resolved: don't claim DnsQuestion have to have the same names

Wen DnsQuestion objects are used for DnsQuery objects all contained keys
have to share the same name, but otherwise they generally don't have to,
and this can actually happen in real-life because DnsPacket objects for
mDNS use DnsQuestion for the question section.

Hence, rename:

dns_question_is_valid() to dns_question_is_valid_for_query(), since the
name uniqueness check it does is only relevant when used for a query.

Similar, rename dns_question_name() to dns_question_first_name(),
to be more accurate, as this difference matters if we keys don#t have to
share the same name.

4 files changed, 21 insertions, 19 deletions

diff --git a/src/resolve/resolved-bus.c b/src/resolve/resolved-bus.c
index a43aa59cc0..0b6f586d3d 100644
--- a/src/resolve/resolved-bus.c
+++ b/src/resolve/resolved-bus.c
@@ -38,7 +38,7 @@ static int reply_query_state(DnsQuery *q) {
 
                 name = ip;
         } else
-                name = dns_question_name(q->question);
+                name = dns_question_first_name(q->question);
 
         switch (q->state) {
 
@@ -145,7 +145,7 @@ static void bus_method_resolve_hostname_complete(DnsQuery *q) {
 
         r = dns_query_process_cname(q);
         if (r == -ELOOP) {
-                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_name(q->question));
+                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(q->question));
                 goto finish;
         }
         if (r < 0)
@@ -184,7 +184,7 @@ static void bus_method_resolve_hostname_complete(DnsQuery *q) {
         }
 
         if (added <= 0) {
-                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_question_name(q->question));
+                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_question_first_name(q->question));
                 goto finish;
         }
 
@@ -466,7 +466,7 @@ static void bus_method_resolve_record_complete(DnsQuery *q) {
 
         r = dns_query_process_cname(q);
         if (r == -ELOOP) {
-                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_name(q->question));
+                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(q->question));
                 goto finish;
         }
         if (r < 0)
@@ -502,7 +502,7 @@ static void bus_method_resolve_record_complete(DnsQuery *q) {
         }
 
         if (added <= 0) {
-                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Name '%s' does not have any RR of the requested type", dns_question_name(q->question));
+                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Name '%s' does not have any RR of the requested type", dns_question_first_name(q->question));
                 goto finish;
         }
 
@@ -612,7 +612,7 @@ static int append_srv(DnsQuery *q, sd_bus_message *reply, DnsResourceRecord *rr)
                         if (aux->auxiliary_result != 0)
                                 continue;
 
-                        r = dns_name_equal(dns_question_name(aux->question), rr->srv.name);
+                        r = dns_name_equal(dns_question_first_name(aux->question), rr->srv.name);
                         if (r < 0)
                                 return r;
                         if (r == 0)
@@ -664,7 +664,7 @@ static int append_srv(DnsQuery *q, sd_bus_message *reply, DnsResourceRecord *rr)
                         if (aux->auxiliary_result != 0)
                                 continue;
 
-                        r = dns_name_equal(dns_question_name(aux->question), rr->srv.name);
+                        r = dns_name_equal(dns_question_first_name(aux->question), rr->srv.name);
                         if (r < 0)
                                 return r;
                         if (r == 0)
@@ -773,7 +773,7 @@ static void resolve_service_all_complete(DnsQuery *q) {
                                 assert(bad->auxiliary_result != 0);
 
                                 if (bad->auxiliary_result == -ELOOP) {
-                                        r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_name(bad->question));
+                                        r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(bad->question));
                                         goto finish;
                                 }
 
@@ -818,7 +818,7 @@ static void resolve_service_all_complete(DnsQuery *q) {
         }
 
         if (added <= 0) {
-                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_question_name(q->question));
+                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_question_first_name(q->question));
                 goto finish;
         }
 
