func TestDNSUpstreamEncoding(t *testing.T) {
var tmp [60]byte
bad_domain := "www." + base32.StdEncoding.EncodeToString(tmp[:]) + "."
if _, good := dns.IsDomainName(bad_domain); good {
t.Errorf("Bad domain not detected: %v", bad_domain)
}
codec, err := NewDNSTransportUpstreamCodec("blahgeek.com")
if err != nil {
t.Fatalf("Unable to build codec: %v", err)
}
streamer := DNSTransportStream{codec: codec}
for i := 0; i < 1500; i += 1 {
var msg []byte
for j := 0; j < i; j += 1 {
msg = append(msg, byte(rand.Int()&0xff))
}
var decoded_msg []byte
upstreams := streamer.Encode(msg)
for _, d := range upstreams {
t.Logf("Encoded domain for msg length %v: %v", i, d)
if _, good := dns.IsDomainName(d); !good {
t.Errorf("Bad domain for msg length %v", i)
}
decoded_msg = streamer.Decode(d)
}
if bytes.Compare(decoded_msg, msg) != 0 {
t.Errorf("Decoded msg != msg")
}
}
}
func discoverDNS(domain string, port int) (servers []string, ttl time.Duration, err error) {
r, _ := region()
// all DNS queries must use the FQDN
domain = "txt." + r + "." + dns.Fqdn(domain)
if _, ok := dns.IsDomainName(domain); !ok {
err = fmt.Errorf("invalid domain name: '%s' is not a domain name", domain)
return
}
regionRecords, ttl, err := retryingFindTXT(domain)
if err != nil {
return
}
for _, az := range regionRecords {
instances, _, er := retryingFindTXT("txt." + dns.Fqdn(az))
if er != nil {
continue
}
for _, instance := range instances {
// format the service URL
servers = append(servers, fmt.Sprintf("http://%s:%d/eureka/v2", instance, port))
}
}
return
}
// standardAddress parses an address string into a structured format with separate
// host, and port portions, as well as the original input string.
func standardAddress(str string) (address, error) {
var err error
// first check for scheme and strip it off
input := str
// separate host and port
host, port, err := net.SplitHostPort(str)
if err != nil {
host, port, err = net.SplitHostPort(str + ":")
// no error check here; return err at end of function
}
if len(host) > 255 {
return address{}, fmt.Errorf("specified address is too long: %d > 255", len(host))
}
_, d := dns.IsDomainName(host)
if !d {
return address{}, fmt.Errorf("host is not a valid domain: %s", host)
}
// see if we can set port based off scheme
if port == "" {
port = "53"
}
return address{Original: input, Host: strings.ToLower(dns.Fqdn(host)), Port: port}, err
}
// update record
func updateRecord(r dns.RR, q *dns.Question) {
// record to update
var rr dns.RR
// IP of record
var ip net.IP
header := r.Header()
if _, ok := dns.IsDomainName(header.Name); ok {
if header.Class == dns.ClassANY && header.Rdlength == 0 { // Delete record
deleteRecord(header.Name, header.Rrtype)
} else { // Add record
rheader := dns.RR_Header{
Name: header.Name,
Rrtype: header.Rrtype,
Class: dns.ClassINET,
Ttl: header.Ttl,
}
// IPv4 only
if a, ok := r.(*dns.A); ok {
rrr, err := getRecord(header.Name, header.Rrtype)
if err == nil {
rr = rrr.(*dns.A)
} else {
rr = new(dns.A)
}
ip = a.A
rr.(*dns.A).Hdr = rheader
rr.(*dns.A).A = ip
saveRecord(rr)
}
}
}
}
func getKey(domain string, rtype uint16) (r string, e error) {
if *debug {
Log.Printf("getKey: domain: %s, resource type: %d\n", domain, rtype)
}
if n, ok := dns.IsDomainName(domain); ok {
labels := dns.SplitDomainName(domain)
// Reverse domain, starting from top-level domain
// eg. ".com.mkaczanowski.test "
var tmp string
for i := 0; i < int(math.Floor(float64(n/2))); i++ {
tmp = labels[i]
labels[i] = labels[n-1]
labels[n-1] = tmp
}
reverseDomain := strings.Join(labels, ".")
