MFC r345763:
Correct a port number assignment.

PR: 236930

MFC r328160:
Add to bsnmpd(1) ability to specify multiple community strings with
different access rights.

By default there are two community strings with index 1 and 2, one for
read-only access and second for read-write access:

begemotSnmpdCommunityString.0.1 = $(read)
begemotSnmpdCommunityString.0.2 = $(write)

Now it is possible to define additional community strings using different
indexes:

begemotSnmpdCommunityString.0.3 = "SomeString1"
begemotSnmpdCommunityPermission.0.3 = 1
begemotSnmpdCommunityString.0.4 = "SomeString2"
begemotSnmpdCommunityPermission.0.4 = 2
begemotSnmpdCommunityString.0.5 = "SomeString3"
begemotSnmpdCommunityString.0.6 = "SomeString4"

New attribute begemotSnmpdCommunityPermission can be used to specify access
rights: 1 means "read-only" access, 2 means "read-write" access. If
attribute is not specified for some index this means "read-only" rights.

Community strings must be unique, i.e. must not be the same for different
indexes.

Obtained from: Yandex LLC
Sponsored by: Yandex LLC
Differential Revision: https://reviews.freebsd.org/D13785

MFC r328171:
Rename "index" variable to "idx" since gcc complains that it shadows
index(3) function declaration.

MFC r326510:
Fix format string warning with enabled DEBUGGING.

MFC r315206:

bsnmpd: fix segfault when trans_insert_port(..) is called with multiple
out of order addresses

Move `port->transport` initialization before the TAILQ_FOREACH(..) loop
to ensure that the value is properly initialized before it's inserted
into the TAILQ.

PR: 217760

MFC r312331:
r312331 (by glebius):

Fix regression from r310655, which broke operation of bsnmpd if it is bound
to a non-wildcard address. As documented in ip(4), doing sendmsg(2) with
IP_SENDSRCADDR on a socket that is bound to non-wildcard address is
completely different to using this control message on a wildcard one.

A fix is to add a bool to mark whether we did setsockopt(IP_RECVDSTADDR)
on the socket, and use IP_SENDSRCADDR control message only if we did.

While here, garbage collect absolutely useless udp_recv() function that
establishes some structures on stack to never use them later.

MFC r310656,r311221:

r310656:

style(9): sort alignment in udp_recv(..)

r311221:

Initialize msg.msg_flags to 0

This mutes a valid coverity warning about it being uninitialized
when passed in to sendmsg(2).

CID: 1368202

MFC r310655:

Fix bsnmpd sending/receiving with multi-homed configurations or INADDR_ANY used
as the listening address in snmpd_input(..)

Stash the IPv4 address of the receiver via the recv(..) callback and use it in
the send(..) callback for the transport by specifying IP_SENDSRCADDR for the
control message type.

Add sendmsg logic to the UDP transport's send(..) callback and use the
respective send(..) callback for the transport instead of calling sendto in
snmpd_input(..).

Obtained from: Isilon OneFS (^/onefs/branches/BR_8_0_0_DEV@r507595)

MFC r311759,r311760:

r311759:

Add a REVISION section to track changes for the FOKUS-MIB MIB file

There haven't been any changes to the MIB definition, so the REVISION
remains static at the version it was imported at

r311760:

Add a REVISION section to track changes for the BEGEMOT-MIB MIB file

There haven't been any changes to the MIB definition, so the REVISION
remains static at the version it was imported at

MFC r311381:

lsock_init_port: address issues with initializing sockaddr_un object

- Use strlcpy to ensure p->name doesn't overflow sa.sun_path [*].
- Use SUN_LEN(..) instead of spelling out calculation longhand (inspired
by comment by jmallett).

Tested with: dgram and stream support with both bsnmpwalk and snmpwalk

CID: 1006825

MFC r310586,r310587,r310588:

r310586:

Refactor transport sources a bit to facilitate changes coming down pipeline

Add recv callback to transport layer to better facilitate code reuse and
readability and for symmetry with send callback. Move recv_dgram and
recv_stream to udp_recv and lsock_recv, respectively, and make the
beforementioned functions recv callbacks for the udp and lsock transports,
respectively.

Consolidate the check_priv* functions in their relevant trans*.c source to
limit scope/use.

Note: this code is roughly based content from the submitter, although this
was modified to be more of a direct move from snmpd/main.c to the trans_*.c
sources, and to reduce unnecessary static function declarations.

r310587:

Fix definition for recv_dgram(..); it should be "ssize_t", not "int"

I'm not sure why this wasn't flagged as an issue by the compiler, yet

r310588:

Fix return type for `ret` (recv callback) and sort variables by alignment

Again, for reasons I don't yet understand, this is not being flagged by the
compiler. Unlike the issue addressed in r310587, this problem existed prior
to r310586

MFC r311378:

lm_load: fix string copying issues

- Ensure `section` doesn't overrun section by using strlcpy instead of
strcpy [*].
- Use strdup instead of malloc + strcpy (this wasn't flagged by Coverity,
but is an opportunistic change).

CID: 1006826 [*]

MFC r311382:

Use calloc instead of malloc + memset(.., 0, ..)

