release/src/router/busybox/runit/sv.c

   1 /*
   2 Copyright (c) 2001-2006, Gerrit Pape
   3 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 are met:
   7
   8    1. Redistributions of source code must retain the above copyright notice,
   9       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. The name of the author may not be used to endorse or promote products
  14       derived from this software without specific prior written permission.
  15
  16 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  17 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  18 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
  19 EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  20 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  22 OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  23 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  25 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26 */
  27
  28 /* Taken from http://smarden.sunsite.dk/runit/sv.8.html:
  29
  30 sv - control and manage services monitored by runsv
  31
  32 sv [-v] [-w sec] command services
  33 /etc/init.d/service [-w sec] command
  34
  35 The sv program reports the current status and controls the state of services
  36 monitored by the runsv(8) supervisor.
  37
  38 services consists of one or more arguments, each argument naming a directory
  39 service used by runsv(8). If service doesn't start with a dot or slash,
  40 it is searched in the default services directory /var/service/, otherwise
  41 relative to the current directory.
  42
  43 command is one of up, down, status, once, pause, cont, hup, alarm, interrupt,
  44 1, 2, term, kill, or exit, or start, stop, restart, shutdown, force-stop,
  45 force-reload, force-restart, force-shutdown.
  46
  47 The sv program can be sym-linked to /etc/init.d/ to provide an LSB init
  48 script interface. The service to be controlled then is specified by the
  49 base name of the "init script".
  50
  51 status
  52     Report the current status of the service, and the appendant log service
  53     if available, to standard output.
  54 up
  55     If the service is not running, start it. If the service stops, restart it.
  56 down
  57     If the service is running, send it the TERM signal, and the CONT signal.
  58     If ./run exits, start ./finish if it exists. After it stops, do not
  59     restart service.
  60 once
  61     If the service is not running, start it. Do not restart it if it stops.
  62 pause cont hup alarm interrupt quit 1 2 term kill
  63     If the service is running, send it the STOP, CONT, HUP, ALRM, INT, QUIT,
  64     USR1, USR2, TERM, or KILL signal respectively.
  65 exit
  66     If the service is running, send it the TERM signal, and the CONT signal.
  67     Do not restart the service. If the service is down, and no log service
  68     exists, runsv(8) exits. If the service is down and a log service exists,
  69     send the TERM signal to the log service. If the log service is down,
  70     runsv(8) exits. This command is ignored if it is given to an appendant
  71     log service.
  72
  73 sv actually looks only at the first character of above commands.
  74
  75 Commands compatible to LSB init script actions:
  76
  77 status
  78     Same as status.
  79 start
  80     Same as up, but wait up to 7 seconds for the command to take effect.
  81     Then report the status or timeout. If the script ./check exists in
  82     the service directory, sv runs this script to check whether the service
  83     is up and available; it's considered to be available if ./check exits
  84     with 0.
  85 stop
  86     Same as down, but wait up to 7 seconds for the service to become down.
  87     Then report the status or timeout.
  88 restart
  89     Send the commands term, cont, and up to the service, and wait up to
  90     7 seconds for the service to restart. Then report the status or timeout.
  91     If the script ./check exists in the service directory, sv runs this script
  92     to check whether the service is up and available again; it's considered
  93     to be available if ./check exits with 0.
  94 shutdown
  95     Same as exit, but wait up to 7 seconds for the runsv(8) process
  96     to terminate. Then report the status or timeout.
  97 force-stop
  98     Same as down, but wait up to 7 seconds for the service to become down.
  99     Then report the status, and on timeout send the service the kill command.
 100 force-reload
 101     Send the service the term and cont commands, and wait up to
 102     7 seconds for the service to restart. Then report the status,
 103     and on timeout send the service the kill command.
 104 force-restart
 105     Send the service the term, cont and up commands, and wait up to
 106     7 seconds for the service to restart. Then report the status, and
 107     on timeout send the service the kill command. If the script ./check
 108     exists in the service directory, sv runs this script to check whether
 109     the service is up and available again; it's considered to be available
 110     if ./check exits with 0.
