Wireshark-dev: [Wireshark-dev] [PATCH] text2pcap changes to inject MTP2/MTP3 frame into pcap
From: Olivier Spiesser <spiesser_o@xxxxxxxxx>
Date: Tue, 17 Jul 2007 08:04:59 -0700 (PDT)
Hello,
I add the support for text2pcap to inject MTP2 or MTP3 directly into a pcap capture.
I modified "text2pcap.c", functions:
- parse_options: add support for "-M" switch
- usage: add -M switch usage
Regards,
Olivier Spiesser
I add the support for text2pcap to inject MTP2 or MTP3 directly into a pcap capture.
I modified "text2pcap.c", functions:
- parse_options: add support for "-M" switch
- usage: add -M switch usage
Regards,
Olivier Spiesser
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/**-*-C-*-**********************************************************************
*
* text2pcap.c
*
* Utility to convert an ASCII hexdump into a libpcap-format capture file
*
* (c) Copyright 2001 Ashok Narayanan <ashokn@xxxxxxxxx>
*
* $Id: text2pcap.c 21511 2007-04-22 21:55:39Z standel $
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@xxxxxxxxxxxxx>
* Copyright 1998 Gerald Combs
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*******************************************************************************/
/*******************************************************************************
*
* This utility reads in an ASCII hexdump of this common format:
*
* 00000000 00 E0 1E A7 05 6F 00 10 5A A0 B9 12 08 00 46 00 .....o..Z.....F.
* 00000010 03 68 00 00 00 00 0A 2E EE 33 0F 19 08 7F 0F 19 .h.......3.....
* 00000020 03 80 94 04 00 00 10 01 16 A2 0A 00 03 50 00 0C .............P..
* 00000030 01 01 0F 19 03 80 11 01 1E 61 00 0C 03 01 0F 19 .........a......
*
* Each bytestring line consists of an offset, one or more bytes, and
* text at the end. An offset is defined as a hex string of more than
* two characters. A byte is defined as a hex string of exactly two
* characters. The text at the end is ignored, as is any text before
* the offset. Bytes read from a bytestring line are added to the
* current packet only if all the following conditions are satisfied:
*
* - No text appears between the offset and the bytes (any bytes appearing after
* such text would be ignored)
*
* - The offset must be arithmetically correct, i.e. if the offset is 00000020, then
* exactly 32 bytes must have been read into this packet before this. If the offset
* is wrong, the packet is immediately terminated
*
* A packet start is signalled by a zero offset.
*
* Lines starting with #TEXT2PCAP are directives. These allow the user
* to embed instructions into the capture file which allows text2pcap
* to take some actions (e.g. specifying the encapsulation
* etc.). Currently no directives are implemented.
*
* Lines beginning with # which are not directives are ignored as
* comments. Currently all non-hexdump text is ignored by text2pcap;
* in the future, text processing may be added, but lines prefixed
* with '#' will still be ignored.
*
* The output is a libpcap packet containing Ethernet frames by
* default. This program takes options which allow the user to add
* dummy Ethernet, IP and UDP or TCP headers to the packets in order
* to allow dumps of L3 or higher protocols to be decoded.
*
* Considerable flexibility is built into this code to read hexdumps
* of slightly different formats. For example, any text prefixing the
* hexdump line is dropped (including mail forwarding '>'). The offset
* can be any hex number of four digits or greater.
*
* This converter cannot read a single packet greater than 64K. Packet
* snaplength is automatically set to 64K.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* Just make sure we include the prototype for strptime as well
* (needed for glibc 2.2) but make sure we do this only if not
* yet defined.
