1 /* $OpenBSD: monitor_fdpass.c,v 1.18 2008/11/30 11:59:26 dtucker 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))
48 #ifndef HAVE_ACCRIGHTS_IN_MSGHDR
51 char buf[CMSG_SPACE(sizeof(int))];
59 memset(&msg, 0, sizeof(msg));
60 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
61 msg.msg_accrights = (caddr_t)&fd;
62 msg.msg_accrightslen = sizeof(fd);
64 msg.msg_control = (caddr_t)&cmsgbuf.buf;
65 msg.msg_controllen = sizeof(cmsgbuf.buf);
66 cmsg = CMSG_FIRSTHDR(&msg);
67 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
68 cmsg->cmsg_level = SOL_SOCKET;
69 cmsg->cmsg_type = SCM_RIGHTS;
70 *(int *)CMSG_DATA(cmsg) = fd;
78 while ((n = sendmsg(sock, &msg, 0)) == -1 && (errno == EAGAIN ||
80 debug3("%s: sendmsg(%d): %s", __func__, fd, strerror(errno));
82 error("%s: sendmsg(%d): %s", __func__, fd,
88 error("%s: sendmsg: expected sent 1 got %ld",
94 error("%s: file descriptor passing not supported", __func__);
100 mm_receive_fd(int sock)
102 #if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
104 #ifndef HAVE_ACCRIGHTS_IN_MSGHDR
107 char buf[CMSG_SPACE(sizeof(int))];
109 struct cmsghdr *cmsg;
116 memset(&msg, 0, sizeof(msg));
121 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
122 msg.msg_accrights = (caddr_t)&fd;
123 msg.msg_accrightslen = sizeof(fd);
125 msg.msg_control = &cmsgbuf.buf;
126 msg.msg_controllen = sizeof(cmsgbuf.buf);
129 while ((n = recvmsg(sock, &msg, 0)) == -1 && (errno == EAGAIN ||
131 debug3("%s: recvmsg: %s", __func__, strerror(errno));
133 error("%s: recvmsg: %s", __func__, strerror(errno));
138 error("%s: recvmsg: expected received 1 got %ld",
143 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
144 if (msg.msg_accrightslen != sizeof(fd)) {
145 error("%s: no fd", __func__);
149 cmsg = CMSG_FIRSTHDR(&msg);
151 error("%s: no message header", __func__);
155 #ifndef BROKEN_CMSG_TYPE
156 if (cmsg->cmsg_type != SCM_RIGHTS) {
157 error("%s: expected type %d got %d", __func__,
158 SCM_RIGHTS, cmsg->cmsg_type);
162 fd = (*(int *)CMSG_DATA(cmsg));
166 error("%s: file descriptor passing not supported", __func__);