Netgear GS728TP CLI and scripting
It's been a long time between posts. I can assure you I'm not dead. At least not that I know of. I've been doing some neat stuff, but have been too lazy to post any of it - because as any dev will tell you - doing documentation is boring.
So, after upgrading my access points to use a Cisco Virtual Wireless Controller, I was using the web interface on my Netgear GS728TP - but it really sucks. It's slow. It's really slow - but it has a fully functioning CLI under the hood. However, the SSH server is old as well, so it needs a whole heap of legacy enablement in the SSH client to function. It is an EoL product, being first released in November 2017 from what I can tell. However they're cheap to find second hand, and have 8x POE+ ports - which means they'll run your high power PoE kit.
I did some work with expect - and came up with this script to do some pretty common functions.
Save as ~/bin/switch.
#!/usr/bin/expect set switch_password "<switch password>" set switch_login "admin@<switch ip>" set TFTPSERVER "<tftp server ip>" set switch_ssh_opts "-oPubKeyAcceptedAlgorithms=ssh-rsa -oRequiredRSASize=1024 -oKexAlgorithms=diffie-hellman-group1-sha1 -oHostKeyAlgorithms=ssh-rsa,ssh-dss -oCiphers=aes128-cbc,aes128-ctr,aes256-ctr" set commands(0) "terminal datadump" set commands(1) "terminal width 0" set timeout 120 set func [lindex $argv 0] switch $func { if { set arg [lindex $argv 1] switch $arg { description { append commands([array size commands]) "show interfaces description" } detail { set port [lindex $argv 2] append commands([array size commands]) "show interfaces switchport ge $port" } reset { set port [lindex $argv 2] append commands([array size commands]) "config" append commands([array size commands]) "interface GigabitEthernet $port" append commands([array size commands]) "shutdown" append commands([array size commands]) "no shutdown" append commands([array size commands]) "exit\rexit\r" } summary { append commands([array size commands]) "show interfaces status detailed" } default { puts "Subcommands:\r" puts "\tdescription\r" puts "\tdetail <port>\r" puts "\treset <port>\r" puts "\tsummary\r" exit 0 } } } poe { set arg [lindex $argv 1] switch $arg { consumption { append commands([array size commands]) "show power inline consumption" } off { set port [lindex $argv 2] append commands([array size commands]) "config" append commands([array size commands]) "interface GigabitEthernet $port" append commands([array size commands]) "power inline never" append commands([array size commands]) "exit\rexit\r" } on { set port [lindex $argv 2] append commands([array size commands]) "config" append commands([array size commands]) "interface GigabitEthernet $port" append commands([array size commands]) "power inline auto" append commands([array size commands]) "exit\rexit\r" } reset { set port [lindex $argv 2] append commands([array size commands]) "config" append commands([array size commands]) "interface GigabitEthernet $port" append commands([array size commands]) "power inline never" append commands([array size commands]) "power inline auto" append commands([array size commands]) "exit\rexit\r" } summary { append commands([array size commands]) "show power inline" } default { puts "Subcommands:\r" puts "\tconsumption\r" puts "\toff <port>\r" puts "\ton <port>\r" puts "\treset <port>\r" puts "\tsummary\r" exit 0 } } } reboot { send -- "reload\r" expect "(Y/N)" send -- "y\r" interact } saveconfig { set DATE [clock format [clock seconds] -format {%Y-%m-%d_%H%M}] append commands([array size commands]) "copy running-config tftp://$TFTPSERVER/gs728tp/running-config-$DATE.txt" } vlan { append commands([array size commands]) "show vlan" } default { puts "Commands:\r" puts "\tif <cmd>\r" puts "\tpoe <cmd>\r" puts "\treboot\r" puts "\tsaveconfig\r" puts "\tvlan\r" exit } } eval spawn ssh $switch_ssh_opts $switch_login expect "assword:" send -- "$switch_password\r" for { set index 0 } { $index < [array size commands] } { incr index } { expect "#" send -- "$commands($index)\r" } expect "\r\nconsole#" send -- "exit\r" expect eof
This gives me a nice little easy to use command set for some very basic stuff - however, if you're like me with a million scripts, I also forget the options :)
As such, I took a dive into the bash-completion universe and managed to come up with this.