*/
#ifndef __USE_XOPEN
# define __USE_XOPEN
#endif
#include <time.h>
#include <glib.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <errno.h>
#include <assert.h>
#ifdef NEED_GETOPT_H
# include "getopt.h"
#endif
#ifdef NEED_STRPTIME_H
# include "strptime.h"
#endif
#include "text2pcap.h"
/*--- Options --------------------------------------------------------------------*/
/* Debug level */
static int debug = 0;
/* Be quiet */
static int quiet = FALSE;
/* Dummy Ethernet header */
static int hdr_ethernet = FALSE;
static unsigned long hdr_ethernet_proto = 0;
static int hdr_mtp3 = FALSE;
/* Dummy IP header */
static int hdr_ip = FALSE;
static long hdr_ip_proto = 0;
/* Dummy UDP header */
static int hdr_udp = FALSE;
static unsigned long hdr_dest_port = 0;
static unsigned long hdr_src_port = 0;
/* Dummy TCP header */
static int hdr_tcp = FALSE;
/* Dummy SCTP header */
static int hdr_sctp = FALSE;
static unsigned long hdr_sctp_src = 0;
static unsigned long hdr_sctp_dest = 0;
static unsigned long hdr_sctp_tag = 0;
/* Dummy DATA chunk header */
static int hdr_data_chunk = FALSE;
static unsigned char hdr_data_chunk_type = 0;
static unsigned char hdr_data_chunk_bits = 3;
static unsigned long hdr_data_chunk_tsn = 0;
static unsigned short hdr_data_chunk_sid = 0;
static unsigned short hdr_data_chunk_ssn = 0;
static unsigned long hdr_data_chunk_ppid = 0;
/*--- Local date -----------------------------------------------------------------*/
/* This is where we store the packet currently being built */
#define MAX_PACKET 64000
static unsigned char packet_buf[MAX_PACKET];
static unsigned long curr_offset = 0;
static unsigned long max_offset = MAX_PACKET;
static unsigned long packet_start = 0;
static void start_new_packet (void);
/* This buffer contains strings present before the packet offset 0 */
#define PACKET_PREAMBLE_MAX_LEN 2048
static unsigned char packet_preamble[PACKET_PREAMBLE_MAX_LEN+1];
static int packet_preamble_len = 0;
/* Number of packets read and written */
static unsigned long num_packets_read = 0;
static unsigned long num_packets_written = 0;
/* Time code of packet, derived from packet_preamble */
static gint32 ts_sec = 0;
static guint32 ts_usec = 0;
static char *ts_fmt = NULL;
/* Input file */
static const char *input_filename;
static FILE *input_file = NULL;
/* Output file */
static const char *output_filename;
static FILE *output_file = NULL;
/* Offset base to parse */
static unsigned long offset_base = 16;
extern FILE *yyin;
/* ----- State machine -----------------------------------------------------------*/
/* Current state of parser */
typedef enum {
INIT, /* Waiting for start of new packet */
START_OF_LINE, /* Starting from beginning of line */
READ_OFFSET, /* Just read the offset */
READ_BYTE, /* Just read a byte */
READ_TEXT /* Just read text - ignore until EOL */
} parser_state_t;
static parser_state_t state = INIT;
static const char *state_str[] = {"Init",
"Start-of-line",
"Offset",
"Byte",
"Text"
};
static const char *token_str[] = {"",
"Byte",
"Offset",
"Directive",
"Text",
"End-of-line"
};
/* ----- Skeleton Packet Headers --------------------------------------------------*/
typedef struct {
guint8 dest_addr[6];
guint8 src_addr[6];
guint16 l3pid;
} hdr_ethernet_t;
static hdr_ethernet_t HDR_ETHERNET = {
{0x02, 0x02, 0x02, 0x02, 0x02, 0x02},
{0x01, 0x01, 0x01, 0x01, 0x01, 0x01},
0};
typedef struct {
guint8 ver_hdrlen;
guint8 dscp;
guint16 packet_length;
guint16 identification;
guint8 flags;
guint8 fragment;
guint8 ttl;
guint8 protocol;
guint16 hdr_checksum;
guint32 src_addr;
guint32 dest_addr;
