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/* udpclient.c
* copyright (c) 2010 IOhannes m zmölnig, IEM
*/
/* */
/* A client for bidirectional communication from within Pd. */
/* */
/* This program is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU General Public License */
/* as published by the Free Software Foundation; either version 2 */
/* of the License, or (at your option) any later version. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program; if not, write to the Free Software */
/* Foundation, Inc., */
/* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */
/* */
/* ---------------------------------------------------------------------------- */
#define DEBUGLEVEL 1
#include "iemnet.h"
#include <string.h>
#include <pthread.h>
static t_class *udpclient_class;
static const char objName[] = "udpclient";
typedef struct _udpclient
{
t_object x_obj;
t_clock *x_clock;
t_outlet *x_msgout;
t_outlet *x_addrout;
t_outlet *x_connectout;
t_outlet *x_statusout;
t_iemnet_sender*x_sender;
t_iemnet_receiver*x_receiver;
int x_fd; // the socket
char *x_hostname; // address we want to connect to as text
int x_connectstate; // 0 = not connected, 1 = connected
int x_port; // port we're connected to
long x_addr; // address we're connected to as 32bit int
/* multithread stuff */
pthread_t x_threadid; /* id of child thread */
pthread_attr_t x_threadattr; /* attributes of child thread */
t_iemnet_floatlist *x_floatlist;
} t_udpclient;
static void udpclient_receive_callback(void *x, t_iemnet_chunk*);
/* connection handling */
static void *udpclient_child_connect(void *w)
{
t_udpclient *x = (t_udpclient*) w;
struct sockaddr_in server;
struct hostent *hp;
int sockfd;
int broadcast = 1;/* nonzero is true */
if (x->x_sender)
{
error("[%s] already connected", objName);
return (x);
}
/* create a socket */
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
DEBUG("send socket %d\n", sockfd);
if (sockfd < 0)
{
sys_sockerror("udpclient: socket");
return (x);
}
/* Based on zmoelnig's patch 2221504:
Enable sending of broadcast messages (if hostname is a broadcast address)*/
#ifdef SO_BROADCAST
if( 0 != setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, (const void *)&broadcast, sizeof(broadcast)))
{
error("[%s] couldn't switch to broadcast mode", objName);
}
#endif /* SO_BROADCAST */
/* connect socket using hostname provided in command line */
server.sin_family = AF_INET;
hp = gethostbyname(x->x_hostname);
if (hp == 0)
{
error("[%s] bad host '%s'?", objName, x->x_hostname);
return (x);
}
memcpy((char *)&server.sin_addr, (char *)hp->h_addr, hp->h_length);
/* assign client port number */
server.sin_port = htons((u_short)x->x_port);
DEBUG("connecting to port %d", x->x_port);
/* try to connect. */
if (connect(sockfd, (struct sockaddr *) &server, sizeof (server)) < 0)
{
sys_sockerror("udpclient: connecting stream socket");
sys_closesocket(sockfd);
return (x);
}
x->x_fd = sockfd;
x->x_addr = ntohl(*(long *)hp->h_addr);
x->x_sender=iemnet__sender_create(sockfd);
x->x_receiver=iemnet__receiver_create(sockfd, x, udpclient_receive_callback);
x->x_connectstate = 1;
clock_delay(x->x_clock, 0);
return (x);
}
static void udpclient_tick(t_udpclient *x)
{
outlet_float(x->x_connectout, 1);
}
static void udpclient_disconnect(t_udpclient *x)
{
if (x->x_fd >= 0)
{
DEBUG("disconnect %x %x", x->x_sender, x->x_receiver);
