Add IPv6 support

new cli options (RPC ones also apply to wallet):
  --p2p-bind-ipv6-address (default = "::")
  --p2p-bind-port-ipv6    (default same as ipv4 port for given nettype)
  --rpc-bind-ipv6-address (default = "::1")

  --p2p-use-ipv6          (default false)
  --rpc-use-ipv6          (default false)

  --p2p-require-ipv4      (default true, if ipv4 bind fails and this is
                           true, will not continue even if ipv6 bind
                           successful)
  --rpc-require-ipv4      (default true, description as above)

ipv6 addresses are to be specified as "[xx:xx:xx::xx:xx]:port" except
in the cases of the cli args for bind address.  For those the square
braces can be omitted.

1 files changed, 50 insertions, 9 deletions

diff --git a/src/net/parse.cpp b/src/net/parse.cpp
index d93d7d352..7b74f2b75 100644
--- a/src/net/parse.cpp
+++ b/src/net/parse.cpp
@@ -34,28 +34,69 @@
 
 namespace net
 {
+    void get_network_address_host_and_port(const std::string& address, std::string& host, std::string& port)
+    {
+        // require ipv6 address format "[addr:addr:addr:...:addr]:port"
+        if (address.find(']') != std::string::npos)
+        {
+            host = address.substr(1, address.rfind(']') - 1);
+            if ((host.size() + 2) < address.size())
+            {
+                port = address.substr(address.rfind(':') + 1);
+            }
+        }
+        else
+        {
+            host = address.substr(0, address.rfind(':'));
+            if (host.size() < address.size())
+            {
+                port = address.substr(host.size() + 1);
+            }
+        }
+    }
+
     expect<epee::net_utils::network_address>
     get_network_address(const boost::string_ref address, const std::uint16_t default_port)
     {
-        const boost::string_ref host = address.substr(0, address.rfind(':'));
+        std::string host_str = "";
+        std::string port_str = "";
+
+        bool ipv6 = false;
+
+        get_network_address_host_and_port(std::string(address), host_str, port_str);
 
-        if (host.empty())
+        boost::string_ref host_str_ref(host_str);
+        boost::string_ref port_str_ref(port_str);
+
+        if (host_str.empty())
             return make_error_code(net::error::invalid_host);
-        if (host.ends_with(".onion"))
+        if (host_str_ref.ends_with(".onion"))
             return tor_address::make(address, default_port);
-        if (host.ends_with(".i2p"))
+        if (host_str_ref.ends_with(".i2p"))
             return i2p_address::make(address, default_port);
 
+        boost::system::error_code ec;
+        boost::asio::ip::address_v6 v6 = boost::asio::ip::make_address_v6(host_str, ec);
+        ipv6 = !ec;
+
         std::uint16_t port = default_port;
-        if (host.size() < address.size())
+        if (port_str.size())
         {
-            if (!epee::string_tools::get_xtype_from_string(port, std::string{address.substr(host.size() + 1)}))
+            if (!epee::string_tools::get_xtype_from_string(port, port_str))
                 return make_error_code(net::error::invalid_port);
         }
 
-        std::uint32_t ip = 0;
-        if (epee::string_tools::get_ip_int32_from_string(ip, std::string{host}))
-            return {epee::net_utils::ipv4_network_address{ip, port}};
+        if (ipv6)
+        {
+            return {epee::net_utils::ipv6_network_address{v6, port}};
+        }
+        else
+        {
+            std::uint32_t ip = 0;
+            if (epee::string_tools::get_ip_int32_from_string(ip, host_str))
+                return {epee::net_utils::ipv4_network_address{ip, port}};
+        }
+
         return make_error_code(net::error::unsupported_address);
     }