/* $NetBSD: nfs_start.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */
/*
* Copyright (c) 1997-2014 Erez Zadok
* Copyright (c) 1990 Jan-Simon Pendry
* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry at Imperial College, London.
*
* 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.
*
*
* File: am-utils/amd/nfs_start.c
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>
#ifndef SELECT_MAXWAIT
# define SELECT_MAXWAIT 16
#endif /* not SELECT_MAXWAIT */
SVCXPRT *nfsxprt = NULL;
u_short nfs_port = 0;
#ifndef HAVE_SIGACTION
# define MASKED_SIGS (sigmask(SIGINT)|sigmask(SIGTERM)|sigmask(SIGCHLD)|sigmask(SIGHUP))
#endif /* not HAVE_SIGACTION */
#ifdef DEBUG
/*
* Check that we are not burning resources
*/
static void
checkup(void)
{
static int max_fd = 0;
static char *max_mem = NULL;
int next_fd = dup(0);
caddr_t next_mem = sbrk(0);
close(next_fd);
if (max_fd < next_fd) {
dlog("%d new fds allocated; total is %d",
next_fd - max_fd, next_fd);
max_fd = next_fd;
}
if (max_mem < next_mem) {
#ifdef HAVE_GETPAGESIZE
dlog("%#lx bytes of memory allocated; total is %#lx (%ld pages)",
(long) (next_mem - max_mem), (unsigned long) next_mem,
((long) next_mem + getpagesize() - 1) / (long) getpagesize());
#else /* not HAVE_GETPAGESIZE */
dlog("%#lx bytes of memory allocated; total is %#lx",
(long) (next_mem - max_mem), (unsigned long) next_mem);
#endif /* not HAVE_GETPAGESIZE */
max_mem = next_mem;
}
}
#else /* not DEBUG */
#define checkup()
#endif /* not DEBUG */
static int
#ifdef HAVE_SIGACTION
do_select(sigset_t smask, int fds, fd_set *fdp, struct timeval *tvp)
#else /* not HAVE_SIGACTION */
do_select(int smask, int fds, fd_set *fdp, struct timeval *tvp)
#endif /* not HAVE_SIGACTION */
{
int sig;
int nsel;
if ((sig = setjmp(select_intr))) {
select_intr_valid = 0;
/* Got a signal */
switch (sig) {
case SIGINT:
case SIGTERM:
amd_state = Finishing;
reschedule_timeout_mp();
break;
}
nsel = -1;
errno = EINTR;
} else {
select_intr_valid = 1;
/*
* Allow interrupts. If a signal
* occurs, then it will cause a longjmp
* up above.
*/
#ifdef HAVE_SIGACTION
sigprocmask(SIG_SETMASK, &smask, NULL);
#else /* not HAVE_SIGACTION */
(void) sigsetmask(smask);
#endif /* not HAVE_SIGACTION */
/*
* Wait for input
*/
nsel = select(fds, fdp, (fd_set *) NULL, (fd_set *) NULL,
tvp->tv_sec ? tvp : (struct timeval *) NULL);
}
#ifdef HAVE_SIGACTION
sigprocmask(SIG_BLOCK, &masked_sigs, NULL);
#else /* not HAVE_SIGACTION */
(void) sigblock(MASKED_SIGS);
#endif /* not HAVE_SIGACTION */
/*
* Perhaps reload the cache?
*/
if (do_mapc_reload < clocktime(NULL)) {
mapc_reload();
do_mapc_reload = clocktime(NULL) + gopt.map_reload_interval;
}
return nsel;
}
/*
* Determine whether anything is left in
* the RPC input queue.
