* Copyright (c) 1989, 1993, 1995

/* $NetBSD: showmount.c,v 1.25 2025/06/05 08:08:41 bad Exp $ */

/*
* Copyright (c) 1989, 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1995\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)showmount.c 8.3 (Berkeley) 3/29/95";
#endif
__RCSID("$NetBSD: showmount.c,v 1.25 2025/06/05 08:08:41 bad Exp $");
#endif /* not lint */

#include <sys/types.h>
#include <sys/file.h>
#include <sys/socket.h>

#include <netdb.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <nfs/rpcv2.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <err.h>
#include <vis.h>

/* Constant defs */
#define ALL 1
#define DIRS 2

#define DODUMP 0x1
#define DOEXPORTS 0x2
#define DOPARSABLEEXPORTS 0x4

struct mountlist {
struct mountlist *ml_left;
struct mountlist *ml_right;
char ml_host[RPCMNT_NAMELEN+1];
char ml_dirp[RPCMNT_PATHLEN+1];
};

struct grouplist {
struct grouplist *gr_next;
char gr_name[RPCMNT_NAMELEN+1];
};

struct exportslist {
struct exportslist *ex_next;
struct grouplist *ex_groups;
char ex_dirp[RPCMNT_PATHLEN+1];
};

static struct mountlist *mntdump;
static struct exportslist *exports;
static int type = 0;

static void print_dump(struct mountlist *);
__dead static void usage(void);
static int xdr_mntdump(XDR *, struct mountlist **);
static int xdr_exports(XDR *, struct exportslist **);
static int tcp_callrpc(const char *host, int prognum, int versnum,
int procnum, xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);

/*
* This command queries the NFS mount daemon for its mount list and/or
* its exports list and prints them out.
* See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
* and the "Network File System Protocol XXX.."
* for detailed information on the protocol.
*/
int
main(int argc, char **argv)
{
struct exportslist *exp;
struct grouplist *grp;
int estat, rpcs = 0, mntvers = 1;
const char *host;
int ch;
int nbytes;
char strvised[1024 * 4 + 1];

while ((ch = getopt(argc, argv, "adEe3")) != -1)
switch((char)ch) {
case 'a':
if (type == 0) {
type = ALL;
rpcs |= DODUMP;
} else
usage();
break;
case 'd':
if (type == 0) {
type = DIRS;
rpcs |= DODUMP;
} else
usage();
break;
case 'E':
rpcs |= DOPARSABLEEXPORTS;
break;
case 'e':
rpcs |= DOEXPORTS;
break;
case '3':
mntvers = 3;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;

if ((rpcs & DOPARSABLEEXPORTS) != 0) {
if ((rpcs & DOEXPORTS) != 0)
errx(1, "-E cannot be used with -e");
if ((rpcs & DODUMP) != 0)
errx(1, "-E cannot be used with -a or -d");
}

if (argc > 0)
host = *argv;
else
host = "localhost";

if (rpcs == 0)
rpcs = DODUMP;

if (rpcs & DODUMP)
if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
RPCMNT_DUMP, (xdrproc_t)xdr_void, NULL,
(xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
fprintf(stderr, "showmount: Can't do Mountdump rpc: ");
clnt_perrno(estat);
exit(1);
}
if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
RPCMNT_EXPORT, (xdrproc_t)xdr_void, NULL,
(xdrproc_t)xdr_exports, (char *)&exports)) != 0) {
fprintf(stderr, "showmount: Can't do Exports rpc: ");
clnt_perrno(estat);
exit(1);
}

/* Now just print out the results */
if (rpcs & DODUMP) {
switch (type) {
case ALL:
printf("All mount points on %s:\n", host);
break;
case DIRS:
printf("Directories on %s:\n", host);
break;
default:
printf("Hosts on %s:\n", host);
break;
};
print_dump(mntdump);
}
if (rpcs & DOEXPORTS) {
printf("Exports list on %s:\n", host);
exp = exports;
while (exp) {
printf("%-34s ", exp->ex_dirp);
grp = exp->ex_groups;
if (grp == NULL) {
printf("Everyone\n");
} else {
while (grp) {
printf("%s ", grp->gr_name);
grp = grp->gr_next;
}
printf("\n");
}
exp = exp->ex_next;
}
}
if (rpcs & DOPARSABLEEXPORTS) {
exp = exports;
while (exp) {
nbytes = strnvis(strvised, sizeof(strvised),
exp->ex_dirp, VIS_GLOB | VIS_NL);
if (nbytes == -1)
err(1, "strsnvis");
printf("%s\n", strvised);
exp = exp->ex_next;
}
}
exit(0);
}

