"Match" implementation inside SSH Config File

[isontheline]

Tasks for complete implementation

• Ability to use a mashREPL command (or at least a Swift WebSSH Command) inside a MATCH
• Ability to "match" a connection by its TAGS or GROUP

Describe the feature
I would like to suggest a new subnet detection feature that dynamically chooses a hostname/IP to connect to based on which network the app is running from, configured for each connection.

e.g. if I'm on my home network and the app detects I'm on a specified subnet such as 192.168.0.x, I would like the app to connect to a local IP address. If I'm connecting from a network other than the specified one (ie roaming on my iPhone), it uses another hostname such as an external URL (my.homenet.com).

I can illustrate this based on a method I use with .ssh/config (which as it happens also uses another feature request - ProxyJump)

Match exec "/Users/user1/onsubnet 192.168.1." host raspi1
 Hostname 192.168.1.100
 Port 22
 User pi

Match exec "/Users/user1/onsubnet --not 192.168.1." host raspi1
 ProxyJump proxypi
 Hostname 192.168.1.100
 User pi
 Port 22

Host proxypi
 HostName my.homenet.com
 Port 8700
 User pi

The file /Users/user1/onsubnet is a script I found that helps determine your subnet on a Mac. I realise it couldn't be used in the app like this, but I'm including it here in case it helps.

if [[ "$1" == "--help" ]] || [[ "$1" == "-h" ]]  || [[ "$1" == "" ]] ; then
  printf "Usage:\n\tonsubnet [ --not ] partial-ip-address\n\n"
  printf "Example:\n\tonsubnet 10.10.\n\tonsubnet --not 192.168.0.\n\n"
  printf "Note:\n\tThe partial-ip-address must match starting at the first\n"
  printf "\tcharacter of the ip-address, therefore the first example\n"
  printf "\tabove will match 10.10.10.1 but not 110.10.10.1\n"
  exit 0
fi

on=0
off=1
if [[ "$1" == "--not" ]] ; then
  shift
  on=1
  off=0
fi

regexp="^$(sed 's/\./\\./g' <<<"$1")"

if [[ "$(uname)" == "Darwin" ]] ; then
  ifconfig | fgrep 'inet ' | fgrep -v 127.0.0. | cut -d ' ' -f 2 | egrep "$regexp" >/dev/null
else
  hostname -I | tr -s " " "\012" | fgrep -v 127.0.0. | egrep "$regexp" >/dev/null
fi

if [[ $? == 0 ]]; then
  exit $on
else
  exit $off
fi

In the absence of this feature I could always specify the external URL, but I'm not sure if that would work with ProxyJump where a connection to an internal device would keep having to hop via my proxypi to its destination when I'm at home.

Hope this makes sense.
Thanks.