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

ip4/ip4addr.c@193:47a953ab571b, 2021-01-24 (annotated)

Committer:
andrewboyson
Date:
Sun Jan 24 15:09:55 2021 +0000
Revision:
193:47a953ab571b
Parent:
187:122fc1996c86
Child:
195:bd5b123143ca
Fixed ability of name resolution to use IPv6 - the MAC for the DNS server IP address had to be made available.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 61:aad055f1b0d1 1 #include <stdint.h>
andrewboyson 61:aad055f1b0d1 2 #include <stdio.h>
andrewboyson 61:aad055f1b0d1 3
andrewboyson 49:1a6336f2b3f9 4 #include "log.h"
andrewboyson 49:1a6336f2b3f9 5 #include "http.h"
andrewboyson 49:1a6336f2b3f9 6 #include "action.h"
andrewboyson 49:1a6336f2b3f9 7 #include "ip4addr.h"
andrewboyson 49:1a6336f2b3f9 8 #include "dhcp.h"
andrewboyson 112:f8694d0b8858 9 #include "ntpclient.h"
andrewboyson 57:e0fb648acf48 10 #include "tftp.h"
andrewboyson 49:1a6336f2b3f9 11
andrewboyson 187:122fc1996c86 12 int Ip4AddrToString(const uint32_t ip, const int size, char* text)
andrewboyson 49:1a6336f2b3f9 13 {
andrewboyson 49:1a6336f2b3f9 14 int a0 = (ip & 0xFF000000) >> 24;
andrewboyson 49:1a6336f2b3f9 15 int a1 = (ip & 0x00FF0000) >> 16;
andrewboyson 49:1a6336f2b3f9 16 int a2 = (ip & 0x0000FF00) >> 8;
andrewboyson 49:1a6336f2b3f9 17 int a3 = (ip & 0x000000FF);
andrewboyson 49:1a6336f2b3f9 18 return snprintf(text, size, "%d.%d.%d.%d", a3, a2, a1, a0);
andrewboyson 49:1a6336f2b3f9 19 }
andrewboyson 187:122fc1996c86 20 int Ip4AddrLog(const uint32_t ip)
andrewboyson 49:1a6336f2b3f9 21 {
andrewboyson 49:1a6336f2b3f9 22 int a0 = (ip & 0xFF000000) >> 24;
andrewboyson 49:1a6336f2b3f9 23 int a1 = (ip & 0x00FF0000) >> 16;
andrewboyson 49:1a6336f2b3f9 24 int a2 = (ip & 0x0000FF00) >> 8;
andrewboyson 49:1a6336f2b3f9 25 int a3 = (ip & 0x000000FF);
andrewboyson 49:1a6336f2b3f9 26 return LogF("%d.%d.%d.%d", a3, a2, a1, a0);
andrewboyson 49:1a6336f2b3f9 27 }
andrewboyson 187:122fc1996c86 28 int Ip4AddrHttp(const uint32_t ip)
andrewboyson 49:1a6336f2b3f9 29 {
andrewboyson 49:1a6336f2b3f9 30 int a0 = (ip & 0xFF000000) >> 24;
andrewboyson 49:1a6336f2b3f9 31 int a1 = (ip & 0x00FF0000) >> 16;
andrewboyson 49:1a6336f2b3f9 32 int a2 = (ip & 0x0000FF00) >> 8;
andrewboyson 49:1a6336f2b3f9 33 int a3 = (ip & 0x000000FF);
andrewboyson 54:84ef2b29cf7e 34 return HttpAddF("%d.%d.%d.%d", a3, a2, a1, a0);
andrewboyson 49:1a6336f2b3f9 35 }
andrewboyson 49:1a6336f2b3f9 36
andrewboyson 193:47a953ab571b 37 uint32_t Ip4AddrParse(const char* pText) //Returns 0 on error
andrewboyson 49:1a6336f2b3f9 38 {
andrewboyson 193:47a953ab571b 39 const char* p = pText;
andrewboyson 49:1a6336f2b3f9 40 int ints[4];
andrewboyson 193:47a953ab571b 41 int field = 0;
andrewboyson 193:47a953ab571b 42 int word = 0;
andrewboyson 193:47a953ab571b 43 while(true)
andrewboyson 193:47a953ab571b 44 {
andrewboyson 193:47a953ab571b 45 switch (*p)
andrewboyson 193:47a953ab571b 46 {
andrewboyson 193:47a953ab571b 47 case '.':
andrewboyson 193:47a953ab571b 48 ints[field] = word;
andrewboyson 193:47a953ab571b 49 field++;
andrewboyson 193:47a953ab571b 50 if (field > 3) return 0;
andrewboyson 193:47a953ab571b 51 word = 0;
andrewboyson 193:47a953ab571b 52 break;
andrewboyson 193:47a953ab571b 53 case '0': word *= 10; word += 0; break;
andrewboyson 193:47a953ab571b 54 case '1': word *= 10; word += 1; break;
