snmp plugin: Improve error message.

Go to some length to make it possible to display the name of the
<host /> and <data /> block when complaining about an unknown ASN type.

diff --git a/src/snmp.c b/src/snmp.c
index 54bcf67..7a84851 100644 (file)
--- a/src/snmp.c
+++ b/src/snmp.c
@@ -703,7 +703,8 @@ static void csnmp_host_open_session (host_definition_t *host)
 
 /* TODO: Check if negative values wrap around. Problem: negative temperatures. */
 static value_t csnmp_value_list_to_value (struct variable_list *vl, int type,
-    double scale, double shift)
+    double scale, double shift,
+    const char *host_name, const char *data_name)
 {
   value_t ret;
   uint64_t tmp_unsigned = 0;
@@ -748,8 +749,11 @@ static value_t csnmp_value_list_to_value (struct variable_list *vl, int type,
          oid_buffer);
     else
 #endif
-      WARNING ("snmp plugin: I don't know the ASN type \"%i\" (OID: %s)",
-         (int) vl->type, oid_buffer);
+      WARNING ("snmp plugin: I don't know the ASN type #%i "
+               "(OID: \"%s\", data block \"%s\", host block \"%s\")",
+          (int) vl->type, oid_buffer,
+          (data_name != NULL) ? data_name : "UNKNOWN",
+          (host_name != NULL) ? host_name : "UNKNOWN");
 
     defined = 0;
   }
@@ -958,7 +962,8 @@ static int csnmp_strvbcopy (char *dst, /* {{{ */
 
 static int csnmp_instance_list_add (csnmp_list_instances_t **head,
     csnmp_list_instances_t **tail,
-    const struct snmp_pdu *res)
+    const struct snmp_pdu *res,
+    const host_definition_t *hd, const data_definition_t *dd)
 {
   csnmp_list_instances_t *il;
   struct variable_list *vb;
@@ -998,7 +1003,8 @@ static int csnmp_instance_list_add (csnmp_list_instances_t **head,
   }
   else
   {
-    value_t val = csnmp_value_list_to_value (vb, DS_TYPE_COUNTER, 1.0, 0.0);
+    value_t val = csnmp_value_list_to_value (vb, DS_TYPE_COUNTER,
+        /* scale = */ 1.0, /* shift = */ 0.0, hd->name, dd->name);
     ssnprintf (il->instance, sizeof (il->instance),
        "%llu", val.counter);
   }
@@ -1286,7 +1292,7 @@ static int csnmp_read_table (host_definition_t *host, data_definition_t *data)
       /* Allocate a new `csnmp_list_instances_t', insert the instance name and
        * add it to the list */
       if (csnmp_instance_list_add (&instance_list, &instance_list_ptr,
-           res) != 0)
+           res, host, data) != 0)
       {
        ERROR ("snmp plugin: csnmp_instance_list_add failed.");
        status = -1;
@@ -1342,7 +1348,7 @@ static int csnmp_read_table (host_definition_t *host, data_definition_t *data)
 
       vt->subid = vb->name[vb->name_length - 1];
       vt->value = csnmp_value_list_to_value (vb, ds->ds[i].type,
-         data->scale, data->shift);
+          data->scale, data->shift, host->name, data->name);
       vt->next = NULL;
 
       if (value_table_ptr[i] == NULL)
@@ -1492,8 +1498,8 @@ static int csnmp_read_value (host_definition_t *host, data_definition_t *data)
     for (i = 0; i < data->values_len; i++)
       if (snmp_oid_compare (data->values[i].oid, data->values[i].oid_len,
            vb->name, vb->name_length) == 0)
-       vl.values[i] = csnmp_value_list_to_value (vb, ds->ds[i].type,
-           data->scale, data->shift);
+        vl.values[i] = csnmp_value_list_to_value (vb, ds->ds[i].type,
+            data->scale, data->shift, host->name, data->name);
   } /* for (res->variables) */
 
   if (res != NULL)