742 lines
22 KiB
C
742 lines
22 KiB
C
/**-*-C-*-**********************************************************************
|
||
*
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||
* text2pcap.c
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||
*
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||
* Utility to convert an ASCII hexdump into a libpcap-format capture file
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||
*
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||
* (c) Copyright 2001 Ashok Narayanan <ashokn@cisco.com>
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*
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* $Id: text2pcap.c,v 1.1 2001/05/16 21:32:04 ashokn Exp $
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||
*
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||
* Ethereal - Network traffic analyzer
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||
* By Gerald Combs <gerald@ethereal.com>
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||
* Copyright 1998 Gerald Combs
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||
*
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||
*
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||
*
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* This program is free software; you can redistribute it and/or
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||
* modify it under the terms of the GNU General Public License
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||
* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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||
*
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* This program is distributed in the hope that it will be useful,
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||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
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||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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||
* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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||
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*******************************************************************************/
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||
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/*******************************************************************************
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*
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* This utility reads in an ASCII hexdump of this common format:
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*
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* 00000000 00 E0 1E A7 05 6F 00 10 5A A0 B9 12 08 00 46 00 .....o..Z.....F.
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* 00000010 03 68 00 00 00 00 0A 2E EE 33 0F 19 08 7F 0F 19 .h.......3.....
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||
* 00000020 03 80 94 04 00 00 10 01 16 A2 0A 00 03 50 00 0C .............P..
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||
* 00000030 01 01 0F 19 03 80 11 01 1E 61 00 0C 03 01 0F 19 .........a......
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||
*
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||
* Each bytestring line consists of an offset, one or more bytes, and
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||
* text at the end. An offset is defined as a hex string of more than
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* two characters. A byte is defined as a hex string of exactly two
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* characters. The text at the end is ignored, as is any text before
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* the offset. Bytes read from a bytestring line are added to the
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||
* current packet only if all the following conditions are satisfied:
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*
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||
* - No text appears between the offset and the bytes (any bytes appearing after
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||
* such text would be ignored)
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||
*
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* - The offset must be arithmetically correct, i.e. if the offset is 00000020, then
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* exactly 32 bytes must have been read into this packet before this. If the offset
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* is wrong, the packet is immediately terminated
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*
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||
* A packet start is signalled by a zero offset.
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*
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* Lines starting with #TEXT2PCAP are directives. These allow the user
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* to embed instructions into the capture file which allows text2pcap
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* to take some actions (e.g. specifying the encapsulation
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* etc.). Currently no directives are implemented.
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*
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* Lines beginning with # which are not directives are ignored as
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* comments. Currently all non-hexdump text is ignored by text2pcap;
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* in the future, text processing may be added, but lines prefixed
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* with '#' will still be ignored.
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*
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* The output is a libpcap packet containing Ethernet frames by
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* default. This program takes options which allow the user to add
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* dummy Ethernet, IP and UDP headers to the packets in order to allow
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* dumps of L3 or higher protocols to be decoded.
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*
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* Considerable flexibility is built into this code to read hexdumps
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* of slightly different formats. For example, any text prefixing the
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* hexdump line is dropped (including mail forwarding '>'). The offset
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* can be any hex number of four digits or greater.
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*
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* This converter cannot read a single packet greater than 64K. Packet
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* snaplength is automatically set to 64K.
