[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) {
  assert(!"cname not implemented"); /* FIXME */
}
    
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 anstart, nsstart, arstart;
  adns_query qu, nqu;
  dns_rcode rcode;
  adns_status st;
  vbuf tempvb;
  
  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= (f2&0x0f);

  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,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;
  }
  if (!qu) {
    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));
      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 */
  
  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;
  cbyte= anstart;
  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); return; }
    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);
	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
	 * 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 (cname_here) { 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;
    qu->answer->nrrs++;
  }

  /* 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
e576be50	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	*/
4353a5c4	22
	23	#include "internal.h"
	24
3955725c	25	static void cname_recurse(adns_query qu, adns_queryflags xflags) {
86e7b8d9	26	assert(!"cname not implemented"); /* FIXME */
b9de380c	27	}
b9de380c	28
98a3f706	29	void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
98a3f706	30	int serv, struct timeval now) {
86e7b8d9	31	int cbyte, rrstart, wantedrrs, rri, foundsoa, foundns, cname_here;
3955725c	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;
98a3f706	35	int anstart, nsstart, arstart;
98a3f706	36	adns_query qu, nqu;
98a3f706	37	dns_rcode rcode;
b9de380c	38	adns_status st;
86e7b8d9	39	vbuf tempvb;
ec477b9e	40
98a3f706	41	if (dglen<DNS_HDRSIZE) {
3955725c	42	adns__diag(ads,serv,0,"received datagram too short for message header (%d)",dglen);
ec477b9e	43	return;
ec477b9e	44	}
9557e604	45	cbyte= 0;
b9de380c	46	GET_W(cbyte,id);
	47	GET_B(cbyte,f1);
	48	GET_B(cbyte,f2);
	49	GET_W(cbyte,qdcount);
	50	GET_W(cbyte,ancount);
	51	GET_W(cbyte,nscount);
	52	GET_W(cbyte,arcount);
98a3f706	53	assert(cbyte == DNS_HDRSIZE);
ec477b9e	54
31144a72	55	flg_qr= f1&0x80;
31144a72	56	opcode= (f1&0x78)>>3;
98a3f706	57	flg_tc= f1&0x20;
31144a72	58	flg_rd= f1&0x01;
0ba0614a	59	flg_ra= f2&0x80;
86e7b8d9	60	rcode= (f2&0x0f);
0ba0614a	61
86e7b8d9	62	cname_here= 0;
86e7b8d9	63
9557e604	64	if (!flg_qr) {
3955725c	65	adns__diag(ads,serv,0,"server sent us a query, not a response");
ec477b9e	66	return;
ec477b9e	67	}
31144a72	68	if (opcode) {
3955725c	69	adns__diag(ads,serv,0,"server sent us unknown opcode %d (wanted 0=QUERY)",opcode);
ec477b9e	70	return;
	71	}
	72	if (!qdcount) {
3955725c	73	adns__diag(ads,serv,0,"server sent reply without quoting our question");
ec477b9e	74	return;
ec477b9e	75	} else if (qdcount>1) {
3955725c	76	adns__diag(ads,serv,0,"server claimed to answer %d questions with one message",
ec477b9e	77	qdcount);
	78	return;
	79	}
98a3f706	80	for (qu= ads->timew.head; qu; qu= nqu) {
ec477b9e	81	nqu= qu->next;
ec477b9e	82	if (qu->id != id) continue;
3955725c	83	if (dglen < qu->query_dglen) continue;
	84	if (memcmp(qu->query_dgram+DNS_HDRSIZE,
	85	dgram+DNS_HDRSIZE,
	86	qu->query_dglen-DNS_HDRSIZE))
b9de380c	87	continue;
ec477b9e	88	break;
	89	}
	90	if (!qu) {
86e7b8d9	91	if (ads->iflags & adns_if_debug) {
	92	adns__vbuf_init(&tempvb);
	93	adns__debug(ads,serv,0,"reply not found, id %02x, query owner %s",
	94	id, adns__diag_domain(ads,serv,0,&tempvb,adns_qf_anyquote,
	95	dgram,dglen,DNS_HDRSIZE));
	96	adns__vbuf_free(&tempvb);
	97	}
ec477b9e	98	return;
ec477b9e	99	}
86e7b8d9	100	anstart= qu->query_dglen;
98a3f706	101
	102	LIST_UNLINK(ads->timew,qu);
