2 * respip/respip.c - filtering response IP module
8 * This file contains a module that inspects a result of recursive resolution
9 * to see if any IP address record should trigger a special action.
10 * If applicable these actions can modify the original response.
14 #include "services/localzone.h"
15 #include "services/cache/dns.h"
16 #include "sldns/str2wire.h"
17 #include "util/config_file.h"
18 #include "util/fptr_wlist.h"
19 #include "util/module.h"
20 #include "util/net_help.h"
21 #include "util/regional.h"
22 #include "util/data/msgreply.h"
23 #include "util/storage/dnstree.h"
24 #include "respip/respip.h"
25 #include "services/view.h"
26 #include "sldns/rrdef.h"
29 * Conceptual set of IP addresses for response AAAA or A records that should
30 * trigger special actions.
33 struct regional* region;
34 struct rbtree_type ip_tree;
35 char* const* tagname; /* shallow copy of tag names, for logging */
36 int num_tags; /* number of tagname entries */
39 /** An address span with response control information */
41 /** node in address tree */
42 struct addr_tree_node node;
45 /** length of the taglist (in bytes) */
47 /** action for this address span */
48 enum respip_action action;
49 /** "local data" for this node */
50 struct ub_packed_rrset_key* data;
53 /** Subset of resp_addr.node, used for inform-variant logging */
54 struct respip_addr_info {
55 struct sockaddr_storage addr;
60 /** Query state regarding the response-ip module. */
63 * The general state. Unless CNAME chasing takes place, all processing
64 * is completed in this state without any other asynchronous event.
69 * A subquery for CNAME chasing is completed.
71 RESPIP_SUBQUERY_FINISHED
74 /** Per query state for the response-ip module. */
75 struct respip_qstate {
76 enum respip_state state;
80 respip_set_create(void)
82 struct respip_set* set = calloc(1, sizeof(*set));
85 set->region = regional_create();
90 addr_tree_init(&set->ip_tree);
95 respip_set_delete(struct respip_set* set)
99 regional_destroy(set->region);
104 respip_set_get_tree(struct respip_set* set)
108 return &set->ip_tree;
111 /** returns the node in the address tree for the specified netblock string;
112 * non-existent node will be created if 'create' is true */
113 static struct resp_addr*
114 respip_find_or_create(struct respip_set* set, const char* ipstr, int create)
116 struct resp_addr* node;
117 struct sockaddr_storage addr;
121 if(!netblockstrtoaddr(ipstr, 0, &addr, &addrlen, &net)) {
122 log_err("cannot parse netblock: '%s'", ipstr);
125 node = (struct resp_addr*)addr_tree_find(&set->ip_tree, &addr, addrlen, net);
126 if(!node && create) {
127 node = regional_alloc_zero(set->region, sizeof(*node));
129 log_err("out of memory");
132 node->action = respip_none;
133 if(!addr_tree_insert(&set->ip_tree, &node->node, &addr,
135 /* We know we didn't find it, so this should be
137 log_warn("unexpected: duplicate address: %s", ipstr);
144 respip_tag_cfg(struct respip_set* set, const char* ipstr,
145 const uint8_t* taglist, size_t taglen)
147 struct resp_addr* node;
149 if(!(node=respip_find_or_create(set, ipstr, 1)))
152 log_warn("duplicate response-address-tag for '%s', overridden.",
155 node->taglist = regional_alloc_init(set->region, taglist, taglen);
157 log_err("out of memory");
160 node->taglen = taglen;
164 /** set action for the node specified by the netblock string */
166 respip_action_cfg(struct respip_set* set, const char* ipstr,
169 struct resp_addr* node;
170 enum respip_action action;
172 if(!(node=respip_find_or_create(set, ipstr, 1)))
174 if(node->action != respip_none) {
175 verbose(VERB_QUERY, "duplicate response-ip action for '%s', overridden.",
178 if(strcmp(actnstr, "deny") == 0)
179 action = respip_deny;
180 else if(strcmp(actnstr, "redirect") == 0)
181 action = respip_redirect;
182 else if(strcmp(actnstr, "inform") == 0)
183 action = respip_inform;
184 else if(strcmp(actnstr, "inform_deny") == 0)
185 action = respip_inform_deny;
186 else if(strcmp(actnstr, "always_transparent") == 0)
187 action = respip_always_transparent;
188 else if(strcmp(actnstr, "always_refuse") == 0)
189 action = respip_always_refuse;
190 else if(strcmp(actnstr, "always_nxdomain") == 0)
191 action = respip_always_nxdomain;
193 log_err("unknown response-ip action %s", actnstr);
