Add test which excersises problem with unability to change association of

already associated datagram unix domain socket by issuing connect() system
call.

tools/regression/sockets/reconnect/Makefile

@@ -0,0 +1,9 @@
+#
+# $FreeBSD$
+#
+
+PROG=	reconnect
+NO_MAN=	yes
+WARNS=	2
+
+.include <bsd.prog.mk>

tools/regression/sockets/reconnect/reconnect.c

@@ -0,0 +1,140 @@
+/*-
+ * Copyright (c) 2005 Maxim Sobolev
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * The reconnect regression test is designed to catch kernel bug that may
+ * prevent changing association of already associated datagram unix domain
+ * socket when server side of connection has been closed.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <sys/un.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <string.h>
+#include <unistd.h>
+
+static char *uds_name1 = NULL;
+static char *uds_name2 = NULL;
+
+#define	sstosa(ss)	((struct sockaddr *)(ss))
+
+void
+prepare_ifsun(struct sockaddr_un *ifsun, const char *path)
+{
+
+    memset(ifsun, '\0', sizeof(*ifsun));
+#if !defined(__linux__) && !defined(__solaris__)
+    ifsun->sun_len = strlen(path);
+#endif
+    ifsun->sun_family = AF_LOCAL;
+    strcpy(ifsun->sun_path, path);
+}
+
+int
+create_uds_server(const char *path)
+{
+    struct sockaddr_un ifsun;
+    int sock;
+
+    prepare_ifsun(&ifsun, path);
+
+    unlink(ifsun.sun_path);
+
+    sock = socket(PF_LOCAL, SOCK_DGRAM, 0);
+    if (sock == -1)
+        err(1, "can't create socket");
+    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &sock, sizeof(sock));
+    if (bind(sock, sstosa(&ifsun), sizeof(ifsun)) < 0)
+        err(1, "can't bind to a socket");
+
+    return sock;
+}
+
+void
+connect_uds_server(int sock, const char *path)
+{
+    struct sockaddr_un ifsun;
+    int e;
+
+    prepare_ifsun(&ifsun, path);
+
+    e = connect(sock, sstosa(&ifsun), sizeof(ifsun));
+    if (e < 0)
+        err(1, "can't connect to a socket");
+}
+
+void
+cleanup(void)
+{
+
+    if (uds_name1 != NULL)
+        unlink(uds_name1);
+    if (uds_name2 != NULL)
+        unlink(uds_name2);
+}
+
+int
+main()
+{
+    int s_sock1, s_sock2, c_sock;
+
+    atexit(cleanup);
+
+    uds_name1 = strdup("/tmp/reconnect.XXXXXX");
+    if (uds_name1 == NULL)
+        err(1, "can't allocate memory");
+    uds_name1 = mktemp(uds_name1);
+    if (uds_name1 == NULL)
+        err(1, "mktemp(3) failed");
+    s_sock1 = create_uds_server(uds_name1);
+
+    uds_name2 = strdup("/tmp/reconnect.XXXXXX");
+    if (uds_name2 == NULL)
+        err(1, "can't allocate memory");
+    uds_name2 = mktemp(uds_name2);
+    if (uds_name2 == NULL)
+        err(1, "mktemp(3) failed");
+    s_sock2 = create_uds_server(uds_name2);
+
+    c_sock = socket(PF_LOCAL, SOCK_DGRAM, 0);
+    if (c_sock < 0)
+        err(1, "can't create socket");
+
+    connect_uds_server(c_sock, uds_name1);
+    close(s_sock1);
+    connect_uds_server(c_sock, uds_name2);
+
+    exit (0);
+}