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refactoring in progress

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pull/18/head
Hugo Landau 10 years ago
parent e9bc74cd1e
commit 6752b7e7f9
2 changed files with 335 additions and 194 deletions
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8
namecoin.go
Unescape Escape View File

@ -81,6 +81,14 @@ func (nc *NamecoinConn) Query(name string) (v string, err error) {
v = `{"ns":["ns1.badger.bit","ns2.badger.bit"],"map":{"ns1":{"ip":["1.2.3.4"]},"ns2":{"ip":["2.3.4.5"]}},"ds":[[12345,8,2,"lu6y/9mwDNRpTngni179qwqARGVntp9jTaB48NkPAbo="]]}`
return
}
if name == "d/secure" {
v = `{"ns":["ns1.example.com","ns2.example.com"],"ds":[[12345,8,2,"lu6y/9mwDNRpTngni179qwqARGVntp9jTaB48NkPAbo="]]}`
return
}
if name == "d/insecure" {
v = `{"ns":["ns1.example.com","ns2.example.com"]}`
return
}
cmd, err := NewNameShowCmd(newID(), name)
if err != nil {

521
ncdns.go
Unescape Escape View File

@ -61,6 +61,7 @@ type ServerConfig struct {
NamecoinRPCPassword string `default:"" usage:"Namecoin RPC password"`
NamecoinRPCAddress string `default:"localhost:8336" usage:"Namecoin RPC server address"`
CacheMaxEntries int `default:"1000" usage:"Maximum name cache entries"`
SelfIP string `default:"127.127.127.127" usage:"The canonical IP address for this service"`
}
func (s *Server) doRunListener(ds *dns.Server) {
@ -258,6 +259,7 @@ func (ncv *ncValue) GetDSs() (dss []dns.DS, err error) {
// f[a]("", "a.b.c.d.e.f.g.zzz.bit")
var ErrNoSuchDomain = fmt.Errorf("no such domain")
var ErrNotNamecoin = fmt.Errorf("not a namecoin domain")
var ErrNoResults = fmt.Errorf("no results")
func stepName(n string) string {
@ -278,138 +280,194 @@ func stepName(n string) string {
return base32.HexEncoding.EncodeToString(b)
}
func (s *Server) addAnswersUnderNCValue(ncv *ncValue, subname, basename, rootname string, qtype uint16, res *dns.Msg, depth int) error {
func absname(n string) string {
if n == "" {
return "."
}
if n[len(n)-1] != '.' {
return n + "."
}
return n
}
func (tx *Tx) addAnswersUnderNCValueActual(ncv *ncValue, sn string) error {
toAdd := []dns.RR{}
toAddAuthority := []dns.RR{}
nss, nsserr := ncv.GetNSs()
log.Info("ncv sub=", subname, " base=", basename, " root=", rootname, " qtype=", qtype, " nss=", nss, " nsserr=", nsserr)
//log.Info("ncv isub=", isubname, " sub=", subname, " base=", tx.basename, " root=", tx.rootname, " qtype=", tx.qtype, " nss=", nss, " nsserr=", nsserr)
if nsserr == nil && len(nss) > 0 {
nsn := sn
if len(sn) > 0 {
nsn += "."
