![Guy Harris](/assets/img/avatar_default.png)
wtap_file_read_expected_bytes() from an open routine - open routines are supposed to return -1 on error, 0 if the file doesn't appear to be a file of the specified type, or 1 if the file does appear to be a file of the specified type, but those macros will cause the caller to return FALSE on errors (so that, even if there's an I/O error, it reports "the file isn't a file of the specified type" rather than "we got an error trying to read the file"). When doing reads in an open routine before we've concluded that the file is probably of the right type, return 0, rather than -1, if we get WTAP_ERR_SHORT_READ - if we don't have enough data to check whether a file is of a given type, we should keep trying other types, not give up. For reads done *after* we've concluded the file is probably of the right type, if a read doesn't return the number of bytes we asked for, but returns an error of 0, return WTAP_ERR_SHORT_READ - the file is apparently cut short. For NetMon and NetXRay/Windows Sniffer files, use a #define for the magic number size, and use that for both magic numbers. svn path=/trunk/; revision=46803
164 lines
4.2 KiB
C
164 lines
4.2 KiB
C
/* hcidump.c
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*
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* $Id$
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*
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* Copyright (c) 2003 by Marcel Holtmann <marcel@holtmann.org>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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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 "hcidump.h"
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struct dump_hdr {
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guint16 len;
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guint8 in;
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guint8 pad;
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guint32 ts_sec;
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guint32 ts_usec;
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};
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#define DUMP_HDR_SIZE (sizeof(struct dump_hdr))
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static gboolean hcidump_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset)
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{
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struct dump_hdr dh;
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guint8 *buf;
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int bytes_read, packet_size;
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*data_offset = file_tell(wth->fh);
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bytes_read = file_read(&dh, DUMP_HDR_SIZE, wth->fh);
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if (bytes_read != DUMP_HDR_SIZE) {
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*err = file_error(wth->fh, err_info);
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if (*err == 0 && bytes_read != 0)
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*err = WTAP_ERR_SHORT_READ;
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return FALSE;
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}
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packet_size = GUINT16_FROM_LE(dh.len);
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if (packet_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("hcidump: File has %u-byte packet, bigger than maximum of %u",
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packet_size, WTAP_MAX_PACKET_SIZE);
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return FALSE;
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}
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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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bytes_read = file_read(buf, packet_size, wth->fh);
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if (bytes_read != packet_size) {
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*err = file_error(wth->fh, err_info);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return FALSE;
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}
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wth->phdr.presence_flags = WTAP_HAS_TS;
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wth->phdr.ts.secs = GUINT32_FROM_LE(dh.ts_sec);
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wth->phdr.ts.nsecs = GUINT32_FROM_LE(dh.ts_usec) * 1000;
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wth->phdr.caplen = packet_size;
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wth->phdr.len = packet_size;
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wth->phdr.pseudo_header.p2p.sent = (dh.in ? FALSE : TRUE);
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return TRUE;
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}
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static gboolean hcidump_seek_read(wtap *wth, gint64 seek_off,
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struct wtap_pkthdr *phdr, guint8 *pd, int length,
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int *err, gchar **err_info)
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{
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union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
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struct dump_hdr dh;
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int bytes_read;
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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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bytes_read = file_read(&dh, DUMP_HDR_SIZE, wth->random_fh);
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if (bytes_read != DUMP_HDR_SIZE) {
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*err = file_error(wth->random_fh, err_info);
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if (*err == 0 && bytes_read != 0)
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*err = WTAP_ERR_SHORT_READ;
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return FALSE;
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}
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bytes_read = file_read(pd, length, wth->random_fh);
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if (bytes_read != length) {
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*err = file_error(wth->random_fh, err_info);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return FALSE;
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}
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pseudo_header->p2p.sent = (dh.in ? FALSE : TRUE);
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return TRUE;
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}
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int hcidump_open(wtap *wth, int *err, gchar **err_info)
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{
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struct dump_hdr dh;
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guint8 type;
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int bytes_read;
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bytes_read = file_read(&dh, DUMP_HDR_SIZE, wth->fh);
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if (bytes_read != DUMP_HDR_SIZE) {
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*err = file_error(wth->fh, err_info);
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return -1;
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return 0;
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}
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if ((dh.in != 0 && dh.in != 1) || dh.pad != 0
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|| GUINT16_FROM_LE(dh.len) < 1)
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return 0;
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bytes_read = file_read(&type, 1, wth->fh);
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if (bytes_read != 1) {
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*err = file_error(wth->fh, err_info);
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return -1;
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return 0;
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}
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if (type < 1 || type > 4)
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return 0;
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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_HCIDUMP;
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wth->file_encap = WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR;
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wth->snapshot_length = 0;
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wth->subtype_read = hcidump_read;
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wth->subtype_seek_read = hcidump_seek_read;
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wth->tsprecision = WTAP_FILE_TSPREC_USEC;
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return 1;
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}
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