transmission/libtransmission/net.h

139 lines
3.6 KiB
C++

// Copyright © Transmission authors and contributors.
// This file is licensed under the MIT (SPDX: MIT) license,
// A copy of this license can be found in licenses/ .
#pragma once
#ifndef __TRANSMISSION__
#error only libtransmission should #include this header.
#endif
#include <cstddef> // size_t
#include <string_view>
#ifdef _WIN32
#include <inttypes.h>
#include <ws2tcpip.h>
#else
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#endif
#ifdef _WIN32
using tr_socket_t = SOCKET;
#define TR_BAD_SOCKET INVALID_SOCKET
#undef EADDRINUSE
#define EADDRINUSE WSAEADDRINUSE
#undef ECONNREFUSED
#define ECONNREFUSED WSAECONNREFUSED
#undef ECONNRESET
#define ECONNRESET WSAECONNRESET
#undef EHOSTUNREACH
#define EHOSTUNREACH WSAEHOSTUNREACH
#undef EINPROGRESS
#define EINPROGRESS WSAEINPROGRESS
#undef ENOTCONN
#define ENOTCONN WSAENOTCONN
#undef EWOULDBLOCK
#define EWOULDBLOCK WSAEWOULDBLOCK
#undef EAFNOSUPPORT
#define EAFNOSUPPORT WSAEAFNOSUPPORT
#undef ENETUNREACH
#define ENETUNREACH WSAENETUNREACH
#define sockerrno WSAGetLastError()
#else
/** @brief Platform-specific socket descriptor type. */
using tr_socket_t = int;
/** @brief Platform-specific invalid socket descriptor constant. */
#define TR_BAD_SOCKET (-1)
#define sockerrno errno
#endif
/****
*****
***** tr_address
*****
****/
enum tr_address_type
{
TR_AF_INET,
TR_AF_INET6,
NUM_TR_AF_INET_TYPES
};
struct tr_address
{
tr_address_type type;
union
{
struct in6_addr addr6;
struct in_addr addr4;
} addr;
};
extern tr_address const tr_inaddr_any;
extern tr_address const tr_in6addr_any;
char const* tr_address_to_string(tr_address const* addr);
char const* tr_address_to_string_with_buf(tr_address const* addr, char* buf, size_t buflen);
char const* tr_address_and_port_to_string(char* buf, size_t buflen, tr_address const* addr, tr_port port);
bool tr_address_from_string(tr_address* setme, char const* string);
bool tr_address_from_string(tr_address* dst, std::string_view src);
bool tr_address_from_sockaddr_storage(tr_address* setme, tr_port* port, struct sockaddr_storage const* src);
int tr_address_compare(tr_address const* a, tr_address const* b);
bool tr_address_is_valid_for_peers(tr_address const* addr, tr_port port);
constexpr bool tr_address_is_valid(tr_address const* a)
{
return a != nullptr && (a->type == TR_AF_INET || a->type == TR_AF_INET6);
}
/***********************************************************************
* Sockets
**********************************************************************/
/* https://en.wikipedia.org/wiki/Differentiated_services#Class_Selector */
enum
{
TR_IPTOS_LOWCOST = 0x38, /* AF13: low prio, high drop */
TR_IPTOS_LOWDELAY = 0x70, /* AF32: high prio, mid drop */
TR_IPTOS_THRUPUT = 0x20, /* CS1: low prio, undef drop */
TR_IPTOS_RELIABLE = 0x28 /* AF11: low prio, low drop */
};
struct tr_session;
tr_socket_t tr_netBindTCP(tr_address const* addr, tr_port port, bool suppressMsgs);
tr_socket_t tr_netAccept(tr_session* session, tr_socket_t bound, tr_address* setme_addr, tr_port* setme_port);
void tr_netSetTOS(tr_socket_t s, int tos, tr_address_type type);
void tr_netSetCongestionControl(tr_socket_t s, char const* algorithm);
void tr_netClose(tr_session* session, tr_socket_t s);
void tr_netCloseSocket(tr_socket_t fd);
bool tr_net_hasIPv6(tr_port);
/**
* @brief get a human-representable string representing the network error.
* @param err an errno on Unix/Linux and an WSAError on win32)
*/
char* tr_net_strerror(char* buf, size_t buflen, int err);
unsigned char const* tr_globalIPv6(tr_session const* session);