/*
* tcp_callrpc has the same interface as callrpc, but tries to
* use tcp as transport method in order to handle large replies.
*/

static int
tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
{
CLIENT *client;
struct timeval timeout;
int rval;

if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
(client = clnt_create(host, prognum, versnum, "udp")) == NULL)
return ((int) rpc_createerr.cf_stat);

timeout.tv_sec = 25;
timeout.tv_usec = 0;
rval = (int) clnt_call(client, procnum,
inproc, in,
outproc, out,
timeout);
clnt_destroy(client);
return rval;
}

static void
mountlist_free(struct mountlist *ml)
{
if (ml == NULL)
return;
mountlist_free(ml->ml_left);
mountlist_free(ml->ml_right);
free(ml);
}

/*
* Xdr routine for retrieving the mount dump list
*/
static int
xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
{
struct mountlist *mp, **otp, *tp;
int bool_int, val, val2;
char *strp;

otp = NULL;
*mlp = NULL;
if (!xdr_bool(xdrsp, &bool_int))
return 0;
while (bool_int) {
mp = malloc(sizeof(*mp));
if (mp == NULL)
goto out;
mp->ml_left = mp->ml_right = NULL;
strp = mp->ml_host;
if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN)) {
free(mp);
goto out;
}
strp = mp->ml_dirp;
if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) {
free(mp);
goto out;
}

/*
* Build a binary tree on sorted order of either host or dirp.
* Drop any duplications.
*/
if (*mlp == NULL) {
*mlp = mp;
} else {
tp = *mlp;
while (tp) {
val = strcmp(mp->ml_host, tp->ml_host);
val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
switch (type) {
case ALL:
if (val == 0) {
if (val2 == 0) {
free(mp);
goto next;
}
val = val2;
}
break;
case DIRS:
if (val2 == 0) {
free(mp);
goto next;
}
val = val2;
break;
default:
if (val == 0) {
free(mp);
goto next;
}
break;
};
if (val < 0) {
otp = &tp->ml_left;
tp = tp->ml_left;
} else {
otp = &tp->ml_right;
tp = tp->ml_right;
}
}
*otp = mp;
}
next:
if (!xdr_bool(xdrsp, &bool_int))
goto out;
}
return 1;
out:
mountlist_free(*mlp);
return 0;
}

static void
grouplist_free(struct grouplist *gp)
{
if (gp == NULL)
return;
grouplist_free(gp->gr_next);
free(gp);
}

static void
exportslist_free(struct exportslist *ep)
{
if (ep == NULL)
return;
exportslist_free(ep->ex_next);
grouplist_free(ep->ex_groups);
free(ep);
}

/*
* Xdr routine to retrieve exports list
*/
static int
xdr_exports(XDR *xdrsp, struct exportslist **exp)
{
struct exportslist *ep = NULL;
struct grouplist *gp;
int bool_int, grpbool;
char *strp;

*exp = NULL;
if (!xdr_bool(xdrsp, &bool_int))
return 0;
while (bool_int) {
ep = malloc(sizeof(*ep));
if (ep == NULL)
goto out;
ep->ex_groups = NULL;
strp = ep->ex_dirp;
if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
goto out;
if (!xdr_bool(xdrsp, &grpbool))
goto out;
while (grpbool) {
gp = malloc(sizeof(*gp));
if (gp == NULL)
goto out;
gp->gr_next = ep->ex_groups;
ep->ex_groups = gp;
strp = gp->gr_name;
if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
goto out;
if (!xdr_bool(xdrsp, &grpbool))
goto out;
}
ep->ex_next = *exp;
*exp = ep;
ep = NULL;
if (!xdr_bool(xdrsp, &bool_int))
goto out;
}
return 1;
out:
exportslist_free(ep);
exportslist_free(*exp);
return 0;
}

static void
usage(void)
{

fprintf(stderr, "usage: showmount [-ade3] host\n");
exit(1);
}

/*
* Print the binary tree in inorder so that output is sorted.
*/
static void
print_dump(struct mountlist *mp)
{

if (mp == NULL)
return;
if (mp->ml_left)
print_dump(mp->ml_left);
switch (type) {
case ALL:
printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
break;
case DIRS:
printf("%s\n", mp->ml_dirp);
break;
default:
printf("%s\n", mp->ml_host);
break;
};
if (mp->ml_right)
print_dump(mp->ml_right);
}