1 /*- 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1988, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)ktrace.c 8.1 (Berkeley) 6/6/93 35 * $FreeBSD: src/usr.bin/ktrace/ktrace.c,v 1.12.2.3 2001/07/11 00:29:27 mikeh Exp $ 36 * $DragonFly: src/usr.bin/ktrace/ktrace.c,v 1.3 2003/10/04 20:36:46 hmp Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/stat.h> 41 #include <sys/file.h> 42 #include <sys/time.h> 43 #include <sys/errno.h> 44 #include <sys/uio.h> 45 #include <sys/ktrace.h> 46 47 #include <err.h> 48 #include <stdio.h> 49 #include <unistd.h> 50 51 #include "ktrace.h" 52 53 void no_ktrace(int); 54 void usage(void); 55 56 main(int argc, char **argv) 57 { 58 enum { NOTSET, CLEAR, CLEARALL } clear; 59 int append, ch, fd, inherit, ops, pid, pidset, trpoints; 60 char *tracefile; 61 mode_t omask; 62 struct stat sb; 63 64 clear = NOTSET; 65 append = ops = pidset = 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 clear = CLEARALL; 75 pidset = 1; 76 break; 77 case 'c': 78 clear = CLEAR; 79 break; 80 case 'd': 81 ops |= KTRFLAG_DESCEND; 82 break; 83 case 'f': 84 tracefile = optarg; 85 break; 86 case 'g': 87 pid = -rpid(optarg); 88 pidset = 1; 89 break; 90 case 'i': 91 inherit = 1; 92 break; 93 case 'p': 94 pid = rpid(optarg); 95 pidset = 1; 96 break; 97 case 't': 98 trpoints = getpoints(optarg); 99 if (trpoints < 0) { 100 warnx("unknown facility in %s", optarg); 101 usage(); 102 } 103 break; 104 default: 105 usage(); 106 } 107 argv += optind; 108 argc -= optind; 109 110 if (pidset && *argv || !pidset && !*argv) 111 usage(); 112 113 if (inherit) 114 trpoints |= KTRFAC_INHERIT; 115 116 (void)signal(SIGSYS, no_ktrace); 117 if (clear != NOTSET) { 118 if (clear == CLEARALL) { 119 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 120 trpoints = ALL_POINTS; 121 pid = 1; 122 } else 123 ops |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE; 124 125 if (ktrace(tracefile, ops, trpoints, pid) < 0) 126 err(1, "%s", tracefile); 127 exit(0); 128 } 129 130 omask = umask(S_IRWXG|S_IRWXO); 131 if (append) { 132 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0) 133 err(1, "%s", tracefile); 134 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 135 errx(1, "Refuse to append to %s not owned by you.", 136 tracefile); 137 } else { 138 if (unlink(tracefile) == -1 && errno != ENOENT) 139 err(1, "unlink %s", tracefile); 140 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 141 DEFFILEMODE)) < 0) 142 err(1, "%s", tracefile); 143 } 144 (void)umask(omask); 145 (void)close(fd); 146 147 if (*argv) { 148 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 149 err(1, "%s", tracefile); 150 execvp(argv[0], &argv[0]); 151 err(1, "exec of '%s' failed", argv[0]); 152 } 153 else if (ktrace(tracefile, ops, trpoints, pid) < 0) 154 err(1, "%s", tracefile); 155 exit(0); 156 } 157 158 rpid(char *p) 159 { 160 static int first; 161 162 if (first++) { 163 warnx("only one -g or -p flag is permitted."); 164 usage(); 165 } 166 if (!*p) { 167 warnx("illegal process id."); 168 usage(); 169 } 170 return(atoi(p)); 171 } 172 173 void 174 usage(void) 175 { 176 (void)fprintf(stderr, "%s\n%s\n", 177 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t cnisuw]", 178 " ktrace [-adi] [-f trfile] [-t cnisuw] command"); 179 exit(1); 180 } 181 182 void 183 no_ktrace(int sig) 184 { 185 (void)fprintf(stderr, 186 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n"); 187 exit(1); 188 } 189