andrewboyson 193:47a953ab571b 55 case '2': word *= 10; word += 2; break;
andrewboyson 193:47a953ab571b 56 case '3': word *= 10; word += 3; break;
andrewboyson 193:47a953ab571b 57 case '4': word *= 10; word += 4; break;
andrewboyson 193:47a953ab571b 58 case '5': word *= 10; word += 5; break;
andrewboyson 193:47a953ab571b 59 case '6': word *= 10; word += 6; break;
andrewboyson 193:47a953ab571b 60 case '7': word *= 10; word += 7; break;
andrewboyson 193:47a953ab571b 61 case '8': word *= 10; word += 8; break;
andrewboyson 193:47a953ab571b 62 case '9': word *= 10; word += 9; break;
andrewboyson 193:47a953ab571b 63 case 0:
andrewboyson 193:47a953ab571b 64 ints[field] = word;
andrewboyson 193:47a953ab571b 65 uint32_t addr4 = (ints[0] << 0) + (ints[1] << 8) + (ints[2] << 16) + (ints[3] << 24);
andrewboyson 193:47a953ab571b 66 return addr4;
andrewboyson 193:47a953ab571b 67 default: return 0;
andrewboyson 193:47a953ab571b 68 }
andrewboyson 193:47a953ab571b 69 p++;
andrewboyson 193:47a953ab571b 70 }
andrewboyson 49:1a6336f2b3f9 71 }
andrewboyson 187:122fc1996c86 72 void Ip4AddrFromDest(const int dest, uint32_t* pDstIp)
andrewboyson 49:1a6336f2b3f9 73 {
andrewboyson 49:1a6336f2b3f9 74 switch (dest)
andrewboyson 49:1a6336f2b3f9 75 {
andrewboyson 49:1a6336f2b3f9 76 case UNICAST: /*No change*/ break;
andrewboyson 116:60521b29e4c9 77 case UNICAST_DNS: *pDstIp = DhcpDnsServerIp; break;
andrewboyson 116:60521b29e4c9 78 case UNICAST_DHCP: *pDstIp = DhcpServerIp; break;
andrewboyson 113:904b40231907 79 case UNICAST_NTP: *pDstIp = NtpClientQueryServerIp4; break;
andrewboyson 57:e0fb648acf48 80 case UNICAST_TFTP: *pDstIp = TftpServerIp4; break;
andrewboyson 49:1a6336f2b3f9 81 case MULTICAST_NODE: *pDstIp = IP4_MULTICAST_ALL_HOSTS; break;
andrewboyson 49:1a6336f2b3f9 82 case MULTICAST_ROUTER: *pDstIp = IP4_MULTICAST_ALL_ROUTERS; break;
andrewboyson 49:1a6336f2b3f9 83 case MULTICAST_MDNS: *pDstIp = IP4_MULTICAST_DNS_ADDRESS; break;
andrewboyson 49:1a6336f2b3f9 84 case MULTICAST_LLMNR: *pDstIp = IP4_MULTICAST_LLMNR_ADDRESS; break;
andrewboyson 107:cc58b4c2090b 85 case MULTICAST_NTP: *pDstIp = IP4_MULTICAST_NTP_ADDRESS; break;
andrewboyson 49:1a6336f2b3f9 86 case BROADCAST: *pDstIp = IP4_BROADCAST_ADDRESS; break;
andrewboyson 49:1a6336f2b3f9 87 default:
andrewboyson 52:fbc5a46b5e16 88 LogTimeF("Ip4AddressFromDest unknown destination %d\r\n", dest);
andrewboyson 49:1a6336f2b3f9 89 break;
andrewboyson 49:1a6336f2b3f9 90 }
andrewboyson 49:1a6336f2b3f9 91 }
andrewboyson 187:122fc1996c86 92 bool Ip4AddrIsExternal(uint32_t ip)
andrewboyson 187:122fc1996c86 93 //Logic is if it isn't local and it isn't one of the three types of broadcast then it must be external.
andrewboyson 183:ee809769bf89 94 {
andrewboyson 183:ee809769bf89 95 if ((ip & DhcpSubnetMask) == (DhcpLocalIp & DhcpSubnetMask)) return false; // Ip is same as local ip in the unmasked area
andrewboyson 183:ee809769bf89 96 if ( ip == (DhcpLocalIp | 0xFF000000) ) return false; // Ip == 192.168.0.255; '|' is lower precendence than '=='
andrewboyson 183:ee809769bf89 97 if ( ip == IP4_BROADCAST_ADDRESS ) return false; // dstIp == 255.255.255.255
andrewboyson 183:ee809769bf89 98 if ((ip & 0xE0) == 0xE0 ) return false; // 224.x.x.x == 1110 0000 == E0.xx.xx.xx == xx.xx.xx.E0 in little endian
andrewboyson 186:24198369b198 99
andrewboyson 183:ee809769bf89 100 return true;
andrewboyson 183:ee809769bf89 101 }