diameter_tcp(3)

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diameter_tcp Diameter transport over TCP.

This module implements diameter transport over TCP using gen_tcp. It can be specified as the value of a transport_module option to diameter:add_transport/2 and implements the behaviour documented in diameter_transport(3). TLS security is supported, both as an upgrade following capabilities exchange as specified by RFC 3588 and at connection establishment as in the current draft standard.

start({Type, Ref}, Svc, [Opt]) -> {ok, Pid, [LAddr]} | {error, Reason} Start a transport process. Type = connect | accept Ref = reference() Svc = #diameter_service{} Opt = OwnOpt | SslOpt | OtherOpt Pid = pid() LAddr = ip_address() Reason = term() OwnOpt = {raddr, ip_address()} | {rport, integer()} | {port, integer()} SslOpt = {ssl_options, true | list()} OtherOpt = term()

The start function required by diameter_transport(3).

The only diameter_tcp-specific argument is the options list. Options raddr and rport specify the remote address and port for a connecting transport and are not valid for a listening transport. Option ssl_options must be specified for a transport that must be able to support TLS: a value of true results in a TLS handshake immediately upon connection establishment while list() specifies options to be passed to ssl:connect/2 of ssl:ssl_accept/2 after capabilities exchange if TLS is negotiated. Remaining options are any accepted by ssl:connect/3 or gen_tcp:connect/3 for a connecting transport, or ssl:listen/3 or gen_tcp:listen/2 for a listening transport, depending on whether or not {ssl_options, true} has been specified. Options binary, packet and active cannot be specified. Also, option port can be specified for a listening transport to specify the local listening port, the default being the standardized 3868 if unspecified. Note that option ip specifies the local address.

An ssl_options list must be specified if and only if the transport in question has specified an Inband-Security-Id AVP with value TLS on the relevant call to start_service/2 or add_transport/2, so that the transport process will receive notification of whether or not to commence with a TLS handshake following capabilities exchange. Failing to specify an options list on a TLS-capable transport for which TLS is negotiated will cause TLS handshake to fail. Failing to specify TLS capability when ssl_options has been specified will cause the transport process to wait for a notification that will not be forthcoming, which will eventually cause the RFC 3539 watchdog to take down the connection.

If the service specifies more than one Host-IP-Address and option ip is unspecified then then the first of the service's addresses is used as the local address.

The returned local address list has length one.