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net-snmp/agent/mibgroup/ucd-snmp/disk_hw.c

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/*
* disk_hw.c
*/
#include <net-snmp/net-snmp-config.h>
#include <stdio.h>
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <signal.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include <net-snmp/agent/hardware/fsys.h>
#include "struct.h"
#include "disk.h"
#include "disk_hw.h"
#include "util_funcs/header_simple_table.h"
#if USING_UCD_SNMP_ERRORMIB_MODULE
#include "errormib.h"
#else
#define setPerrorstatus(x) snmp_log_perror(x)
#endif
/*
* * config file parsing routines
* */
static void disk_free_config(void);
static void disk_parse_config(const char *, char *);
static void disk_parse_config_all(const char *, char *);
static netsnmp_fsys_info ** _expand_disk_array( char *cptr );
#define MAX_INT_32 0x7fffffff
#define MAX_UINT_32 0xffffffff
int numdisks;
int allDisksIncluded = 0;
int allDisksMinPercent = 0;
int maxdisks = 0;
netsnmp_fsys_info **disks = NULL;
struct variable2 extensible_disk_variables[] = {
{MIBINDEX, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {MIBINDEX}},
{ERRORNAME, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {ERRORNAME}},
{DISKDEVICE, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKDEVICE}},
{DISKMINIMUM, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKMINIMUM}},
{DISKMINPERCENT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKMINPERCENT}},
{DISKTOTAL, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKTOTAL}},
{DISKAVAIL, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKAVAIL}},
{DISKUSED, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKUSED}},
{DISKPERCENT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKPERCENT}},
{DISKPERCENTNODE, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKPERCENTNODE}},
{ERRORFLAG, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {ERRORFLAG}},
{ERRORMSG, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {ERRORMSG}},
{DISKTOTALLOW, ASN_UNSIGNED, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKTOTALLOW}},
{DISKTOTALHIGH, ASN_UNSIGNED, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKTOTALHIGH}},
{DISKAVAILLOW, ASN_UNSIGNED, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKAVAILLOW}},
{DISKAVAILHIGH, ASN_UNSIGNED, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKAVAILHIGH}},
{DISKUSEDLOW, ASN_UNSIGNED, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKUSEDLOW}},
{DISKUSEDHIGH, ASN_UNSIGNED, NETSNMP_OLDAPI_RONLY,
var_extensible_disk, 1, {DISKUSEDHIGH}},
};
/*
* Define the OID pointer to the top of the mib tree that we're
* registering underneath
*/
oid disk_variables_oid[] = { NETSNMP_UCDAVIS_MIB, NETSNMP_DISKMIBNUM, 1 };
void
init_disk_hw(void)
{
/*
* register ourselves with the agent to handle our mib tree
*/
REGISTER_MIB("ucd-snmp/disk", extensible_disk_variables, variable2,
disk_variables_oid);
snmpd_register_config_handler("disk", disk_parse_config,
disk_free_config,
"path [ minspace | minpercent% ]");
snmpd_register_config_handler("includeAllDisks", disk_parse_config_all,
disk_free_config,
"minpercent%");
allDisksIncluded = 0;
allDisksMinPercent = 0;
}
static void
disk_free_config(void)
{
netsnmp_fsys_info *entry;
