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NetBSD/usr.sbin/mountd/mountd.c

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/* $NetBSD: mountd.c,v 1.58 1999/11/14 14:37:16 sommerfeld Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Herb Hasler and 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.
*/
/*
* XXX The ISO support can't possibly work..
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)mountd.c 8.15 (Berkeley) 5/1/95";
#else
__RCSID("$NetBSD: mountd.c,v 1.58 1999/11/14 14:37:16 sommerfeld Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <syslog.h>
#include <sys/ucred.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <rpcsvc/mount.h>
#ifdef ISO
#include <netiso/iso.h>
#endif
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsmount.h>
#include <ufs/ufs/ufsmount.h>
#include <isofs/cd9660/cd9660_mount.h>
#include <msdosfs/msdosfsmount.h>
#include <adosfs/adosfs.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <grp.h>
#include <netdb.h>
#include <pwd.h>
#include <netgroup.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netgroup.h>
#include <util.h>
#include "pathnames.h"
#ifdef KERBEROS
#include <kerberosIV/krb.h>
#include "kuid.h"
#endif
#include <stdarg.h>
/*
* Structures for keeping the mount list and export list
*/
struct mountlist {
struct mountlist *ml_next;
char ml_host[RPCMNT_NAMELEN + 1];
char ml_dirp[RPCMNT_PATHLEN + 1];
int ml_flag;/* XXX more flags (same as dp_flag) */
};
struct dirlist {
struct dirlist *dp_left;
struct dirlist *dp_right;
int dp_flag;
struct hostlist *dp_hosts; /* List of hosts this dir exported to */
char dp_dirp[1]; /* Actually malloc'd to size of dir */
};
/* dp_flag bits */
#define DP_DEFSET 0x1
#define DP_HOSTSET 0x2
#define DP_KERB 0x4
#define DP_NORESMNT 0x8
struct exportlist {
struct exportlist *ex_next;
struct dirlist *ex_dirl;
struct dirlist *ex_defdir;
int ex_flag;
fsid_t ex_fs;
char *ex_fsdir;
char *ex_indexfile;
};
/* ex_flag bits */
#define EX_LINKED 0x1
struct netmsk {
u_int32_t nt_net;
u_int32_t nt_mask;
char *nt_name;
};
union grouptypes {
struct hostent *gt_hostent;
struct netmsk gt_net;
#ifdef ISO
struct sockaddr_iso *gt_isoaddr;
#endif
};
struct grouplist {
int gr_type;
union grouptypes gr_ptr;
struct grouplist *gr_next;
};
/* Group types */
#define GT_NULL 0x0
#define GT_HOST 0x1
#define GT_NET 0x2
#define GT_ISO 0x4
struct hostlist {
int ht_flag;/* Uses DP_xx bits */
struct grouplist *ht_grp;
struct hostlist *ht_next;
};
struct fhreturn {
int fhr_flag;
int fhr_vers;
nfsfh_t fhr_fh;
};
/* Global defs */
static char *add_expdir __P((struct dirlist **, char *, int));
static void add_dlist __P((struct dirlist **, struct dirlist *,
struct grouplist *, int));
static void add_mlist __P((char *, char *, int));
static int check_dirpath __P((const char *, size_t, char *));
static int check_options __P((const char *, size_t, struct dirlist *));
static int chk_host __P((struct dirlist *, u_int32_t, int *, int *));
static int del_mlist __P((char *, char *, struct sockaddr *));
static struct dirlist *dirp_search __P((struct dirlist *, char *));
static int do_mount __P((const char *, size_t, struct exportlist *,
struct grouplist *, int, struct ucred *, char *, int, struct statfs *));
static int do_opt __P((const char *, size_t, char **, char **,
struct exportlist *, struct grouplist *, int *, int *, struct ucred *));
static struct exportlist *ex_search __P((fsid_t *));
static int parse_directory __P((const char *, size_t, struct grouplist *,
int, char *, struct exportlist **, struct statfs *));
static int parse_host_netgroup __P((const char *, size_t, struct exportlist *,
struct grouplist *, char *, int *, struct grouplist **));
static struct exportlist *get_exp __P((void));
static void free_dir __P((struct dirlist *));
static void free_exp __P((struct exportlist *));
static void free_grp __P((struct grouplist *));
static void free_host __P((struct hostlist *));
static void get_exportlist __P((int));
static int get_host __P((const char *, size_t, const char *,
struct grouplist *));
static struct hostlist *get_ht __P((void));
static void get_mountlist __P((void));
static int get_net __P((char *, struct netmsk *, int));
static void free_exp_grp __P((struct exportlist *, struct grouplist *));
static struct grouplist *get_grp __P((void));
static void hang_dirp __P((struct dirlist *, struct grouplist *,
struct exportlist *, int));
static void mntsrv __P((struct svc_req *, SVCXPRT *));
static void nextfield __P((char **, char **));
static void parsecred __P((char *, struct ucred *));
static int put_exlist __P((struct dirlist *, XDR *, struct dirlist *, int *));
static int scan_tree __P((struct dirlist *, u_int32_t));
static void send_umntall __P((int));
static int umntall_each __P((caddr_t, struct sockaddr_in *));
static int xdr_dir __P((XDR *, char *));
static int xdr_explist __P((XDR *, caddr_t));
static int xdr_fhs __P((XDR *, caddr_t));
static int xdr_mlist __P((XDR *, caddr_t));
static void *emalloc __P((size_t));
static char *estrdup __P((const char *));
#ifdef ISO
static int get_isoaddr __P((const char *, size_t, char *, struct grouplist *));
#endif
static struct exportlist *exphead;
static struct mountlist *mlhead;
static struct grouplist *grphead;
static char *exname;
static struct ucred def_anon = {
1,
(uid_t) - 2,
(gid_t) - 2,
0,
{}
};
static int opt_flags;
/* Bits for above */
#define OP_MAPROOT 0x001
#define OP_MAPALL 0x002
#define OP_KERB 0x004
#define OP_MASK 0x008
#define OP_NET 0x010
#define OP_ISO 0x020
#define OP_ALLDIRS 0x040
#define OP_NORESPORT 0x080
#define OP_NORESMNT 0x100
static int debug = 0;
#if 0
static void SYSLOG __P((int, const char *,...));
#endif
int main __P((int, char *[]));
/*
* 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
* "-d" to enable debugging
* and "-n" to allow nonroot mount.
