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wireshark/wiretap/network_instruments.c
Ronnie Sahlberg a60bb6ada9 make reading of observer files work again 
for some reason we have forgotten to skip the initial (always 8?) bytes prior to the start of the frame.
 

svn path=/trunk/; revision=14822
2005-06-30 02:31:15 +00:00

484 lines
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/*
* $Id$
*/
/***************************************************************************
NetworkInstruments.c - description
-------------------
begin : Wed Oct 29 2003
copyright : (C) 2003 by root
email : scotte[AT}netinst.com
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include "wtap-int.h"
#include "file_wrappers.h"
#include "buffer.h"
#include "network_instruments.h"
static const char network_instruments_magic[] = {"ObserverPktBufferVersion=09.00"};
static const int true_magic_length = 17;
static const guint32 observer_packet_magic = 0x88888888;
static const int observer_encap[] = {
WTAP_ENCAP_ETHERNET,
WTAP_ENCAP_TOKEN_RING
};
#define NUM_OBSERVER_ENCAPS (sizeof observer_encap / sizeof observer_encap[0])
#define OBSERVER_UNDEFINED 0xFF
#define OBSERVER_ETHERNET 0x00
#define OBSERVER_TOKENRING 0x01
#define OBSERVER_FDDI 0x02
static const int from_wtap_encap[] = {
OBSERVER_UNDEFINED,
OBSERVER_ETHERNET,
OBSERVER_TOKENRING,
};
#define NUM_FROM_WTAP_ENCAPS (sizeof from_wtap_encap / sizeof observer_encap[0])
#define CAPTUREFILE_HEADER_SIZE sizeof(capture_file_header)
#define INFORMATION_TYPE_ALIAS_LIST 0x01
#define INFORMATION_TYPE_COMMENT 0x02
/*
* The time in Observer files is in nanoseconds since midnight, January 1,
* 2000, 00:00:00 local time.
*
* We want the seconds portion to be seconds since midnight, January 1,
* 1970, 00:00:00 GMT.
*
* To do that, we add the number of seconds between midnight, January 1,
* 2000, 00:00:00 local time and midnight, January 1, 1970, 00:00:00 GMT.
* (That gets the wrong answer if the time zone is being read in a different
* time zone, but there's not much we can do about that.)
*/
static gboolean have_time_offset;
static time_t seconds1970to2000;
static void init_time_offset(void)
{
if (!have_time_offset) {
struct tm midnight_2000_01_01;
/*
* Get the number of seconds between midnight, January 1,
* 2000, 00:00:00 local time - that's just the UNIX
* time stamp for 2000-01-01 00:00:00 local time.
*/
midnight_2000_01_01.tm_year = 2000 - 1900;
midnight_2000_01_01.tm_mon = 0;
midnight_2000_01_01.tm_mday = 1;
midnight_2000_01_01.tm_hour = 0;
midnight_2000_01_01.tm_min = 0;
midnight_2000_01_01.tm_sec = 0;
midnight_2000_01_01.tm_isdst = -1;
seconds1970to2000 = mktime(&midnight_2000_01_01);
have_time_offset = TRUE;
}
}
static gboolean fill_time_struct(guint64 ns_since2000, observer_time* time_conversion);
static gboolean observer_read(wtap *wth, int *err, gchar **err_info,
long *data_offset);
static gboolean observer_seek_read(wtap *wth, long seek_off,
union wtap_pseudo_header *pseudo_header, guchar *pd, int length,
int *err, gchar **err_info);
static gboolean observer_dump_close(wtap_dumper *wdh, int *err);
static gboolean observer_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
const union wtap_pseudo_header *pseudo_header, const guchar *pd, int *err);
int network_instruments_open(wtap *wth, int *err, gchar **err_info)
{
int bytes_read;
capture_file_header file_header;
packet_entry_header packet_header;
errno = WTAP_ERR_CANT_READ;
/* Read in the buffer file header */
bytes_read = file_read(&file_header, sizeof file_header, 1, wth->fh);
if (bytes_read != sizeof file_header) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
