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glibc  2.9
Defines | Functions
nisplus-alias.c File Reference
#include <atomic.h>
#include <nss.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#include <aliases.h>
#include <bits/libc-lock.h>
#include <rpcsvc/nis.h>
#include "nss-nisplus.h"

Go to the source code of this file.

Defines

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

Functions

 __libc_lock_define_initialized (static, lock)
static int _nss_nisplus_parse_aliasent (nis_result *result, unsigned long entry, struct aliasent *alias, char *buffer, size_t buflen, int *errnop)
static enum nss_status internal_setaliasent (void)
enum nss_status _nss_nisplus_setaliasent (void)
enum nss_status _nss_nisplus_endaliasent (void)
static enum nss_status internal_nisplus_getaliasent_r (struct aliasent *alias, char *buffer, size_t buflen, int *errnop)
enum nss_status _nss_nisplus_getaliasent_r (struct aliasent *result, char *buffer, size_t buflen, int *errnop)
enum nss_status _nss_nisplus_getaliasbyname_r (const char *name, struct aliasent *alias, char *buffer, size_t buflen, int *errnop)

Define Documentation

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

Function Documentation

__libc_lock_define_initialized ( static  ,
lock   
)

Definition at line 32 of file nisplus-alias.c.

{
  if (tablename_val == NULL)
    {
      const char *local_dir = nis_local_directory ();
      size_t local_dir_len = strlen (local_dir);
      static const char prefix[] = "mail_aliases.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 214 of file nisplus-alias.c.

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enum nss_status _nss_nisplus_getaliasbyname_r ( const char *  name,
struct aliasent alias,
char *  buffer,
size_t  buflen,
int errnop 
)

Definition at line 279 of file nisplus-alias.c.

{
  int parse_res;

  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 (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, 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;
    }

  parse_res = _nss_nisplus_parse_aliasent (result, 0, alias,
                                      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;
      else
       return NSS_STATUS_NOTFOUND;
    }

  return NSS_STATUS_SUCCESS;
}

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enum nss_status _nss_nisplus_getaliasent_r ( struct aliasent result,
char *  buffer,
size_t  buflen,
int errnop 
)

Definition at line 264 of file nisplus-alias.c.

{
  int status;

  __libc_lock_lock (lock);

  status = internal_nisplus_getaliasent_r (result, buffer, buflen, errnop);

  __libc_lock_unlock (lock);

  return status;
}

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static int _nss_nisplus_parse_aliasent ( nis_result *  result,
unsigned long  entry,
struct aliasent alias,
char *  buffer,
size_t  buflen,
int errnop 
) [static]

Definition at line 74 of file nisplus-alias.c.

{
  if (result == NULL)
    return 0;

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

  if (NISENTRYLEN (entry, 1, result) >= buflen)
    {
      /* The line is too long for our buffer.  */
    no_more_room:
      *errnop = ERANGE;
      return -1;
    }

  char *cp = __stpncpy (buffer, NISENTRYVAL (entry, 1, result),
                     NISENTRYLEN (entry, 1, result));
  *cp = '\0';

  char *first_unused = cp + 1;
  size_t room_left = buflen - (first_unused - buffer);

  alias->alias_local = 0;
  alias->alias_members_len = 0;

  if (NISENTRYLEN (entry, 0, result) >= room_left)
    goto no_more_room;

  cp = __stpncpy (first_unused, NISENTRYVAL (entry, 0, result),
                NISENTRYLEN (entry, 0, result));
  *cp = '\0';
  alias->alias_name = first_unused;

  /* Terminate the line for any case.  */
  cp = strpbrk (alias->alias_name, "#\n");
  if (cp != NULL)
    *cp = '\0';

  size_t len = strlen (alias->alias_name) + 1;
  first_unused += len;
  room_left -= len;

  /* Adjust the pointer so it is aligned for
     storing pointers.  */
  size_t adjust = ((__alignof__ (char *)
                  - (first_unused - (char *) 0) % __alignof__ (char *))
                 % __alignof__ (char *));
  if (room_left < adjust)
    goto no_more_room;
  first_unused += adjust;
  room_left -= adjust;

  alias->alias_members = (char **) first_unused;

  char *line = buffer;
  while (*line != '\0')
    {
      /* Skip leading blanks.  */
      while (isspace (*line))
       ++line;

      if (*line == '\0')
       break;

      if (room_left < sizeof (char *))
       goto no_more_room;
      room_left -= sizeof (char *);
      alias->alias_members[alias->alias_members_len] = line;

      while (*line != '\0' && *line != ',')
       ++line;

      if (line != alias->alias_members[alias->alias_members_len])
       {
         *line++ = '\0';
         ++alias->alias_members_len;
       }
      else if (*line == ',')
       ++line;
    }

  return alias->alias_members_len == 0 ? 0 : 1;
}

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Definition at line 200 of file nisplus-alias.c.

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static enum nss_status internal_nisplus_getaliasent_r ( struct aliasent alias,
char *  buffer,
size_t  buflen,
int errnop 
) [static]

Definition at line 231 of file nisplus-alias.c.

{
  int parse_res;

  if (result == NULL)
    {
      enum nss_status status;

      status = internal_setaliasent ();
      if (result == NULL || status != NSS_STATUS_SUCCESS)
       return status;
    }

  /* Get the next entry until we found a correct one. */
  do
    {
      if (next_entry >= result->objects.objects_len)
       return NSS_STATUS_NOTFOUND;

      parse_res = _nss_nisplus_parse_aliasent (result, next_entry, alias,
                                          buffer, buflen, errnop);
      if (parse_res == -1)
       return NSS_STATUS_TRYAGAIN;

      ++next_entry;
    }
  while (!parse_res);

  return NSS_STATUS_SUCCESS;
}

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static enum nss_status internal_setaliasent ( void  ) [static]

Definition at line 166 of file nisplus-alias.c.

{
  enum nss_status status;
  int err;

  if (result !=  NULL)
    {
      nis_freeresult (result);
      result = NULL;
    }

  if (_nss_create_tablename (&err) != NSS_STATUS_SUCCESS)
    return NSS_STATUS_UNAVAIL;

  next_entry = 0;
  result = nis_list (tablename_val, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
  if (result == NULL)
    {
      status = NSS_STATUS_TRYAGAIN;
      __set_errno (ENOMEM);
    }
  else
    {
      status = niserr2nss (result->status);
      if (status != NSS_STATUS_SUCCESS)
       {
         nis_freeresult (result);
         result = NULL;
       }
    }
  return status;
}

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