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freebsd-skq/usr.sbin/nfsd/nfsd.c
Warner Losh fbbd9655e5 Renumber copyright clause 4 
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by:	Jan Schaumann <jschauma@stevens.edu>
Pull Request:	https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00

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/*
* 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 char sccsid[] = "@(#)nfsd.c 8.9 (Berkeley) 3/29/95";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/syslog.h>
#include <sys/wait.h>
#include <sys/mount.h>
#include <sys/fcntl.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/ucred.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpcsvc/nfs_prot.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <nfsserver/nfs.h>
#include <nfs/nfssvc.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sysexits.h>
#include <getopt.h>
static int debug = 0;
#define NFSD_STABLERESTART "/var/db/nfs-stablerestart"
#define NFSD_STABLEBACKUP "/var/db/nfs-stablerestart.bak"
#define MAXNFSDCNT 256
#define DEFNFSDCNT 4
#define NFS_VER2 2
#define NFS_VER3 3
#define NFS_VER4 4
static pid_t children[MAXNFSDCNT]; /* PIDs of children */
static int nfsdcnt; /* number of children */
static int nfsdcnt_set;
static int minthreads;
static int maxthreads;
static int nfssvc_nfsd; /* Set to correct NFSSVC_xxx flag */
static int stablefd = -1; /* Fd for the stable restart file */
static int backupfd; /* Fd for the backup stable restart file */
static const char *getopt_shortopts;
static const char *getopt_usage;
static int minthreads_set;
static int maxthreads_set;
static struct option longopts[] = {
{ "debug", no_argument, &debug, 1 },
{ "minthreads", required_argument, &minthreads_set, 1 },
{ "maxthreads", required_argument, &maxthreads_set, 1 },
{ NULL, 0, NULL, 0}
};
static void cleanup(int);
static void child_cleanup(int);
static void killchildren(void);
static void nfsd_exit(int);
static void nonfs(int);
static void reapchild(int);
static int setbindhost(struct addrinfo **ia, const char *bindhost,
struct addrinfo hints);
static void start_server(int);
static void unregistration(void);
static void usage(void);
static void open_stable(int *, int *);
static void copy_stable(int, int);
static void backup_stable(int);
static void set_nfsdcnt(int);
/*
* 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 rpcbind
*
* 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 rpcbind
* -d - unregister with rpcbind
* -t - support tcp nfs clients
* -u - support udp nfs clients
* -e - forces it to run a server that supports nfsv4
* followed by "n" which is the number of nfsds' to fork off
*/
int
main(int argc, char **argv)
{
struct nfsd_addsock_args addsockargs;
struct addrinfo *ai_udp, *ai_tcp, *ai_udp6, *ai_tcp6, hints;
struct netconfig *nconf_udp, *nconf_tcp, *nconf_udp6, *nconf_tcp6;
struct netbuf nb_udp, nb_tcp, nb_udp6, nb_tcp6;
struct sockaddr_in inetpeer;
struct sockaddr_in6 inet6peer;
fd_set ready, sockbits;
fd_set v4bits, v6bits;
int ch, connect_type_cnt, i, maxsock, msgsock;
socklen_t len;
int on = 1, unregister, reregister, sock;
int tcp6sock, ip6flag, tcpflag, tcpsock;
int udpflag, ecode, error, s;
int bindhostc, bindanyflag, rpcbreg, rpcbregcnt;
int nfssvc_addsock;
int longindex = 0;
int nfs_minvers = NFS_VER2;
size_t nfs_minvers_size;
const char *lopt;
char **bindhost = NULL;
pid_t pid;
nfsdcnt = DEFNFSDCNT;
unregister = reregister = tcpflag = maxsock = 0;
bindanyflag = udpflag = connect_type_cnt = bindhostc = 0;
getopt_shortopts = "ah:n:rdtue";
getopt_usage =
"usage:\n"
" nfsd [-ardtue] [-h bindip]\n"
" [-n numservers] [--minthreads #] [--maxthreads #]\n";
while ((ch = getopt_long(argc, argv, getopt_shortopts, longopts,
&longindex)) != -1)
switch (ch) {
case 'a':
bindanyflag = 1;
break;
case 'n':
set_nfsdcnt(atoi(optarg));
break;
case 'h':
bindhostc++;
bindhost = realloc(bindhost,sizeof(char *)*bindhostc);
if (bindhost == NULL)
errx(1, "Out of memory");
bindhost[bindhostc-1] = strdup(optarg);
if (bindhost[bindhostc-1] == NULL)
errx(1, "Out of memory");
break;
case 'r':
reregister = 1;
break;
case 'd':
unregister = 1;
break;
case 't':
tcpflag = 1;
break;
case 'u':
udpflag = 1;
break;
case 'e':
/* now a no-op, since this is the default */
break;
case 0:
lopt = longopts[longindex].name;
if (!strcmp(lopt, "minthreads")) {
minthreads = atoi(optarg);
} else if (!strcmp(lopt, "maxthreads")) {
maxthreads = atoi(optarg);
}
break;
default:
case '?':
usage();
}
if (!tcpflag && !udpflag)
udpflag = 1;
argv += optind;
argc -= optind;
if (minthreads_set && maxthreads_set && minthreads > maxthreads)
errx(EX_USAGE,
"error: minthreads(%d) can't be greater than "
"maxthreads(%d)", minthreads, maxthreads);
/*
* XXX
* Backward compatibility, trailing number is the count of daemons.