 111 force-shutdown
 112     Same as exit, but wait up to 7 seconds for the runsv(8) process to
 113     terminate. Then report the status, and on timeout send the service
 114     the kill command.
 115
 116 Additional Commands
 117
 118 check
 119     Check for the service to be in the state that's been requested. Wait up to
 120     7 seconds for the service to reach the requested state, then report
 121     the status or timeout. If the requested state of the service is up,
 122     and the script ./check exists in the service directory, sv runs
 123     this script to check whether the service is up and running;
 124     it's considered to be up if ./check exits with 0.
 125
 126 Options
 127
 128 -v
 129     wait up to 7 seconds for the command to take effect.
 130     Then report the status or timeout.
 131 -w sec
 132     Override the default timeout of 7 seconds with sec seconds. Implies -v.
 133
 134 Environment
 135
 136 SVDIR
 137     The environment variable $SVDIR overrides the default services directory
 138     /var/service.
 139 SVWAIT
 140     The environment variable $SVWAIT overrides the default 7 seconds to wait
 141     for a command to take effect. It is overridden by the -w option.
 142
 143 Exit Codes
 144     sv exits 0, if the command was successfully sent to all services, and,
 145     if it was told to wait, the command has taken effect to all services.
 146
 147     For each service that caused an error (e.g. the directory is not
 148     controlled by a runsv(8) process, or sv timed out while waiting),
 149     sv increases the exit code by one and exits non zero. The maximum
 150     is 99. sv exits 100 on error.
 151 */
 152
 153 /* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
 154 /* TODO: depends on runit_lib.c - review and reduce/eliminate */
 155
 156 #include <sys/poll.h>
 157 #include <sys/file.h>
 158 #include "libbb.h"
 159 #include "runit_lib.h"
 160
 161 struct globals {
 162         const char *acts;
 163         char **service;
 164         unsigned rc;
 165 /* "Bernstein" time format: unix + 0x400000000000000aULL */
 166         uint64_t tstart, tnow;
 167         svstatus_t svstatus;
 168 };
 169 #define G (*(struct globals*)&bb_common_bufsiz1)
 170 #define acts         (G.acts        )
 171 #define service      (G.service     )
 172 #define rc           (G.rc          )
 173 #define tstart       (G.tstart      )
 174 #define tnow         (G.tnow        )
 175 #define svstatus     (G.svstatus    )
 176 #define INIT_G() do { } while (0)
 177
 178
 179 static void fatal_cannot(const char *m1) NORETURN;
 180 static void fatal_cannot(const char *m1)
 181 {
 182         bb_perror_msg("fatal: can't %s", m1);
 183         _exit(151);
 184 }
 185
 186 static void out(const char *p, const char *m1)
 187 {
 188         printf("%s%s: %s", p, *service, m1);
 189         if (errno) {
 190                 printf(": %s", strerror(errno));
 191         }
 192         bb_putchar('\n'); /* will also flush the output */
 193 }
 194
 195 #define WARN    "warning: "
 196 #define OK      "ok: "
 197
 198 static void fail(const char *m1)
 199 {
 200         ++rc;
 201         out("fail: ", m1);
 202 }
 203 static void failx(const char *m1)
 204 {
 205         errno = 0;
 206         fail(m1);
 207 }
 208 static void warn(const char *m1)
 209 {
 210         ++rc;
 211         /* "warning: <service>: <m1>\n" */
 212         out("warning: ", m1);
 213 }
 214 static void ok(const char *m1)
 215 {
 216         errno = 0;
 217         out(OK, m1);
 218 }
 219
 220 static int svstatus_get(void)
 221 {
 222         int fd, r;
 223
 224         fd = open_write("supervise/ok");
 225         if (fd == -1) {
 226                 if (errno == ENODEV) {
 227                         *acts == 'x' ? ok("runsv not running")
 228                                      : failx("runsv not running");
 229                         return 0;
 230                 }
 231                 warn("cannot open supervise/ok");
 232                 return -1;
 233         }
 234         close(fd);
 235         fd = open_read("supervise/status");
 236         if (fd == -1) {
 237                 warn("cannot open supervise/status");
 238                 return -1;
 239         }
 240         r = read(fd, &svstatus, 20);
 241         close(fd);
 242         switch (r) {
