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glibc  2.9
Defines | Functions
nisplus-network.c File Reference
#include <atomic.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <nss.h>
#include <stdint.h>
#include <string.h>
#include <arpa/inet.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].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 enum nss_status _nss_create_tablename (int *errnop)
enum nss_status _nss_nisplus_setnetent (int stayopen)
enum nss_status _nss_nisplus_endnetent (void)
static enum nss_status internal_nisplus_getnetent_r (struct netent *network, char *buffer, size_t buflen, int *errnop, int *herrnop)
enum nss_status _nss_nisplus_getnetent_r (struct netent *result, char *buffer, size_t buflen, int *errnop, int *herrnop)
enum nss_status _nss_nisplus_getnetbyname_r (const char *name, struct netent *network, char *buffer, size_t buflen, int *errnop, int *herrnop)
enum nss_status _nss_nisplus_getnetbyaddr_r (uint32_t addr, const int type, struct netent *network, char *buffer, size_t buflen, int *errnop, int *herrnop)

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 34 of file nisplus-network.c.

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

  if (result == NULL)
    return 0;

  if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
      || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
      || strcmp (NIS_RES_OBJECT (result)[0].EN_data.en_type,
               "networks_tbl") != 0
      || NIS_RES_OBJECT (result)[0].EN_data.en_cols.en_cols_len < 3)
    return 0;

  if (NISENTRYLEN (0, 0, result) >= room_left)
    {
      /* The line is too long for our buffer.  */
    no_more_room:
      *errnop = ERANGE;
      return -1;
    }

  strncpy (first_unused, NISENTRYVAL (0, 0, result),
           NISENTRYLEN (0, 0, result));
  first_unused[NISENTRYLEN (0, 0, result)] = '\0';
  network->n_name = first_unused;
  size_t len = strlen (first_unused) + 1;
  room_left -= len;
  first_unused += len;

  network->n_addrtype = 0;
  network->n_net = inet_network (NISENTRYVAL (0, 2, result));

  /* XXX Rewrite at some point to allocate the array first and then
     copy the strings.  It wasteful to first concatenate the strings
     to just split them again later.  */
  char *line = first_unused;
  for (unsigned int i = 0; i < NIS_RES_NUMOBJ (result); ++i)
    {
      if (strcmp (NISENTRYVAL (i, 1, result), network->n_name) != 0)
        {
          if (NISENTRYLEN (i, 1, result) + 2 > room_left)
           goto no_more_room;

         *first_unused++ = ' ';
          first_unused = __stpncpy (first_unused, NISENTRYVAL (i, 1, result),
                                NISENTRYLEN (i, 1, result));
          room_left -= (NISENTRYLEN (i, 1, result) + 1);
        }
    }
  *first_unused++ = '\0';

  /* 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 + sizeof (char *))
    goto no_more_room;
  first_unused += adjust;
  room_left -= adjust;
  network->n_aliases = (char **) first_unused;

  /* For the terminating NULL pointer.  */
  room_left -= sizeof (char *);

  unsigned int i = 0;
  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 *);
      network->n_aliases[i++] = line;

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

      if (*line == ' ')
       *line++ = '\0';
    }
  network->n_aliases[i] = NULL;

  return 1;
}

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static enum nss_status _nss_create_tablename ( int errnop) [static]

Definition at line 145 of file nisplus-network.c.

{
  if (tablename_val == NULL)
    {
      const char *local_dir = nis_local_directory ();
      size_t local_dir_len = strlen (local_dir);
      static const char prefix[] = "networks.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 197 of file nisplus-network.c.

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enum nss_status _nss_nisplus_getnetbyaddr_r ( uint32_t  addr,
const int  type,
struct netent network,
char *  buffer,
size_t  buflen,
int errnop,
int herrnop 
)

Definition at line 415 of file nisplus-network.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;
    }

  {
    char buf[27 + tablename_len];
    char buf2[18];
    int olderr = errno;

    struct in_addr in = inet_makeaddr (addr, 0);
    strcpy (buf2, inet_ntoa (in));
    size_t b2len = strlen (buf2);

    while (1)
      {
       snprintf (buf, sizeof (buf), "[addr=%s],%s", buf2, tablename_val);
       nis_result *result = nis_list (buf, EXPAND_NAME | USE_DGRAM,
                                   NULL, NULL);

       if (result == NULL)
         {
           __set_errno (ENOMEM);
           return NSS_STATUS_TRYAGAIN;
         }
       enum nss_status retval = niserr2nss (result->status);
       if (__builtin_expect (retval != NSS_STATUS_SUCCESS, 0))
         {
           if (b2len > 2 && buf2[b2len - 2] == '.' && buf2[b2len - 1] == '0')
             {
              /* Try again, but with trailing dot(s)
                 removed (one by one) */
              buf2[b2len - 2] = '\0';
              b2len -= 2;
              nis_freeresult (result);
              continue;
             }

           if (retval == NSS_STATUS_TRYAGAIN)
             {
              *errnop = errno;
              *herrnop = NETDB_INTERNAL;
             }
           else
             __set_errno (olderr);
           nis_freeresult (result);
           return retval;
         }

       int parse_res = _nss_nisplus_parse_netent (result, network, buffer,
                                             buflen, errnop);

       nis_freeresult (result);

       if (parse_res > 0)
         return NSS_STATUS_SUCCESS;

