350 lines
7.0 KiB
C
350 lines
7.0 KiB
C
/*
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* Copyright (c) 1987-1990 The Regents of the University of California.
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* 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: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: tcpdump.c,v 1.1 1993/11/14 21:21:07 deraadt Exp $
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1987-1990 The Regents of the University of California.\nAll rights reserved.\n";
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static char rcsid[] =
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"@(#) Header: tcpdump.c,v 1.68 92/06/02 17:57:41 mccanne Exp (LBL)";
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#endif
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/*
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* tcpdump - monitor tcp/ip traffic on an ethernet.
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*
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* First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
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* Mercilessly hacked and occasionally improved since then via the
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* combined efforts of Van, Steve McCanne and Craig Leres of LBL.
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*/
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#include <stdio.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/timeb.h>
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#include <netinet/in.h>
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#include <net/bpf.h>
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#include "interface.h"
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#include "savefile.h"
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#include "addrtoname.h"
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int fflag; /* don't translate "foreign" IP address */
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int nflag; /* leave addresses as numbers */
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int Nflag; /* remove domains from printed host names */
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int pflag; /* don't go promiscuous */
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int qflag; /* quick (shorter) output */
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int tflag = 1; /* print packet arrival time */
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int eflag; /* print ethernet header */
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int vflag; /* verbose */
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int xflag; /* print packet in hex */
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int Oflag = 1; /* run filter code optimizer */
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int Sflag; /* print raw TCP sequence numbers */
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int dflag; /* print filter code */
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char *program_name;
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long thiszone; /* gmt to local correction */
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static void cleanup();
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/* Length of saved portion of packet. */
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int snaplen = DEFAULT_SNAPLEN;
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static int if_fd = -1;
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struct printer {
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void (*f)();
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int type;
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};
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static struct printer printers[] = {
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{ ether_if_print, DLT_EN10MB },
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{ sl_if_print, DLT_SLIP },
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{ ppp_if_print, DLT_PPP },
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{ fddi_if_print, DLT_FDDI },
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{ null_if_print, DLT_NULL },
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{ 0, 0 },
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};
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void
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(*lookup_printer(type))()
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int type;
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{
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struct printer *p;
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for (p = printers; p->f; ++p)
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if (type == p->type)
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return p->f;
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error("unknown data link type 0x%x", type);
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/* NOTREACHED */
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}
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void
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main(argc, argv)
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int argc;
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char **argv;
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{
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struct bpf_program *parse();
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void bpf_dump();
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int cnt = -1, i;
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struct timeb zt;
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struct bpf_program *fcode;
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int op;
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void (*printit)();
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char *infile = 0;
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char *cmdbuf;
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int linktype;
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int err;
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u_long localnet;
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u_long netmask;
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char *RFileName = 0; /* -r argument */
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char *WFileName = 0; /* -w argument */
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char *device = 0;
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int precision = clock_sigfigs();
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extern char *optarg;
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extern int optind, opterr;
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program_name = argv[0];
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opterr = 0;
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while ((op = getopt(argc, argv, "c:defF:i:lnNOpqr:s:Stvw:xY")) != EOF)
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switch (op) {
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case 'c':
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cnt = atoi(optarg);
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break;
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case 'd':
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++dflag;
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break;
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case 'e':
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++eflag;
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break;
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case 'f':
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++fflag;
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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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case 'i':
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device = optarg;
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break;
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case 'l':
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setlinebuf(stdout);
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break;
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case 'n':
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++nflag;
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break;
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case 'N':
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++Nflag;
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break;
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case 'O':
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Oflag = 0;
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break;
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case 'p':
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++pflag;
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break;
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case 'q':
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++qflag;
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break;
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case 'r':
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RFileName = optarg;
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break;
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case 's':
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snaplen = atoi(optarg);
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break;
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case 'S':
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++Sflag;
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break;
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case 't':
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--tflag;
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break;
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case 'v':
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++vflag;
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break;
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case 'w':
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WFileName = optarg;
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break;
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#ifdef YYDEBUG
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case 'Y':
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{
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extern int yydebug;
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yydebug = 1;
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}
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break;
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#endif
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case 'x':
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++xflag;
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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if (tflag > 0) {
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struct timeval now;
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struct timezone tz;
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if (gettimeofday(&now, &tz) < 0) {
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perror("tcpdump: gettimeofday");
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exit(1);
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}
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thiszone = tz.tz_minuteswest * -60;
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if (localtime((time_t *)&now.tv_sec)->tm_isdst)
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thiszone += 3600;
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}
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if (RFileName) {
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/*
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* We don't need network access, so set it back to the user id.
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* Also, this prevents the user from reading anyone's
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* trace file.
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*/
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setuid(getuid());
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err = sf_read_init(RFileName, &linktype, &thiszone, &snaplen,
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&precision);
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if (err)
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sf_err(err);
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localnet = 0;
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netmask = 0;
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if (fflag != 0)
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error("-f and -r options are incompatible");
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} else {
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if (device == 0) {
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device = lookup_device();
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if (device == 0)
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error("can't find any interfaces");
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}
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if_fd = initdevice(device, pflag, &linktype);
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lookup_net(device, &localnet, &netmask);
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/*
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* Let user own process after socket has been opened.
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*/
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setuid(getuid());
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}
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if (infile)
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cmdbuf = read_infile(infile);
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else
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cmdbuf = copy_argv(&argv[optind]);
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fcode = parse(cmdbuf, Oflag, linktype, netmask);
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if (dflag) {
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bpf_dump(fcode, dflag);
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exit(0);
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}
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init_addrtoname(fflag, localnet, netmask);
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(void)signal(SIGTERM, cleanup);
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(void)signal(SIGINT, cleanup);
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(void)signal(SIGHUP, cleanup);
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printit = lookup_printer(linktype);
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if (WFileName) {
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sf_write_init(WFileName, linktype, thiszone, snaplen,
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precision);
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printit = sf_write;
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}
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if (RFileName) {
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err = sf_read(fcode, cnt, snaplen, printit);
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if (err)
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sf_err(err);
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} else {
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fprintf(stderr, "%s: listening on %s\n", program_name, device);
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fflush(stderr);
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readloop(cnt, if_fd, fcode, printit);
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}
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exit(0);
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}
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/* make a clean exit on interrupts */
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static void
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cleanup()
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{
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if (if_fd >= 0) {
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putc('\n', stderr);
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wrapup(if_fd);
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}
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exit(0);
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}
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void
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default_print(sp, length)
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register u_short *sp;
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register int length;
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{
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register u_int i;
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register int nshorts;
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nshorts = (unsigned) length / sizeof(u_short);
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i = 0;
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while (--nshorts >= 0) {
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if ((i++ % 8) == 0)
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(void)printf("\n\t\t\t");
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(void)printf(" %04x", ntohs(*sp++));
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}
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if (length & 1) {
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if ((i % 8) == 0)
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(void)printf("\n\t\t\t");
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(void)printf(" %02x", *(u_char *)sp);
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}
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}
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void
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usage()
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{
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extern char version[];
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(void)fprintf(stderr, "Version %s\n", version);
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(void)fprintf(stderr,
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"Usage: tcpdump [-deflnOpqtvx] [-c count] [-i interface]\n");
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(void)fprintf(stderr,
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"\t\t[-r filename] [-w filename] [expr]\n");
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exit(-1);
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}
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