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text2pcap.c
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/**-*-C-*-**********************************************************************
*
* text2pcap.c
*
* Utility to convert an ASCII hexdump into a libpcap-format capture file
*
* (c) Copyright 2001 Ashok Narayanan <[email protected]>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <[email protected]>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
*******************************************************************************/
/*******************************************************************************
*
* 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 signaled 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, TCP or SCTP 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
* WTAP_MAX_PACKET_SIZE_STANDARD. The snapshot length is automatically
* set to WTAP_MAX_PACKET_SIZE_STANDARD.
*/
#include <config.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
#ifndef _XOPEN_SOURCE
# ifndef __sun
# define _XOPEN_SOURCE 600
# endif
#endif
/*
* Defining _XOPEN_SOURCE is needed on some platforms, e.g. platforms
* using glibc, to expand the set of things system header files define.
*
* Unfortunately, on other platforms, such as some versions of Solaris
* (including Solaris 10), it *reduces* that set as well, causing
* strptime() not to be declared, presumably because the version of the
* X/Open spec that _XOPEN_SOURCE implies doesn't include strptime() and
* blah blah blah namespace pollution blah blah blah.
*
* So we define __EXTENSIONS__ so that "strptime()" is declared.
*/
#ifndef __EXTENSIONS__
# define __EXTENSIONS__
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wsutil/file_util.h>
#include <cli_main.h>
#include <ui/version_info.h>
#include <wsutil/inet_addr.h>
#include <wsutil/wslog.h>
#ifdef _WIN32
#include <io.h> /* for _setmode */
#include <fcntl.h> /* for O_BINARY */
#endif
#include <time.h>
#include <glib.h>
#include <wsutil/ws_getopt.h>
#include <errno.h>
#include <assert.h>
#ifndef HAVE_STRPTIME
# include "wsutil/strptime.h"
#endif
#include "writecap/pcapio.h"
#include "text2pcap.h"
#include "wiretap/wtap.h"
/*--- Options --------------------------------------------------------------------*/
/* File format */
static gboolean use_pcapng = FALSE;
/* Interface name */
static char *interface_name = NULL;
/* Debug level */
static int debug = 0;
/* Be quiet */
static gboolean quiet = FALSE;
/* Dummy Ethernet header */
static gboolean hdr_ethernet = FALSE;
static guint8 hdr_eth_dest_addr[6] = {0x0a, 0x02, 0x02, 0x02, 0x02, 0x02};
static guint8 hdr_eth_src_addr[6] = {0x0a, 0x02, 0x02, 0x02, 0x02, 0x01};
static guint32 hdr_ethernet_proto = 0;
/* Dummy IP header */
static gboolean hdr_ip = FALSE;
static gboolean hdr_ipv6 = FALSE;
static long hdr_ip_proto = -1;
/* Destination and source addresses for IP header */