}
nsn += tx.basename + "." + tx.rootname
log.Info("ncv nsn=", nsn)
for _, ns := range nss {
toAddAuthority = append(toAddAuthority, &dns.NS {
Hdr: dns.RR_Header { Name: strings.TrimRight(basename, ".") + ".", Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: 60, },
Ns: strings.TrimRight(ns, ".") + ".",
Hdr: dns.RR_Header { Name: absname(nsn), Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: 60, },
Ns: absname(ns),
})
}
}
if subname != "" {
head, rest, err := splitDomainHead(subname)
if tx.istype(dns.TypeA) {
ips, err := ncv.GetIPs()
if err != nil {
return err
}
sub, ok := ncv.Map[head]
if !ok {
sub, ok = ncv.Map["*"]
if !ok {
return ErrNoSuchDomain
for _, ip := range ips {
pip := net.ParseIP(ip)
if pip == nil || pip.To4() == nil {
continue
}
toAdd = append(toAdd, &dns.A {
Hdr: dns.RR_Header { Name: absname(tx.qname), Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60, },
A: pip })
}
return s.addAnswersUnderNCValue(sub, rest, head + "." + basename, rootname, qtype, res, depth+1)
}
switch qtype {
case dns.TypeA:
ips, err := ncv.GetIPs()
if err != nil {
return err
}
for _, ip := range ips {
pip := net.ParseIP(ip)
if pip == nil || pip.To4() == nil {
continue
}
toAdd = append(toAdd, &dns.A {
Hdr: dns.RR_Header { Name: basename, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60, },
A: pip })
}
case dns.TypeAAAA:
ips, err := ncv.GetIP6s()
if err != nil {
return err
}
if tx.istype(dns.TypeAAAA) {
ips, err := ncv.GetIP6s()
if err != nil {
return err
}
for _, ip := range ips {
pip := net.ParseIP(ip)
if pip == nil || pip.To4() != nil {
continue
}
toAdd = append(toAdd, &dns.AAAA {
Hdr: dns.RR_Header { Name: basename, Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: 60, },
AAAA: pip })
for _, ip := range ips {
pip := net.ParseIP(ip)
if pip == nil || pip.To4() != nil {
continue
}
toAdd = append(toAdd, &dns.AAAA {
Hdr: dns.RR_Header { Name: absname(tx.qname), Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: 60, },
AAAA: pip })
}
}
case dns.TypeNS:
if nsserr != nil {
return nsserr
}
if tx.istype(dns.TypeNS) && len(toAddAuthority) == 0 {
if nsserr != nil {
return nsserr
}
for _, ns := range nss {
ns = strings.TrimRight(ns, ".") + "."
toAdd = append(toAdd, &dns.NS {
Hdr: dns.RR_Header { Name: basename, Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: 60, },
Ns: ns })
}
for _, ns := range nss {
ns = absname(ns)
toAdd = append(toAdd, &dns.NS {
Hdr: dns.RR_Header { Name: absname(tx.qname), Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: 60, },
Ns: ns })
}
}
case dns.TypeTXT:
//case dns.TypeTXT:
// TODO
case dns.TypeMX:
//case dns.TypeMX:
// TODO
case dns.TypeSRV:
//case dns.TypeSRV:
// TODO
case dns.TypeDS:
dss, err := ncv.GetDSs()
if err != nil {
return err
}
for i := range dss {
dss[i].Hdr.Name = basename
toAdd = append(toAdd, &dss[i])
}
log.Info("ds: ", dss, " ", err)
if tx.istype(dns.TypeDS) {
dss, err := ncv.GetDSs()
if err != nil {
return err
}
default:
// ...