 243         case 20:
 244                 break;
 245         case -1:
 246                 warn("cannot read supervise/status");
 247                 return -1;
 248         default:
 249                 errno = 0;
 250                 warn("cannot read supervise/status: bad format");
 251                 return -1;
 252         }
 253         return 1;
 254 }
 255
 256 static unsigned svstatus_print(const char *m)
 257 {
 258         int diff;
 259         int pid;
 260         int normallyup = 0;
 261         struct stat s;
 262         uint64_t timestamp;
 263
 264         if (stat("down", &s) == -1) {
 265                 if (errno != ENOENT) {
 266                         bb_perror_msg(WARN"cannot stat %s/down", *service);
 267                         return 0;
 268                 }
 269                 normallyup = 1;
 270         }
 271         pid = SWAP_LE32(svstatus.pid_le32);
 272         timestamp = SWAP_BE64(svstatus.time_be64);
 273         if (pid) {
 274                 switch (svstatus.run_or_finish) {
 275                 case 1: printf("run: "); break;
 276                 case 2: printf("finish: "); break;
 277                 }
 278                 printf("%s: (pid %d) ", m, pid);
 279         } else {
 280                 printf("down: %s: ", m);
 281         }
 282         diff = tnow - timestamp;
 283         printf("%us", (diff < 0 ? 0 : diff));
 284         if (pid) {
 285                 if (!normallyup) printf(", normally down");
 286                 if (svstatus.paused) printf(", paused");
 287                 if (svstatus.want == 'd') printf(", want down");
 288                 if (svstatus.got_term) printf(", got TERM");
 289         } else {
 290                 if (normallyup) printf(", normally up");
 291                 if (svstatus.want == 'u') printf(", want up");
 292         }
 293         return pid ? 1 : 2;
 294 }
 295
 296 static int status(const char *unused UNUSED_PARAM)
 297 {
 298         int r;
 299
 300         r = svstatus_get();
 301         switch (r) { case -1: case 0: return 0; }
 302
 303         r = svstatus_print(*service);
 304         if (chdir("log") == -1) {
 305                 if (errno != ENOENT) {
 306                         printf("; log: "WARN"cannot change to log service directory: %s",
 307                                         strerror(errno));
 308                 }
 309         } else if (svstatus_get()) {
 310                 printf("; ");
 311                 svstatus_print("log");
 312         }
 313         bb_putchar('\n'); /* will also flush the output */
 314         return r;
 315 }
 316
 317 static int checkscript(void)
 318 {
 319         char *prog[2];
 320         struct stat s;
 321         int pid, w;
 322
 323         if (stat("check", &s) == -1) {
 324                 if (errno == ENOENT) return 1;
 325                 bb_perror_msg(WARN"cannot stat %s/check", *service);
 326                 return 0;
 327         }
 328         /* if (!(s.st_mode & S_IXUSR)) return 1; */
 329         prog[0] = (char*)"./check";
 330         prog[1] = NULL;
 331         pid = spawn(prog);
 332         if (pid <= 0) {
 333                 bb_perror_msg(WARN"cannot %s child %s/check", "run", *service);
 334                 return 0;
 335         }
 336         while (safe_waitpid(pid, &w, 0) == -1) {
 337                 bb_perror_msg(WARN"cannot %s child %s/check", "wait for", *service);
 338                 return 0;
 339         }
 340         return !wait_exitcode(w);
 341 }
 342
 343 static int check(const char *a)
 344 {
 345         int r;
 346         unsigned pid;
 347         uint64_t timestamp;
 348
 349         r = svstatus_get();
 350         if (r == -1)
 351                 return -1;
 352         if (r == 0) {
 353                 if (*a == 'x')
 354                         return 1;
 355                 return -1;
 356         }
 357         pid = SWAP_LE32(svstatus.pid_le32);
 358         switch (*a) {
 359         case 'x':
 360                 return 0;
 361         case 'u':
 362                 if (!pid || svstatus.run_or_finish != 1) return 0;
 363                 if (!checkscript()) return 0;
 364                 break;
 365         case 'd':
 366                 if (pid) return 0;
 367                 break;
 368         case 'c':
