Jarno Rankinen revised this gist . Go to revision
1 file changed, 71 insertions
port_forward(file created)
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| 1 | + | #!/bin/bash | |
| 2 | + | ||
| 3 | + | if [[ "$1" == "stop" ]]; then | |
| 4 | + | printf "Reloading firewall.. " | |
| 5 | + | firewall-cmd --reload | |
| 6 | + | exit $? | |
| 7 | + | fi | |
| 8 | + | ||
| 9 | + | function usage () { | |
| 10 | + | printf "\nUsage: | |
| 11 | + | ||
| 12 | + | $0 FROM_PORT TO_ADDR:TO_PORT [PROTO] | |
| 13 | + | $0 stop | |
| 14 | + | ||
| 15 | + | FROM_PORT External port on public zone | |
| 16 | + | TO_ADDR Destination address | |
| 17 | + | TO_PORT Destination port | |
| 18 | + | PROTO Protocol (tcp/udp, optional, | |
| 19 | + | defaults to tcp) | |
| 20 | + | stop Remove port forwarding | |
| 21 | + | ||
| 22 | + | Example: | |
| 23 | + | ||
| 24 | + | $0 8080 192.168.122.122:80 | |
| 25 | + | - will forward connections coming to port 80 to | |
| 26 | + | a VM with address 192.168.122.122 | |
| 27 | + | \n" | |
| 28 | + | exit 0 | |
| 29 | + | } | |
| 30 | + | ||
| 31 | + | function forward () { | |
| 32 | + | echo "Creating port forward from port $FROM_PORT/$PROTO to $TO_ADDR:$TO_PORT." | |
| 33 | + | ||
| 34 | + | printf "Enabling masquerade... " | |
| 35 | + | firewall-cmd --add-masquerade | |
| 36 | + | printf "Adding port forward... " | |
| 37 | + | firewall-cmd --add-forward-port=port=${FROM_PORT}:proto=${PROTO}:toport=${TO_PORT}:toaddr=${TO_ADDR} | |
| 38 | + | # iptables -D LIBVIRT_FWI -o virbr0 -j REJECT --reject-with icmp-port-unreachable | |
| 39 | + | # iptables -D LIBVIRT_FWO -i virbr0 -j REJECT --reject-with icmp-port-unreachable | |
| 40 | + | ||
| 41 | + | echo "Done." | |
| 42 | + | exit 0 | |
| 43 | + | } | |
| 44 | + | ||
| 45 | + | ||
| 46 | + | ||
| 47 | + | if [ "$#" -lt 2 ] || [ "$#" -gt 3 ]; then | |
| 48 | + | usage | |
| 49 | + | fi | |
| 50 | + | ||
| 51 | + | if [ "$UID" -ne 0 ]; then | |
| 52 | + | echo "Run as root." | |
| 53 | + | exit 1 | |
| 54 | + | fi | |
| 55 | + | ||
| 56 | + | FROM_PORT=$1 | |
| 57 | + | TO_ADDR=${2%:*} | |
| 58 | + | TO_PORT=${2##*:} | |
| 59 | + | PROTO=${3:-'tcp'} | |
| 60 | + | ||
| 61 | + | if [[ ! "$TO_ADDR" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then | |
| 62 | + | printf "Resolved %s as " "$TO_ADDR" | |
| 63 | + | TO_ADDR=`dig +short "$TO_ADDR" | head -1` | |
| 64 | + | printf "%s\n" "$TO_ADDR" | |
| 65 | + | fi | |
| 66 | + | ||
| 67 | + | if [[ "$PROTO" != "tcp" ]] && [[ "$PROTO" != "udp" ]]; then | |
| 68 | + | usage | |
| 69 | + | fi | |
| 70 | + | ||
| 71 | + | forward | |
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