osmith
/
wireshark
forked from osmocom/wireshark
1
0
Fork 0
Code Pull Requests Releases Wiki Activity
wireshark/wiretap/iptrace.c

610 lines
17 KiB
C
Raw Blame History

/* iptrace.c
*
* $Id$
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
*
* 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.
*
*/
#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 "atm.h"
#include "iptrace.h"
static gboolean iptrace_read_1_0(wtap *wth, int *err, gchar **err_info,
long *data_offset);
static gboolean iptrace_seek_read_1_0(wtap *wth, long seek_off,
union wtap_pseudo_header *pseudo_header, guchar *pd, int packet_size,
int *err, gchar **err_info);
static gboolean iptrace_read_2_0(wtap *wth, int *err, gchar **err_info,
long *data_offset);
static gboolean iptrace_seek_read_2_0(wtap *wth, long seek_off,
union wtap_pseudo_header *pseudo_header, guchar *pd, int packet_size,
int *err, gchar **err_info);
static int iptrace_read_rec_header(FILE_T fh, guint8 *header, int header_len,
int *err);
static gboolean iptrace_read_rec_data(FILE_T fh, guint8 *data_ptr,
int packet_size, int *err);
static void fill_in_pseudo_header(int encap, const guint8 *pd, guint32 len,
union wtap_pseudo_header *pseudo_header, guint8 *header);
static int wtap_encap_ift(unsigned int ift);
int iptrace_open(wtap *wth, int *err, gchar **err_info _U_)
{
int bytes_read;
char name[12];
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(name, 1, 11, wth->fh);
if (bytes_read != 11) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
return 0;
}
wth->data_offset += 11;
name[11] = 0;
if (strcmp(name, "iptrace 1.0") == 0) {
wth->file_type = WTAP_FILE_IPTRACE_1_0;
wth->subtype_read = iptrace_read_1_0;
wth->subtype_seek_read = iptrace_seek_read_1_0;
}
else if (strcmp(name, "iptrace 2.0") == 0) {
wth->file_type = WTAP_FILE_IPTRACE_2_0;
wth->subtype_read = iptrace_read_2_0;
wth->subtype_seek_read = iptrace_seek_read_2_0;
}
else {
return 0;
}
return 1;
}
/***********************************************************
* iptrace 1.0 *
***********************************************************/
/*
* iptrace 1.0, discovered through inspection
*
* Packet record contains:
*
* an initial header, with a length field and a time stamp, in
* seconds since the Epoch;
*
* data, with the specified length.
*
* The data contains:
*
* a bunch of information about the packet;
*
* padding, at least for FDDI;
*
* the raw packet data.
*/
typedef struct {
/* 0-3 */ guint32 pkt_length; /* packet length + 0x16 */
/* 4-7 */ guint32 tv_sec; /* time stamp, seconds since the Epoch */
/* 8-11 */ guint32 junk1; /* ???, not time */
/* 12-15 */ char if_name[4]; /* null-terminated */
/* 16-27 */ char junk2[12]; /* ??? */
/* 28 */ guint8 if_type; /* BSD net/if_types.h */
/* 29 */ guint8 tx_flag; /* 0=receive, 1=transmit */
} iptrace_1_0_phdr;
#define IPTRACE_1_0_PHDR_SIZE 30 /* initial header plus packet data */
#define IPTRACE_1_0_PDATA_SIZE 22 /* packet data */
/* Read the next packet */
static gboolean iptrace_read_1_0(wtap *wth, int *err, gchar **err_info _U_,
long *data_offset)
{
int ret;
guint32 packet_size;
guint8 header[IPTRACE_1_0_PHDR_SIZE];
guint8 *data_ptr;
iptrace_1_0_phdr pkt_hdr;
guchar fddi_padding[3];
/* Read the descriptor data */
*data_offset = wth->data_offset;
ret = iptrace_read_rec_header(wth->fh, header, IPTRACE_1_0_PHDR_SIZE,
err);
if (ret <= 0) {
/* Read error or EOF */
return FALSE;
}
wth->data_offset += IPTRACE_1_0_PHDR_SIZE;
/*
* Byte 28 of the frame header appears to be a BSD-style IFT_xxx
* value giving the type of the interface. Check out the
* <net/if_types.h> header file.
