1 files changed, 168 insertions, 0 deletions
diff --git a/app/src/fil/libre/repwifiapp/network/Engine.java b/app/src/fil/libre/repwifiapp/network/Engine.java
new file mode 100644
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--- /dev/null
+++ b/app/src/fil/libre/repwifiapp/network/Engine.java
@@ -0,0 +1,168 @@
+//
+// Copyright 2017, 2018 Filippo "Fil" Bergamo <fil.bergamo@riseup.net>
+// 
+// This file is part of RepWifiApp.
+//
+// RepWifiApp is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// RepWifiApp 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 RepWifiApp.  If not, see <http://www.gnu.org/licenses/>.
+// 
+// ********************************************************************
+
+package fil.libre.repwifiapp.network;
+
+import fil.libre.repwifiapp.Commons;
+import fil.libre.repwifiapp.helpers.Logger;
+import fil.libre.repwifiapp.helpers.RootCommand;
+import java.net.NetworkInterface;
+import java.net.SocketException;
+import java.util.Enumeration;
+
+public abstract class Engine implements IEngine {
+    
+    public static final String PIDFILE_DHCPCD = "/data/misc/dhcp/dhcpcd-wlan0.pid";
+        
+    
+    @Override
+    public AccessPointInfo[] getAvailableNetworks() {
+
+        Logger.logDebug("getAvailableNetworks():");
+
+        if (!WpaSupplicant.start()) {
+            Logger.logError("Failed starting wpa_supplicant");
+            return null;
+        }
+
+        if (!WpaCli.scanNetworks()) {
+            Logger.logError("failed scanning networks");
+            return null;
+        }
+
+        String scanRes = WpaCli.getScanResults();
+
+        if (scanRes == null) {
+            Logger.logError("failed getting scan results");
+            return null;
+        }
+
+        AccessPointInfo[] a = AccessPointInfo.parseScanResult(scanRes);
+        if (a == null) {
+            Logger.logError("Unable to parse scan file into AccessPointInfo array");
+            return a;
+        }
+
+        Logger.logDebug("# of APs found: " + a.length);
+
+        return a;
+
+    }
+    
+    public ConnectionStatus getConnectionStatus() {
+        
+        ConnectionStatus s = WpaCli.getConnectionStatus();
+        if (s == null){
+            return null;
+        }
+        
+        String ifcfg = getIfconfigString();
+        s.parseIfconfigOutput(ifcfg);
+        return s;        
+    }
+
+    private String getIfconfigString(){
+        
+        // needs root for accessing encapsulation and hardware address (tested).
+        RootCommand cmd = new RootCommand("ifconfig " + WpaSupplicant.INTERFACE_NAME);
+        
+        try {
+            if (cmd.execute() != 0){
+                Logger.logError("FAILED to run ifconfig to obtain interface info.");
+                return null;
+            }
+        } catch (Exception e) {
+            Logger.logError("Exception while running ifconfig.", e);
+            return null;
+        }
+        
+        return cmd.getOutput();        
+        
+    }
+
+    @Override
+    public abstract int connect(AccessPointInfo info);
+
+    @Override
+    public boolean disconnect() {
+
+        return WpaCli.disconnect();
+
+    }
+
+    public static boolean isInterfaceAvailable(String ifaceName) throws SocketException {
+
+        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
+        while (interfaces.hasMoreElements()) {
+            NetworkInterface nif = interfaces.nextElement();
+            String nm = nif.getName();
+            if (nm.equals(ifaceName)) {
+                return true;
+            }
+        }
+        return false;
+
+    }
+
+    public int runDhcpcd() throws Exception{
+        // needs root
+        // option -w avoids dhcpcd forking to background,
+        // in order to keep control over its exit code, and be able to wait for it.
+        // option -A avoids ARP IP checking, we use it to save some seconds in the connection process.
+        // option -t <timeout> sets time out for obtaining a lease.
+        String cmdText = "dhcpcd -w -A -t " + Commons.WAIT_FOR_DHCPCD + " " + WpaSupplicant.INTERFACE_NAME;
+        RootCommand su = new RootCommand(cmdText);
+        return su.execute();
+    }
+    
+    public int runDhcpcd(DhcpSettings dhcpConfig) throws Exception{
+        
+        if (dhcpConfig == null || dhcpConfig.useDhcp){
+            Logger.logDebug("running dhchpc without dhcp settings, reverting to dhcp");
+            return runDhcpcd();
+        }
+        
+        Logger.logDebug("Running dhcpcd with custom ip settings");
+        String cmdMask = "dhcpcd -w -A -S ip_address=%s -S routers=%s -t %d %s";
+        String cmd = String.format(cmdMask,
+                                    dhcpConfig.getStaticIPwithMask(),
+                                    dhcpConfig.getDefaultGateway(),
+                                    Commons.WAIT_FOR_DHCPCD,
+                                    WpaSupplicant.INTERFACE_NAME);
+        
+        RootCommand su = new RootCommand(cmd);
+        return su.execute();
+        
+    }
+
+    public static boolean killDhcpcd(){
+        if (! RootCommand.executeRootCmd("killall -SIGINT dhcpcd")){
+            return false;
+        }
+        return RootCommand.executeRootCmd("rm " + PIDFILE_DHCPCD);
+    }
+    
+    public boolean interfaceUp() {
+        // needs root (tested)
+        return RootCommand.executeRootCmd("ifconfig " + WpaSupplicant.INTERFACE_NAME + " up");
+    }
+
+   
+}