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freebsd-dev/usr.sbin/mountd/mountd.c
Pawel Jakub Dawidek 8b28aef238 Pidfiles should be created with permission preventing users from opening 
them for reading. When user can open file for reading, he can also
flock(2) it, which can lead to confusions.

Pointed out by:	green
2005-09-16 11:24:28 +00:00

2536 lines
57 KiB
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/*
* 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.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /*not lint*/
#if 0
#ifndef lint
static char sccsid[] = "@(#)mountd.c 8.15 (Berkeley) 5/1/95";
#endif /*not lint*/
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <rpc/rpc.h>
#include <rpc/rpc_com.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <rpcsvc/mount.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfsserver/nfs.h>
#include <ufs/ufs/ufsmount.h>
#include <fs/msdosfs/msdosfsmount.h>
#include <fs/ntfs/ntfsmount.h>
#include <isofs/cd9660/cd9660_mount.h> /* XXX need isofs in include */
#include <arpa/inet.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <grp.h>
#include <libutil.h>
#include <limits.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "pathnames.h"
#ifdef DEBUG
#include <stdarg.h>
#endif
/*
* 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;
char *ex_indexfile;
};
/* ex_flag bits */
#define EX_LINKED 0x1
struct netmsk {
struct sockaddr_storage nt_net;
struct sockaddr_storage nt_mask;
char *nt_name;
};
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
#define GT_DEFAULT 0x3
#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 checkmask(struct sockaddr *sa);
int chk_host(struct dirlist *, struct sockaddr *, int *, int *);
void del_mlist(char *hostp, char *dirp);
struct dirlist *dirp_search(struct dirlist *, char *);
int do_mount(struct exportlist *, struct grouplist *, int,
struct xucred *, char *, int, struct statfs *);
int do_opt(char **, char **, struct exportlist *, struct grouplist *,
int *, int *, struct xucred *);
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 get_exportlist(void);
int get_host(char *, struct grouplist *, struct grouplist *);
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 huphandler(int sig);
int makemask(struct sockaddr_storage *ssp, int bitlen);
void mntsrv(struct svc_req *, SVCXPRT *);
void nextfield(char **, char **);
void out_of_mem(void);
void parsecred(char *, struct xucred *);
int put_exlist(struct dirlist *, XDR *, struct dirlist *, int *, int);
void *sa_rawaddr(struct sockaddr *sa, int *nbytes);
int sacmp(struct sockaddr *sa1, struct sockaddr *sa2,
struct sockaddr *samask);
int scan_tree(struct dirlist *, struct sockaddr *);
static void usage(void);
int xdr_dir(XDR *, char *);
int xdr_explist(XDR *, caddr_t);
int xdr_explist_brief(XDR *, caddr_t);
int xdr_fhs(XDR *, caddr_t);
int xdr_mlist(XDR *, caddr_t);
void terminate(int);
struct exportlist *exphead;
struct mountlist *mlhead;
struct grouplist *grphead;
char exname[MAXPATHLEN];
struct xucred def_anon = {
XUCRED_VERSION,
(uid_t)-2,
1,
{ (gid_t)-2 },
NULL
};
int force_v2 = 0;
int resvport_only = 1;
int dir_only = 1;
int dolog = 0;
int got_sighup = 0;
int opt_flags;
static int have_v6 = 1;
struct pidfh *pfh = NULL;
/* Bits for opt_flags above */
#define OP_MAPROOT 0x01
#define OP_MAPALL 0x02
/* 0x4 free */
#define OP_MASK 0x08
#define OP_NET 0x10
#define OP_ALLDIRS 0x40
#define OP_HAVEMASK 0x80 /* A mask was specified or inferred. */
#define OP_QUIET 0x100
#define OP_MASKLEN 0x200
#ifdef DEBUG
int debug = 1;
void SYSLOG(int, const char *, ...) __printflike(2, 3);
#define syslog SYSLOG
#else
int debug = 0;
#endif
/*
* Mountd server for NFS mount protocol as described in:
* NFS: Network File System Protocol Specification, RFC1094, Appendix A
* The optional arguments are the exports file name
* default: _PATH_EXPORTS
* and "-n" to allow nonroot mount.
*/
int
main(argc, argv)
int argc;
char **argv;
{
fd_set readfds;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
char *endptr;
SVCXPRT *udptransp, *tcptransp, *udp6transp, *tcp6transp;
struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
pid_t otherpid;
int udpsock, tcpsock, udp6sock, tcp6sock;
int xcreated = 0, s;
int maxrec = RPC_MAXDATASIZE;
int one = 1;
int c, r;
in_port_t svcport = 0;
udp6conf = tcp6conf = NULL;
udp6sock = tcp6sock = 0;
/* Check that another mountd isn't already running. */
pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid);
if (pfh == NULL) {
if (errno == EEXIST)
errx(1, "mountd already running, pid: %d.", otherpid);
warn("cannot open or create pidfile");
}
s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if (s < 0)
have_v6 = 0;
else
close(s);
if (modfind("nfsserver") < 0) {
/* Not present in kernel, try loading it */
if (kldload("nfsserver") < 0 || modfind("nfsserver") < 0)
errx(1, "NFS server is not available or loadable");
}
while ((c = getopt(argc, argv, "2dlnp:r")) != -1)
switch (c) {
case '2':
force_v2 = 1;
break;
case 'n':
resvport_only = 0;
break;
case 'r':
dir_only = 0;
break;
case 'd':
debug = debug ? 0 : 1;
break;
case 'l':
dolog = 1;
break;
case 'p':
endptr = NULL;
svcport = (in_port_t)strtoul(optarg, &endptr, 10);
if (endptr == NULL || *endptr != '\0' ||
svcport == 0 || svcport >= IPPORT_MAX)
usage();
break;
default:
usage();
};
argc -= optind;
argv += optind;
grphead = (struct grouplist *)NULL;
exphead = (struct exportlist *)NULL;
mlhead = (struct mountlist *)NULL;
if (argc == 1) {
strncpy(exname, *argv, MAXPATHLEN-1);
exname[MAXPATHLEN-1] = '\0';
} else
strcpy(exname, _PATH_EXPORTS);
openlog("mountd", LOG_PID, LOG_DAEMON);
if (debug)
warnx("getting export list");
get_exportlist();
if (debug)
warnx("getting mount list");
get_mountlist();
if (debug)
warnx("here we go");
if (debug == 0) {
daemon(0, 0);
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
}
signal(SIGHUP, huphandler);
signal(SIGTERM, terminate);
pidfile_write(pfh);
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);
udpconf = getnetconfigent("udp");
tcpconf = getnetconfigent("tcp");
rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
if (!have_v6)
goto skip_v6;
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 TCP socket");
exit(1);
}
udp6conf = getnetconfigent("udp6");
tcp6conf = getnetconfigent("tcp6");
skip_v6:
if (!resvport_only) {
if (sysctlbyname("vfs.nfsrv.nfs_privport", NULL, NULL,
&resvport_only, sizeof(resvport_only)) != 0 &&
errno != ENOENT) {
syslog(LOG_ERR, "sysctl: %m");
exit(1);
}
}
if (svcport != 0) {
bzero(&sin, sizeof(struct sockaddr_in));
sin.sin_len = sizeof(struct sockaddr_in);
sin.sin_family = AF_INET;
sin.sin_port = htons(svcport);
bzero(&sin6, sizeof(struct sockaddr_in6));
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_family = AF_INET6;
sin6.sin6_port = htons(svcport);
}
if (udpsock != -1 && udpconf != NULL) {
if (svcport != 0) {
r = bindresvport(udpsock, &sin);
if (r != 0) {
syslog(LOG_ERR, "bindresvport: %m");
exit(1);
}
} else
(void)bindresvport(udpsock, NULL);
udptransp = svc_dg_create(udpsock, 0, 0);
if (udptransp != NULL) {
if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER1,
mntsrv, udpconf))
syslog(LOG_WARNING, "can't register UDP RPCMNT_VER1 service");
else
xcreated++;
if (!force_v2) {
if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER3,
mntsrv, udpconf))
syslog(LOG_WARNING, "can't register UDP RPCMNT_VER3 service");
else
xcreated++;
}
} else
syslog(LOG_WARNING, "can't create UDP services");
}
if (tcpsock != -1 && tcpconf != NULL) {
if (svcport != 0) {
r = bindresvport(tcpsock, &sin);
if (r != 0) {
syslog(LOG_ERR, "bindresvport: %m");
exit(1);
}
} else
(void)bindresvport(tcpsock, NULL);
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))
syslog(LOG_WARNING, "can't register TCP RPCMNT_VER1 service");
else
xcreated++;
if (!force_v2) {
if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER3,
mntsrv, tcpconf))
syslog(LOG_WARNING, "can't register TCP RPCMNT_VER3 service");
else
xcreated++;
}
} else
syslog(LOG_WARNING, "can't create TCP service");
}
if (have_v6 && udp6sock != -1 && udp6conf != NULL) {
if (svcport != 0) {
r = bindresvport_sa(udp6sock,
(struct sockaddr *)&sin6);
if (r != 0) {
syslog(LOG_ERR, "bindresvport_sa: %m");
exit(1);
}
} else
(void)bindresvport_sa(udp6sock, NULL);
udp6transp = svc_dg_create(udp6sock, 0, 0);
if (udp6transp != NULL) {
if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER1,
mntsrv, udp6conf))
syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER1 service");
else
xcreated++;
if (!force_v2) {
if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER3,
mntsrv, udp6conf))
syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER3 service");
else
xcreated++;
}
} else
syslog(LOG_WARNING, "can't create UDP6 service");
}
if (have_v6 && tcp6sock != -1 && tcp6conf != NULL) {
if (svcport != 0) {
r = bindresvport_sa(tcp6sock,
(struct sockaddr *)&sin6);
if (r != 0) {
syslog(LOG_ERR, "bindresvport_sa: %m");
exit(1);
}
} else
(void)bindresvport_sa(tcp6sock, NULL);
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))
syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER1 service");
else
xcreated++;
if (!force_v2) {
if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER3,
mntsrv, tcp6conf))
syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER3 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);
}
/* Expand svc_run() here so that we can call get_exportlist(). */
for (;;) {
if (got_sighup) {
get_exportlist();
got_sighup = 0;
}
readfds = svc_fdset;
switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
case -1:
if (errno == EINTR)
continue;
syslog(LOG_ERR, "mountd died: select: %m");
exit(1);
case 0:
continue;
default:
svc_getreqset(&readfds);
}
}
}
static void
usage()
{
fprintf(stderr,
"usage: mountd [-2] [-d] [-l] [-n] [-p <port>] [-r] "
"[export_file]\n");
exit(1);
}
/*
* The mount rpc service
*/
void
mntsrv(rqstp, transp)
struct svc_req *rqstp;
SVCXPRT *transp;
{
struct exportlist *ep;
struct dirlist *dp;
struct fhreturn fhr;
struct stat stb;
struct statfs fsb;
char host[NI_MAXHOST], numerichost[NI_MAXHOST];
int lookup_failed = 1;
struct sockaddr *saddr;
u_short sport;
char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN];
int bad = 0, defset, hostset;
sigset_t sighup_mask;
sigemptyset(&sighup_mask);
sigaddset(&sighup_mask, SIGHUP);
saddr = svc_getrpccaller(transp)->buf;
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:
syslog(LOG_ERR, "request from unknown address family");
return;
}
lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
NULL, 0, 0);
getnameinfo(saddr, saddr->sa_len, numerichost,
sizeof numerichost, NULL, 0, NI_NUMERICHOST);
switch (rqstp->rq_proc) {
case NULLPROC:
if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
syslog(LOG_ERR, "can't send reply");
return;
case RPCMNT_MOUNT:
if (sport >= IPPORT_RESERVED && resvport_only) {
syslog(LOG_NOTICE,
"mount request from %s from unprivileged port",
numerichost);
svcerr_weakauth(transp);
return;
}
if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
syslog(LOG_NOTICE, "undecodable mount request from %s",
numerichost);
svcerr_decode(transp);
return;
}
/*
* Get the real pathname and make sure it is a directory
* or a regular file if the -r option was specified
* and it exists.
*/
if (realpath(rpcpath, dirpath) == NULL ||
stat(dirpath, &stb) < 0 ||
(!S_ISDIR(stb.st_mode) &&
(dir_only || !S_ISREG(stb.st_mode))) ||
statfs(dirpath, &fsb) < 0) {
chdir("/"); /* Just in case realpath doesn't */
syslog(LOG_NOTICE,
"mount request from %s for non existent path %s",
numerichost, dirpath);
if (debug)
warnx("stat failed on %s", 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, (xdrproc_t)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) {
bad = errno;
syslog(LOG_ERR, "can't get fh for %s", dirpath);
if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
(caddr_t)&bad))
syslog(LOG_ERR, "can't send reply");
sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
return;
}
if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs,
(caddr_t)&fhr))
syslog(LOG_ERR, "can't send reply");
if (!lookup_failed)
add_mlist(host, dirpath);
else
add_mlist(numerichost, dirpath);
if (debug)
warnx("mount successful");
if (dolog)
syslog(LOG_NOTICE,
"mount request succeeded from %s for %s",
numerichost, dirpath);
} else {
bad = EACCES;
syslog(LOG_NOTICE,
"mount request denied from %s for %s",
numerichost, dirpath);
}
if (bad && !svc_sendreply(transp, (xdrproc_t)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, (xdrproc_t)xdr_mlist, (caddr_t)NULL))
syslog(LOG_ERR, "can't send reply");
else if (dolog)
syslog(LOG_NOTICE,
"dump request succeeded from %s",
numerichost);
return;
case RPCMNT_UMOUNT:
if (sport >= IPPORT_RESERVED && resvport_only) {
syslog(LOG_NOTICE,
"umount request from %s from unprivileged port",
numerichost);
svcerr_weakauth(transp);
return;
}
if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
syslog(LOG_NOTICE, "undecodable umount request from %s",
numerichost);
svcerr_decode(transp);
return;
}
if (realpath(rpcpath, dirpath) == NULL) {
syslog(LOG_NOTICE, "umount request from %s "
"for non existent path %s",
numerichost, dirpath);
}
if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
syslog(LOG_ERR, "can't send reply");
if (!lookup_failed)
del_mlist(host, dirpath);
del_mlist(numerichost, dirpath);
if (dolog)
syslog(LOG_NOTICE,
"umount request succeeded from %s for %s",
numerichost, dirpath);
return;
case RPCMNT_UMNTALL:
if (sport >= IPPORT_RESERVED && resvport_only) {
syslog(LOG_NOTICE,
"umountall request from %s from unprivileged port",
numerichost);
svcerr_weakauth(transp);
return;
}
if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
syslog(LOG_ERR, "can't send reply");
if (!lookup_failed)
del_mlist(host, NULL);
del_mlist(numerichost, NULL);
if (dolog)
syslog(LOG_NOTICE,
"umountall request succeeded from %s",
numerichost);
return;
case RPCMNT_EXPORT:
if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL))
if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief,
(caddr_t)NULL))
syslog(LOG_ERR, "can't send reply");
if (dolog)
syslog(LOG_NOTICE,
"export request succeeded from %s",
numerichost);
return;
default:
svcerr_noproc(transp);
return;
}
}
/*
* Xdr conversion for a dirpath string
*/
int
xdr_dir(xdrsp, dirp)
XDR *xdrsp;
char *dirp;
{
return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
}
/*
* Xdr routine to generate file handle reply
*/
int
xdr_fhs(xdrsp, cp)
XDR *xdrsp;
caddr_t cp;
{
struct fhreturn *fhrp = (struct fhreturn *)cp;
u_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(xdrsp, cp)
XDR *xdrsp;
caddr_t cp;
{
struct mountlist *mlp;
int true = 1;
int false = 0;
char *strp;
mlp = mlhead;
while (mlp) {
if (!xdr_bool(xdrsp, &true))
return (0);
strp = &mlp->ml_host[0];
if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
return (0);
strp = &mlp->ml_dirp[0];
if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
return (0);
mlp = mlp->ml_next;
}
if (!xdr_bool(xdrsp, &false))
return (0);
return (1);
}
/*
* Xdr conversion for export list
*/
int
xdr_explist_common(xdrsp, cp, brief)
XDR *xdrsp;
caddr_t cp;
int brief;
{
struct exportlist *ep;
int false = 0;
int 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, brief))
goto errout;
if (ep->ex_defdir && putdef == 0 &&
put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
&putdef, brief))
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(dp, xdrsp, adp, putdefp, brief)
struct dirlist *dp;
XDR *xdrsp;
struct dirlist *adp;
int *putdefp;
int brief;
{
struct grouplist *grp;
struct hostlist *hp;
int true = 1;
int false = 0;
int gotalldir = 0;
char *strp;
if (dp) {
if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
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 (brief) {
if (!xdr_bool(xdrsp, &true))
return (1);
strp = "(...)";
if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
return (1);
} else 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_addrinfo->ai_canonname;
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 == (struct hostlist *)NULL) {
hp = adp->dp_hosts;
gotalldir = 0;
}
}
}
if (!xdr_bool(xdrsp, &false))
return (1);
if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
return (1);
}
return (0);
}
int
xdr_explist(xdrsp, cp)
XDR *xdrsp;
caddr_t cp;
{
return xdr_explist_common(xdrsp, cp, 0);
}
int
xdr_explist_brief(xdrsp, cp)
XDR *xdrsp;
caddr_t cp;
{
return xdr_explist_common(xdrsp, cp, 1);
}
char *line;
int linesize;
FILE *exp_file;
/*
* Get the export list
*/
void
get_exportlist()
{
struct exportlist *ep, *ep2;
struct grouplist *grp, *tgrp;
struct exportlist **epp;
struct dirlist *dirhead;
struct statfs fsb, *fsp;
struct xucred anon;
char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp;
dirp = NULL;
dirplen = 0;
/*
* First, get rid of the old list
*/
ep = exphead;
while (ep) {
ep2 = ep;
ep = ep->ex_next;
free_exp(ep2);
}
exphead = (struct exportlist *)NULL;
grp = grphead;
while (grp) {
tgrp = grp;
grp = grp->gr_next;
free_grp(tgrp);
}
grphead = (struct grouplist *)NULL;
/*
* And delete exports that are in the kernel for all local
* filesystems.
* XXX: Should know how to handle all local exportable filesystems
* instead of just "ufs".
*/
num = getmntinfo(&fsp, MNT_NOWAIT);
for (i = 0; i < num; i++) {
union {
struct ufs_args ua;
struct iso_args ia;
struct msdosfs_args da;
struct ntfs_args na;
} targs;
if (!strcmp(fsp->f_fstypename, "ufs") ||
!strcmp(fsp->f_fstypename, "msdosfs") ||
!strcmp(fsp->f_fstypename, "ntfs") ||
!strcmp(fsp->f_fstypename, "cd9660")) {
bzero(&targs, sizeof targs);
targs.ua.fspec = NULL;
targs.ua.export.ex_flags = MNT_DELEXPORT;
if (mount(fsp->f_fstypename, fsp->f_mntonname,
fsp->f_flags | MNT_UPDATE, (caddr_t)&targs) < 0 &&
errno != ENOENT)
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) {
syslog(LOG_ERR, "can't open %s", exname);
exit(2);
}
dirhead = (struct dirlist *)NULL;
while (get_line()) {
if (debug)
warnx("got line %s", line);
cp = line;
nextfield(&cp, &endcp);
if (*cp == '#')
goto nextline;
/*
* Set defaults.
*/
has_host = FALSE;
anon = def_anon;
exflags = MNT_EXPORTED;
got_nondir = 0;
opt_flags = 0;
ep = (struct exportlist *)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 == (struct exportlist *)NULL) {
getexp_err(ep, tgrp);
goto nextline;
}
if (debug)
warnx("doing opt %s", 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 == (struct exportlist *)NULL) {
ep = get_exp();
ep->ex_fs = fsb.f_fsid;
ep->ex_fsdir = (char *)
malloc(strlen(fsb.f_mntonname) + 1);
if (ep->ex_fsdir)
strcpy(ep->ex_fsdir,
fsb.f_mntonname);
else
out_of_mem();
if (debug)
warnx("making new ep fs=0x%x,0x%x",
fsb.f_fsid.val[0],
fsb.f_fsid.val[1]);
} else if (debug)
warnx("found ep fs=0x%x,0x%x",
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 == (struct exportlist *)NULL) {
getexp_err(ep, tgrp);
goto nextline;
}
/*
* Get the host or netgroup.
*/
setnetgrent(cp);
netgrp = getnetgrent(&hst, &usr, &dom);
do {
if (has_host) {
grp->gr_next = get_grp();
grp = grp->gr_next;
}
if (netgrp) {
if (hst == 0) {
syslog(LOG_ERR,
"null hostname in netgroup %s, skipping", cp);
grp->gr_type = GT_IGNORE;
} else if (get_host(hst, grp, tgrp)) {
syslog(LOG_ERR,
"bad host %s in netgroup %s, skipping", hst, cp);
grp->gr_type = GT_IGNORE;
}
} else if (get_host(cp, grp, tgrp)) {
syslog(LOG_ERR, "bad host %s, skipping", cp);
grp->gr_type = GT_IGNORE;
}
has_host = TRUE;
} while (netgrp && getnetgrent(&hst, &usr, &dom));
endnetgrent();
*endcp = savedc;
}
cp = endcp;
nextfield(&cp, &endcp);
len = endcp - cp;
}
if (check_options(dirhead)) {
getexp_err(ep, tgrp);
goto nextline;
}
if (!has_host) {
grp->gr_type = GT_DEFAULT;
if (debug)
warnx("adding a default entry");
/*
* 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) {
syslog(LOG_ERR, "network/host conflict");
getexp_err(ep, tgrp);
goto nextline;
/*
* If an export list was specified on this line, make sure
* that we have at least one valid entry, otherwise skip it.
*/
} else {
grp = tgrp;
while (grp && grp->gr_type == GT_IGNORE)
grp = grp->gr_next;
if (! grp) {
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 {
if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
&fsb)) {
getexp_err(ep, tgrp);
goto nextline;
}
} 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, (struct grouplist *)NULL, ep,
opt_flags);
free_grp(grp);
}
dirhead = (struct dirlist *)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 = (struct dirlist *)NULL;
}
}
fclose(exp_file);
}
/*
* Allocate an export list element
*/
struct exportlist *
get_exp()
{
struct exportlist *ep;
ep = (struct exportlist *)malloc(sizeof (struct exportlist));
if (ep == (struct exportlist *)NULL)
out_of_mem();
memset(ep, 0, sizeof(struct exportlist));
return (ep);
}
/*
* Allocate a group list element
*/
struct grouplist *
get_grp()
{
struct grouplist *gp;
gp = (struct grouplist *)malloc(sizeof (struct grouplist));
if (gp == (struct grouplist *)NULL)
out_of_mem();
memset(gp, 0, sizeof(struct grouplist));
return (gp);
}
/*
* Clean up upon an error in get_exportlist().
*/
void
getexp_err(ep, grp)
struct exportlist *ep;
struct grouplist *grp;
{
struct grouplist *tgrp;
if (!(opt_flags & OP_QUIET))
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)
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(dpp, cp, len)
struct dirlist **dpp;
char *cp;
int len;
{
struct dirlist *dp;
dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
if (dp == (struct dirlist *)NULL)
out_of_mem();
dp->dp_left = *dpp;
dp->dp_right = (struct dirlist *)NULL;
dp->dp_flag = 0;
dp->dp_hosts = (struct hostlist *)NULL;
strcpy(dp->dp_dirp, cp);
*dpp = dp;
return (dp->dp_dirp);
}
/*
* Hang the dir list element off the dirpath binary tree as required
* and update the entry for host.
*/
void
hang_dirp(dp, grp, ep, flags)
struct dirlist *dp;
struct grouplist *grp;
struct exportlist *ep;
int flags;
{
struct hostlist *hp;
struct dirlist *dp2;
if (flags & OP_ALLDIRS) {
if (ep->ex_defdir)
free((caddr_t)dp);
else
ep->ex_defdir = dp;
if (grp == (struct grouplist *)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(dpp, newdp, grp, flags)
struct dirlist **dpp;
struct dirlist *newdp;
struct grouplist *grp;
int flags;
{
struct dirlist *dp;
struct hostlist *hp;
int cmp;
dp = *dpp;
if (dp) {
cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
if (cmp > 0) {
add_dlist(&dp->dp_left, newdp, grp, flags);
return;
} else if (cmp < 0) {
add_dlist(&dp->dp_right, newdp, grp, flags);
return;
} else
free((caddr_t)newdp);
} else {
dp = newdp;
dp->dp_left = (struct dirlist *)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(dp, dirp)
struct dirlist *dp;
char *dirp;
{
int cmp;
if (dp) {
cmp = strcmp(dp->dp_dirp, dirp);
if (cmp > 0)
return (dirp_search(dp->dp_left, dirp));
else if (cmp < 0)
return (dirp_search(dp->dp_right, dirp));
else
return (dp);
}
return (dp);
}
/*
* Scan for a host match in a directory tree.
*/
int
chk_host(dp, saddr, defsetp, hostsetp)
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, NULL)) {
*hostsetp =
(hp->ht_flag | DP_HOSTSET);
return (1);
}
}
break;
case GT_NET:
if (!sacmp(saddr, (struct sockaddr *)
&grp->gr_ptr.gt_net.nt_net,
(struct sockaddr *)
&grp->gr_ptr.gt_net.nt_mask)) {
*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(dp, saddr)
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.
*/
void
free_dir(dp)
struct dirlist *dp;
{
if (dp) {
free_dir(dp->dp_left);
free_dir(dp->dp_right);
free_host(dp->dp_hosts);
free((caddr_t)dp);
}
}
/*
* Parse the option string and update fields.
* Option arguments may either be -<option>=<value> or
* -<option> <value>
*/
int
do_opt(cpp, endcpp, ep, grp, has_hostp, exflagsp, cr)
char **cpp, **endcpp;
struct exportlist *ep;
struct grouplist *grp;
int *has_hostp;
int *exflagsp;
struct xucred *cr;
{
char *cpoptarg, *cpoptend;
char *cp, *endcp, *cpopt, savedc, savedc2;
int allflag, usedarg;
savedc2 = '\0';
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 (strchr(cpoptarg, '/') != NULL) {
if (debug)
fprintf(stderr, "setting OP_MASKLEN\n");
opt_flags |= OP_MASKLEN;
}
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 if (!strcmp(cpopt, "public")) {
*exflagsp |= MNT_EXPUBLIC;
} else if (!strcmp(cpopt, "webnfs")) {
*exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
opt_flags |= OP_MAPALL;
} else if (cpoptarg && !strcmp(cpopt, "index")) {
ep->ex_indexfile = strdup(cpoptarg);
} else if (!strcmp(cpopt, "quiet")) {
opt_flags |= OP_QUIET;
} 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(cp, grp, tgrp)
char *cp;
struct grouplist *grp;
struct grouplist *tgrp;
{
struct grouplist *checkgrp;
struct addrinfo *ai, *tai, hints;
int ecode;
char host[NI_MAXHOST];
if (grp->gr_type != GT_NULL) {
syslog(LOG_ERR, "Bad netgroup type for ip host %s", 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,"can't get address info for host %s", cp);
return 1;
}
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, NI_NUMERICHOST) != 0)
strlcpy(host, "?", sizeof(host));
ai->ai_canonname = strdup(host);
ai->ai_flags |= AI_CANONNAME;
}
if (debug)
fprintf(stderr, "got host %s\n", ai->ai_canonname);
/*
* Sanity check: make sure we don't already have an entry
* for this host in the grouplist.
*/
for (checkgrp = tgrp; checkgrp != NULL;
checkgrp = checkgrp->gr_next) {
if (checkgrp->gr_type != GT_HOST)
continue;
for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
tai = tai->ai_next) {
if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
continue;
if (debug)
fprintf(stderr,
"ignoring duplicate host %s\n",
ai->ai_canonname);
grp->gr_type = GT_IGNORE;
return (0);
}
}
ai = ai->ai_next;
}
grp->gr_type = GT_HOST;
return (0);
}
/*
* Free up an exports list component
*/
void
free_exp(ep)
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);
if (ep->ex_indexfile)
free(ep->ex_indexfile);
free_dir(ep->ex_dirl);
free((caddr_t)ep);
}
/*
* Free hosts.
*/
void
free_host(hp)
struct hostlist *hp;
{
struct hostlist *hp2;
while (hp) {
hp2 = hp;
hp = hp->ht_next;
free((caddr_t)hp2);
}
}
struct hostlist *
get_ht()
{
struct hostlist *hp;
hp = (struct hostlist *)malloc(sizeof (struct hostlist));
if (hp == (struct hostlist *)NULL)
out_of_mem();
hp->ht_next = (struct hostlist *)NULL;
hp->ht_flag = 0;
return (hp);
}
/*
* Out of memory, fatal
*/
void
out_of_mem()
{
syslog(LOG_ERR, "out of memory");
exit(2);
}
/*
* Do the mount syscall with the update flag to push the export info into
* the kernel.
*/
int
do_mount(ep, grp, exflags, anoncrp, dirp, dirplen, fsb)
struct exportlist *ep;
struct grouplist *grp;
int exflags;
struct xucred *anoncrp;
char *dirp;
int dirplen;
struct statfs *fsb;
{
struct statfs fsb1;
struct addrinfo *ai;
struct export_args *eap;
char *cp = NULL;
int done;
char savedc = '\0';
union {
struct ufs_args ua;
struct iso_args ia;
struct msdosfs_args da;
struct ntfs_args na;
} args;
bzero(&args, sizeof args);
/* XXX, we assume that all xx_args look like ufs_args. */
args.ua.fspec = 0;
eap = &args.ua.export;
eap->ex_flags = exflags;
eap->ex_anon = *anoncrp;
eap->ex_indexfile = ep->ex_indexfile;
if (grp->gr_type == GT_HOST)
ai = grp->gr_ptr.gt_addrinfo;
else
ai = NULL;
done = FALSE;
while (!done) {
switch (grp->gr_type) {
case GT_HOST:
if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
goto skip;
eap->ex_addr = ai->ai_addr;
eap->ex_addrlen = ai->ai_addrlen;
eap->ex_masklen = 0;
break;
case GT_NET:
if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
have_v6 == 0)
goto skip;
eap->ex_addr =
(struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
eap->ex_addrlen = args.ua.export.ex_addr->sa_len;
eap->ex_mask =
(struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
eap->ex_masklen = args.ua.export.ex_mask->sa_len;
break;
case GT_DEFAULT:
eap->ex_addr = NULL;
eap->ex_addrlen = 0;
eap->ex_mask = NULL;
eap->ex_masklen = 0;
break;
case GT_IGNORE:
return(0);
break;
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 filesystems and not just "ufs".
*/
while (mount(fsb->f_fstypename, dirp,
fsb->f_flags | MNT_UPDATE, (caddr_t)&args) < 0) {
if (cp)
*cp-- = savedc;
else
cp = dirp + dirplen - 1;
if (opt_flags & OP_QUIET)
return (1);
if (errno == EPERM) {
if (debug)
warnx("can't change attributes for %s",
dirp);
syslog(LOG_ERR,
"can't change attributes for %s", dirp);
return (1);
}
if (opt_flags & OP_ALLDIRS) {
if (errno == EINVAL)
syslog(LOG_ERR,
"-alldirs requested but %s is not a filesystem mountpoint",
dirp);
else
syslog(LOG_ERR,
"could not remount %s: %m",
dirp);
return (1);
}
/* back up over the last component */
while (*cp == '/' && cp > dirp)
cp--;
while (*(cp - 1) != '/' && cp > dirp)
cp--;
if (cp == dirp) {
if (debug)
warnx("mnt unsucc");
syslog(LOG_ERR, "can't export %s", dirp);
return (1);
}
savedc = *cp;
*cp = '\0';
/* Check that we're still on the same filesystem. */
if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid,
&fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) {
*cp = savedc;
syslog(LOG_ERR, "can't export %s", dirp);
return (1);
}
}
skip:
if (ai != NULL)
ai = ai->ai_next;
if (ai == NULL)
done = TRUE;
}
if (cp)
*cp = savedc;
return (0);
}
/*
* Translate a net address.
*
* If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
*/
int
get_net(cp, net, maskflg)
char *cp;
struct netmsk *net;
int maskflg;
{
struct netent *np = NULL;
char *name, *p, *prefp;
struct sockaddr_in sin;
struct sockaddr *sa = NULL;
struct addrinfo hints, *ai = NULL;
char netname[NI_MAXHOST];
long preflen;
p = prefp = NULL;
if ((opt_flags & OP_MASKLEN) && !maskflg) {
p = strchr(cp, '/');
*p = '\0';
prefp = p + 1;
}
/*
* Check for a numeric address first. We wish to avoid
* possible DNS lookups in getnetbyname().
*/
if (isxdigit(*cp) || *cp == ':') {
memset(&hints, 0, sizeof hints);
/* Ensure the mask and the network have the same family. */
if (maskflg && (opt_flags & OP_NET))
hints.ai_family = net->nt_net.ss_family;
else if (!maskflg && (opt_flags & OP_HAVEMASK))
hints.ai_family = net->nt_mask.ss_family;
else
hints.ai_family = AF_UNSPEC;
hints.ai_flags = AI_NUMERICHOST;
if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
sa = ai->ai_addr;
if (sa != NULL && ai->ai_family == AF_INET) {
/*
* The address in `cp' is really a network address, so
* use inet_network() to re-interpret this correctly.
* e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
*/
bzero(&sin, sizeof sin);
sin.sin_family = AF_INET;
sin.sin_len = sizeof sin;
sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
if (debug)
fprintf(stderr, "get_net: v4 addr %s\n",
inet_ntoa(sin.sin_addr));
sa = (struct sockaddr *)&sin;
}
}
if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
bzero(&sin, sizeof sin);
sin.sin_family = AF_INET;
sin.sin_len = sizeof sin;
sin.sin_addr = inet_makeaddr(np->n_net, 0);
sa = (struct sockaddr *)&sin;
}
if (sa == NULL)
goto fail;
if (maskflg) {
/* The specified sockaddr is a mask. */
if (checkmask(sa) != 0)
goto fail;
bcopy(sa, &net->nt_mask, sa->sa_len);
opt_flags |= OP_HAVEMASK;
} else {
/* The specified sockaddr is a network address. */
bcopy(sa, &net->nt_net, sa->sa_len);
/* Get a network name for the export list. */
if (np) {
name = np->n_name;
} else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
NULL, 0, NI_NUMERICHOST) == 0) {
name = netname;
} else {
goto fail;
}
if ((net->nt_name = strdup(name)) == NULL)
out_of_mem();
/*
* Extract a mask from either a "/<masklen>" suffix, or
* from the class of an IPv4 address.
*/
if (opt_flags & OP_MASKLEN) {
preflen = strtol(prefp, NULL, 10);
if (preflen < 0L || preflen == LONG_MAX)
goto fail;
bcopy(sa, &net->nt_mask, sa->sa_len);
if (makemask(&net->nt_mask, (int)preflen) != 0)
goto fail;
opt_flags |= OP_HAVEMASK;
*p = '/';
} else if (sa->sa_family == AF_INET &&
(opt_flags & OP_MASK) == 0) {
in_addr_t addr;
addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
if (IN_CLASSA(addr))
preflen = 8;
else if (IN_CLASSB(addr))
preflen = 16;
else if (IN_CLASSC(addr))
preflen = 24;
else if (IN_CLASSD(addr))
preflen = 28;
else
preflen = 32; /* XXX */
bcopy(sa, &net->nt_mask, sa->sa_len);
makemask(&net->nt_mask, (int)preflen);
opt_flags |= OP_HAVEMASK;
}
}
if (ai)
freeaddrinfo(ai);
return 0;
fail:
if (ai)
freeaddrinfo(ai);
return 1;
}
/*
* Parse out the next white space separated field
*/
void
nextfield(cp, endcp)
char **cp;
char **endcp;
{
char *p;
p = *cp;
while (*p == ' ' || *p == '\t')
p++;
if (*p == '\n' || *p == '\0')
*cp = *endcp = p;
else {
*cp = p++;
while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
p++;
*endcp = p;
}
}
/*
* Get an exports file line. Skip over blank lines and handle line
* continuations.
*/
int
get_line()
{
char *p, *cp;
size_t len;
int totlen, cont_line;
/*
* Loop around ignoring blank lines and getting all continuation lines.
*/
p = line;
totlen = 0;
do {
if ((p = fgetln(exp_file, &len)) == NULL)
return (0);
cp = p + len - 1;
cont_line = 0;
while (cp >= p &&
(*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
if (*cp == '\\')
cont_line = 1;
cp--;
len--;
}
if (cont_line) {
*++cp = ' ';
len++;
}
if (linesize < len + totlen + 1) {
linesize = len + totlen + 1;
line = realloc(line, linesize);
if (line == NULL)
out_of_mem();
}
memcpy(line + totlen, p, len);
totlen += len;
line[totlen] = '\0';
} while (totlen == 0 || cont_line);
return (1);
}
/*
* Parse a description of a credential.
*/
void
parsecred(namelist, cr)
char *namelist;
struct xucred *cr;
{
char *name;
int cnt;
char *names;
struct passwd *pw;
struct group *gr;
gid_t groups[NGROUPS + 1];
int ngroups;
cr->cr_version = XUCRED_VERSION;
/*
* Set up the unprivileged user.
*/
cr->cr_uid = -2;
cr->cr_groups[0] = -2;
cr->cr_ngroups = 1;
/*
* 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_groups[0] = groups[0];
for (cnt = 2; 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()
{
struct mountlist *mlp, **mlpp;
char *host, *dirp, *cp;
char str[STRSIZ];
FILE *mlfile;
if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
if (errno == ENOENT)
return;
else {
syslog(LOG_ERR, "can't open %s", _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 == (struct mountlist *)NULL)
out_of_mem();
strncpy(mlp->ml_host, host, RPCMNT_NAMELEN);
mlp->ml_host[RPCMNT_NAMELEN] = '\0';
strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
mlp->ml_next = (struct mountlist *)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", _PATH_RMOUNTLIST);
return;
}
mlp = mlhead;
while (mlp) {
fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
mlp = mlp->ml_next;
}
fclose(mlfile);
}
}
void
add_mlist(hostp, dirp)
char *hostp, *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 == (struct mountlist *)NULL)
out_of_mem();
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_next = (struct mountlist *)NULL;
*mlpp = mlp;
if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
return;
}
fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
fclose(mlfile);
}
/*
* Free up a group list.
*/
void
free_grp(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((caddr_t)grp);
}
#ifdef DEBUG
void
SYSLOG(int pri, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
#endif /* DEBUG */
/*
* Check options for consistency.
*/
int
check_options(dp)
struct dirlist *dp;
{
if (dp == (struct dirlist *)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_NET) && (opt_flags & OP_HAVEMASK) == 0) {
syslog(LOG_ERR, "-network requires mask specification");
return (1);
}
if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
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
*/
int
check_dirpath(dirp)
char *dirp;
{
char *cp;
int ret = 1;
struct stat sb;
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))
ret = 0;
return (ret);
}
/*
* Make a netmask according to the specified prefix length. The ss_family
* and other non-address fields must be initialised before calling this.
*/
int
makemask(struct sockaddr_storage *ssp, int bitlen)
{
u_char *p;
int bits, i, len;
if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
return (-1);
if (bitlen > len * CHAR_BIT)
return (-1);
for (i = 0; i < len; i++) {
bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen;
*p++ = (1 << bits) - 1;
bitlen -= bits;
}
return 0;
}
/*
* Check that the sockaddr is a valid netmask. Returns 0 if the mask
* is acceptable (i.e. of the form 1...10....0).
*/
int
checkmask(struct sockaddr *sa)
{
u_char *mask;
int i, len;
if ((mask = sa_rawaddr(sa, &len)) == NULL)
return (-1);
for (i = 0; i < len; i++)
if (mask[i] != 0xff)
break;
if (i < len) {
if (~mask[i] & (u_char)(~mask[i] + 1))
return (-1);
i++;
}
for (; i < len; i++)
if (mask[i] != 0)
return (-1);
return (0);
}
/*
* Compare two sockaddrs according to a specified mask. Return zero if
* `sa1' matches `sa2' when filtered by the netmask in `samask'.
* If samask is NULL, perform a full comparision.
*/
int
sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
{
unsigned char *p1, *p2, *mask;
int len, i;
if (sa1->sa_family != sa2->sa_family ||
(p1 = sa_rawaddr(sa1, &len)) == NULL ||
(p2 = sa_rawaddr(sa2, NULL)) == NULL)
return (1);
switch (sa1->sa_family) {
case AF_INET6:
if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
((struct sockaddr_in6 *)sa2)->sin6_scope_id)
return (1);
break;
}
/* Simple binary comparison if no mask specified. */
if (samask == NULL)
return (memcmp(p1, p2, len));
/* Set up the mask, and do a mask-based comparison. */
if (sa1->sa_family != samask->sa_family ||
(mask = sa_rawaddr(samask, NULL)) == NULL)
return (1);
for (i = 0; i < len; i++)
if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
return (1);
return (0);
}
/*
* Return a pointer to the part of the sockaddr that contains the
* raw address, and set *nbytes to its length in bytes. Returns
* NULL if the address family is unknown.
*/
void *
sa_rawaddr(struct sockaddr *sa, int *nbytes) {
void *p;
int len;
switch (sa->sa_family) {
case AF_INET:
len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
p = &((struct sockaddr_in *)sa)->sin_addr;
break;
case AF_INET6:
len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
p = &((struct sockaddr_in6 *)sa)->sin6_addr;
break;
default:
p = NULL;
len = 0;
}
if (nbytes != NULL)
*nbytes = len;
return (p);
}
void
huphandler(int sig)
{
got_sighup = 1;
}
void terminate(sig)
int sig;
{
pidfile_remove(pfh);
rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
exit (0);
}
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