3 * Copyright 2007,2008,2009,2010 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
26 #include <gr_udp_source.h>
27 #include <gr_io_signature.h>
33 #if defined(HAVE_NETDB_H)
35 typedef void* optval_t;
37 // ntohs() on FreeBSD may require both netinet/in.h and arpa/inet.h, in order
38 #if defined(HAVE_NETINET_IN_H)
39 #include <netinet/in.h>
41 #if defined(HAVE_ARPA_INET_H)
42 #include <arpa/inet.h>
45 #elif defined(HAVE_WINDOWS_H)
46 // if not posix, assume winsock
51 typedef char* optval_t;
54 #define USE_SELECT 1 // non-blocking receive on all platforms
55 #define USE_RCV_TIMEO 0 // non-blocking receive on all but Cygwin
58 static int is_error( int perr )
60 // Compare error to posix error code; return nonzero if match.
61 #if defined(USING_WINSOCK)
62 #define ENOPROTOOPT 109
63 // All codes to be checked for must be defined below
64 int werr = WSAGetLastError();
67 return( perr == EAGAIN );
69 return( perr == ENOPROTOOPT );
71 fprintf(stderr,"gr_udp_source/is_error: unknown error %d\n", perr );
72 throw std::runtime_error("internal error");
76 return( perr == errno );
80 static void report_error( const char *msg1, const char *msg2 )
82 // Deal with errors, both posix and winsock
83 #if defined(USING_WINSOCK)
84 int werr = WSAGetLastError();
85 fprintf(stderr, "%s: winsock error %d\n", msg1, werr );
90 throw std::runtime_error(msg2);
94 gr_udp_source::gr_udp_source(size_t itemsize, const char *host,
95 unsigned short port, int payload_size,
97 : gr_sync_block ("udp_source",
98 gr_make_io_signature(0, 0, 0),
99 gr_make_io_signature(1, 1, itemsize)),
100 d_itemsize(itemsize), d_payload_size(payload_size),
101 d_eof(eof), d_wait(wait), d_residual(0), d_temp_offset(0)
105 #if defined(USING_WINSOCK) // for Windows (with MinGW)
106 // initialize winsock DLL
108 int iResult = WSAStartup( MAKEWORD(2,2), &wsaData );
109 if( iResult != NO_ERROR ) {
110 report_error( "gr_udp_source WSAStartup", "can't open socket" );
114 // Set up the address stucture for the source address and port numbers
115 // Get the source IP address from the host name
116 struct addrinfo *ip_src; // store the source IP address to use
117 struct addrinfo hints;
118 memset( (void*)&hints, 0, sizeof(hints) );
119 hints.ai_family = AF_INET;
120 hints.ai_socktype = SOCK_DGRAM;
121 hints.ai_protocol = IPPROTO_UDP;
122 hints.ai_flags = AI_PASSIVE;
124 sprintf( port_str, "%d", port );
125 ret = getaddrinfo( host, port_str, &hints, &ip_src );
127 report_error("gr_udp_source/getaddrinfo",
128 "can't initialize source socket" );
130 d_temp_buff = new char[d_payload_size]; // allow it to hold up to payload_size bytes
133 d_socket = socket(ip_src->ai_family, ip_src->ai_socktype,
134 ip_src->ai_protocol);
136 report_error("socket open","can't open socket");
139 // Turn on reuse address
141 if(setsockopt(d_socket, SOL_SOCKET, SO_REUSEADDR, (optval_t)&opt_val, sizeof(int)) == -1) {
142 report_error("SO_REUSEADDR","can't set socket option SO_REUSEADDR");
145 // Don't wait when shutting down
149 if(setsockopt(d_socket, SOL_SOCKET, SO_LINGER, (optval_t)&lngr, sizeof(linger)) == -1) {
150 if( !is_error(ENOPROTOOPT) ) { // no SO_LINGER for SOCK_DGRAM on Windows
151 report_error("SO_LINGER","can't set socket option SO_LINGER");
156 // Set a timeout on the receive function to not block indefinitely
157 // This value can (and probably should) be changed
159 #if defined(USING_WINSOCK)
160 DWORD timeout = 1000; // milliseconds
166 if(setsockopt(d_socket, SOL_SOCKET, SO_RCVTIMEO, (optval_t)&timeout, sizeof(timeout)) == -1) {
167 report_error("SO_RCVTIMEO","can't set socket option SO_RCVTIMEO");
169 #endif // USE_RCV_TIMEO
171 // bind socket to an address and port number to listen on
172 if(bind (d_socket, ip_src->ai_addr, ip_src->ai_addrlen) == -1) {
173 report_error("socket bind","can't bind socket");
