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2980ea68 | 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" | |
e54b3d7c | 27 | RCSID("$OpenBSD: monitor_fdpass.c,v 1.4 2002/06/26 14:50:04 deraadt Exp $"); |
2980ea68 | 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 | #if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR)) | |
38 | struct msghdr msg; | |
39 | struct iovec vec; | |
40 | char ch = '\0'; | |
e54b3d7c | 41 | ssize_t n; |
078f71c2 | 42 | #ifndef HAVE_ACCRIGHTS_IN_MSGHDR |
2980ea68 | 43 | char tmp[CMSG_SPACE(sizeof(int))]; |
44 | struct cmsghdr *cmsg; | |
45 | #endif | |
46 | ||
47 | memset(&msg, 0, sizeof(msg)); | |
078f71c2 | 48 | #ifdef HAVE_ACCRIGHTS_IN_MSGHDR |
2980ea68 | 49 | msg.msg_accrights = (caddr_t)&fd; |
50 | msg.msg_accrightslen = sizeof(fd); | |
51 | #else | |
52 | msg.msg_control = (caddr_t)tmp; | |
53 | msg.msg_controllen = CMSG_LEN(sizeof(int)); | |
54 | cmsg = CMSG_FIRSTHDR(&msg); | |
55 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); | |
56 | cmsg->cmsg_level = SOL_SOCKET; | |
57 | cmsg->cmsg_type = SCM_RIGHTS; | |
58 | *(int *)CMSG_DATA(cmsg) = fd; | |
59 | #endif | |
60 | ||
61 | vec.iov_base = &ch; | |
62 | vec.iov_len = 1; | |
63 | msg.msg_iov = &vec; | |
64 | msg.msg_iovlen = 1; | |
65 | ||
66 | if ((n = sendmsg(socket, &msg, 0)) == -1) | |
ff2d7a98 | 67 | fatal("%s: sendmsg(%d): %s", __func__, fd, |
2980ea68 | 68 | strerror(errno)); |
69 | if (n != 1) | |
e54b3d7c | 70 | fatal("%s: sendmsg: expected sent 1 got %ld", |
71 | __func__, (long)n); | |
2980ea68 | 72 | #else |
73 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
ff2d7a98 | 74 | __func__); |
2980ea68 | 75 | #endif |
76 | } | |
77 | ||
78 | int | |
79 | mm_receive_fd(int socket) | |
80 | { | |
81 | #if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR)) | |
82 | struct msghdr msg; | |
83 | struct iovec vec; | |
e54b3d7c | 84 | ssize_t n; |
2980ea68 | 85 | char ch; |
e54b3d7c | 86 | int fd; |
078f71c2 | 87 | #ifndef HAVE_ACCRIGHTS_IN_MSGHDR |
2980ea68 | 88 | char tmp[CMSG_SPACE(sizeof(int))]; |
89 | struct cmsghdr *cmsg; | |
90 | #endif | |
91 | ||
92 | memset(&msg, 0, sizeof(msg)); | |
93 | vec.iov_base = &ch; | |
94 | vec.iov_len = 1; | |
95 | msg.msg_iov = &vec; | |
96 | msg.msg_iovlen = 1; | |
078f71c2 | 97 | #ifdef HAVE_ACCRIGHTS_IN_MSGHDR |
2980ea68 | 98 | msg.msg_accrights = (caddr_t)&fd; |
99 | msg.msg_accrightslen = sizeof(fd); | |
100 | #else | |
101 | msg.msg_control = tmp; | |
102 | msg.msg_controllen = sizeof(tmp); | |
103 | #endif | |
104 | ||
105 | if ((n = recvmsg(socket, &msg, 0)) == -1) | |
ff2d7a98 | 106 | fatal("%s: recvmsg: %s", __func__, strerror(errno)); |
2980ea68 | 107 | if (n != 1) |
e54b3d7c | 108 | fatal("%s: recvmsg: expected received 1 got %ld", |
109 | __func__, (long)n); | |
2980ea68 | 110 | |
078f71c2 | 111 | #ifdef HAVE_ACCRIGHTS_IN_MSGHDR |
2980ea68 | 112 | if (msg.msg_accrightslen != sizeof(fd)) |
ff2d7a98 | 113 | fatal("%s: no fd", __func__); |
2980ea68 | 114 | #else |
115 | cmsg = CMSG_FIRSTHDR(&msg); | |
70791e56 | 116 | #ifndef BROKEN_CMSG_TYPE |
2980ea68 | 117 | if (cmsg->cmsg_type != SCM_RIGHTS) |
ff2d7a98 | 118 | fatal("%s: expected type %d got %d", __func__, |
2980ea68 | 119 | SCM_RIGHTS, cmsg->cmsg_type); |
70791e56 | 120 | #endif |
2980ea68 | 121 | fd = (*(int *)CMSG_DATA(cmsg)); |
122 | #endif | |
123 | return fd; | |
124 | #else | |
125 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
ff2d7a98 | 126 | __func__); |
2980ea68 | 127 | #endif |
128 | } |