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ipset_nethash.c

/* Copyright 2004 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 "ip_set_nethash.h"

#define BUFLEN 30;

#define OPT_CREATE_HASHSIZE   0x01U
#define OPT_CREATE_PROBES     0x02U
#define OPT_CREATE_RESIZE     0x04U

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

      DP("create INIT");

      /* Default create parameters */     
      mydata->hashsize = 1024;
      mydata->probes = 4;
      mydata->resize = 50;
}

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

      default:
            return 0;
      }

      return 1;
}

/* Final check; exit if not ok. */
static void
nethash_create_final(void *data UNUSED, unsigned int flags UNUSED)
{
}

/* 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'},
      {NULL},
};

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

      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->ip);
#if 0
      if (!mydata->ip)
            exit_error(PARAMETER_PROBLEM,
                    "Zero valued IP address `%s' specified", ptr);
#endif
      ipset_free(saved);

      return 1;   
};

/*
 * Print and save
 */

static void
nethash_initheader(struct set *set, const void *data)
{
      const struct ip_set_req_nethash_create *header = data;
      struct ip_set_nethash *map = set->settype->header;

      memset(map, 0, sizeof(struct ip_set_nethash));
      map->hashsize = header->hashsize;
      map->probes = header->probes;
      map->resize = header->resize;
}

static void
nethash_printheader(struct set *set, unsigned options UNUSED)
{
      struct ip_set_nethash *mysetdata = set->settype->header;

      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
nethash_printips(struct set *set UNUSED, void *data, u_int32_t len,
             unsigned options, char dont_align)
{
      size_t offset = 0;
      ip_set_ip_t *ip;

      while (offset < len) {
            ip = data + offset;
            printf("%s\n", unpack_ip_tostring(*ip, options));
            offset += IPSET_VALIGN(sizeof(ip_set_ip_t), dont_align);
      }
}

static void
nethash_saveheader(struct set *set, unsigned options UNUSED)
{
      struct ip_set_nethash *mysetdata = set->settype->header;

      printf("-N %s %s --hashsize %u --probes %u --resize %u\n",
             set->name, set->settype->typename,
             mysetdata->hashsize, mysetdata->probes, mysetdata->resize);
}

/* Print save for an IP */
static void
nethash_saveips(struct set *set UNUSED, void *data, u_int32_t len,
            unsigned options, char dont_align)
{
      size_t offset = 0;
      ip_set_ip_t *ip;

      while (offset < len) {
            ip = data + offset;
            printf("-A %s %s\n", set->name,
                   unpack_ip_tostring(*ip, options));
            offset += IPSET_VALIGN(sizeof(ip_set_ip_t), dont_align);
      }
}

static void
nethash_usage(void)
{
      printf
          ("-N set nethash [--hashsize hashsize] [--probes probes ]\n"
           "               [--resize resize]\n"
           "-A set IP/cidr\n"
           "-D set IP/cidr\n"
           "-T set IP/cidr\n");
}

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

      /* Create */
      .create_size = sizeof(struct ip_set_req_nethash_create),
      .create_init = nethash_create_init,
      .create_parse = nethash_create_parse,
      .create_final = nethash_create_final,
      .create_opts = create_opts,

      /* Add/del/test */
      .adt_size = sizeof(struct ip_set_req_nethash),
      .adt_parser = nethash_adt_parser,

      /* Printing */
      .header_size = sizeof(struct ip_set_nethash),
      .initheader = nethash_initheader,
      .printheader = nethash_printheader,
      .printips = nethash_printips,
      .printips_sorted = nethash_printips,
      .saveheader = nethash_saveheader,
      .saveips = nethash_saveips,
      
      .usage = nethash_usage,
};

CONSTRUCTOR(nethash)
{
      settype_register(&settype_nethash);

}

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