sendmail/libsmdb/smdb1.c

/*
** Copyright (c) 1999-2002, 2004, 2009 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.
*/

#include <sm/gen.h>
SM_RCSID("@(#)$Id: smdb1.c,v 8.62 2009/11/12 23:04:18 ca Exp $")

#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>

#include <sendmail/sendmail.h>
#include <libsmdb/smdb.h>

#if (DB_VERSION_MAJOR == 1)

# define SMDB1_FILE_EXTENSION "db"

struct smdb_db1_struct
{
    DB  *smdb1_db;
    int smdb1_lock_fd;
    bool    smdb1_cursor_in_use;
};
typedef struct smdb_db1_struct SMDB_DB1_DATABASE;

struct smdb_db1_cursor
{
    SMDB_DB1_DATABASE   *db;
};
typedef struct smdb_db1_cursor SMDB_DB1_CURSOR;

static DBTYPE       smdb_type_to_db1_type __P((SMDB_DBTYPE));
static unsigned int smdb_put_flags_to_db1_flags __P((SMDB_FLAG));
static int      smdb_cursor_get_flags_to_smdb1 __P((SMDB_FLAG));
static SMDB_DB1_DATABASE *smdb1_malloc_database __P((void));
static int      smdb1_close __P((SMDB_DATABASE *));
static int      smdb1_del __P((SMDB_DATABASE *, SMDB_DBENT *, unsigned int));
static int      smdb1_fd __P((SMDB_DATABASE *, int *));
static int      smdb1_lockfd __P((SMDB_DATABASE *));
static int      smdb1_get __P((SMDB_DATABASE *, SMDB_DBENT *, SMDB_DBENT *, unsigned int));
static int      smdb1_put __P((SMDB_DATABASE *, SMDB_DBENT *, SMDB_DBENT *, unsigned int));
static int      smdb1_set_owner __P((SMDB_DATABASE *, uid_t, gid_t));
static int      smdb1_sync __P((SMDB_DATABASE *, unsigned int));
static int      smdb1_cursor_close __P((SMDB_CURSOR *));
static int      smdb1_cursor_del __P((SMDB_CURSOR *, unsigned int));
static int      smdb1_cursor_get __P((SMDB_CURSOR *, SMDB_DBENT *, SMDB_DBENT *, SMDB_FLAG));
static int      smdb1_cursor_put __P((SMDB_CURSOR *, SMDB_DBENT *, SMDB_DBENT *, SMDB_FLAG));
static int      smdb1_cursor __P((SMDB_DATABASE *, SMDB_CURSOR **, unsigned int));

/*
**  SMDB_TYPE_TO_DB1_TYPE -- Translates smdb database type to db1 type.
**
**  Parameters:
**      type -- The type to translate.
**
**  Returns:
**      The DB1 type that corresponsds to the passed in SMDB type.
**      Returns -1 if there is no equivalent type.
**
*/

static DBTYPE
smdb_type_to_db1_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;

    /* Should never get here thanks to test in smdb_db_open() */
    return DB_HASH;
}
/*
**  SMDB_PUT_FLAGS_TO_DB1_FLAGS -- Translates smdb put flags to db1 put flags.
**
**  Parameters:
**      flags -- The flags to translate.
**
**  Returns:
**      The db1 flags that are equivalent to the smdb flags.
**
**  Notes:
**      Any invalid flags are ignored.
**
*/

static unsigned int
smdb_put_flags_to_db1_flags(flags)
    SMDB_FLAG flags;
{
    int return_flags;

    return_flags = 0;

    if (bitset(SMDBF_NO_OVERWRITE, flags))
        return_flags |= R_NOOVERWRITE;

    return return_flags;
}
/*
**  SMDB_CURSOR_GET_FLAGS_TO_SMDB1
**
**  Parameters:
**      flags -- The flags to translate.
**
**  Returns:
**      The db1 flags that are equivalent to the smdb flags.
**
**  Notes:
**      Returns -1 if we don't support the flag.
**
*/

static int
smdb_cursor_get_flags_to_smdb1(flags)
    SMDB_FLAG flags;
{
    switch(flags)
    {
        case SMDB_CURSOR_GET_FIRST:
            return R_FIRST;

        case SMDB_CURSOR_GET_LAST:
            return R_LAST;

        case SMDB_CURSOR_GET_NEXT:
            return R_NEXT;