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||
*/
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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 <sys/types.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <assert.h>
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#ifndef TRUE
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#define TRUE 1
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#endif
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#ifndef FALSE
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#define FALSE 0
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#endif
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#include "text2pcap.h"
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/*--- Options --------------------------------------------------------------------*/
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/* Debug level */
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int debug = 0;
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/* Be quiet */
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int quiet = FALSE;
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/* Dummy Ethernet header */
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int hdr_ethernet = FALSE;
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unsigned long hdr_ethernet_proto = 0;
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/* Dummy IP header */
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int hdr_ip = FALSE;
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unsigned long hdr_ip_proto = 0;
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/* Dummy UDP header */
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int hdr_udp = FALSE;
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unsigned long hdr_udp_dest = 0;
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unsigned long hdr_udp_src = 0;
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/*--- Local date -----------------------------------------------------------------*/
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/* This is where we store the packet currently being built */
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#define MAX_PACKET 64000
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unsigned char packet_buf[MAX_PACKET];
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unsigned long curr_offset = 0;
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/* Number of packets read and written */
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unsigned long num_packets_read = 0;
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unsigned long num_packets_written = 0;
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/* Input file */
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char *input_filename;
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FILE *input_file = NULL;
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/* Output file */
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char *output_filename;
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FILE *output_file = NULL;
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/* Offset base to parse */
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unsigned long offset_base = 16;
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FILE *yyin;
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/* ----- State machine -----------------------------------------------------------*/
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/* Current state of parser */
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typedef enum {
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INIT, /* Waiting for start of new packet */
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START_OF_LINE, /* Starting from beginning of line */
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OFFSET, /* Just read the offset */
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BYTE, /* Just read a byte */
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TEXT, /* Just read text - ignore until EOL */
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} parser_state_t;
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parser_state_t state = INIT;
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const char *state_str[] = {"Init",
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"Start-of-line",
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"Offset",
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"Byte",
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"Text"
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};
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const char *token_str[] = {"",
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"Byte",
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"Offset",
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"Directive",
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"Text",
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"End-of-line"
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};
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/* ----- Skeleton Packet Headers --------------------------------------------------*/
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typedef struct {
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unsigned char src_addr[6];
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unsigned char dest_addr[6];
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unsigned short l3pid;
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} hdr_ethernet_t;
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hdr_ethernet_t HDR_ETHERNET = {
