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. 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  * @(#) Copyright (c) 1988, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)ktrace.c 8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/ktrace/ktrace.c,v 1.12.2.3 2001/07/11 00:29:27 mikeh Exp $
  36  * $DragonFly: src/usr.bin/ktrace/ktrace.c,v 1.4 2005/06/01 05:05:40 swildner Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/stat.h>
  41 #include <sys/file.h>
  42 #include <sys/time.h>
  43 #include <sys/errno.h>
  44 #include <sys/uio.h>
  45 #include <sys/ktrace.h>
  46
  47 #include <err.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <unistd.h>
  51
  52 #include "ktrace.h"
  53
  54 static void     no_ktrace(int);
  55 static int      rpid(char *p);
  56 static void     usage(void);
  57
  58 int
  59 main(int argc, char **argv)
  60 {
  61         enum { NOTSET, CLEAR, CLEARALL } clear;
  62         int append, ch, fd, inherit, ops, pid, pidset, trpoints;
  63         const char *tracefile;
  64         mode_t omask;
  65         struct stat sb;
  66
  67         clear = NOTSET;
  68         append = ops = pid = pidset = inherit = 0;
  69         trpoints = DEF_POINTS;
  70         tracefile = DEF_TRACEFILE;
  71         while ((ch = getopt(argc, argv, "aCcdf:g:ip:t:")) != -1)
  72                 switch(ch) {
  73                 case 'a':
  74                         append = 1;
  75                         break;
  76                 case 'C':
  77                         clear = CLEARALL;
  78                         pidset = 1;
  79                         break;
  80                 case 'c':
  81                         clear = CLEAR;
  82                         break;
  83                 case 'd':
  84                         ops |= KTRFLAG_DESCEND;
  85                         break;
  86                 case 'f':
  87                         tracefile = optarg;
  88                         break;
  89                 case 'g':
  90                         pid = -rpid(optarg);
  91                         pidset = 1;
  92                         break;
  93                 case 'i':
  94                         inherit = 1;
  95                         break;
  96                 case 'p':
  97                         pid = rpid(optarg);
  98                         pidset = 1;
  99                         break;
 100                 case 't':
 101                         trpoints = getpoints(optarg);
 102                         if (trpoints < 0) {
 103                                 warnx("unknown facility in %s", optarg);
 104                                 usage();
 105                         }
 106                         break;
 107                 default:
 108                         usage();
 109                 }
 110         argv += optind;
 111         argc -= optind;
 112
 113         if ((pidset && *argv) || (!pidset && !*argv))
 114                 usage();
 115
 116         if (inherit)
 117                 trpoints |= KTRFAC_INHERIT;
 118
 119         signal(SIGSYS, no_ktrace);
 120         if (clear != NOTSET) {
 121                 if (clear == CLEARALL) {
 122                         ops = KTROP_CLEAR | KTRFLAG_DESCEND;
 123                         trpoints = ALL_POINTS;
 124                         pid = 1;
 125                 } else
 126                         ops |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE;
 127
 128                 if (ktrace(tracefile, ops, trpoints, pid) < 0)
 129                         err(1, "%s", tracefile);
 130                 exit(0);
 131         }
 132
 133         omask = umask(S_IRWXG|S_IRWXO);
 134         if (append) {
 135                 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0)
 136                         err(1, "%s", tracefile);
 137                 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
 138                         errx(1, "Refuse to append to %s not owned by you.",
 139                             tracefile);
 140         } else {
 141                 if (unlink(tracefile) == -1 && errno != ENOENT)
 142                         err(1, "unlink %s", tracefile);
 143                 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
 144                     DEFFILEMODE)) < 0)
 145                         err(1, "%s", tracefile);
 146         }
 147         umask(omask);
 148         close(fd);
 149
 150         if (*argv) {
 151                 if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
 152                         err(1, "%s", tracefile);
 153                 execvp(argv[0], &argv[0]);
 154                 err(1, "exec of '%s' failed", argv[0]);
 155         }
 156         else if (ktrace(tracefile, ops, trpoints, pid) < 0)
 157                 err(1, "%s", tracefile);
 158         exit(0);
 159 }
 160
 161 static int
 162 rpid(char *p)
 163 {
 164         static int first;
 165
 166         if (first++) {
 167                 warnx("only one -g or -p flag is permitted.");
 168                 usage();
 169         }
 170         if (!*p) {
 171                 warnx("illegal process id.");
 172                 usage();
 173         }
 174         return(atoi(p));
 175 }
 176
 177 static void
 178 usage(void)
 179 {
 180         fprintf(stderr, "%s\n%s\n",
 181 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t cnisuw]",
 182 "       ktrace [-adi] [-f trfile] [-t cnisuw] command");
 183         exit(1);
 184 }
 185
 186 static void
 187 no_ktrace(int sig __unused)
 188 {
 189         fprintf(stderr,
 190 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n");
 191         exit(1);
 192 }