/*-
* Copyright (c) 2009 Rick Macklem, University of Guelph
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/stat.h>
#include <sys/ucred.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <sys/wait.h>
#include <nfs/nfssvc.h>
#include <rpc/rpc.h>
#include <fs/nfs/rpcv2.h>
#include <fs/nfs/nfsproto.h>
#include <fs/nfs/nfskpiport.h>
#include <fs/nfs/nfs.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
/* Global defs */
#ifdef DEBUG
#define syslog(e, s) fprintf(stderr,(s))
static int debug = 1;
#else
static int debug = 0;
#endif
static pid_t children;
static void nonfs(int);
static void reapchild(int);
static void usage(void);
static void cleanup(int);
static void child_cleanup(int);
static void nfscbd_exit(int);
static void killchildren(void);
/*
* Nfs callback server daemon.
*
* 1 - do file descriptor and signal cleanup
* 2 - fork the nfscbd(s)
* 4 - create callback server socket(s)
* 5 - set up server socket for rpc
*
* 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().
*/
int
main(int argc, char *argv[])
{
struct nfscbd_args nfscbdargs;
struct nfsd_nfscbd_args nfscbdargs2;
struct sockaddr_in inetaddr, inetpeer;
fd_set ready, sockbits;
int ch, connect_type_cnt, maxsock, msgsock, error;
int nfssvc_flag, on, sock, tcpsock, ret, mustfreeai = 0;
char *cp, princname[128];
char myname[MAXHOSTNAMELEN], *myfqdnname = NULL;
struct addrinfo *aip, hints;
pid_t pid;
short myport = NFSV4_CBPORT;
socklen_t len;
if (modfind("nfscl") < 0) {
/* Not present in kernel, try loading it */
if (kldload("nfscl") < 0 ||
modfind("nfscl") < 0)
errx(1, "nfscl is not available");
}
/*
* First, get our fully qualified host name, if possible.
*/
if (gethostname(myname, MAXHOSTNAMELEN) >= 0) {
cp = strchr(myname, '.');
if (cp != NULL && *(cp + 1) != '\0') {
cp = myname;
} else {
/*
* No domain on myname, so try looking it up.
*/
cp = NULL;
memset((void *)&hints, 0, sizeof (hints));
hints.ai_flags = AI_CANONNAME;
error = getaddrinfo(myname, NULL, &hints, &aip);
if (error == 0) {
if (aip->ai_canonname != NULL &&
(cp = strchr(aip->ai_canonname, '.')) != NULL
&& *(cp + 1) != '\0') {
cp = aip->ai_canonname;
mustfreeai = 1;
} else {
freeaddrinfo(aip);
}
}
}
if (cp == NULL)
warnx("Can't get fully qualified host name");
myfqdnname = cp;
}
princname[0] = '\0';
#define GETOPT "p:P:"
#define USAGE "[ -p port_num ] [ -P client_principal ]"
while ((ch = getopt(argc, argv, GETOPT)) != -1)
switch (ch) {
case 'p':
myport = atoi(optarg);
if (myport < 1) {
warnx("port# non-positive, reset to %d",
NFSV4_CBPORT);
myport = NFSV4_CBPORT;
}
break;
case 'P':
cp = optarg;
if (cp != NULL && strlen(cp) > 0 &&
strlen(cp) < sizeof (princname)) {
if (strchr(cp, '@') == NULL &&
myfqdnname != NULL)
snprintf(princname, sizeof (princname),
"%s@%s", cp, myfqdnname);
else
strlcpy(princname, cp,
sizeof (princname));
} else {
warnx("client princ invalid. ignored\n");
}
break;
default:
case '?':
usage();
}
argv += optind;
argc -= optind;
if (argc > 0)
usage();
if (mustfreeai)
freeaddrinfo(aip);
nfscbdargs2.principal = (const char *)princname;
if (debug == 0) {
daemon(0, 0);
(void)signal(SIGTERM, SIG_IGN);
(void)signal(SIGHUP, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
}
(void)signal(SIGSYS, nonfs);
(void)signal(SIGCHLD, reapchild);
openlog("nfscbd:", LOG_PID, LOG_DAEMON);
pid = fork();
if (pid < 0) {
