1 /* $OpenBSD: monitor_fdpass.c,v 1.22 2020/10/18 11:32:01 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>
43 # ifdef HAVE_SYS_POLL_H
44 # include <sys/poll.h>
49 #include "monitor_fdpass.h"
52 mm_send_fd(int sock, int fd)
54 #if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
56 #ifndef HAVE_ACCRIGHTS_IN_MSGHDR
59 char buf[CMSG_SPACE(sizeof(int))];
68 memset(&msg, 0, sizeof(msg));
69 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
70 msg.msg_accrights = (caddr_t)&fd;
71 msg.msg_accrightslen = sizeof(fd);
73 memset(&cmsgbuf, 0, sizeof(cmsgbuf));
74 msg.msg_control = (caddr_t)&cmsgbuf.buf;
75 msg.msg_controllen = sizeof(cmsgbuf.buf);
76 cmsg = CMSG_FIRSTHDR(&msg);
77 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
78 cmsg->cmsg_level = SOL_SOCKET;
79 cmsg->cmsg_type = SCM_RIGHTS;
80 *(int *)CMSG_DATA(cmsg) = fd;
90 while ((n = sendmsg(sock, &msg, 0)) == -1 &&
91 (errno == EAGAIN || errno == EINTR)) {
92 debug3_f("sendmsg(%d): %s", fd, strerror(errno));
93 (void)poll(&pfd, 1, -1);
96 error_f("sendmsg(%d): %s", fd, strerror(errno));
101 error_f("sendmsg: expected sent 1 got %zd", n);
106 error("%s: file descriptor passing not supported", __func__);
112 mm_receive_fd(int sock)
114 #if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
116 #ifndef HAVE_ACCRIGHTS_IN_MSGHDR
119 char buf[CMSG_SPACE(sizeof(int))];
121 struct cmsghdr *cmsg;
129 memset(&msg, 0, sizeof(msg));
134 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
135 msg.msg_accrights = (caddr_t)&fd;
136 msg.msg_accrightslen = sizeof(fd);
138 memset(&cmsgbuf, 0, sizeof(cmsgbuf));
139 msg.msg_control = &cmsgbuf.buf;
140 msg.msg_controllen = sizeof(cmsgbuf.buf);
145 while ((n = recvmsg(sock, &msg, 0)) == -1 &&
146 (errno == EAGAIN || errno == EINTR)) {
147 debug3_f("recvmsg: %s", strerror(errno));
148 (void)poll(&pfd, 1, -1);
151 error_f("recvmsg: %s", strerror(errno));
156 error_f("recvmsg: expected received 1 got %zd", n);
160 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
161 if (msg.msg_accrightslen != sizeof(fd)) {
166 cmsg = CMSG_FIRSTHDR(&msg);
168 error_f("no message header");
172 #ifndef BROKEN_CMSG_TYPE
173 if (cmsg->cmsg_type != SCM_RIGHTS) {
174 error_f("expected %d got %d", SCM_RIGHTS, cmsg->cmsg_type);
178 fd = (*(int *)CMSG_DATA(cmsg));
182 error_f("file descriptor passing not supported");