133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/* $OpenBSD: privsep_fdpass.c,v 1.8 2014/11/18 20:51:00 krw Exp $ */
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/*
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* Copyright 2001 Niels Provos <provos@citi.umich.edu>
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* All rights reserved.
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*
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* Copyright (c) 2002 Matthieu Herrb
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "pflogd.h"
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void
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send_fd(int sock, int fd)
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{
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struct msghdr msg;
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union {
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struct cmsghdr hdr;
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char buf[CMSG_SPACE(sizeof(int))];
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} cmsgbuf;
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struct cmsghdr *cmsg;
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struct iovec vec;
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int result = 0;
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ssize_t n;
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memset(&msg, 0, sizeof(msg));
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if (fd >= 0) {
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msg.msg_control = (caddr_t)&cmsgbuf.buf;
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msg.msg_controllen = sizeof(cmsgbuf.buf);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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*(int *)CMSG_DATA(cmsg) = fd;
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} else {
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result = errno;
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}
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vec.iov_base = &result;
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vec.iov_len = sizeof(int);
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msg.msg_iov = &vec;
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msg.msg_iovlen = 1;
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if ((n = sendmsg(sock, &msg, 0)) == -1)
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warn("%s: sendmsg(%d)", __func__, sock);
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if (n != sizeof(int))
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warnx("%s: sendmsg: expected sent 1 got %ld",
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__func__, (long)n);
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}
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int
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receive_fd(int sock)
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{
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struct msghdr msg;
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union {
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struct cmsghdr hdr;
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char buf[CMSG_SPACE(sizeof(int))];
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} cmsgbuf;
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struct cmsghdr *cmsg;
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struct iovec vec;
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ssize_t n;
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int result;
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int fd;
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memset(&msg, 0, sizeof(msg));
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vec.iov_base = &result;
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vec.iov_len = sizeof(int);
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msg.msg_iov = &vec;
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msg.msg_iovlen = 1;
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msg.msg_control = &cmsgbuf.buf;
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msg.msg_controllen = sizeof(cmsgbuf.buf);
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if ((n = recvmsg(sock, &msg, 0)) == -1) {
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warn("%s: recvmsg", __func__);
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return -1;
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}
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if (n != sizeof(int))
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warnx("%s: recvmsg: expected received 1 got %ld",
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__func__, (long)n);
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if (result == 0) {
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cmsg = CMSG_FIRSTHDR(&msg);
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if (cmsg == NULL) {
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warnx("%s: no message header", __func__);
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return -1;
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}
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if (cmsg->cmsg_type != SCM_RIGHTS)
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warnx("%s: expected type %d got %d", __func__,
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SCM_RIGHTS, cmsg->cmsg_type);
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fd = (*(int *)CMSG_DATA(cmsg));
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return fd;
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} else {
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errno = result;
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return -1;
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}
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}
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