usr.sbin/yppush/yppush_main.c

   1 /*
   2  * Copyright (c) 1995
   3  *      Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Bill Paul.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/usr.sbin/yppush/yppush_main.c,v 1.22 2006/08/16 12:58:41 thomas Exp $
  33  */
  34
  35 #include <errno.h>
  36 #include <signal.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <strings.h>
  41 #include <time.h>
  42 #include <unistd.h>
  43 #include <sys/socket.h>
  44 #include <sys/fcntl.h>
  45 #include <sys/wait.h>
  46 #include <sys/param.h>
  47 #include <rpc/rpc.h>
  48 #include <rpc/clnt.h>
  49 #include <rpc/pmap_clnt.h>
  50 #include <rpcsvc/yp.h>
  51 #include <rpcsvc/ypclnt.h>
  52 #include "ypxfr_extern.h"
  53 #include "yppush_extern.h"
  54
  55 char *progname = "yppush";
  56 int debug = 1;
  57 int _rpcpmstart = 0;
  58 const char *yp_dir = _PATH_YP;
  59
  60 char *yppush_mapname = NULL;    /* Map to transfer. */
  61 char *yppush_domain = NULL;     /* Domain in which map resides. */
  62 char *yppush_master = NULL;     /* Master NIS server for said domain. */
  63 int skip_master = 0;            /* Do not attempt to push map to master. */
  64 int verbose = 0;                /* Toggle verbose mode. */
  65 unsigned long yppush_transid = 0;
  66 int yppush_timeout = 80;        /* Default timeout. */
  67 int yppush_jobs = 1;            /* Number of allowed concurrent jobs. */
  68 int yppush_running_jobs = 0;    /* Number of currently running jobs. */
  69
  70 /* Structure for holding information about a running job. */
  71 struct jobs {
  72         unsigned long tid;
  73         int port;
  74         ypxfrstat stat;
  75         unsigned long prognum;
  76         char *server;
  77         char *map;
  78         int polled;
  79         struct jobs *next;
  80 };
  81
  82 struct jobs *yppush_joblist;    /* Linked list of running jobs. */
  83
  84 static int yppush_svc_run(int);
  85
  86 /*
  87  * Local error messages.
  88  */
  89 static const char *
  90 yppusherr_string(int err)
  91 {
  92         switch (err) {
  93         case YPPUSH_TIMEDOUT:
  94                 return("transfer or callback timed out");
  95         case YPPUSH_YPSERV:
  96                 return("failed to contact ypserv");
  97         case YPPUSH_NOHOST:
  98                 return("no such host");
  99         case YPPUSH_PMAP:
 100                 return("portmapper failure");
 101         default:
 102                 return("unknown error code");
 103         }
 104 }
 105
 106 /*
 107  * Report state of a job.
 108  */
 109 static int
 110 yppush_show_status(ypxfrstat status, unsigned long tid)
 111 {
 112         struct jobs *job;
 113
 114         job = yppush_joblist;
 115
 116         while (job != NULL) {
 117                 if (job->tid == tid)
 118                         break;
 119                 job = job->next;
 120         }
 121
 122         if (job == NULL) {
 123                 yp_error("warning: received callback with invalid transaction ID: %lu",
 124                          tid);
 125                 return (0);
 126         }
 127
 128         if (job->polled) {
 129                 yp_error("warning: received callback with duplicate transaction ID: %lu",
 130                          tid);
 131                 return (0);
 132         }
 133
 134         if (verbose > 1) {
 135                 yp_error("checking return status: transaction ID: %lu",
 136                                                                 job->tid);
 137         }
 138
 139         if (status != YPXFR_SUCC || verbose) {
 140                 yp_error("transfer of map %s to server %s %s",
 141                         job->map, job->server, status == YPXFR_SUCC ?
 142                         "succeeded" : "failed");
 143                 yp_error("status returned by ypxfr: %s", status > YPXFR_AGE ?
