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-rw-r--r--nis/nss_compat/compat-grp.c421
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;
+}
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