/* * Asterisk -- An open source telephony toolkit. * * Copyright (C) 2013, Digium, Inc. * * Jonathan Rose * * See http://www.asterisk.org for more information about * the Asterisk project. Please do not directly contact * any of the maintainers of this project for assistance; * the project provides a web site, mailing lists and IRC * channels for your use. * * This program is free software, distributed under the terms of * the GNU General Public License Version 2. See the LICENSE file * at the top of the source tree. */ /*! \file * * \brief Call Parking Resource Internal API * * \author Jonathan Rose */ #include "asterisk/pbx.h" #include "asterisk/bridge.h" #include "asterisk/parking.h" #include "asterisk/stasis_channels.h" #define DEFAULT_PARKING_LOT "default" #define DEFAULT_PARKING_EXTEN "700" #define BASE_REGISTRAR "res_parking" #define PARK_DIAL_CONTEXT "park-dial" #define PARKED_CALL_APPLICATION "ParkedCall" enum park_call_resolution { PARK_UNSET = 0, /*! Nothing set a resolution. This should never be observed in practice. */ PARK_ABANDON, /*! The channel for the parked call hung up */ PARK_TIMEOUT, /*! The parked call stayed parked until the parking lot timeout was reached and was removed */ PARK_FORCED, /*! The parked call was forcibly terminated by an unusual means in Asterisk */ PARK_ANSWERED, /*! The parked call was retrieved successfully */ }; enum parked_call_feature_options { OPT_PARKEDPLAY = 0, OPT_PARKEDTRANSFERS, OPT_PARKEDREPARKING, OPT_PARKEDHANGUP, OPT_PARKEDRECORDING, }; enum parking_lot_modes { PARKINGLOT_NORMAL = 0, /*! The parking lot is configured normally and can accept new calls. Disable on reload if the config isn't replaced. * valid transitions: PARKINGLOT_DISABLED */ PARKINGLOT_DYNAMIC, /*! The parking lot is a dynamically created parking lot. It can be parked to at any time. Disabled on last parked call leaving. * valid transitions: PARKINGLOT_DISABLED */ PARKINGLOT_DISABLED, /*! The parking lot is no longer linked to a parking lot in configuration. It can no longer be parked to. * and it can not be parked to. This mode has no transitions. */ }; struct parking_lot_cfg { int parking_start; /*!< First space in the parking lot */ int parking_stop; /*!< Last space in the parking lot */ unsigned int parkingtime; /*!< Analogous to parkingtime config option */ unsigned int comebackdialtime; /*!< Analogous to comebackdialtime config option */ unsigned int parkfindnext; /*!< Analogous to parkfindnext config option */ unsigned int parkext_exclusive; /*!< Analogous to parkext_exclusive config option */ unsigned int parkaddhints; /*!< Analogous to parkaddhints config option */ unsigned int comebacktoorigin; /*!< Analogous to comebacktoorigin config option */ int parkedplay; /*!< Analogous to parkedplay config option */ int parkedcalltransfers; /*!< Analogous to parkedcalltransfers config option */ int parkedcallreparking; /*!< Analogous to parkedcallreparking config option */ int parkedcallhangup; /*!< Analogous to parkedcallhangup config option */ int parkedcallrecording; /*!< Analogous to parkedcallrecording config option */ AST_DECLARE_STRING_FIELDS( AST_STRING_FIELD(name); /*!< Name of the parking lot configuration object */ AST_STRING_FIELD(registrar); /*!< Which registrar the lot uses if it isn't the default registrar */ AST_STRING_FIELD(mohclass); /*!< Analogous to mohclass config option */ AST_STRING_FIELD(parkext); /*!< Analogous to parkext config option */ AST_STRING_FIELD(parking_con); /*!< Analogous to context config option */ AST_STRING_FIELD(comebackcontext); /*!< Analogous to comebackcontext config option */ AST_STRING_FIELD(courtesytone); /*!< Analogous to courtesytone config option */ ); }; struct parking_lot { int next_space; /*!< When using parkfindnext, which space we should start searching from next time we park */ struct ast_bridge *parking_bridge; /*!< Bridged where parked calls will rest until they are answered or otherwise leave */ struct ao2_container *parked_users; /*!< List of parked users rigidly ordered by their parking space */ struct parking_lot_cfg *cfg; /*!< Reference to configuration object for the parking lot */ enum parking_lot_modes mode; /*!< Whether a parking lot is operational, being reconfigured, primed for deletion, or dynamically created. */ int disable_mark; /*!< On reload, disable this parking lot if it doesn't receive a new configuration. */ AST_DECLARE_STRING_FIELDS( AST_STRING_FIELD(name); /*!< Name of the parking lot object */ ); }; struct parked_user { struct ast_channel *chan; /*!< Parked channel */ struct ast_channel_snapshot *retriever; /*!< Snapshot of the channel that retrieves a parked call */ struct timeval start; /*!< When the call was parked */ int parking_space; /*!< Which parking space is used */ char comeback[AST_MAX_CONTEXT]; /*!< Where to go on parking timeout */ char *parker_dial_string; /*!< dialstring to call back with comebacktoorigin. Used timeout extension generation and call control */ unsigned int time_limit; /*!