resolve: several follow-ups for ac6844460ca1c01eaf2cb209ffa21c200d21a8f8

- fix indentation,
- drop incorrect comment, dns_packet_ede_rcode() can handle unknown EDE rcode.
- 0 is a valid EDE rcode,
- DnsTransaction.answer_ede_msg may be NULL, so needs to use strempty()
  on logging,
- drop redundant ede_rcode temporary variable.

Follow-up for ac6844460ca1c01eaf2cb209ffa21c200d21a8f8.

1 files changed, 19 insertions, 21 deletions

diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index ea8243a2c8..aeae08f2f6 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -1223,38 +1223,35 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p, bool encrypt
         switch (t->scope->protocol) {
 
         case DNS_PROTOCOL_DNS: {
-                int ede_rcode;
-
                 assert(t->server);
 
-                if (dns_packet_ede_rcode(p, &ede_rcode, &t->answer_ede_msg) >= 0)
-                        t->answer_ede_rcode = ede_rcode;
+                (void) dns_packet_ede_rcode(p, &t->answer_ede_rcode, &t->answer_ede_msg);
 
                 if (!t->bypass &&
                     IN_SET(DNS_PACKET_RCODE(p), DNS_RCODE_FORMERR, DNS_RCODE_SERVFAIL, DNS_RCODE_NOTIMP)) {
                         /* If the server has replied with detailed error data, using a degraded feature set
                          * will likely not help anyone. Examine the detailed error to determine the best
                          * course of action. */
-                        if (ede_rcode >= 0 && DNS_PACKET_RCODE(p) == DNS_RCODE_SERVFAIL) {
+                        if (t->answer_ede_rcode >= 0 && DNS_PACKET_RCODE(p) == DNS_RCODE_SERVFAIL) {
                                 /* These codes are related to DNSSEC configuration errors. If accurate,
                                  * this is the domain operator's problem, and retrying won't help. */
-                                if (dns_ede_rcode_is_dnssec(ede_rcode)) {
+                                if (dns_ede_rcode_is_dnssec(t->answer_ede_rcode)) {
                                         log_debug("Server returned error: %s (%s%s%s). Lookup failed.",
-                                                        FORMAT_DNS_RCODE(DNS_PACKET_RCODE(p)),
-                                                        FORMAT_DNS_EDE_RCODE(ede_rcode),
-                                                        isempty(t->answer_ede_msg) ? "" : ": ",
-                                                        t->answer_ede_msg);
+                                                  FORMAT_DNS_RCODE(DNS_PACKET_RCODE(p)),
+                                                  FORMAT_DNS_EDE_RCODE(t->answer_ede_rcode),
+                                                  isempty(t->answer_ede_msg) ? "" : ": ",
+                                                  strempty(t->answer_ede_msg));
                                         dns_transaction_complete(t, DNS_TRANSACTION_UPSTREAM_DNSSEC_FAILURE);
                                         return;
                                 }
 
                                 /* These codes probably indicate a transient error. Let's try again. */
-                                if (IN_SET(ede_rcode, DNS_EDE_RCODE_NOT_READY, DNS_EDE_RCODE_NET_ERROR)) {
+                                if (IN_SET(t->answer_ede_rcode, DNS_EDE_RCODE_NOT_READY, DNS_EDE_RCODE_NET_ERROR)) {
                                         log_debug("Server returned error: %s (%s%s%s), retrying transaction.",
-                                                        FORMAT_DNS_RCODE(DNS_PACKET_RCODE(p)),
-                                                        FORMAT_DNS_EDE_RCODE(ede_rcode),
-                                                        isempty(t->answer_ede_msg) ? "" : ": ",
-                                                        t->answer_ede_msg);
+                                                  FORMAT_DNS_RCODE(DNS_PACKET_RCODE(p)),
+                                                  FORMAT_DNS_EDE_RCODE(t->answer_ede_rcode),
+                                                  isempty(t->answer_ede_msg) ? "" : ": ",
+                                                  strempty(t->answer_ede_msg));
                                         dns_transaction_retry(t, false);
                                         return;
                                 }
@@ -1262,11 +1259,12 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p, bool encrypt
                                 /* OK, the query failed, but we still shouldn't degrade the feature set for
                                  * this server. */
                                 log_debug("Server returned error: %s (%s%s%s)",
-                                                FORMAT_DNS_RCODE(DNS_PACKET_RCODE(p)),
-                                                FORMAT_DNS_EDE_RCODE(ede_rcode),
-                                                isempty(t->answer_ede_msg) ? "" : ": ", t->answer_ede_msg);
+                                          FORMAT_DNS_RCODE(DNS_PACKET_RCODE(p)),
+                                          FORMAT_DNS_EDE_RCODE(t->answer_ede_rcode),
+                                          isempty(t->answer_ede_msg) ? "" : ": ",
+                                          strempty(t->answer_ede_msg));
                                 break;
-                        } /* No EDE rcode, or EDE rcode we don't understand */
+                        }
 
                         /* Request failed, immediately try again with reduced features */
 
@@ -1323,9 +1321,9 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p, bool encrypt
 
                 if (DNS_PACKET_RCODE(p) == DNS_RCODE_REFUSED) {
                         /* This server refused our request? If so, try again, use a different server */
-                        if (ede_rcode > 0)
+                        if (t->answer_ede_rcode >= 0)
                                 log_debug("Server returned REFUSED (%s), switching servers, and retrying.",
-                                                FORMAT_DNS_EDE_RCODE(ede_rcode));
+                                          FORMAT_DNS_EDE_RCODE(t->answer_ede_rcode));
                         else
                                 log_debug("Server returned REFUSED, switching servers, and retrying.");