*/
if (argc > 1)
usage();
if (argc == 1)
set_nfsdcnt(atoi(argv[0]));
/*
* Unless the "-o" option was specified, try and run "nfsd".
* If "-o" was specified, try and run "nfsserver".
*/
if (modfind("nfsd") < 0) {
/* Not present in kernel, try loading it */
if (kldload("nfsd") < 0 || modfind("nfsd") < 0)
errx(1, "NFS server is not available");
}
ip6flag = 1;
s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if (s == -1) {
if (errno != EPROTONOSUPPORT && errno != EAFNOSUPPORT)
err(1, "socket");
ip6flag = 0;
} else if (getnetconfigent("udp6") == NULL ||
getnetconfigent("tcp6") == NULL) {
ip6flag = 0;
}
if (s != -1)
close(s);
if (bindhostc == 0 || bindanyflag) {
bindhostc++;
bindhost = realloc(bindhost,sizeof(char *)*bindhostc);
if (bindhost == NULL)
errx(1, "Out of memory");
bindhost[bindhostc-1] = strdup("*");
if (bindhost[bindhostc-1] == NULL)
errx(1, "Out of memory");
}
nfs_minvers_size = sizeof(nfs_minvers);
error = sysctlbyname("vfs.nfsd.server_min_nfsvers", &nfs_minvers,
&nfs_minvers_size, NULL, 0);
if (error != 0 || nfs_minvers < NFS_VER2 || nfs_minvers > NFS_VER4) {
warnx("sysctlbyname(vfs.nfsd.server_min_nfsvers) failed,"
" defaulting to NFSv2");
nfs_minvers = NFS_VER2;
}
if (unregister) {
unregistration();
exit (0);
}
if (reregister) {
if (udpflag) {
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp);
if (ecode != 0)
err(1, "getaddrinfo udp: %s", gai_strerror(ecode));
nconf_udp = getnetconfigent("udp");
if (nconf_udp == NULL)
err(1, "getnetconfigent udp failed");
nb_udp.buf = ai_udp->ai_addr;
nb_udp.len = nb_udp.maxlen = ai_udp->ai_addrlen;
if (nfs_minvers == NFS_VER2)
if (!rpcb_set(NFS_PROGRAM, 2, nconf_udp,
&nb_udp))
err(1, "rpcb_set udp failed");
if (nfs_minvers <= NFS_VER3)
if (!rpcb_set(NFS_PROGRAM, 3, nconf_udp,
&nb_udp))
err(1, "rpcb_set udp failed");
freeaddrinfo(ai_udp);
}
if (udpflag && ip6flag) {
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp6);
if (ecode != 0)
err(1, "getaddrinfo udp6: %s", gai_strerror(ecode));
nconf_udp6 = getnetconfigent("udp6");
if (nconf_udp6 == NULL)
err(1, "getnetconfigent udp6 failed");
nb_udp6.buf = ai_udp6->ai_addr;
nb_udp6.len = nb_udp6.maxlen = ai_udp6->ai_addrlen;
if (nfs_minvers == NFS_VER2)
if (!rpcb_set(NFS_PROGRAM, 2, nconf_udp6,
&nb_udp6))
err(1, "rpcb_set udp6 failed");
if (nfs_minvers <= NFS_VER3)
if (!rpcb_set(NFS_PROGRAM, 3, nconf_udp6,
&nb_udp6))
err(1, "rpcb_set udp6 failed");
freeaddrinfo(ai_udp6);
}
if (tcpflag) {
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp);
if (ecode != 0)
err(1, "getaddrinfo tcp: %s", gai_strerror(ecode));
nconf_tcp = getnetconfigent("tcp");
if (nconf_tcp == NULL)
err(1, "getnetconfigent tcp failed");
