attr: Move plugin to libcharon
This commit is contained in:
Martin Willi
@@ -0,0 +1,329 @@
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/*
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* Copyright (C) 2010 Tobias Brunner
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* Copyright (C) 2009 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 "attr_provider.h"
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#include <time.h>
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#include <hydra.h>
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#include <utils/debug.h>
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#include <collections/linked_list.h>
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#include <threading/rwlock.h>
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#define SERVER_MAX 2
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typedef struct private_attr_provider_t private_attr_provider_t;
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typedef struct attribute_entry_t attribute_entry_t;
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/**
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* private data of attr_provider
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*/
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struct private_attr_provider_t {
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/**
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* public functions
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*/
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attr_provider_t public;
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/**
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* List of attributes, attribute_entry_t
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*/
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linked_list_t *attributes;
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/**
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* Lock for attribute list
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*/
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rwlock_t *lock;
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};
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struct attribute_entry_t {
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/** type of attribute */
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configuration_attribute_type_t type;
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/** attribute value */
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chunk_t value;
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};
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/**
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* Destroy an entry
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*/
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static void attribute_destroy(attribute_entry_t *this)
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{
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free(this->value.ptr);
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free(this);
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}
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/**
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* convert enumerator value from attribute_entry
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*/
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static bool attr_enum_filter(void *null, attribute_entry_t **in,
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configuration_attribute_type_t *type, void* none, chunk_t *value)
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{
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*type = (*in)->type;
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*value = (*in)->value;
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return TRUE;
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}
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METHOD(attribute_provider_t, create_attribute_enumerator, enumerator_t*,
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private_attr_provider_t *this, linked_list_t *pools,
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identification_t *id, linked_list_t *vips)
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{
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if (vips->get_count(vips))
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{
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this->lock->read_lock(this->lock);
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return enumerator_create_filter(
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this->attributes->create_enumerator(this->attributes),
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(void*)attr_enum_filter, this->lock, (void*)this->lock->unlock);
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}
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return enumerator_create_empty();
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}
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METHOD(attr_provider_t, destroy, void,
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private_attr_provider_t *this)
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{
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this->attributes->destroy_function(this->attributes,
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(void*)attribute_destroy);
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this->lock->destroy(this->lock);
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free(this);
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}
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/**
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* Add an attribute entry to the list
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*/
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static void add_legacy_entry(private_attr_provider_t *this, char *key, int nr,
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configuration_attribute_type_t type)
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{
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attribute_entry_t *entry;
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host_t *host;
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char *str;
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str = lib->settings->get_str(lib->settings, "%s.%s%d", NULL, lib->ns,
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key, nr);
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if (str)
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{
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host = host_create_from_string(str, 0);
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if (host)
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{
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entry = malloc_thing(attribute_entry_t);
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if (host->get_family(host) == AF_INET6)
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{
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switch (type)
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{
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case INTERNAL_IP4_DNS:
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type = INTERNAL_IP6_DNS;
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break;
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case INTERNAL_IP4_NBNS:
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type = INTERNAL_IP6_NBNS;
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break;
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default:
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break;
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}
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}
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entry->type = type;
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entry->value = chunk_clone(host->get_address(host));
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host->destroy(host);
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DBG2(DBG_CFG, "loaded legacy entry attribute %N: %#B",
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configuration_attribute_type_names, entry->type, &entry->value);
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this->attributes->insert_last(this->attributes, entry);
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}
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}
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}
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/**
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* Key to attribute type mappings, for v4 and v6 attributes
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*/
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typedef struct {
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char *name;
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configuration_attribute_type_t v4;
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configuration_attribute_type_t v6;
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} attribute_type_key_t;
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static attribute_type_key_t keys[] = {
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{"address", INTERNAL_IP4_ADDRESS, INTERNAL_IP6_ADDRESS},
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{"dns", INTERNAL_IP4_DNS, INTERNAL_IP6_DNS},
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{"nbns", INTERNAL_IP4_NBNS, INTERNAL_IP6_NBNS},
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{"dhcp", INTERNAL_IP4_DHCP, INTERNAL_IP6_DHCP},
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{"netmask", INTERNAL_IP4_NETMASK, INTERNAL_IP6_NETMASK},
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{"server", INTERNAL_IP4_SERVER, INTERNAL_IP6_SERVER},
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{"subnet", INTERNAL_IP4_SUBNET, INTERNAL_IP6_SUBNET},
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{"split-include", UNITY_SPLIT_INCLUDE, UNITY_SPLIT_INCLUDE},
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{"split-exclude", UNITY_LOCAL_LAN, UNITY_LOCAL_LAN},
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};
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/**
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* Load (numerical) entries from the plugins.attr namespace
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*/
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static void load_entries(private_attr_provider_t *this)
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{