 144                         yppusherr_string(status) :
 145                         ypxfrerr_string(status));
 146         }
 147
 148         job->polled = 1;
 149
 150         svc_unregister(job->prognum, 1);
 151
 152         yppush_running_jobs--;
 153         return(0);
 154 }
 155
 156 /* Exit routine. */
 157 static void
 158 yppush_exit(int now)
 159 {
 160         struct jobs *jptr;
 161         int still_pending = 1;
 162
 163         /* Let all the information trickle in. */
 164         while (!now && still_pending) {
 165                 jptr = yppush_joblist;
 166                 still_pending = 0;
 167                 while (jptr) {
 168                         if (jptr->polled == 0) {
 169                                 still_pending++;
 170                                 if (verbose > 1)
 171                                         yp_error("%s has not responded",
 172                                                   jptr->server);
 173                         } else {
 174                                 if (verbose > 1)
 175                                         yp_error("%s has responded",
 176                                                   jptr->server);
 177                         }
 178                         jptr = jptr->next;
 179                 }
 180                 if (still_pending) {
 181                         if (verbose > 1)
 182                                 yp_error("%d transfer%sstill pending",
 183                                         still_pending,
 184                                         still_pending > 1 ? "s " : " ");
 185                         if (yppush_svc_run (YPPUSH_RESPONSE_TIMEOUT) == 0) {
 186                                 yp_error("timed out");
 187                                 now = 1;
 188                         }
 189                 } else {
 190                         if (verbose)
 191                                 yp_error("all transfers complete");
 192                         break;
 193                 }
 194         }
 195
 196
 197         /* All stats collected and reported -- kill all the stragglers. */
 198         jptr = yppush_joblist;
 199         while (jptr) {
 200                 if (!jptr->polled)
 201                         yp_error("warning: exiting with transfer \
 202 to %s (transid = %lu) still pending", jptr->server, jptr->tid);
 203                 svc_unregister(jptr->prognum, 1);
 204                 jptr = jptr->next;
 205         }
 206
 207         exit(0);
 208 }
 209
 210 /*
 211  * Handler for 'normal' signals.
 212  */
 213
 214 static void
 215 handler(int sig)
 216 {
 217         yppush_exit (1);
 218         return;
 219 }
 220
 221 /*
 222  * Dispatch loop for callback RPC services.
 223  * Return value:
 224  *   -1 error
 225  *    0 timeout
 226  *   >0 request serviced
 227  */
 228 static int
 229 yppush_svc_run(int timeout_secs)
 230 {
 231         int rc;
 232         fd_set readfds;
 233         struct timeval timeout;
 234
 235         timeout.tv_usec = 0;
 236         timeout.tv_sec = timeout_secs;
 237
 238 retry:
 239         readfds = svc_fdset;
 240         rc = select(svc_maxfd + 1, &readfds, NULL, NULL, &timeout);
 241         switch (rc) {
 242         case -1:
 243                 if (errno == EINTR)
 244                         goto retry;
 245                 yp_error("select failed: %s", strerror(errno));
 246                 break;
 247         case 0:
 248                 yp_error("select() timed out");
 249                 break;
 250         default:
 251                 svc_getreqset(&readfds);
 252                 break;
 253         }
 254         return rc;
 255 }
 256
 257 /*
 258  * RPC service routines for callbacks.
 259  */
 260 void *
 261 yppushproc_null_1_svc(void *argp, struct svc_req *rqstp)
 262 {
 263         static char * result;
 264         /* Do nothing -- RPC conventions call for all a null proc. */
 265         return((void *) &result);
 266 }
 267
 268 void *
 269 yppushproc_xfrresp_1_svc(yppushresp_xfr *argp, struct svc_req *rqstp)
 270 {
 271         static char * result;
 272         yppush_show_status(argp->status, argp->transid);
 273         return((void *) &result);
 274 }
 275
 276 /*
 277  * Transmit a YPPROC_XFR request to ypserv.
