tun_t *
tun_open(struct addr *src, struct addr *dst, int mtu)
{
struct intf_entry ifent;
tun_t *tun;
char dev[128];
int i;
if (src->addr_type != ADDR_TYPE_IP || dst->addr_type != ADDR_TYPE_IP ||
src->addr_bits != IP_ADDR_BITS || dst->addr_bits != IP_ADDR_BITS) {
errno = EINVAL;
return (NULL);
}
if ((tun = calloc(1, sizeof(*tun))) == NULL)
return (NULL);
if ((tun->intf = intf_open()) == NULL)
return (tun_close(tun));
memset(&ifent, 0, sizeof(ifent));
ifent.intf_len = sizeof(ifent);
for (i = 0; i < MAX_DEVS; i++) {
snprintf(dev, sizeof(dev), "/dev/tun%d", i);
strlcpy(ifent.intf_name, dev + 5, sizeof(ifent.intf_name));
tun->save = ifent;
if ((tun->fd = open(dev, O_RDWR, 0)) != -1 &&
intf_get(tun->intf, &tun->save) == 0) {
route_t *r;
struct route_entry entry;
ifent.intf_flags = INTF_FLAG_UP|INTF_FLAG_POINTOPOINT;
ifent.intf_addr = *src;
ifent.intf_dst_addr = *dst;
ifent.intf_mtu = mtu;
if (intf_set(tun->intf, &ifent) < 0)
tun = tun_close(tun);
/* XXX - try to ensure our route got set */
if ((r = route_open()) != NULL) {
entry.route_dst = *dst;
entry.route_gw = *src;
route_add(r, &entry);
route_close(r);
}
break;
}
}
if (i == MAX_DEVS)
tun = tun_close(tun);
return (tun);
}
tun_t *
tun_close(tun_t *tun)
{
if (tun->fd > 0)
close(tun->fd);
if (tun->intf != NULL) {
/* Restore interface configuration on close. */
intf_set(tun->intf, &tun->save);
intf_close(tun->intf);
}
free(tun);
return (NULL);
}
int
intf_main(int argc, char *argv[])
{
struct intf_entry *entry;
struct addr *ap, addr;
char *cmd, buf[1024];
if (argc < 2)
usage();
cmd = argv[1];
entry = (struct intf_entry *)buf;
memset(entry, 0, sizeof(*entry));
entry->intf_len = sizeof(buf);
if ((intf = intf_open()) == NULL)
err(1, "intf_open");
if (strcmp(cmd, "show") == 0) {
if (intf_loop(intf, print_intf, NULL) < 0)
err(1, "intf_loop");
} else if (strcmp(cmd, "get") == 0) {
if (argc < 3)
usage();
strlcpy(entry->intf_name, argv[2], sizeof(entry->intf_name));
if (intf_get(intf, entry) < 0)
err(1, "intf_get");
print_intf(entry, NULL);
} else if (strcmp(cmd, "src") == 0) {
if (argc < 3 || addr_aton(argv[2], &addr) < 0)
usage();
if (intf_get_src(intf, entry, &addr) < 0)
err(1, "intf_get_src");
print_intf(entry, NULL);
} else if (strcmp(cmd, "dst") == 0) {
if (argc < 3 || addr_aton(argv[2], &addr) < 0)
usage();
if (intf_get_dst(intf, entry, &addr) < 0)
err(1, "intf_get_dst");
print_intf(entry, NULL);
} else if (strcmp(cmd, "set") == 0) {
if (argc < 4)
usage();
strlcpy(entry->intf_name, argv[2], sizeof(entry->intf_name));
for (argv += 3, argc -= 3; argc > 1; argv += 2, argc -= 2) {
if (strcmp(argv[0], "alias") == 0) {
ap = &entry->intf_alias_addrs
[entry->intf_alias_num++];
} else if (strcmp(argv[0], "dst") == 0) {
ap = &entry->intf_dst_addr;
} else if (strcmp(argv[0], "inet") == 0) {
ap = &entry->intf_addr;
} else if (strcmp(argv[0], "link") == 0) {
ap = &entry->intf_link_addr;
} else
break;
if (addr_pton(argv[1], ap) < 0)
err(1, "invalid address: %s", argv[1]);
}
for ( ; argc > 0; argv++, argc--) {
if (strcmp(argv[0], "up") == 0)
entry->intf_flags |= INTF_FLAG_UP;
else if (strcmp(argv[0], "down") == 0)
entry->intf_flags &= ~INTF_FLAG_UP;
else if (strcmp(argv[0], "arp") == 0)
entry->intf_flags &= ~INTF_FLAG_NOARP;
else if (strcmp(argv[0], "noarp") == 0)
entry->intf_flags |= INTF_FLAG_NOARP;
else
usage();
}
if (intf_set(intf, entry) < 0)
err(1, "intf_set");
} else
usage();
intf_close(intf);
exit(0);
}
