![Guy Harris](/assets/img/avatar_default.png)
- support for current SCTP checksum - fix a bug for the -S parameter - fix a bug in the displayed output for the TSN and PPI. svn path=/trunk/; revision=5169
1210 lines
38 KiB
C
1210 lines
38 KiB
C
/**-*-C-*-**********************************************************************
|
||
*
|
||
* text2pcap.c
|
||
*
|
||
* Utility to convert an ASCII hexdump into a libpcap-format capture file
|
||
*
|
||
* (c) Copyright 2001 Ashok Narayanan <ashokn@cisco.com>
|
||
*
|
||
* $Id: text2pcap.c,v 1.16 2002/04/15 21:53:55 guy Exp $
|
||
*
|
||
* Ethereal - Network traffic analyzer
|
||
* By Gerald Combs <gerald@ethereal.com>
|
||
* 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 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)
|
||
*/
|
||
#define __USE_XOPEN
|
||
|
||
#include <time.h>
|
||
|
||
#include <sys/types.h>
|
||
#ifdef HAVE_UNISTD_H
|
||
# include <unistd.h>
|
||
#endif
|
||
#ifdef HAVE_NETINET_IN_H
|
||
# include <netinet/in.h>
|
||
#endif
|
||
#ifdef HAVE_WINSOCK_H
|
||
# include <winsock.h>
|
||
#endif
|
||
#include <errno.h>
|
||
#include <assert.h>
|
||
|
||
#ifdef NEED_GETOPT_H
|
||
# include "getopt.h"
|
||
#endif
|
||
|
||
#ifdef NEED_STRPTIME_H
|
||
# include "strptime.h"
|
||
#endif
|
||
|
||
#ifndef TRUE
|
||
#define TRUE 1
|
||
#endif
|
||
|
||
#ifndef FALSE
|
||
#define FALSE 0
|
||
#endif
|
||
|
||
#include "text2pcap.h"
|
||
|
||
/*--- Options --------------------------------------------------------------------*/
|
||
|
||
/* Debug level */
|
||
int debug = 0;
|
||
/* Be quiet */
|
||
int quiet = FALSE;
|
||
|
||
/* Dummy Ethernet header */
|
||
int hdr_ethernet = FALSE;
|
||
unsigned long hdr_ethernet_proto = 0;
|
||
|
||
/* Dummy IP header */
|
||
int hdr_ip = FALSE;
|
||
unsigned long hdr_ip_proto = 0;
|
||
|
||
/* Dummy UDP header */
|
||
int hdr_udp = FALSE;
|
||
unsigned long hdr_udp_dest = 0;
|
||
unsigned long hdr_udp_src = 0;
|
||
|
||
/* Dummy SCTP header */
|
||
int hdr_sctp = FALSE;
|
||
unsigned long hdr_sctp_src = 0;
|
||
unsigned long hdr_sctp_dest = 0;
|
||
unsigned long hdr_sctp_tag = 0;
|
||
|
||
/* Dummy DATA chunk header */
|
||
int hdr_data_chunk = FALSE;
|
||
unsigned char hdr_data_chunk_type = 0;
|
||
unsigned char hdr_data_chunk_bits = 3;
|
||
unsigned long hdr_data_chunk_tsn = 0;
|
||
unsigned short hdr_data_chunk_sid = 0;
|
||
unsigned short hdr_data_chunk_ssn = 0;
|
||
unsigned long hdr_data_chunk_ppid = 0;
|
||
|
||
|
||
/*--- Local date -----------------------------------------------------------------*/
|
||
|
||
/* This is where we store the packet currently being built */
|
||
#define MAX_PACKET 64000
|
||
unsigned char packet_buf[MAX_PACKET];
|
||
unsigned long curr_offset = 0;
|
||
|
||
/* 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 */
|
||
unsigned long num_packets_read = 0;
|
||
unsigned long num_packets_written = 0;
|
||
|
||
/* Time code of packet, derived from packet_preamble */
|
||
static unsigned long ts_sec = 0;
|
||
static unsigned long ts_usec = 0;
|
||
static char *ts_fmt = NULL;
|
||
|
||
/* Input file */
|
||
char *input_filename;
|
||
FILE *input_file = NULL;
|
||
/* Output file */
|
||
char *output_filename;
|
||
FILE *output_file = NULL;
|
||
|
||
/* Offset base to parse */
|
||
unsigned long offset_base = 16;
|
||
|
||
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;
|
||
parser_state_t state = INIT;
|
||
|
||
const char *state_str[] = {"Init",
|
||
"Start-of-line",
|
||
"Offset",
|
||
"Byte",
|
||
"Text"
|
||
};
|
