Allow MapAddress and Automap to work together

The trick here is to apply mapaddress first, and only then apply
automapping.  Otherwise, the automap checks don't get done.

Fix for bug 7555; bugfix on all versions of Tor supporting both
MapAddress and AutoMap.

changes/bug7555

@@ -0,0 +1,5 @@
+  o Major bugfixes (client):
+    - Allow MapAddress and AutomapHostsOnResolve to work together when an
+      address is mapped into another address type that must be
+      automapped at resolve time.  Fixes bug 7555; bugfix on
+      0.2.0.1-alpha.

src/or/addressmap.c

@@ -390,13 +390,35 @@ addressmap_rewrite(char *address, size_t maxlen,
       goto done;
     }
 
-    if (ent && ent->source == ADDRMAPSRC_DNS) {
-      sa_family_t f;
-      tor_addr_t tmp;
-      f = tor_addr_parse(&tmp, ent->new_address);
-      if (f == AF_INET && !(flags & AMR_FLAG_USE_IPV4_DNS))
-        goto done;
-      else if (f == AF_INET6 && !(flags & AMR_FLAG_USE_IPV6_DNS))
+    switch (ent->source) {
+      case ADDRMAPSRC_DNS:
+        {
+          sa_family_t f;
+          tor_addr_t tmp;
+          f = tor_addr_parse(&tmp, ent->new_address);
+          if (f == AF_INET && !(flags & AMR_FLAG_USE_IPV4_DNS))
+            goto done;
+          else if (f == AF_INET6 && !(flags & AMR_FLAG_USE_IPV6_DNS))
+            goto done;
+        }
+        break;
+      case ADDRMAPSRC_CONTROLLER:
+      case ADDRMAPSRC_TORRC:
+        if (!(flags & AMR_FLAG_USE_MAPADDRESS))
+          goto done;
+        break;
+      case ADDRMAPSRC_AUTOMAP:
+        if (!(flags & AMR_FLAG_USE_AUTOMAP))
+          goto done;
+        break;
+      case ADDRMAPSRC_TRACKEXIT:
+        if (!(flags & AMR_FLAG_USE_TRACKEXIT))
+          goto done;
+        break;
+      case ADDRMAPSRC_NONE:
+      default:
+        log_warn(LD_BUG, "Unknown addrmap source value %d. Ignoring it.",
+                 (int) ent->source);
         goto done;
     }
 

src/or/addressmap.h

@@ -16,8 +16,11 @@ void addressmap_clean(time_t now);
 void addressmap_clear_configured(void);
 void addressmap_clear_transient(void);
 void addressmap_free_all(void);
-#define AMR_FLAG_USE_IPV4_DNS (1u<<0)
-#define AMR_FLAG_USE_IPV6_DNS (1u<<1)
+#define AMR_FLAG_USE_IPV4_DNS   (1u<<0)
+#define AMR_FLAG_USE_IPV6_DNS   (1u<<1)
+#define AMR_FLAG_USE_MAPADDRESS (1u<<2)
+#define AMR_FLAG_USE_AUTOMAP    (1u<<3)
+#define AMR_FLAG_USE_TRACKEXIT  (1u<<4)
 int addressmap_rewrite(char *address, size_t maxlen, unsigned flags,
                        time_t *expires_out,
                        addressmap_entry_source_t *exit_source_out);

src/or/connection_edge.c

@@ -946,6 +946,15 @@ connection_ap_handshake_rewrite(entry_connection_t *conn,
   if (! conn->original_dest_address)
     conn->original_dest_address = tor_strdup(conn->socks_request->address);
 
