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shared: dns-name - add dns_name_between()

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Given three DNS names this function indicates if the second argument lies
strictly between the first and the third according to the canonical DNS
name order. Note that the order is circular, so the last name is
considered to be before the first.
This commit is contained in:
Tom Gundersen
2015-07-28 00:07:32 +02:00
parent 5dfd7011ba
commit ae72b22c40
3 changed files with 56 additions and 0 deletions
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src/test/test-dns-domain.c
+33
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@@ -160,6 +160,38 @@ static void test_dns_name_equal(void) {
test_dns_name_equal_one("..", "..", -EINVAL);
}
static void test_dns_name_between_one(const char *a, const char *b, const char *c, int ret) {
int r;
r = dns_name_between(a, b, c);
assert_se(r == ret);
r = dns_name_between(c, b, a);
if (ret >= 0)
assert_se(r == 0);
else
assert_se(r == ret);
}
static void test_dns_name_between(void) {
/* see https://tools.ietf.org/html/rfc4034#section-6.1
Note that we use "\033.z.example" in stead of "\001.z.example" as we
consider the latter invalid */
test_dns_name_between_one("example", "a.example", "yljkjljk.a.example", true);
test_dns_name_between_one("a.example", "yljkjljk.a.example", "Z.a.example", true);
test_dns_name_between_one("yljkjljk.a.example", "Z.a.example", "zABC.a.EXAMPLE", true);
test_dns_name_between_one("Z.a.example", "zABC.a.EXAMPLE", "z.example", true);
test_dns_name_between_one("zABC.a.EXAMPLE", "z.example", "\\033.z.example", true);
test_dns_name_between_one("z.example", "\\033.z.example", "*.z.example", true);
test_dns_name_between_one("\\033.z.example", "*.z.example", "\\200.z.example", true);
test_dns_name_between_one("*.z.example", "\\200.z.example", "example", true);
test_dns_name_between_one("\\200.z.example", "example", "a.example", true);
test_dns_name_between_one("example", "a.example", "example", -EINVAL);
test_dns_name_between_one("example", "example", "yljkjljk.a.example", false);
test_dns_name_between_one("example", "yljkjljk.a.example", "yljkjljk.a.example", false);
}
static void test_dns_name_endswith_one(const char *a, const char *b, int ret) {
assert_se(dns_name_endswith(a, b) == ret);
}
@@ -225,6 +257,7 @@ int main(int argc, char *argv[]) {
test_dns_name_normalize();
test_dns_name_equal();
test_dns_name_endswith();
test_dns_name_between();
test_dns_name_root();
test_dns_name_single_label();
test_dns_name_reverse();