X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/adns/blobdiff_plain/9b86645c0f741697d64ccbab983bf2433a6fa06e..1be24aefb650dc38c9121dc7a3e1de2fceb900fa:/src/reply.c?ds=inline

diff --git a/src/reply.c b/src/reply.c
index 6198d07..0ee134a 100644
--- a/src/reply.c
+++ b/src/reply.c
@@ -3,7 +3,7 @@
  * - main handling and parsing routine for received datagrams
  */
 /*
- *  This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson
+ *  This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
  *  
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -33,6 +33,7 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
   int rrtype, rrclass, rdlength, rdstart;
   int anstart, nsstart, arstart;
   int ownermatched, l, nrrs;
+  unsigned long ttl, soattl;
   const typeinfo *typei;
   adns_query qu, nqu;
   dns_rcode rcode;
@@ -138,7 +139,7 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
   for (rri= 0; rri<ancount; rri++) {
     rrstart= cbyte;
     st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
-		     &rrtype,&rrclass,&rdlength,&rdstart,
+		     &rrtype,&rrclass,&ttl, &rdlength,&rdstart,
 		     &ownermatched);
     if (st) { adns__query_fail(qu,st); return; }
     if (rrtype == -1) goto x_truncated;
@@ -155,9 +156,12 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
       }
       continue;
     }
-    if (rrtype == adns_r_cname && /* fixme - implement adns_qf_nocname */
+    if (rrtype == adns_r_cname &&
 	(qu->typei->type & adns__rrt_typemask) != adns_r_cname) {
-      if (!qu->cname_dgram) { /* Ignore second and subsequent CNAMEs */
+      if (qu->flags & adns_qf_cname_forbid) {
+	adns__query_fail(qu,adns_s_prohibitedcname);
+	return;
+      } else if (!qu->cname_dgram) { /* Ignore second and subsequent CNAMEs */
 	qu->cname_begin= rdstart;
 	qu->cname_dglen= dglen;
 	st= adns__parse_domain(ads,serv,qu, &qu->vb,
@@ -166,7 +170,7 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
 	if (!qu->vb.used) goto x_truncated;
 	if (st) { adns__query_fail(qu,st); return; }
 	l= strlen(qu->vb.buf)+1;
-	qu->answer->cname= adns__alloc_interim(qu,l);
+	qu->answer->cname= adns__alloc_preserved(qu,l);
 	if (!qu->answer->cname) { adns__query_fail(qu,adns_s_nomemory); return; }
 
 	qu->cname_dgram= adns__alloc_mine(qu,dglen);
@@ -174,6 +178,7 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
 
 	memcpy(qu->answer->cname,qu->vb.buf,l);
 	cname_here= 1;
+	adns__update_expires(qu,ttl,now);
 	/* If we find the answer section truncated after this point we restart
 	 * the query at the CNAME; if beforehand then we obviously have to use
 	 * TCP.  If there is no truncation we can use the whole answer if
@@ -200,18 +205,13 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
 
   if (!wantedrrs) {
     /* Oops, NODATA or NXDOMAIN or perhaps a referral (which would be a problem) */
-    
-    if (rcode == rcode_nxdomain) {
-      adns__query_fail(qu,adns_s_nxdomain);
-      return;
-    }
 
     /* RFC2308: NODATA has _either_ a SOA _or_ _no_ NS records in authority section */
-    foundsoa= 0; foundns= 0;
+    foundsoa= 0; soattl= 0; foundns= 0;
     for (rri= 0; rri<nscount; rri++) {
       rrstart= cbyte;
       st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
-		       &rrtype,&rrclass,&rdlength,&rdstart, 0);
+		       &rrtype,&rrclass,&ttl, &rdlength,&rdstart, 0);
       if (st) { adns__query_fail(qu,st); return; }
       if (rrtype==-1) goto x_truncated;
       if (rrclass != DNS_CLASS_IN) {
@@ -220,12 +220,25 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
 		   rrclass,DNS_CLASS_IN);
 	continue;
       }
-      if (rrtype == adns_r_soa_raw) { foundsoa= 1; break; }
+      if (rrtype == adns_r_soa_raw) { foundsoa= 1; soattl= ttl; break; }
       else if (rrtype == adns_r_ns_raw) { foundns= 1; }
     }
+    
+    if (rcode == rcode_nxdomain) {
+      /* We still wanted to look for the SOA so we could find the TTL. */
+      adns__update_expires(qu,soattl,now);
+
+      if (qu->flags & adns_qf_search) {
+	adns__search_next(ads,qu,now);
+      } else {
+	adns__query_fail(qu,adns_s_nxdomain);
+      }
+      return;
+    }
 
     if (foundsoa || !foundns) {
       /* Aha !  A NODATA response, good. */
+      adns__update_expires(qu,soattl,now);
       adns__query_fail(qu,adns_s_nodata);
       return;
     }
@@ -272,13 +285,14 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
 
   for (rri=0, nrrs=0; rri<ancount; rri++) {
     st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
-		     &rrtype,&rrclass,&rdlength,&rdstart,
+		     &rrtype,&rrclass,&ttl, &rdlength,&rdstart,
 		     &ownermatched);
     assert(!st); assert(rrtype != -1);
     if (rrclass != DNS_CLASS_IN ||
 	rrtype != (qu->typei->type & adns__rrt_typemask) ||
 	!ownermatched)
       continue;
+    adns__update_expires(qu,ttl,now);
     st= typei->parse(&pai, rdstart,rdstart+rdlength, rrsdata+nrrs*typei->rrsz);
     if (st) { adns__query_fail(qu,st); return; }
     if (rdstart==-1) goto x_truncated;
@@ -322,6 +336,6 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
     memcpy(newquery,qu->vb.buf,qu->vb.used);
   }
   
-  adns__reset_cnameonly(qu);
+  adns__reset_preserved(qu);
   adns__query_udp(qu,now);
 }