Update rhost walker to handle interrupt signal

[adfoster-r7]

Updates the rhost walker to handle interrupt signals from the user when pressing ctrl+c in msfconsole

Improves #16765

Note that the ctrl+c interrupt signal won't be handled immediately - the DNS timeout will have to finish first. This seems like a bug in Ruby itself, where the the DNS resolve is blocking and the Ruby VM won't receive the interrupt signal until the DNS resolve timeout is hit - https://bugs.ruby-lang.org/issues/16476. So if the user spams ctrl+c, the multiple excess interrupt requests will bubble up after the DNS timeout ends - then msfconsole will be killed. Therefore the user will have to press ctrl+c once and wait patiently for invalid DNS requests to fail.

Verification

Steps are in #16765

[jheysel-r7]

Before

msf6 exploit(windows/iis/ms01_033_idq) > rexploit set target 1
[*] Reloading module...
rex	^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C[-] rexploit: Interrupted
[-] rexploit: Interrupted
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit

Aborting...
./msfconsole: Interrupt
./msfconsole:26:in `exit': Interrupt
	from ./msfconsole:26:in `rescue in <main>'
	from ./msfconsole:9:in `<main>'
/home/msfuser/.rvm/gems/ruby-3.0.2/gems/rex-core-0.1.28/lib/rex/sync/thread_safe.rb:36:in `select': Interrupt
	from /home/msfuser/.rvm/gems/ruby-3.0.2/gems/rex-core-0.1.28/lib/rex/sync/thread_safe.rb:36:in `select'
	from /home/msfuser/.rvm/gems/ruby-3.0.2/gems/rex-core-0.1.28/lib/rex/sync/thread_safe.rb:76:in `sleep'
	from (eval):3:in `sleep'
	from /home/msfuser/git/metasploit-framework/lib/rex/ui/text/shell/history_manager.rb:56:in `flush'
	from /home/msfuser/git/metasploit-framework/lib/rex/ui/text/shell.rb:173:in `ensure in run'
	from /home/msfuser/git/metasploit-framework/lib/rex/ui/text/shell.rb:174:in `run'
	from /home/msfuser/git/metasploit-framework/lib/metasploit/framework/command/console.rb:48:in `start'
	from /home/msfuser/git/metasploit-framework/lib/metasploit/framework/command/base.rb:82:in `start'
	from ./msfconsole:23:in `<main>'
/home/msfuser/git/metasploit-framework/lib/rex/ui/text/output/stdio.rb:89:in `write': Interrupt
	from /home/msfuser/git/metasploit-framework/lib/rex/ui/text/output/stdio.rb:89:in `print'
	from /home/msfuser/git/metasploit-framework/lib/rex/ui/text/output/stdio.rb:89:in `print_raw'
	from /home/msfuser/git/metasploit-framework/lib/rex/ui/text/output.rb:68:in `print'
	from /home/msfuser/git/metasploit-framework/lib/rex/ui/text/shell.rb:169:in `rescue in run'
	from /home/msfuser/git/metasploit-framework/lib/rex/ui/text/shell.rb:168:in `run'
	from /home/msfuser/git/metasploit-framework/lib/metasploit/framework/command/console.rb:48:in `start'
	from /home/msfuser/git/metasploit-framework/lib/metasploit/framework/command/base.rb:82:in `start'
	from ./msfconsole:23:in `<main>'
/home/msfuser/git/metasploit-framework/lib/rex/ui/text/input/readline.rb:21:in `const_defined?': Interrupt
	from /home/msfuser/git/metasploit-framework/lib/rex/ui/text/input/readline.rb:21:in `initialize'
	from /home/msfuser/git/metasploit-framework/lib/rex/ui/text/shell.rb:69:in `new'
	from /home/msfuser/git/metasploit-framework/lib/rex/ui/text/shell.rb:69:in `init_tab_complete'
	from /home/msfuser/git/metasploit-framework/lib/rex/ui/text/shell.rb:142:in `run'
	from /home/msfuser/git/metasploit-framework/lib/metasploit/framework/command/console.rb:48:in `start'
	from /home/msfuser/git/metasploit-framework/lib/metasploit/framework/command/base.rb:82:in `start'
	from ./msfconsole:23:in `<main>'

msfuser@ubuntu:~/git/metasploit-framework$

After

msf6 exploit(windows/iis/ms01_033_idq) > rexploit set target 1
[*] Reloading module...
rex
^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C[-] rexploit: Interrupted
[-] rexploit: Interrupted
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
Interrupt: use the 'exit' command to quit
msf6 exploit(windows/iis/ms01_033_idq) >

Spamming ctrl+c in this scenario no longer kills msfconsole 👍

[jheysel-r7]

Release Notes

Update rhost walker to handle interrupt signal