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block.go
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block.go
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package main
import (
"fmt"
"github.com/coreos/go-iptables/iptables"
)
// Block a given ip with iptables
// Blocking 8.8.8.8 with the LOGGING chain looks like this
// iptables -A INPUT -s 8.8.8.8/32 -j LOGGING
func BlockIP(ip string) bool {
// Some default chain names
sChain := "INPUT"
dChain := "LOGGING"
// Get a new iptables interface
ipt, err := iptables.New()
if err != nil {
log(fmt.Sprintf("Failed to new up an IPtables intance. ERROR: %v", err))
return false
}
// Build out the ipstring(add /32 to the end)
ipstr := fmt.Sprintf("%s%s", ip, "/32")
// Use the appendUnique method to put this in iptables, but only once
err = ipt.AppendUnique("filter", sChain, "-s", ipstr, "-j", dChain)
if err != nil {
log(fmt.Sprintf("Failed to ban an ip(%v). ERROR: %v", ipstr, err))
return false
}
// Since we made it here, we won
return true
}
func UnBlockIP(ip string) bool {
// Some default chain names
sChain := "INPUT"
dChain := "LOGGING"
// Get a new iptables interface
ipt, err := iptables.New()
if err != nil {
log(fmt.Sprintf("Failed to new up an IPtables intance. ERROR: %v", err))
return false
}
// Build out the ipstring(add /32 to the end)
ipstr := fmt.Sprintf("%s%s", ip, "/32")
// Use the appendUnique method to put this in iptables, but only once
err = ipt.Delete("filter", sChain, "-s", ipstr, "-j", dChain)
if err != nil {
log(fmt.Sprintf("Failed to ban an ip(%v). ERROR: %v", ipstr, err))
return false
}
// Since we made it here, we won
return true
}