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glibc  2.9
Classes | Defines | Typedefs | Functions | Variables
compat-grp.c File Reference
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <nss.h>
#include <nsswitch.h>
#include <stdio_ext.h>
#include <string.h>
#include <rpc/types.h>
#include <bits/libc-lock.h>
#include <kernel-features.h>
#include <nss/nss_files/files-parse.c>

Go to the source code of this file.

Classes

struct  blacklist_t
struct  ent_t

Defines

#define ENTNAME   grent
#define STRUCTURE   group
#define EXTERN_PARSER
#define BLACKLIST_INITIAL_SIZE   512
#define BLACKLIST_INCREMENT   256
#define __compat_have_cloexec   -1

Typedefs

typedef struct ent_t

Functions

 __libc_lock_define_initialized (static, lock)
static enum nss_status internal_setgrent (ent_t *ent, int stayopen, int needent)
enum nss_status _nss_compat_setgrent (int stayopen)
static enum nss_status internal_endgrent (ent_t *ent)
enum nss_status _nss_compat_endgrent (void)
static enum nss_status getgrent_next_nss (struct group *result, ent_t *ent, char *buffer, size_t buflen, int *errnop)
static enum nss_status getgrnam_plusgroup (const char *name, struct group *result, ent_t *ent, char *buffer, size_t buflen, int *errnop)
static enum nss_status getgrent_next_file (struct group *result, ent_t *ent, char *buffer, size_t buflen, int *errnop)
enum nss_status _nss_compat_getgrent_r (struct group *grp, char *buffer, size_t buflen, int *errnop)
static enum nss_status internal_getgrnam_r (const char *name, struct group *result, ent_t *ent, char *buffer, size_t buflen, int *errnop)
enum nss_status _nss_compat_getgrnam_r (const char *name, struct group *grp, char *buffer, size_t buflen, int *errnop)
static enum nss_status internal_getgrgid_r (gid_t gid, struct group *result, ent_t *ent, char *buffer, size_t buflen, int *errnop)
enum nss_status _nss_compat_getgrgid_r (gid_t gid, struct group *grp, char *buffer, size_t buflen, int *errnop)
static void blacklist_store_name (const char *name, ent_t *ent)
static bool_t in_blacklist (const char *name, int namelen, ent_t *ent)

Variables

static service_userni
static enum nss_status(* nss_setgrent )(int stayopen)
static enum nss_status(* nss_getgrnam_r )(const char *name, struct group *grp, char *buffer, size_t buflen, int *errnop)
static enum nss_status(* nss_getgrgid_r )(gid_t gid, struct group *grp, char *buffer, size_t buflen, int *errnop)
static enum nss_status(* nss_getgrent_r )(struct group *grp, char *buffer, size_t buflen, int *errnop)
static enum nss_status(* nss_endgrent )(void)
static ent_t ext_ent = { TRUE, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }}

Class Documentation

struct blacklist_t

Definition at line 53 of file compat-grp.c.

Class Members
int current
char * data
int size
struct ent_t

Definition at line 60 of file compat-grp.c.

Class Members
enum nss_status FILE *stream struct blacklist_t
bool_t files
bool files
bool first
bool netgroup
FILE * stream

Define Documentation

#define __compat_have_cloexec   -1
#define BLACKLIST_INCREMENT   256

Definition at line 52 of file compat-grp.c.

#define BLACKLIST_INITIAL_SIZE   512

Definition at line 51 of file compat-grp.c.

#define ENTNAME   grent

Definition at line 45 of file compat-grp.c.

#define EXTERN_PARSER

Definition at line 47 of file compat-grp.c.

#define STRUCTURE   group

Definition at line 46 of file compat-grp.c.


Typedef Documentation

typedef struct ent_t

Definition at line 67 of file compat-grp.c.


Function Documentation

__libc_lock_define_initialized ( static  ,
lock   
)

Definition at line 72 of file compat-grp.c.

{
  if (__nss_database_lookup ("group_compat", NULL, "nis", &ni) >= 0)
    {
      nss_setgrent = __nss_lookup_function (ni, "setgrent");
      nss_getgrnam_r = __nss_lookup_function (ni, "getgrnam_r");
      nss_getgrgid_r = __nss_lookup_function (ni, "getgrgid_r");
      nss_getgrent_r = __nss_lookup_function (ni, "getgrent_r");
      nss_endgrent = __nss_lookup_function (ni, "endgrent");
    }
}

Definition at line 220 of file compat-grp.c.

