source: mainline/uspace/lib/c/generic/inet/addr.c@ bf85e56

/*
 * Copyright (c) 2013 Jiri Svoboda
 * 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 address parsing and formatting.
 */

#include <errno.h>
#include <inet/addr.h>
#include <stdio.h>

/** Parse network address.
 *
 * @param text  Network address in CIDR notation (a.b.c.d/w)
 * @param naddr Place to store network address
 *
 * @return      EOK on success, EINVAL if input is not in valid format
 */
int inet_naddr_parse(const char *text, inet_naddr_t *naddr)
{
        unsigned long a[4], bits;
        char *cp = (char *)text;
        int i;

        for (i = 0; i < 3; i++) {
                a[i] = strtoul(cp, &cp, 10);
                if (*cp != '.')
                        return EINVAL;
                ++cp;
        }

        a[3] = strtoul(cp, &cp, 10);
        if (*cp != '/')
                return EINVAL;
        ++cp;

        bits = strtoul(cp, &cp, 10);
        if (*cp != '\0')
                return EINVAL;

        naddr->ipv4 = 0;
        for (i = 0; i < 4; i++) {
                if (a[i] > 255)
                        return EINVAL;
                naddr->ipv4 = (naddr->ipv4 << 8) | a[i];
        }

        if (bits > 31)
                return EINVAL;

        naddr->bits = bits;
        return EOK;
}

/** Parse node address.
 *
 * @param text  Network address in dot notation (a.b.c.d)
 * @param addr  Place to store node address
 *
 * @return      EOK on success, EINVAL if input is not in valid format
 */
int inet_addr_parse(const char *text, inet_addr_t *addr)
{
        unsigned long a[4];
        char *cp = (char *)text;
        int i;

        for (i = 0; i < 3; i++) {
                a[i] = strtoul(cp, &cp, 10);
                if (*cp != '.')
                        return EINVAL;
                ++cp;
        }

        a[3] = strtoul(cp, &cp, 10);
        if (*cp != '\0')
                return EINVAL;

        addr->ipv4 = 0;
        for (i = 0; i < 4; i++) {
                if (a[i] > 255)
                        return EINVAL;
                addr->ipv4 = (addr->ipv4 << 8) | a[i];
        }

        return EOK;
}

/** Format network address.
 *
 * @param naddr Network address
 * @param bufp  Place to store pointer to formatted string (CIDR notation)
 *
 * @return      EOK on success, ENOMEM if out of memory.
 */
int inet_naddr_format(inet_naddr_t *naddr, char **bufp)
{
        int rc;

        rc = asprintf(bufp, "%d.%d.%d.%d/%d", naddr->ipv4 >> 24,
            (naddr->ipv4 >> 16) & 0xff, (naddr->ipv4 >> 8) & 0xff,
            naddr->ipv4 & 0xff, naddr->bits);

        if (rc < 0)
                return ENOMEM;

        return EOK;
}

/** Format node address.
 *
 * @param addr  Node address
 * @param bufp  Place to store pointer to formatted string (dot notation)
 *
 * @return      EOK on success, ENOMEM if out of memory.
 */
int inet_addr_format(inet_addr_t *addr, char **bufp)
{
        int rc;

        rc = asprintf(bufp, "%d.%d.%d.%d", addr->ipv4 >> 24,
            (addr->ipv4 >> 16) & 0xff, (addr->ipv4 >> 8) & 0xff,
            addr->ipv4 & 0xff);

        if (rc < 0)
                return ENOMEM;

        return EOK;
}

/** @}
 */