1/* Copyright (c) 2013-2014 Jeffrey Pfau
  2 *
  3 * This Source Code Form is subject to the terms of the Mozilla Public
  4 * License, v. 2.0. If a copy of the MPL was not distributed with this
  5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
  6#ifndef SOCKET_H
  7#define SOCKET_H
  8
  9#include "util/common.h"
 10
 11#ifdef __cplusplus
 12#define restrict __restrict__
 13#endif
 14
 15#ifdef _WIN32
 16#include <winsock2.h>
 17#include <ws2tcpip.h>
 18
 19#define SOCKET_FAILED(s) ((s) == INVALID_SOCKET)
 20typedef SOCKET Socket;
 21#else
 22#include <errno.h>
 23#include <fcntl.h>
 24#include <netinet/in.h>
 25#include <netinet/tcp.h>
 26#include <sys/select.h>
 27#include <sys/socket.h>
 28
 29#define INVALID_SOCKET (-1)
 30#define SOCKET_FAILED(s) ((s) < 0)
 31typedef int Socket;
 32#endif
 33
 34enum IP {
 35	IPV4,
 36	IPV6
 37};
 38
 39struct Address {
 40	enum IP version;
 41	union {
 42		uint32_t ipv4;
 43		uint8_t ipv6[16];
 44	};
 45};
 46
 47static inline void SocketSubsystemInit() {
 48#ifdef _WIN32
 49	WSADATA data;
 50	WSAStartup(MAKEWORD(2, 2), &data);
 51#endif
 52}
 53
 54static inline int SocketError() {
 55#ifdef _WIN32
 56	return WSAGetLastError();
 57#else
 58	return errno;
 59#endif
 60}
 61
 62static inline bool SocketWouldBlock() {
 63#ifdef _WIN32
 64	return SocketError() == WSAEWOULDBLOCK;
 65#else
 66	return SocketError() == EWOULDBLOCK || SocketError() == EAGAIN;
 67#endif
 68}
 69
 70static inline ssize_t SocketSend(Socket socket, const void* buffer, size_t size) {
 71#ifdef _WIN32
 72	return send(socket, (const char*) buffer, size, 0);
 73#else
 74	return write(socket, buffer, size);
 75#endif
 76}
 77
 78static inline ssize_t SocketRecv(Socket socket, void* buffer, size_t size) {
 79#ifdef _WIN32
 80	return recv(socket, (char*) buffer, size, 0);
 81#else
 82	return read(socket, buffer, size);
 83#endif
 84}
 85
 86static inline Socket SocketOpenTCP(int port, const struct Address* bindAddress) {
 87	Socket sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 88	if (SOCKET_FAILED(sock)) {
 89		return sock;
 90	}
 91
 92	int err;
 93	if (!bindAddress) {
 94		struct sockaddr_in bindInfo;
 95		memset(&bindInfo, 0, sizeof(bindInfo));
 96		bindInfo.sin_family = AF_INET;
 97		bindInfo.sin_port = htons(port);
 98		err = bind(sock, (const struct sockaddr*) &bindInfo, sizeof(bindInfo));
 99	} else if (bindAddress->version == IPV4) {
100		struct sockaddr_in bindInfo;
101		memset(&bindInfo, 0, sizeof(bindInfo));
102		bindInfo.sin_family = AF_INET;
103		bindInfo.sin_port = htons(port);
104		bindInfo.sin_addr.s_addr = bindAddress->ipv4;
105		err = bind(sock, (const struct sockaddr*) &bindInfo, sizeof(bindInfo));
106	} else {
107		struct sockaddr_in6 bindInfo;
108		memset(&bindInfo, 0, sizeof(bindInfo));
109		bindInfo.sin6_family = AF_INET6;
110		bindInfo.sin6_port = htons(port);
111		memcpy(bindInfo.sin6_addr.s6_addr, bindAddress->ipv6, sizeof(bindInfo.sin6_addr.s6_addr));
112		err = bind(sock, (const struct sockaddr*) &bindInfo, sizeof(bindInfo));
113
114	}
115	if (err) {
116		close(sock);
117		return INVALID_SOCKET;
118	}
119	return sock;
120}
121
122static inline Socket SocketConnectTCP(int port, const struct Address* destinationAddress) {
123	Socket sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
124	if (SOCKET_FAILED(sock)) {
125		return sock;
126	}
127
128	int err;
129	if (!destinationAddress) {
130		struct sockaddr_in bindInfo;
131		memset(&bindInfo, 0, sizeof(bindInfo));
132		bindInfo.sin_family = AF_INET;
133		bindInfo.sin_port = htons(port);
134		err = connect(sock, (const struct sockaddr*) &bindInfo, sizeof(bindInfo));
135	} else if (destinationAddress->version == IPV4) {
136		struct sockaddr_in bindInfo;
137		memset(&bindInfo, 0, sizeof(bindInfo));
138		bindInfo.sin_family = AF_INET;
139		bindInfo.sin_port = htons(port);
