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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/wall/ttymsg.c	Lines:	0	70	0.0 %
Date:	2016-12-06	Branches:	0	50	0.0 %


/*	$OpenBSD: ttymsg.c,v 1.17 2015/11/05 22:20:11 benno Exp $	*/
/*	$NetBSD: ttymsg.c,v 1.3 1994/11/17 07:17:55 jtc Exp $	*/

/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <signal.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <paths.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <err.h>

char *ttymsg(struct iovec *, int, char *, int);

/*
 * Display the contents of a uio structure on a terminal.  Used by wall(1)
 * and talkd(8).  Forks and finishes in child if write would block,
 * waiting up to tmout seconds.  Returns pointer to error string on unexpected
 * error; string is not newline-terminated.  Various "normal" errors are
 * ignored (exclusive-use, lack of permission, etc.).
 */
char *
ttymsg(iov, iovcnt, line, tmout)
	struct iovec *iov;
	int iovcnt;
	char *line;
	int tmout;
{
	static char device[MAXNAMLEN] = _PATH_DEV;
	static char errbuf[1024];
	int cnt, fd, left, wret;
	struct iovec localiov[6];
	int forked = 0;
	struct stat st;
	sigset_t mask;

	if (iovcnt > sizeof(localiov) / sizeof(localiov[0]))
		return ("too many iov's (change code in wall/ttymsg.c)");

	/*
	 * Ignore lines that start with "ftp" or "uucp".
	 */
	if ((strncmp(line, "ftp", 3) == 0) ||
	    (strncmp(line, "uucp", 4) == 0))
		return (NULL);

	(void) strlcpy(device + sizeof(_PATH_DEV) - 1, line,
	    sizeof(device) - (sizeof(_PATH_DEV) - 1));
	if (strchr(device + sizeof(_PATH_DEV) - 1, '/')) {
		/* A slash is an attempt to break security... */
		(void) snprintf(errbuf, sizeof(errbuf), "'/' in \"%s\"",
		    device);
		return (errbuf);
	}

	if (getuid()) {
		if (stat(device, &st) < 0)
			return (NULL);
		if ((st.st_mode & S_IWGRP) == 0)
			return (NULL);
	}

	/*
	 * open will fail on slip lines or exclusive-use lines
	 * if not running as root; not an error.
	 */
	if ((fd = open(device, O_WRONLY|O_NONBLOCK, 0)) < 0) {
		if (errno == EBUSY || errno == EACCES)
			return (NULL);
		(void) snprintf(errbuf, sizeof(errbuf),
		    "%s: %s", device, strerror(errno));
		return (errbuf);
	}

	for (cnt = left = 0; cnt < iovcnt; ++cnt)
		left += iov[cnt].iov_len;

	for (;;) {
		wret = writev(fd, iov, iovcnt);
		if (wret >= left)
			break;
		if (wret >= 0) {
			left -= wret;
			if (iov != localiov) {
				bcopy(iov, localiov,
				    iovcnt * sizeof(struct iovec));
				iov = localiov;
			}
			for (cnt = 0; wret >= iov->iov_len; ++cnt) {
				wret -= iov->iov_len;
				++iov;
				--iovcnt;
			}
			if (wret) {
				char *base = iov->iov_base;

				iov->iov_base = base + wret;
				iov->iov_len -= wret;
			}
			continue;
		}
		if (errno == EWOULDBLOCK) {
			int off = 0;
			pid_t cpid;

			if (forked) {
				(void) close(fd);
				_exit(1);
			}
			cpid = fork();
			if (cpid < 0) {
				(void) snprintf(errbuf, sizeof(errbuf),
				    "fork: %s", strerror(errno));
				(void) close(fd);
				return (errbuf);
			}
			if (cpid) {	/* parent */
				(void) close(fd);
				return (NULL);
			}

			if (pledge("stdio wpath cpath rpath", NULL) == -1)
				err(1, "pledge");

			forked++;
			/* wait at most tmout seconds */
			(void) signal(SIGALRM, SIG_DFL);
			(void) signal(SIGTERM, SIG_DFL); /* XXX */
			(void) sigemptyset(&mask);
			(void) sigprocmask(SIG_SETMASK, &mask, NULL);
			(void) alarm((u_int)tmout);
			(void) fcntl(fd, O_NONBLOCK, &off);
			continue;
		}
		/*
		 * We get ENODEV on a slip line if we're running as root,
		 * and EIO if the line just went away.
		 */
		if (errno == ENODEV || errno == EIO)
			break;
		(void) close(fd);
		if (forked)
			_exit(1);
		(void) snprintf(errbuf, sizeof(errbuf),
		    "%s: %s", device, strerror(errno));
		return (errbuf);
	}

