From f471bc11c694bcc486d0b6b14a486fb74609c0c1 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 20 Jun 2016 21:39:02 +0200
Subject: resolved: add dns_packet_add_{question,answer}() helper

And make use of it at a couple of places.
---
 src/resolve/resolved-dns-packet.c | 31 +++++++++++++++++++++++++++++
 src/resolve/resolved-dns-packet.h |  2 ++
 src/resolve/resolved-dns-scope.c  | 42 +++++++++++++--------------------------
 3 files changed, 47 insertions(+), 28 deletions(-)

(limited to 'src')

diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index b7907bb511..32978eb924 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -791,6 +791,7 @@ int dns_packet_truncate_opt(DnsPacket *p) {
 }
 
 int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *start, size_t *rdata_start) {
+
         size_t saved_size, rdlength_offset, end, rdlength, rds;
         int r;
 
@@ -1134,6 +1135,36 @@ fail:
         return r;
 }
 
+int dns_packet_append_question(DnsPacket *p, DnsQuestion *q) {
+        DnsResourceKey *key;
+        int r;
+
+        assert(p);
+
+        DNS_QUESTION_FOREACH(key, q) {
+                r = dns_packet_append_key(p, key, NULL);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
+int dns_packet_append_answer(DnsPacket *p, DnsAnswer *a) {
+        DnsResourceRecord *rr;
+        int r;
+
+        assert(p);
+
+        DNS_ANSWER_FOREACH(rr, a) {
+                r = dns_packet_append_rr(p, rr, NULL, NULL);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
 int dns_packet_read(DnsPacket *p, size_t sz, const void **ret, size_t *start) {
         assert(p);
 
diff --git a/src/resolve/resolved-dns-packet.h b/src/resolve/resolved-dns-packet.h
index 416335d0a2..fe2b386297 100644
--- a/src/resolve/resolved-dns-packet.h
+++ b/src/resolve/resolved-dns-packet.h
@@ -183,6 +183,8 @@ int dns_packet_append_name(DnsPacket *p, const char *name, bool allow_compressio
 int dns_packet_append_key(DnsPacket *p, const DnsResourceKey *key, size_t *start);
 int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *start, size_t *rdata_start);
 int dns_packet_append_opt(DnsPacket *p, uint16_t max_udp_size, bool edns0_do, size_t *start);
+int dns_packet_append_question(DnsPacket *p, DnsQuestion *q);
+int dns_packet_append_answer(DnsPacket *p, DnsAnswer *a);
 
 void dns_packet_truncate(DnsPacket *p, size_t sz);
 int dns_packet_truncate_opt(DnsPacket *p);
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
index 6f56148732..275189aeb7 100644
--- a/src/resolve/resolved-dns-scope.c
+++ b/src/resolve/resolved-dns-scope.c
@@ -578,6 +578,7 @@ static int dns_scope_multicast_membership(DnsScope *s, bool b, struct in_addr in
 }
 
 int dns_scope_llmnr_membership(DnsScope *s, bool b) {
+        assert(s);
 
         if (s->protocol != DNS_PROTOCOL_LLMNR)
                 return 0;
@@ -586,6 +587,7 @@ int dns_scope_llmnr_membership(DnsScope *s, bool b) {
 }
 
 int dns_scope_mdns_membership(DnsScope *s, bool b) {
+        assert(s);
 
         if (s->protocol != DNS_PROTOCOL_MDNS)
                 return 0;
@@ -604,7 +606,6 @@ static int dns_scope_make_reply_packet(
                 DnsPacket **ret) {
 
         _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
-        unsigned i;
         int r;
 
         assert(s);
@@ -631,35 +632,20 @@ static int dns_scope_make_reply_packet(
                                                               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->items[i].rr, NULL, NULL);
-                        if (r < 0)
-                                return r;
-                }
-
-                DNS_PACKET_HEADER(p)->ancount = htobe16(answer->n_rrs);
-        }
+        r = dns_packet_append_question(p, q);
+        if (r < 0)
+                return r;
+        DNS_PACKET_HEADER(p)->qdcount = htobe16(dns_question_size(q));
 
-        if (soa) {
-                for (i = 0; i < soa->n_rrs; i++) {
-                        r = dns_packet_append_rr(p, soa->items[i].rr, NULL, NULL);
-                        if (r < 0)
-                                return r;
-                }
+        r = dns_packet_append_answer(p, answer);
+        if (r < 0)
+                return r;
+        DNS_PACKET_HEADER(p)->ancount = htobe16(dns_answer_size(answer));
 
-                DNS_PACKET_HEADER(p)->arcount = htobe16(soa->n_rrs);
-        }
+        r = dns_packet_append_answer(p, soa);
+        if (r < 0)
+                return r;
+        DNS_PACKET_HEADER(p)->arcount = htobe16(dns_answer_size(soa));
 
         *ret = p;
         p = NULL;
-- 
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