/* $Id$ */ /* * Copyright (C) 2008-2009 Teluu Inc. (http://www.teluu.com) * Copyright (C) 2003-2008 Benny Prijono * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef __PJSIP_SIP_MISC_H__ #define __PJSIP_SIP_MISC_H__ #include #include #include PJ_BEGIN_DECL /** * @defgroup PJSIP_ENDPT_TARGET_URI Target URI Management * @ingroup PJSIP_CORE_CORE * @brief Management of target URI's in case of redirection * @{ * This module provides utility functions to manage target set for UAC. * The target set is provided as pjsip_target_set structure. Initially, * the target set for UAC contains only one target, that is the target of * the initial request. When 3xx/redirection class response is received, * the UAC can use the functionality of this module to add the URI's listed * in the Contact header(s) in the response to the target set, and retry * sending the request to the next destination/target. The UAC may retry * this sequentially until one of the target answers with succesful/2xx * response, or one target returns global error/6xx response, or all targets * are exhausted. * * This module is currently used by the \ref PJSIP_INV. */ /** * This structure describes a target, which can be chained together to form * a target set. Each target contains an URI, priority (as q-value), and * the last status code and reason phrase received from the target, if the * target has been contacted. If the target has not been contacted, the * status code field will be zero. */ typedef struct pjsip_target { PJ_DECL_LIST_MEMBER(struct pjsip_target);/**< Standard list element */ pjsip_uri *uri; /**< The target URI */ int q1000; /**< q-value multiplied by 1000 */ pjsip_status_code code; /**< Last status code received */ pj_str_t reason; /**< Last reason phrase received */ } pjsip_target; /** * This describes a target set. A target set contains a linked-list of * pjsip_target. */ typedef struct pjsip_target_set { pjsip_target head; /**< Target linked-list head */ pjsip_target *current; /**< Current target. */ } pjsip_target_set; /** * These enumerations specify the action to be performed to a redirect * response. */ typedef enum pjsip_redirect_op { /** * Reject the redirection to the current target. The UAC will * select the next target from the target set if exists. */ PJSIP_REDIRECT_REJECT, /** * Accept the redirection to the current target. The INVITE request * will be resent to the current target. */ PJSIP_REDIRECT_ACCEPT, /** * Defer the redirection decision, for example to request permission * from the end user. */ PJSIP_REDIRECT_PENDING, /** * Stop the whole redirection process altogether. This will cause * the invite session to be disconnected. */ PJSIP_REDIRECT_STOP } pjsip_redirect_op; /** * Initialize target set. This will empty the list of targets in the * target set. * * @param tset The target set. */ PJ_INLINE(void) pjsip_target_set_init(pjsip_target_set *tset) { pj_list_init(&tset->head); tset->current = NULL; } /** * Add an URI to the target set, if the URI is not already in the target set. * The URI comparison rule of pjsip_uri_cmp() will be used to determine the * equality of this URI compared to existing URI's in the target set. The * URI will be cloned using the specified memory pool before it is added to * the list. * * The first URI added to the target set will also be made current target * by this function. * * @param tset The target set. * @param pool The memory pool to be used to duplicate the URI. * @param uri The URI to be checked and added. * @param q1000 The q-value multiplied by 1000. * * @return PJ_SUCCESS if the URI was added to the target set, * or PJ_EEXISTS if the URI already exists in the target * set, or other error codes. */ PJ_DECL(pj_status_t) pjsip_target_set_add_uri(pjsip_target_set *tset, pj_pool_t *pool, const pjsip_uri *uri, int q1000); /** * Extract URI's in the Contact headers of the specified (response) message * and add them to the target set. This function will also check if the * URI's already exist in the target set before adding them to the list. * * @param tset The target set. * @param pool The memory pool to be used to duplicate the URI's. * @param msg SIP message from which the Contact headers will be * scanned and the URI's to be extracted, checked, and * added to the target set. * * @return PJ_SUCCESS if at least one URI was added to the * target set, or PJ_EEXISTS if all URI's in the message * already exists in the target set or if the message * doesn't contain usable Contact headers, or other error * codes. */ PJ_DECL(pj_status_t) pjsip_target_set_add_from_msg(pjsip_target_set *tset, pj_pool_t *pool, const pjsip_msg *msg); /** * Get the next target to be retried. This function will scan the target set * for target which hasn't