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f98ca35b83
When ProcFS could no longer allocate KBuffer objects to serve calls to read, it would just return 0, indicating EOF. This then triggered parsing errors because code assumed it read the file. Because read isn't supposed to return ENOMEM, change ProcFS to populate the file data upon file open or seek to the beginning. This also means that calls to open can now return ENOMEM if needed. This allows the caller to either be able to successfully open the file and read it, or fail to open it in the first place.
125 lines
5.3 KiB
C++
125 lines
5.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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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 <AK/InlineLinkedList.h>
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#include <Kernel/DoubleBuffer.h>
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#include <Kernel/Net/Socket.h>
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namespace Kernel {
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class FileDescription;
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class LocalSocket final : public Socket
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, public InlineLinkedListNode<LocalSocket> {
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friend class InlineLinkedListNode<LocalSocket>;
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public:
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static KResultOr<NonnullRefPtr<Socket>> create(int type);
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virtual ~LocalSocket() override;
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KResult sendfd(const FileDescription& socket_description, FileDescription& passing_description);
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KResultOr<NonnullRefPtr<FileDescription>> recvfd(const FileDescription& socket_description);
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static void for_each(Function<void(const LocalSocket&)>);
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StringView socket_path() const;
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String absolute_path(const FileDescription& description) const override;
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// ^Socket
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virtual KResult bind(Userspace<const sockaddr*>, socklen_t) override;
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virtual KResult connect(FileDescription&, Userspace<const sockaddr*>, socklen_t, ShouldBlock = ShouldBlock::Yes) override;
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virtual KResult listen(size_t) override;
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virtual void get_local_address(sockaddr*, socklen_t*) override;
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virtual void get_peer_address(sockaddr*, socklen_t*) override;
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virtual KResult attach(FileDescription&) override;
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virtual void detach(FileDescription&) override;
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virtual bool can_read(const FileDescription&, size_t) const override;
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virtual bool can_write(const FileDescription&, size_t) const override;
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virtual KResultOr<size_t> sendto(FileDescription&, const UserOrKernelBuffer&, size_t, int, Userspace<const sockaddr*>, socklen_t) override;
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virtual KResultOr<size_t> recvfrom(FileDescription&, UserOrKernelBuffer&, size_t, int flags, Userspace<sockaddr*>, Userspace<socklen_t*>, timeval&) override;
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virtual KResult getsockopt(FileDescription&, int level, int option, Userspace<void*>, Userspace<socklen_t*>) override;
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virtual KResult chown(FileDescription&, uid_t, gid_t) override;
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virtual KResult chmod(FileDescription&, mode_t) override;
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private:
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explicit LocalSocket(int type);
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virtual const char* class_name() const override { return "LocalSocket"; }
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virtual bool is_local() const override { return true; }
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bool has_attached_peer(const FileDescription&) const;
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static Lockable<InlineLinkedList<LocalSocket>>& all_sockets();
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DoubleBuffer* receive_buffer_for(FileDescription&);
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DoubleBuffer* send_buffer_for(FileDescription&);
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NonnullRefPtrVector<FileDescription>& sendfd_queue_for(const FileDescription&);
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NonnullRefPtrVector<FileDescription>& recvfd_queue_for(const FileDescription&);
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void set_connect_side_role(Role connect_side_role, bool force_evaluate_block_conditions = false)
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{
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auto previous = m_connect_side_role;
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m_connect_side_role = connect_side_role;
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if (previous != m_connect_side_role || force_evaluate_block_conditions)
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evaluate_block_conditions();
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}
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// An open socket file on the filesystem.
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RefPtr<FileDescription> m_file;
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uid_t m_prebind_uid { 0 };
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gid_t m_prebind_gid { 0 };
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mode_t m_prebind_mode { 0 };
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// A single LocalSocket is shared between two file descriptions
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// on the connect side and the accept side; so we need to store
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// an additional role for the connect side and differentiate
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// between them.
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Role m_connect_side_role { Role::None };
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FileDescription* m_connect_side_fd { nullptr };
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virtual Role role(const FileDescription& description) const override
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{
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if (m_connect_side_fd == &description)
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return m_connect_side_role;
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return m_role;
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}
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bool m_bound { false };
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bool m_accept_side_fd_open { false };
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sockaddr_un m_address { 0, { 0 } };
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DoubleBuffer m_for_client;
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DoubleBuffer m_for_server;
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NonnullRefPtrVector<FileDescription> m_fds_for_client;
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NonnullRefPtrVector<FileDescription> m_fds_for_server;
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// for InlineLinkedList
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LocalSocket* m_prev { nullptr };
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LocalSocket* m_next { nullptr };
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};
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}
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