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/dns.c@83:08c983006a6e, 2018-11-17 (annotated)
- Committer:
- andrewboyson
- Date:
- Sat Nov 17 15:49:03 2018 +0000
- Revision:
- 83:08c983006a6e
- Parent:
- 61:aad055f1b0d1
- Child:
- 116:60521b29e4c9
Added "send requests via IPv4" toggles for DNS, NTP and TFTP.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
andrewboyson | 61:aad055f1b0d1 | 1 | #include <stdint.h> |
andrewboyson | 61:aad055f1b0d1 | 2 | #include <stdbool.h> |
andrewboyson | 61:aad055f1b0d1 | 3 | #include <string.h> |
andrewboyson | 61:aad055f1b0d1 | 4 | #include <stdio.h> |
andrewboyson | 61:aad055f1b0d1 | 5 | |
andrewboyson | 13:9cd54f7db57a | 6 | #include "dns.h" |
andrewboyson | 13:9cd54f7db57a | 7 | #include "dnshdr.h" |
andrewboyson | 13:9cd54f7db57a | 8 | #include "dnsquery.h" |
andrewboyson | 13:9cd54f7db57a | 9 | #include "dnsreply.h" |
andrewboyson | 13:9cd54f7db57a | 10 | #include "dnsserver.h" |
andrewboyson | 32:679654f2d023 | 11 | #include "log.h" |
andrewboyson | 32:679654f2d023 | 12 | #include "dhcp.h" |
andrewboyson | 13:9cd54f7db57a | 13 | |
andrewboyson | 83:08c983006a6e | 14 | |
andrewboyson | 83:08c983006a6e | 15 | bool DnsSendRequestsViaIp4 = false; |
andrewboyson | 83:08c983006a6e | 16 | |
andrewboyson | 47:73af5c0b0dc2 | 17 | void DnsProtocolString(uint8_t protocol, int size, char* text) |
andrewboyson | 13:9cd54f7db57a | 18 | { |
andrewboyson | 13:9cd54f7db57a | 19 | switch (protocol) |
andrewboyson | 13:9cd54f7db57a | 20 | { |
andrewboyson | 13:9cd54f7db57a | 21 | case DNS_PROTOCOL_UDNS: strncpy (text, "DNS", size); break; |
andrewboyson | 13:9cd54f7db57a | 22 | case DNS_PROTOCOL_MDNS: strncpy (text, "MDNS", size); break; |
andrewboyson | 13:9cd54f7db57a | 23 | case DNS_PROTOCOL_LLMNR: strncpy (text, "LLMNR", size); break; |
andrewboyson | 13:9cd54f7db57a | 24 | default: snprintf(text, size, "%d", protocol); break; |
andrewboyson | 13:9cd54f7db57a | 25 | } |
andrewboyson | 13:9cd54f7db57a | 26 | } |
andrewboyson | 13:9cd54f7db57a | 27 | |
andrewboyson | 47:73af5c0b0dc2 | 28 | void DnsRecordTypeString(uint8_t recordtype, int size, char* text) |
andrewboyson | 13:9cd54f7db57a | 29 | { |
andrewboyson | 13:9cd54f7db57a | 30 | switch (recordtype) |
andrewboyson | 13:9cd54f7db57a | 31 | { |
andrewboyson | 13:9cd54f7db57a | 32 | case DNS_RECORD_A: strncpy (text, "A", size); break; |
andrewboyson | 13:9cd54f7db57a | 33 | case DNS_RECORD_AAAA: strncpy (text, "AAAA", size); break; |
andrewboyson | 13:9cd54f7db57a | 34 | case DNS_RECORD_PTR: strncpy (text, "PTR", size); break; |
andrewboyson | 15:6ca6778168b1 | 35 | case DNS_RECORD_TXT: strncpy (text, "TXT", size); break; |
andrewboyson | 15:6ca6778168b1 | 36 | case DNS_RECORD_SRV: strncpy (text, "SRV", size); break; |
andrewboyson | 13:9cd54f7db57a | 37 | default: snprintf(text, size, "%d", recordtype); break; |
andrewboyson | 13:9cd54f7db57a | 38 | } |
andrewboyson | 13:9cd54f7db57a | 39 | } |
andrewboyson | 47:73af5c0b0dc2 | 40 | void DnsProtocolLog(uint8_t protocol) |
andrewboyson | 47:73af5c0b0dc2 | 41 | { |
andrewboyson | 47:73af5c0b0dc2 | 42 | switch (protocol) |
