* 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_query qu, adns_queryflags xflags) {
- adns__diag(qu->ads,-1,qu,"cname following not implemented fixme");
- adns__query_fail(qu,adns_s_notimplemented);
-}
+#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, 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, ownermatched, l;
+ int rrtype, rrclass, rdlength, rdstart;
int anstart, nsstart, arstart;
+ int ownermatched, l, nrrs;
+ const typeinfo *typei;
adns_query qu, nqu;
dns_rcode rcode;
adns_status st;
vbuf tempvb;
+ byte *newquery, *rrsdata;
+ parseinfo pai;
if (dglen<DNS_HDRSIZE) {
adns__diag(ads,serv,0,"received datagram too short for message header (%d)",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= (f2&0x0f);
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,adns_qf_anyquote,
- dgram,dglen,DNS_HDRSIZE));
+ id, adns__diag_domain(ads,serv,0,&tempvb,dgram,dglen,DNS_HDRSIZE));
adns__vbuf_free(&tempvb);
}
return;
}
anstart= qu->query_dglen;
+ arstart= -1;
LIST_UNLINK(ads->timew,qu);
/* We're definitely going to do something with this query now */
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, &qu->vb,qu->flags,
- dgram,dglen,rrstart));
+ 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_dgram) { /* Ignore second and subsequent CNAMEs */
- qu->cname_dgram= adns__alloc_mine(qu,dglen);
- if (!qu->cname_dgram) return;
qu->cname_begin= rdstart;
qu->cname_dglen= dglen;
- st= adns__parse_domain(ads,serv,qu, &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 (!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) return;
+ 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
*/
} else {
adns__debug(ads,serv,qu,"ignoring duplicate CNAME (%s, as well as %s)",
- adns__diag_domain(ads,serv,qu, &qu->vb,qu->flags,
- dgram,dglen,rdstart),
+ adns__diag_domain(ads,serv,qu, &qu->vb, dgram,dglen,rdstart),
qu->answer->cname);
}
} else if (rrtype == (qu->typei->type & adns__rrt_typemask)) {
}
}
- /* 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) {
* 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 (cname_here) { cname_recurse(qu,0); return; }
+ if (cname_here) goto x_restartquery;
/* Bloody hell, I thought we asked for recursion ? */
if (flg_rd) {
/* Now, we have some RRs which we wanted. */
qu->answer->rrs.untyped= adns__alloc_interim(qu,qu->typei->rrsz*wantedrrs);
- if (!qu->answer->rrs.untyped) return;
+ 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++) {
+ rrsdata= qu->answer->rrs.bytes;
+
+ pai.ads= qu->ads;
+ pai.qu= qu;
+ pai.serv= serv;
+ pai.dgram= dgram;
+ pai.dglen= dglen;
+ pai.nsstart= nsstart;
+ pai.nscount= nscount;
+ pai.arcount= arcount;
+ pai.now= now;
+
+ for (rri=0, nrrs=0; rri<ancount; rri++) {
st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
&rrtype,&rrclass,&rdlength,&rdstart,
&ownermatched);
rrtype != (qu->typei->type & adns__rrt_typemask) ||
!ownermatched)
continue;
- assert(qu->answer->nrrs<wantedrrs);
- st= qu->typei->parse(qu,serv,
- dgram,dglen, rdstart,rdstart+rdlength,
- qu->answer->rrs.bytes+qu->answer->nrrs*qu->typei->rrsz);
+ 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;
- qu->answer->nrrs++;
+ nrrs++;
}
+ assert(nrrs==wantedrrs);
+ qu->answer->nrrs= nrrs;
/* This may have generated some child queries ... */
if (qu->children.head) {
return;
x_truncated:
+
if (!flg_tc) {
adns__diag(ads,serv,qu,"server sent datagram which points outside itself");
adns__query_fail(qu,adns_s_serverfaulty);
return;
}
- if (qu->cname_dgram) { cname_recurse(qu,adns_qf_usevc); return; }
- adns__reset_cnameonly(qu);
qu->flags |= adns_qf_usevc;
+
+ 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);
}
~ianmdlvl / adns.git / blobdiff