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 * $DragonFly: src/usr.bin/ktrace/ktrace.c,v 1.4 2005/06/01 03:05:40 swildner Exp $ 33 */ 34 35 #include <sys/param.h> 36 #include <sys/stat.h> 37 #include <sys/file.h> 38 #include <sys/time.h> 39 #include <sys/errno.h> 40 #include <sys/uio.h> 41 #include <sys/ktrace.h> 42 43 #include <err.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <unistd.h> 47 48 #include "ktrace.h" 49 50 static void no_ktrace(int); 51 static int rpid(char *p); 52 static void usage(void); 53 54 int 55 main(int argc, char **argv) 56 { 57 enum { NOTSET, CLEAR, CLEARALL } clear; 58 int append, ch, fd, inherit, ops, pid, pidset, trpoints; 59 const char *tracefile; 60 mode_t omask; 61 struct stat sb; 62 63 clear = NOTSET; 64 append = ops = pid = pidset = inherit = 0; 65 trpoints = DEF_POINTS; 66 tracefile = DEF_TRACEFILE; 67 while ((ch = getopt(argc, argv, "aCcdf:g:ip:t:")) != -1) 68 switch(ch) { 69 case 'a': 70 append = 1; 71 break; 72 case 'C': 73 clear = CLEARALL; 74 pidset = 1; 75 break; 76 case 'c': 77 clear = CLEAR; 78 break; 79 case 'd': 80 ops |= KTRFLAG_DESCEND; 81 break; 82 case 'f': 83 tracefile = optarg; 84 break; 85 case 'g': 86 pid = -rpid(optarg); 87 pidset = 1; 88 break; 89 case 'i': 90 inherit = 1; 91 break; 92 case 'p': 93 pid = rpid(optarg); 94 pidset = 1; 95 break; 96 case 't': 97 trpoints = getpoints(optarg); 98 if (trpoints < 0) { 99 warnx("unknown facility in %s", optarg); 100 usage(); 101 } 102 break; 103 default: 104 usage(); 105 } 106 argv += optind; 107 argc -= optind; 108 109 if ((pidset && *argv) || (!pidset && clear == NOTSET && !*argv)) 110 usage(); 111 112 if (inherit) 113 trpoints |= KTRFAC_INHERIT; 114 115 signal(SIGSYS, no_ktrace); 116 if (clear != NOTSET) { 117 if (clear == CLEARALL) { 118 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 119 trpoints = ALL_POINTS; 120 pid = 1; 121 } else 122 ops |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE; 123 124 if (ktrace(tracefile, ops, trpoints, pid) < 0) 125 err(1, "%s", tracefile); 126 exit(0); 127 } 128 129 omask = umask(S_IRWXG|S_IRWXO); 130 if (append) { 131 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0) 132 err(1, "%s", tracefile); 133 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 134 errx(1, "Refuse to append to %s not owned by you.", 135 tracefile); 136 } else { 137 if (unlink(tracefile) == -1 && errno != ENOENT) 138 err(1, "unlink %s", tracefile); 139 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 140 DEFFILEMODE)) < 0) 141 err(1, "%s", tracefile); 142 } 143 umask(omask); 144 close(fd); 145 146 if (*argv) { 147 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 148 err(1, "%s", tracefile); 149 execvp(argv[0], &argv[0]); 150 err(1, "exec of '%s' failed", argv[0]); 151 } 152 else if (ktrace(tracefile, ops, trpoints, pid) < 0) 153 err(1, "%s", tracefile); 154 exit(0); 155 } 156 157 static int 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 static void 174 usage(void) 175 { 176 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 static void 183 no_ktrace(int sig __unused) 184 { 185 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