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@22:914b970356f0, 2017-07-03 (annotated)
- Committer:
- andrewboyson
- Date:
- Mon Jul 03 14:29:07 2017 +0000
- Revision:
- 22:914b970356f0
- Parent:
- 15:6ca6778168b1
- Child:
- 30:e34173b7585c
Corrected NTP client function
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 | 13:9cd54f7db57a | 23 | int DnsQueryProtocol = DNS_PROTOCOL_NONE; |
andrewboyson | 13:9cd54f7db57a | 24 | bool DnsQueryIsBusy = false; |
andrewboyson | 13:9cd54f7db57a | 25 | |
andrewboyson | 13:9cd54f7db57a | 26 | static uint32_t started = 0; |
andrewboyson | 13:9cd54f7db57a | 27 | static uint32_t elapsed = 0; |
andrewboyson | 13:9cd54f7db57a | 28 | static void reap() |
andrewboyson | 13:9cd54f7db57a | 29 | { |
andrewboyson | 13:9cd54f7db57a | 30 | if (!DnsQueryIsBusy) return; |
andrewboyson | 13:9cd54f7db57a | 31 | |
andrewboyson | 13:9cd54f7db57a | 32 | if (elapsed - started >= TIME_OUT_SENT) |
andrewboyson | 13:9cd54f7db57a | 33 | { |
andrewboyson | 13:9cd54f7db57a | 34 | char text[100]; |
andrewboyson | 13:9cd54f7db57a | 35 | LogTimeF("DNS reaped ongoing request for "); |
andrewboyson | 13:9cd54f7db57a | 36 | if (DnsQueryName[0]) LogF("name %s", DnsQueryName); |
andrewboyson | 13:9cd54f7db57a | 37 | if (DnsQueryIp4) |
andrewboyson | 13:9cd54f7db57a | 38 | { |
andrewboyson | 14:e75a59c1123d | 39 | Ip4AddressToString(DnsQueryIp4, sizeof(text), text); |
andrewboyson | 13:9cd54f7db57a | 40 | LogF("ip4 %s", text); |
andrewboyson | 13:9cd54f7db57a | 41 | } |
andrewboyson | 13:9cd54f7db57a | 42 | if (DnsQueryIp6[0]) |
andrewboyson | 13:9cd54f7db57a | 43 | { |
andrewboyson | 14:e75a59c1123d | 44 | Ip6AddressToString(DnsQueryIp6, sizeof(text), text); |
andrewboyson | 13:9cd54f7db57a | 45 | LogF("ip6 %s", text); |
andrewboyson | 13:9cd54f7db57a | 46 | } |
andrewboyson | 13:9cd54f7db57a | 47 | LogF("\r\n"); |
andrewboyson | 13:9cd54f7db57a | 48 | |
andrewboyson | 13:9cd54f7db57a | 49 | DnsQueryName[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 50 | DnsQueryIp4 = 0; |
andrewboyson | 13:9cd54f7db57a | 51 | DnsQueryIp6[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 52 | DnsQueryIsBusy = false; |
andrewboyson | 13:9cd54f7db57a | 53 | started = 0; |
andrewboyson | 13:9cd54f7db57a | 54 | DnsQueryProtocol = DNS_PROTOCOL_NONE; |
andrewboyson | 13:9cd54f7db57a | 55 | } |
andrewboyson | 13:9cd54f7db57a | 56 | } |
andrewboyson | 13:9cd54f7db57a | 57 | void DnsQueryTick() |
andrewboyson | 13:9cd54f7db57a | 58 | { |
andrewboyson | 13:9cd54f7db57a | 59 | elapsed++; |
andrewboyson | 13:9cd54f7db57a | 60 | reap(); |
andrewboyson | 13:9cd54f7db57a | 61 | } |
andrewboyson | 13:9cd54f7db57a | 62 | void DnsQueryIp4FromName(char * name, int protocol) |
andrewboyson | 13:9cd54f7db57a | 63 | { |
andrewboyson | 13:9cd54f7db57a | 64 | strcpy(DnsQueryName, name); |
andrewboyson | 13:9cd54f7db57a | 65 | DnsQueryIp4 = 0; |
andrewboyson | 13:9cd54f7db57a | 66 | DnsQueryIp6[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 67 | DnsQueryIsBusy = true; |
andrewboyson | 13:9cd54f7db57a | 68 | started = elapsed; |
