genode/repos/os/include/net/netaddress.h

/*
 * \brief  Generic network address definitions
 * \author Stefan Kalkowski
 * \date   2010-08-20
 */

/*
 * Copyright (C) 2010-2017 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU Affero General Public License version 3.
 */

#ifndef _NET__NETADDRESS_H_
#define _NET__NETADDRESS_H_

/* Genode */
#include <base/stdint.h>
#include <util/string.h>
#include <base/output.h>

namespace Net { template <unsigned, char, bool> class Network_address; }


/**
 * Generic form of a network address.
 */
template <unsigned LEN, char DELIM, bool HEX>
struct Net::Network_address
{
	Genode::uint8_t addr[LEN];


	/******************
	 ** Constructors **
	 ******************/

	Network_address(Genode::uint8_t value = 0) {
		Genode::memset(&addr, value, LEN); }

	Network_address(void *src) {
		Genode::memcpy(&addr, src, LEN); }


	/*********************
	 ** Helper methods  **
	 *********************/

	void copy(void *dst) { Genode::memcpy(dst, addr, LEN); }

	void print(Genode::Output &output) const
	{
		using namespace Genode;
		for (unsigned i = 0; i < LEN; i++) {
			if (!HEX) { Genode::print(output, (unsigned) addr[i]); }
			else { Genode::print(output, Hex(addr[i], Hex::OMIT_PREFIX, Hex::PAD)); }
			if (i < LEN - 1) output.out_char(DELIM);
		}
	}


	/***************
	 ** Operators **
	 ***************/

	bool operator==(const Network_address &other) const {

		/*
		 * We compare from lowest address segment to highest
		 * one, because in a local context, the higher segments
		 * of two addresses normally don't distinguish.
		 * (e.g. in an IPv4 local subnet)
		 */
		for (int i = LEN-1; i >= 0; --i) {
			if (addr[i] != other.addr[i])
				return false;
		}
		return true;
	}

	bool operator!=(const Network_address &other) const {
		return !(*this == other); }
}
__attribute__((packed));


namespace Genode {

	template <unsigned LEN, char DELIM, bool HEX>
	inline size_t ascii_to(char                            const *str,
	                       Net::Network_address<LEN, DELIM, HEX> &result)
	{
		Net::Network_address<LEN, DELIM, HEX> result_buf;
		size_t number_id = 0;
		size_t read_len  = 0;
		while (1) {

			/* read the current number */
			size_t number_len =
				ascii_to_unsigned(str, result_buf.addr[number_id],
				                  HEX ? 16 : 10);

			/* fail if there's no number */
			if (!number_len) {
				return 0; }

			/* update read length and number index */
			read_len += number_len;
			number_id++;

			/* if we have all numbers, fill result and return read length */
			if (number_id == LEN) {
				result = result_buf;
				return read_len;
			}
			/* there are numbers left, check for the delimiter */
			str += number_len;
			if (*str != DELIM) {
				return 0; }

			/* seek to next number */
			read_len++;
			str++;
		}
	}
}



#endif /* _NET__NETADDRESS_H_ */