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wireshark/ui/text_import.c

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/* text_import.c
* State machine for text import
* November 2010, Jaap Keuter <jaap.keuter@xs4all.nl>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Based on text2pcap.c by Ashok Narayanan <ashokn@cisco.com>
*
* 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 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 64KiB-1. Packet
* snaplength is automatically set to 64KiB-1.
*/
#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 <time.h>
#include <glib.h>
#include <errno.h>
#include <assert.h>
#include <epan/tvbuff.h>
#include <wsutil/crc32.h>
#include <epan/in_cksum.h>
#ifndef HAVE_STRPTIME
# include "wsutil/strptime.h"
#endif
#include "text_import.h"
#include "text_import_scanner.h"
#include "text_import_scanner_lex.h"
/*--- Options --------------------------------------------------------------------*/
/* Debug level */
static int debug = 0;
/* Dummy Ethernet header */
static int hdr_ethernet = FALSE;
static guint32 hdr_ethernet_proto = 0;
/* Dummy IP header */
static int hdr_ip = FALSE;
static guint hdr_ip_proto = 0;
/* Dummy UDP header */
static int hdr_udp = FALSE;
static guint32 hdr_dest_port = 0;
static guint32 hdr_src_port = 0;
/* Dummy TCP header */
static int hdr_tcp = FALSE;
/* Dummy SCTP header */
static int 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 int hdr_data_chunk = FALSE;
static guint8 hdr_data_chunk_type = 0;
static guint8 hdr_data_chunk_bits = 3;
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;
static gboolean has_direction = FALSE;
static guint32 direction = 0;
/*--- Local data -----------------------------------------------------------------*/
/* This is where we store the packet currently being built */
static guint8 *packet_buf;
static guint32 curr_offset = 0;
static guint32 max_offset = IMPORT_MAX_PACKET;
static guint32 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 guint8 packet_preamble[PACKET_PREAMBLE_MAX_LEN+1];
static int packet_preamble_len = 0;
/* Time code of packet, derived from packet_preamble */
static time_t ts_sec = 0;
static guint32 ts_usec = 0;
static char *ts_fmt = NULL;
static struct tm timecode_default;
static wtap_dumper* wdh;
/* HDR_ETH Offset base to parse */
static guint32 offset_base = 16;
/* ----- 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 = {
{0x20, 0x52, 0x45, 0x43, 0x56, 0x00},
{0x20, 0x53, 0x45, 0x4E, 0x44, 0x00},
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};
/* Link-layer type; see net/bpf.h for details */
static guint 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 guint32
parse_num (const char *str, int offset)
{
unsigned long num;
char *c;
if (str == NULL) {
fprintf(stderr, "FATAL ERROR: str is NULL\n");
exit(1);
}
num = strtoul(str, &c, offset ? offset_base : 16);
if (c==str) {
fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
}
return (guint32)num;
}
/*----------------------------------------------------------------------
* Write this byte into current packet
*/
static void
write_byte (const char *str)
{
guint32 num;
num = parse_num(str, FALSE);
packet_buf[curr_offset] = (guint8) num;
curr_offset ++;
if (curr_offset >= max_offset) /* packet full */
start_new_packet();
}
/*----------------------------------------------------------------------
* Remove bytes from the current packet
*/
static void
unwrite_bytes (guint32 nbytes)
{
curr_offset -= nbytes;
}
/*----------------------------------------------------------------------
* Determin 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;
}
/*----------------------------------------------------------------------
* Write current packet out
*/
void
write_current_packet (void)
{
int prefix_length = 0;
