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abisip-find: add getopt option parsing in preparation for a new option 

Subsequent patch I4201876431029b303dbd10e46492228379c9782a will add the -l
cmdline option. Add getopt in a separate step here to keep the patch lean.

Change-Id: Idba1a89753510fe6d409277b20c2db86c1b8f7f8
This commit is contained in:
Neels Hofmeyr 2017-12-25 18:43:40 +01:00
parent 148ee361b3
commit 2a9ac19863
1 changed files with 55 additions and 7 deletions
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62
src/ipaccess/abisip-find.c
View File

@ -24,7 +24,7 @@
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <getopt.h>
#include <osmocom/core/select.h>
#include <osmocom/core/timer.h>
@ -32,6 +32,56 @@
#include <osmocom/gsm/ipa.h>
#include <osmocom/bsc/gsm_data.h>
static struct {
const char *ifname;
} cmdline_opts = {
.ifname = NULL,
};
static void print_help()
{
printf("\n");
printf("Usage: abisip-find [-l] [<interface-name>]\n");
printf(" <interface-name> Specify the outgoing network interface,\n"
" e.g. 'eth0'\n");
}
static void handle_options(int argc, char **argv)
{
while (1) {
int option_index = 0, c;
static struct option long_options[] = {
{"help", 0, 0, 'h'},
{0, 0, 0, 0}
};
c = getopt_long(argc, argv, "h",
long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 'h':
print_help();
exit(EXIT_SUCCESS);
default:
/* catch unknown options *as well as* missing arguments. */
fprintf(stderr, "Error in command line options. Exiting. Try --help.\n");
exit(EXIT_FAILURE);
break;
}
}
if (argc - optind > 0)
cmdline_opts.ifname = argv[optind++];
if (argc - optind > 0) {
fprintf(stderr, "Error: too many arguments\n");
print_help();
exit(EXIT_FAILURE);
}
}
static int udp_sock(const char *ifname)
{
int fd, rc, bc = 1;
@ -173,22 +223,20 @@ static void timer_cb(void *_data)
int main(int argc, char **argv)
{
struct osmo_fd bfd;
char *ifname = NULL;
int rc;
printf("abisip-find (C) 2009 by Harald Welte\n");
printf("This is FREE SOFTWARE with ABSOLUTELY NO WARRANTY\n\n");
if (argc < 2) {
handle_options(argc, argv);
if (!cmdline_opts.ifname)
fprintf(stdout, "you might need to specify the outgoing\n"
" network interface, e.g. ``%s eth0''\n", argv[0]);
} else {
ifname = argv[1];
}
bfd.cb = bfd_cb;
bfd.when = BSC_FD_READ | BSC_FD_WRITE;
bfd.fd = udp_sock(ifname);
bfd.fd = udp_sock(cmdline_opts.ifname);
if (bfd.fd < 0) {
perror("Cannot create local socket for broadcast udp");
exit(1);