From 4c789ec08c8d52c3aab3ab775a86fe2350d584b5 Mon Sep 17 00:00:00 2001
From: Sebastian Hahn <sebastian@torproject.org>
Date: Tue, 26 Apr 2011 05:07:37 +0200
Subject: Don't leak the local hostname in relay nicknames

Fixes bug 2979, reported by tagnaq.
---
 src/or/config.c | 55 -------------------------------------------------------
 1 file changed, 55 deletions(-)

(limited to 'src/or/config.c')

diff --git a/src/or/config.c b/src/or/config.c
index 3770301370..9675c73c99 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -2500,54 +2500,6 @@ is_local_addr(const tor_addr_t *addr)
   return 0;
 }
 
-/** Called when we don't have a nickname set.  Try to guess a good nickname
- * based on the hostname, and return it in a newly allocated string. If we
- * can't, return NULL and let the caller warn if it wants to. */
-static char *
-get_default_nickname(void)
-{
-  static const char * const bad_default_nicknames[] = {
-    "localhost",
-    NULL,
-  };
-  char localhostname[256];
-  char *cp, *out, *outp;
-  int i;
-
-  if (gethostname(localhostname, sizeof(localhostname)) < 0)
-    return NULL;
-
-  /* Put it in lowercase; stop at the first dot. */
-  if ((cp = strchr(localhostname, '.')))
-    *cp = '\0';
-  tor_strlower(localhostname);
-
-  /* Strip invalid characters. */
-  cp = localhostname;
-  out = outp = tor_malloc(strlen(localhostname) + 1);
-  while (*cp) {
-    if (strchr(LEGAL_NICKNAME_CHARACTERS, *cp))
-      *outp++ = *cp++;
-    else
-      cp++;
-  }
-  *outp = '\0';
-
-  /* Enforce length. */
-  if (strlen(out) > MAX_NICKNAME_LEN)
-    out[MAX_NICKNAME_LEN]='\0';
-
-  /* Check for dumb names. */
-  for (i = 0; bad_default_nicknames[i]; ++i) {
-    if (!strcmp(out, bad_default_nicknames[i])) {
-      tor_free(out);
-      return NULL;
-    }
-  }
-
-  return out;
-}
-
 /** Release storage held by <b>options</b>. */
 static void
 config_free(config_format_t *fmt, void *options)
@@ -2976,14 +2928,7 @@ options_validate(or_options_t *old_options, or_options_t *options,
 
   if (options->Nickname == NULL) {
     if (server_mode(options)) {
-      if (!(options->Nickname = get_default_nickname())) {
-        log_notice(LD_CONFIG, "Couldn't pick a nickname based on "
-                   "our hostname; using %s instead.", UNNAMED_ROUTER_NICKNAME);
         options->Nickname = tor_strdup(UNNAMED_ROUTER_NICKNAME);
-      } else {
-        log_notice(LD_CONFIG, "Choosing default nickname '%s'",
-                   options->Nickname);
-      }
     }
   } else {
     if (!is_legal_nickname(options->Nickname)) {
-- 
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