if(x->x_receiver)iemnet__receiver_destroy(x->x_receiver); x->x_receiver=NULL;
if(x->x_sender)iemnet__sender_destroy(x->x_sender); x->x_sender=NULL;
sys_closesocket(x->x_fd);
x->x_fd = -1;
x->x_connectstate = 0;
outlet_float(x->x_connectout, 0);
}
else pd_error(x, "[%s] not connected", objName);
}
static void udpclient_connect(t_udpclient *x, t_symbol *hostname, t_floatarg fportno)
{
if(x->x_fd>=0)udpclient_disconnect(x);
/* we get hostname and port and pass them on
to the child thread that establishes the connection */
x->x_hostname = hostname->s_name;
x->x_port = fportno;
x->x_connectstate = 0;
/* start child thread */
if(pthread_create(&x->x_threadid, &x->x_threadattr, udpclient_child_connect, x) < 0)
error("%s: could not create new thread", objName);
}
/* sending/receiving */
static void udpclient_send(t_udpclient *x, t_symbol *s, int argc, t_atom *argv)
{
int size=0;
t_atom output_atom;
t_iemnet_sender*sender=x->x_sender;
t_iemnet_chunk*chunk=iemnet__chunk_create_list(argc, argv);
if(sender && chunk) {
size=iemnet__sender_send(sender, chunk);
}
iemnet__chunk_destroy(chunk);
SETFLOAT(&output_atom, size);
outlet_anything( x->x_statusout, gensym("sent"), 1, &output_atom);
}
static void udpclient_receive_callback(void*y, t_iemnet_chunk*c) {
t_udpclient *x=(t_udpclient*)y;
if(c) {
iemnet__addrout(x->x_statusout, x->x_addrout, x->x_addr, x->x_port);
x->x_floatlist=iemnet__chunk2list(c, x->x_floatlist); // gets destroyed in the dtor
outlet_list(x->x_msgout, gensym("list"),x->x_floatlist->argc, x->x_floatlist->argv);
} else {
// disconnected
DEBUG("disconnected");
if(x->x_fd >= 0) {
udpclient_disconnect(x);
}
}
}
/* constructor/destructor */
static void *udpclient_new(void)
{
t_udpclient *x = (t_udpclient *)pd_new(udpclient_class);
x->x_msgout = outlet_new(&x->x_obj, 0); /* received data */
x->x_addrout = outlet_new(&x->x_obj, gensym("list"));
x->x_connectout = outlet_new(&x->x_obj, gensym("float")); /* connection state */
x->x_statusout = outlet_new(&x->x_obj, 0);/* last outlet for everything else */
x->x_fd = -1;
x->x_addr = 0L;
x->x_port = 0;
x->x_sender=NULL;
x->x_receiver=NULL;
x->x_clock = clock_new(x, (t_method)udpclient_tick);
x->x_floatlist=iemnet__floatlist_create(1024);
/* prepare child thread */
if(pthread_attr_init(&x->x_threadattr) < 0)
verbose(1, "[%s] warning: could not prepare child thread", objName);
if(pthread_attr_setdetachstate(&x->x_threadattr, PTHREAD_CREATE_DETACHED) < 0)
verbose(1, "[%s] warning: could not prepare child thread", objName);
return (x);
}
static void udpclient_free(t_udpclient *x)
{
udpclient_disconnect(x);
if(x->x_clock)clock_free(x->x_clock);x->x_clock=NULL;
if(x->x_floatlist)iemnet__floatlist_destroy(x->x_floatlist);x->x_floatlist=NULL;
}
IEMNET_EXTERN void udpclient_setup(void)
{
if(!iemnet__register(objName))return;
udpclient_class = class_new(gensym(objName), (t_newmethod)udpclient_new,
(t_method)udpclient_free,
sizeof(t_udpclient), 0, A_DEFFLOAT, 0);
class_addmethod(udpclient_class, (t_method)udpclient_connect, gensym("connect")
, A_SYMBOL, A_FLOAT, 0);
class_addmethod(udpclient_class, (t_method)udpclient_disconnect, gensym("disconnect"), 0);
class_addmethod(udpclient_class, (t_method)udpclient_send, gensym("send"), A_GIMME, 0);
class_addlist(udpclient_class, (t_method)udpclient_send);
DEBUGMETHOD(udpclient_class);
}
IEMNET_INITIALIZER(udpclient_setup);
/* end of udpclient.c */
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