Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 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 | } |