1/*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "common/libs/net/netlink_client.h"
18#include "common/libs/net/network_interface.h"
19#include "common/libs/net/network_interface_manager.h"
20
21#include <net/if.h>
22#include <cstdio>
23
24// This command can only rename network interfaces that are *DOWN*
25
26int main(int argc, char *argv[]) {
27  if (argc != 3) {
28    fprintf(stderr, "usage: %s [ethA] [ethB]\n", argv[0]);
29    return -1;
30  }
31  const char *const name = argv[1];
32  int32_t index = if_nametoindex(name);
33  if (index == 0) {
34    fprintf(stderr, "%s: invalid interface name '%s'\n", argv[0], name);
35    return -2;
36  }
37  const char *const new_name = argv[2];
38  auto factory = cvd::NetlinkClientFactory::Default();
39  std::unique_ptr<cvd::NetlinkClient> nl(factory->New(NETLINK_ROUTE));
40  std::unique_ptr<cvd::NetworkInterfaceManager> nm(
41      cvd::NetworkInterfaceManager::New(factory));
42  std::unique_ptr<cvd::NetworkInterface> ni(nm->Open(new_name, name));
43  bool res = false;
44  if (ni) {
45    ni->SetName(new_name);
46    res = nm->ApplyChanges(*ni);
47  }
48  if (!res) {
49    fprintf(stderr, "%s: renaming interface '%s' failed\n", argv[0], name);
50    return -3;
51  }
52  return 0;
53}
54