+#define GETIL_B(cb) (dgram[*(cb)++])
+#define GET_B(cb,tv) ((tv)= GETIL_B((cb)))
+#define GET_W(cb,tv) ((tv)=0, (tv)|=(GETIL_B((cb))<<8), (tv)|=GETIL_B(cb), (tv))
+
+static void vbuf__append_quoted1035(vbuf *vb, const byte *buf, int len) {
+ char qbuf[10];
+ int i;
+
+ while (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) {
+ sprintf(qbuf,"\\%03o",ch);
+ break;
+ }
+ }
+ if (!adns__vbuf_append(vb,buf,i) || !adns__vbuf_append(vb,qbuf,strlen(qbuf)))
+ return adns_s_nolocalmem;
+ buf+= i; len-= i;
+ }
+}
+
+static adns_status get_label(const byte *dgram, int dglen, int *max_io,
+ int *cbyte_io, int *lablen_r, int *labstart_r,
+ int *namelen_io) {
+ /* If succeeds, *lablen_r may be set to -1 to indicate truncation/overrun */
+ int max, cbyte, lablen, namelen;
+
+ max= *max_io;
+ cbyte= *cbyte_io;
+
+ for (;;) {
+ if (cbyte+2 > max) goto x_truncated;
+ GET_W(cbyte,lablen);
+ if (!(lablen & 0x0c000)) break;
+ if ((lablen & 0x0c000) != 0x0c000) return adns_s_unknownreply;
+ if (cbyte_io) { *cbyte_io= cbyte; cbyte_io= 0; }
+ cbyte= dgram+DNS_HDR_SIZE+(lablen&0x3fff);
+ *max_io= max= dglen;
+ }
+ if (labstart_r) *labstart_r= cbyte;
+ if (lablen) {
+ namelen= *namelen_io;
+ if (namelen) namelen++;
+ namelen+= lablen;
+ if (namelen > DNS_MAXDOMAIN) return adns_s_domaintoolong;
+ *namelen_io= namelen;
+ cbyte+= lablen;
+ if (cbyte > max) goto x_truncated;
+ }
+ if (cbyte_io) *cbyte_io= cbyte;
+ *lablen_r= lablen;
+ return adns_s_ok;
+
+ x_truncated:
+ *lablen_r= -1;
+ return adns_s_ok;
+}
+
+static adns_status get_domain_perm(adns_state ads, adns_query qu, int serv,
+ const byte *dgram, int dglen,
+ int *cbyte_io, int max, char **domain_r) {
+ /* Returns 0 for OK (*domain_r set) or truncated (*domain_r null)
+ * or any other adns_s_* value.
+ */
+ int cbyte, sused, lablen, namelen;
+
+ /* If we follow a pointer we set cbyte_io to 0 to indicate that
+ * we've lost our original starting and ending points; we don't
+ * put the end of the pointed-to thing into the original *cbyte_io.
+ */
+ cbyte= *cbyte_io;
+ sused= qu->ans.used;
+ *domain_r= 0;
+ namelen= 0;
+ for (;;) {
+ st= get_label(dgram,dglen,&max, &cbyte,&lablen,&labstart,&namelen);
+ if (st) return st;
+ if (lablen<0) goto x_truncated;
+ if (!lablen) break;
+ if (qu->ans.used != sused)
+ if (!adns__vbuf_append(&qu->ans,".",1)) return adns_s_nolocalmem;
+ if (qu->flags & adns_qf_anyquote) {
+ if (!vbuf__append_quoted1035(&qu->ans,dgram+labstart,lablen))
+ return adns_s_nolocalmem;
+ } else {
+ if (!ctype_isalpha(dgram[labstart])) return adns_s_invaliddomain;
+ for (i= cbyte+1; i<cbyte+lablen; i++) {
+ ch= dgram[cbyte];
+ if (ch != '-' && !ctype_isalpha(ch) && !ctype_isdigit(ch))
+ return adns_s_invaliddomain;
+ }
+ if (!adns__vbuf_append(&qu->ans,dgram+labstart,lablen))
+ return adns_s_nolocalmem;
+ }
+ }
+ if (cbyte_io) *cbyte_io= cbyte;
+ if (!adns__vbuf_append(&qu->ans,"",1)) return adns_s_nolocalmem;
+ *domain_r= qu->ans.buf+sused;
+ return adns_s_ok;
+
+ x_truncated:
+ return cbyte_io ? -1 : adns_s_serverfaulty;
+}
+
+static adns_status get_domain_temp(adns_state ads, adns_query qu, int serv,
+ const byte *dgram, int dglen,
+ int *cbyte_io, int max, char **domain_r) {
+ int sused;
+ adns_status st;
+
+ sused= qu->ans.used;
+ st= get_domain_perm(ads,qu,serv,dgram,dglen,cbyte_io,max,domain_r);
+ qu->ans.used= sused;
+ return st;
+}
+
+static adns_status get_rr_temp(adns_state ads, 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) {
+ /* _s_ok can have *type_r == -1 and other output invalid, for truncation
+ * type_r and class_r must be !0, other _r may be 0.
+ * eo_dgram==0 for no comparison, otherwise all eo_ must be valid.
+ */
+ int cbyte, tmp, rdlen, mismatch;
+ int max, lablen, labstart, namelen;
+ int eo_max, eo_lablen, eo_labstart, eo_namelen;
+
+ cbyte= *cbyte_io;
+ mismatch= eo_dgram ? 1 : 0;
+
+ namelen= 0; eo_namelen= 0;
+ max= dglen; eo_max= eo_dglen;
+ for (;;) {
+ st= get_label(dgram,dglen,&max,
+ &cbyte,&lablen,&labstart,&namelen);
+ if (st) return st;
+ if (lablen<0) goto x_truncated;
+
+ if (!mismatch) {
+ st= get_label(eo_dgram,eo_dglen,&eo_max,
+ &eo_cbyte,&eo_lablen,&eo_labstart,&eo_namelen);
+ if (st) return st;
+ assert(eo_lablen>=0);
+ if (lablen != eo_lablen) mismatch= 1;
+ while (!mismatch && lablen-- > 0) {
+ ch= dgram[labstart++]; if (ctype_isalpha(ch)) ch &= ~32;
+ eo_ch= eo_dgram[eo_labstart++]; if (ctype_isalpha(eo_ch)) eo_ch &= ~32;
+ if (ch != eo_ch) mismatch= 1
+ }
+ }
+ }
+ if (eo_matched_r) *eo_matched_r= !mismatch;
~mdw / adns / blobdiff