3 * Copyright (c) 2003 Endace Technology Ltd, Hamilton, New Zealand.
6 * This software and documentation has been developed by Endace Technology Ltd.
7 * along with the DAG PCI network capture cards. For further information please
8 * visit http://www.endace.com/.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions are met:
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * 3. The name of Endace Technology Ltd may not be used to endorse or promote
21 * products derived from this software without specific prior written
24 * THIS SOFTWARE IS PROVIDED BY ENDACE TECHNOLOGY LTD ``AS IS'' AND ANY EXPRESS
25 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
27 * EVENT SHALL ENDACE TECHNOLOGY LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
31 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
39 * erf - Endace ERF (Extensible Record Format)
43 * http://www.endace.com/support/EndaceRecordFormat.pdf
54 #include "file_wrappers.h"
60 #define min(a, b) ((a) > (b) ? (b) : (a))
63 static int erf_read_header(FILE_T fh,
64 struct wtap_pkthdr *phdr,
65 union wtap_pseudo_header *pseudo_header,
66 erf_header_t *erf_header,
70 guint32 *packet_size);
71 static gboolean erf_read(wtap *wth, int *err, gchar **err_info,
73 static gboolean erf_seek_read(wtap *wth, gint64 seek_off,
74 union wtap_pseudo_header *pseudo_header, guchar *pd,
75 int length, int *err, gchar **err_info);
77 extern int erf_open(wtap *wth, int *err, gchar **err_info _U_)
79 int i, n, records_for_erf_check = RECORDS_FOR_ERF_CHECK;
81 erf_timestamp_t prevts,ts;
90 memset(&prevts, 0, sizeof(prevts));
92 /* number of records to scan before deciding if this really is ERF */
93 if ((s = getenv("ERF_RECORDS_TO_CHECK")) != NULL) {
94 if ((n = atoi(s)) > 0 && n < 101) {
95 records_for_erf_check = n;
100 * ERF is a little hard because there's no magic number; we look at
101 * the first few records and see if they look enough like ERF
105 for (i = 0; i < records_for_erf_check; i++) { /* records_for_erf_check */
107 r = file_read(&header,1,sizeof(header),wth->fh);
110 if (r != sizeof(header)) {
111 if ((*err = file_error(wth->fh)) != 0) {
114 /* ERF header too short accept the file,
115 only if the very first records have been successfully checked */
116 if (i < MIN_RECORDS_FOR_ERF_CHECK) {
119 /* BREAK, the last record is too short, and will be ignored */
125 rlen=g_ntohs(header.rlen);
126 wlen=g_ntohs(header.wlen);
127 packet_size = rlen - sizeof(header);
129 /* fail on invalid record type, invalid rlen, timestamps decreasing, or incrementing too far */
131 /* Test valid rlen >= 16 */
136 if (packet_size > WTAP_MAX_PACKET_SIZE) {
138 * Probably a corrupt capture file; don't blow up trying
139 * to allocate space for an immensely-large packet.
