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cares_wrap.cc
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "cares_wrap.h"
#include "ada.h"
#include "async_wrap-inl.h"
#include "base_object-inl.h"
#include "env-inl.h"
#include "memory_tracker-inl.h"
#include "nbytes.h"
#include "node.h"
#include "node_errors.h"
#include "node_external_reference.h"
#include "req_wrap-inl.h"
#include "util-inl.h"
#include "uv.h"
#include "v8.h"
#include <cerrno>
#include <cstring>
#include <memory>
#include <vector>
#include <unordered_set>
#ifndef T_CAA
# define T_CAA 257 /* Certification Authority Authorization */
#endif
// OpenBSD does not define these
#ifndef AI_ALL
# define AI_ALL 0
#endif
#ifndef AI_V4MAPPED
# define AI_V4MAPPED 0
#endif
namespace node {
namespace cares_wrap {
using v8::Array;
using v8::Context;
using v8::EscapableHandleScope;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Int32;
using v8::Integer;
using v8::Isolate;
using v8::Just;
using v8::JustVoid;
using v8::Local;
using v8::Maybe;
using v8::Nothing;
using v8::Null;
using v8::Object;
using v8::String;
using v8::Uint32;
using v8::Value;
namespace {
Mutex ares_library_mutex;
inline uint16_t cares_get_16bit(const unsigned char* p) {
return static_cast<uint32_t>(p[0] << 8U) | (static_cast<uint32_t>(p[1]));
}
void ares_poll_cb(uv_poll_t* watcher, int status, int events) {
NodeAresTask* task = ContainerOf(&NodeAresTask::poll_watcher, watcher);
ChannelWrap* channel = task->channel;
/* Reset the idle timer */
uv_timer_again(channel->timer_handle());
if (status < 0) {
/* An error happened. Just pretend that the socket is both readable and */
/* writable. */
ares_process_fd(channel->cares_channel(), task->sock, task->sock);
return;
}
/* Process DNS responses */
ares_process_fd(channel->cares_channel(),
events & UV_READABLE ? task->sock : ARES_SOCKET_BAD,
events & UV_WRITABLE ? task->sock : ARES_SOCKET_BAD);
}
void ares_poll_close_cb(uv_poll_t* watcher) {
std::unique_ptr<NodeAresTask> free_me(
ContainerOf(&NodeAresTask::poll_watcher, watcher));
}
/* Callback from ares when socket operation is started */
void ares_sockstate_cb(void* data, ares_socket_t sock, int read, int write) {
ChannelWrap* channel = static_cast<ChannelWrap*>(data);
NodeAresTask* task;
NodeAresTask lookup_task;
lookup_task.sock = sock;
auto it = channel->task_list()->find(&lookup_task);
task = (it == channel->task_list()->end()) ? nullptr : *it;
if (read || write) {
if (!task) {
/* New socket */
channel->StartTimer();
task = NodeAresTask::Create(channel, sock);
if (task == nullptr) {
/* This should never happen unless we're out of memory or something */
/* is seriously wrong. The socket won't be polled, but the query will */
/* eventually time out. */
return;
}
channel->task_list()->insert(task);
}
/* This should never fail. If it fails anyway, the query will eventually */
/* time out. */
uv_poll_start(&task->poll_watcher,
(read ? UV_READABLE : 0) | (write ? UV_WRITABLE : 0),
ares_poll_cb);
} else {
if (task != nullptr) {
channel->task_list()->erase(it);
channel->env()->CloseHandle(&task->poll_watcher, ares_poll_close_cb);
}
if (channel->task_list()->empty()) {
channel->CloseTimer();
}
}
}
Local<Array> HostentToNames(Environment* env, struct hostent* host) {
EscapableHandleScope scope(env->isolate());