	103	/* We're definitely going to do something with this query now */
	104
b9de380c	105	switch (rcode) {
	106	case rcode_noerror:
	107	case rcode_nxdomain:
ec477b9e	108	break;
b9de380c	109	case rcode_formaterror:
31144a72	110	adns__warn(ads,serv,qu,"server cannot understand our query (Format Error)");
3955725c	111	adns__query_fail(qu,adns_s_serverfaulty);
ec477b9e	112	return;
98a3f706	113	case rcode_servfail:
3955725c	114	adns__query_fail(qu,adns_s_servfail);
ec477b9e	115	return;
b9de380c	116	case rcode_notimp:
31144a72	117	adns__warn(ads,serv,qu,"server claims not to implement our query");
3955725c	118	adns__query_fail(qu,adns_s_notimplemented);
b9de380c	119	return;
b9de380c	120	case rcode_refused:
31144a72	121	adns__warn(ads,serv,qu,"server refused our query");
3955725c	122	adns__query_fail(qu,adns_s_refused);
b9de380c	123	return;
b9de380c	124	default:
31144a72	125	adns__warn(ads,serv,qu,"server gave unknown response code %d",rcode);
3955725c	126	adns__query_fail(qu,adns_s_reasonunknown);
b9de380c	127	return;
	128	}
	129
	130	/* Now, take a look at the answer section, and see if it is complete.
	131	* If it has any CNAMEs we stuff them in the answer.
	132	*/
	133	wantedrrs= 0;
86e7b8d9	134	cbyte= anstart;
b9de380c	135	for (rri= 0; rri<ancount; rri++) {
b9de380c	136	rrstart= cbyte;
3955725c	137	st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
	138	&rrtype,&rrclass,&rdlength,&rdstart,
	139	&ownermatched);
86e7b8d9	140	if (st) { adns__query_fail(qu,st); return; }
0ba0614a	141	if (rrtype == -1) goto x_truncated;
0ba0614a	142
b9de380c	143	if (rrclass != DNS_CLASS_IN) {
31144a72	144	adns__diag(ads,serv,qu,"ignoring answer RR with wrong class %d (expected IN=%d)",
b9de380c	145	rrclass,DNS_CLASS_IN);
	146	continue;
	147	}
0ba0614a	148	if (!ownermatched) {
98a3f706	149	if (ads->iflags & adns_if_debug) {
31144a72	150	adns__debug(ads,serv,qu,"ignoring RR with an unexpected owner %s",
3955725c	151	adns__diag_domain(ads,serv,qu, &qu->vb,qu->flags,
3955725c	152	dgram,dglen,rrstart));
0ba0614a	153	}
b9de380c	154	continue;
b9de380c	155	}
31144a72	156	if (rrtype == adns_r_cname &&
31144a72	157	(qu->typei->type & adns__rrt_typemask) != adns_r_cname) {
3955725c	158	if (!qu->cname_dgram) { /* Ignore second and subsequent CNAMEs */
	159	qu->cname_dgram= adns__alloc_mine(qu,dglen);
	160	if (!qu->cname_dgram) return;
31144a72	161	qu->cname_begin= rdstart;
31144a72	162	qu->cname_dglen= dglen;
3955725c	163	st= adns__parse_domain(ads,serv,qu, &qu->vb,qu->flags,
31144a72	164	dgram,dglen, &rdstart,rdstart+rdlength);
3955725c	165	if (!qu->vb.used) goto x_truncated;
	166	if (st) { adns__query_fail(qu,st); return; }
	167	l= strlen(qu->vb.buf)+1;
	168	qu->answer->cname= adns__alloc_interim(qu,l);
8e5b0abb	169	if (!qu->answer->cname) return;
3955725c	170	memcpy(qu->answer->cname,qu->vb.buf,l);
86e7b8d9	171	cname_here= 1;
31144a72	172	/* If we find the answer section truncated after this point we restart
	173	* the query at the CNAME; if beforehand then we obviously have to use
	174	* TCP. If there is no truncation we can use the whole answer if
	175	* it contains the relevant info.
	176	*/
	177	} else {
	178	adns__debug(ads,serv,qu,"ignoring duplicate CNAME (%s, as well as %s)",
3955725c	179	adns__diag_domain(ads,serv,qu, &qu->vb,qu->flags,
	180	dgram,dglen,rdstart),
	181	qu->answer->cname);
31144a72	182	}
98a3f706	183	} else if (rrtype == (qu->typei->type & adns__rrt_typemask)) {
b9de380c	184	wantedrrs++;
b9de380c	185	} else {
31144a72	186	adns__debug(ads,serv,qu,"ignoring answer RR with irrelevant type %d",rrtype);
b9de380c	187	}
	188	}
	189
	190	/* If we got here then the answer section is intact. */
	191	nsstart= cbyte;
	192
	193	if (!wantedrrs) {
	194	/* Oops, NODATA or NXDOMAIN or perhaps a referral (which would be a problem) */
	195
