GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: sbin/nfsd/nfsd.c Lines: 0 152 0.0 %
Date: 2017-11-13 Branches: 0 91 0.0 %

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/*	$OpenBSD: nfsd.c,v 1.37 2017/08/31 06:50:56 mestre Exp $	*/
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/*	$NetBSD: nfsd.c,v 1.19 1996/02/18 23:18:56 mycroft Exp $	*/
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/*
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 * Copyright (c) 1989, 1993, 1994
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 *	The Regents of the University of California.  All rights reserved.
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 *
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 * This code is derived from software contributed to Berkeley by
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 * Rick Macklem at The University of Guelph.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/uio.h>
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#include <sys/ucred.h>
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#include <sys/mount.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <rpc/rpc.h>
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#include <rpc/pmap_clnt.h>
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#include <rpc/pmap_prot.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsproto.h>
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#include <nfs/nfs.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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/* Global defs */
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#ifdef DEBUG
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#define	syslog(e, s, ...)			\
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do {						\
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	fprintf(stderr, (s), ##__VA_ARGS__);	\
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	fprintf(stderr, "\n");			\
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} while (0)
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int	debug = 1;
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#else
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int	debug = 0;
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#endif
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struct	nfsd_srvargs nsd;
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void	nonfs(int);
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void	reapchild(int);
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void	usage(void);
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#define	MAXNFSDCNT	20
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#define	DEFNFSDCNT	 4
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/*
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 * Nfs server daemon mostly just a user context for nfssvc()
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 *
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 * 1 - do file descriptor and signal cleanup
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 * 2 - fork the nfsd(s)
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 * 3 - create server socket(s)
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 * 4 - register socket with portmap
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 *
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 * For connectionless protocols, just pass the socket into the kernel via.
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 * nfssvc().
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 * For connection based sockets, loop doing accepts. When you get a new
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 * socket from accept, pass the msgsock into the kernel via. nfssvc().
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 * The arguments are:
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 *	-r - reregister with portmapper
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 *	-t - support tcp nfs clients
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 *	-u - support udp nfs clients
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 * followed by "n" which is the number of nfsds' to fork off
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 */
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int
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main(int argc, char *argv[])
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{
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	struct nfsd_args nfsdargs;
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	struct sockaddr_in inetaddr;
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	int ch, connect_type_cnt, i;
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	int nfsdcnt = DEFNFSDCNT, on, reregister = 0, sock;
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	int udpflag = 0, tcpflag = 0, tcpsock;
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	const char *errstr = NULL;
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	/* Start by writing to both console and log. */
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	openlog("nfsd", LOG_PID | LOG_PERROR, LOG_DAEMON);
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	if (argc == 1)
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		udpflag = 1;
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	while ((ch = getopt(argc, argv, "n:rtu")) != -1)
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		switch (ch) {
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		case 'n':
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			nfsdcnt = strtonum(optarg, 1, MAXNFSDCNT, &errstr);
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			if (errstr) {
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				syslog(LOG_ERR, "nfsd count is %s: %s", errstr, optarg);
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				return(1);
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			}
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			break;
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		case 'r':
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			reregister = 1;
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			break;
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		case 't':
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			tcpflag = 1;
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			break;
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		case 'u':
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			udpflag = 1;
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			break;
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		default:
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			usage();
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		};
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	argv += optind;
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	argc -= optind;
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	/*
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	 * XXX
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	 * Backward compatibility, trailing number is the count of daemons.
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	 */
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	if (argc > 1)
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		usage();
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	if (argc == 1) {
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		nfsdcnt = strtonum(argv[0], 1, MAXNFSDCNT, &errstr);
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		if (errstr) {
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			syslog(LOG_ERR, "nfsd count is %s: %s", errstr, optarg);
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			return(1);
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		}
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	}
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	if (debug == 0) {
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		daemon(0, 0);
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		(void)signal(SIGHUP, SIG_IGN);
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		(void)signal(SIGINT, SIG_IGN);
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		(void)signal(SIGQUIT, SIG_IGN);
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		(void)signal(SIGSYS, nonfs);
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	}
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	(void)signal(SIGCHLD, reapchild);
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	if (reregister) {
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		if (udpflag &&
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		    (!pmap_set(RPCPROG_NFS, 2, IPPROTO_UDP, NFS_PORT) ||
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		     !pmap_set(RPCPROG_NFS, 3, IPPROTO_UDP, NFS_PORT))) {
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			syslog(LOG_ERR, "can't register with portmap for UDP (%s).",
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			    strerror(errno));
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			return (1);
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		}
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		if (tcpflag &&
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		    (!pmap_set(RPCPROG_NFS, 2, IPPROTO_TCP, NFS_PORT) ||
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		     !pmap_set(RPCPROG_NFS, 3, IPPROTO_TCP, NFS_PORT))) {
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			syslog(LOG_ERR, "can't register with portmap for TCP (%s).",
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			    strerror(errno));
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			return (1);
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		}
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		return (0);
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	}
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	/* Cut back to writing to log only. */
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	closelog();
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	openlog("nfsd", LOG_PID, LOG_DAEMON);
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	for (i = 0; i < nfsdcnt; i++) {
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		switch (fork()) {
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		case -1:
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			syslog(LOG_ERR, "fork: %s", strerror(errno));
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			return (1);
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		case 0:
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			break;
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		default:
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			continue;
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		}
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		setproctitle("server");
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		nsd.nsd_nfsd = NULL;
