1 /* $OpenBSD: monitor_fdpass.c,v 1.13 2007/09/04 03:21:03 djm 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
52 char tmp[CMSG_SPACE(sizeof(int))];
56 memset(&msg, 0, sizeof(msg));
57 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
58 msg.msg_accrights = (caddr_t)&fd;
59 msg.msg_accrightslen = sizeof(fd);
61 msg.msg_control = (caddr_t)tmp;
62 msg.msg_controllen = CMSG_LEN(sizeof(int));
63 cmsg = CMSG_FIRSTHDR(&msg);
64 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
65 cmsg->cmsg_level = SOL_SOCKET;
66 cmsg->cmsg_type = SCM_RIGHTS;
67 *(int *)CMSG_DATA(cmsg) = fd;
75 if ((n = sendmsg(sock, &msg, 0)) == -1) {
76 error("%s: sendmsg(%d): %s", __func__, fd,
82 error("%s: sendmsg: expected sent 1 got %ld",
88 error("%s: file descriptor passing not supported", __func__);
94 mm_receive_fd(int sock)
96 #if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
102 #ifndef HAVE_ACCRIGHTS_IN_MSGHDR
103 char tmp[CMSG_SPACE(sizeof(int))];
104 struct cmsghdr *cmsg;
107 memset(&msg, 0, sizeof(msg));
112 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
113 msg.msg_accrights = (caddr_t)&fd;
114 msg.msg_accrightslen = sizeof(fd);
116 msg.msg_control = tmp;
117 msg.msg_controllen = sizeof(tmp);
120 if ((n = recvmsg(sock, &msg, 0)) == -1) {
121 error("%s: recvmsg: %s", __func__, strerror(errno));
125 error("%s: recvmsg: expected received 1 got %ld",
130 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
131 if (msg.msg_accrightslen != sizeof(fd)) {
132 error("%s: no fd", __func__);
136 cmsg = CMSG_FIRSTHDR(&msg);
138 error("%s: no message header", __func__);
141 #ifndef BROKEN_CMSG_TYPE
142 if (cmsg->cmsg_type != SCM_RIGHTS) {
143 error("%s: expected type %d got %d", __func__,
144 SCM_RIGHTS, cmsg->cmsg_type);
148 fd = (*(int *)CMSG_DATA(cmsg));
152 error("%s: file descriptor passing not supported", __func__);