lmsensors.c

snmp的源代码,已经在我的ubuntu下编译通过

/* lmSensors.c
 *
 * Sections of this code were derived from the published API's of 
 * some Sun products.  Hence, portions of the code may be copyright
 * Sun Microsystems.
 *
 * This component allows net-snmp to report sensor information.
 *
 * In order to use it, the ./configure invocation must include...
 *
 * --with-mib-modules="ucd-snmp/lmSensors"
 *
 * It uses one of three different methodologies.  Some platforms make
 * use of an lm_sensors driver to access the information on the
 * health monitoring hardware, such as the LM75 and LM78 chips.
 *
 * For further information see http://secure.netroedge.com/~lm78/
 *
 * The Solaris platform uses the other two methodologies.  Earlier
 * platforms such as the Enterprise 450 use kstat to report sensor
 * information.  Later platforms, such as the V880 use the picld
 * daemon to control system resources and report sensor information.
 * Picld is supported only on Solaris 2.8 and later.
 *
 * Both these methodologies are implemented in a "read only" manner.
 * You cannot use this code to change anything eg. fan speeds.
 *
 * The lmSensors component delivers the information documented in the
 * LM-SENSORS-MIB.  The information is divided up as follows:
 *
 * -temperatures (Celsius)
 * -fans (rpm's)
 * -voltages
 * -other (switches, LEDs and  i2c's (things that use the i2c bus))
 * NOTE: This version does not support gpio's.  Still on the learning curve.
 *
 * Because the MIB only allows output of the datatype Gauge32 this
 * limits the amount of meaningful information that can be delivered
 * from "other" sensors.  Hence, the code does a certain amount of
 * translating.  See the source for individual sensor types.
 *
 * If an "other" sensor delivers a value 99, it means that it
 * is delivering a "status" that the code does not account for.
 * If you discover one of these, please pass it on and I'll
 * put it in.
 *
 * To see these messages, run the daemon as follows:
 * 
 * /usr/local/sbin/snmpd -f -L -Ducd-snmp/lmSensors
 *
 * or using gdb:
 *
 * gdb snmpd
 * run -f -L -Ducd-snmp/lmSensors
 *
 * The component can record up to 256 instances of each type.
 *
 * The following should always be included first before anything else 
 */

#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>

/*
 * minimal include directives 
 */

#include "util_funcs.h"
#include <time.h>

/*
 * Load required drivers and libraries.
 */

#ifdef solaris2
    #include <kstat.h>
    #ifdef HAVE_PICL_H 
        #include <picl.h> /* accesses the picld daemon */
    #endif 
    #include </usr/platform/sun4u/include/sys/envctrl.h>
#else
    #include <sensors/sensors.h>
    #define CONFIG_FILE_NAME "/etc/sensors.conf"
#endif

#include "lmSensors.h"

#define N_TYPES      (4)

#ifdef solaris2
    #define MAX_NAME     (256)
    #define MAX_SENSORS  (256) /* there's a lot of sensors on a v880 */
#else
    #define MAX_NAME     (64)
    #define MAX_SENSORS  (128)
#endif


/*
 * lmSensors_variables_oid:
 *   this is the top level oid that we want to register under.  This
 *   is essentially a prefix, with the suffix appearing in the
 *   variable below.
 */


oid             lmSensors_variables_oid[] =
    { 1, 3, 6, 1, 4, 1, 2021, 13, 16 };

/*
 * variable4 lmSensors_variables:
 *   this variable defines function callbacks and type return information 
 *   for the lmSensors mib section 
 */

struct variable4 lmSensors_variables[] = {
    /*
     * magic number        , variable type , ro/rw , callback fn  , L, oidsuffix 
     */
#define   LMTEMPSENSORSINDEX    3
    {LMTEMPSENSORSINDEX, ASN_INTEGER, RONLY, var_lmSensorsTable, 3,
     {2, 1, 1}},
#define   LMTEMPSENSORSDEVICE   4
    {LMTEMPSENSORSDEVICE, ASN_OCTET_STR, RONLY, var_lmSensorsTable, 3,
     {2, 1, 2}},
#define   LMTEMPSENSORSVALUE    5
    {LMTEMPSENSORSVALUE, ASN_GAUGE, RONLY, var_lmSensorsTable, 3,
     {2, 1, 3}},
#define   LMFANSENSORSINDEX     8
    {LMFANSENSORSINDEX, ASN_INTEGER, RONLY, var_lmSensorsTable, 3,
     {3, 1, 1}},
#define   LMFANSENSORSDEVICE    9
    {LMFANSENSORSDEVICE, ASN_OCTET_STR, RONLY, var_lmSensorsTable, 3,
     {3, 1, 2}},
#define   LMFANSENSORSVALUE     10
    {LMFANSENSORSVALUE, ASN_GAUGE, RONLY, var_lmSensorsTable, 3,
     {3, 1, 3}},
#define   LMVOLTSENSORSINDEX    13
    {LMVOLTSENSORSINDEX, ASN_INTEGER, RONLY, var_lmSensorsTable, 3,
     {4, 1, 1}},
#define   LMVOLTSENSORSDEVICE   14
    {LMVOLTSENSORSDEVICE, ASN_OCTET_STR, RONLY, var_lmSensorsTable, 3,
     {4, 1, 2}},
#define   LMVOLTSENSORSVALUE    15
    {LMVOLTSENSORSVALUE, ASN_GAUGE, RONLY, var_lmSensorsTable, 3,
     {4, 1, 3}},
#define   LMMISCSENSORSINDEX    18
    {LMMISCSENSORSINDEX, ASN_INTEGER, RONLY, var_lmSensorsTable, 3,
     {5, 1, 1}},
#define   LMMISCSENSORSDEVICE   19
    {LMMISCSENSORSDEVICE, ASN_OCTET_STR, RONLY, var_lmSensorsTable, 3,
     {5, 1, 2}},
#define   LMMISCSENSORSVALUE    20
    {LMMISCSENSORSVALUE, ASN_GAUGE, RONLY, var_lmSensorsTable, 3,
     {5, 1, 3}},
};

