ktrace.c revision 219043 
1/*-
2 * Copyright (c) 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1988, 1993\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#if 0
37#ifndef lint
38static char sccsid[] = "@(#)ktrace.c	8.1 (Berkeley) 6/6/93";
39#endif /* not lint */
40#endif
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: head/usr.bin/ktrace/ktrace.c 219043 2011-02-25 22:07:23Z dchagin $");
44
45#include <sys/param.h>
46#include <sys/stat.h>
47#include <sys/file.h>
48#include <sys/time.h>
49#include <sys/errno.h>
50#include <sys/uio.h>
51#include <sys/ktrace.h>
52
53#include <err.h>
54#include <stdlib.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <unistd.h>
58
59#include "ktrace.h"
60
61static char def_tracefile[] = DEF_TRACEFILE;
62
63static void no_ktrace(int);
64static int rpid(char *);
65static void usage(void);
66
67int
68main(int argc, char *argv[])
69{
70	enum { NOTSET, CLEAR, CLEARALL } clear;
71	int append, ch, fd, inherit, ops, pid, pidset, trpoints;
72	const char *tracefile;
73	mode_t omask;
74	struct stat sb;
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 && clear == NOTSET && !*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 |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE;
136
137		if (ktrace(tracefile, ops, trpoints, pid) < 0)
138			err(1, "%s", 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 | O_NONBLOCK,
145		    DEFFILEMODE)) < 0)
146			err(1, "%s", tracefile);
147		if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
148			errx(1, "refuse to append to %s not owned by you",
149			    tracefile);
150		if (!(S_ISREG(sb.st_mode)))
151			errx(1, "%s not regular file", tracefile);
152	} else {
153		if (unlink(tracefile) == -1 && errno != ENOENT)
154			err(1, "unlink %s", tracefile);
155		if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
156		    DEFFILEMODE)) < 0)
157			err(1, "%s", tracefile);
158	}
159	(void)umask(omask);
160	(void)close(fd);
161
162	trpoints |= PROC_ABI_POINTS;
163
164	if (*argv) {
165		if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
166			err(1, "%s", tracefile);
167		execvp(argv[0], &argv[0]);
168		err(1, "exec of '%s' failed", argv[0]);
169	}
170	else if (ktrace(tracefile, ops, trpoints, pid) < 0)
171		err(1, "%s", tracefile);
172	exit(0);
173}
174
175static int
176rpid(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
191static void
192usage(void)
193{
194	(void)fprintf(stderr, "%s\n%s\n",
195"usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t trstr]",
196"       ktrace [-adi] [-f trfile] [-t trstr] command");
197	exit(1);
198}
199
200static void
201no_ktrace(int sig __unused)
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