2 simgear::Socket, adapted from PLIB Socket by James Turner
3 Copyright (C) 2010 James Turner
5 PLIB - A Suite of Portable Game Libraries
6 Copyright (C) 1998,2002 Steve Baker
8 This library is free software; you can redistribute it and/or
9 modify it under the terms of the GNU Library General Public
10 License as published by the Free Software Foundation; either
11 version 2 of the License, or (at your option) any later version.
13 This library is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Library General Public License for more details.
18 You should have received a copy of the GNU Library General Public
19 License along with this library; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 # include <simgear_config.h>
27 #include <simgear/compiler.h>
28 #include "raw_socket.hxx"
30 #if defined(_WIN32) && !defined(__CYGWIN__)
31 # define WINSOCK // use winsock convetions, otherwise standard POSIX
38 #include <cstdio> // for snprintf
42 # include <winsock2.h>
43 # include <ws2tcpip.h>
46 # include <sys/types.h>
47 # include <sys/socket.h>
48 # include <netinet/in.h>
49 # include <arpa/inet.h>
50 # include <sys/time.h>
56 #if defined(_MSC_VER) && !defined(socklen_t)
60 #include <simgear/debug/logstream.hxx>
61 #include <simgear/structure/exception.hxx>
66 IPAddress::IPAddress ( const char* host, int port )
71 IPAddress::IPAddress( const IPAddress& other ) :
75 addr = (struct sockaddr_in*) malloc(sizeof(struct sockaddr_in));
76 memcpy(addr, other.addr, sizeof(struct sockaddr_in));
80 const IPAddress& IPAddress::operator=(const IPAddress& other)
88 addr = (struct sockaddr_in*) malloc(sizeof(struct sockaddr_in));
89 memcpy(addr, other.addr, sizeof(struct sockaddr_in));
95 void IPAddress::set ( const char* host, int port )
97 addr = (struct sockaddr_in*) malloc(sizeof(struct sockaddr_in));
98 memset(addr, 0, sizeof(struct sockaddr_in));
100 addr->sin_family = AF_INET ;
101 addr->sin_port = htons (port);
103 /* Convert a string specifying a host name or one of a few symbolic
104 ** names to a numeric IP address. This usually calls getaddrinfo()
105 ** to do the work; the names "" and "<broadcast>" are special.
108 if (!host || host[0] == '\0') {
109 addr->sin_addr.s_addr = INADDR_ANY;
113 if (strcmp(host, "<broadcast>") == 0) {
114 addr->sin_addr.s_addr = INADDR_BROADCAST;
118 struct addrinfo hints;
119 memset(&hints, 0, sizeof(struct addrinfo));
120 hints.ai_family = AF_INET;
122 struct addrinfo* result = NULL;
123 int err = getaddrinfo(host, NULL, NULL /* no hints */, &result);
125 SG_LOG(SG_IO, SG_WARN, "getaddrinfo failed for '" << host << "' : " << gai_strerror(err));
126 } else if (result->ai_addrlen != getAddrLen()) {
127 SG_LOG(SG_IO, SG_ALERT, "mismatch in socket address sizes: got " <<
128 result->ai_addrlen << ", expected " << getAddrLen());
129 SG_LOG(SG_IO, SG_ALERT, "family:" << result->ai_family);
131 memcpy(addr, result->ai_addr, result->ai_addrlen);
134 freeaddrinfo(result);
135 addr->sin_port = htons (port); // fix up port after getaddrinfo
138 IPAddress::~IPAddress()
145 /* Create a string object representing an IP address.
