 @@ CURLcode ftp_use_pasv(struct connectdata *conn,
 
     snprintf(newhost, sizeof(newhost),
              "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
-    newhostp = newhost;
     newport = (port[0]<<8) + port[1];
   }
   else if (229 == results[modeoff]) {
@@ -1613,8 +1612,8 @@ CURLcode ftp_use_pasv(struct connectdata *conn,
         if(ptr) {
           newport = num;
 
-          /* we should use the same host we already are connected to */
-          newhostp = conn->host.name;
+          /* We must use the same IP we are already connected to */
+          Curl_printable_address(conn->ip_addr, newhost, NEWHOST_BUFSIZE);
         }
       }
       else
@@ -1646,12 +1645,12 @@ CURLcode ftp_use_pasv(struct connectdata *conn,
   }
   else {
     /* normal, direct, ftp connection */
-    rc = Curl_resolv(conn, newhostp, newport, &addr);
+    rc = Curl_resolv(conn, newhost, newport, &addr);
     if(rc == CURLRESOLV_PENDING)
       rc = Curl_wait_for_resolv(conn, &addr);
 
     if(!addr) {
-      failf(data, "Can't resolve new host %s:%d", newhostp, newport);
+      failf(data, "Can't resolve new host %s:%d", newhost, newport);
       return CURLE_FTP_CANT_GET_HOST;
     }
     connectport = newport; /* we connect to the remote port */
@@ -1676,13 +1675,13 @@ CURLcode ftp_use_pasv(struct connectdata *conn,
 
   if(data->set.verbose)
     /* this just dumps information about this second connection */
-    ftp_pasv_verbose(conn, conninfo, newhostp, connectport);
+    ftp_pasv_verbose(conn, conninfo, newhost, connectport);
 
 #ifndef CURL_DISABLE_HTTP
   if(conn->bits.tunnel_proxy) {
     /* We want "seamless" FTP operations through HTTP proxy tunnel */
     result = Curl_ConnectHTTPProxyTunnel(conn, SECONDARYSOCKET,
-                                         newhostp, newport);
+                                         newhost, newport);
     if(CURLE_OK != result)
       return result;
   }