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 1.4 2005/06/01 03:05:40 swildner 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 <stdlib.h> 50 #include <unistd.h> 51 52 #include "ktrace.h" 53 54 static void no_ktrace(int); 55 static int rpid(char *p); 56 static void usage(void); 57 58 int 59 main(int argc, char **argv) 60 { 61 enum { NOTSET, CLEAR, CLEARALL } clear; 62 int append, ch, fd, inherit, ops, pid, pidset, trpoints; 63 const char *tracefile; 64 mode_t omask; 65 struct stat sb; 66 67 clear = NOTSET; 68 append = ops = pid = pidset = inherit = 0; 69 trpoints = DEF_POINTS; 70 tracefile = DEF_TRACEFILE; 71 while ((ch = getopt(argc, argv, "aCcdf:g:ip:t:")) != -1) 72 switch(ch) { 73 case 'a': 74 append = 1; 75 break; 76 case 'C': 77 clear = CLEARALL; 78 pidset = 1; 79 break; 80 case 'c': 81 clear = CLEAR; 82 break; 83 case 'd': 84 ops |= KTRFLAG_DESCEND; 85 break; 86 case 'f': 87 tracefile = optarg; 88 break; 89 case 'g': 90 pid = -rpid(optarg); 91 pidset = 1; 92 break; 93 case 'i': 94 inherit = 1; 95 break; 96 case 'p': 97 pid = rpid(optarg); 98 pidset = 1; 99 break; 100 case 't': 101 trpoints = getpoints(optarg); 102 if (trpoints < 0) { 103 warnx("unknown facility in %s", optarg); 104 usage(); 105 } 106 break; 107 default: 108 usage(); 109 } 110 argv += optind; 111 argc -= optind; 112 113 if ((pidset && *argv) || (!pidset && !*argv)) 114 usage(); 115 116 if (inherit) 117 trpoints |= KTRFAC_INHERIT; 118 119 signal(SIGSYS, no_ktrace); 120 if (clear != NOTSET) { 121 if (clear == CLEARALL) { 122 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 123 trpoints = ALL_POINTS; 124 pid = 1; 125 } else 126 ops |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE; 127 128 if (ktrace(tracefile, ops, trpoints, pid) < 0) 129 err(1, "%s", tracefile); 130 exit(0); 131 } 132 133 omask = umask(S_IRWXG|S_IRWXO); 134 if (append) { 135 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0) 136 err(1, "%s", tracefile); 137 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 138 errx(1, "Refuse to append to %s not owned by you.", 139 tracefile); 140 } else { 141 if (unlink(tracefile) == -1 && errno != ENOENT) 142 err(1, "unlink %s", tracefile); 143 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 144 DEFFILEMODE)) < 0) 145 err(1, "%s", tracefile); 146 } 147 umask(omask); 148 close(fd); 149 150 if (*argv) { 151 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 152 err(1, "%s", tracefile); 153 execvp(argv[0], &argv[0]); 154 err(1, "exec of '%s' failed", argv[0]); 155 } 156 else if (ktrace(tracefile, ops, trpoints, pid) < 0) 157 err(1, "%s", tracefile); 158 exit(0); 159 } 160 161 static int 162 rpid(char *p) 163 { 164 static int first; 165 166 if (first++) { 167 warnx("only one -g or -p flag is permitted."); 168 usage(); 169 } 170 if (!*p) { 171 warnx("illegal process id."); 172 usage(); 173 } 174 return(atoi(p)); 175 } 176 177 static void 178 usage(void) 179 { 180 fprintf(stderr, "%s\n%s\n", 181 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t cnisuw]", 182 " ktrace [-adi] [-f trfile] [-t cnisuw] command"); 183 exit(1); 184 } 185 186 static void 187 no_ktrace(int sig __unused) 188 { 189 fprintf(stderr, 190 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n"); 191 exit(1); 192 } 193