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/*
* TCP/IP stream emulation for GNU Emacs.
* Copyright (C) 1988, 1989, 1992, 1993 Free Software Foundation, Inc.
* Author: Masanobu Umeda
* Maintainer: umerin@mse.kyutech.ac.jp
This file is part of GNU Emacs.
GNU Emacs 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, or (at your option)
any later version.
GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*
* Yasunari, Itoh at PFU limited contributed for Fujitsu UTS and SX/A.
*
* Thu Apr 6 13:47:37 JST 1989
* USG fixes by Sakaeda <saka@mickey.trad.pf.fujitsu.junet>
*
* For Fujitsu UTS compile with:
* cc -O -o tcp tcp.c -DFUJITSU_UTS -lu -lsocket
*/
#include <stdio.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/types.h>
#ifdef FUJITSU_UTS
#define USG
#include <sys/ucbtypes.h>
#include <sys/tisp/socket.h>
#include <netdb.h>
#include <sys/tisp/in.h>
#else
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#endif
#ifdef USG
#include <sys/stat.h>
#include <signal.h>
#endif
#ifdef FUJITSU_UTS
#define bcopy(f, t, n) memcpy (t, f, n)
#define bcmp(b1, b2, n) (memcmp (b1, b2, n)!=0)
#define bzero(b, n) memset (b, 0, n)
#endif
#ifdef USG
int selectable = 1;
sigout ()
{
fcntl (fileno (stdin), F_SETFL, 0);
exit (-1);
}
#endif
main (argc, argv)
int argc;
char *argv[];
{
struct hostent *host;
struct sockaddr_in sockin, sockme;
struct servent *serv;
char *hostname = NULL;
char *service = "nntp";
int port;
int readfds;
int writefds;
int server; /* NNTP Server */
int emacsIn = fileno (stdin); /* Emacs intput */
int emacsOut = fileno (stdout); /* Emacs output */
char buffer[1024];
int nbuffer; /* Number of bytes in buffer */
int wret;
char *retry; /* retry bufferp */
int false = 0; /* FALSE flag for setsockopt () */
if (argc < 2)
{
fprintf (stderr, "Usage: %s HOST [SERVICE]\n", argv[0]);
exit (1);
}
if (argc >= 2)
hostname = argv[1];
if (argc >= 3)
service = argv[2];
if ((host = gethostbyname (hostname)) == NULL)
{
perror ("gethostbyname");
exit (1);
}
if (isdigit (service[0]))
port = atoi (service);
else
{
serv = getservbyname (service, "tcp");
if (serv == NULL)
{
perror ("getservbyname");
exit (1);
}
port = serv->s_port;
}
bzero (&sockin, sizeof (sockin));
sockin.sin_family = host->h_addrtype;
bcopy (host->h_addr, &sockin.sin_addr, host->h_length);
sockin.sin_port = htons (port);
if ((server = socket (AF_INET, SOCK_STREAM, 0)) < 0)
{
perror ("socket");
exit (1);
}
if (setsockopt (server, SOL_SOCKET, SO_REUSEADDR, &false, sizeof (false)))
{
perror ("setsockopt");
exit (1);
}
bzero (&sockme, sizeof (sockme));
sockme.sin_family = sockin.sin_family;
sockme.sin_addr.s_addr = INADDR_ANY;
if (bind (server, &sockme, sizeof (sockme)) < 0)
{
perror ("bind");
exit (1);
}
if (connect (server, &sockin, sizeof (sockin)) < 0)
{
perror ("connect");
close (server);
exit (1);
}
#ifdef O_NDELAY
fcntl (server, F_SETFL, O_NDELAY);
#ifdef USG
/* USG pipe cannot not select emacsIn */
{
struct stat statbuf;
fstat (emacsIn, &statbuf);
if (statbuf.st_mode & 010000)
selectable = 0;
if (!selectable)
{
signal (SIGINT, sigout);
fcntl (emacsIn, F_SETFL, O_NDELAY);
}
}
#endif
#endif
/* Connection established. */
while (1)
{
readfds = (1 << server) | (1 << emacsIn);
if (select (32, &readfds, NULL, NULL, (struct timeval *)NULL) == -1)
{
perror ("select");
exit (1);
}
if (readfds & (1 << emacsIn))
{
/* From Emacs */
nbuffer = read (emacsIn, buffer, sizeof buffer -1);
#ifdef USG
if (selectable && nbuffer == 0)
{
goto finish;
}
else if (!(readfds & (1 << server)) && nbuffer == 0)
{
sleep (1);
}
else
#else
if (nbuffer == 0)
goto finish;
#endif
for (retry = buffer; nbuffer > 0; nbuffer -= wret, retry += wret)
{
writefds = 1 << server;
if (select (server+1, NULL, &writefds, NULL, (struct timeval*)NULL) == -1)
{
perror ("select");
exit (1);
}
wret = write (server, retry, nbuffer);
if (wret < 0) goto finish;
}
}
if (readfds & (1 << server))
{
/* From NNTP server */
nbuffer = read (server, buffer, sizeof buffer -1);
if (nbuffer == 0)
goto finish;
for (retry = buffer; nbuffer > 0; nbuffer -= wret, retry += wret)
{
writefds = 1 << emacsOut;
#ifdef USG
if (selectable)
#endif
if (select (emacsOut+1, NULL, &writefds, NULL, (struct timeval*)NULL) == -1)
{
perror ("select");
exit (1);
}
wret = write (emacsOut, retry, nbuffer);
if (wret < 0) goto finish;
}
}
}
/* End of communication. */
finish:
close (server);
#ifdef USG
if (!selectable) fcntl (emacsIn, F_SETFL, 0);
#endif
close (emacsIn);
close (emacsOut);
exit (0);
}
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