A stack which works with or without an Mbed os library. Provides IPv4 or IPv6 with a full 1500 byte buffer.
Dependents: oldheating gps motorhome heating
udp/dns/dnsquery.cpp@33:714a0345e59b, 2017-08-23 (annotated)
- Committer:
- andrewboyson
- Date:
- Wed Aug 23 18:02:42 2017 +0000
- Revision:
- 33:714a0345e59b
- Parent:
- 32:679654f2d023
- Child:
- 35:93c39d260a83
Made DNS names case insensitive
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
andrewboyson | 13:9cd54f7db57a | 1 | #include "mbed.h" |
andrewboyson | 13:9cd54f7db57a | 2 | #include "log.h" |
andrewboyson | 13:9cd54f7db57a | 3 | #include "net.h" |
andrewboyson | 14:e75a59c1123d | 4 | #include "ip4.h" |
andrewboyson | 14:e75a59c1123d | 5 | #include "ip6.h" |
andrewboyson | 13:9cd54f7db57a | 6 | #include "dhcp.h" |
andrewboyson | 13:9cd54f7db57a | 7 | #include "dns.h" |
andrewboyson | 13:9cd54f7db57a | 8 | #include "udp.h" |
andrewboyson | 13:9cd54f7db57a | 9 | #include "slaac.h" |
andrewboyson | 13:9cd54f7db57a | 10 | #include "dnshdr.h" |
andrewboyson | 13:9cd54f7db57a | 11 | #include "dnsname.h" |
andrewboyson | 13:9cd54f7db57a | 12 | |
andrewboyson | 22:914b970356f0 | 13 | #define DEBUG false |
andrewboyson | 13:9cd54f7db57a | 14 | |
andrewboyson | 13:9cd54f7db57a | 15 | #define TIME_OUT_SENT 3 |
andrewboyson | 13:9cd54f7db57a | 16 | |
andrewboyson | 13:9cd54f7db57a | 17 | #define MDNS_UNICAST false |
andrewboyson | 13:9cd54f7db57a | 18 | |
andrewboyson | 13:9cd54f7db57a | 19 | char DnsQueryName[63]; |
andrewboyson | 13:9cd54f7db57a | 20 | uint32_t DnsQueryIp4 = 0; |
andrewboyson | 13:9cd54f7db57a | 21 | char DnsQueryIp6[16]; |
andrewboyson | 13:9cd54f7db57a | 22 | |
andrewboyson | 30:e34173b7585c | 23 | char DnsQueryRecordType = DNS_RECORD_NONE; |
andrewboyson | 30:e34173b7585c | 24 | int DnsQueryProtocol = DNS_PROTOCOL_NONE; |
andrewboyson | 30:e34173b7585c | 25 | bool DnsQueryIsBusy = false; |
andrewboyson | 13:9cd54f7db57a | 26 | |
andrewboyson | 13:9cd54f7db57a | 27 | static uint32_t started = 0; |
andrewboyson | 13:9cd54f7db57a | 28 | static uint32_t elapsed = 0; |
andrewboyson | 13:9cd54f7db57a | 29 | static void reap() |
andrewboyson | 13:9cd54f7db57a | 30 | { |
andrewboyson | 13:9cd54f7db57a | 31 | if (!DnsQueryIsBusy) return; |
andrewboyson | 13:9cd54f7db57a | 32 | |
andrewboyson | 13:9cd54f7db57a | 33 | if (elapsed - started >= TIME_OUT_SENT) |
andrewboyson | 13:9cd54f7db57a | 34 | { |
andrewboyson | 13:9cd54f7db57a | 35 | char text[100]; |
andrewboyson | 13:9cd54f7db57a | 36 | LogTimeF("DNS reaped ongoing request for "); |
andrewboyson | 13:9cd54f7db57a | 37 | if (DnsQueryName[0]) LogF("name %s", DnsQueryName); |
andrewboyson | 13:9cd54f7db57a | 38 | if (DnsQueryIp4) |
andrewboyson | 13:9cd54f7db57a | 39 | { |
