implemented a simple attribute provider for stroke
This commit is contained in:
Martin Willi
@@ -0,0 +1,318 @@
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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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* $Id$
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*/
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#include "stroke_attribute.h"
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#include <daemon.h>
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#include <utils/linked_list.h>
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#include <utils/mutex.h>
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#define POOL_LIMIT 16
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typedef struct private_stroke_attribute_t private_stroke_attribute_t;
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/**
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* private data of stroke_attribute
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*/
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struct private_stroke_attribute_t {
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/**
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* public functions
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*/
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stroke_attribute_t public;
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/**
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* list of pools, contains pool_t
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*/
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linked_list_t *pools;
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/**
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* mutex to lock access to pools
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*/
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mutex_t *mutex;
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};
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typedef struct {
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/** name of the pool */
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char *name;
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/** base address of the pool */
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host_t *base;
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/** number of entries in the pool */
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int count;
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/** array of in-use flags, TODO: use bit fields */
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u_int8_t *in_use;
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} pool_t;
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/**
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* destroy a pool_t
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*/
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static void pool_destroy(pool_t *this)
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{
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this->base->destroy(this->base);
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free(this->name);
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free(this->in_use);
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free(this);
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}
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/**
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* find a pool by name
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*/
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static pool_t *find_pool(private_stroke_attribute_t *this, char *name)
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{
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enumerator_t *enumerator;
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pool_t *current, *found = NULL;
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enumerator = this->pools->create_enumerator(this->pools);
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while (enumerator->enumerate(enumerator, ¤t))
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{
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if (streq(name, current->name))
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{
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found = current;
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break;
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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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* convert an pool offset to an address
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*/
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host_t* offset2host(pool_t *pool, int offset)
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{
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chunk_t addr;
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host_t *host;
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u_int32_t *pos;
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if (offset > pool->count)
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{
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return NULL;
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}
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addr = chunk_clone(pool->base->get_address(pool->base));
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if (pool->base->get_family(pool->base) == AF_INET6)
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{
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pos = (u_int32_t*)(addr.ptr + 12);
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}
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else
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{
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pos = (u_int32_t*)addr.ptr;
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}
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*pos = htonl(offset + ntohl(*pos));
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host = host_create_from_chunk(pool->base->get_family(pool->base), addr, 0);
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free(addr.ptr);
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return host;
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}
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/**
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* convert a host to a pool offset
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*/
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int host2offset(pool_t *pool, host_t *addr)
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{
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chunk_t host, base;
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u_int32_t hosti, basei;
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if (addr->get_family(addr) != pool->base->get_family(pool->base))
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{
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return -1;
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}
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host = addr->get_address(addr);
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base = pool->base->get_address(pool->base);
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if (addr->get_family(addr) == AF_INET6)
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{
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/* only look at last /32 block */
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if (!memeq(host.ptr, base.ptr, 12))
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{
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return -1;
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}
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host = chunk_skip(host, 12);
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base = chunk_skip(base, 12);
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}
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hosti = ntohl(*(u_int32_t*)(host.ptr));
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basei = ntohl(*(u_int32_t*)(base.ptr));
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if (hosti > basei + pool->count)
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{
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return -1;
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}
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return hosti - basei;
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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_stroke_attribute_t *this,
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char *name, identification_t *id,
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auth_info_t *auth, host_t *requested)
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{
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pool_t *pool;
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host_t *host = NULL;
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int i;
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this->mutex->lock(this->mutex);
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pool = find_pool(this, name);
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if (pool)
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{
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if (requested && !requested->is_anyaddr(requested))
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{
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i = host2offset(pool, requested);
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if (i >= 0 && !pool->in_use[i])
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{
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pool->in_use[i] = TRUE;
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host = requested->clone(requested);
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}
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}
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if (!host)
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{
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for (i = 0; i < pool->count; i++)
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{
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if (!pool->in_use[i])
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{
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pool->in_use[i] = TRUE;
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host = offset2host(pool, i);
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break;
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}
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}
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}
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}
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this->mutex->unlock(this->mutex);
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return host;
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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_stroke_attribute_t *this,
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char *name, host_t *address)
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{
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pool_t *pool;
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bool found = FALSE;
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int i;
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this->mutex->lock(this->mutex);
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pool = find_pool(this, name);
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if (pool)
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{
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i = host2offset(pool, address);
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if (i >= 0 && pool->in_use[i])
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{
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pool->in_use[i] = FALSE;
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found =TRUE;
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}
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}
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this->mutex->unlock(this->mutex);
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return found;
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}
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/**
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* Implementation of stroke_attribute_t.add_pool.
