summaryrefslogtreecommitdiffhomepage
path: root/adns-0.6/src/reply.c
diff options
context:
space:
mode:
Diffstat (limited to 'adns-0.6/src/reply.c')
-rw-r--r--adns-0.6/src/reply.c357
1 files changed, 0 insertions, 357 deletions
diff --git a/adns-0.6/src/reply.c b/adns-0.6/src/reply.c
deleted file mode 100644
index 246d52d..0000000
--- a/adns-0.6/src/reply.c
+++ /dev/null
@@ -1,357 +0,0 @@
-/*
- * reply.c
- * - main handling and parsing routine for received datagrams
- */
-/*
- * This file is
- * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
- *
- * It is part of adns, which is
- * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
- * Copyright (C) 1999 Tony Finch <dot@dotat.at>
- *
- * 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 <stdlib.h>
-
-#include "internal.h"
-
-void adns__procdgram(adns_state ads, const byte *dgram, int dglen,
- int serv, int viatcp, 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;
- int anstart, nsstart, arstart;
- int ownermatched, l, nrrs;
- unsigned long ttl, soattl;
- 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);
- 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&0x02;
- 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= viatcp ? ads->tcpw.head : ads->udpw.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;
- if (viatcp) {
- assert(qu->state == query_tcpw);
- } else {
- assert(qu->state == query_tosend);
- if (!(qu->udpsent & (1<<serv))) 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,dgram,dglen,DNS_HDRSIZE));
- adns__vbuf_free(&tempvb);
- }
- return;
- }
- anstart= qu->query_dglen;
- arstart= -1;
-
- if (viatcp) LIST_UNLINK(ads->tcpw,qu);
- else LIST_UNLINK(ads->udpw,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_rcodeformaterror);
- return;
- case rcode_servfail:
- adns__query_fail(qu,adns_s_rcodeservfail);
- return;
- case rcode_notimp:
- adns__warn(ads,serv,qu,"server claims not to implement our query");
- adns__query_fail(qu,adns_s_rcodenotimplemented);
- return;
- case rcode_refused:
- adns__warn(ads,serv,qu,"server refused our query");
- adns__query_fail(qu,adns_s_rcoderefused);
- return;
- default:
- adns__warn(ads,serv,qu,"server gave unknown response code %d",rcode);
- adns__query_fail(qu,adns_s_rcodeunknown);
- 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,&ttl, &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, dgram,dglen,rrstart));
- }
- continue;
- }
- if (rrtype == adns_r_cname &&
- (qu->typei->type & adns__rrt_typemask) != adns_r_cname) {
- if (qu->flags & adns_qf_cname_forbid) {
- adns__query_fail(qu,adns_s_prohibitedcname);
- return;
- } else if (qu->cname_dgram) { /* Ignore second and subsequent CNAME(s) */
- adns__debug(ads,serv,qu,"allegedly canonical name %s is actually alias for %s",
- qu->answer->cname,
- adns__diag_domain(ads,serv,qu, &qu->vb, dgram,dglen,rdstart));
- adns__query_fail(qu,adns_s_prohibitedcname);
- return;
- } else if (wantedrrs) { /* Ignore CNAME(s) after RR(s). */
- adns__debug(ads,serv,qu,"ignoring CNAME (to %s) coexisting with RR",
- adns__diag_domain(ads,serv,qu, &qu->vb, dgram,dglen,rdstart));
- } else {
- qu->cname_begin= rdstart;
- qu->cname_dglen= dglen;
- 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_preserved(qu,l);
- if (!qu->answer->cname) { adns__query_fail(qu,adns_s_nomemory); 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;
- 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
- * it contains the relevant info.
- */
- }
- } else if (rrtype == (qu->typei->type & adns__rrt_typemask)) {
- wantedrrs++;
- } else {
- adns__debug(ads,serv,qu,"ignoring answer RR with irrelevant type %d",rrtype);
- }
- }
-
- /* 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) */
-
- /* RFC2308: NODATA has _either_ a SOA _or_ _no_ NS records in authority section */
- foundsoa= 0; soattl= 0; foundns= 0;
- for (rri= 0; rri<nscount; rri++) {
- rrstart= cbyte;
- st= adns__findrr(qu,serv, dgram,dglen,&cbyte,
- &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) {
- 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; 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;
- }
-
- /* 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) goto x_restartquery;
-
- /* 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_invalidresponse);
- }
- 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) { adns__query_fail(qu,adns_s_nomemory); return; }
-
- typei= qu->typei;
- cbyte= anstart;
- 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,&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;
- nrrs++;
- }
- assert(nrrs==wantedrrs);
- qu->answer->nrrs= nrrs;
-
- /* This may have generated some child queries ... */
- if (qu->children.head) {
- qu->state= query_childw;
- 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_invalidresponse);
- return;
- }
- 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_nomemory); return; }
-
- qu->query_dgram= newquery;
- qu->query_dglen= qu->vb.used;
- memcpy(newquery,qu->vb.buf,qu->vb.used);
- }
-
- if (qu->state == query_tcpw) qu->state= query_tosend;
- qu->retries= 0;
- adns__reset_preserved(qu);
- adns__query_send(qu,now);
-}
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-13 16:24:12 +0000