Regression test for the loopback handling of zero-length UDP packets, which

should be delivered but without payload.

2 files changed, 111 insertions, 0 deletions

diff --git a/tools/regression/netinet/udpzerobyte/Makefile b/tools/regression/netinet/udpzerobyte/Makefile
new file mode 100644
index 0000000..818c172
--- /dev/null
+++ b/tools/regression/netinet/udpzerobyte/Makefile
@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+PROG=	udpzerobyte
+NO_MAN=
+WARNS?=	2
+
+.include <bsd.prog.mk>
diff --git a/tools/regression/netinet/udpzerobyte/udpzerobyte.c b/tools/regression/netinet/udpzerobyte/udpzerobyte.c
new file mode 100644
index 0000000..986d24c
--- /dev/null
+++ b/tools/regression/netinet/udpzerobyte/udpzerobyte.c
@@ -0,0 +1,104 @@
+/*-
+ * Copyright (c) 2008 Robert N. M. Watson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+
+#include <arpa/inet.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+/*
+ * The UDP code allows transmitting zero-byte datagrams, but are they
+ * received?
+ */
+
+#define	THEPORT	9543		/* Arbitrary. */
+
+static void
+usage(void)
+{
+
+	errx(-1, "no arguments allowed\n");
+}
+
+int
+main(int argc, __unused char *argv[])
+{
+	struct sockaddr_in sin;
+
+	int sock_send, sock_receive;
+
+	if (argc != 1)
+		usage();
+
+	sock_send = socket(PF_INET, SOCK_DGRAM, 0);
+	if (sock_send < 0)
+		err(-1, "socket(PF_INET, SOCK_DGRAM, 0)");
+
+	sock_receive = socket(PF_INET, SOCK_DGRAM, 0);
+	if (sock_receive < 0)
+		err(-1, "socket(PF_INET, SOCK_DGRAM, 0)");
+
+	bzero(&sin, sizeof(sin));
+	sin.sin_len = sizeof(sin);
+	sin.sin_family = AF_INET;
+	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+	sin.sin_port = htons(THEPORT);
+	if (bind(sock_receive, (struct sockaddr *)&sin, sizeof(sin)) < 0)
+		err(-1, "bind(sock_receive, %s:%d)", inet_ntoa(sin.sin_addr),
+		    ntohs(sin.sin_port));
+	if (fcntl(sock_receive, F_SETFL, O_NONBLOCK, 1) < 0)
+		err(-1, "fcntl(sock_receive, FL_SETFL, O_NONBLOCK)");
+
+	if (connect(sock_send, (struct sockaddr *)&sin, sizeof(sin)) < 0)
+		err(-1, "connect(sock_send, %s:%d)", inet_ntoa(sin.sin_addr),
+		    htons(sin.sin_port));
+
+	if (recv(sock_receive, NULL, 0, 0) >= 0 || errno != EAGAIN)
+		err(-1, "recv(sock_receive, NULL, 0) before");
+
+	if (send(sock_send, NULL, 0, 0) < 0)
+		err(-1, "send(sock_send, NULL, 0)");
+
+	(void)sleep(1);
+	if (recv(sock_receive, NULL, 0, 0) < 0)
+		err(-1, "recv(sock_receive, NULL, 0) test");
+
+	if (recv(sock_receive, NULL, 0, 0) >= 0 || errno != EAGAIN)
+		err(-1, "recv(sock_receive, NULL, 0) after");
+
+	return (0);
+}