for i := range dss {
dss[i].Hdr.Name = absname(tx.qname)
toAddAuthority = append(toAddAuthority, &dss[i])
}
log.Info("ds: ", dss, " ", err)
}
if len(toAdd) == 0 && len(toAddAuthority) == 0 {
// we didn't get anything, so try the "" entry in the map
if m, ok := ncv.Map[""]; ok {
return s.addAnswersUnderNCValue(m, "", basename, rootname, qtype, res, depth+1)
return tx.addAnswersUnderNCValueActual(m, sn)
}
}
for i := range toAdd {
res.Answer = append(res.Answer, toAdd[i])
tx.res.Answer = append(tx.res.Answer, toAdd[i])
}
if qtype != dns.TypeDS {
if tx.qtype != dns.TypeDS {
for i := range toAddAuthority {
res.Ns = append(res.Ns, toAddAuthority[i])
tx.res.Ns = append(tx.res.Ns, toAddAuthority[i])
}
}
return nil
}
func (s *Server) addAnswersUnderDomain(d *Domain, subname, basename, rootname string, qtype uint16, res *dns.Msg) error {
err := s.addAnswersUnderNCValue(d.ncv, subname, basename, rootname, qtype, res, 0)
func (tx *Tx) _findNCValue(ncv *ncValue, isubname, subname string, depth int,
shortCircuitFunc func(curNCV *ncValue) bool) (xncv *ncValue, sn string, err error) {
if shortCircuitFunc != nil && shortCircuitFunc(ncv) {
return ncv, subname, nil
}
if isubname != "" {
head, rest, err := splitDomainHead(isubname)
if err != nil {
return nil, "", err
}
sub, ok := ncv.Map[head]
if !ok {
sub, ok = ncv.Map["*"]
if !ok {
return nil, "", ErrNoSuchDomain
}
}
return tx._findNCValue(sub, rest, head + "." + subname, depth+1, shortCircuitFunc)
}
if shortCircuitFunc != nil {
return nil, subname, ErrNoSuchDomain
}
return ncv, subname, nil
}
func (tx *Tx) findNCValue(ncv *ncValue, subname string,
shortCircuitFunc func(curNCV *ncValue) bool) (xncv *ncValue, sn string, err error) {
return tx._findNCValue(ncv, subname, "", 0, shortCircuitFunc)
}
func hasNS(ncv *ncValue) bool {
nss, err := ncv.GetNSs()
return err == nil && len(nss) > 0
}
func (tx *Tx) addAnswersUnderNCValue(rncv *ncValue, subname string) error {
ncv, sn, err := tx.findNCValue(rncv, subname, hasNS)
if err != nil {
return err
}
log.Info("ncv actual: ", sn)
return tx.addAnswersUnderNCValueActual(ncv, sn)
}
func (tx *Tx) addAnswersUnderDomain(d *Domain) error {
err := tx.addAnswersUnderNCValue(d.ncv, tx.subname)
if err == ErrNoResults {
err = nil
}
return err
}
func (s *Server) determineDomain(qname string) (subname, basename, rootname string, err error) {
func (tx *Tx) determineDomain() (subname, basename, rootname string, err error) {
qname := tx.qname
qname = strings.TrimRight(qname, ".")
parts := strings.Split(qname, ".")
if len(parts) < 2 {
if parts[0] != "bit" {
err = ErrNotNamecoin
return
}
rootname = parts[0]
return
}
@ -431,64 +489,74 @@ func (s *Server) determineDomain(qname string) (subname, basename, rootname stri
}
}
err = fmt.Errorf("not a namecoin domain: ", qname)
err = ErrNotNamecoin
return
}
func (s *Server) addMetaAnswers(subname, basename, rootname string, qtype uint16, res *dns.Msg) error {
switch subname {
func (tx *Tx) addMetaAnswers() error {
ip := net.ParseIP(tx.s.cfg.SelfIP)
if ip == nil || ip.To4() == nil {
return fmt.Errorf("invalid value specified for SelfIP")
}
switch tx.subname {
case "this":
switch qtype {
case dns.TypeA, dns.TypeANY:
res.Answer = append(res.Answer, &dns.A {
Hdr: dns.RR_Header {
Name: subname + "." + basename + "." + rootname + ".",
Ttl: 86400,
Class: dns.ClassINET,
Rrtype: dns.TypeA,
},
A: net.IPv4(127,127,127,127),
})
default:
if tx.istype(dns.TypeA) {
tx.res.Answer = append(tx.res.Answer, &dns.A {
Hdr: dns.RR_Header {
Name: tx.subname + "." + tx.basename + "." + tx.rootname + ".",
Ttl: 86400,
Class: dns.ClassINET,
Rrtype: dns.TypeA,
},
A: ip,
})
}
case "":
default:
tx.setRcode(dns.RcodeNameError)
}
return nil
}
func (s *Server) addRootAnswers(rootname string, qtype uint16, res *dns.Msg) error {
//useKSK := false
func (tx *Tx) addRootSOA() error {
soa := &dns.SOA {
Hdr: dns.RR_Header {
Name: absname(tx.rootname),
Ttl: 86400,
Class: dns.ClassINET,
Rrtype: dns.TypeSOA,
},
Ns: absname("this.x--nmc." + tx.rootname),
Mbox: ".",
Serial: 1,
Refresh: 600,
Retry: 600,
Expire: 7200,
Minttl: 600,
}
if tx.istype(dns.TypeSOA) && absname(tx.rootname) == absname(tx.qname) {
tx.res.Answer = append(tx.res.Answer, soa)
} else {
tx.res.Ns = append(tx.res.Ns, soa)
}
return nil
}
s.zsk.Hdr.Name = rootname + "."
