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 void IPAddress::set ( const char* host, int port )
72 addr = (struct sockaddr_in*) malloc(sizeof(struct sockaddr_in));
73 memset(addr, 0, sizeof(struct sockaddr_in));
75 addr->sin_family = AF_INET ;
76 addr->sin_port = htons (port);
78 /* Convert a string specifying a host name or one of a few symbolic
79 ** names to a numeric IP address. This usually calls getaddrinfo()
80 ** to do the work; the names "" and "<broadcast>" are special.
83 if (!host || host[0] == '\0') {
84 addr->sin_addr.s_addr = INADDR_ANY;
88 if (strcmp(host, "<broadcast>") == 0) {
89 addr->sin_addr.s_addr = INADDR_BROADCAST;
93 struct addrinfo* result = NULL;
94 int err = getaddrinfo(host, NULL, NULL /* no hints */, &result);
96 SG_LOG(SG_IO, SG_WARN, "getaddrinfo failed for '" << host << "' : " << gai_strerror(err));
97 } else if (result->ai_addrlen != getAddrLen()) {
98 SG_LOG(SG_IO, SG_ALERT, "mismatch in socket address sizes");
100 memcpy(addr, result->ai_addr, result->ai_addrlen);
103 freeaddrinfo(result);
104 addr->sin_port = htons (port); // fix up port after getaddrinfo
107 IPAddress::~IPAddress()
114 /* Create a string object representing an IP address.
115 This is always a string of the form 'dd.dd.dd.dd' (with variable
118 const char* IPAddress::getHost () const
120 static char buf [32];
121 long x = ntohl(addr->sin_addr.s_addr);
122 sprintf(buf, "%d.%d.%d.%d",
123 (int) (x>>24) & 0xff, (int) (x>>16) & 0xff,
124 (int) (x>> 8) & 0xff, (int) (x>> 0) & 0xff );
128 unsigned int IPAddress::getIP () const
130 return addr->sin_addr.s_addr;
133 unsigned int IPAddress::getPort() const
135 return ntohs(addr->sin_port);
138 unsigned int IPAddress::getFamily () const
140 return addr->sin_family;
143 const char* IPAddress::getLocalHost ()
145 //gethostbyname(gethostname())
148 memset(buf, 0, sizeof(buf));
149 gethostname(buf, sizeof(buf)-1);
150 const hostent *hp = gethostbyname(buf);
152 if (hp && *hp->h_addr_list)
154 in_addr addr = *((in_addr*)*hp->h_addr_list);
155 const char* host = inet_ntoa(addr);
165 bool IPAddress::getBroadcast () const
167 return (addr->sin_addr.s_addr == INADDR_BROADCAST);
170 unsigned int IPAddress::getAddrLen() const
172 return sizeof(struct sockaddr_in);
175 struct sockaddr* IPAddress::getAddr() const
177 return (struct sockaddr*) addr;
192 void Socket::setHandle (int _handle)
199 bool Socket::open ( bool stream )
202 handle = ::socket ( AF_INET, (stream? SOCK_STREAM: SOCK_DGRAM), 0 ) ;
204 // Jan 26, 2010: Patch to avoid the problem of the socket resource not
205 // yet being available if the program is restarted quickly after being
208 // Reference: http://www.unixguide.net/network/socketfaq/4.5.shtml
210 // Also required for joining multicast domains
213 #if defined(_WIN32) || defined(__CYGWIN__)
214 setsockopt( handle, SOL_SOCKET, SO_REUSEADDR, (char *)&opt_boolean,
215 sizeof(opt_boolean) );
217 setsockopt( handle, SOL_SOCKET, SO_REUSEADDR, &opt_boolean,
218 sizeof(opt_boolean) );
222 return (handle != -1);
226 void Socket::setBlocking ( bool blocking )
228 assert ( handle != -1 ) ;
231 u_long nblocking = blocking? 0: 1;
232 ::ioctlsocket(handle, FIONBIO, &nblocking);
235 int delay_flag = ::fcntl (handle, F_GETFL, 0);
238 delay_flag &= (~O_NDELAY);
240 delay_flag |= O_NDELAY;
242 ::fcntl (handle, F_SETFL, delay_flag);
247 void Socket::setBroadcast ( bool broadcast )
249 assert ( handle != -1 ) ;
253 #if defined(_WIN32) || defined(__CYGWIN__)
254 result = ::setsockopt( handle, SOL_SOCKET, SO_BROADCAST, (char*)&one, sizeof(one) );
256 result = ::setsockopt( handle, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one) );
259 result = ::setsockopt( handle, SOL_SOCKET, SO_BROADCAST, NULL, 0 );
263 throw sg_exception("Socket::setBroadcast failed");
268 int Socket::bind ( const char* host, int port )
271 assert ( handle != -1 ) ;
272 IPAddress addr ( host, port ) ;
274 #if !defined(WINSOCK)
275 if( (result = ::bind(handle, addr.getAddr(), addr.getAddrLen() ) ) < 0 ) {
276 SG_LOG(SG_IO, SG_ALERT, "bind(" << addr.getHost() << ":" << addr.getPort() << ") failed. Errno " << errno << " (" << strerror(errno) << ")");
281 // 224.0.0.0 - 239.255.255.255 are multicast
282 // Usage of 239.x.x.x is recommended for local scope
283 // Reference: http://tools.ietf.org/html/rfc5771
284 if( ntohl(addr.getIP()) >= 0xe0000000 && ntohl(addr.getIP()) <= 0xefffffff ) {
287 struct sockaddr_in a;
