%%----------------------------------------------------------------------
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2012-2013. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%----------------------------------------------------------------------
%% File: ct_netconfc.erl
%%
%% Description:
%% This file contains the Netconf client interface
%%
%% @author Support
%%
%% @doc Netconf client module.
%%
%% <p>The Netconf client is compliant with RFC4741 and RFC4742.</p>
%%
%% <p> For each server to test against, the following entry can be
%% added to a configuration file:</p>
%%
%% <p>`{server_id(),options()}.'</p>
%%
%% <p> The `server_id()' or an associated `target_name()' (see
%% {@link ct}) shall then be used in calls to {@link open/2}.</p>
%%
%% <p>If no configuration exists for a server, a session can still be
%% opened by calling {@link open/2} with all necessary options given
%% in the call. The first argument to {@link open/2} can then be any
%% atom.</p>
%%
%% == Logging ==
%%
%% The netconf server uses the `error_logger' for logging of netconf
%% traffic. A special purpose error handler is implemented in
%% `ct_conn_log_h'. To use this error handler, add the `cth_conn_log'
%% hook in your test suite, e.g.
%%
%% ```
%% suite() ->
%% [{ct_hooks, [{cth_conn_log, [{conn_mod(),hook_options()}]}]}].
%%'''
%%
%% The `conn_mod()' is the name of the common_test module implementing
%% the connection protocol, e.g. `ct_netconfc'.
%%
%% The hook option `log_type' specifies the type of logging:
%%
%% <dl>
%% <dt>`raw'</dt>
%% <dd>The sent and received netconf data is logged to a separate
%% text file as is without any formatting. A link to the file is
%% added to the test case HTML log.</dd>
%%
%% <dt>`pretty'</dt>
%% <dd>The sent and received netconf data is logged to a separate
%% text file with XML data nicely indented. A link to the file is
%% added to the test case HTML log.</dd>
%%
%% <dt>`html (default)'</dt>
%% <dd>The sent and received netconf traffic is pretty printed
%% directly in the test case HTML log.</dd>
%%
%% <dt>`silent'</dt>
%% <dd>Netconf traffic is not logged.</dd>
%% </dl>
%%
%% By default, all netconf traffic is logged in one single log
%% file. However, it is possible to have different connections logged
%% in separate files. To do this, use the hook option `hosts' and
%% list the names of the servers/connections that will be used in the
%% suite. Note that the connections must be named for this to work,
%% i.e. they must be opened with {@link open/2}.
%%
%% The `hosts' option has no effect if `log_type' is set to `html' or
%% `silent'.
%%
%% The hook options can also be specified in a configuration file with
%% the configuration variable `ct_conn_log':
%%
%% ```
%% {ct_conn_log,[{conn_mod(),hook_options()}]}.
%% '''
%%
%% For example:
%%
%% ```
%% {ct_conn_log,[{ct_netconfc,[{log_type,pretty},
%% {hosts,[key_or_name()]}]}]}
%% '''
%%
%% <b>Note</b> that hook options specified in a configuration file
%% will overwrite the hardcoded hook options in the test suite.
%%
%% === Logging example 1 ===
%%
%% The following `ct_hooks' statement will cause pretty printing of
%% netconf traffic to separate logs for the connections named
%% `nc_server1' and `nc_server2'. Any other connections will be logged
%% to default netconf log.
%%
%% ```
%% suite() ->
%% [{ct_hooks, [{cth_conn_log, [{ct_netconfc,[{log_type,pretty}},
%% {hosts,[nc_server1,nc_server2]}]}
%% ]}]}].
%%'''
%%
%% Connections must be opened like this:
%%
%% ```
%% open(nc_server1,[...]),
%% open(nc_server2,[...]).
%% '''
%%
%% === Logging example 2 ===
%%
%% The following configuration file will cause raw logging of all
%% netconf traffic into one single text file.
%%
%% ```
%% {ct_conn_log,[{ct_netconfc,[{log_type,raw}]}]}.
%% '''
%%
%% The `ct_hooks' statement must look like this:
%%
%% ```
%% suite() ->
%% [{ct_hooks, [{cth_conn_log, []}]}].
%% '''
%%
%% The same `ct_hooks' statement without the configuration file would
%% cause HTML logging of all netconf connections into the test case
%% HTML log.
%%
%% == Notifications ==
%%
%% The netconf client is also compliant with RFC5277 NETCONF Event
%% Notifications, which defines a mechanism for an asynchronous
%% message notification delivery service for the netconf protocol.
%%
%% Specific functions to support this are {@link
%% create_subscription/6} and {@link get_event_streams/3}. (The
%% functions also exist with other arities.)
%%
%% @end
%%----------------------------------------------------------------------
-module(ct_netconfc).
-include("ct_netconfc.hrl").
-include("ct_util.hrl").
-include_lib("xmerl/include/xmerl.hrl").
%%----------------------------------------------------------------------
%% External exports
%%----------------------------------------------------------------------
-export([open/1,
open/2,
only_open/1,
only_open/2,
hello/1,
hello/2,
close_session/1,
close_session/2,
kill_session/2,
kill_session/3,
send/2,
send/3,
send_rpc/2,
send_rpc/3,
lock/2,
lock/3,
unlock/2,
unlock/3,
get/2,
get/3,
get_config/3,
get_config/4,
edit_config/3,
edit_config/4,
delete_config/2,
delete_config/3,
copy_config/3,
copy_config/4,
action/2,
action/3,
create_subscription/1,
create_subscription/2,
create_subscription/3,
create_subscription/4,
create_subscription/5,
create_subscription/6,
get_event_streams/2,
get_event_streams/3,
get_capabilities/1,
get_capabilities/2,
get_session_id/1,
get_session_id/2]).
%%----------------------------------------------------------------------
%% Exported types
%%----------------------------------------------------------------------
-export_type([hook_options/0,
conn_mod/0,
log_type/0,
key_or_name/0,
notification/0]).
%%----------------------------------------------------------------------
%% Internal exports
%%----------------------------------------------------------------------
%% ct_gen_conn callbacks
-export([init/3,
handle_msg/3,
handle_msg/2,
terminate/2,
close/1]).
%% ct_conn_log callback
-export([format_data/2]).
%%----------------------------------------------------------------------
%% Internal defines
%%----------------------------------------------------------------------
-define(APPLICATION,?MODULE).
-define(VALID_SSH_OPTS,[user, password, user_dir]).
-define(DEFAULT_STREAM,"NETCONF").
-define(error(ConnName,Report),
error_logger:error_report([{ct_connection,ConnName},
{client,self()},
{module,?MODULE},
{line,?LINE} |
Report])).
-define(is_timeout(T), (is_integer(T) orelse T==infinity)).
-define(is_filter(F),
(is_atom(F) orelse (is_tuple(F) andalso is_atom(element(1,F))))).
-define(is_string(S), (is_list(S) andalso is_integer(hd(S)))).
%%----------------------------------------------------------------------
%% Records
%%----------------------------------------------------------------------
%% Client state
-record(state, {host,
port,
connection, % #connection
capabilities,
session_id,
msg_id = 1,
hello_status,
buff = <<>>,
pending = [], % [#pending]
event_receiver}).% pid
%% Run-time client options.
-record(options, {ssh = [], % Options for the ssh application
host,
port = ?DEFAULT_PORT,
timeout = ?DEFAULT_TIMEOUT,
name}).
%% Connection reference
-record(connection, {reference, % {CM,Ch}
host,
port,
name}).
%% Pending replies from server
-record(pending, {tref, % timer ref (returned from timer:xxx)
ref, % pending ref
msg_id,
op,
caller}).% pid which sent the request
%%----------------------------------------------------------------------
%% Type declarations
%%----------------------------------------------------------------------
-type client() :: handle() | server_id() | target_name().
-type handle() :: term().
%% An opaque reference for a connection (netconf session). See {@link
%% ct} for more information.
-type server_id() :: atom().
%% A `ServerId' which exists in a configuration file.
-type target_name() :: atom().
%% A name which is associated to a `server_id()' via a
%% `require' statement or a call to {@link ct:require/2} in the
%% test suite.
-type key_or_name() :: server_id() | target_name().
-type options() :: [option()].
%% Options used for setting up ssh connection to a netconf server.
-type option() :: {ssh,host()} | {port,inet:port_number()} | {user,string()} |
{password,string()} | {user_dir,string()} |
{timeout,timeout()}.
