OpenBSD-4.6/sbin/mountd/mountd.c
/* $OpenBSD: mountd.c,v 1.69 2007/12/30 13:41:09 sobrado Exp $ */
/* $NetBSD: mountd.c,v 1.31 1996/02/18 11:57:53 fvdl 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. 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
static char 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
static char rcsid[] = "$NetBSD: mountd.c,v 1.31 1996/02/18 11:57:53 fvdl 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 <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <grp.h>
#include <netdb.h>
#include <netgroup.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "pathnames.h"
#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];
};
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
struct exportlist {
struct exportlist *ex_next;
struct dirlist *ex_dirl;
struct dirlist *ex_defdir;
int ex_flag;
fsid_t ex_fs;
char *ex_fsdir;
};
/* ex_flag bits */
#define EX_LINKED 0x1
struct netmsk {
in_addr_t nt_net;
in_addr_t nt_mask;
char *nt_name;
};
union grouptypes {
struct hostent *gt_hostent;
struct netmsk gt_net;
};
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_IGNORE 0x5
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 */
char *add_expdir(struct dirlist **, char *, int);
void add_dlist(struct dirlist **, struct dirlist *, struct grouplist *, int);
void add_mlist(char *, char *);
int check_dirpath(char *);
int check_options(struct dirlist *);
int chk_host(struct dirlist *, in_addr_t, int *, int *);
void del_mlist(char *, char *);
struct dirlist *dirp_search(struct dirlist *, char *);
int do_mount(struct exportlist *, struct grouplist *, int, struct ucred *,
char *, int, struct statfs *);
int do_opt(char **, char **, struct exportlist *, struct grouplist *,
int *, int *, struct ucred *);
struct exportlist *ex_search(fsid_t *);
struct exportlist *get_exp(void);
void free_dir(struct dirlist *);
void free_exp(struct exportlist *);
void free_grp(struct grouplist *);
void free_host(struct hostlist *);
void new_exportlist(int signo);
void get_exportlist(void);
int get_host(char *, struct grouplist *, struct grouplist *);
int get_num(char *);
struct hostlist *get_ht(void);
int get_line(void);
void get_mountlist(void);
int get_net(char *, struct netmsk *, int);
void getexp_err(struct exportlist *, struct grouplist *);
struct grouplist *get_grp(void);
void hang_dirp(struct dirlist *, struct grouplist *, struct exportlist *,
int);
void mntsrv(struct svc_req *, SVCXPRT *);
void nextfield(char **, char **);
void out_of_mem(void);
void parsecred(char *, struct ucred *);
int put_exlist(struct dirlist *, XDR *, struct dirlist *, int *);
int scan_tree(struct dirlist *, in_addr_t);
void send_umntall(int signo);
int umntall_each(caddr_t, struct sockaddr_in *);
int xdr_dir(XDR *, char *);
int xdr_explist(XDR *, caddr_t);
int xdr_fhs(XDR *, caddr_t);
int xdr_mlist(XDR *, caddr_t);
void mountd_svc_run(void);
struct exportlist *exphead;
struct mountlist *mlhead;
struct grouplist *grphead;
char exname[MAXPATHLEN];
struct ucred def_anon = {
1,
(uid_t) -2,
(gid_t) -2,
0,
{ 0, }
};
int resvport_only = 1;
int opt_flags;
/* Bits for above */
#define OP_MAPROOT 0x01
#define OP_MAPALL 0x02
#define OP_MASK 0x08
#define OP_NET 0x10
#define OP_ALLDIRS 0x40
int debug = 0;
volatile sig_atomic_t gothup;
volatile sig_atomic_t gotterm;
/*
* 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(int argc, char *argv[])
{
SVCXPRT *udptransp, *tcptransp;
