240 lines
5.6 KiB
C
240 lines
5.6 KiB
C
/* Mobie Network Call Control (MNCC) socket handling
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*
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* (C) 2016 by Andreas Eversberg <jolly@eversberg.eu>
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* All Rights Reserved
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <stddef.h>
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#include <unistd.h>
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#include "../libsample/sample.h"
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#include "../libdebug/debug.h"
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#include "../libmobile/call.h"
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#include "cause.h"
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#include "mncc_sock.h"
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static int listen_sock = -1;
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static int mncc_sock = -1;
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/* write to mncc socket, return error or -EIO if no socket connection */
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static int mncc_write(uint8_t *buf, int length)
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{
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int rc;
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if (mncc_sock <= 0) {
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PDEBUG(DMNCC, DEBUG_NOTICE, "We have no MNCC connection, rejecting.\n");
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return -CAUSE_TEMPFAIL;
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}
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rc = send(mncc_sock, buf, length, 0);
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if (rc < 0) {
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PDEBUG(DMNCC, DEBUG_ERROR, "MNCC connection failed (errno = %d).\n", errno);
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mncc_sock_close();
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return -CAUSE_TEMPFAIL;
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}
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if (rc != length) {
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PDEBUG(DMNCC, DEBUG_NOTICE, "MNCC write failed.\n");
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mncc_sock_close();
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return -CAUSE_TEMPFAIL;
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}
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return 0;
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}
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/* read from mncc socket */
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static int mncc_read(void)
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{
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uint8_t buf[sizeof(struct gsm_mncc)+1024];
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int rc;
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memset(buf, 0, sizeof(buf));
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rc = recv(mncc_sock, buf, sizeof(buf), 0);
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if (rc == 0) {
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PDEBUG(DMNCC, DEBUG_NOTICE, "MNCC connection closed.\n");
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mncc_sock_close();
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return 0;
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}
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if (rc < 0) {
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if (errno == EWOULDBLOCK)
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return -errno;
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PDEBUG(DMNCC, DEBUG_ERROR, "MNCC connection failed (errno = %d).\n", errno);
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mncc_sock_close();
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return -errno;
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}
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mncc_down(buf, rc);
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return rc;
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}
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static void mncc_hello(void)
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{
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struct gsm_mncc_hello hello;
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memset(&hello, 0, sizeof(hello));
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hello.msg_type = MNCC_SOCKET_HELLO;
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hello.version = MNCC_SOCK_VERSION;
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hello.mncc_size = sizeof(struct gsm_mncc);
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hello.data_frame_size = sizeof(struct gsm_data_frame);
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hello.called_offset = offsetof(struct gsm_mncc, called);
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hello.signal_offset = offsetof(struct gsm_mncc, signal);
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hello.emergency_offset = offsetof(struct gsm_mncc, emergency);
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hello.lchan_type_offset = offsetof(struct gsm_mncc, lchan_type);
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mncc_write((uint8_t *) &hello, sizeof(hello));
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}
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static int mncc_accept(void)
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{
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struct sockaddr_un __attribute__((__unused__)) un_addr;
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socklen_t __attribute__((__unused__)) len;
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int flags;
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int rc;
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len = sizeof(un_addr);
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rc = accept(listen_sock, (struct sockaddr *) &un_addr, &len);
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if (rc < 0) {
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if (errno == EWOULDBLOCK)
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return 0;
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PDEBUG(DMNCC, DEBUG_ERROR, "Failed to accept incoming connection (errno=%d).\n", errno);
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return rc;
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}
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if (mncc_sock > 0) {
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PDEBUG(DMNCC, DEBUG_NOTICE, "Rejecting multiple incoming connections.\n");
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close(rc);
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return -EIO;
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}
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mncc_sock = rc;
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flags = fcntl(mncc_sock, F_GETFL, 0);
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rc = fcntl(mncc_sock, F_SETFL, flags | O_NONBLOCK);
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if (rc < 0) {
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PDEBUG(DMNCC, DEBUG_ERROR, "Failed to set socket into non-blocking IO mode.\n");
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mncc_sock_close();
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return rc;
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}
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PDEBUG(DMNCC, DEBUG_NOTICE, "MNCC socket connected.\n");
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mncc_hello();
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return 1;
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}
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void mncc_sock_handle(void)
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{
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mncc_accept();
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if (mncc_sock > 0) {
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while ((mncc_read()) > 0)
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;
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}
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}
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void mncc_sock_close(void)
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{
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if (mncc_sock > 0) {
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PDEBUG(DMNCC, DEBUG_NOTICE, "MNCC socket disconnected.\n");
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close(mncc_sock);
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mncc_sock = -1;
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/* clear all call instances */
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mncc_flush();
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}
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}
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int mncc_sock_init(const char *sock_name)
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{
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struct sockaddr_un local;
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unsigned int namelen;
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int flags;
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int rc;
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listen_sock = socket(PF_UNIX, SOCK_SEQPACKET, 0);
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if (listen_sock < 0) {
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PDEBUG(DMNCC, DEBUG_ERROR, "Failed to create socket.\n");
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return listen_sock;
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}
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local.sun_family = AF_UNIX;
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strncpy(local.sun_path, sock_name, sizeof(local.sun_path));
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local.sun_path[sizeof(local.sun_path) - 1] = '\0';
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unlink(local.sun_path);
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/* we use the same magic that X11 uses in Xtranssock.c for
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* calculating the proper length of the sockaddr */
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#if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
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local.sun_len = strlen(local.sun_path);
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#endif
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#if defined(BSD44SOCKETS) || defined(SUN_LEN)
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namelen = SUN_LEN(&local);
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#else
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namelen = strlen(local.sun_path) +
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offsetof(struct sockaddr_un, sun_path);
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#endif
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rc = bind(listen_sock, (struct sockaddr *) &local, namelen);
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if (rc < 0) {
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PDEBUG(DMNCC, DEBUG_ERROR, "Failed to bind the unix domain "
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"socket. '%s'\n", local.sun_path);
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mncc_sock_exit();
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return rc;
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}
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rc = listen(listen_sock, 0);
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if (rc < 0) {
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PDEBUG(DMNCC, DEBUG_ERROR, "Failed to listen.\n");
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mncc_sock_exit();
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return rc;
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}
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flags = fcntl(listen_sock, F_GETFL, 0);
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flags = 0;
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rc = fcntl(listen_sock, F_SETFL, flags | O_NONBLOCK);
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if (rc < 0) {
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PDEBUG(DMNCC, DEBUG_ERROR, "Failed to set socket into non-blocking IO mode.\n");
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mncc_sock_exit();
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return rc;
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}
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mncc_up = mncc_write;
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PDEBUG(DMNCC, DEBUG_DEBUG, "MNCC socket at '%s' initialized, waiting for connection.\n", sock_name);
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return 0;
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}
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void mncc_sock_exit(void)
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{
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mncc_sock_close();
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if (listen_sock > 0) {
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close(listen_sock);
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listen_sock = -1;
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}
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PDEBUG(DMNCC, DEBUG_DEBUG, "MNCC socket removed.\n");
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}
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