source: lib/format_legacy.c @ 33d83d4

/*
 * This file is part of libtrace
 *
 * Copyright (c) 2004 The University of Waikato, Hamilton, New Zealand.
 * Authors: Daniel Lawson 
 *          Perry Lorier 
 *          
 * All rights reserved.
 *
 * This code has been developed by the University of Waikato WAND 
 * research group. For further information please see http://www.wand.net.nz/
 *
 * libtrace is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * libtrace is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with libtrace; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * $Id$
 *
 */
#define _GNU_SOURCE

#include "config.h"
#include "common.h"
#include "libtrace.h"
#include "libtrace_int.h"
#include "format_helper.h"

#include <sys/stat.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#ifdef WIN32
#  include <io.h>
#  include <share.h>
#  define snprintf sprintf_s
#endif


/* Catch undefined O_LARGEFILE on *BSD etc */
#ifndef O_LARGEFILE
#  define O_LARGEFILE 0
#endif 

#define DATA(x) ((struct legacy_format_data_t *)x->format_data)

#define INPUT DATA(libtrace)->input

struct legacy_format_data_t {
        union {
                int fd;
                libtrace_io_t *file;
        } input;
};

static int legacyeth_get_framing_length(const libtrace_packet_t *packet UNUSED) 
{
        return sizeof(legacy_ether_t);
}

static int legacypos_get_framing_length(const libtrace_packet_t *packet UNUSED) 
{
        return sizeof(legacy_pos_t);
}

static int legacyatm_get_framing_length(const libtrace_packet_t *packet UNUSED) 
{
        return sizeof(legacy_cell_t);
}

static int erf_init_input(libtrace_t *libtrace) 
{
        libtrace->format_data = malloc(sizeof(struct legacy_format_data_t));

        DATA(libtrace)->input.file = NULL;

        return 0;
}

static int erf_start_input(libtrace_t *libtrace)
{
        if (DATA(libtrace)->input.file)
                return 0;

        DATA(libtrace)->input.file = trace_open_file(libtrace);

        if (DATA(libtrace)->input.file)
                return 0;

        return -1;
}

static int erf_fin_input(libtrace_t *libtrace) {
        libtrace_io_close(INPUT.file);
        free(libtrace->format_data);
        return 0;
}

static int legacy_read_packet(libtrace_t *libtrace, libtrace_packet_t *packet) {
        int numbytes;
        void *buffer;

        if (!packet->buffer || packet->buf_control == TRACE_CTRL_EXTERNAL) {
                packet->buf_control = TRACE_CTRL_PACKET;
                packet->buffer=malloc(LIBTRACE_PACKET_BUFSIZE);
        }
        buffer = packet->buffer;

        switch(libtrace->format->type) {
                case TRACE_FORMAT_LEGACY_ATM:
                        packet->type = RT_DATA_LEGACY_ATM;
                        break;
                case TRACE_FORMAT_LEGACY_POS:
                        packet->type = RT_DATA_LEGACY_POS;
                        break;
                case TRACE_FORMAT_LEGACY_ETH:
                        packet->type = RT_DATA_LEGACY_ETH;
                        break;
                default:
                        assert(0);
        }
        
        if ((numbytes=libtrace_io_read(INPUT.file,
                                        buffer,
                                        64)) != 64) {
                if (numbytes!=0) {
                        trace_set_err(libtrace,errno,"read(%s)",libtrace->uridata);
                }
                return numbytes;
        }
        
        packet->header = packet->buffer;
        packet->payload = (void*)((char*)packet->buffer + 
                libtrace->format->get_framing_length(packet));
        
        return 64;
        
}

static libtrace_linktype_t legacypos_get_link_type(const libtrace_packet_t *packet UNUSED) {
        return TRACE_TYPE_POS;
}

static libtrace_linktype_t legacyatm_get_link_type(const libtrace_packet_t *packet UNUSED) {
        return TRACE_TYPE_ATM;
}

static libtrace_linktype_t legacyeth_get_link_type(const libtrace_packet_t *packet UNUSED) {
        return TRACE_TYPE_ETH;
}

static int legacy_get_capture_length(const libtrace_packet_t *packet UNUSED) {
        return 64;
}

static int legacypos_get_wire_length(const libtrace_packet_t *packet) {
        legacy_pos_t *lpos = (legacy_pos_t *)packet->header;
        assert(ntohl(lpos->wlen)>0);
        return ntohl(lpos->wlen);
}

static int legacyatm_get_wire_length(const libtrace_packet_t *packet UNUSED) {
        return 53;
}

static int legacyeth_get_wire_length(const libtrace_packet_t *packet) {
        legacy_ether_t *leth = (legacy_ether_t *)packet->header;
        return ntohs(leth->wlen);
}

static uint64_t legacy_get_erf_timestamp(const libtrace_packet_t *packet)
{
        legacy_ether_t *legacy = (legacy_ether_t*)packet->header;
        return legacy->ts;
}  

static void legacypos_help(void) {
        printf("legacypos format module: $Revision$\n");
        printf("Supported input URIs:\n");
        printf("\tlegacypos:/path/to/file\t(uncompressed)\n");
        printf("\tlegacypos:/path/to/file.gz\t(gzip-compressed)\n");
        printf("\tlegacypos:-\t(stdin, either compressed or not)\n");
        printf("\n");
        printf("\te.g.: legacypos:/tmp/trace.gz\n");
        printf("\n");
}

