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ipset_ipportnethash.c

/* 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 "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
ipportnethash_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
ipportnethash_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
ipportnethash_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
ipportnethash_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
ipportnethash_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
ipportnethash_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
ipportnethash_printips(struct set *set, void *data, u_int32_t len,
                   unsigned options, char dont_align)
{
      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;
            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 += IPSET_VALIGN(sizeof(struct ipportip), dont_align);
      }
}

static void
ipportnethash_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
ipportnethash_saveips(struct set *set, void *data, u_int32_t len,
                  unsigned options, char dont_align)
{
      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;
            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 += IPSET_VALIGN(sizeof(struct ipportip), dont_align);
      }
}

static void
ipportnethash_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 = ipportnethash_create_init,
      .create_parse = ipportnethash_create_parse,
      .create_final = ipportnethash_create_final,
      .create_opts = create_opts,

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

      /* Printing */
      .header_size = sizeof(struct ip_set_ipportnethash),
      .initheader = ipportnethash_initheader,
      .printheader = ipportnethash_printheader,
      .printips = ipportnethash_printips,
      .printips_sorted = ipportnethash_printips,
      .saveheader = ipportnethash_saveheader,
      .saveips = ipportnethash_saveips,
      
      .usage = ipportnethash_usage,
};

CONSTRUCTOR(ipportnethash)
{
      settype_register(&settype_ipportnethash);

}

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