Benny Prijono | 0a749f1 | 2005-10-31 21:02:30 +0000 | [diff] [blame^] | 1 | /* $Header: /pjproject/pjsip/src/pjsip_simple/messaging.c 7 8/31/05 9:05p Bennylp $ */
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| 2 | #include <pjsip_simple/messaging.h>
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| 3 | #include <pjsip/sip_endpoint.h>
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| 4 | #include <pjsip/sip_parser.h>
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| 5 | #include <pjsip/sip_transaction.h>
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| 6 | #include <pjsip/sip_event.h>
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| 7 | #include <pjsip/sip_module.h>
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| 8 | #include <pjsip/sip_misc.h>
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| 9 | #include <pj/string.h>
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| 10 | #include <pj/pool.h>
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| 11 | #include <pj/guid.h>
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| 12 | #include <pj/string.h>
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| 13 | #include <pj/log.h>
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| 14 | #include <stdio.h>
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| 15 | #include <stdlib.h>
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| 16 |
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| 17 | #define THIS_FILE "messaging"
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| 18 |
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| 19 | struct messaging_data
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| 20 | {
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| 21 | void *token;
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| 22 | pjsip_messaging_cb cb;
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| 23 | };
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| 24 |
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| 25 | struct pjsip_messaging_session
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| 26 | {
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| 27 | pj_pool_t *pool;
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| 28 | pjsip_endpoint *endpt;
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| 29 | pjsip_from_hdr *from;
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| 30 | pjsip_to_hdr *to;
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| 31 | pjsip_cid_hdr *call_id;
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| 32 | pjsip_cseq_hdr *cseq;
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| 33 | };
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| 34 |
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| 35 | static int module_id;
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| 36 | static pjsip_on_new_msg_cb incoming_cb;
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| 37 | static pjsip_method message_method;
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| 38 |
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| 39 |
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| 40 | /*
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| 41 | * Set global callback to receive incoming message.
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| 42 | */
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| 43 | PJ_DEF(pjsip_on_new_msg_cb)
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| 44 | pjsip_messaging_set_incoming_callback(pjsip_on_new_msg_cb cb)
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| 45 | {
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| 46 | pjsip_on_new_msg_cb prev_cb = incoming_cb;
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| 47 | incoming_cb = cb;
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| 48 | return prev_cb;
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| 49 | }
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| 50 |
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| 51 |
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| 52 | /*
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| 53 | * Create an independent message (ie. not associated with a session).
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| 54 | */
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| 55 | PJ_DEF(pjsip_tx_data*)
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| 56 | pjsip_messaging_create_msg_from_hdr(pjsip_endpoint *endpt,
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| 57 | const pjsip_uri *target,
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| 58 | const pjsip_from_hdr *param_from,
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| 59 | const pjsip_to_hdr *param_to,
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| 60 | const pjsip_cid_hdr *param_call_id,
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| 61 | int param_cseq,
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| 62 | const pj_str_t *param_text)
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| 63 | {
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| 64 | return pjsip_endpt_create_request_from_hdr( endpt, &message_method,
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| 65 | target,
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| 66 | param_from, param_to,
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| 67 | NULL, param_call_id,
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| 68 | param_cseq, param_text );
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| 69 | }
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| 70 |
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| 71 | /*
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| 72 | * Create independent message from string (instead of from header).
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| 73 | */
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| 74 | PJ_DEF(pjsip_tx_data*)
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| 75 | pjsip_messaging_create_msg( pjsip_endpoint *endpt,
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| 76 | const pj_str_t *target,
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| 77 | const pj_str_t *param_from,
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| 78 | const pj_str_t *param_to,
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| 79 | const pj_str_t *param_call_id,
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| 80 | int param_cseq,
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| 81 | const pj_str_t *param_text)
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| 82 | {
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| 83 | return pjsip_endpt_create_request( endpt, &message_method, target,
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| 84 | param_from, param_to, NULL, param_call_id,
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| 85 | param_cseq, param_text);
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| 86 | }
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| 87 |
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| 88 | /*
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| 89 | * Initiate transaction to send outgoing message.
