Really connect to the same server in FTP network transaction.

net/base/nss_memio.c

 // Copyright (c) 2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 // Written in NSPR style to also be suitable for adding to the NSS demo suite
 
 /* memio is a simple NSPR I/O layer that lets you decouple NSS from
  * the real network.  It's rather like openssl's memory bio,
  * and is useful when your app absolutely, positively doesn't
  * want to let NSS do its own networking.
  */
@@ skipping 341 matching lines @@
     fd = PR_CreateIOLayerStub(memio_identity, &memio_layer_methods);
     secret = malloc(sizeof(struct PRFilePrivate));
     memset(secret, 0, sizeof(*secret));
 
     memio_buffer_new(&secret->readbuf, bufsize);
     memio_buffer_new(&secret->writebuf, bufsize);
     fd->secret = secret;
     return fd;
 }
 
-void memio_SetPeerName(PRFileDesc *fd, const PRNetAddr *peername)
+void memio_SetPeerName(PRFileDesc *fd, const struct sockaddr *peername,
+                       size_t peername_len)
 {
     PRFileDesc *memiofd = PR_GetIdentitiesLayer(fd, memio_identity);
     struct PRFilePrivate *secret =  memiofd->secret;
-    secret->peername = *peername;
+    size_t len;
+
+    memset(&secret->peername, 0, sizeof(secret->peername));
+    PR_ASSERT(peername_len <= sizeof(secret->peername));
+    len = PR_MIN(peername_len, sizeof(secret->peername));
+    memcpy(&secret->peername, peername, len);
 }
 
 memio_Private *memio_GetSecret(PRFileDesc *fd)
 {
     PRFileDesc *memiofd = PR_GetIdentitiesLayer(fd, memio_identity);
     struct PRFilePrivate *secret =  memiofd->secret;
     return (memio_Private *)secret;
 }
 
 int memio_GetReadParams(memio_Private *secret, char **buf)
@@ skipping 98 matching lines @@
     CHECKEQ(memio_buffer_unused_contiguous(&mb), 0);
     CHECKEQ(memio_buffer_used_contiguous(&mb), 1);
 
     /* TODO: add more cases */
 
     printf("Test passed\n");
     exit(0);
 }
 
 #endif