uspace/lib/c/generic/inet/addr.c

   1 /*
   2  * Copyright (c) 2013 Jiri Svoboda
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup libc
  30  * @{
  31  */
  32 /** @file Internet address parsing and formatting.
  33  */
  34
  35 #include <errno.h>
  36 #include <inet/addr.h>
  37 #include <stdio.h>
  38
  39 /** Parse network address.
  40  *
  41  * @param text  Network address in CIDR notation (a.b.c.d/w)
  42  * @param naddr Place to store network address
  43  *
  44  * @return      EOK on success, EINVAL if input is not in valid format
  45  */
  46 int inet_naddr_parse(const char *text, inet_naddr_t *naddr)
  47 {
  48         unsigned long a[4], bits;
  49         char *cp = (char *)text;
  50         int i;
  51
  52         for (i = 0; i < 3; i++) {
  53                 a[i] = strtoul(cp, &cp, 10);
  54                 if (*cp != '.')
  55                         return EINVAL;
  56                 ++cp;
  57         }
  58
  59         a[3] = strtoul(cp, &cp, 10);
  60         if (*cp != '/')
  61                 return EINVAL;
  62         ++cp;
  63
  64         bits = strtoul(cp, &cp, 10);
  65         if (*cp != '\0')
  66                 return EINVAL;
  67
  68         naddr->ipv4 = 0;
  69         for (i = 0; i < 4; i++) {
  70                 if (a[i] > 255)
  71                         return EINVAL;
  72                 naddr->ipv4 = (naddr->ipv4 << 8) | a[i];
  73         }
  74
  75         if (bits > 31)
  76                 return EINVAL;
  77
  78         naddr->bits = bits;
  79         return EOK;
  80 }
  81
  82 /** Parse node address.
  83  *
  84  * @param text  Network address in dot notation (a.b.c.d)
  85  * @param addr  Place to store node address
  86  *
  87  * @return      EOK on success, EINVAL if input is not in valid format
  88  */
  89 int inet_addr_parse(const char *text, inet_addr_t *addr)
  90 {
  91         unsigned long a[4];
  92         char *cp = (char *)text;
  93         int i;
  94
  95         for (i = 0; i < 3; i++) {
  96                 a[i] = strtoul(cp, &cp, 10);
  97                 if (*cp != '.')
  98                         return EINVAL;
  99                 ++cp;
 100         }
 101
 102         a[3] = strtoul(cp, &cp, 10);
 103         if (*cp != '\0')
 104                 return EINVAL;
 105
 106         addr->ipv4 = 0;
 107         for (i = 0; i < 4; i++) {
 108                 if (a[i] > 255)
 109                         return EINVAL;
 110                 addr->ipv4 = (addr->ipv4 << 8) | a[i];
 111         }
 112
 113         return EOK;
 114 }
 115
 116 /** Format network address.
 117  *
 118  * @param naddr Network address
 119  * @param bufp  Place to store pointer to formatted string (CIDR notation)
 120  *
 121  * @return      EOK on success, ENOMEM if out of memory.
 122  */
 123 int inet_naddr_format(inet_naddr_t *naddr, char **bufp)
 124 {
 125         int rc;
 126
 127         rc = asprintf(bufp, "%d.%d.%d.%d/%d", naddr->ipv4 >> 24,
 128             (naddr->ipv4 >> 16) & 0xff, (naddr->ipv4 >> 8) & 0xff,
 129             naddr->ipv4 & 0xff, naddr->bits);
 130
 131         if (rc < 0)
 132                 return ENOMEM;
 133
 134         return EOK;
 135 }
 136
 137 /** Format node address.
 138  *
 139  * @param addr  Node address
 140  * @param bufp  Place to store pointer to formatted string (dot notation)
 141  *
 142  * @return      EOK on success, ENOMEM if out of memory.
 143  */
 144 int inet_addr_format(inet_addr_t *addr, char **bufp)
 145 {
 146         int rc;
 147
 148         rc = asprintf(bufp, "%d.%d.%d.%d", addr->ipv4 >> 24,
 149             (addr->ipv4 >> 16) & 0xff, (addr->ipv4 >> 8) & 0xff,
 150             addr->ipv4 & 0xff);
 151
 152         if (rc < 0)
 153                 return ENOMEM;
 154
 155         return EOK;
 156 }
 157
 158 /** @}
 159  */