146 This is always a string of the form 'dd.dd.dd.dd' (with variable
149 const char* IPAddress::getHost () const
151 static char buf [32];
152 long x = ntohl(addr->sin_addr.s_addr);
153 sprintf(buf, "%d.%d.%d.%d",
154 (int) (x>>24) & 0xff, (int) (x>>16) & 0xff,
155 (int) (x>> 8) & 0xff, (int) (x>> 0) & 0xff );
159 unsigned int IPAddress::getIP () const
161 return addr->sin_addr.s_addr;
164 unsigned int IPAddress::getPort() const
166 return ntohs(addr->sin_port);
169 unsigned int IPAddress::getFamily () const
171 return addr->sin_family;
174 const char* IPAddress::getLocalHost ()
176 //gethostbyname(gethostname())
179 memset(buf, 0, sizeof(buf));
180 gethostname(buf, sizeof(buf)-1);
181 const hostent *hp = gethostbyname(buf);
183 if (hp && *hp->h_addr_list)
185 in_addr addr = *((in_addr*)*hp->h_addr_list);
186 const char* host = inet_ntoa(addr);
196 bool IPAddress::getBroadcast () const
198 return (addr->sin_addr.s_addr == INADDR_BROADCAST);
201 unsigned int IPAddress::getAddrLen() const
203 return sizeof(struct sockaddr_in);
206 struct sockaddr* IPAddress::getAddr() const
208 return (struct sockaddr*) addr;
223 void Socket::setHandle (int _handle)
230 bool Socket::open ( bool stream )
233 handle = ::socket ( AF_INET, (stream? SOCK_STREAM: SOCK_DGRAM), 0 ) ;
235 // Jan 26, 2010: Patch to avoid the problem of the socket resource not
236 // yet being available if the program is restarted quickly after being
239 // Reference: http://www.unixguide.net/network/socketfaq/4.5.shtml
241 // Also required for joining multicast domains
244 #if defined(_WIN32) || defined(__CYGWIN__)
245 setsockopt( handle, SOL_SOCKET, SO_REUSEADDR, (char *)&opt_boolean,
246 sizeof(opt_boolean) );
248 setsockopt( handle, SOL_SOCKET, SO_REUSEADDR, &opt_boolean,
249 sizeof(opt_boolean) );
253 return (handle != -1);
257 void Socket::setBlocking ( bool blocking )
259 assert ( handle != -1 ) ;
262 u_long nblocking = blocking? 0: 1;
263 ::ioctlsocket(handle, FIONBIO, &nblocking);
266 int delay_flag = ::fcntl (handle, F_GETFL, 0);
269 delay_flag &= (~O_NDELAY);
271 delay_flag |= O_NDELAY;
273 ::fcntl (handle, F_SETFL, delay_flag);
278 void Socket::setBroadcast ( bool broadcast )
280 assert ( handle != -1 ) ;
284 #if defined(_WIN32) || defined(__CYGWIN__)
285 result = ::setsockopt( handle, SOL_SOCKET, SO_BROADCAST, (char*)&one, sizeof(one) );
287 result = ::setsockopt( handle, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one) );
290 result = ::setsockopt( handle, SOL_SOCKET, SO_BROADCAST, NULL, 0 );
294 throw sg_exception("Socket::setBroadcast failed");
299 int Socket::bind ( const char* host, int port )
302 assert ( handle != -1 ) ;
303 IPAddress addr ( host, port ) ;
305 #if !defined(WINSOCK)
306 if( (result = ::bind(handle, addr.getAddr(), addr.getAddrLen() ) ) < 0 ) {
307 SG_LOG(SG_IO, SG_ALERT, "bind(" << addr.getHost() << ":" << addr.getPort() << ") failed. Errno " << errno << " (" << strerror(errno) << ")");
312 // 224.0.0.0 - 239.255.255.255 are multicast
313 // Usage of 239.x.x.x is recommended for local scope
314 // Reference: http://tools.ietf.org/html/rfc5771
315 if( ntohl(addr.getIP()) >= 0xe0000000 && ntohl(addr.getIP()) <= 0xefffffff ) {
318 struct sockaddr_in a;
319 a.sin_addr.S_un.S_addr = INADDR_ANY;
320 a.sin_family = AF_INET;
321 a.sin_port = htons(port);
323 if( (result = ::bind(handle,(const sockaddr*)&a,sizeof(a))) < 0 ) {
324 SG_LOG(SG_IO, SG_ALERT, "bind(any:" << port << ") failed. Errno " << errno << " (" << strerror(errno) << ")");
330 mreq.imr_multiaddr.s_addr = addr.getIP();
331 mreq.imr_interface.s_addr = htonl(INADDR_ANY);
332 if( (result=::setsockopt(getHandle(), IPPROTO_IP, IP_ADD_MEMBERSHIP, (const char *)&mreq, sizeof(mreq))) != 0 ) {
333 SG_LOG(SG_IO, SG_ALERT, "setsockopt(IP_ADD_MEMBERSHIP) failed. Errno " << errno << " (" << strerror(errno) << ")");