for ( entry = netsnmp_fsys_get_first();
entry != NULL;
entry = netsnmp_fsys_get_next( entry )) {
entry->minspace = -1;
entry->minpercent = -1;
entry->flags &= ~NETSNMP_FS_FLAG_UCD;
}
if (disks) {
free( disks );
disks = NULL;
maxdisks = numdisks = 0;
}
allDisksIncluded = 0;
allDisksMinPercent = 0;
}
static void
disk_parse_config(const char *token, char *cptr)
{
char path[STRMAX];
int minpercent;
int minspace;
netsnmp_fsys_info *entry;
/*
* Ensure there is space for the new entry
*/
if (numdisks == maxdisks) {
if (!_expand_disk_array( cptr ))
return;
}
/*
* read disk path (eg, /1 or /usr)
*/
copy_nword(cptr, path, sizeof(path));
cptr = skip_not_white(cptr);
cptr = skip_white(cptr);
/*
* read optional minimum disk usage spec
*/
if(cptr != NULL) {
if(strchr(cptr, '%') == NULL) {
minspace = atoi(cptr);
minpercent = -1;
}
else {
minspace = -1;
minpercent = atoi(cptr);
}
} else {
minspace = NETSNMP_DEFDISKMINIMUMSPACE;
minpercent = -1;
}
/*
* check if the disk already exists, if so then modify its
* parameters. if it does not exist then add it
*/
entry = netsnmp_fsys_by_path( path, NETSNMP_FS_FIND_CREATE );
if ( entry ) {
entry->minspace = minspace;
entry->minpercent = minpercent;
entry->flags |= NETSNMP_FS_FLAG_UCD;
disks[numdisks++] = entry;
}
}
static void
disk_parse_config_all(const char *token, char *cptr)
{
int minpercent = DISKMINPERCENT;
/*
* read the minimum disk usage percent
*/
if(cptr != NULL) {
if(strchr(cptr, '%') != NULL) {
minpercent = atoi(cptr);
}
}
/*
* if we have already seen the "includeAllDisks" directive
* then search for the disk in the "disks" array and modify
* the values. if we havent seen the "includeAllDisks"
* directive then include this disk
*/
if(allDisksIncluded) {
config_perror("includeAllDisks already specified.");
netsnmp_config_error("\tignoring: includeAllDisks %s", cptr);
}
else {
allDisksIncluded = 1;
allDisksMinPercent = minpercent;
}
}
/* add new entries to dskTable dynamically */
static void _refresh_disks(int minpercent)
{
netsnmp_fsys_info *entry;
for ( entry = netsnmp_fsys_get_first();
entry != NULL;
entry = netsnmp_fsys_get_next( entry )) {
if (!(entry->flags & NETSNMP_FS_FLAG_UCD)) {
/* this is new disk, add it to the table */
entry->minspace = -1;
entry->minpercent = minpercent;
entry->flags |= NETSNMP_FS_FLAG_UCD;
/*
* Ensure there is space for the new entry
*/
if (numdisks == maxdisks) {
if (!_expand_disk_array( entry->device ))
return;
}
disks[numdisks++] = entry;
}
}
}
static int _percent( unsigned long long value, unsigned long long total ) {
float v=value, t=total, pct;
/* avoid division by zero */
if (total == 0)
return 0;
pct = (v*100)/t; /* Calculate percentage using floating point
arithmetic, to avoid overflow errors */
pct += 0.5; /* rounding */
return (int)pct;
}
static netsnmp_fsys_info **
_expand_disk_array( char *cptr ) {
if ( maxdisks == 0 )
maxdisks = 50;
else
maxdisks *= 2;
disks = realloc( disks, maxdisks * sizeof( netsnmp_fsys_info*));
if (!disks) {
config_perror("malloc failed for new disk allocation.");
netsnmp_config_error("\tignoring: %s", cptr);
return NULL;
}
if ( maxdisks == 50 )
memset(disks, 0, maxdisks * sizeof( netsnmp_fsys_info*));
else
memset(disks + maxdisks/2, 0, maxdisks/2 * sizeof( netsnmp_fsys_info*));
return disks;
}
/*
* var_extensible_disk(...
