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028094f4 | 1 | /* $OpenBSD: monitor_fdpass.c,v 1.10 2006/07/11 20:07:25 stevesk Exp $ */ |
1853d1ef | 2 | /* |
3 | * Copyright 2001 Niels Provos <provos@citi.umich.edu> | |
4 | * All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
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. | |
14 | * | |
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. | |
25 | */ | |
26 | ||
27 | #include "includes.h" | |
1853d1ef | 28 | |
5b04a8bf | 29 | #include <sys/types.h> |
30 | #include <sys/socket.h> | |
1853d1ef | 31 | #include <sys/uio.h> |
32 | ||
028094f4 | 33 | #include <errno.h> |
34 | ||
1853d1ef | 35 | #include "log.h" |
36 | #include "monitor_fdpass.h" | |
37 | ||
38 | void | |
ca75d7de | 39 | mm_send_fd(int sock, int fd) |
1853d1ef | 40 | { |
1b06e75e | 41 | #if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR)) |
1853d1ef | 42 | struct msghdr msg; |
1853d1ef | 43 | struct iovec vec; |
d4355079 | 44 | char ch = '\0'; |
63b5f1a1 | 45 | ssize_t n; |
637f9177 | 46 | #ifndef HAVE_ACCRIGHTS_IN_MSGHDR |
dc90b259 | 47 | char tmp[CMSG_SPACE(sizeof(int))]; |
48 | struct cmsghdr *cmsg; | |
49 | #endif | |
1853d1ef | 50 | |
51 | memset(&msg, 0, sizeof(msg)); | |
637f9177 | 52 | #ifdef HAVE_ACCRIGHTS_IN_MSGHDR |
dc90b259 | 53 | msg.msg_accrights = (caddr_t)&fd; |
54 | msg.msg_accrightslen = sizeof(fd); | |
55 | #else | |
1853d1ef | 56 | msg.msg_control = (caddr_t)tmp; |
57 | msg.msg_controllen = CMSG_LEN(sizeof(int)); | |
58 | cmsg = CMSG_FIRSTHDR(&msg); | |
59 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); | |
60 | cmsg->cmsg_level = SOL_SOCKET; | |
61 | cmsg->cmsg_type = SCM_RIGHTS; | |
62 | *(int *)CMSG_DATA(cmsg) = fd; | |
dc90b259 | 63 | #endif |
1853d1ef | 64 | |
65 | vec.iov_base = &ch; | |
66 | vec.iov_len = 1; | |
67 | msg.msg_iov = &vec; | |
68 | msg.msg_iovlen = 1; | |
69 | ||
ca75d7de | 70 | if ((n = sendmsg(sock, &msg, 0)) == -1) |
1588c277 | 71 | fatal("%s: sendmsg(%d): %s", __func__, fd, |
d4355079 | 72 | strerror(errno)); |
73 | if (n != 1) | |
63b5f1a1 | 74 | fatal("%s: sendmsg: expected sent 1 got %ld", |
75 | __func__, (long)n); | |
84071420 | 76 | #else |
77 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 78 | __func__); |
84071420 | 79 | #endif |
1853d1ef | 80 | } |
81 | ||
82 | int | |
ca75d7de | 83 | mm_receive_fd(int sock) |
1853d1ef | 84 | { |
1b06e75e | 85 | #if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR)) |
1853d1ef | 86 | struct msghdr msg; |
1853d1ef | 87 | struct iovec vec; |
63b5f1a1 | 88 | ssize_t n; |
1853d1ef | 89 | char ch; |
63b5f1a1 | 90 | int fd; |
637f9177 | 91 | #ifndef HAVE_ACCRIGHTS_IN_MSGHDR |
dc90b259 | 92 | char tmp[CMSG_SPACE(sizeof(int))]; |
93 | struct cmsghdr *cmsg; | |
dc90b259 | 94 | #endif |
1853d1ef | 95 | |
96 | memset(&msg, 0, sizeof(msg)); | |
97 | vec.iov_base = &ch; | |
98 | vec.iov_len = 1; | |
99 | msg.msg_iov = &vec; | |
100 | msg.msg_iovlen = 1; | |
637f9177 | 101 | #ifdef HAVE_ACCRIGHTS_IN_MSGHDR |
dc90b259 | 102 | msg.msg_accrights = (caddr_t)&fd; |
103 | msg.msg_accrightslen = sizeof(fd); | |
104 | #else | |
1853d1ef | 105 | msg.msg_control = tmp; |
106 | msg.msg_controllen = sizeof(tmp); | |
dc90b259 | 107 | #endif |
1853d1ef | 108 | |
ca75d7de | 109 | if ((n = recvmsg(sock, &msg, 0)) == -1) |
1588c277 | 110 | fatal("%s: recvmsg: %s", __func__, strerror(errno)); |
d4355079 | 111 | if (n != 1) |
63b5f1a1 | 112 | fatal("%s: recvmsg: expected received 1 got %ld", |
113 | __func__, (long)n); | |
1853d1ef | 114 | |
637f9177 | 115 | #ifdef HAVE_ACCRIGHTS_IN_MSGHDR |
dc90b259 | 116 | if (msg.msg_accrightslen != sizeof(fd)) |
1588c277 | 117 | fatal("%s: no fd", __func__); |
dc90b259 | 118 | #else |
1853d1ef | 119 | cmsg = CMSG_FIRSTHDR(&msg); |
fb3d6bd2 | 120 | if (cmsg == NULL) |
121 | fatal("%s: no message header", __func__); | |
bf7c1e6c | 122 | #ifndef BROKEN_CMSG_TYPE |
1853d1ef | 123 | if (cmsg->cmsg_type != SCM_RIGHTS) |
1588c277 | 124 | fatal("%s: expected type %d got %d", __func__, |
1853d1ef | 125 | SCM_RIGHTS, cmsg->cmsg_type); |
bf7c1e6c | 126 | #endif |
d4355079 | 127 | fd = (*(int *)CMSG_DATA(cmsg)); |
dc90b259 | 128 | #endif |
d4355079 | 129 | return fd; |
84071420 | 130 | #else |
131 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 132 | __func__); |
84071420 | 133 | #endif |
1853d1ef | 134 | } |