forked from osmocom/wireshark
90d7c5f59b
willing to read or that's bigger than will fit in the file format; instead, report an error. For the "I can't write a packet of that type in that file type" error, report the file type in question. svn path=/trunk/; revision=54882
501 lines
13 KiB
C
501 lines
13 KiB
C
/* eyesdn.c
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*
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* $Id$
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "wtap-int.h"
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#include "buffer.h"
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#include "eyesdn.h"
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#include "file_wrappers.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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/* This module reads the output of the EyeSDN USB S0/E1 ISDN probes
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* They store HDLC frames of D and B channels in a binary format
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* The fileformat is
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*
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* 1-6 Byte: EyeSDN - Magic
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* 7-n Byte: Frames
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*
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* Each Frame starts with the 0xff Flag byte
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* - Bytes 0-2: timestamp (usec in network byte order)
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* - Bytes 3-7: timestamp (40bits sec since 1970 in network byte order)
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* - Byte 8: channel (0 for D channel, 1-30 for B1-B30)
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* - Byte 9: Sender Bit 0(0 NT, 1 TE), Protocol in Bits 7:1, see enum
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* - Byte 10-11: frame size in bytes
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* - Byte 12-n: Frame Payload
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*
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* All multibyte values are represented in network byte order
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* The frame is terminated with a flag character (0xff)
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* bytes 0xff within a frame are escaped using the 0xfe escape character
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* the byte following the escape character is decremented by two:
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* so 0xfe 0xfd is actually a 0xff
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* Characters that need to be escaped are 0xff and 0xfe
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*/
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static int esc_read(guint8 *buf, int len, FILE_T fh)
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{
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int i;
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int value;
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for(i=0; i<len; i++) {
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value=file_getc(fh);
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if(value==-1)
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return -2; /* EOF or error */
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if(value==0xff)
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return -1; /* error !!, read into next frame */
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if(value==0xfe) {
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/* we need to escape */
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value=file_getc(fh);
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if(value==-1)
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return -2;
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value+=2;
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}
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buf[i]=value;
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}
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return i;
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}
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/* Magic text to check for eyesdn-ness of file */
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static const unsigned char eyesdn_hdr_magic[] =
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{ 'E', 'y', 'e', 'S', 'D', 'N'};
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#define EYESDN_HDR_MAGIC_SIZE (sizeof(eyesdn_hdr_magic) / sizeof(eyesdn_hdr_magic[0]))
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/* Size of a record header */
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#define EYESDN_HDR_LENGTH 12
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/*
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* XXX - is this the biggest packet we can get?
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*/
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#define EYESDN_MAX_PACKET_LEN 16384
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static gboolean eyesdn_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean eyesdn_seek_read(wtap *wth, gint64 seek_off,
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struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
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static int read_eyesdn_rec(FILE_T fh, struct wtap_pkthdr *phdr, Buffer* buf,
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int *err, gchar **err_info);
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/* Seeks to the beginning of the next packet, and returns the
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byte offset. Returns -1 on failure, and sets "*err" to the error
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and "*err_info" to null or an additional error string. */
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static gint64 eyesdn_seek_next_packet(wtap *wth, int *err, gchar **err_info)
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{
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int byte;
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gint64 cur_off;
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while ((byte = file_getc(wth->fh)) != EOF) {
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if (byte == 0xff) {
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cur_off = file_tell(wth->fh);
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if (cur_off == -1) {
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/* Error. */
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*err = file_error(wth->fh, err_info);
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return -1;
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}
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return cur_off;
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}
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}
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/* EOF or error. */
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*err = file_error(wth->fh, err_info);
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return -1;
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}
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int eyesdn_open(wtap *wth, int *err, gchar **err_info)
