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metaserver.c
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metaserver.c
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/* Copyright (C) 2000 [email protected]
This is free software distributed under the terms of the
GNU Public License. See the file COPYING for details.
$Id$ */
/* a simple napster metaserver. redirects clients to a specific set of
servers */
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#if HAVE_POLL
#include <sys/poll.h>
#endif /* HAVE_POLL */
#ifndef HAVE_SOCKLEN_T
typedef unsigned int socklen_t;
#endif
static void
handler (int sig)
{
(void) sig;
}
static void
usage (void)
{
puts
("usage: metaserver [ -v ] [ -l IP ] [ -p <port> ] [ host:port ... ]");
puts (" -v display version number and exit");
puts (" -l IP listen only on interface for IP");
puts (" -p <port> listen for connection on <port> (default is 8875)\n");
puts (" if no arguments are given, defaults to 127.0.0.1:8888");
exit (1);
}
int
main (int argc, char **argv)
{
char *hosts[32];
struct sockaddr_in sin;
int i, s, f, port = 8875, numhosts = 0;
#if HAVE_POLL
struct pollfd ufd;
#else
fd_set set;
#endif /* HAVE_POLL */
socklen_t sinsize;
struct sigaction sa;
unsigned int iface = INADDR_ANY;
while ((i = getopt (argc, argv, "hl:vp:")) != EOF)
{
switch (i)
{
case 'l':
iface = inet_addr (optarg);
break;
case 'p':
port = atoi (optarg);
break;
case 'v':
printf ("%s metaserver version %s\n", PACKAGE, VERSION);
exit (1);
default:
usage ();
}
}
/* read in the host list */
if (!argv[optind])
hosts[numhosts++] = strdup ("127.0.0.1:8888"); /* use default host */
else
{
while (argv[optind])
{
hosts[numhosts++] = strdup (argv[optind]);
optind++;
}
}
/* set some signal handlers so we can shut down gracefully */
memset (&sa, 0, sizeof (sa));
sa.sa_handler = handler;
sigaction (SIGINT, &sa, 0);
sigaction (SIGHUP, &sa, 0);
sigaction (SIGTERM, &sa, 0);
memset (&sin, 0, sizeof (sin));
sin.sin_port = htons (port);
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = iface;
s = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (s < 0)
{
perror ("socket");
exit (1);
}
if (bind (s, (struct sockaddr *) &sin, sizeof (sin)) < 0)
{
perror ("bind");
exit (1);
}
if (listen (s, 50) < 0)
{
perror ("listen");
exit (1);
}
i = 0;
#if HAVE_POLL
memset (&ufd, 0, sizeof (ufd));
ufd.fd = s;
ufd.events = POLLIN;
#endif /* HAVE_POLL */
for (;;)
{
#if HAVE_POLL
if (poll (&ufd, 1, -1) == -1)
{
perror ("poll");
break;
}
#else
FD_ZERO (&set);
FD_SET (s, &set);
if (select (s + 1, &set, 0, 0, 0) < 0)
{
perror ("select");
break;
}
#endif /* HAVE_POLL */
sinsize = sizeof (sin);
f = accept (s, (struct sockaddr *) &sin, &sinsize);
if (f < 0)
{
perror ("accept");
break;
}
write (f, hosts[i], strlen (hosts[i]));
write (f, "\n", 1);
i = (i + 1) % numhosts;
close (f);
}
close (s);
exit (0);
}