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2502 lines (2103 loc) · 77.4 KB
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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 <cstdlib>
#include <cstring>
#include <memory>
#include <string>
#include <string_view>
#include <unordered_set>
#include <utility>
#include <vector>
#ifndef T_TLSA
#define T_TLSA 52 /* TLSA certificate association */
#endif
#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::ArrayBuffer;
using v8::Context;
using v8::DictionaryTemplate;
using v8::EscapableHandleScope;
using v8::Exception;
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::LocalVector;
using v8::Maybe;
using v8::MaybeLocal;
using v8::Nothing;
using v8::Null;
using v8::Object;
using v8::String;
using v8::Uint32;
using v8::Undefined;
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();
}
}
}
MaybeLocal<Array> HostentToNames(Environment* env, struct hostent* host) {
EscapableHandleScope scope(env->isolate());
LocalVector<Value> names(env->isolate());
for (uint32_t i = 0; host->h_aliases[i] != nullptr; ++i) {
names.emplace_back(OneByteString(env->isolate(), host->h_aliases[i]));
}
return scope.Escape(Array::New(env->isolate(), names.data(), names.size()));
}
template <typename T>
Local<Array> AddrTTLToArray(
Environment* env,
const T* addrttls,
size_t naddrttls) {
MaybeStackBuffer<Value, 8> ttls(env->isolate(), naddrttls);
for (size_t i = 0; i < naddrttls; i++) {
ttls[i] = Integer::NewFromUnsigned(env->isolate(), addrttls[i].ttl);
}
return ttls.ToArray();
}
// Parse the CSV produced by ares_get_servers_csv() back into (ip, port)
// pairs. Each entry is "ipv4:port" or "[ipv6]:port"; entries whose UDP and
// TCP ports differ are emitted in the "dns://host:port?tcpport=..." URI form.
// A trailing "%interface" is ignored.
std::vector<std::pair<std::string, int>> ParseServersCsv(const char* csv) {
std::vector<std::pair<std::string, int>> servers;
if (csv == nullptr) return servers;
std::string_view all(csv);
size_t pos = 0;
while (pos <= all.size()) {
size_t comma = all.find(',', pos);
std::string_view entry = all.substr(
pos,
comma == std::string_view::npos ? std::string_view::npos : comma - pos);
pos = comma == std::string_view::npos ? all.size() + 1 : comma + 1;
// Drop a URI scheme prefix (only present when udp/tcp ports differ),
// a URI query string, and/or a trailing interface name.
size_t scheme = entry.find("://");
if (scheme != std::string_view::npos) entry = entry.substr(scheme + 3);
size_t query = entry.find('?');
if (query != std::string_view::npos) entry = entry.substr(0, query);
size_t iface = entry.find('%');
if (iface != std::string_view::npos) entry = entry.substr(0, iface);
if (entry.empty()) continue;
std::string host;
int port = 53;
std::string_view port_str;
if (entry.front() == '[') {
size_t close = entry.find(']');
if (close == std::string_view::npos) continue;
host = std::string(entry.substr(1, close - 1));
size_t colon = entry.find(':', close);
if (colon != std::string_view::npos) port_str = entry.substr(colon + 1);
} else {
size_t colon = entry.rfind(':');
if (colon != std::string_view::npos) {
host = std::string(entry.substr(0, colon));
port_str = entry.substr(colon + 1);
} else {
host = std::string(entry);
}
}
if (!port_str.empty()) {
std::string s(port_str);
port = static_cast<int>(strtol(s.c_str(), nullptr, 10));
}
servers.emplace_back(std::move(host), port);
}
return servers;
}
int GetAnswerCountForTTLBuffer(const unsigned char* buf, int len) {
static constexpr int kDNSAnswerCountOffset = 6;
static constexpr int kAresDefaultTTLBufferLength = 256;
if (len <= kDNSAnswerCountOffset + 1) {
return kAresDefaultTTLBufferLength;
}
const int answer_count = (static_cast<int>(buf[kDNSAnswerCountOffset]) << 8) |
static_cast<int>(buf[kDNSAnswerCountOffset + 1]);
return answer_count == 0 ? 1 : answer_count;
}