 278  */
 279 static int
 280 yppush_send_xfr(struct jobs *job)
 281 {
 282         ypreq_xfr req;
 283 /*      ypresp_xfr *resp; */
 284         DBT key, data;
 285         CLIENT *clnt;
 286         struct rpc_err err;
 287         struct timeval timeout;
 288
 289         timeout.tv_usec = 0;
 290         timeout.tv_sec = 0;
 291
 292         /*
 293          * The ypreq_xfr structure has a member of type map_parms,
 294          * which seems to require the order number of the map.
 295          * It isn't actually used at the other end (at least the
 296          * FreeBSD ypserv doesn't use it) but we fill it in here
 297          * for the sake of completeness.
 298          */
 299         key.data = "YP_LAST_MODIFIED";
 300         key.size = sizeof ("YP_LAST_MODIFIED") - 1;
 301
 302         if (yp_get_record(yppush_domain, yppush_mapname, &key, &data,
 303                           1) != YP_TRUE) {
 304                 yp_error("failed to read order number from %s: %s: %s",
 305                           yppush_mapname, yperr_string(yp_errno),
 306                           strerror(errno));
 307                 return(1);
 308         }
 309
 310         /* Fill in the request arguments */
 311         req.map_parms.ordernum = atoi(data.data);
 312         req.map_parms.domain = yppush_domain;
 313         req.map_parms.peer = yppush_master;
 314         req.map_parms.map = job->map;
 315         req.transid = job->tid;
 316         req.prog = job->prognum;
 317         req.port = job->port;
 318
 319         /* Get a handle to the remote ypserv. */
 320         if ((clnt = clnt_create(job->server, YPPROG, YPVERS, "udp")) == NULL) {
 321                 yp_error("%s: %s",job->server,clnt_spcreateerror("couldn't \
 322 create udp handle to NIS server"));
 323                 switch (rpc_createerr.cf_stat) {
 324                         case RPC_UNKNOWNHOST:
 325                                 job->stat = YPPUSH_NOHOST;
 326                                 break;
 327                         case RPC_PMAPFAILURE:
 328                                 job->stat = YPPUSH_PMAP;
 329                                 break;
 330                         default:
 331                                 job->stat = YPPUSH_RPC;
 332                                 break;
 333                         }
 334                 return(1);
 335         }
 336
 337         /*
 338          * Reduce timeout to nothing since we may not
 339          * get a response from ypserv and we don't want to block.
 340          */
 341         if (clnt_control(clnt, CLSET_TIMEOUT, (char *)&timeout) == FALSE)
 342                 yp_error("failed to set timeout on ypproc_xfr call");
 343
 344         /* Invoke the ypproc_xfr service. */
 345         if (ypproc_xfr_2(&req, clnt) == NULL) {
 346                 clnt_geterr(clnt, &err);
 347                 if (err.re_status != RPC_SUCCESS &&
 348                     err.re_status != RPC_TIMEDOUT) {
 349                         yp_error("%s: %s", job->server, clnt_sperror(clnt,
 350                                                         "yp_xfr failed"));
 351                         job->stat = YPPUSH_YPSERV;
 352                         clnt_destroy(clnt);
 353                         return(1);
 354                 }
 355         }
 356
 357         clnt_destroy(clnt);
 358
 359         return(0);
 360 }
 361
 362 /*
 363  * Main driver function. Register the callback service, add the transfer
 364  * request to the internal list, send the YPPROC_XFR request to ypserv
 365  * do other magic things.
 366  */
 367 static int
 368 yp_push(char *server, char *map, unsigned long tid)
 369 {
 370         unsigned long prognum;
 371         int sock = RPC_ANYSOCK;
 372         SVCXPRT *xprt;
 373         struct jobs *job;
 374
 375         /* Register the job in our linked list of jobs. */
 376
 377         /* First allocate job structure */
 378         if ((job = (struct jobs *)malloc(sizeof (struct jobs))) == NULL) {
 379                 yp_error("malloc failed");
 380                 yppush_exit (1);
 381         }
 382
 383         /*
 384          * Register the callback service on the first free transient
 385          * program number.
