FreeBSD-5.3/usr.sbin/yppush/yppush_main.c
/*
* Copyright (c) 1995
* Bill Paul <wpaul@ctr.columbia.edu>. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Bill Paul.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul 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>
__FBSDID("$FreeBSD: src/usr.sbin/yppush/yppush_main.c,v 1.18 2003/05/03 21:06:41 obrien Exp $");
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/fcntl.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <rpc/rpc.h>
#include <rpc/clnt.h>
#include <rpc/pmap_clnt.h>
#include <rpcsvc/yp.h>
struct dom_binding {};
#include <rpcsvc/ypclnt.h>
#include "ypxfr_extern.h"
#include "yppush_extern.h"
char *progname = "yppush";
int debug = 1;
int _rpcpmstart = 0;
char *yp_dir = _PATH_YP;
char *yppush_mapname = NULL; /* Map to transfer. */
char *yppush_domain = NULL; /* Domain in which map resides. */
char *yppush_master = NULL; /* Master NIS server for said domain. */
int verbose = 0; /* Toggle verbose mode. */
unsigned long yppush_transid = 0;
int yppush_timeout = 80; /* Default timeout. */
int yppush_jobs = 0; /* Number of allowed concurrent jobs. */
int yppush_running_jobs = 0; /* Number of currently running jobs. */
int yppush_alarm_tripped = 0;
/* Structure for holding information about a running job. */
struct jobs {
unsigned long tid;
int sock;
int port;
ypxfrstat stat;
unsigned long prognum;
char *server;
char *map;
int polled;
struct jobs *next;
};
struct jobs *yppush_joblist; /* Linked list of running jobs. */
/*
* Local error messages.
*/
static const char *
yppusherr_string(int err)
{
switch (err) {
case YPPUSH_TIMEDOUT:
return("transfer or callback timed out");
case YPPUSH_YPSERV:
return("failed to contact ypserv");
case YPPUSH_NOHOST:
return("no such host");
case YPPUSH_PMAP:
return("portmapper failure");
default:
return("unknown error code");
}
}
/*
* Report state of a job.
*/
static int
yppush_show_status(ypxfrstat status, unsigned long tid)
{
struct jobs *job;
job = yppush_joblist;
while (job) {
if (job->tid == tid)
break;
job = job->next;
}
if (job->polled) {
return(0);
}
if (verbose > 1)
yp_error("checking return status: transaction ID: %lu",
job->tid);
if (status != YPPUSH_SUCC || verbose) {
yp_error("transfer of map %s to server %s %s",
job->map, job->server, status == YPPUSH_SUCC ?
"succeeded" : "failed");
yp_error("status returned by ypxfr: %s", status > YPPUSH_AGE ?
yppusherr_string(status) :
ypxfrerr_string(status));
}
job->polled = 1;
svc_unregister(job->prognum, 1);
yppush_running_jobs--;
return(0);
}
/* Exit routine. */
static void
yppush_exit(int now)
{
struct jobs *jptr;
int still_pending = 1;
/* Let all the information trickle in. */
while (!now && still_pending) {
jptr = yppush_joblist;
still_pending = 0;
while (jptr) {
if (jptr->polled == 0) {
still_pending++;
if (verbose > 1)
yp_error("%s has not responded",
jptr->server);
} else {
if (verbose > 1)
yp_error("%s has responded",
jptr->server);
}
jptr = jptr->next;
}
if (still_pending) {
if (verbose > 1)
yp_error("%d transfer%sstill pending",
still_pending,
still_pending > 1 ? "s " : " ");
yppush_alarm_tripped = 0;
alarm(YPPUSH_RESPONSE_TIMEOUT);
pause();
alarm(0);
if (yppush_alarm_tripped == 1) {
yp_error("timed out");
now = 1;
}
} else {
if (verbose)
yp_error("all transfers complete");
break;
}
}
/* All stats collected and reported -- kill all the stragglers. */
jptr = yppush_joblist;
while (jptr) {
if (!jptr->polled)
yp_error("warning: exiting with transfer \
to %s (transid = %lu) still pending", jptr->server, jptr->tid);
svc_unregister(jptr->prognum, 1);
jptr = jptr->next;
}
exit(0);
}
/*
* Handler for 'normal' signals.
