Merge branch 'mr_274_squashed' into maint-0.4.5

changes/ticket40254

@@ -0,0 +1,4 @@
+  o Minor bugfixes (relay, configuration):
+    - Don't attempt to discover address (IPv4 or IPv6) if no ORPort for it can
+      be found in the configuration. Fixes bug 40254; bugfix on 0.4.5.1-alpha.
+

src/feature/relay/relay_find_addr.c

@@ -99,6 +99,13 @@ relay_address_new_suggestion(const tor_addr_t *suggested_addr,
  *       populated by the NETINFO cell content or HTTP header from a
  *       directory.
  *
+ * The AddressDisableIPv6 is checked here for IPv6 address discovery and if
+ * set, false is returned and addr_out is UNSPEC.
+ *
+ * Before doing any discovery, the configuration is checked for an ORPort of
+ * the given family. If none can be found, false is returned and addr_out is
+ * UNSPEC.
+ *
  * Return true on success and addr_out contains the address to use for the
  * given family. On failure to find the address, false is returned and
  * addr_out is set to an AF_UNSPEC address. */
@@ -118,6 +125,12 @@ relay_find_addr_to_publish, (const or_options_t *options, int family,
     return false;
   }
 
+  /* There is no point on attempting an address discovery to publish if we
+   * don't have an ORPort for this family. */
+  if (!routerconf_find_or_port(options, family)) {
+    return false;
+  }
+
   /* First, check our resolved address cache. It should contain the address
    * we've discovered from the periodic relay event. */
   resolved_addr_get_last(family, addr_out);
@@ -131,6 +144,17 @@ relay_find_addr_to_publish, (const or_options_t *options, int family,
     if (find_my_address(options, family, LOG_INFO, addr_out, NULL, NULL)) {
       goto found;
     }
+    /* No publishable address was found even though we have an ORPort thus
+     * print a notice log so operator can notice. We'll do that every hour so
+     * it is not too spammy but enough so operators address the issue. */
+    static ratelim_t rlim = RATELIM_INIT(3600);
+    log_fn_ratelim(&rlim, LOG_NOTICE, LD_CONFIG,
+                   "Unable to find %s address for ORPort %u. "
+                   "You might want to specify %sOnly to it or set an "
+                   "explicit address or set Address.",
+                   fmt_af_family(family),
+                   routerconf_find_or_port(options, family),
+                   fmt_af_family(family));
   }
 
   /* Third, consider address from our suggestion cache. */

src/feature/relay/router.c

@@ -2047,12 +2047,11 @@ MOCK_IMPL(STATIC int,
 router_build_fresh_unsigned_routerinfo,(routerinfo_t **ri_out))
 {
   routerinfo_t *ri = NULL;
-  tor_addr_t ipv4_addr, ipv6_addr;
+  tor_addr_t ipv4_addr;
   char platform[256];
   int hibernating = we_are_hibernating();
   const or_options_t *options = get_options();
   int result = TOR_ROUTERINFO_ERROR_INTERNAL_BUG;
-  uint16_t ipv6_orport = 0;
 
   if (BUG(!ri_out)) {
     result = TOR_ROUTERINFO_ERROR_INTERNAL_BUG;
@@ -2064,10 +2063,6 @@ router_build_fresh_unsigned_routerinfo,(routerinfo_t **ri_out))
   bool have_v4 = relay_find_addr_to_publish(options, AF_INET,
                                             RELAY_FIND_ADDR_NO_FLAG,
                                             &ipv4_addr);
-  bool have_v6 = relay_find_addr_to_publish(options, AF_INET6,
-                                            RELAY_FIND_ADDR_NO_FLAG,
-                                            &ipv6_addr);
-
   /* Tor requires a relay to have an IPv4 so bail if we can't find it. */
   if (!have_v4) {
     log_info(LD_CONFIG, "Don't know my address while generating descriptor. "
@@ -2079,24 +2074,21 @@ router_build_fresh_unsigned_routerinfo,(routerinfo_t **ri_out))
   /* Log a message if the address in the descriptor doesn't match the ORPort
    * and DirPort addresses configured by the operator. */
   router_check_descriptor_address_consistency(&ipv4_addr);
-  router_check_descriptor_address_consistency(&ipv6_addr);
 
   ri = tor_malloc_zero(sizeof(routerinfo_t));
+  tor_addr_copy(&ri->ipv4_addr, &ipv4_addr);
   ri->cache_info.routerlist_index = -1;
   ri->nickname = tor_strdup(options->Nickname);
 
   /* IPv4. */
-  tor_addr_copy(&ri->ipv4_addr, &ipv4_addr);
   ri->ipv4_orport = routerconf_find_or_port(options, AF_INET);
   ri->ipv4_dirport = routerconf_find_dir_port(options, 0);
 
-  /* IPv6. Do not publish an IPv6 if we don't have an ORPort that can be used
-   * with the address. This is possible for instance if the ORPort is
-   * IPv4Only. */
-  ipv6_orport = routerconf_find_or_port(options, AF_INET6);
-  if (have_v6 && ipv6_orport != 0) {
-    tor_addr_copy(&ri->ipv6_addr, &ipv6_addr);
-    ri->ipv6_orport = ipv6_orport;
+  /* Optionally check for an IPv6. We still publish without one. */
+  if (relay_find_addr_to_publish(options, AF_INET6, RELAY_FIND_ADDR_NO_FLAG,
+                                 &ri->ipv6_addr)) {
+    ri->ipv6_orport = routerconf_find_or_port(options, AF_INET6);
+    router_check_descriptor_address_consistency(&ri->ipv6_addr);
   }
 
   ri->supports_tunnelled_dir_requests =
@@ -2679,18 +2671,11 @@ check_descriptor_ipaddress_changed(time_t now)
       previous = &my_ri->ipv6_addr;
     }
 