func (tx *Tx) istype(x uint16) bool {
return tx.qtype == x || tx.qtype == dns.TypeANY
}
if qtype != dns.TypeNS && qtype != dns.TypeDNSKEY {
soa := &dns.SOA {
Hdr: dns.RR_Header {
Name: rootname + ".",
Ttl: 86400,
Class: dns.ClassINET,
Rrtype: dns.TypeSOA,
},
Ns: "this.x--nmc.bit.",
Mbox: ".",
Serial: 1,
Refresh: 600,
Retry: 600,
Expire: 7200,
Minttl: 600,
}
if qtype == dns.TypeSOA || qtype == dns.TypeANY {
res.Answer = append(res.Answer, soa)
} else {
res.Ns = append(res.Ns, soa)
}
}
func (tx *Tx) addRootAnswers() error {
//useKSK := false
tx.s.zsk.Hdr.Name = tx.rootname + "."
if qtype == dns.TypeNS || qtype == dns.TypeANY {
res.Answer = append(res.Answer, &dns.NS {
if tx.istype(dns.TypeNS) {
tx.res.Answer = append(tx.res.Answer, &dns.NS {
Hdr: dns.RR_Header {
Name: rootname + ".",
Name: absname(tx.rootname),
Ttl: 86400,
Class: dns.ClassINET,
Rrtype: dns.TypeNS,
@ -497,26 +565,30 @@ func (s *Server) addRootAnswers(rootname string, qtype uint16, res *dns.Msg) err
})
}
if qtype == dns.TypeDNSKEY || qtype == dns.TypeANY {
res.Answer = append(res.Answer, s.ksk)
res.Answer = append(res.Answer, &s.zsk)
if tx.istype(dns.TypeDNSKEY) {
tx.s.ksk.Hdr.Name = absname(tx.rootname)
tx.s.zsk.Hdr.Name = tx.s.ksk.Hdr.Name
tx.res.Answer = append(tx.res.Answer, tx.s.ksk)
tx.res.Answer = append(tx.res.Answer, &tx.s.zsk)
//useKSK = true
}
log.Info("addRootAnswers/sr")
/*err := s.signResponse(res, useKSK, rootname)
if err != nil {
log.Infoe(err, "/sr")
return err
}*/
if len(tx.res.Answer) == 0 || tx.istype(dns.TypeSOA) {
err := tx.addRootSOA()
if err != nil {
return err
}
}
log.Info("done sr")
return nil
}
func (s *Server) signRRs(rra []dns.RR, useKSK bool, rootname string) (dns.RR, error) {
func (tx *Tx) signRRs(rra []dns.RR, useKSK bool) (dns.RR, error) {
if len(rra) == 0 {
return nil, fmt.Errorf("no RRs to such")
}
@ -527,14 +599,14 @@ func (s *Server) signRRs(rra []dns.RR, useKSK bool, rootname string) (dns.RR, er
Algorithm: dns.RSASHA256,
Expiration: uint32(now.Add(time.Duration(10)*time.Minute).Unix()),
Inception: uint32(now.Unix()),
SignerName: rootname + ".",
SignerName: tx.rootname + ".",
}
pk := s.zskPrivate
pk := tx.s.zskPrivate
if useKSK {
pk = s.kskPrivate
rrsig.KeyTag = s.ksk.KeyTag()
pk = tx.s.kskPrivate
rrsig.KeyTag = tx.s.ksk.KeyTag()
} else {
rrsig.KeyTag = s.zsk.KeyTag()
rrsig.KeyTag = tx.s.zsk.KeyTag()
}
err := rrsig.Sign(pk, rra)
@ -545,19 +617,23 @@ func (s *Server) signRRs(rra []dns.RR, useKSK bool, rootname string) (dns.RR, er
return rrsig, nil
}
func shouldSignType(t uint16) bool {
