smdb2.c
上传用户:xu_441
上传日期:2007-01-04
资源大小:1640k
文件大小:13k
- /*
- ** Copyright (c) 1999 Sendmail, Inc. and its suppliers.
- ** All rights reserved.
- **
- ** By using this file, you agree to the terms and conditions set
- ** forth in the LICENSE file which can be found at the top level of
- ** the sendmail distribution.
- */
- #ifndef lint
- static char id[] = "@(#)$Id: smdb2.c,v 8.48 1999/11/23 08:42:54 gshapiro Exp $";
- #endif /* ! lint */
- #include <fcntl.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <sendmail/sendmail.h>
- #include <libsmdb/smdb.h>
- #if (DB_VERSION_MAJOR >= 2)
- # define SMDB2_FILE_EXTENSION "db"
- struct smdb_db2_database
- {
- DB *smdb2_db;
- int smdb2_lock_fd;
- };
- typedef struct smdb_db2_database SMDB_DB2_DATABASE;
- /*
- ** SMDB_TYPE_TO_DB2_TYPE -- Translates smdb database type to db2 type.
- **
- ** Parameters:
- ** type -- The type to translate.
- **
- ** Returns:
- ** The DB2 type that corresponsds to the passed in SMDB type.
- ** Returns -1 if there is no equivalent type.
- **
- */
- DBTYPE
- smdb_type_to_db2_type(type)
- SMDB_DBTYPE type;
- {
- if (type == SMDB_TYPE_DEFAULT)
- return DB_HASH;
- if (strncmp(type, SMDB_TYPE_HASH, SMDB_TYPE_HASH_LEN) == 0)
- return DB_HASH;
- if (strncmp(type, SMDB_TYPE_BTREE, SMDB_TYPE_BTREE_LEN) == 0)
- return DB_BTREE;
- return DB_UNKNOWN;
- }
- /*
- ** DB2_ERROR_TO_SMDB -- Translates db2 errors to smdbe errors
- **
- ** Parameters:
- ** error -- The error to translate.
- **
- ** Returns:
- ** The SMDBE error corresponding to the db2 error.
- ** If we don't have a corresponding error, it returs errno.
- **
- */
- int
- db2_error_to_smdb(error)
- int error;
- {
- int result;
- switch (error)
- {
- # ifdef DB_INCOMPLETE
- case DB_INCOMPLETE:
- result = SMDBE_INCOMPLETE;
- break;
- # endif /* DB_INCOMPLETE */
- # ifdef DB_NOTFOUND
- case DB_NOTFOUND:
- result = SMDBE_NOT_FOUND;
- break;
- # endif /* DB_NOTFOUND */
- # ifdef DB_KEYEMPTY
- case DB_KEYEMPTY:
- result = SMDBE_KEY_EMPTY;
- break;
- # endif /* DB_KEYEMPTY */
- # ifdef DB_KEYEXIST
- case DB_KEYEXIST:
- result = SMDBE_KEY_EXIST;
- break;
- # endif /* DB_KEYEXIST */
- # ifdef DB_LOCK_DEADLOCK
- case DB_LOCK_DEADLOCK:
- result = SMDBE_LOCK_DEADLOCK;
- break;
- # endif /* DB_LOCK_DEADLOCK */
- # ifdef DB_LOCK_NOTGRANTED
- case DB_LOCK_NOTGRANTED:
- result = SMDBE_LOCK_NOT_GRANTED;
- break;
- # endif /* DB_LOCK_NOTGRANTED */
- # ifdef DB_LOCK_NOTHELD
- case DB_LOCK_NOTHELD:
- result = SMDBE_LOCK_NOT_HELD;
- break;
- # endif /* DB_LOCK_NOTHELD */
- # ifdef DB_RUNRECOVERY
- case DB_RUNRECOVERY:
- result = SMDBE_RUN_RECOVERY;
- break;
- # endif /* DB_RUNRECOVERY */
- # ifdef DB_OLD_VERSION
- case DB_OLD_VERSION:
- result = SMDBE_OLD_VERSION;
- break;
- # endif /* DB_OLD_VERSION */
- case 0:
- result = SMDBE_OK;
- break;
- default:
- result = errno;
- }
- return result;
- }
- /*
- ** SMDB_PUT_FLAGS_TO_DB2_FLAGS -- Translates smdb put flags to db2 put flags.
- **
- ** Parameters:
- ** flags -- The flags to translate.
- **
- ** Returns:
- ** The db2 flags that are equivalent to the smdb flags.
- **
- ** Notes:
- ** Any invalid flags are ignored.
