r8895@Kushana: nickm | 2006-09-21 20:05:11 -0400

Debug client-side reverse dns code.


svn:r8452

contrib/tor-resolve.py

@@ -36,7 +36,9 @@ def socks5ResolveRequest(hostname, atype=0x03, command=0xF0):
     version = 5
     rsv = 0
     port = 0
-    reqheader = struct.pack("!BBBBB",version, command, rsv, atype, len(hostname))
+    reqheader = struct.pack("!BBBB",version, command, rsv, atype)
+    if atype == 0x03:
+        reqheader += struct.pack("!B", len(hostname))
     portstr = struct.pack("!H",port)
     return "%s%s%s"%(reqheader,hostname,portstr)
 
@@ -62,8 +64,11 @@ def socks5ParseResponse(r):
             # not really the right way to format IPv6
             return "IPv6: %s"%(":".join([hex(ord(c)) for c in addr]))
     else:
-        nul = r.index('\0',4)
+        hlen, = struct.unpack("!B", r[4])
-        return r[4:nul]
+        expected_len = 5 + hlen + 2
+        if len(r) < expected_len:
+            return None
+        return r[5:-2]
 
 def socks5ResolvePTRRequest(hostname):
     return socks5ResolveRequest(socket.inet_aton(hostname),
@@ -105,7 +110,6 @@ def resolve(hostname, sockshost, socksport, socksver=4, reverse=0):
     if socksver == 5:
         s.send(socks5Hello())
         socks5ParseHello(s.recv(2))
-    print len(fmt(hostname)), len(hostname)
     s.send(fmt(hostname))
     answer = s.recv(6)
     result = parse(answer)
@@ -127,7 +131,7 @@ if __name__ == '__main__':
         sys.exit(0)
     socksver = 4
     reverse = 0
-    while sys.argv[1] == '-':
+    while sys.argv[1][0] == '-':
         if sys.argv[1] in ("-4", "-5"):
             socksver = int(sys.argv[1][1])
             del sys.argv[1]
@@ -138,7 +142,7 @@ if __name__ == '__main__':
             break
 
     if len(sys.argv) >= 4:
-        print "Syntax: resolve.py [-4|-5] hostname [sockshost:socksport]"
+        print "Syntax: resolve.py [-x] [-4|-5] hostname [sockshost:socksport]"
         sys.exit(0)
     if len(sys.argv) == 3:
         sh,sp = parseHostAndPort(sys.argv[2])

src/or/circuituse.c

@@ -947,7 +947,8 @@ circuit_get_open_circ_or_launch(edge_connection_t *conn,
   tor_assert(conn);
   tor_assert(circp);
   tor_assert(conn->_base.state == AP_CONN_STATE_CIRCUIT_WAIT);
-  is_resolve = conn->socks_request->command == SOCKS_COMMAND_RESOLVE;
+  is_resolve = (conn->socks_request->command == SOCKS_COMMAND_RESOLVE ||
+                conn->socks_request->command == SOCKS_COMMAND_RESOLVE_PTR);
 
   need_uptime = smartlist_string_num_isin(get_options()->LongLivedPorts,
                                           conn->socks_request->port);

src/or/connection_edge.c

@@ -1120,7 +1120,7 @@ connection_ap_handshake_rewrite_and_attach(edge_connection_t *conn,
       return -1;
     }
 
-    if (socks->command == SOCKS_COMMAND_RESOLVE) { // resolve_ptr XXXX NM
+    if (socks->command == SOCKS_COMMAND_RESOLVE) {
       uint32_t answer;
       struct in_addr in;
       /* Reply to resolves immediately if we can. */
@@ -1141,7 +1141,7 @@ connection_ap_handshake_rewrite_and_attach(edge_connection_t *conn,
         return 0;
       }
       rep_hist_note_used_resolve(time(NULL)); /* help predict this next time */
-    } else { /* socks->command == SOCKS_COMMAND_CONNECT */
+    } else if (socks->command == SOCKS_COMMAND_CONNECT) {
       if (socks->port == 0) {
         log_notice(LD_APP,"Application asked to connect to port 0. Refusing.");
         connection_mark_unattached_ap(conn, END_STREAM_REASON_TORPROTOCOL);
@@ -1166,6 +1166,12 @@ connection_ap_handshake_rewrite_and_attach(edge_connection_t *conn,
 
       /* help predict this next time */
       rep_hist_note_used_port(socks->port, time(NULL));
+    } else if (socks->command == SOCKS_COMMAND_RESOLVE_PTR) {
+      // XXXX NM Do anything here?
+
+      rep_hist_note_used_resolve(time(NULL)); /* help predict this next time */
+    } else {
+      tor_fragile_assert();
     }
     conn->_base.state = AP_CONN_STATE_CIRCUIT_WAIT;
     if ((circ &&
@@ -1701,10 +1707,10 @@ connection_ap_handshake_socks_resolved(edge_connection_t *conn,
       buf[1] = SOCKS5_SUCCEEDED;
       buf[2] = 0; /* reserved */
       buf[3] = 0x03; /* Domainname address type */
-      memcpy(buf+4, answer, answer_len); /* address */
+      buf[4] = (char)answer_len;
-      buf[4+answer_len] = '\0';
+      memcpy(buf+5, answer, answer_len); /* address */
-      set_uint16(buf+4+answer_len+1, 0); /* port == 0. */
+      set_uint16(buf+5+answer_len, 0); /* port == 0. */
-      replylen = 4+answer_len+1+2;
+      replylen = 5+answer_len+2;
     } else {
       buf[1] = SOCKS5_HOST_UNREACHABLE;
       memset(buf+2, 0, 8);

src/or/control.c

@@ -1435,7 +1435,8 @@ handle_getinfo_helper(const char *question, char **answer)
         case AP_CONN_STATE_CONTROLLER_WAIT:
         case AP_CONN_STATE_CIRCUIT_WAIT:
           if (conn->socks_request &&
-              conn->socks_request->command == SOCKS_COMMAND_RESOLVE)
+              (conn->socks_request->command == SOCKS_COMMAND_RESOLVE ||
+               conn->socks_request->command == SOCKS_COMMAND_RESOLVE_PTR))
             state = "NEWRESOLVE";
           else
             state = "NEW";

src/or/relay.c

@@ -865,7 +865,8 @@ connection_edge_process_relay_cell_not_open(
                "Dropping.");
       return 0;
     }
-    tor_assert(conn->socks_request->command == SOCKS_COMMAND_RESOLVE);
+    tor_assert(conn->socks_request->command == SOCKS_COMMAND_RESOLVE ||
+               conn->socks_request->command == SOCKS_COMMAND_RESOLVE_PTR);
     answer_len = cell->payload[RELAY_HEADER_SIZE+1];
     if (rh->length < 2 || answer_len+2>rh->length) {
       log_warn(LD_PROTOCOL, "Dropping malformed 'resolved' cell");