release/src/router/nfs-utils/utils/statd/statd.c

   1 /*
   2  * Copyright (C) 1995, 1997-1999 Jeffrey A. Uphoff
   3  * Modified by Olaf Kirch, Oct. 1996.
   4  * Modified by H.J. Lu, 1998.
   5  * Modified by L. Hohberger of Mission Critical Linux, 2000.
   6  *
   7  * NSM for Linux.
   8  */
   9
  10 #ifdef HAVE_CONFIG_H
  11 #include <config.h>
  12 #endif
  13
  14 #include <sys/stat.h>
  15 #include <limits.h>
  16 #include <signal.h>
  17 #include <unistd.h>
  18 #include <fcntl.h>
  19 #include <errno.h>
  20 #include <string.h>
  21 #include <getopt.h>
  22 #include <rpc/rpc.h>
  23 #include <rpc/pmap_clnt.h>
  24 #include <rpcmisc.h>
  25 #include <sys/resource.h>
  26 #include <sys/wait.h>
  27 #include <grp.h>
  28 #include "statd.h"
  29 #include "version.h"
  30 #include "nfslib.h"
  31
  32 /* Socket operations */
  33 #include <sys/types.h>
  34 #include <sys/socket.h>
  35
  36 /* Added to enable specification of state directory path at run-time
  37  * j_carlos_gomez@yahoo.com
  38  */
  39
  40 char * DIR_BASE = DEFAULT_DIR_BASE;
  41
  42 char *  SM_DIR = DEFAULT_SM_DIR;
  43 char *  SM_BAK_DIR =  DEFAULT_SM_BAK_DIR;
  44 char *  SM_STAT_PATH = DEFAULT_SM_STAT_PATH;
  45
  46 /* ----- end of state directory path stuff ------- */
  47
  48 int     run_mode = 0;           /* foreground logging mode */
  49
  50 /* LH - I had these local to main, but it seemed silly to have
  51  * two copies of each - one in main(), one static in log.c...
  52  * It also eliminates the 256-char static in log.c */
  53 char *name_p = NULL;
  54 const char *version_p = NULL;
  55
  56 /* PRC: a high-availability callout program can be specified with -H
  57  * When this is done, the program will receive callouts whenever clients
  58  * are added or deleted to the notify list */
  59 char *ha_callout_prog = NULL;
  60
  61 static struct option longopts[] =
  62 {
  63         { "foreground", 0, 0, 'F' },
  64         { "no-syslog", 0, 0, 'd' },
  65         { "help", 0, 0, 'h' },
  66         { "version", 0, 0, 'v' },
  67         { "outgoing-port", 1, 0, 'o' },
  68         { "port", 1, 0, 'p' },
  69         { "name", 1, 0, 'n' },
  70         { "state-directory-path", 1, 0, 'P' },
  71         { "notify-mode", 0, 0, 'N' },
  72         { "ha-callout", 1, 0, 'H' },
  73         { "no-notify", 0, 0, 'L' },
  74         { NULL, 0, 0, 0 }
  75 };
  76
  77 extern void sm_prog_1 (struct svc_req *, register SVCXPRT *);
  78 static void load_state_number(void);
  79
  80 #ifdef SIMULATIONS
  81 extern void simulator (int, char **);
  82 #endif
  83
  84
  85 #ifdef HAVE_TCP_WRAPPER
  86 #include "tcpwrapper.h"
  87
  88 static void
  89 sm_prog_1_wrapper (struct svc_req *rqstp, register SVCXPRT *transp)
  90 {
  91         struct sockaddr_in *sin = nfs_getrpccaller_in(transp);
  92
  93         /* remote host authorization check */
  94         if (sin->sin_family == AF_INET &&
  95             !check_default("statd", sin, rqstp->rq_proc, SM_PROG)) {
  96                 svcerr_auth (transp, AUTH_FAILED);
  97                 return;
  98         }
  99
 100         sm_prog_1 (rqstp, transp);
 101 }
 102
 103 #define sm_prog_1 sm_prog_1_wrapper
 104 #endif
 105
 106 /*
 107  * Signal handler.
