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/*
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*
* $Id$
*/
#include "sql_attribute.h"
#include <daemon.h>
typedef struct private_sql_attribute_t private_sql_attribute_t;
/**
* private data of sql_attribute
*/
struct private_sql_attribute_t {
/**
* public functions
*/
sql_attribute_t public;
/**
* database connection
*/
database_t *db;
};
/**
* convert a address blob to an ip of the correct family
*/
static host_t *ip_from_chunk(chunk_t address)
{
switch (address.len)
{
case 4:
return host_create_from_chunk(AF_INET, address, 0);
case 16:
return host_create_from_chunk(AF_INET6, address, 0);
default:
return NULL;
}
}
/**
* increment a chunk, as it would reprensent a network order integer
*/
static void increment_chunk(chunk_t chunk)
{
int i;
for (i = chunk.len - 1; i >= 0; i++)
{
if (++chunk.ptr[i] != 0)
{
return;
}
}
}
/**
* Lookup if we have an existing lease
*/
static host_t* get_lease(private_sql_attribute_t *this,
char *name, identification_t *id)
{
enumerator_t *e;
chunk_t address;
host_t *ip = NULL;
int lease;
POS;
e = this->db->query(this->db,
"SELECT l.id, l.address FROM leases AS l "
"JOIN pools AS p ON l.pool = p.id "
"JOIN identities AS i ON l.identity = i.id "
"WHERE p.name = ? AND i.type = ? AND i.data = ? "
"AND (l.release ISNULL OR p.timeout ISNULL "
" OR (l.release < (p.timeout + l.acquire))) "
"ORDER BY l.acquire LIMIT 1", DB_TEXT, name,
DB_INT, id->get_type(id), DB_BLOB, id->get_encoding(id),
DB_INT, DB_BLOB);
if (e)
{
if (e->enumerate(e, &lease, &address))
{
if (this->db->execute(this->db, NULL,
"UPDATE leases SET release = NULL WHERE id = ?",
DB_INT, lease) > 0)
{
POS;
ip = ip_from_chunk(address);
}
}
e->destroy(e);
}
return ip;
}
/**
* Create a new lease entry for client
*/
static host_t* create_lease(private_sql_attribute_t *this,
char *name, identification_t *id)
{
enumerator_t *e, *f;
chunk_t address;
host_t *ip = NULL;
int pool, identity = 0;
POS;
e = this->db->query(this->db,
"SELECT id, next FROM pools WHERE name = ? AND next <= end",
DB_TEXT, name,
DB_INT, DB_BLOB);
if (!e)
{
return NULL;
}
if (e->enumerate(e, &pool, &address))
{
f = this->db->query(this->db,
"SELECT id FROM identities WHERE type = ? AND data = ?",
DB_INT, id->get_type(id), DB_BLOB, id->get_encoding(id),
DB_INT);
if (f)
{
if (!f->enumerate(f, &identity))
{
this->db->execute(this->db, &identity,
"INSERT INTO identities (type, data) VALUES (?, ?)",
DB_INT, id->get_type(id), DB_BLOB, id->get_encoding(id));
}
f->destroy(f);
}
if (identity)
{
if (this->db->execute(this->db, NULL,
"INSERT INTO leases "
"(pool, address, identity) VALUES (?, ?, ?)",
DB_INT, pool, DB_BLOB, address, DB_INT, identity) > 0)
{
POS;
ip = ip_from_chunk(address);
increment_chunk(address);
this->db->execute(this->db, NULL,
"UPDATE pools set next = ? WHERE id = ?",
DB_BLOB, address, DB_INT, pool);
}
}
}
e->destroy(e);
return ip;
}
/**
* Implementation of attribute_provider_t.acquire_address
*/
static host_t* acquire_address(private_sql_attribute_t *this,
char *name, identification_t *id,
auth_info_t *auth, host_t *requested)
{
host_t *ip;
ip = get_lease(this, name, id);
if (!ip)
{
ip = create_lease(this, name, id);
}
return ip;
}
/**
* Implementation of attribute_provider_t.release_address
*/
static bool release_address(private_sql_attribute_t *this,
char *name, host_t *address)
{
if (this->db->execute(this->db, NULL,
"UPDATE leases SET release = DATE('NOW') WHERE "
"pool IN (SELECT id FROM pools WHERE name = ?) AND "
"address = ? "
"ORDER BY acquire LIMIT 1",
DB_TEXT, name, DB_BLOB, address->get_address(address)) > 0)
{
POS;
return TRUE;
}
return FALSE;
}
/**
* Implementation of sql_attribute_t.destroy
*/
static void destroy(private_sql_attribute_t *this)
{
free(this);
}
/*
* see header file
*/
sql_attribute_t *sql_attribute_create(database_t *db)
{
private_sql_attribute_t *this = malloc_thing(private_sql_attribute_t);
this->public.provider.acquire_address = (host_t*(*)(attribute_provider_t *this, char*, identification_t *,auth_info_t *, host_t *))acquire_address;
this->public.provider.release_address = (bool(*)(attribute_provider_t *this, char*,host_t *))release_address;
this->public.destroy = (void(*)(sql_attribute_t*))destroy;
this->db = db;
return &this->public;
}
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