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  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*-
  25  * Copyright (c) 1988, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57 #ifndef lint
  58 static char copyright[] =
  59 "@(#) Copyright (c) 1988, 1993\n\
  60         The Regents of the University of California.  All rights reserved.\n";
  61 #endif /* not lint */
  62
  63 #ifndef lint
  64 #if 0
  65 static char sccsid[] = "@(#)ktrace.c    8.1 (Berkeley) 6/6/93";
  66 #endif
  67 static const char rcsid[] =
  68   "$FreeBSD: src/usr.bin/ktrace/ktrace.c,v 1.12.2.3 2001/07/11 00:29:27 mikeh Exp $";
  69 #endif /* not lint */
  70
  71 #include <sys/param.h>
  72 #include <sys/stat.h>
  73 #include <sys/file.h>
  74 #include <sys/time.h>
  75 #include <sys/errno.h>
  76 #include <sys/uio.h>
  77 #include <sys/ktrace.h>
  78
  79 #include <err.h>
  80 #include <stdio.h>
  81 #include <unistd.h>
  82
  83 #include "ktrace.h"
  84
  85 void no_ktrace __P((int));
  86 void usage __P((void));
  87
  88 main(argc, argv)
  89         int argc;
  90         char **argv;
  91 {
  92         enum { NOTSET, CLEAR, CLEARALL } clear;
  93         int append, ch, fd, inherit, ops, pid, pidset, trpoints;
  94         char *tracefile;
  95         mode_t omask;
  96         struct stat sb;
  97
  98         clear = NOTSET;
  99         append = ops = pidset = inherit = 0;
 100         trpoints = DEF_POINTS;
 101         tracefile = DEF_TRACEFILE;
 102         while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1)
 103                 switch((char)ch) {
 104                 case 'a':
 105                         append = 1;
 106                         break;
 107                 case 'C':
 108                         clear = CLEARALL;
 109                         pidset = 1;
 110                         break;
 111                 case 'c':
 112                         clear = CLEAR;
 113                         break;
 114                 case 'd':
 115                         ops |= KTRFLAG_DESCEND;
 116                         break;
 117                 case 'f':
 118                         tracefile = optarg;
 119                         break;
 120                 case 'g':
 121                         pid = -rpid(optarg);
 122                         pidset = 1;
 123                         break;
 124                 case 'i':
 125                         inherit = 1;
 126                         break;
 127                 case 'p':
 128                         pid = rpid(optarg);
 129                         pidset = 1;
 130                         break;
 131                 case 't':
 132                         trpoints = getpoints(optarg);
 133                         if (trpoints < 0) {
 134                                 warnx("unknown facility in %s", optarg);
 135                                 usage();
 136                         }
 137                         break;
 138                 default:
 139                         usage();
 140                 }
 141         argv += optind;
 142         argc -= optind;
 143
 144         if (pidset && *argv || !pidset && !*argv)
 145                 usage();
 146
 147         if (inherit)
 148                 trpoints |= KTRFAC_INHERIT;
 149
 150         (void)signal(SIGSYS, no_ktrace);
 151         if (clear != NOTSET) {
 152                 if (clear == CLEARALL) {
 153                         ops = KTROP_CLEAR | KTRFLAG_DESCEND;
 154                         trpoints = ALL_POINTS;
 155                         pid = 1;
 156                 } else
 157                         ops |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE;
 158
 159                 if (ktrace(tracefile, ops, trpoints, pid) < 0)
 160                         err(1, "%s", tracefile);
 161                 exit(0);
 162         }
 163
 164         omask = umask(S_IRWXG|S_IRWXO);
 165         if (append) {
 166                 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0)
 167                         err(1, "%s", tracefile);
 168                 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
 169                         errx(1, "Refuse to append to %s not owned by you.",
 170                             tracefile);
 171         } else {
 172                 if (unlink(tracefile) == -1 && errno != ENOENT)
 173                         err(1, "unlink %s", tracefile);
 174                 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
 175                     DEFFILEMODE)) < 0)
 176                         err(1, "%s", tracefile);
 177         }
 178         (void)umask(omask);
 179         (void)close(fd);
 180
 181         if (*argv) {
 182                 if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
 183                         err(1, "%s", tracefile);
 184                 execvp(argv[0], &argv[0]);
 185                 err(1, "exec of '%s' failed", argv[0]);
 186         }
 187         else if (ktrace(tracefile, ops, trpoints, pid) < 0)
 188                 err(1, "%s", tracefile);
 189         exit(0);
 190 }
 191
 192 rpid(p)
 193         char *p;
 194 {
 195         static int first;
 196
 197         if (first++) {
 198                 warnx("only one -g or -p flag is permitted.");
 199                 usage();
 200         }
 201         if (!*p) {
 202                 warnx("illegal process id.");
 203                 usage();
 204         }
 205         return(atoi(p));
 206 }
 207
 208 void
 209 usage()
 210 {
 211         (void)fprintf(stderr, "%s\n%s\n",
 212 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t cnisuw]",
 213 "       ktrace [-adi] [-f trfile] [-t cnisuw] command");
 214         exit(1);
 215 }
 216
 217 void
 218 no_ktrace(sig)
 219         int sig;
 220 {
 221         (void)fprintf(stderr,
 222 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n");
 223         exit(1);
 224 }