This source file includes following definitions.
- add_env_params
- add_stonith_device
- add_tolerance
- add_stonith_params
- set_tag
- build_arg_context
- request_fencing
- main
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9
10 #include <crm_internal.h>
11
12 #include <sys/param.h>
13 #include <stdio.h>
14 #include <sys/types.h>
15 #include <sys/stat.h>
16 #include <unistd.h>
17 #include <sys/utsname.h>
18
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <stdbool.h>
22 #include <stdlib.h>
23 #include <string.h>
24
25 #include <crm/crm.h>
26 #include <crm/common/ipc.h>
27 #include <crm/cluster/internal.h>
28 #include <crm/common/cmdline_internal.h>
29 #include <crm/common/output_internal.h>
30
31 #include <crm/stonith-ng.h>
32 #include <crm/fencing/internal.h>
33 #include <crm/cib.h>
34 #include <crm/pengine/status.h>
35
36 #include <crm/common/xml.h>
37 #include <pacemaker-internal.h>
38
39 #define SUMMARY "stonith_admin - Access the Pacemaker fencing API"
40
41 char action = 0;
42
43 struct {
44 gboolean as_nodeid;
45 gboolean broadcast;
46 gboolean cleanup;
47 gboolean installed;
48 gboolean metadata;
49 gboolean registered;
50 gboolean validate_cfg;
51 GList *devices;
52 GHashTable *params;
53 int fence_level;
54 int timeout ;
55 long long tolerance_ms;
56 int delay;
57 char *agent;
58 char *confirm_host;
59 char *fence_host;
60 char *history;
61 char *last_fenced;
62 char *query;
63 char *reboot_host;
64 char *register_dev;
65 char *register_level;
66 char *targets;
67 char *terminate;
68 char *unfence_host;
69 char *unregister_dev;
70 char *unregister_level;
71 } options = {
72 .timeout = 120,
73 .delay = 0
74 };
75
76 gboolean add_env_params(const gchar *option_name, const gchar *optarg, gpointer data, GError **error);
77 gboolean add_stonith_device(const gchar *option_name, const gchar *optarg, gpointer data, GError **error);
78 gboolean add_stonith_params(const gchar *option_name, const gchar *optarg, gpointer data, GError **error);
79 gboolean add_tolerance(const gchar *option_name, const gchar *optarg, gpointer data, GError **error);
80 gboolean set_tag(const gchar *option_name, const gchar *optarg, gpointer data, GError **error);
81
82 #define INDENT " "
83
84
85 static GOptionEntry defn_entries[] = {
86 { "register", 'R', 0, G_OPTION_ARG_STRING, &options.register_dev,
87 "Register the named stonith device. Requires: --agent.\n"
88 INDENT "Optional: --option, --env-option.",
89 "DEVICE" },
90 { "deregister", 'D', 0, G_OPTION_ARG_STRING, &options.unregister_dev,
91 "De-register the named stonith device.",
92 "DEVICE" },
93 { "register-level", 'r', 0, G_OPTION_ARG_STRING, &options.register_level,
94 "Register a stonith level for the named target,\n"
95 INDENT "specified as one of NAME, @PATTERN, or ATTR=VALUE.\n"
96 INDENT "Requires: --index and one or more --device entries.",
97 "TARGET" },
98 { "deregister-level", 'd', 0, G_OPTION_ARG_STRING, &options.unregister_level,
99 "Unregister a stonith level for the named target,\n"
100 INDENT "specified as for --register-level. Requires: --index",
101 "TARGET" },
102
103 { NULL }
104 };
105
106 static GOptionEntry query_entries[] = {
107 { "list", 'l', 0, G_OPTION_ARG_STRING, &options.terminate,
108 "List devices that can terminate the specified host.\n"
109 INDENT "Optional: --timeout",
110 "HOST" },
111 { "list-registered", 'L', 0, G_OPTION_ARG_NONE, &options.registered,
112 "List all registered devices. Optional: --timeout.",
113 NULL },
114 { "list-installed", 'I', 0, G_OPTION_ARG_NONE, &options.installed,