} hdr_ip_t;
static hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 0, 0, 0x01010101, 0x02020202};
static struct { /* pseudo header for checksum calculation */
guint32 src_addr;
guint32 dest_addr;
guint8 zero;
guint8 protocol;
guint16 length;
} pseudoh;
typedef struct {
guint16 source_port;
guint16 dest_port;
guint16 length;
guint16 checksum;
} hdr_udp_t;
static hdr_udp_t HDR_UDP = {0, 0, 0, 0};
typedef struct {
guint16 source_port;
guint16 dest_port;
guint32 seq_num;
guint32 ack_num;
guint8 hdr_length;
guint8 flags;
guint16 window;
guint16 checksum;
guint16 urg;
} hdr_tcp_t;
static hdr_tcp_t HDR_TCP = {0, 0, 0, 0, 0x50, 0, 0, 0, 0};
typedef struct {
guint16 src_port;
guint16 dest_port;
guint32 tag;
guint32 checksum;
} hdr_sctp_t;
static hdr_sctp_t HDR_SCTP = {0, 0, 0, 0};
typedef struct {
guint8 type;
guint8 bits;
guint16 length;
guint32 tsn;
guint16 sid;
guint16 ssn;
guint32 ppid;
} hdr_data_chunk_t;
static hdr_data_chunk_t HDR_DATA_CHUNK = {0, 0, 0, 0, 0, 0, 0};
static char tempbuf[64];
/*----------------------------------------------------------------------
* Stuff for writing a PCap file
*/
#define PCAP_MAGIC 0xa1b2c3d4
/* "libpcap" file header (minus magic number). */
struct pcap_hdr {
guint32 magic; /* magic */
guint16 version_major; /* major version number */
guint16 version_minor; /* minor version number */
guint32 thiszone; /* GMT to local correction */
guint32 sigfigs; /* accuracy of timestamps */
guint32 snaplen; /* max length of captured packets, in octets */
guint32 network; /* data link type */
};
/* "libpcap" record header. */
struct pcaprec_hdr {
gint32 ts_sec; /* timestamp seconds */
guint32 ts_usec; /* timestamp microseconds */
guint32 incl_len; /* number of octets of packet saved in file */
guint32 orig_len; /* actual length of packet */
};
/* Link-layer type; see net/bpf.h for details */
static unsigned long pcap_link_type = 1; /* Default is DLT-EN10MB */
/*----------------------------------------------------------------------
* Parse a single hex number
* Will abort the program if it can't parse the number
* Pass in TRUE if this is an offset, FALSE if not
*/
static unsigned long
parse_num (const char *str, int offset)
{
unsigned long num;
char *c;
num = strtoul(str, &c, offset ? offset_base : 16);
if (c==str) {
fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
exit(-1);
}
return num;
}
/*----------------------------------------------------------------------
* Write this byte into current packet
*/
static void
write_byte (const char *str)
{
unsigned long num;
num = parse_num(str, FALSE);
packet_buf[curr_offset] = (unsigned char) num;
curr_offset ++;
if (curr_offset >= max_offset) /* packet full */
start_new_packet();
}
/*----------------------------------------------------------------------
* Remove bytes from the current packet
*/
static void
unwrite_bytes (unsigned long nbytes)
{
curr_offset -= nbytes;
}
/*----------------------------------------------------------------------
* Compute one's complement checksum (from RFC1071)
*/
static guint16
in_checksum (void *buf, unsigned long count)
{
unsigned long sum = 0;
guint16 *addr = buf;
while( count > 1 ) {
/* This is the inner loop */
sum += g_ntohs(* (guint16 *) addr);
addr++;
count -= 2;
}
/* Add left-over byte, if any */
if( count > 0 )
sum += g_ntohs(* (guint8 *) addr);
/* Fold 32-bit sum to 16 bits */
while (sum>>16)
sum = (sum & 0xffff) + (sum >> 16);
return g_htons(~sum);
}
/* The CRC32C code is taken from draft-ietf-tsvwg-sctpcsum-01.txt.
* That code is copyrighted by D. Otis and has been modified.