func shouldSignType(t uint16, isAuthoritySection bool) bool {
//log.Info("shouldSignType ", t, " ", isAuthoritySection)
switch t {
case dns.TypeOPT:
return false
case dns.TypeNS:
return !isAuthoritySection
default:
return true
}
}
func (s *Server) signResponseSection(rra *[]dns.RR, useKSK bool, rootname string) error {
func (tx *Tx) signResponseSection(rra *[]dns.RR, useKSK bool) error {
if len(*rra) == 0 {
return nil
}
//log.Info("sign section: ", *rra)
i := 0
a := []dns.RR{}
@ -577,8 +653,8 @@ func (s *Server) signResponseSection(rra *[]dns.RR, useKSK bool, rootname string
i++
}
if shouldSignType(t) {
srr, err := s.signRRs(a, useKSK, rootname)
if shouldSignType(pt, (rra == &tx.res.Ns) ) {
srr, err := tx.signRRs(a, useKSK)
if err != nil {
return err
}
@ -590,25 +666,24 @@ func (s *Server) signResponseSection(rra *[]dns.RR, useKSK bool, rootname string
a = []dns.RR{}
}
return nil
}
func useDNSSEC(msg *dns.Msg) bool {
opt := msg.IsEdns0()
func (tx *Tx) useDNSSEC() bool {
opt := tx.req.IsEdns0()
if opt == nil {
return false
}
return opt.Do()
}
func (s *Server) signResponse(res *dns.Msg, useKSK bool, rootname string) error {
if !useDNSSEC(res) {
func (tx *Tx) signResponse(useKSK bool) error {
if !tx.useDNSSEC() {
return nil
}
for _, r := range []*[]dns.RR { &res.Answer, &res.Ns, &res.Extra } {
err := s.signResponseSection(r, useKSK, rootname)
for _, r := range []*[]dns.RR { &tx.res.Answer, &tx.res.Ns, &tx.res.Extra } {
err := tx.signResponseSection(r, useKSK)
if err != nil {
log.Infoe(err, "fail signResponse")
return err
@ -632,19 +707,19 @@ func (p uint16Slice) Len() int { return len(p) }
func (p uint16Slice) Less(i, j int) bool { return p[i] < p[j] }
func (p uint16Slice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
func (s *Server) addNSEC3RR(basename, rootname, qname string, qtype uint16, res *dns.Msg) error {
func (tx *Tx) addNSEC3RR() error {
// Map of what possibly exists
m := map[uint16]struct{}{}
for _, rr := range res.Answer {
for _, rr := range tx.res.Answer {
// Definitely exists
m[rr.Header().Rrtype] = struct{}{}
}
// If qtype is ANY, the only record types which exist are those we found above.
if qtype != dns.TypeANY {
if tx.qtype != dns.TypeANY {
// Any record type which wasn't the one we asked for might exist.
for _, t := range allPossibleTypes {
if t != qtype {
if t != tx.qtype {
m[t] = struct{}{}
}
}
@ -658,12 +733,12 @@ func (s *Server) addNSEC3RR(basename, rootname, qname string, qtype uint16, res
// The DNS library is buggy unless tbm is sorted.
