Add a nix-shell fuzzing file

Signed-off-by: Jeroen Simonetti <jeroen@simonetti.nl>

Makefile.fuzz

@@ -22,7 +22,10 @@ install:
 .PHONY: fuzz
 fuzz:
 	go-fuzz-build -tags gofuzz
-	go-fuzz -bin=./rtnetlink-fuzz.zip -workdir=testdata
+	echo go-fuzz -bin=./rtnetlink-fuzz.zip -workdir=testdata -func FuzzLinkMessage
+	echo go-fuzz -bin=./rtnetlink-fuzz.zip -workdir=testdata -func FuzzAddressMessage
+	echo go-fuzz -bin=./rtnetlink-fuzz.zip -workdir=testdata -func FuzzRouteMessage
+	echo go-fuzz -bin=./rtnetlink-fuzz.zip -workdir=testdata -func FuzzNeighMessage
 
 .PHONY: clean
 clean:

fuzz-shell.nix

@@ -0,0 +1,34 @@
+with import <nixpkgs> { };
+pkgs.mkShell {
+  name = "go-fuzz";
+  buildInputs = [ go ];
+  shellHook = ''
+    function setup() {
+      export GOPATH=$(mktemp -d /tmp/GOPATH.XXXXXX)
+      mkdir -p $GOPATH/src
+      pushd $GOPATH/src
+      go get github.com/dvyukov/go-fuzz/go-fuzz
+      go get github.com/dvyukov/go-fuzz/go-fuzz-build 
+      popd
+    }
+    function teardown() {
+      chmod -R u+w $GOPATH
+      rm -rf $GOPATH
+    }
+    setup
+    trap teardown EXIT
+    alias fuzzbuild="$GOPATH/bin/go-fuzz-build -tags gofuzz"
+    alias fuzzlink="$GOPATH/bin/go-fuzz -bin=./rtnetlink-fuzz.zip -workdir=testdata -func FuzzLinkMessage"
+    alias fuzzaddress="$GOPATH/bin/go-fuzz -bin=./rtnetlink-fuzz.zip -workdir=testdata -func FuzzAddressMessage"
+    alias fuzzroute="$GOPATH/bin/go-fuzz -bin=./rtnetlink-fuzz.zip -workdir=testdata -func FuzzRouteMessage"
+    alias fuzzneigh="$GOPATH/bin/go-fuzz -bin=./rtnetlink-fuzz.zip -workdir=testdata -func FuzzNeighMessage"
+    echo "Fuzz environment ready. There are 5 aliases available:"
+    echo ""
+    echo "fuzzbuild   - will build the fuzzing file"
+    echo "fuzzlink    - will start fuzzing Link Messages"
+    echo "fuzzaddress - will start fuzzing Address Messages"
+    echo "fuzzroute   - will start fuzzing Route Messages"
+    echo "fuzzneigh   - will start fuzzing Neigh Messages"
+    echo ""
+  '';
+}

fuzz.go

@@ -2,14 +2,8 @@
 
 package rtnetlink
 
-func Fuzz(data []byte) int {
-	return fuzzLinkMessage(data)
-	//return fuzzAddressMessage(data)
-	//return fuzzRouteMessage(data)
-	//return fuzzNeighMessage(data)
-}
-
-func fuzzLinkMessage(data []byte) int {
+// FuzzLinkMessage
+func FuzzLinkMessage(data []byte) int {
 	m := &LinkMessage{}
 	if err := (m).UnmarshalBinary(data); err != nil {
 		return 0
@@ -22,7 +16,8 @@ func fuzzLinkMessage(data []byte) int {
 	return 1
 }
 
-func fuzzAddressMessage(data []byte) int {
+// FuzzAddressMessage
+func FuzzAddressMessage(data []byte) int {
 	m := &AddressMessage{}
 	if err := (m).UnmarshalBinary(data); err != nil {
 		return 0
@@ -35,7 +30,8 @@ func fuzzAddressMessage(data []byte) int {
 	return 1
 }
 
-func fuzzRouteMessage(data []byte) int {
+// FuzzRouteMessage
+func FuzzRouteMessage(data []byte) int {
 	m := &RouteMessage{}
 	if err := (m).UnmarshalBinary(data); err != nil {
 		return 0
@@ -48,7 +44,8 @@ func fuzzRouteMessage(data []byte) int {
 	return 1
 }
 
-func fuzzNeighMessage(data []byte) int {
+// FuzzNeighMessage
+func FuzzNeighMessage(data []byte) int {
 	m := &NeighMessage{}
 	if err := (m).UnmarshalBinary(data); err != nil {
 		return 0