-type host() :: inet:hostname() | inet:ip_address().
-type notification() :: {notification, xml_attributes(), notification_content()}.
-type notification_content() :: [event_time()|simple_xml()].
-type event_time() :: {eventTime,xml_attributes(),[xs_datetime()]}.
-type stream_name() :: string().
-type streams() :: [{stream_name(),[stream_data()]}].
-type stream_data() :: {description,string()} |
{replaySupport,string()} |
{replayLogCreationTime,string()} |
{replayLogAgedTime,string()}.
%% See XML Schema for Event Notifications found in RFC5277 for further
%% detail about the data format for the string values.
-type hook_options() :: [hook_option()].
%% Options that can be given to `cth_conn_log' in the `ct_hook' statement.
-type hook_option() :: {log_type,log_type()} |
{hosts,[key_or_name()]}.
-type log_type() :: raw | pretty | html | silent.
%-type error_handler() :: module().
-type conn_mod() :: ct_netconfc.
-type error_reason() :: term().
-type simple_xml() :: {xml_tag(), xml_attributes(), xml_content()} |
{xml_tag(), xml_content()} |
xml_tag().
%% <p>This type is further described in the documentation for the
%% <tt>Xmerl</tt> application.</p>
-type xml_tag() :: atom().
-type xml_attributes() :: [{xml_attribute_tag(),xml_attribute_value()}].
-type xml_attribute_tag() :: atom().
-type xml_attribute_value() :: string().
-type xml_content() :: [simple_xml() | iolist()].
-type xpath() :: {xpath,string()}.
-type netconf_db() :: running | startup | candidate.
-type xs_datetime() :: string().
%% This date and time identifyer has the same format as the XML type
%% dateTime and compliant to RFC3339. The format is
%% ```[-]CCYY-MM-DDThh:mm:ss[.s][Z|(+|-)hh:mm]'''
%%----------------------------------------------------------------------
%% External interface functions
%%----------------------------------------------------------------------
%%----------------------------------------------------------------------
-spec open(Options) -> Result when
Options :: options(),
Result :: {ok,handle()} | {error,error_reason()}.
%% @doc Open a netconf session and exchange `hello' messages.
%%
%% If the server options are specified in a configuration file, or if
%% a named client is needed for logging purposes (see {@section
%% Logging}) use {@link open/2} instead.
%%
%% The opaque `handler()' reference which is returned from this
%% function is required as client identifier when calling any other
%% function in this module.
%%
%% The `timeout' option (milli seconds) is used when setting up
%% the ssh connection and when waiting for the hello message from the
%% server. It is not used for any other purposes during the lifetime
%% of the connection.
%%
%% @end
%%----------------------------------------------------------------------
open(Options) ->
open(Options,#options{},[],true).
%%----------------------------------------------------------------------
-spec open(KeyOrName, ExtraOptions) -> Result when
KeyOrName :: key_or_name(),
ExtraOptions :: options(),
Result :: {ok,handle()} | {error,error_reason()}.
%% @doc Open a named netconf session and exchange `hello' messages.
%%
%% If `KeyOrName' is a configured `server_id()' or a
%% `target_name()' associated with such an ID, then the options
%% for this server will be fetched from the configuration file.
%
%% The `ExtraOptions' argument will be added to the options found in
%% the configuration file. If the same options are given, the values
%% from the configuration file will overwrite `ExtraOptions'.
%%
%% If the server is not specified in a configuration file, use {@link
%% open/1} instead.
%%
%% The opaque `handle()' reference which is returned from this
%% function can be used as client identifier when calling any other
%% function in this module. However, if `KeyOrName' is a
%% `target_name()', i.e. if the server is named via a call to
%% `ct:require/2' or a `require' statement in the test
%% suite, then this name may be used instead of the `handle()'.
%%
%% The `timeout' option (milli seconds) is used when setting up
%% the ssh connection and when waiting for the hello message from the
%% server. It is not used for any other purposes during the lifetime
%% of the connection.
%%
%% @see ct:require/2
%% @end
%%----------------------------------------------------------------------
open(KeyOrName, ExtraOpts) ->
open(KeyOrName, ExtraOpts, true).
open(KeyOrName, ExtraOpts, Hello) ->
SortedExtra = lists:keysort(1,ExtraOpts),
SortedConfig = lists:keysort(1,ct:get_config(KeyOrName,[])),
AllOpts = lists:ukeymerge(1,SortedConfig,SortedExtra),
open(AllOpts,#options{name=KeyOrName},[{name,KeyOrName}],Hello).
open(OptList,InitOptRec,NameOpt,Hello) ->
case check_options(OptList,undefined,undefined,InitOptRec) of
{Host,Port,Options} ->
case ct_gen_conn:start({Host,Port},Options,?MODULE,
NameOpt ++ [{reconnect,false},
{use_existing_connection,false},
{forward_messages,true}]) of
{ok,Client} when Hello==true ->
case hello(Client,Options#options.timeout) of
ok ->
{ok,Client};
Error ->
Error
end;
Other ->
Other
end;
Error ->
Error
end.
%%----------------------------------------------------------------------
-spec only_open(Options) -> Result when
Options :: options(),
Result :: {ok,handle()} | {error,error_reason()}.
%% @doc Open a netconf session, but don't send `hello'.
%%
%% As {@link open/1} but does not send a `hello' message.
%%
%% @end
%%----------------------------------------------------------------------
only_open(Options) ->
open(Options,#options{},[],false).
%%----------------------------------------------------------------------
-spec only_open(KeyOrName,ExtraOptions) -> Result when
KeyOrName :: key_or_name(),
ExtraOptions :: options(),
Result :: {ok,handle()} | {error,error_reason()}.
%% @doc Open a name netconf session, but don't send `hello'.
%%
%% As {@link open/2} but does not send a `hello' message.
%%
%% @end
%%----------------------------------------------------------------------
only_open(KeyOrName, ExtraOpts) ->
open(KeyOrName, ExtraOpts, false).
%%----------------------------------------------------------------------
%% @spec hello(Client) -> Result
%% @equiv hello(Client, infinity)
hello(Client) ->
hello(Client,?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec hello(Client,Timeout) -> Result when
Client :: handle(),
Timeout :: timeout(),
Result :: ok | {error,error_reason()}.
%% @doc Exchange `hello' messages with the server.
%%
%% Sends a `hello' message to the server and waits for the return.
%%
%% @end
%%----------------------------------------------------------------------
hello(Client,Timeout) ->
call(Client, {hello, Timeout}).
%%----------------------------------------------------------------------
%% @spec get_session_id(Client) -> Result
%% @equiv get_session_id(Client, infinity)
get_session_id(Client) ->
get_session_id(Client, ?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec get_session_id(Client, Timeout) -> Result when
Client :: client(),
Timeout :: timeout(),
Result :: pos_integer() | {error,error_reason()}.
%% @doc Returns the session id associated with the given client.
%%
%% @end
%%----------------------------------------------------------------------
get_session_id(Client, Timeout) ->
call(Client, get_session_id, Timeout).
%%----------------------------------------------------------------------
%% @spec get_capabilities(Client) -> Result
%% @equiv get_capabilities(Client, infinity)
get_capabilities(Client) ->
get_capabilities(Client, ?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec get_capabilities(Client, Timeout) -> Result when
Client :: client(),
Timeout :: timeout(),
Result :: [string()] | {error,error_reason()}.
%% @doc Returns the server side capabilities
%%
%% The following capability identifiers, defined in RFC 4741, can be returned:
%%
%% <ul>
%% <li>`"urn:ietf:params:netconf:base:1.0"'</li>
%% <li>`"urn:ietf:params:netconf:capability:writable-running:1.0"'</li>
%% <li>`"urn:ietf:params:netconf:capability:candidate:1.0"'</li>
%% <li>`"urn:ietf:params:netconf:capability:confirmed-commit:1.0"'</li>
%% <li>`"urn:ietf:params:netconf:capability:rollback-on-error:1.0"'</li>
%% <li>`"urn:ietf:params:netconf:capability:startup:1.0"'</li>
%% <li>`"urn:ietf:params:netconf:capability:url:1.0"'</li>
%% <li>`"urn:ietf:params:netconf:capability:xpath:1.0"'</li>
%% </ul>
%%
%% Note, additional identifiers may exist, e.g. server side namespace.