*/
#define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF])
static guint32 crc_c[256] =
{
0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L,
};
static guint32
crc32c(const guint8* buf, unsigned int len, guint32 crc32_init)
{
unsigned int i;
guint32 crc32;
crc32 = crc32_init;
for (i = 0; i < len; i++)
CRC32C(crc32, buf[i]);
return ( crc32 );
}
static guint32
finalize_crc32c(guint32 crc32)
{
guint32 result;
guint8 byte0,byte1,byte2,byte3;
result = ~crc32;
byte0 = result & 0xff;
byte1 = (result>>8) & 0xff;
byte2 = (result>>16) & 0xff;
byte3 = (result>>24) & 0xff;
result = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
return ( result );
}
static unsigned long
number_of_padding_bytes (unsigned long length)
{
unsigned long remainder;
remainder = length % 4;
if (remainder == 0)
return 0;
else
return 4 - remainder;
}
/*----------------------------------------------------------------------
* Write current packet out
*/
static void
write_current_packet (void)
{
int length = 0;
int proto_length = 0;
int ip_length = 0;
int eth_trailer_length = 0;
int i, padding_length;
guint32 u;
struct pcaprec_hdr ph;
if (curr_offset > 0) {
/* Write the packet */
/* Compute packet length */
length = curr_offset;
if (hdr_data_chunk) { length += sizeof(HDR_DATA_CHUNK) + number_of_padding_bytes(curr_offset); }
if (hdr_sctp) { length += sizeof(HDR_SCTP); }
if (hdr_udp) { length += sizeof(HDR_UDP); proto_length = length; }
if (hdr_tcp) { length += sizeof(HDR_TCP); proto_length = length; }
if (hdr_ip) { length += sizeof(HDR_IP); ip_length = length; }
if (hdr_ethernet) {
length += sizeof(HDR_ETHERNET);
/* Pad trailer */
if (length < 60) {
eth_trailer_length = 60 - length;
length = 60;
}
}
/* Write PCap header */
ph.ts_sec = ts_sec;
ph.ts_usec = ts_usec;
if (ts_fmt == NULL) { ts_usec++; } /* fake packet counter */
ph.incl_len = length;
ph.orig_len = length;
fwrite(&ph, sizeof(ph), 1, output_file);
/* Write MTP3 header ****************** */
if (hdr_mtp3) {
//nothing to do
}
/* Write Ethernet header */
if (hdr_ethernet) {
HDR_ETHERNET.l3pid = g_htons(hdr_ethernet_proto);
fwrite(&HDR_ETHERNET, sizeof(HDR_ETHERNET), 1, output_file);
}
/* Write IP header */
if (hdr_ip) {
HDR_IP.packet_length = g_htons(ip_length);
HDR_IP.protocol = (guint8) hdr_ip_proto;
HDR_IP.hdr_checksum = 0;
HDR_IP.hdr_checksum = in_checksum(&HDR_IP, sizeof(HDR_IP));
fwrite(&HDR_IP, sizeof(HDR_IP), 1, output_file);
}
/* initialize pseudo header for checksum calculation */
pseudoh.src_addr = HDR_IP.src_addr;
pseudoh.dest_addr = HDR_IP.dest_addr;
pseudoh.zero = 0;
pseudoh.protocol = (guint8) hdr_ip_proto;
pseudoh.length = g_htons(proto_length);
/* Write UDP header */
if (hdr_udp) {
HDR_UDP.source_port = g_htons(hdr_src_port);
HDR_UDP.dest_port = g_htons(hdr_dest_port);
HDR_UDP.length = g_htons(proto_length);
HDR_UDP.checksum = 0;
u = g_ntohs(in_checksum(&pseudoh, sizeof(pseudoh))) +
g_ntohs(in_checksum(&HDR_UDP, sizeof(HDR_UDP))) +
g_ntohs(in_checksum(packet_buf, curr_offset));
HDR_UDP.checksum = g_htons((u & 0xffff) + (u>>16));
if (HDR_UDP.checksum == 0) /* differenciate between 'none' and 0 */
HDR_UDP.checksum = g_htons(1);
fwrite(&HDR_UDP, sizeof(HDR_UDP), 1, output_file);
}
/* Write TCP header */
if (hdr_tcp) {
HDR_TCP.source_port = g_htons(hdr_src_port);
HDR_TCP.dest_port = g_htons(hdr_dest_port);
/* HDR_TCP.seq_num already correct */
HDR_TCP.window = g_htons(0x2000);
HDR_TCP.checksum = 0;
u = g_ntohs(in_checksum(&pseudoh, sizeof(pseudoh))) +
g_ntohs(in_checksum(&HDR_TCP, sizeof(HDR_TCP))) +
g_ntohs(in_checksum(packet_buf, curr_offset));
HDR_TCP.checksum = g_htons((u & 0xffff) + (u>>16));
if (HDR_TCP.checksum == 0) /* differenciate between 'none' and 0 */
HDR_TCP.checksum = g_htons(1);
fwrite(&HDR_TCP, sizeof(HDR_TCP), 1, output_file);
}
/* Compute DATA chunk header and append padding */
if (hdr_data_chunk) {
HDR_DATA_CHUNK.type = hdr_data_chunk_type;
HDR_DATA_CHUNK.bits = hdr_data_chunk_bits;
HDR_DATA_CHUNK.length = g_htons(curr_offset + sizeof(HDR_DATA_CHUNK));
