/
alookup.go
127 lines (113 loc) · 3.77 KB
/
alookup.go
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/*
* ZDNS Copyright 2016 Regents of the University of Michigan
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package alookup
import (
"flag"
"strings"
"github.com/miekg/dns"
"github.com/zmap/zdns"
"github.com/zmap/zdns/modules/miekg"
)
type Result struct {
IPv4Addresses []string `json:"ipv4_addresses,omitempty"`
IPv6Addresses []string `json:"ipv6_addresses,omitempty"`
}
// Per Connection Lookup ======================================================
//
type Lookup struct {
Factory *RoutineLookupFactory
miekg.Lookup
}
func (s *Lookup) DoLookup(name string) (interface{}, zdns.Status, error) {
nameServer := s.Factory.Factory.RandomNameServer()
return s.DoTargetedLookup(name, nameServer)
}
func (s *Lookup) DoTargetedLookup(name, nameServer string) (interface{}, zdns.Status, error) {
requests := []uint16{}
if s.Factory.Factory.IPv6Lookup {
requests = append(requests, dns.TypeAAAA)
}
if s.Factory.Factory.IPv4Lookup {
requests = append(requests, dns.TypeA)
}
res := Result{}
for _, dnsType := range requests {
miekgResult, status, err := miekg.DoLookup(s.Factory.Client, s.Factory.TCPClient, nameServer, dnsType, name)
if status != zdns.STATUS_SUCCESS || err != nil {
return nil, status, err
}
names := map[string]bool{strings.ToLower(name): true}
searchSet := []miekg.Answer{}
searchSet = append(searchSet, miekgResult.(miekg.Result).Additional...)
searchSet = append(searchSet, miekgResult.(miekg.Result).Answers...)
for _, add := range searchSet {
if add.Type == "CNAME" {
if _, ok := names[strings.ToLower(add.Name)]; ok {
names[strings.ToLower(add.Answer[0:len(add.Answer)-1])] = true
}
}
}
for _, add := range searchSet {
if add.Type == dns.Type(dnsType).String() {
if _, ok := names[strings.ToLower(add.Name)]; ok {
if add.Type == dns.Type(dns.TypeA).String() {
res.IPv4Addresses = append(res.IPv4Addresses, add.Answer)
}
if add.Type == dns.Type(dns.TypeAAAA).String() {
res.IPv6Addresses = append(res.IPv6Addresses, add.Answer)
}
}
}
}
}
return res, zdns.STATUS_SUCCESS, nil
}
// Per GoRoutine Factory ======================================================
//
type RoutineLookupFactory struct {
miekg.RoutineLookupFactory
Factory *GlobalLookupFactory
}
func (s *RoutineLookupFactory) MakeLookup() (zdns.Lookup, error) {
a := Lookup{Factory: s}
return &a, nil
}
// Global Factory =============================================================
//
type GlobalLookupFactory struct {
zdns.BaseGlobalLookupFactory
IPv4Lookup bool
IPv6Lookup bool
}
func (s *GlobalLookupFactory) AddFlags(f *flag.FlagSet) {
f.BoolVar(&s.IPv4Lookup, "ipv4-lookup", true, "perform A lookups for each server")
f.BoolVar(&s.IPv6Lookup, "ipv6-lookup", true, "perform AAAA record lookups for each server")
}
// Command-line Help Documentation. This is the descriptive text what is
// returned when you run zdns module --help
func (s *GlobalLookupFactory) Help() string {
return ""
}
func (s *GlobalLookupFactory) MakeRoutineFactory() (zdns.RoutineLookupFactory, error) {
r := new(RoutineLookupFactory)
r.Factory = s
r.Initialize(s.GlobalConf.Timeout)
return r, nil
}
// Global Registration ========================================================
//
func init() {
s := new(GlobalLookupFactory)
zdns.RegisterLookup("ALOOKUP", s)
}