From e3f2c724e2fa703542c667439b66dc7a324a4d6f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Love=20H=C3=B6rnquist=20=C3=85strand?= <lha@kth.se>
Date: Mon, 7 Apr 2008 11:48:35 +0000
Subject: [PATCH] Enable switching between existing caches.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@22842 ec53bebd-3082-4978-b11e-865c3cabbd6b
---
 kuser/kswitch.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 kuser/kswitch.c

diff --git a/kuser/kswitch.c b/kuser/kswitch.c
new file mode 100644
index 000000000..169b2a19c
--- /dev/null
+++ b/kuser/kswitch.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2008 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * 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. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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. 
+ */
+
+#include "kuser_locl.h"
+
+RCSID("$Id$");
+
+/*
+ *
+ */
+
+static int version_flag		= 0;
+static int help_flag		= 0;
+static char *cache;
+static char *principal;
+static char *type;
+
+static struct getargs args[] = {
+    { "type",			't', arg_string, &type,
+      "type of credential cache", "type" },
+    { "cache",			'c', arg_string, &cache,
+      "name of credential cache", "cache" },
+    { "principal",		'p', arg_string, &principal,
+      "name of principal", "principal" },
+    { "version", 		0,   arg_flag, &version_flag, 
+      "print version", NULL },
+    { "help",			0,   arg_flag, &help_flag, NULL, NULL}
+};
+
+static void
+usage (int ret)
+{
+    arg_printusage (args, sizeof(args)/sizeof(*args), NULL, "");
+    exit (ret);
+}
+
+int
+main (int argc, char **argv)
+{
+    const krb5_cc_ops *ops;
+    krb5_context context;
+    krb5_error_code ret;
+    krb5_ccache id;
+    int optidx = 0;
+    char *str;
+
+    setprogname (argv[0]);
+
+    ret = krb5_init_context (&context);
+    if (ret == KRB5_CONFIG_BADFORMAT)
+	errx (1, "krb5_init_context failed to parse configuration file");
+    else if (ret)
+	errx(1, "krb5_init_context failed: %d", ret);
+
+    if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
+	usage(1);
+    
+    if (help_flag)
+	usage (0);
+
+    if(version_flag){
+	print_version(NULL);
+	exit(0);
+    }
+
+    argc -= optidx;
+    argv += optidx;
+
+    if (argc != 0)
+	usage (1);
+
+    if (cache == NULL)
+	krb5_errx(context, 1, "No cache name given");
+
+    ops = krb5_cc_get_prefix_ops(context, type);
+    if (ops == NULL)
+	krb5_err (context, 1, 0, "krb5_cc_get_prefix_ops");
+
+    asprintf(&str, "%s:%s", ops->prefix, cache);
+    if (str == NULL)
+	krb5_errx(context, 1, "out of memory");
+
+    ret = krb5_cc_resolve(context, str, &id);
+    if (ret)
+	krb5_err (context, 1, ret, "krb5_cc_resolve: %s", str);
+
+    free(str);
+
+    ret = krb5_cc_switch(context, id);
+    if (ret)
+	krb5_err (context, 1, ret, "krb5_cc_switch");
+
+    krb5_cc_close(context, id);
+
+    return 0;
+}