/src/unbound/services/rpz.c

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/*
 * services/rpz.c - rpz service
 *
 * Copyright (c) 2019, NLnet Labs. All rights reserved.
 *
 * This software is open source.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * Neither the name of the NLNET LABS nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * \file
 *
 * This file contains functions to enable RPZ service.
 */

#include "config.h"
#include "services/rpz.h"
#include "util/config_file.h"
#include "sldns/wire2str.h"
#include "sldns/str2wire.h"
#include "util/data/dname.h"
#include "util/net_help.h"
#include "util/log.h"
#include "util/data/dname.h"
#include "util/locks.h"
#include "util/regional.h"
#include "util/data/msgencode.h"
#include "services/cache/dns.h"
#include "iterator/iterator.h"
#include "iterator/iter_delegpt.h"
#include "daemon/worker.h"

typedef struct resp_addr rpz_aclnode_type;

struct matched_delegation_point {
  uint8_t* dname;
  size_t dname_len;
};

/** string for RPZ action enum */
const char*
rpz_action_to_string(enum rpz_action a)
{
  switch(a) {
  case RPZ_NXDOMAIN_ACTION: return "rpz-nxdomain";
  case RPZ_NODATA_ACTION: return "rpz-nodata";
  case RPZ_PASSTHRU_ACTION: return "rpz-passthru";
  case RPZ_DROP_ACTION: return "rpz-drop";
  case RPZ_TCP_ONLY_ACTION: return "rpz-tcp-only";
  case RPZ_INVALID_ACTION: return "rpz-invalid";
  case RPZ_LOCAL_DATA_ACTION: return "rpz-local-data";
  case RPZ_DISABLED_ACTION: return "rpz-disabled";
  case RPZ_CNAME_OVERRIDE_ACTION: return "rpz-cname-override";
  case RPZ_NO_OVERRIDE_ACTION: return "rpz-no-override";
  default: return "rpz-unknown-action";
  }
}

/** RPZ action enum for config string */
static enum rpz_action
rpz_config_to_action(char* a)
{
  if(strcmp(a, "nxdomain") == 0) return RPZ_NXDOMAIN_ACTION;
  else if(strcmp(a, "nodata") == 0) return RPZ_NODATA_ACTION;
  else if(strcmp(a, "passthru") == 0) return RPZ_PASSTHRU_ACTION;
  else if(strcmp(a, "drop") == 0) return RPZ_DROP_ACTION;
  else if(strcmp(a, "tcp_only") == 0) return RPZ_TCP_ONLY_ACTION;
  else if(strcmp(a, "cname") == 0) return RPZ_CNAME_OVERRIDE_ACTION;
  else if(strcmp(a, "disabled") == 0) return RPZ_DISABLED_ACTION;
  else return RPZ_INVALID_ACTION;
}

/** string for RPZ trigger enum */
static const char*
rpz_trigger_to_string(enum rpz_trigger r)
{
  switch(r) {
  case RPZ_QNAME_TRIGGER: return "rpz-qname";
  case RPZ_CLIENT_IP_TRIGGER: return "rpz-client-ip";
  case RPZ_RESPONSE_IP_TRIGGER: return "rpz-response-ip";
  case RPZ_NSDNAME_TRIGGER: return "rpz-nsdname";
  case RPZ_NSIP_TRIGGER: return "rpz-nsip";
  case RPZ_INVALID_TRIGGER: return "rpz-invalid";
  default: return "rpz-unknown-trigger";
  }
}

/**
 * Get the label that is just before the root label.
 * @param dname: dname to work on
 * @param maxdnamelen: maximum length of the dname
 * @return: pointer to TLD label, NULL if not found or invalid dname
 */
static uint8_t*
get_tld_label(uint8_t* dname, size_t maxdnamelen)
{
  uint8_t* prevlab = dname;
  size_t dnamelen = 0;

  /* one byte needed for label length */
  if(dnamelen+1 > maxdnamelen)
    return NULL;

  /* only root label */
  if(*dname == 0)
    return NULL;

  while(*dname) {
    dnamelen += ((size_t)*dname)+1;
    if(dnamelen+1 > maxdnamelen)
      return NULL;
    dname = dname+((size_t)*dname)+1;
    if(*dname != 0)
      prevlab = dname;
  }
  return prevlab;
}

/**
 * The RR types that are to be ignored.
 * DNSSEC RRs at the apex, and SOA and NS are ignored.
 */
static int
rpz_type_ignored(uint16_t rr_type)
{
  switch(rr_type) {
    case LDNS_RR_TYPE_SOA:
    case LDNS_RR_TYPE_NS:
    case LDNS_RR_TYPE_DNAME:
    /* all DNSSEC-related RRs must be ignored */
    case LDNS_RR_TYPE_DNSKEY:
    case LDNS_RR_TYPE_DS:
    case LDNS_RR_TYPE_RRSIG:
    case LDNS_RR_TYPE_NSEC:
    case LDNS_RR_TYPE_NSEC3:
    case LDNS_RR_TYPE_NSEC3PARAM:
      return 1;
    default:
      break;
  }
  return 0;
}

/**
 * Classify RPZ action for RR type/rdata
 * @param rr_type: the RR type
 * @param rdatawl: RDATA with 2 bytes length
 * @param rdatalen: the length of rdatawl (including its 2 bytes length)
 * @return: the RPZ action
 */
static enum rpz_action
rpz_rr_to_action(uint16_t rr_type, uint8_t* rdatawl, size_t rdatalen)
{
  char* endptr;
  uint8_t* rdata;
  int rdatalabs;
  uint8_t* tldlab = NULL;

  switch(rr_type) {
    case LDNS_RR_TYPE_SOA:
    case LDNS_RR_TYPE_NS:
    case LDNS_RR_TYPE_DNAME:
    /* all DNSSEC-related RRs must be ignored */
    case LDNS_RR_TYPE_DNSKEY:
    case LDNS_RR_TYPE_DS:
    case LDNS_RR_TYPE_RRSIG:
    case LDNS_RR_TYPE_NSEC:
    case LDNS_RR_TYPE_NSEC3:
    case LDNS_RR_TYPE_NSEC3PARAM:
      return RPZ_INVALID_ACTION;
    case LDNS_RR_TYPE_CNAME:
      break;
    default:
      return RPZ_LOCAL_DATA_ACTION;
  }

  /* use CNAME target to determine RPZ action */
  log_assert(rr_type == LDNS_RR_TYPE_CNAME);
  if(rdatalen < 3)
    return RPZ_INVALID_ACTION;

  rdata = rdatawl + 2; /* 2 bytes of rdata length */
  if(dname_valid(rdata, rdatalen-2) != rdatalen-2)
    return RPZ_INVALID_ACTION;

  rdatalabs = dname_count_labels(rdata);
  if(rdatalabs == 1)
    return RPZ_NXDOMAIN_ACTION;
  else if(rdatalabs == 2) {
    if(dname_subdomain_c(rdata, (uint8_t*)&"\001*\000"))
      return RPZ_NODATA_ACTION;
    else if(dname_subdomain_c(rdata,
      (uint8_t*)&"\014rpz-passthru\000"))
      return RPZ_PASSTHRU_ACTION;
    else if(dname_subdomain_c(rdata, (uint8_t*)&"\010rpz-drop\000"))
      return RPZ_DROP_ACTION;
    else if(dname_subdomain_c(rdata,
      (uint8_t*)&"\014rpz-tcp-only\000"))
      return RPZ_TCP_ONLY_ACTION;
  }

  /* all other TLDs starting with "rpz-" are invalid */
  tldlab = get_tld_label(rdata, rdatalen-2);
  if(tldlab && dname_lab_startswith(tldlab, "rpz-", &endptr))
    return RPZ_INVALID_ACTION;

  /* no special label found */
  return RPZ_LOCAL_DATA_ACTION;
}

static enum localzone_type 
rpz_action_to_localzone_type(enum rpz_action a)
{
  switch(a) {
  case RPZ_NXDOMAIN_ACTION: return local_zone_always_nxdomain;
  case RPZ_NODATA_ACTION: return local_zone_always_nodata;
  case RPZ_DROP_ACTION: return local_zone_always_deny;
  case RPZ_PASSTHRU_ACTION: return local_zone_always_transparent;
  case RPZ_LOCAL_DATA_ACTION:
    ATTR_FALLTHROUGH
    /* fallthrough */
  case RPZ_CNAME_OVERRIDE_ACTION: return local_zone_redirect;
  case RPZ_TCP_ONLY_ACTION: return local_zone_truncate;
  case RPZ_INVALID_ACTION:
    ATTR_FALLTHROUGH
    /* fallthrough */
  default: return local_zone_invalid;
  }
}

enum respip_action
rpz_action_to_respip_action(enum rpz_action a)
{
  switch(a) {
  case RPZ_NXDOMAIN_ACTION: return respip_always_nxdomain;
  case RPZ_NODATA_ACTION: return respip_always_nodata;
  case RPZ_DROP_ACTION: return respip_always_deny;
  case RPZ_PASSTHRU_ACTION: return respip_always_transparent;
  case RPZ_LOCAL_DATA_ACTION:
    ATTR_FALLTHROUGH
    /* fallthrough */
  case RPZ_CNAME_OVERRIDE_ACTION: return respip_redirect;
  case RPZ_TCP_ONLY_ACTION: return respip_truncate;
  case RPZ_INVALID_ACTION:
    ATTR_FALLTHROUGH
    /* fallthrough */
  default: return respip_invalid;
  }
}

static enum rpz_action
localzone_type_to_rpz_action(enum localzone_type lzt)
{
  switch(lzt) {
  case local_zone_always_nxdomain: return RPZ_NXDOMAIN_ACTION;
  case local_zone_always_nodata: return RPZ_NODATA_ACTION;
  case local_zone_always_deny: return RPZ_DROP_ACTION;
  case local_zone_always_transparent: return RPZ_PASSTHRU_ACTION;
  case local_zone_redirect: return RPZ_LOCAL_DATA_ACTION;
  case local_zone_truncate: return RPZ_TCP_ONLY_ACTION;
  case local_zone_invalid:
    ATTR_FALLTHROUGH
    /* fallthrough */
  default: return RPZ_INVALID_ACTION;
  }
}

enum rpz_action
respip_action_to_rpz_action(enum respip_action a)
{
  switch(a) {
  case respip_always_nxdomain: return RPZ_NXDOMAIN_ACTION;
  case respip_always_nodata: return RPZ_NODATA_ACTION;
  case respip_always_deny: return RPZ_DROP_ACTION;
  case respip_always_transparent: return RPZ_PASSTHRU_ACTION;
  case respip_redirect: return RPZ_LOCAL_DATA_ACTION;
  case respip_truncate: return RPZ_TCP_ONLY_ACTION;
  case respip_invalid:
    ATTR_FALLTHROUGH
    /* fallthrough */
  default: return RPZ_INVALID_ACTION;
  }
}

/**
 * Get RPZ trigger for dname
 * @param dname: dname containing RPZ trigger
 * @param dname_len: length of the dname
 * @return: RPZ trigger enum
 */
static enum rpz_trigger
rpz_dname_to_trigger(uint8_t* dname, size_t dname_len)
{
  uint8_t* tldlab;
  char* endptr;

  if(dname_valid(dname, dname_len) != dname_len)
    return RPZ_INVALID_TRIGGER;

  tldlab = get_tld_label(dname, dname_len);
  if(!tldlab || !dname_lab_startswith(tldlab, "rpz-", &endptr))
    return RPZ_QNAME_TRIGGER;

  if(dname_subdomain_c(tldlab,
    (uint8_t*)&"\015rpz-client-ip\000"))
    return RPZ_CLIENT_IP_TRIGGER;
  else if(dname_subdomain_c(tldlab, (uint8_t*)&"\006rpz-ip\000"))
    return RPZ_RESPONSE_IP_TRIGGER;
  else if(dname_subdomain_c(tldlab, (uint8_t*)&"\013rpz-nsdname\000"))
    return RPZ_NSDNAME_TRIGGER;
  else if(dname_subdomain_c(tldlab, (uint8_t*)&"\010rpz-nsip\000"))
    return RPZ_NSIP_TRIGGER;

  return RPZ_QNAME_TRIGGER;
}

static inline struct clientip_synthesized_rrset*
rpz_clientip_synthesized_set_create(void)
{
  struct clientip_synthesized_rrset* set = calloc(1, sizeof(*set));
  if(set == NULL) {
    return NULL;
  }
  set->region = regional_create();
  if(set->region == NULL) {
    free(set);
    return NULL;
  }
  addr_tree_init(&set->entries);
  lock_rw_init(&set->lock);
  return set;
}

static void
rpz_clientip_synthesized_rr_delete(rbnode_type* n, void* ATTR_UNUSED(arg))
{
  struct clientip_synthesized_rr* r = (struct clientip_synthesized_rr*)n->key;
  lock_rw_destroy(&r->lock);
#ifdef THREADS_DISABLED
  (void)r;
#endif
}

