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#ifndef IP_H
#define IP_H
/*
* Revision 20200603, Erwin Hoffmann
* - added V46loopback address
* Revision 20190414, Erwin Hoffmann
* - removed ip_scan and ip_scanbracket (comp. versions).
* - added ia6_fmt and ia4_fmt (for qmail)
* Revision 20180314, Erwin Hoffmann
* - ip4_cidr added and argument list changed (also for ip6_cidr)
* Revision 20180213, Erwin Hoffmann
* - ip4_scan/ip6_scan/ip4_scanbracket/ip6_fmt_flat revised
* Revision 20180206, Erwin Hoffmann
* - added V6linklocal address
* Revision 20170319, Kai Peter
* - rewrite (consolidation and compatibility)
* Revision 20170210, Kai Peter
* - added definition 'V4loopback' and redefinition 'ip4loopback'
* Revision 20170908, Erwin Hoffmann
* - added some definitions from s/qmail + required for djbdns
*/
/* Consolidated header files ip.h from *qmail (with IPv6) and ip4.h/ip6.h
from libowfat. Thus it could be used with 'older' and 'newer' code.
*/
#include "byte.h"
#include "stralloc.h"
#define V4MAPPREFIX "::ffff:"
#define HOSTNAMELEN 1025
#define IP4MLMTU 512
#define IP6MLMTU 1280 /* RFC 8200 */
#define MTUSIZE IP6MLMTU
#define IP4_FMT 20 /* backwards compatibility */
#define IP6_FMT 40 /* " */
#define IPFMT 72 /* used in qmail-remote only (temp?) */
/* may be better: */
//#define IP4_FMT IPFMT /* backwards compatibility */
//#define IP6_FMT IPFMT /* " */
/* deprecated: */
#define FMT_IP4 IP4_FMT /* more backwards compatibility */
#define FMT_IP6 IP6_FMT /* " */
/* these structs are going deprecated (should replaced by socket lib) */
struct ip4_address { unsigned char d[4]; }; /* 4 decimal pieces */
struct ip6_address { unsigned char d[16]; }; /* 16 hex pieces */
#define ip_address ip4_address /* backward compatibility */
unsigned int ip4_bytestring(stralloc *,char [4],int);
unsigned int ip4_cidr(char *,char [4],unsigned long *);
unsigned int ip4_fmt(char *,char [4]);
unsigned int ip4_scan(const char *,char [4]);
unsigned int ip4_scanbracket(const char *,char [4]);
unsigned int ia4_fmt(char *,char [4]);
const static char V4loopback[4] = {127,0,0,1};
const static char V4localnet[4] = {0,0,0,0};
const static char V4broadcast[4] = {-1,-1,-1,-1}; // all bits 1
/***
* Compactified IPv6 addresses are really ugly to parse.
* Syntax: (h = hex digit) [RFC 5952]
* 1. hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh
* 2. leading 0s in any octet can be suppressed
* 3. any number of 0000 may be abbreviated as "::"
* a) but only once;
* b) the longest piece or on equal match the first piece,
* c) a single instance of 0000 has to displayed as 0
* 4. The last two words may be written as IPv4 address
*
* Flat ip6 address syntax:
* hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh (32 hex digits)
*
* struct ip6_address format:
* cccccccccccccccc (16 chars; d[16]) -- each char swallows two hex values
*
* Bitstring representation with length prefix:
* bbbbbbb.........bbbb (max 128 bits); stralloc(ip6string); b = 0 || 1
*
*/
unsigned int ip6_bytestring(stralloc *,char *,int);
unsigned int ip6_cidr(char *,char [16],unsigned long *);
unsigned int ip6_fmt(char *,char [16]);
unsigned int ip6_fmt_flat(char *,char [16]);
unsigned int ip6_ifscan(char *,char [16],stralloc *);
unsigned int ip6_scan(const char *,char [16]);
unsigned int ip6_scanbracket(const char *,char [16]);
unsigned int ip6_scan_flat(const char *,char [16]);
unsigned int ia6_fmt(char *,char [16]);
static const unsigned char V4mappedprefix[12] = {0,0,0,0, 0,0,0,0, 0,0,0xff,0xff};
static const unsigned char V46loopback[16] = {0,0,0,0, 0,0,0,0, 0,0,0xff,0xff, 127,0,0,1};
static const unsigned char V6loopback[16] = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,1};
static const unsigned char V6localnet[16] = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0};
static const unsigned char V6linklocal[2] = {0xfe,0x80};
int fromhex(unsigned char);
char tohex(char);
#define V6any V6localnet /* backward compatibility */
#define ip6_isv4mapped(ip) (byte_equal(ip,12,V4mappedprefix))
#endif
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