std::vector<Local<Value>> names;
for (uint32_t i = 0; host->h_aliases[i] != nullptr; ++i)
names.emplace_back(OneByteString(env->isolate(), host->h_aliases[i]));
Local<Array> ret = Array::New(env->isolate(), names.data(), names.size());
return scope.Escape(ret);
}
Local<Array> HostentToNames(Environment* env,
struct hostent* host,
Local<Array> names) {
size_t offset = names->Length();
for (uint32_t i = 0; host->h_aliases[i] != nullptr; ++i) {
names->Set(
env->context(),
i + offset,
OneByteString(env->isolate(), host->h_aliases[i])).Check();
}
return names;
}
template <typename T>
Local<Array> AddrTTLToArray(
Environment* env,
const T* addrttls,
size_t naddrttls) {
MaybeStackBuffer<Local<Value>, 8> ttls(naddrttls);
for (size_t i = 0; i < naddrttls; i++)
ttls[i] = Integer::NewFromUnsigned(env->isolate(), addrttls[i].ttl);
return Array::New(env->isolate(), ttls.out(), naddrttls);
}
int ParseGeneralReply(
Environment* env,
const unsigned char* buf,
int len,
int* type,
Local<Array> ret,
void* addrttls = nullptr,
int* naddrttls = nullptr) {
HandleScope handle_scope(env->isolate());
hostent* host;
int status;
switch (*type) {
case ns_t_a:
case ns_t_cname:
case ns_t_cname_or_a:
status = ares_parse_a_reply(buf,
len,
&host,
static_cast<ares_addrttl*>(addrttls),
naddrttls);
break;
case ns_t_aaaa:
status = ares_parse_aaaa_reply(buf,
len,
&host,
static_cast<ares_addr6ttl*>(addrttls),
naddrttls);
break;
case ns_t_ns:
status = ares_parse_ns_reply(buf, len, &host);
break;
case ns_t_ptr:
status = ares_parse_ptr_reply(buf, len, nullptr, 0, AF_INET, &host);
break;
default:
UNREACHABLE("Bad NS type");
}
if (status != ARES_SUCCESS)
return status;
CHECK_NOT_NULL(host);
HostEntPointer ptr(host);
/* If it's `CNAME`, return the CNAME value;
* And if it's `CNAME_OR_A` and it has value in `h_name` and `h_aliases[0]`,
* we consider it's a CNAME record, otherwise we consider it's an A record. */
if ((*type == ns_t_cname_or_a && ptr->h_name && ptr->h_aliases[0]) ||
*type == ns_t_cname) {
// A cname lookup always returns a single record but we follow the
// common API here.
*type = ns_t_cname;
ret->Set(env->context(),
ret->Length(),
OneByteString(env->isolate(), ptr->h_name)).Check();
return ARES_SUCCESS;
}
if (*type == ns_t_cname_or_a)
*type = ns_t_a;
if (*type == ns_t_ns) {
HostentToNames(env, ptr.get(), ret);
} else if (*type == ns_t_ptr) {
uint32_t offset = ret->Length();
for (uint32_t i = 0; ptr->h_aliases[i] != nullptr; i++) {
auto alias = OneByteString(env->isolate(), ptr->h_aliases[i]);
ret->Set(env->context(), i + offset, alias).Check();
}
} else {
uint32_t offset = ret->Length();
char ip[INET6_ADDRSTRLEN];
for (uint32_t i = 0; ptr->h_addr_list[i] != nullptr; ++i) {
uv_inet_ntop(ptr->h_addrtype, ptr->h_addr_list[i], ip, sizeof(ip));
auto address = OneByteString(env->isolate(), ip);
ret->Set(env->context(), i + offset, address).Check();
}
}
return ARES_SUCCESS;
}
int ParseMxReply(
Environment* env,
const unsigned char* buf,
int len,
Local<Array> ret,
bool need_type = false) {
HandleScope handle_scope(env->isolate());
struct ares_mx_reply* mx_start;
int status = ares_parse_mx_reply(buf, len, &mx_start);
if (status != ARES_SUCCESS)
return status;
uint32_t offset = ret->Length();
ares_mx_reply* current = mx_start;