static guint32 hdr_ip_dest_addr = 0;
static guint32 hdr_ip_src_addr = 0;
static ws_in6_addr hdr_ipv6_dest_addr = {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}};
static ws_in6_addr hdr_ipv6_src_addr = {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}};
static ws_in6_addr NO_IPv6_ADDRESS = {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}};
/* Dummy UDP header */
static gboolean hdr_udp = FALSE;
static guint32 hdr_dest_port = 0;
static guint32 hdr_src_port = 0;
/* Dummy TCP header */
static gboolean hdr_tcp = FALSE;
/* TCP sequence numbers when has_direction is true */
static guint32 tcp_in_seq_num = 0;
static guint32 tcp_out_seq_num = 0;
/* Dummy SCTP header */
static gboolean hdr_sctp = FALSE;
static guint32 hdr_sctp_src = 0;
static guint32 hdr_sctp_dest = 0;
static guint32 hdr_sctp_tag = 0;
/* Dummy DATA chunk header */
static gboolean hdr_data_chunk = FALSE;
static guint8 hdr_data_chunk_type = 0;
static guint8 hdr_data_chunk_bits = 0;
static guint32 hdr_data_chunk_tsn = 0;
static guint16 hdr_data_chunk_sid = 0;
static guint16 hdr_data_chunk_ssn = 0;
static guint32 hdr_data_chunk_ppid = 0;
/* ASCII text dump identification */
static gboolean identify_ascii = FALSE;
static gboolean has_direction = FALSE;
static guint32 direction = PACK_FLAGS_DIRECTION_UNKNOWN;
/*--- Local data -----------------------------------------------------------------*/
/* This is where we store the packet currently being built */
static guint8 packet_buf[WTAP_MAX_PACKET_SIZE_STANDARD];
static guint32 header_length;
static guint32 ip_offset;
static guint32 curr_offset = 0;
static guint32 max_offset = WTAP_MAX_PACKET_SIZE_STANDARD;
static guint32 packet_start = 0;
static int start_new_packet(gboolean);
/* This buffer contains strings present before the packet offset 0 */
#define PACKET_PREAMBLE_MAX_LEN 2048
static guint8 packet_preamble[PACKET_PREAMBLE_MAX_LEN+1];
static int packet_preamble_len = 0;
/* Number of packets read and written */
static guint32 num_packets_read = 0;
static guint32 num_packets_written = 0;
static guint64 bytes_written = 0;
/* Time code of packet, derived from packet_preamble */
static time_t ts_sec = 0;
static guint32 ts_nsec = 0;
static char *ts_fmt = NULL;
static struct tm timecode_default;
static guint8* pkt_lnstart;
/* Input file */
static char *input_filename;
static FILE *input_file = NULL;
/* Output file */
static char *output_filename;
static FILE *output_file = NULL;
/* Offset base to parse */
static guint32 offset_base = 16;
extern FILE *text2pcap_in;
/* ----- 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;
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;
/* Fixed IP address values */
#if G_BYTE_ORDER == G_BIG_ENDIAN
#define IP_ID 0x1234
#define IP_SRC 0x0a010101
#define IP_DST 0x0a020202
#else
#define IP_ID 0x3412
#define IP_SRC 0x0101010a
#define IP_DST 0x0202020a
#endif
static hdr_ip_t HDR_IP = {0x45, 0, 0, IP_ID, 0, 0, 0xff, 0, 0, IP_SRC, IP_DST};
