1 /*
2 * Copyright (C) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15 #include "securec.h"
16 #include "sendmsg.h"
17 #include "log.h"
18 #include <sys/socket.h>
19 #include <cstring>
20 #include <alloca.h>
21 #include <unistd.h>
22 #include <cerrno>
23 #include <cstdio>
24
25 namespace Hdc {
26
SendMsg(int socketFd,int fd,char * data,int size)27 extern "C" int SendMsg(int socketFd, int fd, char* data, int size)
28 {
29 constexpr int memcpyError = -2;
30 constexpr int cmsgNullptrError = -5;
31 struct iovec iov;
32 iov.iov_base = data;
33 iov.iov_len = size;
34 struct msghdr msg;
35 msg.msg_name = nullptr;
36 msg.msg_namelen = 0;
37 msg.msg_iov = &iov;
38 msg.msg_iovlen = 1;
39
40 int len = CMSG_SPACE(static_cast<unsigned int>(sizeof(int)));
41 char ctlBuf[len];
42 msg.msg_control = ctlBuf;
43 msg.msg_controllen = sizeof(ctlBuf);
44
45 struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
46 if (cmsg == nullptr) {
47 WRITE_LOG(LOG_WARN, "SendFdToApp cmsg is nullptr\n");
48 return cmsgNullptrError;
49 }
50 cmsg->cmsg_level = SOL_SOCKET;
51 cmsg->cmsg_type = SCM_RIGHTS;
52 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
53 int result = -1;
54 if (memcpy_s(CMSG_DATA(cmsg), sizeof(int), &fd, sizeof(int)) != EOK) {
55 WRITE_LOG(LOG_WARN, "SendFdToApp memcpy_s error:%d\n", errno);
56 return memcpyError;
57 }
58 if ((result = sendmsg(socketFd, &msg, 0)) < 0) {
59 WRITE_LOG(LOG_WARN, "SendFdToApp sendmsg errno:%d, result:%d\n", errno, result);
60 return result;
61 }
62 WRITE_LOG(LOG_INFO, "send msg ok\n");
63 return result;
64 }
65 }