From 2cc50bdb10c0a7849763ae1dfa37ca7707299a16 Mon Sep 17 00:00:00 2001
From: Adam Ierymenko <adam.ierymenko@gmail.com>
Date: Mon, 9 Nov 2015 15:44:13 -0800
Subject: Try bringing back TTL escalation -- may help with Docker (IP-MASQ)
 type NAT

---
 osdep/Phy.hpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'osdep')

diff --git a/osdep/Phy.hpp b/osdep/Phy.hpp
index 8dde279c..1ba6c40b 100644
--- a/osdep/Phy.hpp
+++ b/osdep/Phy.hpp
@@ -414,6 +414,24 @@ public:
 		return (PhySocket *)&sws;
 	}
 
+	/**
+	 * Set the IP TTL for the next outgoing packet (for IPv4 UDP sockets only)
+	 *
+	 * @param ttl New TTL (0 or >255 will set it to 255)
+	 * @return True on success
+	 */
+	inline bool setIp4UdpTtl(PhySocket *sock,unsigned int ttl)
+	{
+		PhySocketImpl &sws = *(reinterpret_cast<PhySocketImpl *>(sock));
+#if defined(_WIN32) || defined(_WIN64)
+		DWORD tmp = ((ttl == 0)||(ttl > 255)) ? 255 : (DWORD)ttl;
+		return (::setsockopt(sws.sock,IPPROTO_IP,IP_TTL,(const char *)&tmp,sizeof(tmp)) == 0);
+#else
+		int tmp = ((ttl == 0)||(ttl > 255)) ? 255 : (int)ttl;
+		return (::setsockopt(sws.sock,IPPROTO_IP,IP_TTL,(void *)&tmp,sizeof(tmp)) == 0);
+#endif
+	}
+
 	/**
 	 * Send a UDP packet
 	 *
-- 
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