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enum nss_status _nss_compat_getgrent_r ( struct group grp,
char *  buffer,
size_t  buflen,
int errnop 
)

Definition at line 384 of file compat-grp.c.

{
  enum nss_status result = NSS_STATUS_SUCCESS;

  __libc_lock_lock (lock);

  /* Be prepared that the setgrent function was not called before.  */
  if (ni == NULL)
    init_nss_interface ();

  if (ext_ent.stream == NULL)
    result = internal_setgrent (&ext_ent, 1, 1);

  if (result == NSS_STATUS_SUCCESS)
    {
      if (ext_ent.files)
       result = getgrent_next_file (grp, &ext_ent, buffer, buflen, errnop);
      else
       result = getgrent_next_nss (grp, &ext_ent, buffer, buflen, errnop);
    }
  __libc_lock_unlock (lock);

  return result;
}

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enum nss_status _nss_compat_getgrgid_r ( gid_t  gid,
struct group grp,
char *  buffer,
size_t  buflen,
int errnop 
)

Definition at line 647 of file compat-grp.c.

{
  ent_t ent = { TRUE, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }};
  enum nss_status result;

  __libc_lock_lock (lock);

  if (ni == NULL)
    init_nss_interface ();

  __libc_lock_unlock (lock);

  result = internal_setgrent (&ent, 0, 0);

  if (result == NSS_STATUS_SUCCESS)
    result = internal_getgrgid_r (gid, grp, &ent, buffer, buflen, errnop);

  internal_endgrent (&ent);

  return result;
}

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enum nss_status _nss_compat_getgrnam_r ( const char *  name,
struct group grp,
char *  buffer,
size_t  buflen,
int errnop 
)

Definition at line 515 of file compat-grp.c.

{
  ent_t ent = { TRUE, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }};
  enum nss_status result;

  if (name[0] == '-' || name[0] == '+')
    return NSS_STATUS_NOTFOUND;

  __libc_lock_lock (lock);

  if (ni == NULL)
    init_nss_interface ();

  __libc_lock_unlock (lock);

  result = internal_setgrent (&ent, 0, 0);

  if (result == NSS_STATUS_SUCCESS)
    result = internal_getgrnam_r (name, grp, &ent, buffer, buflen, errnop);

  internal_endgrent (&ent);

  return result;
}

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enum nss_status _nss_compat_setgrent ( int  stayopen)

Definition at line 178 of file compat-grp.c.

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static void blacklist_store_name ( const char *  name,
ent_t ent 
) [static]

Definition at line 674 of file compat-grp.c.

{
  int namelen = strlen (name);
  char *tmp;

  /* first call, setup cache */
  if (ent->blacklist.size == 0)
    {
      ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
      ent->blacklist.data = malloc (ent->blacklist.size);
      if (ent->blacklist.data == NULL)
       return;
      ent->blacklist.data[0] = '|';
      ent->blacklist.data[1] = '\0';
      ent->blacklist.current = 1;
    }
  else
    {
      if (in_blacklist (name, namelen, ent))
       return;                     /* no duplicates */

      if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size)
       {
         ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen);
         tmp = realloc (ent->blacklist.data, ent->blacklist.size);
         if (tmp == NULL)
           {
             free (ent->blacklist.data);
             ent->blacklist.size = 0;
             return;
           }
         ent->blacklist.data = tmp;
       }
    }

  tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name);
  *tmp++ = '|';
  *tmp = '\0';
  ent->blacklist.current += namelen + 1;

  return;
}

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static enum nss_status getgrent_next_file ( struct group result,
ent_t ent,
char *  buffer,
size_t  buflen,
int errnop 
) [static]

Definition at line 279 of file compat-grp.c.

