1 /* $OpenBSD: monitor_fdpass.c,v 1.17 2008/03/24 16:11:07 deraadt Exp $ */
3 * Copyright 2001 Niels Provos <provos@citi.umich.edu>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/types.h>
30 #include <sys/socket.h>
41 #include "monitor_fdpass.h"
44 mm_send_fd(int sock, int fd)
46 #if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
51 #ifndef HAVE_ACCRIGHTS_IN_MSGHDR
54 char tmp[CMSG_SPACE(sizeof(int))];
55 char buf[CMSG_SPACE(sizeof(int))];
60 memset(&msg, 0, sizeof(msg));
61 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
62 msg.msg_accrights = (caddr_t)&fd;
63 msg.msg_accrightslen = sizeof(fd);
65 msg.msg_control = (caddr_t)&cmsgbuf.buf;
66 msg.msg_controllen = sizeof(cmsgbuf.buf);
67 cmsg = CMSG_FIRSTHDR(&msg);
68 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
69 cmsg->cmsg_level = SOL_SOCKET;
70 cmsg->cmsg_type = SCM_RIGHTS;
71 *(int *)CMSG_DATA(cmsg) = fd;
79 if ((n = sendmsg(sock, &msg, 0)) == -1) {
80 error("%s: sendmsg(%d): %s", __func__, fd,
86 error("%s: sendmsg: expected sent 1 got %ld",
92 error("%s: file descriptor passing not supported", __func__);
98 mm_receive_fd(int sock)
100 #if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
106 #ifndef HAVE_ACCRIGHTS_IN_MSGHDR
109 char buf[CMSG_SPACE(sizeof(int))];
111 struct cmsghdr *cmsg;
114 memset(&msg, 0, sizeof(msg));
119 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
120 msg.msg_accrights = (caddr_t)&fd;
121 msg.msg_accrightslen = sizeof(fd);
123 msg.msg_control = &cmsgbuf.buf;
124 msg.msg_controllen = sizeof(cmsgbuf.buf);
127 if ((n = recvmsg(sock, &msg, 0)) == -1) {
128 error("%s: recvmsg: %s", __func__, strerror(errno));
132 error("%s: recvmsg: expected received 1 got %ld",
137 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
138 if (msg.msg_accrightslen != sizeof(fd)) {
139 error("%s: no fd", __func__);
143 cmsg = CMSG_FIRSTHDR(&msg);
145 error("%s: no message header", __func__);
148 #ifndef BROKEN_CMSG_TYPE
149 if (cmsg->cmsg_type != SCM_RIGHTS) {
150 error("%s: expected type %d got %d", __func__,
151 SCM_RIGHTS, cmsg->cmsg_type);
155 fd = (*(int *)CMSG_DATA(cmsg));
159 error("%s: file descriptor passing not supported", __func__);