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/* x_net_udpreceive.c 20060424. Martin Peach did it based on x_net.c. x_net.c header follows: */
/* Copyright (c) 1997-1999 Miller Puckette.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
#include "m_pd.h"
#include "s_stuff.h"
#include <string.h>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <stdio.h>
#endif
/* ----------------------------- udpreceive ------------------------- */
static t_class *udpreceive_class;
#define MAX_UDP_RECEIVE 65536L // longer than data in maximum UDP packet
typedef struct _udpreceive
{
t_object x_obj;
t_outlet *x_msgout;
t_outlet *x_addrout;
int x_connectsocket;
int x_multicast_joined;
long x_total_received;
t_atom x_addrbytes[5];
t_atom x_msgoutbuf[MAX_UDP_RECEIVE];
char x_msginbuf[MAX_UDP_RECEIVE];
} t_udpreceive;
void udpreceive_setup(void);
static void udpreceive_free(t_udpreceive *x);
static void *udpreceive_new(t_symbol *s, int argc, t_atom *argv);
static void udpreceive_status(t_udpreceive *x);
static void udpreceive_read(t_udpreceive *x, int sockfd);
static void udpreceive_read(t_udpreceive *x, int sockfd)
{
int i, read = 0;
struct sockaddr_in from;
socklen_t fromlen = sizeof(from);
t_atom output_atom;
long addr;
unsigned short port;
read = recvfrom(sockfd, x->x_msginbuf, MAX_UDP_RECEIVE, 0, (struct sockaddr *)&from, &fromlen);
#ifdef DEBUG
post("udpreceive_read: read %lu x->x_connectsocket = %d",
read, x->x_connectsocket);
#endif
/* get the sender's ip */
addr = ntohl(from.sin_addr.s_addr);
port = ntohs(from.sin_port);
x->x_addrbytes[0].a_w.w_float = (addr & 0xFF000000)>>24;
x->x_addrbytes[1].a_w.w_float = (addr & 0x0FF0000)>>16;
x->x_addrbytes[2].a_w.w_float = (addr & 0x0FF00)>>8;
x->x_addrbytes[3].a_w.w_float = (addr & 0x0FF);
x->x_addrbytes[4].a_w.w_float = port;
outlet_anything(x->x_addrout, gensym("from"), 5L, x->x_addrbytes);
if (read < 0)
{
sys_sockerror("udpreceive_read");
sys_closesocket(x->x_connectsocket);
return;
}
if (read > 0)
{
for (i = 0; i < read; ++i)
{
/* convert the bytes in the buffer to floats in a list */
x->x_msgoutbuf[i].a_w.w_float = (float)(unsigned char)x->x_msginbuf[i];
}
x->x_total_received += read;
SETFLOAT(&output_atom, read);
outlet_anything(x->x_addrout, gensym("received"), 1, &output_atom);
/* send the list out the outlet */
if (read > 1) outlet_list(x->x_msgout, &s_list, read, x->x_msgoutbuf);
else outlet_float(x->x_msgout, x->x_msgoutbuf[0].a_w.w_float);
}
}
static void *udpreceive_new(t_symbol *s, int argc, t_atom *argv)
{
t_udpreceive *x;
struct sockaddr_in server;
struct hostent *hp;
#if defined MACOSX || defined _WIN32
struct ip_mreq mreq;
#else
struct ip_mreqn mreq;
#endif
int sockfd, portno = 0;
int multicast_joined = 0;
int intarg, i;
char addr[256] = {'\0'};
#ifdef DEBUG
post("udpreceive_new:argc is %d s is %s", argc, s->s_name);
#endif
for (i = 0; i < argc ;++i)
{
if (argv[i].a_type == A_FLOAT)
{
#ifdef DEBUG
post ("argv[%d] is a float: %f", i, argv[i].a_w.w_float);
#endif
portno = (int)argv[i].a_w.w_float;
}
else if (argv[i].a_type == A_SYMBOL)
{
#ifdef DEBUG
post ("argv[%d] is a symbol: %s", i, argv[i].a_w.w_symbol->s_name);
#endif
atom_string(&argv[i], addr, 256);
}
}
#ifdef DEBUG