HDR_DATA_CHUNK.tsn = g_htonl(hdr_data_chunk_tsn);
HDR_DATA_CHUNK.sid = g_htons(hdr_data_chunk_sid);
HDR_DATA_CHUNK.ssn = g_htons(hdr_data_chunk_ssn);
HDR_DATA_CHUNK.ppid = g_htonl(hdr_data_chunk_ppid);
padding_length = number_of_padding_bytes(curr_offset);
for (i=0; i<padding_length; i++)
write_byte("0");
}
/* Write SCTP header */
if (hdr_sctp) {
HDR_SCTP.src_port = g_htons(hdr_sctp_src);
HDR_SCTP.dest_port = g_htons(hdr_sctp_dest);
HDR_SCTP.tag = g_htonl(hdr_sctp_tag);
HDR_SCTP.checksum = g_htonl(0);
HDR_SCTP.checksum = crc32c((guint8 *)&HDR_SCTP, sizeof(HDR_SCTP), ~0L);
if (hdr_data_chunk)
HDR_SCTP.checksum = crc32c((guint8 *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
HDR_SCTP.checksum = g_htonl(finalize_crc32c(crc32c(packet_buf, curr_offset, HDR_SCTP.checksum)));
fwrite(&HDR_SCTP, sizeof(HDR_SCTP), 1, output_file);
}
/* Write DATA chunk header */
if (hdr_data_chunk) {
fwrite(&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), 1, output_file);
}
/* Write packet */
fwrite(packet_buf, curr_offset, 1, output_file);
/* Write Ethernet trailer */
if (hdr_ethernet && eth_trailer_length > 0) {
memset(tempbuf, 0, eth_trailer_length);
fwrite(tempbuf, eth_trailer_length, 1, output_file);
}
if (!quiet)
fprintf(stderr, "Wrote packet of %lu bytes at %u\n", curr_offset, g_ntohl(HDR_TCP.seq_num));
num_packets_written ++;
}
HDR_TCP.seq_num = g_htonl(g_ntohl(HDR_TCP.seq_num) + curr_offset);
packet_start += curr_offset;
curr_offset = 0;
}
/*----------------------------------------------------------------------
* Write the PCap file header
*/
static void
write_file_header (void)
{
struct pcap_hdr fh;
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);
}
/*----------------------------------------------------------------------
* Append a token to the packet preamble.
*/
static void
append_to_preamble(char *str)
{
size_t toklen;
if (packet_preamble_len != 0) {
if (packet_preamble_len == PACKET_PREAMBLE_MAX_LEN)
return; /* no room to add more preamble */
/* Add a blank separator between the previous token and this token. */
packet_preamble[packet_preamble_len++] = ' ';
}
toklen = strlen(str);
if (toklen != 0) {
if (packet_preamble_len + toklen > PACKET_PREAMBLE_MAX_LEN)
return; /* no room to add the token to the preamble */
strcpy(&packet_preamble[packet_preamble_len], str);
packet_preamble_len += toklen;
}
}
/*----------------------------------------------------------------------
* Parse the preamble to get the timecode.
*/
static void
parse_preamble (void)
{
struct tm timecode;
char *subsecs;
char *p;
int subseclen;
int i;
/*
* If no "-t" flag was specified, don't attempt to parse a packet
* preamble to extract a time stamp.
*/
if (ts_fmt == NULL)
return;
ts_sec = 0;
ts_usec = 0;
/*
* Null-terminate the preamble.
*/
packet_preamble[packet_preamble_len] = '\0';
/* Ensure preamble has more than two chars before atempting to parse.
* This should cover line breaks etc that get counted.
*/
if ( strlen(packet_preamble) > 2 ) {
/*
* Initialize to the Epoch, just in case not all fields
* of the date and time are specified.
*/
timecode.tm_sec = 0;
timecode.tm_min = 0;
timecode.tm_hour = 0;
timecode.tm_mday = 1;
timecode.tm_mon = 0;
timecode.tm_year = 70;
timecode.tm_wday = 0;
timecode.tm_yday = 0;
timecode.tm_isdst = -1;
/* Get Time leaving subseconds */
subsecs = strptime( packet_preamble, ts_fmt, &timecode );
if (subsecs != NULL) {
/* Get the long time from the tm structure */
ts_sec = (gint32)mktime( &timecode );
} else
ts_sec = -1; /* we failed to parse it */
/* This will ensure incorrectly parsed dates get set to zero */
if ( -1 == ts_sec )
{
ts_sec = 0;
ts_usec = 0;
}
else
{
/* Parse subseconds */
ts_usec = strtol(subsecs, &p, 10);
if (subsecs == p) {
/* Error */
ts_usec = 0;
} else {
/*
* Convert that number to a number
* of microseconds; if it's N digits
* long, it's in units of 10^(-N) seconds,
* so, to convert it to units of
* 10^-6 seconds, we multiply by
* 10^(6-N).
