66 lines
1.8 KiB
Go
66 lines
1.8 KiB
Go
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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func (hub *Hub) loadQueryArgs() error {
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err := hub.loadNamedArgs()
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if err != nil {
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return err
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}
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err = hub.loadFreeArgs()
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if err != nil {
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return err
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}
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hub.loadFallbacks()
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return nil
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}
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// loadFreeArgs tries to parse all the arguments
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// given to the CLI. 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 map it to internal query
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// options. 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 "query name".
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func (hub *Hub) loadFreeArgs() error {
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for _, arg := range hub.FreeArgs {
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if strings.HasPrefix(arg, "@") {
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hub.QueryFlags.Nameservers = append(hub.QueryFlags.Nameservers, strings.Trim(arg, "@"))
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} else if _, ok := dns.StringToType[strings.ToUpper(arg)]; ok {
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hub.QueryFlags.QTypes = append(hub.QueryFlags.QTypes, arg)
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} else if _, ok := dns.StringToClass[strings.ToUpper(arg)]; ok {
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hub.QueryFlags.QClasses = append(hub.QueryFlags.QClasses, arg)
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} else {
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// if nothing matches, consider it's a query name.
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hub.QueryFlags.QNames = append(hub.QueryFlags.QNames, arg)
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}
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}
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return nil
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}
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// loadNamedArgs checks for all flags and loads their
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// values inside the Hub.
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func (hub *Hub) loadNamedArgs() error {
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// Unmarshall flags to the struct.
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err := k.Unmarshal("", &hub.QueryFlags)
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if err != nil {
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return err
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}
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return nil
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}
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// loadFallbacks sets fallbacks for options
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// that are not specified by the user.
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func (hub *Hub) loadFallbacks() {
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if len(hub.QueryFlags.QTypes) == 0 {
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hub.QueryFlags.QTypes = append(hub.QueryFlags.QTypes, "A")
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}
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if len(hub.QueryFlags.QClasses) == 0 {
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hub.QueryFlags.QClasses = append(hub.QueryFlags.QClasses, "IN")
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}
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}
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