2008-11-27 16:40:45 +00:00
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/* tnef.c
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*
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* Transport-Neutral Encapsulation Format (TNEF) file reading
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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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2012-06-28 22:56:06 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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2008-11-27 16:40:45 +00:00
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*/
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#include "config.h"
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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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2014-07-15 23:40:46 +00:00
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#include <wsutil/buffer.h>
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2008-11-27 16:40:45 +00:00
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#include "tnef.h"
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2014-05-23 10:50:02 +00:00
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static gboolean tnef_read_file(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info)
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2013-06-02 23:23:47 +00:00
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{
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2013-06-17 22:18:24 +00:00
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gint64 file_size;
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int packet_size;
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2014-05-09 05:18:49 +00:00
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if ((file_size = wtap_file_size(wth, err)) == -1)
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2014-05-23 10:50:02 +00:00
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return FALSE;
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2013-06-17 22:18:24 +00:00
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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_FILE;
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*err_info = g_strdup_printf("tnef: File has %" G_GINT64_MODIFIER "d-byte packet, bigger than maximum of %u",
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2014-05-09 05:18:49 +00:00
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file_size, WTAP_MAX_PACKET_SIZE);
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2014-05-23 10:50:02 +00:00
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return FALSE;
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2013-06-17 22:18:24 +00:00
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}
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packet_size = (int)file_size;
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2014-05-24 18:28:30 +00:00
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phdr->rec_type = REC_TYPE_PACKET;
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2013-06-02 23:23:47 +00:00
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phdr->presence_flags = 0; /* yes, we have no bananas^Wtime stamp */
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phdr->caplen = packet_size;
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phdr->len = packet_size;
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phdr->ts.secs = 0;
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phdr->ts.nsecs = 0;
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2013-06-17 22:18:24 +00:00
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2014-05-23 10:50:02 +00:00
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return wtap_read_packet_bytes(fh, buf, packet_size, err, err_info);
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2013-06-02 23:23:47 +00:00
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}
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2008-11-27 16:40:45 +00:00
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2014-05-23 10:50:02 +00:00
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static gboolean tnef_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
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2008-11-27 16:40:45 +00:00
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{
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2012-05-04 16:56:18 +00:00
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gint64 offset;
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2008-11-27 16:40:45 +00:00
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*err = 0;
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2014-05-09 05:18:49 +00:00
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offset = file_tell(wth->fh);
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2012-05-04 16:56:18 +00:00
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2008-11-27 16:40:45 +00:00
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/* there is only ever one packet */
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2012-05-04 16:56:18 +00:00
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if (offset)
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2014-05-23 10:50:02 +00:00
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return FALSE;
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2008-11-27 16:40:45 +00:00
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2012-05-04 16:56:18 +00:00
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*data_offset = offset;
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2008-11-27 16:40:45 +00:00
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2014-05-09 05:18:49 +00:00
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return tnef_read_file(wth, wth->fh, &wth->phdr, wth->frame_buffer, err, err_info);
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2008-11-27 16:40:45 +00:00
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}
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2014-05-23 10:50:02 +00:00
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static gboolean tnef_seek_read(wtap *wth, gint64 seek_off,
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struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info)
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2008-11-27 16:40:45 +00:00
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{
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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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2014-05-23 10:50:02 +00:00
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return FALSE;
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2008-11-27 16:40:45 +00:00
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}
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2014-05-09 05:18:49 +00:00
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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2014-05-23 10:50:02 +00:00
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return FALSE;
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2008-11-27 16:40:45 +00:00
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2014-05-09 05:18:49 +00:00
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return tnef_read_file(wth, wth->random_fh, phdr, buf, err, err_info);
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2008-11-27 16:40:45 +00:00
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}
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2014-05-09 05:18:49 +00:00
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int tnef_open(wtap *wth, int *err, gchar **err_info)
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2008-11-27 16:40:45 +00:00
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{
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guint32 magic;
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Add some higher-level file-read APIs and use them.
Add wtap_read_bytes(), which takes a FILE_T, a pointer, a byte count, an
error number pointer, and an error string pointer as arguments, and that
treats a short read of any sort, including a read that returns 0 bytes,
as a WTAP_ERR_SHORT_READ error, and that returns the error number and
string through its last two arguments.
Add wtap_read_bytes_or_eof(), which is similar, but that treats a read
that returns 0 bytes as an EOF, supplying an error number of 0 as an EOF
indication.
Use those in file readers; that simplifies the code and makes it less
likely that somebody will fail to supply the error number and error
string on a file read error.
Change-Id: Ia5dba2a6f81151e87b614461349d611cffc16210
Reviewed-on: https://code.wireshark.org/review/4512
Reviewed-by: Guy Harris <guy@alum.mit.edu>
2014-10-07 01:00:57 +00:00
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if (!wtap_read_bytes(wth->fh, &magic, sizeof magic, err, err_info))
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2014-10-09 23:44:15 +00:00
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return (*err != WTAP_ERR_SHORT_READ) ? WTAP_OPEN_ERROR : WTAP_OPEN_NOT_MINE;
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2008-11-27 16:40:45 +00:00
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2013-11-29 18:44:00 +00:00
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if (GUINT32_TO_LE(magic) != TNEF_SIGNATURE)
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2008-11-27 16:40:45 +00:00
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/* Not a tnef file */
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2014-10-09 23:44:15 +00:00
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return WTAP_OPEN_NOT_MINE;
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2008-11-27 16:40:45 +00:00
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/* seek back to the start of the file */
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2014-05-09 05:18:49 +00:00
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
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2014-10-09 23:44:15 +00:00
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return WTAP_OPEN_ERROR;
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2008-11-27 16:40:45 +00:00
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2014-05-09 05:18:49 +00:00
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_TNEF;
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wth->file_encap = WTAP_ENCAP_TNEF;
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wth->snapshot_length = 0;
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2008-11-27 16:40:45 +00:00
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2014-05-09 05:18:49 +00:00
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wth->subtype_read = tnef_read;
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wth->subtype_seek_read = tnef_seek_read;
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2014-09-28 18:37:06 +00:00
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wth->file_tsprec = WTAP_TSPREC_SEC;
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2008-11-27 16:40:45 +00:00
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2014-10-09 23:44:15 +00:00
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return WTAP_OPEN_MINE;
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2008-11-27 16:40:45 +00:00
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}
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