*/
int
main(argc, argv)
int argc;
char **argv;
{
SVCXPRT *udptransp, *tcptransp;
int c;
while ((c = getopt(argc, argv, "dnr")) != -1)
switch (c) {
case 'd':
debug = 1;
break;
/* Compatibility */
case 'n':
case 'r':
break;
default:
fprintf(stderr, "Usage: mountd [-d] [export_file]\n");
exit(1);
};
argc -= optind;
argv += optind;
grphead = NULL;
exphead = NULL;
mlhead = NULL;
if (argc == 1)
exname = *argv;
else
exname = _PATH_EXPORTS;
openlog("mountd", LOG_PID, LOG_DAEMON);
if (debug)
(void)fprintf(stderr, "Getting export list.\n");
get_exportlist(0);
if (debug)
(void)fprintf(stderr, "Getting mount list.\n");
get_mountlist();
if (debug)
(void)fprintf(stderr, "Here we go.\n");
if (debug == 0) {
daemon(0, 0);
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
}
(void)signal(SIGHUP, get_exportlist);
(void)signal(SIGTERM, send_umntall);
pidfile(NULL);
if ((udptransp = svcudp_create(RPC_ANYSOCK)) == NULL ||
(tcptransp = svctcp_create(RPC_ANYSOCK, 0, 0)) == NULL) {
syslog(LOG_ERR, "Can't create socket");
exit(1);
}
pmap_unset(RPCPROG_MNT, RPCMNT_VER1);
pmap_unset(RPCPROG_MNT, RPCMNT_VER3);
if (!svc_register(udptransp, RPCPROG_MNT, RPCMNT_VER1, mntsrv,
IPPROTO_UDP) ||
!svc_register(udptransp, RPCPROG_MNT, RPCMNT_VER3, mntsrv,
IPPROTO_UDP) ||
!svc_register(tcptransp, RPCPROG_MNT, RPCMNT_VER1, mntsrv,
IPPROTO_TCP) ||
!svc_register(tcptransp, RPCPROG_MNT, RPCMNT_VER3, mntsrv,
IPPROTO_TCP)) {
syslog(LOG_ERR, "Can't register mount");
exit(1);
}
#ifdef KERBEROS
kuidinit();
#endif
svc_run();
syslog(LOG_ERR, "Mountd died");
exit(1);
}
/*
* The mount rpc service
*/
void
mntsrv(rqstp, transp)
struct svc_req *rqstp;
SVCXPRT *transp;
{
struct exportlist *ep;
struct dirlist *dp;
struct fhreturn fhr;
struct stat stb;
struct statfs fsb;
struct hostent *hp;
struct in_addr saddr;
u_short sport;
char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN];
long bad = EACCES;
int defset, hostset, ret;
sigset_t sighup_mask;
(void)sigemptyset(&sighup_mask);
(void)sigaddset(&sighup_mask, SIGHUP);
saddr = transp->xp_raddr.sin_addr;
sport = ntohs(transp->xp_raddr.sin_port);
hp = NULL;
#ifdef KERBEROS
kuidreset();
#endif
ret = 0;
switch (rqstp->rq_proc) {
case NULLPROC:
if (!svc_sendreply(transp, xdr_void, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
case MOUNTPROC_MNT:
if (!svc_getargs(transp, xdr_dir, rpcpath)) {
svcerr_decode(transp);
return;
}
/*
* Get the real pathname and make sure it is a file or
* directory that exists.
*/
if (realpath(rpcpath, dirpath) == 0 ||
stat(dirpath, &stb) < 0 ||
(!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) ||
statfs(dirpath, &fsb) < 0) {
(void)chdir("/"); /* Just in case realpath doesn't */
if (debug)
(void)fprintf(stderr, "stat failed on %s\n",
dirpath);
if (!svc_sendreply(transp, xdr_long, (caddr_t) &bad))
syslog(LOG_ERR, "Can't send reply");
return;
}
/* Check in the exports list */
(void)sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
ep = ex_search(&fsb.f_fsid);
hostset = defset = 0;
if (ep && (chk_host(ep->ex_defdir, saddr.s_addr, &defset,
&hostset) || ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
chk_host(dp, saddr.s_addr, &defset, &hostset)) ||
(defset && scan_tree(ep->ex_defdir, saddr.s_addr) == 0 &&
scan_tree(ep->ex_dirl, saddr.s_addr) == 0))) {
if (sport >= IPPORT_RESERVED &&
!(hostset & DP_NORESMNT)) {
syslog(LOG_NOTICE,
"Refused mount RPC from host %s port %d",
inet_ntoa(saddr), sport);
svcerr_weakauth(transp);
goto out;
}
if (hostset & DP_HOSTSET)
fhr.fhr_flag = hostset;
else
fhr.fhr_flag = defset;
fhr.fhr_vers = rqstp->rq_vers;
/* Get the file handle */
(void)memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
if (getfh(dirpath, (fhandle_t *) &fhr.fhr_fh) < 0) {
bad = errno;
syslog(LOG_ERR, "Can't get fh for %s", dirpath);
if (!svc_sendreply(transp, xdr_long,
(char *)&bad))
syslog(LOG_ERR, "Can't send reply");
goto out;
}
if (!svc_sendreply(transp, xdr_fhs, (char *) &fhr))
syslog(LOG_ERR, "Can't send reply");
if (hp == NULL)
hp = gethostbyaddr((const char *) &saddr,
sizeof(saddr), AF_INET);
if (hp)
add_mlist(hp->h_name, dirpath, hostset);
else
add_mlist(inet_ntoa(transp->xp_raddr.sin_addr),
dirpath, hostset);
if (debug)
(void)fprintf(stderr, "Mount successful.\n");
} else {
if (!svc_sendreply(transp, xdr_long, (caddr_t) &bad))
syslog(LOG_ERR, "Can't send reply");
}
out:
(void)sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
return;
case MOUNTPROC_DUMP:
if (!svc_sendreply(transp, xdr_mlist, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
case MOUNTPROC_UMNT:
if (!svc_getargs(transp, xdr_dir, dirpath)) {
svcerr_decode(transp);
return;
}
hp = gethostbyaddr((caddr_t) &saddr, sizeof(saddr), AF_INET);
if (hp)
ret = del_mlist(hp->h_name, dirpath,
(struct sockaddr *) &transp->xp_raddr);
ret |= del_mlist(inet_ntoa(transp->xp_raddr.sin_addr), dirpath,
(struct sockaddr *) &transp->xp_raddr);
if (ret) {
svcerr_weakauth(transp);
return;
}
if (!svc_sendreply(transp, xdr_void, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
case MOUNTPROC_UMNTALL:
hp = gethostbyaddr((caddr_t)&saddr, sizeof(saddr), AF_INET);
if (hp)
ret = del_mlist(hp->h_name, NULL,
(struct sockaddr *)&transp->xp_raddr);
ret |= del_mlist(inet_ntoa(transp->xp_raddr.sin_addr),
NULL, (struct sockaddr *)&transp->xp_raddr);
if (ret) {
svcerr_weakauth(transp);
return;
}
if (!svc_sendreply(transp, xdr_void, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
case MOUNTPROC_EXPORT:
case MOUNTPROC_EXPORTALL:
if (!svc_sendreply(transp, xdr_explist, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
#ifdef KERBEROS
case MOUNTPROC_KUIDMAP:
case MOUNTPROC_KUIDUMAP:
case MOUNTPROC_KUIDPURGE:
case MOUNTPROC_KUIDUPURGE:
kuidops(rqstp, transp);
return;
#endif
default:
svcerr_noproc(transp);
return;
}
}
/*
* Xdr conversion for a dirpath string
*/
static int
xdr_dir(xdrsp, dirp)
XDR *xdrsp;
char *dirp;
{
return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
}
/*
* Xdr routine to generate file handle reply
*/
static int
xdr_fhs(xdrsp, cp)
XDR *xdrsp;
caddr_t cp;
{
struct fhreturn *fhrp = (struct fhreturn *) cp;
long ok = 0, len, auth;
if (!xdr_long(xdrsp, &ok))
return (0);
switch (fhrp->fhr_vers) {
case 1:
return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
case 3:
len = NFSX_V3FH;
if (!xdr_long(xdrsp, &len))
return (0);
if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
return (0);
if (fhrp->fhr_flag & DP_KERB)
auth = RPCAUTH_KERB4;
else
auth = RPCAUTH_UNIX;
len = 1;
if (!xdr_long(xdrsp, &len))
return (0);
return (xdr_long(xdrsp, &auth));
};
return (0);
}
int
xdr_mlist(xdrsp, cp)
XDR *xdrsp;
caddr_t cp;
{
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, RPCMNT_NAMELEN))
return (0);
strp = &mlp->ml_dirp[0];
if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
return (0);
mlp = mlp->ml_next;
}
if (!xdr_bool(xdrsp, &false))
return (0);
return (1);
}
/*
* Xdr conversion for export list
*/
int
xdr_explist(xdrsp, cp)
XDR *xdrsp;
caddr_t cp;
{
struct exportlist *ep;
int false = 0;
int putdef;
sigset_t sighup_mask;
(void)sigemptyset(&sighup_mask);
(void)sigaddset(&sighup_mask, SIGHUP);
(void)sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
ep = exphead;
while (ep) {
putdef = 0;
if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, &putdef))
goto errout;
if (ep->ex_defdir && putdef == 0 &&
put_exlist(ep->ex_defdir, xdrsp, NULL, &putdef))
goto errout;
ep = ep->ex_next;
}
(void)sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
if (!xdr_bool(xdrsp, &false))
return (0);
return (1);
errout:
(void)sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
return (0);
}
/*
* Called from xdr_explist() to traverse the tree and export the
* directory paths. Assumes SIGHUP has already been masked.
