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  */
  33
  34 #include <sys/param.h>
  35 #include <sys/stat.h>
  36 #include <sys/time.h>
  37 #include <sys/errno.h>
  38 #include <sys/ktrace.h>
  39
  40 #include <err.h>
  41 #include <fcntl.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45
  46 #include "ktrace.h"
  47
  48 static void     no_ktrace(int);
  49 static int      rpid(char *p);
  50 static void     usage(void);
  51
  52 int
  53 main(int argc, char **argv)
  54 {
  55         enum { NOTSET, CLEAR, CLEARALL } clear;
  56         int append, ch, fd, inherit, ops, pid, pidset, trpoints;
  57         const char *tracefile;
  58         mode_t omask;
  59         struct stat sb;
  60
  61         clear = NOTSET;
  62         append = ops = pid = pidset = inherit = 0;
  63         trpoints = DEF_POINTS;
  64         tracefile = DEF_TRACEFILE;
  65         while ((ch = getopt(argc, argv, "aCcdf:g:ip:t:")) != -1)
  66                 switch(ch) {
  67                 case 'a':
  68                         append = 1;
  69                         break;
  70                 case 'C':
  71                         clear = CLEARALL;
  72                         pidset = 1;
  73                         break;
  74                 case 'c':
  75                         clear = CLEAR;
  76                         break;
  77                 case 'd':
  78                         ops |= KTRFLAG_DESCEND;
  79                         break;
  80                 case 'f':
  81                         tracefile = optarg;
  82                         break;
  83                 case 'g':
  84                         pid = -rpid(optarg);
  85                         pidset = 1;
  86                         break;
  87                 case 'i':
  88                         inherit = 1;
  89                         break;
  90                 case 'p':
  91                         pid = rpid(optarg);
  92                         pidset = 1;
  93                         break;
  94                 case 't':
  95                         trpoints = getpoints(optarg);
  96                         if (trpoints < 0) {
  97                                 warnx("unknown facility in %s", optarg);
  98                                 usage();
  99                         }
 100                         break;
 101                 default:
 102                         usage();
 103                 }
 104         argv += optind;
 105         argc -= optind;
 106
 107         if ((pidset && *argv) || (!pidset && clear == NOTSET && !*argv))
 108                 usage();
 109
 110         if (inherit)
 111                 trpoints |= KTRFAC_INHERIT;
 112
 113         signal(SIGSYS, no_ktrace);
 114         if (clear != NOTSET) {
 115                 if (clear == CLEARALL) {
 116                         ops = KTROP_CLEAR | KTRFLAG_DESCEND;
 117                         trpoints = ALL_POINTS;
 118                         pid = 1;
 119                 } else
 120                         ops |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE;
 121
 122                 if (ktrace(tracefile, ops, trpoints, pid) < 0)
 123                         err(1, "%s", tracefile);
 124                 exit(0);
 125         }
 126
 127         omask = umask(S_IRWXG|S_IRWXO);
 128         if (append) {
 129                 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0)
 130                         err(1, "%s", tracefile);
 131                 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
 132                         errx(1, "Refuse to append to %s not owned by you.",
 133                             tracefile);
 134         } else {
 135                 if (unlink(tracefile) == -1 && errno != ENOENT)
 136                         err(1, "unlink %s", tracefile);
 137                 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
 138                     DEFFILEMODE)) < 0)
 139                         err(1, "%s", tracefile);
 140         }
 141         umask(omask);
 142         close(fd);
 143
 144         if (*argv) {
 145                 if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
 146                         err(1, "%s", tracefile);
 147                 execvp(argv[0], &argv[0]);
 148                 err(1, "exec of '%s' failed", argv[0]);
 149         }
 150         else if (ktrace(tracefile, ops, trpoints, pid) < 0)
 151                 err(1, "%s", tracefile);
 152         exit(0);
 153 }
 154
 155 static int
 156 rpid(char *p)
 157 {
 158         static int first;
 159
 160         if (first++) {
 161                 warnx("only one -g or -p flag is permitted.");
 162                 usage();
 163         }
 164         if (!*p) {
 165                 warnx("illegal process id.");
 166                 usage();
 167         }
 168         return(atoi(p));
 169 }
 170
 171 static void
 172 usage(void)
 173 {
 174         fprintf(stderr, "%s\n%s\n",
 175 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t cnisuw]",
 176 "       ktrace [-adi] [-f trfile] [-t cnisuw] command");
 177         exit(1);
 178 }
 179
 180 static void
 181 no_ktrace(int sig __unused)
 182 {
 183         fprintf(stderr,
 184 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n");
 185         exit(1);
 186 }