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@187:122fc1996c86, 2021-01-18 (annotated)

Committer:
andrewboyson
Date:
Mon Jan 18 18:23:46 2021 +0000
Revision:
187:122fc1996c86
Parent:
176:7eb916c22084
Child:
193:47a953ab571b
Changed Ip4Address to Ip4Addr.; Moved Ip6AddrIsExternal from NdpNeedsToBeRouted.

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 172:9bc3c7b2cca1 13 #include "eth.h"
andrewboyson 13:9cd54f7db57a 14 #include "slaac.h"
andrewboyson 13:9cd54f7db57a 15 #include "dnshdr.h"
andrewboyson 13:9cd54f7db57a 16 #include "dnsname.h"
andrewboyson 128:79052cb4a41c 17 #include "dnslabel.h"
andrewboyson 13:9cd54f7db57a 18
andrewboyson 37:793b39683406 19 bool DnsQueryTrace = false;
andrewboyson 13:9cd54f7db57a 20
andrewboyson 93:580fc113d9e9 21 #define TIME_OUT_SENT_MS 3000
andrewboyson 13:9cd54f7db57a 22
andrewboyson 13:9cd54f7db57a 23 #define MDNS_UNICAST false
andrewboyson 13:9cd54f7db57a 24
andrewboyson 35:93c39d260a83 25 char DnsQueryName[DNS_MAX_LABEL_LENGTH+1];
andrewboyson 13:9cd54f7db57a 26 uint32_t DnsQueryIp4 = 0;
andrewboyson 13:9cd54f7db57a 27 char DnsQueryIp6[16];
andrewboyson 30:e34173b7585c 28 bool DnsQueryIsBusy = false;
andrewboyson 13:9cd54f7db57a 29
andrewboyson 171:f708d6776752 30 static char _RecordType = DNS_RECORD_NONE;
andrewboyson 171:f708d6776752 31 static int _DnsProtocol = DNS_PROTOCOL_NONE;
andrewboyson 171:f708d6776752 32 static int _IpProtocol = 0;
andrewboyson 171:f708d6776752 33 static uint32_t _StartedMs = 0;
andrewboyson 171:f708d6776752 34
andrewboyson 13:9cd54f7db57a 35 static void reap()
andrewboyson 13:9cd54f7db57a 36 {
andrewboyson 13:9cd54f7db57a 37 if (!DnsQueryIsBusy) return;
andrewboyson 13:9cd54f7db57a 38
andrewboyson 171:f708d6776752 39 if (MsTimerRelative(_StartedMs, TIME_OUT_SENT_MS))
andrewboyson 13:9cd54f7db57a 40 {
andrewboyson 173:9bc30cd82a76 41 LogTimeF("DnsQuery reaped ongoing request for record type ");
andrewboyson 173:9bc30cd82a76 42 DnsRecordTypeLog(_RecordType);
andrewboyson 173:9bc30cd82a76 43 if (DnsQueryName[0]) { LogF(" name '%s'", DnsQueryName); }
andrewboyson 187:122fc1996c86 44 if (DnsQueryIp4) { Log(" address "); Ip4AddrLog(DnsQueryIp4); }
andrewboyson 187:122fc1996c86 45 if (DnsQueryIp6[0]) { Log(" address "); Ip6AddrLog(DnsQueryIp6); }
andrewboyson 173:9bc30cd82a76 46 Log(" using ");
andrewboyson 173:9bc30cd82a76 47 DnsProtocolLog(_DnsProtocol);
andrewboyson 173:9bc30cd82a76 48 Log(" over ");
andrewboyson 173:9bc30cd82a76 49 EthProtocolLog(_IpProtocol);
andrewboyson 13:9cd54f7db57a 50 LogF("\r\n");
andrewboyson 13:9cd54f7db57a 51
andrewboyson 13:9cd54f7db57a 52 DnsQueryName[0] = 0;
andrewboyson 13:9cd54f7db57a 53 DnsQueryIp4 = 0;
andrewboyson 13:9cd54f7db57a 54 DnsQueryIp6[0] = 0;
andrewboyson 13:9cd54f7db57a 55 DnsQueryIsBusy = false;
andrewboyson 171:f708d6776752 56 _StartedMs = MsTimerCount;
andrewboyson 171:f708d6776752 57 _DnsProtocol = DNS_PROTOCOL_NONE;
andrewboyson 171:f708d6776752 58 _IpProtocol = 0;
andrewboyson 171:f708d6776752 59 _RecordType = DNS_RECORD_NONE;
andrewboyson 13:9cd54f7db57a 60 }
andrewboyson 13:9cd54f7db57a 61 }
andrewboyson 43:bc028d5a6424 62 void DnsQueryMain()
andrewboyson 13:9cd54f7db57a 63 {
andrewboyson 93:580fc113d9e9 64 reap();
andrewboyson 13:9cd54f7db57a 65 }
andrewboyson 171:f708d6776752 66 void DnsQueryIp4FromName(char * name, int dnsProtocol, int ipProtocol)
andrewboyson 13:9cd54f7db57a 67 {
andrewboyson 176:7eb916c22084 68 if (!name[0])
andrewboyson 176:7eb916c22084 69 {
andrewboyson 176:7eb916c22084 70 LogTime("DnsQueryIp4FromName called with no name\r\n");
andrewboyson 176:7eb916c22084 71 return;
andrewboyson 176:7eb916c22084 72 }
andrewboyson 171:f708d6776752 73 DnsLabelMakeFullNameFromName(dnsProtocol, name, sizeof(DnsQueryName), DnsQueryName);
andrewboyson 171:f708d6776752 74 DnsQueryIp4 = 0;
andrewboyson 171:f708d6776752 75 DnsQueryIp6[0] = 0;
andrewboyson 171:f708d6776752 76 DnsQueryIsBusy = true;
andrewboyson 171:f708d6776752 77 _StartedMs = MsTimerCount;
andrewboyson 171:f708d6776752 78 _DnsProtocol = dnsProtocol;
andrewboyson 171:f708d6776752 79 _IpProtocol = ipProtocol;
andrewboyson 171:f708d6776752 80 _RecordType = DNS_RECORD_A;
andrewboyson 13:9cd54f7db57a 81 }
andrewboyson 171:f708d6776752 82 void DnsQueryIp6FromName(char * name, int dnsProtocol, int ipProtocol)
andrewboyson 13:9cd54f7db57a 83 {
andrewboyson 176:7eb916c22084 84 if (!name[0])
andrewboyson 176:7eb916c22084 85 {
andrewboyson 176:7eb916c22084 86 LogTime("DnsQueryIp6FromName called with no name\r\n");
andrewboyson 176:7eb916c22084 87 return;
andrewboyson 176:7eb916c22084 88 }
andrewboyson 171:f708d6776752 89 DnsLabelMakeFullNameFromName(dnsProtocol, name, sizeof(DnsQueryName), DnsQueryName);
andrewboyson 171:f708d6776752 90 DnsQueryIp4 = 0;
andrewboyson 171:f708d6776752 91 DnsQueryIp6[0] = 0;
andrewboyson 171:f708d6776752 92 DnsQueryIsBusy = true;
andrewboyson 171:f708d6776752 93 _StartedMs = MsTimerCount;
andrewboyson 171:f708d6776752 94 _DnsProtocol = dnsProtocol;
andrewboyson 171:f708d6776752 95 _IpProtocol = ipProtocol;
andrewboyson 171:f708d6776752 96 _RecordType = DNS_RECORD_AAAA;
andrewboyson 13:9cd54f7db57a 97 }
andrewboyson 171:f708d6776752 98 void DnsQueryNameFromIp4(uint32_t ip, int dnsProtocol, int ipProtocol)
andrewboyson 13:9cd54f7db57a 99 {
andrewboyson 176:7eb916c22084 100 if (!ip)
andrewboyson 176:7eb916c22084 101 {
andrewboyson 176:7eb916c22084 102 LogTime("DnsQueryNameFromIp4 called with no ip\r\n");
andrewboyson 176:7eb916c22084 103 return;
andrewboyson 176:7eb916c22084 104 }
andrewboyson 171:f708d6776752 105 DnsQueryName[0] = 0;
andrewboyson 171:f708d6776752 106 DnsQueryIp4 = ip;
andrewboyson 171:f708d6776752 107 DnsQueryIp6[0] = 0;
andrewboyson 171:f708d6776752 108 DnsQueryIsBusy = true;
andrewboyson 171:f708d6776752 109 _StartedMs = MsTimerCount;
