4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
27 * This file is part of Lustre, http://www.lustre.org/
28 * Lustre is a trademark of Sun Microsystems, Inc.
30 * snmp/lustre-snmp-trap.c
32 * Author: PJ Kirner <pjkirner@clusterfs.com>
36 * include important headers
39 #include <net-snmp/net-snmp-config.h>
40 #include <net-snmp/net-snmp-includes.h>
41 #include <net-snmp/agent/net-snmp-agent-includes.h>
47 #include <sys/types.h>
55 #include "lustre-snmp-util.h"
57 /**************************************************************************
59 *************************************************************************/
61 #define DEFAULT_POLL_INTERVAL_SECONDS 60
62 #define POLL_INTERVAL_ENV_VAR "LSNMP_POLL_INTERVAL"
63 #define SNMP_HEALTH_CHECK_TEST_FILE "LSNMP_HEALTH_CHECK_TEST_FILE"
65 /**************************************************************************
67 *************************************************************************/
69 static oid objid_snmptrap[] =
70 { 1,3,6,1,6,3,1,1,4,1,0};
71 static oid lustre_portals_trap[] =
72 { 1,3,6,1,4,1,13140,2,1,0,1};
73 static oid lustre_portals_trap_string[]=
74 { 1,3,6,1,4,1,13140,2,1,0,2};
75 static oid lustre_unhealthy_trap[] =
76 { 1,3,6,1,4,1,13140,2,1,0,3};
77 static oid lustre_unhealthy_trap_device_name_string[]=
78 { 1,3,6,1,4,1,13140,2,1,0,4};
79 static oid lustre_unhealthy_trap_reason_string[]=
80 { 1,3,6,1,4,1,13140,2,1,0,5};
82 /**************************************************************************
84 *************************************************************************/
86 typedef struct obd_unhealthy_entry_struct{
88 /*1-if seen as part of the the is_unhealthy scan, otherwise 0*/
91 /*single linked list pointer*/
92 struct obd_unhealthy_entry_struct *next;
94 /*obdname - variable size*/
99 /**************************************************************************
101 *************************************************************************/
103 int get_poll_interval_seconds();
104 void health_poll_worker(unsigned int registration_number, void *clientarg);
105 void send_portals_catastrophe_trap(char *reason_string);
106 void send_obd_unhealthy_trap(char *obd_name,char *reason_string);
107 int is_obd_newly_unhealthy(const char* obd_name);
108 void obd_unhealthy_scan(void);
109 void health_entry_parser(void);
111 /**************************************************************************
113 *************************************************************************/
115 static int g_sent_portals_catastrophe = 0;
116 static obd_unhealthy_entry* g_obd_unhealthy_list = NULL;
117 static int g_poll_interval_seconds;
118 static unsigned int g_registration_handle;
119 static char *g_health_check_test_file = 0;
121 /*****************************************************************************
122 * Function: initialize_trap_handler
124 * Description: Initlized the trap poll haalder.
128 * Output: Global g_poll_interval_seconds is set.
130 ****************************************************************************/
132 void initialize_trap_handler(void)
134 g_poll_interval_seconds = get_poll_interval_seconds();
136 g_registration_handle = snmp_alarm_register(g_poll_interval_seconds, 0, health_poll_worker, NULL);
137 if (g_registration_handle == 0)
138 report("%s %s: line %d %s", __FILE__, __FUNCTION__, __LINE__,
139 "snmp_alarm_register failed");
141 DEBUGMSGTL(("lsnmpd","lsnmp alarm registered poll interval = %d seconds\n",g_poll_interval_seconds));
143 g_health_check_test_file = getenv(SNMP_HEALTH_CHECK_TEST_FILE);
144 if(g_health_check_test_file != 0)
145 DEBUGMSGTL(("lsnmpd","lsnmp health check test file set to \'%s\'\n",g_health_check_test_file));
148 /*****************************************************************************
149 * Function: terminate_trap_handler
151 * Description: Terminate the trap poll haalder.
