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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/net/DNSPacket.h"
#include "nsIDNSService.h"
#include "mozilla/Maybe.h"
#include "mozilla/Atomics.h"
#include "mozilla/StaticPrefs_network.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <resolv.h>
#include <poll.h>
#include <dlfcn.h>
#include <android/multinetwork.h>
namespace mozilla::net {
// The first call to ResolveHTTPSRecordImpl will load the library
// and function pointers.
static Atomic<bool> sLibLoading{false};
// https://developer.android.com/ndk/reference/group/networking#android_res_nquery
// The function android_res_nquery is defined in <android/multinetwork.h>
typedef int (*android_res_nquery_ptr)(net_handle_t network, const char* dname,
int ns_class, int ns_type,
uint32_t flags);
static Atomic<android_res_nquery_ptr> sAndroidResNQuery;
#define LOG(msg, ...) \
MOZ_LOG(gGetAddrInfoLog, LogLevel::Debug, ("[DNS]: " msg, ##__VA_ARGS__))
nsresult ResolveHTTPSRecordImpl(const nsACString& aHost, uint16_t 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 (!sLibLoading.exchange(true)) {
// We're the first call here, load the library and symbols.
void* handle = dlopen("libandroid.so", RTLD_LAZY | RTLD_LOCAL);
if (!handle) {
LOG("Error loading libandroid_net %s", dlerror());
return NS_ERROR_UNKNOWN_HOST;
}
auto x = dlsym(handle, "android_res_nquery");
if (!x) {
LOG("No android_res_nquery symbol");
}
sAndroidResNQuery = (android_res_nquery_ptr)x;
}
if (!sAndroidResNQuery) {
LOG("nquery not loaded");
// The library hasn't been loaded yet.
return NS_ERROR_UNKNOWN_HOST;
}
LOG("resolving %s\n", host.get());
// Perform the query
rv = packet.FillBuffer(
[&](unsigned char response[DNSPacket::MAX_SIZE]) -> int {
int fd = 0;
auto closeSocket = MakeScopeExit([&] {
if (fd > 0) {
close(fd);
}
});
uint32_t flags = 0;
if (aFlags & nsIDNSService::RESOLVE_BYPASS_CACHE) {
flags = ANDROID_RESOLV_NO_CACHE_LOOKUP;
}
fd = sAndroidResNQuery(0, host.get(), ns_c_in,
nsIDNSService::RESOLVE_TYPE_HTTPSSVC, flags);
if (fd < 0) {
LOG("DNS query failed");
return fd;
}
struct pollfd fds;
fds.fd = fd;
fds.events = POLLIN; // Wait for read events
// Wait for an event on the file descriptor
int ret = poll(&fds, 1,
StaticPrefs::network_dns_native_https_timeout_android());
if (ret <= 0) {
LOG("poll failed %d", ret);
return -1;
}
ssize_t len = recv(fd, response, DNSPacket::MAX_SIZE - 1, 0);
if (len <= 8) {
LOG("size too small %zd", len);
return len < 0 ? len : -1;
}
// The first 8 bytes are UDP header.
// XXX: we should consider avoiding this move somehow.
for (int i = 0; i < len - 8; i++) {
response[i] = response[i + 8];
}
return len - 8;
});
if (NS_FAILED(rv)) {
LOG("failed rv");
return rv;
}
packet.SetNativePacket(true);
int32_t loopCount = 64;
while (loopCount > 0 && aResult.is<Nothing>()) {
loopCount--;
DOHresp resp;
nsClassHashtable<nsCStringHashKey, DOHresp> additionalRecords;
rv = packet.Decode(host, TRRTYPE_HTTPSSVC, cname, true, resp, aResult,
additionalRecords, aTTL);
if (NS_FAILED(rv)) {
LOG("Decode failed %x", static_cast<uint32_t>(rv));
return rv;
}
if (!cname.IsEmpty() && aResult.is<Nothing>()) {
host = cname;
cname.Truncate();
continue;
}
}
if (aResult.is<Nothing>()) {
LOG("Result is nothing");
// The call succeeded, but no HTTPS records were found.
return NS_ERROR_UNKNOWN_HOST;
}
return NS_OK;
}
} // namespace mozilla::net
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