From dced691bd318c805fa0fe5b8d460a91797db7fea Mon Sep 17 00:00:00 2001
From: MeaTLoTioN <ml@erb.pw>
Date: Thu, 23 Jun 2022 17:39:36 +0100
Subject: [PATCH] initial commit

---
 spf_check.sh | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100755 spf_check.sh

diff --git a/spf_check.sh b/spf_check.sh
new file mode 100755
index 0000000..9aa2255
--- /dev/null
+++ b/spf_check.sh
@@ -0,0 +1,28 @@
+#!/bin/bash
+usage() {
+  echo "Usage: $(basename $0) {domain.tld} {debug}        | debug is optional, accepts true/yes/1 for true and false/no/0 for false (or just don't use)"
+  exit 1
+}
+[[ $# -gt 0 ]] && DOMAIN=$1 || usage
+case $2 in
+  [yY][eE][sS]|[tT][rR][uU][eE]|1) DEBUG=true;;
+esac
+COUNT=0
+DEPTH=0
+mDEPTH=0
+checkIncludes() {
+  SPF=$1
+  for I in $(dig -t txt $SPF +short|grep -oE "include:.* |ip[4,6]:.* "|sed 's/include://g; s/ip[4,6]://g; s/\"//g'|tr ' ' '\n'); do
+    [[ $DEBUG ]] && printf "%*s%s %s\n" $(($DEPTH*2)) '' "$I"
+    if [[ ! ${I} =~ ^[0-9] ]]; then
+      DEPTH=$(($DEPTH+1))
+      mDEPTH=$(($mDEPTH+1))
+      checkIncludes $I
+    fi
+    COUNT=$(($COUNT+1))
+  done
+  DEPTH=$(($DEPTH-1))
+}
+checkIncludes $DOMAIN
+[[ $DEBUG ]] && echo
+echo "Total: $COUNT (Max lookups: $mDEPTH)"