From eda3d9248971a1c3df6e6c4b23ba89be30508b51 Mon Sep 17 00:00:00 2001
From: mruddy <mruddy@users.noreply.github.com>
Date: Tue, 5 Apr 2016 22:26:38 +0000
Subject: [PATCH] Net: Add IPv6 Link-Local Address Support

---
 src/netbase.cpp | 10 +++++++---
 src/netbase.h   |  3 ++-
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/netbase.cpp b/src/netbase.cpp
index 7f79dd02c6..281c6bcb7f 100644
--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -170,7 +170,8 @@ bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsign
         if (aiTrav->ai_family == AF_INET6)
         {
             assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in6));
-            vIP.push_back(CNetAddr(((struct sockaddr_in6*)(aiTrav->ai_addr))->sin6_addr));
+            struct sockaddr_in6* s6 = (struct sockaddr_in6*) aiTrav->ai_addr;
+            vIP.push_back(CNetAddr(s6->sin6_addr, s6->sin6_scope_id));
         }
 
         aiTrav = aiTrav->ai_next;
@@ -629,6 +630,7 @@ bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest
 void CNetAddr::Init()
 {
     memset(ip, 0, sizeof(ip));
+    scopeId = 0;
 }
 
 void CNetAddr::SetIP(const CNetAddr& ipIn)
@@ -678,9 +680,10 @@ CNetAddr::CNetAddr(const struct in_addr& ipv4Addr)
     SetRaw(NET_IPV4, (const uint8_t*)&ipv4Addr);
 }
 
-CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr)
+CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr, const uint32_t scope)
 {
     SetRaw(NET_IPV6, (const uint8_t*)&ipv6Addr);
+    scopeId = scope;
 }
 
 CNetAddr::CNetAddr(const char *pszIp, bool fAllowLookup)
@@ -1099,7 +1102,7 @@ CService::CService(const struct sockaddr_in& addr) : CNetAddr(addr.sin_addr), po
     assert(addr.sin_family == AF_INET);
 }
 
-CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr), port(ntohs(addr.sin6_port))
+CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr, addr.sin6_scope_id), port(ntohs(addr.sin6_port))
 {
    assert(addr.sin6_family == AF_INET6);
 }
@@ -1192,6 +1195,7 @@ bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const
         memset(paddrin6, 0, *addrlen);
         if (!GetIn6Addr(&paddrin6->sin6_addr))
             return false;
+        paddrin6->sin6_scope_id = scopeId;
         paddrin6->sin6_family = AF_INET6;
         paddrin6->sin6_port = htons(port);
         return true;
diff --git a/src/netbase.h b/src/netbase.h
index 1db66ac27f..db736154fa 100644
--- a/src/netbase.h
+++ b/src/netbase.h
@@ -44,6 +44,7 @@ class CNetAddr
 {
     protected:
         unsigned char ip[16]; // in network byte order
+        uint32_t scopeId; // for scoped/link-local ipv6 addresses
 
     public:
         CNetAddr();
@@ -89,7 +90,7 @@ class CNetAddr
         std::vector<unsigned char> GetGroup() const;
         int GetReachabilityFrom(const CNetAddr *paddrPartner = NULL) const;
 
-        CNetAddr(const struct in6_addr& pipv6Addr);
+        CNetAddr(const struct in6_addr& pipv6Addr, const uint32_t scope = 0);
         bool GetIn6Addr(struct in6_addr* pipv6Addr) const;
 
         friend bool operator==(const CNetAddr& a, const CNetAddr& b);