1 files changed, 421 insertions, 0 deletions
diff --git a/nis/nss_compat/compat-grp.c b/nis/nss_compat/compat-grp.c
new file mode 100644
index 0000000000..0b4ed40e59
--- /dev/null
+++ b/nis/nss_compat/compat-grp.c
@@ -0,0 +1,421 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1996.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <nss.h>
+#include <grp.h>
+#include <ctype.h>
+#include <libc-lock.h>
+#include <string.h>
+#include <rpcsvc/yp.h>
+#include <rpcsvc/ypclnt.h>
+
+/* Structure for remembering -@netgroup and -user members ... */
+#define BLACKLIST_INITIAL_SIZE 512
+#define BLACKLIST_INCREMENT 256
+struct blacklist_t
+  {
+    char *data;
+    int current;
+    int size;
+  };
+
+struct ent_t
+  {
+    bool_t nis;
+    bool_t nis_first;
+    char *oldkey;
+    int oldkeylen;
+    FILE *stream;
+    struct blacklist_t blacklist;
+  };
+typedef struct ent_t ent_t;
+
+static ent_t ext_ent = {0, 0, NULL, 0, NULL, {NULL, 0, 0}};
+
+/* Protect global state against multiple changers.  */
+__libc_lock_define_initialized (static, lock)
+
+/* Prototypes for local functions.  */
+static void blacklist_store_name (const char *, ent_t *);
+static int in_blacklist (const char *, int, ent_t *);
+
+static enum nss_status
+internal_setgrent (ent_t *ent)
+{
+  enum nss_status status = NSS_STATUS_SUCCESS;
+
+  ent->nis = ent->nis_first = 0;
+
+  if (ent->oldkey != NULL)
+    {
+      free (ent->oldkey);
+      ent->oldkey = NULL;
+      ent->oldkeylen = 0;
+    }
+
+  ent->blacklist.current = 0;
+  if (ent->blacklist.data != NULL)
+    ent->blacklist.data[0] = '\0';
+
+  if (ent->stream == NULL)
+    {
+      ent->stream = fopen ("/etc/group", "r");
+
+      if (ent->stream == NULL)
+	status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
+    }
+  else
+    rewind (ent->stream);
+
+  return status;
+}
+
+
+enum nss_status
+_nss_compat_setgrent (void)
+{
+  enum nss_status result;
+
+  __libc_lock_lock (lock);
+
+  result = internal_setgrent (&ext_ent);
+
+  __libc_lock_unlock (lock);
+
+  return result;
+}
+
+
+static enum nss_status
+internal_endgrent (ent_t *ent)
+{
+  if (ent->stream != NULL)
+    {
+      fclose (ent->stream);
+      ent->stream = NULL;
+    }
+
+  ent->nis = ent->nis_first = 0;
+
+  if (ent->oldkey != NULL)
+    {
+      free (ent->oldkey);
+      ent->oldkey = NULL;
+      ent->oldkeylen = 0;
+    }
+
+  ent->blacklist.current = 0;
+  if (ent->blacklist.data != NULL)
+    ent->blacklist.data[0] = '\0';
+
+  return NSS_STATUS_SUCCESS;
+}
+
+enum nss_status
+_nss_compat_endgrent (void)
+{
+  enum nss_status result;
+
+  __libc_lock_lock (lock);
+
+  result = internal_endgrent (&ext_ent);
+
+  __libc_lock_unlock (lock);
+
+  return result;
+}
+
+static enum nss_status
+getgrent_next_nis (struct group *result, ent_t *ent, char *buffer,
+		   size_t buflen)
+{
+  char *domain;
+  char *outkey, *outval;
+  int outkeylen, outvallen;
+  char *p;
+
+  if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
+    {
+      ent->nis = 0;
+      return NSS_STATUS_NOTFOUND;
+    }
+
+  do
+    {
+      if (ent->nis_first)
+	{
+	  if (yp_first (domain, "group.byname", &outkey, &outkeylen,
+			&outval, &outvallen) != YPERR_SUCCESS)
+	    {
+	      ent->nis = 0;
+	      return NSS_STATUS_UNAVAIL;
+	    }
+
+	  ent->oldkey = outkey;
+	  ent->oldkeylen = outkeylen;
+	  ent->nis_first = FALSE;
+	}
+      else
+	{
+	  if (yp_next (domain, "group.byname", ent->oldkey, ent->oldkeylen,
+		       &outkey, &outkeylen, &outval, &outvallen)
+	      != YPERR_SUCCESS)
+	    {
+	      ent->nis = 0;
+	      return NSS_STATUS_NOTFOUND;
+	    }
+
+	  free (ent->oldkey);
+	  ent->oldkey = outkey;
+	  ent->oldkeylen = outkeylen;
+	}
+
+      /* Copy the found data to our buffer  */
+      p = strncpy (buffer, outval, buflen);
+
+      /* ...and free the data.  */
+      free (outval);
+
+      while (isspace (*p))
+	++p;
+    }
+  while (!_nss_files_parse_grent (p, result, buffer, buflen));
+
+  if (!in_blacklist (result->gr_name, strlen (result->gr_name), ent))
+    return NSS_STATUS_SUCCESS;
+  else
+    return NSS_STATUS_NOTFOUND;
