622 lines
15 KiB
C
622 lines
15 KiB
C
/* $NetBSD: nfsd.c,v 1.73 2020/09/17 12:48:12 christos 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/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)nfsd.c 8.9 (Berkeley) 3/29/95";
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#else
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__RCSID("$NetBSD: nfsd.c,v 1.73 2020/09/17 12:48:12 christos Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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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 <poll.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 <paths.h>
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#include <pwd.h>
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#include <pthread.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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#include <netdb.h>
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#ifdef NFSD_RUMP
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#include <rump/rump.h>
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#include <rump/rump_syscallshotgun.h>
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#include <rump/rump_syscalls.h>
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#define nfssvc(a, b) rump_sys_nfssvc((a), (b))
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#define close(a) rump_sys_close(a)
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#define poll(a, b, c) rump_sys_poll((a), (b), (c))
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#if 0
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#define socket(a, b, c) rump_sys_socket((a), (b), (c))
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#define setsockopt(a, b, c, d, e) rump_sys_setsockopt((a), (b), (c), (d), (e))
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#define bind(a, b, c) rump_sys_bind((a), (b), (c))
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#define listen(a, b) rump_sys_listen((a), (b))
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#define accept(a, b, c) rump_sys_accept((a), (b), (c))
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#endif
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#define main nfsd_main
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int nfsd_main(int, char *[]);
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#endif
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/* Global defs */
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#if defined(DEBUG) || defined(NFSD_RUMP)
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static int debug = 1;
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#else
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static int debug = 0;
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#endif
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#define logit(e, s, args...) \
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do { \
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if (debug) { \
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fprintf(stderr,(s), ## args); \
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fprintf(stderr, "\n"); \
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} else { \
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syslog(e, s, ## args); \
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} \
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} while (/*CONSTCOND*/0)
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static void nonfs(int);
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__dead static void usage(void);
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static void *
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worker(void *dummy)
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{
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struct nfsd_srvargs nsd;
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int nfssvc_flag;
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pthread_setname_np(pthread_self(), "slave", NULL);
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nfssvc_flag = NFSSVC_NFSD;
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memset(&nsd, 0, sizeof(nsd));
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while (nfssvc(nfssvc_flag, &nsd) == -1) {
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if (errno != ENEEDAUTH) {
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logit(LOG_ERR, "nfssvc: %s", strerror(errno));
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exit(EXIT_FAILURE);
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}
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nfssvc_flag = NFSSVC_NFSD | NFSSVC_AUTHINFAIL;
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}
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return NULL;
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}
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struct conf {
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struct addrinfo *ai;
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struct netconfig *nc;
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struct netbuf nb;
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struct pollfd pfd;
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};
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#define NFS_UDP4 0
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#define NFS_TCP4 1
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#define NFS_UDP6 2
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#define NFS_TCP6 3
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static int cfg_family[] = { PF_INET, PF_INET, PF_INET6, PF_INET6 };
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static const char *cfg_netconf[] = { "udp", "tcp", "udp6", "tcp6" };
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static int cfg_socktype[] = {
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SOCK_DGRAM, SOCK_STREAM, SOCK_DGRAM, SOCK_STREAM };
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static int cfg_protocol[] = {
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IPPROTO_UDP, IPPROTO_TCP, IPPROTO_UDP, IPPROTO_TCP };
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static int
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tryconf(struct conf *cfg, int t, int reregister)
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{
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struct addrinfo hints;
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int ecode;
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memset(&hints, 0, sizeof hints);
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hints.ai_flags = AI_PASSIVE;
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hints.ai_family = cfg_family[t];
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hints.ai_socktype = cfg_socktype[t];
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hints.ai_protocol = cfg_protocol[t];
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ecode = getaddrinfo(NULL, "nfs", &hints, &cfg->ai);
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if (ecode != 0) {
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logit(LOG_ERR, "getaddrinfo %s: %s", cfg_netconf[t],
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gai_strerror(ecode));
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return -1;
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}
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cfg->nc = getnetconfigent(cfg_netconf[t]);
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if (cfg->nc == NULL) {
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logit(LOG_ERR, "getnetconfigent %s failed: %s",
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cfg_netconf[t], strerror(errno));
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goto out;
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}
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cfg->nb.buf = cfg->ai->ai_addr;
