path: root/pd/src/x_net.c

/* 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.  */

/* network */

#include "m_pd.h"
#include "s_stuff.h"

#include <sys/types.h>
#include <string.h>
#ifdef MSW
#include <winsock.h>
#else
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <stdio.h>
#define SOCKET_ERROR -1
#endif

static t_class *netsend_class;

typedef struct _netsend
{
    t_object x_obj;
    int x_fd;
    int x_protocol;
} t_netsend;

static void *netsend_new(t_floatarg udpflag)
{
    t_netsend *x = (t_netsend *)pd_new(netsend_class);
    outlet_new(&x->x_obj, &s_float);
    x->x_fd = -1;
    x->x_protocol = (udpflag != 0 ? SOCK_DGRAM : SOCK_STREAM);
    return (x);
}

static void netsend_connect(t_netsend *x, t_symbol *hostname,
    t_floatarg fportno)
{
    struct sockaddr_in server;
    struct hostent *hp;
    int sockfd;
    int portno = fportno;
    int intarg;
    if (x->x_fd >= 0)
    {
        error("netsend_connect: already connected");
        return;
    }

        /* create a socket */
    sockfd = socket(AF_INET, x->x_protocol, 0);
#if 0
    fprintf(stderr, "send socket %d\n", sockfd);
#endif
    if (sockfd < 0)
    {
        sys_sockerror("socket");
        return;
    }
    /* connect socket using hostname provided in command line */
    server.sin_family = AF_INET;
    hp = gethostbyname(hostname->s_name);
    if (hp == 0)
    {
        post("bad host?\n");
        return;
    }
#if 0
    intarg = 0;
    if (setsockopt(sockfd, SOL_SOCKET, SO_SNDBUF,
        &intarg, sizeof(intarg)) < 0)
            post("setsockopt (SO_RCVBUF) failed\n");
#endif
        /* for stream (TCP) sockets, specify "nodelay" */
    if (x->x_protocol == SOCK_STREAM)
    {
        intarg = 1;
        if (setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY,
            (char *)&intarg, sizeof(intarg)) < 0)
                post("setsockopt (TCP_NODELAY) failed\n");
    }
    memcpy((char *)&server.sin_addr, (char *)hp->h_addr, hp->h_length);

    /* assign client port number */
    server.sin_port = htons((u_short)portno);

    post("connecting to port %d", portno);
        /* try to connect.  LATER make a separate thread to do this
        because it might block */
    if (connect(sockfd, (struct sockaddr *) &server, sizeof (server)) < 0)
    {
        sys_sockerror("connecting stream socket");
        sys_closesocket(sockfd);
        return;
    }
    x->x_fd = sockfd;
    outlet_float(x->x_obj.ob_outlet, 1);
}

static void netsend_disconnect(t_netsend *x)
{
    if (x->x_fd >= 0)
    {
        sys_closesocket(x->x_fd);
        x->x_fd = -1;
        outlet_float(x->x_obj.ob_outlet, 0);
    }
}

static void netsend_send(t_netsend *x, t_symbol *s, int argc, t_atom *argv)
{
    if (x->x_fd >= 0)
    {
        t_binbuf *b = binbuf_new();
        char *buf, *bp;
        int length, sent;
        t_atom at;
        binbuf_add(b, argc, argv);
        SETSEMI(&at);
        binbuf_add(b, 1, &at);
        binbuf_gettext(b, &buf, &length);
        for (bp = buf, sent = 0; sent < length;)
        {
            static double lastwarntime;
            static double pleasewarn;
            double timebefore = sys_getrealtime();
            int res = send(x->x_fd, bp, length-sent, 0);
            double timeafter = sys_getrealtime();
            int late = (timeafter - timebefore > 0.005);
            if (late || pleasewarn)
            {
                if (timeafter > lastwarntime + 2)
                {
                     post("netsend blocked %d msec",
                        (int)(1000 * ((timeafter - timebefore) + pleasewarn)));
                     pleasewarn = 0;
                     lastwarntime = timeafter;
                }
                else if (late) pleasewarn += timeafter - timebefore;
            }
            if (res <= 0)
            {
                sys_sockerror("netsend");
                netsend_disconnect(x);
                break;
            }
            else
            {
                sent += res;
                bp += res;
            }
        }
        t_freebytes(buf, length);
        binbuf_free(b);
    }
    else error("netsend: not connected");
}

static void netsend_free(t_netsend *x)
{
    netsend_disconnect(x);
}

static void netsend_setup(void)
{
    netsend_class = class_new(gensym("netsend"), (t_newmethod)netsend_new,
        (t_method)netsend_free,
        sizeof(t_netsend), 0, A_DEFFLOAT, 0);
    class_addmethod(netsend_class, (t_method)netsend_connect,
        gensym("connect"), A_SYMBOL, A_FLOAT, 0);
    class_addmethod(netsend_class, (t_method)netsend_disconnect,
        gensym("disconnect"), 0);
    class_addmethod(netsend_class, (t_method)netsend_send, gensym("send"),
        A_GIMME, 0);
}