144 /* Skip PAD records, timestamps may not be set */
145 if (header.type == ERF_TYPE_PAD) {
146 if (file_seek(wth->fh, packet_size, SEEK_CUR, err) == -1) {
152 /* fail on invalid record type, decreasing timestamps or non-zero pad-bits */
153 /* Not all types within this range are decoded, but it is a first filter */
154 if (header.type == 0 || header.type > ERF_TYPE_MAX ) {
158 /* The ERF_TYPE_MAX is the PAD record, but the last used type is ERF_TYPE_INFINIBAND */
159 if (header.type > ERF_TYPE_INFINIBAND) {
163 if ((ts = pletohll(&header.ts)) < prevts) {
164 /* reassembled AALx records may not be in time order, also records are not in strict time order between physical interfaces, so allow 1 sec fudge */
165 if ( ((prevts-ts)>>32) > 1 ) {
170 /* Check to see if timestamp increment is > 1 week */
171 if ( (i) && (ts > prevts) && (((ts-prevts)>>32) > 3600*24*7) ) {
175 memcpy(&prevts, &ts, sizeof(prevts));
177 /* Read over MC or ETH subheader */
178 switch(header.type) {
179 case ERF_TYPE_MC_HDLC:
180 case ERF_TYPE_MC_RAW:
181 case ERF_TYPE_MC_ATM:
182 case ERF_TYPE_MC_RAW_CHANNEL:
183 case ERF_TYPE_MC_AAL5:
184 case ERF_TYPE_MC_AAL2:
185 case ERF_TYPE_COLOR_MC_HDLC_POS:
186 if (file_read(&mc_hdr,1,sizeof(mc_hdr),wth->fh) != sizeof(mc_hdr)) {
187 *err = file_error(wth->fh);
190 packet_size -= sizeof(mc_hdr);
193 case ERF_TYPE_COLOR_ETH:
194 case ERF_TYPE_DSM_COLOR_ETH:
195 if (file_read(ð_hdr,1,sizeof(eth_hdr),wth->fh) != sizeof(eth_hdr)) {
196 *err = file_error(wth->fh);
199 packet_size -= sizeof(eth_hdr);
205 /* The file_seek function do not return an error if the end of file
206 is reached whereas the record is truncated */
207 buffer=g_malloc(packet_size);
208 r = file_read(buffer, 1, packet_size, wth->fh);
211 if (r != packet_size) {
212 /* ERF record too short, accept the file,
213 only if the very first records have been successfully checked */
214 if (i < MIN_RECORDS_FOR_ERF_CHECK) {
219 } /* records_for_erf_check */
221 if (file_seek(wth->fh, 0L, SEEK_SET, err) == -1) { /* rewind */
225 wth->data_offset = 0;
227 /* This is an ERF file */
228 wth->file_type = WTAP_FILE_ERF;
229 wth->snapshot_length = 0; /* not available in header, only in frame */
232 * Use the encapsulation for ERF records.
234 wth->file_encap = WTAP_ENCAP_ERF;
236 wth->subtype_read = erf_read;
237 wth->subtype_seek_read = erf_seek_read;
238 wth->tsprecision = WTAP_FILE_TSPREC_NSEC;
243 /* Read the next packet */
244 static gboolean erf_read(wtap *wth, int *err, gchar **err_info,
247 erf_header_t erf_header;
248 guint32 packet_size, bytes_read;
250 *data_offset = wth->data_offset;
253 if (!erf_read_header(wth->fh,
254 &wth->phdr, &wth->pseudo_header, &erf_header,
255 err, err_info, &bytes_read, &packet_size)) {
258 wth->data_offset += bytes_read;
259 } while ( erf_header.type == ERF_TYPE_PAD );
261 buffer_assure_space(wth->frame_buffer, packet_size);
263 wtap_file_read_expected_bytes(buffer_start_ptr(wth->frame_buffer),
264 (gint32)(packet_size), wth->fh, err );
265 wth->data_offset += packet_size;
270 static gboolean erf_seek_read(wtap *wth, gint64 seek_off,
271 union wtap_pseudo_header *pseudo_header, guchar *pd,
272 int length _U_, int *err, gchar **err_info)
274 erf_header_t erf_header;
277 if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
281 if (!erf_read_header(wth->random_fh, NULL, pseudo_header, &erf_header,
282 err, err_info, NULL, &packet_size))
284 } while ( erf_header.type == ERF_TYPE_PAD );
286 wtap_file_read_expected_bytes(pd, (int)packet_size, wth->random_fh, err);
291 static int erf_read_header(FILE_T fh,
292 struct wtap_pkthdr *phdr,
293 union wtap_pseudo_header *pseudo_header,
294 erf_header_t *erf_header,
298 guint32 *packet_size)
301 guint16 eth_hdr,skiplen=0;
303 wtap_file_read_expected_bytes(erf_header, sizeof(*erf_header), fh, err);
304 if (bytes_read != NULL) {
305 *bytes_read = sizeof(*erf_header);
308 *packet_size = g_ntohs(erf_header->rlen) - sizeof(*erf_header);
310 if (*packet_size > WTAP_MAX_PACKET_SIZE) {
312 * Probably a corrupt capture file; don't blow up trying
313 * to allocate space for an immensely-large packet.
