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vports.c

/***********************************************************************

RADIUS
Remote Authentication Dial In User Service

Lucent Technologies Remote Access
4464 Willow Road
Pleasanton, CA   94588

Copyright 1992-1999 Lucent Technologies Inc.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

   * Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.

   * 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.

   * All advertising materials mentioning features or use of this
     software must display the following acknowledgement:

        This product includes software developed by Lucent
        Technologies and its contributors.

   * Neither the name of the copyright holder 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 copyright holders 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 copyright
holder 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.

************************************************************************/


static char sccsid[] =
"$Id: vports.c,v 1.2 1999/06/23 23:40:45 cdr Exp $ Copyright 1998-1999 Lucent Technologies Inc.";

#include    <sys/types.h>
#include    <sys/stat.h>
#include    <sys/socket.h>
#include    <sys/time.h>
#include    <sys/file.h>
#include    <netinet/in.h>
#include    <stdio.h>
#include    <netdb.h>
#include    <pwd.h>
#include    <time.h>
#include    <ctype.h>
#include    <unistd.h>
#include    <signal.h>
#include    <errno.h>
#include    <sys/wait.h>
#include    <string.h>
#include    "radius.h"

#ifdef VPORTS
#include    "vports.h"

extern char *radius_dir;
extern void rad_exit();

int
vports_init()
{
      FILE  *f1;
      char  s[256], s2[16];
      int   max;
      int   fclose();
      u_char      cid[16];

      sprintf(s, "%s/%s", radius_dir, RADIUS_VPORTS);
      f1 = fopen(s, "rt");
      if (f1 != NULL) {
            DEBUG("Found VPORTS, reading in list\n");
            while(fgets(s, 256, f1) != NULL) {
                  s[strlen(s)-1] = '\0';  /* Strip off CR */
                  sscanf(s, "%s %s", cid, s2);
                  max = atoi(s2);
                  create_cidlist(cid, max);
            }
            fclose(f1);
            return 1;
      }
      return 0;
}

VP_CALLED *
begin_cidlist()
{
      if ((cidfirst = malloc(sizeof(VP_CALLED))) == NULL) {
            log_err("begin_cidlist: Could not allocate memory!\n");
            rad_exit(-1);
      }
      cidfirst->next = NULL;
      cidfirst->prev = NULL;
      cidlast = cidfirst;
      vp_cidinit = VP_LIST_INIT;
      return (VP_CALLED *)cidfirst;
}

VP_CALLED  *
new_cidlist()
{
      VP_CALLED *cidcur;

      if (vp_cidinit != VP_LIST_INIT) {
            cidcur = begin_cidlist();
            strcpy(cidcur->num, "");
            cidcur->max = 0;
            cidcur->nasipinit = 0;
            return (VP_CALLED *)cidcur;
      }
      if ((cidcur = malloc(sizeof(VP_CALLED))) == NULL) {
            log_err("new_cidlist: Could not allocate memory!\n");
            rad_exit(-1);
      }
      cidcur->next = NULL;
      cidcur->prev = cidlast;
      cidlast->next = cidcur;
      cidlast = cidcur;
      strcpy(cidcur->num, "");
      cidcur->max = 0;
      cidcur->nasipinit = 0;
      return (VP_CALLED *)cidcur;
}

VP_CALLED *
get_cidlist(num)
u_char *num;
{
      VP_CALLED *cidcur;

      cidcur = cidfirst;
      while(cidcur != NULL) {
            if (!strcmp((char *)cidcur->num, (char *)num)) {
                  return (VP_CALLED *)cidcur;
            }
            cidcur = cidcur->next;
      }
      return (VP_CALLED *)NULL;
}

void
create_cidlist(num, max)
u_char *num;
int max;
{
      VP_CALLED *cidcur;

      if ((cidcur = get_cidlist(num)) != NULL) {
            /* Woops!  Duplicate, reset Log a warning here maybe? */
            cidcur->max = max;
            return;
      }
      cidcur = new_cidlist();
      strcpy((char *)cidcur->num, (char *)num);
      cidcur->max = max;
      return;
}