andrewboyson | 13:9cd54f7db57a | 69 | DnsQueryProtocol = protocol; |
andrewboyson | 13:9cd54f7db57a | 70 | } |
andrewboyson | 13:9cd54f7db57a | 71 | void DnsQueryIp6FromName(char * name, int protocol) |
andrewboyson | 13:9cd54f7db57a | 72 | { |
andrewboyson | 13:9cd54f7db57a | 73 | strcpy(DnsQueryName, name); |
andrewboyson | 13:9cd54f7db57a | 74 | DnsQueryIp4 = 0; |
andrewboyson | 13:9cd54f7db57a | 75 | DnsQueryIp6[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 76 | DnsQueryIsBusy = true; |
andrewboyson | 13:9cd54f7db57a | 77 | started = elapsed; |
andrewboyson | 13:9cd54f7db57a | 78 | DnsQueryProtocol = protocol; |
andrewboyson | 13:9cd54f7db57a | 79 | } |
andrewboyson | 13:9cd54f7db57a | 80 | void DnsQueryNameFromIp4(uint32_t ip, int protocol) |
andrewboyson | 13:9cd54f7db57a | 81 | { |
andrewboyson | 13:9cd54f7db57a | 82 | DnsQueryName[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 83 | DnsQueryIp4 = ip; |
andrewboyson | 13:9cd54f7db57a | 84 | DnsQueryIp6[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 85 | DnsQueryIsBusy = true; |
andrewboyson | 13:9cd54f7db57a | 86 | started = elapsed; |
andrewboyson | 13:9cd54f7db57a | 87 | DnsQueryProtocol = protocol; |
andrewboyson | 13:9cd54f7db57a | 88 | } |
andrewboyson | 13:9cd54f7db57a | 89 | void DnsQueryNameFromIp6(char* ip, int protocol) |
andrewboyson | 13:9cd54f7db57a | 90 | { |
andrewboyson | 13:9cd54f7db57a | 91 | DnsQueryName[0] = 0; |
andrewboyson | 13:9cd54f7db57a | 92 | DnsQueryIp4 = 0; |
andrewboyson | 13:9cd54f7db57a | 93 | memcpy(DnsQueryIp6, ip, 16); |
andrewboyson | 13:9cd54f7db57a | 94 | DnsQueryIsBusy = true; |
andrewboyson | 13:9cd54f7db57a | 95 | started = elapsed; |
andrewboyson | 13:9cd54f7db57a | 96 | DnsQueryProtocol = protocol; |
andrewboyson | 13:9cd54f7db57a | 97 | } |
andrewboyson | 13:9cd54f7db57a | 98 | int DnsQueryPoll(int* pSize) |
andrewboyson | 13:9cd54f7db57a | 99 | { |
andrewboyson | 13:9cd54f7db57a | 100 | if (!DnsQueryIsBusy) return DO_NOTHING; |
andrewboyson | 13:9cd54f7db57a | 101 | if (DnsQueryProtocol == DNS_PROTOCOL_UDNS && DhcpLocalIp == 0) return DO_NOTHING; |
andrewboyson | 13:9cd54f7db57a | 102 | |
andrewboyson | 13:9cd54f7db57a | 103 | static uint16_t id = 0; |
andrewboyson | 13:9cd54f7db57a | 104 | DnsHdrId = ++id; |
andrewboyson | 13:9cd54f7db57a | 105 | DnsHdrIsReply = false; |
andrewboyson | 13:9cd54f7db57a | 106 | DnsHdrIsRecursiveQuery = false; |
andrewboyson | 13:9cd54f7db57a | 107 | |
andrewboyson | 13:9cd54f7db57a | 108 | DnsHdrQdcount = 1; |
andrewboyson | 13:9cd54f7db57a | 109 | DnsHdrAncount = 0; |
andrewboyson | 13:9cd54f7db57a | 110 | DnsHdrNscount = 0; |
andrewboyson | 13:9cd54f7db57a | 111 | DnsHdrArcount = 0; |
andrewboyson | 13:9cd54f7db57a | 112 | |
andrewboyson | 13:9cd54f7db57a | 113 | DnsHdrWrite(); |
andrewboyson | 13:9cd54f7db57a | 114 | char* p = DnsHdrData; |
andrewboyson | 13:9cd54f7db57a | 115 | |
andrewboyson | 13:9cd54f7db57a | 116 | if (DnsQueryIp4) //Reverse |
andrewboyson | 13:9cd54f7db57a | 117 | { |
andrewboyson | 13:9cd54f7db57a | 118 | if (DEBUG) |
andrewboyson | 13:9cd54f7db57a | 119 | { |