static struct { /* pseudo header for checksum calculation */
guint32 src_addr;
guint32 dest_addr;
guint8 zero;
guint8 protocol;
guint16 length;
} pseudoh;
/* headers taken from glibc */
typedef struct {
union {
struct ip6_hdrctl {
guint32 ip6_un1_flow; /* 24 bits of flow-ID */
guint16 ip6_un1_plen; /* payload length */
guint8 ip6_un1_nxt; /* next header */
guint8 ip6_un1_hlim; /* hop limit */
} ip6_un1;
guint8 ip6_un2_vfc; /* 4 bits version, 4 bits priority */
} ip6_ctlun;
ws_in6_addr ip6_src; /* source address */
ws_in6_addr ip6_dst; /* destination address */
} hdr_ipv6_t;
static hdr_ipv6_t HDR_IPv6;
/* https://tools.ietf.org/html/rfc2460#section-8.1 */
static struct { /* pseudo header ipv6 for checksum calculation */
struct e_in6_addr src_addr6;
struct e_in6_addr dst_addr6;
guint32 length;
guint8 zero[3];
guint8 next_header;
} pseudoh6;
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
*/
/* Link-layer type; see https://www.tcpdump.org/linktypes.html for details */
static guint32 pcap_link_type = 1; /* Default is LINKTYPE_ETHERNET */
/*----------------------------------------------------------------------
* 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 int
parse_num(const char *str, int offset, guint32* num)
{
char *c;
if (str == NULL) {
fprintf(stderr, "FATAL ERROR: str is NULL\n");
return EXIT_FAILURE;
}
*num = (guint32)strtoul(str, &c, offset ? offset_base : 16);
if (c == str) {
fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
/*----------------------------------------------------------------------
* Write this byte into current packet
*/
static int
write_byte(const char *str)
{
guint32 num;
if (parse_num(str, FALSE, &num) != EXIT_SUCCESS)
return EXIT_FAILURE;
packet_buf[curr_offset] = (guint8) num;
curr_offset++;
if (curr_offset - header_length >= max_offset) /* packet full */
if (start_new_packet(TRUE) != EXIT_SUCCESS)
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
/*----------------------------------------------------------------------
* Write a number of bytes into current packet
*/
static void
write_bytes (const char bytes[], guint32 nbytes)
{
if (curr_offset + nbytes < WTAP_MAX_PACKET_SIZE_STANDARD) {
memcpy(&packet_buf[curr_offset], bytes, nbytes);
curr_offset += nbytes;
}
}
/*----------------------------------------------------------------------
* Remove bytes from the current packet
*/
static void
unwrite_bytes (guint32 nbytes)
{
curr_offset -= nbytes;
}
/*----------------------------------------------------------------------
* Determine SCTP chunk padding length
*/
static guint32
number_of_padding_bytes (guint32 length)
{
guint32 remainder;
remainder = length % 4;
if (remainder == 0)
return 0;
else
return 4 - remainder;
}
/*----------------------------------------------------------------------
* Compute one's complement checksum (from RFC1071)
*/
static guint16
in_checksum (void *buf, guint32 count)
{