int proto_length = 0;
int ip_length = 0;
int eth_trailer_length = 0;
int prefix_index = 0;
int i, padding_length;
if (curr_offset > 0) {
/* Write the packet */
/* Compute packet length */
prefix_length = 0;
if (hdr_data_chunk) { prefix_length += (int)sizeof(HDR_DATA_CHUNK); }
if (hdr_sctp) { prefix_length += (int)sizeof(HDR_SCTP); }
if (hdr_udp) { prefix_length += (int)sizeof(HDR_UDP); proto_length = prefix_length + curr_offset; }
if (hdr_tcp) { prefix_length += (int)sizeof(HDR_TCP); proto_length = prefix_length + curr_offset; }
if (hdr_ip) {
prefix_length += (int)sizeof(HDR_IP);
ip_length = prefix_length + curr_offset + ((hdr_data_chunk) ? number_of_padding_bytes(curr_offset) : 0);
}
if (hdr_ethernet) { prefix_length += (int)sizeof(HDR_ETHERNET); }
/* Make room for dummy header */
memmove(&packet_buf[prefix_length], packet_buf, curr_offset);
if (hdr_ethernet) {
/* Pad trailer */
if (prefix_length + curr_offset < 60) {
eth_trailer_length = 60 - (prefix_length + curr_offset);
}
}
/* Write Ethernet header */
if (hdr_ethernet) {
HDR_ETHERNET.l3pid = g_htons(hdr_ethernet_proto);
memcpy(&packet_buf[prefix_index], &HDR_ETHERNET, sizeof(HDR_ETHERNET));
prefix_index += (int)sizeof(HDR_ETHERNET);
}
/* Write IP header */
if (hdr_ip) {
vec_t cksum_vector[1];
HDR_IP.packet_length = g_htons(ip_length);
HDR_IP.protocol = (guint8) hdr_ip_proto;
HDR_IP.hdr_checksum = 0;
cksum_vector[0].ptr = (guint8 *)&HDR_IP; cksum_vector[0].len = sizeof(HDR_IP);
HDR_IP.hdr_checksum = in_cksum(cksum_vector, 1);
memcpy(&packet_buf[prefix_index], &HDR_IP, sizeof(HDR_IP));
prefix_index += (int)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;
pseudoh.length = g_htons(proto_length);
/* Write UDP header */
if (hdr_udp) {
vec_t cksum_vector[3];
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;
cksum_vector[0].ptr = (guint8 *)&pseudoh; cksum_vector[0].len = sizeof(pseudoh);
cksum_vector[1].ptr = (guint8 *)&HDR_UDP; cksum_vector[1].len = sizeof(HDR_UDP);
cksum_vector[2].ptr = &packet_buf[prefix_length]; cksum_vector[2].len = curr_offset;
HDR_UDP.checksum = in_cksum(cksum_vector, 3);
memcpy(&packet_buf[prefix_index], &HDR_UDP, sizeof(HDR_UDP));
prefix_index += (int)sizeof(HDR_UDP);
}
/* Write TCP header */
if (hdr_tcp) {
vec_t cksum_vector[3];
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;
cksum_vector[0].ptr = (guint8 *)&pseudoh; cksum_vector[0].len = sizeof(pseudoh);
cksum_vector[1].ptr = (guint8 *)&HDR_TCP; cksum_vector[1].len = sizeof(HDR_TCP);
cksum_vector[2].ptr = &packet_buf[prefix_length]; cksum_vector[2].len = curr_offset;
HDR_TCP.checksum = in_cksum(cksum_vector, 3);
memcpy(&packet_buf[prefix_index], &HDR_TCP, sizeof(HDR_TCP));
prefix_index += (int)sizeof(HDR_TCP);
}
/* 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++)
packet_buf[prefix_length+curr_offset+i] = 0;
curr_offset += padding_length;
}
/* 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_calculate(&HDR_SCTP, sizeof(HDR_SCTP), CRC32C_PRELOAD);
if (hdr_data_chunk)
HDR_SCTP.checksum = crc32c_calculate(&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
HDR_SCTP.checksum = g_htonl(~crc32c_calculate(&packet_buf[prefix_length], curr_offset, HDR_SCTP.checksum));
memcpy(&packet_buf[prefix_index], &HDR_SCTP, sizeof(HDR_SCTP));
prefix_index += (int)sizeof(HDR_SCTP);
}
/* Write DATA chunk header */
if (hdr_data_chunk) {
memcpy(&packet_buf[prefix_index], &HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK));
/*prefix_index += (int)sizeof(HDR_DATA_CHUNK);*/
}
/* Write Ethernet trailer */
if (hdr_ethernet && eth_trailer_length > 0) {
memset(&packet_buf[prefix_length+curr_offset], 0, eth_trailer_length);
}
HDR_TCP.seq_num = g_ntohl(HDR_TCP.seq_num) + curr_offset;
HDR_TCP.seq_num = g_htonl(HDR_TCP.seq_num);
{
/* Write the packet */
wtap_rec rec;
