Fix buffer size issue for AF_NETLINK

Makefile.am

@@ -39,10 +39,11 @@ dist_man_MANS = tnat64.1 tnat64.conf.5 tnat64-validateconf.1
 
 dist_doc_DATA = tnat64.conf.complex.example tnat64.conf.simple.example
 
-export DIG NSLOOKUP NETCAT
+export DIG NSLOOKUP NETCAT PYTHON
 
 export objdir = .libs
-TESTS = tests/01-correct-ipv6-address tests/02-local-connection
+TESTS = tests/01-correct-ipv6-address tests/02-local-connection \
+		tests/03-check-netlink-getsockname
 
 install-exec-hook:
 	cd $(DESTDIR)$(pkglibdir) && \

configure.ac

@@ -352,6 +352,9 @@ fi
 
 
 dnl See if we can run tests
+
+AC_CHECK_PROGS(PYTHON, [python3 python python2.7])
+
 AC_CHECK_PROG(DIG, dig, dig)
 if test -z "$DIG"
 then

tests/01-correct-ipv6-address

@@ -1,5 +1,7 @@
 #!/bin/sh -e
 
+# Test for github bug #1.
+
 if [ -z "$DIG" ] && [ -z "$NSLOOKUP" ]
 then
   exit 77
@@ -16,8 +18,8 @@ else
 fi
 
 TNAT64_DEBUG=10 LD_PRELOAD=$objdir/libtnat64.so $TOOL example.org ${P}0.0.0.0 2>&1 | awk '
-BEGIN { e = 1 }
-/Checking if IPv6 address :: is behind the NAT64.../ { e = 0 }
+BEGIN { e = 0 }
+/Checking if IPv6 address :: is behind the NAT64.../ { e = 1 }
 //
 END { exit e }
 '

tests/03-check-netlink-getsockname

@@ -0,0 +1,30 @@
+#!/bin/sh -e
+
+# Test for github bug #6 - ensure that NETLINK works.
+
+if [ -z "$PYTHON" ]
+then
+  exit 77
+fi
+
+: ${objdir:=.}
+
+TNAT64_DEBUG=10 LD_PRELOAD=$objdir/libtnat64.so $PYTHON << EOF
+
+import sys, socket, traceback
+
+def code():
+    sock = socket.socket(socket.AF_NETLINK, socket.SOCK_RAW)
+    print("sock is " + str(sock))
+
+    try:
+        sockname = sock.getsockname()
+        print("Success: sockname=" + str(sockname))
+        sock.close()
+        return
+    except:
+        traceback.print_exc()
+        sys.exit(42)
+
+code()
+EOF