*/
static void
handler(int sig)
{
if (sig == SIGTERM || sig == SIGINT || sig == SIGABRT) {
yppush_jobs = 0;
yppush_exit(1);
}
if (sig == SIGALRM) {
alarm(0);
yppush_alarm_tripped++;
}
return;
}
/*
* Dispatch loop for callback RPC services.
*/
static void
yppush_svc_run(void)
{
#ifdef FD_SETSIZE
fd_set readfds;
#else
int readfds;
#endif /* def FD_SETSIZE */
struct timeval timeout;
timeout.tv_usec = 0;
timeout.tv_sec = 5;
retry:
#ifdef FD_SETSIZE
readfds = svc_fdset;
#else
readfds = svc_fds;
#endif /* def FD_SETSIZE */
switch (select(_rpc_dtablesize(), &readfds, NULL, NULL, &timeout)) {
case -1:
if (errno == EINTR)
goto retry;
yp_error("select failed: %s", strerror(errno));
break;
case 0:
yp_error("select() timed out");
break;
default:
svc_getreqset(&readfds);
break;
}
return;
}
/*
* Special handler for asynchronous socket I/O. We mark the
* sockets of the callback handlers as O_ASYNC and handle SIGIO
* events here, which will occur when the callback handler has
* something interesting to tell us.
*/
static void
async_handler(int sig)
{
yppush_svc_run();
/* reset any pending alarms. */
alarm(0);
yppush_alarm_tripped++;
kill(getpid(), SIGALRM);
return;
}
/*
* RPC service routines for callbacks.
*/
void *
yppushproc_null_1_svc(void *argp, struct svc_req *rqstp)
{
static char * result;
/* Do nothing -- RPC conventions call for all a null proc. */
return((void *) &result);
}
void *
yppushproc_xfrresp_1_svc(yppushresp_xfr *argp, struct svc_req *rqstp)
{
static char * result;
yppush_show_status(argp->status, argp->transid);
return((void *) &result);
}
/*
* Transmit a YPPROC_XFR request to ypserv.
*/
static int
yppush_send_xfr(struct jobs *job)
{
ypreq_xfr req;
/* ypresp_xfr *resp; */
DBT key, data;
CLIENT *clnt;
struct rpc_err err;
struct timeval timeout;
timeout.tv_usec = 0;
timeout.tv_sec = 0;
/*
* The ypreq_xfr structure has a member of type map_parms,
* which seems to require the order number of the map.
* It isn't actually used at the other end (at least the
* FreeBSD ypserv doesn't use it) but we fill it in here
* for the sake of completeness.
*/
key.data = "YP_LAST_MODIFIED";
key.size = sizeof ("YP_LAST_MODIFIED") - 1;
if (yp_get_record(yppush_domain, yppush_mapname, &key, &data,
1) != YP_TRUE) {
yp_error("failed to read order number from %s: %s: %s",
yppush_mapname, yperr_string(yp_errno),
strerror(errno));
return(1);
}
/* Fill in the request arguments */
req.map_parms.ordernum = atoi(data.data);
req.map_parms.domain = yppush_domain;
req.map_parms.peer = yppush_master;
req.map_parms.map = job->map;
req.transid = job->tid;
req.prog = job->prognum;
req.port = job->port;
/* Get a handle to the remote ypserv. */
if ((clnt = clnt_create(job->server, YPPROG, YPVERS, "udp")) == NULL) {
yp_error("%s: %s",job->server,clnt_spcreateerror("couldn't \
create udp handle to NIS server"));
switch (rpc_createerr.cf_stat) {
case RPC_UNKNOWNHOST:
job->stat = YPPUSH_NOHOST;
break;
case RPC_PMAPFAILURE:
job->stat = YPPUSH_PMAP;
break;
default:
job->stat = YPPUSH_RPC;
break;
}
return(1);
}
/*
* Reduce timeout to nothing since we may not
* get a response from ypserv and we don't want to block.