	196	if (rcode == rcode_nxdomain) {
3955725c	197	adns__query_fail(qu,adns_s_nxdomain);
b9de380c	198	return;
	199	}
	200
	201	/* RFC2308: NODATA has _either_ a SOA _or_ _no_ NS records in authority section */
0ba0614a	202	foundsoa= 0; foundns= 0;
b9de380c	203	for (rri= 0; rri<nscount; rri++) {
0ba0614a	204	rrstart= cbyte;
3955725c	205	st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
	206	&rrtype,&rrclass,&rdlength,&rdstart, 0);
	207	if (st) { adns__query_fail(qu,st); return; }
0ba0614a	208	if (rrtype==-1) goto x_truncated;
0ba0614a	209	if (rrclass != DNS_CLASS_IN) {
31144a72	210	adns__diag(ads,serv,qu,
31144a72	211	"ignoring authority RR with wrong class %d (expected IN=%d)",
0ba0614a	212	rrclass,DNS_CLASS_IN);
	213	continue;
	214	}
	215	if (rrtype == adns_r_soa_raw) { foundsoa= 1; break; }
	216	else if (rrtype == adns_r_ns_raw) { foundns= 1; }
b9de380c	217	}
0ba0614a	218
	219	if (foundsoa \|\| !foundns) {
	220	/* Aha ! A NODATA response, good. */
3955725c	221	adns__query_fail(qu,adns_s_nodata);
0ba0614a	222	return;
	223	}
	224
	225	/* Now what ? No relevant answers, no SOA, and at least some NS's.
	226	* Looks like a referral. Just one last chance ... if we came across
31144a72	227	* a CNAME in this datagram then we should probably do our own CNAME
31144a72	228	* lookup now in the hope that we won't get a referral again.
0ba0614a	229	*/
86e7b8d9	230	if (cname_here) { cname_recurse(qu,0); return; }
0ba0614a	231
0ba0614a	232	/* Bloody hell, I thought we asked for recursion ? */
31144a72	233	if (flg_rd) {
	234	adns__diag(ads,serv,qu,"server thinks we didn't ask for recursive lookup");
	235	}
0ba0614a	236	if (!flg_ra) {
31144a72	237	adns__diag(ads,serv,qu,"server is not willing to do recursive lookups for us");
3955725c	238	adns__query_fail(qu,adns_s_norecurse);
31144a72	239	} else {
31144a72	240	adns__diag(ads,serv,qu,"server claims to do recursion, but gave us a referral");
3955725c	241	adns__query_fail(qu,adns_s_serverfaulty);
0ba0614a	242	}
b9de380c	243	return;
	244	}
	245
0ba0614a	246	/* Now, we have some RRs which we wanted. */
b9de380c	247
3955725c	248	qu->answer->rrs.untyped= adns__alloc_interim(qu,qu->typei->rrsz*wantedrrs);
3955725c	249	if (!qu->answer->rrs.untyped) return;
98a3f706	250
98a3f706	251	cbyte= anstart;
98a3f706	252	arstart= -1;
98a3f706	253	for (rri=0; rri<ancount; rri++) {
3955725c	254	st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
	255	&rrtype,&rrclass,&rdlength,&rdstart,
	256	&ownermatched);
98a3f706	257	assert(!st); assert(rrtype != -1);
98a3f706	258	if (rrclass != DNS_CLASS_IN \|\|
31144a72	259	rrtype != (qu->typei->type & adns__rrt_typemask) \|\|
31144a72	260	!ownermatched)
98a3f706	261	continue;
3955725c	262	assert(qu->answer->nrrs<wantedrrs);
	263	st= qu->typei->parse(qu,serv,
	264	dgram,dglen, rdstart,rdstart+rdlength,
	265	qu->answer->rrs.bytes+qu->answer->nrrs*qu->typei->rrsz);
	266	if (st) { adns__query_fail(qu,st); return; }
31144a72	267	if (rdstart==-1) goto x_truncated;
86e7b8d9	268	qu->answer->nrrs++;
98a3f706	269	}
b9de380c	270
98a3f706	271	/* This may have generated some child queries ... */
	272	if (qu->children.head) {
	273	qu->state= query_child;
	274	LIST_LINK_TAIL(ads->childw,qu);
	275	return;
b9de380c	276	}
ec477b9e	277
3955725c	278	adns__query_done(qu);
98a3f706	279	return;
0ba0614a	280
e576be50	281	x_truncated:
98a3f706	282	if (!flg_tc) {
31144a72	283	adns__diag(ads,serv,qu,"server sent datagram which points outside itself");
3955725c	284	adns__query_fail(qu,adns_s_serverfaulty);
98a3f706	285	return;
98a3f706	286	}
3955725c	287	if (qu->cname_dgram) { cname_recurse(qu,adns_qf_usevc); return; }
3955725c	288	adns__reset_cnameonly(qu);
98a3f706	289	qu->flags \|= adns_qf_usevc;
3955725c	290	adns__query_udp(qu,now);
98a3f706	291	}