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/* Routines to talk to the MSC using the IPA Protocol */
/*
* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2010 by On-Waves
* All Rights Reserved
*
* 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 <openbsc/bsc_msc.h>
#include <openbsc/debug.h>
#include <osmocore/write_queue.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
/* called in the case of a non blocking connect */
static int msc_connection_connect(struct bsc_fd *fd, unsigned int what)
{
int rc;
int val;
struct write_queue *queue;
socklen_t len = sizeof(val);
if ((what & BSC_FD_WRITE) == 0) {
LOGP(DMSC, LOGL_ERROR, "Callback but not readable.\n");
return -1;
}
/* check the socket state */
rc = getsockopt(fd->fd, SOL_SOCKET, SO_ERROR, &val, &len);
if (rc != 0) {
LOGP(DMSC, LOGL_ERROR, "getsockopt for the MSC socket failed.\n");
goto error;
}
if (val != 0) {
LOGP(DMSC, LOGL_ERROR, "Not connected to the MSC.\n");
goto error;
}
/* go to full operation */
queue = container_of(fd, struct write_queue, bfd);
fd->cb = write_queue_bfd_cb;
fd->when = BSC_FD_READ;
if (!llist_empty(&queue->msg_queue))
fd->when |= BSC_FD_WRITE;
return 0;
error:
bsc_unregister_fd(fd);
close(fd->fd);
fd->fd = -1;
fd->cb = write_queue_bfd_cb;
fd->when = 0;
return -1;
}
static void setnonblocking(struct bsc_fd *fd)
{
int flags;
flags = fcntl(fd->fd, F_GETFL);
if (flags < 0) {
perror("fcntl get failed");
close(fd->fd);
fd->fd = -1;
return;
}
flags |= O_NONBLOCK;
flags = fcntl(fd->fd, F_SETFL, flags);
if (flags < 0) {
perror("fcntl get failed");
close(fd->fd);
fd->fd = -1;
return;
}
}
int connect_to_msc(struct bsc_fd *fd, const char *ip, int port)
{
struct sockaddr_in sin;
int on = 1, ret;
printf("Attempting to connect MSC at %s:%d\n", ip, port);
fd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
fd->data = NULL;
fd->priv_nr = 1;
if (fd->fd < 0) {
perror("Creating TCP socket failed");
return fd->fd;
}
/* make it non blocking */
setnonblocking(fd);
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
inet_aton(ip, &sin.sin_addr);
setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
ret = connect(fd->fd, (struct sockaddr *) &sin, sizeof(sin));
if (ret == -1 && errno == EINPROGRESS) {
LOGP(DMSC, LOGL_ERROR, "MSC Connection in progress\n");
fd->when = BSC_FD_WRITE;
fd->cb = msc_connection_connect;
} else if (ret < 0) {
perror("Connection failed");
close(fd->fd);
fd->fd = -1;
return ret;
} else {
fd->when = BSC_FD_READ;
fd->cb = write_queue_bfd_cb;
}
ret = bsc_register_fd(fd);
if (ret < 0) {
perror("Registering the fd failed");
close(fd->fd);
return ret;
}
return ret;
}
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