/*
 * Socket6.xs
 * $Id: Socket6.xs,v 1.8 2000/05/27 07:44:14 ume Exp $
 *
 * Copyright (C) 2000 Hajimu UMEMOTO <ume@mahoroba.org>.
 * All rights reserved.
 *
 * This moduled is besed on perl5.005_55-v6-19990721 written by KAME
 * Project.
 *
 * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#ifdef __KAME__
# include <net/route.h>
# include <netinet6/ipsec.h>
#endif
#include <netdb.h>

#include "config.h"

#ifndef HAVE_GETADDRINFO
#include "getaddrinfo.c"
#define	NI_MAXHOST	1025
#define	NI_MAXSERV	32
#define HAVE_GETADDRINFO
#endif
#ifndef HAVE_GETNAMEINFO
#include "getnameinfo.c"
#define HAVE_GETNAMEINFO
#endif

#ifndef HAVE_PL_SV_UNDEF
#define PL_sv_undef	sv_undef
#endif

static int
not_here(char *s)
{
    croak("Socket6::%s not implemented on this architecture", s);
    return -1;
}

static double
constant(char *name, int arg)
{
    errno = 0;
    switch (*name) {
    case 'A':
	if (strEQ(name, "AF_INET6"))
#ifdef AF_INET6
	    return AF_INET6;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AI_ADDRCONFIG"))
#ifdef AI_ADDRCONFIG
	    return AI_ADDRCONFIG;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AI_ALL"))
#ifdef AI_ALL
	    return AI_ALL;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AI_CANONNAME"))
#ifdef AI_CANONNAME
	    return AI_CANONNAME;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AI_NUMERICHOST"))
#ifdef AI_NUMERICHOST
	    return AI_NUMERICHOST;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AI_DEFAULT"))
#ifdef AI_DEFAULT
	    return AI_DEFAULT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AI_MASK"))
#ifdef AI_MASK
	    return AI_MASK;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AI_PASSIVE"))
#ifdef AI_PASSIVE
	    return AI_PASSIVE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AI_V4MAPPED"))
#ifdef AI_V4MAPPED
	    return AI_V4MAPPED;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AI_V4MAPPED_CFG"))
#ifdef AI_V4MAPPED_CFG
	    return AI_V4MAPPED_CFG;
#else
	    goto not_there;
#endif
	break;
    case 'I':
	if (strEQ(name, "IP_AUTH_TRANS_LEVEL"))
#ifdef IP_AUTH_TRANS_LEVEL
	    return IP_AUTH_TRANS_LEVEL;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IP_AUTH_NETWORK_LEVEL"))
#ifdef IP_AUTH_NETWORK_LEVEL
	    return IP_AUTH_NETWORK_LEVEL;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IP_ESP_TRANS_LEVEL"))
#ifdef IP_ESP_TRANS_LEVEL
	    return IP_ESP_TRANS_LEVEL;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IP_EPS_NETWORK_LEVEL"))
#ifdef IP_EPS_NETWORK_LEVEL
	    return IP_EPS_NETWORK_LEVEL;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPPROTO_IP"))
#ifdef IPPROTO_IP
	    return IPPROTO_IP;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPPROTO_IPV6"))
#ifdef IPPROTO_IPV6
	    return IPPROTO_IPV6;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPSEC_LEVEL_AVAIL"))
#ifdef IPSEC_LEVEL_AVAIL
	    return IPSEC_LEVEL_AVAIL;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPSEC_LEVEL_BYPASS"))
#ifdef IPSEC_LEVEL_BYPASS
	    return IPSEC_LEVEL_BYPASS;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPSEC_LEVEL_DEFAULT"))
#ifdef IPSEC_LEVEL_DEFAULT
	    return IPSEC_LEVEL_DEFAULT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPSEC_LEVEL_NONE"))
#ifdef IPSEC_LEVEL_NONE
	    return IPSEC_LEVEL_NONE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPSEC_LEVEL_REQUIRE"))
#ifdef IPSEC_LEVEL_REQUIRE
	    return IPSEC_LEVEL_REQUIRE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPSEC_LEVEL_UNIQUE"))
#ifdef IPSEC_LEVEL_UNIQUE
	    return IPSEC_LEVEL_UNIQUE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPSEC_LEVEL_USE"))
#ifdef IPSEC_LEVEL_USE
	    return IPSEC_LEVEL_USE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPV6_AUTH_TRANS_LEVEL"))
#ifdef IPV6_AUTH_TRANS_LEVEL
	    return IPV6_AUTH_TRANS_LEVEL;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPV6_AUTH_NETWORK_LEVEL"))
#ifdef IPV6_AUTH_NETWORK_LEVEL
	    return IPV6_AUTH_NETWORK_LEVEL;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPV6_ESP_TRANS_LEVEL"))
#ifdef IPV6_ESP_TRANS_LEVEL
	    return IPV6_ESP_TRANS_LEVEL;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPV6_EPS_NETWORK_LEVEL"))
#ifdef IPV6_EPS_NETWORK_LEVEL
	    return IPV6_EPS_NETWORK_LEVEL;
#else
	    goto not_there;
#endif
	break;
    case 'N':
	if (strEQ(name, "NI_NOFQDN"))
#ifdef NI_NOFQDN
	    return NI_NOFQDN;
#else
	    goto not_there;
#endif
	if (strEQ(name, "NI_NUMERICHOST"))
#ifdef NI_NUMERICHOST
	    return NI_NUMERICHOST;
#else
	    goto not_there;
#endif
	if (strEQ(name, "NI_NAMEREQD"))
#ifdef NI_NAMEREQD
	    return NI_NAMEREQD;
#else
	    goto not_there;
#endif
	if (strEQ(name, "NI_NUMERICSERV"))
#ifdef NI_NUMERICSERV
	    return NI_NUMERICSERV;
#else
	    goto not_there;
#endif
	if (strEQ(name, "NI_DGRAM"))
#ifdef NI_DGRAM
	    return NI_DGRAM;
#else
	    goto not_there;
#endif
	if (strEQ(name, "NI_WITHSCOPEID"))
#ifdef NI_WITHSCOPEID
	    return NI_WITHSCOPEID;
#else
	    goto not_there;
#endif
 	break;
    case 'P':
	if (strEQ(name, "PF_INET6"))
#ifdef PF_INET6
	    return PF_INET6;
#else
	    goto not_there;
#endif
	break;
    }
    errno = EINVAL;
    return 0;