int
vports_in_use(cidcur)
VP_CALLED *cidcur;
{
      VP_NAS      *nasip_cur;
      VP_ACCTID   *acctid_cur;
      u_int       ret;

      ret = 0;
      if (cidcur->nasipinit == VP_LIST_INIT) {
            nasip_cur = cidcur->nasip_first;
            while(nasip_cur != NULL) {
                  if (nasip_cur->acctidinit == VP_LIST_INIT) {
                        acctid_cur = nasip_cur->acctid_first;
                        while(acctid_cur != NULL) {
                              ret++;
                              acctid_cur = acctid_cur->next;
                        }
                  }
                  nasip_cur = nasip_cur->next;
            }
      }
      return ret;
}

int
vports_in_cache(cidcur)
VP_CALLED *cidcur;
{
      VP_CALLCACHE      *cc_cur;
      u_int             ret;
      time_t                  now;
      time_t                  time();

      ret = 0;
      time(&now);
      if (cidcur->callcacheinit == VP_LIST_INIT) {
            cc_cur = cidcur->cc_first;
            while(cc_cur != NULL) {
                  if (now >= (cc_cur->tm + VP_CACHE_EXPIRE)) {
                        free_single_cclist(cidcur, cc_cur);
                        cc_cur = cidcur->cc_first;
                        continue;
                  }
                  cc_cur = cc_cur->next;
            }
            cc_cur = cidcur->cc_first;
            while(cc_cur != NULL) {
                  ret++;
                  cc_cur = cc_cur->next;
            }
      }
      return ret;
}
            
VP_NAS *
begin_nasiplist(cidcur)
VP_CALLED *cidcur;
{
      if ((cidcur->nasip_first = malloc(sizeof(VP_NAS))) == NULL) {
            log_err("begin_nasiplist: Could not allocate memory!\n");
            rad_exit(-1);
      }
      cidcur->nasip_first->next = NULL;
      cidcur->nasip_first->prev = NULL;
      cidcur->nasip_first->addr = 0;
      cidcur->nasip_first->acctidinit = 0;
      cidcur->nasip_last = cidcur->nasip_first;
      cidcur->nasipinit = VP_LIST_INIT;
      return (VP_NAS *)cidcur->nasip_first;
}

void
free_single_nasiplist(cidcur,nasip_cur)
VP_CALLED *cidcur;
VP_NAS *nasip_cur;
{
      VP_NAS            *next, *prev;
      VP_ACCTID   *acctid_cur;

      if (nasip_cur->acctidinit == VP_LIST_INIT) {
            acctid_cur = nasip_cur->acctid_first;
            while(nasip_cur->acctid_first != NULL) {
                  free_single_acctidlist(nasip_cur, nasip_cur->acctid_first);
            }
            nasip_cur->acctidinit = 0;
      }
      next = nasip_cur->next;
      prev = nasip_cur->prev;
      if (next != NULL) {
            next->prev = prev;
      }
      if (prev != NULL) {
            prev->next = next;
      }
      if (cidcur->nasip_first == nasip_cur) {
            cidcur->nasip_first = next;
      }
      if (cidcur->nasip_last == nasip_cur) {
            cidcur->nasip_last = prev;
      }
      free(nasip_cur);
      if (cidcur->nasip_first == NULL && cidcur->nasip_last == NULL) {
            cidcur->nasipinit = 0;
      }
      return;
}

VP_NAS *
get_nasiplist(cidcur, addr)
VP_CALLED *cidcur;
UINT4 addr;
{
      VP_NAS      *nasip_cur;

      if (cidcur->nasipinit != VP_LIST_INIT) {
            return (VP_NAS *)NULL;
      }
      nasip_cur = cidcur->nasip_first;
      while(nasip_cur != NULL && nasip_cur->addr != addr) {
            nasip_cur = nasip_cur->next; 
      } 
      return nasip_cur;
}

