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