+}
+
+
+static enum nss_status
+getgrent_next_file (struct group *result, ent_t *ent,
+		    char *buffer, size_t buflen)
+{
+  while (1)
+    {
+      char *p;
+
+      do
+	{
+	  p = fgets (buffer, buflen, ent->stream);
+	  if (p == NULL)
+	    return NSS_STATUS_NOTFOUND;
+
+	  /* Terminate the line for any case.  */
+	  buffer[buflen - 1] = '\0';
+
+	  /* Skip leading blanks.  */
+	  while (isspace (*p))
+	    ++p;
+	}
+      /* Ignore empty and comment lines.  */
+      while (*p == '\0' || *p == '#' ||
+      /* Parse the line.  If it is invalid, loop to
+         get the next line of the file to parse.  */
+	     !_nss_files_parse_grent (p, result, buffer, buflen));
+
+      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] != '@')
+	{
+	  char *domain;
+	  char *outval;
+	  int outvallen;
+
+	  if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
+	    /* XXX Should we regard this as an fatal error?  I don't
+	       think so.  Just continue working.  --drepper@gnu  */
+	    continue;
+
+	  if (yp_match (domain, "group.byname", &result->gr_name[1],
+			strlen (result->gr_name) - 1, &outval, &outvallen)
+	      != YPERR_SUCCESS)
+	    continue;
+
+	  p = strncpy (buffer, outval, buflen);
+	  while (isspace (*p))
+	    p++;
+	  free (outval);
+	  if (_nss_files_parse_grent (p, result, buffer, buflen))
+	    /* We found the entry.  */
+	    break;
+	}
+
+      /* +:... */
+      if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
+	{
+	  ent->nis = TRUE;
+	  ent->nis_first = TRUE;
+
+	  return getgrent_next_nis (result, ent, buffer, buflen);
+	}
+    }
+
+  return NSS_STATUS_SUCCESS;
+}
+
+
+static enum nss_status
+internal_getgrent_r (struct group *gr, ent_t *ent, char *buffer,
+		     size_t buflen)
+{
+  if (ent->nis)
+    return getgrent_next_nis (gr, ent, buffer, buflen);
+  else
+    return getgrent_next_file (gr, ent, buffer, buflen);
+}
+
+enum nss_status
+_nss_compat_getgrent_r (struct group *grp, char *buffer, size_t buflen)
+{
+  enum nss_status status = NSS_STATUS_SUCCESS;
+
+  __libc_lock_lock (lock);
+
+  /* Be prepared that the setgrent function was not called before.  */
+  if (ext_ent.stream == NULL)
+    status = internal_setgrent (&ext_ent);
+
+  if (status == NSS_STATUS_SUCCESS)
+    status = internal_getgrent_r (grp, &ext_ent, buffer, buflen);
+
+  __libc_lock_unlock (lock);
+
+  return status;
+}
+
+
+enum nss_status
+_nss_compat_getgrnam_r (const char *name, struct group *grp,
+			char *buffer, size_t buflen)
+{
+  ent_t ent = {0, 0, NULL, 0, NULL, {NULL, 0, 0}};
+  enum nss_status status;
+
+  if (name[0] == '-' || name[0] == '+')
+    return NSS_STATUS_NOTFOUND;
+
+
+  status = internal_setgrent (&ent);
+  if (status != NSS_STATUS_SUCCESS)
+    return status;
+
+  while ((status = internal_getgrent_r (grp, &ent, buffer, buflen))
+	 == NSS_STATUS_SUCCESS)
+    if (strcmp (grp->gr_name, name) == 0)
+      break;
+
+  internal_endgrent (&ent);
+  return status;
+}
+
+
+enum nss_status
+_nss_compat_getgrgid_r (gid_t gid, struct group *grp,
+			char *buffer, size_t buflen)
+{
+  ent_t ent = {0, 0, NULL, 0, NULL, {NULL, 0, 0}};
+  enum nss_status status;
+
+  status = internal_setgrent (&ent);
+  if (status != NSS_STATUS_SUCCESS)
+    return status;
+
+  while ((status = internal_getgrent_r (grp, &ent, buffer, buflen))
+	 == NSS_STATUS_SUCCESS)
+    if (grp->gr_gid == gid && grp->gr_name[0] != '+' && grp->gr_name[0] != '-')
+      break;
+
+  internal_endgrent (&ent);
+  return status;
+}
+
+
+/* Support routines for remembering -@netgroup and -user entries.
+   The names are stored in a single string with `|' as separator. */
+static void
+blacklist_store_name (const char *name, ent_t *ent)
+{
+  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;
+}
+
+/* returns TRUE if ent->blacklist contains name, else FALSE */
+static bool_t
+in_blacklist (const char *name, int namelen, ent_t *ent)
+{
+  char buf[namelen + 3];
+
+  if (ent->blacklist.data == NULL)
+    return FALSE;
+
+  stpcpy (stpcpy (stpcpy (buf, "|"), name), "|");
+  return strstr (ent->blacklist.data, buf) != NULL;
+}