tcp_wrappers: Use ANSI (c89) function definitions

Although this code is in contrib/ there is no active upstream.

Reviewed by: brooks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D36047

Remove a duplicate global (rfc931_timeout).

It is declared here and in rfc931.c and unused here so keep that copy
and discard this one.

Obtained from: CheriBSD
MFC after: 1 week
Sponsored by: DARPA, AFRL

Use headers instead of manual declerations of standard functions and
variables.

remove bogus declaration of malloc from tcp_wrappers

The declaration was already inactive when INET6 was enabled
and it causes a build error in the other case because of
a conflict with the correct definition in stdlib.h.

Discussed with: dim, ume
MFC after: 2 weeks

TCP Wrappers: tcpdchk (tcp wrapper configuration checker) and tcpdmatch
(tcp wrapper oracle) warning fixes via edits to the C code files

contrib/tcp_wrappers/fakelog.c
Warnings for each of functions: openlog( ), vsyslog( ), VARARGS( ),
closelog( )
warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
warning: control reaches end of non-void function [-Wreturn-type]
Fixes:
Explicitly added specification of function type to void for each
function, suppressing both warnings for each function listed
contrib/tcp_wrappers/inetcf.c
Warnings:
warning: incompativle redeclaration of library function 'malloc'
note: 'malloc' is a builtin with type 'void *(unsigned long)'
warning: implicit declaration of function 'check_path' is invalid in C99
[-Wimplicit-function-declaration]
Fixes:
Removed redeclaration of malloc on line 21
Included library <stdlib.h> in the code which contains the malloc( )
function in it's library
Included scaffold.h header file in the code that contains check-path( )
function
contrib/tcp_wrappers/scaffold.c
Warnings:
warning: implicitly declaring library function 'exit' with type
'void (int) __attribute__((noreturn))' [-Wimplicit-function-declaration]
note: include the header <stdlib.h> or explicitly provide a declaration
for 'exit'
Fixes:
Included <stdlib.h> in the code which contains the exit( ) function in
it's library
contrib/tcp_wrappers/tcpdchk.c
Warnings:
warning: implicit declaration of function 'getopt' is invalid
in C99 [-Wimplicit-function-declaration]
warning: implicit declaration of function 'atoi' is invalid
in C99 [-Wimplicit-function-declaration]
Fixes:
Included the specific function <getopt.h> library to the code
Included<stdlib.h> to the code which contains the atoi( ) function in
the library
contrib/tcp_wrappers/tcpdmatch.c
Warnings:
warning: implicit declaration of function 'getopt' is invalid in C99
[-Wimplicit-function-declaration]
Fixes:
Included<stdlib.h> to the code which contains the getopt( ) function in
the library

Submitted by: Aaron Prieger <aprieger@llnw.com>
Reviewed by: vangyzen
Sponsored by: Limelight Networks
Differential Revision: https://reviews.freebsd.org/D10995

Put proper prototypes in tcpd.h

Clang 4.0.0 complains about tcpd.h's not-really-prototypes, e.g.:

/usr/include/tcpd.h:75:24: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
extern int hosts_access(); /* access control */
^

To fix this, turn these declarations into real prototypes. While here,
garbage collect the incompatible rfc931() function from scaffold.c, as
it is never used.

Reviewed by: emaste
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D9052

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

Add IPv6 scoped address support.
It enables us to control link-local connections by interface like
this:

ALL : [fe80::%ed0]/10 : allow
ALL : [fe80::]/10 : deny

Missing tcp_wrapper IPv6 support seemed to be a bug, so commit it.

Now when tcp_wrapper is enabled by inetd -wW,
several accesses which should be permitted are refused only for IPv6,
if hostname is used to decide the host to be allowed.
IPv6 users will be just upset.

About security related concern.
-All extensions are wrapped by #ifdef INET6, so people can completely
disable the extension by recompile libwrap without INET6 option.
-Access via IPv6 is not enabled by default.
People need to enable IPv6 access by changing /etc/inetd.conf at first,
by adding tcp6 and/or tcp46 entries.
-The base of patches are from KAME package and are actually daily used
for more than a year in several Japanese IPv6 environments.
-Patches are reviewed by markm.

Approved by: jkh

Submitted by: Hajimu UMEMOTO <ume@mahoroba.org>
Reviewed by: markm
Obtained from: KAME project

Clean import of TCP-wrappers by Wietse Venema.
Rest of build to follow.