Need C++ API to provide client address.

[fengli-google]

Need C++ API to provide client ip/port for trusted ip checking, visibility checking, etc.
Also need API to get server ip/port for convenient.

[ctiller]

We need to think carefully about what format we expose here - at some point I expect to need to support some form of non-IP based transport.

[pmarks-net]

How does this new feature interact with dualstack sockets? Will users see an IPv4 address (1.2.3.4) or a mapped IPv6 address (::ffff:1.2.3.4)?

Mapped addresses are a private implementation detail of the socket API, which should never be leaked to an API user unless they have raw access to the file descriptor.

[pmarks-net]

Looks like ctiller@1b22b9d replaced the normalizing grpc_sockaddr_to_string(&addr_str, addr, 1); with the non-normalizing grpc_sockaddr_to_uri(addr) :-(

[yang-g]

FWIW, the user sees the mapped address now.