chiark / gitweb /
+ * Do not spin if connect() fails immediately (!)
[adns.git] / src / parse.c
index d516d24..7d2730a 100644 (file)
@@ -3,7 +3,12 @@
  * - parsing assistance functions (mainly for domains inside datagrams)
  */
 /*
- *  This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson
+ *  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
@@ -30,18 +35,20 @@ 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;
 }
@@ -63,23 +70,18 @@ void adns__findlabel_start(findlabel_state *fls, adns_state ads,
 
 adns_status adns__findlabel_next(findlabel_state *fls,
                                 int *lablen_r, int *labstart_r) {
-  int lablen, jumped, jumpto;
+  int lablen, 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_serverfaulty;
+    if (fls->cbyte >= fls->max) goto x_badresponse;
     GET_B(fls->cbyte,lablen);
     if (!(lablen & 0x0c0)) break;
-    if ((lablen & 0x0c0) != 0x0c0) return adns_s_unknownreply;
-    if (jumped++) {
-      adns__diag(fls->ads,fls->serv,fls->qu,"compressed datagram contains loop");
-      return adns_s_serverfaulty;
-    }
+    if ((lablen & 0x0c0) != 0x0c0) return adns_s_unknownformat;
     if (fls->cbyte >= fls->dglen) goto x_truncated;
-    if (fls->cbyte >= fls->max) goto x_serverfaulty;
+    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;
@@ -90,84 +92,88 @@ adns_status adns__findlabel_next(findlabel_state *fls,
   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;
   }
   *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_serverfaulty: 
-  adns__diag(fls->ads,fls->serv,fls->qu,"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, adns_query qu,
-                              vbuf *vb, int flags,
-                              const byte *dgram, int dglen, int *cbyte_io, int max) {
+                              vbuf *vb, adns_queryflags flags,
+                              const byte *dgram, int dglen, int *cbyte_io,
+                              int max) {
   findlabel_state fls;
   
-  int lablen, labstart, 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;
 
-  adns__findlabel_start(&fls,ads, serv,qu, 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(vb,".",1)) return adns_s_nolocalmem;
-    if (flags & adns_qf_anyquote) {
+    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_nolocalmem;
+       return adns_s_nomemory;
     } else {
       ch= dgram[labstart];
-      if (!ctype_alpha(ch) && !ctype_digit(ch)) return adns_s_invalidanswerdomain;
+      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_invalidanswerdomain;
+         return adns_s_answerdomaininvalid;
       }
       if (!adns__vbuf_append(vb,dgram+labstart,lablen))
-       return adns_s_nolocalmem;
+       return adns_s_nomemory;
     }
   }
-  if (!adns__vbuf_append(vb,"",1)) return adns_s_nolocalmem;
+  if (!adns__vbuf_append(vb,"",1)) return adns_s_nomemory;
   return adns_s_ok;
 }
        
-static adns_status findrr_intern(adns_query qu, 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) {
-  /* Like adns__findrr_checked, except that the datagram to compare
-   * with can be specified explicitly.
-   *
-   * 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.
-   */
+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;
@@ -176,7 +182,8 @@ static adns_status findrr_intern(adns_query qu, int serv,
 
   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);
+    adns__findlabel_start(&eo_fls,qu->ads, -1,0,
+                         eo_dgram,eo_dglen,eo_dglen,eo_cbyte,0);
     mismatch= 0;
   } else {
     mismatch= 1;
@@ -204,7 +211,11 @@ static adns_status findrr_intern(adns_query qu, int serv,
   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_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;
@@ -219,24 +230,25 @@ static adns_status findrr_intern(adns_query qu, int serv,
 
 adns_status adns__findrr(adns_query qu, int serv,
                         const byte *dgram, int dglen, int *cbyte_io,
-                        int *type_r, int *class_r, int *rdlen_r, int *rdstart_r,
+                        int *type_r, int *class_r, unsigned long *ttl_r,
+                        int *rdlen_r, int *rdstart_r,
                         int *ownermatchedquery_r) {
   if (!ownermatchedquery_r) {
-    return findrr_intern(qu,serv,
-                        dgram,dglen,cbyte_io,
-                        type_r,class_r,rdlen_r,rdstart_r,
-                        0,0,0, 0);
+    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 findrr_intern(qu,serv,
-                        dgram,dglen,cbyte_io,
-                        type_r,class_r,rdlen_r,rdstart_r,
-                        qu->query_dgram,qu->query_dglen,DNS_HDRSIZE,
-                        ownermatchedquery_r);
+    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 findrr_intern(qu,serv,
-                        dgram,dglen,cbyte_io,
-                        type_r,class_r,rdlen_r,rdstart_r,
-                        qu->cname_dgram,qu->cname_dglen,qu->cname_begin,
-                        ownermatchedquery_r);
+    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);
   }
 }