X-Git-Url: https://git.distorted.org.uk/~mdw/adns/blobdiff_plain/e576be5096ae358bebe2e9b6ad07c49f74aef616..828d89bd4196ad8ef825cdf2db26afe2eb797b69:/src/reply.c

diff --git a/src/reply.c b/src/reply.c
index 337d3f8..3b46e21 100644
--- a/src/reply.c
+++ b/src/reply.c
@@ -20,27 +20,31 @@
  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
  */
 
-#include "internal.h"
+#include <stdlib.h>
+#include <string.h>
 
-static void cname_recurse(adns_state ads, adns_query qu, adns_queryflags xflags) {
-  abort(); /* FIXME */
-}
+#include "internal.h"
     
 void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
 		     int serv, struct timeval now) {
-  int cbyte, rrstart, wantedrrs, rri, foundsoa, foundns;
-  int id, f1, f2, qdcount, ancount, nscount, arcount, flg_ra, flg_rd, flg_tc, opcode;
-  int rrtype, rrclass, rdlength, rdstart, ownermatched, ownerstart;
+  int cbyte, rrstart, wantedrrs, rri, foundsoa, foundns, cname_here;
+  int id, f1, f2, qdcount, ancount, nscount, arcount;
+  int flg_ra, flg_rd, flg_tc, flg_qr, opcode;
+  int rrtype, rrclass, rdlength, rdstart;
   int anstart, nsstart, arstart;
-  int currentrrs;
+  int ownermatched, l, nrrs, place;
+  const typeinfo *typei;
   adns_query qu, nqu;
   dns_rcode rcode;
   adns_status st;
+  vbuf tempvb;
+  byte *newquery, *rrsdata;
   
   if (dglen<DNS_HDRSIZE) {
-    adns__diag(ads,serv,"received datagram too short for message header (%d)",dglen);
+    adns__diag(ads,serv,0,"received datagram too short for message header (%d)",dglen);
     return;
   }
+  cbyte= 0;
   GET_W(cbyte,id);
   GET_B(cbyte,f1);
   GET_B(cbyte,f2);
@@ -52,41 +56,49 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
 
   flg_qr= f1&0x80;
   opcode= (f1&0x78)>>3;
-  flg_tc= f1&0x20;
+  flg_tc= f1&0x02;
   flg_rd= f1&0x01;
   flg_ra= f2&0x80;
-  rcode= (f1&0x0f);
+  rcode= (f2&0x0f);
 
-  if (flg_qr) {
-    adns__diag(ads,serv,"server sent us a query, not a response");
+  cname_here= 0;
+  
+  if (!flg_qr) {
+    adns__diag(ads,serv,0,"server sent us a query, not a response");
     return;
   }
   if (opcode) {
-    adns__diag(ads,serv,"server sent us unknown opcode %d (wanted 0=QUERY)",opcode);
+    adns__diag(ads,serv,0,"server sent us unknown opcode %d (wanted 0=QUERY)",opcode);
     return;
   }
   if (!qdcount) {
-    adns__diag(ads,serv,"server sent reply without quoting our question");
+    adns__diag(ads,serv,0,"server sent reply without quoting our question");
     return;
   } else if (qdcount>1) {
-    adns__diag(ads,serv,"server claimed to answer %d questions with one message",
+    adns__diag(ads,serv,0,"server claimed to answer %d questions with one message",
 	       qdcount);
     return;
   }
   for (qu= ads->timew.head; qu; qu= nqu) {
     nqu= qu->next;
     if (qu->id != id) continue;
-    if (dglen < qu->querylen) continue;
-    if (memcmp(qu->querymsg+DNS_HDRSIZE,dgram+DNS_HDRSIZE,qu->querylen-DNS_HDRSIZE))
+    if (dglen < qu->query_dglen) continue;
+    if (memcmp(qu->query_dgram+DNS_HDRSIZE,
+	       dgram+DNS_HDRSIZE,
+	       qu->query_dglen-DNS_HDRSIZE))
       continue;
     break;
   }
-  assert(qu->cnameoff == -1);
-  anstart= qu->querylen;
   if (!qu) {
-    adns__debug(ads,serv,"reply not found (id=%02x)",id);
+    if (ads->iflags & adns_if_debug) {
+      adns__vbuf_init(&tempvb);
+      adns__debug(ads,serv,0,"reply not found, id %02x, query owner %s",
+		  id, adns__diag_domain(ads,serv,0,&tempvb,dgram,dglen,DNS_HDRSIZE));
+      adns__vbuf_free(&tempvb);
+    }
     return;
   }
+  anstart= qu->query_dglen;
 
