int dns_name_normalize(const char *s, char **_ret) {
_cleanup_free_ char *ret = NULL;
size_t n = 0, allocated = 0;
const char *p = s;
bool first = true;
int r;
assert(s);
for (;;) {
_cleanup_free_ char *t = NULL;
char label[DNS_LABEL_MAX];
int k;
r = dns_label_unescape(&p, label, sizeof(label));
if (r < 0)
return r;
if (r == 0) {
if (*p != 0)
return -EINVAL;
break;
}
k = dns_label_undo_idna(label, r, label, sizeof(label));
if (k < 0)
return k;
if (k > 0)
r = k;
r = dns_label_escape(label, r, &t);
if (r < 0)
return r;
if (!GREEDY_REALLOC(ret, allocated, n + !first + strlen(t) + 1))
return -ENOMEM;
if (!first)
ret[n++] = '.';
else
first = false;
memcpy(ret + n, t, r);
n += r;
}
if (n > DNS_NAME_MAX)
return -EINVAL;
if (!GREEDY_REALLOC(ret, allocated, n + 1))
return -ENOMEM;
ret[n] = 0;
if (_ret) {
*_ret = ret;
ret = NULL;
}
return 0;
}
static void test_dns_label_escape_one(const char *what, size_t l, const char *expect, int ret) {
_cleanup_free_ char *t = NULL;
int r;
r = dns_label_escape(what, l, &t);
assert_se(r == ret);
if (r < 0)
return;
assert_se(streq_ptr(expect, t));
}