X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git;a=blobdiff_plain;f=src%2Fparse.c;h=e65a327e3604ab01b334c44d5ba374fdb478299b;hp=957b57232994121321d1daab9632d889d9b5e906;hb=2bd4b9f4167fa254b424385ee430d1402ef087b7;hpb=31144a72ed24e2d3cd62f5f1239e219737beeff4

diff --git a/src/parse.c b/src/parse.c
index 957b572..e65a327 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -1,4 +1,29 @@
-/**/
+/*
+ * parse.c
+ * - parsing assistance functions (mainly for domains inside datagrams)
+ */
+/*
+ *  This file is
+ *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
+ *
+ *  It is part of adns, which is
+ *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
+ *    Copyright (C) 1999-2000 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 "internal.h"
 
@@ -10,27 +35,30 @@ int vbuf__append_quoted1035(vbuf *vb, const byte *buf, int len) {
     qbuf[0]= 0;
     for (i=0; i<len; i++) {
       ch= buf[i];
-      if (ch == '.' || ch == '"' || ch == '(' || ch == ')' ||
-	  ch == '@' || ch == ';' || ch == '$') {
-	sprintf(qbuf,"\\%c",ch);
-	break;
-      } else if (ch <= ' ' || ch >= 127) {
+      if (ch <= ' ' || ch >= 127) {
 	sprintf(qbuf,"\\%03o",ch);
 	break;
+      } else if (!ctype_domainunquoted(ch)) {
+	sprintf(qbuf,"\\%c",ch);
+	break;
       }
     }
-    if (!adns__vbuf_append(vb,buf,i) || !adns__vbuf_append(vb,qbuf,strlen(qbuf)))
+    if (!adns__vbuf_append(vb,buf,i) ||
+	!adns__vbuf_append(vb,qbuf,strlen(qbuf)))
       return 0;
-    buf+= i; len-= i;
+    if (i<len) i++;
+    buf+= i;
+    len-= i;
   }
   return 1;
 }
 
-void adns__findlabel_start(findlabel_state *fls,
-			   adns_state ads, int serv,
+void adns__findlabel_start(findlabel_state *fls, adns_state ads,
+			   int serv, adns_query qu,
 			   const byte *dgram, int dglen, int max,
 			   int dmbegin, int *dmend_rlater) {
   fls->ads= ads;
+  fls->qu= qu;
   fls->serv= serv;
   fls->dgram= dgram;
   fls->dglen= dglen;
@@ -38,41 +66,39 @@ void adns__findlabel_start(findlabel_state *fls,
   fls->cbyte= dmbegin;
   fls->namelen= 0;
   fls->dmend_r= dmend_rlater;
-  fls->namelen_r= namelen_rlater;
 }
 
-adns_status adns__findlabel_next(findlabel_state fls,
+adns_status adns__findlabel_next(findlabel_state *fls,
 				 int *lablen_r, int *labstart_r) {
-  int lablen, jumped;
+  int lablen, jumpto;
+  const char *dgram;
 