155 * Output: Global g_poll_interval_seconds is set.
157 ****************************************************************************/
159 void terminate_trap_handler(void)
161 snmp_alarm_unregister(g_registration_handle);
164 /*****************************************************************************
165 * Function: get_poll_interval_seconds
167 * Description: This function used to get the poll period for timer, which
168 * is used to read throughput values periodically.
170 * Output: Alarm period, default value(if env var not set) otherwise.
171 ****************************************************************************/
173 int get_poll_interval_seconds()
176 int ret_val = DEFAULT_POLL_INTERVAL_SECONDS;
178 /* Get Alarm period for reading the Lustre client table. */
180 alarm_period = getenv(POLL_INTERVAL_ENV_VAR);
181 if (alarm_period != NULL) {
182 char *ptr = alarm_period;
183 while(isdigit(*ptr)) ptr++;
185 /* if we have only digits then conver it*/
187 int time = atoi(alarm_period);
189 ret_val = time; /* Alarm period in seconds */
195 /*****************************************************************************
196 * Function: health_poll_worker
198 * Description: This is the routine registered to system timer for updating
199 * the throughput values for all the clients and its respective osc(s).
201 * Input: 'registration_number` value obtained during the alarm registration
202 * 'clientarg' pointing to user defined data type.
204 *****************************************************************************/
206 void health_poll_worker(unsigned int registration_number, void *clientarg)
208 health_entry_parser();
210 /* Register the function again to call after lustre_alarm_period */
211 if (!snmp_alarm_register(g_poll_interval_seconds, 0, health_poll_worker, NULL)) {
212 report("%s %s:line %d %s", __FILE__, __FUNCTION__, __LINE__,
213 "snmp_alarm_register failed");
217 /*****************************************************************************
218 * Function: health_entry_parser
220 * Description: This routine is called to parse the health_check entry
224 *****************************************************************************/
226 void health_entry_parser(void)
229 char string[MAX_LINE_SIZE];
230 int b_seen_portals_catastrophe = 0;
234 if (cfs_get_param_paths(&path, "health_check") != 0)
237 filename = g_health_check_test_file == 0 ? path.gl_pathv[0] : g_health_check_test_file;
239 /*DEBUGMSGTL(("lsnmpd","health_entry_parser(%s)\n",filename));*/
241 /* Open the file. Use the test file env variable if
243 fptr = fopen(filename,"r");
245 /* Free parameter's path string */
246 cfs_free_param_data(&path);
248 /* If the path is not found do nothing */
252 while( NULL != fgets(string, sizeof(string), fptr)){
254 /*DEBUGMSGTL(("lsnmpd","health_entry_parser() looking at = \'%s\'\n",string));*/
257 * First handle the portals catastrophe
258 * Look for the string "LBUG"
260 if(0 == strncmp(string,"LBUG",4)){
262 * If we haven't sent the catastrophe message yet
263 * send it now. And keep track that we've sent it
265 if(!g_sent_portals_catastrophe){
266 send_portals_catastrophe_trap("LBUG");
267 g_sent_portals_catastrophe = 1;
269 b_seen_portals_catastrophe = 1;
273 * Now handle any of the OBD object failures
274 * look for "device <OBDNAME> reported unhealthy"
276 else if(0 == strncmp(string,"device ",7)){
277 char *obd_name = string+7;
278 char *space_after_obd_name;
281 * Now find the space after the obd name
282 * Again if there is no space we're in trouble
284 space_after_obd_name = strchr(obd_name,' ');
285 if(space_after_obd_name == 0)
289 * Null terminate the obd_name
291 *space_after_obd_name = 0;
293 DEBUGMSGTL(("lsnmpd","Looking at obd=%s\n",obd_name));
296 * If we haven't sent a trap for this one
299 if(is_obd_newly_unhealthy(obd_name))
300 send_obd_unhealthy_trap(obd_name,"unhealthy");
304 /* If we don't find it reset the catastrope flag*/
305 if(!b_seen_portals_catastrophe && g_sent_portals_catastrophe)
307 DEBUGMSGTL(("lsnmpd","LBUG has been cleared\n"));
308 g_sent_portals_catastrophe = 0;
312 * Any <OBDNAMES> that weren't queried above are now unhealthy.
