🚀 go-pugleaf

In article <1993Jan21.155457.27880@panther.mot.com>, ronf@panther3.panther.mot.com (Ron Feigen) replies:
|> 
|> [text deleted, see earlier posting]
|> 
|> 
|> registerrpc will register a prog#/ver# with portmapper. Portmapper assigns the
|> port #.  svc_unregister() removes the entry.  pmap_getport() looks up a prog#/
|> version# on a host.  You must of course know the host name, prog# and version#
|> in advance.  Be careful about having the same prog# with different version #s.
|> Portmapper returns the port of a program with a match on prog #, but will give
|> you the latest (I believe) version # if it doesn't find an exact match.
|> 
|> 
|> [text deleted, see earlier posting]
|> 
|> Ron
|> 


I was just wondering if it is possible to connect and send commands to the 
RPC portmapper without using RPC calls (svc_xxx or pmap_xxx) but tli or 
socket calls. That approach of connecting and sending commands is possible
when working with some services. For example, I have some source code that 
sends commands to an ftp server after establishing a connection with it on 
its well known port 21. That program follows the same approach as when we 
use a telnet connection to send control commands to ftp (see example).

--o--

Example:
                    ___________________ ftp's well known port
                   /
$ telnet itsname 21
Trying 128.96.133.64 ...
Connected to itsname.
Escape character is '^]'.
220 itsname FTP server ready.  _____________ ftp server accepts connection
USER maritza
331 Password required for maritza.
PASS mypass123
230 User maritza logged in.
HELP
214-The following commands are recognized (* =>'s unimplemented).
   USER     PORT     RETR     MSND*    ALLO     DELE     SITE*    XMKD     CDUP
   PASS     PASV     STOR     MSOM*    REST*    CWD      STAT*    RMD      XCUP
   ACCT*    TYPE     APPE     MSAM*    RNFR     XCWD     HELP     XRMD     STOU
   REIN*    STRU     MLFL*    MRSQ*    RNTO     LIST     NOOP     PWD
   QUIT     MODE     MAIL*    MRCP*    ABOR     NLST     MKD      XPWD
QUIT
221 Goodbye.
Connection closed by foreign host.
$

Note that when using this approach, the commands that the ftp server
recognize are the low level commands described on the RFC959 (e.g.,
PORT, PASV, RETR, STOR).

--o--

The question is: Is it possible to connect and send commands to the RPC 
portmapper using tli or socket calls ?

The protocol specifications for the portmapper (appendix A of the RFC1057) 
does not say anything about the low level commands that the portmapper 
recognizes.

Does anyone knows which low level commands must be given to the portmapper
server after a connection is established to (1) register an application, 
and (2) get the assigned port from a client application ?


Thanks,

Maritza