Annotation of src/usr.bin/ktrace/ktrace.c, Revision 1.14
1.14 ! deraadt 1: /* $OpenBSD: ktrace.c,v 1.13 2002/02/16 21:27:47 millert 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.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: static char copyright[] =
39: "@(#) Copyright (c) 1988, 1993\n\
40: The Regents of the University of California. All rights reserved.\n";
41: #endif /* not lint */
42:
43: #ifndef lint
44: #if 0
45: static char sccsid[] = "@(#)ktrace.c 8.2 (Berkeley) 4/28/95";
46: #endif
1.14 ! deraadt 47: static char *rcsid = "$OpenBSD: ktrace.c,v 1.13 2002/02/16 21:27:47 millert Exp $";
1.1 deraadt 48: #endif /* not lint */
49:
50: #include <sys/param.h>
51: #include <sys/stat.h>
52: #include <sys/time.h>
53: #include <sys/errno.h>
54: #include <sys/uio.h>
55: #include <sys/ktrace.h>
56:
57: #include <err.h>
1.8 millert 58: #include <fcntl.h>
1.10 deraadt 59: #include <stdlib.h>
1.1 deraadt 60: #include <stdio.h>
1.14 ! deraadt 61: #include <string.h>
1.1 deraadt 62: #include <unistd.h>
63:
64: #include "ktrace.h"
1.11 espie 65: #include "extern.h"
1.1 deraadt 66:
1.13 millert 67: static int rpid(const char *);
68: static void no_ktrace(int);
69: static void usage(void);
1.1 deraadt 70:
1.10 deraadt 71: int
1.1 deraadt 72: main(argc, argv)
73: int argc;
74: char **argv;
75: {
76: enum { NOTSET, CLEAR, CLEARALL } clear;
1.10 deraadt 77: int append, ch, fd, inherit, ops, pidset, trpoints;
78: pid_t pid;
1.1 deraadt 79: char *tracefile;
1.3 deraadt 80: mode_t omask;
1.6 angelos 81: struct stat sb;
1.1 deraadt 82:
83: clear = NOTSET;
84: append = ops = pidset = inherit = 0;
85: trpoints = DEF_POINTS;
86: tracefile = DEF_TRACEFILE;
1.4 millert 87: while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1)
1.1 deraadt 88: switch((char)ch) {
89: case 'a':
90: append = 1;
91: break;
92: case 'C':
93: clear = CLEARALL;
94: pidset = 1;
95: break;
96: case 'c':
97: clear = CLEAR;
98: break;
99: case 'd':
100: ops |= KTRFLAG_DESCEND;
101: break;
102: case 'f':
103: tracefile = optarg;
104: break;
105: case 'g':
106: pid = -rpid(optarg);
107: pidset = 1;
108: break;
109: case 'i':
110: inherit = 1;
111: break;
112: case 'p':
113: pid = rpid(optarg);
114: pidset = 1;
115: break;
116: case 't':
117: trpoints = getpoints(optarg);
118: if (trpoints < 0) {
119: warnx("unknown facility in %s", optarg);
120: usage();
121: }
122: break;
123: default:
124: usage();
125: }
126: argv += optind;
127: argc -= optind;
128:
1.11 espie 129: if ((pidset && *argv) || (!pidset && !*argv))
1.1 deraadt 130: usage();
131:
132: if (inherit)
133: trpoints |= KTRFAC_INHERIT;
134:
135: (void)signal(SIGSYS, no_ktrace);
136: if (clear != NOTSET) {
137: if (clear == CLEARALL) {
138: ops = KTROP_CLEAR | KTRFLAG_DESCEND;
139: trpoints = ALL_POINTS;
140: pid = 1;
141: } else
142: ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE;
143:
144: if (ktrace(tracefile, ops, trpoints, pid) < 0)
1.9 millert 145: err(1, "%s", tracefile);
1.1 deraadt 146: exit(0);
147: }
148:
1.3 deraadt 149: omask = umask(S_IRWXG|S_IRWXO);
1.5 deraadt 150: if (append) {
151: if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0)
1.9 millert 152: err(1, "%s", tracefile);
1.5 deraadt 153: if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
154: errx(1, "Refuse to append to %s: not owned by you.",
155: tracefile);
156: } else {
157: if (unlink(tracefile) == -1 && errno != ENOENT)
158: err(1, "unlink %s", tracefile);
159: if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
160: DEFFILEMODE)) < 0)
1.9 millert 161: err(1, "%s", tracefile);
1.5 deraadt 162: }
1.3 deraadt 163: (void)umask(omask);
1.1 deraadt 164: (void)close(fd);
165:
166: if (*argv) {
167: if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
1.9 millert 168: err(1, "%s", tracefile);
1.1 deraadt 169: execvp(argv[0], &argv[0]);
170: err(1, "exec of '%s' failed", argv[0]);
171: }
172: else if (ktrace(tracefile, ops, trpoints, pid) < 0)
1.9 millert 173: err(1, "%s", tracefile);
1.1 deraadt 174: exit(0);
175: }
176:
1.11 espie 177: static int
1.1 deraadt 178: rpid(p)
1.11 espie 179: const char *p;
1.1 deraadt 180: {
181: static int first;
182:
183: if (first++) {
184: warnx("only one -g or -p flag is permitted.");
185: usage();
186: }
187: if (!*p) {
188: warnx("illegal process id.");
189: usage();
190: }
191: return(atoi(p));
192: }
193:
1.11 espie 194: static void
1.1 deraadt 195: usage()
196: {
197: (void)fprintf(stderr,
1.7 deraadt 198: "usage:\tktrace [-aCcid] [-f trfile] [-g pgid] [-p pid] [-t [cenis]\n\tktrace [-aCcid] [-f trfile] [-t [cenis] command\n");
1.1 deraadt 199: exit(1);
200: }
201:
1.11 espie 202: static void
1.1 deraadt 203: no_ktrace(sig)
1.5 deraadt 204: int sig;
1.1 deraadt 205: {
1.12 deraadt 206: char buf[8192];
207:
208: snprintf(buf, sizeof(buf),
1.1 deraadt 209: "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n");
1.12 deraadt 210: write(STDERR_FILENO, buf, strlen(buf));
211: _exit(1);
1.1 deraadt 212: }
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