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Add v6 support to IPAddress to match ArduinoCore-API (#7174)
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* feat(ipaddress): add support for ipv6 type, following arduinocore api

* feat(ipaddress): align with latest arduinocore api

---------

Co-authored-by: Me No Dev <[email protected]>
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@sgryphon @me-no-dev
sgryphon and me-no-dev authored Dec 18, 2023
1 parent 71b1d76 commit 44f83b0
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289 changes: 266 additions & 23 deletions cores/esp32/IPAddress.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -20,78 +20,244 @@
#include <Arduino.h>
#include <IPAddress.h>
#include <Print.h>
#include <StreamString.h>

IPAddress::IPAddress()
IPAddress::IPAddress() : IPAddress(IPv4) {}

IPAddress::IPAddress(IPType ip_type)
{
_address.dword = 0;
_type = ip_type;
memset(_address.bytes, 0, sizeof(_address.bytes));
}

IPAddress::IPAddress(uint8_t first_octet, uint8_t second_octet, uint8_t third_octet, uint8_t fourth_octet)
{
_address.bytes[0] = first_octet;
_address.bytes[1] = second_octet;
_address.bytes[2] = third_octet;
_address.bytes[3] = fourth_octet;
_type = IPv4;
memset(_address.bytes, 0, sizeof(_address.bytes));
_address.bytes[IPADDRESS_V4_BYTES_INDEX] = first_octet;
_address.bytes[IPADDRESS_V4_BYTES_INDEX + 1] = second_octet;
_address.bytes[IPADDRESS_V4_BYTES_INDEX + 2] = third_octet;
_address.bytes[IPADDRESS_V4_BYTES_INDEX + 3] = fourth_octet;
}

IPAddress::IPAddress(uint8_t o1, uint8_t o2, uint8_t o3, uint8_t o4, uint8_t o5, uint8_t o6, uint8_t o7, uint8_t o8, uint8_t o9, uint8_t o10, uint8_t o11, uint8_t o12, uint8_t o13, uint8_t o14, uint8_t o15, uint8_t o16) {
_type = IPv6;
_address.bytes[0] = o1;
_address.bytes[1] = o2;
_address.bytes[2] = o3;
_address.bytes[3] = o4;
_address.bytes[4] = o5;
_address.bytes[5] = o6;
_address.bytes[6] = o7;
_address.bytes[7] = o8;
_address.bytes[8] = o9;
_address.bytes[9] = o10;
_address.bytes[10] = o11;
_address.bytes[11] = o12;
_address.bytes[12] = o13;
_address.bytes[13] = o14;
_address.bytes[14] = o15;
_address.bytes[15] = o16;
}

IPAddress::IPAddress(uint32_t address)
{
_address.dword = address;
// IPv4 only
_type = IPv4;
memset(_address.bytes, 0, sizeof(_address.bytes));
_address.dword[IPADDRESS_V4_DWORD_INDEX] = address;

// NOTE on conversion/comparison and uint32_t:
// These conversions are host platform dependent.
// There is a defined integer representation of IPv4 addresses,
// based on network byte order (will be the value on big endian systems),
// e.g. http://2398766798 is the same as http://142.250.70.206,
// However on little endian systems the octets 0x83, 0xFA, 0x46, 0xCE,
// in that order, will form the integer (uint32_t) 3460758158 .
}

IPAddress::IPAddress(const uint8_t *address) : IPAddress(IPv4, address) {}

IPAddress::IPAddress(IPType ip_type, const uint8_t *address)
{
_type = ip_type;
if (ip_type == IPv4) {
memset(_address.bytes, 0, sizeof(_address.bytes));
memcpy(&_address.bytes[IPADDRESS_V4_BYTES_INDEX], address, sizeof(uint32_t));
} else {
memcpy(_address.bytes, address, sizeof(_address.bytes));
}
}

IPAddress::IPAddress(const uint8_t *address)
IPAddress::IPAddress(const char *address)
{
memcpy(_address.bytes, address, sizeof(_address.bytes));
fromString(address);
}

