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dump.c

/*
 * Copyright (c) 2000 Paul Herman
 * 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.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $Id: dump.c,v 1.14 2002/09/18 21:00:29 pherman Exp $
 */

/**********************************************************
 * Example of how to use the library included
 * with this program
 **********************************************************/
#include "packetdump.h"

/* GLOBALS */
char filterexpr[BUF_SIZ]      = "";
int   get_tcp_flags           = 0;
int   what_to_show            = 0;
int   packet_number           = 0;

void my_hook(packet_data *pd, void **args) {
      printf("PACKET NUMBER: %d\n", ++packet_number);
      print_packet(pd, what_to_show);
      printf("-------------------\n");
}

/*
 * process_file() takes the output of tcpdump, saves packets, and displays
 * statistics
 */
void process_file(char *fname, u_int unused) {
        get_dump_data(fname, filterexpr, get_tcp_flags,
            -1.0, my_hook, NULL);
}

int parse_show_types(char *in) {
      int ret = 0;
      while (*in) {
            if (*in == 'b' || *in == 'a' ) ret |= PP_SHOW_BASICINFO;
            if (*in == 'l' || *in == 'a' ) ret |= PP_SHOW_LINKLAYER;
            if (*in == 'i' || *in == 'a' ) ret |= PP_SHOW_IPHEADER;
            if (*in == 'c' || *in == 'a' ) ret |= PP_SHOW_PACKETCONTENT; 
            if (*in == 't' || *in == 'a' )
                  ret |=    PP_SHOW_TCPHEADER
                        | PP_SHOW_UDPHEADER
                        | PP_SHOW_ICMPHEADER;
            in++;
      }
      return ret;
}

#define USAGE                                         \
"Usage: %s [-?hls] [-f filter expr] [-r file] [-s letters]        \
\n    -?, -h            - display this help                       \
\n    -f filter expr    - filter expression to pass to tcpdump          \
\n    -l          - include link layer in packet size calc  \
\n    -r file     - file to read data from                  \
\n    -s letters  - what to show from packet, where letters is any of: \
\n          a           - everything                        \
\n          b           - basic info                        \
\n          l           - link info                   \
\n          i           - IP info                     \
\n          t           - TCP/UDP/ICMP info                 \
\n          c           - packet content              \
\n"

int Usage(int r, char *prog) {
      fprintf(stderr, USAGE, my_basename(prog)); return r;
}

void error(char *s) {
      fprintf(stderr, "error: %s\n", s);
      Usage(-1, "packetdump"); exit(-1);
}

int main(int argc, char **argv) {
      char filename[BUF_SIZ];
      int ch;

      *filename = 0;
      while ( (ch = getopt(argc, argv, "h?lf:r:s:")) != -1) {
            switch(ch) {
                  case 'h':
                  case '?':
                        return Usage(1, argv[0]);
                        break;
                  case 'l':
                        get_tcp_flags |= GET_TCPD_COUNT_LINKSIZE;
                        break;
                  case 'f':
                        strncpy(filterexpr, optarg, BUF_SIZ);
                        break;
                  case 'r':
                        strncpy(filename, optarg, BUF_SIZ);
                        break;
                  case 's':
                        what_to_show |= parse_show_types(optarg);
                        break;
                  default:
                        return Usage(1, argv[0]);
                        break;
                  }                       
            }

      if (*filename == 0) error("must specify filename");

      process_file(filename, 0);

      return 0;
}

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