X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=src%2Fsnmp.c;h=228ed8e246579053972002a1bb5bfb7d5b0cc455;hb=262bb701c8e79a2234530f832bf9cca6b90303ad;hp=7568cf67be39070dc8ec885d14edd4e195dde341;hpb=35f98b6e5c4c30bd7aeb52c7894c5f6e276638da;p=collectd.git

diff --git a/src/snmp.c b/src/snmp.c
index 7568cf67..228ed8e2 100644
--- a/src/snmp.c
+++ b/src/snmp.c
@@ -302,7 +302,7 @@ static int csnmp_config_add_data_shift (data_definition_t *dd, oconfig_item_t *c
   if ((ci->values_num != 1)
       || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
   {
-    WARNING ("snmp plugin: The `Scale' config option needs exactly one number argument.");
+    WARNING ("snmp plugin: The `Shift' config option needs exactly one number argument.");
     return (-1);
   }
 
@@ -655,8 +655,9 @@ static int csnmp_config_add_host (oconfig_item_t *ci)
   if (hd->interval != 0)
     cb_interval.tv_sec = (time_t) hd->interval;
 
-  status = plugin_register_complex_read (cb_name, csnmp_read_host,
-      /* interval = */ &cb_interval, /* user_data = */ &cb_data);
+  status = plugin_register_complex_read (/* group = */ NULL, cb_name,
+      csnmp_read_host, /* interval = */ &cb_interval,
+      /* user_data = */ &cb_data);
   if (status != 0)
   {
     ERROR ("snmp plugin: Registering complex read function failed.");
@@ -724,8 +725,11 @@ static value_t csnmp_value_list_to_value (struct variable_list *vl, int type,
     double scale, double shift)
 {
   value_t ret;
-  uint64_t temp = 0;
-  int defined = 1;
+  uint64_t tmp_unsigned = 0;
+  int64_t tmp_signed = 0;
+  _Bool defined = 1;
+  /* Set to true when the original SNMP type appears to have been signed. */
+  _Bool prefer_signed = 0;
 
   if ((vl->type == ASN_INTEGER)
       || (vl->type == ASN_UINTEGER)
@@ -735,15 +739,22 @@ static value_t csnmp_value_list_to_value (struct variable_list *vl, int type,
 #endif
       || (vl->type == ASN_GAUGE))
   {
-    temp = (uint32_t) *vl->val.integer;
-    DEBUG ("snmp plugin: Parsed int32 value is %"PRIu64".", temp);
+    tmp_unsigned = (uint32_t) *vl->val.integer;
+    tmp_signed = (int32_t) *vl->val.integer;
+
+    if ((vl->type == ASN_INTEGER)
+        || (vl->type == ASN_GAUGE))
+      prefer_signed = 1;
+
+    DEBUG ("snmp plugin: Parsed int32 value is %"PRIu64".", tmp_unsigned);
   }
   else if (vl->type == ASN_COUNTER64)
   {
-    temp = (uint32_t) vl->val.counter64->high;
-    temp = temp << 32;
-    temp += (uint32_t) vl->val.counter64->low;
-    DEBUG ("snmp plugin: Parsed int64 value is %"PRIu64".", temp);
+    tmp_unsigned = (uint32_t) vl->val.counter64->high;
+    tmp_unsigned = tmp_unsigned << 32;
+    tmp_unsigned += (uint32_t) vl->val.counter64->low;
+    tmp_signed = (int64_t) tmp_unsigned;
+    DEBUG ("snmp plugin: Parsed int64 value is %"PRIu64".", tmp_unsigned);
   }
   else if (vl->type == ASN_OCTET_STR)
   {
@@ -751,7 +762,21 @@ static value_t csnmp_value_list_to_value (struct variable_list *vl, int type,
   }
   else
   {
-    WARNING ("snmp plugin: I don't know the ASN type `%i'", (int) vl->type);
+    char oid_buffer[1024];
+
+    memset (oid_buffer, 0, sizeof (oid_buffer));
+    snprint_objid (oid_buffer, sizeof (oid_buffer) - 1,
+	vl->name, vl->name_length);
+
+#ifdef ASN_NULL
+    if (vl->type == ASN_NULL)
+      INFO ("snmp plugin: OID \"%s\" is undefined (type ASN_NULL)",
+	  oid_buffer);
+    else
+#endif
+      WARNING ("snmp plugin: I don't know the ASN type \"%i\" (OID: %s)",
+	  (int) vl->type, oid_buffer);
+
     defined = 0;
   }
 