 108  */
 109 static void
 110 killer (int sig)
 111 {
 112         note (N_FATAL, "Caught signal %d, un-registering and exiting.", sig);
 113         pmap_unset (SM_PROG, SM_VERS);
 114
 115         exit (0);
 116 }
 117
 118 static void
 119 sigusr (int sig)
 120 {
 121         extern void my_svc_exit (void);
 122         dprintf (N_DEBUG, "Caught signal %d, re-notifying (state %d).", sig,
 123                                                                 MY_STATE);
 124         my_svc_exit();
 125 }
 126
 127 /*
 128  * Startup information.
 129  */
 130 static void log_modes(void)
 131 {
 132         char buf[128];          /* watch stack size... */
 133
 134         /* No flags = no message */
 135         if (!run_mode) return;
 136
 137         memset(buf,0,128);
 138         sprintf(buf,"Flags: ");
 139         if (run_mode & MODE_NODAEMON)
 140                 strcat(buf,"No-Daemon ");
 141         if (run_mode & MODE_LOG_STDERR)
 142                 strcat(buf,"Log-STDERR ");
 143
 144         note(N_WARNING,buf);
 145 }
 146
 147 /*
 148  * Since we do more than standard statd stuff, we might need to
 149  * help the occasional admin.
 150  */
 151 static void
 152 usage(void)
 153 {
 154         fprintf(stderr,"usage: %s [options]\n", name_p);
 155         fprintf(stderr,"      -h, -?, --help       Print this help screen.\n");
 156         fprintf(stderr,"      -F, --foreground     Foreground (no-daemon mode)\n");
 157         fprintf(stderr,"      -d, --no-syslog      Verbose logging to stderr.  Foreground mode only.\n");
 158         fprintf(stderr,"      -p, --port           Port to listen on\n");
 159         fprintf(stderr,"      -o, --outgoing-port  Port for outgoing connections\n");
 160         fprintf(stderr,"      -V, -v, --version    Display version information and exit.\n");
 161         fprintf(stderr,"      -n, --name           Specify a local hostname.\n");
 162         fprintf(stderr,"      -P                   State directory path.\n");
 163         fprintf(stderr,"      -N                   Run in notify only mode.\n");
 164         fprintf(stderr,"      -L, --no-notify      Do not perform any notification.\n");
 165         fprintf(stderr,"      -H                   Specify a high-availability callout program.\n");
 166 }
 167
 168 static const char *pidfile = "/var/run/rpc.statd.pid";
 169
 170 int pidfd = -1;
 171 static void create_pidfile(void)
 172 {
 173         FILE *fp;
 174
 175         unlink(pidfile);
 176         fp = fopen(pidfile, "w");
 177         if (!fp)
 178                 die("Opening %s failed: %s\n",
 179                     pidfile, strerror(errno));
 180         fprintf(fp, "%d\n", getpid());
 181         pidfd = dup(fileno(fp));
 182         if (fclose(fp) < 0)
 183                 note(N_WARNING, "Flushing pid file failed.\n");
 184 }
 185
 186 static void truncate_pidfile(void)
 187 {
 188         if (pidfd >= 0)
 189                 ftruncate(pidfd, 0);
 190 }
 191
 192 static void drop_privs(void)
 193 {
 194         struct stat st;
 195
 196         if (stat(SM_DIR, &st) == -1 &&
 197             stat(DIR_BASE, &st) == -1) {
 198                 st.st_uid = 0;
 199                 st.st_gid = 0;
 200         }
 201
 202         if (st.st_uid == 0) {
 203                 note(N_WARNING, "statd running as root. chown %s to choose different user\n",
 204                     SM_DIR);
 205                 return;
 206         }
 207         /* better chown the pid file before dropping, as if it
 208          * if over nfs we might loose access
 209          */
 210         if (pidfd >= 0)
 211                 fchown(pidfd, st.st_uid, st.st_gid);
 212
 213         setgroups(0, NULL);
 214         if (setgid(st.st_gid) == -1
 215             || setuid(st.st_uid) == -1) {
 216                 note(N_ERROR, "Fail to drop privileges");
 217                 exit(1);
 218         }
 219 }
 220
 221 static void run_sm_notify(int outport)
 222 {
 223         char op[20];
 224         char *av[6];
 225         int ac = 0;
 226
 227         av[ac++] = "/usr/sbin/sm-notify";
 228         if (run_mode & MODE_NODAEMON)
 229                 av[ac++] = "-d";
 230         if (outport) {
 231                 sprintf(op, "-p%d", outport);
 232                 av[ac++] = op;
 233         }
 234         if (run_mode & STATIC_HOSTNAME) {
 235                 av[ac++] = "-v";
 236                 av[ac++] = MY_NAME;
 237         }
 238         av[ac] = NULL;
 239         execv(av[0], av);
 240         fprintf(stderr, "%s: failed to run %s\n", name_p, av[0]);
 241         exit(2);
 242
 243 }
 244 /*
 245  * Entry routine/main loop.
