Darren Tucker | e371a13 | 2010-01-12 19:43:12 +1100 | [diff] [blame^] | 1 | /* $OpenBSD: monitor_fdpass.c,v 1.19 2010/01/12 00:58:25 djm Exp $ */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 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" |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 28 | |
Damien Miller | e3b60b5 | 2006-07-10 21:08:03 +1000 | [diff] [blame] | 29 | #include <sys/types.h> |
| 30 | #include <sys/socket.h> |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 31 | #include <sys/uio.h> |
Darren Tucker | a43c005 | 2006-10-16 19:49:12 +1000 | [diff] [blame] | 32 | #ifdef HAVE_SYS_UN_H |
| 33 | #include <sys/un.h> |
| 34 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 35 | |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 36 | #include <errno.h> |
Darren Tucker | e371a13 | 2010-01-12 19:43:12 +1100 | [diff] [blame^] | 37 | #include <poll.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 38 | #include <string.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 39 | #include <stdarg.h> |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 40 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 41 | #include "log.h" |
| 42 | #include "monitor_fdpass.h" |
| 43 | |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 44 | int |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 45 | mm_send_fd(int sock, int fd) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 46 | { |
Tim Rice | 66480f1 | 2002-04-15 21:10:09 -0700 | [diff] [blame] | 47 | #if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR)) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 48 | struct msghdr msg; |
Tim Rice | 28bbb0c | 2002-05-27 17:37:32 -0700 | [diff] [blame] | 49 | #ifndef HAVE_ACCRIGHTS_IN_MSGHDR |
Damien Miller | c0c53c3 | 2008-03-07 18:35:26 +1100 | [diff] [blame] | 50 | union { |
| 51 | struct cmsghdr hdr; |
Damien Miller | f92e063 | 2008-03-27 10:53:23 +1100 | [diff] [blame] | 52 | char buf[CMSG_SPACE(sizeof(int))]; |
| 53 | } cmsgbuf; |
Kevin Steves | 1adb120 | 2002-03-22 19:32:53 +0000 | [diff] [blame] | 54 | struct cmsghdr *cmsg; |
| 55 | #endif |
Darren Tucker | 69087ea | 2008-11-23 14:03:19 +1100 | [diff] [blame] | 56 | struct iovec vec; |
| 57 | char ch = '\0'; |
| 58 | ssize_t n; |
Darren Tucker | e371a13 | 2010-01-12 19:43:12 +1100 | [diff] [blame^] | 59 | struct pollfd pfd; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 60 | |
| 61 | memset(&msg, 0, sizeof(msg)); |
Tim Rice | 28bbb0c | 2002-05-27 17:37:32 -0700 | [diff] [blame] | 62 | #ifdef HAVE_ACCRIGHTS_IN_MSGHDR |
Kevin Steves | 1adb120 | 2002-03-22 19:32:53 +0000 | [diff] [blame] | 63 | msg.msg_accrights = (caddr_t)&fd; |
| 64 | msg.msg_accrightslen = sizeof(fd); |
| 65 | #else |
Damien Miller | f92e063 | 2008-03-27 10:53:23 +1100 | [diff] [blame] | 66 | msg.msg_control = (caddr_t)&cmsgbuf.buf; |
Damien Miller | e241e85 | 2008-03-27 11:01:15 +1100 | [diff] [blame] | 67 | msg.msg_controllen = sizeof(cmsgbuf.buf); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 68 | cmsg = CMSG_FIRSTHDR(&msg); |
| 69 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); |
| 70 | cmsg->cmsg_level = SOL_SOCKET; |
| 71 | cmsg->cmsg_type = SCM_RIGHTS; |
| 72 | *(int *)CMSG_DATA(cmsg) = fd; |
Kevin Steves | 1adb120 | 2002-03-22 19:32:53 +0000 | [diff] [blame] | 73 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 74 | |
