public String getDefaultInterface(IPAddress destination) {
ArrayList<RouteConfig> matches = new ArrayList<RouteConfig>();
RouteConfig[] routes = getRoutes();
for (int i = 0; i < routes.length; i++) {
if (matchesRoute(destination, routes[i])) {
matches.add(routes[i]);
}
}
if (matches.size() > 0) {
RouteConfig dRoute = (RouteConfig) matches.get(0);
for (int i = 0; i < routes.length; i++) {
if (dRoute.getMetric() > routes[i].getMetric()) {
dRoute = routes[i];
}
}
s_logger.debug(
"Found defualt interface "
+ dRoute.getInterfaceName()
+ " for destination "
+ destination.getHostAddress());
return dRoute.getInterfaceName();
}
s_logger.debug("No default interface exists for destination " + destination.getHostAddress());
return null;
}
public RouteConfig getDefaultRoute(String iface) {
RouteConfig[] routes = getRoutes();
RouteConfig defaultRoute;
ArrayList<RouteConfig> defaultRoutes = new ArrayList<RouteConfig>();
// Search through routes and construct a list of all default routes for the specified interface
for (int i = 0; i < routes.length; i++) {
if (routes[i].getInterfaceName().compareTo(iface) == 0
&& routes[i].getDestination().getHostAddress().compareTo("0.0.0.0") == 0) {
defaultRoutes.add(routes[i]);
}
}
// If no default routes exist, return null
if (defaultRoutes.size() == 0) {
s_logger.debug("No default routes exist for inteface: " + iface);
return null;
}
// Set the default route to the first one in the list
defaultRoute = (RouteConfig) defaultRoutes.get(0);
// Search for the default route with the lowest metric value
for (int i = 1; i < defaultRoutes.size(); i++) {
if (defaultRoute.getMetric() > ((RouteConfig) defaultRoutes.get(i)).getMetric()) {
defaultRoute = (RouteConfig) defaultRoutes.get(i);
}
}
s_logger.info("Default route found for interface: " + iface);
s_logger.debug("Default route:\n" + defaultRoute.getDescription());
return defaultRoute;
}
public void addStaticRoute(
IPAddress destination, IPAddress gateway, IPAddress netmask, String iface, int metric)
throws Exception {
RouteConfig tmpRoute = null;
StringBuffer command = new StringBuffer();
command.append("route add -net " + destination.getHostAddress() + " ");
if (netmask != null) {
command.append("netmask " + netmask.getHostAddress() + " ");
}
if (gateway != null) {
if ((gateway.getHostAddress().compareTo("0.0.0.0") != 0)
&& (gateway.getHostAddress().compareTo("127.0.0.1") != 0)) {
command.append("gw " + gateway.getHostAddress() + " ");
}
}
if (iface != null) {
command.append("dev " + iface + " ");
}
if (metric != 0 && metric != -1) {
command.append("metric " + metric);
}
SafeProcess proc = null;
try {
s_logger.debug("Executing command: " + command.toString());
proc = ProcessUtil.exec(command.toString());
proc.waitFor();
if (proc.exitValue() != 0) {
s_logger.error("Error adding static Route: " + command.toString());
throw new Exception("Error adding Static Route");
}
} catch (IOException e) {
s_logger.error("Error executing command: route -n");
throw e;
} finally {
if (proc != null) ProcessUtil.destroy(proc);
}
if (destination instanceof IP4Address) {
tmpRoute =
new RouteConfigIP4(
(IP4Address) destination, (IP4Address) gateway, (IP4Address) netmask, iface, -1);
} else if (destination instanceof IP6Address) {
tmpRoute =
new RouteConfigIP6(
(IP6Address) destination, (IP6Address) gateway, (IP6Address) netmask, iface, -1);
}
s_logger.info("Static route added successfully");
s_logger.debug(tmpRoute.getDescription());
}
private boolean matchesRoute(IPAddress destination, RouteConfig route) {
byte mask = (byte) 0xFF;
byte[] dest = destination.getAddress();
byte[] routeMask = route.getNetmask().getAddress();
byte[] routeDest = route.getDestination().getAddress();
byte[] dest_masked = new byte[4];
for (int i = 0; i < 4; i++) {
if (routeMask[i] == mask) {
dest_masked[i] = dest[i];
} else {
dest_masked[i] = 0;
}
}
for (int i = 0; i < 4; i++) {
if (dest_masked[i] != routeDest[i]) {
return false;
}
}
return true;
}