void *extension_library_open(const char *name)
{
if (!enable_extension_libraries)
{
return NULL;
}
if (getenv("CFENGINE_TEST_OVERRIDE_EXTENSION_LIBRARY_DO_CLOSE") == NULL)
{
// Only do loading checks if we are not doing tests.
attempted_loading = true;
}
const char *dir = getenv("CFENGINE_TEST_OVERRIDE_EXTENSION_LIBRARY_DIR");
char lib[] = "/lib";
if (dir)
{
lib[0] = '\0';
}
else
{
dir = GetWorkDir();
}
char path[strlen(dir) + strlen(lib) + strlen(name) + 2];
sprintf(path, "%s%s/%s", dir, lib, name);
void *handle = shlib_open(path);
if (!handle)
{
return handle;
}
// Version check, to avoid binary incompatible plugins.
const char * (*GetExtensionLibraryVersion)() = shlib_load(handle, "GetExtensionLibraryVersion");
if (!GetExtensionLibraryVersion)
{
Log(LOG_LEVEL_ERR, "Could not retreive version from extension plugin (%s). Not loading the plugin.", name);
goto close_and_fail;
}
const char *plugin_version = GetExtensionLibraryVersion();
unsigned int bin_major, bin_minor, bin_patch;
unsigned int plug_major, plug_minor, plug_patch;
if (sscanf(VERSION, "%u.%u.%u", &bin_major, &bin_minor, &bin_patch) != 3)
{
Log(LOG_LEVEL_ERR, "Not able to extract version number from binary (%s). Not loading extension plugin.", name);
goto close_and_fail;
}
if (sscanf(plugin_version, "%u.%u.%u", &plug_major, &plug_minor, &plug_patch) != 3)
{
Log(LOG_LEVEL_ERR, "Not able to extract version number from plugin (%s). Not loading extension plugin.", name);
goto close_and_fail;
}
if (bin_major != plug_major || bin_minor != plug_minor || bin_patch != plug_patch)
{
Log(LOG_LEVEL_ERR, "Extension plugin version does not match CFEngine Community version "
"(CFEngine Community v%u.%u.%u, Extension (%s) v%u.%u.%u). Refusing to load it.",
bin_major, bin_minor, bin_patch, name, plug_major, plug_minor, plug_patch);
goto close_and_fail;
}
return handle;
close_and_fail:
shlib_close(handle);
return NULL;
}
void *extension_library_open(const char *name)
{
if (!enable_extension_libraries)
{
return NULL;
}
if (getenv("CFENGINE_TEST_OVERRIDE_EXTENSION_LIBRARY_DO_CLOSE") == NULL)
{
// Only do loading checks if we are not doing tests.
attempted_loading = true;
}
const char *dirs_to_try[3] = { NULL };
const char *dir = getenv("CFENGINE_TEST_OVERRIDE_EXTENSION_LIBRARY_DIR");
char lib[] = "/lib";
if (dir)
{
lib[0] = '\0';
dirs_to_try[0] = dir;
}
else
{
dirs_to_try[0] = GetWorkDir();
if (strcmp(WORKDIR, dirs_to_try[0]) != 0)
{
// try to load from the real WORKDIR in case GetWorkDir returned the local workdir to the user
// We try this because enterprise "make install" is in WORKDIR, not per user
dirs_to_try[1] = WORKDIR;
}
}
void *handle = NULL;
for (int i = 0; dirs_to_try[i]; i++)
{
char path[strlen(dirs_to_try[i]) + strlen(lib) + strlen(name) + 2];
xsnprintf(path, sizeof(path), "%s%s/%s", dirs_to_try[i], lib, name);
Log(LOG_LEVEL_DEBUG, "Trying to shlib_open extension plugin '%s' from '%s'", name, path);
handle = shlib_open(path);
if (handle)
{
Log(LOG_LEVEL_VERBOSE, "Successfully opened extension plugin '%s' from '%s'", name, path);
break;
}
else
{
const char *error;
if (errno == ENOENT)
{
error = "(not installed)";
}
else
{
error = GetErrorStr();
}
Log(LOG_LEVEL_VERBOSE, "Could not open extension plugin '%s' from '%s': %s", name, path, error);
}
}
if (!handle)
{
return handle;
}
// Version check, to avoid binary incompatible plugins.
const char * (*GetExtensionLibraryVersion)() = shlib_load(handle, "GetExtensionLibraryVersion");
if (!GetExtensionLibraryVersion)
{
Log(LOG_LEVEL_ERR, "Could not retrieve version from extension plugin (%s). Not loading the plugin.", name);
goto close_and_fail;
}
const char *plugin_version = GetExtensionLibraryVersion();
unsigned int bin_major, bin_minor, bin_patch;
unsigned int plug_major, plug_minor, plug_patch;
if (sscanf(VERSION, "%u.%u.%u", &bin_major, &bin_minor, &bin_patch) != 3)
{
Log(LOG_LEVEL_ERR, "Not able to extract version number from binary (%s). Not loading extension plugin.", name);
goto close_and_fail;
}
if (sscanf(plugin_version, "%u.%u.%u", &plug_major, &plug_minor, &plug_patch) != 3)
{
Log(LOG_LEVEL_ERR, "Not able to extract version number from plugin (%s). Not loading extension plugin.", name);
goto close_and_fail;
}
if (bin_major != plug_major || bin_minor != plug_minor || bin_patch != plug_patch)
{
Log(LOG_LEVEL_ERR, "Extension plugin version does not match CFEngine Community version "
"(CFEngine Community v%u.%u.%u, Extension (%s) v%u.%u.%u). Refusing to load it.",
bin_major, bin_minor, bin_patch, name, plug_major, plug_minor, plug_patch);
goto close_and_fail;
}
Log(LOG_LEVEL_VERBOSE, "Successfully loaded extension plugin '%s'", name);
return handle;
close_and_fail:
shlib_close(handle);
return NULL;
}
