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/* Copyright (c) 2000 Miller Puckette.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in the Pd distribution. */
/* the "pdreceive" command. This is a standalone program that receives messages
from Pd via the netsend/netreceive ("FUDI") protocol, and copies them to
standard output. */
#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.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>
#include <unistd.h>
#define SOCKET_ERROR -1
#endif
typedef struct _fdpoll {
int fd;
char *inbuf;
int inhead;
int intail;
int udp;
} t_fdpoll;
static int nfdpoll;
static t_fdpoll *fdpoll;
static int maxfd;
static int sockfd;
static int protocol;
static void sockerror(const char *s);
static void x_closesocket(int fd);
static void dopoll();
#define BUFSIZE 4096
int main(int argc, char **argv) {{ // open extra scope because of goto and decls
int portno;
struct sockaddr_in server;
if (argc < 2 || sscanf(argv[1],"%d",&portno)<1 || portno<=0) goto usage;
if (argc >= 3) {
if (!strcmp(argv[2],"tcp")) protocol = SOCK_STREAM;
else if (!strcmp(argv[2],"udp")) protocol = SOCK_DGRAM;
else goto usage;
} else protocol = SOCK_STREAM;
#ifdef MSW
short version = MAKEWORD(2, 0);
WSADATA nobby;
if (WSAStartup(version, &nobby)) sockerror("WSAstartup");
#endif
sockfd = socket(AF_INET, protocol, 0);
if (sockfd < 0) {
sockerror("socket()");
exit(1);
}
maxfd = sockfd + 1;
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
#ifdef IRIX
/* this seems to work only in IRIX but is unnecessary in Linux. Not sure what MSW needs in place of this. */
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, 0, 0) < 0) fprintf(stderr, "setsockopt failed\n");
#endif
/* assign client port number */
server.sin_port = htons((unsigned short)portno);
/* name the socket */
if (bind(sockfd, (struct sockaddr *)&server, sizeof(server))<0) {sockerror("bind"); x_closesocket(sockfd); return 0;}
if (protocol == SOCK_STREAM) if (listen(sockfd, 5) < 0) {sockerror("listen"); x_closesocket(sockfd); return 1;}
/* now loop forever selecting on sockets */
while (1) dopoll();
} // close extra scope so that we can goto.
usage:
fprintf(stderr, "usage: pdreceive <portnumber> [udp|tcp]\n");
fprintf(stderr, "(default is tcp)\n");
return 1;
}
static void addport(int fd) {
fdpoll = (t_fdpoll *)realloc(fdpoll, (nfdpoll+1)*sizeof(t_fdpoll));
t_fdpoll *fp = fdpoll + nfdpoll;
fp->fd = fd;
nfdpoll++;
if (fd >= maxfd) maxfd = fd + 1;
fp->inhead = fp->intail = 0;
if (!(fp->inbuf = (char *) malloc(BUFSIZE))) {fprintf(stderr, "out of memory"); exit(1);}
printf("number_connected %d;\n", nfdpoll);
}
static void rmport(t_fdpoll *x) {
t_fdpoll *fp = fdpoll;
for (int i=nfdpoll; i--; fp++) {
if (fp == x) {
x_closesocket(fp->fd);
free(fp->inbuf);
for (;i--;fp++) fp[0] = fp[1];
fdpoll = (t_fdpoll *)realloc(fdpoll, (nfdpoll-1)*sizeof(t_fdpoll));
nfdpoll--;
printf("number_connected %d;\n", nfdpoll);
return;
}
}
fprintf(stderr, "warning: item removed from poll list but not found");
}
static void doconnect() {
int fd = accept(sockfd, 0, 0);
if (fd < 0) perror("accept");
else addport(fd);
}
static void udpread() {
char buf[BUFSIZE];
int ret = recv(sockfd, buf, BUFSIZE, 0);
if (ret<0) {
sockerror("recv (udp)");
x_closesocket(sockfd);
exit(1);
} else if (ret>0) {
#ifdef MSW
for (int j=0; j<ret; j++) putchar(buf[j]);
#else
if (write(1, buf, ret) < ret) {perror("write"); exit(1);}
#endif
}
}
static int tcpmakeoutput(t_fdpoll *x) {
char messbuf[BUFSIZE+1], *bp = messbuf;
int inhead = x->inhead;
int intail = x->intail;
char *inbuf = x->inbuf;
if (intail == inhead) return 0;
for (int indx = intail; indx != inhead; indx = (indx+1)&(BUFSIZE-1)) {
/* search for a semicolon. */
char c = *bp++ = inbuf[indx];
if (c == ';') {
intail = (indx+1)&(BUFSIZE-1);
if (inbuf[intail] == '\n') intail = (intail+1)&(BUFSIZE-1);
*bp++ = '\n';
#ifdef MSW
for (int j=0; j<bp-messbuf; j++) putchar(messbuf[j]);
#else
if (write(1, messbuf, bp-messbuf)<bp-messbuf) {perror("write"); exit(1);}
#endif
x->inhead = inhead;
x->intail = intail;
return 1;
}
}
return 0;
}
static void tcpread(t_fdpoll *x) {
int readto = x->inhead >= x->intail ? BUFSIZE : x->intail-1;
int ret;
/* the input buffer might be full. If so, drop the whole thing */
if (readto == x->inhead) {
fprintf(stderr, "pd: dropped message from gui\n");
x->inhead = x->intail = 0;
readto = BUFSIZE;
} else {
ret = recv(x->fd, x->inbuf + x->inhead, readto - x->inhead, 0);
if (ret < 0) {
sockerror("recv (tcp)");
rmport(x);
} else if (ret == 0) rmport(x);
else {
x->inhead += ret;
if (x->inhead >= BUFSIZE) x->inhead = 0;
while (tcpmakeoutput(x)) {}
}
}
}
static void dopoll() {
fd_set readset, writeset, exceptset;
FD_ZERO(&writeset);
FD_ZERO(&readset);
FD_ZERO(&exceptset);
FD_SET(sockfd, &readset);
if (protocol == SOCK_STREAM) {
t_fdpoll *fp = fdpoll;
for (int i=nfdpoll; i--; fp++) FD_SET(fp->fd, &readset);
}
if (select(maxfd+1, &readset, &writeset, &exceptset, 0) < 0) {perror("select"); exit(1);}
if (protocol == SOCK_STREAM) {
for (int i=0; i<nfdpoll; i++) if (FD_ISSET(fdpoll[i].fd, &readset)) tcpread(&fdpoll[i]);
if (FD_ISSET(sockfd, &readset)) doconnect();
} else {
if (FD_ISSET(sockfd, &readset)) udpread();
}
}
static void sockerror(const char *s) {
#ifdef MSW
int err = WSAGetLastError();
if (err == 10054) return;
else if (err == 10044) fprintf(stderr,"Warning: you might not have TCP/IP \"networking\" turned on\n");
#else
int err = errno;
#endif
fprintf(stderr, "%s: %s (%d)\n", s, strerror(err), err);
}
static void x_closesocket(int fd) {
#ifdef MSW
closesocket(fd);
#else
close(fd);
#endif
}
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