guint32 sum = 0;
guint16 *addr = (guint16 *)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);
sum = ~sum;
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] =
{
0x00000000U, 0xF26B8303U, 0xE13B70F7U, 0x1350F3F4U,
0xC79A971FU, 0x35F1141CU, 0x26A1E7E8U, 0xD4CA64EBU,
0x8AD958CFU, 0x78B2DBCCU, 0x6BE22838U, 0x9989AB3BU,
0x4D43CFD0U, 0xBF284CD3U, 0xAC78BF27U, 0x5E133C24U,
0x105EC76FU, 0xE235446CU, 0xF165B798U, 0x030E349BU,
0xD7C45070U, 0x25AFD373U, 0x36FF2087U, 0xC494A384U,
0x9A879FA0U, 0x68EC1CA3U, 0x7BBCEF57U, 0x89D76C54U,
0x5D1D08BFU, 0xAF768BBCU, 0xBC267848U, 0x4E4DFB4BU,
0x20BD8EDEU, 0xD2D60DDDU, 0xC186FE29U, 0x33ED7D2AU,
0xE72719C1U, 0x154C9AC2U, 0x061C6936U, 0xF477EA35U,
0xAA64D611U, 0x580F5512U, 0x4B5FA6E6U, 0xB93425E5U,
0x6DFE410EU, 0x9F95C20DU, 0x8CC531F9U, 0x7EAEB2FAU,
0x30E349B1U, 0xC288CAB2U, 0xD1D83946U, 0x23B3BA45U,
0xF779DEAEU, 0x05125DADU, 0x1642AE59U, 0xE4292D5AU,
0xBA3A117EU, 0x4851927DU, 0x5B016189U, 0xA96AE28AU,
0x7DA08661U, 0x8FCB0562U, 0x9C9BF696U, 0x6EF07595U,
0x417B1DBCU, 0xB3109EBFU, 0xA0406D4BU, 0x522BEE48U,
0x86E18AA3U, 0x748A09A0U, 0x67DAFA54U, 0x95B17957U,
0xCBA24573U, 0x39C9C670U, 0x2A993584U, 0xD8F2B687U,
0x0C38D26CU, 0xFE53516FU, 0xED03A29BU, 0x1F682198U,
0x5125DAD3U, 0xA34E59D0U, 0xB01EAA24U, 0x42752927U,
0x96BF4DCCU, 0x64D4CECFU, 0x77843D3BU, 0x85EFBE38U,
0xDBFC821CU, 0x2997011FU, 0x3AC7F2EBU, 0xC8AC71E8U,
0x1C661503U, 0xEE0D9600U, 0xFD5D65F4U, 0x0F36E6F7U,
0x61C69362U, 0x93AD1061U, 0x80FDE395U, 0x72966096U,
0xA65C047DU, 0x5437877EU, 0x4767748AU, 0xB50CF789U,
0xEB1FCBADU, 0x197448AEU, 0x0A24BB5AU, 0xF84F3859U,
0x2C855CB2U, 0xDEEEDFB1U, 0xCDBE2C45U, 0x3FD5AF46U,
0x7198540DU, 0x83F3D70EU, 0x90A324FAU, 0x62C8A7F9U,
0xB602C312U, 0x44694011U, 0x5739B3E5U, 0xA55230E6U,
0xFB410CC2U, 0x092A8FC1U, 0x1A7A7C35U, 0xE811FF36U,
0x3CDB9BDDU, 0xCEB018DEU, 0xDDE0EB2AU, 0x2F8B6829U,
0x82F63B78U, 0x709DB87BU, 0x63CD4B8FU, 0x91A6C88CU,
0x456CAC67U, 0xB7072F64U, 0xA457DC90U, 0x563C5F93U,
0x082F63B7U, 0xFA44E0B4U, 0xE9141340U, 0x1B7F9043U,
0xCFB5F4A8U, 0x3DDE77ABU, 0x2E8E845FU, 0xDCE5075CU,
0x92A8FC17U, 0x60C37F14U, 0x73938CE0U, 0x81F80FE3U,
0x55326B08U, 0xA759E80BU, 0xB4091BFFU, 0x466298FCU,
0x1871A4D8U, 0xEA1A27DBU, 0xF94AD42FU, 0x0B21572CU,
0xDFEB33C7U, 0x2D80B0C4U, 0x3ED04330U, 0xCCBBC033U,
0xA24BB5A6U, 0x502036A5U, 0x4370C551U, 0xB11B4652U,
0x65D122B9U, 0x97BAA1BAU, 0x84EA524EU, 0x7681D14DU,
0x2892ED69U, 0xDAF96E6AU, 0xC9A99D9EU, 0x3BC21E9DU,
0xEF087A76U, 0x1D63F975U, 0x0E330A81U, 0xFC588982U,
0xB21572C9U, 0x407EF1CAU, 0x532E023EU, 0xA145813DU,
0x758FE5D6U, 0x87E466D5U, 0x94B49521U, 0x66DF1622U,
0x38CC2A06U, 0xCAA7A905U, 0xD9F75AF1U, 0x2B9CD9F2U,
0xFF56BD19U, 0x0D3D3E1AU, 0x1E6DCDEEU, 0xEC064EEDU,
0xC38D26C4U, 0x31E6A5C7U, 0x22B65633U, 0xD0DDD530U,
0x0417B1DBU, 0xF67C32D8U, 0xE52CC12CU, 0x1747422FU,
0x49547E0BU, 0xBB3FFD08U, 0xA86F0EFCU, 0x5A048DFFU,
0x8ECEE914U, 0x7CA56A17U, 0x6FF599E3U, 0x9D9E1AE0U,
0xD3D3E1ABU, 0x21B862A8U, 0x32E8915CU, 0xC083125FU,
