Andrew Boyson / net

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.c@133:a37eb35a03f1, 2019-03-20 (annotated)

Committer:
andrewboyson
Date:
Wed Mar 20 11:20:44 2019 +0000
Revision:
133:a37eb35a03f1
Parent:
132:db2174b36a6d
Child:
171:f708d6776752
Updated clock library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 61:aad055f1b0d1 1 #include <stdint.h>
andrewboyson 61:aad055f1b0d1 2 #include <stdbool.h>
andrewboyson 61:aad055f1b0d1 3
andrewboyson 13:9cd54f7db57a 4 #include "log.h"
andrewboyson 93:580fc113d9e9 5 #include "mstimer.h"
andrewboyson 13:9cd54f7db57a 6 #include "net.h"
andrewboyson 37:793b39683406 7 #include "action.h"
andrewboyson 49:1a6336f2b3f9 8 #include "ip4addr.h"
andrewboyson 49:1a6336f2b3f9 9 #include "ip6addr.h"
andrewboyson 13:9cd54f7db57a 10 #include "dhcp.h"
andrewboyson 13:9cd54f7db57a 11 #include "dns.h"
andrewboyson 13:9cd54f7db57a 12 #include "udp.h"
andrewboyson 13:9cd54f7db57a 13 #include "slaac.h"
andrewboyson 13:9cd54f7db57a 14 #include "dnshdr.h"
andrewboyson 13:9cd54f7db57a 15 #include "dnsname.h"
andrewboyson 128:79052cb4a41c 16 #include "dnslabel.h"
andrewboyson 13:9cd54f7db57a 17
andrewboyson 37:793b39683406 18 bool DnsQueryTrace = false;
andrewboyson 13:9cd54f7db57a 19
andrewboyson 93:580fc113d9e9 20 #define TIME_OUT_SENT_MS 3000
andrewboyson 13:9cd54f7db57a 21
andrewboyson 13:9cd54f7db57a 22 #define MDNS_UNICAST false
andrewboyson 13:9cd54f7db57a 23
andrewboyson 35:93c39d260a83 24 char DnsQueryName[DNS_MAX_LABEL_LENGTH+1];
andrewboyson 13:9cd54f7db57a 25 uint32_t DnsQueryIp4 = 0;
andrewboyson 13:9cd54f7db57a 26 char DnsQueryIp6[16];
andrewboyson 13:9cd54f7db57a 27
andrewboyson 30:e34173b7585c 28 char DnsQueryRecordType = DNS_RECORD_NONE;
andrewboyson 30:e34173b7585c 29 int DnsQueryProtocol = DNS_PROTOCOL_NONE;
andrewboyson 30:e34173b7585c 30 bool DnsQueryIsBusy = false;
andrewboyson 13:9cd54f7db57a 31
andrewboyson 93:580fc113d9e9 32 static uint32_t startedMs = 0;
andrewboyson 13:9cd54f7db57a 33 static void reap()
andrewboyson 13:9cd54f7db57a 34 {
andrewboyson 13:9cd54f7db57a 35 if (!DnsQueryIsBusy) return;
andrewboyson 13:9cd54f7db57a 36
andrewboyson 133:a37eb35a03f1 37 if (MsTimerRelative(startedMs, TIME_OUT_SENT_MS))
andrewboyson 13:9cd54f7db57a 38 {
andrewboyson 13:9cd54f7db57a 39 LogTimeF("DNS reaped ongoing request for ");
andrewboyson 13:9cd54f7db57a 40 if (DnsQueryName[0]) LogF("name %s", DnsQueryName);
andrewboyson 13:9cd54f7db57a 41 if (DnsQueryIp4)
andrewboyson 13:9cd54f7db57a 42 {
andrewboyson 47:73af5c0b0dc2 43 Log("ip4 "); Ip4AddressLog(DnsQueryIp4);
andrewboyson 13:9cd54f7db57a 44 }
andrewboyson 13:9cd54f7db57a 45 if (DnsQueryIp6[0])
andrewboyson 13:9cd54f7db57a 46 {
andrewboyson 47:73af5c0b0dc2 47 Log("ip6 "); Ip6AddressLog(DnsQueryIp6);
andrewboyson 13:9cd54f7db57a 48 }
andrewboyson 13:9cd54f7db57a 49 LogF("\r\n");
