Implement a few more node-based functions

Some of these functions only work for routerinfo-based nodes, and as
such are only usable for advisory purposes.  Fortunately, our uses
of them are compatible with this limitation.

src/common/util.c

@@ -934,7 +934,7 @@ esc_for_log(const char *s)
   char *result, *outp;
   size_t len = 3;
   if (!s) {
-    return tor_strdup("");
+    return tor_strdup("(null)");
   }
 
   for (cp = s; *cp; ++cp) {

src/or/command.c

@@ -273,10 +273,13 @@ command_process_create_cell(cell_t *cell, or_connection_t *conn)
            "Received CREATE cell (circID %d) for known circ. "
            "Dropping (age %d).",
            cell->circ_id, (int)(time(NULL) - conn->_base.timestamp_created));
-    if (node)
+    if (node) {
+      char *p = esc_for_log(node_get_platform(node));
       log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
              "Details: nickname \"%s\", platform %s.",
-             node_get_nickname(node), escaped(node_get_platform(node)));
+             node_get_nickname(node), p);
+      tor_free(p);
+    }
     return;
   }
 

src/or/nodelist.c

@@ -656,9 +656,10 @@ node_get_address_string(const node_t *node, char *buf, size_t len)
 long
 node_get_declared_uptime(const node_t *node)
 {
-  (void)node;
-  UNIMPLEMENTED_NODELIST();
-  return 0;
+  if (node->ri)
+    return node->ri->uptime;
+  else
+    return -1;
 }
 
 /** Return <b>node</b>'s declared or_port */
@@ -673,22 +674,27 @@ node_get_orport(const node_t *node)
     return 0;
 }
 
-/** Return <b>node</b>'s platform string */
+/** Return <b>node</b>'s platform string, or NULL if we don't know it. */
 const char *
 node_get_platform(const node_t *node)
 {
-  (void)node;
-  UNIMPLEMENTED_NODELIST();
-  return NULL;
+  /* If we wanted, we could record the version in the routerstatus_t, since
+   * the consensus lists it.  We don't, though, so this function just won't
+   * work with microdescriptors. */
+  if (node->ri)
+    return node->ri->platform;
+  else
+    return NULL;
 }
 
-/** Return <b>node</b>'s time of publication. */
+/** Return <b>node</b>'s time of publication, or 0 if we don't have one. */
 time_t
 node_get_published_on(const node_t *node)
 {
-  (void)node;
-  UNIMPLEMENTED_NODELIST();
-  return 0;
+  if (node->ri)
+    return node->ri->cache_info.published_on;
+  else
+    return 0;
 }
 
 /** Return true iff <b>node</b> is one representing this router. */

src/or/rephist.c

@@ -881,8 +881,12 @@ rep_hist_get_router_stability_doc(time_t now)
     if (node) {
       char ip[INET_NTOA_BUF_LEN+1];
       char tbuf[ISO_TIME_LEN+1];
+      time_t published = node_get_published_on(node);
       node_get_address_string(node,ip,sizeof(ip));
-      format_iso_time(tbuf, node_get_published_on(node));
+      if (published > 0)
+        format_iso_time(tbuf, published);
+      else
+        strlcpy(tbuf, "???", sizeof(tbuf));
       tor_snprintf(header_buf, sizeof(header_buf),
                    "router %s %s %s\n"
                    "published %s\n"