 246  */
 247 int main (int argc, char **argv)
 248 {
 249         extern char *optarg;
 250         int pid;
 251         int arg;
 252         int port = 0, out_port = 0;
 253         struct rlimit rlim;
 254
 255         int pipefds[2] = { -1, -1};
 256         char status;
 257
 258         /* Default: daemon mode, no other options */
 259         run_mode = 0;
 260
 261         /* Set the basename */
 262         if ((name_p = strrchr(argv[0],'/')) != NULL) {
 263                 name_p ++;
 264         } else {
 265                 name_p = argv[0];
 266         }
 267
 268         /* Get the version */
 269         if ((version_p = strrchr(VERSION,' ')) != NULL) {
 270                 version_p++;
 271         } else {
 272                 version_p = VERSION;
 273         }
 274
 275         /* Set hostname */
 276         MY_NAME = NULL;
 277
 278         /* Process command line switches */
 279         while ((arg = getopt_long(argc, argv, "h?vVFNH:dn:p:o:P:L", longopts, NULL)) != EOF) {
 280                 switch (arg) {
 281                 case 'V':       /* Version */
 282                 case 'v':
 283                         printf("%s version %s\n",name_p,version_p);
 284                         exit(0);
 285                 case 'F':       /* Foreground/nodaemon mode */
 286                         run_mode |= MODE_NODAEMON;
 287                         break;
 288                 case 'N':
 289                         run_mode |= MODE_NOTIFY_ONLY;
 290                         break;
 291                 case 'L': /* Listen only */
 292                         run_mode |= MODE_NO_NOTIFY;
 293                         break;
 294                 case 'd':       /* No daemon only - log to stderr */
 295                         run_mode |= MODE_LOG_STDERR;
 296                         break;
 297                 case 'o':
 298                         out_port = atoi(optarg);
 299                         if (out_port < 1 || out_port > 65535) {
 300                                 fprintf(stderr, "%s: bad port number: %s\n",
 301                                         argv[0], optarg);
 302                                 usage();
 303                                 exit(1);
 304                         }
 305                         break;
 306                 case 'p':
 307                         port = atoi(optarg);
 308                         if (port < 1 || port > 65535) {
 309                                 fprintf(stderr, "%s: bad port number: %s\n",
 310                                         argv[0], optarg);
 311                                 usage();
 312                                 exit(1);
 313                         }
 314                         break;
 315                 case 'n':       /* Specify local hostname */
 316                         run_mode |= STATIC_HOSTNAME;
 317                         MY_NAME = xstrdup(optarg);
 318                         break;
 319                 case 'P':
 320
 321                         if ((DIR_BASE = xstrdup(optarg)) == NULL) {
 322                                 fprintf(stderr, "%s: xstrdup(%s) failed!\n",
 323                                         argv[0], optarg);
 324                                 exit(1);
 325                         }
 326
 327                         SM_DIR = xmalloc(strlen(DIR_BASE) + 1 + sizeof("sm"));
 328                         SM_BAK_DIR = xmalloc(strlen(DIR_BASE) + 1 + sizeof("sm.bak"));
 329                         SM_STAT_PATH = xmalloc(strlen(DIR_BASE) + 1 + sizeof("state"));
 330
 331                         if ((SM_DIR == NULL)
 332                             || (SM_BAK_DIR == NULL)
 333                             || (SM_STAT_PATH == NULL)) {
 334
