SIP Extension for Presence (RFC 3856)
[Event and Presence Framework]

Support for SIP Extension for Presence (RFC 3856). More...

Data Structures
struct	pjsip_pres_status
Defines
#define	PJSIP_PRES_STATUS_MAX_INFO   8
Functions
pj_status_t	pjsip_pres_init_module (pjsip_endpoint *endpt, pjsip_module *mod_evsub)
pjsip_module *	pjsip_pres_instance (void)
pj_status_t	pjsip_pres_create_uac (pjsip_dialog *dlg, const pjsip_evsub_user *user_cb, unsigned options, pjsip_evsub **p_evsub)
pj_status_t	pjsip_pres_create_uas (pjsip_dialog *dlg, const pjsip_evsub_user *user_cb, pjsip_rx_data *rdata, pjsip_evsub **p_evsub)
pj_status_t	pjsip_pres_terminate (pjsip_evsub *sub, pj_bool_t notify)
pj_status_t	pjsip_pres_initiate (pjsip_evsub *sub, pj_int32_t expires, pjsip_tx_data **p_tdata)
pj_status_t	pjsip_pres_add_header (pjsip_evsub *sub, const pjsip_hdr *hdr_list)
pj_status_t	pjsip_pres_accept (pjsip_evsub *sub, pjsip_rx_data *rdata, int st_code, const pjsip_hdr *hdr_list)
pj_status_t	pjsip_pres_notify (pjsip_evsub *sub, pjsip_evsub_state state, const pj_str_t *state_str, const pj_str_t *reason, pjsip_tx_data **p_tdata)
pj_status_t	pjsip_pres_current_notify (pjsip_evsub *sub, pjsip_tx_data **p_tdata)
pj_status_t	pjsip_pres_send_request (pjsip_evsub *sub, pjsip_tx_data *tdata)
pj_status_t	pjsip_pres_get_status (pjsip_evsub *sub, pjsip_pres_status *status)
pj_status_t	pjsip_pres_set_status (pjsip_evsub *sub, const pjsip_pres_status *status)
pj_status_t	pjsip_pres_create_pidf (pj_pool_t *pool, const pjsip_pres_status *status, const pj_str_t *entity, pjsip_msg_body **p_body)
pj_status_t	pjsip_pres_create_xpidf (pj_pool_t *pool, const pjsip_pres_status *status, const pj_str_t *entity, pjsip_msg_body **p_body)
pj_status_t	pjsip_pres_parse_pidf (pjsip_rx_data *rdata, pj_pool_t *pool, pjsip_pres_status *status)
pj_status_t	pjsip_pres_parse_pidf2 (char *body, unsigned body_len, pj_pool_t *pool, pjsip_pres_status *status)
pj_status_t	pjsip_pres_parse_xpidf (pjsip_rx_data *rdata, pj_pool_t *pool, pjsip_pres_status *status)
pj_status_t	pjsip_pres_parse_xpidf2 (char *body, unsigned body_len, pj_pool_t *pool, pjsip_pres_status *status)

---

Detailed Description

This module contains the implementation of SIP Presence Extension as described in RFC 3856. It uses the SIP Event Notification framework (evsub.h) and extends the framework by implementing "presence" event package.

---

Define Documentation

#define PJSIP_PRES_STATUS_MAX_INFO   8

Maximum presence status info.

---

Function Documentation

pj_status_t pjsip_pres_init_module	(	pjsip_endpoint *	endpt,
		pjsip_module *	mod_evsub
	)

Initialize the presence module and register it as endpoint module and package to the event subscription module.

Parameters:

	endpt	The endpoint instance.
	mod_evsub	The event subscription module instance.

Returns:

PJ_SUCCESS if the module is successfully initialized and registered to both endpoint and the event subscription module.

pjsip_module* pjsip_pres_instance

(

void

)

Get the presence module instance.

Returns:

The presence module instance.

pj_status_t pjsip_pres_create_uac	(	pjsip_dialog *	dlg,
		const pjsip_evsub_user *	user_cb,
		unsigned	options,
		pjsip_evsub **	p_evsub
	)

Create presence client subscription session.

