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authorMarcel Holtmann <marcel@holtmann.org>2009-08-11 00:07:32 -0700
committerMarcel Holtmann <marcel@holtmann.org>2009-08-11 00:07:32 -0700
commit00244ccfa4ee00b587de105acb02e42c8f90ad7a (patch)
treeb7d8263a53d157c9b23e6190cb2396295a81ef08
parentceaf6773305dd4fc511e8b111fa2c4b1fc97b218 (diff)
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Add test program for netmask and prefixlen conversion
-rw-r--r--tools/Makefile.am2
-rw-r--r--tools/addr-test.c66
2 files changed, 67 insertions, 1 deletions
diff --git a/tools/Makefile.am b/tools/Makefile.am
index 407811c4..bafb4762 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -1,6 +1,6 @@
if TOOLS
-noinst_PROGRAMS = wifi-scan tap-test
+noinst_PROGRAMS = wifi-scan tap-test addr-test
wifi_scan_LDADD = @GLIB_LIBS@ @NETLINK_LIBS@
endif
diff --git a/tools/addr-test.c b/tools/addr-test.c
new file mode 100644
index 00000000..44364204
--- /dev/null
+++ b/tools/addr-test.c
@@ -0,0 +1,66 @@
+/*
+ *
+ * Connection Manager
+ *
+ * Copyright (C) 2007-2009 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <arpa/inet.h>
+
+static unsigned char netmask2prefixlen(const char *netmask)
+{
+ unsigned char bits = 0;
+ in_addr_t mask = inet_network(netmask);
+ in_addr_t host = ~mask;
+
+ /* a valid netmask must be 2^n - 1 */
+ if ((host & (host + 1)) != 0)
+ return -1;
+
+ for (; mask; mask <<= 1)
+ ++bits;
+
+ return bits;
+}
+
+int main(int argc, char *argv[])
+{
+ const char *masks[] = { "255.255.255.255", "255.255.255.0",
+ "255.255.0.0", "255.0.0.0" };
+ struct in_addr addr;
+ int i, len;
+
+ for (i = 0; i < 4; i++) {
+ printf("subnet %-16s prefixlen %u\n", masks[i],
+ netmask2prefixlen(masks[i]));
+ }
+
+ printf("\n");
+
+ for (i = 0; i < 4; i++) {
+ len = (i + 1) * 8;
+ addr.s_addr = htonl(~(0xfffffffflu >> len));
+ printf("prefixlen %-2u netmask %s\n", len, inet_ntoa(addr));
+ }
+
+ return 0;
+}