[adns] / src / reply.c

/*
 * reply.c
 * - main handling and parsing routine for received datagrams
 */
/*
 *  This file is part of adns, which is Copyright (C) 1997, 1998 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
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *  
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software Foundation,
 *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
 */

#include "internal.h"

static void cname_recurse(adns_query qu, adns_queryflags xflags) {
  abort(); /* FIXME */
}
    
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;
  int flg_ra, flg_rd, flg_tc, flg_qr, opcode;
  int rrtype, rrclass, rdlength, rdstart, ownermatched, l;
  int anstart, nsstart, arstart;
  adns_query qu, nqu;
  dns_rcode rcode;
  adns_status st;
  
  if (dglen<DNS_HDRSIZE) {
    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);
  GET_W(cbyte,qdcount);
  GET_W(cbyte,ancount);
  GET_W(cbyte,nscount);
  GET_W(cbyte,arcount);
  assert(cbyte == DNS_HDRSIZE);

  flg_qr= f1&0x80;
  opcode= (f1&0x78)>>3;
  flg_tc= f1&0x20;
  flg_rd= f1&0x01;
  flg_ra= f2&0x80;
  rcode= (f1&0x0f);

  if (!flg_qr) {
    adns__diag(ads,serv,0,"server sent us a query, not a response");
    return;
  }
  if (opcode) {
    adns__diag(ads,serv,0,"server sent us unknown opcode %d (wanted 0=QUERY)",opcode);
    return;
  }
  if (!qdcount) {
    adns__diag(ads,serv,0,"server sent reply without quoting our question");
    return;
  } else if (qdcount>1) {
    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->query_dglen) continue;
    if (memcmp(qu->query_dgram+DNS_HDRSIZE,
	       dgram+DNS_HDRSIZE,
	       qu->query_dglen-DNS_HDRSIZE))
      continue;
    break;
  }
  anstart= qu->query_dglen;
  if (!qu) {
    adns__debug(ads,serv,0,"reply not found (id=%02x)",id);
    return;
  }

  LIST_UNLINK(ads->timew,qu);
  /* We're definitely going to do something with this query now */
  
  switch (rcode) {
  case rcode_noerror:
  case rcode_nxdomain:
    break;
  case rcode_formaterror:
    adns__warn(ads,serv,qu,"server cannot understand our query (Format Error)");
    adns__query_fail(qu,adns_s_serverfaulty);
    return;
  case rcode_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(qu,adns_s_notimplemented);
    return;
  case rcode_refused:
    adns__warn(ads,serv,qu,"server refused our query");
    adns__query_fail(qu,adns_s_refused);
    return;
  default:
    adns__warn(ads,serv,qu,"server gave unknown response code %d",rcode);
    adns__query_fail(qu,adns_s_reasonunknown);
    return;
  }

  /* Now, take a look at the answer section, and see if it is complete.
   * If it has any CNAMEs we stuff them in the answer.
   */
  wantedrrs= 0;
  for (rri= 0; rri<ancount; rri++) {
    rrstart= cbyte;
    st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
		     &rrtype,&rrclass,&rdlength,&rdstart,
		     &ownermatched);
    if (st) adns__query_fail(qu,st);
    if (rrtype == -1) goto x_truncated;

    if (rrclass != DNS_CLASS_IN) {
      adns__diag(ads,serv,qu,"ignoring answer RR with wrong class %d (expected IN=%d)",
		 rrclass,DNS_CLASS_IN);
      continue;
    }
    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));
      }
      continue;
    }
    if (rrtype == adns_r_cname &&
	(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,
			       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;
	memcpy(qu->answer->cname,qu->vb.buf,l);
	/* 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
	 * it contains the relevant info.
	 */
      } 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),
		    qu->answer->cname);
      }
    } else if (rrtype == (qu->typei->type & adns__rrt_typemask)) {
      wantedrrs++;
    } else {
      adns__debug(ads,serv,qu,"ignoring answer RR with irrelevant type %d",rrtype);
    }
  }

