Remove $FreeBSD$: one-line .c pattern

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

dhclient: do not add 0.0.0.0 interface alias.

Subscribers: imp

Differential Revision: https://reviews.freebsd.org/D38908

dhclient: Fix a logic bug remove_protocol().

A logic bug in remove_protocol() meant that it would remove (leak) all
structures in the list preceding the one intended for removal.

PR: 245971
Submitted by: joost@jodocus.org (original version)
MFC after: 1 week

Make dhclient(8) verify if new MTU (option 26) differs from current one and skip unneeded MTU change.
This check eliminates infinite loop of MTU change / link flap / lease verification / MTU change / link flap etc.
in case of some NIC drivers like em(4) or igb(4).

N.B.: obsolete u_int16_t is used in consistency with the rest of the file.

PR: 229432
Approved by: mav (mentor)
MFC after: 1 week

dhclient: build with WARNS=6

- add static in a number of places
- initialize __progname rather than rely on magical extern values
- use nitems() instead of manually spelling it out
- unshadow 'idi'
- teach 'error' that it is '__dead2'
- add missing 'break'

dhclient: raise WARNS to 4

Mostly const-correctness fixes. There were also some variable-shadowing,
unused variable, and a couple of sockaddr type-correctness changes. I also had
trouble with cast-align warnings. I was able to prove that one of them was a
false positive. But ultimately I had to disable the warning program-wide to
deal with the others.

Reviewed by: cem
MFC after: 3 weeks
Sponsored by: Spectra Logic Corp
Differential Revision: https://reviews.freebsd.org/D14460

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

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.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Use syslog service in dhclient(8).

dhclient(8) is failing during boot to connect to the syslog service, because
syslog daemon is started after dhclient(8). This can be reproduced by stooping
syslog daemon and ktrace the dhclient or use kern.trap_enotcap sysctl and boot
the machine. Using the Casper syslog service fix the problem.

Reviewed by: bapt@
Differential Revision: https://reviews.freebsd.org/D12825

Remove dead code in dhclient(8)

The offending code has been dead ever since the import from OpenBSD in
r195805. OpenBSD later deleted that entire function.

Reported by: Coverity
CID: 500059
MFC after: 4 weeks
Sponsored by: Spectra Logic Corp

Allocate a struct ifreq rather than using a (wrong) computed size for
the BIOCSETIF ioctl.

The kernel always copies an entire struct ifreq and IPv4 addresses will
always fit in an ifreq.

On systems with pointers larger than 64-bits, the computed size will be
less than the size of struct ifreq, potentially resulting in the kernel
attempting to copyin memory from outside the allocation.

Reviewed by: jhb
Obtained from: CheriBSD
MFC after: 1 week
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D8445

dhclient: add support for interface-mtu (26)

Make dhclient set interface MTU if it was provided.

This version implements MTU setting in dhclient itself before it runs
dhclient-script.

PR: 206721
Submitted by: novel@
Reported by: Jarrod Petz <jlpetz at gmail.com>
Reviewed by: cem, allanjude
Differential Revision: https://reviews.freebsd.org/D5675

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.

Fix the logic to count the number of "live interfaces". With this change
dhclient now terminates when the underlying ifnet is destroyed (e.g.
on card eject).

Reviewed by: brooks
Approved by: re (kib)

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

Teach dhclient(8) about net80211 link (association) status.

Reviewed by: brooks
MFC after: 3 days

Add __FBSDID to all .c files in dhclient to aid in determining file
versions when dealing with user problems.

Import the OpenBSD dhclient as shipped with OpenBSD-3.7 (the tag
OPENBSD_3_7).