NetBSD/sbin/mountd/mountd.c

/*
 * Copyright (c) 1989 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 Regents of the University of California.\n\
 All rights reserved.\n";
#endif not lint

#ifndef lint
static char sccsid[] = "@(#)mountd.c	5.14 (Berkeley) 2/26/91";
static char rcsid[] = "/b/source/CVS/src/sbin/mountd/mountd.c,v 1.4 1993/03/23 00:29:10 cgd Exp";
#endif not lint

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/signal.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <netdb.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <nfs/nfsv2.h>
#include <rpcsvc/mount.h>
#include "pathnames.h"

struct ufid {
	u_short	ufid_len;
	ino_t	ufid_ino;
	long	ufid_gen;
};
/*
 * Structures for keeping the mount list and export list
 */
struct mountlist {
	struct mountlist *ml_next;
	char	ml_host[MNTNAMLEN+1];
	char	ml_dirp[MNTPATHLEN+1];
};

struct exportlist {
	struct exportlist *ex_next;
	struct exportlist *ex_prev;
	struct grouplist *ex_groups;
	int	ex_rootuid;
	int	ex_exflags;
	dev_t	ex_dev;
	char	ex_dirp[MNTPATHLEN+1];
};

struct grouplist {
	struct grouplist *gr_next;
	struct hostent *gr_hp;
};

/* Global defs */
void mntsrv();
int umntall_each(), xdr_fhs(), xdr_mlist(), xdr_dir(), xdr_explist();
void add_mlist(), del_mlist(), get_exportlist(), get_mountlist();
void send_umntall();
struct exportlist exphead;
struct mountlist *mlhead;
char exname[MAXPATHLEN];
int def_rootuid = -2;
int root_only = 1;
extern int errno;

/*
 * Mountd server for NFS mount protocol as described in:
 * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 * The optional arguments are the exports file name
 * default: _PATH_EXPORTS
 * and "-n" to allow nonroot mount.
 */
main(argc, argv)
	int argc;
	char **argv;
{
        FILE *pidfile;
	extern int optind;
	extern char *optarg;
        SVCXPRT *transp;
	int c;
        int sock = 0;
        int proto = 0;
        int from_inetd = 1;
	struct sockaddr_in from;
	int fromlen;

	while ((c = getopt(argc, argv, "n")) != EOF)
		switch (c) {
		case 'n':
			root_only = 0;
			break;
		default:
			fprintf(stderr, "Usage: mountd [-n] [export_file]\n");
			exit(1);
		};
	argc -= optind;
	argv += optind;

	exphead.ex_next = exphead.ex_prev = (struct exportlist *)0;
	mlhead = (struct mountlist *)0;

	if (argc == 1) {
		strncpy(exname, *argv, MAXPATHLEN-1);
		exname[MAXPATHLEN-1] = '\0';
	} else
		strcpy(exname, _PATH_EXPORTS);

        if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
                from_inetd = 0;
                sock = RPC_ANYSOCK;
                proto = IPPROTO_UDP;
        }
        
        if (!from_inetd) {
		daemon(0, 0);
                pmap_unset(MOUNTPROG, MOUNTVERS);
		signal(SIGINT, SIG_IGN);
		signal(SIGQUIT, SIG_IGN);
	}

	openlog("mountd", LOG_PID, LOG_DAEMON);

	if ((transp = svcudp_create(sock)) == NULL) {
		syslog(LOG_ERR, "Can't create socket: %m");
		exit(1);
	}

	if (!svc_register(transp, MOUNTPROG, MOUNTVERS, mntsrv, proto)) {
		syslog(LOG_ERR, "Can't register mount");
		exit(1);
	}

	get_exportlist();
	get_mountlist();

	signal(SIGHUP, get_exportlist);
	signal(SIGTERM, send_umntall);

        pidfile = fopen(_PATH_MOUNTDPID, "w");
        if (pidfile != NULL) {
		fprintf(pidfile, "%d\n", getpid());
		fclose(pidfile);
        }

	svc_run();
	syslog(LOG_ERR, "Mountd died");
	exit(1);
}

/*
 * The mount rpc service
 */
void
mntsrv(rqstp, transp)
	register struct svc_req *rqstp;
	register SVCXPRT *transp;
{
	register struct grouplist *grp;
	register u_long **addrp;
	register struct exportlist *ep;
	nfsv2fh_t nfh;
	struct authunix_parms *ucr;
	struct stat stb;
	struct hostent *hp;
	u_long saddr;
	char dirpath[MNTPATHLEN+1];
	int bad = ENOENT;
	int omask;
	uid_t uid = -2;

