Moving attr-sql plugin from libstrongswan to libhydra.
This commit is contained in:
Tobias Brunner
@@ -0,0 +1,384 @@
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/*
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* Copyright (C) 2008 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <time.h>
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#include <debug.h>
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#include <library.h>
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#include "sql_attribute.h"
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typedef struct private_sql_attribute_t private_sql_attribute_t;
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/**
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* private data of sql_attribute
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*/
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struct private_sql_attribute_t {
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/**
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* public functions
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*/
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sql_attribute_t public;
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/**
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* database connection
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*/
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database_t *db;
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/**
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* wheter to record lease history in lease table
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*/
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bool history;
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};
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/**
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* lookup/insert an identity
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*/
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static u_int get_identity(private_sql_attribute_t *this, identification_t *id)
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{
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enumerator_t *e;
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u_int row;
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/* look for peer identity in the identities table */
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e = this->db->query(this->db,
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"SELECT id FROM identities WHERE type = ? AND data = ?",
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DB_INT, id->get_type(id), DB_BLOB, id->get_encoding(id),
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DB_UINT);
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if (e && e->enumerate(e, &row))
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{
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e->destroy(e);
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return row;
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}
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DESTROY_IF(e);
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/* not found, insert new one */
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if (this->db->execute(this->db, &row,
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"INSERT INTO identities (type, data) VALUES (?, ?)",
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DB_INT, id->get_type(id), DB_BLOB, id->get_encoding(id)) == 1)
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{
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return row;
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}
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return 0;
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}
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/**
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* Lookup pool by name
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*/
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static u_int get_pool(private_sql_attribute_t *this, char *name, u_int *timeout)
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{
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enumerator_t *e;
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u_int pool;
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e = this->db->query(this->db, "SELECT id, timeout FROM pools WHERE name = ?",
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DB_TEXT, name, DB_UINT, DB_UINT);
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if (e && e->enumerate(e, &pool, timeout))
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{
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e->destroy(e);
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return pool;
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}
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DESTROY_IF(e);
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return 0;
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}
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/**
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* Look up an existing lease
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*/
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static host_t* check_lease(private_sql_attribute_t *this, char *name,
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u_int pool, u_int identity)
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{
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while (TRUE)
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{
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u_int id;
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chunk_t address;
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enumerator_t *e;
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time_t now = time(NULL);
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e = this->db->query(this->db,
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"SELECT id, address FROM addresses "
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"WHERE pool = ? AND identity = ? AND released != 0 LIMIT 1",
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DB_UINT, pool, DB_UINT, identity, DB_UINT, DB_BLOB);
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if (!e || !e->enumerate(e, &id, &address))
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{
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DESTROY_IF(e);
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break;
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}
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address = chunk_clonea(address);
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e->destroy(e);
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if (this->db->execute(this->db, NULL,
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"UPDATE addresses SET acquired = ?, released = 0 "
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"WHERE id = ? AND identity = ? AND released != 0",
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DB_UINT, now, DB_UINT, id, DB_UINT, identity) > 0)
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{
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host_t *host;
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host = host_create_from_chunk(AF_UNSPEC, address, 0);
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if (host)
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{
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DBG1("acquired existing lease for address %H in pool '%s'",
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host, name);
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return host;
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}
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}
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}
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return NULL;
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}
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/**
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* We check for unallocated addresses or expired leases. First we select an
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* address as a candidate, but double check later on if it is still available
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* during the update operation. This allows us to work without locking.
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*/
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static host_t* get_lease(private_sql_attribute_t *this, char *name,
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u_int pool, u_int timeout, u_int identity)
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{
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while (TRUE)
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{
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u_int id;
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chunk_t address;
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enumerator_t *e;
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time_t now = time(NULL);
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int hits;
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if (timeout)
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{
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/* check for an expired lease */
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e = this->db->query(this->db,
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"SELECT id, address FROM addresses "
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"WHERE pool = ? AND released != 0 AND released < ? LIMIT 1",
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DB_UINT, pool, DB_UINT, now - timeout, DB_UINT, DB_BLOB);
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}
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else
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{
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/* with static leases, check for an unallocated address */
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e = this->db->query(this->db,
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"SELECT id, address FROM addresses "
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"WHERE pool = ? AND identity = 0 LIMIT 1",
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DB_UINT, pool, DB_UINT, DB_BLOB);
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}
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if (!e || !e->enumerate(e, &id, &address))
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{
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DESTROY_IF(e);
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break;
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}
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address = chunk_clonea(address);
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e->destroy(e);
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if (timeout)
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{
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hits = this->db->execute(this->db, NULL,
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"UPDATE addresses SET "
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"acquired = ?, released = 0, identity = ? "
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"WHERE id = ? AND released != 0 AND released < ?",
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DB_UINT, now, DB_UINT, identity,
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DB_UINT, id, DB_UINT, now - timeout);
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}
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else
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{
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hits = this->db->execute(this->db, NULL,
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"UPDATE addresses SET "
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"acquired = ?, released = 0, identity = ? "
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"WHERE id = ? AND identity = 0",
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DB_UINT, now, DB_UINT, identity, DB_UINT, id);
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}
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if (hits > 0)
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{
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host_t *host;
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host = host_create_from_chunk(AF_UNSPEC, address, 0);
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if (host)
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{
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DBG1("acquired new lease for address %H in pool '%s'",
