3 * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
4 * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #ifndef __PJSIP_SIP_MISC_H__
21 #define __PJSIP_SIP_MISC_H__
23 #include <pjsip/sip_msg.h>
24 #include <pjsip/sip_transport.h>
25 #include <pjsip/sip_resolve.h>
30 * @defgroup PJSIP_ENDPT_TARGET_URI Target URI Management
31 * @ingroup PJSIP_CORE_CORE
32 * @brief Management of target URI's in case of redirection
34 * This module provides utility functions to manage target set for UAC.
35 * The target set is provided as pjsip_target_set structure. Initially,
36 * the target set for UAC contains only one target, that is the target of
37 * the initial request. When 3xx/redirection class response is received,
38 * the UAC can use the functionality of this module to add the URI's listed
39 * in the Contact header(s) in the response to the target set, and retry
40 * sending the request to the next destination/target. The UAC may retry
41 * this sequentially until one of the target answers with succesful/2xx
42 * response, or one target returns global error/6xx response, or all targets
45 * This module is currently used by the \ref PJSIP_INV.
49 * This structure describes a target, which can be chained together to form
50 * a target set. Each target contains an URI, priority (as q-value), and
51 * the last status code and reason phrase received from the target, if the
52 * target has been contacted. If the target has not been contacted, the
53 * status code field will be zero.
55 typedef struct pjsip_target
57 PJ_DECL_LIST_MEMBER(struct pjsip_target);/**< Standard list element */
58 pjsip_uri *uri; /**< The target URI */
59 int q1000; /**< q-value multiplied by 1000 */
60 pjsip_status_code code; /**< Last status code received */
61 pj_str_t reason; /**< Last reason phrase received */
66 * This describes a target set. A target set contains a linked-list of
69 typedef struct pjsip_target_set
71 pjsip_target head; /**< Target linked-list head */
72 pjsip_target *current; /**< Current target. */
77 * These enumerations specify the action to be performed to a redirect
80 typedef enum pjsip_redirect_op
83 * Reject the redirection to the current target. The UAC will
84 * select the next target from the target set if exists.
86 PJSIP_REDIRECT_REJECT,
89 * Accept the redirection to the current target. The INVITE request
90 * will be resent to the current target.
92 PJSIP_REDIRECT_ACCEPT,
95 * Defer the redirection decision, for example to request permission
98 PJSIP_REDIRECT_PENDING,
101 * Stop the whole redirection process altogether. This will cause
102 * the invite session to be disconnected.
110 * Initialize target set. This will empty the list of targets in the
113 * @param tset The target set.
115 PJ_INLINE(void) pjsip_target_set_init(pjsip_target_set *tset)
117 pj_list_init(&tset->head);
118 tset->current = NULL;
123 * Add an URI to the target set, if the URI is not already in the target set.
124 * The URI comparison rule of pjsip_uri_cmp() will be used to determine the
125 * equality of this URI compared to existing URI's in the target set. The
126 * URI will be cloned using the specified memory pool before it is added to
129 * The first URI added to the target set will also be made current target
132 * @param tset The target set.
133 * @param pool The memory pool to be used to duplicate the URI.
134 * @param uri The URI to be checked and added.
135 * @param q1000 The q-value multiplied by 1000.
137 * @return PJ_SUCCESS if the URI was added to the target set,
138 * or PJ_EEXISTS if the URI already exists in the target
139 * set, or other error codes.
141 PJ_DECL(pj_status_t) pjsip_target_set_add_uri(pjsip_target_set *tset,
143 const pjsip_uri *uri,
147 * Extract URI's in the Contact headers of the specified (response) message
148 * and add them to the target set. This function will also check if the
149 * URI's already exist in the target set before adding them to the list.
151 * @param tset The target set.
152 * @param pool The memory pool to be used to duplicate the URI's.
153 * @param msg SIP message from which the Contact headers will be
154 * scanned and the URI's to be extracted, checked, and
155 * added to the target set.
