/* Copyright 2008 Jozsef Kadlecsik (kadlec@blackhole.kfki.hu)
 *
 * This program is free software; you can redistribute it and/or modify   
 * it under the terms of the GNU General Public License as published by   
 * the Free Software Foundation; either version 2 of the License, or      
 * (at your option) any later version.                                    
 *                                                                         
 * This program is distributed in the hope that it will be useful,        
 * but WITHOUT ANY WARRANTY; without even the implied warranty of         
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          
 * GNU General Public License for more details.                           
 *                                                                         
 * You should have received a copy of the GNU General Public License      
 * along with this program; if not, write to the Free Software            
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <limits.h>			/* UINT_MAX */
#include <stdio.h>			/* *printf */
#include <string.h>			/* mem*, str* */

#include "ipset.h"

#include <linux/netfilter_ipv4/ip_set_ipportnethash.h>

#define OPT_CREATE_HASHSIZE	0x01U
#define OPT_CREATE_PROBES	0x02U
#define OPT_CREATE_RESIZE	0x04U
#define OPT_CREATE_NETWORK	0x08U
#define OPT_CREATE_FROM		0x10U
#define OPT_CREATE_TO		0x20U

/* Initialize the create. */
static void
create_init(void *data)
{
	struct ip_set_req_ipportnethash_create *mydata = data;

	DP("create INIT");

	/* Default create parameters */	
	mydata->hashsize = 1024;
	mydata->probes = 8;
	mydata->resize = 50;
}

/* Function which parses command options; returns true if it ate an option */
static int
create_parse(int c, char *argv[] UNUSED, void *data, unsigned *flags)
{
	struct ip_set_req_ipportnethash_create *mydata = data;
	ip_set_ip_t value;

	DP("create_parse");

	switch (c) {
	case '1':

		if (string_to_number(optarg, 1, UINT_MAX - 1, &mydata->hashsize))
			exit_error(PARAMETER_PROBLEM, "Invalid hashsize `%s' specified", optarg);

		*flags |= OPT_CREATE_HASHSIZE;

		DP("--hashsize %u", mydata->hashsize);
		
		break;

	case '2':

		if (string_to_number(optarg, 1, 65535, &value))
			exit_error(PARAMETER_PROBLEM, "Invalid probes `%s' specified", optarg);

		mydata->probes = value;
		*flags |= OPT_CREATE_PROBES;

		DP("--probes %u", mydata->probes);
		
		break;

	case '3':

		if (string_to_number(optarg, 0, 65535, &value))
			exit_error(PARAMETER_PROBLEM, "Invalid resize `%s' specified", optarg);

		mydata->resize = value;
		*flags |= OPT_CREATE_RESIZE;

		DP("--resize %u", mydata->resize);
		
		break;

	case '4':
		parse_ip(optarg, &mydata->from);

		*flags |= OPT_CREATE_FROM;

		DP("--from %x (%s)", mydata->from,
		   ip_tostring_numeric(mydata->from));

		break;

	case '5':
		parse_ip(optarg, &mydata->to);

		*flags |= OPT_CREATE_TO;

		DP("--to %x (%s)", mydata->to,
		   ip_tostring_numeric(mydata->to));

		break;

	case '6':
		parse_ipandmask(optarg, &mydata->from, &mydata->to);

		/* Make to the last of from + mask */
		if (mydata->to)
			mydata->to = mydata->from | ~(mydata->to);
		else {
			mydata->from = 0x00000000;
			mydata->to = 0xFFFFFFFF;
		}
		*flags |= OPT_CREATE_NETWORK;

		DP("--network from %x (%s)", 
		   mydata->from, ip_tostring_numeric(mydata->from));
		DP("--network to %x (%s)", 
		   mydata->to, ip_tostring_numeric(mydata->to));

		break;

	default:
		return 0;
	}

	return 1;
}

/* Final check; exit if not ok. */
static void
create_final(void *data, unsigned int flags)
{
	struct ip_set_req_ipportnethash_create *mydata = data;

#ifdef IPSET_DEBUG
	DP("hashsize %u probes %u resize %u",
	   mydata->hashsize, mydata->probes, mydata->resize);
#endif

	if (flags & OPT_CREATE_NETWORK) {
		/* --network */
		if ((flags & OPT_CREATE_FROM) || (flags & OPT_CREATE_TO))
			exit_error(PARAMETER_PROBLEM,
				   "Can't specify --from or --to with --network\n");
	} else if (flags & (OPT_CREATE_FROM | OPT_CREATE_TO)) {
		/* --from --to */
		if (!(flags & OPT_CREATE_FROM) || !(flags & OPT_CREATE_TO))
			exit_error(PARAMETER_PROBLEM,
				   "Need to specify both --from and --to\n");
	} else {
		exit_error(PARAMETER_PROBLEM,
			   "Need to specify --from and --to, or --network\n");

