add timeout functionality
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parent
bdcc67e653
commit
259e6f49d7
27
knockr.go
27
knockr.go
@ -4,6 +4,7 @@ import (
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"fmt"
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"io"
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"net"
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"time"
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"github.com/mkideal/cli"
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)
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@ -12,9 +13,10 @@ type knockArguments struct {
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WhitelistPort int `cli:'wp' usage:'The port to launch the whitelist server on'`
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GatewayPort int `cli:'gp' usage:'The port to protect'`
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Destination string `cli:'d' usage:'The destination to relay traffic to'`
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Timeout int64 `cli:'t' usage:'Time in seconds after which a whitelist entry will be removed'`
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}
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var whitelist []string
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var whitelist = make(map[string]int64)
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var arguments *knockArguments
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func main() {
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@ -68,20 +70,35 @@ func gateway_handler(c net.Conn) {
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func add_to_whitelist(addr string) {
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if ! is_whitelisted(addr) {
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whitelist = append(whitelist, addr)
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update_whitelist_time(addr)
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}
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}
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func remove_from_whitelist(addr string) {
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delete(whitelist, addr)
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}
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func is_whitelisted(addr string) bool {
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for i:=0; i < len(whitelist); i++ {
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if whitelist[i] == addr {
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if _, present := whitelist[addr]; present {
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// Key is present in whitelist map
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if (whitelist[addr] + arguments.Timeout) >= time.Now().Unix() {
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// AND we are still in the timing window
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update_whitelist_time(addr)
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return true
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} else {
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// But we're outside of the timing window
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remove_from_whitelist(addr)
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return false
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}
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}
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// Entry is not present.
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return false
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}
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func update_whitelist_time(addr string) {
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whitelist[addr] = time.Now().Unix()
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}
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func proxy(c net.Conn) {
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ln, err := net.Dial("tcp", arguments.Destination)
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if err != nil {
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