Make a channel getter method to retrieve transport names.

src/or/channel.c

@@ -2379,9 +2379,14 @@ channel_do_open_actions(channel_t *chan)
     /* only report it to the geoip module if it's not a known router */
     if (!router_get_by_id_digest(chan->identity_digest)) {
       if (channel_get_addr_if_possible(chan, &remote_addr)) {
-        /* XXXX 5040/4773 : Is this 'NULL' right? */
-        geoip_note_client_seen(GEOIP_CLIENT_CONNECT, &remote_addr, NULL,
+        char *transport_name = NULL;
+        if (chan->get_transport_name(chan, &transport_name) < 0)
+          transport_name = NULL;
+
+        geoip_note_client_seen(GEOIP_CLIENT_CONNECT,
+                               &remote_addr, transport_name,
                                now);
+        tor_free(transport_name);
       }
       /* Otherwise the underlying transport can't tell us this, so skip it */
     }

src/or/channel.h

@@ -84,6 +84,8 @@ struct channel_s {
    * available.
    */
   int (*get_remote_addr)(channel_t *, tor_addr_t *);
+  int (*get_transport_name)(channel_t *chan, char **transport_out);
+
 #define GRD_FLAG_ORIGINAL 1
 #define GRD_FLAG_ADDR_ONLY 2
   /*

src/or/channeltls.c

@@ -55,6 +55,8 @@ static void channel_tls_close_method(channel_t *chan);
 static const char * channel_tls_describe_transport_method(channel_t *chan);
 static int
 channel_tls_get_remote_addr_method(channel_t *chan, tor_addr_t *addr_out);
+static int
+channel_tls_get_transport_name_method(channel_t *chan, char **transport_out);
 static const char *
 channel_tls_get_remote_descr_method(channel_t *chan, int flags);
 static int channel_tls_has_queued_writes_method(channel_t *chan);
@@ -114,6 +116,7 @@ channel_tls_common_init(channel_tls_t *tlschan)
   chan->describe_transport = channel_tls_describe_transport_method;
   chan->get_remote_addr = channel_tls_get_remote_addr_method;
   chan->get_remote_descr = channel_tls_get_remote_descr_method;
+  chan->get_transport_name = channel_tls_get_transport_name_method;
   chan->has_queued_writes = channel_tls_has_queued_writes_method;
   chan->is_canonical = channel_tls_is_canonical_method;
   chan->matches_extend_info = channel_tls_matches_extend_info_method;
@@ -405,6 +408,30 @@ channel_tls_get_remote_addr_method(channel_t *chan, tor_addr_t *addr_out)
   return 1;
 }
 
+/**
+ * Get the name of the pluggable transport used by a channel_tls_t.
+ *
+ * This implements the get_transport_name for channel_tls_t. If the
+ * channel uses a pluggable transport, copy its name to
+ * <b>transport_out</b> and return 0. If the channel did not use a
+ * pluggable transport, return -1. */
+
+static int
+channel_tls_get_transport_name_method(channel_t *chan, char **transport_out)
+{
+  channel_tls_t *tlschan = BASE_CHAN_TO_TLS(chan);
+
+  tor_assert(tlschan);
+  tor_assert(transport_out);
+  tor_assert(tlschan->conn);
+
+  if (!tlschan->conn->ext_or_transport)
+    return -1;
+
+  *transport_out = tor_strdup(tlschan->conn->ext_or_transport);
+  return 0;
+}
+
 /**
  * Get endpoint description of a channel_tls_t
  *