	}

	DP("from : %x to: %x diff: %x", 
	   mydata->from, mydata->to,
	   mydata->to - mydata->from);

	if (mydata->from > mydata->to)
		exit_error(PARAMETER_PROBLEM,
			   "From can't be higher than to.\n");

	if (mydata->to - mydata->from > MAX_RANGE)
		exit_error(PARAMETER_PROBLEM,
			   "Range too large. Max is %d IPs in range\n",
			   MAX_RANGE+1);
}

/* Create commandline options */
static const struct option create_opts[] = {
	{.name = "hashsize",	.has_arg = required_argument,	.val = '1'},
	{.name = "probes",	.has_arg = required_argument,	.val = '2'},
	{.name = "resize",	.has_arg = required_argument,	.val = '3'},
	{.name = "from",	.has_arg = required_argument,	.val = '4'},
	{.name = "to",		.has_arg = required_argument,	.val = '5'},
	{.name = "network",	.has_arg = required_argument,	.val = '6'},
	{NULL},
};

/* Add, del, test parser */
static ip_set_ip_t
adt_parser(int cmd, const char *arg, void *data)
{
	struct ip_set_req_ipportnethash *mydata = data;
	char *saved = ipset_strdup(arg);
	char *ptr, *tmp = saved;
	ip_set_ip_t cidr;

	DP("ipportnethash: %p %p", arg, data);

	if (((ptr = strchr(tmp, ':')) || (ptr = strchr(tmp, '%'))) && ++warn_once == 1)
		fprintf(stderr, "Warning: please use ',' separator token between ip,port,net.\n"
			        "Next release won't support old separator tokens.\n");

	ptr = strsep(&tmp, ":%,");
	parse_ip(ptr, &mydata->ip);
	if (!tmp)
		exit_error(PARAMETER_PROBLEM,
			   "IP address, port and network address must be specified: ip,port,net");

	ptr = strsep(&tmp, ":%,");
	parse_port(ptr, &mydata->port);
	if (!tmp)
		exit_error(PARAMETER_PROBLEM,
			   "IP address, port and network address must be specified: ip,port,net");

	ptr = strsep(&tmp, "/");
	if (tmp == NULL)
		if (cmd == CMD_TEST)
			cidr = 32;
		else
			exit_error(PARAMETER_PROBLEM,
				   "Missing /cidr from `%s'", arg);
	else
		if (string_to_number(tmp, 1, 31, &cidr))
			exit_error(PARAMETER_PROBLEM,
				   "Out of range cidr `%s' specified", arg);
	
	mydata->cidr = cidr;

	parse_ip(ptr, &mydata->ip1);
	ipset_free(saved);
	return 1;	
};

/*
 * Print and save
 */

static void
initheader(struct set *set, const void *data)
{
	const struct ip_set_req_ipportnethash_create *header = data;
	struct ip_set_ipportnethash *map = set->settype->header;

	memset(map, 0, sizeof(struct ip_set_ipportnethash));
	map->hashsize = header->hashsize;
	map->probes = header->probes;
	map->resize = header->resize;
	map->first_ip = header->from;
	map->last_ip = header->to;
}

static void
printheader(struct set *set, unsigned options)
{
	struct ip_set_ipportnethash *mysetdata = set->settype->header;

	printf(" from: %s", ip_tostring(mysetdata->first_ip, options));
	printf(" to: %s", ip_tostring(mysetdata->last_ip, options));
	printf(" hashsize: %u", mysetdata->hashsize);
	printf(" probes: %u", mysetdata->probes);
	printf(" resize: %u\n", mysetdata->resize);
}

static char buf[20];

static char *
unpack_ip_tostring(ip_set_ip_t ip, unsigned options UNUSED)
{
	int i, j = 3;
	unsigned char a, b;

	ip = htonl(ip);	
	for (i = 3; i >= 0; i--)
		if (((unsigned char *)&ip)[i] != 0) {
			j = i;
			break;
		}
			
