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Diffstat (limited to 'src/resolve/resolved-dns-query.c')
-rw-r--r--src/resolve/resolved-dns-query.c267
1 files changed, 207 insertions, 60 deletions
diff --git a/src/resolve/resolved-dns-query.c b/src/resolve/resolved-dns-query.c
index 610b914e74..fc5bf4020f 100644
--- a/src/resolve/resolved-dns-query.c
+++ b/src/resolve/resolved-dns-query.c
@@ -24,6 +24,7 @@
#include "hostname-util.h"
#include "local-addresses.h"
#include "resolved-dns-query.h"
+#include "string-util.h"
/* How long to wait for the query in total */
#define QUERY_TIMEOUT_USEC (30 * USEC_PER_SEC)
@@ -217,6 +218,7 @@ static DnsTransactionState dns_query_candidate_state(DnsQueryCandidate *c) {
}
static int dns_query_candidate_setup_transactions(DnsQueryCandidate *c) {
+ DnsQuestion *question;
DnsResourceKey *key;
int n = 0, r;
@@ -224,8 +226,10 @@ static int dns_query_candidate_setup_transactions(DnsQueryCandidate *c) {
dns_query_candidate_stop(c);
+ question = dns_query_question_for_protocol(c->query, c->scope->protocol);
+
/* Create one transaction per question key */
- DNS_QUESTION_FOREACH(key, c->query->question) {
+ DNS_QUESTION_FOREACH(key, question) {
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *new_key = NULL;
if (c->search_domain) {
@@ -305,6 +309,25 @@ static void dns_query_stop(DnsQuery *q) {
dns_query_candidate_stop(c);
}
+static void dns_query_free_candidates(DnsQuery *q) {
+ assert(q);
+
+ while (q->candidates)
+ dns_query_candidate_free(q->candidates);
+}
+
+static void dns_query_reset_answer(DnsQuery *q) {
+ assert(q);
+
+ q->answer = dns_answer_unref(q->answer);
+ q->answer_rcode = 0;
+ q->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
+ q->answer_authenticated = false;
+ q->answer_protocol = _DNS_PROTOCOL_INVALID;
+ q->answer_family = AF_UNSPEC;
+ q->answer_search_domain = dns_search_domain_unref(q->answer_search_domain);
+}
+
DnsQuery *dns_query_free(DnsQuery *q) {
if (!q)
return NULL;
@@ -318,16 +341,18 @@ DnsQuery *dns_query_free(DnsQuery *q) {
LIST_REMOVE(auxiliary_queries, q->auxiliary_for->auxiliary_queries, q);
}
- while (q->candidates)
- dns_query_candidate_free(q->candidates);
+ dns_query_free_candidates(q);
- dns_question_unref(q->question);
- dns_answer_unref(q->answer);
- dns_search_domain_unref(q->answer_search_domain);
+ dns_question_unref(q->question_idna);
+ dns_question_unref(q->question_utf8);
+
+ dns_query_reset_answer(q);
sd_bus_message_unref(q->request);
sd_bus_track_unref(q->bus_track);
+ free(q->request_address_string);
+
if (q->manager) {
LIST_REMOVE(queries, q->manager->dns_queries, q);
q->manager->n_dns_queries--;
@@ -338,17 +363,50 @@ DnsQuery *dns_query_free(DnsQuery *q) {
return NULL;
}
-int dns_query_new(Manager *m, DnsQuery **ret, DnsQuestion *question, int ifindex, uint64_t flags) {
+int dns_query_new(
+ Manager *m,
+ DnsQuery **ret,
+ DnsQuestion *question_utf8,
+ DnsQuestion *question_idna,
+ int ifindex, uint64_t flags) {
+
_cleanup_(dns_query_freep) DnsQuery *q = NULL;
- unsigned i;
+ DnsResourceKey *key;
+ bool good = false;
int r;
assert(m);
- assert(question);
- r = dns_question_is_valid_for_query(question);
+ if (dns_question_size(question_utf8) > 0) {
+ r = dns_question_is_valid_for_query(question_utf8);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -EINVAL;
+
+ good = true;
+ }
+
+ /* If the IDNA and UTF8 questions are the same, merge their references */
+ r = dns_question_is_equal(question_idna, question_utf8);
if (r < 0)
return r;
+ if (r > 0)
+ question_idna = question_utf8;
+ else {
+ if (dns_question_size(question_idna) > 0) {
+ r = dns_question_is_valid_for_query(question_idna);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -EINVAL;
+
+ good = true;
+ }
+ }
+
+ if (!good) /* don't allow empty queries */