not_there:
    errno = ENOENT;
    return 0;
}


MODULE = Socket6	PACKAGE = Socket6

double
constant(name,arg)
	char *		name
	int		arg

void
gethostbyname2(host, af)
	char *	host;
	int	af;
	PPCODE:
{
#ifdef HAVE_GETHOSTBYNAME2
	struct hostent *phe;
	int count, i;

	if (phe = gethostbyname2(host, af)) {
		for (count = 0; phe->h_addr_list[count]; ++count);
		EXTEND(sp, 4 + count);
		PUSHs(sv_2mortal(newSVpv((char *) phe->h_name,
					 strlen(phe->h_name))));
		PUSHs(sv_2mortal(newSVpv((char *) phe->h_aliases,
					 sizeof(char *))));
		PUSHs(sv_2mortal(newSViv((IV) phe->h_addrtype)));
		PUSHs(sv_2mortal(newSViv((IV) phe->h_length)));
		for (i = 0; i < count; ++i) {
			PUSHs(sv_2mortal(newSVpv((char *)phe->h_addr_list[i],
						 phe->h_length)));
		}
	}
#else
	ST(0) = (SV *) not_here("gethostbyname2");
#endif
}

void
inet_pton(af, host)
	int	af
	char *	host
	CODE:
{
#ifdef HAVE_INET_PTON
	union {
#ifdef INET6_ADDRSTRLEN
		struct in6_addr addr6;
#endif
		struct in_addr addr4;
	} ip_address;
	int len;
	struct hostent * phe;
	int ok;

	if (phe = gethostbyname2(host, af)) {
		Copy( phe->h_addr, &ip_address, phe->h_length, char );
		len = phe->h_length;
		ok = 1;
	} else {
		switch (af) {
#ifdef INET6_ADDRSTRLEN
		case AF_INET6:
			len = sizeof(struct sockaddr_in6);
			break;
#endif
		case AF_INET:
			len = sizeof(struct sockaddr_in);
			break;
		default:
	    		croak("Bad address family for %s, got %d",
				"Socket6::inet_pton", af);
			break;
		}
		ok = inet_pton(af, host, &ip_address);
	}

	ST(0) = sv_newmortal();
	if (ok == 1) {
		sv_setpvn( ST(0), (char *)&ip_address, len );
	}
#else
	ST(0) = (SV *) not_here("inet_pton");
#endif
}

void
inet_ntop(af, address_sv)
	int	af
	SV *	address_sv
	CODE:
{
#ifdef HAVE_INET_NTOP
	STRLEN addrlen;
#ifdef INET6_ADDRSTRLEN
	struct in6_addr addr;
	char addr_str[INET6_ADDRSTRLEN];
#else
	struct in_addr addr;
	char addr_str[16];
#endif
	char * address = SvPV(address_sv,addrlen);
	int alen;

	switch (af) {
	case AF_INET:
		alen = sizeof(struct in_addr);
		break;
#ifdef INET6_ADDRSTRLEN
	case AF_INET6:
		alen = sizeof(struct in6_addr);
		break;
#endif
	default:
		croak("Unsupported address family for %s, af is %d",
		      "Socket6::inet_ntop", af);
	}

