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-rw-r--r--external/unbound/iterator/iter_hints.c542
1 files changed, 542 insertions, 0 deletions
diff --git a/external/unbound/iterator/iter_hints.c b/external/unbound/iterator/iter_hints.c
new file mode 100644
index 000000000..57b57c2e0
--- /dev/null
+++ b/external/unbound/iterator/iter_hints.c
@@ -0,0 +1,542 @@
+/*
+ * iterator/iter_hints.c - iterative resolver module stub and root hints.
+ *
+ * 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 assist the iterator module.
+ * Keep track of stub and root hints, and read those from config.
+ */
+#include "config.h"
+#include "iterator/iter_hints.h"
+#include "iterator/iter_delegpt.h"
+#include "util/log.h"
+#include "util/config_file.h"
+#include "util/net_help.h"
+#include "util/data/dname.h"
+#include "ldns/rrdef.h"
+#include "ldns/str2wire.h"
+#include "ldns/wire2str.h"
+
+struct iter_hints*
+hints_create(void)
+{
+ struct iter_hints* hints = (struct iter_hints*)calloc(1,
+ sizeof(struct iter_hints));
+ if(!hints)
+ return NULL;
+ return hints;
+}
+
+static void hints_stub_free(struct iter_hints_stub* s)
+{
+ if(!s) return;
+ delegpt_free_mlc(s->dp);
+ free(s);
+}
+
+static void delhintnode(rbnode_t* n, void* ATTR_UNUSED(arg))
+{
+ struct iter_hints_stub* node = (struct iter_hints_stub*)n;
+ hints_stub_free(node);
+}
+
+static void hints_del_tree(struct iter_hints* hints)
+{
+ traverse_postorder(&hints->tree, &delhintnode, NULL);
+}
+
+void
+hints_delete(struct iter_hints* hints)
+{
+ if(!hints)
+ return;
+ hints_del_tree(hints);
+ free(hints);
+}
+
+/** add hint to delegation hints */
+static int
+ah(struct delegpt* dp, const char* sv, const char* ip)
+{
+ struct sockaddr_storage addr;
+ socklen_t addrlen;
+ size_t dname_len;
+ uint8_t* dname = sldns_str2wire_dname(sv, &dname_len);
+ if(!dname) {
+ log_err("could not parse %s", sv);
+ return 0;
+ }
+ if(!delegpt_add_ns_mlc(dp, dname, 0) ||
+ !extstrtoaddr(ip, &addr, &addrlen) ||
+ !delegpt_add_target_mlc(dp, dname, dname_len,
+ &addr, addrlen, 0, 0)) {
+ free(dname);
+ return 0;
+ }
+ free(dname);
+ return 1;
+}
+
+/** obtain compiletime provided root hints */
+static struct delegpt*
+compile_time_root_prime(int do_ip4, int do_ip6)
+{
+ /* from:
+ ; This file is made available by InterNIC
+ ; under anonymous FTP as
+ ; file /domain/named.cache
+ ; on server FTP.INTERNIC.NET
+ ; -OR- RS.INTERNIC.NET
+ ;
+ ; related version of root zone: changes-on-20120103
+ */
+ struct delegpt* dp = delegpt_create_mlc((uint8_t*)"\000");
+ if(!dp)
+ return NULL;
+ dp->has_parent_side_NS = 1;
+ if(do_ip4) {
+ if(!ah(dp, "A.ROOT-SERVERS.NET.", "198.41.0.4")) goto failed;
+ if(!ah(dp, "B.ROOT-SERVERS.NET.", "192.228.79.201")) goto failed;
+ if(!ah(dp, "C.ROOT-SERVERS.NET.", "192.33.4.12")) goto failed;
