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Commit | Line | Data |
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1853d1ef | 1 | /* |
2 | * Copyright 2001 Niels Provos <provos@citi.umich.edu> | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
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. | |
13 | * | |
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. | |
24 | */ | |
25 | ||
26 | #include "includes.h" | |
27 | RCSID("$OpenBSD: monitor_fdpass.c,v 1.1 2002/03/18 17:27:22 provos Exp $"); | |
28 | ||
29 | #include <sys/uio.h> | |
30 | ||
31 | #include "log.h" | |
32 | #include "monitor_fdpass.h" | |
33 | ||
34 | void | |
35 | mm_send_fd(int socket, int fd) | |
36 | { | |
37 | struct msghdr msg; | |
38 | char tmp[CMSG_SPACE(sizeof(int))]; | |
39 | struct cmsghdr *cmsg; | |
40 | struct iovec vec; | |
41 | char ch; | |
42 | ||
43 | memset(&msg, 0, sizeof(msg)); | |
44 | msg.msg_control = (caddr_t)tmp; | |
45 | msg.msg_controllen = CMSG_LEN(sizeof(int)); | |
46 | cmsg = CMSG_FIRSTHDR(&msg); | |
47 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); | |
48 | cmsg->cmsg_level = SOL_SOCKET; | |
49 | cmsg->cmsg_type = SCM_RIGHTS; | |
50 | *(int *)CMSG_DATA(cmsg) = fd; | |
51 | ||
52 | vec.iov_base = &ch; | |
53 | vec.iov_len = 1; | |
54 | msg.msg_iov = &vec; | |
55 | msg.msg_iovlen = 1; | |
56 | ||
57 | if (sendmsg(socket, &msg, 0) == -1) | |
58 | fatal("%s: sendmsg(%d)", __FUNCTION__, fd); | |
59 | } | |
60 | ||
61 | int | |
62 | mm_receive_fd(int socket) | |
63 | { | |
64 | struct msghdr msg; | |
65 | char tmp[CMSG_SPACE(sizeof(int))]; | |
66 | struct cmsghdr *cmsg; | |
67 | struct iovec vec; | |
68 | char ch; | |
69 | ||
70 | memset(&msg, 0, sizeof(msg)); | |
71 | vec.iov_base = &ch; | |
72 | vec.iov_len = 1; | |
73 | msg.msg_iov = &vec; | |
74 | msg.msg_iovlen = 1; | |
75 | msg.msg_control = tmp; | |
76 | msg.msg_controllen = sizeof(tmp); | |
77 | ||
78 | if (recvmsg(socket, &msg, 0) == -1) | |
79 | fatal("%s: recvmsg", __FUNCTION__); | |
80 | ||
81 | cmsg = CMSG_FIRSTHDR(&msg); | |
82 | if (cmsg->cmsg_type != SCM_RIGHTS) | |
83 | fatal("%s: expected type %d got %d", __FUNCTION__, | |
84 | SCM_RIGHTS, cmsg->cmsg_type); | |
85 | return (*(int *)CMSG_DATA(cmsg)); | |
86 | } |