X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fresolve%2Fresolved-dns-scope.c;fp=src%2Fresolve%2Fresolved-dns-scope.c;h=0000000000000000000000000000000000000000;hb=2dd57213e1114c1e034e52b7ff8eaeaee752d9f3;hp=ba116de6f5ad599d07ba27c9a55ec27d7e4785f6;hpb=1dcca8e5fe679b21a7203d6e35d58aa7aa83bbe1;p=elogind.git
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
deleted file mode 100644
index ba116de6f..000000000
--- a/src/resolve/resolved-dns-scope.c
+++ /dev/null
@@ -1,794 +0,0 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2014 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see .
-***/
-
-#include
-
-#include "missing.h"
-#include "strv.h"
-#include "socket-util.h"
-#include "af-list.h"
-#include "resolved-dns-domain.h"
-#include "resolved-dns-scope.h"
-
-#define MULTICAST_RATELIMIT_INTERVAL_USEC (1*USEC_PER_SEC)
-#define MULTICAST_RATELIMIT_BURST 1000
-
-int dns_scope_new(Manager *m, DnsScope **ret, Link *l, DnsProtocol protocol, int family) {
- DnsScope *s;
-
- assert(m);
- assert(ret);
-
- s = new0(DnsScope, 1);
- if (!s)
- return -ENOMEM;
-
- s->manager = m;
- s->link = l;
- s->protocol = protocol;
- s->family = family;
-
- LIST_PREPEND(scopes, m->dns_scopes, s);
-
- dns_scope_llmnr_membership(s, true);
-
- log_debug("New scope on link %s, protocol %s, family %s", l ? l->name : "*", dns_protocol_to_string(protocol), family == AF_UNSPEC ? "*" : af_to_name(family));
-
- /* Enforce ratelimiting for the multicast protocols */
- RATELIMIT_INIT(s->ratelimit, MULTICAST_RATELIMIT_INTERVAL_USEC, MULTICAST_RATELIMIT_BURST);
-
- *ret = s;
- return 0;
-}
-
-DnsScope* dns_scope_free(DnsScope *s) {
- DnsTransaction *t;
- DnsResourceRecord *rr;
-
- if (!s)
- return NULL;
-
- log_debug("Removing scope on link %s, protocol %s, family %s", s->link ? s->link->name : "*", dns_protocol_to_string(s->protocol), s->family == AF_UNSPEC ? "*" : af_to_name(s->family));
-
- dns_scope_llmnr_membership(s, false);
-
- while ((t = s->transactions)) {
-
- /* Abort the transaction, but make sure it is not
- * freed while we still look at it */
-
- t->block_gc++;
- dns_transaction_complete(t, DNS_TRANSACTION_ABORTED);
- t->block_gc--;
-
- dns_transaction_free(t);
- }
-
- while ((rr = ordered_hashmap_steal_first(s->conflict_queue)))
- dns_resource_record_unref(rr);
-
- ordered_hashmap_free(s->conflict_queue);
- sd_event_source_unref(s->conflict_event_source);
-
- dns_cache_flush(&s->cache);
- dns_zone_flush(&s->zone);
-
- LIST_REMOVE(scopes, s->manager->dns_scopes, s);
- strv_free(s->domains);
- free(s);
-
- return NULL;
-}
-
-DnsServer *dns_scope_get_dns_server(DnsScope *s) {
- assert(s);
-
- if (s->protocol != DNS_PROTOCOL_DNS)
- return NULL;
-
- if (s->link)
- return link_get_dns_server(s->link);
- else
- return manager_get_dns_server(s->manager);
-}
-
-void dns_scope_next_dns_server(DnsScope *s) {
- assert(s);
-
- if (s->protocol != DNS_PROTOCOL_DNS)
- return;
-
- if (s->link)
- link_next_dns_server(s->link);
- else
- manager_next_dns_server(s->manager);
-}
-
-int dns_scope_emit(DnsScope *s, DnsPacket *p) {
- union in_addr_union addr;
- int ifindex = 0, r;
- int family;
- uint16_t port;
- uint32_t mtu;
