common: added utility function

Added function for checking computer system instance name. This is
usefull particularly in methods expecting an instance of
CIM_ComputerSystem passed as a parameter and needing to check whether it
matches current system.

2 files changed, 75 insertions, 0 deletions

diff --git a/src/libs/libopenlmi/openlmi.c b/src/libs/libopenlmi/openlmi.c
index 1259fbc..958a7ef 100644
--- a/src/libs/libopenlmi/openlmi.c
+++ b/src/libs/libopenlmi/openlmi.c
@@ -123,11 +123,79 @@ static bool get_computer_system(const CMPIBroker *cb, const CMPIContext *ctx)
     return true;
 }
 
+static bool lmi_is_this_system(const char *system_name)
+{
+    // TODO accept also aliases and FQDNs
+    return strcmp(system_name, _system_name) == 0;
+}
+
+
 CMPIObjectPath *lmi_get_computer_system(void)
 {
     return _computer_system;
 }
 
+bool lmi_check_computer_system(const CMPIObjectPath *computer_system)
+{
+    CMPIString *nsa = NULL;
+    CMPIString *nsb = NULL;
+    CMPIString *cls_name = NULL;
+    CMPIData data;
+    CMPIObjectPath *our = lmi_get_computer_system();
+    CMPIStatus status = {CMPI_RC_OK, NULL};
+
+    if (!our) {
+        lmi_error("Memory allocation failed");
+        return false;
+    }
+    if (!(nsb = CMGetNameSpace(computer_system, NULL)))
+        return false;
+    if (!(nsa = CMGetNameSpace(our, NULL)))
+        return false;
+    if (strcmp(CMGetCharsPtr(nsa, NULL), CMGetCharsPtr(nsb, NULL))) {
+        lmi_warn("Namespace of computer system does not match.");
+        return false;
+    }
+    if ((cls_name = CMGetClassName(our, NULL)) == NULL)
+        return false;
+    if (!CMClassPathIsA(_cb, computer_system,
+                CMGetCharsPtr(cls_name, NULL), NULL)) {
+        lmi_warn("Computer system class \"%s\" does not inherit from \"%s\".",
+                CMGetCharsPtr(CMGetClassName(computer_system, NULL), NULL),
+                CMGetCharsPtr(cls_name, NULL));
+        return false;
+    }
+    data = CMGetKey(computer_system, "CreationClassName", &status);
+    if (status.rc || data.type != CMPI_string ||
+            (data.state != CMPI_goodValue && data.state != CMPI_keyValue))
+    {
+        lmi_warn("Missing CreationClassName property in computer system"
+               " instance (status=%u, data.type=%u, data.state=%u).",
+               status.rc, data.type, data.state);
+        return false;
+    }
+    if (!CMClassPathIsA(_cb, computer_system,
+               CMGetCharsPtr(data.value.string, NULL), &status)) {
+        lmi_warn("Bad CreationClassName property in computer system"
+               " instance.");
+        return false;
+    }
+    data = CMGetKey(computer_system, "Name", &status);
+    if (status.rc || data.type != CMPI_string ||
+            (data.state != CMPI_goodValue && data.state != CMPI_keyValue))
+    {
+        lmi_warn("Missing Name property in computer system instance.");
+        return false;
+    }
+    if (!lmi_is_this_system(CMGetCharsPtr(data.value.string, NULL))) {
+        lmi_warn("Name \"%s\" of computer system do no match this system \"%s\".",
+                CMGetCharsPtr(data.value.string, NULL));
+        return false;
+    }
+
+    return true;
+}
+
 const char *lmi_get_system_name(void)
 {
     return _system_name;
diff --git a/src/libs/libopenlmi/openlmi.h b/src/libs/libopenlmi/openlmi.h
index 3609489..7f2158b 100644
--- a/src/libs/libopenlmi/openlmi.h
+++ b/src/libs/libopenlmi/openlmi.h
@@ -88,6 +88,13 @@ typedef struct {
 CMPIObjectPath *lmi_get_computer_system(void);
 
 /**
+ * Check object path of CIM_ComputerSystem.
+ *
+ * @return true, if the object path matches this computer system.
+ */
+bool lmi_check_computer_system(const CMPIObjectPath *computer_system);
+
+/**
  * This function returns system name for the computer system
  *
  * @note Use this in the SystemName property of all provider created instances.