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netd: add automatic detection of device files

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Matheus
2026-04-15 16:47:11 -03:00
parent 0f69e2bf2e
commit 338b448381
1 changed files with 38 additions and 7 deletions
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tools/netd/main.c
+38 -7
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@@ -134,8 +134,9 @@ static uint32_t xid;
static time_t discoverstart; static time_t discoverstart;
static void usage() { static void usage() {
fprintf(stderr, "%s: usage: %s device\n", name, name); fprintf(stderr, "%s: usage: %s [device]\n", name, name);
fprintf(stderr, "%s: example: %s vionet0\n", name, name); fprintf(stderr, "%s: example: %s vionet0\n", name, name);
fprintf(stderr, "%s: example (auto-detection): %s\n", name, name);
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
@@ -487,16 +488,41 @@ static void writedns(uint32_t dns) {
close(fd); close(fd);
} }
static void autodetect_device(char **device) {
struct if_nameindex *nameindex = if_nameindex();
if (nameindex == NULL) {
logstrerror("if_nameindex");
exit(EXIT_FAILURE);
}
for (int i = 0; nameindex[i].if_name; ++i) {
if (strcmp(nameindex[i].if_name, "lo")) {
*device = strdup(nameindex[i].if_name);
return;
}
}
logerr("no network devices found");
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[]) { int main(int argc, char *argv[]) {
name = argv[0]; name = argv[0];
if (argc != 2) if (argc > 2)
usage(); usage();
if (createsocket(argv[1])) char *device;
if (argc == 1) {
autodetect_device(&device);
} else {
device = argv[1];
}
if (createsocket(device))
return EXIT_FAILURE; return EXIT_FAILURE;
if (getdevicehwaddr(argv[1])) if (getdevicehwaddr(device))
return EXIT_FAILURE; return EXIT_FAILURE;
srand(time(NULL)); srand(time(NULL));
@@ -568,10 +594,15 @@ int main(int argc, char *argv[]) {
printoffer(&offer); printoffer(&offer);
addroute(argv[1], 0, offer.router, 0, 1); addroute(device, 0, offer.router, 0, 1);
addroute(argv[1], offer.clientip, 0, offer.netmask, 10); addroute(device, offer.clientip, 0, offer.netmask, 10);
setifip(argv[1], offer.clientip); setifip(device, offer.clientip);
writedns(offer.dns); writedns(offer.dns);
for (;;) {
// TODO send keepalive packets
sleep(1000000);
}
return EXIT_SUCCESS; return EXIT_SUCCESS;
} }