*/
int
put_exlist(dp, xdrsp, adp, putdefp)
struct dirlist *dp;
XDR *xdrsp;
struct dirlist *adp;
int *putdefp;
{
struct grouplist *grp;
struct hostlist *hp;
int true = 1;
int false = 0;
int gotalldir = 0;
char *strp;
if (dp) {
if (put_exlist(dp->dp_left, xdrsp, adp, putdefp))
return (1);
if (!xdr_bool(xdrsp, &true))
return (1);
strp = dp->dp_dirp;
if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
return (1);
if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
gotalldir = 1;
*putdefp = 1;
}
if ((dp->dp_flag & DP_DEFSET) == 0 &&
(gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
hp = dp->dp_hosts;
while (hp) {
grp = hp->ht_grp;
if (grp->gr_type == GT_HOST) {
if (!xdr_bool(xdrsp, &true))
return (1);
strp = grp->gr_ptr.gt_hostent->h_name;
if (!xdr_string(xdrsp, &strp,
RPCMNT_NAMELEN))
return (1);
} else if (grp->gr_type == GT_NET) {
if (!xdr_bool(xdrsp, &true))
return (1);
strp = grp->gr_ptr.gt_net.nt_name;
if (!xdr_string(xdrsp, &strp,
RPCMNT_NAMELEN))
return (1);
}
hp = hp->ht_next;
if (gotalldir && hp == NULL) {
hp = adp->dp_hosts;
gotalldir = 0;
}
}
}
if (!xdr_bool(xdrsp, &false))
return (1);
if (put_exlist(dp->dp_right, xdrsp, adp, putdefp))
return (1);
}
return (0);
}
static int
parse_host_netgroup(line, lineno, ep, tgrp, cp, has_host, grp)
const char *line;
size_t lineno;
struct exportlist *ep;
struct grouplist *tgrp;
char *cp;
int *has_host;
struct grouplist **grp;
{
const char *hst, *usr, *dom;
int netgrp;
if (ep == NULL) {
syslog(LOG_ERR, "\"%s\", line %ld: No current export",
line, (unsigned long)lineno);
return 0;
}
setnetgrent(cp);
netgrp = getnetgrent(&hst, &usr, &dom);
do {
if (*has_host) {
(*grp)->gr_next = get_grp();
*grp = (*grp)->gr_next;
}
if (netgrp) {
if (hst == NULL) {
syslog(LOG_ERR,
"\"%s\", line %ld: No host in netgroup %s",
line, (unsigned long)lineno, cp);
goto bad;
}
if (get_host(line, lineno, hst, *grp))
goto bad;
} else if (get_host(line, lineno, cp, *grp))
goto bad;
*has_host = TRUE;
} while (netgrp && getnetgrent(&hst, &usr, &dom));
endnetgrent();
return 1;
bad:
endnetgrent();
return 0;
}
static int
parse_directory(line, lineno, tgrp, got_nondir, cp, ep, fsp)
const char *line;
size_t lineno;
struct grouplist *tgrp;
int got_nondir;
char *cp;
struct exportlist **ep;
struct statfs *fsp;
{
if (!check_dirpath(line, lineno, cp))
return 0;
if (statfs(cp, fsp) == -1) {
syslog(LOG_ERR, "\"%s\", line %ld: statfs for `%s' failed: %m",
line, (unsigned long)lineno, cp);
return 0;
}
if (got_nondir) {
syslog(LOG_ERR,
"\"%s\", line %ld: Directories must precede files",
line, (unsigned long)lineno);
return 0;
}
if (*ep) {
if ((*ep)->ex_fs.val[0] != fsp->f_fsid.val[0] ||
(*ep)->ex_fs.val[1] != fsp->f_fsid.val[1]) {
syslog(LOG_ERR,
"\"%s\", line %ld: filesystem ids disagree",
line, (unsigned long)lineno);
return 0;
}
} else {
/*
* See if this directory is already
* in the list.
*/
*ep = ex_search(&fsp->f_fsid);
if (*ep == NULL) {
*ep = get_exp();
(*ep)->ex_fs = fsp->f_fsid;
(*ep)->ex_fsdir = estrdup(fsp->f_mntonname);
if (debug)
(void)fprintf(stderr,
"Making new ep fs=0x%x,0x%x\n",
fsp->f_fsid.val[0], fsp->f_fsid.val[1]);
} else {
if (debug)
(void)fprintf(stderr,
"Found ep fs=0x%x,0x%x\n",
fsp->f_fsid.val[0], fsp->f_fsid.val[1]);
}
}
return 1;
}
/*
* Get the export list
*/
/* ARGSUSED */
void
get_exportlist(n)
int n;
{
struct exportlist *ep, *ep2;
struct grouplist *grp, *tgrp;
struct exportlist **epp;
struct dirlist *dirhead;
struct statfs fsb, *fsp;
struct hostent *hpe;
struct ucred anon;
char *cp, *endcp, *dirp, savedc;
int has_host, exflags, got_nondir, dirplen, num, i;
FILE *exp_file;
char *line;
size_t lineno = 0, len;
/*
* First, get rid of the old list
*/
ep = exphead;
while (ep) {
ep2 = ep;
ep = ep->ex_next;
free_exp(ep2);
}
exphead = NULL;
dirp = NULL;
dirplen = 0;
grp = grphead;
while (grp) {
tgrp = grp;
grp = grp->gr_next;
free_grp(tgrp);
}
grphead = NULL;
/*
* save off the current export lists for later
*/
num = getmntinfo(&fsp, MNT_NOWAIT);
/*
* Read in the exports file and build the list, calling
* mount() as we go along to push the export rules into the kernel.
*/
if ((exp_file = fopen(exname, "r")) == NULL) {
syslog(LOG_ERR, "Can't open %s: %m", exname);
exit(2);
}
dirhead = NULL;
while ((line = fparseln(exp_file, &len, &lineno, NULL, 0)) != NULL) {
if (debug)
(void)fprintf(stderr, "Got line %s\n", line);
cp = line;
nextfield(&cp, &endcp);
if (cp == endcp)
continue; /* skip empty line */
/*
* Set defaults.
