int dname_equal_nocase(uint8_t* a, uint8_t* b, uint16_t len)
{
uint8_t i, lablen;
while(len > 0) {
/* check labellen */
if(*a != *b)
return 0;
lablen = *a++;
b++;
len--;
/* malformed or compression ptr; we stop scanning */
if((lablen & 0xc0) || len < lablen)
return (memcmp(a, b, len) == 0);
/* check the label, lowercased */
for(i=0; i<lablen; i++) {
if(DNAME_NORMALIZE(*a++) != DNAME_NORMALIZE(*b++))
return 0;
}
len -= lablen;
}
return 1;
}
const dname_type *
dname_make(region_type *region, const uint8_t *name, int normalize)
{
size_t name_size = 0;
uint8_t label_offsets[MAXDOMAINLEN];
uint8_t label_count = 0;
const uint8_t *label = name;
dname_type *result;
ssize_t i;
assert(name);
while (1) {
if (label_is_pointer(label))
return NULL;
label_offsets[label_count] = (uint8_t) (label - name);
++label_count;
name_size += label_length(label) + 1;
if (label_is_root(label))
break;
label = label_next(label);
}
if (name_size > MAXDOMAINLEN)
return NULL;
assert(label_count <= MAXDOMAINLEN / 2 + 1);
/* Reverse label offsets. */
for (i = 0; i < label_count / 2; ++i) {
uint8_t tmp = label_offsets[i];
label_offsets[i] = label_offsets[label_count - i - 1];
label_offsets[label_count - i - 1] = tmp;
}
result = (dname_type *) region_alloc(
region,
(sizeof(dname_type)
+ (label_count + name_size) * sizeof(uint8_t)));
result->name_size = name_size;
result->label_count = label_count;
memcpy((uint8_t *) dname_label_offsets(result),
label_offsets,
label_count * sizeof(uint8_t));
if (normalize) {
uint8_t *dst = (uint8_t *) dname_name(result);
const uint8_t *src = name;
while (!label_is_root(src)) {
ssize_t len = label_length(src);
*dst++ = *src++;
for (i = 0; i < len; ++i) {
*dst++ = DNAME_NORMALIZE(*src++);
}
}
*dst = *src;
} else {
memcpy((uint8_t *) dname_name(result),
name,
name_size * sizeof(uint8_t));
}
return result;
}