	/* Get authorization */
	switch (rqstp->rq_cred.oa_flavor) {
	case AUTH_UNIX:
		ucr = (struct authunix_parms *)rqstp->rq_clntcred;
		uid = ucr->aup_uid;
		break;
	case AUTH_NULL:
	default:
		break;
	}

	saddr = transp->xp_raddr.sin_addr.s_addr;
	hp = (struct hostent *)0;
	switch (rqstp->rq_proc) {
	case NULLPROC:
		if (!svc_sendreply(transp, xdr_void, (caddr_t)0))
			syslog(LOG_ERR, "Can't send reply");
		return;
	case MOUNTPROC_MNT:
		if (uid != 0 && root_only) {
			svcerr_weakauth(transp);
			return;
		}
		if (!svc_getargs(transp, xdr_dir, dirpath)) {
			svcerr_decode(transp);
			return;
		}

		/* Check to see if it's a valid dirpath */
		if (stat(dirpath, &stb) < 0 || (stb.st_mode&S_IFMT) !=
			S_IFDIR) {
			if (!svc_sendreply(transp, xdr_long, (caddr_t)&bad))
				syslog(LOG_ERR, "Can't send reply");
			return;
		}

		/* Check in the exports list */
		omask = sigblock(sigmask(SIGHUP));
		ep = exphead.ex_next;
		while (ep != NULL) {
			if (!strcmp(ep->ex_dirp, dirpath)) {
				grp = ep->ex_groups;
				if (grp == NULL)
					break;

				/* Check for a host match */
				addrp = (u_long **)grp->gr_hp->h_addr_list;
				for (;;) {
					if (**addrp == saddr)
						break;
					if (*++addrp == NULL)
						if (grp = grp->gr_next) {
							addrp = (u_long **)
								grp->gr_hp->h_addr_list;
						} else {
							bad = EACCES;
							if (!svc_sendreply(transp, xdr_long, (caddr_t)&bad))
								syslog(LOG_ERR, "Can't send reply");
							sigsetmask(omask);
							return;
						}
				}
				hp = grp->gr_hp;
				break;
			}
			ep = ep->ex_next;
		}
		sigsetmask(omask);
		if (ep == NULL) {
			bad = EACCES;
			if (!svc_sendreply(transp, xdr_long, (caddr_t)&bad))
				syslog(LOG_ERR, "Can't send reply");
			return;
		}

		/* Get the file handle */
		bzero((caddr_t)&nfh, sizeof(nfh));
		if (getfh(dirpath, (fhandle_t *)&nfh) < 0) {
			bad = errno;
			if (!svc_sendreply(transp, xdr_long, (caddr_t)&bad))
				syslog(LOG_ERR, "Can't send reply");
			return;
		}
		if (!svc_sendreply(transp, xdr_fhs, (caddr_t)&nfh))
			syslog(LOG_ERR, "Can't send reply");
		if (hp == NULL)
			hp = gethostbyaddr((caddr_t)&saddr, sizeof(saddr), AF_INET);
		if (hp)
			add_mlist(hp->h_name, dirpath);
		return;
	case MOUNTPROC_DUMP:
		if (!svc_sendreply(transp, xdr_mlist, (caddr_t)0))
			syslog(LOG_ERR, "Can't send reply");
		return;
	case MOUNTPROC_UMNT:
		if (uid != 0 && root_only) {
			svcerr_weakauth(transp);
			return;
		}
		if (!svc_getargs(transp, xdr_dir, dirpath)) {
			svcerr_decode(transp);
			return;
		}
		if (!svc_sendreply(transp, xdr_void, (caddr_t)0))
			syslog(LOG_ERR, "Can't send reply");
		hp = gethostbyaddr((caddr_t)&saddr, sizeof(saddr), AF_INET);
		if (hp)
			del_mlist(hp->h_name, dirpath);
		return;
	case MOUNTPROC_UMNTALL:
		if (uid != 0 && root_only) {
			svcerr_weakauth(transp);
			return;
		}
		if (!svc_sendreply(transp, xdr_void, (caddr_t)0))
			syslog(LOG_ERR, "Can't send reply");
		hp = gethostbyaddr((caddr_t)&saddr, sizeof(saddr), AF_INET);
		if (hp)
			del_mlist(hp->h_name, (char *)0);
		return;
	case MOUNTPROC_EXPORT:
        case MOUNTPROC_EXPORTALL:
                get_exportlist();
		if (!svc_sendreply(transp, xdr_explist, (caddr_t)exphead.ex_next))
			syslog(LOG_ERR, "Can't send reply");
		return;
	default:
		svcerr_noproc(transp);
		return;
	}
}