  /* If we got here then the answer section is intact. */
  nsstart= cbyte;

  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;
    for (rri= 0; rri<nscount; rri++) {
      rrstart= cbyte;
      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,
		   "ignoring authority RR with wrong class %d (expected IN=%d)",
		   rrclass,DNS_CLASS_IN);
	continue;
      }
      if (rrtype == adns_r_soa_raw) { foundsoa= 1; break; }
      else if (rrtype == adns_r_ns_raw) { foundns= 1; }
    }

    if (foundsoa || !foundns) {
      /* Aha !  A NODATA response, good. */
      adns__query_fail(qu,adns_s_nodata);
      return;
    }

    /* Now what ?  No relevant answers, no SOA, and at least some NS's.
     * Looks like a referral.  Just one last chance ... if we came across
     * 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(qu,0); return; }

    /* Bloody hell, I thought we asked for recursion ? */
    if (flg_rd) {
      adns__diag(ads,serv,qu,"server thinks we didn't ask for recursive lookup");
    }
    if (!flg_ra) {
      adns__diag(ads,serv,qu,"server is not willing to do recursive lookups for us");
      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(qu,adns_s_serverfaulty);
    }
    return;
  }

  /* 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;

  cbyte= anstart;
  arstart= -1;
  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->answer->nrrs<wantedrrs);
    st= qu->typei->parse(qu,serv,
			 dgram,dglen, rdstart,rdstart+rdlength,
			 qu->answer->rrs.bytes+qu->answer->nrrs*qu->typei->rrsz);
    if (st) { adns__query_fail(qu,st); return; }
    if (rdstart==-1) goto x_truncated;
  }

  /* This may have generated some child queries ... */
  if (qu->children.head) {
    qu->state= query_child;
    LIST_LINK_TAIL(ads->childw,qu);
    return;
  }

