316 lines
8.6 KiB
Go
316 lines
8.6 KiB
Go
package main
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import (
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"fmt"
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"log"
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"net"
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"os"
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"path"
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"strings"
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"time"
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"github.com/miekg/dns"
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)
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var reqTypes map[uint16]string
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var weekdays []string
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type logItem struct {
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clientIP string
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name string
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reqType uint16
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config string
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timetable string
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killed string
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}
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// logChannel used by logging thread
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var logChannel chan logItem
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func init() {
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weekdays = []string{"Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"}
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if len(ZabovDebugDBPath) > 0 {
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os.MkdirAll(ZabovDebugDBPath, 0755)
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}
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reqTypes = map[uint16]string{
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dns.TypeNone: "TypeNone",
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dns.TypeA: "TypeA",
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dns.TypeNS: "TypeNS",
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dns.TypeMD: "TypeMD",
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dns.TypeMF: "TypeMF",
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dns.TypeCNAME: "TypeCNAME",
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dns.TypeSOA: "TypeSOA",
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dns.TypeMB: "TypeMB",
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dns.TypeMG: "TypeMG",
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dns.TypeMR: "TypeMR",
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dns.TypeNULL: "TypeNULL",
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dns.TypePTR: "TypePTR",
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dns.TypeHINFO: "TypeHINFO",
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dns.TypeMINFO: "TypeMINFO",
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dns.TypeMX: "TypeMX",
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dns.TypeTXT: "TypeTXT",
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dns.TypeRP: "TypeRP",
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dns.TypeAFSDB: "TypeAFSDB",
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dns.TypeX25: "TypeX25",
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dns.TypeISDN: "TypeISDN",
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dns.TypeRT: "TypeRT",
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dns.TypeNSAPPTR: "TypeNSAPPTR",
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dns.TypeSIG: "TypeSIG",
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dns.TypeKEY: "TypeKEY",
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dns.TypePX: "TypePX",
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dns.TypeGPOS: "TypeGPOS",
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dns.TypeAAAA: "TypeAAAA",
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dns.TypeLOC: "TypeLOC",
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dns.TypeNXT: "TypeNXT",
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dns.TypeEID: "TypeEID",
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dns.TypeNIMLOC: "TypeNIMLOC",
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dns.TypeSRV: "TypeSRV",
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dns.TypeATMA: "TypeATMA",
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dns.TypeNAPTR: "TypeNAPTR",
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dns.TypeKX: "TypeKX",
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dns.TypeCERT: "TypeCERT",
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dns.TypeDNAME: "TypeDNAME",
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dns.TypeOPT: "TypeOPT",
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dns.TypeAPL: "TypeAPL",
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dns.TypeDS: "TypeDS",
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dns.TypeSSHFP: "TypeSSHFP",
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dns.TypeRRSIG: "TypeRRSIG",
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dns.TypeNSEC: "TypeNSEC",
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dns.TypeDNSKEY: "TypeDNSKEY",
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dns.TypeDHCID: "TypeDHCID",
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dns.TypeNSEC3: "TypeNSEC3",
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dns.TypeNSEC3PARAM: "TypeNSEC3PARAM",
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dns.TypeTLSA: "TypeTLSA",
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dns.TypeSMIMEA: "TypeSMIMEA",
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dns.TypeHIP: "TypeHIP",
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dns.TypeNINFO: "TypeNINFO",
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dns.TypeRKEY: "TypeRKEY",
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dns.TypeTALINK: "TypeTALINK",
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dns.TypeCDS: "TypeCDS",
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dns.TypeCDNSKEY: "TypeCDNSKEY",
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dns.TypeOPENPGPKEY: "TypeOPENPGPKEY",
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dns.TypeCSYNC: "TypeCSYNC",
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dns.TypeSPF: "TypeSPF",
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dns.TypeUINFO: "TypeUINFO",
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dns.TypeUID: "TypeUID",
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dns.TypeGID: "TypeGID",
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dns.TypeUNSPEC: "TypeUNSPEC",
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dns.TypeNID: "TypeNID",
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dns.TypeL32: "TypeL32",
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dns.TypeL64: "TypeL64",
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dns.TypeLP: "TypeLP",
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dns.TypeEUI48: "TypeEUI48",
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dns.TypeEUI64: "TypeEUI64",
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dns.TypeURI: "TypeURI",
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dns.TypeCAA: "TypeCAA",