315 *err = WTAP_ERR_BAD_RECORD;
316 *err_info = g_strdup_printf("erf: File has %u-byte packet, bigger than maximum of %u",
317 *packet_size, WTAP_MAX_PACKET_SIZE);
322 guint64 ts = pletohll(&erf_header->ts);
324 phdr->ts.secs = (long) (ts >> 32);
325 ts = ((ts & 0xffffffff) * 1000 * 1000 * 1000);
326 ts += (ts & 0x80000000) << 1; /* rounding */
327 phdr->ts.nsecs = ((long) (ts >> 32));
328 if (phdr->ts.nsecs >= 1000000000) {
329 phdr->ts.nsecs -= 1000000000;
334 /* Copy the ERF pseudo header */
335 pseudo_header->erf.phdr.ts = pletohll(&erf_header->ts);
336 pseudo_header->erf.phdr.type = erf_header->type;
337 pseudo_header->erf.phdr.flags = erf_header->flags;
338 pseudo_header->erf.phdr.rlen = g_ntohs(erf_header->rlen);
339 pseudo_header->erf.phdr.lctr = g_ntohs(erf_header->lctr);
340 pseudo_header->erf.phdr.wlen = g_ntohs(erf_header->wlen);
342 switch (erf_header->type) {
344 case ERF_TYPE_INFINIBAND:
347 phdr->len = g_htons(erf_header->wlen);
348 phdr->caplen = g_htons(erf_header->wlen);
354 case ERF_TYPE_HDLC_POS:
355 case ERF_TYPE_COLOR_HDLC_POS:
356 case ERF_TYPE_DSM_COLOR_HDLC_POS:
363 case ERF_TYPE_COLOR_ETH:
364 case ERF_TYPE_DSM_COLOR_ETH:
365 wtap_file_read_expected_bytes(ð_hdr, sizeof(eth_hdr), fh, err);
366 if (bytes_read != NULL)
367 *bytes_read += sizeof(eth_hdr);
368 *packet_size -= sizeof(eth_hdr);
369 skiplen = sizeof(eth_hdr);
370 pseudo_header->erf.subhdr.eth_hdr = g_htons(eth_hdr);
373 case ERF_TYPE_MC_HDLC:
374 case ERF_TYPE_MC_RAW:
375 case ERF_TYPE_MC_ATM:
376 case ERF_TYPE_MC_RAW_CHANNEL:
377 case ERF_TYPE_MC_AAL5:
378 case ERF_TYPE_MC_AAL2:
379 case ERF_TYPE_COLOR_MC_HDLC_POS:
380 wtap_file_read_expected_bytes(&mc_hdr, sizeof(mc_hdr), fh, err);
381 if (bytes_read != NULL)
382 *bytes_read += sizeof(mc_hdr);
383 *packet_size -= sizeof(mc_hdr);
384 skiplen = sizeof(mc_hdr);
385 pseudo_header->erf.subhdr.mc_hdr = g_htonl(mc_hdr);
388 case ERF_TYPE_IP_COUNTER:
389 case ERF_TYPE_TCP_FLOW_COUNTER:
390 /* unsupported, continue with default: */
392 *err = WTAP_ERR_UNSUPPORTED_ENCAP;
393 *err_info = g_strdup_printf("erf: unknown record encapsulation %u",
399 phdr->len = g_htons(erf_header->wlen);
400 phdr->caplen = min( g_htons(erf_header->wlen),
401 g_htons(erf_header->rlen) - sizeof(*erf_header) - skiplen );