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XOR IP addresses before sending them to Discord

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Not complex because we aren't sending anything that isn't easily accessible via the Master Server anyway, just means we aren't sending plain-text IPs to Discord. Might be improved by basing the XOR key on other values (base RNG, maybe version) so that it's not like *right* there
This commit is contained in:
Sally Coolatta 2020-08-21 01:16:11 -04:00
parent 1bf0794d6a
commit 6a86d86828
2 changed files with 40 additions and 11 deletions
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49
src/discord.c
View file

@ -34,6 +34,8 @@
consvar_t cv_discordrp = {"discordrp", "On", CV_SAVE|CV_CALL, CV_OnOff, DRPC_UpdatePresence, 0, NULL, NULL, 0, 0, NULL};
#define IP_SIZE 16 // length of IP strings
#ifdef HAVE_CURL
struct SelfIPbuffer
{
@ -42,14 +44,34 @@ struct SelfIPbuffer
size_t length;
};
#define IP_SIZE 16
static char self_ip[IP_SIZE];
#endif // HAVE_CURL
/*--------------------------------------------------
static char *DRPC_XORIPString(const char *input)
Simple XOR encryption/decryption. Not complex or
very secretive because we aren't sending anything
that isn't easily accessible via the Master Server anyway.
--------------------------------------------------*/
static char *DRPC_XORIPString(const char *input)
{
const UINT8 xor[IP_SIZE] = {222, 106, 64, 251, 207, 16, 28, 78, 4, 118, 46, 76, 153, 45, 91, 100};
char *output = malloc(sizeof(char) * IP_SIZE);
UINT8 i;
for (i = 0; i < IP_SIZE; i++)
{
output[i] = input[i] ^ xor[i];
}
return output;
}
/*--------------------------------------------------
static void DRPC_HandleReady(const DiscordUser *user)
Handler function, ran when the game connects to Discord.
Callback function, ran when the game connects to Discord.
Input Arguments:-
user - Struct containing Discord user info.
@ -65,7 +87,7 @@ static void DRPC_HandleReady(const DiscordUser *user)
/*--------------------------------------------------
static void DRPC_HandleDisconnect(int err, const char *msg)
Handler function, ran when disconnecting from Discord.
Callback function, ran when disconnecting from Discord.
Input Arguments:-
err - Error type
@ -82,7 +104,7 @@ static void DRPC_HandleDisconnect(int err, const char *msg)
/*--------------------------------------------------
static void DRPC_HandleError(int err, const char *msg)
Handler function, ran when Discord outputs an error.
Callback function, ran when Discord outputs an error.
Input Arguments:-
err - Error type
@ -99,7 +121,7 @@ static void DRPC_HandleError(int err, const char *msg)
/*--------------------------------------------------
static void DRPC_HandleJoin(const char *secret)
Handler function, ran when Discord wants to
Callback function, ran when Discord wants to
connect a player to the game via a channel invite
or a join request.
@ -111,8 +133,10 @@ static void DRPC_HandleError(int err, const char *msg)
--------------------------------------------------*/
static void DRPC_HandleJoin(const char *secret)
{
CONS_Printf("Connecting to %s via Discord\n", secret);
COM_BufAddText(va("connect \"%s\"\n", secret));
char *ip = DRPC_XORIPString(secret);
CONS_Printf("Connecting to %s via Discord\n", ip);
COM_BufAddText(va("connect \"%s\"\n", ip));
free(ip);
}
/*--------------------------------------------------
@ -129,6 +153,7 @@ void DRPC_Init(void)
handlers.disconnected = DRPC_HandleDisconnect;
handlers.errored = DRPC_HandleError;
handlers.joinGame = DRPC_HandleJoin;
//handlers.joinRequest = DRPC_HandleJoinRequest;
Discord_Initialize(DISCORD_APPID, &handlers, 1, NULL);
I_AddExitFunc(Discord_Shutdown);
@ -275,8 +300,8 @@ void DRPC_UpdatePresence(void)
#ifdef DEVELOP
// This way, we can use the invite feature in-dev, but not have snoopers seeing any potential secrets! :P
discordPresence.largeImageKey = "miscdevelop";
discordPresence.largeImageText = "Nope.";
discordPresence.state = "Shh! We're testing!";
discordPresence.largeImageText = "No peeking!";
discordPresence.state = "Testing the game";
Discord_UpdatePresence(&discordPresence);
return;
@ -304,7 +329,11 @@ void DRPC_UpdatePresence(void)
// Grab the host's IP for joining.
if (cv_allownewplayer.value && ((join = DRPC_GetServerIP()) != NULL))
discordPresence.joinSecret = join;
{
char *xorjoin = DRPC_XORIPString(join);
discordPresence.joinSecret = xorjoin;
free(xorjoin);
}
}
else
{

2
src/discord.h
View file

@ -23,7 +23,7 @@ extern consvar_t cv_discordrp;
void DRPC_Init(void);
Initalizes Discord Rich Presence by linking the Application ID
and setting the handler functions.
and setting the callback functions.
--------------------------------------------------*/
void DRPC_Init(void);