nb_tcp.buf = ai_tcp->ai_addr;
nb_tcp.len = nb_tcp.maxlen = ai_tcp->ai_addrlen;
if (nfs_minvers == NFS_VER2)
if (!rpcb_set(NFS_PROGRAM, 2, nconf_tcp,
&nb_tcp))
err(1, "rpcb_set tcp failed");
if (nfs_minvers <= NFS_VER3)
if (!rpcb_set(NFS_PROGRAM, 3, nconf_tcp,
&nb_tcp))
err(1, "rpcb_set tcp failed");
freeaddrinfo(ai_tcp);
}
if (tcpflag && ip6flag) {
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp6);
if (ecode != 0)
err(1, "getaddrinfo tcp6: %s", gai_strerror(ecode));
nconf_tcp6 = getnetconfigent("tcp6");
if (nconf_tcp6 == NULL)
err(1, "getnetconfigent tcp6 failed");
nb_tcp6.buf = ai_tcp6->ai_addr;
nb_tcp6.len = nb_tcp6.maxlen = ai_tcp6->ai_addrlen;
if (nfs_minvers == NFS_VER2)
if (!rpcb_set(NFS_PROGRAM, 2, nconf_tcp6,
&nb_tcp6))
err(1, "rpcb_set tcp6 failed");
if (nfs_minvers <= NFS_VER3)
if (!rpcb_set(NFS_PROGRAM, 3, nconf_tcp6,
&nb_tcp6))
err(1, "rpcb_set tcp6 failed");
freeaddrinfo(ai_tcp6);
}
exit (0);
}
if (debug == 0) {
daemon(0, 0);
(void)signal(SIGHUP, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
/*
* nfsd sits in the kernel most of the time. It needs
* to ignore SIGTERM/SIGQUIT in order to stay alive as long
* as possible during a shutdown, otherwise loopback
* mounts will not be able to unmount.
*/
(void)signal(SIGTERM, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
}
(void)signal(SIGSYS, nonfs);
(void)signal(SIGCHLD, reapchild);
(void)signal(SIGUSR2, backup_stable);
openlog("nfsd", LOG_PID | (debug ? LOG_PERROR : 0), LOG_DAEMON);
/*
* For V4, we open the stablerestart file and call nfssvc()
* to get it loaded. This is done before the daemons do the
* regular nfssvc() call to service NFS requests.
* (This way the file remains open until the last nfsd is killed
* off.)
* It and the backup copy will be created as empty files
* the first time this nfsd is started and should never be
* deleted/replaced if at all possible. It should live on a
* local, non-volatile storage device that does not do hardware
* level write-back caching. (See SCSI doc for more information
* on how to prevent write-back caching on SCSI disks.)
*/
open_stable(&stablefd, &backupfd);
if (stablefd < 0) {
syslog(LOG_ERR, "Can't open %s: %m\n", NFSD_STABLERESTART);
exit(1);
}
/* This system call will fail for old kernels, but that's ok. */
nfssvc(NFSSVC_BACKUPSTABLE, NULL);
if (nfssvc(NFSSVC_STABLERESTART, (caddr_t)&stablefd) < 0) {
syslog(LOG_ERR, "Can't read stable storage file: %m\n");
exit(1);
}
nfssvc_addsock = NFSSVC_NFSDADDSOCK;
nfssvc_nfsd = NFSSVC_NFSDNFSD;
if (tcpflag) {
/*
* For TCP mode, we fork once to start the first
* kernel nfsd thread. The kernel will add more
* threads as needed.
