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-rw-r--r--REORG.TODO/nis/nss_compat/compat-spwd.c858
1 files changed, 858 insertions, 0 deletions
diff --git a/REORG.TODO/nis/nss_compat/compat-spwd.c b/REORG.TODO/nis/nss_compat/compat-spwd.c
new file mode 100644
index 0000000000..eec3af3d15
--- /dev/null
+++ b/REORG.TODO/nis/nss_compat/compat-spwd.c
@@ -0,0 +1,858 @@
+/* Copyright (C) 1996-2017 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 Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <nss.h>
+#include <nsswitch.h>
+#include <shadow.h>
+#include <stdio_ext.h>
+#include <string.h>
+#include <rpc/types.h>
+#include <rpcsvc/ypclnt.h>
+#include <libc-lock.h>
+#include <kernel-features.h>
+
+#include "netgroup.h"
+
+static service_user *ni;
+static enum nss_status (*nss_setspent) (int stayopen);
+static enum nss_status (*nss_getspnam_r) (const char *name, struct spwd * sp,
+ char *buffer, size_t buflen,
+ int *errnop);
+static enum nss_status (*nss_getspent_r) (struct spwd * sp, char *buffer,
+ size_t buflen, int *errnop);
+static enum nss_status (*nss_endspent) (void);
+
+/* Get the declaration of the parser function. */
+#define ENTNAME spent
+#define STRUCTURE spwd
+#define EXTERN_PARSER
+#include <nss/nss_files/files-parse.c>
+
+/* 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 netgroup;
+ bool files;
+ bool first;
+ enum nss_status setent_status;
+ FILE *stream;
+ struct blacklist_t blacklist;
+ struct spwd pwd;
+ struct __netgrent netgrdata;
+};
+typedef struct ent_t ent_t;
+
+static ent_t ext_ent = { false, true, false, NSS_STATUS_SUCCESS, NULL,
+ { NULL, 0, 0},
+ { NULL, NULL, 0, 0, 0, 0, 0, 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 *);
+
+/* Initialize the NSS interface/functions. The calling function must
+ hold the lock. */
+static void
+init_nss_interface (void)
+{
+ if (__nss_database_lookup ("shadow_compat", "passwd_compat",
+ "nis", &ni) >= 0)
+ {
+ nss_setspent = __nss_lookup_function (ni, "setspent");
+ nss_getspnam_r = __nss_lookup_function (ni, "getspnam_r");
+ nss_getspent_r = __nss_lookup_function (ni, "getspent_r");
+ nss_endspent = __nss_lookup_function (ni, "endspent");
+ }
+}
+
+static void
+give_spwd_free (struct spwd *pwd)
+{
+ free (pwd->sp_namp);
+ free (pwd->sp_pwdp);
+
+ memset (pwd, '\0', sizeof (struct spwd));
+ pwd->sp_warn = -1;
+ pwd->sp_inact = -1;
+ pwd->sp_expire = -1;
+ pwd->sp_flag = ~0ul;
+}
+
+static int
+spwd_need_buflen (struct spwd *pwd)
+{
+ int len = 0;
+
+ if (pwd->sp_pwdp != NULL)
+ len += strlen (pwd->sp_pwdp) + 1;
+
+ return len;
+}
+
+static void
+copy_spwd_changes (struct spwd *dest, struct spwd *src,
+ char *buffer, size_t buflen)
+{
+ if (src->sp_pwdp != NULL && strlen (src->sp_pwdp))
+ {
+ if (buffer == NULL)
+ dest->sp_pwdp = strdup (src->sp_pwdp);
+ else if (dest->sp_pwdp &&
+ strlen (dest->sp_pwdp) >= strlen (src->sp_pwdp))
+ strcpy (dest->sp_pwdp, src->sp_pwdp);
+ else
+ {
+ dest->sp_pwdp = buffer;
+ strcpy (dest->sp_pwdp, src->sp_pwdp);
+ buffer += strlen (dest->sp_pwdp) + 1;
+ buflen = buflen - (strlen (dest->sp_pwdp) + 1);
+ }
+ }
+ if (src->sp_lstchg != 0)
+ dest->sp_lstchg = src->sp_lstchg;
+ if (src->sp_min != 0)
+ dest->sp_min = src->sp_min;
+ if (src->sp_max != 0)
+ dest->sp_max = src->sp_max;