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dns.TypeAVC: "TypeAVC",
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dns.TypeTKEY: "TypeTKEY",
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dns.TypeTSIG: "TypeTSIG",
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dns.TypeIXFR: "TypeIXFR",
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dns.TypeAXFR: "TypeAXFR",
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dns.TypeMAILB: "TypeMAILB",
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dns.TypeMAILA: "TypeMAILA",
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dns.TypeANY: "TypeANY",
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dns.TypeTA: "TypeTA",
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dns.TypeDLV: "TypeDLV",
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dns.TypeReserved: "TypeReserved"}
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fmt.Println("Local Time:", getLocalTime().Format(time.ANSIC))
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if len(ZabovDebugDBPath) > 0 {
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logChannel = make(chan logItem, 1024)
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go logWriteThread()
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}
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}
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func logWriteThread() {
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for item := range logChannel {
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var header string
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d := time.Now().Format("2006-01-02")
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logpath := path.Join(ZabovDebugDBPath, strings.Replace(item.clientIP, ":", "_", -1)+"-"+d+".log")
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_, err1 := os.Stat(logpath)
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if os.IsNotExist(err1) {
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header = strings.Join([]string{"time", "clientIP", "name", "reqType", "config", "timetable", "killed"}, "\t")
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}
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f, err := os.OpenFile(logpath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
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if err == nil {
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reqTypeName, err := reqTypes[item.reqType]
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if !err {
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reqTypeName = fmt.Sprintf("%d", item.reqType)
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}
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ct := time.Now().Format(time.RFC3339)
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log := strings.Join([]string{ct, item.clientIP, strings.TrimRight(item.name, "."), reqTypeName, item.config, item.timetable, item.killed}, "\t")
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if len(header) > 0 {
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f.Write([]byte(header))
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f.Write([]byte("\n"))
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}
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f.Write([]byte(log))
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f.Write([]byte("\n"))
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f.Close()
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}
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}
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}
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func logQuery(clientIP string, name string, reqType uint16, config string, timetable string, killed string) {
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if len(ZabovDebugDBPath) > 0 {
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k := logItem{clientIP: clientIP, name: name, reqType: reqType, config: config, timetable: timetable, killed: killed}
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logChannel <- k
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}
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}
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func getLocalTime() time.Time {
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return time.Now().Local()
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}
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func confFromTimeTable(timetable string) string {
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tt := ZabovTimetables[timetable]
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if tt == nil {
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if ZabovDebug {
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log.Println("confFromTimeTable: return default")
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}
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return "default"
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}
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for _, ttentry := range tt.table {
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now := getLocalTime()
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nowHour := now.Hour()
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nowMinute := now.Minute()
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weekday := weekdays[now.Weekday()]
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if ttentry.days == nil || len(ttentry.days) == 0 || ttentry.days[weekday] || ttentry.days[strings.ToLower(weekday)] {
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for _, t := range ttentry.times {
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if (nowHour > t.start.hour || (nowHour == t.start.hour && nowMinute >= t.start.minute)) &&
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(nowHour < t.stop.hour || (nowHour == t.stop.hour && nowMinute <= t.stop.minute)) {
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go incrementStats("TIMETABLE IN: "+timetable, 1)
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if ZabovDebug {
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log.Println("confFromTimeTable: return IN", tt.cfgin)
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}
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return tt.cfgin
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}
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}
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}
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}
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go incrementStats("TIMETABLE OUT: "+timetable, 1)
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if ZabovDebug {
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log.Println("confFromTimeTable: return OUT", tt.cfgout)
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}
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return tt.cfgout
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}
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func confFromIP(clientIP net.IP) (string, string) {
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for _, ipgroup := range ZabovIPGroups {
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for _, ip := range ipgroup.ips {
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if clientIP.Equal(ip) {
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if len(ipgroup.timetable) > 0 {
