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 #include <sys/param.h> 33 #include <sys/file.h> 34 #include <sys/stat.h> 35 #include <sys/time.h> 36 #include <sys/uio.h> 37 #include <sys/ktrace.h> 38 39 #include <err.h> 40 #include <errno.h> 41 #include <inttypes.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 46 #include "ktrace.h" 47 48 static char def_tracefile[] = DEF_TRACEFILE; 49 50 static enum clear { NOTSET, CLEAR, CLEARALL } clear = NOTSET; 51 static int pid; 52 53 static void no_ktrace(int); 54 static void set_pid_clear(const char *, enum clear); 55 static void usage(void) __dead2; 56 57 int 58 main(int argc, char *argv[]) 59 { 60 int append, ch, fd, inherit, ops, trpoints; 61 const char *tracefile; 62 mode_t omask; 63 struct stat sb; 64 65 append = ops = inherit = 0; 66 trpoints = DEF_POINTS; 67 tracefile = def_tracefile; 68 while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1) 69 switch((char)ch) { 70 case 'a': 71 append = 1; 72 break; 73 case 'C': 74 set_pid_clear("1", CLEARALL); 75 break; 76 case 'c': 77 set_pid_clear(NULL, CLEAR); 78 break; 79 case 'd': 80 ops |= KTRFLAG_DESCEND; 81 break; 82 case 'f': 83 tracefile = optarg; 84 break; 85 case 'g': 86 set_pid_clear(optarg, NOTSET); 87 pid = -pid; 88 break; 89 case 'i': 90 inherit = 1; 91 break; 92 case 'p': 93 set_pid_clear(optarg, NOTSET); 94 break; 95 case 't': 96 trpoints = getpoints(optarg); 97 if (trpoints < 0) { 98 warnx("unknown facility in %s", optarg); 99 usage(); 100 } 101 break; 102 default: 103 usage(); 104 } 105 106 argv += optind; 107 argc -= optind; 108 109 /* must have either -[Cc], a pid or a command */ 110 if (clear == NOTSET && pid == 0 && argc == 0) 111 usage(); 112 /* can't have both a pid and a command */ 113 /* (note that -C sets pid to 1) */ 114 if (pid != 0 && argc > 0) { 115 usage(); 116 } 117 118 if (inherit) 119 trpoints |= KTRFAC_INHERIT; 120 121 (void)signal(SIGSYS, no_ktrace); 122 if (clear != NOTSET) { 123 if (clear == CLEARALL) { 124 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 125 trpoints = ALL_POINTS; 126 } else { 127 ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE; 128 } 129 if (ktrace(tracefile, ops, trpoints, pid) < 0) 130 err(1, "%s", tracefile); 131 exit(0); 132 } 133 134 omask = umask(S_IRWXG|S_IRWXO); 135 if (append) { 136 if ((fd = open(tracefile, O_CREAT | O_WRONLY | O_NONBLOCK, 137 DEFFILEMODE)) < 0) 138 err(1, "%s", tracefile); 139 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 140 errx(1, "refuse to append to %s not owned by you", 141 tracefile); 142 if (!(S_ISREG(sb.st_mode))) 143 errx(1, "%s not regular file", tracefile); 144 } else { 145 if (unlink(tracefile) == -1 && errno != ENOENT) 146 err(1, "unlink %s", tracefile); 147 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 148 DEFFILEMODE)) < 0) 149 err(1, "%s", tracefile); 150 } 151 (void)umask(omask); 152 (void)close(fd); 153 154 trpoints |= PROC_ABI_POINTS; 155 156 if (argc > 0) { 157 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 158 err(1, "%s", tracefile); 159 execvp(*argv, argv); 160 err(1, "exec of '%s' failed", *argv); 161 } 162 if (ktrace(tracefile, ops, trpoints, pid) < 0) 163 err(1, "%s", tracefile); 164 exit(0); 165 } 166 167 static void 168 set_pid_clear(const char *p, enum clear cl) 169 { 170 intmax_t n; 171 char *e; 172 173 if (clear != NOTSET && cl != NOTSET) { 174 /* either -c and -C or either of them twice */ 175 warnx("only one -c or -C flag is permitted"); 176 usage(); 177 } 178 if ((clear == CLEARALL && p != NULL) || (cl == CLEARALL && pid != 0)) { 179 /* both -C and a pid or pgid */ 180 warnx("the -C flag may not be combined with -g or -p"); 181 usage(); 182 } 183 if (p != NULL && pid != 0) { 184 /* either -p and -g or either of them twice */ 185 warnx("only one -g or -p flag is permitted"); 186 usage(); 187 } 188 if (p != NULL) { 189 errno = 0; 190 n = strtoimax(p, &e, 10); 191 /* 192 * 1) not a number, or outside the range of an intmax_t 193 * 2) inside the range of intmax_t but outside the range 194 * of an int, keeping in mind that the pid may be 195 * negated if it's actually a pgid. 196 */ 197 if (*e != '\0' || n < 1 || errno == ERANGE || 198 n > (intmax_t)INT_MAX || n > -(intmax_t)INT_MIN) { 199 warnx("invalid process or group id"); 200 usage(); 201 } 202 pid = n; 203 } 204 if (cl != NOTSET) 205 if ((clear = cl) == CLEARALL) 206 pid = 1; 207 } 208 209 static void 210 usage(void) 211 { 212 213 fprintf(stderr, "%s\n%s\n", 214 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t trstr]", 215 " ktrace [-adi] [-f trfile] [-t trstr] command"); 216 exit(1); 217 } 218 219 static void 220 no_ktrace(int sig __unused) 221 { 222 223 fprintf(stderr, "error:\t%s\n\t%s\n", 224 "ktrace() system call not supported in the running kernel", 225 "re-compile kernel with 'options KTRACE'"); 226 exit(1); 227 } 228