2 * Copyright 2001 Niels Provos <provos@citi.umich.edu>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 RCSID("$OpenBSD: monitor_fdpass.c,v 1.1 2002/03/18 17:27:22 provos Exp $");
32 #include "monitor_fdpass.h"
35 mm_send_fd(int socket, int fd)
40 #ifndef HAVE_ACCRIGHTS_IN_MSGHDR
41 char tmp[CMSG_SPACE(sizeof(int))];
45 memset(&msg, 0, sizeof(msg));
46 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
47 msg.msg_accrights = (caddr_t)&fd;
48 msg.msg_accrightslen = sizeof(fd);
50 msg.msg_control = (caddr_t)tmp;
51 msg.msg_controllen = CMSG_LEN(sizeof(int));
52 cmsg = CMSG_FIRSTHDR(&msg);
53 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
54 cmsg->cmsg_level = SOL_SOCKET;
55 cmsg->cmsg_type = SCM_RIGHTS;
56 *(int *)CMSG_DATA(cmsg) = fd;
64 if (sendmsg(socket, &msg, 0) == -1)
65 fatal("%s: sendmsg(%d)", __FUNCTION__, fd);
69 mm_receive_fd(int socket)
74 #ifndef HAVE_ACCRIGHTS_IN_MSGHDR
75 char tmp[CMSG_SPACE(sizeof(int))];
81 memset(&msg, 0, sizeof(msg));
86 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
87 msg.msg_accrights = (caddr_t)&fd;
88 msg.msg_accrightslen = sizeof(fd);
90 msg.msg_control = tmp;
91 msg.msg_controllen = sizeof(tmp);
94 if (recvmsg(socket, &msg, 0) == -1)
95 fatal("%s: recvmsg", __FUNCTION__);
97 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
98 if (msg.msg_accrightslen != sizeof(fd))
99 fatal("%s: no fd", __FUNCTION__);
102 cmsg = CMSG_FIRSTHDR(&msg);
103 if (cmsg->cmsg_type != SCM_RIGHTS)
104 fatal("%s: expected type %d got %d", __FUNCTION__,
105 SCM_RIGHTS, cmsg->cmsg_type);
106 return (*(int *)CMSG_DATA(cmsg));