socket.hh

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/*
 * Copyright (c) 2002-2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 */
 
#ifndef __SOCKET_HH__
#define __SOCKET_HH__
 
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
 
#include <cassert>
#include <functional>
#include <memory>
#include <string>
 
#include "base/named.hh"
 
namespace gem5
{
 
class ListenSocket : public Named
{
  protected:
    static bool listeningDisabled;
    static bool anyListening;
 
    static bool bindToLoopback;
 
  public:
    static void disableAll();
    static bool allDisabled();
 
    static void loopbackOnly();
 
  protected:
    bool listening = false;
    int fd = -1;
 
    void
    setListening()
    {
        listening = true;
        anyListening = true;
    }
 
    /*
     * cleanup resets the static variables back to their default values.
     */
    static void cleanup();
 
    ListenSocket(const std::string &_name);
 
  public:
    virtual ~ListenSocket();
 
    virtual int accept();
    virtual void listen() = 0;
 
    virtual void output(std::ostream &os) const = 0;
 
    int getfd() const { return fd; }
    bool islistening() const { return listening; }
 
    /* Create a socket, adding SOCK_CLOEXEC if available. */
    static int socketCloexec(int domain, int type, int protocol);
    /* Accept a connection, adding SOCK_CLOEXEC if available. */
    static int acceptCloexec(int sockfd, struct sockaddr *addr,
                              socklen_t *addrlen); // end of api_socket
};
 
inline static std::ostream &
operator << (std::ostream &os, const ListenSocket &socket)
{
    socket.output(os);
    return os;
}
 
using ListenSocketPtr = std::unique_ptr<ListenSocket>;
 
class ListenSocketConfig
{
  public:
    using Builder = std::function<ListenSocketPtr(const std::string &name)>;
 
    ListenSocketConfig() {}
    ListenSocketConfig(Builder _builder) : builder(_builder) {}
 
    ListenSocketPtr
    build(const std::string &name) const
    {
        assert(builder);
        return builder(name);
    }
 
    operator bool() const { return (bool)builder; }
 
    static bool parseIni(const std::string &value, ListenSocketConfig &retval);
 
  private:
    Builder builder;
};
 
static inline ListenSocketConfig listenSocketEmptyConfig() { return {}; }
 
// AF_INET based sockets.
 
class ListenSocketInet : public ListenSocket
{
  protected:
    int _port;
 
    virtual bool listen(int port);
 
  public:
    ListenSocketInet(const std::string &_name, int port);
 
    int accept() override;
    void listen() override;
    void output(std::ostream &os) const override;
};
 
ListenSocketConfig listenSocketInetConfig(int port);
 
// AF_UNIX based sockets.
 
class ListenSocketUnix : public ListenSocket
{
  protected:
    virtual size_t prepSockaddrUn(sockaddr_un &addr) const = 0;
 
    void checkPathLength(const std::string &original, size_t max_len);
 
    ListenSocketUnix(const std::string &_name) : ListenSocket(_name) {}
 
  public:
    void listen() override;
};
 
class ListenSocketUnixFile : public ListenSocketUnix
{
  protected:
    std::string dir;
    std::string resolvedDir;
    std::string fname;
 
    bool unlink() const;
 
    size_t prepSockaddrUn(sockaddr_un &addr) const override;
 
  public:
    ListenSocketUnixFile(const std::string &_name, const std::string &_dir,
            const std::string &_fname);
    ~ListenSocketUnixFile();
 
    void listen() override;
    void output(std::ostream &os) const override;
};
 
ListenSocketConfig listenSocketUnixFileConfig(
        std::string dir, std::string fname);
 
class ListenSocketUnixAbstract : public ListenSocketUnix
{
  protected:
    std::string path;
 
    size_t prepSockaddrUn(sockaddr_un &addr) const override;
 
  public:
    ListenSocketUnixAbstract(
            const std::string &_name, const std::string &_path);
 
    void output(std::ostream &os) const override;
};
 
ListenSocketConfig listenSocketUnixAbstractConfig(std::string path);
 
} // namespace gem5
 
#endif //__SOCKET_HH__