static inline void
rpz_clientip_synthesized_set_delete(struct clientip_synthesized_rrset* set)
{
  if(set == NULL) {
    return;
  }
  lock_rw_destroy(&set->lock);
  traverse_postorder(&set->entries, rpz_clientip_synthesized_rr_delete, NULL);
  regional_destroy(set->region);
  free(set);
}

void
rpz_delete(struct rpz* r)
{
  if(!r)
    return;
  local_zones_delete(r->local_zones);
  local_zones_delete(r->nsdname_zones);
  respip_set_delete(r->respip_set);
  rpz_clientip_synthesized_set_delete(r->client_set);
  rpz_clientip_synthesized_set_delete(r->ns_set);
  regional_destroy(r->region);
  free(r->taglist);
  free(r->log_name);
  free(r);
}

int
rpz_clear(struct rpz* r)
{
  /* must hold write lock on auth_zone */
  local_zones_delete(r->local_zones);
  r->local_zones = NULL;
  local_zones_delete(r->nsdname_zones);
  r->nsdname_zones = NULL;
  respip_set_delete(r->respip_set);
  r->respip_set = NULL;
  rpz_clientip_synthesized_set_delete(r->client_set);
  r->client_set = NULL;
  rpz_clientip_synthesized_set_delete(r->ns_set);
  r->ns_set = NULL;
  if(!(r->local_zones = local_zones_create())){
    return 0;
  }
  r->nsdname_zones = local_zones_create();
  if(r->nsdname_zones == NULL) {
    return 0;
  }
  if(!(r->respip_set = respip_set_create())) {
    return 0;
  }
  if(!(r->client_set = rpz_clientip_synthesized_set_create())) {
    return 0;
  }
  if(!(r->ns_set = rpz_clientip_synthesized_set_create())) {
    return 0;
  }
  return 1;
}

void
rpz_finish_config(struct rpz* r)
{
  lock_rw_wrlock(&r->respip_set->lock);
  addr_tree_init_parents(&r->respip_set->ip_tree);
  lock_rw_unlock(&r->respip_set->lock);

  lock_rw_wrlock(&r->client_set->lock);
  addr_tree_init_parents(&r->client_set->entries);
  lock_rw_unlock(&r->client_set->lock);

  lock_rw_wrlock(&r->ns_set->lock);
  addr_tree_init_parents(&r->ns_set->entries);
  lock_rw_unlock(&r->ns_set->lock);
}

/** new rrset containing CNAME override, does not yet contain a dname */
static struct ub_packed_rrset_key*
new_cname_override(struct regional* region, uint8_t* ct, size_t ctlen)
{
  struct ub_packed_rrset_key* rrset;
  struct packed_rrset_data* pd;
  uint16_t rdlength = htons(ctlen);
  rrset = (struct ub_packed_rrset_key*)regional_alloc_zero(region,
    sizeof(*rrset));
  if(!rrset) {
    log_err("out of memory");
    return NULL;
  }
  rrset->entry.key = rrset;
  pd = (struct packed_rrset_data*)regional_alloc_zero(region, sizeof(*pd));
  if(!pd) {
    log_err("out of memory");
    return NULL;
  }
  pd->trust = rrset_trust_prim_noglue;
  pd->security = sec_status_insecure;

  pd->count = 1;
  pd->rr_len = regional_alloc_zero(region, sizeof(*pd->rr_len));
  pd->rr_ttl = regional_alloc_zero(region, sizeof(*pd->rr_ttl));
  pd->rr_data = regional_alloc_zero(region, sizeof(*pd->rr_data));
  if(!pd->rr_len || !pd->rr_ttl || !pd->rr_data) {
    log_err("out of memory");
    return NULL;
  }
  pd->rr_len[0] = ctlen+2;
  pd->rr_ttl[0] = 3600;
  pd->rr_data[0] = regional_alloc_zero(region, 2 /* rdlength */ + ctlen);
  if(!pd->rr_data[0]) {
    log_err("out of memory");
    return NULL;
  }
  memmove(pd->rr_data[0], &rdlength, 2);
  memmove(pd->rr_data[0]+2, ct, ctlen);

  rrset->entry.data = pd;
  rrset->rk.type = htons(LDNS_RR_TYPE_CNAME);
  rrset->rk.rrset_class = htons(LDNS_RR_CLASS_IN);
  return rrset;
}

/** delete the cname override */
static void
delete_cname_override(struct rpz* r)
{
  if(r->cname_override) {
    /* The cname override is what is allocated in the region. */
    regional_free_all(r->region);
    r->cname_override = NULL;
  }
}

/** Apply rpz config elements to the rpz structure, false on failure. */
static int
rpz_apply_cfg_elements(struct rpz* r, struct config_auth* p)
{
  if(p->rpz_taglist && p->rpz_taglistlen) {
    r->taglistlen = p->rpz_taglistlen;
    r->taglist = memdup(p->rpz_taglist, r->taglistlen);
    if(!r->taglist) {
      log_err("malloc failure on RPZ taglist alloc");
      return 0;
    }
  }

  if(p->rpz_action_override) {
    r->action_override = rpz_config_to_action(p->rpz_action_override);
  }
  else
    r->action_override = RPZ_NO_OVERRIDE_ACTION;

  if(r->action_override == RPZ_CNAME_OVERRIDE_ACTION) {
    uint8_t nm[LDNS_MAX_DOMAINLEN+1];
    size_t nmlen = sizeof(nm);

    if(!p->rpz_cname) {
      log_err("rpz: override with cname action found, but no "
        "rpz-cname-override configured");
      return 0;
    }

    if(sldns_str2wire_dname_buf(p->rpz_cname, nm, &nmlen) != 0) {
      log_err("rpz: cannot parse cname override: %s",
        p->rpz_cname);
      return 0;
    }
    r->cname_override = new_cname_override(r->region, nm, nmlen);
    if(!r->cname_override) {
      return 0;
    }
  }
  r->log = p->rpz_log;
  r->signal_nxdomain_ra = p->rpz_signal_nxdomain_ra;
  if(p->rpz_log_name) {
    if(!(r->log_name = strdup(p->rpz_log_name))) {
      log_err("malloc failure on RPZ log_name strdup");
      return 0;
    }
  }
  return 1;
}

struct rpz*
rpz_create(struct config_auth* p)
{
  struct rpz* r = calloc(1, sizeof(*r));
  if(!r)
    goto err;

  r->region = regional_create_custom(sizeof(struct regional));
  if(!r->region) {
    goto err;
  }

  if(!(r->local_zones = local_zones_create())){
    goto err;
  }

  r->nsdname_zones = local_zones_create();
  if(r->local_zones == NULL){
    goto err;
  }

  if(!(r->respip_set = respip_set_create())) {
    goto err;
  }

  r->client_set = rpz_clientip_synthesized_set_create();
  if(r->client_set == NULL) {
    goto err;
  }

  r->ns_set = rpz_clientip_synthesized_set_create();
  if(r->ns_set == NULL) {
    goto err;
  }

  if(!rpz_apply_cfg_elements(r, p))
    goto err;
  return r;
err:
  if(r) {
    if(r->local_zones)
      local_zones_delete(r->local_zones);
    if(r->nsdname_zones)
      local_zones_delete(r->nsdname_zones);
    if(r->respip_set)
      respip_set_delete(r->respip_set);
    if(r->client_set != NULL)
      rpz_clientip_synthesized_set_delete(r->client_set);
    if(r->ns_set != NULL)
      rpz_clientip_synthesized_set_delete(r->ns_set);
    if(r->taglist)
      free(r->taglist);
    if(r->region)
      regional_destroy(r->region);
    free(r);
  }
  return NULL;
}

int
rpz_config(struct rpz* r, struct config_auth* p)
{
  /* If the zonefile changes, it is read later, after which
   * rpz_clear and rpz_finish_config is called. */

  /* free taglist, if any */
  if(r->taglist) {
    free(r->taglist);
    r->taglist = NULL;
    r->taglistlen = 0;
  }

  /* free logname, if any */
  if(r->log_name) {
    free(r->log_name);
    r->log_name = NULL;
  }

  delete_cname_override(r);

  if(!rpz_apply_cfg_elements(r, p))
    return 0;
  return 1;
}

/**
 * Remove RPZ zone name from dname
 * Copy dname to newdname, without the originlen number of trailing bytes
 */
static size_t
strip_dname_origin(uint8_t* dname, size_t dnamelen, size_t originlen,
  uint8_t* newdname, size_t maxnewdnamelen)
{
  size_t newdnamelen;
  if(dnamelen < originlen)
    return 0;
  newdnamelen = dnamelen - originlen;
  if(newdnamelen+1 > maxnewdnamelen)
    return 0;
  memmove(newdname, dname, newdnamelen);
  newdname[newdnamelen] = 0;
  return newdnamelen + 1; /* + 1 for root label */
}

static void
rpz_insert_local_zones_trigger(struct local_zones* lz, uint8_t* dname,
  size_t dnamelen, enum rpz_action a, uint16_t rrtype, uint16_t rrclass,
  uint32_t ttl, uint8_t* rdata, size_t rdata_len, uint8_t* rr, size_t rr_len)
{
  struct local_zone* z;
  enum localzone_type tp = local_zone_always_transparent;
  int dnamelabs = dname_count_labels(dname);
  int newzone = 0;

  if(a == RPZ_INVALID_ACTION) {
    char str[LDNS_MAX_DOMAINLEN];
    if(rrtype == LDNS_RR_TYPE_SOA || rrtype == LDNS_RR_TYPE_NS ||
      rrtype == LDNS_RR_TYPE_DNAME ||
      rrtype == LDNS_RR_TYPE_DNSKEY ||
      rrtype == LDNS_RR_TYPE_RRSIG ||
      rrtype == LDNS_RR_TYPE_NSEC ||
      rrtype == LDNS_RR_TYPE_NSEC3PARAM ||
      rrtype == LDNS_RR_TYPE_NSEC3 ||
      rrtype == LDNS_RR_TYPE_DS) {
      free(dname);
      return; /* no need to log these types as unsupported */
    }
    dname_str(dname, str);
    verbose(VERB_ALGO, "rpz: qname trigger, %s skipping unsupported action: %s",
      str, rpz_action_to_string(a));
    free(dname);
    return;
  }

  lock_rw_wrlock(&lz->lock);
  /* exact match */
  z = local_zones_find(lz, dname, dnamelen, dnamelabs, LDNS_RR_CLASS_IN);
  if(z != NULL && a != RPZ_LOCAL_DATA_ACTION) {
    char* rrstr = sldns_wire2str_rr(rr, rr_len);
    if(rrstr == NULL) {
      log_err("malloc error while inserting rpz nsdname trigger");
      free(dname);
      lock_rw_unlock(&lz->lock);
      return;
    }
    if(rrstr[0])
      rrstr[strlen(rrstr)-1]=0; /* remove newline */
    verbose(VERB_ALGO, "rpz: skipping duplicate record: '%s'", rrstr);
    free(rrstr);
    free(dname);
    lock_rw_unlock(&lz->lock);
    return;
  }
  if(z == NULL) {
    tp = rpz_action_to_localzone_type(a);
    z = local_zones_add_zone(lz, dname, dnamelen,
           dnamelabs, rrclass, tp);
    if(z == NULL) {
      log_warn("rpz: create failed");
      lock_rw_unlock(&lz->lock);
      /* dname will be free'd in failed local_zone_create() */
      return;
    }
    newzone = 1;
  }
  if(a == RPZ_LOCAL_DATA_ACTION) {
    char* rrstr = sldns_wire2str_rr(rr, rr_len);
    if(rrstr == NULL) {
      log_err("malloc error while inserting rpz nsdname trigger");
      free(dname);
      lock_rw_unlock(&lz->lock);
      return;
    }
    lock_rw_wrlock(&z->lock);
    local_zone_enter_rr(z, dname, dnamelen, dnamelabs, rrtype,
            rrclass, ttl, rdata, rdata_len, rrstr);
    lock_rw_unlock(&z->lock);
    free(rrstr);
  }
  if(!newzone) {
    free(dname);
  }
  lock_rw_unlock(&lz->lock);
}

static void
rpz_log_dname(char const* msg, uint8_t* dname, size_t dname_len)
{
  char buf[LDNS_MAX_DOMAINLEN];
  (void)dname_len;
  dname_str(dname, buf);
  verbose(VERB_ALGO, "rpz: %s: <%s>", msg, buf);
}

static void
rpz_insert_qname_trigger(struct rpz* r, uint8_t* dname, size_t dnamelen,
  enum rpz_action a, uint16_t rrtype, uint16_t rrclass, uint32_t ttl,
  uint8_t* rdata, size_t rdata_len, uint8_t* rr, size_t rr_len)
{
  if(a == RPZ_INVALID_ACTION) {
    verbose(VERB_ALGO, "rpz: skipping invalid action");
    free(dname);
    return;
  }

