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.
24 #include "file_wrappers.h"
30 /* This module reads the output of the EyeSDN USB S0/E1 ISDN probes
31 * They store HDLC frames of D and B channels in a binary format
34 * 1-6 Byte: EyeSDN - Magic
37 * Each Frame starts with the 0xff Flag byte
38 * - Bytes 0-2: timestamp (usec in network byte order)
39 * - Bytes 3-7: timestamp (40bits sec since 1970 in network byte order)
40 * - Byte 8: channel (0 for D channel, 1-30 for B1-B30)
41 * - Byte 9: Sender Bit 0(0 NT, 1 TE), Protocol in Bits 7:1, see enum
42 * - Byte 10-11: frame size in bytes
43 * - Byte 12-n: Frame Payload
45 * All multibyte values are represented in network byte order
46 * The frame is terminated with a flag character (0xff)
47 * bytes 0xff within a frame are escaped using the 0xfe escape character
48 * the byte following the escape character is decremented by two:
49 * so 0xfe 0xfd is actually a 0xff
50 * Characters that need to be escaped are 0xff and 0xfe
54 static gboolean esc_read(FILE_T fh, guint8 *buf, int len, int *err, gchar **err_info)
59 for(i=0; i<len; i++) {
63 *err=file_error(fh, err_info);
65 *err=WTAP_ERR_SHORT_READ;
69 /* error !!, read into next frame */
70 *err=WTAP_ERR_BAD_FILE;
71 *err_info=g_strdup("eyesdn: No flag character seen in frame");
75 /* we need to escape */
79 *err=file_error(fh, err_info);
81 *err=WTAP_ERR_SHORT_READ;
92 /* Magic text to check for eyesdn-ness of file */
93 static const unsigned char eyesdn_hdr_magic[] =
94 { 'E', 'y', 'e', 'S', 'D', 'N'};
95 #define EYESDN_HDR_MAGIC_SIZE (sizeof(eyesdn_hdr_magic) / sizeof(eyesdn_hdr_magic[0]))
97 /* Size of a record header */
98 #define EYESDN_HDR_LENGTH 12
101 * XXX - is this the biggest packet we can get?
103 #define EYESDN_MAX_PACKET_LEN 16384
105 static gboolean eyesdn_read(wtap *wth, int *err, gchar **err_info,
106 gint64 *data_offset);
107 static gboolean eyesdn_seek_read(wtap *wth, gint64 seek_off,
108 struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
109 static int read_eyesdn_rec(FILE_T fh, struct wtap_pkthdr *phdr, Buffer* buf,
110 int *err, gchar **err_info);
112 /* Seeks to the beginning of the next packet, and returns the
113 byte offset. Returns -1 on failure, and sets "*err" to the error
114 and "*err_info" to null or an additional error string. */
115 static gint64 eyesdn_seek_next_packet(wtap *wth, int *err, gchar **err_info)
120 while ((byte = file_getc(wth->fh)) != EOF) {
122 cur_off = file_tell(wth->fh);
125 *err = file_error(wth->fh, err_info);
132 *err = file_error(wth->fh, err_info);
136 wtap_open_return_val eyesdn_open(wtap *wth, int *err, gchar **err_info)
138 char magic[EYESDN_HDR_MAGIC_SIZE];
140 /* Look for eyesdn header */
141 if (!wtap_read_bytes(wth->fh, &magic, sizeof magic, err, err_info)) {
142 if (*err != WTAP_ERR_SHORT_READ)
143 return WTAP_OPEN_ERROR;
144 return WTAP_OPEN_NOT_MINE;
146 if (memcmp(magic, eyesdn_hdr_magic, EYESDN_HDR_MAGIC_SIZE) != 0)
147 return WTAP_OPEN_NOT_MINE;
149 wth->file_encap = WTAP_ENCAP_PER_PACKET;
150 wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_EYESDN;
151 wth->snapshot_length = 0; /* not known */
152 wth->subtype_read = eyesdn_read;
153 wth->subtype_seek_read = eyesdn_seek_read;
154 wth->file_tsprec = WTAP_TSPREC_USEC;
156 return WTAP_OPEN_MINE;
159 /* Find the next packet and parse it; called from wtap_read(). */
160 static gboolean eyesdn_read(wtap *wth, int *err, gchar **err_info,
165 /* Find the next record */
166 offset = eyesdn_seek_next_packet(wth, err, err_info);
169 *data_offset = offset;
171 /* Parse the record */
172 return read_eyesdn_rec(wth->fh, &wth->phdr, wth->frame_buffer,
176 /* Used to read packets in random-access fashion */
178 eyesdn_seek_read(wtap *wth, gint64 seek_off, struct wtap_pkthdr *phdr,
179 Buffer *buf, int *err, gchar **err_info)
181 if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
184 return read_eyesdn_rec(wth->random_fh, phdr, buf, err, err_info);