| 75 | vec.iov_base = &ch; |
| 76 | vec.iov_len = 1; |
| 77 | msg.msg_iov = &vec; |
| 78 | msg.msg_iovlen = 1; |
| 79 | |
Darren Tucker | e371a13 | 2010-01-12 19:43:12 +1100 | [diff] [blame^] | 80 | pfd.fd = sock; |
| 81 | pfd.events = POLLOUT; |
| 82 | while ((n = sendmsg(sock, &msg, 0)) == -1 && |
| 83 | (errno == EAGAIN || errno == EINTR)) { |
Darren Tucker | 2364564 | 2008-12-01 21:42:13 +1100 | [diff] [blame] | 84 | debug3("%s: sendmsg(%d): %s", __func__, fd, strerror(errno)); |
Darren Tucker | e371a13 | 2010-01-12 19:43:12 +1100 | [diff] [blame^] | 85 | (void)poll(&pfd, 1, -1); |
| 86 | } |
Darren Tucker | 2364564 | 2008-12-01 21:42:13 +1100 | [diff] [blame] | 87 | if (n == -1) { |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 88 | error("%s: sendmsg(%d): %s", __func__, fd, |
Ben Lindstrom | 31ee7ae | 2002-03-26 02:36:29 +0000 | [diff] [blame] | 89 | strerror(errno)); |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 90 | return -1; |
| 91 | } |
| 92 | |
| 93 | if (n != 1) { |
| 94 | error("%s: sendmsg: expected sent 1 got %ld", |
Ben Lindstrom | d5bf46e | 2002-06-27 00:21:03 +0000 | [diff] [blame] | 95 | __func__, (long)n); |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 96 | return -1; |
| 97 | } |
| 98 | return 0; |
Kevin Steves | c3c8255 | 2002-04-07 16:39:12 +0000 | [diff] [blame] | 99 | #else |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 100 | error("%s: file descriptor passing not supported", __func__); |
| 101 | return -1; |
Kevin Steves | c3c8255 | 2002-04-07 16:39:12 +0000 | [diff] [blame] | 102 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | int |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 106 | mm_receive_fd(int sock) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 107 | { |
Tim Rice | 66480f1 | 2002-04-15 21:10:09 -0700 | [diff] [blame] | 108 | #if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR)) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 109 | struct msghdr msg; |
Tim Rice | 28bbb0c | 2002-05-27 17:37:32 -0700 | [diff] [blame] | 110 | #ifndef HAVE_ACCRIGHTS_IN_MSGHDR |
Damien Miller | c0c53c3 | 2008-03-07 18:35:26 +1100 | [diff] [blame] | 111 | union { |
Damien Miller | c0c53c3 | 2008-03-07 18:35:26 +1100 | [diff] [blame] | 112 | struct cmsghdr hdr; |
Damien Miller | f92e063 | 2008-03-27 10:53:23 +1100 | [diff] [blame] | 113 | char buf[CMSG_SPACE(sizeof(int))]; |
| 114 | } cmsgbuf; |
Kevin Steves | 1adb120 | 2002-03-22 19:32:53 +0000 | [diff] [blame] | 115 | struct cmsghdr *cmsg; |
Kevin Steves | 1adb120 | 2002-03-22 19:32:53 +0000 | [diff] [blame] | 116 | #endif |
Darren Tucker | 69087ea | 2008-11-23 14:03:19 +1100 | [diff] [blame] | 117 | struct iovec vec; |
| 118 | ssize_t n; |
| 119 | char ch; |
| 120 | int fd; |
Darren Tucker | e371a13 | 2010-01-12 19:43:12 +1100 | [diff] [blame^] | 121 | struct pollfd pfd; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 122 | |
| 123 | memset(&msg, 0, sizeof(msg)); |
| 124 | vec.iov_base = &ch; |
| 125 | vec.iov_len = 1; |
| 126 | msg.msg_iov = &vec; |
| 127 | msg.msg_iovlen = 1; |
Tim Rice | 28bbb0c | 2002-05-27 17:37:32 -0700 | [diff] [blame] | 128 | #ifdef HAVE_ACCRIGHTS_IN_MSGHDR |
Kevin Steves | 1adb120 | 2002-03-22 19:32:53 +0000 | [diff] [blame] | 129 | msg.msg_accrights = (caddr_t)&fd; |
| 130 | msg.msg_accrightslen = sizeof(fd); |
| 131 | #else |