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{
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int bytes_read;
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char magic[EYESDN_HDR_MAGIC_SIZE];
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/* Look for eyesdn header */
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&magic, sizeof magic, wth->fh);
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if (bytes_read != sizeof magic) {
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*err = file_error(wth->fh, err_info);
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return -1;
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return 0;
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}
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if (memcmp(magic, eyesdn_hdr_magic, EYESDN_HDR_MAGIC_SIZE) != 0)
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return 0;
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wth->file_encap = WTAP_ENCAP_PER_PACKET;
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_EYESDN;
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wth->snapshot_length = 0; /* not known */
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wth->subtype_read = eyesdn_read;
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wth->subtype_seek_read = eyesdn_seek_read;
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wth->tsprecision = WTAP_FILE_TSPREC_USEC;
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return 1;
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}
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/* Find the next packet and parse it; called from wtap_read(). */
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static gboolean eyesdn_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset)
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{
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gint64 offset;
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/* Find the next record */
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offset = eyesdn_seek_next_packet(wth, err, err_info);
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if (offset < 1)
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return FALSE;
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*data_offset = offset;
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/* Parse the record */
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return read_eyesdn_rec(wth->fh, &wth->phdr, wth->frame_buffer,
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err, err_info);
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}
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/* Used to read packets in random-access fashion */
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static gboolean
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eyesdn_seek_read(wtap *wth, gint64 seek_off, struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info)
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{
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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return FALSE;
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return read_eyesdn_rec(wth->random_fh, phdr, buf, err, err_info);
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}
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/* Parses a record. */
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static gboolean
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read_eyesdn_rec(FILE_T fh, struct wtap_pkthdr *phdr, Buffer *buf, int *err,
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gchar **err_info)
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{
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union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
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guint8 hdr[EYESDN_HDR_LENGTH];
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time_t secs;
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int usecs;
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int pkt_len;
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guint8 channel, direction;
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int bytes_read;
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guint8 *pd;
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/* Our file pointer should be at the summary information header
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* for a packet. Read in that header and extract the useful
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* information.
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*/
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if (esc_read(hdr, EYESDN_HDR_LENGTH, fh) != EYESDN_HDR_LENGTH) {
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*err = file_error(fh, err_info);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return FALSE;
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}
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/* extract information from header */
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usecs = pntoh24(&hdr[0]);
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#ifdef TV64BITS
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secs = hdr[3];
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#else
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secs = 0;
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#endif
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secs = (secs << 8) | hdr[4];
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secs = (secs << 8) | hdr[5];
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secs = (secs << 8) | hdr[6];
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secs = (secs << 8) | hdr[7];
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channel = hdr[8];
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direction = hdr[9];
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pkt_len = pntoh16(&hdr[10]);
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switch(direction >> 1) {
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default:
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case EYESDN_ENCAP_ISDN: /* ISDN */
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pseudo_header->isdn.uton = direction & 1;
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pseudo_header->isdn.channel = channel;
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if(channel) { /* bearer channels */
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phdr->pkt_encap = WTAP_ENCAP_ISDN; /* recognises PPP */
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pseudo_header->isdn.uton=!pseudo_header->isdn.uton; /* bug */
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} else { /* D channel */
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phdr->pkt_encap = WTAP_ENCAP_ISDN;
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}
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break;
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case EYESDN_ENCAP_MSG: /* Layer 1 message */
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phdr->pkt_encap = WTAP_ENCAP_LAYER1_EVENT;
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pseudo_header->l1event.uton = (direction & 1);
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break;
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case EYESDN_ENCAP_LAPB: /* X.25 via LAPB */
