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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: showmount.c,v 1.17 2009/10/27 23:59:43 deraadt Exp $	*/
/*	$NetBSD: showmount.c,v 1.7 1996/05/01 18:14:10 cgd 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/types.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/socketvar.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 <vis.h>

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

#define	DODUMP		0x1
#define	DOEXPORTS	0x2

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;

void	print_dump(struct mountlist *);
void	usage(void);
int	xdr_mntdump(XDR *, struct mountlist **);
int	xdr_exports(XDR *, struct exportslist **);

/*
 * This command queries the NFS mount daemon for it's mount list and/or
 * it's 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;
	struct sockaddr_in clnt_sin;
	struct hostent *hp;
	struct timeval timeout;
	int rpcs = 0, mntvers = 1;
	enum clnt_stat estat;
	CLIENT *client;
	char *host;
	int ch, clnt_sock;

	while ((ch = getopt(argc, argv, "ade3")) != -1)
		switch (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 |= DOEXPORTS;
			break;
		case '3':
			mntvers = 3;
			break;
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

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

	if (rpcs == 0)
		rpcs = DODUMP;

	if ((hp = gethostbyname(host)) == NULL) {
		fprintf(stderr, "showmount: unknown host %s\n", host);
		exit(1);
	}
	bzero(&clnt_sin, sizeof clnt_sin);
	clnt_sin.sin_len = sizeof clnt_sin;
	clnt_sin.sin_family = AF_INET;
	bcopy(hp->h_addr, (char *)&clnt_sin.sin_addr, hp->h_length);
	clnt_sock = RPC_ANYSOCK;
	client = clnttcp_create(&clnt_sin, RPCPROG_MNT, mntvers,
	    &clnt_sock, 0, 0);
	if (client == NULL) {
		clnt_pcreateerror("showmount: clnttcp_create");
		exit(1);
	}
	timeout.tv_sec = 30;
	timeout.tv_usec = 0;

	if (rpcs & DODUMP) {
		estat = clnt_call(client, RPCMNT_DUMP, xdr_void, (char *)0,
		    xdr_mntdump, (char *)&mntdump, timeout);
		if (estat != RPC_SUCCESS) {
			fprintf(stderr, "showmount: Can't do Mountdump rpc: ");
			clnt_perrno(estat);
			exit(1);
		}
	}
	if (rpcs & DOEXPORTS) {
		estat = clnt_call(client, RPCMNT_EXPORT, xdr_void, (char *)0,
		    xdr_exports, (char *)&exports, timeout);
		if (estat != RPC_SUCCESS) {
			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) {
		char	vp[(RPCMNT_PATHLEN+1)*4];
		char	vn[(RPCMNT_NAMELEN+1)*4];

		printf("Exports list on %s:\n", host);
		exp = exports;
		while (exp) {
			strnvis(vp, exp->ex_dirp, sizeof vp, VIS_CSTYLE);
			printf("%-34s ", vp);
			grp = exp->ex_groups;
			if (grp == NULL) {
				printf("Everyone\n");
			} else {
				while (grp) {
					strnvis(vn, grp->gr_name, sizeof vn,
					    VIS_CSTYLE);
					printf("%s ", vn);
					grp = grp->gr_next;
				}
				printf("\n");
			}
			exp = exp->ex_next;
		}
	}

	exit(0);
}

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

	*mlp = (struct mountlist *)0;
	if (!xdr_bool(xdrsp, &bool))
		return (0);
	while (bool) {
		mp = (struct mountlist *)malloc(sizeof(struct mountlist));
		if (mp == NULL)
			return (0);
		mp->ml_left = mp->ml_right = (struct mountlist *)0;
		strp = mp->ml_host;
		if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
			return (0);
		strp = mp->ml_dirp;
		if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
			return (0);

		/*
		 * 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((caddr_t)mp);
							goto next;
						}
						val = val2;
					}
					break;
				case DIRS:
					if (val2 == 0) {
						free((caddr_t)mp);
						goto next;
					}
					val = val2;
					break;
				default:
					if (val == 0) {
						free((caddr_t)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))
			return (0);
	}
	return (1);
}

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

	*exp = (struct exportslist *)0;
	if (!xdr_bool(xdrsp, &bool))
		return (0);
	while (bool) {
		ep = (struct exportslist *)malloc(sizeof(struct exportslist));
		if (ep == NULL)
			return (0);
		ep->ex_groups = (struct grouplist *)0;
		strp = ep->ex_dirp;
		if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
			return (0);
		if (!xdr_bool(xdrsp, &grpbool))
			return (0);
		while (grpbool) {
			gp = (struct grouplist *)malloc(
			    sizeof(struct grouplist));
			if (gp == NULL)
				return (0);
			strp = gp->gr_name;
			if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
				return (0);
			gp->gr_next = ep->ex_groups;
			ep->ex_groups = gp;
			if (!xdr_bool(xdrsp, &grpbool))
				return (0);
		}
		ep->ex_next = *exp;
		*exp = ep;
		if (!xdr_bool(xdrsp, &bool))
			return (0);
	}
	return (1);
}

void
usage(void)
{

	fprintf(stderr, "usage: showmount [-3ade] [host]\n");
	exit(1);
}

/*
 * Print the binary tree in inorder so that output is sorted.
 */
void
print_dump(struct mountlist *mp)
{
	char	vn[(RPCMNT_NAMELEN+1)*4];
	char	vp[(RPCMNT_PATHLEN+1)*4];

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