/* ----------------------------- netreceive ------------------------- */

static t_class *netreceive_class;

typedef struct _netreceive
{
    t_object x_obj;
    t_outlet *x_msgout;
    t_outlet *x_connectout;
    int x_connectsocket;
    int x_nconnections;
    int x_udp;
} t_netreceive;

static void netreceive_notify(t_netreceive *x)
{
    outlet_float(x->x_connectout, --x->x_nconnections);
}

static void netreceive_doit(void *z, t_binbuf *b)
{
    t_atom messbuf[1024];
    t_netreceive *x = (t_netreceive *)z;
    int msg, natom = binbuf_getnatom(b);
    t_atom *at = binbuf_getvec(b);
    for (msg = 0; msg < natom;)
    {
        int emsg;
        for (emsg = msg; emsg < natom && at[emsg].a_type != A_COMMA
            && at[emsg].a_type != A_SEMI; emsg++)
                ;
        if (emsg > msg)
        {
            int i;
            for (i = msg; i < emsg; i++)
                if (at[i].a_type == A_DOLLAR || at[i].a_type == A_DOLLSYM)
            {
                pd_error(x, "netreceive: got dollar sign in message");
                goto nodice;
            }
            if (at[msg].a_type == A_FLOAT)
            {
                if (emsg > msg + 1)
                    outlet_list(x->x_msgout, 0, emsg-msg, at + msg);
                else outlet_float(x->x_msgout, at[msg].a_w.w_float);
            }
            else if (at[msg].a_type == A_SYMBOL)
                outlet_anything(x->x_msgout, at[msg].a_w.w_symbol,
                    emsg-msg-1, at + msg + 1);
        }
    nodice:
        msg = emsg + 1;
    }
}

static void netreceive_connectpoll(t_netreceive *x)
{
    int fd = accept(x->x_connectsocket, 0, 0);
    if (fd < 0) post("netreceive: accept failed");
    else
    {
        t_socketreceiver *y = socketreceiver_new((void *)x, 
            (t_socketnotifier)netreceive_notify,
                (x->x_msgout ? netreceive_doit : 0), 0);
        sys_addpollfn(fd, (t_fdpollfn)socketreceiver_read, y);
        outlet_float(x->x_connectout, ++x->x_nconnections);
    }
}

static void *netreceive_new(t_symbol *compatflag,
    t_floatarg fportno, t_floatarg udpflag)
{
    t_netreceive *x;
    struct sockaddr_in server;
    int sockfd, portno = fportno, udp = (udpflag != 0);
    int old = !strcmp(compatflag->s_name , "old");
    int intarg;
        /* create a socket */
    sockfd = socket(AF_INET, (udp ? SOCK_DGRAM : SOCK_STREAM), 0);
#if 0
    fprintf(stderr, "receive socket %d\n", sockfd);
#endif
    if (sockfd < 0)
    {
        sys_sockerror("socket");
        return (0);
    }
    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;

#if 1
        /* ask OS to allow another Pd to repoen this port after we close it. */
    intarg = 1;
    if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
        (char *)&intarg, sizeof(intarg)) < 0)
            post("setsockopt (SO_REUSEADDR) failed\n");
#endif
#if 0
    intarg = 0;
    if (setsockopt(sockfd, SOL_SOCKET, SO_RCVBUF,
        &intarg, sizeof(intarg)) < 0)
            post("setsockopt (SO_RCVBUF) failed\n");
#endif
        /* Stream (TCP) sockets are set NODELAY */
    if (!udp)
    {
        intarg = 1;
        if (setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY,
            (char *)&intarg, sizeof(intarg)) < 0)
                post("setsockopt (TCP_NODELAY) failed\n");
    }
        /* 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("bind");
        sys_closesocket(sockfd);
        return (0);
    }
    x = (t_netreceive *)pd_new(netreceive_class);
    if (old)
    {
        /* old style, nonsecure version */
        x->x_msgout = 0;
    }
    else x->x_msgout = outlet_new(&x->x_obj, &s_anything);

    if (udp)        /* datagram protocol */
    {
        t_socketreceiver *y = socketreceiver_new((void *)x, 
            (t_socketnotifier)netreceive_notify,
                (x->x_msgout ? netreceive_doit : 0), 1);
        sys_addpollfn(sockfd, (t_fdpollfn)socketreceiver_read, y);
        x->x_connectout = 0;
    }
    else        /* streaming protocol */
    {
        if (listen(sockfd, 5) < 0)
        {
            sys_sockerror("listen");
            sys_closesocket(sockfd);
            sockfd = -1;
        }
        else
        {
            sys_addpollfn(sockfd, (t_fdpollfn)netreceive_connectpoll, x);
            x->x_connectout = outlet_new(&x->x_obj, &s_float);
        }
    }
    x->x_connectsocket = sockfd;
    x->x_nconnections = 0;
    x->x_udp = udp;

    return (x);
}

static void netreceive_free(t_netreceive *x)
{
        /* LATER make me clean up open connections */
    if (x->x_connectsocket >= 0)
    {
        sys_rmpollfn(x->x_connectsocket);
        sys_closesocket(x->x_connectsocket);
    }
}

static void netreceive_setup(void)
{
    netreceive_class = class_new(gensym("netreceive"),
        (t_newmethod)netreceive_new, (t_method)netreceive_free,
        sizeof(t_netreceive), CLASS_NOINLET, A_DEFFLOAT, A_DEFFLOAT, 
            A_DEFSYM, 0);
}

void x_net_setup(void)
{
    netsend_setup();
    netreceive_setup();
}