/*
 * Xdr conversion for a dirpath string
 */
xdr_dir(xdrsp, dirp)
	XDR *xdrsp;
	char *dirp;
{
	return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
}

/*
 * Xdr routine to generate fhstatus
 */
xdr_fhs(xdrsp, nfh)
	XDR *xdrsp;
	nfsv2fh_t *nfh;
{
	long ok = 0;

	if (!xdr_long(xdrsp, &ok))
		return (0);
	return (xdr_opaque(xdrsp, (caddr_t)nfh, NFSX_FH));
}

xdr_mlist(xdrsp, cp)
	XDR *xdrsp;
	caddr_t cp;
{
	register struct mountlist *mlp;
	int true = 1;
	int false = 0;
	char *strp;

	mlp = mlhead;
	while (mlp) {
		if (!xdr_bool(xdrsp, &true))
			return (0);
		strp = &mlp->ml_host[0];
		if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
			return (0);
		strp = &mlp->ml_dirp[0];
		if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
			return (0);
		mlp = mlp->ml_next;
	}
	if (!xdr_bool(xdrsp, &false))
		return (0);
	return (1);
}

/*
 * Xdr conversion for export list
 */
xdr_explist(xdrsp, cp)
	XDR *xdrsp;
	caddr_t cp;
{
	register struct exportlist *ep = (struct exportlist *)cp;
	register struct grouplist *grp;
	int true = 1;
	int false = 0;
	char *strp;
	int omask;

	omask = sigblock(sigmask(SIGHUP));
	while (ep != NULL) {
		if (!xdr_bool(xdrsp, &true))
			goto errout;
		strp = &ep->ex_dirp[0];
		if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
			goto errout;
		grp = ep->ex_groups;
		while (grp != NULL) {
			if (!xdr_bool(xdrsp, &true))
				goto errout;
			strp = grp->gr_hp->h_name;
			if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
				goto errout;
			grp = grp->gr_next;
		}
		if (!xdr_bool(xdrsp, &false))
			goto errout;
		ep = ep->ex_next;
	}
	sigsetmask(omask);
	if (!xdr_bool(xdrsp, &false))
		return (0);
	return (1);
errout:
	sigsetmask(omask);
	return (0);
}

#define LINESIZ	10240
char line[LINESIZ];

/*
 * Get the export list
 */

void
get_exportlist()
{
	register struct hostent *hp, *nhp;
	register char **addrp, **naddrp;
	register int i;
	register struct grouplist *grp;
	register struct exportlist *ep, *ep2;
	struct statfs stfsbuf;
	struct ufs_args args;
	struct stat sb;
	FILE *inf;
	char *cp, *endcp;
	char savedc;
	int len, dirplen;
	int rootuid, exflags;
	u_long saddr;
	struct exportlist *fep;
        static int first = 0;
        static struct stat last_exportstat;
        
        /*
         * Check if the file has changed
         */
        if (first++) {
                if (stat(exname, &sb) < 0) {
                        syslog(LOG_ERR, "stat of export file %s failed. %m", exname);
                        ep = exphead.ex_next;
                        while (ep != NULL) {
                                ep2 = ep;
                                ep = ep->ex_next;
                                free_exp(ep2);
                        }
                        return;
                }
                if (last_exportstat.st_mtime == sb.st_mtime)
                        return;
        }
        
