OpenBSD-4.6/sbin/nfsd/nfsd.c
/* $OpenBSD: nfsd.c,v 1.28 2008/03/13 16:16:42 thib Exp $ */
/* $NetBSD: nfsd.c,v 1.19 1996/02/18 23:18:56 mycroft Exp $ */
/*
* Copyright (c) 1989, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1989, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static const char sccsid[] = "@(#)nfsd.c 8.9 (Berkeley) 3/29/95";
#else
static const char rcsid[] = "$OpenBSD: nfsd.c,v 1.28 2008/03/13 16:16:42 thib Exp $";
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/uio.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
/* Global defs */
#ifdef DEBUG
#define syslog(e, s) fprintf(stderr,(s))
int debug = 1;
#else
int debug = 0;
#endif
struct nfsd_srvargs nsd;
void nonfs(int);
void reapchild(int);
void usage(void);
#define MAXNFSDCNT 20
#define DEFNFSDCNT 4
/*
* Nfs server daemon mostly just a user context for nfssvc()
*
* 1 - do file descriptor and signal cleanup
* 2 - fork the nfsd(s)
* 3 - create server socket(s)
* 4 - register socket with portmap
*
* For connectionless protocols, just pass the socket into the kernel via.
* nfssvc().
* For connection based sockets, loop doing accepts. When you get a new
* socket from accept, pass the msgsock into the kernel via. nfssvc().
* The arguments are:
* -r - reregister with portmapper
* -t - support tcp nfs clients
* -u - support udp nfs clients
* followed by "n" which is the number of nfsds' to fork off
*/
int
main(int argc, char *argv[])
{
struct nfsd_args nfsdargs;
struct sockaddr_in inetaddr, inetpeer;
fd_set *ready, *sockbits;
size_t fd_size;
int ch, connect_type_cnt, i, maxsock = 0, msgsock;
int nfsdcnt = DEFNFSDCNT, on, reregister = 0, sock;
int udpflag = 0, tcpflag = 0, tcpsock;
const char *errstr = NULL;
socklen_t len;
if (argc == 1)
udpflag = 1;
while ((ch = getopt(argc, argv, "n:rtu")) != -1)
switch (ch) {
case 'n':
nfsdcnt = strtonum(optarg, 1, MAXNFSDCNT, &errstr);
if (errstr) {
warnx("nfsd count %s %s; reset to %d",
optarg, errstr, DEFNFSDCNT);
nfsdcnt = DEFNFSDCNT;
}
break;
case 'r':
reregister = 1;
break;
case 't':
tcpflag = 1;
break;
case 'u':
udpflag = 1;
break;
default:
usage();
};
argv += optind;
argc -= optind;
/*
* XXX
* Backward compatibility, trailing number is the count of daemons.
*/
if (argc > 1)
usage();
if (argc == 1) {
nfsdcnt = strtonum(argv[0], 1, MAXNFSDCNT, &errstr);
if (errstr) {
warnx("nfsd count %s %s; reset to %d",
argv[0], errstr, DEFNFSDCNT);
nfsdcnt = DEFNFSDCNT;
}
}
if (debug == 0) {
daemon(0, 0);
(void)signal(SIGHUP, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
(void)signal(SIGSYS, nonfs);
}
(void)signal(SIGCHLD, reapchild);
if (reregister) {
if (udpflag &&
(!pmap_set(RPCPROG_NFS, 2, IPPROTO_UDP, NFS_PORT) ||
!pmap_set(RPCPROG_NFS, 3, IPPROTO_UDP, NFS_PORT)))
err(1, "can't register with portmap for UDP.");
if (tcpflag &&
(!pmap_set(RPCPROG_NFS, 2, IPPROTO_TCP, NFS_PORT) ||
!pmap_set(RPCPROG_NFS, 3, IPPROTO_TCP, NFS_PORT)))
err(1, "can't register with portmap for TCP.");
return (0);
}
openlog("nfsd", LOG_PID, LOG_DAEMON);
for (i = 0; i < nfsdcnt; i++) {
switch (fork()) {
case -1:
syslog(LOG_ERR, "fork: %m");
return (1);
case 0:
break;
default:
continue;
}
setproctitle("server");
nsd.nsd_nfsd = NULL;
if (nfssvc(NFSSVC_NFSD, &nsd) < 0) {
syslog(LOG_ERR, "nfssvc: %m");
return (1);
}
return (0);
}
/* If we are serving udp, set up the socket. */
if (udpflag) {
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