VP_NAS *
new_nasiplist(cidcur, addr)
VP_CALLED *cidcur;
UINT4 addr;
{
      VP_NAS      *nasip_cur;

      if ((nasip_cur = get_nasiplist(cidcur, addr)) != NULL) {
            return (VP_NAS *)nasip_cur;
      }
      if (cidcur->nasipinit != VP_LIST_INIT) {
            nasip_cur = begin_nasiplist(cidcur);
            nasip_cur->addr = addr;
            nasip_cur->acctidinit = 0;
            return (VP_NAS *)nasip_cur;
      }
      if ((nasip_cur = malloc(sizeof(VP_NAS))) == NULL) {
            log_err("new_nasiplist: Could not allocate memory!\n");
            rad_exit(-1);
      }
      nasip_cur->next = NULL;
      nasip_cur->prev = cidcur->nasip_last;
      nasip_cur->addr = addr;
      nasip_cur->acctidinit = 0;
      if (cidcur->nasip_last != NULL)
            cidcur->nasip_last->next = nasip_cur;
      cidcur->nasip_last = nasip_cur;
      return (VP_NAS *)nasip_cur;
}

VP_CALLCACHE *
begin_cclist(cidcur)
VP_CALLED *cidcur;
{
      if ((cidcur->cc_first = malloc(sizeof(VP_CALLCACHE))) == NULL) {
            log_err("begin_cclist: Could not allocate memory!\n");
            rad_exit(-1);
      }
      cidcur->cc_first->next = NULL;
      cidcur->cc_first->prev = NULL;
      cidcur->cc_first->tm = 0;
      cidcur->cc_last = cidcur->cc_first;
      cidcur->callcacheinit = VP_LIST_INIT;
      return (VP_CALLCACHE *)cidcur->cc_first;
}

void
free_single_cclist(cidcur, cc_cur)
VP_CALLED *cidcur;
VP_CALLCACHE *cc_cur;
{
      VP_CALLCACHE      *next, *prev;

      next = cc_cur->next;
      prev = cc_cur->prev;
      if (next != NULL)
            next->prev = prev;
      if (prev != NULL)
            prev->next = next;
      if (cidcur->cc_first == cc_cur)
            cidcur->cc_first = next;
      if (cidcur->cc_last == cc_cur)
            cidcur->cc_last = prev;
      free(cc_cur);
      if (cidcur->cc_first == NULL && cidcur->cc_last == NULL)
            cidcur->callcacheinit = 0;
      return;
}

VP_CALLCACHE *
new_cclist(cidcur)
VP_CALLED *cidcur;
{
      VP_CALLCACHE      *cc_cur;
      time_t            time();

      if (cidcur->callcacheinit != VP_LIST_INIT) {
            cc_cur = begin_cclist(cidcur);
            time(&cc_cur->tm);
            return (VP_CALLCACHE *)cc_cur;
      }
      if ((cc_cur = malloc(sizeof(VP_CALLCACHE))) == NULL) {
            log_err("new_cclist: Could not allocate memory!\n");
            rad_exit(-1);
      }
      cc_cur->next = NULL;
      cc_cur->prev = cidcur->cc_last;
      time(&cc_cur->tm);
      if (cidcur->cc_last != NULL)
            cidcur->cc_last->next = cc_cur;
      cidcur->cc_last = cc_cur;
      return (VP_CALLCACHE *)cc_cur;
}