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cfg->nb.len = cfg->nb.maxlen = cfg->ai->ai_addrlen;
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if (reregister)
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if (!rpcb_set(RPCPROG_NFS, 2, cfg->nc, &cfg->nb)) {
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logit(LOG_ERR, "rpcb_set %s failed", cfg_netconf[t]);
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goto out1;
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}
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return 0;
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out1:
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freenetconfigent(cfg->nc);
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cfg->nc = NULL;
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out:
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freeaddrinfo(cfg->ai);
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cfg->ai = NULL;
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return -1;
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}
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static int
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setupsock(struct conf *cfg, struct pollfd *set, int p)
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{
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int sock;
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struct nfsd_args nfsdargs;
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struct addrinfo *ai = cfg->ai;
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int on = 1;
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sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
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if (sock == -1) {
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logit(LOG_ERR, "can't create %s socket: %s", cfg_netconf[p],
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strerror(errno));
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return -1;
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}
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if (cfg_family[p] == PF_INET6) {
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if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on,
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sizeof(on)) == -1) {
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logit(LOG_ERR, "can't set v6-only binding for %s "
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"socket: %s", cfg_netconf[p], strerror(errno));
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goto out;
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}
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}
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if (cfg_protocol[p] == IPPROTO_TCP) {
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on,
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sizeof(on)) == -1) {
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logit(LOG_ERR, "setsockopt SO_REUSEADDR for %s: %s",
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cfg_netconf[p], strerror(errno));
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goto out;
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}
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}
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if (bind(sock, ai->ai_addr, ai->ai_addrlen) == -1) {
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logit(LOG_ERR, "can't bind %s addr: %s", cfg_netconf[p],
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strerror(errno));
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goto out;
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}
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if (cfg_protocol[p] == IPPROTO_TCP) {
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if (listen(sock, 5) == -1) {
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logit(LOG_ERR, "listen failed");
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goto out;
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}
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}
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if (!rpcb_set(RPCPROG_NFS, 2, cfg->nc, &cfg->nb) ||
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!rpcb_set(RPCPROG_NFS, 3, cfg->nc, &cfg->nb)) {
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logit(LOG_ERR, "can't register with %s portmap",
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cfg_netconf[p]);
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goto out;
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}
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if (cfg_protocol[p] == IPPROTO_TCP)
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set->fd = sock;
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else {
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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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logit(LOG_ERR, "can't add %s socket: %s",
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cfg_netconf[p], strerror(errno));
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goto out;
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}
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(void)close(sock);
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}
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return 0;
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out:
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(void)close(sock);
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return -1;
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}
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/*
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* The functions daemon2_fork() and daemon2_detach() below provide
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* functionality similar to daemon(3) but split into two phases.
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* daemon2_fork() is called early, before creating resources that
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* cannot be inherited across a fork, such as threads or kqueues.
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* When the daemon is ready to provide service, daemon2_detach()
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* is called to complete the daemonization and signal the parent
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* process to exit.
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*
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* These functions could potentially be moved to a library and
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* shared by other daemons.
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*
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* The return value from daemon2_fork() is a file descriptor to
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* be passed as the first argument to daemon2_detach().
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*/
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static int
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daemon2_fork(void)
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{
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int i;
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int fd;
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int r;
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pid_t pid;
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int detach_msg_pipe[2];
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/*
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* Set up a pipe for signalling the parent, making sure the
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* write end does not get allocated one of the file
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* descriptors that may be closed in daemon2_detach(). The
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* read end does not need such protection.