       *herrnop = NETDB_INTERNAL;
       if (parse_res == -1)
         {
           *errnop = ERANGE;
           return NSS_STATUS_TRYAGAIN;
         }
       else
         {
           __set_errno (olderr);
           return NSS_STATUS_NOTFOUND;
         }
      }
  }
}

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enum nss_status _nss_nisplus_getnetbyname_r ( const char *  name,
struct netent network,
char *  buffer,
size_t  buflen,
int errnop,
int herrnop 
)

Definition at line 310 of file nisplus-network.c.

{
  int parse_res, retval;

  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;
      *herrnop = NETDB_INTERNAL;
      return NSS_STATUS_UNAVAIL;
    }

  nis_result *result;
  char buf[strlen (name) + 10 + tablename_len];
  int olderr = errno;

  /* Search at first in the alias list, and use the correct name
     for the next search */
  snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
  result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH | USE_DGRAM, NULL, NULL);

  if (result != NULL)
    {
      char *bufptr = buf;

      /* If we do not find it, try it as original name. But if the
        database is correct, we should find it in the first case, too */
      if ((result->status != NIS_SUCCESS
          && result->status != NIS_S_SUCCESS)
         || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
         || strcmp (result->objects.objects_val[0].EN_data.en_type,
                   "networks_tbl") != 0
         || (result->objects.objects_val[0].EN_data.en_cols.en_cols_len
             < 3))
       snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val);
      else
       {
         /* We need to allocate a new buffer since there is no
            guarantee the returned name has a length limit.  */
         const char *entryval = NISENTRYVAL (0, 0, result);
         size_t buflen = strlen (entryval) + 10 + tablename_len;
         bufptr = alloca (buflen);
         snprintf (bufptr, buflen, "[cname=%s],%s",
                  entryval, tablename_val);
       }

      nis_freeresult (result);
      result = nis_list (bufptr, FOLLOW_LINKS | FOLLOW_PATH | USE_DGRAM,
                      NULL, NULL);
    }

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

  retval = niserr2nss (result->status);
  if (__builtin_expect (retval != NSS_STATUS_SUCCESS, 0))
    {
      if (retval == NSS_STATUS_TRYAGAIN)
       {
         *errnop = errno;
         *herrnop = NETDB_INTERNAL;
       }
      else
       __set_errno (olderr);
      nis_freeresult (result);
      return retval;
    }

  parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen,
                                    errnop);

  nis_freeresult (result);

  if (parse_res > 0)
    return NSS_STATUS_SUCCESS;

  *herrnop = NETDB_INTERNAL;
  if (parse_res == -1)
    {
      *errnop = ERANGE;
      return NSS_STATUS_TRYAGAIN;
    }

  __set_errno (olderr);
  return NSS_STATUS_NOTFOUND;
}

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enum nss_status _nss_nisplus_getnetent_r ( struct netent result,
char *  buffer,
size_t  buflen,
int errnop,
int herrnop 
)

Definition at line 294 of file nisplus-network.c.

{
  int status;

  __libc_lock_lock (lock);

  status = internal_nisplus_getnetent_r (result, buffer, buflen, errnop,
                                    herrnop);

  __libc_lock_unlock (lock);

  return status;
}

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Definition at line 173 of file nisplus-network.c.

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static enum nss_status internal_nisplus_getnetent_r ( struct netent network,
char *  buffer,
size_t  buflen,
int errnop,
int herrnop 
) [static]

Definition at line 213 of file nisplus-network.c.

{
  int parse_res;

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

      if (result == NULL)
       {
         saved_res = NULL;

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

             if (status != NSS_STATUS_SUCCESS)
              return status;
           }

         result = nis_first_entry (tablename_val);
         if (result == NULL)
           {
             *errnop = errno;
             return NSS_STATUS_TRYAGAIN;
           }
         if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
           {
             int retval = niserr2nss (result->status);
             nis_freeresult (result);
             result = NULL;
             if (retval == NSS_STATUS_TRYAGAIN)
              {
                *herrnop = NETDB_INTERNAL;
                *errnop = errno;
                return retval;
              }
             else
              return retval;
           }
       }
      else
       {
         saved_res = 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)
           {
             int retval = niserr2nss (result->status);
             nis_freeresult (result);
             result = saved_res;
             if (retval == NSS_STATUS_TRYAGAIN)
              {
                *herrnop = NETDB_INTERNAL;
                *errnop = errno;
              }
             return retval;
           }
       }

      parse_res = _nss_nisplus_parse_netent (result, network, buffer,
                                        buflen, errnop);
      if (parse_res == -1)
        {
          *herrnop = NETDB_INTERNAL;
          return NSS_STATUS_TRYAGAIN;
        }

    }
  while (!parse_res);

  return NSS_STATUS_SUCCESS;
}

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