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-rw-r--r--adns-0.6/src/parse.c253
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);
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-05 05:40:44 +0000