template <typename T>
std::vector<T> MakeAddrTTLBuffer(const unsigned char* buf, int len) {
return std::vector<T>(GetAnswerCountForTTLBuffer(buf, len));
}
Maybe<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());
ares_dns_record_t* dnsrec = nullptr;
int status = ares_dns_parse(buf, len, 0, &dnsrec);
if (status != ARES_SUCCESS) {
ares_dns_record_destroy(dnsrec);
return Just<int>(status);
}
DeleteFnPtr<ares_dns_record_t, ares_dns_record_destroy> free_me(dnsrec);
const size_t rr_count = ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER);
/* If it's `CNAME_OR_A`, a response that carries a CNAME record is reported
* as a CNAME; otherwise it is reported as an A record. */
if (*type == ns_t_cname_or_a) {
bool has_cname = false;
for (size_t i = 0; i < rr_count; i++) {
const ares_dns_rr_t* rr =
ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
if (ares_dns_rr_get_type(rr) == ARES_REC_TYPE_CNAME) {
has_cname = true;
break;
}
}
*type = has_cname ? ns_t_cname : ns_t_a;
}
const uint32_t offset = ret->Length();
uint32_t count = 0;
auto append_name = [&](ares_dns_rec_type_t rec_type,
ares_dns_rr_key_t key) -> Maybe<bool> {
for (size_t i = 0; i < rr_count; i++) {
const ares_dns_rr_t* rr =
ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
if (ares_dns_rr_get_type(rr) != rec_type) continue;
const char* name = ares_dns_rr_get_str(rr, key);
if (name == nullptr) continue;
if (ret->Set(env->context(),
offset + count++,
OneByteString(env->isolate(), name))
.IsNothing()) {
return Nothing<bool>();
}
}
return Just(true);
};
switch (*type) {
case ns_t_cname:
// A cname lookup always returns a single record in practice but we
// follow the common API here and return every CNAME target.
if (append_name(ARES_REC_TYPE_CNAME, ARES_RR_CNAME_CNAME).IsNothing()) {
return Nothing<int>();
}
break;
case ns_t_ns:
if (append_name(ARES_REC_TYPE_NS, ARES_RR_NS_NSDNAME).IsNothing()) {
return Nothing<int>();
}
break;
case ns_t_ptr:
if (append_name(ARES_REC_TYPE_PTR, ARES_RR_PTR_DNAME).IsNothing()) {
return Nothing<int>();
}
break;
case ns_t_a: {
auto* ttls = static_cast<ares_addrttl*>(addrttls);
const int max = naddrttls != nullptr ? *naddrttls : 0;
char ip[INET6_ADDRSTRLEN];
for (size_t i = 0; i < rr_count; i++) {
const ares_dns_rr_t* rr =
ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
if (ares_dns_rr_get_type(rr) != ARES_REC_TYPE_A) continue;
if (ttls != nullptr && static_cast<int>(count) >= max) break;
const struct in_addr* addr = ares_dns_rr_get_addr(rr, ARES_RR_A_ADDR);
if (addr == nullptr) continue;
uv_inet_ntop(AF_INET, addr, ip, sizeof(ip));
if (ttls != nullptr) {
ttls[count].ipaddr = *addr;
ttls[count].ttl = ares_dns_rr_get_ttl(rr);
}
if (ret->Set(env->context(),
offset + count++,
OneByteString(env->isolate(), ip))
.IsNothing()) {
return Nothing<int>();
}
}
if (naddrttls != nullptr) *naddrttls = count;
break;
}
case ns_t_aaaa: {
auto* ttls = static_cast<ares_addr6ttl*>(addrttls);
const int max = naddrttls != nullptr ? *naddrttls : 0;
char ip[INET6_ADDRSTRLEN];
for (size_t i = 0; i < rr_count; i++) {
const ares_dns_rr_t* rr =
ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
if (ares_dns_rr_get_type(rr) != ARES_REC_TYPE_AAAA) continue;
if (ttls != nullptr && static_cast<int>(count) >= max) break;
const struct ares_in6_addr* addr =
ares_dns_rr_get_addr6(rr, ARES_RR_AAAA_ADDR);
if (addr == nullptr) continue;
uv_inet_ntop(AF_INET6, addr, ip, sizeof(ip));
if (ttls != nullptr) {
ttls[count].ip6addr = *addr;
ttls[count].ttl = ares_dns_rr_get_ttl(rr);
}
if (ret->Set(env->context(),
offset + count++,
OneByteString(env->isolate(), ip))
.IsNothing()) {
return Nothing<int>();
}
}
if (naddrttls != nullptr) *naddrttls = count;
break;
}
default:
UNREACHABLE("Bad NS type");
}
// Preserve the behavior of the previous ares_parse_*_reply() helpers, which
// reported an empty answer section as ARES_ENODATA.