*/
if (clnt_control(clnt, CLSET_TIMEOUT, (char *)&timeout) == FALSE)
yp_error("failed to set timeout on ypproc_xfr call");
/* Invoke the ypproc_xfr service. */
if (ypproc_xfr_2(&req, clnt) == NULL) {
clnt_geterr(clnt, &err);
if (err.re_status != RPC_SUCCESS &&
err.re_status != RPC_TIMEDOUT) {
yp_error("%s: %s", job->server, clnt_sperror(clnt,
"yp_xfr failed"));
job->stat = YPPUSH_YPSERV;
clnt_destroy(clnt);
return(1);
}
}
clnt_destroy(clnt);
return(0);
}
/*
* Main driver function. Register the callback service, add the transfer
* request to the internal list, send the YPPROC_XFR request to ypserv
* do other magic things.
*/
int
yp_push(char *server, char *map, unsigned long tid)
{
unsigned long prognum;
int sock = RPC_ANYSOCK;
SVCXPRT *xprt;
struct jobs *job;
/*
* Register the callback service on the first free
* transient program number.
*/
xprt = svcudp_create(sock);
for (prognum = 0x40000000; prognum < 0x5FFFFFFF; prognum++) {
if (svc_register(xprt, prognum, 1,
yppush_xfrrespprog_1, IPPROTO_UDP) == TRUE)
break;
}
/* Register the job in our linked list of jobs. */
if ((job = (struct jobs *)malloc(sizeof (struct jobs))) == NULL) {
yp_error("malloc failed");
yppush_exit(1);
}
/* Initialize the info for this job. */
job->stat = 0;
job->tid = tid;
job->port = xprt->xp_port;
job->sock = xprt->xp_fd; /*XXX: Evil!! EEEEEEEVIL!!! */
job->server = strdup(server);
job->map = strdup(map);
job->prognum = prognum;
job->polled = 0;
job->next = yppush_joblist;
yppush_joblist = job;
/*
* Set the RPC sockets to asynchronous mode. This will
* cause the system to smack us with a SIGIO when an RPC
* callback is delivered. This in turn allows us to handle
* the callback even though we may be in the middle of doing
* something else at the time.
*
* XXX This is a horrible thing to do for two reasons,
* both of which have to do with portability:
* 1) We really ought not to be sticking our grubby mits
* into the RPC service transport handle like this.
* 2) Even in this day and age, there are still some *NIXes
* that don't support async socket I/O.
*/
if (fcntl(xprt->xp_fd, F_SETOWN, getpid()) == -1 ||
fcntl(xprt->xp_fd, F_SETFL, O_ASYNC) == -1) {
yp_error("failed to set async I/O mode: %s",
strerror(errno));
yppush_exit(1);
}
if (verbose) {
yp_error("initiating transfer: %s -> %s (transid = %lu)",
yppush_mapname, server, tid);
}
/*
* Send the XFR request to ypserv. We don't have to wait for
* a response here since we can handle them asynchronously.
*/
if (yppush_send_xfr(job)){
/* Transfer request blew up. */
yppush_show_status(job->stat ? job->stat :
YPPUSH_YPSERV,job->tid);
} else {
if (verbose > 1)
yp_error("%s has been called", server);
}
return(0);
}
/*
* Called for each entry in the ypservers map from yp_get_map(), which
* is our private yp_all() routine.
*/
int
yppush_foreach(int status, char *key, int keylen, char *val, int vallen,
char *data)
{
char server[YPMAXRECORD + 2];
if (status != YP_TRUE)
return (status);
snprintf(server, sizeof(server), "%.*s", vallen, val);
/*
* Restrict the number of concurrent jobs. If yppush_jobs number
* of jobs have already been dispatched and are still pending,
* wait for one of them to finish so we can reuse its slot.
*/
if (yppush_jobs <= 1) {
yppush_alarm_tripped = 0;
while (!yppush_alarm_tripped && yppush_running_jobs) {
alarm(yppush_timeout);
yppush_alarm_tripped = 0;
pause();
alarm(0);
}
} else {
yppush_alarm_tripped = 0;
while (!yppush_alarm_tripped && yppush_running_jobs >= yppush_jobs) {
alarm(yppush_timeout);
yppush_alarm_tripped = 0;
pause();
alarm(0);
}
}
/* Cleared for takeoff: set everything in motion. */
if (yp_push(server, yppush_mapname, yppush_transid))
return(yp_errno);
/* Bump the job counter and transaction ID. */
yppush_running_jobs++;
yppush_transid++;
return (0);
}
static void usage()
{
fprintf (stderr, "%s\n%s\n",
"usage: yppush [-d domain] [-t timeout] [-j #parallel jobs] [-h host]",
" [-p path] mapname");
exit(1);
}
/*
* Entry point. (About time!)