been tried, and return one target with the * highest q-value, if such target exists. This function will return NULL * if there is one target with 2xx or 6xx code or if all targets have been * tried. * * @param tset The target set. * * @return The next target to be tried, or NULL if all targets have * been tried or at least one target returns 2xx or 6xx * response. */ PJ_DECL(pjsip_target*) pjsip_target_set_get_next(const pjsip_target_set *tset); /** * Set the specified target as the current target in the target set. The * current target may be used by application to keep track on which target * is currently being operated on. * * @param tset The target set. * @param target The target to be set as current target. * * @return PJ_SUCCESS or the appropriate error code. */ PJ_DECL(pj_status_t) pjsip_target_set_set_current(pjsip_target_set *tset, pjsip_target *target); /** * Set the status code and reason phrase of the specified target. * * @param target The target. * @param pool The memory pool to be used to duplicate the reason phrase. * @param code The SIP status code to be set to the target. * @param reason The reason phrase to be set to the target. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjsip_target_assign_status(pjsip_target *target, pj_pool_t *pool, int status_code, const pj_str_t *reason); /** * @} */ /** * @defgroup PJSIP_ENDPT_STATELESS Message Creation and Stateless Operations * @ingroup PJSIP_CORE_CORE * @brief Utilities to create various messages and base function to send messages. * @{ */ /** * Create an independent request message. This can be used to build any * request outside a dialog, such as OPTIONS, MESSAGE, etc. To create a request * inside a dialog, application should use #pjsip_dlg_create_request. * * This function adds the following headers in the request: * - From, To, Call-ID, and CSeq, * - Contact header, if contact is specified. * - A blank Via header. * - Additional request headers (such as Max-Forwards) which are copied * from endpoint configuration. * * In addition, the function adds a unique tag in the From header. * * Once a transmit data is created, the reference counter is initialized to 1. * * @param endpt Endpoint instance. * @param method SIP Method. * @param target Target URI. * @param from URL to put in From header. * @param to URL to put in To header. * @param contact URL to put in Contact header. * @param call_id Optional Call-ID (put NULL to generate unique Call-ID). * @param cseq Optional CSeq (put -1 to generate random CSeq). * @param text Optional text body (put NULL to omit body). * @param p_tdata Pointer to receive the transmit data. * * @return PJ_SUCCESS, or the appropriate error code. */ PJ_DECL(pj_status_t) pjsip_endpt_create_request( pjsip_endpoint *endpt, const pjsip_method *method, const pj_str_t *target, const pj_str_t *from, const pj_str_t *to, const pj_str_t *contact, const pj_str_t *call_id, int cseq, const pj_str_t *text, pjsip_tx_data **p_tdata); /** * Create an independent request message from the specified headers. This * function will clone the headers and put them in the request. * * This function adds the following headers in the request: * - From, To, Call-ID, and CSeq, * - Contact header, if contact is specified. * - A blank Via header. * - Additional request headers (such as Max-Forwards) which are copied * from endpoint configuration. * * In addition, the function adds a unique tag in the From header. * * Once a transmit data is created, the reference counter is initialized to 1. * * @param endpt Endpoint instance. * @param method SIP Method. * @param target Target URI. * @param from URL to put in From header. * @param to URL to put in To header. * @param contact URL to put in Contact header. * @param call_id Optional Call-ID (put NULL to generate unique Call-ID). * @param cseq Optional CSeq (put -1 to generate random CSeq). * @param text Optional text body (put NULL to omit body). * @param p_tdata Pointer to receive the transmit data. * * @return PJ_SUCCESS, or the appropriate error code. */ PJ_DECL(pj_status_t) pjsip_endpt_create_request_from_hdr( pjsip_endpoint *endpt, const pjsip_method *method, const pjsip_uri *target, const pjsip_from_hdr *from, const pjsip_to_hdr *to, const pjsip_contact_hdr *contact, const pjsip_cid_hdr *call_id, int cseq, const pj_str_t *text, pjsip_tx_data **p_tdata); /** * Construct a minimal response message for the received request. This function * will construct all the Via, Record-Route, Call-ID, From, To, CSeq, and * Call-ID headers from the request. * * Note: the txdata reference counter is set to ZERO!. * * @param endpt The endpoint. * @param rdata The request receive data. * @param st_code Status code to be put in the response. * @param