GetBPFromDNSSeed gets BP info from the IPv6 domain
(BPDomain string)
| 46 | |
| 47 | // GetBPFromDNSSeed gets BP info from the IPv6 domain |
| 48 | func (isc *IPv6SeedClient) GetBPFromDNSSeed(BPDomain string) (BPNodes IDNodeMap, err error) { |
| 49 | // Public key |
| 50 | var pubKeyBuf []byte |
| 51 | var pubBuf, nonceBuf, addrBuf, nodeIDBuf []byte |
| 52 | var pubErr, nonceErr, addrErr, nodeIDErr error |
| 53 | wg := new(sync.WaitGroup) |
| 54 | wg.Add(4) |
| 55 | |
| 56 | f := func(host string) ([]net.IP, error) { |
| 57 | return net.LookupIP(host) |
| 58 | } |
| 59 | // Public key |
| 60 | go func() { |
| 61 | defer wg.Done() |
| 62 | pubBuf, pubErr = ipv6.FromDomain(PUBKEY+BPDomain, f) |
| 63 | }() |
| 64 | // Nonce |
| 65 | go func() { |
| 66 | defer wg.Done() |
| 67 | nonceBuf, nonceErr = ipv6.FromDomain(NONCE+BPDomain, f) |
| 68 | }() |
| 69 | // Addr |
| 70 | go func() { |
| 71 | defer wg.Done() |
| 72 | addrBuf, addrErr = ipv6.FromDomain(ADDR+BPDomain, f) |
| 73 | }() |
| 74 | // NodeID |
| 75 | go func() { |
| 76 | defer wg.Done() |
| 77 | nodeIDBuf, nodeIDErr = ipv6.FromDomain(ID+BPDomain, f) |
| 78 | }() |
| 79 | |
| 80 | wg.Wait() |
| 81 | |
| 82 | switch { |
| 83 | case pubErr != nil: |
| 84 | err = pubErr |
| 85 | return |
| 86 | case nonceErr != nil: |
| 87 | err = nonceErr |
| 88 | return |
| 89 | case addrErr != nil: |
| 90 | err = addrErr |
| 91 | return |
| 92 | case nodeIDErr != nil: |
| 93 | err = nodeIDErr |
| 94 | return |
| 95 | } |
| 96 | |
| 97 | // For bug that trim the public header before or equal cql 0.7.0 |
| 98 | if len(pubBuf) == asymmetric.PublicKeyBytesLen-1 { |
| 99 | pubKeyBuf = make([]byte, asymmetric.PublicKeyBytesLen) |
| 100 | pubKeyBuf[0] = asymmetric.PublicKeyFormatHeader |
| 101 | copy(pubKeyBuf[1:], pubBuf) |
| 102 | } else if len(pubBuf) == 48 { |
| 103 | pubKeyBuf, err = crypto.RemovePKCSPadding(pubBuf) |
| 104 | if err != nil { |
| 105 | return |