doggo/internal/app/questions.go

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package app
import (
"strings"
"github.com/miekg/dns"
)
// LoadFallbacks sets fallbacks for options
// that are not specified by the user but necessary
// for the resolver.
func (app *App) LoadFallbacks() {
if len(app.QueryFlags.QTypes) == 0 {
app.QueryFlags.QTypes = append(app.QueryFlags.QTypes, "A")
}
if len(app.QueryFlags.QClasses) == 0 {
app.QueryFlags.QClasses = append(app.QueryFlags.QClasses, "IN")
}
}
// PrepareQuestions takes a list of query names, query types and query classes
// and prepare a question for each combination of the above.
func (app *App) PrepareQuestions() {
for _, n := range app.QueryFlags.QNames {
for _, t := range app.QueryFlags.QTypes {
for _, c := range app.QueryFlags.QClasses {
app.Questions = append(app.Questions, dns.Question{
Name: n,
Qtype: dns.StringToType[strings.ToUpper(t)],
Qclass: dns.StringToClass[strings.ToUpper(c)],
})
}
}
}
}
// ReverseLookup is used to perform a reverse DNS Lookup
// using an IPv4 or IPv6 address.
// Query Type is set to PTR, Query Class is set to IN.
// Query Names must be formatted in in-addr.arpa. or ip6.arpa format.
func (app *App) ReverseLookup() {
app.QueryFlags.QTypes = []string{"PTR"}
app.QueryFlags.QClasses = []string{"IN"}
formattedNames := make([]string, 0, len(app.QueryFlags.QNames))
for _, n := range app.QueryFlags.QNames {
addr, err := dns.ReverseAddr(n)
if err != nil {
app.Logger.WithError(err).Fatal("error formatting address")
}
formattedNames = append(formattedNames, addr)
}
app.QueryFlags.QNames = formattedNames
}