- **
- */
- u_int
- smdb_put_flags_to_db2_flags(flags)
- SMDB_FLAG flags;
- {
- int return_flags;
- return_flags = 0;
- if (bitset(SMDBF_NO_OVERWRITE, flags))
- return_flags |= DB_NOOVERWRITE;
- return return_flags;
- }
- /*
- ** SMDB_CURSOR_GET_FLAGS_TO_DB2 -- Translates smdb cursor get flags to db2
- ** getflags.
- **
- ** Parameters:
- ** flags -- The flags to translate.
- **
- ** Returns:
- ** The db2 flags that are equivalent to the smdb flags.
- **
- ** Notes:
- ** -1 is returned if flag is unknown.
- **
- */
- int
- smdb_cursor_get_flags_to_db2(flags)
- SMDB_FLAG flags;
- {
- switch (flags)
- {
- case SMDB_CURSOR_GET_FIRST:
- return DB_FIRST;
- case SMDB_CURSOR_GET_LAST:
- return DB_LAST;
- case SMDB_CURSOR_GET_NEXT:
- return DB_NEXT;
- default:
- return -1;
- }
- }
- SMDB_DB2_DATABASE *
- smdb2_malloc_database()
- {
- SMDB_DB2_DATABASE *db2;
- db2 = (SMDB_DB2_DATABASE *) malloc(sizeof(SMDB_DB2_DATABASE));
- if (db2 != NULL)
- db2->smdb2_lock_fd = -1;
- return db2;
- }
- /*
- ** Except for smdb_db_open, the rest of these function correspond to the
- ** interface laid out in smdb.h.
- */
- int
- smdb2_close(database)
- SMDB_DATABASE *database;
- {
- SMDB_DB2_DATABASE *db2 = (SMDB_DB2_DATABASE *) database->smdb_impl;
- DB *db = ((SMDB_DB2_DATABASE *) database->smdb_impl)->smdb2_db;
- if (db2->smdb2_lock_fd != -1)
- close(db2->smdb2_lock_fd);
- free(db2);
- database->smdb_impl = NULL;
- return db2_error_to_smdb(db->close(db, 0));
- }
- int
- smdb2_del(database, key, flags)
- SMDB_DATABASE *database;
- SMDB_DBENT *key;
- u_int flags;
- {
- DB *db = ((SMDB_DB2_DATABASE *) database->smdb_impl)->smdb2_db;
- return db2_error_to_smdb(db->del(db, NULL, &key->db, flags));
- }
- int
- smdb2_fd(database, fd)
- SMDB_DATABASE *database;
- int *fd;
- {
- DB *db = ((SMDB_DB2_DATABASE *) database->smdb_impl)->smdb2_db;
- return db2_error_to_smdb(db->fd(db, fd));
- }
- int
- smdb2_get(database, key, data, flags)
- SMDB_DATABASE *database;
- SMDB_DBENT *key;
- SMDB_DBENT *data;
- u_int flags;
- {
- DB *db = ((SMDB_DB2_DATABASE *) database->smdb_impl)->smdb2_db;
- return db2_error_to_smdb(db->get(db, NULL, &key->db, &data->db, flags));
- }
- int
- smdb2_put(database, key, data, flags)
- SMDB_DATABASE *database;
- SMDB_DBENT *key;
- SMDB_DBENT *data;
- u_int flags;
- {
- DB *db = ((SMDB_DB2_DATABASE *) database->smdb_impl)->smdb2_db;
- return db2_error_to_smdb(db->put(db, NULL, &key->db, &data->db,
- smdb_put_flags_to_db2_flags(flags)));
- }
- int
- smdb2_set_owner(database, uid, gid)
- SMDB_DATABASE *database;
- uid_t uid;
- gid_t gid;
- {
- # if HASFCHOWN
- int fd;
- int result;
- DB *db = ((SMDB_DB2_DATABASE *) database->smdb_impl)->smdb2_db;
- result = db->fd(db, &fd);
- if (result != 0)
- return result;
- result = fchown(fd, uid, gid);
- if (result < 0)
- return errno;
- # endif /* HASFCHOWN */
- return SMDBE_OK;
- }
- int
- smdb2_sync(database, flags)
- SMDB_DATABASE *database;
- u_int flags;
- {
- DB *db = ((SMDB_DB2_DATABASE *) database->smdb_impl)->smdb2_db;
- return db2_error_to_smdb(db->sync(db, flags));
- }
- int
- smdb2_cursor_close(cursor)
- SMDB_CURSOR *cursor;
- {
- DBC *dbc = (DBC *) cursor->smdbc_impl;
- return db2_error_to_smdb(dbc->c_close(dbc));
- }
- int
- smdb2_cursor_del(cursor, flags)
- SMDB_CURSOR *cursor;
- SMDB_FLAG flags;
- {
- DBC *dbc = (DBC *) cursor->smdbc_impl;
- return db2_error_to_smdb(dbc->c_del(dbc, 0));
- }
