inet.c

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/*
 * Copyright (c) 2009 Lukas Mejdrech
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <net/socket_codes.h>
#include <net/in.h>
#include <net/in6.h>
#include <net/inet.h>

#include <errno.h>
#include <mem.h>
#include <stdio.h>
#include <str.h>

int
inet_ntop(uint16_t family, const uint8_t *data, char *address, size_t length)
{
        if ((!data) || (!address))
                return EINVAL;

        switch (family) {
        case AF_INET:
                /* Check output buffer size */
                if (length < INET_ADDRSTRLEN)
                        return ENOMEM;
                        
                /* Fill buffer with IPv4 address */
                snprintf(address, length, "%hhu.%hhu.%hhu.%hhu",
                    data[0], data[1], data[2], data[3]);

                return EOK;

        case AF_INET6:
                /* Check output buffer size */
                if (length < INET6_ADDRSTRLEN)
                        return ENOMEM;
                
                /* Fill buffer with IPv6 address */
                snprintf(address, length,
                    "%hhx%hhx:%hhx%hhx:%hhx%hhx:%hhx%hhx:%hhx%hhx:%hhx%hhx:"
                    "%hhx%hhx:%hhx%hhx",
                    data[0], data[1], data[2], data[3], data[4], data[5],
                    data[6], data[7], data[8], data[9], data[10], data[11],
                    data[12], data[13], data[14], data[15]);
                
                return EOK;

        default:
                return ENOTSUP;
        }
}

int inet_pton(uint16_t family, const char *address, uint8_t *data)
{
        int base;
        size_t bytes;
        int count;

        const char *next;
        char *last;
        int index;
        size_t shift;
        unsigned long value;

        if (!data)
                return EINVAL;

        /* Set processing parameters */
        switch (family) {
        case AF_INET:
                count = 4;
                base = 10;
                bytes = 1;
                break;

        case AF_INET6:
                count = 16;
                base = 16;
                bytes = 4;
                break;

        default:
                return ENOTSUP;
        }

        /* Erase if no address */
        if (!address) {
                bzero(data, count);
                return ENOENT;
        }

        /* Process string from the beginning */
        next = address;
        index = 0;
        do {
                /* If the actual character is set */
                if (next && *next) {

                        /* If not on the first character */
                        if (index) {
                                /* Move to the next character */
                                ++next;
                        }

                        /* Parse the actual integral value */
                        value = strtoul(next, &last, base);
                        /*
                         * Remember the last problematic character
                         * should be either '.' or ':' but is ignored to be
                         * more generic
                         */
                        next = last;

                        /* Fill the address data byte by byte */
                        shift = bytes - 1;
                        do {
                                /* like little endian */
                                data[index + shift] = value;
                                value >>= 8;
                        } while(shift --);

                        index += bytes;
                } else {
                        /* Erase the rest of the address */
                        bzero(data + index, count - index);
                        return EOK;
                }
        } while (index < count);

        return EOK;
}

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