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| 90 | */
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| 91 | PJ_DEF(pj_status_t)
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| 92 | pjsip_messaging_send_msg( pjsip_endpoint *endpt, pjsip_tx_data *tdata,
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| 93 | void *token, pjsip_messaging_cb cb )
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| 94 | {
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| 95 | pjsip_transaction *tsx;
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| 96 | struct messaging_data *msg_data;
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| 97 |
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| 98 | /* Create transaction. */
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| 99 | tsx = pjsip_endpt_create_tsx(endpt);
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| 100 | if (!tsx) {
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| 101 | pjsip_tx_data_dec_ref(tdata);
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| 102 | return -1;
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| 103 | }
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| 104 |
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| 105 | /* Save parameters to messaging data and attach to tsx. */
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| 106 | msg_data = pj_pool_calloc(tsx->pool, 1, sizeof(struct messaging_data));
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| 107 | msg_data->cb = cb;
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| 108 | msg_data->token = token;
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| 109 |
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| 110 | /* Init transaction. */
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| 111 | tsx->module_data[module_id] = msg_data;
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| 112 | if (pjsip_tsx_init_uac(tsx, tdata) != 0) {
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| 113 | pjsip_tx_data_dec_ref(tdata);
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| 114 | pjsip_endpt_destroy_tsx(endpt, tsx);
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| 115 | return -1;
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| 116 | }
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| 117 |
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| 118 | pjsip_endpt_register_tsx(endpt, tsx);
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| 119 |
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| 120 | /*
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| 121 | * Instruct transaction to send message.
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| 122 | * Further events will be received via transaction's event.
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| 123 | */
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| 124 | pjsip_tsx_on_tx_msg(tsx, tdata);
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| 125 |
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| 126 | /* Decrement reference counter. */
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| 127 | pjsip_tx_data_dec_ref(tdata);
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| 128 | return 0;
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| 129 | }
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| 130 |
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| 131 |
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| 132 | /*
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| 133 | * Create 'IM session'.
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| 134 | */
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| 135 | PJ_DEF(pjsip_messaging_session*)
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| 136 | pjsip_messaging_create_session( pjsip_endpoint *endpt, const pj_str_t *param_from,
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| 137 | const pj_str_t *param_to )
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| 138 | {
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| 139 | pj_pool_t *pool;
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| 140 | pjsip_messaging_session *ses;
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| 141 | pj_str_t tmp, to;
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| 142 |
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| 143 | pool = pjsip_endpt_create_pool(endpt, "imsess", 1024, 1024);
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| 144 | if (!pool)
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| 145 | return NULL;
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| 146 |
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| 147 | ses = pj_pool_calloc(pool, 1, sizeof(pjsip_messaging_session));
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| 148 | ses->pool = pool;
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| 149 | ses->endpt = endpt;
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| 150 |
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| 151 | ses->call_id = pjsip_cid_hdr_create(pool);
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| 152 | pj_create_unique_string(pool, &ses->call_id->id);
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| 153 |
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| 154 | ses->cseq = pjsip_cseq_hdr_create(pool);
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| 155 | ses->cseq->cseq = pj_rand();
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| 156 | ses->cseq->method = message_method;
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| 157 |
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| 158 | ses->from = pjsip_from_hdr_create(pool);
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| 159 | pj_strdup_with_null(pool, &tmp, param_from);
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| 160 | ses->from->uri = pjsip_parse_uri(pool, tmp.ptr, tmp.slen, PJSIP_PARSE_URI_AS_NAMEADDR);
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| 161 | if (ses->from->uri == NULL) {
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| 162 | pjsip_endpt_destroy_pool(endpt, pool);
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| 163 | return NULL;
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| 164 | }
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| 165 | pj_create_unique_string(pool, &ses->from->tag);
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| 166 |
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| 167 | ses->to = pjsip_to_hdr_create(pool);
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| 168 | pj_strdup_with_null(pool, &to, param_from);
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| 169 | ses->to->uri = pjsip_parse_uri(pool, to.ptr, to.slen, PJSIP_PARSE_URI_AS_NAMEADDR);
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| 170 | if (ses->to->uri == NULL) {
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| 171 | pjsip_endpt_destroy_pool(endpt, pool);
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| 172 | return NULL;
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| 173 | }
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| 174 |
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| 175 | PJ_LOG(4,(THIS_FILE, "IM session created: recipient=%s", to.ptr));
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| 176 | return ses;
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| 177 | }
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| 178 |
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| 179 |
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| 180 | /*
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| 181 | * Send IM message using identification from 'IM session'.
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| 182 | */
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| 183 | PJ_DEF(pjsip_tx_data*)
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| 184 | pjsip_messaging_session_create_msg( pjsip_messaging_session *ses, const pj_str_t *text )
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| 185 | {
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| 186 | return pjsip_endpt_create_request_from_hdr( ses->endpt,
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| 187 | &message_method,
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| 188 | ses->to->uri,
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| 189 | ses->from,
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| 190 | ses->to,
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| 191 | NULL,
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| 192 | ses->call_id,
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| 193 | ses->cseq->cseq++,
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| 194 | text);
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| 195 | }
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| 196 |
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| 197 |
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| 198 | /*
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| 199 | * Destroy 'IM session'.