*/
static int
rpc_pending_now(void)
{
struct timeval tvv;
int nsel;
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(fwd_sock, &readfds);
tvv.tv_sec = tvv.tv_usec = 0;
nsel = select(FD_SETSIZE, &readfds, (fd_set *) NULL, (fd_set *) NULL, &tvv);
if (nsel < 1)
return (0);
if (FD_ISSET(fwd_sock, &readfds))
return (1);
return (0);
}
static serv_state
run_rpc(void)
{
#ifdef HAVE_SIGACTION
sigset_t smask;
sigprocmask(SIG_BLOCK, &masked_sigs, &smask);
#else /* not HAVE_SIGACTION */
int smask = sigblock(MASKED_SIGS);
#endif /* not HAVE_SIGACTION */
next_softclock = clocktime(NULL);
amd_state = Run;
/*
* Keep on trucking while we are in Run mode. This state
* is switched to Quit after all the file systems have
* been unmounted.
*/
while ((int) amd_state <= (int) Finishing) {
struct timeval tvv;
int nsel;
time_t now;
fd_set readfds;
#ifdef HAVE_SVC_GETREQSET
memmove(&readfds, &svc_fdset, sizeof(svc_fdset));
#else /* not HAVE_SVC_GETREQSET */
FD_ZERO(&readfds);
# ifdef HAVE_FD_SET_FDS_BITS
readfds.fds_bits[0] = svc_fds;
# else /* not HAVE_FD_SET_FDS_BITS */
readfds = svc_fds;
# endif /* not HAVE_FD_SET_FDS_BITS */
#endif /* not HAVE_SVC_GETREQSET */
FD_SET(fwd_sock, &readfds);
checkup();
/*
* If the full timeout code is not called,
* then recompute the time delta manually.
*/
now = clocktime(NULL);
if (next_softclock <= now) {
if (amd_state == Finishing)
umount_exported();
tvv.tv_sec = softclock();
} else {
tvv.tv_sec = next_softclock - now;
}
tvv.tv_usec = 0;
if (amd_state == Finishing && get_exported_ap(0) == NULL) {
flush_mntfs();
amd_state = Quit;
break;
}
#ifdef HAVE_FS_AUTOFS
autofs_add_fdset(&readfds);
#endif /* HAVE_FS_AUTOFS */
if (tvv.tv_sec <= 0)
tvv.tv_sec = SELECT_MAXWAIT;
if (tvv.tv_sec) {
dlog("Select waits for %ds", (int) tvv.tv_sec);
} else {
dlog("Select waits for Godot");
}
nsel = do_select(smask, FD_SETSIZE, &readfds, &tvv);
switch (nsel) {
case -1:
if (errno == EINTR) {
dlog("select interrupted");
continue;
}
plog(XLOG_ERROR, "select: %m");
break;
case 0:
break;
default:
/*
* Read all pending NFS responses at once to avoid having responses
* queue up as a consequence of retransmissions.
*/
if (FD_ISSET(fwd_sock, &readfds)) {
FD_CLR(fwd_sock, &readfds);
--nsel;
do {
fwd_reply();
} while (rpc_pending_now() > 0);
}
#ifdef HAVE_FS_AUTOFS
if (nsel)
nsel = autofs_handle_fdset(&readfds, nsel);
#endif /* HAVE_FS_AUTOFS */
if (nsel) {
/*
* Anything left must be a normal
* RPC request.
*/
#ifdef HAVE_SVC_GETREQSET
svc_getreqset(&readfds);
#else /* not HAVE_SVC_GETREQSET */
# ifdef HAVE_FD_SET_FDS_BITS
svc_getreq(readfds.fds_bits[0]);
# else /* not HAVE_FD_SET_FDS_BITS */
svc_getreq(readfds);
# endif /* not HAVE_FD_SET_FDS_BITS */
#endif /* not HAVE_SVC_GETREQSET */
}
break;
}
}
#ifdef HAVE_SIGACTION
sigprocmask(SIG_SETMASK, &smask, NULL);
#else /* not HAVE_SIGACTION */
(void) sigsetmask(smask);
#endif /* not HAVE_SIGACTION */
if (amd_state == Quit)
amd_state = Done;
return amd_state;
}
int
mount_automounter(int ppid)
{
/*
* Old code replaced by rpc-trash patch.