andrewboyson | 47:73af5c0b0dc2 | 43 | { |
andrewboyson | 47:73af5c0b0dc2 | 44 | case DNS_PROTOCOL_UDNS: Log ("DNS "); break; |
andrewboyson | 47:73af5c0b0dc2 | 45 | case DNS_PROTOCOL_MDNS: Log ("MDNS "); break; |
andrewboyson | 47:73af5c0b0dc2 | 46 | case DNS_PROTOCOL_LLMNR: Log ("LLMNR"); break; |
andrewboyson | 47:73af5c0b0dc2 | 47 | default: LogF("%d", protocol); break; |
andrewboyson | 47:73af5c0b0dc2 | 48 | } |
andrewboyson | 47:73af5c0b0dc2 | 49 | } |
andrewboyson | 47:73af5c0b0dc2 | 50 | |
andrewboyson | 47:73af5c0b0dc2 | 51 | void DnsRecordTypeLog(uint8_t recordtype) |
andrewboyson | 47:73af5c0b0dc2 | 52 | { |
andrewboyson | 47:73af5c0b0dc2 | 53 | switch (recordtype) |
andrewboyson | 47:73af5c0b0dc2 | 54 | { |
andrewboyson | 47:73af5c0b0dc2 | 55 | case DNS_RECORD_A: Log ("A" ); break; |
andrewboyson | 47:73af5c0b0dc2 | 56 | case DNS_RECORD_AAAA: Log ("AAAA"); break; |
andrewboyson | 47:73af5c0b0dc2 | 57 | case DNS_RECORD_PTR: Log ("PTR" ); break; |
andrewboyson | 47:73af5c0b0dc2 | 58 | case DNS_RECORD_TXT: Log ("TXT" ); break; |
andrewboyson | 47:73af5c0b0dc2 | 59 | case DNS_RECORD_SRV: Log ("SRV" ); break; |
andrewboyson | 47:73af5c0b0dc2 | 60 | default: LogF("%d", recordtype); break; |
andrewboyson | 47:73af5c0b0dc2 | 61 | } |
andrewboyson | 47:73af5c0b0dc2 | 62 | } |
andrewboyson | 41:db727df5f98b | 63 | int DnsGetNextProtocol4(int protocol) |
andrewboyson | 32:679654f2d023 | 64 | { |
andrewboyson | 32:679654f2d023 | 65 | switch(protocol) |
andrewboyson | 32:679654f2d023 | 66 | { |
andrewboyson | 32:679654f2d023 | 67 | case DNS_PROTOCOL_NONE: return DNS_PROTOCOL_UDNS; |
andrewboyson | 32:679654f2d023 | 68 | case DNS_PROTOCOL_UDNS: return DNS_PROTOCOL_MDNS; |
andrewboyson | 32:679654f2d023 | 69 | case DNS_PROTOCOL_MDNS: return DNS_PROTOCOL_LLMNR; |
andrewboyson | 32:679654f2d023 | 70 | case DNS_PROTOCOL_LLMNR: return DNS_PROTOCOL_NONE; |
andrewboyson | 32:679654f2d023 | 71 | default: LogTimeF("DNS invalid protocol %d\r\n", protocol); return DNS_PROTOCOL_NONE; |
andrewboyson | 32:679654f2d023 | 72 | } |
andrewboyson | 32:679654f2d023 | 73 | } |
andrewboyson | 41:db727df5f98b | 74 | int DnsGetNextProtocol6(int protocol) |
andrewboyson | 41:db727df5f98b | 75 | { |
andrewboyson | 41:db727df5f98b | 76 | switch(protocol) |
andrewboyson | 41:db727df5f98b | 77 | { |
andrewboyson | 41:db727df5f98b | 78 | case DNS_PROTOCOL_NONE: return DNS_PROTOCOL_MDNS; |
andrewboyson | 41:db727df5f98b | 79 | case DNS_PROTOCOL_MDNS: return DNS_PROTOCOL_LLMNR; |
andrewboyson | 41:db727df5f98b | 80 | case DNS_PROTOCOL_LLMNR: return DNS_PROTOCOL_UDNS; |
andrewboyson | 41:db727df5f98b | 81 | case DNS_PROTOCOL_UDNS: return DNS_PROTOCOL_NONE; |
andrewboyson | 41:db727df5f98b | 82 | default: LogTimeF("DNS invalid protocol %d\r\n", protocol); return DNS_PROTOCOL_NONE; |
andrewboyson | 41:db727df5f98b | 83 | } |
andrewboyson | 41:db727df5f98b | 84 | } |
andrewboyson | 33:714a0345e59b | 85 | bool DnsHostNamesEquate(char* pA, char* pB) |
andrewboyson | 33:714a0345e59b | 86 | { |
andrewboyson | 33:714a0345e59b | 87 | while(true) |
andrewboyson | 33:714a0345e59b | 88 | { |
andrewboyson | 33:714a0345e59b | 89 | char a = *pA++; |
