#define _NSS_FILES_H
#include <stdio.h>
+#if IS_IN (libc)
+#include <libc-lock.h>
+#endif
/* Open PATH for reading, as a data source for nss_files. */
FILE *__nss_files_fopen (const char *path);
int __nss_parse_line_result (FILE *fp, off64_t offset, int parse_line_result);
libc_hidden_proto (__nss_parse_line_result)
+/* Per-file data. Used by the *ent functions that need to preserve
+ state across calls. */
+struct nss_files_per_file_data
+{
+ FILE *stream;
+#if IS_IN (libc)
+ /* The size of locks changes between libc and nss_files, so this
+ member must be last and is only available in libc. */
+ __libc_lock_define (, lock);
+#endif
+};
+
+/* File index for __nss_files_data_get. */
+enum nss_files_file
+ {
+ nss_file_aliasent,
+ nss_file_etherent,
+ nss_file_grent,
+ nss_file_hostent,
+ nss_file_netent,
+ nss_file_protoent,
+ nss_file_pwent,
+ nss_file_rpcent,
+ nss_file_servent,
+ nss_file_sgent,
+ nss_file_spent,
+
+ nss_file_count
+ };
+
+/* Obtains a pointer to the per-file data for FILE, which is written
+ to *PDATA, and tries to open the file at PATH for it. On success,
+ returns NSS_STATUS_SUCCESS, and the caller must later call
+ __nss_files_data_put. On failure, NSS_STATUS_TRYAGAIN is returned,
+ and *ERRNOP and *HERRNOP are updated if these pointers are not
+ null. */
+enum nss_status __nss_files_data_open (struct nss_files_per_file_data **pdata,
+ enum nss_files_file file,
+ const char *path,
+ int *errnop, int *herrnop);
+libc_hidden_proto (__nss_files_data_open)
+
+/* Unlock the per-file data, previously obtained by
+ __nss_files_data_open. */
+void __nss_files_data_put (struct nss_files_per_file_data *data);
+libc_hidden_proto (__nss_files_data_put)
+
+/* Performs the set*ent operation for FILE. PATH is the file to
+ open. */
+enum nss_status __nss_files_data_setent (enum nss_files_file file,
+ const char *path);
+libc_hidden_proto (__nss_files_data_setent)
+
+/* Performs the end*ent operation for FILE. */
+enum nss_status __nss_files_data_endent (enum nss_files_file file);
+libc_hidden_proto (__nss_files_data_endent)
+
struct parser_data;
/* Instances of the parse_line function from
compat-lookup nss_hash nss_files_fopen \
nss_readline nss_parse_line_result \
nss_fgetent_r nss_module nss_action \
- nss_action_parse nss_database
+ nss_action_parse nss_database nss_files_data
# These are the databases that go through nss dispatch.
# Caution: if you add a database here, you must add its real name
__nss_services_lookup2; __nss_next2; __nss_lookup;
__nss_hash; __nss_database_get;
__nss_files_fopen; __nss_readline; __nss_parse_line_result;
+ __nss_files_data_endent;
+ __nss_files_data_open;
+ __nss_files_data_put;
+ __nss_files_data_setent;
}
}
# include <netdb.h>
# define H_ERRNO_PROTO , int *herrnop
# define H_ERRNO_ARG , herrnop
+# define H_ERRNO_ARG_OR_NULL herrnop
# define H_ERRNO_SET(val) (*herrnop = (val))
#else
# define H_ERRNO_PROTO
# define H_ERRNO_ARG
+# define H_ERRNO_ARG_OR_NULL NULL
# define H_ERRNO_SET(val) ((void) 0)
#endif
# define EXTRA_ARGS_VALUE
#endif
-/* Locks the static variables in this file. */
-__libc_lock_define_initialized (static, lock)
\f
/* Maintenance of the stream open on the database file. For getXXent
operations the stream needs to be held open across calls, the other
getXXbyYY operations all use their own stream. */
-static FILE *stream;
-
/* Open database file if not already opened. */
static enum nss_status
internal_setent (FILE **stream)
enum nss_status
CONCAT(_nss_files_set,ENTNAME) (int stayopen)
{
- enum nss_status status;
-
- __libc_lock_lock (lock);
-
- status = internal_setent (&stream);
-
- __libc_lock_unlock (lock);
-
- return status;
-}
-
-
-/* Close the database file. */
-static void
-internal_endent (FILE **stream)
-{
- if (*stream != NULL)
- {
- fclose (*stream);
- *stream = NULL;
- }
+ return __nss_files_data_setent (CONCAT (nss_file_, ENTNAME), DATAFILE);
