Annotation of src/usr.bin/ssh/monitor_fdpass.c, Revision 1.13
1.13 ! djm 1: /* $OpenBSD: monitor_fdpass.c,v 1.12 2006/08/03 03:34:42 deraadt 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;
42: char tmp[CMSG_SPACE(sizeof(int))];
43: struct cmsghdr *cmsg;
44: struct iovec vec;
1.2 stevesk 45: char ch = '\0';
1.4 deraadt 46: ssize_t n;
1.1 provos 47:
48: memset(&msg, 0, sizeof(msg));
49: msg.msg_control = (caddr_t)tmp;
50: msg.msg_controllen = CMSG_LEN(sizeof(int));
51: cmsg = CMSG_FIRSTHDR(&msg);
52: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
53: cmsg->cmsg_level = SOL_SOCKET;
54: cmsg->cmsg_type = SCM_RIGHTS;
55: *(int *)CMSG_DATA(cmsg) = fd;
56:
57: vec.iov_base = &ch;
58: vec.iov_len = 1;
59: msg.msg_iov = &vec;
60: msg.msg_iovlen = 1;
61:
1.13 ! djm 62: if ((n = sendmsg(sock, &msg, 0)) == -1) {
! 63: error("%s: sendmsg(%d): %s", __func__, fd,
1.2 stevesk 64: strerror(errno));
1.13 ! djm 65: return -1;
! 66: }
! 67:
! 68: if (n != 1) {
! 69: error("%s: sendmsg: expected sent 1 got %ld",
1.4 deraadt 70: __func__, (long)n);
1.13 ! djm 71: return -1;
! 72: }
! 73: return 0;
1.1 provos 74: }
75:
76: int
1.5 avsm 77: mm_receive_fd(int sock)
1.1 provos 78: {
79: struct msghdr msg;
80: char tmp[CMSG_SPACE(sizeof(int))];
81: struct cmsghdr *cmsg;
82: struct iovec vec;
1.4 deraadt 83: ssize_t n;
1.1 provos 84: char ch;
1.4 deraadt 85: int fd;
1.1 provos 86:
87: memset(&msg, 0, sizeof(msg));
88: vec.iov_base = &ch;
89: vec.iov_len = 1;
90: msg.msg_iov = &vec;
91: msg.msg_iovlen = 1;
92: msg.msg_control = tmp;
93: msg.msg_controllen = sizeof(tmp);
94:
1.13 ! djm 95: if ((n = recvmsg(sock, &msg, 0)) == -1) {
! 96: error("%s: recvmsg: %s", __func__, strerror(errno));
! 97: return -1;
! 98: }
! 99:
! 100: if (n != 1) {
! 101: error("%s: recvmsg: expected received 1 got %ld",
1.4 deraadt 102: __func__, (long)n);
1.13 ! djm 103: return -1;
! 104: }
1.1 provos 105:
106: cmsg = CMSG_FIRSTHDR(&msg);
1.13 ! djm 107: if (cmsg == NULL) {
! 108: error("%s: no message header", __func__);
! 109: return -1;
! 110: }
! 111:
! 112: if (cmsg->cmsg_type != SCM_RIGHTS) {
! 113: error("%s: expected type %d got %d", __func__,
1.1 provos 114: SCM_RIGHTS, cmsg->cmsg_type);
1.13 ! djm 115: return -1;
! 116: }
1.2 stevesk 117: fd = (*(int *)CMSG_DATA(cmsg));
118: return fd;
1.1 provos 119: }