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Merge pull request #5335 from poettering/resolved-some-fixes

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some post-mdns fixes for resolved
This commit is contained in:
Lennart Poettering 2017-02-14 15:09:43 +01:00 committed by GitHub
commit 4ec426b975
6 changed files with 49 additions and 39 deletions
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58
src/resolve/resolved-dns-scope.c
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@ -793,15 +793,8 @@ DnsTransaction *dns_scope_find_transaction(DnsScope *scope, DnsResourceKey *key,
/* Try to find an ongoing transaction that is a equal to the
* specified question */
t = hashmap_get(scope->transactions_by_key, key);
if (!t) {
DnsResourceKey *key_any;
key_any = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_ANY, dns_resource_key_name(key));
t = hashmap_get(scope->transactions_by_key, key_any);
key_any = dns_resource_key_unref(key_any);
if (!t)
return NULL;
}
if (!t)
return NULL;
/* Refuse reusing transactions that completed based on cached
* data instead of a real packet, if that's requested. */
@ -1068,49 +1061,46 @@ static int on_announcement_timeout(sd_event_source *s, usec_t usec, void *userda
scope->announce_event_source = sd_event_source_unref(scope->announce_event_source);
dns_scope_announce(scope, false);
(void) dns_scope_announce(scope, false);
return 0;
}
void dns_scope_announce(DnsScope *scope, bool goodbye) {
int dns_scope_announce(DnsScope *scope, bool goodbye) {
_cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
LinkAddress *a;
int r;
if (!scope)
return;
return 0;
if (scope->protocol != DNS_PROTOCOL_MDNS)
return;
return 0;
answer = dns_answer_new(scope->link->n_addresses * 2);
if (!answer)
return log_oom();
answer = dns_answer_new(4);
LIST_FOREACH(addresses, a, scope->link->addresses) {
r = dns_answer_add(answer, a->mdns_address_rr, 0, goodbye ? DNS_ANSWER_GOODBYE : DNS_ANSWER_CACHE_FLUSH);
if (r < 0) {
log_debug_errno(r, "Failed to add address RR to answer: %m");
return;
}
if (r < 0)
return log_debug_errno(r, "Failed to add address RR to answer: %m");
r = dns_answer_add(answer, a->mdns_ptr_rr, 0, goodbye ? DNS_ANSWER_GOODBYE : DNS_ANSWER_CACHE_FLUSH);
if (r < 0) {
log_debug_errno(r, "Failed to add PTR RR to answer: %m");
return;
}
if (r < 0)
return log_debug_errno(r, "Failed to add PTR RR to answer: %m");
}
if (dns_answer_isempty(answer))
return;
return 0;
r = dns_scope_make_reply_packet(scope, 0, DNS_RCODE_SUCCESS, NULL, answer, NULL, false, &p);
if (r < 0) {
log_debug_errno(r, "Failed to build reply packet: %m");
return;
}
if (r < 0)
return log_debug_errno(r, "Failed to build reply packet: %m");
r = dns_scope_emit_udp(scope, -1, p);
if (r < 0) {
log_debug_errno(r, "Failed to send reply packet: %m");
return;
}
if (r < 0)
return log_debug_errno(r, "Failed to send reply packet: %m");
/* In section 8.3 of RFC6762: "The Multicast DNS responder MUST send at least two unsolicited
* responses, one second apart." */
@ -1130,6 +1120,10 @@ void dns_scope_announce(DnsScope *scope, bool goodbye) {
MDNS_JITTER_RANGE_USEC,
on_announcement_timeout, scope);
if (r < 0)
log_debug_errno(r, "Failed to schedule second announcement: %m");
return log_debug_errno(r, "Failed to schedule second announcement: %m");
(void) sd_event_source_set_description(scope->announce_event_source, "mdns-announce");
}
return 0;
}

2
src/resolve/resolved-dns-scope.h
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@ -117,4 +117,4 @@ bool dns_scope_network_good(DnsScope *s);
int dns_scope_ifindex(DnsScope *s);
void dns_scope_announce(DnsScope *scope, bool goodbye);
int dns_scope_announce(DnsScope *scope, bool goodbye);

2
src/resolve/resolved-dns-transaction.c
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@ -364,7 +364,7 @@ void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state) {
dns_zone_item_notify(z);
SWAP_TWO(t->notify_zone_items, t->notify_zone_items_done);
if (t->probing)
dns_scope_announce(t->scope, false);
(void) dns_scope_announce(t->scope, false);
SET_FOREACH_MOVE(d, t->notify_transactions_done, t->notify_transactions)
dns_transaction_notify(d, t);

4
src/resolve/resolved-link.c
View File

@ -669,6 +669,7 @@ int link_address_new(Link *l, LinkAddress **ret, int family, const union in_addr
a->link = l;
LIST_PREPEND(addresses, l->addresses, a);
l->n_addresses++;
if (ret)
*ret = a;
@ -683,6 +684,9 @@ LinkAddress *link_address_free(LinkAddress *a) {
if (a->link) {
LIST_REMOVE(addresses, a->link->addresses, a);
assert(a->link->n_addresses > 0);
a->link->n_addresses--;
if (a->llmnr_address_rr) {
if (a->family == AF_INET && a->link->llmnr_ipv4_scope)
dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_address_rr);

1
src/resolve/resolved-link.h
View File

@ -60,6 +60,7 @@ struct Link {
unsigned flags;
LIST_HEAD(LinkAddress, addresses);
unsigned n_addresses;
LIST_HEAD(DnsServer, dns_servers);
DnsServer *current_dns_server;

21
src/resolve/resolved-mdns.c
View File

@ -78,10 +78,8 @@ static int mdns_scope_process_query(DnsScope *s, DnsPacket *p) {
assert(p);
r = dns_packet_extract(p);
if (r < 0) {
log_debug_errno(r, "Failed to extract resource records from incoming packet: %m");
return r;
}
if (r < 0)
return log_debug_errno(r, "Failed to extract resource records from incoming packet: %m");
/* TODO: there might be more than one question in mDNS queries. */
assert_return((dns_question_size(p->question) > 0), -EINVAL);
@ -173,6 +171,19 @@ static int on_mdns_packet(sd_event_source *s, int fd, uint32_t revents, void *us
t = dns_scope_find_transaction(scope, rr->key, false);
if (t)
dns_transaction_process_reply(t, p);
/* Also look for the various types of ANY transactions */
t = dns_scope_find_transaction(scope, &DNS_RESOURCE_KEY_CONST(rr->key->class, DNS_TYPE_ANY, dns_resource_key_name(rr->key)), false);
if (t)
dns_transaction_process_reply(t, p);
t = dns_scope_find_transaction(scope, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_ANY, rr->key->type, dns_resource_key_name(rr->key)), false);
if (t)
dns_transaction_process_reply(t, p);
t = dns_scope_find_transaction(scope, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_ANY, DNS_TYPE_ANY, dns_resource_key_name(rr->key)), false);
if (t)
dns_transaction_process_reply(t, p);
}
dns_cache_put(&scope->cache, NULL, DNS_PACKET_RCODE(p), p->answer, false, (uint32_t) -1, 0, p->family, &p->sender);
@ -182,7 +193,7 @@ static int on_mdns_packet(sd_event_source *s, int fd, uint32_t revents, void *us
r = mdns_scope_process_query(scope, p);
if (r < 0) {
log_debug("mDNS query processing failed.");
log_debug_errno(r, "mDNS query processing failed: %m");
return 0;
}
} else