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Hacked together a smart_ plugin in C
There is some trickery going on to not wakeup the disk when it's in standby Note: this was aimed at munin-c, but was rejected since it uses a subprocess that calls the `smartctl` tool.
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plugins/disk/smart-c/smart.c
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plugins/disk/smart-c/smart.c
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/*
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* Copyright (C) 2017 Bastiaan van Kesteren <bas@edeation.nl> - All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2 or v.3.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <libgen.h>
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#include <sys/wait.h>
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#include "common.h"
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static char getitem(char *input, unsigned char item, char *output)
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{
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unsigned char i = 0;
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unsigned char seperators = 0;
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char know_this_seperator = 0;
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unsigned char start = 0;
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unsigned char stop = 0;
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/* Trim starting spaces */
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while (input[i] == ' ') {
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i++;
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}
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/* If we're requested to return the very first item... */
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if (seperators == item) {
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start = i;
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}
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while (input[i] && seperators < item + 1) {
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if (input[i] == ' ') {
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if (know_this_seperator == 0) {
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know_this_seperator = 1;
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seperators++;
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if (seperators == item + 1) {
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stop = i;
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break;
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}
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}
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} else if (know_this_seperator) {
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know_this_seperator = 0;
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if (seperators == item) {
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start = i;
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}
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} else if (input[i] == '\n') {
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input[i] = 0;
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break;
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}
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i++;
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}
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if (stop) {
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/* Found stop, means we have a start aswell */
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strncpy(output, &input[start], stop - start);
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return 1;
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} else if (start) {
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/* Have a start, no stop. We're returning the last item of the string */
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strcpy(output, &input[start]);
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return 1;
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}
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return 0;
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}
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int smart(int argc, char **argv)
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{
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char command[50];
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char output[255];
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char label[25][100];
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char value[25][25];
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unsigned char attribute = 0;
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FILE *f;
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unsigned int i;
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/* Prepare and execute command */
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snprintf(command, sizeof(command),
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"smartctl -A -d ata /dev/%s -n standby",
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&basename(argv[0])[6]);
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if ((f = popen(command, "r")) == 0) {
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return fail("cannot initiate command execution");
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}
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/* Process command output */
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while (fgets(output, sizeof(output), f) != NULL) {
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printf("#%s", output);
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/* Filter out attribute lines; look for lines starting with an attribute ID */
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if ((output[0] >= '0' && output[0] <= '9') ||
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(output[0] == ' '
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&& (output[1] >= '0' && output[1] <= '9'))
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|| (output[0] == ' ' && output[1] == ' '
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&& (output[2] >= '0' && output[2] <= '9'))) {
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/* Now, print the 2nd column (attribute name) and the 10th (raw value) */
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getitem(output, 1, label[attribute]);
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getitem(output, 9, value[attribute]);
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attribute++;
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if (attribute == 25) {
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break;
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}
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}
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}
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/* Close command (this is where we get the exit code! */
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i = WEXITSTATUS(pclose(f));
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if (i == 1 || /* smartctl command did not parse */
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/*i == 2 || *//* smartctl device open failed */
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i == 127) { /* command not found */
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return fail("command execution failed");
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}
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/* Setup for caching */
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snprintf(command, sizeof(command), "/mnt/ram/smart_%s",
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&basename(argv[0])[6]);
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if (attribute == 0) {
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printf("#Cached attributes\n");
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/* No output from command, try to fetch attribute-list from disk with NaN values */
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if ((f = fopen(command, "r")) == 0) {
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return
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fail
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("command did not return data, no cached attribute-list");
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return 0;
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}
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}
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if (argc > 1) {
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if (strcmp(argv[1], "config") == 0) {
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printf
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("graph_title S.M.A.R.T values for drive %s\n"
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"graph_args --base 1000 --lower-limit 0\n"
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"graph_vlabel Attribute S.M.A.R.T value\n"
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"graph_category disk\n",
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&basename(argv[0])[6]);
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if (attribute == 0) {
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while (fgets(output, sizeof(output), f) !=
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NULL) {
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for (i = 0; i < strlen(output);
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i++) {
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if (output[i] == '\n') {
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output[i] = '\0';
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break;
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}
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}
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printf("%s.label %s\n", output,
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output);
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}
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fclose(f);
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} else {
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f = fopen(command, "w");
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do {
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attribute--;
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printf("%s.label %s\n",
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label[attribute],
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label[attribute]);
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if (f) {
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fprintf(f, "%s\n",
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label[attribute]);
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}
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} while (attribute);
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if (f) {
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fclose(f);
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}
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}
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printf("standby.label standby\n");
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return 0;
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}
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}
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/* Asking for a fetch */
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if (attribute == 0) {
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/* No data, use cached info */
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while (fgets(output, sizeof(output), f) != NULL) {
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for (i = 0; i < strlen(output); i++) {
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if (output[i] == '\n') {
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output[i] = '\0';
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break;
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}
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}
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printf("%s.value U\n", output);
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}
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printf("standby.value 1\n");
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fclose(f);
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} else {
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do {
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attribute--;
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printf("%s.value %s\n", label[attribute],
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value[attribute]);
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} while (attribute);
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printf("standby.value 0\n");
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}
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return 0;
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}
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