static adns_status mkquery_header(adns_state ads, vbuf * vb, int *id_r,
int qdlen)
{
int id;
byte *rqp;
if (!adns__vbuf_ensure(vb, DNS_HDRSIZE + qdlen + 4))
return adns_s_nomemory;
vb->used = 0;
MKQUERY_START(vb);
*id_r = id = (ads->nextid++) & 0x0ffff;
MKQUERY_ADDW(id);
MKQUERY_ADDB(0x01); /* QR=Q(0), OPCODE=QUERY(0000), !AA, !TC, RD */
MKQUERY_ADDB(0x00); /* !RA, Z=000, RCODE=NOERROR(0000) */
MKQUERY_ADDW(1); /* QDCOUNT=1 */
MKQUERY_ADDW(0); /* ANCOUNT=0 */
MKQUERY_ADDW(0); /* NSCOUNT=0 */
MKQUERY_ADDW(0); /* ARCOUNT=0 */
MKQUERY_STOP(vb);
return adns_s_ok;
}
adns_status adns__mkquery_frdgram(adns_state ads, vbuf *vb, int *id_r,
const byte *qd_dgram, int qd_dglen, int qd_begin,
adns_rrtype type, adns_queryflags flags) {
byte *rqp;
findlabel_state fls;
int lablen, labstart;
adns_status st;
st= mkquery_header(ads,vb,id_r,qd_dglen); if (st) return st;
MKQUERY_START(vb);
adns__findlabel_start(&fls,ads,-1,0,qd_dgram,qd_dglen,qd_dglen,qd_begin,0);
for (;;) {
st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
if (!lablen) break;
assert(lablen<255);
MKQUERY_ADDB(lablen);
memcpy(rqp,qd_dgram+labstart,lablen);
rqp+= lablen;
}
MKQUERY_ADDB(0);
MKQUERY_STOP(vb);
st= mkquery_footer(vb,type);
return adns_s_ok;
}
adns_status adns__mkquery(adns_state ads, vbuf *vb, int *id_r,
const char *owner, int ol,
const typeinfo *typei, adns_queryflags flags) {
int ll, c, nbytes;
byte label[255], *rqp;
const char *p, *pe;
adns_status st;
st= mkquery_header(ads,vb,id_r,ol+2); if (st) return st;
MKQUERY_START(vb);
p= owner; pe= owner+ol;
nbytes= 0;
while (p!=pe) {
ll= 0;
while (p!=pe && (c= *p++)!='.') {
if (c=='\\') {
if (!(flags & adns_qf_quoteok_query)) return adns_s_querydomaininvalid;
if (ctype_digit(p[0])) {
if (ctype_digit(p[1]) && ctype_digit(p[2])) {
c = (*p++ - '0')*100;
c += (*p++ - '0')*10;
c += (*p++ - '0');
if (c >= 256) return adns_s_querydomaininvalid;
} else {
return adns_s_querydomaininvalid;
}
} else if (!(c= *p++)) {
return adns_s_querydomaininvalid;
}
}
if (!(flags & adns_qf_quoteok_query)) {
if (c == '-') {
if (!ll) return adns_s_querydomaininvalid;
} else if (!ctype_alpha(c) && !ctype_digit(c)) {
return adns_s_querydomaininvalid;
}
}
if (ll == sizeof(label)) return adns_s_querydomaininvalid;
label[ll++]= c;
}
if (!ll) return adns_s_querydomaininvalid;
if (ll > DNS_MAXLABEL) return adns_s_querydomaintoolong;
nbytes+= ll+1;
if (nbytes >= DNS_MAXDOMAIN) return adns_s_querydomaintoolong;
MKQUERY_ADDB(ll);
memcpy(rqp,label,ll); rqp+= ll;
}
MKQUERY_ADDB(0);
MKQUERY_STOP(vb);
st= mkquery_footer(vb,typei->type);
return adns_s_ok;
}
static adns_status mkquery_footer(vbuf *vb, adns_rrtype type) {
byte *rqp;
MKQUERY_START(vb);
MKQUERY_ADDW(type & adns__rrt_typemask); /* QTYPE */
MKQUERY_ADDW(DNS_CLASS_IN); /* QCLASS=IN */
MKQUERY_STOP(vb);
assert(vb->used <= vb->avail);
return adns_s_ok;
}