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{0x01, 0x01, 0x01, 0x01, 0x01, 0x01},
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{0x02, 0x02, 0x02, 0x02, 0x02, 0x02},
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0};
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typedef struct {
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unsigned char ver_hdrlen;
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unsigned char dscp;
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unsigned short packet_length;
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unsigned short identification;
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unsigned char flags;
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unsigned char fragment;
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unsigned char ttl;
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unsigned char protocol;
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unsigned short hdr_checksum;
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unsigned long src_addr;
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unsigned long dest_addr;
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} hdr_ip_t;
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hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 0, 0, 0x01010101, 0x02020202};
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typedef struct {
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unsigned short source_port;
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unsigned short dest_port;
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unsigned short length;
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unsigned short checksum;
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} hdr_udp_t;
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hdr_udp_t HDR_UDP = {0, 0, 0, 0};
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char tempbuf[64];
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/*----------------------------------------------------------------------
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* Stuff for writing a PCap file
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*/
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#define PCAP_MAGIC 0xa1b2c3d4
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/* "libpcap" file header (minus magic number). */
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struct pcap_hdr {
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unsigned long magic; /* magic */
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unsigned short version_major; /* major version number */
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unsigned short version_minor; /* minor version number */
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unsigned long thiszone; /* GMT to local correction */
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unsigned long sigfigs; /* accuracy of timestamps */
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unsigned long snaplen; /* max length of captured packets, in octets */
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unsigned long network; /* data link type */
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};
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/* "libpcap" record header. */
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struct pcaprec_hdr {
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unsigned long ts_sec; /* timestamp seconds */
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unsigned long ts_usec; /* timestamp microseconds */
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unsigned long incl_len; /* number of octets of packet saved in file */
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unsigned long orig_len; /* actual length of packet */
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};
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/* Link-layer type; see net/bpf.h for details */
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unsigned long pcap_link_type = 1; /* Default is DLT-EN10MB */
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/*----------------------------------------------------------------------
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* Parse a single hex number
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* Will abort the program if it can't parse the number
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* Pass in TRUE if this is an offset, FALSE if not
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*/
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static unsigned long
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parse_num (char *str, int offset)
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{
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unsigned long num;
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char *c;
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num = strtoul(str, &c, offset ? offset_base : 16);
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if (c==str) {
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fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
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exit(-1);
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}
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return num;
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}
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/*----------------------------------------------------------------------
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* Write this byte into current packet
