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Support DHCP replies with multiple default gateways.

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Just use the first one for compatibility with the legacy client.

Bug: 23975855
Change-Id: Id6a0b0de32e8947c12c02eb9a3be417e2f82c99a
This commit is contained in:
Lorenzo Colitti
2015-09-17 07:55:29 +09:00
parent b19238c488
commit 025f4a5aae
4 changed files with 54 additions and 15 deletions
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4
services/net/java/android/net/dhcp/DhcpAckPacket.java
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@@ -46,7 +46,7 @@ class DhcpAckPacket extends DhcpPacket {
return s + " ACK: your new IP " + mYourIp +
", netmask " + mSubnetMask +
", gateway " + mGateway + dnsServers +
", gateways " + mGateways + dnsServers +
", lease time " + mLeaseTime;
}
@@ -79,7 +79,7 @@ class DhcpAckPacket extends DhcpPacket {
}
addTlv(buffer, DHCP_SUBNET_MASK, mSubnetMask);
addTlv(buffer, DHCP_ROUTER, mGateway);
addTlv(buffer, DHCP_ROUTER, mGateways);
addTlv(buffer, DHCP_DOMAIN_NAME, mDomainName);
addTlv(buffer, DHCP_BROADCAST_ADDRESS, mBroadcastAddress);
addTlv(buffer, DHCP_DNS_SERVER, mDnsServers);

4
services/net/java/android/net/dhcp/DhcpOfferPacket.java
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@@ -48,7 +48,7 @@ class DhcpOfferPacket extends DhcpPacket {
}
return s + " OFFER, ip " + mYourIp + ", mask " + mSubnetMask +
dnsServers + ", gateway " + mGateway +
dnsServers + ", gateways " + mGateways +
" lease time " + mLeaseTime + ", domain " + mDomainName;
}
@@ -81,7 +81,7 @@ class DhcpOfferPacket extends DhcpPacket {
}
addTlv(buffer, DHCP_SUBNET_MASK, mSubnetMask);
addTlv(buffer, DHCP_ROUTER, mGateway);
addTlv(buffer, DHCP_ROUTER, mGateways);
addTlv(buffer, DHCP_DOMAIN_NAME, mDomainName);
addTlv(buffer, DHCP_BROADCAST_ADDRESS, mBroadcastAddress);
addTlv(buffer, DHCP_DNS_SERVER, mDnsServers);