-  jumped= 0;
+  dgram= fls->dgram;
   for (;;) {
-    fls->cbyte += 2;
-    if (fls->cbyte > fls->dglen) goto x_truncated;
-    if (fls->cbyte > fls->max) goto x_serverfaulty;
-    GET_W(fls->cbyte-2,lablen);
-    if (!(lablen & 0x0c000)) break;
-    if ((lablen & 0x0c000) != 0x0c000) return adns_s_unknownreply;
-    if (jumped++) {
-      adns__diag(ads,serv,"compressed datagram contains loop");
-      return adns_s_serverfaulty;
-    }
+    if (fls->cbyte >= fls->dglen) goto x_truncated;
+    if (fls->cbyte >= fls->max) goto x_badresponse;
+    GET_B(fls->cbyte,lablen);
+    if (!(lablen & 0x0c0)) break;
+    if ((lablen & 0x0c0) != 0x0c0) return adns_s_unknownformat;
+    if (fls->cbyte >= fls->dglen) goto x_truncated;
+    if (fls->cbyte >= fls->max) goto x_badresponse;
+    GET_B(fls->cbyte,jumpto);
+    jumpto |= (lablen&0x3f)<<8;
     if (fls->dmend_r) *(fls->dmend_r)= fls->cbyte;
-    fls->cbyte= DNS_HDRSIZE+(lablen&0x3fff);
+    fls->cbyte= jumpto;
     fls->dmend_r= 0; fls->max= fls->dglen+1;
   }
+  if (labstart_r) *labstart_r= fls->cbyte;
   if (lablen) {
     if (fls->namelen) fls->namelen++;
     fls->namelen+= lablen;
-    if (fls->namelen > DNS_MAXDOMAIN) return adns_s_domaintoolong;
+    if (fls->namelen > DNS_MAXDOMAIN) return adns_s_answerdomaintoolong;
     fls->cbyte+= lablen;
     if (fls->cbyte > fls->dglen) goto x_truncated;
-    if (fls->cbyte > fls->max) goto x_serverfaulty;
+    if (fls->cbyte > fls->max) goto x_badresponse;
   } else {
     if (fls->dmend_r) *(fls->dmend_r)= fls->cbyte;
-    if (fls->namelen_r) *(fls->namelen_r)= fls->namelen;
   }
-  if (labstart_r) *labstart_r= fls->cbyte;
   *lablen_r= lablen;
   return adns_s_ok;
 
@@ -80,108 +106,84 @@ adns_status adns__findlabel_next(findlabel_state fls,
   *lablen_r= -1;
   return adns_s_ok;
 
- x_serverfaulty: 
-  adns__diag(ads,serv,"label in domain runs beyond end of domain");
-  return adns_s_serverfaulty;
+ x_badresponse: 
+  adns__diag(fls->ads,fls->serv,fls->qu,
+	     "label in domain runs beyond end of domain");
+  return adns_s_invalidresponse;
 }
 
-adns_status adns__parse_domain(adns_state ads, int serv, vbuf *vb, int flags,
-			       const byte *dgram, int dglen,
-			       int *cbyte_io, int max) {
+adns_status adns__parse_domain(adns_state ads, int serv, adns_query qu,
+			       vbuf *vb, parsedomain_flags flags,
+			       const byte *dgram, int dglen, int *cbyte_io,
+			       int max) {
   findlabel_state fls;
   
-  int cbyte, lablen, labstart, namelen, i, ch;
+  adns__findlabel_start(&fls,ads, serv,qu, dgram,dglen,max,
+			*cbyte_io,cbyte_io);
+  vb->used= 0;
+  return adns__parse_domain_more(&fls,ads,qu, vb,flags,dgram);
+}
+
+adns_status adns__parse_domain_more(findlabel_state *fls, adns_state ads,
+				    adns_query qu, vbuf *vb,
+				    parsedomain_flags flags,
+				    const byte *dgram) {
+  int lablen, labstart, i, ch, first;
   adns_status st;
 