140		bindInfo.sin_addr.s_addr = destinationAddress->ipv4;
141		err = connect(sock, (const struct sockaddr*) &bindInfo, sizeof(bindInfo));
142	} else {
143		struct sockaddr_in6 bindInfo;
144		memset(&bindInfo, 0, sizeof(bindInfo));
145		bindInfo.sin6_family = AF_INET6;
146		bindInfo.sin6_port = htons(port);
147		memcpy(bindInfo.sin6_addr.s6_addr, destinationAddress->ipv6, sizeof(bindInfo.sin6_addr.s6_addr));
148		err = connect(sock, (const struct sockaddr*) &bindInfo, sizeof(bindInfo));
149	}
150
151	if (err) {
152		close(sock);
153		return INVALID_SOCKET;
154	}
155	return sock;
156}
157
158static inline Socket SocketListen(Socket socket, int queueLength) {
159	return listen(socket, queueLength);
160}
161
162static inline Socket SocketAccept(Socket socket, struct Address* address) {
163	if (!address) {
164		return accept(socket, 0, 0);
165	}
166	if (address->version == IPV4) {
167		struct sockaddr_in addrInfo;
168		memset(&addrInfo, 0, sizeof(addrInfo));
169		addrInfo.sin_family = AF_INET;
170		addrInfo.sin_addr.s_addr = address->ipv4;
171		socklen_t len = sizeof(addrInfo);
172		return accept(socket, (struct sockaddr*) &addrInfo, &len);
173	} else {
174		struct sockaddr_in6 addrInfo;
175		memset(&addrInfo, 0, sizeof(addrInfo));
176		addrInfo.sin6_family = AF_INET6;
177		memcpy(addrInfo.sin6_addr.s6_addr, address->ipv6, sizeof(addrInfo.sin6_addr.s6_addr));
178		socklen_t len = sizeof(addrInfo);
179		return accept(socket, (struct sockaddr*) &addrInfo, &len);
180	}
181}
182
183static inline int SocketClose(Socket socket) {
184	return close(socket) >= 0;
185}
186
187static inline int SocketSetBlocking(Socket socket, bool blocking) {
188#ifdef _WIN32
189	u_long unblocking = !blocking;
190	return ioctlsocket(socket, FIONBIO, &unblocking) == NO_ERROR;
191#else
192	int flags = fcntl(socket, F_GETFL);
193	if (flags == -1) {
194		return 0;
195	}
196	if (blocking) {
197		flags &= ~O_NONBLOCK;
198	} else {
199		flags |= O_NONBLOCK;
200	}
201	return fcntl(socket, F_SETFL, flags) >= 0;
202#endif
203}
204
205static inline int SocketSetTCPPush(Socket socket, int push) {
206	return setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*) &push, sizeof(int)) >= 0;
207}
208
209static inline int SocketPoll(size_t nSockets, Socket* reads, Socket* writes, Socket* errors, int64_t timeoutMillis) {
210	fd_set rset;
211	fd_set wset;
212	fd_set eset;
213	FD_ZERO(&rset);
214	FD_ZERO(&wset);
215	FD_ZERO(&eset);
216	size_t i;
217	Socket maxFd = 0;
218	if (reads) {
219		for (i = 0; i < nSockets; ++i) {
220			if (SOCKET_FAILED(reads[i])) {
221				break;
222			}
223			if (reads[i] > maxFd) {
224				maxFd = reads[i];
225			}
226			FD_SET(reads[i], &rset);
227			reads[i] = INVALID_SOCKET;
228		}
229	}
230	if (writes) {
231		for (i = 0; i < nSockets; ++i) {
232			if (SOCKET_FAILED(writes[i])) {
233				break;
234			}
235			if (writes[i] > maxFd) {
236				maxFd = writes[i];
237			}
238			FD_SET(writes[i], &wset);
239			writes[i] = INVALID_SOCKET;
240		}
241	}
242	if (errors) {
243		for (i = 0; i < nSockets; ++i) {
244			if (SOCKET_FAILED(errors[i])) {
245				break;
246			}
247			if (errors[i] > maxFd) {
248				maxFd = errors[i];
249			}
250			FD_SET(errors[i], &eset);
251			errors[i] = INVALID_SOCKET;
252		}
253	}
254	struct timeval tv;
255	tv.tv_sec = timeoutMillis / 1000;
256	tv.tv_usec = (timeoutMillis % 1000) * 1000;
257	int result = select(maxFd + 1, &rset, &wset, &eset, timeoutMillis < 0 ? 0 : &tv);
258	int r = 0;
259	int w = 0;
260	int e = 0;
261	Socket j;
262	for (j = 0; j < maxFd; ++j) {
263		if (reads && FD_ISSET(j, &rset)) {
264			reads[r] = j;
265			++r;
266		}
267		if (writes && FD_ISSET(j, &wset)) {
268			writes[w] = j;
269			++w;
270		}
271		if (errors && FD_ISSET(j, &eset)) {
272			errors[e] = j;
273			++e;
274		}
275	}
276	return result;
277}
278
279#endif