Introduce END_STREAM_REASON_NOROUTE

changes/misc-reason

@@ -1,3 +1,4 @@
   o Minor bugfixes:
     - Exit nodes didn't recognize EHOSTUNREACH as a stream ending reason
-      and sent back misc. Bugfix on 0.1.0.1-rc; fixes bug 1793.
+      and sent back END_STREAM_REASON_NOROUTE. Also update the spec to
+      reflect this new reason. Bugfix on 0.1.0.1-rc; fixes bug 1793.

doc/spec/tor-spec.txt

@@ -831,7 +831,8 @@ see tor-design.pdf.
        6 -- REASON_DONE           (Anonymized TCP connection was closed)
        7 -- REASON_TIMEOUT        (Connection timed out, or OR timed out
                                    while connecting)
-       8 -- (unallocated) [**]
+       8 -- REASON_NOROUTE        (Routing error while attempting to
+                                   contact destination)
        9 -- REASON_HIBERNATING    (OR is temporarily hibernating)
       10 -- REASON_INTERNAL       (Internal error at the OR)
       11 -- REASON_RESOURCELIMIT  (OR has no resources to fulfill request)
@@ -853,8 +854,6 @@ see tor-design.pdf.
 
    [*] Older versions of Tor also send this reason when connections are
        reset.
-   [**] Due to a bug in versions of Tor through 0095, error reason 8 must
-        remain allocated until that version is obsolete.
 
    --- [The rest of this section describes unimplemented functionality.]
 

src/or/or.h

@@ -544,7 +544,7 @@ typedef enum {
 #define END_STREAM_REASON_DESTROY 5
 #define END_STREAM_REASON_DONE 6
 #define END_STREAM_REASON_TIMEOUT 7
-/* 8 is unallocated for historical reasons. */
+#define END_STREAM_REASON_NOROUTE 8
 #define END_STREAM_REASON_HIBERNATING 9
 #define END_STREAM_REASON_INTERNAL 10
 #define END_STREAM_REASON_RESOURCELIMIT 11

src/or/reasons.c

@@ -26,6 +26,7 @@ stream_end_reason_to_control_string(int reason)
     case END_STREAM_REASON_DESTROY: return "DESTROY";
     case END_STREAM_REASON_DONE: return "DONE";
     case END_STREAM_REASON_TIMEOUT: return "TIMEOUT";
+    case END_STREAM_REASON_NOROUTE: "return "NOROUTE";
     case END_STREAM_REASON_HIBERNATING: return "HIBERNATING";
     case END_STREAM_REASON_INTERNAL: return "INTERNAL";
     case END_STREAM_REASON_RESOURCELIMIT: return "RESOURCELIMIT";
@@ -60,6 +61,7 @@ stream_end_reason_to_string(int reason)
     case END_STREAM_REASON_DESTROY:        return "destroyed";
     case END_STREAM_REASON_DONE:           return "closed normally";
     case END_STREAM_REASON_TIMEOUT:        return "gave up (timeout)";
+    case END_STREAM_REASON_NOROUTE:        return "no route to host";
     case END_STREAM_REASON_HIBERNATING:    return "server is hibernating";
     case END_STREAM_REASON_INTERNAL:       return "internal error at server";
     case END_STREAM_REASON_RESOURCELIMIT:  return "server out of resources";
@@ -102,6 +104,8 @@ stream_end_reason_to_socks5_response(int reason)
       return SOCKS5_SUCCEEDED;
     case END_STREAM_REASON_TIMEOUT:
       return SOCKS5_TTL_EXPIRED;
+    case END_STREAM_REASON_NOROUTE:
+      return SOCKS5_HOST_UNREACHABLE;
     case END_STREAM_REASON_RESOURCELIMIT:
       return SOCKS5_GENERAL_ERROR;
     case END_STREAM_REASON_HIBERNATING:
@@ -161,8 +165,9 @@ errno_to_stream_end_reason(int e)
     E_CASE(EACCES):
     S_CASE(ENOTCONN):
     S_CASE(ENETUNREACH):
-    E_CASE(EHOSTUNREACH):
       return END_STREAM_REASON_INTERNAL;
+    E_CASE(EHOSTUNREACH):
+      return END_STREAM_REASON_NOROUTE;
     S_CASE(ECONNREFUSED):
       return END_STREAM_REASON_CONNECTREFUSED;
     S_CASE(ECONNRESET):