int err;
gchar *err_info;
memset(&rec, 0, sizeof rec);
rec.rec_type = REC_TYPE_PACKET;
rec.ts.secs = (guint32)ts_sec;
rec.ts.nsecs = ts_usec * 1000;
if (ts_fmt == NULL) { ts_usec++; } /* fake packet counter */
rec.rec_header.packet_header.caplen = rec.rec_header.packet_header.len = prefix_length + curr_offset + eth_trailer_length;
rec.rec_header.packet_header.pkt_encap = pcap_link_type;
rec.rec_header.packet_header.pack_flags |= direction;
rec.presence_flags = WTAP_HAS_CAP_LEN|WTAP_HAS_INTERFACE_ID|WTAP_HAS_TS|WTAP_HAS_PACK_FLAGS;
/* XXX - report errors! */
if (!wtap_dump(wdh, &rec, packet_buf, &err, &err_info)) {
switch (err) {
case WTAP_ERR_UNWRITABLE_REC_DATA:
g_free(err_info);
break;
default:
break;
}
}
}
}
packet_start += curr_offset;
curr_offset = 0;
}
/*----------------------------------------------------------------------
* 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++] = ' ';
}
if(str == NULL){
fprintf(stderr, "FATAL ERROR: str is NULL\n");
exit(1);
}
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 */
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];
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 (has_direction) {
switch (packet_preamble[0]) {
case 'i':
case 'I':
direction = 0x00000001;
packet_preamble[0] = ' ';
break;
case 'o':
case 'O':
direction = 0x00000002;
packet_preamble[0] = ' ';
break;
default:
direction = 0x00000000;
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 a packet
* preamble to extract a time stamp.
*/
if (ts_fmt == NULL)
return;
/*
* Initialize to today localtime, just in case not all fields
* of the date and time are specified.
*/
timecode = timecode_default;
ts_usec = 0;
/* Ensure preamble has more than two chars before attempting to parse.
* This should cover line breaks etc that get counted.
*/
if ( strlen(packet_preamble) > 2 ) {
/* Get Time leaving subseconds */
subsecs = strptime( packet_preamble, ts_fmt, &timecode );
if (subsecs != NULL) {
/* Get the long time from the tm structure */
/* (will return -1 if failure) */
ts_sec = 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 )
{
/* Sanitize - remove all '\r' */
char *c;
while ((c = strchr(packet_preamble, '\r')) != NULL) *c=' ';
fprintf (stderr, "Failure processing time \"%s\" using time format \"%s\"\n (defaulting to Jan 1,1970 00:00:00 GMT)\n",
packet_preamble, ts_fmt);
if (debug >= 2) {
fprintf(stderr, "timecode: %02d/%02d/%d %02d:%02d:%02d %d\n",
timecode.tm_mday, timecode.tm_mon, timecode.tm_year,
timecode.tm_hour, timecode.tm_min, timecode.tm_sec, timecode.tm_isdst);
}
ts_sec = 0; /* Jan 1,1970: 00:00 GMT; tshark/wireshark will display date/time as adjusted by timezone */
ts_usec = 0;
}
else
{
/* Parse subseconds */
ts_usec = (guint32)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 = (int) (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;
}
}
}
}
if (debug >= 2) {
char *c;
while ((c = strchr(packet_preamble, '\r')) != NULL) *c=' ';
fprintf(stderr, "[[parse_preamble: \"%s\"]]\n", packet_preamble);
fprintf(stderr, "Format(%s), time(%u), subsecs(%u)\n", ts_fmt, (guint32)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();
/* 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)
{
guint32 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;
case T_BYTE:
if (offset_base == 0) {
start_new_packet();
write_byte(str);
state = READ_BYTE;
}
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 %0X, got %0X. Ignoring rest of packet\n",
curr_offset, num);
write_current_packet();
state = INIT;
}
} else
state = READ_OFFSET;
break;
case T_BYTE:
if (offset_base == 0) {
write_byte(str);
state = READ_BYTE;
}
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]);
}
/*----------------------------------------------------------------------
* Import a text file.