0x144976B4U, 0xE622F5B7U, 0xF5720643U, 0x07198540U,
0x590AB964U, 0xAB613A67U, 0xB831C993U, 0x4A5A4A90U,
0x9E902E7BU, 0x6CFBAD78U, 0x7FAB5E8CU, 0x8DC0DD8FU,
0xE330A81AU, 0x115B2B19U, 0x020BD8EDU, 0xF0605BEEU,
0x24AA3F05U, 0xD6C1BC06U, 0xC5914FF2U, 0x37FACCF1U,
0x69E9F0D5U, 0x9B8273D6U, 0x88D28022U, 0x7AB90321U,
0xAE7367CAU, 0x5C18E4C9U, 0x4F48173DU, 0xBD23943EU,
0xF36E6F75U, 0x0105EC76U, 0x12551F82U, 0xE03E9C81U,
0x34F4F86AU, 0xC69F7B69U, 0xD5CF889DU, 0x27A40B9EU,
0x79B737BAU, 0x8BDCB4B9U, 0x988C474DU, 0x6AE7C44EU,
0xBE2DA0A5U, 0x4C4623A6U, 0x5F16D052U, 0xAD7D5351U,
};
static guint32
crc32c (const guint8* buf, unsigned int len, guint32 crc32_init)
{
unsigned int i;
guint32 crc;
crc = crc32_init;
for (i = 0; i < len; i++)
CRC32C(crc, buf[i]);
return crc;
}
static guint32
finalize_crc32c (guint32 crc)
{
guint32 result;
guint8 byte0,byte1,byte2,byte3;
result = ~crc;
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;
}
/*----------------------------------------------------------------------
* Write current packet out
*/
static int
write_current_packet (gboolean cont)
{
guint32 length = 0;
guint16 padding_length = 0;
int err;
gboolean success;
if (curr_offset > header_length) {
/* Write the packet */
/* Is direction indication on with an outbound packet? */
gboolean isOutbound = has_direction && (direction == PACK_FLAGS_DIRECTION_OUTBOUND);
/* Compute packet length */
length = curr_offset;
if (hdr_sctp) {
padding_length = number_of_padding_bytes(length - header_length );
} else {
padding_length = 0;
}
/* Reset curr_offset, since we now write the headers */
curr_offset = 0;
/* Write Ethernet header */
if (hdr_ethernet) {
if (isOutbound)
{
memcpy(HDR_ETHERNET.dest_addr, hdr_eth_src_addr, 6);
memcpy(HDR_ETHERNET.src_addr, hdr_eth_dest_addr, 6);
} else {
memcpy(HDR_ETHERNET.dest_addr, hdr_eth_dest_addr, 6);
memcpy(HDR_ETHERNET.src_addr, hdr_eth_src_addr, 6);
}
HDR_ETHERNET.l3pid = g_htons(hdr_ethernet_proto);
write_bytes((const char *)&HDR_ETHERNET, sizeof(HDR_ETHERNET));
}
/* Write IP header */
if (hdr_ip) {
if (isOutbound) {
HDR_IP.src_addr = hdr_ip_dest_addr ? hdr_ip_dest_addr : IP_DST;
HDR_IP.dest_addr = hdr_ip_src_addr? hdr_ip_src_addr : IP_SRC;
}
else {
HDR_IP.src_addr = hdr_ip_src_addr? hdr_ip_src_addr : IP_SRC;
HDR_IP.dest_addr = hdr_ip_dest_addr ? hdr_ip_dest_addr : IP_DST;
}
HDR_IP.packet_length = g_htons(length - ip_offset + padding_length);
HDR_IP.protocol = (guint8) hdr_ip_proto;
HDR_IP.hdr_checksum = 0;
HDR_IP.hdr_checksum = in_checksum(&HDR_IP, sizeof(HDR_IP));
write_bytes((const char *)&HDR_IP, sizeof(HDR_IP));
/* 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;
if (hdr_tcp) {
pseudoh.length = g_htons(length - header_length + sizeof(HDR_TCP));
} else if (hdr_udp) {
pseudoh.length = g_htons(length - header_length + sizeof(HDR_UDP));
}
} else if (hdr_ipv6) {
if (memcmp(isOutbound ? &hdr_ipv6_dest_addr : &hdr_ipv6_src_addr, &NO_IPv6_ADDRESS, sizeof(ws_in6_addr)))
