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cnoti.c
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cnoti.c
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#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/un.h>
#include <time.h>
#include <unistd.h>
#include <dbus/dbus.h>
#include "cnoti.h"
#ifndef not
#define not !
#endif
#ifndef and
#define and &&
#endif
#ifndef or
#define or ||
#endif
static bool g_failed = true;
static char g_errstr[128] = "Not started";
static cnoti_callback_type *g_callback = NULL;
static DBusConnection *g_connection;
// Message Processing
static void error(char const *str, ...) {
va_list va;
g_failed = true;
va_start(va, str);
int end = vsnprintf(g_errstr, sizeof(g_errstr), str, va);
va_end(va);
assert(g_errstr[end] != '\n');
}
static void warning(char const *str, ...) {
va_list va;
va_start(va, str);
int end = vsnprintf(g_errstr, sizeof(g_errstr), str, va);
va_end(va);
assert(g_errstr[end] != '\n');
}
static void process_message(DBusMessage *message) {
DBusMessageIter iter;
dbus_message_iter_init(message, &iter);
assert(dbus_message_iter_get_arg_type(&iter) == DBUS_TYPE_STRING);
char *appname;
dbus_message_iter_get_basic(&iter, &appname);
dbus_message_iter_next(&iter);
assert(dbus_message_iter_get_arg_type(&iter) == DBUS_TYPE_UINT32);
uint32_t id;
dbus_message_iter_get_basic(&iter, &id);
dbus_message_iter_next(&iter);
assert(dbus_message_iter_get_arg_type(&iter) == DBUS_TYPE_STRING);
char *icon;
dbus_message_iter_get_basic(&iter, &icon);
dbus_message_iter_next(&iter);
assert(dbus_message_iter_get_arg_type(&iter) == DBUS_TYPE_STRING);
char *summary;
dbus_message_iter_get_basic(&iter, &summary);
dbus_message_iter_next(&iter);
assert(dbus_message_iter_get_arg_type(&iter) == DBUS_TYPE_STRING);
char *body;
dbus_message_iter_get_basic(&iter, &body);
dbus_message_iter_next(&iter);
assert(dbus_message_iter_get_arg_type(&iter) == DBUS_TYPE_ARRAY);
dbus_message_iter_next(&iter);
assert(dbus_message_iter_get_arg_type(&iter) == DBUS_TYPE_ARRAY);
dbus_message_iter_next(&iter);
assert(dbus_message_iter_get_arg_type(&iter) == DBUS_TYPE_INT32);
int32_t timeout;
dbus_message_iter_get_basic(&iter, &timeout);
g_callback(appname, id, icon, summary, body, timeout);
}
static DBusHandlerResult monitor_filter(DBusConnection *connection, DBusMessage *message, void *user_data) {
const char *sender;
sender = dbus_message_get_sender(message);
if (strcmp(sender, "org.freedesktop.DBus") != 0) {
process_message(message);
}
if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
error("cnoti-monitor-filter: Disconnected");
}
return DBUS_HANDLER_RESULT_HANDLED;
}
static dbus_bool_t start_monitor(DBusConnection *connection, char const *filter) {
DBusError err = DBUS_ERROR_INIT;
DBusMessage *new_call_message;
DBusMessage *connection_message;
new_call_message = dbus_message_new_method_call(DBUS_SERVICE_DBUS, DBUS_PATH_DBUS,
DBUS_INTERFACE_MONITORING, "BecomeMonitor");
if (new_call_message == NULL) {
error("cnoti-monitor: Out of memory while registering a monitoring interface.");
return FALSE;
}
DBusMessageIter message_it, filters_it;
dbus_message_iter_init_append(new_call_message, &message_it);
dbus_uint32_t zero = 0;
if (not(dbus_message_iter_open_container(&message_it, DBUS_TYPE_ARRAY, "s", &filters_it) and
dbus_message_iter_append_basic(&filters_it, DBUS_TYPE_STRING, &filter) and
dbus_message_iter_close_container(&message_it, &filters_it) and
dbus_message_iter_append_basic(&message_it, DBUS_TYPE_UINT32, &zero))) {
error("cnoti-monitor: Out of memory while registering the filter array.");
return FALSE;
}
connection_message = dbus_connection_send_with_reply_and_block(connection, new_call_message, -1, &err);
if (connection_message != NULL) {
dbus_message_unref(connection_message);
} else if (dbus_error_has_name(&err, DBUS_ERROR_UNKNOWN_INTERFACE)) {
warning("cnoti-monitor: Failed to enable new-style monitoring. Listening instead.");
dbus_error_free(&err);
} else {
warning("cnoti-monitor: Failed to enable monitoring: %s: \"%s\". Listening instead.", err.name,
err.message);
dbus_error_free(&err);
}
dbus_message_unref(new_call_message);
return (connection_message != NULL);
}
// ----------------
// PUBLIC_INTERFACE
// ----------------
bool cnoti_init(cnoti_callback_type *new_callback) {
DBusError err;
dbus_error_init(&err);
g_errstr[0] = 0;
g_failed = false;
if (new_callback != NULL) {
g_callback = new_callback;
}
assert(g_callback != NULL);
g_connection = dbus_bus_get(DBUS_BUS_SESSION, &err);
if (g_connection == NULL) {
error("Failed to open connection to session bus: %s", err.message);
dbus_error_free(&err);
return false;
}
dbus_connection_set_route_peer_messages(g_connection, TRUE);
if (not dbus_connection_add_filter(g_connection, monitor_filter, NULL, NULL)) {
error("Couldn't add filter!");
return false;
}
if (not start_monitor(g_connection,
"type='method_call',interface='org.freedesktop.Notifications',member='Notify'")) {
if (dbus_error_is_set(&err)) {
error("Failed to start monitor: %s", err.message);
dbus_error_free(&err);
return false;
}
}
return true;
}
bool cnoti_process_events() {
if (g_failed) {
return false;
}
return dbus_connection_read_write_dispatch(g_connection, -1);
}
char const *cnoti_get_error_msg() { return g_errstr[0] == 0 ? NULL : g_errstr; }
char const *cnoti(cnoti_callback_type *callback) {
cnoti_init(callback);
while (cnoti_process_events()) {
}
return cnoti_get_error_msg();
}