349 lines
9.0 KiB
C
349 lines
9.0 KiB
C
/* $OpenBSD: nfsd.c,v 1.42 2024/03/21 10:58:15 claudio 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 <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) == -1) {
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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)) == -1) {
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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)) == -1) {
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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) == -1) {
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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)) == -1) {
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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)) == -1)
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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)) == -1) {
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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) == -1) {
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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)) == -1) {
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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)) == -1)
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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) == -1) {
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syslog(LOG_ERR, "can't Add TCP socket");
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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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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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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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}
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