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Diffstat (limited to 'include/ricochet/net/sys/socket.hh')
| -rw-r--r-- | include/ricochet/net/sys/socket.hh | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/include/ricochet/net/sys/socket.hh b/include/ricochet/net/sys/socket.hh new file mode 100644 index 0000000..f84be26 --- /dev/null +++ b/include/ricochet/net/sys/socket.hh @@ -0,0 +1,160 @@ +/** + * --------------------------------------------------------------------------- + * @notice This file was adapted from the Minnow networking framework, + * originally developed for Stanford University's CS144 course. + * It has been incorporated into the Ricochet project as foundational + * system utility code. + * --------------------------------------------------------------------------- + */ + +#pragma once + +#include "address.hh" +#include "file_descriptor.hh" + +#include <functional> +#include <sys/socket.h> + +//! \brief Base class for network sockets (TCP, UDP, etc.) +//! \details Socket is generally used via a subclass. See TCPSocket and UDPSocket for usage examples. +class Socket : public FileDescriptor +{ +public: + //! Bind a socket to a specified address with [bind(2)](\ref man2::bind), usually for listen/accept + void bind( const Address& address ); + + //! Bind a socket to a specified device + void bind_to_device( std::string_view device_name ); + + //! Connect a socket to a specified peer address with [connect(2)](\ref man2::connect) + void connect( const Address& address ); + + //! Shut down a socket via [shutdown(2)](\ref man2::shutdown) + void shutdown( int how ); + + //! Get local address of socket with [getsockname(2)](\ref man2::getsockname) + Address local_address() const; + //! Get peer address of socket with [getpeername(2)](\ref man2::getpeername) + Address peer_address() const; + + //! Allow local address to be reused sooner via [SO_REUSEADDR](\ref man7::socket) + void set_reuseaddr(); + + //! Check for errors (will be seen on non-blocking sockets) + void throw_if_error() const; + +private: + //! Get the local or peer address the socket is connected to + Address get_address( const std::string& name_of_function, + const std::function<int( int, sockaddr*, socklen_t* )>& function ) const; + +protected: + //! Construct via [socket(2)](\ref man2::socket) + Socket( int domain, int type, int protocol = 0 ); + + //! Construct from a file descriptor. + Socket( FileDescriptor&& fd, int domain, int type, int protocol = 0 ); + + //! Wrapper around [getsockopt(2)](\ref man2::getsockopt) + template<typename option_type> + socklen_t getsockopt( int level, int option, option_type& option_value ) const; + + //! Wrappers around [setsockopt(2)](\ref man2::setsockopt) + template<typename option_type> + void setsockopt( int level, int option, const option_type& option_value ); + + void setsockopt( int level, int option, std::string_view option_val ); +}; + +class DatagramSocket : public Socket +{ +public: + // Receive a datagram and the Address of its sender, into a buffer or collection of buffers. + void recv( Address& source_address, std::string& payload ); + void recv( Address& source_address, std::vector<std::string>& payloads ); + + //! Send a datagram to specified Address (if destination is missing, sends to already-connected address) + void send( std::string_view payload, const std::optional<Address>& destination = {} ); + void send( const StringViewRange auto&& payloads, const std::optional<Address>& destination = {} ) + { + static thread_local std::vector<iovec> iovecs; + const size_t total_size = to_iovecs( payloads, iovecs ); + send( iovecs, total_size, destination ); + } + +private: + void send( std::vector<iovec>& iovecs, size_t total_size, const std::optional<Address>& destination = {} ); + +protected: + DatagramSocket( int domain, int type, int protocol = 0 ) : Socket( domain, type, protocol ) {} + + //! Construct from a file descriptor. + DatagramSocket( FileDescriptor&& fd, int domain, int type, int protocol = 0 ) + : Socket( std::move( fd ), domain, type, protocol ) + {} +}; + +//! A wrapper around [UDP sockets](\ref man7::udp) +class UDPSocket : public DatagramSocket +{ + //! \param[in] fd is the FileDescriptor from which to construct + explicit UDPSocket( FileDescriptor&& fd ) : DatagramSocket( std::move( fd ), AF_INET, SOCK_DGRAM ) {} + +public: + //! Default: construct an unbound, unconnected UDP socket + UDPSocket() : DatagramSocket( AF_INET, SOCK_DGRAM ) {} +}; + +//! A wrapper around [TCP sockets](\ref man7::tcp) +class TCPSocket : public Socket +{ +private: + //! \brief Construct from FileDescriptor (used by accept()) + //! \param[in] fd is the FileDescriptor from which to construct + explicit TCPSocket( FileDescriptor&& fd ) : Socket( std::move( fd ), AF_INET, SOCK_STREAM, IPPROTO_TCP ) {} + +public: + //! Default: construct an unbound, unconnected TCP socket + TCPSocket() : Socket( AF_INET, SOCK_STREAM ) {} + + //! Mark a socket as listening for incoming connections + void listen( int backlog = 16 ); + + //! Accept a new incoming connection + TCPSocket accept(); +}; + +//! A wrapper around [packet sockets](\ref man7:packet) +class PacketSocket : public DatagramSocket +{ +public: + PacketSocket( const int type, const int protocol ) : DatagramSocket( AF_PACKET, type, protocol ) {} + + void set_promiscuous(); +}; + +//! A wrapper around [raw sockets](\ref man7:raw) +class RawSocket : public DatagramSocket +{ +public: + RawSocket() : DatagramSocket( AF_INET, SOCK_RAW, IPPROTO_RAW ) {} +}; + +//! A wrapper around [Unix-domain stream sockets](\ref man7::unix) +class LocalStreamSocket : public Socket +{ +public: + //! Construct from a file descriptor + explicit LocalStreamSocket( FileDescriptor&& fd ) : Socket( std::move( fd ), AF_UNIX, SOCK_STREAM ) {} +}; + +//! A wrapper around [Unix-domain datagram sockets](\ref man7::unix) +class LocalDatagramSocket : public DatagramSocket +{ + //! \param[in] fd is the FileDescriptor from which to construct + explicit LocalDatagramSocket( FileDescriptor&& fd ) : DatagramSocket( std::move( fd ), AF_UNIX, SOCK_DGRAM ) {} + +public: + //! Default: construct an unbound, unconnected socket + LocalDatagramSocket() : DatagramSocket( AF_UNIX, SOCK_DGRAM ) {} +}; |
