diff options
Diffstat (limited to 'monitor_fdpass.c')
-rw-r--r-- | monitor_fdpass.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/monitor_fdpass.c b/monitor_fdpass.c new file mode 100644 index 000000000..7785535bb --- /dev/null +++ b/monitor_fdpass.c | |||
@@ -0,0 +1,86 @@ | |||
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 | } | ||