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#define DBUS_API_SUBJECT_TO_CHANGE
#include <dbus/dbus.h>
#include <stdbool.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void reply_Bool(DBusMessage* msg, DBusConnection* conn, int value) {
DBusMessage* reply;
DBusMessageIter args;
const char* member = dbus_message_get_member(msg);
dbus_uint32_t serial = 0;
// create a reply from the message
reply = dbus_message_new_method_return(msg);
// add the arguments to the reply
dbus_message_iter_init_append(reply, &args);
if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_BOOLEAN, &value)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: dbus_message_iter_append_basic failed\n", member);
return;
}
// send the reply && flush the connection
if (!dbus_connection_send(conn, reply, &serial)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: dbus_connection_send failed\n", member);
return;
}
dbus_connection_flush(conn);
// free the reply
dbus_message_unref(reply);
}
void reply_CanSetGivenPath(DBusMessage* msg, DBusConnection* conn, const char* param) {
DBusMessage* reply;
DBusMessageIter args;
const char* member = dbus_message_get_member(msg);
dbus_uint32_t serial = 0;
int writable = false;
// check if path is writable
int rval = access (param, W_OK);
if (rval == 0) {
writable = true;
}
// create a reply from the message
reply = dbus_message_new_method_return(msg);
// add the arguments to the reply
dbus_message_iter_init_append(reply, &args);
if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_BOOLEAN, &writable)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: dbus_message_iter_append_basic failed\n", member);
return;
}
// send the reply && flush the connection
if (!dbus_connection_send(conn, reply, &serial)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: dbus_connection_send failed\n", member);
return;
}
dbus_connection_flush(conn);
// free the reply
dbus_message_unref(reply);
}
void reply_SetGivenPath(DBusMessage* msg, DBusConnection* conn, const char* param, const char* contents) {
DBusMessage* reply;
DBusMessageIter args;
const char* member = dbus_message_get_member(msg);
dbus_uint32_t serial = 0;
int writable = false;
int written = false;
// check if path is writable
int rval = access (param, W_OK);
if (rval == 0) {
writable = true;
}
if (writable) {
FILE *node = fopen(param, "w");
if (node != NULL) {
if (fputs(contents, node) != EOF) {
written = true;
}
if (fclose(node) == EOF) {
// Error!
}
}
}
// create a reply from the message
reply = dbus_message_new_method_return(msg);
// add the arguments to the reply
dbus_message_iter_init_append(reply, &args);
if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_BOOLEAN, &written)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: dbus_message_iter_append_basic failed\n", member);
return;
}
// send the reply && flush the connection
if (!dbus_connection_send(conn, reply, &serial)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: dbus_connection_send failed\n", member);
return;
}
dbus_connection_flush(conn);
// free the reply
dbus_message_unref(reply);
}
void reply_CanSetCPUGovernor(DBusMessage* msg, DBusConnection* conn) {
DBusMessageIter args;
const char* member = dbus_message_get_member(msg);
dbus_int32_t cpunum;
char path[256];
// read the arguments
if (!dbus_message_iter_init(msg, &args)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: no argument supplied\n", member);
}
else if (DBUS_TYPE_INT32 != dbus_message_iter_get_arg_type(&args)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: argument not 32-bit integer\n", member);
}
else {
dbus_message_iter_get_basic(&args, &cpunum);
}
snprintf(path, 256, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", cpunum);
reply_CanSetGivenPath(msg, conn, path);
}
void reply_SetCPUGovernor(DBusMessage* msg, DBusConnection* conn) {
DBusMessageIter args;
const char* member = dbus_message_get_member(msg);
dbus_int32_t cpunum = -1;
char* governor = NULL;
char path[256];
// read the arguments
if (!dbus_message_iter_init(msg, &args)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: no arguments supplied\n", member);
}
else if (DBUS_TYPE_INT32 != dbus_message_iter_get_arg_type(&args)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: first argument not 32-bit integer\n", member);
}
else {
dbus_message_iter_get_basic(&args, &cpunum);
}
if (!dbus_message_iter_next(&args)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: second argument not supplied\n", member);
}
else if (DBUS_TYPE_STRING != dbus_message_iter_get_arg_type(&args)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: second argument not string\n", member);
}
else {
dbus_message_iter_get_basic(&args, &governor);
}
snprintf(path, 256, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", cpunum);
if ((cpunum>-1) && governor) {
reply_SetGivenPath(msg, conn, path, governor);
}
else {
reply_Bool(msg, conn, false);
}
}
void reply_CanSetBrightness(DBusMessage* msg, DBusConnection* conn) {
DBusMessageIter args;
const char* member = dbus_message_get_member(msg);
char* rawpath;
char* safepath;
char path[256];
// read the arguments
if (!dbus_message_iter_init(msg, &args)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: no argument supplied\n", member);
}
else if (DBUS_TYPE_STRING != dbus_message_iter_get_arg_type(&args)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: argument not string\n", member);
}
else {
