Add a simple IPX datagram regression test, which opens two IPX datagram

sockets, binds a local port, sends a datagram, and confirms that it is
received.

tools/regression/netipx/ipxdgramloopback/Makefile

@@ -0,0 +1,12 @@
+#
+# $FreeBSD$
+#
+
+PROG=	ipxdgramloopback
+NO_MAN=
+
+DPADD=	${LIBIPX};
+LDADD=	-lipx
+WARNS=	3
+
+.include <bsd.prog.mk>

tools/regression/netipx/ipxdgramloopback/ipxdgramloopback.c

@@ -0,0 +1,118 @@
+/*-
+ * Copyright (c) 2006 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.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * Simple netipx regression test that attempts to build an IPX datagram
+ * socket pair and send a packet from one to the other.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <netipx/ipx.h>
+
+#include <err.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+
+#define	IPX_ENDPOINT	"0xbebe.1.0x8a13"
+#define	PACKETLEN	128
+
+int
+main(int argc, char *argv[])
+{
+	struct sockaddr_ipx sipx_recv, sipx_send;
+	u_char packet[PACKETLEN];
+	int i, sock_recv, sock_send;
+	ssize_t len;
+
+	/*
+	 * Socket to receive with.
+	 */
+	sock_recv = socket(PF_IPX, SOCK_DGRAM, 0);
+	if (sock_recv < 0)
+		err(-1, "sock_recv = socket(PF_IPX, SOCK_DGRAM, 0)");
+
+	bzero(&sipx_recv, sizeof(sipx_recv));
+	sipx_recv.sipx_len = sizeof(sipx_recv);
+	sipx_recv.sipx_family = AF_IPX;
+	sipx_recv.sipx_addr = ipx_addr(IPX_ENDPOINT);
+
+	if (bind(sock_recv, (struct sockaddr *)&sipx_recv, sizeof(sipx_recv))
+	    < 0)
+		err(-1, "bind(sock_recv)");
+
+	/*
+	 * Set non-blocking to try to avoid blocking indefinitely if the
+	 * packet doesn't end up in the right place.
+	 */
+	if (fcntl(sock_recv, F_SETFL, O_NONBLOCK) < 0)
+		err(-1, "fcntl(O_NONBLOCK, sock_recv)");
+
+	/*
+	 * Socket to send with.
+	 */
+	sock_send = socket(PF_IPX, SOCK_DGRAM, 0);
+	if (sock_send < 0)
+		err(-1, "sock_send = socket(PF_IPX, SOCK_DGRAM, 0)");
+
+	bzero(&sipx_send, sizeof(sipx_send));
+	sipx_send.sipx_len = sizeof(sipx_send);
+	sipx_send.sipx_family = AF_IPX;
+	sipx_send.sipx_addr = ipx_addr(IPX_ENDPOINT);
+
+	for (i = 0; i < PACKETLEN; i++)
+		packet[i] = (i & 0xff);
+
+	len = sendto(sock_send, packet, sizeof(packet), 0,
+	    (struct sockaddr *)&sipx_send, sizeof(sipx_send));
+	if (len < 0)
+		err(-1, "sendto()");
+	if (len != sizeof(packet))
+		errx(-1, "sendto(): short send (%d length, %d sent)",
+		    sizeof(packet), len);
+
+	sleep(1);	/* Arbitrary non-zero amount. */
+
+	bzero(packet, sizeof(packet));
+	len = recv(sock_recv, packet, sizeof(packet), 0);
+	if (len < 0)
+		err(-1, "recv()");
+	if (len != sizeof(packet))
+		errx(-1, "recv(): short receive (%d length, %d received)",
+		    sizeof(packet), len);
+
+	for (i = 0; i < PACKETLEN; i++) {
+		if (packet[i] != (i & 0xff))
+			errx(-1, "recv(): byte %d wrong (%d instead of %d)",
+			    i, packet[i], i & 0xff);
+	}
+
+	return (0);
+}