229 lines
10 KiB
C++
229 lines
10 KiB
C++
/// \file socket.h
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/// A handy Socket wrapper library.
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/// Written by Jaron Vietor in 2010 for DDVTech
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#pragma once
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#include <arpa/inet.h>
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#include <deque>
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#include <errno.h>
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#include <fcntl.h>
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#include <sstream>
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#include <stdio.h>
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#include <string.h>
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#include <string>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include "util.h"
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#ifdef SSL
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/debug.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/error.h"
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#include "mbedtls/net.h"
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#include "mbedtls/ssl.h"
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#endif
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// for being friendly with Socket::Connection down below
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namespace Buffer{
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class user;
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}
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/// Holds Socket tools.
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namespace Socket{
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void hostBytesToStr(const char *bytes, size_t len, std::string &target);
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bool isBinAddress(const std::string &binAddr, std::string matchTo);
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bool matchIPv6Addr(const std::string &A, const std::string &B, uint8_t prefix);
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std::string getBinForms(std::string addr);
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/// Returns true if given human-readable address (address, not hostname) is a local address.
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bool isLocal(const std::string &host);
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/// Returns true if given human-readable hostname is a local address.
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bool isLocalhost(const std::string &host);
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bool checkTrueSocket(int sock);
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std::string resolveHostToBestExternalAddrGuess(const std::string &host, int family = AF_UNSPEC,
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const std::string &hint = "");
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bool getSocketName(int fd, std::string &host, uint32_t &port);
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bool getPeerName(int fd, std::string &host, uint32_t &port);
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bool getPeerName(int fd, std::string &host, uint32_t &port, sockaddr * tmpaddr, socklen_t * addrlen);
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/// A buffer made out of std::string objects that can be efficiently read from and written to.
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class Buffer{
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private:
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std::deque<std::string> data;
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public:
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std::string splitter; ///< String to automatically split on if encountered. \n by default
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Buffer();
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unsigned int size();
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unsigned int bytes(unsigned int max);
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unsigned int bytesToSplit();
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void append(const std::string &newdata);
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void append(const char *newdata, const unsigned int newdatasize);
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void prepend(const std::string &newdata);
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void prepend(const char *newdata, const unsigned int newdatasize);
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std::string &get();
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bool available(unsigned int count);
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bool available(unsigned int count) const;
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std::string remove(unsigned int count);
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std::string copy(unsigned int count);
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void clear();
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};
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// Buffer
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/// This class is for easy communicating through sockets, either TCP or Unix.
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/// Internally, sSend and sRecv hold the file descriptor to read/write from/to.
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/// If they are not identical and sRecv is closed but sSend still open, reading from sSend will be attempted.
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class Connection{
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protected:
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void clear(); ///< Clears the internal data structure. Meant only for use in constructors.
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bool isTrueSocket;
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int sSend; ///< Write end of socket.
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int sRecv; ///< Read end of socket.
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std::string remotehost; ///< Stores remote host address.
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std::string boundaddr; ///< Stores bound interface address.
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struct sockaddr_in6 remoteaddr; ///< Stores remote host address.
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uint64_t up;
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uint64_t down;
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long long int conntime;
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Buffer downbuffer; ///< Stores temporary data coming in.
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int iread(void *buffer, int len, int flags = 0); ///< Incremental read call.
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bool iread(Buffer &buffer, int flags = 0); ///< Incremental write call that is compatible with Socket::Buffer.
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void setBoundAddr();
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protected:
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std::string lastErr; ///< Stores last error, if any.
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#ifdef SSL
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/// optional extension that uses mbedtls for SSL
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bool sslConnected;
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int ssl_iread(void *buffer, int len, int flags = 0); ///< Incremental read call.
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unsigned int ssl_iwrite(const void *buffer, int len); ///< Incremental write call.
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mbedtls_net_context *server_fd;
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mbedtls_entropy_context *entropy;
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mbedtls_ctr_drbg_context *ctr_drbg;
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mbedtls_ssl_context *ssl;
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mbedtls_ssl_config *conf;
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#endif
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public:
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// friends
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friend class ::Buffer::user;
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// constructors
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Connection(); ///< Create a new disconnected base socket.
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Connection(int sockNo); ///< Create a new base socket.
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Connection(std::string hostname, int port, bool nonblock, bool with_ssl = false); ///< Create a new TCP socket.
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Connection(std::string adres, bool nonblock = false); ///< Create a new Unix Socket.
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Connection(int write, int read); ///< Simulate a socket using two file descriptors.
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// copy/assignment constructors
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Connection(const Connection &rhs);
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Connection &operator=(const Connection &rhs);
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// destructor
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~Connection();
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// generic methods
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void open(int sockNo); // Open from existing socket connection.
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void open(std::string hostname, int port, bool nonblock, bool with_ssl = false); // Open TCP connection.
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void open(std::string adres, bool nonblock = false); // Open Unix connection.
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void open(int write, int read); // Open from two existing file descriptors.
