tests: Add test for socket_wrapper fd-passing support

Signed-off-by: Anoop C S <anoopcs@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>

2 files changed, 193 insertions, 1 deletions

diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 72cda71..fce69e4 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -61,7 +61,7 @@ set(SWRAP_TESTS
     ${SWRAP_THREADED_TESTS})
 
 if (HAVE_STRUCT_MSGHDR_MSG_CONTROL)
-    set(SWRAP_TESTS ${SWRAP_TESTS} test_sendmsg_recvmsg_fd)
+    set(SWRAP_TESTS ${SWRAP_TESTS} test_sendmsg_recvmsg_fd test_echo_tcp_sendmsg_recvmsg_fd)
 endif (HAVE_STRUCT_MSGHDR_MSG_CONTROL)
 
 function(ADD_CMOCKA_TEST_ENVIRONMENT _TEST_NAME)
@@ -116,6 +116,10 @@ foreach(_SWRAP_TEST ${SWRAP_TESTS})
     add_cmocka_test_environment(${_SWRAP_TEST})
 endforeach()
 
+if (HAVE_STRUCT_MSGHDR_MSG_CONTROL)
+    set_tests_properties(test_echo_tcp_sendmsg_recvmsg_fd PROPERTIES WILL_FAIL TRUE)
+endif (HAVE_STRUCT_MSGHDR_MSG_CONTROL)
+
 if (HELGRIND_TESTING)
     find_program(VALGRIND_EXECUTABLE valgrind)
     if (VALGRIND_EXECUTABLE)
diff --git a/tests/test_echo_tcp_sendmsg_recvmsg_fd.c b/tests/test_echo_tcp_sendmsg_recvmsg_fd.c
new file mode 100644
index 0000000..8ae1a60
--- /dev/null
+++ b/tests/test_echo_tcp_sendmsg_recvmsg_fd.c
@@ -0,0 +1,188 @@
+#include <stdarg.h>
+#include <stddef.h>
+#include <setjmp.h>
+#include <cmocka.h>
+
+#include "config.h"
+#include "torture.h"
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+
+static int setup_echo_srv_tcp_ipv4(void **state)
+{
+	torture_setup_echo_srv_tcp_ipv4(state);
+
+	return 0;
+}
+
+static int teardown(void **state)
+{
+	torture_teardown_echo_srv(state);
+
+	return 0;
+}
+
+static void test_tcp_sendmsg_recvmsg_fd(void **state)
+{
+	struct torture_address addr = {
+		.sa_socklen = sizeof(struct sockaddr_in),
+	};
+	int pass_sock_fd;
+	int sv[2];
+	int child_fd, parent_fd;
+	pid_t pid;
+	int rc;
+
+	(void) state; /* unused */
+
+	/* create socket file descriptor to be passed */
+	pass_sock_fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+	assert_int_not_equal(pass_sock_fd, -1);
+
+	addr.sa.in.sin_family = AF_INET;
+	addr.sa.in.sin_port = htons(torture_server_port());
+
+	rc = inet_pton(addr.sa.in.sin_family,
+		       torture_server_address(AF_INET),
+		       &addr.sa.in.sin_addr);
+	assert_int_equal(rc, 1);
+
+	rc = connect(pass_sock_fd, &addr.sa.s, addr.sa_socklen);
+	assert_int_equal(rc, 0);
+
+	/* create unix domain socket stream */
+	rc = socketpair(AF_LOCAL, SOCK_STREAM, 0, sv);
+	assert_int_not_equal(rc, -1);
+
+	parent_fd = sv[0];
+	child_fd = sv[1];
+
+	pid = fork();
+	assert_int_not_equal(pid, -1);
+
+	if (pid == 0) {
+		/* Child */
+		struct torture_address peer_addr = {
+			.sa_socklen = sizeof(struct sockaddr_in),
+		};
+		struct msghdr child_msg;
+		char cmsgbuf[CMSG_SPACE(sizeof(int))];
+		struct cmsghdr *cmsg;