*/
pkt_hdr.if_type = header[28];
wth->phdr.pkt_encap = wtap_encap_ift(pkt_hdr.if_type);
/* Read the packet data */
packet_size = pntohl(&header[0]) - IPTRACE_1_0_PDATA_SIZE;
/*
* AIX appears to put 3 bytes of padding in front of FDDI
* frames; strip that crap off.
*/
if (wth->phdr.pkt_encap == WTAP_ENCAP_FDDI_BITSWAPPED) {
/*
* The packet size is really a record size and includes
* the padding.
*/
packet_size -= 3;
wth->data_offset += 3;
/*
* Read the padding.
*/
if (!iptrace_read_rec_data(wth->fh, fddi_padding, 3, err))
return FALSE; /* Read error */
}
buffer_assure_space( wth->frame_buffer, packet_size );
data_ptr = buffer_start_ptr( wth->frame_buffer );
if (!iptrace_read_rec_data(wth->fh, data_ptr, packet_size, err))
return FALSE; /* Read error */
wth->data_offset += packet_size;
wth->phdr.len = packet_size;
wth->phdr.caplen = packet_size;
wth->phdr.ts.secs = pntohl(&header[4]);
wth->phdr.ts.nsecs = 0;
if (wth->phdr.pkt_encap == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
*err_info = g_strdup_printf("iptrace: interface type IFT=0x%02x unknown or unsupported",
pkt_hdr.if_type);
return FALSE;
}
/* Fill in the pseudo-header. */
fill_in_pseudo_header(wth->phdr.pkt_encap, data_ptr, wth->phdr.caplen,
&wth->pseudo_header, header);
/* If the per-file encapsulation isn't known, set it to this
packet's encapsulation.
If it *is* known, and it isn't this packet's encapsulation,
set it to WTAP_ENCAP_PER_PACKET, as this file doesn't
have a single encapsulation for all packets in the file. */
if (wth->file_encap == WTAP_ENCAP_UNKNOWN)
wth->file_encap = wth->phdr.pkt_encap;
else {
if (wth->file_encap != wth->phdr.pkt_encap)
wth->file_encap = WTAP_ENCAP_PER_PACKET;
}
return TRUE;
}
static gboolean iptrace_seek_read_1_0(wtap *wth, long seek_off,
union wtap_pseudo_header *pseudo_header, guchar *pd, int packet_size,
int *err, gchar **err_info _U_)
{
int ret;
guint8 header[IPTRACE_1_0_PHDR_SIZE];
int pkt_encap;
guchar fddi_padding[3];
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
return FALSE;
/* Read the descriptor data */
ret = iptrace_read_rec_header(wth->random_fh, header,
IPTRACE_1_0_PHDR_SIZE, err);
if (ret <= 0) {
/* Read error or EOF */
if (ret == 0) {
/* EOF means "short read" in random-access mode */
*err = WTAP_ERR_SHORT_READ;
}
return FALSE;
}
/*
* Get the interface type.
*/
pkt_encap = wtap_encap_ift(header[28]);
/*
* AIX appears to put 3 bytes of padding in front of FDDI
* frames; strip that crap off.
*/
if (pkt_encap == WTAP_ENCAP_FDDI_BITSWAPPED) {
/*
* Read the padding.
*/
if (!iptrace_read_rec_data(wth->random_fh, fddi_padding, 3, err))
return FALSE; /* Read error */
}
/* Get the packet data */
if (!iptrace_read_rec_data(wth->random_fh, pd, packet_size, err))
return FALSE;
/* Fill in the pseudo_header. */
fill_in_pseudo_header(pkt_encap, pd, packet_size, pseudo_header,
header);
return TRUE;
}
/***********************************************************
* iptrace 2.0 *
***********************************************************/
/*
* iptrace 2.0, discovered through inspection
*
* Packet record contains:
*
* an initial header, with a length field and a time stamp, in
* seconds since the Epoch;
*
* data, with the specified length.
*
* The data contains:
*
* a bunch of information about the packet;
*
* padding, at least for FDDI;
*
* the raw packet data.