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phdr->pkt_encap = WTAP_ENCAP_LAPB;
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pseudo_header->x25.flags = (direction & 1) ? 0 : 0x80;
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break;
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case EYESDN_ENCAP_ATM: { /* ATM cells */
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#define CELL_LEN 53
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unsigned char cell[CELL_LEN];
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gint64 cur_off;
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if(pkt_len != CELL_LEN) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf(
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"eyesdn: ATM cell has a length != 53 (%u)",
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pkt_len);
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return FALSE;
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}
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cur_off = file_tell(fh);
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if (esc_read(cell, CELL_LEN, fh) != CELL_LEN) {
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*err = file_error(fh, err_info);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return FALSE;
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}
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if (file_seek(fh, cur_off, SEEK_SET, err) == -1)
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return FALSE;
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phdr->pkt_encap = WTAP_ENCAP_ATM_PDUS_UNTRUNCATED;
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pseudo_header->atm.flags=ATM_RAW_CELL;
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pseudo_header->atm.aal=AAL_UNKNOWN;
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pseudo_header->atm.type=TRAF_UMTS_FP;
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pseudo_header->atm.subtype=TRAF_ST_UNKNOWN;
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pseudo_header->atm.vpi=((cell[0]&0xf)<<4) + (cell[0]&0xf);
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pseudo_header->atm.vci=((cell[0]&0xf)<<4) + cell[0]; /* from cell */
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pseudo_header->atm.channel=direction & 1;
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}
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break;
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case EYESDN_ENCAP_MTP2: /* SS7 frames */
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pseudo_header->mtp2.sent = direction & 1;
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pseudo_header->mtp2.annex_a_used = MTP2_ANNEX_A_USED_UNKNOWN;
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pseudo_header->mtp2.link_number = channel;
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phdr->pkt_encap = WTAP_ENCAP_MTP2_WITH_PHDR;
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break;
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case EYESDN_ENCAP_DPNSS: /* DPNSS */
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pseudo_header->isdn.uton = direction & 1;
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pseudo_header->isdn.channel = channel;
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phdr->pkt_encap = WTAP_ENCAP_DPNSS;
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break;
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case EYESDN_ENCAP_DASS2: /* DASS2 frames */
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pseudo_header->isdn.uton = direction & 1;
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pseudo_header->isdn.channel = channel;
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phdr->pkt_encap = WTAP_ENCAP_DPNSS;
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break;
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case EYESDN_ENCAP_BACNET: /* BACNET async over HDLC frames */
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pseudo_header->isdn.uton = direction & 1;
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pseudo_header->isdn.channel = channel;
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phdr->pkt_encap = WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR;
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break;
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case EYESDN_ENCAP_V5_EF: /* V5EF */
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pseudo_header->isdn.uton = direction & 1;
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pseudo_header->isdn.channel = channel;
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phdr->pkt_encap = WTAP_ENCAP_V5_EF;
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break;
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}
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if(pkt_len > EYESDN_MAX_PACKET_LEN) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("eyesdn: File has %u-byte packet, bigger than maximum of %u",
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pkt_len, EYESDN_MAX_PACKET_LEN);
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return FALSE;
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}
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phdr->presence_flags = WTAP_HAS_TS;
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phdr->ts.secs = secs;
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phdr->ts.nsecs = usecs * 1000;
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phdr->caplen = pkt_len;
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phdr->len = pkt_len;
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/* Make sure we have enough room for the packet */
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buffer_assure_space(buf, EYESDN_MAX_PACKET_LEN);
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errno = WTAP_ERR_CANT_READ;
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pd = buffer_start_ptr(buf);
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bytes_read = esc_read(pd, pkt_len, fh);
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if (bytes_read != pkt_len) {
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if (bytes_read == -2) {
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*err = file_error(fh, err_info);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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} else if (bytes_read == -1) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("eyesdn: No flag character seen in frame");
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} else
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*err = WTAP_ERR_SHORT_READ;
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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esc_write(wtap_dumper *wdh, const guint8 *buf, int len, int *err)
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{
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int i;
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guint8 byte;
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static const guint8 esc = 0xfe;
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for(i=0; i<len; i++) {
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byte=buf[i];
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if(byte == 0xff || byte == 0xfe) {
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/*
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* Escape the frame delimiter and escape byte.
