path: root/stacks/lwip_stack/lwip_src/common/stackx_ip_addr.c

/*
*
* Copyright (c) 2018 Huawei Technologies Co.,Ltd.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

#include <stdint.h>
#include <stddef.h>
#include "stackx_ip_addr.h"
#include "nstack_log.h"
#include "spl_def.h"

/* Here for now until needed in other places in stackx*/
#ifndef isprint
#define in_range(c, lo, up) ((u8)c >= lo && (u8)c <= up)
#define isprint(c) in_range(c, 0x20, 0x7f)
#define isdigit(c) in_range(c, '0', '9')
#define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))
#define islower(c) in_range(c, 'a', 'z')
#define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
#endif

/**
 * Ascii internet address interpretation routine.
 * The value returned is in network order.
 *
 * @param cp IPaddress in ascii represenation (e.g. "127.0.0.1")
 * @return ipaddress in network order
 */
u32 spl_ipaddr_addr(const char *cp)
{
    spl_ip_addr_t val;

    if (spl_ipaddr_aton(cp, &val))
    {
        return ip4_addr_get_u32(&val);
    }

    return (SPL_IPADDR_NONE);
}

/**
 * Check whether "cp" is a valid ascii representation
 * of an Internet address and convert to a binary address.
 * Returns 1 if the address is valid, 0 if not.
 * This replaces inet_addr, the return value from which
 * cannot distinguish between failure and a local broad cast address.
 *
 * @param cp IPaddress in ascii represenation (e.g. "127.0.0.1")
 * @param addr pointer to which to save the ipaddress in network order
 * @return 1 if cp could be converted to addr, 0 on failure
 */
int spl_ipaddr_aton(const char *cp, spl_ip_addr_t * addr)
{
    u32 val;
    u8 base;
    char c;
    u32 parts[4];
    u32 *pp = parts;

    if (cp == NULL)
    {
        return 0;
    }

    c = *cp;
    for (;;)
    {
        /*
         * Get number up to ``.''.
         * Values are specified as for C:
         * 0x=hex, 0=octal, 1-9=decimal.
         */
        if (!isdigit(c))
        {
            return (0);
        }

        val = 0;
        base = 10;
        if (c == '0')
        {
            c = *++cp;
            if ((c == 'x') || (c == 'X'))
            {
                base = 16;
                c = *++cp;
            }
            else
            {
                base = 8;
            }
        }

        for (;;)
        {
            if (isdigit(c))
            {
                val = (val * base) + (int) (c - '0');
                c = *++cp;
            }
            else if ((base == 16) && isxdigit(c))
            {
                val = (val << 4) | (int) (c + 10 - (islower(c) ? 'a' : 'A'));
                c = *++cp;
            }
            else
            {
                break;
            }
        }

        if (c == '.')
        {
            /*
             * Internet format:
             *  a.b.c.d
             *  a.b.c   (with c treated as 16 bits)
             *  a.b (with b treated as 24 bits)
             */
            if (pp >= parts + 3)
            {
                return (0);
            }

            *pp++ = val;
            c = *++cp;
        }
        else
        {
            break;
        }
    }

    /*
     * Check for trailing characters.
     */
    if ((c != '\0') && !isspace(c))
    {
        return (0);
    }

    /*
     * Concoct the address according to
     * the number of parts specified.
     */
    switch (pp - parts + 1)
    {
        case 0:
            return (0);         /* initial nondigit */

        case 1:                /* a -- 32 bits */
            break;

        case 2:                /* a.b -- 8.24 bits */
            if (val > 0xffffffUL)
            {
                return (0);
            }

            val |= parts[0] << 24;
            break;

        case 3:                /* a.b.c -- 8.8.16 bits */
            if (val > 0xffff)
            {
                return (0);
            }

            val |= (parts[0] << 24) | (parts[1] << 16);
            break;

        case 4:                /* a.b.c.d -- 8.8.8.8 bits */
            if (val > 0xff)
            {
                return (0);
            }

            val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
            break;
        default:
            NSPOL_LOGERR("unhandled");

            return (0);
    }

    if (addr)
    {
        ip4_addr_set_u32(addr, spl_htonl(val));
    }

    return (1);
}

/**
 * Convert numeric IPaddress into decimal dotted ASCII representation.
 * returns ptr to static buffer; not reentrant!
 *
 * @param addr ipaddress in network order to convert
 * @return pointer to a global static (!) buffer that holds the ASCII
 *         represenation of addr
 */
char *spl_ipaddr_ntoa(const spl_ip_addr_t * addr)
{
    static char str[16];

    return spl_ipaddr_ntoa_r(addr, str, 16);
}

/**
 * Same as spl_ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
 *
 * @param addr ipaddress in network order to convert
 * @param buf target buffer where the string is stored
 * @param buflen length of buf
 * @return either pointer to buf which now holds the ASCII
 *         representation of addr or NULL if buf was too small
 */
char *spl_ipaddr_ntoa_r(const spl_ip_addr_t * addr, char *buf, int buflen)
{
    u32 s_addr;
    char inv[3];
    char *rp;
    u8 *ap;
    u8 rem;
    u8 n;
    u8 i;
    int len = 0;

    s_addr = ip4_addr_get_u32(addr);

    rp = buf;
    ap = (u8 *) & s_addr;
    for (n = 0; n < 4; n++)
    {
        i = 0;
        do
        {
            rem = *ap % (u8) 10;
            *ap /= (u8) 10;
            inv[i++] = '0' + rem;
        }
        while (*ap);

        while (i--)
        {
            if (len++ >= buflen)
            {
                return NULL;
            }

            *rp++ = inv[i];
        }

        if (len++ >= buflen)
        {
            return NULL;
        }

        *rp++ = '.';
        ap++;
    }

    *--rp = 0;
    return buf;
}