Benny Prijono | 5dcb38d | 2005-11-21 01:55:47 +0000 | [diff] [blame^] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2003-2006 Benny Prijono <benny@prijono.org> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | #ifndef __PJSIP_SIMPLE_MESSAGING_H__ |
| 20 | #define __PJSIP_SIMPLE_MESSAGING_H__ |
| 21 | |
| 22 | /** |
| 23 | * @file messaging.h |
| 24 | * @brief Instant Messaging Extension (RFC 3428) |
| 25 | */ |
| 26 | |
| 27 | #include <pjsip/sip_msg.h> |
| 28 | |
| 29 | PJ_BEGIN_DECL |
| 30 | |
| 31 | /** |
| 32 | * @defgroup PJSIP_MESSAGING SIP Instant Messaging (RFC 3428) Module |
| 33 | * @ingroup PJSIP_SIMPLE |
| 34 | * @{ |
| 35 | * |
| 36 | * This module provides the implementation of SIP Extension for Instant |
| 37 | * Messaging (RFC 3428). It extends PJSIP by supporting MESSAGE method. |
| 38 | * |
| 39 | * The RFC 3428 doesn't provide any means of dialog for the purpose of sending/ |
| 40 | * receiving instant messaging. IM with SIP is basicly sessionless, which means |
| 41 | * that there is absolutely no correlation between IM messages sent or received |
| 42 | * by a host. Any correlation between IM messages is only perceivable by |
| 43 | * user, phsychologically. |
| 44 | * |
| 45 | * However, the RFC doesn't prohibit sending IM within a dialog (presumably |
| 46 | * using the same Call-ID and CSeq namespace), although it prohibits creating |
| 47 | * a dialog specificly for creating IM session. |
| 48 | * |
| 49 | * The implementation here is modeled to support both ways of sending IM msgs, |
| 50 | * i.e. sending IM message individually and sending IM message within a dialog. |
| 51 | * Although IM message can be associated with a dialog, this implementation of |
| 52 | * IM module is completely independent of the User Agent library in PJSIP. Yes, |
| 53 | * that's what is called modularity, and it demonstrates the clearness |
| 54 | * of PJSIP design (the last sentence is of course marketing crap :)). |
| 55 | * |
| 56 | * To send an IM message as part of dialog, application would first create the |
| 57 | * message using #pjsip_messaging_create_msg, using dialog's Call-ID, CSeq, |
| 58 | * From, and To header, then send the message using #pjsip_dlg_send_msg instead |
| 59 | * of #pjsip_messaging_send_msg. |
| 60 | * |
| 61 | * To send IM messages individually, application has two options. The first is |
| 62 | * to create the request with #pjsip_messaging_create_msg then send it with |
| 63 | * #pjsip_messaging_send_msg. But this way, application has to pre-construct |
| 64 | * From and To header first, which is not too convenient. |
| 65 | * |
| 66 | * The second option (to send IM messages not associated with a dialog) is to |
| 67 | * first create an 'IM session'. An 'IM session' here is not a SIP dialog, as |
| 68 | * it doesn't have Contact header etc. An 'IM session' here is just a local |
| 69 | * state to cache most of IM headers, for convenience and optimization. Appl |
| 70 | * creates an IM session with #pjsip_messaging_create_session, and destroy |
| 71 | * the session with #pjsip_messaging_destroy_session. To create an outgoing |
| 72 | * IM message, application would call #pjsip_messaging_session_create_msg, |
| 73 | * and to send the message it would use #pjsip_messaging_send_msg. |
| 74 | * |
| 75 | * Message authorization is handled by application, as usual, by inserting a |
| 76 | * proper WWW-Authenticate or Proxy-Authenticate header before sending the |
| 77 | * message. |
| 78 | * |
| 79 | * And the last bit, to handle incoing IM messages. |
| 80 | * |
| 81 | * To handle incoming IM messages, application would register a global callback |
| 82 | * to be called when incoming messages arrive, by registering with function |
| 83 | * #pjsip_messaging_set_incoming_callback. This will be the global callback |
| 84 | * for all incoming IM messages. Although the message was sent as part of |
