Annotation of src/usr.bin/ssh/monitor_fdpass.c, Revision 1.18
1.18 ! dtucker 1: /* $OpenBSD: monitor_fdpass.c,v 1.17 2008/03/24 16:11:07 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;
1.14 deraadt 42: union {
43: struct cmsghdr hdr;
1.15 deraadt 44: char buf[CMSG_SPACE(sizeof(int))];
45: } cmsgbuf;
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));
1.15 deraadt 52: msg.msg_control = (caddr_t)&cmsgbuf.buf;
1.17 deraadt 53: msg.msg_controllen = sizeof(cmsgbuf.buf);
1.1 provos 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:
1.18 ! dtucker 65: while ((n = sendmsg(sock, &msg, 0)) == -1 && (errno == EAGAIN ||
! 66: errno == EINTR))
! 67: debug3("%s: sendmsg(%d): %s", __func__, fd, strerror(errno));
! 68: if (n == -1) {
1.13 djm 69: error("%s: sendmsg(%d): %s", __func__, fd,
1.2 stevesk 70: strerror(errno));
1.13 djm 71: return -1;
72: }
73:
74: if (n != 1) {
75: error("%s: sendmsg: expected sent 1 got %ld",
1.4 deraadt 76: __func__, (long)n);
1.13 djm 77: return -1;
78: }
79: return 0;
1.1 provos 80: }
81:
82: int
1.5 avsm 83: mm_receive_fd(int sock)
1.1 provos 84: {
85: struct msghdr msg;
1.14 deraadt 86: union {
87: struct cmsghdr hdr;
1.15 deraadt 88: char buf[CMSG_SPACE(sizeof(int))];
89: } cmsgbuf;
1.1 provos 90: struct cmsghdr *cmsg;
91: struct iovec vec;
1.4 deraadt 92: ssize_t n;
1.1 provos 93: char ch;
1.4 deraadt 94: int fd;
1.1 provos 95:
96: memset(&msg, 0, sizeof(msg));
97: vec.iov_base = &ch;
98: vec.iov_len = 1;
99: msg.msg_iov = &vec;
100: msg.msg_iovlen = 1;
1.15 deraadt 101: msg.msg_control = &cmsgbuf.buf;
1.17 deraadt 102: msg.msg_controllen = sizeof(cmsgbuf.buf);
1.1 provos 103:
1.18 ! dtucker 104: while ((n = recvmsg(sock, &msg, 0)) == -1 && (errno == EAGAIN ||
! 105: errno == EINTR))
! 106: debug3("%s: recvmsg: %s", __func__, strerror(errno));
! 107: if (n == -1) {
1.13 djm 108: error("%s: recvmsg: %s", __func__, strerror(errno));
109: return -1;
110: }
111:
112: if (n != 1) {
113: error("%s: recvmsg: expected received 1 got %ld",
1.4 deraadt 114: __func__, (long)n);
1.13 djm 115: return -1;
116: }
1.1 provos 117:
118: cmsg = CMSG_FIRSTHDR(&msg);
1.13 djm 119: if (cmsg == NULL) {
120: error("%s: no message header", __func__);
121: return -1;
122: }
123:
124: if (cmsg->cmsg_type != SCM_RIGHTS) {
125: error("%s: expected type %d got %d", __func__,
1.1 provos 126: SCM_RIGHTS, cmsg->cmsg_type);
1.13 djm 127: return -1;
128: }
1.2 stevesk 129: fd = (*(int *)CMSG_DATA(cmsg));
130: return fd;
1.1 provos 131: }
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