dbus_message_iter_get_basic(&args, &rawpath);
}
safepath = realpath(rawpath, NULL);
if (safepath &&
(strstr(safepath, "/sys/devices") == safepath) &&
(strstr(safepath, "/brightness") == (safepath+strlen(safepath)-strlen("/brightness")))
) {
reply_CanSetGivenPath(msg, conn, safepath);
}
else {
reply_Bool(msg, conn, false);
}
free(safepath);
}
void reply_SetBrightness(DBusMessage* msg, DBusConnection* conn) {
DBusMessageIter args;
const char* member = dbus_message_get_member(msg);
char* rawpath;
char* safepath;
char* brightness;
char path[256];
// read the arguments
if (!dbus_message_iter_init(msg, &args)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: no arguments supplied\n", member);
}
else if (DBUS_TYPE_STRING != dbus_message_iter_get_arg_type(&args)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: first argument not string\n", member);
}
else {
dbus_message_iter_get_basic(&args, &rawpath);
}
if (!dbus_message_iter_next(&args)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: second argument not supplied\n", member);
}
else if (DBUS_TYPE_STRING != dbus_message_iter_get_arg_type(&args)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: second argument not string\n", member);
}
else {
dbus_message_iter_get_basic(&args, &brightness);
}
safepath = realpath(rawpath, NULL);
if (safepath && brightness &&
(strstr(safepath, "/sys/devices") == safepath) &&
(strstr(safepath, "/brightness") == (safepath+strlen(safepath)-strlen("/brightness")))
) {
reply_SetGivenPath(msg, conn, safepath, brightness);
}
else {
reply_Bool(msg, conn, false);
}
free(safepath);
}
void reply_CanSetPower(DBusMessage* msg, DBusConnection* conn, char* state) {
// check if path is writable
int writable = false;
int rval = access ("/sys/power/state", W_OK);
if (rval == 0) {
writable = true;
}
// check if method is supported
int method = false;
if (writable) {
FILE *node = fopen("/sys/power/state", "r");
if (node != NULL) {
char *line = NULL;
size_t len = 0;
ssize_t read = getline(&line, &len, node);
if (line) {
method = strstr(line, state) != NULL;
free(line);
}
if (fclose(node) == EOF) {
// Error!
}
}
}
// send reply
reply_Bool(msg, conn, writable && method);
}
void reply_SetPower(DBusMessage* msg, DBusConnection* conn, char* state) {
// set power state
reply_SetGivenPath(msg, conn, "/sys/power/state", state);
}
void listen() {
DBusMessage* msg;
DBusMessage* reply;
DBusMessageIter args;
DBusConnection* conn;
DBusError err;
int ret;
char* param;
fprintf(stderr, "[tde_dbus_hardwarecontrol] Listening...\n");
// initialise the error structure
dbus_error_init(&err);
// connect to the bus and check for errors
conn = dbus_bus_get(DBUS_BUS_SYSTEM, &err);
if (dbus_error_is_set(&err)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] Connection failed with error '%s'\n", err.message);
dbus_error_free(&err);
}
if (NULL == conn) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] No connection, exiting!\n");
exit(1);
}
// request our name on the bus and check for errors
ret = dbus_bus_request_name(conn, "org.trinitydesktop.hardwarecontrol", DBUS_NAME_FLAG_REPLACE_EXISTING , &err);
if (dbus_error_is_set(&err)) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] Name request failed with error '%s'\n", err.message);
dbus_error_free(&err);
}
if (DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER != ret) {
fprintf(stderr, "[tde_dbus_hardwarecontrol] Not primary owner (%d), exiting!\n", ret);
exit(1);
}
// loop, testing for new messages
while (true) {
// non blocking read of the next available message
dbus_connection_read_write(conn, 1000); // block for up to 1 second
msg = dbus_connection_pop_message(conn);
// loop again if we haven't got a message
if (NULL == msg) {
continue;
}
// check this is a method call for the right interface & method
if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.CPUGovernor", "CanSetCPUGovernor")) {
reply_CanSetCPUGovernor(msg, conn);
}
else if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.CPUGovernor", "SetCPUGovernor")) {
reply_SetCPUGovernor(msg, conn);
}
else if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.Brightness", "CanSetBrightness")) {
reply_CanSetBrightness(msg, conn);
}
else if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.Brightness", "SetBrightness")) {
reply_SetBrightness(msg, conn);
}
else if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.Power", "CanStandby")) {
reply_CanSetPower(msg, conn, "standby");
}
else if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.Power", "Standby")) {
reply_SetPower(msg, conn, "standby");
}
else if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.Power", "CanSuspend")) {
reply_CanSetPower(msg, conn, "mem");
}
else if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.Power", "Suspend")) {
reply_SetPower(msg, conn, "mem");
}
else if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.Power", "CanHibernate")) {
reply_CanSetPower(msg, conn, "disk");
}
else if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.Power", "Hibernate")) {
reply_SetPower(msg, conn, "disk");
}
else {
fprintf(stderr, "[tde_dbus_hardwarecontrol] Unknown method '%s' called on interface '%s', ignoring\n", dbus_message_get_member(msg), dbus_message_get_interface(msg));
}
// free the message
dbus_message_unref(msg);
}
// close the connection
dbus_connection_close(conn);
}
int main(int argc, char** argv) {
listen();
return 0;
}
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