{
  struct parser_data *data = (void *) buffer;
  while (1)
    {
      fpos_t pos;
      int parse_res = 0;
      char *p;

      do
       {
         /* We need at least 3 characters for one line.  */
         if (__builtin_expect (buflen < 3, 0))
           {
           erange:
             *errnop = ERANGE;
             return NSS_STATUS_TRYAGAIN;
           }

         fgetpos (ent->stream, &pos);
         buffer[buflen - 1] = '\xff';
         p = fgets_unlocked (buffer, buflen, ent->stream);
         if (p == NULL && feof_unlocked (ent->stream))
           return NSS_STATUS_NOTFOUND;

         if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0))
           {
           erange_reset:
             fsetpos (ent->stream, &pos);
             goto erange;
           }

         /* Terminate the line for any case.  */
         buffer[buflen - 1] = '\0';

         /* Skip leading blanks.  */
         while (isspace (*p))
           ++p;
       }
      while (*p == '\0' || *p == '#' ||   /* Ignore empty and comment lines. */
            /* Parse the line.  If it is invalid, loop to
               get the next line of the file to parse.  */
            !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
                                             errnop)));

      if (__builtin_expect (parse_res == -1, 0))
       /* The parser ran out of space.  */
       goto erange_reset;

      if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
       /* This is a real entry.  */
       break;

      /* -group */
      if (result->gr_name[0] == '-' && result->gr_name[1] != '\0'
         && result->gr_name[1] != '@')
       {
         blacklist_store_name (&result->gr_name[1], ent);
         continue;
       }

      /* +group */
      if (result->gr_name[0] == '+' && result->gr_name[1] != '\0'
         && result->gr_name[1] != '@')
       {
         size_t len = strlen (result->gr_name);
         char buf[len];
         enum nss_status status;

         /* Store the group in the blacklist for the "+" at the end of
            /etc/group */
         memcpy (buf, &result->gr_name[1], len);
         status = getgrnam_plusgroup (&result->gr_name[1], result, ent,
                                   buffer, buflen, errnop);
         blacklist_store_name (buf, ent);
         if (status == NSS_STATUS_SUCCESS)       /* We found the entry. */
           break;
         else if (status == NSS_STATUS_RETURN /* We couldn't parse the entry*/
                 || status == NSS_STATUS_NOTFOUND)      /* No group in NIS */
           continue;
         else
           {
             if (status == NSS_STATUS_TRYAGAIN)
              /* The parser ran out of space.  */
              goto erange_reset;

             return status;
           }
       }

      /* +:... */
      if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
       {
         ent->files = FALSE;

         return getgrent_next_nss (result, ent, buffer, buflen, errnop);
       }
    }

  return NSS_STATUS_SUCCESS;
}

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static enum nss_status getgrent_next_nss ( struct group result,
ent_t ent,
char *  buffer,
size_t  buflen,
int errnop 
) [static]

Definition at line 235 of file compat-grp.c.

{
  if (!nss_getgrent_r)
    return NSS_STATUS_UNAVAIL;

  /* If the setgrent call failed, say so.  */
  if (ent->setent_status != NSS_STATUS_SUCCESS)
    return ent->setent_status;

  do
    {
      enum nss_status status;

      if ((status = nss_getgrent_r (result, buffer, buflen, errnop)) !=
         NSS_STATUS_SUCCESS)
       return status;
    }
  while (in_blacklist (result->gr_name, strlen (result->gr_name), ent));

  return NSS_STATUS_SUCCESS;
}

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static enum nss_status getgrnam_plusgroup ( const char *  name,
struct group result,
ent_t ent,
char *  buffer,
size_t  buflen,
int errnop 
) [static]

Definition at line 260 of file compat-grp.c.

{
  if (!nss_getgrnam_r)
    return NSS_STATUS_UNAVAIL;

  enum nss_status status = nss_getgrnam_r (name, result, buffer, buflen,
                                      errnop);
  if (status != NSS_STATUS_SUCCESS)
    return status;

  if (in_blacklist (result->gr_name, strlen (result->gr_name), ent))
    return NSS_STATUS_NOTFOUND;

  /* We found the entry.  */
  return NSS_STATUS_SUCCESS;
}

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static bool_t in_blacklist ( const char *  name,
int  namelen,
ent_t ent 
) [static]

Definition at line 719 of file compat-grp.c.

{
  char buf[namelen + 3];
  char *cp;

  if (ent->blacklist.data == NULL)
    return FALSE;

  buf[0] = '|';
  cp = stpcpy (&buf[1], name);
  *cp++ = '|';
  *cp = '\0';
  return strstr (ent->blacklist.data, buf) != NULL;
}

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static enum nss_status internal_endgrent ( ent_t ent) [static]

Definition at line 196 of file compat-grp.c.

