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glibc  2.9
Defines | Functions
nisplus-ethers.c File Reference
#include <atomic.h>
#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <netdb.h>
#include <nss.h>
#include <string.h>
#include <netinet/ether.h>
#include <netinet/if_ether.h>
#include <rpcsvc/nis.h>
#include <bits/libc-lock.h>
#include "nss-nisplus.h"

Go to the source code of this file.

Defines

#define NISENTRYVAL(idx, col, res)   (NIS_RES_OBJECT (res)[idx].zo_data.objdata_u.en_data.en_cols.en_cols_val[col].ec_value.ec_value_val)
#define NISENTRYLEN(idx, col, res)   (NIS_RES_OBJECT (res)[idx].zo_data.objdata_u.en_data.en_cols.en_cols_val[col].ec_value.ec_value_len)

Functions

 __libc_lock_define_initialized (static, lock)
static enum nss_status _nss_create_tablename (int *errnop)
enum nss_status _nss_nisplus_setetherent (int stayopen)
enum nss_status _nss_nisplus_endetherent (void)
static enum nss_status internal_nisplus_getetherent_r (struct etherent *ether, char *buffer, size_t buflen, int *errnop)
enum nss_status _nss_nisplus_getetherent_r (struct etherent *result, char *buffer, size_t buflen, int *errnop)
enum nss_status _nss_nisplus_gethostton_r (const char *name, struct etherent *eth, char *buffer, size_t buflen, int *errnop)
enum nss_status _nss_nisplus_getntohost_r (const struct ether_addr *addr, struct etherent *eth, char *buffer, size_t buflen, int *errnop)

Define Documentation

#define NISENTRYLEN (   idx,
  col,
  res 
)    (NIS_RES_OBJECT (res)[idx].zo_data.objdata_u.en_data.en_cols.en_cols_val[col].ec_value.ec_value_len)
#define NISENTRYVAL (   idx,
  col,
  res 
)    (NIS_RES_OBJECT (res)[idx].zo_data.objdata_u.en_data.en_cols.en_cols_val[col].ec_value.ec_value_val)

Function Documentation

__libc_lock_define_initialized ( static  ,
lock   
)

Definition at line 35 of file nisplus-ethers.c.

{
  char *p = buffer;
  size_t room_left = buflen;

  if (result == NULL)
    return 0;

  if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
      || NIS_RES_NUMOBJ (result) != 1
      || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
      || strcmp (NIS_RES_OBJECT (result)->EN_data.en_type,
               "ethers_tbl") != 0
      || NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 2)
    return 0;

  /* Generate the ether entry format and use the normal parser */
  if (NISENTRYLEN (0, 0, result) + 1 > room_left)
    {
      *errnop = ERANGE;
      return -1;
    }
  char *cp = __stpncpy (p, NISENTRYVAL (0, 0, result),
                     NISENTRYLEN (0, 0, result));
  *cp = '\0';
  room_left -= NISENTRYLEN (0, 0, result) + 1;
  ether->e_name = p;

  struct ether_addr *ea = ether_aton (NISENTRYVAL (0, 1, result));
  if (ea == NULL)
    {
      *errnop = EINVAL;
      return -2;
    }

  ether->e_addr = *ea;

  return 1;
}

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static enum nss_status _nss_create_tablename ( int errnop) [static]

Definition at line 91 of file nisplus-ethers.c.

{
  if (tablename_val == NULL)
    {
      const char *local_dir = nis_local_directory ();
      size_t local_dir_len = strlen (local_dir);
      static const char prefix[] = "ethers.org_dir.";

      char *p = malloc (sizeof (prefix) + local_dir_len);
      if (p == NULL)
       {
         *errnop = errno;
         return NSS_STATUS_TRYAGAIN;
       }

      memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);

      tablename_len = sizeof (prefix) - 1 + local_dir_len;

      atomic_write_barrier ();

      tablename_val = p;
    }
  return NSS_STATUS_SUCCESS;
}

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Definition at line 143 of file nisplus-ethers.c.

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enum nss_status _nss_nisplus_getetherent_r ( struct etherent *  result,
char *  buffer,
size_t  buflen,
int errnop 
)

Definition at line 223 of file nisplus-ethers.c.

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enum nss_status _nss_nisplus_gethostton_r ( const char *  name,
struct etherent *  eth,
char *  buffer,
size_t  buflen,
int errnop 
)

Definition at line 238 of file nisplus-ethers.c.

