From cfb3464c6e64618ff106babb98ccddb258b2fec5 Mon Sep 17 00:00:00 2001
From: Christoph Lohmann <20h@r-36.net>
Date: Thu, 23 Dec 2021 22:11:08 +0100
Subject: [PATCH] Reduce effective buffer size per channel input.

This will curb the easy way to trigger a too long line sent to the
server and prevent this error and connection drop.
---
 ii.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/ii.c b/ii.c
index 1b3bb9e..2d485aa 100644
--- a/ii.c
+++ b/ii.c
@@ -683,7 +683,14 @@ read_line(int fd, char *buf, size_t bufsiz)
 static void
 handle_channels_input(int ircfd, Channel *c)
 {
-	char buf[IRC_MSG_MAX];
+	/*
+	 * Do not allow to read this fully, since commands will be
+	 * prepended. It will result in too long lines sent to the
+	 * server.
+	 * TODO: Make this depend on the maximum metadata given by the
+	 * server at the beginning of the connection.
+	 */
+	char buf[IRC_MSG_MAX-64];
 
 	if (read_line(c->fdin, buf, sizeof(buf)) == -1) {
 		if (channel_reopen(c) == -1)