*/
pid = fork();
if (pid == -1) {
syslog(LOG_ERR, "fork: %m");
nfsd_exit(1);
}
if (pid) {
children[0] = pid;
} else {
(void)signal(SIGUSR1, child_cleanup);
setproctitle("server");
start_server(0);
}
}
(void)signal(SIGUSR1, cleanup);
FD_ZERO(&v4bits);
FD_ZERO(&v6bits);
FD_ZERO(&sockbits);
rpcbregcnt = 0;
/* Set up the socket for udp and rpcb register it. */
if (udpflag) {
rpcbreg = 0;
for (i = 0; i < bindhostc; i++) {
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
if (setbindhost(&ai_udp, bindhost[i], hints) == 0) {
rpcbreg = 1;
rpcbregcnt++;
if ((sock = socket(ai_udp->ai_family,
ai_udp->ai_socktype,
ai_udp->ai_protocol)) < 0) {
syslog(LOG_ERR,
"can't create udp socket");
nfsd_exit(1);
}
if (bind(sock, ai_udp->ai_addr,
ai_udp->ai_addrlen) < 0) {
syslog(LOG_ERR,
"can't bind udp addr %s: %m",
bindhost[i]);
nfsd_exit(1);
}
freeaddrinfo(ai_udp);
addsockargs.sock = sock;
addsockargs.name = NULL;
addsockargs.namelen = 0;
if (nfssvc(nfssvc_addsock, &addsockargs) < 0) {
syslog(LOG_ERR, "can't Add UDP socket");
nfsd_exit(1);
}
(void)close(sock);
}
}
if (rpcbreg == 1) {
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp);
if (ecode != 0) {
syslog(LOG_ERR, "getaddrinfo udp: %s",
gai_strerror(ecode));
nfsd_exit(1);
}
nconf_udp = getnetconfigent("udp");
if (nconf_udp == NULL)
err(1, "getnetconfigent udp failed");
nb_udp.buf = ai_udp->ai_addr;
nb_udp.len = nb_udp.maxlen = ai_udp->ai_addrlen;
if (nfs_minvers == NFS_VER2)
if (!rpcb_set(NFS_PROGRAM, 2, nconf_udp,
&nb_udp))
err(1, "rpcb_set udp failed");
if (nfs_minvers <= NFS_VER3)
if (!rpcb_set(NFS_PROGRAM, 3, nconf_udp,
&nb_udp))
err(1, "rpcb_set udp failed");
freeaddrinfo(ai_udp);
}
}
/* Set up the socket for udp6 and rpcb register it. */
if (udpflag && ip6flag) {
rpcbreg = 0;
for (i = 0; i < bindhostc; i++) {
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
if (setbindhost(&ai_udp6, bindhost[i], hints) == 0) {
rpcbreg = 1;
rpcbregcnt++;
if ((sock = socket(ai_udp6->ai_family,
ai_udp6->ai_socktype,
ai_udp6->ai_protocol)) < 0) {
syslog(LOG_ERR,
"can't create udp6 socket");
nfsd_exit(1);
}
if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
&on, sizeof on) < 0) {
syslog(LOG_ERR,
"can't set v6-only binding for "
"udp6 socket: %m");
nfsd_exit(1);
}
if (bind(sock, ai_udp6->ai_addr,
ai_udp6->ai_addrlen) < 0) {
syslog(LOG_ERR,
"can't bind udp6 addr %s: %m",
bindhost[i]);
nfsd_exit(1);
}
freeaddrinfo(ai_udp6);
addsockargs.sock = sock;
addsockargs.name = NULL;
addsockargs.namelen = 0;
if (nfssvc(nfssvc_addsock, &addsockargs) < 0) {
syslog(LOG_ERR,
"can't add UDP6 socket");
nfsd_exit(1);
}
(void)close(sock);
}
}
if (rpcbreg == 1) {
