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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" #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) 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 // 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 // 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) // 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) { if (!home) {
return; return;
} }
char path[2048]; NSString *path = [[[[[[home stringByAppendingPathComponent:@"Library"]
sprintf(path, "%s/Library/Application Support/discord", home); stringByAppendingPathComponent:@"Application Support"]
Mkdir(path); stringByAppendingPathComponent:@"discord"]
strcat(path, "/games"); stringByAppendingPathComponent:@"games"]
Mkdir(path); stringByAppendingPathComponent:[NSString stringWithUTF8String:applicationId]]
strcat(path, "/"); stringByAppendingPathExtension:@"json"];
strcat(path, applicationId); [[NSFileManager defaultManager] createDirectoryAtPath:[path stringByDeletingLastPathComponent] withIntermediateDirectories:YES attributes:nil error:nil];
strcat(path, ".json");
FILE* f = fopen(path, "w"); NSString *jsonBuffer = [NSString stringWithFormat:@"{\"command\": \"%s\"}", command];
if (f) { [jsonBuffer writeToFile:path atomically:NO encoding:NSUTF8StringEncoding error:nil];
char jsonBuffer[2048];
int len = snprintf(jsonBuffer, sizeof(jsonBuffer), "{\"command\": \"%s\"}", command);
fwrite(jsonBuffer, (size_t)len, 1, f);
fclose(f);
}
} }
static void RegisterURL(const char* applicationId) static void RegisterURL(const char* applicationId)
@ -83,15 +66,15 @@ void Discord_Register(const char* applicationId, const char* command)
} }
else { else {
// raii lite // raii lite
void* pool = [[NSAutoreleasePool alloc] init]; @autoreleasepool {
RegisterURL(applicationId); RegisterURL(applicationId);
[(id)pool drain]; }
} }
} }
void Discord_RegisterSteamGame(const char* applicationId, const char* steamId) void Discord_RegisterSteamGame(const char* applicationId, const char* steamId)
{ {
char command[256]; char command[256];
sprintf(command, "steam://rungameid/%s", steamId); snprintf(command, 256, "steam://rungameid/%s", steamId);
Discord_Register(applicationId, command); Discord_Register(applicationId, command);
} }