text: /*
   * Copyright (c) 2013 Jan-Piet Mens <jp@mens.de>
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   * 
   * 1. Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of mosquitto nor the names of its
   *    contributors may be used to endorse or promote products derived from
   *    this software without specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifdef BE_CDB
  
  #include <stdio.h>
  #include <string.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <fcntl.h>
  #include <cdb.h>
  #include <mosquitto.h>
  #include "backends.h"
  #include "be-cdb.h"
  #include "log.h"
  #include "hash.h"
  
  void *be_cdb_init()
  {
  	struct cdb_backend *conf;
  	char *cdbname;
  	int fd;
  
  	if ((cdbname = p_stab("cdbname")) == NULL)
  		_fatal("Mandatory parameter `cdbname' missing");
  
  	if ((fd = open(cdbname, O_RDONLY)) == -1) {
  		perror(cdbname);
  		return (NULL);
  	}
  
  	conf = malloc(sizeof(struct cdb_backend));
  	if (conf == NULL) {
  		return (NULL);
  	}
  
  	conf->cdbname	= strdup(cdbname);
  	conf->cdb	= (struct cdb *)malloc(sizeof(struct cdb));
  
  	if (conf->cdb == NULL) {
  		free(conf->cdbname);
  		free(conf);
  		return (NULL);
  	}
  
  	cdb_init(conf->cdb, fd);
  
  	return (conf);
  }
  
  void be_cdb_destroy(void *handle)
  {
  	struct cdb_backend *conf = (struct cdb_backend *)handle;
  
  	if (conf) {
  		cdb_free(conf->cdb);
  		free(conf->cdbname);
  		free(conf);
  	}
  }
  
  int be_cdb_getuser(void *handle, const char *username, const char *password, char **phash, const char *clientid)
  {
  	struct cdb_backend *conf = (struct cdb_backend *)handle;
  	char *k, *v = NULL;
  	unsigned klen;
  
  	if (!conf || !username || !*username)
  		return (FALSE);
  
  	k = (char *)username;
  	klen = strlen(k);
  
  	if (cdb_find(conf->cdb, k, klen) > 0) {
  		int vpos = cdb_datapos(conf->cdb);
  		int vlen = cdb_datalen(conf->cdb);
  
  		if ((v = malloc(vlen + 1)) != NULL) {
  			cdb_read(conf->cdb, v, vlen, vpos);
  			v[vlen] = 0;
  		}
  	}
  
  	*phash = v;
  	return BACKEND_DEFER;
  }
  
  /*
   * Check access to topic for username. Look values for a key "acl:username"
   * and use mosquitto_auth_sub_topic_matches_acl() to validate the topic.
   */
  
  int be_cdb_access(void *handle, const char *username, char *topic)
  {
  	struct cdb_backend *conf = (struct cdb_backend *)handle;
  	char *k;
  	unsigned klen;
  	int found = 0;
  	struct cdb_find cdbf;
  	int bf = FALSE;
  
  	if (!conf || !username || !topic)
  		return (0);
  
  	if ((k = malloc(strlen(username) + strlen("acl:") + 2)) == NULL)
  		return (0);
  	sprintf(k, "acl:%s", username);
  	klen = strlen(k);
  
  	cdb_findinit(&cdbf, conf->cdb, k, klen);
  	while ((cdb_findnext(&cdbf) > 0) && (!found)) {
  		unsigned vpos = cdb_datapos(conf->cdb);
  		unsigned vlen = cdb_datalen(conf->cdb);
  		char *val;
  
  		val = malloc(vlen);
  		cdb_read(conf->cdb, val, vlen, vpos);
  
  		mosquitto_auth_sub_topic_matches_acl(val, topic, &bf);
  		found |= bf;
  
  		free(val);
  	}
  
  	free(k);
  
  	return (found > 0);
  }
  
  int be_cdb_superuser(void *handle, const char *username)
  {
  	return BACKEND_DEFER;
  }
  
  int be_cdb_aclcheck(void *handle, const char *clientid, const char *username, const char *topic, int acc)
  {
  	/* FIXME: implement. Currently TRUE */
  
  	return BACKEND_ALLOW;
  }
  #endif /* BE_CDB */
  