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 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1988, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)ktrace.c 8.1 (Berkeley) 6/6/93"; 43 #endif 44 #endif /* not lint */ 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include <sys/param.h> 49 #include <sys/stat.h> 50 #include <sys/file.h> 51 #include <sys/time.h> 52 #include <sys/errno.h> 53 #include <sys/uio.h> 54 #include <sys/ktrace.h> 55 56 #include <err.h> 57 #include <stdlib.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <unistd.h> 61 62 #include "ktrace.h" 63 64 static char def_tracefile[] = DEF_TRACEFILE; 65 66 static void no_ktrace(int); 67 static int rpid(char *); 68 static void usage(void); 69 70 int 71 main(int argc, char *argv[]) 72 { 73 enum { NOTSET, CLEAR, CLEARALL } clear; 74 int append, ch, fd, inherit, ops, pid, pidset, trpoints; 75 const char *tracefile; 76 mode_t omask; 77 struct stat sb; 78 79 clear = NOTSET; 80 append = ops = pidset = inherit = 0; 81 trpoints = DEF_POINTS; 82 tracefile = def_tracefile; 83 while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1) 84 switch((char)ch) { 85 case 'a': 86 append = 1; 87 break; 88 case 'C': 89 clear = CLEARALL; 90 pidset = 1; 91 break; 92 case 'c': 93 clear = CLEAR; 94 break; 95 case 'd': 96 ops |= KTRFLAG_DESCEND; 97 break; 98 case 'f': 99 tracefile = optarg; 100 break; 101 case 'g': 102 pid = -rpid(optarg); 103 pidset = 1; 104 break; 105 case 'i': 106 inherit = 1; 107 break; 108 case 'p': 109 pid = rpid(optarg); 110 pidset = 1; 111 break; 112 case 't': 113 trpoints = getpoints(optarg); 114 if (trpoints < 0) { 115 warnx("unknown facility in %s", optarg); 116 usage(); 117 } 118 break; 119 default: 120 usage(); 121 } 122 argv += optind; 123 argc -= optind; 124 125 if ((pidset && *argv) || (!pidset && !*argv)) 126 usage(); 127 128 if (inherit) 129 trpoints |= KTRFAC_INHERIT; 130 131 (void)signal(SIGSYS, no_ktrace); 132 if (clear != NOTSET) { 133 if (clear == CLEARALL) { 134 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 135 trpoints = ALL_POINTS; 136 pid = 1; 137 } else 138 ops |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE; 139 140 if (ktrace(tracefile, ops, trpoints, pid) < 0) 141 err(1, "%s", tracefile); 142 exit(0); 143 } 144 145 omask = umask(S_IRWXG|S_IRWXO); 146 if (append) { 147 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0) 148 err(1, "%s", tracefile); 149 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 150 errx(1, "Refuse to append to %s not owned by you.", 151 tracefile); 152 } else { 153 if (unlink(tracefile) == -1 && errno != ENOENT) 154 err(1, "unlink %s", tracefile); 155 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 156 DEFFILEMODE)) < 0) 157 err(1, "%s", tracefile); 158 } 159 (void)umask(omask); 160 (void)close(fd); 161 162 if (*argv) { 163 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 164 err(1, "%s", tracefile); 165 execvp(argv[0], &argv[0]); 166 err(1, "exec of '%s' failed", argv[0]); 167 } 168 else if (ktrace(tracefile, ops, trpoints, pid) < 0) 169 err(1, "%s", tracefile); 170 exit(0); 171 } 172 173 static int 174 rpid(char *p) 175 { 176 static int first; 177 178 if (first++) { 179 warnx("only one -g or -p flag is permitted."); 180 usage(); 181 } 182 if (!*p) { 183 warnx("illegal process id."); 184 usage(); 185 } 186 return(atoi(p)); 187 } 188 189 static void 190 usage(void) 191 { 192 (void)fprintf(stderr, "%s\n%s\n", 193 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t cnisuw]", 194 " ktrace [-adi] [-f trfile] [-t cnisuw] command"); 195 exit(1); 196 } 197 198 static void 199 no_ktrace(int sig __unused) 200 { 201 (void)fprintf(stderr, 202 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n"); 203 exit(1); 204 } 205