	/* with sanity check, just in case */
	if (alen > sizeof(addr) || alen != addrlen) {
		croak("Bad arg length for %s, length is %d, should be %d",
		      "Socket6::inet_ntop",
		      addrlen, alen);
	}

	Copy( address, &addr, sizeof addr, char );
	addr_str[0] = 0;
	inet_ntop(af, &addr, addr_str, sizeof addr_str);

	ST(0) = sv_2mortal(newSVpv(addr_str, strlen(addr_str)));
#else
	ST(0) = (SV *) not_here("inet_ntop");
#endif
}

void
pack_sockaddr_in6(port,ip6_address)
	unsigned short	port
	char *	ip6_address
	CODE:
{
#ifdef INET6_ADDRSTRLEN
	struct sockaddr_in6 sin;

	Zero( &sin, sizeof sin, char );
	sin.sin6_family = AF_INET6;
	sin.sin6_port = htons(port);
	Copy( ip6_address, &sin.sin6_addr, sizeof sin.sin6_addr, char );

	ST(0) = sv_2mortal(newSVpv((char *)&sin, sizeof sin));
#else
	ST(0) = (SV *) not_here("pack_sockaddr_in6");
#endif
}

void
pack_sockaddr_in6_all(port,flowinfo,ip6_address,scope_id)
	unsigned short	port
	unsigned long	flowinfo
	char *	ip6_address
	unsigned long	scope_id
	CODE:
{
#ifdef INET6_ADDRSTRLEN
	struct sockaddr_in6 sin;

	Zero( &sin, sizeof sin, char );
	sin.sin6_family = AF_INET6;
	sin.sin6_port = htons(port);
	sin.sin6_flowinfo = htonl(flowinfo);
	Copy( ip6_address, &sin.sin6_addr, sizeof sin.sin6_addr, char );
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
	sin.sin6_scope_id = htonl(scope_id);
#endif

	ST(0) = sv_2mortal(newSVpv((char *)&sin, sizeof sin));
#else
	ST(0) = (SV *) not_here("pack_sockaddr_in6_all");
#endif
}

void
unpack_sockaddr_in6(sin_sv)
	SV *	sin_sv
	PPCODE:
{
#ifdef INET6_ADDRSTRLEN
	STRLEN sockaddrlen;
	struct sockaddr_in6 addr;
	unsigned short	port;
	struct in6_addr	ip6_address;
	char *	sin = SvPV(sin_sv,sockaddrlen);
	if (sockaddrlen != sizeof(addr)) {
		croak("Bad arg length for %s, length is %d, should be %d",
		      "Socket6::unpack_sockaddr_in6",
		      sockaddrlen, sizeof(addr));
	}
	Copy( sin, &addr,sizeof addr, char );
	if ( addr.sin6_family != AF_INET6 ) {
		croak("Bad address family for %s, got %d, should be %d",
		      "Socket6::unpack_sockaddr_in6",
		      addr.sin6_family,
		      AF_INET6);
	} 
	port = ntohs(addr.sin6_port);
	ip6_address = addr.sin6_addr;

	EXTEND(sp, 2);
	PUSHs(sv_2mortal(newSViv((IV) port)));
	PUSHs(sv_2mortal(newSVpv((char *)&ip6_address,sizeof ip6_address)));
#else
	ST(0) = (SV *) not_here("unpack_sockaddr_in6");
#endif
}

void
unpack_sockaddr_in6_all(sin_sv)
	SV *	sin_sv
	PPCODE:
{
#ifdef INET6_ADDRSTRLEN
	STRLEN sockaddrlen;
	struct sockaddr_in6 addr;
	unsigned short	port;
	unsigned long	flowinfo;
	struct in6_addr	ip6_address;
	unsigned long	scope_id;
	char *	sin = SvPV(sin_sv,sockaddrlen);
	if (sockaddrlen != sizeof(addr)) {
		croak("Bad arg length for %s, length is %d, should be %d",
		      "Socket6::unpack_sockaddr_in6",
		      sockaddrlen, sizeof(addr));
	}
	Copy( sin, &addr,sizeof addr, char );
	if ( addr.sin6_family != AF_INET6 ) {
		croak("Bad address family for %s, got %d, should be %d",
		      "Socket6::unpack_sockaddr_in6",
		      addr.sin6_family,
		      AF_INET6);
	} 
	port = ntohs(addr.sin6_port);
	flowinfo = ntohl(addr.sin6_flowinfo);
	ip6_address = addr.sin6_addr;
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
	scope_id = ntohl(addr.sin6_scope_id);
#else
	scope_id = 0;
#endif