+ if (src->sp_warn != -1)
+ dest->sp_warn = src->sp_warn;
+ if (src->sp_inact != -1)
+ dest->sp_inact = src->sp_inact;
+ if (src->sp_expire != -1)
+ dest->sp_expire = src->sp_expire;
+ if (src->sp_flag != ~0ul)
+ dest->sp_flag = src->sp_flag;
+}
+
+static enum nss_status
+internal_setspent (ent_t *ent, int stayopen, int needent)
+{
+ enum nss_status status = NSS_STATUS_SUCCESS;
+
+ ent->first = ent->netgroup = 0;
+ ent->files = true;
+
+ /* If something was left over free it. */
+ if (ent->netgroup)
+ __internal_endnetgrent (&ent->netgrdata);
+
+ 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/shadow", "rme");
+
+ if (ent->stream == NULL)
+ status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
+ else
+ /* We take care of locking ourself. */
+ __fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
+ }
+ else
+ rewind (ent->stream);
+
+ give_spwd_free (&ent->pwd);
+
+ if (needent && status == NSS_STATUS_SUCCESS && nss_setspent)
+ ent->setent_status = nss_setspent (stayopen);
+
+ return status;
+}
+
+
+enum nss_status
+_nss_compat_setspent (int stayopen)
+{
+ enum nss_status result;
+
+ __libc_lock_lock (lock);
+
+ if (ni == NULL)
+ init_nss_interface ();
+
+ result = internal_setspent (&ext_ent, stayopen, 1);
+
+ __libc_lock_unlock (lock);
+
+ return result;
+}
+
+
+static enum nss_status
+internal_endspent (ent_t *ent)
+{
+ if (ent->stream != NULL)
+ {
+ fclose (ent->stream);
+ ent->stream = NULL;
+ }
+
+ if (ent->netgroup)
+ __internal_endnetgrent (&ent->netgrdata);
+
+ ent->first = ent->netgroup = false;
+ 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;
+
+ give_spwd_free (&ent->pwd);
+
+ return NSS_STATUS_SUCCESS;
+}
+
+enum nss_status
+_nss_compat_endspent (void)
+{
+ enum nss_status result;
+
+ __libc_lock_lock (lock);
+
+ if (nss_endspent)
+ nss_endspent ();
+
+ result = internal_endspent (&ext_ent);
+
+ __libc_lock_unlock (lock);
+
+ return result;
+}
+
+
+static enum nss_status
+getspent_next_nss_netgr (const char *name, struct spwd *result, ent_t *ent,
+ char *group, char *buffer, size_t buflen,
+ int *errnop)
+{
+ char *curdomain = NULL, *host, *user, *domain, *p2;
+ size_t p2len;
+
+ if (!nss_getspnam_r)
+ return NSS_STATUS_UNAVAIL;
+
+ /* If the setpwent call failed, say so. */
+ if (ent->setent_status != NSS_STATUS_SUCCESS)
+ return ent->setent_status;
+
+ if (ent->first)
+ {
+ memset (&ent->netgrdata, 0, sizeof (struct __netgrent));
+ __internal_setnetgrent (group, &ent->netgrdata);
+ ent->first = false;
+ }
+
+ while (1)
+ {
+ enum nss_status status;
+
+ status = __internal_getnetgrent_r (&host, &user, &domain,
+ &ent->netgrdata, buffer, buflen,
+ errnop);
+ if (status != 1)
+ {
+ __internal_endnetgrent (&ent->netgrdata);
+ ent->netgroup = false;
+ give_spwd_free (&ent->pwd);
+ return NSS_STATUS_RETURN;
+ }
+
+ if (user == NULL || user[0] == '-')
+ continue;
+
+ if (domain != NULL)
+ {
+ if (curdomain == NULL
+ && yp_get_default_domain (&curdomain) != YPERR_SUCCESS)
+ {
+ __internal_endnetgrent (&ent->netgrdata);
+ ent->netgroup = false;
+ give_spwd_free (&ent->pwd);
+ return NSS_STATUS_UNAVAIL;
+ }
+ if (strcmp (curdomain, domain) != 0)
+ continue;
+ }
+
+ /* If name != NULL, we are called from getpwnam */
+ if (name != NULL)
+ if (strcmp (user, name) != 0)
