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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/syslogd/ttymsg.c	Lines:	0	81	0.0 %
Date:	2017-11-07	Branches:	0	60	0.0 %


/*	$OpenBSD: ttymsg.c,v 1.16 2017/08/08 14:23:23 bluhm 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/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 1.16 2017/08/08 14:23:23 bluhm 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/stat.h>
34			#include <sys/syslog.h>
35
36			#include <dirent.h>
37			#include <errno.h>
38			#include <event.h>
39			#include <paths.h>
40			#include <signal.h>
41			#include <stdio.h>
42			#include <stdlib.h>
43			#include <string.h>
44			#include <unistd.h>
45
46			#include "log.h"
47			#include "syslogd.h"
48
49			#ifndef nitems
50			#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
51			#endif
52
53			struct tty_delay {
54			struct event td_event;
55			size_t td_length;
56			char td_line[LOG_MAXLINE];
57			};
58			int tty_delayed = 0;
59			void ttycb(int, short, void *);
60
61			/*
62			* Display the contents of a uio structure on a terminal.
63			* Schedules an event if write would block, waiting up to TTYMSGTIME
64			* seconds.
65			*/
66			void
67			ttymsg(struct iovec iov, int iovcnt, char utline)
68			{
69			static char device[MAXNAMLEN] = _PATH_DEV;
70			int cnt, fd;
71			size_t left;
72			ssize_t wret;
73			struct iovec localiov[6];
74
75			if (iovcnt < 0 \|\| (size_t)iovcnt > nitems(localiov)) {
76			log_warnx("too many iov's (change code in syslogd/ttymsg.c)");
77			return;
78			}
79
80			/*
81			* Ignore lines that start with "ftp" or "uucp".
82			*/
83			if ((strncmp(utline, "ftp", 3) == 0) \|\|
84			(strncmp(utline, "uucp", 4) == 0))
85			return;
86
87			(void) strlcpy(device + sizeof(_PATH_DEV) - 1, utline,
88			sizeof(device) - (sizeof(_PATH_DEV) - 1));
89			if (strchr(device + sizeof(_PATH_DEV) - 1, '/')) {
90			/* A slash is an attempt to break security... */
91			log_warnx("'/' in tty device \"%s\"", device);
92			return;
93			}
94
95			/*
96			* open will fail on slip lines or exclusive-use lines
97			* if not running as root; not an error.
98			*/
99			if ((fd = priv_open_tty(device)) < 0) {
100			if (errno != EBUSY && errno != EACCES)
101			log_warn("priv_open_tty device \"%s\"", device);
102			return;
103			}
104
105			left = 0;
106			for (cnt = 0; cnt < iovcnt; ++cnt)
107			left += iov[cnt].iov_len;
108
109			for (;;) {
110			wret = writev(fd, iov, iovcnt);
111			if (wret >= 0) {
112			if ((size_t)wret >= left)
113			break;
114			left -= wret;
115			if (iov != localiov) {
116			memmove(localiov, iov,
117			iovcnt * sizeof(struct iovec));
118			iov = localiov;
119			}
120			while ((size_t)wret >= iov->iov_len) {
121			wret -= iov->iov_len;
122			++iov;
123			--iovcnt;
124			}
125			if (wret) {
126			iov->iov_base = (char *)iov->iov_base + wret;
127			iov->iov_len -= wret;
128			}
129			continue;
130			}
131			if (errno == EWOULDBLOCK) {
132			struct tty_delay *td;
133			struct timeval to;
134
135			if (tty_delayed >= TTYMAXDELAY) {
136			log_warnx("tty device \"%s\": %s",
137			device, "too many delayed writes");
138			break;
139			}
140			log_debug("ttymsg delayed write");
141			if (iov != localiov) {
142			memmove(localiov, iov,
143			iovcnt * sizeof(struct iovec));
144			iov = localiov;
145			}
146			if ((td = malloc(sizeof(*td))) == NULL) {
147			log_warn("allocate delay tty device \"%s\"",
148			device);
149			break;
150			}
151			td->td_length = 0;
152			if (left > LOG_MAXLINE)
153			left = LOG_MAXLINE;
154			while (iovcnt && left) {
155			if (iov->iov_len > left)
156			iov->iov_len = left;
157			memcpy(td->td_line + td->td_length,
158			iov->iov_base, iov->iov_len);
159			td->td_length += iov->iov_len;
160			left -= iov->iov_len;
161			++iov;
162			--iovcnt;
163			}
164			tty_delayed++;
165			event_set(&td->td_event, fd, EV_WRITE, ttycb, td);
166			to.tv_sec = TTYMSGTIME;
167			to.tv_usec = 0;
168			event_add(&td->td_event, &to);
169			return;
170			}
171			/*
172			* We get ENODEV on a slip line if we're running as root,
173			* and EIO if the line just went away.
174			*/
175			if (errno != ENODEV && errno != EIO)
176			log_warn("writev tty device \"%s\"", device);
177			break;
178			}
179
180			(void) close(fd);
181			return;
182			}
183
184			void
185			ttycb(int fd, short event, void *arg)
186			{
187			struct tty_delay *td = arg;
188			struct timeval to;
189			ssize_t wret;
190
191			if (event != EV_WRITE)
192			goto done;
193
194			wret = write(fd, td->td_line, td->td_length);
195			if (wret < 0 && errno != EINTR && errno != EWOULDBLOCK)
196			goto done;
197			if (wret > 0) {
198			td->td_length -= wret;
199			if (td->td_length == 0)
200			goto done;
201			memmove(td->td_line, td->td_line + wret, td->td_length);
202			}
203			to.tv_sec = TTYMSGTIME;
204			to.tv_usec = 0;
205			event_add(&td->td_event, &to);
206			return;
207
208			done:
209			tty_delayed--;
210			close(fd);
211			free(td);
212			}