   LIST_UNLINK(ads->timew,qu);
   /* We're definitely going to do something with this query now */
@@ -97,22 +109,22 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
     break;
   case rcode_formaterror:
     adns__warn(ads,serv,qu,"server cannot understand our query (Format Error)");
-    adns__query_fail(ads,qu,adns_s_serverfaulty);
+    adns__query_fail(qu,adns_s_serverfaulty);
     return;
   case rcode_servfail:
-    adns__query_fail(ads,qu,adns_s_servfail);
+    adns__query_fail(qu,adns_s_servfail);
     return;
   case rcode_notimp:
     adns__warn(ads,serv,qu,"server claims not to implement our query");
-    adns__query_fail(ads,qu,adns_s_notimplemented);
+    adns__query_fail(qu,adns_s_notimplemented);
     return;
   case rcode_refused:
     adns__warn(ads,serv,qu,"server refused our query");
-    adns__query_fail(ads,qu,adns_s_refused);
+    adns__query_fail(qu,adns_s_refused);
     return;
   default:
     adns__warn(ads,serv,qu,"server gave unknown response code %d",rcode);
-    adns__query_fail(ads,qu,adns_s_reasonunknown);
+    adns__query_fail(qu,adns_s_reasonunknown);
     return;
   }
 
@@ -120,18 +132,13 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
    * If it has any CNAMEs we stuff them in the answer.
    */
   wantedrrs= 0;
+  cbyte= anstart;
   for (rri= 0; rri<ancount; rri++) {
     rrstart= cbyte;
-    if (qu->cname_dgram >= 0) {
-      st= adns__findrr(ads,serv, dgram,dglen,&cbyte,
-		       &rrtype,&rrclass,&rdlength,&rdstart,
-		       qu->cname_dgram,qu->cname_dglen,qu->cname_begin, &ownermatched);
-    } else {
-      st= adns__findrr(ads,serv, dgram,dglen,&cbyte,
-		       &rrtype,&rrclass,&rdlength,&rdstart,
-		       qu->querymsg,qu->querylen,DNS_HDRSIZE, &ownermatched);
-    }
-    if (st) adns__query_fail(ads,qu,st);
+    st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
+		     &rrtype,&rrclass,&rdlength,&rdstart,
+		     &ownermatched);
+    if (st) { adns__query_fail(qu,st); return; }
     if (rrtype == -1) goto x_truncated;
 
     if (rrclass != DNS_CLASS_IN) {
@@ -142,23 +149,29 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
     if (!ownermatched) {
       if (ads->iflags & adns_if_debug) {
 	adns__debug(ads,serv,qu,"ignoring RR with an unexpected owner %s",
-		    adns__diag_domain(ads,serv,&qu->vb,qu->flags,
-				      dgram,dglen,rrstart,dglen));
+		    adns__diag_domain(ads,serv,qu, &qu->vb, dgram,dglen,rrstart));
       }
       continue;
     }
-    if (rrtype == adns_r_cname &&
+    if (rrtype == adns_r_cname && /* fixme - implement adns_qf_nocname */
 	(qu->typei->type & adns__rrt_typemask) != adns_r_cname) {
-      if (!qu->cname_str) { /* Ignore second and subsequent CNAMEs */
+      if (!qu->cname_dgram) { /* Ignore second and subsequent CNAMEs */
 	qu->cname_begin= rdstart;
-	qu->cname_dgram= dgram;
 	qu->cname_dglen= dglen;
-	st= adns__parse_domain(ads,serv,&qu->vb,qu->flags,
+	st= adns__parse_domain(ads,serv,qu, &qu->vb,
+			       qu->flags & adns_qf_quoteok_cname ? pdf_quoteok : 0,
 			       dgram,dglen, &rdstart,rdstart+rdlength);
-	if (!vb.used) goto x_truncated;
-	if (st) { adns__query_fail(ads,qu,st); return; }
-	qu->answer->cname= adns__savestring(qu);
-	if (!qu->answer->cname) return;
+	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);
+	if (!qu->answer->cname) { adns__query_fail(qu,adns_s_nolocalmem); return; }
+
+	qu->cname_dgram= adns__alloc_mine(qu,dglen);
+	memcpy(qu->cname_dgram,dgram,dglen);
+
+	memcpy(qu->answer->cname,qu->vb.buf,l);
+	cname_here= 1;
 	/* 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
@@ -166,9 +179,8 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
 	 */
       } else {
 	adns__debug(ads,serv,qu,"ignoring duplicate CNAME (%s, as well as %s)",
-		    adns__diag_domain(ads,serv,&qu->vb,qu->flags,
-				      dgram,dglen, rdstart,rdstart+rdlength),
-		    qu->cname_str);
+		    adns__diag_domain(ads,serv,qu, &qu->vb, dgram,dglen,rdstart),
+		    qu->answer->cname);
       }
     } else if (rrtype == (qu->typei->type & adns__rrt_typemask)) {
       wantedrrs++;
@@ -177,14 +189,18 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
     }
   }
 
