66 lines
1.7 KiB
Diff
66 lines
1.7 KiB
Diff
--- ./services/listen_dnsport.c 2014-12-10 10:59:31.726514857 +0100
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+++ ./services/listen_dnsport.c 2014-12-10 11:08:45.009071300 +0100
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@@ -368,29 +368,47 @@
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* (and also uses the interface mtu to determine the size of the packets).
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* So there won't be any EMSGSIZE error. Against DNS fragmentation attacks.
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* FreeBSD already has same semantics without setting the option. */
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-# if defined(IP_PMTUDISC_OMIT)
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- int action = IP_PMTUDISC_OMIT;
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-# else
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- int action = IP_PMTUDISC_DONT;
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-# endif
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+ int omit_set = 0;
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+ int action;
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+# if defined(IP_PMTUDISC_OMIT)
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+ action = IP_PMTUDISC_OMIT;
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if (setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER,
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&action, (socklen_t)sizeof(action)) < 0) {
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- log_err("setsockopt(..., IP_MTU_DISCOVER, "
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-# if defined(IP_PMTUDISC_OMIT)
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- "IP_PMTUDISC_OMIT"
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+
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+ if (errno != EINVAL) {
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+ log_err("setsockopt(..., IP_MTU_DISCOVER, IP_PMTUDISC_OMIT...) failed: %s",
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+ strerror(errno));
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+
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+# ifndef USE_WINSOCK
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+ close(s);
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# else
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- "IP_PMTUDISC_DONT"
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+ closesocket(s);
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# endif
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- "...) failed: %s",
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- strerror(errno));
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+ *noproto = 0;
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+ *inuse = 0;
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+ return -1;
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+ }
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+ }
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+ else
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+ {
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+ omit_set = 1;
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+ }
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+# endif
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+ if (omit_set == 0) {
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+ action = IP_PMTUDISC_DONT;
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+ if (setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER,
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+ &action, (socklen_t)sizeof(action)) < 0) {
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+ log_err("setsockopt(..., IP_MTU_DISCOVER, IP_PMTUDISC_DONT...) failed: %s",
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+ strerror(errno));
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# ifndef USE_WINSOCK
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- close(s);
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+ close(s);
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# else
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- closesocket(s);
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+ closesocket(s);
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# endif
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- *noproto = 0;
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- *inuse = 0;
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- return -1;
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+ *noproto = 0;
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+ *inuse = 0;
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+ return -1;
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+ }
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}
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# elif defined(IP_DONTFRAG)
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int off = 0;
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