  rpz_insert_local_zones_trigger(r->local_zones, dname, dnamelen, a, rrtype,
               rrclass, ttl, rdata, rdata_len, rr, rr_len);
}

static int
rpz_strip_nsdname_suffix(uint8_t* dname, size_t maxdnamelen,
  uint8_t** stripdname, size_t* stripdnamelen)
{
  uint8_t* tldstart = get_tld_label(dname, maxdnamelen);
  uint8_t swap;
  if(tldstart == NULL) {
    if(dname == NULL) {
      *stripdname = NULL;
      *stripdnamelen = 0;
      return 0;
    }
    *stripdname = memdup(dname, maxdnamelen);
    if(!*stripdname) {
      *stripdnamelen = 0;
      log_err("malloc failure for rpz strip suffix");
      return 0;
    }
    *stripdnamelen = maxdnamelen;
    return 1;
  }
  /* shorten the domain name briefly,
   * then we allocate a new name with the correct length */
  swap = *tldstart;
  *tldstart = 0;
  (void)dname_count_size_labels(dname, stripdnamelen);
  *stripdname = memdup(dname, *stripdnamelen);
  *tldstart = swap;
  if(!*stripdname) {
    *stripdnamelen = 0;
    log_err("malloc failure for rpz strip suffix");
    return 0;
  }
  return 1;
}

static void
rpz_insert_nsdname_trigger(struct rpz* r, uint8_t* dname, size_t dnamelen,
  enum rpz_action a, uint16_t rrtype, uint16_t rrclass, uint32_t ttl,
  uint8_t* rdata, size_t rdata_len, uint8_t* rr, size_t rr_len)
{
  uint8_t* dname_stripped = NULL;
  size_t dnamelen_stripped = 0;

  rpz_strip_nsdname_suffix(dname, dnamelen, &dname_stripped,
    &dnamelen_stripped);
  if(a == RPZ_INVALID_ACTION) {
    verbose(VERB_ALGO, "rpz: skipping invalid action");
    free(dname_stripped);
    return;
  }

  /* dname_stripped is consumed or freed by the insert routine */
  rpz_insert_local_zones_trigger(r->nsdname_zones, dname_stripped,
    dnamelen_stripped, a, rrtype, rrclass, ttl, rdata, rdata_len,
    rr, rr_len);
}

static int
rpz_insert_ipaddr_based_trigger(struct respip_set* set, struct sockaddr_storage* addr,
  socklen_t addrlen, int net, enum rpz_action a, uint16_t rrtype,
  uint16_t rrclass, uint32_t ttl, uint8_t* rdata, size_t rdata_len,
  uint8_t* rr, size_t rr_len)
{
  struct resp_addr* node;
  char* rrstr;
  enum respip_action respa = rpz_action_to_respip_action(a);

  lock_rw_wrlock(&set->lock);
  rrstr = sldns_wire2str_rr(rr, rr_len);
  if(rrstr == NULL) {
    log_err("malloc error while inserting rpz ipaddr based trigger");
    lock_rw_unlock(&set->lock);
    return 0;
  }

  node = respip_sockaddr_find_or_create(set, addr, addrlen, net, 1, rrstr);
  if(node == NULL) {
    lock_rw_unlock(&set->lock);
    free(rrstr);
    return 0;
  }

  lock_rw_wrlock(&node->lock);
  lock_rw_unlock(&set->lock);

  node->action = respa;

  if(a == RPZ_LOCAL_DATA_ACTION) {
    respip_enter_rr(set->region, node, rrtype,
        rrclass, ttl, rdata, rdata_len, rrstr, "");
  }

  lock_rw_unlock(&node->lock);
  free(rrstr);
  return 1;
}

static inline struct clientip_synthesized_rr*
rpz_clientip_ensure_entry(struct clientip_synthesized_rrset* set,
  struct sockaddr_storage* addr, socklen_t addrlen, int net)
{
  int insert_ok;
  struct clientip_synthesized_rr* node =
    (struct clientip_synthesized_rr*)addr_tree_find(&set->entries,
                addr, addrlen, net);

  if(node != NULL) { return node; }

  /* node does not yet exist => allocate one */
  node = regional_alloc_zero(set->region, sizeof(*node));
  if(node == NULL) {
    log_err("out of memory");
    return NULL;
  }

  lock_rw_init(&node->lock);
  node->action = RPZ_INVALID_ACTION;
  insert_ok = addr_tree_insert(&set->entries, &node->node,
             addr, addrlen, net);
  if (!insert_ok) {
    log_warn("rpz: unexpected: unable to insert clientip address node");
    /* we can not free the just allocated node.
     * theoretically a memleak */
    return NULL;
  }

  return node;
}

static void
rpz_report_rrset_error(const char* msg, uint8_t* rr, size_t rr_len) {
  char* rrstr = sldns_wire2str_rr(rr, rr_len);
  if(rrstr == NULL) {
    log_err("malloc error while inserting rpz clientip based record");
    return;
  }
  log_err("rpz: unexpected: unable to insert %s: %s", msg, rrstr);
  free(rrstr);
}

/* from localzone.c; difference is we don't have a dname */
static struct local_rrset*
rpz_clientip_new_rrset(struct regional* region,
  struct clientip_synthesized_rr* raddr, uint16_t rrtype, uint16_t rrclass)
{
  struct packed_rrset_data* pd;
  struct local_rrset* rrset = (struct local_rrset*)
    regional_alloc_zero(region, sizeof(*rrset));
  if(rrset == NULL) {
    log_err("out of memory");
    return NULL;
  }
  rrset->next = raddr->data;
  raddr->data = rrset;
  rrset->rrset = (struct ub_packed_rrset_key*)
    regional_alloc_zero(region, sizeof(*rrset->rrset));
  if(rrset->rrset == NULL) {
    log_err("out of memory");
    return NULL;
  }
  rrset->rrset->entry.key = rrset->rrset;
  pd = (struct packed_rrset_data*)regional_alloc_zero(region, sizeof(*pd));
  if(pd == NULL) {
    log_err("out of memory");
    return NULL;
  }
  pd->trust = rrset_trust_prim_noglue;
  pd->security = sec_status_insecure;
  rrset->rrset->entry.data = pd;
  rrset->rrset->rk.type = htons(rrtype);
  rrset->rrset->rk.rrset_class = htons(rrclass);
  rrset->rrset->rk.dname = regional_alloc_zero(region, 1);
  if(rrset->rrset->rk.dname == NULL) {
    log_err("out of memory");
    return NULL;
  }
  rrset->rrset->rk.dname_len = 1;
  return rrset;
}

static int
rpz_clientip_enter_rr(struct regional* region, struct clientip_synthesized_rr* raddr,
  uint16_t rrtype, uint16_t rrclass, time_t ttl, uint8_t* rdata,
  size_t rdata_len)
{
  struct local_rrset* rrset;
  if (rrtype == LDNS_RR_TYPE_CNAME && raddr->data != NULL) {
    log_err("CNAME response-ip data can not co-exist with other "
      "client-ip data");
    return 0;
  }

  rrset = rpz_clientip_new_rrset(region, raddr, rrtype, rrclass);
  if(raddr->data == NULL) {
    return 0;
  }

  return rrset_insert_rr(region, rrset->rrset->entry.data, rdata, rdata_len, ttl, "");
}

static int
rpz_clientip_insert_trigger_rr(struct clientip_synthesized_rrset* set, struct sockaddr_storage* addr,
  socklen_t addrlen, int net, enum rpz_action a, uint16_t rrtype,
  uint16_t rrclass, uint32_t ttl, uint8_t* rdata, size_t rdata_len,
  uint8_t* rr, size_t rr_len)
{
  struct clientip_synthesized_rr* node;

  lock_rw_wrlock(&set->lock);

  node = rpz_clientip_ensure_entry(set, addr, addrlen, net);
  if(node == NULL) {
    lock_rw_unlock(&set->lock);
    rpz_report_rrset_error("client ip address", rr, rr_len);
    return 0;
  }

  lock_rw_wrlock(&node->lock);
  lock_rw_unlock(&set->lock);

  node->action = a;
  if(a == RPZ_LOCAL_DATA_ACTION) {
    if(!rpz_clientip_enter_rr(set->region, node, rrtype,
      rrclass, ttl, rdata, rdata_len)) {
      verbose(VERB_ALGO, "rpz: unable to insert clientip rr");
      lock_rw_unlock(&node->lock);
      return 0;
    }

  }

  lock_rw_unlock(&node->lock);

  return 1;
}

static int
rpz_insert_clientip_trigger(struct rpz* r, uint8_t* dname, size_t dnamelen,
  enum rpz_action a, uint16_t rrtype, uint16_t rrclass, uint32_t ttl,
  uint8_t* rdata, size_t rdata_len, uint8_t* rr, size_t rr_len)
{
  struct sockaddr_storage addr;
  socklen_t addrlen;
  int net, af;

  if(a == RPZ_INVALID_ACTION) {
    return 0;
  }

  if(!netblockdnametoaddr(dname, dnamelen, &addr, &addrlen, &net, &af)) {
    verbose(VERB_ALGO, "rpz: unable to parse client ip");
    return 0;
  }

  return rpz_clientip_insert_trigger_rr(r->client_set, &addr, addrlen, net,
      a, rrtype, rrclass, ttl, rdata, rdata_len, rr, rr_len);
}

static int
rpz_insert_nsip_trigger(struct rpz* r, uint8_t* dname, size_t dnamelen,
  enum rpz_action a, uint16_t rrtype, uint16_t rrclass, uint32_t ttl,
  uint8_t* rdata, size_t rdata_len, uint8_t* rr, size_t rr_len)
{
  struct sockaddr_storage addr;
  socklen_t addrlen;
  int net, af;

  if(a == RPZ_INVALID_ACTION) {
    return 0;
  }

  if(!netblockdnametoaddr(dname, dnamelen, &addr, &addrlen, &net, &af)) {
    verbose(VERB_ALGO, "rpz: unable to parse ns ip");
    return 0;
  }

  return rpz_clientip_insert_trigger_rr(r->ns_set, &addr, addrlen, net,
      a, rrtype, rrclass, ttl, rdata, rdata_len, rr, rr_len);
}

/** Insert RR into RPZ's respip_set */
static int
rpz_insert_response_ip_trigger(struct rpz* r, uint8_t* dname, size_t dnamelen,
  enum rpz_action a, uint16_t rrtype, uint16_t rrclass, uint32_t ttl,
  uint8_t* rdata, size_t rdata_len, uint8_t* rr, size_t rr_len)
{
  struct sockaddr_storage addr;
  socklen_t addrlen;
  int net, af;

  if(a == RPZ_INVALID_ACTION) {
    return 0;
  }

  if(!netblockdnametoaddr(dname, dnamelen, &addr, &addrlen, &net, &af)) {
    verbose(VERB_ALGO, "rpz: unable to parse response ip");
    return 0;
  }

  if(a == RPZ_INVALID_ACTION ||
    rpz_action_to_respip_action(a) == respip_invalid) {
    char str[LDNS_MAX_DOMAINLEN];
    dname_str(dname, str);
    verbose(VERB_ALGO, "rpz: respip trigger, %s skipping unsupported action: %s",
      str, rpz_action_to_string(a));
    return 0;
  }

  return rpz_insert_ipaddr_based_trigger(r->respip_set, &addr, addrlen, net,
      a, rrtype, rrclass, ttl, rdata, rdata_len, rr, rr_len);
}

int
rpz_insert_rr(struct rpz* r, uint8_t* azname, size_t aznamelen, uint8_t* dname,
  size_t dnamelen, uint16_t rr_type, uint16_t rr_class, uint32_t rr_ttl,
  uint8_t* rdatawl, size_t rdatalen, uint8_t* rr, size_t rr_len)
{
  size_t policydnamelen;
  /* name is free'd in local_zone delete */
  enum rpz_trigger t;
  enum rpz_action a;
  uint8_t* policydname;

  if(rpz_type_ignored(rr_type)) {
    /* this rpz action is not valid, eg. this is the SOA or NS RR */
    return 1;
  }
  if(!dname_subdomain_c(dname, azname)) {
    char* dname_str = sldns_wire2str_dname(dname, dnamelen);
    char* azname_str = sldns_wire2str_dname(azname, aznamelen);
    if(dname_str && azname_str) {
      log_err("rpz: name of record (%s) to insert into RPZ is not a "
        "subdomain of the configured name of the RPZ zone (%s)",
        dname_str, azname_str);
    } else {
      log_err("rpz: name of record to insert into RPZ is not a "
        "subdomain of the configured name of the RPZ zone");
    }
    free(dname_str);
    free(azname_str);
    return 0;
  }

  log_assert(dnamelen >= aznamelen);
  if(!(policydname = calloc(1, (dnamelen-aznamelen)+1))) {
    log_err("malloc error while inserting RPZ RR");
    return 0;
  }

