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-rw-r--r--netwerk/dns/PlatformDNSAndroid.cpp154
1 files changed, 154 insertions, 0 deletions
diff --git a/netwerk/dns/PlatformDNSAndroid.cpp b/netwerk/dns/PlatformDNSAndroid.cpp
new file mode 100644
index 0000000000..78a944777f
--- /dev/null
+++ b/netwerk/dns/PlatformDNSAndroid.cpp
@@ -0,0 +1,154 @@
+/* -*- 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