*/
has_host = FALSE;
anon = def_anon;
exflags = MNT_EXPORTED;
got_nondir = 0;
opt_flags = 0;
ep = NULL;
/*
* Create new exports list entry
*/
len = endcp - cp;
tgrp = grp = get_grp();
while (len > 0) {
if (len > RPCMNT_NAMELEN) {
*endcp = '\0';
syslog(LOG_ERR,
"\"%s\", line %ld: name `%s' is too long",
line, (unsigned long)lineno, cp);
goto badline;
}
switch (*cp) {
case '-':
/*
* Option
*/
if (ep == NULL) {
syslog(LOG_ERR,
"\"%s\", line %ld: No current export list",
line, (unsigned long)lineno);
goto badline;
}
if (debug)
(void)fprintf(stderr, "doing opt %s\n",
cp);
got_nondir = 1;
if (do_opt(line, lineno, &cp, &endcp, ep, grp,
&has_host, &exflags, &anon))
goto badline;
break;
case '/':
/*
* Directory
*/
savedc = *endcp;
*endcp = '\0';
if (!parse_directory(line, lineno, tgrp,
got_nondir, cp, &ep, &fsb))
goto badline;
/*
* Add dirpath to export mount point.
*/
dirp = add_expdir(&dirhead, cp, len);
dirplen = len;
*endcp = savedc;
break;
default:
/*
* Host or netgroup.
*/
savedc = *endcp;
*endcp = '\0';
if (!parse_host_netgroup(line, lineno, ep,
tgrp, cp, &has_host, &grp))
goto badline;
got_nondir = 1;
*endcp = savedc;
break;
}
cp = endcp;
nextfield(&cp, &endcp);
len = endcp - cp;
}
if (check_options(line, lineno, dirhead))
goto badline;
if (!has_host) {
grp->gr_type = GT_HOST;
if (debug)
(void)fprintf(stderr,
"Adding a default entry\n");
/* add a default group and make the grp list NULL */
hpe = emalloc(sizeof(struct hostent));
hpe->h_name = estrdup("Default");
hpe->h_addrtype = AF_INET;
hpe->h_length = sizeof(u_int32_t);
hpe->h_addr_list = NULL;
grp->gr_ptr.gt_hostent = hpe;
} else if ((opt_flags & OP_NET) && tgrp->gr_next) {
/*
* Don't allow a network export coincide with a list of
* host(s) on the same line.
*/
syslog(LOG_ERR,
"\"%s\", line %ld: Mixed exporting of networks and hosts is disallowed",
line, (unsigned long)lineno);
goto badline;
}
/*
* Loop through hosts, pushing the exports into the kernel.
* After loop, tgrp points to the start of the list and
* grp points to the last entry in the list.
*/
grp = tgrp;
do {
if (do_mount(line, lineno, ep, grp, exflags, &anon,
dirp, dirplen, &fsb))
goto badline;
} while (grp->gr_next && (grp = grp->gr_next));
/*
* Success. Update the data structures.
*/
if (has_host) {
hang_dirp(dirhead, tgrp, ep, opt_flags);
grp->gr_next = grphead;
grphead = tgrp;
} else {
hang_dirp(dirhead, NULL, ep, opt_flags);
free_grp(grp);
}
dirhead = NULL;
if ((ep->ex_flag & EX_LINKED) == 0) {
ep2 = exphead;
epp = &exphead;
/*
* Insert in the list in alphabetical order.
*/
while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
epp = &ep2->ex_next;
ep2 = ep2->ex_next;
}
if (ep2)
ep->ex_next = ep2;
*epp = ep;
ep->ex_flag |= EX_LINKED;
}
goto nextline;
badline:
free_exp_grp(ep, grp);
nextline:
if (dirhead) {
free_dir(dirhead);
dirhead = NULL;
}
free(line);
}
(void)fclose(exp_file);
/*
* Ok, remove any filesystems that existed before that should
* not be there anymore.
*/
/*
* XXX: Should know how to handle all local exportable file systems
* instead of just MOUNT_FFS.
*/
for (i = 0; i < num; i++, fsp++) {
union {
struct ufs_args ua;
struct iso_args ia;
struct mfs_args ma;
struct msdosfs_args da;
struct adosfs_args aa;
} targs;
if (debug)
(void)fprintf(stderr,
"seeing if we want to delete %s.\n",
fsp->f_mntonname);
/*
* If we can find it in our internal list, we do not
* want to delete it from the kernel.
*/
if (ex_search(&fsp->f_fsid))
continue;
if (!strncmp(fsp->f_fstypename, MOUNT_MFS, MFSNAMELEN) ||
!strncmp(fsp->f_fstypename, MOUNT_FFS, MFSNAMELEN) ||
!strncmp(fsp->f_fstypename, MOUNT_EXT2FS, MFSNAMELEN) ||
!strncmp(fsp->f_fstypename, MOUNT_MSDOS, MFSNAMELEN) ||
!strncmp(fsp->f_fstypename, MOUNT_ADOSFS, MFSNAMELEN) ||
!strncmp(fsp->f_fstypename, MOUNT_NULL, MFSNAMELEN) ||
!strncmp(fsp->f_fstypename, MOUNT_UMAP, MFSNAMELEN) ||
!strncmp(fsp->f_fstypename, MOUNT_UNION, MFSNAMELEN) ||
!strncmp(fsp->f_fstypename, MOUNT_CD9660, MFSNAMELEN) ||
!strncmp(fsp->f_fstypename, MOUNT_NTFS, MFSNAMELEN)) {
if (debug)
(void)fprintf(stderr,
"Deleting export for mount %s.\n",
fsp->f_mntonname);
bzero((char *) &targs, sizeof(targs));
targs.ua.fspec = NULL;
targs.ua.export.ex_flags = MNT_DELEXPORT;
if (mount(fsp->f_fstypename, fsp->f_mntonname,
fsp->f_flags | MNT_UPDATE, &targs) == -1)
syslog(LOG_ERR, "Can't delete exports for %s",
fsp->f_mntonname);
}
}
}
/*
* Allocate an export list element
*/
static struct exportlist *
get_exp()
{
struct exportlist *ep;
ep = emalloc(sizeof(struct exportlist));
(void)memset(ep, 0, sizeof(struct exportlist));
return (ep);
}
/*
* Allocate a group list element
*/
static struct grouplist *
get_grp()
{
struct grouplist *gp;
gp = emalloc(sizeof(struct grouplist));
(void)memset(gp, 0, sizeof(struct grouplist));
return (gp);
}
/*
* Clean up upon an error in get_exportlist().
*/
static void
free_exp_grp(ep, grp)
struct exportlist *ep;
struct grouplist *grp;
{
struct grouplist *tgrp;
if (ep && (ep->ex_flag & EX_LINKED) == 0)
free_exp(ep);
while (grp) {
tgrp = grp;
grp = grp->gr_next;
free_grp(tgrp);
}
}
/*
* Search the export list for a matching fs.
*/
static struct exportlist *
ex_search(fsid)
fsid_t *fsid;
{
struct exportlist *ep;
ep = exphead;
while (ep) {
if (ep->ex_fs.val[0] == fsid->val[0] &&
ep->ex_fs.val[1] == fsid->val[1])
return (ep);
ep = ep->ex_next;
}
return (ep);
}
/*
* Add a directory path to the list.
*/
static char *
add_expdir(dpp, cp, len)
struct dirlist **dpp;
char *cp;
int len;
{
struct dirlist *dp;
dp = emalloc(sizeof(struct dirlist) + len);
dp->dp_left = *dpp;
dp->dp_right = NULL;
dp->dp_flag = 0;
dp->dp_hosts = NULL;
(void)strcpy(dp->dp_dirp, cp);
*dpp = dp;
return (dp->dp_dirp);
}
/*
* Hang the dir list element off the dirpath binary tree as required
* and update the entry for host.