< How long this specific channel may remain in the parking lot before timing out */ struct parking_lot *lot; /*!< Which parking lot the user is parked to */ enum park_call_resolution resolution; /*!< How did the parking session end? If the call is in a bridge, lock parked_user before checking/setting */ }; #if defined(TEST_FRAMEWORK) /*! * \since 12.0.0 * \brief Create an empty parking lot configuration structure * useful for unit tests. * * \param cat name given to the parking lot * * \retval NULL failure * \retval non-NULL successfully allocated parking lot */ struct parking_lot_cfg *parking_lot_cfg_create(const char *cat); #endif /*! * \since 12.0.0 * \brief If a parking lot exists in the parking lot list already, update its status to match the provided * configuration and return a reference return a reference to it. Otherwise, create a parking lot * struct based on a parking lot configuration and return a reference to the new one. * * \param cfg The configuration being used as a reference to build the parking lot from. * \param dynamic non-zero if creating a dynamic parking lot with this. Don't replace existing parking lots. Ever. * * \retval A reference to the new parking lot * \retval NULL if it was not found and could not be allocated * * \note The parking lot will need to be unreffed if it ever falls out of scope * \note The parking lot will automatically be added to the parking lot container if needed as part of this process */ struct parking_lot *parking_lot_build_or_update(struct parking_lot_cfg *cfg, int dynamic); /*! * \since 12.0.0 * \brief Remove a parking lot from the usable lists if it is no longer involved in any calls and no configuration currently claims it * * \param lot Which parking lot is being checked for elimination * * \retval 0 if the parking lot was removed * \retval -1 if the parking lot wasn't removed. * * \note This should generally be called when something is happening that could cause a parking lot to die such as a call being unparked or * a parking lot no longer existing in configurations. */ int parking_lot_remove_if_unused(struct parking_lot *lot); /*! * \since 12.0.0 * \brief Create a new parking bridge * * \param bridge_lot Parking lot which the new bridge should be based on * * \retval NULL if the bridge can not be created * \retval Newly created parking bridge */ struct ast_bridge *bridge_parking_new(struct parking_lot *bridge_lot); /*! * \since 12.0.0 * \brief Get a reference to a parking lot's bridge. If it doesn't exist, create it and get a reference. * * \param lot Which parking lot we need the bridge from. This parking lot must be locked before calling this function. * * \retval A reference to the ast_bridge associated with the parking lot * \retval NULL if it didn't already have a bridge and one couldn't be created * * \note This bridge will need to be unreffed if it ever falls out of scope. */ struct ast_bridge *parking_lot_get_bridge(struct parking_lot *lot); /*! * \since 12.0.0 * \brief Get an available parking space within a parking lot. * * \param lot Which parking lot we are getting a space from * \param target_override If there is a specific slot we want, provide it here and we'll start from that position * * \retval -1 if No slot can be found * \retval integer value of parking space selected * * \note lot should be locked before this is called and unlocked only after a parked_user with the space * returned has been added to the parking lot. */ int parking_lot_get_space(struct parking_lot *lot, int target_override); /*! * \since 12.0.0 * \brief Determine if there is a parked user in a parking space and pull it from the parking lot if there is. * * \param lot Parking lot being pulled from * \param target If < 0 search for the first occupied space in the parking lot * If >= 0 Only pull from the indicated target * * \retval NULL if no parked user could be pulled from the requested parking lot at the requested parking space * \retval reference to the requested parked user * * \note The parked user will be removed from parking lot as part of this process * \note Remove this reference with ao2_cleanup once it falls out of scope. */ struct parked_user *parking_lot_retrieve_parked_user(struct parking_lot *lot, int target); /*! * \since 12.0.0 * \brief Apply features based on the parking lot feature options * * \param chan Which channel's feature set is being modified * \param lot parking lot which establishes the features used * \param recipient_mode AST_FEATURE_FLAG_BYCALLER if the user is the retriever * AST_FEATURE_FLAG_BYCALLEE if the user is the parkee */ void parked_call_retrieve_enable_features(struct ast_channel *chan, struct parking_lot *lot, int recipient_mode); /*! * \since 12.0.0 * \brief Set necessary bridge roles on a channel that is about to enter a parking lot * * \param chan Entering channel * \param lot The parking lot the channel will be entering * \param force_ringing Use ringing instead of music on hold * * \retval 0 on success * \retval non-zero on failure */ int parking_channel_set_roles(struct ast_channel *chan, struct