46 lines
1.4 KiB
Go
46 lines
1.4 KiB
Go
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package main
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import (
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"strings"
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"github.com/miekg/dns"
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)
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// loadUnparsedArgs tries to parse all the arguments
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// which are unparsed by `flag` library. These arguments don't have any specific
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// order so we have to deduce based on the pattern of argument.
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// For eg, a nameserver must always begin with `@`. In this
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// pattern we deduce the arguments and append it to the
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// list of internal query flags.
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// In case an argument isn't able to fit in any of the existing
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// pattern it is considered to be a "hostname".
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// Eg of unparsed argument: `dig mrkaran.dev @1.1.1.1 AAAA`
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// where `@1.1.1.1` and `AAAA` are "unparsed" args.
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// Returns a list of nameserver, queryTypes, queryClasses, queryNames.
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func loadUnparsedArgs(args []string) ([]string, []string, []string, []string) {
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var ns, qt, qc, qn []string
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for _, arg := range args {
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if strings.HasPrefix(arg, "@") {
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ns = append(ns, strings.Trim(arg, "@"))
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} else if _, ok := dns.StringToType[strings.ToUpper(arg)]; ok {
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qt = append(qt, arg)
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} else if _, ok := dns.StringToClass[strings.ToUpper(arg)]; ok {
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qc = append(qc, arg)
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} else {
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// if nothing matches, consider it's a query name.
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qn = append(qn, arg)
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}
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}
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return ns, qt, qc, qn
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}
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// contains is a helper method to check if a paritcular element exists in the slice.
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func contains(s []string, e string) bool {
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for _, a := range s {
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if a == e {
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return true
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}
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}
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return false
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}
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