andrewboyson | 14:e75a59c1123d | 40 | Ip4AddressToString(DnsQueryIp4, sizeof(text), text); |
andrewboyson | 13:9cd54f7db57a | 41 | LogF("ip4 %s", text); |
andrewboyson | 13:9cd54f7db57a | 42 | } |
andrewboyson | 13:9cd54f7db57a | 43 | if (DnsQueryIp6[0]) |
andrewboyson | 13:9cd54f7db57a | 44 | { |
andrewboyson | 14:e75a59c1123d | 45 | Ip6AddressToString(DnsQueryIp6, sizeof(text), text); |
andrewboyson | 13:9cd54f7db57a | 46 | LogF("ip6 %s", text); |
andrewboyson | 13:9cd54f7db57a | 47 | } |
andrewboyson | 13:9cd54f7db57a | 48 | LogF("\r\n"); |
andrewboyson | 13:9cd54f7db57a | 49 | |
andrewboyson | 13:9cd54f7db57a | 50 | DnsQueryName[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 51 | DnsQueryIp4 = 0; |
andrewboyson | 13:9cd54f7db57a | 52 | DnsQueryIp6[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 53 | DnsQueryIsBusy = false; |
andrewboyson | 13:9cd54f7db57a | 54 | started = 0; |
andrewboyson | 13:9cd54f7db57a | 55 | DnsQueryProtocol = DNS_PROTOCOL_NONE; |
andrewboyson | 30:e34173b7585c | 56 | DnsQueryRecordType = DNS_RECORD_NONE; |
andrewboyson | 13:9cd54f7db57a | 57 | } |
andrewboyson | 13:9cd54f7db57a | 58 | } |
andrewboyson | 13:9cd54f7db57a | 59 | void DnsQueryTick() |
andrewboyson | 13:9cd54f7db57a | 60 | { |
andrewboyson | 13:9cd54f7db57a | 61 | elapsed++; |
andrewboyson | 13:9cd54f7db57a | 62 | reap(); |
andrewboyson | 13:9cd54f7db57a | 63 | } |
andrewboyson | 13:9cd54f7db57a | 64 | void DnsQueryIp4FromName(char * name, int protocol) |
andrewboyson | 13:9cd54f7db57a | 65 | { |
andrewboyson | 32:679654f2d023 | 66 | DnsMakeFullNameFromName(protocol, name, sizeof(DnsQueryName), DnsQueryName); |
andrewboyson | 13:9cd54f7db57a | 67 | DnsQueryIp4 = 0; |
andrewboyson | 13:9cd54f7db57a | 68 | DnsQueryIp6[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 69 | DnsQueryIsBusy = true; |
andrewboyson | 13:9cd54f7db57a | 70 | started = elapsed; |
andrewboyson | 13:9cd54f7db57a | 71 | DnsQueryProtocol = protocol; |
andrewboyson | 30:e34173b7585c | 72 | DnsQueryRecordType = DNS_RECORD_A; |
andrewboyson | 13:9cd54f7db57a | 73 | } |
andrewboyson | 13:9cd54f7db57a | 74 | void DnsQueryIp6FromName(char * name, int protocol) |
andrewboyson | 13:9cd54f7db57a | 75 | { |
andrewboyson | 32:679654f2d023 | 76 | DnsMakeFullNameFromName(protocol, name, sizeof(DnsQueryName), DnsQueryName); |
andrewboyson | 13:9cd54f7db57a | 77 | DnsQueryIp4 = 0; |
andrewboyson | 13:9cd54f7db57a | 78 | DnsQueryIp6[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 79 | DnsQueryIsBusy = true; |
andrewboyson | 13:9cd54f7db57a | 80 | started = elapsed; |
andrewboyson | 13:9cd54f7db57a | 81 | DnsQueryProtocol = protocol; |
andrewboyson | 30:e34173b7585c | 82 | DnsQueryRecordType = DNS_RECORD_AAAA; |
andrewboyson | 13:9cd54f7db57a | 83 | } |