IPAddress& IPAddress::operator=(const uint8_t *address)
{
memcpy(_address.bytes, address, sizeof(_address.bytes));
// IPv4 only conversion from byte pointer
_type = IPv4;
memset(_address.bytes, 0, sizeof(_address.bytes));
memcpy(&_address.bytes[IPADDRESS_V4_BYTES_INDEX], address, sizeof(uint32_t));
return *this;
}

IPAddress& IPAddress::operator=(const char *address)
{
fromString(address);
return *this;
}

IPAddress& IPAddress::operator=(uint32_t address)
{
_address.dword = address;
// IPv4 conversion
// See note on conversion/comparison and uint32_t
_type = IPv4;
memset(_address.bytes, 0, sizeof(_address.bytes));
_address.dword[IPADDRESS_V4_DWORD_INDEX] = address;
return *this;
}

bool IPAddress::operator==(const IPAddress& addr) const
{
return (addr._type == _type)
&& (memcmp(addr._address.bytes, _address.bytes, sizeof(_address.bytes)) == 0);
}

bool IPAddress::operator==(const uint8_t* addr) const
{
return memcmp(addr, _address.bytes, sizeof(_address.bytes)) == 0;
// IPv4 only comparison to byte pointer
// Can't support IPv6 as we know our type, but not the length of the pointer
return _type == IPv4 && memcmp(addr, &_address.bytes[IPADDRESS_V4_BYTES_INDEX], sizeof(uint32_t)) == 0;
}

uint8_t IPAddress::operator[](int index) const {
if (_type == IPv4) {
return _address.bytes[IPADDRESS_V4_BYTES_INDEX + index];
}
return _address.bytes[index];
}

uint8_t& IPAddress::operator[](int index) {
if (_type == IPv4) {
return _address.bytes[IPADDRESS_V4_BYTES_INDEX + index];
}
return _address.bytes[index];
}

size_t IPAddress::printTo(Print& p) const
{
size_t n = 0;
for(int i = 0; i < 3; i++) {
n += p.print(_address.bytes[i], DEC);

if (_type == IPv6) {
// IPv6 IETF canonical format: compress left-most longest run of two or more zero fields, lower case
int8_t longest_start = -1;
int8_t longest_length = 1;
int8_t current_start = -1;
int8_t current_length = 0;
for (int8_t f = 0; f < 8; f++) {
if (_address.bytes[f * 2] == 0 && _address.bytes[f * 2 + 1] == 0) {
if (current_start == -1) {
current_start = f;
current_length = 1;
} else {
current_length++;
}
if (current_length > longest_length) {
longest_start = current_start;
longest_length = current_length;
}
} else {
current_start = -1;
}
}
for (int f = 0; f < 8; f++) {
if (f < longest_start || f >= longest_start + longest_length) {
uint8_t c1 = _address.bytes[f * 2] >> 4;
uint8_t c2 = _address.bytes[f * 2] & 0xf;
uint8_t c3 = _address.bytes[f * 2 + 1] >> 4;
uint8_t c4 = _address.bytes[f * 2 + 1] & 0xf;
if (c1 > 0) {
n += p.print((char)(c1 < 10 ? '0' + c1 : 'a' + c1 - 10));
}
if (c1 > 0 || c2 > 0) {
n += p.print((char)(c2 < 10 ? '0' + c2 : 'a' + c2 - 10));
}
if (c1 > 0 || c2 > 0 || c3 > 0) {
n += p.print((char)(c3 < 10 ? '0' + c3 : 'a' + c3 - 10));
}
n += p.print((char)(c4 < 10 ? '0' + c4 : 'a' + c4 - 10));
if (f < 7) {
n += p.print(':');
}
} else if (f == longest_start) {
if (longest_start == 0) {
n += p.print(':');
}
n += p.print(':');
}
}
return n;
}

// IPv4
for (int i =0; i < 3; i++)
{
n += p.print(_address.bytes[IPADDRESS_V4_BYTES_INDEX + i], DEC);
n += p.print('.');
}
n += p.print(_address.bytes[3], DEC);
n += p.print(_address.bytes[IPADDRESS_V4_BYTES_INDEX + 3], DEC);
return n;
}

