What this script does is, check the gateway mac address to find out if you are within your lan or in a different place. If at home, mount a share as normal. If away, mount that share as a ssh file system.

 bash | 
 
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#!/bin/bash
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gateway=$(ip route show 0.0.0.0/0 | awk '{print $3}')
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mactest=$(arp -n -a $gateway | awk '{print $4}')
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targetmac="XX:XX:XX:XX:XX:XX"
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homeup="mount -t cifs -o username=USER,password=PASSWORD //SERVER/SHARE /mnt/remote"
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awayup="sshfs my.dyndns.tld:/path/to/share /mnt/remote"
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down="umount -l /mnt/remote"
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if [ $mactest==$targetmac ]
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then
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 case "$2" in
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         up)
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                $homeup
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         ;;
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         down)
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                $down
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         ;;
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 esac
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else
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 case "$2" in
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 up)
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 $awayup
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 ;;
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 down)
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 $down
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 ;;
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 esac
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fi
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