File fix-upstream-disable-udp-default.patch of Package memcached.openSUSE_Leap_42.3_Update

commit dbb7a8af90054bf4ef51f5814ef7ceb17d83d974
Author: dormando <dormando@rydia.net>
Date:   Tue Feb 27 10:50:45 2018 -0800

    disable UDP port by default
    
    As reported, UDP amplification attacks have started to use insecure
    internet-exposed memcached instances. UDP used to be a lot more popular as a
    transport for memcached many years ago, but I'm not aware of many recent
    users.
    
    Ten years ago, the TCP connection overhead from many clients was relatively
    high (dozens or hundreds per client server), but these days many clients are
    batched, or user fewer processes, or simply anre't worried about it.
    
    While changing the default to listen on localhost only would also help, the
    true culprit is UDP. There are many more use cases for using memcached over
    the network than there are for using the UDP protocol.

Index: memcached-1.4.39/memcached.c
===================================================================
--- memcached-1.4.39.orig/memcached.c
+++ memcached-1.4.39/memcached.c
@@ -205,7 +205,7 @@ static void settings_init(void) {
     settings.use_cas = true;
     settings.access = 0700;
     settings.port = 11211;
-    settings.udpport = 11211;
+    settings.udpport = 0;
     /* By default this string should be NULL for getaddrinfo() */
     settings.inter = NULL;
     settings.maxbytes = 64 * 1024 * 1024; /* default is 64MB */
@@ -6524,9 +6524,7 @@ int main (int argc, char **argv) {
         }
     }
 
-    if (tcp_specified && !udp_specified) {
-        settings.udpport = settings.port;
-    } else if (udp_specified && !tcp_specified) {
+    if (udp_specified && settings.udpport != 0 && !tcp_specified) {
         settings.port = settings.udpport;
     }
 
Index: memcached-1.4.39/t/issue_67.t
===================================================================
--- memcached-1.4.39.orig/t/issue_67.t
+++ memcached-1.4.39/t/issue_67.t
@@ -73,7 +73,7 @@ sub when {
 
 # Disabling the defaults since it conflicts with a running instance.
 # when('no arguments', '', 11211, 11211);
-when('specifying tcp port', '-p 11212', 11212, 11212);
+when('specifying tcp port', '-p 11212', 11212, -1);
 when('specifying udp port', '-U 11222', 11222, 11222);
 when('specifying tcp ephemeral port', '-p -1', 0, 0);
 when('specifying udp ephemeral port', '-U -1', 0, 0);