313 * Scan through and cleanup the newly healthy obds
315 obd_unhealthy_scan();
320 /*****************************************************************************
321 * Function: send_portals_catastrophe_trap
323 * Description: Send the SNMP V2 trap
325 * Input: 'reason_string' the reason for the catastrope.
328 *****************************************************************************/
330 void send_portals_catastrophe_trap(char *reason_string)
333 * Setup the trap variables.
334 * It's a linked list of netsnmp_variable_list items.
336 netsnmp_variable_list var_trap[2];
338 DEBUGMSGTL(("lsnmpd","Sending portals catastrophe trap reason=%s\n",reason_string));
341 * Setup the first variable in the trap data.
342 * Have it chain to another variable.
344 var_trap[0].next_variable = &var_trap[1];
346 /*The "name" must be the standard snmp "trap" OID.*/
347 var_trap[0].name = objid_snmptrap;
348 var_trap[0].name_length = sizeof(objid_snmptrap) / sizeof(oid);
350 /*But the data contained in this variable, is an OID that is the trap OID.*/
351 var_trap[0].type = ASN_OBJECT_ID;
352 var_trap[0].val.objid = lustre_portals_trap;
353 var_trap[0].val_len = sizeof(lustre_portals_trap);
356 * Setup the second variable in the trap data.
357 * It is the last in the chain so set next to NULL
359 var_trap[1].next_variable = NULL;
361 /* The "name" is the OID of the portals trap reason string */
362 var_trap[1].name = lustre_portals_trap_string;
363 var_trap[1].name_length = sizeof(lustre_portals_trap_string) / sizeof(oid);
365 /* And the data is an octet string, that contains the actually reason
367 var_trap[1].type = ASN_OCTET_STR;
368 var_trap[1].val.string = (unsigned char *)reason_string;
369 var_trap[1].val_len = strlen(reason_string);
371 /*And now send off the trap*/
372 send_v2trap(var_trap);
376 /*****************************************************************************
377 * Function: send_obd_unhealthy_trap
379 * Description: Send the SNMP V2 trap
381 * Input: 'obd_name' the name of the obd
382 * 'reason_string' the reason for the catastrope.
384 *****************************************************************************/
386 void send_obd_unhealthy_trap(char *obd_name,char *reason_string)
389 * Setup the trap variables.
390 * It's a linked list of netsnmp_variable_list items.
392 netsnmp_variable_list var_trap[3];
394 DEBUGMSGTL(("lsnmpd","Sending OBD unhealthy trap obd=%s reason=%s\n",obd_name,reason_string));
397 * Setup the first variable in the trap data.
398 * Have it chain to another variable.
400 var_trap[0].next_variable = &var_trap[1];
402 /*The "name" must be the standard snmp "trap" OID.*/
403 var_trap[0].name = objid_snmptrap;
404 var_trap[0].name_length = sizeof(objid_snmptrap) / sizeof(oid);
406 /*But the data contained in this variable, is an OID that is the trap OID.*/
407 var_trap[0].type = ASN_OBJECT_ID;
408 var_trap[0].val.objid = lustre_unhealthy_trap;
409 var_trap[0].val_len = sizeof(lustre_unhealthy_trap);
412 * Setup the second variable in the trap data.
413 * Have it chain to another variable.
