LineageOS/android_packages_modules_Connectivity
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Second pass tying into dns cache per interface

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Set dns servers for secondary nets and attach the
processes (pids) that are using the secondary nets
to the secondary nets associated dns cache.

bug:5465296
Change-Id: I1eaf92d5c6b81d287e9fb2763b3d972d9de34395
This commit is contained in:
Mattias Falk
2011-08-23 14:15:13 +02:00
committed by Robert Greenwalt
parent c9083111d9
commit d697aa2e38
1 changed files with 43 additions and 114 deletions
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157
services/java/com/android/server/ConnectivityService.java
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@@ -183,7 +183,7 @@ public class ConnectivityService extends IConnectivityManager.Stub {
* A per Net list of the PID's that requested access to the net
* used both as a refcount and for per-PID DNS selection
*/
private List mNetRequestersPids[];
private List<Integer> mNetRequestersPids[];
// priority order of the nettrackers
// (excluding dynamically set mNetworkPreference)
@@ -199,7 +199,6 @@ public class ConnectivityService extends IConnectivityManager.Stub {
private int mDefaultConnectionSequence = 0;
private Object mDnsLock = new Object();
private int mNumDnsEntries;
private boolean mDnsOverridden = false;
private boolean mTestMode;
@@ -507,15 +506,14 @@ public class ConnectivityService extends IConnectivityManager.Stub {
}
}
mNetRequestersPids = new ArrayList[ConnectivityManager.MAX_NETWORK_TYPE+1];
mNetRequestersPids =
(List<Integer> [])new ArrayList[ConnectivityManager.MAX_NETWORK_TYPE+1];
for (int i : mPriorityList) {
mNetRequestersPids[i] = new ArrayList();
mNetRequestersPids[i] = new ArrayList<Integer>();
}
mFeatureUsers = new ArrayList<FeatureUser>();
mNumDnsEntries = 0;
mTestMode = SystemProperties.get("cm.test.mode").equals("true")
&& SystemProperties.get("ro.build.type").equals("eng");
@@ -1316,6 +1314,7 @@ public class ConnectivityService extends IConnectivityManager.Stub {
Integer currentPid = new Integer(pid);
mNetRequestersPids[usedNetworkType].remove(currentPid);
reassessPidDns(pid, true);
flushVmDnsCache();
if (mNetRequestersPids[usedNetworkType].size() != 0) {
if (VDBG) {
log("stopUsingNetworkFeature: net " + networkType + ": " + feature +
@@ -1697,9 +1696,8 @@ public class ConnectivityService extends IConnectivityManager.Stub {
* in accordance with network preference policies.
*/
if (!mNetConfigs[prevNetType].isDefault()) {
List pids = mNetRequestersPids[prevNetType];
for (int i = 0; i<pids.size(); i++) {
Integer pid = (Integer)pids.get(i);
List<Integer> pids = mNetRequestersPids[prevNetType];
for (Integer pid : pids) {
// will remove them because the net's no longer connected
// need to do this now as only now do we know the pids and
// can properly null things that are no longer referenced.
@@ -2261,6 +2259,7 @@ public class ConnectivityService extends IConnectivityManager.Stub {
}
}
if (resetDns) {
flushVmDnsCache();
if (VDBG) log("resetting DNS cache for " + iface);
try {
mNetd.flushInterfaceDnsCache(iface);
@@ -2427,9 +2426,10 @@ public class ConnectivityService extends IConnectivityManager.Stub {
* on the highest priority active net which this process requested.
* If there aren't any, clear it out
*/
private void reassessPidDns(int myPid, boolean doBump)
private void reassessPidDns(int pid, boolean doBump)
{
if (VDBG) log("reassessPidDns for pid " + myPid);
if (VDBG) log("reassessPidDns for pid " + pid);
Integer myPid = new Integer(pid);
for(int i : mPriorityList) {
if (mNetConfigs[i].isDefault()) {
continue;
@@ -2439,61 +2439,25 @@ public class ConnectivityService extends IConnectivityManager.Stub {
!nt.isTeardownRequested()) {
LinkProperties p = nt.getLinkProperties();
if (p == null) continue;
List pids = mNetRequestersPids[i];
for (int j=0; j<pids.size(); j++) {
Integer pid = (Integer)pids.get(j);
if (pid.intValue() == myPid) {
Collection<InetAddress> dnses = p.getDnses();
writePidDns(dnses, myPid);
if (doBump) {
bumpDns();
}
return;
if (mNetRequestersPids[i].contains(myPid)) {
try {
mNetd.setDnsInterfaceForPid(p.getInterfaceName(), pid);
} catch (Exception e) {
Slog.e(TAG, "exception reasseses pid dns: " + e);
}
return;
}
}
}
// nothing found - delete
for (int i = 1; ; i++) {
String prop = "net.dns" + i + "." + myPid;
if (SystemProperties.get(prop).length() == 0) {
if (doBump) {
bumpDns();
}
return;
}
SystemProperties.set(prop, "");
try {
mNetd.clearDnsInterfaceForPid(pid);
} catch (Exception e) {
Slog.e(TAG, "exception clear interface from pid: " + e);
}
}
// return true if results in a change
private boolean writePidDns(Collection <InetAddress> dnses, int pid) {
int j = 1;
boolean changed = false;
for (InetAddress dns : dnses) {
String dnsString = dns.getHostAddress();
if (changed || !dnsString.equals(SystemProperties.get("net.dns" + j + "." + pid))) {
changed = true;
SystemProperties.set("net.dns" + j + "." + pid, dns.getHostAddress());
}
j++;
}
return changed;
}
private void bumpDns() {
/*
* Bump the property that tells the name resolver library to reread
* the DNS server list from the properties.
