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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	sbin/dmesg/dmesg.c	Lines:	37	78	47.4 %
Date:	2016-12-06	Branches:	20	62	32.3 %


/*	$OpenBSD: dmesg.c,v 1.27 2015/10/09 01:37:06 deraadt Exp $	*/
/*	$NetBSD: dmesg.c,v 1.8 1995/03/18 14:54:49 cgd Exp $	*/

/*-
 * Copyright (c) 1991, 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/msgbuf.h>
#include <sys/sysctl.h>

#include <err.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <nlist.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <vis.h>

#ifndef NOKVM
struct nlist nl[] = {
#define	X_MSGBUF	0
	{ "_msgbufp" },
	{ NULL },
};
#endif

void usage(void);

#define	KREAD(addr, var) \
	kvm_read(kd, addr, &var, sizeof(var)) != sizeof(var)

int
main(int argc, char *argv[])
{
	int ch, newl, skip, i;
	char *p;
	struct msgbuf cur;
	char *memf, *nlistf, *bufdata = NULL;
	int startupmsgs = 0;
	char buf[5];

	memf = nlistf = NULL;
	while ((ch = getopt(argc, argv, "sM:N:")) != -1)
		switch(ch) {
		case 's':
			startupmsgs = 1;
			break;
		case 'M':
			memf = optarg;
			break;
		case 'N':
			nlistf = optarg;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (memf == NULL && nlistf == NULL) {
		int mib[2], msgbufsize;
		size_t len;

		mib[0] = CTL_KERN;
		mib[1] = startupmsgs ? KERN_CONSBUFSIZE : KERN_MSGBUFSIZE;
		len = sizeof(msgbufsize);
		if (sysctl(mib, 2, &msgbufsize, &len, NULL, 0))
			err(1, "sysctl: KERN_MSGBUFSIZE");

		msgbufsize += sizeof(struct msgbuf) - 1;
		bufdata = calloc(1, msgbufsize);
		if (bufdata == NULL)
			errx(1, "couldn't allocate space for buffer data");

		mib[1] = startupmsgs ? KERN_CONSBUF : KERN_MSGBUF;
		len = msgbufsize;
		if (sysctl(mib, 2, bufdata, &len, NULL, 0))
			err(1, "sysctl: KERN_MSGBUF");

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

		memcpy(&cur, bufdata, sizeof(cur));
		bufdata = ((struct msgbuf *)bufdata)->msg_bufc;
	} else {
#ifndef NOKVM
		struct msgbuf *bufp;
		kvm_t *kd;

		/* Read in kernel message buffer, do sanity checks. */
		if ((kd = kvm_open(nlistf, memf, NULL, O_RDONLY,
		    "dmesg")) == NULL)
			return (1);

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

		if (kvm_nlist(kd, nl) == -1)
			errx(1, "kvm_nlist: %s", kvm_geterr(kd));
		if (nl[X_MSGBUF].n_type == 0)
			errx(1, "%s: msgbufp not found",
			    nlistf ? nlistf : "namelist");
		if (KREAD(nl[X_MSGBUF].n_value, bufp))
			errx(1, "kvm_read: %s: (0x%lx)", kvm_geterr(kd),
			    nl[X_MSGBUF].n_value);
		if (KREAD((long)bufp, cur))
			errx(1, "kvm_read: %s (%0lx)", kvm_geterr(kd),
			    (unsigned long)bufp);
		if (cur.msg_magic != MSG_MAGIC)
			errx(1, "magic number incorrect");
		bufdata = malloc(cur.msg_bufs);
		if (bufdata == NULL)
			errx(1, "couldn't allocate space for buffer data");
		if (kvm_read(kd, (long)&bufp->msg_bufc, bufdata,
		    cur.msg_bufs) != cur.msg_bufs)
			errx(1, "kvm_read: %s", kvm_geterr(kd));
		kvm_close(kd);
#endif
	}

	if (cur.msg_bufx >= cur.msg_bufs)
		cur.msg_bufx = 0;
	/*
	 * The message buffer is circular; start at the read pointer, and
	 * go to the write pointer - 1.
	 */
	for (newl = skip = i = 0, p = bufdata + cur.msg_bufx;
	    i < cur.msg_bufs; i++, p++) {
		if (p == bufdata + cur.msg_bufs)
			p = bufdata;
		ch = *p;
		/* Skip "\n<.*>" syslog sequences. */
		if (skip) {
			if (ch == '>')
				newl = skip = 0;
			continue;
		}
		if (newl && ch == '<') {
			skip = 1;
			continue;
		}
		if (ch == '\0')
			continue;
		newl = ch == '\n';
		vis(buf, ch, 0, 0);
		if (buf[1] == 0)
			putchar(buf[0]);
		else
			printf("%s", buf);
	}
	if (!newl)
		putchar('\n');
	return (0);
}

void
usage(void)
{
	extern char *__progname;

