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a85b5759f3
These files were pulled from the 1.6.3 release tarball. This new version builds against OpenSSL version 1.1 which will be the default in the new Debian Stable which is due to be released RealSoonNow (tm).
607 lines
21 KiB
C
607 lines
21 KiB
C
/*
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* services/mesh.h - deal with mesh of query states and handle events for that.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains functions to assist in dealing with a mesh of
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* query states. This mesh is supposed to be thread-specific.
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* It consists of query states (per qname, qtype, qclass) and connections
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* between query states and the super and subquery states, and replies to
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* send back to clients.
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*/
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#ifndef SERVICES_MESH_H
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#define SERVICES_MESH_H
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#include "util/rbtree.h"
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#include "util/netevent.h"
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#include "util/data/msgparse.h"
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#include "util/module.h"
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#include "services/modstack.h"
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struct sldns_buffer;
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struct mesh_state;
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struct mesh_reply;
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struct mesh_cb;
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struct query_info;
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struct reply_info;
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struct outbound_entry;
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struct timehist;
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struct respip_client_info;
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/**
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* Maximum number of mesh state activations. Any more is likely an
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* infinite loop in the module. It is then terminated.
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*/
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#define MESH_MAX_ACTIVATION 3000
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/**
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* Max number of references-to-references-to-references.. search size.
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* Any more is treated like 'too large', and the creation of a new
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* dependency is failed (so that no loops can be created).
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*/
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#define MESH_MAX_SUBSUB 1024
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/**
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* Mesh of query states
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*/
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struct mesh_area {
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/** active module stack */
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struct module_stack mods;
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/** environment for new states */
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struct module_env* env;
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/** set of runnable queries (mesh_state.run_node) */
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rbtree_type run;
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/** rbtree of all current queries (mesh_state.node)*/
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rbtree_type all;
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/** count of the total number of mesh_reply entries */
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size_t num_reply_addrs;
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/** count of the number of mesh_states that have mesh_replies
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* Because a state can send results to multiple reply addresses,
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* this number must be equal or lower than num_reply_addrs. */
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size_t num_reply_states;
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/** number of mesh_states that have no mesh_replies, and also
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* an empty set of super-states, thus are 'toplevel' or detached
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* internal opportunistic queries */
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size_t num_detached_states;
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/** number of reply states in the forever list */
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size_t num_forever_states;
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/** max total number of reply states to have */
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size_t max_reply_states;
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/** max forever number of reply states to have */
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size_t max_forever_states;
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/** stats, cumulative number of reply states jostled out */
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size_t stats_jostled;
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/** stats, cumulative number of incoming client msgs dropped */
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size_t stats_dropped;
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/** number of replies sent */
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size_t replies_sent;
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/** sum of waiting times for the replies */
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struct timeval replies_sum_wait;
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/** histogram of time values */
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struct timehist* histogram;
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/** (extended stats) secure replies */
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size_t ans_secure;
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/** (extended stats) bogus replies */
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size_t ans_bogus;
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/** (extended stats) rcodes in replies */
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size_t ans_rcode[16];
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/** (extended stats) rcode nodata in replies */
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size_t ans_nodata;
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/** backup of query if other operations recurse and need the
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* network buffers */
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struct sldns_buffer* qbuf_bak;
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/** double linked list of the run-to-completion query states.
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* These are query states with a reply */
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struct mesh_state* forever_first;
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/** last entry in run forever list */
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struct mesh_state* forever_last;
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/** double linked list of the query states that can be jostled out
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* by new queries if too old. These are query states with a reply */
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struct mesh_state* jostle_first;
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/** last entry in jostle list - this is the entry that is newest */
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struct mesh_state* jostle_last;
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/** timeout for jostling. if age is lower, it does not get jostled. */
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struct timeval jostle_max;
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};
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/**
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* A mesh query state
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* Unique per qname, qtype, qclass (from the qstate).
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* And RD / CD flag; in case a client turns it off.
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* And priming queries are different from ordinary queries (because of hints).
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*
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* The entire structure is allocated in a region, this region is the qstate
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* region. All parts (rbtree nodes etc) are also allocated in the region.
