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/* SPDX-License-Identifier: LGPL-2.1-only */
#include "nl-default.h"
#include <signal.h>
#include <sys/time.h>
#include <time.h>
#include <linux/netlink.h>
#include <netlink/netlink.h>
#include <netlink/cache.h>
#include <netlink/cli/utils.h>
static int quit = 0;
static int change = 1;
static int print_ts = 0;
static struct nl_dump_params params = {
.dp_type = NL_DUMP_LINE,
};
static void print_timestamp(FILE *fp)
{
struct timeval tv;
char tshort[40];
struct tm *tm;
struct tm tm_buf;
gettimeofday(&tv, NULL);
tm = localtime_r(&tv.tv_sec, &tm_buf);
strftime(tshort, sizeof(tshort), "%Y-%m-%dT%H:%M:%S", tm);
fprintf(fp, "[%s.%06ld] ", tshort, tv.tv_usec);
}
static void change_cb(struct nl_cache *cache, struct nl_object *obj,
int action, void *data)
{
if (print_ts)
print_timestamp(stdout);
if (action == NL_ACT_NEW)
printf("NEW ");
else if (action == NL_ACT_DEL)
printf("DEL ");
else if (action == NL_ACT_CHANGE)
printf("CHANGE ");
nl_object_dump(obj, ¶ms);
fflush(stdout);
change = 1;
}
static void sigint(int arg)
{
quit = 1;
}
static void print_usage(FILE* stream, const char *name)
{
fprintf(stream,
"Usage: %s [OPTIONS]... <cache name>... \n"
"\n"
"OPTIONS\n"
" -f, --format=TYPE Output format { brief | details | stats }\n"
" Default: brief\n"
" -d, --dump Dump cache content after a change.\n"
" -i, --interval=TIME Dump cache content after TIME seconds when there is no\n"
" change; 0 to disable. Default: 1\n"
" -I, --iter Iterate over all address families when updating caches.\n"
" -t, --tshort Print a short timestamp before change messages.\n"
" -h, --help Show this help text.\n"
, name);
}
int main(int argc, char *argv[])
{
bool dump_on_change = false, dump_on_timeout = true, iter = false;
struct nl_cache_mngr *mngr;
int timeout = 1000, err;
for (;;) {
static struct option long_opts[] = {
{ "format", required_argument, 0, 'f' },
{ "dump", no_argument, 0, 'd' },
{ "interval", required_argument, 0, 'i' },
{ "iter", no_argument, 0, 'I' },
{ "tshort", no_argument, 0, 't' },
{ "help", 0, 0, 'h' },
{ 0, 0, 0, 0 }
};
int c;
c = getopt_long(argc, argv, "hf:di:It", long_opts, NULL);
if (c == -1)
break;
switch (c) {
char *endptr;
long interval;
case 'f':
params.dp_type = nl_cli_parse_dumptype(optarg);
break;
case 'd':
dump_on_change = true;
break;
case 'i':
errno = 0;
interval = strtol(optarg, &endptr, 0);
if (interval < 0 || errno || *endptr) {
nl_cli_fatal(EINVAL, "Invalid interval \"%s\".\n",
optarg);
exit(1);
}
if (!interval) {
dump_on_timeout = false;
} else {
timeout = interval * 1000;
}
break;
case 'I':
iter = true;
break;
case 't':
print_ts = true;
break;
case 'h':
print_usage(stdout, argv[0]);
exit(0);
case '?':
print_usage(stderr, argv[0]);
exit(1);
}
}
err = nl_cache_mngr_alloc(NULL, NETLINK_ROUTE, NL_AUTO_PROVIDE, &mngr);
if (err < 0)
nl_cli_fatal(err, "Unable to allocate cache manager: %s",
nl_geterror(err));
while (optind < argc) {
struct nl_cache *cache;
err = nl_cache_alloc_name(argv[optind], &cache);
if (err < 0)
nl_cli_fatal(err, "Couldn't add cache %s: %s\n",
argv[optind], nl_geterror(err));
if (iter)
nl_cache_set_flags(cache, NL_CACHE_AF_ITER);
err = nl_cache_mngr_add_cache(mngr, cache, &change_cb, NULL);
if (err < 0)
nl_cli_fatal(err, "Unable to add cache %s: %s",
argv[optind], nl_geterror(err));
optind++;
}
params.dp_fd = stdout;
signal(SIGINT, sigint);
while (!quit) {
err = nl_cache_mngr_poll(mngr, timeout);
if (err < 0 && err != -NLE_INTR)
nl_cli_fatal(err, "Polling failed: %s", nl_geterror(err));
if (dump_on_timeout || (dump_on_change && change)) {
nl_cache_mngr_info(mngr, ¶ms);
fflush(stdout);
change = 0;
}
}
nl_cache_mngr_free(mngr);
return 0;
}
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