1428 lines
31 KiB
C
1428 lines
31 KiB
C
/*
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* resolver.c
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*
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* resolver implementation
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*
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* a Net::DNS like library for C
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*
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* (c) NLnet Labs, 2004-2006
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*
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* See the file LICENSE for the license
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*/
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#include <ldns/config.h>
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#include <ldns/ldns.h>
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#include <strings.h>
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/* Access function for reading
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* and setting the different Resolver
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* options */
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/* read */
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uint16_t
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ldns_resolver_port(const ldns_resolver *r)
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{
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return r->_port;
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}
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ldns_rdf *
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ldns_resolver_source(const ldns_resolver *r)
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{
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return r->_source;
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}
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uint16_t
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ldns_resolver_edns_udp_size(const ldns_resolver *r)
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{
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return r->_edns_udp_size;
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}
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uint8_t
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ldns_resolver_retry(const ldns_resolver *r)
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{
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return r->_retry;
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}
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uint8_t
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ldns_resolver_retrans(const ldns_resolver *r)
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{
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return r->_retrans;
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}
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bool
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ldns_resolver_fallback(const ldns_resolver *r)
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{
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return r->_fallback;
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}
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uint8_t
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ldns_resolver_ip6(const ldns_resolver *r)
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{
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return r->_ip6;
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}
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bool
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ldns_resolver_recursive(const ldns_resolver *r)
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{
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return r->_recursive;
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}
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bool
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ldns_resolver_debug(const ldns_resolver *r)
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{
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return r->_debug;
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}
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bool
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ldns_resolver_dnsrch(const ldns_resolver *r)
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{
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return r->_dnsrch;
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}
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bool
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ldns_resolver_fail(const ldns_resolver *r)
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{
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return r->_fail;
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}
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bool
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ldns_resolver_defnames(const ldns_resolver *r)
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{
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return r->_defnames;
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}
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ldns_rdf *
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ldns_resolver_domain(const ldns_resolver *r)
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{
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return r->_domain;
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}
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ldns_rdf **
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ldns_resolver_searchlist(const ldns_resolver *r)
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{
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return r->_searchlist;
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}
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ldns_rdf **
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ldns_resolver_nameservers(const ldns_resolver *r)
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{
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return r->_nameservers;
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}
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size_t
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ldns_resolver_nameserver_count(const ldns_resolver *r)
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{
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return r->_nameserver_count;
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}
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bool
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ldns_resolver_dnssec(const ldns_resolver *r)
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{
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return r->_dnssec;
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}
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bool
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ldns_resolver_dnssec_cd(const ldns_resolver *r)
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{
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return r->_dnssec_cd;
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}
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ldns_rr_list *
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ldns_resolver_dnssec_anchors(const ldns_resolver *r)
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{
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return r->_dnssec_anchors;
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}
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bool
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ldns_resolver_trusted_key(const ldns_resolver *r, ldns_rr_list * keys, ldns_rr_list * trusted_keys)
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{
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size_t i;
