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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1988, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)ktrace.c 8.1 (Berkeley) 6/6/93 31 * $FreeBSD: src/usr.bin/ktrace/ktrace.c,v 1.12.2.3 2001/07/11 00:29:27 mikeh Exp $ 32 */ 33 34 #include <sys/param.h> 35 #include <sys/stat.h> 36 #include <sys/time.h> 37 #include <sys/errno.h> 38 #include <sys/ktrace.h> 39 40 #include <err.h> 41 #include <fcntl.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 46 #include "ktrace.h" 47 48 static void no_ktrace(int); 49 static int rpid(char *p); 50 static void usage(void); 51 52 int 53 main(int argc, char **argv) 54 { 55 enum { NOTSET, CLEAR, CLEARALL } clear; 56 int append, ch, fd, inherit, ops, pid, pidset, trpoints; 57 const char *tracefile; 58 mode_t omask; 59 struct stat sb; 60 61 clear = NOTSET; 62 append = ops = pid = pidset = inherit = 0; 63 trpoints = DEF_POINTS; 64 tracefile = DEF_TRACEFILE; 65 while ((ch = getopt(argc, argv, "aCcdf:g:ip:t:")) != -1) 66 switch(ch) { 67 case 'a': 68 append = 1; 69 break; 70 case 'C': 71 clear = CLEARALL; 72 pidset = 1; 73 break; 74 case 'c': 75 clear = CLEAR; 76 break; 77 case 'd': 78 ops |= KTRFLAG_DESCEND; 79 break; 80 case 'f': 81 tracefile = optarg; 82 break; 83 case 'g': 84 pid = -rpid(optarg); 85 pidset = 1; 86 break; 87 case 'i': 88 inherit = 1; 89 break; 90 case 'p': 91 pid = rpid(optarg); 92 pidset = 1; 93 break; 94 case 't': 95 trpoints = getpoints(optarg); 96 if (trpoints < 0) { 97 warnx("unknown facility in %s", optarg); 98 usage(); 99 } 100 break; 101 default: 102 usage(); 103 } 104 argv += optind; 105 argc -= optind; 106 107 if ((pidset && *argv) || (!pidset && clear == NOTSET && !*argv)) 108 usage(); 109 110 if (inherit) 111 trpoints |= KTRFAC_INHERIT; 112 113 signal(SIGSYS, no_ktrace); 114 if (clear != NOTSET) { 115 if (clear == CLEARALL) { 116 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 117 trpoints = ALL_POINTS; 118 pid = 1; 119 } else 120 ops |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE; 121 122 if (ktrace(tracefile, ops, trpoints, pid) < 0) 123 err(1, "%s", tracefile); 124 exit(0); 125 } 126 127 omask = umask(S_IRWXG|S_IRWXO); 128 if (append) { 129 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0) 130 err(1, "%s", tracefile); 131 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 132 errx(1, "Refuse to append to %s not owned by you.", 133 tracefile); 134 } else { 135 if (unlink(tracefile) == -1 && errno != ENOENT) 136 err(1, "unlink %s", tracefile); 137 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 138 DEFFILEMODE)) < 0) 139 err(1, "%s", tracefile); 140 } 141 umask(omask); 142 close(fd); 143 144 if (*argv) { 145 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 146 err(1, "%s", tracefile); 147 execvp(argv[0], &argv[0]); 148 err(1, "exec of '%s' failed", argv[0]); 149 } 150 else if (ktrace(tracefile, ops, trpoints, pid) < 0) 151 err(1, "%s", tracefile); 152 exit(0); 153 } 154 155 static int 156 rpid(char *p) 157 { 158 static int first; 159 160 if (first++) { 161 warnx("only one -g or -p flag is permitted."); 162 usage(); 163 } 164 if (!*p) { 165 warnx("illegal process id."); 166 usage(); 167 } 168 return(atoi(p)); 169 } 170 171 static void 172 usage(void) 173 { 174 fprintf(stderr, "%s\n%s\n", 175 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t cnisuw]", 176 " ktrace [-adi] [-f trfile] [-t cnisuw] command"); 177 exit(1); 178 } 179 180 static void 181 no_ktrace(int sig __unused) 182 { 183 fprintf(stderr, 184 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n"); 185 exit(1); 186 } 187