sort.Sort(uint16Slice(tbm))
log.Info("NSEC3: qname=", qname, " base=", basename, " root=", rootname)
nsr1n := dns.HashName(qname, dns.SHA1, 1, "8F")
log.Info("NSEC3: qname=", tx.qname, " base=", tx.basename, " root=", tx.rootname)
nsr1n := dns.HashName(tx.qname, dns.SHA1, 1, "8F")
nsr1nn := stepName(nsr1n)
nsr1 := &dns.NSEC3 {
Hdr: dns.RR_Header {
Name: nsr1n + "." + rootname + ".",
Name: nsr1n + "." + tx.rootname + ".",
Rrtype: dns.TypeNSEC3,
Class: dns.ClassINET,
Ttl: 600,
@ -677,12 +752,12 @@ func (s *Server) addNSEC3RR(basename, rootname, qname string, qtype uint16, res
NextDomain: nsr1nn,
TypeBitMap: tbm,
}
res.Ns = append(res.Ns, nsr1)
tx.res.Ns = append(tx.res.Ns, nsr1)
return nil
}
func (s *Server) addNSEC(basename, rootname, qname string, qtype uint16, res *dns.Msg) error {
if !useDNSSEC(res) {
func (tx *Tx) addNSEC() error {
if !tx.useDNSSEC() {
return nil
}
@ -694,9 +769,9 @@ func (s *Server) addNSEC(basename, rootname, qname string, qtype uint16, res *dn
// - Wildcard, data response
// - Name error response
// - Direct NSEC request
if len(res.Answer) == 0 /*&& qtype != dns.TypeDS*/ {
if len(tx.res.Answer) == 0 /*&& qtype != dns.TypeDS*/ {
log.Info("adding NSEC3")
err := s.addNSEC3RR(basename, rootname, qname, qtype, res)
err := tx.addNSEC3RR()
if err != nil {
return err
}
@ -713,33 +788,43 @@ func (s *Server) addNSEC(basename, rootname, qname string, qtype uint16, res *dn
return nil
}
func (s *Server) addAnswersMain(subname, basename, rootname, qname string, qtype uint16, res *dns.Msg) error {
if rootname == "" {
func (tx *Tx) setRcode(x int) {
if tx.rcode == 0 {
tx.rcode = x
}
}
func (tx *Tx) addAnswersMain() error {
if tx.rootname == "" {
tx.setRcode(dns.RcodeRefused)
return ErrNoRoot
}
if basename == "x--nmc" {
return s.addMetaAnswers(subname, basename, rootname, qtype, res)
if tx.basename == "x--nmc" {
return tx.addMetaAnswers()
}
if subname == "" && basename == "" {
err := s.addRootAnswers(rootname, qtype, res)
if tx.subname == "" && tx.basename == "" {
err := tx.addRootAnswers()
return err
}
ncname, err := toNamecoinName(basename)
ncname, err := toNamecoinName(tx.basename)
if err != nil {
log.Infoe(err, "cannot determine namecoin name")
return err
}
d, err := s.getNamecoinEntry(ncname)
d, err := tx.s.getNamecoinEntry(ncname)
if err != nil {
log.Infoe(err, "cannot get namecoin entry")
if err == ErrNoSuchDomain {
tx.setRcode(dns.RcodeNameError)
}
return err
}
err = s.addAnswersUnderDomain(d, subname, basename + "." + rootname + ".", rootname, qtype, res)
err = tx.addAnswersUnderDomain(d)
if err != nil {
log.Infoe(err, "cannot add answers")
return err
@ -748,28 +833,55 @@ func (s *Server) addAnswersMain(subname, basename, rootname, qname string, qtype
return nil
}
func (s *Server) addAnswers(qname string, qtype uint16, res *dns.Msg) error {
subname, basename, rootname, err := s.determineDomain(qname)
func (tx *Tx) addAnswersMainOuter() error {
err := tx.addAnswersMain()
if len(tx.res.Answer) == 0 && len(tx.res.Ns) > 0 {
tx.res.Authoritative = false
}
// Do not use istype here, we do not want to match ANY
if err == nil && !(len(tx.res.Answer) == 0 && tx.qtype == dns.TypeDS) {