	a = ((unsigned char *)&ip)[j];
	if (a <= 128) {
		a = (a - 1) * 2;
		b = 7;
	} else if (a <= 192) {
		a = (a - 129) * 4;
		b = 6;
	} else if (a <= 224) {
		a = (a - 193) * 8;
		b = 5;
	} else if (a <= 240) {
		a = (a - 225) * 16;
		b = 4;
	} else if (a <= 248) {
		a = (a - 241) * 32;
		b = 3;
	} else if (a <= 252) {
		a = (a - 249) * 64;
		b = 2;
	} else if (a <= 254) {
		a = (a - 253) * 128;
		b = 1;
	} else {
		a = b = 0;
	}
	((unsigned char *)&ip)[j] = a;
	b += j * 8;
	
	sprintf(buf, "%u.%u.%u.%u/%u",
		((unsigned char *)&ip)[0],
		((unsigned char *)&ip)[1],
		((unsigned char *)&ip)[2],
		((unsigned char *)&ip)[3],
		b);

	DP("%s %s", ip_tostring(ntohl(ip), 0), buf);
	return buf;
}

static void
printips(struct set *set, void *data, u_int32_t len, unsigned options)
{
	struct ip_set_ipportnethash *mysetdata = set->settype->header;
	size_t offset = 0;
	struct ipportip *ipptr;
	ip_set_ip_t ip;
	uint16_t port;

	while (offset < len) {
		ipptr = data + offset;
		if (ipptr->ip || ipptr->ip1) {
			ip = (ipptr->ip>>16) + mysetdata->first_ip;
			port = (uint16_t) ipptr->ip;
			printf("%s,%s,", 
			       ip_tostring(ip, options),
			       port_tostring(port, options));
			printf("%s\n", 
			       unpack_ip_tostring(ipptr->ip1, options));
		}
		offset += sizeof(struct ipportip);
	}
}

static void
saveheader(struct set *set, unsigned options)
{
	struct ip_set_ipportnethash *mysetdata = set->settype->header;

	printf("-N %s %s --from %s",
	       set->name, set->settype->typename,
	       ip_tostring(mysetdata->first_ip, options));
	printf(" --to %s",
	       ip_tostring(mysetdata->last_ip, options));
	printf(" --hashsize %u --probes %u --resize %u\n",
	       mysetdata->hashsize, mysetdata->probes, mysetdata->resize);
}

/* Print save for an IP */
static void
saveips(struct set *set, void *data, u_int32_t len, unsigned options)
{
	struct ip_set_ipportnethash *mysetdata = set->settype->header;
	size_t offset = 0;
	struct ipportip *ipptr;
	ip_set_ip_t ip;
	uint16_t port;

	while (offset < len) {
		ipptr = data + offset;
		if (ipptr) {
			ip = (ipptr->ip>>16) + mysetdata->first_ip;
			port = (uint16_t) ipptr->ip;
			printf("-A %s %s,%s,", set->name, 
			       ip_tostring(ip, options),
			       port_tostring(port, options));
			printf("%s\n",
			       unpack_ip_tostring(ipptr->ip, options));
		}
		offset += sizeof(struct ipportip);
	}
}

static void usage(void)
{
	printf
	    ("-N set ipportnethash --from IP --to IP\n"
	     "   [--hashsize hashsize] [--probes probes ] [--resize resize]\n"
	     "-N set ipportnethash --network IP/mask\n"
	     "   [--hashsize hashsize] [--probes probes ] [--resize resize]\n"
	     "-A set IP,port,IP/net\n"
	     "-D set IP,port,IP/net\n"
	     "-T set IP,port,IP[/net]\n");
}

static struct settype settype_ipportnethash = {
	.typename = SETTYPE_NAME,
	.protocol_version = IP_SET_PROTOCOL_VERSION,

	/* Create */
	.create_size = sizeof(struct ip_set_req_ipportnethash_create),
	.create_init = &create_init,
	.create_parse = &create_parse,
	.create_final = &create_final,
	.create_opts = create_opts,

	/* Add/del/test */
	.adt_size = sizeof(struct ip_set_req_ipportnethash),
	.adt_parser = &adt_parser,

	/* Printing */
	.header_size = sizeof(struct ip_set_ipportnethash),
	.initheader = &initheader,
	.printheader = &printheader,
	.printips = &printips,		/* We only have the unsorted version */
	.printips_sorted = &printips,
	.saveheader = &saveheader,
	.saveips = &saveips,
	
	.usage = &usage,
};

CONSTRUCTOR(ipportnethash)
{
	settype_register(&settype_ipportnethash);

}