sources/network/ipaddress.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <netinet/in.h>
#include <netdb.h>
#include "ipaddress.h"

const IPAddress localhost (0x7F000001, 0);
bool IPAddress::sink;

// -----------------------------------------------------------------------------
//
IPAddress::IPAddress() :
	host (0),
	port (0) {}

// -----------------------------------------------------------------------------
//
IPAddress::IPAddress (unsigned long host, unsigned short port) :
	host (host),
	port (port) {}

// -----------------------------------------------------------------------------
//
IPAddress::IPAddress (const IPAddress& other) :
	host (other.host),
	port (other.port) {}

// -----------------------------------------------------------------------------
//
METHOD
IPAddress::to_string (WithPort withport) const -> String
{
	String val;

	if (withport == IP_WITH_PORT)
		val.sprintf ("%u.%u.%u.%u:%u", octet (0), octet (1), octet (2), octet (3), port);
	else
		val.sprintf ("%u.%u.%u.%u", octet (0), octet (1), octet (2), octet (3));

	return val;
}

// -----------------------------------------------------------------------------
//
METHOD
IPAddress::octet (int n) const -> unsigned char
{
	return (host >> ((3 - n) * 8)) & 0xFF;
}

// -----------------------------------------------------------------------------
//
METHOD
IPAddress::set_octet (int n, unsigned char oct) -> void
{
	// TODO: make a big-endian version
	host &= ~(0xFF << (3 - n) * 8);
	host |= oct << ((3 - n) * 8);
}

// -----------------------------------------------------------------------------
//
METHOD
IPAddress::compare (const IPAddress& other) const -> bool
{
	for (int i = 0; i < 4; ++i)
	{
		if (octet (i) != other.octet (i))
			return false;
	}

	if (port != 0
		and other.port != 0
		and port != other.port)
	{
		return false;
	}

	return true;
}

// -----------------------------------------------------------------------------
//
METHOD
IPAddress::operator< (const IPAddress& other) const -> bool
{
	for (int i = 0; i < 4; ++i)
	{
		if (octet (i) != other.octet (i))
			return octet (i) < other.octet (i);
	}

	return port < other.port;
}

// -----------------------------------------------------------------------------
//
METHOD
IPAddress::to_sockaddr_in() const -> sockaddr_in
{
	sockaddr_in claddr;
	memset (&claddr, 0, sizeof claddr);
	claddr.sin_addr.s_addr = htonl (host);
	claddr.sin_port = htons (port);
	claddr.sin_family = AF_INET;
	return claddr;
}

// -----------------------------------------------------------------------------
//
STATIC METHOD
IPAddress::from_string (String input, bool* ok) -> IPAddress
{
	unsigned int parts[4];
	int colonpos = input.find (":");
	String addressString = colonpos == -1 ? input : input.mid (0, colonpos);
	IPAddress value;

	// Try scanf the IPv4 host first. If it's not an IP string, it could
	// be a hostname; thus try resolve it.
	if (sscanf (addressString, "%u.%u.%u.%u", &parts[0], &parts[1], &parts[2], &parts[3]))
	{
		for (short i = 0; i < 4; ++i)
			value.set_octet (i, parts[i]);
	}
	else
	{
		// try resolve it
		return IPAddress::resolve (addressString, ok);
	}

	if (colonpos != -1)
		value.port = atoi (input.mid (colonpos + 1, -1));

	return value;
}

// -----------------------------------------------------------------------------
//
STATIC METHOD
IPAddress::resolve (String node, bool* ok) -> IPAddress
{
	struct addrinfo hints;
	struct addrinfo* lookup;
	int errorcode;
	memset (&hints, 0, sizeof hints);
	hints.ai_family = AF_INET;

	if ((errorcode = getaddrinfo (node, nullptr, &hints, &lookup)) != 0)
	{
		*ok = false;
		return IPAddress();
	}

	IPAddress result;
	assert (lookup != nullptr);
	sockaddr_in* addr = reinterpret_cast<struct sockaddr_in*> (lookup[0].ai_addr);
	result.host = ntohl (addr->sin_addr.s_addr);
	result.port = ntohs (addr->sin_port);
	freeaddrinfo (lookup);
	*ok = true;
	return result;
}