- int fd;
-
- assert(s);
- assert(p);
- assert(p->protocol == s->protocol);
-
- if (s->link) {
- mtu = s->link->mtu;
- ifindex = s->link->ifindex;
- } else
- mtu = manager_find_mtu(s->manager);
-
- if (s->protocol == DNS_PROTOCOL_DNS) {
- DnsServer *srv;
-
- if (DNS_PACKET_QDCOUNT(p) > 1)
- return -EOPNOTSUPP;
-
- srv = dns_scope_get_dns_server(s);
- if (!srv)
- return -ESRCH;
-
- family = srv->family;
- addr = srv->address;
- port = 53;
-
- if (p->size > DNS_PACKET_UNICAST_SIZE_MAX)
- return -EMSGSIZE;
-
- if (p->size > mtu)
- return -EMSGSIZE;
-
- if (family == AF_INET)
- fd = manager_dns_ipv4_fd(s->manager);
- else if (family == AF_INET6)
- fd = manager_dns_ipv6_fd(s->manager);
- else
- return -EAFNOSUPPORT;
- if (fd < 0)
- return fd;
-
- } else if (s->protocol == DNS_PROTOCOL_LLMNR) {
-
- if (DNS_PACKET_QDCOUNT(p) > 1)
- return -EOPNOTSUPP;
-
- if (!ratelimit_test(&s->ratelimit))
- return -EBUSY;
-
- family = s->family;
- port = 5355;
-
- if (family == AF_INET) {
- addr.in = LLMNR_MULTICAST_IPV4_ADDRESS;
- fd = manager_llmnr_ipv4_udp_fd(s->manager);
- } else if (family == AF_INET6) {
- addr.in6 = LLMNR_MULTICAST_IPV6_ADDRESS;
- fd = manager_llmnr_ipv6_udp_fd(s->manager);
- } else
- return -EAFNOSUPPORT;
- if (fd < 0)
- return fd;
- } else
- return -EAFNOSUPPORT;
-
- r = manager_send(s->manager, fd, ifindex, family, &addr, port, p);
- if (r < 0)
- return r;
-
- return 1;
-}
-
-int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *address, uint16_t port) {
- _cleanup_close_ int fd = -1;
- union sockaddr_union sa = {};
- socklen_t salen;
- static const int one = 1;
- int ret, r;
-
- assert(s);
- assert((family == AF_UNSPEC) == !address);
-
- if (family == AF_UNSPEC) {
- DnsServer *srv;
-
- srv = dns_scope_get_dns_server(s);
- if (!srv)
- return -ESRCH;
-
- sa.sa.sa_family = srv->family;
- if (srv->family == AF_INET) {
- sa.in.sin_port = htobe16(port);
- sa.in.sin_addr = srv->address.in;
- salen = sizeof(sa.in);
- } else if (srv->family == AF_INET6) {
- sa.in6.sin6_port = htobe16(port);
- sa.in6.sin6_addr = srv->address.in6;
- sa.in6.sin6_scope_id = s->link ? s->link->ifindex : 0;
- salen = sizeof(sa.in6);
- } else
- return -EAFNOSUPPORT;
- } else {
- sa.sa.sa_family = family;
-
- if (family == AF_INET) {
- sa.in.sin_port = htobe16(port);
- sa.in.sin_addr = address->in;
- salen = sizeof(sa.in);
- } else if (family == AF_INET6) {
- sa.in6.sin6_port = htobe16(port);
- sa.in6.sin6_addr = address->in6;
- sa.in6.sin6_scope_id = s->link ? s->link->ifindex : 0;
- salen = sizeof(sa.in6);
- } else
- return -EAFNOSUPPORT;
- }
-
- fd = socket(sa.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
- if (fd < 0)
- return -errno;
-
- r = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
- if (r < 0)
- return -errno;
-
- if (s->link) {
- uint32_t ifindex = htobe32(s->link->ifindex);
-
- if (sa.sa.sa_family == AF_INET) {
- r = setsockopt(fd, IPPROTO_IP, IP_UNICAST_IF, &ifindex, sizeof(ifindex));
- if (r < 0)
- return -errno;
- } else if (sa.sa.sa_family == AF_INET6) {
- r = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_IF, &ifindex, sizeof(ifindex));
- if (r < 0)
- return -errno;
- }
- }
-