r = strings.Join([]string{reverseDomain, strconv.Itoa(int(rtype))}, "_")
} else {
e = errors.New("Invailid domain: " + domain)
Log.Println(e.Error())
}
return r, e
}
// return formated key (domain_type)
func formatKey(domain string, rtype uint16) (key string, err error) {
domain = strings.ToLower(domain)
if _, ok := dns.IsDomainName(domain); !ok {
return "", errors.New(domain + " is not a valid domain")
}
key = domain + "_" + strconv.Itoa(int(rtype))
return
}
func updateRecord(r dns.RR, q *dns.Question) {
if *debug {
Log.Printf("updateRecord: resource record: %+v, question: %+v\n", r, q)
}
var (
rr dns.RR
name string
rtype uint16
ttl uint32
ip net.IP
)
header := r.Header()
name = header.Name
rtype = header.Rrtype
ttl = header.Ttl
if _, ok := dns.IsDomainName(name); ok {
if header.Class == dns.ClassANY && header.Rdlength == 0 { // Delete record
deleteRecord(name, rtype)
} else { // Add record
rheader := dns.RR_Header{
Name: name,
Rrtype: rtype,
Class: dns.ClassINET,
Ttl: ttl,
}
if a, ok := r.(*dns.A); ok {
rrr, err := getRecord(name, rtype)
if err == nil {
rr = rrr.(*dns.A)
} else {
rr = new(dns.A)
}
ip = a.A
rr.(*dns.A).Hdr = rheader
rr.(*dns.A).A = ip
} else if a, ok := r.(*dns.AAAA); ok {
rrr, err := getRecord(name, rtype)
if err == nil {
rr = rrr.(*dns.AAAA)
} else {
rr = new(dns.AAAA)
}
ip = a.AAAA
rr.(*dns.AAAA).Hdr = rheader
rr.(*dns.AAAA).AAAA = ip
}
storeRecord(rr)
}
}
}
func (DT *DomainRRTree) GetDomainNodeFromCacheWithName(d string) (*DomainNode, *MyError.MyError) {
if _, ok := dns.IsDomainName(d); ok {
dn := &Domain{
DomainName: dns.Fqdn(d),
}
return DT.GetDomainNodeFromCache(dn)
}
return nil, MyError.NewError(MyError.ERROR_PARAM, "Eorror param: "+reflect.ValueOf(d).String())
}
// Preparation for Query A and CNAME / NS record.
// param d : domain name to query
// isEdns0 : either use edns0_subnet or not
// return :
// *MyError.Myerror
// domain name server ip
// domain name server port
// *dns.OPT (for edns0_subnet)
func preQuery(d, srcIP string) (*dns.OPT, *MyError.MyError) {
if _, ok := dns.IsDomainName(d); !ok {
// return "", "", nil, MyError.NewError(MyError.ERROR_PARAM, d+" is not a domain name!")
}
var o *dns.OPT
if len(srcIP) > 0 {
o = PackEdns0SubnetOPT(srcIP, DEFAULT_SOURCEMASK, DEFAULT_SOURCESCOPE)
} else {
o = nil
}
return o, nil
}
func NewDomainNode(d string, soakey string, t uint32) (*DomainNode, *MyError.MyError) {
if _, ok := dns.IsDomainName(d); !ok {
return nil, MyError.NewError(MyError.ERROR_PARAM, d+" is not valid domain name")
}
return &DomainNode{
Domain: Domain{
DomainName: dns.Fqdn(d),
SOAKey: soakey,
TTL: t,
},
DomainRegionTree: NewDomainRegionTree(),
}, nil
}
func HttpDispacherQueryServe(w http.ResponseWriter, r *http.Request) {
url_path := r.URL.Path
query_domain := r.URL.Query().Get("d")
srcIP := r.URL.Query().Get("ip")
if _, ok := dns.IsDomainName(query_domain); !ok {
fmt.Fprintln(w, "Error domain name: ", query_domain)
utils.ServerLogger.Info("error domain name : %s ", query_domain)
return
}
if srcIP == "" {
hp := strings.Split(r.RemoteAddr, ":")
srcIP = hp[0]
}