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		if (nfssvc(NFSSVC_NFSD, &nsd) < 0) {
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			syslog(LOG_ERR, "nfssvc: %s", strerror(errno));
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			return (1);
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		}
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		return (0);
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	}
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	/* If we are serving udp, set up the socket. */
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	if (udpflag) {
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		if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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			syslog(LOG_ERR, "can't create udp socket");
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			return (1);
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		}
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		memset(&inetaddr, 0, sizeof inetaddr);
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		inetaddr.sin_family = AF_INET;
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		inetaddr.sin_addr.s_addr = INADDR_ANY;
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		inetaddr.sin_port = htons(NFS_PORT);
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		inetaddr.sin_len = sizeof(inetaddr);
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		if (bind(sock, (struct sockaddr *)&inetaddr,
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		    sizeof(inetaddr)) < 0) {
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			syslog(LOG_ERR, "can't bind udp addr");
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			return (1);
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		}
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		if (!pmap_set(RPCPROG_NFS, 2, IPPROTO_UDP, NFS_PORT) ||
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		    !pmap_set(RPCPROG_NFS, 3, IPPROTO_UDP, NFS_PORT)) {
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			syslog(LOG_ERR, "can't register with udp portmap");
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			return (1);
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		}
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		nfsdargs.sock = sock;
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		nfsdargs.name = NULL;
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		nfsdargs.namelen = 0;
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		if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) {
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			syslog(LOG_ERR, "can't Add UDP socket");
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			return (1);
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		}
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		(void)close(sock);
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	}
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	/* Now set up the master server socket waiting for tcp connections. */
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	on = 1;
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	connect_type_cnt = 0;
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	if (tcpflag) {
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		if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
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			syslog(LOG_ERR, "can't create tcp socket");
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			return (1);
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		}
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		if (setsockopt(tcpsock,
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		    SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
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			syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %s", strerror(errno));
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		memset(&inetaddr, 0, sizeof inetaddr);
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		inetaddr.sin_family = AF_INET;
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		inetaddr.sin_addr.s_addr = INADDR_ANY;
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		inetaddr.sin_port = htons(NFS_PORT);
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		inetaddr.sin_len = sizeof(inetaddr);
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		if (bind(tcpsock, (struct sockaddr *)&inetaddr,
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		    sizeof (inetaddr)) < 0) {
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			syslog(LOG_ERR, "can't bind tcp addr");
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			return (1);
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		}
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		if (listen(tcpsock, 5) < 0) {
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			syslog(LOG_ERR, "listen failed");
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			return (1);
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		}
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		if (!pmap_set(RPCPROG_NFS, 2, IPPROTO_TCP, NFS_PORT) ||
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		    !pmap_set(RPCPROG_NFS, 3, IPPROTO_TCP, NFS_PORT)) {
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			syslog(LOG_ERR, "can't register tcp with portmap");
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			return (1);
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		}
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		connect_type_cnt++;
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	}
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	if (connect_type_cnt == 0)
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		return (0);
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	setproctitle("master");
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	/*
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	 * Loop forever accepting connections and passing the sockets
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	 * into the kernel for the mounts.
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	 */
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	for (;;) {
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		struct pollfd		pfd;
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		struct sockaddr_in	inetpeer;
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		int ret, msgsock;
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		socklen_t len;
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		pfd.fd = tcpsock;
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		pfd.events = POLLIN;
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		if (connect_type_cnt > 1) {
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			ret = poll(&pfd, 1, INFTIM);
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			if (ret < 1) {
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				syslog(LOG_ERR, "poll failed: %s", strerror(errno));
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				return (1);
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			}
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		}
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		if (tcpflag) {
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			len = sizeof(inetpeer);
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			if ((msgsock = accept(tcpsock,
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			    (struct sockaddr *)&inetpeer, &len)) < 0) {
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				if (errno == EWOULDBLOCK || errno == EINTR ||
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				    errno == ECONNABORTED)
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					continue;
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				syslog(LOG_ERR, "accept failed: %s", strerror(errno));
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				return (1);
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			}
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			memset(inetpeer.sin_zero, 0, sizeof(inetpeer.sin_zero));
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			if (setsockopt(msgsock, SOL_SOCKET,
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			    SO_KEEPALIVE, &on, sizeof(on)) < 0)
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				syslog(LOG_ERR,
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				    "setsockopt SO_KEEPALIVE: %s", strerror(errno));
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			nfsdargs.sock = msgsock;
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			nfsdargs.name = (caddr_t)&inetpeer;
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			nfsdargs.namelen = sizeof(inetpeer);
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			if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) {
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				syslog(LOG_ERR, "can't Add TCP socket");
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				return (1);
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			}
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			(void)close(msgsock);
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		}
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	}
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}
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void
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usage(void)
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{
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	(void)fprintf(stderr, "usage: nfsd [-rtu] [-n num_servers]\n");
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	exit(1);
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}
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/* ARGSUSED */
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void
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nonfs(int signo)
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{
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	int save_errno = errno;
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	struct syslog_data sdata = SYSLOG_DATA_INIT;
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	syslog_r(LOG_ERR, &sdata, "missing system call: NFS not available.");
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	errno = save_errno;
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}
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/* ARGSUSED */
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void
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reapchild(int signo)
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{
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	int save_errno = errno;
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	while (wait3(NULL, WNOHANG, NULL) > 0)
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		continue;
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	errno = save_errno;
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}