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp6);
if (ecode != 0) {
syslog(LOG_ERR, "getaddrinfo udp6: %s",
gai_strerror(ecode));
nfsd_exit(1);
}
nconf_udp6 = getnetconfigent("udp6");
if (nconf_udp6 == NULL)
err(1, "getnetconfigent udp6 failed");
nb_udp6.buf = ai_udp6->ai_addr;
nb_udp6.len = nb_udp6.maxlen = ai_udp6->ai_addrlen;
if (nfs_minvers == NFS_VER2)
if (!rpcb_set(NFS_PROGRAM, 2, nconf_udp6,
&nb_udp6))
err(1,
"rpcb_set udp6 failed");
if (nfs_minvers <= NFS_VER3)
if (!rpcb_set(NFS_PROGRAM, 3, nconf_udp6,
&nb_udp6))
err(1,
"rpcb_set udp6 failed");
freeaddrinfo(ai_udp6);
}
}
/* Set up the socket for tcp and rpcb register it. */
if (tcpflag) {
rpcbreg = 0;
for (i = 0; i < bindhostc; i++) {
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if (setbindhost(&ai_tcp, bindhost[i], hints) == 0) {
rpcbreg = 1;
rpcbregcnt++;
if ((tcpsock = socket(AF_INET, SOCK_STREAM,
0)) < 0) {
syslog(LOG_ERR,
"can't create tcp socket");
nfsd_exit(1);
}
if (setsockopt(tcpsock, SOL_SOCKET,
SO_REUSEADDR,
(char *)&on, sizeof(on)) < 0)
syslog(LOG_ERR,
"setsockopt SO_REUSEADDR: %m");
if (bind(tcpsock, ai_tcp->ai_addr,
ai_tcp->ai_addrlen) < 0) {
syslog(LOG_ERR,
"can't bind tcp addr %s: %m",
bindhost[i]);
nfsd_exit(1);
}
if (listen(tcpsock, -1) < 0) {
syslog(LOG_ERR, "listen failed");
nfsd_exit(1);
}
freeaddrinfo(ai_tcp);
FD_SET(tcpsock, &sockbits);
FD_SET(tcpsock, &v4bits);
maxsock = tcpsock;
connect_type_cnt++;
}
}
if (rpcbreg == 1) {
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
ecode = getaddrinfo(NULL, "nfs", &hints,
&ai_tcp);
if (ecode != 0) {
syslog(LOG_ERR, "getaddrinfo tcp: %s",
gai_strerror(ecode));
nfsd_exit(1);
}
nconf_tcp = getnetconfigent("tcp");
if (nconf_tcp == NULL)
err(1, "getnetconfigent tcp failed");
nb_tcp.buf = ai_tcp->ai_addr;
nb_tcp.len = nb_tcp.maxlen = ai_tcp->ai_addrlen;
if (nfs_minvers == NFS_VER2)
if (!rpcb_set(NFS_PROGRAM, 2, nconf_tcp,
&nb_tcp))
err(1, "rpcb_set tcp failed");
if (nfs_minvers <= NFS_VER3)
if (!rpcb_set(NFS_PROGRAM, 3, nconf_tcp,
&nb_tcp))
err(1, "rpcb_set tcp failed");
freeaddrinfo(ai_tcp);
}
}
/* Set up the socket for tcp6 and rpcb register it. */
if (tcpflag && ip6flag) {
rpcbreg = 0;
for (i = 0; i < bindhostc; i++) {
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if (setbindhost(&ai_tcp6, bindhost[i], hints) == 0) {
rpcbreg = 1;
rpcbregcnt++;
if ((tcp6sock = socket(ai_tcp6->ai_family,
ai_tcp6->ai_socktype,
ai_tcp6->ai_protocol)) < 0) {
syslog(LOG_ERR,
"can't create tcp6 socket");
nfsd_exit(1);
}
if (setsockopt(tcp6sock, SOL_SOCKET,
SO_REUSEADDR,
(char *)&on, sizeof(on)) < 0)
syslog(LOG_ERR,
"setsockopt SO_REUSEADDR: %m");
if (setsockopt(tcp6sock, IPPROTO_IPV6,