memcpy(&HDR_IPv6.ip6_src, isOutbound ? &hdr_ipv6_dest_addr : &hdr_ipv6_src_addr, sizeof(ws_in6_addr));
if (memcmp(isOutbound ? &hdr_ipv6_src_addr : &hdr_ipv6_dest_addr, &NO_IPv6_ADDRESS, sizeof(ws_in6_addr)))
memcpy(&HDR_IPv6.ip6_dst, isOutbound ? &hdr_ipv6_src_addr : &hdr_ipv6_dest_addr, sizeof(ws_in6_addr));
HDR_IPv6.ip6_ctlun.ip6_un2_vfc &= 0x0F;
HDR_IPv6.ip6_ctlun.ip6_un2_vfc |= (6<< 4);
HDR_IPv6.ip6_ctlun.ip6_un1.ip6_un1_plen = g_htons(length - ip_offset - sizeof(HDR_IPv6) + padding_length);
HDR_IPv6.ip6_ctlun.ip6_un1.ip6_un1_nxt = (guint8) hdr_ip_proto;
HDR_IPv6.ip6_ctlun.ip6_un1.ip6_un1_hlim = 32;
write_bytes((const char *)&HDR_IPv6, sizeof(HDR_IPv6));
/* initialize pseudo ipv6 header for checksum calculation */
pseudoh6.src_addr6 = HDR_IPv6.ip6_src;
pseudoh6.dst_addr6 = HDR_IPv6.ip6_dst;
memset(pseudoh6.zero, 0, sizeof(pseudoh6.zero));
pseudoh6.next_header = (guint8) hdr_ip_proto;
if (hdr_tcp) {
pseudoh6.length = g_htons(length - header_length + sizeof(HDR_TCP));
} else if (hdr_udp) {
pseudoh6.length = g_htons(length - header_length + sizeof(HDR_UDP));
}
}
/* Write UDP header */
if (hdr_udp) {
guint16 x16;
guint32 u;
/* initialize the UDP header */
HDR_UDP.source_port = isOutbound ? g_htons(hdr_dest_port): g_htons(hdr_src_port);
HDR_UDP.dest_port = isOutbound ? g_htons(hdr_src_port) : g_htons(hdr_dest_port);
HDR_UDP.length = hdr_ipv6 ? pseudoh6.length : pseudoh.length;
HDR_UDP.checksum = 0;
/* Note: g_ntohs()/g_htons() macro arg may be eval'd twice so calc value before invoking macro */
x16 = hdr_ipv6 ? in_checksum(&pseudoh6, sizeof(pseudoh6)) : in_checksum(&pseudoh, sizeof(pseudoh));
u = g_ntohs(x16);
x16 = in_checksum(&HDR_UDP, sizeof(HDR_UDP));
u += g_ntohs(x16);
x16 = in_checksum(packet_buf + header_length, length - header_length);
u += g_ntohs(x16);
x16 = (u & 0xffff) + (u>>16);
HDR_UDP.checksum = g_htons(x16);
if (HDR_UDP.checksum == 0) /* differentiate between 'none' and 0 */
HDR_UDP.checksum = g_htons(1);
write_bytes((const char *)&HDR_UDP, sizeof(HDR_UDP));
}
/* Write TCP header */
if (hdr_tcp) {
guint16 x16;
guint32 u;
/* initialize the TCP header */
HDR_TCP.source_port = isOutbound ? g_htons(hdr_dest_port): g_htons(hdr_src_port);
HDR_TCP.dest_port = isOutbound ? g_htons(hdr_src_port) : g_htons(hdr_dest_port);
/* set ack number if we have direction */
if (has_direction) {
HDR_TCP.flags = 0x10;
HDR_TCP.ack_num = g_ntohl(isOutbound ? tcp_out_seq_num : tcp_in_seq_num);
HDR_TCP.ack_num = g_htonl(HDR_TCP.ack_num);
}
else {
HDR_TCP.flags = 0;
HDR_TCP.ack_num = 0;
}
HDR_TCP.seq_num = isOutbound ? tcp_in_seq_num : tcp_out_seq_num;
HDR_TCP.window = g_htons(0x2000);
HDR_TCP.checksum = 0;
/* Note: g_ntohs()/g_htons() macro arg may be eval'd twice so calc value before invoking macro */
x16 = hdr_ipv6 ? in_checksum(&pseudoh6, sizeof(pseudoh6)) : in_checksum(&pseudoh, sizeof(pseudoh));
u = g_ntohs(x16);
x16 = in_checksum(&HDR_TCP, sizeof(HDR_TCP));