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*/
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struct mesh_state {
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/** node in mesh_area all tree, key is this struct. Must be first. */
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rbnode_type node;
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/** node in mesh_area runnable tree, key is this struct */
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rbnode_type run_node;
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/** the query state. Note that the qinfo and query_flags
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* may not change. */
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struct module_qstate s;
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/** the list of replies to clients for the results */
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struct mesh_reply* reply_list;
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/** the list of callbacks for the results */
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struct mesh_cb* cb_list;
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/** set of superstates (that want this state's result)
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* contains struct mesh_state_ref* */
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rbtree_type super_set;
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/** set of substates (that this state needs to continue)
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* contains struct mesh_state_ref* */
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rbtree_type sub_set;
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/** number of activations for the mesh state */
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size_t num_activated;
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/** previous in linked list for reply states */
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struct mesh_state* prev;
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/** next in linked list for reply states */
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struct mesh_state* next;
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/** if this state is in the forever list, jostle list, or neither */
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enum mesh_list_select { mesh_no_list, mesh_forever_list,
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mesh_jostle_list } list_select;
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/** pointer to this state for uniqueness or NULL */
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struct mesh_state* unique;
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/** true if replies have been sent out (at end for alignment) */
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uint8_t replies_sent;
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};
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/**
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* Rbtree reference to a mesh_state.
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* Used in super_set and sub_set.
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*/
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struct mesh_state_ref {
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/** node in rbtree for set, key is this structure */
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rbnode_type node;
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/** the mesh state */
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struct mesh_state* s;
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};
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/**
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* Reply to a client
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*/
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struct mesh_reply {
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/** next in reply list */
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struct mesh_reply* next;
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/** the query reply destination, packet buffer and where to send. */
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struct comm_reply query_reply;
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/** edns data from query */
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struct edns_data edns;
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/** the time when request was entered */
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struct timeval start_time;
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/** id of query, in network byteorder. */
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uint16_t qid;
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/** flags of query, for reply flags */
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uint16_t qflags;
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/** qname from this query. len same as mesh qinfo. */
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uint8_t* qname;
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/** same as that in query_info. */
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struct local_rrset* local_alias;
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};
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/**
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* Mesh result callback func.
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* called as func(cb_arg, rcode, buffer_with_reply, security, why_bogus);
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*/
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typedef void (*mesh_cb_func_type)(void*, int, struct sldns_buffer*, enum sec_status,
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char*);
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/**
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* Callback to result routine
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*/
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struct mesh_cb {
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/** next in list */
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struct mesh_cb* next;
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/** edns data from query */
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struct edns_data edns;
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/** id of query, in network byteorder. */
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uint16_t qid;
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/** flags of query, for reply flags */
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uint16_t qflags;
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/** buffer for reply */
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struct sldns_buffer* buf;
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/** callback routine for results. if rcode != 0 buf has message.
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* called as cb(cb_arg, rcode, buf, sec_state);
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*/
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mesh_cb_func_type cb;
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/** user arg for callback */
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void* cb_arg;
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};
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/* ------------------- Functions for worker -------------------- */
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/**
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* Allocate mesh, to empty.
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* @param stack: module stack to activate, copied (as readonly reference).
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* @param env: environment for new queries.
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* @return mesh: the new mesh or NULL on error.
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*/
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struct mesh_area* mesh_create(struct module_stack* stack,
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struct module_env* env);
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/**
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* Delete mesh, and all query states and replies in it.
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* @param mesh: the mesh to delete.
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*/
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void mesh_delete(struct mesh_area* mesh);
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/**
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* New query incoming from clients. Create new query state if needed, and
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* add mesh_reply to it. Returns error to client on malloc failures.
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* Will run the mesh area queries to process if a new query state is created.
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*
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* @param mesh: the mesh.
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* @param qinfo: query from client.
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* @param cinfo: additional information associated with the query client.
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* 'cinfo' itself is ephemeral but data pointed to by its members
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* can be assumed to be valid and unchanged until the query processing is
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* completed.
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* @param qflags: flags from client query.
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* @param edns: edns data from client query.
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* @param rep: where to reply to.
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* @param qid: query id to reply with.
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*/
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void mesh_new_client(struct mesh_area* mesh, struct query_info* qinfo,
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struct respip_client_info* cinfo, uint16_t qflags,
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struct edns_data* edns, struct comm_reply* rep, uint16_t qid);
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/**
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* New query with callback. Create new query state if needed, and
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* add mesh_cb to it.
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* Will run the mesh area queries to process if a new query state is created.
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*
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* @param mesh: the mesh.
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* @param qinfo: query from client.
