source: mainline/uspace/srv/net/inet.c@ a64c64d

/*
 * 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.
 */

/** @addtogroup net
 *  @{
 */

/** @file
 *  Internet protocol address conversion functions implementation.
 */

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

#include "include/in.h"
#include "include/in6.h"
#include "include/inet.h"
#include "include/socket_codes.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 the output buffer size
                        if(length < INET_ADDRSTRLEN){
                                return ENOMEM;
                        }
                        // fill the buffer with the IPv4 address
                        snprintf(address, length, "%hhu.%hhu.%hhu.%hhu", data[0], data[1], data[2], data[3]);
                        return EOK;
                case AF_INET6:
                        // check the output buffer size
                        if(length < INET6_ADDRSTRLEN){
                                return ENOMEM;
                        }
                        // fill the buffer with the 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){
        /** The base number of the values.
         */
        int base;
        /** The number of bytes per a section.
         */
        size_t bytes;
        /** The number of bytes of the address data.
         */
        int count;

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

        if(! data){
                return EINVAL;
        }

        // set the 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 the 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;
}

/** @}
 */