Annotation of src/usr.bin/ssh/monitor_fdpass.c, Revision 1.14
1.14 ! deraadt 1: /* $OpenBSD: monitor_fdpass.c,v 1.13 2007/09/04 03:21:03 djm Exp $ */
1.1 provos 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:
1.9 stevesk 27: #include <sys/types.h>
28: #include <sys/socket.h>
1.1 provos 29: #include <sys/uio.h>
1.10 stevesk 30:
31: #include <errno.h>
1.11 stevesk 32: #include <string.h>
1.12 deraadt 33: #include <stdarg.h>
1.1 provos 34:
35: #include "log.h"
36: #include "monitor_fdpass.h"
37:
1.13 djm 38: int
1.5 avsm 39: mm_send_fd(int sock, int fd)
1.1 provos 40: {
41: struct msghdr msg;
1.14 ! deraadt 42: union {
! 43: struct cmsghdr hdr;
! 44: char tmp[CMSG_SPACE(sizeof(int))];
! 45: } tmp;
1.1 provos 46: struct cmsghdr *cmsg;
47: struct iovec vec;
1.2 stevesk 48: char ch = '\0';
1.4 deraadt 49: ssize_t n;
1.1 provos 50:
51: memset(&msg, 0, sizeof(msg));
1.14 ! deraadt 52: msg.msg_control = (caddr_t)&tmp;
1.1 provos 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:
60: vec.iov_base = &ch;
61: vec.iov_len = 1;
62: msg.msg_iov = &vec;
63: msg.msg_iovlen = 1;
64:
1.13 djm 65: if ((n = sendmsg(sock, &msg, 0)) == -1) {
66: error("%s: sendmsg(%d): %s", __func__, fd,
1.2 stevesk 67: strerror(errno));
1.13 djm 68: return -1;
69: }
70:
71: if (n != 1) {
72: error("%s: sendmsg: expected sent 1 got %ld",
1.4 deraadt 73: __func__, (long)n);
1.13 djm 74: return -1;
75: }
76: return 0;
1.1 provos 77: }
78:
79: int
1.5 avsm 80: mm_receive_fd(int sock)
1.1 provos 81: {
82: struct msghdr msg;
1.14 ! deraadt 83: union {
! 84: char tmp[CMSG_SPACE(sizeof(int))];
! 85: struct cmsghdr hdr;
! 86: } tmp;
1.1 provos 87: struct cmsghdr *cmsg;
88: struct iovec vec;
1.4 deraadt 89: ssize_t n;
1.1 provos 90: char ch;
1.4 deraadt 91: int fd;
1.1 provos 92:
93: memset(&msg, 0, sizeof(msg));
94: vec.iov_base = &ch;
95: vec.iov_len = 1;
96: msg.msg_iov = &vec;
97: msg.msg_iovlen = 1;
1.14 ! deraadt 98: msg.msg_control = &tmp;
1.1 provos 99: msg.msg_controllen = sizeof(tmp);
100:
1.13 djm 101: if ((n = recvmsg(sock, &msg, 0)) == -1) {
102: error("%s: recvmsg: %s", __func__, strerror(errno));
103: return -1;
104: }
105:
106: if (n != 1) {
107: error("%s: recvmsg: expected received 1 got %ld",
1.4 deraadt 108: __func__, (long)n);
1.13 djm 109: return -1;
110: }
1.1 provos 111:
112: cmsg = CMSG_FIRSTHDR(&msg);
1.13 djm 113: if (cmsg == NULL) {
114: error("%s: no message header", __func__);
115: return -1;
116: }
117:
118: if (cmsg->cmsg_type != SCM_RIGHTS) {
119: error("%s: expected type %d got %d", __func__,
1.1 provos 120: SCM_RIGHTS, cmsg->cmsg_type);
1.13 djm 121: return -1;
122: }
1.2 stevesk 123: fd = (*(int *)CMSG_DATA(cmsg));
124: return fd;
1.1 provos 125: }