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 #if 0 41 #ifndef lint 42 static char sccsid[] = "@(#)ktrace.c 8.1 (Berkeley) 6/6/93"; 43 #endif /* not lint */ 44 #endif 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/param.h> 50 #include <sys/stat.h> 51 #include <sys/file.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 <stdlib.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <unistd.h> 62 63 #include "ktrace.h" 64 65 static char def_tracefile[] = DEF_TRACEFILE; 66 67 static void no_ktrace(int); 68 static int rpid(char *); 69 static void usage(void); 70 71 int 72 main(int argc, char *argv[]) 73 { 74 enum { NOTSET, CLEAR, CLEARALL } clear; 75 int append, ch, fd, inherit, ops, pid, pidset, trpoints; 76 const 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 && clear == NOTSET && !*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 |= pidset ? 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 | O_NONBLOCK, 149 DEFFILEMODE)) < 0) 150 err(1, "%s", tracefile); 151 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 152 errx(1, "refuse to append to %s not owned by you", 153 tracefile); 154 if (!(S_ISREG(sb.st_mode))) 155 errx(1, "%s not regular file", tracefile); 156 } else { 157 if (unlink(tracefile) == -1 && errno != ENOENT) 158 err(1, "unlink %s", tracefile); 159 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 160 DEFFILEMODE)) < 0) 161 err(1, "%s", tracefile); 162 } 163 (void)umask(omask); 164 (void)close(fd); 165 166 if (*argv) { 167 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 168 err(1, "%s", tracefile); 169 execvp(argv[0], &argv[0]); 170 err(1, "exec of '%s' failed", argv[0]); 171 } 172 else if (ktrace(tracefile, ops, trpoints, pid) < 0) 173 err(1, "%s", tracefile); 174 exit(0); 175 } 176 177 static int 178 rpid(char *p) 179 { 180 static int first; 181 182 if (first++) { 183 warnx("only one -g or -p flag is permitted"); 184 usage(); 185 } 186 if (!*p) { 187 warnx("illegal process id"); 188 usage(); 189 } 190 return(atoi(p)); 191 } 192 193 static void 194 usage(void) 195 { 196 (void)fprintf(stderr, "%s\n%s\n", 197 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t cnistuw]", 198 " ktrace [-adi] [-f trfile] [-t cnistuw] command"); 199 exit(1); 200 } 201 202 static void 203 no_ktrace(int sig __unused) 204 { 205 (void)fprintf(stderr, 206 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n"); 207 exit(1); 208 } 209