175 freeaddrinfo(ip_src);
180 gr_make_udp_source (size_t itemsize, const char *ipaddr,
181 unsigned short port, int payload_size, bool eof, bool wait)
183 return gr_udp_source_sptr (new gr_udp_source (itemsize, ipaddr,
184 port, payload_size, eof, wait));
187 gr_udp_source::~gr_udp_source ()
189 delete [] d_temp_buff;
192 shutdown(d_socket, SHUT_RDWR);
193 #if defined(USING_WINSOCK)
194 closesocket(d_socket);
201 #if defined(USING_WINSOCK) // for Windows (with MinGW)
202 // free winsock resources
208 gr_udp_source::work (int noutput_items,
209 gr_vector_const_void_star &input_items,
210 gr_vector_void_star &output_items)
212 char *out = (char *) output_items[0];
213 ssize_t r=0, nbytes=0, bytes_received=0;
214 ssize_t total_bytes = (ssize_t)(d_itemsize*noutput_items);
217 printf("\nEntered udp_source\n");
220 // Remove items from temp buffer if they are in there
222 nbytes = std::min(d_residual, total_bytes);
223 memcpy(out, d_temp_buff+d_temp_offset, nbytes);
224 bytes_received = nbytes;
227 printf("\tTemp buff size: %d offset: %d (bytes_received: %d) (noutput_items: %d)\n",
228 d_residual, d_temp_offset, bytes_received, noutput_items);
232 out += bytes_received;
234 // Update indexing of amount of bytes left in the buffer
235 d_residual -= nbytes;
236 d_temp_offset = d_temp_offset+d_residual;
240 // Use select() to determine when socket is readable
248 // get the data into our output buffer and record the number of bytes
251 // RCV_TIMEO doesn't work on all systems (e.g., Cygwin)
252 // use select() instead of, or in addition to RCV_TIMEO
254 FD_SET(d_socket, &readfds);
255 r = select(FD_SETSIZE, &readfds, NULL, NULL, &timeout);
257 report_error("udp_source/select",NULL);
260 else if(r == 0 ) { // timed out
262 // Allow boost thread interrupt, then try again
263 boost::this_thread::interruption_point();
271 // This is a non-blocking call with a timeout set in the constructor
272 r = recv(d_socket, d_temp_buff, d_payload_size, 0); // get the entire payload or the what's available
274 // Check if there was a problem; forget it if the operation just timed out
276 if( is_error(EAGAIN) ) { // handle non-blocking call timeout
278 printf("UDP receive timed out\n");
282 // Allow boost thread interrupt, then try again
283 boost::this_thread::interruption_point();
290 report_error("udp_source/recv",NULL);
296 // zero-length packet interpreted as EOF
299 printf("\tzero-length packet received; returning EOF\n");
305 // do we need to allow boost thread interrupt?
306 boost::this_thread::interruption_point();
311 // Calculate the number of bytes we can take from the buffer in this call
312 nbytes = std::min(r, total_bytes-bytes_received);
314 // adjust the total number of bytes we have to round down to nearest integer of an itemsize
315 nbytes -= ((bytes_received+nbytes) % d_itemsize);
317 // copy the number of bytes we want to look at here
318 memcpy(out, d_temp_buff, nbytes);
320 d_residual = r - nbytes; // save the number of bytes stored
321 d_temp_offset=nbytes; // reset buffer index
323 // keep track of the total number of bytes received
324 bytes_received += nbytes;
326 // increment the pointer
329 // Immediately return when data comes in
334 printf("\tbytes received: %d bytes (nbytes: %d)\n", bytes, nbytes);
339 printf("Total Bytes Received: %d (bytes_received / noutput_items = %d / %d)\n",
340 bytes_received, bytes_received, noutput_items);
343 // bytes_received is already set to some integer multiple of itemsize
344 return bytes_received/d_itemsize;
347 // Return port number of d_socket
348 int gr_udp_source::get_port(void)
351 socklen_t len = sizeof(name);
352 int ret = getsockname( d_socket, (sockaddr*)&name, &len );
354 report_error("gr_udp_source/getsockname",NULL);
357 return ntohs(name.sin_port);