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/* |
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* Copyright (c) 2007, OmniTI Computer Consulting, Inc. |
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* All rights reserved. |
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*/ |
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#include "noit_defines.h" |
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#include <stdio.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <assert.h> |
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#include <math.h> |
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#include "noit_module.h" |
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#include "noit_check.h" |
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#include "noit_check_tools.h" |
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#include "utils/noit_log.h" |
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#include "utils/noit_hash.h" |
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#include <net-snmp/net-snmp-config.h> |
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#include <net-snmp/net-snmp-includes.h> |
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static noit_log_stream_t nlerr = NULL; |
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static noit_log_stream_t nldeb = NULL; |
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static noit_hash_table target_sessions = NOIT_HASH_EMPTY; |
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struct target_session { |
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void *sess_handle; |
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eventer_t timeoutevent; |
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int fd; |
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int in_table; |
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int refcnt; |
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}; |
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struct snmp_check_closure { |
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noit_module_t *self; |
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noit_check_t *check; |
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}; |
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struct check_info { |
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int reqid; |
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int timedout; |
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struct { |
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char *confname; |
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char *oidname; |
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oid oid[MAX_OID_LEN]; |
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size_t oidlen; |
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} *oids; |
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int noids; |
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eventer_t timeoutevent; |
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noit_module_t *self; |
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noit_check_t *check; |
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}; |
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|
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/* We hold struct check_info's in there key's by their reqid. |
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* If they timeout, we remove them. |
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* |
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* When SNMP queries complete, we look them up, if we find them |
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* then we know we can remove the timeout and complete the check. |
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* If we don't find them, the timeout fired and removed the check. |
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*/ |
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noit_hash_table active_checks = NOIT_HASH_EMPTY; |
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static void add_check(struct check_info *c) { |
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noit_hash_store(&active_checks, (char *)&c->reqid, sizeof(c->reqid), c); |
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} |
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static struct check_info *get_check(int reqid) { |
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struct check_info *c; |
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if(noit_hash_retrieve(&active_checks, (char *)&reqid, sizeof(reqid), |
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(void **)&c)) |
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return c; |
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return NULL; |
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} |
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static void remove_check(struct check_info *c) { |
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noit_hash_delete(&active_checks, (char *)&c->reqid, sizeof(c->reqid), |
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NULL, NULL); |
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} |
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|
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static int noit_snmp_init(noit_module_t *self) { |
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register_mib_handlers(); |
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read_premib_configs(); |
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read_configs(); |
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init_snmp("noitd"); |
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return 0; |
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} |
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|
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/* Handling of results */ |
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static void noit_snmp_log_results(noit_module_t *self, noit_check_t *check, |
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struct snmp_pdu *pdu) { |
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struct check_info *info = check->closure; |
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struct variable_list *vars; |
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struct timeval duration; |
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char buff[128]; |
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stats_t current; |
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int nresults = 0; |
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noit_check_stats_clear(¤t); |
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|
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if(pdu) |
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for(vars = pdu->variables; vars; vars = vars->next_variable) |
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nresults++; |
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gettimeofday(¤t.whence, NULL); |