  a = rpz_rr_to_action(rr_type, rdatawl, rdatalen);
  if(!(policydnamelen = strip_dname_origin(dname, dnamelen, aznamelen,
    policydname, (dnamelen-aznamelen)+1))) {
    free(policydname);
    return 0;
  }
  t = rpz_dname_to_trigger(policydname, policydnamelen);
  if(t == RPZ_INVALID_TRIGGER) {
    free(policydname);
    verbose(VERB_ALGO, "rpz: skipping invalid trigger");
    return 1;
  }
  if(t == RPZ_QNAME_TRIGGER) {
    /* policydname will be consumed, no free */
    rpz_insert_qname_trigger(r, policydname, policydnamelen,
      a, rr_type, rr_class, rr_ttl, rdatawl, rdatalen, rr,
      rr_len);
  } else if(t == RPZ_RESPONSE_IP_TRIGGER) {
    rpz_insert_response_ip_trigger(r, policydname, policydnamelen,
      a, rr_type, rr_class, rr_ttl, rdatawl, rdatalen, rr,
      rr_len);
    free(policydname);
  } else if(t == RPZ_CLIENT_IP_TRIGGER) {
    rpz_insert_clientip_trigger(r, policydname, policydnamelen,
      a, rr_type, rr_class, rr_ttl, rdatawl, rdatalen, rr,
      rr_len);
    free(policydname);
  } else if(t == RPZ_NSIP_TRIGGER) {
    rpz_insert_nsip_trigger(r, policydname, policydnamelen,
      a, rr_type, rr_class, rr_ttl, rdatawl, rdatalen, rr,
      rr_len);
    free(policydname);
  } else if(t == RPZ_NSDNAME_TRIGGER) {
    rpz_insert_nsdname_trigger(r, policydname, policydnamelen,
      a, rr_type, rr_class, rr_ttl, rdatawl, rdatalen, rr,
      rr_len);
    free(policydname);
  } else {
    free(policydname);
    verbose(VERB_ALGO, "rpz: skipping unsupported trigger: %s",
      rpz_trigger_to_string(t));
  }
  return 1;
}

/**
 * Find RPZ local-zone by qname.
 * @param zones: local-zone tree
 * @param qname: qname
 * @param qname_len: length of qname
 * @param qclass: qclass
 * @param only_exact: if 1 only exact (non wildcard) matches are returned
 * @param wr: get write lock for local-zone if 1, read lock if 0
 * @param zones_keep_lock: if set do not release the r->local_zones lock, this
 *    makes the caller of this function responsible for releasing the lock.
 * @return: NULL or local-zone holding rd or wr lock
 */
static struct local_zone*
rpz_find_zone(struct local_zones* zones, uint8_t* qname, size_t qname_len, uint16_t qclass,
  int only_exact, int wr, int zones_keep_lock)
{
  uint8_t* ce;
  size_t ce_len;
  int ce_labs;
  uint8_t wc[LDNS_MAX_DOMAINLEN+1];
  int exact;
  struct local_zone* z = NULL;

  if(wr) {
    lock_rw_wrlock(&zones->lock);
  } else {
    lock_rw_rdlock(&zones->lock);
  }
  z = local_zones_find_le(zones, qname, qname_len,
    dname_count_labels(qname),
    LDNS_RR_CLASS_IN, &exact);
  if(!z || (only_exact && !exact)) {
    if(!zones_keep_lock) {
      lock_rw_unlock(&zones->lock);
    }
    return NULL;
  }
  if(wr) {
    lock_rw_wrlock(&z->lock);
  } else {
    lock_rw_rdlock(&z->lock);
  }
  if(!zones_keep_lock) {
    lock_rw_unlock(&zones->lock);
  }

  if(exact)
    return z;

  /* No exact match found, lookup wildcard. closest encloser must
   * be the shared parent between the qname and the best local
   * zone match, append '*' to that and do another lookup. */

  ce = dname_get_shared_topdomain(z->name, qname);
  if(!ce /* should not happen */) {
    lock_rw_unlock(&z->lock);
    if(zones_keep_lock) {
      lock_rw_unlock(&zones->lock);
    }
    return NULL;
  }
  ce_labs = dname_count_size_labels(ce, &ce_len);
  if(ce_len+2 > sizeof(wc)) {
    lock_rw_unlock(&z->lock);
    if(zones_keep_lock) {
      lock_rw_unlock(&zones->lock);
    }
    return NULL;
  }
  wc[0] = 1; /* length of wildcard label */
  wc[1] = (uint8_t)'*'; /* wildcard label */
  memmove(wc+2, ce, ce_len);
  lock_rw_unlock(&z->lock);

  if(!zones_keep_lock) {
    if(wr) {
      lock_rw_wrlock(&zones->lock);
    } else {
      lock_rw_rdlock(&zones->lock);
    }
  }
  z = local_zones_find_le(zones, wc,
    ce_len+2, ce_labs+1, qclass, &exact);
  if(!z || !exact) {
    lock_rw_unlock(&zones->lock);
    return NULL;
  }
  if(wr) {
    lock_rw_wrlock(&z->lock);
  } else {
    lock_rw_rdlock(&z->lock);
  }
  if(!zones_keep_lock) {
    lock_rw_unlock(&zones->lock);
  }
  return z;
}

/** Find entry for RR type in the list of rrsets for the clientip. */
static struct local_rrset*
rpz_find_synthesized_rrset(uint16_t qtype,
  struct clientip_synthesized_rr* data, int alias_ok)
{
  struct local_rrset* cursor = data->data, *cname = NULL;
  while( cursor != NULL) {
    struct packed_rrset_key* packed_rrset = &cursor->rrset->rk;
    if(htons(qtype) == packed_rrset->type) {
      return cursor;
    }
    if(ntohs(packed_rrset->type) == LDNS_RR_TYPE_CNAME && alias_ok)
      cname = cursor;
    cursor = cursor->next;
  }
  if(alias_ok)
    return cname;
  return NULL;
}

/**
 * Remove RR from RPZ's local-data
 * @param z: local-zone for RPZ, holding write lock
 * @param policydname: dname of RR to remove
 * @param policydnamelen: length of policydname
 * @param rr_type: RR type of RR to remove
 * @param rdata: rdata of RR to remove
 * @param rdatalen: length of rdata
 * @return: 1 if zone must be removed after RR deletion
 */
static int
rpz_data_delete_rr(struct local_zone* z, uint8_t* policydname,
  size_t policydnamelen, uint16_t rr_type, uint8_t* rdata,
  size_t rdatalen)
{
  struct local_data* ld;
  struct packed_rrset_data* d;
  size_t index;
  ld = local_zone_find_data(z, policydname, policydnamelen,
    dname_count_labels(policydname));
  if(ld) {
    struct local_rrset* prev=NULL, *p=ld->rrsets;
    while(p && ntohs(p->rrset->rk.type) != rr_type) {
      prev = p;
      p = p->next;
    }
    if(!p)
      return 0;
    d = (struct packed_rrset_data*)p->rrset->entry.data;
    if(packed_rrset_find_rr(d, rdata, rdatalen, &index)) {
      if(d->count == 1) {
        /* no memory recycling for zone deletions ... */
        if(prev) prev->next = p->next;
        else ld->rrsets = p->next;
      }
      if(d->count > 1) {
        if(!local_rrset_remove_rr(d, index))
          return 0;
      }
    }
  }
  if(ld && ld->rrsets)
    return 0;
  return 1;
}

/**
 * Remove RR from RPZ's respip set
 * @param raddr: respip node
 * @param rr_type: RR type of RR to remove
 * @param rdata: rdata of RR to remove
 * @param rdatalen: length of rdata
 * @return: 1 if zone must be removed after RR deletion
 */
static int
rpz_rrset_delete_rr(struct resp_addr* raddr, uint16_t rr_type, uint8_t* rdata,
  size_t rdatalen)
{
  size_t index;
  struct packed_rrset_data* d;
  if(!raddr->data)
    return 1;
  d = raddr->data->entry.data;
  if(ntohs(raddr->data->rk.type) != rr_type) {
    return 0;
  }
  if(packed_rrset_find_rr(d, rdata, rdatalen, &index)) {
    if(d->count == 1) {
      /* regional alloc'd */
      raddr->data->entry.data = NULL; 
      raddr->data = NULL;
      return 1;
    }
    if(d->count > 1) {
      if(!local_rrset_remove_rr(d, index))
        return 0;
    }
  }
  return 0;

}

/** Remove RR from rpz localzones structure */
static void
rpz_remove_local_zones_trigger(struct local_zones* zones, uint8_t* dname,
  size_t dnamelen, enum rpz_action a, uint16_t rr_type,
  uint16_t rr_class, uint8_t* rdatawl, size_t rdatalen)
{
  struct local_zone* z;
  int delete_zone = 1;
  z = rpz_find_zone(zones, dname, dnamelen, rr_class,
    1 /* only exact */, 1 /* wr lock */, 1 /* keep lock*/);
  if(!z) {
    verbose(VERB_ALGO, "rpz: cannot remove RR from IXFR, "
      "RPZ domain not found");
    return;
  }
  if(a == RPZ_LOCAL_DATA_ACTION)
    delete_zone = rpz_data_delete_rr(z, dname,
      dnamelen, rr_type, rdatawl, rdatalen);
  else if(a != localzone_type_to_rpz_action(z->type)) {
    lock_rw_unlock(&z->lock);
    lock_rw_unlock(&zones->lock);
    return;
  }
  lock_rw_unlock(&z->lock); 
  if(delete_zone) {
    local_zones_del_zone(zones, z);
  }
  lock_rw_unlock(&zones->lock);
}

/** Remove RR from RPZ's local-zone */
static void
rpz_remove_qname_trigger(struct rpz* r, uint8_t* dname, size_t dnamelen,
  enum rpz_action a, uint16_t rr_type, uint16_t rr_class,
  uint8_t* rdatawl, size_t rdatalen)
{
  rpz_remove_local_zones_trigger(r->local_zones, dname, dnamelen,
    a, rr_type, rr_class, rdatawl, rdatalen);
}

static void
rpz_remove_response_ip_trigger(struct rpz* r, uint8_t* dname, size_t dnamelen,
  enum rpz_action a, uint16_t rr_type, uint8_t* rdatawl, size_t rdatalen)
{
  struct resp_addr* node;
  struct sockaddr_storage addr;
  socklen_t addrlen;
  int net, af;
  int delete_respip = 1;

  if(!netblockdnametoaddr(dname, dnamelen, &addr, &addrlen, &net, &af))
    return;

  lock_rw_wrlock(&r->respip_set->lock);
  if(!(node = (struct resp_addr*)addr_tree_find(
    &r->respip_set->ip_tree, &addr, addrlen, net))) {
    verbose(VERB_ALGO, "rpz: cannot remove RR from IXFR, "
      "RPZ domain not found");
    lock_rw_unlock(&r->respip_set->lock);
    return;
  }

  lock_rw_wrlock(&node->lock);
  if(a == RPZ_LOCAL_DATA_ACTION) {
    /* remove RR, signal whether RR can be removed */
    delete_respip = rpz_rrset_delete_rr(node, rr_type, rdatawl, 
      rdatalen);
  }
  lock_rw_unlock(&node->lock);
  if(delete_respip)
    respip_sockaddr_delete(r->respip_set, node);
  lock_rw_unlock(&r->respip_set->lock);
}

/** find and remove type from list of local_rrset entries*/
static void
del_local_rrset_from_list(struct local_rrset** list_head, uint16_t dtype)
{
  struct local_rrset* prev=NULL, *p=*list_head;
  while(p && ntohs(p->rrset->rk.type) != dtype) {
    prev = p;
    p = p->next;
  }
  if(!p)
    return; /* rrset type not found */
  /* unlink it */
  if(prev) prev->next = p->next;
  else *list_head = p->next;
  /* no memory recycling for zone deletions ... */
}

/** Delete client-ip trigger RR from its RRset and perhaps also the rrset
 * from the linked list. Returns if the local data is empty and the node can
 * be deleted too, or not. */
static int rpz_remove_clientip_rr(struct clientip_synthesized_rr* node,
  uint16_t rr_type, uint8_t* rdatawl, size_t rdatalen)
{
  struct local_rrset* rrset;
  struct packed_rrset_data* d;
  size_t index;
  rrset = rpz_find_synthesized_rrset(rr_type, node, 0);
  if(rrset == NULL)
    return 0; /* type not found, ignore */
  d = (struct packed_rrset_data*)rrset->rrset->entry.data;
  if(!packed_rrset_find_rr(d, rdatawl, rdatalen, &index))
    return 0; /* RR not found, ignore */
  if(d->count == 1) {
    /* regional alloc'd */
    /* delete the type entry from the list */
    del_local_rrset_from_list(&node->data, rr_type);
    /* if the list is empty, the node can be removed too */
    if(node->data == NULL)
      return 1;
  } else if (d->count > 1) {
    if(!local_rrset_remove_rr(d, index))
      return 0;
  }
  return 0;
}

