/*

   host.c - host name lookup routines

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

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

   Copyright (C) 1997-2005 Luke Howard

   Copyright (C) 2006 West Consulting

   Copyright (C) 2006-2014 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>

#include <sys/types.h>

#include <sys/socket.h>

#include <arpa/inet.h>

#include "common.h"

#include "log.h"

#include "myldap.h"

#include "cfg.h"

#include "attmap.h"

/* ( nisSchema.2.6 NAME 'ipHost' SUP top AUXILIARY

 *   DESC 'Abstraction of a host, an IP device. The distinguished

 *         value of the cn attribute denotes the host's canonical

 *         name. Device SHOULD be used as a structural class'

 *   MUST ( cn $ ipHostNumber )

 *   MAY ( l $ description $ manager ) )

 */

/* the search base for searches */

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

/* the search scope for searches */

int host_scope = LDAP_SCOPE_DEFAULT;

/* the basic search filter for searches */

const char *host_filter = "(objectClass=ipHost)";

/* the attributes to request with searches */

const char *attmap_host_cn           = "cn";

const char *attmap_host_ipHostNumber = "ipHostNumber";

/* the attribute list to request with searches */

static const char *host_attrs[3];

/* create a search filter for searching a host entry

   by name, return -1 on errors */

static int mkfilter_host_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_host_byname(): safename buffer too small");

    return -1;

  }

  /* build filter */

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

                    host_filter, attmap_host_cn, safename);

}

static int mkfilter_host_byaddr(const char *addrstr,

                                char *buffer, size_t buflen)

{

  char safeaddr[64];

  /* escape attribute */

  if (myldap_escape(addrstr, safeaddr, sizeof(safeaddr)))

  {

    log_log(LOG_ERR, "mkfilter_host_byaddr(): safeaddr buffer too small");

    return -1;

  }

  /* build filter */

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

                    host_filter, attmap_host_ipHostNumber, safeaddr);

}

void host_init(void)

{

  int i;

  /* set up search bases */

  if (host_bases[0] == NULL)

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

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

  /* set up scope */

  if (host_scope == LDAP_SCOPE_DEFAULT)

    host_scope = nslcd_cfg->scope;

  /* set up attribute list */

  host_attrs[0] = attmap_host_cn;

  host_attrs[1] = attmap_host_ipHostNumber;

  host_attrs[2] = NULL;

}

/* write a single host entry to the stream */

static int write_host(TFILE *fp, MYLDAP_ENTRY *entry)

{

  int32_t tmpint32, tmp2int32, tmp3int32;

  int numaddr, i;

  const char *hostname;

  const char **hostnames;

  const char **addresses;

  /* get the most canonical name */

  hostname = myldap_get_rdn_value(entry, attmap_host_cn);

  /* get the other names for the host */

  hostnames = myldap_get_values(entry, attmap_host_cn);

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

  {

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

            myldap_get_dn(entry), attmap_host_cn);

    return 0;

  }

  /* if the hostname is not yet found, get the first entry from hostnames */

  if (hostname == NULL)

    hostname = hostnames[0];

  /* get the addresses */

  addresses = myldap_get_values(entry, attmap_host_ipHostNumber);

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

  {

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

            myldap_get_dn(entry), attmap_host_ipHostNumber);

    return 0;

  }

  /* write the entry */

  WRITE_INT32(fp, NSLCD_RESULT_BEGIN);

  WRITE_STRING(fp, hostname);

  WRITE_STRINGLIST_EXCEPT(fp, hostnames, hostname);

  for (numaddr = 0; addresses[numaddr] != NULL; numaddr++)

    /* noting */ ;

  WRITE_INT32(fp, numaddr);

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

  {

    WRITE_ADDRESS(fp, entry, attmap_host_ipHostNumber, addresses[i]);

  }

  return 0;

}

NSLCD_HANDLE(

  host, byname, NSLCD_ACTION_HOST_BYNAME,

  char name[BUFLEN_HOSTNAME];

  char filter[BUFLEN_FILTER];

  READ_STRING(fp, name);

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

  mkfilter_host_byname(name, filter, sizeof(filter)),

  write_host(fp, entry)

)

NSLCD_HANDLE(

  host, byaddr, NSLCD_ACTION_HOST_BYADDR,

  int af;

  char addr[64];

  int len = sizeof(addr);

  char addrstr[64];

  char filter[BUFLEN_FILTER];

  READ_ADDRESS(fp, addr, len, af);

  /* translate the address to a string */

  if (inet_ntop(af, addr, addrstr, sizeof(addrstr)) == NULL)

  {

    log_log(LOG_WARNING, "unable to convert address to string");

    return -1;

  }

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

  mkfilter_host_byaddr(addrstr, filter, sizeof(filter)),

  write_host(fp, entry)

)

NSLCD_HANDLE(

  host, all, NSLCD_ACTION_HOST_ALL,

  const char *filter;

  log_setrequest("host(all)");,

  (filter = host_filter, 0),

  write_host(fp, entry)

)