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sub_timeval(current.whence, check->last_fire_time, &duration); |
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current.duration = duration.tv_sec * 1000 + duration.tv_usec / 1000; |
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current.available = pdu ? NP_AVAILABLE : NP_UNAVAILABLE; |
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current.state = (nresults == info->noids) ? NP_GOOD : NP_BAD; |
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snprintf(buff, sizeof(buff), "%d/%d gets", nresults, info->noids); |
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current.status = buff; |
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|
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/* We have no results over which to iterate. */ |
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if(!pdu) { |
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noit_check_set_stats(self, check, ¤t); |
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return; |
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} |
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|
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/* manipulate the information ourselves */ |
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nresults = 0; |
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for(vars = pdu->variables; vars; vars = vars->next_variable) { |
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char *sp; |
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int oid_idx; |
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double float_conv; |
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u_int64_t u64; |
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int64_t i64; |
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char *endptr; |
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char varbuff[256]; |
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|
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/* find the oid to which this is the response */ |
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oid_idx = nresults; /* our current idx is the most likely */ |
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if(info->oids[oid_idx].oidlen != vars->name_length || |
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memcmp(info->oids[oid_idx].oid, vars->name, |
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vars->name_length * sizeof(oid))) { |
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/* Not the most obvious guess */ |
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for(oid_idx = info->noids - 1; oid_idx >= 0; oid_idx--) { |
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if(info->oids[oid_idx].oidlen == vars->name_length && |
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memcmp(info->oids[oid_idx].oid, vars->name, |
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vars->name_length * sizeof(oid))) break; |
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} |
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} |
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if(oid_idx < 0) { |
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snprint_variable(varbuff, sizeof(varbuff), |
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vars->name, vars->name_length, vars); |
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noitL(nlerr, "Unexpected oid results to %s`%s`%s: %s\n", |
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check->target, check->module, check->name, varbuff); |
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nresults++; |
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continue; |
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} |
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#define SETM(a,b) noit_stats_set_metric(¤t, \ |
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info->oids[oid_idx].confname, a, b) |
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switch(vars->type) { |
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case ASN_OCTET_STR: |
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sp = malloc(1 + vars->val_len); |
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memcpy(sp, vars->val.string, vars->val_len); |
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sp[vars->val_len] = '\0'; |
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SETM(METRIC_STRING, sp); |
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free(sp); |
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break; |
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case ASN_INTEGER: |
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case ASN_GAUGE: |
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SETM(METRIC_INT32, vars->val.integer); |
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break; |
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case ASN_TIMETICKS: |
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case ASN_COUNTER: |
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SETM(METRIC_UINT32, vars->val.integer); |
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break; |
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case ASN_INTEGER64: |
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printI64(varbuff, vars->val.counter64); |
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i64 = strtoll(varbuff, &endptr, 10); |
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SETM(METRIC_INT64, (varbuff == endptr) ? NULL : &i64); |
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break; |
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case ASN_COUNTER64: |
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printU64(varbuff, vars->val.counter64); |
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u64 = strtoull(varbuff, &endptr, 10); |
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SETM(METRIC_UINT64, (varbuff == endptr) ? NULL : &u64); |
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break; |
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case ASN_FLOAT: |
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if(vars->val.floatVal) float_conv = *(vars->val.floatVal); |
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SETM(METRIC_DOUBLE, vars->val.floatVal ? &float_conv : NULL); |
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break; |
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case ASN_DOUBLE: |
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SETM(METRIC_DOUBLE, vars->val.doubleVal); |
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break; |
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default: |
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snprint_variable(varbuff, sizeof(varbuff), vars->name, vars->name_length, vars); |
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printf("%s!\n", varbuff); |
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/* Advance passed the first space and use that unless there |