+ return -EINVAL;
if (m->n_dns_queries >= QUERIES_MAX)
return -EBUSY;
@@ -357,20 +415,40 @@ int dns_query_new(Manager *m, DnsQuery **ret, DnsQuestion *question, int ifindex
if (!q)
return -ENOMEM;
- q->question = dns_question_ref(question);
+ q->question_utf8 = dns_question_ref(question_utf8);
+ q->question_idna = dns_question_ref(question_idna);
q->ifindex = ifindex;
q->flags = flags;
- q->answer_family = AF_UNSPEC;
+ q->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
q->answer_protocol = _DNS_PROTOCOL_INVALID;
+ q->answer_family = AF_UNSPEC;
+
+ /* First dump UTF8 question */
+ DNS_QUESTION_FOREACH(key, question_utf8) {
+ _cleanup_free_ char *p = NULL;
- for (i = 0; i < question->n_keys; i++) {
- _cleanup_free_ char *p;
+ r = dns_resource_key_to_string(key, &p);
+ if (r < 0)
+ return r;
+
+ log_debug("Looking up RR for %s.", strstrip(p));
+ }
+
+ /* And then dump the IDNA question, but only what hasn't been dumped already through the UTF8 question. */
+ DNS_QUESTION_FOREACH(key, question_idna) {
+ _cleanup_free_ char *p = NULL;
+
+ r = dns_question_contains(question_utf8, key);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ continue;
- r = dns_resource_key_to_string(question->keys[i], &p);
+ r = dns_resource_key_to_string(key, &p);
if (r < 0)
return r;
- log_debug("Looking up RR for %s", p);
+ log_debug("Looking up IDNA RR for %s.", strstrip(p));
}
LIST_PREPEND(queries, m->dns_queries, q);
@@ -446,7 +524,7 @@ static int dns_query_add_candidate(DnsQuery *q, DnsScope *s) {
/* If this a single-label domain on DNS, we might append a suitable search domain first. */
if ((q->flags & SD_RESOLVED_NO_SEARCH) == 0) {
- r = dns_scope_name_needs_search_domain(s, dns_question_first_name(q->question));
+ r = dns_scope_name_needs_search_domain(s, dns_question_first_name(q->question_idna));
if (r < 0)
goto fail;
if (r > 0) {
@@ -534,7 +612,7 @@ static int dns_type_to_af(uint16_t t) {
}
}
-static int synthesize_localhost_rr(DnsQuery *q, DnsResourceKey *key, DnsAnswer **answer) {
+static int synthesize_localhost_rr(DnsQuery *q, const DnsResourceKey *key, DnsAnswer **answer) {
int r;
assert(q);
@@ -590,7 +668,7 @@ static int answer_add_ptr(DnsAnswer **answer, const char *from, const char *to,
return dns_answer_add(*answer, rr, ifindex, flags);
}
-static int synthesize_localhost_ptr(DnsQuery *q, DnsResourceKey *key, DnsAnswer **answer) {
+static int synthesize_localhost_ptr(DnsQuery *q, const DnsResourceKey *key, DnsAnswer **answer) {
int r;
assert(q);
@@ -682,7 +760,7 @@ static int answer_add_addresses_ptr(
return 0;
}
-static int synthesize_system_hostname_rr(DnsQuery *q, DnsResourceKey *key, DnsAnswer **answer) {
+static int synthesize_system_hostname_rr(DnsQuery *q, const DnsResourceKey *key, DnsAnswer **answer) {
_cleanup_free_ struct local_address *addresses = NULL;
int n = 0, af;
@@ -766,7 +844,7 @@ static int synthesize_system_hostname_ptr(DnsQuery *q, int af, const union in_ad
return answer_add_addresses_ptr(answer, q->manager->mdns_hostname, addresses, n, af, address);
}
-static int synthesize_gateway_rr(DnsQuery *q, DnsResourceKey *key, DnsAnswer **answer) {
+static int synthesize_gateway_rr(DnsQuery *q, const DnsResourceKey *key, DnsAnswer **answer) {
_cleanup_free_ struct local_address *addresses = NULL;
int n = 0, af;
@@ -801,7 +879,7 @@ static int synthesize_gateway_ptr(DnsQuery *q, int af, const union in_addr_union
static int dns_query_synthesize_reply(DnsQuery *q, DnsTransactionState *state) {
_cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
- unsigned i;
+ DnsResourceKey *key;
int r;
assert(q);
@@ -816,39 +894,39 @@ static int dns_query_synthesize_reply(DnsQuery *q, DnsTransactionState *state) {
DNS_TRANSACTION_ATTEMPTS_MAX_REACHED))
return 0;
- for (i = 0; i < q->question->n_keys; i++) {