-  ands__findlabel_start(&fls,ads,serv, dgram,dglen,max, *cbyte_io,cbyte_io);
-  vb->used= 0;
+  first= 1;
   for (;;) {
-    st= adns__findlabel_next(&fls,&lablen,&labstart);
+    st= adns__findlabel_next(fls,&lablen,&labstart);
     if (st) return st;
     if (lablen<0) { vb->used=0; return adns_s_ok; }
     if (!lablen) break;
-    if (vb->used)
-      if (!adns__vbuf_append(&qu->ans,".",1)) return adns_s_nolocalmem;
-    if (flags & adns_qf_anyquote) {
-      if (!vbuf__append_quoted1035(&qu->ans,dgram+labstart,lablen))
-	return adns_s_nolocalmem;
+    if (first) {
+      first= 0;
+    } else {
+      if (!adns__vbuf_append(vb,".",1)) return adns_s_nomemory;
+    }
+    if (flags & pdf_quoteok) {
+      if (!vbuf__append_quoted1035(vb,dgram+labstart,lablen))
+	return adns_s_nomemory;
     } else {
-      if (!ctype_alpha(dgram[labstart])) return adns_s_invaliddomain;
+      ch= dgram[labstart];
+      if (!ctype_alpha(ch) && !ctype_digit(ch))
+	return adns_s_answerdomaininvalid;
       for (i= labstart+1; i<labstart+lablen; i++) {
 	ch= dgram[i];
 	if (ch != '-' && !ctype_alpha(ch) && !ctype_digit(ch))
-	  return adns_s_invaliddomain;
+	  return adns_s_answerdomaininvalid;
       }
-      if (!adns__vbuf_append(&qu->ans,dgram+labstart,lablen))
-	return adns_s_nolocalmem;
+      if (!adns__vbuf_append(vb,dgram+labstart,lablen))
+	return adns_s_nomemory;
     }
   }
-  if (!adns__vbuf_append(&qu->ans,"",1)) return adns_s_nolocalmem;
+  if (!adns__vbuf_append(vb,"",1)) return adns_s_nomemory;
   return adns_s_ok;
 }
 	
-const char *adns__diag_domain(adns_state ads, int serv, vbuf *vb, int flags,
-			      const byte *dgram, int dglen, int cbyte) {
-  adns_status st;
-
-  st= adns__parse_domain(ads,serv,vb,qu->flags, dgram,dglen, &cbyte,dglen);
-  if (st) {
-    vb->used= 0;
-    adns__vbuf_appendstr(vb,"<bad format... ");
-    adns__vbuf_appendstr(vb,adns_strerror(st));
-    adns__vbuf_appendstr(vb,">");
-    adns__vbuf_append(vb,"",1);
-  }
-  if (!vb.used) {
-    adns__vbuf_appendstr(vb,"<truncated ...>");
-    adns__vbuf_append(vb,"",1);
-  }
-  return vb->buf;
-}
-    
-adns_status adns__findrr(adns_state ads, int serv,
-			 const byte *dgram, int dglen, int *cbyte_io,
-			 int *type_r, int *class_r, int *rdlen_r, int *rdstart_r,
-			 const byte *eo_dgram, int eo_dglen, int eo_cbyte,
-			 int *eo_matched_r) {
-  /* Finds the extent and some of the contents of an RR in a datagram
-   * and does some checks.  The datagram is *dgram, length dglen, and
-   * the RR starts at *cbyte_io (which is updated afterwards to point
-   * to the end of the RR).
-   *
-   * The type, class and RRdata length and start are returned iff
-   * the corresponding pointer variables are not null.  type_r and
-   * class_r may not be null.
-   *
-   * If the caller thinks they know what the owner of the RR ought to
-   * be they can pass in details in eo_*: this is another (or perhaps
-   * the same datagram), and a pointer to where the putative owner
-   * starts in that datagram.  In this case *eo_matched_r will be set
-   * to 1 if the datagram matched or 0 if it did not.  Either
-   * both eo_dgram and eo_matched_r must both be non-null, or they
-   * must both be null (in which case eo_dglen and eo_cbyte will be ignored).
-   * The eo datagram and contained owner domain MUST be valid and
-   * untruncated.
-   *
-   * If there is truncation then *type_r will be set to -1 and
-   * *cbyte_io, *class_r, *rdlen_r, *rdstart_r and *eo_matched_r will be
-   * undefined.
-   *
-   * If an error is returned then *type_r will be undefined too.
-   */
+adns_status adns__findrr_anychk(adns_query qu, int serv,
+				const byte *dgram, int dglen, int *cbyte_io,
+				int *type_r, int *class_r,
+				unsigned long *ttl_r,
+				int *rdlen_r, int *rdstart_r,
+				const byte *eo_dgram, int eo_dglen,
+				int eo_cbyte, int *eo_matched_r) {
   findlabel_state fls, eo_fls;
   int cbyte;
   
   int tmp, rdlen, mismatch;
-  int max, lablen, labstart, namelen, ch;
-  int eo_max, eo_lablen, eo_labstart, eo_namelen, eo_ch;
+  unsigned long ttl;
+  int lablen, labstart, ch;
+  int eo_lablen, eo_labstart, eo_ch;
   adns_status st;
 
   cbyte= *cbyte_io;
 