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* is no space or we have no more string left. |
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*/ |
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sp = strchr(varbuff, ' '); |
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if(sp) sp++; |
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SETM(METRIC_STRING, (sp && *sp) ? sp : NULL); |
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} |
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nresults++; |
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} |
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noit_check_set_stats(self, check, ¤t); |
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} |
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struct target_session * |
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_get_target_session(char *target) { |
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struct target_session *ts; |
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if(!noit_hash_retrieve(&target_sessions, |
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target, strlen(target), (void **)&ts)) { |
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ts = calloc(1, sizeof(*ts)); |
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ts->fd = -1; |
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ts->refcnt = 0; |
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ts->in_table = 1; |
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noit_hash_store(&target_sessions, |
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strdup(target), strlen(target), ts); |
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} |
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return ts; |
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} |
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static int noit_snmp_session_cleanse(struct target_session *ts) { |
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if(ts->refcnt == 0 && ts->sess_handle) { |
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eventer_remove_fd(ts->fd); |
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if(ts->timeoutevent) eventer_remove(ts->timeoutevent); |
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ts->timeoutevent = NULL; |
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snmp_sess_close(ts->sess_handle); |
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ts->sess_handle = NULL; |
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if(!ts->in_table) { |
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free(ts); |
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} |
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return 1; |
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} |
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return 0; |
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} |
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static int noit_snmp_session_timeout(eventer_t e, int mask, void *closure, |
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struct timeval *now) { |
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struct target_session *ts = closure; |
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snmp_sess_timeout(ts->sess_handle); |
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noit_snmp_session_cleanse(ts); |
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return 0; |
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} |
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|
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static int noit_snmp_check_timeout(eventer_t e, int mask, void *closure, |
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struct timeval *now) { |
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struct check_info *info = closure; |
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info->timedout = 1; |
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remove_check(info); |
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/* Log our findings */ |
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noit_snmp_log_results(info->self, info->check, NULL); |
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info->check->flags &= ~NP_RUNNING; |
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return 0; |
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} |
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static void _set_ts_timeout(struct target_session *ts, struct timeval *t) { |
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struct timeval now; |
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eventer_t e = NULL; |
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if(ts->timeoutevent) e = eventer_remove(ts->timeoutevent); |
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ts->timeoutevent = NULL; |
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if(!t) return; |
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|
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gettimeofday(&now, NULL); |
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if(!e) e = eventer_alloc(); |
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e->callback = noit_snmp_session_timeout; |
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e->closure = ts; |
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e->mask = EVENTER_TIMER; |
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add_timeval(now, *t, &e->whence); |
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ts->timeoutevent = e; |
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eventer_add(e); |
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} |
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static int noit_snmp_handler(eventer_t e, int mask, void *closure, |
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struct timeval *now) { |
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fd_set fdset; |
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int fds, block = 0; |
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struct timeval timeout = { 0, 0 }; |
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struct target_session *ts = closure; |
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FD_ZERO(&fdset); |
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FD_SET(e->fd, &fdset); |
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fds = e->fd + 1; |
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snmp_sess_read(ts->sess_handle, &fdset); |
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if(noit_snmp_session_cleanse(ts)) |
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return 0; |
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snmp_sess_select_info(ts->sess_handle, &fds, &fdset, &timeout, &block); |
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_set_ts_timeout(ts, block ? &timeout : NULL); |
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return EVENTER_READ | EVENTER_EXCEPTION; |
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} |