196 node->action = action;
200 /** allocate and initialize an rrset structure; this function is based
201 * on new_local_rrset() from the localzone.c module */
202 static struct ub_packed_rrset_key*
203 new_rrset(struct regional* region, uint16_t rrtype, uint16_t rrclass)
205 struct packed_rrset_data* pd;
206 struct ub_packed_rrset_key* rrset = regional_alloc_zero(
207 region, sizeof(*rrset));
209 log_err("out of memory");
212 rrset->entry.key = rrset;
213 pd = regional_alloc_zero(region, sizeof(*pd));
215 log_err("out of memory");
218 pd->trust = rrset_trust_prim_noglue;
219 pd->security = sec_status_insecure;
220 rrset->entry.data = pd;
221 rrset->rk.dname = regional_alloc_zero(region, 1);
222 if(!rrset->rk.dname) {
223 log_err("out of memory");
226 rrset->rk.dname_len = 1;
227 rrset->rk.type = htons(rrtype);
228 rrset->rk.rrset_class = htons(rrclass);
232 /** enter local data as resource records into a response-ip node */
234 respip_enter_rr(struct regional* region, struct resp_addr* raddr,
235 const char* rrstr, const char* netblock)
238 uint16_t rrtype = 0, rrclass = 0;
240 uint8_t rr[LDNS_RR_BUF_SIZE];
241 uint8_t* rdata = NULL;
242 size_t rdata_len = 0;
245 struct packed_rrset_data* pd;
248 if(raddr->action != respip_redirect) {
249 log_err("cannot parse response-ip-data %s: response-ip "
250 "action for %s is not redirect", rrstr, netblock);
253 ret = snprintf(buf, sizeof(buf), ". %s", rrstr);
254 if(ret < 0 || ret >= (int)sizeof(buf)) {
255 strlcpy(bufshort, rrstr, sizeof(bufshort));
256 log_err("bad response-ip-data: %s...", bufshort);
259 if(!rrstr_get_rr_content(buf, &nm, &rrtype, &rrclass, &ttl, rr, sizeof(rr),
260 &rdata, &rdata_len)) {
261 log_err("bad response-ip-data: %s", rrstr);
265 sa = (struct sockaddr*)&raddr->node.addr;
266 if (rrtype == LDNS_RR_TYPE_CNAME && raddr->data) {
267 log_err("CNAME response-ip data (%s) can not co-exist with other "
268 "response-ip data for netblock %s", rrstr, netblock);
270 } else if (raddr->data &&
271 raddr->data->rk.type == htons(LDNS_RR_TYPE_CNAME)) {
272 log_err("response-ip data (%s) can not be added; CNAME response-ip "
273 "data already in place for netblock %s", rrstr, netblock);
275 } else if((rrtype != LDNS_RR_TYPE_CNAME) &&
276 ((sa->sa_family == AF_INET && rrtype != LDNS_RR_TYPE_A) ||
277 (sa->sa_family == AF_INET6 && rrtype != LDNS_RR_TYPE_AAAA))) {
278 log_err("response-ip data %s record type does not correspond "
279 "to netblock %s address family", rrstr, netblock);
284 raddr->data = new_rrset(region, rrtype, rrclass);
288 pd = raddr->data->entry.data;
289 return rrset_insert_rr(region, pd, rdata, rdata_len, ttl, rrstr);
293 respip_data_cfg(struct respip_set* set, const char* ipstr, const char* rrstr)
295 struct resp_addr* node;
297 node=respip_find_or_create(set, ipstr, 0);
298 if(!node || node->action == respip_none) {
299 log_err("cannot parse response-ip-data %s: "
300 "response-ip node for %s not found", rrstr, ipstr);
303 return respip_enter_rr(set->region, node, rrstr, ipstr);
307 respip_set_apply_cfg(struct respip_set* set, char* const* tagname, int num_tags,
308 struct config_strbytelist* respip_tags,
309 struct config_str2list* respip_actions,
310 struct config_str2list* respip_data)
312 struct config_strbytelist* p;
313 struct config_str2list* pa;
314 struct config_str2list* pd;
316 set->tagname = tagname;
317 set->num_tags = num_tags;
321 struct config_strbytelist* np = p->next;
323 log_assert(p->str && p->str2);
324 if(!respip_tag_cfg(set, p->str, p->str2, p->str2len)) {
325 config_del_strbytelist(p);
336 struct config_str2list* np = pa->next;
337 log_assert(pa->str && pa->str2);
338 if(!respip_action_cfg(set, pa->str, pa->str2)) {
339 config_deldblstrlist(pa);
350 struct config_str2list* np = pd->next;
351 log_assert(pd->str && pd->str2);
352 if(!respip_data_cfg(set, pd->str, pd->str2)) {
353 config_deldblstrlist(pd);
366 respip_global_apply_cfg(struct respip_set* set, struct config_file* cfg)
368 int ret = respip_set_apply_cfg(set, cfg->tagname, cfg->num_tags,
369 cfg->respip_tags, cfg->respip_actions, cfg->respip_data);
370 cfg->respip_data = NULL;
371 cfg->respip_actions = NULL;
372 cfg->respip_tags = NULL;
376 /** Iterate through raw view data and apply the view-specific respip