andrewboyson | 13:9cd54f7db57a | 84 | void DnsQueryNameFromIp4(uint32_t ip, int protocol) |
andrewboyson | 13:9cd54f7db57a | 85 | { |
andrewboyson | 13:9cd54f7db57a | 86 | DnsQueryName[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 87 | DnsQueryIp4 = ip; |
andrewboyson | 13:9cd54f7db57a | 88 | DnsQueryIp6[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 89 | DnsQueryIsBusy = true; |
andrewboyson | 13:9cd54f7db57a | 90 | started = elapsed; |
andrewboyson | 13:9cd54f7db57a | 91 | DnsQueryProtocol = protocol; |
andrewboyson | 30:e34173b7585c | 92 | DnsQueryRecordType = DNS_RECORD_PTR; |
andrewboyson | 13:9cd54f7db57a | 93 | } |
andrewboyson | 13:9cd54f7db57a | 94 | void DnsQueryNameFromIp6(char* ip, int protocol) |
andrewboyson | 13:9cd54f7db57a | 95 | { |
andrewboyson | 13:9cd54f7db57a | 96 | DnsQueryName[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 97 | DnsQueryIp4 = 0; |
andrewboyson | 13:9cd54f7db57a | 98 | memcpy(DnsQueryIp6, ip, 16); |
andrewboyson | 13:9cd54f7db57a | 99 | DnsQueryIsBusy = true; |
andrewboyson | 13:9cd54f7db57a | 100 | started = elapsed; |
andrewboyson | 13:9cd54f7db57a | 101 | DnsQueryProtocol = protocol; |
andrewboyson | 30:e34173b7585c | 102 | DnsQueryRecordType = DNS_RECORD_PTR; |
andrewboyson | 30:e34173b7585c | 103 | } |
andrewboyson | 30:e34173b7585c | 104 | static void logQuery() |
andrewboyson | 30:e34173b7585c | 105 | { |
andrewboyson | 30:e34173b7585c | 106 | char text[60]; |
andrewboyson | 30:e34173b7585c | 107 | DnsProtocolToString(DnsQueryProtocol, sizeof(text), text); |
andrewboyson | 32:679654f2d023 | 108 | LogTimeF("DnsQuery sent %s request for ", text); |
andrewboyson | 30:e34173b7585c | 109 | DnsRecordTypeToString(DnsQueryRecordType, sizeof(text), text); |
andrewboyson | 30:e34173b7585c | 110 | LogF("%s ", text); |
andrewboyson | 30:e34173b7585c | 111 | if (DnsQueryIp4) //Reverse |
andrewboyson | 30:e34173b7585c | 112 | { |
andrewboyson | 30:e34173b7585c | 113 | Ip4AddressToString(DnsQueryIp4, sizeof(text), text); |
andrewboyson | 30:e34173b7585c | 114 | LogF("%s\r\n", text); |
andrewboyson | 30:e34173b7585c | 115 | } |
andrewboyson | 30:e34173b7585c | 116 | else if (DnsQueryIp6[0]) |
andrewboyson | 30:e34173b7585c | 117 | { |
andrewboyson | 30:e34173b7585c | 118 | Ip6AddressToString(DnsQueryIp6, sizeof(text), text); |
andrewboyson | 30:e34173b7585c | 119 | LogF("%s\r\n", text); |
andrewboyson | 30:e34173b7585c | 120 | } |
andrewboyson | 30:e34173b7585c | 121 | else //Forward |
andrewboyson | 30:e34173b7585c | 122 | { |
andrewboyson | 30:e34173b7585c | 123 | LogF("%s\r\n", DnsQueryName); |
andrewboyson | 30:e34173b7585c | 124 | } |
andrewboyson | 13:9cd54f7db57a | 125 | } |
andrewboyson | 13:9cd54f7db57a | 126 | int DnsQueryPoll(int* pSize) |
andrewboyson | 13:9cd54f7db57a | 127 | { |