if (count == 0) return Just<int>(ARES_ENODATA);
return Just<int>(ARES_SUCCESS);
}
Maybe<int> ParseMxReply(Environment* env,
const unsigned char* buf,
int len,
Local<Array> ret,
bool need_type = false) {
HandleScope handle_scope(env->isolate());
auto tmpl = env->mx_record_template();
if (tmpl.IsEmpty()) {
static constexpr std::string_view names[] = {
"exchange",
"priority",
"type",
};
tmpl = DictionaryTemplate::New(env->isolate(), names);
env->set_mx_record_template(tmpl);
}
ares_dns_record_t* dnsrec = nullptr;
int status = ares_dns_parse(buf, len, 0, &dnsrec);
if (status != ARES_SUCCESS) {
ares_dns_record_destroy(dnsrec);
return Just<int>(status);
}
DeleteFnPtr<ares_dns_record_t, ares_dns_record_destroy> free_me(dnsrec);
const size_t rr_count = ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER);
uint32_t offset = ret->Length();
uint32_t count = 0;
MaybeLocal<Value> values[] = {
Undefined(env->isolate()), // exchange
Undefined(env->isolate()), // priority
Undefined(env->isolate()), // type
};
for (size_t i = 0; i < rr_count; i++) {
const ares_dns_rr_t* rr =
ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
if (ares_dns_rr_get_type(rr) != ARES_REC_TYPE_MX) continue;
const char* exchange = ares_dns_rr_get_str(rr, ARES_RR_MX_EXCHANGE);
unsigned short priority = // NOLINT(runtime/int)
ares_dns_rr_get_u16(rr, ARES_RR_MX_PREFERENCE);
values[0] = OneByteString(env->isolate(), exchange);
values[1] = Integer::New(env->isolate(), priority);
values[2] = env->dns_mx_string();
Local<Value> record;
if (!NewDictionaryInstance(env->context(), tmpl, values).ToLocal(&record) ||
ret->Set(env->context(), offset + count++, record).IsNothing()) {
return Nothing<int>();
}
}
if (count == 0) return Just<int>(ARES_ENODATA);
return Just<int>(ARES_SUCCESS);
}
Maybe<int> ParseCaaReply(Environment* env,
const unsigned char* buf,
int len,
Local<Array> ret,
bool need_type = false) {
HandleScope handle_scope(env->isolate());
auto tmpl = env->caa_record_template();
if (tmpl.IsEmpty()) {
static constexpr std::string_view names[] = {
"critical",
"type",
};
tmpl = DictionaryTemplate::New(env->isolate(), names);
env->set_caa_record_template(tmpl);
}
ares_dns_record_t* dnsrec = nullptr;
int status = ares_dns_parse(buf, len, 0, &dnsrec);
if (status != ARES_SUCCESS) {
ares_dns_record_destroy(dnsrec);
return Just<int>(status);
}
DeleteFnPtr<ares_dns_record_t, ares_dns_record_destroy> free_me(dnsrec);
MaybeLocal<Value> values[] = {
Undefined(env->isolate()), // critical
Undefined(env->isolate()), // type
};
const size_t rr_count = ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER);
uint32_t offset = ret->Length();
uint32_t count = 0;
for (size_t i = 0; i < rr_count; i++) {
const ares_dns_rr_t* rr =
ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
if (ares_dns_rr_get_type(rr) != ARES_REC_TYPE_CAA) continue;
unsigned char critical = ares_dns_rr_get_u8(rr, ARES_RR_CAA_CRITICAL);
values[0] = Integer::New(env->isolate(), critical);
values[1] = env->dns_caa_string();
Local<Object> caa_record;
if (!NewDictionaryInstance(env->context(), tmpl, values)
.ToLocal(&caa_record)) {
return Nothing<int>();
}
const char* tag = ares_dns_rr_get_str(rr, ARES_RR_CAA_TAG);
size_t value_len = 0;
const unsigned char* value =
ares_dns_rr_get_bin(rr, ARES_RR_CAA_VALUE, &value_len);
// This additional property is not part of the template as it is
// variable based on the record.