115 "List all installed devices. Optional: --timeout.",
116 NULL },
117 { "list-targets", 's', 0, G_OPTION_ARG_STRING, &options.targets,
118 "List the targets that can be fenced by the\n"
119 INDENT "named device. Optional: --timeout.",
120 "DEVICE" },
121 { "metadata", 'M', 0, G_OPTION_ARG_NONE, &options.metadata,
122 "Show agent metadata. Requires: --agent.\n"
123 INDENT "Optional: --timeout.",
124 NULL },
125 { "query", 'Q', 0, G_OPTION_ARG_STRING, &options.query,
126 "Check the named device's status. Optional: --timeout.",
127 "DEVICE" },
128 { "history", 'H', 0, G_OPTION_ARG_STRING, &options.history,
129 "Show last successful fencing operation for named node\n"
130 INDENT "(or '*' for all nodes). Optional: --timeout, --cleanup,\n"
131 INDENT "--quiet (show only the operation's epoch timestamp),\n"
132 INDENT "--verbose (show all recorded and pending operations),\n"
133 INDENT "--broadcast (update history from all nodes available).",
134 "NODE" },
135 { "last", 'h', 0, G_OPTION_ARG_STRING, &options.last_fenced,
136 "Indicate when the named node was last fenced.\n"
137 INDENT "Optional: --as-node-id.",
138 "NODE" },
139 { "validate", 'K', 0, G_OPTION_ARG_NONE, &options.validate_cfg,
140 "Validate a fence device configuration.\n"
141 INDENT "Requires: --agent. Optional: --option, --env-option,\n"
142 INDENT "--quiet (print no output, only return status).",
143 NULL },
144
145 { NULL }
146 };
147
148 static GOptionEntry fence_entries[] = {
149 { "fence", 'F', 0, G_OPTION_ARG_STRING, &options.fence_host,
150 "Fence named host. Optional: --timeout, --tolerance, --delay.",
151 "HOST" },
152 { "unfence", 'U', 0, G_OPTION_ARG_STRING, &options.unfence_host,
153 "Unfence named host. Optional: --timeout, --tolerance, --delay.",
154 "HOST" },
155 { "reboot", 'B', 0, G_OPTION_ARG_STRING, &options.reboot_host,
156 "Reboot named host. Optional: --timeout, --tolerance, --delay.",
157 "HOST" },
158 { "confirm", 'C', 0, G_OPTION_ARG_STRING, &options.confirm_host,
159 "Tell cluster that named host is now safely down.",
160 "HOST", },
161
162 { NULL }
163 };
164
165 static GOptionEntry addl_entries[] = {
166 { "cleanup", 'c', 0, G_OPTION_ARG_NONE, &options.cleanup,
167 "Cleanup wherever appropriate. Requires --history.",
168 NULL },
169 { "broadcast", 'b', 0, G_OPTION_ARG_NONE, &options.broadcast,
170 "Broadcast wherever appropriate.",
171 NULL },
172 { "agent", 'a', 0, G_OPTION_ARG_STRING, &options.agent,
173 "The agent to use (for example, fence_xvm;\n"
174 INDENT "with --register, --metadata, --validate).",
175 "AGENT" },
176 { "option", 'o', 0, G_OPTION_ARG_CALLBACK, add_stonith_params,
177 "Specify a device configuration parameter as NAME=VALUE\n"
178 INDENT "(may be specified multiple times; with --register,\n"
179 INDENT "--validate).",
180 "PARAM" },
181 { "env-option", 'e', 0, G_OPTION_ARG_CALLBACK, add_env_params,
182 "Specify a device configuration parameter with the\n"
183 INDENT "specified name, using the value of the\n"
184 INDENT "environment variable of the same name prefixed with\n"
185 INDENT "OCF_RESKEY_ (may be specified multiple times;\n"
186 INDENT "with --register, --validate).",
187 "PARAM" },
188 { "tag", 'T', 0, G_OPTION_ARG_CALLBACK, set_tag,
189 "Identify fencing operations in logs with the specified\n"
190 INDENT "tag; useful when multiple entities might invoke\n"
191 INDENT "stonith_admin (used with most commands).",
192 "TAG" },
193 { "device", 'v', 0, G_OPTION_ARG_CALLBACK, add_stonith_device,
194 "Device ID (with --register-level, device to associate with\n"
195 INDENT "a given host and level; may be specified multiple times)"
