node/src/node_dns.cc at debugger · bionicpill/node · GitHub

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#include <node_dns.h>

#include <stdlib.h> /* exit() */

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <assert.h>

#include <node_events.h>

#include <v8.h>

#include <ev.h>

#include <udns.h>

namespace node {

using namespace v8;

static ev_io io_watcher;

static ev_timer timer_watcher;

static inline void set_timeout() {

int maxwait = 20;

int wait = dns_timeouts(NULL, maxwait, ev_now(EV_DEFAULT_UC));

ev_timer_stop(EV_DEFAULT_UC_ &timer_watcher);

if (!dns_active(NULL)) return;

if (wait >= 0) {

ev_timer_set(&timer_watcher, static_cast<double>(wait), 0.0);

ev_timer_start(EV_DEFAULT_UC_ &timer_watcher);

}

static inline void maybe_start() {

ev_io_start(EV_DEFAULT_UC_ &io_watcher);

set_timeout();

}

static void ioevent(EV_P_ ev_io *_watcher, int revents) {

assert(revents == EV_READ);

assert(_watcher == &io_watcher);

dns_ioevent(NULL, ev_now(EV_DEFAULT_UC));

if (!dns_active(NULL)) ev_io_stop(EV_DEFAULT_UC_ &io_watcher);

set_timeout();

}

static void timeout(EV_P_ ev_timer *_watcher, int revents) {

assert(revents == EV_TIMEOUT);

assert(_watcher == &timer_watcher);

set_timeout();

}

static void ResolveError(Promise *promise) {

HandleScope scope;

int status = dns_status(NULL);

assert(status < 0);

Local<String> msg = String::New(dns_strerror(status));

Local<Value> argv[2] = { Integer::New(status), msg };

promise->EmitError(2, argv);

}

static void AfterResolveA4(struct dns_ctx *ctx,

struct dns_rr_a4 *result,

void *data) {

assert(ctx == &dns_defctx);

HandleScope scope;

Promise *promise = reinterpret_cast<Promise*>(data);

assert(promise);

if (result == NULL) {

ResolveError(promise);

return;

}

/* canonical name */

Local<String> cname = String::New(result->dnsa4_cname);

/* Time-To-Live (TTL) value */

Local<Integer> ttl = Integer::New(result->dnsa4_ttl);

Local<Array> addresses = Array::New(result->dnsa4_nrr);

for (int i = 0; i < result->dnsa4_nrr; i++) {

HandleScope loop_scope;

char ip[INET_ADDRSTRLEN];

dns_ntop(AF_INET, &(result->dnsa4_addr[i]), ip, INET_ADDRSTRLEN);

Local<String> address = String::New(ip);

addresses->Set(Integer::New(i), address);

}

Local<Value> argv[3] = { addresses, ttl, cname };

promise->EmitSuccess(3, argv);

}

static void AfterResolveA6(struct dns_ctx *ctx,

struct dns_rr_a6 *result,

void *data) {

assert(ctx == &dns_defctx);

HandleScope scope;

Promise *promise = reinterpret_cast<Promise*>(data);

assert(promise);

if (result == NULL) {

ResolveError(promise);

return;

}

/* canonical name */

Local<String> cname = String::New(result->dnsa6_cname);

/* Time-To-Live (TTL) value */

Local<Integer> ttl = Integer::New(result->dnsa6_ttl);

Local<Array> addresses = Array::New(result->dnsa6_nrr);

for (int i = 0; i < result->dnsa6_nrr; i++) {

HandleScope loop_scope;

char ip[INET6_ADDRSTRLEN];

dns_ntop(AF_INET6, &(result->dnsa6_addr[i]), ip, INET6_ADDRSTRLEN);

Local<String> address = String::New(ip);

addresses->Set(Integer::New(i), address);

}

Local<Value> argv[3] = { addresses, ttl, cname };

promise->EmitSuccess(3, argv);

}

static Handle<Value> ResolveA(int type, const Arguments& args) {

HandleScope scope;

if (args.Length() == 0 || !args[0]->IsString()) {

return ThrowException(Exception::Error(

String::New("Argument must be a string.")));

}

String::Utf8Value name(args[0]->ToString());

