Implement sending multicast UDP packets.

Makefile

@@ -22,43 +22,71 @@ udpbench-${VERSION}.tar.gz:
 
 CLEANFILES+=	out
 
-.PHONY: test test-localhost test-localhost6 test-mmsg test-repeat
-test: test-localhost test-localhost6 test-mmsg test-repeat
-
+TEST =
+TEST += localhost
 test-localhost:
 	@echo '\n==== $@ ===='
-	./udpbench -p0 -t3 recv 127.0.0.1 >out & \
+	./udpbench -p0 -t3 recv 127.0.0.1 | tee out & \
 	    sleep 1; \
 	    port=`awk '/^sockname:/{print $$3}' out`; \
 	    ./udpbench -p$$port -t1 send 127.0.0.1 || exit 1; \
 	    wait $$!
 	grep '^recv:' out
 
+TEST += localhost6
 test-localhost6:
 	@echo '\n==== $@ ===='
-	./udpbench -p0 -t3 recv ::1 >out & \
+	./udpbench -p0 -t3 recv ::1 | tee out & \
 	    sleep 1; \
 	    port=`awk '/^sockname:/{print $$3}' out`; \
 	    ./udpbench -p$$port -t1 send ::1 || exit 1; \
 	    wait $$!
 	grep '^recv:' out
 
+TEST += mmsg
 test-mmsg:
 	@echo '\n==== $@ ===='
-	./udpbench -m1024 -p0 -t3 recv 127.0.0.1 >out & \
+	./udpbench -m1024 -p0 -t3 recv 127.0.0.1 | tee out & \
 	    sleep 1; \
 	    port=`awk '/^sockname:/{print $$3}' out`; \
 	    ./udpbench -m1024 -p$$port -t1 send 127.0.0.1 || exit 1; \
 	    wait $$!
 	grep '^recv:' out
 
+TEST += repeat
 test-repeat:
 	@echo '\n==== $@ ===='
-	./udpbench -N1 -p0 -t3 recv 127.0.0.1 >out & \
+	./udpbench -N1 -p0 -t3 recv 127.0.0.1 | tee out & \
 	    sleep 1; \
 	    port=`awk '/^sockname:/{print $$3}' out`; \
 	    ./udpbench -N1 -p$$port -t1 send 127.0.0.1 || exit 1; \
 	    wait $$!
 	grep '^recv:' out
 
+TEST += mcast
+test-mcast:
+	@echo '\n==== $@ ===='
+	./udpbench -I127.0.0.1 -p0 -t3 recv 224.0.0.123 | tee out & \
+	    sleep 1; \
+	    port=`awk '/^sockname:/{print $$3}' out`; \
+	    ./udpbench -I127.0.0.1 -L1 -T0 -p$$port -t1 \
+	    send 224.0.0.123 || exit 1; \
+	    wait $$!
+	grep -q 'sockname: 224.0.0.123 ' out
+
+TEST += mcast-repeat
+test-mcast-repeat:
+	@echo '\n==== $@ ===='
+	./udpbench -N2 -I127.0.0.1 -p0 -t3 recv 224.0.0.123 | tee out & \
+	    sleep 1; \
+	    port=`awk '/^sockname:/{print $$3}' out | sort -u`; \
+	    ./udpbench -N2 -I127.0.0.1 -L1 -T0 -p$$port -t1 \
+	    send 224.0.0.123 || exit 1; \
+	    wait $$!
+	grep -q 'sockname: 224.0.0.123 ' out
+	grep -q 'sockname: 224.0.0.124 ' out
+
+.PHONY: ${TEST:S/^/test-/}
+test: ${TEST:S/^/test-/}
+
 .include <bsd.prog.mk>