![Anders Broman](/assets/img/avatar_default.png)
Fail to load I4B traces http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1972 svn path=/trunk/; revision=23367
193 lines
4.6 KiB
C
193 lines
4.6 KiB
C
/* ber.c
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*
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* Basic Encoding Rules (BER) file reading
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*
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* $Id$
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <errno.h>
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#include "wtap-int.h"
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#include "file_wrappers.h"
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#include "buffer.h"
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#include "ber.h"
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#define BER_CLASS_UNI 0
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#define BER_CLASS_APP 1
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#define BER_CLASS_CON 2
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#define BER_UNI_TAG_SEQ 16 /* SEQUENCE, SEQUENCE OF */
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#define BER_UNI_TAG_SET 17 /* SET, SET OF */
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static gboolean ber_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
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{
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guint8 *buf;
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gint64 file_size;
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int packet_size;
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struct stat statb;
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*err = 0;
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/* there is only ever one packet */
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if(wth->data_offset)
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return FALSE;
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*data_offset = wth->data_offset;
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if ((file_size = wtap_file_size(wth, err)) == -1)
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return FALSE;
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if (file_size > WTAP_MAX_PACKET_SIZE) {
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/*
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* Probably a corrupt capture file; don't blow up trying
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* to allocate space for an immensely-large packet.
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*/
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*err = WTAP_ERR_BAD_RECORD;
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*err_info = g_strdup_printf("ber: File has %" G_GINT64_MODIFIER "d-byte packet, bigger than maximum of %u",
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file_size, WTAP_MAX_PACKET_SIZE);
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return FALSE;
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}
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packet_size = (int)file_size;
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buffer_assure_space(wth->frame_buffer, packet_size);
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buf = buffer_start_ptr(wth->frame_buffer);
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wtap_file_read_expected_bytes(buf, packet_size, wth->fh, err);
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wth->data_offset += packet_size;
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wth->phdr.caplen = packet_size;
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wth->phdr.len = packet_size;
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if (fstat(wth->fd, &statb) == -1) {
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*err = errno;
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return FALSE;
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}
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wth->phdr.ts.secs = statb.st_mtime;
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wth->phdr.ts.nsecs = 0;
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return TRUE;
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}
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static gboolean ber_seek_read(wtap *wth, gint64 seek_off, union wtap_pseudo_header *pseudo_header _U_,
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guint8 *pd, int length, int *err, gchar **err_info _U_)
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{
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int packet_size = length;
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/* there is only one packet */
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if(seek_off > 0) {
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*err = 0;
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return FALSE;
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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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wtap_file_read_expected_bytes(pd, packet_size, wth->random_fh, err);
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return TRUE;
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}
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int ber_open(wtap *wth, int *err, gchar **err_info _U_)
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{
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#define BER_BYTES_TO_CHECK 4
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guint8 bytes[BER_BYTES_TO_CHECK];
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int bytes_read;
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guint8 id;
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gint8 class;
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gint8 tag;
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gboolean pc;
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guint8 oct, nlb = 0;
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int len = 0;
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gint64 file_size;
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int offset = 0, i;
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bytes_read = file_read(&bytes, 1, BER_BYTES_TO_CHECK, wth->fh);
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if (bytes_read != BER_BYTES_TO_CHECK) {
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*err = file_error(wth->fh);
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return (*err != 0) ? -1 : 0;
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}
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id = bytes[offset++];
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class = (id>>6) & 0x03;
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pc = (id>>5) & 0x01;
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tag = id & 0x1F;
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/* it must be constructed and either a SET or a SEQUENCE */
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/* or a CONTEXT less than 32 (arbitrary) */
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/* XXX: do we also want to allow APPLICATION */
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if(!(pc &&
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(((class == BER_CLASS_UNI) && ((tag == BER_UNI_TAG_SET) || (tag == BER_UNI_TAG_SEQ))) ||
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((class == BER_CLASS_CON) && (tag < 32)))))
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return 0;
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/* now check the length */
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oct = bytes[offset++];
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if(!(oct & 0x80))
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len = oct;
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else {
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nlb = oct & 0x7F; /* number of length bytes */
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if((nlb > 0) && (nlb <= (BER_BYTES_TO_CHECK - 2))) {
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/* not indefinite length and we have read enough bytes to compute the length */
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i = nlb;
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while(i--) {
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oct = bytes[offset++];
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len = (len<<8) + oct;
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}
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}
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}
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if(len) { /* if we have a length, check it */
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len += (2 + nlb); /* add back Tag and Length bytes */
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file_size = wtap_file_size(wth, err);
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if(len != file_size) {
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return 0; /* not ASN.1 */
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}
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}else{
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/* XXX what if indefinet length? */
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return 0;
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}
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/* seek back to the start of the file */
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
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return -1;
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wth->file_type = WTAP_FILE_BER;
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wth->file_encap = WTAP_ENCAP_BER;
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wth->snapshot_length = 0;
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wth->subtype_read = ber_read;
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wth->subtype_seek_read = ber_seek_read;
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wth->tsprecision = WTAP_FILE_TSPREC_SEC;
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return 1;
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}
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