lib: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

Forward Reply-Message attributes to the user, unless suppressed by the
new no_reply_message option.

MFC after: 1 week
Sponsored by: The University of Oslo

lib: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

If PAM_RHOST is non-NULL, pass it in the Calling-Station-ID attribute of
the RADIUS access request.

MFC after: 1 week

Remove unnecessary #include.

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.

Send not only Access Request, but also Access Challenge with defined
NAS-Identifier and NAS-IP-Address.

Reviewed by: bz
MFC after: 1 month

Don't use a cast as an lvalue.
Add a redundant test to make it painfully obvious to the reader that this
code does not support IPv6.

Approved by: re (dwhite)
MFC after: 1 week

Revert the last change. There are more 64bit platforms than amd64, and
they break due to diferent alignment restrictions.

Remove the use of cast as lvalue.

Fix strict aliasing breakage in PAM modules (except pam_krb5, which needs
more work than the others). This should make most modules build with -O2.

Fix on sparc64.

Reported by: rwatson/tinderbox
MFC after: 2 weeks

Add a new configuration variable - nas_ipaddr, which if set allows to
set NAS-IP-Address attribute in requests generated by the pam_radius
module. This attribute is mandatory for some Radius servers out there.

Reviewed by: des
MFC after: 2 weeks

Revert previous commit after fixing libpam.

Add a __DECONST() to unbreak the build.

Update copyright dates.

Remove all instances of pam_std_option()

Allow the admin to specify a different NAS identifier than the hostname.

Submitted by: Boris Kovalenko <boris@ntmk.ru>

Major cleanup:

- add __unused where appropriate
- PAM_RETURN -> return since OpenPAM already logs the return value.
- make PAM_LOG use openpam_log()
- make PAM_VERBOSE_ERROR use openpam_get_option() and check flags
for PAM_SILENT
- remove dummy functions since OpenPAM handles missing service
functions
- fix various warnings

Sponsored by: DARPA, NAI Labs

Aggressive cleanup of warnings + authtok-related code in preparation for
PAMifying passwd(1).

Sponsored by: DARPA, NAI Labs.

NAI DBA update.

Switch to OpenPAM. Bump library version. Modules are now versioned, so
applications linked with Linux-PAM will still work.
Remove pam_get_pass(); OpenPAM has pam_get_authtok().
Remove pam_prompt(); OpenPAM has pam_{,v}{error,info,prompt}().
Remove pam_set_item(3) man page as OpenPAM has its own.

Sponsored by: DARPA, NAI Labs

#include cleanup.

Sponsored by: DARPA, NAI Labs

WARNS=4 fixes. Protect with NO_WERROR for the modules that have
warnings that are hard to fix or that I've been asked to leave alone.

Add dummy functions for all module types. These dummies return PAM_IGNORE
rather than PAM_SUCCESS, so you'll get a failure if you list dummies but
no real modules for a particular module chain.

Sponsored by: DARPA, NAI Labs

Add __FBSDID()s to libpam

Verbose logging, overridable verbose error reporting.

Clean up (and in some cases write) the PAM mudules, using
o The new options-processing API
o The new DEBUG-logging API

Add man(1) pages for ALL modules. MDOC-Police welcome
to check this.

Audit, clean up while I'm here.

Make it possible to use PAM in statically-linked applications.

Build structure for contribified Linux-PAM, plus some home-grown
modules for FreeBSD's standard authentication methods. Although
the Linux-PAM modules are present in the contrib tree, we don't
use any of them.

The main library "libpam" is composed of sources taken from three
places. First are the standard Linux-PAM libpam sources from the
contrib tree. Second are the Linux-PAM "libpam_misc" sources, also
from the contrib tree. In Linux these form a separate library.
But as Mike Smith pointed out to me, that seems pointless, so I
have combined them into the libpam library. Third are some additional
sources from the "src/lib/libpam" tree with some common functions
that make it easier to write modules. Those I wrote myself.

This work has been donated to FreeBSD by Juniper Networks, Inc.