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return confFromTimeTable(ipgroup.timetable), ipgroup.timetable
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}
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if ZabovDebug {
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log.Println("confFromIP: ipgroup.cfg", ipgroup.cfg)
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}
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return ipgroup.cfg, ""
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}
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}
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}
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if len(ZabovDefaultTimetable) > 0 {
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return confFromTimeTable(ZabovDefaultTimetable), ZabovDefaultTimetable
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}
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if ZabovDebug {
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log.Println("confFromIP: return default")
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}
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return "default", ""
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}
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func (mydns *handler) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
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go incrementStats("TotalQueries", 1)
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remIP, _, e := net.SplitHostPort(w.RemoteAddr().String())
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if e != nil {
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go incrementStats("CLIENT ERROR: "+remIP, 1)
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} else {
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go incrementStats("CLIENT: "+remIP, 1)
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}
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msg := dns.Msg{}
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msg.SetReply(r)
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config, timetable := confFromIP(net.ParseIP(remIP))
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if ZabovDebug {
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log.Println("REQUEST:", remIP, config)
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}
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ZabovConfig := ZabovConfigs[config]
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QType := r.Question[0].Qtype
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switch QType {
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case dns.TypeA:
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msg.Authoritative = true
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domain := msg.Question[0].Name
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fqdn := strings.TrimRight(domain, ".")
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if ZabovDebug {
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log.Println("TypeA: fqdn:", fqdn)
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}
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if len(ZabovIPAliases[fqdn]) > 0 {
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config = "__aliases__"
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msg.Answer = append(msg.Answer, &dns.A{
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Hdr: dns.RR_Header{Name: domain, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
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A: net.ParseIP(ZabovIPAliases[fqdn]),
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})
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go logQuery(remIP, fqdn, QType, config, timetable, "alias")
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break
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}
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if len(ZabovLocalResponder) > 0 {
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if !strings.Contains(fqdn, ".") ||
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(len(ZabovLocalDomain) > 0 && strings.HasSuffix(fqdn, ZabovLocalDomain)) {
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config = "__localresponder__"
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ret := ForwardQuery(r, config, true)
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w.WriteMsg(ret)
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go logQuery(remIP, fqdn, QType, config, timetable, "localresponder")
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break
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}
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}
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if domainInKillfile(fqdn, config) {
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go incrementStats("Killed", 1)
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msg.Answer = append(msg.Answer, &dns.A{
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Hdr: dns.RR_Header{Name: domain, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
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A: net.ParseIP(ZabovConfig.ZabovAddBL),
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})
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go logQuery(remIP, fqdn, QType, config, timetable, "killed")
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} else {
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go logQuery(remIP, fqdn, QType, config, timetable, "forwarded")
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ret := ForwardQuery(r, config, false)
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w.WriteMsg(ret)
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}
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case dns.TypePTR:
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if ZabovDebug {
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log.Println("TypePTR: Name:", msg.Question[0].Name)
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}
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if len(ZabovLocalResponder) > 0 {
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// if set use local responder for reverse lookup (suffix ".in-addr.arpa.")
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config = "__localresponder__"
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}
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ret := ForwardQuery(r, config, true)
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w.WriteMsg(ret)
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go logQuery(remIP, msg.Question[0].Name, QType, config, timetable, "localresponder")
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default:
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ret := ForwardQuery(r, config, false)
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w.WriteMsg(ret)
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if len(ZabovDebugDBPath) > 0 {
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go logQuery(remIP, msg.Question[0].Name, QType, config, timetable, "forwarded")
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}
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}
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go incrementStats("CONFIG: "+config, 1)
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w.WriteMsg(&msg)
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}
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