{
  if (nss_endgrent)
    nss_endgrent ();

  if (ent->stream != NULL)
    {
      fclose (ent->stream);
      ent->stream = NULL;
    }

  if (ent->blacklist.data != NULL)
    {
      ent->blacklist.current = 1;
      ent->blacklist.data[0] = '|';
      ent->blacklist.data[1] = '\0';
    }
  else
    ent->blacklist.current = 0;

  return NSS_STATUS_SUCCESS;
}

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static enum nss_status internal_getgrgid_r ( gid_t  gid,
struct group result,
ent_t ent,
char *  buffer,
size_t  buflen,
int errnop 
) [static]

Definition at line 543 of file compat-grp.c.

{
  struct parser_data *data = (void *) buffer;
  while (1)
    {
      fpos_t pos;
      int parse_res = 0;
      char *p;

      do
       {
         /* We need at least 3 characters for one line.  */
         if (__builtin_expect (buflen < 3, 0))
           {
           erange:
             *errnop = ERANGE;
             return NSS_STATUS_TRYAGAIN;
           }

         fgetpos (ent->stream, &pos);
         buffer[buflen - 1] = '\xff';
         p = fgets_unlocked (buffer, buflen, ent->stream);
         if (p == NULL && feof_unlocked (ent->stream))
           return NSS_STATUS_NOTFOUND;

         if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0))
           {
           erange_reset:
             fsetpos (ent->stream, &pos);
             goto erange;
           }

         /* Terminate the line for any case.  */
         buffer[buflen - 1] = '\0';

         /* Skip leading blanks.  */
         while (isspace (*p))
           ++p;
       }
      while (*p == '\0' || *p == '#' ||   /* Ignore empty and comment lines. */
            /* Parse the line.  If it is invalid, loop to
               get the next line of the file to parse.  */
            !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
                                             errnop)));

      if (__builtin_expect (parse_res == -1, 0))
       /* The parser ran out of space.  */
       goto erange_reset;

      /* This is a real entry.  */
      if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
       {
         if (result->gr_gid == gid)
           return NSS_STATUS_SUCCESS;
         else
           continue;
       }

      /* -group */
      if (result->gr_name[0] == '-' && result->gr_name[1] != '\0')
       {
         blacklist_store_name (&result->gr_name[1], ent);
         continue;
       }

      /* +group */
      if (result->gr_name[0] == '+' && result->gr_name[1] != '\0')
       {
         /* Yes, no +1, see the memcpy call below.  */
         size_t len = strlen (result->gr_name);
         char buf[len];
         enum nss_status status;

         /* Store the group in the blacklist for the "+" at the end of
            /etc/group */
         memcpy (buf, &result->gr_name[1], len);
         status = getgrnam_plusgroup (&result->gr_name[1], result, ent,
                                   buffer, buflen, errnop);
         blacklist_store_name (buf, ent);
         if (status == NSS_STATUS_SUCCESS && result->gr_gid == gid)
           break;
         else
           continue;
       }
      /* +:... */
      if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
       {
         if (!nss_getgrgid_r)
           return NSS_STATUS_UNAVAIL;

         enum nss_status status = nss_getgrgid_r (gid, result, buffer, buflen,
                                             errnop);
         if (status == NSS_STATUS_RETURN) /* We couldn't parse the entry */
           return NSS_STATUS_NOTFOUND;
         else
           return status;
       }
    }

  return NSS_STATUS_SUCCESS;
}

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static enum nss_status internal_getgrnam_r ( const char *  name,
struct group result,
ent_t ent,
char *  buffer,
size_t  buflen,
int errnop 
) [static]

Definition at line 412 of file compat-grp.c.

{
  struct parser_data *data = (void *) buffer;
  while (1)
    {
      fpos_t pos;
      int parse_res = 0;
      char *p;

      do
       {
         /* We need at least 3 characters for one line.  */
         if (__builtin_expect (buflen < 3, 0))
           {
           erange:
             *errnop = ERANGE;
             return NSS_STATUS_TRYAGAIN;
           }

         fgetpos (ent->stream, &pos);
         buffer[buflen - 1] = '\xff';
         p = fgets_unlocked (buffer, buflen, ent->stream);
         if (p == NULL && feof_unlocked (ent->stream))
           return NSS_STATUS_NOTFOUND;

         if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0))
           {
           erange_reset:
             fsetpos (ent->stream, &pos);
             goto erange;
           }

         /* Terminate the line for any case.  */
         buffer[buflen - 1] = '\0';

