/* * services/localzone.c - local zones authority service. * * Copyright (c) 2007, 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 local zone authority service. */ #include "config.h" #include "services/localzone.h" #include "sldns/str2wire.h" #include "sldns/sbuffer.h" #include "util/regional.h" #include "util/config_file.h" #include "util/data/dname.h" #include "util/data/packed_rrset.h" #include "util/data/msgencode.h" #include "util/net_help.h" #include "util/netevent.h" #include "util/data/msgreply.h" #include "util/data/msgparse.h" #include "util/as112.h" struct local_zones* local_zones_create(void) { struct local_zones* zones = (struct local_zones*)calloc(1, sizeof(*zones)); if(!zones) return NULL; rbtree_init(&zones->ztree, &local_zone_cmp); lock_rw_init(&zones->lock); lock_protect(&zones->lock, &zones->ztree, sizeof(zones->ztree)); /* also lock protects the rbnode's in struct local_zone */ return zones; } /** helper traverse to delete zones */ static void lzdel(rbnode_t* n, void* ATTR_UNUSED(arg)) { struct local_zone* z = (struct local_zone*)n->key; local_zone_delete(z); } void local_zones_delete(struct local_zones* zones) { if(!zones) return; lock_rw_destroy(&zones->lock); /* walk through zones and delete them all */ traverse_postorder(&zones->ztree, lzdel, NULL); free(zones); } void local_zone_delete(struct local_zone* z) { if(!z) return; lock_rw_destroy(&z->lock); regional_destroy(z->region); free(z->name); free(z); } int local_zone_cmp(const void* z1, const void* z2) { /* first sort on class, so that hierarchy can be maintained within * a class */ struct local_zone* a = (struct local_zone*)z1; struct local_zone* b = (struct local_zone*)z2; int m; if(a->dclass != b->dclass) { if(a->dclass < b->dclass) return -1; return 1; } return dname_lab_cmp(a->name, a->namelabs, b->name, b->namelabs, &m); } int local_data_cmp(const void* d1, const void* d2) { struct local_data* a = (struct local_data*)d1; struct local_data* b = (struct local_data*)d2; int m; return dname_canon_lab_cmp(a->name, a->namelabs, b->name, b->namelabs, &m); } /* form wireformat from text format domain name */ int parse_dname(const char* str, uint8_t** res, size_t* len, int* labs) { *res = sldns_str2wire_dname(str, len); *labs = 0; if(!*res) { log_err("cannot parse name %s", str); return 0; } *labs = dname_count_size_labels(*res, len); return 1; } /** create a new localzone */ static struct local_zone* local_zone_create(uint8_t* nm, size_t len, int labs, enum localzone_type t, uint16_t dclass) { struct local_zone* z = (struct local_zone*)calloc(1, sizeof(*z)); if(!z) { return NULL; } z->node.key = z; z->dclass = dclass; z->type = t; z->name = nm; z->namelen = len; z->namelabs = labs; lock_rw_init(&z->lock); z->region = regional_create(); if(!z->region) { free(z); return NULL; } rbtree_init(&z->data, &local_data_cmp); lock_protect(&z->lock, &z->parent, sizeof(*z)-sizeof(rbnode_t)); /* also the zones->lock protects node, parent, name*, class */ return z; } /** enter a new zone with allocated dname returns with WRlock */ static struct local_zone* lz_enter_zone_dname(struct local_zones* zones, uint8_t* nm, size_t len, int labs, enum localzone_type t, uint16_t c) { struct local_zone* z = local_zone_create(nm, len, labs, t, c); if(!z) { log_err("out of memory"); return NULL; } /* add to rbtree */ lock_rw_wrlock(&zones->lock); lock_rw_wrlock(&z->lock); if(!rbtree_insert(&zones->ztree, &z->node)) { log_warn("duplicate local-zone"); lock_rw_unlock(&z->lock); local_zone_delete(z); lock_rw_unlock(&zones->lock); return NULL; } lock_rw_unlock(&zones->lock); return z; } /** enter a new zone */ static struct local_zone* lz_enter_zone(struct local_zones* zones, const char* name, const char* type, uint16_t dclass) { struct local_zone* z; enum localzone_type t; uint8_t* nm; size_t len; int labs; if(!parse_dname(name, &nm, &len, &labs)) { log_err("bad zone name %s %s", name, type); return NULL; } if(!local_zone_str2type(type, &t)) { log_err("bad lz_enter_zone type %s %s", name, type); free(nm); return NULL; } if(!