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ncpfs/util/ipx_probe.c
ncpfs archive import 82706139bf Import ncpfs 2.2.1
2026-04-28 20:39:59 +02:00

484 lines
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/*
ipx_probe.c - Check the network for frames currently active
Copyright (C) 1996 by Volker Lendecke
This program 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 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Revision history:
0.00 1996 Volker Lendecke
Initial revision.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <ncp/ext/socket.h>
#include <ncp/kernel/ipx.h>
#include <ncp/kernel/if.h>
#include <unistd.h>
#include <string.h>
#include <netinet/in.h>
#include <errno.h>
#include "private/libintl.h"
#define _(X) gettext(X)
static char *progname;
int verbose = 0;
static void
usage (void)
{
fprintf (stderr, _("usage: %s [options]\n"), progname);
fprintf (stderr, _("type '%s -h' for help\n"), progname);
}
static void
help (void)
{
printf (_("\n"
"Probe an interface for ipx networks\n"
"\n"));
printf (_("usage: %s [options]\n"), progname);
printf (_("\n"
"-v Verbose output\n"
"-i interface Interface to probe, default: eth0\n"
"-t timeout Seconds to wait for answer, default: 3\n"
"-h Print this help text\n\n"));
}
#define IPX_SAP_PTYPE (0x04)
#define IPX_SAP_NEAREST_QUERY (0x0003)
#define IPX_SAP_PORT (0x0452)
#define IPX_BROADCAST_NODE ("\xff\xff\xff\xff\xff\xff")
#define BVAL(buf,pos) (((u_int8_t *)(buf))[pos])
#define BSET(buf,pos,val) (BVAL(buf,pos) = (val))
static inline void
WSET_HL (u_int8_t * buf, int pos, u_int16_t val)
{
BSET (buf, pos, val >> 8);
BSET (buf, pos + 1, val & 0xff);
}
struct frame_type
{
char *ft_name;
unsigned char ft_val;
};
static struct frame_type frame_types[] =
{
{
"802.2", IPX_FRAME_8022
}
,
#ifdef IPX_FRAME_TR_8022
{
"802.2TR", IPX_FRAME_TR_8022
}
,
#endif
{
"802.3", IPX_FRAME_8023
}
,
{
"SNAP", IPX_FRAME_SNAP
}
,
{
"EtherII", IPX_FRAME_ETHERII
}
};
#define NFTYPES (sizeof(frame_types)/sizeof(struct frame_type))
static char *
frame_name (int frame_type)
{
unsigned int i;
for (i = 0; i < NFTYPES; i++)
{
if (frame_types[i].ft_val == frame_type)
{
return frame_types[i].ft_name;
}
}
return NULL;
}
static int
ipx_recvfrom (int sock, void *buf, int len, unsigned int flags,
struct sockaddr_ipx *sender, socklen_t *addrlen, int timeout,
long *err)
{
fd_set rd, wr, ex;
struct timeval tv;
int result;
FD_ZERO (&rd);
FD_ZERO (&wr);
FD_ZERO (&ex);
FD_SET (sock, &rd);
tv.tv_sec = timeout;
tv.tv_usec = 0;
if ((result = select (sock + 1, &rd, &wr, &ex, &tv)) == -1)
{
*err = errno;
return -1;
}
if (FD_ISSET (sock, &rd))
{
result = recvfrom (sock, buf, len, flags,
(struct sockaddr *) sender, addrlen);
}
else
{
result = -1;
errno = ETIMEDOUT;
}
if (result < 0)
{
*err = errno;
}
return result;
}
static int
ipx_recv (int sock, void *buf, int len, unsigned int flags, int timeout,
long *err)
{
struct sockaddr_ipx sender;
socklen_t addrlen = sizeof (sender);
return ipx_recvfrom (sock, buf, len, flags, &sender, &addrlen,
timeout, err);
}
static int
probe_frame (char *interface, int frame_type, int timeout, unsigned long *net)
{
int i, sock, opt;
int result;
long err;
char errmsg[strlen (progname) + 20];
char data[1024];
static struct ifreq id;
struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &id.ifr_addr;
if (verbose != 0)
{
printf (_("probing %s on %s -- "), frame_name (frame_type),
interface);
fflush (stdout);
}
sock = socket (AF_IPX, SOCK_DGRAM, IPXPROTO_IPX);
if (sock < 0)
{
int old_errno = errno;
sprintf (errmsg, _("%s: socket"), progname);
perror (errmsg);
if (old_errno == -EINVAL)
{
fprintf (stderr, _("Probably you have no IPX support in "
"your kernel\n"));
}
close (sock);
return -1;
}
memset (&id, 0, sizeof (id));
strncpy (id.ifr_name, interface, sizeof (id.ifr_name) - 1);
sipx->sipx_family = AF_IPX;
sipx->sipx_action = IPX_CRTITF;
sipx->sipx_special = IPX_PRIMARY;
sipx->sipx_network = 0L;
sipx->sipx_type = frame_type;
i = 0;
do
{
result = ioctl (sock, SIOCSIFADDR, &id);
i++;
}
while ((i < 5) && (result < 0) && (errno == EAGAIN));
if (result < 0)
{
int old_errno = errno;
close (sock);
errno = old_errno;
return result;
}
/* We do a GNS request on the new socket. If something comes
back, we assume that the frame type is valid. */