*/
void
hang_dirp(dp, grp, ep, flags)
struct dirlist *dp;
struct grouplist *grp;
struct exportlist *ep;
int flags;
{
struct hostlist *hp;
struct dirlist *dp2;
if (flags & OP_ALLDIRS) {
if (ep->ex_defdir)
free(dp);
else
ep->ex_defdir = dp;
if (grp == NULL) {
ep->ex_defdir->dp_flag |= DP_DEFSET;
if (flags & OP_KERB)
ep->ex_defdir->dp_flag |= DP_KERB;
if (flags & OP_NORESMNT)
ep->ex_defdir->dp_flag |= DP_NORESMNT;
} else
while (grp) {
hp = get_ht();
if (flags & OP_KERB)
hp->ht_flag |= DP_KERB;
if (flags & OP_NORESMNT)
hp->ht_flag |= DP_NORESMNT;
hp->ht_grp = grp;
hp->ht_next = ep->ex_defdir->dp_hosts;
ep->ex_defdir->dp_hosts = hp;
grp = grp->gr_next;
}
} else {
/*
* Loop throught the directories adding them to the tree.
*/
while (dp) {
dp2 = dp->dp_left;
add_dlist(&ep->ex_dirl, dp, grp, flags);
dp = dp2;
}
}
}
/*
* Traverse the binary tree either updating a node that is already there
* for the new directory or adding the new node.
*/
static void
add_dlist(dpp, newdp, grp, flags)
struct dirlist **dpp;
struct dirlist *newdp;
struct grouplist *grp;
int flags;
{
struct dirlist *dp;
struct hostlist *hp;
int cmp;
dp = *dpp;
if (dp) {
cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
if (cmp > 0) {
add_dlist(&dp->dp_left, newdp, grp, flags);
return;
} else if (cmp < 0) {
add_dlist(&dp->dp_right, newdp, grp, flags);
return;
} else
free(newdp);
} else {
dp = newdp;
dp->dp_left = NULL;
*dpp = dp;
}
if (grp) {
/*
* Hang all of the host(s) off of the directory point.
*/
do {
hp = get_ht();
if (flags & OP_KERB)
hp->ht_flag |= DP_KERB;
if (flags & OP_NORESMNT)
hp->ht_flag |= DP_NORESMNT;
hp->ht_grp = grp;
hp->ht_next = dp->dp_hosts;
dp->dp_hosts = hp;
grp = grp->gr_next;
} while (grp);
} else {
dp->dp_flag |= DP_DEFSET;
if (flags & OP_KERB)
dp->dp_flag |= DP_KERB;
if (flags & OP_NORESMNT)
dp->dp_flag |= DP_NORESMNT;
}
}
/*
* Search for a dirpath on the export point.
*/
static struct dirlist *
dirp_search(dp, dirp)
struct dirlist *dp;
char *dirp;
{
int cmp;
if (dp) {
cmp = strcmp(dp->dp_dirp, dirp);
if (cmp > 0)
return (dirp_search(dp->dp_left, dirp));
else if (cmp < 0)
return (dirp_search(dp->dp_right, dirp));
else
return (dp);
}
return (dp);
}
/*
* Scan for a host match in a directory tree.
*/
static int
chk_host(dp, saddr, defsetp, hostsetp)
struct dirlist *dp;
u_int32_t saddr;
int *defsetp;
int *hostsetp;
{
struct hostlist *hp;
struct grouplist *grp;
u_int32_t **addrp;
if (dp) {
if (dp->dp_flag & DP_DEFSET)
*defsetp = dp->dp_flag;
hp = dp->dp_hosts;
while (hp) {
grp = hp->ht_grp;
switch (grp->gr_type) {
case GT_HOST:
addrp = (u_int32_t **)
grp->gr_ptr.gt_hostent->h_addr_list;
for (; *addrp; addrp++) {
if (**addrp != saddr)
continue;
*hostsetp = (hp->ht_flag | DP_HOSTSET);
return (1);
}
break;
case GT_NET:
if ((saddr & grp->gr_ptr.gt_net.nt_mask) ==
grp->gr_ptr.gt_net.nt_net) {
*hostsetp = (hp->ht_flag | DP_HOSTSET);
return (1);
}
break;
};
hp = hp->ht_next;
}
}
return (0);
}
/*
* Scan tree for a host that matches the address.
*/
static int
scan_tree(dp, saddr)
struct dirlist *dp;
u_int32_t saddr;
{
int defset, hostset;
if (dp) {
if (scan_tree(dp->dp_left, saddr))
return (1);
if (chk_host(dp, saddr, &defset, &hostset))
return (1);
if (scan_tree(dp->dp_right, saddr))
return (1);
}
return (0);
}
/*
* Traverse the dirlist tree and free it up.
*/
static void
free_dir(dp)
struct dirlist *dp;
{
if (dp) {
free_dir(dp->dp_left);
free_dir(dp->dp_right);
free_host(dp->dp_hosts);
free(dp);
}
}
/*
* Parse the option string and update fields.
* Option arguments may either be -<option>=<value> or
* -<option> <value>
*/
static int
do_opt(line, lineno, cpp, endcpp, ep, grp, has_hostp, exflagsp, cr)
const char *line;
size_t lineno;
char **cpp, **endcpp;
struct exportlist *ep;
struct grouplist *grp;
int *has_hostp;
int *exflagsp;
struct ucred *cr;
{
char *cpoptarg, *cpoptend;
char *cp, *endcp, *cpopt, savedc, savedc2;
int allflag, usedarg;
cpopt = *cpp;
cpopt++;
cp = *endcpp;
savedc = *cp;
*cp = '\0';
while (cpopt && *cpopt) {
allflag = 1;
usedarg = -2;
savedc2 = '\0';
if ((cpoptend = strchr(cpopt, ',')) != NULL) {
*cpoptend++ = '\0';
if ((cpoptarg = strchr(cpopt, '=')) != NULL)
*cpoptarg++ = '\0';
} else {
if ((cpoptarg = strchr(cpopt, '=')) != NULL)
*cpoptarg++ = '\0';
else {
*cp = savedc;
nextfield(&cp, &endcp);
**endcpp = '\0';
if (endcp > cp && *cp != '-') {
cpoptarg = cp;
savedc2 = *endcp;
*endcp = '\0';
usedarg = 0;
}
}
}
if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
*exflagsp |= MNT_EXRDONLY;
} else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
!(allflag = strcmp(cpopt, "mapall")) ||
!strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
usedarg++;
parsecred(cpoptarg, cr);
if (allflag == 0) {
*exflagsp |= MNT_EXPORTANON;
opt_flags |= OP_MAPALL;
} else
opt_flags |= OP_MAPROOT;
} else if (!strcmp(cpopt, "kerb") || !strcmp(cpopt, "k")) {
*exflagsp |= MNT_EXKERB;
opt_flags |= OP_KERB;
} else if (cpoptarg && (!strcmp(cpopt, "mask") ||
!strcmp(cpopt, "m"))) {
if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
syslog(LOG_ERR,
"\"%s\", line %ld: Bad mask: %s",
line, (unsigned long)lineno, cpoptarg);
return (1);
}
usedarg++;
opt_flags |= OP_MASK;
} else if (cpoptarg && (!strcmp(cpopt, "network") ||
!strcmp(cpopt, "n"))) {
if (grp->gr_type != GT_NULL) {
syslog(LOG_ERR,
"\"%s\", line %ld: Network/host conflict",
line, (unsigned long)lineno);
return (1);
} else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
syslog(LOG_ERR,
"\"%s\", line %ld: Bad net: %s",
line, (unsigned long)lineno, cpoptarg);
return (1);
}
grp->gr_type = GT_NET;
*has_hostp = 1;
usedarg++;
opt_flags |= OP_NET;
} else if (!strcmp(cpopt, "alldirs")) {
opt_flags |= OP_ALLDIRS;
} else if (!strcmp(cpopt, "noresvmnt")) {
opt_flags |= OP_NORESMNT;
} else if (!strcmp(cpopt, "noresvport")) {
opt_flags |= OP_NORESPORT;
*exflagsp |= MNT_EXNORESPORT;
} else if (!strcmp(cpopt, "public")) {
*exflagsp |= (MNT_EXNORESPORT | MNT_EXPUBLIC);
opt_flags |= OP_NORESPORT;
} else if (!strcmp(cpopt, "webnfs")) {
*exflagsp |= (MNT_EXNORESPORT | MNT_EXPUBLIC |
MNT_EXRDONLY | MNT_EXPORTANON);
opt_flags |= (OP_MAPALL | OP_NORESPORT);
} else if (cpoptarg && !strcmp(cpopt, "index")) {
ep->ex_indexfile = strdup(cpoptarg);
#ifdef ISO
} else if (cpoptarg && !strcmp(cpopt, "iso")) {
if (get_isoaddr(line, lineno, cpoptarg, grp))
return (1);
*has_hostp = 1;
usedarg++;
opt_flags |= OP_ISO;
#endif /* ISO */
} else {
syslog(LOG_ERR,
"\"%s\", line %ld: Bad opt %s",
line, (unsigned long)lineno, cpopt);
return (1);
}
if (usedarg >= 0) {
*endcp = savedc2;
**endcpp = savedc;
if (usedarg > 0) {
*cpp = cp;
*endcpp = endcp;
}
return (0);
}
cpopt = cpoptend;
}
**endcpp = savedc;
return (0);
}
/*
* Translate a character string to the corresponding list of network
* addresses for a hostname.
*/
static int
get_host(line, lineno, cp, grp)
const char *line;
size_t lineno;
const char *cp;
struct grouplist *grp;
{
struct hostent *hp, *nhp;
char **addrp, **naddrp;
struct hostent t_host;
int i;
u_int32_t saddr;
char *aptr[2];
if (grp->gr_type != GT_NULL) {
syslog(LOG_ERR,
"\"%s\", line %ld: Bad netgroup type for ip host %s",
line, (unsigned long)lineno, cp);
return (1);
}
if ((hp = gethostbyname(cp)) == NULL) {
if (isdigit(*cp)) {
saddr = inet_addr(cp);
if (saddr == -1) {
syslog(LOG_ERR,
"\"%s\", line %ld: inet_addr failed for %s",
line, (unsigned long) lineno, cp);
return (1);
}
if ((hp = gethostbyaddr((const char *) &saddr,
sizeof(saddr), AF_INET)) == NULL) {
hp = &t_host;
hp->h_name = (char *) cp;
hp->h_addrtype = AF_INET;
hp->h_length = sizeof(u_int32_t);
hp->h_addr_list = aptr;
aptr[0] = (char *) &saddr;
aptr[1] = NULL;
}
} else {
syslog(LOG_ERR,
"\"%s\", line %ld: gethostbyname failed for %s: %s",
line, (unsigned long) lineno, cp,
hstrerror(h_errno));
return (1);
}
}
grp->gr_type = GT_HOST;
nhp = grp->gr_ptr.gt_hostent = emalloc(sizeof(struct hostent));
(void)memcpy(nhp, hp, sizeof(struct hostent));
nhp->h_name = estrdup(hp->h_name);
addrp = hp->h_addr_list;
i = 1;
while (*addrp++)
i++;
naddrp = nhp->h_addr_list = emalloc(i * sizeof(char *));
addrp = hp->h_addr_list;
while (*addrp) {
*naddrp = emalloc(hp->h_length);
(void)memcpy(*naddrp, *addrp, hp->h_length);
addrp++;
naddrp++;
}
*naddrp = NULL;
if (debug)
(void)fprintf(stderr, "got host %s\n", hp->h_name);
return (0);
}
/*
* Free up an exports list component
*/
static void
free_exp(ep)
struct exportlist *ep;
{
if (ep->ex_defdir) {
free_host(ep->ex_defdir->dp_hosts);
free(ep->ex_defdir);
}
if (ep->ex_fsdir)
free(ep->ex_fsdir);
if (ep->ex_indexfile)
free(ep->ex_indexfile);
free_dir(ep->ex_dirl);
free(ep);
}
/*
* Free hosts.
*/
static void
free_host(hp)
struct hostlist *hp;
{
struct hostlist *hp2;
while (hp) {
hp2 = hp;
hp = hp->ht_next;
free(hp2);
}
}
static struct hostlist *
get_ht()
{
struct hostlist *hp;
hp = emalloc(sizeof(struct hostlist));
hp->ht_next = NULL;
hp->ht_flag = 0;
return (hp);
}
#ifdef ISO
/*
* Translate an iso address.
*/
static int
get_isoaddr(line, lineno, cp, grp)
const char *line;
size_t lineno;
char *cp;
struct grouplist *grp;
{
struct iso_addr *isop;
struct sockaddr_iso *isoaddr;
if (grp->gr_type != GT_NULL) {
syslog(LOG_ERR,
"\"%s\", line %ld: Bad netgroup type for iso addr %s",
line, (unsigned long)lineno, cp);
return (1);
}
if ((isop = iso_addr(cp)) == NULL) {
syslog(LOG_ERR,
"\"%s\", line %ld: Bad iso addr %s",
line, (unsigned long)lineno, cp);
return (1);
}
isoaddr = emalloc(sizeof(struct sockaddr_iso));
(void)memset(isoaddr, 0, sizeof(struct sockaddr_iso));
(void)memcpy(&isoaddr->siso_addr, isop, sizeof(struct iso_addr));
isoaddr->siso_len = sizeof(struct sockaddr_iso);
isoaddr->siso_family = AF_ISO;
grp->gr_type = GT_ISO;
grp->gr_ptr.gt_isoaddr = isoaddr;
return (0);
}
#endif /* ISO */
/*
* error checked malloc and strdup
*/
static void *
emalloc(n)
size_t n;
{
void *ptr = malloc(n);
if (ptr == NULL) {
syslog(LOG_ERR, "%m");
exit(2);
}
return ptr;
}
static char *
estrdup(s)
const char *s;
{
char *n = strdup(s);
if (n == NULL) {
syslog(LOG_ERR, "%m");
exit(2);
}
return n;
}
/*
* Do the mount syscall with the update flag to push the export info into
* the kernel.
