tools: gtp-link: bind to GTP UDP sockets
So we can fully test packet decapsulation without a full blown openggsn
setup by injecting packets and using this simple tool.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/tools/gtp-link.c b/tools/gtp-link.c
index b82bd37..9c12f75 100644
--- a/tools/gtp-link.c
+++ b/tools/gtp-link.c
@@ -27,6 +27,8 @@
#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>
@@ -72,6 +74,31 @@
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);
+ }
mnl_attr_put_str(nlh, IFLA_IFNAME, argv[2]);
nest = mnl_attr_nest_start(nlh, IFLA_LINKINFO);
@@ -119,7 +146,15 @@
fprintf(stderr, "WARNING: attaching dummy socket descriptors. Keep "
"this process running for testing purposes.\n");
- pause();
+
+ 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;
}