tor-browser

The Tor Browser
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nriceresolver.h (4108B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
      5 * You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 // Original authors: jib@mozilla.com, ekr@rtfm.com
      8 
      9 // Some of this code is cut-and-pasted from nICEr. Copyright is:
     10 
     11 /*
     12 Copyright (c) 2007, Adobe Systems, Incorporated
     13 All rights reserved.
     14 
     15 Redistribution and use in source and binary forms, with or without
     16 modification, are permitted provided that the following conditions are
     17 met:
     18 
     19 * Redistributions of source code must retain the above copyright
     20  notice, this list of conditions and the following disclaimer.
     21 
     22 * Redistributions in binary form must reproduce the above copyright
     23  notice, this list of conditions and the following disclaimer in the
     24  documentation and/or other materials provided with the distribution.
     25 
     26 * Neither the name of Adobe Systems, Network Resonance nor the names of its
     27  contributors may be used to endorse or promote products derived from
     28  this software without specific prior written permission.
     29 
     30 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     31 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     32 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     33 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     34 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     35 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     36 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     37 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     38 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     39 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     40 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     41 */
     42 
     43 #ifndef nriceresolver_h__
     44 #define nriceresolver_h__
     45 
     46 #include "nricectx.h"
     47 #include "nsICancelable.h"
     48 #include "nsIDNSListener.h"
     49 #include "nsIDNSService.h"
     50 
     51 typedef struct nr_resolver_ nr_resolver;
     52 typedef struct nr_resolver_vtbl_ nr_resolver_vtbl;
     53 typedef struct nr_transport_addr_ nr_transport_addr;
     54 typedef struct nr_resolver_resource_ nr_resolver_resource;
     55 
     56 namespace mozilla {
     57 
     58 class NrIceResolver {
     59 private:
     60  ~NrIceResolver();
     61 
     62 public:
     63  NrIceResolver();
     64 
     65  nsresult Init();
     66  nr_resolver* AllocateResolver();
     67  void DestroyResolver();
     68  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(NrIceResolver)
     69 
     70  int resolve(nr_resolver_resource* resource,
     71              int (*cb)(void* cb_arg, nr_transport_addr* addr), void* cb_arg,
     72              void** handle);
     73 
     74 private:
     75  // Implementations of vtbl functions
     76  static int destroy(void** objp);
     77  static int resolve(void* obj, nr_resolver_resource* resource,
     78                     int (*cb)(void* cb_arg, nr_transport_addr* addr),
     79                     void* cb_arg, void** handle);
     80  static void resolve_cb(NR_SOCKET s, int how, void* cb_arg);
     81  static int cancel(void* obj, void* handle);
     82 
     83  class PendingResolution : public nsIDNSListener {
     84   public:
     85    PendingResolution(nsIEventTarget* thread, uint16_t port, int transport,
     86                      int (*cb)(void* cb_arg, nr_transport_addr* addr),
     87                      void* cb_arg)
     88        : thread_(thread),
     89          port_(port),
     90          transport_(transport),
     91          cb_(cb),
     92          cb_arg_(cb_arg) {}
     93    NS_IMETHOD OnLookupComplete(nsICancelable* request, nsIDNSRecord* record,
     94                                nsresult status) override;
     95 
     96    int cancel();
     97    nsCOMPtr<nsICancelable> request_;
     98    NS_DECL_THREADSAFE_ISUPPORTS
     99 
    100   private:
    101    virtual ~PendingResolution() = default;
    102 
    103    nsCOMPtr<nsIEventTarget> thread_;
    104    uint16_t port_;
    105    int transport_;
    106    int (*cb_)(void* cb_arg, nr_transport_addr* addr);
    107    void* cb_arg_;
    108  };
    109 
    110  nr_resolver_vtbl* vtbl_;
    111  nsCOMPtr<nsIEventTarget> sts_thread_;
    112  nsCOMPtr<nsIDNSService> dns_;
    113 #ifdef DEBUG
    114  int allocated_resolvers_;
    115 #endif
    116 };
    117 
    118 }  // End of namespace mozilla
    119 #endif