	/*
	 * First, get rid of the old list
	 */
	ep = exphead.ex_next;
	while (ep != NULL) {
		ep2 = ep;
		ep = ep->ex_next;
		free_exp(ep2);
	}

	/*
	 * Read in the exports file and build the list, calling
	 * exportfs() as we go along
	 */
	exphead.ex_next = exphead.ex_prev = (struct exportlist *)0;
	if ((inf = fopen(exname, "r")) == NULL) {
		syslog(LOG_ERR, "Can't open %s", exname);
		exit(2);
	}
	while (fgets(line, LINESIZ, inf)) {
		exflags = MNT_EXPORTED;
		rootuid = def_rootuid;
		cp = line;
		nextfield(&cp, &endcp);

		/*
		 * Get file system devno and see if an entry for this
		 * file system already exists.
		 */
		savedc = *endcp;
		*endcp = '\0';
		if (stat(cp, &sb) < 0 || (sb.st_mode & S_IFMT) != S_IFDIR) {
			syslog(LOG_ERR,
			    "Bad Exports File, %s: %s, mountd Failed",
			    cp, "Not a directory");
			exit(2);
		}
		fep = (struct exportlist *)0;
		ep = exphead.ex_next;
		while (ep) {
			if (ep->ex_dev == sb.st_dev) {
				fep = ep;
				break;
			}
			ep = ep->ex_next;
		}
		*endcp = savedc;

		/*
		 * Create new exports list entry
		 */
		len = endcp-cp;
		if (len <= MNTPATHLEN && len > 0) {
			ep = (struct exportlist *)malloc(sizeof(*ep));
			if (ep == NULL)
				goto err;
			ep->ex_next = ep->ex_prev = (struct exportlist *)0;
			ep->ex_groups = (struct grouplist *)0;
			bcopy(cp, ep->ex_dirp, len);
			ep->ex_dirp[len] = '\0';
			dirplen = len;
		} else {
			syslog(LOG_ERR, "Bad Exports File, mountd Failed");
			exit(2);
		}
		cp = endcp;
		nextfield(&cp, &endcp);
		len = endcp-cp;
		while (len > 0) {
			savedc = *endcp;
			*endcp = '\0';
			if (len > MNTNAMLEN)
				goto more;
			if (*cp == '-') {
				do_opt(cp + 1, fep, ep, &exflags, &rootuid);
				goto more;
			}
			if (isdigit(*cp)) {
				saddr = inet_addr(cp);
				if (saddr == -1 ||
				    (hp = gethostbyaddr((caddr_t)&saddr,
				     sizeof(saddr), AF_INET)) == NULL) {
					syslog(LOG_ERR,
					    "Bad Exports File, %s: %s", cp,
					    "Gethostbyaddr failed, ignored");
					goto more;
				}
			} else if ((hp = gethostbyname(cp)) == NULL) {
				syslog(LOG_ERR, "Bad Exports File, %s: %s",
				    cp, "Gethostbyname failed, ignored");
				goto more;
			}
			grp = (struct grouplist *)
				malloc(sizeof(struct grouplist));
			if (grp == NULL)
				goto err;
			nhp = grp->gr_hp = (struct hostent *)
				malloc(sizeof(struct hostent));
			if (nhp == NULL)
				goto err;
			bcopy((caddr_t)hp, (caddr_t)nhp,
				sizeof(struct hostent));
			i = strlen(hp->h_name)+1;
			nhp->h_name = (char *)malloc(i);
			if (nhp->h_name == NULL)
				goto err;
			bcopy(hp->h_name, nhp->h_name, i);
			addrp = hp->h_addr_list;
			i = 1;
			while (*addrp++)
				i++;
			naddrp = nhp->h_addr_list = (char **)
				malloc(i*sizeof(char *));
			if (naddrp == NULL)
				goto err;
			addrp = hp->h_addr_list;
			while (*addrp) {
				*naddrp = (char *)
				    malloc(hp->h_length);
				if (*naddrp == NULL)
				    goto err;
				bcopy(*addrp, *naddrp,
					hp->h_length);
				addrp++;
				naddrp++;
			}
			*naddrp = (char *)0;
			grp->gr_next = ep->ex_groups;
			ep->ex_groups = grp;
		more:
			cp = endcp;
			*cp = savedc;
			nextfield(&cp, &endcp);
			len = endcp - cp;
		}
		if (fep == NULL) {
			args.fspec = 0;
			args.exflags = exflags;
			args.exroot = rootuid;
			cp = (char *)0;
			while (statfs(ep->ex_dirp, &stfsbuf) < 0 ||
			       mount(MOUNT_UFS, ep->ex_dirp,
				     stfsbuf.f_flags|MNT_UPDATE, &args) < 0) {
/* 08 Sep 92*/			if (cp)
					*cp-- = savedc;
				else
					cp = ep->ex_dirp + dirplen - 1;
#ifdef OMIT
				if (cp == NULL)
					cp = ep->ex_dirp + dirplen - 1;
				else
					*cp = savedc;
#endif	/* OMIT*/
				/* back up over the last component */
				while (*cp == '/' && cp > ep->ex_dirp)
					cp--;
/* 08 Sep 92*/			while (cp > ep->ex_dirp && *(cp - 1) != '/')
					cp--;
				if (cp == ep->ex_dirp) {
					syslog(LOG_WARNING,
					      "Can't export %s", ep->ex_dirp);
					free_exp(ep);
					goto nextline;
				}
				savedc = *cp;
				*cp = '\0';
			}
			if (cp)
				*cp = savedc;
			ep->ex_rootuid = rootuid;
			ep->ex_exflags = exflags;
		} else {
			ep->ex_rootuid = fep->ex_rootuid;
			ep->ex_exflags = fep->ex_exflags;
		}
		ep->ex_dev = sb.st_dev;
		ep->ex_next = exphead.ex_next;
		ep->ex_prev = &exphead;
		if (ep->ex_next != NULL)
			ep->ex_next->ex_prev = ep;
		exphead.ex_next = ep;
nextline:
		;
	}
	fclose(inf);
	return;
err:
	syslog(LOG_ERR, "No more memory: mountd Failed");
	exit(2);
}