for (uint32_t i = 0; current != nullptr; ++i, current = current->next) {
Local<Object> mx_record = Object::New(env->isolate());
mx_record->Set(env->context(),
env->exchange_string(),
OneByteString(env->isolate(), current->host)).Check();
mx_record->Set(env->context(),
env->priority_string(),
Integer::New(env->isolate(), current->priority)).Check();
if (need_type)
mx_record->Set(env->context(),
env->type_string(),
env->dns_mx_string()).Check();
ret->Set(env->context(), i + offset, mx_record).Check();
}
ares_free_data(mx_start);
return ARES_SUCCESS;
}
int ParseCaaReply(
Environment* env,
const unsigned char* buf,
int len,
Local<Array> ret,
bool need_type = false) {
HandleScope handle_scope(env->isolate());
struct ares_caa_reply* caa_start;
int status = ares_parse_caa_reply(buf, len, &caa_start);
if (status != ARES_SUCCESS)
return status;
uint32_t offset = ret->Length();
ares_caa_reply* current = caa_start;
for (uint32_t i = 0; current != nullptr; ++i, current = current->next) {
Local<Object> caa_record = Object::New(env->isolate());
caa_record->Set(env->context(),
env->dns_critical_string(),
Integer::New(env->isolate(), current->critical)).Check();
caa_record->Set(env->context(),
OneByteString(env->isolate(), current->property),
OneByteString(env->isolate(), current->value)).Check();
if (need_type)
caa_record->Set(env->context(),
env->type_string(),
env->dns_caa_string()).Check();
ret->Set(env->context(), i + offset, caa_record).Check();
}
ares_free_data(caa_start);
return ARES_SUCCESS;
}
int ParseTxtReply(
Environment* env,
const unsigned char* buf,
int len,
Local<Array> ret,
bool need_type = false) {
HandleScope handle_scope(env->isolate());
struct ares_txt_ext* txt_out;
int status = ares_parse_txt_reply_ext(buf, len, &txt_out);
if (status != ARES_SUCCESS)
return status;
Local<Array> txt_chunk;
struct ares_txt_ext* current = txt_out;
uint32_t i = 0, j;
uint32_t offset = ret->Length();
for (j = 0; current != nullptr; current = current->next) {
Local<String> txt =
OneByteString(env->isolate(), current->txt, current->length);
// New record found - write out the current chunk
if (current->record_start) {
if (!txt_chunk.IsEmpty()) {
if (need_type) {
Local<Object> elem = Object::New(env->isolate());
elem->Set(env->context(), env->entries_string(), txt_chunk).Check();
elem->Set(env->context(),
env->type_string(),
env->dns_txt_string()).Check();
ret->Set(env->context(), offset + i++, elem).Check();
} else {
ret->Set(env->context(), offset + i++, txt_chunk).Check();
}
}
txt_chunk = Array::New(env->isolate());
j = 0;
}
txt_chunk->Set(env->context(), j++, txt).Check();
}
// Push last chunk if it isn't empty
if (!txt_chunk.IsEmpty()) {
if (need_type) {
Local<Object> elem = Object::New(env->isolate());
elem->Set(env->context(), env->entries_string(), txt_chunk).Check();
elem->Set(env->context(),
env->type_string(),
env->dns_txt_string()).Check();
ret->Set(env->context(), offset + i, elem).Check();
} else {
ret->Set(env->context(), offset + i, txt_chunk).Check();
}
}
ares_free_data(txt_out);
return ARES_SUCCESS;
}
int ParseSrvReply(
Environment* env,
const unsigned char* buf,
int len,
Local<Array> ret,
bool need_type = false) {
HandleScope handle_scope(env->isolate());
struct ares_srv_reply* srv_start;
int status = ares_parse_srv_reply(buf, len, &srv_start);