196 #if PCMK__ENABLE_CIBSECRETS
197 "\n" INDENT "(with --validate, name to use to load CIB secrets)"
198 #endif
199 ".",
200 "DEVICE" },
201 { "index", 'i', 0, G_OPTION_ARG_INT, &options.fence_level,
202 "The stonith level (1-9) (with --register-level,\n"
203 INDENT "--deregister-level).",
204 "LEVEL" },
205 { "timeout", 't', 0, G_OPTION_ARG_INT, &options.timeout,
206 "Operation timeout in seconds (default 120;\n"
207 INDENT "used with most commands).",
208 "SECONDS" },
209 { "delay", 'y', 0, G_OPTION_ARG_INT, &options.delay,
210 "Apply a fencing delay in seconds. Any static/random delays from\n"
211 INDENT "pcmk_delay_base/max will be added, otherwise all\n"
212 INDENT "disabled with the value -1\n"
213 INDENT "(default 0; with --fence, --reboot, --unfence).",
214 "SECONDS" },
215 { "as-node-id", 'n', 0, G_OPTION_ARG_NONE, &options.as_nodeid,
216 "(Advanced) The supplied node is the corosync node ID\n"
217 INDENT "(with --last).",
218 NULL },
219 { "tolerance", 0, 0, G_OPTION_ARG_CALLBACK, add_tolerance,
220 "(Advanced) Do nothing if an equivalent --fence request\n"
221 INDENT "succeeded less than this many seconds earlier\n"
222 INDENT "(with --fence, --unfence, --reboot).",
223 "SECONDS" },
224
225 { NULL }
226 };
227
228
229 static pcmk__supported_format_t formats[] = {
230 PCMK__SUPPORTED_FORMAT_HTML,
231 PCMK__SUPPORTED_FORMAT_NONE,
232 PCMK__SUPPORTED_FORMAT_TEXT,
233 PCMK__SUPPORTED_FORMAT_XML,
234 { NULL, NULL, NULL }
235 };
236
237 static const int st_opts = st_opt_sync_call|st_opt_allow_self_fencing;
238
239 static char *name = NULL;
240
241 gboolean
242 add_env_params(const gchar *option_name, const gchar *optarg, gpointer data, GError **error) {
243 char *key = crm_strdup_printf("OCF_RESKEY_%s", optarg);
244 const char *env = getenv(key);
245 gboolean retval = TRUE;
246
247 if (env == NULL) {
248 g_set_error(error, PCMK__EXITC_ERROR, CRM_EX_INVALID_PARAM, "Invalid option: -e %s", optarg);
249 retval = FALSE;
250 } else {
251 crm_info("Got: '%s'='%s'", optarg, env);
252
253 if (options.params != NULL) {
254 options.params = pcmk__strkey_table(free, free);
255 }
256
257 pcmk__insert_dup(options.params, optarg, env);
258 }
259
260 free(key);
261 return retval;
262 }
263
264 gboolean
265 add_stonith_device(const gchar *option_name, const gchar *optarg, gpointer data, GError **error) {
266 options.devices = g_list_append(options.devices, pcmk__str_copy(optarg));
267 return TRUE;
268 }
269
270 gboolean
271 add_tolerance(const gchar *option_name, const gchar *optarg, gpointer data, GError **error) {
272
273 options.tolerance_ms = crm_get_msec(optarg);
274
275 if (options.tolerance_ms < 0) {
276 crm_warn("Ignoring invalid tolerance '%s'", optarg);
277 options.tolerance_ms = 0;
278 } else {
279 options.tolerance_ms = QB_MIN(options.tolerance_ms, UINT_MAX);
280 }
281 return TRUE;
282 }
283
284 gboolean
285 add_stonith_params(const gchar *option_name, const gchar *optarg, gpointer data, GError **error) {
286 char *name = NULL;
287 char *value = NULL;
288 int rc = 0;
289 gboolean retval = TRUE;
290
291 crm_info("Scanning: -o %s", optarg);
292
293 rc = pcmk__scan_nvpair(optarg, &name, &value);
294
295 if (rc != 2) {
296 rc = pcmk_legacy2rc(rc);
297 g_set_error(error, PCMK__RC_ERROR, rc, "Invalid option: -o %s: %s", optarg, pcmk_rc_str(rc));
298 retval = FALSE;
299 } else {
300 crm_info("Got: '%s'='%s'", name, value);
301
302 if (options.params == NULL) {
303 options.params = pcmk__strkey_table(free, free);
304 }
305
306 pcmk__insert_dup(options.params, name, value);
307 }
308