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bool result = false;
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ldns_rr_list * trust_anchors;
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ldns_rr * cur_rr;
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if (!r || !keys) { return false; }
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trust_anchors = ldns_resolver_dnssec_anchors(r);
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if (!trust_anchors) { return false; }
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for (i = 0; i < ldns_rr_list_rr_count(keys); i++) {
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cur_rr = ldns_rr_list_rr(keys, i);
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if (ldns_rr_list_contains_rr(trust_anchors, cur_rr)) {
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if (trusted_keys) { ldns_rr_list_push_rr(trusted_keys, cur_rr); }
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result = true;
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}
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}
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return result;
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}
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bool
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ldns_resolver_igntc(const ldns_resolver *r)
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{
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return r->_igntc;
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}
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bool
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ldns_resolver_usevc(const ldns_resolver *r)
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{
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return r->_usevc;
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}
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size_t *
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ldns_resolver_rtt(const ldns_resolver *r)
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{
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return r->_rtt;
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}
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size_t
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ldns_resolver_nameserver_rtt(const ldns_resolver *r, size_t pos)
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{
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size_t *rtt;
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assert(r != NULL);
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rtt = ldns_resolver_rtt(r);
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if (pos >= ldns_resolver_nameserver_count(r)) {
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/* error ?*/
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return 0;
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} else {
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return rtt[pos];
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}
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}
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struct timeval
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ldns_resolver_timeout(const ldns_resolver *r)
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{
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return r->_timeout;
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}
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char *
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ldns_resolver_tsig_keyname(const ldns_resolver *r)
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{
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return r->_tsig_keyname;
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}
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char *
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ldns_resolver_tsig_algorithm(const ldns_resolver *r)
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{
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return r->_tsig_algorithm;
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}
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char *
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ldns_resolver_tsig_keydata(const ldns_resolver *r)
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{
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return r->_tsig_keydata;
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}
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bool
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ldns_resolver_random(const ldns_resolver *r)
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{
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return r->_random;
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}
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size_t
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ldns_resolver_searchlist_count(const ldns_resolver *r)
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{
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return r->_searchlist_count;
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}
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/* write */
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void
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ldns_resolver_set_port(ldns_resolver *r, uint16_t p)
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{
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r->_port = p;
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}
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void
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ldns_resolver_set_source(ldns_resolver *r, ldns_rdf *s)
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{
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r->_source = s;
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}
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ldns_rdf *
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ldns_resolver_pop_nameserver(ldns_resolver *r)
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{
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ldns_rdf **nameservers;
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ldns_rdf *pop;
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size_t ns_count;
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size_t *rtt;
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assert(r != NULL);
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ns_count = ldns_resolver_nameserver_count(r);
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nameservers = ldns_resolver_nameservers(r);
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rtt = ldns_resolver_rtt(r);
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if (ns_count == 0 || !nameservers) {
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return NULL;
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}
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pop = nameservers[ns_count - 1];
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if (ns_count == 1) {
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LDNS_FREE(nameservers);
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LDNS_FREE(rtt);
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ldns_resolver_set_nameservers(r, NULL);
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ldns_resolver_set_rtt(r, NULL);
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} else {
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nameservers = LDNS_XREALLOC(nameservers, ldns_rdf *,
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(ns_count - 1));
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rtt = LDNS_XREALLOC(rtt, size_t, (ns_count - 1));
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ldns_resolver_set_nameservers(r, nameservers);
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ldns_resolver_set_rtt(r, rtt);
