1 .\" Hey, Emacs! This is an -*- nroff -*- source file.
2 .\" Authors: Ian Jackson
4 .\" authbind is Copyright (C) 1998 Ian Jackson
6 .\" This program is free software; you can redistribute it and/or modify
7 .\" it under the terms of the GNU General Public License as published by
8 .\" the Free Software Foundation; either version 2, or (at your option)
11 .\" This program is distributed in the hope that it will be useful,
12 .\" but WITHOUT ANY WARRANTY; without even the implied warranty of
13 .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 .\" GNU General Public License for more details.
16 .\" You should have received a copy of the GNU General Public License
17 .\" along with this program; if not, write to the Free Software Foundation,
18 .\" Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 .TH AUTHBIND\-HELPER 8 "30th August 1998" "Debian Project" "Debian Linux manual"
25 authbind\-helper \- helper program to bind sockets to privileged ports without root
27 .BI /usr/lib/authbind/helper " addr\-hex port\-hex " < socket
30 is the program used by
32 which is in turn used by
34 to allow programs which do not or should not run as root to bind to
35 low-numbered ports in a controlled way. See
38 It may also be used standalone, i.e. without assistance from
40 Its standard input should be a TCP/IP socket, and it should be passed
43 The arguments are the address and port number, respectively, to which
44 the caller desires that the socket be bound. They should be hex
49 of exactly the right length (8 and 4 digits, respectively), being
50 a pairs of hex digits for each byte in the address or port number when
51 expressed in network byte order.
54 will not bind to ports 512 and onwards, because programs like
56 expect these to be used for outgoing connections, so allowing a user
57 to bind to one of these would open up security hole(s).
60 will exit with code 0 on success.
64 will return an appropriate
66 value as its exit status. If this is not possible it may exit with
67 status 255 or with an exit status corresponding to
69 .RI ( "Function not implemented" ).
73 for details of the access control regime implemented by
80 and this manpage were written by Ian Jackson. They are
82 by him and released under the GNU General Public Licence; there is NO
84 .B /usr/doc/authbind/copyright
86 .B /usr/doc/copyright/GPL