+ if(!ah(dp, "D.ROOT-SERVERS.NET.", "199.7.91.13")) goto failed;
+ if(!ah(dp, "E.ROOT-SERVERS.NET.", "192.203.230.10")) goto failed;
+ if(!ah(dp, "F.ROOT-SERVERS.NET.", "192.5.5.241")) goto failed;
+ if(!ah(dp, "G.ROOT-SERVERS.NET.", "192.112.36.4")) goto failed;
+ if(!ah(dp, "H.ROOT-SERVERS.NET.", "128.63.2.53")) goto failed;
+ if(!ah(dp, "I.ROOT-SERVERS.NET.", "192.36.148.17")) goto failed;
+ if(!ah(dp, "J.ROOT-SERVERS.NET.", "192.58.128.30")) goto failed;
+ if(!ah(dp, "K.ROOT-SERVERS.NET.", "193.0.14.129")) goto failed;
+ if(!ah(dp, "L.ROOT-SERVERS.NET.", "199.7.83.42")) goto failed;
+ if(!ah(dp, "M.ROOT-SERVERS.NET.", "202.12.27.33")) goto failed;
+ }
+ if(do_ip6) {
+ if(!ah(dp, "A.ROOT-SERVERS.NET.", "2001:503:ba3e::2:30")) goto failed;
+ if(!ah(dp, "B.ROOT-SERVERS.NET.", "2001:500:84::b")) goto failed;
+ if(!ah(dp, "C.ROOT-SERVERS.NET.", "2001:500:2::c")) goto failed;
+ if(!ah(dp, "D.ROOT-SERVERS.NET.", "2001:500:2d::d")) goto failed;
+ if(!ah(dp, "F.ROOT-SERVERS.NET.", "2001:500:2f::f")) goto failed;
+ if(!ah(dp, "H.ROOT-SERVERS.NET.", "2001:500:1::803f:235")) goto failed;
+ if(!ah(dp, "I.ROOT-SERVERS.NET.", "2001:7fe::53")) goto failed;
+ if(!ah(dp, "J.ROOT-SERVERS.NET.", "2001:503:c27::2:30")) goto failed;
+ if(!ah(dp, "K.ROOT-SERVERS.NET.", "2001:7fd::1")) goto failed;
+ if(!ah(dp, "L.ROOT-SERVERS.NET.", "2001:500:3::42")) goto failed;
+ if(!ah(dp, "M.ROOT-SERVERS.NET.", "2001:dc3::35")) goto failed;
+ }
+ return dp;
+failed:
+ delegpt_free_mlc(dp);
+ return 0;
+}
+
+/** insert new hint info into hint structure */
+static int
+hints_insert(struct iter_hints* hints, uint16_t c, struct delegpt* dp,
+ int noprime)
+{
+ struct iter_hints_stub* node = (struct iter_hints_stub*)malloc(
+ sizeof(struct iter_hints_stub));
+ if(!node) {
+ delegpt_free_mlc(dp);
+ return 0;
+ }
+ node->dp = dp;
+ node->noprime = (uint8_t)noprime;
+ if(!name_tree_insert(&hints->tree, &node->node, dp->name, dp->namelen,
+ dp->namelabs, c)) {
+ char buf[257];
+ dname_str(dp->name, buf);
+ log_err("second hints for zone %s ignored.", buf);
+ delegpt_free_mlc(dp);
+ free(node);
+ }
+ return 1;
+}
+
+/** set stub name */
+static struct delegpt*
+read_stubs_name(struct config_stub* s)
+{
+ struct delegpt* dp;
+ size_t dname_len;
+ uint8_t* dname;
+ if(!s->name) {
+ log_err("stub zone without a name");
+ return NULL;
+ }
+ dname = sldns_str2wire_dname(s->name, &dname_len);
+ if(!dname) {
+ log_err("cannot parse stub zone name %s", s->name);
+ return NULL;
+ }
+ if(!(dp=delegpt_create_mlc(dname))) {
+ free(dname);
+ log_err("out of memory");
+ return NULL;
+ }
+ free(dname);
+ return dp;
+}
+
+/** set stub host names */
+static int
+read_stubs_host(struct config_stub* s, struct delegpt* dp)
+{
+ struct config_strlist* p;
+ size_t dname_len;
+ uint8_t* dname;
