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AUTHBIND\-HELPER

Section: Debian Linux manual (8)
Updated: 30th August 1998
Index

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

helperis the program used bylibauthbind,which is in turn used byauthbindto allow programs which do not or should not run as root to bind tolow-numbered ports in a controlled way. Seeauthbind(1).

It may also be used standalone, i.e. without assistance fromauthbind.Its standard input should be a TCP/IP socket, and it should be passedtwo or three arguments.

The arguments are the address and port number, respectively, to whichthe caller desires that the socket be bound, and the address family(ommitted for IPv4; the fixed string6for IPv6).addr4-hexandport-hexshould be hex strings,withoutleading0x,of exactly the right length (8 and 4 digits, respectively), beinga pair of hex digits for each byte in the address or port number whenexpressed in host byte order. For example, the port argument is theresult of something likesprintf(arg,%04X,sin.sin_port).addr6-hexshould be a string of 32 hex digits, being a pair for each byte inthe address, in network byte order.

EXIT STATUS

helperwill exit with code 0 on success.

If possible,helperwill return an appropriateerrnovalue as its exit status. If this is not possible it may exit withstatus 255 or with an exit status corresponding toENOSYS(Function not implemented).

ACCESS CONTROL

Seeauthbind(1)for details of the access control regime implemented byhelper.

AUTHOR

authbindand this manpage were written by Ian Jackson. They areCopyright (C)1998,2012by him and released under the GNU General Public Licence; there is NOWARRANTY. See/usr/doc/authbind/copyrightand/usr/doc/copyright/GPLfor details.

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