add source and sourcefromlast fuzzers

Signed-off-by: Sepehrdad Sh <[email protected]>

fuzz/fuzz_targets/FuzzSource.go

@@ -0,0 +1,29 @@
+//go:build gofuzz
+// +build gofuzz
+
+package fuzz
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/zalando/skipper/predicates/source"
+)
+
+func FuzzSource(data []byte) int {
+	p, err := source.New().Create([]interface{}{string(data)})
+
+	if err != nil {
+		return 0
+	}
+
+	if !p.Match(&http.Request{RemoteAddr: string(data)}) {
+		panic(fmt.Sprintf("Source predicate match failed: %x\n", data))
+	}
+
+	if !p.Match(&http.Request{RemoteAddr: string(data), Header: http.Header{"X-Forwarded-For": []string{string(data)}}}) {
+		panic(fmt.Sprintf("Source predicate with xff match failed: %x\n", data))
+	}
+
+	return 1
+}

fuzz/fuzz_targets/FuzzSourceFromLast.go

@@ -0,0 +1,29 @@
+//go:build gofuzz
+// +build gofuzz
+
+package fuzz
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/zalando/skipper/predicates/source"
+)
+
+func FuzzSourceFromLast(data []byte) int {
+	p, err := source.NewFromLast().Create([]interface{}{string(data)})
+
+	if err != nil {
+		return 0
+	}
+
+	if !p.Match(&http.Request{RemoteAddr: string(data)}) {
+		panic(fmt.Sprintf("SourceFromLast predicate match failed: %x\n", data))
+	}
+
+	if !p.Match(&http.Request{RemoteAddr: string(data), Header: http.Header{"X-Forwarded-For": []string{string(data)}}}) {
+		panic(fmt.Sprintf("SourceFromLast predicate with xff match failed: %x\n", data))
+	}
+
+	return 1
+}