IPV6_V6ONLY, &on, sizeof on) < 0) {
syslog(LOG_ERR,
"can't set v6-only binding for tcp6 "
"socket: %m");
nfsd_exit(1);
}
if (bind(tcp6sock, ai_tcp6->ai_addr,
ai_tcp6->ai_addrlen) < 0) {
syslog(LOG_ERR,
"can't bind tcp6 addr %s: %m",
bindhost[i]);
nfsd_exit(1);
}
if (listen(tcp6sock, -1) < 0) {
syslog(LOG_ERR, "listen failed");
nfsd_exit(1);
}
freeaddrinfo(ai_tcp6);
FD_SET(tcp6sock, &sockbits);
FD_SET(tcp6sock, &v6bits);
if (maxsock < tcp6sock)
maxsock = tcp6sock;
connect_type_cnt++;
}
}
if (rpcbreg == 1) {
memset(&hints, 0, sizeof hints);
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp6);
if (ecode != 0) {
syslog(LOG_ERR, "getaddrinfo tcp6: %s",
gai_strerror(ecode));
nfsd_exit(1);
}
nconf_tcp6 = getnetconfigent("tcp6");
if (nconf_tcp6 == NULL)
err(1, "getnetconfigent tcp6 failed");
nb_tcp6.buf = ai_tcp6->ai_addr;
nb_tcp6.len = nb_tcp6.maxlen = ai_tcp6->ai_addrlen;
if (nfs_minvers == NFS_VER2)
if (!rpcb_set(NFS_PROGRAM, 2, nconf_tcp6,
&nb_tcp6))
err(1, "rpcb_set tcp6 failed");
if (nfs_minvers <= NFS_VER3)
if (!rpcb_set(NFS_PROGRAM, 3, nconf_tcp6,
&nb_tcp6))
err(1, "rpcb_set tcp6 failed");
freeaddrinfo(ai_tcp6);
}
}
if (rpcbregcnt == 0) {
syslog(LOG_ERR, "rpcb_set() failed, nothing to do: %m");
nfsd_exit(1);
}
if (tcpflag && connect_type_cnt == 0) {
syslog(LOG_ERR, "tcp connects == 0, nothing to do: %m");
nfsd_exit(1);
}
setproctitle("master");
/*
* We always want a master to have a clean way to to shut nfsd down
* (with unregistration): if the master is killed, it unregisters and
* kills all children. If we run for UDP only (and so do not have to
* loop waiting waiting for accept), we instead make the parent
* a "server" too. start_server will not return.
*/
if (!tcpflag)
start_server(1);
/*
* Loop forever accepting connections and passing the sockets
* into the kernel for the mounts.
*/
for (;;) {
ready = sockbits;
if (connect_type_cnt > 1) {
if (select(maxsock + 1,
&ready, NULL, NULL, NULL) < 1) {
error = errno;
if (error == EINTR)
continue;
syslog(LOG_ERR, "select failed: %m");
nfsd_exit(1);
}
}
for (tcpsock = 0; tcpsock <= maxsock; tcpsock++) {
if (FD_ISSET(tcpsock, &ready)) {
if (FD_ISSET(tcpsock, &v4bits)) {
len = sizeof(inetpeer);
if ((msgsock = accept(tcpsock,
(struct sockaddr *)&inetpeer, &len)) < 0) {
error = errno;
syslog(LOG_ERR, "accept failed: %m");
if (error == ECONNABORTED ||
error == EINTR)
continue;
nfsd_exit(1);
}
memset(inetpeer.sin_zero, 0,
sizeof(inetpeer.sin_zero));
if (setsockopt(msgsock, SOL_SOCKET,
SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0)
syslog(LOG_ERR,
"setsockopt SO_KEEPALIVE: %m");
addsockargs.sock = msgsock;
