Annotation of src/usr.bin/ktrace/ktrace.c, Revision 1.21
1.21 ! tedu 1: /* $OpenBSD: ktrace.c,v 1.20 2007/03/03 23:46:55 jmc Exp $ */
1.1 deraadt 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.
1.16 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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
1.21 ! tedu 43: static char *rcsid = "$OpenBSD: ktrace.c,v 1.20 2007/03/03 23:46:55 jmc Exp $";
1.1 deraadt 44: #endif /* not lint */
45:
46: #include <sys/param.h>
47: #include <sys/stat.h>
48: #include <sys/time.h>
49: #include <sys/uio.h>
50: #include <sys/ktrace.h>
51:
52: #include <err.h>
1.19 millert 53: #include <errno.h>
1.8 millert 54: #include <fcntl.h>
1.10 deraadt 55: #include <stdlib.h>
1.1 deraadt 56: #include <stdio.h>
1.14 deraadt 57: #include <string.h>
1.1 deraadt 58: #include <unistd.h>
59:
60: #include "ktrace.h"
1.11 espie 61: #include "extern.h"
1.1 deraadt 62:
1.13 millert 63: static int rpid(const char *);
64: static void no_ktrace(int);
65: static void usage(void);
1.1 deraadt 66:
1.10 deraadt 67: int
1.17 deraadt 68: main(int argc, char *argv[])
1.1 deraadt 69: {
70: enum { NOTSET, CLEAR, CLEARALL } clear;
1.10 deraadt 71: int append, ch, fd, inherit, ops, pidset, trpoints;
72: pid_t pid;
1.1 deraadt 73: char *tracefile;
1.3 deraadt 74: mode_t omask;
1.6 angelos 75: struct stat sb;
1.1 deraadt 76:
77: clear = NOTSET;
1.21 ! tedu 78: append = ops = pidset = inherit = pid = 0;
1.1 deraadt 79: trpoints = DEF_POINTS;
80: tracefile = DEF_TRACEFILE;
1.4 millert 81: while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1)
1.1 deraadt 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:
1.15 deraadt 123: if ((pidset && *argv) || (!pidset && !*argv && clear != CLEAR))
1.1 deraadt 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)
1.9 millert 139: err(1, "%s", tracefile);
1.1 deraadt 140: exit(0);
141: }
142:
1.3 deraadt 143: omask = umask(S_IRWXG|S_IRWXO);
1.5 deraadt 144: if (append) {
145: if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0)
1.9 millert 146: err(1, "%s", tracefile);
1.5 deraadt 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)
1.9 millert 155: err(1, "%s", tracefile);
1.5 deraadt 156: }
1.3 deraadt 157: (void)umask(omask);
1.1 deraadt 158: (void)close(fd);
159:
160: if (*argv) {
161: if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
1.9 millert 162: err(1, "%s", tracefile);
1.1 deraadt 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)
1.9 millert 167: err(1, "%s", tracefile);
1.1 deraadt 168: exit(0);
169: }
170:
1.11 espie 171: static int
1.17 deraadt 172: rpid(const char *p)
1.1 deraadt 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:
1.11 espie 187: static void
1.17 deraadt 188: usage(void)
1.1 deraadt 189: {
190: (void)fprintf(stderr,
1.20 jmc 191: "usage: ktrace [-aCcdi] [-f trfile] [-g pgid] [-p pid] [-t trstr]\n"
192: " ktrace [-adi] [-f trfile] [-t trstr] command\n");
1.1 deraadt 193: exit(1);
194: }
195:
1.18 deraadt 196: /* ARGSUSED */
1.11 espie 197: static void
1.17 deraadt 198: no_ktrace(int signo)
1.1 deraadt 199: {
1.12 deraadt 200: char buf[8192];
201:
202: snprintf(buf, sizeof(buf),
1.15 deraadt 203: "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'option KTRACE'\n");
1.12 deraadt 204: write(STDERR_FILENO, buf, strlen(buf));
205: _exit(1);
1.1 deraadt 206: }
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