I try to connect to my router using ssh in order to automatically extract some logs from it.
I developed this code below :
#!/usr/bin/expect -f
spawn ssh root@192.168.1.1
expect "Are you sure you want to"
send -- "yes\r"
expect "password"
send -- "root\r"
expect "\#"
send -- "ls\r"
expect "\#"
the problem is I expected a garbage before the prompt in the output log.
spawn ssh root@192.168.1.1
The authenticity of host '192.168.1.1 (192.168.1.1)' can't be established.
RSA key fingerprint is SHA256:6aeE74qXMeQzg0SGJBZMIa0HFQ5HJrNqE5f3XZ6Irds.
Are you sure you want to continue connecting (yes/no)? yes
Failed to add the host to the list of known hosts (/home/amin/.ssh/known_hosts).
root@192.168.1.1's password:
BusyBox v1.30.1 () built-in shell (ash)
OpenWrt Version: ALPHA
OpenWrt base: 19.07
------------------------------------
]0;root@openwrt: ~root@openwrt:~# ls
[0;0mnetwork[m
]0;root@openwrt: ~root@openwrt:~#
what's the main cause of this issue? How I can fix it?
The problem is that there are terminal escape sequences being issued, probably to control what colour the terminal uses. The easiest fix is to set the terminal type (an environment variable) to something that doesn't support colour before doing the spawn. Perhaps this will do the trick:
set env(TERM) "dumb"
If that doesn't work (it depends on exactly what is in someone's .bashrc) then you can just override the PS1 environment variable on the remote side with your first command after logging in.
# etc for logging in
expect "# "
send "PS1='# '\r"
expect "# "
# Everything should be right from here on