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freebsd-skq/usr.sbin/nfsd/nfsd.c
Robert Watson 0be1e825d6 Problem: 
When an NFS server is port-scanned nfsd sometimes exits. This has
  happened 3 times the last few weeks.

  Nfsd has been written to exit when accept(2) fails. Unfortunately
  accept can sometimes make a "normal" return with errno ECONNABORTED
  and in this case nfsd exits prematurely.

Solution:

  Check for ECONNABORTED (and also EINTR, since nfsd uses signals)
  and continue.

Submitted by:	Bjoern Groenvall <bg@sics.se>
PR:		61084
2004-01-11 01:29:03 +00:00

851 lines
22 KiB
C
Raw Blame History

/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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/linker.h>
#include <sys/module.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfsserver/nfs.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
/* Global defs */
#ifdef DEBUG
#define syslog(e, s...) fprintf(stderr,s)
int debug = 1;
#else
int debug = 0;
#endif
#define MAXNFSDCNT 20
#define DEFNFSDCNT 4
pid_t children[MAXNFSDCNT]; /* PIDs of children */
int nfsdcnt; /* number of children */
void cleanup(int);
void child_cleanup(int);
void killchildren(void);
void nfsd_exit(int);
void nonfs(int);
void reapchild(int);
int setbindhost(struct addrinfo **ia, const char *bindhost,
struct addrinfo hints);
void start_server(int);
void unregistration(void);
void usage(void);
/*
* 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
* followed by "n" which is the number of nfsds' to fork off
*/
int
main(argc, argv, envp)
int argc;
char *argv[], *envp[];
{
struct nfsd_args nfsdargs;
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, len, maxsock, msgsock;
int on = 1, unregister, reregister, sock;
int tcp6sock, ip6flag, tcpflag, tcpsock;
int udpflag, ecode, s, srvcnt;
int bindhostc, bindanyflag, rpcbreg, rpcbregcnt;
char **bindhost = NULL;
pid_t pid;
if (modfind("nfsserver") < 0) {
/* Not present in kernel, try loading it */
if (kldload("nfsserver") < 0 || modfind("nfsserver") < 0)
errx(1, "NFS server is not available");
}
nfsdcnt = DEFNFSDCNT;
unregister = reregister = tcpflag = maxsock = 0;
bindanyflag = udpflag = connect_type_cnt = bindhostc = 0;
#define GETOPT "ah:n:rdtu"
#define USAGE "[-ardtu] [-n num_servers] [-h bindip]"
while ((ch = getopt(argc, argv, GETOPT)) != -1)
switch (ch) {
case 'a':
bindanyflag = 1;
break;
case 'n':
nfsdcnt = atoi(optarg);
if (nfsdcnt < 1 || nfsdcnt > MAXNFSDCNT) {
warnx("nfsd count %d; reset to %d", nfsdcnt,
DEFNFSDCNT);
nfsdcnt = DEFNFSDCNT;
}
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;
default:
case '?':
usage();
};
if (!tcpflag && !udpflag)
udpflag = 1;
argv += optind;
argc -= optind;
/*
* XXX
* Backward compatibility, trailing number is the count of daemons.
*/
if (argc > 1)
usage();
if (argc == 1) {
nfsdcnt = atoi(argv[0]);
if (nfsdcnt < 1 || nfsdcnt > MAXNFSDCNT) {
warnx("nfsd count %d; reset to %d", nfsdcnt,
DEFNFSDCNT);
nfsdcnt = DEFNFSDCNT;
}
}
ip6flag = 1;
s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if (s == -1) {
if (errno != EPROTONOSUPPORT)
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");
}
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 ((!rpcb_set(RPCPROG_NFS, 2, nconf_udp, &nb_udp)) ||
(!rpcb_set(RPCPROG_NFS, 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 ((!rpcb_set(RPCPROG_NFS, 2, nconf_udp6, &nb_udp6)) ||
(!rpcb_set(RPCPROG_NFS, 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 ((!rpcb_set(RPCPROG_NFS, 2, nconf_tcp, &nb_tcp)) ||