+		int rcv_sock_fd, port;
+		ssize_t ret;
+		char send_buf[64] = {0};
+		char recv_buf[64] = {0};
+		char ipstr[INET_ADDRSTRLEN];
+		char byte = { 0, };
+		struct iovec iov;
+
+		iov.iov_base = &byte;
+		iov.iov_len = 1;
+
+		memset(&child_msg, 0, sizeof(child_msg));
+		child_msg.msg_iov = &iov;
+		child_msg.msg_iovlen = 1;
+		child_msg.msg_control = cmsgbuf;
+		child_msg.msg_controllen = sizeof(cmsgbuf);
+
+		rc = recvmsg(child_fd, &child_msg, 0);
+		assert_int_equal(rc, iov.iov_len);
+		assert_int_equal(byte, '!');
+
+		cmsg = CMSG_FIRSTHDR(&child_msg);
+		assert_non_null(cmsg);
+		assert_int_equal(cmsg->cmsg_type, SCM_RIGHTS);
+
+		memcpy(&rcv_sock_fd, CMSG_DATA(cmsg), sizeof(rcv_sock_fd));
+		assert_int_not_equal(rcv_sock_fd, -1);
+
+		/* extract peer info from received socket fd */
+		ret = getpeername(rcv_sock_fd, &peer_addr.sa.s, &peer_addr.sa_socklen);
+		assert_int_not_equal(ret, -1);
+
+		port = ntohs(peer_addr.sa.in.sin_port);
+		inet_ntop(AF_INET, &peer_addr.sa.in.sin_addr, ipstr, sizeof(ipstr));
+
+		/* check whether it is the same socket previously connected */
+		assert_string_equal(ipstr, torture_server_address(AF_INET));
+		assert_int_equal(port, torture_server_port());
+
+		snprintf(send_buf, sizeof(send_buf), "packet");
+
+		ret = write(rcv_sock_fd,
+			    send_buf,
+			    sizeof(send_buf));
+		assert_int_not_equal(ret, -1);
+
+		ret = read(rcv_sock_fd,
+			   recv_buf,
+			   sizeof(recv_buf));
+		assert_int_not_equal(ret, -1);
+
+		assert_memory_equal(send_buf, recv_buf, sizeof(send_buf));
+
+		exit(0);
+	} else {
+		/* Parent */
+		struct msghdr parent_msg;
+		struct cmsghdr *cmsg;
+		char cmsgbuf[CMSG_SPACE(sizeof(pass_sock_fd))];
+		char byte = '!';
+		struct iovec iov;
+		int cs;
+
+		(void) state; /* unused */
+
+		iov.iov_base = &byte;
+		iov.iov_len = 1;
+
+		memset(&parent_msg, 0, sizeof(parent_msg));
+		parent_msg.msg_iov = &iov;
+		parent_msg.msg_iovlen = 1;
+		parent_msg.msg_control = cmsgbuf;
+		parent_msg.msg_controllen = sizeof(cmsgbuf);
+
+		cmsg = CMSG_FIRSTHDR(&parent_msg);
+		cmsg->cmsg_level = SOL_SOCKET;
+		cmsg->cmsg_type = SCM_RIGHTS;
+		cmsg->cmsg_len = CMSG_LEN(sizeof(pass_sock_fd));
+
+		/* place previously connected socket fd as ancillary data */
+		memcpy(CMSG_DATA(cmsg), &pass_sock_fd, sizeof(pass_sock_fd));
+		parent_msg.msg_controllen = cmsg->cmsg_len;
+
+		rc = sendmsg(parent_fd, &parent_msg, 0);
+		assert_int_not_equal(rc, -1);
+
+		alarm(5);	    /* 5 seconds timeout for the child */
+		waitpid(pid, &cs, 0);
+		if (WIFEXITED(cs)) {
+			assert_int_equal(WEXITSTATUS(cs), 0);
+		}
+	}
+}
+
+int main(void) {
+	int rc;
+
+	const struct CMUnitTest tests[] = {
+		cmocka_unit_test_setup_teardown(test_tcp_sendmsg_recvmsg_fd,
+				 setup_echo_srv_tcp_ipv4,
+				 teardown)
+	};
+
+	rc = cmocka_run_group_tests(tests, NULL, NULL);
+
+	return rc;
+}