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enumerator_t *enumerator, *tokens;
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char *key, *value, *token;
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int i;
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for (i = 1; i <= SERVER_MAX; i++)
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{
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add_legacy_entry(this, "dns", i, INTERNAL_IP4_DNS);
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add_legacy_entry(this, "nbns", i, INTERNAL_IP4_NBNS);
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}
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enumerator = lib->settings->create_key_value_enumerator(lib->settings,
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"%s.plugins.attr", lib->ns);
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while (enumerator->enumerate(enumerator, &key, &value))
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{
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configuration_attribute_type_t type;
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attribute_type_key_t *mapped = NULL;
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attribute_entry_t *entry;
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chunk_t data;
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host_t *host;
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char *pos;
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int i, mask = -1, family;
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if (streq(key, "load"))
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{
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continue;
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}
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type = atoi(key);
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if (!type)
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{
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for (i = 0; i < countof(keys); i++)
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{
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if (streq(key, keys[i].name))
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{
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mapped = &keys[i];
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break;
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}
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}
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if (!mapped)
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{
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DBG1(DBG_CFG, "mapping attribute type %s failed", key);
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continue;
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}
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}
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tokens = enumerator_create_token(value, ",", " ");
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while (tokens->enumerate(tokens, &token))
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{
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pos = strchr(token, '/');
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if (pos)
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{
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*(pos++) = '\0';
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mask = atoi(pos);
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}
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host = host_create_from_string(token, 0);
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if (!host)
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{
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if (mapped)
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{
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DBG1(DBG_CFG, "invalid host in key %s: %s", key, token);
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continue;
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}
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/* store numeric attributes that are no IP addresses as strings */
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data = chunk_clone(chunk_from_str(token));
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}
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else
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{
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family = host->get_family(host);
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if (mask == -1)
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{
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data = chunk_clone(host->get_address(host));
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}
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else
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{
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if (family == AF_INET)
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{ /* IPv4 attributes contain a subnet mask */
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u_int32_t netmask = 0;
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if (mask)
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{ /* shifting u_int32_t by 32 or more is undefined */
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mask = 32 - mask;
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netmask = htonl((0xFFFFFFFF >> mask) << mask);
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}
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data = chunk_cat("cc", host->get_address(host),
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chunk_from_thing(netmask));
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}
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else
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{ /* IPv6 addresses the prefix only */
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data = chunk_cat("cc", host->get_address(host),
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chunk_from_chars(mask));
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}
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}
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host->destroy(host);
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if (mapped)
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{
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switch (family)
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{
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case AF_INET:
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type = mapped->v4;
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break;
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case AF_INET6:
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type = mapped->v6;
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break;
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}
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}
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}
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INIT(entry,
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.type = type,
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.value = data,
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);
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DBG2(DBG_CFG, "loaded attribute %N: %#B",
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configuration_attribute_type_names, entry->type, &entry->value);
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this->attributes->insert_last(this->attributes, entry);
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}
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tokens->destroy(tokens);
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}
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enumerator->destroy(enumerator);
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}
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METHOD(attr_provider_t, reload, void,
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private_attr_provider_t *this)
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{
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this->lock->write_lock(this->lock);
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this->attributes->destroy_function(this->attributes, (void*)attribute_destroy);
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this->attributes = linked_list_create();
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load_entries(this);
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DBG1(DBG_CFG, "loaded %d entr%s for attr plugin configuration",
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this->attributes->get_count(this->attributes),
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this->attributes->get_count(this->attributes) == 1 ? "y" : "ies");
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this->lock->unlock(this->lock);
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}
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/*
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* see header file
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*/
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attr_provider_t *attr_provider_create(database_t *db)
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{
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private_attr_provider_t *this;
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INIT(this,
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.public = {
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.provider = {
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.acquire_address = (void*)return_null,
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.release_address = (void*)return_false,
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.create_attribute_enumerator = _create_attribute_enumerator,
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},
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.reload = _reload,
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.destroy = _destroy,
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},
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.attributes = linked_list_create(),
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.lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
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);
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load_entries(this);
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return &this->public;
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}
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