VP_ACCTID *
begin_acctidlist(nasip_cur)
VP_NAS *nasip_cur;
{
      if ((nasip_cur->acctid_first = malloc(sizeof(VP_ACCTID))) == NULL) {
            log_err("begin_acctidlist: Could not allocate memory!\n");
            rad_exit(-1);
      }
      nasip_cur->acctid_first->next = NULL;
      nasip_cur->acctid_first->prev = NULL;
      strcpy(nasip_cur->acctid_first->acctid, "");
      nasip_cur->acctid_last = nasip_cur->acctid_first;
      nasip_cur->acctidinit = VP_LIST_INIT;
      return (VP_ACCTID *)nasip_cur->acctid_first;
}

void
free_single_acctidlist(nasip_cur, acctid_cur)
VP_NAS *nasip_cur;
VP_ACCTID *acctid_cur;
{
      VP_ACCTID   *next, *prev;

      next = acctid_cur->next;
      prev = acctid_cur->prev;
      if (next != NULL)
            next->prev = prev;
      if (prev != NULL)
            prev->next = next;
      if (nasip_cur->acctid_first == acctid_cur)
            nasip_cur->acctid_first = next;
      if (nasip_cur->acctid_last == acctid_cur)
            nasip_cur->acctid_last = prev;
      free(acctid_cur);
      if (nasip_cur->acctid_first == NULL && nasip_cur->acctid_last == NULL)
            nasip_cur->acctidinit = 0;
      return;
}

VP_ACCTID *
get_acctidlist(nasip_cur, acctid)
VP_NAS *nasip_cur;
u_char *acctid;
{
      VP_ACCTID   *acctid_cur;

      if (nasip_cur->acctidinit != VP_LIST_INIT)
            return (VP_ACCTID *)NULL;
      acctid_cur = nasip_cur->acctid_first;
      while(acctid_cur != NULL) {
            if (!strcmp((char *)acctid_cur->acctid, (char *)acctid))
                  return (VP_ACCTID *)acctid_cur;
            acctid_cur = acctid_cur->next;
      }
      return (VP_ACCTID *)NULL;
}

VP_ACCTID *
new_acctidlist(nasip_cur, acctid)
VP_NAS *nasip_cur;
u_char *acctid;
{
      VP_ACCTID   *acctid_cur;

      if ((acctid_cur = get_acctidlist(nasip_cur, acctid)) != NULL) {
            /* How did this happen???? */
            return (VP_ACCTID *)acctid_cur;
      }
      if (nasip_cur->acctidinit != VP_LIST_INIT) {
            acctid_cur = begin_acctidlist(nasip_cur);
            strcpy(acctid_cur->acctid, (char *)acctid);
            return (VP_ACCTID *)acctid_cur;
      }
      if ((acctid_cur = malloc(sizeof(VP_ACCTID))) == NULL) {
            log_err("new_acctidlist: Could not allocate memory!\n");
            rad_exit(-1);
      }
      acctid_cur->next = NULL;
      acctid_cur->prev = nasip_cur->acctid_last;
      strcpy(acctid_cur->acctid, (char *)acctid);
      if (nasip_cur->acctid_last != NULL)
            nasip_cur->acctid_last->next = acctid_cur;
      nasip_cur->acctid_last = acctid_cur;
      return (VP_ACCTID *)acctid_cur;
}

int
vp_check_req(authreq)
AUTH_REQ *authreq;
{
      VALUE_PAIR        *vp;
      VP_CALLED         *cidcur;
      UINT4             addr;
      u_char                  called_sid[16];
      int               required;
      int               in_use;
      int               service_type = 0;

      required = 0;

      vp = authreq->request;
      while(vp != NULL) {
            switch(vp->attribute) {
                  case PW_USER_SERVICE_TYPE:
                        required++;
                        service_type = vp->lvalue;
                        break;

                  case PW_CLIENT_ID:
                        required++;
                        addr = vp->lvalue;
                        break;

