3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
29 #include "util/string.h"
30 #include "util/numeric.h"
31 #include "constants.h"
37 #ifndef WIN32_LEAN_AND_MEAN
38 #define WIN32_LEAN_AND_MEAN
40 // Without this some of the network functions are not found on mingw
42 #define _WIN32_WINNT 0x0501
47 #define LAST_SOCKET_ERR() WSAGetLastError()
48 typedef SOCKET socket_t;
49 typedef int socklen_t;
51 #include <sys/types.h>
52 #include <sys/socket.h>
53 #include <netinet/in.h>
57 #include <arpa/inet.h>
58 #define LAST_SOCKET_ERR() (errno)
62 // Set to true to enable verbose debug output
63 bool socket_enable_debug_output = false; // yuck
65 static bool g_sockets_initialized = false;
71 // Windows needs sockets to be initialized before use
73 if(WSAStartup( MAKEWORD(2,2), &WsaData ) != NO_ERROR)
74 throw SocketException("WSAStartup failed");
76 g_sockets_initialized = true;
79 void sockets_cleanup()
82 // On Windows, cleanup sockets after use
94 memset(&m_address, 0, sizeof(m_address));
98 Address::Address(u32 address, u16 port)
100 memset(&m_address, 0, sizeof(m_address));
105 Address::Address(u8 a, u8 b, u8 c, u8 d, u16 port)
107 memset(&m_address, 0, sizeof(m_address));
108 setAddress(a, b, c, d);
112 Address::Address(const IPv6AddressBytes *ipv6_bytes, u16 port)
114 memset(&m_address, 0, sizeof(m_address));
115 setAddress(ipv6_bytes);
119 // Equality (address family, address and port must be equal)
120 bool Address::operator==(const Address &address)
122 if(address.m_addr_family != m_addr_family || address.m_port != m_port)
124 else if(m_addr_family == AF_INET)
126 return m_address.ipv4.sin_addr.s_addr ==
127 address.m_address.ipv4.sin_addr.s_addr;
129 else if(m_addr_family == AF_INET6)
131 return memcmp(m_address.ipv6.sin6_addr.s6_addr,
132 address.m_address.ipv6.sin6_addr.s6_addr, 16) == 0;
138 bool Address::operator!=(const Address &address)
140 return !(*this == address);
143 void Address::Resolve(const char *name)
145 if (!name || name[0] == 0) {
146 if (m_addr_family == AF_INET) {
148 } else if (m_addr_family == AF_INET6) {
149 setAddress((IPv6AddressBytes*) 0);
154 struct addrinfo *resolved, hints;
155 memset(&hints, 0, sizeof(hints));
158 hints.ai_socktype = 0;
159 hints.ai_protocol = 0;
161 if(g_settings->getBool("enable_ipv6"))
163 // AF_UNSPEC allows both IPv6 and IPv4 addresses to be returned
164 hints.ai_family = AF_UNSPEC;
168 hints.ai_family = AF_INET;
172 int e = getaddrinfo(name, NULL, &hints, &resolved);
174 throw ResolveError(gai_strerror(e));
177 if(resolved->ai_family == AF_INET)
179 struct sockaddr_in *t = (struct sockaddr_in *) resolved->ai_addr;
180 m_addr_family = AF_INET;
183 else if(resolved->ai_family == AF_INET6)
185 struct sockaddr_in6 *t = (struct sockaddr_in6 *) resolved->ai_addr;
186 m_addr_family = AF_INET6;
191 freeaddrinfo(resolved);
192 throw ResolveError("");
194 freeaddrinfo(resolved);
197 // IP address -> textual representation
198 std::string Address::serializeString() const
200 // windows XP doesnt have inet_ntop, maybe use better func
202 if(m_addr_family == AF_INET)
206 addr = ntohl(m_address.ipv4.sin_addr.s_addr);
207 a = (addr & 0xFF000000) >> 24;
208 b = (addr & 0x00FF0000) >> 16;
209 c = (addr & 0x0000FF00) >> 8;
210 d = (addr & 0x000000FF);
211 return itos(a) + "." + itos(b) + "." + itos(c) + "." + itos(d);
213 else if(m_addr_family == AF_INET6)
215 std::ostringstream os;
216 for(int i = 0; i < 16; i += 2)
219 (m_address.ipv6.sin6_addr.s6_addr[i] << 8) |
220 (m_address.ipv6.sin6_addr.s6_addr[i + 1]);
221 os << std::hex << section;
228 return std::string("");
230 char str[INET6_ADDRSTRLEN];
231 if (inet_ntop(m_addr_family, (m_addr_family == AF_INET) ? (void*)&(m_address.ipv4.sin_addr) : (void*)&(m_address.ipv6.sin6_addr), str, INET6_ADDRSTRLEN) == NULL) {
232 return std::string("");
234 return std::string(str);
238 struct sockaddr_in Address::getAddress() const
240 return m_address.ipv4; // NOTE: NO PORT INCLUDED, use getPort()
243 struct sockaddr_in6 Address::getAddress6() const
245 return m_address.ipv6; // NOTE: NO PORT INCLUDED, use getPort()
248 u16 Address::getPort() const