@@ -805,17 +830,29 @@ static value_t csnmp_value_list_to_value (struct variable_list *vl, int type,
     }
   } /* if (vl->type == ASN_OCTET_STR) */
   else if (type == DS_TYPE_COUNTER)
-    ret.counter = temp;
+  {
+    ret.counter = tmp_unsigned;
+  }
   else if (type == DS_TYPE_GAUGE)
   {
-    ret.gauge = NAN;
-    if (defined != 0)
-      ret.gauge = (scale * temp) + shift;
+    if (!defined)
+      ret.gauge = NAN;
+    else if (prefer_signed)
+      ret.gauge = (scale * tmp_signed) + shift;
+    else
+      ret.gauge = (scale * tmp_unsigned) + shift;
   }
   else if (type == DS_TYPE_DERIVE)
-    ret.derive = (derive_t) temp;
+  {
+    if (prefer_signed)
+      ret.derive = (derive_t) tmp_signed;
+    else
+      ret.derive = (derive_t) tmp_unsigned;
+  }
   else if (type == DS_TYPE_ABSOLUTE)
-    ret.absolute = (absolute_t) temp;
+  {
+    ret.absolute = (absolute_t) tmp_unsigned;
+  }
   else
   {
     ERROR ("snmp plugin: csnmp_value_list_to_value: Unknown data source "
@@ -849,10 +886,12 @@ static int csnmp_check_res_left_subtree (const host_definition_t *host,
       vb = vb->next_variable, i++)
   {
     num_checked++;
-    if (snmp_oid_ncompare (data->values[i].oid,
-	  data->values[i].oid_len,
-	  vb->name, vb->name_length,
-	  data->values[i].oid_len) != 0)
+
+    if ((vb->type == SNMP_ENDOFMIBVIEW)
+	|| (snmp_oid_ncompare (data->values[i].oid,
+	    data->values[i].oid_len,
+	    vb->name, vb->name_length,
+	    data->values[i].oid_len) != 0))
       num_left_subtree++;
   }
 
@@ -889,6 +928,72 @@ static int csnmp_check_res_left_subtree (const host_definition_t *host,
   return (0);
 } /* int csnmp_check_res_left_subtree */
 
+static int csnmp_strvbcopy_hexstring (char *dst, /* {{{ */
+    const struct variable_list *vb, size_t dst_size)
+{
+  char *buffer_ptr;
+  size_t buffer_free;
+  size_t i;
+
+  buffer_ptr = dst;
+  buffer_free = dst_size;
+
+  for (i = 0; i < vb->val_len; i++)
+  {
+    int status;
+
+    status = snprintf (buffer_ptr, buffer_free,
+	(i == 0) ? "%02x" : ":%02x", (unsigned int) vb->val.bitstring[i]);
+
+    if (status >= buffer_free)
+    {
+      buffer_ptr += (buffer_free - 1);
+      *buffer_ptr = 0;
+      return (dst_size + (buffer_free - status));
+    }
+    else /* if (status < buffer_free) */
+    {
+      buffer_ptr += status;
+      buffer_free -= status;
+    }
+  }
+
+  return ((int) (dst_size - buffer_free));
+} /* }}} int csnmp_strvbcopy_hexstring */
+
+static int csnmp_strvbcopy (char *dst, /* {{{ */
+    const struct variable_list *vb, size_t dst_size)
+{
+  char *src;
+  size_t num_chars;
+  size_t i;
+
+  if (vb->type == ASN_OCTET_STR)
+    src = (char *) vb->val.string;
+  else if (vb->type == ASN_BIT_STR)
+    src = (char *) vb->val.bitstring;
+  else
+  {
+    dst[0] = 0;
+    return (EINVAL);
+  }
+
+  num_chars = dst_size - 1;
+  if (num_chars > vb->val_len)
+    num_chars = vb->val_len;
+
+  for (i = 0; i < num_chars; i++)
+  {
+    /* Check for control characters. */
+    if ((unsigned char)src[i] < 32)
+      return (csnmp_strvbcopy_hexstring (dst, vb, dst_size));
+    dst[i] = src[i];
+  }
+  dst[num_chars] = 0;
+
+  return ((int) vb->val_len);
+} /* }}} int csnmp_strvbcopy */
+
 static int csnmp_instance_list_add (csnmp_list_instances_t **head,
     csnmp_list_instances_t **tail,
     const struct snmp_pdu *res)
@@ -904,12 +1009,13 @@ static int csnmp_instance_list_add (csnmp_list_instances_t **head,
   if (vb == NULL)
     return (-1);
 