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static int noit_snmp_asynch_response(int operation, struct snmp_session *sp, |
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int reqid, struct snmp_pdu *pdu, |
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void *magic) { |
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struct check_info *info; |
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struct target_session *ts = magic; |
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|
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/* We don't deal with refcnt hitting zero here. We could only be hit from |
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* the snmp read/timeout stuff. Handle it there. |
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*/ |
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ts->refcnt--; |
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|
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info = get_check(reqid); |
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if(!info) return 1; |
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remove_check(info); |
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if(info->timeoutevent) { |
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eventer_remove(info->timeoutevent); |
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eventer_free(info->timeoutevent); |
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info->timeoutevent = NULL; |
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} |
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|
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/* Log our findings */ |
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noit_snmp_log_results(info->self, info->check, pdu); |
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info->check->flags &= ~NP_RUNNING; |
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return 1; |
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} |
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|
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static void noit_snmp_sess_open(struct target_session *ts, |
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noit_check_t *check) { |
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const char *community; |
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struct snmp_session sess; |
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snmp_sess_init(&sess); |
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sess.version = SNMP_VERSION_2c; |
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sess.peername = check->target; |
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if(!noit_hash_retrieve(check->config, "community", strlen("community"), |
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(void **)&community)) { |
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community = "public"; |
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} |
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sess.community = (unsigned char *)community; |
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sess.community_len = strlen(community); |
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sess.callback = noit_snmp_asynch_response; |
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sess.callback_magic = ts; |
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ts->sess_handle = snmp_sess_open(&sess); |
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} |
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|
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static int noit_snmp_fill_req(struct snmp_pdu *req, noit_check_t *check) { |
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int i, klen; |
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noit_hash_iter iter = NOIT_HASH_ITER_ZERO; |
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const char *name, *value; |
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struct check_info *info = check->closure; |
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noit_hash_table check_attrs_hash = NOIT_HASH_EMPTY; |
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|
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/* Toss the old set and bail if we have zero */ |
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if(info->oids) { |
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for(i=0; i<info->noids;i++) { |
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if(info->oids[i].confname) free(info->oids[i].confname); |
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if(info->oids[i].oidname) free(info->oids[i].oidname); |
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} |
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free(info->oids); |
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} |
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info->noids = 0; |
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info->oids = NULL; |
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|
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/* Figure our how many. */ |
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343 |
while(noit_hash_next(check->config, &iter, &name, &klen, (void **)&value)) { |
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344 |
if(!strncasecmp(name, "oid_", 4)) { |
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info->noids++; |
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} |
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347 |
} |
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348 |
|
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349 |
if(info->noids == 0) return 0; |
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350 |
|
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/* Create a hash of important check attributes */ |
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352 |
noit_check_make_attrs(check, &check_attrs_hash); |
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353 |
#define CA_STORE(a,b) noit_hash_store(&check_attrs_hash, a, strlen(a), b) |
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CA_STORE("target", check->target); |
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CA_STORE("name", check->name); |
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356 |
CA_STORE("module", check->module); |
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|
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/* Fill out the new set of required oids */ |
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359 |
info->oids = calloc(info->noids, sizeof(*info->oids)); |
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360 |
memset(&iter, 0, sizeof(iter)); |
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i = 0; |
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362 |
while(noit_hash_next(check->config, &iter, &name, &klen, (void **)&value)) { |
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363 |
if(!strncasecmp(name, "oid_", 4)) { |
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char oidbuff[128]; |
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365 |
