2 * Copyright (C) 2014 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #include "FwmarkClient.h"
21 #include <sys/socket.h>
27 const sockaddr_un FWMARK_SERVER_PATH = {AF_UNIX, "/dev/socket/fwmarkd"};
31 bool FwmarkClient::shouldSetFwmark(int family) {
32 return (family == AF_INET || family == AF_INET6) && !getenv("ANDROID_NO_USE_FWMARK_CLIENT");
35 FwmarkClient::FwmarkClient() : mChannel(-1) {
38 FwmarkClient::~FwmarkClient() {
44 int FwmarkClient::send(void* data, size_t len, int fd) {
45 mChannel = socket(AF_UNIX, SOCK_STREAM, 0);
50 if (TEMP_FAILURE_RETRY(connect(mChannel, reinterpret_cast<const sockaddr*>(&FWMARK_SERVER_PATH),
51 sizeof(FWMARK_SERVER_PATH))) == -1) {
52 // If we are unable to connect to the fwmark server, assume there's no error. This protects
53 // against future changes if the fwmark server goes away.
62 memset(&message, 0, sizeof(message));
63 message.msg_iov = &iov;
64 message.msg_iovlen = 1;
68 char cmsg[CMSG_SPACE(sizeof(fd))];
71 memset(cmsgu.cmsg, 0, sizeof(cmsgu.cmsg));
72 message.msg_control = cmsgu.cmsg;
73 message.msg_controllen = sizeof(cmsgu.cmsg);
75 cmsghdr* const cmsgh = CMSG_FIRSTHDR(&message);
76 cmsgh->cmsg_len = CMSG_LEN(sizeof(fd));
77 cmsgh->cmsg_level = SOL_SOCKET;
78 cmsgh->cmsg_type = SCM_RIGHTS;
79 memcpy(CMSG_DATA(cmsgh), &fd, sizeof(fd));
81 if (TEMP_FAILURE_RETRY(sendmsg(mChannel, &message, 0)) == -1) {
87 if (TEMP_FAILURE_RETRY(recv(mChannel, &error, sizeof(error), 0)) == -1) {