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2225 lines (1810 loc) · 64.1 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.
#define CARES_STATICLIB
#include "ares.h"
#include "async-wrap.h"
#include "async-wrap-inl.h"
#include "env.h"
#include "env-inl.h"
#include "node.h"
#include "req-wrap.h"
#include "req-wrap-inl.h"
#include "util.h"
#include "util-inl.h"
#include "uv.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <vector>
#include <unordered_set>
#if defined(__ANDROID__) || \
defined(__MINGW32__) || \
defined(__OpenBSD__) || \
defined(_MSC_VER)
# include <nameser.h>
#else
# include <arpa/nameser.h>
#endif
#if defined(__OpenBSD__)
# 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::Integer;
using v8::Local;
using v8::Null;
using v8::Object;
using v8::String;
using v8::Value;
namespace {
inline uint16_t cares_get_16bit(const unsigned char* p) {
return static_cast<uint32_t>(p[0] << 8U) | (static_cast<uint32_t>(p[1]));
}
inline uint32_t cares_get_32bit(const unsigned char* p) {
return static_cast<uint32_t>(p[0] << 24U) |
static_cast<uint32_t>(p[1] << 16U) |
static_cast<uint32_t>(p[2] << 8U) |
static_cast<uint32_t>(p[3]);
}
const int ns_t_cname_or_a = -1;
inline const char* ToErrorCodeString(int status) {
switch (status) {
#define V(code) case ARES_##code: return #code;
V(EADDRGETNETWORKPARAMS)
V(EBADFAMILY)
V(EBADFLAGS)
V(EBADHINTS)
V(EBADNAME)
V(EBADQUERY)
V(EBADRESP)
V(EBADSTR)
V(ECANCELLED)
V(ECONNREFUSED)
V(EDESTRUCTION)
V(EFILE)
V(EFORMERR)
V(ELOADIPHLPAPI)
V(ENODATA)
V(ENOMEM)
V(ENONAME)
V(ENOTFOUND)
V(ENOTIMP)
V(ENOTINITIALIZED)
V(EOF)
V(EREFUSED)
V(ESERVFAIL)
V(ETIMEOUT)
#undef V
}
return "UNKNOWN_ARES_ERROR";
}
class ChannelWrap;
struct node_ares_task {
ChannelWrap* channel;
ares_socket_t sock;
uv_poll_t poll_watcher;
};
struct TaskHash {
size_t operator()(node_ares_task* a) const {
return std::hash<ares_socket_t>()(a->sock);
}
};
struct TaskEqual {
inline bool operator()(node_ares_task* a, node_ares_task* b) const {
return a->sock == b->sock;
}
};
using node_ares_task_list =
std::unordered_set<node_ares_task*, TaskHash, TaskEqual>;
class ChannelWrap : public AsyncWrap {
public:
ChannelWrap(Environment* env, Local<Object> object);
~ChannelWrap();
static void New(const FunctionCallbackInfo<Value>& args);
void Setup();
void EnsureServers();
void CleanupTimer();
inline uv_timer_t* timer_handle() { return timer_handle_; }
inline ares_channel cares_channel() { return channel_; }
inline bool query_last_ok() const { return query_last_ok_; }
inline void set_query_last_ok(bool ok) { query_last_ok_ = ok; }
inline bool is_servers_default() const { return is_servers_default_; }
inline void set_is_servers_default(bool is_default) {
is_servers_default_ = is_default;
}
inline node_ares_task_list* task_list() { return &task_list_; }
size_t self_size() const override { return sizeof(this); }
static void AresTimeout(uv_timer_t* handle);
private:
uv_timer_t* timer_handle_;
ares_channel channel_;
bool query_last_ok_;
bool is_servers_default_;
bool library_inited_;
node_ares_task_list task_list_;
};
ChannelWrap::ChannelWrap(Environment* env,
Local<Object> object)
: AsyncWrap(env, object, PROVIDER_DNSCHANNEL),
timer_handle_(nullptr),
channel_(nullptr),
query_last_ok_(true),
is_servers_default_(true),
library_inited_(false) {
MakeWeak<ChannelWrap>(this);
Setup();
}
void ChannelWrap::New(const FunctionCallbackInfo<Value>& args) {
CHECK(args.IsConstructCall());
CHECK_EQ(args.Length(), 0);
Environment* env = Environment::GetCurrent(args);
new ChannelWrap(env, args.This());
}
class GetAddrInfoReqWrap : public ReqWrap<uv_getaddrinfo_t> {
public:
GetAddrInfoReqWrap(Environment* env,
Local<Object> req_wrap_obj,
bool verbatim);
~GetAddrInfoReqWrap();