27
services/net/java/android/net/dhcp/DhcpPacket.java
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@@ -128,7 +128,7 @@ abstract class DhcpPacket {
* DHCP Optional Type: DHCP Router
*/
protected static final byte DHCP_ROUTER = 3;
protected Inet4Address mGateway;
protected List <Inet4Address> mGateways;
/**
* DHCP Optional Type: DHCP DNS Server
@@ -706,8 +706,8 @@ abstract class DhcpPacket {
Inet4Address nextIp;
Inet4Address relayIp;
byte[] clientMac;
List<Inet4Address> dnsServers = new ArrayList<Inet4Address>();
Inet4Address gateway = null; // aka router
List<Inet4Address> dnsServers = new ArrayList<>();
List<Inet4Address> gateways = new ArrayList<>(); // aka router
Inet4Address serverIdentifier = null;
Inet4Address netMask = null;
String message = null;
@@ -883,8 +883,9 @@ abstract class DhcpPacket {
expectedLen = 4;
break;
case DHCP_ROUTER:
gateway = readIpAddress(packet);
expectedLen = 4;
for (expectedLen = 0; expectedLen < optionLen; expectedLen += 4) {
gateways.add(readIpAddress(packet));
}
break;
case DHCP_DNS_SERVER:
for (expectedLen = 0; expectedLen < optionLen; expectedLen += 4) {
@@ -1020,7 +1021,7 @@ abstract class DhcpPacket {
newPacket.mBroadcastAddress = bcAddr;
newPacket.mDnsServers = dnsServers;
newPacket.mDomainName = domainName;
newPacket.mGateway = gateway;
newPacket.mGateways = gateways;
newPacket.mHostName = hostName;
newPacket.mLeaseTime = leaseTime;
newPacket.mMessage = message;
@@ -1076,7 +1077,11 @@ abstract class DhcpPacket {
} catch (IllegalArgumentException e) {
return null;
}
results.gateway = mGateway;
if (mGateways.size() > 0) {
results.gateway = mGateways.get(0);
}
results.dnsServers.addAll(mDnsServers);
results.domains = mDomainName;
results.serverAddress = mServerIdentifier;
@@ -1118,11 +1123,11 @@ abstract class DhcpPacket {
public static ByteBuffer buildOfferPacket(int encap, int transactionId,
boolean broadcast, Inet4Address serverIpAddr, Inet4Address clientIpAddr,
byte[] mac, Integer timeout, Inet4Address netMask, Inet4Address bcAddr,
Inet4Address gateway, List<Inet4Address> dnsServers,
List<Inet4Address> gateways, List<Inet4Address> dnsServers,
Inet4Address dhcpServerIdentifier, String domainName) {
DhcpPacket pkt = new DhcpOfferPacket(
transactionId, (short) 0, broadcast, serverIpAddr, INADDR_ANY, clientIpAddr, mac);
pkt.mGateway = gateway;
pkt.mGateways = gateways;
pkt.mDnsServers = dnsServers;
pkt.mLeaseTime = timeout;
pkt.mDomainName = domainName;
@@ -1138,11 +1143,11 @@ abstract class DhcpPacket {
public static ByteBuffer buildAckPacket(int encap, int transactionId,
boolean broadcast, Inet4Address serverIpAddr, Inet4Address clientIpAddr,
byte[] mac, Integer timeout, Inet4Address netMask, Inet4Address bcAddr,
Inet4Address gateway, List<Inet4Address> dnsServers,
List<Inet4Address> gateways, List<Inet4Address> dnsServers,
Inet4Address dhcpServerIdentifier, String domainName) {
DhcpPacket pkt = new DhcpAckPacket(
transactionId, (short) 0, broadcast, serverIpAddr, INADDR_ANY, clientIpAddr, mac);
pkt.mGateway = gateway;
pkt.mGateways = gateways;
pkt.mDnsServers = dnsServers;
pkt.mLeaseTime = timeout;
pkt.mDomainName = domainName;

34
services/tests/servicestests/src/android/net/dhcp/DhcpPacketTest.java
View File

@@ -550,4 +550,38 @@ public class DhcpPacketTest extends TestCase {
"209.129.128.3,209.129.148.3,209.129.128.6",
"wvm.edu", "10.1.105.252", null, 86400, false, dhcpResults);
}
@SmallTest
public void testMultipleRouters() throws Exception {
final ByteBuffer packet = ByteBuffer.wrap(HexEncoding.decode((
// Ethernet header.
"fc3d93000000" + "081735000000" + "0800" +
// IP header.
"45000148c2370000ff117ac2c0a8bd02ffffffff" +
// UDP header. TODO: fix invalid checksum (due to MAC address obfuscation).
"0043004401343beb" +
// BOOTP header.
"0201060027f518e20000800000000000c0a8bd310000000000000000" +
// MAC address.
"fc3d9300000000000000000000000000" +
// Server name.
"0000000000000000000000000000000000000000000000000000000000000000" +
"0000000000000000000000000000000000000000000000000000000000000000" +
// File.
"0000000000000000000000000000000000000000000000000000000000000000" +
"0000000000000000000000000000000000000000000000000000000000000000" +
"0000000000000000000000000000000000000000000000000000000000000000" +
"0000000000000000000000000000000000000000000000000000000000000000" +
// Options.
"638253633501023604c0abbd023304000070803a04000038403b04000062700104ffffff00" +
"0308c0a8bd01ffffff0006080808080808080404ff000000000000"
).toCharArray(), false));
DhcpPacket offerPacket = DhcpPacket.decodeFullPacket(packet, ENCAP_L2);
assertTrue(offerPacket instanceof DhcpOfferPacket);
assertEquals("FC3D93000000", HexDump.toHexString(offerPacket.getClientMac()));
DhcpResults dhcpResults = offerPacket.toDhcpResults();
assertDhcpResults("192.168.189.49/24", "192.168.189.1", "8.8.8.8,8.8.4.4",
null, "192.171.189.2", null, 28800, false, dhcpResults);
}
}