377 * configuration; at this point we should have already seen all the views,
378 * so if any of the views that respip data refer to does not exist, that's
379 * an error. This additional iteration through view configuration data
380 * is expected to not have significant performance impact (or rather, its
381 * performance impact is not expected to be prohibitive in the configuration
385 respip_views_apply_cfg(struct views* vs, struct config_file* cfg,
386 int* have_view_respip_cfg)
388 struct config_view* cv;
392 for(cv = cfg->views; cv; cv = cv->next) {
394 /** if no respip config for this view then there's
395 * nothing to do; note that even though respip data must go
396 * with respip action, we're checking for both here because
397 * we want to catch the case where the respip action is missing
398 * while the data is present */
399 if(!cv->respip_actions && !cv->respip_data)
402 if(!(v = views_find_view(vs, cv->name, 1))) {
403 log_err("view '%s' unexpectedly missing", cv->name);
407 v->respip_set = respip_set_create();
409 log_err("out of memory");
410 lock_rw_unlock(&v->lock);
414 ret = respip_set_apply_cfg(v->respip_set, NULL, 0, NULL,
415 cv->respip_actions, cv->respip_data);
416 lock_rw_unlock(&v->lock);
418 log_err("Error while applying respip configuration "
419 "for view '%s'", cv->name);
422 *have_view_respip_cfg = (*have_view_respip_cfg ||
423 v->respip_set->ip_tree.count);
424 cv->respip_actions = NULL;
425 cv->respip_data = NULL;
431 * make a deep copy of 'key' in 'region'.
432 * This is largely derived from packed_rrset_copy_region() and
433 * packed_rrset_ptr_fixup(), but differs in the following points:
435 * - It doesn't assume all data in 'key' are in a contiguous memory region.
436 * Although that would be the case in most cases, 'key' can be passed from
437 * a lower-level module and it might not build the rrset to meet the
438 * assumption. In fact, an rrset specified as response-ip-data or generated
439 * in local_data_find_tag_datas() breaks the assumption. So it would be
440 * safer not to naively rely on the assumption. On the other hand, this
441 * function ensures the copied rrset data are in a contiguous region so
442 * that it won't cause a disruption even if an upper layer module naively
443 * assumes the memory layout.
444 * - It doesn't copy RRSIGs (if any) in 'key'. The rrset will be used in
445 * a reply that was already faked, so it doesn't make much sense to provide
446 * partial sigs even if they are valid themselves.
447 * - It doesn't adjust TTLs as it basically has to be a verbatim copy of 'key'
448 * just allocated in 'region' (the assumption is necessary TTL adjustment
449 * has been already done in 'key').
451 * This function returns the copied rrset key on success, and NULL on memory
452 * allocation failure.
454 static struct ub_packed_rrset_key*
455 copy_rrset(const struct ub_packed_rrset_key* key, struct regional* region)
457 struct ub_packed_rrset_key* ck = regional_alloc(region,
458 sizeof(struct ub_packed_rrset_key));
459 struct packed_rrset_data* d;
460 struct packed_rrset_data* data = key->entry.data;
464 /* derived from packed_rrset_copy_region(), but don't use
465 * packed_rrset_sizeof() and do exclude RRSIGs */
469 memset(&ck->entry, 0, sizeof(ck->entry));
470 ck->entry.hash = key->entry.hash;
473 ck->rk.dname = regional_alloc_init(region, key->rk.dname,
478 dsize = sizeof(struct packed_rrset_data) + data->count *
479 (sizeof(size_t)+sizeof(uint8_t*)+sizeof(time_t));
480 for(i=0; i<data->count; i++)
481 dsize += data->rr_len[i];
482 d = regional_alloc(region, dsize);
489 /* derived from packed_rrset_ptr_fixup() with copying the data */
490 d->rr_len = (size_t*)((uint8_t*)d + sizeof(struct packed_rrset_data));
491 d->rr_data = (uint8_t**)&(d->rr_len[d->count]);
492 d->rr_ttl = (time_t*)&(d->rr_data[d->count]);
493 nextrdata = (uint8_t*)&(d->rr_ttl[d->count]);
494 for(i=0; i<d->count; i++) {
495 d->rr_len[i] = data->rr_len[i];
496 d->rr_ttl[i] = data->rr_ttl[i];
497 d->rr_data[i] = nextrdata;
498 memcpy(d->rr_data[i], data->rr_data[i], data->rr_len[i]);
499 nextrdata += d->rr_len[i];
506 respip_init(struct module_env* env, int id)
514 respip_deinit(struct module_env* env, int id)
520 /** Convert a packed AAAA or A RRset to sockaddr. */
