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Initial revision

/*
 * (c) 2008 Florian Westphal <fw@strlen.de>, public domain.
 */

#ifndef NG_IPADDR_HDR
#define NG_IPADDR_HDR

#include "portab.h"

/**
 * @file
 * Functions for AF_ agnostic ipv4/ipv6 handling (header).
 */

#include <assert.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>

#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#else
# define PF_INET AF_INET
#endif


#ifdef WANT_IPV6
#define NG_INET_ADDRSTRLEN	INET6_ADDRSTRLEN
#else
#define NG_INET_ADDRSTRLEN	16
#endif


#ifdef WANT_IPV6
typedef union {
	struct sockaddr sa;
	struct sockaddr_in sin4;
	struct sockaddr_in6 sin6;
} ng_ipaddr_t;
#else
/* assume compiler can't deal with typedef struct {... */
struct NG_IP_ADDR_DONTUSE {
	struct sockaddr_in sin4;
};
typedef struct NG_IP_ADDR_DONTUSE ng_ipaddr_t;
#endif


static inline int
ng_ipaddr_af(const ng_ipaddr_t *a)
{
	assert(a != NULL);
#ifdef WANT_IPV6
	return a->sa.sa_family;
#else
	assert(a->sin4.sin_family == 0 || a->sin4.sin_family == AF_INET);
	return a->sin4.sin_family;
#endif
}


static inline socklen_t
ng_ipaddr_salen(const ng_ipaddr_t *a)
{
	assert(a != NULL);
#ifdef WANT_IPV6
	assert(a->sa.sa_family == AF_INET || a->sa.sa_family == AF_INET6);
	if (a->sa.sa_family == AF_INET6)
		return (socklen_t)sizeof(a->sin6);
#endif
	assert(a->sin4.sin_family == AF_INET);
	return (socklen_t)sizeof(a->sin4);
}


static inline UINT16
ng_ipaddr_getport(const ng_ipaddr_t *a)
{
#ifdef WANT_IPV6
	int af = a->sa.sa_family;

	assert(a != NULL);
	assert(af == AF_INET || af == AF_INET6);

	if (af == AF_INET6)
		return ntohs(a->sin6.sin6_port);
#endif /* WANT_IPV6 */

	assert(a != NULL);
	assert(a->sin4.sin_family == AF_INET);
	return ntohs(a->sin4.sin_port);
}

/*
 * init a ng_ipaddr_t object.
 * @param addr: pointer to ng_ipaddr_t to initialize.
 * @param ip_str: ip address in dotted-decimal (ipv4) or hexadecimal (ipv6) notation
 * @param port: transport layer port number to use.
 */
GLOBAL bool ng_ipaddr_init PARAMS((ng_ipaddr_t *addr, const char *ip_str, UINT16 port));

/* set sin4/sin6_port, depending on a->sa_family */
GLOBAL void ng_ipaddr_setport PARAMS((ng_ipaddr_t *a, UINT16 port));

/* return true if a and b have the same IP address. If a and b have different AF, return false. */
GLOBAL bool ng_ipaddr_ipequal PARAMS((const ng_ipaddr_t *a, const ng_ipaddr_t *b));


#ifdef WANT_IPV6
/* convert struct sockaddr to string, returns pointer to static buffer */
GLOBAL const char *ng_ipaddr_tostr PARAMS((const ng_ipaddr_t *addr));

/* convert struct sockaddr to string. dest must be NG_INET_ADDRSTRLEN bytes long */
GLOBAL bool ng_ipaddr_tostr_r PARAMS((const ng_ipaddr_t *addr, char *dest));
#else
static inline const char*
ng_ipaddr_tostr(const ng_ipaddr_t *addr)
{
	assert(addr != NULL);
	return inet_ntoa(addr->sin4.sin_addr);
}

static inline bool
ng_ipaddr_tostr_r(const ng_ipaddr_t *addr, char *d)
{
	assert(addr != NULL);
	assert(d != NULL);
	strlcpy(d, inet_ntoa(addr->sin4.sin_addr), NG_INET_ADDRSTRLEN);
	return true;
}
#endif
#endif

/* -eof- */