andrewboyson | 33:714a0345e59b | 90 | char b = *pB++; |
andrewboyson | 33:714a0345e59b | 91 | if (a >= 'A' && a <= 'Z') a |= 0x20; //Make lower case |
andrewboyson | 33:714a0345e59b | 92 | if (b >= 'A' && b <= 'Z') b |= 0x20; //Make lower case |
andrewboyson | 33:714a0345e59b | 93 | if (a != b) return false; //If different then stop and return the fact |
andrewboyson | 33:714a0345e59b | 94 | if (!a) break; //No need to check 'b' too as it will necessarily be equal to 'a' at this point. |
andrewboyson | 33:714a0345e59b | 95 | } |
andrewboyson | 33:714a0345e59b | 96 | return true; //If we get here the strings must equate. |
andrewboyson | 33:714a0345e59b | 97 | } |
andrewboyson | 33:714a0345e59b | 98 | |
andrewboyson | 59:e0e556c8bd46 | 99 | int DnsMakeFullNameFromName(int protocol, const char* p, int size, char* result) |
andrewboyson | 32:679654f2d023 | 100 | { |
andrewboyson | 32:679654f2d023 | 101 | int i = 0; |
andrewboyson | 32:679654f2d023 | 102 | char c; |
andrewboyson | 32:679654f2d023 | 103 | |
andrewboyson | 32:679654f2d023 | 104 | while (i < size - 1) |
andrewboyson | 32:679654f2d023 | 105 | { |
andrewboyson | 32:679654f2d023 | 106 | c = *p++; |
andrewboyson | 32:679654f2d023 | 107 | if (!c) break; |
andrewboyson | 32:679654f2d023 | 108 | *result++ = c; |
andrewboyson | 32:679654f2d023 | 109 | i++; |
andrewboyson | 32:679654f2d023 | 110 | } |
andrewboyson | 32:679654f2d023 | 111 | if (protocol == DNS_PROTOCOL_MDNS) |
andrewboyson | 32:679654f2d023 | 112 | { |
andrewboyson | 32:679654f2d023 | 113 | p = ".local"; |
andrewboyson | 32:679654f2d023 | 114 | while (i < size - 1) |
andrewboyson | 32:679654f2d023 | 115 | { |
andrewboyson | 32:679654f2d023 | 116 | c = *p++; |
andrewboyson | 32:679654f2d023 | 117 | if (!c) break; |
andrewboyson | 32:679654f2d023 | 118 | *result++ = c; |
andrewboyson | 32:679654f2d023 | 119 | i++; |
andrewboyson | 32:679654f2d023 | 120 | } |
andrewboyson | 32:679654f2d023 | 121 | } |
andrewboyson | 32:679654f2d023 | 122 | if (protocol == DNS_PROTOCOL_UDNS && DhcpDomainName[0]) //Shouldn't do this in IPv6 as DHCP is IPv4 only |
andrewboyson | 32:679654f2d023 | 123 | { |
andrewboyson | 32:679654f2d023 | 124 | if (i < size - 1) |
andrewboyson | 32:679654f2d023 | 125 | { |
andrewboyson | 32:679654f2d023 | 126 | *result++ = '.'; |
andrewboyson | 32:679654f2d023 | 127 | i++; |
andrewboyson | 32:679654f2d023 | 128 | } |
andrewboyson | 32:679654f2d023 | 129 | p = DhcpDomainName; |
andrewboyson | 32:679654f2d023 | 130 | while (i < size - 1) |
andrewboyson | 32:679654f2d023 | 131 | { |
andrewboyson | 32:679654f2d023 | 132 | c = *p++; |
andrewboyson | 32:679654f2d023 | 133 | if (!c) break; |
andrewboyson | 32:679654f2d023 | 134 | *result++ = c; |
andrewboyson | 32:679654f2d023 | 135 | i++; |
andrewboyson | 32:679654f2d023 | 136 | } |
andrewboyson | 32:679654f2d023 | 137 | } |
andrewboyson | 32:679654f2d023 | 138 | *result = 0; //Terminate the resulting string |
andrewboyson | 32:679654f2d023 | 139 | return i; |
andrewboyson | 32:679654f2d023 | 140 | } |
andrewboyson | 32:679654f2d023 | 141 | int DnsStripNameFromFullName(int protocol, char* p, int size, char* result) |