||
|
||
const char *token_str[] = {"",
|
||
"Byte",
|
||
"Offset",
|
||
"Directive",
|
||
"Text",
|
||
"End-of-line"
|
||
};
|
||
|
||
/* ----- Skeleton Packet Headers --------------------------------------------------*/
|
||
|
||
typedef struct {
|
||
unsigned char src_addr[6];
|
||
unsigned char dest_addr[6];
|
||
unsigned short l3pid;
|
||
} hdr_ethernet_t;
|
||
|
||
hdr_ethernet_t HDR_ETHERNET = {
|
||
{0x01, 0x01, 0x01, 0x01, 0x01, 0x01},
|
||
{0x02, 0x02, 0x02, 0x02, 0x02, 0x02},
|
||
0};
|
||
|
||
typedef struct {
|
||
unsigned char ver_hdrlen;
|
||
unsigned char dscp;
|
||
unsigned short packet_length;
|
||
unsigned short identification;
|
||
unsigned char flags;
|
||
unsigned char fragment;
|
||
unsigned char ttl;
|
||
unsigned char protocol;
|
||
unsigned short hdr_checksum;
|
||
unsigned long src_addr;
|
||
unsigned long dest_addr;
|
||
} hdr_ip_t;
|
||
|
||
hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 0, 0, 0x01010101, 0x02020202};
|
||
|
||
typedef struct {
|
||
unsigned short source_port;
|
||
unsigned short dest_port;
|
||
unsigned short length;
|
||
unsigned short checksum;
|
||
} hdr_udp_t;
|
||
|
||
hdr_udp_t HDR_UDP = {0, 0, 0, 0};
|
||
|
||
typedef struct {
|
||
unsigned short src_port;
|
||
unsigned short dest_port;
|
||
unsigned long tag;
|
||
unsigned long checksum;
|
||
} hdr_sctp_t;
|
||
|
||
hdr_sctp_t HDR_SCTP = {0, 0, 0, 0};
|
||
|
||
typedef struct {
|
||
unsigned char type;
|
||
unsigned char bits;
|
||
unsigned short length;
|
||
unsigned long tsn;
|
||
unsigned short sid;
|
||
unsigned short ssn;
|
||
unsigned long ppid;
|
||
} hdr_data_chunk_t;
|
||
|
||
hdr_data_chunk_t HDR_DATA_CHUNK = {0, 0, 0, 0, 0, 0, 0};
|
||
|
||
char tempbuf[64];
|
||
|
||
/*----------------------------------------------------------------------
|
||
* Stuff for writing a PCap file
|
||
*/
|
||
#define PCAP_MAGIC 0xa1b2c3d4
|
||
|
||
/* "libpcap" file header (minus magic number). */
|
||
struct pcap_hdr {
|
||
unsigned long magic; /* magic */
|
||
unsigned short version_major; /* major version number */
|
||
unsigned short version_minor; /* minor version number */
|
||
unsigned long thiszone; /* GMT to local correction */
|
||
unsigned long sigfigs; /* accuracy of timestamps */
|
||
unsigned long snaplen; /* max length of captured packets, in octets */
|
||
unsigned long network; /* data link type */
|
||
};
|
||
|
||
/* "libpcap" record header. */
|
||
struct pcaprec_hdr {
|
||
unsigned long ts_sec; /* timestamp seconds */
|
||
unsigned long ts_usec; /* timestamp microseconds */
|
||
unsigned long incl_len; /* number of octets of packet saved in file */
|
||
unsigned long orig_len; /* actual length of packet */
|
||
};
|
||
|
||
/* Link-layer type; see net/bpf.h for details */
|
||
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 (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 (char *str)
|
||
{
|
||
unsigned long num;
|
||
|
||
num = parse_num(str, FALSE);
|
||
packet_buf[curr_offset] = num;
|
||
curr_offset ++;
|
||
}
|
||
|
||
/*----------------------------------------------------------------------
|
||
* Remove bytes from the current packet
|
||
*/
|
||
static void
|
||
unwrite_bytes (unsigned long nbytes)
|
||
{
|
||
curr_offset -= nbytes;
|
||
}
|
||
|
||
/*----------------------------------------------------------------------
|
||
* Compute one's complement checksum (from RFC1071)
|
||
*/
|
||
static unsigned short
|
||
in_checksum (void *buf, unsigned long count)
|
||
{
|
||
unsigned long sum = 0;
|
||