size_t self_size() const override { return sizeof(*this); }
bool verbatim() const { return verbatim_; }
private:
const bool verbatim_;
};
GetAddrInfoReqWrap::GetAddrInfoReqWrap(Environment* env,
Local<Object> req_wrap_obj,
bool verbatim)
: ReqWrap(env, req_wrap_obj, AsyncWrap::PROVIDER_GETADDRINFOREQWRAP)
, verbatim_(verbatim) {
Wrap(req_wrap_obj, this);
}
GetAddrInfoReqWrap::~GetAddrInfoReqWrap() {
ClearWrap(object());
}
class GetNameInfoReqWrap : public ReqWrap<uv_getnameinfo_t> {
public:
GetNameInfoReqWrap(Environment* env, Local<Object> req_wrap_obj);
~GetNameInfoReqWrap();
size_t self_size() const override { return sizeof(*this); }
};
GetNameInfoReqWrap::GetNameInfoReqWrap(Environment* env,
Local<Object> req_wrap_obj)
: ReqWrap(env, req_wrap_obj, AsyncWrap::PROVIDER_GETNAMEINFOREQWRAP) {
Wrap(req_wrap_obj, this);
}
GetNameInfoReqWrap::~GetNameInfoReqWrap() {
ClearWrap(object());
}
/* 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);
CHECK_EQ(false, channel->task_list()->empty());
ares_process_fd(channel->cares_channel(), ARES_SOCKET_BAD, ARES_SOCKET_BAD);
}
void ares_poll_cb(uv_poll_t* watcher, int status, int events) {
node_ares_task* task = ContainerOf(&node_ares_task::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_handle_t* watcher) {
node_ares_task* task = ContainerOf(&node_ares_task::poll_watcher,
reinterpret_cast<uv_poll_t*>(watcher));
free(task);
}
/* Allocates and returns a new node_ares_task */
node_ares_task* ares_task_create(ChannelWrap* channel, ares_socket_t sock) {
auto task = node::UncheckedMalloc<node_ares_task>(1);
if (task == nullptr) {
/* Out of memory. */
return nullptr;
}
task->channel = channel;
task->sock = sock;
if (uv_poll_init_socket(channel->env()->event_loop(),
&task->poll_watcher, sock) < 0) {
/* This should never happen. */
free(task);
return nullptr;
}
return task;
}
/* 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);
node_ares_task* task;
node_ares_task 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 */
/* If this is the first socket then start the timer. */
uv_timer_t* timer_handle = channel->timer_handle();
if (!uv_is_active(reinterpret_cast<uv_handle_t*>(timer_handle))) {
CHECK(channel->task_list()->empty());
uv_timer_start(timer_handle, ChannelWrap::AresTimeout, 1000, 1000);
}
task = ares_task_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 {
/* read == 0 and write == 0 this is c-ares's way of notifying us that */
/* the socket is now closed. We must free the data associated with */
/* socket. */
CHECK(task &&
"When an ares socket is closed we should have a handle for it");
channel->task_list()->erase(it);
uv_close(reinterpret_cast<uv_handle_t*>(&task->poll_watcher),
ares_poll_close_cb);
if (channel->task_list()->empty()) {
uv_timer_stop(channel->timer_handle());
}
}
}
Local<Array> HostentToAddresses(Environment* env,
struct hostent* host,
Local<Array> append_to = Local<Array>()) {
EscapableHandleScope scope(env->isolate());
auto context = env->context();
bool append = !append_to.IsEmpty();
Local<Array> addresses = append ? append_to : Array::New(env->isolate());
size_t offset = addresses->Length();
char ip[INET6_ADDRSTRLEN];
for (uint32_t i = 0; host->h_addr_list[i] != nullptr; ++i) {
uv_inet_ntop(host->h_addrtype, host->h_addr_list[i], ip, sizeof(ip));
Local<String> address = OneByteString(env->isolate(), ip);
addresses->Set(context, i + offset, address).FromJust();
}
return append ? addresses : scope.Escape(addresses);
}
Local<Array> HostentToNames(Environment* env,
struct hostent* host,
Local<Array> append_to = Local<Array>()) {
EscapableHandleScope scope(env->isolate());
auto context = env->context();
bool append = !append_to.IsEmpty();
Local<Array> names = append ? append_to : Array::New(env->isolate());