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*/
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for (i = 0; i < 3; i++) {
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r = pipe2(detach_msg_pipe, O_CLOEXEC|O_NOSIGPIPE);
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if (r == -1)
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return -1;
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if (detach_msg_pipe[1] <= STDERR_FILENO &&
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(fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
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(void)dup2(fd, detach_msg_pipe[0]);
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(void)dup2(fd, detach_msg_pipe[1]);
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if (fd > STDERR_FILENO)
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(void)close(fd);
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continue;
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}
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break;
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}
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pid = fork();
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switch (pid) {
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case -1:
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return -1;
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case 0:
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/* child */
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(void)close(detach_msg_pipe[0]);
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return detach_msg_pipe[1];
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default:
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break;
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}
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/* Parent */
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(void)close(detach_msg_pipe[1]);
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for (;;) {
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ssize_t nread;
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char dummy;
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nread = read(detach_msg_pipe[0], &dummy, 1);
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if (nread == -1) {
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if (errno == EINTR)
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continue;
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_exit(EXIT_FAILURE);
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} else if (nread == 0) {
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_exit(EXIT_FAILURE);
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} else { /* nread > 0 */
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_exit(EXIT_SUCCESS);
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}
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}
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}
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static int
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daemon2_detach(int parentfd, int nochdir, int noclose)
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{
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int fd;
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if (setsid() == -1)
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return -1;
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if (!nochdir)
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(void)chdir("/");
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if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
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(void)dup2(fd, STDIN_FILENO);
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(void)dup2(fd, STDOUT_FILENO);
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(void)dup2(fd, STDERR_FILENO);
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if (fd > STDERR_FILENO)
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(void)close(fd);
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}
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while (1) {
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ssize_t r = write(parentfd, "", 1);
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if (r == -1) {
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if (errno == EINTR)
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continue;
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else if (errno == EPIPE)
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break;
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else
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return -1;
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} else if (r == 0) {
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/* Should not happen */
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return -1;
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} else {
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break;
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}
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}
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(void)close(parentfd);
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return 0;
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}
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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 - create the nfsd thread(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 only tcp nfs clients
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* -u - support only udp nfs clients
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* -n num how many threads to create.
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* -4 - use only ipv4
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* -6 - use only ipv6
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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 conf cfg[4];
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struct pollfd set[__arraycount(cfg)];
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int ch, connect_type_cnt;
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size_t i, nfsdcnt;
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int reregister;
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int tcpflag, udpflag;
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int ip6flag, ip4flag;
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int s, compat;
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int parent_fd = -1;
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pthread_t *workers;
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#define DEFNFSDCNT 4
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nfsdcnt = DEFNFSDCNT;
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compat = reregister = 0;
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tcpflag = udpflag = 1;
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ip6flag = ip4flag = 1;
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#define GETOPT "46dn:rtu"
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#define USAGE "[-46drtu] [-n num_servers]"
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while ((ch = getopt(argc, argv, GETOPT)) != -1) {
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switch (ch) {
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case '6':
