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Fix buffer overflows in RegisterCommand on mac (#99)

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Glenn Smith 2018-01-05 19:59:44 -05:00 committed by Ben Morse
parent 839ba32671
commit 2c609b1d5f
1 changed files with 15 additions and 32 deletions
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47
src/discord_register_osx.m
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@ -5,45 +5,28 @@
#include "discord_register.h"
static bool Mkdir(const char* path)
{
int result = mkdir(path, 0755);
if (result == 0) {
return true;
}
if (errno == EEXIST) {
return true;
}
return false;
}
static void RegisterCommand(const char* applicationId, const char* command)
{
// There does not appear to be a way to register arbitrary commands on OSX, so instead we'll save the command
// to a file in the Discord config path, and when it is needed, Discord can try to load the file there, open
// the command therein (will pass to js's window.open, so requires a url-like thing)
const char* home = getenv("HOME");
// Note: will not work for sandboxed apps
NSString *home = NSHomeDirectory();
if (!home) {
return;
}
char path[2048];
sprintf(path, "%s/Library/Application Support/discord", home);
Mkdir(path);
strcat(path, "/games");
Mkdir(path);
strcat(path, "/");
strcat(path, applicationId);
strcat(path, ".json");
NSString *path = [[[[[[home stringByAppendingPathComponent:@"Library"]
stringByAppendingPathComponent:@"Application Support"]
stringByAppendingPathComponent:@"discord"]
stringByAppendingPathComponent:@"games"]
stringByAppendingPathComponent:[NSString stringWithUTF8String:applicationId]]
stringByAppendingPathExtension:@"json"];
[[NSFileManager defaultManager] createDirectoryAtPath:[path stringByDeletingLastPathComponent] withIntermediateDirectories:YES attributes:nil error:nil];
FILE* f = fopen(path, "w");
if (f) {
char jsonBuffer[2048];
int len = snprintf(jsonBuffer, sizeof(jsonBuffer), "{\"command\": \"%s\"}", command);
fwrite(jsonBuffer, (size_t)len, 1, f);
fclose(f);
}
NSString *jsonBuffer = [NSString stringWithFormat:@"{\"command\": \"%s\"}", command];
[jsonBuffer writeToFile:path atomically:NO encoding:NSUTF8StringEncoding error:nil];
}
static void RegisterURL(const char* applicationId)
@ -83,15 +66,15 @@ void Discord_Register(const char* applicationId, const char* command)
}
else {
// raii lite
void* pool = [[NSAutoreleasePool alloc] init];
RegisterURL(applicationId);
[(id)pool drain];
@autoreleasepool {
RegisterURL(applicationId);
}
}
}
void Discord_RegisterSteamGame(const char* applicationId, const char* steamId)
{
char command[256];
sprintf(command, "steam://rungameid/%s", steamId);
snprintf(command, 256, "steam://rungameid/%s", steamId);
Discord_Register(applicationId, command);
}