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       authbind-helper  -  helper  program to bind sockets to privileged ports
       without root


       /usr/lib/authbind/helper addr-hex port-hex <socket


       helper is the program used by libauthbind, which is  in  turn  used  by
       authbind  to  allow  programs which do not or should not run as root to
       bind to low-numbered ports in a controlled way.  See authbind(1).

       It may also be used standalone, i.e. without assistance from  authbind.
       Its  standard  input should be a TCP/IP socket, and it should be passed
       two arguments.

       The arguments are the address and port number, respectively,  to  which
       the  caller  desires  that  the  socket  be  bound.  They should be hex
       strings, without leading 0x, of exactly  the  right  length  (8  and  4
       digits, respectively), being a pairs of hex digits for each byte in the
       address or port number when expressed in network byte order.

       helper will not bind to ports 512 and onwards,  because  programs  like
       rshd  expect  these  to be used for outgoing connections, so allowing a
       user to bind to one of these would open up security hole(s).


       helper will exit with code 0 on success.

       If possible, helper will return an appropriate errno value as its  exit
       status.  If this is not possible it may exit with status 255 or with an
       exit status corresponding to ENOSYS (Function not implemented).


       See authbind(1) for details of the access control regime implemented by


       authbind(1), bind(2)


       authbind  and  this  manpage  were  written  by  Ian Jackson.  They are
       Copyright (C)1998 by him and released  under  the  GNU  General  Public
       Licence;  there  is  NO  WARRANTY.  See /usr/doc/authbind/copyright and
       /usr/doc/copyright/GPL for details.