static void legacyatm_help(void) {
        printf("legacyatm format module: $Revision$\n");
        printf("Supported input URIs:\n");
        printf("\tlegacyatm:/path/to/file\t(uncompressed)\n");
        printf("\tlegacyatm:/path/to/file.gz\t(gzip-compressed)\n");
        printf("\tlegacyatm:-\t(stdin, either compressed or not)\n");
        printf("\n");
        printf("\te.g.: legacyatm:/tmp/trace.gz\n");
        printf("\n");
}

static void legacyeth_help(void) {
        printf("legacyeth format module: $Revision$\n");
        printf("Supported input URIs:\n");
        printf("\tlegacyeth:/path/to/file\t(uncompressed)\n");
        printf("\tlegacyeth:/path/to/file.gz\t(gzip-compressed)\n");
        printf("\tlegacyeth:-\t(stdin, either compressed or not)\n");
        printf("\n");
        printf("\te.g.: legacyeth:/tmp/trace.gz\n");
        printf("\n");
}

static struct libtrace_format_t legacyatm = {
        "legacyatm",
        "$Id$",
        TRACE_FORMAT_LEGACY_ATM,
        erf_init_input,                 /* init_input */        
        NULL,                           /* config_input */
        erf_start_input,                /* start_input */
        NULL,                           /* pause_input */
        NULL,                           /* init_output */
        NULL,                           /* config_output */
        NULL,                           /* start_output */
        erf_fin_input,                  /* fin_input */
        NULL,                           /* fin_output */
        legacy_read_packet,             /* read_packet */
        NULL,                           /* fin_packet */
        NULL,                           /* write_packet */
        legacyatm_get_link_type,        /* get_link_type */
        NULL,                           /* get_direction */
        NULL,                           /* set_direction */
        legacy_get_erf_timestamp,       /* get_erf_timestamp */
        NULL,                           /* get_timeval */
        NULL,                           /* get_seconds */
        NULL,                           /* seek_erf */
        NULL,                           /* seek_timeval */
        NULL,                           /* seek_seconds */
        legacy_get_capture_length,      /* get_capture_length */
        legacyatm_get_wire_length,      /* get_wire_length */
        legacyatm_get_framing_length,   /* get_framing_length */
        NULL,                           /* set_capture_length */
        NULL,                           /* get_fd */
        trace_event_trace,              /* trace_event */
        legacyatm_help,                 /* help */
        NULL                            /* next pointer */
};

static struct libtrace_format_t legacyeth = {
        "legacyeth",
        "$Id$",
        TRACE_FORMAT_LEGACY_ETH,
        erf_init_input,                 /* init_input */        
        NULL,                           /* config_input */
        erf_start_input,                /* start_input */
        NULL,                           /* pause_input */
        NULL,                           /* init_output */
        NULL,                           /* config_output */
        NULL,                           /* start_output */
        erf_fin_input,                  /* fin_input */
        NULL,                           /* fin_output */
        legacy_read_packet,             /* read_packet */
        NULL,                           /* fin_packet */
        NULL,                           /* write_packet */
        legacyeth_get_link_type,        /* get_link_type */
        NULL,                           /* get_direction */
        NULL,                           /* set_direction */
        legacy_get_erf_timestamp,       /* get_erf_timestamp */
        NULL,                           /* get_timeval */
        NULL,                           /* get_seconds */
        NULL,                           /* seek_erf */
        NULL,                           /* seek_timeval */
        NULL,                           /* seek_seconds */
        legacy_get_capture_length,      /* get_capture_length */
        legacyeth_get_wire_length,      /* get_wire_length */
        legacyeth_get_framing_length,   /* get_framing_length */
        NULL,                           /* set_capture_length */
        NULL,                           /* get_fd */
        trace_event_trace,              /* trace_event */
        legacyeth_help,                 /* help */
        NULL                            /* next pointer */
};

static struct libtrace_format_t legacypos = {
        "legacypos",
        "$Id$",
        TRACE_FORMAT_LEGACY_POS,
        erf_init_input,                 /* init_input */        
        NULL,                           /* config_input */
        erf_start_input,                /* start_input */
        NULL,                           /* pause_input */
        NULL,                           /* init_output */
        NULL,                           /* config_output */
        NULL,                           /* start_output */
        erf_fin_input,                  /* fin_input */
        NULL,                           /* fin_output */
        legacy_read_packet,             /* read_packet */
        NULL,                           /* fin_packet */
        NULL,                           /* write_packet */
        legacypos_get_link_type,        /* get_link_type */
        NULL,                           /* get_direction */
        NULL,                           /* set_direction */
        legacy_get_erf_timestamp,       /* get_erf_timestamp */
        NULL,                           /* get_timeval */
        NULL,                           /* get_seconds */
        NULL,                           /* seek_erf */
        NULL,                           /* seek_timeval */
        NULL,                           /* seek_seconds */
        legacy_get_capture_length,      /* get_capture_length */
        legacypos_get_wire_length,      /* get_wire_length */
        legacypos_get_framing_length,   /* get_framing_length */
        NULL,                           /* set_capture_length */
        NULL,                           /* get_fd */
        trace_event_trace,              /* trace_event */
        legacypos_help,                 /* help */
        NULL,                           /* next pointer */
};

        
void legacy_constructor(void) {
        register_format(&legacypos);
        register_format(&legacyeth);
        register_format(&legacyatm);
}