tests: add new test test_bind_ipv4_addr_in_use()

This tests binding an address that is already in use.

Signed-off-by: Michael Adam <obnox@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>

1 files changed, 157 insertions, 0 deletions

diff --git a/tests/test_echo_tcp_bind.c b/tests/test_echo_tcp_bind.c
index 51528c2..c699b06 100644
--- a/tests/test_echo_tcp_bind.c
+++ b/tests/test_echo_tcp_bind.c
@@ -154,6 +154,160 @@ static void test_bind_ipv4(void **state)
 	close(s);
 }
 
+static void test_bind_ipv4_addr_in_use(void **state)
+{
+	struct sockaddr_in sin, sin2;
+	socklen_t slen = sizeof(struct sockaddr_in);
+	int rc;
+	int s, s2;
+
+	(void) state; /* unused */
+
+	s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+	assert_return_code(s, errno);
+
+	/*
+	 * Try to bind to the same address as already bound by a
+	 * different process.
+	 */
+
+	/* Without specifying the port - success */
+
+	ZERO_STRUCT(sin);
+	sin.sin_family = AF_INET;
+	rc = inet_pton(AF_INET, torture_server_address(AF_INET), &sin.sin_addr);
+	assert_int_equal(rc, 1);
+	rc = bind(s, (struct sockaddr *)&sin, slen);
+	assert_return_code(rc, errno);
+
+	close(s);
+
+	s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+	assert_return_code(s, errno);
+
+#if 0
+	/* specify the same port - fail with EADDRINUSE. */
+
+	/* Not supported by socket_wrapper yet. ==> TODO! */
+
+	ZERO_STRUCT(sin);
+	sin.sin_family = AF_INET,
+	sin.sin_port = htons(torture_server_port());
+	rc = inet_pton(AF_INET, torture_server_address(AF_INET), &sin.sin_addr);
+	assert_int_equal(rc, 1);
+
+	rc = bind(s, (struct sockaddr *)&sin, slen);
+	assert_int_equal(rc, -1);
+	assert_int_equal(errno, EADDRINUSE);
+#endif
+
+	/*
+	 * Try double binding when the firs bind is with port == 0
+	 */
+
+	ZERO_STRUCT(sin);
+	sin.sin_family = AF_INET;
+
+	rc = inet_pton(AF_INET, "127.0.0.20", &sin.sin_addr);
+	assert_int_equal(rc, 1);
+
+	rc = bind(s, (struct sockaddr *)&sin, slen);
+	assert_return_code(rc, errno);
+
+	/*
+	 * Open a second socket locally and try to bind to the same address.
+	 */
+
+	 /* Succeeds with port == 0 */
+
+	s2 = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+	assert_return_code(s, errno);
+
+	ZERO_STRUCT(sin2);
+	sin2.sin_family = AF_INET;
+
+	rc = inet_pton(AF_INET, "127.0.0.20", &sin2.sin_addr);
+	assert_int_equal(rc, 1);
+
+	rc = bind(s2, (struct sockaddr *)&sin2, slen);
+	assert_return_code(rc, errno);
+
+	close(s2);
+
+	/* second bind with port != 0  - succeeds */
+
+	s2 = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+	assert_return_code(s, errno);
+
+	ZERO_STRUCT(sin2);
+	sin2.sin_family = AF_INET;
+	sin2.sin_port = htons(12345);
+
+	rc = inet_pton(AF_INET, "127.0.0.20", &sin2.sin_addr);
+	assert_int_equal(rc, 1);
+
+	rc = bind(s2, (struct sockaddr *)&sin2, slen);
+	assert_return_code(rc, errno);
+
+	close(s2);
+	close(s);
+
+	/*
+	 * Try double binding when the first bind is with port != 0
+	 */
+
+	s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+	assert_return_code(s, errno);
+
+	ZERO_STRUCT(sin);
+	sin.sin_family = AF_INET;
+	sin.sin_port = htons(12345);
+
+	rc = inet_pton(AF_INET, "127.0.0.20", &sin.sin_addr);
+	assert_int_equal(rc, 1);
+
+	rc = bind(s, (struct sockaddr *)&sin, slen);
+	assert_return_code(rc, errno);
+
+	/*
+	 * Open a second socket locally and try to bind to the same address.
+	 */
+
+	 /* Succeeds with port == 0 */
+
+	s2 = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+	assert_return_code(s, errno);
+
+	ZERO_STRUCT(sin2);
+	sin2.sin_family = AF_INET;
+
+	rc = inet_pton(AF_INET, "127.0.0.20", &sin2.sin_addr);
+	assert_int_equal(rc, 1);
+
+	rc = bind(s2, (struct sockaddr *)&sin2, slen);
+	assert_return_code(rc, errno);
+
+	close(s2);
+
+	/* with same port as above - fail with EADDRINUSE */
+
+	s2 = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+	assert_return_code(s, errno);
+
+	ZERO_STRUCT(sin2);
+	sin2.sin_family = AF_INET;
+	sin2.sin_port = htons(12345);
+
+	rc = inet_pton(AF_INET, "127.0.0.20", &sin2.sin_addr);
+	assert_int_equal(rc, 1);
+
+	rc = bind(s2, (struct sockaddr *)&sin2, slen);
+	assert_int_equal(rc, -1);
+	assert_int_equal(errno, EADDRINUSE);
+
+	close(s);
+}
+
 static void test_bindresvport_ipv4(void **state)
 {
 	struct sockaddr_in sin;
@@ -312,6 +466,9 @@ int main(void) {
 		unit_test_setup_teardown(test_bind_ipv4,
 					 setup_echo_srv_tcp_ipv4,
 					 teardown),
+		unit_test_setup_teardown(test_bind_ipv4_addr_in_use,
+					 setup_echo_srv_tcp_ipv4,
+					 teardown),
 		unit_test_setup_teardown(test_bindresvport_ipv4,
 					 setup_echo_srv_tcp_ipv4,
 					 teardown),