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/* Dynamic loading of the sort backend.
* We use GLib's multiplatform dl() wrapper
* to open up libsortsieve and
* populate the global 'sort' structure.
*
* (c) 2005 Aaron Stone <aaron@serendipity.cx>
*/
#include "dbmail.h"
#define THIS_MODULE "sort"
static sort_func *sort = NULL;
/* Returns:
* 1 on modules unsupported
* 0 on success
* -1 on failure to load module
* -2 on missing symbols
* -3 on memory error
*/
int sort_load_driver(void)
{
GModule *module;
char *lib = NULL;
char *driver = NULL;
if (!g_module_supported()) {
TRACE(TRACE_EMERG, "loadable modules unsupported on this platform");
return 1;
}
sort = g_new0(sort_func,1);
if (!sort) {
TRACE(TRACE_EMERG, "cannot allocate memory");
return -3;
}
/* The only supported driver is Sieve. */
driver = "sort_sieve";
Field_T library_dir;
config_get_value("library_directory", "DBMAIL", library_dir);
if (strlen(library_dir) == 0) {
TRACE(TRACE_DEBUG, "no value for library_directory, using default [%s]", DEFAULT_LIBRARY_DIR);
snprintf(library_dir, sizeof(Field_T), "%s", DEFAULT_LIBRARY_DIR);
} else {
TRACE(TRACE_DEBUG, "library_directory is [%s]", library_dir);
}
/* Try local build area, then dbmail lib paths, then system lib path. */
int i;
char *lib_path[] = { library_dir, NULL };
/* Note that the limit here *includes* the NULL. This is intentional,
* to allow g_module_build_path to try the current working directory. */
for (i = 0; i < 2; i++) {
lib = g_module_build_path(lib_path[i], driver);
module = g_module_open(lib, 0); // non-lazy bind.
TRACE(TRACE_DEBUG, "looking for %s as %s", driver, lib);
g_free(lib);
if (!module)
TRACE(TRACE_INFO, "cannot load %s", g_module_error());
if (module)
break;
}
/* If the list is exhausted without opening a module, we'll catch it,
* but we don't bomb out as we do for db and auth; just deliver normally. */
if (!module) {
TRACE(TRACE_EMERG, "could not load sort module - turn up debug level for details");
return -1;
}
if (!g_module_symbol(module, "sort_process", (gpointer)&sort->process )
|| !g_module_symbol(module, "sort_validate", (gpointer)&sort->validate )
|| !g_module_symbol(module, "sort_free_result", (gpointer)&sort->free_result )
|| !g_module_symbol(module, "sort_listextensions", (gpointer)&sort->listextensions )
|| !g_module_symbol(module, "sort_get_cancelkeep", (gpointer)&sort->get_cancelkeep )
|| !g_module_symbol(module, "sort_get_reject", (gpointer)&sort->get_reject )
|| !g_module_symbol(module, "sort_get_errormsg", (gpointer)&sort->get_errormsg )
|| !g_module_symbol(module, "sort_get_error", (gpointer)&sort->get_error )
|| !g_module_symbol(module, "sort_get_mailbox", (gpointer)&sort->get_mailbox )) {
TRACE(TRACE_ERR, "cannot find function: %s: Did you enable SIEVE sorting in the DELIVERY "
"section of dbmail.conf but forget to build the Sieve loadable module?", g_module_error());
return -2;
}
return 0;
}
SortResult_T *sort_process(uint64_t user_idnr, DbmailMessage *message, const char *mailbox)
{
if (!sort)
sort_load_driver();
if (!sort->process) {
TRACE(TRACE_ERR, "Error loading sort driver");
return NULL;
}
return sort->process(user_idnr, message, mailbox);
}
SortResult_T *sort_validate(uint64_t user_idnr, char *scriptname)
{
if (!sort)
sort_load_driver();
if (!sort->validate) {
TRACE(TRACE_ERR, "Error loading sort driver");
return NULL;
}
return sort->validate(user_idnr, scriptname);
}
const char *sort_listextensions(void)
{
if (!sort)
sort_load_driver();
if (!sort->listextensions) {
TRACE(TRACE_ERR, "Error loading sort driver");
return NULL;
}
return sort->listextensions();
}
void sort_free_result(SortResult_T *result)
{
if (!sort->free_result)
return;
return sort->free_result(result);
}
int sort_get_cancelkeep(SortResult_T *result)
{
if (!sort->get_cancelkeep)
return 0;
return sort->get_cancelkeep(result);
}
int sort_get_reject(SortResult_T *result)
{
if (!sort->get_reject)
return 0;
return sort->get_reject(result);
}
const char * sort_get_mailbox(SortResult_T *result)
{
if (!sort->get_mailbox)
return "";
return sort->get_mailbox(result);
}
const char * sort_get_errormsg(SortResult_T *result)
{
if (!sort->get_errormsg)
return "";
return sort->get_errormsg(result);
}
int sort_get_error(SortResult_T *result)
{
if (!sort->get_error)
return 0;
return sort->get_error(result);
}
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