%%
%% @end
%%----------------------------------------------------------------------
get_capabilities(Client, Timeout) ->
call(Client, get_capabilities, Timeout).
%%----------------------------------------------------------------------
%% @spec send(Client, SimpleXml) -> Result
%% @equiv send(Client, SimpleXml, infinity)
send(Client, SimpleXml) ->
send(Client, SimpleXml, ?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec send(Client, SimpleXml, Timeout) -> Result when
Client :: client(),
SimpleXml :: simple_xml(),
Timeout :: timeout(),
Result :: ok | {error,error_reason()}.
%% @doc Send an XML document to the server.
%%
%% The given XML document is sent as is to the server. This function
%% can be used for sending XML documents that can not be expressed by
%% other interface functions in this module.
send(Client, SimpleXml, Timeout) ->
call(Client,{send, Timeout, SimpleXml}).
%%----------------------------------------------------------------------
%% @spec send_rpc(Client, SimpleXml) -> Result
%% @equiv send_rpc(Client, SimpleXml, infinity)
send_rpc(Client, SimpleXml) ->
send_rpc(Client, SimpleXml, ?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec send_rpc(Client, SimpleXml, Timeout) -> Result when
Client :: client(),
SimpleXml :: simple_xml(),
Timeout :: timeout(),
Result :: ok | {error,error_reason()}.
%% @doc Send a Netconf <code>rpc</code> request to the server.
%%
%% The given XML document is wrapped in a valid Netconf
%% <code>rpc</code> request and sent to the server. The
%% <code>message-id</code> and namespace attributes are added to the
%% <code>rpc</code> element.
%%
%% This function can be used for sending <code>rpc</code> requests
%% that can not be expressed by other interface functions in this
%% module.
send_rpc(Client, SimpleXml, Timeout) ->
call(Client,{send_rpc, SimpleXml, Timeout}).
%%----------------------------------------------------------------------
%% @spec lock(Client, Target) -> Result
%% @equiv lock(Client, Target, infinity)
lock(Client, Target) ->
lock(Client, Target,?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec lock(Client, Target, Timeout) -> Result when
Client :: client(),
Target :: netconf_db(),
Timeout :: timeout(),
Result :: ok | {error,error_reason()}.
%% @doc Unlock configuration target.
%%
%% Which target parameters that can be used depends on if
%% `:candidate' and/or `:startup' are supported by the
%% server. If successfull, the configuration system of the device is
%% not available to other clients (Netconf, CORBA, SNMP etc). Locks
%% are intended to be short-lived.
%%
%% The operations {@link kill_session/2} or {@link kill_session/3} can
%% be used to force the release of a lock owned by another Netconf
%% session. How this is achieved by the server side is implementation
%% specific.
%%
%% @end
%%----------------------------------------------------------------------
lock(Client, Target, Timeout) ->
call(Client,{send_rpc_op,lock,[Target],Timeout}).
%%----------------------------------------------------------------------
%% @spec unlock(Client, Target) -> Result
%% @equiv unlock(Client, Target, infinity)
unlock(Client, Target) ->
unlock(Client, Target,?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec unlock(Client, Target, Timeout) -> Result when
Client :: client(),
Target :: netconf_db(),
Timeout :: timeout(),
Result :: ok | {error,error_reason()}.
%% @doc Unlock configuration target.
%%
%% If the client earlier has aquired a lock, via {@link lock/2} or
%% {@link lock/3}, this operation release the associated lock. To be
%% able to access another target than `running', the server must
%% support `:candidate' and/or `:startup'.
%%
%% @end
%%----------------------------------------------------------------------
unlock(Client, Target, Timeout) ->
call(Client, {send_rpc_op, unlock, [Target], Timeout}).
%%----------------------------------------------------------------------
%% @spec get(Client, Filter) -> Result
%% @equiv get(Client, Filter, infinity)
get(Client, Filter) ->
get(Client, Filter, ?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec get(Client, Filter, Timeout) -> Result when
Client :: client(),
Filter :: simple_xml() | xpath(),
Timeout :: timeout(),
Result :: {ok,simple_xml()} | {error,error_reason()}.
%% @doc Get data.
%%
%% This operation returns both configuration and state data from the
%% server.
%%
%% Filter type `xpath' can only be used if the server supports
%% `:xpath'.
%%
%% @end
%%----------------------------------------------------------------------
get(Client, Filter, Timeout) ->
call(Client,{send_rpc_op, get, [Filter], Timeout}).
%%----------------------------------------------------------------------
%% @spec get_config(Client, Source, Filter) -> Result
%% @equiv get_config(Client, Source, Filter, infinity)
get_config(Client, Source, Filter) ->
get_config(Client, Source, Filter, ?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec get_config(Client, Source, Filter, Timeout) -> Result when
Client :: client(),
Source :: netconf_db(),
Filter :: simple_xml() | xpath(),
Timeout :: timeout(),
Result :: {ok,simple_xml()} | {error,error_reason()}.
%% @doc Get configuration data.
%%
%% To be able to access another source than `running', the server
%% must advertise `:candidate' and/or `:startup'.
%%
%% Filter type `xpath' can only be used if the server supports
%% `:xpath'.
%%
%%
%% @end
%%----------------------------------------------------------------------
get_config(Client, Source, Filter, Timeout) ->
call(Client, {send_rpc_op, get_config, [Source, Filter], Timeout}).
%%----------------------------------------------------------------------
%% @spec edit_config(Client, Target, Config) -> Result
%% @equiv edit_config(Client, Target, Config, infinity)
edit_config(Client, Target, Config) ->
edit_config(Client, Target, Config, ?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec edit_config(Client, Target, Config, Timeout) -> Result when
Client :: client(),
Target :: netconf_db(),
Config :: simple_xml(),
Timeout :: timeout(),
Result :: ok | {error,error_reason()}.
%% @doc Edit configuration data.
%%
%% Per default only the running target is available, unless the server
%% include `:candidate' or `:startup' in its list of
%% capabilities.
%%
%% @end
%%----------------------------------------------------------------------
edit_config(Client, Target, Config, Timeout) ->
call(Client, {send_rpc_op, edit_config, [Target,Config], Timeout}).
%%----------------------------------------------------------------------
%% @spec delete_config(Client, Target) -> Result
%% @equiv delete_config(Client, Target, infinity)
delete_config(Client, Target) ->
delete_config(Client, Target, ?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec delete_config(Client, Target, Timeout) -> Result when
Client :: client(),
Target :: startup | candidate,
Timeout :: timeout(),
Result :: ok | {error,error_reason()}.
%% @doc Delete configuration data.
%%
%% The running configuration cannot be deleted and `:candidate'
%% or `:startup' must be advertised by the server.
%%
%% @end
%%----------------------------------------------------------------------
delete_config(Client, Target, Timeout) when Target == startup;
Target == candidate ->
call(Client,{send_rpc_op, delete_config, [Target], Timeout}).
%%----------------------------------------------------------------------
%% @spec copy_config(Client, Source, Target) -> Result
%% @equiv copy_config(Client, Source, Target, infinity)
copy_config(Client, Source, Target) ->
copy_config(Client, Source, Target, ?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec copy_config(Client, Target, Source, Timeout) -> Result when
Client :: client(),
Target :: netconf_db(),
Source :: netconf_db(),
Timeout :: timeout(),
Result :: ok | {error,error_reason()}.
%% @doc Copy configuration data.
%%
%% Which source and target options that can be issued depends on the
%% capabilities supported by the server. I.e. `:candidate' and/or
%% `:startup' are required.
%%
%% @end
%%----------------------------------------------------------------------
copy_config(Client, Target, Source, Timeout) ->
call(Client,{send_rpc_op, copy_config, [Target, Source], Timeout}).
%%----------------------------------------------------------------------
%% @spec action(Client, Action) -> Result
%% @equiv action(Client, Action, infinity)
action(Client,Action) ->
action(Client,Action,?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec action(Client, Action, Timeout) -> Result when
Client :: client(),
Action :: simple_xml(),
Timeout :: timeout(),
Result :: {ok,simple_xml()} | {error,error_reason()}.
%% @doc Execute an action.
%%
%% @end
%%----------------------------------------------------------------------
action(Client,Action,Timeout) ->
call(Client,{send_rpc_op, action, [Action], Timeout}).
