Node support for Tor hidden services

This commit adds support for .onion addresses (mapped into the IPv6
by using OnionCat's range and encoding), and the ability to connect
to them via a SOCKS5 proxy.

1 files changed, 76 insertions, 15 deletions

diff --git a/src/netbase.cpp b/src/netbase.cpp
index ffd3ea68a..21fca4737 100644
--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -57,6 +57,15 @@ void SplitHostPort(std::string in, int &portOut, std::string &hostOut) {
 bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
 {
     vIP.clear();
+
+    {
+        CNetAddr addr;
+        if (addr.SetSpecial(std::string(pszName))) {
+            vIP.push_back(addr);
+            return true;
+        }
+    }
+
     struct addrinfo aiHint;
     memset(&aiHint, 0, sizeof(struct addrinfo));
 
@@ -530,6 +539,32 @@ void CNetAddr::SetIP(const CNetAddr& ipIn)
     memcpy(ip, ipIn.ip, sizeof(ip));
 }
 
+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)
+{
+    if (strName.size()>6 && strName.substr(strName.size() - 6, 6) == ".onion") {
+        std::vector<unsigned char> vchAddr = DecodeBase32(strName.substr(0, strName.size() - 6).c_str());
+        if (vchAddr.size() != 16-sizeof(pchOnionCat))
+            return false;
+        memcpy(ip, pchOnionCat, sizeof(pchOnionCat));
+        for (unsigned int i=0; i<16-sizeof(pchOnionCat); i++)
+            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;
+}
+
 CNetAddr::CNetAddr()
 {
     Init();
@@ -576,7 +611,7 @@ bool CNetAddr::IsIPv4() const
 
 bool CNetAddr::IsIPv6() const
 {
-    return (!IsIPv4());
+    return (!IsIPv4() && !IsTor() && !IsI2P());
 }
 
 bool CNetAddr::IsRFC1918() const
@@ -635,15 +670,13 @@ bool CNetAddr::IsRFC4843() const
     return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10);
 }
 
-bool CNetAddr::IsOnionCat() const
+bool CNetAddr::IsTor() const
 {
-    static const unsigned char pchOnionCat[] = {0xFD,0x87,0xD8,0x7E,0xEB,0x43};
     return (memcmp(ip, pchOnionCat, sizeof(pchOnionCat)) == 0);
 }
 
-bool CNetAddr::IsGarliCat() const
+bool CNetAddr::IsI2P() const
 {
-    static const unsigned char pchGarliCat[] = {0xFD,0x60,0xDB,0x4D,0xDD,0xB5};
     return (memcmp(ip, pchGarliCat, sizeof(pchGarliCat)) == 0);
 }
 
@@ -705,7 +738,7 @@ bool CNetAddr::IsValid() const
 
 bool CNetAddr::IsRoutable() const
 {
-    return IsValid() && !(IsRFC1918() || IsRFC3927() || IsRFC4862() || (IsRFC4193() && !IsOnionCat() && !IsGarliCat()) || IsRFC4843() || IsLocal());
+    return IsValid() && !(IsRFC1918() || IsRFC3927() || IsRFC4862() || (IsRFC4193() && !IsTor() && !IsI2P()) || IsRFC4843() || IsLocal());
 }
 
 enum Network CNetAddr::GetNetwork() const
@@ -716,10 +749,10 @@ enum Network CNetAddr::GetNetwork() const
     if (IsIPv4())
         return NET_IPV4;
 
-    if (IsOnionCat())
+    if (IsTor())
         return NET_TOR;
 
-    if (IsGarliCat())
+    if (IsI2P())
         return NET_I2P;
 
     return NET_IPV6;
@@ -727,6 +760,10 @@ enum Network CNetAddr::GetNetwork() const
 
 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;
@@ -739,7 +776,7 @@ std::string CNetAddr::ToStringIP() const
         if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), NULL, 0, NI_NUMERICHOST))
             return std::string(name);
     }
-    if (IsIPv4()) 
+    if (IsIPv4())
         return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));
     else
         return strprintf("%x:%x:%x:%x:%x:%x:%x:%x",
@@ -828,6 +865,18 @@ std::vector<unsigned char> CNetAddr::GetGroup() const
         vchRet.push_back(GetByte(2) ^ 0xFF);
         return vchRet;
     }
+    else if (IsTor())
+    {
+        nClass = NET_TOR;
+        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;
@@ -861,11 +910,11 @@ void CNetAddr::print() const
     printf("CNetAddr(%s)\n", ToString().c_str());
 }
 
-// for IPv6 partners:        for unknown/Teredo partners:      for IPv4 partners:
-// 0 - unroutable            // 0 - unroutable                 // 0 - unroutable
-// 1 - teredo                // 1 - teredo                     // 1 - ipv4
-// 2 - tunneled ipv6         // 2 - tunneled ipv6
-// 3 - ipv4                  // 3 - ipv6
+// for IPv6 partners:        for unknown/Teredo partners:      for IPv4 partners:     for Tor partners:     for I2P partners:
+// 0 - unroutable            // 0 - unroutable                 // 0 - unroutable      // 0 - unroutable     // 0 - unroutable
+// 1 - teredo                // 1 - teredo                     // 1 - ipv4            // 1 - the rest       // 1 - the rest
+// 2 - tunneled ipv6         // 2 - tunneled ipv6                                     // 2 - ip4            // 2 - I2P
+// 3 - ipv4                  // 3 - ipv6                                              // 3 - tor
 // 4 - ipv6                  // 4 - ipv4
 int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const
 {
@@ -873,6 +922,18 @@ int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const
         return 0;
     if (paddrPartner && paddrPartner->IsIPv4())
         return IsIPv4() ? 1 : 0;
+    if (paddrPartner && paddrPartner->IsTor()) {
+        if (IsIPv4())
+            return 2;
+        if (IsTor())
+            return 3;
+        return 1;
+    }
+    if (paddrPartner && paddrPartner->IsI2P()) {
+        if (IsI2P())
+            return 2;
+        return 1;
+    }
     if (IsRFC4380())
         return 1;
     if (IsRFC3964() || IsRFC6052())
@@ -1036,7 +1097,7 @@ std::string CService::ToStringPort() const
 
 std::string CService::ToStringIPPort() const
 {
-    if (IsIPv4()) {
+    if (IsIPv4() || IsTor() || IsI2P()) {
         return ToStringIP() + ":" + ToStringPort();
     } else {
         return "[" + ToStringIP() + "]:" + ToStringPort();