syslog(LOG_ERR, "fork: %m");
nfscbd_exit(1);
} else if (pid > 0) {
children = pid;
} else {
(void)signal(SIGUSR1, child_cleanup);
setproctitle("server");
nfssvc_flag = NFSSVC_NFSCBD;
if (nfssvc(nfssvc_flag, &nfscbdargs2) < 0) {
syslog(LOG_ERR, "nfssvc: %m");
nfscbd_exit(1);
}
exit(0);
}
(void)signal(SIGUSR1, cleanup);
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
syslog(LOG_ERR, "can't create udp socket");
nfscbd_exit(1);
}
memset(&inetaddr, 0, sizeof inetaddr);
inetaddr.sin_family = AF_INET;
inetaddr.sin_addr.s_addr = INADDR_ANY;
inetaddr.sin_port = htons(myport);
inetaddr.sin_len = sizeof(inetaddr);
ret = bind(sock, (struct sockaddr *)&inetaddr, sizeof(inetaddr));
/* If bind() fails, this is a restart, so just skip UDP. */
if (ret == 0) {
len = sizeof(inetaddr);
if (getsockname(sock, (struct sockaddr *)&inetaddr, &len) < 0){
syslog(LOG_ERR, "can't get bound addr");
nfscbd_exit(1);
}
nfscbdargs.port = ntohs(inetaddr.sin_port);
if (nfscbdargs.port != myport) {
syslog(LOG_ERR, "BAD PORT#");
nfscbd_exit(1);
}
nfscbdargs.sock = sock;
nfscbdargs.name = NULL;
nfscbdargs.namelen = 0;
if (nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs) < 0) {
syslog(LOG_ERR, "can't Add UDP socket");
nfscbd_exit(1);
}
}
(void)close(sock);
/* Now set up the master server socket waiting for tcp connections. */
on = 1;
FD_ZERO(&sockbits);
connect_type_cnt = 0;
if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
syslog(LOG_ERR, "can't create tcp socket");
nfscbd_exit(1);
}
if (setsockopt(tcpsock,
SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0)
syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m");
/* sin_port is already set */
inetaddr.sin_family = AF_INET;
inetaddr.sin_addr.s_addr = INADDR_ANY;
inetaddr.sin_port = htons(myport);
inetaddr.sin_len = sizeof(inetaddr);
if (bind(tcpsock,
(struct sockaddr *)&inetaddr, sizeof (inetaddr)) < 0) {
syslog(LOG_ERR, "can't bind tcp addr");
nfscbd_exit(1);
}
if (listen(tcpsock, 5) < 0) {
syslog(LOG_ERR, "listen failed");
nfscbd_exit(1);
}
FD_SET(tcpsock, &sockbits);
maxsock = tcpsock;
connect_type_cnt++;
setproctitle("master");
/*
* 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");
nfscbd_exit(1);
}
}
if (FD_ISSET(tcpsock, &ready)) {
len = sizeof(inetpeer);
if ((msgsock = accept(tcpsock,
(struct sockaddr *)&inetpeer, &len)) < 0) {
syslog(LOG_ERR, "accept failed: %m");
nfscbd_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");
nfscbdargs.sock = msgsock;
nfscbdargs.name = (caddr_t)&inetpeer;
nfscbdargs.namelen = sizeof(inetpeer);
nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs);
(void)close(msgsock);
}
}
}
static void
usage(void)
{
errx(1, "usage: nfscbd %s", USAGE);
}
static void
nonfs(int signo __unused)
{
syslog(LOG_ERR, "missing system call: NFS not available");
}
static void
reapchild(int signo __unused)
{
pid_t pid;
while ((pid = wait3(NULL, WNOHANG, NULL)) > 0) {
if (pid == children)
children = -1;
}
}
static void
killchildren(void)
{
if (children > 0)
kill(children, SIGKILL);
}
/*
* Cleanup master after SIGUSR1.
*/
static void
cleanup(int signo __unused)
{
nfscbd_exit(0);
}
/*
* Cleanup child after SIGUSR1.
*/
static void
child_cleanup(int signo __unused)
{
exit(0);
}
static void
nfscbd_exit(int status __unused)
{
killchildren();
exit(status);
}
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