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- #!/bin/bash
- # redirects ports below 1024 to a higher range using iptables, so they can be used without elevated rights
- # MySQL SIP (3306 and 5060) are left out because they are >= 1024 anyways
- # ECHO FTP HTTP HTTPS S7COMM SNMP SMB (NETBIOS UDP & TCP) SSH TELNET MODBUS SMTP
- protocol=( "tcp" "tcp" "tcp" "tcp" "tcp" "udp" "udp" "udp" "tcp" "tcp" "tcp" "tcp" "tcp" "tcp" )
- origin=( 7 21 80 443 102 161 137 138 139 22 23 445 25 502 )
- destination=( 28144 28169 28217 28580 28239 28298 28274 28275 28276 28159 28160 28582 28162 28639 ) # simply offset by 1024 + 27113
- length=${#protocol[@]} # count protocol elements
- # for (( i=0; i<$length; i++ ))
- #for i in `seq 0 9` # fix for android's annoyingly limited bash
- for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 # another fix for devices missing the seq command
- do
- # echo ${protocol[$i]} ${origin[$i]} ${destination[$i]} # debug
- # delete previous rules to avoid duplicates
- iptables -t nat -D PREROUTING -p ${protocol[$i]} --dport ${origin[$i]} -j REDIRECT --to-ports ${destination[$i]}
- iptables -t nat -D OUTPUT -p ${protocol[$i]} --dport ${destination[$i]} -j REDIRECT --to-ports ${origin[$i]}
- # add new rules
- iptables -t nat -A PREROUTING -p ${protocol[$i]} --dport ${origin[$i]} -j REDIRECT --to-ports ${destination[$i]}
- iptables -t nat -A OUTPUT -p ${protocol[$i]} --dport ${destination[$i]} -j REDIRECT --to-ports ${origin[$i]}
- done
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