FILE *pidfile;
int c;
while ((c = getopt(argc, argv, "dnr")) != -1)
switch (c) {
case 'd':
debug = 1;
break;
case 'n':
resvport_only = 0;
break;
case 'r':
/* Compatibility */
break;
default:
fprintf(stderr, "usage: mountd [-dn] [exportsfile]\n");
exit(1);
}
argc -= optind;
argv += optind;
grphead = NULL;
exphead = NULL;
mlhead = NULL;
strlcpy(exname, argc == 1? *argv : _PATH_EXPORTS, sizeof(exname));
openlog("mountd", LOG_PID, LOG_DAEMON);
if (debug)
fprintf(stderr, "Getting export list.\n");
get_exportlist();
if (debug)
fprintf(stderr, "Getting mount list.\n");
get_mountlist();
if (debug)
fprintf(stderr, "Here we go.\n");
if (debug == 0) {
daemon(0, 0);
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
}
/* Store pid in file unless mountd is already running */
pidfile = fopen(_PATH_MOUNTDPID, "r");
if (pidfile != NULL) {
if (fscanf(pidfile, "%d\n", &c) > 0 && c > 0) {
if (kill(c, 0) == 0) {
syslog(LOG_ERR, "Already running (pid %d)", c);
exit(1);
}
}
pidfile = freopen(_PATH_MOUNTDPID, "w", pidfile);
} else {
pidfile = fopen(_PATH_MOUNTDPID, "w");
}
if (pidfile) {
fprintf(pidfile, "%ld\n", (long)getpid());
fclose(pidfile);
}
signal(SIGHUP, (void (*)(int)) new_exportlist);
signal(SIGTERM, (void (*)(int)) send_umntall);
signal(SIGSYS, SIG_IGN);
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);
}
mountd_svc_run();
syslog(LOG_ERR, "Mountd died");
exit(1);
}
void
mountd_svc_run(void)
{
fd_set *fds = NULL;
int fds_size = 0;
extern fd_set *__svc_fdset;
extern int __svc_fdsetsize;
for (;;) {
if (gothup) {
get_exportlist();
gothup = 0;
}
if (gotterm) {
(void) clnt_broadcast(RPCPROG_MNT, RPCMNT_VER1,
RPCMNT_UMNTALL, xdr_void, (caddr_t)0, xdr_void,
(caddr_t)0, umntall_each);
exit(0);
}
if (__svc_fdset) {
int bytes = howmany(__svc_fdsetsize, NFDBITS) *
sizeof(fd_mask);
if (fds_size != __svc_fdsetsize) {
if (fds)
free(fds);
fds = (fd_set *)malloc(bytes); /* XXX */
fds_size = __svc_fdsetsize;
}
memcpy(fds, __svc_fdset, bytes);
} else {
if (fds)
free(fds);
fds = NULL;
}
switch (select(svc_maxfd+1, fds, 0, 0, (struct timeval *)0)) {
case -1:
if (errno == EINTR)
break;
perror("mountd_svc_run: - select failed");
if (fds)
free(fds);
return;
case 0:
break;
default:
svc_getreqset2(fds, svc_maxfd+1);
break;
}
}
}
/*
* The mount rpc service
*/
void
mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
{
char rpcpath[RPCMNT_PATHLEN+1], dirpath[MAXPATHLEN];
struct hostent *hp = NULL;
struct exportlist *ep;
sigset_t sighup_mask;
int defset, hostset;
struct fhreturn fhr;
struct dirlist *dp;
struct statfs fsb;
struct stat stb;
in_addr_t saddr;
u_short sport;
long bad = 0;
sigemptyset(&sighup_mask);
sigaddset(&sighup_mask, SIGHUP);
saddr = transp->xp_raddr.sin_addr.s_addr;
sport = ntohs(transp->xp_raddr.sin_port);
switch (rqstp->rq_proc) {
case NULLPROC:
if (!svc_sendreply(transp, xdr_void, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
case RPCMNT_MOUNT:
if (debug)
fprintf(stderr, "Got mount request from %s\n",
inet_ntoa(transp->xp_raddr.sin_addr));
if (sport >= IPPORT_RESERVED && resvport_only) {
syslog(LOG_NOTICE,
"Refused mount RPC from host %s port %d",
inet_ntoa(transp->xp_raddr.sin_addr), sport);
svcerr_weakauth(transp);
return;
}
if (!svc_getargs(transp, xdr_dir, rpcpath)) {
svcerr_decode(transp);
return;
}
if (debug)
fprintf(stderr, "rpcpath: %s\n", rpcpath);
/*
* Get the real pathname and make sure it is a file or
* directory that exists.
*/
if (realpath(rpcpath, dirpath) == NULL) {
bad = errno;
if (debug)
fprintf(stderr, "realpath failed on %s\n",
rpcpath);
strlcpy(dirpath, rpcpath, sizeof(dirpath));
} else if (stat(dirpath, &stb) < 0 ||
(!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) ||
statfs(dirpath, &fsb) < 0) {
if (debug)
fprintf(stderr, "stat failed on %s\n", dirpath);
bad = ENOENT; /* We will send error reply later */
}
/* Check in the exports list */
sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
ep = ex_search(&fsb.f_fsid);
hostset = defset = 0;
if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) ||
((dp = dirp_search(ep->ex_dirl, dirpath)) &&
chk_host(dp, saddr, &defset, &hostset)) ||
(defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
scan_tree(ep->ex_dirl, saddr) == 0))) {
if (bad) {
if (!svc_sendreply(transp, xdr_long,
(caddr_t)&bad))
syslog(LOG_ERR, "Can't send reply");
sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
return;
}
if (hostset & DP_HOSTSET)
fhr.fhr_flag = hostset;
else
fhr.fhr_flag = defset;
fhr.fhr_vers = rqstp->rq_vers;
/* Get the file handle */
memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
if (errno == ENOSYS) {
syslog(LOG_ERR,
"Kernel does not support NFS exporting, "
"mountd aborting..");
_exit(1);
}
bad = errno;
syslog(LOG_ERR, "Can't get fh for %s", dirpath);
if (!svc_sendreply(transp, xdr_long,
(caddr_t)&bad))
syslog(LOG_ERR, "Can't send reply");
sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
return;
}
if (!svc_sendreply(transp, xdr_fhs, (caddr_t)&fhr))
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);
else
add_mlist(inet_ntoa(transp->xp_raddr.sin_addr),
dirpath);
if (debug) {
fprintf(stderr,
"Mount successful for %s by %s.\n",
dirpath,
inet_ntoa(transp->xp_raddr.sin_addr));
}
} else
bad = EACCES;
if (bad && !svc_sendreply(transp, xdr_long, (caddr_t)&bad))
syslog(LOG_ERR, "Can't send reply");
sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
return;
case RPCMNT_DUMP:
if (!svc_sendreply(transp, xdr_mlist, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
case RPCMNT_UMOUNT:
if (sport >= IPPORT_RESERVED && resvport_only) {
svcerr_weakauth(transp);
return;
}
if (!svc_getargs(transp, xdr_dir, dirpath)) {
svcerr_decode(transp);
return;
}
if (!svc_sendreply(transp, xdr_void, NULL))
syslog(LOG_ERR, "Can't send reply");
hp = gethostbyaddr((caddr_t)&saddr, sizeof(saddr), AF_INET);
if (hp)
del_mlist(hp->h_name, dirpath);
del_mlist(inet_ntoa(transp->xp_raddr.sin_addr), dirpath);
return;
case RPCMNT_UMNTALL:
if (sport >= IPPORT_RESERVED && resvport_only) {
svcerr_weakauth(transp);
return;
}
if (!svc_sendreply(transp, xdr_void, NULL))
syslog(LOG_ERR, "Can't send reply");
hp = gethostbyaddr((caddr_t)&saddr, sizeof(saddr), AF_INET);
if (hp)
del_mlist(hp->h_name, NULL);
del_mlist(inet_ntoa(transp->xp_raddr.sin_addr), NULL);
return;
case RPCMNT_EXPORT:
if (!svc_sendreply(transp, xdr_explist, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
default:
svcerr_noproc(transp);
return;
}
}
/*
* Xdr conversion for a dirpath string
*/
int
xdr_dir(XDR *xdrsp, char *dirp)
{
return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
}
/*
* Xdr routine to generate file handle reply
*/
int
xdr_fhs(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);
auth = RPCAUTH_UNIX;
len = 1;
if (!xdr_long(xdrsp, &len))
return (0);
return (xdr_long(xdrsp, &auth));
}
return (0);
}
int
xdr_mlist(XDR *xdrsp, caddr_t cp)
{
int true = 1, false = 0;
struct mountlist *mlp;
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(XDR *xdrsp, caddr_t cp)
{
struct exportlist *ep;
int false = 0, putdef;
sigset_t sighup_mask;
sigemptyset(&sighup_mask);
sigaddset(&sighup_mask, SIGHUP);
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;
}
sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
if (!xdr_bool(xdrsp, &false))
return (0);
return (1);
errout:
sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
return (0);
}
/*
* Called from xdr_explist() to traverse the tree and export the
* directory paths.
*/
int
put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp,
int *putdefp)
{
int true = 1, false = 0, gotalldir = 0;
struct grouplist *grp;
struct hostlist *hp;
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);
}
#define LINESIZ 10240
char line[LINESIZ];
FILE *exp_file;
void
new_exportlist(int signo)
{
gothup = 1;
}
/*
* Get the export list
*/
void
get_exportlist(void)
{
int len, has_host, exflags, got_nondir, dirplen = 0, num;
int lookup_failed, num_hosts, i, netgrp;
char *cp, *endcp, *dirp = NULL, *hst, *usr, *dom, savedc;
struct exportlist *ep, *ep2;
struct grouplist *grp, *tgrp;
struct exportlist **epp;
struct dirlist *dirhead;
struct statfs fsb, *ofsp, *fsp;
struct hostent *hpe;
struct ucred anon;
union {
struct ufs_args ua;
struct iso_args ia;
struct mfs_args ma;
struct msdosfs_args da;
} targs;
struct fsarray {
int exflags;
char *mntonname;
} *fstbl;
/*
* First, get rid of the old list
*/
ep = exphead;
while (ep) {
ep2 = ep;
ep = ep->ex_next;
free_exp(ep2);
}
exphead = NULL;
grp = grphead;
while (grp) {
tgrp = grp;
grp = grp->gr_next;
free_grp(tgrp);
}
grphead = NULL;
/*
* And delete exports that are in the kernel for all local
* file systems.
* XXX: Should know how to handle all local exportable file systems
* instead of just MOUNT_FFS.
*/
num = getmntinfo(&ofsp, MNT_NOWAIT);
if (num == 0 && errno)
syslog(LOG_ERR, "getmntinfo: %s", strerror(errno));
fsp = ofsp;
fstbl = calloc(num, sizeof (fstbl[0]));
if (fstbl == NULL)
out_of_mem();
for (i = 0; i < num; i++) {
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_CD9660, MFSNAMELEN)) {
fstbl[i].exflags = MNT_DELEXPORT;
fstbl[i].mntonname = fsp->f_mntonname;
}
fsp++;
}
/*
* 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", exname);
exit(2);
}
dirhead = NULL;
while (get_line()) {
if (debug)
fprintf(stderr, "Got line %s\n",line);
cp = line;
nextfield(&cp, &endcp);
if (*cp == '#')
goto nextline;
/*
* Set defaults.
*/
has_host = FALSE;
num_hosts = 0;
lookup_failed = 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) {
getexp_err(ep, tgrp);
goto nextline;
}
if (*cp == '-') {
if (ep == NULL) {
getexp_err(ep, tgrp);
goto nextline;
}
if (debug)
fprintf(stderr, "doing opt %s\n", cp);
got_nondir = 1;
if (do_opt(&cp, &endcp, ep, grp, &has_host,
&exflags, &anon)) {
getexp_err(ep, tgrp);
goto nextline;
}
} else if (*cp == '/') {
savedc = *endcp;
*endcp = '\0';
if (check_dirpath(cp) &&
statfs(cp, &fsb) >= 0) {
if (got_nondir) {
syslog(LOG_ERR, "Dirs must be first");
getexp_err(ep, tgrp);
goto nextline;
}
if (ep) {
if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] ||
ep->ex_fs.val[1] != fsb.f_fsid.val[1]) {
getexp_err(ep, tgrp);
goto nextline;
}
} else {
/*
* See if this directory is already
* in the list.
*/
ep = ex_search(&fsb.f_fsid);
if (ep == NULL) {
int len;
ep = get_exp();
ep->ex_fs = fsb.f_fsid;
len = strlen(fsb.f_mntonname) + 1;
ep->ex_fsdir = (char *)malloc(len);
if (ep->ex_fsdir)
strlcpy(ep->ex_fsdir,
fsb.f_mntonname, len);
else
out_of_mem();
if (debug)
fprintf(stderr,
"Making new ep fs=0x%x,0x%x\n",
fsb.f_fsid.val[0],
fsb.f_fsid.val[1]);
} else if (debug)
fprintf(stderr,
"Found ep fs=0x%x,0x%x\n",
fsb.f_fsid.val[0],
fsb.f_fsid.val[1]);
}
/*
* Add dirpath to export mount point.
*/
dirp = add_expdir(&dirhead, cp, len);
dirplen = len;
} else {
getexp_err(ep, tgrp);
goto nextline;
}
*endcp = savedc;
} else {
savedc = *endcp;
*endcp = '\0';
got_nondir = 1;
if (ep == NULL) {
getexp_err(ep, tgrp);
goto nextline;
}
/*
* Get the host or netgroup.
*/
setnetgrent(cp);
netgrp = getnetgrent((const char **)&hst,
(const char **)&usr, (const char **)&dom);
do {
if (has_host) {
grp->gr_next = get_grp();
grp = grp->gr_next;
}
if (netgrp) {
if (hst == NULL) {
syslog(LOG_ERR,
"NULL hostname in netgroup %s, skipping",
cp);
grp->gr_type = GT_IGNORE;
lookup_failed = TRUE;
continue;
} else if (get_host(hst, grp, tgrp)) {
syslog(LOG_ERR,
"Unknown host (%s) in netgroup %s",
hst, cp);
grp->gr_type = GT_IGNORE;
lookup_failed = TRUE;
continue;
}
} else if (get_host(cp, grp, tgrp)) {
syslog(LOG_ERR,
"Unknown host (%s) in line %s",
cp, line);
grp->gr_type = GT_IGNORE;
lookup_failed = TRUE;
continue;
}
has_host = TRUE;
num_hosts++;
} while (netgrp && getnetgrent((const char **)&hst,
(const char **)&usr, (const char **)&dom));
endnetgrent();
*endcp = savedc;
}
cp = endcp;
nextfield(&cp, &endcp);
len = endcp - cp;
}
/*
* If the exports list is empty due to unresolvable hostnames
* we throw away the line.
*/
if (lookup_failed == TRUE && num_hosts == 0 &&
tgrp->gr_type == GT_IGNORE) {
getexp_err(ep, tgrp);
goto nextline;
}
if (check_options(dirhead)) {
getexp_err(ep, tgrp);
goto nextline;
}
if (!has_host) {
grp->gr_type = GT_HOST;
if (debug)
fprintf(stderr, "Adding a default entry\n");
/* add a default group and make the grp list NULL */
hpe = (struct hostent *)malloc(sizeof(struct hostent));
if (hpe == NULL)
out_of_mem();
hpe->h_name = strdup("Default");
if (hpe->h_name == NULL)
out_of_mem();
hpe->h_addrtype = AF_INET;
hpe->h_length = sizeof (u_int32_t);
hpe->h_addr_list = NULL;
grp->gr_ptr.gt_hostent = hpe;
/*
* Don't allow a network export coincide with a list of
* host(s) on the same line.
*/
} else if ((opt_flags & OP_NET) && tgrp->gr_next) {
getexp_err(ep, tgrp);
goto nextline;
}
/*
* 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 {
/*
* remove filesystem from unexport list
* add MNT_DELEXPORT to exflags to clean up
* any old addrlist in the kernel
*/
for (i = 0; i < num; i++) {
if ((fstbl[i].mntonname != NULL) &&
(strcmp (dirp, fstbl[i].mntonname) == 0) &&
(fstbl[i].exflags & MNT_DELEXPORT)) {
exflags |= MNT_DELEXPORT;
fstbl[i].exflags = 0;
if (debug)
fprintf(stderr, "removing %s %s from unexport list\n", dirp, fstbl[i].mntonname);
}
}
if (debug)
fprintf(stderr, "exporting %s\n", dirp);
/*
* Non-zero return indicates an error. Return
* val of 1 means line is invalid (not just entry).
*/
i = do_mount(ep, grp, exflags, &anon, dirp, dirplen, &fsb);
exflags &= ~MNT_DELEXPORT;
if (i == 1) {
getexp_err(ep, tgrp);
goto nextline;
} else if (i == 2) {
syslog(LOG_ERR,
"Bad exports list entry (%s) in line %s",
(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", line);
}
} 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;
}
nextline:
if (dirhead) {
free_dir(dirhead);
dirhead = NULL;
}
}
fsp = ofsp;
for (i = 0; i < num; i++, fsp++) {
if ((fstbl[i].exflags & MNT_DELEXPORT) == 0)
continue;
if (debug)
fprintf(stderr, "unexporting %s %s\n",
fsp->f_mntonname, fstbl[i].mntonname);
bzero(&targs, sizeof(targs));
if (mount(fsp->f_fstypename, fsp->f_mntonname,
fsp->f_flags | MNT_UPDATE, &targs) < 0)
syslog(LOG_ERR, "Can't delete exports for %s: %m",
fsp->f_mntonname);
}
free(fstbl);
fclose(exp_file);
}
/*
* Allocate an export list element
*/
struct exportlist *
get_exp(void)
{
struct exportlist *ep;
ep = (struct exportlist *)malloc(sizeof (struct exportlist));
if (ep == NULL)
out_of_mem();
memset(ep, 0, sizeof(struct exportlist));
return (ep);
}
/*
* Allocate a group list element
*/
struct grouplist *
get_grp(void)
{
struct grouplist *gp;
gp = (struct grouplist *)malloc(sizeof (struct grouplist));
if (gp == NULL)
out_of_mem();
memset(gp, 0, sizeof(struct grouplist));
return (gp);
}
/*
* Clean up upon an error in get_exportlist().
*/
void
getexp_err(struct exportlist *ep, struct grouplist *grp)
{
struct grouplist *tgrp;
syslog(LOG_ERR, "Bad exports list line %s", line);
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.
*/
struct exportlist *
ex_search(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.
*/
char *
add_expdir(struct dirlist **dpp, char *cp, int len)
{
struct dirlist *dp;
/* do not need +1 because of dp_dirp[1] */
dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
if (dp == NULL)
out_of_mem();
dp->dp_left = *dpp;
dp->dp_right = NULL;
dp->dp_flag = 0;
dp->dp_hosts = NULL;
strlcpy(dp->dp_dirp, cp, len + 1);
*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(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((caddr_t)dp);
else
ep->ex_defdir = dp;
if (grp == NULL) {
ep->ex_defdir->dp_flag |= DP_DEFSET;
} else while (grp) {
hp = get_ht();
hp->ht_grp = grp;
hp->ht_next = ep->ex_defdir->dp_hosts;
ep->ex_defdir->dp_hosts = hp;
grp = grp->gr_next;
}
} else {
/*
* Loop through 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.
*/
void
add_dlist(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((caddr_t)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();
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;
}
}
/*
* Search for a dirpath on the export point.
*/
struct dirlist *
dirp_search(struct dirlist *dp, char *dirpath)
{
int cmp;
if (dp) {
cmp = strcmp(dp->dp_dirp, dirpath);
if (cmp > 0)
return (dirp_search(dp->dp_left, dirpath));
else if (cmp < 0)
return (dirp_search(dp->dp_right, dirpath));
else
return (dp);
}
return (dp);
}
/*
* Scan for a host match in a directory tree.
*/
int
chk_host(struct dirlist *dp, in_addr_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;
while (*addrp) {
if (**addrp == saddr) {
*hostsetp = (hp->ht_flag | DP_HOSTSET);
return (1);
}
addrp++;
}
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.
*/
int
scan_tree(struct dirlist *dp, in_addr_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.
*/
void
free_dir(struct dirlist *dp)
{
if (dp) {
free_dir(dp->dp_left);
free_dir(dp->dp_right);
free_host(dp->dp_hosts);
free((caddr_t)dp);
}
}
/*
* Parse the option string and update fields.
* Option arguments may either be -<option>=<value> or
* -<option> <value>
*/
int
do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
int *has_hostp, int *exflagsp, struct ucred *cr)
{
char *cp, *endcp, *cpopt, savedc, savedc2 = 0;
char *cpoptarg, *cpoptend;
int allflag, usedarg;
cpopt = *cpp;
cpopt++;
cp = *endcpp;
savedc = *cp;
*cp = '\0';
while (cpopt && *cpopt) {
allflag = 1;
usedarg = -2;
if ((cpoptend = strchr(cpopt, ','))) {
*cpoptend++ = '\0';
if ((cpoptarg = strchr(cpopt, '=')))
*cpoptarg++ = '\0';
} else {
if ((cpoptarg = strchr(cpopt, '=')))
*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 (cpoptarg && (!strcmp(cpopt, "mask") ||
!strcmp(cpopt, "m"))) {
if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
syslog(LOG_ERR, "Bad mask: %s", 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, "Network/host conflict");
return (1);
} else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
syslog(LOG_ERR, "Bad net: %s", 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 {
syslog(LOG_ERR, "Bad opt %s", 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.
*/
int
get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
{
struct hostent *hp, *nhp, t_host;
struct grouplist *checkgrp;
char **addrp, **naddrp;
struct in_addr saddr;
char *aptr[2];
int i;
if (grp->gr_type != GT_NULL)
return (1);
if ((hp = gethostbyname(cp)) == NULL) {
if (isdigit(*cp)) {
if (inet_aton(cp, &saddr) == 0) {
syslog(LOG_ERR, "inet_aton failed for %s", cp);
return (1);
}
if ((hp = gethostbyaddr((caddr_t)&saddr.s_addr,
sizeof (saddr.s_addr), AF_INET)) == NULL) {
hp = &t_host;
hp->h_name = 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, "gethostbyname; failed for %s: %s", cp,
hstrerror(h_errno));
return (1);
}
}
/* only insert each host onto the list once */
for (checkgrp = tgrp; checkgrp; checkgrp = checkgrp->gr_next) {
if (checkgrp->gr_type == GT_HOST &&
checkgrp->gr_ptr.gt_hostent != NULL &&
!strcmp(checkgrp->gr_ptr.gt_hostent->h_name, hp->h_name)) {
grp->gr_type = GT_IGNORE;
return (0);
}
}
grp->gr_type = GT_HOST;
nhp = grp->gr_ptr.gt_hostent = (struct hostent *)
malloc(sizeof(struct hostent));
if (nhp == NULL)
out_of_mem();
memcpy(nhp, hp, sizeof(struct hostent));
i = strlen(hp->h_name)+1;
nhp->h_name = (char *)malloc(i);
if (nhp->h_name == NULL)
out_of_mem();
memcpy(nhp->h_name, hp->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)
out_of_mem();
addrp = hp->h_addr_list;
while (*addrp) {
*naddrp = (char *)
malloc(hp->h_length);
if (*naddrp == NULL)
out_of_mem();
memcpy(*naddrp, *addrp, hp->h_length);
addrp++;
naddrp++;
}
*naddrp = NULL;
if (debug)
fprintf(stderr, "got host %s\n", hp->h_name);
return (0);
}
/*
* Free up an exports list component
*/
void
free_exp(struct exportlist *ep)
{
if (ep->ex_defdir) {
free_host(ep->ex_defdir->dp_hosts);
free((caddr_t)ep->ex_defdir);
}
if (ep->ex_fsdir)
free(ep->ex_fsdir);
free_dir(ep->ex_dirl);
free((caddr_t)ep);
}
/*
* Free hosts.
*/
void
free_host(struct hostlist *hp)
{
struct hostlist *hp2;
while (hp) {
hp2 = hp;
hp = hp->ht_next;
free((caddr_t)hp2);
}
}
struct hostlist *
get_ht(void)
{
struct hostlist *hp;
hp = (struct hostlist *)malloc(sizeof (struct hostlist));
if (hp == NULL)
out_of_mem();
hp->ht_next = NULL;
hp->ht_flag = 0;
return (hp);
}
/*
* Out of memory, fatal
*/
void
out_of_mem(void)
{
syslog(LOG_ERR, "Out of memory");
exit(2);
}
/*
* Do the mount syscall with the update flag to push the export info into
* the kernel. Returns 0 on success, 1 for fatal error, and 2 for error
* that only invalidates the specific entry/host.
*/
int
do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
struct ucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
{
struct sockaddr_in sin, imask;
union {
struct ufs_args ua;
struct iso_args ia;
struct mfs_args ma;
struct msdosfs_args da;
} args;
char savedc = '\0';
u_int32_t **addrp;
char *cp = NULL;
in_addr_t net;
int done;
args.ua.fspec = 0;
args.ua.export_info.ex_flags = exflags;
args.ua.export_info.ex_anon = *anoncrp;
memset(&sin, 0, sizeof(sin));
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:
args.ua.export_info.ex_addr = (struct sockaddr *)&sin;
args.ua.export_info.ex_masklen = 0;
if (!addrp) {
args.ua.export_info.ex_addrlen = 0;
break;
}
sin.sin_addr.s_addr = **addrp;
args.ua.export_info.ex_addrlen = sizeof(sin);
break;
case GT_NET:
sin.sin_addr.s_addr = grp->gr_ptr.gt_net.nt_net;
args.ua.export_info.ex_addr = (struct sockaddr *)&sin;
args.ua.export_info.ex_addrlen = sizeof (sin);
args.ua.export_info.ex_mask = (struct sockaddr *)&imask;
args.ua.export_info.ex_masklen = sizeof (imask);
if (grp->gr_ptr.gt_net.nt_mask) {
imask.sin_addr.s_addr = grp->gr_ptr.gt_net.nt_mask;
break;
}
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;
break;
case GT_IGNORE:
return (0);
default:
syslog(LOG_ERR, "Bad grouptype");
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) < 0) {
if (cp)
*cp-- = savedc;
else
cp = dirp + dirplen - 1;
if (errno == EPERM) {
syslog(LOG_ERR,
"Can't change attributes for %s (%s).\n",
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 (2);
}
if (opt_flags & OP_ALLDIRS) {
#if 0
syslog(LOG_ERR, "Could not remount %s: %m",
dirp);
return (2);
#endif
}
/* back up over the last component */
while (*cp == '/' && cp > dirp)
cp--;
while (*(cp - 1) != '/' && cp > dirp)
cp--;
if (cp == dirp) {
if (debug)
fprintf(stderr, "mnt unsucc\n");
syslog(LOG_ERR, "Can't export %s: %m", dirp);
return (2);
}
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.
*/
int
get_net(char *cp, struct netmsk *net, int maskflg)
{
struct in_addr inetaddr, inetaddr2;
in_addr_t netaddr;
struct netent *np;
char *name;
if ((netaddr = inet_network(cp)) != INADDR_NONE) {
inetaddr = inet_makeaddr(netaddr, 0);
/*
* Due to arbitrary 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())) {
inetaddr2 = inet_makeaddr(np->n_net, 0);
if (inetaddr2.s_addr == inetaddr.s_addr)
break;
}
endnetent();
}
} else {
if ((np = getnetbyname(cp)))
inetaddr = inet_makeaddr(np->n_net, 0);
else
return (1);
}
if (maskflg)
net->nt_mask = inetaddr.s_addr;
else {
int len;
if (np)
name = np->n_name;
else
name = inet_ntoa(inetaddr);
len = strlen(name) + 1;
net->nt_name = (char *)malloc(len);
if (net->nt_name == NULL)
out_of_mem();
strlcpy(net->nt_name, name, len);
net->nt_net = inetaddr.s_addr;
}
return (0);
}
/*
* Parse out the next white space separated field
*/
void
nextfield(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;
}
}
/*
* Get an exports file line. Skip over blank lines and handle line
* continuations.
