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/glean/GleanMetrics.h"
   9 #include "mozilla/net/DNSPacket.h"
  10 #include "nsIDNSService.h"
  11 #include "mozilla/Maybe.h"
  12 #include "mozilla/StaticPrefs_network.h"
  13 #include "mozilla/ThreadLocal.h"
  14
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <netinet/in.h>
  19 #include <resolv.h>
  20
  21 namespace mozilla::net {
  22
  23 #if defined(HAVE_RES_NINIT)
  24 MOZ_THREAD_LOCAL(struct __res_state*) sThreadRes;
  25 #endif
  26
  27 #define LOG(msg, ...) \
  28   MOZ_LOG(gGetAddrInfoLog, LogLevel::Debug, ("[DNS]: " msg, ##__VA_ARGS__))
  29
  30 nsresult ResolveHTTPSRecordImpl(const nsACString& aHost, uint16_t aFlags,
  31                                 TypeRecordResultType& aResult, uint32_t& aTTL) {
  32   DNSPacket packet;
  33   nsAutoCString host(aHost);
  34   nsAutoCString cname;
  35   nsresult rv;
  36
  37   if (xpc::IsInAutomation() &&
  38       !StaticPrefs::network_dns_native_https_query_in_automation()) {
  39     return NS_ERROR_UNKNOWN_HOST;
  40   }
  41
  42 #if defined(HAVE_RES_NINIT)
  43   if (!sThreadRes.get()) {
  44     UniquePtr<struct __res_state> resState(new struct __res_state);
  45     memset(resState.get(), 0, sizeof(struct __res_state));
  46     if (int ret = res_ninit(resState.get())) {
  47       LOG("res_ninit failed: %d", ret);
  48       return NS_ERROR_UNKNOWN_HOST;
  49     }
  50     sThreadRes.set(resState.release());
  51   }
  52 #endif
  53
  54   LOG("resolving %s\n", host.get());
  55   // Perform the query
  56   rv = packet.FillBuffer(
  57       [&](unsigned char response[DNSPacket::MAX_SIZE]) -> int {
  58         int len = 0;
  59         TimeStamp startTime = TimeStamp::Now();
  60 #if defined(HAVE_RES_NINIT)
  61         len = res_nquery(sThreadRes.get(), host.get(), ns_c_in,
  62                          nsIDNSService::RESOLVE_TYPE_HTTPSSVC, response,
  63                          DNSPacket::MAX_SIZE);
  64 #else
  65         len =
  66             res_query(host.get(), ns_c_in, nsIDNSService::RESOLVE_TYPE_HTTPSSVC,
  67                       response, DNSPacket::MAX_SIZE);
  68 #endif
  69
  70         mozilla::glean::networking::dns_native_https_call_time
  71             .AccumulateRawDuration(TimeStamp::Now() - startTime);
  72         if (len < 0) {
  73           LOG("DNS query failed");
  74         }
  75         return len;
  76       });
  77   if (NS_FAILED(rv)) {
  78     return rv;
  79   }
  80
  81   return ParseHTTPSRecord(host, packet, aResult, aTTL);
  82 }
  83
  84 void DNSThreadShutdown() {
  85 #if defined(HAVE_RES_NINIT)
  86   auto* res = sThreadRes.get();
  87   if (!res) {
  88     return;
  89   }
  90
  91   sThreadRes.set(nullptr);
  92   res_nclose(res);
  93 #endif
  94 }
  95
  96 }  // namespace mozilla::net