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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
*
* 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 "uv.h"
#include "internal.h"
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
/*
* This is called once per second by loop->timer. It is used to
* constantly callback into c-ares for possibly processing timeouts.
*/
static void uv__ares_timeout(uv_timer_t* handle, int status) {
assert(!uv_ares_handles_empty(handle->loop));
ares_process_fd(handle->loop->channel, ARES_SOCKET_BAD, ARES_SOCKET_BAD);
}
static void uv__ares_timer_start(uv_loop_t* loop) {
if (uv_is_active((uv_handle_t*)&loop->timer)) return;
uv_timer_start(&loop->timer, uv__ares_timeout, 1000, 1000);
uv_ref(loop);
}
static void uv__ares_timer_stop(uv_loop_t* loop) {
if (!uv_is_active((uv_handle_t*)&loop->timer)) return;
uv_timer_stop(&loop->timer);
uv_unref(loop);
}
static void uv__ares_io(struct ev_loop* ev, struct ev_io* watcher,
int revents) {
uv_loop_t* loop = ev_userdata(ev);
assert(ev == loop->ev);
/* Reset the idle timer */
uv_timer_again(&loop->timer);
/* Process DNS responses */
ares_process_fd(loop->channel,
revents & EV_READ ? watcher->fd : ARES_SOCKET_BAD,
revents & EV_WRITE ? watcher->fd : ARES_SOCKET_BAD);
}
/* Allocates and returns a new uv_ares_task_t */
static uv_ares_task_t* uv__ares_task_create(uv_loop_t* loop, int fd) {
uv_ares_task_t* h = malloc(sizeof(uv_ares_task_t));
if (h == NULL) {
uv_fatal_error(ENOMEM, "malloc");
return NULL;
}
h->loop = loop;
h->sock = fd;
ev_io_init(&h->read_watcher, uv__ares_io, fd, EV_READ);
ev_io_init(&h->write_watcher, uv__ares_io, fd, EV_WRITE);
h->read_watcher.data = h;
h->write_watcher.data = h;
return h;
}
/* Callback from ares when socket operation is started */
static void uv__ares_sockstate_cb(void* data, ares_socket_t sock,
int read, int write) {
uv_loop_t* loop = data;
uv_ares_task_t* h;
assert((uv_loop_t*)loop->timer.data == loop);
h = uv_find_ares_handle(loop, sock);
if (read || write) {
if (!h) {
/* New socket */
/* If this is the first socket then start the timer. */
if (!uv_is_active((uv_handle_t*)&loop->timer)) {
assert(uv_ares_handles_empty(loop));
uv__ares_timer_start(loop);
}
h = uv__ares_task_create(loop, sock);
uv_add_ares_handle(loop, h);
}
if (read) {
ev_io_start(loop->ev, &h->read_watcher);
} else {
ev_io_stop(loop->ev, &h->read_watcher);
}
if (write) {
ev_io_start(loop->ev, &h->write_watcher);
} else {
ev_io_stop(loop->ev, &h->write_watcher);
}
} 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.
*/
assert(h && "When an ares socket is closed we should have a handle for it");
ev_io_stop(loop->ev, &h->read_watcher);
ev_io_stop(loop->ev, &h->write_watcher);
uv_remove_ares_handle(h);
free(h);
if (uv_ares_handles_empty(loop)) {
uv__ares_timer_stop(loop);
}
}
}
/* c-ares integration initialize and terminate */
/* TODO: share this with windows? */
int uv_ares_init_options(uv_loop_t* loop, ares_channel *channelptr,
struct ares_options *options, int optmask) {
int rc;
/* only allow single init at a time */
if (loop->channel != NULL) {
uv__set_artificial_error(loop, UV_EALREADY);
return -1;
}
/* set our callback as an option */
options->sock_state_cb = uv__ares_sockstate_cb;
options->sock_state_cb_data = loop;
optmask |= ARES_OPT_SOCK_STATE_CB;
/* We do the call to ares_init_option for caller. */
rc = ares_init_options(channelptr, options, optmask);
/* if success, save channel */
if (rc == ARES_SUCCESS) {
loop->channel = *channelptr;
}
/*
* Initialize the timeout timer. The timer won't be started until the
* first socket is opened.
*/
uv_timer_init(loop, &loop->timer);
uv_unref(loop);
loop->timer.data = loop;
return rc;
}
/* TODO share this with windows? */
void uv_ares_destroy(uv_loop_t* loop, ares_channel channel) {
/* only allow destroy if did init */
if (loop->channel) {
uv__ares_timer_stop(loop);
ares_destroy(channel);
loop->channel = NULL;
}
}
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