wiretap/tnef.c

   1 /* tnef.c
   2  *
   3  * Transport-Neutral Encapsulation Format (TNEF) file reading
   4  *
   5  * SPDX-License-Identifier: GPL-2.0-or-later
   6  */
   7
   8 #include "config.h"
   9 #include "tnef.h"
  10
  11 #include "wtap-int.h"
  12 #include "file_wrappers.h"
  13 #include <wsutil/buffer.h>
  14
  15 static int tnef_file_type_subtype = -1;
  16
  17 void register_tnef(void);
  18
  19 wtap_open_return_val tnef_open(wtap *wth, int *err, char **err_info)
  20 {
  21   uint32_t magic;
  22
  23   if (!wtap_read_bytes(wth->fh, &magic, sizeof magic, err, err_info))
  24     return (*err != WTAP_ERR_SHORT_READ) ? WTAP_OPEN_ERROR : WTAP_OPEN_NOT_MINE;
  25
  26   if (GUINT32_TO_LE(magic) != TNEF_SIGNATURE)
  27      /* Not a tnef file */
  28      return WTAP_OPEN_NOT_MINE;
  29
  30   /* seek back to the start of the file  */
  31   if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
  32     return WTAP_OPEN_ERROR;
  33
  34   wth->file_type_subtype = tnef_file_type_subtype;
  35   wth->file_encap = WTAP_ENCAP_TNEF;
  36   wth->snapshot_length = 0;
  37
  38   wth->subtype_read = wtap_full_file_read;
  39   wth->subtype_seek_read = wtap_full_file_seek_read;
  40   wth->file_tsprec = WTAP_TSPREC_SEC;
  41
  42   return WTAP_OPEN_MINE;
  43 }
  44
  45 static const struct supported_block_type tnef_blocks_supported[] = {
  46   /*
  47    * This is a file format that we dissect, so we provide only one
  48    * "packet" with the file's contents, and don't support any
  49    * options.
  50    */
  51   { WTAP_BLOCK_PACKET, ONE_BLOCK_SUPPORTED, NO_OPTIONS_SUPPORTED }
  52 };
  53
  54 static const struct file_type_subtype_info tnef_info = {
  55   "Transport-Neutral Encapsulation Format", "tnef", NULL, NULL,
  56   false, BLOCKS_SUPPORTED(tnef_blocks_supported),
  57   NULL, NULL, NULL
  58 };
  59
  60 void register_tnef(void)
  61 {
  62   tnef_file_type_subtype = wtap_register_file_type_subtype(&tnef_info);
  63
  64   /*
  65    * Register name for backwards compatibility with the
  66    * wtap_filetypes table in Lua.
  67    */
  68   wtap_register_backwards_compatibility_lua_name("TNEF",
  69                                                  tnef_file_type_subtype);
  70 }
  71
  72 /*
  73  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
  74  *
  75  * Local Variables:
  76  * c-basic-offset: 2
  77  * tab-width: 8
  78  * indent-tabs-mode: nil
  79  * End:
  80  *
  81  * vi: set shiftwidth=2 tabstop=8 expandtab:
  82  * :indentSize=2:tabSize=8:noTabs=true:
  83  */