post("Setting port %d, address %s", portno, addr);
#endif
/* create a socket */
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
#ifdef DEBUG
post("udpreceive_new: socket %d port %d", sockfd, portno);
#endif
if (sockfd < 0)
{
sys_sockerror("udpreceive: socket");
return 0;
}
server.sin_family = AF_INET;
if (addr[0] == 0) server.sin_addr.s_addr = INADDR_ANY;
else
{
hp = gethostbyname(addr);
if (hp == 0)
{
error("udpreceive: bad host?\n");
return 0;
}
memcpy((char *)&server.sin_addr, (char *)hp->h_addr, hp->h_length);
}
/* enable delivery of all multicast or broadcast (but not unicast)
* UDP datagrams to all sockets bound to the same port */
intarg = 1;
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
(char *)&intarg, sizeof(intarg)) < 0)
error("udpreceive: setsockopt (SO_REUSEADDR) failed");
/* if a multicast address was specified, join the multicast group */
/* hop count defaults to 1 so we won't leave the subnet*/
if (0xE0000000 == (ntohl(server.sin_addr.s_addr) & 0xF0000000))
{
#if defined MACOSX || defined _WIN32
mreq.imr_multiaddr.s_addr = server.sin_addr.s_addr;
mreq.imr_interface.s_addr = INADDR_ANY;/* can put a specific local IP address here if host is multihomed */
#else
mreq.imr_multiaddr.s_addr = server.sin_addr.s_addr;
mreq.imr_address.s_addr = INADDR_ANY;
mreq.imr_ifindex = 0;
#endif //MACOSX || _WIN32
if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
(char *)&mreq, sizeof(mreq)) < 0)
error("udpreceive: setsockopt (IP_ADD_MEMBERSHIP) failed");
else
{
multicast_joined = 1;
post ("udpreceive: added to multicast group");
}
}
/* assign server port number */
server.sin_port = htons((u_short)portno);
/* name the socket */
if (bind(sockfd, (struct sockaddr *)&server, sizeof(server)) < 0)
{
sys_sockerror("udpreceive: bind");
sys_closesocket(sockfd);
return (0);
}
x = (t_udpreceive *)pd_new(udpreceive_class);
x->x_msgout = outlet_new(&x->x_obj, &s_anything);
x->x_addrout = outlet_new(&x->x_obj, &s_anything);
x->x_connectsocket = sockfd;
/* convert the bytes in the buffer to floats in a list */
for (i = 0; i < MAX_UDP_RECEIVE; ++i)
{
x->x_msgoutbuf[i].a_type = A_FLOAT;
x->x_msgoutbuf[i].a_w.w_float = 0;
}
for (i = 0; i < 5; ++i)
{
x->x_addrbytes[i].a_type = A_FLOAT;
x->x_addrbytes[i].a_w.w_float = 0;
}
x->x_multicast_joined = multicast_joined;
x->x_total_received = 0L;
sys_addpollfn(x->x_connectsocket, (t_fdpollfn)udpreceive_read, x);
return (x);
}
static void udpreceive_status(t_udpreceive *x)
{
t_atom output_atom;
SETFLOAT(&output_atom, x->x_multicast_joined);
outlet_anything( x->x_addrout, gensym("multicast"), 1, &output_atom);
SETFLOAT(&output_atom, x->x_total_received);
outlet_anything( x->x_addrout, gensym("total"), 1, &output_atom);
}
static void udpreceive_free(t_udpreceive *x)
{
if (x->x_connectsocket >= 0)
{
sys_rmpollfn(x->x_connectsocket);
sys_closesocket(x->x_connectsocket);
}
}
void udpreceive_setup(void)
{
udpreceive_class = class_new(gensym("udpreceive"),
(t_newmethod)udpreceive_new, (t_method)udpreceive_free,
sizeof(t_udpreceive), CLASS_DEFAULT, A_GIMME, 0);
class_addmethod(udpreceive_class, (t_method)udpreceive_status,
gensym("status"), 0);
}
/* end udpreceive.c */
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