/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1988, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#if 0
#ifndef lint
static char sccsid[] = "@(#)ktrace.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/ktrace.h>
#include <err.h>
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "ktrace.h"
static char def_tracefile[] = DEF_TRACEFILE;
static enum clear { NOTSET, CLEAR, CLEARALL } clear = NOTSET;
static int pid;
static void no_ktrace(int);
static void set_pid_clear(const char *, enum clear);
static void usage(void) __dead2;
int
main(int argc, char *argv[])
{
int append, ch, fd, inherit, ops, trpoints;
const char *tracefile;
mode_t omask;
struct stat sb;
append = ops = inherit = 0;
trpoints = DEF_POINTS;
tracefile = def_tracefile;
while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1)
switch((char)ch) {
case 'a':
append = 1;
break;
case 'C':
set_pid_clear("1", CLEARALL);
break;
case 'c':
set_pid_clear(NULL, CLEAR);
break;
case 'd':
ops |= KTRFLAG_DESCEND;
break;
case 'f':
tracefile = optarg;
break;
case 'g':
set_pid_clear(optarg, NOTSET);
pid = -pid;
break;
case 'i':
inherit = 1;
break;
case 'p':
set_pid_clear(optarg, NOTSET);
break;
case 't':
trpoints = getpoints(optarg);
if (trpoints < 0) {
warnx("unknown facility in %s", optarg);
usage();
}
break;
default:
usage();
}
argv += optind;
argc -= optind;
/* must have either -[Cc], a pid or a command */
if (clear == NOTSET && pid == 0 && argc == 0)
usage();
/* can't have both a pid and a command */
/* (note that -C sets pid to 1) */
if (pid != 0 && argc > 0) {
usage();
}
if (inherit)
trpoints |= KTRFAC_INHERIT;
(void)signal(SIGSYS, no_ktrace);
if (clear != NOTSET) {
if (clear == CLEARALL) {
ops = KTROP_CLEAR | KTRFLAG_DESCEND;
trpoints = ALL_POINTS;
} else {
ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE;
}
if (ktrace(tracefile, ops, trpoints, pid) < 0)
err(1, "%s", tracefile);
exit(0);
}
omask = umask(S_IRWXG|S_IRWXO);
if (append) {
if ((fd = open(tracefile, O_CREAT | O_WRONLY | O_NONBLOCK,
DEFFILEMODE)) < 0)
err(1, "%s", tracefile);
if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
errx(1, "refuse to append to %s not owned by you",
tracefile);
if (!(S_ISREG(sb.st_mode)))
errx(1, "%s not regular file", tracefile);
} else {
if (unlink(tracefile) == -1 && errno != ENOENT)
err(1, "unlink %s", tracefile);
if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
DEFFILEMODE)) < 0)
err(1, "%s", tracefile);
}
(void)umask(omask);
(void)close(fd);
trpoints |= PROC_ABI_POINTS;
if (argc > 0) {
if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
err(1, "%s", tracefile);
execvp(*argv, argv);
err(1, "exec of '%s' failed", *argv);
}
if (ktrace(tracefile, ops, trpoints, pid) < 0)
err(1, "%s", tracefile);
exit(0);
}
static void
set_pid_clear(const char *p, enum clear cl)
{
intmax_t n;
char *e;
if (clear != NOTSET && cl != NOTSET) {
/* either -c and -C or either of them twice */
warnx("only one -c or -C flag is permitted");
usage();
}
if ((clear == CLEARALL && p != NULL) || (cl == CLEARALL && pid != 0)) {
/* both -C and a pid or pgid */
warnx("the -C flag may not be combined with -g or -p");
usage();
}
if (p != NULL && pid != 0) {
/* either -p and -g or either of them twice */
warnx("only one -g or -p flag is permitted");
usage();
}
if (p != NULL) {
errno = 0;
n = strtoimax(p, &e, 10);
/*
* 1) not a number, or outside the range of an intmax_t
* 2) inside the range of intmax_t but outside the range
* of an int, keeping in mind that the pid may be
* negated if it's actually a pgid.
*/
if (*e != '\0' || n < 1 || errno == ERANGE ||
n > (intmax_t)INT_MAX || n > -(intmax_t)INT_MIN) {
warnx("invalid process or group id");
usage();
}
pid = n;
}
if (cl != NOTSET)
if ((clear = cl) == CLEARALL)
pid = 1;
}
static void
usage(void)
{
fprintf(stderr, "%s\n%s\n",
"usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t trstr]",
" ktrace [-adi] [-f trfile] [-t trstr] command");
exit(1);
}
static void
no_ktrace(int sig __unused)
{
fprintf(stderr, "error:\t%s\n\t%s\n",
"ktrace() system call not supported in the running kernel",
"re-compile kernel with 'options KTRACE'");
exit(1);
}
plain