%%----------------------------------------------------------------------
create_subscription(Client) ->
create_subscription(Client,?DEFAULT_STREAM,?DEFAULT_TIMEOUT).
create_subscription(Client,Timeout)
when ?is_timeout(Timeout) ->
create_subscription(Client,?DEFAULT_STREAM,Timeout);
create_subscription(Client,Stream)
when is_list(Stream) ->
create_subscription(Client,Stream,?DEFAULT_TIMEOUT);
create_subscription(Client,Filter)
when ?is_filter(Filter) ->
create_subscription(Client,?DEFAULT_STREAM,Filter,
?DEFAULT_TIMEOUT).
create_subscription(Client,Stream,Timeout)
when is_list(Stream) andalso
?is_timeout(Timeout) ->
call(Client,{send_rpc_op,{create_subscription,self()},
[Stream,undefined,undefined,undefined],
Timeout});
create_subscription(Client,StartTime,StopTime)
when is_list(StartTime) andalso
is_list(StopTime) ->
create_subscription(Client,?DEFAULT_STREAM,StartTime,StopTime,
?DEFAULT_TIMEOUT);
create_subscription(Client,Filter,Timeout)
when ?is_filter(Filter) andalso
?is_timeout(Timeout) ->
create_subscription(Client,?DEFAULT_STREAM,Filter,Timeout);
create_subscription(Client,Stream,Filter)
when is_list(Stream) andalso
?is_filter(Filter) ->
create_subscription(Client,Stream,Filter,?DEFAULT_TIMEOUT).
create_subscription(Client,StartTime,StopTime,Timeout)
when is_list(StartTime) andalso
is_list(StopTime) andalso
?is_timeout(Timeout) ->
create_subscription(Client,?DEFAULT_STREAM,StartTime,StopTime,Timeout);
create_subscription(Client,Stream,StartTime,StopTime)
when is_list(Stream) andalso
is_list(StartTime) andalso
is_list(StopTime) ->
create_subscription(Client,Stream,StartTime,StopTime,?DEFAULT_TIMEOUT);
create_subscription(Client,Filter,StartTime,StopTime)
when ?is_filter(Filter) andalso
is_list(StartTime) andalso
is_list(StopTime) ->
create_subscription(Client,?DEFAULT_STREAM,Filter,
StartTime,StopTime,?DEFAULT_TIMEOUT);
create_subscription(Client,Stream,Filter,Timeout)
when is_list(Stream) andalso
?is_filter(Filter) andalso
?is_timeout(Timeout) ->
call(Client,{send_rpc_op,{create_subscription,self()},
[Stream,Filter,undefined,undefined],
Timeout}).
create_subscription(Client,Stream,StartTime,StopTime,Timeout)
when is_list(Stream) andalso
is_list(StartTime) andalso
is_list(StopTime) andalso
?is_timeout(Timeout) ->
call(Client,{send_rpc_op,{create_subscription,self()},
[Stream,undefined,StartTime,StopTime],
Timeout});
create_subscription(Client,Stream,Filter,StartTime,StopTime)
when is_list(Stream) andalso
?is_filter(Filter) andalso
is_list(StartTime) andalso
is_list(StopTime) ->
create_subscription(Client,Stream,Filter,StartTime,StopTime,?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec create_subscription(Client, Stream, Filter,StartTime, StopTime, Timeout) ->
Result when
Client :: client(),
Stream :: stream_name(),
Filter :: simple_xml(),
StartTime :: xs_datetime(),
StopTime :: xs_datetime(),
Timeout :: timeout(),
Result :: ok | {error,error_reason()}.
%% @doc Create a subscription for event notifications.
%%
%% This function sets up a subscription for netconf event
%% notifications of the given stream type, matching the given
%% filter. The calling process will receive notifications as messages
%% of type `notification()'.
%%
%% <dl>
%% <dt>Stream:</dt>
%% <dd> An optional parameter that indicates which stream of events
%% is of interest. If not present, events in the default NETCONF
%% stream will be sent.</dd>
%%
%% <dt>Filter:</dt>
%% <dd>An optional parameter that indicates which subset of all
%% possible events is of interest. The format of this parameter is
%% the same as that of the filter parameter in the NETCONF protocol
%% operations. If not present, all events not precluded by other
%% parameters will be sent. See section 3.6 for more information on
%% filters.</dd>
%%
%% <dt>StartTime:</dt>
%% <dd>An optional parameter used to trigger the replay feature and
%% indicate that the replay should start at the time specified. If
%% `StartTime' is not present, this is not a replay subscription.
%% It is not valid to specify start times that are later than the
%% current time. If the `StartTime' specified is earlier than the
%% log can support, the replay will begin with the earliest
%% available notification. This parameter is of type dateTime and
%% compliant to [RFC3339]. Implementations must support time
%% zones.</dd>
%%
%% <dt>StopTime:</dt>
%% <dd>An optional parameter used with the optional replay feature
%% to indicate the newest notifications of interest. If `StopTime'
%% is not present, the notifications will continue until the
%% subscription is terminated. Must be used with and be later than
%% `StartTime'. Values of `StopTime' in the future are valid. This
%% parameter is of type dateTime and compliant to [RFC3339].
%% Implementations must support time zones.</dd>
%% </dl>
%%
%% See RFC5277 for further details about the event notification
%% mechanism.
%%
%% @end
%%----------------------------------------------------------------------
create_subscription(Client,Stream,Filter,StartTime,StopTime,Timeout) ->
call(Client,{send_rpc_op,{create_subscription, self()},
[Stream,Filter,StartTime,StopTime],
Timeout}).
%%----------------------------------------------------------------------
%% @spec get_event_streams(Client, Timeout) -> Result
%% @equiv get_event_streams(Client, [], Timeout)
get_event_streams(Client,Timeout) when is_integer(Timeout); Timeout==infinity ->
get_event_streams(Client,[],Timeout);
%%----------------------------------------------------------------------
%% @spec get_event_streams(Client, Streams) -> Result
%% @equiv get_event_streams(Client, Streams, infinity)
get_event_streams(Client,Streams) when is_list(Streams) ->
get_event_streams(Client,Streams,?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec get_event_streams(Client, Streams, Timeout)
-> Result when
Client :: client(),
Streams :: [stream_name()],
Timeout :: timeout(),
Result :: {ok,streams()} | {error,error_reason()}.
%% @doc Send a request to get the given event streams.
%%
%% `Streams' is a list of stream names. The following filter will
%% be sent to the netconf server in a `get' request:
%%
%% ```
%% <netconf xmlns="urn:ietf:params:xml:ns:netmod:notification">
%% <streams>
%% <stream>
%% <name>StreamName1</name>
%% </stream>
%% <stream>
%% <name>StreamName2</name>
%% </stream>
%% ...
%% </streams>
%% </netconf>
%% '''
%%
%% If `Streams' is an empty list, ALL streams will be requested
%% by sending the following filter:
%%
%% ```
%% <netconf xmlns="urn:ietf:params:xml:ns:netmod:notification">
%% <streams/>
%% </netconf>
%% '''
%%
%% If more complex filtering is needed, a use {@link get/2} or {@link
%% get/3} and specify the exact filter according to XML Schema for
%% Event Notifications found in RFC5277.
%%
%% @end
%%----------------------------------------------------------------------
get_event_streams(Client,Streams,Timeout) ->
call(Client,{get_event_streams,Streams,Timeout}).
%%----------------------------------------------------------------------
%% @spec close_session(Client) -> Result
%% @equiv close_session(Client, infinity)
close_session(Client) ->
close_session(Client, ?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec close_session(Client, Timeout) -> Result when
Client :: client(),
Timeout :: timeout(),
Result :: ok | {error,error_reason()}.
%% @doc Request graceful termination of the session associated with the client.
%%
%% When a netconf server receives a `close-session' request, it
%% will gracefully close the session. The server will release any
%% locks and resources associated with the session and gracefully
%% close any associated connections. Any NETCONF requests received
%% after a `close-session' request will be ignored.
%%
%% @end
%%----------------------------------------------------------------------
close_session(Client, Timeout) ->
call(Client,{send_rpc_op, close_session, [], Timeout}, true).
%%----------------------------------------------------------------------
%% @spec kill_session(Client, SessionId) -> Result
%% @equiv kill_session(Client, SessionId, infinity)
kill_session(Client, SessionId) ->
kill_session(Client, SessionId, ?DEFAULT_TIMEOUT).
