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package maxmind
import (
"encoding/csv"
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"github.com/Loyalsoldier/geoip/lib"
)
const (
TypeGeoLite2ASNCSVIn = "maxmindGeoLite2ASNCSV"
DescGeoLite2ASNCSVIn = "Convert MaxMind GeoLite2 ASN CSV data to other formats"
)
var (
defaultGeoLite2ASNCSVIPv4File = filepath.Join("./", "geolite2", "GeoLite2-ASN-Blocks-IPv4.csv")
defaultGeoLite2ASNCSVIPv6File = filepath.Join("./", "geolite2", "GeoLite2-ASN-Blocks-IPv6.csv")
)
func init() {
lib.RegisterInputConfigCreator(TypeGeoLite2ASNCSVIn, func(action lib.Action, data json.RawMessage) (lib.InputConverter, error) {
return newGeoLite2ASNCSVIn(action, data)
})
lib.RegisterInputConverter(TypeGeoLite2ASNCSVIn, &GeoLite2ASNCSVIn{
Description: DescGeoLite2ASNCSVIn,
})
}
func newGeoLite2ASNCSVIn(action lib.Action, data json.RawMessage) (lib.InputConverter, error) {
var tmp struct {
IPv4File string `json:"ipv4"`
IPv6File string `json:"ipv6"`
Want lib.WantedListExtended `json:"wantedList"`
OnlyIPType lib.IPType `json:"onlyIPType"`
}
if len(data) > 0 {
if err := json.Unmarshal(data, &tmp); err != nil {
return nil, err
}
}
// When both of IP files are not specified,
// it means user wants to use the default ones
if tmp.IPv4File == "" && tmp.IPv6File == "" {
tmp.IPv4File = defaultGeoLite2ASNCSVIPv4File
tmp.IPv6File = defaultGeoLite2ASNCSVIPv6File
}
// Filter want list
wantList := make(map[string][]string) // map[asn][]listname or map[asn][]asn
for list, asnList := range tmp.Want.TypeMap {
list = strings.ToUpper(strings.TrimSpace(list))
if list == "" {
continue
}
for _, asn := range asnList {
asn = strings.TrimPrefix(strings.ToLower(strings.TrimSpace(asn)), "as")
if asn == "" {
continue
}
if listArr, found := wantList[asn]; found {
listArr = append(listArr, list)
wantList[asn] = listArr
} else {
wantList[asn] = []string{list}
}
}
}
for _, asn := range tmp.Want.TypeSlice {
asn = strings.TrimPrefix(strings.ToLower(strings.TrimSpace(asn)), "as")
if asn == "" {
continue
}
wantList[asn] = []string{"AS" + asn}
}
return &GeoLite2ASNCSVIn{
Type: TypeGeoLite2ASNCSVIn,
Action: action,
Description: DescGeoLite2ASNCSVIn,
IPv4File: tmp.IPv4File,
IPv6File: tmp.IPv6File,
Want: wantList,
OnlyIPType: tmp.OnlyIPType,
}, nil
}
type GeoLite2ASNCSVIn struct {
Type string
Action lib.Action
Description string
IPv4File string
IPv6File string
Want map[string][]string
OnlyIPType lib.IPType
}
func (g *GeoLite2ASNCSVIn) GetType() string {
return g.Type
}
func (g *GeoLite2ASNCSVIn) GetAction() lib.Action {
return g.Action
}
func (g *GeoLite2ASNCSVIn) GetDescription() string {
return g.Description
}
func (g *GeoLite2ASNCSVIn) Input(container lib.Container) (lib.Container, error) {
entries := make(map[string]*lib.Entry)
if g.IPv4File != "" {
if err := g.process(g.IPv4File, entries); err != nil {
return nil, err
}
}
if g.IPv6File != "" {
if err := g.process(g.IPv6File, entries); err != nil {
return nil, err
}
}
if len(entries) == 0 {
return nil, fmt.Errorf("❌ [type %s | action %s] no entry is generated", g.Type, g.Action)
}
ignoreIPType := lib.GetIgnoreIPType(g.OnlyIPType)
for _, entry := range entries {
switch g.Action {
case lib.ActionAdd:
if err := container.Add(entry, ignoreIPType); err != nil {
return nil, err
}
case lib.ActionRemove:
if err := container.Remove(entry, lib.CaseRemovePrefix, ignoreIPType); err != nil {
return nil, err
}
default:
return nil, lib.ErrUnknownAction
}
}
return container, nil
}
func (g *GeoLite2ASNCSVIn) process(file string, entries map[string]*lib.Entry) error {
if entries == nil {
entries = make(map[string]*lib.Entry)
}
var f io.ReadCloser
var err error
switch {
case strings.HasPrefix(strings.ToLower(file), "http://"), strings.HasPrefix(strings.ToLower(file), "https://"):
f, err = lib.GetRemoteURLReader(file)
default:
f, err = os.Open(file)
}
if err != nil {
return err
}
defer f.Close()
reader := csv.NewReader(f)
reader.Read() // skip header
for {
record, err := reader.Read()
if err == io.EOF {
break
}
if err != nil {
return err
}
if len(record) < 2 {
return fmt.Errorf("❌ [type %s | action %s] invalid record: %v", g.Type, g.Action, record)
}
// Maxmind ASN CSV reference:
// network,autonomous_system_number,autonomous_system_organization
// 1.0.0.0/24,13335,CLOUDFLARENET
// 1.0.4.0/22,38803,"Gtelecom Pty Ltd"
// 1.0.16.0/24,2519,"ARTERIA Networks Corporation"
switch len(g.Want) {
case 0: // it means user wants all ASNs
asn := "AS" + strings.TrimSpace(record[1]) // default list name is in "AS12345" format
entry, got := entries[asn]
if !got {
entry = lib.NewEntry(asn)
}
if err := entry.AddPrefix(strings.TrimSpace(record[0])); err != nil {
return err
}
entries[asn] = entry
default: // it means user wants specific ASNs or customized lists with specific ASNs
if listArr, found := g.Want[strings.TrimSpace(record[1])]; found {
for _, listName := range listArr {
entry, got := entries[listName]
if !got {
entry = lib.NewEntry(listName)
}
if err := entry.AddPrefix(strings.TrimSpace(record[0])); err != nil {
return err
}
entries[listName] = entry
}
}
}
}
return nil
}
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