unsigned short *addr = buf;
|
||
|
||
while( count > 1 ) {
|
||
/* This is the inner loop */
|
||
sum += ntohs(* (unsigned short *) addr++);
|
||
count -= 2;
|
||
}
|
||
|
||
/* Add left-over byte, if any */
|
||
if( count > 0 )
|
||
sum += * (unsigned char *) addr;
|
||
|
||
/* Fold 32-bit sum to 16 bits */
|
||
while (sum>>16)
|
||
sum = (sum & 0xffff) + (sum >> 16);
|
||
|
||
return 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 unsigned long 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 unsigned long
|
||
crc32c(const unsigned char* buf, unsigned int len, unsigned long crc32_init)
|
||
{
|
||
unsigned int i;
|
||
unsigned long crc32;
|
||
|
||
crc32 = crc32_init;
|
||
for (i = 0; i < len; i++)
|
||
CRC32C(crc32, buf[i]);
|
||
|
||
return ( crc32 );
|
||
}
|
||
|
||
static unsigned long
|
||
finalize_crc32c(unsigned long crc32)
|
||
{
|
||
unsigned long result;
|
||
unsigned char 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 udp_length = 0;
|
||
int ip_length = 0;
|
||
int eth_trailer_length = 0;
|
||
int i, padding_length;
|
||
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); udp_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;
|
||
ph.incl_len = length;
|
||
ph.orig_len = length;
|
||
fwrite(&ph, sizeof(ph), 1, output_file);
|
||
|
||
/* Write Ethernet header */
|
||
if (hdr_ethernet) {
|
||
HDR_ETHERNET.l3pid = htons(hdr_ethernet_proto);
|
||
fwrite(&HDR_ETHERNET, sizeof(HDR_ETHERNET), 1, output_file);
|
||
}
|
||
|
||
/* Write IP header */
|
||
if (hdr_ip) {
|
||
HDR_IP.packet_length = htons(ip_length);
|
||
HDR_IP.protocol = 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);
|
||
}
|
||
|
||
/* Write UDP header */
|
||
if (hdr_udp) {
|
||
HDR_UDP.source_port = htons(hdr_udp_src);
|
||
HDR_UDP.dest_port = htons(hdr_udp_dest);
|
||
HDR_UDP.length = htons(udp_length);
|
||
|
||
fwrite(&HDR_UDP, sizeof(HDR_UDP), 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 = htons(curr_offset + sizeof(HDR_DATA_CHUNK));
|
||
HDR_DATA_CHUNK.tsn = htonl(hdr_data_chunk_tsn);
|
||
HDR_DATA_CHUNK.sid = htons(hdr_data_chunk_sid);
|
||
HDR_DATA_CHUNK.ssn = htons(hdr_data_chunk_ssn);
|
||
HDR_DATA_CHUNK.ppid = 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 = htons(hdr_sctp_src);
|
||
HDR_SCTP.dest_port = htons(hdr_sctp_dest);
|
||
HDR_SCTP.tag = htonl(hdr_sctp_tag);
|
||
HDR_SCTP.checksum = htonl(0);
|
||
HDR_SCTP.checksum = crc32c((unsigned char *)&HDR_SCTP, sizeof(HDR_SCTP), ~0L);
|
||
if (hdr_data_chunk)
|
||
HDR_SCTP.checksum = crc32c((unsigned char *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
|
||
HDR_SCTP.checksum = 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\n", curr_offset);
|
||
num_packets_written ++;
|
||
}
|
||
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 = (unsigned long)mktime( &timecode );
|
||
} else
|
||
ts_sec = -1; /* we failed to parse it */
|
||
|
||
/* This will ensure incorrectly parsed dates get set to zero */
|
||
if ( -1L == (long)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();
|
||
curr_offset = 0;
|
||
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();
|
||
state = READ_OFFSET;
|
||
} else if (num != 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 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] [-s srcp,destp,tag] [-S srcp,destp,tag] [-t timefmt] <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"
|
||
" -s srcp,dstp,tag: Prepend dummy SCTP header with specified dest/source ports and\n"
|
||
" verification tag (in DECIMAL).\n"
|
||