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*/
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static void
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write_byte (char *str)
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{
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unsigned long num;
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if (debug>=2)
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fprintf(stderr, __FUNCTION__);
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num = parse_num(str, FALSE);
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packet_buf[curr_offset] = num;
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curr_offset ++;
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}
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/*----------------------------------------------------------------------
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* Compute one's complement checksum (from RFC1071)
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*/
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static unsigned short
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in_checksum (void *buf, unsigned long count)
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{
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unsigned long sum = 0;
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unsigned short *addr = buf;
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while( count > 1 ) {
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/* This is the inner loop */
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sum += ntohs(* (unsigned short *) addr++);
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count -= 2;
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}
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/* Add left-over byte, if any */
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if( count > 0 )
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sum += * (unsigned char *) addr;
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/* Fold 32-bit sum to 16 bits */
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while (sum>>16)
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sum = (sum & 0xffff) + (sum >> 16);
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return htons(~sum);
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}
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/*----------------------------------------------------------------------
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* Write current packet out
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*/
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static void
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write_current_packet (void)
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{
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int length = 0;
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int udp_length = 0;
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int ip_length = 0;
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int eth_trailer_length = 0;
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struct pcaprec_hdr ph;
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if (curr_offset > 0) {
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/* Write the packet */
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/* Compute packet length */
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length = curr_offset;
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if (hdr_udp) { length += sizeof(HDR_UDP); udp_length = length; }
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if (hdr_ip) { length += sizeof(HDR_IP); ip_length = length; }
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if (hdr_ethernet) {
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length += sizeof(HDR_ETHERNET);
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/* Pad trailer */
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if (length < 60) {
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eth_trailer_length = 60 - length;
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length = 60;
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||
}
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||
}
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/* Write PCap header */
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ph.ts_sec = num_packets_written;
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ph.ts_usec = num_packets_written;
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ph.incl_len = length;
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ph.orig_len = length;
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fwrite(&ph, sizeof(ph), 1, output_file);
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/* Write Ethernet header */
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if (hdr_ethernet) {
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HDR_ETHERNET.l3pid = htons(hdr_ethernet_proto);
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fwrite(&HDR_ETHERNET, sizeof(HDR_ETHERNET), 1, output_file);
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}
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||
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/* Write IP header */
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||
if (hdr_ip) {
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||
HDR_IP.packet_length = htons(ip_length);
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HDR_IP.protocol = hdr_ip_proto;
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||
HDR_IP.hdr_checksum = 0;