+ continue;
+
+ p2len = spwd_need_buflen (&ent->pwd);
+ if (p2len > buflen)
+ {
+ *errnop = ERANGE;
+ return NSS_STATUS_TRYAGAIN;
+ }
+ p2 = buffer + (buflen - p2len);
+ buflen -= p2len;
+
+ if (nss_getspnam_r (user, result, buffer, buflen, errnop) !=
+ NSS_STATUS_SUCCESS)
+ continue;
+
+ if (!in_blacklist (result->sp_namp, strlen (result->sp_namp), ent))
+ {
+ /* Store the User in the blacklist for possible the "+" at the
+ end of /etc/passwd */
+ blacklist_store_name (result->sp_namp, ent);
+ copy_spwd_changes (result, &ent->pwd, p2, p2len);
+ break;
+ }
+ }
+
+ return NSS_STATUS_SUCCESS;
+}
+
+
+static enum nss_status
+getspent_next_nss (struct spwd *result, ent_t *ent,
+ char *buffer, size_t buflen, int *errnop)
+{
+ enum nss_status status;
+ char *p2;
+ size_t p2len;
+
+ if (!nss_getspent_r)
+ return NSS_STATUS_UNAVAIL;
+
+ p2len = spwd_need_buflen (&ent->pwd);
+ if (p2len > buflen)
+ {
+ *errnop = ERANGE;
+ return NSS_STATUS_TRYAGAIN;
+ }
+ p2 = buffer + (buflen - p2len);
+ buflen -= p2len;
+ do
+ {
+ if ((status = nss_getspent_r (result, buffer, buflen, errnop)) !=
+ NSS_STATUS_SUCCESS)
+ return status;
+ }
+ while (in_blacklist (result->sp_namp, strlen (result->sp_namp), ent));
+
+ copy_spwd_changes (result, &ent->pwd, p2, p2len);
+
+ return NSS_STATUS_SUCCESS;
+}
+
+
+/* This function handle the +user entrys in /etc/shadow */
+static enum nss_status
+getspnam_plususer (const char *name, struct spwd *result, ent_t *ent,
+ char *buffer, size_t buflen, int *errnop)
+{
+ if (!nss_getspnam_r)
+ return NSS_STATUS_UNAVAIL;
+
+ struct spwd pwd;
+ memset (&pwd, '\0', sizeof (struct spwd));
+ pwd.sp_warn = -1;
+ pwd.sp_inact = -1;
+ pwd.sp_expire = -1;
+ pwd.sp_flag = ~0ul;
+
+ copy_spwd_changes (&pwd, result, NULL, 0);
+
+ size_t plen = spwd_need_buflen (&pwd);
+ if (plen > buflen)
+ {
+ *errnop = ERANGE;
+ return NSS_STATUS_TRYAGAIN;
+ }
+ char *p = buffer + (buflen - plen);
+ buflen -= plen;
+
+ enum nss_status status = nss_getspnam_r (name, result, buffer, buflen,
+ errnop);
+ if (status != NSS_STATUS_SUCCESS)
+ return status;
+
+ if (in_blacklist (result->sp_namp, strlen (result->sp_namp), ent))
+ return NSS_STATUS_NOTFOUND;
+
+ copy_spwd_changes (result, &pwd, p, plen);
+ give_spwd_free (&pwd);
+ /* We found the entry. */
+ return NSS_STATUS_SUCCESS;
+}
+
+
+static enum nss_status
+getspent_next_file (struct spwd *result, ent_t *ent,
+ char *buffer, size_t buflen, int *errnop)
+{
+ 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 (__glibc_unlikely (buflen < 3))
+ {
+ 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;
+ }
+
+ /* 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_spent (p, result, data,
+ buflen, errnop)));
+
+ if (__glibc_unlikely (parse_res == -1))
+ /* The parser ran out of space. */
+ goto erange_reset;
+
+ if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-')
+ /* This is a real entry. */
+ break;
+
+ /* -@netgroup */
+ if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@'
+ && result->sp_namp[2] != '\0')
+ {
+ /* XXX Do not use fixed length buffers. */
+ char buf2[1024];
+ char *user, *host, *domain;
+ struct __netgrent netgrdata;
+
+ memset (&netgrdata, 0, sizeof (struct __netgrent));
+ __internal_setnetgrent (&result->sp_namp[2], &netgrdata);