522 rdata2sockaddr(const struct packed_rrset_data* rd, uint16_t rtype, size_t i,
523 struct sockaddr_storage* ss, socklen_t* addrlenp)
525 /* unbound can accept and cache odd-length AAAA/A records, so we have
526 * to validate the length. */
527 if(rtype == LDNS_RR_TYPE_A && rd->rr_len[i] == 6) {
528 struct sockaddr_in* sa4 = (struct sockaddr_in*)ss;
530 memset(sa4, 0, sizeof(*sa4));
531 sa4->sin_family = AF_INET;
532 memcpy(&sa4->sin_addr, rd->rr_data[i] + 2,
533 sizeof(sa4->sin_addr));
534 *addrlenp = sizeof(*sa4);
536 } else if(rtype == LDNS_RR_TYPE_AAAA && rd->rr_len[i] == 18) {
537 struct sockaddr_in6* sa6 = (struct sockaddr_in6*)ss;
539 memset(sa6, 0, sizeof(*sa6));
540 sa6->sin6_family = AF_INET6;
541 memcpy(&sa6->sin6_addr, rd->rr_data[i] + 2,
542 sizeof(sa6->sin6_addr));
543 *addrlenp = sizeof(*sa6);
550 * Search the given 'iptree' for response address information that matches
551 * any of the IP addresses in an AAAA or A in the answer section of the
552 * response (stored in 'rep'). If found, a pointer to the matched resp_addr
553 * structure will be returned, and '*rrset_id' is set to the index in
554 * rep->rrsets for the RRset that contains the matching IP address record
555 * (the index is normally 0, but can be larger than that if this is a CNAME
556 * chain or type-ANY response).
558 static const struct resp_addr*
559 respip_addr_lookup(const struct reply_info *rep, struct rbtree_type* iptree,
563 struct resp_addr* ra;
564 struct sockaddr_storage ss;
567 for(i=0; i<rep->an_numrrsets; i++) {
569 const struct packed_rrset_data* rd;
570 uint16_t rtype = ntohs(rep->rrsets[i]->rk.type);
572 if(rtype != LDNS_RR_TYPE_A && rtype != LDNS_RR_TYPE_AAAA)
574 rd = rep->rrsets[i]->entry.data;
575 for(j = 0; j < rd->count; j++) {
576 if(!rdata2sockaddr(rd, rtype, j, &ss, &addrlen))
578 ra = (struct resp_addr*)addr_tree_lookup(iptree, &ss,
591 * Create a new reply_info based on 'rep'. The new info is based on
592 * the passed 'rep', but ignores any rrsets except for the first 'an_numrrsets'
593 * RRsets in the answer section. These answer rrsets are copied to the
594 * new info, up to 'copy_rrsets' rrsets (which must not be larger than
595 * 'an_numrrsets'). If an_numrrsets > copy_rrsets, the remaining rrsets array
596 * entries will be kept empty so the caller can fill them later. When rrsets
597 * are copied, they are shallow copied. The caller must ensure that the
598 * copied rrsets are valid throughout its lifetime and must provide appropriate
599 * mutex if it can be shared by multiple threads.
601 static struct reply_info *
602 make_new_reply_info(const struct reply_info* rep, struct regional* region,
603 size_t an_numrrsets, size_t copy_rrsets)
605 struct reply_info* new_rep;
608 /* create a base struct. we specify 'insecure' security status as
609 * the modified response won't be DNSSEC-valid. In our faked response
610 * the authority and additional sections will be empty (except possible
611 * EDNS0 OPT RR in the additional section appended on sending it out),
612 * so the total number of RRsets is an_numrrsets. */
613 new_rep = construct_reply_info_base(region, rep->flags,
614 rep->qdcount, rep->ttl, rep->prefetch_ttl,
615 rep->serve_expired_ttl, an_numrrsets, 0, 0, an_numrrsets,
616 sec_status_insecure);
619 if(!reply_info_alloc_rrset_keys(new_rep, NULL, region))
621 for(i=0; i<copy_rrsets; i++)
622 new_rep->rrsets[i] = rep->rrsets[i];
628 * See if response-ip or tag data should override the original answer rrset
629 * (which is rep->rrsets[rrset_id]) and if so override it.
630 * This is (mostly) equivalent to localzone.c:local_data_answer() but for
631 * response-ip actions.
632 * Note that this function distinguishes error conditions from "success but
633 * not overridden". This is because we want to avoid accidentally applying
634 * the "no data" action in case of error.
635 * @param raddr: address span that requires an action
636 * @param action: action to apply
637 * @param qtype: original query type
638 * @param rep: original reply message
639 * @param rrset_id: the rrset ID in 'rep' to which the action should apply
640 * @param new_repp: see respip_rewrite_reply
641 * @param tag: if >= 0 the tag ID used to determine the action and data
642 * @param tag_datas: data corresponding to 'tag'.