*/
subseclen = p - subsecs;
if (subseclen > 6) {
/*
* *More* than 6 digits; 6-N is
* negative, so we divide by
* 10^(N-6).
*/
for (i = subseclen - 6; i != 0; i--)
ts_usec /= 10;
} else if (subseclen < 6) {
for (i = 6 - subseclen; i != 0; i--)
ts_usec *= 10;
}
}
}
}
/*printf("Format(%s), time(%u), subsecs(%u)\n\n", ts_fmt, ts_sec, ts_usec);*/
/* Clear Preamble */
packet_preamble_len = 0;
}
/*----------------------------------------------------------------------
* Start a new packet
*/
static void
start_new_packet (void)
{
if (debug>=1)
fprintf(stderr, "Start new packet\n");
/* Write out the current packet, if required */
write_current_packet();
num_packets_read ++;
/* Ensure we parse the packet preamble as it may contain the time */
parse_preamble();
}
/*----------------------------------------------------------------------
* Process a directive
*/
static void
process_directive (char *str)
{
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_TEXT:
append_to_preamble(str);
break;
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 = READ_OFFSET;
}
break;
default:
break;
}
break;
/* ----- Processing packet, start of new line -----------------------------*/
case START_OF_LINE:
switch(token) {
case T_TEXT:
append_to_preamble(str);
break;
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();
packet_start = 0;
state = READ_OFFSET;
} else if ((num - packet_start) != curr_offset) {
/*
* The offset we read isn't the one we expected.
* This may only mean that we mistakenly interpreted
* some text as byte values (e.g., if the text dump
* of packet data included a number with spaces around
* it). If the offset is less than what we expected,
* assume that's the problem, and throw away the putative
* extra byte values.
*/
if (num < curr_offset) {
unwrite_bytes(curr_offset - num);
state = READ_OFFSET;
} else {
/* 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 = READ_OFFSET;
break;
default:
break;
}
break;
/* ----- Processing packet, read offset -----------------------------------*/
case READ_OFFSET:
switch(token) {
case T_BYTE:
/* Record the byte */
state = READ_BYTE;
write_byte(str);
break;
case T_TEXT:
case T_DIRECTIVE:
case T_OFFSET:
state = READ_TEXT;
break;
case T_EOL:
state = START_OF_LINE;
break;
default:
break;
}
break;
/* ----- Processing packet, read byte -------------------------------------*/
case READ_BYTE:
switch(token) {
case T_BYTE:
/* Record the byte */
write_byte(str);
break;
case T_TEXT:
case T_DIRECTIVE:
case T_OFFSET:
state = READ_TEXT;
break;
case T_EOL:
state = START_OF_LINE;
break;
default:
break;
}
break;
/* ----- Processing packet, read text -------------------------------------*/
case READ_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 usage string and exit
*/
static void
usage (void)
{
fprintf(stderr,
"Text2pcap %s"
#ifdef SVNVERSION
" (" SVNVERSION ")"
#endif
"\n"
"Generate a capture file from an ASCII hexdump of packets.\n"
"See http://www.wireshark.org for more information.\n"
"\n"
"Usage: text2pcap [options] <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"
"Input:\n"
" -o hex|oct parse offsets as (h)ex or (o)ctal, default is hex\n"
" -t <timefmt> treats the text before the packet as a date/time code;\n"
" the specified argument is a format string of the sort \n"
" supported by strptime.\n"
" Example: The time \"10:15:14.5476\" has the format code\n"
" \"%%H:%%M:%%S.\"\n"
