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 * 3. 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 * @(#) Copyright (c) 1988, 1993 The Regents of the University of California. All rights reserved.
30 * @(#)ktrace.c 8.1 (Berkeley) 6/6/93
31 * $FreeBSD: src/usr.bin/ktrace/ktrace.c,v 1.12.2.3 2001/07/11 00:29:27 mikeh Exp $
32 */
33
34 #include <sys/param.h>
35 #include <sys/stat.h>
36 #include <sys/time.h>
37 #include <sys/errno.h>
38 #include <sys/ktrace.h>
39
40 #include <err.h>
41 #include <fcntl.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45
46 #include "ktrace.h"
47
48 static void no_ktrace(int);
49 static int rpid(char *p);
50 static void usage(void);
51
52 int
main(int argc,char ** argv)53 main(int argc, char **argv)
54 {
55 enum { NOTSET, CLEAR, CLEARALL } clear;
56 int append, ch, fd, inherit, ops, pid, pidset, trpoints;
57 const char *tracefile;
58 mode_t omask;
59 struct stat sb;
60
61 clear = NOTSET;
62 append = ops = pid = pidset = inherit = 0;
63 trpoints = DEF_POINTS;
64 tracefile = DEF_TRACEFILE;
65 while ((ch = getopt(argc, argv, "aCcdf:g:ip:t:")) != -1)
66 switch(ch) {
67 case 'a':
68 append = 1;
69 break;
70 case 'C':
71 clear = CLEARALL;
72 pidset = 1;
73 break;
74 case 'c':
75 clear = CLEAR;
76 break;
77 case 'd':
78 ops |= KTRFLAG_DESCEND;
79 break;
80 case 'f':
81 tracefile = optarg;
82 break;
83 case 'g':
84 pid = -rpid(optarg);
85 pidset = 1;
86 break;
87 case 'i':
88 inherit = 1;
89 break;
90 case 'p':
91 pid = rpid(optarg);
92 pidset = 1;
93 break;
94 case 't':
95 trpoints = getpoints(optarg);
96 if (trpoints < 0) {
97 warnx("unknown facility in %s", optarg);
98 usage();
99 }
100 break;
101 default:
102 usage();
103 }
104 argv += optind;
105 argc -= optind;
106
107 if ((pidset && *argv) || (!pidset && clear == NOTSET && !*argv))
108 usage();
109
110 if (inherit)
111 trpoints |= KTRFAC_INHERIT;
112
113 signal(SIGSYS, no_ktrace);
114 if (clear != NOTSET) {
115 if (clear == CLEARALL) {
116 ops = KTROP_CLEAR | KTRFLAG_DESCEND;
117 trpoints = ALL_POINTS;
118 pid = 1;
119 } else
120 ops |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE;
121
122 if (ktrace(tracefile, ops, trpoints, pid) < 0)
123 err(1, "%s", tracefile);
124 exit(0);
125 }
126
127 omask = umask(S_IRWXG|S_IRWXO);
128 if (append) {
129 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0)
130 err(1, "%s", tracefile);
131 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
132 errx(1, "Refuse to append to %s not owned by you.",
133 tracefile);
134 } else {
135 if (unlink(tracefile) == -1 && errno != ENOENT)
136 err(1, "unlink %s", tracefile);
137 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
138 DEFFILEMODE)) < 0)
139 err(1, "%s", tracefile);
140 }
141 umask(omask);
142 close(fd);
143
144 if (*argv) {
145 if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
146 err(1, "%s", tracefile);
147 execvp(argv[0], &argv[0]);
148 err(1, "exec of '%s' failed", argv[0]);
149 }
150 else if (ktrace(tracefile, ops, trpoints, pid) < 0)
151 err(1, "%s", tracefile);
152 exit(0);
153 }
154
155 static int
rpid(char * p)156 rpid(char *p)
157 {
158 static int first;
159
160 if (first++) {
161 warnx("only one -g or -p flag is permitted.");
162 usage();
163 }
164 if (!*p) {
165 warnx("illegal process id.");
166 usage();
167 }
168 return(atoi(p));
169 }
170
171 static void
usage(void)172 usage(void)
173 {
174 fprintf(stderr, "%s\n%s\n",
175 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t cnisuw]",
176 " ktrace [-adi] [-f trfile] [-t cnisuw] command");
177 exit(1);
178 }
179
180 static void
no_ktrace(int sig __unused)181 no_ktrace(int sig __unused)
182 {
183 fprintf(stderr,
184 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n");
185 exit(1);
186 }
187