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* @param qflags: flags from client query.
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* @param edns: edns data from client query.
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* @param buf: buffer for reply contents.
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* @param qid: query id to reply with.
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* @param cb: callback function.
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* @param cb_arg: callback user arg.
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* @return 0 on error.
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*/
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int mesh_new_callback(struct mesh_area* mesh, struct query_info* qinfo,
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uint16_t qflags, struct edns_data* edns, struct sldns_buffer* buf,
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uint16_t qid, mesh_cb_func_type cb, void* cb_arg);
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/**
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* New prefetch message. Create new query state if needed.
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* Will run the mesh area queries to process if a new query state is created.
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*
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* @param mesh: the mesh.
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* @param qinfo: query from client.
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* @param qflags: flags from client query.
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* @param leeway: TTL leeway what to expire earlier for this update.
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*/
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void mesh_new_prefetch(struct mesh_area* mesh, struct query_info* qinfo,
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uint16_t qflags, time_t leeway);
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/**
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* Handle new event from the wire. A serviced query has returned.
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* The query state will be made runnable, and the mesh_area will process
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* query states until processing is complete.
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*
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* @param mesh: the query mesh.
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* @param e: outbound entry, with query state to run and reply pointer.
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* @param reply: the comm point reply info.
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* @param what: NETEVENT_* error code (if not 0, what is wrong, TIMEOUT).
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*/
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void mesh_report_reply(struct mesh_area* mesh, struct outbound_entry* e,
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struct comm_reply* reply, int what);
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/* ------------------- Functions for module environment --------------- */
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/**
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* Detach-subqueries.
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* Remove all sub-query references from this query state.
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* Keeps super-references of those sub-queries correct.
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* Updates stat items in mesh_area structure.
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* @param qstate: used to find mesh state.
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*/
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void mesh_detach_subs(struct module_qstate* qstate);
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/**
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* Attach subquery.
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* Creates it if it does not exist already.
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* Keeps sub and super references correct.
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* Performs a cycle detection - for double check - and fails if there is one.
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* Also fails if the sub-sub-references become too large.
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* Updates stat items in mesh_area structure.
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* Pass if it is priming query or not.
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* return:
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* o if error (malloc) happened.
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* o need to initialise the new state (module init; it is a new state).
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* so that the next run of the query with this module is successful.
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* o no init needed, attachment successful.
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*
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* @param qstate: the state to find mesh state, and that wants to receive
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* the results from the new subquery.
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* @param qinfo: what to query for (copied).
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* @param qflags: what flags to use (RD / CD flag or not).
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* @param prime: if it is a (stub) priming query.
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* @param valrec: if it is a validation recursion query (lookup of key, DS).
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* @param newq: If the new subquery needs initialisation, it is returned,
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* otherwise NULL is returned.
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* @return: false on error, true if success (and init may be needed).
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*/
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int mesh_attach_sub(struct module_qstate* qstate, struct query_info* qinfo,
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uint16_t qflags, int prime, int valrec, struct module_qstate** newq);
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/**
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* Query state is done, send messages to reply entries.
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* Encode messages using reply entry values and the querystate (with original
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* qinfo), using given reply_info.
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* Pass errcode != 0 if an error reply is needed.
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* If no reply entries, nothing is done.
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* Must be called before a module can module_finished or return module_error.
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* The module must handle the super query states itself as well.
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*
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* @param mstate: mesh state that is done. return_rcode and return_msg
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* are used for replies.
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* return_rcode: if not 0 (NOERROR) an error is sent back (and
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* return_msg is ignored).
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* return_msg: reply to encode and send back to clients.
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*/
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void mesh_query_done(struct mesh_state* mstate);
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/**
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* Call inform_super for the super query states that are interested in the
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* results from this query state. These can then be changed for error
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* or results.
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* Called when a module is module_finished or returns module_error.
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* The super query states become runnable with event module_event_pass,
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* it calls the current module for the super with the inform_super event.
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*
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* @param mesh: mesh area to add newly runnable modules to.
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* @param mstate: the state that has results, used to find mesh state.
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*/
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void mesh_walk_supers(struct mesh_area* mesh, struct mesh_state* mstate);
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/**
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* Delete mesh state, cleanup and also rbtrees and so on.
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* Will detach from all super/subnodes.
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* @param qstate: to remove.
