Added check to see if cURL could fetch the XML-file

If cURL fails in retrieving the XML-file, then exit
with a UNKNOWN state.

HISTORY

@@ -0,0 +1,21 @@
+0.5 - 2014-08-15
+    Added a check to see if cURL was successful in
+    retrieving the XML-file. If it was not, then exit
+    with a UNKNOWN state and print the cURL error message.
+
+0.4 - 2014-08-09
+    Added /u modifier to more preg_matches for UTF-8
+    Replaced a-zåäö with \p{L}
+    Fixed a couple of spelling errors and missing words
+    Replaced $program with PROGRAM on line 122
+
+0.3 - 2014-08-03
+    Added /u modifier to the preg_match for UTF-8
+
+0.2 - 2014-07-31
+    Replaced 'shell_exec("curl -s URL")' with PHP cURL function
+    Replaced all state-variables with constants
+    Replaced version and program variables with constants
+
+0.1 - 2014-07-27
+    First release of check_smhiwarn

README.md

@@ -16,6 +16,9 @@ Don't forget to quote the district in the argument, such as the below example.
 
 Create one instance of each district you want to monitor.
 
+## Requirements ##
+The script requires PHP5 and the PHP5 cURL module (php5-curl on Debian systems).
+
 ## Copyright ##
 Original author is Jack-Benny Persson (jack-benny@cyberinfo.se).
 

check_smhiwarn.php

@@ -20,21 +20,22 @@
 */
 
 // Define exit status
-$ok = 0;
+define ("OK", 0);
-$warning = 1;
+define ("WARNING", 1);
-$critical = 2;
+define ("CRITICAL", 2);
-$unknown = 3;
+define ("UNKNOWN", 3);
 
-$version = 0.1;
+// Define version and program
-$program = $argv[0];
+define ("VERSION", 0.5);
+define ("PROGRAM", $argv[0]);
 
 // Function for printing usage
 function usage()
 {
-    print "check_smhiwarn version $GLOBALS[version]\n";
+    print "check_smhiwarn version " . VERSION . "\n";
     print "Copyright (C) Jack-Benny Persson <jack-benny@cyberinfo.se>\n";
-    print "Usage: $GLOBALS[program] 'District'\n";
+    print "Usage: " . PROGRAM .  " 'District'\n";
-    print "Example: $GLOBALS[program] 'Skåne län utom Österlen'\n";
+    print "Example: " . PROGRAM .  " 'Skåne län utom Österlen'\n";
 }
 
 // All of the avaliable districts
@@ -100,7 +101,7 @@ $availDistricts = array(
 if (!isset($argv[1]))
 {
     usage();
-    exit($unknown);
+    exit(UNKNOWN);
 }
 
 // Set first argument to $district
@@ -111,33 +112,46 @@ if ($district == 'list')
 {
     foreach ($availDistricts as $dist)
     print "$dist\n";
-    exit($unknown);
+    exit(UNKNOWN);
 }
 
 // Check if the district exists
-if (!preg_grep("/^$district$/", $availDistricts))
+if (!preg_grep("/^$district$/u", $availDistricts))
 {
     print "$district does not exists\n";
-    print "List all avaliable districts by \"$program 'list'\"\n";
+    print "List all avaliable districts by \"" . PROGRAM . " 'list'\"\n";
-    exit($unknown);
+    exit(UNKNOWN);
 }
 
 
 // Retrive the data
 //$data = file_get_contents("testing/smhi_alla_varningar.xml"); //For testing purposes
-$data = shell_exec("curl -s http://www.smhi.se/weatherSMHI2/varningar/smhi_alla_varningar.xml");
+$ch = curl_init("http://www.smhi.se/weatherSMHI2/varningar/smhi_alla_varningar.xml");
+curl_setopt($ch, CURLOPT_HEADER, 0);
+curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+curl_setopt($ch, CURLOPT_FAILONERROR, true);
+// check if curl failed and bail out if it did
+if (($data = curl_exec($ch)) === false)
+{
+    print curl_error($ch);
+    curl_close($ch);
+    exit(UNKNOWN);
+}
+curl_close($ch);
+
+//print "\n$data\n"; // for testing purposes (uncomment to view xml-file)
 
 // Regex the area (1st paranthesis is area, 2nd is warning class, 3rd is warning msg)
-preg_match("/($district)(?:: )(?:Varning klass )([1-3]+)(?:,\s)([-a-z0-9åäö.,&\s]*)/i", 
+preg_match("/($district)(?:: )(?:Varning klass )([1-3]+)(?:,\s)([-0-9\p{L}.,&\s]*)/iu", 
 $data, $matches);
 
 // Count how many warnings are issued and issue a critical if more than one
-preg_match_all("/$district/", $data, $counts);
+preg_match_all("/$district/u", $data, $counts);
 $numberMatches = (count($counts[0]));
 if ($numberMatches > 1)
 {
-    print "More than one warning are issued for $district, check smhi.se!";
+    print "More than one warning is issued for $district, check smhi.se!";
-    exit($critical);
+    exit(CRITICAL);
 }
 
 // Define the paranthesis
@@ -155,20 +169,20 @@ else
 switch ($warnLevel)
 {
     case 0:
-        print "No warnings issued $district";
+        print "No warnings issued for $district";
-        exit($ok);
+        exit(OK);
     case 1:
         print "Class 1 warning issued for $district: $warnMsg";
-        exit($warning);
+        exit(WARNING);
     case 2:
         print "Class 2 warning issued for $district: $warnMsg";
-        exit($critical);
+        exit(CRITICAL);
     case 3:
         print "Class 3 warning issued for $district: $warnMsg";
-        exit($critical);
+        exit(CRITICAL);
     default:
         print "Unknown error for $district";
-        exit($unknown);
+        exit(UNKNOWN);
 }
 
 ?>