%%----------------------------------------------------------------------
-spec kill_session(Client, SessionId, Timeout) -> Result when
Client :: client(),
SessionId :: pos_integer(),
Timeout :: timeout(),
Result :: ok | {error,error_reason()}.
%% @doc Force termination of the session associated with the supplied
%% session id.
%%
%% The server side shall abort any operations currently in process,
%% release any locks and resources associated with the session, and
%% close any associated connections.
%%
%% Only if the server is in the confirmed commit phase, the
%% configuration will be restored to its state before entering the
%% confirmed commit phase. Otherwise, no configuration roll back will
%% be performed.
%%
%% If the given `SessionId' is equal to the current session id,
%% an error will be returned.
%%
%% @end
%% ----------------------------------------------------------------------
kill_session(Client, SessionId, Timeout) ->
call(Client,{send_rpc_op, kill_session, [SessionId], Timeout}).
%%----------------------------------------------------------------------
%% Callback functions
%%----------------------------------------------------------------------
%% @private
init(_KeyOrName,{_Host,_Port},Options) ->
case ssh_open(Options) of
{ok, Connection} ->
log(Connection,open),
{ConnPid,_} = Connection#connection.reference,
{ok, ConnPid, #state{connection = Connection}};
{error,Reason}->
{error,Reason}
end.
%% @private
terminate(_, #state{connection=Connection}) ->
ssh_close(Connection),
log(Connection,close),
ok.
%% @private
handle_msg({hello,Timeout}, From,
#state{connection=Connection,hello_status=HelloStatus} = State) ->
case do_send(Connection, client_hello()) of
ok ->
case HelloStatus of
undefined ->
{Ref,TRef} = set_request_timer(Timeout),
{noreply, State#state{hello_status=#pending{tref=TRef,
ref=Ref,
caller=From}}};
received ->
{reply, ok, State#state{hello_status=done}};
{error,Reason} ->
{stop, {error,Reason}, State}
end;
Error ->
{stop, Error, State}
end;
handle_msg(_, _From, #state{session_id=undefined} = State) ->
%% Hello is not yet excanged - this shall never happen
{reply,{error,waiting_for_hello},State};
handle_msg(get_capabilities, _From, #state{capabilities = Caps} = State) ->
{reply, Caps, State};
handle_msg(get_session_id, _From, #state{session_id = Id} = State) ->
{reply, Id, State};
handle_msg({send, Timeout, SimpleXml}, From,
#state{connection=Connection,pending=Pending} = State) ->
case do_send(Connection, SimpleXml) of
ok ->
{Ref,TRef} = set_request_timer(Timeout),
{noreply, State#state{pending=[#pending{tref=TRef,
ref=Ref,
caller=From} | Pending]}};
Error ->
{reply, Error, State}
end;
handle_msg({send_rpc, SimpleXml, Timeout}, From, State) ->
do_send_rpc(undefined, SimpleXml, Timeout, From, State);
handle_msg({send_rpc_op, Op, Data, Timeout}, From, State) ->
SimpleXml = encode_rpc_operation(Op,Data),
do_send_rpc(Op, SimpleXml, Timeout, From, State);
handle_msg({get_event_streams=Op,Streams,Timeout}, From, State) ->
Filter = {netconf,?NETMOD_NOTIF_NAMESPACE_ATTR,
[{streams,[{stream,[{name,[Name]}]} || Name <- Streams]}]},
SimpleXml = encode_rpc_operation(get,[Filter]),
do_send_rpc(Op, SimpleXml, Timeout, From, State).
handle_msg({ssh_cm, CM, {data, Ch, _Type, Data}}, State) ->
ssh_connection:adjust_window(CM,Ch,size(Data)),
handle_data(Data, State);
handle_msg({ssh_cm, _CM, _SshCloseMsg}, State) ->
%% _SshCloseMsg can probably be one of
%% {eof,Ch}
%% {exit_status,Ch,Status}
%% {exit_signal,Ch,ExitSignal,ErrorMsg,LanguageString}
%% {signal,Ch,Signal}
%% This might e.g. happen if the server terminates the connection,
%% as in kill-session (or if ssh:close is called from somewhere
%% unexpected).
%%! Log this??
%%! Currently the log will say that the client closed the
%%! connection - due to terminate/2
{stop, State};
handle_msg({Ref,timeout},
#state{hello_status=#pending{ref=Ref,caller=Caller}} = State) ->
ct_gen_conn:return(Caller,{error,{hello_session_failed,timeout}}),
{stop,State#state{hello_status={error,timeout}}};
handle_msg({Ref,timeout},#state{pending=Pending} = State) ->
{value,#pending{caller=Caller},Pending1} =
lists:keytake(Ref,#pending.ref,Pending),
ct_gen_conn:return(Caller,{error,timeout}),
{noreply,State#state{pending=Pending1}}.
%% @private
%% Called by ct_util_server to close registered connections before terminate.
close(Client) ->
case get_handle(Client) of
{ok,Pid} ->
case ct_gen_conn:stop(Pid) of
{error,{process_down,Pid,noproc}} ->
{error,already_closed};
Result ->
Result
end;
Error ->
Error
end.
%%----------------------------------------------------------------------
%% Internal functions
%%----------------------------------------------------------------------
call(Client, Msg) ->
call(Client, Msg, infinity, false).
call(Client, Msg, Timeout) when is_integer(Timeout); Timeout==infinity ->
call(Client, Msg, Timeout, false);
call(Client, Msg, WaitStop) when is_boolean(WaitStop) ->
call(Client, Msg, infinity, WaitStop).
call(Client, Msg, Timeout, WaitStop) ->
case get_handle(Client) of
{ok,Pid} ->
case ct_gen_conn:call(Pid,Msg,Timeout) of
{error,{process_down,Pid,noproc}} ->
{error,no_such_client};
{error,{process_down,Pid,normal}} when WaitStop ->
%% This will happen when server closes connection
%% before clien received rpc-reply on
%% close-session.
ok;
{error,{process_down,Pid,normal}} ->
{error,closed};
{error,{process_down,Pid,Reason}} ->
{error,{closed,Reason}};
Other when WaitStop ->
MRef = erlang:monitor(process,Pid),
receive
{'DOWN',MRef,process,Pid,Normal} when Normal==normal;
Normal==noproc ->
Other;
{'DOWN',MRef,process,Pid,Reason} ->
{error,{{closed,Reason},Other}}
after Timeout ->
erlang:demonitor(MRef, [flush]),
{error,{timeout,Other}}
end;
Other ->
Other
end;
Error ->
Error
end.
get_handle(Client) when is_pid(Client) ->
{ok,Client};
get_handle(Client) ->
case ct_util:get_connection(Client, ?MODULE) of
{ok,{Pid,_}} ->
{ok,Pid};
{error,no_registered_connection} ->
{error,{no_connection_found,Client}};
Error ->
Error
end.
check_options([], undefined, _Port, _Options) ->
{error, no_host_address};
check_options([], _Host, undefined, _Options) ->
{error, no_port};
check_options([], Host, Port, Options) ->
{Host,Port,Options};
check_options([{ssh, Host}|T], _, Port, #options{} = Options) ->
check_options(T, Host, Port, Options#options{host=Host});
check_options([{port,Port}|T], Host, _, #options{} = Options) ->
check_options(T, Host, Port, Options#options{port=Port});
check_options([{timeout, Timeout}|T], Host, Port, Options)
when is_integer(Timeout); Timeout==infinity ->
check_options(T, Host, Port, Options#options{timeout = Timeout});
check_options([{X,_}=Opt|T], Host, Port, #options{ssh=SshOpts}=Options) ->
case lists:member(X,?VALID_SSH_OPTS) of
true ->
check_options(T, Host, Port, Options#options{ssh=[Opt|SshOpts]});
false ->
{error, {invalid_option, Opt}}
end.
%%%-----------------------------------------------------------------
set_request_timer(infinity) ->
{undefined,undefined};
set_request_timer(T) ->
Ref = make_ref(),
{ok,TRef} = timer:send_after(T,{Ref,timeout}),
{Ref,TRef}.
%%%-----------------------------------------------------------------
client_hello() ->
{hello, ?NETCONF_NAMESPACE_ATTR,
[{capabilities,
[{capability,[?NETCONF_BASE_CAP++?NETCONF_BASE_CAP_VSN]}]}]}.
