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/* Copyright (C) 2014 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libknot/errcode.h>
#include <libknot/internal/utils.h>
#include "daemon/io.h"
#include "daemon/network.h"
#include "daemon/worker.h"
static void *handle_alloc(uv_loop_t *loop, size_t size)
{
uv_handle_t *handle = malloc(size);
if (handle) {
memset(handle, 0, size);
}
return handle;
}
static void handle_free(uv_handle_t *handle)
{
free(handle);
}
static void handle_getbuf(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf)
{
/* Worker has single buffer which is reused for all incoming
* datagrams / stream reads, the content of the buffer is
* guaranteed to be unchanged only for the duration of
* udp_read() and tcp_read().
*/
uv_loop_t *loop = handle->loop;
struct worker_ctx *worker = loop->data;
buf->base = (char *)worker->bufs.wire;
buf->len = sizeof(worker->bufs.wire);
}
void udp_recv(uv_udp_t *handle, ssize_t nread, const uv_buf_t *buf,
const struct sockaddr *addr, unsigned flags)
{
uv_loop_t *loop = handle->loop;
struct worker_ctx *worker = loop->data;
if (nread <= 0) {
worker_exec(worker, (uv_handle_t *)handle, NULL, addr);
return;
}
knot_pkt_t *query = knot_pkt_new(buf->base, nread, worker->mm);
query->max_size = sizeof(worker->bufs.wire);
worker_exec(worker, (uv_handle_t *)handle, query, addr);
knot_pkt_free(&query);
}
int udp_bind(struct endpoint *ep, struct sockaddr *addr)
{
uv_udp_t *handle = &ep->udp;
unsigned flags = UV_UDP_REUSEADDR;
if (addr->sa_family == AF_INET6) {
flags |= UV_UDP_IPV6ONLY;
}
int ret = uv_udp_bind(handle, addr, flags);
if (ret != 0) {
return ret;
}
handle->data = NULL;
return io_start_read((uv_handle_t *)handle);
}
void udp_unbind(struct endpoint *ep)
{
uv_udp_t *handle = &ep->udp;
uv_close((uv_handle_t *)handle, NULL);
}
static void tcp_recv(uv_stream_t *handle, ssize_t nread, const uv_buf_t *buf)
{
uv_loop_t *loop = handle->loop;
struct worker_ctx *worker = loop->data;
/* Check for originator connection close */
if (nread <= 0 && handle->data == 0) {
io_close((uv_handle_t *)handle);
return;
} else if (nread < 2) {
/* Not enough bytes to read length */
worker_exec(worker, (uv_handle_t *)handle, NULL, NULL);
return;
}
/** @todo This is not going to work if the packet is fragmented in the stream ! */
uint16_t nbytes = wire_read_u16((const uint8_t *)buf->base);
if (nbytes + 2 < nread) {
worker_exec(worker, (uv_handle_t *)handle, NULL, NULL);
return;
}
knot_pkt_t *query = knot_pkt_new(buf->base + 2, nbytes, worker->mm);
query->max_size = sizeof(worker->bufs.wire);
int ret = worker_exec(worker, (uv_handle_t *)handle, query, NULL);
if (ret == 0) {
/* Push - pull, stop reading from this handle until
* the task is finished. Since the handle has no track of the
* pending tasks, it might be freed before the task finishes
* leading various errors. */
uv_unref((uv_handle_t *)handle);
io_stop_read((uv_handle_t *)handle);
}
knot_pkt_free(&query);
}
static void tcp_accept(uv_stream_t *master, int status)
{
if (status != 0) {
return;
}
uv_stream_t *client = (uv_stream_t *)io_create(master->loop, SOCK_STREAM);
if (!client || uv_accept(master, client) != 0) {
handle_free((uv_handle_t *)client);
return;
}
io_start_read((uv_handle_t *)client);
}
int tcp_bind(struct endpoint *ep, struct sockaddr *addr)
{
uv_tcp_t *handle = &ep->tcp;
unsigned flags = UV_UDP_REUSEADDR;
if (addr->sa_family == AF_INET6) {
flags |= UV_UDP_IPV6ONLY;
}
int ret = uv_tcp_bind(handle, addr, flags);
if (ret != 0) {
return ret;
}
ret = uv_listen((uv_stream_t *)handle, 16, tcp_accept);
if (ret != 0) {
tcp_unbind(ep);
return ret;
}
handle->data = NULL;
return 0;
}
void tcp_unbind(struct endpoint *ep)
{
uv_close((uv_handle_t *)&ep->tcp, NULL);
}
uv_handle_t *io_create(uv_loop_t *loop, int type)
{
if (type == SOCK_DGRAM) {
uv_udp_t *handle = handle_alloc(loop, sizeof(*handle));
if (handle) {
uv_udp_init(loop, handle);
}
return (uv_handle_t *)handle;
} else {
uv_tcp_t *handle = handle_alloc(loop, sizeof(*handle));
if (handle) {
uv_tcp_init(loop, handle);
}
return (uv_handle_t *)handle;
}
}
void io_close(uv_handle_t *handle)
{
uv_close(handle, (uv_close_cb) handle_free);
}
int io_start_read(uv_handle_t *handle)
{
if (handle->type == UV_UDP) {
return uv_udp_recv_start((uv_udp_t *)handle, &handle_getbuf, &udp_recv);
} else {
return uv_read_start((uv_stream_t *)handle, &handle_getbuf, &tcp_recv);
}
}
int io_stop_read(uv_handle_t *handle)
{
if (handle->type == UV_UDP) {
return uv_udp_recv_stop((uv_udp_t *)handle);
} else {
return uv_read_stop((uv_stream_t *)handle);
}
}
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