Adds the bufferoverrun source

README.md

@@ -30,6 +30,7 @@ Please feel free to issue pull requests with new sources! :)
 * hackertarget
 * threatcrowd
 * wayback machine
+* dns.bufferover.run
 * facebook
     * Needs `FB_APP_ID` and `FB_APP_SECRET` environment variables set
     * You need to be careful with your app's rate limits

bufferoverrun.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func fetchBufferOverrun(domain string) ([]string, error) {
+	out := make([]string, 0)
+
+	fetchURL := fmt.Sprintf("https://dns.bufferover.run/dns?q=.%s", domain)
+
+	wrapper := struct {
+		Records []string `json:"FDNS_A"`
+	}{}
+	err := fetchJSON(fetchURL, &wrapper)
+	if err != nil {
+		return out, err
+	}
+
+	for _, r := range wrapper.Records {
+		parts := strings.SplitN(r, ",", 2)
+		out = append(out, parts[1])
+	}
+
+	return out, nil
+}

main.go

@@ -37,6 +37,7 @@ func main() {
 		fetchVirusTotal,
 		fetchFindSubDomains,
 		fetchUrlscan,
+		fetchBufferOverrun,
 	}
 
 	out := make(chan string)