403 lines
8.8 KiB
C
403 lines
8.8 KiB
C
/* $NetBSD: ktrace.c,v 1.46 2013/01/24 17:47:58 christos Exp $ */
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/*-
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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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* 3. 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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1988, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)ktrace.c 8.2 (Berkeley) 4/28/95";
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#else
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__RCSID("$NetBSD: ktrace.c,v 1.46 2013/01/24 17:47:58 christos Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/file.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 <sys/socket.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include "ktrace.h"
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#ifdef KTRUSS
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#include "setemul.h"
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#endif
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static int rpid(char *);
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__dead static void usage(void);
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static int do_ktrace(const char *, int, int, int, int, int);
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__dead static void no_ktrace(int);
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static void fclear(int fd, int flag);
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#ifdef KTRUSS
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extern int timestamp, decimal, fancy, tail, maxdata;
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#endif
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int
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main(int argc, char *argv[])
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{
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enum { NOTSET, CLEAR, CLEARALL } clear;
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int block, append, ch, fd, trset, ops, pid, pidset, synclog, trpoints;
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int vers;
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const char *outfile;
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#ifdef KTRUSS
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const char *infile;
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const char *emul_name = "netbsd";
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#endif
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clear = NOTSET;
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append = ops = pidset = trset = synclog = 0;
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trpoints = 0;
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block = 1;
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vers = 2;
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pid = 0; /* Appease GCC */
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#ifdef KTRUSS
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# define OPTIONS "aCce:df:g:ilm:no:p:RTt:v:"
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outfile = infile = NULL;
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#else
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# define OPTIONS "aCcdf:g:ip:st:v:"
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outfile = DEF_TRACEFILE;
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#endif
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while ((ch = getopt(argc, argv, OPTIONS)) != -1)
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switch (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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clear = CLEARALL;
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pidset = 1;
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break;
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case 'c':
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clear = CLEAR;
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pidset = 1;
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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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#ifdef KTRUSS
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case 'e':
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emul_name = strdup(optarg); /* it's safer to copy it */
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break;
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case 'f':
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infile = optarg;
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break;
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#else
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case 'f':
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outfile = optarg;
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break;
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#endif
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case 'g':
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pid = -rpid(optarg);
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pidset = 1;
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break;
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case 'i':
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trpoints |= KTRFAC_INHERIT;
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break;
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#ifdef KTRUSS
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case 'l':
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tail = 1;
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break;
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case 'm':
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maxdata = atoi(optarg);
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break;
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case 'o':
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outfile = optarg;
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break;
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#endif
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case 'n':
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block = 0;
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break;
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case 'p':
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pid = rpid(optarg);
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pidset = 1;
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break;
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#ifdef KTRUSS
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case 'R':
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timestamp = 2; /* relative timestamp */
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break;
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#else
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case 's':
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synclog = 1;
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break;
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#endif
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#ifdef KTRUSS
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case 'T':
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timestamp = 1;
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break;
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#endif
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case 't':
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trset = 1;
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trpoints = getpoints(trpoints, 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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case 'v':
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vers = atoi(optarg);
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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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if (!trset)
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trpoints |= clear == NOTSET ? DEF_POINTS : ALL_POINTS;
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if ((pidset && *argv) || (!pidset && !*argv)) {
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#ifdef KTRUSS
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if (!infile)
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#endif
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usage();
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}
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#ifdef KTRUSS
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if (clear == CLEAR && outfile == NULL && pid == 0)
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usage();
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if (infile) {
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dumpfile(infile, 0, trpoints);
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exit(0);
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}
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setemul(emul_name, 0, 0);
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#endif
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/*
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* For cleaner traces, initialize malloc now rather
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* than in a traced subprocess.