st_text Optional status text, or NULL to get the default text. * @param p_tdata Pointer to receive the transmit data. * * @return PJ_SUCCESS, or the appropriate error code. */ PJ_DECL(pj_status_t) pjsip_endpt_create_response( pjsip_endpoint *endpt, const pjsip_rx_data *rdata, int st_code, const pj_str_t *st_text, pjsip_tx_data **p_tdata); /** * Construct a full ACK request for the received non-2xx final response. * This utility function is normally called by the transaction to construct * an ACK request to 3xx-6xx final response. * The generation of ACK message for 2xx final response is different than * this one. * * @param endpt The endpoint. * @param tdata This contains the original INVITE request * @param rdata The final response. * @param ack The ACK request created. * * @return PJ_SUCCESS, or the appropriate error code. */ PJ_DECL(pj_status_t) pjsip_endpt_create_ack( pjsip_endpoint *endpt, const pjsip_tx_data *tdata, const pjsip_rx_data *rdata, pjsip_tx_data **ack); /** * Construct CANCEL request for the previously sent request. * * @param endpt The endpoint. * @param tdata The transmit buffer for the request being cancelled. * @param p_tdata Pointer to receive the transmit data. * * @return PJ_SUCCESS, or the appropriate error code. */ PJ_DECL(pj_status_t) pjsip_endpt_create_cancel( pjsip_endpoint *endpt, const pjsip_tx_data *tdata, pjsip_tx_data **p_tdata); /** * Find which destination to be used to send the request message, based * on the request URI and Route headers in the message. The procedure * used here follows the guidelines on sending the request in RFC 3261 * chapter 8.1.2. * * Note there was a change in the behavior of this function since version * 0.5.10.2. Previously this function may modify the request when strict * route is present (to update request URI and route-set). This is no * longer the case now, and this process is done in separate function * (see #pjsip_process_route_set()). * * @param tdata The transmit data containing the request message. * @param dest_info On return, it contains information about destination * host to contact, along with the preferable transport * type, if any. Caller will then normally proceed with * resolving this host with server resolution procedure * described in RFC 3263. * * @return PJ_SUCCESS, or the appropriate error code. * * @see pjsip_process_route_set */ PJ_DECL(pj_status_t) pjsip_get_request_dest(const pjsip_tx_data *tdata, pjsip_host_info *dest_info ); /** * Process route-set found in the request and calculate destination to be * used to send the request message, based on the request URI and Route * headers in the message. The procedure used here follows the guidelines * on sending the request in RFC 3261 chapter 8.1.2. * * This function may modify the message (request line and Route headers), * if the Route information specifies strict routing and the request * URI in the message is different than the calculated target URI. In that * case, the target URI will be put as the request URI of the request and * current request URI will be put as the last entry of the Route headers. * * @param tdata The transmit data containing the request message. * @param dest_info On return, it contains information about destination * host to contact, along with the preferable transport * type, if any. Caller will then normally proceed with * resolving this host with server resolution procedure * described in RFC 3263. * * @return PJ_SUCCESS, or the appropriate error code. * * @see pjsip_get_request_addr */ PJ_DECL(pj_status_t) pjsip_process_route_set(pjsip_tx_data *tdata, pjsip_host_info *dest_info ); /** * Swap the request URI and strict route back to the original position * before #pjsip_process_route_set() function is called. If no strict * route URI was found by #pjsip_process_route_set(), this function will * do nothing. * * This function should only used internally by PJSIP client authentication * module. * * @param tdata Transmit data containing request message. */ PJ_DECL(void) pjsip_restore_strict_route_set(pjsip_tx_data *tdata); /** * This structure holds the state of outgoing stateless request. */ typedef struct pjsip_send_state { /** Application token, which was specified when the function * #pjsip_endpt_send_request_stateless() is called. */ void *token; /** Endpoint instance. */ pjsip_endpoint *endpt; /** Transmit data buffer being sent. */ pjsip_tx_data *tdata; /** Server addresses resolved. */ pjsip_server_addresses addr; /** Current server address being tried. */ unsigned cur_addr; /** Current transport being used. */ pjsip_transport *cur_transport; /** The application callback which was specified when the function * #pjsip_endpt_send_request_stateless() was called. */ void (*app_cb)(struct