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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	sbin/dmesg/dmesg.c	Lines:	42	85	49.4 %
Date:	2017-11-13	Branches:	22	58	37.9 %


/*	$OpenBSD: dmesg.c,v 1.29 2017/09/01 07:31:45 tom 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;
	char *allocated = 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: %s", startupmsgs ? "KERN_CONSBUFSIZE" :
			    "KERN_MSGBUFSIZE");

		msgbufsize += sizeof(struct msgbuf) - 1;
		allocated = 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: %s",
			    startupmsgs ? "KERN_CONSBUF" : "KERN_MSGBUF");

		if (pledge("stdio flock 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 flock 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");
		allocated = 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');
	free(allocated);
	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 1.29 2017/09/01 07:31:45 tom 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			{
65			int ch, newl, skip, i;
66			char *p;
67		4	struct msgbuf cur;
68			char memf, nlistf, *bufdata = NULL;
69			char *allocated = NULL;
70			int startupmsgs = 0;
71		2	char buf[5];
72
73			memf = nlistf = NULL;
74	✗✓	4	while ((ch = getopt(argc, argv, "sM:N:")) != -1)
75			switch(ch) {
76			case 's':
77			startupmsgs = 1;
78			break;
79			case 'M':
80			memf = optarg;
81			break;
82			case 'N':
83			nlistf = optarg;
84			break;
85			case '?':
86			default:
87			usage();
88			}
89		2	argc -= optind;
90		2	argv += optind;
91
92	✓✗	2	if (memf == NULL && nlistf == NULL) {
93		2	int mib[2], msgbufsize;
94		2	size_t len;
95
96		2	mib[0] = CTL_KERN;
97		2	mib[1] = startupmsgs ? KERN_CONSBUFSIZE : KERN_MSGBUFSIZE;
98		2	len = sizeof(msgbufsize);
99	✗✓	2	if (sysctl(mib, 2, &msgbufsize, &len, NULL, 0))
100			err(1, "sysctl: %s", startupmsgs ? "KERN_CONSBUFSIZE" :
101			"KERN_MSGBUFSIZE");
102
103		2	msgbufsize += sizeof(struct msgbuf) - 1;
104		2	allocated = bufdata = calloc(1, msgbufsize);
105	✗✓	2	if (bufdata == NULL)
106			errx(1, "couldn't allocate space for buffer data");
107
108		2	mib[1] = startupmsgs ? KERN_CONSBUF : KERN_MSGBUF;
109		2	len = msgbufsize;
110	✗✓	2	if (sysctl(mib, 2, bufdata, &len, NULL, 0))
111			err(1, "sysctl: %s",
112			startupmsgs ? "KERN_CONSBUF" : "KERN_MSGBUF");
113
114	✗✓	2	if (pledge("stdio flock rpath cpath wpath", NULL) == -1)
115			err(1, "pledge");
116
117		2	memcpy(&cur, bufdata, sizeof(cur));
118		2	bufdata = ((struct msgbuf *)bufdata)->msg_bufc;
119		2	} else {
120			#ifndef NOKVM
121			struct msgbuf *bufp;
122			kvm_t *kd;
123
124			/* Read in kernel message buffer, do sanity checks. */
125			if ((kd = kvm_open(nlistf, memf, NULL, O_RDONLY,
126			"dmesg")) == NULL)
127			return (1);
128
129			if (pledge("stdio flock rpath cpath wpath", NULL) == -1)
130			err(1, "pledge");
131
132			if (kvm_nlist(kd, nl) == -1)
133			errx(1, "kvm_nlist: %s", kvm_geterr(kd));
134			if (nl[X_MSGBUF].n_type == 0)
135			errx(1, "%s: msgbufp not found",
136			nlistf ? nlistf : "namelist");
137			if (KREAD(nl[X_MSGBUF].n_value, bufp))
138			errx(1, "kvm_read: %s: (0x%lx)", kvm_geterr(kd),
139			nl[X_MSGBUF].n_value);
140			if (KREAD((long)bufp, cur))
141			errx(1, "kvm_read: %s (%0lx)", kvm_geterr(kd),
142			(unsigned long)bufp);
143			if (cur.msg_magic != MSG_MAGIC)
144			errx(1, "magic number incorrect");
145			allocated = bufdata = malloc(cur.msg_bufs);
146			if (bufdata == NULL)
147			errx(1, "couldn't allocate space for buffer data");
148			if (kvm_read(kd, (long)&bufp->msg_bufc, bufdata,
149			cur.msg_bufs) != cur.msg_bufs)
150			errx(1, "kvm_read: %s", kvm_geterr(kd));
151			kvm_close(kd);
152			#endif
153			}
154
155	✗✓	2	if (cur.msg_bufx >= cur.msg_bufs)
156			cur.msg_bufx = 0;
157			/*
158			* The message buffer is circular; start at the read pointer, and
159			* go to the write pointer - 1.
160			*/
161	✓✓	261956	for (newl = skip = i = 0, p = bufdata + cur.msg_bufx;
162		261954	i < cur.msg_bufs; i++, p++) {
163	✓✓	130976	if (p == bufdata + cur.msg_bufs)
164		2	p = bufdata;
165		130976	ch = *p;
166			/* Skip "\n<.>" syslog sequences. /
167	✓✓	130976	if (skip) {
168	✓✓	252	if (ch == '>')
169		126	newl = skip = 0;
170			continue;
171			}
172	✓✓	130724	if (newl && ch == '<') {
173			skip = 1;
174		126	continue;
175			}
176	✓✓	130598	if (ch == '\0')
177			continue;
178		12102	newl = ch == '\n';
179		12102	vis(buf, ch, 0, 0);
180	✓✗	12102	if (buf[1] == 0)
181	✓✗	24204	putchar(buf[0]);
182			else
183			printf("%s", buf);
184			}
185	✗✓	2	if (!newl)
186			putchar('\n');
187		2	free(allocated);
188		2	return (0);
189		2	}
190
191			void
192			usage(void)
193			{
194			extern char *__progname;
195
196			fprintf(stderr, "usage: %s [-s] [-M core] [-N system]\n", __progname);
197			exit(1);
198			}