{
  if (tablename_val == NULL)
    {
      enum nss_status status = _nss_create_tablename (errnop);

      if (status != NSS_STATUS_SUCCESS)
       return status;
    }

  if (name == NULL)
    {
      *errnop = EINVAL;
      return NSS_STATUS_UNAVAIL;
    }

  char buf[strlen (name) + 9 + tablename_len];
  int olderr = errno;

  snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);

  nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
                             NULL, NULL);

  if (result == NULL)
    {
      *errnop = ENOMEM;
      return NSS_STATUS_TRYAGAIN;
    }

  if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
    {
      enum nss_status status = niserr2nss (result->status);
      nis_freeresult (result);
      return status;
    }

  int parse_res = _nss_nisplus_parse_etherent (result, eth, buffer,
                                          buflen, errnop);

  /* We do not need the lookup result anymore.  */
  nis_freeresult (result);

  if (__builtin_expect (parse_res < 1, 0))
    {
      __set_errno (olderr);

      if (parse_res == -1)
       return NSS_STATUS_TRYAGAIN;

      return NSS_STATUS_NOTFOUND;
    }

  return NSS_STATUS_SUCCESS;
}

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enum nss_status _nss_nisplus_getntohost_r ( const struct ether_addr addr,
struct etherent *  eth,
char *  buffer,
size_t  buflen,
int errnop 
)

Definition at line 296 of file nisplus-ethers.c.

{
  if (tablename_val == NULL)
    {
      __libc_lock_lock (lock);

      enum nss_status status = _nss_create_tablename (errnop);

      __libc_lock_unlock (lock);

      if (status != NSS_STATUS_SUCCESS)
       return status;
    }

  if (addr == NULL)
    {
      *errnop = EINVAL;
      return NSS_STATUS_UNAVAIL;
    }

  char buf[26 + tablename_len];

  snprintf (buf, sizeof (buf),
           "[addr=%" PRIx8 ":%" PRIx8 ":%" PRIx8 ":%" PRIx8 ":%" PRIx8
           ":%" PRIx8 "],%s",
           addr->ether_addr_octet[0], addr->ether_addr_octet[1],
           addr->ether_addr_octet[2], addr->ether_addr_octet[3],
           addr->ether_addr_octet[4], addr->ether_addr_octet[5],
           tablename_val);

  nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
                             NULL, NULL);

  if (result == NULL)
    {
      *errnop = ENOMEM;
      return NSS_STATUS_TRYAGAIN;
    }

  if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
    {
      enum nss_status status = niserr2nss (result->status);
      nis_freeresult (result);
      return status;
    }

  int parse_res = _nss_nisplus_parse_etherent (result, eth, buffer,
                                          buflen, errnop);

  /* We do not need the lookup result anymore.  */
  nis_freeresult (result);

  if (__builtin_expect (parse_res < 1, 0))
    {
      if (parse_res == -1)
       return NSS_STATUS_TRYAGAIN;

      return NSS_STATUS_NOTFOUND;
    }

  return NSS_STATUS_SUCCESS;
}

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Definition at line 119 of file nisplus-ethers.c.

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static enum nss_status internal_nisplus_getetherent_r ( struct etherent *  ether,
char *  buffer,
size_t  buflen,
int errnop 
) [static]

Definition at line 159 of file nisplus-ethers.c.

{
  if (tablename_val == NULL)
    {
      enum nss_status status = _nss_create_tablename (errnop);

      if (status != NSS_STATUS_SUCCESS)
       return status;
    }

  /* Get the next entry until we found a correct one. */
  int parse_res;
  do
    {
      nis_result *saved_result;

      if (result == NULL)
       {
         saved_result = NULL;
         result = nis_first_entry (tablename_val);
         if (result == NULL)
           {
             *errnop = errno;
             return NSS_STATUS_TRYAGAIN;
           }
         if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
           return niserr2nss (result->status);
       }
      else
       {
         saved_result = result;
         result = nis_next_entry (tablename_val, &result->cookie);
         if (result == NULL)
           {
             *errnop = errno;
             return NSS_STATUS_TRYAGAIN;
           }
         if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
           {
             nis_freeresult (saved_result);
             return niserr2nss (result->status);
           }
       }

      parse_res = _nss_nisplus_parse_etherent (result, ether, buffer,
                                          buflen, errnop);
      if (parse_res == -1)
       {
         nis_freeresult (result);
         result = saved_result;
         return NSS_STATUS_TRYAGAIN;
       }

      if (saved_result != NULL)
       nis_freeresult (saved_result);

    }
  while (!parse_res);

  return NSS_STATUS_SUCCESS;
}

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