if (caa_record
->Set(env->context(),
OneByteString(env->isolate(), tag),
OneByteString(env->isolate(), value, value_len))
.IsNothing()) {
return Nothing<int>();
}
if (ret->Set(env->context(), offset + count++, caa_record).IsNothing()) {
return Nothing<int>();
}
}
if (count == 0) return Just<int>(ARES_ENODATA);
return Just<int>(ARES_SUCCESS);
}
Maybe<int> ParseTlsaReply(Environment* env,
unsigned char* buf,
int len,
Local<Array> ret) {
EscapableHandleScope handle_scope(env->isolate());
auto tmpl = env->tlsa_record_template();
if (tmpl.IsEmpty()) {
static constexpr std::string_view names[] = {
"certUsage",
"selector",
"match",
"data",
};
tmpl = DictionaryTemplate::New(env->isolate(), names);
env->set_tlsa_record_template(tmpl);
}
ares_dns_record_t* dnsrec = nullptr;
int status = ares_dns_parse(buf, len, 0, &dnsrec);
if (status != ARES_SUCCESS) {
ares_dns_record_destroy(dnsrec);
return Just<int>(status);
}
DeleteFnPtr<ares_dns_record_t, ares_dns_record_destroy> free_me(dnsrec);
uint32_t offset = ret->Length();
size_t rr_count = ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER);
MaybeLocal<Value> values[] = {
Undefined(env->isolate()), // certUsage
Undefined(env->isolate()), // selector
Undefined(env->isolate()), // match
Undefined(env->isolate()), // data
};
for (size_t i = 0; i < rr_count; i++) {
const ares_dns_rr_t* rr =
ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
if (ares_dns_rr_get_type(rr) != ARES_REC_TYPE_TLSA) continue;
unsigned char certusage = ares_dns_rr_get_u8(rr, ARES_RR_TLSA_CERT_USAGE);
unsigned char selector = ares_dns_rr_get_u8(rr, ARES_RR_TLSA_SELECTOR);
unsigned char match = ares_dns_rr_get_u8(rr, ARES_RR_TLSA_MATCH);
size_t data_len;
const unsigned char* data =
ares_dns_rr_get_bin(rr, ARES_RR_TLSA_DATA, &data_len);
if (!data || data_len == 0) continue;
Local<ArrayBuffer> data_ab = ArrayBuffer::New(env->isolate(), data_len);
memcpy(data_ab->Data(), data, data_len);
values[0] = Integer::NewFromUnsigned(env->isolate(), certusage);
values[1] = Integer::NewFromUnsigned(env->isolate(), selector);
values[2] = Integer::NewFromUnsigned(env->isolate(), match);
values[3] = data_ab;
Local<Object> tlsa_rec;
if (!NewDictionaryInstance(env->context(), tmpl, values)
.ToLocal(&tlsa_rec) ||
ret->Set(env->context(), offset + i, tlsa_rec).IsNothing()) {
return Nothing<int>();
}
}
return Just<int>(ARES_SUCCESS);
}
Maybe<int> ParseTxtReply(Environment* env,
const unsigned char* buf,
int len,
Local<Array> ret,
bool need_type = false) {
HandleScope handle_scope(env->isolate());
auto tmpl = env->txt_record_template();
if (tmpl.IsEmpty()) {
static constexpr std::string_view names[] = {
"entries",
"type",
};
tmpl = DictionaryTemplate::New(env->isolate(), names);
env->set_txt_record_template(tmpl);
}
ares_dns_record_t* dnsrec = nullptr;
int status = ares_dns_parse(buf, len, 0, &dnsrec);
if (status != ARES_SUCCESS) {
ares_dns_record_destroy(dnsrec);
return Just<int>(status);
}
DeleteFnPtr<ares_dns_record_t, ares_dns_record_destroy> free_me(dnsrec);
const size_t rr_count = ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER);
uint32_t offset = ret->Length();
uint32_t count = 0;
MaybeLocal<Value> values[] = {
Undefined(env->isolate()), // entries
Undefined(env->isolate()), // type
};
for (size_t i = 0; i < rr_count; i++) {
const ares_dns_rr_t* rr =
ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
if (ares_dns_rr_get_type(rr) != ARES_REC_TYPE_TXT) continue;
// Each TXT record is a chunk consisting of one or more character-strings.