@@ -957,7 +957,7 @@ static void bus_method_resolve_service_complete(DnsQuery *q) {
 
         r = dns_query_process_cname(q);
         if (r == -ELOOP) {
-                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_name(q->question));
+                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(q->question));
                 goto finish;
         }
         if (r < 0)
@@ -993,7 +993,7 @@ static void bus_method_resolve_service_complete(DnsQuery *q) {
         }
 
         if (found <= 0) {
-                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_question_name(q->question));
+                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_question_first_name(q->question));
                 goto finish;
         }
 
diff --git a/src/resolve/resolved-dns-query.c b/src/resolve/resolved-dns-query.c
index c1cd650651..0970f3ead7 100644
--- a/src/resolve/resolved-dns-query.c
+++ b/src/resolve/resolved-dns-query.c
@@ -85,7 +85,7 @@ int dns_query_new(Manager *m, DnsQuery **ret, DnsQuestion *question, int ifindex
         assert(m);
         assert(question);
 
-        r = dns_question_is_valid(question);
+        r = dns_question_is_valid_for_query(question);
         if (r < 0)
                 return r;
 
@@ -655,7 +655,7 @@ int dns_query_go(DnsQuery *q) {
         assert(q->question);
         assert(q->question->n_keys > 0);
 
-        name = dns_question_name(q->question);
+        name = dns_question_first_name(q->question);
 
         LIST_FOREACH(scopes, s, q->manager->dns_scopes) {
                 DnsScopeMatch match;
diff --git a/src/resolve/resolved-dns-question.c b/src/resolve/resolved-dns-question.c
index 9fb3038381..b1aa0175e0 100644
--- a/src/resolve/resolved-dns-question.c
+++ b/src/resolve/resolved-dns-question.c
@@ -125,7 +125,7 @@ int dns_question_matches_cname(DnsQuestion *q, DnsResourceRecord *rr) {
         return 0;
 }
 
-int dns_question_is_valid(DnsQuestion *q) {
+int dns_question_is_valid_for_query(DnsQuestion *q) {
         const char *name;
         unsigned i;
         int r;
@@ -274,8 +274,10 @@ int dns_question_cname_redirect(DnsQuestion *q, const DnsResourceRecord *cname,
         return 1;
 }
 
-const char *dns_question_name(DnsQuestion *q) {
-        assert(q);
+const char *dns_question_first_name(DnsQuestion *q) {
+
+        if (!q)
+                return NULL;
 
         if (q->n_keys < 1)
                 return NULL;
diff --git a/src/resolve/resolved-dns-question.h b/src/resolve/resolved-dns-question.h
index 9894ef6ec5..d728b9bed2 100644
--- a/src/resolve/resolved-dns-question.h
+++ b/src/resolve/resolved-dns-question.h
@@ -25,7 +25,7 @@ typedef struct DnsQuestion DnsQuestion;
 
 #include "resolved-dns-rr.h"
 
-/* A simple array of resources keys, all sharing the same domain */
+/* A simple array of resources keys */
 
 struct DnsQuestion {
         unsigned n_ref;
@@ -45,12 +45,12 @@ int dns_question_add(DnsQuestion *q, DnsResourceKey *key);
 
 int dns_question_matches_rr(DnsQuestion *q, DnsResourceRecord *rr);
 int dns_question_matches_cname(DnsQuestion *q, DnsResourceRecord *rr);
-int dns_question_is_valid(DnsQuestion *q);
+int dns_question_is_valid_for_query(DnsQuestion *q);
 int dns_question_contains(DnsQuestion *a, DnsResourceKey *k);
 int dns_question_is_equal(DnsQuestion *a, DnsQuestion *b);
 
 int dns_question_cname_redirect(DnsQuestion *q, const DnsResourceRecord *cname, DnsQuestion **ret);
 
-const char *dns_question_name(DnsQuestion *q);
+const char *dns_question_first_name(DnsQuestion *q);
 
 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuestion*, dns_question_unref);