mirror of
https://github.com/FeralInteractive/gamemode.git
synced 2025-06-07 08:07:20 +02:00
e90bd98d64
This exposed a bunch of issues that needed dealing with to ensure the code is clean and sane. Notably the dlopen/dlsym routine has been altered to closer match the LSI approach of safe symbol binding, by not attempting to directly cast the result of a dlsym operation. Instead, if we succeed in getting the dlsym() pointer, we memcpy this to the target and ensure we have the correct constraints. Note that in sanitizing the log helpers, I opted to remove the varargs ability from FATAL_ERRNO given this is used exactly like perror() and there are no examples currently using varargs with this in the tree. This allowed me to keep the log helpers as macros and not have to implement wrapper functions. Signed-off-by: Ikey Doherty <ikey@solus-project.com>
105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/*
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Copyright (c) 2017, Feral Interactive
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Feral Interactive nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <dlfcn.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <systemd/sd-bus.h>
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#include <unistd.h>
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// Storage for error strings
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static char error_string[512] = { 0 };
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// Simple requestor function for a gamemode
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static int gamemode_request(const char *function)
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{
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sd_bus_message *msg = NULL;
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sd_bus *bus = NULL;
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int result = -1;
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// Open the user bus
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int ret = sd_bus_open_user(&bus);
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if (ret < 0) {
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snprintf(error_string,
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sizeof(error_string),
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"Could not connect to bus: %s",
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strerror(-ret));
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} else {
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// Attempt to send the requested function
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ret = sd_bus_call_method(bus,
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"com.feralinteractive.GameMode",
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"/com/feralinteractive/GameMode",
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"com.feralinteractive.GameMode",
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function,
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NULL,
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&msg,
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"i",
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getpid());
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if (ret < 0) {
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snprintf(error_string,
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sizeof(error_string),
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"Could not call method on bus: %s",
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strerror(-ret));
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} else {
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// Read the reply
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ret = sd_bus_message_read(msg, "i", &result);
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if (ret < 0) {
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snprintf(error_string,
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sizeof(error_string),
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"Failure to parse response: %s",
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strerror(-ret));
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}
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}
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}
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return result;
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}
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// Get the error string
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extern const char *real_gamemode_error_string(void)
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{
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return error_string;
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}
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// Wrapper to call RegisterGame
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extern int real_gamemode_request_start(void)
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{
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return gamemode_request("RegisterGame");
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}
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// Wrapper to call UnregisterGame
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extern int real_gamemode_request_end(void)
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{
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return gamemode_request("UnregisterGame");
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}
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