Subj : Problem with filenames containing spaces
To   : Paul Hayton
From : Stas Mishchenkov
Date : Thu Jan 13 2022 10:15 am

Hi, Paul!

13 янв 22 11:53, Paul Hayton -> All:

 PH> This is not a properly escaped filename being sent by BinkD as it does
 PH> not follow the BINKP protocol specifications for filename escaping:

http://ftsc.org/docs/fts-1026.001

Publication:    FTS-1026
Revision:       1
Title:          Binkp/1.0 Protocol specification
Authors:        Michiel Broek
                Stas Degteff
Issue Date:     1 December 2005
Review Date:    1 December 2007

[...skipped...]

  5.2 Escaping method for illegal characters in Command Argument
  --------------------------------------------------------------

   In some cases there is a need to send illegal characters in
   the command argument (usually the file name). These characters
   SHOULD be escaped using form of 4th symbols sequence: "\", "x"
   and two hexadecimal digits (digits "a".."f" may be any case).
   Examples:
   whitespace (" ") excaped as "\x20"; pipe ("|") escaped as "\x7c".

   If escaping may be used in some command argument, mailer MUST
   allways escape character '\' for prevent uncertainty.

   In FSP-1011.003 the escape method is specified as two hexadecimal
   digits preceded with a backslash (e.g. a whitespace is
   transmitted as "\20").  Some mailers have implemented that method.
   It is advised to have a setting for specific nodes to sent escaped
   characters using the incorrect method.

   Any mailer SHOULD decode "\20" into space in file names for
   compatibility purposes.


  5.3 Non-ASCII Characters in Command Argument Symbol String
  ----------------------------------------------------------

   Generally, mailer SHOULD use only characters from the ASCII range
   [32...126] in the symbol strings for command arguments.
   Other characters MAY be used only in M_NUL command argument in
   plain form.
   Implementation recommendation: use isprint() function (ISO C).


  5.4 File Name Issues
  --------------------

   In binkp commands that contain a file name, the file name MUST NOT
   include a whitespace (ASCII value 20 hex). If name of file to send
   contents space, it MUST be escaped. The file name SHOULD NOT
   include symbols other than alphanumeric (A-Z,a-z,0-9) and safe
   characters as defined below in BNF. All other symbols are to be
   considered unsafe and SHOULD be escaped. Space and backslash (\)
   MUST be escaped.
   For example: file name "abcd e.0f@" must be transmitted in form
   "abcd\x20e.0f@".

   filename= *pchar
   pchar   = plain | escaped
   plain   = alpha | digit | safe
   safe    = "!" | """ | "#" | "$" | "%" | "&" | "'" | "(" | ")" |
             "*" | "+" | "," | "-" | "." | "/" | ":" | ";" | "<" |
             "=" | ">" | "?" | "@" | "[" | "]" | "^" | "_" | "`" |
             "{" | "|" | "}" | "~"
   alpha   = "A" | "B" | ... | "Z" | "a" | "b" | ... | "z"
   digit   = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
   escaped = "\x" HEX HEX
   HEX     = digit | "A" | "B" | "C" | "D" | "E" | "F" | "a" | "b" |
               "c" | "d" | "e" | "f"

   Note: some characters are illegal for file names in some OS such as
   DOS or Windows. The protocol do not impose limitations for these
   characters in file names and if mailer receives OS incompatible
   file name then it's reaction determine on a implementation: mailer
   may be destructive skip file, save file with some legal name or
   other.

   The protocol does not impose limitations on the file name length
   other than those arising from the finite length of the binkp frame
   itself. Really file name length can't exceed 32751 bytes.


Have nice nights.
       Stas Mishchenkov.

--- Старость - это когда видишь сиськи и вспоминаешь, что забыл молока купить
 * Origin: Lame Users Breeding. Simferopol, Crimea. (2:460/5858)

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