 369                 if (pid && !checkscript()) return 0;
 370                 break;
 371         case 't':
 372                 if (!pid && svstatus.want == 'd') break;
 373                 timestamp = SWAP_BE64(svstatus.time_be64);
 374                 if ((tstart > timestamp) || !pid || svstatus.got_term || !checkscript())
 375                         return 0;
 376                 break;
 377         case 'o':
 378                 timestamp = SWAP_BE64(svstatus.time_be64);
 379                 if ((!pid && tstart > timestamp) || (pid && svstatus.want != 'd'))
 380                         return 0;
 381         }
 382         printf(OK);
 383         svstatus_print(*service);
 384         bb_putchar('\n'); /* will also flush the output */
 385         return 1;
 386 }
 387
 388 static int control(const char *a)
 389 {
 390         int fd, r;
 391
 392         if (svstatus_get() <= 0)
 393                 return -1;
 394         if (svstatus.want == *a)
 395                 return 0;
 396         fd = open_write("supervise/control");
 397         if (fd == -1) {
 398                 if (errno != ENODEV)
 399                         warn("cannot open supervise/control");
 400                 else
 401                         *a == 'x' ? ok("runsv not running") : failx("runsv not running");
 402                 return -1;
 403         }
 404         r = write(fd, a, strlen(a));
 405         close(fd);
 406         if (r != strlen(a)) {
 407                 warn("cannot write to supervise/control");
 408                 return -1;
 409         }
 410         return 1;
 411 }
 412
 413 int sv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 414 int sv_main(int argc, char **argv)
 415 {
 416         unsigned opt;
 417         unsigned i, want_exit;
 418         char *x;
 419         char *action;
 420         const char *varservice = CONFIG_SV_DEFAULT_SERVICE_DIR;
 421         unsigned services;
 422         char **servicex;
 423         unsigned waitsec = 7;
 424         smallint kll = 0;
 425         int verbose = 0;
 426         int (*act)(const char*);
 427         int (*cbk)(const char*);
 428         int curdir;
 429
 430         INIT_G();
 431
 432         xfunc_error_retval = 100;
 433
 434         x = getenv("SVDIR");
 435         if (x) varservice = x;
 436         x = getenv("SVWAIT");
 437         if (x) waitsec = xatou(x);
 438
 439         opt_complementary = "w+:vv"; /* -w N, -v is a counter */
 440         opt = getopt32(argv, "w:v", &waitsec, &verbose);
 441         argc -= optind;
 442         argv += optind;
 443         action = *argv++;
 444         if (!action || !*argv) bb_show_usage();
 445         service = argv;
 446         services = argc - 1;
 447
 448         tnow = time(NULL) + 0x400000000000000aULL;
 449         tstart = tnow;
 450         curdir = open_read(".");
 451         if (curdir == -1)
 452                 fatal_cannot("open current directory");
 453
 454         act = &control;
 455         acts = "s";
 456         cbk = &check;
 457
 458         switch (*action) {
 459         case 'x':
 460         case 'e':
 461                 acts = "x";
 462                 if (!verbose) cbk = NULL;
 463                 break;
 464         case 'X':
 465         case 'E':
 466                 acts = "x";
 467                 kll = 1;
 468                 break;
 469         case 'D':
 470                 acts = "d";
 471                 kll = 1;
 472                 break;
 473         case 'T':
 474                 acts = "tc";
 475                 kll = 1;
 476                 break;
 477         case 'c':
 478                 if (str_equal(action, "check")) {
 479                         act = NULL;
 480                         acts = "c";
 481                         break;
 482                 }
 483         case 'u': case 'd': case 'o': case 't': case 'p': case 'h':
 484         case 'a': case 'i': case 'k': case 'q': case '1': case '2':
 485                 action[1] = '\0';
 486                 acts = action;
 487                 if (!verbose) cbk = NULL;
 488                 break;
 489         case 's':
 490                 if (str_equal(action, "shutdown")) {
 491                         acts = "x";
 492                         break;
 493                 }
 494                 if (str_equal(action, "start")) {
