191 lines
5.0 KiB
C
191 lines
5.0 KiB
C
/**
|
|
* @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 <errno.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "socket.h"
|
|
|
|
#include <globals.h>
|
|
#include <utils/allocator.h>
|
|
#include <utils/logger_manager.h>
|
|
|
|
|
|
typedef struct private_socket_t private_socket_t;
|
|
|
|
/**
|
|
* Private data of an socket_t object
|
|
*/
|
|
struct private_socket_t{
|
|
/**
|
|
* public functions
|
|
*/
|
|
socket_t public;
|
|
|
|
/**
|
|
* currently we only have one socket, maybe more in the future ?
|
|
*/
|
|
int socket_fd;
|
|
/**
|
|
* logger for this socket
|
|
*/
|
|
logger_t *logger;
|
|
};
|
|
|
|
/**
|
|
* 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();
|
|
|
|
/* add packet destroy handler for cancellation, enable cancellation */
|
|
pthread_cleanup_push((void(*)(void*))pkt->destroy, (void*)pkt);
|
|
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldstate);
|
|
|
|
pkt->source = host_create(AF_INET, "0.0.0.0", 0);
|
|
pkt->destination = host_create(AF_INET, "0.0.0.0", 0);
|
|
|
|
|
|
this->logger->log(this->logger, CONTROL|MORE, "going to read from socket");
|
|
/* do the read */
|
|
pkt->data.len = recvfrom(this->socket_fd, buffer, MAX_PACKET, 0,
|
|
pkt->source->get_sockaddr(pkt->source),
|
|
pkt->source->get_sockaddr_len(pkt->source));
|
|
|
|
/* 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);
|
|
this->logger->log(this->logger, ERROR, "error reading from socket: %s", strerror(errno));
|
|
return FAILED;
|
|
}
|
|
|
|
this->logger->log(this->logger, CONTROL, "received packet from %s:%d",
|
|
pkt->source->get_address(pkt->source),
|
|
pkt->source->get_port(pkt->source));
|
|
|
|
/* 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;
|
|
|
|
|
|
this->logger->log(this->logger, CONTROL, "sending packet to %s:%d",
|
|
packet->destination->get_address(packet->destination),
|
|
packet->destination->get_port(packet->destination));
|
|
/* send data */
|
|
bytes_sent = sendto(this->socket_fd, packet->data.ptr, packet->data.len,
|
|
0, packet->destination->get_sockaddr(packet->destination),
|
|
*(packet->destination->get_sockaddr_len(packet->destination)));
|
|
|
|
if (bytes_sent != packet->data.len)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "error writing to socket: %s", strerror(errno));
|
|
return FAILED;
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* implementation of socket_t.destroy
|
|
*/
|
|
status_t destroy(private_socket_t *this)
|
|
{
|
|
close(this->socket_fd);
|
|
global_logger_manager->destroy_logger(global_logger_manager, this->logger);
|
|
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;
|
|
|
|
|
|
this->logger = global_logger_manager->create_logger(global_logger_manager, SOCKET, NULL);
|
|
if (this->logger == NULL)
|
|
{
|
|
allocator_free(this);
|
|
return NULL;
|
|
}
|
|
|
|
/* create default ipv4 socket */
|
|
this->socket_fd = socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (this->socket_fd < 0)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "unable to open socket: %s", strerror(errno));
|
|
global_logger_manager->destroy_logger(global_logger_manager, this->logger);
|
|
allocator_free(this);
|
|
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)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "unable to bind socket to port %d: %s", port, strerror(errno));
|
|
global_logger_manager->destroy_logger(global_logger_manager, this->logger);
|
|
allocator_free(this);
|
|
return NULL;
|
|
}
|
|
|
|
return (socket_t*)this;
|
|
}
|