MFC r310957,r310958,r310960:

r310957:

Use strlcpy when copying `com` to pdu->community to avoid potential
buffer overruns

CID: 1006823, 1006824

r310958:

Initialize ret to SNMPD_INPUT_OK at the top of snmp_input_start(..) to
avoid returning an uninitialized value

There are some really complicated, snakey if-statements combined with
switch statements that could result in an invalid value being returned
as `ret`

CID: 1006551

r310960:

Similar to r310954, set .len to 0 on malloc failure and to `len` only
on success

MFC r310763:

Use uint32_t instead of u_int32_t for or_last_change and services in "struct systemg"

This is being done to match "struct systemg" in snmpmod(3)

No functional change

MFC r310498,r310591:

r310498:

Allow SNMPv3 authNoPriv and noAuthNoPriv protocols to discover snmpEngineTime
as discussed in RFC-5343

This fixes interoperability with net-snmp.

Tested with the following invocations of snmpwalk (from net-snmp):

- noAuthNoPriv:

% snmpwalk -v 3 -n '' -u public localhost snmpEngineTime

- authNoPriv:

% snmpwalk -v 3 -n '' -u bsnmp -A bsnmptest -l authNoPriv -a sha localhost \
localhost snmpEngineTime

- authPriv:

% snmpwalk -v 3 -n '' -u bsnmp -A bsnmptest -l authPriv -a sha -x des \
-X bsnmptest localhost snmpEngineTime

Obtained from: Isilon OneFS (5ec6d772cacbc, with minor tweaks)

r310591:

Update engine time using update_snmpd_engine_time(..)

MFC r310662,r310663:

r310662:

style(9): snmp_send_packet(..): fix whitespace

r310663:

style(9): ip_get(..): clean up whitespace

MFC r310648:

style(9): clean up trailing whitespace

MFC r310455:

Clarify failure in snmp_output(..) with call to snmp_pdu_decode

- Explicitly test snmp_pdu_encode against SNMP_CODE_OK instead of assuming
any non-zero value is bad.
- Print out the code before calling abort() to give the end-user something
actionable to debug without having to recompile the binary, since the
core might not have these details.

MFC r310574:

Fix style(9)

- Sort #includes
- Delete trailing whitespace

No functional change

MFC r310592:

style(9): fix trailing whitespace

MFC r310459:

Sort #includes per style(9)

No functional change

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

Revert r299830, it has couple of fatal errors.

The CMSG_ family of macros take care of alignment, so we don't need r299830
at all, even if it was correct. Put NO_WCAST_ALIGN into Makefile.

Together with: peter

Fix .Dd

Today is the 14th, not the 10th of May

Reported by: igor (derp)
Sponsored by: EMC / Isilon Storage Division

Fix fully canonicalized example for `myvariable.27...`

`6` doesn't occur in the OID; it was spurious

Bump .Dd for the change

MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division

Remove trailing whitespace in license tort

MFC after: 1 week
Reported by: igor
Sponsored by: EMC / Isilon Storage Division

Fix -Wcast-align warnings

Use memcpy instead of using direct assignment of void* pointers with
CMSG_DATA(..), which changes alignment

MFC after: 3 weeks
Reported by: clang
Sponsored by: EMC / Isilon Storage Division

Use SNMPD_INPUT_FAILED instead of SNMP_CODE_FAILED

SNMPD_INPUT_FAILED is `enum snmpd_input_err` type (which matches the return
code from the function). SNMP_CODE_FAILED is `enum snmp_code` type.

MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division

Replace QUADFMT with %ju and QUADXFMT with %jx and cast values with uintmax_t

This will cure some -Wformat warnings

MFC after: 1 week
Reported by: clang, gcc
Sponsored by: EMC / Isilon Storage Division

bsnmpd: Fix size of trapsink::comm to match other community arrays

This fixes a number of possible strcpy() buffer overruns between the various
community strings in trap.c.

Reported by: Coverity
CIDs: 1006820, 1006821, 1006822
Sponsored by: EMC / Isilon Storage Division

Use `sizeof(*uuser)` instead of `sizeof(struct usm_user)` for consistency with
the rest of the users in the file

No functional change

MFC after: 3 days
Sponsored by: EMC / Isilon Storage Division

Don't leak `string` in parse_define(..) when a macro has been found
and the parser token != TOK_ASSIGN

MFC after: 1 week
CID: 1007187, 1007188
Reported by: Coverity
Obtained from: Isilon OneFS (part of r445479)
Submitted by: Miles Ohlrich <miles.ohlrich@isilon.com>
Sponsored by: EMC / Isilon Storage Division

Staticize several variables that are used exclusively in bsnmpd/main.c and
bsnmpd/trap.c

This fixes several -Wmissing-variable-declaration warnings noted by clang

Differential Revision: https://reviews.freebsd.org/D4718
MFC after: 1 week
Reported by: Jenkins
Reviewed by: araujo
Sponsored by: EMC / Isilon Storage Division

Remove unused function `act_getkernstring`

This fixes a clang -Wunused warning

Differential Revision: https://reviews.freebsd.org/D4697
MFC after: 1 week
Reported by: Jenkins
Reviewed by: araujo, bapt
Sponsored by: EMC / Isilon Storage Division

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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