/** remove trigger RR from clientip_syntheized set tree. */
static void
rpz_clientip_remove_trigger_rr(struct clientip_synthesized_rrset* set,
  struct sockaddr_storage* addr, socklen_t addrlen, int net,
  enum rpz_action a, uint16_t rr_type, uint8_t* rdatawl, size_t rdatalen)
{
  struct clientip_synthesized_rr* node;
  int delete_node = 1;

  lock_rw_wrlock(&set->lock);
  node = (struct clientip_synthesized_rr*)addr_tree_find(&set->entries,
    addr, addrlen, net);
  if(node == NULL) {
    /* netblock not found */
    verbose(VERB_ALGO, "rpz: cannot remove RR from IXFR, "
      "RPZ address, netblock not found");
    lock_rw_unlock(&set->lock);
    return;
  }
  lock_rw_wrlock(&node->lock);
  if(a == RPZ_LOCAL_DATA_ACTION) {
    /* remove RR, signal whether entry can be removed */
    delete_node = rpz_remove_clientip_rr(node, rr_type, rdatawl,
      rdatalen);
  } else if(a != node->action) {
    /* ignore the RR with different action specification */
    delete_node = 0;
  }
  if(delete_node) {
    rbtree_delete(&set->entries, node->node.node.key);
  }
  lock_rw_unlock(&set->lock);
  lock_rw_unlock(&node->lock);
  if(delete_node) {
    lock_rw_destroy(&node->lock);
  }
}

/** Remove clientip trigger RR from RPZ. */
static void
rpz_remove_clientip_trigger(struct rpz* r, uint8_t* dname, size_t dnamelen,
  enum rpz_action a, uint16_t rr_type, uint8_t* rdatawl, size_t rdatalen)
{
  struct sockaddr_storage addr;
  socklen_t addrlen;
  int net, af;
  if(a == RPZ_INVALID_ACTION)
    return;
  if(!netblockdnametoaddr(dname, dnamelen, &addr, &addrlen, &net, &af))
    return;
  rpz_clientip_remove_trigger_rr(r->client_set, &addr, addrlen, net,
    a, rr_type, rdatawl, rdatalen);
}

/** Remove nsip trigger RR from RPZ. */
static void
rpz_remove_nsip_trigger(struct rpz* r, uint8_t* dname, size_t dnamelen,
  enum rpz_action a, uint16_t rr_type, uint8_t* rdatawl, size_t rdatalen)
{
  struct sockaddr_storage addr;
  socklen_t addrlen;
  int net, af;
  if(a == RPZ_INVALID_ACTION)
    return;
  if(!netblockdnametoaddr(dname, dnamelen, &addr, &addrlen, &net, &af))
    return;
  rpz_clientip_remove_trigger_rr(r->ns_set, &addr, addrlen, net,
    a, rr_type, rdatawl, rdatalen);
}

/** Remove nsdname trigger RR from RPZ. */
static void
rpz_remove_nsdname_trigger(struct rpz* r, uint8_t* dname, size_t dnamelen,
  enum rpz_action a, uint16_t rr_type, uint16_t rr_class,
  uint8_t* rdatawl, size_t rdatalen)
{
  uint8_t* dname_stripped = NULL;
  size_t dnamelen_stripped = 0;
  if(a == RPZ_INVALID_ACTION)
    return;
  if(!rpz_strip_nsdname_suffix(dname, dnamelen, &dname_stripped,
    &dnamelen_stripped))
    return;
  rpz_remove_local_zones_trigger(r->nsdname_zones, dname_stripped,
    dnamelen_stripped, a, rr_type, rr_class, rdatawl, rdatalen);
  free(dname_stripped);
}

void
rpz_remove_rr(struct rpz* r, uint8_t* azname, size_t aznamelen, uint8_t* dname,
  size_t dnamelen, uint16_t rr_type, uint16_t rr_class, uint8_t* rdatawl,
  size_t rdatalen)
{
  size_t policydnamelen;
  enum rpz_trigger t;
  enum rpz_action a;
  uint8_t* policydname;

  if(rpz_type_ignored(rr_type)) {
    /* this rpz action is not valid, eg. this is the SOA or NS RR */
    return;
  }
  if(!dname_subdomain_c(dname, azname)) {
    /* not subdomain of the RPZ zone. */
    return;
  }

  if(!(policydname = calloc(1, LDNS_MAX_DOMAINLEN + 1)))
    return;

  a = rpz_rr_to_action(rr_type, rdatawl, rdatalen);
  if(a == RPZ_INVALID_ACTION) {
    free(policydname);
    return;
  }
  if(!(policydnamelen = strip_dname_origin(dname, dnamelen, aznamelen,
    policydname, LDNS_MAX_DOMAINLEN + 1))) {
    free(policydname);
    return;
  }
  t = rpz_dname_to_trigger(policydname, policydnamelen);
  if(t == RPZ_INVALID_TRIGGER) {
    /* skipping invalid trigger */
    free(policydname);
    return;
  }
  if(t == RPZ_QNAME_TRIGGER) {
    rpz_remove_qname_trigger(r, policydname, policydnamelen, a,
      rr_type, rr_class, rdatawl, rdatalen);
  } else if(t == RPZ_RESPONSE_IP_TRIGGER) {
    rpz_remove_response_ip_trigger(r, policydname, policydnamelen,
      a, rr_type, rdatawl, rdatalen);
  } else if(t == RPZ_CLIENT_IP_TRIGGER) {
    rpz_remove_clientip_trigger(r, policydname, policydnamelen, a,
      rr_type, rdatawl, rdatalen);
  } else if(t == RPZ_NSIP_TRIGGER) {
    rpz_remove_nsip_trigger(r, policydname, policydnamelen, a,
      rr_type, rdatawl, rdatalen);
  } else if(t == RPZ_NSDNAME_TRIGGER) {
    rpz_remove_nsdname_trigger(r, policydname, policydnamelen, a,
      rr_type, rr_class, rdatawl, rdatalen);
  }
  /* else it was an unsupported trigger, also skipped. */
  free(policydname);
}

/** print log information for an applied RPZ policy. Based on local-zone's
 * lz_inform_print().
 * The repinfo contains the reply address. If it is NULL, the module
 * state is used to report the first IP address (if any).
 * The dname is used, for the applied rpz, if NULL, addrnode is used.
 */
static void
log_rpz_apply(char* trigger, uint8_t* dname, struct addr_tree_node* addrnode,
  enum rpz_action a, struct query_info* qinfo,
  struct comm_reply* repinfo, struct module_qstate* ms, char* log_name)
{
  char ip[128], txt[512], portstr[32];
  char dnamestr[LDNS_MAX_DOMAINLEN];
  uint16_t port = 0;
  if(dname) {
    dname_str(dname, dnamestr);
  } else if(addrnode) {
    char addrbuf[128];
    addr_to_str(&addrnode->addr, addrnode->addrlen, addrbuf, sizeof(addrbuf));
    snprintf(dnamestr, sizeof(dnamestr), "%s/%d", addrbuf, addrnode->net);
  } else {
    dnamestr[0]=0;
  }
  if(repinfo) {
    addr_to_str(&repinfo->client_addr, repinfo->client_addrlen, ip, sizeof(ip));
    port = ntohs(((struct sockaddr_in*)&repinfo->client_addr)->sin_port);
  } else if(ms && ms->mesh_info && ms->mesh_info->reply_list) {
    addr_to_str(&ms->mesh_info->reply_list->query_reply.client_addr,
      ms->mesh_info->reply_list->query_reply.client_addrlen,
      ip, sizeof(ip));
    port = ntohs(((struct sockaddr_in*)&ms->mesh_info->reply_list->query_reply.client_addr)->sin_port);
  } else {
    ip[0]=0;
    port = 0;
  }
  snprintf(portstr, sizeof(portstr), "@%u", (unsigned)port);
  snprintf(txt, sizeof(txt), "rpz: applied %s%s%s%s%s%s %s %s%s",
    (log_name?"[":""), (log_name?log_name:""), (log_name?"] ":""),
    (strcmp(trigger,"qname")==0?"":trigger),
    (strcmp(trigger,"qname")==0?"":" "),
    dnamestr, rpz_action_to_string(a),
    (ip[0]?ip:""), (ip[0]?portstr:""));
  log_nametypeclass(0, txt, qinfo->qname, qinfo->qtype, qinfo->qclass);
}

static struct clientip_synthesized_rr*
rpz_ipbased_trigger_lookup(struct clientip_synthesized_rrset* set,
  struct sockaddr_storage* addr, socklen_t addrlen, char* triggername)
{
  struct clientip_synthesized_rr* raddr = NULL;
  enum rpz_action action = RPZ_INVALID_ACTION;

  lock_rw_rdlock(&set->lock);

  raddr = (struct clientip_synthesized_rr*)addr_tree_lookup(&set->entries,
      addr, addrlen);
  if(raddr != NULL) {
    lock_rw_rdlock(&raddr->lock);
    action = raddr->action;
    if(verbosity >= VERB_ALGO) {
      char ip[256], net[256];
      addr_to_str(addr, addrlen, ip, sizeof(ip));
      addr_to_str(&raddr->node.addr, raddr->node.addrlen,
        net, sizeof(net));
      verbose(VERB_ALGO, "rpz: trigger %s %s/%d on %s action=%s",
        triggername, net, raddr->node.net, ip, rpz_action_to_string(action));
    }
  }
  lock_rw_unlock(&set->lock);

  return raddr;
}

static inline
struct clientip_synthesized_rr*
rpz_resolve_client_action_and_zone(struct auth_zones* az, struct query_info* qinfo,
  struct comm_reply* repinfo, uint8_t* taglist, size_t taglen,
  struct ub_server_stats* stats,
  /* output parameters */
  struct local_zone** z_out, struct auth_zone** a_out, struct rpz** r_out)
{
  struct clientip_synthesized_rr* node = NULL;
  struct auth_zone* a = NULL;
  struct rpz* r = NULL;
  struct local_zone* z = NULL;

  lock_rw_rdlock(&az->rpz_lock);

  for(a = az->rpz_first; a; a = a->rpz_az_next) {
    lock_rw_rdlock(&a->lock);
    r = a->rpz;
    if(r->disabled) {
      lock_rw_unlock(&a->lock);
      continue;
    }
    if(r->taglist && !taglist_intersect(r->taglist,
          r->taglistlen, taglist, taglen)) {
      lock_rw_unlock(&a->lock);
      continue;
    }
    z = rpz_find_zone(r->local_zones, qinfo->qname, qinfo->qname_len,
      qinfo->qclass, 0, 0, 0);
    node = rpz_ipbased_trigger_lookup(r->client_set,
      &repinfo->client_addr, repinfo->client_addrlen,
      "clientip");
    if((z || node) && r->action_override == RPZ_DISABLED_ACTION) {
      if(r->log)
        log_rpz_apply((node?"clientip":"qname"),
          (z?z->name:NULL),
          (node?&node->node:NULL),
          r->action_override,
          qinfo, repinfo, NULL, r->log_name);
      stats->rpz_action[r->action_override]++;
      if(z != NULL) {
        lock_rw_unlock(&z->lock);
        z = NULL;
      }
      if(node != NULL) {
        lock_rw_unlock(&node->lock);
        node = NULL;
      }
    }
    if(z || node) {
      break;
    }
    /* not found in this auth_zone */
    lock_rw_unlock(&a->lock);
  }

  lock_rw_unlock(&az->rpz_lock);

  *r_out = r;
  *a_out = a;
  *z_out = z;

  return node;
}

static inline int
rpz_is_udp_query(struct comm_reply* repinfo) {
  return repinfo != NULL
      ? (repinfo->c != NULL
        ? repinfo->c->type == comm_udp
        : 0)
      : 0;
}