- if (s->protocol == DNS_PROTOCOL_LLMNR) {
- /* RFC 4795, section 2.5 requires the TTL to be set to 1 */
-
- if (sa.sa.sa_family == AF_INET) {
- r = setsockopt(fd, IPPROTO_IP, IP_TTL, &one, sizeof(one));
- if (r < 0)
- return -errno;
- } else if (sa.sa.sa_family == AF_INET6) {
- r = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one));
- if (r < 0)
- return -errno;
- }
- }
-
- r = connect(fd, &sa.sa, salen);
- if (r < 0 && errno != EINPROGRESS)
- return -errno;
-
- ret = fd;
- fd = -1;
-
- return ret;
-}
-
-DnsScopeMatch dns_scope_good_domain(DnsScope *s, int ifindex, uint64_t flags, const char *domain) {
- char **i;
-
- assert(s);
- assert(domain);
-
- if (ifindex != 0 && (!s->link || s->link->ifindex != ifindex))
- return DNS_SCOPE_NO;
-
- if ((SD_RESOLVED_FLAGS_MAKE(s->protocol, s->family) & flags) == 0)
- return DNS_SCOPE_NO;
-
- STRV_FOREACH(i, s->domains)
- if (dns_name_endswith(domain, *i) > 0)
- return DNS_SCOPE_YES;
-
- if (dns_name_root(domain) != 0)
- return DNS_SCOPE_NO;
-
- if (is_localhost(domain))
- return DNS_SCOPE_NO;
-
- if (s->protocol == DNS_PROTOCOL_DNS) {
- if (dns_name_endswith(domain, "254.169.in-addr.arpa") == 0 &&
- dns_name_endswith(domain, "0.8.e.f.ip6.arpa") == 0 &&
- dns_name_single_label(domain) == 0)
- return DNS_SCOPE_MAYBE;
-
- return DNS_SCOPE_NO;
- }
-
- if (s->protocol == DNS_PROTOCOL_MDNS) {
- if (dns_name_endswith(domain, "254.169.in-addr.arpa") > 0 ||
- dns_name_endswith(domain, "0.8.e.f.ip6.arpa") > 0 ||
- (dns_name_endswith(domain, "local") > 0 && dns_name_equal(domain, "local") == 0))
- return DNS_SCOPE_MAYBE;
-
- return DNS_SCOPE_NO;
- }
-
- if (s->protocol == DNS_PROTOCOL_LLMNR) {
- if (dns_name_endswith(domain, "in-addr.arpa") > 0 ||
- dns_name_endswith(domain, "ip6.arpa") > 0 ||
- (dns_name_single_label(domain) > 0 &&
- dns_name_equal(domain, "gateway") <= 0)) /* don't resolve "gateway" with LLMNR, let nss-myhostname handle this */
- return DNS_SCOPE_MAYBE;
-
- return DNS_SCOPE_NO;
- }
-
- assert_not_reached("Unknown scope protocol");
-}
-
-int dns_scope_good_key(DnsScope *s, DnsResourceKey *key) {
- assert(s);
- assert(key);
-
- if (s->protocol == DNS_PROTOCOL_DNS)
- return true;
-
- /* On mDNS and LLMNR, send A and AAAA queries only on the
- * respective scopes */
-
- if (s->family == AF_INET && key->class == DNS_CLASS_IN && key->type == DNS_TYPE_AAAA)
- return false;
-
- if (s->family == AF_INET6 && key->class == DNS_CLASS_IN && key->type == DNS_TYPE_A)
- return false;
-
- return true;
-}
-
-int dns_scope_llmnr_membership(DnsScope *s, bool b) {
- int fd;
-
- assert(s);
-
- if (s->protocol != DNS_PROTOCOL_LLMNR)
- return 0;
-
- assert(s->link);
-
- if (s->family == AF_INET) {
- struct ip_mreqn mreqn = {
- .imr_multiaddr = LLMNR_MULTICAST_IPV4_ADDRESS,
- .imr_ifindex = s->link->ifindex,
- };
-
- fd = manager_llmnr_ipv4_udp_fd(s->manager);
- if (fd < 0)
- return fd;
-
- /* Always first try to drop membership before we add
- * one. This is necessary on some devices, such as
- * veth. */
- if (b)
- (void) setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreqn, sizeof(mreqn));
-
- if (setsockopt(fd, IPPROTO_IP, b ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP, &mreqn, sizeof(mreqn)) < 0)