415 var_trap[1].next_variable = &var_trap[2];;
417 /* The "name" is the OID of the portals trap reason string */
418 var_trap[1].name = lustre_unhealthy_trap_device_name_string;
419 var_trap[1].name_length = sizeof(lustre_unhealthy_trap_device_name_string) / sizeof(oid);
421 /* And the data is an octet string, that contains the actual reason
423 var_trap[1].type = ASN_OCTET_STR;
424 var_trap[1].val.string = (unsigned char *)obd_name;
425 var_trap[1].val_len = strlen(obd_name);
428 * Setup the third variable in the trap data.
429 * It is the last in the chain so set next to NULL
431 var_trap[2].next_variable = NULL;
433 /* The "name" is the OID of the portals trap reason string */
434 var_trap[2].name = lustre_unhealthy_trap_reason_string;
435 var_trap[2].name_length = sizeof(lustre_unhealthy_trap_reason_string) / sizeof(oid);
437 /* And the data is an octet string, that contains the actual reason
439 var_trap[2].type = ASN_OCTET_STR;
440 var_trap[2].val.string = (unsigned char *)reason_string;
441 var_trap[2].val_len = strlen(reason_string);
443 /*And now send off the trap*/
444 send_v2trap(var_trap);
448 /*****************************************************************************
449 * Function: is_obd_newly_unhealthy
451 * Description: Deterime if the obd is going from health->unhealth
452 * Also mark all unhealhy (new and old) as seen.
454 * Input: 'obd_name' the name of the obd
456 * Output: 1 if newly unhealthy 0 if previolsy unhealthy
457 *****************************************************************************/
459 int is_obd_newly_unhealthy(const char* obd_name)
461 /*for all elements in g_obd_unhealthy_list*/
462 obd_unhealthy_entry* walker;
463 obd_unhealthy_entry* entry;
466 for(walker = g_obd_unhealthy_list; walker != 0; walker = walker->next)
468 /*If the names match*/
469 if(0 == strcmp (walker->name,obd_name))
471 /* Commented out because it was just to noisy!
472 * DEBUGMSGTL(("lsnmpd","obd %s was already unhealthy\n",obd_name));
475 /*Mark the entry as seen, and return that it was previously unhealthy*/
481 DEBUGMSGTL(("lsnmpd","obd %s is now unhealthy\n",obd_name));
483 /*We didn't find an entry so we need to create a new one. */
484 /*Calculate the obd_name length*/
485 name_len = strlen(obd_name)+1;
487 /*Allocate a new entry*/
488 entry = malloc(sizeof(*entry) + name_len);
490 /*Put this element at the front of the list*/
491 entry->next = g_obd_unhealthy_list;
492 g_obd_unhealthy_list = entry;
494 /*Mark it initially as seen*/
497 /*And copy the entry name*/
498 memcpy(entry->name,obd_name,name_len);
500 /*return this obd as newly unhealthy.*/
505 /*****************************************************************************
506 * Function: obd_unhealthy_scan
508 * Description: Deterime if any obd is going from unhealthy->healthy
509 * Any of the obds that weren't "seen" by the
510 * is_obd_newly_unhealthy() pass are now health so
511 * remove them from the lists
512 * Also clear all "seen" flags.
516 *****************************************************************************/
518 void obd_unhealthy_scan(void)
520 /*fore all elements in g_obd_unhealthy_list*/
521 obd_unhealthy_entry* walker = g_obd_unhealthy_list;
522 obd_unhealthy_entry* prev = 0;
525 /*remove any that was not seen as unhealthy the last time*/
526 if(walker->seen == 0)
528 /*Remove element from the list, but first fix up the walker pointer*/
529 obd_unhealthy_entry* temp = walker;
531 DEBUGMSGTL(("lsnmpd","obd %s is now healthy\n",walker->name));
533 walker = walker->next;
535 /*Now adjust the pointers to effectively remove this entry*/
537 g_obd_unhealthy_list = walker;
541 /*And free the pointer. */
543 /*walker and prev are correctly setup so we can go around the loop again.*/
546 /*Mark all other entries as NOT seen for next pass through*/
550 /*Go onto the next entry*/
552 walker = walker->next;