309 free(name);
310 free(value);
311 return retval;
312 }
313
314 gboolean
315 set_tag(const gchar *option_name, const gchar *optarg, gpointer data, GError **error) {
316 free(name);
317 name = crm_strdup_printf("%s.%s", crm_system_name, optarg);
318 return TRUE;
319 }
320
321 static GOptionContext *
322 build_arg_context(pcmk__common_args_t *args, GOptionGroup **group) {
323 GOptionContext *context = NULL;
324
325 GOptionEntry extra_prog_entries[] = {
326 { "quiet", 'q', 0, G_OPTION_ARG_NONE, &(args->quiet),
327 "Be less descriptive in output.",
328 NULL },
329
330 { NULL }
331 };
332
333 context = pcmk__build_arg_context(args, "text (default), html, xml", group, NULL);
334
335
336
337
338 pcmk__add_main_args(context, extra_prog_entries);
339
340 pcmk__add_arg_group(context, "definition", "Device Definition Commands:",
341 "Show device definition help", defn_entries);
342 pcmk__add_arg_group(context, "queries", "Queries:",
343 "Show query help", query_entries);
344 pcmk__add_arg_group(context, "fence", "Fencing Commands:",
345 "Show fence help", fence_entries);
346 pcmk__add_arg_group(context, "additional", "Additional Options:",
347 "Show additional options", addl_entries);
348 return context;
349 }
350
351
352 static int
353 request_fencing(stonith_t *st, const char *target, const char *command,
354 GError **error)
355 {
356 char *reason = NULL;
357 int rc = pcmk__request_fencing(st, target, command, name,
358 options.timeout * 1000,
359 options.tolerance_ms, options.delay,
360 &reason);
361
362 if (rc != pcmk_rc_ok) {
363 const char *rc_str = pcmk_rc_str(rc);
364 const char *what = "fence";
365
366 if (strcmp(command, PCMK_ACTION_ON) == 0) {
367 what = "unfence";
368 }
369
370
371 if (pcmk__str_eq(rc_str, reason, pcmk__str_none)) {
372 free(reason);
373 reason = NULL;
374 }
375
376 g_set_error(error, PCMK__RC_ERROR, rc,
377 "Couldn't %s %s: %s%s%s%s",
378 what, target, rc_str,
379 ((reason == NULL)? "" : " ("),
380 ((reason == NULL)? "" : reason),
381 ((reason == NULL)? "" : ")"));
382 }
383 free(reason);
384 return rc;
385 }
386
387 int
388 main(int argc, char **argv)
389 {
390 int rc = 0;
391 crm_exit_t exit_code = CRM_EX_OK;
392 bool no_connect = false;
393 bool required_agent = false;
394
395 char *target = NULL;
396 const char *device = NULL;
397 stonith_t *st = NULL;
398
399 GError *error = NULL;
400
401 pcmk__output_t *out = NULL;
402
403 GOptionGroup *output_group = NULL;
404 pcmk__common_args_t *args = pcmk__new_common_args(SUMMARY);
405 gchar **processed_args = pcmk__cmdline_preproc(argv, "adehilorstvyBCDFHQRTU");
406 GOptionContext *context = build_arg_context(args, &output_group);
407
408 pcmk__register_formats(output_group, formats);
409 if (!g_option_context_parse_strv(context, &processed_args, &error)) {
410 exit_code = CRM_EX_USAGE;
411 goto done;
412 }
413
414 pcmk__cli_init_logging("stonith_admin", args->verbosity);
415
416 if (name == NULL) {
417 name = strdup(crm_system_name);
418 }
419
420 rc = pcmk__output_new(&out, args->output_ty, args->output_dest, argv);
421 if (rc != pcmk_rc_ok) {
422 exit_code = CRM_EX_ERROR;
423 g_set_error(&error, PCMK__EXITC_ERROR, exit_code, "Error creating output format %s: %s",
424 args->output_ty, pcmk_rc_str(rc));
425 goto done;
426 }
427
428 pcmk__output_enable_list_element(out);
429
430 stonith__register_messages(out);
431
432 if (args->version) {
433 out->version(out, false);
434 goto done;
435 }
436
437 if (options.validate_cfg) {
438 required_agent = true;
439 no_connect = true;
440 action = 'K';
441 }
442
443 if (options.installed) {