+  if (socks->command != SOCKS_COMMAND_RESOLVE_PTR) {
+    const unsigned rewrite_flags = AMR_FLAG_USE_MAPADDRESS;
+    if (addressmap_rewrite(socks->address, sizeof(socks->address),
+                       rewrite_flags, &out->map_expires, &out->exit_source)) {
+      control_event_stream_status(conn, STREAM_EVENT_REMAP,
+                                  REMAP_STREAM_SOURCE_CACHE);
+    }
+  }
+
   if (socks->command == SOCKS_COMMAND_RESOLVE &&
       tor_addr_parse(&addr_tmp, socks->address)<0 &&
       options->AutomapHostsOnResolve) {
@@ -1014,16 +1023,20 @@ connection_ap_handshake_rewrite(entry_connection_t *conn,
     }
   } else if (!out->automap) {
     /* For address map controls, remap the address. */
-    unsigned rewrite_flags = 0;
+    unsigned rewrite_flags = AMR_FLAG_USE_AUTOMAP | AMR_FLAG_USE_TRACKEXIT;
+    addressmap_entry_source_t exit_source2;
     if (conn->use_cached_ipv4_answers)
       rewrite_flags |= AMR_FLAG_USE_IPV4_DNS;
     if (conn->use_cached_ipv6_answers)
       rewrite_flags |= AMR_FLAG_USE_IPV6_DNS;
     if (addressmap_rewrite(socks->address, sizeof(socks->address),
-                           rewrite_flags, &out->map_expires, &out->exit_source)) {
+                        rewrite_flags, &out->map_expires, &exit_source2)) {
       control_event_stream_status(conn, STREAM_EVENT_REMAP,
                                   REMAP_STREAM_SOURCE_CACHE);
     }
+    if (out->exit_source == ADDRMAPSRC_NONE) {
+      out->exit_source = exit_source2;
+    }
   }
 
   if (!out->automap && address_is_in_virtual_range(socks->address)) {

src/test/test_config.c

@@ -51,8 +51,7 @@ test_config_addressmap(void *arg)
 
 /* Use old interface for now, so we don't need to rewrite the unit tests */
 #define addressmap_rewrite(a,s,eo,ao)                                   \
-  addressmap_rewrite((a),(s),AMR_FLAG_USE_IPV4_DNS|AMR_FLAG_USE_IPV6_DNS, \
-                     (eo),(ao))
+  addressmap_rewrite((a),(s), ~0, (eo),(ao))
 
   /* MapAddress .invalidwildcard.com .torserver.exit  - no match */
   strlcpy(address, "www.invalidwildcard.com", sizeof(address));

src/test/test_entryconn.c

@@ -643,7 +643,6 @@ test_entryconn_rewrite_mapaddress_automap_onion(void *arg)
   connection_free_(ENTRY_TO_CONN(ec4));
 }
 
-#if 0
 /* This fails because of #7555 */
 /* This time is the same, but we start with a mapping from a non-onion
  * address. */
@@ -654,6 +653,7 @@ test_entryconn_rewrite_mapaddress_automap_onion2(void *arg)
   entry_connection_t *ec2 = NULL;
   entry_connection_t *ec3 = NULL;
   rewrite_result_t rr;
+  char *msg = NULL;
 
   ec2 = entry_connection_new(CONN_TYPE_AP, AF_INET);
   ec3 = entry_connection_new(CONN_TYPE_AP, AF_INET);
@@ -662,6 +662,7 @@ test_entryconn_rewrite_mapaddress_automap_onion2(void *arg)
   get_options_mutable()->AllowDotExit = 1;
   smartlist_add(get_options_mutable()->AutomapHostsSuffixes,
                 tor_strdup(".onion"));
+  parse_virtual_addr_network("192.168.0.0/16", AF_INET, 0, &msg);
   config_line_append(&get_options_mutable()->AddressMap,
                      "MapAddress", "irc.example.com abcdefghijklmnop.onion");
   config_register_addressmaps(get_options());
@@ -708,7 +709,6 @@ test_entryconn_rewrite_mapaddress_automap_onion2(void *arg)
   connection_free_(ENTRY_TO_CONN(ec2));
   connection_free_(ENTRY_TO_CONN(ec3));
 }
-#endif
 
 #define REWRITE(name)                           \
   { #name, test_entryconn_##name, TT_FORK, &test_rewrite_setup, NULL }
@@ -727,10 +727,8 @@ struct testcase_t entryconn_tests[] = {
   REWRITE(rewrite_automap_exit),
   REWRITE(rewrite_mapaddress_exit),
   REWRITE(rewrite_mapaddress_automap_onion),
-  /*
-    This fails because of #7555
   REWRITE(rewrite_mapaddress_automap_onion2),
-  */
+
   END_OF_TESTCASES
 };