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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=4 sw=2 sts=2 et cin: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "GetAddrInfo.h"
#include "mozilla/glean/NetwerkMetrics.h"
#include "mozilla/net/DNSPacket.h"
#include "nsIDNSService.h"
#include "mozilla/Mutex.h"
#include "mozilla/StaticPrefs_network.h"
#include "mozilla/ThreadLocal.h"
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <resolv.h>
namespace mozilla::net {
#if defined(HAVE_RES_NINIT)
MOZ_THREAD_LOCAL(struct __res_state*) sThreadRes;
mozilla::StaticMutex sMutex MOZ_UNANNOTATED;
#endif
#define LOG(msg, ...) \
MOZ_LOG(gGetAddrInfoLog, LogLevel::Debug, ("[DNS]: " msg, ##__VA_ARGS__))
nsresult ResolveHTTPSRecordImpl(const nsACString& aHost,
nsIDNSService::DNSFlags aFlags,
TypeRecordResultType& aResult, uint32_t& aTTL) {
DNSPacket packet;
nsAutoCString host(aHost);
nsAutoCString cname;
nsresult rv;
if (xpc::IsInAutomation() &&
!StaticPrefs::network_dns_native_https_query_in_automation()) {
return NS_ERROR_UNKNOWN_HOST;
}
#if defined(HAVE_RES_NINIT)
if (!sThreadRes.get()) {
UniquePtr<struct __res_state> resState(new struct __res_state);
memset(resState.get(), 0, sizeof(struct __res_state));
{
StaticMutexAutoLock lock(sMutex);
if (int ret = res_ninit(resState.get())) {
LOG("res_ninit failed: %d", ret);
return NS_ERROR_UNKNOWN_HOST;
}
}
sThreadRes.set(resState.release());
}
#endif
LOG("resolving %s\n", host.get());
// Perform the query
rv = packet.FillBuffer(
[&](unsigned char response[DNSPacket::MAX_SIZE]) -> int {
int len = 0;
TimeStamp startTime = TimeStamp::Now();
#if defined(HAVE_RES_NINIT)
len = res_nquery(sThreadRes.get(), host.get(), ns_c_in,
nsIDNSService::RESOLVE_TYPE_HTTPSSVC, response,
DNSPacket::MAX_SIZE);
#else
len =
res_query(host.get(), ns_c_in, nsIDNSService::RESOLVE_TYPE_HTTPSSVC,
response, DNSPacket::MAX_SIZE);
#endif
mozilla::glean::networking::dns_native_https_call_time
.AccumulateRawDuration(TimeStamp::Now() - startTime);
if (len < 0) {
LOG("DNS query failed");
}
return len;
});
if (NS_FAILED(rv)) {
return rv;
}
return ParseHTTPSRecord(host, packet, aResult, aTTL);
}
void DNSThreadShutdown() {
#if defined(HAVE_RES_NINIT)
auto* res = sThreadRes.get();
if (!res) {
return;
}
sThreadRes.set(nullptr);
{
StaticMutexAutoLock lock(sMutex);
res_nclose(res);
}
free(res);
#endif
}
} // namespace mozilla::net
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