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 25namespace Hdc { 26 27extern "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 = static_cast<size_t>(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}