(z=lz_enter_zone_dname(zones, nm, len, labs, t, dclass))) { log_err("could not enter zone %s %s", name, type); return NULL; } return z; } /** return name and class and rdata of rr; parses string */ static int get_rr_content(const char* str, uint8_t** nm, uint16_t* type, uint16_t* dclass, time_t* ttl, uint8_t* rr, size_t len, uint8_t** rdata, size_t* rdata_len) { size_t dname_len = 0; int e = sldns_str2wire_rr_buf(str, rr, &len, &dname_len, 3600, NULL, 0, NULL, 0); if(e) { log_err("error parsing local-data at %d: '%s': %s", LDNS_WIREPARSE_OFFSET(e), str, sldns_get_errorstr_parse(e)); return 0; } *nm = memdup(rr, dname_len); if(!*nm) { log_err("out of memory"); return 0; } *dclass = sldns_wirerr_get_class(rr, len, dname_len); *type = sldns_wirerr_get_type(rr, len, dname_len); *ttl = (time_t)sldns_wirerr_get_ttl(rr, len, dname_len); *rdata = sldns_wirerr_get_rdatawl(rr, len, dname_len); *rdata_len = sldns_wirerr_get_rdatalen(rr, len, dname_len)+2; return 1; } /** return name and class of rr; parses string */ static int get_rr_nameclass(const char* str, uint8_t** nm, uint16_t* dclass) { uint8_t rr[LDNS_RR_BUF_SIZE]; size_t len = sizeof(rr), dname_len = 0; int s = sldns_str2wire_rr_buf(str, rr, &len, &dname_len, 3600, NULL, 0, NULL, 0); if(s != 0) { log_err("error parsing local-data at %d '%s': %s", LDNS_WIREPARSE_OFFSET(s), str, sldns_get_errorstr_parse(s)); return 0; } *nm = memdup(rr, dname_len); *dclass = sldns_wirerr_get_class(rr, len, dname_len); if(!*nm) { log_err("out of memory"); return 0; } return 1; } /** * Find an rrset in local data structure. * @param data: local data domain name structure. * @param type: type to look for (host order). * @return rrset pointer or NULL if not found. */ static struct local_rrset* local_data_find_type(struct local_data* data, uint16_t type) { struct local_rrset* p; type = htons(type); for(p = data->rrsets; p; p = p->next) { if(p->rrset->rk.type == type) return p; } return NULL; } /** check for RR duplicates */ static int rr_is_duplicate(struct packed_rrset_data* pd, uint8_t* rdata, size_t rdata_len) { size_t i; for(i=0; icount; i++) { if(pd->rr_len[i] == rdata_len && memcmp(pd->rr_data[i], rdata, rdata_len) == 0) return 1; } return 0; } /** new local_rrset */ static struct local_rrset* new_local_rrset(struct regional* region, struct local_data* node, 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) { log_err("out of memory"); return NULL; } rrset->next = node->rrsets; node->rrsets = rrset; rrset->rrset = (struct ub_packed_rrset_key*) regional_alloc_zero(region, sizeof(*rrset->rrset)); if(!rrset->rrset) { 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) { 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.dname = node->name; rrset->rrset->rk.dname_len = node->namelen; rrset->rrset->rk.type = htons(rrtype); rrset->rrset->rk.rrset_class = htons(rrclass); return rrset; } /** insert RR into RRset data structure; Wastes a couple of bytes */ static int insert_rr(struct regional* region, struct packed_rrset_data* pd, uint8_t* rdata, size_t rdata_len, time_t ttl) { size_t* oldlen = pd->rr_len; time_t* oldttl = pd->rr_ttl; uint8_t** olddata = pd->rr_data; /* add RR to rrset */ pd->count++; pd->rr_len = regional_alloc(region, sizeof(*pd->rr_len)*pd->count); pd->rr_ttl = regional_alloc(region, sizeof(*pd->rr_ttl)*pd->count); pd->rr_data = regional_alloc(region, sizeof(*pd->rr_data)*pd->count); if(!pd->rr_len || !pd->rr_ttl || !pd->rr_data) { log_err("out of memory"); return 0; } if(pd->count > 1) { memcpy(pd->rr_len+1, oldlen, sizeof(*pd->rr_len)*(pd->count-1)); memcpy(pd->rr_ttl+1, oldttl, sizeof(*pd->rr_ttl)*(pd->count-1)); memcpy(pd->rr_data+1, olddata, sizeof(*pd->rr_data)*(pd->count-1)); } pd->rr_len[0] = rdata_len; pd->rr_ttl[0] = ttl; pd->rr_data[0] = regional_alloc_init(region, rdata, rdata_len); if(!pd->rr_data[0]) { log_err("out of memory"); return 0; } return 1; } /** find a data node by exact name */ static struct local_data* lz_find_node(struct local_zone* z, uint8_t* nm, size_t nmlen, int nmlabs) { struct local_data key; key.node.key = &key; key.name = nm; key.namelen = nmlen; key.namelabs = nmlabs; return (struct local_data*)rbtree_search(&z->data, &key.node); } /** find a node, create it if not and all its empty nonterminal parents */ static int lz_find_create_node(struct local_zone* z, uint8_t* nm, size_t nmlen, int