/*
 * Parse out the next white space separated field
 */
nextfield(cp, endcp)
	char **cp;
	char **endcp;
{
	register char *p;

	p = *cp;
	while (*p == ' ' || *p == '\t')
		p++;
	if (*p == '\n' || *p == '\0') {
		*cp = *endcp = p;
		return;
	}
	*cp = p++;
	while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
		p++;
	*endcp = p;
}

/*
 * Parse the option string
 */
do_opt(cpopt, fep, ep, exflagsp, rootuidp)
	register char *cpopt;
	struct exportlist *fep, *ep;
	int *exflagsp, *rootuidp;
{
	register char *cpoptarg, *cpoptend;

	while (cpopt && *cpopt) {
		if (cpoptend = index(cpopt, ','))
			*cpoptend++ = '\0';
		if (cpoptarg = index(cpopt, '='))
			*cpoptarg++ = '\0';
		if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
			if (fep && (fep->ex_exflags & MNT_EXRDONLY) == 0)
				syslog(LOG_WARNING, "ro failed for %s",
				       ep->ex_dirp);
			else
				*exflagsp |= MNT_EXRDONLY;
		} else if (!strcmp(cpopt, "root") || !strcmp(cpopt, "r")) {
			if (cpoptarg && isdigit(*cpoptarg)) {
				*rootuidp = atoi(cpoptarg);
				if (fep && fep->ex_rootuid != *rootuidp)
					syslog(LOG_WARNING,
					       "uid failed for %s",
					       ep->ex_dirp);
			} else
				syslog(LOG_WARNING,
				       "uid failed for %s",
				       ep->ex_dirp);
		} else
			syslog(LOG_WARNING, "opt %s ignored for %s", cpopt,
			       ep->ex_dirp);
		cpopt = cpoptend;
	}
}

