Set IPv6 preferences for bridges even if there is no ri.

Tor now sets IPv6 preferences on rewrite_node_address_for_bridge() even if
there is only ri or rs. It always warns about them.

Also Tor now sets the IPv6 address in rs as well as it sets the one in ri.

Fixes #24572 on 9e9edf7 in 0.2.4.5-alpha.
Fixes #24573 on c213f27 in 0.2.8.2-alpha.

Signed-off-by: Fernando Fernandez Mancera <ffernandezmancera@gmail.com>

1 files changed, 50 insertions, 9 deletions

diff --git a/src/or/bridges.c b/src/or/bridges.c
index 0b1bbbd158..204ff26842 100644
--- a/src/or/bridges.c
+++ b/src/or/bridges.c
@@ -716,7 +716,6 @@ rewrite_node_address_for_bridge(const bridge_info_t *bridge, node_t *node)
   if (node->ri) {
     routerinfo_t *ri = node->ri;
     tor_addr_from_ipv4h(&addr, ri->addr);
-
     if ((!tor_addr_compare(&bridge->addr, &addr, CMP_EXACT) &&
          bridge->port == ri->or_port) ||
         (!tor_addr_compare(&bridge->addr, &ri->ipv6_addr, CMP_EXACT) &&
@@ -774,16 +773,58 @@ rewrite_node_address_for_bridge(const bridge_info_t *bridge, node_t *node)
     routerstatus_t *rs = node->rs;
     tor_addr_from_ipv4h(&addr, rs->addr);
 
-    if (!tor_addr_compare(&bridge->addr, &addr, CMP_EXACT) &&
-        bridge->port == rs->or_port) {
+    if ((!tor_addr_compare(&bridge->addr, &addr, CMP_EXACT) &&
+        bridge->port == rs->or_port) ||
+       (!tor_addr_compare(&bridge->addr, &rs->ipv6_addr, CMP_EXACT) &&
+        bridge->port == rs->ipv6_orport)) {
       /* they match, so no need to do anything */
     } else {
-      rs->addr = tor_addr_to_ipv4h(&bridge->addr);
-      rs->or_port = bridge->port;
-      log_info(LD_DIR,
-               "Adjusted bridge routerstatus for '%s' to match "
-               "configured address %s.",
-               rs->nickname, fmt_addrport(&bridge->addr, rs->or_port));
+      if (tor_addr_family(&bridge->addr) == AF_INET) {
+        rs->addr = tor_addr_to_ipv4h(&bridge->addr);
+        rs->or_port = bridge->port;
+        log_info(LD_DIR,
+                 "Adjusted bridge routerstatus for '%s' to match "
+                 "configured address %s.",
+                 rs->nickname, fmt_addrport(&bridge->addr, rs->or_port));
+      /* set IPv6 preferences even if there is no ri */
+      } else if (tor_addr_family(&bridge->addr) == AF_INET6) {
+        tor_addr_copy(&rs->ipv6_addr, &bridge->addr);
+        rs->ipv6_orport = bridge->port;
+        log_info(LD_DIR,
+                 "Adjusted bridge routerstatus for '%s' to match configured"
+                 " address %s.",
+                 rs->nickname, fmt_addrport(&rs->ipv6_addr, rs->ipv6_orport));
+      } else {
+        log_err(LD_BUG, "Address family not supported: %d.",
+                tor_addr_family(&bridge->addr));
+        return;
+      }
+    }
+
+    if (options->ClientPreferIPv6ORPort == -1) {
+      /* Mark which address to use based on which bridge_t we got. */
+      node->ipv6_preferred = (tor_addr_family(&bridge->addr) == AF_INET6 &&
+                              !tor_addr_is_null(&node->rs->ipv6_addr));
+    } else {
+      /* Mark which address to use based on user preference */
+      node->ipv6_preferred = (fascist_firewall_prefer_ipv6_orport(options) &&
+                              !tor_addr_is_null(&node->rs->ipv6_addr));
+    }
+
+    /* XXXipv6 we lack support for falling back to another address for
+    the same relay, warn the user */
+    if (!tor_addr_is_null(&rs->ipv6_addr)) {
+      tor_addr_port_t ap;
+      node_get_pref_orport(node, &ap);
+      log_notice(LD_CONFIG,
+                 "Bridge '%s' has both an IPv4 and an IPv6 address.  "
+                 "Will prefer using its %s address (%s) based on %s.",
+                 rs->nickname,
+                 node->ipv6_preferred ? "IPv6" : "IPv4",
+                 fmt_addrport(&ap.addr, ap.port),
+                 options->ClientPreferIPv6ORPort == -1 ?
+                 "the configured Bridge address" :
+                 "ClientPreferIPv6ORPort");
     }
   }
 }