157 * @return PJ_SUCCESS if at least one URI was added to the
158 * target set, or PJ_EEXISTS if all URI's in the message
159 * already exists in the target set or if the message
160 * doesn't contain usable Contact headers, or other error
163 PJ_DECL(pj_status_t) pjsip_target_set_add_from_msg(pjsip_target_set *tset,
165 const pjsip_msg *msg);
168 * Get the next target to be retried. This function will scan the target set
169 * for target which hasn't been tried, and return one target with the
170 * highest q-value, if such target exists. This function will return NULL
171 * if there is one target with 2xx or 6xx code or if all targets have been
174 * @param tset The target set.
176 * @return The next target to be tried, or NULL if all targets have
177 * been tried or at least one target returns 2xx or 6xx
180 PJ_DECL(pjsip_target*)
181 pjsip_target_set_get_next(const pjsip_target_set *tset);
185 * Set the specified target as the current target in the target set. The
186 * current target may be used by application to keep track on which target
187 * is currently being operated on.
189 * @param tset The target set.
190 * @param target The target to be set as current target.
192 * @return PJ_SUCCESS or the appropriate error code.
194 PJ_DECL(pj_status_t) pjsip_target_set_set_current(pjsip_target_set *tset,
195 pjsip_target *target);
199 * Set the status code and reason phrase of the specified target.
201 * @param target The target.
202 * @param pool The memory pool to be used to duplicate the reason phrase.
203 * @param code The SIP status code to be set to the target.
204 * @param reason The reason phrase to be set to the target.
206 * @return PJ_SUCCESS on successful operation or the appropriate
209 PJ_DECL(pj_status_t) pjsip_target_assign_status(pjsip_target *target,
212 const pj_str_t *reason);
219 * @defgroup PJSIP_ENDPT_STATELESS Message Creation and Stateless Operations
220 * @ingroup PJSIP_CORE_CORE
221 * @brief Utilities to create various messages and base function to send messages.
226 * Create an independent request message. This can be used to build any
227 * request outside a dialog, such as OPTIONS, MESSAGE, etc. To create a request
228 * inside a dialog, application should use #pjsip_dlg_create_request.
230 * This function adds the following headers in the request:
231 * - From, To, Call-ID, and CSeq,
232 * - Contact header, if contact is specified.
233 * - A blank Via header.
234 * - Additional request headers (such as Max-Forwards) which are copied
235 * from endpoint configuration.
237 * In addition, the function adds a unique tag in the From header.
239 * Once a transmit data is created, the reference counter is initialized to 1.
241 * @param endpt Endpoint instance.
242 * @param method SIP Method.
243 * @param target Target URI.
244 * @param from URL to put in From header.
245 * @param to URL to put in To header.
246 * @param contact Contact to be put as Contact header value, hence
247 * the format must follow RFC 3261 Section 20.10:
248 * When the header field value contains a display
249 * name, the URI including all URI parameters is
250 * enclosed in "<" and ">". If no "<" and ">" are
251 * present, all parameters after the URI are header
252 * parameters, not URI parameters. The display name
253 * can be tokens, or a quoted string, if a larger
254 * character set is desired.
255 * @param call_id Optional Call-ID (put NULL to generate unique Call-ID).
256 * @param cseq Optional CSeq (put -1 to generate random CSeq).
257 * @param text Optional text body (put NULL to omit body).
258 * @param p_tdata Pointer to receive the transmit data.
260 * @return PJ_SUCCESS, or the appropriate error code.
262 PJ_DECL(pj_status_t) pjsip_endpt_create_request( pjsip_endpoint *endpt,
263 const pjsip_method *method,
264 const pj_str_t *target,
265 const pj_str_t *from,
267 const pj_str_t *contact,
268 const pj_str_t *call_id,
270 const pj_str_t *text,
271 pjsip_tx_data **p_tdata);
274 * Create an independent request message from the specified headers. This
275 * function will clone the headers and put them in the request.
