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/* Command line utility to create GTP link */
/* (C) 2014 by sysmocom - s.f.m.c. GmbH
* (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* Author: Pablo Neira Ayuso <pablo@gnumonks.org>
*
* 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 Affero 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 <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <libmnl/libmnl.h>
#include <linux/if.h>
#include <linux/if_link.h>
#include <linux/rtnetlink.h>
#include <linux/gtp.h>
#include <linux/if_link.h>
#include <libgtpnl/gtpnl.h>
int main(int argc, char *argv[])
{
char buf[MNL_SOCKET_BUFFER_SIZE];
int ret;
if (argc != 3) {
printf("Usage: %s <add|del> <device>\n", argv[0]);
exit(EXIT_FAILURE);
}
if (!strcmp(argv[1], "del")) {
printf("destroying gtp interface...\n");
if (gtp_dev_destroy(argv[2]) < 0)
perror("gtp_dev_destroy");
return 0;
}
int fd1 = socket(AF_INET, SOCK_DGRAM, 0);
int fd2 = socket(AF_INET, SOCK_DGRAM, 0);
struct sockaddr_in sockaddr_fd1 = {
.sin_family = AF_INET,
.sin_port = htons(3386),
.sin_addr = {
.s_addr = INADDR_ANY,
},
};
struct sockaddr_in sockaddr_fd2 = {
.sin_family = AF_INET,
.sin_port = htons(2152),
.sin_addr = {
.s_addr = INADDR_ANY,
},
};
if (bind(fd1, (struct sockaddr *) &sockaddr_fd1,
sizeof(sockaddr_fd1)) < 0) {
perror("bind");
exit(EXIT_FAILURE);
}
if (bind(fd2, (struct sockaddr *) &sockaddr_fd2,
sizeof(sockaddr_fd2)) < 0) {
perror("bind");
exit(EXIT_FAILURE);
}
ret = gtp_dev_create(-1, argv[2], fd1, fd2);
if (ret < 0) {
perror("cannot create GTP device\n");
exit(EXIT_FAILURE);
}
fprintf(stderr, "WARNING: attaching dummy socket descriptors. Keep "
"this process running for testing purposes.\n");
while (1) {
struct sockaddr_in addr;
socklen_t len = sizeof(addr);
ret = recvfrom(fd1, buf, sizeof(buf), 0,
(struct sockaddr *)&addr, &len);
printf("received %d bytes via UDP socket\n", ret);
}
return 0;
}
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