643 * @param tag_datas_size: size of 'tag_datas'
644 * @param tagname: array of tag names, used for logging
645 * @param num_tags: size of 'tagname', used for logging
646 * @param redirect_rrsetp: ptr to redirect record
647 * @param region: region for building new reply
648 * @return 1 if overridden, 0 if not overridden, -1 on error.
651 respip_data_answer(const struct resp_addr* raddr, enum respip_action action,
652 uint16_t qtype, const struct reply_info* rep,
653 size_t rrset_id, struct reply_info** new_repp, int tag,
654 struct config_strlist** tag_datas, size_t tag_datas_size,
655 char* const* tagname, int num_tags,
656 struct ub_packed_rrset_key** redirect_rrsetp, struct regional* region)
658 struct ub_packed_rrset_key* rp = raddr->data;
659 struct reply_info* new_rep;
660 *redirect_rrsetp = NULL;
662 if(action == respip_redirect && tag != -1 &&
663 (size_t)tag<tag_datas_size && tag_datas[tag]) {
664 struct query_info dataqinfo;
665 struct ub_packed_rrset_key r;
667 /* Extract parameters of the original answer rrset that can be
668 * rewritten below, in the form of query_info. Note that these
669 * can be different from the info of the original query if the
670 * rrset is a CNAME target.*/
671 memset(&dataqinfo, 0, sizeof(dataqinfo));
672 dataqinfo.qname = rep->rrsets[rrset_id]->rk.dname;
673 dataqinfo.qname_len = rep->rrsets[rrset_id]->rk.dname_len;
674 dataqinfo.qtype = ntohs(rep->rrsets[rrset_id]->rk.type);
675 dataqinfo.qclass = ntohs(rep->rrsets[rrset_id]->rk.rrset_class);
677 memset(&r, 0, sizeof(r));
678 if(local_data_find_tag_datas(&dataqinfo, tag_datas[tag], &r,
681 "response-ip redirect with tag data [%d] %s",
682 tag, (tag<num_tags?tagname[tag]:"null"));
683 /* use copy_rrset() to 'normalize' memory layout */
684 rp = copy_rrset(&r, region);
692 /* If we are using response-ip-data, we need to make a copy of rrset
693 * to replace the rrset's dname. Note that, unlike local data, we
694 * rename the dname for other actions than redirect. This is because
695 * response-ip-data isn't associated to any specific name. */
696 if(rp == raddr->data) {
697 rp = copy_rrset(rp, region);
700 rp->rk.dname = rep->rrsets[rrset_id]->rk.dname;
701 rp->rk.dname_len = rep->rrsets[rrset_id]->rk.dname_len;
704 /* Build a new reply with redirect rrset. We keep any preceding CNAMEs
705 * and replace the address rrset that triggers the action. If it's
706 * type ANY query, however, no other answer records should be kept
707 * (note that it can't be a CNAME chain in this case due to
709 if(qtype == LDNS_RR_TYPE_ANY)
711 new_rep = make_new_reply_info(rep, region, rrset_id + 1, rrset_id);
714 rp->rk.flags |= PACKED_RRSET_FIXEDTTL; /* avoid adjusting TTL */
715 new_rep->rrsets[rrset_id] = rp;
717 *redirect_rrsetp = rp;
723 * apply response ip action in case where no action data is provided.
724 * this is similar to localzone.c:lz_zone_answer() but simplified due to
725 * the characteristics of response ip:
726 * - 'deny' variants will be handled at the caller side
727 * - no specific processing for 'transparent' variants: unlike local zones,
728 * there is no such a case of 'no data but name existing'. so all variants
729 * just mean 'transparent if no data'.
730 * @param qtype: query type
731 * @param action: found action
735 * @param region: region for building new reply
736 * @return 1 on success, 0 on error.
739 respip_nodata_answer(uint16_t qtype, enum respip_action action,
740 const struct reply_info *rep, size_t rrset_id,
741 struct reply_info** new_repp, struct regional* region)
743 struct reply_info* new_rep;
745 if(action == respip_refuse || action == respip_always_refuse) {
746 new_rep = make_new_reply_info(rep, region, 0, 0);
749 FLAGS_SET_RCODE(new_rep->flags, LDNS_RCODE_REFUSED);
752 } else if(action == respip_static || action == respip_redirect ||
753 action == respip_always_nxdomain) {
754 /* Since we don't know about other types of the owner name,
755 * we generally return NOERROR/NODATA unless an NXDOMAIN action
756 * is explicitly specified. */
757 int rcode = (action == respip_always_nxdomain)?