- int
- smdb2_cursor_get(cursor, key, value, flags)
- SMDB_CURSOR *cursor;
- SMDB_DBENT *key;
- SMDB_DBENT *value;
- SMDB_FLAG flags;
- {
- int db2_flags;
- int result;
- DBC *dbc = (DBC *) cursor->smdbc_impl;
- db2_flags = smdb_cursor_get_flags_to_db2(flags);
- result = dbc->c_get(dbc, &key->db, &value->db, db2_flags);
- if (result == DB_NOTFOUND)
- return SMDBE_LAST_ENTRY;
- return db2_error_to_smdb(result);
- }
- int
- smdb2_cursor_put(cursor, key, value, flags)
- SMDB_CURSOR *cursor;
- SMDB_DBENT *key;
- SMDB_DBENT *value;
- SMDB_FLAG flags;
- {
- DBC *dbc = (DBC *) cursor->smdbc_impl;
- return db2_error_to_smdb(dbc->c_put(dbc, &key->db, &value->db, 0));
- }
- int
- smdb2_cursor(database, cursor, flags)
- SMDB_DATABASE *database;
- SMDB_CURSOR **cursor;
- SMDB_FLAG flags;
- {
- int result;
- DB *db = ((SMDB_DB2_DATABASE *) database->smdb_impl)->smdb2_db;
- DBC *db2_cursor;
- # if DB_VERSION_MAJOR > 2 || DB_VERSION_MINOR >= 6
- result = db->cursor(db, NULL, &db2_cursor, 0);
- # else /* DB_VERSION_MAJOR > 2 || DB_VERSION_MINOR >= 6 */
- result = db->cursor(db, NULL, &db2_cursor);
- # endif /* DB_VERSION_MAJOR > 2 || DB_VERSION_MINOR >= 6 */
- if (result != 0)
- return db2_error_to_smdb(result);
- *cursor = (SMDB_CURSOR *) malloc(sizeof(SMDB_CURSOR));
- if (*cursor == NULL)
- return SMDBE_MALLOC;
- (*cursor)->smdbc_close = smdb2_cursor_close;
- (*cursor)->smdbc_del = smdb2_cursor_del;
- (*cursor)->smdbc_get = smdb2_cursor_get;
- (*cursor)->smdbc_put = smdb2_cursor_put;
- (*cursor)->smdbc_impl = db2_cursor;
- return SMDBE_OK;
- }
- # if DB_VERSION_MAJOR == 2
- static int
- smdb_db_open_internal(db_name, db_type, db_flags, db_params, db)
- char *db_name;
- DBTYPE db_type;
- int db_flags;
- SMDB_DBPARAMS *db_params;
- DB **db;
- {
- void *params;
- DB_INFO db_info;
- params = NULL;
- memset(&db_info, ' ', sizeof db_info);
- if (db_params != NULL)
- {
- db_info.db_cachesize = db_params->smdbp_cache_size;
- if (db_type == DB_HASH)
- db_info.h_nelem = db_params->smdbp_num_elements;
- if (db_params->smdbp_allow_dup)
- db_info.flags |= DB_DUP;
- params = &db_info;
- }
- return db_open(db_name, db_type, db_flags, 0644, NULL, params, db);
- }
- # endif /* DB_VERSION_MAJOR == 2 */
- # if DB_VERSION_MAJOR > 2
- static int
- smdb_db_open_internal(db_name, db_type, db_flags, db_params, db)
- char *db_name;
- DBTYPE db_type;
- int db_flags;
- SMDB_DBPARAMS *db_params;
- DB **db;
- {
- int result;
- result = db_create(db, NULL, 0);
- if (result != 0 || *db == NULL)
- return result;
- if (db_params != NULL)
- {
- result = (*db)->set_cachesize(*db, 0,
- db_params->smdbp_cache_size, 0);
- if (result != 0)
- {
- (void) (*db)->close((*db), 0);
- *db = NULL;
- return db2_error_to_smdb(result);
- }
- if (db_type == DB_HASH)
- {
- result = (*db)->set_h_nelem(*db, db_params->smdbp_num_elements);
- if (result != 0)
- {
- (void) (*db)->close(*db, 0);
- *db = NULL;
- return db2_error_to_smdb(result);
- }
- }
- if (db_params->smdbp_allow_dup)
- {
- result = (*db)->set_flags(*db, DB_DUP);
- if (result != 0)
- {
- (void) (*db)->close(*db, 0);
- *db = NULL;
- return db2_error_to_smdb(result);
- }
- }
- }
- result = (*db)->open(*db, db_name, NULL, db_type, db_flags, 0644);
- if (result != 0)
- {
- (void) (*db)->close(*db, 0);
- *db = NULL;
- }
- return db2_error_to_smdb(result);
- }
- # endif /* DB_VERSION_MAJOR > 2 */
- /*
- ** SMDB_DB_OPEN -- Opens a db database.
