LineageOS/android_packages_modules_Connectivity
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Flush central DNS cache when things change.

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Flushes the cache for an interface when
either routes or DNS servers change.

Change-Id: I021305f781be669aaa12074dc1cc21511f49eac4
This commit is contained in:
Robert Greenwalt
2011-08-15 12:31:55 -07:00
parent 08ae9bc349
commit 8d77725fa7
1 changed files with 30 additions and 14 deletions
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44
services/java/com/android/server/ConnectivityService.java
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@@ -1778,15 +1778,26 @@ public class ConnectivityService extends IConnectivityManager.Stub {
}
}
mCurrentLinkProperties[netType] = newLp;
updateRoutes(newLp, curLp, mNetConfigs[netType].isDefault());
boolean resetDns = updateRoutes(newLp, curLp, mNetConfigs[netType].isDefault());
if (doReset || resetMask != 0) {
if (doReset || resetMask != 0 || resetDns) {
LinkProperties linkProperties = mNetTrackers[netType].getLinkProperties();
if (linkProperties != null) {
String iface = linkProperties.getInterfaceName();
if (TextUtils.isEmpty(iface) == false) {
if (DBG) log("resetConnections(" + iface + ", " + resetMask + ")");
NetworkUtils.resetConnections(iface, resetMask);
if (doReset || resetMask != 0) {
if (DBG) log("resetConnections(" + iface + ", " + resetMask + ")");
NetworkUtils.resetConnections(iface, resetMask);
}
if (resetDns) {
if (DBG) log("resetting DNS cache for " + iface);
try {
mNetd.flushInterfaceDnsCache(iface);
} catch (Exception e) {
// never crash - catch them all
loge("Exception resetting dns cache: " + e);
}
}
}
}
}
@@ -1808,8 +1819,10 @@ public class ConnectivityService extends IConnectivityManager.Stub {
* is a noop.
* Uses isLinkDefault to determine if default routes should be set or conversely if
* host routes should be set to the dns servers
* returns a boolean indicating the routes changed
*/
private void updateRoutes(LinkProperties newLp, LinkProperties curLp, boolean isLinkDefault) {
private boolean updateRoutes(LinkProperties newLp, LinkProperties curLp,
boolean isLinkDefault) {
Collection<RouteInfo> routesToAdd = null;
CompareResult<InetAddress> dnsDiff = new CompareResult<InetAddress>();
CompareResult<RouteInfo> routeDiff = new CompareResult<RouteInfo>();
@@ -1822,6 +1835,8 @@ public class ConnectivityService extends IConnectivityManager.Stub {
dnsDiff.added = newLp.getDnses();
}
boolean routesChanged = (routeDiff.removed.size() != 0 || routeDiff.added.size() != 0);
for (RouteInfo r : routeDiff.removed) {
if (isLinkDefault || ! r.isDefaultRoute()) {
removeRoute(curLp, r);
@@ -1849,15 +1864,7 @@ public class ConnectivityService extends IConnectivityManager.Stub {
if (!isLinkDefault) {
// handle DNS routes
if (routeDiff.removed.size() == 0 && routeDiff.added.size() == 0) {
// no change in routes, check for change in dns themselves
for (InetAddress oldDns : dnsDiff.removed) {
removeRouteToAddress(curLp, oldDns);
}
for (InetAddress newDns : dnsDiff.added) {
addRouteToAddress(newLp, newDns);
}
} else {
if (routesChanged) {
// routes changed - remove all old dns entries and add new
if (curLp != null) {
for (InetAddress oldDns : curLp.getDnses()) {
@@ -1869,8 +1876,17 @@ public class ConnectivityService extends IConnectivityManager.Stub {
addRouteToAddress(newLp, newDns);
}
}
} else {
// no change in routes, check for change in dns themselves
for (InetAddress oldDns : dnsDiff.removed) {
removeRouteToAddress(curLp, oldDns);
}
for (InetAddress newDns : dnsDiff.added) {
addRouteToAddress(newLp, newDns);
}
}
}
return routesChanged;
}