                  case PW_CALLED:
                        required++;
                        strcpy((char *)called_sid, vp->strvalue);
                        break;
            }
            vp = vp->next;
      }
      if (required != 3)
            return VP_RET_IGNORE;
      if (service_type != PW_CALL_CHECK_USER
          && service_type != PW_OLD_CALL_CHECK_USER)
            return VP_RET_IGNORE;
      cidcur = get_cidlist(called_sid);
      if (cidcur == NULL)
            return VP_RET_IGNORE;
      in_use = vports_in_use(cidcur) + vports_in_cache(cidcur);
      if (in_use >= cidcur->max)
      {
            DEBUG("VPORTS: Rejecting Request, no ports available in pool %s [%d inuse, %d cached, %d max]\n",
                        cidcur->num, vports_in_use(cidcur),
                        vports_in_cache(cidcur), cidcur->max);
            return VP_RET_REJECT;
      }
      else
      {
            new_cclist(cidcur);
            DEBUG("VPORTS: Accepting Request to Virtual Pool %s [%d inuse, %d cached, %d max]\n",
                        cidcur->num, vports_in_use(cidcur),
                        vports_in_cache(cidcur), cidcur->max);
            return VP_RET_ACCEPT;
      }
}

void
vp_update_cid(authreq)
AUTH_REQ *authreq;
{
      VALUE_PAIR        *vp;
      VP_CALLED         *cidcur;
      VP_NAS                  *nasip_cur;
      VP_ACCTID         *acctid_cur;
      UINT4             addr = 0;
      char              *ipaddr2strp();
      u_char                  called_sid[16];
      u_char                  acct_id[16];
      u_char                  reboot_req;
      u_char                  required;
      u_int             record_type = 0;

      reboot_req = 0;
      required = 0;

      vp = authreq->request;
      while(vp != NULL) {
            switch(vp->attribute) {
            case PW_USER_NAME:
                  if (strcmp(vp->strvalue, ""))
                        reboot_req++;
                  break;

            case PW_CLIENT_ID:
                  required++;
                  addr = vp->lvalue;
                  break;

            case PW_ACCT_STATUS_TYPE:
                  required++;
                  record_type = vp->lvalue;
                  if (record_type == PW_STATUS_STOP)
                        reboot_req++;
                  break;

            case PW_ACCT_SESSION_ID:
                  required++;
                  strcpy((char *)acct_id, vp->strvalue);
                  break;

            case PW_CALLED:
                  required++;
                  strcpy((char *)called_sid, vp->strvalue);
                  break;
            }
            vp = vp->next;
      }
      if (required != 4)
            return;
      if (reboot_req == 0) {
            DEBUG("vports: NAS %s rebooted - clearing ports\n",
                  ipaddr2strp(addr));
            cidcur = cidfirst;
            while(cidcur != NULL) {
                  nasip_cur = get_nasiplist(cidcur, addr);
                  if (nasip_cur != NULL) {
                        free_single_nasiplist(cidcur, nasip_cur);
                  }
                  cidcur = cidcur->next;
            }
            return;
      }
      cidcur = get_cidlist(called_sid);
      if (cidcur == NULL) {
            return;
      }

      switch(record_type) {
      case PW_STATUS_START:
            if (vports_in_cache(cidcur) > 0) {
                  free_single_cclist(cidcur, cidcur->cc_first);
            }
            nasip_cur = new_nasiplist(cidcur, addr);
            acctid_cur = new_acctidlist(nasip_cur, acct_id);
            DEBUG("VPORTS: Added Session ID %s to the %s pool [%d inuse, %d cached, %d max]\n",
            acct_id, called_sid, vports_in_use(cidcur),
            vports_in_cache(cidcur), cidcur->max);
            break;

      case PW_STATUS_STOP:
            nasip_cur = get_nasiplist(cidcur, addr);
            if (nasip_cur != NULL) {
                  acctid_cur = get_acctidlist(nasip_cur, acct_id);
                  if (acctid_cur != NULL)
                  {
                        free_single_acctidlist(nasip_cur, acctid_cur);
                        DEBUG("VPORTS: Removed Session ID %s from the %s pool [%d inuse, %d cached, %d max]\n",
                        acct_id, called_sid, vports_in_use(cidcur),
                        vports_in_cache(cidcur), cidcur->max);
                  }
            }
            break;
      default:
            break;
      }

      return;
}

#endif /* VPORTS */

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