187 /* Parses a record. */
189 read_eyesdn_rec(FILE_T fh, struct wtap_pkthdr *phdr, Buffer *buf, int *err,
192 union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
193 guint8 hdr[EYESDN_HDR_LENGTH];
197 guint8 channel, direction;
200 /* Our file pointer should be at the summary information header
201 * for a packet. Read in that header and extract the useful
204 if (!esc_read(fh, hdr, EYESDN_HDR_LENGTH, err, err_info))
207 /* extract information from header */
208 usecs = pntoh24(&hdr[0]);
214 secs = (secs << 8) | hdr[4];
215 secs = (secs << 8) | hdr[5];
216 secs = (secs << 8) | hdr[6];
217 secs = (secs << 8) | hdr[7];
221 pkt_len = pntoh16(&hdr[10]);
223 switch(direction >> 1) {
226 case EYESDN_ENCAP_ISDN: /* ISDN */
227 pseudo_header->isdn.uton = direction & 1;
228 pseudo_header->isdn.channel = channel;
229 if(channel) { /* bearer channels */
230 phdr->pkt_encap = WTAP_ENCAP_ISDN; /* recognises PPP */
231 pseudo_header->isdn.uton=!pseudo_header->isdn.uton; /* bug */
232 } else { /* D channel */
233 phdr->pkt_encap = WTAP_ENCAP_ISDN;
237 case EYESDN_ENCAP_MSG: /* Layer 1 message */
238 phdr->pkt_encap = WTAP_ENCAP_LAYER1_EVENT;
239 pseudo_header->l1event.uton = (direction & 1);
242 case EYESDN_ENCAP_LAPB: /* X.25 via LAPB */
243 phdr->pkt_encap = WTAP_ENCAP_LAPB;
244 pseudo_header->x25.flags = (direction & 1) ? 0 : 0x80;
247 case EYESDN_ENCAP_ATM: { /* ATM cells */
249 unsigned char cell[CELL_LEN];
252 if(pkt_len != CELL_LEN) {
253 *err = WTAP_ERR_BAD_FILE;
254 *err_info = g_strdup_printf(
255 "eyesdn: ATM cell has a length != 53 (%u)",
260 cur_off = file_tell(fh);
261 if (!esc_read(fh, cell, CELL_LEN, err, err_info))
263 if (file_seek(fh, cur_off, SEEK_SET, err) == -1)
265 phdr->pkt_encap = WTAP_ENCAP_ATM_PDUS_UNTRUNCATED;
266 pseudo_header->atm.flags=ATM_RAW_CELL;
267 pseudo_header->atm.aal=AAL_UNKNOWN;
268 pseudo_header->atm.type=TRAF_UMTS_FP;
269 pseudo_header->atm.subtype=TRAF_ST_UNKNOWN;
270 pseudo_header->atm.vpi=((cell[0]&0xf)<<4) + (cell[0]&0xf);
271 pseudo_header->atm.vci=((cell[0]&0xf)<<4) + cell[0]; /* from cell */
272 pseudo_header->atm.channel=direction & 1;
276 case EYESDN_ENCAP_MTP2: /* SS7 frames */
277 pseudo_header->mtp2.sent = direction & 1;
278 pseudo_header->mtp2.annex_a_used = MTP2_ANNEX_A_USED_UNKNOWN;
279 pseudo_header->mtp2.link_number = channel;
280 phdr->pkt_encap = WTAP_ENCAP_MTP2_WITH_PHDR;
283 case EYESDN_ENCAP_DPNSS: /* DPNSS */
284 pseudo_header->isdn.uton = direction & 1;
285 pseudo_header->isdn.channel = channel;
286 phdr->pkt_encap = WTAP_ENCAP_DPNSS;
289 case EYESDN_ENCAP_DASS2: /* DASS2 frames */
290 pseudo_header->isdn.uton = direction & 1;
291 pseudo_header->isdn.channel = channel;
292 phdr->pkt_encap = WTAP_ENCAP_DPNSS;
295 case EYESDN_ENCAP_BACNET: /* BACNET async over HDLC frames */
296 pseudo_header->isdn.uton = direction & 1;
297 pseudo_header->isdn.channel = channel;
298 phdr->pkt_encap = WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR;
301 case EYESDN_ENCAP_V5_EF: /* V5EF */
302 pseudo_header->isdn.uton = direction & 1;
303 pseudo_header->isdn.channel = channel;
304 phdr->pkt_encap = WTAP_ENCAP_V5_EF;
308 if(pkt_len > EYESDN_MAX_PACKET_LEN) {
309 *err = WTAP_ERR_BAD_FILE;
310 *err_info = g_strdup_printf("eyesdn: File has %u-byte packet, bigger than maximum of %u",
311 pkt_len, EYESDN_MAX_PACKET_LEN);
315 phdr->rec_type = REC_TYPE_PACKET;
316 phdr->presence_flags = WTAP_HAS_TS;
317 phdr->ts.secs = secs;
318 phdr->ts.nsecs = usecs * 1000;
319 phdr->caplen = pkt_len;
322 /* Make sure we have enough room for the packet */
323 ws_buffer_assure_space(buf, EYESDN_MAX_PACKET_LEN);
325 pd = ws_buffer_start_ptr(buf);
326 if (!esc_read(fh, pd, pkt_len, err, err_info))
333 esc_write(wtap_dumper *wdh, const guint8 *buf, int len, int *err)
337 static const guint8 esc = 0xfe;
339 for(i=0; i<len; i++) {
341 if(byte == 0xff || byte == 0xfe) {
343 * Escape the frame delimiter and escape byte.