 335                                 fprintf(stderr, "%s: xmalloc() failed!\n",
 336                                         argv[0]);
 337                                 exit(1);
 338                         }
 339                         if (DIR_BASE[strlen(DIR_BASE)-1] == '/') {
 340                                 sprintf(SM_DIR, "%ssm", DIR_BASE );
 341                                 sprintf(SM_BAK_DIR, "%ssm.bak", DIR_BASE );
 342                                 sprintf(SM_STAT_PATH, "%sstate", DIR_BASE );
 343                         } else {
 344                                 sprintf(SM_DIR, "%s/sm", DIR_BASE );
 345                                 sprintf(SM_BAK_DIR, "%s/sm.bak", DIR_BASE );
 346                                 sprintf(SM_STAT_PATH, "%s/state", DIR_BASE );
 347                         }
 348                         break;
 349                 case 'H': /* PRC: specify the ha-callout program */
 350                         if ((ha_callout_prog = xstrdup(optarg)) == NULL) {
 351                                 fprintf(stderr, "%s: xstrdup(%s) failed!\n",
 352                                         argv[0], optarg);
 353                                 exit(1);
 354                         }
 355                         break;
 356                 case '?':       /* heeeeeelllllllpppp? heh */
 357                 case 'h':
 358                         usage();
 359                         exit (0);
 360                 default:        /* oh dear ... heh */
 361                         usage();
 362                         exit(-1);
 363                 }
 364         }
 365
 366         if (port == out_port && port != 0) {
 367                 fprintf(stderr, "Listening and outgoing ports cannot be the same!\n");
 368                 exit(-1);
 369         }
 370
 371         if (run_mode & MODE_NOTIFY_ONLY) {
 372                 fprintf(stderr, "%s: -N deprecated, consider using /usr/sbin/sm-notify directly\n",
 373                         name_p);
 374                 run_sm_notify(out_port);
 375         }
 376
 377
 378         if (!(run_mode & MODE_NODAEMON)) {
 379                 run_mode &= ~MODE_LOG_STDERR;   /* Never log to console in
 380                                                    daemon mode. */
 381         }
 382
 383         if (getrlimit (RLIMIT_NOFILE, &rlim) != 0)
 384                 fprintf(stderr, "%s: getrlimit (RLIMIT_NOFILE) failed: %s\n",
 385                                 argv [0], strerror(errno));
 386         else {
 387                 /* glibc sunrpc code dies if getdtablesize > FD_SETSIZE */
 388                 if (rlim.rlim_cur > FD_SETSIZE) {
 389                         rlim.rlim_cur = FD_SETSIZE;
 390
 391                         if (setrlimit (RLIMIT_NOFILE, &rlim) != 0) {
 392                                 fprintf(stderr, "%s: setrlimit (RLIMIT_NOFILE) failed: %s\n",
 393                                         argv [0], strerror(errno));
 394                         }
 395                 }
 396         }
 397
 398 #ifdef SIMULATIONS
 399         if (argc > 1)
 400                 /* LH - I _really_ need to update simulator... */
 401                 simulator (--argc, ++argv);     /* simulator() does exit() */
 402 #endif
 403
 404         if (!(run_mode & MODE_NODAEMON)) {
 405                 int tempfd;
 406
 407                 if (pipe(pipefds)<0) {
 408                         perror("statd: unable to create pipe");
 409                         exit(1);
 410                 }
 411                 if ((pid = fork ()) < 0) {
 412                         perror ("statd: Could not fork");
 413                         exit (1);
 414                 } else if (pid != 0) {
 415                         /* Parent.
 416                          * Wait for status from child.