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}
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/* decr the count */
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ldns_resolver_dec_nameserver_count(r);
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return pop;
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}
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ldns_status
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ldns_resolver_push_nameserver(ldns_resolver *r, ldns_rdf *n)
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{
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ldns_rdf **nameservers;
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size_t ns_count;
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size_t *rtt;
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if (ldns_rdf_get_type(n) != LDNS_RDF_TYPE_A &&
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ldns_rdf_get_type(n) != LDNS_RDF_TYPE_AAAA) {
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return LDNS_STATUS_ERR;
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}
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ns_count = ldns_resolver_nameserver_count(r);
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nameservers = ldns_resolver_nameservers(r);
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rtt = ldns_resolver_rtt(r);
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/* make room for the next one */
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if (ns_count == 0) {
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nameservers = LDNS_XMALLOC(ldns_rdf *, 1);
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} else {
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nameservers = LDNS_XREALLOC(nameservers, ldns_rdf *, (ns_count + 1));
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}
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if(!nameservers)
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return LDNS_STATUS_MEM_ERR;
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/* set the new value in the resolver */
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ldns_resolver_set_nameservers(r, nameservers);
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/* don't forget the rtt */
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if (ns_count == 0) {
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rtt = LDNS_XMALLOC(size_t, 1);
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} else {
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rtt = LDNS_XREALLOC(rtt, size_t, (ns_count + 1));
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}
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if(!rtt)
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return LDNS_STATUS_MEM_ERR;
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/* slide n in its slot. */
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/* we clone it here, because then we can free the original
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* rr's where it stood */
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nameservers[ns_count] = ldns_rdf_clone(n);
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rtt[ns_count] = LDNS_RESOLV_RTT_MIN;
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ldns_resolver_incr_nameserver_count(r);
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ldns_resolver_set_rtt(r, rtt);
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return LDNS_STATUS_OK;
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}
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ldns_status
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ldns_resolver_push_nameserver_rr(ldns_resolver *r, ldns_rr *rr)
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{
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ldns_rdf *address;
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if ((!rr) || (ldns_rr_get_type(rr) != LDNS_RR_TYPE_A &&
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ldns_rr_get_type(rr) != LDNS_RR_TYPE_AAAA)) {
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return LDNS_STATUS_ERR;
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}
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address = ldns_rr_rdf(rr, 0); /* extract the ip number */
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if (address) {
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return ldns_resolver_push_nameserver(r, address);
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} else {
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return LDNS_STATUS_ERR;
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}
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}
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ldns_status
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ldns_resolver_push_nameserver_rr_list(ldns_resolver *r, ldns_rr_list *rrlist)
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{
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ldns_rr *rr;
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ldns_status stat;
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size_t i;
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stat = LDNS_STATUS_OK;
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if (rrlist) {
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for(i = 0; i < ldns_rr_list_rr_count(rrlist); i++) {
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rr = ldns_rr_list_rr(rrlist, i);
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if (ldns_resolver_push_nameserver_rr(r, rr) != LDNS_STATUS_OK) {
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stat = LDNS_STATUS_ERR;
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break;
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}
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}
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return stat;
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} else {
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return LDNS_STATUS_ERR;
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}
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}
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void
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ldns_resolver_set_edns_udp_size(ldns_resolver *r, uint16_t s)
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{
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r->_edns_udp_size = s;
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}
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void
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ldns_resolver_set_recursive(ldns_resolver *r, bool re)
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{
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r->_recursive = re;
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}
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void
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ldns_resolver_set_dnssec(ldns_resolver *r, bool d)
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{
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r->_dnssec = d;
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}
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void
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ldns_resolver_set_dnssec_cd(ldns_resolver *r, bool d)
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{
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r->_dnssec_cd = d;
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}
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void
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ldns_resolver_set_dnssec_anchors(ldns_resolver *r, ldns_rr_list * l)
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{
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r->_dnssec_anchors = l;
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}
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ldns_status
