usr.bin/ktrace/ktrace.c

   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 }