+ for(p = s->hosts; p; p = p->next) {
+ log_assert(p->str);
+ dname = sldns_str2wire_dname(p->str, &dname_len);
+ if(!dname) {
+ log_err("cannot parse stub %s nameserver name: '%s'",
+ s->name, p->str);
+ return 0;
+ }
+ if(!delegpt_add_ns_mlc(dp, dname, 0)) {
+ free(dname);
+ log_err("out of memory");
+ return 0;
+ }
+ free(dname);
+ }
+ return 1;
+}
+
+/** set stub server addresses */
+static int
+read_stubs_addr(struct config_stub* s, struct delegpt* dp)
+{
+ struct config_strlist* p;
+ struct sockaddr_storage addr;
+ socklen_t addrlen;
+ for(p = s->addrs; p; p = p->next) {
+ log_assert(p->str);
+ if(!extstrtoaddr(p->str, &addr, &addrlen)) {
+ log_err("cannot parse stub %s ip address: '%s'",
+ s->name, p->str);
+ return 0;
+ }
+ if(!delegpt_add_addr_mlc(dp, &addr, addrlen, 0, 0)) {
+ log_err("out of memory");
+ return 0;
+ }
+ }
+ return 1;
+}
+
+/** read stubs config */
+static int
+read_stubs(struct iter_hints* hints, struct config_file* cfg)
+{
+ struct config_stub* s;
+ struct delegpt* dp;
+ for(s = cfg->stubs; s; s = s->next) {
+ if(!(dp=read_stubs_name(s)))
+ return 0;
+ if(!read_stubs_host(s, dp) || !read_stubs_addr(s, dp)) {
+ delegpt_free_mlc(dp);
+ return 0;
+ }
+ /* the flag is turned off for 'stub-first' so that the
+ * last resort will ask for parent-side NS record and thus
+ * fallback to the internet name servers on a failure */
+ dp->has_parent_side_NS = (uint8_t)!s->isfirst;
+ delegpt_log(VERB_QUERY, dp);
+ if(!hints_insert(hints, LDNS_RR_CLASS_IN, dp, !s->isprime))
+ return 0;
+ }
+ return 1;
+}
+
+/** read root hints from file */
+static int
+read_root_hints(struct iter_hints* hints, char* fname)
+{
+ struct sldns_file_parse_state pstate;
+ struct delegpt* dp;
+ uint8_t rr[LDNS_RR_BUF_SIZE];
+ size_t rr_len, dname_len;
+ int status;
+ uint16_t c = LDNS_RR_CLASS_IN;
+ FILE* f = fopen(fname, "r");
+ if(!f) {
+ log_err("could not read root hints %s: %s",
+ fname, strerror(errno));
+ return 0;
+ }
+ dp = delegpt_create_mlc(NULL);
+ if(!dp) {
+ log_err("out of memory reading root hints");
+ fclose(f);
+ return 0;
+ }
+ verbose(VERB_QUERY, "Reading root hints from %s", fname);
+ memset(&pstate, 0, sizeof(pstate));
+ pstate.lineno = 1;
+ dp->has_parent_side_NS = 1;
+ while(!feof(f)) {
+ rr_len = sizeof(rr);
+ dname_len = 0;
+ status = sldns_fp2wire_rr_buf(f, rr, &rr_len, &dname_len,
+ &pstate);
+ if(status != 0) {
+ log_err("reading root hints %s %d:%d: %s", fname,
+ pstate.lineno, LDNS_WIREPARSE_OFFSET(status),
+ sldns_get_errorstr_parse(status));
+ goto stop_read;
+ }
+ if(rr_len == 0)
+ continue; /* EMPTY line, TTL or ORIGIN */
+ if(sldns_wirerr_get_type(rr, rr_len, dname_len)
+ == LDNS_RR_TYPE_NS) {
+ if(!delegpt_add_ns_mlc(dp, sldns_wirerr_get_rdata(rr,
+ rr_len, dname_len), 0)) {
+ log_err("out of memory reading root hints");
