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1 files changed, 253 insertions, 0 deletions

diff --git a/adns-0.6/src/parse.c b/adns-0.6/src/parse.c
new file mode 100644
index 0000000..9a4e0c7
--- /dev/null
+++ b/adns-0.6/src/parse.c
@@ -0,0 +1,253 @@
+/*
+ * parse.c
+ * - parsing assistance functions (mainly for domains inside 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 "internal.h"
+
+int vbuf__append_quoted1035(vbuf *vb, const byte *buf, int len) {
+  char qbuf[10];
+  int i, ch;
+  
+  while (len) {
+    qbuf[0]= 0;
+    for (i=0; i<len; i++) {
+      ch= buf[i];
+      if (ch == '.' || ch == '"' || ch == '(' || ch == ')' ||
+	  ch == '@' || ch == ';' || ch == '$' || ch == '\\') {
+	sprintf(qbuf,"\\%c",ch);
+	break;
+      } else if (ch <= ' ' || ch >= 127) {
+	sprintf(qbuf,"\\%03o",ch);
+	break;
+      }
+    }
+    if (!adns__vbuf_append(vb,buf,i) || !adns__vbuf_append(vb,qbuf,strlen(qbuf)))
+      return 0;
+    if (i<len) i++;
+    buf+= i;
+    len-= i;
+  }
+  return 1;
+}
+
+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;
+  fls->max= max;
+  fls->cbyte= dmbegin;
+  fls->namelen= 0;
+  fls->dmend_r= dmend_rlater;
+}
+
+adns_status adns__findlabel_next(findlabel_state *fls,
+				 int *lablen_r, int *labstart_r) {
+  int lablen, jumped, jumpto;
+  const char *dgram;
+
+  jumped= 0;
+  dgram= fls->dgram;
+  for (;;) {
+    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 (jumped++) {
+      adns__diag(fls->ads,fls->serv,fls->qu,"compressed datagram contains loop");
+      return adns_s_invalidresponse;
+    }
+    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= 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_answerdomaintoolong;
+    fls->cbyte+= lablen;
+    if (fls->cbyte > fls->dglen) goto x_truncated;
+    if (fls->cbyte > fls->max) goto x_badresponse;
+  } else {
+    if (fls->dmend_r) *(fls->dmend_r)= fls->cbyte;
+  }
+  *lablen_r= lablen;
+/*if (labstart_r) fprintf(stderr,"label %d >%.*s<\n",lablen,lablen,fls->dgram+*labstart_r);*/
+  return adns_s_ok;
+
+ x_truncated:
+  *lablen_r= -1;
+  return adns_s_ok;
+
+ 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, adns_query qu,
+			       vbuf *vb, adns_queryflags flags,
+			       const byte *dgram, int dglen, int *cbyte_io, int max) {
+  findlabel_state fls;
+  
+  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;
+
+  first= 1;
+  for (;;) {
+    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 (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 {
+      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_answerdomaininvalid;
+      }
+      if (!adns__vbuf_append(vb,dgram+labstart,lablen))
+	return adns_s_nomemory;
+    }
+  }
+  if (!adns__vbuf_append(vb,"",1)) return adns_s_nomemory;
+  return adns_s_ok;
+}
+	
+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;
+  unsigned long ttl;
+  int lablen, labstart, ch;
+  int eo_lablen, eo_labstart, eo_ch;
+  adns_status st;
+
+  cbyte= *cbyte_io;
+
+  adns__findlabel_start(&fls,qu->ads, serv,qu, dgram,dglen,dglen,cbyte,&cbyte);
+  if (eo_dgram) {
+    adns__findlabel_start(&eo_fls,qu->ads, -1,0, eo_dgram,eo_dglen,eo_dglen,eo_cbyte,0);
+    mismatch= 0;
+  } else {
+    mismatch= 1;
+  }
+  
+  for (;;) {
+    st= adns__findlabel_next(&fls,&lablen,&labstart);
+    if (st) return st;
+    if (lablen<0) goto x_truncated;
+
+    if (!mismatch) {
+      st= adns__findlabel_next(&eo_fls,&eo_lablen,&eo_labstart);
+      assert(!st); assert(eo_lablen>=0);
+      if (lablen != eo_lablen) mismatch= 1;
+      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;
+
+  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;
+  *cbyte_io= cbyte;
+  return adns_s_ok;
+
+ x_truncated:
+  *type_r= -1;
+  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);
+  }
+}