288 a.sin_addr.S_un.S_addr = INADDR_ANY;
289 a.sin_family = AF_INET;
290 a.sin_port = htons(port);
292 if( (result = ::bind(handle,(const sockaddr*)&a,sizeof(a))) < 0 ) {
293 SG_LOG(SG_IO, SG_ALERT, "bind(any:" << port << ") failed. Errno " << errno << " (" << strerror(errno) << ")");
299 mreq.imr_multiaddr.s_addr = addr.getIP();
300 mreq.imr_interface.s_addr = htonl(INADDR_ANY);
301 if( (result=::setsockopt(getHandle(), IPPROTO_IP, IP_ADD_MEMBERSHIP, (const char *)&mreq, sizeof(mreq))) != 0 ) {
302 SG_LOG(SG_IO, SG_ALERT, "setsockopt(IP_ADD_MEMBERSHIP) failed. Errno " << errno << " (" << strerror(errno) << ")");
307 else if( (result = ::bind(handle,addr->getAddr(), addr->getAddrLen())) < 0 ) {
308 SG_LOG(SG_IO, SG_ALERT, "bind(" << host << ":" << port << ") failed. Errno " << errno << " (" << strerror(errno) << ")");
317 int Socket::listen ( int backlog )
319 assert ( handle != -1 ) ;
320 return ::listen(handle,backlog);
324 int Socket::accept ( IPAddress* addr )
326 assert ( handle != -1 ) ;
330 return ::accept(handle,NULL,NULL);
334 socklen_t addr_len = addr->getAddrLen(); ;
335 return ::accept(handle, addr->getAddr(), &addr_len);
340 int Socket::connect ( const char* host, int port )
342 IPAddress addr ( host, port ) ;
343 return connect ( &addr );
347 int Socket::connect ( IPAddress* addr )
349 assert ( handle != -1 ) ;
350 if ( addr->getBroadcast() ) {
351 setBroadcast( true );
353 return ::connect(handle, addr->getAddr(), addr->getAddrLen() );
357 int Socket::send (const void * buffer, int size, int flags)
359 assert ( handle != -1 ) ;
360 return ::send (handle, (const char*)buffer, size, flags);
364 int Socket::sendto ( const void * buffer, int size,
365 int flags, const IPAddress* to )
367 assert ( handle != -1 ) ;
368 return ::sendto(handle,(const char*)buffer,size,flags,
369 (const sockaddr*) to->getAddr(), to->getAddrLen());
373 int Socket::recv (void * buffer, int size, int flags)
375 assert ( handle != -1 ) ;
376 return ::recv (handle, (char*)buffer, size, flags);
380 int Socket::recvfrom ( void * buffer, int size,
381 int flags, IPAddress* from )
383 assert ( handle != -1 ) ;
384 socklen_t fromlen = (socklen_t) from->getAddrLen() ;
385 return ::recvfrom(handle,(char*)buffer,size,flags, from->getAddr(),&fromlen);
389 void Socket::close (void)
394 ::closesocket( handle );
403 bool Socket::isNonBlockingError ()
406 int wsa_errno = WSAGetLastError();
407 if ( wsa_errno != 0 )
410 SG_LOG(SG_IO, SG_WARN, "isNonBlockingError: WSAGetLastError():" << wsa_errno);
412 case WSAEWOULDBLOCK: // always == NET_EAGAIN?
421 case EWOULDBLOCK: // always == NET_EAGAIN?
432 //////////////////////////////////////////////////////////////////////
434 // modified version by os
436 //////////////////////////////////////////////////////////////////////
437 int Socket::select ( Socket** reads, Socket** writes, int timeout )
450 for ( i=0; reads[i]; i++ )
452 int fd = reads[i]->getHandle();
460 for ( i=0; writes[i]; i++ )
462 int fd = writes[i]->getHandle();
471 /* Set up the timeout */
473 tv.tv_sec = timeout/1000;
474 tv.tv_usec = (timeout%1000)*1000;
476 // It bothers me that select()'s first argument does not appear to
477 // work as advertised... [it hangs like this if called with
478 // anything less than FD_SETSIZE, which seems wasteful?]
480 // Note: we ignore the 'exception' fd_set - I have never had a
481 // need to use it. The name is somewhat misleading - the only
482 // thing I have ever seen it used for is to detect urgent data -
483 // which is an unportable feature anyway.
485 retval = ::select (FD_SETSIZE, &r, &w, 0, &tv);
487 //remove sockets that had no activity
493 for ( k=i=0; reads[i]; i++ )
495 int fd = reads[i]->getHandle();
496 if ( FD_ISSET (fd, &r) )
498 reads[k++] = reads[i];
507 for ( k=i=0; writes[i]; i++ )
509 int fd = writes[i]->getHandle();
510 if ( FD_ISSET (fd, &w) )
512 writes[k++] = writes[i];
519 if (retval == 0) // timeout
521 if (retval == -1)// error
528 /* Init/Exit functions */
530 static void netExit ( void )
533 /* Clean up windows networking */
534 if ( WSACleanup() == SOCKET_ERROR ) {
535 if ( WSAGetLastError() == WSAEINPROGRESS ) {
536 WSACancelBlockingCall();
543 int Socket::initSockets()
546 /* Start up the windows networking */
547 WORD version_wanted = MAKEWORD(1,1);
550 if ( WSAStartup(version_wanted, &wsaData) != 0 ) {
551 throw sg_exception("WinSock initialization failed");
560 } // of namespace simgear