- return -errno;
-
- } else if (s->family == AF_INET6) {
- struct ipv6_mreq mreq = {
- .ipv6mr_multiaddr = LLMNR_MULTICAST_IPV6_ADDRESS,
- .ipv6mr_interface = s->link->ifindex,
- };
-
- fd = manager_llmnr_ipv6_udp_fd(s->manager);
- if (fd < 0)
- return fd;
-
- if (b)
- (void) setsockopt(fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq, sizeof(mreq));
-
- if (setsockopt(fd, IPPROTO_IPV6, b ? IPV6_ADD_MEMBERSHIP : IPV6_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0)
- return -errno;
- } else
- return -EAFNOSUPPORT;
-
- return 0;
-}
-
-int dns_scope_good_dns_server(DnsScope *s, int family, const union in_addr_union *address) {
- assert(s);
- assert(address);
-
- if (s->protocol != DNS_PROTOCOL_DNS)
- return 1;
-
- if (s->link)
- return !!link_find_dns_server(s->link, family, address);
- else
- return !!manager_find_dns_server(s->manager, family, address);
-}
-
-static int dns_scope_make_reply_packet(
- DnsScope *s,
- uint16_t id,
- int rcode,
- DnsQuestion *q,
- DnsAnswer *answer,
- DnsAnswer *soa,
- bool tentative,
- DnsPacket **ret) {
-
- _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
- unsigned i;
- int r;
-
- assert(s);
- assert(ret);
-
- if ((!q || q->n_keys <= 0)
- && (!answer || answer->n_rrs <= 0)
- && (!soa || soa->n_rrs <= 0))
- return -EINVAL;
-
- r = dns_packet_new(&p, s->protocol, 0);
- if (r < 0)
- return r;
-
- DNS_PACKET_HEADER(p)->id = id;
- DNS_PACKET_HEADER(p)->flags = htobe16(DNS_PACKET_MAKE_FLAGS(
- 1 /* qr */,
- 0 /* opcode */,
- 0 /* c */,
- 0 /* tc */,
- tentative,
- 0 /* (ra) */,
- 0 /* (ad) */,
- 0 /* (cd) */,
- rcode));
-
- if (q) {
- for (i = 0; i < q->n_keys; i++) {
- r = dns_packet_append_key(p, q->keys[i], NULL);
- if (r < 0)
- return r;
- }
-
- DNS_PACKET_HEADER(p)->qdcount = htobe16(q->n_keys);
- }
-
- if (answer) {
- for (i = 0; i < answer->n_rrs; i++) {
- r = dns_packet_append_rr(p, answer->rrs[i], NULL);
- if (r < 0)
- return r;
- }
-
- DNS_PACKET_HEADER(p)->ancount = htobe16(answer->n_rrs);
- }
-
- if (soa) {
- for (i = 0; i < soa->n_rrs; i++) {
- r = dns_packet_append_rr(p, soa->rrs[i], NULL);
- if (r < 0)
- return r;
- }
-
- DNS_PACKET_HEADER(p)->arcount = htobe16(soa->n_rrs);
- }
-
- *ret = p;
- p = NULL;
-
- return 0;
-}
-
-static void dns_scope_verify_conflicts(DnsScope *s, DnsPacket *p) {
- unsigned n;
-
- assert(s);
- assert(p);
-
- if (p->question)
- for (n = 0; n < p->question->n_keys; n++)
- dns_zone_verify_conflicts(&s->zone, p->question->keys[n]);
- if (p->answer)
- for (n = 0; n < p->answer->n_rrs; n++)
- dns_zone_verify_conflicts(&s->zone, p->answer->rrs[n]->key);
-}
-
-void dns_scope_process_query(DnsScope *s, DnsStream *stream, DnsPacket *p) {
- _cleanup_(dns_packet_unrefp) DnsPacket *reply = NULL;
- _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL, *soa = NULL;
- bool tentative = false;
- int r, fd;
-
- assert(s);
- assert(p);
-
- if (p->protocol != DNS_PROTOCOL_LLMNR)
- return;
-
- if (p->ipproto == IPPROTO_UDP) {
- /* Don't accept UDP queries directed to anything but
- * the LLMNR multicast addresses. See RFC 4795,
- * section 2.5. */
-
