NAME

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

SYNOPSIS

       /usr/lib/authbind/helper addr4-hex port-hex <socket
       /usr/lib/authbind/helper addr6-hex port-hex 6 <socket

DESCRIPTION

       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 or three arguments.

       The  arguments are the address and port number, respectively, to which the caller desires that the socket
       be bound, and the address family (ommitted for IPv4; the fixed string 6 for IPv6).  addr4-hex  and  port-
       hex  should  be  hex  strings,  without  leading  0x,  of  exactly  the  right  length  (8  and 4 digits,
       respectively), being a pair of hex digits for each byte in the address or port number when  expressed  in
       host  byte  order.   For  example, the port argument is the result of something like sprintf(arg, "%04X",
       sin.sin_port).  addr6-hex should be a string of 32 hex digits, being a pair for each byte in the address,
       in network byte order.

EXIT STATUS

       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).

ACCESS CONTROL

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

SEE ALSO

       authbind(1), bind(2)

AUTHOR

       authbind and this manpage were written by Ian Jackson.   They  are  Copyright  (C)1998,2012  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.