OpenCoverage

monitor_fdpass.c

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/openssh/src/monitor_fdpass.c
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1/* $OpenBSD: monitor_fdpass.c,v 1.21 2016/02/29 20:22:36 jca Exp $ */-
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-
27#include "includes.h"-
28-
29#include <sys/types.h>-
30#include <sys/socket.h>-
31#include <sys/uio.h>-
32#ifdef HAVE_SYS_UN_H-
33#include <sys/un.h>-
34#endif-
35-
36#include <errno.h>-
37#include <string.h>-
38#include <stdarg.h>-
39-
40#ifdef HAVE_POLL_H-
41# include <poll.h>-
42#else-
43# ifdef HAVE_SYS_POLL_H-
44# include <sys/poll.h>-
45# endif-
46#endif-
47-
48#include "log.h"-
49#include "monitor_fdpass.h"-
50-
51int-
52mm_send_fd(int sock, int fd)-
53{-
54#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))-
55 struct msghdr msg;-
56#ifndef HAVE_ACCRIGHTS_IN_MSGHDR-
57 union {-
58 struct cmsghdr hdr;-
59 char buf[CMSG_SPACE(sizeof(int))];-
60 } cmsgbuf;-
61 struct cmsghdr *cmsg;-
62#endif-
63 struct iovec vec;-
64 char ch = '\0';-
65 ssize_t n;-
66 struct pollfd pfd;-
67-
68 memset(&msg, 0, sizeof(msg));-
69#ifdef HAVE_ACCRIGHTS_IN_MSGHDR-
70 msg.msg_accrights = (caddr_t)&fd;-
71 msg.msg_accrightslen = sizeof(fd);-
72#else-
73 memset(&cmsgbuf, 0, sizeof(cmsgbuf));-
74 msg.msg_control = (caddr_t)&cmsgbuf.buf;-
75 msg.msg_controllen = sizeof(cmsgbuf.buf);-
76 cmsg = CMSG_FIRSTHDR(&msg);
(size_t) ( &ms...truct cmsghdr)Description
TRUEnever evaluated
FALSEnever evaluated
0
77 cmsg->cmsg_len = CMSG_LEN(sizeof(int));-
78 cmsg->cmsg_level = SOL_SOCKET;-
79 cmsg->cmsg_type = SCM_RIGHTS;-
80 *(int *)CMSG_DATA(cmsg) = fd;-
81#endif-
82-
83 vec.iov_base = &ch;-
84 vec.iov_len = 1;-
85 msg.msg_iov = &vec;-
86 msg.msg_iovlen = 1;-
87-
88 pfd.fd = sock;-
89 pfd.events = POLLOUT;-
90 while ((n = sendmsg(sock, &msg, 0)) == -1 &&
(n = sendmsg(s...msg, 0)) == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
91 (errno == EAGAIN || errno == EINTR)) {
(*__errno_location ()) == 11Description
TRUEnever evaluated
FALSEnever evaluated
(*__errno_location ()) == 4Description
TRUEnever evaluated
FALSEnever evaluated
0
92 debug3("%s: sendmsg(%d): %s", __func__, fd, strerror(errno));-
93 (void)poll(&pfd, 1, -1);-
94 }
never executed: end of block
0
95 if (n == -1) {
n == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
96 error("%s: sendmsg(%d): %s", __func__, fd,-
97 strerror(errno));-
98 return -1;
never executed: return -1;
0
99 }-
100-
101 if (n != 1) {
n != 1Description
TRUEnever evaluated
FALSEnever evaluated
0
102 error("%s: sendmsg: expected sent 1 got %zd", __func__, n);-
103 return -1;
never executed: return -1;
0
104 }-
105 return 0;
never executed: return 0;
0
106#else-
107 error("%s: file descriptor passing not supported", __func__);-
108 return -1;-
109#endif-
110}-
111-
112int-
113mm_receive_fd(int sock)-
114{-
115#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))-
116 struct msghdr msg;-
117#ifndef HAVE_ACCRIGHTS_IN_MSGHDR-
118 union {-
119 struct cmsghdr hdr;-
120 char buf[CMSG_SPACE(sizeof(int))];-
121 } cmsgbuf;-
122 struct cmsghdr *cmsg;-
123#endif-
124 struct iovec vec;-
125 ssize_t n;-
126 char ch;-
127 int fd;-
128 struct pollfd pfd;-
129-
130 memset(&msg, 0, sizeof(msg));-
131 vec.iov_base = &ch;-
132 vec.iov_len = 1;-
133 msg.msg_iov = &vec;-
134 msg.msg_iovlen = 1;-
135#ifdef HAVE_ACCRIGHTS_IN_MSGHDR-
136 msg.msg_accrights = (caddr_t)&fd;-
137 msg.msg_accrightslen = sizeof(fd);-
138#else-
139 memset(&cmsgbuf, 0, sizeof(cmsgbuf));-
140 msg.msg_control = &cmsgbuf.buf;-
141 msg.msg_controllen = sizeof(cmsgbuf.buf);-
142#endif-
143-
144 pfd.fd = sock;-
145 pfd.events = POLLIN;-
146 while ((n = recvmsg(sock, &msg, 0)) == -1 &&
(n = recvmsg(s...msg, 0)) == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
147 (errno == EAGAIN || errno == EINTR)) {
(*__errno_location ()) == 11Description
TRUEnever evaluated
FALSEnever evaluated
(*__errno_location ()) == 4Description
TRUEnever evaluated
FALSEnever evaluated
0
148 debug3("%s: recvmsg: %s", __func__, strerror(errno));-
149 (void)poll(&pfd, 1, -1);-
150 }
never executed: end of block
0
151 if (n == -1) {
n == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
152 error("%s: recvmsg: %s", __func__, strerror(errno));-
153 return -1;
never executed: return -1;
0
154 }-
155-
156 if (n != 1) {
n != 1Description
TRUEnever evaluated
FALSEnever evaluated
0
157 error("%s: recvmsg: expected received 1 got %zd", __func__, n);-
158 return -1;
never executed: return -1;
0
159 }-
160-
161#ifdef HAVE_ACCRIGHTS_IN_MSGHDR-
162 if (msg.msg_accrightslen != sizeof(fd)) {-
163 error("%s: no fd", __func__);-
164 return -1;-
165 }-
166#else-
167 cmsg = CMSG_FIRSTHDR(&msg);
(size_t) ( &ms...truct cmsghdr)Description
TRUEnever evaluated
FALSEnever evaluated
0
168 if (cmsg == NULL) {
cmsg == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
169 error("%s: no message header", __func__);-
170 return -1;
never executed: return -1;
0
171 }-
172-
173#ifndef BROKEN_CMSG_TYPE-
174 if (cmsg->cmsg_type != SCM_RIGHTS) {
cmsg->cmsg_type != SCM_RIGHTSDescription
TRUEnever evaluated
FALSEnever evaluated
0
175 error("%s: expected type %d got %d", __func__,-
176 SCM_RIGHTS, cmsg->cmsg_type);-
177 return -1;
never executed: return -1;
0
178 }-
179#endif-
180 fd = (*(int *)CMSG_DATA(cmsg));-
181#endif-
182 return fd;
never executed: return fd;
0
183#else-
184 error("%s: file descriptor passing not supported", __func__);-
185 return -1;-
186#endif-
187}-
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