X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fresolve%2Fresolved-dns-answer.c;h=7c4ab18b5835f97ce8210976340d4365e9441268;hb=0eb3cc88504b5d8f740764047ac5162b67992386;hp=34c854cb3a5cb8b8c473338268ec99eca55fc057;hpb=7e8e0422aeb16f2a09a40546c61df753d10029b6;p=elogind.git

diff --git a/src/resolve/resolved-dns-answer.c b/src/resolve/resolved-dns-answer.c
index 34c854cb3..7c4ab18b5 100644
--- a/src/resolve/resolved-dns-answer.c
+++ b/src/resolve/resolved-dns-answer.c
@@ -97,6 +97,32 @@ int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr) {
         return 1;
 }
 
+int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl) {
+        _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *soa = NULL;
+
+        soa = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_SOA, name);
+        if (!soa)
+                return -ENOMEM;
+
+        soa->ttl = ttl;
+
+        soa->soa.mname = strdup(name);
+        if (!soa->soa.mname)
+                return -ENOMEM;
+
+        soa->soa.rname = strappend("root.", name);
+        if (!soa->soa.rname)
+                return -ENOMEM;
+
+        soa->soa.serial = 1;
+        soa->soa.refresh = 1;
+        soa->soa.retry = 1;
+        soa->soa.expire = 1;
+        soa->soa.minimum = ttl;
+
+        return dns_answer_add(a, soa);
+}
+
 int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key) {
         unsigned i;
         int r;
@@ -122,6 +148,10 @@ int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **r
         assert(key);
         assert(ret);
 
+        /* For a SOA record we can never find a matching SOA record */
+        if (key->type == DNS_TYPE_SOA)
+                return 0;
+
         for (i = 0; i < a->n_rrs; i++) {
 
                 if (a->rrs[i]->key->class != DNS_CLASS_IN)
@@ -138,3 +168,71 @@ int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **r
 
         return 0;
 }
+
+DnsAnswer *dns_answer_merge(DnsAnswer *a, DnsAnswer *b) {
+        _cleanup_(dns_answer_unrefp) DnsAnswer *ret = NULL;
+        DnsAnswer *k;
+        unsigned i;
+        int r;
+
+        if (a && (!b || b->n_rrs <= 0))
+                return dns_answer_ref(a);
+        if ((!a || a->n_rrs <= 0) && b)
+                return dns_answer_ref(b);
+
+        ret = dns_answer_new((a ? a->n_rrs : 0) + (b ? b->n_rrs : 0));
+        if (!ret)
+                return NULL;
+
+        if (a) {
+                for (i = 0; i < a->n_rrs; i++) {
+                        r = dns_answer_add(ret, a->rrs[i]);
+                        if (r < 0)
+                                return NULL;
+                }
+        }
+
+        if (b) {
+                for (i = 0; i < b->n_rrs; i++) {
+                        r = dns_answer_add(ret, b->rrs[i]);
+                        if (r < 0)
+                                return NULL;
+                }
+        }
+
+        k = ret;
+        ret = NULL;
+
+        return k;
+}
+
+void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local) {
+        DnsResourceRecord **rrs;
+        unsigned i, start, end;
+        assert(a);
+
+        if (a->n_rrs <= 1)
+                return;
+
+        start = 0;
+        end = a->n_rrs-1;
+
+        /* RFC 4795, Section 2.6 suggests we should order entries
+         * depending on whether the sender is a link-local address. */
+
+        rrs = newa(DnsResourceRecord*, a->n_rrs);
+        for (i = 0; i < a->n_rrs; i++) {
+
+                if (a->rrs[i]->key->class == DNS_CLASS_IN &&
+                    ((a->rrs[i]->key->type == DNS_TYPE_A && in_addr_is_link_local(AF_INET, (union in_addr_union*) &a->rrs[i]->a.in_addr) != prefer_link_local) ||
+                     (a->rrs[i]->key->type == DNS_TYPE_AAAA && in_addr_is_link_local(AF_INET6, (union in_addr_union*) &a->rrs[i]->aaaa.in6_addr) != prefer_link_local)))
+                        /* Order address records that are are not preferred to the end of the array */
+                        rrs[end--] = a->rrs[i];
+                else
+                        /* Order all other records to the beginning of the array */
+                        rrs[start++] = a->rrs[i];
+        }
+
+        assert(start == end+1);
+        memcpy(a->rrs, rrs, sizeof(DnsResourceRecord*) * a->n_rrs);
+}