  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(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;
  adns__query_udp(qu,now);
}
Commit	Line	Data
98db6da3	1	/*
	2	* reply.c
	3	* - main handling and parsing routine for received datagrams
	4	*/
	5	/*
	6	* This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2, or (at your option)
	11	* any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software Foundation,
	20	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	21	*/
d05cc330	22
	23	#include "internal.h"
	24
11c8bf9b	25	static void cname_recurse(adns_query qu, adns_queryflags xflags) {
5c596e4d	26	abort(); /* FIXME */
54ed1d64	27	}
54ed1d64	28
5c596e4d	29	void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
	30	int serv, struct timeval now) {
	31	int cbyte, rrstart, wantedrrs, rri, foundsoa, foundns;
11c8bf9b	32	int id, f1, f2, qdcount, ancount, nscount, arcount;
	33	int flg_ra, flg_rd, flg_tc, flg_qr, opcode;
	34	int rrtype, rrclass, rdlength, rdstart, ownermatched, l;
5c596e4d	35	int anstart, nsstart, arstart;
5c596e4d	36	adns_query qu, nqu;
5c596e4d	37	dns_rcode rcode;
54ed1d64	38	adns_status st;
168e26fe	39
5c596e4d	40	if (dglen<DNS_HDRSIZE) {
11c8bf9b	41	adns__diag(ads,serv,0,"received datagram too short for message header (%d)",dglen);
168e26fe	42	return;
168e26fe	43	}
9a2b67d4	44	cbyte= 0;
54ed1d64	45	GET_W(cbyte,id);
	46	GET_B(cbyte,f1);
	47	GET_B(cbyte,f2);
	48	GET_W(cbyte,qdcount);
	49	GET_W(cbyte,ancount);
	50	GET_W(cbyte,nscount);
	51	GET_W(cbyte,arcount);
5c596e4d	52	assert(cbyte == DNS_HDRSIZE);
168e26fe	53
7f702335	54	flg_qr= f1&0x80;
7f702335	55	opcode= (f1&0x78)>>3;
5c596e4d	56	flg_tc= f1&0x20;
7f702335	57	flg_rd= f1&0x01;
8312a1c2	58	flg_ra= f2&0x80;
7f702335	59	rcode= (f1&0x0f);
8312a1c2	60
9a2b67d4	61	if (!flg_qr) {
11c8bf9b	62	adns__diag(ads,serv,0,"server sent us a query, not a response");
168e26fe	63	return;
168e26fe	64	}
7f702335	65	if (opcode) {
11c8bf9b	66	adns__diag(ads,serv,0,"server sent us unknown opcode %d (wanted 0=QUERY)",opcode);
168e26fe	67	return;
	68	}
	69	if (!qdcount) {
11c8bf9b	70	adns__diag(ads,serv,0,"server sent reply without quoting our question");
168e26fe	71	return;
168e26fe	72	} else if (qdcount>1) {
11c8bf9b	73	adns__diag(ads,serv,0,"server claimed to answer %d questions with one message",
168e26fe	74	qdcount);
	75	return;
	76	}
5c596e4d	77	for (qu= ads->timew.head; qu; qu= nqu) {
168e26fe	78	nqu= qu->next;
168e26fe	79	if (qu->id != id) continue;
11c8bf9b	80	if (dglen < qu->query_dglen) continue;
	81	if (memcmp(qu->query_dgram+DNS_HDRSIZE,
	82	dgram+DNS_HDRSIZE,
	83	qu->query_dglen-DNS_HDRSIZE))
54ed1d64	84	continue;
168e26fe	85	break;
168e26fe	86	}
11c8bf9b	87	anstart= qu->query_dglen;
168e26fe	88	if (!qu) {
11c8bf9b	89	adns__debug(ads,serv,0,"reply not found (id=%02x)",id);
168e26fe	90	return;
168e26fe	91	}
5c596e4d	92
	93	LIST_UNLINK(ads->timew,qu);
	94	/* We're definitely going to do something with this query now */
	95
54ed1d64	96	switch (rcode) {
	97	case rcode_noerror:
	98	case rcode_nxdomain:
168e26fe	99	break;
54ed1d64	100	case rcode_formaterror:
7f702335	101	adns__warn(ads,serv,qu,"server cannot understand our query (Format Error)");
11c8bf9b	102	adns__query_fail(qu,adns_s_serverfaulty);
168e26fe	103	return;
5c596e4d	104	case rcode_servfail:
11c8bf9b	105	adns__query_fail(qu,adns_s_servfail);
168e26fe	106	return;
54ed1d64	107	case rcode_notimp:
7f702335	108	adns__warn(ads,serv,qu,"server claims not to implement our query");