u += g_ntohs(x16);
x16 = in_checksum(packet_buf + header_length, length - header_length);
u += g_ntohs(x16);
x16 = (u & 0xffff) + (u>>16);
HDR_TCP.checksum = g_htons(x16);
if (HDR_TCP.checksum == 0) /* differentiate between 'none' and 0 */
HDR_TCP.checksum = g_htons(1);
write_bytes((const char *)&HDR_TCP, sizeof(HDR_TCP));
if (isOutbound) {
tcp_in_seq_num = g_ntohl(tcp_in_seq_num) + length - header_length;
tcp_in_seq_num = g_htonl(tcp_in_seq_num);
}
else {
tcp_out_seq_num = g_ntohl(tcp_out_seq_num) + length - header_length;
tcp_out_seq_num = g_htonl(tcp_out_seq_num);
}
}
/* Compute DATA chunk header */
if (hdr_data_chunk) {
hdr_data_chunk_bits = 0;
if (packet_start == 0) {
hdr_data_chunk_bits |= 0x02;
}
if (!cont) {
hdr_data_chunk_bits |= 0x01;
}
HDR_DATA_CHUNK.type = hdr_data_chunk_type;
HDR_DATA_CHUNK.bits = hdr_data_chunk_bits;
HDR_DATA_CHUNK.length = g_htons(length - header_length + 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);
hdr_data_chunk_tsn++;
if (!cont) {
hdr_data_chunk_ssn++;
}
}
/* Write SCTP common header */
if (hdr_sctp) {
guint32 zero = 0;
HDR_SCTP.src_port = isOutbound ? g_htons(hdr_sctp_dest): g_htons(hdr_sctp_src);
HDR_SCTP.dest_port = isOutbound ? g_htons(hdr_sctp_src) : 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), ~0);
if (hdr_data_chunk) {
HDR_SCTP.checksum = crc32c((guint8 *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
HDR_SCTP.checksum = crc32c((guint8 *)packet_buf + header_length, length - header_length, HDR_SCTP.checksum);
HDR_SCTP.checksum = crc32c((guint8 *)&zero, padding_length, HDR_SCTP.checksum);
} else {
HDR_SCTP.checksum = crc32c((guint8 *)packet_buf + header_length, length - header_length, HDR_SCTP.checksum);
}
HDR_SCTP.checksum = finalize_crc32c(HDR_SCTP.checksum);
HDR_SCTP.checksum = g_htonl(HDR_SCTP.checksum);
write_bytes((const char *)&HDR_SCTP, sizeof(HDR_SCTP));
}
/* Write DATA chunk header */
if (hdr_data_chunk) {
write_bytes((const char *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK));
}
/* Reset curr_offset, since we now write the trailers */
curr_offset = length;
/* Write DATA chunk padding */
if (hdr_data_chunk && (padding_length > 0)) {
memset(tempbuf, 0, padding_length);
write_bytes((const char *)&tempbuf, padding_length);
length += padding_length;
}
/* Write Ethernet trailer */
if (hdr_ethernet && (length < 60)) {
memset(tempbuf, 0, 60 - length);
write_bytes((const char *)&tempbuf, 60 - length);
length = 60;
}
if (use_pcapng) {
success = pcapng_write_enhanced_packet_block(output_file,
NULL,
ts_sec, ts_nsec,
length, length,
0,
1000000000,
packet_buf,
(direction << PACK_FLAGS_DIRECTION_SHIFT),
&bytes_written, &err);
} else {
success = libpcap_write_packet(output_file,
ts_sec, ts_nsec/1000,
length, length,
packet_buf,
&bytes_written, &err);
}
if (!success) {
fprintf(stderr, "File write error [%s] : %s\n",
output_filename, g_strerror(err));
return EXIT_FAILURE;
}
if (ts_fmt == NULL) {