pjsip_send_state*, pj_ssize_t sent, pj_bool_t *cont); } pjsip_send_state; /** * Declaration for callback function to be specified in * #pjsip_endpt_send_request_stateless(), #pjsip_endpt_send_response(), or * #pjsip_endpt_send_response2(). * * @param st Structure to keep transmission state. * @param sent Number of bytes sent. * @param cont When current transmission fails, specify whether * the function should fallback to next destination. */ typedef void (*pjsip_send_callback)(pjsip_send_state *st, pj_ssize_t sent, pj_bool_t *cont); /** * Send outgoing request statelessly The function will take care of which * destination and transport to use based on the information in the message, * taking care of URI in the request line and Route header. * * This function is different than #pjsip_transport_send() in that this * function adds/modify the Via header as necessary. * * @param endpt The endpoint instance. * @param tdata The transmit data to be sent. * @param token Arbitrary token to be given back on the callback. * @param cb Optional callback to notify transmission status (also * gives chance for application to discontinue retrying * sending to alternate address). * * @return PJ_SUCCESS, or the appropriate error code. */ PJ_DECL(pj_status_t) pjsip_endpt_send_request_stateless( pjsip_endpoint *endpt, pjsip_tx_data *tdata, void *token, pjsip_send_callback cb); /** * This is a low-level function to send raw data to a destination. * * See also #pjsip_endpt_send_raw_to_uri(). * * @param endpt The SIP endpoint instance. * @param tp_type Transport type. * @param sel Optional pointer to transport selector instance if * application wants to use a specific transport instance * rather then letting transport manager finds the suitable * transport.. * @param raw_data The data to be sent. * @param data_len The length of the data. * @param addr Destination address. * @param addr_len Length of destination address. * @param token Arbitrary token to be returned back to callback. * @param cb Optional callback to be called to notify caller about * the completion status of the pending send operation. * * @return If the message has been sent successfully, this function * will return PJ_SUCCESS and the callback will not be * called. If message cannot be sent immediately, this * function will return PJ_EPENDING, and application will * be notified later about the completion via the callback. * Any statuses other than PJ_SUCCESS or PJ_EPENDING * indicates immediate failure, and in this case the * callback will not be called. */ PJ_DECL(pj_status_t) pjsip_endpt_send_raw(pjsip_endpoint *endpt, pjsip_transport_type_e tp_type, const pjsip_tpselector *sel, const void *raw_data, pj_size_t data_len, const pj_sockaddr_t *addr, int addr_len, void *token, pjsip_tp_send_callback cb); /** * Send raw data to the specified destination URI. The actual destination * address will be calculated from the URI, using normal SIP URI to host * resolution. * * See also #pjsip_endpt_send_raw(). * * @param endpt The SIP endpoint instance. * @param dst_uri Destination address URI. * @param sel Optional pointer to transport selector instance if * application wants to use a specific transport instance * rather then letting transport manager finds the suitable * transport.. * @param raw_data The data to be sent. * @param data_len The length of the data. * @param token Arbitrary token to be returned back to callback. * @param cb Optional callback to be called to notify caller about * the completion status of the pending send operation. * * @return If the message has been sent successfully, this function * will return PJ_SUCCESS and the callback will not be * called. If message cannot be sent immediately, this * function will return PJ_EPENDING, and application will * be notified later about the completion via the callback. * Any statuses other than PJ_SUCCESS or PJ_EPENDING * indicates immediate failure, and in this case the * callback will not be called. */ PJ_DECL(pj_status_t) pjsip_endpt_send_raw_to_uri(pjsip_endpoint *endpt, const pj_str_t *dst_uri, const pjsip_tpselector *sel, const void *raw_data, pj_size_t data_len, void *token, pjsip_tp_send_callback cb); /** * This structure describes destination information to send response. * It is initialized by calling #pjsip_get_response_addr(). * * If the response message should be sent using transport from which * the request was received, then transport, addr, and addr_len fields * are initialized. * * The dst_host field is also initialized. It should be used when server * fails to send the response using the transport from which the request * was received, or when the transport is NULL, which means server * must send the response to this address (this situation occurs