/*

 * Copyright (C) 2023 Huawei Device Co., Ltd.

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include "securec.h"

#include "sendmsg.h"

#include "log.h"

#include <sys/socket.h>

#include <cstring>

#include <alloca.h>

#include <unistd.h>

#include <cerrno>

#include <cstdio>



namespace Hdc {



extern "C" int SendMsg(int socketFd, int fd, char* data, int size)

{

    constexpr int memcpyError = -2;

    constexpr int cmsgNullptrError = -5;

    struct iovec iov;

    iov.iov_base = data;

    iov.iov_len = static_cast<size_t>(size);

    struct msghdr msg;

    msg.msg_name = nullptr;

    msg.msg_namelen = 0;

    msg.msg_iov = &iov;

    msg.msg_iovlen = 1;



    int len = CMSG_SPACE(static_cast<unsigned int>(sizeof(int)));

    char ctlBuf[len];

    msg.msg_control = ctlBuf;

    msg.msg_controllen = sizeof(ctlBuf);



    struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);

    if (cmsg == nullptr) {

        WRITE_LOG(LOG_WARN, "SendFdToApp cmsg is nullptr\n");

        return cmsgNullptrError;

    }

    cmsg->cmsg_level = SOL_SOCKET;

    cmsg->cmsg_type = SCM_RIGHTS;

    cmsg->cmsg_len = CMSG_LEN(sizeof(int));

    int result = -1;

    if (memcpy_s(CMSG_DATA(cmsg), sizeof(int), &fd, sizeof(int)) != EOK) {

        WRITE_LOG(LOG_WARN, "SendFdToApp memcpy_s error:%d\n", errno);

        return memcpyError;

    }

    if ((result = sendmsg(socketFd, &msg, 0)) < 0) {

        WRITE_LOG(LOG_WARN, "SendFdToApp sendmsg errno:%d, result:%d\n", errno, result);

        return result;

    }

    WRITE_LOG(LOG_INFO, "send msg ok\n");

    return result;

}

}