 417                          */
 418                         close(pipefds[1]);
 419                         if (read(pipefds[0], &status, 1) != 1)
 420                                 exit(1);
 421                         exit (0);
 422                 }
 423                 /* Child.       */
 424                 close(pipefds[0]);
 425                 setsid ();
 426                 if (chdir (DIR_BASE) == -1) {
 427                         perror("statd: Could not chdir");
 428                         exit(1);
 429                 }
 430
 431                 while (pipefds[1] <= 2) {
 432                         pipefds[1] = dup(pipefds[1]);
 433                         if (pipefds[1]<0) {
 434                                 perror("statd: dup");
 435                                 exit(1);
 436                         }
 437                 }
 438                 tempfd = open("/dev/null", O_RDWR);
 439                 dup2(tempfd, 0);
 440                 dup2(tempfd, 1);
 441                 dup2(tempfd, 2);
 442                 dup2(pipefds[1], 3);
 443                 pipefds[1] = 3;
 444                 closeall(4);
 445         }
 446
 447         /* Child. */
 448
 449         log_init (/*name_p,version_p*/);
 450
 451         log_modes();
 452
 453         signal (SIGHUP, killer);
 454         signal (SIGINT, killer);
 455         signal (SIGTERM, killer);
 456         /* PRC: trap SIGUSR1 to re-read notify list from disk */
 457         signal(SIGUSR1, sigusr);
 458         /* WARNING: the following works on Linux and SysV, but not BSD! */
 459         signal(SIGCHLD, SIG_IGN);
 460         /*
 461          * Ignore SIGPIPE to avoid statd dying when peers close their
 462          * TCP connection while we're trying to reply to them.
 463          */
 464         signal(SIGPIPE, SIG_IGN);
 465
 466         create_pidfile();
 467         atexit(truncate_pidfile);
 468
 469         if (! (run_mode & MODE_NO_NOTIFY))
 470                 switch (pid = fork()) {
 471                 case 0:
 472                         run_sm_notify(out_port);
 473                         break;
 474                 case -1:
 475                         break;
 476                 default:
 477                         waitpid(pid, NULL, 0);
 478                 }
 479
 480         /* Make sure we have a privilege port for calling into the kernel */
 481         if (statd_get_socket() < 0)
 482                 exit(1);
 483
 484         /* If sm-notify didn't take all the state files, load
 485          * state information into our notify-list so we can
 486          * pass on any SM_NOTIFY that arrives
 487          */
 488         load_state();
 489         load_state_number();
 490         pmap_unset (SM_PROG, SM_VERS);
 491
 492         /* this registers both UDP and TCP services */
 493         rpc_init("statd", SM_PROG, SM_VERS, sm_prog_1, port);
 494
 495         /* If we got this far, we have successfully started, so notify parent */
 496         if (pipefds[1] > 0) {
 497                 status = 0;
 498                 write(pipefds[1], &status, 1);
 499                 close(pipefds[1]);
 500                 pipefds[1] = -1;
 501         }
 502
 503         drop_privs();
 504
 505         for (;;) {
 506                 /*
 507                  * Handle incoming requests:  SM_NOTIFY socket requests, as
 508                  * well as callbacks from lockd.
 509                  */
 510                 my_svc_run();   /* I rolled my own, Olaf made it better... */
 511
 512                 /* Only get here when simulating a crash so we should probably
 513                  * start sm-notify running again.  As we have already dropped
 514                  * privileges, this might not work, but I don't think
 515                  * responding to SM_SIMU_CRASH is an important use cases to
 516                  * get perfect.
 517                  */
 518                 if (! (run_mode & MODE_NO_NOTIFY))
 519                         switch (pid = fork()) {
 520                         case 0:
 521                                 run_sm_notify(out_port);
 522                                 break;
 523                         case -1:
 524                                 break;
 525                         default:
 526                                 waitpid(pid, NULL, 0);
 527                         }
 528
 529         }
 530         return 0;
 531 }
 532
 533 static void
 534 load_state_number(void)
 535 {
 536         int fd;
 537
 538         if ((fd = open(SM_STAT_PATH, O_RDONLY)) == -1)
 539                 return;
 540
 541         read(fd, &MY_STATE, sizeof(MY_STATE));
 542         close(fd);
 543         fd = open("/proc/sys/fs/nfs/nsm_local_state",O_WRONLY);
 544         if (fd >= 0) {
 545                 char buf[20];
 546                 snprintf(buf, sizeof(buf), "%d", MY_STATE);
 547                 write(fd, buf, strlen(buf));
 548                 close(fd);
 549         }
 550
 551 }