4 * Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #include <wsutil/buffer.h>
25 #include "file_wrappers.h"
32 /* This module reads the output of the EyeSDN USB S0/E1 ISDN probes
33 * They store HDLC frames of D and B channels in a binary format
36 * 1-6 Byte: EyeSDN - Magic
39 * Each Frame starts with the 0xff Flag byte
40 * - Bytes 0-2: timestamp (usec in network byte order)
41 * - Bytes 3-7: timestamp (40bits sec since 1970 in network byte order)
42 * - Byte 8: channel (0 for D channel, 1-30 for B1-B30)
43 * - Byte 9: Sender Bit 0(0 NT, 1 TE), Protocol in Bits 7:1, see enum
44 * - Byte 10-11: frame size in bytes
45 * - Byte 12-n: Frame Payload
47 * All multibyte values are represented in network byte order
48 * The frame is terminated with a flag character (0xff)
49 * bytes 0xff within a frame are escaped using the 0xfe escape character
50 * the byte following the escape character is decremented by two:
51 * so 0xfe 0xfd is actually a 0xff
52 * Characters that need to be escaped are 0xff and 0xfe
56 static gboolean esc_read(FILE_T fh, guint8 *buf, int len, int *err, gchar **err_info)
61 for(i=0; i<len; i++) {
65 *err=file_error(fh, err_info);
67 *err=WTAP_ERR_SHORT_READ;
71 /* error !!, read into next frame */
72 *err=WTAP_ERR_BAD_FILE;
73 *err_info=g_strdup("eyesdn: No flag character seen in frame");
77 /* we need to escape */
81 *err=file_error(fh, err_info);
83 *err=WTAP_ERR_SHORT_READ;
94 /* Magic text to check for eyesdn-ness of file */
95 static const unsigned char eyesdn_hdr_magic[] =
96 { 'E', 'y', 'e', 'S', 'D', 'N'};
97 #define EYESDN_HDR_MAGIC_SIZE (sizeof(eyesdn_hdr_magic) / sizeof(eyesdn_hdr_magic[0]))
99 /* Size of a record header */
100 #define EYESDN_HDR_LENGTH 12
103 * XXX - is this the biggest packet we can get?
105 #define EYESDN_MAX_PACKET_LEN 16384
107 static gboolean eyesdn_read(wtap *wth, int *err, gchar **err_info,
108 gint64 *data_offset);
109 static gboolean eyesdn_seek_read(wtap *wth, gint64 seek_off,
110 struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
111 static int read_eyesdn_rec(FILE_T fh, struct wtap_pkthdr *phdr, Buffer* buf,
112 int *err, gchar **err_info);
114 /* Seeks to the beginning of the next packet, and returns the
115 byte offset. Returns -1 on failure, and sets "*err" to the error
116 and "*err_info" to null or an additional error string. */
117 static gint64 eyesdn_seek_next_packet(wtap *wth, int *err, gchar **err_info)
122 while ((byte = file_getc(wth->fh)) != EOF) {
124 cur_off = file_tell(wth->fh);
127 *err = file_error(wth->fh, err_info);
134 *err = file_error(wth->fh, err_info);
138 wtap_open_return_val eyesdn_open(wtap *wth, int *err, gchar **err_info)
140 char magic[EYESDN_HDR_MAGIC_SIZE];
142 /* Look for eyesdn header */
143 if (!wtap_read_bytes(wth->fh, &magic, sizeof magic, err, err_info)) {
144 if (*err != WTAP_ERR_SHORT_READ)
145 return WTAP_OPEN_ERROR;
146 return WTAP_OPEN_NOT_MINE;
148 if (memcmp(magic, eyesdn_hdr_magic, EYESDN_HDR_MAGIC_SIZE) != 0)
149 return WTAP_OPEN_NOT_MINE;
151 wth->file_encap = WTAP_ENCAP_PER_PACKET;
152 wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_EYESDN;
153 wth->snapshot_length = 0; /* not known */
154 wth->subtype_read = eyesdn_read;
155 wth->subtype_seek_read = eyesdn_seek_read;
156 wth->file_tsprec = WTAP_TSPREC_USEC;
158 return WTAP_OPEN_MINE;
161 /* Find the next packet and parse it; called from wtap_read(). */
162 static gboolean eyesdn_read(wtap *wth, int *err, gchar **err_info,
167 /* Find the next record */
168 offset = eyesdn_seek_next_packet(wth, err, err_info);
171 *data_offset = offset;
173 /* Parse the record */
174 return read_eyesdn_rec(wth->fh, &wth->phdr, wth->frame_buffer,
178 /* Used to read packets in random-access fashion */
180 eyesdn_seek_read(wtap *wth, gint64 seek_off, struct wtap_pkthdr *phdr,
181 Buffer *buf, int *err, gchar **err_info)
183 if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
186 return read_eyesdn_rec(wth->random_fh, phdr, buf, err, err_info);
