MFC r350635: bsnmp: add asn1 message length validation

admbugs: 780
Submitted by: Guido Vranken, bz
Reported by: Guido Vranken
Approved by: so
Security: CVE-2019-5610

MFC r310648:

style(9): clean up trailing whitespace

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix a problem with OBJECT IDENTIFIER encoding: need to check the
second subid to be less than 40, not the first when the first
subid is 0 or 1.

In bsnmpd(1) add support for SNMPv3 message processing model, including message authentication, packet encryption & view-based access control (RFC 3412, 3414, 3415).

Sponsored by: The FreeBSD Foundation
Reviewed by: philip@ (mostly)
Approved by: philip@

This commit was generated by cvs2svn to compensate for changes in r156066,
which included commits to RCS files with non-trunk default branches.

Virgin import of bsnmpd 1.12

Vendor fix for the build problem of snmp_pf. Move the fallback definitions
for U?INT32_{MAX,MIN} from asn1.h into the .c files that actually require
them (the .h file doesn't refer to these macros).

Virgin import of bsnmpd 1.11

Virgin import of bsnmpd 1.7

Virgin import of bsnmpd 1.5a

Virgin import of bsnmp 1.4