#define	STRSIZ	(MNTNAMLEN+MNTPATHLEN+50)
/*
 * Routines that maintain the remote mounttab
 */
void get_mountlist()
{
	register struct mountlist *mlp, **mlpp;
	register char *eos, *dirp;
	int len;
	char str[STRSIZ];
	FILE *mlfile;

	if (((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) &&
	    ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL)) {
		syslog(LOG_WARNING, "Can't open %s", _PATH_RMOUNTLIST);
		return;
	}
	mlpp = &mlhead;
	while (fgets(str, STRSIZ, mlfile) != NULL) {
		if ((dirp = index(str, '\t')) == NULL &&
		    (dirp = index(str, ' ')) == NULL)
			continue;
		mlp = (struct mountlist *)malloc(sizeof (*mlp));
		len = dirp-str;
		if (len > MNTNAMLEN)
			len = MNTNAMLEN;
		bcopy(str, mlp->ml_host, len);
		mlp->ml_host[len] = '\0';
		while (*dirp == '\t' || *dirp == ' ')
			dirp++;
		if ((eos = index(dirp, '\t')) == NULL &&
		    (eos = index(dirp, ' ')) == NULL &&
		    (eos = index(dirp, '\n')) == NULL)
			len = strlen(dirp);
		else
			len = eos-dirp;
		if (len > MNTPATHLEN)
			len = MNTPATHLEN;
		bcopy(dirp, mlp->ml_dirp, len);
		mlp->ml_dirp[len] = '\0';
		mlp->ml_next = (struct mountlist *)0;
		*mlpp = mlp;
		mlpp = &mlp->ml_next;
	}
	fclose(mlfile);
}

void del_mlist(hostp, dirp)
	register char *hostp, *dirp;
{
	register struct mountlist *mlp, **mlpp;
	FILE *mlfile;
	int fnd = 0;

	mlpp = &mlhead;
	mlp = mlhead;
	while (mlp) {
		if (!strcmp(mlp->ml_host, hostp) &&
		    (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
			fnd = 1;
			*mlpp = mlp->ml_next;
			free((caddr_t)mlp);
		}
		mlpp = &mlp->ml_next;
		mlp = mlp->ml_next;
	}
	if (fnd) {
		if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
			syslog(LOG_WARNING, "Can't update %s", _PATH_RMOUNTLIST);
			return;
		}
		mlp = mlhead;
		while (mlp) {
			fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
			mlp = mlp->ml_next;
		}
		fclose(mlfile);
	}
}

void add_mlist(hostp, dirp)
	register char *hostp, *dirp;
{
	register struct mountlist *mlp, **mlpp;
	FILE *mlfile;

	mlpp = &mlhead;
	mlp = mlhead;
	while (mlp) {
		if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
			return;
		mlpp = &mlp->ml_next;
		mlp = mlp->ml_next;
	}
	mlp = (struct mountlist *)malloc(sizeof (*mlp));
	strncpy(mlp->ml_host, hostp, MNTNAMLEN);
	mlp->ml_host[MNTNAMLEN] = '\0';
	strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
	mlp->ml_dirp[MNTPATHLEN] = '\0';
	mlp->ml_next = (struct mountlist *)0;
	*mlpp = mlp;
	if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
		syslog(LOG_WARNING, "Can't update %s", _PATH_RMOUNTLIST);
		return;
	}
	fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
	fclose(mlfile);
}

/*
 * This function is called via. SIGTERM when the system is going down.
 * It sends a broadcast RPCMNT_UMNTALL.
 */
void
send_umntall()
{
	(void) clnt_broadcast(MOUNTPROG, MOUNTVERS, MOUNTPROC_UMNTALL,
		xdr_void, (caddr_t)0, xdr_void, (caddr_t)0, umntall_each);
	exit();
}

umntall_each(resultsp, raddr)
	caddr_t resultsp;
	struct sockaddr_in *raddr;
{
	return (1);
}

/*
 * Free up an exports list component
 */
free_exp(ep)
	register struct exportlist *ep;
{
	register struct grouplist *grp;
	register char **addrp;
	struct grouplist *grp2;

	grp = ep->ex_groups;
	while (grp != NULL) {
		addrp = grp->gr_hp->h_addr_list;
		while (*addrp)
			free(*addrp++);
		free((caddr_t)grp->gr_hp->h_addr_list);
		free(grp->gr_hp->h_name);
		free((caddr_t)grp->gr_hp);
		grp2 = grp;
		grp = grp->gr_next;
		free((caddr_t)grp2);
	}
	free((caddr_t)ep);
}