444 no_connect = true;
445 action = 'I';
446 }
447
448 if (options.registered) {
449 action = 'L';
450 }
451
452 if (options.register_dev != NULL) {
453 required_agent = true;
454 action = 'R';
455 device = options.register_dev;
456 }
457
458 if (options.query != NULL) {
459 action = 'Q';
460 device = options.query;
461 }
462
463 if (options.unregister_dev != NULL) {
464 action = 'D';
465 device = options.unregister_dev;
466 }
467
468 if (options.targets != NULL) {
469 action = 's';
470 device = options.targets;
471 }
472
473 if (options.terminate != NULL) {
474 action = 'L';
475 target = options.terminate;
476 }
477
478 if (options.metadata) {
479 no_connect = true;
480 required_agent = true;
481 action = 'M';
482 }
483
484 if (options.reboot_host != NULL) {
485 no_connect = true;
486 action = 'B';
487 target = options.reboot_host;
488 crm_log_args(argc, argv);
489 }
490
491 if (options.fence_host != NULL) {
492 no_connect = true;
493 action = 'F';
494 target = options.fence_host;
495 crm_log_args(argc, argv);
496 }
497
498 if (options.unfence_host != NULL) {
499 no_connect = true;
500 action = 'U';
501 target = options.unfence_host;
502 crm_log_args(argc, argv);
503 }
504
505 if (options.confirm_host != NULL) {
506 action = 'C';
507 target = options.confirm_host;
508 crm_log_args(argc, argv);
509 }
510
511 if (options.last_fenced != NULL) {
512 action = 'h';
513 target = options.last_fenced;
514 }
515
516 if (options.history != NULL) {
517 action = 'H';
518 target = options.history;
519 }
520
521 if (options.register_level != NULL) {
522 action = 'r';
523 target = options.register_level;
524 }
525
526 if (options.unregister_level != NULL) {
527 action = 'd';
528 target = options.unregister_level;
529 }
530
531 if ((options.timeout > (UINT_MAX / 1000)) || (options.timeout < 0)) {
532 out->err(out, "Integer value \"%d\" for -t out of range", options.timeout);
533 exit_code = CRM_EX_USAGE;
534 goto done;
535 }
536
537 if (action == 0) {
538 char *help = g_option_context_get_help(context, TRUE, NULL);
539
540 out->err(out, "%s", help);
541 g_free(help);
542 exit_code = CRM_EX_USAGE;
543 goto done;
544 }
545
546 if (required_agent && options.agent == NULL) {
547 char *help = g_option_context_get_help(context, TRUE, NULL);
548
549 out->err(out, "Please specify an agent to query using -a,--agent [value]");
550 out->err(out, "%s", help);
551 g_free(help);
552 exit_code = CRM_EX_USAGE;
553 goto done;
554 }
555
556 out->quiet = args->quiet;
557
558 st = stonith_api_new();
559 if (st == NULL) {
560 rc = -ENOMEM;
561 } else if (!no_connect) {
562 rc = st->cmds->connect(st, name, NULL);
563 }
564 if (rc < 0) {
565 out->err(out, "Could not connect to fencer: %s", pcmk_strerror(rc));
566 exit_code = CRM_EX_DISCONNECT;
567 goto done;
568 }
569
570 switch (action) {
571 case 'I':
572 rc = pcmk__fence_installed(out, st, options.timeout*1000);
573 if (rc != pcmk_rc_ok) {
574 out->err(out, "Failed to list installed devices: %s", pcmk_rc_str(rc));
575 }
576
577 break;
578
579 case 'L':
580 rc = pcmk__fence_registered(out, st, target, options.timeout*1000);
581 if (rc != pcmk_rc_ok) {
582 out->err(out, "Failed to list registered devices: %s", pcmk_rc_str(rc));
583 }
584
585 break;
586
587 case 'Q':
588 rc = st->cmds->monitor(st, st_opts, device, options.timeout);
589 if (rc != pcmk_rc_ok) {
590 rc = st->cmds->list(st, st_opts, device, NULL, options.timeout);
591 }
592 rc = pcmk_legacy2rc(rc);
593 break;
594
595 case 's':
596 rc = pcmk__fence_list_targets(out, st, device, options.timeout*1000);
597 if (rc != pcmk_rc_ok) {
