* - 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 part of adns, which is
+ * Copyright (C) 1997-2000,2003,2006,2014 Ian Jackson
+ * Copyright (C) 2014 Mark Wooding
+ * Copyright (C) 1999-2000,2003,2006 Tony Finch
+ * Copyright (C) 1991 Massachusetts Institute of Technology
+ * (See the file INSTALL for full details.)
*
* 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)
+ * the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* 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.
+ * along with this program; if not, write to the Free Software Foundation.
*/
#include "internal.h"
-int vbuf__append_quoted1035(vbuf *vb, const byte *buf, int len) {
+static int vbuf_append_quoted1035(vbuf *vb, const byte *buf, int len) {
char qbuf[10];
int i, ch;
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;
}
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;
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, parsedomain_flags 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 (!vbuf__append_quoted1035(vb,dgram+labstart,lablen))
- return adns_s_nolocalmem;
+ if (first) {
+ first= 0;
} else {
- if (!ctype_alpha(dgram[labstart])) return adns_s_invaliddomain;
+ 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_invaliddomain;
+ 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.
- */
- findlabel_state fls, eo_fls;
+
+bool adns__labels_equal(const byte *a, int al, const byte *b, int bl) {
+ if (al != bl) return 0;
+ while (al-- > 0) {
+ int ac= ctype_toupper(*a++);
+ int bc= ctype_toupper(*b++);
+ if (ac != bc) return 0;
+ }
+ return 1;
+}
+
+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_buf;
+ findlabel_state *eo_fls; /* 0 iff we know it's not matching eo_... */
int cbyte;
- int tmp, rdlen, mismatch;
- int lablen, labstart, ch;
- int eo_lablen, eo_labstart, eo_ch;
+ int tmp, rdlen;
+ unsigned long ttl;
+ int lablen, labstart;
+ int eo_lablen, eo_labstart;
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;
+ eo_fls= &eo_fls_buf;
+ adns__findlabel_start(eo_fls,qu->ads, -1,0,
+ eo_dgram,eo_dglen,eo_dglen,eo_cbyte,0);
} else {
- mismatch= 1;
+ eo_fls= 0;
}
for (;;) {
if (st) return st;
if (lablen<0) goto x_truncated;
- if (!mismatch) {
- st= adns__findlabel_next(&eo_fls,&eo_lablen,&eo_labstart);
+ if (eo_fls) {
+ 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 (!adns__labels_equal(dgram+labstart, lablen,
+ eo_dgram+eo_labstart, eo_lablen))
+ eo_fls= 0;
}
if (!lablen) break;
}
- if (eo_matched_r) *eo_matched_r= !mismatch;
+ if (eo_matched_r) *eo_matched_r= !!eo_fls;
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;
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);
}
}
~ianmdlvl / adns.git / blobdiff