/* hcidump.c

 *

 * Copyright (c) 2003 by Marcel Holtmann <marcel@holtmann.org>

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

#include "config.h"

#include "hcidump.h"

#include "wtap_module.h"

#include "file_wrappers.h"

static int hcidump_file_type_subtype = -1;

void register_hcidump(void);

struct dump_hdr {

  uint16_t len;

  uint8_t  in;

  uint8_t  pad;

  uint32_t ts_sec;

  uint32_t ts_usec;

};

#define DUMP_HDR_SIZE (sizeof(struct dump_hdr))

static bool hcidump_read_packet(wtap *wth, FILE_T fh, wtap_rec *rec,

    int *err, char **err_info)

{

  struct dump_hdr dh;

  unsigned packet_size;

  if (!wtap_read_bytes_or_eof(fh, &dh, DUMP_HDR_SIZE, err, err_info))

    return false;

  packet_size = GUINT16_FROM_LE(dh.len);

  if (packet_size > WTAP_MAX_PACKET_SIZE_STANDARD) {

    /*

     * Probably a corrupt capture file; don't blow up trying

     * to allocate space for an immensely-large packet.

     */

    *err = WTAP_ERR_BAD_FILE;

    *err_info = ws_strdup_printf("hcidump: File has %u-byte packet, bigger than maximum of %u",

      packet_size, WTAP_MAX_PACKET_SIZE_STANDARD);

    return false;

  }

  wtap_setup_packet_rec(rec, wth->file_encap);

  rec->block = wtap_block_create(WTAP_BLOCK_PACKET);

  rec->presence_flags = WTAP_HAS_TS;

  rec->ts.secs = GUINT32_FROM_LE(dh.ts_sec);

  rec->ts.nsecs = GUINT32_FROM_LE(dh.ts_usec) * 1000;

  rec->rec_header.packet_header.caplen = packet_size;

  rec->rec_header.packet_header.len = packet_size;

  rec->rec_header.packet_header.pseudo_header.p2p.sent = (dh.in ? false : true);

  return wtap_read_bytes_buffer(fh, &rec->data, packet_size, err, err_info);

}

static bool hcidump_read(wtap *wth, wtap_rec *rec,

    int *err, char **err_info, int64_t *data_offset)

{

  *data_offset = file_tell(wth->fh);

  return hcidump_read_packet(wth, wth->fh, rec, err, err_info);

}

static bool hcidump_seek_read(wtap *wth, int64_t seek_off,

    wtap_rec *rec, int *err, char **err_info)

{

  if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)

    return false;

  return hcidump_read_packet(wth, wth->random_fh, rec, err, err_info);

}

wtap_open_return_val hcidump_open(wtap *wth, int *err, char **err_info)

{

  struct dump_hdr dh;

  uint8_t type;

  if (!wtap_read_bytes(wth->fh, &dh, DUMP_HDR_SIZE, err, err_info)) {

    if (*err != WTAP_ERR_SHORT_READ)

      return WTAP_OPEN_ERROR;

    return WTAP_OPEN_NOT_MINE;

  }

  if ((dh.in != 0 && dh.in != 1) || dh.pad != 0

      || GUINT16_FROM_LE(dh.len) < 1)

    return WTAP_OPEN_NOT_MINE;

  if (!wtap_read_bytes(wth->fh, &type, 1, err, err_info)) {

    if (*err != WTAP_ERR_SHORT_READ)

      return WTAP_OPEN_ERROR;

    return WTAP_OPEN_NOT_MINE;

  }

  if (type < 1 || type > 4)

    return WTAP_OPEN_NOT_MINE;

  if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)

    return WTAP_OPEN_ERROR;

  wth->file_type_subtype = hcidump_file_type_subtype;

  wth->file_encap = WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR;

  wth->snapshot_length = 0;

  wth->subtype_read = hcidump_read;

  wth->subtype_seek_read = hcidump_seek_read;

  wth->file_tsprec = WTAP_TSPREC_USEC;

  /*

   * Add an IDB; we don't know how many interfaces were

   * involved, so we just say one interface, about which

   * we only know the link-layer type, snapshot length,

   * and time stamp resolution.

   */

  wtap_add_generated_idb(wth);

  return WTAP_OPEN_MINE;

}

static const struct supported_block_type hcidummp_blocks_supported[] = {

  /*

   * We support packet blocks, with no comments or other options.

   */

  { WTAP_BLOCK_PACKET, MULTIPLE_BLOCKS_SUPPORTED, NO_OPTIONS_SUPPORTED }

};

static const struct file_type_subtype_info hcidump_info = {

  "Bluetooth HCI dump", "hcidump", NULL, NULL,

  false, BLOCKS_SUPPORTED(hcidummp_blocks_supported),

  NULL, NULL, NULL

};

void register_hcidump(void)

{

  hcidump_file_type_subtype = wtap_register_file_type_subtype(&hcidump_info);

  /*

   * Register name for backwards compatibility with the

   * wtap_filetypes table in Lua.

   */

  wtap_register_backwards_compatibility_lua_name("HCIDUMP",

      hcidump_file_type_subtype);

}

/*

 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html

 *

 * Local variables:

 * c-basic-offset: 8

 * tab-width: 8

 * indent-tabs-mode: t

 * End:

 *

 * vi: set shiftwidth=8 tabstop=8 noexpandtab:

 * :indentSize=8:tabSize=8:noTabs=false:

 */