Annotation of src/usr.bin/ssh/monitor_fdpass.c, Revision 1.22
1.22 ! djm 1: /* $OpenBSD: monitor_fdpass.c,v 1.21 2016/02/29 20:22:36 jca 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>
1.19 djm 32: #include <poll.h>
1.11 stevesk 33: #include <string.h>
1.12 deraadt 34: #include <stdarg.h>
1.1 provos 35:
36: #include "log.h"
37: #include "monitor_fdpass.h"
38:
1.13 djm 39: int
1.5 avsm 40: mm_send_fd(int sock, int fd)
1.1 provos 41: {
42: struct msghdr msg;
1.14 deraadt 43: union {
44: struct cmsghdr hdr;
1.15 deraadt 45: char buf[CMSG_SPACE(sizeof(int))];
46: } cmsgbuf;
1.1 provos 47: struct cmsghdr *cmsg;
48: struct iovec vec;
1.2 stevesk 49: char ch = '\0';
1.4 deraadt 50: ssize_t n;
1.19 djm 51: struct pollfd pfd;
1.1 provos 52:
53: memset(&msg, 0, sizeof(msg));
1.20 djm 54: memset(&cmsgbuf, 0, sizeof(cmsgbuf));
1.15 deraadt 55: msg.msg_control = (caddr_t)&cmsgbuf.buf;
1.17 deraadt 56: msg.msg_controllen = sizeof(cmsgbuf.buf);
1.1 provos 57: cmsg = CMSG_FIRSTHDR(&msg);
58: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
59: cmsg->cmsg_level = SOL_SOCKET;
60: cmsg->cmsg_type = SCM_RIGHTS;
61: *(int *)CMSG_DATA(cmsg) = fd;
62:
63: vec.iov_base = &ch;
64: vec.iov_len = 1;
65: msg.msg_iov = &vec;
66: msg.msg_iovlen = 1;
67:
1.19 djm 68: pfd.fd = sock;
69: pfd.events = POLLOUT;
70: while ((n = sendmsg(sock, &msg, 0)) == -1 &&
71: (errno == EAGAIN || errno == EINTR)) {
1.22 ! djm 72: debug3_f("sendmsg(%d): %s", fd, strerror(errno));
1.19 djm 73: (void)poll(&pfd, 1, -1);
74: }
1.18 dtucker 75: if (n == -1) {
1.22 ! djm 76: error_f("sendmsg(%d): %s", fd, strerror(errno));
1.13 djm 77: return -1;
78: }
79:
80: if (n != 1) {
1.22 ! djm 81: error_f("sendmsg: expected sent 1 got %zd", n);
1.13 djm 82: return -1;
83: }
84: return 0;
1.1 provos 85: }
86:
87: int
1.5 avsm 88: mm_receive_fd(int sock)
1.1 provos 89: {
90: struct msghdr msg;
1.14 deraadt 91: union {
92: struct cmsghdr hdr;
1.15 deraadt 93: char buf[CMSG_SPACE(sizeof(int))];
94: } cmsgbuf;
1.1 provos 95: struct cmsghdr *cmsg;
96: struct iovec vec;
1.4 deraadt 97: ssize_t n;
1.1 provos 98: char ch;
1.4 deraadt 99: int fd;
1.19 djm 100: struct pollfd pfd;
1.1 provos 101:
102: memset(&msg, 0, sizeof(msg));
1.20 djm 103: memset(&cmsgbuf, 0, sizeof(cmsgbuf));
1.1 provos 104: vec.iov_base = &ch;
105: vec.iov_len = 1;
106: msg.msg_iov = &vec;
107: msg.msg_iovlen = 1;
1.15 deraadt 108: msg.msg_control = &cmsgbuf.buf;
1.17 deraadt 109: msg.msg_controllen = sizeof(cmsgbuf.buf);
1.1 provos 110:
1.19 djm 111: pfd.fd = sock;
112: pfd.events = POLLIN;
113: while ((n = recvmsg(sock, &msg, 0)) == -1 &&
114: (errno == EAGAIN || errno == EINTR)) {
1.22 ! djm 115: debug3_f("recvmsg: %s", strerror(errno));
1.19 djm 116: (void)poll(&pfd, 1, -1);
117: }
1.18 dtucker 118: if (n == -1) {
1.22 ! djm 119: error_f("recvmsg: %s", strerror(errno));
1.13 djm 120: return -1;
121: }
122:
123: if (n != 1) {
1.22 ! djm 124: error_f("recvmsg: expected received 1 got %zd", n);
1.13 djm 125: return -1;
126: }
1.1 provos 127:
128: cmsg = CMSG_FIRSTHDR(&msg);
1.13 djm 129: if (cmsg == NULL) {
1.22 ! djm 130: error_f("no message header");
1.13 djm 131: return -1;
132: }
133:
134: if (cmsg->cmsg_type != SCM_RIGHTS) {
1.22 ! djm 135: error_f("expected %d got %d", SCM_RIGHTS, cmsg->cmsg_type);
1.13 djm 136: return -1;
137: }
1.2 stevesk 138: fd = (*(int *)CMSG_DATA(cmsg));
139: return fd;
1.1 provos 140: }
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