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/* register.c
* Definitions for protocol registration
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "register-int.h"
#include "ws_attributes.h"
#include <glib.h>
#include <epan/exceptions.h>
#include "epan/dissectors/dissectors.h"
static const char *cur_cb_name = NULL;
// We could use g_atomic_pointer_set/get instead of a mutex, but that causes
// a false positive with Clang and TSAN for GLib < 2.64.0 (Issue #17753):
// https://gitlab.gnome.org/GNOME/glib/-/issues/1843
static GMutex cur_cb_name_mtx;
static GAsyncQueue *register_cb_done_q;
#define CB_WAIT_TIME (150 * 1000) // microseconds
static void set_cb_name(const char *proto) {
g_mutex_lock(&cur_cb_name_mtx);
cur_cb_name = proto;
g_mutex_unlock(&cur_cb_name_mtx);
}
static void *
register_all_protocols_worker(void *arg _U_)
{
void *volatile error_message = NULL;
TRY {
for (gulong i = 0; i < dissector_reg_proto_count; i++) {
set_cb_name(dissector_reg_proto[i].cb_name);
dissector_reg_proto[i].cb_func();
}
}
CATCH(DissectorError) {
/*
* This is probably a dissector, or something it calls,
* calling REPORT_DISSECTOR_ERROR() in a registration
* routine or something else outside the normal dissection
* code path.
*
* The message gets freed by ENDTRY, so we must make a copy
* of it.
*/
error_message = g_strdup(GET_MESSAGE);
}
ENDTRY;
g_async_queue_push(register_cb_done_q, GINT_TO_POINTER(TRUE));
return (void *) error_message;
}
void
register_all_protocols(register_cb cb, gpointer cb_data)
{
const char *cb_name;
register_cb_done_q = g_async_queue_new();
gboolean called_back = FALSE;
GThread *rapw_thread;
const char *error_message;
rapw_thread = g_thread_new("register_all_protocols_worker", ®ister_all_protocols_worker, NULL);
while (!g_async_queue_timeout_pop(register_cb_done_q, CB_WAIT_TIME)) {
g_mutex_lock(&cur_cb_name_mtx);
cb_name = cur_cb_name;
g_mutex_unlock(&cur_cb_name_mtx);
if (cb && cb_name) {
cb(RA_REGISTER, cb_name, cb_data);
called_back = TRUE;
}
}
error_message = (const char *) g_thread_join(rapw_thread);
if (error_message != NULL)
THROW_MESSAGE(DissectorError, error_message);
if (cb && !called_back) {
cb(RA_REGISTER, "finished", cb_data);
}
}
static void *
register_all_protocol_handoffs_worker(void *arg _U_)
{
void *volatile error_message = NULL;
TRY {
for (gulong i = 0; i < dissector_reg_handoff_count; i++) {
set_cb_name(dissector_reg_handoff[i].cb_name);
dissector_reg_handoff[i].cb_func();
}
}
CATCH(DissectorError) {
/*
* This is probably a dissector, or something it calls,
* calling REPORT_DISSECTOR_ERROR() in a registration
* routine or something else outside the normal dissection
* code path.
*
* The message gets freed by ENDTRY, so we must make a copy
* of it.
*/
error_message = g_strdup(GET_MESSAGE);
}
ENDTRY;
g_async_queue_push(register_cb_done_q, GINT_TO_POINTER(TRUE));
return (void *) error_message;
}
void
register_all_protocol_handoffs(register_cb cb, gpointer cb_data)
{
const char *cb_name;
gboolean called_back = FALSE;
GThread *raphw_thread;
const char *error_message;
set_cb_name(NULL);
raphw_thread = g_thread_new("register_all_protocol_handoffs_worker", ®ister_all_protocol_handoffs_worker, NULL);
while (!g_async_queue_timeout_pop(register_cb_done_q, CB_WAIT_TIME)) {
g_mutex_lock(&cur_cb_name_mtx);
cb_name = cur_cb_name;
g_mutex_unlock(&cur_cb_name_mtx);
if (cb && cb_name) {
cb(RA_HANDOFF, cb_name, cb_data);
called_back = TRUE;
}
}
error_message = (const char *) g_thread_join(raphw_thread);
if (error_message != NULL)
THROW_MESSAGE(DissectorError, error_message);
if (cb && !called_back) {
cb(RA_HANDOFF, "finished", cb_data);
}
g_async_queue_unref(register_cb_done_q);
}
gulong register_count(void)
{
return dissector_reg_proto_count + dissector_reg_handoff_count;
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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