}
-
-/* Thread-safe, exported version of that. */
enum nss_status
CONCAT(_nss_files_end,ENTNAME) (void)
{
- __libc_lock_lock (lock);
-
- internal_endent (&stream);
-
- __libc_lock_unlock (lock);
-
- return NSS_STATUS_SUCCESS;
+ return __nss_files_data_endent (CONCAT (nss_file_, ENTNAME));
}
\f
size_t buflen, int *errnop H_ERRNO_PROTO)
{
/* Return next entry in host file. */
- enum nss_status status = NSS_STATUS_SUCCESS;
-
- __libc_lock_lock (lock);
-
- /* Be prepared that the set*ent function was not called before. */
- if (stream == NULL)
- {
- int save_errno = errno;
-
- status = internal_setent (&stream);
-
- __set_errno (save_errno);
- }
- if (status == NSS_STATUS_SUCCESS)
- status = internal_getent (stream, result, buffer, buflen, errnop
- H_ERRNO_ARG EXTRA_ARGS_VALUE);
+ struct nss_files_per_file_data *data;
+ enum nss_status status = __nss_files_data_open (&data,
+ CONCAT (nss_file_, ENTNAME),
+ DATAFILE,
+ errnop, H_ERRNO_ARG_OR_NULL);
+ if (status != NSS_STATUS_SUCCESS)
+ return status;
- __libc_lock_unlock (lock);
+ status = internal_getent (data->stream, result, buffer, buflen, errnop
+ H_ERRNO_ARG EXTRA_ARGS_VALUE);
+ __nss_files_data_put (data);
return status;
}
\f
== NSS_STATUS_SUCCESS) \
{ break_if_match } \
\
- internal_endent (&stream); \
+ fclose (stream); \
} \
\
return status; \
NSS_DECLARE_MODULE_FUNCTIONS (files)
-/* Locks the static variables in this file. */
-__libc_lock_define_initialized (static, lock)
\f
/* Maintenance of the stream open on the database file. For getXXent
operations the stream needs to be held open across calls, the other
getXXbyYY operations all use their own stream. */
-static FILE *stream;
-
-
static enum nss_status
internal_setent (FILE **stream)
{
enum nss_status
_nss_files_setaliasent (void)
{
- enum nss_status status;
-
- __libc_lock_lock (lock);
-
- status = internal_setent (&stream);
-
- __libc_lock_unlock (lock);
-
- return status;
-}
-
-
-/* Close the database file. */
-static void
-internal_endent (FILE **stream)
-{
- if (*stream != NULL)
- {
- fclose (*stream);
- *stream = NULL;
- }
+ return __nss_files_data_setent (nss_file_aliasent, "/etc/aliases");
}
-
-/* Thread-safe, exported version of that. */
enum nss_status
_nss_files_endaliasent (void)
{
- __libc_lock_lock (lock);
-
- internal_endent (&stream);
-
- __libc_lock_unlock (lock);
-
- return NSS_STATUS_SUCCESS;
+ return __nss_files_data_endent (nss_file_aliasent);
}
\f
/* Parsing the database file into `struct aliasent' data structures. */
int *errnop)
{
/* Return next entry in host file. */
- enum nss_status status = NSS_STATUS_SUCCESS;
- __libc_lock_lock (lock);
+ struct nss_files_per_file_data *data;
+ enum nss_status status = __nss_files_data_open (&data, nss_file_aliasent,
+ "/etc/aliases", errnop, NULL);
+ if (status != NSS_STATUS_SUCCESS)
+ return status;
- /* Be prepared that the set*ent function was not called before. */
- if (stream == NULL)
- status = internal_setent (&stream);
+ result->alias_local = 1;
- if (status == NSS_STATUS_SUCCESS)
- {
- result->alias_local = 1;
-
- /* Read lines until we get a definite result. */
- do
- status = get_next_alias (stream, NULL, result, buffer, buflen, errnop);
- while (status == NSS_STATUS_RETURN);
- }
-
- __libc_lock_unlock (lock);
+ /* Read lines until we get a definite result. */
+ do
+ status = get_next_alias (data->stream, NULL, result, buffer, buflen,
+ errnop);
+ while (status == NSS_STATUS_RETURN);
+ __nss_files_data_put (data);
return status;
}
do
status = get_next_alias (stream, name, result, buffer, buflen, errnop);
while (status == NSS_STATUS_RETURN);
- }
- internal_endent (&stream);
+ fclose (stream);
+ }
return status;
}
status = gethostbyname3_multi
(stream, name, af, result, buffer, buflen, errnop, herrnop);
- internal_endent (&stream);
+ fclose (stream);
}
if (canonp && status == NSS_STATUS_SUCCESS)
status = NSS_STATUS_SUCCESS;
