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shared: recognize DNS names with more than one trailing dot as invalid (#4111)

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One trailing dot is valid, but more than one isn't. This also fixes glibc's
posix/tst-getaddrinfo5 test.

Fixes #3978.
This commit is contained in:
Martin Pitt 2016-09-09 17:11:54 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent 0dd99f86ad
commit f35c467db3
2 changed files with 7 additions and 0 deletions
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4
src/shared/dns-domain.c
View File

@ -131,6 +131,10 @@ int dns_label_unescape(const char **name, char *dest, size_t sz) {
if (r == 0 && *n)
return -EINVAL;
/* More than one trailing dot? */
if (*n == '.')
return -EINVAL;
if (sz >= 1 && d)
*d = 0;

3
src/test/test-dns-domain.c
View File

@ -48,6 +48,7 @@ static void test_dns_label_unescape(void) {
test_dns_label_unescape_one("..", "", 20, -EINVAL);
test_dns_label_unescape_one(".foobar", "", 20, -EINVAL);
test_dns_label_unescape_one("foobar.", "foobar", 20, 6);
test_dns_label_unescape_one("foobar..", "foobar", 20, -EINVAL);
}
static void test_dns_name_to_wire_format_one(const char *what, const char *expect, size_t buffer_sz, int ret) {
@ -359,6 +360,7 @@ static void test_dns_name_is_valid_one(const char *s, int ret) {
static void test_dns_name_is_valid(void) {
test_dns_name_is_valid_one("foo", 1);
test_dns_name_is_valid_one("foo.", 1);
test_dns_name_is_valid_one("foo..", 0);
test_dns_name_is_valid_one("Foo", 1);
test_dns_name_is_valid_one("foo.bar", 1);
test_dns_name_is_valid_one("foo.bar.baz", 1);
@ -366,6 +368,7 @@ static void test_dns_name_is_valid(void) {
test_dns_name_is_valid_one("foo..bar", 0);
test_dns_name_is_valid_one(".foo.bar", 0);
test_dns_name_is_valid_one("foo.bar.", 1);
test_dns_name_is_valid_one("foo.bar..", 0);
test_dns_name_is_valid_one("\\zbar", 0);
test_dns_name_is_valid_one("ä", 1);
test_dns_name_is_valid_one("\n", 0);