277 * This function adds the following headers in the request:
278 * - From, To, Call-ID, and CSeq,
279 * - Contact header, if contact is specified.
280 * - A blank Via header.
281 * - Additional request headers (such as Max-Forwards) which are copied
282 * from endpoint configuration.
284 * In addition, the function adds a unique tag in the From header.
286 * Once a transmit data is created, the reference counter is initialized to 1.
288 * @param endpt Endpoint instance.
289 * @param method SIP Method.
290 * @param target Target URI.
291 * @param from From header.
292 * @param to To header.
293 * @param contact Contact header.
294 * @param call_id Optional Call-ID (put NULL to generate unique Call-ID).
295 * @param cseq Optional CSeq (put -1 to generate random CSeq).
296 * @param text Optional text body (put NULL to omit body).
297 * @param p_tdata Pointer to receive the transmit data.
299 * @return PJ_SUCCESS, or the appropriate error code.
302 pjsip_endpt_create_request_from_hdr( pjsip_endpoint *endpt,
303 const pjsip_method *method,
304 const pjsip_uri *target,
305 const pjsip_from_hdr *from,
306 const pjsip_to_hdr *to,
307 const pjsip_contact_hdr *contact,
308 const pjsip_cid_hdr *call_id,
310 const pj_str_t *text,
311 pjsip_tx_data **p_tdata);
314 * Construct a minimal response message for the received request. This function
315 * will construct all the Via, Record-Route, Call-ID, From, To, CSeq, and
316 * Call-ID headers from the request.
318 * Note: the txdata reference counter is set to ZERO!.
320 * @param endpt The endpoint.
321 * @param rdata The request receive data.
322 * @param st_code Status code to be put in the response.
323 * @param st_text Optional status text, or NULL to get the default text.
324 * @param p_tdata Pointer to receive the transmit data.
326 * @return PJ_SUCCESS, or the appropriate error code.
328 PJ_DECL(pj_status_t) pjsip_endpt_create_response( pjsip_endpoint *endpt,
329 const pjsip_rx_data *rdata,
331 const pj_str_t *st_text,
332 pjsip_tx_data **p_tdata);
335 * Construct a full ACK request for the received non-2xx final response.
336 * This utility function is normally called by the transaction to construct
337 * an ACK request to 3xx-6xx final response.
338 * The generation of ACK message for 2xx final response is different than
341 * @param endpt The endpoint.
342 * @param tdata This contains the original INVITE request
343 * @param rdata The final response.
344 * @param ack The ACK request created.
346 * @return PJ_SUCCESS, or the appropriate error code.
348 PJ_DECL(pj_status_t) pjsip_endpt_create_ack( pjsip_endpoint *endpt,
349 const pjsip_tx_data *tdata,
350 const pjsip_rx_data *rdata,
351 pjsip_tx_data **ack);
355 * Construct CANCEL request for the previously sent request.
357 * @param endpt The endpoint.
358 * @param tdata The transmit buffer for the request being cancelled.
359 * @param p_tdata Pointer to receive the transmit data.
361 * @return PJ_SUCCESS, or the appropriate error code.
363 PJ_DECL(pj_status_t) pjsip_endpt_create_cancel( pjsip_endpoint *endpt,
364 const pjsip_tx_data *tdata,
365 pjsip_tx_data **p_tdata);
369 * Find which destination to be used to send the request message, based
370 * on the request URI and Route headers in the message. The procedure
371 * used here follows the guidelines on sending the request in RFC 3261
374 * Note there was a change in the behavior of this function since version
375 * 0.5.10.2. Previously this function may modify the request when strict
376 * route is present (to update request URI and route-set). This is no
377 * longer the case now, and this process is done in separate function
378 * (see #pjsip_process_route_set()).
380 * @param tdata The transmit data containing the request message.
381 * @param dest_info On return, it contains information about destination
382 * host to contact, along with the preferable transport
383 * type, if any. Caller will then normally proceed with
384 * resolving this host with server resolution procedure
385 * described in RFC 3263.