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void close(); ///< Close connection.
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void drop(); ///< Close connection without shutdown.
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void setBlocking(bool blocking); ///< Set this socket to be blocking (true) or nonblocking (false).
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bool isBlocking(); ///< Check if this socket is blocking (true) or nonblocking (false).
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std::string getHost() const; ///< Gets hostname for connection, if available.
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std::string getBinHost();
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void setHost(std::string host); ///< Sets hostname for connection manually.
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std::string getBoundAddress() const;
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int getSocket(); ///< Returns internal socket number.
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int getPureSocket(); ///< Returns non-piped internal socket number.
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std::string getError(); ///< Returns a string describing the last error that occured.
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bool connected() const; ///< Returns the connected-state for this socket.
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bool isAddress(const std::string &addr);
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bool isLocal(); ///< Returns true if remote address is a local address.
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// buffered i/o methods
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bool spool(bool strictMode = false); ///< Updates the downbufferinternal variables.
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bool peek(); ///< Clears the downbuffer and fills it with peek
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Buffer &Received(); ///< Returns a reference to the download buffer.
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const Buffer &Received() const; ///< Returns a reference to the download buffer.
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void SendNow(const std::string &data); ///< Will not buffer anything but always send right away. Blocks.
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void SendNow(const char *data); ///< Will not buffer anything but always send right away. Blocks.
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void SendNow(const char *data,
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size_t len); ///< Will not buffer anything but always send right away. Blocks.
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void skipBytes(uint32_t byteCount);
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uint32_t skipCount;
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// unbuffered i/o methods
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unsigned int iwrite(const void *buffer, int len); ///< Incremental write call.
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bool iwrite(std::string &buffer); ///< Write call that is compatible with std::string.
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// stats related methods
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unsigned int connTime(); ///< Returns the time this socket has been connected.
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uint64_t dataUp(); ///< Returns total amount of bytes sent.
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uint64_t dataDown(); ///< Returns total amount of bytes received.
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void resetCounter(); ///< Resets the up/down bytes counter to zero.
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void addUp(const uint32_t i);
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void addDown(const uint32_t i);
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friend class Server;
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bool Error; ///< Set to true if a socket error happened.
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bool Blocking; ///< Set to true if a socket is currently or wants to be blocking.
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// overloaded operators
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bool operator==(const Connection &B) const;
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bool operator!=(const Connection &B) const;
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operator bool() const;
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};
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/// This class is for easily setting up listening socket, either TCP or Unix.
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class Server{
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private:
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std::string errors; ///< Stores errors that may have occured.
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int sock; ///< Internally saved socket number.
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bool IPv6bind(int port, std::string hostname, bool nonblock); ///< Attempt to bind an IPv6 socket
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bool IPv4bind(int port, std::string hostname, bool nonblock); ///< Attempt to bind an IPv4 socket
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public:
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Server(); ///< Create a new base Server.
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Server(int existingSock); ///< Create a new Server from existing socket.
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Server(int port, std::string hostname, bool nonblock = false); ///< Create a new TCP Server.
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Server(std::string adres, bool nonblock = false); ///< Create a new Unix Server.
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Connection accept(bool nonblock = false); ///< Accept any waiting connections.
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void setBlocking(bool blocking); ///< Set this socket to be blocking (true) or nonblocking (false).
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bool connected() const; ///< Returns the connected-state for this socket.
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bool isBlocking(); ///< Check if this socket is blocking (true) or nonblocking (false).
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void close(); ///< Close connection.
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void drop(); ///< Close connection without shutdown.
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int getSocket(); ///< Returns internal socket number.
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};
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class UDPConnection{
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private:
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int sock; ///< Internally saved socket number.
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std::string remotehost; ///< Stores remote host address
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void *destAddr; ///< Destination address pointer.
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unsigned int destAddr_size; ///< Size of the destination address pointer.
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unsigned int up; ///< Amount of bytes transferred up.
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unsigned int down; ///< Amount of bytes transferred down.
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int family; ///< Current socket address family
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std::string boundAddr, boundMulti;
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int boundPort;
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void checkRecvBuf();
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public:
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Util::ResizeablePointer data;
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UDPConnection(const UDPConnection &o);
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UDPConnection(bool nonblock = false);
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~UDPConnection();
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void close();
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int getSock();
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uint16_t bind(int port, std::string iface = "", const std::string &multicastAddress = "");
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void setBlocking(bool blocking);
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void SetDestination(std::string hostname, uint32_t port);
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void GetDestination(std::string &hostname, uint32_t &port);
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std::string getBinDestination();
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const void * getDestAddr(){return destAddr;}
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size_t getDestAddrLen(){return destAddr_size;}
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std::string getBoundAddress();
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uint32_t getDestPort() const;
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bool Receive();
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void SendNow(const std::string &data);
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void SendNow(const char *data);
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void SendNow(const char *data, size_t len);
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void setSocketFamily(int AF_TYPE);
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};
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}// namespace Socket
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