return 0;
}
/* check the magic number */
if (memcmp(file_header.observer_version, network_instruments_magic, true_magic_length)!=0) {
return 0;
}
/* check the version */
if (strncmp(network_instruments_magic, file_header.observer_version, 30)!=0) {
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
*err_info = g_strdup_printf("Observer: unsupported file version %s", file_header.observer_version);
return -1;
}
/* get to the first packet */
file_header.offset_to_first_packet =
GUINT16_FROM_LE(file_header.offset_to_first_packet);
if (file_seek(wth->fh, file_header.offset_to_first_packet, SEEK_SET,
err) == -1) {
if (*err != 0)
return -1;
return 0;
}
/* pull off the packet header */
bytes_read = file_read(&packet_header, sizeof packet_header, 1, wth->fh);
if (bytes_read != sizeof packet_header) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
return 0;
}
/* check the packet's magic number; the magic number is all 8's,
so the byte order doesn't matter */
if (packet_header.packet_magic != observer_packet_magic) {
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
*err_info = g_strdup_printf("Observer: unsupported packet version %ul", packet_header.packet_magic);
return -1;
}
/* Check the data link type. */
if (packet_header.network_type >= NUM_OBSERVER_ENCAPS) {
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
*err_info = g_strdup_printf("observer: network type %u unknown or unsupported", packet_header.network_type);
return -1;
}
wth->file_encap = observer_encap[packet_header.network_type];
wth->file_type = WTAP_FILE_NETWORK_INSTRUMENTS_V9;
/* set up the rest of the capture parameters */
wth->subtype_read = observer_read;
wth->subtype_seek_read = observer_seek_read;
wth->subtype_close = NULL;
wth->subtype_sequential_close = NULL;
wth->snapshot_length = 0;
/* reset the pointer to the first packet */
if (file_seek(wth->fh, file_header.offset_to_first_packet, SEEK_SET,
err) == -1) {
if (*err != 0)
return -1;
return 0;
}
wth->data_offset = file_header.offset_to_first_packet;
init_time_offset();
return 1;
}
/* reads the next packet */
static gboolean observer_read(wtap *wth, int *err, gchar **err_info,
long *data_offset)
{
int bytes_read;
long seek_increment;
long seconds, useconds;
packet_entry_header packet_header;
observer_time packet_time;
*data_offset = wth->data_offset;
/* pull off the packet header */
bytes_read = file_read(&packet_header, sizeof packet_header, 1, wth->fh);
if (bytes_read != sizeof packet_header) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
return 0;
}
wth->data_offset += bytes_read;
/* check the packet's magic number; the magic number is all 8's,
so the byte order doesn't matter */
if (packet_header.packet_magic != observer_packet_magic) {
*err = WTAP_ERR_BAD_RECORD;
*err_info = g_strdup("Observer: bad record");
return FALSE;
}
/* convert from observer time to wiretap time */
packet_header.nano_seconds_since_2000 =
GUINT64_FROM_LE(packet_header.nano_seconds_since_2000);
fill_time_struct(packet_header.nano_seconds_since_2000, &packet_time);
useconds = (long)(packet_time.useconds_from_1970 - ((guint64)packet_time.seconds_from_1970)*1000000);
seconds = (long)packet_time.seconds_from_1970;
/* set-up the packet header */
packet_header.network_size =
GUINT16_FROM_LE(packet_header.network_size);
packet_header.captured_size =
GUINT16_FROM_LE(packet_header.captured_size);
wth->phdr.pkt_encap = observer_encap[packet_header.network_type];
wth->phdr.len = packet_header.network_size-4; /* neglect frame markers for wiretap */
wth->phdr.caplen = MIN(packet_header.captured_size, wth->phdr.len);
wth->phdr.ts.tv_sec = seconds;