758 LDNS_RCODE_NXDOMAIN:LDNS_RCODE_NOERROR;
760 /* We should empty the answer section except for any preceding
761 * CNAMEs (in that case rrset_id > 0). Type-ANY case is
762 * special as noted in respip_data_answer(). */
763 if(qtype == LDNS_RR_TYPE_ANY)
765 new_rep = make_new_reply_info(rep, region, rrset_id, rrset_id);
768 FLAGS_SET_RCODE(new_rep->flags, rcode);
776 /** Populate action info structure with the results of response-ip action
777 * processing, iff as the result of response-ip processing we are actually
778 * taking some action. Only action is set if action_only is true.
779 * Returns true on success, false on failure.
782 populate_action_info(struct respip_action_info* actinfo,
783 enum respip_action action, const struct resp_addr* raddr,
784 const struct ub_packed_rrset_key* ATTR_UNUSED(rrset),
785 int ATTR_UNUSED(tag), const struct respip_set* ATTR_UNUSED(ipset),
786 int ATTR_UNUSED(action_only), struct regional* region)
788 if(action == respip_none || !raddr)
790 actinfo->action = action;
792 /* for inform variants, make a copy of the matched address block for
793 * later logging. We make a copy to proactively avoid disruption if
794 * and when we allow a dynamic update to the respip tree. */
795 if(action == respip_inform || action == respip_inform_deny) {
796 struct respip_addr_info* a =
797 regional_alloc_zero(region, sizeof(*a));
799 log_err("out of memory");
802 a->addr = raddr->node.addr;
803 a->addrlen = raddr->node.addrlen;
804 a->net = raddr->node.net;
805 actinfo->addrinfo = a;
812 respip_rewrite_reply(const struct query_info* qinfo,
813 const struct respip_client_info* cinfo, const struct reply_info* rep,
814 struct reply_info** new_repp, struct respip_action_info* actinfo,
815 struct ub_packed_rrset_key** alias_rrset, int search_only,
816 struct regional* region)
818 const uint8_t* ctaglist;
820 const uint8_t* tag_actions;
821 size_t tag_actions_size;
822 struct config_strlist** tag_datas;
823 size_t tag_datas_size;
824 struct view* view = NULL;
825 struct respip_set* ipset = NULL;
827 enum respip_action action = respip_none;
829 const struct resp_addr* raddr = NULL;
831 struct ub_packed_rrset_key* redirect_rrset = NULL;
835 ctaglist = cinfo->taglist;
836 ctaglen = cinfo->taglen;
837 tag_actions = cinfo->tag_actions;
838 tag_actions_size = cinfo->tag_actions_size;
839 tag_datas = cinfo->tag_datas;
840 tag_datas_size = cinfo->tag_datas_size;
842 ipset = cinfo->respip_set;
844 /** Try to use response-ip config from the view first; use
845 * global response-ip config if we don't have the view or we don't
846 * have the matching per-view config (and the view allows the use
847 * of global data in this case).
848 * Note that we lock the view even if we only use view members that
849 * currently don't change after creation. This is for safety for
850 * future possible changes as the view documentation seems to expect
851 * any of its member can change in the view's lifetime.
852 * Note also that we assume 'view' is valid in this function, which
853 * should be safe (see unbound bug #1191) */
855 lock_rw_rdlock(&view->lock);
856 if(view->respip_set) {
857 if((raddr = respip_addr_lookup(rep,
858 &view->respip_set->ip_tree, &rrset_id))) {
859 /** for per-view respip directives the action
860 * can only be direct (i.e. not tag-based) */
861 action = raddr->action;
864 if(!raddr && !view->isfirst)
867 if(!raddr && ipset && (raddr = respip_addr_lookup(rep, &ipset->ip_tree,
869 action = (enum respip_action)local_data_find_tag_action(
870 raddr->taglist, raddr->taglen, ctaglist, ctaglen,
871 tag_actions, tag_actions_size,
872 (enum localzone_type)raddr->action, &tag,
873 ipset->tagname, ipset->num_tags);
875 if(raddr && !search_only) {
878 /* first, see if we have response-ip or tag action for the
879 * action except for 'always' variants. */
880 if(action != respip_always_refuse
881 && action != respip_always_transparent
882 && action != respip_always_nxdomain
883 && (result = respip_data_answer(raddr, action,
884 qinfo->qtype, rep, rrset_id, new_repp, tag, tag_datas,
885 tag_datas_size, ipset->tagname, ipset->num_tags,
886 &redirect_rrset, region)) < 0) {
891 /* if no action data applied, take action specific to the
892 * action without data. */
893 if(!result && !respip_nodata_answer(qinfo->qtype, action, rep,
894 rrset_id, new_repp, region)) {
901 lock_rw_unlock(&view->lock);
904 /* If we're redirecting the original answer to a
905 * CNAME, record the CNAME rrset so the caller can take
906 * the appropriate action. Note that we don't check the
907 * action type; it should normally be 'redirect', but it
908 * can be of other type when a data-dependent tag action
909 * uses redirect response-ip data.
