Remove I2P support from netbase

I2P apparently needs 256 bits to store a fully routable address. Garlicat
requires a centralized lookup service to map the 80-bit addresses to fully
routable ones (as far as I understood), so that's not really usable in our
situation.

To support I2P routing and peer exchange for it, another solution is needed.
This will most likely imply a network protocol change, and extension of the
'addr' message.

src/netbase.cpp

@@ -29,7 +29,6 @@ enum Network ParseNetwork(std::string net) {
     if (net == "ipv4") return NET_IPV4;
     if (net == "ipv6") return NET_IPV6;
     if (net == "tor")  return NET_TOR;
-    if (net == "i2p")  return NET_I2P;
     return NET_UNROUTABLE;
 }
 
@@ -540,7 +539,6 @@ void CNetAddr::SetIP(const CNetAddr& ipIn)
 }
 
 static const unsigned char pchOnionCat[] = {0xFD,0x87,0xD8,0x7E,0xEB,0x43};
-static const unsigned char pchGarliCat[] = {0xFD,0x60,0xDB,0x4D,0xDD,0xB5};
 
 bool CNetAddr::SetSpecial(const std::string &strName)
 {
@@ -553,15 +551,6 @@ bool CNetAddr::SetSpecial(const std::string &strName)
             ip[i + sizeof(pchOnionCat)] = vchAddr[i];
         return true;
     }
-    if (strName.size()>11 && strName.substr(strName.size() - 11, 11) == ".oc.b32.i2p") {
-        std::vector<unsigned char> vchAddr = DecodeBase32(strName.substr(0, strName.size() - 11).c_str());
-        if (vchAddr.size() != 16-sizeof(pchGarliCat))
-            return false;
-        memcpy(ip, pchOnionCat, sizeof(pchGarliCat));
-        for (unsigned int i=0; i<16-sizeof(pchGarliCat); i++)
-            ip[i + sizeof(pchGarliCat)] = vchAddr[i];
-        return true;
-    }
     return false;
 }
 
@@ -611,7 +600,7 @@ bool CNetAddr::IsIPv4() const
 
 bool CNetAddr::IsIPv6() const
 {
-    return (!IsIPv4() && !IsTor() && !IsI2P());
+    return (!IsIPv4() && !IsTor());
 }
 
 bool CNetAddr::IsRFC1918() const
@@ -675,11 +664,6 @@ bool CNetAddr::IsTor() const
     return (memcmp(ip, pchOnionCat, sizeof(pchOnionCat)) == 0);
 }
 
-bool CNetAddr::IsI2P() const
-{
-    return (memcmp(ip, pchGarliCat, sizeof(pchGarliCat)) == 0);
-}
-
 bool CNetAddr::IsLocal() const
 {
     // IPv4 loopback
@@ -738,7 +722,7 @@ bool CNetAddr::IsValid() const
 
 bool CNetAddr::IsRoutable() const
 {
-    return IsValid() && !(IsRFC1918() || IsRFC3927() || IsRFC4862() || (IsRFC4193() && !IsTor() && !IsI2P()) || IsRFC4843() || IsLocal());
+    return IsValid() && !(IsRFC1918() || IsRFC3927() || IsRFC4862() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsLocal());
 }
 
 enum Network CNetAddr::GetNetwork() const
@@ -752,9 +736,6 @@ enum Network CNetAddr::GetNetwork() const
     if (IsTor())
         return NET_TOR;
 
-    if (IsI2P())
-        return NET_I2P;
-
     return NET_IPV6;
 }
 
@@ -762,8 +743,6 @@ std::string CNetAddr::ToStringIP() const
 {
     if (IsTor())
         return EncodeBase32(&ip[6], 10) + ".onion";
-    if (IsI2P())
-        return EncodeBase32(&ip[6], 10) + ".oc.b32.i2p";
     CService serv(*this, 0);
 #ifdef USE_IPV6
     struct sockaddr_storage sockaddr;
@@ -871,12 +850,6 @@ std::vector<unsigned char> CNetAddr::GetGroup() const
         nStartByte = 6;
         nBits = 4;
     }
-    else if (IsI2P())
-    {
-        nClass = NET_I2P;
-        nStartByte = 6;
-        nBits = 4;
-    }
     // for he.net, use /36 groups
     else if (GetByte(15) == 0x20 && GetByte(14) == 0x11 && GetByte(13) == 0x04 && GetByte(12) == 0x70)
         nBits = 36;
@@ -962,11 +935,6 @@ int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const
         case NET_IPV4:   return REACH_IPV4; // Tor users can connect to IPv4 as well
         case NET_TOR:    return REACH_PRIVATE;
         }
-    case NET_I2P:
-        switch(ourNet) {
-        default:         return REACH_DEFAULT;
-        case NET_I2P:    return REACH_PRIVATE;
-        }
     case NET_TEREDO:
         switch(ourNet) {
         default:          return REACH_DEFAULT;
@@ -982,8 +950,7 @@ int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const
         case NET_TEREDO:  return REACH_TEREDO;
         case NET_IPV6:    return REACH_IPV6_WEAK;
         case NET_IPV4:    return REACH_IPV4;
-        case NET_I2P:     return REACH_PRIVATE; // assume connections from unroutable addresses are
-        case NET_TOR:     return REACH_PRIVATE; // either from Tor/I2P, or don't care about our address
+        case NET_TOR:     return REACH_PRIVATE; // either from Tor, or don't care about our address
         }
     }
 }
@@ -1140,7 +1107,7 @@ std::string CService::ToStringPort() const
 
 std::string CService::ToStringIPPort() const
 {
-    if (IsIPv4() || IsTor() || IsI2P()) {
+    if (IsIPv4() || IsTor()) {
         return ToStringIP() + ":" + ToStringPort();
     } else {
         return "[" + ToStringIP() + "]:" + ToStringPort();

src/netbase.h

@@ -23,7 +23,6 @@ enum Network
     NET_IPV4,
     NET_IPV6,
     NET_TOR,
-    NET_I2P,
 
     NET_MAX,
 };
@@ -44,9 +43,9 @@ class CNetAddr
         explicit CNetAddr(const std::string &strIp, bool fAllowLookup = false);
         void Init();
         void SetIP(const CNetAddr& ip);
-        bool SetSpecial(const std::string &strName); // for Tor and I2P addresses
+        bool SetSpecial(const std::string &strName); // for Tor addresses
         bool IsIPv4() const;    // IPv4 mapped address (::FFFF:0:0/96, 0.0.0.0/0)
-        bool IsIPv6() const;    // IPv6 address (not mapped IPv4, not Tor/I2P)
+        bool IsIPv6() const;    // IPv6 address (not mapped IPv4, not Tor)
         bool IsRFC1918() const; // IPv4 private networks (10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12)
         bool IsRFC3849() const; // IPv6 documentation address (2001:0DB8::/32)
         bool IsRFC3927() const; // IPv4 autoconfig (169.254.0.0/16)
@@ -58,7 +57,6 @@ class CNetAddr
         bool IsRFC6052() const; // IPv6 well-known prefix (64:FF9B::/96)
         bool IsRFC6145() const; // IPv6 IPv4-translated address (::FFFF:0:0:0/96)
         bool IsTor() const;
-        bool IsI2P() const;
         bool IsLocal() const;
         bool IsRoutable() const;
         bool IsValid() const;