- if (p->family == AF_INET && !in_addr_equal(AF_INET, &p->destination, (union in_addr_union*) &LLMNR_MULTICAST_IPV4_ADDRESS))
- return;
-
- if (p->family == AF_INET6 && !in_addr_equal(AF_INET6, &p->destination, (union in_addr_union*) &LLMNR_MULTICAST_IPV6_ADDRESS))
- return;
- }
-
- r = dns_packet_extract(p);
- if (r < 0) {
- log_debug_errno(r, "Failed to extract resources from incoming packet: %m");
- return;
- }
-
- if (DNS_PACKET_C(p)) {
- /* Somebody notified us about a possible conflict */
- dns_scope_verify_conflicts(s, p);
- return;
- }
-
- r = dns_zone_lookup(&s->zone, p->question, &answer, &soa, &tentative);
- if (r < 0) {
- log_debug_errno(r, "Failed to lookup key: %m");
- return;
- }
- if (r == 0)
- return;
-
- if (answer)
- dns_answer_order_by_scope(answer, in_addr_is_link_local(p->family, &p->sender) > 0);
-
- r = dns_scope_make_reply_packet(s, DNS_PACKET_ID(p), DNS_RCODE_SUCCESS, p->question, answer, soa, tentative, &reply);
- if (r < 0) {
- log_debug_errno(r, "Failed to build reply packet: %m");
- return;
- }
-
- if (stream)
- r = dns_stream_write_packet(stream, reply);
- else {
- if (!ratelimit_test(&s->ratelimit))
- return;
-
- if (p->family == AF_INET)
- fd = manager_llmnr_ipv4_udp_fd(s->manager);
- else if (p->family == AF_INET6)
- fd = manager_llmnr_ipv6_udp_fd(s->manager);
- else {
- log_debug("Unknown protocol");
- return;
- }
- if (fd < 0) {
- log_debug_errno(fd, "Failed to get reply socket: %m");
- return;
- }
-
- /* Note that we always immediately reply to all LLMNR
- * requests, and do not wait any time, since we
- * verified uniqueness for all records. Also see RFC
- * 4795, Section 2.7 */
-
- r = manager_send(s->manager, fd, p->ifindex, p->family, &p->sender, p->sender_port, reply);
- }
-
- if (r < 0) {
- log_debug_errno(r, "Failed to send reply packet: %m");
- return;
- }
-}
-
-DnsTransaction *dns_scope_find_transaction(DnsScope *scope, DnsQuestion *question, bool cache_ok) {
- DnsTransaction *t;
-
- assert(scope);
- assert(question);
-
- /* Try to find an ongoing transaction that is a equal or a
- * superset of the specified question */
-
- LIST_FOREACH(transactions_by_scope, t, scope->transactions) {
-
- /* Refuse reusing transactions that completed based on
- * cached data instead of a real packet, if that's
- * requested. */
- if (!cache_ok &&
- IN_SET(t->state, DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_FAILURE) &&
- !t->received)
- continue;
-
- if (dns_question_is_superset(t->question, question) > 0)
- return t;
- }
-
- return NULL;
-}
-
-static int dns_scope_make_conflict_packet(
- DnsScope *s,
- DnsResourceRecord *rr,
- DnsPacket **ret) {
-
- _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
- int r;
-
- assert(s);
- assert(rr);
- assert(ret);
-
- r = dns_packet_new(&p, s->protocol, 0);
- if (r < 0)
- return r;
-
- DNS_PACKET_HEADER(p)->flags = htobe16(DNS_PACKET_MAKE_FLAGS(
- 0 /* qr */,
- 0 /* opcode */,
- 1 /* conflict */,
- 0 /* tc */,
- 0 /* t */,
- 0 /* (ra) */,
- 0 /* (ad) */,
- 0 /* (cd) */,
- 0));
- random_bytes(&DNS_PACKET_HEADER(p)->id, sizeof(uint16_t));
- DNS_PACKET_HEADER(p)->qdcount = htobe16(1);
- DNS_PACKET_HEADER(p)->arcount = htobe16(1);
-
- r = dns_packet_append_key(p, rr->key, NULL);
