Annotation of src/usr.bin/ktrace/ktrace.c, Revision 1.36
1.36 ! deraadt 1: /* $OpenBSD: ktrace.c,v 1.35 2019/01/06 18:30:36 tedu 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;
1.35 tedu 113: tracefile = NULL;
1.25 miod 114: pidset = 1;
115: break;
116: case 'c':
117: clear = CLEAR;
118: break;
119: case 'd':
120: ops |= KTRFLAG_DESCEND;
121: break;
122: case 'f':
123: tracefile = optarg;
124: break;
125: case 'g':
126: pid = -rpid(optarg);
127: pidset = 1;
128: break;
129: case 'i':
130: inherit = 1;
131: break;
132: case 'p':
133: pid = rpid(optarg);
134: pidset = 1;
135: break;
136: case 't':
1.33 guenther 137: trpoints = getpoints(optarg, DEF_POINTS);
1.25 miod 138: if (trpoints < 0) {
139: warnx("unknown facility in %s", optarg);
140: usage();
141: }
142: break;
143: default:
1.1 deraadt 144: usage();
145: }
1.25 miod 146: }
147:
1.1 deraadt 148: argv += optind;
149: argc -= optind;
150:
1.15 deraadt 151: if ((pidset && *argv) || (!pidset && !*argv && clear != CLEAR))
1.1 deraadt 152: usage();
1.25 miod 153:
1.1 deraadt 154: if (inherit)
155: trpoints |= KTRFAC_INHERIT;
156:
157: (void)signal(SIGSYS, no_ktrace);
158: if (clear != NOTSET) {
159: if (clear == CLEARALL) {
160: ops = KTROP_CLEAR | KTRFLAG_DESCEND;
161: trpoints = ALL_POINTS;
162: pid = 1;
163: } else
164: ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE;
165:
1.36 ! deraadt 166: if (ktrace(tracefile, ops, trpoints, pid) == -1) {
1.30 deraadt 167: if (errno == ESRCH)
168: err(1, "%d", pid);
1.9 millert 169: err(1, "%s", tracefile);
1.30 deraadt 170: }
1.1 deraadt 171: exit(0);
172: }
173:
1.3 deraadt 174: omask = umask(S_IRWXG|S_IRWXO);
1.5 deraadt 175: if (append) {
1.36 ! deraadt 176: if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) == -1)
1.9 millert 177: err(1, "%s", tracefile);
1.5 deraadt 178: if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
179: errx(1, "Refuse to append to %s: not owned by you.",
180: tracefile);
181: } else {
182: if (unlink(tracefile) == -1 && errno != ENOENT)
183: err(1, "unlink %s", tracefile);
184: if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
1.36 ! deraadt 185: DEFFILEMODE)) == -1)
1.9 millert 186: err(1, "%s", tracefile);
1.5 deraadt 187: }
1.3 deraadt 188: (void)umask(omask);
1.1 deraadt 189: (void)close(fd);
190:
191: if (*argv) {
1.25 miod 192: if (is_ltrace) {
193: if (setenv("LD_TRACE_PLT", inherit ? "i" : "", 1) < 0)
194: err(1, "setenv(LD_TRACE_PLT)");
195: if (tracespec &&
196: setenv("LD_TRACE_PLTSPEC", tracespec, 1) < 0)
197: err(1, "setenv(LD_TRACE_PLTSPEC)");
198: }
1.36 ! deraadt 199: if (ktrace(tracefile, ops, trpoints, getpid()) == -1)
1.9 millert 200: err(1, "%s", tracefile);
1.1 deraadt 201: execvp(argv[0], &argv[0]);
202: err(1, "exec of '%s' failed", argv[0]);
203: }
1.36 ! deraadt 204: else if (ktrace(tracefile, ops, trpoints, pid) == -1) {
1.30 deraadt 205: if (errno == ESRCH)
206: err(1, "%d", pid);
1.9 millert 207: err(1, "%s", tracefile);
1.30 deraadt 208: }
1.1 deraadt 209: exit(0);
210: }
211:
1.11 espie 212: static int
1.17 deraadt 213: rpid(const char *p)
1.1 deraadt 214: {
1.32 deraadt 215: const char *errstr;
1.1 deraadt 216: static int first;
1.32 deraadt 217: pid_t pid;
1.1 deraadt 218:
219: if (first++) {
220: warnx("only one -g or -p flag is permitted.");
221: usage();
222: }
223: if (!*p) {
224: warnx("illegal process id.");
225: usage();
226: }
1.32 deraadt 227: pid = strtonum(p, 1, INT_MAX, &errstr);
228: if (errstr) {
229: warnx("illegal process id: %s", errstr);
230: usage();
231: }
232: return pid;
1.1 deraadt 233: }
234:
1.11 espie 235: static void
1.17 deraadt 236: usage(void)
1.1 deraadt 237: {
1.25 miod 238: if (is_ltrace)
1.29 jmc 239: fprintf(stderr, "usage: %s [-ai] [-f trfile] [-t trstr]"
240: " [-u trspec] command\n",
1.25 miod 241: __progname);
242: else
243: fprintf(stderr, "usage: %s [-aBCcdi] [-f trfile] [-g pgid]"
244: " [-p pid] [-t trstr]\n"
245: " %s [-adi] [-f trfile] [-t trstr] command\n",
246: __progname, __progname);
1.1 deraadt 247: exit(1);
248: }
249:
1.18 deraadt 250: /* ARGSUSED */
1.11 espie 251: static void
1.17 deraadt 252: no_ktrace(int signo)
1.1 deraadt 253: {
1.34 awolk 254: dprintf(STDERR_FILENO,
1.15 deraadt 255: "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'option KTRACE'\n");
1.12 deraadt 256: _exit(1);
1.1 deraadt 257: }
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