nmlabs, struct local_data** res) { struct local_data* ld = lz_find_node(z, nm, nmlen, nmlabs); if(!ld) { /* create a domain name to store rr. */ ld = (struct local_data*)regional_alloc_zero(z->region, sizeof(*ld)); if(!ld) { log_err("out of memory adding local data"); return 0; } ld->node.key = ld; ld->name = regional_alloc_init(z->region, nm, nmlen); if(!ld->name) { log_err("out of memory"); return 0; } ld->namelen = nmlen; ld->namelabs = nmlabs; if(!rbtree_insert(&z->data, &ld->node)) { log_assert(0); /* duplicate name */ } /* see if empty nonterminals need to be created */ if(nmlabs > z->namelabs) { dname_remove_label(&nm, &nmlen); if(!lz_find_create_node(z, nm, nmlen, nmlabs-1, res)) return 0; } } *res = ld; return 1; } /** enter data RR into auth zone */ static int lz_enter_rr_into_zone(struct local_zone* z, const char* rrstr) { uint8_t* nm; size_t nmlen; int nmlabs; struct local_data* node; struct local_rrset* rrset; struct packed_rrset_data* pd; uint16_t rrtype = 0, rrclass = 0; time_t ttl = 0; uint8_t rr[LDNS_RR_BUF_SIZE]; uint8_t* rdata; size_t rdata_len; if(!get_rr_content(rrstr, &nm, &rrtype, &rrclass, &ttl, rr, sizeof(rr), &rdata, &rdata_len)) { log_err("bad local-data: %s", rrstr); return 0; } log_assert(z->dclass == rrclass); if(z->type == local_zone_redirect && query_dname_compare(z->name, nm) != 0) { log_err("local-data in redirect zone must reside at top of zone" ", not at %s", rrstr); free(nm); return 0; } nmlabs = dname_count_size_labels(nm, &nmlen); if(!lz_find_create_node(z, nm, nmlen, nmlabs, &node)) { free(nm); return 0; } log_assert(node); free(nm); rrset = local_data_find_type(node, rrtype); if(!rrset) { rrset = new_local_rrset(z->region, node, rrtype, rrclass); if(!rrset) return 0; if(query_dname_compare(node->name, z->name) == 0) { if(rrtype == LDNS_RR_TYPE_NSEC) rrset->rrset->rk.flags = PACKED_RRSET_NSEC_AT_APEX; if(rrtype == LDNS_RR_TYPE_SOA) z->soa = rrset->rrset; } } pd = (struct packed_rrset_data*)rrset->rrset->entry.data; log_assert(rrset && pd); /* check for duplicate RR */ if(rr_is_duplicate(pd, rdata, rdata_len)) { verbose(VERB_ALGO, "ignoring duplicate RR: %s", rrstr); return 1; } return insert_rr(z->region, pd, rdata, rdata_len, ttl); } /** enter a data RR into auth data; a zone for it must exist */ static int lz_enter_rr_str(struct local_zones* zones, const char* rr) { uint8_t* rr_name; uint16_t rr_class; size_t len; int labs; struct local_zone* z; int r; if(!get_rr_nameclass(rr, &rr_name, &rr_class)) { log_err("bad rr %s", rr); return 0; } labs = dname_count_size_labels(rr_name, &len); lock_rw_rdlock(&zones->lock); z = local_zones_lookup(zones, rr_name, len, labs, rr_class); if(!z) { lock_rw_unlock(&zones->lock); fatal_exit("internal error: no zone for rr %s", rr); } lock_rw_wrlock(&z->lock); lock_rw_unlock(&zones->lock); free(rr_name); r = lz_enter_rr_into_zone(z, rr); lock_rw_unlock(&z->lock); return r; } /** parse local-zone: statements */ static int lz_enter_zones(struct local_zones* zones, struct config_file* cfg) { struct config_str2list* p; struct local_zone* z; for(p = cfg->local_zones; p; p = p->next) { if(!(z=lz_enter_zone(zones, p->str, p->str2, LDNS_RR_CLASS_IN))) return 0; lock_rw_unlock(&z->lock); } return 1; } /** lookup a zone in rbtree; exact match only; SLOW due to parse */ static int lz_exists(struct local_zones* zones, const char* name) { struct local_zone z; z.node.key = &z; z.dclass = LDNS_RR_CLASS_IN; if(!parse_dname(name, &z.name, &z.namelen, &z.namelabs)) { log_err("bad name %s", name); return 0; } lock_rw_rdlock(&zones->lock); if(rbtree_search(&zones->ztree, &z.node)) { lock_rw_unlock(&zones->lock); free(z.name); return 1; } lock_rw_unlock(&zones->lock); free(z.name); return 0; } /** lookup a zone in cfg->nodefault list */ static int lz_nodefault(struct config_file* cfg, const char* name) { struct config_strlist* p; size_t len = strlen(name); if(len == 0) return 0; if(name[len-1] == '.') len--; for(p = cfg->local_zones_nodefault; p; p = p->next) { /* compare zone name, lowercase, compare without ending . */ if(strncasecmp(p->str, name, len) == 0 && (strlen(p->str) == len || (strlen(p->str)==len+1 && p->str[len] == '.'))) return 1; } return 0; } /** enter AS112 default zone */ static int add_as112_default(struct local_zones* zones, struct config_file* cfg, const char* name) { struct local_zone* z; char str[1024]; /* known long enough */ if(lz_exists(zones, name) || lz_nodefault(cfg, name)) return 1; /* do not enter default content */ if(!