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/* Mobie Network Call Control (MNCC) socket handling
*
* (C) 2016 by Andreas Eversberg <jolly@eversberg.eu>
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stddef.h>
#include <unistd.h>
#include "sample.h"
#include "debug.h"
#include "call.h"
#include "mncc_sock.h"
static int listen_sock = -1;
static int mncc_sock = -1;
/* write to mncc socket, return error or -EIO if no socket connection */
int mncc_write(uint8_t *buf, int length)
{
int rc;
if (mncc_sock <= 0) {
PDEBUG(DMNCC, DEBUG_NOTICE, "MNCC not connected.\n");
return -EIO;
}
rc = send(mncc_sock, buf, length, 0);
if (rc < 0) {
PDEBUG(DMNCC, DEBUG_ERROR, "MNCC connection failed (errno = %d).\n", errno);
mncc_sock_close();
return 0;
}
if (rc != length) {
PDEBUG(DMNCC, DEBUG_NOTICE, "MNCC write failed.\n");
mncc_sock_close();
return 0;
}
return rc;
}
/* read from mncc socket */
static int mncc_read(void)
{
uint8_t buf[sizeof(struct gsm_mncc)+1024];
int rc;
memset(buf, 0, sizeof(buf));
rc = recv(mncc_sock, buf, sizeof(buf), 0);
if (rc == 0) {
PDEBUG(DMNCC, DEBUG_NOTICE, "MNCC connection closed.\n");
mncc_sock_close();
return 0;
}
if (rc < 0) {
if (errno == EWOULDBLOCK)
return -errno;
PDEBUG(DMNCC, DEBUG_ERROR, "MNCC connection failed (errno = %d).\n", errno);
mncc_sock_close();
return -errno;
}
call_mncc_recv(buf, rc);
return rc;
}
static void mncc_hello(void)
{
struct gsm_mncc_hello hello;
memset(&hello, 0, sizeof(hello));
hello.msg_type = MNCC_SOCKET_HELLO;
hello.version = MNCC_SOCK_VERSION;
hello.mncc_size = sizeof(struct gsm_mncc);
hello.data_frame_size = sizeof(struct gsm_data_frame);
hello.called_offset = offsetof(struct gsm_mncc, called);
hello.signal_offset = offsetof(struct gsm_mncc, signal);
hello.emergency_offset = offsetof(struct gsm_mncc, emergency);
hello.lchan_type_offset = offsetof(struct gsm_mncc, lchan_type);
mncc_write((uint8_t *) &hello, sizeof(hello));
}
static int mncc_accept(void)
{
struct sockaddr_un __attribute__((__unused__)) un_addr;
socklen_t __attribute__((__unused__)) len;
int flags;
int rc;
len = sizeof(un_addr);
rc = accept(listen_sock, (struct sockaddr *) &un_addr, &len);
if (rc < 0) {
if (errno == EWOULDBLOCK)
return 0;
PDEBUG(DMNCC, DEBUG_ERROR, "Failed to accept incoming connection (errno=%d).\n", errno);
return rc;
}
if (mncc_sock > 0) {
PDEBUG(DMNCC, DEBUG_NOTICE, "Rejecting multiple incoming connections.\n");
close(rc);
return -EIO;
}
mncc_sock = rc;
flags = fcntl(mncc_sock, F_GETFL, 0);
rc = fcntl(mncc_sock, F_SETFL, flags | O_NONBLOCK);
if (rc < 0) {
PDEBUG(DMNCC, DEBUG_ERROR, "Failed to set socket into non-blocking IO mode.\n");
mncc_sock_close();
return rc;
}
PDEBUG(DMNCC, DEBUG_NOTICE, "MNCC socket connected.\n");
mncc_hello();
return 1;
}
void mncc_handle(void)
{
mncc_accept();
if (mncc_sock > 0) {
while ((mncc_read()) > 0)
;
}
}
void mncc_sock_close(void)
{
if (mncc_sock > 0) {
PDEBUG(DMNCC, DEBUG_NOTICE, "MNCC socket disconnected.\n");
close(mncc_sock);
mncc_sock = -1;
/* clear all call instances */
call_mncc_flush();
}
}
int mncc_init(const char *sock_name)
{
struct sockaddr_un local;
unsigned int namelen;
int flags;
int rc;
listen_sock = socket(PF_UNIX, SOCK_SEQPACKET, 0);
if (listen_sock < 0) {
PDEBUG(DMNCC, DEBUG_ERROR, "Failed to create socket.\n");
return listen_sock;
}
local.sun_family = AF_UNIX;
strncpy(local.sun_path, sock_name, sizeof(local.sun_path));
local.sun_path[sizeof(local.sun_path) - 1] = '\0';
unlink(local.sun_path);
/* we use the same magic that X11 uses in Xtranssock.c for
* calculating the proper length of the sockaddr */
#if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
local.sun_len = strlen(local.sun_path);
#endif
#if defined(BSD44SOCKETS) || defined(SUN_LEN)
namelen = SUN_LEN(&local);
#else
namelen = strlen(local.sun_path) +
offsetof(struct sockaddr_un, sun_path);
#endif
rc = bind(listen_sock, (struct sockaddr *) &local, namelen);
if (rc < 0) {
PDEBUG(DMNCC, DEBUG_ERROR, "Failed to bind the unix domain "
"socket. '%s'\n", local.sun_path);
mncc_exit();
return rc;
}
rc = listen(listen_sock, 0);
if (rc < 0) {
PDEBUG(DMNCC, DEBUG_ERROR, "Failed to listen.\n");
mncc_exit();
return rc;
}
flags = fcntl(listen_sock, F_GETFL, 0);
flags = 0;
rc = fcntl(listen_sock, F_SETFL, flags | O_NONBLOCK);
if (rc < 0) {
PDEBUG(DMNCC, DEBUG_ERROR, "Failed to set socket into non-blocking IO mode.\n");
mncc_exit();
return rc;
}
PDEBUG(DMNCC, DEBUG_DEBUG, "MNCC socket at '%s' initialized, waiting for connection.\n", sock_name);
return 0;
}
void mncc_exit(void)
{
mncc_sock_close();
if (listen_sock > 0) {
close(listen_sock);
listen_sock = -1;
}
PDEBUG(DMNCC, DEBUG_DEBUG, "MNCC socket removed.\n");
}
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