ktrace.c revision 1.10 
1/*	$OpenBSD: ktrace.c,v 1.10 2001/07/12 05:17:13 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 1.10 2001/07/12 05:17:13 deraadt Exp $";
48#endif /* not lint */
49
50#include <sys/param.h>
51#include <sys/stat.h>
52#include <sys/time.h>
53#include <sys/errno.h>
54#include <sys/uio.h>
55#include <sys/ktrace.h>
56
57#include <err.h>
58#include <fcntl.h>
59#include <stdlib.h>
60#include <stdio.h>
61#include <unistd.h>
62
63#include "ktrace.h"
64
65void no_ktrace __P((int));
66void usage __P((void));
67
68int
69main(argc, argv)
70	int argc;
71	char **argv;
72{
73	enum { NOTSET, CLEAR, CLEARALL } clear;
74	int append, ch, fd, inherit, ops, pidset, trpoints;
75	pid_t pid;
76	char *tracefile;
77	mode_t omask;
78	struct stat sb;
79
80	clear = NOTSET;
81	append = ops = pidset = inherit = 0;
82	trpoints = DEF_POINTS;
83	tracefile = DEF_TRACEFILE;
84	while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1)
85		switch((char)ch) {
86		case 'a':
87			append = 1;
88			break;
89		case 'C':
90			clear = CLEARALL;
91			pidset = 1;
92			break;
93		case 'c':
94			clear = CLEAR;
95			break;
96		case 'd':
97			ops |= KTRFLAG_DESCEND;
98			break;
99		case 'f':
100			tracefile = optarg;
101			break;
102		case 'g':
103			pid = -rpid(optarg);
104			pidset = 1;
105			break;
106		case 'i':
107			inherit = 1;
108			break;
109		case 'p':
110			pid = rpid(optarg);
111			pidset = 1;
112			break;
113		case 't':
114			trpoints = getpoints(optarg);
115			if (trpoints < 0) {
116				warnx("unknown facility in %s", optarg);
117				usage();
118			}
119			break;
120		default:
121			usage();
122		}
123	argv += optind;
124	argc -= optind;
125
126	if (pidset && *argv || !pidset && !*argv)
127		usage();
128
129	if (inherit)
130		trpoints |= KTRFAC_INHERIT;
131
132	(void)signal(SIGSYS, no_ktrace);
133	if (clear != NOTSET) {
134		if (clear == CLEARALL) {
135			ops = KTROP_CLEAR | KTRFLAG_DESCEND;
136			trpoints = ALL_POINTS;
137			pid = 1;
138		} else
139			ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE;
140
141		if (ktrace(tracefile, ops, trpoints, pid) < 0)
142			err(1, "%s", tracefile);
143		exit(0);
144	}
145
146	omask = umask(S_IRWXG|S_IRWXO);
147	if (append) {
148		if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0)
149			err(1, "%s", tracefile);
150		if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
151			errx(1, "Refuse to append to %s: not owned by you.",
152			    tracefile);
153	} else {
154		if (unlink(tracefile) == -1 && errno != ENOENT)
155			err(1, "unlink %s", tracefile);
156		if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
157		    DEFFILEMODE)) < 0)
158			err(1, "%s", tracefile);
159	}
160	(void)umask(omask);
161	(void)close(fd);
162
163	if (*argv) {
164		if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
165			err(1, "%s", tracefile);
166		execvp(argv[0], &argv[0]);
167		err(1, "exec of '%s' failed", argv[0]);
168	}
169	else if (ktrace(tracefile, ops, trpoints, pid) < 0)
170		err(1, "%s", tracefile);
171	exit(0);
172}
173
174int
175rpid(p)
176	char *p;
177{
178	static int first;
179
180	if (first++) {
181		warnx("only one -g or -p flag is permitted.");
182		usage();
183	}
184	if (!*p) {
185		warnx("illegal process id.");
186		usage();
187	}
188	return(atoi(p));
189}
190
191void
192usage()
193{
194	(void)fprintf(stderr,
195"usage:\tktrace [-aCcid] [-f trfile] [-g pgid] [-p pid] [-t [cenis]\n\tktrace [-aCcid] [-f trfile] [-t [cenis] command\n");
196	exit(1);
197}
198
199void
200no_ktrace(sig)
201	int sig;
202{
203	(void)fprintf(stderr,
204"error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n");
205	exit(1);
206}
207