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*/
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if (!wtap_dump_file_write(wdh, &esc, sizeof esc, err))
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return FALSE;
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byte-=2;
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}
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if (!wtap_dump_file_write(wdh, &byte, sizeof byte, err))
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return FALSE;
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}
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return TRUE;
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}
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static gboolean eyesdn_dump(wtap_dumper *wdh,
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const struct wtap_pkthdr *phdr,
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const guint8 *pd, int *err);
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gboolean eyesdn_dump_open(wtap_dumper *wdh, int *err)
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{
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wdh->subtype_write=eyesdn_dump;
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wdh->subtype_close=NULL;
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if (!wtap_dump_file_write(wdh, eyesdn_hdr_magic,
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EYESDN_HDR_MAGIC_SIZE, err))
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return FALSE;
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wdh->bytes_dumped += EYESDN_HDR_MAGIC_SIZE;
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*err=0;
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return TRUE;
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}
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int eyesdn_dump_can_write_encap(int encap)
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{
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switch (encap) {
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case WTAP_ENCAP_ISDN:
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case WTAP_ENCAP_LAYER1_EVENT:
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case WTAP_ENCAP_DPNSS:
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case WTAP_ENCAP_ATM_PDUS_UNTRUNCATED:
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case WTAP_ENCAP_LAPB:
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case WTAP_ENCAP_MTP2_WITH_PHDR:
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case WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR:
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case WTAP_ENCAP_PER_PACKET:
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return 0;
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default:
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return WTAP_ERR_UNSUPPORTED_ENCAP;
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}
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}
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/* Write a record for a packet to a dump file.
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* Returns TRUE on success, FALSE on failure. */
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static gboolean eyesdn_dump(wtap_dumper *wdh,
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const struct wtap_pkthdr *phdr,
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const guint8 *pd, int *err)
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{
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static const guint8 start_flag = 0xff;
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const union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
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guint8 buf[EYESDN_HDR_LENGTH];
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int usecs;
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time_t secs;
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int channel;
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int origin;
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int protocol;
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int size;
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/* Don't write out anything bigger than we can read.
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* (The length field in packet headers is 16 bits, which
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* imposes a hard limit.) */
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if (phdr->caplen > 65535) {
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*err = WTAP_ERR_PACKET_TOO_LARGE;
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return FALSE;
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}
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usecs=phdr->ts.nsecs/1000;
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secs=phdr->ts.secs;
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size=phdr->caplen;
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origin = pseudo_header->isdn.uton;
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channel = pseudo_header->isdn.channel;
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switch(phdr->pkt_encap) {
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case WTAP_ENCAP_ISDN:
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protocol=EYESDN_ENCAP_ISDN; /* set depending on decoder format and mode */
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break;
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case WTAP_ENCAP_LAYER1_EVENT:
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protocol=EYESDN_ENCAP_MSG;
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break;
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case WTAP_ENCAP_DPNSS:
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protocol=EYESDN_ENCAP_DPNSS;
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break;
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#if 0
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case WTAP_ENCAP_DASS2:
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protocol=EYESDN_ENCAP_DASS2;
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break;
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#endif
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case WTAP_ENCAP_ATM_PDUS_UNTRUNCATED:
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protocol=EYESDN_ENCAP_ATM;
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channel=0x80;
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break;
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case WTAP_ENCAP_LAPB:
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protocol=EYESDN_ENCAP_LAPB;
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break;
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case WTAP_ENCAP_MTP2_WITH_PHDR:
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protocol=EYESDN_ENCAP_MTP2;
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break;
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case WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR:
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protocol=EYESDN_ENCAP_BACNET;
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break;
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case WTAP_ENCAP_V5_EF:
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protocol=EYESDN_ENCAP_V5_EF;
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break;
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default:
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*err=WTAP_ERR_UNSUPPORTED_ENCAP;
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return FALSE;
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}
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phton24(&buf[0], usecs);
|
|
|
|
buf[3] = (guint8)0;
|
|
buf[4] = (guint8)(0xff & (secs >> 24));
|
|
buf[5] = (guint8)(0xff & (secs >> 16));
|
|
buf[6] = (guint8)(0xff & (secs >> 8));
|
|
buf[7] = (guint8)(0xff & (secs >> 0));
|
|
|
|
buf[8] = (guint8) channel;
|
|
buf[9] = (guint8) (origin?1:0) + (protocol << 1);
|
|
phtons(&buf[10], size);
|
|
|
|
/* start flag */
|
|
if (!wtap_dump_file_write(wdh, &start_flag, sizeof start_flag, err))
|
|
return FALSE;
|
|
if (!esc_write(wdh, buf, 12, err))
|
|
return FALSE;
|
|
if (!esc_write(wdh, pd, size, err))
|
|
return FALSE;
|
|
return TRUE;
|
|
}
|