-  /* If we got here then the answer section is intact. */
+  /* We defer handling truncated responses here, in case there was a CNAME
+   * which we could use.
+   */
+  if (flg_tc) goto x_truncated;
+  
   nsstart= cbyte;
 
   if (!wantedrrs) {
     /* Oops, NODATA or NXDOMAIN or perhaps a referral (which would be a problem) */
     
     if (rcode == rcode_nxdomain) {
-      adns__query_finish(ads,qu,adns_s_nxdomain);
+      adns__query_fail(qu,adns_s_nxdomain);
       return;
     }
 
@@ -192,10 +208,9 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
     foundsoa= 0; foundns= 0;
     for (rri= 0; rri<nscount; rri++) {
       rrstart= cbyte;
-      st= adns__findrr(ads,serv, dgram,dglen,&cbyte,
-		       &rrtype,&rrclass,&rdlength,&rdstart,
-		       0,0,0,0);
-      if (st) { adns__query_fail(ads,qu,st); return; }
+      st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
+		       &rrtype,&rrclass,&rdlength,&rdstart, 0);
+      if (st) { adns__query_fail(qu,st); return; }
       if (rrtype==-1) goto x_truncated;
       if (rrclass != DNS_CLASS_IN) {
 	adns__diag(ads,serv,qu,
@@ -209,7 +224,7 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
 
     if (foundsoa || !foundns) {
       /* Aha !  A NODATA response, good. */
-      adns__query_finish(ads,qu,adns_s_nodata);
+      adns__query_fail(qu,adns_s_nodata);
       return;
     }
 
@@ -218,7 +233,7 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
      * a CNAME in this datagram then we should probably do our own CNAME
      * lookup now in the hope that we won't get a referral again.
      */
-    if (qu->cname_dgram == dgram) { cname_recurse(ads,qu,0); return; }
+    if (cname_here) goto x_restartquery;
 
     /* Bloody hell, I thought we asked for recursion ? */
     if (flg_rd) {
@@ -226,43 +241,63 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
     }
     if (!flg_ra) {
       adns__diag(ads,serv,qu,"server is not willing to do recursive lookups for us");
-      adns__query_fail(ads,qu,adns_s_norecurse);
+      adns__query_fail(qu,adns_s_norecurse);
     } else {
       adns__diag(ads,serv,qu,"server claims to do recursion, but gave us a referral");
-      adns__query_fail(ads,qu,adns_s_serverfaulty);
+      adns__query_fail(qu,adns_s_serverfaulty);
     }
     return;
   }
 
   /* Now, we have some RRs which we wanted. */
 
-  qu->ans->rrs= adns__alloc_interim(qu,qu->typei->rrsz*wantedrrs);
-  if (!qu->ans->rrs) return;
+  qu->answer->rrs.untyped= adns__alloc_interim(qu,qu->typei->rrsz*wantedrrs);
+  if (!qu->answer->rrs.untyped) { adns__query_fail(qu,adns_s_nolocalmem); return; }
 
