/*

   networks.c - NSS lookup functions for networks database

   Copyright (C) 2006 West Consulting

   Copyright (C) 2006-2015 Arthur de Jong

   Copyright (C) 2010 Symas Corporation

   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 <string.h>

#include <errno.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include "prototypes.h"

#include "common.h"

#include "compat/attrs.h"

/* Redefine some ERROR_OUT macros as we also want to set h_errnop. */

#undef ERROR_OUT_OPENERROR

#define ERROR_OUT_OPENERROR                                                 \

  *errnop = ENOENT;                                                         \

  *h_errnop = HOST_NOT_FOUND;                                               \

  return (errno == EAGAIN) ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;

#undef ERROR_OUT_READERROR

#define ERROR_OUT_READERROR(fp)                                             \

  (void)tio_close(fp);                                                      \

  fp = NULL;                                                                \

  *errnop = ENOENT;                                                         \

  *h_errnop = NO_RECOVERY;                                                  \

  return NSS_STATUS_UNAVAIL;

#undef ERROR_OUT_BUFERROR

#define ERROR_OUT_BUFERROR(fp)                                              \

  *errnop = ERANGE;                                                         \

  *h_errnop = NETDB_INTERNAL;                                               \

  return NSS_STATUS_TRYAGAIN;

#undef ERROR_OUT_WRITEERROR

#define ERROR_OUT_WRITEERROR(fp)                                            \

  ERROR_OUT_READERROR(fp)

/* read a single network entry from the stream, ignoring entries

   that are not AF_INET (IPv4), result is stored in result */

static nss_status_t read_netent(TFILE *fp, struct netent *result,

                                char *buffer, size_t buflen, int *errnop,

                                int *h_errnop)

{

  int32_t tmpint32, tmp2int32, tmp3int32;

  int32_t numaddr;

  int readaf;

  size_t bufptr = 0;

  nss_status_t retv = NSS_STATUS_NOTFOUND;

  memset(result, 0, sizeof(struct netent));

  /* read the network entry */

  READ_BUF_STRING(fp, result->n_name);

  READ_BUF_STRINGLIST(fp, result->n_aliases);

  result->n_addrtype = AF_INET;

  /* read number of addresses to follow */

  READ_INT32(fp, numaddr);

  /* go through the address list and filter on af */

  while (--numaddr >= 0)

  {

    /* read address family and size */

    READ_INT32(fp, readaf);

    READ_INT32(fp, tmp2int32); /* address length */

    if ((readaf == AF_INET) && (tmp2int32 == 4))

    {

      /* read address and translate to host byte order */

      READ_INT32(fp, result->n_net);

      /* signal that we've read a proper entry */

      retv = NSS_STATUS_SUCCESS;

      /* don't return here to not upset the stream */

    }

    else

    {

      /* skip unsupported address families */

      SKIP(fp, tmpint32);

    }

  }

  return retv;

}

/* write an address value */

/* version 2.10 of glibc changed the address from network to host order

   (changelog entry 2009-07-01) */

#define WRITE_ADDRESS(fp, addr)                                             \

  WRITE_INT32(fp, AF_INET);                                                 \

  WRITE_INT32(fp, 4);                                                       \

  WRITE_INT32(fp, addr);

#ifdef NSS_FLAVOUR_GLIBC

/* get a network entry by name */

nss_status_t NSS_NAME(getnetbyname_r)(const char *name,

                                      struct netent *result, char *buffer,

                                      size_t buflen, int *errnop,

                                      int *h_errnop)

{

  NSS_GETONE(NSLCD_ACTION_NETWORK_BYNAME,

             WRITE_STRING(fp, name),

             read_netent(fp, result, buffer, buflen, errnop, h_errnop));

}

/* Note: the af parameter is ignored and is assumed to be AF_INET */

/* TODO: implement handling of af parameter */

nss_status_t NSS_NAME(getnetbyaddr_r)(uint32_t addr, int UNUSED(af),

                                      struct netent *result, char *buffer,

                                      size_t buflen, int *errnop,

                                      int *h_errnop)