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ldns_resolver_push_dnssec_anchor(ldns_resolver *r, ldns_rr *rr)
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{
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ldns_rr_list * trust_anchors;
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if ((!rr) || (ldns_rr_get_type(rr) != LDNS_RR_TYPE_DNSKEY &&
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ldns_rr_get_type(rr) != LDNS_RR_TYPE_DS)) {
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return LDNS_STATUS_ERR;
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}
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if (!(trust_anchors = ldns_resolver_dnssec_anchors(r))) { /* Initialize */
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trust_anchors = ldns_rr_list_new();
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ldns_resolver_set_dnssec_anchors(r, trust_anchors);
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}
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return (ldns_rr_list_push_rr(trust_anchors, ldns_rr_clone(rr))) ? LDNS_STATUS_OK : LDNS_STATUS_ERR;
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}
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void
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ldns_resolver_set_igntc(ldns_resolver *r, bool i)
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{
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r->_igntc = i;
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}
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void
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ldns_resolver_set_usevc(ldns_resolver *r, bool vc)
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{
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r->_usevc = vc;
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}
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void
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ldns_resolver_set_debug(ldns_resolver *r, bool d)
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{
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r->_debug = d;
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}
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void
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ldns_resolver_set_ip6(ldns_resolver *r, uint8_t ip6)
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{
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r->_ip6 = ip6;
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}
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void
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ldns_resolver_set_fail(ldns_resolver *r, bool f)
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{
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r->_fail =f;
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}
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static void
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ldns_resolver_set_searchlist_count(ldns_resolver *r, size_t c)
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{
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r->_searchlist_count = c;
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}
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void
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ldns_resolver_set_nameserver_count(ldns_resolver *r, size_t c)
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{
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r->_nameserver_count = c;
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}
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void
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ldns_resolver_set_dnsrch(ldns_resolver *r, bool d)
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{
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r->_dnsrch = d;
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}
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void
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ldns_resolver_set_retry(ldns_resolver *r, uint8_t retry)
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{
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r->_retry = retry;
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}
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void
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ldns_resolver_set_retrans(ldns_resolver *r, uint8_t retrans)
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{
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r->_retrans = retrans;
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}
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void
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ldns_resolver_set_fallback(ldns_resolver *r, bool fallback)
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{
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r->_fallback = fallback;
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}
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void
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ldns_resolver_set_nameservers(ldns_resolver *r, ldns_rdf **n)
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{
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r->_nameservers = n;
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}
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void
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ldns_resolver_set_defnames(ldns_resolver *r, bool d)
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{
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r->_defnames = d;
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}
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void
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ldns_resolver_set_rtt(ldns_resolver *r, size_t *rtt)
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{
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r->_rtt = rtt;
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}
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void
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ldns_resolver_set_nameserver_rtt(ldns_resolver *r, size_t pos, size_t value)
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{
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size_t *rtt;
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assert(r != NULL);
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rtt = ldns_resolver_rtt(r);
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if (pos >= ldns_resolver_nameserver_count(r)) {
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/* error ?*/
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} else {
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rtt[pos] = value;
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}
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}
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void
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ldns_resolver_incr_nameserver_count(ldns_resolver *r)
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{
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size_t c;
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c = ldns_resolver_nameserver_count(r);
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ldns_resolver_set_nameserver_count(r, ++c);
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}
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void
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ldns_resolver_dec_nameserver_count(ldns_resolver *r)
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{
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size_t c;
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c = ldns_resolver_nameserver_count(r);
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if (c == 0) {
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return;
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} else {
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ldns_resolver_set_nameserver_count(r, --c);
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}