andrewboyson | 13:9cd54f7db57a | 128 | if (!DnsQueryIsBusy) return DO_NOTHING; |
andrewboyson | 13:9cd54f7db57a | 129 | if (DnsQueryProtocol == DNS_PROTOCOL_UDNS && DhcpLocalIp == 0) return DO_NOTHING; |
andrewboyson | 13:9cd54f7db57a | 130 | |
andrewboyson | 32:679654f2d023 | 131 | if (DEBUG) logQuery(); |
andrewboyson | 30:e34173b7585c | 132 | |
andrewboyson | 13:9cd54f7db57a | 133 | static uint16_t id = 0; |
andrewboyson | 13:9cd54f7db57a | 134 | DnsHdrId = ++id; |
andrewboyson | 13:9cd54f7db57a | 135 | DnsHdrIsReply = false; |
andrewboyson | 13:9cd54f7db57a | 136 | DnsHdrIsRecursiveQuery = false; |
andrewboyson | 13:9cd54f7db57a | 137 | |
andrewboyson | 13:9cd54f7db57a | 138 | DnsHdrQdcount = 1; |
andrewboyson | 13:9cd54f7db57a | 139 | DnsHdrAncount = 0; |
andrewboyson | 13:9cd54f7db57a | 140 | DnsHdrNscount = 0; |
andrewboyson | 13:9cd54f7db57a | 141 | DnsHdrArcount = 0; |
andrewboyson | 13:9cd54f7db57a | 142 | |
andrewboyson | 13:9cd54f7db57a | 143 | DnsHdrWrite(); |
andrewboyson | 13:9cd54f7db57a | 144 | char* p = DnsHdrData; |
andrewboyson | 13:9cd54f7db57a | 145 | |
andrewboyson | 30:e34173b7585c | 146 | if (DnsQueryIp4 ) DnsNameEncodeIp4(DnsQueryIp4, &p); |
andrewboyson | 30:e34173b7585c | 147 | else if (DnsQueryIp6[0]) DnsNameEncodeIp6(DnsQueryIp6, &p); |
andrewboyson | 30:e34173b7585c | 148 | else DnsNameEncode (DnsQueryName, &p); |
andrewboyson | 30:e34173b7585c | 149 | |
andrewboyson | 30:e34173b7585c | 150 | *p++ = 0; |
andrewboyson | 30:e34173b7585c | 151 | *p++ = DnsQueryRecordType; |
andrewboyson | 13:9cd54f7db57a | 152 | *p++ = DnsQueryProtocol == DNS_PROTOCOL_MDNS && MDNS_UNICAST ? 0x80 : 0; //Set the 15th bit (UNICAST_RESPONSE) to 1 if MDNS |
andrewboyson | 13:9cd54f7db57a | 153 | *p++ = 1; //QCLASS_IN = 1 - internet |
andrewboyson | 13:9cd54f7db57a | 154 | |
andrewboyson | 13:9cd54f7db57a | 155 | *pSize = p - DnsHdrPacket; |
andrewboyson | 13:9cd54f7db57a | 156 | |
andrewboyson | 13:9cd54f7db57a | 157 | DnsQueryIsBusy = false; |
andrewboyson | 13:9cd54f7db57a | 158 | |
andrewboyson | 13:9cd54f7db57a | 159 | switch (DnsQueryProtocol) |
andrewboyson | 13:9cd54f7db57a | 160 | { |
andrewboyson | 13:9cd54f7db57a | 161 | case DNS_PROTOCOL_UDNS: return UNICAST_DNS; //IPv6 ==> NdpDnsServer; IPv4 ==> DhcpDnsServer |
andrewboyson | 13:9cd54f7db57a | 162 | case DNS_PROTOCOL_MDNS: return MULTICAST_MDNS; |
andrewboyson | 13:9cd54f7db57a | 163 | case DNS_PROTOCOL_LLMNR: return MULTICAST_LLMNR; |
andrewboyson | 13:9cd54f7db57a | 164 | default: |
andrewboyson | 13:9cd54f7db57a | 165 | LogTimeF("DNS unknown query protocol %d\r\n", DnsQueryProtocol); |
andrewboyson | 13:9cd54f7db57a | 166 | return DO_NOTHING; |
andrewboyson | 13:9cd54f7db57a | 167 | } |
andrewboyson | 13:9cd54f7db57a | 168 | } |