if (status != ARES_SUCCESS)
return status;
ares_srv_reply* current = srv_start;
int offset = ret->Length();
for (uint32_t i = 0; current != nullptr; ++i, current = current->next) {
Local<Object> srv_record = Object::New(env->isolate());
srv_record->Set(env->context(),
env->name_string(),
OneByteString(env->isolate(), current->host)).Check();
srv_record->Set(env->context(),
env->port_string(),
Integer::New(env->isolate(), current->port)).Check();
srv_record->Set(env->context(),
env->priority_string(),
Integer::New(env->isolate(), current->priority)).Check();
srv_record->Set(env->context(),
env->weight_string(),
Integer::New(env->isolate(), current->weight)).Check();
if (need_type)
srv_record->Set(env->context(),
env->type_string(),
env->dns_srv_string()).Check();
ret->Set(env->context(), i + offset, srv_record).Check();
}
ares_free_data(srv_start);
return ARES_SUCCESS;
}
int ParseNaptrReply(
Environment* env,
const unsigned char* buf,
int len,
Local<Array> ret,
bool need_type = false) {
HandleScope handle_scope(env->isolate());
ares_naptr_reply* naptr_start;
int status = ares_parse_naptr_reply(buf, len, &naptr_start);
if (status != ARES_SUCCESS)
return status;
ares_naptr_reply* current = naptr_start;
int offset = ret->Length();
for (uint32_t i = 0; current != nullptr; ++i, current = current->next) {
Local<Object> naptr_record = Object::New(env->isolate());
naptr_record->Set(env->context(),
env->flags_string(),
OneByteString(env->isolate(), current->flags)).Check();
naptr_record->Set(env->context(),
env->service_string(),
OneByteString(env->isolate(),
current->service)).Check();
naptr_record->Set(env->context(),
env->regexp_string(),
OneByteString(env->isolate(),
current->regexp)).Check();
naptr_record->Set(env->context(),
env->replacement_string(),
OneByteString(env->isolate(),
current->replacement)).Check();
naptr_record->Set(env->context(),
env->order_string(),
Integer::New(env->isolate(), current->order)).Check();
naptr_record->Set(env->context(),
env->preference_string(),
Integer::New(env->isolate(),
current->preference)).Check();
if (need_type)
naptr_record->Set(env->context(),
env->type_string(),
env->dns_naptr_string()).Check();
ret->Set(env->context(), i + offset, naptr_record).Check();
}
ares_free_data(naptr_start);
return ARES_SUCCESS;
}
int ParseSoaReply(
Environment* env,
unsigned char* buf,
int len,
Local<Object>* ret) {
EscapableHandleScope handle_scope(env->isolate());
// Manage memory using standardard smart pointer std::unique_tr
struct AresDeleter {
void operator()(char* ptr) const noexcept { ares_free_string(ptr); }
};
using ares_unique_ptr = std::unique_ptr<char[], AresDeleter>;
// Can't use ares_parse_soa_reply() here which can only parse single record
const unsigned int ancount = cares_get_16bit(buf + 6);
unsigned char* ptr = buf + NS_HFIXEDSZ;
char* name_temp = nullptr;
long temp_len; // NOLINT(runtime/int)
int status = ares_expand_name(ptr, buf, len, &name_temp, &temp_len);
if (status != ARES_SUCCESS) {
// returns EBADRESP in case of invalid input
return status == ARES_EBADNAME ? ARES_EBADRESP : status;
}
const ares_unique_ptr name(name_temp);
if (ptr + temp_len + NS_QFIXEDSZ > buf + len) {
return ARES_EBADRESP;
}
ptr += temp_len + NS_QFIXEDSZ;
for (unsigned int i = 0; i < ancount; i++) {
char* rr_name_temp = nullptr;
long rr_temp_len; // NOLINT(runtime/int)
int status2 = ares_expand_name(ptr, buf, len, &rr_name_temp, &rr_temp_len);
if (status2 != ARES_SUCCESS)
return status2 == ARES_EBADNAME ? ARES_EBADRESP : status2;
const ares_unique_ptr rr_name(rr_name_temp);
ptr += rr_temp_len;
if (ptr + NS_RRFIXEDSZ > buf + len) {
return ARES_EBADRESP;
}
const int rr_type = cares_get_16bit(ptr);
const int rr_len = cares_get_16bit(ptr + 8);
ptr += NS_RRFIXEDSZ;
// only need SOA
if (rr_type == ns_t_soa) {
char* nsname_temp = nullptr;
long nsname_temp_len; // NOLINT(runtime/int)
int status3 = ares_expand_name(ptr, buf, len,
&nsname_temp,
&nsname_temp_len);
if (status3 != ARES_SUCCESS) {
return status3 == ARES_EBADNAME ? ARES_EBADRESP : status3;
}
const ares_unique_ptr nsname(nsname_temp);
ptr += nsname_temp_len;
char* hostmaster_temp = nullptr;
long hostmaster_temp_len; // NOLINT(runtime/int)
int status4 = ares_expand_name(ptr, buf, len,
&hostmaster_temp,
&hostmaster_temp_len);
if (status4 != ARES_SUCCESS) {
return status4 == ARES_EBADNAME ? ARES_EBADRESP : status4;
}
const ares_unique_ptr hostmaster(hostmaster_temp);
ptr += hostmaster_temp_len;
if (ptr + 5 * 4 > buf + len) {
return ARES_EBADRESP;
}
const unsigned int serial = nbytes::ReadUint32BE(ptr + 0 * 4);
const unsigned int refresh = nbytes::ReadUint32BE(ptr + 1 * 4);
const unsigned int retry = nbytes::ReadUint32BE(ptr + 2 * 4);
const unsigned int expire = nbytes::ReadUint32BE(ptr + 3 * 4);
const unsigned int minttl = nbytes::ReadUint32BE(ptr + 4 * 4);
Local<Object> soa_record = Object::New(env->isolate());
soa_record->Set(env->context(),
env->nsname_string(),
OneByteString(env->isolate(), nsname.get())).Check();
soa_record->Set(env->context(),
env->hostmaster_string(),
OneByteString(env->isolate(),
hostmaster.get())).Check();
soa_record->Set(env->context(),
env->serial_string(),
Integer::NewFromUnsigned(env->isolate(), serial)).Check();
soa_record->Set(env->context(),
env->refresh_string(),
Integer::New(env->isolate(), refresh)).Check();
soa_record->Set(env->context(),
env->retry_string(),
Integer::New(env->isolate(), retry)).Check();
soa_record->Set(env->context(),
env->expire_string(),
Integer::New(env->isolate(), expire)).Check();
soa_record->Set(env->context(),
env->minttl_string(),
Integer::NewFromUnsigned(env->isolate(), minttl)).Check();
soa_record->Set(env->context(),
env->type_string(),
env->dns_soa_string()).Check();
*ret = handle_scope.Escape(soa_record);
break;
}
ptr += rr_len;
}
return ARES_SUCCESS;
}
} // anonymous namespace
ChannelWrap::ChannelWrap(
Environment* env,
Local<Object> object,
int timeout,
int tries)
: AsyncWrap(env, object, PROVIDER_DNSCHANNEL),
timeout_(timeout),
tries_(tries) {
MakeWeak();
Setup();
}
void ChannelWrap::MemoryInfo(MemoryTracker* tracker) const {
if (timer_handle_ != nullptr)
tracker->TrackField("timer_handle", *timer_handle_);
tracker->TrackField("task_list", task_list_, "NodeAresTask::List");
}
void ChannelWrap::New(const FunctionCallbackInfo<Value>& args) {
CHECK(args.IsConstructCall());
CHECK_EQ(args.Length(), 2);
CHECK(args[0]->IsInt32());
CHECK(args[1]->IsInt32());
const int timeout = args[0].As<Int32>()->Value();
const int tries = args[1].As<Int32>()->Value();
Environment* env = Environment::GetCurrent(args);
new ChannelWrap(env, args.This(), timeout, tries);
}
GetAddrInfoReqWrap::GetAddrInfoReqWrap(Environment* env,
Local<Object> req_wrap_obj,
uint8_t order)
: ReqWrap(env, req_wrap_obj, AsyncWrap::PROVIDER_GETADDRINFOREQWRAP),
order_(order) {}
GetNameInfoReqWrap::GetNameInfoReqWrap(
Environment* env,
Local<Object> req_wrap_obj)
: ReqWrap(env, req_wrap_obj, AsyncWrap::PROVIDER_GETNAMEINFOREQWRAP) {}
/* This is called once per second by loop->timer. It is used to constantly */
/* call back into c-ares for possibly processing timeouts. */
void ChannelWrap::AresTimeout(uv_timer_t* handle) {
ChannelWrap* channel = static_cast<ChannelWrap*>(handle->data);
CHECK_EQ(channel->timer_handle(), handle);
ares_process_fd(channel->cares_channel(), ARES_SOCKET_BAD, ARES_SOCKET_BAD);
}
void NodeAresTask::MemoryInfo(MemoryTracker* tracker) const {
tracker->TrackField("channel", channel);
}
/* Allocates and returns a new NodeAresTask */
NodeAresTask* NodeAresTask::Create(ChannelWrap* channel, ares_socket_t sock) {
auto task = new NodeAresTask();
task->channel = channel;
task->sock = sock;
if (uv_poll_init_socket(channel->env()->event_loop(),
&task->poll_watcher, sock) < 0) {
/* This should never happen. */
delete task;
return nullptr;
}
return task;
}
void ChannelWrap::Setup() {
struct ares_options options;
memset(&options, 0, sizeof(options));
options.flags = ARES_FLAG_NOCHECKRESP;
options.sock_state_cb = ares_sockstate_cb;
options.sock_state_cb_data = this;
options.timeout = timeout_;
options.tries = tries_;
int r;
if (!library_inited_) {
Mutex::ScopedLock lock(ares_library_mutex);
// Multiple calls to ares_library_init() increase a reference counter,
// so this is a no-op except for the first call to it.
r = ares_library_init(ARES_LIB_INIT_ALL);
if (r != ARES_SUCCESS)
return env()->ThrowError(ToErrorCodeString(r));
}
/* We do the call to ares_init_option for caller. */
const int optmask =
ARES_OPT_FLAGS | ARES_OPT_TIMEOUTMS |
ARES_OPT_SOCK_STATE_CB | ARES_OPT_TRIES;
r = ares_init_options(&channel_, &options, optmask);
if (r != ARES_SUCCESS) {
Mutex::ScopedLock lock(ares_library_mutex);
ares_library_cleanup();
return env()->ThrowError(ToErrorCodeString(r));
}
library_inited_ = true;
}
void ChannelWrap::StartTimer() {
if (timer_handle_ == nullptr) {
timer_handle_ = new uv_timer_t();
timer_handle_->data = static_cast<void*>(this);
uv_timer_init(env()->event_loop(), timer_handle_);
} else if (uv_is_active(reinterpret_cast<uv_handle_t*>(timer_handle_))) {
return;
}
int timeout = timeout_;
if (timeout == 0) timeout = 1;
if (timeout < 0 || timeout > 1000) timeout = 1000;
uv_timer_start(timer_handle_, AresTimeout, timeout, timeout);
}
void ChannelWrap::CloseTimer() {
if (timer_handle_ == nullptr)
return;
env()->CloseHandle(timer_handle_, [](uv_timer_t* handle) { delete handle; });
timer_handle_ = nullptr;
}
ChannelWrap::~ChannelWrap() {
ares_destroy(channel_);
if (library_inited_) {
Mutex::ScopedLock lock(ares_library_mutex);
// This decreases the reference counter increased by ares_library_init().
ares_library_cleanup();
}
CloseTimer();
}
void ChannelWrap::ModifyActivityQueryCount(int count) {
active_query_count_ += count;
CHECK_GE(active_query_count_, 0);
}
/**
* This function is to check whether current servers are fallback servers
* when cares initialized.