598 out->err(out, "Couldn't list targets: %s", pcmk_rc_str(rc));
599 }
600
601 break;
602
603 case 'R': {
604
605 stonith_key_value_t *params = NULL;
606 GHashTableIter iter;
607 gpointer key, val;
608
609 if (options.params != NULL) {
610 g_hash_table_iter_init(&iter, options.params);
611 while (g_hash_table_iter_next(&iter, &key, &val)) {
612 params = stonith_key_value_add(params, key, val);
613 }
614 }
615 rc = st->cmds->register_device(st, st_opts, device, NULL, options.agent,
616 params);
617 stonith_key_value_freeall(params, 1, 1);
618
619 rc = pcmk_legacy2rc(rc);
620 if (rc != pcmk_rc_ok) {
621 out->err(out, "Can't register device %s using agent %s: %s",
622 device, options.agent, pcmk_rc_str(rc));
623 }
624 break;
625 }
626
627 case 'D':
628 rc = st->cmds->remove_device(st, st_opts, device);
629 rc = pcmk_legacy2rc(rc);
630 if (rc != pcmk_rc_ok) {
631 out->err(out, "Can't unregister device %s: %s",
632 device, pcmk_rc_str(rc));
633 }
634 break;
635
636 case 'd':
637 rc = pcmk__fence_unregister_level(st, target, options.fence_level);
638 if (rc != pcmk_rc_ok) {
639 out->err(out, "Can't unregister topology level %d for %s: %s",
640 options.fence_level, target, pcmk_rc_str(rc));
641 }
642 break;
643
644 case 'r':
645 rc = pcmk__fence_register_level(st, target, options.fence_level, options.devices);
646 if (rc != pcmk_rc_ok) {
647 out->err(out, "Can't register topology level %d for %s: %s",
648 options.fence_level, target, pcmk_rc_str(rc));
649 }
650 break;
651
652 case 'M':
653 rc = pcmk__fence_metadata(out, st, options.agent, options.timeout*1000);
654 if (rc != pcmk_rc_ok) {
655 out->err(out, "Can't get fence agent meta-data: %s",
656 pcmk_rc_str(rc));
657 }
658
659 break;
660
661 case 'C':
662 rc = st->cmds->confirm(st, st_opts, target);
663 rc = pcmk_legacy2rc(rc);
664 break;
665
666 case 'B':
667 rc = request_fencing(st, target, PCMK_ACTION_REBOOT, &error);
668 break;
669
670 case 'F':
671 rc = request_fencing(st, target, PCMK_ACTION_OFF, &error);
672 break;
673
674 case 'U':
675 rc = request_fencing(st, target, PCMK_ACTION_ON, &error);
676 break;
677
678 case 'h':
679 rc = pcmk__fence_last(out, target, options.as_nodeid);
680 break;
681
682 case 'H':
683 rc = pcmk__fence_history(out, st, target, options.timeout*1000, args->verbosity,
684 options.broadcast, options.cleanup);
685 break;
686
687 case 'K':
688 device = NULL;
689 if (options.devices != NULL) {
690 device = g_list_nth_data(options.devices, 0);
691 }
692
693 rc = pcmk__fence_validate(out, st, options.agent, device, options.params,
694 options.timeout*1000);
695 break;
696 }
697
698 crm_info("Command returned: %s (%d)", pcmk_rc_str(rc), rc);
699 exit_code = pcmk_rc2exitc(rc);
700
701 done:
702 g_strfreev(processed_args);
703 pcmk__free_arg_context(context);
704
705 pcmk__output_and_clear_error(&error, out);
706
707 if (out != NULL) {
708 out->finish(out, exit_code, true, NULL);
709 pcmk__output_free(out);
710 }
711 pcmk__unregister_formats();
712 free(name);
713 g_list_free_full(options.devices, free);
714
715 if (options.params != NULL) {
716 g_hash_table_destroy(options.params);
717 }
718
719 if (st != NULL) {
720 st->cmds->disconnect(st);
721 stonith_api_delete(st);
722 }
723
724 return exit_code;
725 }
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![[help]](../icons/help.png){kind=icon}
*/
![[next]](../icons/right.png)
![[first]](../icons/n_first.png)
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![[previous]](../icons/left.png)
![[last]](../icons/n_last.png)
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