226 lines
5.3 KiB
C
226 lines
5.3 KiB
C
/* Command line utility to create GTP link */
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/* (C) 2014 by sysmocom - s.f.m.c. GmbH
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* (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* Author: Pablo Neira Ayuso <pablo@gnumonks.org>
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*
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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 2 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 Affero 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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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <libmnl/libmnl.h>
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#include <linux/if.h>
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#include <linux/if_link.h>
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#include <linux/rtnetlink.h>
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#include <linux/gtp.h>
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#include <linux/if_link.h>
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#include <libgtpnl/gtpnl.h>
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#include <errno.h>
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struct gtp_server_sock {
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int family;
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int fd1;
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int fd2;
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socklen_t len;
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struct {
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union {
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struct sockaddr_in in;
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struct sockaddr_in6 in6;
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} fd1;
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union {
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struct sockaddr_in in;
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struct sockaddr_in6 in6;
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} fd2;
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} sockaddr;
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union {
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struct in_addr v4;
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struct in6_addr v6;
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} addr;
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};
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static void setup_sockaddr_in(struct sockaddr_in *sockaddr, struct in_addr *in,
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uint16_t port)
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{
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sockaddr->sin_family = AF_INET;
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sockaddr->sin_port = htons(port);
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sockaddr->sin_addr = *in;
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}
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static void setup_sockaddr_in6(struct sockaddr_in6 *sockaddr, struct in6_addr *in6,
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uint16_t port)
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{
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sockaddr->sin6_family = AF_INET6;
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sockaddr->sin6_port = htons(port);
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sockaddr->sin6_addr = *in6;
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}
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static int setup_socket(struct gtp_server_sock *gtp_sock, int family)
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{
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int fd1 = socket(family, SOCK_DGRAM, 0);
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int fd2 = socket(family, SOCK_DGRAM, 0);
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int one = 1;
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if (fd1 < 0 || fd2 < 0)
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return -1;
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gtp_sock->family = family;
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gtp_sock->fd1 = fd1;
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gtp_sock->fd2 = fd2;
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switch (family) {
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case AF_INET:
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gtp_sock->len = sizeof(struct sockaddr_in);
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setup_sockaddr_in(>p_sock->sockaddr.fd1.in,
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>p_sock->addr.v4, 3386);
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setup_sockaddr_in(>p_sock->sockaddr.fd2.in,
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>p_sock->addr.v4, 2152);
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break;
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case AF_INET6:
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gtp_sock->len = sizeof(struct sockaddr_in6);
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setup_sockaddr_in6(>p_sock->sockaddr.fd1.in6,
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>p_sock->addr.v6, 3386);
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setup_sockaddr_in6(>p_sock->sockaddr.fd2.in6,
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>p_sock->addr.v6, 2152);
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if (setsockopt(fd1, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)) < 0)
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perror("setsockopt IPV6_V6ONLY: ");
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if (setsockopt(fd2, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)) < 0)
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perror("setsockopt IPV6_V6ONLY: ");
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break;
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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char buf[MNL_SOCKET_BUFFER_SIZE];
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struct gtp_server_sock gtp_sock;
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int ret, sgsn_mode = 0, family;
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const char *addr = NULL;
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memset(>p_sock, 0, sizeof(gtp_sock));
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if (argc < 3) {
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printf("Usage: %s add <device> <family> [--sgsn] [<address>]\n", argv[0]);
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printf(" %s del <device>\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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if (!strcmp(argv[1], "del")) {
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printf("destroying gtp interface...\n");
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if (gtp_dev_destroy(argv[2]) < 0)
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perror("gtp_dev_destroy");
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return 0;
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} else if (!strcmp(argv[1], "add")) {
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if (argc < 4) {
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printf("Usage: %s add <device> <family> [--sgsn] [<address>]\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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if (argc == 5) {
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if (!strcmp(argv[4], "--sgsn"))
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sgsn_mode = 1;
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else
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addr = argv[4];
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}
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if (argc == 6) {
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if (!strcmp(argv[4], "--sgsn"))
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sgsn_mode = 1;
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addr = argv[5];
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}
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}
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if (!strcmp(argv[3], "ip"))
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family = AF_INET;
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else if (!strcmp(argv[3], "ip6"))
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family = AF_INET6;
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else {
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fprintf(stderr, "unsupport family `%s', expecting `ip' or `ip6'\n",
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argv[3]);
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exit(EXIT_FAILURE);
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}
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if (addr) {
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if (!inet_pton(family, addr, >p_sock.addr)) {
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fprintf(stderr, "invalid listener address: %s\n",
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strerror(errno));
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exit(EXIT_FAILURE);
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}
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} else {
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switch (family) {
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case AF_INET:
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gtp_sock.addr.v4.s_addr = INADDR_ANY;
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break;
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case AF_INET6:
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gtp_sock.addr.v6 = in6addr_any;
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break;
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}
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}
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if (setup_socket(>p_sock, family) < 0) {
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perror("socket");
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exit(EXIT_FAILURE);
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}
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if (bind(gtp_sock.fd1, (struct sockaddr *) >p_sock.sockaddr.fd1, gtp_sock.len) < 0) {
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perror("bind");
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exit(EXIT_FAILURE);
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}
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if (bind(gtp_sock.fd2, (struct sockaddr *) >p_sock.sockaddr.fd2, gtp_sock.len) < 0) {
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perror("bind");
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exit(EXIT_FAILURE);
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}
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if (sgsn_mode)
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ret = gtp_dev_create_sgsn(-1, argv[2], gtp_sock.fd1, gtp_sock.fd2);
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else
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ret = gtp_dev_create(-1, argv[2], gtp_sock.fd1, gtp_sock.fd2);
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if (ret < 0) {
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perror("cannot create GTP device\n");
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exit(EXIT_FAILURE);
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}
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fprintf(stderr, "WARNING: attaching dummy socket descriptors. Keep "
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"this process running for testing purposes.\n");
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while (1) {
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union {
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struct sockaddr_in addr;
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struct sockaddr_in6 addr6;
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} sock;
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ret = recvfrom(gtp_sock.fd1, buf, sizeof(buf), 0,
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(struct sockaddr *)&sock, >p_sock.len);
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printf("received %d bytes via UDP socket\n", ret);
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}
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return 0;
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}
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