" NOTE: The subsecond component delimiter must be given\n"
" (.) but no pattern is required; the remaining number\n"
" is assumed to be fractions of a second.\n"
"\n"
"Output:\n"
" -l <typenum> link-layer type number. Default is 1 (Ethernet). \n"
" See the file net/bpf.h for list of numbers.\n"
" -m <max-packet> max packet length in output, default is %d\n"
"\n"
"Prepend dummy header:\n"
" -e <l3pid> prepend dummy Ethernet II header with specified L3PID\n"
" (in HEX)\n"
" Example: -e 0x800\n"
" -i <proto> prepend dummy IP header with specified IP protocol\n"
" (in DECIMAL). \n"
" Automatically prepends Ethernet header as well.\n"
" Example: -i 46\n"
" -u <srcp>,<destp> prepend dummy UDP header with specified\n"
" dest and source ports (in DECIMAL).\n"
" Automatically prepends Ethernet & IP headers as well\n"
" Example: -u 30,40\n"
" -T <srcp>,<destp> prepend dummy TCP header with specified \n"
" dest and source ports (in DECIMAL).\n"
" Automatically prepends Ethernet & IP headers as well\n"
" Example: -T 50,60\n"
" -s <srcp>,<dstp>,<tag> prepend dummy SCTP header with specified \n"
" dest/source ports and verification tag (in DECIMAL).\n"
" Automatically prepends Ethernet & IP headers as well\n"
" Example: -s 30,40,34\n"
" -S <srcp>,<dstp>,<ppi> prepend dummy SCTP header with specified \n"
" dest/source ports and verification tag 0. \n"
" It also prepends a dummy SCTP DATA \n"
" chunk header with payload protocol identifier ppi.\n"
" Example: -S 30,40,34\n"
"\n"
" -M <mtpv> To inject MTP frame in pcap file\n"
" MTP level: 2 or 3\n"
" Example: -M 2\n"
"\n"
"Miscellaneous:\n"
" -h display this help and exit\n"
" -d detailed debug of parser states \n"
" -q generate no output at all (automatically turns off -d)\n"
"",
VERSION, MAX_PACKET);
exit(-1);
}
/*----------------------------------------------------------------------
* Parse CLI options
*/
static void
parse_options (int argc, char *argv[])
{
int c;
int mtp_hdr_type;
char *p;
/* Scan CLI parameters */
while ((c = getopt(argc, argv, "dhqe:i:l:m:o:u:s:S:t:T:M:")) != -1) {
switch(c) {
case '?': usage(); break;
case 'h': usage(); break;
case 'd': if (!quiet) debug++; break;
case 'q': quiet = TRUE; debug = FALSE; break;
case 'l': pcap_link_type = strtol(optarg, NULL, 0); break;
case 'm': max_offset = strtol(optarg, NULL, 0); break;
case 'o':
if (optarg[0]!='h' && optarg[0] != 'o') {
fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
usage();
}
offset_base = (optarg[0]=='o') ? 8 : 16;
break;
case 'e':
hdr_ethernet = TRUE;
if (sscanf(optarg, "%lx", &hdr_ethernet_proto) < 1) {
fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
usage();
}
break;
case 'i':
hdr_ip = TRUE;
hdr_ip_proto = strtol(optarg, &p, 10);
if (p == optarg || *p != '\0' || hdr_ip_proto < 0 ||
hdr_ip_proto > 255) {
fprintf(stderr, "Bad argument for '-i': %s\n", optarg);
usage();
}
hdr_ethernet = TRUE;
hdr_ethernet_proto = 0x800;
break;
case 's':
hdr_sctp = TRUE;
hdr_sctp_src = strtol(optarg, &p, 10);
if (p == optarg || (*p != ',' && *p != '\0')) {
fprintf(stderr, "Bad src port for '-%c'\n", c);
usage();
}
if (*p == '\0') {
fprintf(stderr, "No dest port specified for '-%c'\n", c);
usage();
}
p++;
optarg = p;
hdr_sctp_dest = strtol(optarg, &p, 10);
if (p == optarg || (*p != ',' && *p != '\0')) {
fprintf(stderr, "Bad dest port for '-s'\n");
usage();
}
if (*p == '\0') {
fprintf(stderr, "No tag specified for '-%c'\n", c);
usage();
}
p++;