+ while (__internal_getnetgrent_r (&host, &user, &domain,
+ &netgrdata, buf2, sizeof (buf2),
+ errnop))
+ {
+ if (user != NULL && user[0] != '-')
+ blacklist_store_name (user, ent);
+ }
+ __internal_endnetgrent (&netgrdata);
+ continue;
+ }
+
+ /* +@netgroup */
+ if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@'
+ && result->sp_namp[2] != '\0')
+ {
+ int status;
+
+ ent->netgroup = true;
+ ent->first = true;
+ copy_spwd_changes (&ent->pwd, result, NULL, 0);
+
+ status = getspent_next_nss_netgr (NULL, result, ent,
+ &result->sp_namp[2],
+ buffer, buflen, errnop);
+ if (status == NSS_STATUS_RETURN)
+ continue;
+ else
+ return status;
+ }
+
+ /* -user */
+ if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0'
+ && result->sp_namp[1] != '@')
+ {
+ blacklist_store_name (&result->sp_namp[1], ent);
+ continue;
+ }
+
+ /* +user */
+ if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0'
+ && result->sp_namp[1] != '@')
+ {
+ size_t len = strlen (result->sp_namp);
+ char buf[len];
+ enum nss_status status;
+
+ /* Store the User in the blacklist for the "+" at the end of
+ /etc/passwd */
+ memcpy (buf, &result->sp_namp[1], len);
+ status = getspnam_plususer (&result->sp_namp[1], result, ent,
+ buffer, buflen, errnop);
+ blacklist_store_name (buf, ent);
+
+ if (status == NSS_STATUS_SUCCESS) /* We found the entry. */
+ break;
+ /* We couldn't parse the entry */
+ else if (status == NSS_STATUS_RETURN
+ /* entry doesn't exist */
+ || status == NSS_STATUS_NOTFOUND)
+ continue;
+ else
+ {
+ if (status == NSS_STATUS_TRYAGAIN)
+ {
+ fsetpos (ent->stream, &pos);
+ *errnop = ERANGE;
+ }
+ return status;
+ }
+ }
+
+ /* +:... */
+ if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0')
+ {
+ ent->files = false;
+ ent->first = true;
+ copy_spwd_changes (&ent->pwd, result, NULL, 0);
+
+ return getspent_next_nss (result, ent, buffer, buflen, errnop);
+ }
+ }
+
+ return NSS_STATUS_SUCCESS;
+}
+
+
+static enum nss_status
+internal_getspent_r (struct spwd *pw, ent_t *ent,
+ char *buffer, size_t buflen, int *errnop)
+{
+ if (ent->netgroup)
+ {
+ enum nss_status status;
+
+ /* We are searching members in a netgroup */
+ /* Since this is not the first call, we don't need the group name */
+ status = getspent_next_nss_netgr (NULL, pw, ent, NULL, buffer,
+ buflen, errnop);
+
+ if (status == NSS_STATUS_RETURN)
+ return getspent_next_file (pw, ent, buffer, buflen, errnop);
+ else
+ return status;
+ }
+ else if (ent->files)
+ return getspent_next_file (pw, ent, buffer, buflen, errnop);
+ else
+ return getspent_next_nss (pw, ent, buffer, buflen, errnop);
+}
+
+
+enum nss_status
+_nss_compat_getspent_r (struct spwd *pwd, char *buffer, size_t buflen,
+ int *errnop)
+{
+ enum nss_status result = NSS_STATUS_SUCCESS;
+
+ __libc_lock_lock (lock);
+
+ /* Be prepared that the setpwent function was not called before. */
+ if (ni == NULL)
+ init_nss_interface ();
+
+ if (ext_ent.stream == NULL)
+ result = internal_setspent (&ext_ent, 1, 1);
+
+ if (result == NSS_STATUS_SUCCESS)
+ result = internal_getspent_r (pwd, &ext_ent, buffer, buflen, errnop);
+
+ __libc_lock_unlock (lock);
+
+ return result;
+}
+
+
+/* Searches in /etc/passwd and the NIS/NIS+ map for a special user */
+static enum nss_status