Damien Miller | f92e063 | 2008-03-27 10:53:23 +1100 | [diff] [blame] | 132 | msg.msg_control = &cmsgbuf.buf; |
Damien Miller | e241e85 | 2008-03-27 11:01:15 +1100 | [diff] [blame] | 133 | msg.msg_controllen = sizeof(cmsgbuf.buf); |
Kevin Steves | 1adb120 | 2002-03-22 19:32:53 +0000 | [diff] [blame] | 134 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 135 | |
Darren Tucker | e371a13 | 2010-01-12 19:43:12 +1100 | [diff] [blame^] | 136 | pfd.fd = sock; |
| 137 | pfd.events = POLLIN; |
| 138 | while ((n = recvmsg(sock, &msg, 0)) == -1 && |
| 139 | (errno == EAGAIN || errno == EINTR)) { |
Darren Tucker | 2364564 | 2008-12-01 21:42:13 +1100 | [diff] [blame] | 140 | debug3("%s: recvmsg: %s", __func__, strerror(errno)); |
Darren Tucker | e371a13 | 2010-01-12 19:43:12 +1100 | [diff] [blame^] | 141 | (void)poll(&pfd, 1, -1); |
| 142 | } |
Darren Tucker | 2364564 | 2008-12-01 21:42:13 +1100 | [diff] [blame] | 143 | if (n == -1) { |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 144 | error("%s: recvmsg: %s", __func__, strerror(errno)); |
| 145 | return -1; |
| 146 | } |
Darren Tucker | 69087ea | 2008-11-23 14:03:19 +1100 | [diff] [blame] | 147 | |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 148 | if (n != 1) { |
| 149 | error("%s: recvmsg: expected received 1 got %ld", |
Ben Lindstrom | d5bf46e | 2002-06-27 00:21:03 +0000 | [diff] [blame] | 150 | __func__, (long)n); |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 151 | return -1; |
| 152 | } |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 153 | |
Tim Rice | 28bbb0c | 2002-05-27 17:37:32 -0700 | [diff] [blame] | 154 | #ifdef HAVE_ACCRIGHTS_IN_MSGHDR |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 155 | if (msg.msg_accrightslen != sizeof(fd)) { |
| 156 | error("%s: no fd", __func__); |
| 157 | return -1; |
| 158 | } |
Kevin Steves | 1adb120 | 2002-03-22 19:32:53 +0000 | [diff] [blame] | 159 | #else |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 160 | cmsg = CMSG_FIRSTHDR(&msg); |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 161 | if (cmsg == NULL) { |
| 162 | error("%s: no message header", __func__); |
| 163 | return -1; |
| 164 | } |
Darren Tucker | 69087ea | 2008-11-23 14:03:19 +1100 | [diff] [blame] | 165 | |
Darren Tucker | 3c01654 | 2003-05-02 20:48:21 +1000 | [diff] [blame] | 166 | #ifndef BROKEN_CMSG_TYPE |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 167 | if (cmsg->cmsg_type != SCM_RIGHTS) { |
| 168 | error("%s: expected type %d got %d", __func__, |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 169 | SCM_RIGHTS, cmsg->cmsg_type); |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 170 | return -1; |
| 171 | } |
Darren Tucker | 3c01654 | 2003-05-02 20:48:21 +1000 | [diff] [blame] | 172 | #endif |
Ben Lindstrom | 31ee7ae | 2002-03-26 02:36:29 +0000 | [diff] [blame] | 173 | fd = (*(int *)CMSG_DATA(cmsg)); |
Kevin Steves | 1adb120 | 2002-03-22 19:32:53 +0000 | [diff] [blame] | 174 | #endif |
Ben Lindstrom | 31ee7ae | 2002-03-26 02:36:29 +0000 | [diff] [blame] | 175 | return fd; |
Kevin Steves | c3c8255 | 2002-04-07 16:39:12 +0000 | [diff] [blame] | 176 | #else |
Damien Miller | 54fd7cf | 2007-09-17 12:04:08 +1000 | [diff] [blame] | 177 | error("%s: file descriptor passing not supported", __func__); |
| 178 | return -1; |
Kevin Steves | c3c8255 | 2002-04-07 16:39:12 +0000 | [diff] [blame] | 179 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 180 | } |