size_t offset = names->Length();
for (uint32_t i = 0; host->h_aliases[i] != nullptr; ++i) {
Local<String> address = OneByteString(env->isolate(), host->h_aliases[i]);
names->Set(context, i + offset, address).FromJust();
}
return append ? names : scope.Escape(names);
}
void safe_free_hostent(struct hostent* host) {
int idx;
if (host->h_addr_list != nullptr) {
idx = 0;
while (host->h_addr_list[idx]) {
free(host->h_addr_list[idx++]);
}
free(host->h_addr_list);
host->h_addr_list = 0;
}
if (host->h_aliases != nullptr) {
idx = 0;
while (host->h_aliases[idx]) {
free(host->h_aliases[idx++]);
}
free(host->h_aliases);
host->h_aliases = 0;
}
if (host->h_name != nullptr) {
free(host->h_name);
}
host->h_addrtype = host->h_length = 0;
}
void cares_wrap_hostent_cpy(struct hostent* dest, struct hostent* src) {
dest->h_addr_list = nullptr;
dest->h_addrtype = 0;
dest->h_aliases = nullptr;
dest->h_length = 0;
dest->h_name = nullptr;
/* copy `h_name` */
size_t name_size = strlen(src->h_name) + 1;
dest->h_name = node::Malloc<char>(name_size);
memcpy(dest->h_name, src->h_name, name_size);
/* copy `h_aliases` */
size_t alias_count;
size_t cur_alias_length;
for (alias_count = 0;
src->h_aliases[alias_count] != nullptr;
alias_count++) {
}
dest->h_aliases = node::Malloc<char*>(alias_count + 1);
for (size_t i = 0; i < alias_count; i++) {
cur_alias_length = strlen(src->h_aliases[i]);
dest->h_aliases[i] = node::Malloc(cur_alias_length + 1);
memcpy(dest->h_aliases[i], src->h_aliases[i], cur_alias_length + 1);
}
dest->h_aliases[alias_count] = nullptr;
/* copy `h_addr_list` */
size_t list_count;
for (list_count = 0;
src->h_addr_list[list_count] != nullptr;
list_count++) {
}
dest->h_addr_list = node::Malloc<char*>(list_count + 1);
for (size_t i = 0; i < list_count; i++) {
dest->h_addr_list[i] = node::Malloc(src->h_length);
memcpy(dest->h_addr_list[i], src->h_addr_list[i], src->h_length);
}
dest->h_addr_list[list_count] = nullptr;
/* work after work */
dest->h_length = src->h_length;
dest->h_addrtype = src->h_addrtype;
}
class QueryWrap;
struct CaresAsyncData {
QueryWrap* wrap;
int status;
bool is_host;
union {
hostent* host;
unsigned char* buf;
} data;
int len;
uv_async_t async_handle;
};
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;
int r;
if (!library_inited_) {
// 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. */
r = ares_init_options(&channel_,
&options,
ARES_OPT_FLAGS | ARES_OPT_SOCK_STATE_CB);
if (r != ARES_SUCCESS) {
ares_library_cleanup();
return env()->ThrowError(ToErrorCodeString(r));
}
library_inited_ = true;
/* Initialize the timeout timer. The timer won't be started until the */
/* first socket is opened. */
CleanupTimer();
timer_handle_ = new uv_timer_t();
timer_handle_->data = static_cast<void*>(this);
uv_timer_init(env()->event_loop(), timer_handle_);
}
ChannelWrap::~ChannelWrap() {
if (library_inited_) {
// This decreases the reference counter increased by ares_library_init().
ares_library_cleanup();
}
ares_destroy(channel_);
CleanupTimer();
}
void ChannelWrap::CleanupTimer() {
if (timer_handle_ == nullptr) return;
uv_close(reinterpret_cast<uv_handle_t*>(timer_handle_),
[](uv_handle_t* handle) {
delete reinterpret_cast<uv_timer_t*>(handle);
});
timer_handle_ = nullptr;
}
/**
* 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_);
Setup();
}
class QueryWrap : public AsyncWrap {
public:
QueryWrap(ChannelWrap* channel, Local<Object> req_wrap_obj)
: AsyncWrap(channel->env(), req_wrap_obj, AsyncWrap::PROVIDER_QUERYWRAP),
channel_(channel) {
if (env()->in_domain()) {
req_wrap_obj->Set(env()->domain_string(),
env()->domain_array()->Get(env()->context(), 0)
.ToLocalChecked());
}
Wrap(req_wrap_obj, this);
// Make sure the channel object stays alive during the query lifetime.