387 * @return PJ_SUCCESS, or the appropriate error code.
389 * @see pjsip_process_route_set
391 PJ_DECL(pj_status_t) pjsip_get_request_dest(const pjsip_tx_data *tdata,
392 pjsip_host_info *dest_info );
396 * Process route-set found in the request and calculate destination to be
397 * used to send the request message, based on the request URI and Route
398 * headers in the message. The procedure used here follows the guidelines
399 * on sending the request in RFC 3261 chapter 8.1.2.
401 * This function may modify the message (request line and Route headers),
402 * if the Route information specifies strict routing and the request
403 * URI in the message is different than the calculated target URI. In that
404 * case, the target URI will be put as the request URI of the request and
405 * current request URI will be put as the last entry of the Route headers.
407 * @param tdata The transmit data containing the request message.
408 * @param dest_info On return, it contains information about destination
409 * host to contact, along with the preferable transport
410 * type, if any. Caller will then normally proceed with
411 * resolving this host with server resolution procedure
412 * described in RFC 3263.
414 * @return PJ_SUCCESS, or the appropriate error code.
416 * @see pjsip_get_request_addr
418 PJ_DECL(pj_status_t) pjsip_process_route_set(pjsip_tx_data *tdata,
419 pjsip_host_info *dest_info );
423 * Swap the request URI and strict route back to the original position
424 * before #pjsip_process_route_set() function is called. If no strict
425 * route URI was found by #pjsip_process_route_set(), this function will
428 * This function should only used internally by PJSIP client authentication
431 * @param tdata Transmit data containing request message.
433 PJ_DECL(void) pjsip_restore_strict_route_set(pjsip_tx_data *tdata);
437 * This structure holds the state of outgoing stateless request.
439 typedef struct pjsip_send_state
441 /** Application token, which was specified when the function
442 * #pjsip_endpt_send_request_stateless() is called.
446 /** Endpoint instance.
448 pjsip_endpoint *endpt;
450 /** Transmit data buffer being sent.
452 pjsip_tx_data *tdata;
454 /** Current transport being used.
456 pjsip_transport *cur_transport;
458 /** The application callback which was specified when the function
459 * #pjsip_endpt_send_request_stateless() was called.
461 void (*app_cb)(struct pjsip_send_state*,
468 * Declaration for callback function to be specified in
469 * #pjsip_endpt_send_request_stateless(), #pjsip_endpt_send_response(), or
470 * #pjsip_endpt_send_response2().
472 * @param st Structure to keep transmission state.
473 * @param sent Number of bytes sent.
474 * @param cont When current transmission fails, specify whether
475 * the function should fallback to next destination.
477 typedef void (*pjsip_send_callback)(pjsip_send_state *st, pj_ssize_t sent,
481 * Send outgoing request statelessly The function will take care of which
482 * destination and transport to use based on the information in the message,
483 * taking care of URI in the request line and Route header.
485 * This function is different than #pjsip_transport_send() in that this
486 * function adds/modify the Via header as necessary.
488 * @param endpt The endpoint instance.
489 * @param tdata The transmit data to be sent.
490 * @param token Arbitrary token to be given back on the callback.
491 * @param cb Optional callback to notify transmission status (also
492 * gives chance for application to discontinue retrying
493 * sending to alternate address).
495 * @return PJ_SUCCESS, or the appropriate error code.
498 pjsip_endpt_send_request_stateless( pjsip_endpoint *endpt,
499 pjsip_tx_data *tdata,
501 pjsip_send_callback cb);
504 * This is a low-level function to send raw data to a destination.
506 * See also #pjsip_endpt_send_raw_to_uri().
508 * @param endpt The SIP endpoint instance.
509 * @param tp_type Transport type.
510 * @param sel Optional pointer to transport selector instance if
511 * application wants to use a specific transport instance
512 * rather then letting transport manager finds the suitable
514 * @param raw_data The data to be sent.
515 * @param data_len The length of the data.
516 * @param addr Destination address.