Parameters:

	dlg	The underlying dialog to use.
	user_cb	Pointer to callbacks to receive presence subscription events.
	options	Option flags. Currently only PJSIP_EVSUB_NO_EVENT_ID is recognized.
	p_evsub	Pointer to receive the presence subscription session.

Returns:

PJ_SUCCESS on success.

pj_status_t pjsip_pres_create_uas	(	pjsip_dialog *	dlg,
		const pjsip_evsub_user *	user_cb,
		pjsip_rx_data *	rdata,
		pjsip_evsub **	p_evsub
	)

Create presence server subscription session.

Parameters:

	dlg	The underlying dialog to use.
	user_cb	Pointer to callbacks to receive presence subscription events.
	rdata	The incoming SUBSCRIBE request that creates the event subscription.
	p_evsub	Pointer to receive the presence subscription session.

Returns:

PJ_SUCCESS on success.

pj_status_t pjsip_pres_terminate	(	pjsip_evsub *	sub,
		pj_bool_t	notify
	)

Forcefully destroy the presence subscription. This function should only be called on special condition, such as when the subscription initialization has failed. For other conditions, application MUST terminate the subscription by sending the appropriate un(SUBSCRIBE) or NOTIFY.

Parameters:

	sub	The presence subscription.
	notify	Specify whether the state notification callback should be called.

Returns:

PJ_SUCCESS if subscription session has been destroyed.

pj_status_t pjsip_pres_initiate	(	pjsip_evsub *	sub,
		pj_int32_t	expires,
		pjsip_tx_data **	p_tdata
	)

Call this function to create request to initiate presence subscription, to refresh subcription, or to request subscription termination.

Parameters:

	sub	Client subscription instance.
	expires	Subscription expiration. If the value is set to zero, this will request unsubscription.
	p_tdata	Pointer to receive the request.

Returns:

PJ_SUCCESS on success.

pj_status_t pjsip_pres_add_header	(	pjsip_evsub *	sub,
		const pjsip_hdr *	hdr_list
	)

Add a list of headers to the subscription instance. The list of headers will be added to outgoing presence subscription requests.

Parameters:

	sub	Subscription instance.
	hdr_list	List of headers to be added.

Returns:

PJ_SUCCESS on success.

pj_status_t pjsip_pres_accept	(	pjsip_evsub *	sub,
		pjsip_rx_data *	rdata,
		int	st_code,
		const pjsip_hdr *	hdr_list
	)

Accept the incoming subscription request by sending 2xx response to incoming SUBSCRIBE request.

Parameters:

	sub	Server subscription instance.
	rdata	The incoming subscription request message.
	st_code	Status code, which MUST be final response.
	hdr_list	Optional list of headers to be added in the response.

Returns:

PJ_SUCCESS on success.

pj_status_t pjsip_pres_notify	(	pjsip_evsub *	sub,
		pjsip_evsub_state	state,
		const pj_str_t *	state_str,
		const pj_str_t *	reason,
		pjsip_tx_data **	p_tdata
	)

For notifier, create NOTIFY request to subscriber, and set the state of the subscription. Application MUST set the presence status to the appropriate state (by calling pjsip_pres_set_status()) before calling this function.

Parameters:

	sub	The server subscription (notifier) instance.
	state	New state to set.
	state_str	The state string name, if state contains value other than active, pending, or terminated. Otherwise this argument is ignored.
	reason	Specify reason if new state is terminated, otherwise put NULL.
	p_tdata	Pointer to receive the request.

Returns:

PJ_SUCCESS on success.

pj_status_t pjsip_pres_current_notify	(	pjsip_evsub *	sub,
		pjsip_tx_data **	p_tdata
	)

Create NOTIFY request to reflect current subscription status.

Parameters:

	sub	Server subscription object.
	p_tdata	Pointer to receive request.

Returns:

PJ_SUCCESS on success.

pj_status_t pjsip_pres_send_request	(	pjsip_evsub *	sub,
		pjsip_tx_data *	tdata
	)

Send request message that was previously created with initiate(), notify(), or current_notify(). Application may also send request created with other functions, e.g. authentication. But the request MUST be either request that creates/refresh subscription or NOTIFY request.

Parameters:

	sub	The subscription object.
	tdata	Request message to be sent.

