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Editing File: /usr/share/doc/libwrap0/README.Debian

tcp_wrappers for Debian
-----------------------

Extensions:
-----------

There are a number of Debian specific changes to TCP wrappers:

* libwrap.so.0 is available for dynamic linking.

* You can blacklist a whole bunch of hosts at once by specifying a
      file that contains a list of those hosts instead of just naming
      a host. See the hosts_access(5) manpage.

* You can allow or disallow access to a service depending on the
      exit status of a program. See the hosts_access(5) manpage.

* CIDR support in hosts_access(5) functions.

* %r and %R parameters in hosts_access(5) functions.

* Servers can be matched by port number other than by process name.

* IPv6 support.

Library versioning:
-------------------

TCP wrappers isn't distributed as a shared library upstream, so the
versioning scheme used for TCP wrappers may not match Linux's library
versioning scheme. Hence, libwrap has a soname of libwrap0 (version 7.6),
instead of libwrap7 (version 6).

Build options:
--------------

STYLE		= "-DPROCESS_OPTIONS -DACLEXEC"

Debian TCP Wrappers use the extended syntax for /etc/hosts.allow
	and /etc/hosts.deny. This particularly affects spawning other
	commands on connections, see the hosts_options(5) manpage for
	more details.

FACILITY	= LOG_DAEMON
SEVERITY	= LOG_INFO

TCP Wrappers logs as daemon.info (rather than mail.info).

BUGS		=

Linux has no bugs. :)

VSYSLOG		=

libc6 has vsyslog built in.

UMASK		= -DDAEMON_UMASK=022
NETGROUP	= -DNETGROUP

RFC931_TIMEOUT	= 10
ACCESS		= -DHOSTS_ACCESS
TABLES		= -DHOSTS_DENY=\"/etc/hosts.deny\" -DHOSTS_ALLOW=\"/etc/hosts.al
low\"
KILL_OPT	= -DKILL_IP_OPTIONS

EXTRA_CFLAGS="-DSYS_ERRLIST_DEFINED -DHAVE_STRERROR -DHAVE_WEAKSYMS -DINET6=1 -Dss_family=__ss_family -Dss_len=__ss_len"

The options ALWAYS_RFC931, ALWAYS_HOSTNAME and PARANOID have not been
enabled because these features can be enabled at runtime. The option
APPEND_DOT is not enabled because of compatibility reasons.

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