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From 858da540f70a4411ad8fbe7144cef6ce9da18f89 Mon Sep 17 00:00:00 2001
From: wouter <wouter@be551aaa-1e26-0410-a405-d3ace91eadb9>
Date: Mon, 5 Jan 2015 13:51:22 +0000
Subject: [PATCH] - Fix #634: fix fail to start on Linux LTS 3.14.X, ignores
missing IP_MTU_DISCOVER OMIT option.
--- a/services/listen_dnsport.c
+++ b/services/listen_dnsport.c
@@ -368,29 +368,47 @@ create_udp_sock(int family, int socktype, struct sockaddr* addr,
* (and also uses the interface mtu to determine the size of the packets).
* So there won't be any EMSGSIZE error. Against DNS fragmentation attacks.
* FreeBSD already has same semantics without setting the option. */
-# if defined(IP_PMTUDISC_OMIT)
- int action = IP_PMTUDISC_OMIT;
-# else
- int action = IP_PMTUDISC_DONT;
-# endif
+ int omit_set = 0;
+ int action;
+# if defined(IP_PMTUDISC_OMIT)
+ action = IP_PMTUDISC_OMIT;
if (setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER,
&action, (socklen_t)sizeof(action)) < 0) {
- log_err("setsockopt(..., IP_MTU_DISCOVER, "
-# if defined(IP_PMTUDISC_OMIT)
- "IP_PMTUDISC_OMIT"
+
+ if (errno != EINVAL) {
+ log_err("setsockopt(..., IP_MTU_DISCOVER, IP_PMTUDISC_OMIT...) failed: %s",
+ strerror(errno));
+
+# ifndef USE_WINSOCK
+ close(s);
# else
- "IP_PMTUDISC_DONT"
+ closesocket(s);
# endif
- "...) failed: %s",
- strerror(errno));
+ *noproto = 0;
+ *inuse = 0;
+ return -1;
+ }
+ }
+ else
+ {
+ omit_set = 1;
+ }
+# endif
+ if (omit_set == 0) {
+ action = IP_PMTUDISC_DONT;
+ if (setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER,
+ &action, (socklen_t)sizeof(action)) < 0) {
+ log_err("setsockopt(..., IP_MTU_DISCOVER, IP_PMTUDISC_DONT...) failed: %s",
+ strerror(errno));
# ifndef USE_WINSOCK
- close(s);
+ close(s);
# else
- closesocket(s);
+ closesocket(s);
# endif
- *noproto = 0;
- *inuse = 0;
- return -1;
+ *noproto = 0;
+ *inuse = 0;
+ return -1;
+ }
}
# elif defined(IP_DONTFRAG)
int off = 0;
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