Added verifying support

README.md

@@ -8,9 +8,9 @@ Blink is a DNS bruteforcer made in Go
 ## Features
 <!--
 + ENT (Empty non-terminal)
-+ Verifying query
 -->
 + UDP query
++ Verifying query
 + IPv4/IPv6 support
 + Wildcard detection
 

v1/cmd/blink/main.go

@@ -210,6 +210,7 @@ func init() {
 	rootCmd.Flags().BoolVarP(&opts.IPv6, "ipv6", "i", false, "Query for IPv6")
 	rootCmd.Flags().BoolVarP(&wildcard, "wildcard", "d", false, "Query for wildcard")
 	rootCmd.Flags().IntVarP(&opts.Timeout, "timeout", "t", 5, "Query timeout")
+	rootCmd.Flags().BoolVarP(&opts.Verify, "verify", "y", false, "Verify query")
 	rootCmd.Flags().IntVarP(&opts.Threads, "threads", "c", 1, "Concurrent threads")
 	rootCmd.Flags().BoolVarP(&verbose, "verbose", "v", false, "Verbose logging")
 

v1/pkg/dns/dns.go

@@ -11,6 +11,7 @@ import (
 type Query struct {
 	Client    *dns.Client    // DNS client
 	IPv6      bool           // IPv6 mode
+	Verify    bool           // Verify mode
 	Resolvers []string       // Target resolvers
 	Domain    string         // Target domain
 	Subdomain string         // Target subdomain

v1/pkg/dns/lookup.go

@@ -45,6 +45,15 @@ func (q *Query) Lookup() {
 			return
 		}
 
+		// Verify check
+		if q.Verify {
+			if Verify(q.Subdomain) {
+				result.Error = errors.New(fmt.Sprintf("Could not verify %s", q.Subdomain))
+				q.Results <- result
+				return
+			}
+		}
+
 		// Store IPs
 		var ips []string
 

v1/pkg/dns/verify.go

@@ -0,0 +1,15 @@
+package dns
+
+import (
+	"net/http"
+)
+
+// Verify subdomain
+func Verify(subdomain string) bool {
+	_, err := http.Get(subdomain)
+	if err != nil {
+		return false
+	}
+
+	return true
+}

v1/pkg/runner/options.go

@@ -12,12 +12,12 @@ type Options struct {
 	UDP       bool         // Query using UDP
 	IPv6      bool         // Query for IPv6
 	Timeout   int          // Query timeout
+	Verify    bool         // Verify query
 	Threads   int          // Concurrent threads
 	OnResult  OnResultFunc // Result handler
 
 	// Todo
 	// ENT    bool // Query for ENT
-	// Verify bool // Verify query
 }
 
 // Result handler function

v1/pkg/runner/runner.go

@@ -64,6 +64,7 @@ func (r *Runner) Submit() {
 			query := &dns.Query{
 				Client:    r.client,
 				IPv6:      r.options.IPv6,
+				Verify:    r.options.Verify,
 				Resolvers: r.options.Resolvers,
 				Domain:    domain,
 				Subdomain: word + "." + domain,