ktrace.tproj/ktrace.c

   1 /*
   2  * Copyright (c) 1999, 2000-2001 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*-
  26  * Copyright (c) 1988, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #ifndef lint
  59 static char copyright[] =
  60 "@(#) Copyright (c) 1988, 1993\n\
  61         The Regents of the University of California.  All rights reserved.\n";
  62 #endif /* not lint */
  63
  64 #ifndef lint
  65 #if 0
  66 static char sccsid[] = "@(#)ktrace.c    8.1 (Berkeley) 6/6/93";
  67 #endif
  68 static const char rcsid[] =
  69   "$FreeBSD: src/usr.bin/ktrace/ktrace.c,v 1.12.2.3 2001/07/11 00:29:27 mikeh Exp $";
  70 #endif /* not lint */
  71
  72 #include <sys/param.h>
  73 #include <sys/stat.h>
  74 #include <sys/file.h>
  75 #include <sys/time.h>
  76 #include <sys/errno.h>
  77 #include <sys/uio.h>
  78 #include <sys/ktrace.h>
  79
  80 #include <err.h>
  81 #include <stdio.h>
  82 #include <unistd.h>
  83
  84 #include "ktrace.h"
  85
  86 void no_ktrace __P((int));
  87 void usage __P((void));
  88
  89 main(argc, argv)
  90         int argc;
  91         char **argv;
  92 {
  93         enum { NOTSET, CLEAR, CLEARALL } clear;
  94         int append, ch, fd, inherit, ops, pid, pidset, trpoints;
  95         char *tracefile;
  96         mode_t omask;
  97         struct stat sb;
  98
  99         clear = NOTSET;
 100         append = ops = pidset = inherit = 0;
 101         trpoints = DEF_POINTS;
 102         tracefile = DEF_TRACEFILE;
 103         while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1)
 104                 switch((char)ch) {
 105                 case 'a':
 106                         append = 1;
 107                         break;
 108                 case 'C':
 109                         clear = CLEARALL;
 110                         pidset = 1;
 111                         break;
 112                 case 'c':
 113                         clear = CLEAR;
 114                         break;
 115                 case 'd':
 116                         ops |= KTRFLAG_DESCEND;
 117                         break;
 118                 case 'f':
 119                         tracefile = optarg;
 120                         break;
 121                 case 'g':
 122                         pid = -rpid(optarg);
 123                         pidset = 1;
 124                         break;
 125                 case 'i':
 126                         inherit = 1;
 127                         break;
 128                 case 'p':
 129                         pid = rpid(optarg);
 130                         pidset = 1;
 131                         break;
 132                 case 't':
 133                         trpoints = getpoints(optarg);
 134                         if (trpoints < 0) {
 135                                 warnx("unknown facility in %s", optarg);
 136                                 usage();
 137                         }
 138                         break;
 139                 default:
 140                         usage();
 141                 }
 142         argv += optind;
 143         argc -= optind;
 144
 145         if (pidset && *argv || !pidset && !*argv)
 146                 usage();
 147
 148         if (inherit)
 149                 trpoints |= KTRFAC_INHERIT;
 150
 151         (void)signal(SIGSYS, no_ktrace);
 152         if (clear != NOTSET) {
 153                 if (clear == CLEARALL) {
 154                         ops = KTROP_CLEAR | KTRFLAG_DESCEND;
 155                         trpoints = ALL_POINTS;
 156                         pid = 1;
 157                 } else
 158                         ops |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE;
 159
 160                 if (ktrace(tracefile, ops, trpoints, pid) < 0)
 161                         err(1, "%s", tracefile);
 162                 exit(0);
 163         }
 164
 165         omask = umask(S_IRWXG|S_IRWXO);
 166         if (append) {
 167                 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0)
 168                         err(1, "%s", tracefile);
 169                 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
 170                         errx(1, "Refuse to append to %s not owned by you.",
 171                             tracefile);
 172         } else {
 173                 if (unlink(tracefile) == -1 && errno != ENOENT)
 174                         err(1, "unlink %s", tracefile);
 175                 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
 176                     DEFFILEMODE)) < 0)
 177                         err(1, "%s", tracefile);
 178         }
 179         (void)umask(omask);
 180         (void)close(fd);
 181
 182         if (*argv) {
 183                 if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
 184                         err(1, "%s", tracefile);
 185                 execvp(argv[0], &argv[0]);
 186                 err(1, "exec of '%s' failed", argv[0]);
 187         }
 188         else if (ktrace(tracefile, ops, trpoints, pid) < 0)
 189                 err(1, "%s", tracefile);
 190         exit(0);
 191 }
 192
 193 rpid(p)
 194         char *p;
 195 {
 196         static int first;
 197
 198         if (first++) {
 199                 warnx("only one -g or -p flag is permitted.");
 200                 usage();
 201         }
 202         if (!*p) {
 203                 warnx("illegal process id.");
 204                 usage();
 205         }
 206         return(atoi(p));
 207 }
 208
 209 void
 210 usage()
 211 {
 212         (void)fprintf(stderr, "%s\n%s\n",
 213 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t cnisuw]",
 214 "       ktrace [-adi] [-f trfile] [-t cnisuw] command");
 215         exit(1);
 216 }
 217
 218 void
 219 no_ktrace(sig)
 220         int sig;
 221 {
 222         (void)fprintf(stderr,
 223 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n");
 224         exit(1);
 225 }