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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/syslogd/ttymsg.c	Lines:	0	83	0.0 %
Date:	2017-11-13	Branches:	0	60	0.0 %


/*	$OpenBSD: ttymsg.c,v 1.17 2017/10/05 16:15:24 bluhm Exp $	*/
/*	$NetBSD: ttymsg.c,v 1.3 1994/11/17 07:17:55 jtc Exp $	*/

/*
 * Copyright (c) 2014-2017 Alexander Bluhm <bluhm@genua.de>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * 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/stat.h>
#include <sys/syslog.h>

#include <dirent.h>
#include <errno.h>
#include <event.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "log.h"
#include "syslogd.h"

#ifndef nitems
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
#endif

struct tty_delay {
	struct event	 td_event;
	size_t		 td_length;
	char		 td_line[LOG_MAXLINE];
};
int tty_delayed = 0;
void ttycb(int, short, void *);

/*
 * Display the contents of a uio structure on a terminal.
 * Schedules an event if write would block, waiting up to TTYMSGTIME
 * seconds.
 */
void
ttymsg(struct iovec *iov, int iovcnt, char *utline)
{
	static char device[MAXNAMLEN] = _PATH_DEV;
	int cnt, fd;
	size_t left;
	ssize_t wret;
	struct iovec localiov[6];

	if (iovcnt < 0 || (size_t)iovcnt > nitems(localiov)) {
		log_warnx("too many iov's (change code in syslogd/ttymsg.c)");
		return;
	}

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

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

	/*
	 * open will fail on slip lines or exclusive-use lines
	 * if not running as root; not an error.
	 */
	if ((fd = priv_open_tty(device)) < 0) {
		if (errno != EBUSY && errno != EACCES)
			log_warn("priv_open_tty device \"%s\"", device);
		return;
	}

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

	for (;;) {
		wret = writev(fd, iov, iovcnt);
		if (wret >= 0) {
			if ((size_t)wret >= left)
				break;
			left -= wret;
			if (iov != localiov) {
				memmove(localiov, iov,
				    iovcnt * sizeof(struct iovec));
				iov = localiov;
			}
			while ((size_t)wret >= iov->iov_len) {
				wret -= iov->iov_len;
				++iov;
				--iovcnt;
			}
			if (wret) {
				iov->iov_base = (char *)iov->iov_base + wret;
				iov->iov_len -= wret;
			}
			continue;
		}
		if (errno == EWOULDBLOCK) {
			struct tty_delay	*td;
			struct timeval		 to;

			if (tty_delayed >= TTYMAXDELAY) {
				log_warnx("tty device \"%s\": %s",
				    device, "too many delayed writes");
				break;
			}
			log_debug("ttymsg delayed write");
			if (iov != localiov) {
				memmove(localiov, iov,
				    iovcnt * sizeof(struct iovec));
				iov = localiov;
			}
			if ((td = malloc(sizeof(*td))) == NULL) {
				log_warn("allocate delay tty device \"%s\"",
				    device);
				break;
			}
			td->td_length = 0;
			if (left > LOG_MAXLINE)
				left = LOG_MAXLINE;
			while (iovcnt && left) {
				if (iov->iov_len > left)
					iov->iov_len = left;
				memcpy(td->td_line + td->td_length,
				    iov->iov_base, iov->iov_len);
				td->td_length += iov->iov_len;
				left -= iov->iov_len;
				++iov;
				--iovcnt;
			}
			tty_delayed++;
			event_set(&td->td_event, fd, EV_WRITE, ttycb, td);
			to.tv_sec = TTYMSGTIME;
			to.tv_usec = 0;
			event_add(&td->td_event, &to);
			return;
		}
		/*
		 * 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)
			log_warn("writev tty device \"%s\"", device);
		break;
	}

	(void) close(fd);
	return;
}

void
ttycb(int fd, short event, void *arg)
{
	struct tty_delay	*td = arg;
	struct timeval		 to;
	ssize_t			 wret;

	if (event != EV_WRITE)
		goto done;

	wret = write(fd, td->td_line, td->td_length);
	if (wret < 0 && errno != EINTR && errno != EWOULDBLOCK)
		goto done;
	if (wret > 0) {
		td->td_length -= wret;
		if (td->td_length == 0)
			goto done;
		memmove(td->td_line, td->td_line + wret, td->td_length);
	}
	to.tv_sec = TTYMSGTIME;
	to.tv_usec = 0;
	event_add(&td->td_event, &to);
	return;

