From fd68834b17fd5a83101f47c12102aec4517b7b27 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Tue, 30 Nov 2004 03:12:37 +0000
Subject: [PATCH] Give an early error if you pass a .onion or a .exit hostname
 to tor-resolve

svn:r3027
---
 src/tools/tor-resolve.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/tools/tor-resolve.c b/src/tools/tor-resolve.c
index a082f829a4..10600fb06f 100644
--- a/src/tools/tor-resolve.c
+++ b/src/tools/tor-resolve.c
@@ -204,6 +204,15 @@ main(int argc, char **argv)
     usage();
   }
 
+  if (!strcasecmpend(arg[0], ".onion") || !strcasecmpend(arg[0], ".exit")) {
+    const char *name_type = (!strcasecmpend(arg[0], ".exit")) ?
+      "an exit-local hostname" : "a hidden service";
+    fprintf(stderr, "%s is %s; those don't have IP addresses.\n\n"
+            "To connect to %s, you need to send the hostname to Tor;\n"
+            "we suggest SOCKS 4a.\n", arg[0], name_type, name_type);
+    return 1;
+  }
+
   if (do_resolve(arg[0], sockshost, socksport, &result))
     return 1;