253 int Address::getFamily() const
255 return m_addr_family;
258 bool Address::isIPv6() const
260 return m_addr_family == AF_INET6;
263 bool Address::isZero() const
265 if (m_addr_family == AF_INET) {
266 return m_address.ipv4.sin_addr.s_addr == 0;
267 } else if (m_addr_family == AF_INET6) {
268 static const char zero[16] = {0};
269 return memcmp(m_address.ipv6.sin6_addr.s6_addr,
275 void Address::setAddress(u32 address)
277 m_addr_family = AF_INET;
278 m_address.ipv4.sin_family = AF_INET;
279 m_address.ipv4.sin_addr.s_addr = htonl(address);
282 void Address::setAddress(u8 a, u8 b, u8 c, u8 d)
284 m_addr_family = AF_INET;
285 m_address.ipv4.sin_family = AF_INET;
286 u32 addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
287 m_address.ipv4.sin_addr.s_addr = addr;
290 void Address::setAddress(const IPv6AddressBytes *ipv6_bytes)
292 m_addr_family = AF_INET6;
293 m_address.ipv6.sin6_family = AF_INET6;
295 memcpy(m_address.ipv6.sin6_addr.s6_addr, ipv6_bytes->bytes, 16);
297 memset(m_address.ipv6.sin6_addr.s6_addr, 0, 16);
300 void Address::setPort(u16 port)
305 void Address::print(std::ostream *s) const
307 if(m_addr_family == AF_INET6)
308 *s << "[" << serializeString() << "]:" << m_port;
310 *s << serializeString() << ":" << m_port;
317 UDPSocket::UDPSocket(bool ipv6)
322 bool UDPSocket::init(bool ipv6, bool noExceptions)
324 if (g_sockets_initialized == false) {
325 dstream << "Sockets not initialized" << std::endl;
329 // Use IPv6 if specified
330 m_addr_family = ipv6 ? AF_INET6 : AF_INET;
331 m_handle = socket(m_addr_family, SOCK_DGRAM, IPPROTO_UDP);
333 if (socket_enable_debug_output) {
334 dstream << "UDPSocket(" << (int) m_handle
335 << ")::UDPSocket(): ipv6 = "
336 << (ipv6 ? "true" : "false")
344 throw SocketException(std::string("Failed to create socket: error ")
345 + itos(LAST_SOCKET_ERR()));
355 UDPSocket::~UDPSocket()
357 if (socket_enable_debug_output) {
358 dstream << "UDPSocket( " << (int) m_handle << ")::~UDPSocket()"
363 closesocket(m_handle);
369 void UDPSocket::Bind(Address addr)
371 if(socket_enable_debug_output) {
372 dstream << "UDPSocket(" << (int) m_handle << ")::Bind(): "
373 << addr.serializeString() << ":"
374 << addr.getPort() << std::endl;
377 if (addr.getFamily() != m_addr_family) {
378 static const char *errmsg = "Socket and bind address families do not match";
379 errorstream << "Bind failed: " << errmsg << std::endl;
380 throw SocketException(errmsg);
383 if(m_addr_family == AF_INET6) {
384 struct sockaddr_in6 address;
385 memset(&address, 0, sizeof(address));
387 address = addr.getAddress6();
388 address.sin6_family = AF_INET6;
389 address.sin6_port = htons(addr.getPort());
391 if(bind(m_handle, (const struct sockaddr *) &address,
392 sizeof(struct sockaddr_in6)) < 0) {
393 dstream << (int) m_handle << ": Bind failed: "
394 << strerror(errno) << std::endl;
395 throw SocketException("Failed to bind socket");
398 struct sockaddr_in address;
399 memset(&address, 0, sizeof(address));
401 address = addr.getAddress();
402 address.sin_family = AF_INET;
403 address.sin_port = htons(addr.getPort());
405 if (bind(m_handle, (const struct sockaddr *) &address,
406 sizeof(struct sockaddr_in)) < 0) {
407 dstream << (int)m_handle << ": Bind failed: "
408 << strerror(errno) << std::endl;
409 throw SocketException("Failed to bind socket");
414 void UDPSocket::Send(const Address & destination, const void * data, int size)
416 bool dumping_packet = false; // for INTERNET_SIMULATOR
418 if(INTERNET_SIMULATOR)
419 dumping_packet = myrand() % INTERNET_SIMULATOR_PACKET_LOSS == 0;
421 if(socket_enable_debug_output) {
422 // Print packet destination and size
423 dstream << (int)m_handle << " -> ";
424 destination.print(&dstream);
425 dstream << ", size=" << size;
427 // Print packet contents
428 dstream << ", data=";
429 for(int i = 0; i < size && i < 20; i++) {
432 unsigned int a = ((const unsigned char *)data)[i];
433 dstream << std::hex << std::setw(2) << std::setfill('0') << a;
440 dstream << " (DUMPED BY INTERNET_SIMULATOR)";
442 dstream << std::endl;
446 // Lol let's forget it
447 dstream << "UDPSocket::Send(): INTERNET_SIMULATOR: dumping packet."