/** encode answer consisting of 1 rrset */
static int
rpz_local_encode(struct module_env* env, struct query_info* qinfo,
  struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* buf,
  struct regional* temp, struct ub_packed_rrset_key* rrset, int ansec,
  int rcode, struct ub_packed_rrset_key* soa_rrset)
{
  struct reply_info rep;
  uint16_t udpsize;
  struct ub_packed_rrset_key* rrsetlist[3];

  memset(&rep, 0, sizeof(rep));
  rep.flags = (uint16_t)((BIT_QR | BIT_AA | BIT_RA) | rcode);
  rep.qdcount = 1;
  rep.rrset_count = ansec;
  rep.rrsets = rrsetlist;
  if(ansec > 0) {
    rep.an_numrrsets = 1;
    rep.rrsets[0] = rrset;
    rep.ttl = ((struct packed_rrset_data*)rrset->entry.data)->rr_ttl[0];
  }
  if(soa_rrset != NULL) {
    rep.ar_numrrsets = 1;
    rep.rrsets[rep.rrset_count] = soa_rrset;
    rep.rrset_count ++;
    if(rep.ttl < ((struct packed_rrset_data*)soa_rrset->entry.data)->rr_ttl[0]) {
      rep.ttl = ((struct packed_rrset_data*)soa_rrset->entry.data)->rr_ttl[0];
    }
  }

  udpsize = edns->udp_size;
  edns->edns_version = EDNS_ADVERTISED_VERSION;
  edns->udp_size = EDNS_ADVERTISED_SIZE;
  edns->ext_rcode = 0;
  edns->bits &= EDNS_DO;
  if(!inplace_cb_reply_local_call(env, qinfo, NULL, &rep, rcode, edns,
    repinfo, temp, env->now_tv) ||
    !reply_info_answer_encode(qinfo, &rep,
    *(uint16_t*)sldns_buffer_begin(buf), sldns_buffer_read_u16_at(buf, 2),
    buf, 0, 0, temp, udpsize, edns, (int)(edns->bits&EDNS_DO), 0)) {
    error_encode(buf, (LDNS_RCODE_SERVFAIL|BIT_AA), qinfo,
      *(uint16_t*)sldns_buffer_begin(buf),
      sldns_buffer_read_u16_at(buf, 2), edns);
  }

  return 1;
}

/** allocate SOA record ubrrsetkey in region */
static struct ub_packed_rrset_key*
make_soa_ubrrset(struct auth_zone* auth_zone, struct auth_rrset* soa,
  struct regional* temp)
{
  struct ub_packed_rrset_key csoa;
  if(!soa)
    return NULL;
  memset(&csoa, 0, sizeof(csoa));
  csoa.entry.key = &csoa;
  csoa.rk.rrset_class = htons(LDNS_RR_CLASS_IN);
  csoa.rk.type = htons(LDNS_RR_TYPE_SOA);
  csoa.rk.flags |= PACKED_RRSET_FIXEDTTL
    | PACKED_RRSET_RPZ;
  csoa.rk.dname = auth_zone->name;
  csoa.rk.dname_len = auth_zone->namelen;
  csoa.entry.hash = rrset_key_hash(&csoa.rk);
  csoa.entry.data = soa->data;
  return respip_copy_rrset(&csoa, temp);
}

static void
rpz_apply_clientip_localdata_action(struct clientip_synthesized_rr* raddr,
  struct module_env* env, struct query_info* qinfo,
  struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* buf,
  struct regional* temp, struct auth_zone* auth_zone)
{
  struct local_rrset* rrset;
  enum rpz_action action = RPZ_INVALID_ACTION;
  struct ub_packed_rrset_key* rp = NULL;
  struct ub_packed_rrset_key* rsoa = NULL;
  int rcode = LDNS_RCODE_NOERROR|BIT_AA;
  int rrset_count = 1;

  /* prepare synthesized answer for client */
  action = raddr->action;
  if(action == RPZ_LOCAL_DATA_ACTION && raddr->data == NULL ) {
    verbose(VERB_ALGO, "rpz: bug: local-data action but no local data");
    return;
  }

  /* check query type / rr type */
  rrset = rpz_find_synthesized_rrset(qinfo->qtype, raddr, 1);
  if(rrset == NULL) {
    verbose(VERB_ALGO, "rpz: unable to find local-data for query");
    rrset_count = 0;
    goto nodata;
  }

  rp = respip_copy_rrset(rrset->rrset, temp);
  if(!rp) {
    verbose(VERB_ALGO, "rpz: local data action: out of memory");
    return;
  }

  rp->rk.flags |= PACKED_RRSET_FIXEDTTL | PACKED_RRSET_RPZ;
  rp->rk.dname = qinfo->qname;
  rp->rk.dname_len = qinfo->qname_len;
  rp->entry.hash = rrset_key_hash(&rp->rk);
nodata:
  if(auth_zone) {
    struct auth_rrset* soa = NULL;
    soa = auth_zone_get_soa_rrset(auth_zone);
    if(soa) {
      rsoa = make_soa_ubrrset(auth_zone, soa, temp);
      if(!rsoa) {
        verbose(VERB_ALGO, "rpz: local data action soa: out of memory");
        return;
      }
    }
  }

  rpz_local_encode(env, qinfo, edns, repinfo, buf, temp, rp,
    rrset_count, rcode, rsoa);
}

/** Apply the cname override action, during worker request callback.
 * false on failure. */
static int
rpz_apply_cname_override_action(struct rpz* r,
  struct query_info* qinfo, struct regional* temp)
{
  if(!r)
    return 0;
  qinfo->local_alias = regional_alloc_zero(temp,
    sizeof(struct local_rrset));
  if(qinfo->local_alias == NULL)
    return 0; /* out of memory */
  qinfo->local_alias->rrset = respip_copy_rrset(r->cname_override, temp);
  if(qinfo->local_alias->rrset == NULL) {
    qinfo->local_alias = NULL;
    return 0; /* out of memory */
  }
  qinfo->local_alias->rrset->rk.dname = qinfo->qname;
  qinfo->local_alias->rrset->rk.dname_len = qinfo->qname_len;
  return 1;
}

/** add additional section SOA record to the reply.
 * Since this gets fed into the normal iterator answer creation, it
 * gets minimal-responses applied to it, that can remove the additional SOA
 * again. */
static int
rpz_add_soa(struct reply_info* rep, struct module_qstate* ms,
  struct auth_zone* az)
{
  struct auth_rrset* soa = NULL;
  struct ub_packed_rrset_key* rsoa = NULL;
  struct ub_packed_rrset_key** prevrrsets;
  if(!az) return 1;
  soa = auth_zone_get_soa_rrset(az);
  if(!soa) return 1;
  if(!rep) return 0;
  rsoa = make_soa_ubrrset(az, soa, ms->region);
  if(!rsoa) return 0;
  prevrrsets = rep->rrsets;
  rep->rrsets = regional_alloc_zero(ms->region,
    sizeof(*rep->rrsets)*(rep->rrset_count+1));
  if(!rep->rrsets)
    return 0;
  if(prevrrsets && rep->rrset_count > 0)
    memcpy(rep->rrsets, prevrrsets, rep->rrset_count*sizeof(*rep->rrsets));
  rep->rrset_count++;
  rep->ar_numrrsets++;
  rep->rrsets[rep->rrset_count-1] = rsoa;
  return 1;
}

static inline struct dns_msg*
rpz_dns_msg_new(struct regional* region)
{
  struct dns_msg* msg =
      (struct dns_msg*)regional_alloc(region,
              sizeof(struct dns_msg));
  if(msg == NULL) { return NULL; }
  memset(msg, 0, sizeof(struct dns_msg));

  return msg;
}

static inline struct dns_msg*
rpz_synthesize_nodata(struct rpz* ATTR_UNUSED(r), struct module_qstate* ms,
  struct query_info* qinfo, struct auth_zone* az)
{
  struct dns_msg* msg = rpz_dns_msg_new(ms->region);
  if(msg == NULL) { return msg; }
  msg->qinfo = *qinfo;
  msg->rep = construct_reply_info_base(ms->region,
               LDNS_RCODE_NOERROR | BIT_QR | BIT_AA | BIT_RA,
               1, /* qd */
               0, /* ttl */
               0, /* prettl */
               0, /* expttl */
               0, /* norecttl */
               0, /* an */
               0, /* ns */
               0, /* ar */
               0, /* total */
               sec_status_insecure,
               LDNS_EDE_NONE);
  if(msg->rep)
    msg->rep->authoritative = 1;
  if(!rpz_add_soa(msg->rep, ms, az))
    return NULL;
  return msg;
}

static inline struct dns_msg*
rpz_synthesize_nxdomain(struct rpz* r, struct module_qstate* ms,
  struct query_info* qinfo, struct auth_zone* az)
{
  struct dns_msg* msg = rpz_dns_msg_new(ms->region);
  uint16_t flags;
  if(msg == NULL) { return msg; }
  msg->qinfo = *qinfo;
  flags = LDNS_RCODE_NXDOMAIN | BIT_QR | BIT_AA | BIT_RA;
  if(r->signal_nxdomain_ra)
    flags &= ~BIT_RA;
  msg->rep = construct_reply_info_base(ms->region,
               flags,
               1, /* qd */
               0, /* ttl */
               0, /* prettl */
               0, /* expttl */
               0, /* norecttl */
               0, /* an */
               0, /* ns */
               0, /* ar */
               0, /* total */
               sec_status_insecure,
               LDNS_EDE_NONE);
  if(msg->rep)
    msg->rep->authoritative = 1;
  if(!rpz_add_soa(msg->rep, ms, az))
    return NULL;
  return msg;
}

static inline struct dns_msg*
rpz_synthesize_localdata_from_rrset(struct rpz* ATTR_UNUSED(r), struct module_qstate* ms,
  struct query_info* qi, struct local_rrset* rrset, struct auth_zone* az)
{
  struct dns_msg* msg = NULL;
  struct reply_info* new_reply_info;
  struct ub_packed_rrset_key* rp;


  msg = rpz_dns_msg_new(ms->region);
  if(msg == NULL) { return NULL; }

  msg->qinfo = *qi;
        new_reply_info = construct_reply_info_base(ms->region,
                                                   LDNS_RCODE_NOERROR | BIT_QR | BIT_AA | BIT_RA,
                                                   1, /* qd */
                                                   0, /* ttl */
                                                   0, /* prettl */
                                                   0, /* expttl */
                                                   0, /* norecttl */
                                                   1, /* an */
                                                   0, /* ns */
                                                   0, /* ar */
                                                   1, /* total */
                                                   sec_status_insecure,
                                                   LDNS_EDE_NONE);
  if(new_reply_info == NULL) {
    log_err("out of memory");
    return NULL;
  }
  new_reply_info->authoritative = 1;
  rp = respip_copy_rrset(rrset->rrset, ms->region);
  if(rp == NULL) {
    log_err("out of memory");
    return NULL;
  }
  rp->rk.dname = qi->qname;
  rp->rk.dname_len = qi->qname_len;
  /* this rrset is from the rpz data, or synthesized.
   * It is not actually from the network, so we flag it with this
   * flags as a fake RRset. If later the cache is used to look up
   * rrsets, then the fake ones are not returned (if you look without
   * the flag). For like CNAME lookups from the iterator or A, AAAA
   * lookups for nameserver targets, it would use the without flag
   * actual data. So that the actual network data and fake data
   * are kept track of separately. */
  rp->rk.flags |= PACKED_RRSET_RPZ;
  new_reply_info->rrsets[0] = rp;
  msg->rep = new_reply_info;
  if(!rpz_add_soa(msg->rep, ms, az))
    return NULL;
  return msg;
}

static inline struct dns_msg*
rpz_synthesize_nsip_localdata(struct rpz* r, struct module_qstate* ms,
  struct query_info* qi, struct clientip_synthesized_rr* data,
  struct auth_zone* az)
{
  struct local_rrset* rrset;

  rrset = rpz_find_synthesized_rrset(qi->qtype, data, 1);
  if(rrset == NULL) {
    verbose(VERB_ALGO, "rpz: nsip: no matching local data found");
    return NULL;
  }

  return rpz_synthesize_localdata_from_rrset(r, ms, qi, rrset, az);
}

/* copy'n'paste from localzone.c */
static struct local_rrset*
local_data_find_type(struct local_data* data, uint16_t type, int alias_ok)
{
  struct local_rrset* p, *cname = NULL;
  type = htons(type);
  for(p = data->rrsets; p; p = p->next) {
    if(p->rrset->rk.type == type)
      return p;
    if(alias_ok && p->rrset->rk.type == htons(LDNS_RR_TYPE_CNAME))
      cname = p;
  }
  if(alias_ok)
    return cname;
  return NULL;
}

/* based on localzone.c:local_data_answer() */
static inline struct dns_msg*
rpz_synthesize_nsdname_localdata(struct rpz* r, struct module_qstate* ms,
  struct query_info* qi, struct local_zone* z,
  struct matched_delegation_point const* match, struct auth_zone* az)
{
  struct local_data key;
  struct local_data* ld;
  struct local_rrset* rrset;

  if(match->dname == NULL) { return NULL; }

  key.node.key = &key;
  key.name = match->dname;
  key.namelen = match->dname_len;
  key.namelabs = dname_count_labels(match->dname);

  rpz_log_dname("nsdname local data", key.name, key.namelen);

  ld = (struct local_data*)rbtree_search(&z->data, &key.node);
  if(ld == NULL) {
    verbose(VERB_ALGO, "rpz: nsdname: impossible: qname not found");
    return NULL;
  }

  rrset = local_data_find_type(ld, qi->qtype, 1);
  if(rrset == NULL) {
    verbose(VERB_ALGO, "rpz: nsdname: no matching local data found");
    return NULL;
  }

  return rpz_synthesize_localdata_from_rrset(r, ms, qi, rrset, az);
}

/* like local_data_answer for qname triggers after a cname */
static struct dns_msg*
rpz_synthesize_qname_localdata_msg(struct rpz* r, struct module_qstate* ms,
  struct query_info* qinfo, struct local_zone* z, struct auth_zone* az)
{
  struct local_data key;
  struct local_data* ld;
  struct local_rrset* rrset;
  key.node.key = &key;
  key.name = qinfo->qname;
  key.namelen = qinfo->qname_len;
  key.namelabs = dname_count_labels(qinfo->qname);
  ld = (struct local_data*)rbtree_search(&z->data, &key.node);
  if(ld == NULL) {
    verbose(VERB_ALGO, "rpz: qname: name not found");
    return NULL;
  }
  rrset = local_data_find_type(ld, qinfo->qtype, 1);
  if(rrset == NULL) {
    verbose(VERB_ALGO, "rpz: qname: type not found");
    return NULL;
  }
  return rpz_synthesize_localdata_from_rrset(r, ms, qinfo, rrset, az);
}