andrewboyson | 32:679654f2d023 | 142 | { |
andrewboyson | 32:679654f2d023 | 143 | int i = 0; |
andrewboyson | 32:679654f2d023 | 144 | char c; |
andrewboyson | 32:679654f2d023 | 145 | |
andrewboyson | 32:679654f2d023 | 146 | while (i < size - 1) |
andrewboyson | 32:679654f2d023 | 147 | { |
andrewboyson | 32:679654f2d023 | 148 | c = *p++; |
andrewboyson | 32:679654f2d023 | 149 | if (c == 0) break; //End of the fqdn so stop |
andrewboyson | 32:679654f2d023 | 150 | if (c == '.') |
andrewboyson | 32:679654f2d023 | 151 | { |
andrewboyson | 32:679654f2d023 | 152 | if (protocol == DNS_PROTOCOL_UDNS) |
andrewboyson | 32:679654f2d023 | 153 | { |
andrewboyson | 32:679654f2d023 | 154 | if (strcmp(p, DhcpDomainName) == 0) break; //Strip the domain from a UDNS fqdn if, and only if, it matches the domain given in DHCP. IPv4 only. |
andrewboyson | 32:679654f2d023 | 155 | } |
andrewboyson | 32:679654f2d023 | 156 | else |
andrewboyson | 32:679654f2d023 | 157 | { |
andrewboyson | 32:679654f2d023 | 158 | break; //Strip the domain from an LLMNR (there shouldn't be one) or MDNS (it should always be '.local') fqdn |
andrewboyson | 32:679654f2d023 | 159 | } |
andrewboyson | 32:679654f2d023 | 160 | } |
andrewboyson | 32:679654f2d023 | 161 | *result++ = c; |
andrewboyson | 32:679654f2d023 | 162 | i++; |
andrewboyson | 32:679654f2d023 | 163 | } |
andrewboyson | 32:679654f2d023 | 164 | *result = 0; //Terminate the copied string |
andrewboyson | 32:679654f2d023 | 165 | return i; |
andrewboyson | 32:679654f2d023 | 166 | } |
andrewboyson | 13:9cd54f7db57a | 167 | |
andrewboyson | 43:bc028d5a6424 | 168 | void DnsMain() |
andrewboyson | 13:9cd54f7db57a | 169 | { |
andrewboyson | 43:bc028d5a6424 | 170 | DnsQueryMain(); |
andrewboyson | 13:9cd54f7db57a | 171 | } |
andrewboyson | 13:9cd54f7db57a | 172 | |
andrewboyson | 59:e0e556c8bd46 | 173 | int DnsHandlePacketReceived(void (*traceback)(void), int dnsProtocol, int sizeRx, void* pPacketRx, int* pSizeTx, void* pPacketTx) |
andrewboyson | 13:9cd54f7db57a | 174 | { |
andrewboyson | 59:e0e556c8bd46 | 175 | DnsHdrSetup(pPacketRx, sizeRx); |
andrewboyson | 13:9cd54f7db57a | 176 | DnsHdrRead(); |
andrewboyson | 59:e0e556c8bd46 | 177 | |
andrewboyson | 13:9cd54f7db57a | 178 | int action; |
andrewboyson | 13:9cd54f7db57a | 179 | if (DnsHdrIsReply) |
andrewboyson | 13:9cd54f7db57a | 180 | { |
andrewboyson | 59:e0e556c8bd46 | 181 | action = DnsReplyHandle(traceback, dnsProtocol); |
andrewboyson | 13:9cd54f7db57a | 182 | } |
andrewboyson | 13:9cd54f7db57a | 183 | else |
andrewboyson | 13:9cd54f7db57a | 184 | { |
andrewboyson | 59:e0e556c8bd46 | 185 | action = DnsServerHandleQuery(traceback, dnsProtocol, pPacketTx, pSizeTx); |
andrewboyson | 13:9cd54f7db57a | 186 | } |
andrewboyson | 13:9cd54f7db57a | 187 | return action; |
andrewboyson | 13:9cd54f7db57a | 188 | } |
andrewboyson | 13:9cd54f7db57a | 189 | |
andrewboyson | 59:e0e556c8bd46 | 190 | int DnsPollForPacketToSend(void* pPacketTx, int* pSize) |
andrewboyson | 13:9cd54f7db57a | 191 | { |
andrewboyson | 59:e0e556c8bd46 | 192 | return DnsQueryPoll(pPacketTx, pSize); |
andrewboyson | 13:9cd54f7db57a | 193 | } |