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29 lines
683 B
Bash
Executable File
29 lines
683 B
Bash
Executable File
#!/bin/bash
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if [ -z "$sip" ] || [ -z "$dip" ] || [ -z "$sport" ] || [ -z "$dport" ]; then
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>&2 echo 'missing required env var'
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exit 1
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fi
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rule_exists() {
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iptables -t nat -C "$@" 2>/dev/null
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}
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apply_rule() {
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if [ "$UNDO" = "1" ]; then
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if rule_exists "$@"; then
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iptables -t nat -D "$@"
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fi
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else
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if ! rule_exists "$@"; then
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iptables -t nat -A "$@"
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fi
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fi
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}
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apply_rule PREROUTING -p tcp -d $sip --dport $sport -j DNAT --to-destination $dip:$dport
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apply_rule OUTPUT -p tcp -d $sip --dport $sport -j DNAT --to-destination $dip:$dport
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if [ "$UNDO" = 1 ]; then
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conntrack -D -p tcp -d $sip --dport $sport
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fi |