        case SMDB_CURSOR_GET_RANGE:
            return R_CURSOR;

        default:
            return -1;
    }
}

/*
**  The rest of these functions correspond to the interface laid out in smdb.h.
*/

static SMDB_DB1_DATABASE *
smdb1_malloc_database()
{
    SMDB_DB1_DATABASE *db1;

    db1 = (SMDB_DB1_DATABASE *) malloc(sizeof(SMDB_DB1_DATABASE));

    if (db1 != NULL)
    {
        db1->smdb1_lock_fd = -1;
        db1->smdb1_cursor_in_use = false;
    }

    return db1;
}

static int
smdb1_close(database)
    SMDB_DATABASE *database;
{
    int result;
    SMDB_DB1_DATABASE *db1 = (SMDB_DB1_DATABASE *) database->smdb_impl;
    DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;

    result = db->close(db);
    if (db1->smdb1_lock_fd != -1)
        (void) close(db1->smdb1_lock_fd);

    free(db1);
    database->smdb_impl = NULL;

    return result;
}

static int
smdb1_del(database, key, flags)
    SMDB_DATABASE *database;
    SMDB_DBENT *key;
    unsigned int flags;
{
    DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;
    DBT dbkey;

    (void) memset(&dbkey, '\0', sizeof dbkey);
    dbkey.data = key->data;
    dbkey.size = key->size;
    return db->del(db, &dbkey, flags);
}

static int
smdb1_fd(database, fd)
    SMDB_DATABASE *database;
    int *fd;
{
    DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;

    *fd = db->fd(db);
    if (*fd == -1)
        return errno;

    return SMDBE_OK;
}

static int
smdb1_lockfd(database)
    SMDB_DATABASE *database;
{
    SMDB_DB1_DATABASE *db1 = (SMDB_DB1_DATABASE *) database->smdb_impl;

    return db1->smdb1_lock_fd;
}


static int
smdb1_get(database, key, data, flags)
    SMDB_DATABASE *database;
    SMDB_DBENT *key;
    SMDB_DBENT *data;
    unsigned int flags;
{
    int result;
    DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;
    DBT dbkey, dbdata;

    (void) memset(&dbdata, '\0', sizeof dbdata);
    (void) memset(&dbkey, '\0', sizeof dbkey);
    dbkey.data = key->data;
    dbkey.size = key->size;

    result = db->get(db, &dbkey, &dbdata, flags);
    if (result != 0)
    {
        if (result == 1)
            return SMDBE_NOT_FOUND;
        return errno;
    }
    data->data = dbdata.data;
    data->size = dbdata.size;
    return SMDBE_OK;
}

static int
smdb1_put(database, key, data, flags)
    SMDB_DATABASE *database;
    SMDB_DBENT *key;
    SMDB_DBENT *data;
    unsigned int flags;
{
    DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;
    DBT dbkey, dbdata;

    (void) memset(&dbdata, '\0', sizeof dbdata);
    (void) memset(&dbkey, '\0', sizeof dbkey);
    dbkey.data = key->data;
    dbkey.size = key->size;
    dbdata.data = data->data;
    dbdata.size = data->size;

    return db->put(db, &dbkey, &dbdata,
               smdb_put_flags_to_db1_flags(flags));
}

static int
smdb1_set_owner(database, uid, gid)
    SMDB_DATABASE *database;
    uid_t uid;
    gid_t gid;
{
# if HASFCHOWN
    int fd;
    int result;
    DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;

    fd = db->fd(db);
    if (fd == -1)
        return errno;

    result = fchown(fd, uid, gid);
    if (result < 0)
        return errno;
# endif /* HASFCHOWN */

    return SMDBE_OK;
}

static int
smdb1_sync(database, flags)
    SMDB_DATABASE *database;
    unsigned int flags;
{
    DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;

    return db->sync(db, flags);
}

static int
smdb1_cursor_close(cursor)
    SMDB_CURSOR *cursor;
{
    SMDB_DB1_CURSOR *db1_cursor = (SMDB_DB1_CURSOR *) cursor->smdbc_impl;
    SMDB_DB1_DATABASE *db1 = db1_cursor->db;

    if (!db1->smdb1_cursor_in_use)
        return SMDBE_NOT_A_VALID_CURSOR;

    db1->smdb1_cursor_in_use = false;
    free(cursor);