912 redirect_rrset->rk.type == ntohs(LDNS_RR_TYPE_CNAME) &&
913 qinfo->qtype != LDNS_RR_TYPE_ANY)
914 *alias_rrset = redirect_rrset;
915 /* on success, populate respip result structure */
916 ret = populate_action_info(actinfo, action, raddr,
917 redirect_rrset, tag, ipset, search_only, region);
923 generate_cname_request(struct module_qstate* qstate,
924 struct ub_packed_rrset_key* alias_rrset)
926 struct module_qstate* subq = NULL;
927 struct query_info subqi;
929 memset(&subqi, 0, sizeof(subqi));
930 get_cname_target(alias_rrset, &subqi.qname, &subqi.qname_len);
932 return 0; /* unexpected: not a valid CNAME RDATA */
933 subqi.qtype = qstate->qinfo.qtype;
934 subqi.qclass = qstate->qinfo.qclass;
935 fptr_ok(fptr_whitelist_modenv_attach_sub(qstate->env->attach_sub));
936 return (*qstate->env->attach_sub)(qstate, &subqi, BIT_RD, 0, 0, &subq);
940 respip_operate(struct module_qstate* qstate, enum module_ev event, int id,
941 struct outbound_entry* outbound)
943 struct respip_qstate* rq = (struct respip_qstate*)qstate->minfo[id];
945 log_query_info(VERB_QUERY, "respip operate: query", &qstate->qinfo);
948 if(event == module_event_new || event == module_event_pass) {
950 rq = regional_alloc_zero(qstate->region, sizeof(*rq));
953 rq->state = RESPIP_INIT;
954 qstate->minfo[id] = rq;
956 if(rq->state == RESPIP_SUBQUERY_FINISHED) {
957 qstate->ext_state[id] = module_finished;
960 verbose(VERB_ALGO, "respip: pass to next module");
961 qstate->ext_state[id] = module_wait_module;
962 } else if(event == module_event_moddone) {
963 /* If the reply may be subject to response-ip rewriting
964 * according to the query type, check the actions. If a
965 * rewrite is necessary, we'll replace the reply in qstate
966 * with the new one. */
967 enum module_ext_state next_state = module_finished;
969 if((qstate->qinfo.qtype == LDNS_RR_TYPE_A ||
970 qstate->qinfo.qtype == LDNS_RR_TYPE_AAAA ||
971 qstate->qinfo.qtype == LDNS_RR_TYPE_ANY) &&
972 qstate->return_msg && qstate->return_msg->rep) {
973 struct respip_action_info actinfo = {respip_none, NULL};
974 struct reply_info* new_rep = qstate->return_msg->rep;
975 struct ub_packed_rrset_key* alias_rrset = NULL;
977 if(!respip_rewrite_reply(&qstate->qinfo,
978 qstate->client_info, qstate->return_msg->rep,
979 &new_rep, &actinfo, &alias_rrset, 0,
983 if(actinfo.action != respip_none) {
984 /* save action info for logging on a
985 * per-front-end-query basis */
986 if(!(qstate->respip_action_info =
987 regional_alloc_init(qstate->region,
988 &actinfo, sizeof(actinfo))))
990 log_err("out of memory");
994 qstate->respip_action_info = NULL;
996 if (new_rep == qstate->return_msg->rep &&
997 (actinfo.action == respip_deny ||
998 actinfo.action == respip_inform_deny)) {
999 /* for deny-variant actions (unless response-ip
1000 * data is applied), mark the query state so
1001 * the response will be dropped for all
1003 qstate->is_drop = 1;
1004 } else if(alias_rrset) {
1005 if(!generate_cname_request(qstate, alias_rrset))
1007 next_state = module_wait_subquery;
1009 qstate->return_msg->rep = new_rep;
1011 qstate->ext_state[id] = next_state;
1013 qstate->ext_state[id] = module_finished;
1018 qstate->return_rcode = LDNS_RCODE_SERVFAIL;
1019 qstate->return_msg = NULL;
1023 respip_merge_cname(struct reply_info* base_rep,
1024 const struct query_info* qinfo, const struct reply_info* tgt_rep,
1025 const struct respip_client_info* cinfo, int must_validate,
1026 struct reply_info** new_repp, struct regional* region)
1028 struct reply_info* new_rep;
1029 struct reply_info* tmp_rep = NULL; /* just a placeholder */
1030 struct ub_packed_rrset_key* alias_rrset = NULL; /* ditto */
1033 struct respip_action_info actinfo = {respip_none, NULL};
1035 /* If the query for the CNAME target would result in an unusual rcode,
1036 * we generally translate it as a failure for the base query
1037 * (which would then be translated into SERVFAIL). The only exception
1038 * is NXDOMAIN and YXDOMAIN, which are passed to the end client(s).
