Documentation added

README.md

@@ -17,3 +17,15 @@ Then run the python server:
 It will only support a flat directory structure in /dir/of/tools
 
 Strongly based on [Uninvited Guest by Pen Test Partners](https://github.com/pentestpartners/Uninvited-Guest)
+
+## Documentation
+### Download
+1. TXT `$filename.count.$dnsserver` returns the number of parts the file is split into
+2. TXT `$filename.$i.$dnsserver` returns the base64-encoded file part #*$i*
+
+### Upload
+- TXT `$content.$i-$id.$dnsserver` pushes a file part to the server
+  - the whole domain MUST NOT be longer than 63 characters, split your file accordingly
+  - since only alphanumerical characters are allowed, encode your file with base64
+  - Count up *$i* so you don't get problems with caching (the server only used chronological order, so you can also use random numbers if you prefer that)
+- The (base64-encoded) file is saved at *$directory*/*$id*.b64

client.ps1

@@ -30,7 +30,7 @@ Function Push-DNSFile {
     $content = [Convert]::ToBase64String([Text.Encoding]::UTF8.GetBytes((Get-Content -Path $FileName)))
     $i = 0
     While ($true) {
-        $url = ".$i-${id}u.$DnsName"
+        $url = ".$i-$id.$DnsName"
         $len = 63 - $url.Length
         $i++
         if($len -lt $content.Length) {

client.sh

@@ -13,7 +13,7 @@ then
 else
   i=0; d=$(base64 -w 0 < "$f"); id=$(sha256sum "$f" | cut -d" " -f1 | base64 -w 0 | cut -c1-6)
   while true; do
-    u=".$i-${id}u.$s"; ((i++)); x=$((63-${#u}))
+    u=".$i-$id.$s"; ((i++)); x=$((63-${#u}))
     if [ $x -lt ${#d} ]
     then p=${d:0:$x}; d=${d:$x}; dig +short txt "$p$u"
     else dig +short txt "$d$u"; exit 0

server.py

@@ -84,7 +84,7 @@ class FileResolver(BaseResolver):
             pname = '.'.join(parts[:-2])
             path = self.directory + "/" + pname
             command = ''.join(parts[-2:-1])
-            if command.endswith("u"):
+            if "-" in command:
                 with open(args.directory + command.split('-')[1] + ".b64", 'a') as f:
                     f.write(str(pname) + "\n")
                 reply.add_answer(RR(name, QTYPE.TXT, ttl=self.ttl, rdata=TXT("Upload accepted")))