/** Synthesize a CNAME message for RPZ action override */
static struct dns_msg*
rpz_synthesize_cname_override_msg(struct rpz* r, struct module_qstate* ms,
  struct query_info* qinfo)
{
  struct dns_msg* msg = NULL;
  struct reply_info* new_reply_info;
  struct ub_packed_rrset_key* rp;

  msg = rpz_dns_msg_new(ms->region);
  if(msg == NULL) { return NULL; }

  msg->qinfo = *qinfo;
        new_reply_info = construct_reply_info_base(ms->region,
                                                   LDNS_RCODE_NOERROR | BIT_QR | BIT_AA | BIT_RA,
                                                   1, /* qd */
                                                   0, /* ttl */
                                                   0, /* prettl */
                                                   0, /* expttl */
                                                   0, /* norecttl */
                                                   1, /* an */
                                                   0, /* ns */
                                                   0, /* ar */
                                                   1, /* total */
                                                   sec_status_insecure,
                                                   LDNS_EDE_NONE);
  if(new_reply_info == NULL) {
    log_err("out of memory");
    return NULL;
  }
  new_reply_info->authoritative = 1;

  rp = respip_copy_rrset(r->cname_override, ms->region);
  if(rp == NULL) {
    log_err("out of memory");
    return NULL;
  }
  rp->rk.dname = qinfo->qname;
  rp->rk.dname_len = qinfo->qname_len;
  /* this rrset is from the rpz data, or synthesized.
   * It is not actually from the network, so we flag it with this
   * flags as a fake RRset. If later the cache is used to look up
   * rrsets, then the fake ones are not returned (if you look without
   * the flag). For like CNAME lookups from the iterator or A, AAAA
   * lookups for nameserver targets, it would use the without flag
   * actual data. So that the actual network data and fake data
   * are kept track of separately. */
  rp->rk.flags |= PACKED_RRSET_RPZ;
  new_reply_info->rrsets[0] = rp;

  msg->rep = new_reply_info;
  return msg;
}

static int
rpz_synthesize_qname_localdata(struct module_env* env, struct rpz* r,
  struct local_zone* z, enum localzone_type lzt, struct query_info* qinfo,
  struct edns_data* edns, sldns_buffer* buf, struct regional* temp,
  struct comm_reply* repinfo, struct ub_server_stats* stats)
{
  struct local_data* ld = NULL;
  int ret = 0;
  if(r->action_override == RPZ_CNAME_OVERRIDE_ACTION) {
    if(!rpz_apply_cname_override_action(r, qinfo, temp))
      return 0;
    if(r->log) {
      log_rpz_apply("qname", z->name, NULL, RPZ_CNAME_OVERRIDE_ACTION,
              qinfo, repinfo, NULL, r->log_name);
    }
    stats->rpz_action[RPZ_CNAME_OVERRIDE_ACTION]++;
    return 0;
  }

  if(lzt == local_zone_redirect && local_data_answer(z, env, qinfo,
    edns, repinfo, buf, temp, dname_count_labels(qinfo->qname),
    &ld, lzt, -1, NULL, 0, NULL, 0)) {
    if(r->log) {
      log_rpz_apply("qname", z->name, NULL,
        localzone_type_to_rpz_action(lzt), qinfo,
        repinfo, NULL, r->log_name);
    }
    stats->rpz_action[localzone_type_to_rpz_action(lzt)]++;
    return !qinfo->local_alias;
  }

  ret = local_zones_zone_answer(z, env, qinfo, edns, repinfo, buf, temp,
    0 /* no local data used */, lzt);
  if(r->signal_nxdomain_ra && LDNS_RCODE_WIRE(sldns_buffer_begin(buf))
    == LDNS_RCODE_NXDOMAIN)
    LDNS_RA_CLR(sldns_buffer_begin(buf));
  if(r->log) {
    log_rpz_apply("qname", z->name, NULL, localzone_type_to_rpz_action(lzt),
            qinfo, repinfo, NULL, r->log_name);
  }
  stats->rpz_action[localzone_type_to_rpz_action(lzt)]++;
  return ret;
}

static struct clientip_synthesized_rr*
rpz_delegation_point_ipbased_trigger_lookup(struct rpz* rpz, struct iter_qstate* is)
{
  struct delegpt_addr* cursor;
  struct clientip_synthesized_rr* action = NULL;
  if(is->dp == NULL) { return NULL; }
  for(cursor = is->dp->target_list;
      cursor != NULL;
      cursor = cursor->next_target) {
    if(cursor->bogus) { continue; }
    action = rpz_ipbased_trigger_lookup(rpz->ns_set, &cursor->addr,
                cursor->addrlen, "nsip");
    if(action != NULL) { return action; }
  }
  return NULL;
}

static struct dns_msg*
rpz_apply_nsip_trigger(struct module_qstate* ms, struct query_info* qchase,
  struct rpz* r, struct clientip_synthesized_rr* raddr,
  struct auth_zone* az)
{
  enum rpz_action action = raddr->action;
  struct dns_msg* ret = NULL;

  if(r->action_override != RPZ_NO_OVERRIDE_ACTION) {
    verbose(VERB_ALGO, "rpz: using override action=%s (replaces=%s)",
      rpz_action_to_string(r->action_override), rpz_action_to_string(action));
    action = r->action_override;
  }

  if(action == RPZ_LOCAL_DATA_ACTION && raddr->data == NULL) {
    verbose(VERB_ALGO, "rpz: bug: nsip local data action but no local data");
    ret = rpz_synthesize_nodata(r, ms, qchase, az);
    ms->rpz_applied = 1;
    goto done;
  }

  switch(action) {
  case RPZ_NXDOMAIN_ACTION:
    ret = rpz_synthesize_nxdomain(r, ms, qchase, az);
    ms->rpz_applied = 1;
    break;
  case RPZ_NODATA_ACTION:
    ret = rpz_synthesize_nodata(r, ms, qchase, az);
    ms->rpz_applied = 1;
    break;
  case RPZ_TCP_ONLY_ACTION:
    /* basically a passthru here but the tcp-only will be
     * honored before the query gets sent. */
    ms->tcp_required = 1;
    ret = NULL;
    break;
  case RPZ_DROP_ACTION:
    ret = rpz_synthesize_nodata(r, ms, qchase, az);
    ms->rpz_applied = 1;
    ms->is_drop = 1;
    break;
  case RPZ_LOCAL_DATA_ACTION:
    ret = rpz_synthesize_nsip_localdata(r, ms, qchase, raddr, az);
    if(ret == NULL) { ret = rpz_synthesize_nodata(r, ms, qchase, az); }
    ms->rpz_applied = 1;
    break;
  case RPZ_PASSTHRU_ACTION:
    ret = NULL;
    ms->rpz_passthru = 1;
    break;
  case RPZ_CNAME_OVERRIDE_ACTION:
    ret = rpz_synthesize_cname_override_msg(r, ms, qchase);
    ms->rpz_applied = 1;
    break;
  default:
    verbose(VERB_ALGO, "rpz: nsip: bug: unhandled or invalid action: '%s'",
      rpz_action_to_string(action));
    ret = NULL;
  }

done:
  if(r->log)
    log_rpz_apply("nsip", NULL, &raddr->node,
      action, &ms->qinfo, NULL, ms, r->log_name);
  if(ms->env->worker)
    ms->env->worker->stats.rpz_action[action]++;
  lock_rw_unlock(&raddr->lock);
  return ret;
}

static struct dns_msg*
rpz_apply_nsdname_trigger(struct module_qstate* ms, struct query_info* qchase,
  struct rpz* r, struct local_zone* z,
  struct matched_delegation_point const* match, struct auth_zone* az)
{
  struct dns_msg* ret = NULL;
  enum rpz_action action = localzone_type_to_rpz_action(z->type);

  if(r->action_override != RPZ_NO_OVERRIDE_ACTION) {
    verbose(VERB_ALGO, "rpz: using override action=%s (replaces=%s)",
      rpz_action_to_string(r->action_override), rpz_action_to_string(action));
    action = r->action_override;
  }

  switch(action) {
  case RPZ_NXDOMAIN_ACTION:
    ret = rpz_synthesize_nxdomain(r, ms, qchase, az);
    ms->rpz_applied = 1;
    break;
  case RPZ_NODATA_ACTION:
    ret = rpz_synthesize_nodata(r, ms, qchase, az);
    ms->rpz_applied = 1;
    break;
  case RPZ_TCP_ONLY_ACTION:
    /* basically a passthru here but the tcp-only will be
     * honored before the query gets sent. */
    ms->tcp_required = 1;
    ret = NULL;
    break;
  case RPZ_DROP_ACTION:
    ret = rpz_synthesize_nodata(r, ms, qchase, az);
    ms->rpz_applied = 1;
    ms->is_drop = 1;
    break;
  case RPZ_LOCAL_DATA_ACTION:
    ret = rpz_synthesize_nsdname_localdata(r, ms, qchase, z, match, az);
    if(ret == NULL) { ret = rpz_synthesize_nodata(r, ms, qchase, az); }
    ms->rpz_applied = 1;
    break;
  case RPZ_PASSTHRU_ACTION:
    ret = NULL;
    ms->rpz_passthru = 1;
    break;
  case RPZ_CNAME_OVERRIDE_ACTION:
    ret = rpz_synthesize_cname_override_msg(r, ms, qchase);
    ms->rpz_applied = 1;
    break;
  default:
    verbose(VERB_ALGO, "rpz: nsdname: bug: unhandled or invalid action: '%s'",
      rpz_action_to_string(action));
    ret = NULL;
  }

  if(r->log)
    log_rpz_apply("nsdname", match->dname, NULL,
      action, &ms->qinfo, NULL, ms, r->log_name);
  if(ms->env->worker)
    ms->env->worker->stats.rpz_action[action]++;
  lock_rw_unlock(&z->lock);
  return ret;
}

static struct local_zone*
rpz_delegation_point_zone_lookup(struct delegpt* dp, struct local_zones* zones,
  uint16_t qclass,
  /* output parameter */
  struct matched_delegation_point* match)
{
  struct delegpt_ns* nameserver;
  struct local_zone* z = NULL;

  /* the rpz specs match the nameserver names (NS records), not the
   * name of the delegation point itself, to the nsdname triggers */
  for(nameserver = dp->nslist;
      nameserver != NULL;
      nameserver = nameserver->next) {
    z = rpz_find_zone(zones, nameserver->name, nameserver->namelen,
          qclass, 0, 0, 0);
    if(z != NULL) {
      match->dname = nameserver->name;
      match->dname_len = nameserver->namelen;
      if(verbosity >= VERB_ALGO) {
        char nm[LDNS_MAX_DOMAINLEN];
        char zn[LDNS_MAX_DOMAINLEN];
        dname_str(match->dname, nm);
        dname_str(z->name, zn);
        if(strcmp(nm, zn) != 0)
          verbose(VERB_ALGO, "rpz: trigger nsdname %s on %s action=%s",
            zn, nm, rpz_action_to_string(localzone_type_to_rpz_action(z->type)));
        else
          verbose(VERB_ALGO, "rpz: trigger nsdname %s action=%s",
            nm, rpz_action_to_string(localzone_type_to_rpz_action(z->type)));
      }
      break;
    }
  }

  return z;
}

struct dns_msg*
rpz_callback_from_iterator_module(struct module_qstate* ms, struct iter_qstate* is)
{
  struct auth_zones* az;
  struct auth_zone* a;
  struct clientip_synthesized_rr* raddr = NULL;
  struct rpz* r = NULL;
  struct local_zone* z = NULL;
  struct matched_delegation_point match = {0};

  if(ms->rpz_passthru) {
    verbose(VERB_ALGO, "query is rpz_passthru, no further processing");
    return NULL;
  }

  if(ms->env == NULL || ms->env->auth_zones == NULL) { return 0; }

  az = ms->env->auth_zones;
  lock_rw_rdlock(&az->rpz_lock);

  verbose(VERB_ALGO, "rpz: iterator module callback: have_rpz=%d", az->rpz_first != NULL);

