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https://github.com/RGBCube/serenity
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c6607719d2
Attempts are spaced out with exponential backoff, cut at 10 minutes per attempt. Also avoid trying to acquire an IP on interfaces that aren't up. Fixes #6126. Fixes #6125.
92 lines
3.3 KiB
C++
92 lines
3.3 KiB
C++
/*
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* Copyright (c) 2020, The SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "DHCPv4.h"
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#include <AK/HashMap.h>
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#include <AK/OwnPtr.h>
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#include <AK/Result.h>
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#include <AK/String.h>
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#include <AK/Vector.h>
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#include <LibCore/UDPServer.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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struct InterfaceDescriptor {
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String m_ifname;
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MACAddress m_mac_address;
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IPv4Address m_current_ip_address { 0, 0, 0, 0 };
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};
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struct DHCPv4Transaction {
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DHCPv4Transaction(InterfaceDescriptor ifname)
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: interface(ifname)
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{
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}
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InterfaceDescriptor interface;
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bool accepted_offer { false };
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bool has_ip { false };
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u32 offered_lease_time { 0 };
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};
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class DHCPv4Client final : public Core::Object {
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C_OBJECT(DHCPv4Client)
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public:
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explicit DHCPv4Client(Vector<InterfaceDescriptor> ifnames_for_immediate_discover, Vector<InterfaceDescriptor> ifnames_for_later);
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virtual ~DHCPv4Client() override;
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void dhcp_discover(const InterfaceDescriptor& ifname);
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void dhcp_request(DHCPv4Transaction& transaction, const DHCPv4Packet& packet);
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void process_incoming(const DHCPv4Packet& packet);
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bool id_is_registered(u32 id) { return m_ongoing_transactions.contains(id); }
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struct Interfaces {
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Vector<InterfaceDescriptor> ready;
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Vector<InterfaceDescriptor> not_ready;
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};
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static Result<Interfaces, String> get_discoverable_interfaces();
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private:
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void try_discover_deferred_ifs();
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HashMap<u32, OwnPtr<DHCPv4Transaction>> m_ongoing_transactions;
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Vector<InterfaceDescriptor> m_ifnames_for_immediate_discover;
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Vector<InterfaceDescriptor> m_ifnames_for_later;
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RefPtr<Core::UDPServer> m_server;
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RefPtr<Core::Timer> m_fail_check_timer;
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int m_max_timer_backoff_interval { 600000 }; // 10 minutes
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void handle_offer(const DHCPv4Packet&, const ParsedDHCPv4Options&);
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void handle_ack(const DHCPv4Packet&, const ParsedDHCPv4Options&);
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void handle_nak(const DHCPv4Packet&, const ParsedDHCPv4Options&);
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};
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