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HDR_IP.hdr_checksum = in_checksum(&HDR_IP, sizeof(HDR_IP));
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fwrite(&HDR_IP, sizeof(HDR_IP), 1, output_file);
|
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}
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||
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||
/* Write UDP header */
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if (hdr_udp) {
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HDR_UDP.source_port = htons(hdr_udp_src);
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HDR_UDP.dest_port = htons(hdr_udp_dest);
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HDR_UDP.length = htons(udp_length);
|
||
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||
fwrite(&HDR_UDP, sizeof(HDR_UDP), 1, output_file);
|
||
}
|
||
|
||
/* Write packet */
|
||
fwrite(packet_buf, curr_offset, 1, output_file);
|
||
|
||
/* Write Ethernet trailer */
|
||
if (hdr_ethernet && eth_trailer_length > 0) {
|
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memset(tempbuf, 0, eth_trailer_length);
|
||
fwrite(tempbuf, eth_trailer_length, 1, output_file);
|
||
}
|
||
|
||
if (!quiet)
|
||
fprintf(stderr, "Wrote packet of %lu bytes\n", curr_offset);
|
||
num_packets_written ++;
|
||
}
|
||
curr_offset = 0;
|
||
}
|
||
|
||
/*----------------------------------------------------------------------
|
||
* Write the PCap file header
|
||
*/
|
||
static void
|
||
write_file_header (void)
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||
{
|
||
struct pcap_hdr fh;
|
||
|
||
if (debug>=2)
|
||
fprintf(stderr, __FUNCTION__);
|
||
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||
fh.magic = PCAP_MAGIC;
|
||
fh.version_major = 2;
|
||
fh.version_minor = 4;
|
||
fh.thiszone = 0;
|
||
fh.sigfigs = 0;
|
||
fh.snaplen = 102400;
|
||
fh.network = pcap_link_type;
|
||
|
||
fwrite(&fh, sizeof(fh), 1, output_file);
|
||
}
|
||
|
||
/*----------------------------------------------------------------------
|
||
* Start a new packet
|
||
*/
|
||
static void
|
||
start_new_packet (void)
|
||
{
|
||
if (debug>=2)
|
||
fprintf(stderr, __FUNCTION__);
|
||
|
||
if (debug>=1)
|
||
fprintf(stderr, "Start new packet\n");
|
||
|
||
/* Write out the current packet, if required */
|
||
write_current_packet();
|
||
curr_offset = 0;
|
||
num_packets_read ++;
|
||
}
|
||
|
||
/*----------------------------------------------------------------------
|
||
* Process a directive
|
||
*/
|
||
static void
|
||
process_directive (char *str)
|
||
{
|
||
if (debug>=2)
|
||
fprintf(stderr, __FUNCTION__);
|
||
|
||
fprintf(stderr, "\n--- Directive [%s] currently unsupported ---\n", str+10);
|
||
|
||
}
|
||
|
||
/*----------------------------------------------------------------------
|
||
* Parse a single token (called from the scanner)
|
||
*/
|
||
void
|
||
parse_token (token_t token, char *str)
|
||
{
|
||
unsigned long num;
|
||
|
||
/*
|
||
* This is implemented as a simple state machine of five states.
|
||
* State transitions are caused by tokens being received from the
|
||
* scanner. The code should be self_documenting.
|
||
*/
|
||
|
||
if (debug>=2) {
|
||
/* Sanitize - remove all '\r' */
|
||
char *c;
|
||
if (str!=NULL) { while ((c = strchr(str, '\r')) != NULL) *c=' '; }
|
||
|
||
fprintf(stderr, "(%s, %s \"%s\") -> (",
|
||
state_str[state], token_str[token], str ? str : "");
|
||
}
|
||
|
||
switch(state) {
|
||
|
||
/* ----- Waiting for new packet -------------------------------------------*/
|
||
case INIT:
|
||
switch(token) {
|
||
case T_DIRECTIVE:
|
||
process_directive(str);
|
||
break;
|
||
case T_OFFSET:
|
||
num = parse_num(str, TRUE);
|
||
if (num==0) {
|
||
/* New packet starts here */
|
||
start_new_packet();
|
||
state = OFFSET;
|
||
}
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
break;
|
||
|
||
/* ----- Processing packet, start of new line -----------------------------*/
|
||
case START_OF_LINE:
|
||
switch(token) {
|
||
case T_DIRECTIVE:
|
||
process_directive(str);
|
||
break;
|
||
case T_OFFSET:
|
||
num = parse_num(str, TRUE);
|
||
if (num==0) {
|
||
/* New packet starts here */
|
||
start_new_packet();
|
||
state = OFFSET;
|
||
} else if (num != curr_offset) {
|
||
/* Bad offset; switch to INIT state */
|
||
if (debug>=1)
|
||
fprintf(stderr, "Inconsistent offset. Expecting %0lX, got %0lX. Ignoring rest of packet\n",
|
||
curr_offset, num);
|
||
write_current_packet();
|
||
state = INIT;
|
||
} else
|
||
state = OFFSET;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
break;
|
||
|
||
/* ----- Processing packet, read offset -----------------------------------*/
|
||
case OFFSET:
|
||
switch(token) {
|
||
case T_BYTE:
|
||
/* Record the byte */
|
||
state = BYTE;
|
||
write_byte(str);
|
||
break;
|
||
case T_TEXT:
|
||
case T_DIRECTIVE:
|
||
case T_OFFSET:
|
||
state = TEXT;
|
||
break;
|
||
case T_EOL:
|
||
state = START_OF_LINE;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
break;
|
||
|
||
/* ----- Processing packet, read byte -------------------------------------*/
|
||
case BYTE:
|
||
switch(token) {
|
||
case T_BYTE:
|
||
/* Record the byte */
|
||
write_byte(str);
|
||
break;
|
||
case T_TEXT:
|
||
case T_DIRECTIVE:
|
||
case T_OFFSET:
|
||
state = TEXT;
|
||
break;
|
||
case T_EOL:
|
||
state = START_OF_LINE;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
break;
|
||
|
||
/* ----- Processing packet, read text -------------------------------------*/
|
||
case TEXT:
|
||
switch(token) {
|
||
case T_EOL:
|
||
state = START_OF_LINE;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
fprintf(stderr, "FATAL ERROR: Bad state (%d)", state);
|
||
exit(-1);
|
||
}
|
||
|
||
if (debug>=2)
|
||
fprintf(stderr, ", %s)\n", state_str[state]);