-  il = (csnmp_list_instances_t *) malloc (sizeof (csnmp_list_instances_t));
+  il = malloc (sizeof (*il));
   if (il == NULL)
   {
     ERROR ("snmp plugin: malloc failed.");
     return (-1);
   }
+  /* XXX copy entire OID */
   il->subid = vb->name[vb->name_length - 1];
   il->next = NULL;
 
@@ -917,17 +1023,8 @@ static int csnmp_instance_list_add (csnmp_list_instances_t **head,
   if ((vb->type == ASN_OCTET_STR) || (vb->type == ASN_BIT_STR))
   {
     char *ptr;
-    size_t instance_len;
-
-    memset (il->instance, 0, sizeof (il->instance));
-    instance_len = sizeof (il->instance) - 1;
-    if (instance_len > vb->val_len)
-      instance_len = vb->val_len;
 
-    sstrncpy (il->instance, (char *) ((vb->type == ASN_OCTET_STR)
-	  ? vb->val.string
-	  : vb->val.bitstring),
-	instance_len + 1);
+    csnmp_strvbcopy (il->instance, vb, sizeof (il->instance));
 
     for (ptr = il->instance; *ptr != '\0'; ptr++)
     {
@@ -1065,7 +1162,7 @@ static int csnmp_dispatch_table (host_definition_t *host, data_definition_t *dat
       char temp[DATA_MAX_NAME_LEN];
 
       if (instance_list_ptr == NULL)
-	ssnprintf (temp, sizeof (temp), "%u", (uint32_t) subid);
+	ssnprintf (temp, sizeof (temp), "%"PRIu32, (uint32_t) subid);
       else
 	sstrncpy (temp, instance_list_ptr->instance, sizeof (temp));
 
@@ -1222,7 +1319,8 @@ static int csnmp_read_table (host_definition_t *host, data_definition_t *data)
       break;
     }
 
-    /* if an instance-OID is configured.. */
+    /* Copy the OID of the value used as instance to oid_list, if an instance
+     * is configured. */
     if (data->instance.oid.oid_len > 0)
     {
       /* Allocate a new `csnmp_list_instances_t', insert the instance name and
@@ -1235,19 +1333,24 @@ static int csnmp_read_table (host_definition_t *host, data_definition_t *data)
 	break;
       }
 
-      /* Set vb on the last variable */
+      /* The instance OID is added to the list of OIDs to GET from the
+       * snmp agent last, so set vb on the last variable returned and copy
+       * that OID. */
       for (vb = res->variables;
 	  (vb != NULL) && (vb->next_variable != NULL);
 	  vb = vb->next_variable)
 	/* do nothing */;
       assert (vb != NULL);
 
-      /* Copy OID to oid_list[data->values_len] */
+      /* Copy the OID of the instance value to oid_list[data->values_len] */
       memcpy (oid_list[data->values_len].oid, vb->name,
 	  sizeof (oid) * vb->name_length);
       oid_list[data->values_len].oid_len = vb->name_length;
     }
 
+    /* Iterate over all the (non-instance) values returned by the agent. The
+     * (i < value_len) check will make sure we're not handling the instance OID
+     * twice. */
     for (vb = res->variables, i = 0;
 	(vb != NULL) && (i < data->values_len);
 	vb = vb->next_variable, i++)