From 6d5bcf72c10f7b648c7c605c3cd7ff6dcf9b7b17 Mon Sep 17 00:00:00 2001
From: "C. McEnroe" <june@causal.agency>
Date: Thu, 27 May 2021 11:45:47 -0400
Subject: [PATCH] Hash the username in kiosk mode

So that the first part of $SSH_CLIENT can be passed as username.
---
 catgirl.1 | 4 +++-
 chat.c    | 8 ++++++++
 chat.h    | 9 ++++++---
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/catgirl.1 b/catgirl.1
index 2ba5377..fd9e696 100644
--- a/catgirl.1
+++ b/catgirl.1
@@ -1,4 +1,4 @@
-.Dd March 17, 2021
+.Dd May 27, 2021
 .Dt CATGIRL 1
 .Os
 .
@@ -148,6 +148,8 @@ Disable the
 .Ic /query ,
 .Ic /quote
 commands.
+Replace the username
+with a hash of its original value.
 .
 .It Fl N Ar util , Cm notify = Ar util
 Send notifications using a utility.
diff --git a/chat.c b/chat.c
index 7335520..23ad335 100644
--- a/chat.c
+++ b/chat.c
@@ -28,6 +28,7 @@
 #include <err.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <inttypes.h>
 #include <limits.h>
 #include <locale.h>
 #include <poll.h>
@@ -268,6 +269,13 @@ int main(int argc, char *argv[]) {
 	if (!user) user = nick;
 	if (!real) real = nick;
 
+	if (self.kiosk) {
+		char *hash;
+		int n = asprintf(&hash, "%8" PRIx32, _hash(user));
+		if (n < 0) err(EX_OSERR, "asprintf");
+		user = hash;
+	}
+
 	// Modes defined in RFC 1459:
 	set(&network.chanTypes, "#&");
 	set(&network.prefixes, "@+");
diff --git a/chat.h b/chat.h
index fadbc30..44ec9b8 100644
--- a/chat.h
+++ b/chat.h
@@ -138,8 +138,7 @@ static inline uint idFor(const char *name) {
 
 extern uint32_t hashInit;
 extern uint32_t hashBound;
-static inline enum Color hash(const char *str) {
-	if (hashBound < Blue) return Default;
+static inline uint32_t _hash(const char *str) {
 	if (*str == '~') str++;
 	uint32_t hash = hashInit;
 	for (; *str; ++str) {
@@ -147,7 +146,11 @@ static inline enum Color hash(const char *str) {
 		hash ^= *str;
 		hash *= 0x27220A95;
 	}
-	return Blue + hash % (hashBound + 1 - Blue);
+	return hash;
+}
+static inline enum Color hash(const char *str) {
+	if (hashBound < Blue) return Default;
+	return Blue + _hash(str) % (hashBound + 1 - Blue);
 }
 
 extern struct Network {