	EXTEND(sp, 5);
	PUSHs(sv_2mortal(newSViv((IV) port)));
	PUSHs(sv_2mortal(newSViv((IV) flowinfo)));
	PUSHs(sv_2mortal(newSVpv((char *)&ip6_address,sizeof ip6_address)));
	PUSHs(sv_2mortal(newSViv((IV) scope_id)));
#else
	ST(0) = (SV *) not_here("unpack_sockaddr_in6_all");
#endif
}

void
in6addr_any()
	CODE:
{
#ifdef INET6_ADDRSTRLEN
	ST(0) = sv_2mortal(newSVpv((char *)&in6addr_any, sizeof in6addr_any));
#else
	ST(0) = (SV *) not_here("in6addr_any");
#endif
}

void
in6addr_loopback()
	CODE:
{
#ifdef INET6_ADDRSTRLEN
	ST(0) = sv_2mortal(newSVpv((char *)&in6addr_loopback,
				   sizeof in6addr_loopback));
#else
	ST(0) = (SV *) not_here("in6addr_loopback");
#endif
}

void
getaddrinfo(host,port,family=0,socktype=0,protocol=0,flags=0)
	char *	host
	char *	port
	int	family
	int	socktype
	int	protocol
	int	flags
	PPCODE:
{
#ifdef HAVE_GETADDRINFO  
	struct addrinfo hints, * res;
	int	err;
	int	count;

	Zero( &hints, sizeof hints, char );
	hints.ai_flags = flags;
	hints.ai_family = family;
	hints.ai_socktype = socktype;
	hints.ai_protocol = protocol;
	err = getaddrinfo(*host ? host : 0, *port ? port : 0, &hints, &res);

	if (err == 0) {
		struct addrinfo * p;
		count = 0;
		for (p = res; p; p = p->ai_next)
			++count;
		EXTEND(sp, 5 * count);
		for (p = res; p; p = p->ai_next) {
			PUSHs(sv_2mortal(newSViv((IV) p->ai_family)));
			PUSHs(sv_2mortal(newSViv((IV) p->ai_socktype)));
			PUSHs(sv_2mortal(newSViv((IV) p->ai_protocol)));
			PUSHs(sv_2mortal(newSVpv((char *)p->ai_addr,
			      p->ai_addrlen)));
			if (p->ai_canonname)
				PUSHs(sv_2mortal(newSVpv((char *)p->ai_canonname,
				      strlen(p->ai_canonname))));
			else
				PUSHs(&PL_sv_undef);
		}
		freeaddrinfo(res);
	}
#else
	ST(0) = (SV *) not_here("getaddrinfo");
#endif
}

void
getnameinfo(sin_sv, flags = 0)
	SV *	sin_sv
	int flags;
	PPCODE:
{
#ifdef HAVE_GETNAMEINFO  
	STRLEN sockaddrlen;
	struct sockaddr * sin = (struct sockaddr *)SvPV(sin_sv,sockaddrlen);
	char host[NI_MAXHOST];
	char port[NI_MAXSERV];
	int	err;

	if (items < 2) {
		err = getnameinfo(sin, sockaddrlen, host, sizeof host,
				  port, sizeof port, 0);
		if (err)
			err = getnameinfo(sin, sockaddrlen, host, sizeof host,
					  port, sizeof port, NI_NUMERICSERV);
		if (err)
			err = getnameinfo(sin, sockaddrlen, host, sizeof host,
					  port, sizeof port, NI_NUMERICHOST);
		if (err)
			err = getnameinfo(sin, sockaddrlen, host, sizeof host,
					  port, sizeof port,
					  NI_NUMERICHOST|NI_NUMERICSERV);
	} else
		err = getnameinfo(sin, sockaddrlen, host, sizeof host,
				  port, sizeof port, flags);

	if (err == 0) {
		EXTEND(sp, 2);
		PUSHs(sv_2mortal(newSVpv(host, strlen(host))));
		PUSHs(sv_2mortal(newSVpv(port, strlen(port))));
	}
#else
	ST(0) = (SV *) not_here("getnameinfo");
#endif
}