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
45 # include <sys/types.h>
46 # include <sys/socket.h>
47 # include <netinet/in.h>
48 # include <arpa/inet.h>
49 # include <sys/time.h>
55 #if defined(_MSC_VER) && !defined(socklen_t)
59 #include <simgear/debug/logstream.hxx>
60 #include <simgear/structure/exception.hxx>
65 IPAddress::IPAddress ( const char* host, int port )
70 IPAddress::IPAddress( const IPAddress& other ) :
74 addr = (struct sockaddr_in*) malloc(sizeof(struct sockaddr_in));
75 memcpy(addr, other.addr, sizeof(struct sockaddr_in));
79 const IPAddress& IPAddress::operator=(const IPAddress& other)
87 addr = (struct sockaddr_in*) malloc(sizeof(struct sockaddr_in));
88 memcpy(addr, other.addr, sizeof(struct sockaddr_in));
94 void IPAddress::set ( const char* host, int port )
96 addr = (struct sockaddr_in*) malloc(sizeof(struct sockaddr_in));
97 memset(addr, 0, sizeof(struct sockaddr_in));
99 addr->sin_family = AF_INET ;
100 addr->sin_port = htons (port);
102 /* Convert a string specifying a host name or one of a few symbolic
103 ** names to a numeric IP address. This usually calls getaddrinfo()
104 ** to do the work; the names "" and "<broadcast>" are special.
107 if (!host || host[0] == '\0') {
108 addr->sin_addr.s_addr = INADDR_ANY;
112 if (strcmp(host, "<broadcast>") == 0) {
113 addr->sin_addr.s_addr = INADDR_BROADCAST;
117 struct addrinfo* result = NULL;
118 int err = getaddrinfo(host, NULL, NULL /* no hints */, &result);
120 SG_LOG(SG_IO, SG_WARN, "getaddrinfo failed for '" << host << "' : " << gai_strerror(err));
121 } else if (result->ai_addrlen != getAddrLen()) {
122 SG_LOG(SG_IO, SG_ALERT, "mismatch in socket address sizes");
124 memcpy(addr, result->ai_addr, result->ai_addrlen);
127 freeaddrinfo(result);
128 addr->sin_port = htons (port); // fix up port after getaddrinfo
131 IPAddress::~IPAddress()
138 /* Create a string object representing an IP address.
139 This is always a string of the form 'dd.dd.dd.dd' (with variable
142 const char* IPAddress::getHost () const
144 static char buf [32];
145 long x = ntohl(addr->sin_addr.s_addr);
146 sprintf(buf, "%d.%d.%d.%d",
147 (int) (x>>24) & 0xff, (int) (x>>16) & 0xff,
148 (int) (x>> 8) & 0xff, (int) (x>> 0) & 0xff );
152 unsigned int IPAddress::getIP () const
154 return addr->sin_addr.s_addr;
157 unsigned int IPAddress::getPort() const
159 return ntohs(addr->sin_port);
162 unsigned int IPAddress::getFamily () const
164 return addr->sin_family;
167 const char* IPAddress::getLocalHost ()
169 //gethostbyname(gethostname())
172 memset(buf, 0, sizeof(buf));
173 gethostname(buf, sizeof(buf)-1);
174 const hostent *hp = gethostbyname(buf);
176 if (hp && *hp->h_addr_list)
178 in_addr addr = *((in_addr*)*hp->h_addr_list);
179 const char* host = inet_ntoa(addr);
189 bool IPAddress::getBroadcast () const
191 return (addr->sin_addr.s_addr == INADDR_BROADCAST);
194 unsigned int IPAddress::getAddrLen() const
196 return sizeof(struct sockaddr_in);
199 struct sockaddr* IPAddress::getAddr() const
201 return (struct sockaddr*) addr;
216 void Socket::setHandle (int _handle)
223 bool Socket::open ( bool stream )
226 handle = ::socket ( AF_INET, (stream? SOCK_STREAM: SOCK_DGRAM), 0 ) ;