345 if (!wtap_dump_file_write(wdh, &esc, sizeof esc, err))
349 if (!wtap_dump_file_write(wdh, &byte, sizeof byte, err))
355 static gboolean eyesdn_dump(wtap_dumper *wdh,
356 const struct wtap_pkthdr *phdr,
357 const guint8 *pd, int *err, gchar **err_info);
359 gboolean eyesdn_dump_open(wtap_dumper *wdh, int *err)
361 wdh->subtype_write=eyesdn_dump;
363 if (!wtap_dump_file_write(wdh, eyesdn_hdr_magic,
364 EYESDN_HDR_MAGIC_SIZE, err))
366 wdh->bytes_dumped += EYESDN_HDR_MAGIC_SIZE;
371 int eyesdn_dump_can_write_encap(int encap)
374 case WTAP_ENCAP_ISDN:
375 case WTAP_ENCAP_LAYER1_EVENT:
376 case WTAP_ENCAP_DPNSS:
377 case WTAP_ENCAP_ATM_PDUS_UNTRUNCATED:
378 case WTAP_ENCAP_LAPB:
379 case WTAP_ENCAP_MTP2_WITH_PHDR:
380 case WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR:
381 case WTAP_ENCAP_PER_PACKET:
385 return WTAP_ERR_UNWRITABLE_ENCAP;
389 /* Write a record for a packet to a dump file.
390 * Returns TRUE on success, FALSE on failure. */
391 static gboolean eyesdn_dump(wtap_dumper *wdh,
392 const struct wtap_pkthdr *phdr,
393 const guint8 *pd, int *err, gchar **err_info _U_)
395 static const guint8 start_flag = 0xff;
396 const union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
397 guint8 buf[EYESDN_HDR_LENGTH];
405 /* We can only write packet records. */
406 if (phdr->rec_type != REC_TYPE_PACKET) {
407 *err = WTAP_ERR_UNWRITABLE_REC_TYPE;
411 /* Don't write out anything bigger than we can read.
412 * (The length field in packet headers is 16 bits, which
413 * imposes a hard limit.) */
414 if (phdr->caplen > 65535) {
415 *err = WTAP_ERR_PACKET_TOO_LARGE;
419 usecs=phdr->ts.nsecs/1000;
422 origin = pseudo_header->isdn.uton;
423 channel = pseudo_header->isdn.channel;
425 switch(phdr->pkt_encap) {
427 case WTAP_ENCAP_ISDN:
428 protocol=EYESDN_ENCAP_ISDN; /* set depending on decoder format and mode */
431 case WTAP_ENCAP_LAYER1_EVENT:
432 protocol=EYESDN_ENCAP_MSG;
435 case WTAP_ENCAP_DPNSS:
436 protocol=EYESDN_ENCAP_DPNSS;
440 case WTAP_ENCAP_DASS2:
441 protocol=EYESDN_ENCAP_DASS2;
445 case WTAP_ENCAP_ATM_PDUS_UNTRUNCATED:
446 protocol=EYESDN_ENCAP_ATM;
450 case WTAP_ENCAP_LAPB:
451 protocol=EYESDN_ENCAP_LAPB;
454 case WTAP_ENCAP_MTP2_WITH_PHDR:
455 protocol=EYESDN_ENCAP_MTP2;
458 case WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR:
459 protocol=EYESDN_ENCAP_BACNET;
462 case WTAP_ENCAP_V5_EF:
463 protocol=EYESDN_ENCAP_V5_EF;
467 *err=WTAP_ERR_UNWRITABLE_ENCAP;
471 phton24(&buf[0], usecs);
474 buf[4] = (guint8)(0xff & (secs >> 24));
475 buf[5] = (guint8)(0xff & (secs >> 16));
476 buf[6] = (guint8)(0xff & (secs >> 8));
477 buf[7] = (guint8)(0xff & (secs >> 0));
479 buf[8] = (guint8) channel;
480 buf[9] = (guint8) (origin?1:0) + (protocol << 1);
481 phtons(&buf[10], size);
484 if (!wtap_dump_file_write(wdh, &start_flag, sizeof start_flag, err))
486 if (!esc_write(wdh, buf, 12, err))
488 if (!esc_write(wdh, pd, size, err))
494 * Editor modelines - http://www.wireshark.org/tools/modelines.html
499 * indent-tabs-mode: t
502 * vi: set shiftwidth=8 tabstop=8 noexpandtab:
503 * :indentSize=8:tabSize=8:noTabs=false: