1 /* $OpenBSD: ktrace.c,v 1.10 2001/07/12 05:17:13 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 38 static 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 45 static char sccsid[] = "@(#)ktrace.c 8.2 (Berkeley) 4/28/95"; 46 #endif 47 static char *rcsid = "$OpenBSD: ktrace.c,v 1.10 2001/07/12 05:17:13 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 65 void no_ktrace __P((int)); 66 void usage __P((void)); 67 68 int 69 main(argc, argv) 70 int argc; 71 char **argv; 72 { 73 enum { NOTSET, CLEAR, CLEARALL } clear; 74 int append, ch, fd, inherit, ops, pidset, trpoints; 75 pid_t pid; 76 char *tracefile; 77 mode_t omask; 78 struct stat sb; 79 80 clear = NOTSET; 81 append = ops = pidset = inherit = 0; 82 trpoints = DEF_POINTS; 83 tracefile = DEF_TRACEFILE; 84 while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1) 85 switch((char)ch) { 86 case 'a': 87 append = 1; 88 break; 89 case 'C': 90 clear = CLEARALL; 91 pidset = 1; 92 break; 93 case 'c': 94 clear = CLEAR; 95 break; 96 case 'd': 97 ops |= KTRFLAG_DESCEND; 98 break; 99 case 'f': 100 tracefile = optarg; 101 break; 102 case 'g': 103 pid = -rpid(optarg); 104 pidset = 1; 105 break; 106 case 'i': 107 inherit = 1; 108 break; 109 case 'p': 110 pid = rpid(optarg); 111 pidset = 1; 112 break; 113 case 't': 114 trpoints = getpoints(optarg); 115 if (trpoints < 0) { 116 warnx("unknown facility in %s", optarg); 117 usage(); 118 } 119 break; 120 default: 121 usage(); 122 } 123 argv += optind; 124 argc -= optind; 125 126 if (pidset && *argv || !pidset && !*argv) 127 usage(); 128 129 if (inherit) 130 trpoints |= KTRFAC_INHERIT; 131 132 (void)signal(SIGSYS, no_ktrace); 133 if (clear != NOTSET) { 134 if (clear == CLEARALL) { 135 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 136 trpoints = ALL_POINTS; 137 pid = 1; 138 } else 139 ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE; 140 141 if (ktrace(tracefile, ops, trpoints, pid) < 0) 142 err(1, "%s", tracefile); 143 exit(0); 144 } 145 146 omask = umask(S_IRWXG|S_IRWXO); 147 if (append) { 148 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0) 149 err(1, "%s", tracefile); 150 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 151 errx(1, "Refuse to append to %s: not owned by you.", 152 tracefile); 153 } else { 154 if (unlink(tracefile) == -1 && errno != ENOENT) 155 err(1, "unlink %s", tracefile); 156 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 157 DEFFILEMODE)) < 0) 158 err(1, "%s", tracefile); 159 } 160 (void)umask(omask); 161 (void)close(fd); 162 163 if (*argv) { 164 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 165 err(1, "%s", tracefile); 166 execvp(argv[0], &argv[0]); 167 err(1, "exec of '%s' failed", argv[0]); 168 } 169 else if (ktrace(tracefile, ops, trpoints, pid) < 0) 170 err(1, "%s", tracefile); 171 exit(0); 172 } 173 174 int 175 rpid(p) 176 char *p; 177 { 178 static int first; 179 180 if (first++) { 181 warnx("only one -g or -p flag is permitted."); 182 usage(); 183 } 184 if (!*p) { 185 warnx("illegal process id."); 186 usage(); 187 } 188 return(atoi(p)); 189 } 190 191 void 192 usage() 193 { 194 (void)fprintf(stderr, 195 "usage:\tktrace [-aCcid] [-f trfile] [-g pgid] [-p pid] [-t [cenis]\n\tktrace [-aCcid] [-f trfile] [-t [cenis] command\n"); 196 exit(1); 197 } 198 199 void 200 no_ktrace(sig) 201 int sig; 202 { 203 (void)fprintf(stderr, 204 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n"); 205 exit(1); 206 } 207