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-rw-r--r--contrib/check_hltherm.c209
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diff --git a/contrib/check_hltherm.c b/contrib/check_hltherm.c
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1/******************************************************************************************
2 *
3 * CHECK_HLTHERM.C
4 *
5 * Program: Hot Little Therm temperature plugin for Nagios
6 * License: GPL
7 * Copyright (c) 1999-2002 Ethan Galstad (nagios@nagios.org)
8 *
9 * Last Modified: 02-28-2002
10 *
11 * Command line: check_hltherm <probe> <wtemp> <ctemp> [-l label] [-s scale] [-lower]
12 *
13 * Description:
14 *
15 * This plugin checks the temperature of a given temperature probe on a
16 * Hot Little Therm digital thermometer. The plugin uses the 'therm' utility
17 * that is included with the HLT software to check the probe temperature. Both
18 * the HLT digital thermometer and software are produced by Spiderplant. See
19 * their website at http://www.spiderplant.com/hlt for more information.
20 *
21 *****************************************************************************************/
22
23#include "config.h"
24#include "common.h"
25#include "popen.h"
26
27#define DEFAULT_TIMEOUT 10 /* default timeout in seconds */
28
29#define HLTHERM_COMMAND "/usr/local/bin/therm" /* this should be moved out to the configure script */
30
31
32static void timeout_alarm_handler(int); /* author must provide */
33int process_arguments(int, char **);
34
35int timeout_interval=DEFAULT_TIMEOUT;
36
37double wtemp=0.0L;
38double ctemp=0.0L;
39
40int check_lower_temps=FALSE;
41
42char probe[MAX_INPUT_BUFFER]="";
43char label[MAX_INPUT_BUFFER]="Temperature";
44char scale[MAX_INPUT_BUFFER]="Degrees";
45
46FILE *fp;
47
48
49int main(int argc, char **argv){
50 int result=STATE_OK;
51 char command[MAX_INPUT_BUFFER];
52 double temp=0.0L;
53 char input_buffer[MAX_INPUT_BUFFER];
54 int found=0;
55
56 /* process command line arguments */
57 result=process_arguments(argc,argv);
58
59 /* display usage if there was a problem */
60 if(result==ERROR){
61 printf("Incorrect arguments supplied\n");
62 printf("\n");
63 printf("Hot Little Therm temperature plugin for Nagios\n");
64 printf("Copyright (c) 1999-2002 Ethan Galstad (nagios@nagios.org)\n");
65 printf("Last Modified: 02-28-2002\n");
66 printf("License: GPL\n");
67 printf("\n");
68 printf("Usage: %s <probe> <wtemp> <ctemp> [-l label] [-s scale] [-lower]\n",argv[0]);
69 printf("\n");
70 printf("Options:\n");
71 printf(" <wtemp> = Temperature necessary to result in a WARNING state\n");
72 printf(" <ctemp> = Temperature necessary to result in a CRITICAL state\n");
73 printf(" [label] = A descriptive label for the probe. Example: \"Outside Temp\"\n");
74 printf(" [scale] = A descriptive label for the temperature scale. Example: \"Celsius\"\n");
75 printf(" [-lower] = Evaluate temperatures with lower values being more critical\n");
76 printf("\n");
77 printf("This plugin checks the temperature of a given temperature probe on a\n");
78 printf("Hot Little Therm digital thermometer. The plugin uses the 'therm' utility\n");
79 printf("included with the HLT software to check the probe temperature. Both the\n");
80 printf("HLT digital thermometer and software are produced by Spiderplant. See\n");
81 printf("their website at http://www.spiderplant.com/hlt for more information.\n");
82 printf("\n");
83 return STATE_UNKNOWN;
84 }
85
86
87 result=STATE_OK;
88
89 /* Set signal handling and alarm */
90 if(signal(SIGALRM,timeout_alarm_handler)==SIG_ERR){
91 printf("Cannot catch SIGALRM");
92 return STATE_UNKNOWN;
93 }
94
95 /* handle timeouts gracefully */
96 alarm(timeout_interval);
97
98 /* create the command line we're going to use */
99 snprintf(command,sizeof(command),"%s %s",HLTHERM_COMMAND,probe);
100 command[sizeof(command)-1]='\x0';
101
102 /* run the command to check the temperature on the probe */
103 fp=spopen(command);
104 if(fp==NULL){
105 printf("Could not open pipe: %s\n",command);
106 return STATE_UNKNOWN;
107 }
108
109 if(fgets(input_buffer,MAX_INPUT_BUFFER-1,fp)){
110 found=1;
111 temp=(double)atof(input_buffer);
112 }
113
114 /* close the pipe */
115 spclose(fp);
116
117 if(result==STATE_OK){
118
119 if(found==0){
120 printf("Therm problem - Could not read program output\n");
121 result=STATE_CRITICAL;
122 }
123 else{
124 if(check_lower_temps==TRUE){
125 if(temp<=ctemp)
126 result=STATE_CRITICAL;
127 else if(temp<=wtemp)
128 result=STATE_WARNING;
129 }
130 else{
131 if(temp>=ctemp)
132 result=STATE_CRITICAL;
133 else if(temp>=wtemp)
134 result=STATE_WARNING;
135 }
136
137 printf("Therm %s: %s = %2.1f %s\n",(result==STATE_OK)?"ok":"problem",label,temp,scale);
138 }
139 }
140
141 return result;
142 }
143
144
145/* process command-line arguments */
146int process_arguments(int argc, char **argv){
147 int x;
148
149 /* not enough options were supplied */
150 if(argc<4)
151 return ERROR;
152
153 /* first option is always the probe name */
154 strncpy(probe,argv[1],sizeof(probe)-1);
155 probe[sizeof(probe)-1]='\x0';
156
157 /* 2nd and 3rd options are temperature thresholds */
158 wtemp=(double)atof(argv[2]);
159 ctemp=(double)atof(argv[3]);
160
161 /* process all remaining arguments */
162 for(x=5;x<=argc;x++){
163
164 /* we got the lower temperature option */
165 if(!strcmp(argv[x-1],"-lower"))
166 check_lower_temps=TRUE;
167
168 /* we got the label */
169 else if(!strcmp(argv[x-1],"-l")){
170 if(x<argc){
171 strncpy(label,argv[x],sizeof(label));
172 label[sizeof(label)-1]='\x0';
173 x++;
174 }
175 else
176 return ERROR;
177 }
178
179 /* we got the scale */
180 else if(!strcmp(argv[x-1],"-s")){
181 if(x<argc){
182 strncpy(scale,argv[x],sizeof(scale));
183 scale[sizeof(scale)-1]='\x0';
184 x++;
185 }
186 else
187 return ERROR;
188 }
189
190 /* else we got something else... */
191 else
192 return ERROR;
193 }
194
195 return OK;
196 }
197
198
199
200/* handle timeouts gracefully... */
201static void timeout_alarm_handler(int signo){
202
203 if(signo==SIGALRM){
204
205 kill(childpid[fileno(fp)],SIGKILL);
206 printf("Therm problem - Check timed out after %d seconds\n",timeout_interval);
207 exit(STATE_CRITICAL);
208 }
209 }