" Automatically prepends Ethernet and IP headers as well\n"
|
||
" Example: -s 30,40,34\n"
|
||
" -S srcp,dstp,ppi: Prepend dummy SCTP header with specified dest/source ports and\n"
|
||
" verification tag 0. It also prepends a dummy SCTP DATA chunk header\n"
|
||
" with payload protocol identifier ppi.\n"
|
||
" Example: -S 30,40,34\n"
|
||
" -t timefmt : Treats the text before the packet as a date/time code; the\n"
|
||
" specified argument is a format string of the sort supported\n"
|
||
" 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 specified\n"
|
||
" (.) but no pattern is required; the remaining number\n"
|
||
" is assumed to be fractions of a second.\n"
|
||
"",
|
||
progname);
|
||
|
||
exit(-1);
|
||
}
|
||
|
||
/*----------------------------------------------------------------------
|
||
* Parse CLI options
|
||
*/
|
||
static void
|
||
parse_options (int argc, char *argv[])
|
||
{
|
||
int c;
|
||
char *p;
|
||
|
||
/* Scan CLI parameters */
|
||
while ((c = getopt(argc, argv, "dqr:w:e:i:l:o:u:s:S:t:")) != -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[0]!='h' && optarg[0] != 'o') {
|
||
fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
|
||
help(argv[0]);
|
||
}
|
||
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);
|
||
help(argv[0]);
|
||
}
|
||
break;
|
||
|
||
case 'i':
|
||
hdr_ip = TRUE;
|
||
if (sscanf(optarg, "%ld", &hdr_ip_proto) < 1) {
|
||
fprintf(stderr, "Bad argument for '-i': %s\n", optarg);
|
||
help(argv[0]);
|
||
}
|
||
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);
|
||
help(argv[0]);
|
||
}
|
||
if (*p == '\0') {
|
||
fprintf(stderr, "No dest port specified for '-%c'\n", c);
|
||
help(argv[0]);
|
||
}
|
||
p++;
|
||
optarg = p;
|
||
hdr_sctp_dest = strtol(optarg, &p, 10);
|
||
if (p == optarg || (*p != ',' && *p != '\0')) {
|
||
fprintf(stderr, "Bad dest port for '-s'\n");
|
||
help(argv[0]);
|
||
}
|
||
if (*p == '\0') {
|
||
fprintf(stderr, "No tag specified for '-%c'\n", c);
|
||
help(argv[0]);
|
||
}
|
||
p++;
|
||
optarg = p;
|
||
hdr_sctp_tag = strtol(optarg, &p, 10);
|
||
if (p == optarg || *p != '\0') {
|
||
fprintf(stderr, "Bad tag for '-%c'\n", c);
|
||
help(argv[0]);
|
||
}
|
||
|
||
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);
|
||
help(argv[0]);
|
||
}
|
||
if (*p == '\0') {
|
||
fprintf(stderr, "No dest port specified for '-%c'\n", c);
|
||
help(argv[0]);
|
||
}
|
||
p++;
|
||
optarg = p;
|
||
hdr_sctp_dest = strtol(optarg, &p, 10);
|
||
if (p == optarg || (*p != ',' && *p != '\0')) {
|
||
fprintf(stderr, "Bad dest port for '-s'\n");
|
||
help(argv[0]);
|
||
} if (*p == '\0') {
|
||
fprintf(stderr, "No ppi specified for '-%c'\n", c);
|
||
help(argv[0]);
|
||
}
|
||
p++;
|
||
optarg = p;
|
||
hdr_data_chunk_ppid = strtoul(optarg, &p, 10);
|
||
if (p == optarg || *p != '\0') {
|
||
fprintf(stderr, "Bad ppi for '-%c'\n", c);
|
||
help(argv[0]);
|
||
}
|
||
|
||
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_udp_src = strtol(optarg, &p, 10);
|
||
if (p == optarg || (*p != ',' && *p != '\0')) {
|
||
fprintf(stderr, "Bad src port for '-u'\n");
|
||
help(argv[0]);
|
||
}
|
||
if (*p == '\0') {
|
||
fprintf(stderr, "No dest port specified for '-u'\n");
|
||
help(argv[0]);
|
||
}
|
||
p++;
|
||
optarg = p;
|
||
hdr_udp_dest = strtol(optarg, &p, 10);
|
||
if (p == optarg || *p != '\0') {
|
||
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, -s, -S) 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);
|
||
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;
|
||
}
|