name += 4; |
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366 |
info->oids[i].confname = strdup(name); |
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367 |
noit_check_interpolate(oidbuff, sizeof(oidbuff), value, |
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368 |
&check_attrs_hash, check->config); |
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369 |
info->oids[i].oidname = strdup(oidbuff); |
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370 |
info->oids[i].oidlen = MAX_OID_LEN; |
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371 |
get_node(oidbuff, info->oids[i].oid, &info->oids[i].oidlen); |
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372 |
snmp_add_null_var(req, info->oids[i].oid, info->oids[i].oidlen); |
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373 |
i++; |
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374 |
} |
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375 |
} |
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376 |
assert(info->noids == i); |
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377 |
noit_hash_destroy(&check_attrs_hash, NULL, NULL); |
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378 |
return info->noids; |
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379 |
} |
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380 |
static int noit_snmp_send(noit_module_t *self, noit_check_t *check) { |
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381 |
struct snmp_pdu *req; |
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382 |
struct target_session *ts; |
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383 |
struct check_info *info = check->closure; |
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384 |
|
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385 |
info->self = self; |
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386 |
info->check = check; |
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387 |
info->timedout = 0; |
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388 |
|
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389 |
check->flags |= NP_RUNNING; |
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390 |
ts = _get_target_session(check->target); |
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391 |
gettimeofday(&check->last_fire_time, NULL); |
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392 |
if(!ts->refcnt) { |
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393 |
eventer_t newe; |
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394 |
int fds, block; |
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395 |
struct timeval timeout; |
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396 |
fd_set fdset; |
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397 |
noit_snmp_sess_open(ts, check); |
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398 |
block = 0; |
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399 |
fds = 0; |
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400 |
FD_ZERO(&fdset); |
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401 |
snmp_sess_select_info(ts->sess_handle, &fds, &fdset, &timeout, &block); |
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402 |
assert(fds > 0); |
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403 |
ts->fd = fds-1; |
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404 |
newe = eventer_alloc(); |
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405 |
newe->fd = ts->fd; |
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406 |
newe->callback = noit_snmp_handler; |
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407 |
newe->closure = ts; |
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408 |
newe->mask = EVENTER_READ | EVENTER_EXCEPTION; |
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409 |
eventer_add(newe); |
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410 |
} |
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411 |
if(!ts->sess_handle) { |
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412 |
/* Error */ |
---|
413 |
/* No need to do anything, this will be handled in the else below */ |
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414 |
} |
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415 |
ts->refcnt++; /* Increment here, decrement when this check completes */ |
---|
416 |
|
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417 |
req = snmp_pdu_create(SNMP_MSG_GET); |
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418 |
if(req) noit_snmp_fill_req(req, check); |
---|
419 |
/* Setup out snmp requests */ |
---|
420 |
if(ts->sess_handle && req && |
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421 |
(info->reqid = snmp_sess_send(ts->sess_handle, req)) != 0) { |
---|
422 |
struct timeval when, to; |
---|
423 |
info->timeoutevent = eventer_alloc(); |
---|
424 |
info->timeoutevent->callback = noit_snmp_check_timeout; |
---|
425 |
info->timeoutevent->closure = info; |
---|
426 |
info->timeoutevent->mask = EVENTER_TIMER; |
---|
427 |
|
---|
428 |
gettimeofday(&when, NULL); |
---|
429 |
to.tv_sec = check->timeout / 1000; |
---|
430 |
to.tv_usec = (check->timeout % 1000) * 1000; |
---|
431 |
add_timeval(when, to, &info->timeoutevent->whence); |
---|
432 |
eventer_add(info->timeoutevent); |
---|
433 |
add_check(info); |
---|
434 |
} |
---|
435 |
else { |
---|
436 |
ts->refcnt--; |
---|
437 |
noit_snmp_session_cleanse(ts); |
---|
438 |
/* Error */ |
---|
439 |
if(req) snmp_free_pdu(req); |
---|
440 |
/* Log our findings */ |
---|
441 |
noit_snmp_log_results(self, check, NULL); |
---|
442 |
check->flags &= ~NP_RUNNING; |
---|
443 |
} |
---|
444 |
return 0; |
---|
445 |
} |
---|
446 |
|
---|
447 |
static int noit_snmp_initiate_check(noit_module_t *self, noit_check_t *check, |
---|
448 |
int once, noit_check_t *cause) { |
---|
449 |
if(!check->closure) check->closure = calloc(1, sizeof(struct check_info)); |
---|
450 |
INITIATE_CHECK(noit_snmp_send, self, check); |
---|
451 |
return 0; |
---|
452 |
} |
---|
453 |
|
---|
454 |
static int noit_snmp_config(noit_module_t *self, noit_hash_table *config) { |
---|
455 |
return 0; |
---|
456 |
} |
---|
457 |
static int noit_snmp_onload(noit_module_t *self) { |
---|
458 |
nlerr = noit_log_stream_find("error/snmp"); |
---|
459 |
nldeb = noit_log_stream_find("debug/snmp"); |
---|
460 |
if(!nlerr) nlerr = noit_stderr; |
---|
461 |
if(!nldeb) nldeb = noit_debug; |
---|
462 |
eventer_name_callback("noit_snmp/check_timeout", noit_snmp_check_timeout); |
---|
463 |
eventer_name_callback("noit_snmp/session_timeout", noit_snmp_session_timeout); |
---|
464 |
eventer_name_callback("noit_snmp/handler", noit_snmp_handler); |
---|
465 |
return 0; |
---|
466 |
} |
---|
467 |
noit_module_t snmp = { |
---|
468 |
NOIT_MODULE_MAGIC, |
---|
469 |
NOIT_MODULE_ABI_VERSION, |
---|
470 |
"snmp", |
---|
471 |
"SNMP collection", |
---|
472 |
noit_snmp_onload, |
---|
473 |
noit_snmp_config, |
---|
474 |
noit_snmp_init, |
---|
475 |
noit_snmp_initiate_check, |
---|
476 |
NULL /* noit_snmp_cleanup */ |
---|
477 |
}; |
---|
478 |
|
---|