/*

   ether.c - ethernet address entry lookup routines

   Parts of this file were part of the nss_ldap library (as ldap-ethers.c)

   which has been forked into the nss-pam-ldapd library.

   Copyright (C) 1997-2005 Luke Howard

   Copyright (C) 2006 West Consulting

   Copyright (C) 2006-2017 Arthur de Jong

   This library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   This library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with this library; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

   02110-1301 USA

*/

#include "config.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#ifdef HAVE_STDINT_H

#include <stdint.h>

#endif /* HAVE_STDINT_H */

#include "common.h"

#include "log.h"

#include "myldap.h"

#include "cfg.h"

#include "attmap.h"

#include "compat/ether.h"

/* ( nisSchema.2.11 NAME 'ieee802Device' SUP top AUXILIARY

 *   DESC 'A device with a MAC address; device SHOULD be

 *         used as a structural class'

 *   MAY macAddress )

 */

/* the search base for searches */

const char *ether_bases[NSS_LDAP_CONFIG_MAX_BASES] = { NULL };

/* the search scope for searches */

int ether_scope = LDAP_SCOPE_DEFAULT;

/* the basic search filter for searches */

const char *ether_filter = "(objectClass=ieee802Device)";

/* the attributes to request with searches */

const char *attmap_ether_cn         = "cn";

const char *attmap_ether_macAddress = "macAddress";

/* the attribute list to request with searches */

static const char *ether_attrs[3];

/* create a search filter for searching an ethernet address

   by name, return -1 on errors */

static int mkfilter_ether_byname(const char *name,

                                 char *buffer, size_t buflen)

{

  char safename[BUFLEN_HOSTNAME];

  /* escape attribute */

  if (myldap_escape(name, safename, sizeof(safename)))

  {

    log_log(LOG_ERR, "mkfilter_ether_byname(): safename buffer too small");

    return -1;

  }

  /* build filter */

  return mysnprintf(buffer, buflen, "(&%s(%s=%s))",

                    ether_filter, attmap_ether_cn, safename);

}

static void my_ether_ntoa(const uint8_t *addr, char *buffer, int compact)

{

  int i;

  for (i = 0; i < 6; i++)

  {

    if (i > 0)

      *buffer++ = ':';

    buffer += sprintf(buffer, compact ? "%x" : "%02x", addr[i]);

  }

  *buffer++ = '\0';

}

static int mkfilter_ether_byether(const struct ether_addr *addr,

                                  char *buffer, size_t buflen)

{

  char addrstr1[20], addrstr2[20];

  my_ether_ntoa((const uint8_t *)addr, addrstr1, 1);

  my_ether_ntoa((const uint8_t *)addr, addrstr2, 0);

  /* there should be no characters that need escaping */

  return mysnprintf(buffer, buflen, "(&%s(|(%s=%s)(%s=%s)))", ether_filter,

                    attmap_ether_macAddress, addrstr1,

                    attmap_ether_macAddress, addrstr2);

}

void ether_init(void)

{

  int i;

  /* set up search bases */

  if (ether_bases[0] == NULL)

    for (i = 0; i < NSS_LDAP_CONFIG_MAX_BASES; i++)

      ether_bases[i] = nslcd_cfg->bases[i];

  /* set up scope */

  if (ether_scope == LDAP_SCOPE_DEFAULT)

    ether_scope = nslcd_cfg->scope;

  /* set up attribute list */

  ether_attrs[0] = attmap_ether_cn;

  ether_attrs[1] = attmap_ether_macAddress;

  ether_attrs[2] = NULL;

}

/* TODO: check for errors in aton() */

#define WRITE_ETHER(fp, addr)                                               \

  ether_aton_r(addr, &tmpaddr);                                             \

  WRITE(fp, &tmpaddr, sizeof(uint8_t[6]));

static int write_ether(TFILE *fp, MYLDAP_ENTRY *entry,

                       const char *reqname, const char *reqether)

{

  int32_t tmpint32;

  struct ether_addr tmpaddr;

  const char *tmparr[2];

  const char **names, **ethers;

  int i, j;

  /* get the name of the ether entry */

  names = myldap_get_values(entry, attmap_ether_cn);

  if ((names == NULL) || (names[0] == NULL))

  {

    log_log(LOG_WARNING, "%s: %s: missing",

            myldap_get_dn(entry), attmap_ether_cn);

    return 0;

  }

  /* get the addresses */

  if (reqether != NULL)

  {

    ethers = tmparr;

    ethers[0] = reqether;

    ethers[1] = NULL;

  }

  else

  {

    ethers = myldap_get_values(entry, attmap_ether_macAddress);

    if ((ethers == NULL) || (ethers[0] == NULL))

    {

      log_log(LOG_WARNING, "%s: %s: missing",

              myldap_get_dn(entry), attmap_ether_macAddress);

      return 0;

    }

    /* TODO: move parsing of addresses up here */

  }

  /* write entries for all names and addresses */

  for (i = 0; names[i] != NULL; i++)

    if ((reqname == NULL) || (strcasecmp(reqname, names[i]) == 0))

      for (j = 0; ethers[j] != NULL; j++)

      {

        WRITE_INT32(fp, NSLCD_RESULT_BEGIN);

        WRITE_STRING(fp, names[i]);

        WRITE_ETHER(fp, ethers[j]);

      }

  return 0;

}

NSLCD_HANDLE(

  ether, byname, NSLCD_ACTION_ETHER_BYNAME,

  char name[BUFLEN_HOSTNAME];

  char filter[BUFLEN_FILTER];

  READ_STRING(fp, name);

  log_setrequest("ether=\"%s\"", name);,

  mkfilter_ether_byname(name, filter, sizeof(filter)),

  write_ether(fp, entry, name, NULL)

)

NSLCD_HANDLE(

  ether, byether, NSLCD_ACTION_ETHER_BYETHER,

  struct ether_addr addr;

  char addrstr[20];

  char filter[BUFLEN_FILTER];

  READ(fp, &addr, sizeof(uint8_t[6]));

  my_ether_ntoa((uint8_t *)&addr, addrstr, 1);

  log_setrequest("ether=%s", addrstr);,

  mkfilter_ether_byether(&addr, filter, sizeof(filter)),

  write_ether(fp, entry, NULL, addrstr)

)

NSLCD_HANDLE(

  ether, all, NSLCD_ACTION_ETHER_ALL,

  const char *filter;

  log_setrequest("ether(all)");,

  (filter = ether_filter, 0),

  write_ether(fp, entry, NULL, NULL)

)