1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/param.h>
33 #include <sys/file.h>
34 #include <sys/stat.h>
35 #include <sys/time.h>
36 #include <sys/uio.h>
37 #include <sys/ktrace.h>
38
39 #include <err.h>
40 #include <errno.h>
41 #include <inttypes.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45
46 #include "ktrace.h"
47
48 static char def_tracefile[] = DEF_TRACEFILE;
49
50 static enum clear { NOTSET, CLEAR, CLEARALL } clear = NOTSET;
51 static int pid;
52
53 static void no_ktrace(int);
54 static void set_pid_clear(const char *, enum clear);
55 static void usage(void) __dead2;
56
57 int
main(int argc,char * argv[])58 main(int argc, char *argv[])
59 {
60 int append, ch, fd, inherit, ops, trpoints;
61 const char *tracefile;
62 mode_t omask;
63 struct stat sb;
64
65 append = ops = inherit = 0;
66 trpoints = DEF_POINTS;
67 tracefile = def_tracefile;
68 while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1)
69 switch((char)ch) {
70 case 'a':
71 append = 1;
72 break;
73 case 'C':
74 set_pid_clear("1", CLEARALL);
75 break;
76 case 'c':
77 set_pid_clear(NULL, CLEAR);
78 break;
79 case 'd':
80 ops |= KTRFLAG_DESCEND;
81 break;
82 case 'f':
83 tracefile = optarg;
84 break;
85 case 'g':
86 set_pid_clear(optarg, NOTSET);
87 pid = -pid;
88 break;
89 case 'i':
90 inherit = 1;
91 break;
92 case 'p':
93 set_pid_clear(optarg, NOTSET);
94 break;
95 case 't':
96 trpoints = getpoints(optarg);
97 if (trpoints < 0) {
98 warnx("unknown facility in %s", optarg);
99 usage();
100 }
101 break;
102 default:
103 usage();
104 }
105
106 argv += optind;
107 argc -= optind;
108
109 /* must have either -[Cc], a pid or a command */
110 if (clear == NOTSET && pid == 0 && argc == 0)
111 usage();
112 /* can't have both a pid and a command */
113 /* (note that -C sets pid to 1) */
114 if (pid != 0 && argc > 0) {
115 usage();
116 }
117
118 if (inherit)
119 trpoints |= KTRFAC_INHERIT;
120
121 (void)signal(SIGSYS, no_ktrace);
122 if (clear != NOTSET) {
123 if (clear == CLEARALL) {
124 ops = KTROP_CLEAR | KTRFLAG_DESCEND;
125 trpoints = ALL_POINTS;
126 } else {
127 ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE;
128 }
129 if (ktrace(tracefile, ops, trpoints, pid) < 0)
130 err(1, "%s", tracefile);
131 exit(0);
132 }
133
134 omask = umask(S_IRWXG|S_IRWXO);
135 if (append) {
136 if ((fd = open(tracefile, O_CREAT | O_WRONLY | O_NONBLOCK,
137 DEFFILEMODE)) < 0)
138 err(1, "%s", tracefile);
139 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
140 errx(1, "refuse to append to %s not owned by you",
141 tracefile);
142 if (!(S_ISREG(sb.st_mode)))
143 errx(1, "%s not regular file", tracefile);
144 } else {
145 if (unlink(tracefile) == -1 && errno != ENOENT)
146 err(1, "unlink %s", tracefile);
147 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
148 DEFFILEMODE)) < 0)
149 err(1, "%s", tracefile);
150 }
151 (void)umask(omask);
152 (void)close(fd);
153
154 trpoints |= PROC_ABI_POINTS;
155
156 if (argc > 0) {
157 if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
158 err(1, "%s", tracefile);
159 execvp(*argv, argv);
160 err(1, "exec of '%s' failed", *argv);
161 }
162 if (ktrace(tracefile, ops, trpoints, pid) < 0)
163 err(1, "%s", tracefile);
164 exit(0);
165 }
166
167 static void
set_pid_clear(const char * p,enum clear cl)168 set_pid_clear(const char *p, enum clear cl)
169 {
170 intmax_t n;
171 char *e;
172
173 if (clear != NOTSET && cl != NOTSET) {
174 /* either -c and -C or either of them twice */
175 warnx("only one -c or -C flag is permitted");
176 usage();
177 }
178 if ((clear == CLEARALL && p != NULL) || (cl == CLEARALL && pid != 0)) {
179 /* both -C and a pid or pgid */
180 warnx("the -C flag may not be combined with -g or -p");
181 usage();
182 }
183 if (p != NULL && pid != 0) {
184 /* either -p and -g or either of them twice */
185 warnx("only one -g or -p flag is permitted");
186 usage();
187 }
188 if (p != NULL) {
189 errno = 0;
190 n = strtoimax(p, &e, 10);
191 /*
192 * 1) not a number, or outside the range of an intmax_t
193 * 2) inside the range of intmax_t but outside the range
194 * of an int, keeping in mind that the pid may be
195 * negated if it's actually a pgid.
196 */
197 if (*e != '\0' || n < 1 || errno == ERANGE ||
198 n > (intmax_t)INT_MAX || n > -(intmax_t)INT_MIN) {
199 warnx("invalid process or group id");
200 usage();
201 }
202 pid = n;
203 }
204 if (cl != NOTSET)
205 if ((clear = cl) == CLEARALL)
206 pid = 1;
207 }
208
209 static void
usage(void)210 usage(void)
211 {
212
213 fprintf(stderr, "%s\n%s\n",
214 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t trstr]",
215 " ktrace [-adi] [-f trfile] [-t trstr] command");
216 exit(1);
217 }
218
219 static void
no_ktrace(int sig __unused)220 no_ktrace(int sig __unused)
221 {
222
223 fprintf(stderr, "error:\t%s\n\t%s\n",
224 "ktrace() system call not supported in the running kernel",
225 "re-compile kernel with 'options KTRACE'");
226 exit(1);
227 }
228