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author | Timmo Verlaan <[email protected]> | 2018-01-29 21:27:22 +0100 |
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committer | Lukas Larsson <[email protected]> | 2018-05-16 17:49:44 +0200 |
commit | 662f3c7ba50ff8ec13d86171bcfc61fd3da9deed (patch) | |
tree | c083608e4f9eb83a4539b5f4a30d1eaf929a0d80 /lib/kernel/src/erl_epmd.erl | |
parent | 0c737f730eccd5716b6d87b0ef690fc7ad02d547 (diff) | |
download | otp-662f3c7ba50ff8ec13d86171bcfc61fd3da9deed.tar.gz otp-662f3c7ba50ff8ec13d86171bcfc61fd3da9deed.tar.bz2 otp-662f3c7ba50ff8ec13d86171bcfc61fd3da9deed.zip |
epmd: allow alternative to dns resolving for nodename
This makes it possible to create a custom integration with a
key-value store for example. The key would then point to the
actual address. You would have to write your own epmd module
to make use of that feature.
Diffstat (limited to 'lib/kernel/src/erl_epmd.erl')
-rw-r--r-- | lib/kernel/src/erl_epmd.erl | 64 |
1 files changed, 61 insertions, 3 deletions
diff --git a/lib/kernel/src/erl_epmd.erl b/lib/kernel/src/erl_epmd.erl index f96bc88913..9a0939972d 100644 --- a/lib/kernel/src/erl_epmd.erl +++ b/lib/kernel/src/erl_epmd.erl @@ -29,10 +29,20 @@ -define(port_please_failure2(Term), noop). -endif. +-ifndef(erlang_daemon_port). +-define(erlang_daemon_port, 4369). +-endif. +-ifndef(epmd_dist_high). +-define(epmd_dist_high, 4370). +-endif. +-ifndef(epmd_dist_low). +-define(epmd_dist_low, 4370). +-endif. + %% External exports -export([start/0, start_link/0, stop/0, port_please/2, port_please/3, names/0, names/1, - register_node/2, register_node/3, open/0, open/1, open/2]). + register_node/2, register_node/3, address_please/3, open/0, open/1, open/2]). %% gen_server callbacks -export([init/1, handle_call/3, handle_cast/2, handle_info/2, @@ -53,7 +63,7 @@ start() -> gen_server:start({local, erl_epmd}, ?MODULE, [], []). - +-spec start_link() -> {ok, pid()} | ignore | {error,term()}. start_link() -> gen_server:start_link({local, erl_epmd}, ?MODULE, [], []). @@ -66,9 +76,22 @@ stop() -> %% return {port, P, Version} | noport %% +-spec port_please(Name, Host) -> {ok, Port, Version} | noport when + Name :: string(), + Host :: inet:ip_address(), + Port :: non_neg_integer(), + Version :: non_neg_integer(). + port_please(Node, Host) -> port_please(Node, Host, infinity). +-spec port_please(Name, Host, Timeout) -> {ok, Port, Version} | noport when + Name :: string(), + Host :: inet:ip_address(), + Timeout :: non_neg_integer() | infinity, + Port :: non_neg_integer(), + Version :: non_neg_integer(). + port_please(Node,HostName, Timeout) when is_atom(HostName) -> port_please1(Node,atom_to_list(HostName), Timeout); port_please(Node,HostName, Timeout) when is_list(HostName) -> @@ -92,10 +115,21 @@ port_please1(Node,HostName, Timeout) -> Else end. +-spec names() -> {ok, [{Name, Port}]} | {error, Reason} when + Name :: string(), + Port :: non_neg_integer(), + Reason :: address | file:posix(). + names() -> {ok, H} = inet:gethostname(), names(H). +-spec names(Host) -> {ok, [{Name, Port}]} | {error, Reason} when + Host :: atom() | string() | inet:ip_address(), + Name :: string(), + Port :: non_neg_integer(), + Reason :: address | file:posix(). + names(HostName) when is_atom(HostName); is_list(HostName) -> case inet:gethostbyname(HostName) of {ok,{hostent, _Name, _ , _Af, _Size, [EpmdAddr | _]}} -> @@ -106,9 +140,22 @@ names(HostName) when is_atom(HostName); is_list(HostName) -> names(EpmdAddr) -> get_names(EpmdAddr). +-spec register_node(Name, Port) -> Result when + Name :: string(), + Port :: non_neg_integer(), + Creation :: non_neg_integer(), + Result :: {ok, Creation} | {error, already_registered} | term(). register_node(Name, PortNo) -> - register_node(Name, PortNo, inet). + register_node(Name, PortNo, inet). + +-spec register_node(Name, Port, Driver) -> Result when + Name :: string(), + Port :: non_neg_integer(), + Driver :: inet_tcp | inet6_tcp | inet | inet6, + Creation :: non_neg_integer(), + Result :: {ok, Creation} | {error, already_registered} | term(). + register_node(Name, PortNo, inet_tcp) -> register_node(Name, PortNo, inet); register_node(Name, PortNo, inet6_tcp) -> @@ -116,6 +163,17 @@ register_node(Name, PortNo, inet6_tcp) -> register_node(Name, PortNo, Family) -> gen_server:call(erl_epmd, {register, Name, PortNo, Family}, infinity). +-spec address_please(Name, Host, AddressFamily) -> Success | {error, term()} when + Name :: string(), + Host :: string() | inet:ip_address(), + AddressFamily :: inet | inet6, + Port :: non_neg_integer(), + Version :: non_neg_integer(), + Success :: {ok, inet:ip_address()} | {ok, inet:ip_address(), Port, Version}. + +address_please(_Name, Host, AddressFamily) -> + inet:getaddr(Host, AddressFamily). + %%%---------------------------------------------------------------------- %%% Callback functions from gen_server %%%---------------------------------------------------------------------- |