LocalVector<Value> chunks(env->isolate());
size_t str_count = ares_dns_rr_get_abin_cnt(rr, ARES_RR_TXT_DATA);
chunks.reserve(str_count);
for (size_t j = 0; j < str_count; j++) {
size_t str_len = 0;
const unsigned char* str =
ares_dns_rr_get_abin(rr, ARES_RR_TXT_DATA, j, &str_len);
chunks.push_back(OneByteString(env->isolate(), str, str_len));
}
Local<Array> txt_chunk =
Array::New(env->isolate(), chunks.data(), chunks.size());
if (need_type) {
values[0] = txt_chunk;
values[1] = env->dns_txt_string();
Local<Object> elem;
if (!NewDictionaryInstance(env->context(), tmpl, values).ToLocal(&elem) ||
ret->Set(env->context(), offset + count++, elem).IsNothing()) {
return Nothing<int>();
}
} else if (ret->Set(env->context(), offset + count++, txt_chunk)
.IsNothing()) {
return Nothing<int>();
}
}
if (count == 0) return Just<int>(ARES_ENODATA);
return Just<int>(ARES_SUCCESS);
}
Maybe<int> ParseSrvReply(Environment* env,
const unsigned char* buf,
int len,
Local<Array> ret,
bool need_type = false) {
HandleScope handle_scope(env->isolate());
auto tmpl = env->srv_record_template();
if (tmpl.IsEmpty()) {
static constexpr std::string_view names[] = {
"name",
"port",
"priority",
"weight",
"type",
};
tmpl = DictionaryTemplate::New(env->isolate(), names);
env->set_srv_record_template(tmpl);
}
ares_dns_record_t* dnsrec = nullptr;
int status = ares_dns_parse(buf, len, 0, &dnsrec);
if (status != ARES_SUCCESS) {
ares_dns_record_destroy(dnsrec);
return Just<int>(status);
}
DeleteFnPtr<ares_dns_record_t, ares_dns_record_destroy> free_me(dnsrec);
MaybeLocal<Value> values[] = {
Undefined(env->isolate()), // name
Undefined(env->isolate()), // port
Undefined(env->isolate()), // priority
Undefined(env->isolate()), // weight
Undefined(env->isolate()), // type
};
const size_t rr_count = ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER);
uint32_t offset = ret->Length();
uint32_t count = 0;
for (size_t i = 0; i < rr_count; i++) {
const ares_dns_rr_t* rr =
ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
if (ares_dns_rr_get_type(rr) != ARES_REC_TYPE_SRV) continue;
const char* target = ares_dns_rr_get_str(rr, ARES_RR_SRV_TARGET);
values[0] = OneByteString(env->isolate(), target);
values[1] =
Integer::New(env->isolate(), ares_dns_rr_get_u16(rr, ARES_RR_SRV_PORT));
values[2] = Integer::New(env->isolate(),
ares_dns_rr_get_u16(rr, ARES_RR_SRV_PRIORITY));
values[3] = Integer::New(env->isolate(),
ares_dns_rr_get_u16(rr, ARES_RR_SRV_WEIGHT));
values[4] = env->dns_srv_string();
Local<Object> srv_record;
if (!NewDictionaryInstance(env->context(), tmpl, values)
.ToLocal(&srv_record) ||
ret->Set(env->context(), offset + count++, srv_record).IsNothing()) {
return Nothing<int>();
}
}
if (count == 0) return Just<int>(ARES_ENODATA);
return Just<int>(ARES_SUCCESS);
}
Maybe<int> ParseNaptrReply(Environment* env,
const unsigned char* buf,
int len,
Local<Array> ret,
bool need_type = false) {
HandleScope handle_scope(env->isolate());
auto tmpl = env->naptr_record_template();
if (tmpl.IsEmpty()) {
static constexpr std::string_view names[] = {
"flags",
"service",
"regexp",
"replacement",
"order",
"preference",
"type",
};
tmpl = DictionaryTemplate::New(env->isolate(), names);
env->set_naptr_record_template(tmpl);
}
ares_dns_record_t* dnsrec = nullptr;
int status = ares_dns_parse(buf, len, 0, &dnsrec);
if (status != ARES_SUCCESS) {
ares_dns_record_destroy(dnsrec);
return Just<int>(status);
}
DeleteFnPtr<ares_dns_record_t, ares_dns_record_destroy> free_me(dnsrec);
MaybeLocal<Value> values[] = {
Undefined(env->isolate()), // flags
Undefined(env->isolate()), // service
Undefined(env->isolate()), // regexp
Undefined(env->isolate()), // replacement
Undefined(env->isolate()), // order
Undefined(env->isolate()), // preference
Undefined(env->isolate()), // type
};
const size_t rr_count = ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER);
uint32_t offset = ret->Length();
uint32_t count = 0;
for (size_t i = 0; i < rr_count; i++) {
const ares_dns_rr_t* rr =
ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