%%%-----------------------------------------------------------------
encode_rpc_operation(Lock,[Target]) when Lock==lock; Lock==unlock ->
{Lock,[{target,[Target]}]};
encode_rpc_operation(get,[Filter]) ->
{get,filter(Filter)};
encode_rpc_operation(get_config,[Source,Filter]) ->
{'get-config',[{source,[Source]}] ++ filter(Filter)};
encode_rpc_operation(edit_config,[Target,Config]) ->
{'edit-config',[{target,[Target]},{config,[Config]}]};
encode_rpc_operation(delete_config,[Target]) ->
{'delete-config',[{target,[Target]}]};
encode_rpc_operation(copy_config,[Target,Source]) ->
{'copy-config',[{target,[Target]},{source,[Source]}]};
encode_rpc_operation(action,[Action]) ->
{action,?ACTION_NAMESPACE_ATTR,[{data,[Action]}]};
encode_rpc_operation(kill_session,[SessionId]) ->
{'kill-session',[{'session-id',[integer_to_list(SessionId)]}]};
encode_rpc_operation(close_session,[]) ->
'close-session';
encode_rpc_operation({create_subscription,_},
[Stream,Filter,StartTime,StopTime]) ->
{'create-subscription',?NETCONF_NOTIF_NAMESPACE_ATTR,
[{stream,[Stream]}] ++
filter(Filter) ++
maybe_element(startTime,StartTime) ++
maybe_element(stopTime,StopTime)}.
filter(undefined) ->
[];
filter({xpath,Filter}) when ?is_string(Filter) ->
[{filter,[{type,"xpath"},{select, Filter}],[]}];
filter(Filter) ->
[{filter,[{type,"subtree"}],[Filter]}].
maybe_element(_,undefined) ->
[];
maybe_element(Tag,Value) ->
[{Tag,[Value]}].
%%%-----------------------------------------------------------------
%%% Send XML data to server
do_send_rpc(PendingOp,SimpleXml,Timeout,Caller,
#state{connection=Connection,msg_id=MsgId,pending=Pending} = State) ->
case do_send_rpc(Connection, MsgId, SimpleXml) of
ok ->
{Ref,TRef} = set_request_timer(Timeout),
{noreply, State#state{msg_id=MsgId+1,
pending=[#pending{tref=TRef,
ref=Ref,
msg_id=MsgId,
op=PendingOp,
caller=Caller} | Pending]}};
Error ->
{reply, Error, State#state{msg_id=MsgId+1}}
end.
do_send_rpc(Connection, MsgId, SimpleXml) ->
do_send(Connection,
{rpc,
[{'message-id',MsgId} | ?NETCONF_NAMESPACE_ATTR],
[SimpleXml]}).
do_send(Connection, SimpleXml) ->
Xml=to_xml_doc(SimpleXml),
log(Connection,send,Xml),
ssh_send(Connection, Xml).
to_xml_doc(Simple) ->
Prolog = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>",
Xml = unicode:characters_to_binary(
xmerl:export_simple([Simple],
xmerl_xml,
[#xmlAttribute{name=prolog,
value=Prolog}])),
<<Xml/binary,?END_TAG/binary>>.
%%%-----------------------------------------------------------------
%%% Parse and handle received XML data
handle_data(NewData,#state{connection=Connection,buff=Buff} = State) ->
log(Connection,recv,NewData),
Data = <<Buff/binary,NewData/binary>>,
case xmerl_sax_parser:stream(<<>>,
[{continuation_fun,fun sax_cont/1},
{continuation_state,{Data,Connection,false}},
{event_fun,fun sax_event/3},
{event_state,[]}]) of
{ok, Simple, Rest} ->
decode(Simple,State#state{buff=Rest});
{fatal_error,_Loc,Reason,_EndTags,_EventState} ->
?error(Connection#connection.name,[{parse_error,Reason},
{buffer,Buff},
{new_data,NewData}]),
case Reason of
{could_not_fetch_data,Msg} ->
handle_msg(Msg,State#state{buff = <<>>});
_Other ->
Pending1 =
case State#state.pending of
[] ->
[];
Pending ->
%% Assuming the first request gets the
%% first answer
P=#pending{tref=TRef,caller=Caller} =
lists:last(Pending),
timer:cancel(TRef),
Reason1 = {failed_to_parse_received_data,Reason},
ct_gen_conn:return(Caller,{error,Reason1}),
lists:delete(P,Pending)
end,
{noreply,State#state{pending=Pending1,buff = <<>>}}
end
end.
%%%-----------------------------------------------------------------
%%% Parsing of XML data
%% Contiuation function for the sax parser
sax_cont(done) ->
{<<>>,done};
sax_cont({Data,Connection,false}) ->
case binary:split(Data,[?END_TAG],[]) of
[All] ->
%% No end tag found. Remove what could be a part
%% of an end tag from the data and save for next
%% iteration
SafeSize = size(All)-5,
<<New:SafeSize/binary,Save:5/binary>> = All,
{New,{Save,Connection,true}};
[_Msg,_Rest]=Msgs ->
%% We have at least one full message. Any excess data will
%% be returned from xmerl_sax_parser:stream/2 in the Rest
%% parameter.
{list_to_binary(Msgs),done}
end;
sax_cont({Data,Connection,true}) ->
case ssh_receive_data() of
{ok,Bin} ->
log(Connection,recv,Bin),
sax_cont({<<Data/binary,Bin/binary>>,Connection,false});
{error,Reason} ->
throw({could_not_fetch_data,Reason})
end.
%% Event function for the sax parser. It builds a simple XML structure.
%% Care is taken to keep namespace attributes and prefixes as in the original XML.
sax_event(Event,_Loc,State) ->
sax_event(Event,State).
sax_event({startPrefixMapping, Prefix, Uri},Acc) ->
%% startPrefixMapping will always come immediately before the
%% startElement where the namespace is defined.
[{xmlns,{Prefix,Uri}}|Acc];
sax_event({startElement,_Uri,_Name,QN,Attrs},Acc) ->
%% Pick out any namespace attributes inserted due to a
%% startPrefixMapping event.The rest of Acc will then be only
%% elements.
{NsAttrs,NewAcc} = split_attrs_and_elements(Acc,[]),
Tag = qn_to_tag(QN),
[{Tag,NsAttrs ++ parse_attrs(Attrs),[]}|NewAcc];
sax_event({endElement,_Uri,_Name,_QN},[{Name,Attrs,Cont},{Parent,PA,PC}|Acc]) ->
[{Parent,PA,[{Name,Attrs,lists:reverse(Cont)}|PC]}|Acc];
sax_event(endDocument,[{Tag,Attrs,Cont}]) ->
{Tag,Attrs,lists:reverse(Cont)};
sax_event({characters,String},[{Name,Attrs,Cont}|Acc]) ->
[{Name,Attrs,[String|Cont]}|Acc];
sax_event(_Event,State) ->
State.
split_attrs_and_elements([{xmlns,{Prefix,Uri}}|Rest],Attrs) ->
split_attrs_and_elements(Rest,[{xmlnstag(Prefix),Uri}|Attrs]);
split_attrs_and_elements(Elements,Attrs) ->
{Attrs,Elements}.
xmlnstag([]) ->
xmlns;
xmlnstag(Prefix) ->
list_to_atom("xmlns:"++Prefix).
qn_to_tag({[],Name}) ->
list_to_atom(Name);
qn_to_tag({Prefix,Name}) ->
list_to_atom(Prefix ++ ":" ++ Name).
parse_attrs([{_Uri, [], Name, Value}|Attrs]) ->
[{list_to_atom(Name),Value}|parse_attrs(Attrs)];
parse_attrs([{_Uri, Prefix, Name, Value}|Attrs]) ->
[{list_to_atom(Prefix ++ ":" ++ Name),Value}|parse_attrs(Attrs)];
parse_attrs([]) ->
[].