(z=lz_enter_zone(zones, name, "static", LDNS_RR_CLASS_IN))) return 0; snprintf(str, sizeof(str), "%s 10800 IN SOA localhost. " "nobody.invalid. 1 3600 1200 604800 10800", name); if(!lz_enter_rr_into_zone(z, str)) { lock_rw_unlock(&z->lock); return 0; } snprintf(str, sizeof(str), "%s 10800 IN NS localhost. ", name); if(!lz_enter_rr_into_zone(z, str)) { lock_rw_unlock(&z->lock); return 0; } lock_rw_unlock(&z->lock); return 1; } /** enter default zones */ static int lz_enter_defaults(struct local_zones* zones, struct config_file* cfg) { struct local_zone* z; const char** zstr; /* this list of zones is from RFC 6303 and RFC 7686 */ /* block localhost level zones first, then onion and later the LAN zones */ /* localhost. zone */ if(!lz_exists(zones, "localhost.") && !lz_nodefault(cfg, "localhost.")) { if(!(z=lz_enter_zone(zones, "localhost.", "static", LDNS_RR_CLASS_IN)) || !lz_enter_rr_into_zone(z, "localhost. 10800 IN NS localhost.") || !lz_enter_rr_into_zone(z, "localhost. 10800 IN SOA localhost. nobody.invalid. " "1 3600 1200 604800 10800") || !lz_enter_rr_into_zone(z, "localhost. 10800 IN A 127.0.0.1") || !lz_enter_rr_into_zone(z, "localhost. 10800 IN AAAA ::1")) { log_err("out of memory adding default zone"); if(z) { lock_rw_unlock(&z->lock); } return 0; } lock_rw_unlock(&z->lock); } /* reverse ip4 zone */ if(!lz_exists(zones, "127.in-addr.arpa.") && !lz_nodefault(cfg, "127.in-addr.arpa.")) { if(!(z=lz_enter_zone(zones, "127.in-addr.arpa.", "static", LDNS_RR_CLASS_IN)) || !lz_enter_rr_into_zone(z, "127.in-addr.arpa. 10800 IN NS localhost.") || !lz_enter_rr_into_zone(z, "127.in-addr.arpa. 10800 IN SOA localhost. " "nobody.invalid. 1 3600 1200 604800 10800") || !lz_enter_rr_into_zone(z, "1.0.0.127.in-addr.arpa. 10800 IN PTR localhost.")) { log_err("out of memory adding default zone"); if(z) { lock_rw_unlock(&z->lock); } return 0; } lock_rw_unlock(&z->lock); } /* reverse ip6 zone */ if(!lz_exists(zones, "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.") && !lz_nodefault(cfg, "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.")) { if(!(z=lz_enter_zone(zones, "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.", "static", LDNS_RR_CLASS_IN)) || !lz_enter_rr_into_zone(z, "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa. 10800 IN NS localhost.") || !lz_enter_rr_into_zone(z, "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa. 10800 IN SOA localhost. " "nobody.invalid. 1 3600 1200 604800 10800") || !lz_enter_rr_into_zone(z, "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa. 10800 IN PTR localhost.")) { log_err("out of memory adding default zone"); if(z) { lock_rw_unlock(&z->lock); } return 0; } lock_rw_unlock(&z->lock); } /* onion. zone (RFC 7686) */ if(!lz_exists(zones, "onion.") && !lz_nodefault(cfg, "onion.")) { if(!(z=lz_enter_zone(zones, "onion.", "static", LDNS_RR_CLASS_IN)) || !lz_enter_rr_into_zone(z, "onion. 10800 IN NS localhost.") || !lz_enter_rr_into_zone(z, "onion. 10800 IN SOA localhost. nobody.invalid. " "1 3600 1200 604800 10800")) { log_err("out of memory adding default zone"); if(z) { lock_rw_unlock(&z->lock); } return 0; } lock_rw_unlock(&z->lock); } /* block AS112 zones, unless asked not to */ if(!cfg->unblock_lan_zones) { for(zstr = as112_zones; *zstr; zstr++) { if(!add_as112_default(zones, cfg, *zstr)) { log_err("out of memory adding default zone"); return 0; } } } return 1; } /** setup parent pointers, so that a lookup can be done for closest match */ static void init_parents(struct local_zones* zones) { struct local_zone* node, *prev = NULL, *p; int m; lock_rw_wrlock(&zones->lock); RBTREE_FOR(node, struct local_zone*, &zones->ztree) { lock_rw_wrlock(&node->lock); node->parent = NULL; if(!prev || prev->dclass != node->dclass) { prev = node; lock_rw_unlock(&node->lock); continue; } (void)dname_lab_cmp(prev->name, prev->namelabs, node->name, node->namelabs, &m); /* we know prev is smaller */ /* sort order like: . com. bla.com. zwb.com. net. */ /* find the previous, or parent-parent-parent */ for(p = prev; p; p = p->parent) /* looking for name with few labels, a parent */ if(p->namelabs <= m) { /* ==: since prev matched m, this is closest*/ /* <: prev matches more, but is not a parent, * this one is a (grand)parent */ node->parent = p; break; } prev = node; lock_rw_unlock(&node->lock); } lock_rw_unlock(&zones->lock); } /** enter implicit transparent zone for local-data: without local-zone: */ static int lz_setup_implicit(struct local_zones* zones, struct config_file* cfg) { /* walk over all items that have no parent zone and find * the name that covers them all (could be the root) and * add that as a transparent zone */ struct config_strlist* p; int have_name = 0; int have_other_classes = 0; uint16_t dclass = 0; uint8_t* nm = 0; size_t nmlen = 0; int nmlabs = 0; int match = 0; /* number of labels match count */ init_parents(zones); /* to enable local_zones_lookup() */ for(p = cfg->local_data; p; p = p->next) { uint8_t* rr_name; uint16_t rr_class; size_t len; int labs; if(!get_rr_nameclass(p->str, &rr_name, &rr_class)) { log_err("Bad local-data RR %s", p->str); return 0; } labs = dname_count_size_labels(rr_name, &len); lock_rw_rdlock(&zones->lock); if(!local_zones_lookup(zones, rr_name, len, labs, rr_class)) { if(!have_name) { dclass = rr_class; nm = rr_name; nmlen = len; nmlabs = labs; match = labs; have_name = 1; } else { int m; if(rr_class != dclass) { /* process other classes later */ free(rr_name); have_other_classes = 1; lock_rw_unlock(&zones->lock); continue; } /* find smallest shared topdomain */ (void)dname_lab_cmp(nm, nmlabs, rr_name, labs, &m); free(rr_name); if(m < match) match = m; } } else free(rr_name); lock_rw_unlock(&zones->lock); } if(have_name) { uint8_t* n2; struct local_zone* z; /* allocate zone of smallest shared topdomain to contain em */ n2 = nm; dname_remove_labels(&n2, &nmlen, nmlabs - match); n2 = memdup(n2, nmlen); free(nm); if(!n2) { log_err("out of memory"); return 0; } log_nametypeclass(VERB_ALGO, "implicit transparent local-zone", n2, 0, dclass); if(!(z=lz_enter_zone_dname(zones, n2, nmlen, match, local_zone_transparent, dclass))) { return 0; } lock_rw_unlock(&z->lock); } if(have_other_classes) { /* restart to setup other class */ return lz_setup_implicit(zones, cfg); } return 1; } /** enter auth data */ static int lz_enter_data(struct local_zones* zones, struct config_file* cfg) { struct config_strlist* p; for(p = cfg->local_data; p; p = p->next) { if(!lz_enter_rr_str(zones, p->str)) return 0; } return 1; } /** free memory from config */ static void lz_freeup_cfg(struct config_file* cfg) { config_deldblstrlist(cfg->local_zones); cfg->local_zones = NULL; config_delstrlist(cfg->local_zones_nodefault); cfg->local_zones_nodefault = NULL; config_delstrlist(cfg->local_data); cfg->local_data = NULL; } int local_zones_apply_cfg(struct local_zones* zones, struct config_file* cfg) { /* create zones from zone statements. */ if(!lz_enter_zones(zones, cfg)) { return 0; } /* apply default zones+content (unless disabled, or overridden) */ if(!lz_enter_defaults(zones, cfg)) { return 0; } /* create implicit transparent zone from data. */ if(!lz_setup_implicit(zones, cfg)) { return 0; } /* setup parent ptrs for lookup during data entry */ init_parents(zones); /* insert local data */ if(!lz_enter_data(zones, cfg)) { return 0; } /* freeup memory from cfg struct. */ lz_freeup_cfg(cfg); return 1; } struct local_zone* local_zones_lookup(struct local_zones* zones, uint8_t* name, size_t len, int labs, uint16_t dclass) { rbnode_t* res = NULL; struct local_zone *result; struct local_zone key; key.node.key = &key; key.dclass = dclass; key.name = name; key.namelen = len; key.namelabs = labs; if(rbtree_find_less_equal(&zones->ztree, &key, &res)) { /* exact */ return (struct local_zone*)res; } else { /* smaller element (or no element) */ int m; result = (struct local_zone*)res; if(!result || result->dclass != dclass) return NULL; /* count number of labels matched */ (void)dname_lab_cmp(result->name, result->namelabs, key.name, key.namelabs, &m); while(result) { /* go up until qname is subdomain of zone */ if(result->namelabs <= m) break; result = result->parent; } return result; } } struct local_zone* local_zones_find(struct local_zones* zones, uint8_t* name, size_t len, int labs, uint16_t dclass) { struct local_zone key; key.node.key = &key; key.dclass = dclass; key.name = name; key.namelen = len; key.namelabs = labs; /* exact */ return (struct local_zone*)rbtree_search(&zones->ztree, &key); } /** print all RRsets in local zone */ static void local_zone_out(struct local_zone* z) { struct local_data* d; struct local_rrset* p; RBTREE_FOR(d, struct local_data*, &z->data) { for(p = d->rrsets; p; p = p->next) { log_nametypeclass(0, "rrset", d->name, ntohs(p->rrset->rk.type), ntohs(p->rrset->rk.rrset_class)); } } } void local_zones_print(struct local_zones* zones) { struct local_zone* z; lock_rw_rdlock(&zones->lock); log_info("number of auth zones %u", (unsigned)zones->ztree.count); RBTREE_FOR(z, struct local_zone*, &zones->ztree) { lock_rw_rdlock(&z->lock); switch(z->type) { case local_zone_deny: log_nametypeclass(0, "deny zone", z->name, 0, z->dclass); break; case local_zone_refuse: log_nametypeclass(0, "refuse zone", z->name, 0, z->dclass); break; case local_zone_redirect: log_nametypeclass(0, "redirect zone", z->name, 0, z->dclass); break; case local_zone_transparent: log_nametypeclass(0, "transparent zone", z->name, 0, z->dclass); break; case local_zone_typetransparent: log_nametypeclass(0, "typetransparent zone", z->name, 0, z->dclass); break; case local_zone_static: log_nametypeclass(0, "static zone", z->name, 0, z->dclass); break; case local_zone_inform: log_nametypeclass(0, "inform zone", z->name, 0, z->dclass); break; case local_zone_inform_deny: log_nametypeclass(0, "inform_deny zone", z->name, 0, z->dclass); break; default: log_nametypeclass(0, "badtyped zone", z->name, 0, z->dclass); break; } local_zone_out(z); lock_rw_unlock(&z->lock); } lock_rw_unlock(&zones->lock); } /** encode answer consisting of 1 rrset */ static int local_encode(struct query_info* qinfo, struct edns_data* edns, sldns_buffer* buf, struct regional* temp, struct ub_packed_rrset_key* rrset, int ansec, int rcode) { struct reply_info rep; uint16_t udpsize; /* make answer with time=0 for fixed TTL values */ memset(&rep, 0, sizeof(rep)); rep.flags = (uint16_t)((BIT_QR | BIT_AA | BIT_RA) | rcode); rep.qdcount = 1; if(ansec) rep.an_numrrsets = 1; else rep.ns_numrrsets = 1; rep.rrset_count = 1; rep.rrsets = &rrset; 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(!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; } /** answer local data match */ static int local_data_answer(struct local_zone* z, struct query_info* qinfo, struct edns_data* edns, sldns_buffer* buf, struct regional* temp, int labs, struct local_data** ldp) { struct local_data key; struct local_data* ld; struct local_rrset* lr; key.node.key = &key; key.name = qinfo->qname; key.namelen = qinfo->qname_len; key.namelabs = labs; if(z->type == local_zone_redirect) { key.name = z->name; key.namelen = z->namelen; key.namelabs = z->namelabs; } ld = (struct local_data*)rbtree_search(&z->data, &key.node); *ldp = ld; if(!ld) { return 0; } lr = local_data_find_type(ld, qinfo->qtype); if(!lr) return 0; if(z->type == local_zone_redirect) { /* convert rrset name to query name; like a wildcard */ struct ub_packed_rrset_key r = *lr->rrset; r.rk.dname = qinfo->qname; r.rk.dname_len = qinfo->qname_len; return local_encode(qinfo, edns, buf, temp, &r, 1, LDNS_RCODE_NOERROR); } return local_encode(qinfo, edns, buf, temp, lr->rrset, 1, LDNS_RCODE_NOERROR); } /** * answer in case where no exact match is found * @param z: zone for query * @param qinfo: query * @param edns: edns from query * @param buf: buffer for answer. * @param temp: temp region for encoding * @param ld: local data, if NULL, no such name exists in localdata. * @return 1 if a reply is to be sent, 0 if not. */ static int lz_zone_answer(struct local_zone* z, struct query_info* qinfo, struct edns_data* edns, sldns_buffer* buf, struct regional* temp, struct local_data* ld) { if(z->type == local_zone_deny || z->type == local_zone_inform_deny) { /** no reply at all, signal caller by clearing buffer. */ sldns_buffer_clear(buf); sldns_buffer_flip(buf); return 