utils.QueryLogger.Info("src ip: %s query_domain: %s url_path: %s", string(srcIP), query_domain, url_path)
if x := net.ParseIP(srcIP); x == nil {
w.WriteHeader(http.StatusForbidden)
fmt.Fprint(w, srcIP)
fmt.Fprintln(w, "src ip : "+srcIP+" is not correct")
utils.ServerLogger.Warning("src ip : %s is not correct", srcIP)
return
}
if config.InWhiteList(query_domain) {
ok, re, e := query.GetARecord(query_domain, srcIP)
if ok {
w.Header().Set("Content-Type", "text/plain")
w.WriteHeader(http.StatusOK)
for _, ree := range re {
if a, ok := ree.(*dns.A); ok {
fmt.Fprintln(w, a.A.String())
utils.ServerLogger.Debug("query result: %s ", a.A.String())
} else {
fmt.Fprintln(w, ree.String())
utils.ServerLogger.Debug("query result: %s ", ree.String())
}
}
} else if e != nil {
fmt.Fprintln(w, e.Error())
utils.ServerLogger.Error("query domain: %s src_ip: %s %s", query_domain, srcIP, e.Error())
} else {
fmt.Fprintln(w, "unkown error!\n")
utils.ServerLogger.Error("query domain: %s src_ip: %s fail unkown error!", query_domain, srcIP)
}
} else {
w.WriteHeader(http.StatusForbidden)
fmt.Fprintln(w, "Query for domain: "+query_domain+" is not permited\n")
utils.ServerLogger.Info("Query for domain: %s is not permited", query_domain)
return
}
}
func NewDNSTransportUpstreamCodec(domain string) (*DNSTransportUpstreamCodec, error) {
ret := DNSTransportUpstreamCodec{domain: domain + "."}
var ok bool
if ret.domain_label_count, ok = dns.IsDomainName(ret.domain); !ok {
return nil, fmt.Errorf("Bad domain %d", domain)
}
name_len := 255 - len(ret.domain)
name_len -= 9 // seq number (4 byte --base32--> 8byte) + '.'
ret.max_len_per_name = name_len / 64 * DNS_UPSTREAM_MAX_LEN_PER_LABEL
if tmp := name_len % 64; tmp > 9 {
ret.max_len_per_name += (tmp - 1) / 8 * 5
}
ret.header_codec = bitcodec.NewBitcodec(&DNSCodecHeader{})
return &ret, nil
}
// Handler for DNS queries
func query(w http.ResponseWriter, r *http.Request) {
server := r.URL.Query().Get(":server")
domain := dns.Fqdn(r.URL.Query().Get(":domain"))
querytype := r.URL.Query().Get(":querytype")
if domain, err := idna.ToASCII(domain); err == nil { // Valid domain name (ASCII or IDN)
if _, isDomain := dns.IsDomainName(domain); isDomain { // Well-formed domain name
if querytype, ok := dns.StringToType[strings.ToUpper(querytype)]; ok { // Valid DNS query type
resolve(w, r, server, domain, querytype)
} else {
error(w, 400, 404, "Invalid DNS query type")
}
} else {
error(w, 400, 402, "Input string is not a well-formed domain name")
}
} else {
error(w, 400, 401, "Input string could not be parsed")
}
}
func (DT *DomainRRTree) UpdateDomainNode(d *DomainNode) (bool, *MyError.MyError) {
if _, ok := dns.IsDomainName(d.DomainName); ok {
if dt, err := DT.GetDomainNodeFromCache(&d.Domain); dt != nil && err == nil {
d.DomainRegionTree = dt.DomainRegionTree
DT.RWMutex.Lock()
r := DT.LLRB.ReplaceOrInsert(d)
DT.RWMutex.Unlock()
if r != nil {
return true, nil
} else {
//Exception:see source code of "LLRB.ReplaceOrInsert"
return true, MyError.NewError(MyError.ERROR_UNKNOWN, "Update error, but inserted")
}
} else {
