/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
   It is considered beerware. Prost. Skol. Cheers or whatever.

   $id$ */

#ifndef OT_IP_H__
#define OT_IP_H__

#include <stddef.h>
#include <string.h>

#include "trackerlogic.h"

/* opentracker holds every address as sixteen bytes, writing IPv4 as the v4
   mapped form of RFC 4291 section 2.5.5.2. */
extern const char ip_v4mapped_prefix[12];

static inline int ip_is_v4mapped(const void *ip) { return !memcmp(ip, ip_v4mapped_prefix, sizeof(ip_v4mapped_prefix)); }

/* Read an address and return how many characters it took, or zero if src
   does not start with one. A plain IPv4 address is accepted and stored in
   its v4 mapped form.

   The count lets the caller carry on where the address ended, which is how
   "address:port" and "address/bits" are read. */
size_t ip_scan(const char *src, ot_ip6 ip);

/* Write an address and return how many characters it took. Nothing is
   terminated, so a caller may keep appending. A v4 mapped address is written
   as the plain dotted quad rather than "::ffff:1.2.3.4".  */
size_t ip_format(char *dest, const ot_ip6 ip);

#endif