network/tunconfig: Initial work on a tool to manage tunnels

* Modeled after pppconfig to some degree.
* Normally various VPN and other services will create / manage
  tunnels directly, however this gives us a good way to
  test / play with things initially.

src/bin/network/Jamfile

@@ -18,4 +18,4 @@ SubInclude HAIKU_TOP src bin network route ;
 SubInclude HAIKU_TOP src bin network telnet ;
 SubInclude HAIKU_TOP src bin network telnetd ;
 SubInclude HAIKU_TOP src bin network traceroute ;
-
+SubInclude HAIKU_TOP src bin network tunconfig ;

src/bin/network/tunconfig/Jamfile

@@ -0,0 +1,19 @@
+SubDir HAIKU_TOP src bin network tunconfig ;
+
+UsePrivateKernelHeaders ;
+UsePrivateHeaders net ;
+UseHeaders [ FDirName $(HAIKU_TOP) src add-ons kernel network ppp shared libppp
+	headers ] : true ;
+UseHeaders [ FDirName $(HAIKU_TOP) src add-ons kernel network ppp shared
+	libkernelppp headers ] : true ;
+
+BinCommand tunconfig :
+	tunconfig.cpp
+	:
+	be libppp.a [ TargetLibsupc++ ] libbsd.so $(TARGET_NETWORK_LIBS)
+;
+
+# Installation
+HaikuInstall install-tun
+	: /boot/home/config/non-packaged/bin
+	: tunconfig ;

src/bin/network/tunconfig/tunconfig.cpp

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2006-2019, Haiku, Inc. All rights Reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *   Alexander von Gluck IV <kallisti5@unixzen.com>
+ */
+
+
+#include <stdio.h>
+#include <String.h>
+
+#include <NetworkInterface.h>
+#include <NetworkRoster.h>
+
+
+static
+status_t
+print_help()
+{
+	fprintf(stderr, "tunconfig\n");
+	fprintf(stderr, "With tunconfig you can create and manage tun/tap devices.\n");
+	fprintf(stderr, "Usage:\n");
+	fprintf(stderr, "  tunconfig show | -a\n");
+	fprintf(stderr, "  tunconfig init <name>\n");
+	fprintf(stderr, "  tunconfig create <name>\n");
+	fprintf(stderr, "  tunconfig delete <name|interface|id>\n");
+	fprintf(stderr, "  tunconfig details <name|interface|id>\n");
+	fprintf(stderr, "\t<name> must be an interface description file\n");
+	
+	return -1;
+}
+
+
+static
+status_t
+show_interface(const char* name)
+{
+	printf("%s\n", name);
+	return B_OK;
+}
+
+
+static
+status_t
+show_all()
+{
+	BNetworkRoster& roster = BNetworkRoster::Default();
+
+	BNetworkInterface interface;
+	uint32 cookie = 0;
+
+	while (roster.GetNextInterface(&cookie, interface) == B_OK) {
+		BNetworkAddress linkAddress;
+		status_t status = interface.GetHardwareAddress(linkAddress);
+		if (status == B_OK && linkAddress.LinkLevelType() == IFT_TUN)
+			show_interface(interface.Name());
+	}
+	return B_OK;
+}
+
+
+int
+main(int argc, char *argv[])
+{
+	if (argc == 2) {
+		if (!strcmp(argv[1], "show") || !strcmp(argv[1], "-a"))
+			return show_all();
+		else
+			return print_help();
+	} else {
+		return print_help();
+	}
+
+	return 0;
+}