*/
static int
do_mount(line, lineno, ep, grp, exflags, anoncrp, dirp, dirplen, fsb)
const char *line;
size_t lineno;
struct exportlist *ep;
struct grouplist *grp;
int exflags;
struct ucred *anoncrp;
char *dirp;
int dirplen;
struct statfs *fsb;
{
char *cp = NULL;
u_int32_t **addrp;
int done;
char savedc = '\0';
struct sockaddr_in sin, imask;
union {
struct ufs_args ua;
struct iso_args ia;
struct mfs_args ma;
struct msdosfs_args da;
struct adosfs_args aa;
} args;
u_int32_t net;
args.ua.fspec = 0;
args.ua.export.ex_flags = exflags;
args.ua.export.ex_anon = *anoncrp;
args.ua.export.ex_indexfile = ep->ex_indexfile;
(void)memset(&sin, 0, sizeof(sin));
(void)memset(&imask, 0, sizeof(imask));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
imask.sin_family = AF_INET;
imask.sin_len = sizeof(sin);
if (grp->gr_type == GT_HOST)
addrp = (u_int32_t **) grp->gr_ptr.gt_hostent->h_addr_list;
else
addrp = NULL;
done = FALSE;
while (!done) {
switch (grp->gr_type) {
case GT_HOST:
if (addrp) {
sin.sin_addr.s_addr = **addrp;
args.ua.export.ex_addrlen = sizeof(sin);
} else
args.ua.export.ex_addrlen = 0;
args.ua.export.ex_addr = (struct sockaddr *)&sin;
args.ua.export.ex_masklen = 0;
break;
case GT_NET:
if (grp->gr_ptr.gt_net.nt_mask)
imask.sin_addr.s_addr =
grp->gr_ptr.gt_net.nt_mask;
else {
net = ntohl(grp->gr_ptr.gt_net.nt_net);
if (IN_CLASSA(net))
imask.sin_addr.s_addr =
inet_addr("255.0.0.0");
else if (IN_CLASSB(net))
imask.sin_addr.s_addr =
inet_addr("255.255.0.0");
else
imask.sin_addr.s_addr =
inet_addr("255.255.255.0");
grp->gr_ptr.gt_net.nt_mask =
imask.sin_addr.s_addr;
}
sin.sin_addr.s_addr = grp->gr_ptr.gt_net.nt_net;
args.ua.export.ex_addr = (struct sockaddr *) &sin;
args.ua.export.ex_addrlen = sizeof(sin);
args.ua.export.ex_mask = (struct sockaddr *) &imask;
args.ua.export.ex_masklen = sizeof(imask);
break;
#ifdef ISO
case GT_ISO:
args.ua.export.ex_addr =
(struct sockaddr *) grp->gr_ptr.gt_isoaddr;
args.ua.export.ex_addrlen =
sizeof(struct sockaddr_iso);
args.ua.export.ex_masklen = 0;
break;
#endif /* ISO */
default:
syslog(LOG_ERR, "\"%s\", line %ld: Bad netgroup type",
line, (unsigned long)lineno);
if (cp)
*cp = savedc;
return (1);
};
/*
* XXX:
* Maybe I should just use the fsb->f_mntonname path instead
* of looping back up the dirp to the mount point??
* Also, needs to know how to export all types of local
* exportable file systems and not just MOUNT_FFS.
*/
while (mount(fsb->f_fstypename, dirp,
fsb->f_flags | MNT_UPDATE, &args) == -1) {
if (cp)
*cp-- = savedc;
else
cp = dirp + dirplen - 1;
if (errno == EPERM) {
syslog(LOG_ERR,
"\"%s\", line %ld: Can't change attributes for %s to %s",
line, (unsigned long)lineno,
dirp, (grp->gr_type == GT_HOST) ?
grp->gr_ptr.gt_hostent->h_name :
(grp->gr_type == GT_NET) ?
grp->gr_ptr.gt_net.nt_name :
"Unknown");
return (1);
}
if (opt_flags & OP_ALLDIRS) {
syslog(LOG_ERR,
"\"%s\", line %ld: Could not remount %s: %m",
line, (unsigned long)lineno,
dirp);
return (1);
}
/* back up over the last component */
while (*cp == '/' && cp > dirp)
cp--;
while (*(cp - 1) != '/' && cp > dirp)
cp--;
if (cp == dirp) {
if (debug)
(void)fprintf(stderr, "mnt unsucc\n");
syslog(LOG_ERR,
"\"%s\", line %ld: Can't export %s",
line, (unsigned long)lineno, dirp);
return (1);
}
savedc = *cp;
*cp = '\0';
}
if (addrp) {
++addrp;
if (*addrp == NULL)
done = TRUE;
} else
done = TRUE;
}
if (cp)
*cp = savedc;
return (0);
}
/*
* Translate a net address.
*/
static int
get_net(cp, net, maskflg)
char *cp;
struct netmsk *net;
int maskflg;
{
struct netent *np;
long netaddr;
struct in_addr inetaddr, inetaddr2;
char *name;
if ((np = getnetbyname(cp)) != NULL)
inetaddr = inet_makeaddr(np->n_net, 0);
else if (isdigit(*cp)) {
if ((netaddr = inet_network(cp)) == -1)
return (1);
inetaddr = inet_makeaddr(netaddr, 0);
/*
* Due to arbritrary subnet masks, you don't know how many
* bits to shift the address to make it into a network,
* however you do know how to make a network address into
* a host with host == 0 and then compare them.
* (What a pest)
*/
if (!maskflg) {
setnetent(0);
while ((np = getnetent()) != NULL) {
inetaddr2 = inet_makeaddr(np->n_net, 0);
if (inetaddr2.s_addr == inetaddr.s_addr)
break;
}
endnetent();
}
} else
return (1);
if (maskflg)
net->nt_mask = inetaddr.s_addr;
else {
if (np)
name = np->n_name;
else
name = inet_ntoa(inetaddr);
net->nt_name = estrdup(name);
net->nt_net = inetaddr.s_addr;
}
return (0);
}
/*
* Parse out the next white space separated field
*/
static void
nextfield(cp, endcp)
char **cp;
char **endcp;
{
char *p;
p = *cp;
while (*p == ' ' || *p == '\t')
p++;
if (*p == '\n' || *p == '\0')
*cp = *endcp = p;
else {
*cp = p++;
while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
p++;
*endcp = p;
}
}
/*
* Parse a description of a credential.
*/
static void
parsecred(namelist, cr)
char *namelist;
struct ucred *cr;
{
char *name;
int cnt;
char *names;
struct passwd *pw;
struct group *gr;
int ngroups, groups[NGROUPS + 1];
/*
* Set up the unprivileged user.
*/
cr->cr_ref = 1;
cr->cr_uid = -2;
cr->cr_gid = -2;
cr->cr_ngroups = 0;
/*
* Get the user's password table entry.
*/
names = strsep(&namelist, " \t\n");
name = strsep(&names, ":");
if (isdigit(*name) || *name == '-')
pw = getpwuid(atoi(name));
else
pw = getpwnam(name);
/*
* Credentials specified as those of a user.
*/
if (names == NULL) {
if (pw == NULL) {
syslog(LOG_ERR, "Unknown user: %s", name);
return;
}
cr->cr_uid = pw->pw_uid;
ngroups = NGROUPS + 1;
if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
syslog(LOG_ERR, "Too many groups");
/*
* Convert from int's to gid_t's and compress out duplicate
*/
cr->cr_ngroups = ngroups - 1;
cr->cr_gid = groups[0];
for (cnt = 1; cnt < ngroups; cnt++)
cr->cr_groups[cnt - 1] = groups[cnt];
return;
}
/*
* Explicit credential specified as a colon separated list:
* uid:gid:gid:...
