231 lines
8.1 KiB
C
231 lines
8.1 KiB
C
/*
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* respip/respip.h - IP-based response modification module
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*/
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/**
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* \file
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*
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* This file contains a module that selectively modifies query responses
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* based on their AAAA/A IP addresses.
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*/
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#ifndef RESPIP_RESPIP_H
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#define RESPIP_RESPIP_H
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#include "util/module.h"
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#include "services/localzone.h"
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/**
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* Set of response IP addresses with associated actions and tags.
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* Forward declaration only here. Actual definition is hidden within the
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* module.
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*/
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struct respip_set;
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/**
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* Forward declaration for the structure that represents a node in the
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* respip_set address tree
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*/
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struct resp_addr;
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/**
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* Forward declaration for the structure that represents a tree of view data.
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*/
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struct views;
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struct respip_addr_info;
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/**
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* Client-specific attributes that can affect IP-based actions.
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* This is essentially a subset of acl_addr (except for respip_set) but
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* defined as a separate structure to avoid dependency on the daemon-specific
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* structure.
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* respip_set is supposed to refer to the response-ip set for the global view.
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*/
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struct respip_client_info {
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uint8_t* taglist;
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size_t taglen;
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uint8_t* tag_actions;
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size_t tag_actions_size;
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struct config_strlist** tag_datas;
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size_t tag_datas_size;
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struct view* view;
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struct respip_set* respip_set;
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};
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/**
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* Data items representing the result of response-ip processing.
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* Note: this structure currently only define a few members, but exists
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* as a separate struct mainly for the convenience of custom extensions.
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*/
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struct respip_action_info {
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enum respip_action action;
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struct respip_addr_info* addrinfo; /* set only for inform variants */
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};
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/**
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* Forward declaration for the structure that represents a node in the
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* respip_set address tree
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*/
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struct resp_addr;
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/**
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* Create response IP set.
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* @return new struct or NULL on error.
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*/
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struct respip_set* respip_set_create(void);
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/**
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* Delete response IP set.
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* @param set: to delete.
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*/
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void respip_set_delete(struct respip_set* set);
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/**
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* Apply response-ip config settings to the global (default) view.
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* It assumes exclusive access to set (no internal locks).
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* @param set: processed global respip config data
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* @param cfg: config data.
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* @return 1 on success, 0 on error.
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*/
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int respip_global_apply_cfg(struct respip_set* set, struct config_file* cfg);
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/**
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* Apply response-ip config settings in named views.
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* @param vs: view structures with processed config data
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* @param cfg: config data.
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* @param have_view_respip_cfg: set to true if any named view has respip
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* configuration; otherwise set to false
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* @return 1 on success, 0 on error.
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*/
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int respip_views_apply_cfg(struct views* vs, struct config_file* cfg,
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int* have_view_respip_cfg);
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/**
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* Merge two replies to build a complete CNAME chain.
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* It appends the content of 'tgt_rep' to 'base_rep', assuming (but not
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* checking) the former ends with a CNAME and the latter resolves its target.
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* A merged new reply will be built using 'region' and *new_repp will point
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* to the new one on success.
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* If the target reply would also be subject to a response-ip action for
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* 'cinfo', this function uses 'base_rep' as the merged reply, ignoring
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* 'tgt_rep'. This is for avoiding cases like a CNAME loop or failure of
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* applying an action to an address.
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* RRSIGs in 'tgt_rep' will be excluded in the merged reply, as the resulting
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* reply is assumed to be faked due to a response-ip action and can't be
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* considered secure in terms of DNSSEC.
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* The caller must ensure that neither 'base_rep' nor 'tgt_rep' can be modified
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* until this function returns.
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* @param base_rep: the reply info containing an incomplete CNAME.
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* @param qinfo: query info corresponding to 'base_rep'.
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* @param tgt_rep: the reply info that completes the CNAME chain.
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* @param cinfo: client info corresponding to 'base_rep'.
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* @param must_validate: whether 'tgt_rep' must be DNSSEC-validated.
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* @param new_repp: pointer placeholder for the merged reply. will be intact
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* on error.
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* @param region: allocator to build *new_repp.