 386          */
 387         xprt = svcudp_create(sock);
 388         for (prognum = 0x40000000; prognum < 0x5FFFFFFF; prognum++) {
 389                 if (svc_register(xprt, prognum, 1,
 390                     yppush_xfrrespprog_1, IPPROTO_UDP) == TRUE)
 391                         break;
 392         }
 393         if (prognum == 0x5FFFFFFF) {
 394                 yp_error ("can't register yppush_xfrrespprog_1");
 395                 yppush_exit (1);
 396         }
 397
 398         /* Initialize the info for this job. */
 399         job->stat = 0;
 400         job->tid = tid;
 401         job->port = xprt->xp_port;
 402         job->server = strdup(server);
 403         job->map = strdup(map);
 404         job->prognum = prognum;
 405         job->polled = 0;
 406         job->next = yppush_joblist;
 407         yppush_joblist = job;
 408
 409         if (verbose) {
 410                 yp_error("initiating transfer: %s -> %s (transid = %lu)",
 411                         yppush_mapname, server, tid);
 412         }
 413
 414         /*
 415          * Send the XFR request to ypserv. We don't have to wait for
 416          * a response here since we handle them asynchronously.
 417          */
 418
 419         if (yppush_send_xfr(job)){
 420                 /* Transfer request blew up. */
 421                 yppush_show_status(job->stat ? job->stat :
 422                         YPPUSH_YPSERV,job->tid);
 423         } else {
 424                 if (verbose > 1)
 425                         yp_error("%s has been called", server);
 426         }
 427
 428         return(0);
 429 }
 430
 431 /*
 432  * Called for each entry in the ypservers map from yp_get_map(), which
 433  * is our private yp_all() routine.
 434  */
 435 static int
 436 yppush_foreach(int status, char *key, int keylen, char *val, int vallen,
 437                char *data)
 438 {
 439         char server[YPMAXRECORD + 2];
 440
 441         if (status != YP_TRUE)
 442                 return (status);
 443
 444         snprintf(server, sizeof(server), "%.*s", vallen, val);
 445         if (skip_master && strcasecmp(server, yppush_master) == 0)
 446                 return (0);
 447
 448         /*
 449          * Restrict the number of concurrent jobs: if yppush_jobs number
 450          * of jobs have already been dispatched and are still pending,
 451          * wait for one of them to finish so we can reuse its slot.
 452          */
 453         while (yppush_running_jobs >= yppush_jobs && (yppush_svc_run (yppush_timeout) > 0))
 454                 ;
 455
 456         /* Cleared for takeoff: set everything in motion. */
 457         if (yp_push(server, yppush_mapname, yppush_transid))
 458                 return(yp_errno);
 459
 460         /* Bump the job counter and transaction ID. */
 461         yppush_running_jobs++;
 462         yppush_transid++;
 463         return (0);
 464 }
 465
 466 static void
 467 usage(void)
 468 {
 469         fprintf (stderr, "%s\n%s\n",
 470         "usage: yppush [-d domain] [-t timeout] [-j #parallel jobs] [-h host]",
 471         "              [-p path] mapname");
 472         exit(1);
 473 }
 474
 475 /*
 476  * Entry point. (About time!)
