nfs4cbd.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley 4.3 BSD
* under license from the Regents of the University of California.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* This module provides the user level support for the NFSv4
* callback program. It is modeled after nfsd. When a nfsv4
* mount occurs, the mount command forks and the child runs
* start_nfs4_callback. If this is the first mount, then the
* process will hang around listening for incoming connection
* requests from the nfsv4 server.
*
* For connection-less protocols, the krpc is started immediately.
* For connection oriented protocols, the kernel module is informed
* of netid and universal address that it can give this
* information to the server during setclientid.
*/
#include <sys/param.h>
#include <sys/types.h>
#include <syslog.h>
#include <tiuser.h>
#include <rpc/rpc.h>
#include <errno.h>
#include <thread.h>
#include <sys/resource.h>
#include <sys/file.h>
#include <nfs/nfs.h>
#include <nfs/nfssys.h>
#include <stdio.h>
#include <stdlib.h>
#include <netconfig.h>
#include <netdir.h>
#include <string.h>
#include <unistd.h>
#include <stropts.h>
#include <sys/tihdr.h>
#include <netinet/tcp.h>
#include "nfs_tbind.h"
#include "thrpool.h"
#include <rpcsvc/nfs4_prot.h>
#include <netdb.h>
#include <signal.h>
#include <strings.h>
#include <priv_utils.h>
#include <rpcsvc/daemon_utils.h>
static int nfs4svc(int, struct netbuf *, struct netconfig *, int,
struct netbuf *);
extern int _nfssys(int, void *);
static char *MyName;
/*
* The following are all globals used by routines in nfs_tbind.c.
*/
size_t end_listen_fds; /* used by conn_close_oldest() */
size_t num_fds = 0; /* used by multiple routines */
int listen_backlog = 32; /* used by bind_to_{provider,proto}() */
int num_servers; /* used by cots_listen_event() */
int (*Mysvc)(int, struct netbuf, struct netconfig *) = NULL;
/* used by cots_listen_event() */
int max_conns_allowed = -1; /* used by cots_listen_event() */
main(int argc, char **argv)
{
int pid;
int i;
struct protob *protobp;
struct flock f;
pid_t pi;
struct svcpool_args cb_svcpool;
MyName = "nfs4cbd";
Mysvc4 = nfs4svc;
#ifndef DEBUG
/*
* Close existing file descriptors, open "/dev/null" as
* standard input, output, and error, and detach from
* controlling terminal.
*/
closefrom(0);
(void) open("/dev/null", O_RDONLY);
(void) open("/dev/null", O_WRONLY);
(void) dup(1);
(void) setsid();
#endif
/*
* create a child to continue our work
* Parent's exit will tell mount command we're ready to go
*/
if ((pi = fork()) > 0) {
exit(0);
}
if (pi == -1) {
(void) syslog(LOG_ERR,
"Could not start NFS4_CALLBACK service");
exit(1);
}
(void) _create_daemon_lock(NFS4CBD, DAEMON_UID, DAEMON_GID);
svcsetprio();
if (__init_daemon_priv(PU_RESETGROUPS|PU_CLEARLIMITSET,
DAEMON_UID, DAEMON_GID, PRIV_SYS_NFS, (char *)NULL) == -1) {
(void) fprintf(stderr, "%s must be run with sufficient"
" privileges\n", argv[0]);
exit(1);
}
/* Basic privileges we don't need, remove from E/P. */
__fini_daemon_priv(PRIV_PROC_EXEC, PRIV_PROC_FORK, PRIV_FILE_LINK_ANY,
PRIV_PROC_SESSION, PRIV_PROC_INFO, (char *)NULL);
/*
* establish our lock on the lock file and write our pid to it.
* exit if some other process holds the lock, or if there's any
* error in writing/locking the file.
*/
pid = _enter_daemon_lock(NFS4CBD);
switch (pid) {
case 0:
break;
case -1:
syslog(LOG_ERR, "error locking for %s: %s", NFS4CBD,
strerror(errno));
exit(2);
default:
/* daemon was already running */
exit(0);
}
openlog(MyName, LOG_PID | LOG_NDELAY, LOG_DAEMON);
cb_svcpool.id = NFS_CB_SVCPOOL_ID;
cb_svcpool.maxthreads = 0;
cb_svcpool.redline = 0;
cb_svcpool.qsize = 0;
cb_svcpool.timeout = 0;
cb_svcpool.stksize = 0;
cb_svcpool.max_same_xprt = 0;
/* create a SVC_POOL for the nfsv4 callback deamon */
if (_nfssys(SVCPOOL_CREATE, &cb_svcpool)) {
(void) syslog(LOG_ERR, "can't setup NFS_CB SVCPOOL: Exiting");
exit(1);
}
/*
* Set up blocked thread to do LWP creation on behalf of the kernel.