|
||
|
||
}
|
||
|
||
/*----------------------------------------------------------------------
|
||
* Print helpstring and exit
|
||
*/
|
||
static void
|
||
help (char *progname)
|
||
{
|
||
fprintf(stderr,
|
||
"\n"
|
||
"Usage: %s [-d] [-q] [-o h|o] [-l typenum] [-e l3pid] [-i proto] \n"
|
||
" [-u srcp destp] <input-filename> <output-filename>\n"
|
||
"\n"
|
||
"where <input-filename> specifies input filename (use - for standard input)\n"
|
||
" <output-filename> specifies output filename (use - for standard output)\n"
|
||
"\n"
|
||
"[options] are one or more of the following \n"
|
||
"\n"
|
||
" -w filename : Write capfile to <filename>. Default is standard output\n"
|
||
" -h : Display this help message \n"
|
||
" -d : Generate detailed debug of parser states \n"
|
||
" -o hex|oct : Parse offsets as (h)ex or (o)ctal. Default is hex\n"
|
||
" -l typenum : Specify link-layer type number. Default is 1 (Ethernet). \n"
|
||
" See net/bpf.h for list of numbers.\n"
|
||
" -q : Generate no output at all (automatically turns off -d)\n"
|
||
" -e l3pid : Prepend dummy Ethernet II header with specified L3PID (in HEX)\n"
|
||
" Example: -e 0x800\n"
|
||
" -i proto : Prepend dummy IP header with specified IP protocol (in DECIMAL). \n"
|
||
" Automatically prepends Ethernet header as well. Example: -i 46\n"
|
||
" -u srcp destp: Prepend dummy UDP header with specified dest and source ports (in DECIMAL).\n"
|
||
" Automatically prepends Ethernet and IP headers as well\n"
|
||
" Example: -u 30 40"
|
||
"\n",
|
||
progname);
|
||
|
||
exit(-1);
|
||
}
|
||
|
||
/*----------------------------------------------------------------------
|
||
* Parse CLI options
|
||
*/
|
||
static void
|
||
parse_options (int argc, char *argv[])
|
||
{
|
||
int c;
|
||
|
||
/* Scan CLI parameters */
|
||
while ((c = getopt(argc, argv, "dqr:w:e:i:l:o:u:")) != -1) {
|
||
switch(c) {
|
||
case '?': help(argv[0]); break;
|
||
case 'h': help(argv[0]); break;
|
||
case 'd': if (!quiet) debug++; break;
|
||
case 'q': quiet = TRUE; debug = FALSE; break;
|
||
case 'l': pcap_link_type = atoi(optarg); break;
|
||
case 'o':
|
||
if (!optarg || (optarg[0]!='h' && optarg[0] != 'o')) {
|
||
fprintf(stderr, "Bad argument for '-e': %s\n",
|
||
optarg ? optarg : "");
|
||
help(argv[0]);
|
||
}
|
||
offset_base = (optarg[0]=='o') ? 8 : 16;
|
||
break;
|
||
case 'e':
|
||
hdr_ethernet = TRUE;
|
||
if (!optarg || sscanf(optarg, "%0lx", &hdr_ethernet_proto) < 1) {
|
||
fprintf(stderr, "Bad argument for '-e': %s\n",
|
||
optarg ? optarg : "");
|
||
help(argv[0]);
|
||
}
|
||
break;
|
||
|
||
case 'i':
|
||
hdr_ip = TRUE;
|
||
if (!optarg || sscanf(optarg, "%ld", &hdr_ip_proto) < 1) {
|
||
fprintf(stderr, "Bad argument for '-i': %s\n",
|
||
optarg ? optarg : "");
|
||
help(argv[0]);
|
||
}
|
||
hdr_ethernet = TRUE;
|
||
hdr_ethernet_proto = 0x800;
|
||
break;
|
||
|
||
case 'u':
|
||
hdr_udp = TRUE;
|
||
if (!optarg || sscanf(optarg, "%ld", &hdr_udp_src) < 1) {
|
||
fprintf(stderr, "Bad src port for '-u'\n");
|
||
help(argv[0]);
|
||
}
|
||
if (optind >= argc || sscanf(argv[optind], "%ld", &hdr_udp_dest) < 1) {
|
||
fprintf(stderr, "Bad dest port for '-u'\n");
|
||
help(argv[0]);
|
||
}
|
||
hdr_ip = TRUE;
|
||
hdr_ip_proto = 17;
|
||
hdr_ethernet = TRUE;
|
||
hdr_ethernet_proto = 0x800;
|
||
break;
|
||
|
||
default:
|
||
help(argv[0]);
|
||
}
|
||
}
|
||
|
||
if (optind >= argc || argc-optind < 2) {
|
||
fprintf(stderr, "Must specify input and output filename\n");
|
||
help(argv[0]);
|
||
}
|
||
|
||
if (strcmp(argv[optind], "-")) {
|
||
input_filename = strdup(argv[optind]);
|
||
input_file = fopen(input_filename, "rb");
|
||
if (!input_file) {
|
||
fprintf(stderr, "Cannot open file [%s] for reading: %s\n",
|
||
input_filename, strerror(errno));
|
||
exit(-1);
|
||
}
|
||
} else {
|
||
input_filename = "Standard input";
|
||
input_file = stdin;
|
||
}
|
||
|
||
if (strcmp(argv[optind+1], "-")) {
|
||
output_filename = strdup(argv[optind+1]);
|
||
output_file = fopen(output_filename, "wb");
|
||
if (!output_file) {
|
||
fprintf(stderr, "Cannot open file [%s] for writing: %s\n",
|
||
output_filename, strerror(errno));
|
||
exit(-1);
|
||
}
|
||
} else {
|
||
output_filename = "Standard output";
|
||
output_file = stdout;
|
||
}
|
||
|
||
/* Some validation */
|
||
if (pcap_link_type != 1 && hdr_ethernet) {
|
||
fprintf(stderr, "Dummy headers (-e, -i, -u) cannot be specified with link type override (-l)\n");
|
||
exit(-1);
|
||
}
|
||
|
||
/* Set up our variables */
|
||
if (!input_file) {
|
||
input_file = stdin;
|
||
input_filename = "Standard input";
|
||
}
|
||
if (!output_file) {
|
||
output_file = stdout;
|
||
output_filename = "Standard output";
|
||
}
|
||
|
||
/* Display summary of our state */
|
||
if (!quiet) {
|
||
fprintf(stderr, "Input from: %s\n", input_filename);
|
||
fprintf(stderr, "Output to: %s\n", output_filename);
|
||
|
||
if (hdr_ethernet) fprintf(stderr, "Generate dummy Ethernet header: Protocol: 0x%0lX\n",
|
||
hdr_ethernet_proto);
|
||
if (hdr_ip) fprintf(stderr, "Generate dummy IP header: Protocol: %ld\n",
|
||
hdr_ip_proto);
|
||
if (hdr_udp) fprintf(stderr, "Generate dummy UDP header: Source port: %ld. Dest port: %ld\n",
|
||
hdr_udp_src, hdr_udp_dest);
|
||
}
|
||
}
|
||
|
||
int main(int argc, char *argv[])
|
||
{
|
||
parse_options(argc, argv);
|
||
|
||
assert(input_file != NULL);
|
||
assert(output_file != NULL);
|
||
|
||
write_file_header();
|
||
|
||
yyin = input_file;
|
||
yylex();
|
||
write_current_packet();
|
||
if (debug)
|
||
fprintf(stderr, "\n-------------------------\n");
|
||
if (!quiet) {
|
||
fprintf(stderr, "Read %ld potential packets, wrote %ld packets\n",
|
||
num_packets_read, num_packets_written);
|
||
}
|
||
return 0;
|
||
}
|