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/**
* @file socket.c
*
* @brief management of sockets
*
* receiver reads from here, sender writes to here
*
*/
/*
* Copyright (C) 2005 Jan Hutter, Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include <pthread.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include "socket.h"
#include "utils/allocator.h"
typedef struct private_socket_s private_socket_t;
struct private_socket_s{
/**
* public functions
*/
socket_t public;
/**
* currently we only have one socket, maybe more in the future ?
*/
int socket_fd;
};
/**
* implementation of socket_t.receive
*/
status_t receiver(private_socket_t *this, packet_t **packet)
{
char buffer[MAX_PACKET];
int oldstate;
packet_t *pkt = packet_create(AF_INET);
/* add packet destroy handler for cancellation, enable cancellation */
pthread_cleanup_push((void(*)(void*))pkt->destroy, (void*)pkt);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldstate);
/* do the read */
pkt->data.len = recvfrom(this->socket_fd, buffer, MAX_PACKET, 0,
&(pkt->source), &(pkt->sockaddr_len));
/* reset cancellation, remove packet destroy handler (without executing) */
pthread_setcancelstate(oldstate, NULL);
pthread_cleanup_pop(0);
/* TODO: get senders destination address, using
* IP_PKTINFO and recvmsg */
if (pkt->data.len < 0)
{
pkt->destroy(pkt);
/* TODO: log detailed error */
return FAILED;
}
/* fill in packet */
pkt->data.ptr = allocator_alloc(pkt->data.len);
memcpy(pkt->data.ptr, buffer, pkt->data.len);
/* return packet */
*packet = pkt;
return SUCCESS;
}
/**
* implementation of socket_t.send
*/
status_t sender(private_socket_t *this, packet_t *packet)
{
ssize_t bytes_sent;
/* send data */
bytes_sent = sendto(this->socket_fd, packet->data.ptr, packet->data.len,
0, &(packet->destination), packet->sockaddr_len);
if (bytes_sent != packet->data.len)
{
/* TODO: log detailed error */
return FAILED;
}
return SUCCESS;
}
/**
* implementation of socket_t.destroy
*/
status_t destroy(private_socket_t *this)
{
close(this->socket_fd);
allocator_free(this);
return SUCCESS;
}
socket_t *socket_create(u_int16_t port)
{
private_socket_t *this = allocator_alloc_thing(private_socket_t);
struct sockaddr_in addr;
/* public functions */
this->public.send = (status_t(*)(socket_t*, packet_t*))sender;
this->public.receive = (status_t(*)(socket_t*, packet_t**))receiver;
this->public.destroy = (status_t(*)(socket_t*))destroy;
/* create default ipv4 socket */
this->socket_fd = socket(PF_INET, SOCK_DGRAM, 0);
if (this->socket_fd < 0) {
allocator_free(this);
/* TODO: log detailed error */
return NULL;
}
/* bind socket to all interfaces */
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(port);
if (bind(this->socket_fd,(struct sockaddr*)&addr, sizeof(addr)) < 0) {
allocator_free(this);
/* TODO: log detailed error */
return NULL;
}
return (socket_t*)this;
}
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