andrewboyson 13:9cd54f7db57a 50
andrewboyson 13:9cd54f7db57a 51 DnsQueryName[0] = 0;
andrewboyson 13:9cd54f7db57a 52 DnsQueryIp4 = 0;
andrewboyson 13:9cd54f7db57a 53 DnsQueryIp6[0] = 0;
andrewboyson 13:9cd54f7db57a 54 DnsQueryIsBusy = false;
andrewboyson 93:580fc113d9e9 55 startedMs = MsTimerCount;
andrewboyson 13:9cd54f7db57a 56 DnsQueryProtocol = DNS_PROTOCOL_NONE;
andrewboyson 30:e34173b7585c 57 DnsQueryRecordType = DNS_RECORD_NONE;
andrewboyson 13:9cd54f7db57a 58 }
andrewboyson 13:9cd54f7db57a 59 }
andrewboyson 43:bc028d5a6424 60 void DnsQueryMain()
andrewboyson 13:9cd54f7db57a 61 {
andrewboyson 93:580fc113d9e9 62 reap();
andrewboyson 13:9cd54f7db57a 63 }
andrewboyson 13:9cd54f7db57a 64 void DnsQueryIp4FromName(char * name, int protocol)
andrewboyson 13:9cd54f7db57a 65 {
andrewboyson 128:79052cb4a41c 66 DnsLabelMakeFullNameFromName(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 93:580fc113d9e9 70 startedMs = MsTimerCount;
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 128:79052cb4a41c 76 DnsLabelMakeFullNameFromName(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 93:580fc113d9e9 80 startedMs = MsTimerCount;
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 93:580fc113d9e9 90 startedMs = MsTimerCount;
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 49:1a6336f2b3f9 98 Ip6AddressCopy(DnsQueryIp6, ip);
andrewboyson 13:9cd54f7db57a 99 DnsQueryIsBusy = true;
andrewboyson 93:580fc113d9e9 100 startedMs = MsTimerCount;
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 43:bc028d5a6424 106 if (NetTraceNewLine) Log("\r\n");
andrewboyson 47:73af5c0b0dc2 107 LogTimeF("DnsQuery sent ");
andrewboyson 47:73af5c0b0dc2 108 DnsProtocolLog(DnsQueryProtocol);
andrewboyson 47:73af5c0b0dc2 109 Log(" request for ");
andrewboyson 47:73af5c0b0dc2 110 DnsRecordTypeLog(DnsQueryRecordType);
andrewboyson 47:73af5c0b0dc2 111 Log(" ");
andrewboyson 30:e34173b7585c 112 if (DnsQueryIp4) //Reverse
andrewboyson 30:e34173b7585c 113 {
andrewboyson 47:73af5c0b0dc2 114 Ip4AddressLog(DnsQueryIp4);
andrewboyson 30:e34173b7585c 115 }
andrewboyson 30:e34173b7585c 116 else if (DnsQueryIp6[0])
andrewboyson 30:e34173b7585c 117 {
andrewboyson 47:73af5c0b0dc2 118 Ip6AddressLog(DnsQueryIp6);
andrewboyson 30:e34173b7585c 119 }
andrewboyson 30:e34173b7585c 120 else //Forward
andrewboyson 30:e34173b7585c 121 {
andrewboyson 47:73af5c0b0dc2 122 Log(DnsQueryName);
andrewboyson 30:e34173b7585c 123 }
andrewboyson 47:73af5c0b0dc2 124 Log("\r\n");
andrewboyson 13:9cd54f7db57a 125 }
andrewboyson 59:e0e556c8bd46 126 int DnsQueryPoll(void* pPacket, int* pSize)
andrewboyson 13:9cd54f7db57a 127 {
andrewboyson 59:e0e556c8bd46 128 DnsHdrSetup(pPacket, *pSize);
andrewboyson 59:e0e556c8bd46 129
andrewboyson 13:9cd54f7db57a 130 if (!DnsQueryIsBusy) return DO_NOTHING;
