tests: fix unix domain socket decoding availability test
Since inet_diag and unix_diag interfaces are implemented by different
kernel modules, they have to be tested separately.
* tests/netlink_unix_diag.c: New file.
* tests/unix-yy.test: Use it.
* tests/Makefile.am (check_PROGRAMS): Add it.
* tests/.gitignore: Likewise.
diff --git a/tests/netlink_unix_diag.c b/tests/netlink_unix_diag.c
new file mode 100644
index 0000000..7208117
--- /dev/null
+++ b/tests/netlink_unix_diag.c
@@ -0,0 +1,98 @@
+#include <assert.h>
+#include <stddef.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <linux/netlink.h>
+#include <linux/sock_diag.h>
+#include <linux/unix_diag.h>
+
+static int
+send_query(const int fd, const int family, const int proto)
+{
+ struct sockaddr_nl nladdr = {
+ .nl_family = AF_NETLINK
+ };
+ struct {
+ struct nlmsghdr nlh;
+ struct unix_diag_req udr;
+ } req = {
+ .nlh = {
+ .nlmsg_len = sizeof(req),
+ .nlmsg_type = SOCK_DIAG_BY_FAMILY,
+ .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
+ },
+ .udr = {
+ .sdiag_family = family,
+ .sdiag_protocol = proto,
+ .udiag_states = -1,
+ .udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER
+ }
+ };
+ struct iovec iov = {
+ .iov_base = &req,
+ .iov_len = sizeof(req)
+ };
+ struct msghdr msg = {
+ .msg_name = (void*)&nladdr,
+ .msg_namelen = sizeof(nladdr),
+ .msg_iov = &iov,
+ .msg_iovlen = 1
+ };
+
+ return sendmsg(fd, &msg, 0) > 0;
+}
+
+static int
+check_responses(const int fd)
+{
+ static char buf[8192];
+ struct sockaddr_nl nladdr = {
+ .nl_family = AF_NETLINK
+ };
+ struct iovec iov = {
+ .iov_base = buf,
+ .iov_len = sizeof(buf)
+ };
+ struct msghdr msg = {
+ .msg_name = (void*)&nladdr,
+ .msg_namelen = sizeof(nladdr),
+ .msg_iov = &iov,
+ .msg_iovlen = 1
+ };
+
+ ssize_t ret = recvmsg(fd, &msg, 0);
+ if (ret <= 0)
+ return 0;
+
+ struct nlmsghdr *h = (struct nlmsghdr*)buf;
+ return (NLMSG_OK(h, ret) &&
+ h->nlmsg_type != NLMSG_ERROR &&
+ h->nlmsg_type != NLMSG_DONE) ? 1 : 0;
+}
+
+#define SUN_PATH "netlink_unix_diag_socket"
+int main(void)
+{
+ struct sockaddr_un addr = {
+ .sun_family = AF_UNIX,
+ .sun_path = SUN_PATH
+ };
+ socklen_t len = offsetof(struct sockaddr_un, sun_path) + sizeof(SUN_PATH);
+
+ close(0);
+ close(1);
+
+ (void) unlink(SUN_PATH);
+ assert(socket(PF_LOCAL, SOCK_STREAM, 0) == 0);
+ assert(bind(0, (struct sockaddr *) &addr, len) == 0);
+ assert(listen(0, 5) == 0);
+ assert(unlink(SUN_PATH) == 0);
+
+ if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG) != 1)
+ return 77;
+
+ return (send_query(1, AF_UNIX, 0) &&
+ check_responses(1)) ? 0 : 77;
+}