Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Re-do r240271:
- Set IP_RECVDSTADDR sockopt on the socket only in case if
it is INADDR_ANY bound.
- Supply IP_SENDSRCADDR control message only if we did receive
IP_RECVDSTADDR control message.

This fixes operation of snmpd bound to a specific local IP address.

PR: bin/171279

For UDP transport set IP_RECVDSTADDR sockopt on the socket, and provide
IP_SENDSRCADDR control with datagram message we reply with. This makes
bsnmpd reply from exactly same address that request was sent to, thus
successfully bypassing stateful firewalls or other kinds of strict checking.

PR: bin/171279

The first part of check_priv() function, that attempts to obtain creds
from the control message, actually never worked. This means check_priv()
didn't work for local dgram sockets.

The SCM_CREDS control messages is received only in two cases:

1) If we did setsockopt(LOCAL_CREDS) on our socket, and in this case
the message is struct sockcred.
2) If sender did supplied SCM_CREDS control message in his sendmsg()
syscall. In this case the message is struct cmsgcred.

We can't rely on 2), so we will use 1) for dgram sockets. For stream
sockets it is more reliable to obtain accept-time credentials, since
SCM_CREDS control message is attached only on first read. Thus:

o Do setsockopt(LOCAL_CREDS) on local dgram sockets.
o Split check_priv() into check_priv_stream() and check_priv_dgram(),
and call them from recv_stream() and recv_dgram() respectively.
o Don't provide space for SCM_CREDS control message in recv_stream().
o Provide space for SCM_CREDS control message in recv_dgram(), but there
is no need to initialize anything in it.
o In recv_dgram() do not blindly expect that first message is SCM_CREDS,
instead use correct search cycle through control messages.

Fully initialize the stack-allocated "struct sockaddr_in sa" structure.

memset() wants the size of the structure to clear, not the size
of the pointer to it.

Submitted by: Pawel Worach

Include sys/queue.h: snmpmod.h uses TAILQ.

PR: bin/153153
MFC after: 2 weeks

Don't spam syslog with "inet_ntop(): Address family not supported
by protocol family" when processing requests received from the
UNIX domain socket.

MFC after: 3 days

Unbreak the build by temprorarily not using include directives in
bsnmpd(1)' def files, until bsd.snmpmod.mk & Makefiles are fixed to
pass proper include path flags to gensnmptree.

Bring in a SNMP module that allows configuration of SNMPv3 Notification targets.

Sponsored by: The FreeBSD Foundation
Reviewed by: philip
Approved by: philip

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@

Remove mention of non-existant -o flag for debugging options.

MFC after: 3 days

Fix two minor typos.

Bump document date after content changes.

Pointy hat to: uqs

Wordsmithing of bsnmpd.1

PR: docs/149157
Submitted by: Warren Block <wblock@wonkity.com>
MFC after: 1 week

mdoc: consistently spell our email addresses <foo@FreeBSD.org>

Reviewed by: ru
Approved by: harti

(S)LIST_HEAD_INITIALIZER takes a (S)LIST_HEAD as an argument.
Fix some wrong usages.
Note: this does not affect generated binaries as this argument is not used.

Approved by: harti@

Fix typo in macro name and macro usage.

Found by: make manlint
Reviewed by: ru
Approved by: harti, philip (mentor)

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