2010/6/15 Klaus Darilion <klaus.mailingli...@pernau.at>:
> What about IPv6 addresses?
IPv6 addresses must me converted to in6_addr struct prior to match
them, as there can be different representations for the same IPv6
address.
For example, take a look to this code:
/**
* Convert an IPv6 address as hexadecimal without ":" separator (32 characters)
* into in6_addr structure.
*
* \return Returns 0 on failure, or 1 on error.
*/
int hex2ipv6(const char *text, struct in6_addr *ip)
{
#ifdef LINUX
# define READ(text, index) sscanf((text), "%08" SCNx32, (uint32_t *)
&ip->s6_addr32[index])
#else
# define READ(text, index) sscanf((text), "%08" SCNx32, (uint32_t *)
&ip->__u6_addr.__u6_addr32[index])
#endif
/* Copy text */
char copy[33];
if (strlen(text) != 32)
return 0;
SECURE_STRNCPY(copy, text, sizeof(copy));
if (READ(copy + 8 * 3, 3) != 1)
return 0;
copy[8 * 3] = 0;
if (READ(copy + 8 * 2, 2) != 1)
return 0;
copy[8 * 2] = 0;
if (READ(copy + 8 * 1, 1) != 1)
return 0;
copy[8] = 0;
if (READ(copy + 8 * 0, 0) != 1)
return 0;
return 1;
#undef READ
}
/**
* Compare two IPv6 addresses.
*
* \return 1 on equality, 0 otherwise.
*/
int ipv6_equal(const struct in6_addr *ipa, const struct in6_addr *ipb)
{
return memcmp(ipa, ipb, sizeof(struct in6_addr)) == 0;
}
Extracted from here:
http://software.inl.fr/trac/browser/mirror/edenwall/nufw/trunk/nufw/src/libs/nubase/ipv6.c?rev=9107
--
Iñaki Baz Castillo
<i...@aliax.net>
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