RFC 1782 (rfc1782) - Page 2 of 6

TFTP Option Extension

Alternative Format: Original Text Document


RFC 1782                 TFTP Option Extension                March 1995


   Options are appended to a TFTP Read Request or Write Request packet
   as follows:

      +-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+-->
      |  opc  |filename| 0 |  mode  | 0 |  opt1  | 0 | value1 | 0 | <
      +-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+-->

       >-------+---+---~~---+---+
      <  optN  | 0 | valueN | 0 |
       >-------+---+---~~---+---+

      The "0"s shown in these illustrations and the ones below are all
      all zero octets, i.e., NULL terminators for the preceeding
      fields.

      opc
         The opcode field contains either a 1, for Read Requests, or 2,
         for Write Requests, as defined in [1].

      filename
         The name of the file to be read or written, as defined in [1].
         This is a NULL-terminated field.

      mode
         The mode of the file transfer: "netascii", "octet", or "mail",
         as defined in [1].  This is a NULL-terminated field.

      opt1
         The first option, in case-insensitive ASCII (e.g., "blksize").
         This is a NULL-terminated ASCII field.

      value1
         The value associated with the first option, in case-insensitive
         ASCII.  This is a NULL-terminated field.

      optN, valueN
         The final option/value pair.  Each NULL-terminated field is
         specified in case-insensitive ASCII.

   The options and values are all NULL-terminated, in keeping with the
   original request format.  If multiple options are to be negotiated,
   they are appended to each other.  The order in which options are
   specified is not significant.  The maximum size of a request packet
   is 512 octets.







Malkin & Harkin

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