*/
int
get_line(void)
{
int totlen, cont_line, len;
char *p, *cp;
/*
* Loop around ignoring blank lines and getting all continuation lines.
*/
p = line;
totlen = 0;
do {
if (fgets(p, LINESIZ - totlen, exp_file) == NULL)
return (0);
len = strlen(p);
cp = p + len - 1;
cont_line = 0;
while (cp >= p && (*cp == ' ' || *cp == '\t' || *cp == '\n' ||
*cp == '\\')) {
if (*cp == '\\')
cont_line = 1;
cp--;
len--;
}
*++cp = '\0';
if (len > 0) {
totlen += len;
if (totlen >= LINESIZ) {
syslog(LOG_ERR, "Exports line too long");
exit(2);
}
p = cp;
}
} while (totlen == 0 || cont_line);
return (1);
}
/*
* Parse a description of a credential.
*/
void
parsecred(char *namelist, struct ucred *cr)
{
gid_t groups[NGROUPS + 1];
char *name, *names;
struct passwd *pw;
struct group *gr;
int ngroups, cnt;
/*
* Set up the unprivileged user.
*/
cr->cr_ref = 1;
cr->cr_uid = (uid_t)-2;
cr->cr_gid = (gid_t)-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");
/*
* 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
*/
void
get_mountlist(void)
{
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 = (struct mountlist *)malloc(sizeof (*mlp));
if (mlp == NULL)
out_of_mem();
strlcpy(mlp->ml_host, host, sizeof(mlp->ml_host));
strlcpy(mlp->ml_dirp, dirp, sizeof(mlp->ml_dirp));
mlp->ml_next = NULL;
*mlpp = mlp;
mlpp = &mlp->ml_next;
}
fclose(mlfile);
}
void
del_mlist(char *hostp, char *dirp)
{
struct mountlist *mlp, **mlpp;
struct mountlist *mlp2;
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;
mlp2 = mlp;
*mlpp = mlp = mlp->ml_next;
free((caddr_t)mlp2);
} else {
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;
}
mlp = mlhead;
while (mlp) {
fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
mlp = mlp->ml_next;
}
fclose(mlfile);
}
}
void
add_mlist(char *hostp, char *dirp)
{
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));
if (mlp == NULL)
out_of_mem();
strlcpy(mlp->ml_host, hostp, sizeof(mlp->ml_host));
strlcpy(mlp->ml_dirp, dirp, sizeof(mlp->ml_dirp));
mlp->ml_next = NULL;
*mlpp = mlp;
if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
syslog(LOG_ERR, "Can't update %s: %m", _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(int signo)
{
gotterm = 1;
}
int
umntall_each(caddr_t resultsp, struct sockaddr_in *raddr)
{
return (1);
}
/*
* Free up a group list.
*/
void
free_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;
while (addrp && *addrp)
free(*addrp++);
free((caddr_t)grp->gr_ptr.gt_hostent->h_addr_list);
free(grp->gr_ptr.gt_hostent->h_name);
}
free((caddr_t)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);
}
free((caddr_t)grp);
}
/*
* Check options for consistency.
*/
int
check_options(struct dirlist *dp)
{
if (dp == NULL)
return (1);
if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
return (1);
}
if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
syslog(LOG_ERR, "-mask requires -network");
return (1);
}
if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
syslog(LOG_ERR, "-alldirs has multiple directories");
return (1);
}
return (0);
}
/*
* Check an absolute directory path for any symbolic links. Return true
* if no symbolic links are found.
*/
int
check_dirpath(char *dirp)
{
struct stat sb;
int ret = 1;
char *cp;
/* Remove trailing '/' */
cp = dirp + strlen(dirp) - 1;
while (cp > dirp && *cp == '/')
*cp-- = '\0';
cp = dirp + 1;
while (*cp && ret) {
if (*cp == '/') {
*cp = '\0';
if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
ret = 0;
*cp = '/';
}
cp++;
}
if (lstat(dirp, &sb) < 0 ||
(!S_ISDIR(sb.st_mode) && !S_ISREG(sb.st_mode)))
ret = 0;
return (ret);
}