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/*
* Copyright (C) 2003-2011 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "udp_server.h"
#include "io_thread.h"
#include "glib_socket.h"
#include "gcc.h"
#include <glib.h>
#include <unistd.h>
#include <sys/time.h>
#include <errno.h>
#ifdef WIN32
#include <ws2tcpip.h>
#include <winsock.h>
#else
#include <sys/socket.h>
#include <netinet/in.h>
#endif
#if GCC_CHECK_VERSION(4, 2)
/* allow C99 initialisers on struct sockaddr_in, even if the
(non-portable) attribute "sin_zero" is missing */
#pragma GCC diagnostic ignored "-Wmissing-field-initializers"
#endif
struct udp_server {
const struct udp_server_handler *handler;
void *handler_ctx;
int fd;
GIOChannel *channel;
GSource *source;
char buffer[8192];
};
static gboolean
udp_in_event(G_GNUC_UNUSED GIOChannel *source,
G_GNUC_UNUSED GIOCondition condition,
gpointer data)
{
struct udp_server *udp = data;
struct sockaddr_storage address_storage;
struct sockaddr *address = (struct sockaddr *)&address_storage;
socklen_t address_length = sizeof(address_storage);
ssize_t nbytes = recvfrom(udp->fd, udp->buffer, sizeof(udp->buffer),
#ifdef WIN32
0,
#else
MSG_DONTWAIT,
#endif
address, &address_length);
if (nbytes <= 0)
return true;
udp->handler->datagram(udp->fd, udp->buffer, nbytes,
address, address_length, udp->handler_ctx);
return true;
}
struct udp_server *
udp_server_new(unsigned port,
const struct udp_server_handler *handler, void *ctx,
GError **error_r)
{
int fd = socket(PF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
g_set_error(error_r, udp_server_quark(), errno,
"failed to create UDP socket: %s",
g_strerror(errno));
return NULL;
}
const struct sockaddr_in address = {
.sin_family = AF_INET,
.sin_addr = {
.s_addr = htonl(INADDR_ANY),
},
.sin_port = htons(port),
#if defined(__linux__) && !GCC_CHECK_VERSION(4, 2)
.sin_zero = { 0 },
#endif
};
if (bind(fd, (const struct sockaddr *)&address, sizeof(address)) < 0) {
g_set_error(error_r, udp_server_quark(), errno,
"failed to bind UDP port %u: %s",
port, g_strerror(errno));
close(fd);
return NULL;
}
struct udp_server *udp = g_new(struct udp_server, 1);
udp->handler = handler;
udp->handler_ctx = ctx;
udp->fd = fd;
udp->channel = g_io_channel_new_socket(fd);
/* NULL encoding means the stream is binary safe */
g_io_channel_set_encoding(udp->channel, NULL, NULL);
/* no buffering */
g_io_channel_set_buffered(udp->channel, false);
udp->source = g_io_create_watch(udp->channel, G_IO_IN);
g_source_set_callback(udp->source, (GSourceFunc)udp_in_event, udp,
NULL);
g_source_attach(udp->source, io_thread_context());
return udp;
}
void
udp_server_free(struct udp_server *udp)
{
g_source_destroy(udp->source);
g_source_unref(udp->source);
g_io_channel_unref(udp->channel);
close(udp->fd);
g_free(udp);
}
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