addsockargs.name = (caddr_t)&inetpeer;
addsockargs.namelen = len;
nfssvc(nfssvc_addsock, &addsockargs);
(void)close(msgsock);
} else if (FD_ISSET(tcpsock, &v6bits)) {
len = sizeof(inet6peer);
if ((msgsock = accept(tcpsock,
(struct sockaddr *)&inet6peer,
&len)) < 0) {
error = errno;
syslog(LOG_ERR,
"accept failed: %m");
if (error == ECONNABORTED ||
error == EINTR)
continue;
nfsd_exit(1);
}
if (setsockopt(msgsock, SOL_SOCKET,
SO_KEEPALIVE, (char *)&on,
sizeof(on)) < 0)
syslog(LOG_ERR, "setsockopt "
"SO_KEEPALIVE: %m");
addsockargs.sock = msgsock;
addsockargs.name = (caddr_t)&inet6peer;
addsockargs.namelen = len;
nfssvc(nfssvc_addsock, &addsockargs);
(void)close(msgsock);
}
}
}
}
}
static int
setbindhost(struct addrinfo **ai, const char *bindhost, struct addrinfo hints)
{
int ecode;
u_int32_t host_addr[4]; /* IPv4 or IPv6 */
const char *hostptr;
if (bindhost == NULL || strcmp("*", bindhost) == 0)
hostptr = NULL;
else
hostptr = bindhost;
if (hostptr != NULL) {
switch (hints.ai_family) {
case AF_INET:
if (inet_pton(AF_INET, hostptr, host_addr) == 1) {
hints.ai_flags = AI_NUMERICHOST;
} else {
if (inet_pton(AF_INET6, hostptr,
host_addr) == 1)
return (1);
}
break;
case AF_INET6:
if (inet_pton(AF_INET6, hostptr, host_addr) == 1) {
hints.ai_flags = AI_NUMERICHOST;
} else {
if (inet_pton(AF_INET, hostptr,
host_addr) == 1)
return (1);
}
break;
default:
break;
}
}
ecode = getaddrinfo(hostptr, "nfs", &hints, ai);
if (ecode != 0) {
syslog(LOG_ERR, "getaddrinfo %s: %s", bindhost,
gai_strerror(ecode));
return (1);
}
return (0);
}
static void
set_nfsdcnt(int proposed)
{
if (proposed < 1) {
warnx("nfsd count too low %d; reset to %d", proposed,
DEFNFSDCNT);
nfsdcnt = DEFNFSDCNT;
} else if (proposed > MAXNFSDCNT) {
warnx("nfsd count too high %d; truncated to %d", proposed,
MAXNFSDCNT);
nfsdcnt = MAXNFSDCNT;
} else
nfsdcnt = proposed;
nfsdcnt_set = 1;
}
static void
usage(void)
{
(void)fprintf(stderr, "%s", getopt_usage);
exit(1);
}
static void
nonfs(__unused int signo)
{
syslog(LOG_ERR, "missing system call: NFS not available");
}
static void
reapchild(__unused int signo)
{
pid_t pid;
int i;
while ((pid = wait3(NULL, WNOHANG, NULL)) > 0) {
for (i = 0; i < nfsdcnt; i++)
if (pid == children[i])
children[i] = -1;
}
}
static void
unregistration(void)
{
if ((!rpcb_unset(NFS_PROGRAM, 2, NULL)) ||
(!rpcb_unset(NFS_PROGRAM, 3, NULL)))
syslog(LOG_ERR, "rpcb_unset failed");
}
static void
killchildren(void)
{
int i;
for (i = 0; i < nfsdcnt; i++) {
if (children[i] > 0)
kill(children[i], SIGKILL);
}
}
/*
* Cleanup master after SIGUSR1.
*/
static void
cleanup(__unused int signo)
{
nfsd_exit(0);
}
/*
* Cleanup child after SIGUSR1.
