dhcp client: add class DHCPMessage
Add class DHCPMessage for dhcp_client.
This is the class wrapping raw dhcp messages and
providing message processing functions.
Bug: 25642025
TEST=compile
Change-Id: Idf5be4f3f33df492ed7d145c2f65872d284cdcc9
diff --git a/dhcp_message.h b/dhcp_message.h
new file mode 100644
index 0000000..c23db47
--- /dev/null
+++ b/dhcp_message.h
@@ -0,0 +1,89 @@
+//
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef DHCP_CLIENT_DHCP_MESSAGE_H_
+#define DHCP_CLIENT_DHCP_MESSAGE_H_
+
+#include <string>
+
+#include <base/macros.h>
+
+namespace dhcp_client {
+
+class DHCPMessage {
+ public:
+ static const uint8_t kDHCPMessageTypeDiscover = 1;
+ static const uint8_t kDHCPMessageTypeOffer = 2;
+ static const uint8_t kDHCPMessageTypeRequest = 3;
+ static const uint8_t kDHCPMessageTypeDecline = 4;
+ static const uint8_t kDHCPMessageTypeAck = 5;
+ static const uint8_t kDHCPMessageTypeNak = 6;
+ static const uint8_t kDHCPMessageTypeRelease = 7;
+ static const uint8_t kDHCPMessageTypeInform = 8;
+
+ DHCPMessage();
+ ~DHCPMessage();
+ static bool InitFromBuffer(const unsigned char* buffer,
+ size_t length,
+ DHCPMessage* message);
+ uint32_t GetTransactionID();
+ std::string GetClientHardwareAddress();
+
+ private:
+ bool ParseDHCPOptions(const unsigned char* options,
+ size_t options_length);
+ bool IsValid();
+
+ // Message type.
+ uint8_t opcode_;
+ // Hardware address type.
+ uint8_t hardware_address_type_;
+ // Hardware address length.
+ uint8_t hardware_address_length_;
+ // Client sets to zero, optionally used by relay agents
+ // when booting via a relay agent.
+ uint8_t relay_hops_;
+ // Transaction id.
+ uint32_t transaction_id_;
+ // Elapsed time from boot in seconds.
+ uint16_t seconds_;
+ // Broadcast flag
+ uint16_t flags_;
+ // Previously allocated client IP.
+ uint32_t client_ip_address_;
+ // Client IP address.
+ uint32_t your_ip_address_;
+ // IP address of next server to use in bootstrap;
+ // returned in DHCPOFFER, DHCPACK by server.
+ // It should be zero in client's messages.
+ uint32_t next_server_ip_address_;
+ // Relay agent IP address, used in booting via a relay agent.
+ // It should be zero in client's messages.
+ uint32_t agent_ip_address_;
+ // Client's hardware address.
+ std::string client_hardware_address_;
+ // Server host name.
+ std::string servername_;
+ // Boot file name.
+ std::string bootfile_;
+ uint32_t cookie_;
+
+ DISALLOW_COPY_AND_ASSIGN(DHCPMessage);
+};
+
+} // namespace dhcp_client
+
+#endif // DHCP_CLIENT_DHCP_MESSAGE_H_