wth->phdr.ts.tv_usec = useconds;
/* get to the frame data */
packet_header.offset_to_frame =
GUINT16_FROM_LE(packet_header.offset_to_frame);
if (packet_header.offset_to_frame < sizeof(packet_header)) {
*err = WTAP_ERR_BAD_RECORD;
*err_info = g_strdup_printf("Observer: bad record (offset to frame %u < %lu)",
packet_header.offset_to_frame,
(unsigned long)sizeof(packet_header));
return FALSE;
}
seek_increment = packet_header.offset_to_frame - sizeof(packet_header);
if(seek_increment>0) {
if (file_seek(wth->fh, seek_increment, SEEK_CUR, err) == -1)
return FALSE;
}
wth->data_offset += seek_increment;
/* set-up the packet buffer */
buffer_assure_space(wth->frame_buffer, packet_header.captured_size);
wtap_file_read_expected_bytes(buffer_start_ptr(wth->frame_buffer), packet_header.captured_size, wth->fh, err);
wth->data_offset += packet_header.captured_size;
/* update the pseudo header */
switch (wth->file_encap) {
case WTAP_ENCAP_ETHERNET:
/* There is no FCS in the frame */
wth->pseudo_header.eth.fcs_len = 0;
break;
}
return TRUE;
}
/* reads a packet at an offset */
static gboolean observer_seek_read(wtap *wth, long seek_off,
union wtap_pseudo_header *pseudo_header, guchar *pd, int length,
int *err, gchar **err_info)
{
packet_entry_header packet_header;
long seek_increment;
int bytes_read;
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
return FALSE;
/* pull off the packet header */
bytes_read = file_read(&packet_header, sizeof packet_header, 1, wth->random_fh);
if (bytes_read != sizeof packet_header) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
return 0;
}
/* check the packets magic number */
if (packet_header.packet_magic != observer_packet_magic) {
*err = WTAP_ERR_BAD_RECORD;
*err_info = g_strdup("Observer: bad magic number for record in observer_seek_read");
return FALSE;
}
/* get the frame offset */
packet_header.offset_to_frame =
GUINT16_FROM_LE(packet_header.offset_to_frame);
seek_increment = packet_header.offset_to_frame - sizeof(packet_header);
if(seek_increment>0) {
if (file_seek(wth->random_fh, seek_increment, SEEK_CUR, err) == -1)
return FALSE;
}
/* read in the packet */
bytes_read = file_read(pd, 1, length, wth->random_fh);
if (bytes_read != length) {
*err = file_error(wth->fh);
return FALSE;
}
/* update the pseudo header */
switch (wth->file_encap) {
case WTAP_ENCAP_ETHERNET:
/* There is no FCS in the frame */
pseudo_header->eth.fcs_len = 0;
break;
}
return TRUE;
}
gboolean fill_time_struct(guint64 ns_since2000, observer_time* time_conversion)
{
time_conversion->ns_since2000 = ns_since2000;
time_conversion->us_since2000 = ns_since2000/1000;
time_conversion->sec_since2000 = ns_since2000/1000000000;
time_conversion->seconds_from_1970 = (time_t) (seconds1970to2000 + time_conversion->sec_since2000);
time_conversion->useconds_from_1970 = ((guint64)seconds1970to2000*1000000)+time_conversion->us_since2000;
return TRUE;
}
/* Returns 0 if we could write the specified encapsulation type,
an error indication otherwise. */
int network_instruments_dump_can_write_encap(int encap)
{
/* Per-packet encapsulations aren't supported. */
if (encap == WTAP_ENCAP_PER_PACKET)
return WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED;
if (encap < 0 || (unsigned) encap > NUM_FROM_WTAP_ENCAPS || from_wtap_encap[encap] == OBSERVER_UNDEFINED)
return WTAP_ERR_UNSUPPORTED_ENCAP;
return 0;
}
/* Returns TRUE on success, FALSE on failure; sets "*err" to an error code on
failure */
gboolean network_instruments_dump_open(wtap_dumper *wdh, gboolean cant_seek, int *err)
{
capture_file_header file_header;
tlv_header comment_header;
char comment[64];
struct tm *current_time;