andrewboyson | 13:9cd54f7db57a | 120 | char text[20]; |
andrewboyson | 15:6ca6778168b1 | 121 | DnsProtocolToString(DnsQueryProtocol, sizeof(text), text); |
andrewboyson | 15:6ca6778168b1 | 122 | LogTimeF("%s sent request for ", text); |
andrewboyson | 14:e75a59c1123d | 123 | Ip4AddressToString(DnsQueryIp4, sizeof(text), text); |
andrewboyson | 15:6ca6778168b1 | 124 | LogF("%s\r\n", text); |
andrewboyson | 13:9cd54f7db57a | 125 | } |
andrewboyson | 13:9cd54f7db57a | 126 | DnsNameEncodeIp4(DnsQueryIp4, &p); |
andrewboyson | 13:9cd54f7db57a | 127 | *p++ = 0; |
andrewboyson | 13:9cd54f7db57a | 128 | *p++ = DNS_RECORD_PTR; |
andrewboyson | 13:9cd54f7db57a | 129 | } |
andrewboyson | 13:9cd54f7db57a | 130 | else if (DnsQueryIp6[0]) |
andrewboyson | 13:9cd54f7db57a | 131 | { |
andrewboyson | 13:9cd54f7db57a | 132 | if (DEBUG) |
andrewboyson | 13:9cd54f7db57a | 133 | { |
andrewboyson | 13:9cd54f7db57a | 134 | char text[60]; |
andrewboyson | 15:6ca6778168b1 | 135 | DnsProtocolToString(DnsQueryProtocol, sizeof(text), text); |
andrewboyson | 15:6ca6778168b1 | 136 | LogTimeF("%s sent request for ", text); |
andrewboyson | 14:e75a59c1123d | 137 | Ip6AddressToString(DnsQueryIp6, sizeof(text), text); |
andrewboyson | 15:6ca6778168b1 | 138 | LogF("%s\r\n", text); |
andrewboyson | 13:9cd54f7db57a | 139 | } |
andrewboyson | 13:9cd54f7db57a | 140 | DnsNameEncodeIp6(DnsQueryIp6, &p); |
andrewboyson | 13:9cd54f7db57a | 141 | *p++ = 0; |
andrewboyson | 13:9cd54f7db57a | 142 | *p++ = DNS_RECORD_PTR; |
andrewboyson | 13:9cd54f7db57a | 143 | } |
andrewboyson | 13:9cd54f7db57a | 144 | else //Forward |
andrewboyson | 13:9cd54f7db57a | 145 | { |
andrewboyson | 13:9cd54f7db57a | 146 | DnsNameEncode(DnsQueryName, &p); |
andrewboyson | 13:9cd54f7db57a | 147 | *p++ = 0; |
andrewboyson | 13:9cd54f7db57a | 148 | *p++ = DNS_RECORD_A; |
andrewboyson | 13:9cd54f7db57a | 149 | } |
andrewboyson | 13:9cd54f7db57a | 150 | *p++ = DnsQueryProtocol == DNS_PROTOCOL_MDNS && MDNS_UNICAST ? 0x80 : 0; //Set the 15th bit (UNICAST_RESPONSE) to 1 if MDNS |
andrewboyson | 13:9cd54f7db57a | 151 | *p++ = 1; //QCLASS_IN = 1 - internet |
andrewboyson | 13:9cd54f7db57a | 152 | |
andrewboyson | 13:9cd54f7db57a | 153 | *pSize = p - DnsHdrPacket; |
andrewboyson | 13:9cd54f7db57a | 154 | |
andrewboyson | 13:9cd54f7db57a | 155 | DnsQueryIsBusy = false; |
andrewboyson | 13:9cd54f7db57a | 156 | |
andrewboyson | 13:9cd54f7db57a | 157 | switch (DnsQueryProtocol) |
andrewboyson | 13:9cd54f7db57a | 158 | { |
andrewboyson | 13:9cd54f7db57a | 159 | case DNS_PROTOCOL_UDNS: return UNICAST_DNS; //IPv6 ==> NdpDnsServer; IPv4 ==> DhcpDnsServer |
andrewboyson | 13:9cd54f7db57a | 160 | case DNS_PROTOCOL_MDNS: return MULTICAST_MDNS; |
andrewboyson | 13:9cd54f7db57a | 161 | case DNS_PROTOCOL_LLMNR: return MULTICAST_LLMNR; |
andrewboyson | 13:9cd54f7db57a | 162 | default: |
andrewboyson | 13:9cd54f7db57a | 163 | LogTimeF("DNS unknown query protocol %d\r\n", DnsQueryProtocol); |
andrewboyson | 13:9cd54f7db57a | 164 | return DO_NOTHING; |
andrewboyson | 13:9cd54f7db57a | 165 | } |
andrewboyson | 13:9cd54f7db57a | 166 | } |