source: mainline/uspace/lib/c/generic/net/inet.c@ 08bb73b

/*
 * 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 libc
 *  @{
 */

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

#include <net/socket_codes.h>
#include <net/in.h>
#include <net/in6.h>
#include <net/inet.h>
#include <inet/addr.h>
#include <errno.h>
#include <mem.h>
#include <stdio.h>
#include <str.h>

/** Prints the address into the character buffer.
 *
 *  @param[in] family   The address family.
 *  @param[in] data     The address data.
 *  @param[out] address The character buffer to be filled.
 *  @param[in] length   The buffer length.
 *  @return             EOK on success.
 *  @return             EINVAL if the data or address parameter is NULL.
 *  @return             ENOMEM if the character buffer is not long enough.
 *  @return             ENOTSUP if the address family is not supported.
 */
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;
        }
}

static int inet_pton4(const char *address, uint8_t *data)
{
        memset(data, 0, 4);
        
        const char *cur = address;
        size_t i = 0;
        
        while (i < 4) {
                int rc = str_uint8_t(cur, &cur, 10, false, &data[i]);
                if (rc != EOK)
                        return rc;
                
                i++;
                
                if (*cur == 0)
                        break;
                
                if (*cur != '.')
                        return EINVAL;
                
                if (i < 4)
                        cur++;
        }
        
        if ((i == 4) && (*cur != 0))
                return EINVAL;
        
        return EOK;
}

static int inet_pton6(const char *address, uint8_t *data)
{
        // FIXME TODO
        return ENOTSUP;
}

/** Parses the character string into the address.
 *
 * @param[in]  family  The address family.
 * @param[in]  address The character buffer to be parsed.
 * @param[out] data    The address data to be filled.
 *
 * @return EOK on success.
 * @return EINVAL if the data parameter is NULL.
 * @return ENOENT if the address parameter is NULL.
 * @return ENOTSUP if the address family is not supported.
 *
 */
int inet_pton(uint16_t family, const char *address, uint8_t *data)
{
        switch (family) {
        case AF_INET:
                return inet_pton4(address, data);
        case AF_INET6:
                return inet_pton6(address, data);
        default:
                /** Unknown address family */
                return ENOTSUP;
        }
}

/** @}
 */