transmission/libtransmission/net.h

157 lines
4.7 KiB
C

/******************************************************************************
* Copyright (c) Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#pragma once
#ifndef __TRANSMISSION__
#error only libtransmission should #include this header.
#endif
#ifdef _WIN32
#include <inttypes.h>
#include <ws2tcpip.h>
#else
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#endif
#ifdef _WIN32
typedef SOCKET tr_socket_t;
#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. */
typedef int tr_socket_t;
/** @brief Platform-specific invalid socket descriptor constant. */
#define TR_BAD_SOCKET (-1)
#define sockerrno errno
#endif
/****
*****
***** tr_address
*****
****/
typedef enum tr_address_type
{
TR_AF_INET,
TR_AF_INET6,
NUM_TR_AF_INET_TYPES
}
tr_address_type;
typedef struct tr_address
{
tr_address_type type;
union
{
struct in6_addr addr6;
struct in_addr addr4;
}
addr;
}
tr_address;
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);
bool tr_address_from_string(tr_address* setme, char const* string);
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);
static inline bool tr_address_is_valid(tr_address const* a)
{
return a != NULL && (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;
struct tr_peer_socket tr_netOpenPeerSocket(tr_session* session, tr_address const* addr, tr_port port, bool clientIsSeed);
struct tr_peer_socket tr_netOpenPeerUTPSocket(tr_session* session, tr_address const* addr, tr_port port, bool clientIsSeed);
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(void);