/*
 * In this module we handle routing of outbound MO calls
 * to the outcall socket provided by themwi-sip-out.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <syslog.h>
#include <unistd.h>
#include "../include/mncc.h"
#include "../include/gsm48_const.h"
#include "struct.h"

extern struct socket_conn outcall_conn;

static char outcall_socket_pathname[] = "/var/gsm/outcall_socket";

connect_outcall_socket()
{
	struct sockaddr_un sa;
	unsigned sa_len;
	int fd, rc;

	if (outcall_conn.fd >= 0)
		return(0);
	fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
	if (fd < 0) {
		syslog(LOG_CRIT, "socket(AF_UNIX, SOCK_SEQPACKET, 0): %m");
		return(-1);
	}
	fill_sockaddr_un(outcall_socket_pathname, &sa, &sa_len);
	rc = connect(fd, (struct sockaddr *) &sa, sa_len);
	if (rc < 0) {
		syslog(LOG_ERR, "connect to %s: %m", outcall_socket_pathname);
		close(fd);
		return(-1);
	}
	update_max_fd(fd);
	outcall_conn.fd = fd;
	return(0);
}

void
outbound_mo_setup(call, msg)
	struct gsm_call *call;
	struct gsm_mncc *msg;
{
	int rc;

	rc = connect_outcall_socket();
	if (rc < 0) {
		syslog(LOG_ERR, "rejecting MO call 0x%x: outbound gateway down",
			msg->callref);
		reject_mo_call(msg->callref, GSM48_CAUSE_LOC_PRN_S_LU,
				GSM48_CC_CAUSE_DEST_OOO);
		call->gc_flag = 1;
		return;
	}
	call->socket = &outcall_conn;
	call->socket_ref = msg->callref;
	outcall_conn.ncalls++;
	mncc_signal_to_socket(call, msg);
}