/*
   rpc.c - rpc name lookup routines
   Parts of this file were part of the nss_ldap library (as ldap-rpc.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>
#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"

/* ( nisSchema.2.5 NAME 'oncRpc' SUP top STRUCTURAL
 *   DESC 'Abstraction of an Open Network Computing (ONC)
 *         [RFC1057] Remote Procedure Call (RPC) binding.
 *         This class maps an ONC RPC number to a name.
 *         The distinguished value of the cn attribute denotes
 *         the RPC service's canonical name'
 *   MUST ( cn $ oncRpcNumber )
 *   MAY description )
 */

/* the search base for searches */
const char *rpc_bases[NSS_LDAP_CONFIG_MAX_BASES] = { NULL };

/* the search scope for searches */
int rpc_scope = LDAP_SCOPE_DEFAULT;

/* the basic search filter for searches */
const char *rpc_filter = "(objectClass=oncRpc)";

/* the attributes to request with searches */
const char *attmap_rpc_cn           = "cn";
const char *attmap_rpc_oncRpcNumber = "oncRpcNumber";

/* the attribute list to request with searches */
static const char *rpc_attrs[3];

static int mkfilter_rpc_byname(const char *name, char *buffer, size_t buflen)
{
  char safename[BUFLEN_SAFENAME];
  /* escape attribute */
  if (myldap_escape(name, safename, sizeof(safename)))
  {
    log_log(LOG_ERR, "mkfilter_rpc_byname(): safename buffer too small");
    return -1;
  }
  /* build filter */
  return mysnprintf(buffer, buflen, "(&%s(%s=%s))",
                    rpc_filter, attmap_rpc_cn, safename);
}

static int mkfilter_rpc_bynumber(int number, char *buffer, size_t buflen)
{
  return mysnprintf(buffer, buflen, "(&%s(%s=%d))",
                    rpc_filter, attmap_rpc_oncRpcNumber, number);
}

void rpc_init(void)
{
  int i;
  /* set up search bases */
  if (rpc_bases[0] == NULL)
    for (i = 0; i < NSS_LDAP_CONFIG_MAX_BASES; i++)
      rpc_bases[i] = nslcd_cfg->bases[i];
  /* set up scope */
  if (rpc_scope == LDAP_SCOPE_DEFAULT)
    rpc_scope = nslcd_cfg->scope;
  /* set up attribute list */
  rpc_attrs[0] = attmap_rpc_cn;
  rpc_attrs[1] = attmap_rpc_oncRpcNumber;
  rpc_attrs[2] = NULL;
}

/* write a single rpc entry to the stream */
static int write_rpc(TFILE *fp, MYLDAP_ENTRY *entry, const char *reqname)
{
  int32_t tmpint32, tmp2int32, tmp3int32;
  const char *name;
  const char **aliases;
  const char **numbers;
  char *tmp;
  unsigned long number;
  int i;
  /* get the most canonical name */
  name = myldap_get_rdn_value(entry, attmap_rpc_cn);
  /* get the other names for the rpc entries */
  aliases = myldap_get_values(entry, attmap_rpc_cn);
  if ((aliases == NULL) || (aliases[0] == NULL))
  {
    log_log(LOG_WARNING, "%s: %s: missing",
            myldap_get_dn(entry), attmap_rpc_cn);
    return 0;
  }
  /* if the rpc name is not yet found, get the first entry */
  if (name == NULL)
    name = aliases[0];
  /* check case of returned rpc entry */
  if ((reqname != NULL) && (STR_CMP(reqname, name) != 0))
  {
    for (i = 0; (aliases[i] != NULL) && (STR_CMP(reqname, aliases[i]) != 0); i++)
      /* nothing */ ;
    if (aliases[i] == NULL)
      return 0; /* neither the name nor any of the aliases matched */
  }
  /* get the rpc number */
  numbers = myldap_get_values(entry, attmap_rpc_oncRpcNumber);
  if ((numbers == NULL) || (numbers[0] == NULL))
  {
    log_log(LOG_WARNING, "%s: %s: missing",
            myldap_get_dn(entry), attmap_rpc_oncRpcNumber);
    return 0;
  }
  else if (numbers[1] != NULL)
  {
    log_log(LOG_WARNING, "%s: %s: multiple values",
            myldap_get_dn(entry), attmap_rpc_oncRpcNumber);
  }
  errno = 0;
  number = strtol(numbers[0], &tmp, 10);
  if ((*(numbers[0]) == '\0') || (*tmp != '\0'))
  {
    log_log(LOG_WARNING, "%s: %s: non-numeric",
            myldap_get_dn(entry), attmap_rpc_oncRpcNumber);
    return 0;
  }
  else if ((errno != 0) || (number > UINT32_MAX))
  {
    log_log(LOG_WARNING, "%s: %s: out of range",
            myldap_get_dn(entry), attmap_rpc_oncRpcNumber);
    return 0;
  }
  /* write the entry */
  WRITE_INT32(fp, NSLCD_RESULT_BEGIN);
  WRITE_STRING(fp, name);
  WRITE_STRINGLIST_EXCEPT(fp, aliases, name);
  WRITE_INT32(fp, number);
  return 0;
}

NSLCD_HANDLE(
  rpc, byname, NSLCD_ACTION_RPC_BYNAME,
  char name[BUFLEN_NAME];
  char filter[BUFLEN_FILTER];
  READ_STRING(fp, name);
  log_setrequest("rpc=\"%s\"", name);,
  mkfilter_rpc_byname(name, filter, sizeof(filter)),
  write_rpc(fp, entry, name)
)

NSLCD_HANDLE(
  rpc, bynumber, NSLCD_ACTION_RPC_BYNUMBER,
  int number;
  char filter[BUFLEN_FILTER];
  READ_INT32(fp, number);
  log_setrequest("rpc=%lu", (unsigned long int)number);,
  mkfilter_rpc_bynumber(number, filter, sizeof(filter)),
  write_rpc(fp, entry, NULL)
)

NSLCD_HANDLE(
  rpc, all, NSLCD_ACTION_RPC_ALL,
  const char *filter;
  log_setrequest("rpc(all)");,
  (filter = rpc_filter, 0),
  write_rpc(fp, entry, NULL)
)