blob: cab538bc900300262cebacde9a2122ab95ce3059 [file] [log] [blame]
Damien Millere241e852008-03-27 11:01:15 +11001/* $OpenBSD: monitor_fdpass.c,v 1.17 2008/03/24 16:11:07 deraadt Exp $ */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002/*
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 Lindstrom7a2073c2002-03-22 02:30:41 +000028
Damien Millere3b60b52006-07-10 21:08:03 +100029#include <sys/types.h>
30#include <sys/socket.h>
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000031#include <sys/uio.h>
Darren Tuckera43c0052006-10-16 19:49:12 +100032#ifdef HAVE_SYS_UN_H
33#include <sys/un.h>
34#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000035
Darren Tucker39972492006-07-12 22:22:46 +100036#include <errno.h>
Damien Millere3476ed2006-07-24 14:13:33 +100037#include <string.h>
Damien Millerd7834352006-08-05 12:39:39 +100038#include <stdarg.h>
Darren Tucker39972492006-07-12 22:22:46 +100039
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000040#include "log.h"
41#include "monitor_fdpass.h"
42
Damien Miller54fd7cf2007-09-17 12:04:08 +100043int
Darren Tucker3f9fdc72004-06-22 12:56:01 +100044mm_send_fd(int sock, int fd)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000045{
Tim Rice66480f12002-04-15 21:10:09 -070046#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000047 struct msghdr msg;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000048 struct iovec vec;
Ben Lindstrom31ee7ae2002-03-26 02:36:29 +000049 char ch = '\0';
Ben Lindstromd5bf46e2002-06-27 00:21:03 +000050 ssize_t n;
Tim Rice28bbb0c2002-05-27 17:37:32 -070051#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
Damien Millerc0c53c32008-03-07 18:35:26 +110052 union {
53 struct cmsghdr hdr;
54 char tmp[CMSG_SPACE(sizeof(int))];
Damien Millerf92e0632008-03-27 10:53:23 +110055 char buf[CMSG_SPACE(sizeof(int))];
56 } cmsgbuf;
Kevin Steves1adb1202002-03-22 19:32:53 +000057 struct cmsghdr *cmsg;
58#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000059
60 memset(&msg, 0, sizeof(msg));
Tim Rice28bbb0c2002-05-27 17:37:32 -070061#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
Kevin Steves1adb1202002-03-22 19:32:53 +000062 msg.msg_accrights = (caddr_t)&fd;
63 msg.msg_accrightslen = sizeof(fd);
64#else
Damien Millerf92e0632008-03-27 10:53:23 +110065 msg.msg_control = (caddr_t)&cmsgbuf.buf;
Damien Millere241e852008-03-27 11:01:15 +110066 msg.msg_controllen = sizeof(cmsgbuf.buf);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000067 cmsg = CMSG_FIRSTHDR(&msg);
68 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
69 cmsg->cmsg_level = SOL_SOCKET;
70 cmsg->cmsg_type = SCM_RIGHTS;
71 *(int *)CMSG_DATA(cmsg) = fd;
Kevin Steves1adb1202002-03-22 19:32:53 +000072#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000073
74 vec.iov_base = &ch;
75 vec.iov_len = 1;
76 msg.msg_iov = &vec;
77 msg.msg_iovlen = 1;
78
Damien Miller54fd7cf2007-09-17 12:04:08 +100079 if ((n = sendmsg(sock, &msg, 0)) == -1) {
80 error("%s: sendmsg(%d): %s", __func__, fd,
Ben Lindstrom31ee7ae2002-03-26 02:36:29 +000081 strerror(errno));
Damien Miller54fd7cf2007-09-17 12:04:08 +100082 return -1;
83 }
84
85 if (n != 1) {
86 error("%s: sendmsg: expected sent 1 got %ld",
Ben Lindstromd5bf46e2002-06-27 00:21:03 +000087 __func__, (long)n);
Damien Miller54fd7cf2007-09-17 12:04:08 +100088 return -1;
89 }
90 return 0;
Kevin Stevesc3c82552002-04-07 16:39:12 +000091#else
Damien Miller54fd7cf2007-09-17 12:04:08 +100092 error("%s: file descriptor passing not supported", __func__);
93 return -1;
