Annotation of src/usr.bin/ktrace/ktrace.c, Revision 1.33
1.33 ! guenther 1: /* $OpenBSD: ktrace.c,v 1.32 2015/04/18 18:28:37 deraadt 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:
1.31 deraadt 33: #include <sys/param.h> /* MAXCOMLEN */
34: #include <sys/signal.h>
1.1 deraadt 35: #include <sys/stat.h>
36: #include <sys/time.h>
37: #include <sys/uio.h>
38: #include <sys/ktrace.h>
39:
40: #include <err.h>
1.19 millert 41: #include <errno.h>
1.8 millert 42: #include <fcntl.h>
1.10 deraadt 43: #include <stdlib.h>
1.1 deraadt 44: #include <stdio.h>
1.14 deraadt 45: #include <string.h>
1.1 deraadt 46: #include <unistd.h>
47:
48: #include "ktrace.h"
1.11 espie 49: #include "extern.h"
1.1 deraadt 50:
1.25 miod 51: extern char *__progname;
52:
1.13 millert 53: static int rpid(const char *);
54: static void no_ktrace(int);
55: static void usage(void);
1.1 deraadt 56:
1.25 miod 57: int is_ltrace;
58:
1.10 deraadt 59: int
1.17 deraadt 60: main(int argc, char *argv[])
1.1 deraadt 61: {
62: enum { NOTSET, CLEAR, CLEARALL } clear;
1.10 deraadt 63: int append, ch, fd, inherit, ops, pidset, trpoints;
64: pid_t pid;
1.25 miod 65: char *tracefile, *tracespec;
1.3 deraadt 66: mode_t omask;
1.6 angelos 67: struct stat sb;
1.1 deraadt 68:
1.25 miod 69: is_ltrace = strcmp(__progname, "ltrace") == 0;
70:
1.1 deraadt 71: clear = NOTSET;
1.21 tedu 72: append = ops = pidset = inherit = pid = 0;
1.25 miod 73: trpoints = is_ltrace ? KTRFAC_USER : DEF_POINTS;
1.1 deraadt 74: tracefile = DEF_TRACEFILE;
1.25 miod 75: tracespec = NULL;
76:
77: if (is_ltrace) {
1.28 miod 78: while ((ch = getopt(argc, argv, "af:it:u:")) != -1)
1.25 miod 79: switch ((char)ch) {
80: case 'a':
81: append = 1;
82: break;
83: case 'f':
84: tracefile = optarg;
85: break;
86: case 'i':
87: inherit = 1;
1.28 miod 88: break;
89: case 't':
1.33 ! guenther 90: trpoints = getpoints(optarg, KTRFAC_USER);
1.28 miod 91: if (trpoints < 0) {
92: warnx("unknown facility in %s", optarg);
93: usage();
94: }
1.25 miod 95: break;
96: case 'u':
97: tracespec = optarg;
98: break;
99: default:
100: usage();
101: }
102: } else {
103: while ((ch = getopt(argc, argv, "aBCcdf:g:ip:t:")) != -1)
104: switch ((char)ch) {
105: case 'a':
106: append = 1;
107: break;
108: case 'B':
109: putenv("LD_BIND_NOW=");
110: break;
111: case 'C':
112: clear = CLEARALL;
113: pidset = 1;
114: break;
115: case 'c':
116: clear = CLEAR;
117: break;
118: case 'd':
119: ops |= KTRFLAG_DESCEND;
120: break;
121: case 'f':
122: tracefile = optarg;
123: break;
124: case 'g':
125: pid = -rpid(optarg);
126: pidset = 1;
127: break;
128: case 'i':
129: inherit = 1;
130: break;
131: case 'p':
132: pid = rpid(optarg);
133: pidset = 1;
134: break;
135: case 't':
1.33 ! guenther 136: trpoints = getpoints(optarg, DEF_POINTS);
1.25 miod 137: if (trpoints < 0) {
138: warnx("unknown facility in %s", optarg);
139: usage();
140: }
141: break;
142: default:
1.1 deraadt 143: usage();
144: }
1.25 miod 145: }
146:
1.1 deraadt 147: argv += optind;
148: argc -= optind;
149:
1.15 deraadt 150: if ((pidset && *argv) || (!pidset && !*argv && clear != CLEAR))
1.1 deraadt 151: usage();
1.25 miod 152:
1.1 deraadt 153: if (inherit)
154: trpoints |= KTRFAC_INHERIT;
155:
156: (void)signal(SIGSYS, no_ktrace);
157: if (clear != NOTSET) {
158: if (clear == CLEARALL) {
159: ops = KTROP_CLEAR | KTRFLAG_DESCEND;
160: trpoints = ALL_POINTS;
161: pid = 1;
162: } else
163: ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE;
164:
1.30 deraadt 165: if (ktrace(tracefile, ops, trpoints, pid) < 0) {
166: if (errno == ESRCH)
167: err(1, "%d", pid);
1.9 millert 168: err(1, "%s", tracefile);
1.30 deraadt 169: }
1.1 deraadt 170: exit(0);
171: }
172:
1.3 deraadt 173: omask = umask(S_IRWXG|S_IRWXO);
1.5 deraadt 174: if (append) {
175: if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0)
1.9 millert 176: err(1, "%s", tracefile);
1.5 deraadt 177: if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
178: errx(1, "Refuse to append to %s: not owned by you.",
179: tracefile);
180: } else {
181: if (unlink(tracefile) == -1 && errno != ENOENT)
182: err(1, "unlink %s", tracefile);
183: if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
184: DEFFILEMODE)) < 0)
1.9 millert 185: err(1, "%s", tracefile);
1.5 deraadt 186: }
1.3 deraadt 187: (void)umask(omask);
1.1 deraadt 188: (void)close(fd);
189:
190: if (*argv) {
1.25 miod 191: if (is_ltrace) {
192: if (setenv("LD_TRACE_PLT", inherit ? "i" : "", 1) < 0)
193: err(1, "setenv(LD_TRACE_PLT)");
194: if (tracespec &&
195: setenv("LD_TRACE_PLTSPEC", tracespec, 1) < 0)
196: err(1, "setenv(LD_TRACE_PLTSPEC)");
197: }
1.1 deraadt 198: if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
1.9 millert 199: err(1, "%s", tracefile);
1.1 deraadt 200: execvp(argv[0], &argv[0]);
201: err(1, "exec of '%s' failed", argv[0]);
202: }
1.30 deraadt 203: else if (ktrace(tracefile, ops, trpoints, pid) < 0) {
204: if (errno == ESRCH)
205: err(1, "%d", pid);
1.9 millert 206: err(1, "%s", tracefile);
1.30 deraadt 207: }
1.1 deraadt 208: exit(0);
209: }
210:
1.11 espie 211: static int
1.17 deraadt 212: rpid(const char *p)
1.1 deraadt 213: {
1.32 deraadt 214: const char *errstr;
1.1 deraadt 215: static int first;
1.32 deraadt 216: pid_t pid;
1.1 deraadt 217:
218: if (first++) {
219: warnx("only one -g or -p flag is permitted.");
220: usage();
221: }
222: if (!*p) {
223: warnx("illegal process id.");
224: usage();
225: }
1.32 deraadt 226: pid = strtonum(p, 1, INT_MAX, &errstr);
227: if (errstr) {
228: warnx("illegal process id: %s", errstr);
229: usage();
230: }
231: return pid;
1.1 deraadt 232: }
233:
1.11 espie 234: static void
1.17 deraadt 235: usage(void)
1.1 deraadt 236: {
1.25 miod 237: if (is_ltrace)
1.29 jmc 238: fprintf(stderr, "usage: %s [-ai] [-f trfile] [-t trstr]"
239: " [-u trspec] command\n",
1.25 miod 240: __progname);
241: else
242: fprintf(stderr, "usage: %s [-aBCcdi] [-f trfile] [-g pgid]"
243: " [-p pid] [-t trstr]\n"
244: " %s [-adi] [-f trfile] [-t trstr] command\n",
245: __progname, __progname);
1.1 deraadt 246: exit(1);
247: }
248:
1.18 deraadt 249: /* ARGSUSED */
1.11 espie 250: static void
1.17 deraadt 251: no_ktrace(int signo)
1.1 deraadt 252: {
1.12 deraadt 253: char buf[8192];
254:
255: snprintf(buf, sizeof(buf),
1.15 deraadt 256: "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'option KTRACE'\n");
1.12 deraadt 257: write(STDERR_FILENO, buf, strlen(buf));
258: _exit(1);
1.1 deraadt 259: }