/* fake packet counter */
if (use_pcapng)
ts_nsec++;
else
ts_nsec += 1000;
}
if (!quiet) {
fprintf(stderr, "Wrote packet of %u bytes.\n", length);
}
num_packets_written++;
}
packet_start += curr_offset - header_length;
curr_offset = header_length;
return EXIT_SUCCESS;
}
/*----------------------------------------------------------------------
* Write file header and trailer
*/
static int
write_file_header (void)
{
int err;
gboolean success;
if (use_pcapng) {
char *comment;
GPtrArray *comments;
comment = g_strdup_printf("Generated from input file %s.", input_filename);
comments = g_ptr_array_new_with_free_func(g_free);
g_ptr_array_add(comments, comment);
success = pcapng_write_section_header_block(output_file,
comments,
NULL, /* HW */
NULL, /* OS */
get_appname_and_version(),
-1, /* section_length */
&bytes_written,
&err);
g_ptr_array_free(comments, TRUE);
if (success) {
success = pcapng_write_interface_description_block(output_file,
NULL,
interface_name,
NULL,
"",
NULL,
NULL,
pcap_link_type,
WTAP_MAX_PACKET_SIZE_STANDARD,
&bytes_written,
0,
9,
&err);
}
} else {
success = libpcap_write_file_header(output_file, pcap_link_type,
WTAP_MAX_PACKET_SIZE_STANDARD, FALSE,
&bytes_written, &err);
}
if (!success) {
fprintf(stderr, "File write error [%s] : %s\n",
output_filename, g_strerror(err));
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
/*----------------------------------------------------------------------
* 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 */
(void) g_strlcpy(&packet_preamble[packet_preamble_len], str, PACKET_PREAMBLE_MAX_LEN);
packet_preamble_len += (int) toklen;
if (debug >= 2) {
char *c;
char xs[PACKET_PREAMBLE_MAX_LEN];
(void) g_strlcpy(xs, packet_preamble, PACKET_PREAMBLE_MAX_LEN);
while ((c = strchr(xs, '\r')) != NULL) *c=' ';
fprintf (stderr, "[[append_to_preamble: \"%s\"]]", xs);
}
}
}
/*----------------------------------------------------------------------
* Parse the preamble to get the timecode.
*/
static void
parse_preamble (void)
{
struct tm timecode;
char *subsecs;
char *p;
int subseclen;
int i;
/*
* Null-terminate the preamble.
*/
packet_preamble[packet_preamble_len] = '\0';
if (debug > 0)
fprintf(stderr, "[[parse_preamble: \"%s\"]]\n", packet_preamble);
if (has_direction) {
switch (packet_preamble[0]) {
case 'i':
case 'I':
direction = PACK_FLAGS_DIRECTION_INBOUND;
packet_preamble[0] = ' ';
break;
case 'o':
case 'O':
direction = PACK_FLAGS_DIRECTION_OUTBOUND;
packet_preamble[0] = ' ';
break;
default:
direction = PACK_FLAGS_DIRECTION_UNKNOWN;
break;
}
i = 0;
while (packet_preamble[i] == ' ' ||
packet_preamble[i] == '\r' ||
packet_preamble[i] == '\t') {
i++;
}
packet_preamble_len -= i;
/* Also move the trailing '\0'. */
memmove(packet_preamble, packet_preamble + i, packet_preamble_len + 1);
}
/*
* If no "-t" flag was specified, don't attempt to parse the packet
* preamble to extract a time stamp.
*/
if (ts_fmt == NULL) {