Promise *promise = Promise::Create();

struct dns_query *query;

switch (type) {

case DNS_T_A:

query = dns_submit_a4(NULL, *name, 0, AfterResolveA4, promise);

break;

case DNS_T_AAAA:

query = dns_submit_a6(NULL, *name, 0, AfterResolveA6, promise);

break;

default:

return ThrowException(Exception::Error(String::New("Unsupported type")));

}

assert(query); // TODO(ry) better error handling.

maybe_start();

return scope.Close(promise->Handle());

}

static Handle<Value> ResolveA4(const Arguments& args) {

return ResolveA(DNS_T_A, args);

}

static Handle<Value> ResolveA6(const Arguments& args) {

return ResolveA(DNS_T_AAAA, args);

}

static void AfterReverse(struct dns_ctx *ctx,

struct dns_rr_ptr *result,

void *data) {

assert(ctx == &dns_defctx);

HandleScope scope;

Promise *promise = reinterpret_cast<Promise*>(data);

assert(promise);

if (result == NULL) {

ResolveError(promise);

return;

}

/* canonical name */

Local<String> cname = String::New(result->dnsptr_cname);

/* Time-To-Live (TTL) value */

Local<Integer> ttl = Integer::New(result->dnsptr_ttl);

Local<Array> domains = Array::New();

for (int i = 0; i < result->dnsptr_nrr; i++) {

HandleScope loop_scope;

Local<String> domain = String::New(result->dnsptr_ptr[i]);

domains->Set(Integer::New(i), domain);

}

Local<Value> argv[3] = { domains, ttl, cname };

promise->EmitSuccess(3, argv);

}

static Handle<Value> Reverse(const Arguments& args) {

HandleScope scope;

if (args.Length() == 0 || !args[0]->IsString()) {

return ThrowException(Exception::Error(

String::New("Argument must be a string.")));

}

String::Utf8Value ip_address(args[0]->ToString());

union {

struct in_addr addr;

struct in6_addr addr6;

} a;

bool v4;

if (dns_pton(AF_INET, *ip_address, &a.addr) > 0) {

v4 = true;

} else if (dns_pton(AF_INET6, *ip_address, &a.addr6) > 0) {

v4 = false;

} else {

return ThrowException(Exception::Error(String::New("Invalid IP address")));

}

Promise *promise = Promise::Create();

struct dns_query *query;

if (v4) {

query = dns_submit_a4ptr(NULL, &a.addr, AfterReverse, promise);

} else {

query = dns_submit_a6ptr(NULL, &a.addr6, AfterReverse, promise);

}

assert(query); // TODO(ry) better error handling.

maybe_start();

return scope.Close(promise->Handle());

}

void DNS::Initialize(Handle<Object> target) {

if (dns_init(NULL, 0) < 0) {

fprintf(stderr, "Error initializing UDNS context\n");

exit(-2);

}

int fd = dns_open(NULL);

ev_io_init(&io_watcher, ioevent, fd, EV_READ);

ev_init(&timer_watcher, timeout);

HandleScope scope;

target->Set(String::NewSymbol("TEMPFAIL"), Integer::New(DNS_E_TEMPFAIL));

target->Set(String::NewSymbol("PROTOCOL"), Integer::New(DNS_E_PROTOCOL));

target->Set(String::NewSymbol("NXDOMAIN"), Integer::New(DNS_E_NXDOMAIN));

target->Set(String::NewSymbol("NODATA"), Integer::New(DNS_E_NODATA));

target->Set(String::NewSymbol("NOMEM"), Integer::New(DNS_E_NOMEM));

target->Set(String::NewSymbol("BADQUERY"), Integer::New(DNS_E_BADQUERY));

Local<FunctionTemplate> resolve4 = FunctionTemplate::New(ResolveA4);

target->Set(String::NewSymbol("resolve4"), resolve4->GetFunction());

Local<FunctionTemplate> resolve6 = FunctionTemplate::New(ResolveA6);

target->Set(String::NewSymbol("resolve6"), resolve6->GetFunction());

Local<FunctionTemplate> reverse = FunctionTemplate::New(Reverse);

target->Set(String::NewSymbol("reverse"), reverse->GetFunction());

}

} // namespace node

node/src/node_dns.cc at debugger · bionicpill/node · GitHub

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