Linux Bash Script: Check Established connections to known criteria

Parse a list of established IP connections and check various parameters e.g. endpoint IP, process name, etc & return error code based on result. This is a embedded linux device that has only outward going connections, the connections need to be monitored against changes indicating system has been compromised. Internal script variables: FQDN Own Fully Qualified DNS Name EXIP External IP of Interface , FQDN_DT1 (Designated target 1) FQDN_DT2 (Designated target 2) Allowed connections: 1x SSH port 22, process dropbear 1x localhost port 5000, process someProcess & java 4x EXIP to FQDN_DT1 Port 4050, process java 1x FQDN to FQDN_DT1 Port 4000, process java 1x FQDN to FQDN_DT1 Port 4010, process java 2x FQDN to FQDN_DT1 Port 4090, process java If connection found not listed return 2, if all connection ok 0.