netwerk/dns/PlatformDNSUnix.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim:set ts=4 sw=2 sts=2 et cin: */
   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
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "GetAddrInfo.h"
   8 #include "mozilla/net/DNSPacket.h"
   9 #include "nsIDNSService.h"
  10 #include "mozilla/Maybe.h"
  11 #include "mozilla/StaticPrefs_network.h"
  12 #include "mozilla/ThreadLocal.h"
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include <netinet/in.h>
  18 #include <resolv.h>
  19
  20 namespace mozilla::net {
  21
  22 #if defined(HAVE_RES_NINIT)
  23 MOZ_THREAD_LOCAL(struct __res_state*) sThreadRes;
  24 #endif
  25
  26 #define LOG(msg, ...) \
  27   MOZ_LOG(gGetAddrInfoLog, LogLevel::Debug, ("[DNS]: " msg, ##__VA_ARGS__))
  28
  29 nsresult ResolveHTTPSRecordImpl(const nsACString& aHost, uint16_t aFlags,
  30                                 TypeRecordResultType& aResult, uint32_t& aTTL) {
  31   DNSPacket packet;
  32   nsAutoCString host(aHost);
  33   nsAutoCString cname;
  34   nsresult rv;
  35
  36   if (xpc::IsInAutomation() &&
  37       !StaticPrefs::network_dns_native_https_query_in_automation()) {
  38     return NS_ERROR_UNKNOWN_HOST;
  39   }
  40
  41 #if defined(HAVE_RES_NINIT)
  42   if (!sThreadRes.get()) {
  43     UniquePtr<struct __res_state> resState(new struct __res_state);
  44     memset(resState.get(), 0, sizeof(struct __res_state));
  45     if (int ret = res_ninit(resState.get())) {
  46       LOG("res_ninit failed: %d", ret);
  47       return NS_ERROR_UNKNOWN_HOST;
  48     }
  49     sThreadRes.set(resState.release());
  50   }
  51 #endif
  52
  53   LOG("resolving %s\n", host.get());
  54   // Perform the query
  55   rv = packet.FillBuffer(
  56       [&](unsigned char response[DNSPacket::MAX_SIZE]) -> int {
  57         int len = 0;
  58 #if defined(HAVE_RES_NINIT)
  59         len = res_nquery(sThreadRes.get(), host.get(), ns_c_in,
  60                          nsIDNSService::RESOLVE_TYPE_HTTPSSVC, response,
  61                          DNSPacket::MAX_SIZE);
  62 #else
  63         len =
  64             res_query(host.get(), ns_c_in, nsIDNSService::RESOLVE_TYPE_HTTPSSVC,
  65                       response, DNSPacket::MAX_SIZE);
  66 #endif
  67
  68         if (len < 0) {
  69           LOG("DNS query failed");
  70         }
  71         return len;
  72       });
  73   if (NS_FAILED(rv)) {
  74     return rv;
  75   }
  76
  77   return ParseHTTPSRecord(host, packet, aResult, aTTL);
  78 }
  79
  80 void DNSThreadShutdown() {
  81 #if defined(HAVE_RES_NINIT)
  82   auto* res = sThreadRes.get();
  83   if (!res) {
  84     return;
  85   }
  86
  87   sThreadRes.set(nullptr);
  88   res_nclose(res);
  89 #endif
  90 }
  91
  92 }  // namespace mozilla::net