517 * @param addr_len Length of destination address.
518 * @param token Arbitrary token to be returned back to callback.
519 * @param cb Optional callback to be called to notify caller about
520 * the completion status of the pending send operation.
522 * @return If the message has been sent successfully, this function
523 * will return PJ_SUCCESS and the callback will not be
524 * called. If message cannot be sent immediately, this
525 * function will return PJ_EPENDING, and application will
526 * be notified later about the completion via the callback.
527 * Any statuses other than PJ_SUCCESS or PJ_EPENDING
528 * indicates immediate failure, and in this case the
529 * callback will not be called.
531 PJ_DECL(pj_status_t) pjsip_endpt_send_raw(pjsip_endpoint *endpt,
532 pjsip_transport_type_e tp_type,
533 const pjsip_tpselector *sel,
534 const void *raw_data,
536 const pj_sockaddr_t *addr,
539 pjsip_tp_send_callback cb);
542 * Send raw data to the specified destination URI. The actual destination
543 * address will be calculated from the URI, using normal SIP URI to host
546 * See also #pjsip_endpt_send_raw().
548 * @param endpt The SIP endpoint instance.
549 * @param dst_uri Destination address URI.
550 * @param sel Optional pointer to transport selector instance if
551 * application wants to use a specific transport instance
552 * rather then letting transport manager finds the suitable
554 * @param raw_data The data to be sent.
555 * @param data_len The length of the data.
556 * @param token Arbitrary token to be returned back to callback.
557 * @param cb Optional callback to be called to notify caller about
558 * the completion status of the pending send operation.
560 * @return If the message has been sent successfully, this function
561 * will return PJ_SUCCESS and the callback will not be
562 * called. If message cannot be sent immediately, this
563 * function will return PJ_EPENDING, and application will
564 * be notified later about the completion via the callback.
565 * Any statuses other than PJ_SUCCESS or PJ_EPENDING
566 * indicates immediate failure, and in this case the
567 * callback will not be called.
569 PJ_DECL(pj_status_t) pjsip_endpt_send_raw_to_uri(pjsip_endpoint *endpt,
570 const pj_str_t *dst_uri,
571 const pjsip_tpselector *sel,
572 const void *raw_data,
575 pjsip_tp_send_callback cb);
578 * This structure describes destination information to send response.
579 * It is initialized by calling #pjsip_get_response_addr().
581 * If the response message should be sent using transport from which
582 * the request was received, then transport, addr, and addr_len fields
585 * The dst_host field is also initialized. It should be used when server
586 * fails to send the response using the transport from which the request
587 * was received, or when the transport is NULL, which means server
588 * must send the response to this address (this situation occurs when
589 * maddr parameter is set, or when rport param is not set in the request).
591 typedef struct pjsip_response_addr
593 pjsip_transport *transport; /**< Immediate transport to be used. */
594 pj_sockaddr addr; /**< Immediate address to send to. */
595 int addr_len; /**< Address length. */
596 pjsip_host_info dst_host; /**< Destination host to contact. */
597 } pjsip_response_addr;
600 * Determine which address (and transport) to use to send response message
601 * based on the received request. This function follows the specification
602 * in section 18.2.2 of RFC 3261 and RFC 3581 for calculating the destination
603 * address and transport.
605 * The information about destination to send the response will be returned
606 * in res_addr argument. Please see #pjsip_response_addr for more info.
608 * @param pool The pool.
609 * @param rdata The incoming request received by the server.
610 * @param res_addr On return, it will be initialized with information about
611 * destination address and transport to send the response.
613 * @return zero (PJ_OK) if successfull.
615 PJ_DECL(pj_status_t) pjsip_get_response_addr(pj_pool_t *pool,
616 pjsip_rx_data *rdata,
617 pjsip_response_addr *res_addr);
620 * Send response in tdata statelessly. The function will take care of which
621 * response destination and transport to use based on the information in the
622 * Via header (such as the presence of rport, symmetric transport, etc.).