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*/
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static void add_pool(private_stroke_attribute_t *this, stroke_msg_t *msg)
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{
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if (msg->add_conn.other.sourceip && msg->add_conn.other.sourceip_size)
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{
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pool_t *pool;
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u_int32_t bits;
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int family;
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DBG1(DBG_CFG, "adding virtual IP address pool '%s': %s/%d",
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msg->add_conn.name, msg->add_conn.other.sourceip,
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msg->add_conn.other.sourceip_size);
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pool = malloc_thing(pool_t);
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pool->base = host_create_from_string(msg->add_conn.other.sourceip, 0);
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if (!pool->base)
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{
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free(pool);
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DBG1(DBG_CFG, "virtual IP address invalid, discarded");
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return;
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}
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pool->name = strdup(msg->add_conn.name);
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family = pool->base->get_family(pool->base);
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bits = (family == AF_INET ? 32 : 128) - msg->add_conn.other.sourceip_size;
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if (bits > POOL_LIMIT)
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{
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bits = POOL_LIMIT;
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DBG1(DBG_CFG, "virtual IP pool to large, limiting to %s/%d",
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msg->add_conn.other.sourceip,
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(family == AF_INET ? 32 : 128) - bits);
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}
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pool->count = 1 << (bits);
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pool->in_use = calloc(pool->count, sizeof(u_int8_t));
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if (pool->count > 2)
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{ /* do not use first and last addresses of a block */
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pool->in_use[0] = TRUE;
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pool->in_use[pool->count-1] = TRUE;
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}
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this->mutex->lock(this->mutex);
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this->pools->insert_last(this->pools, pool);
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this->mutex->unlock(this->mutex);
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}
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}
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/**
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* Implementation of stroke_attribute_t.del_pool.
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*/
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static void del_pool(private_stroke_attribute_t *this, stroke_msg_t *msg)
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{
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enumerator_t *enumerator;
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pool_t *pool;
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this->mutex->lock(this->mutex);
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enumerator = this->pools->create_enumerator(this->pools);
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while (enumerator->enumerate(enumerator, &pool))
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{
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if (streq(msg->del_conn.name, pool->name))
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{
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this->pools->remove_at(this->pools, enumerator);
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pool_destroy(pool);
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break;
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}
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}
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enumerator->destroy(enumerator);
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this->mutex->unlock(this->mutex);
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}
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/**
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* Implementation of stroke_attribute_t.destroy
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*/
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static void destroy(private_stroke_attribute_t *this)
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{
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this->mutex->destroy(this->mutex);
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this->pools->destroy_function(this->pools, (void*)pool_destroy);
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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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stroke_attribute_t *stroke_attribute_create()
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{
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private_stroke_attribute_t *this = malloc_thing(private_stroke_attribute_t);
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this->public.provider.acquire_address = (host_t*(*)(attribute_provider_t *this, char*, identification_t *,auth_info_t *, host_t *))acquire_address;
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this->public.provider.release_address = (bool(*)(attribute_provider_t *this, char*,host_t *))release_address;
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this->public.add_pool = (void(*)(stroke_attribute_t*, stroke_msg_t *msg))add_pool;
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this->public.del_pool = (void(*)(stroke_attribute_t*, stroke_msg_t *msg))del_pool;
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this->public.destroy = (void(*)(stroke_attribute_t*))destroy;
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this->pools = linked_list_create();
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this->mutex = mutex_create(MUTEX_DEFAULT);
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return &this->public;
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}
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