*/
if (pw != NULL)
cr->cr_uid = pw->pw_uid;
else if (isdigit(*name) || *name == '-')
cr->cr_uid = atoi(name);
else {
syslog(LOG_ERR, "Unknown user: %s", name);
return;
}
cr->cr_ngroups = 0;
while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) {
name = strsep(&names, ":");
if (isdigit(*name) || *name == '-') {
cr->cr_groups[cr->cr_ngroups++] = atoi(name);
} else {
if ((gr = getgrnam(name)) == NULL) {
syslog(LOG_ERR, "Unknown group: %s", name);
continue;
}
cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
}
}
if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS)
syslog(LOG_ERR, "Too many groups");
}
#define STRSIZ (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50)
/*
* Routines that maintain the remote mounttab
*/
static void
get_mountlist()
{
struct mountlist *mlp, **mlpp;
char *host, *dirp, *cp;
char str[STRSIZ];
FILE *mlfile;
if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
syslog(LOG_ERR, "Can't open %s: %m", _PATH_RMOUNTLIST);
return;
}
mlpp = &mlhead;
while (fgets(str, STRSIZ, mlfile) != NULL) {
cp = str;
host = strsep(&cp, " \t\n");
dirp = strsep(&cp, " \t\n");
if (host == NULL || dirp == NULL)
continue;
mlp = emalloc(sizeof(*mlp));
(void)strncpy(mlp->ml_host, host, RPCMNT_NAMELEN);
mlp->ml_host[RPCMNT_NAMELEN] = '\0';
(void)strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
mlp->ml_next = NULL;
*mlpp = mlp;
mlpp = &mlp->ml_next;
}
(void)fclose(mlfile);
}
static int
del_mlist(hostp, dirp, saddr)
char *hostp, *dirp;
struct sockaddr *saddr;
{
struct mountlist *mlp, **mlpp;
struct mountlist *mlp2;
struct sockaddr_in *sin = (struct sockaddr_in *)saddr;
FILE *mlfile;
int fnd = 0, ret = 0;
mlpp = &mlhead;
mlp = mlhead;
while (mlp) {
if (!strcmp(mlp->ml_host, hostp) &&
(!dirp || !strcmp(mlp->ml_dirp, dirp))) {
if (!(mlp->ml_flag & DP_NORESMNT) &&
ntohs(sin->sin_port) >= IPPORT_RESERVED) {
syslog(LOG_NOTICE,
"Umount request for %s:%s from %s refused\n",
mlp->ml_host, mlp->ml_dirp,
inet_ntoa(sin->sin_addr));
ret = -1;
goto cont;
}
fnd = 1;
mlp2 = mlp;
*mlpp = mlp = mlp->ml_next;
free(mlp2);
} else {
cont:
mlpp = &mlp->ml_next;
mlp = mlp->ml_next;
}
}
if (fnd) {
if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
syslog(LOG_ERR, "Can't update %s: %m",
_PATH_RMOUNTLIST);
return ret;
}
mlp = mlhead;
while (mlp) {
(void)fprintf(mlfile, "%s %s\n", mlp->ml_host,
mlp->ml_dirp);
mlp = mlp->ml_next;
}
(void)fclose(mlfile);
}
return ret;
}
static void
add_mlist(hostp, dirp, flags)
char *hostp, *dirp;
int flags;
{
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 = emalloc(sizeof(*mlp));
strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN);
mlp->ml_host[RPCMNT_NAMELEN] = '\0';
strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
mlp->ml_flag = flags;
mlp->ml_next = NULL;
*mlpp = mlp;
if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
syslog(LOG_ERR, "Can't update %s: %m", _PATH_RMOUNTLIST);
return;
}
(void)fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
(void)fclose(mlfile);
}
/*
* This function is called via. SIGTERM when the system is going down.
* It sends a broadcast RPCMNT_UMNTALL.
*/
/* ARGSUSED */
static void
send_umntall(n)
int n;
{
(void)clnt_broadcast(RPCPROG_MNT, RPCMNT_VER1, RPCMNT_UMNTALL,
xdr_void, NULL, xdr_void, NULL, umntall_each);
exit(0);
}
static int
umntall_each(resultsp, raddr)
caddr_t resultsp;
struct sockaddr_in *raddr;
{
return (1);
}
/*
* Free up a group list.
*/
static void
free_grp(grp)
struct grouplist *grp;
{
char **addrp;
if (grp->gr_type == GT_HOST) {
if (grp->gr_ptr.gt_hostent->h_name) {
addrp = grp->gr_ptr.gt_hostent->h_addr_list;
if (addrp) {
while (*addrp)
free(*addrp++);
free(grp->gr_ptr.gt_hostent->h_addr_list);
}
free(grp->gr_ptr.gt_hostent->h_name);
}
free(grp->gr_ptr.gt_hostent);
} else if (grp->gr_type == GT_NET) {
if (grp->gr_ptr.gt_net.nt_name)
free(grp->gr_ptr.gt_net.nt_name);
}
#ifdef ISO
else if (grp->gr_type == GT_ISO)
free(grp->gr_ptr.gt_isoaddr);
#endif
free(grp);
}
#if 0
static void
SYSLOG(int pri, const char *fmt,...)
{
va_list ap;
va_start(ap, fmt);
if (debug)
vfprintf(stderr, fmt, ap);
else
vsyslog(pri, fmt, ap);
va_end(ap);
}
#endif
/*
* Check options for consistency.
*/
static int
check_options(line, lineno, dp)
const char *line;
size_t lineno;
struct dirlist *dp;
{
if (dp == NULL) {
syslog(LOG_ERR,
"\"%s\", line %ld: missing directory list",
line, (unsigned long)lineno);
return (1);
}
if ((opt_flags & (OP_MAPROOT|OP_MAPALL)) == (OP_MAPROOT|OP_MAPALL) ||
(opt_flags & (OP_MAPROOT|OP_KERB)) == (OP_MAPROOT|OP_KERB) ||
(opt_flags & (OP_MAPALL|OP_KERB)) == (OP_MAPALL|OP_KERB)) {
syslog(LOG_ERR,
"\"%s\", line %ld: -mapall, -maproot and -kerb mutually exclusive",
line, (unsigned long)lineno);
return (1);
}
if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
syslog(LOG_ERR, "\"%s\", line %ld: -mask requires -net",
line, (unsigned long)lineno);
return (1);
}
if ((opt_flags & (OP_NET|OP_ISO)) == (OP_NET|OP_ISO)) {
syslog(LOG_ERR,
"\"%s\", line %ld: -net and -iso mutually exclusive",
line, (unsigned long)lineno);
return (1);
}
if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
syslog(LOG_ERR,
"\"%s\", line %ld: -alldir has multiple directories",
line, (unsigned long)lineno);
return (1);
}
return (0);
}
/*
* Check an absolute directory path for any symbolic links. Return true
* if no symbolic links are found.
*/
static int
check_dirpath(line, lineno, dirp)
const char *line;
size_t lineno;
char *dirp;
{
char *cp;
struct stat sb;
char *file = "";
for (cp = dirp + 1; *cp; cp++) {
if (*cp == '/') {
*cp = '\0';
if (lstat(dirp, &sb) == -1)
goto bad;
if (!S_ISDIR(sb.st_mode))
goto bad1;
*cp = '/';
}
}
cp = NULL;
if (lstat(dirp, &sb) == -1)
goto bad;
if (!S_ISDIR(sb.st_mode) && !S_ISREG(sb.st_mode)) {
file = " file or a";
goto bad1;
}
return 1;
bad:
syslog(LOG_ERR,
"\"%s\", line %ld: lstat for `%s' failed: %m",
line, (unsigned long)lineno, dirp);
if (cp)
*cp = '/';
return 0;
bad1:
syslog(LOG_ERR,
"\"%s\", line %ld: `%s' is not a%s directory",
line, (unsigned long)lineno, dirp, file);
if (cp)
*cp = '/';
return 0;
}
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