parking_lot *lot, int force_ringing); /*! * \since 12.0.0 * \brief custom callback function for ast_bridge_channel_queue_playfile which plays a parking space * and optionally hangs up the call afterwards based on the payload in playfile. */ void say_parking_space(struct ast_bridge_channel *bridge_channel, const char *payload); /*! * \since 12.0.0 * \brief Setup timeout interval feature on an ast_bridge_features for parking * * \param features The ast_bridge_features we are establishing the interval hook on * \param user The parked_user receiving the timeout duration limits */ void parking_set_duration(struct ast_bridge_features *features, struct parked_user *user); /*! * \since 12.0.0 * \brief Get a pointer to the parking lot container for purposes such as iteration * * \retval pointer to the parking lot container. */ struct ao2_container *get_parking_lot_container(void); /*! * \since 12.0.0 * \brief Find a parking lot based on its name * * \param lot_name Name of the parking lot sought * * \retval The parking lot if found * \retval NULL if no parking lot with the name specified exists * * \note ao2_cleanup this reference when you are done using it or you'll cause leaks. */ struct parking_lot *parking_lot_find_by_name(const char *lot_name); /*! * \since 12.0.0 * \brief Create a dynamic parking lot * * \param name Dynamic parking lot name to create * \param chan Channel parkee to get dynamic parking lot parameters from * * \retval dynamically created parking lot on success * \retval NULL on error * * \note This should be called only after verifying that the named parking lot doesn't already exist in a non-dynamic way. */ struct parking_lot *parking_create_dynamic_lot(const char *name, struct ast_channel *chan); #if defined(TEST_FRAMEWORK) /*! * \since 12.0.0 * \brief Create a dynamic parking lot without respect to whether they are enabled by configuration * * \param name Dynamic parking lot name to create * \param chan Channel parkee to get the dynamic parking lot parameters from * * \retval dynamically created parking lot on success * \retval NULL on error * * \note This should be called only after verifying that the named parking lot doesn't already exist in a non-dynamic way. */ struct parking_lot *parking_create_dynamic_lot_forced(const char *name, struct ast_channel *chan); #endif /*! * \since 12.0.0 * \brief Find parking lot name from channel * * \param chan The channel we want the parking lot name for * * \return name of the parking lot to use for the channel. * * \note Always returns a parking lot name. * * \note Channel needs to be locked while the returned string is in use. */ const char *find_channel_parking_lot_name(struct ast_channel *chan); /*! * \since 12.0.0 * \brief Flattens a dial string so that it can be written to/found from PBX extensions * * \param peername unflattened dial string. This will be flattened in place. */ void flatten_dial_string(char *dialstring); /*! * \since 12.0.0 * \brief Set a channel's position in the PBX after timeout using the parking lot settings * * \param pu Parked user who is entering/reentering the PBX * \param lot Parking lot the user was removed from. * * \retval 0 Position set successfully * \retval -1 Failed to set the position */ int comeback_goto(struct parked_user *pu, struct parking_lot *lot); /*! * \since 12.0.0 * \brief Add extensions for a parking lot configuration * * \param lot_cfg parking lot configuration to generate extensions for * * \retval 0 on success * \retval non-zero on failure */ int parking_lot_cfg_create_extensions(struct parking_lot_cfg *lot_cfg); /*! * \since 12.0.0 * \brief Remove extensions belonging to a parking lot configuration * * \param lot_cfg parking lot configuratin to remove extensions from * * \note This will not remove extensions registered non-exclusively even * if those extensions were registered by lot_cfg. Those are only * purged on a res_parking module reload. */ void parking_lot_cfg_remove_extensions(struct parking_lot_cfg *lot_cfg); /*! * \since 12.0.0 * \brief Pull a parked user out of its parking lot. Use this when you don't want to use the parked user afterwards. * \param user The parked user being pulled. * * \retval 0 on success * \retval -1 if the user didn't have its parking lot set */ int unpark_parked_user(struct parked_user *user); /*! * \since 12.0.0 * \brief Publish a stasis parked call message for the channel indicating failure to park. * * \param parkee channel belonging to the failed parkee */ void publish_parked_call_failure(struct ast_channel *parkee); /*! * \since 12.0.0 * \brief Publish a stasis parked call message for a given parked user * * \param pu pointer to a parked_user that we are generating the message for * \param event_type What parked call event type is provoking this message */ void publish_parked_call(struct parked_user *pu, enum ast_parked_call_event_type event_type); /*! * \since 12.3.0 * \brief Create a parking announcement subscription * * \param chan Channel that will receive the announcement * \param parkee_uuid