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On reading 'T', 'U', 'S', or 'P', getpts_aux would unconditionally consume the character before checking to see whether it was followed by a ':'. You could insert 'T', 'U', 'S', or 'P' in several places and it would just be ignored, which is different treatment than other letters got. Behavior before: nmap -p 9 # scans port 9 nmap -p discard # scans port 9 nmap -p Tdiscard # scans port 9 nmap -p T:Tdiscard # scans port 9 nmap -p Tdi*ard # scans port 9 nmap -p Xdiscard # Error #485: Your port specifications are illegal. Example of proper form: "-100,200-1024,T:3000-4000,U:60000-" Behavior after: nmap -p 9 # scans port 9 nmap -p discard # scans port 9 nmap -p Tdiscard # Error #485: Your port specifications are illegal. Example of proper form: "-100,200-1024,T:3000-4000,U:60000-" nmap -p T:Tdiscard # Error #485: Your port specifications are illegal. Example of proper form: "-100,200-1024,T:3000-4000,U:60000-" nmap -p Tdi*ard # Error #485: Your port specifications are illegal. Example of proper form: "-100,200-1024,T:3000-4000,U:60000-" nmap -p Xdiscard # Error #485: Your port specifications are illegal. Example of proper form: "-100,200-1024,T:3000-4000,U:60000-"
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( https://nmap.org ).