    return SMDBE_OK;
}

static int
smdb1_cursor_del(cursor, flags)
    SMDB_CURSOR *cursor;
    unsigned int flags;
{
    SMDB_DB1_CURSOR *db1_cursor = (SMDB_DB1_CURSOR *) cursor->smdbc_impl;
    SMDB_DB1_DATABASE *db1 = db1_cursor->db;
    DB *db = db1->smdb1_db;

    return db->del(db, NULL, R_CURSOR);
}

static int
smdb1_cursor_get(cursor, key, value, flags)
    SMDB_CURSOR *cursor;
    SMDB_DBENT *key;
    SMDB_DBENT *value;
    SMDB_FLAG flags;
{
    int db1_flags;
    int result;
    SMDB_DB1_CURSOR *db1_cursor = (SMDB_DB1_CURSOR *) cursor->smdbc_impl;
    SMDB_DB1_DATABASE *db1 = db1_cursor->db;
    DB *db = db1->smdb1_db;
    DBT dbkey, dbdata;

    (void) memset(&dbdata, '\0', sizeof dbdata);
    (void) memset(&dbkey, '\0', sizeof dbkey);

    db1_flags = smdb_cursor_get_flags_to_smdb1(flags);
    result = db->seq(db, &dbkey, &dbdata, db1_flags);
    if (result == -1)
        return errno;
    if (result == 1)
        return SMDBE_LAST_ENTRY;
    value->data = dbdata.data;
    value->size = dbdata.size;
    key->data = dbkey.data;
    key->size = dbkey.size;
    return SMDBE_OK;
}

static int
smdb1_cursor_put(cursor, key, value, flags)
    SMDB_CURSOR *cursor;
    SMDB_DBENT *key;
    SMDB_DBENT *value;
    SMDB_FLAG flags;
{
    SMDB_DB1_CURSOR *db1_cursor = (SMDB_DB1_CURSOR *) cursor->smdbc_impl;
    SMDB_DB1_DATABASE *db1 = db1_cursor->db;
    DB *db = db1->smdb1_db;
    DBT dbkey, dbdata;

    (void) memset(&dbdata, '\0', sizeof dbdata);
    (void) memset(&dbkey, '\0', sizeof dbkey);
    dbkey.data = key->data;
    dbkey.size = key->size;
    dbdata.data = value->data;
    dbdata.size = value->size;

    return db->put(db, &dbkey, &dbdata, R_CURSOR);
}

static int
smdb1_cursor(database, cursor, flags)
    SMDB_DATABASE *database;
    SMDB_CURSOR **cursor;
    unsigned int flags;
{
    SMDB_DB1_DATABASE *db1 = (SMDB_DB1_DATABASE *) database->smdb_impl;
    SMDB_CURSOR *cur;
    SMDB_DB1_CURSOR *db1_cursor;

    if (db1->smdb1_cursor_in_use)
        return SMDBE_ONLY_SUPPORTS_ONE_CURSOR;

    db1_cursor = (SMDB_DB1_CURSOR *) malloc(sizeof(SMDB_DB1_CURSOR));
    if (db1_cursor == NULL)
        return SMDBE_MALLOC;

    cur = (SMDB_CURSOR *) malloc(sizeof(SMDB_CURSOR));
    if (cur == NULL)
    {
        free(db1_cursor);
        return SMDBE_MALLOC;
    }

    db1->smdb1_cursor_in_use = true;
    db1_cursor->db = db1;
    cur->smdbc_impl = db1_cursor;
    cur->smdbc_close = smdb1_cursor_close;
    cur->smdbc_del = smdb1_cursor_del;
    cur->smdbc_get = smdb1_cursor_get;
    cur->smdbc_put = smdb1_cursor_put;
    *cursor = cur;

    return SMDBE_OK;
}
/*
**  SMDB_DB_OPEN -- Opens a db1 database.
**
**  Parameters:
**      database -- An unallocated database pointer to a pointer.
**      db_name -- The name of the database without extension.
**      mode -- File permisions on the database if created.
**      mode_mask -- Mode bits that must match on an existing database.
**      sff -- Flags for safefile.
**      type -- The type of database to open
**          See smdb_type_to_db1_type for valid types.
**      user_info -- Information on the user to use 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, otherwise errno.
*/