624 * This function will create a new ephemeral transport if no existing
625 * transports can be used to send the message to the destination. The ephemeral
626 * transport will be destroyed after some period if it is not used to send any
629 * The behavior of this function complies with section 18.2.2 of RFC 3261
632 * @param endpt The endpoint instance.
633 * @param res_addr The information about the address and transport to send
634 * the response to. Application can get this information
635 * by calling #pjsip_get_response_addr().
636 * @param tdata The response message to be sent.
637 * @param token Token to be passed back when the callback is called.
638 * @param cb Optional callback to notify the transmission status
639 * to application, and to inform whether next address or
640 * transport will be tried.
642 * @return PJ_SUCCESS if response has been successfully created and
643 * sent to transport layer, or a non-zero error code.
644 * However, even when it returns PJ_SUCCESS, there is no
645 * guarantee that the response has been successfully sent.
647 PJ_DECL(pj_status_t) pjsip_endpt_send_response( pjsip_endpoint *endpt,
648 pjsip_response_addr *res_addr,
649 pjsip_tx_data *tdata,
651 pjsip_send_callback cb);
654 * This is a convenient function which wraps #pjsip_get_response_addr() and
655 * #pjsip_endpt_send_response() in a single function.
657 * @param endpt The endpoint instance.
658 * @param rdata The original request to be responded.
659 * @param tdata The response message to be sent.
660 * @param token Token to be passed back when the callback is called.
661 * @param cb Optional callback to notify the transmission status
662 * to application, and to inform whether next address or
663 * transport will be tried.
665 * @return PJ_SUCCESS if response has been successfully created and
666 * sent to transport layer, or a non-zero error code.
667 * However, even when it returns PJ_SUCCESS, there is no
668 * guarantee that the response has been successfully sent.
670 PJ_DECL(pj_status_t) pjsip_endpt_send_response2(pjsip_endpoint *endpt,
671 pjsip_rx_data *rdata,
672 pjsip_tx_data *tdata,
674 pjsip_send_callback cb);
677 * This composite function sends response message statelessly to an incoming
678 * request message. Internally it calls #pjsip_endpt_create_response() and
679 * #pjsip_endpt_send_response().
681 * @param endpt The endpoint instance.
682 * @param rdata The incoming request message.
683 * @param st_code Status code of the response.
684 * @param st_text Optional status text of the response.
685 * @param hdr_list Optional header list to be added to the response.
686 * @param body Optional message body to be added to the response.
688 * @return PJ_SUCCESS if response message has successfully been
691 PJ_DECL(pj_status_t) pjsip_endpt_respond_stateless(pjsip_endpoint *endpt,
692 pjsip_rx_data *rdata,
694 const pj_str_t *st_text,
695 const pjsip_hdr *hdr_list,
696 const pjsip_msg_body *body);
703 * @defgroup PJSIP_TRANSACT_UTIL Stateful Operations
704 * @ingroup PJSIP_TRANSACT
705 * @brief Utility function to send requests/responses statefully.
710 * This composite function creates and sends response statefully for the
713 * @param endpt The endpoint instance.
714 * @param tsx_user The module to be registered as transaction user.
715 * @param rdata The incoming request message.
716 * @param st_code Status code of the response.
717 * @param st_text Optional status text of the response.
718 * @param hdr_list Optional header list to be added to the response.
719 * @param body Optional message body to be added to the response.
720 * @param p_tsx Optional pointer to receive the transaction which was
721 * created to send the response.
723 * @return PJ_SUCCESS if response message has successfully been
726 PJ_DECL(pj_status_t) pjsip_endpt_respond( pjsip_endpoint *endpt,
727 pjsip_module *tsx_user,
728 pjsip_rx_data *rdata,
730 const pj_str_t *st_text,
731 const pjsip_hdr *hdr_list,
732 const pjsip_msg_body *body,
733 pjsip_transaction **p_tsx );
736 * Type of callback to be specified in #pjsip_endpt_send_request().
