From bd10bf4b5bbe022f85bbf8d56e6afa50ad76bf60 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Thu, 14 Oct 2004 03:44:45 +0000
Subject: [PATCH] Try to always dtrt if routerlist==NULL

svn:r2489
---
 src/or/circuitbuild.c | 2 ++
 src/or/directory.c    | 3 ++-
 src/or/router.c       | 1 +
 src/or/routerlist.c   | 7 +++++--
 4 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/or/circuitbuild.c b/src/or/circuitbuild.c
index 56949da5de..b52f90dbae 100644
--- a/src/or/circuitbuild.c
+++ b/src/or/circuitbuild.c
@@ -989,6 +989,8 @@ onion_new_cpath_build_state(uint8_t purpose, const char *exit_digest)
   cpath_build_state_t *info;
   routerinfo_t *exit;
   router_get_routerlist(&rl);
+  if (!rl)
+    return NULL;
   r = new_route_len(options.PathlenCoinWeight, purpose, rl->routers);
   if (r < 1) /* must be at least 1 */
     return NULL;
diff --git a/src/or/directory.c b/src/or/directory.c
index ad33330352..e0ddcc37e9 100644
--- a/src/or/directory.c
+++ b/src/or/directory.c
@@ -554,7 +554,8 @@ connection_dir_client_reached_eof(connection_t *conn)
       return -1;
     }
     router_get_routerlist(&rl);
-    routerlist_update_from_runningrouters(rl,rrs);
+    if (rl)
+      routerlist_update_from_runningrouters(rl,rrs);
     running_routers_free(rrs);
   }
 
diff --git a/src/or/router.c b/src/or/router.c
index cf018efb04..5374631072 100644
--- a/src/or/router.c
+++ b/src/or/router.c
@@ -386,6 +386,7 @@ void router_retry_connections(void) {
   tor_assert(server_mode());
 
   router_get_routerlist(&rl);
+  if (!rl) return;
   for (i=0;i < smartlist_len(rl->routers);i++) {
     router = smartlist_get(rl->routers, i);
     if(router_is_me(router))
diff --git a/src/or/routerlist.c b/src/or/routerlist.c
index 7ca2e903ac..f3670a51a7 100644
--- a/src/or/routerlist.c
+++ b/src/or/routerlist.c
@@ -59,7 +59,7 @@ int router_reload_router_list(void)
       if (router_load_routerlist_from_directory(s, NULL, 0) < 0) {
         log_fn(LOG_WARN, "Cached directory '%s' was unparseable; ignoring.", filename);
       }
-      if( routerlist && routerlist->published_on > time(NULL) - OLD_MIN_ONION_KEY_LIFETIME/2) {
+      if(routerlist && routerlist->published_on > time(NULL) - OLD_MIN_ONION_KEY_LIFETIME/2) {
         /* XXX use new onion key lifetime when 0.0.8 servers are obsolete */
         directory_has_arrived(); /* do things we've been waiting to do */
       }
@@ -448,7 +448,8 @@ routerinfo_t *router_get_by_addr_port(uint32_t addr, uint16_t port) {
   int i;
   routerinfo_t *router;
 
-  tor_assert(routerlist);
+  if (!routerlist)
+    return NULL;
 
   for(i=0;i<smartlist_len(routerlist->routers);i++) {
     router = smartlist_get(routerlist->routers, i);
@@ -653,6 +654,7 @@ int router_add_to_routerlist(routerinfo_t *router) {
   routerinfo_t *r;
   char id_digest[DIGEST_LEN];
 
+  tor_assert(routerlist);
   crypto_pk_get_digest(router->identity_pkey, id_digest);
 
   /* If we have a router with this name, and the identity key is the same,
@@ -989,6 +991,7 @@ int router_compare_addr_to_exit_policy(uint32_t addr, uint16_t port,
 int router_exit_policy_all_routers_reject(uint32_t addr, uint16_t port) {
   int i;
   routerinfo_t *router;
+  if (!routerlist) return 1;
 
   for (i=0;i<smartlist_len(routerlist->routers);i++) {
     router = smartlist_get(routerlist->routers, i);