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*/
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free(malloc(1));
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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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pid = 1;
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} else
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ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE;
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(void)do_ktrace(outfile, vers, ops, trpoints, pid, block);
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exit(0);
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}
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if (outfile && strcmp(outfile, "-")) {
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if ((fd = open(outfile, O_CREAT | O_WRONLY |
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(append ? 0 : O_TRUNC) | (synclog ? 0 : O_SYNC),
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DEFFILEMODE)) < 0)
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err(EXIT_FAILURE, "%s", outfile);
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(void)close(fd);
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}
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if (*argv) {
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#ifdef KTRUSS
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if (do_ktrace(outfile, vers, ops, trpoints, getpid(), block) == 1) {
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execvp(argv[0], &argv[0]);
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err(EXIT_FAILURE, "exec of '%s' failed", argv[0]);
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}
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#else
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(void)do_ktrace(outfile, vers, ops, trpoints, getpid(), block);
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execvp(argv[0], &argv[0]);
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err(EXIT_FAILURE, "exec of '%s' failed", argv[0]);
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#endif
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} else
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(void)do_ktrace(outfile, vers, ops, trpoints, pid, block);
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return 0;
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}
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static int
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rpid(char *p)
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{
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static int first;
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if (first++) {
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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) {
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warnx("illegal process id.");
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usage();
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}
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return (atoi(p));
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}
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static void
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fclear(int fd, int flag)
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{
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int oflag = fcntl(fd, F_GETFL, 0);
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if (oflag == -1)
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err(EXIT_FAILURE, "Cannot get file flags");
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if (fcntl(fd, F_SETFL, oflag & ~flag) == -1)
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err(EXIT_FAILURE, "Cannot set file flags");
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}
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static void
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usage(void)
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{
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#define TRPOINTS "[AaceilmnSsuvw+-]"
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#ifdef KTRUSS
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(void)fprintf(stderr, "usage:\t%s "
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"[-aCcdilnRT] [-e emulation] [-f infile] [-g pgrp] "
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"[-m maxdata]\n\t "
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"[-o outfile] [-p pid] [-t " TRPOINTS "]\n", getprogname());
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(void)fprintf(stderr, "\t%s "
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"[-adinRT] [-e emulation] [-m maxdata] [-o outfile]\n\t "
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"[-t " TRPOINTS "] [-v vers] command\n",
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getprogname());
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#else
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(void)fprintf(stderr, "usage:\t%s "
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"[-aCcdins] [-f trfile] [-g pgrp] [-p pid] [-t " TRPOINTS "]\n",
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getprogname());
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(void)fprintf(stderr, "\t%s "
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"[-adis] [-f trfile] [-t " TRPOINTS "] command\n",
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getprogname());
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#endif
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exit(1);
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}
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static const char *ktracefile = NULL;
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static void
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/*ARGSUSED*/
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no_ktrace(int sig)
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{
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if (ktracefile)
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(void)unlink(ktracefile);
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(void)errx(EXIT_FAILURE,
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"ktrace(2) system call not supported in the running"
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" kernel; re-compile kernel with `options KTRACE'");
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}
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static int
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do_ktrace(const char *tracefile, int vers, int ops, int trpoints, int pid,
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int block)
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{
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int ret;
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ops |= vers << KTRFAC_VER_SHIFT;
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if (KTROP(ops) == KTROP_SET &&
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(!tracefile || strcmp(tracefile, "-") == 0)) {
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int pi[2], dofork;
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if (pipe2(pi, O_CLOEXEC) == -1)
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err(EXIT_FAILURE, "pipe(2)");
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dofork = (pid == getpid());
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if (dofork) {
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#ifdef KTRUSS
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/*
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* Create a child process and trace it.
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*/
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pid = fork();
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if (pid == -1)
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err(EXIT_FAILURE, "fork");
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else if (pid == 0) {
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pid = getpid();
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goto trace_and_exec;
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}
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#else
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int fpid;
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/*
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* Create a dumper process and we will be
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* traced.
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*/
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fpid = fork();
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if (fpid == -1)
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err(EXIT_FAILURE, "fork");
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else if (fpid != 0)
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goto trace_and_exec;
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#endif
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(void)close(pi[1]);
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} else {
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ret = fktrace(pi[1], ops, trpoints, pid);
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if (ret == -1)
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err(EXIT_FAILURE, "fd %d, pid %d",
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pi[1], pid);
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if (block)
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fclear(pi[1], O_NONBLOCK);
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}
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#ifdef KTRUSS
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dumpfile(NULL, pi[0], trpoints);
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waitpid(pid, NULL, 0);
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#else
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{
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char buf[BUFSIZ];
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int n;
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while ((n =
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read(pi[0], buf, sizeof(buf))) > 0)
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if (write(STDOUT_FILENO, buf, (size_t)n) == -1)
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warn("write failed");
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}
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if (dofork)
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_exit(0);
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#endif
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return 0;
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trace_and_exec:
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(void)close(pi[0]);
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ret = fktrace(pi[1], ops, trpoints, pid);
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if (ret == -1)
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err(EXIT_FAILURE, "fd %d, pid %d", pi[1], pid);
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if (block)
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fclear(pi[1], O_NONBLOCK);
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} else {
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ret = ktrace(ktracefile = tracefile, ops, trpoints, pid);
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if (ret == -1)
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err(EXIT_FAILURE, "file %s, pid %d",
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tracefile != NULL ? tracefile : "NULL", pid);
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}
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return 1;
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}
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