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glibc  2.9
Defines | Functions | Variables
nisplus-service.c File Reference
#include <atomic.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <nss.h>
#include <string.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 int _nss_nisplus_parse_servent (nis_result *result, struct servent *serv, char *buffer, size_t buflen, int *errnop)
static enum nss_status _nss_create_tablename (int *errnop)
enum nss_status _nss_nisplus_setservent (int stayopen)
enum nss_status _nss_nisplus_endservent (void)
static enum nss_status internal_nisplus_getservent_r (struct servent *serv, char *buffer, size_t buflen, int *errnop)
enum nss_status _nss_nisplus_getservent_r (struct servent *result, char *buffer, size_t buflen, int *errnop)
enum nss_status _nss_nisplus_getservbyname_r (const char *name, const char *protocol, struct servent *serv, char *buffer, size_t buflen, int *errnop)
enum nss_status _nss_nisplus_getservbyport_r (const int number, const char *protocol, struct servent *serv, char *buffer, size_t buflen, int *errnop)

Variables

static nis_result * result
static nis_name tablename_val
static u_long tablename_len

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)

Definition at line 41 of file nisplus-service.c.

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

Definition at line 38 of file nisplus-service.c.


Function Documentation

__libc_lock_define_initialized ( static  ,
lock   
)

Definition at line 34 of file getnetgrent_r.c.

{
  /* Remember the first service_entry, it's always the same.  */
  static bool startp_initialized;
  static service_user *startp;
  int no_more;

  if (!startp_initialized)
    {
      /* Executing this more than once at the same time must yield the
        same result every time.  So we need no locking.  */
      no_more = __nss_netgroup_lookup (nipp, "setnetgrent", fctp);
      startp = no_more ? (service_user *) -1 : *nipp;
      PTR_MANGLE (startp);
      atomic_write_barrier ();
      startp_initialized = true;
    }
  else
    {
      service_user *nip = startp;
      PTR_DEMANGLE (nip);
      if (nip == (service_user *) -1)
       /* No services at all.  */
       return 1;

      /* Reset to the beginning of the service list.  */
      *nipp = nip;
      /* Look up the first function.  */
      no_more = __nss_lookup (nipp, "setnetgrent", NULL, fctp);
    }
  return no_more;
}
static enum nss_status _nss_create_tablename ( int errnop) [static]

Definition at line 148 of file nisplus-service.c.

{
  if (tablename_val == NULL)
    {
      const char *local_dir = nis_local_directory ();
      size_t local_dir_len = strlen (local_dir);
      static const char prefix[] = "services.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 199 of file nisplus-service.c.

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enum nss_status _nss_nisplus_getservbyname_r ( const char *  name,
const char *  protocol,
struct servent serv,
char *  buffer,
size_t  buflen,
int errnop 
)

Definition at line 295 of file nisplus-service.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 (name == NULL || protocol == NULL)
    {
      *errnop = EINVAL;
      return NSS_STATUS_NOTFOUND;
    }

  size_t protocol_len = strlen (protocol);
  char buf[strlen (name) + protocol_len + 17 + 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,proto=%s],%s", name, protocol,
           tablename_val);
  nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
                             NULL, NULL);

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

      /* If we did 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 (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
         || strcmp (NIS_RES_OBJECT (result)->EN_data.en_type,
                   "services_tbl") != 0
         || NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 4)
       snprintf (buf, sizeof (buf), "[cname=%s,proto=%s],%s", name, protocol,
                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) + protocol_len + 17
                        + tablename_len);
         bufptr = alloca (buflen);
         snprintf (bufptr, buflen, "[cname=%s,proto=%s],%s",
                  entryval, protocol, tablename_val);
       }

      nis_freeresult (result);
      result = nis_list (bufptr, 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);

      __set_errno (olderr);

      nis_freeresult (result);
      return status;
    }

  int parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen,
                                         errnop);
  nis_freeresult (result);

  if (__builtin_expect (parse_res < 1, 0))
    {
      if (parse_res == -1)
       {
         *errnop = ERANGE;
         return NSS_STATUS_TRYAGAIN;
       }
      else
       {
         __set_errno (olderr);
         return NSS_STATUS_NOTFOUND;
       }
    }

  return NSS_STATUS_SUCCESS;
}

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enum nss_status _nss_nisplus_getservbyport_r ( const int  number,
const char *  protocol,
struct servent serv,
char *  buffer,
size_t  buflen,
int errnop 
)

Definition at line 397 of file nisplus-service.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 (protocol == NULL)
    {
      *errnop = EINVAL;
      return NSS_STATUS_NOTFOUND;
    }

  char buf[17 + 3 * sizeof (int) + strlen (protocol) + tablename_len];
  int olderr = errno;

  snprintf (buf, sizeof (buf), "[port=%d,proto=%s],%s",
           number, protocol, 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);

      __set_errno (olderr);

      nis_freeresult (result);
      return status;
    }

  int parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen,
                                         errnop);
  nis_freeresult (result);

  if (__builtin_expect (parse_res < 1, 0))
    {
      if (parse_res == -1)
       {
         *errnop = ERANGE;
         return NSS_STATUS_TRYAGAIN;
       }
      else
       {
         __set_errno (olderr);
         return NSS_STATUS_NOTFOUND;
       }
    }

  return NSS_STATUS_SUCCESS;
}

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enum nss_status _nss_nisplus_getservent_r ( struct servent result,
char *  buffer,
size_t  buflen,
int errnop 
)

Definition at line 282 of file nisplus-service.c.

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static int _nss_nisplus_parse_servent ( nis_result *  result,
struct servent serv,
char *  buffer,
size_t  buflen,
int errnop 
) [static]

Definition at line 46 of file nisplus-service.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)->EN_data.en_type, "services_tbl") != 0
      || NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 4)
    return 0;

  if (NISENTRYLEN (0, 0, result) >= room_left)
    {
    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';
  serv->s_name = first_unused;
  size_t len = strlen (first_unused) + 1;
  room_left -= len;
  first_unused += len;

  if (NISENTRYLEN (0, 2, result) >= room_left)
    goto no_more_room;
  strncpy (first_unused, NISENTRYVAL (0, 2, result),
           NISENTRYLEN (0, 2, result));
  first_unused[NISENTRYLEN (0, 2, result)] = '\0';
  serv->s_proto = first_unused;
  len = strlen (first_unused) + 1;
  room_left -= len;
  first_unused += len;

  serv->s_port = htons (atoi (NISENTRYVAL (0, 3, 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), serv->s_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;
  serv->s_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 *);
      serv->s_aliases[i++] = line;

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

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

  return 1;
}

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Definition at line 177 of file nisplus-service.c.

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static enum nss_status internal_nisplus_getservent_r ( struct servent serv,
char *  buffer,
size_t  buflen,
int errnop 
) [static]

Definition at line 215 of file nisplus-service.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)
           return niserr2nss (result->status);
       }
      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)
           {
             nis_freeresult (saved_res);
             return niserr2nss (result->status);
           }
       }

      parse_res = _nss_nisplus_parse_servent (result, serv, buffer,
                                         buflen, errnop);
      if (__builtin_expect (parse_res == -1, 0))
       {
         nis_freeresult (result);
         result = saved_res;
         *errnop = ERANGE;
         return NSS_STATUS_TRYAGAIN;
       }
      else
       {
         if (saved_res)
           nis_freeresult (saved_res);
       }
    }
  while (!parse_res);

  return NSS_STATUS_SUCCESS;
}

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Variable Documentation

nis_result* result [static]

Definition at line 34 of file nisplus-service.c.

Definition at line 36 of file nisplus-service.c.

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