+internal_getspnam_r (const char *name, struct spwd *result, ent_t *ent,
+ char *buffer, size_t buflen, int *errnop)
+{
+ struct parser_data *data = (void *) buffer;
+
+ while (1)
+ {
+ fpos_t pos;
+ char *p;
+ int parse_res;
+
+ do
+ {
+ /* We need at least 3 characters for one line. */
+ if (__glibc_unlikely (buflen < 3))
+ {
+ 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 || buffer[buflen - 1] != '\xff')
+ {
+ 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_spent (p, result, data, buflen,
+ errnop)));
+
+ if (__glibc_unlikely (parse_res == -1))
+ /* The parser ran out of space. */
+ goto erange_reset;
+
+ /* This is a real entry. */
+ if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-')
+ {
+ if (strcmp (result->sp_namp, name) == 0)
+ return NSS_STATUS_SUCCESS;
+ else
+ continue;
+ }
+
+ /* -@netgroup */
+ /* If the loaded NSS module does not support this service, add
+ all users from a +@netgroup entry to the blacklist, too. */
+ if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@'
+ && result->sp_namp[2] != '\0')
+ {
+ if (innetgr (&result->sp_namp[2], NULL, name, NULL))
+ return NSS_STATUS_NOTFOUND;
+ continue;
+ }
+
+ /* +@netgroup */
+ if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@'
+ && result->sp_namp[2] != '\0')
+ {
+ enum nss_status status;
+
+ if (innetgr (&result->sp_namp[2], NULL, name, NULL))
+ {
+ status = getspnam_plususer (name, result, ent, buffer,
+ buflen, errnop);
+
+ if (status == NSS_STATUS_RETURN)
+ continue;
+
+ return status;
+ }
+ continue;
+ }
+
+ /* -user */
+ if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0'
+ && result->sp_namp[1] != '@')
+ {
+ if (strcmp (&result->sp_namp[1], name) == 0)
+ return NSS_STATUS_NOTFOUND;
+ else
+ continue;
+ }
+
+ /* +user */
+ if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0'
+ && result->sp_namp[1] != '@')
+ {
+ if (strcmp (name, &result->sp_namp[1]) == 0)
+ {
+ enum nss_status status;
+
+ status = getspnam_plususer (name, result, ent,
+ buffer, buflen, errnop);
+
+ if (status == NSS_STATUS_RETURN)
+ /* We couldn't parse the entry */
+ return NSS_STATUS_NOTFOUND;
+ else
+ return status;
+ }
+ }
+
+ /* +:... */
+ if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0')
+ {
+ enum nss_status status;
+
+ status = getspnam_plususer (name, result, ent,
+ buffer, buflen, errnop);
+
+ if (status == NSS_STATUS_SUCCESS)
+ /* We found the entry. */
+ break;
+ else if (status == NSS_STATUS_RETURN)
+ /* We couldn't parse the entry */
+ return NSS_STATUS_NOTFOUND;
+ else
+ return status;
+ }
+ }
+ return NSS_STATUS_SUCCESS;
+}
+
+
+enum nss_status
+_nss_compat_getspnam_r (const char *name, struct spwd *pwd,
+ char *buffer, size_t buflen, int *errnop)
+{
+ enum nss_status result;
+ ent_t ent = { false, true, false, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0},
+ { NULL, NULL, 0, 0, 0, 0, 0, 0, 0}};
+
+ 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_setspent (&ent, 0, 0);
+
+ if (result == NSS_STATUS_SUCCESS)
+ result = internal_getspnam_r (name, pwd, &ent, buffer, buflen, errnop);
+
+ internal_endspent (&ent);
+
+ return result;
+}
+
+
+/* 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];
+ 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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