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 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1988, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #if 0 39 #ifndef lint 40 static char sccsid[] = "@(#)ktrace.c 8.1 (Berkeley) 6/6/93"; 41 #endif /* not lint */ 42 #endif 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 #include <sys/param.h> 48 #include <sys/file.h> 49 #include <sys/stat.h> 50 #include <sys/time.h> 51 #include <sys/uio.h> 52 #include <sys/ktrace.h> 53 54 #include <err.h> 55 #include <errno.h> 56 #include <inttypes.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <unistd.h> 60 61 #include "ktrace.h" 62 63 static char def_tracefile[] = DEF_TRACEFILE; 64 65 static enum clear { NOTSET, CLEAR, CLEARALL } clear = NOTSET; 66 static int pid; 67 68 static void no_ktrace(int); 69 static void set_pid_clear(const char *, enum clear); 70 static void usage(void); 71 72 int 73 main(int argc, char *argv[]) 74 { 75 int append, ch, fd, inherit, ops, trpoints; 76 const char *tracefile; 77 mode_t omask; 78 struct stat sb; 79 80 append = ops = inherit = 0; 81 trpoints = DEF_POINTS; 82 tracefile = def_tracefile; 83 while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1) 84 switch((char)ch) { 85 case 'a': 86 append = 1; 87 break; 88 case 'C': 89 set_pid_clear("1", CLEARALL); 90 break; 91 case 'c': 92 set_pid_clear(NULL, CLEAR); 93 break; 94 case 'd': 95 ops |= KTRFLAG_DESCEND; 96 break; 97 case 'f': 98 tracefile = optarg; 99 break; 100 case 'g': 101 set_pid_clear(optarg, NOTSET); 102 pid = -pid; 103 break; 104 case 'i': 105 inherit = 1; 106 break; 107 case 'p': 108 set_pid_clear(optarg, NOTSET); 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 } 120 121 argv += optind; 122 argc -= optind; 123 124 /* must have either -[Cc], a pid or a command */ 125 if (clear == NOTSET && pid == 0 && argc == 0) 126 usage(); 127 /* can't have both a pid and a command */ 128 /* (note that -C sets pid to 1) */ 129 if (pid != 0 && argc > 0) { 130 usage(); 131 } 132 133 if (inherit) 134 trpoints |= KTRFAC_INHERIT; 135 136 (void)signal(SIGSYS, no_ktrace); 137 if (clear != NOTSET) { 138 if (clear == CLEARALL) { 139 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 140 trpoints = ALL_POINTS; 141 } else { 142 ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE; 143 } 144 if (ktrace(tracefile, ops, trpoints, pid) < 0) 145 err(1, "%s", tracefile); 146 exit(0); 147 } 148 149 omask = umask(S_IRWXG|S_IRWXO); 150 if (append) { 151 if ((fd = open(tracefile, O_CREAT | O_WRONLY | O_NONBLOCK, 152 DEFFILEMODE)) < 0) 153 err(1, "%s", tracefile); 154 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 155 errx(1, "refuse to append to %s not owned by you", 156 tracefile); 157 if (!(S_ISREG(sb.st_mode))) 158 errx(1, "%s not regular file", tracefile); 159 } else { 160 if (unlink(tracefile) == -1 && errno != ENOENT) 161 err(1, "unlink %s", tracefile); 162 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 163 DEFFILEMODE)) < 0) 164 err(1, "%s", tracefile); 165 } 166 (void)umask(omask); 167 (void)close(fd); 168 169 trpoints |= PROC_ABI_POINTS; 170 171 if (argc > 0) { 172 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 173 err(1, "%s", tracefile); 174 execvp(*argv, argv); 175 err(1, "exec of '%s' failed", *argv); 176 } 177 if (ktrace(tracefile, ops, trpoints, pid) < 0) 178 err(1, "%s", tracefile); 179 exit(0); 180 } 181 182 static void 183 set_pid_clear(const char *p, enum clear cl) 184 { 185 intmax_t n; 186 char *e; 187 188 if (clear != NOTSET && cl != NOTSET) { 189 /* either -c and -C or either of them twice */ 190 warnx("only one -c or -C flag is permitted"); 191 usage(); 192 } 193 if ((clear == CLEARALL && p != NULL) || (cl == CLEARALL && pid != 0)) { 194 /* both -C and a pid or pgid */ 195 warnx("the -C flag may not be combined with -g or -p"); 196 usage(); 197 } 198 if (p != NULL && pid != 0) { 199 /* either -p and -g or either of them twice */ 200 warnx("only one -g or -p flag is permitted"); 201 usage(); 202 } 203 if (p != NULL) { 204 errno = 0; 205 n = strtoimax(p, &e, 10); 206 /* 207 * 1) not a number, or outside the range of an intmax_t 208 * 2) inside the range of intmax_t but outside the range 209 * of an int, keeping in mind that the pid may be 210 * negated if it's actually a pgid. 211 */ 212 if (*e != '\0' || n < 1 || errno == ERANGE || 213 n > (intmax_t)INT_MAX || n > -(intmax_t)INT_MIN) { 214 warnx("invalid process or group id"); 215 usage(); 216 } 217 pid = n; 218 } 219 if (cl != NOTSET) 220 if ((clear = cl) == CLEARALL) 221 pid = 1; 222 } 223 224 static void 225 usage(void) 226 { 227 228 fprintf(stderr, "%s\n%s\n", 229 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t trstr]", 230 " ktrace [-adi] [-f trfile] [-t trstr] command"); 231 exit(1); 232 } 233 234 static void 235 no_ktrace(int sig __unused) 236 { 237 238 fprintf(stderr, "error:\t%s\n\t%s\n", 239 "ktrace() system call not supported in the running kernel", 240 "re-compile kernel with 'options KTRACE'"); 241 exit(1); 242 } 243