	(void) close(fd);
	if (forked)
		_exit(0);
	return (NULL);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: ttymsg.c,v 1.17 2015/11/05 22:20:11 benno Exp $ */
2			/* $NetBSD: ttymsg.c,v 1.3 1994/11/17 07:17:55 jtc Exp $ */
3
4			/*
5			* Copyright (c) 1989, 1993
6			* The Regents of the University of California. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			* 1. Redistributions of source code must retain the above copyright
12			* notice, this list of conditions and the following disclaimer.
13			* 2. Redistributions in binary form must reproduce the above copyright
14			* notice, this list of conditions and the following disclaimer in the
15			* documentation and/or other materials provided with the distribution.
16			* 3. Neither the name of the University nor the names of its contributors
17			* may be used to endorse or promote products derived from this software
18			* without specific prior written permission.
19			*
20			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30			* SUCH DAMAGE.
31			*/
32
33			#include <sys/types.h>
34			#include <sys/stat.h>
35			#include <sys/uio.h>
36			#include <signal.h>
37			#include <fcntl.h>
38			#include <dirent.h>
39			#include <errno.h>
40			#include <paths.h>
41			#include <unistd.h>
42			#include <stdio.h>
43			#include <string.h>
44			#include <stdlib.h>
45			#include <err.h>
46
47			char ttymsg(struct iovec , int, char *, int);
48
49			/*
50			* Display the contents of a uio structure on a terminal. Used by wall(1)
51			* and talkd(8). Forks and finishes in child if write would block,
52			* waiting up to tmout seconds. Returns pointer to error string on unexpected
53			* error; string is not newline-terminated. Various "normal" errors are
54			* ignored (exclusive-use, lack of permission, etc.).
55			*/
56			char *
57			ttymsg(iov, iovcnt, line, tmout)
58			struct iovec *iov;
59			int iovcnt;
60			char *line;
61			int tmout;
62			{
63			static char device[MAXNAMLEN] = _PATH_DEV;
64			static char errbuf[1024];
65			int cnt, fd, left, wret;
66			struct iovec localiov[6];
67			int forked = 0;
68			struct stat st;
69			sigset_t mask;
70
71			if (iovcnt > sizeof(localiov) / sizeof(localiov[0]))
72			return ("too many iov's (change code in wall/ttymsg.c)");
73
74			/*
75			* Ignore lines that start with "ftp" or "uucp".
76			*/
77			if ((strncmp(line, "ftp", 3) == 0) \|\|
78			(strncmp(line, "uucp", 4) == 0))
79			return (NULL);
80
81			(void) strlcpy(device + sizeof(_PATH_DEV) - 1, line,
82			sizeof(device) - (sizeof(_PATH_DEV) - 1));
83			if (strchr(device + sizeof(_PATH_DEV) - 1, '/')) {
84			/* A slash is an attempt to break security... */
85			(void) snprintf(errbuf, sizeof(errbuf), "'/' in \"%s\"",
86			device);
87			return (errbuf);
88			}
89
90			if (getuid()) {
91			if (stat(device, &st) < 0)
92			return (NULL);
93			if ((st.st_mode & S_IWGRP) == 0)
94			return (NULL);
95			}
96
97			/*
98			* open will fail on slip lines or exclusive-use lines
99			* if not running as root; not an error.
100			*/
101			if ((fd = open(device, O_WRONLY\|O_NONBLOCK, 0)) < 0) {
102			if (errno == EBUSY \|\| errno == EACCES)
103			return (NULL);
104			(void) snprintf(errbuf, sizeof(errbuf),
105			"%s: %s", device, strerror(errno));
106			return (errbuf);
107			}
108
109			for (cnt = left = 0; cnt < iovcnt; ++cnt)
110			left += iov[cnt].iov_len;
111
112			for (;;) {
113			wret = writev(fd, iov, iovcnt);
114			if (wret >= left)
115			break;
116			if (wret >= 0) {
117			left -= wret;
118			if (iov != localiov) {
119			bcopy(iov, localiov,
120			iovcnt * sizeof(struct iovec));
121			iov = localiov;
122			}
123			for (cnt = 0; wret >= iov->iov_len; ++cnt) {
124			wret -= iov->iov_len;
125			++iov;
126			--iovcnt;
127			}
128			if (wret) {
129			char *base = iov->iov_base;
130
131			iov->iov_base = base + wret;
132			iov->iov_len -= wret;
133			}
134			continue;
135			}
136			if (errno == EWOULDBLOCK) {
137			int off = 0;
138			pid_t cpid;
139
140			if (forked) {
141			(void) close(fd);
142			_exit(1);
143			}
144			cpid = fork();
145			if (cpid < 0) {
146			(void) snprintf(errbuf, sizeof(errbuf),
147			"fork: %s", strerror(errno));
148			(void) close(fd);
149			return (errbuf);
150			}
151			if (cpid) { /* parent */
152			(void) close(fd);
153			return (NULL);
154			}
155
156			if (pledge("stdio wpath cpath rpath", NULL) == -1)
157			err(1, "pledge");
158
159			forked++;
160			/* wait at most tmout seconds */
161			(void) signal(SIGALRM, SIG_DFL);
162			(void) signal(SIGTERM, SIG_DFL); /* XXX */
163			(void) sigemptyset(&mask);
164			(void) sigprocmask(SIG_SETMASK, &mask, NULL);
165			(void) alarm((u_int)tmout);
166			(void) fcntl(fd, O_NONBLOCK, &off);
167			continue;
168			}
169			/*
170			* We get ENODEV on a slip line if we're running as root,
171			* and EIO if the line just went away.
172			*/
173			if (errno == ENODEV \|\| errno == EIO)
174			break;
175			(void) close(fd);
176			if (forked)
177			_exit(1);
178			(void) snprintf(errbuf, sizeof(errbuf),
179			"%s: %s", device, strerror(errno));
180			return (errbuf);
181			}
182
183			(void) close(fd);
184			if (forked)
185			_exit(0);
186			return (NULL);
187			}