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;
    long sff;
    SMDB_DBTYPE type;
    SMDB_USER_INFO *user_info;
    SMDB_DBPARAMS *db_params;
{
    bool lockcreated = false;
    int db_fd;
    int lock_fd;
    int result;
    void *params;
    SMDB_DATABASE *smdb_db;
    SMDB_DB1_DATABASE *db1;
    DB *db;
    HASHINFO hash_info;
    BTREEINFO btree_info;
    DBTYPE db_type;
    struct stat stat_info;
    char db_file_name[MAXPATHLEN];

    if (type == NULL ||
        (strncmp(SMDB_TYPE_HASH, type, SMDB_TYPE_HASH_LEN) != 0 &&
         strncmp(SMDB_TYPE_BTREE, type, SMDB_TYPE_BTREE_LEN) != 0))
        return SMDBE_UNKNOWN_DB_TYPE;

    result = smdb_add_extension(db_file_name, sizeof db_file_name,
                    db_name, SMDB1_FILE_EXTENSION);
    if (result != SMDBE_OK)
        return result;

    result = smdb_setup_file(db_name, SMDB1_FILE_EXTENSION, mode_mask,
                 sff, user_info, &stat_info);
    if (result != SMDBE_OK)
        return result;

    if (stat_info.st_mode == ST_MODE_NOFILE &&
        bitset(mode, O_CREAT))
        lockcreated = true;

    lock_fd = -1;
    result = smdb_lock_file(&lock_fd, db_name, mode, sff,
                SMDB1_FILE_EXTENSION);
    if (result != SMDBE_OK)
        return result;

    if (lockcreated)
    {
        mode |= O_TRUNC;
        mode &= ~(O_CREAT|O_EXCL);
    }

    *database = NULL;

    smdb_db = smdb_malloc_database();
    db1 = smdb1_malloc_database();
    if (smdb_db == NULL || db1 == NULL)
    {
        (void) smdb_unlock_file(lock_fd);
        smdb_free_database(smdb_db);
        free(db1);
        return SMDBE_MALLOC;
    }
    db1->smdb1_lock_fd = lock_fd;

    params = NULL;
    if (db_params != NULL &&
        (strncmp(SMDB_TYPE_HASH, type, SMDB_TYPE_HASH_LEN) == 0))
    {
        (void) memset(&hash_info, '\0', sizeof hash_info);
        hash_info.nelem = db_params->smdbp_num_elements;
        hash_info.cachesize = db_params->smdbp_cache_size;
        params = &hash_info;
    }

    if (db_params != NULL &&
        (strncmp(SMDB_TYPE_BTREE, type, SMDB_TYPE_BTREE_LEN) == 0))
    {
        (void) memset(&btree_info, '\0', sizeof btree_info);
        btree_info.cachesize = db_params->smdbp_cache_size;
        if (db_params->smdbp_allow_dup)
            btree_info.flags |= R_DUP;
        params = &btree_info;
    }

    db_type = smdb_type_to_db1_type(type);
    db = dbopen(db_file_name, mode, DBMMODE, db_type, params);
    if (db != NULL)
    {
        db_fd = db->fd(db);
        result = smdb_filechanged(db_name, SMDB1_FILE_EXTENSION, db_fd,
                      &stat_info);
    }
    else
    {
        if (errno == 0)
            result = SMDBE_BAD_OPEN;
        else
            result = errno;
    }

    if (result == SMDBE_OK)
    {
        /* Everything is ok. Setup driver */
        db1->smdb1_db = db;

        smdb_db->smdb_close = smdb1_close;
        smdb_db->smdb_del = smdb1_del;
        smdb_db->smdb_fd = smdb1_fd;
        smdb_db->smdb_lockfd = smdb1_lockfd;
        smdb_db->smdb_get = smdb1_get;
        smdb_db->smdb_put = smdb1_put;
        smdb_db->smdb_set_owner = smdb1_set_owner;
        smdb_db->smdb_sync = smdb1_sync;
        smdb_db->smdb_cursor = smdb1_cursor;
        smdb_db->smdb_impl = db1;

        *database = smdb_db;
        return SMDBE_OK;
    }

    if (db != NULL)
        (void) db->close(db);

    /* Error opening database */
    (void) smdb_unlock_file(db1->smdb1_lock_fd);
    free(db1);
    smdb_free_database(smdb_db);

    return result;
}

#endif /* (DB_VERSION_MAJOR == 1) */