 done:
	tty_delayed--;
	close(fd);
	free(td);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: ttymsg.c,v 1.17 2017/10/05 16:15:24 bluhm Exp $ */
2			/* $NetBSD: ttymsg.c,v 1.3 1994/11/17 07:17:55 jtc Exp $ */
3
4			/*
5			* Copyright (c) 2014-2017 Alexander Bluhm <bluhm@genua.de>
6			*
7			* Permission to use, copy, modify, and distribute this software for any
8			* purpose with or without fee is hereby granted, provided that the above
9			* copyright notice and this permission notice appear in all copies.
10			*
11			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18			*/
19
20			/*
21			* Copyright (c) 1989, 1993
22			* The Regents of the University of California. All rights reserved.
23			*
24			* Redistribution and use in source and binary forms, with or without
25			* modification, are permitted provided that the following conditions
26			* are met:
27			* 1. Redistributions of source code must retain the above copyright
28			* notice, this list of conditions and the following disclaimer.
29			* 2. Redistributions in binary form must reproduce the above copyright
30			* notice, this list of conditions and the following disclaimer in the
31			* documentation and/or other materials provided with the distribution.
32			* 3. Neither the name of the University nor the names of its contributors
33			* may be used to endorse or promote products derived from this software
34			* without specific prior written permission.
35			*
36			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
37			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
39			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
40			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
41			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
42			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
44			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
45			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46			* SUCH DAMAGE.
47			*/
48
49			#include <sys/stat.h>
50			#include <sys/syslog.h>
51
52			#include <dirent.h>
53			#include <errno.h>
54			#include <event.h>
55			#include <paths.h>
56			#include <signal.h>
57			#include <stdio.h>
58			#include <stdlib.h>
59			#include <string.h>
60			#include <unistd.h>
61
62			#include "log.h"
63			#include "syslogd.h"
64
65			#ifndef nitems
66			#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
67			#endif
68
69			struct tty_delay {
70			struct event td_event;
71			size_t td_length;
72			char td_line[LOG_MAXLINE];
73			};
74			int tty_delayed = 0;
75			void ttycb(int, short, void *);
76
77			/*
78			* Display the contents of a uio structure on a terminal.
79			* Schedules an event if write would block, waiting up to TTYMSGTIME
80			* seconds.
81			*/
82			void
83			ttymsg(struct iovec iov, int iovcnt, char utline)
84			{
85			static char device[MAXNAMLEN] = _PATH_DEV;
86			int cnt, fd;
87			size_t left;
88			ssize_t wret;
89			struct iovec localiov[6];
90
91			if (iovcnt < 0 \|\| (size_t)iovcnt > nitems(localiov)) {
92			log_warnx("too many iov's (change code in syslogd/ttymsg.c)");
93			return;
94			}
95
96			/*
97			* Ignore lines that start with "ftp" or "uucp".
98			*/
99			if ((strncmp(utline, "ftp", 3) == 0) \|\|
100			(strncmp(utline, "uucp", 4) == 0))
101			return;
102
103			(void) strlcpy(device + sizeof(_PATH_DEV) - 1, utline,
104			sizeof(device) - (sizeof(_PATH_DEV) - 1));
105			if (strchr(device + sizeof(_PATH_DEV) - 1, '/')) {
106			/* A slash is an attempt to break security... */
107			log_warnx("'/' in tty device \"%s\"", device);
108			return;
109			}
110
111			/*
112			* open will fail on slip lines or exclusive-use lines
113			* if not running as root; not an error.
114			*/
115			if ((fd = priv_open_tty(device)) < 0) {
116			if (errno != EBUSY && errno != EACCES)
117			log_warn("priv_open_tty device \"%s\"", device);
118			return;
119			}
120
121			left = 0;
122			for (cnt = 0; cnt < iovcnt; ++cnt)
123			left += iov[cnt].iov_len;
124
125			for (;;) {
126			wret = writev(fd, iov, iovcnt);
127			if (wret >= 0) {
128			if ((size_t)wret >= left)
129			break;
130			left -= wret;
131			if (iov != localiov) {
132			memmove(localiov, iov,
133			iovcnt * sizeof(struct iovec));
134			iov = localiov;
135			}
136			while ((size_t)wret >= iov->iov_len) {
137			wret -= iov->iov_len;
138			++iov;
139			--iovcnt;
140			}
141			if (wret) {
142			iov->iov_base = (char *)iov->iov_base + wret;
143			iov->iov_len -= wret;
144			}
145			continue;
146			}
147			if (errno == EWOULDBLOCK) {
148			struct tty_delay *td;
149			struct timeval to;
150
151			if (tty_delayed >= TTYMAXDELAY) {
152			log_warnx("tty device \"%s\": %s",
153			device, "too many delayed writes");
154			break;
155			}
156			log_debug("ttymsg delayed write");
157			if (iov != localiov) {
158			memmove(localiov, iov,
159			iovcnt * sizeof(struct iovec));
160			iov = localiov;
161			}
162			if ((td = malloc(sizeof(*td))) == NULL) {
163			log_warn("allocate delay tty device \"%s\"",
164			device);
165			break;
166			}
167			td->td_length = 0;
168			if (left > LOG_MAXLINE)
169			left = LOG_MAXLINE;
170			while (iovcnt && left) {
171			if (iov->iov_len > left)
172			iov->iov_len = left;
173			memcpy(td->td_line + td->td_length,
174			iov->iov_base, iov->iov_len);
175			td->td_length += iov->iov_len;
176			left -= iov->iov_len;
177			++iov;
178			--iovcnt;
179			}
180			tty_delayed++;
181			event_set(&td->td_event, fd, EV_WRITE, ttycb, td);
182			to.tv_sec = TTYMSGTIME;
183			to.tv_usec = 0;
184			event_add(&td->td_event, &to);
185			return;
186			}
187			/*
188			* We get ENODEV on a slip line if we're running as root,
189			* and EIO if the line just went away.
190			*/
191			if (errno != ENODEV && errno != EIO)
192			log_warn("writev tty device \"%s\"", device);
193			break;
194			}
195
196			(void) close(fd);
197			return;
198			}
199
200			void
201			ttycb(int fd, short event, void *arg)
202			{
203			struct tty_delay *td = arg;
204			struct timeval to;
205			ssize_t wret;
206
207			if (event != EV_WRITE)
208			goto done;
209
210			wret = write(fd, td->td_line, td->td_length);
211			if (wret < 0 && errno != EINTR && errno != EWOULDBLOCK)
212			goto done;
213			if (wret > 0) {
214			td->td_length -= wret;
215			if (td->td_length == 0)
216			goto done;
217			memmove(td->td_line, td->td_line + wret, td->td_length);
218			}
219			to.tv_sec = TTYMSGTIME;
220			to.tv_usec = 0;
221			event_add(&td->td_event, &to);
222			return;
223
224			done:
225			tty_delayed--;
226			close(fd);
227			free(td);
228			}