From ca46c321915798818d6716fb5c2be9f538f2e722 Mon Sep 17 00:00:00 2001
From: David Härdeman <david@hardeman.nu>
Date: Thu, 11 Jun 2020 12:29:43 +0200
Subject: Add some socket options to minecraft protocol sockets

---
 utils.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'utils.c')

diff --git a/utils.c b/utils.c
index 39f91f1..93bc0b8 100644
--- a/utils.c
+++ b/utils.c
@@ -8,6 +8,9 @@
 #include <dirent.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
 
 #include "main.h"
 #include "utils.h"
@@ -155,6 +158,30 @@ debug_resource_usage()
 	}
 }
 
+void
+socket_set_gaming_options(struct cfg *cfg, int sfd)
+{
+	int option;
+
+	if (sfd <= 0)
+		return;
+
+	/* FIXME: could make this configurable */
+	option = true;
+	if (setsockopt(sfd, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option)) < 0)
+		perror("setsockopt");
+
+	/* Doubtful if it has much effect, but can't hurt */
+	option = IPTOS_LOWDELAY;
+	if (setsockopt(sfd, IPPROTO_IP, IP_TOS, &option, sizeof(option)) < 0)
+		perror("setsockopt");
+
+	/* Nagle's algorithm is a poor fit for gaming */
+	option = true;
+	if (setsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, &option, sizeof(option)) < 0)
+		perror("setsockopt");
+}
+
 uint16_t sockaddr_port(struct sockaddr_in46 *addr)
 {
 	switch (addr->storage.ss_family) {
-- 
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