	fprintf(stderr, "usage: %s [-s] [-M core] [-N system]\n", __progname);
	exit(1);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: dmesg.c,v 1.27 2015/10/09 01:37:06 deraadt Exp $ */
2			/* $NetBSD: dmesg.c,v 1.8 1995/03/18 14:54:49 cgd Exp $ */
3
4			/*-
5			* Copyright (c) 1991, 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/msgbuf.h>
35			#include <sys/sysctl.h>
36
37			#include <err.h>
38			#include <fcntl.h>
39			#include <kvm.h>
40			#include <limits.h>
41			#include <nlist.h>
42			#include <stdio.h>
43			#include <stdlib.h>
44			#include <string.h>
45			#include <time.h>
46			#include <unistd.h>
47			#include <vis.h>
48
49			#ifndef NOKVM
50			struct nlist nl[] = {
51			#define X_MSGBUF 0
52			{ "_msgbufp" },
53			{ NULL },
54			};
55			#endif
56
57			void usage(void);
58
59			#define KREAD(addr, var) \
60			kvm_read(kd, addr, &var, sizeof(var)) != sizeof(var)
61
62			int
63			main(int argc, char *argv[])
64		2	{
65			int ch, newl, skip, i;
66			char *p;
67			struct msgbuf cur;
68		2	char memf, nlistf, *bufdata = NULL;
69		2	int startupmsgs = 0;
70			char buf[5];
71
72		2	memf = nlistf = NULL;
73	✗✓	4	while ((ch = getopt(argc, argv, "sM:N:")) != -1)
74			switch(ch) {
75			case 's':
76			startupmsgs = 1;
77			break;
78			case 'M':
79			memf = optarg;
80			break;
81			case 'N':
82			nlistf = optarg;
83			break;
84			case '?':
85			default:
86			usage();
87			}
88		2	argc -= optind;
89		2	argv += optind;
90
91	✓✗	2	if (memf == NULL && nlistf == NULL) {
92			int mib[2], msgbufsize;
93			size_t len;
94
95		2	mib[0] = CTL_KERN;
96	✗✓	2	mib[1] = startupmsgs ? KERN_CONSBUFSIZE : KERN_MSGBUFSIZE;
97		2	len = sizeof(msgbufsize);
98	✗✓	2	if (sysctl(mib, 2, &msgbufsize, &len, NULL, 0))
99			err(1, "sysctl: KERN_MSGBUFSIZE");
100
101		2	msgbufsize += sizeof(struct msgbuf) - 1;
102		2	bufdata = calloc(1, msgbufsize);
103	✗✓	2	if (bufdata == NULL)
104			errx(1, "couldn't allocate space for buffer data");
105
106	✗✓	2	mib[1] = startupmsgs ? KERN_CONSBUF : KERN_MSGBUF;
107		2	len = msgbufsize;
108	✗✓	2	if (sysctl(mib, 2, bufdata, &len, NULL, 0))
109			err(1, "sysctl: KERN_MSGBUF");
110
111	✗✓	2	if (pledge("stdio rpath cpath wpath", NULL) == -1)
112			err(1, "pledge");
113
114		2	memcpy(&cur, bufdata, sizeof(cur));
115		2	bufdata = ((struct msgbuf *)bufdata)->msg_bufc;
116			} else {
117			#ifndef NOKVM
118			struct msgbuf *bufp;
119			kvm_t *kd;
120
121			/* Read in kernel message buffer, do sanity checks. */
122			if ((kd = kvm_open(nlistf, memf, NULL, O_RDONLY,
123			"dmesg")) == NULL)
124			return (1);
125
126			if (pledge("stdio rpath cpath wpath", NULL) == -1)
127			err(1, "pledge");
128
129			if (kvm_nlist(kd, nl) == -1)
130			errx(1, "kvm_nlist: %s", kvm_geterr(kd));
131			if (nl[X_MSGBUF].n_type == 0)
132			errx(1, "%s: msgbufp not found",
133			nlistf ? nlistf : "namelist");
134			if (KREAD(nl[X_MSGBUF].n_value, bufp))
135			errx(1, "kvm_read: %s: (0x%lx)", kvm_geterr(kd),
136			nl[X_MSGBUF].n_value);
137			if (KREAD((long)bufp, cur))
138			errx(1, "kvm_read: %s (%0lx)", kvm_geterr(kd),
139			(unsigned long)bufp);
140			if (cur.msg_magic != MSG_MAGIC)
141			errx(1, "magic number incorrect");
142			bufdata = malloc(cur.msg_bufs);
143			if (bufdata == NULL)
144			errx(1, "couldn't allocate space for buffer data");
145			if (kvm_read(kd, (long)&bufp->msg_bufc, bufdata,
146			cur.msg_bufs) != cur.msg_bufs)
147			errx(1, "kvm_read: %s", kvm_geterr(kd));
148			kvm_close(kd);
149			#endif
150			}
151
152	✗✓	2	if (cur.msg_bufx >= cur.msg_bufs)
153			cur.msg_bufx = 0;
154			/*
155			* The message buffer is circular; start at the read pointer, and
156			* go to the write pointer - 1.
157			*/
158		2	for (newl = skip = i = 0, p = bufdata + cur.msg_bufx;
159	✓✓	130978	i < cur.msg_bufs; i++, p++) {
160	✓✓	130976	if (p == bufdata + cur.msg_bufs)
161		2	p = bufdata;
162		130976	ch = *p;
163			/* Skip "\n<.>" syslog sequences. /
164	✗✓	130976	if (skip) {
165			if (ch == '>')
166			newl = skip = 0;
167			continue;
168			}
169	✗✓	130976	if (newl && ch == '<') {
170			skip = 1;
171			continue;
172			}
173	✓✓	130976	if (ch == '\0')
174		96076	continue;
175		34900	newl = ch == '\n';
176		34900	vis(buf, ch, 0, 0);
177	✓✗	34900	if (buf[1] == 0)
178	✓✗	34900	putchar(buf[0]);
179			else
180			printf("%s", buf);
181			}
182	✗✓	2	if (!newl)
183			putchar('\n');
184		2	return (0);
185			}
186
187			void
188			usage(void)
189			{
190			extern char *__progname;
191
192			fprintf(stderr, "usage: %s [-s] [-M core] [-N system]\n", __progname);
193			exit(1);
194			}