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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* genl.c "genl" utility frontend.
*
* Authors: Jamal Hadi Salim
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <dlfcn.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <errno.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h> /* until we put our own header */
#include "version.h"
#include "utils.h"
#include "genl_utils.h"
int show_stats;
int show_details;
int show_raw;
static void *BODY;
static struct genl_util *genl_list;
static int print_nofopt(struct nlmsghdr *n, void *arg)
{
fprintf((FILE *) arg, "unknown genl type ..\n");
return 0;
}
static int parse_nofopt(struct genl_util *f, int argc, char **argv)
{
if (argc) {
fprintf(stderr,
"Unknown genl \"%s\", hence option \"%s\" is unparsable\n",
f->name, *argv);
return -1;
}
return 0;
}
static struct genl_util *get_genl_kind(const char *str)
{
void *dlh;
char buf[256];
struct genl_util *f;
for (f = genl_list; f; f = f->next)
if (strcmp(f->name, str) == 0)
return f;
snprintf(buf, sizeof(buf), "%s.so", str);
dlh = dlopen(buf, RTLD_LAZY);
if (dlh == NULL) {
dlh = BODY;
if (dlh == NULL) {
dlh = BODY = dlopen(NULL, RTLD_LAZY);
if (dlh == NULL)
goto noexist;
}
}
snprintf(buf, sizeof(buf), "%s_genl_util", str);
f = dlsym(dlh, buf);
if (f == NULL)
goto noexist;
reg:
f->next = genl_list;
genl_list = f;
return f;
noexist:
f = calloc(1, sizeof(*f));
if (f) {
strncpy(f->name, str, 15);
f->parse_genlopt = parse_nofopt;
f->print_genlopt = print_nofopt;
goto reg;
}
return f;
}
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr,
"Usage: genl [ OPTIONS ] OBJECT [help] }\n"
"where OBJECT := { ctrl etc }\n"
" OPTIONS := { -s[tatistics] | -d[etails] | -r[aw] | -V[ersion] | -h[elp] }\n");
exit(-1);
}
int main(int argc, char **argv)
{
while (argc > 1) {
if (argv[1][0] != '-')
break;
if (matches(argv[1], "-stats") == 0 ||
matches(argv[1], "-statistics") == 0) {
++show_stats;
} else if (matches(argv[1], "-details") == 0) {
++show_details;
} else if (matches(argv[1], "-raw") == 0) {
++show_raw;
} else if (matches(argv[1], "-Version") == 0) {
printf("genl utility, iproute2-%s\n", version);
exit(0);
} else if (matches(argv[1], "-help") == 0) {
usage();
} else {
fprintf(stderr,
"Option \"%s\" is unknown, try \"genl -help\".\n",
argv[1]);
exit(-1);
}
argc--; argv++;
}
if (argc > 1) {
struct genl_util *a;
int ret;
a = get_genl_kind(argv[1]);
if (!a) {
fprintf(stderr, "bad genl %s\n", argv[1]);
exit(-1);
}
ret = a->parse_genlopt(a, argc-1, argv+1);
return ret;
}
usage();
}
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