189 /* Parses a record. */
191 read_eyesdn_rec(FILE_T fh, struct wtap_pkthdr *phdr, Buffer *buf, int *err,
194 union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
195 guint8 hdr[EYESDN_HDR_LENGTH];
199 guint8 channel, direction;
202 /* Our file pointer should be at the summary information header
203 * for a packet. Read in that header and extract the useful
206 if (!esc_read(fh, hdr, EYESDN_HDR_LENGTH, err, err_info))
209 /* extract information from header */
210 usecs = pntoh24(&hdr[0]);
216 secs = (secs << 8) | hdr[4];
217 secs = (secs << 8) | hdr[5];
218 secs = (secs << 8) | hdr[6];
219 secs = (secs << 8) | hdr[7];
223 pkt_len = pntoh16(&hdr[10]);
225 switch(direction >> 1) {
228 case EYESDN_ENCAP_ISDN: /* ISDN */
229 pseudo_header->isdn.uton = direction & 1;
230 pseudo_header->isdn.channel = channel;
231 if(channel) { /* bearer channels */
232 phdr->pkt_encap = WTAP_ENCAP_ISDN; /* recognises PPP */
233 pseudo_header->isdn.uton=!pseudo_header->isdn.uton; /* bug */
234 } else { /* D channel */
235 phdr->pkt_encap = WTAP_ENCAP_ISDN;
239 case EYESDN_ENCAP_MSG: /* Layer 1 message */
240 phdr->pkt_encap = WTAP_ENCAP_LAYER1_EVENT;
241 pseudo_header->l1event.uton = (direction & 1);
244 case EYESDN_ENCAP_LAPB: /* X.25 via LAPB */
245 phdr->pkt_encap = WTAP_ENCAP_LAPB;
246 pseudo_header->x25.flags = (direction & 1) ? 0 : 0x80;
249 case EYESDN_ENCAP_ATM: { /* ATM cells */
251 unsigned char cell[CELL_LEN];
254 if(pkt_len != CELL_LEN) {
255 *err = WTAP_ERR_BAD_FILE;
256 *err_info = g_strdup_printf(
257 "eyesdn: ATM cell has a length != 53 (%u)",
262 cur_off = file_tell(fh);
263 if (!esc_read(fh, cell, CELL_LEN, err, err_info))
265 if (file_seek(fh, cur_off, SEEK_SET, err) == -1)
267 phdr->pkt_encap = WTAP_ENCAP_ATM_PDUS_UNTRUNCATED;
268 pseudo_header->atm.flags=ATM_RAW_CELL;
269 pseudo_header->atm.aal=AAL_UNKNOWN;
270 pseudo_header->atm.type=TRAF_UMTS_FP;
271 pseudo_header->atm.subtype=TRAF_ST_UNKNOWN;
272 pseudo_header->atm.vpi=((cell[0]&0xf)<<4) + (cell[0]&0xf);
273 pseudo_header->atm.vci=((cell[0]&0xf)<<4) + cell[0]; /* from cell */
274 pseudo_header->atm.channel=direction & 1;
278 case EYESDN_ENCAP_MTP2: /* SS7 frames */
279 pseudo_header->mtp2.sent = direction & 1;
280 pseudo_header->mtp2.annex_a_used = MTP2_ANNEX_A_USED_UNKNOWN;
281 pseudo_header->mtp2.link_number = channel;
282 phdr->pkt_encap = WTAP_ENCAP_MTP2_WITH_PHDR;
285 case EYESDN_ENCAP_DPNSS: /* DPNSS */
286 pseudo_header->isdn.uton = direction & 1;
287 pseudo_header->isdn.channel = channel;
288 phdr->pkt_encap = WTAP_ENCAP_DPNSS;
291 case EYESDN_ENCAP_DASS2: /* DASS2 frames */
292 pseudo_header->isdn.uton = direction & 1;
293 pseudo_header->isdn.channel = channel;
294 phdr->pkt_encap = WTAP_ENCAP_DPNSS;
297 case EYESDN_ENCAP_BACNET: /* BACNET async over HDLC frames */
298 pseudo_header->isdn.uton = direction & 1;
299 pseudo_header->isdn.channel = channel;
300 phdr->pkt_encap = WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR;
303 case EYESDN_ENCAP_V5_EF: /* V5EF */
304 pseudo_header->isdn.uton = direction & 1;
305 pseudo_header->isdn.channel = channel;
306 phdr->pkt_encap = WTAP_ENCAP_V5_EF;
310 if(pkt_len > EYESDN_MAX_PACKET_LEN) {
311 *err = WTAP_ERR_BAD_FILE;
312 *err_info = g_strdup_printf("eyesdn: File has %u-byte packet, bigger than maximum of %u",
313 pkt_len, EYESDN_MAX_PACKET_LEN);
317 phdr->rec_type = REC_TYPE_PACKET;
318 phdr->presence_flags = WTAP_HAS_TS;
319 phdr->ts.secs = secs;
320 phdr->ts.nsecs = usecs * 1000;
321 phdr->caplen = pkt_len;
324 /* Make sure we have enough room for the packet */
325 ws_buffer_assure_space(buf, EYESDN_MAX_PACKET_LEN);
327 pd = ws_buffer_start_ptr(buf);
328 if (!esc_read(fh, pd, pkt_len, err, err_info))
335 esc_write(wtap_dumper *wdh, const guint8 *buf, int len, int *err)
339 static const guint8 esc = 0xfe;
341 for(i=0; i<len; i++) {
343 if(byte == 0xff || byte == 0xfe) {
345 * Escape the frame delimiter and escape byte.