*/
typedef struct {
/* 0-3 */ guint32 pkt_length; /* packet length + 32 */
/* 4-7 */ guint32 tv_sec0; /* time stamp, seconds since the Epoch */
/* 8-11 */ guint32 junk1; /* ?? */
/* 12-15 */ char if_name[4]; /* null-terminated */
/* 16-27 */ char if_desc[12]; /* interface description. */
/* 28 */ guint8 if_type; /* BSD net/if_types.h */
/* 29 */ guint8 tx_flag; /* 0=receive, 1=transmit */
/* 30-31 */ guint16 junk3;
/* 32-35 */ guint32 tv_sec; /* time stamp, seconds since the Epoch */
/* 36-39 */ guint32 tv_nsec; /* nanoseconds since that second */
} iptrace_2_0_phdr;
#define IPTRACE_2_0_PHDR_SIZE 40 /* initial header plus packet data */
#define IPTRACE_2_0_PDATA_SIZE 32 /* packet data */
/* Read the next packet */
static gboolean iptrace_read_2_0(wtap *wth, int *err, gchar **err_info _U_,
long *data_offset)
{
int ret;
guint32 packet_size;
guint8 header[IPTRACE_2_0_PHDR_SIZE];
guint8 *data_ptr;
iptrace_2_0_phdr pkt_hdr;
guchar fddi_padding[3];
/* Read the descriptor data */
*data_offset = wth->data_offset;
ret = iptrace_read_rec_header(wth->fh, header, IPTRACE_2_0_PHDR_SIZE,
err);
if (ret <= 0) {
/* Read error or EOF */
return FALSE;
}
wth->data_offset += IPTRACE_2_0_PHDR_SIZE;
/*
* Byte 28 of the frame header appears to be a BSD-style IFT_xxx
* value giving the type of the interface. Check out the
* <net/if_types.h> header file.
*/
pkt_hdr.if_type = header[28];
wth->phdr.pkt_encap = wtap_encap_ift(pkt_hdr.if_type);
/* Read the packet data */
packet_size = pntohl(&header[0]) - IPTRACE_2_0_PDATA_SIZE;
/*
* AIX appears to put 3 bytes of padding in front of FDDI
* frames; strip that crap off.
*/
if (wth->phdr.pkt_encap == WTAP_ENCAP_FDDI_BITSWAPPED) {
/*
* The packet size is really a record size and includes
* the padding.
*/
packet_size -= 3;
wth->data_offset += 3;
/*
* Read the padding.
*/
if (!iptrace_read_rec_data(wth->fh, fddi_padding, 3, err))
return FALSE; /* Read error */
}
buffer_assure_space( wth->frame_buffer, packet_size );
data_ptr = buffer_start_ptr( wth->frame_buffer );
if (!iptrace_read_rec_data(wth->fh, data_ptr, packet_size, err))
return FALSE; /* Read error */
wth->data_offset += packet_size;
/* AIX saves time in nsec, not usec. It's easier to make iptrace
* files more Unix-compliant here than try to get the calling
* program to know when to use nsec or usec */
wth->phdr.len = packet_size;
wth->phdr.caplen = packet_size;
wth->phdr.ts.secs = pntohl(&header[32]);
wth->phdr.ts.nsecs = pntohl(&header[36]);
if (wth->phdr.pkt_encap == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
*err_info = g_strdup_printf("iptrace: interface type IFT=0x%02x unknown or unsupported",
pkt_hdr.if_type);
return FALSE;
}
/* Fill in the pseudo-header. */
fill_in_pseudo_header(wth->phdr.pkt_encap, data_ptr, wth->phdr.caplen,
&wth->pseudo_header, header);
/* If the per-file encapsulation isn't known, set it to this
packet's encapsulation.
If it *is* known, and it isn't this packet's encapsulation,
set it to WTAP_ENCAP_PER_PACKET, as this file doesn't
have a single encapsulation for all packets in the file. */
if (wth->file_encap == WTAP_ENCAP_UNKNOWN)
wth->file_encap = wth->phdr.pkt_encap;
else {
if (wth->file_encap != wth->phdr.pkt_encap)
wth->file_encap = WTAP_ENCAP_PER_PACKET;
}
return TRUE;
}
static gboolean iptrace_seek_read_2_0(wtap *wth, long seek_off,
union wtap_pseudo_header *pseudo_header, guchar *pd, int packet_size,
int *err, gchar **err_info _U_)
{
int ret;
guint8 header[IPTRACE_2_0_PHDR_SIZE];
int pkt_encap;
guchar fddi_padding[3];
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
return FALSE;
/* Read the descriptor data */
ret = iptrace_read_rec_header(wth->random_fh, header,
IPTRACE_2_0_PHDR_SIZE, err);
if (ret <= 0) {
/* Read error or EOF */
if (ret == 0) {
/* EOF means "short read" in random-access mode */
*err = WTAP_ERR_SHORT_READ;
}
return FALSE;
}
/*
* Get the interface type.