+ goto stop_read;
+ }
+ c = sldns_wirerr_get_class(rr, rr_len, dname_len);
+ if(!dp->name) {
+ if(!delegpt_set_name_mlc(dp, rr)) {
+ log_err("out of memory.");
+ goto stop_read;
+ }
+ }
+ } else if(sldns_wirerr_get_type(rr, rr_len, dname_len)
+ == LDNS_RR_TYPE_A && sldns_wirerr_get_rdatalen(rr,
+ rr_len, dname_len) == INET_SIZE) {
+ struct sockaddr_in sa;
+ socklen_t len = (socklen_t)sizeof(sa);
+ memset(&sa, 0, len);
+ sa.sin_family = AF_INET;
+ sa.sin_port = (in_port_t)htons(UNBOUND_DNS_PORT);
+ memmove(&sa.sin_addr,
+ sldns_wirerr_get_rdata(rr, rr_len, dname_len),
+ INET_SIZE);
+ if(!delegpt_add_target_mlc(dp, rr, dname_len,
+ (struct sockaddr_storage*)&sa, len,
+ 0, 0)) {
+ log_err("out of memory reading root hints");
+ goto stop_read;
+ }
+ } else if(sldns_wirerr_get_type(rr, rr_len, dname_len)
+ == LDNS_RR_TYPE_AAAA && sldns_wirerr_get_rdatalen(rr,
+ rr_len, dname_len) == INET6_SIZE) {
+ struct sockaddr_in6 sa;
+ socklen_t len = (socklen_t)sizeof(sa);
+ memset(&sa, 0, len);
+ sa.sin6_family = AF_INET6;
+ sa.sin6_port = (in_port_t)htons(UNBOUND_DNS_PORT);
+ memmove(&sa.sin6_addr,
+ sldns_wirerr_get_rdata(rr, rr_len, dname_len),
+ INET6_SIZE);
+ if(!delegpt_add_target_mlc(dp, rr, dname_len,
+ (struct sockaddr_storage*)&sa, len,
+ 0, 0)) {
+ log_err("out of memory reading root hints");
+ goto stop_read;
+ }
+ } else {
+ char buf[17];
+ sldns_wire2str_type_buf(sldns_wirerr_get_type(rr,
+ rr_len, dname_len), buf, sizeof(buf));
+ log_warn("root hints %s:%d skipping type %s",
+ fname, pstate.lineno, buf);
+ }
+ }
+ fclose(f);
+ if(!dp->name) {
+ log_warn("root hints %s: no NS content", fname);
+ delegpt_free_mlc(dp);
+ return 1;
+ }
+ if(!hints_insert(hints, c, dp, 0)) {
+ return 0;
+ }
+ delegpt_log(VERB_QUERY, dp);
+ return 1;
+
+stop_read:
+ delegpt_free_mlc(dp);
+ fclose(f);
+ return 0;
+}
+
+/** read root hints list */
+static int
+read_root_hints_list(struct iter_hints* hints, struct config_file* cfg)
+{
+ struct config_strlist* p;
+ for(p = cfg->root_hints; p; p = p->next) {
+ log_assert(p->str);
+ if(p->str && p->str[0]) {
+ char* f = p->str;
+ if(cfg->chrootdir && cfg->chrootdir[0] &&
+ strncmp(p->str, cfg->chrootdir,
+ strlen(cfg->chrootdir)) == 0)
+ f += strlen(cfg->chrootdir);
+ if(!read_root_hints(hints, f))
+ return 0;
+ }
+ }
+ return 1;
+}
+
+int
+hints_apply_cfg(struct iter_hints* hints, struct config_file* cfg)
+{
+ hints_del_tree(hints);
+ name_tree_init(&hints->tree);
+
+ /* read root hints */
+ if(!read_root_hints_list(hints, cfg))
+ return 0;
+
+ /* read stub hints */
+ if(!read_stubs(hints, cfg))
+ return 0;
+
+ /* use fallback compiletime root hints */
+ if(!hints_lookup_root(hints, LDNS_RR_CLASS_IN)) {
+ struct delegpt* dp = compile_time_root_prime(cfg->do_ip4,
+ cfg->do_ip6);
+ verbose(VERB_ALGO, "no config, using builtin root hints.");
