Andrew Boyson / net

A stack which works with or without an Mbed os library. Provides IPv4 or IPv6 with a full 1500 byte buffer.

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udp/dns/dns.c@128:79052cb4a41c, 2019-03-11 (annotated)

Committer:
andrewboyson
Date:
Mon Mar 11 16:42:45 2019 +0000
Revision:
128:79052cb4a41c
Parent:
116:60521b29e4c9
Child:
170:96c637dc3f52
Tidied up the DNS label module and removed some declarations that had not left room for the terminating null.

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 #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 116:60521b29e4c9 67 case DNS_PROTOCOL_NONE: return DNS_PROTOCOL_MDNS;
andrewboyson 32:679654f2d023 68 case DNS_PROTOCOL_MDNS: return DNS_PROTOCOL_LLMNR;
andrewboyson 116:60521b29e4c9 69 case DNS_PROTOCOL_LLMNR: return DNS_PROTOCOL_UDNS;
andrewboyson 116:60521b29e4c9 70 case DNS_PROTOCOL_UDNS: 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 13:9cd54f7db57a 85
andrewboyson 43:bc028d5a6424 86 void DnsMain()
andrewboyson 13:9cd54f7db57a 87 {
andrewboyson 43:bc028d5a6424 88 DnsQueryMain();
andrewboyson 13:9cd54f7db57a 89 }
andrewboyson 13:9cd54f7db57a 90
andrewboyson 59:e0e556c8bd46 91 int DnsHandlePacketReceived(void (*traceback)(void), int dnsProtocol, int sizeRx, void* pPacketRx, int* pSizeTx, void* pPacketTx)
andrewboyson 13:9cd54f7db57a 92 {
andrewboyson 59:e0e556c8bd46 93 DnsHdrSetup(pPacketRx, sizeRx);
andrewboyson 13:9cd54f7db57a 94 DnsHdrRead();
andrewboyson 59:e0e556c8bd46 95
andrewboyson 13:9cd54f7db57a 96 int action;
andrewboyson 13:9cd54f7db57a 97 if (DnsHdrIsReply)
andrewboyson 13:9cd54f7db57a 98 {
andrewboyson 59:e0e556c8bd46 99 action = DnsReplyHandle(traceback, dnsProtocol);
andrewboyson 13:9cd54f7db57a 100 }
andrewboyson 13:9cd54f7db57a 101 else
andrewboyson 13:9cd54f7db57a 102 {
andrewboyson 59:e0e556c8bd46 103 action = DnsServerHandleQuery(traceback, dnsProtocol, pPacketTx, pSizeTx);
andrewboyson 13:9cd54f7db57a 104 }
andrewboyson 13:9cd54f7db57a 105 return action;
andrewboyson 13:9cd54f7db57a 106 }
andrewboyson 13:9cd54f7db57a 107
andrewboyson 59:e0e556c8bd46 108 int DnsPollForPacketToSend(void* pPacketTx, int* pSize)
andrewboyson 13:9cd54f7db57a 109 {
andrewboyson 59:e0e556c8bd46 110 return DnsQueryPoll(pPacketTx, pSize);
andrewboyson 13:9cd54f7db57a 111 }