 477  */
 478 int
 479 main(int argc, char *argv[])
 480 {
 481         int ch;
 482         DBT key, data;
 483         char myname[MAXHOSTNAMELEN];
 484         struct hostlist {
 485                 char *name;
 486                 struct hostlist *next;
 487         };
 488         struct hostlist *yppush_hostlist = NULL;
 489         struct hostlist *tmp;
 490
 491         while ((ch = getopt(argc, argv, "d:j:p:h:t:v")) != -1) {
 492                 switch (ch) {
 493                 case 'd':
 494                         yppush_domain = optarg;
 495                         break;
 496                 case 'j':
 497                         yppush_jobs = atoi(optarg);
 498                         if (yppush_jobs <= 0)
 499                                 yppush_jobs = 1;
 500                         break;
 501                 case 'p':
 502                         yp_dir = optarg;
 503                         break;
 504                 case 'h': /* we can handle multiple hosts */
 505                         if ((tmp = (struct hostlist *)malloc(sizeof(struct hostlist))) == NULL) {
 506                                 yp_error("malloc failed");
 507                                 yppush_exit(1);
 508                         }
 509                         tmp->name = strdup(optarg);
 510                         tmp->next = yppush_hostlist;
 511                         yppush_hostlist = tmp;
 512                         break;
 513                 case 't':
 514                         yppush_timeout = atoi(optarg);
 515                         break;
 516                 case 'v':
 517                         verbose++;
 518                         break;
 519                 default:
 520                         usage();
 521                         break;
 522                 }
 523         }
 524
 525         argc -= optind;
 526         argv += optind;
 527
 528         yppush_mapname = argv[0];
 529
 530         if (yppush_mapname == NULL) {
 531         /* "No guts, no glory." */
 532                 usage();
 533         }
 534
 535         /*
 536          * If no domain was specified, try to find the default
 537          * domain. If we can't find that, we're doomed and must bail.
 538          */
 539         if (yppush_domain == NULL) {
 540                 char *yppush_check_domain;
 541                 if (!yp_get_default_domain(&yppush_check_domain) &&
 542                         !_yp_check(&yppush_check_domain)) {
 543                         yp_error("no domain specified and NIS not running");
 544                         usage();
 545                 } else
 546                         yp_get_default_domain(&yppush_domain);
 547         }
 548
 549         /* Check to see that we are the master for this map. */
 550
 551         if (gethostname ((char *)&myname, sizeof(myname))) {
 552                 yp_error("failed to get name of local host: %s",
 553                         strerror(errno));
 554                 yppush_exit(1);
 555         }
 556
 557         key.data = "YP_MASTER_NAME";
 558         key.size = sizeof("YP_MASTER_NAME") - 1;
 559
 560         if (yp_get_record(yppush_domain, yppush_mapname,
 561                           &key, &data, 1) != YP_TRUE) {
 562                 yp_error("couldn't open %s map: %s", yppush_mapname,
 563                          strerror(errno));
 564                 yppush_exit(1);
 565         }
 566
 567         if (strncasecmp(myname, data.data, data.size) == 0) {
 568                 /* I am master server, and no explicit host list was
 569                    specified: do not push map to myself -- this will
 570                    fail with YPPUSH_AGE anyway. */
 571                 if (yppush_hostlist == NULL)
 572                         skip_master = 1;
 573         } else {
 574                 yp_error("warning: this host is not the master for %s",
 575                                                         yppush_mapname);
 576 #ifdef NITPICKY
 577                 yppush_exit(1);
 578 #endif
 579         }
 580
 581         yppush_master = malloc(data.size + 1);
 582         strncpy(yppush_master, data.data, data.size);
 583         yppush_master[data.size] = '\0';
 584
 585         /* Install some handy handlers. */
 586         signal(SIGTERM, handler);
 587         signal(SIGINT, handler);
 588
 589         /* set initial transaction ID */
 590         yppush_transid = time(NULL);
 591
 592         if (yppush_hostlist) {
 593         /*
 594          * Host list was specified on the command line:
 595          * kick off the transfers by hand.
 596          */
 597                 tmp = yppush_hostlist;
 598                 while (tmp) {
 599                         yppush_foreach(YP_TRUE, NULL, 0, tmp->name,
 600                             strlen(tmp->name), NULL);
 601                         tmp = tmp->next;
 602                 }
 603         } else {
 604         /*
 605          * Do a yp_all() on the ypservers map and initiate a ypxfr
 606          * for each one.
 607          */
 608                 ypxfr_get_map("ypservers", yppush_domain,
 609                               "localhost", yppush_foreach);
 610         }
 611
 612         if (verbose > 1)
 613                 yp_error("all jobs dispatched");
 614
 615         /* All done -- normal exit. */
 616         yppush_exit(0);
 617
 618         /* Just in case. */
 619         exit(0);
 620 }