return false, MyError.NewError(MyError.ERROR_NOTFOUND, "DomainRRTree does not has "+reflect.ValueOf(d).String()+" or it has "+reflect.ValueOf(dt).String())
}
} else {
return false, MyError.NewError(MyError.ERROR_PARAM, " Param d "+reflect.ValueOf(d).String()+" is not valid Domain instance")
}
return false, MyError.NewError(MyError.ERROR_UNKNOWN, "UpdateDomainNode return unknown error")
}
func (dom Domain) addHandler(tld string) {
fqdn := dom.Name
if tld != "" {
fqdn = dom.Name + "." + tld
}
FqdnParts, _ := dns.IsDomainName(fqdn)
fmt.Printf("Adding: %v - %v nums\n", fqdn, FqdnParts)
// Handle dns requests if it is really a fqdn
if dns.IsFqdn(fqdn) {
dns.HandleFunc(fqdn, func(w dns.ResponseWriter, req *dns.Msg) {
m := new(dns.Msg)
m.SetReply(req)
m.Compress = true
for i, q := range req.Question {
fmt.Printf("Requested: %s, Type: %v\n", req.Question[i].Name, req.Question[i].Qtype)
switch q.Qtype {
case 1:
fmt.Printf("Adding a record %v with ip %v", q.Name, dom.A.Ip)
m.Answer = append(m.Answer, NewA(q.Name, dom.A.Ip, uint32(dom.A.Ttl)))
case 15:
fmt.Printf("Adding a record %v with ip %v", q.Name, dom.A.Ip)
m.Answer = append(m.Answer, NewMX(q.Name, dom.Mx.Content, dom.Mx.Priority, uint32(dom.Mx.Ttl)))
}
}
w.WriteMsg(m)
})
}
// add subdomains..
for _, d := range dom.Domains {
d.addHandler(fqdn)
}
}
func dnsLookup(msg commands.Message, ret commands.MessageFunc) string {
var lookupType, lookupAddr string
if len(msg.Params) < 2 {
return "Usage: .dns [A/AAAA/CNAME/PTR/TXT/SRV] [host]"
} else if len(msg.Params) == 2 {
lookupType = "A"
lookupAddr = msg.Params[1]
} else {
lookupType = msg.Params[1]
lookupAddr = msg.Params[2]
}
if strings.ToUpper(lookupType) == "PTR" {
if addr, err := dns.ReverseAddr(lookupAddr); err == nil {
return lookupHelper(msg, ret, dns.TypePTR, addr)
}
return "Invalid PTR address"
} else if _, isdomain := dns.IsDomainName(lookupAddr); isdomain {
if querytype, ok := dns.StringToType[strings.ToUpper(lookupType)]; ok {
return lookupHelper(msg, ret, querytype, lookupAddr)
}
}
return ""
}
func validateStaticEntryFile(sef string) (StaticEntryConfig, error) {
if len(sef) == 0 {
return StaticEntryConfig{}, nil
}
if _, err := os.Stat(sef); os.IsNotExist(err) {
return StaticEntryConfig{}, fmt.Errorf("StaticEntryFile not found: %s", sef)
}
conf, err := ParseStaticConfig(sef)
for _, entry := range conf.Entries {
switch entry.Type {
case "A":
ip := net.ParseIP(entry.Value)
if ip == nil {
return conf, fmt.Errorf("Invalid IP on StaticEntry: %q", entry.Value)
}
if !dns.IsFqdn(entry.Fqdn) {
return conf, fmt.Errorf("Invalid FQDN: %s", entry.Fqdn)
}
break
case "SRV":
if _, ok := dns.IsDomainName(entry.Fqdn); !ok {
return conf, fmt.Errorf("Invalid SRV FQDN: %s", entry.Fqdn)
}
if match, _ := regexp.MatchString(ValidHostPortRegex, entry.Value); !match {
return conf, fmt.Errorf("Invalid (Host:Port) tuple: %s", entry.Value)
}
break
default:
return conf, fmt.Errorf("Unsupported Record Type: %s", entry.Type)
}
}
return conf, err
}
rr = &dns.TXT{header, []string{node.Value}}
return
},
dns.TypeCNAME: func(node *etcd.Node, header dns.RR_Header) (rr dns.RR, err error) {