optarg = p;
hdr_sctp_tag = strtol(optarg, &p, 10);
if (p == optarg || *p != '\0') {
fprintf(stderr, "Bad tag for '-%c'\n", c);
usage();
}
hdr_ip = TRUE;
hdr_ip_proto = 132;
hdr_ethernet = TRUE;
hdr_ethernet_proto = 0x800;
break;
case 'S':
hdr_sctp = TRUE;
hdr_data_chunk = TRUE;
hdr_sctp_src = strtol(optarg, &p, 10);
if (p == optarg || (*p != ',' && *p != '\0')) {
fprintf(stderr, "Bad src port for '-%c'\n", c);
usage();
}
if (*p == '\0') {
fprintf(stderr, "No dest port specified for '-%c'\n", c);
usage();
}
p++;
optarg = p;
hdr_sctp_dest = strtol(optarg, &p, 10);
if (p == optarg || (*p != ',' && *p != '\0')) {
fprintf(stderr, "Bad dest port for '-s'\n");
usage();
}
if (*p == '\0') {
fprintf(stderr, "No ppi specified for '-%c'\n", c);
usage();
}
p++;
optarg = p;
hdr_data_chunk_ppid = strtoul(optarg, &p, 10);
if (p == optarg || *p != '\0') {
fprintf(stderr, "Bad ppi for '-%c'\n", c);
usage();
}
hdr_ip = TRUE;
hdr_ip_proto = 132;
hdr_ethernet = TRUE;
hdr_ethernet_proto = 0x800;
break;
case 't':
ts_fmt = optarg;
break;
case 'u':
hdr_udp = TRUE;
hdr_tcp = FALSE;
hdr_src_port = strtol(optarg, &p, 10);
if (p == optarg || (*p != ',' && *p != '\0')) {
fprintf(stderr, "Bad src port for '-u'\n");
usage();
}
if (*p == '\0') {
fprintf(stderr, "No dest port specified for '-u'\n");
usage();
}
p++;
optarg = p;
hdr_dest_port = strtol(optarg, &p, 10);
if (p == optarg || *p != '\0') {
fprintf(stderr, "Bad dest port for '-u'\n");
usage();
}
hdr_ip = TRUE;
hdr_ip_proto = 17;
hdr_ethernet = TRUE;
hdr_ethernet_proto = 0x800;
break;
case 'T':
hdr_tcp = TRUE;
hdr_udp = FALSE;
hdr_src_port = strtol(optarg, &p, 10);
if (p == optarg || (*p != ',' && *p != '\0')) {
fprintf(stderr, "Bad src port for '-T'\n");
usage();
}
if (*p == '\0') {
fprintf(stderr, "No dest port specified for '-u'\n");
usage();
}
p++;
optarg = p;
hdr_dest_port = strtol(optarg, &p, 10);
if (p == optarg || *p != '\0') {
fprintf(stderr, "Bad dest port for '-T'\n");
usage();
}
hdr_ip = TRUE;
hdr_ip_proto = 6;
hdr_ethernet = TRUE;
hdr_ethernet_proto = 0x800;
break;
case 'M':
//MTP
hdr_mtp3 = TRUE;
mtp_hdr_type = strtol(optarg, &p, 10);
if (p == optarg || *p != '\0') {
fprintf(stderr, "Bad or no MTP level for '-M': 2 or 3\n");
usage();
}
if (mtp_hdr_type == 2) {
pcap_link_type = 140; //MTP2
} else if (mtp_hdr_type == 3) {
pcap_link_type = 141; //MTP3
} else {
fprintf(stderr, "Bad MTP level for '-M': 2 or 3\n");
usage();
};
break;
default:
usage();
}
}
if (optind >= argc || argc-optind < 2) {
fprintf(stderr, "Must specify input and output filename\n");
usage();
}
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, -s, -S -T) 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";
}
ts_sec = (gint32) time(0); /* initialize to current time */
/* 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_src_port, hdr_dest_port);
if (hdr_tcp) fprintf(stderr, "Generate dummy TCP header: Source port: %ld. Dest port: %ld\n",
hdr_src_port, hdr_dest_port);
if (hdr_sctp) fprintf(stderr, "Generate dummy SCTP header: Source port: %ld. Dest port: %ld. Tag: %ld\n",
hdr_sctp_src, hdr_sctp_dest, hdr_sctp_tag);
if (hdr_data_chunk) fprintf(stderr, "Generate dummy DATA chunk header: TSN: %lu. SID: %d. SSN: %d. PPID: %lu\n",
hdr_data_chunk_tsn, hdr_data_chunk_sid, hdr_data_chunk_ssn, hdr_data_chunk_ppid);
}
}
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;
}
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