338 else if( (result = ::bind(handle,addr.getAddr(), addr.getAddrLen())) < 0 ) {
339 SG_LOG(SG_IO, SG_ALERT, "bind(" << host << ":" << port << ") failed. Errno " << errno << " (" << strerror(errno) << ")");
348 int Socket::listen ( int backlog )
350 assert ( handle != -1 ) ;
351 return ::listen(handle,backlog);
355 int Socket::accept ( IPAddress* addr )
357 assert ( handle != -1 ) ;
361 return ::accept(handle,NULL,NULL);
365 socklen_t addr_len = addr->getAddrLen(); ;
366 return ::accept(handle, addr->getAddr(), &addr_len);
371 int Socket::connect ( const char* host, int port )
373 IPAddress addr ( host, port ) ;
374 return connect ( &addr );
378 int Socket::connect ( IPAddress* addr )
380 assert ( handle != -1 ) ;
381 if ( addr->getBroadcast() ) {
382 setBroadcast( true );
384 return ::connect(handle, addr->getAddr(), addr->getAddrLen() );
388 int Socket::send (const void * buffer, int size, int flags)
390 assert ( handle != -1 ) ;
391 return ::send (handle, (const char*)buffer, size, flags);
395 int Socket::sendto ( const void * buffer, int size,
396 int flags, const IPAddress* to )
398 assert ( handle != -1 ) ;
399 return ::sendto(handle,(const char*)buffer,size,flags,
400 (const sockaddr*) to->getAddr(), to->getAddrLen());
404 int Socket::recv (void * buffer, int size, int flags)
406 assert ( handle != -1 ) ;
407 return ::recv (handle, (char*)buffer, size, flags);
411 int Socket::recvfrom ( void * buffer, int size,
412 int flags, IPAddress* from )
414 assert ( handle != -1 ) ;
415 socklen_t fromlen = (socklen_t) from->getAddrLen() ;
416 return ::recvfrom(handle,(char*)buffer,size,flags, from->getAddr(),&fromlen);
420 void Socket::close (void)
425 ::closesocket( handle );
434 bool Socket::isNonBlockingError ()
437 int wsa_errno = WSAGetLastError();
438 if ( wsa_errno != 0 )
441 SG_LOG(SG_IO, SG_WARN, "isNonBlockingError: WSAGetLastError():" << wsa_errno);
443 case WSAEWOULDBLOCK: // always == NET_EAGAIN?
452 case EWOULDBLOCK: // always == NET_EAGAIN?
463 //////////////////////////////////////////////////////////////////////
465 // modified version by os
467 //////////////////////////////////////////////////////////////////////
468 int Socket::select ( Socket** reads, Socket** writes, int timeout )
481 for ( i=0; reads[i]; i++ )
483 int fd = reads[i]->getHandle();
491 for ( i=0; writes[i]; i++ )
493 int fd = writes[i]->getHandle();
502 /* Set up the timeout */
504 tv.tv_sec = timeout/1000;
505 tv.tv_usec = (timeout%1000)*1000;
507 // It bothers me that select()'s first argument does not appear to
508 // work as advertised... [it hangs like this if called with
509 // anything less than FD_SETSIZE, which seems wasteful?]
511 // Note: we ignore the 'exception' fd_set - I have never had a
512 // need to use it. The name is somewhat misleading - the only
513 // thing I have ever seen it used for is to detect urgent data -
514 // which is an unportable feature anyway.
516 retval = ::select (FD_SETSIZE, &r, &w, 0, &tv);
518 //remove sockets that had no activity
524 for ( k=i=0; reads[i]; i++ )
526 int fd = reads[i]->getHandle();
527 if ( FD_ISSET (fd, &r) )
529 reads[k++] = reads[i];
538 for ( k=i=0; writes[i]; i++ )
540 int fd = writes[i]->getHandle();
541 if ( FD_ISSET (fd, &w) )
543 writes[k++] = writes[i];
550 if (retval == 0) // timeout
552 if (retval == -1)// error
559 /* Init/Exit functions */
561 static void netExit ( void )
564 /* Clean up windows networking */
565 if ( WSACleanup() == SOCKET_ERROR ) {
566 if ( WSAGetLastError() == WSAEINPROGRESS ) {
567 WSACancelBlockingCall();
574 int Socket::initSockets()
577 /* Start up the windows networking */
578 WORD version_wanted = MAKEWORD(1,1);
581 if ( WSAStartup(version_wanted, &wsaData) != 0 ) {
582 throw sg_exception("WinSock initialization failed");
591 } // of namespace simgear