String IPAddress::toString() const
String IPAddress::toString4() const
{
char szRet[16];
sprintf(szRet,"%u.%u.%u.%u", _address.bytes[0], _address.bytes[1], _address.bytes[2], _address.bytes[3]);
snprintf(szRet, sizeof(szRet), "%u.%u.%u.%u", _address.bytes[IPADDRESS_V4_BYTES_INDEX], _address.bytes[IPADDRESS_V4_BYTES_INDEX + 1], _address.bytes[IPADDRESS_V4_BYTES_INDEX + 2], _address.bytes[IPADDRESS_V4_BYTES_INDEX + 3]);
return String(szRet);
}

String IPAddress::toString6() const
{
StreamString s;
s.reserve(40);
printTo(s);
return s;
}

String IPAddress::toString() const
{
if (_type == IPv4) {
return toString4();
} else {
return toString6();
}
}

bool IPAddress::fromString(const char *address)
{
if (!fromString4(address))
{
return fromString6(address);
}
return true;
}

bool IPAddress::fromString4(const char *address)
{
// TODO: add support for "a", "a.b", "a.b.c" formats

uint16_t acc = 0; // Accumulator
int16_t acc = -1; // Accumulator
uint8_t dots = 0;

memset(_address.bytes, 0, sizeof(_address.bytes));
while (*address)
{
char c = *address++;
if (c >= '0' && c <= '9')
{
acc = acc * 10 + (c - '0');
acc = (acc < 0) ? (c - '0') : acc * 10 + (c - '0');
if (acc > 255) {
// Value out of [0..255] range
return false;
Expand All @@ -100,11 +266,15 @@ bool IPAddress::fromString(const char *address)
else if (c == '.')
{
if (dots == 3) {
// Too much dots (there must be 3 dots)
// Too many dots (there must be 3 dots)
return false;
}
_address.bytes[dots++] = acc;
acc = 0;
if (acc < 0) {
/* No value between dots, e.g. '1..' */
return false;
}
_address.bytes[IPADDRESS_V4_BYTES_INDEX + dots++] = acc;
acc = -1;
}
else
{
Expand All @@ -117,7 +287,80 @@ bool IPAddress::fromString(const char *address)
// Too few dots (there must be 3 dots)
return false;
}
_address.bytes[3] = acc;
if (acc < 0) {
/* No value between dots, e.g. '1..' */
return false;
}
_address.bytes[IPADDRESS_V4_BYTES_INDEX + 3] = acc;
_type = IPv4;
return true;
}

bool IPAddress::fromString6(const char *address) {
uint32_t acc = 0; // Accumulator
int colons = 0, double_colons = -1;

while (*address)
{
char c = tolower(*address++);
if (isalnum(c) && c <= 'f') {
if (c >= 'a')
c -= 'a' - '0' - 10;
acc = acc * 16 + (c - '0');
if (acc > 0xffff)
// Value out of range
return false;
}
else if (c == ':') {
if (*address == ':') {
if (double_colons >= 0) {
// :: allowed once
return false;
}
if (*address != '\0' && *(address + 1) == ':') {
// ::: not allowed
return false;
}
// remember location
double_colons = colons + !!acc;
address++;
} else if (*address == '\0') {
// can't end with a single colon
return false;
}
if (colons == 7)
// too many separators
return false;
_address.bytes[colons * 2] = acc >> 8;
_address.bytes[colons * 2 + 1] = acc & 0xff;
colons++;
acc = 0;
}
else
// Invalid char
return false;
}

if (double_colons == -1 && colons != 7) {
// Too few separators
return false;
}
if (double_colons > -1 && colons > 6) {
// Too many segments (double colon must be at least one zero field)
return false;
}
_address.bytes[colons * 2] = acc >> 8;
_address.bytes[colons * 2 + 1] = acc & 0xff;
colons++;

if (double_colons != -1) {
for (int i = colons * 2 - double_colons * 2 - 1; i >= 0; i--)
_address.bytes[16 - colons * 2 + double_colons * 2 + i] = _address.bytes[double_colons * 2 + i];
for (int i = double_colons * 2; i < 16 - colons * 2 + double_colons * 2; i++)
_address.bytes[i] = 0;
}

_type = IPv6;
return true;
}

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