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ip6flag = 1;
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ip4flag = 0;
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s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
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if (s == -1 && (errno == EPROTONOSUPPORT ||
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errno == EPFNOSUPPORT || errno == EAFNOSUPPORT))
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ip6flag = 0;
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else
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close(s);
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break;
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case '4':
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ip6flag = 0;
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ip4flag = 1;
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s = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (s == -1 && (errno == EPROTONOSUPPORT ||
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errno == EPFNOSUPPORT || errno == EAFNOSUPPORT))
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ip4flag = 0;
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else
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close(s);
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break;
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case 'd':
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debug++;
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break;
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case 'n':
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nfsdcnt = atoi(optarg);
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if (nfsdcnt < 1) {
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warnx("nfsd count %zu; reset to %d", nfsdcnt,
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DEFNFSDCNT);
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nfsdcnt = DEFNFSDCNT;
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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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compat |= 2;
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tcpflag = 1;
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udpflag = 0;
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break;
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case 'u':
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compat |= 1;
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tcpflag = 0;
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udpflag = 1;
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break;
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default:
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case '?':
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usage();
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}
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}
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argv += optind;
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argc -= optind;
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if (compat == 3) {
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warnx("Old -tu options detected; enabling both udp and tcp.");
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warnx("This is the default behavior now and you can remove");
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warnx("all options.");
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tcpflag = udpflag = 1;
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if (ip6flag == 1 && ip4flag == 0)
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ip4flag = 1;
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}
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if (debug == 0) {
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parent_fd = daemon2_fork();
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if (parent_fd == -1)
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logit(LOG_ERR, "daemon2_fork failed");
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openlog("nfsd", LOG_PID, LOG_DAEMON);
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}
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memset(cfg, 0, sizeof(cfg));
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for (i = 0; i < __arraycount(cfg); i++) {
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if (ip4flag == 0 && cfg_family[i] == PF_INET)
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continue;
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if (ip6flag == 0 && cfg_family[i] == PF_INET6)
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continue;
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if (tcpflag == 0 && cfg_protocol[i] == IPPROTO_TCP)
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|
continue;
|
|
if (udpflag == 0 && cfg_protocol[i] == IPPROTO_UDP)
|
|
continue;
|
|
tryconf(&cfg[i], i, reregister);
|
|
}
|
|
|
|
workers = calloc(nfsdcnt, sizeof(*workers));
|
|
if (workers == NULL) {
|
|
logit(LOG_ERR, "thread alloc %s", strerror(errno));
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
for (i = 0; i < nfsdcnt; i++) {
|
|
int error;
|
|
|
|
error = pthread_create(&workers[i], NULL, worker, NULL);
|
|
if (error) {
|
|
errno = error;
|
|
logit(LOG_ERR, "pthread_create: %s", strerror(errno));
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
connect_type_cnt = 0;
|
|
for (i = 0; i < __arraycount(cfg); i++) {
|
|
set[i].fd = -1;
|
|
set[i].events = POLLIN;
|
|
set[i].revents = 0;
|
|
|
|
if (cfg[i].nc == NULL)
|
|
continue;
|
|
|
|
setupsock(&cfg[i], &set[i], i);
|
|
if (set[i].fd != -1)
|
|
connect_type_cnt++;
|
|
}
|
|
|
|
pthread_setname_np(pthread_self(), "master", NULL);
|
|
|
|
if (debug == 0) {
|
|
daemon2_detach(parent_fd, 0, 0);
|
|
(void)signal(SIGHUP, SIG_IGN);
|
|
(void)signal(SIGINT, SIG_IGN);
|
|
(void)signal(SIGQUIT, SIG_IGN);
|
|
(void)signal(SIGSYS, nonfs);
|
|
}
|
|
|
|
if (connect_type_cnt == 0) {
|
|
for (i = 0; i < nfsdcnt; i++)
|
|
pthread_join(workers[i], NULL);
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* Loop forever accepting connections and passing the sockets
|
|
* into the kernel for the mounts.
|
|
*/
|
|
for (;;) {
|
|
if (poll(set, __arraycount(set), INFTIM) == -1) {
|
|
logit(LOG_ERR, "poll failed: %s", strerror(errno));
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
for (i = 0; i < __arraycount(set); i++) {
|
|
struct nfsd_args nfsdargs;
|
|
struct sockaddr_storage ss;
|
|
socklen_t len;
|
|
int msgsock;
|
|
int on = 1;
|
|
|
|
if ((set[i].revents & POLLIN) == 0)
|
|
continue;
|
|
len = sizeof(ss);
|
|
if ((msgsock = accept(set[i].fd,
|
|
(struct sockaddr *)&ss, &len)) == -1) {
|
|
int serrno = errno;
|
|
logit(LOG_ERR, "accept failed: %s",
|
|
strerror(errno));
|
|
if (serrno == EINTR || serrno == ECONNABORTED)
|
|
continue;
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
if (setsockopt(msgsock, SOL_SOCKET, SO_KEEPALIVE, &on,
|
|
sizeof(on)) == -1)
|
|
logit(LOG_ERR, "setsockopt SO_KEEPALIVE: %s",
|
|
strerror(errno));
|
|
nfsdargs.sock = msgsock;
|
|
nfsdargs.name = (void *)&ss;
|
|
nfsdargs.namelen = len;
|
|
nfssvc(NFSSVC_ADDSOCK, &nfsdargs);
|
|
(void)close(msgsock);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr, "Usage: %s %s\n", getprogname(), USAGE);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
static void
|
|
nonfs(int signo)
|
|
{
|
|
logit(LOG_ERR, "missing system call: NFS not available.");
|
|
}
|