diff options
Diffstat (limited to 'nss/nss_db/db-XXX.c')
| -rw-r--r-- | nss/nss_db/db-XXX.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/nss/nss_db/db-XXX.c b/nss/nss_db/db-XXX.c new file mode 100644 index 0000000000..3f6f35d7ec --- /dev/null +++ b/nss/nss_db/db-XXX.c @@ -0,0 +1,203 @@ +/* Common code for DB-based databases in nss_db module. +Copyright (C) 1996 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 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., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <db.h> +#include <fcntl.h> +#include <libc-lock.h> +#include "nsswitch.h" + +/* These symbols are defined by the including source file: + + ENTNAME -- database name of the structure and functions (hostent, pwent). + STRUCTURE -- struct name, define only if not ENTNAME (passwd, group). + DATABASE -- database file name, ("hosts", "passwd") + + NEED_H_ERRNO - defined iff an arg `int *herrnop' is used. +*/ + +#define ENTNAME_r CONCAT(ENTNAME,_r) + +#include <paths.h> +#define DBFILE _PATH_VARDB DATABASE + +#ifdef NEED_H_ERRNO +#define H_ERRNO_PROTO , int *herrnop +#define H_ERRNO_ARG , herrnop +#define H_ERRNO_SET(val) (*herrnop = (val)) +#else +#define H_ERRNO_PROTO +#define H_ERRNO_ARG +#define H_ERRNO_SET(val) ((void) 0) +#endif + +/* Locks the static variables in this file. */ +__libc_lock_define_initialized (static, lock); + +/* Maintenance of the shared handle open on the database. */ + +static DB *db; +static int keep_db; +static unsigned int entidx; /* Index for `getENTNAME'. */ + +/* Open database file if not already opened. */ +static int +internal_setent (int stayopen) +{ + int status = NSS_STATUS_SUCCESS; + + if (db == NULL) + { + db = dbopen (DBFILE, O_RDONLY, 0, DB_BTREE, NULL); + + if (db == NULL) + status = NSS_STATUS_UNAVAIL; + } + + /* Remember STAYOPEN flag. */ + if (db != NULL) + keep_db |= stayopen; + + return status; +} + + +/* Thread-safe, exported version of that. */ +int +CONCAT(_nss_files_set,ENTNAME) (int stayopen) +{ + int status; + + __libc_lock_lock (lock); + + status = internal_setent (stayopen); + + /* Reset the sequential index. */ + entidx = 0; + + __libc_lock_unlock (lock); + + return status; +} + + +/* Close the database file. */ +static void +internal_endent (void) +{ + if (db != NULL) + { + (*db->close) (db); + db = NULL; + } +} + + +/* Thread-safe, exported version of that. */ +int +CONCAT(_nss_files_end,ENTNAME) (void) +{ + __libc_lock_lock (lock); + + internal_endent (); + + /* Reset STAYOPEN flag. */ + keep_db = 0; + + __libc_lock_unlock (lock); + + return NSS_STATUS_SUCCESS; +} + +/* Do a database lookup for KEY. */ +static enum nss_status +lookup (const DBT *key, struct STRUCTURE *result, + void *buffer, int buflen H_ERRNO_PROTO) +{ + enum nss_status status; + DBT value; + + /* Open the database. */ + internal_setent (keep_db); + + /* Succeed iff it matches a value that parses correctly. */ + status = (((*db->get) (db, key, &value, 0) == 0 && + parse_line (value.data, result, buffer, buflen) == 0) + ? NSS_STATUS_SUCCESS : NSS_STATUS_NOTFOUND); + + if (! keep_db) + internal_endent (); + + return status; +} + + +/* Macro for defining lookup functions for this DB-based database. + + NAME is the name of the lookup; e.g. `pwnam'. + + KEYPATTERN gives `printf' args to construct a key string; + e.g. `(".%s", name)'. + + KEYSIZE gives the allocation size of a buffer to construct it in; + e.g. `1 + strlen (name)'. + + PROTO describes the arguments for the lookup key; + e.g. `const char *name'. + + BREAK_IF_MATCH is ignored, but used by ../nss_files/files-XXX.c. */ + +#define DB_LOOKUP(name, keysize, keypattern, break_if_match, proto...) \ +enum nss_status \ +_nss_files_get##name##_r (proto, \ + struct STRUCTURE *result, \ + char *buffer, int buflen H_ERRNO_PROTO) \ +{ \ + DBT key; \ + enum nss_status status; \ + const size_t size = (keysize); \ + key.data = __alloca (size); \ + key.size = KEYPRINTF keypattern; \ + __libc_lock_lock (lock); \ + status = lookup (&key, result, buffer, buflen H_ERRNO_ARG); \ + __libc_lock_unlock (lock); \ + return status; \ +} + +#define KEYPRINTF(pattern, args...) snprintf (key.data, size, pattern ,##args) + + + + +/* Return the next entry from the database file, doing locking. */ +enum nss_status +CONCAT(_nss_files_get,ENTNAME_r) (struct STRUCTURE *result, + char *buffer, int buflen H_ERRNO_PROTO) +{ + /* Return next entry in host file. */ + enum nss_status status; + char buf[20]; + DBT key; + + __libc_lock_lock (lock); + key.size = 1 + snprintf (key.data = buf, sizeof buf, "0%u", entidx++); + status = lookup (&key, result, buffer, buflen H_ERRNO_ARG); + __libc_lock_unlock (lock); + + return status; +} |