Kevin Stevesc3c82552002-04-07 16:39:12 +000094#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000095}
96
97int
Darren Tucker3f9fdc72004-06-22 12:56:01 +100098mm_receive_fd(int sock)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000099{
Tim Rice66480f12002-04-15 21:10:09 -0700100#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000101 struct msghdr msg;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000102 struct iovec vec;
Ben Lindstromd5bf46e2002-06-27 00:21:03 +0000103 ssize_t n;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000104 char ch;
Ben Lindstromd5bf46e2002-06-27 00:21:03 +0000105 int fd;
Tim Rice28bbb0c2002-05-27 17:37:32 -0700106#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
Damien Millerc0c53c32008-03-07 18:35:26 +1100107 union {
Damien Millerc0c53c32008-03-07 18:35:26 +1100108 struct cmsghdr hdr;
Damien Millerf92e0632008-03-27 10:53:23 +1100109 char buf[CMSG_SPACE(sizeof(int))];
110 } cmsgbuf;
Kevin Steves1adb1202002-03-22 19:32:53 +0000111 struct cmsghdr *cmsg;
Kevin Steves1adb1202002-03-22 19:32:53 +0000112#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000113
114 memset(&msg, 0, sizeof(msg));
115 vec.iov_base = &ch;
116 vec.iov_len = 1;
117 msg.msg_iov = &vec;
118 msg.msg_iovlen = 1;
Tim Rice28bbb0c2002-05-27 17:37:32 -0700119#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
Kevin Steves1adb1202002-03-22 19:32:53 +0000120 msg.msg_accrights = (caddr_t)&fd;
121 msg.msg_accrightslen = sizeof(fd);
122#else
Damien Millerf92e0632008-03-27 10:53:23 +1100123 msg.msg_control = &cmsgbuf.buf;
Damien Millere241e852008-03-27 11:01:15 +1100124 msg.msg_controllen = sizeof(cmsgbuf.buf);
Kevin Steves1adb1202002-03-22 19:32:53 +0000125#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000126
Damien Miller54fd7cf2007-09-17 12:04:08 +1000127 if ((n = recvmsg(sock, &msg, 0)) == -1) {
128 error("%s: recvmsg: %s", __func__, strerror(errno));
129 return -1;
130 }
131 if (n != 1) {
132 error("%s: recvmsg: expected received 1 got %ld",
Ben Lindstromd5bf46e2002-06-27 00:21:03 +0000133 __func__, (long)n);
Damien Miller54fd7cf2007-09-17 12:04:08 +1000134 return -1;
135 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000136
Tim Rice28bbb0c2002-05-27 17:37:32 -0700137#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
Damien Miller54fd7cf2007-09-17 12:04:08 +1000138 if (msg.msg_accrightslen != sizeof(fd)) {
139 error("%s: no fd", __func__);
140 return -1;
141 }
Kevin Steves1adb1202002-03-22 19:32:53 +0000142#else
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000143 cmsg = CMSG_FIRSTHDR(&msg);
Damien Miller54fd7cf2007-09-17 12:04:08 +1000144 if (cmsg == NULL) {
145 error("%s: no message header", __func__);
146 return -1;
147 }
Darren Tucker3c016542003-05-02 20:48:21 +1000148#ifndef BROKEN_CMSG_TYPE
Damien Miller54fd7cf2007-09-17 12:04:08 +1000149 if (cmsg->cmsg_type != SCM_RIGHTS) {
150 error("%s: expected type %d got %d", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000151 SCM_RIGHTS, cmsg->cmsg_type);
Damien Miller54fd7cf2007-09-17 12:04:08 +1000152 return -1;
153 }
Darren Tucker3c016542003-05-02 20:48:21 +1000154#endif
Ben Lindstrom31ee7ae2002-03-26 02:36:29 +0000155 fd = (*(int *)CMSG_DATA(cmsg));
Kevin Steves1adb1202002-03-22 19:32:53 +0000156#endif
Ben Lindstrom31ee7ae2002-03-26 02:36:29 +0000157 return fd;
Kevin Stevesc3c82552002-04-07 16:39:12 +0000158#else
Damien Miller54fd7cf2007-09-17 12:04:08 +1000159 error("%s: file descriptor passing not supported", __func__);
160 return -1;
Kevin Stevesc3c82552002-04-07 16:39:12 +0000161#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000162}