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}
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void
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ldns_resolver_set_domain(ldns_resolver *r, ldns_rdf *d)
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{
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r->_domain = d;
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}
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void
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ldns_resolver_set_timeout(ldns_resolver *r, struct timeval timeout)
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{
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r->_timeout.tv_sec = timeout.tv_sec;
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r->_timeout.tv_usec = timeout.tv_usec;
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}
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void
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ldns_resolver_push_searchlist(ldns_resolver *r, ldns_rdf *d)
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{
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ldns_rdf **searchlist;
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size_t list_count;
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if (ldns_rdf_get_type(d) != LDNS_RDF_TYPE_DNAME) {
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return;
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}
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list_count = ldns_resolver_searchlist_count(r);
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searchlist = ldns_resolver_searchlist(r);
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searchlist = LDNS_XREALLOC(searchlist, ldns_rdf *, (list_count + 1));
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if (searchlist) {
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r->_searchlist = searchlist;
|
|
|
|
searchlist[list_count] = ldns_rdf_clone(d);
|
|
ldns_resolver_set_searchlist_count(r, list_count + 1);
|
|
} /* no way to report mem err */
|
|
}
|
|
|
|
void
|
|
ldns_resolver_set_tsig_keyname(ldns_resolver *r, char *tsig_keyname)
|
|
{
|
|
LDNS_FREE(r->_tsig_keyname);
|
|
r->_tsig_keyname = strdup(tsig_keyname);
|
|
}
|
|
|
|
void
|
|
ldns_resolver_set_tsig_algorithm(ldns_resolver *r, char *tsig_algorithm)
|
|
{
|
|
LDNS_FREE(r->_tsig_algorithm);
|
|
r->_tsig_algorithm = strdup(tsig_algorithm);
|
|
}
|
|
|
|
void
|
|
ldns_resolver_set_tsig_keydata(ldns_resolver *r, char *tsig_keydata)
|
|
{
|
|
LDNS_FREE(r->_tsig_keydata);
|
|
r->_tsig_keydata = strdup(tsig_keydata);
|
|
}
|
|
|
|
void
|
|
ldns_resolver_set_random(ldns_resolver *r, bool b)
|
|
{
|
|
r->_random = b;
|
|
}
|
|
|
|
/* more sophisticated functions */
|
|
ldns_resolver *
|
|
ldns_resolver_new(void)
|
|
{
|
|
ldns_resolver *r;
|
|
|
|
r = LDNS_MALLOC(ldns_resolver);
|
|
if (!r) {
|
|
return NULL;
|
|
}
|
|
|
|
r->_searchlist = NULL;
|
|
r->_nameservers = NULL;
|
|
r->_rtt = NULL;
|
|
|
|
/* defaults are filled out */
|
|
ldns_resolver_set_searchlist_count(r, 0);
|
|
ldns_resolver_set_nameserver_count(r, 0);
|
|
ldns_resolver_set_usevc(r, 0);
|
|
ldns_resolver_set_port(r, LDNS_PORT);
|
|
ldns_resolver_set_domain(r, NULL);
|
|
ldns_resolver_set_defnames(r, false);
|
|
ldns_resolver_set_retry(r, 3);
|
|
ldns_resolver_set_retrans(r, 2);
|
|
ldns_resolver_set_fallback(r, true);
|
|
ldns_resolver_set_fail(r, false);
|
|
ldns_resolver_set_edns_udp_size(r, 0);
|
|
ldns_resolver_set_dnssec(r, false);
|
|
ldns_resolver_set_dnssec_cd(r, false);
|
|
ldns_resolver_set_dnssec_anchors(r, NULL);
|
|
ldns_resolver_set_ip6(r, LDNS_RESOLV_INETANY);
|
|
ldns_resolver_set_igntc(r, false);
|
|
ldns_resolver_set_recursive(r, false);
|
|
ldns_resolver_set_dnsrch(r, true);
|
|
ldns_resolver_set_source(r, NULL);
|
|
|
|
/* randomize the nameserver to be queried
|
|
* when there are multiple
|
|
*/
|
|
ldns_resolver_set_random(r, true);
|
|
|
|
ldns_resolver_set_debug(r, 0);
|
|
|
|
r->_timeout.tv_sec = LDNS_DEFAULT_TIMEOUT_SEC;
|
|
r->_timeout.tv_usec = LDNS_DEFAULT_TIMEOUT_USEC;
|
|
|
|
/* TODO: fd=0 is actually a valid socket (stdin),
|
|
replace with -1 */
|
|
r->_socket = 0;
|
|
r->_axfr_soa_count = 0;
|
|
r->_axfr_i = 0;
|
|
r->_cur_axfr_pkt = NULL;
|
|
|
|
r->_tsig_keyname = NULL;
|
|
r->_tsig_keydata = NULL;
|
|
r->_tsig_algorithm = NULL;
|
|
return r;
|
|
}
|
|
|
|
ldns_status
|
|
ldns_resolver_new_frm_fp(ldns_resolver **res, FILE *fp)
|
|
{
|
|
return ldns_resolver_new_frm_fp_l(res, fp, NULL);
|
|
}
|
|
|
|
ldns_status
|
|
ldns_resolver_new_frm_fp_l(ldns_resolver **res, FILE *fp, int *line_nr)
|
|
{
|
|
ldns_resolver *r;
|
|
const char *keyword[LDNS_RESOLV_KEYWORDS];
|
|
char word[LDNS_MAX_LINELEN + 1];
|
|
int8_t expect;
|
|
uint8_t i;
|
|
ldns_rdf *tmp;
|
|
#ifdef HAVE_SSL
|
|
ldns_rr *tmp_rr;
|
|
#endif
|
|
ssize_t gtr, bgtr;
|
|
ldns_buffer *b;
|
|
int lnr = 0, oldline;
|
|
FILE* myfp = fp;
|
|
if(!line_nr) line_nr = &lnr;
|
|
|
|
if(!fp) {
|
|
myfp = fopen("/etc/resolv.conf", "r");
|
|
if(!myfp)
|
|
return LDNS_STATUS_FILE_ERR;
|
|
}
|
|
|
|
/* do this better
|
|
* expect =
|
|
* 0: keyword
|
|
* 1: default domain dname
|
|
* 2: NS aaaa or a record
|
|
*/
|
|
|
|
/* recognized keywords */
|
|
keyword[LDNS_RESOLV_NAMESERVER] = "nameserver";
|
|
keyword[LDNS_RESOLV_DEFDOMAIN] = "domain";
|
|
keyword[LDNS_RESOLV_SEARCH] = "search";
|
|
/* these two are read but not used atm TODO */
|
|
keyword[LDNS_RESOLV_SORTLIST] = "sortlist";
|
|
keyword[LDNS_RESOLV_OPTIONS] = "options";
|
|
keyword[LDNS_RESOLV_ANCHOR] = "anchor";
|
|
expect = LDNS_RESOLV_KEYWORD;
|
|
|
|
r = ldns_resolver_new();
|
|
if (!r) {
|
|
if(!fp) fclose(myfp);
|
|
return LDNS_STATUS_MEM_ERR;
|
|
}
|
|
|
|
gtr = 1;
|
|
word[0] = 0;
|
|
oldline = *line_nr;
|
|
expect = LDNS_RESOLV_KEYWORD;
|
|
while (gtr > 0) {
|
|
/* check comments */
|
|
if (word[0] == '#') {
|
|
word[0]='x';
|
|
if(oldline == *line_nr) {
|
|
/* skip until end of line */
|
|
int c;
|
|
do {
|
|
c = fgetc(myfp);
|
|
} while(c != EOF && c != '\n');
|
|
if(c=='\n') (*line_nr)++;
|
|
}
|
|
/* and read next to prepare for further parsing */
|
|
oldline = *line_nr;
|
|
continue;
|
|
}
|
|
oldline = *line_nr;
|
|
switch(expect) {
|
|
case LDNS_RESOLV_KEYWORD:
|
|
/* keyword */
|
|
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
|
|
if (gtr != 0) {
|
|
if(word[0] == '#') continue;
|
|
for(i = 0; i < LDNS_RESOLV_KEYWORDS; i++) {
|
|
if (strcasecmp(keyword[i], word) == 0) {
|
|
/* chosen the keyword and
|
|
* expect values carefully
|
|
*/
|
|
expect = i;
|
|
break;
|
|
}
|
|
}
|
|
/* no keyword recognized */
|
|
if (expect == LDNS_RESOLV_KEYWORD) {
|
|
/* skip line */
|
|
/*
|
|
ldns_resolver_deep_free(r);
|
|
if(!fp) fclose(myfp);
|
|
return LDNS_STATUS_SYNTAX_KEYWORD_ERR;
|
|
*/
|
|
}
|
|
}
|
|
break;
|
|
case LDNS_RESOLV_DEFDOMAIN:
|
|
/* default domain dname */
|
|
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
|
|
if (gtr == 0) {
|
|
if(!fp) fclose(myfp);
|
|
return LDNS_STATUS_SYNTAX_MISSING_VALUE_ERR;
|
|
}
|
|
if(word[0] == '#') {
|
|
expect = LDNS_RESOLV_KEYWORD;
|
|
continue;
|
|
}
|
|
tmp = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_DNAME, word);
|
|
if (!tmp) {
|
|
ldns_resolver_deep_free(r);
|
|
if(!fp) fclose(myfp);
|
|
return LDNS_STATUS_SYNTAX_DNAME_ERR;
|
|
}
|
|
|
|
/* DOn't free, because we copy the pointer */
|
|
ldns_resolver_set_domain(r, tmp);
|
|
expect = LDNS_RESOLV_KEYWORD;
|
|
break;
|
|
case LDNS_RESOLV_NAMESERVER:
|
|
/* NS aaaa or a record */
|
|
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
|
|
if (gtr == 0) {
|
|
if(!fp) fclose(myfp);
|
|
return LDNS_STATUS_SYNTAX_MISSING_VALUE_ERR;
|
|
}
|
|
if(word[0] == '#') {
|
|
expect = LDNS_RESOLV_KEYWORD;
|
|
continue;
|
|
}
|
|
if(strchr(word, '%')) {
|
|
/* snip off interface labels,
|
|
* fe80::222:19ff:fe31:4222%eth0 */
|
|
strchr(word, '%')[0]=0;
|
|
}
|
|
tmp = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_AAAA, word);
|
|
if (!tmp) {
|
|
/* try ip4 */
|
|
tmp = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_A, word);
|
|
}
|
|
/* could not parse it, exit */
|
|
