wiretap/hcidump.c

   1 /* hcidump.c
   2  *
   3  * $Id$
   4  *
   5  * Copyright (c) 2003 by Marcel Holtmann <marcel@holtmann.org>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include "config.h"
  23
  24 #include "wtap-int.h"
  25 #include "file_wrappers.h"
  26 #include "buffer.h"
  27 #include "hcidump.h"
  28
  29 struct dump_hdr {
  30         guint16 len;
  31         guint8  in;
  32         guint8  pad;
  33         guint32 ts_sec;
  34         guint32 ts_usec;
  35 };
  36
  37 #define DUMP_HDR_SIZE (sizeof(struct dump_hdr))
  38
  39 static gboolean hcidump_process_packet(FILE_T fh, struct wtap_pkthdr *phdr,
  40     Buffer *buf, int *err, gchar **err_info)
  41 {
  42         struct dump_hdr dh;
  43         int bytes_read, packet_size;
  44
  45         bytes_read = file_read(&dh, DUMP_HDR_SIZE, fh);
  46         if (bytes_read != DUMP_HDR_SIZE) {
  47                 *err = file_error(fh, err_info);
  48                 if (*err == 0 && bytes_read != 0)
  49                         *err = WTAP_ERR_SHORT_READ;
  50                 return FALSE;
  51         }
  52
  53         packet_size = GUINT16_FROM_LE(dh.len);
  54         if (packet_size > WTAP_MAX_PACKET_SIZE) {
  55                 /*
  56                  * Probably a corrupt capture file; don't blow up trying
  57                  * to allocate space for an immensely-large packet.
  58                  */
  59                 *err = WTAP_ERR_BAD_FILE;
  60                 *err_info = g_strdup_printf("hcidump: File has %u-byte packet, bigger than maximum of %u",
  61                         packet_size, WTAP_MAX_PACKET_SIZE);
  62                 return FALSE;
  63         }
  64
  65         phdr->presence_flags = WTAP_HAS_TS;
  66         phdr->ts.secs = GUINT32_FROM_LE(dh.ts_sec);
  67         phdr->ts.nsecs = GUINT32_FROM_LE(dh.ts_usec) * 1000;
  68         phdr->caplen = packet_size;
  69         phdr->len = packet_size;
  70
  71         phdr->pseudo_header.p2p.sent = (dh.in ? FALSE : TRUE);
  72
  73         return wtap_read_packet_bytes(fh, buf, packet_size, err, err_info);
  74 }
  75
  76 static gboolean hcidump_read(wtap *wth, int *err, gchar **err_info,
  77     gint64 *data_offset)
  78 {
  79         *data_offset = file_tell(wth->fh);
  80
  81         return hcidump_process_packet(wth->fh, &wth->phdr, wth->frame_buffer,
  82             err, err_info);
  83 }
  84
  85 static gboolean hcidump_seek_read(wtap *wth, gint64 seek_off,
  86     struct wtap_pkthdr *phdr, Buffer *buf, int length _U_,
  87     int *err, gchar **err_info)
  88 {
  89         if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
  90                 return FALSE;
  91
  92         return hcidump_process_packet(wth->random_fh, phdr, buf, err, err_info);
  93 }
  94
  95 int hcidump_open(wtap *wth, int *err, gchar **err_info)
  96 {
  97         struct dump_hdr dh;
  98         guint8 type;
  99         int bytes_read;
 100
 101         bytes_read = file_read(&dh, DUMP_HDR_SIZE, wth->fh);
 102         if (bytes_read != DUMP_HDR_SIZE) {
 103                 *err = file_error(wth->fh, err_info);
 104                 if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
 105                         return -1;
 106                 return 0;
 107         }
 108
 109         if ((dh.in != 0 && dh.in != 1) || dh.pad != 0
 110             || GUINT16_FROM_LE(dh.len) < 1)
 111                 return 0;
 112
 113         bytes_read = file_read(&type, 1, wth->fh);
 114         if (bytes_read != 1) {
 115                 *err = file_error(wth->fh, err_info);
 116                 if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
 117                         return -1;
 118                 return 0;
 119         }
 120
 121         if (type < 1 || type > 4)
 122                 return 0;
 123
 124         if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
 125                 return -1;
 126
 127         wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_HCIDUMP;
 128         wth->file_encap = WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR;
 129         wth->snapshot_length = 0;
 130
 131         wth->subtype_read = hcidump_read;
 132         wth->subtype_seek_read = hcidump_seek_read;
 133         wth->tsprecision = WTAP_FILE_TSPREC_USEC;
 134
 135         return 1;
 136 }