%%%-----------------------------------------------------------------
%%% Decoding of parsed XML data
decode({Tag,Attrs,_}=E, #state{connection=Connection,pending=Pending}=State) ->
ConnName = Connection#connection.name,
case get_local_name_atom(Tag) of
'rpc-reply' ->
case get_msg_id(Attrs) of
undefined ->
case Pending of
[#pending{msg_id=MsgId}] ->
?error(ConnName,[{warning,rpc_reply_missing_msg_id},
{assuming,MsgId}]),
decode_rpc_reply(MsgId,E,State);
_ ->
?error(ConnName,[{error,rpc_reply_missing_msg_id}]),
{noreply,State}
end;
MsgId ->
decode_rpc_reply(MsgId,E,State)
end;
hello ->
case State#state.hello_status of
undefined ->
case decode_hello(E) of
{ok,SessionId,Capabilities} ->
{noreply,State#state{session_id = SessionId,
capabilities = Capabilities,
hello_status = received}};
{error,Reason} ->
{noreply,State#state{hello_status = {error,Reason}}}
end;
#pending{tref=TRef,caller=Caller} ->
timer:cancel(TRef),
case decode_hello(E) of
{ok,SessionId,Capabilities} ->
ct_gen_conn:return(Caller,ok),
{noreply,State#state{session_id = SessionId,
capabilities = Capabilities,
hello_status = done}};
{error,Reason} ->
ct_gen_conn:return(Caller,{error,Reason}),
{stop,State#state{hello_status={error,Reason}}}
end;
Other ->
?error(ConnName,[{got_unexpected_hello,E},
{hello_status,Other}]),
{noreply,State}
end;
notification ->
EventReceiver = State#state.event_receiver,
EventReceiver ! E,
{noreply,State};
Other ->
%% Result of send/2, when not sending an rpc request - or
%% if netconf server sends noise. Can handle this only if
%% there is just one pending that matches (i.e. has
%% undefined msg_id and op)
case [P || P = #pending{msg_id=undefined,op=undefined} <- Pending] of
[#pending{tref=TRef,
caller=Caller}] ->
timer:cancel(TRef),
ct_gen_conn:return(Caller,E),
{noreply,State#state{pending=[]}};
_ ->
?error(ConnName,[{got_unexpected_msg,Other},
{expecting,Pending}]),
{noreply,State}
end
end.
get_msg_id(Attrs) ->
case lists:keyfind('message-id',1,Attrs) of
{_,Str} ->
list_to_integer(Str);
false ->
undefined
end.
decode_rpc_reply(MsgId,{_,Attrs,Content0}=E,#state{pending=Pending} = State) ->
case lists:keytake(MsgId,#pending.msg_id,Pending) of
{value, #pending{tref=TRef,op=Op,caller=Caller}, Pending1} ->
timer:cancel(TRef),
Content = forward_xmlns_attr(Attrs,Content0),
{CallerReply,{ServerReply,State2}} =
do_decode_rpc_reply(Op,Content,State#state{pending=Pending1}),
ct_gen_conn:return(Caller,CallerReply),
{ServerReply,State2};
false ->
%% Result of send/2, when receiving a correct
%% rpc-reply. Can handle this only if there is just one
%% pending that matches (i.e. has undefined msg_id and op)
case [P || P = #pending{msg_id=undefined,op=undefined} <- Pending] of
[#pending{tref=TRef,
msg_id=undefined,
op=undefined,
caller=Caller}] ->
timer:cancel(TRef),
ct_gen_conn:return(Caller,E),
{noreply,State#state{pending=[]}};
_ ->
ConnName = (State#state.connection)#connection.name,
?error(ConnName,[{got_unexpected_msg_id,MsgId},
{expecting,Pending}]),
{noreply,State}
end
end.
do_decode_rpc_reply(Op,Result,State)
when Op==lock; Op==unlock; Op==edit_config; Op==delete_config;
Op==copy_config; Op==kill_session ->
{decode_ok(Result),{noreply,State}};
do_decode_rpc_reply(Op,Result,State)
when Op==get; Op==get_config; Op==action ->
{decode_data(Result),{noreply,State}};
do_decode_rpc_reply(close_session,Result,State) ->
case decode_ok(Result) of
ok -> {ok,{stop,State}};
Other -> {Other,{noreply,State}}
end;
do_decode_rpc_reply({create_subscription,Caller},Result,State) ->
case decode_ok(Result) of
ok ->
{ok,{noreply,State#state{event_receiver=Caller}}};
Other ->
{Other,{noreply,State}}
end;
do_decode_rpc_reply(get_event_streams,Result,State) ->
{decode_streams(decode_data(Result)),{noreply,State}};
do_decode_rpc_reply(undefined,Result,State) ->
{Result,{noreply,State}}.
decode_ok([{Tag,Attrs,Content}]) ->
case get_local_name_atom(Tag) of
ok ->
ok;
'rpc-error' ->
{error,forward_xmlns_attr(Attrs,Content)};
_Other ->
{error,{unexpected_rpc_reply,[{Tag,Attrs,Content}]}}
end;
decode_ok(Other) ->
{error,{unexpected_rpc_reply,Other}}.
decode_data([{Tag,Attrs,Content}]) ->
case get_local_name_atom(Tag) of
data ->
%% Since content of data has nothing from the netconf
%% namespace, we remove the parent's xmlns attribute here
%% - just to make the result cleaner
{ok,forward_xmlns_attr(remove_xmlnsattr_for_tag(Tag,Attrs),Content)};
'rpc-error' ->
{error,forward_xmlns_attr(Attrs,Content)};
_Other ->
{error,{unexpected_rpc_reply,[{Tag,Attrs,Content}]}}
end;
decode_data(Other) ->
{error,{unexpected_rpc_reply,Other}}.
get_qualified_name(Tag) ->
case string:tokens(atom_to_list(Tag),":") of
[TagStr] -> {[],TagStr};
[PrefixStr,TagStr] -> {PrefixStr,TagStr}
end.
get_local_name_atom(Tag) ->
{_,TagStr} = get_qualified_name(Tag),
list_to_atom(TagStr).
%% Remove the xmlns attr that points to the tag. I.e. if the tag has a
%% prefix, remove {'xmlns:prefix',_}, else remove default {xmlns,_}.
remove_xmlnsattr_for_tag(Tag,Attrs) ->
{Prefix,_TagStr} = get_qualified_name(Tag),
XmlnsTag = xmlnstag(Prefix),
case lists:keytake(XmlnsTag,1,Attrs) of
{value,_,NoNsAttrs} ->
NoNsAttrs;
false ->
Attrs
end.
%% Take all xmlns attributes from the parent's attribute list and
%% forward into all childrens' attribute lists. But do not overwrite
%% any.
forward_xmlns_attr(ParentAttrs,Children) ->
do_forward_xmlns_attr(get_all_xmlns_attrs(ParentAttrs,[]),Children).
do_forward_xmlns_attr(XmlnsAttrs,[{ChT,ChA,ChC}|Children]) ->
ChA1 = add_xmlns_attrs(XmlnsAttrs,ChA),
[{ChT,ChA1,ChC} | do_forward_xmlns_attr(XmlnsAttrs,Children)];
do_forward_xmlns_attr(_XmlnsAttrs,[]) ->
[].
add_xmlns_attrs([{Key,_}=A|XmlnsAttrs],ChA) ->
case lists:keymember(Key,1,ChA) of
true ->
add_xmlns_attrs(XmlnsAttrs,ChA);
false ->
add_xmlns_attrs(XmlnsAttrs,[A|ChA])
end;
add_xmlns_attrs([],ChA) ->
ChA.
get_all_xmlns_attrs([{xmlns,_}=Default|Attrs],XmlnsAttrs) ->
get_all_xmlns_attrs(Attrs,[Default|XmlnsAttrs]);
get_all_xmlns_attrs([{Key,_}=Attr|Attrs],XmlnsAttrs) ->
case atom_to_list(Key) of
"xmlns:"++_Prefix ->
get_all_xmlns_attrs(Attrs,[Attr|XmlnsAttrs]);
_ ->
get_all_xmlns_attrs(Attrs,XmlnsAttrs)
end;
get_all_xmlns_attrs([],XmlnsAttrs) ->
XmlnsAttrs.
%% Decode server hello to pick out session id and capabilities
decode_hello({hello,_Attrs,Hello}) ->
case lists:keyfind('session-id',1,Hello) of
{'session-id',_,[SessionId]} ->
case lists:keyfind(capabilities,1,Hello) of
{capabilities,_,Capabilities} ->
case decode_caps(Capabilities,[],false) of
{ok,Caps} ->
{ok,list_to_integer(SessionId),Caps};
Error ->
Error
end;
false ->
{error,{incorrect_hello,capabilities_not_found}}
end;
false ->
{error,{incorrect_hello,no_session_id_found}}
end.
decode_caps([{capability,[],[?NETCONF_BASE_CAP++Vsn=Cap]} |Caps], Acc, _) ->
case Vsn of
?NETCONF_BASE_CAP_VSN ->
decode_caps(Caps, [Cap|Acc], true);
_ ->
{error,{incompatible_base_capability_vsn,Vsn}}
end;
decode_caps([{capability,[],[Cap]}|Caps],Acc,Base) ->
decode_caps(Caps,[Cap|Acc],Base);
decode_caps([H|_T],_,_) ->
{error,{unexpected_capability_element,H}};
decode_caps([],_,false) ->
{error,{incorrect_hello,no_base_capability_found}};
decode_caps([],Acc,true) ->
{ok,lists:reverse(Acc)}.
