1 /*
2 * Copyright (C) 2020 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 "ifreqs.h"
18
19 #include "common.h"
20
21 #include <android-base/logging.h>
22 #include <android-base/unique_fd.h>
23
24 #include <map>
25
26 namespace android::netdevice::ifreqs {
27
28 static constexpr int defaultSocketDomain = AF_INET;
29 std::atomic_int socketDomain = defaultSocketDomain;
30
31 struct SocketParams {
32 int domain;
33 int type;
34 int protocol;
35 };
36
37 static const std::map<int, SocketParams> socketParams = {
38 {AF_INET, {AF_INET, SOCK_DGRAM, 0}},
39 {AF_CAN, {AF_CAN, SOCK_RAW, CAN_RAW}},
40 };
41
getSocketParams(int domain)42 static SocketParams getSocketParams(int domain) {
43 if (socketParams.count(domain)) return socketParams.find(domain)->second;
44
45 auto params = socketParams.find(defaultSocketDomain)->second;
46 params.domain = domain;
47 return params;
48 }
49
trySend(unsigned long request,struct ifreq & ifr)50 int trySend(unsigned long request, struct ifreq& ifr) {
51 const auto sp = getSocketParams(socketDomain);
52 base::unique_fd sock(socket(sp.domain, sp.type, sp.protocol));
53 if (!sock.ok()) {
54 LOG(ERROR) << "Can't create socket";
55 return false;
56 }
57
58 if (ioctl(sock.get(), request, &ifr) < 0) return errno;
59 return 0;
60 }
61
send(unsigned long request,struct ifreq & ifr)62 bool send(unsigned long request, struct ifreq& ifr) {
63 if (trySend(request, ifr) != 0) {
64 PLOG(ERROR) << "ioctl(" << std::hex << request << std::dec << ") failed";
65 return false;
66 }
67
68 return true;
69 }
70
fromName(const std::string & ifname)71 struct ifreq fromName(const std::string& ifname) {
72 struct ifreq ifr = {};
73 strlcpy(ifr.ifr_name, ifname.c_str(), IF_NAMESIZE);
74 return ifr;
75 }
76
77 } // namespace android::netdevice::ifreqs
78