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resolved: implement client-side DNAME resolution

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Most servers apparently always implicitly convert DNAME to CNAME, but
some servers don't, hence implement this properly, as this is required
by edns0.
This commit is contained in:
Lennart Poettering
2015-11-24 00:20:39 +01:00
parent 5ce1946f4d
commit 58db254ade
7 changed files with 175 additions and 12 deletions
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src/test/test-dns-domain.c
+20
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@@ -408,6 +408,25 @@ static void test_dns_service_split(void) {
test_dns_service_split_one("Wuff\\032Wuff._foo._bar.waldo.com", "Wuff Wuff", "_foo._bar", "waldo.com", 0);
}
static void test_dns_name_change_suffix_one(const char *name, const char *old_suffix, const char *new_suffix, int r, const char *result) {
_cleanup_free_ char *s = NULL;
assert_se(dns_name_change_suffix(name, old_suffix, new_suffix, &s) == r);
assert_se(streq_ptr(s, result));
}
static void test_dns_name_change_suffix(void) {
test_dns_name_change_suffix_one("foo.bar", "bar", "waldo", 1, "foo.waldo");
test_dns_name_change_suffix_one("foo.bar.waldi.quux", "foo.bar.waldi.quux", "piff.paff", 1, "piff.paff");
test_dns_name_change_suffix_one("foo.bar.waldi.quux", "bar.waldi.quux", "piff.paff", 1, "foo.piff.paff");
test_dns_name_change_suffix_one("foo.bar.waldi.quux", "waldi.quux", "piff.paff", 1, "foo.bar.piff.paff");
test_dns_name_change_suffix_one("foo.bar.waldi.quux", "quux", "piff.paff", 1, "foo.bar.waldi.piff.paff");
test_dns_name_change_suffix_one("foo.bar.waldi.quux", "", "piff.paff", 1, "foo.bar.waldi.quux.piff.paff");
test_dns_name_change_suffix_one("", "", "piff.paff", 1, "piff.paff");
test_dns_name_change_suffix_one("", "", "", 1, "");
test_dns_name_change_suffix_one("a", "b", "c", 0, NULL);
}
int main(int argc, char *argv[]) {
test_dns_label_unescape();
@@ -427,6 +446,7 @@ int main(int argc, char *argv[]) {
test_dns_srv_type_verify();
test_dns_service_join();
test_dns_service_split();
test_dns_name_change_suffix();
return 0;
}