typedef struct {
#ifdef solaris2
    #ifdef HAVE_PICL_H
        char            name[PICL_PROPNAMELEN_MAX]; /*required for picld*/
        int             value;
    #else
       char            name[MAX_NAME];
       int             value;
    #endif
#else
    char            name[MAX_NAME];
    int             value;
#endif
} _sensor;

typedef struct {
    int             n;
    _sensor         sensor[MAX_SENSORS];
} _sensor_array;

static _sensor_array sensor_array[N_TYPES];
static clock_t  timestamp;

static int      sensor_init(void);
static void     sensor_load(void);
static void     _sensor_load(clock_t t);


/*
 * init_lmSensors():
 *   Initialization routine.  This is called when the agent starts up.
 *   At a minimum, registration of your variables should take place here.
 */
void
init_lmSensors(void)
{
   sensor_init(); 

    /*
     * register ourselves with the agent to handle our mib tree 
     */
    REGISTER_MIB("lmSensors", lmSensors_variables, variable4,
                 lmSensors_variables_oid);
}

/*
 * var_lmSensorsTable():
 *   Handle this table separately from the scalar value case.
 *   The workings of this are basically the same as for var_lmSensors above.
 */
unsigned char  *
var_lmSensorsTable(struct variable *vp,
                   oid * name,
                   size_t * length,
                   int exact,
                   size_t * var_len, WriteMethod ** write_method)
{
    static long     long_ret;
    static unsigned char string[SPRINT_MAX_LEN];
    int             i;  /* generates a variable not used error message in Solaris - that's OK */

    int             s_index;
    int             s_type = -1;
    int             n_sensors;

    _sensor         s;

    sensor_load();

    switch (vp->magic) {
    case LMTEMPSENSORSINDEX:
    case LMTEMPSENSORSDEVICE:
    case LMTEMPSENSORSVALUE:
        s_type = 0;
        n_sensors = sensor_array[0].n;
        break;

    case LMFANSENSORSINDEX:
    case LMFANSENSORSDEVICE:
    case LMFANSENSORSVALUE:
        s_type = 1;
        n_sensors = sensor_array[1].n;
        break;

    case LMVOLTSENSORSINDEX:
    case LMVOLTSENSORSDEVICE:
    case LMVOLTSENSORSVALUE:
        s_type = 2;
        n_sensors = sensor_array[2].n;
        break;

    case LMMISCSENSORSINDEX:
    case LMMISCSENSORSDEVICE:
    case LMMISCSENSORSVALUE:
        s_type = 3;
        n_sensors = sensor_array[3].n;
        break;

    default:
        s_type = -1;
        n_sensors = 0;
    }

    if (header_simple_table(vp, name, length, exact,
                            var_len, write_method,
                            n_sensors) == MATCH_FAILED)
        return NULL;

    if (s_type < 0)
        return NULL;

    s_index = name[*length - 1] - 1;
    s = sensor_array[s_type].sensor[s_index];

    switch (vp->magic) {
    case LMTEMPSENSORSINDEX:
    case LMFANSENSORSINDEX:
    case LMVOLTSENSORSINDEX:
    case LMMISCSENSORSINDEX:
        long_ret = s_index;
        return (unsigned char *) &long_ret;

    case LMTEMPSENSORSDEVICE:
    case LMFANSENSORSDEVICE:
    case LMVOLTSENSORSDEVICE:
    case LMMISCSENSORSDEVICE:
        strncpy(string, s.name, SPRINT_MAX_LEN - 1);
        *var_len = strlen(string);
        return (unsigned char *) string;

    case LMTEMPSENSORSVALUE:
    case LMFANSENSORSVALUE:
    case LMVOLTSENSORSVALUE:
    case LMMISCSENSORSVALUE:
        long_ret = s.value;
        return (unsigned char *) &long_ret;

    default:
        ERROR_MSG("Unable to handle table request");
    }

    return NULL;
}

static int
sensor_init(void)
{
#ifdef solaris2
    clock_t         t = time(NULL);
#else
    int             res;
    char            filename[] = CONFIG_FILE_NAME;
    clock_t         t = clock();
    FILE           *fp = fopen(filename, "r");
    if (!fp)
        return 1;

    if (res = sensors_init(fp))
        return 2;

    _sensor_load(t); /* I'll let the linux people decide whether they want to load right away */
#endif
    return 0;
}

static void
sensor_load(void)
{
#ifdef solaris2
    clock_t         t = time(NULL);
#else
    clock_t	t = clock();
#endif

    if (t > timestamp + 6) /* this may require some tuning - currently 6 seconds*/
        _sensor_load(t);

    return;
}

/* This next code block includes all kstat and picld code for the Solaris platform.
 * If you're not compiling on a Solaris that supports picld, it won't be included.