opt = 1;
if ((result = setsockopt (sock, SOL_SOCKET,
SO_BROADCAST, &opt, sizeof (opt))) < 0)
{
int old_errno = errno;
close (sock);
errno = old_errno;
return result;
}
memset (&id, 0, sizeof (id));
sipx->sipx_family = AF_IPX;
sipx->sipx_network = htonl (0x0);
sipx->sipx_port = htons (0x0);
sipx->sipx_type = IPX_SAP_PTYPE;
if ((result = bind (sock, (struct sockaddr *) sipx,
sizeof (*sipx))) < 0 - 1)
{
int old_errno = errno;
close (sock);
errno = old_errno;
return result;
}
WSET_HL (data, 0, IPX_SAP_NEAREST_QUERY);
WSET_HL (data, 2, 4);
memset (&id, 0, sizeof (id));
sipx->sipx_family = AF_IPX;
sipx->sipx_port = htons (IPX_SAP_PORT);
sipx->sipx_type = IPX_SAP_PTYPE;
sipx->sipx_network = htonl (0x0);
memcpy (sipx->sipx_node, IPX_BROADCAST_NODE, 6);
if ((result = sendto (sock, data, 4, 0, (struct sockaddr *) sipx,
sizeof (*sipx))) < 0)
{
int old_errno = errno;
close (sock);
errno = old_errno;
return result;
}
result = ipx_recv (sock, data, 1024, 0, timeout, &err);
if (result > 0)
{
struct sockaddr_ipx sipx;
int namelen = sizeof (sipx);
if (getsockname (sock, (struct sockaddr *) &sipx,
&namelen) < 0)
{
fprintf (stderr, _("%s: Could not find socket address\n"),
progname);
exit (1);
}
*net = ntohl (sipx.sipx_network);
}
memset (&id, 0, sizeof (id));
strncpy (id.ifr_name, interface, sizeof (id.ifr_name) - 1);
sipx->sipx_family = AF_IPX;
sipx->sipx_action = IPX_DLTITF;
sipx->sipx_network = 0L;
sipx->sipx_type = frame_type;
result = ioctl (sock, SIOCSIFADDR, &id);
close (sock);
if (result < 0)
{
fprintf (stderr, _("%s: could not delete interface\n"),
progname);
exit (1);
}
if (err == ETIMEDOUT)
{
if (verbose != 0)
{
printf (_("no network found\n"));
}
return -1;
}
if (verbose != 0)
{
printf (_("found IPX network %8.8lX\n"), *net);
}
return 0;
}
static int
file_lines (char *name)
{
FILE *f = fopen (name, "r");
char buf[100];
int lines = 0;
if (f == NULL)
{
return -errno;
}
while (fgets (buf, sizeof (buf), f) != NULL)
{
lines += 1;
}
fclose (f);
return lines;
}
static int
ipx_interfaces (void)
{
int result = file_lines ("/proc/net/ipx_interface");
if (result == 0)
{
result = -EIO;
}
return result - 1;
}
static int
ipx_auto_off (void)
{
int s;
char errmsg[strlen (progname) + 20];
int val = 0;
s = socket (AF_IPX, SOCK_DGRAM, AF_IPX);
if (s < 0)
{
int old_errno = errno;
sprintf (errmsg, _("%s: socket"), progname);
perror (errmsg);
if (old_errno == -EINVAL)
{
fprintf (stderr, _("Probably you have no IPX support in "
"your kernel\n"));
}
close (s);
return -1;
}
sprintf (errmsg, _("%s: ioctl"), progname);
if (ioctl (s, SIOCAIPXPRISLT, &val) < 0)
{
perror (errmsg);
close (s);
return -1;
}
if (ioctl (s, SIOCAIPXITFCRT, &val) < 0)
{
perror (errmsg);
close (s);
return -1;
}
close (s);
return 0;
}
int
main (int argc, char *argv[])
{
int interfaces;
char *interface = "eth0";
int opt;
int timeout = 3;
unsigned long network[5] =
{0,};
progname = argv[0];
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
while ((opt = getopt (argc, argv, "vi:ht:")) != EOF)
{
switch (opt)
{
case 'v':
verbose = 1;
break;
case 'i':
interface = optarg;
break;
case 't':
timeout = atoi (optarg);
break;
case 'h':
help ();
exit (1);
default:
usage ();
exit (1);
}
}
if (ipx_auto_off () < 0)
{
exit (1);
}
interfaces = ipx_interfaces ();
if (interfaces > 0)
{
fprintf (stderr, _("%s must be run with no interfaces configured."
" Found %d interface%s.\n"),
progname, interfaces,
interfaces == 1 ? "" : "s");
exit (1);
}
if (interfaces < 0)
{
fprintf (stderr, _("%s: %s\n"), progname, strerror (interfaces));
exit (1);
}
probe_frame (interface, IPX_FRAME_8022, timeout, &(network[0]));
probe_frame (interface, IPX_FRAME_8023, timeout, &(network[1]));
probe_frame (interface, IPX_FRAME_SNAP, timeout, &(network[2]));
probe_frame (interface, IPX_FRAME_ETHERII, timeout, &(network[3]));
if (verbose == 0)
{
if (network[0] != 0)
{
printf (_("%s %8.8lX\n"),
frame_name (IPX_FRAME_8022), network[0]);
}
if (network[1] != 0)
{
printf (_("%s %8.8lX\n"),
frame_name (IPX_FRAME_8023), network[1]);
}
if (network[2] != 0)
{
printf (_("%s %8.8lX\n"),
frame_name (IPX_FRAME_SNAP), network[2]);
}
if (network[3] != 0)
{
printf (_("%s %8.8lX\n"),
frame_name (IPX_FRAME_ETHERII), network[3]);
}
}
return 0;
}
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