check_snmp: disable multiplier when unused

 - if no multiplier is set, simply return the given string. Otherwise we would strip off the unit.
 - if used, allocate new space to hold the result which might be larger than the initial input

Signed-off-by: Sven Nierlein <sven@consol.de>

1 files changed, 9 insertions, 4 deletions

diff --git a/plugins/check_snmp.c b/plugins/check_snmp.c
index d3968a27..c4ddd0ed 100644
--- a/plugins/check_snmp.c
+++ b/plugins/check_snmp.c
@@ -46,6 +46,7 @@ const char *email = "devel@monitoring-plugins.org";
 #define DEFAULT_PRIV_PROTOCOL "DES"
 #define DEFAULT_DELIMITER "="
 #define DEFAULT_OUTPUT_DELIMITER " "
+#define DEFAULT_BUFFER_SIZE 100
 
 #define mark(a) ((a)!=0?"*":"")
 
@@ -157,6 +158,7 @@ int perf_labels = 1;
 char* ip_version = "";
 double multiplier = 1.0;
 char *fmtstr = "";
+char buffer[DEFAULT_BUFFER_SIZE];
 
 static char *fix_snmp_range(char *th)
 {
@@ -1169,6 +1171,9 @@ multiply (char *str)
         double val;
         char *conv = "%f";
 
+        if(multiplier == 1)
+                return(str);
+
         if(verbose>2)
                 printf("    multiply input: %s\n", str);
 
@@ -1187,15 +1192,15 @@ multiply (char *str)
                 conv = fmtstr;
         }
         if (val == (int)val) {
-                sprintf(str, "%.0f", val);
+                snprintf(buffer, DEFAULT_BUFFER_SIZE, "%.0f", val);
         } else {
                 if(verbose>2)
                         printf("    multiply using format: %s\n", conv);
-                sprintf(str, conv, val);
+                snprintf(buffer, DEFAULT_BUFFER_SIZE, conv, val);
         }
         if(verbose>2)
-                printf("    multiply result: %s\n", str);
-        return str;
+                printf("    multiply result: %s\n", buffer);
+        return buffer;
 }