*
* The fallback servers of cares is [ "127.0.0.1" ] with no user additional
* setting.
*/
void ChannelWrap::EnsureServers() {
/* if last query is OK or servers are set by user self, do not check */
if (query_last_ok_ || !is_servers_default_) {
return;
}
ares_addr_port_node* servers = nullptr;
ares_get_servers_ports(channel_, &servers);
/* if no server or multi-servers, ignore */
if (servers == nullptr) return;
if (servers->next != nullptr) {
ares_free_data(servers);
is_servers_default_ = false;
return;
}
/* if the only server is not 127.0.0.1, ignore */
if (servers[0].family != AF_INET ||
servers[0].addr.addr4.s_addr != htonl(INADDR_LOOPBACK) ||
servers[0].tcp_port != 0 ||
servers[0].udp_port != 0) {
ares_free_data(servers);
is_servers_default_ = false;
return;
}
ares_free_data(servers);
servers = nullptr;
/* destroy channel and reset channel */
ares_destroy(channel_);
CloseTimer();
Setup();
}
int AnyTraits::Send(QueryWrap<AnyTraits>* wrap, const char* name) {
wrap->AresQuery(name, ARES_CLASS_IN, ARES_REC_TYPE_ANY);
return ARES_SUCCESS;
}
int ATraits::Send(QueryWrap<ATraits>* wrap, const char* name) {
wrap->AresQuery(name, ARES_CLASS_IN, ARES_REC_TYPE_A);
return ARES_SUCCESS;
}
int AaaaTraits::Send(QueryWrap<AaaaTraits>* wrap, const char* name) {
wrap->AresQuery(name, ARES_CLASS_IN, ARES_REC_TYPE_AAAA);
return ARES_SUCCESS;
}
int CaaTraits::Send(QueryWrap<CaaTraits>* wrap, const char* name) {
wrap->AresQuery(name, ARES_CLASS_IN, ARES_REC_TYPE_CAA);
return ARES_SUCCESS;
}
int CnameTraits::Send(QueryWrap<CnameTraits>* wrap, const char* name) {
wrap->AresQuery(name, ARES_CLASS_IN, ARES_REC_TYPE_CNAME);
return ARES_SUCCESS;
}
int MxTraits::Send(QueryWrap<MxTraits>* wrap, const char* name) {
wrap->AresQuery(name, ARES_CLASS_IN, ARES_REC_TYPE_MX);
return ARES_SUCCESS;
}
int NsTraits::Send(QueryWrap<NsTraits>* wrap, const char* name) {
wrap->AresQuery(name, ARES_CLASS_IN, ARES_REC_TYPE_NS);
return ARES_SUCCESS;
}
int TxtTraits::Send(QueryWrap<TxtTraits>* wrap, const char* name) {
wrap->AresQuery(name, ARES_CLASS_IN, ARES_REC_TYPE_TXT);
return ARES_SUCCESS;
}
int SrvTraits::Send(QueryWrap<SrvTraits>* wrap, const char* name) {
wrap->AresQuery(name, ARES_CLASS_IN, ARES_REC_TYPE_SRV);
return ARES_SUCCESS;
}
int PtrTraits::Send(QueryWrap<PtrTraits>* wrap, const char* name) {
wrap->AresQuery(name, ARES_CLASS_IN, ARES_REC_TYPE_PTR);
return ARES_SUCCESS;
}
int NaptrTraits::Send(QueryWrap<NaptrTraits>* wrap, const char* name) {
wrap->AresQuery(name, ARES_CLASS_IN, ARES_REC_TYPE_NAPTR);
return ARES_SUCCESS;
}
int SoaTraits::Send(QueryWrap<SoaTraits>* wrap, const char* name) {
wrap->AresQuery(name, ARES_CLASS_IN, ARES_REC_TYPE_SOA);
return ARES_SUCCESS;
}
int AnyTraits::Parse(
QueryAnyWrap* wrap,
const std::unique_ptr<ResponseData>& response) {
if (response->is_host) [[unlikely]] {