time_t system_time;
if (cant_seek) {
*err = WTAP_ERR_CANT_WRITE_TO_PIPE;
return FALSE;
}
wdh->subtype_write = observer_dump;
wdh->subtype_close = observer_dump_close;
wdh->dump.niobserver = g_malloc(sizeof(niobserver_dump_t));
wdh->dump.niobserver->packet_count = 0;
wdh->dump.niobserver->network_type = from_wtap_encap[wdh->encap];
/* create the file comment */
time(&system_time);
current_time = localtime(&system_time);
memset(&comment, 0x00, sizeof(comment));
sprintf(comment, "This capture was saved from Ethereal on %s", asctime(current_time));
/* create the file header */
if (fseek(wdh->fh, 0, SEEK_SET) == -1) {
*err = errno;
return FALSE;
}
memset(&file_header, 0x00, sizeof(capture_file_header));
strcpy(file_header.observer_version, network_instruments_magic);
file_header.offset_to_first_packet = sizeof(capture_file_header) + sizeof(tlv_header) + strlen(comment);
file_header.extra_information_present = 0x01; /* actually the number of information elements */
if(!fwrite(&file_header, sizeof(capture_file_header), 1, wdh->fh)) {
*err = errno;
return FALSE;
}
/* create the comment entry */
comment_header.type = INFORMATION_TYPE_COMMENT;
comment_header.length = sizeof(tlv_header) + strlen(comment);
if(!fwrite(&comment_header, sizeof(tlv_header), 1, wdh->fh)) {
*err = errno;
return FALSE;
}
if(!fwrite(&comment, sizeof(char), strlen(comment), wdh->fh)) {
*err = errno;
return FALSE;
}
init_time_offset();
return TRUE;
}
/* Write a record for a packet to a dump file.
Returns TRUE on success, FALSE on failure. */
static gboolean observer_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
const union wtap_pseudo_header *pseudo_header _U_, const guchar *pd,
int *err)
{
niobserver_dump_t *niobserver = wdh->dump.niobserver;
packet_entry_header packet_header;
size_t nwritten;
guint64 capture_nanoseconds = 0;
if(phdr->ts.tv_sec<(long)seconds1970to2000) {
if(phdr->ts.tv_sec<0)
capture_nanoseconds = 0;
else
capture_nanoseconds = phdr->ts.tv_sec;
} else
capture_nanoseconds = phdr->ts.tv_sec - seconds1970to2000;
capture_nanoseconds = ((capture_nanoseconds*1000000) + (guint64)phdr->ts.tv_usec)*1000;
memset(&packet_header, 0x00, sizeof(packet_entry_header));
packet_header.packet_magic = GUINT32_TO_LE(observer_packet_magic);
packet_header.network_speed = GUINT32_TO_LE(1000000);
packet_header.captured_size = GUINT16_TO_LE((guint16)phdr->caplen);
packet_header.network_size = GUINT16_TO_LE((guint16)(phdr->len+4));
packet_header.offset_to_frame = GUINT16_TO_LE(sizeof(packet_entry_header));
packet_header.offset_to_next_packet = GUINT16_TO_LE(sizeof(packet_entry_header) + phdr->caplen);
packet_header.network_type = niobserver->network_type;
packet_header.flags = 0x00;
packet_header.extra_information = 0x00;
packet_header.packet_type = 0x00;
packet_header.packet_number = GUINT64_TO_LE(niobserver->packet_count);
packet_header.original_packet_number = GUINT64_TO_LE(niobserver->packet_count);
niobserver->packet_count++;
packet_header.nano_seconds_since_2000 = GUINT64_TO_LE(capture_nanoseconds);
nwritten = fwrite(&packet_header, sizeof(packet_header), 1, wdh->fh);
if (nwritten != 1) {
if (nwritten == 0 && ferror(wdh->fh))
*err = errno;
else
*err = WTAP_ERR_SHORT_WRITE;
return FALSE;
}
nwritten = fwrite(pd, 1, phdr->caplen, wdh->fh);
if (nwritten != phdr->caplen) {
if (nwritten == 0 && ferror(wdh->fh))
*err = errno;
else
*err = WTAP_ERR_SHORT_WRITE;
return FALSE;
}
return TRUE;
}
/* just returns TRUE, there is no clean up needed */
static gboolean observer_dump_close(wtap_dumper *wdh _U_, int *err _U_)
{
return TRUE;
}
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