452 if(destination.getFamily() != m_addr_family)
453 throw SendFailedException("Address family mismatch");
456 if(m_addr_family == AF_INET6) {
457 struct sockaddr_in6 address = destination.getAddress6();
458 address.sin6_port = htons(destination.getPort());
459 sent = sendto(m_handle, (const char *)data, size,
460 0, (struct sockaddr *)&address, sizeof(struct sockaddr_in6));
462 struct sockaddr_in address = destination.getAddress();
463 address.sin_port = htons(destination.getPort());
464 sent = sendto(m_handle, (const char *)data, size,
465 0, (struct sockaddr *)&address, sizeof(struct sockaddr_in));
469 throw SendFailedException("Failed to send packet");
472 int UDPSocket::Receive(Address & sender, void *data, int size)
475 if(WaitData(m_timeout_ms) == false)
479 if (m_addr_family == AF_INET6) {
480 struct sockaddr_in6 address;
481 memset(&address, 0, sizeof(address));
482 socklen_t address_len = sizeof(address);
484 received = recvfrom(m_handle, (char *) data,
485 size, 0, (struct sockaddr *) &address, &address_len);
490 u16 address_port = ntohs(address.sin6_port);
491 IPv6AddressBytes bytes;
492 memcpy(bytes.bytes, address.sin6_addr.s6_addr, 16);
493 sender = Address(&bytes, address_port);
495 struct sockaddr_in address;
496 memset(&address, 0, sizeof(address));
498 socklen_t address_len = sizeof(address);
500 received = recvfrom(m_handle, (char *)data,
501 size, 0, (struct sockaddr *)&address, &address_len);
506 u32 address_ip = ntohl(address.sin_addr.s_addr);
507 u16 address_port = ntohs(address.sin_port);
509 sender = Address(address_ip, address_port);
512 if (socket_enable_debug_output) {
513 // Print packet sender and size
514 dstream << (int) m_handle << " <- ";
515 sender.print(&dstream);
516 dstream << ", size=" << received;
518 // Print packet contents
519 dstream << ", data=";
520 for(int i = 0; i < received && i < 20; i++) {
523 unsigned int a = ((const unsigned char *) data)[i];
524 dstream << std::hex << std::setw(2) << std::setfill('0') << a;
529 dstream << std::endl;
535 int UDPSocket::GetHandle()
540 void UDPSocket::setTimeoutMs(int timeout_ms)
542 m_timeout_ms = timeout_ms;
545 bool UDPSocket::WaitData(int timeout_ms)
550 // Initialize the set
552 FD_SET(m_handle, &readset);
554 // Initialize time out struct
557 tv.tv_usec = timeout_ms * 1000;
560 result = select(m_handle+1, &readset, NULL, NULL, &tv);
564 else if (result < 0 && (errno == EINTR || errno == EBADF)) {
565 // N.B. select() fails when sockets are destroyed on Connection's dtor
566 // with EBADF. Instead of doing tricky synchronization, allow this
567 // thread to exit but don't throw an exception.
569 } else if (result < 0) {
570 dstream << (int) m_handle << ": Select failed: "
571 << strerror(errno) << std::endl;
574 int e = WSAGetLastError();
575 dstream << (int) m_handle << ": WSAGetLastError()="
577 if (e == 10004 /* WSAEINTR */ || e == 10009 /* WSAEBADF */) {
578 infostream << "Ignoring WSAEINTR/WSAEBADF." << std::endl;
583 throw SocketException("Select failed");
584 } else if(FD_ISSET(m_handle, &readset) == false) {