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#include "byte.h"
#include "fmt.h"
#include "dns.h"
/* RFC1886:
* 4321:0:1:2:3:4:567:89ab
* ->
* b.a.9.8.7.6.5.0.4.0.0.0.3.0.0.0.2.0.0.0.1.0.0.0.0.0.0.0.1.2.3.4.IP6.INT.
*/
static inline char tohex(char c) {
return c>=10?c-10+'a':c+'0';
}
int dns_name6_domain(char name[DNS_NAME6_DOMAIN],char ip[16])
{
unsigned int j;
for (j=0; j<16; j++) {
name[j*4]=1;
name[j*4+1]=tohex(ip[15-j] & 15);
name[j*4+2]=1;
name[j*4+3]=tohex((unsigned char)ip[15-j] >> 4);
}
byte_copy(name + 4*16,9,"\3ip6\3int\0");
return 4*16+9;
}