rr = &dns.CNAME{header, dns.Fqdn(node.Value)}
return
},
dns.TypeNS: func(node *etcd.Node, header dns.RR_Header) (rr dns.RR, err error) {
rr = &dns.NS{header, dns.Fqdn(node.Value)}
return
},
dns.TypePTR: func(node *etcd.Node, header dns.RR_Header) (rr dns.RR, err error) {
labels, ok := dns.IsDomainName(node.Value)
if ok && labels > 0 {
rr = &dns.PTR{header, dns.Fqdn(node.Value)}
} else {
err = &NodeConversionError{
Node: node,
Message: fmt.Sprintf("Value '%s' isn't a valid domain name", node.Value),
AttemptedType: dns.TypePTR}
}
return
},
dns.TypeSRV: func(node *etcd.Node, header dns.RR_Header) (rr dns.RR, err error) {
parts := strings.SplitN(node.Value, "\t", 4)
func QuerySOA(d string) (*dns.SOA, []*dns.NS, *MyError.MyError) {
//fmt.Println(utils.GetDebugLine(), " QuerySOA: ", d)
utils.ServerLogger.Debug(" QuerySOA domain: %s ", d)
if _, ok := dns.IsDomainName(d); !ok {
return nil, nil, MyError.NewError(MyError.ERROR_PARAM, d+" is not a domain name")
}
cf, el := dns.ClientConfigFromFile("/etc/resolv.conf")
if el != nil {
return nil, nil, MyError.NewError(MyError.ERROR_UNKNOWN, "Get dns config from file /etc/resolv.conf failed")
}
var soa *dns.SOA
var ns_a []*dns.NS
for c := 0; (soa == nil) && (c < 3); c++ {
soa, ns_a = nil, nil
r, e := DoQuery(d, cf.Servers, cf.Port, dns.TypeSOA, nil, UDP)
// fmt.Println(r)
if e != nil {
utils.QueryLogger.Error("QeurySOA got error : "+e.Error()+
". Param: %s , %v, %s, %v ", d, cf.Servers, cf.Port, dns.TypeSOA)
continue
} else {
var rr []dns.RR
if r.Answer != nil {
rr = append(rr, r.Answer...)
}
if r.Ns != nil {
rr = append(rr, r.Ns...)
}
soa, ns_a, e = ParseSOA(d, rr)
if e != nil {
switch e.ErrorNo {
case MyError.ERROR_SUBDOMAIN, MyError.ERROR_NOTVALID:
utils.ServerLogger.Error("ERROR_NOTVALID: %s", e.Error())
var ee *MyError.MyError
d, ee = GenerateParentDomain(d)
if ee != nil {
if ee.ErrorNo == MyError.ERROR_NORESULT {
// fmt.Println(ee)
// continue
}
return nil, nil, MyError.NewError(MyError.ERROR_NORESULT,
d+" has no SOA record "+" because of "+ee.Error())
}
continue
case MyError.ERROR_NORESULT:
// c++
//fmt.Println(utils.GetDebugLine(), e)
utils.ServerLogger.Error("ERROR_NORESULT: %s", e.Error())
//fmt.Println("+++++++++++++++++++++++++++++++++++")
continue
default:
// c++
utils.ServerLogger.Error("ERROR_DEFAULT: %s", e.Error())
//fmt.Println(utils.GetDebugLine(), ".....................")
//fmt.Println(utils.GetDebugLine(), e)
continue
// return nil, nil, e
}
} else {
if cap(ns_a) < 1 {
//fmt.Println(utils.GetDebugLine(), "QuerySOA: line 223: cap(ns_a)<1, need QueryNS ", soa.Hdr.Name)
utils.ServerLogger.Debug("QuerySOA: cap(ns_a)<1, need QueryNS: %s", soa.Hdr.Name)
ns_a, e = QueryNS(soa.Hdr.Name)
if e != nil {
//TODO: do some log
}
}
// fmt.Println("============xxxxxx================")
//fmt.Println(utils.GetDebugLine(), "QuerySOA: soa record ", soa, " ns_a: ", ns_a)
utils.ServerLogger.Debug("QuerySOA: soa record %v ns_a: %v", soa, ns_a)
return soa, ns_a, nil
}
}
}
return nil, nil, MyError.NewError(MyError.ERROR_UNKNOWN, d+" QuerySOA faild with unknow error")
}