*/
static void
child_cleanup(__unused int signo)
{
exit(0);
}
static void
nfsd_exit(int status)
{
killchildren();
unregistration();
exit(status);
}
static int
get_tuned_nfsdcount(void)
{
int ncpu, error, tuned_nfsdcnt;
size_t ncpu_size;
ncpu_size = sizeof(ncpu);
error = sysctlbyname("hw.ncpu", &ncpu, &ncpu_size, NULL, 0);
if (error) {
warnx("sysctlbyname(hw.ncpu) failed defaulting to %d nfs servers",
DEFNFSDCNT);
tuned_nfsdcnt = DEFNFSDCNT;
} else {
tuned_nfsdcnt = ncpu * 8;
}
return tuned_nfsdcnt;
}
static void
start_server(int master)
{
char principal[MAXHOSTNAMELEN + 5];
struct nfsd_nfsd_args nfsdargs;
int status, error;
char hostname[MAXHOSTNAMELEN + 1], *cp;
struct addrinfo *aip, hints;
status = 0;
gethostname(hostname, sizeof (hostname));
snprintf(principal, sizeof (principal), "nfs@%s", hostname);
if ((cp = strchr(hostname, '.')) == NULL ||
*(cp + 1) == '\0') {
/* If not fully qualified, try getaddrinfo() */
memset((void *)&hints, 0, sizeof (hints));
hints.ai_flags = AI_CANONNAME;
error = getaddrinfo(hostname, NULL, &hints, &aip);
if (error == 0) {
if (aip->ai_canonname != NULL &&
(cp = strchr(aip->ai_canonname, '.')) !=
NULL && *(cp + 1) != '\0')
snprintf(principal, sizeof (principal),
"nfs@%s", aip->ai_canonname);
freeaddrinfo(aip);
}
}
nfsdargs.principal = principal;
if (nfsdcnt_set)
nfsdargs.minthreads = nfsdargs.maxthreads = nfsdcnt;
else {
nfsdargs.minthreads = minthreads_set ? minthreads : get_tuned_nfsdcount();
nfsdargs.maxthreads = maxthreads_set ? maxthreads : nfsdargs.minthreads;
if (nfsdargs.maxthreads < nfsdargs.minthreads)
nfsdargs.maxthreads = nfsdargs.minthreads;
}
error = nfssvc(nfssvc_nfsd, &nfsdargs);
if (error < 0 && errno == EAUTH) {
/*
* This indicates that it could not register the
* rpcsec_gss credentials, usually because the
* gssd daemon isn't running.
* (only the experimental server with nfsv4)
*/
syslog(LOG_ERR, "No gssd, using AUTH_SYS only");
principal[0] = '\0';
error = nfssvc(nfssvc_nfsd, &nfsdargs);
}
if (error < 0) {
syslog(LOG_ERR, "nfssvc: %m");
status = 1;
}
if (master)
nfsd_exit(status);
else
exit(status);
}
/*
* Open the stable restart file and return the file descriptor for it.
*/
static void
open_stable(int *stable_fdp, int *backup_fdp)
{
int stable_fd, backup_fd = -1, ret;
struct stat st, backup_st;
/* Open and stat the stable restart file. */
stable_fd = open(NFSD_STABLERESTART, O_RDWR, 0);
if (stable_fd < 0)
stable_fd = open(NFSD_STABLERESTART, O_RDWR | O_CREAT, 0600);
if (stable_fd >= 0) {
ret = fstat(stable_fd, &st);
if (ret < 0) {
close(stable_fd);
stable_fd = -1;
}
}
/* Open and stat the backup stable restart file. */
if (stable_fd >= 0) {
backup_fd = open(NFSD_STABLEBACKUP, O_RDWR, 0);
if (backup_fd < 0)
backup_fd = open(NFSD_STABLEBACKUP, O_RDWR | O_CREAT,
0600);
if (backup_fd >= 0) {
ret = fstat(backup_fd, &backup_st);
if (ret < 0) {
close(backup_fd);
backup_fd = -1;
}
}
if (backup_fd < 0) {
close(stable_fd);
stable_fd = -1;
}
}
*stable_fdp = stable_fd;
*backup_fdp = backup_fd;
if (stable_fd < 0)
return;
/* Sync up the 2 files, as required. */
if (st.st_size > 0)
copy_stable(stable_fd, backup_fd);
else if (backup_st.st_size > 0)
copy_stable(backup_fd, stable_fd);
}
/*
* Copy the stable restart file to the backup or vice versa.
*/
static void
copy_stable(int from_fd, int to_fd)
{
int cnt, ret;
static char buf[1024];
ret = lseek(from_fd, (off_t)0, SEEK_SET);
if (ret >= 0)
ret = lseek(to_fd, (off_t)0, SEEK_SET);
if (ret >= 0)
ret = ftruncate(to_fd, (off_t)0);
if (ret >= 0)
do {
cnt = read(from_fd, buf, 1024);
if (cnt > 0)
ret = write(to_fd, buf, cnt);
else if (cnt < 0)
ret = cnt;
} while (cnt > 0 && ret >= 0);
if (ret >= 0)
ret = fsync(to_fd);
if (ret < 0)
syslog(LOG_ERR, "stable restart copy failure: %m");
}
/*
* Back up the stable restart file when indicated by the kernel.
*/
static void
backup_stable(__unused int signo)
{
if (stablefd >= 0)
copy_stable(stablefd, backupfd);
}
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