228 // Jan 26, 2010: Patch to avoid the problem of the socket resource not
229 // yet being available if the program is restarted quickly after being
232 // Reference: http://www.unixguide.net/network/socketfaq/4.5.shtml
234 // Also required for joining multicast domains
237 #if defined(_WIN32) || defined(__CYGWIN__)
238 setsockopt( handle, SOL_SOCKET, SO_REUSEADDR, (char *)&opt_boolean,
239 sizeof(opt_boolean) );
241 setsockopt( handle, SOL_SOCKET, SO_REUSEADDR, &opt_boolean,
242 sizeof(opt_boolean) );
246 return (handle != -1);
250 void Socket::setBlocking ( bool blocking )
252 assert ( handle != -1 ) ;
255 u_long nblocking = blocking? 0: 1;
256 ::ioctlsocket(handle, FIONBIO, &nblocking);
259 int delay_flag = ::fcntl (handle, F_GETFL, 0);
262 delay_flag &= (~O_NDELAY);
264 delay_flag |= O_NDELAY;
266 ::fcntl (handle, F_SETFL, delay_flag);
271 void Socket::setBroadcast ( bool broadcast )
273 assert ( handle != -1 ) ;
277 #if defined(_WIN32) || defined(__CYGWIN__)
278 result = ::setsockopt( handle, SOL_SOCKET, SO_BROADCAST, (char*)&one, sizeof(one) );
280 result = ::setsockopt( handle, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one) );
283 result = ::setsockopt( handle, SOL_SOCKET, SO_BROADCAST, NULL, 0 );
287 throw sg_exception("Socket::setBroadcast failed");
292 int Socket::bind ( const char* host, int port )
295 assert ( handle != -1 ) ;
296 IPAddress addr ( host, port ) ;
298 #if !defined(WINSOCK)
299 if( (result = ::bind(handle, addr.getAddr(), addr.getAddrLen() ) ) < 0 ) {
300 SG_LOG(SG_IO, SG_ALERT, "bind(" << addr.getHost() << ":" << addr.getPort() << ") failed. Errno " << errno << " (" << strerror(errno) << ")");
305 // 224.0.0.0 - 239.255.255.255 are multicast
306 // Usage of 239.x.x.x is recommended for local scope
307 // Reference: http://tools.ietf.org/html/rfc5771
308 if( ntohl(addr.getIP()) >= 0xe0000000 && ntohl(addr.getIP()) <= 0xefffffff ) {
311 struct sockaddr_in a;
312 a.sin_addr.S_un.S_addr = INADDR_ANY;
313 a.sin_family = AF_INET;
314 a.sin_port = htons(port);
316 if( (result = ::bind(handle,(const sockaddr*)&a,sizeof(a))) < 0 ) {
317 SG_LOG(SG_IO, SG_ALERT, "bind(any:" << port << ") failed. Errno " << errno << " (" << strerror(errno) << ")");
323 mreq.imr_multiaddr.s_addr = addr.getIP();
324 mreq.imr_interface.s_addr = htonl(INADDR_ANY);
325 if( (result=::setsockopt(getHandle(), IPPROTO_IP, IP_ADD_MEMBERSHIP, (const char *)&mreq, sizeof(mreq))) != 0 ) {
326 SG_LOG(SG_IO, SG_ALERT, "setsockopt(IP_ADD_MEMBERSHIP) failed. Errno " << errno << " (" << strerror(errno) << ")");
331 else if( (result = ::bind(handle,addr->getAddr(), addr->getAddrLen())) < 0 ) {
332 SG_LOG(SG_IO, SG_ALERT, "bind(" << host << ":" << port << ") failed. Errno " << errno << " (" << strerror(errno) << ")");
341 int Socket::listen ( int backlog )
343 assert ( handle != -1 ) ;
344 return ::listen(handle,backlog);
348 int Socket::accept ( IPAddress* addr )
350 assert ( handle != -1 ) ;
354 return ::accept(handle,NULL,NULL);
358 socklen_t addr_len = addr->getAddrLen(); ;
359 return ::accept(handle, addr->getAddr(), &addr_len);
364 int Socket::connect ( const char* host, int port )
366 IPAddress addr ( host, port ) ;