*/
pkt_encap = wtap_encap_ift(header[28]);
/*
* AIX appears to put 3 bytes of padding in front of FDDI
* frames; strip that crap off.
*/
if (pkt_encap == WTAP_ENCAP_FDDI_BITSWAPPED) {
/*
* Read the padding.
*/
if (!iptrace_read_rec_data(wth->random_fh, fddi_padding, 3, err))
return FALSE; /* Read error */
}
/* Get the packet data */
if (!iptrace_read_rec_data(wth->random_fh, pd, packet_size, err))
return FALSE;
/* Fill in the pseudo-header. */
fill_in_pseudo_header(pkt_encap, pd, packet_size, pseudo_header,
header);
return TRUE;
}
static int
iptrace_read_rec_header(FILE_T fh, guint8 *header, int header_len, int *err)
{
int bytes_read;
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(header, 1, header_len, fh);
if (bytes_read != header_len) {
*err = file_error(fh);
if (*err != 0)
return -1;
if (bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
return 1;
}
static gboolean
iptrace_read_rec_data(FILE_T fh, guint8 *data_ptr, int packet_size, int *err)
{
int bytes_read;
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read( data_ptr, 1, packet_size, fh );
if (bytes_read != packet_size) {
*err = file_error(fh);
if (*err == 0)
*err = WTAP_ERR_SHORT_READ;
return FALSE;
}
return TRUE;
}
/*
* Fill in the pseudo-header information we can.
*
* For ATM traffic, "iptrace", alas, doesn't tell us what type of traffic
* is in the packet - it was presumably run on a machine that was one of
* the endpoints of the connection, so in theory it could presumably have
* told us, but, for whatever reason, it failed to do so - perhaps the
* low-level mechanism that feeds the presumably-AAL5 frames to us doesn't
* have access to that information (e.g., because it's in the ATM driver,
* and the ATM driver merely knows that stuff on VPI/VCI X.Y should be
* handed up to some particular client, it doesn't know what that client is).
*
* We let our caller try to figure out what kind of traffic it is, either
* by guessing based on the VPI/VCI, guessing based on the header of the
* packet, seeing earlier traffic that set up the circuit and specified
* in some fashion what sort of traffic it is, or being told by the user.
*/
static void
fill_in_pseudo_header(int encap, const guint8 *pd, guint32 len,
union wtap_pseudo_header *pseudo_header, guint8 *header)
{
char if_text[9];
char *decimal;
int Vpi = 0;
int Vci = 0;
switch (encap) {
case WTAP_ENCAP_ATM_PDUS:
/* Rip apart the "x.y" text into Vpi/Vci numbers */
memcpy(if_text, &header[20], 8);
if_text[8] = '\0';
decimal = strchr(if_text, '.');
if (decimal) {
*decimal = '\0';
Vpi = strtoul(if_text, NULL, 10);
decimal++;
Vci = strtoul(decimal, NULL, 10);
}
/*
* OK, which value means "DTE->DCE" and which value means
* "DCE->DTE"?
*/
pseudo_header->atm.channel = header[29];
pseudo_header->atm.vpi = Vpi;
pseudo_header->atm.vci = Vci;
/*
* Attempt to guess from the packet data, the VPI,
* and the VCI information about the type of traffic.
*/
atm_guess_traffic_type(pd, len, pseudo_header);
/* We don't have this information */
pseudo_header->atm.flags = 0;
pseudo_header->atm.cells = 0;
pseudo_header->atm.aal5t_u2u = 0;
pseudo_header->atm.aal5t_len = 0;
pseudo_header->atm.aal5t_chksum = 0;
break;
case WTAP_ENCAP_ETHERNET:
/* We assume there's no FCS in this frame. */
pseudo_header->eth.fcs_len = 0;
break;
}
}
/* Given an RFC1573 (SNMP ifType) interface type,
* return the appropriate Wiretap Encapsulation Type.