| 85 | * a dialog, it would still come here. And as long as the request has proper |
| 86 | * identification (Call-ID, From/To tag), the dialog will be aware of the |
| 87 | * request and update it's state (remote CSeq) accordingly. |
| 88 | */ |
| 89 | |
| 90 | |
| 91 | |
| 92 | /** |
| 93 | * Typedef for callback to be called when outgoing message has been sent |
| 94 | * and a final response has been received. |
| 95 | */ |
| 96 | typedef void (*pjsip_messaging_cb)(void *token, int status_code); |
| 97 | |
| 98 | /** |
| 99 | * Typedef for callback to receive incoming message. |
| 100 | * |
| 101 | * @param rdata Incoming message data. |
| 102 | * |
| 103 | * @return The status code to be returned back to original sender. |
| 104 | * Application must return a final status code upon returning |
| 105 | * from this function, or otherwise the stack will respond |
| 106 | * with error. |
| 107 | */ |
| 108 | typedef int (*pjsip_on_new_msg_cb)(pjsip_rx_data *rdata); |
| 109 | |
| 110 | /** |
| 111 | * Opaque data type for instant messaging session. |
| 112 | */ |
| 113 | typedef struct pjsip_messaging_session pjsip_messaging_session; |
| 114 | |
| 115 | /** |
| 116 | * Get the messaging module. |
| 117 | * |
| 118 | * @return SIP module. |
| 119 | */ |
| 120 | PJ_DECL(pjsip_module*) pjsip_messaging_get_module(); |
| 121 | |
| 122 | /** |
| 123 | * Set the global callback to be called when incoming message is received. |
| 124 | * |
| 125 | * @param cb The callback to be called when incoming message is received. |
| 126 | * |
| 127 | * @return The previous callback. |
| 128 | */ |
| 129 | PJ_DECL(pjsip_on_new_msg_cb) |
| 130 | pjsip_messaging_set_incoming_callback(pjsip_on_new_msg_cb cb); |
| 131 | |
| 132 | |
| 133 | /** |
| 134 | * Create an instant message transmit data buffer using the specified arguments. |
| 135 | * The returned transmit data buffers will have it's reference counter set |
| 136 | * to 1, and when application send the buffer, the send function will decrement |
| 137 | * the reference counter. When the reference counter reach zero, the buffer |
| 138 | * will be deleted. As long as the function does not increment the buffer's |
| 139 | * reference counter between creating and sending the request, the buffer |
| 140 | * will always be deleted and no memory leak will occur. |
| 141 | * |
| 142 | * @param endpt Endpoint instance. |
| 143 | * @param target Target URL. |
| 144 | * @param from The "From" header, which content will be copied to request. |
| 145 | * If the "From" header doesn't have a tag parameter, the |
| 146 | * function will generate one. |
| 147 | * @param to The "To" header, which content will be copied to request. |
| 148 | * @param call_id Optionally specify Call-ID, or put NULL to make this |
| 149 | * function generate a unique Call-ID automatically. |
| 150 | * @param cseq Optionally specify CSeq, or put -1 to make this function |
| 151 | * generate a random CSeq. |
| 152 | * @param text Optionally specify "text/plain" message body, or put NULL |
| 153 | * if application wants to put body other than "text/plain" |
| 154 | * manually. |
| 155 | * |
| 156 | * @return SIP transmit data buffer, which reference count has been |
| 157 | * set to 1. |
| 158 | */ |
| 159 | PJ_DECL(pjsip_tx_data*) |
| 160 | pjsip_messaging_create_msg_from_hdr(pjsip_endpoint *endpt, |
| 161 | const pjsip_uri *target, |
| 162 | const pjsip_from_hdr *from, |
| 163 | const pjsip_to_hdr *to, |
| 164 | const pjsip_cid_hdr *call_id, |
| 165 | int cseq, |
| 166 | const pj_str_t *text); |
| 167 | |
| 168 | /** |
| 169 | * Create instant message, by specifying URL string for both From and To header. |
| 170 | * |
| 171 | * @param endpt Endpoint instance. |
| 172 | * @param target Target URL. |
| 173 | * @param from URL of the sender. |
| 174 | * @param to URL of the recipient. |
| 175 | * @param call_id Optionally specify Call-ID, or put NULL to make this |
