ktrace.c revision 1.5 
1/*	$OpenBSD: ktrace.c,v 1.5 1997/06/18 09:44:09 deraadt Exp $	*/
2/*	$NetBSD: ktrace.c,v 1.4 1995/08/31 23:01:44 jtc Exp $	*/
3
4/*-
5 * Copyright (c) 1988, 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. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static char copyright[] =
39"@(#) Copyright (c) 1988, 1993\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)ktrace.c	8.2 (Berkeley) 4/28/95";
46#endif
47static char *rcsid = "$OpenBSD: ktrace.c,v 1.5 1997/06/18 09:44:09 deraadt Exp $";
48#endif /* not lint */
49
50#include <sys/param.h>
51#include <sys/stat.h>
52#include <sys/file.h>
53#include <sys/time.h>
54#include <sys/errno.h>
55#include <sys/uio.h>
56#include <sys/ktrace.h>
57
58#include <err.h>
59#include <stdio.h>
60#include <unistd.h>
61
62#include "ktrace.h"
63
64void no_ktrace __P((int));
65void usage __P((void));
66
67main(argc, argv)
68	int argc;
69	char **argv;
70{
71	enum { NOTSET, CLEAR, CLEARALL } clear;
72	int append, ch, fd, inherit, ops, pid, pidset, trpoints;
73	char *tracefile;
74	mode_t omask;
75
76	clear = NOTSET;
77	append = ops = pidset = inherit = 0;
78	trpoints = DEF_POINTS;
79	tracefile = DEF_TRACEFILE;
80	while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1)
81		switch((char)ch) {
82		case 'a':
83			append = 1;
84			break;
85		case 'C':
86			clear = CLEARALL;
87			pidset = 1;
88			break;
89		case 'c':
90			clear = CLEAR;
91			break;
92		case 'd':
93			ops |= KTRFLAG_DESCEND;
94			break;
95		case 'f':
96			tracefile = optarg;
97			break;
98		case 'g':
99			pid = -rpid(optarg);
100			pidset = 1;
101			break;
102		case 'i':
103			inherit = 1;
104			break;
105		case 'p':
106			pid = rpid(optarg);
107			pidset = 1;
108			break;
109		case 't':
110			trpoints = getpoints(optarg);
111			if (trpoints < 0) {
112				warnx("unknown facility in %s", optarg);
113				usage();
114			}
115			break;
116		default:
117			usage();
118		}
119	argv += optind;
120	argc -= optind;
121
122	if (pidset && *argv || !pidset && !*argv)
123		usage();
124
125	if (inherit)
126		trpoints |= KTRFAC_INHERIT;
127
128	(void)signal(SIGSYS, no_ktrace);
129	if (clear != NOTSET) {
130		if (clear == CLEARALL) {
131			ops = KTROP_CLEAR | KTRFLAG_DESCEND;
132			trpoints = ALL_POINTS;
133			pid = 1;
134		} else
135			ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE;
136
137		if (ktrace(tracefile, ops, trpoints, pid) < 0)
138			err(1, tracefile);
139		exit(0);
140	}
141
142	omask = umask(S_IRWXG|S_IRWXO);
143	if (append) {
144		if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0)
145			err(1, tracefile);
146		if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
147			errx(1, "Refuse to append to %s: not owned by you.",
148			    tracefile);
149	} else {
150		if (unlink(tracefile) == -1 && errno != ENOENT)
151			err(1, "unlink %s", tracefile);
152		if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
153		    DEFFILEMODE)) < 0)
154			err(1, tracefile);
155	}
156	(void)umask(omask);
157	(void)close(fd);
158
159	if (*argv) {
160		if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
161			err(1, tracefile);
162		execvp(argv[0], &argv[0]);
163		err(1, "exec of '%s' failed", argv[0]);
164	}
165	else if (ktrace(tracefile, ops, trpoints, pid) < 0)
166		err(1, tracefile);
167	exit(0);
168}
169
170rpid(p)
171	char *p;
172{
173	static int first;
174
175	if (first++) {
176		warnx("only one -g or -p flag is permitted.");
177		usage();
178	}
179	if (!*p) {
180		warnx("illegal process id.");
181		usage();
182	}
183	return(atoi(p));
184}
185
186void
187usage()
188{
189	(void)fprintf(stderr,
190"usage:\tktrace [-aCcid] [-f trfile] [-g pgid] [-p pid] [-t [acgn]\n\tktrace [-aCcid] [-f trfile] [-t [acgn] command\n");
191	exit(1);
192}
193
194void
195no_ktrace(sig)
196	int sig;
197{
198	(void)fprintf(stderr,
199"error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n");
200	exit(1);
201}
202