*/
static int
wtap_encap_ift(unsigned int ift)
{
static const int ift_encap[] = {
/* 0x0 */ WTAP_ENCAP_UNKNOWN, /* nothing */
/* 0x1 */ WTAP_ENCAP_UNKNOWN, /* IFT_OTHER */
/* 0x2 */ WTAP_ENCAP_UNKNOWN, /* IFT_1822 */
/* 0x3 */ WTAP_ENCAP_UNKNOWN, /* IFT_HDH1822 */
/* 0x4 */ WTAP_ENCAP_RAW_IP, /* IFT_X25DDN */
/* 0x5 */ WTAP_ENCAP_UNKNOWN, /* IFT_X25 */
/* 0x6 */ WTAP_ENCAP_ETHERNET, /* IFT_ETHER */
/* 0x7 */ WTAP_ENCAP_ETHERNET, /* IFT_ISO88023 */
/* 0x8 */ WTAP_ENCAP_UNKNOWN, /* IFT_ISO88024 */
/* 0x9 */ WTAP_ENCAP_TOKEN_RING, /* IFT_ISO88025 */
/* 0xa */ WTAP_ENCAP_UNKNOWN, /* IFT_ISO88026 */
/* 0xb */ WTAP_ENCAP_UNKNOWN, /* IFT_STARLAN */
/* 0xc */ WTAP_ENCAP_RAW_IP, /* IFT_P10, IBM SP switch */
/* 0xd */ WTAP_ENCAP_UNKNOWN, /* IFT_P80 */
/* 0xe */ WTAP_ENCAP_UNKNOWN, /* IFT_HY */
/* 0xf */ WTAP_ENCAP_FDDI_BITSWAPPED, /* IFT_FDDI */
/* 0x10 */ WTAP_ENCAP_LAPB, /* IFT_LAPB */ /* no data to back this up */
/* 0x11 */ WTAP_ENCAP_UNKNOWN, /* IFT_SDLC */
/* 0x12 */ WTAP_ENCAP_UNKNOWN, /* IFT_T1 */
/* 0x13 */ WTAP_ENCAP_UNKNOWN, /* IFT_CEPT */
/* 0x14 */ WTAP_ENCAP_UNKNOWN, /* IFT_ISDNBASIC */
/* 0x15 */ WTAP_ENCAP_UNKNOWN, /* IFT_ISDNPRIMARY */
/* 0x16 */ WTAP_ENCAP_UNKNOWN, /* IFT_PTPSERIAL */
/* 0x17 */ WTAP_ENCAP_UNKNOWN, /* IFT_PPP */
/* 0x18 */ WTAP_ENCAP_RAW_IP, /* IFT_LOOP */
/* 0x19 */ WTAP_ENCAP_UNKNOWN, /* IFT_EON */
/* 0x1a */ WTAP_ENCAP_UNKNOWN, /* IFT_XETHER */
/* 0x1b */ WTAP_ENCAP_UNKNOWN, /* IFT_NSIP */
/* 0x1c */ WTAP_ENCAP_UNKNOWN, /* IFT_SLIP */
/* 0x1d */ WTAP_ENCAP_UNKNOWN, /* IFT_ULTRA */
/* 0x1e */ WTAP_ENCAP_UNKNOWN, /* IFT_DS3 */
/* 0x1f */ WTAP_ENCAP_UNKNOWN, /* IFT_SIP */
/* 0x20 */ WTAP_ENCAP_UNKNOWN, /* IFT_FRELAY */
/* 0x21 */ WTAP_ENCAP_UNKNOWN, /* IFT_RS232 */
/* 0x22 */ WTAP_ENCAP_UNKNOWN, /* IFT_PARA */
/* 0x23 */ WTAP_ENCAP_UNKNOWN, /* IFT_ARCNET */
/* 0x24 */ WTAP_ENCAP_UNKNOWN, /* IFT_ARCNETPLUS */
/* 0x25 */ WTAP_ENCAP_ATM_PDUS, /* IFT_ATM */
};
#define NUM_IFT_ENCAPS (sizeof ift_encap / sizeof ift_encap[0])
if (ift < NUM_IFT_ENCAPS) {
return ift_encap[ift];
}
else {
return WTAP_ENCAP_UNKNOWN;
}
}
View Git Blame Copy Permalink