int n;
if (l && dname[l-1]=='.') l--;
+ if (l && dname[l-1]=='.') return -1;
n = 17+l+!!l;
if (l>253 || buflen<n || op>15u || class>255u || type>255u)
return -1;
/* Construct query template - ID will be filled later */
memset(q, 0, n);
q[2] = op*8 + 1;
+ q[3] = 32; /* AD */
q[5] = 1;
memcpy((char *)q+13, dname, l);
for (i=13; q[i]; i=j+1) {