56 lines
1.6 KiB
Go
56 lines
1.6 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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"github.com/urfave/cli/v2"
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)
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func (hub *Hub) loadQueryArgs(c *cli.Context) error {
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err := hub.loadFreeArgs(c)
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if err != nil {
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cli.Exit("Error parsing arguments", -1)
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}
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err = hub.initResolver(c)
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if err != nil {
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cli.Exit("Error parsing nameservers", -1)
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}
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hub.loadFallbacks(c)
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return err
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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(c *cli.Context) error {
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for _, arg := range c.Args().Slice() {
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if strings.HasPrefix(arg, "@") {
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hub.QueryFlags.Nameservers.Set(strings.Trim(arg, "@"))
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} else if _, ok := dns.StringToType[strings.ToUpper(arg)]; ok {
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hub.QueryFlags.QTypes.Set(arg)
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} else if _, ok := dns.StringToClass[strings.ToUpper(arg)]; ok {
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hub.QueryFlags.QClasses.Set(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.Set(arg)
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}
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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(c *cli.Context) {
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if len(hub.QueryFlags.QTypes.Value()) == 0 {
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hub.QueryFlags.QTypes.Set("A")
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}
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if len(hub.QueryFlags.QClasses.Value()) == 0 {
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hub.QueryFlags.QClasses.Set("IN")
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}
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}
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