47 regels
812 B
Go
47 regels
812 B
Go
package main
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import (
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"fmt"
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"net"
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"os"
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"git.rootprojects.org/root/telebit/internal/iplist"
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)
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func help() {
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fmt.Fprintf(os.Stderr, "Usage: iplist _allowed.domain.tld 123.45.6.78\n")
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fmt.Fprintf(os.Stderr, "(`dig TXT +short _allowed.domain.tld` should return a list like `v=spf1 ip4:123.45.6.78 ip4:123.45.6.1/24`\n")
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os.Exit(1)
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}
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func main() {
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if 3 != len(os.Args) {
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help()
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return
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}
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txtDomain := os.Args[1]
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remoteIP := net.ParseIP(os.Args[2])
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if nil == remoteIP {
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fmt.Fprintf(os.Stderr, "bad remote IP\n")
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os.Exit(1)
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return
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}
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iplist.Init(txtDomain)
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allowed, err := iplist.IsAllowed(remoteIP)
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if nil != err {
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fmt.Fprintf(os.Stderr, err.Error())
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os.Exit(1)
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return
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}
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if !allowed {
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fmt.Fprintf(os.Stderr, "not allowed\n")
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os.Exit(1)
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return
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}
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fmt.Println("allowed")
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}
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