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host, name);
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return host;
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}
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}
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}
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DBG1("no available address found in pool '%s'", name);
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return NULL;
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}
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/**
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* Implementation of attribute_provider_t.acquire_address
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*/
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static host_t* acquire_address(private_sql_attribute_t *this,
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char *names, identification_t *id,
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host_t *requested)
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{
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host_t *address = NULL;
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u_int identity, pool, timeout;
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identity = get_identity(this, id);
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if (identity)
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{
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/* check for a single pool first (no concatenation and enumeration) */
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if (strchr(names, ',') == NULL)
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{
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pool = get_pool(this, names, &timeout);
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if (pool)
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{
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/* check for an existing lease */
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address = check_lease(this, names, pool, identity);
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if (address == NULL)
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{
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/* get an unallocated address or expired lease */
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address = get_lease(this, names, pool, timeout, identity);
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}
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}
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}
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else
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{
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enumerator_t *enumerator;
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char *name;
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/* in a first step check for an existing lease over all pools */
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enumerator = enumerator_create_token(names, ",", " ");
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while (enumerator->enumerate(enumerator, &name))
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{
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pool = get_pool(this, name, &timeout);
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if (pool)
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{
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address = check_lease(this, name, pool, identity);
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if (address)
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{
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enumerator->destroy(enumerator);
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return address;
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}
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}
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}
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enumerator->destroy(enumerator);
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/* in a second step get an unallocated address or expired lease */
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enumerator = enumerator_create_token(names, ",", " ");
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while (enumerator->enumerate(enumerator, &name))
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{
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pool = get_pool(this, name, &timeout);
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if (pool)
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{
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address = get_lease(this, name, pool, timeout, identity);
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if (address)
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{
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break;
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}
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}
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}
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enumerator->destroy(enumerator);
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}
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}
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return address;
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}
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/**
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* Implementation of attribute_provider_t.release_address
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*/
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static bool release_address(private_sql_attribute_t *this,
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char *name, host_t *address, identification_t *id)
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{
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enumerator_t *enumerator;
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bool found = FALSE;
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time_t now = time(NULL);
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enumerator = enumerator_create_token(name, ",", " ");
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while (enumerator->enumerate(enumerator, &name))
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{
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u_int pool, timeout;
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pool = get_pool(this, name, &timeout);
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if (pool)
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{
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if (this->history)
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{
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this->db->execute(this->db, NULL,
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"INSERT INTO leases (address, identity, acquired, released)"
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" SELECT id, identity, acquired, ? FROM addresses "
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" WHERE pool = ? AND address = ?",
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DB_UINT, now, DB_UINT, pool,
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DB_BLOB, address->get_address(address));
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}
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if (this->db->execute(this->db, NULL,
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"UPDATE addresses SET released = ? WHERE "
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"pool = ? AND address = ?", DB_UINT, time(NULL),
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DB_UINT, pool, DB_BLOB, address->get_address(address)) > 0)
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{
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found = TRUE;
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break;
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}
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}
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}
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enumerator->destroy(enumerator);
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return found;
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}
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/**
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* Implementation of sql_attribute_t.create_attribute_enumerator
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*/
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static enumerator_t* create_attribute_enumerator(private_sql_attribute_t *this,
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identification_t *id, host_t *vip)
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{
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if (vip)
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{
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enumerator_t *enumerator;
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enumerator = this->db->query(this->db,
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"SELECT type, value FROM attributes", DB_INT, DB_BLOB);
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if (enumerator)
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{
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return enumerator;
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}
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}
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return enumerator_create_empty();
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}
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/**
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* Implementation of sql_attribute_t.destroy
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*/
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static void destroy(private_sql_attribute_t *this)
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{
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free(this);
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}
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/*
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* see header file
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*/
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sql_attribute_t *sql_attribute_create(database_t *db)
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{
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private_sql_attribute_t *this = malloc_thing(private_sql_attribute_t);
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time_t now = time(NULL);
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this->public.provider.acquire_address = (host_t*(*)(attribute_provider_t *this, char*, identification_t *, host_t *))acquire_address;
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this->public.provider.release_address = (bool(*)(attribute_provider_t *this, char*,host_t *, identification_t*))release_address;
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this->public.provider.create_attribute_enumerator = (enumerator_t*(*)(attribute_provider_t*, identification_t *id, host_t *host))create_attribute_enumerator;
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this->public.destroy = (void(*)(sql_attribute_t*))destroy;
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this->db = db;
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this->history = lib->settings->get_bool(lib->settings,
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"libstrongswan.plugins.attr-sql.lease_history", TRUE);
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/* close any "online" leases in the case we crashed */
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if (this->history)
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{
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this->db->execute(this->db, NULL,
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"INSERT INTO leases (address, identity, acquired, released)"
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" SELECT id, identity, acquired, ? FROM addresses "
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" WHERE released = 0", DB_UINT, now);
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}
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this->db->execute(this->db, NULL,
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"UPDATE addresses SET released = ? WHERE released = 0",
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DB_UINT, now);
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return &this->public;
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}
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