1039 * The YXDOMAIN case would be rare but still possible (when
1040 * DNSSEC-validated DNAME has been cached but synthesizing CNAME
1041 * can't be generated due to length limitation) */
1042 tgt_rcode = FLAGS_GET_RCODE(tgt_rep->flags);
1043 if((tgt_rcode != LDNS_RCODE_NOERROR &&
1044 tgt_rcode != LDNS_RCODE_NXDOMAIN &&
1045 tgt_rcode != LDNS_RCODE_YXDOMAIN) ||
1046 (must_validate && tgt_rep->security <= sec_status_bogus)) {
1050 /* see if the target reply would be subject to a response-ip action. */
1051 if(!respip_rewrite_reply(qinfo, cinfo, tgt_rep, &tmp_rep, &actinfo,
1052 &alias_rrset, 1, region))
1054 if(actinfo.action != respip_none) {
1055 log_info("CNAME target of redirect response-ip action would "
1056 "be subject to response-ip action, too; stripped");
1057 *new_repp = base_rep;
1061 /* Append target reply to the base. Since we cannot assume
1062 * tgt_rep->rrsets is valid throughout the lifetime of new_rep
1063 * or it can be safely shared by multiple threads, we need to make a
1065 new_rep = make_new_reply_info(base_rep, region,
1066 base_rep->an_numrrsets + tgt_rep->an_numrrsets,
1067 base_rep->an_numrrsets);
1070 for(i=0,j=base_rep->an_numrrsets; i<tgt_rep->an_numrrsets; i++,j++) {
1071 new_rep->rrsets[j] = copy_rrset(tgt_rep->rrsets[i], region);
1072 if(!new_rep->rrsets[j])
1076 FLAGS_SET_RCODE(new_rep->flags, tgt_rcode);
1077 *new_repp = new_rep;
1082 respip_inform_super(struct module_qstate* qstate, int id,
1083 struct module_qstate* super)
1085 struct respip_qstate* rq = (struct respip_qstate*)super->minfo[id];
1086 struct reply_info* new_rep = NULL;
1088 rq->state = RESPIP_SUBQUERY_FINISHED;
1090 /* respip subquery should have always been created with a valid reply
1092 log_assert(super->return_msg && super->return_msg->rep);
1094 /* return_msg can be NULL when, e.g., the sub query resulted in
1095 * SERVFAIL, in which case we regard it as a failure of the original
1096 * query. Other checks are probably redundant, but we check them
1098 if(!qstate->return_msg || !qstate->return_msg->rep ||
1099 qstate->return_rcode != LDNS_RCODE_NOERROR)
1102 if(!respip_merge_cname(super->return_msg->rep, &qstate->qinfo,
1103 qstate->return_msg->rep, super->client_info,
1104 super->env->need_to_validate, &new_rep, super->region))
1106 super->return_msg->rep = new_rep;
1110 super->return_rcode = LDNS_RCODE_SERVFAIL;
1111 super->return_msg = NULL;
1116 respip_clear(struct module_qstate* qstate, int id)
1118 qstate->minfo[id] = NULL;
1122 respip_get_mem(struct module_env* env, int id)
1130 * The response-ip function block
1132 static struct module_func_block respip_block = {
1134 &respip_init, &respip_deinit, &respip_operate, &respip_inform_super,
1135 &respip_clear, &respip_get_mem
1138 struct module_func_block*
1139 respip_get_funcblock(void)
1141 return &respip_block;
1145 resp_addr_get_action(const struct resp_addr* addr)
1147 return addr ? addr->action : respip_none;
1150 struct ub_packed_rrset_key*
1151 resp_addr_get_rrset(struct resp_addr* addr)
1153 return addr ? addr->data : NULL;
1157 respip_set_is_empty(const struct respip_set* set)
1159 return set ? set->ip_tree.count == 0 : 1;
1163 respip_inform_print(struct respip_addr_info* respip_addr, uint8_t* qname,
1164 uint16_t qtype, uint16_t qclass, struct local_rrset* local_alias,
1165 struct comm_reply* repinfo)
1167 char srcip[128], respip[128], txt[512];
1171 qname = local_alias->rrset->rk.dname;
1172 port = (unsigned)((repinfo->addr.ss_family == AF_INET) ?
1173 ntohs(((struct sockaddr_in*)&repinfo->addr)->sin_port) :
1174 ntohs(((struct sockaddr_in6*)&repinfo->addr)->sin6_port));
1175 addr_to_str(&repinfo->addr, repinfo->addrlen, srcip, sizeof(srcip));
1176 addr_to_str(&respip_addr->addr, respip_addr->addrlen,
1177 respip, sizeof(respip));
1178 snprintf(txt, sizeof(txt), "%s/%d inform %s@%u", respip,
1179 respip_addr->net, srcip, port);
1180 log_nametypeclass(0, txt, qname, qtype, qclass);