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*/
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void mesh_state_delete(struct module_qstate* qstate);
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/* ------------------- Functions for mesh -------------------- */
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/**
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* Create and initialize a new mesh state and its query state
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* Does not put the mesh state into rbtrees and so on.
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* @param env: module environment to set.
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* @param qinfo: query info that the mesh is for.
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* @param cinfo: control info for the query client (can be NULL).
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* @param qflags: flags for query (RD / CD flag).
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* @param prime: if true, it is a priming query, set is_priming on mesh state.
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* @param valrec: if true, it is a validation recursion query, and sets
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* is_valrec on the mesh state.
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* @return: new mesh state or NULL on allocation error.
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*/
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struct mesh_state* mesh_state_create(struct module_env* env,
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struct query_info* qinfo, struct respip_client_info* cinfo,
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uint16_t qflags, int prime, int valrec);
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/**
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* Check if the mesh state is unique.
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* A unique mesh state uses it's unique member to point to itself, else NULL.
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* @param mstate: mesh state to check.
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* @return true if the mesh state is unique, false otherwise.
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*/
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int mesh_state_is_unique(struct mesh_state* mstate);
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/**
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* Make a mesh state unique.
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* A unique mesh state uses it's unique member to point to itself.
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* @param mstate: mesh state to check.
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*/
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void mesh_state_make_unique(struct mesh_state* mstate);
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/**
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* Cleanup a mesh state and its query state. Does not do rbtree or
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* reference cleanup.
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* @param mstate: mesh state to cleanup. Its pointer may no longer be used
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* afterwards. Cleanup rbtrees before calling this function.
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*/
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void mesh_state_cleanup(struct mesh_state* mstate);
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/**
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* Delete all mesh states from the mesh.
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* @param mesh: the mesh area to clear
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*/
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void mesh_delete_all(struct mesh_area* mesh);
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/**
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* Find a mesh state in the mesh area. Pass relevant flags.
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*
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* @param mesh: the mesh area to look in.
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* @param cinfo: if non-NULL client specific info that may affect IP-based
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* actions that apply to the query result.
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* @param qinfo: what query
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* @param qflags: if RD / CD bit is set or not.
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* @param prime: if it is a priming query.
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* @param valrec: if it is a validation-recursion query.
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* @return: mesh state or NULL if not found.
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*/
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struct mesh_state* mesh_area_find(struct mesh_area* mesh,
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struct respip_client_info* cinfo, struct query_info* qinfo,
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uint16_t qflags, int prime, int valrec);
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/**
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* Setup attachment super/sub relation between super and sub mesh state.
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* The relation must not be present when calling the function.
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* Does not update stat items in mesh_area.
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* @param super: super state.
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* @param sub: sub state.
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* @return: 0 on alloc error.
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|
*/
|
|
int mesh_state_attachment(struct mesh_state* super, struct mesh_state* sub);
|
|
|
|
/**
|
|
* Create new reply structure and attach it to a mesh state.
|
|
* Does not update stat items in mesh area.
|
|
* @param s: the mesh state.
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|
* @param edns: edns data for reply (bufsize).
|
|
* @param rep: comm point reply info.
|
|
* @param qid: ID of reply.
|
|
* @param qflags: original query flags.
|
|
* @param qinfo: original query info.
|
|
* @return: 0 on alloc error.
|
|
*/
|
|
int mesh_state_add_reply(struct mesh_state* s, struct edns_data* edns,
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|
struct comm_reply* rep, uint16_t qid, uint16_t qflags,
|
|
const struct query_info* qinfo);
|
|
|
|
/**
|
|
* Create new callback structure and attach it to a mesh state.
|
|
* Does not update stat items in mesh area.
|
|
* @param s: the mesh state.
|
|
* @param edns: edns data for reply (bufsize).
|
|
* @param buf: buffer for reply
|
|
* @param cb: callback to call with results.
|
|
* @param cb_arg: callback user arg.
|
|
* @param qid: ID of reply.
|
|
* @param qflags: original query flags.
|
|
* @return: 0 on alloc error.
|
|
*/
|
|
int mesh_state_add_cb(struct mesh_state* s, struct edns_data* edns,
|
|
struct sldns_buffer* buf, mesh_cb_func_type cb, void* cb_arg,
|
|
uint16_t qid, uint16_t qflags);
|
|
|
|
/**
|
|
* Run the mesh. Run all runnable mesh states. Which can create new
|
|
* runnable mesh states. Until completion. Automatically called by
|
|
* mesh_report_reply and mesh_new_client as needed.
