Changeset 58631 in vbox for trunk/src/VBox/Devices/Network

Timestamp:

Nov 10, 2015 12:10:28 PM (9 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

104023

Message:

NAT: tcp_fconnect - when DNS proxy is enabled and the target is
port 53 of CTL_DNS, connect to the first resolver in the list in a
kind of reverse port-forwarding. This makes fallback to TCP work with
DNS proxy when reply doesn't fit into UDP 512 bytes payload.

Currently when we have more than one resolver we only forward to the
first one and don't try others.

File:

• trunk/src/VBox/Devices/Network/slirp/tcp_subr.c (modified) (1 diff)

trunk/src/VBox/Devices/Network/slirp/tcp_subr.c

@@ -426 +426 @@
             {
                 case CTL_DNS:
+                    /*
+                     * TCP DNS proxy.  We only support "forwarding" to
+                     * single server.  We don't have infrastructure in
+                     * place to re-try connections to other servers.
+                     */
+                    if (   pData->fUseDnsProxy
+                        && so->so_fport == RT_H2N_U16_C(53))
+                    {
+                        struct dns_entry *ns = TAILQ_LAST(&pData->pDnsList, dns_list_head);
+                        if (ns != NULL)
+                        {
+                            addr.sin_addr = ns->de_addr;
+                            break;
+                        }
+                    }
+                    /* FALLTHROUGH */
                 case CTL_ALIAS:
                 default: