1 files changed, 887 insertions, 0 deletions

diff --git a/utils/mountd/mountd.c b/utils/mountd/mountd.c
new file mode 100644
index 0000000..dbd5546
--- /dev/null
+++ b/utils/mountd/mountd.c
@@ -0,0 +1,887 @@
+/*
+ * utils/mountd/mountd.c
+ *
+ * Authenticate mount requests and retrieve file handle.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <signal.h>
+#include <sys/stat.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/resource.h>
+
+#include "conffile.h"
+#include "xmalloc.h"
+#include "misc.h"
+#include "mountd.h"
+#include "rpcmisc.h"
+#include "pseudoflavors.h"
+#include "nfsd_path.h"
+#include "nfslib.h"
+#include "export.h"
+
+extern void my_svc_run(void);
+
+static void		usage(const char *, int exitcode);
+static exports		get_exportlist(void);
+static struct nfs_fh_len *get_rootfh(struct svc_req *, dirpath *, nfs_export **, mountstat3 *, int v3);
+
+int reverse_resolve = 0;
+int manage_gids;
+int use_ipaddr = -1;
+
+/* PRC: a high-availability callout program can be specified with -H
+ * When this is done, the program will receive callouts whenever clients
+ * send mount or unmount requests -- the callout is not needed for 2.6 kernel */
+char *ha_callout_prog = NULL;
+
+/* Number of mountd threads to start.   Default is 1 and
+ * that's probably enough unless you need hundreds of
+ * clients to be able to mount at once.  */
+static int num_threads = 1;
+/* Arbitrary limit on number of threads */
+#define MAX_THREADS 64
+
+static struct option longopts[] =
+{
+	{ "foreground", 0, 0, 'F' },
+	{ "descriptors", 1, 0, 'o' },
+	{ "debug", 1, 0, 'd' },
+	{ "help", 0, 0, 'h' },
+	{ "nfs-version", 1, 0, 'V' },
+	{ "no-nfs-version", 1, 0, 'N' },
+	{ "version", 0, 0, 'v' },
+	{ "port", 1, 0, 'p' },
+	{ "no-tcp", 0, 0, 'n' },
+	{ "ha-callout", 1, 0, 'H' },
+	{ "state-directory-path", 1, 0, 's' },
+	{ "num-threads", 1, 0, 't' },
+	{ "reverse-lookup", 0, 0, 'r' },
+	{ "manage-gids", 0, 0, 'g' },
+	{ "no-udp", 0, 0, 'u' },
+	{ "log-auth", 0, 0, 'l'},
+	{ "cache-use-ipaddr", 0, 0, 'i'},
+	{ "ttl", 1, 0, 'T'},
+	{ NULL, 0, 0, 0 }
+};
+static char shortopts[] = "o:nFd:p:P:hH:N:V:vurs:t:gliT:";
+
+#define NFSVERSBIT(vers)	(0x1 << (vers - 1))
+#define NFSVERSBIT_ALL		(NFSVERSBIT(2) | NFSVERSBIT(3) | NFSVERSBIT(4))
+
+static int nfs_version = NFSVERSBIT_ALL;
+
+static int version2(void)
+{
+	return nfs_version & NFSVERSBIT(2);
+}
+
+static int version3(void)
+{
+	return nfs_version & NFSVERSBIT(3);
+}
+
+static int version23(void)
+{
+	return nfs_version & (NFSVERSBIT(2) | NFSVERSBIT(3));
+}
+
+static int version_any(void)
+{
+	return nfs_version & NFSVERSBIT_ALL;
+}
+
+static void
+unregister_services (void)
+{
+	nfs_svc_unregister(MOUNTPROG, MOUNTVERS);
+	nfs_svc_unregister(MOUNTPROG, MOUNTVERS_POSIX);
+	nfs_svc_unregister(MOUNTPROG, MOUNTVERS_NFSV3);
+}
+
+static void
+cleanup_lockfiles (void)
+{
+	unlink(etab.lockfn);
+	unlink(rmtab.lockfn);
+}
+
+/*
+ * Signal handler.
+ */
+static void
+killer (int sig)
+{
+	unregister_services();
+	if (num_threads > 1) {
+		/* play Kronos and eat our children */
+		kill(0, SIGTERM);
+		cache_wait_for_workers("mountd");
+	}
+	cleanup_lockfiles();
+	free_state_path_names(&etab);
+	free_state_path_names(&rmtab);
+	xlog (L_NOTICE, "Caught signal %d, un-registering and exiting.", sig);
+	exit(0);
+}
+
+static void
+sig_hup (int UNUSED(sig))
+{
+	/* don't exit on SIGHUP */
+	xlog (L_NOTICE, "Received SIGHUP... Ignoring.\n");
+	return;
+}
+
+bool_t
+mount_null_1_svc(struct svc_req *rqstp, void *UNUSED(argp),
+	void *UNUSED(resp))
+{
+	struct sockaddr *sap = nfs_getrpccaller(rqstp->rq_xprt);
+	char buf[INET6_ADDRSTRLEN];
+
+	xlog(D_CALL, "Received NULL request from %s",
+		host_ntop(sap, buf, sizeof(buf)));
+
+	return 1;
+}
+
+bool_t
+mount_mnt_1_svc(struct svc_req *rqstp, dirpath *path, fhstatus *res)
+{
+	struct sockaddr *sap = nfs_getrpccaller(rqstp->rq_xprt);
+	char buf[INET6_ADDRSTRLEN];
+	struct nfs_fh_len *fh;
+
+	xlog(D_CALL, "Received MNT1(%s) request from %s", *path,
+		host_ntop(sap, buf, sizeof(buf)));
+
+	fh = get_rootfh(rqstp, path, NULL, &res->fhs_status, 0);
+	if (fh)
+		memcpy(&res->fhstatus_u.fhs_fhandle, fh->fh_handle, 32);
+	return 1;
+}
+
+bool_t
+mount_dump_1_svc(struct svc_req *rqstp, void *UNUSED(argp), mountlist *res)
+{
+	struct sockaddr *sap = nfs_getrpccaller(rqstp->rq_xprt);
+	char buf[INET6_ADDRSTRLEN];
+
+	xlog(D_CALL, "Received DUMP request from %s",
+		host_ntop(sap, buf, sizeof(buf)));
+
+	*res = mountlist_list();
+
+	return 1;
+}
+
+bool_t
+mount_umnt_1_svc(struct svc_req *rqstp, dirpath *argp, void *UNUSED(resp))
+{
+	struct sockaddr *sap = nfs_getrpccaller(rqstp->rq_xprt);
+	nfs_export	*exp;
+	char		*p = *argp;
+	char		rpath[MAXPATHLEN+1];
+	char		buf[INET6_ADDRSTRLEN];
+
+	if (*p == '\0')
+		p = "/";
+
+	if (nfsd_realpath(p, rpath) != NULL) {
+		rpath[sizeof (rpath) - 1] = '\0';
+		p = rpath;
+	}
+
+	xlog(D_CALL, "Received UMNT(%s) request from %s", p,
+		host_ntop(sap, buf, sizeof(buf)));
+
+	exp = auth_authenticate("unmount", sap, p);
+	if (exp == NULL)
+		return 1;
+
+	mountlist_del(host_ntop(sap, buf, sizeof(buf)), p);
+	return 1;
+}
+
+bool_t
+mount_umntall_1_svc(struct svc_req *rqstp, void *UNUSED(argp), 
+	void *UNUSED(resp))
+{
+	struct sockaddr *sap = nfs_getrpccaller(rqstp->rq_xprt);
+	char		buf[INET6_ADDRSTRLEN];
+
+	xlog(D_CALL, "Received UMNTALL request from %s",
+		host_ntop(sap, buf, sizeof(buf)));
+
+	/* Reload /etc/exports if necessary */
+	auth_reload();
+
+	mountlist_del_all(nfs_getrpccaller(rqstp->rq_xprt));
+	return 1;
+}
+
+bool_t
+mount_export_1_svc(struct svc_req *rqstp, void *UNUSED(argp), exports *resp)
+{
+	struct sockaddr *sap = nfs_getrpccaller(rqstp->rq_xprt);
+	char buf[INET6_ADDRSTRLEN];
+
+	xlog(D_CALL, "Received EXPORT request from %s.",
+		host_ntop(sap, buf, sizeof(buf)));
+
+	*resp = get_exportlist();
+		
+	return 1;
+}
+
+bool_t
+mount_exportall_1_svc(struct svc_req *rqstp, void *UNUSED(argp), exports *resp)
+{
+	struct sockaddr *sap = nfs_getrpccaller(rqstp->rq_xprt);
+	char buf[INET6_ADDRSTRLEN];
+
+	xlog(D_CALL, "Received EXPORTALL request from %s.",
+		host_ntop(sap, buf, sizeof(buf)));
+
+	*resp = get_exportlist();
+
+	return 1;
+}
+
+/*
+ * MNTv2 pathconf procedure
+ *
+ * The protocol doesn't include a status field, so Sun apparently considers
+ * it good practice to let anyone snoop on your system, even if it's
+ * pretty harmless data such as pathconf. We don't.
+ *
+ * Besides, many of the pathconf values don't make much sense on NFS volumes.
+ * FIFOs and tty device files represent devices on the *client*, so there's
+ * no point in getting the server's buffer sizes etc.
+ */
+bool_t
+mount_pathconf_2_svc(struct svc_req *rqstp, dirpath *path, ppathcnf *res)
+{
+	struct sockaddr *sap = nfs_getrpccaller(rqstp->rq_xprt);
+	struct stat	stb;
+	nfs_export	*exp;
+	char		rpath[MAXPATHLEN+1];
+	char		*p = *path;
+	char buf[INET6_ADDRSTRLEN];
+
+	memset(res, 0, sizeof(*res));
+
+	if (*p == '\0')
+		p = "/";
+
+	/* Reload /etc/exports if necessary */
+	auth_reload();
+
+	/* Resolve symlinks */
+	if (nfsd_realpath(p, rpath) != NULL) {
+		rpath[sizeof (rpath) - 1] = '\0';
+		p = rpath;
+	}
+
+	xlog(D_CALL, "Received PATHCONF(%s) request from %s", p,
+		host_ntop(sap, buf, sizeof(buf)));
+
+	/* Now authenticate the intruder... */
+	exp = auth_authenticate("pathconf", sap, p);
+	if (exp == NULL)
+		return 1;
+	else if (nfsd_path_stat(p, &stb) < 0) {
+		xlog(L_WARNING, "can't stat exported dir %s: %s",
+				p, strerror(errno));
+		return 1;
+	}
+
+	res->pc_link_max  = pathconf(p, _PC_LINK_MAX);
+	res->pc_max_canon = pathconf(p, _PC_MAX_CANON);
+	res->pc_max_input = pathconf(p, _PC_MAX_INPUT);
+	res->pc_name_max  = pathconf(p, _PC_NAME_MAX);
+	res->pc_path_max  = pathconf(p, _PC_PATH_MAX);
+	res->pc_pipe_buf  = pathconf(p, _PC_PIPE_BUF);
+	res->pc_vdisable  = pathconf(p, _PC_VDISABLE);
+
+	/* Can't figure out what to do with pc_mask */
+	res->pc_mask[0]   = 0;
+	res->pc_mask[1]   = 0;
+
+	return 1;
+}
+
+/*
+ * We should advertise the preferred flavours first. (See RFC 2623
+ * section 2.7.)  We leave that to the administrator, by advertising
+ * flavours in the order they were listed in /etc/exports.  AUTH_NULL is
+ * dropped from the list to avoid backward compatibility issue with
+ * older Linux clients, who inspect the list in reversed order.
+ *
+ * XXX: It might be more helpful to rearrange these so that flavors
+ * giving more access (as determined from readonly and id-squashing
+ * options) come first.  (If we decide to do that we should probably do
+ * that when reading the exports rather than here.)
+ */
+static void set_authflavors(struct mountres3_ok *ok, nfs_export *exp)
+{
+	struct sec_entry *s;
+	static int flavors[SECFLAVOR_COUNT];
+	int i = 0;
+
+	for (s = exp->m_export.e_secinfo; s->flav; s++) {
+		if (s->flav->fnum == AUTH_NULL)
+			continue;
+		flavors[i] = s->flav->fnum;
+		i++;
+	}
+	if (i == 0) {
+		/* default when there is no sec= option: */
+		i = 1;
+		flavors[0] = AUTH_UNIX;
+	}
+	ok->auth_flavors.auth_flavors_val = flavors;
+	ok->auth_flavors.auth_flavors_len = i;
+}
+
+/*
+ * NFSv3 MOUNT procedure
+ */
+bool_t
+mount_mnt_3_svc(struct svc_req *rqstp, dirpath *path, mountres3 *res)
+{
+	struct sockaddr *sap = nfs_getrpccaller(rqstp->rq_xprt);
+	struct mountres3_ok *ok = &res->mountres3_u.mountinfo;
+	char buf[INET6_ADDRSTRLEN];
+	nfs_export *exp;
+	struct nfs_fh_len *fh;
+
+	xlog(D_CALL, "Received MNT3(%s) request from %s", *path,
+		host_ntop(sap, buf, sizeof(buf)));
+
+	fh = get_rootfh(rqstp, path, &exp, &res->fhs_status, 1);
+	if (!fh)
+		return 1;
+
+	ok->fhandle.fhandle3_len = fh->fh_size;
+	ok->fhandle.fhandle3_val = (char *)fh->fh_handle;
+	set_authflavors(ok, exp);
+	return 1;
+}
+
+static struct nfs_fh_len *
+get_rootfh(struct svc_req *rqstp, dirpath *path, nfs_export **expret,
+		mountstat3 *error, int v3)
+{
+	struct sockaddr *sap = nfs_getrpccaller(rqstp->rq_xprt);
+	struct stat	stb, estb;
+	nfs_export	*exp;
+	struct nfs_fh_len *fh;
+	char		rpath[MAXPATHLEN+1];
+	char		*p = *path;
+	char		buf[INET6_ADDRSTRLEN];
+
+	if (*p == '\0')
+		p = "/";
+
+	/* Reload /var/lib/nfs/etab if necessary */
+	auth_reload();
+
+	/* Resolve symlinks */
+	if (nfsd_realpath(p, rpath) != NULL) {
+		rpath[sizeof (rpath) - 1] = '\0';
+		p = rpath;
+	}
+
+	/* Now authenticate the intruder... */
+	exp = auth_authenticate("mount", sap, p);
+	if (exp == NULL) {
+		*error = MNT3ERR_ACCES;
+		return NULL;
+	}
+	if (nfsd_path_stat(p, &stb) < 0) {
+		xlog(L_WARNING, "can't stat exported dir %s: %s",
+				p, strerror(errno));
+		if (errno == ENOENT)
+			*error = MNT3ERR_NOENT;
+		else
+			*error = MNT3ERR_ACCES;
+		return NULL;
+	}
+	if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
+		xlog(L_WARNING, "%s is not a directory or regular file", p);
+		*error = MNT3ERR_NOTDIR;
+		return NULL;
+	}
+	if (nfsd_path_stat(exp->m_export.e_path, &estb) < 0) {
+		xlog(L_WARNING, "can't stat export point %s: %s",
+		     p, strerror(errno));
+		*error = MNT3ERR_NOENT;
+		return NULL;
+	}
+	if (estb.st_dev != stb.st_dev
+	    && !(exp->m_export.e_flags & NFSEXP_CROSSMOUNT)) {
+		xlog(L_WARNING, "request to export directory %s below nearest filesystem %s",
+		     p, exp->m_export.e_path);
+		*error = MNT3ERR_ACCES;
+		return NULL;
+	}
+	if (exp->m_export.e_mountpoint &&
+		   !check_is_mountpoint(exp->m_export.e_mountpoint[0]?
+				  exp->m_export.e_mountpoint:
+				  exp->m_export.e_path,
+				  nfsd_path_lstat)) {
+		xlog(L_WARNING, "request to export an unmounted filesystem: %s",
+		     p);
+		*error = MNT3ERR_NOENT;
+		return NULL;
+	}
+
+	/* This will be a static private nfs_export with just one
+	 * address.  We feed it to kernel then extract the filehandle,
+	 */
+
+	if (cache_export(exp, p)) {
+		*error = MNT3ERR_ACCES;
+		return NULL;
+	}
+	fh = cache_get_filehandle(exp, v3?64:32, p);
+	if (fh == NULL) {
+		*error = MNT3ERR_ACCES;
+		return NULL;
+	}
+	*error = MNT_OK;
+	mountlist_add(host_ntop(sap, buf, sizeof(buf)), p);
+	if (expret)
+		*expret = exp;
+	return fh;
+}
+
+static void remove_all_clients(exportnode *e)
+{
+	struct groupnode *g, *ng;
+
+	for (g = e->ex_groups; g; g = ng) {
+		ng = g->gr_next;
+		xfree(g->gr_name);
+		xfree(g);
+	}
+	e->ex_groups = NULL;
+}
+
+static void free_exportlist(exports *elist)
+{
+	struct exportnode *e, *ne;
+
+	for (e = *elist; e != NULL; e = ne) {
+		ne = e->ex_next;
+		remove_all_clients(e);
+		xfree(e->ex_dir);
+		xfree(e);
+	}
+	*elist = NULL;
+}
+
+static void prune_clients(nfs_export *exp, struct exportnode *e)
+{
+	struct addrinfo *ai = NULL;
+	struct groupnode *c, **cp;
+
+	cp = &e->ex_groups;
+	while ((c = *cp) != NULL) {
+		if (client_gettype(c->gr_name) == MCL_FQDN
+		    && (ai = host_addrinfo(c->gr_name))) {
+			if (client_check(exp->m_client, ai)) {
+				*cp = c->gr_next;
+				xfree(c->gr_name);
+				xfree(c);
+				nfs_freeaddrinfo(ai);
+				continue;
+			}
+			nfs_freeaddrinfo(ai);
+		}
+		cp = &(c->gr_next);
+	}
+}
+
+static exportnode *lookup_or_create_elist_entry(exports *elist, nfs_export *exp)
+{
+	exportnode *e;
+
+	for (e = *elist; e != NULL; e = e->ex_next) {
+		if (!strcmp(exp->m_export.e_path, e->ex_dir))
+			return e;
+	}
+	e = xmalloc(sizeof(*e));
+	e->ex_next = *elist;
+	e->ex_groups = NULL;
+	e->ex_dir = xstrdup(exp->m_export.e_path);
+	*elist = e;
+	return e;
+}
+
+static void insert_group(struct exportnode *e, char *newname)
+{
+	struct groupnode *g;
+
+	for (g = e->ex_groups; g; g = g->gr_next)
+		if (!strcmp(g->gr_name, newname))
+			return;
+
+	g = xmalloc(sizeof(*g));
+	g->gr_name = xstrdup(newname);
+	g->gr_next = e->ex_groups;
+	e->ex_groups = g;
+}
+
+static exports
+get_exportlist(void)
+{
+	static exports		elist = NULL;
+	struct exportnode	*e;
+	nfs_export		*exp;
+	int			i;
+	static unsigned int	ecounter;
+	unsigned int		acounter;
+
+	acounter = auth_reload();
+	if (elist && acounter == ecounter)
+		return elist;
+
+	ecounter = acounter;
+
+	free_exportlist(&elist);
+
+	for (i = 0; i < MCL_MAXTYPES; i++) {
+		for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
+			 /* Don't show pseudo exports */
+			if (exp->m_export.e_flags & NFSEXP_V4ROOT)
+				continue;
+			e = lookup_or_create_elist_entry(&elist, exp);
+
+			/* exports to "*" absorb any others */
+			if (i == MCL_ANONYMOUS && e->ex_groups) {
+				remove_all_clients(e);
+				continue;
+			}
+			/* non-FQDN's absorb FQDN's they contain: */
+			if (i != MCL_FQDN && e->ex_groups)
+				prune_clients(exp, e);
+
+			if (exp->m_export.e_hostname[0] != '\0')
+				insert_group(e, exp->m_export.e_hostname);
+		}
+	}
+
+	return elist;
+}
+
+int	vers;
+int	port = 0;
+int	descriptors = 0;
+
+inline static void 
+read_mountd_conf(char **argv)
+{
+	char	*s;
+	int	ttl;
+
+	conf_init_file(NFS_CONFFILE);
+
+	xlog_set_debug("mountd");
+	manage_gids = conf_get_bool("mountd", "manage-gids", manage_gids);
+	descriptors = conf_get_num("mountd", "descriptors", descriptors);
+	port = conf_get_num("mountd", "port", port);
+	num_threads = conf_get_num("mountd", "threads", num_threads);
+	reverse_resolve = conf_get_bool("mountd", "reverse-lookup", reverse_resolve);
+	ha_callout_prog = conf_get_str("mountd", "ha-callout");
+	if (conf_get_bool("mountd", "cache-use-ipaddr", 0))
+		use_ipaddr = 2;
+
+	s = conf_get_str("mountd", "state-directory-path");
+	if (s && !state_setup_basedir(argv[0], s))
+		exit(1);
+
+	/* NOTE: following uses "nfsd" section of nfs.conf !!!! */
+	if (conf_get_bool("nfsd", "udp", NFSCTL_UDPISSET(_rpcprotobits)))
+		NFSCTL_UDPSET(_rpcprotobits);
+	else
+		NFSCTL_UDPUNSET(_rpcprotobits);
+	if (conf_get_bool("nfsd", "tcp", NFSCTL_TCPISSET(_rpcprotobits)))
+		NFSCTL_TCPSET(_rpcprotobits);
+	else
+		NFSCTL_TCPUNSET(_rpcprotobits);
+	for (vers = 2; vers <= 4; vers++) {
+		char tag[20];
+		sprintf(tag, "vers%d", vers);
+		if (conf_get_bool("nfsd", tag, NFSCTL_VERISSET(nfs_version, vers)))
+			NFSCTL_VERSET(nfs_version, vers);
+		else
+			NFSCTL_VERUNSET(nfs_version, vers);
+	}
+
+	ttl = conf_get_num("mountd", "ttl", default_ttl);
+	if (ttl > 0)
+		default_ttl = ttl;
+}
+
+int
+main(int argc, char **argv)
+{
+	char	*progname;
+	unsigned int listeners = 0;
+	int	foreground = 0;
+	int	c;
+	int	ttl;
+	struct sigaction sa;
+	struct rlimit rlim;
+
+	/* Set the basename */
+	if ((progname = strrchr(argv[0], '/')) != NULL)
+		progname++;
+	else
+		progname = argv[0];
+
+	/* Initialize logging. */
+	xlog_open(progname);
+
+	/* Read in config setting */
+	read_mountd_conf(argv);
+
+	/* Parse the command line options and arguments. */
+	opterr = 0;
+	while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != EOF)
+		switch (c) {
+		case 'g':
+			manage_gids = 1;
+			break;
+		case 'o':
+			descriptors = atoi(optarg);
+			if (descriptors <= 0) {
+				fprintf(stderr, "%s: bad descriptors: %s\n",
+					progname, optarg);
+				usage(progname, 1);
+			}
+			break;
+		case 'F':
+			foreground = 1;
+			break;
+		case 'd':
+			xlog_sconfig(optarg, 1);
+			break;
+		case 'H': /* PRC: specify a high-availability callout program */
+			ha_callout_prog = optarg;
+			break;
+		case 'h':
+			usage(progname, 0);
+			break;
+		case 'P':	/* XXX for nfs-server compatibility */
+		case 'p':
+			port = atoi(optarg);
+			if (port <= 0 || port > 65535) {
+				fprintf(stderr, "%s: bad port number: %s\n",
+					progname, optarg);
+				usage(progname, 1);
+			}
+			break;
+		case 'N':
+			vers = atoi(optarg);
+			if (vers < 2 || vers > 4) {
+				fprintf(stderr, "%s: bad version number: %s\n",
+					argv[0], optarg);
+				usage(argv[0], 1);
+			}
+			nfs_version &= ~NFSVERSBIT(vers);
+			break;
+		case 'n':
+			NFSCTL_TCPUNSET(_rpcprotobits);
+			break;
+		case 'r':
+			reverse_resolve = 1;
+			break;
+		case 's':
+			if (!state_setup_basedir(argv[0], optarg))
+				exit(1);
+			break;
+		case 't':
+			num_threads = atoi (optarg);
+			break;
+		case 'V':
+			vers = atoi(optarg);
+			if (vers < 2 || vers > 4) {
+				fprintf(stderr, "%s: bad version number: %s\n",
+					argv[0], optarg);
+				usage(argv[0], 1);
+			}
+			nfs_version |= NFSVERSBIT(vers);
+			break;
+		case 'v':
+			printf("%s version " VERSION "\n", progname);
+			exit(0);
+		case 'u':
+			NFSCTL_UDPUNSET(_rpcprotobits);
+			break;
+		case 'l':
+			xlog_sconfig("auth", 1);
+			break;
+		case 'i':
+			use_ipaddr = 2;
+			break;
+		case 'T':
+			ttl = atoi(optarg);
+			if (ttl <= 0) {
+				fprintf(stderr, "%s: bad ttl number of seconds: %s\n",
+					argv[0], optarg);
+				usage(argv[0], 1);
+			}
+			default_ttl = ttl;
+			break;
+		case 0:
+			break;
+		case '?':
+		default:
+			usage(progname, 1);
+		}
+
+	/* No more arguments allowed. */
+	if (optind != argc || !version_any()) {
+		fprintf(stderr, "%s: No protocol versions specified!\n", progname); 
+		usage(progname, 1);
+	}
+	if (!setup_state_path_names(progname, ETAB, ETABTMP, ETABLCK, &etab))
+		return 1;
+	if (!setup_state_path_names(progname, RMTAB, RMTABTMP, RMTABLCK, &rmtab))
+		return 1;
+
+	if (getrlimit (RLIMIT_NOFILE, &rlim) != 0)
+		fprintf(stderr, "%s: getrlimit (RLIMIT_NOFILE) failed: %s\n",
+				progname, strerror(errno));
+	else {
+		/* glibc sunrpc code dies if getdtablesize > FD_SETSIZE */
+		if ((descriptors == 0 && rlim.rlim_cur > FD_SETSIZE) ||
+		    descriptors > FD_SETSIZE)
+			descriptors = FD_SETSIZE;
+		if (descriptors) {
+			rlim.rlim_cur = descriptors;
+			if (setrlimit (RLIMIT_NOFILE, &rlim) != 0) {
+				fprintf(stderr, "%s: setrlimit (RLIMIT_NOFILE) failed: %s\n",
+					progname, strerror(errno));
+				exit(1);
+			}
+		}
+	}
+	if (!foreground) xlog_stderr(0);
+
+	sa.sa_handler = SIG_IGN;
+	sa.sa_flags = 0;
+	sigemptyset(&sa.sa_mask);
+	sigaction(SIGHUP, &sa, NULL);
+	sigaction(SIGINT, &sa, NULL);