return ARES_EBADRESP;
}
unsigned char* buf = response->buf.data;
int len = response->buf.size;
Environment* env = wrap->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
Local<Array> ret = Array::New(env->isolate());
int type, status, old_count;
/* Parse A records or CNAME records */
ares_addrttl addrttls[256];
int naddrttls = arraysize(addrttls);
type = ns_t_cname_or_a;
status = ParseGeneralReply(env,
buf,
len,
&type,
ret,
addrttls,
&naddrttls);
uint32_t a_count = ret->Length();
if (status != ARES_SUCCESS && status != ARES_ENODATA)
return status;
if (type == ns_t_a) {
CHECK_EQ(static_cast<uint32_t>(naddrttls), a_count);
for (uint32_t i = 0; i < a_count; i++) {
Local<Object> obj = Object::New(env->isolate());
obj->Set(env->context(),
env->address_string(),
ret->Get(env->context(), i).ToLocalChecked()).Check();
obj->Set(env->context(),
env->ttl_string(),
Integer::NewFromUnsigned(
env->isolate(), addrttls[i].ttl)).Check();
obj->Set(env->context(),
env->type_string(),
env->dns_a_string()).Check();
ret->Set(env->context(), i, obj).Check();
}
} else {
for (uint32_t i = 0; i < a_count; i++) {
Local<Object> obj = Object::New(env->isolate());
obj->Set(env->context(),
env->value_string(),
ret->Get(env->context(), i).ToLocalChecked()).Check();
obj->Set(env->context(),
env->type_string(),
env->dns_cname_string()).Check();
ret->Set(env->context(), i, obj).Check();
}
}
/* Parse AAAA records */
ares_addr6ttl addr6ttls[256];
int naddr6ttls = arraysize(addr6ttls);
type = ns_t_aaaa;
status = ParseGeneralReply(env,
buf,
len,
&type,
ret,
addr6ttls,
&naddr6ttls);
uint32_t aaaa_count = ret->Length() - a_count;
if (status != ARES_SUCCESS && status != ARES_ENODATA)
return status;
CHECK_EQ(aaaa_count, static_cast<uint32_t>(naddr6ttls));
CHECK_EQ(ret->Length(), a_count + aaaa_count);
for (uint32_t i = a_count; i < ret->Length(); i++) {
Local<Object> obj = Object::New(env->isolate());
obj->Set(env->context(),
env->address_string(),
ret->Get(env->context(), i).ToLocalChecked()).Check();
obj->Set(env->context(),
env->ttl_string(),
Integer::NewFromUnsigned(
env->isolate(), addr6ttls[i - a_count].ttl)).Check();
obj->Set(env->context(),
env->type_string(),
env->dns_aaaa_string()).Check();
ret->Set(env->context(), i, obj).Check();
}
/* Parse MX records */
status = ParseMxReply(env, buf, len, ret, true);
if (status != ARES_SUCCESS && status != ARES_ENODATA)
return status;
/* Parse NS records */
type = ns_t_ns;
old_count = ret->Length();
status = ParseGeneralReply(env, buf, len, &type, ret);
if (status != ARES_SUCCESS && status != ARES_ENODATA)
return status;
for (uint32_t i = old_count; i < ret->Length(); i++) {
Local<Object> obj = Object::New(env->isolate());
obj->Set(env->context(),
env->value_string(),
ret->Get(env->context(), i).ToLocalChecked()).Check();
obj->Set(env->context(),
env->type_string(),