* Erez Zadok <
[email protected]>
int so = socket(AF_INET, SOCK_DGRAM, 0);
*/
SVCXPRT *udp_amqp = NULL, *tcp_amqp = NULL;
int nmount, ret;
int soNFS;
int udp_soAMQ, tcp_soAMQ;
struct netconfig *udp_amqncp, *tcp_amqncp;
/*
* This must be done first, because it attempts to bind
* to various UDP ports and we don't want anything else
* potentially taking over those ports before we get a chance
* to reserve them.
*/
if (gopt.flags & CFM_RESTART_EXISTING_MOUNTS)
restart_automounter_nodes();
/*
* Start RPC forwarding
*/
if (fwd_init() != 0)
return 3;
/*
* Construct the root automount node
*/
make_root_node();
/*
* Pick up the pieces from a previous run
* This is likely to (indirectly) need the rpc_fwd package
* so it *must* come after the call to fwd_init().
*/
if (gopt.flags & CFM_RESTART_EXISTING_MOUNTS)
restart();
/*
* Create the nfs service for amd
* If nfs_port is already initialized, it means we
* already created the service during restart_automounter_nodes().
*/
if (nfs_port == 0) {
ret = create_nfs_service(&soNFS, &nfs_port, &nfsxprt, nfs_dispatcher,
get_nfs_dispatcher_version(nfs_dispatcher));
if (ret != 0)
return ret;
}
xsnprintf(pid_fsname, sizeof(pid_fsname), "%s:(pid%ld,port%u)",
am_get_hostname(), (long) am_mypid, nfs_port);
/* security: if user sets -D noamq, don't even create listening socket */
if (amuDebug(D_AMQ)) {
ret = create_amq_service(&udp_soAMQ,
&udp_amqp,
&udp_amqncp,
&tcp_soAMQ,
&tcp_amqp,
&tcp_amqncp,
gopt.preferred_amq_port);
if (ret != 0)
return ret;
}
#ifdef HAVE_FS_AUTOFS
if (amd_use_autofs) {
/*
* Create the autofs service for amd.
*/
ret = create_autofs_service();
/* if autofs service fails it is OK if using a test amd */
if (ret != 0) {
plog(XLOG_WARNING, "autofs service registration failed, turning off autofs support");
amd_use_autofs = 0;
}
}
#endif /* HAVE_FS_AUTOFS */
/*
* Mount the top-level auto-mountpoints
*/
nmount = mount_exported();
/*
* Now safe to tell parent that we are up and running
*/
if (ppid)
kill(ppid, SIGQUIT);
if (nmount == 0) {
plog(XLOG_FATAL, "No work to do - quitting");
amd_state = Done;
return 0;
}
if (amuDebug(D_AMQ)) {
/*
* Complete registration of amq (first TCP service then UDP)
*/
int tcp_ok = 0, udp_ok = 0;
unregister_amq(); /* unregister leftover Amd, if any, just in case */
tcp_ok = amu_svc_register(tcp_amqp, get_amd_program_number(), AMQ_VERSION,
amq_program_1, IPPROTO_TCP, tcp_amqncp);
if (!tcp_ok)
plog(XLOG_FATAL,
"unable to register (AMQ_PROGRAM=%lu, AMQ_VERSION, tcp)",
get_amd_program_number());
udp_ok = amu_svc_register(udp_amqp, get_amd_program_number(), AMQ_VERSION,
amq_program_1, IPPROTO_UDP, udp_amqncp);
if (!udp_ok)
plog(XLOG_FATAL,
"unable to register (AMQ_PROGRAM=%lu, AMQ_VERSION, udp)",
get_amd_program_number());
/* return error only if both failed */
if (!tcp_ok && !udp_ok) {
amd_state = Done;
return 3;
}
}
/*
* Start timeout_mp rolling
*/
reschedule_timeout_mp();
/*
* Start the server
*/
if (run_rpc() != Done) {
plog(XLOG_FATAL, "run_rpc failed");
amd_state = Done;
}
return 0;
}