-    /* Ignore returned value because we want to notice not only an address
-     * change but also if an address is lost (current == UNSPEC). */
-    bool found = find_my_address(get_options(), family, LOG_INFO, &current,
-                                 &method, &hostname);
-    if (!found) {
-      /* Address was possibly not found because it is simply not configured or
-       * discoverable. Fallback to our cache, which includes any suggestion
-       * sent by a trusted directory server. */
-      found = relay_find_addr_to_publish(get_options(), family,
-                                         RELAY_FIND_ADDR_CACHE_ONLY,
-                                         &current);
-    }
+    /* Attempt to discovery the publishable address for the family which will
+     * actively attempt to discover the address if we are configured with a
+     * port for the family. */
+    relay_find_addr_to_publish(get_options(), family, RELAY_FIND_ADDR_NO_FLAG,
+                               &current);
 
     /* The "current" address might be UNSPEC meaning it was not discovered nor
      * found in our current cache. If we had an address before and we have

src/test/test_relay.c

@@ -11,6 +11,7 @@
 #include "feature/stats/bwhist.h"
 #include "core/or/relay.h"
 #include "lib/container/order.h"
+#include "lib/encoding/confline.h"
 /* For init/free stuff */
 #include "core/or/scheduler.h"
 
@@ -23,6 +24,8 @@
 #include "feature/relay/routermode.h"
 #include "feature/dirclient/dir_server_st.h"
 
+#define CONFIG_PRIVATE
+#include "app/config/config.h"
 #include "app/config/resolve_addr.h"
 
 /* Test suite stuff */
@@ -298,11 +301,12 @@ test_find_addr_to_publish(void *arg)
   int family;
   bool ret;
   tor_addr_t ipv4_addr, ipv6_addr, cache_addr;
-  or_options_t options;
+  or_options_t *options;
 
   (void) arg;
 
-  memset(&options, 0, sizeof(options));
+  options = options_new();
+  options_init(options);
 
   /* Populate our resolved cache with a valid IPv4 and IPv6. */
   family = tor_addr_parse(&ipv4_addr, "1.2.3.4");
@@ -317,13 +321,24 @@ test_find_addr_to_publish(void *arg)
   resolved_addr_get_last(AF_INET6, &cache_addr);
   tt_assert(tor_addr_eq(&ipv6_addr, &cache_addr));
 
+  /* Setup ORPort config. */
+  {
+    int n, w, r;
+    char *msg = NULL;
+
+    config_line_append(&options->ORPort_lines, "ORPort", "9001");
+
+    r = parse_ports(options, 0, &msg, &n, &w);
+    tt_int_op(r, OP_EQ, 0);
+  }
+
   /* 1. Address located in the resolved cache. */
-  ret = relay_find_addr_to_publish(&options, AF_INET,
+  ret = relay_find_addr_to_publish(options, AF_INET,
                                    RELAY_FIND_ADDR_CACHE_ONLY, &cache_addr);
   tt_assert(ret);
   tt_assert(tor_addr_eq(&ipv4_addr, &cache_addr));
 
-  ret = relay_find_addr_to_publish(&options, AF_INET6,
+  ret = relay_find_addr_to_publish(options, AF_INET6,
                                    RELAY_FIND_ADDR_CACHE_ONLY, &cache_addr);
   tt_assert(ret);
   tt_assert(tor_addr_eq(&ipv6_addr, &cache_addr));
@@ -334,13 +349,13 @@ test_find_addr_to_publish(void *arg)
    *    the find_my_address() code path because that is extensively tested in
    *    another unit tests. */
   resolved_addr_set_suggested(&ipv4_addr);
-  ret = relay_find_addr_to_publish(&options, AF_INET,
+  ret = relay_find_addr_to_publish(options, AF_INET,
                                    RELAY_FIND_ADDR_CACHE_ONLY, &cache_addr);
   tt_assert(ret);
   tt_assert(tor_addr_eq(&ipv4_addr, &cache_addr));
 
   resolved_addr_set_suggested(&ipv6_addr);
-  ret = relay_find_addr_to_publish(&options, AF_INET6,
+  ret = relay_find_addr_to_publish(options, AF_INET6,
                                    RELAY_FIND_ADDR_CACHE_ONLY, &cache_addr);
   tt_assert(ret);
   tt_assert(tor_addr_eq(&ipv6_addr, &cache_addr));
@@ -348,15 +363,15 @@ test_find_addr_to_publish(void *arg)
   resolve_addr_reset_suggested(AF_INET6);
 
   /* 3. No IP anywhere. */
-  ret = relay_find_addr_to_publish(&options, AF_INET,
+  ret = relay_find_addr_to_publish(options, AF_INET,
                                    RELAY_FIND_ADDR_CACHE_ONLY, &cache_addr);
   tt_assert(!ret);
-  ret = relay_find_addr_to_publish(&options, AF_INET6,
+  ret = relay_find_addr_to_publish(options, AF_INET6,
                                    RELAY_FIND_ADDR_CACHE_ONLY, &cache_addr);
   tt_assert(!ret);
 
  done:
-  ;
+  or_options_free(options);
 }
 
 struct testcase_t relay_tests[] = {