1; } else if(z->type == local_zone_refuse) { error_encode(buf, (LDNS_RCODE_REFUSED|BIT_AA), qinfo, *(uint16_t*)sldns_buffer_begin(buf), sldns_buffer_read_u16_at(buf, 2), edns); return 1; } else if(z->type == local_zone_static || z->type == local_zone_redirect) { /* for static, reply nodata or nxdomain * for redirect, reply nodata */ /* no additional section processing, * cname, dname or wildcard processing, * or using closest match for NSEC. * or using closest match for returning delegation downwards */ int rcode = ld?LDNS_RCODE_NOERROR:LDNS_RCODE_NXDOMAIN; if(z->soa) return local_encode(qinfo, edns, buf, temp, z->soa, 0, rcode); error_encode(buf, (rcode|BIT_AA), qinfo, *(uint16_t*)sldns_buffer_begin(buf), sldns_buffer_read_u16_at(buf, 2), edns); return 1; } else if(z->type == local_zone_typetransparent) { /* no NODATA or NXDOMAINS for this zone type */ return 0; } /* else z->type == local_zone_transparent */ /* if the zone is transparent and the name exists, but the type * does not, then we should make this noerror/nodata */ if(ld && ld->rrsets) { int rcode = LDNS_RCODE_NOERROR; if(z->soa) return local_encode(qinfo, edns, buf, temp, z->soa, 0, rcode); error_encode(buf, (rcode|BIT_AA), qinfo, *(uint16_t*)sldns_buffer_begin(buf), sldns_buffer_read_u16_at(buf, 2), edns); return 1; } /* stop here, and resolve further on */ return 0; } /** print log information for an inform zone query */ static void lz_inform_print(struct local_zone* z, struct query_info* qinfo, struct comm_reply* repinfo) { char ip[128], txt[512]; char zname[LDNS_MAX_DOMAINLEN+1]; uint16_t port = ntohs(((struct sockaddr_in*)&repinfo->addr)->sin_port); dname_str(z->name, zname); addr_to_str(&repinfo->addr, repinfo->addrlen, ip, sizeof(ip)); snprintf(txt, sizeof(txt), "%s inform %s@%u", zname, ip, (unsigned)port); log_nametypeclass(0, txt, qinfo->qname, qinfo->qtype, qinfo->qclass); } int local_zones_answer(struct local_zones* zones, struct query_info* qinfo, struct edns_data* edns, sldns_buffer* buf, struct regional* temp, struct comm_reply* repinfo) { /* see if query is covered by a zone, * if so: - try to match (exact) local data * - look at zone type for negative response. */ int labs = dname_count_labels(qinfo->qname); struct local_data* ld; struct local_zone* z; int r; lock_rw_rdlock(&zones->lock); z = local_zones_lookup(zones, qinfo->qname, qinfo->qname_len, labs, qinfo->qclass); if(!z) { lock_rw_unlock(&zones->lock); return 0; } lock_rw_rdlock(&z->lock); lock_rw_unlock(&zones->lock); if((z->type == local_zone_inform || z->type == local_zone_inform_deny) && repinfo) lz_inform_print(z, qinfo, repinfo); if(local_data_answer(z, qinfo, edns, buf, temp, labs, &ld)) { lock_rw_unlock(&z->lock); return 1; } r = lz_zone_answer(z, qinfo, edns, buf, temp, ld); lock_rw_unlock(&z->lock); return r; } const char* local_zone_type2str(enum localzone_type t) { switch(t) { case local_zone_deny: return "deny"; case local_zone_refuse: return "refuse"; case local_zone_redirect: return "redirect"; case local_zone_transparent: return "transparent"; case local_zone_typetransparent: return "typetransparent"; case local_zone_static: return "static"; case local_zone_nodefault: return "nodefault"; case local_zone_inform: return "inform"; case local_zone_inform_deny: return "inform_deny"; } return "badtyped"; } int local_zone_str2type(const char* type, enum localzone_type* t) { if(strcmp(type, "deny") == 0) *t = local_zone_deny; else if(strcmp(type, "refuse") == 0) *t = local_zone_refuse; else if(strcmp(type, "static") == 0) *t = local_zone_static; else if(strcmp(type, "transparent") == 0) *t = local_zone_transparent; else if(strcmp(type, "typetransparent") == 0) *t = local_zone_typetransparent; else if(strcmp(type, "redirect") == 0) *t = local_zone_redirect; else if(strcmp(type, "inform") == 0) *t = local_zone_inform; else if(strcmp(type, "inform_deny") == 0) *t = local_zone_inform_deny; else return 0; return 1; } /** iterate over the kiddies of the given name and set their parent ptr */ static void set_kiddo_parents(struct local_zone* z, struct local_zone* match, struct local_zone* newp) { /* both zones and z are locked already */ /* in the sorted rbtree, the kiddies of z are located after z */ /* z must be present in the tree */ struct local_zone* p = z; p = (struct local_zone*)rbtree_next(&p->node); while(p!