347 if (!wtap_dump_file_write(wdh, &esc, sizeof esc, err))
351 if (!wtap_dump_file_write(wdh, &byte, sizeof byte, err))
357 static gboolean eyesdn_dump(wtap_dumper *wdh,
358 const struct wtap_pkthdr *phdr,
359 const guint8 *pd, int *err, gchar **err_info);
361 gboolean eyesdn_dump_open(wtap_dumper *wdh, int *err)
363 wdh->subtype_write=eyesdn_dump;
364 wdh->subtype_close=NULL;
366 if (!wtap_dump_file_write(wdh, eyesdn_hdr_magic,
367 EYESDN_HDR_MAGIC_SIZE, err))
369 wdh->bytes_dumped += EYESDN_HDR_MAGIC_SIZE;
374 int eyesdn_dump_can_write_encap(int encap)
377 case WTAP_ENCAP_ISDN:
378 case WTAP_ENCAP_LAYER1_EVENT:
379 case WTAP_ENCAP_DPNSS:
380 case WTAP_ENCAP_ATM_PDUS_UNTRUNCATED:
381 case WTAP_ENCAP_LAPB:
382 case WTAP_ENCAP_MTP2_WITH_PHDR:
383 case WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR:
384 case WTAP_ENCAP_PER_PACKET:
388 return WTAP_ERR_UNWRITABLE_ENCAP;
392 /* Write a record for a packet to a dump file.
393 * Returns TRUE on success, FALSE on failure. */
394 static gboolean eyesdn_dump(wtap_dumper *wdh,
395 const struct wtap_pkthdr *phdr,
396 const guint8 *pd, int *err, gchar **err_info _U_)
398 static const guint8 start_flag = 0xff;
399 const union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
400 guint8 buf[EYESDN_HDR_LENGTH];
408 /* We can only write packet records. */
409 if (phdr->rec_type != REC_TYPE_PACKET) {
410 *err = WTAP_ERR_UNWRITABLE_REC_TYPE;
414 /* Don't write out anything bigger than we can read.
415 * (The length field in packet headers is 16 bits, which
416 * imposes a hard limit.) */
417 if (phdr->caplen > 65535) {
418 *err = WTAP_ERR_PACKET_TOO_LARGE;
422 usecs=phdr->ts.nsecs/1000;
425 origin = pseudo_header->isdn.uton;
426 channel = pseudo_header->isdn.channel;
428 switch(phdr->pkt_encap) {
430 case WTAP_ENCAP_ISDN:
431 protocol=EYESDN_ENCAP_ISDN; /* set depending on decoder format and mode */
434 case WTAP_ENCAP_LAYER1_EVENT:
435 protocol=EYESDN_ENCAP_MSG;
438 case WTAP_ENCAP_DPNSS:
439 protocol=EYESDN_ENCAP_DPNSS;
443 case WTAP_ENCAP_DASS2:
444 protocol=EYESDN_ENCAP_DASS2;
448 case WTAP_ENCAP_ATM_PDUS_UNTRUNCATED:
449 protocol=EYESDN_ENCAP_ATM;
453 case WTAP_ENCAP_LAPB:
454 protocol=EYESDN_ENCAP_LAPB;
457 case WTAP_ENCAP_MTP2_WITH_PHDR:
458 protocol=EYESDN_ENCAP_MTP2;
461 case WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR:
462 protocol=EYESDN_ENCAP_BACNET;
465 case WTAP_ENCAP_V5_EF:
466 protocol=EYESDN_ENCAP_V5_EF;
470 *err=WTAP_ERR_UNWRITABLE_ENCAP;
474 phton24(&buf[0], usecs);
477 buf[4] = (guint8)(0xff & (secs >> 24));
478 buf[5] = (guint8)(0xff & (secs >> 16));
479 buf[6] = (guint8)(0xff & (secs >> 8));
480 buf[7] = (guint8)(0xff & (secs >> 0));
482 buf[8] = (guint8) channel;
483 buf[9] = (guint8) (origin?1:0) + (protocol << 1);
484 phtons(&buf[10], size);
487 if (!wtap_dump_file_write(wdh, &start_flag, sizeof start_flag, err))
489 if (!esc_write(wdh, buf, 12, err))
491 if (!esc_write(wdh, pd, size, err))