- if (r < 0)
- return r;
-
- r = dns_packet_append_rr(p, rr, NULL);
- if (r < 0)
- return r;
-
- *ret = p;
- p = NULL;
-
- return 0;
-}
-
-static int on_conflict_dispatch(sd_event_source *es, usec_t usec, void *userdata) {
- DnsScope *scope = userdata;
- int r;
-
- assert(es);
- assert(scope);
-
- scope->conflict_event_source = sd_event_source_unref(scope->conflict_event_source);
-
- for (;;) {
- _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
- _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
-
- rr = ordered_hashmap_steal_first(scope->conflict_queue);
- if (!rr)
- break;
-
- r = dns_scope_make_conflict_packet(scope, rr, &p);
- if (r < 0) {
- log_error_errno(r, "Failed to make conflict packet: %m");
- return 0;
- }
-
- r = dns_scope_emit(scope, p);
- if (r < 0)
- log_debug_errno(r, "Failed to send conflict packet: %m");
- }
-
- return 0;
-}
-
-int dns_scope_notify_conflict(DnsScope *scope, DnsResourceRecord *rr) {
- usec_t jitter;
- int r;
-
- assert(scope);
- assert(rr);
-
- /* We don't send these queries immediately. Instead, we queue
- * them, and send them after some jitter delay. */
- r = ordered_hashmap_ensure_allocated(&scope->conflict_queue, &dns_resource_key_hash_ops);
- if (r < 0) {
- log_oom();
- return r;
- }
-
- /* We only place one RR per key in the conflict
- * messages, not all of them. That should be enough to
- * indicate where there might be a conflict */
- r = ordered_hashmap_put(scope->conflict_queue, rr->key, rr);
- if (r == -EEXIST || r == 0)
- return 0;
- if (r < 0)
- return log_debug_errno(r, "Failed to queue conflicting RR: %m");
-
- dns_resource_record_ref(rr);
-
- if (scope->conflict_event_source)
- return 0;
-
- random_bytes(&jitter, sizeof(jitter));
- jitter %= LLMNR_JITTER_INTERVAL_USEC;
-
- r = sd_event_add_time(scope->manager->event,
- &scope->conflict_event_source,
- clock_boottime_or_monotonic(),
- now(clock_boottime_or_monotonic()) + jitter,
- LLMNR_JITTER_INTERVAL_USEC,
- on_conflict_dispatch, scope);
- if (r < 0)
- return log_debug_errno(r, "Failed to add conflict dispatch event: %m");
-
- return 0;
-}
-
-void dns_scope_check_conflicts(DnsScope *scope, DnsPacket *p) {
- unsigned i;
- int r;
-
- assert(scope);
- assert(p);
-
- if (p->protocol != DNS_PROTOCOL_LLMNR)
- return;
-
- if (DNS_PACKET_RRCOUNT(p) <= 0)
- return;
-
- if (DNS_PACKET_C(p) != 0)
- return;
-
- if (DNS_PACKET_T(p) != 0)
- return;
-
- if (manager_our_packet(scope->manager, p))
- return;
-
- r = dns_packet_extract(p);
- if (r < 0) {
- log_debug_errno(r, "Failed to extract packet: %m");
- return;
- }
-
- log_debug("Checking for conflicts...");
-
- for (i = 0; i < p->answer->n_rrs; i++) {
-
- /* Check for conflicts against the local zone. If we
- * found one, we won't check any further */
- r = dns_zone_check_conflicts(&scope->zone, p->answer->rrs[i]);
- if (r != 0)
- continue;
-
- /* Check for conflicts against the local cache. If so,
- * send out an advisory query, to inform everybody */
- r = dns_cache_check_conflicts(&scope->cache, p->answer->rrs[i], p->family, &p->sender);
- if (r <= 0)
- continue;
-
- dns_scope_notify_conflict(scope, p->answer->rrs[i]);
- }
-}