*/
int
main(int argc, char *argv[])
{
int ch;
DBT key, data;
char myname[MAXHOSTNAMELEN];
struct hostlist {
char *name;
struct hostlist *next;
};
struct hostlist *yppush_hostlist = NULL;
struct hostlist *tmp;
struct sigaction sa;
while ((ch = getopt(argc, argv, "d:j:p:h:t:v")) != -1) {
switch (ch) {
case 'd':
yppush_domain = optarg;
break;
case 'j':
yppush_jobs = atoi(optarg);
if (yppush_jobs <= 0)
yppush_jobs = 1;
break;
case 'p':
yp_dir = optarg;
break;
case 'h': /* we can handle multiple hosts */
if ((tmp = (struct hostlist *)malloc(sizeof(struct hostlist))) == NULL) {
yp_error("malloc failed");
yppush_exit(1);
}
tmp->name = strdup(optarg);
tmp->next = yppush_hostlist;
yppush_hostlist = tmp;
break;
case 't':
yppush_timeout = atoi(optarg);
break;
case 'v':
verbose++;
break;
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
yppush_mapname = argv[0];
if (yppush_mapname == NULL) {
/* "No guts, no glory." */
usage();
}
/*
* If no domain was specified, try to find the default
* domain. If we can't find that, we're doomed and must bail.
*/
if (yppush_domain == NULL) {
char *yppush_check_domain;
if (!yp_get_default_domain(&yppush_check_domain) &&
!_yp_check(&yppush_check_domain)) {
yp_error("no domain specified and NIS not running");
usage();
} else
yp_get_default_domain(&yppush_domain);
}
/* Check to see that we are the master for this map. */
if (gethostname ((char *)&myname, sizeof(myname))) {
yp_error("failed to get name of local host: %s",
strerror(errno));
yppush_exit(1);
}
key.data = "YP_MASTER_NAME";
key.size = sizeof("YP_MASTER_NAME") - 1;
if (yp_get_record(yppush_domain, yppush_mapname,
&key, &data, 1) != YP_TRUE) {
yp_error("couldn't open %s map: %s", yppush_mapname,
strerror(errno));
yppush_exit(1);
}
if (strncmp(myname, data.data, data.size)) {
yp_error("warning: this host is not the master for %s",
yppush_mapname);
#ifdef NITPICKY
yppush_exit(1);
#endif
}
yppush_master = malloc(data.size + 1);
strncpy(yppush_master, data.data, data.size);
yppush_master[data.size] = '\0';
/* Install some handy handlers. */
signal(SIGALRM, handler);
signal(SIGTERM, handler);
signal(SIGINT, handler);
signal(SIGABRT, handler);
/*
* Set up the SIGIO handler. Make sure that some of the
* other signals are blocked while the handler is running so
* select() doesn't get interrupted.
*/
sigemptyset(&sa.sa_mask);
sigaddset(&sa.sa_mask, SIGIO); /* Goes without saying. */
sigaddset(&sa.sa_mask, SIGPIPE);
sigaddset(&sa.sa_mask, SIGCHLD);
sigaddset(&sa.sa_mask, SIGALRM);
sigaddset(&sa.sa_mask, SIGINT);
sa.sa_handler = async_handler;
sa.sa_flags = 0;
sigaction(SIGIO, &sa, NULL);
/* set initial transaction ID */
yppush_transid = time((time_t *)NULL);
if (yppush_hostlist) {
/*
* Host list was specified on the command line:
* kick off the transfers by hand.
*/
tmp = yppush_hostlist;
while (tmp) {
yppush_foreach(YP_TRUE, NULL, 0, tmp->name,
strlen(tmp->name), NULL);
tmp = tmp->next;
}
} else {
/*
* Do a yp_all() on the ypservers map and initiate a ypxfr
* for each one.
*/
ypxfr_get_map("ypservers", yppush_domain,
"localhost", yppush_foreach);
}
if (verbose > 1)
yp_error("all jobs dispatched");
/* All done -- normal exit. */
yppush_exit(0);
/* Just in case. */
exit(0);
}