if (!tmp) {
|
|
ldns_resolver_deep_free(r);
|
|
if(!fp) fclose(myfp);
|
|
return LDNS_STATUS_SYNTAX_ERR;
|
|
}
|
|
(void)ldns_resolver_push_nameserver(r, tmp);
|
|
ldns_rdf_deep_free(tmp);
|
|
expect = LDNS_RESOLV_KEYWORD;
|
|
break;
|
|
case LDNS_RESOLV_SEARCH:
|
|
/* search list domain dname */
|
|
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_SKIP_SPACE, 0, line_nr);
|
|
b = LDNS_MALLOC(ldns_buffer);
|
|
if(!b) {
|
|
ldns_resolver_deep_free(r);
|
|
if(!fp) fclose(myfp);
|
|
return LDNS_STATUS_MEM_ERR;
|
|
}
|
|
|
|
ldns_buffer_new_frm_data(b, word, (size_t) gtr);
|
|
if(ldns_buffer_status(b) != LDNS_STATUS_OK) {
|
|
LDNS_FREE(b);
|
|
ldns_resolver_deep_free(r);
|
|
if(!fp) fclose(myfp);
|
|
return LDNS_STATUS_MEM_ERR;
|
|
}
|
|
bgtr = ldns_bget_token(b, word, LDNS_PARSE_NORMAL, (size_t) gtr + 1);
|
|
while (bgtr > 0) {
|
|
gtr -= bgtr;
|
|
if(word[0] == '#') {
|
|
expect = LDNS_RESOLV_KEYWORD;
|
|
break;
|
|
}
|
|
tmp = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_DNAME, word);
|
|
if (!tmp) {
|
|
ldns_resolver_deep_free(r);
|
|
ldns_buffer_free(b);
|
|
if(!fp) fclose(myfp);
|
|
return LDNS_STATUS_SYNTAX_DNAME_ERR;
|
|
}
|
|
|
|
ldns_resolver_push_searchlist(r, tmp);
|
|
|
|
ldns_rdf_deep_free(tmp);
|
|
bgtr = ldns_bget_token(b, word, LDNS_PARSE_NORMAL,
|
|
(size_t) gtr + 1);
|
|
}
|
|
ldns_buffer_free(b);
|
|
if (expect != LDNS_RESOLV_KEYWORD) {
|
|
gtr = 1;
|
|
expect = LDNS_RESOLV_KEYWORD;
|
|
}
|
|
break;
|
|
case LDNS_RESOLV_SORTLIST:
|
|
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_SKIP_SPACE, 0, line_nr);
|
|
/* sortlist not implemented atm */
|
|
expect = LDNS_RESOLV_KEYWORD;
|
|
break;
|
|
case LDNS_RESOLV_OPTIONS:
|
|
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_SKIP_SPACE, 0, line_nr);
|
|
/* options not implemented atm */
|
|
expect = LDNS_RESOLV_KEYWORD;
|
|
break;
|
|
case LDNS_RESOLV_ANCHOR:
|
|
/* a file containing a DNSSEC trust anchor */
|
|
gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
|
|
if (gtr == 0) {
|
|
ldns_resolver_deep_free(r);
|
|
if(!fp) fclose(myfp);
|
|
return LDNS_STATUS_SYNTAX_MISSING_VALUE_ERR;
|
|
}
|
|
if(word[0] == '#') {
|
|
expect = LDNS_RESOLV_KEYWORD;
|
|
continue;
|
|
}
|
|
|
|
#ifdef HAVE_SSL
|
|
tmp_rr = ldns_read_anchor_file(word);
|
|
(void) ldns_resolver_push_dnssec_anchor(r, tmp_rr);
|
|
ldns_rr_free(tmp_rr);
|
|
#endif
|
|
expect = LDNS_RESOLV_KEYWORD;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(!fp)
|
|
fclose(myfp);
|
|
|
|
if (res) {
|
|
*res = r;
|
|
return LDNS_STATUS_OK;
|
|
} else {
|
|
ldns_resolver_deep_free(r);
|
|
return LDNS_STATUS_NULL;
|
|
}
|
|
}
|
|
|
|
ldns_status
|
|
ldns_resolver_new_frm_file(ldns_resolver **res, const char *filename)
|
|
{
|
|
ldns_resolver *r;
|
|
FILE *fp;
|
|
ldns_status s;
|
|
|
|
if (!filename) {
|
|
fp = fopen(LDNS_RESOLV_CONF, "r");
|
|
|
|
} else {
|
|
fp = fopen(filename, "r");
|
|
}
|
|
if (!fp) {
|
|
return LDNS_STATUS_FILE_ERR;
|
|
}
|
|
|
|
s = ldns_resolver_new_frm_fp(&r, fp);
|
|
fclose(fp);
|
|
if (s == LDNS_STATUS_OK) {
|
|
if (res) {
|
|
*res = r;
|
|
return LDNS_STATUS_OK;
|
|
} else {
|
|
ldns_resolver_free(r);
|
|
return LDNS_STATUS_NULL;
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
void
|
|
ldns_resolver_free(ldns_resolver *res)
|
|
{
|
|
LDNS_FREE(res);
|
|
}
|
|
|
|
void
|
|
ldns_resolver_deep_free(ldns_resolver *res)
|
|
{
|
|
size_t i;
|
|
|
|
if (res) {
|
|
if (res->_searchlist) {
|
|
for (i = 0; i < ldns_resolver_searchlist_count(res); i++) {
|
|
ldns_rdf_deep_free(res->_searchlist[i]);
|
|
}
|
|
LDNS_FREE(res->_searchlist);
|
|
}
|
|
if (res->_nameservers) {
|
|
for (i = 0; i < res->_nameserver_count; i++) {
|
|
ldns_rdf_deep_free(res->_nameservers[i]);
|
|
}
|
|
LDNS_FREE(res->_nameservers);
|
|
}
|
|
if (ldns_resolver_domain(res)) {
|
|
ldns_rdf_deep_free(ldns_resolver_domain(res));
|
|
}
|
|
if (res->_tsig_keyname) {
|
|
LDNS_FREE(res->_tsig_keyname);
|
|
}
|
|
if (res->_tsig_keydata) {
|
|
LDNS_FREE(res->_tsig_keydata);
|
|
}
|
|
if (res->_tsig_algorithm) {
|
|
LDNS_FREE(res->_tsig_algorithm);
|
|
}
|
|
|
|
if (res->_cur_axfr_pkt) {
|
|
ldns_pkt_free(res->_cur_axfr_pkt);
|
|
}
|
|
|
|
if (res->_rtt) {
|
|
LDNS_FREE(res->_rtt);
|
|
}
|
|
if (res->_dnssec_anchors) {
|
|
ldns_rr_list_deep_free(res->_dnssec_anchors);
|
|
}
|
|
LDNS_FREE(res);
|
|
}
|
|
}
|
|
|
|
ldns_status
|
|
ldns_resolver_search_status(ldns_pkt** pkt,
|
|
ldns_resolver *r, const ldns_rdf *name,
|
|
ldns_rr_type t, ldns_rr_class c, uint16_t flags)
|
|
{
|
|
ldns_rdf *new_name;
|
|
ldns_rdf **search_list;
|
|
size_t i;
|
|
ldns_status s = LDNS_STATUS_OK;
|
|
|
|
if (ldns_dname_absolute(name)) {
|
|
/* query as-is */
|
|
return ldns_resolver_query_status(pkt, r, name, t, c, flags);
|
|
} else if (ldns_resolver_dnsrch(r)) {
|
|
search_list = ldns_resolver_searchlist(r);
|
|
for (i = 0; i < ldns_resolver_searchlist_count(r); i++) {
|
|
new_name = ldns_dname_cat_clone(name, search_list[i]);
|
|
|
|
s = ldns_resolver_query_status(pkt, r,
|
|
new_name, t, c, flags);
|
|
ldns_rdf_free(new_name);
|
|
if (pkt) {
|
|
if (s == LDNS_STATUS_OK && *pkt &&
|
|
ldns_pkt_get_rcode(*pkt) ==
|
|
LDNS_RCODE_NOERROR) {
|
|
return LDNS_STATUS_OK;
|
|
}
|
|
ldns_pkt_free(*pkt);
|
|
}
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
ldns_pkt *
|
|
ldns_resolver_search(const ldns_resolver *r,const ldns_rdf *name,
|
|
ldns_rr_type t, ldns_rr_class c, uint16_t flags)
|
|
{
|
|
ldns_pkt* pkt = NULL;
|
|
if (ldns_resolver_search_status(&pkt, (ldns_resolver *)r,
|
|
name, t, c, flags) != LDNS_STATUS_OK) {
|
|
ldns_pkt_free(pkt);
|
|
}
|
|
return pkt;
|
|
}
|
|
|
|
ldns_status
|
|
ldns_resolver_query_status(ldns_pkt** pkt,
|
|
ldns_resolver *r, const ldns_rdf *name,
|
|
ldns_rr_type t, ldns_rr_class c, uint16_t flags)
|
|
{
|
|
ldns_rdf *newname;
|
|
ldns_status status;
|
|
|
|
if (!ldns_resolver_defnames(r) || !ldns_resolver_domain(r)) {
|
|
return ldns_resolver_send(pkt, r, name, t, c, flags);
|
|
}
|
|
|
|
newname = ldns_dname_cat_clone(name, ldns_resolver_domain(r));
|
|
if (!newname) {
|
|
return LDNS_STATUS_MEM_ERR;
|
|
}
|
|
status = ldns_resolver_send(pkt, r, newname, t, c, flags);
|
|
ldns_rdf_free(newname);
|
|
return status;
|
|
}
|
|
|
|
ldns_pkt *
|
|
ldns_resolver_query(const ldns_resolver *r, const ldns_rdf *name,
|
|
ldns_rr_type t, ldns_rr_class c, uint16_t flags)
|
|
{
|
|
ldns_pkt* pkt = NULL;
|
|
if (ldns_resolver_query_status(&pkt, (ldns_resolver *)r,
|
|
name, t, c, flags) != LDNS_STATUS_OK) {
|
|
ldns_pkt_free(pkt);
|
|
}
|
|
return pkt;
|
|
}
|
|
|
|
static size_t *
|
|
ldns_resolver_backup_rtt(ldns_resolver *r)
|
|
{
|
|
size_t *new_rtt;
|
|
size_t *old_rtt = ldns_resolver_rtt(r);
|
|
|
|
if (old_rtt && ldns_resolver_nameserver_count(r)) {
|
|
new_rtt = LDNS_XMALLOC(size_t
|
|
, ldns_resolver_nameserver_count(r));
|
|
memcpy(new_rtt, old_rtt, sizeof(size_t)
|
|
* ldns_resolver_nameserver_count(r));
|
|
ldns_resolver_set_rtt(r, new_rtt);
|
|
return old_rtt;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
ldns_resolver_restore_rtt(ldns_resolver *r, size_t *old_rtt)
|
|
{
|
|
size_t *cur_rtt = ldns_resolver_rtt(r);
|
|
|
|
if (cur_rtt) {
|
|
LDNS_FREE(cur_rtt);
|
|
}
|
|
ldns_resolver_set_rtt(r, old_rtt);
|
|
}
|
|
|
|
ldns_status
|
|
ldns_resolver_send_pkt(ldns_pkt **answer, ldns_resolver *r,
|
|
ldns_pkt *query_pkt)
|
|
{
|
|
ldns_pkt *answer_pkt = NULL;
|
|
ldns_status stat = LDNS_STATUS_OK;
|
|
size_t *rtt;
|
|
|
|
stat = ldns_send(&answer_pkt, (ldns_resolver *)r, query_pkt);
|
|
if (stat != LDNS_STATUS_OK) {
|
|
if(answer_pkt) {
|
|
ldns_pkt_free(answer_pkt);
|
|
answer_pkt = NULL;
|
|
}
|
|
} else {
|
|
/* if tc=1 fall back to EDNS and/or TCP */
|
|
/* check for tcp first (otherwise we don't care about tc=1) */
|
|
if (!ldns_resolver_usevc(r) && ldns_resolver_fallback(r)) {
|
|
if (ldns_pkt_tc(answer_pkt)) {
|
|
/* was EDNS0 set? */
|
|
if (ldns_pkt_edns_udp_size(query_pkt) == 0) {
|
|
ldns_pkt_set_edns_udp_size(query_pkt
|
|
, 4096);
|
|
ldns_pkt_free(answer_pkt);
|
|
/* Nameservers should not become
|
|
* unreachable because fragments are
|
|
* dropped (network error). We might
|
|
* still have success with TCP.
