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/*
* linux_vars.c --
*
* This file contains the implementation of Linux specific SNMP variables.
*
* Copyright (c) 1996-1998
*
* Juergen Schoenwaelder University of Twente, The Netherlands
* TU Braunschweig, Germany
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of CMU not be
* used in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
*
* THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
* THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
* ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*
*/
#include "mib_module.h"
#ifdef HAVE_LINUX
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
struct variable linux_variables[] = {
{LINUXCPU, STRING, RONLY, var_linux, 1, {1}},
{LINUXBOGO, GAUGE, RONLY, var_linux, 1, {2}},
{LINUXLOAD1, INTEGER, RONLY, var_linux, 1, {3}},
{LINUXLOAD5, INTEGER, RONLY, var_linux, 1, {4}},
{LINUXLOAD15, INTEGER, RONLY, var_linux, 1, {5}}
};
static oid linux_base [] = { 1, 3, 6, 1, 4, 1, 1575, 1, 5, 2 };
void
linux_init()
{
mib_register(linux_base, 10, (struct variable *)linux_variables,
sizeof(linux_variables)/sizeof(*linux_variables),
sizeof(*linux_variables));
}
/*
* Get information about the CPUs from the proc filesystem.
*/
static void
get_cpu_info(cpu, bogo)
char cpu[];
long *bogo;
{
char line[256], key[256], val[256];
FILE *in;
*bogo = 0, cpu[0] = 0;
in = fopen("/proc/cpuinfo", "r");
if (! in) return;
while (fgets(line, sizeof(line), in)) {
if (2 == sscanf(line, "%[^:]: %[^\n]", key, val)) {
/* the 2.0.x and 2.1.x /proc/cpuinfo format differs; this
should give a useable string anyway: */
if (strncmp(key, "cpu\t\t", 5) == 0
|| strncmp(key, "model", 5) == 0
|| strncmp(key, "vendor_id", 9) == 0) {
if (strlen(cpu) + strlen(val) + 1 < 255) {
if (cpu[0]) { strcat(cpu, " "); }
strcat(cpu, val);
}
} else if (strncmp(key, "bogomips", 8) == 0) {
*bogo = atoi(val);
}
}
}
fclose(in);
}
/*
* Get the load averages for 1, 5 and 15 minutes from the
* /proc filesystem.
*/
static void
get_load_avg(avg1, avg5, avg15)
unsigned *avg1;
unsigned *avg5;
unsigned *avg15;
{
float f1, f5, f15;
FILE *in;
*avg1 = 0, *avg5 = 0, *avg15 = 0;
in = fopen("/proc/loadavg", "r");
if (! in) return;
if (3 == fscanf(in, "%f %f %f", &f1, &f5, &f15)) {
*avg1 = (int) (f1 * 100);
*avg5 = (int) (f5 * 100);
*avg15 = (int) (f15 * 100);
}
fclose(in);
}
/*
* Entry for the linux mib:
*/
u_char *
var_linux(vp, name, length, exact, var_len, write_method)
struct variable *vp; /* IN - ptr to variable entry that points here */
oid *name; /* IN/OUT - input name req, output name found */
int *length; /* IN/OUT - length of input and output oid's */
int exact; /* IN - TRUE if an exact match was requested. */
int *var_len; /* OUT - length of var or 0 if function ret. */
int (**write_method)(); /* OUT - ptr to func to set var, else 0 */
{
oid newname[MAX_NAME_LEN];
int result;
static char cpu[256];
static long bogo = 0;
static unsigned avg1, avg5, avg15;
/* nothing writable provided: */
*write_method = 0;
/* default return type: */
*var_len = sizeof(long);
bcopy((char *)vp->name, (char *)newname, vp->namelen * sizeof(oid));
newname[vp->namelen] = 0;
result = compare(name, *length, newname, (int)vp->namelen + 1);
if ((exact && (result != 0)) || (!exact && (result >= 0)))
return NULL;
bcopy((char *)newname, (char *)name, (vp->namelen + 1) * sizeof(oid));
*length = vp->namelen + 1;
if (! bogo) {
get_cpu_info(cpu, &bogo);
}
switch (vp->magic) {
case LINUXCPU:
*var_len = strlen(cpu);
return cpu;
break;
case LINUXBOGO:
return (u_char *) &bogo;
break;
case LINUXLOAD1:
get_load_avg(&avg1, &avg5, &avg15);
return (u_char *) &avg1;
break;
case LINUXLOAD5:
get_load_avg(&avg1, &avg5, &avg15);
return (u_char *) &avg5;
break;
case LINUXLOAD15:
get_load_avg(&avg1, &avg5, &avg15);
return (u_char *) &avg15;
break;
}
return NULL;
}
#endif
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