| 176 | * function generate a unique Call-ID automatically. |
| 177 | * @param cseq Optionally specify CSeq, or put -1 to make this function |
| 178 | * generate a random CSeq. |
| 179 | * @param text Optionally specify "text/plain" message body, or put NULL |
| 180 | * if application wants to put body other than "text/plain" |
| 181 | * manually. |
| 182 | * |
| 183 | * @return SIP transmit data buffer, which reference count has been |
| 184 | * set to 1. |
| 185 | */ |
| 186 | PJ_DECL(pjsip_tx_data*) pjsip_messaging_create_msg( pjsip_endpoint *endpt, |
| 187 | const pj_str_t *target, |
| 188 | const pj_str_t *from, |
| 189 | const pj_str_t *to, |
| 190 | const pj_str_t *call_id, |
| 191 | int cseq, |
| 192 | const pj_str_t *text); |
| 193 | |
| 194 | /** |
| 195 | * Send the instant message transmit buffer and attach a callback to be called |
| 196 | * when the request has received a final response. This function will decrement |
| 197 | * the transmit buffer's reference counter, and when the reference counter |
| 198 | * reach zero, the buffer will be deleted. As long as the function does not |
| 199 | * increment the buffer's reference counter between creating the request and |
| 200 | * calling this function, the buffer will always be deleted regardless whether |
| 201 | * the sending was failed or succeeded. |
| 202 | * |
| 203 | * @param endpt Endpoint instance. |
| 204 | * @param tdata Transmit data buffer. |
| 205 | * @param token Token to be associated with the SIP transaction which sends |
| 206 | * this request. |
| 207 | * @param cb The callback to be called when the SIP request has received |
| 208 | * a final response from destination. |
| 209 | * |
| 210 | * @return Zero if the transaction was started successfully. Note that |
| 211 | * this doesn't mean the request has been received successfully |
| 212 | * by remote recipient. |
| 213 | */ |
| 214 | PJ_DECL(pj_status_t) pjsip_messaging_send_msg( pjsip_endpoint *endpt, |
| 215 | pjsip_tx_data *tdata, |
| 216 | void *token, |
| 217 | pjsip_messaging_cb cb ); |
| 218 | |
| 219 | /** |
| 220 | * Create an instant messaging session, which can conveniently be used to send |
| 221 | * multiple instant messages to the same recipient. |
| 222 | * |
| 223 | * @param endpt Endpoint instance. |
| 224 | * @param from URI of sender. The function will add a unique tag parameter |
| 225 | * to this URI in the From header. |
| 226 | * @param to URI of recipient. |
| 227 | * |
| 228 | * @return Messaging session. |
| 229 | */ |
| 230 | PJ_DECL(pjsip_messaging_session*) |
| 231 | pjsip_messaging_create_session( pjsip_endpoint *endpt, |
| 232 | const pj_str_t *from, |
| 233 | const pj_str_t *to ); |
| 234 | |
| 235 | /** |
| 236 | * Create an instant message using instant messaging session, and optionally |
| 237 | * attach a text message. |
| 238 | * |
| 239 | * @param ses The instant messaging session. |
| 240 | * @param text Optional "text/plain" message to be attached as the |
| 241 | * message body. If this parameter is NULL, then no message |
| 242 | * body will be created, and application can attach any |
| 243 | * type of message body before the request is sent. |
| 244 | * |
| 245 | * @return SIP transmit data buffer, which reference counter has been |
| 246 | * set to 1. |
| 247 | */ |
| 248 | PJ_DECL(pjsip_tx_data*) |
| 249 | pjsip_messaging_session_create_msg( pjsip_messaging_session *ses, |
| 250 | const pj_str_t *text ); |
| 251 | |
| 252 | /** |
| 253 | * Destroy an instant messaging session. |
| 254 | * |
| 255 | * @param ses The instant messaging session. |
| 256 | * |
| 257 | * @return Zero on successfull. |
| 258 | */ |
| 259 | PJ_DECL(pj_status_t) |
| 260 | pjsip_messaging_destroy_session( pjsip_messaging_session *ses ); |
| 261 | |
| 262 | /** |
| 263 | * @} |
| 264 | */ |
| 265 | |
| 266 | PJ_END_DECL |
| 267 | |
| 268 | #endif |