Add udpconnectjail, a simple regression test to exercise an (as yet)

unfixed bug in the jail() implementation relating to using the connect()
system call on UDP sockets.

PR:	26506

tools/regression/netinet/udpconnectjail/Makefile

@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+PROG=	udpconnectjail
+NO_MAN=	yes
+WARNS=	3
+
+.include <bsd.prog.mk>

tools/regression/netinet/udpconnectjail/udpconnectjail.c

@@ -0,0 +1,110 @@
+/*-
+ * Copyright (c) 2005 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/jail.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+
+#include <arpa/inet.h>
+
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/*
+ * A bug in the jail(8) code prevented processes in jail from properly
+ * connecting UDP sockets.  This test program attempts to exercise that bug.
+ */
+
+static void
+usage(void)
+{
+
+	fprintf(stderr, "udpconnectjail: no arguments\n");
+	exit(-1);
+}
+
+static void
+test(const char *context, struct sockaddr_in *sin)
+{
+	int sock;
+
+	sock = socket(PF_INET, SOCK_DGRAM, 0);
+	if (sock == -1)
+		errx(-1, "%s: socket(PF_INET, SOCK_DGRAM, 0): %s", context,
+		    strerror(errno));
+
+	if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
+		errx(-1, "%s: connect(%s): %s", context,
+		    inet_ntoa(sin->sin_addr), strerror(errno));
+
+	if (close(sock) < 0)
+		errx(-1, "%s: close(): %s", context, strerror(errno));
+}
+
+int
+main(int argc, __unused char *argv[])
+{
+	struct sockaddr_in sin;
+	struct jail thejail;
+
+	if (argc != 1)
+		usage();
+
+	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 = 0;
+
+	/*
+	 * First run the system call test outside of a jail.
+	 */
+	test("not in jail", &sin);
+
+	/*
+	 * Now re-run in a jail.
+	 */
+	bzero(&thejail, sizeof(thejail));
+	thejail.version = 0;
+	thejail.path = "/";
+	thejail.hostname = "jail";
+	thejail.ip_number = htonl(INADDR_LOOPBACK);
+	if (jail(&thejail) < 0)
+		errx(-1, "jail: %s", strerror(errno));
+	test("in jail", &sin);
+
+	fprintf(stdout, "PASS\n");
+
+	return (0);
+}