/*      $OpenBSD: privsep_fdpass.c,v 1.11 2015/07/09 20:16:04 bluhm Exp $       */

/*
 * Copyright 2001 Niels Provos <provos@citi.umich.edu>
 * All rights reserved.
 *
 * Copyright (c) 2002 Matthieu Herrb
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *    - Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    - Redistributions in binary form must reproduce the above
 *      copyright notice, this list of conditions and the following
 *      disclaimer in the documentation and/or other materials provided
 *      with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "syslogd.h"

void
send_fd(int sock, int fd)
{
        struct msghdr msg;
        union {
                struct cmsghdr hdr;
                char buf[CMSG_SPACE(sizeof(int))];
        } cmsgbuf;
        struct cmsghdr *cmsg;
        struct iovec vec;
        int result = 0;
        ssize_t n;

        memset(&msg, 0, sizeof(msg));

        if (fd >= 0) {
                msg.msg_control = (caddr_t)&cmsgbuf.buf;
                msg.msg_controllen = sizeof(cmsgbuf.buf);
                cmsg = CMSG_FIRSTHDR(&msg);
                cmsg->cmsg_len = CMSG_LEN(sizeof(int));
                cmsg->cmsg_level = SOL_SOCKET;
                cmsg->cmsg_type = SCM_RIGHTS;
                *(int *)CMSG_DATA(cmsg) = fd;
        } else {
                result = errno;
        }

        vec.iov_base = &result;
        vec.iov_len = sizeof(int);
        msg.msg_iov = &vec;
        msg.msg_iovlen = 1;

        if ((n = sendmsg(sock, &msg, 0)) == -1)
                warn("%s: sendmsg(%d)", "send_fd", sock);
        if (n != sizeof(int))
                warnx("%s: sendmsg: expected sent 1 got %ld",
                    "send_fd", (long)n);
}

int
receive_fd(int sock)
{
        struct msghdr msg;
        union {
                struct cmsghdr hdr;
                char buf[CMSG_SPACE(sizeof(int))];
        } cmsgbuf;
        struct cmsghdr *cmsg;
        struct iovec vec;
        ssize_t n;
        int result;
        int fd;

        memset(&msg, 0, sizeof(msg));
        vec.iov_base = &result;
        vec.iov_len = sizeof(int);
        msg.msg_iov = &vec;
        msg.msg_iovlen = 1;
        msg.msg_control = &cmsgbuf.buf;
        msg.msg_controllen = sizeof(cmsgbuf.buf);

        if ((n = recvmsg(sock, &msg, 0)) == -1) {
                warn("%s: recvmsg", "receive_fd");
                /* receive message failed, but the result is in the socket */
                if (errno == EMSGSIZE)
                        recv(sock, &result, sizeof(int), MSG_DONTWAIT);
                return -1;
        }
        if (n != sizeof(int))
                warnx("%s: recvmsg: expected received 1 got %ld",
                    "receive_fd", (long)n);
        if (result == 0) {
                cmsg = CMSG_FIRSTHDR(&msg);
                if (cmsg == NULL) {
                        warnx("%s: no message header", "receive_fd");
                        return (-1);
                }
                if (cmsg->cmsg_type != SCM_RIGHTS)
                        warnx("%s: expected type %d got %d", "receive_fd",
                            SCM_RIGHTS, cmsg->cmsg_type);
                fd = (*(int *)CMSG_DATA(cmsg));
                return fd;
        } else {
                errno = result;
                return -1;
        }
}