|
|
* Therefore maintain reachability
|
|
* statuses of the nameservers by
|
|
* backup and restore the rtt list.
|
|
*/
|
|
rtt = ldns_resolver_backup_rtt(r);
|
|
stat = ldns_send(&answer_pkt, r
|
|
, query_pkt);
|
|
ldns_resolver_restore_rtt(r, rtt);
|
|
}
|
|
/* either way, if it is still truncated, use TCP */
|
|
if (stat != LDNS_STATUS_OK ||
|
|
ldns_pkt_tc(answer_pkt)) {
|
|
ldns_resolver_set_usevc(r, true);
|
|
ldns_pkt_free(answer_pkt);
|
|
stat = ldns_send(&answer_pkt, r, query_pkt);
|
|
ldns_resolver_set_usevc(r, false);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (answer) {
|
|
*answer = answer_pkt;
|
|
}
|
|
|
|
return stat;
|
|
}
|
|
|
|
ldns_status
|
|
ldns_resolver_prepare_query_pkt(ldns_pkt **query_pkt, ldns_resolver *r,
|
|
const ldns_rdf *name, ldns_rr_type t,
|
|
ldns_rr_class c, uint16_t flags)
|
|
{
|
|
struct timeval now;
|
|
|
|
/* prepare a question pkt from the parameters
|
|
* and then send this */
|
|
if (t == LDNS_RR_TYPE_IXFR) {
|
|
*query_pkt = ldns_pkt_ixfr_request_new(ldns_rdf_clone(name),
|
|
c, flags, NULL);
|
|
} else {
|
|
*query_pkt = ldns_pkt_query_new(ldns_rdf_clone(name), t, c, flags);
|
|
}
|
|
if (!*query_pkt) {
|
|
return LDNS_STATUS_ERR;
|
|
}
|
|
|
|
/* set DO bit if necessary */
|
|
if (ldns_resolver_dnssec(r)) {
|
|
if (ldns_resolver_edns_udp_size(r) == 0) {
|
|
ldns_resolver_set_edns_udp_size(r, 4096);
|
|
}
|
|
ldns_pkt_set_edns_do(*query_pkt, true);
|
|
if (ldns_resolver_dnssec_cd(r) || (flags & LDNS_CD)) {
|
|
ldns_pkt_set_cd(*query_pkt, true);
|
|
}
|
|
}
|
|
|
|
/* transfer the udp_edns_size from the resolver to the packet */
|
|
if (ldns_resolver_edns_udp_size(r) != 0) {
|
|
ldns_pkt_set_edns_udp_size(*query_pkt, ldns_resolver_edns_udp_size(r));
|
|
}
|
|
|
|
/* set the timestamp */
|
|
now.tv_sec = time(NULL);
|
|
now.tv_usec = 0;
|
|
ldns_pkt_set_timestamp(*query_pkt, now);
|
|
|
|
|
|
if (ldns_resolver_debug(r)) {
|
|
ldns_pkt_print(stdout, *query_pkt);
|
|
}
|
|
|
|
/* only set the id if it is not set yet */
|
|
if (ldns_pkt_id(*query_pkt) == 0) {
|
|
ldns_pkt_set_random_id(*query_pkt);
|
|
}
|
|
|
|
return LDNS_STATUS_OK;
|
|
}
|
|
|
|
|
|
ldns_status
|
|
ldns_resolver_send(ldns_pkt **answer, ldns_resolver *r, const ldns_rdf *name,
|
|
ldns_rr_type t, ldns_rr_class c, uint16_t flags)
|
|
{
|
|
ldns_pkt *query_pkt;
|
|
ldns_pkt *answer_pkt;
|
|
ldns_status status;
|
|
|
|
assert(r != NULL);
|
|
assert(name != NULL);
|
|
|
|
answer_pkt = NULL;
|
|
|
|
/* do all the preprocessing here, then fire of an query to
|
|
* the network */
|
|
|
|
if (0 == t) {
|
|
t= LDNS_RR_TYPE_A;
|
|
}
|
|
if (0 == c) {
|
|
c= LDNS_RR_CLASS_IN;
|
|
}
|
|
if (0 == ldns_resolver_nameserver_count(r)) {
|
|
return LDNS_STATUS_RES_NO_NS;
|
|
}
|
|
if (ldns_rdf_get_type(name) != LDNS_RDF_TYPE_DNAME) {
|
|
return LDNS_STATUS_RES_QUERY;
|
|
}
|
|
|
|
status = ldns_resolver_prepare_query_pkt(&query_pkt, r, name,
|
|
t, c, flags);
|
|
if (status != LDNS_STATUS_OK) {
|
|
return status;
|
|
}
|
|
|
|
/* if tsig values are set, tsign it */
|
|
/* TODO: make last 3 arguments optional too? maybe make complete
|
|
rr instead of separate values in resolver (and packet)
|
|
Jelte
|
|
should this go in pkt_prepare?