}
- internal_endent (&stream);
+ fclose (stream);
}
else if (status == NSS_STATUS_TRYAGAIN)
{
--- /dev/null
+/* Returns a pointer to the global nss_files data structure.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ 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
+ <https://www.gnu.org/licenses/>. */
+
+#include <nss_files.h>
+
+#include <allocate_once.h>
+#include <errno.h>
+#include <netdb.h>
+#include <nss.h>
+#include <stdlib.h>
+
+/* This collects all per file-data. */
+struct nss_files_data
+{
+ struct nss_files_per_file_data files[nss_file_count];
+};
+
+/* For use with allocate_once. */
+static void *nss_files_global;
+static void *
+nss_files_global_allocate (void *closure)
+{
+ struct nss_files_data *result = malloc (sizeof (*result));
+ if (result != NULL)
+ {
+ for (int i = 0; i < nss_file_count; ++i)
+ {
+ result->files[i].stream = NULL;
+ __libc_lock_init (result->files[i].lock);
+ }
+ }
+ return result;
+}
+/* Like __nss_files_data_open, but does not perform the open call. */
+static enum nss_status
+__nss_files_data_get (struct nss_files_per_file_data **pdata,
+ enum nss_files_file file, int *errnop, int *herrnop)
+{
+ struct nss_files_data *data = allocate_once (&nss_files_global,
+ nss_files_global_allocate,
+ NULL, NULL);
+ if (data == NULL)
+ {
+ if (errnop != NULL)
+ *errnop = errno;
+ if (herrnop != NULL)
+ {
+ __set_h_errno (NETDB_INTERNAL);
+ *herrnop = NETDB_INTERNAL;
+ }
+ return NSS_STATUS_TRYAGAIN;
+ }
+
+ *pdata = &data->files[file];
+ __libc_lock_lock ((*pdata)->lock);
+ return NSS_STATUS_SUCCESS;
+}
+
+/* Helper function for opening the backing file at PATH. */
+static enum nss_status
+__nss_files_data_internal_open (struct nss_files_per_file_data *data,
+ const char *path)
+{
+ enum nss_status status = NSS_STATUS_SUCCESS;
+
+ if (data->stream == NULL)
+ {
+ data->stream = __nss_files_fopen (path);
+
+ if (data->stream == NULL)
+ status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
+ }
+
+ return status;
+}
+
+
+enum nss_status
+__nss_files_data_open (struct nss_files_per_file_data **pdata,
+ enum nss_files_file file, const char *path,
+ int *errnop, int *herrnop)
+{
+ enum nss_status status = __nss_files_data_get (pdata, file, errnop, herrnop);
+ if (status != NSS_STATUS_SUCCESS)
+ return status;
+
+ /* Be prepared that the set*ent function was not called before. */
+ if ((*pdata)->stream == NULL)
+ {
+ int saved_errno = errno;
+ status = __nss_files_data_internal_open (*pdata, path);
+ __set_errno (saved_errno);
+ if (status != NSS_STATUS_SUCCESS)
+ __nss_files_data_put (*pdata);
+ }
+
+ return status;
+}
+
+libc_hidden_def (__nss_files_data_open)
+
+void
+__nss_files_data_put (struct nss_files_per_file_data *data)
+{
+ __libc_lock_unlock (data->lock);
+}
+libc_hidden_def (__nss_files_data_put)
+
+enum nss_status
+__nss_files_data_setent (enum nss_files_file file, const char *path)
+{
+ struct nss_files_per_file_data *data;
+ enum nss_status status = __nss_files_data_get (&data, file, NULL, NULL);
+ if (status != NSS_STATUS_SUCCESS)
+ return status;
+
+ if (data->stream == NULL)
+ status = __nss_files_data_internal_open (data, path);
+ else
+ rewind (data->stream);
+
+ __nss_files_data_put (data);
+ return status;
+}
+libc_hidden_def (__nss_files_data_setent)
+
+enum nss_status
+__nss_files_data_endent (enum nss_files_file file)
+{
+ /* No cleanup is necessary if not initialized. */
+ struct nss_files_data *data = atomic_load_acquire (&nss_files_global);
+ if (data == NULL)
+ return NSS_STATUS_SUCCESS;
+
+ struct nss_files_per_file_data *fdata = &data->files[file];
+ __libc_lock_lock (fdata->lock);
+ if (fdata->stream != NULL)
+ {
+ fclose (fdata->stream);
+ fdata->stream = NULL;
+ }
+ __libc_lock_unlock (fdata->lock);
+
+ return NSS_STATUS_SUCCESS;
+}
+libc_hidden_def (__nss_files_data_endent)
projects / thirdparty / glibc.git / commitdiff