when * maddr parameter is set, or when rport param is not set in the request). */ typedef struct pjsip_response_addr { pjsip_transport *transport; /**< Immediate transport to be used. */ pj_sockaddr addr; /**< Immediate address to send to. */ int addr_len; /**< Address length. */ pjsip_host_info dst_host; /**< Destination host to contact. */ } pjsip_response_addr; /** * Determine which address (and transport) to use to send response message * based on the received request. This function follows the specification * in section 18.2.2 of RFC 3261 and RFC 3581 for calculating the destination * address and transport. * * The information about destination to send the response will be returned * in res_addr argument. Please see #pjsip_response_addr for more info. * * @param pool The pool. * @param rdata The incoming request received by the server. * @param res_addr On return, it will be initialized with information about * destination address and transport to send the response. * * @return zero (PJ_OK) if successfull. */ PJ_DECL(pj_status_t) pjsip_get_response_addr(pj_pool_t *pool, pjsip_rx_data *rdata, pjsip_response_addr *res_addr); /** * Send response in tdata statelessly. The function will take care of which * response destination and transport to use based on the information in the * Via header (such as the presence of rport, symmetric transport, etc.). * * This function will create a new ephemeral transport if no existing * transports can be used to send the message to the destination. The ephemeral * transport will be destroyed after some period if it is not used to send any * more messages. * * The behavior of this function complies with section 18.2.2 of RFC 3261 * and RFC 3581. * * @param endpt The endpoint instance. * @param res_addr The information about the address and transport to send * the response to. Application can get this information * by calling #pjsip_get_response_addr(). * @param tdata The response message to be sent. * @param token Token to be passed back when the callback is called. * @param cb Optional callback to notify the transmission status * to application, and to inform whether next address or * transport will be tried. * * @return PJ_SUCCESS if response has been successfully created and * sent to transport layer, or a non-zero error code. * However, even when it returns PJ_SUCCESS, there is no * guarantee that the response has been successfully sent. */ PJ_DECL(pj_status_t) pjsip_endpt_send_response( pjsip_endpoint *endpt, pjsip_response_addr *res_addr, pjsip_tx_data *tdata, void *token, pjsip_send_callback cb); /** * This is a convenient function which wraps #pjsip_get_response_addr() and * #pjsip_endpt_send_response() in a single function. * * @param endpt The endpoint instance. * @param rdata The original request to be responded. * @param tdata The response message to be sent. * @param token Token to be passed back when the callback is called. * @param cb Optional callback to notify the transmission status * to application, and to inform whether next address or * transport will be tried. * * @return PJ_SUCCESS if response has been successfully created and * sent to transport layer, or a non-zero error code. * However, even when it returns PJ_SUCCESS, there is no * guarantee that the response has been successfully sent. */ PJ_DECL(pj_status_t) pjsip_endpt_send_response2(pjsip_endpoint *endpt, pjsip_rx_data *rdata, pjsip_tx_data *tdata, void *token, pjsip_send_callback cb); /** * This composite function sends response message statelessly to an incoming * request message. Internally it calls #pjsip_endpt_create_response() and * #pjsip_endpt_send_response(). * * @param endpt The endpoint instance. * @param rdata The incoming request message. * @param st_code Status code of the response. * @param st_text Optional status text of the response. * @param hdr_list Optional header list to be added to the response. * @param body Optional message body to be added to the response. * * @return PJ_SUCCESS if response message has successfully been * sent. */ PJ_DECL(pj_status_t) pjsip_endpt_respond_stateless(pjsip_endpoint *endpt, pjsip_rx_data *rdata, int st_code, const pj_str_t *st_text, const pjsip_hdr *hdr_list, const pjsip_msg_body *body); /** * @} */ /** * @defgroup PJSIP_TRANSACT_UTIL Stateful Operations * @ingroup PJSIP_TRANSACT * @brief Utility function to send requests/responses statefully. * @{ */ /** * This composite function creates and sends response statefully for the * incoming request. * * @param endpt The endpoint instance. * @param tsx_user The module to be registered as transaction user. * @param rdata The incoming request message. * @param st_code Status code of the response. * @param st_text Optional status text of