{

  NSS_GETONE(NSLCD_ACTION_NETWORK_BYADDR,

             WRITE_ADDRESS(fp, addr),

             read_netent(fp, result, buffer, buflen, errnop, h_errnop));

}

/* thread-local file pointer to an ongoing request */

static TLS TFILE *netentfp;

/* start a request to read all networks */

nss_status_t NSS_NAME(setnetent)(int UNUSED(stayopen))

{

  NSS_SETENT(netentfp);

}

/* get a single network entry from the stream */

nss_status_t NSS_NAME(getnetent_r)(struct netent *result,

                                   char *buffer, size_t buflen, int *errnop,

                                   int *h_errnop)

{

  NSS_GETENT(netentfp, NSLCD_ACTION_NETWORK_ALL,

             read_netent(netentfp, result, buffer, buflen, errnop, h_errnop));

}

/* close the stream opened by setnetent() above */

nss_status_t NSS_NAME(endnetent)(void)

{

  NSS_ENDENT(netentfp);

}

#endif /* NSS_FLAVOUR_GLIBC */

#ifdef NSS_FLAVOUR_SOLARIS

#ifdef HAVE_STRUCT_NSS_XBYY_ARGS_RETURNLEN

static char *netent2str(struct netent *result, char *buffer, size_t buflen)

{

  int i, res;

  struct in_addr priv_in_addr;

  priv_in_addr.s_addr = htonl(result->n_net);

  res = snprintf(buffer, buflen, "%s %s", result->n_name, inet_ntoa(priv_in_addr));

  if ((res < 0) || (res >= (int)buflen))

    return NULL;

  if (result->n_aliases)

    for (i = 0; result->n_aliases[i]; i++)

    {

      strlcat(buffer, " ", buflen);

      strlcat(buffer, result->n_aliases[i], buflen);

    }

  if (strlen(buffer) >= buflen - 1)

    return NULL;

  return buffer;

}

#endif /* HAVE_STRUCT_NSS_XBYY_ARGS_RETURNLEN */

static nss_status_t read_result(TFILE *fp, nss_XbyY_args_t *args)

{

  READ_RESULT(netent, &args->erange, &args->h_errno);

}

/* more of a dirty hack */

#define h_errnop (&(NSS_ARGS(args)->h_errno))

static nss_status_t networks_getnetbyname(nss_backend_t UNUSED(*be), void *args)

{

  NSS_GETONE(NSLCD_ACTION_NETWORK_BYNAME,

             WRITE_STRING(fp, NSS_ARGS(args)->key.name),

             read_result(fp, args));

}

static nss_status_t networks_getnetbyaddr(nss_backend_t UNUSED(*be), void *args)

{

  NSS_GETONE(NSLCD_ACTION_NETWORK_BYADDR,

             WRITE_ADDRESS(fp, NSS_ARGS(args)->key.netaddr.net),

             read_result(fp, args));

}

static nss_status_t networks_setnetent(nss_backend_t *be, void UNUSED(*args))

{

  NSS_SETENT(LDAP_BE(be)->fp);

}

static nss_status_t networks_getnetent(nss_backend_t *be, void *args)

{

  NSS_GETENT(LDAP_BE(be)->fp, NSLCD_ACTION_NETWORK_ALL,

             read_result(LDAP_BE(be)->fp, args));

}

static nss_status_t networks_endnetent(nss_backend_t *be, void UNUSED(*args))

{

  NSS_ENDENT(LDAP_BE(be)->fp);

}

static nss_backend_op_t networks_ops[] = {

  nss_ldap_destructor,

  networks_endnetent,

  networks_setnetent,

  networks_getnetent,

  networks_getnetbyname,

  networks_getnetbyaddr

};

nss_backend_t *NSS_NAME(networks_constr)(const char UNUSED(*db_name),

                                         const char UNUSED(*src_name),

                                         const char UNUSED(*cfg_args))

{

  return nss_ldap_constructor(networks_ops, sizeof(networks_ops));

}

#endif /* NSS_FLAVOUR_SOLARIS */