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* @return 1 on success, 0 on error.
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*/
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int respip_merge_cname(struct reply_info* base_rep,
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const struct query_info* qinfo, const struct reply_info* tgt_rep,
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const struct respip_client_info* cinfo, int must_validate,
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struct reply_info** new_repp, struct regional* region);
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/**
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* See if any IP-based action should apply to any IP address of AAAA/A answer
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* record in the reply. If so, apply the action. In some cases it rewrites
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* the reply rrsets, in which case *new_repp will point to the updated reply
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* info. Depending on the action, some of the rrsets in 'rep' will be
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* shallow-copied into '*new_repp'; the caller must ensure that the rrsets
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* in 'rep' are valid throughout the lifetime of *new_repp, and it must
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* provide appropriate mutex if the rrsets can be shared by multiple threads.
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* @param qinfo: query info corresponding to the reply.
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* @param cinfo: client-specific info to identify the best matching action.
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* can be NULL.
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* @param rep: original reply info. must not be NULL.
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* @param new_repp: can be set to the rewritten reply info (intact on failure).
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* @param actinfo: result of response-ip processing
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* @param alias_rrset: must not be NULL.
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* @param search_only: if true, only check if an action would apply. actionp
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* will be set (or intact) accordingly but the modified reply won't be built.
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* @param region: allocator to build *new_repp.
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* @return 1 on success, 0 on error.
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*/
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int respip_rewrite_reply(const struct query_info* qinfo,
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const struct respip_client_info* cinfo,
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const struct reply_info *rep, struct reply_info** new_repp,
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struct respip_action_info* actinfo,
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struct ub_packed_rrset_key** alias_rrset,
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int search_only, struct regional* region);
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/**
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* Get the response-ip function block.
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* @return: function block with function pointers to response-ip methods.
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*/
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struct module_func_block* respip_get_funcblock(void);
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/** response-ip init */
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int respip_init(struct module_env* env, int id);
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/** response-ip deinit */
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void respip_deinit(struct module_env* env, int id);
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/** response-ip operate on a query */
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void respip_operate(struct module_qstate* qstate, enum module_ev event, int id,
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struct outbound_entry* outbound);
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/** inform response-ip super */
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void respip_inform_super(struct module_qstate* qstate, int id,
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struct module_qstate* super);
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/** response-ip cleanup query state */
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void respip_clear(struct module_qstate* qstate, int id);
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/**
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* returns address of the IP address tree of the specified respip set;
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* returns NULL for NULL input; exists for test purposes only
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*/
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struct rbtree_type* respip_set_get_tree(struct respip_set* set);
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/**
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* returns respip action for the specified node in the respip address
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* returns respip_none for NULL input; exists for test purposes only
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*/
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enum respip_action resp_addr_get_action(const struct resp_addr* addr);
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/**
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* returns rrset portion of the specified node in the respip address
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* tree; returns NULL for NULL input; exists for test purposes only
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*/
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struct ub_packed_rrset_key* resp_addr_get_rrset(struct resp_addr* addr);
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/** response-ip alloc size routine */
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size_t respip_get_mem(struct module_env* env, int id);
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/**
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* respip set emptiness test
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* @param set respip set to test
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* @return 0 if the specified set exists (non-NULL) and is non-empty;
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* otherwise returns 1
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*/
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int respip_set_is_empty(const struct respip_set* set);
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/**
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* print log information for a query subject to an inform or inform-deny
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* response-ip action.
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* @param respip_addr: response-ip information that causes the action
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* @param qname: query name in the context, will be ignored if local_alias is
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* non-NULL.
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* @param qtype: query type, in host byte order.
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* @param qclass: query class, in host byte order.
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* @param local_alias: set to a local alias if the query matches an alias in
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* a local zone. In this case its owner name will be considered the actual
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* query name.
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* @param repinfo: reply info containing the client's source address and port.
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*/
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void respip_inform_print(struct respip_addr_info* respip_addr, uint8_t* qname,
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uint16_t qtype, uint16_t qclass, struct local_rrset* local_alias,
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struct comm_reply* repinfo);
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#endif /* RESPIP_RESPIP_H */
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