|
|
*/
|
|
if (ldns_resolver_tsig_keyname(r) && ldns_resolver_tsig_keydata(r)) {
|
|
#ifdef HAVE_SSL
|
|
status = ldns_pkt_tsig_sign(query_pkt,
|
|
ldns_resolver_tsig_keyname(r),
|
|
ldns_resolver_tsig_keydata(r),
|
|
300, ldns_resolver_tsig_algorithm(r), NULL);
|
|
if (status != LDNS_STATUS_OK) {
|
|
ldns_pkt_free(query_pkt);
|
|
return LDNS_STATUS_CRYPTO_TSIG_ERR;
|
|
}
|
|
#else
|
|
ldns_pkt_free(query_pkt);
|
|
return LDNS_STATUS_CRYPTO_TSIG_ERR;
|
|
#endif /* HAVE_SSL */
|
|
}
|
|
|
|
status = ldns_resolver_send_pkt(&answer_pkt, r, query_pkt);
|
|
ldns_pkt_free(query_pkt);
|
|
|
|
/* allows answer to be NULL when not interested in return value */
|
|
if (answer) {
|
|
*answer = answer_pkt;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
ldns_rr *
|
|
ldns_axfr_next(ldns_resolver *resolver)
|
|
{
|
|
ldns_rr *cur_rr;
|
|
uint8_t *packet_wire;
|
|
size_t packet_wire_size;
|
|
ldns_lookup_table *rcode;
|
|
ldns_status status;
|
|
|
|
/* check if start() has been called */
|
|
if (!resolver || resolver->_socket == 0) {
|
|
return NULL;
|
|
}
|
|
|
|
if (resolver->_cur_axfr_pkt) {
|
|
if (resolver->_axfr_i == ldns_pkt_ancount(resolver->_cur_axfr_pkt)) {
|
|
ldns_pkt_free(resolver->_cur_axfr_pkt);
|
|
resolver->_cur_axfr_pkt = NULL;
|
|
return ldns_axfr_next(resolver);
|
|
}
|
|
cur_rr = ldns_rr_clone(ldns_rr_list_rr(
|
|
ldns_pkt_answer(resolver->_cur_axfr_pkt),
|
|
resolver->_axfr_i));
|
|
resolver->_axfr_i++;
|
|
if (ldns_rr_get_type(cur_rr) == LDNS_RR_TYPE_SOA) {
|
|
resolver->_axfr_soa_count++;
|
|
if (resolver->_axfr_soa_count >= 2) {
|
|
#ifndef USE_WINSOCK
|
|
close(resolver->_socket);
|
|
#else
|
|
closesocket(resolver->_socket);
|
|
#endif
|
|
resolver->_socket = 0;
|
|
ldns_pkt_free(resolver->_cur_axfr_pkt);
|
|
resolver->_cur_axfr_pkt = NULL;
|
|
}
|
|
}
|
|
return cur_rr;
|
|
} else {
|
|
packet_wire = ldns_tcp_read_wire(resolver->_socket, &packet_wire_size);
|
|
if(!packet_wire)
|
|
return NULL;
|
|
|
|
status = ldns_wire2pkt(&resolver->_cur_axfr_pkt, packet_wire,
|
|
packet_wire_size);
|
|
LDNS_FREE(packet_wire);
|
|
|
|
resolver->_axfr_i = 0;
|
|
if (status != LDNS_STATUS_OK) {
|
|
/* TODO: make status return type of this function (...api change) */
|
|
#ifdef STDERR_MSGS
|
|
fprintf(stderr, "Error parsing rr during AXFR: %s\n", ldns_get_errorstr_by_id(status));
|
|
#endif
|
|
|
|
/* we must now also close the socket, otherwise subsequent uses of the
|
|
same resolver structure will fail because the link is still open or
|
|
in an undefined state */
|
|
#ifndef USE_WINSOCK
|
|
close(resolver->_socket);
|
|
#else
|
|
closesocket(resolver->_socket);
|
|
#endif
|
|
resolver->_socket = 0;
|
|
|
|
return NULL;
|
|
} else if (ldns_pkt_get_rcode(resolver->_cur_axfr_pkt) != 0) {
|
|
rcode = ldns_lookup_by_id(ldns_rcodes, (int) ldns_pkt_get_rcode(resolver->_cur_axfr_pkt));
|
|
#ifdef STDERR_MSGS
|
|
if (rcode) {
|
|
fprintf(stderr, "Error in AXFR: %s\n",
|
|
rcode->name);
|
|
} else {
|
|
fprintf(stderr, "Error in AXFR: %d\n",
|
|
(int) ldns_pkt_get_rcode(
|
|
resolver->_cur_axfr_pkt));
|
|
}
|
|
#endif
|
|
|
|
/* we must now also close the socket, otherwise subsequent uses of the
|
|
same resolver structure will fail because the link is still open or
|
|
in an undefined state */
|
|
#ifndef USE_WINSOCK
|
|
close(resolver->_socket);
|
|
#else
|
|
closesocket(resolver->_socket);
|
|
#endif
|
|
resolver->_socket = 0;
|
|
|
|
return NULL;
|
|
} else {
|
|
return ldns_axfr_next(resolver);
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* this function is needed to abort a transfer that is in progress;
|
|
* without it an aborted transfer will lead to the AXFR code in the
|
|
* library staying in an indetermined state because the socket for the
|
|
* AXFR is never closed
|
|
*/
|
|
static void
|
|
ldns_axfr_abort(ldns_resolver *resolver)
|
|
{
|
|
/* Only abort if an actual AXFR is in progress */
|
|
if (resolver->_socket != 0)
|
|
{
|
|
#ifndef USE_WINSOCK
|
|
close(resolver->_socket);
|
|
#else
|
|
closesocket(resolver->_socket);
|
|
#endif
|
|
resolver->_socket = 0;
|
|
}
|
|
}
|
|
|
|
bool
|
|
ldns_axfr_complete(const ldns_resolver *res)
|
|
{
|
|
/* complete when soa count is 2? */
|
|
return res->_axfr_soa_count == 2;
|
|
}
|
|
|
|
ldns_pkt *
|
|
ldns_axfr_last_pkt(const ldns_resolver *res)
|
|
{
|
|
return res->_cur_axfr_pkt;
|
|
}
|
|
|
|
/* random isn't really that good */
|
|
void
|
|
ldns_resolver_nameservers_randomize(ldns_resolver *r)
|
|
{
|
|
uint16_t i, j;
|
|
ldns_rdf **ns, *tmpns;
|
|
size_t *rtt, tmprtt;
|
|
|
|
/* should I check for ldns_resolver_random?? */
|
|
assert(r != NULL);
|
|
|
|
ns = ldns_resolver_nameservers(r);
|
|
rtt = ldns_resolver_rtt(r);
|
|
for (i = 0; i < ldns_resolver_nameserver_count(r); i++) {
|
|
j = ldns_get_random() % ldns_resolver_nameserver_count(r);
|
|
tmpns = ns[i];
|
|
ns[i] = ns[j];
|
|
ns[j] = tmpns;
|
|
tmprtt = rtt[i];
|
|
rtt[i] = rtt[j];
|
|
rtt[j] = tmprtt;
|
|
}
|
|
ldns_resolver_set_nameservers(r, ns);
|
|
}
|
|
|