*/
int
text_import(text_import_info_t *info)
{
yyscan_t scanner;
int ret;
struct tm *now_tm;
packet_buf = (guint8 *)g_malloc(sizeof(HDR_ETHERNET) + sizeof(HDR_IP) +
sizeof(HDR_SCTP) + sizeof(HDR_DATA_CHUNK) +
IMPORT_MAX_PACKET);
if (!packet_buf)
{
fprintf(stderr, "FATAL ERROR: no memory for packet buffer");
exit(-1);
}
/* Lets start from the beginning */
state = INIT;
curr_offset = 0;
packet_start = 0;
packet_preamble_len = 0;
ts_sec = time(0); /* initialize to current time */
now_tm = localtime(&ts_sec);
if (now_tm == NULL) {
/*
* This shouldn't happen - on UN*X, this should Just Work, and
* on Windows, it won't work if ts_sec is before the Epoch,
* but it's long after 1970, so....
*/
fprintf(stderr, "localtime(right now) failed\n");
exit(-1);
}
timecode_default = *now_tm;
timecode_default.tm_isdst = -1; /* Unknown for now, depends on time given to the strptime() function */
ts_usec = 0;
/* Dummy headers */
hdr_ethernet = FALSE;
hdr_ip = FALSE;
hdr_udp = FALSE;
hdr_tcp = FALSE;
hdr_sctp = FALSE;
hdr_data_chunk = FALSE;
offset_base = (info->offset_type == OFFSET_NONE) ? 0 :
(info->offset_type == OFFSET_HEX) ? 16 :
(info->offset_type == OFFSET_OCT) ? 8 :
(info->offset_type == OFFSET_DEC) ? 10 :
16;
has_direction = info->has_direction;
if (info->date_timestamp)
{
ts_fmt = info->date_timestamp_format;
}
pcap_link_type = info->encapsulation;
wdh = info->wdh;
switch (info->dummy_header_type)
{
case HEADER_ETH:
hdr_ethernet = TRUE;
hdr_ethernet_proto = info->pid;
break;
case HEADER_IPV4:
hdr_ip = TRUE;
hdr_ip_proto = info->protocol;
hdr_ethernet = TRUE;
hdr_ethernet_proto = 0x800;
break;
case HEADER_UDP:
hdr_udp = TRUE;
hdr_tcp = FALSE;
hdr_src_port = info->src_port;
hdr_dest_port = info->dst_port;
hdr_ip = TRUE;
hdr_ip_proto = 17;
hdr_ethernet = TRUE;
hdr_ethernet_proto = 0x800;
break;
case HEADER_TCP:
hdr_tcp = TRUE;
hdr_udp = FALSE;
hdr_src_port = info->src_port;
hdr_dest_port = info->dst_port;
hdr_ip = TRUE;
hdr_ip_proto = 6;
hdr_ethernet = TRUE;
hdr_ethernet_proto = 0x800;
break;
case HEADER_SCTP:
hdr_sctp = TRUE;
hdr_sctp_src = info->src_port;
hdr_sctp_dest = info->dst_port;
hdr_sctp_tag = info->tag;
hdr_ip = TRUE;
hdr_ip_proto = 132;
hdr_ethernet = TRUE;
hdr_ethernet_proto = 0x800;
break;
case HEADER_SCTP_DATA:
hdr_sctp = TRUE;
hdr_data_chunk = TRUE;
hdr_sctp_src = info->src_port;
hdr_sctp_dest = info->dst_port;
hdr_data_chunk_ppid = info->ppi;
hdr_ip = TRUE;
hdr_ip_proto = 132;
hdr_ethernet = TRUE;
hdr_ethernet_proto = 0x800;
break;
default:
break;
}
max_offset = info->max_frame_length;
if (text_import_lex_init(&scanner) != 0) {
ret = errno;
g_free(packet_buf);
return ret;
}
text_import_set_in(info->import_text_file, scanner);
text_import_lex(scanner);
text_import_lex_destroy(scanner);
g_free(packet_buf);
return 0;
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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