Save as ~/.bash_completion.
#/usr/bin/env bash _switch_completions() { local cur prev COMPREPLY=() cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]} if [ $COMP_CWORD -eq 1 ]; then COMPREPLY=( $(compgen -W "if poe reboot saveconfig vlan" -- $cur) ) elif [ $COMP_CWORD -eq 2 ]; then case "$prev" in "if") COMPREPLY=( $(compgen -W "description detail reset summary" -- $cur) ) ;; "poe") COMPREPLY=( $(compgen -W "consumption off on reset summary" -- $cur) ) ;; *) ;; esac fi return 0 } && complete -F _switch_completions switch
As an example, if I run switch if summary, I'll get the following output:
spawn ssh -oPubKeyAcceptedAlgorithms=ssh-rsa -oRequiredRSASize=1024 -oKexAlgorithms=diffie-hellman-group1-sha1 -oHostKeyAlgorithms=ssh-rsa,ssh-dss -oCiphers=aes128-cbc,aes128-ctr,aes256-ctr admin@<switch-ip>
admin@<switch-ip>'s password:
console#terminal datadump
console#terminal width 0
console#show interfaces status detailed
Flow Link Back Mdix
Port Type Duplex Speed Neg ctrl State Pressure Mode
-------- ------------ ------ ----- -------- ---- ----------- -------- -------
g1 1G-Copper Full 1000 Disabled Off Up Disabled On
g2 1G-Copper -- -- -- -- Down -- --
g3 1G-Copper -- -- -- -- Down -- --
g4 1G-Copper -- -- -- -- Down -- --
g5 1G-Copper -- -- -- -- Down -- --
g6 1G-Copper -- -- -- -- Down -- --
g7 1G-Copper -- -- -- -- Down -- --
g8 1G-Copper -- -- -- -- Down -- --
g9 1G-Copper Full 1000 Disabled Off Up Disabled On
g10 1G-Copper Full 1000 Disabled Off Up Disabled On
g11 1G-Copper Full 1000 Disabled Off Up Disabled On
g12 1G-Copper Full 1000 Disabled Off Up Disabled On
g13 1G-Copper Full 100 Enabled Off Up Disabled On
g14 1G-Copper Full 100 Enabled Off Up Disabled Off
g15 1G-Copper -- -- -- -- Down -- --
g16 1G-Copper -- -- -- -- Down -- --
g17 1G-Copper -- -- -- -- Down -- --
g18 1G-Copper -- -- -- -- Down -- --
g19 1G-Copper -- -- -- -- Down -- --
g20 1G-Copper -- -- -- -- Down -- --
g21 1G-Copper -- -- -- -- Down -- --
g22 1G-Copper -- -- -- -- Down -- --
g23 1G-Copper Full 1000 Enabled Off Up Disabled On
g24 1G-Copper Full 100 Enabled Off Up Disabled Off
g25 1G-Fiber -- -- -- -- Down -- --
g26 1G-Fiber -- -- -- -- Down -- --
g27 1G-Fiber -- -- -- -- Down -- --
g28 1G-Fiber -- -- -- -- Down -- --
Flow Link
Ch Type Duplex Speed Neg control State
-------- ------- ------ ----- -------- ------- -----------
po 1 -- -- -- -- -- Not Present
po 2 -- -- -- -- -- Not Present
po 3 -- -- -- -- -- Not Present
po 4 -- -- -- -- -- Not Present
po 5 -- -- -- -- -- Not Present
po 6 -- -- -- -- -- Not Present
po 7 -- -- -- -- -- Not Present
po 8 -- -- -- -- -- Not Present
console#exit
So now, not only do I have an easy way to bring up basic details of the switch, when I forget what options do what, you can just use the TAB auto-completion in bash. Yay, yet another thing I don't have to remember in the day-to-day :)
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