=(struct local_zone*)RBTREE_NULL && p->dclass == z->dclass && dname_strict_subdomain(p->name, p->namelabs, z->name, z->namelabs)) { /* update parent ptr */ /* only when matches with existing parent pointer, so that * deeper child structures are not touched, i.e. * update of x, and a.x, b.x, f.b.x, g.b.x, c.x, y * gets to update a.x, b.x and c.x */ lock_rw_wrlock(&p->lock); if(p->parent == match) p->parent = newp; lock_rw_unlock(&p->lock); p = (struct local_zone*)rbtree_next(&p->node); } } struct local_zone* local_zones_add_zone(struct local_zones* zones, uint8_t* name, size_t len, int labs, uint16_t dclass, enum localzone_type tp) { /* create */ struct local_zone* z = local_zone_create(name, len, labs, tp, dclass); if(!z) return NULL; lock_rw_wrlock(&z->lock); /* find the closest parent */ z->parent = local_zones_find(zones, name, len, labs, dclass); /* insert into the tree */ if(!rbtree_insert(&zones->ztree, &z->node)) { /* duplicate entry! */ lock_rw_unlock(&z->lock); local_zone_delete(z); log_err("internal: duplicate entry in local_zones_add_zone"); return NULL; } /* set parent pointers right */ set_kiddo_parents(z, z->parent, z); lock_rw_unlock(&z->lock); return z; } void local_zones_del_zone(struct local_zones* zones, struct local_zone* z) { /* fix up parents in tree */ lock_rw_wrlock(&z->lock); set_kiddo_parents(z, z, z->parent); /* remove from tree */ (void)rbtree_delete(&zones->ztree, z); /* delete the zone */ lock_rw_unlock(&z->lock); local_zone_delete(z); } int local_zones_add_RR(struct local_zones* zones, const char* rr) { uint8_t* rr_name; uint16_t rr_class; size_t len; int labs; struct local_zone* z; int r; if(!get_rr_nameclass(rr, &rr_name, &rr_class)) { return 0; } labs = dname_count_size_labels(rr_name, &len); /* could first try readlock then get writelock if zone does not exist, * but we do not add enough RRs (from multiple threads) to optimize */ lock_rw_wrlock(&zones->lock); z = local_zones_lookup(zones, rr_name, len, labs, rr_class); if(!z) { z = local_zones_add_zone(zones, rr_name, len, labs, rr_class, local_zone_transparent); if(!z) { lock_rw_unlock(&zones->lock); return 0; } } else { free(rr_name); } lock_rw_wrlock(&z->lock); lock_rw_unlock(&zones->lock); r = lz_enter_rr_into_zone(z, rr); lock_rw_unlock(&z->lock); return r; } /** returns true if the node is terminal so no deeper domain names exist */ static int is_terminal(struct local_data* d) { /* for empty nonterminals, the deeper domain names are sorted * right after them, so simply check the next name in the tree */ struct local_data* n = (struct local_data*)rbtree_next(&d->node); if(n == (struct local_data*)RBTREE_NULL) return 1; /* last in tree, no deeper node */ if(dname_strict_subdomain(n->name, n->namelabs, d->name, d->namelabs)) return 0; /* there is a deeper node */ return 1; } /** delete empty terminals from tree when final data is deleted */ static void del_empty_term(struct local_zone* z, struct local_data* d, uint8_t* name, size_t len, int labs) { while(d && d->rrsets == NULL && is_terminal(d)) { /* is this empty nonterminal? delete */ /* note, no memory recycling in zone region */ (void)rbtree_delete(&z->data, d); /* go up and to the next label */ if(dname_is_root(name)) return; dname_remove_label(&name, &len); labs--; d = lz_find_node(z, name, len, labs); } } void local_zones_del_data(struct local_zones* zones, uint8_t* name, size_t len, int labs, uint16_t dclass) { /* find zone */ struct local_zone* z; struct local_data* d; lock_rw_rdlock(&zones->lock); z = local_zones_lookup(zones, name, len, labs, dclass); if(!z) { /* no such zone, we're done */ lock_rw_unlock(&zones->lock); return; } lock_rw_wrlock(&z->lock); lock_rw_unlock(&zones->lock); /* find the domain */ d = lz_find_node(z, name, len, labs); if(d) { /* no memory recycling for zone deletions ... */ d->rrsets = NULL; /* did we delete the soa record ? */ if(query_dname_compare(d->name, z->name) == 0) z->soa = NULL; /* cleanup the empty nonterminals for this name */ del_empty_term(z, d, name, len, labs); } lock_rw_unlock(&z->lock); }