Unique ID of the channel being parked * \param hangup_after if non-zero, have the channel hangup after hearing the announcement * * \retval 0 on success * \retval -1 on failure */ int create_parked_subscription(struct ast_channel *chan, const char *parkee_uuid, int hangup_after); /*! * \since 12.0.0 * \brief Setup a parked call on a parking bridge without needing to parse appdata * */ struct ast_bridge *park_common_setup(struct ast_channel *parkee, struct ast_channel *parker, const char *lot_name, const char *comeback_override, int use_ringing, int randomize, int time_limit, int silence_announcements); /*! * \since 12.0.0 * \brief Function to prepare a channel for parking by determining which parking bridge should * be used, setting up a park common datastore so that the parking bridge will have access * to necessary parking information when joining, and applying various bridge roles to the * channel. * * \param parkee The channel being preparred for parking * \param parker The channel initiating the park; may be the parkee as well. May be NULL. * \param app_data arguments supplied to the Park application. May be NULL. * \param silence_announcements optional pointer to an integer where we want to store the silence option flag * this value should be initialized to 0 prior to calling park_common_setup. * * \retval reference to a parking bridge if successful * \retval NULL on failure * * \note ao2_cleanup this reference when you are done using it or you'll cause leaks. */ struct ast_bridge *park_application_setup(struct ast_channel *parkee, struct ast_channel *parker, const char *app_data, int *silence_announcements); struct park_common_datastore { char *parker_uuid; /*!< Unique ID of the channel parking the call. */ char *parker_dial_string; /*!< Dial string that we would attempt to call when timing out when comebacktoorigin=yes */ char *comeback_override; /*!< Optional goto string for where to send the call after we are done */ int randomize; /*!< Pick a parking space to enter on at random */ int time_limit; /*!< time limit override. -1 values don't override, 0 for unlimited time, >0 for custom time limit in seconds */ int silence_announce; /*!< Used when a call parks itself to keep it from hearing the parked call announcement */ }; /*! * \since 12.0.0 * \brief Get a copy of the park_common_datastore from a channel that is being parked * * \param parkee The channel entering parking with the datastore we are checking * * \retval Pointer to a copy of the park common datastore for parkee if it could be cloned. This needs to be free'd with park_common_datastore free. * \retval NULL if the park_common_datastore could not be copied off of the channel. */ struct park_common_datastore *get_park_common_datastore_copy(struct ast_channel *parkee); /*! * \since 12.0.0 * \brief Free a park common datastore struct * * \param datastore The park_common_datastore being free'd. (NULL tolerant) */ void park_common_datastore_free(struct park_common_datastore *datastore); /*! * \since 12.0.0 * \brief Notify metermaids that we've changed an extension * * \param exten Extension of the call parked/unparked * \param context Context of the call parked/unparked * \param state new device state */ void parking_notify_metermaids(int exten, const char *context, enum ast_device_state state); /*! * \since 12.0.0 * \brief Check global configuration to see if dynamic parking is enabled * * \retval 1 if dynamic parking is enabled * \retval 0 if dynamic parking is disabled */ int parking_dynamic_lots_enabled(void); /*! * \since 12.0.0 * \brief Register parking applications * * \retval 0 if successful * \retval -1 on failure */ int load_parking_applications(void); /*! * \since 12.0.0 * \brief Unregister parking applications */ void unload_parking_applications(void); /*! * \since 12.0.0 * \brief Register CLI commands * * \retval 0 if successful * \retval -1 on failure */ int load_parking_ui(void); /*! * \since 12.0.0 * \brief Unregister CLI commands */ void unload_parking_ui(void); /*! * \since 12.0.0 * \brief Register manager actions and setup subscriptions for stasis events */ int load_parking_manager(void); /*! * \since 12.0.0 * \brief Unregister manager actions and remove subscriptions for stasis events */ void unload_parking_manager(void); /*! * \since 12.0.0 * \brief Register bridge features for parking * * \retval 0 on success * \retval -1 on failure */ int load_parking_bridge_features(void); /*! * \since 12.0.0 * \brief Unregister features registered by load_parking_bridge_features */ void unload_parking_bridge_features(void); /*! * \since 12.0.0 * \brief Register Parking devstate handler */ int load_parking_devstate(void); /*! * \since 12.0.0 * \brief Unregister Parking devstate handler */ void unload_parking_devstate(void); /*! * \since 12.0.0 * \brief Register parking unit tests * * \retval 0 on success * \retval nonzero on failure */ int load_parking_tests(void); /*! * \since 12.0.0 * \brief Unregister parking unit tests * * \return Nothing */ void unload_parking_tests(void);