andrewboyson 13:9cd54f7db57a 131 if (DnsQueryProtocol == DNS_PROTOCOL_UDNS && DhcpLocalIp == 0) return DO_NOTHING;
andrewboyson 13:9cd54f7db57a 132
andrewboyson 57:e0fb648acf48 133 NetTraceHostCheckIp6(DnsQueryIp6);
andrewboyson 57:e0fb648acf48 134
andrewboyson 57:e0fb648acf48 135 if (DnsQueryTrace || NetTraceHostGetMatched()) logQuery();
andrewboyson 30:e34173b7585c 136
andrewboyson 13:9cd54f7db57a 137 static uint16_t id = 0;
andrewboyson 13:9cd54f7db57a 138 DnsHdrId = ++id;
andrewboyson 13:9cd54f7db57a 139 DnsHdrIsReply = false;
andrewboyson 13:9cd54f7db57a 140 DnsHdrIsRecursiveQuery = false;
andrewboyson 13:9cd54f7db57a 141
andrewboyson 13:9cd54f7db57a 142 DnsHdrQdcount = 1;
andrewboyson 13:9cd54f7db57a 143 DnsHdrAncount = 0;
andrewboyson 13:9cd54f7db57a 144 DnsHdrNscount = 0;
andrewboyson 13:9cd54f7db57a 145 DnsHdrArcount = 0;
andrewboyson 13:9cd54f7db57a 146
andrewboyson 13:9cd54f7db57a 147 DnsHdrWrite();
andrewboyson 13:9cd54f7db57a 148 char* p = DnsHdrData;
andrewboyson 13:9cd54f7db57a 149
andrewboyson 30:e34173b7585c 150 if (DnsQueryIp4 ) DnsNameEncodeIp4(DnsQueryIp4, &p);
andrewboyson 30:e34173b7585c 151 else if (DnsQueryIp6[0]) DnsNameEncodeIp6(DnsQueryIp6, &p);
andrewboyson 37:793b39683406 152 else DnsNameEncodePtr(DnsQueryName, &p);
andrewboyson 30:e34173b7585c 153
andrewboyson 30:e34173b7585c 154 *p++ = 0;
andrewboyson 30:e34173b7585c 155 *p++ = DnsQueryRecordType;
andrewboyson 13:9cd54f7db57a 156 *p++ = DnsQueryProtocol == DNS_PROTOCOL_MDNS && MDNS_UNICAST ? 0x80 : 0; //Set the 15th bit (UNICAST_RESPONSE) to 1 if MDNS
andrewboyson 13:9cd54f7db57a 157 *p++ = 1; //QCLASS_IN = 1 - internet
andrewboyson 13:9cd54f7db57a 158
andrewboyson 13:9cd54f7db57a 159 *pSize = p - DnsHdrPacket;
andrewboyson 13:9cd54f7db57a 160
andrewboyson 13:9cd54f7db57a 161 DnsQueryIsBusy = false;
andrewboyson 38:cc8945857a0d 162
andrewboyson 57:e0fb648acf48 163 if (DnsQueryTrace || NetTraceHostGetMatched()) DnsHdrLog(DnsQueryProtocol);
andrewboyson 13:9cd54f7db57a 164
andrewboyson 37:793b39683406 165 int dest = DO_NOTHING;
andrewboyson 37:793b39683406 166
andrewboyson 13:9cd54f7db57a 167 switch (DnsQueryProtocol)
andrewboyson 13:9cd54f7db57a 168 {
andrewboyson 37:793b39683406 169 case DNS_PROTOCOL_UDNS: dest = UNICAST_DNS; break; //IPv6 ==> NdpDnsServer; IPv4 ==> DhcpDnsServer
andrewboyson 37:793b39683406 170 case DNS_PROTOCOL_MDNS: dest = MULTICAST_MDNS; break;
andrewboyson 37:793b39683406 171 case DNS_PROTOCOL_LLMNR: dest = MULTICAST_LLMNR; break;
andrewboyson 13:9cd54f7db57a 172 default:
andrewboyson 13:9cd54f7db57a 173 LogTimeF("DNS unknown query protocol %d\r\n", DnsQueryProtocol);
andrewboyson 13:9cd54f7db57a 174 return DO_NOTHING;
andrewboyson 13:9cd54f7db57a 175 }
andrewboyson 37:793b39683406 176
andrewboyson 57:e0fb648acf48 177 return ActionMakeFromDestAndTrace(dest, DnsQueryTrace || NetTraceHostGetMatched());
andrewboyson 13:9cd54f7db57a 178 }