-  ands__findlabel_start(&fls,ads,serv, dgram,dglen,dglen,cbyte,&cbyte);
+  adns__findlabel_start(&fls,qu->ads, serv,qu, dgram,dglen,dglen,cbyte,&cbyte);
   if (eo_dgram) {
-    ands__findlabel_start(&eo_fls,ads,serv, eo_dgram,eo_dglen,eo_dglen,eo_cbyte,0);
+    adns__findlabel_start(&eo_fls,qu->ads, -1,0,
+			  eo_dgram,eo_dglen,eo_dglen,eo_cbyte,0);
     mismatch= 0;
   } else {
     mismatch= 1;
@@ -196,20 +198,25 @@ adns_status adns__findrr(adns_state ads, int serv,
       st= adns__findlabel_next(&eo_fls,&eo_lablen,&eo_labstart);
       assert(!st); assert(eo_lablen>=0);
       if (lablen != eo_lablen) mismatch= 1;
-      while (!mismatch && lablen-- > 0) {
+      while (!mismatch && eo_lablen-- > 0) {
 	ch= dgram[labstart++]; if (ctype_alpha(ch)) ch &= ~32;
 	eo_ch= eo_dgram[eo_labstart++]; if (ctype_alpha(eo_ch)) eo_ch &= ~32;
 	if (ch != eo_ch) mismatch= 1;
       }
     }
+    if (!lablen) break;
   }
   if (eo_matched_r) *eo_matched_r= !mismatch;
    
   if (cbyte+10>dglen) goto x_truncated;
   GET_W(cbyte,tmp); *type_r= tmp;
   GET_W(cbyte,tmp); *class_r= tmp;
-  cbyte+= 4; /* we skip the TTL */
-  GET_W(cbyte,rdlen); if (rdlen_r) *rdlen_r= tmp;
+
+  GET_L(cbyte,ttl);
+  if (ttl > MAXTTLBELIEVE) ttl= MAXTTLBELIEVE;
+  *ttl_r= ttl;
+  
+  GET_W(cbyte,rdlen); if (rdlen_r) *rdlen_r= rdlen;
   if (rdstart_r) *rdstart_r= cbyte;
   cbyte+= rdlen;
   if (cbyte>dglen) goto x_truncated;
@@ -218,5 +225,30 @@ adns_status adns__findrr(adns_state ads, int serv,
 
  x_truncated:
   *type_r= -1;
-  return 0;;
+  return 0;
+}
+
+adns_status adns__findrr(adns_query qu, int serv,
+			 const byte *dgram, int dglen, int *cbyte_io,
+			 int *type_r, int *class_r, unsigned long *ttl_r,
+			 int *rdlen_r, int *rdstart_r,
+			 int *ownermatchedquery_r) {
+  if (!ownermatchedquery_r) {
+    return adns__findrr_anychk(qu,serv,
+			       dgram,dglen,cbyte_io,
+			       type_r,class_r,ttl_r,rdlen_r,rdstart_r,
+			       0,0,0, 0);
+  } else if (!qu->cname_dgram) {
+    return adns__findrr_anychk(qu,serv,
+			       dgram,dglen,cbyte_io,
+			       type_r,class_r,ttl_r,rdlen_r,rdstart_r,
+			       qu->query_dgram,qu->query_dglen,DNS_HDRSIZE,
+			       ownermatchedquery_r);
+  } else {
+    return adns__findrr_anychk(qu,serv,
+			       dgram,dglen,cbyte_io,
+			       type_r,class_r,ttl_r,rdlen_r,rdstart_r,
+			       qu->cname_dgram,qu->cname_dglen,qu->cname_begin,
+			       ownermatchedquery_r);
+  }
 }