 495                         acts = "u";
 496                         break;
 497                 }
 498                 if (str_equal(action, "stop")) {
 499                         acts = "d";
 500                         break;
 501                 }
 502                 /* "status" */
 503                 act = &status;
 504                 cbk = NULL;
 505                 break;
 506         case 'r':
 507                 if (str_equal(action, "restart")) {
 508                         acts = "tcu";
 509                         break;
 510                 }
 511                 bb_show_usage();
 512         case 'f':
 513                 if (str_equal(action, "force-reload")) {
 514                         acts = "tc";
 515                         kll = 1;
 516                         break;
 517                 }
 518                 if (str_equal(action, "force-restart")) {
 519                         acts = "tcu";
 520                         kll = 1;
 521                         break;
 522                 }
 523                 if (str_equal(action, "force-shutdown")) {
 524                         acts = "x";
 525                         kll = 1;
 526                         break;
 527                 }
 528                 if (str_equal(action, "force-stop")) {
 529                         acts = "d";
 530                         kll = 1;
 531                         break;
 532                 }
 533         default:
 534                 bb_show_usage();
 535         }
 536
 537         servicex = service;
 538         for (i = 0; i < services; ++i) {
 539                 if ((**service != '/') && (**service != '.')) {
 540                         if (chdir(varservice) == -1)
 541                                 goto chdir_failed_0;
 542                 }
 543                 if (chdir(*service) == -1) {
 544  chdir_failed_0:
 545                         fail("cannot change to service directory");
 546                         goto nullify_service_0;
 547                 }
 548                 if (act && (act(acts) == -1)) {
 549  nullify_service_0:
 550                         *service = NULL;
 551                 }
 552                 if (fchdir(curdir) == -1)
 553                         fatal_cannot("change to original directory");
 554                 service++;
 555         }
 556
 557         if (cbk) while (1) {
 558                 int diff;
 559
 560                 diff = tnow - tstart;
 561                 service = servicex;
 562                 want_exit = 1;
 563                 for (i = 0; i < services; ++i, ++service) {
 564                         if (!*service)
 565                                 continue;
 566                         if ((**service != '/') && (**service != '.')) {
 567                                 if (chdir(varservice) == -1)
 568                                         goto chdir_failed;
 569                         }
 570                         if (chdir(*service) == -1) {
 571  chdir_failed:
 572                                 fail("cannot change to service directory");
 573                                 goto nullify_service;
 574                         }
 575                         if (cbk(acts) != 0)
 576                                 goto nullify_service;
 577                         want_exit = 0;
 578                         if (diff >= waitsec) {
 579                                 printf(kll ? "kill: " : "timeout: ");
 580                                 if (svstatus_get() > 0) {
 581                                         svstatus_print(*service);
 582                                         ++rc;
 583                                 }
 584                                 bb_putchar('\n'); /* will also flush the output */
 585                                 if (kll)
 586                                         control("k");
 587  nullify_service:
 588                                 *service = NULL;
 589                         }
 590                         if (fchdir(curdir) == -1)
 591                                 fatal_cannot("change to original directory");
 592                 }
 593                 if (want_exit) break;
 594                 usleep(420000);
 595                 tnow = time(NULL) + 0x400000000000000aULL;
 596         }
 597         return rc > 99 ? 99 : rc;
 598 }