ktrace.c revision 1.12
1/* $OpenBSD: ktrace.c,v 1.12 2001/11/14 20:00:48 deraadt Exp $ */ 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. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#ifndef lint 38static char copyright[] = 39"@(#) Copyright (c) 1988, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41#endif /* not lint */ 42 43#ifndef lint 44#if 0 45static char sccsid[] = "@(#)ktrace.c 8.2 (Berkeley) 4/28/95"; 46#endif 47static char *rcsid = "$OpenBSD: ktrace.c,v 1.12 2001/11/14 20:00:48 deraadt Exp $"; 48#endif /* not lint */ 49 50#include <sys/param.h> 51#include <sys/stat.h> 52#include <sys/time.h> 53#include <sys/errno.h> 54#include <sys/uio.h> 55#include <sys/ktrace.h> 56 57#include <err.h> 58#include <fcntl.h> 59#include <stdlib.h> 60#include <stdio.h> 61#include <unistd.h> 62 63#include "ktrace.h" 64#include "extern.h" 65 66static int rpid __P((const char *)); 67static void no_ktrace __P((int)); 68static void usage __P((void)); 69 70int 71main(argc, argv) 72 int argc; 73 char **argv; 74{ 75 enum { NOTSET, CLEAR, CLEARALL } clear; 76 int append, ch, fd, inherit, ops, pidset, trpoints; 77 pid_t pid; 78 char *tracefile; 79 mode_t omask; 80 struct stat sb; 81 82 clear = NOTSET; 83 append = ops = pidset = inherit = 0; 84 trpoints = DEF_POINTS; 85 tracefile = DEF_TRACEFILE; 86 while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1) 87 switch((char)ch) { 88 case 'a': 89 append = 1; 90 break; 91 case 'C': 92 clear = CLEARALL; 93 pidset = 1; 94 break; 95 case 'c': 96 clear = CLEAR; 97 break; 98 case 'd': 99 ops |= KTRFLAG_DESCEND; 100 break; 101 case 'f': 102 tracefile = optarg; 103 break; 104 case 'g': 105 pid = -rpid(optarg); 106 pidset = 1; 107 break; 108 case 'i': 109 inherit = 1; 110 break; 111 case 'p': 112 pid = rpid(optarg); 113 pidset = 1; 114 break; 115 case 't': 116 trpoints = getpoints(optarg); 117 if (trpoints < 0) { 118 warnx("unknown facility in %s", optarg); 119 usage(); 120 } 121 break; 122 default: 123 usage(); 124 } 125 argv += optind; 126 argc -= optind; 127 128 if ((pidset && *argv) || (!pidset && !*argv)) 129 usage(); 130 131 if (inherit) 132 trpoints |= KTRFAC_INHERIT; 133 134 (void)signal(SIGSYS, no_ktrace); 135 if (clear != NOTSET) { 136 if (clear == CLEARALL) { 137 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 138 trpoints = ALL_POINTS; 139 pid = 1; 140 } else 141 ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE; 142 143 if (ktrace(tracefile, ops, trpoints, pid) < 0) 144 err(1, "%s", tracefile); 145 exit(0); 146 } 147 148 omask = umask(S_IRWXG|S_IRWXO); 149 if (append) { 150 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0) 151 err(1, "%s", tracefile); 152 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 153 errx(1, "Refuse to append to %s: not owned by you.", 154 tracefile); 155 } else { 156 if (unlink(tracefile) == -1 && errno != ENOENT) 157 err(1, "unlink %s", tracefile); 158 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 159 DEFFILEMODE)) < 0) 160 err(1, "%s", tracefile); 161 } 162 (void)umask(omask); 163 (void)close(fd); 164 165 if (*argv) { 166 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 167 err(1, "%s", tracefile); 168 execvp(argv[0], &argv[0]); 169 err(1, "exec of '%s' failed", argv[0]); 170 } 171 else if (ktrace(tracefile, ops, trpoints, pid) < 0) 172 err(1, "%s", tracefile); 173 exit(0); 174} 175 176static int 177rpid(p) 178 const char *p; 179{ 180 static int first; 181 182 if (first++) { 183 warnx("only one -g or -p flag is permitted."); 184 usage(); 185 } 186 if (!*p) { 187 warnx("illegal process id."); 188 usage(); 189 } 190 return(atoi(p)); 191} 192 193static void 194usage() 195{ 196 (void)fprintf(stderr, 197"usage:\tktrace [-aCcid] [-f trfile] [-g pgid] [-p pid] [-t [cenis]\n\tktrace [-aCcid] [-f trfile] [-t [cenis] command\n"); 198 exit(1); 199} 200 201static void 202no_ktrace(sig) 203 int sig; 204{ 205 char buf[8192]; 206 207 snprintf(buf, sizeof(buf), 208"error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n"); 209 write(STDERR_FILENO, buf, strlen(buf)); 210 _exit(1); 211} 212