         /* Skip leading blanks.  */
         while (isspace (*p))
           ++p;
       }
      while (*p == '\0' || *p == '#' ||   /* Ignore empty and comment lines. */
            /* Parse the line.  If it is invalid, loop to
               get the next line of the file to parse.  */
            !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
                                             errnop)));

      if (__builtin_expect (parse_res == -1, 0))
       /* The parser ran out of space.  */
       goto erange_reset;

      /* This is a real entry.  */
      if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
       {
         if (strcmp (result->gr_name, name) == 0)
           return NSS_STATUS_SUCCESS;
         else
           continue;
       }

      /* -group */
      if (result->gr_name[0] == '-' && result->gr_name[1] != '\0')
       {
         if (strcmp (&result->gr_name[1], name) == 0)
           return NSS_STATUS_NOTFOUND;
         else
           continue;
       }

      /* +group */
      if (result->gr_name[0] == '+' && result->gr_name[1] != '\0')
       {
         if (strcmp (name, &result->gr_name[1]) == 0)
           {
             enum nss_status status;

             status = getgrnam_plusgroup (name, result, ent,
                                      buffer, buflen, errnop);
             if (status == NSS_STATUS_RETURN)
              /* We couldn't parse the entry */
              continue;
             else
              return status;
           }
       }
      /* +:... */
      if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
       {
         enum nss_status status;

         status = getgrnam_plusgroup (name, result, ent,
                                   buffer, buflen, errnop);
         if (status == NSS_STATUS_RETURN)
           /* We couldn't parse the entry */
           continue;
         else
           return status;
       }
    }

  return NSS_STATUS_SUCCESS;
}

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static enum nss_status internal_setgrent ( ent_t ent,
int  stayopen,
int  needent 
) [static]

Definition at line 107 of file compat-grp.c.

{
  enum nss_status status = NSS_STATUS_SUCCESS;

  ent->files = TRUE;

  if (ent->blacklist.data != NULL)
    {
      ent->blacklist.current = 1;
      ent->blacklist.data[0] = '|';
      ent->blacklist.data[1] = '\0';
    }
  else
    ent->blacklist.current = 0;

  if (ent->stream == NULL)
    {
      ent->stream = fopen ("/etc/group", "rme");

      if (ent->stream == NULL)
       status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
      else
       {
         /* We have to make sure the file is  `closed on exec'.  */
         int result = 0;

         if (__compat_have_cloexec <= 0)
           {
             int flags;
             result = flags = fcntl (fileno_unlocked (ent->stream), F_GETFD,
                                  0);
             if (result >= 0)
              {
#if defined O_CLOEXEC && !defined __ASSUME_O_CLOEXEC
                if (__compat_have_cloexec == 0)
                  __compat_have_cloexec = (flags & FD_CLOEXEC) ? 1 : -1;

                if (__compat_have_cloexec < 0)
#endif
                  {
                    flags |= FD_CLOEXEC;
                    result = fcntl (fileno_unlocked (ent->stream), F_SETFD,
                                  flags);
                  }
              }
           }

         if (result < 0)
           {
             /* Something went wrong.  Close the stream and return a
                failure.  */
             fclose (ent->stream);
             ent->stream = NULL;
             status = NSS_STATUS_UNAVAIL;
           }
         else
           /* We take care of locking ourself.  */
           __fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
       }
    }
  else
    rewind (ent->stream);

  if (needent && status == NSS_STATUS_SUCCESS && nss_setgrent)
    ent->setent_status = nss_setgrent (stayopen);

  return status;
}

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Variable Documentation

ent_t ext_ent = { TRUE, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }} [static]

Definition at line 69 of file compat-grp.c.

service_user* ni [static]

Definition at line 32 of file compat-grp.c.

enum nss_status(* nss_endgrent)(void) [static]

Definition at line 42 of file compat-grp.c.

enum nss_status(* nss_getgrent_r)(struct group *grp, char *buffer, size_t buflen, int *errnop) [static]

Definition at line 40 of file compat-grp.c.

enum nss_status(* nss_getgrgid_r)(gid_t gid, struct group *grp, char *buffer, size_t buflen, int *errnop) [static]

Definition at line 37 of file compat-grp.c.

enum nss_status(* nss_getgrnam_r)(const char *name, struct group *grp, char *buffer, size_t buflen, int *errnop) [static]

Definition at line 34 of file compat-grp.c.

enum nss_status(* nss_setgrent)(int stayopen) [static]

Definition at line 33 of file compat-grp.c.