andrewboyson 171:f708d6776752 110 _DnsProtocol = dnsProtocol;
andrewboyson 171:f708d6776752 111 _IpProtocol = ipProtocol;
andrewboyson 171:f708d6776752 112 _RecordType = DNS_RECORD_PTR;
andrewboyson 13:9cd54f7db57a 113 }
andrewboyson 171:f708d6776752 114 void DnsQueryNameFromIp6(char* ip, int dnsProtocol, int ipProtocol)
andrewboyson 13:9cd54f7db57a 115 {
andrewboyson 176:7eb916c22084 116 if (!ip[0])
andrewboyson 176:7eb916c22084 117 {
andrewboyson 176:7eb916c22084 118 LogTime("DnsQueryNameFromIp6 called with no ip\r\n");
andrewboyson 176:7eb916c22084 119 return;
andrewboyson 176:7eb916c22084 120 }
andrewboyson 171:f708d6776752 121 DnsQueryName[0] = 0;
andrewboyson 171:f708d6776752 122 DnsQueryIp4 = 0;
andrewboyson 172:9bc3c7b2cca1 123 Ip6AddrCopy(DnsQueryIp6, ip);
andrewboyson 171:f708d6776752 124 DnsQueryIsBusy = true;
andrewboyson 171:f708d6776752 125 _StartedMs = MsTimerCount;
andrewboyson 171:f708d6776752 126 _DnsProtocol = dnsProtocol;
andrewboyson 171:f708d6776752 127 _IpProtocol = ipProtocol;
andrewboyson 171:f708d6776752 128 _RecordType = DNS_RECORD_PTR;
andrewboyson 30:e34173b7585c 129 }
andrewboyson 30:e34173b7585c 130 static void logQuery()
andrewboyson 30:e34173b7585c 131 {
andrewboyson 43:bc028d5a6424 132 if (NetTraceNewLine) Log("\r\n");
andrewboyson 47:73af5c0b0dc2 133 LogTimeF("DnsQuery sent ");
andrewboyson 171:f708d6776752 134 DnsProtocolLog(_DnsProtocol);
andrewboyson 47:73af5c0b0dc2 135 Log(" request for ");
andrewboyson 171:f708d6776752 136 DnsRecordTypeLog(_RecordType);
andrewboyson 47:73af5c0b0dc2 137 Log(" ");
andrewboyson 30:e34173b7585c 138 if (DnsQueryIp4) //Reverse
andrewboyson 30:e34173b7585c 139 {
andrewboyson 187:122fc1996c86 140 Ip4AddrLog(DnsQueryIp4);
andrewboyson 30:e34173b7585c 141 }
andrewboyson 30:e34173b7585c 142 else if (DnsQueryIp6[0])
andrewboyson 30:e34173b7585c 143 {
andrewboyson 172:9bc3c7b2cca1 144 Ip6AddrLog(DnsQueryIp6);
andrewboyson 30:e34173b7585c 145 }
andrewboyson 30:e34173b7585c 146 else //Forward
andrewboyson 30:e34173b7585c 147 {
andrewboyson 47:73af5c0b0dc2 148 Log(DnsQueryName);
andrewboyson 30:e34173b7585c 149 }
andrewboyson 47:73af5c0b0dc2 150 Log("\r\n");
andrewboyson 13:9cd54f7db57a 151 }
andrewboyson 171:f708d6776752 152 int DnsQueryPoll(int ipType, void* pPacket, int* pSize)
andrewboyson 13:9cd54f7db57a 153 {
andrewboyson 59:e0e556c8bd46 154 DnsHdrSetup(pPacket, *pSize);
andrewboyson 59:e0e556c8bd46 155
andrewboyson 171:f708d6776752 156 if (!DnsQueryIsBusy) return DO_NOTHING;
andrewboyson 172:9bc3c7b2cca1 157 if (_IpProtocol != EthProtocol) return DO_NOTHING; //Only use a poll from the required protocol
andrewboyson 171:f708d6776752 158 if (_DnsProtocol == DNS_PROTOCOL_UDNS && DhcpLocalIp == 0) return DO_NOTHING;
andrewboyson 173:9bc30cd82a76 159 if (_RecordType == DNS_RECORD_NONE) return DO_NOTHING;
andrewboyson 173:9bc30cd82a76 160 if (_DnsProtocol == DNS_PROTOCOL_NONE) return DO_NOTHING;
andrewboyson 13:9cd54f7db57a 161
