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NetBSD/usr.sbin/mountd/mountd.c

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/* $NetBSD: mountd.c,v 1.130 2018/01/09 03:31:13 christos 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)mountd.c 8.15 (Berkeley) 5/1/95";
#else
__RCSID("$NetBSD: mountd.c,v 1.130 2018/01/09 03:31:13 christos 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>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsmount.h>
#ifdef MOUNTD_RUMP
#include <rump/rump.h>
#include <rump/rump_syscalls.h>
#include <pthread.h>
#include <semaphore.h>
#endif
#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 <err.h>
#include <util.h>
#include "pathnames.h"
#ifdef IPSEC
#include <netipsec/ipsec.h>
#ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */
#undef IPSEC
#endif
#include "ipsec.h"
#endif
#include <stdarg.h>
#ifdef MOUNTD_RUMP
#include "svc_fdset.h"
#define DEBUGGING 1
#else
#define DEBUGGING 0
#endif
#include "mountd.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
union grouptypes {
struct addrinfo *gt_addrinfo;
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
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;
size_t fhr_fhsize;
union {
uint8_t v2[NFSX_V2FH];
uint8_t v3[NFSX_V3FHMAX];
} fhr_fh;
};
/* Global defs */
static char *add_expdir(struct dirlist **, char *, int);
static void add_dlist(struct dirlist **, struct dirlist *,
struct grouplist *, int);
static void add_mlist(char *, char *, int);
static int check_dirpath(const char *, size_t, char *);
static int check_options(const char *, size_t, struct dirlist *);
static int chk_host(struct dirlist *, struct sockaddr *, int *, int *);
static int del_mlist(char *, char *, struct sockaddr *);
static struct dirlist *dirp_search(struct dirlist *, char *);
static int do_nfssvc(const char *, size_t, struct exportlist *,
struct grouplist *, int, struct uucred *, char *, int, struct statvfs *);
static int do_opt(const char *, size_t, char **, char **,
struct exportlist *, struct grouplist *, int *, int *, struct uucred *);
static struct exportlist *ex_search(fsid_t *);
static int parse_directory(const char *, size_t, struct grouplist *,
int, char *, struct exportlist **, struct statvfs *);
static int parse_host_netgroup(const char *, size_t, struct exportlist *,
struct grouplist *, char *, int *, struct grouplist **);
static struct exportlist *get_exp(void);
static void free_dir(struct dirlist *);
static void free_exp(struct exportlist *);
static void free_grp(struct grouplist *);
static void free_host(struct hostlist *);
static void get_exportlist(int);
static int get_host(const char *, size_t, const char *,
struct grouplist *);
static struct hostlist *get_ht(void);
static void get_mountlist(void);
static void free_exp_grp(struct exportlist *, struct grouplist *);
static struct grouplist *get_grp(void);
static void hang_dirp(struct dirlist *, struct grouplist *,
struct exportlist *, int);
static void mntsrv(struct svc_req *, SVCXPRT *);
static void nextfield(char **, char **);
static void parsecred(char *, struct uucred *);
static int put_exlist(struct dirlist *, XDR *, struct dirlist *, int *);
static int scan_tree(struct dirlist *, struct sockaddr *);
__dead static void send_umntall(int);
static int xdr_dir(XDR *, char *);
static int xdr_explist(XDR *, caddr_t);
static int xdr_fhs(XDR *, caddr_t);
static int xdr_mlist(XDR *, caddr_t);
static int bitcmp(void *, void *, int);
static int netpartcmp(struct sockaddr *, struct sockaddr *, int);
static int sacmp(struct sockaddr *, struct sockaddr *);
static int allones(struct sockaddr_storage *, int);
static void bind_resv_port(int, sa_family_t, in_port_t);
__dead static void no_nfs(int);
static struct exportlist *exphead;
static struct mountlist *mlhead;
static struct grouplist *grphead;
static const char *exname;
static struct uucred def_anon = {
1,
(uid_t) -2,
(gid_t) -2,
0,
{ 0 }
};
int opt_flags;
static int have_v6 = 1;
const int ninumeric = NI_NUMERICHOST;
int debug = DEBUGGING;
#if 0
static void SYSLOG(int, const char *,...);
#endif
/*
* If this is non-zero, -noresvport and -noresvmnt are implied for
* each export.
*/
static int noprivports;
#ifdef MOUNTD_RUMP
#define C2FD(_c_) ((int)(uintptr_t)(_c_))
static int
rumpread(void *cookie, char *buf, int count)
{
return rump_sys_read(C2FD(cookie), buf, count);
}
static int
rumpwrite(void *cookie, const char *buf, int count)
{
return rump_sys_write(C2FD(cookie), buf, count);
}
static off_t
rumpseek(void *cookie, off_t off, int whence)
{
return rump_sys_lseek(C2FD(cookie), off, whence);
}
static int
rumpclose(void *cookie)
{
return rump_sys_close(C2FD(cookie));
}
int __sflags(const char *, int *); /* XXX */
static FILE *
rumpfopen(const char *path, const char *opts)
{
int fd, oflags;
__sflags(opts, &oflags);
fd = rump_sys_open(path, oflags, 0777);
if (fd == -1)
return NULL;
return funopen((void *)(uintptr_t)fd,
rumpread, rumpwrite, rumpseek, rumpclose);
}
/*
* Make sure mountd signal handler is executed from a thread context
* instead of the signal handler. This avoids the signal handler
* ruining our kernel context.
*/
static sem_t exportsem;
static void
signal_get_exportlist(int sig)
{
sem_post(&exportsem);
}
static void *
exportlist_thread(void *arg)
{
for (;;) {
sem_wait(&exportsem);
get_exportlist(0);
}
return NULL;
}
#define statvfs1(a, b, c) rump_sys_statvfs1((a), (b), (c))
#define getfh(a, b, c) rump_sys_getfh((a), (b), (c))
#define nfssvc(a, b) rump_sys_nfssvc((a), (b))
#define fopen(a, b) rumpfopen((a), (b))
#define lstat(a, b) rump_sys_lstat((a), (b))
#define stat(a, b) rump_sys_stat((a), (b))
/*
* 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.
*/
void *mountd_main(void *);
void *
mountd_main(void *arg)
#else
int
main(int argc, char **argv)
#endif
{
SVCXPRT *udptransp, *tcptransp, *udp6transp, *tcp6transp;
struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
int udpsock, tcpsock, udp6sock, tcp6sock;
int xcreated = 0;
int one = 1;
int maxrec = RPC_MAXDATASIZE;
in_port_t forcedport = 0;
#ifdef IPSEC
char *policy = NULL;
#define ADDOPTS "P:"
#else
#define ADDOPTS
#endif
#ifndef MOUNTD_RUMP
int s, c;
while ((c = getopt(argc, argv, "dNnrp:" ADDOPTS)) != -1)
switch (c) {
#ifdef IPSEC
case 'P':
if (ipsecsetup_test(policy = optarg))
errx(1, "Invalid ipsec policy `%s'", policy);
break;
#endif
case 'p':
/* A forced port "0" will dynamically allocate a port */
forcedport = atoi(optarg);
break;
case 'd':
debug = 1;
break;
case 'N':
noprivports = 1;
break;
/* Compatibility */
case 'n':
case 'r':
break;
default:
fprintf(stderr, "Usage: %s [-dN]"
#ifdef IPSEC
" [-P policy]"
#endif
" [-p port] [exportsfile]\n", getprogname());
exit(1);
};
argc -= optind;
argv += optind;
if (argc == 1)
exname = *argv;
else
exname = _PATH_EXPORTS;
s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if (s < 0)
have_v6 = 0;
else
close(s);
(void)signal(SIGHUP, get_exportlist);
#else
extern sem_t gensem;
pthread_t ptdummy;
svc_fdset_init(SVC_FDSET_MT);
sem_init(&exportsem, 0, 0);
pthread_create(&ptdummy, NULL, exportlist_thread, NULL);
exname = _PATH_EXPORTS;
have_v6 = 0;
(void)signal(SIGHUP, signal_get_exportlist);
#endif
grphead = NULL;
exphead = NULL;
mlhead = NULL;
openlog("mountd", LOG_PID | (debug ? LOG_PERROR : 0), LOG_DAEMON);
(void)signal(SIGSYS, no_nfs);
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");
(void)signal(SIGTERM, send_umntall);
rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
udpsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
tcpsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
udp6sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
tcp6sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
/*
* We're doing host-based access checks here, so don't allow
* v4-in-v6 to confuse things. The kernel will disable it
* by default on NFS sockets too.
*/
if (udp6sock != -1 && setsockopt(udp6sock, IPPROTO_IPV6,
IPV6_V6ONLY, &one, sizeof one) < 0){
syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket");
exit(1);
}
if (tcp6sock != -1 && setsockopt(tcp6sock, IPPROTO_IPV6,
IPV6_V6ONLY, &one, sizeof one) < 0){
syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket");
exit(1);
}
udpconf = getnetconfigent("udp");
tcpconf = getnetconfigent("tcp");
udp6conf = getnetconfigent("udp6");
tcp6conf = getnetconfigent("tcp6");
rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
if (udpsock != -1 && udpconf != NULL) {
bind_resv_port(udpsock, AF_INET, forcedport);
#ifdef IPSEC
if (policy)
ipsecsetup(AF_INET, udpsock, policy);
#endif
udptransp = svc_dg_create(udpsock, 0, 0);
if (udptransp != NULL) {
if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER1,
mntsrv, udpconf) ||
!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER3,
mntsrv, udpconf))
syslog(LOG_WARNING, "can't register UDP service");
else
xcreated++;
} else
syslog(LOG_WARNING, "can't create UDP service");
}
if (tcpsock != -1 && tcpconf != NULL) {
bind_resv_port(tcpsock, AF_INET, forcedport);
#ifdef IPSEC
if (policy)
ipsecsetup(AF_INET, tcpsock, policy);
#endif
listen(tcpsock, SOMAXCONN);
tcptransp = svc_vc_create(tcpsock, RPC_MAXDATASIZE,
RPC_MAXDATASIZE);
if (tcptransp != NULL) {
if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER1,
mntsrv, tcpconf) ||
!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER3,
mntsrv, tcpconf))
syslog(LOG_WARNING, "can't register TCP service");
else
xcreated++;
} else
syslog(LOG_WARNING, "can't create TCP service");
}
if (udp6sock != -1 && udp6conf != NULL) {
bind_resv_port(udp6sock, AF_INET6, forcedport);
#ifdef IPSEC
if (policy)
ipsecsetup(AF_INET6, tcpsock, policy);
#endif
udp6transp = svc_dg_create(udp6sock, 0, 0);
if (udp6transp != NULL) {
if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER1,
mntsrv, udp6conf) ||
!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER3,
mntsrv, udp6conf))
syslog(LOG_WARNING, "can't register UDP6 service");
else
xcreated++;
} else
syslog(LOG_WARNING, "can't create UDP6 service");
}
if (tcp6sock != -1 && tcp6conf != NULL) {
bind_resv_port(tcp6sock, AF_INET6, forcedport);
#ifdef IPSEC
if (policy)
ipsecsetup(AF_INET6, tcpsock, policy);
#endif
listen(tcp6sock, SOMAXCONN);
tcp6transp = svc_vc_create(tcp6sock, RPC_MAXDATASIZE,
RPC_MAXDATASIZE);
if (tcp6transp != NULL) {
if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER1,
mntsrv, tcp6conf) ||
!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER3,
mntsrv, tcp6conf))
syslog(LOG_WARNING, "can't register TCP6 service");
else
xcreated++;
} else
syslog(LOG_WARNING, "can't create TCP6 service");
}
if (xcreated == 0) {
syslog(LOG_ERR, "could not create any services");
exit(1);
}
if (debug == 0) {
daemon(0, 0);
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
}
pidfile(NULL);
#ifdef MOUNTD_RUMP
sem_post(&gensem);
#endif
svc_run();
syslog(LOG_ERR, "Mountd died");
exit(1);
}
/*
* The mount rpc service
*/
void
mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
{
struct exportlist *ep;
struct dirlist *dp;
struct fhreturn fhr;
struct stat stb;
struct statvfs fsb;
char host[NI_MAXHOST], numerichost[NI_MAXHOST];
int lookup_failed = 1;
struct sockaddr *saddr;
u_short sport;
char rpcpath[RPCMNT_PATHLEN + 1], rdirpath[MAXPATHLEN];
long bad = EACCES;
int defset, hostset, ret;
sigset_t sighup_mask;
struct sockaddr_in6 *sin6;
struct sockaddr_in *sin;
size_t fh_size;
(void)sigemptyset(&sighup_mask);
(void)sigaddset(&sighup_mask, SIGHUP);
saddr = svc_getrpccaller(transp)->buf;
switch (saddr->sa_family) {
case AF_INET6:
sin6 = (struct sockaddr_in6 *)saddr;
sport = ntohs(sin6->sin6_port);
break;
case AF_INET:
sin = (struct sockaddr_in *)saddr;
sport = ntohs(sin->sin_port);
break;
default:
syslog(LOG_ERR, "request from unknown address family");
return;
}
lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
NULL, 0, 0);
if (getnameinfo(saddr, saddr->sa_len, numerichost,
sizeof numerichost, NULL, 0, ninumeric) != 0)
strlcpy(numerichost, "?", sizeof(numerichost));
ret = 0;
switch (rqstp->rq_proc) {
case NULLPROC:
if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
case MOUNTPROC_MNT:
if (debug)
fprintf(stderr,
"got mount request from %s\n", numerichost);
if (!svc_getargs(transp, xdr_dir, rpcpath)) {
if (debug)
fprintf(stderr, "-> garbage args\n");
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 (
#ifndef MOUNTD_RUMP
realpath(rpcpath, rdirpath) == NULL ||
#else
strcpy(rdirpath, rpcpath) == NULL ||
#endif
stat(rdirpath, &stb) < 0 ||
(!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) ||
statvfs1(rdirpath, &fsb, ST_WAIT) < 0) {
(void)chdir("/"); /* Just in case realpath doesn't */
if (debug)
(void)fprintf(stderr, "-> stat failed on %s\n",
rdirpath);
if (!svc_sendreply(transp, (xdrproc_t)xdr_long, (caddr_t) &bad))
syslog(LOG_ERR, "Can't send reply");
return;
}
if (debug)
fprintf(stderr,
"-> dirpath: %s\n", rdirpath);
/* Check in the exports list */
(void)sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
ep = ex_search(&fsb.f_fsidx);
hostset = defset = 0;
if (ep && (chk_host(ep->ex_defdir, saddr, &defset,
&hostset) || ((dp = dirp_search(ep->ex_dirl, rdirpath)) &&
chk_host(dp, saddr, &defset, &hostset)) ||
(defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
scan_tree(ep->ex_dirl, saddr) == 0))) {
if ((hostset & DP_HOSTSET) == 0) {
hostset = defset;
}
if (sport >= IPPORT_RESERVED &&
!(hostset & DP_NORESMNT)) {
syslog(LOG_NOTICE,
"Refused mount RPC from host %s port %d",
numerichost, sport);
svcerr_weakauth(transp);
goto out;
}
fhr.fhr_flag = hostset;
fhr.fhr_vers = rqstp->rq_vers;
/* Get the file handle */
memset(&fhr.fhr_fh, 0, sizeof(fhr.fhr_fh)); /* for v2 */
fh_size = sizeof(fhr.fhr_fh);
if (getfh(rdirpath, &fhr.fhr_fh, &fh_size) < 0) {
bad = errno;
syslog(LOG_ERR, "Can't get fh for %s", rdirpath);
if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
(char *)&bad))
syslog(LOG_ERR, "Can't send reply");
goto out;
}
if ((fhr.fhr_vers == 1 && fh_size > NFSX_V2FH) ||
fh_size > NFSX_V3FHMAX) {
bad = EINVAL; /* XXX */
if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
(char *)&bad))
syslog(LOG_ERR, "Can't send reply");
goto out;
}
fhr.fhr_fhsize = fh_size;
if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, (char *) &fhr))
syslog(LOG_ERR, "Can't send reply");
if (!lookup_failed)
add_mlist(host, rdirpath, hostset);
else
add_mlist(numerichost, rdirpath, hostset);
if (debug)
(void)fprintf(stderr, "Mount successful.\n");
} else {
if (!svc_sendreply(transp, (xdrproc_t)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, (xdrproc_t)xdr_mlist, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
case MOUNTPROC_UMNT:
if (!svc_getargs(transp, xdr_dir, rdirpath)) {
svcerr_decode(transp);
return;
}
if (!lookup_failed)
ret = del_mlist(host, rdirpath, saddr);
ret |= del_mlist(numerichost, rdirpath, saddr);
if (ret) {
svcerr_weakauth(transp);
return;
}
if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
case MOUNTPROC_UMNTALL:
if (!lookup_failed)
ret = del_mlist(host, NULL, saddr);
ret |= del_mlist(numerichost, NULL, saddr);
if (ret) {
svcerr_weakauth(transp);
return;
}
if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
case MOUNTPROC_EXPORT:
case MOUNTPROC_EXPORTALL:
if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, NULL))
syslog(LOG_ERR, "Can't send reply");
return;
default:
svcerr_noproc(transp);
return;
}
}
/*
* Xdr conversion for a dirpath string
*/
static int
xdr_dir(XDR *xdrsp, char *dirp)
{
return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
}
/*
* Xdr routine to generate file handle reply
*/
static 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 = fhrp->fhr_fhsize;
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(XDR *xdrsp, caddr_t cp)
{
struct mountlist *mlp;
int trueval = 1;
int falseval = 0;
char *strp;
mlp = mlhead;
while (mlp) {
if (!xdr_bool(xdrsp, &trueval))
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, &falseval))
return (0);
return (1);
}
/*
* Xdr conversion for export list
*/
int
xdr_explist(XDR *xdrsp, caddr_t cp)
{
struct exportlist *ep;
int falseval = 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, &falseval))
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(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp)
{
struct grouplist *grp;
struct hostlist *hp;
int trueval = 1;
int falseval = 0;
int gotalldir = 0;
char *strp;
if (dp) {
if (put_exlist(dp->dp_left, xdrsp, adp, putdefp))
return (1);
if (!xdr_bool(xdrsp, &trueval))
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, &trueval))
return (1);
strp =
grp->gr_ptr.gt_addrinfo->ai_canonname;
if (!xdr_string(xdrsp, &strp,
RPCMNT_NAMELEN))
return (1);
} else if (grp->gr_type == GT_NET) {
if (!xdr_bool(xdrsp, &trueval))
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, &falseval))
return (1);
if (put_exlist(dp->dp_right, xdrsp, adp, putdefp))
return (1);
}
return (0);
}
static int
parse_host_netgroup(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(const char *line, size_t lineno, struct grouplist *tgrp,
int got_nondir, char *cp, struct exportlist **ep, struct statvfs *fsp)
{
if (!check_dirpath(line, lineno, cp))
return 0;
if (statvfs1(cp, fsp, ST_WAIT) == -1) {
syslog(LOG_ERR, "\"%s\", line %ld: statvfs for `%s' failed: %m",
line, (unsigned long)lineno, cp);
return 0;
}
if ((fsp->f_flag & MNT_AUTOMOUNTED) != 0)
syslog(LOG_ERR, "\"%s\", line %ld: Warning: exporting of "
"automounted fs %s not supported",
line, (unsigned long)lineno, cp);
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.__fsid_val[0] != fsp->f_fsidx.__fsid_val[0] ||
(*ep)->ex_fs.__fsid_val[1] != fsp->f_fsidx.__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_fsidx);
if (*ep == NULL) {
*ep = get_exp();
(*ep)->ex_fs = fsp->f_fsidx;
(*ep)->ex_fsdir = estrdup(fsp->f_mntonname);
if (debug)
(void)fprintf(stderr,
"Making new ep fs=0x%x,0x%x\n",
fsp->f_fsidx.__fsid_val[0], fsp->f_fsidx.__fsid_val[1]);
} else {
if (debug)
(void)fprintf(stderr,
"Found ep fs=0x%x,0x%x\n",
fsp->f_fsidx.__fsid_val[0], fsp->f_fsidx.__fsid_val[1]);
}
}
return 1;
}
/*
* Get the export list
*/
/* ARGSUSED */
void
get_exportlist(int n)
{
struct exportlist *ep, *ep2;
struct grouplist *grp, *tgrp;
struct exportlist **epp;
struct dirlist *dirhead;
struct statvfs fsb, *fsp;
struct addrinfo *ai;
struct uucred 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;
/*
* And delete exports that are in the kernel for all local
* file systems.
*/
num = getmntinfo(&fsp, MNT_NOWAIT);
for (i = 0; i < num; i++) {
struct mountd_exports_list mel;
/* Delete all entries from the export list. */
mel.mel_path = fsp->f_mntonname;
mel.mel_nexports = 0;
if (nfssvc(NFSSVC_SETEXPORTSLIST, &mel) == -1 &&
errno != EOPNOTSUPP)
syslog(LOG_ERR, "Can't delete exports for %s (%m)",
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) {
/*
* Don't exit here; we can still reload the config
* after a SIGHUP.
*/
if (debug)
(void)fprintf(stderr, "Can't open %s: %s\n", exname,
strerror(errno));
return;
}
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)
goto nextline; /* skip empty line */
/*
* Set defaults.
*/
has_host = FALSE;
anon = def_anon;
exflags = MNT_EXPORTED;
got_nondir = 0;
opt_flags = 0;
ep = NULL;
if (noprivports) {
opt_flags |= OP_NORESMNT | OP_NORESPORT;
exflags |= MNT_EXNORESPORT;
}
/*
* 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 */
ai = emalloc(sizeof(struct addrinfo));
ai->ai_flags = 0;
ai->ai_family = AF_INET; /* XXXX */
ai->ai_socktype = SOCK_DGRAM;
/* setting the length to 0 will match anything */
ai->ai_addrlen = 0;
ai->ai_flags = AI_CANONNAME;
ai->ai_canonname = estrdup("Default");
ai->ai_addr = NULL;
ai->ai_next = NULL;
grp->gr_ptr.gt_addrinfo = ai;
} 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_nfssvc(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(tgrp);
}
tgrp = NULL;
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);
}
/*
* Allocate an export list element
*/
static struct exportlist *
get_exp(void)
{
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(void)
{
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(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_t *fsid)
{
#ifdef MOUNTD_RUMP
return exphead;
#else
struct exportlist *ep;
ep = exphead;
while (ep) {
if (ep->ex_fs.__fsid_val[0] == fsid->__fsid_val[0] &&
ep->ex_fs.__fsid_val[1] == fsid->__fsid_val[1])
return (ep);
ep = ep->ex_next;
}
return (ep);
#endif
}
/*
* Add a directory path to the list.
*/
static char *
add_expdir(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(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 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.
*/
static 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(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(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);
}
/*
* Some helper functions for netmasks. They all assume masks in network
* order (big endian).
*/
static int
bitcmp(void *dst, void *src, int bitlen)
{
int i;
u_int8_t *p1 = dst, *p2 = src;
u_int8_t bitmask;
int bytelen, bitsleft;
bytelen = bitlen / 8;
bitsleft = bitlen % 8;
if (debug) {
printf("comparing:\n");
for (i = 0; i < (bitsleft ? bytelen + 1 : bytelen); i++)
printf("%02x", p1[i]);
printf("\n");
for (i = 0; i < (bitsleft ? bytelen + 1 : bytelen); i++)
printf("%02x", p2[i]);
printf("\n");
}
for (i = 0; i < bytelen; i++) {
if (*p1 != *p2)
return 1;
p1++;
p2++;
}
for (i = 0; i < bitsleft; i++) {
bitmask = 1 << (7 - i);
if ((*p1 & bitmask) != (*p2 & bitmask))
return 1;
}
return 0;
}
static int
netpartcmp(struct sockaddr *s1, struct sockaddr *s2, int bitlen)
{
void *src, *dst;
if (s1->sa_family != s2->sa_family)
return 1;
switch (s1->sa_family) {
case AF_INET:
src = &((struct sockaddr_in *)s1)->sin_addr;
dst = &((struct sockaddr_in *)s2)->sin_addr;
if (bitlen > (int)sizeof(((struct sockaddr_in *)s1)->sin_addr) * 8)
return 1;
break;
case AF_INET6:
src = &((struct sockaddr_in6 *)s1)->sin6_addr;
dst = &((struct sockaddr_in6 *)s2)->sin6_addr;
if (((struct sockaddr_in6 *)s1)->sin6_scope_id !=
((struct sockaddr_in6 *)s2)->sin6_scope_id)
return 1;
if (bitlen > (int)sizeof(((struct sockaddr_in6 *)s1)->sin6_addr) * 8)
return 1;
break;
default:
return 1;
}
return bitcmp(src, dst, bitlen);
}
static int
allones(struct sockaddr_storage *ssp, int bitlen)
{
u_int8_t *p;
int bytelen, bitsleft, i;
int zerolen;
switch (ssp->ss_family) {
case AF_INET:
p = (u_int8_t *)&((struct sockaddr_in *)ssp)->sin_addr;
zerolen = sizeof (((struct sockaddr_in *)ssp)->sin_addr);
break;
case AF_INET6:
p = (u_int8_t *)&((struct sockaddr_in6 *)ssp)->sin6_addr;
zerolen = sizeof (((struct sockaddr_in6 *)ssp)->sin6_addr);
break;
default:
return -1;
}
memset(p, 0, zerolen);
bytelen = bitlen / 8;
bitsleft = bitlen % 8;
if (bytelen > zerolen)
return -1;
for (i = 0; i < bytelen; i++)
*p++ = 0xff;
for (i = 0; i < bitsleft; i++)
*p |= 1 << (7 - i);
return 0;
}
static int
sacmp(struct sockaddr *sa1, struct sockaddr *sa2)
{
void *p1, *p2;
int len;
if (sa1->sa_family != sa2->sa_family)
return 1;
switch (sa1->sa_family) {
case AF_INET:
p1 = &((struct sockaddr_in *)sa1)->sin_addr;
p2 = &((struct sockaddr_in *)sa2)->sin_addr;
len = 4;
break;
case AF_INET6:
p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
len = 16;
if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
((struct sockaddr_in6 *)sa2)->sin6_scope_id)
return 1;
break;
default:
return 1;
}
return memcmp(p1, p2, len);
}
/*
* Scan for a host match in a directory tree.
*/
static int
chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
int *hostsetp)
{
struct hostlist *hp;
struct grouplist *grp;
struct addrinfo *ai;
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:
ai = grp->gr_ptr.gt_addrinfo;
for (; ai; ai = ai->ai_next) {
if (!sacmp(ai->ai_addr, saddr)) {
*hostsetp =
(hp->ht_flag | DP_HOSTSET);
return (1);
}
}
break;
case GT_NET:
if (!netpartcmp(saddr,
(struct sockaddr *)
&grp->gr_ptr.gt_net.nt_net,
grp->gr_ptr.gt_net.nt_len)) {
*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(struct dirlist *dp, struct sockaddr *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(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(const char *line, size_t lineno, char **cpp, char **endcpp,
struct exportlist *ep, struct grouplist *grp, int *has_hostp,
int *exflagsp, struct uucred *cr)
{
char *cpoptarg, *cpoptend;
char *cp, *cpopt, savedc, savedc2;
char *endcp = NULL; /* XXX: GCC */
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 (strchr(cpoptarg, '/') != NULL) {
if (debug)
fprintf(stderr, "setting OP_MASKLEN\n");
opt_flags |= OP_MASKLEN;
}
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);
} 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(const char *line, size_t lineno, const char *cp,
struct grouplist *grp)
{
struct addrinfo *ai, hints;
int ecode;
char host[NI_MAXHOST];
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);
}
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_CANONNAME;
hints.ai_protocol = IPPROTO_UDP;
ecode = getaddrinfo(cp, NULL, &hints, &ai);
if (ecode != 0) {
syslog(LOG_ERR, "\"%s\", line %ld: can't get address info for "
"host %s",
line, (long)lineno, cp);
return 1;
}
grp->gr_type = GT_HOST;
grp->gr_ptr.gt_addrinfo = ai;
while (ai != NULL) {
if (ai->ai_canonname == NULL) {
if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
sizeof host, NULL, 0, ninumeric) != 0)
strlcpy(host, "?", sizeof(host));
ai->ai_canonname = estrdup(host);
ai->ai_flags |= AI_CANONNAME;
} else
ai->ai_flags &= ~AI_CANONNAME;
if (debug)
(void)fprintf(stderr, "got host %s\n", ai->ai_canonname);
ai = ai->ai_next;
}
return (0);
}
/*
* Free up an exports list component
*/
static void
free_exp(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(struct hostlist *hp)
{
struct hostlist *hp2;
while (hp) {
hp2 = hp;
hp = hp->ht_next;
free(hp2);
}
}
static struct hostlist *
get_ht(void)
{
struct hostlist *hp;
hp = emalloc(sizeof(struct hostlist));
hp->ht_next = NULL;
hp->ht_flag = 0;
return (hp);
}
/*
* Do the nfssvc syscall to push the export info into the kernel.
*/
static int
do_nfssvc(const char *line, size_t lineno, struct exportlist *ep,
struct grouplist *grp, int exflags, struct uucred *anoncrp,
char *dirp, int dirplen, struct statvfs *fsb)
{
struct sockaddr *addrp;
struct sockaddr_storage ss;
struct addrinfo *ai;
int addrlen;
int done;
struct export_args export;
export.ex_flags = exflags;
export.ex_anon = *anoncrp;
export.ex_indexfile = ep->ex_indexfile;
if (grp->gr_type == GT_HOST) {
ai = grp->gr_ptr.gt_addrinfo;
addrp = ai->ai_addr;
addrlen = ai->ai_addrlen;
} else {
addrp = NULL;
ai = NULL; /* XXXGCC -Wuninitialized */
addrlen = 0; /* XXXGCC -Wuninitialized */
}
done = FALSE;
while (!done) {
struct mountd_exports_list mel;
switch (grp->gr_type) {
case GT_HOST:
if (addrp != NULL && addrp->sa_family == AF_INET6 &&
have_v6 == 0)
goto skip;
export.ex_addr = addrp;
export.ex_addrlen = addrlen;
export.ex_masklen = 0;
break;
case GT_NET:
export.ex_addr = (struct sockaddr *)
&grp->gr_ptr.gt_net.nt_net;
if (export.ex_addr->sa_family == AF_INET6 &&
have_v6 == 0)
goto skip;
export.ex_addrlen = export.ex_addr->sa_len;
memset(&ss, 0, sizeof ss);
ss.ss_family = export.ex_addr->sa_family;
ss.ss_len = export.ex_addr->sa_len;
if (allones(&ss, grp->gr_ptr.gt_net.nt_len) != 0) {
syslog(LOG_ERR,
"\"%s\", line %ld: Bad network flag",
line, (unsigned long)lineno);
return (1);
}
export.ex_mask = (struct sockaddr *)&ss;
export.ex_masklen = ss.ss_len;
break;
default:
syslog(LOG_ERR, "\"%s\", line %ld: Bad netgroup type",
line, (unsigned long)lineno);
return (1);
};
/*
* XXX:
* Maybe I should just use the fsb->f_mntonname path?
*/
mel.mel_path = dirp;
mel.mel_nexports = 1;
mel.mel_exports = &export;
if (nfssvc(NFSSVC_SETEXPORTSLIST, &mel) != 0) {
syslog(LOG_ERR,
"\"%s\", line %ld: Can't change attributes for %s to %s: %m",
line, (unsigned long)lineno,
dirp, (grp->gr_type == GT_HOST) ?
grp->gr_ptr.gt_addrinfo->ai_canonname :
(grp->gr_type == GT_NET) ?
grp->gr_ptr.gt_net.nt_name :
"Unknown");
return (1);
}
skip:
if (addrp) {
ai = ai->ai_next;
if (ai == NULL)
done = TRUE;
else {
addrp = ai->ai_addr;
addrlen = ai->ai_addrlen;
}
} else
done = TRUE;
}
return (0);
}
/*
* Parse out the next white space separated field
*/
static 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;
}
}
/*
* Parse a description of a credential.
*/
static void
parsecred(char *namelist, struct uucred *cr)
{
char *username;
int cnt;
char *names;
struct passwd *pw;
struct group *gr;
int ngroups;
gid_t usergroups[NGROUPS + 1];
/*
* Set up the unprivileged user.
*/
*cr = def_anon;
/*
* Get the user's password table entry.
*/
names = strsep(&namelist, " \t\n");
username = strsep(&names, ":");
if (isdigit((unsigned char)*username) || *username == '-')
pw = getpwuid(atoi(username));
else
pw = getpwnam(username);
/*
* Credentials specified as those of a user.
*/
if (names == NULL) {
if (pw == NULL) {
syslog(LOG_ERR, "Unknown user: %s", username);
return;
}
cr->cr_uid = pw->pw_uid;
ngroups = NGROUPS + 1;
if (getgrouplist(pw->pw_name, pw->pw_gid, usergroups, &ngroups))
syslog(LOG_ERR, "Too many groups for user %s", username);
/*
* Convert from int's to gid_t's and compress out duplicate
*/
cr->cr_ngroups = ngroups - 1;
cr->cr_gid = usergroups[0];
for (cnt = 1; cnt < ngroups; cnt++)
cr->cr_groups[cnt - 1] = usergroups[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((unsigned char)*username) || *username == '-')
cr->cr_uid = atoi(username);
else {
syslog(LOG_ERR, "Unknown user: %s", username);
return;
}
cr->cr_ngroups = 0;
while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) {
username = strsep(&names, ":");
if (isdigit((unsigned char)*username) || *username == '-') {
cr->cr_groups[cr->cr_ngroups++] = atoi(username);
} else {
if ((gr = getgrnam(username)) == NULL) {
syslog(LOG_ERR, "Unknown group: %s", username);
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(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 = 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(char *hostp, char *dirp, struct sockaddr *saddr)
{
struct mountlist *mlp, **mlpp;
struct mountlist *mlp2;
u_short sport;
FILE *mlfile;
int fnd = 0, ret = 0;
char host[NI_MAXHOST];
switch (saddr->sa_family) {
case AF_INET6:
sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
break;
case AF_INET:
sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
break;
default:
return -1;
}
mlpp = &mlhead;
mlp = mlhead;
while (mlp) {
if (!strcmp(mlp->ml_host, hostp) &&
(!dirp || !strcmp(mlp->ml_dirp, dirp))) {
if (!(mlp->ml_flag & DP_NORESMNT) &&
sport >= IPPORT_RESERVED) {
if (getnameinfo(saddr, saddr->sa_len, host,
sizeof host, NULL, 0, ninumeric) != 0)
strlcpy(host, "?", sizeof(host));
syslog(LOG_NOTICE,
"Umount request for %s:%s from %s refused\n",
mlp->ml_host, mlp->ml_dirp, host);
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(char *hostp, char *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);
}
#ifndef MOUNTD_RUMP
static int
umntall_each(caddr_t resultsp, struct sockaddr_in *raddr)
{
return (1);
}
#endif
/*
* This function is called via. SIGTERM when the system is going down.
* It sends a broadcast RPCMNT_UMNTALL.
*/
/* ARGSUSED */
static void
send_umntall(int n)
{
#ifndef MOUNTD_RUMP
(void)clnt_broadcast(RPCPROG_MNT, RPCMNT_VER1, RPCMNT_UMNTALL,
(xdrproc_t)xdr_void, NULL, (xdrproc_t)xdr_void, NULL,
(resultproc_t)umntall_each);
#endif
exit(0);
}
/*
* Free up a group list.
*/
static void
free_grp(struct grouplist *grp)
{
if (grp->gr_type == GT_HOST) {
if (grp->gr_ptr.gt_addrinfo != NULL)
freeaddrinfo(grp->gr_ptr.gt_addrinfo);
} else if (grp->gr_type == GT_NET) {
if (grp->gr_ptr.gt_net.nt_name)
free(grp->gr_ptr.gt_net.nt_name);
}
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(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_MASK) && (opt_flags & OP_MASKLEN) != 0) {
syslog(LOG_ERR, "\"%s\", line %ld: /pref and -mask mutually"
" exclusive",
line, (unsigned long)lineno);
return (1);
}
if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
syslog(LOG_ERR,
"\"%s\", line %ld: -alldirs 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(const char *line, size_t lineno, char *dirp)
{
char *cp;
struct stat sb;
const 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;
}
static void
bind_resv_port(int sock, sa_family_t family, in_port_t port)
{
struct sockaddr *sa;
struct sockaddr_in sasin;
struct sockaddr_in6 sasin6;
switch (family) {
case AF_INET:
(void)memset(&sasin, 0, sizeof(sasin));
sasin.sin_len = sizeof(sasin);
sasin.sin_family = family;
sasin.sin_port = htons(port);
sa = (struct sockaddr *)(void *)&sasin;
break;
case AF_INET6:
(void)memset(&sasin6, 0, sizeof(sasin6));
sasin6.sin6_len = sizeof(sasin6);
sasin6.sin6_family = family;
sasin6.sin6_port = htons(port);
sa = (struct sockaddr *)(void *)&sasin6;
break;
default:
syslog(LOG_ERR, "Unsupported address family %d", family);
return;
}
if (bindresvport_sa(sock, sa) == -1)
syslog(LOG_ERR, "Cannot bind to reserved port %d (%m)", port);
}
/* ARGSUSED */
static void
no_nfs(int sig)
{
syslog(LOG_ERR, "kernel NFS support not present; exiting");
exit(1);
}
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