syslog(LOG_ERR, "can't create udp socket");
return (1);
}
memset(&inetaddr, 0, sizeof inetaddr);
inetaddr.sin_family = AF_INET;
inetaddr.sin_addr.s_addr = INADDR_ANY;
inetaddr.sin_port = htons(NFS_PORT);
inetaddr.sin_len = sizeof(inetaddr);
if (bind(sock, (struct sockaddr *)&inetaddr,
sizeof(inetaddr)) < 0) {
syslog(LOG_ERR, "can't bind udp addr");
return (1);
}
if (!pmap_set(RPCPROG_NFS, 2, IPPROTO_UDP, NFS_PORT) ||
!pmap_set(RPCPROG_NFS, 3, IPPROTO_UDP, NFS_PORT)) {
syslog(LOG_ERR, "can't register with udp portmap");
return (1);
}
nfsdargs.sock = sock;
nfsdargs.name = NULL;
nfsdargs.namelen = 0;
if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) {
syslog(LOG_ERR, "can't Add UDP socket");
return (1);
}
(void)close(sock);
}
/* Now set up the master server socket waiting for tcp connections. */
on = 1;
connect_type_cnt = 0;
if (tcpflag) {
if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
syslog(LOG_ERR, "can't create tcp socket");
return (1);
}
if (setsockopt(tcpsock,
SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m");
memset(&inetaddr, 0, sizeof inetaddr);
inetaddr.sin_family = AF_INET;
inetaddr.sin_addr.s_addr = INADDR_ANY;
inetaddr.sin_port = htons(NFS_PORT);
inetaddr.sin_len = sizeof(inetaddr);
if (bind(tcpsock, (struct sockaddr *)&inetaddr,
sizeof (inetaddr)) < 0) {
syslog(LOG_ERR, "can't bind tcp addr");
return (1);
}
if (listen(tcpsock, 5) < 0) {
syslog(LOG_ERR, "listen failed");
return (1);
}
if (!pmap_set(RPCPROG_NFS, 2, IPPROTO_TCP, NFS_PORT) ||
!pmap_set(RPCPROG_NFS, 3, IPPROTO_TCP, NFS_PORT)) {
syslog(LOG_ERR, "can't register tcp with portmap");
return (1);
}
maxsock = tcpsock;
connect_type_cnt++;
}
if (connect_type_cnt == 0)
return (0);
setproctitle("master");
/*
* Allocate space for the fd_set pointers and fill in sockbits
*/
fd_size = howmany(maxsock + 1, NFDBITS) * sizeof(fd_mask);
sockbits = malloc(fd_size);
ready = malloc(fd_size);
if (sockbits == NULL || ready == NULL) {
syslog(LOG_ERR, "cannot allocate memory");
return (1);
}
memset(sockbits, 0, fd_size);
if (tcpflag)
FD_SET(tcpsock, sockbits);
/*
* Loop forever accepting connections and passing the sockets
* into the kernel for the mounts.
*/
for (;;) {
memcpy(ready, sockbits, fd_size);
if (connect_type_cnt > 1) {
if (select(maxsock + 1,
ready, NULL, NULL, NULL) < 1) {
syslog(LOG_ERR, "select failed: %m");
return (1);
}
}
if (tcpflag && FD_ISSET(tcpsock, ready)) {
len = sizeof(inetpeer);
if ((msgsock = accept(tcpsock,
(struct sockaddr *)&inetpeer, &len)) < 0) {
syslog(LOG_ERR, "accept failed: %m");
return (1);
}
memset(inetpeer.sin_zero, 0, sizeof(inetpeer.sin_zero));
if (setsockopt(msgsock, SOL_SOCKET,
SO_KEEPALIVE, &on, sizeof(on)) < 0)
syslog(LOG_ERR,
"setsockopt SO_KEEPALIVE: %m");
nfsdargs.sock = msgsock;
nfsdargs.name = (caddr_t)&inetpeer;
nfsdargs.namelen = sizeof(inetpeer);
if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) {
syslog(LOG_ERR, "can't Add TCP socket");
return (1);
}
(void)close(msgsock);
}
}
}
void
usage(void)
{
(void)fprintf(stderr, "usage: nfsd [-rtu] [-n num_servers]\n");
exit(1);
}
/* ARGSUSED */
void
nonfs(int signo)
{
int save_errno = errno;
struct syslog_data sdata = SYSLOG_DATA_INIT;
syslog_r(LOG_ERR, &sdata, "missing system call: NFS not available.");
errno = save_errno;
}
/* ARGSUSED */
void
reapchild(int signo)
{
int save_errno = errno;
while (wait3(NULL, WNOHANG, NULL) > 0)
;
errno = save_errno;
}