andrewboyson 57:e0fb648acf48 162 NetTraceHostCheckIp6(DnsQueryIp6);
andrewboyson 57:e0fb648acf48 163
andrewboyson 57:e0fb648acf48 164 if (DnsQueryTrace || NetTraceHostGetMatched()) logQuery();
andrewboyson 30:e34173b7585c 165
andrewboyson 13:9cd54f7db57a 166 static uint16_t id = 0;
andrewboyson 13:9cd54f7db57a 167 DnsHdrId = ++id;
andrewboyson 13:9cd54f7db57a 168 DnsHdrIsReply = false;
andrewboyson 171:f708d6776752 169 DnsHdrIsAuthoritative = false; //Added 12/12/2020
andrewboyson 13:9cd54f7db57a 170 DnsHdrIsRecursiveQuery = false;
andrewboyson 13:9cd54f7db57a 171
andrewboyson 13:9cd54f7db57a 172 DnsHdrQdcount = 1;
andrewboyson 13:9cd54f7db57a 173 DnsHdrAncount = 0;
andrewboyson 13:9cd54f7db57a 174 DnsHdrNscount = 0;
andrewboyson 13:9cd54f7db57a 175 DnsHdrArcount = 0;
andrewboyson 13:9cd54f7db57a 176
andrewboyson 13:9cd54f7db57a 177 DnsHdrWrite();
andrewboyson 13:9cd54f7db57a 178 char* p = DnsHdrData;
andrewboyson 13:9cd54f7db57a 179
andrewboyson 176:7eb916c22084 180 if (DnsQueryIp4 ) DnsNameEncodeIp4(DnsQueryIp4, &p);
andrewboyson 176:7eb916c22084 181 else if (DnsQueryIp6[0] ) DnsNameEncodeIp6(DnsQueryIp6, &p);
andrewboyson 176:7eb916c22084 182 else if (DnsQueryName[0]) DnsNameEncodePtr(DnsQueryName, &p);
andrewboyson 176:7eb916c22084 183 else return DO_NOTHING;
andrewboyson 30:e34173b7585c 184
andrewboyson 30:e34173b7585c 185 *p++ = 0;
andrewboyson 171:f708d6776752 186 *p++ = _RecordType;
andrewboyson 171:f708d6776752 187 *p++ = _DnsProtocol == DNS_PROTOCOL_MDNS && MDNS_UNICAST ? 0x80 : 0; //Set the 15th bit (UNICAST_RESPONSE) to 1 if MDNS
andrewboyson 13:9cd54f7db57a 188 *p++ = 1; //QCLASS_IN = 1 - internet
andrewboyson 13:9cd54f7db57a 189
andrewboyson 13:9cd54f7db57a 190 *pSize = p - DnsHdrPacket;
andrewboyson 13:9cd54f7db57a 191
andrewboyson 13:9cd54f7db57a 192 DnsQueryIsBusy = false;
andrewboyson 38:cc8945857a0d 193
andrewboyson 171:f708d6776752 194 if (DnsQueryTrace || NetTraceHostGetMatched()) DnsHdrLog(_DnsProtocol);
andrewboyson 13:9cd54f7db57a 195
andrewboyson 37:793b39683406 196 int dest = DO_NOTHING;
andrewboyson 37:793b39683406 197
andrewboyson 171:f708d6776752 198 switch (_DnsProtocol)
andrewboyson 13:9cd54f7db57a 199 {
andrewboyson 37:793b39683406 200 case DNS_PROTOCOL_UDNS: dest = UNICAST_DNS; break; //IPv6 ==> NdpDnsServer; IPv4 ==> DhcpDnsServer
andrewboyson 37:793b39683406 201 case DNS_PROTOCOL_MDNS: dest = MULTICAST_MDNS; break;
andrewboyson 37:793b39683406 202 case DNS_PROTOCOL_LLMNR: dest = MULTICAST_LLMNR; break;
andrewboyson 13:9cd54f7db57a 203 default:
andrewboyson 171:f708d6776752 204 LogTimeF("DNS unknown query protocol %d\r\n", _DnsProtocol);
andrewboyson 13:9cd54f7db57a 205 return DO_NOTHING;
andrewboyson 13:9cd54f7db57a 206 }
andrewboyson 37:793b39683406 207
andrewboyson 57:e0fb648acf48 208 return ActionMakeFromDestAndTrace(dest, DnsQueryTrace || NetTraceHostGetMatched());
andrewboyson 13:9cd54f7db57a 209 }