+  typei= qu->typei;
   cbyte= anstart;
   arstart= -1;
-  for (rri=0; rri<ancount; rri++) {
-    if (qu->cname_dgram >= 0) {
-      st= adns__findrr(ads,serv, dgram,dglen,&cbyte,
-		       &rrtype,&rrclass,&rdlength,&rdstart,
-		       qu->cname_dgram,qu->cname_dglen,qu->cname_begin, &ownermatched);
-    } else {
-      st= adns__findrr(ads,serv, dgram,dglen,&cbyte,
-		       &rrtype,&rrclass,&rdlength,&rdstart,
-		       qu->querymsg,qu->querylen,DNS_HDRSIZE, &ownermatched);
+  rrsdata= qu->answer->rrs.bytes;
+  
+  if (typei->diff_needswap) {
+    if (!adns__vbuf_ensure(&qu->vb,typei->rrsz)) {
+      adns__query_fail(qu,adns_s_nolocalmem);
+      return;
     }
+  }
+  nrrs= 0;
+  
+  for (rri=0; rri<ancount; rri++) {
+    st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
+		     &rrtype,&rrclass,&rdlength,&rdstart,
+		     &ownermatched);
     assert(!st); assert(rrtype != -1);
     if (rrclass != DNS_CLASS_IN ||
 	rrtype != (qu->typei->type & adns__rrt_typemask) ||
 	!ownermatched)
       continue;
-    assert(qu->ans->nrrs<wantedrrs);
-    st= qu->typei->parse(ads,qu,serv,
-			 dgram,dglen, &rdstart,rdstart+rdlength,
-			 qu->ans->rrs.bytes+qu->ans->nrrs*quj->typei->rrsz);
-    if (st) { adns__query_fail(ads,qu,st); return; }
+    st= typei->parse(qu,serv, dgram,dglen, rdstart,rdstart+rdlength,
+		     rrsdata+nrrs*typei->rrsz);
+    if (st) { adns__query_fail(qu,st); return; }
     if (rdstart==-1) goto x_truncated;
+
+    if (typei->diff_needswap) {
+      for (place= nrrs;
+	   place>0 && typei->diff_needswap(rrsdata+(place-1)*typei->rrsz,
+					   rrsdata+nrrs*typei->rrsz);
+	   place--);
+      if (place != nrrs) {
+	memcpy(qu->vb.buf,rrsdata+nrrs*typei->rrsz,typei->rrsz);
+	memmove(rrsdata+(place+1)*typei->rrsz,
+		rrsdata+place*typei->rrsz,
+		(nrrs-place)*typei->rrsz);
+	memcpy(rrsdata+place*typei->rrsz,qu->vb.buf,typei->rrsz);
+      }
+    }
+    nrrs++;
   }
+  assert(nrrs==wantedrrs);
+  qu->answer->nrrs= nrrs;
 
   /* This may have generated some child queries ... */
   if (qu->children.head) {
@@ -271,17 +306,34 @@ void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
     return;
   }
 
-  adns__query_finish(ads,qu,adns_s_ok);
+  adns__query_done(qu);
   return;
 
  x_truncated:
+  
   if (!flg_tc) {
     adns__diag(ads,serv,qu,"server sent datagram which points outside itself");
-    adns__query_fail(ads,qu,adns_s_serverfaulty);
+    adns__query_fail(qu,adns_s_serverfaulty);
     return;
   }
-  if (qu->cname_dgram) { cname_recurse(ads,qu,adns_qf_usevc); return; }
-  adns__reset_cnameonly(ads,qu);
   qu->flags |= adns_qf_usevc;
-  adns__query_udp(ads,qu,now);
+  
+ x_restartquery:
+  
+  if (qu->cname_dgram) {
+    st= adns__mkquery_frdgram(qu->ads,&qu->vb,&qu->id,
+			      qu->cname_dgram, qu->cname_dglen, qu->cname_begin,
+			      qu->typei->type, qu->flags);
+    if (st) { adns__query_fail(qu,st); return; }
+    
+    newquery= realloc(qu->query_dgram,qu->vb.used);
+    if (!newquery) { adns__query_fail(qu,adns_s_nolocalmem); return; }
+    
+    qu->query_dgram= newquery;
+    qu->query_dglen= qu->vb.used;
+    memcpy(newquery,qu->vb.buf,qu->vb.used);
+  }
+  
+  adns__reset_cnameonly(qu);
+  adns__query_udp(qu,now);
 }