random port selection

.gitignore

@@ -1,2 +1,3 @@
 access_granted
+access_denied
 config

README.md

@@ -11,4 +11,4 @@ $EDITOR config
 ```run server (socat required)
 ./bss.sh <PORT>
 ```
-
+run it without argument -> random port selected

bbs.sh

@@ -1,7 +1,13 @@
 #!/bin/sh
 
-echo "listening for commands on 0.0.0.0:$1"
+if [ ! -n "$1" ]; then
+	port=$(shuf -i 1024-65000 -n 1)
+else
+	port=$1
+fi
 
-socat -v -v TCP-LISTEN:$1,reuseaddr,pktinfo,fork SYSTEM:"./executor.sh"
+echo "listening for commands on 0.0.0.0:$port"
+
+socat -v -v TCP-LISTEN:$port,reuseaddr,pktinfo,fork SYSTEM:"./executor.sh"
 
 

executor.sh

@@ -23,6 +23,10 @@ die(){
 }
 
 mkdir -p -m 700 access_granted
+mkdir -p -m 700 access_denied
+
+if [ -f access_denied/"$remote_ip" ]; then exit 0; fi
+
 generator_session=$(zcat -f $system_dict | shuf -n 2 | tr -d "\n'")
 randpadding=$(head -c 8 /dev/urandom | base64)
 printf "$randpadding\t$generator_session\n"