if (ares_dns_rr_get_type(rr) != ARES_REC_TYPE_NAPTR) continue;
values[0] = OneByteString(env->isolate(),
ares_dns_rr_get_str(rr, ARES_RR_NAPTR_FLAGS));
values[1] = OneByteString(env->isolate(),
ares_dns_rr_get_str(rr, ARES_RR_NAPTR_SERVICES));
values[2] = OneByteString(env->isolate(),
ares_dns_rr_get_str(rr, ARES_RR_NAPTR_REGEXP));
values[3] = OneByteString(
env->isolate(), ares_dns_rr_get_str(rr, ARES_RR_NAPTR_REPLACEMENT));
values[4] = Integer::New(env->isolate(),
ares_dns_rr_get_u16(rr, ARES_RR_NAPTR_ORDER));
values[5] = Integer::New(env->isolate(),
ares_dns_rr_get_u16(rr, ARES_RR_NAPTR_PREFERENCE));
if (need_type) {
values[6] = env->dns_naptr_string();
}
Local<Object> naptr_record;
if (!NewDictionaryInstance(env->context(), tmpl, values)
.ToLocal(&naptr_record) ||
ret->Set(env->context(), offset + count++, naptr_record).IsNothing()) {
return Nothing<int>();
}
}
if (count == 0) return Just<int>(ARES_ENODATA);
return Just<int>(ARES_SUCCESS);
}
Local<DictionaryTemplate> getSoaRecordTemplate(Environment* env) {
auto tmpl = env->soa_record_template();
if (tmpl.IsEmpty()) {
static constexpr std::string_view names[] = {
"nsname",
"hostmaster",
"serial",
"refresh",
"retry",
"expire",
"minttl",
"type",
};
tmpl = DictionaryTemplate::New(env->isolate(), names);
env->set_soa_record_template(tmpl);
}
return tmpl;
}
Maybe<int> ParseSoaReply(Environment* env,
unsigned char* buf,
int len,
Local<Object>* ret) {
EscapableHandleScope handle_scope(env->isolate());
auto tmpl = getSoaRecordTemplate(env);
// 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 Just<int>(status == ARES_EBADNAME ? ARES_EBADRESP : status);
}
const ares_unique_ptr name(name_temp);
if (ptr + temp_len + NS_QFIXEDSZ > buf + len) {
return Just<int>(ARES_EBADRESP);
}
ptr += temp_len + NS_QFIXEDSZ;
MaybeLocal<Value> values[] = {
Undefined(env->isolate()), // nsname
Undefined(env->isolate()), // hostmaster
Undefined(env->isolate()), // serial
Undefined(env->isolate()), // refresh
Undefined(env->isolate()), // retry
Undefined(env->isolate()), // expire
Undefined(env->isolate()), // minttl
Undefined(env->isolate()), // type
};
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 Just<int>(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 Just<int>(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 Just<int>(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 Just<int>(status4 == ARES_EBADNAME ? ARES_EBADRESP : status4);
}
const ares_unique_ptr hostmaster(hostmaster_temp);
ptr += hostmaster_temp_len;
if (ptr + 5 * 4 > buf + len) {
return Just<int>(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);
values[0] = OneByteString(env->isolate(), nsname.get());
values[1] = OneByteString(env->isolate(), hostmaster.get());
values[2] = Integer::NewFromUnsigned(env->isolate(), serial);
values[3] = Integer::New(env->isolate(), refresh);
values[4] = Integer::New(env->isolate(), retry);
values[5] = Integer::New(env->isolate(), expire);
values[6] = Integer::NewFromUnsigned(env->isolate(), minttl);
values[7] = env->dns_soa_string();
Local<Object> soa_record;
if (!NewDictionaryInstance(env->context(), tmpl, values)
.ToLocal(&soa_record)) {
return Nothing<int>();
}
*ret = handle_scope.Escape(soa_record);
break;
}
ptr += rr_len;
}
return Just<int>(ARES_SUCCESS);
}
} // anonymous namespace
ChannelWrap::ChannelWrap(Environment* env,
Local<Object> object,
int timeout,
int tries,
int max_timeout)
: AsyncWrap(env, object, PROVIDER_DNSCHANNEL),
timeout_(timeout),
tries_(tries),
max_timeout_(max_timeout) {
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(), 3);
CHECK(args[0]->IsInt32());
CHECK(args[1]->IsInt32());
CHECK(args[2]->IsInt32());
const int timeout = args[0].As<Int32>()->Value();
const int tries = args[1].As<Int32>()->Value();
const int max_timeout = args[2].As<Int32>()->Value();
Environment* env = Environment::GetCurrent(args);
new ChannelWrap(env, args.This(), timeout, tries, max_timeout);
}
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) {}
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