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 #endif 40 41 #include <sys/cdefs.h> 42 #include <sys/param.h> 43 #include <sys/file.h> 44 #include <sys/stat.h> 45 #include <sys/time.h> 46 #include <sys/uio.h> 47 #include <sys/ktrace.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <inttypes.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <unistd.h> 55 56 #include "ktrace.h" 57 58 static char def_tracefile[] = DEF_TRACEFILE; 59 60 static enum clear { NOTSET, CLEAR, CLEARALL } clear = NOTSET; 61 static int pid; 62 63 static void no_ktrace(int); 64 static void set_pid_clear(const char *, enum clear); 65 static void usage(void) __dead2; 66 67 int 68 main(int argc, char *argv[]) 69 { 70 int append, ch, fd, inherit, ops, trpoints; 71 const char *tracefile; 72 mode_t omask; 73 struct stat sb; 74 75 append = ops = inherit = 0; 76 trpoints = DEF_POINTS; 77 tracefile = def_tracefile; 78 while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1) 79 switch((char)ch) { 80 case 'a': 81 append = 1; 82 break; 83 case 'C': 84 set_pid_clear("1", CLEARALL); 85 break; 86 case 'c': 87 set_pid_clear(NULL, CLEAR); 88 break; 89 case 'd': 90 ops |= KTRFLAG_DESCEND; 91 break; 92 case 'f': 93 tracefile = optarg; 94 break; 95 case 'g': 96 set_pid_clear(optarg, NOTSET); 97 pid = -pid; 98 break; 99 case 'i': 100 inherit = 1; 101 break; 102 case 'p': 103 set_pid_clear(optarg, NOTSET); 104 break; 105 case 't': 106 trpoints = getpoints(optarg); 107 if (trpoints < 0) { 108 warnx("unknown facility in %s", optarg); 109 usage(); 110 } 111 break; 112 default: 113 usage(); 114 } 115 116 argv += optind; 117 argc -= optind; 118 119 /* must have either -[Cc], a pid or a command */ 120 if (clear == NOTSET && pid == 0 && argc == 0) 121 usage(); 122 /* can't have both a pid and a command */ 123 /* (note that -C sets pid to 1) */ 124 if (pid != 0 && argc > 0) { 125 usage(); 126 } 127 128 if (inherit) 129 trpoints |= KTRFAC_INHERIT; 130 131 (void)signal(SIGSYS, no_ktrace); 132 if (clear != NOTSET) { 133 if (clear == CLEARALL) { 134 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 135 trpoints = ALL_POINTS; 136 } else { 137 ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE; 138 } 139 if (ktrace(tracefile, ops, trpoints, pid) < 0) 140 err(1, "%s", tracefile); 141 exit(0); 142 } 143 144 omask = umask(S_IRWXG|S_IRWXO); 145 if (append) { 146 if ((fd = open(tracefile, O_CREAT | O_WRONLY | O_NONBLOCK, 147 DEFFILEMODE)) < 0) 148 err(1, "%s", tracefile); 149 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 150 errx(1, "refuse to append to %s not owned by you", 151 tracefile); 152 if (!(S_ISREG(sb.st_mode))) 153 errx(1, "%s not regular file", tracefile); 154 } else { 155 if (unlink(tracefile) == -1 && errno != ENOENT) 156 err(1, "unlink %s", tracefile); 157 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 158 DEFFILEMODE)) < 0) 159 err(1, "%s", tracefile); 160 } 161 (void)umask(omask); 162 (void)close(fd); 163 164 trpoints |= PROC_ABI_POINTS; 165 166 if (argc > 0) { 167 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 168 err(1, "%s", tracefile); 169 execvp(*argv, argv); 170 err(1, "exec of '%s' failed", *argv); 171 } 172 if (ktrace(tracefile, ops, trpoints, pid) < 0) 173 err(1, "%s", tracefile); 174 exit(0); 175 } 176 177 static void 178 set_pid_clear(const char *p, enum clear cl) 179 { 180 intmax_t n; 181 char *e; 182 183 if (clear != NOTSET && cl != NOTSET) { 184 /* either -c and -C or either of them twice */ 185 warnx("only one -c or -C flag is permitted"); 186 usage(); 187 } 188 if ((clear == CLEARALL && p != NULL) || (cl == CLEARALL && pid != 0)) { 189 /* both -C and a pid or pgid */ 190 warnx("the -C flag may not be combined with -g or -p"); 191 usage(); 192 } 193 if (p != NULL && pid != 0) { 194 /* either -p and -g or either of them twice */ 195 warnx("only one -g or -p flag is permitted"); 196 usage(); 197 } 198 if (p != NULL) { 199 errno = 0; 200 n = strtoimax(p, &e, 10); 201 /* 202 * 1) not a number, or outside the range of an intmax_t 203 * 2) inside the range of intmax_t but outside the range 204 * of an int, keeping in mind that the pid may be 205 * negated if it's actually a pgid. 206 */ 207 if (*e != '\0' || n < 1 || errno == ERANGE || 208 n > (intmax_t)INT_MAX || n > -(intmax_t)INT_MIN) { 209 warnx("invalid process or group id"); 210 usage(); 211 } 212 pid = n; 213 } 214 if (cl != NOTSET) 215 if ((clear = cl) == CLEARALL) 216 pid = 1; 217 } 218 219 static void 220 usage(void) 221 { 222 223 fprintf(stderr, "%s\n%s\n", 224 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t trstr]", 225 " ktrace [-adi] [-f trfile] [-t trstr] command"); 226 exit(1); 227 } 228 229 static void 230 no_ktrace(int sig __unused) 231 { 232 233 fprintf(stderr, "error:\t%s\n\t%s\n", 234 "ktrace() system call not supported in the running kernel", 235 "re-compile kernel with 'options KTRACE'"); 236 exit(1); 237 } 238