Adding Bash dns header

Bash/dns.bash

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+function GenerateTLSAHash {
+    ### Generate DANE TLSA
+    # param 1: Certfile
+    openssl x509 -in "$1" -noout -pubkey | openssl pkey -pubin -outform DER | openssl dgst -sha256 -binary | hexdump -ve '/1 "%02x"'
+}
+function GenerateTLSA-311 {
+    ### Generate DANE TLSA
+    # param 1: identity
+    printf "3 1 1 $(GenerateTLSAHash /etc/letsencrypt/live/"$1"/cert.pem)\n"
+}
+
+function GenerateTLSA-211 {
+    ### Generate DANE TLSA
+    # param 1: identity
+    printf "2 1 1 $(GenerateTLSAHash /etc/letsencrypt/live/"$1"/chain.pem)\n"
+}
+
+function GenerateTLSA {
+    ### Generate DANE TLSA
+    # param 1: identity
+    GenerateTLSA-311 "$1"
+    GenerateTLSA-211 "$1"
+}
+
+function GenerateCAA {
+    ### Generate CAA
+    # Pending an attribute on the chain to derive this from.
+    echo '128 issue "letsencrypt.org"'
+}
+
+function GenerateSSHFP {
+    ### Generate the SSHFP
+    ssh-keyscan -D localhost | grep -E '1 2|4 2' | sed 's/localhost IN SSHFP //'
+}