(!rpcb_set(RPCPROG_NFS, 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 ((!rpcb_set(RPCPROG_NFS, 2, nconf_tcp6, &nb_tcp6)) ||
(!rpcb_set(RPCPROG_NFS, 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);
openlog("nfsd", LOG_PID, LOG_DAEMON);
/* If we use UDP only, we start the last server below. */
srvcnt = tcpflag ? nfsdcnt : nfsdcnt - 1;
for (i = 0; i < srvcnt; i++) {
switch ((pid = fork())) {
case -1:
syslog(LOG_ERR, "fork: %m");
nfsd_exit(1);
case 0:
break;
default:
children[i] = pid;
continue;
}
(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);
nfsdargs.sock = sock;
nfsdargs.name = NULL;
nfsdargs.namelen = 0;
if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 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 ((!rpcb_set(RPCPROG_NFS, 2, nconf_udp, &nb_udp)) ||
(!rpcb_set(RPCPROG_NFS, 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);
nfsdargs.sock = sock;
nfsdargs.name = NULL;
nfsdargs.namelen = 0;
if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 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 ((!rpcb_set(RPCPROG_NFS, 2, nconf_udp6, &nb_udp6)) ||
(!rpcb_set(RPCPROG_NFS, 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 tpc 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, 5) < 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 ((!rpcb_set(RPCPROG_NFS, 2, nconf_tcp,
&nb_tcp)) || (!rpcb_set(RPCPROG_NFS, 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, 5) < 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 ((!rpcb_set(RPCPROG_NFS, 2, nconf_tcp6, &nb_tcp6)) ||
(!rpcb_set(RPCPROG_NFS, 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) {
syslog(LOG_ERR, "select failed: %m");
if (errno == EINTR)
continue;
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) {
syslog(LOG_ERR, "accept failed: %m");
if (errno == ECONNABORTED ||
errno == 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");
nfsdargs.sock = msgsock;
nfsdargs.name = (caddr_t)&inetpeer;
nfsdargs.namelen = len;
nfssvc(NFSSVC_ADDSOCK, &nfsdargs);
(void)close(msgsock);
} else if (FD_ISSET(tcpsock, &v6bits)) {
len = sizeof(inet6peer);
if ((msgsock = accept(tcpsock,
(struct sockaddr *)&inet6peer,
&len)) < 0) {
syslog(LOG_ERR,
"accept failed: %m");
if (errno == ECONNABORTED ||
errno == EINTR)
continue;
nfsd_exit(1);
}
if (setsockopt(msgsock, SOL_SOCKET,
SO_KEEPALIVE, (char *)&on,
sizeof(on)) < 0)
syslog(LOG_ERR, "setsockopt "
"SO_KEEPALIVE: %m");
nfsdargs.sock = msgsock;
nfsdargs.name = (caddr_t)&inet6peer;
nfsdargs.namelen = len;
nfssvc(NFSSVC_ADDSOCK, &nfsdargs);
(void)close(msgsock);
}
}
}
}
}
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);
}
void
usage()
{
(void)fprintf(stderr, "usage: nfsd %s\n", USAGE);
exit(1);
}
void
nonfs(signo)
int signo;
{
syslog(LOG_ERR, "missing system call: NFS not available");
}
void
reapchild(signo)
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;
}
}
void
unregistration()
{
if ((!rpcb_unset(RPCPROG_NFS, 2, NULL)) ||
(!rpcb_unset(RPCPROG_NFS, 3, NULL)))
syslog(LOG_ERR, "rpcb_unset failed");
}
void
killchildren()
{
int i;
for (i = 0; i < nfsdcnt; i++) {
if (children[i] > 0)
kill(children[i], SIGKILL);
}
}
/*
* Cleanup master after SIGUSR1.
*/
void
cleanup(signo)
{
nfsd_exit(0);
}
/*
* Cleanup child after SIGUSR1.
*/
void
child_cleanup(signo)
{
exit(0);
}
void
nfsd_exit(int status)
{
killchildren();
unregistration();
exit(status);
}
void
start_server(int master)
{
int status;
status = 0;
if (nfssvc(NFSSVC_NFSD, NULL) < 0) {
syslog(LOG_ERR, "nfssvc: %m");
status = 1;
}
if (master)
nfsd_exit(status);
else
exit(status);
}
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