Returns:

PJ_SUCCESS on success.

pj_status_t pjsip_pres_get_status	(	pjsip_evsub *	sub,
		pjsip_pres_status *	status
	)

Get the presence status. Client normally would call this function after receiving NOTIFY request from server.

Parameters:

	sub	The client or server subscription.
	status	The structure to receive presence status.

Returns:

PJ_SUCCESS on success.

pj_status_t pjsip_pres_set_status	(	pjsip_evsub *	sub,
		const pjsip_pres_status *	status
	)

Set the presence status. This operation is only valid for server subscription. After calling this function, application would need to send NOTIFY request to client.

Parameters:

	sub	The server subscription.
	status	Status to be set.

Returns:

PJ_SUCCESS on success.

pj_status_t pjsip_pres_create_pidf	(	pj_pool_t *	pool,
		const pjsip_pres_status *	status,
		const pj_str_t *	entity,
		pjsip_msg_body **	p_body
	)

This is a utility function to create PIDF message body from PJSIP presence status (pjsip_pres_status).

Parameters:

	pool	The pool to allocate memory for the message body.
	status	Presence status to be converted into PIDF message body.
	entity	The entity ID, which normally is equal to the presentity ID publishing this presence info.
	p_body	Pointer to receive the SIP message body.

Returns:

PJ_SUCCESS on success.

pj_status_t pjsip_pres_create_xpidf	(	pj_pool_t *	pool,
		const pjsip_pres_status *	status,
		const pj_str_t *	entity,
		pjsip_msg_body **	p_body
	)

This is a utility function to create X-PIDF message body from PJSIP presence status (pjsip_pres_status).

Parameters:

	pool	The pool to allocate memory for the message body.
	status	Presence status to be converted into X-PIDF message body.
	entity	The entity ID, which normally is equal to the presentity ID publishing this presence info.
	p_body	Pointer to receive the SIP message body.

Returns:

PJ_SUCCESS on success.

pj_status_t pjsip_pres_parse_pidf	(	pjsip_rx_data *	rdata,
		pj_pool_t *	pool,
		pjsip_pres_status *	status
	)

This is a utility function to parse PIDF body into PJSIP presence status.

Parameters:

	rdata	The incoming SIP message containing the PIDF body.
	pool	Pool to allocate memory to copy the strings into the presence status structure.
	status	The presence status to be initialized.

Returns:

PJ_SUCCESS on success.

See also:

pjsip_pres_parse_pidf2()

pj_status_t pjsip_pres_parse_pidf2	(	char *	body,
		unsigned	body_len,
		pj_pool_t *	pool,
		pjsip_pres_status *	status
	)

This is a utility function to parse PIDF body into PJSIP presence status.

Parameters:

	body	Text body, with one extra space at the end to place NULL character temporarily during parsing.
	body_len	Length of the body, not including the NULL termination character.
	pool	Pool to allocate memory to copy the strings into the presence status structure.
	status	The presence status to be initialized.

Returns:

PJ_SUCCESS on success.

See also:

pjsip_pres_parse_pidf()

pj_status_t pjsip_pres_parse_xpidf	(	pjsip_rx_data *	rdata,
		pj_pool_t *	pool,
		pjsip_pres_status *	status
	)

This is a utility function to parse X-PIDF body into PJSIP presence status.

Parameters:

	rdata	The incoming SIP message containing the X-PIDF body.
	pool	Pool to allocate memory to copy the strings into the presence status structure.
	status	The presence status to be initialized.

Returns:

PJ_SUCCESS on success.

See also:

pjsip_pres_parse_xpidf2()

pj_status_t pjsip_pres_parse_xpidf2	(	char *	body,
		unsigned	body_len,
		pj_pool_t *	pool,
		pjsip_pres_status *	status
	)

This is a utility function to parse X-PIDF body into PJSIP presence status.

Parameters:

	body	Text body, with one extra space at the end to place NULL character temporarily during parsing.
	body_len	Length of the body, not including the NULL termination character.
	pool	Pool to allocate memory to copy the strings into the presence status structure.
	status	The presence status to be initialized.

Returns:

PJ_SUCCESS on success.

See also:

pjsip_pres_parse_xpidf()