  /* precedence of RPZ works, loosely, like this:
   * CNAMEs in order of the CNAME chain. rpzs in the order they are
   * configured. In an RPZ: first client-IP addr, then QNAME, then
   * response IP, then NSDNAME, then NSIP. Longest match first. Smallest
   * one from a set. */
  /* we use the precedence rules for the topics and triggers that
   * are pertinent at this stage of the resolve processing */
  for(a = az->rpz_first; a != NULL; a = a->rpz_az_next) {
    lock_rw_rdlock(&a->lock);
    r = a->rpz;
    if(r->disabled) {
      lock_rw_unlock(&a->lock);
      continue;
    }
    if(r->taglist && (!ms->client_info ||
      !taglist_intersect(r->taglist, r->taglistlen,
        ms->client_info->taglist,
        ms->client_info->taglen))) {
      lock_rw_unlock(&a->lock);
      continue;
    }

    /* the nsdname has precedence over the nsip triggers */
    z = rpz_delegation_point_zone_lookup(is->dp, r->nsdname_zones,
                 is->qchase.qclass, &match);
    if(z != NULL) {
      lock_rw_unlock(&a->lock);
      break;
    }

    raddr = rpz_delegation_point_ipbased_trigger_lookup(r, is);
    if(raddr != NULL) {
      lock_rw_unlock(&a->lock);
      break;
    }
    lock_rw_unlock(&a->lock);
  }

  lock_rw_unlock(&az->rpz_lock);

  if(raddr == NULL && z == NULL)
    return NULL;

  if(raddr != NULL) {
    if(z) {
      lock_rw_unlock(&z->lock);
    }
    return rpz_apply_nsip_trigger(ms, &is->qchase, r, raddr, a);
  }
  return rpz_apply_nsdname_trigger(ms, &is->qchase, r, z, &match, a);
}

struct dns_msg* rpz_callback_from_iterator_cname(struct module_qstate* ms,
  struct iter_qstate* is)
{
  struct auth_zones* az;
  struct auth_zone* a = NULL;
  struct rpz* r = NULL;
  struct local_zone* z = NULL;
  enum localzone_type lzt;
  struct dns_msg* ret = NULL;

  if(ms->rpz_passthru) {
    verbose(VERB_ALGO, "query is rpz_passthru, no further processing");
    return NULL;
  }

  if(ms->env == NULL || ms->env->auth_zones == NULL) { return 0; }
  az = ms->env->auth_zones;

  lock_rw_rdlock(&az->rpz_lock);

  for(a = az->rpz_first; a; a = a->rpz_az_next) {
    lock_rw_rdlock(&a->lock);
    r = a->rpz;
    if(r->disabled) {
      lock_rw_unlock(&a->lock);
      continue;
    }
    if(r->taglist && (!ms->client_info ||
      !taglist_intersect(r->taglist, r->taglistlen,
        ms->client_info->taglist,
        ms->client_info->taglen))) {
      lock_rw_unlock(&a->lock);
      continue;
    }
    z = rpz_find_zone(r->local_zones, is->qchase.qname,
      is->qchase.qname_len, is->qchase.qclass, 0, 0, 0);
    if(z && r->action_override == RPZ_DISABLED_ACTION) {
      if(r->log)
        log_rpz_apply("qname", z->name, NULL,
          r->action_override,
          &ms->qinfo, NULL, ms, r->log_name);
      if(ms->env->worker)
        ms->env->worker->stats.rpz_action[r->action_override]++;
      lock_rw_unlock(&z->lock);
      z = NULL;
    }
    if(z) {
      break;
    }
    /* not found in this auth_zone */
    lock_rw_unlock(&a->lock);
  }
  lock_rw_unlock(&az->rpz_lock);

  if(z == NULL)
    return NULL;
  if(r->action_override == RPZ_NO_OVERRIDE_ACTION) {
    lzt = z->type;
  } else {
    lzt = rpz_action_to_localzone_type(r->action_override);
  }

  if(verbosity >= VERB_ALGO) {
    char nm[LDNS_MAX_DOMAINLEN], zn[LDNS_MAX_DOMAINLEN];
    dname_str(is->qchase.qname, nm);
    dname_str(z->name, zn);
    if(strcmp(zn, nm) != 0)
      verbose(VERB_ALGO, "rpz: qname trigger %s on %s, with action=%s",
        zn, nm, rpz_action_to_string(localzone_type_to_rpz_action(lzt)));
    else
      verbose(VERB_ALGO, "rpz: qname trigger %s, with action=%s",
        nm, rpz_action_to_string(localzone_type_to_rpz_action(lzt)));
  }
  switch(localzone_type_to_rpz_action(lzt)) {
  case RPZ_NXDOMAIN_ACTION:
    ret = rpz_synthesize_nxdomain(r, ms, &is->qchase, a);
    ms->rpz_applied = 1;
    break;
  case RPZ_NODATA_ACTION:
    ret = rpz_synthesize_nodata(r, ms, &is->qchase, a);
    ms->rpz_applied = 1;
    break;
  case RPZ_TCP_ONLY_ACTION:
    /* basically a passthru here but the tcp-only will be
     * honored before the query gets sent. */
    ms->tcp_required = 1;
    ret = NULL;
    break;
  case RPZ_DROP_ACTION:
    ret = rpz_synthesize_nodata(r, ms, &is->qchase, a);
    ms->rpz_applied = 1;
    ms->is_drop = 1;
    break;
  case RPZ_LOCAL_DATA_ACTION:
    ret = rpz_synthesize_qname_localdata_msg(r, ms, &is->qchase, z, a);
    if(ret == NULL) { ret = rpz_synthesize_nodata(r, ms, &is->qchase, a); }
    ms->rpz_applied = 1;
    break;
  case RPZ_PASSTHRU_ACTION:
    ret = NULL;
    ms->rpz_passthru = 1;
    break;
  default:
    verbose(VERB_ALGO, "rpz: qname trigger: bug: unhandled or invalid action: '%s'",
      rpz_action_to_string(localzone_type_to_rpz_action(lzt)));
    ret = NULL;
  }
  if(r->log)
    log_rpz_apply("qname", (z?z->name:NULL), NULL,
      localzone_type_to_rpz_action(lzt),
      &is->qchase, NULL, ms, r->log_name);
  lock_rw_unlock(&z->lock);
  lock_rw_unlock(&a->lock);
  return ret;
}

static int
rpz_apply_maybe_clientip_trigger(struct auth_zones* az, struct module_env* env,
  struct query_info* qinfo, struct edns_data* edns, struct comm_reply* repinfo,
  uint8_t* taglist, size_t taglen, struct ub_server_stats* stats,
  sldns_buffer* buf, struct regional* temp,
  /* output parameters */
  struct local_zone** z_out, struct auth_zone** a_out, struct rpz** r_out,
  int* passthru)
{
  int ret = 0;
  enum rpz_action client_action;
  struct clientip_synthesized_rr* node = rpz_resolve_client_action_and_zone(
    az, qinfo, repinfo, taglist, taglen, stats, z_out, a_out, r_out);

  client_action = ((node == NULL) ? RPZ_INVALID_ACTION : node->action);
  if(node != NULL && *r_out &&
    (*r_out)->action_override != RPZ_NO_OVERRIDE_ACTION) {
    client_action = (*r_out)->action_override;
  }
  if(client_action == RPZ_PASSTHRU_ACTION) {
    if(*r_out && (*r_out)->log)
      log_rpz_apply(
        (node?"clientip":"qname"),
        ((*z_out)?(*z_out)->name:NULL),
        (node?&node->node:NULL),
        client_action, qinfo, repinfo, NULL,
        (*r_out)->log_name);
    *passthru = 1;
    ret = 0;
    goto done;
  }
  if(*z_out == NULL || (client_action != RPZ_INVALID_ACTION &&
            client_action != RPZ_PASSTHRU_ACTION)) {
    if(client_action == RPZ_PASSTHRU_ACTION
      || client_action == RPZ_INVALID_ACTION
      || (client_action == RPZ_TCP_ONLY_ACTION
        && !rpz_is_udp_query(repinfo))) {
      ret = 0;
      goto done;
    }
    stats->rpz_action[client_action]++;
    if(client_action == RPZ_LOCAL_DATA_ACTION) {
      rpz_apply_clientip_localdata_action(node, env, qinfo,
        edns, repinfo, buf, temp, *a_out);
      ret = 1;
    } else if(client_action == RPZ_CNAME_OVERRIDE_ACTION) {
      if(!rpz_apply_cname_override_action(*r_out, qinfo,
        temp)) {
        ret = 0;
        goto done;
      }
      ret = 0;
    } else {
      local_zones_zone_answer(*z_out /*likely NULL, no zone*/, env, qinfo, edns,
        repinfo, buf, temp, 0 /* no local data used */,
        rpz_action_to_localzone_type(client_action));
      if(*r_out && (*r_out)->signal_nxdomain_ra &&
        LDNS_RCODE_WIRE(sldns_buffer_begin(buf))
        == LDNS_RCODE_NXDOMAIN)
        LDNS_RA_CLR(sldns_buffer_begin(buf));
      ret = 1;
    }
    if(*r_out && (*r_out)->log)
      log_rpz_apply(
        (node?"clientip":"qname"),
        ((*z_out)?(*z_out)->name:NULL),
        (node?&node->node:NULL),
        client_action, qinfo, repinfo, NULL,
        (*r_out)->log_name);
    goto done;
  }
  ret = -1;
done:
  if(node != NULL) {
    lock_rw_unlock(&node->lock);
  }
  return ret;
}

int
rpz_callback_from_worker_request(struct auth_zones* az, struct module_env* env,
  struct query_info* qinfo, struct edns_data* edns, sldns_buffer* buf,
  struct regional* temp, struct comm_reply* repinfo, uint8_t* taglist,
  size_t taglen, struct ub_server_stats* stats, int* passthru)
{
  struct rpz* r = NULL;
  struct auth_zone* a = NULL;
  struct local_zone* z = NULL;
  int ret;
  enum localzone_type lzt;

  int clientip_trigger = rpz_apply_maybe_clientip_trigger(az, env, qinfo,
    edns, repinfo, taglist, taglen, stats, buf, temp, &z, &a, &r,
    passthru);
  if(clientip_trigger >= 0) {
    if(a) {
      lock_rw_unlock(&a->lock);
    }
    if(z) {
      lock_rw_unlock(&z->lock);
    }
    return clientip_trigger;
  }

  if(z == NULL) {
    if(a) {
      lock_rw_unlock(&a->lock);
    }
    return 0;
  }

  log_assert(r);

  if(r->action_override == RPZ_NO_OVERRIDE_ACTION) {
    lzt = z->type;
  } else {
    lzt = rpz_action_to_localzone_type(r->action_override);
  }
  if(r->action_override == RPZ_PASSTHRU_ACTION ||
    lzt == local_zone_always_transparent /* RPZ_PASSTHRU_ACTION */) {
    *passthru = 1;
  }

  if(verbosity >= VERB_ALGO) {
    char nm[LDNS_MAX_DOMAINLEN], zn[LDNS_MAX_DOMAINLEN];
    dname_str(qinfo->qname, nm);
    dname_str(z->name, zn);
    if(strcmp(zn, nm) != 0)
      verbose(VERB_ALGO, "rpz: qname trigger %s on %s with action=%s",
        zn, nm, rpz_action_to_string(localzone_type_to_rpz_action(lzt)));
    else
      verbose(VERB_ALGO, "rpz: qname trigger %s with action=%s",
        nm, rpz_action_to_string(localzone_type_to_rpz_action(lzt)));
  }

  ret = rpz_synthesize_qname_localdata(env, r, z, lzt, qinfo, edns, buf, temp,
               repinfo, stats);

  lock_rw_unlock(&z->lock);
  lock_rw_unlock(&a->lock);

  return ret;
}

void rpz_enable(struct rpz* r)
{
    if(!r)
        return;
    r->disabled = 0;
}

void rpz_disable(struct rpz* r)
{
    if(!r)
        return;
    r->disabled = 1;
}

/** Get memory usage for clientip_synthesized_rrset. Ignores memory usage
 * of locks. */
static size_t
rpz_clientip_synthesized_set_get_mem(struct clientip_synthesized_rrset* set)
{
  size_t m = sizeof(*set);
  lock_rw_rdlock(&set->lock);
  m += regional_get_mem(set->region);
  lock_rw_unlock(&set->lock);
  return m;
}

size_t rpz_get_mem(struct rpz* r)
{
  size_t m = sizeof(*r);
  if(r->taglist)
    m += r->taglistlen;
  if(r->log_name)
    m += strlen(r->log_name) + 1;
  m += regional_get_mem(r->region);
  m += local_zones_get_mem(r->local_zones);
  m += local_zones_get_mem(r->nsdname_zones);
  m += respip_set_get_mem(r->respip_set);
  m += rpz_clientip_synthesized_set_get_mem(r->client_set);
  m += rpz_clientip_synthesized_set_get_mem(r->ns_set);
  return m;
}

Coverage Report

Created: 2025-07-11 06:09