+ if(!dp)
+ return 0;
+ if(!hints_insert(hints, LDNS_RR_CLASS_IN, dp, 0))
+ return 0;
+ }
+
+ name_tree_init_parents(&hints->tree);
+ return 1;
+}
+
+struct delegpt*
+hints_lookup_root(struct iter_hints* hints, uint16_t qclass)
+{
+ uint8_t rootlab = 0;
+ struct iter_hints_stub *stub;
+ stub = (struct iter_hints_stub*)name_tree_find(&hints->tree,
+ &rootlab, 1, 1, qclass);
+ if(!stub)
+ return NULL;
+ return stub->dp;
+}
+
+struct iter_hints_stub*
+hints_lookup_stub(struct iter_hints* hints, uint8_t* qname,
+ uint16_t qclass, struct delegpt* cache_dp)
+{
+ size_t len;
+ int labs;
+ struct iter_hints_stub *r;
+
+ /* first lookup the stub */
+ labs = dname_count_size_labels(qname, &len);
+ r = (struct iter_hints_stub*)name_tree_lookup(&hints->tree, qname,
+ len, labs, qclass);
+ if(!r) return NULL;
+
+ /* If there is no cache (root prime situation) */
+ if(cache_dp == NULL) {
+ if(r->dp->namelabs != 1)
+ return r; /* no cache dp, use any non-root stub */
+ return NULL;
+ }
+
+ /*
+ * If the stub is same as the delegation we got
+ * And has noprime set, we need to 'prime' to use this stub instead.
+ */
+ if(r->noprime && query_dname_compare(cache_dp->name, r->dp->name)==0)
+ return r; /* use this stub instead of cached dp */
+
+ /*
+ * If our cached delegation point is above the hint, we need to prime.
+ */
+ if(dname_strict_subdomain(r->dp->name, r->dp->namelabs,
+ cache_dp->name, cache_dp->namelabs))
+ return r; /* need to prime this stub */
+ return NULL;
+}
+
+int hints_next_root(struct iter_hints* hints, uint16_t* qclass)
+{
+ return name_tree_next_root(&hints->tree, qclass);
+}
+
+size_t
+hints_get_mem(struct iter_hints* hints)
+{
+ size_t s;
+ struct iter_hints_stub* p;
+ if(!hints) return 0;
+ s = sizeof(*hints);
+ RBTREE_FOR(p, struct iter_hints_stub*, &hints->tree) {
+ s += sizeof(*p) + delegpt_get_mem(p->dp);
+ }
+ return s;
+}
+
+int
+hints_add_stub(struct iter_hints* hints, uint16_t c, struct delegpt* dp,
+ int noprime)
+{
+ struct iter_hints_stub *z;
+ if((z=(struct iter_hints_stub*)name_tree_find(&hints->tree,
+ dp->name, dp->namelen, dp->namelabs, c)) != NULL) {
+ (void)rbtree_delete(&hints->tree, &z->node);
+ hints_stub_free(z);
+ }
+ if(!hints_insert(hints, c, dp, noprime))
+ return 0;
+ name_tree_init_parents(&hints->tree);
+ return 1;
+}
+
+void
+hints_delete_stub(struct iter_hints* hints, uint16_t c, uint8_t* nm)
+{
+ struct iter_hints_stub *z;
+ size_t len;
+ int labs = dname_count_size_labels(nm, &len);
+ if(!(z=(struct iter_hints_stub*)name_tree_find(&hints->tree,
+ nm, len, labs, c)))
+ return; /* nothing to do */
+ (void)rbtree_delete(&hints->tree, &z->node);
+ hints_stub_free(z);
+ name_tree_init_parents(&hints->tree);
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 06:16:52 +0000