*/
String propVal = SystemProperties.get("net.dnschange");
int n = 0;
if (propVal.length() != 0) {
try {
n = Integer.parseInt(propVal);
} catch (NumberFormatException e) {}
}
SystemProperties.set("net.dnschange", "" + (n+1));
private void flushVmDnsCache() {
/*
* Tell the VMs to toss their DNS caches
*/
@@ -2512,56 +2476,23 @@ public class ConnectivityService extends IConnectivityManager.Stub {
}
// Caller must grab mDnsLock.
private boolean updateDns(String network, String iface,
private void updateDnsLocked(String network, String iface,
Collection<InetAddress> dnses, String domains) {
boolean changed = false;
int last = 0;
if (dnses.size() == 0 && mDefaultDns != null) {
++last;
String value = mDefaultDns.getHostAddress();
if (!value.equals(SystemProperties.get("net.dns1"))) {
if (DBG) {
loge("no dns provided for " + network + " - using " + value);
}
changed = true;
SystemProperties.set("net.dns1", value);
dnses = new ArrayList();
dnses.add(mDefaultDns);
if (DBG) {
loge("no dns provided for " + network + " - using " + mDefaultDns.getHostAddress());
}
} else {
for (InetAddress dns : dnses) {
++last;
String key = "net.dns" + last;
String value = dns.getHostAddress();
if (!changed && value.equals(SystemProperties.get(key))) {
continue;
}
if (VDBG) {
log("adding dns " + value + " for " + network);
}
changed = true;
SystemProperties.set(key, value);
}
}
for (int i = last + 1; i <= mNumDnsEntries; ++i) {
String key = "net.dns" + i;
if (VDBG) log("erasing " + key);
changed = true;
SystemProperties.set(key, "");
}
mNumDnsEntries = last;
if (SystemProperties.get("net.dns.search").equals(domains) == false) {
SystemProperties.set("net.dns.search", domains);
changed = true;
}
if (changed) {
try {
mNetd.setDnsServersForInterface(iface, NetworkUtils.makeStrings(dnses), domains);
mNetd.setDefaultInterfaceForDns(iface);
} catch (Exception e) {
if (DBG) loge("exception setting default dns interface: " + e);
}
try {
mNetd.setDnsServersForInterface(iface, NetworkUtils.makeStrings(dnses), domains);
mNetd.setDefaultInterfaceForDns(iface);
} catch (Exception e) {
if (DBG) loge("exception setting default dns interface: " + e);
}
return changed;
}
private void handleDnsConfigurationChange(int netType) {
@@ -2571,12 +2502,11 @@ public class ConnectivityService extends IConnectivityManager.Stub {
LinkProperties p = nt.getLinkProperties();
if (p == null) return;
Collection<InetAddress> dnses = p.getDnses();
boolean changed = false;
if (mNetConfigs[netType].isDefault()) {
String network = nt.getNetworkInfo().getTypeName();
synchronized (mDnsLock) {
if (!mDnsOverridden) {
changed = updateDns(network, p.getInterfaceName(), dnses, p.getDomains());
updateDnsLocked(network, p.getInterfaceName(), dnses, p.getDomains());
}
}
} else {
@@ -2587,13 +2517,16 @@ public class ConnectivityService extends IConnectivityManager.Stub {
if (DBG) loge("exception setting dns servers: " + e);
}
// set per-pid dns for attached secondary nets
List pids = mNetRequestersPids[netType];
for (int y=0; y< pids.size(); y++) {
Integer pid = (Integer)pids.get(y);
changed = writePidDns(dnses, pid.intValue());
List<Integer> pids = mNetRequestersPids[netType];
for (Integer pid : pids) {
try {
mNetd.setDnsInterfaceForPid(p.getInterfaceName(), pid);
} catch (Exception e) {
Slog.e(TAG, "exception setting interface for pid: " + e);
}
}
}
if (changed) bumpDns();
flushVmDnsCache();
}
}
@@ -2652,7 +2585,7 @@ public class ConnectivityService extends IConnectivityManager.Stub {
pw.increaseIndent();
for (int net : mPriorityList) {
String pidString = net + ": ";
for (Object pid : mNetRequestersPids[net]) {
for (Integer pid : mNetRequestersPids[net]) {
pidString = pidString + pid.toString() + ", ";
}
pw.println(pidString);
@@ -3354,14 +3287,10 @@ public class ConnectivityService extends IConnectivityManager.Stub {
String domains = buffer.toString().trim();
// Apply DNS changes.
boolean changed = false;
synchronized (mDnsLock) {
changed = updateDns("VPN", "VPN", addresses, domains);
updateDnsLocked("VPN", "VPN", addresses, domains);
mDnsOverridden = true;
}
if (changed) {
bumpDns();
}
// Temporarily disable the default proxy.
synchronized (mDefaultProxyLock) {