- **
- ** Parameters:
- ** database -- An unallocated database pointer to a pointer.
- ** db_name -- The name of the database without extension.
- ** mode -- File permisions for a created database.
- ** mode_mask -- Mode bits that must match on an opened database.
- ** sff -- Flags for safefile.
- ** type -- The type of database to open
- ** See smdb_type_to_db2_type for valid types.
- ** user_info -- User information for file permissions.
- ** db_params --
- ** An SMDB_DBPARAMS struct including params. These
- ** are processed according to the type of the
- ** database. Currently supported params (only for
- ** HASH type) are:
- ** num_elements
- ** cache_size
- **
- ** Returns:
- ** SMDBE_OK -- Success, other errno:
- ** SMDBE_MALLOC -- Cannot allocate memory.
- ** SMDBE_BAD_OPEN -- db_open didn't return an error, but
- ** somehow the DB pointer is NULL.
- ** Anything else: translated error from db2
- */
- int
- smdb_db_open(database, db_name, mode, mode_mask, sff, type, user_info, db_params)
- SMDB_DATABASE **database;
- char *db_name;
- int mode;
- int mode_mask;
- int sff;
- SMDB_DBTYPE type;
- SMDB_USER_INFO *user_info;
- SMDB_DBPARAMS *db_params;
- {
- int result;
- int db_flags;
- int lock_fd;
- int db_fd;
- SMDB_DATABASE *smdb_db;
- SMDB_DB2_DATABASE *db2;
- DB *db;
- DBTYPE db_type;
- struct stat stat_info;
- char db_file_name[SMDB_MAX_NAME_LEN];
- *database = NULL;
- result = smdb_add_extension(db_file_name, SMDB_MAX_NAME_LEN,
- db_name, SMDB2_FILE_EXTENSION);
- if (result != SMDBE_OK)
- return result;
- result = smdb_setup_file(db_name, SMDB2_FILE_EXTENSION,
- mode_mask, sff, user_info, &stat_info);
- if (result != SMDBE_OK)
- return result;
- lock_fd = -1;
- result = smdb_lock_file(&lock_fd, db_name, mode, sff,
- SMDB2_FILE_EXTENSION);
- if (result != SMDBE_OK)
- return result;
- smdb_db = smdb_malloc_database();
- if (smdb_db == NULL)
- return SMDBE_MALLOC;
- db2 = smdb2_malloc_database();
- if (db2 == NULL)
- return SMDBE_MALLOC;
- db2->smdb2_lock_fd = lock_fd;
- db_type = smdb_type_to_db2_type(type);
- db = NULL;
- db_flags = 0;
- if (O_CREAT & mode)
- db_flags |= DB_CREATE;
- if (O_TRUNC & mode)
- db_flags |= DB_TRUNCATE;
- if (O_RDONLY == mode)
- db_flags |= DB_RDONLY;
- # if !HASFLOCK && defined(DB_FCNTL_LOCKING)
- db_flags |= DB_FCNTL_LOCKING;
- # endif /* !HASFLOCK && defined(DB_FCNTL_LOCKING) */
- result = smdb_db_open_internal(db_file_name, db_type,
- db_flags, db_params, &db);
- if (result == 0 && db != NULL)
- {
- result = db->fd(db, &db_fd);
- if (result == 0)
- result = SMDBE_OK;
- }
- else
- {
- /* Try and narrow down on the problem */
- if (result != 0)
- result = db2_error_to_smdb(result);
- else
- result = SMDBE_BAD_OPEN;
- }
- if (result == SMDBE_OK)
- result = smdb_filechanged(db_name, SMDB2_FILE_EXTENSION, db_fd,
- &stat_info);
- if (result == SMDBE_OK)
- {
- /* Everything is ok. Setup driver */
- db2->smdb2_db = db;
- smdb_db->smdb_close = smdb2_close;
- smdb_db->smdb_del = smdb2_del;
- smdb_db->smdb_fd = smdb2_fd;
- smdb_db->smdb_get = smdb2_get;
- smdb_db->smdb_put = smdb2_put;
- smdb_db->smdb_set_owner = smdb2_set_owner;
- smdb_db->smdb_sync = smdb2_sync;
- smdb_db->smdb_cursor = smdb2_cursor;
- smdb_db->smdb_impl = db2;
- *database = smdb_db;
- return SMDBE_OK;
- }
- if (db != NULL)
- db->close(db, 0);
- smdb_unlock_file(db2->smdb2_lock_fd);
- free(db2);
- smdb_free_database(smdb_db);
- return result;
- }
- #endif /* (DB_VERSION_MAJOR >= 2) */