1 /* $OpenBSD: ktrace.c,v 1.18 2004/09/14 22:25:06 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. 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 #ifndef lint
34 static char copyright[] =
35 "@(#) Copyright (c) 1988, 1993\n\
36 The Regents of the University of California. All rights reserved.\n";
37 #endif /* not lint */
38
39 #ifndef lint
40 #if 0
41 static char sccsid[] = "@(#)ktrace.c 8.2 (Berkeley) 4/28/95";
42 #endif
43 static char *rcsid = "$OpenBSD: ktrace.c,v 1.18 2004/09/14 22:25:06 deraadt Exp $";
44 #endif /* not lint */
45
46 #include <sys/param.h>
47 #include <sys/stat.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 <fcntl.h>
55 #include <stdlib.h>
56 #include <stdio.h>
57 #include <string.h>
58 #include <unistd.h>
59
60 #include "ktrace.h"
61 #include "extern.h"
62
63 static int rpid(const char *);
64 static void no_ktrace(int);
65 static void usage(void);
66
67 int
main(int argc,char * argv[])68 main(int argc, char *argv[])
69 {
70 enum { NOTSET, CLEAR, CLEARALL } clear;
71 int append, ch, fd, inherit, ops, pidset, trpoints;
72 pid_t pid;
73 char *tracefile;
74 mode_t omask;
75 struct stat sb;
76
77 clear = NOTSET;
78 append = ops = pidset = inherit = 0;
79 trpoints = DEF_POINTS;
80 tracefile = DEF_TRACEFILE;
81 while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1)
82 switch((char)ch) {
83 case 'a':
84 append = 1;
85 break;
86 case 'C':
87 clear = CLEARALL;
88 pidset = 1;
89 break;
90 case 'c':
91 clear = CLEAR;
92 break;
93 case 'd':
94 ops |= KTRFLAG_DESCEND;
95 break;
96 case 'f':
97 tracefile = optarg;
98 break;
99 case 'g':
100 pid = -rpid(optarg);
101 pidset = 1;
102 break;
103 case 'i':
104 inherit = 1;
105 break;
106 case 'p':
107 pid = rpid(optarg);
108 pidset = 1;
109 break;
110 case 't':
111 trpoints = getpoints(optarg);
112 if (trpoints < 0) {
113 warnx("unknown facility in %s", optarg);
114 usage();
115 }
116 break;
117 default:
118 usage();
119 }
120 argv += optind;
121 argc -= optind;
122
123 if ((pidset && *argv) || (!pidset && !*argv && clear != CLEAR))
124 usage();
125
126 if (inherit)
127 trpoints |= KTRFAC_INHERIT;
128
129 (void)signal(SIGSYS, no_ktrace);
130 if (clear != NOTSET) {
131 if (clear == CLEARALL) {
132 ops = KTROP_CLEAR | KTRFLAG_DESCEND;
133 trpoints = ALL_POINTS;
134 pid = 1;
135 } else
136 ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE;
137
138 if (ktrace(tracefile, ops, trpoints, pid) < 0)
139 err(1, "%s", tracefile);
140 exit(0);
141 }
142
143 omask = umask(S_IRWXG|S_IRWXO);
144 if (append) {
145 if ((fd = open(tracefile, O_CREAT | O_WRONLY, 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 } else {
151 if (unlink(tracefile) == -1 && errno != ENOENT)
152 err(1, "unlink %s", tracefile);
153 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
154 DEFFILEMODE)) < 0)
155 err(1, "%s", tracefile);
156 }
157 (void)umask(omask);
158 (void)close(fd);
159
160 if (*argv) {
161 if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
162 err(1, "%s", tracefile);
163 execvp(argv[0], &argv[0]);
164 err(1, "exec of '%s' failed", argv[0]);
165 }
166 else if (ktrace(tracefile, ops, trpoints, pid) < 0)
167 err(1, "%s", tracefile);
168 exit(0);
169 }
170
171 static int
rpid(const char * p)172 rpid(const char *p)
173 {
174 static int first;
175
176 if (first++) {
177 warnx("only one -g or -p flag is permitted.");
178 usage();
179 }
180 if (!*p) {
181 warnx("illegal process id.");
182 usage();
183 }
184 return(atoi(p));
185 }
186
187 static void
usage(void)188 usage(void)
189 {
190 (void)fprintf(stderr,
191 "usage:\tktrace [-aCcdi] [-f trfile] [-g pgid] [-p pid] [-t [ceinsw]]\n\tktrace [-adi] [-f trfile] [-t [ceinsw]] command\n");
192 exit(1);
193 }
194
195 /* ARGSUSED */
196 static void
no_ktrace(int signo)197 no_ktrace(int signo)
198 {
199 char buf[8192];
200
201 snprintf(buf, sizeof(buf),
202 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'option KTRACE'\n");
203 write(STDERR_FILENO, buf, strlen(buf));
204 _exit(1);
205 }
206