|
|
* @param mesh: mesh area.
|
|
* @param mstate: first mesh state to run.
|
|
* @param ev: event the mstate. Others get event_pass.
|
|
* @param e: if a reply, its outbound entry.
|
|
*/
|
|
void mesh_run(struct mesh_area* mesh, struct mesh_state* mstate,
|
|
enum module_ev ev, struct outbound_entry* e);
|
|
|
|
/**
|
|
* Print some stats about the mesh to the log.
|
|
* @param mesh: the mesh to print it for.
|
|
* @param str: descriptive string to go with it.
|
|
*/
|
|
void mesh_stats(struct mesh_area* mesh, const char* str);
|
|
|
|
/**
|
|
* Clear the stats that the mesh keeps (number of queries serviced)
|
|
* @param mesh: the mesh
|
|
*/
|
|
void mesh_stats_clear(struct mesh_area* mesh);
|
|
|
|
/**
|
|
* Print all the states in the mesh to the log.
|
|
* @param mesh: the mesh to print all states of.
|
|
*/
|
|
void mesh_log_list(struct mesh_area* mesh);
|
|
|
|
/**
|
|
* Calculate memory size in use by mesh and all queries inside it.
|
|
* @param mesh: the mesh to examine.
|
|
* @return size in bytes.
|
|
*/
|
|
size_t mesh_get_mem(struct mesh_area* mesh);
|
|
|
|
/**
|
|
* Find cycle; see if the given mesh is in the targets sub, or sub-sub, ...
|
|
* trees.
|
|
* If the sub-sub structure is too large, it returns 'a cycle'=2.
|
|
* @param qstate: given mesh querystate.
|
|
* @param qinfo: query info for dependency.
|
|
* @param flags: query flags of dependency.
|
|
* @param prime: if dependency is a priming query or not.
|
|
* @param valrec: if it is a validation recursion query (lookup of key, DS).
|
|
* @return true if the name,type,class exists and the given qstate mesh exists
|
|
* as a dependency of that name. Thus if qstate becomes dependent on
|
|
* name,type,class then a cycle is created, this is return value 1.
|
|
* Too large to search is value 2 (also true).
|
|
*/
|
|
int mesh_detect_cycle(struct module_qstate* qstate, struct query_info* qinfo,
|
|
uint16_t flags, int prime, int valrec);
|
|
|
|
/** compare two mesh_states */
|
|
int mesh_state_compare(const void* ap, const void* bp);
|
|
|
|
/** compare two mesh references */
|
|
int mesh_state_ref_compare(const void* ap, const void* bp);
|
|
|
|
/**
|
|
* Make space for another recursion state for a reply in the mesh
|
|
* @param mesh: mesh area
|
|
* @param qbuf: query buffer to save if recursion is invoked to make space.
|
|
* This buffer is necessary, because the following sequence in calls
|
|
* can result in an overwrite of the incoming query:
|
|
* delete_other_mesh_query - iter_clean - serviced_delete - waiting
|
|
* udp query is sent - on error callback - callback sends SERVFAIL reply
|
|
* over the same network channel, and shared UDP buffer is overwritten.
|
|
* You can pass NULL if there is no buffer that must be backed up.
|
|
* @return false if no space is available.
|
|
*/
|
|
int mesh_make_new_space(struct mesh_area* mesh, struct sldns_buffer* qbuf);
|
|
|
|
/**
|
|
* Insert mesh state into a double linked list. Inserted at end.
|
|
* @param m: mesh state.
|
|
* @param fp: pointer to the first-elem-pointer of the list.
|
|
* @param lp: pointer to the last-elem-pointer of the list.
|
|
*/
|
|
void mesh_list_insert(struct mesh_state* m, struct mesh_state** fp,
|
|
struct mesh_state** lp);
|
|
|
|
/**
|
|
* Remove mesh state from a double linked list. Remove from any position.
|
|
* @param m: mesh state.
|
|
* @param fp: pointer to the first-elem-pointer of the list.
|
|
* @param lp: pointer to the last-elem-pointer of the list.
|
|
*/
|
|
void mesh_list_remove(struct mesh_state* m, struct mesh_state** fp,
|
|
struct mesh_state** lp);
|
|
|
|
#endif /* SERVICES_MESH_H */
|