738 * @param token The token that was given in #pjsip_endpt_send_request()
739 * @param e Completion event.
741 typedef void (*pjsip_endpt_send_callback)(void *token, pjsip_event *e);
744 * Send outgoing request and initiate UAC transaction for the request.
745 * This is an auxiliary function to be used by application to send arbitrary
746 * requests outside a dialog. To send a request within a dialog, application
747 * should use #pjsip_dlg_send_request instead.
749 * @param endpt The endpoint instance.
750 * @param tdata The transmit data to be sent.
751 * @param timeout Optional timeout for final response to be received, or -1
752 * if the transaction should not have a timeout restriction.
753 * The value is in miliseconds.
754 * @param token Optional token to be associated with the transaction, and
755 * to be passed to the callback.
756 * @param cb Optional callback to be called when the transaction has
757 * received a final response. The callback will be called with
758 * the previously registered token and the event that triggers
759 * the completion of the transaction.
761 * @return PJ_SUCCESS, or the appropriate error code.
763 PJ_DECL(pj_status_t) pjsip_endpt_send_request( pjsip_endpoint *endpt,
764 pjsip_tx_data *tdata,
767 pjsip_endpt_send_callback cb);
774 * @defgroup PJSIP_PROXY_CORE Core Proxy Layer
775 * @brief Core proxy operations
780 * Create new request message to be forwarded upstream to new destination URI
781 * in uri. The new request is a full/deep clone of the request received in
782 * rdata, unless if other copy mechanism is specified in the options.
783 * The branch parameter, if not NULL, will be used as the branch-param in
784 * the Via header. If it is NULL, then a unique branch parameter will be used.
786 * Note: this function DOES NOT perform Route information preprocessing as
787 * described in RFC 3261 Section 16.4. Application must take care of
788 * removing/updating the Route headers according of the rules as
789 * described in that section.
791 * @param endpt The endpoint instance.
792 * @param rdata The incoming request message.
793 * @param uri The URI where the request will be forwarded to.
794 * @param branch Optional branch parameter. Application may specify its
795 * own branch, for example if it wishes to perform loop
796 * detection. If the branch parameter is not specified,
797 * this function will generate its own by calling
798 * #pjsip_calculate_branch_id() function.
799 * @param options Optional option flags when duplicating the message.
800 * @param tdata The result.
802 * @return PJ_SUCCESS on success.
804 PJ_DECL(pj_status_t) pjsip_endpt_create_request_fwd(pjsip_endpoint *endpt,
805 pjsip_rx_data *rdata,
806 const pjsip_uri *uri,
807 const pj_str_t *branch,
809 pjsip_tx_data **tdata);
814 * Create new response message to be forwarded downstream by the proxy from
815 * the response message found in rdata. Note that this function practically
816 * will clone the response as is, i.e. without checking the validity of the
817 * response or removing top most Via header. This function will perform
818 * full/deep clone of the response, unless other copy mechanism is used in
821 * @param endpt The endpoint instance.
822 * @param rdata The incoming response message.
823 * @param options Optional option flags when duplicate the message.
824 * @param tdata The result
826 * @return PJ_SUCCESS on success.
828 PJ_DECL(pj_status_t) pjsip_endpt_create_response_fwd( pjsip_endpoint *endpt,
829 pjsip_rx_data *rdata,
831 pjsip_tx_data **tdata);
836 * Create a globally unique branch parameter based on the information in
837 * the incoming request message, for the purpose of creating a new request
838 * for forwarding. This is the default implementation used by
839 * #pjsip_endpt_create_request_fwd() function if the branch parameter is
842 * The default implementation here will just create an MD5 hash of the
845 * Note that the returned string was allocated from rdata's pool.
847 * @param rdata The incoming request message.
849 * @return Unique branch-ID string.
851 PJ_DECL(pj_str_t) pjsip_calculate_branch_id( pjsip_rx_data *rdata );
860 #endif /* __PJSIP_SIP_MISC_H__ */