pf tests: add a basic snmp_pf test case

Event:		Tokyo Hackathon 202503
(cherry picked from commit c849f533326026501c28cb2c344b16723862551a)

tests/sys/netpfil/pf/Makefile

@@ -38,6 +38,7 @@ ATF_TESTS_SH+=	altq \
 		sctp \
 		set_skip \
 		set_tos \
+		snmp \
 		src_track \
 		syncookie \
 		synproxy \
@@ -54,7 +55,9 @@ TEST_METADATA+= execenv_jail_params="vnet allow.raw_sockets"
 
 PROGS=	divapp
 
-${PACKAGE}FILES+=	CVE-2019-5597.py \
+${PACKAGE}FILES+=	\
+			bsnmpd.conf \
+			CVE-2019-5597.py \
 			CVE-2019-5598.py \
 			daytime_inetd.conf \
 			echo_inetd.conf \
@@ -69,6 +72,7 @@ ${PACKAGE}FILES+=	CVE-2019-5597.py \
 			rdr-srcport.py \
 			utils.subr
 
+${PACKAGE}FILESMODE_bsnmpd.conf=		0555
 ${PACKAGE}FILESMODE_CVE-2019-5597.py=	0555
 ${PACKAGE}FILESMODE_CVE-2019-5598.py=	0555
 ${PACKAGE}FILESMODE_fragcommon.py=	0555

tests/sys/netpfil/pf/bsnmpd.conf

@@ -0,0 +1,47 @@
+location := "A galaxy far, far away"
+contact := "skywalker@Tatooine"
+system := 1
+
+read := "public"
+write := "geheim"
+trap := "mytrap"
+
+NoAuthProtocol		:= 1.3.6.1.6.3.10.1.1.1
+HMACMD5AuthProtocol	:= 1.3.6.1.6.3.10.1.1.2
+HMACSHAAuthProtocol	:= 1.3.6.1.6.3.10.1.1.3
+NoPrivProtocol		:= 1.3.6.1.6.3.10.1.2.1
+DESPrivProtocol		:= 1.3.6.1.6.3.10.1.2.2
+AesCfb128Protocol	:= 1.3.6.1.6.3.10.1.2.4
+
+securityModelAny	:= 0
+securityModelSNMPv1	:= 1
+securityModelSNMPv2c	:= 2
+securityModelUSM	:= 3
+
+MPmodelSNMPv1		:= 0
+MPmodelSNMPv2c		:= 1
+MPmodelSNMPv3		:= 3
+
+noAuthNoPriv := 1
+authNoPriv := 2
+authPriv := 3
+
+%snmpd
+begemotSnmpdDebugDumpPdus	= 2
+begemotSnmpdDebugSyslogPri	= 7
+
+begemotSnmpdCommunityString.0.1	= $(read)
+begemotSnmpdCommunityDisable	= 1
+
+begemotSnmpdTransInetStatus.1.4.0.0.0.0.161.1 = 4
+begemotSnmpdTransInetStatus.2.16.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.161.1 = 4
+
+begemotSnmpdLocalPortStatus."/var/run/snmpd.sock" = 1
+begemotSnmpdLocalPortType."/var/run/snmpd.sock" = 4
+
+sysContact	= $(contact)
+sysLocation	= $(location)
+sysObjectId 	= 1.3.6.1.4.1.12325.1.1.2.1.$(system)
+
+begemotSnmpdModulePath."mibII"	= "/usr/lib/snmp_mibII.so"
+begemotSnmpdModulePath."pf"	= "/usr/lib/snmp_pf.so"

tests/sys/netpfil/pf/snmp.sh

@@ -0,0 +1,71 @@
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2025 Kristof Provost <kp@FreeBSD.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+
+. $(atf_get_srcdir)/utils.subr
+
+atf_test_case "basic" "cleanup"
+basic_head()
+{
+	atf_set descr 'Basic pf_snmp test'
+	atf_set require.user root
+}
+
+basic_body()
+{
+	pft_init
+
+	epair=$(vnet_mkepair)
+
+	ifconfig ${epair}b 192.0.2.2/24 up
+
+	vnet_mkjail alcatraz ${epair}a
+	jexec alcatraz ifconfig ${epair}a 192.0.2.1/24 up
+
+	# Start bsnmpd
+	jexec alcatraz bsnmpd -c $(atf_get_srcdir)/bsnmpd.conf
+
+	jexec alcatraz pfctl -e
+	pft_set_rules alcatraz \
+	    "pass"
+
+	# Sanity check, and create state
+	atf_check -s exit:0 -o ignore \
+	    ping -c 1 192.0.2.1
+
+	# pf should be enabled
+	atf_check -s exit:0 -o match:'pfStatusRunning.0 = true' \
+	    bsnmpwalk -s public@192.0.2.1 -i pf_tree.def begemot
+}
+
+basic_cleanup()
+{
+	pft_cleanup
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case "basic"
+}