the response. * @param hdr_list Optional header list to be added to the response. * @param body Optional message body to be added to the response. * @param p_tsx Optional pointer to receive the transaction which was * created to send the response. * * @return PJ_SUCCESS if response message has successfully been * created. */ PJ_DECL(pj_status_t) pjsip_endpt_respond( pjsip_endpoint *endpt, pjsip_module *tsx_user, pjsip_rx_data *rdata, int st_code, const pj_str_t *st_text, const pjsip_hdr *hdr_list, const pjsip_msg_body *body, pjsip_transaction **p_tsx ); /** * Type of callback to be specified in #pjsip_endpt_send_request(). * * @param token The token that was given in #pjsip_endpt_send_request() * @param e Completion event. */ typedef void (*pjsip_endpt_send_callback)(void *token, pjsip_event *e); /** * Send outgoing request and initiate UAC transaction for the request. * This is an auxiliary function to be used by application to send arbitrary * requests outside a dialog. To send a request within a dialog, application * should use #pjsip_dlg_send_request instead. * * @param endpt The endpoint instance. * @param tdata The transmit data to be sent. * @param timeout Optional timeout for final response to be received, or -1 * if the transaction should not have a timeout restriction. * The value is in miliseconds. * @param token Optional token to be associated with the transaction, and * to be passed to the callback. * @param cb Optional callback to be called when the transaction has * received a final response. The callback will be called with * the previously registered token and the event that triggers * the completion of the transaction. * * @return PJ_SUCCESS, or the appropriate error code. */ PJ_DECL(pj_status_t) pjsip_endpt_send_request( pjsip_endpoint *endpt, pjsip_tx_data *tdata, pj_int32_t timeout, void *token, pjsip_endpt_send_callback cb); /** * @} */ /** * @defgroup PJSIP_PROXY_CORE Core Proxy Layer * @brief Core proxy operations * @{ */ /** * Create new request message to be forwarded upstream to new destination URI * in uri. The new request is a full/deep clone of the request received in * rdata, unless if other copy mechanism is specified in the options. * The branch parameter, if not NULL, will be used as the branch-param in * the Via header. If it is NULL, then a unique branch parameter will be used. * * Note: this function DOES NOT perform Route information preprocessing as * described in RFC 3261 Section 16.4. Application must take care of * removing/updating the Route headers according of the rules as * described in that section. * * @param endpt The endpoint instance. * @param rdata The incoming request message. * @param uri The URI where the request will be forwarded to. * @param branch Optional branch parameter. Application may specify its * own branch, for example if it wishes to perform loop * detection. If the branch parameter is not specified, * this function will generate its own by calling * #pjsip_calculate_branch_id() function. * @param options Optional option flags when duplicating the message. * @param tdata The result. * * @return PJ_SUCCESS on success. */ PJ_DECL(pj_status_t) pjsip_endpt_create_request_fwd(pjsip_endpoint *endpt, pjsip_rx_data *rdata, const pjsip_uri *uri, const pj_str_t *branch, unsigned options, pjsip_tx_data **tdata); /** * Create new response message to be forwarded downstream by the proxy from * the response message found in rdata. Note that this function practically * will clone the response as is, i.e. without checking the validity of the * response or removing top most Via header. This function will perform * full/deep clone of the response, unless other copy mechanism is used in * the options. * * @param endpt The endpoint instance. * @param rdata The incoming response message. * @param options Optional option flags when duplicate the message. * @param tdata The result * * @return PJ_SUCCESS on success. */ PJ_DECL(pj_status_t) pjsip_endpt_create_response_fwd( pjsip_endpoint *endpt, pjsip_rx_data *rdata, unsigned options, pjsip_tx_data **tdata); /** * Create a globally unique branch parameter based on the information in * the incoming request message, for the purpose of creating a new request * for forwarding. This is the default implementation used by * #pjsip_endpt_create_request_fwd() function if the branch parameter is * not specified. * * The default implementation here will just create an MD5 hash of the * top-most Via. * * Note that the returned string was allocated from rdata's pool. * * @param rdata The incoming request message. * * @return Unique branch-ID string. */ PJ_DECL(pj_str_t) pjsip_calculate_branch_id( pjsip_rx_data *rdata ); /** * @} */ PJ_END_DECL #endif /* __PJSIP_SIP_MISC_H__ */