+ DNS_QUESTION_FOREACH(key, q->question_utf8) {
union in_addr_union address;
const char *name;
int af;
- if (q->question->keys[i]->class != DNS_CLASS_IN &&
- q->question->keys[i]->class != DNS_CLASS_ANY)
+ if (key->class != DNS_CLASS_IN &&
+ key->class != DNS_CLASS_ANY)
continue;
- name = DNS_RESOURCE_KEY_NAME(q->question->keys[i]);
+ name = DNS_RESOURCE_KEY_NAME(key);
if (is_localhost(name)) {
- r = synthesize_localhost_rr(q, q->question->keys[i], &answer);
+ r = synthesize_localhost_rr(q, key, &answer);
if (r < 0)
return log_error_errno(r, "Failed to synthesize localhost RRs: %m");
} else if (manager_is_own_hostname(q->manager, name)) {
- r = synthesize_system_hostname_rr(q, q->question->keys[i], &answer);
+ r = synthesize_system_hostname_rr(q, key, &answer);
if (r < 0)
return log_error_errno(r, "Failed to synthesize system hostname RRs: %m");
} else if (is_gateway_hostname(name)) {
- r = synthesize_gateway_rr(q, q->question->keys[i], &answer);
+ r = synthesize_gateway_rr(q, key, &answer);
if (r < 0)
return log_error_errno(r, "Failed to synthesize gateway RRs: %m");
} else if ((dns_name_endswith(name, "127.in-addr.arpa") > 0 && dns_name_equal(name, "2.0.0.127.in-addr.arpa") == 0) ||
dns_name_equal(name, "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa") > 0) {
- r = synthesize_localhost_ptr(q, q->question->keys[i], &answer);
+ r = synthesize_localhost_ptr(q, key, &answer);
if (r < 0)
return log_error_errno(r, "Failed to synthesize localhost PTR RRs: %m");
@@ -884,7 +962,6 @@ int dns_query_go(DnsQuery *q) {
DnsScopeMatch found = DNS_SCOPE_NO;
DnsScope *s, *first = NULL;
DnsQueryCandidate *c;
- const char *name;
int r;
assert(q);
@@ -892,13 +969,13 @@ int dns_query_go(DnsQuery *q) {
if (q->state != DNS_TRANSACTION_NULL)
return 0;
- assert(q->question);
- assert(q->question->n_keys > 0);
-
- name = dns_question_first_name(q->question);
-
LIST_FOREACH(scopes, s, q->manager->dns_scopes) {
DnsScopeMatch match;
+ const char *name;
+
+ name = dns_question_first_name(dns_query_question_for_protocol(q, s->protocol));
+ if (!name)
+ continue;
match = dns_scope_good_domain(s, q->ifindex, q->flags, name);
if (match < 0)
@@ -934,6 +1011,11 @@ int dns_query_go(DnsQuery *q) {
LIST_FOREACH(scopes, s, first->scopes_next) {
DnsScopeMatch match;
+ const char *name;
+
+ name = dns_question_first_name(dns_query_question_for_protocol(q, s->protocol));
+ if (!name)
+ continue;
match = dns_scope_good_domain(s, q->ifindex, q->flags, name);
if (match < 0)
@@ -961,6 +1043,8 @@ int dns_query_go(DnsQuery *q) {
if (r < 0)
goto fail;
+ (void) sd_event_source_set_description(q->timeout_event_source, "query-timeout");
+
q->state = DNS_TRANSACTION_PENDING;
q->block_ready++;
@@ -1113,50 +1197,78 @@ void dns_query_ready(DnsQuery *q) {
}
static int dns_query_cname_redirect(DnsQuery *q, const DnsResourceRecord *cname) {
- _cleanup_(dns_question_unrefp) DnsQuestion *nq = NULL;
- int r;
+ _cleanup_(dns_question_unrefp) DnsQuestion *nq_idna = NULL, *nq_utf8 = NULL;
+ int r, k;
assert(q);
- log_debug("Following CNAME %s → %s", dns_question_first_name(q->question), cname->cname.name);
-
q->n_cname_redirects ++;
if (q->n_cname_redirects > CNAME_MAX)
return -ELOOP;
- r = dns_question_cname_redirect(q->question, cname, &nq);
+ r = dns_question_cname_redirect(q->question_idna, cname, &nq_idna);
if (r < 0)
return r;
+ else if (r > 0)
+ log_debug("Following CNAME/DNAME %s → %s.", dns_question_first_name(q->question_idna), dns_question_first_name(nq_idna));
- dns_question_unref(q->question);
- q->question = nq;
- nq = NULL;
+ k = dns_question_is_equal(q->question_idna, q->question_utf8);
+ if (k < 0)
+ return r;
+ if (k > 0) {
+ /* Same question? Shortcut new question generation */
+ nq_utf8 = dns_question_ref(nq_idna);
+ k = r;
+ } else {