11c8bf9b	109	adns__query_fail(qu,adns_s_notimplemented);
54ed1d64	110	return;
54ed1d64	111	case rcode_refused:
7f702335	112	adns__warn(ads,serv,qu,"server refused our query");
11c8bf9b	113	adns__query_fail(qu,adns_s_refused);
54ed1d64	114	return;
54ed1d64	115	default:
7f702335	116	adns__warn(ads,serv,qu,"server gave unknown response code %d",rcode);
11c8bf9b	117	adns__query_fail(qu,adns_s_reasonunknown);
54ed1d64	118	return;
	119	}
	120
	121	/* Now, take a look at the answer section, and see if it is complete.
	122	* If it has any CNAMEs we stuff them in the answer.
	123	*/
	124	wantedrrs= 0;
	125	for (rri= 0; rri<ancount; rri++) {
	126	rrstart= cbyte;
11c8bf9b	127	st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
	128	&rrtype,&rrclass,&rdlength,&rdstart,
	129	&ownermatched);
	130	if (st) adns__query_fail(qu,st);
8312a1c2	131	if (rrtype == -1) goto x_truncated;
8312a1c2	132
54ed1d64	133	if (rrclass != DNS_CLASS_IN) {
7f702335	134	adns__diag(ads,serv,qu,"ignoring answer RR with wrong class %d (expected IN=%d)",
54ed1d64	135	rrclass,DNS_CLASS_IN);
	136	continue;
	137	}
8312a1c2	138	if (!ownermatched) {
5c596e4d	139	if (ads->iflags & adns_if_debug) {
7f702335	140	adns__debug(ads,serv,qu,"ignoring RR with an unexpected owner %s",
11c8bf9b	141	adns__diag_domain(ads,serv,qu, &qu->vb,qu->flags,
11c8bf9b	142	dgram,dglen,rrstart));
8312a1c2	143	}
54ed1d64	144	continue;
54ed1d64	145	}
7f702335	146	if (rrtype == adns_r_cname &&
7f702335	147	(qu->typei->type & adns__rrt_typemask) != adns_r_cname) {
11c8bf9b	148	if (!qu->cname_dgram) { /* Ignore second and subsequent CNAMEs */
	149	qu->cname_dgram= adns__alloc_mine(qu,dglen);
	150	if (!qu->cname_dgram) return;
7f702335	151	qu->cname_begin= rdstart;
7f702335	152	qu->cname_dglen= dglen;
11c8bf9b	153	st= adns__parse_domain(ads,serv,qu, &qu->vb,qu->flags,
7f702335	154	dgram,dglen, &rdstart,rdstart+rdlength);
11c8bf9b	155	if (!qu->vb.used) goto x_truncated;
	156	if (st) { adns__query_fail(qu,st); return; }
	157	l= strlen(qu->vb.buf)+1;
	158	qu->answer->cname= adns__alloc_interim(qu,l);
965c9782	159	if (!qu->answer->cname) return;
11c8bf9b	160	memcpy(qu->answer->cname,qu->vb.buf,l);
7f702335	161	/* If we find the answer section truncated after this point we restart
	162	* the query at the CNAME; if beforehand then we obviously have to use
	163	* TCP. If there is no truncation we can use the whole answer if
	164	* it contains the relevant info.
	165	*/
	166	} else {
	167	adns__debug(ads,serv,qu,"ignoring duplicate CNAME (%s, as well as %s)",
11c8bf9b	168	adns__diag_domain(ads,serv,qu, &qu->vb,qu->flags,
	169	dgram,dglen,rdstart),
	170	qu->answer->cname);
7f702335	171	}
5c596e4d	172	} else if (rrtype == (qu->typei->type & adns__rrt_typemask)) {
54ed1d64	173	wantedrrs++;
54ed1d64	174	} else {
7f702335	175	adns__debug(ads,serv,qu,"ignoring answer RR with irrelevant type %d",rrtype);
54ed1d64	176	}
	177	}
	178
	179	/* If we got here then the answer section is intact. */
	180	nsstart= cbyte;
	181
	182	if (!wantedrrs) {
	183	/* Oops, NODATA or NXDOMAIN or perhaps a referral (which would be a problem) */
	184
	185	if (rcode == rcode_nxdomain) {
11c8bf9b	186	adns__query_fail(qu,adns_s_nxdomain);
54ed1d64	187	return;
	188	}
	189
	190	/* RFC2308: NODATA has _either_ a SOA _or_ _no_ NS records in authority section */
8312a1c2	191	foundsoa= 0; foundns= 0;
54ed1d64	192	for (rri= 0; rri<nscount; rri++) {