* Arguments:
* vp IN - pointer to variable entry that points here
* name IN/OUT - IN/name requested, OUT/name found
* length IN/OUT - length of IN/OUT oid's
* exact IN - TRUE if an exact match was requested
* var_len OUT - length of variable or 0 if function returned
* write_method
*
*/
u_char *
var_extensible_disk(struct variable *vp,
oid * name,
size_t * length,
int exact,
size_t * var_len, WriteMethod ** write_method)
{
int disknum = 0;
netsnmp_fsys_info *entry;
unsigned long long val;
static long long_ret;
static char *errmsg;
netsnmp_cache *cache;
/* Update the fsys H/W module */
cache = netsnmp_fsys_get_cache();
netsnmp_cache_check_and_reload(cache);
if (allDisksIncluded)
_refresh_disks(allDisksMinPercent);
tryAgain:
if (header_simple_table
(vp, name, length, exact, var_len, write_method, numdisks))
return (NULL);
disknum = name[*length - 1] - 1;
entry = disks[disknum];
if ( !entry ) {
if (exact)
return NULL;
goto tryAgain;
}
if (!(entry->flags & NETSNMP_FS_FLAG_ACTIVE) || !(entry->flags & NETSNMP_FS_FLAG_UCD)) {
if (exact)
return NULL;
goto tryAgain;
}
switch (vp->magic) {
case MIBINDEX:
long_ret = disknum + 1;
return ((u_char *) (&long_ret));
case ERRORNAME: /* DISKPATH */
*var_len = strlen(entry->path);
return ((u_char *)entry->path);
case DISKDEVICE:
*var_len = strlen(entry->device);
return ((u_char *)entry->device);
case DISKMINIMUM:
long_ret = entry->minspace;
return ((u_char *) (&long_ret));
case DISKMINPERCENT:
long_ret = entry->minpercent;
return ((u_char *) (&long_ret));
case DISKTOTAL:
val = netsnmp_fsys_size_ull(entry);
if (val > MAX_INT_32)
long_ret = MAX_INT_32;
else
long_ret = (long)val;
return ((u_char *) (&long_ret));
case DISKTOTALLOW:
long_ret = netsnmp_fsys_size_ull(entry) & MAX_UINT_32;
return ((u_char *) (&long_ret));
case DISKTOTALHIGH:
long_ret = netsnmp_fsys_size_ull(entry) >> 32;
return ((u_char *) (&long_ret));
case DISKAVAIL:
val = netsnmp_fsys_avail_ull(entry);
if (val > MAX_INT_32)
long_ret = MAX_INT_32;
else
long_ret = (long)val;
return ((u_char *) (&long_ret));
case DISKAVAILLOW:
long_ret = netsnmp_fsys_avail_ull(entry) & MAX_UINT_32;
return ((u_char *) (&long_ret));
case DISKAVAILHIGH:
long_ret = netsnmp_fsys_avail_ull(entry) >> 32;
return ((u_char *) (&long_ret));
case DISKUSED:
val = netsnmp_fsys_used_ull(entry);
if (val > MAX_INT_32)
long_ret = MAX_INT_32;
else
long_ret = (long)val;
return ((u_char *) (&long_ret));
case DISKUSEDLOW:
long_ret = netsnmp_fsys_used_ull(entry) & MAX_UINT_32;
return ((u_char *) (&long_ret));
case DISKUSEDHIGH:
long_ret = netsnmp_fsys_used_ull(entry) >> 32;
return ((u_char *) (&long_ret));
case DISKPERCENT:
long_ret = _percent( entry->used, entry->size );
return ((u_char *) (&long_ret));
case DISKPERCENTNODE:
long_ret = _percent( entry->inums_total - entry->inums_avail, entry->inums_total );
return ((u_char *) (&long_ret));
case ERRORFLAG:
long_ret = 0;
val = netsnmp_fsys_avail_ull(entry);
if (( entry->minspace >= 0 ) &&
( val < entry->minspace ))
long_ret = 1;
else if (( entry->minpercent >= 0 ) &&
(_percent( entry->avail, entry->size ) < entry->minpercent ))
long_ret = 1;
return ((u_char *) (&long_ret));
case ERRORMSG:
free(errmsg);
errmsg = NULL;
*var_len = 0;
val = netsnmp_fsys_avail_ull(entry);
if ((entry->minspace >= 0 && val < entry->minspace &&
asprintf(&errmsg, "%s: less than %d free (= %d)", entry->path,
entry->minspace, (int) val) >= 0) ||
(entry->minpercent >= 0 &&
_percent(entry->avail, entry->size) < entry->minpercent &&
asprintf(&errmsg, "%s: less than %d%% free (= %d%%)", entry->path,
entry->minpercent, _percent(entry->avail, entry->size))
>= 0)) {
*var_len = strlen(errmsg);
}
return (u_char *) errmsg;
}
return NULL;
}
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