367 return connect ( &addr );
371 int Socket::connect ( IPAddress* addr )
373 assert ( handle != -1 ) ;
374 if ( addr->getBroadcast() ) {
375 setBroadcast( true );
377 return ::connect(handle, addr->getAddr(), addr->getAddrLen() );
381 int Socket::send (const void * buffer, int size, int flags)
383 assert ( handle != -1 ) ;
384 return ::send (handle, (const char*)buffer, size, flags);
388 int Socket::sendto ( const void * buffer, int size,
389 int flags, const IPAddress* to )
391 assert ( handle != -1 ) ;
392 return ::sendto(handle,(const char*)buffer,size,flags,
393 (const sockaddr*) to->getAddr(), to->getAddrLen());
397 int Socket::recv (void * buffer, int size, int flags)
399 assert ( handle != -1 ) ;
400 return ::recv (handle, (char*)buffer, size, flags);
404 int Socket::recvfrom ( void * buffer, int size,
405 int flags, IPAddress* from )
407 assert ( handle != -1 ) ;
408 socklen_t fromlen = (socklen_t) from->getAddrLen() ;
409 return ::recvfrom(handle,(char*)buffer,size,flags, from->getAddr(),&fromlen);
413 void Socket::close (void)
418 ::closesocket( handle );
427 bool Socket::isNonBlockingError ()
430 int wsa_errno = WSAGetLastError();
431 if ( wsa_errno != 0 )
434 SG_LOG(SG_IO, SG_WARN, "isNonBlockingError: WSAGetLastError():" << wsa_errno);
436 case WSAEWOULDBLOCK: // always == NET_EAGAIN?
445 case EWOULDBLOCK: // always == NET_EAGAIN?
456 //////////////////////////////////////////////////////////////////////
458 // modified version by os
460 //////////////////////////////////////////////////////////////////////
461 int Socket::select ( Socket** reads, Socket** writes, int timeout )
474 for ( i=0; reads[i]; i++ )
476 int fd = reads[i]->getHandle();
484 for ( i=0; writes[i]; i++ )
486 int fd = writes[i]->getHandle();
495 /* Set up the timeout */
497 tv.tv_sec = timeout/1000;
498 tv.tv_usec = (timeout%1000)*1000;
500 // It bothers me that select()'s first argument does not appear to
501 // work as advertised... [it hangs like this if called with
502 // anything less than FD_SETSIZE, which seems wasteful?]
504 // Note: we ignore the 'exception' fd_set - I have never had a
505 // need to use it. The name is somewhat misleading - the only
506 // thing I have ever seen it used for is to detect urgent data -
507 // which is an unportable feature anyway.
509 retval = ::select (FD_SETSIZE, &r, &w, 0, &tv);
511 //remove sockets that had no activity
517 for ( k=i=0; reads[i]; i++ )
519 int fd = reads[i]->getHandle();
520 if ( FD_ISSET (fd, &r) )
522 reads[k++] = reads[i];
531 for ( k=i=0; writes[i]; i++ )
533 int fd = writes[i]->getHandle();
534 if ( FD_ISSET (fd, &w) )
536 writes[k++] = writes[i];
543 if (retval == 0) // timeout
545 if (retval == -1)// error
552 /* Init/Exit functions */
554 static void netExit ( void )
557 /* Clean up windows networking */
558 if ( WSACleanup() == SOCKET_ERROR ) {
559 if ( WSAGetLastError() == WSAEINPROGRESS ) {
560 WSACancelBlockingCall();
567 int Socket::initSockets()
570 /* Start up the windows networking */
571 WORD version_wanted = MAKEWORD(1,1);
574 if ( WSAStartup(version_wanted, &wsaData) != 0 ) {
575 throw sg_exception("WinSock initialization failed");
584 } // of namespace simgear