req_wrap_obj->Set(env()->context(),
env()->channel_string(),
channel->object()).FromJust();
}
~QueryWrap() override {
CHECK_EQ(false, persistent().IsEmpty());
ClearWrap(object());
persistent().Reset();
}
// Subclasses should implement the appropriate Send method.
virtual int Send(const char* name) {
UNREACHABLE();
return 0;
}
virtual int Send(const char* name, int family) {
UNREACHABLE();
return 0;
}
protected:
void AresQuery(const char* name,
int dnsclass,
int type) {
channel_->EnsureServers();
ares_query(channel_->cares_channel(), name, dnsclass, type, Callback,
static_cast<void*>(this));
}
static void CaresAsyncClose(uv_handle_t* handle) {
uv_async_t* async = reinterpret_cast<uv_async_t*>(handle);
auto data = static_cast<struct CaresAsyncData*>(async->data);
delete data->wrap;
delete data;
}
static void CaresAsyncCb(uv_async_t* handle) {
auto data = static_cast<struct CaresAsyncData*>(handle->data);
QueryWrap* wrap = data->wrap;
int status = data->status;
if (status != ARES_SUCCESS) {
wrap->ParseError(status);
} else if (!data->is_host) {
unsigned char* buf = data->data.buf;
wrap->Parse(buf, data->len);
free(buf);
} else {
hostent* host = data->data.host;
wrap->Parse(host);
safe_free_hostent(host);
free(host);
}
uv_close(reinterpret_cast<uv_handle_t*>(handle), CaresAsyncClose);
}
static void Callback(void *arg, int status, int timeouts,
unsigned char* answer_buf, int answer_len) {
QueryWrap* wrap = static_cast<QueryWrap*>(arg);
unsigned char* buf_copy = nullptr;
if (status == ARES_SUCCESS) {
buf_copy = node::Malloc<unsigned char>(answer_len);
memcpy(buf_copy, answer_buf, answer_len);
}
CaresAsyncData* data = new CaresAsyncData();
data->status = status;
data->wrap = wrap;
data->is_host = false;
data->data.buf = buf_copy;
data->len = answer_len;
uv_async_t* async_handle = &data->async_handle;
CHECK_EQ(0, uv_async_init(wrap->env()->event_loop(),
async_handle,
CaresAsyncCb));
wrap->channel_->set_query_last_ok(status != ARES_ECONNREFUSED);
async_handle->data = data;
uv_async_send(async_handle);
}
static void Callback(void *arg, int status, int timeouts,
struct hostent* host) {
QueryWrap* wrap = static_cast<QueryWrap*>(arg);
struct hostent* host_copy = nullptr;
if (status == ARES_SUCCESS) {
host_copy = node::Malloc<hostent>(1);
cares_wrap_hostent_cpy(host_copy, host);
}
CaresAsyncData* data = new CaresAsyncData();
data->status = status;
data->data.host = host_copy;
data->wrap = wrap;
data->is_host = true;
uv_async_t* async_handle = &data->async_handle;
CHECK_EQ(0, uv_async_init(wrap->env()->event_loop(),
async_handle,
CaresAsyncCb));
wrap->channel_->set_query_last_ok(status != ARES_ECONNREFUSED);
async_handle->data = data;
uv_async_send(async_handle);
}
void CallOnComplete(Local<Value> answer,
Local<Value> extra = Local<Value>()) {
HandleScope handle_scope(env()->isolate());
Context::Scope context_scope(env()->context());
Local<Value> argv[] = {
Integer::New(env()->isolate(), 0),
answer,
extra
};
const int argc = arraysize(argv) - extra.IsEmpty();
MakeCallback(env()->oncomplete_string(), argc, argv);
}
void ParseError(int status) {
CHECK_NE(status, ARES_SUCCESS);
HandleScope handle_scope(env()->isolate());
Context::Scope context_scope(env()->context());
const char* code = ToErrorCodeString(status);
Local<Value> arg = OneByteString(env()->isolate(), code);
MakeCallback(env()->oncomplete_string(), 1, &arg);
}
// Subclasses should implement the appropriate Parse method.