return nil
}
// If an error occurred, and we have NXDOMAIN, add SOA
err2 := tx.addRootSOA()
if err2 != nil {
// currently, let the first error take precedence
}
return err
}
func (tx *Tx) addAnswers() error {
var err error
tx.subname, tx.basename, tx.rootname, err = tx.determineDomain()
if err != nil {
log.Infoe(err, "cannot determine domain name")
log.Infoe(err, "cannot determine domain name, refusing")
tx.setRcode(dns.RcodeRefused)
return err
}
log.Info("DD: sub=", subname, " base=", basename, " root=", rootname)
log.Info("DD: sub=", tx.subname, " base=", tx.basename, " root=", tx.rootname)
err = s.addAnswersMain(subname, basename, rootname, qname, qtype, res)
err = tx.addAnswersMainOuter()
if err != nil {
return err
// eat name errors
if err != ErrNoSuchDomain {
return err
}
}
err = s.addNSEC(basename, rootname, qname, qtype, res)
err = tx.addNSEC()
if err != nil {
log.Infoe(err, "cannot add NSEC")
return err
}
useKSK := (qtype == dns.TypeDNSKEY)
err = s.signResponse(res, useKSK, rootname)
// XXX
useKSK := (tx.qtype == dns.TypeDNSKEY)
err = tx.signResponse(useKSK)
if err != nil {
log.Infoe(err, "cannot sign response")
return err
@ -778,39 +890,60 @@ func (s *Server) addAnswers(qname string, qtype uint16, res *dns.Msg) error {
return nil
}
func (s *Server) handle(rw dns.ResponseWriter, req *dns.Msg) {
res := dns.Msg{}
res.SetReply(req)
res.Authoritative = true
res.Compress = true
opt := req.IsEdns0()
type Tx struct {
req *dns.Msg
res *dns.Msg
qname string
qtype uint16
qclass uint16
s *Server
rcode int
subname string // the subname: www.bitcoin.bit -> "www", bitcoin.bit -> ""
basename string // the basename: bitcoin.bit -> "bitcoin"
rootname string // the TLD: bitcoin.bit -> "bit", bitcoin.bit.example.com -> "bit.example.com"
}
func (s *Server) handle(rw dns.ResponseWriter, reqMsg *dns.Msg) {
tx := Tx{}
tx.req = reqMsg
tx.res = &dns.Msg{}
tx.res.SetReply(tx.req)
tx.res.Authoritative = true
tx.res.Compress = true
tx.s = s
tx.rcode = 0
opt := tx.req.IsEdns0()
if opt != nil {
res.Extra = append(res.Extra, opt)
tx.res.Extra = append(tx.res.Extra, opt)
}
for _, q := range req.Question {
for _, q := range tx.req.Question {
tx.qname = strings.ToLower(q.Name)
tx.qtype = q.Qtype
tx.qclass = q.Qclass
if q.Qclass != dns.ClassINET && q.Qclass != dns.ClassANY {
continue
}
err := s.addAnswers(q.Name, q.Qtype, &res)
if err == ErrNoSuchDomain {
res.SetRcode(req, dns.RcodeNameError)
break
} else if err == ErrNoRoot {
res.SetRcode(req, dns.RcodeRefused)
break
} else if err != nil {
// TODO
log.Infoe(err, "Could not determine answer for query, doing SERVFAIL.")
res.SetRcode(req, dns.RcodeServerFailure)
err := tx.addAnswers()
if err != nil {
if tx.rcode == 0 {
log.Infoe(err, "Handler error, doing SERVFAIL")
tx.rcode = dns.RcodeServerFailure
}
break
}
}
tx.res.SetRcode(tx.req, tx.rcode)
//log.Info("response: ", res.String())
err := rw.WriteMsg(&res)
log.Infoe(err, "Couldn't write response: " + res.String())
err := rw.WriteMsg(tx.res)
log.Infoe(err, "Couldn't write response: " + tx.res.String())
}
func (s *Server) Run() {

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