pf tests: Move Sniffer to its own file

Make it easier to re-use the sniffer class in other test support
scripts.

(cherry picked from commit d1805f60afc3f3c65f5d2bb360ed1ab55ea705da)

3 files changed, 27 insertions, 22 deletions

diff --git a/tests/sys/netpfil/pf/Makefile b/tests/sys/netpfil/pf/Makefile
index 9bb40b911d4c..115a38666cc7 100644
--- a/tests/sys/netpfil/pf/Makefile
+++ b/tests/sys/netpfil/pf/Makefile
@@ -22,6 +22,7 @@ ATF_TESTS_SH+=	anchor \
 
 ${PACKAGE}FILES+=	utils.subr \
 			echo_inetd.conf \
+			sniffer.py \
 			pft_ping.py \
 			CVE-2019-5597.py
 
diff --git a/tests/sys/netpfil/pf/pft_ping.py b/tests/sys/netpfil/pf/pft_ping.py
index 0b70c2235894..e77d0835134f 100644
--- a/tests/sys/netpfil/pf/pft_ping.py
+++ b/tests/sys/netpfil/pf/pft_ping.py
@@ -3,31 +3,10 @@
 import argparse
 import scapy.all as sp
 import sys
-import threading
+from sniffer import Sniffer
 
 PAYLOAD_MAGIC = 0x42c0ffee
 
-class Sniffer(threading.Thread):
-	def __init__(self, args, check_function):
-		threading.Thread.__init__(self)
-
-		self._args = args
-		self._recvif = args.recvif[0]
-		self._check_function = check_function
-		self.foundCorrectPacket = False
-
-		self.start()
-
-	def _checkPacket(self, packet):
-		ret = self._check_function(self._args, packet)
-		if ret:
-			self.foundCorrectPacket = True
-		return ret
-
-	def run(self):
-		self.packets = sp.sniff(iface=self._recvif,
-				stop_filter=self._checkPacket, timeout=3)
-
 def check_ping_request(args, packet):
 	if args.ip6:
 		return check_ping6_request(args, packet)
diff --git a/tests/sys/netpfil/pf/sniffer.py b/tests/sys/netpfil/pf/sniffer.py
new file mode 100644
index 000000000000..c71f6e1f5729
--- /dev/null
+++ b/tests/sys/netpfil/pf/sniffer.py
@@ -0,0 +1,25 @@
+# $FreeBSD$
+
+import threading
+import scapy.all as sp
+
+class Sniffer(threading.Thread):
+	def __init__(self, args, check_function):
+		threading.Thread.__init__(self)
+
+		self._args = args
+		self._recvif = args.recvif[0]
+		self._check_function = check_function
+		self.foundCorrectPacket = False
+
+		self.start()
+
+	def _checkPacket(self, packet):
+		ret = self._check_function(self._args, packet)
+		if ret:
+			self.foundCorrectPacket = True
+		return ret
+
+	def run(self):
+		self.packets = sp.sniff(iface=self._recvif,
+				stop_filter=self._checkPacket, timeout=3)