+ k = dns_question_cname_redirect(q->question_utf8, cname, &nq_utf8);
+ if (k < 0)
+ return k;
+ else if (k > 0)
+ log_debug("Following UTF8 CNAME/DNAME %s → %s.", dns_question_first_name(q->question_utf8), dns_question_first_name(nq_utf8));
+ }
- dns_query_stop(q);
+ if (r == 0 && k == 0) /* No actual cname happened? */
+ return -ELOOP;
+
+ dns_question_unref(q->question_idna);
+ q->question_idna = nq_idna;
+ nq_idna = NULL;
+
+ dns_question_unref(q->question_utf8);
+ q->question_utf8 = nq_utf8;
+ nq_utf8 = NULL;
+
+ dns_query_free_candidates(q);
+ dns_query_reset_answer(q);
q->state = DNS_TRANSACTION_NULL;
+ /* Turn off searching for the new name */
+ q->flags |= SD_RESOLVED_NO_SEARCH;
+
return 0;
}
int dns_query_process_cname(DnsQuery *q) {
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *cname = NULL;
+ DnsQuestion *question;
DnsResourceRecord *rr;
int r;
assert(q);
- if (q->state != DNS_TRANSACTION_SUCCESS)
- return 0;
+ if (!IN_SET(q->state, DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_NULL))
+ return DNS_QUERY_NOMATCH;
- DNS_ANSWER_FOREACH(rr, q->answer) {
+ question = dns_query_question_for_protocol(q, q->answer_protocol);
- r = dns_question_matches_rr(q->question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain));
+ DNS_ANSWER_FOREACH(rr, q->answer) {
+ r = dns_question_matches_rr(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain));
if (r < 0)
return r;
if (r > 0)
- return 0; /* The answer matches directly, no need to follow cnames */
+ return DNS_QUERY_MATCH; /* The answer matches directly, no need to follow cnames */
- r = dns_question_matches_cname(q->question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain));
+ r = dns_question_matches_cname_or_dname(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain));
if (r < 0)
return r;
if (r > 0 && !cname)
@@ -1164,7 +1276,7 @@ int dns_query_process_cname(DnsQuery *q) {
}
if (!cname)
- return 0; /* No cname to follow */
+ return DNS_QUERY_NOMATCH; /* No match and no cname to follow */
if (q->flags & SD_RESOLVED_NO_CNAME)
return -ELOOP;
@@ -1176,20 +1288,16 @@ int dns_query_process_cname(DnsQuery *q) {
/* Let's see if the answer can already answer the new
* redirected question */
- DNS_ANSWER_FOREACH(rr, q->answer) {
- r = dns_question_matches_rr(q->question, rr, NULL);
- if (r < 0)
- return r;
- if (r > 0)
- return 0; /* It can answer it, yay! */
- }
+ r = dns_query_process_cname(q);
+ if (r != DNS_QUERY_NOMATCH)
+ return r;
/* OK, it cannot, let's begin with the new query */
r = dns_query_go(q);
if (r < 0)
return r;
- return 1; /* We return > 0, if we restarted the query for a new cname */
+ return DNS_QUERY_RESTARTED; /* We restarted the query for a new cname */
}
static int on_bus_track(sd_bus_track *t, void *userdata) {
@@ -1221,3 +1329,42 @@ int dns_query_bus_track(DnsQuery *q, sd_bus_message *m) {
return 0;
}
+
+DnsQuestion* dns_query_question_for_protocol(DnsQuery *q, DnsProtocol protocol) {
+ assert(q);
+
+ switch (protocol) {
+
+ case DNS_PROTOCOL_DNS:
+ return q->question_idna;
+
+ case DNS_PROTOCOL_MDNS:
+ case DNS_PROTOCOL_LLMNR:
+ return q->question_utf8;
+
+ default:
+ return NULL;
+ }
+}
+
+const char *dns_query_string(DnsQuery *q) {
+ const char *name;
+ int r;
+
+ /* Returns a somewhat useful human-readable lookup key string for this query */
+
+ if (q->request_address_string)
+ return q->request_address_string;
+
+ if (q->request_address_valid) {
+ r = in_addr_to_string(q->request_family, &q->request_address, &q->request_address_string);
+ if (r >= 0)
+ return q->request_address_string;
+ }
+
+ name = dns_question_first_name(q->question_utf8);
+ if (name)
+ return name;
+
+ return dns_question_first_name(q->question_idna);
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-04 11:53:18 +0000