*/
if (svcwait(NFS_CB_SVCPOOL_ID)) {
(void) syslog(LOG_ERR,
"Can't set up NFS_CB LWP creator: Exiting");
exit(1);
}
/*
* Build a protocol block list for registration.
*/
protobp = (struct protob *)malloc(sizeof (struct protob));
protobp->serv = "NFS4_CALLBACK";
protobp->versmin = NFS_CB;
protobp->versmax = NFS_CB;
protobp->program = NFS4_CALLBACK;
protobp->next = NULL;
if (do_all(protobp, NULL) == -1) {
exit(1);
}
free(protobp);
if (num_fds == 0) {
(void) syslog(LOG_ERR,
"Could not start NFS4_CALLBACK service for any protocol");
exit(1);
}
end_listen_fds = num_fds;
/*
* Poll for non-data control events on the transport descriptors.
*/
poll_for_action();
/*
* If we get here, something failed in poll_for_action().
*/
return (1);
}
char *
get_uaddr(int fd, struct netconfig *nconf, struct netbuf *nb)
{
struct nfs_svc_args nsa;
char *ua, *ua2, *mua = NULL;
char me[MAXHOSTNAMELEN];
struct nd_addrlist *nas;
struct nd_hostserv hs;
struct nd_mergearg ma;
ua = taddr2uaddr(nconf, nb);
if (ua == NULL) {
#ifdef DEBUG
fprintf(stderr, "taddr2uaddr failed for netid %s\n",
nconf->nc_netid);
#endif
return (NULL);
}
gethostname(me, MAXHOSTNAMELEN);
hs.h_host = me;
hs.h_serv = "nfs";
if (netdir_getbyname(nconf, &hs, &nas)) {
#ifdef DEBUG
netdir_perror("netdir_getbyname");
#endif
return (NULL);
}
ua2 = taddr2uaddr(nconf, nas->n_addrs);
if (ua2 == NULL) {
#ifdef DEBUG
fprintf(stderr, "taddr2uaddr failed for netid %s.\n",
nconf->nc_netid);
#endif
return (NULL);
}
ma.s_uaddr = ua;
ma.c_uaddr = ua2;
ma.m_uaddr = NULL;
if (netdir_options(nconf, ND_MERGEADDR, 0, (char *)&ma)) {
#ifdef DEBUG
netdir_perror("netdir_options");
#endif
return (NULL);
}
mua = ma.m_uaddr;
return (mua);
}
/*
* Establish NFS4 callback service thread.
*/
static int
nfs4svc(int fd, struct netbuf *addrmask, struct netconfig *nconf,
int cmd, struct netbuf *addr)
{
struct nfs4_svc_args nsa;
char *ua;
int error;
ua = get_uaddr(fd, nconf, addr);
if (ua == NULL) {
syslog(LOG_NOTICE, "nfsv4 cannot determine local hostname "
"binding for transport %s - delegations will not be "
"available on this transport\n", nconf->nc_netid);
return (0);
}
#ifdef DEBUG
if (cmd & NFS4_KRPC_START)
fprintf(stderr, "nfs4cbd: starting callback rpc on %s %s\n",
nconf->nc_netid, ua);
else
fprintf(stderr, "nfs4cbd: listening on %s %s\n",
nconf->nc_netid, ua);
#endif
nsa.fd = fd;
nsa.cmd = cmd;
nsa.netid = nconf->nc_netid;
if (addrmask)
nsa.addrmask = *addrmask;
else
bzero(&nsa.addrmask, sizeof (struct netbuf));
nsa.addr = ua;
nsa.protofmly = nconf->nc_protofmly;
nsa.proto = nconf->nc_proto;
if ((error = _nfssys(NFS4_SVC, &nsa)) != 0)
syslog(LOG_ERR, "nfssys NFS4_SVC failed\n");
return (error);
}