+	sigaction(SIGTERM, &sa, NULL);
+	sigaction(SIGPIPE, &sa, NULL);
+	/* WARNING: the following works on Linux and SysV, but not BSD! */
+	sigaction(SIGCHLD, &sa, NULL);
+
+	unregister_services();
+	if (version2()) {
+		listeners += nfs_svc_create("mountd", MOUNTPROG,
+					MOUNTVERS, mount_dispatch, port);
+		listeners += nfs_svc_create("mountd", MOUNTPROG,
+					MOUNTVERS_POSIX, mount_dispatch, port);
+	}
+	if (version3())
+		listeners += nfs_svc_create("mountd", MOUNTPROG,
+					MOUNTVERS_NFSV3, mount_dispatch, port);
+	if (version23() && listeners == 0)
+		xlog(L_WARNING, "mountd: No V2 or V3 listeners created!");
+
+	sa.sa_handler = killer;
+	sigaction(SIGINT, &sa, NULL);
+	sigaction(SIGTERM, &sa, NULL);
+	sa.sa_handler = sig_hup;
+	sigaction(SIGHUP, &sa, NULL);
+
+	if (!foreground) {
+		/* We first fork off a child. */
+		if ((c = fork()) > 0)
+			exit(0);
+		if (c < 0) {
+			xlog(L_FATAL, "mountd: cannot fork: %s\n",
+						strerror(errno));
+		}
+		/* Now we remove ourselves from the foreground.
+		   Redirect stdin/stdout/stderr first. */
+		{
+			int fd = open("/dev/null", O_RDWR);
+			(void) dup2(fd, 0);
+			(void) dup2(fd, 1);
+			(void) dup2(fd, 2);
+			if (fd > 2) (void) close(fd);
+		}
+		setsid();
+	}
+
+	/* silently bounds check num_threads */
+	if (foreground)
+		num_threads = 1;
+	else if (num_threads < 1)
+		num_threads = 1;
+	else if (num_threads > MAX_THREADS)
+		num_threads = MAX_THREADS;
+
+	/* Open cache channel files BEFORE forking so each upcall is
+	 * only handled by one thread.  Kernel provides locking for both
+	 * read and write.
+	 */
+	cache_open();
+
+	if (cache_fork_workers("mountd", num_threads) == 0) {
+		/* We forked, waited, and now need to clean up */
+		unregister_services();
+		cleanup_lockfiles();
+		free_state_path_names(&etab);
+		free_state_path_names(&rmtab);
+		xlog(L_NOTICE, "mountd: no more workers, exiting\n");
+		exit(0);
+	}
+
+	nfsd_path_init();
+	v4clients_init();
+
+	xlog(L_NOTICE, "Version " VERSION " starting");
+	my_svc_run();
+
+	xlog(L_ERROR, "RPC service loop terminated unexpectedly. Exiting...\n");
+	unregister_services();
+	free_state_path_names(&etab);
+	free_state_path_names(&rmtab);
+	exit(1);
+}
+
+static void
+usage(const char *prog, int n)
+{
+	fprintf(stderr,
+"Usage: %s [-F|--foreground] [-h|--help] [-v|--version] [-d kind|--debug kind]\n"
+"	[-l|--log-auth] [-i|--cache-use-ipaddr] [-T|--ttl ttl]\n"
+"	[-o num|--descriptors num]\n"
+"	[-p|--port port] [-V version|--nfs-version version]\n"
+"	[-N version|--no-nfs-version version] [-n|--no-tcp]\n"
+"	[-H prog |--ha-callout prog] [-r |--reverse-lookup]\n"
+"	[-s|--state-directory-path path] [-g|--manage-gids]\n"
+"	[-t num|--num-threads=num] [-u|--no-udp]\n", prog);
+	exit(n);
+}