%% Return a list of {Name,Data}, where data is a {Tag,Value} list for each stream
decode_streams({error,Reason}) ->
{error,Reason};
decode_streams({ok,[{netconf,_,Streams}]}) ->
{ok,decode_streams(Streams)};
decode_streams([{streams,_,Streams}]) ->
decode_streams(Streams);
decode_streams([{stream,_,Stream} | Streams]) ->
{name,_,[Name]} = lists:keyfind(name,1,Stream),
[{Name,[{Tag,Value} || {Tag,_,[Value]} <- Stream, Tag /= name]}
| decode_streams(Streams)];
decode_streams([]) ->
[].
%%%-----------------------------------------------------------------
%%% Logging
log(Connection,Action) ->
log(Connection,Action,<<>>).
log(#connection{host=Host,port=Port,name=Name},Action,Data) ->
error_logger:info_report(#conn_log{client=self(),
address={Host,Port},
name=Name,
action=Action,
module=?MODULE},
Data).
%% Log callback - called from the error handler process
format_data(How,Data) ->
%% Assuming that the data is encoded as UTF-8. If it is not, then
%% the printout might be wrong, but the format function will not
%% crash!
%% FIXME: should probably read encoding from the data and do
%% unicode:characters_to_binary(Data,InEncoding,utf8) when calling
%% log/3 instead of assuming utf8 in as done here!
do_format_data(How,unicode:characters_to_binary(Data)).
do_format_data(raw,Data) ->
io_lib:format("~n~ts~n",[hide_password(Data)]);
do_format_data(pretty,Data) ->
io_lib:format("~n~ts~n",[indent(Data)]);
do_format_data(html,Data) ->
io_lib:format("~n~ts~n",[html_format(Data)]).
%%%-----------------------------------------------------------------
%%% Hide password elements from XML data
hide_password(Bin) ->
re:replace(Bin,<<"(<password[^>]*>)[^<]*(</password>)">>,<<"\\1*****\\2">>,
[global,{return,binary},unicode]).
%%%-----------------------------------------------------------------
%%% HTML formatting
html_format(Bin) ->
binary:replace(indent(Bin),<<"<">>,<<"<">>,[global]).
%%%-----------------------------------------------------------------
%%% Indentation of XML code
indent(Bin) ->
String = normalize(hide_password(Bin)),
IndentedString =
case erase(part_of_line) of
undefined ->
indent1(String,[]);
Part ->
indent1(lists:reverse(Part)++String,erase(indent))
end,
unicode:characters_to_binary(IndentedString).
%% Normalizes the XML document by removing all space and newline
%% between two XML tags.
%% Returns a list, no matter if the input was a list or a binary.
normalize(Bin) ->
re:replace(Bin,<<">[ \r\n\t]+<">>,<<"><">>,[global,{return,list},unicode]).
indent1("<?"++Rest1,Indent1) ->
%% Prolog
{Line,Rest2,Indent2} = indent_line(Rest1,Indent1,[$?,$<]),
Line++indent1(Rest2,Indent2);
indent1("</"++Rest1,Indent1) ->
%% Stop tag
{Line,Rest2,Indent2} = indent_line1(Rest1,Indent1,[$/,$<]),
"\n"++Line++indent1(Rest2,Indent2);
indent1("<"++Rest1,Indent1) ->
%% Start- or empty tag
put(tag,get_tag(Rest1)),
{Line,Rest2,Indent2} = indent_line(Rest1,Indent1,[$<]),
"\n"++Line++indent1(Rest2,Indent2);
indent1([H|T],Indent) ->
[H|indent1(T,Indent)];
indent1([],_Indent) ->
[].
indent_line("?>"++Rest,Indent,Line) ->
%% Prolog
{lists:reverse(Line)++"?>",Rest,Indent};
indent_line("/></"++Rest,Indent,Line) ->
%% Empty tag, and stop of parent tag -> one step out in indentation
{Indent++lists:reverse(Line)++"/>","</"++Rest,Indent--" "};
indent_line("/>"++Rest,Indent,Line) ->
%% Empty tag, then probably next tag -> keep indentation
{Indent++lists:reverse(Line)++"/>",Rest,Indent};
indent_line("></"++Rest,Indent,Line) ->
LastTag = erase(tag),
case get_tag(Rest) of
LastTag ->
%% Start and stop tag, but no content
indent_line1(Rest,Indent,[$/,$<,$>|Line]);
_ ->
%% Stop tag completed, and then stop tag of parent -> one step out
{Indent++lists:reverse(Line)++">","</"++Rest,Indent--" "}
end;
indent_line("><"++Rest,Indent,Line) ->
%% Stop tag completed, and new tag comming -> keep indentation
{Indent++lists:reverse(Line)++">","<"++Rest," "++Indent};
indent_line("</"++Rest,Indent,Line) ->
%% Stop tag starting -> search for end of this tag
indent_line1(Rest,Indent,[$/,$<|Line]);
indent_line([H|T],Indent,Line) ->
indent_line(T,Indent,[H|Line]);
indent_line([],Indent,Line) ->
%% The line is not complete - will be continued later
put(part_of_line,Line),
put(indent,Indent),
{[],[],Indent}.
indent_line1("></"++Rest,Indent,Line) ->
%% Stop tag completed, and then stop tag of parent -> one step out
{Indent++lists:reverse(Line)++">","</"++Rest,Indent--" "};
indent_line1(">"++Rest,Indent,Line) ->
%% Stop tag completed -> keep indentation
{Indent++lists:reverse(Line)++">",Rest,Indent};
indent_line1([H|T],Indent,Line) ->
indent_line1(T,Indent,[H|Line]);
indent_line1([],Indent,Line) ->
%% The line is not complete - will be continued later
put(part_of_line,Line),
put(indent,Indent),
{[],[],Indent}.
get_tag("/>"++_) ->
[];
get_tag(">"++_) ->
[];
get_tag([H|T]) ->
[H|get_tag(T)];
get_tag([]) ->
%% The line is not complete - will be continued later.
[].
%%%-----------------------------------------------------------------
%%% SSH stuff
ssh_receive_data() ->
receive
{ssh_cm, CM, {data, Ch, _Type, Data}} ->
ssh_connection:adjust_window(CM,Ch,size(Data)),
{ok, Data};
{ssh_cm, _CM, {Closed, _Ch}} = X when Closed == closed; Closed == eof ->
{error,X};
{_Ref,timeout} = X ->
{error,X}
end.
ssh_open(#options{host=Host,timeout=Timeout,port=Port,ssh=SshOpts,name=Name}) ->
case ssh:connect(Host, Port,
[{user_interaction,false},
{silently_accept_hosts, true}|SshOpts]) of
{ok,CM} ->
case ssh_connection:session_channel(CM, Timeout) of
{ok,Ch} ->
case ssh_connection:subsystem(CM, Ch, "netconf", Timeout) of
success ->
{ok, #connection{reference = {CM,Ch},
host = Host,
port = Port,
name = Name}};
failure ->
ssh:close(CM),
{error,{ssh,could_not_execute_netconf_subsystem}}
end;
{error, Reason} ->
ssh:close(CM),
{error,{ssh,could_not_open_channel,Reason}};
Other ->
%% Bug in ssh?? got {closed,0} here once...
{error,{ssh,unexpected_from_session_channel,Other}}
end;
{error,Reason} ->
{error,{ssh,could_not_connect_to_server,Reason}}
end.
ssh_send(#connection{reference = {CM,Ch}}, Data) ->
case ssh_connection:send(CM, Ch, Data) of
ok -> ok;
{error,Reason} -> {error,{ssh,failed_to_send_data,Reason}}
end.
ssh_close(#connection{reference = {CM,_Ch}}) ->
ssh:close(CM).
%%----------------------------------------------------------------------
%% END OF MODULE
%%----------------------------------------------------------------------