8312a1c2	193	rrstart= cbyte;
11c8bf9b	194	st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
	195	&rrtype,&rrclass,&rdlength,&rdstart, 0);
	196	if (st) { adns__query_fail(qu,st); return; }
8312a1c2	197	if (rrtype==-1) goto x_truncated;
8312a1c2	198	if (rrclass != DNS_CLASS_IN) {
7f702335	199	adns__diag(ads,serv,qu,
7f702335	200	"ignoring authority RR with wrong class %d (expected IN=%d)",
8312a1c2	201	rrclass,DNS_CLASS_IN);
	202	continue;
	203	}
	204	if (rrtype == adns_r_soa_raw) { foundsoa= 1; break; }
	205	else if (rrtype == adns_r_ns_raw) { foundns= 1; }
54ed1d64	206	}
8312a1c2	207
	208	if (foundsoa \|\| !foundns) {
	209	/* Aha ! A NODATA response, good. */
11c8bf9b	210	adns__query_fail(qu,adns_s_nodata);
8312a1c2	211	return;
	212	}
	213
	214	/* Now what ? No relevant answers, no SOA, and at least some NS's.
	215	* Looks like a referral. Just one last chance ... if we came across
7f702335	216	* a CNAME in this datagram then we should probably do our own CNAME
7f702335	217	* lookup now in the hope that we won't get a referral again.
8312a1c2	218	*/
11c8bf9b	219	if (qu->cname_dgram == dgram) { cname_recurse(qu,0); return; }
8312a1c2	220
8312a1c2	221	/* Bloody hell, I thought we asked for recursion ? */
7f702335	222	if (flg_rd) {
	223	adns__diag(ads,serv,qu,"server thinks we didn't ask for recursive lookup");
	224	}
8312a1c2	225	if (!flg_ra) {
7f702335	226	adns__diag(ads,serv,qu,"server is not willing to do recursive lookups for us");
11c8bf9b	227	adns__query_fail(qu,adns_s_norecurse);
7f702335	228	} else {
7f702335	229	adns__diag(ads,serv,qu,"server claims to do recursion, but gave us a referral");
11c8bf9b	230	adns__query_fail(qu,adns_s_serverfaulty);
8312a1c2	231	}
54ed1d64	232	return;
	233	}
	234
8312a1c2	235	/* Now, we have some RRs which we wanted. */
54ed1d64	236
11c8bf9b	237	qu->answer->rrs.untyped= adns__alloc_interim(qu,qu->typei->rrsz*wantedrrs);
11c8bf9b	238	if (!qu->answer->rrs.untyped) return;
5c596e4d	239
5c596e4d	240	cbyte= anstart;
5c596e4d	241	arstart= -1;
5c596e4d	242	for (rri=0; rri<ancount; rri++) {
11c8bf9b	243	st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
	244	&rrtype,&rrclass,&rdlength,&rdstart,
	245	&ownermatched);
5c596e4d	246	assert(!st); assert(rrtype != -1);
5c596e4d	247	if (rrclass != DNS_CLASS_IN \|\|
7f702335	248	rrtype != (qu->typei->type & adns__rrt_typemask) \|\|
7f702335	249	!ownermatched)
5c596e4d	250	continue;
11c8bf9b	251	assert(qu->answer->nrrs<wantedrrs);
	252	st= qu->typei->parse(qu,serv,
	253	dgram,dglen, rdstart,rdstart+rdlength,
	254	qu->answer->rrs.bytes+qu->answer->nrrs*qu->typei->rrsz);
	255	if (st) { adns__query_fail(qu,st); return; }
7f702335	256	if (rdstart==-1) goto x_truncated;
5c596e4d	257	}
54ed1d64	258
5c596e4d	259	/* This may have generated some child queries ... */
	260	if (qu->children.head) {
	261	qu->state= query_child;
	262	LIST_LINK_TAIL(ads->childw,qu);
	263	return;
54ed1d64	264	}
168e26fe	265
11c8bf9b	266	adns__query_done(qu);
5c596e4d	267	return;
8312a1c2	268
98db6da3	269	x_truncated:
5c596e4d	270	if (!flg_tc) {
7f702335	271	adns__diag(ads,serv,qu,"server sent datagram which points outside itself");
11c8bf9b	272	adns__query_fail(qu,adns_s_serverfaulty);
5c596e4d	273	return;
5c596e4d	274	}
11c8bf9b	275	if (qu->cname_dgram) { cname_recurse(qu,adns_qf_usevc); return; }
11c8bf9b	276	adns__reset_cnameonly(qu);
5c596e4d	277	qu->flags \|= adns_qf_usevc;
11c8bf9b	278	adns__query_udp(qu,now);
5c596e4d	279	}