virtual void Parse(unsigned char* buf, int len) {
UNREACHABLE();
}
virtual void Parse(struct hostent* host) {
UNREACHABLE();
}
ChannelWrap* channel_;
};
template<typename T>
Local<Array> AddrTTLToArray(Environment* env,
const T* addrttls,
size_t naddrttls) {
auto isolate = env->isolate();
EscapableHandleScope escapable_handle_scope(isolate);
auto context = env->context();
Local<Array> ttls = Array::New(isolate, naddrttls);
for (size_t i = 0; i < naddrttls; i++) {
auto value = Integer::New(isolate, addrttls[i].ttl);
ttls->Set(context, i, value).FromJust();
}
return escapable_handle_scope.Escape(ttls);
}
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());
auto context = env->context();
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, NULL, 0, AF_INET, &host);
break;
default:
CHECK(0 && "Bad NS type");
break;
}
if (status != ARES_SUCCESS)
return status;
/* 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 && host->h_name && host->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(context,
ret->Length(),
OneByteString(env->isolate(), host->h_name)).FromJust();
ares_free_hostent(host);
return ARES_SUCCESS;
}
if (*type == ns_t_cname_or_a)
*type = ns_t_a;
if (*type == ns_t_ns) {
HostentToNames(env, host, ret);
} else if (*type == ns_t_ptr) {
uint32_t offset = ret->Length();
for (uint32_t i = 0; host->h_aliases[i] != NULL; i++) {
ret->Set(context,
i + offset,
OneByteString(env->isolate(), host->h_aliases[i])).FromJust();
}
} else {
HostentToAddresses(env, host, ret);
}
ares_free_hostent(host);
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());
auto context = env->context();
struct ares_mx_reply* mx_start;
int status = ares_parse_mx_reply(buf, len, &mx_start);
if (status != ARES_SUCCESS) {
return status;
}
Local<String> exchange_symbol = env->exchange_string();
Local<String> priority_symbol = env->priority_string();
Local<String> type_symbol = env->type_string();
Local<String> mx_symbol = env->dns_mx_string();
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(context,
exchange_symbol,
OneByteString(env->isolate(), current->host)).FromJust();
mx_record->Set(context,
priority_symbol,
Integer::New(env->isolate(), current->priority)).FromJust();
if (need_type)
mx_record->Set(context, type_symbol, mx_symbol).FromJust();
ret->Set(context, i + offset, mx_record).FromJust();
}
ares_free_data(mx_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());
auto context = env->context();
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);
// 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(context, env->entries_string(), txt_chunk).FromJust();
elem->Set(context,
env->type_string(),
env->dns_txt_string()).FromJust();
ret->Set(context, offset + i++, elem).FromJust();
} else {
ret->Set(context, offset + i++, txt_chunk).FromJust();
}
}
txt_chunk = Array::New(env->isolate());
j = 0;
}
txt_chunk->Set(context, j++, txt).FromJust();
}
// Push last chunk if it isn't empty
if (!txt_chunk.IsEmpty()) {
if (need_type) {
Local<Object> elem = Object::New(env->isolate());
elem->Set(context, env->entries_string(), txt_chunk).FromJust();
elem->Set(context,
env->type_string(),
env->dns_txt_string()).FromJust();
ret->Set(context, offset + i, elem).FromJust();
} else {
ret->Set(context, offset + i, txt_chunk).FromJust();
}
}
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());
auto context = env->context();
struct ares_srv_reply* srv_start;
int status = ares_parse_srv_reply(buf, len, &srv_start);
if (status != ARES_SUCCESS) {
return status;
}
Local<String> name_symbol = env->name_string();
Local<String> port_symbol = env->port_string();
Local<String> priority_symbol = env->priority_string();
Local<String> weight_symbol = env->weight_string();
Local<String> type_symbol = env->type_string();
Local<String> srv_symbol = env->dns_srv_string();
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(context,
name_symbol,
OneByteString(env->isolate(), current->host)).FromJust();
srv_record->Set(context,
port_symbol,
Integer::New(env->isolate(), current->port)).FromJust();
srv_record->Set(context,
priority_symbol,
Integer::New(env->isolate(), current->priority)).FromJust();
srv_record->Set(context,
weight_symbol,
Integer::New(env->isolate(), current->weight)).FromJust();
if (need_type)
srv_record->Set(context, type_symbol, srv_symbol).FromJust();
ret->Set(context, i + offset, srv_record).FromJust();
}
ares_free_data(srv_start);