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| 200 | */
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| 201 | PJ_DEF(pj_status_t)
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| 202 | pjsip_messaging_destroy_session( pjsip_messaging_session *ses )
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| 203 | {
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| 204 | /*
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| 205 | * NOTE ABOUT POSSIBLE BUG HERE...
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| 206 | *
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| 207 | * We don't check number of pending transaction before destroying IM
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| 208 | * session. As the result, the headers in the txdata of pending transaction
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| 209 | * wil be INVALID once the IM session is deleted (because we only
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| 210 | * shallo_clone()-ed them).
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| 211 | *
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| 212 | * This normally should be okay, because once the message is
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| 213 | * submitted to transaction, the transaction (or rather the transport)
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| 214 | * will 'print' the message to a buffer, and once it is printed, it
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| 215 | * won't try to access the original message again. So even when the
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| 216 | * original message has a dangling pointer, we should be safe.
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| 217 | *
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| 218 | * However, it will cause a problem if:
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| 219 | * - resolving completes asynchronously and with a substantial delay,
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| 220 | * and before the resolver/transport finished its job the user
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| 221 | * destroy the IM session.
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| 222 | * - if the transmit data is invalidated after the IM session is
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| 223 | * destroyed.
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| 224 | */
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| 225 |
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| 226 | pjsip_endpt_destroy_pool(ses->endpt, ses->pool);
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| 227 | return 0;
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| 228 | }
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| 229 |
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| 230 |
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| 231 | static pj_status_t messaging_init( pjsip_endpoint *endpt,
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| 232 | struct pjsip_module *mod, pj_uint32_t id )
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| 233 | {
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| 234 | PJ_UNUSED_ARG(endpt)
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| 235 | PJ_UNUSED_ARG(mod)
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| 236 |
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| 237 | module_id = id;
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| 238 | return 0;
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| 239 | }
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| 240 |
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| 241 | static pj_status_t messaging_start( struct pjsip_module *mod )
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| 242 | {
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| 243 | PJ_UNUSED_ARG(mod)
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| 244 | return 0;
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| 245 | }
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| 246 |
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| 247 | static pj_status_t messaging_deinit( struct pjsip_module *mod )
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| 248 | {
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| 249 | PJ_UNUSED_ARG(mod)
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| 250 | return 0;
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| 251 | }
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| 252 |
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| 253 | static void messaging_tsx_handler( struct pjsip_module *mod, pjsip_event *event )
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| 254 | {
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| 255 | pjsip_transaction *tsx = event->obj.tsx;
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| 256 | struct messaging_data *mod_data;
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| 257 |
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| 258 | PJ_UNUSED_ARG(mod)
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| 259 |
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| 260 | /* Ignore non transaction event */
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| 261 | if (event->type != PJSIP_EVENT_TSX_STATE_CHANGED || tsx == NULL)
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| 262 | return;
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| 263 |
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| 264 | /* If this is an incoming message, inform application. */
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| 265 | if (tsx->role == PJSIP_ROLE_UAS) {
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| 266 | int status = 100;
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| 267 | pjsip_tx_data *tdata;
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| 268 |
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| 269 | /* Check if we already answered this request. */
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| 270 | if (tsx->status_code >= 200)
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| 271 | return;
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| 272 |
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| 273 | /* Only handle MESSAGE requests!. */
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| 274 | if (pjsip_method_cmp(&tsx->method, &message_method) != 0)
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| 275 | return;
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| 276 |
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| 277 | /* Call application callback. */
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| 278 | if (incoming_cb)
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| 279 | status = (*incoming_cb)(event->src.rdata);
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| 280 |
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| 281 | if (status < 200 || status >= 700)
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| 282 | status = PJSIP_SC_INTERNAL_SERVER_ERROR;
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| 283 |
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| 284 | /* Respond request. */
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| 285 | tdata = pjsip_endpt_create_response(tsx->endpt, event->src.rdata, status );
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| 286 | if (tdata)
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| 287 | pjsip_tsx_on_tx_msg(tsx, tdata);
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| 288 |
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| 289 | return;
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| 290 | }
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| 291 |
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| 292 | /* Ignore if it's not something that came from messaging module. */
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| 293 | mod_data = tsx->module_data[ module_id ];
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| 294 | if (mod_data == NULL)
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| 295 | return;
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| 296 |
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| 297 | /* Ignore non final response. */
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| 298 | if (tsx->status_code < 200)
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| 299 | return;
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| 300 |
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| 301 | /* Don't want to call the callback more than once. */
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| 302 | tsx->module_data[ module_id ] = NULL;
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| 303 |
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| 304 | /* Now call the callback. */
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| 305 | if (mod_data->cb) {
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| 306 | (*mod_data->cb)(mod_data->token, tsx->status_code);
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| 307 | }
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| 308 | }
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| 309 |
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| 310 | static pjsip_module messaging_module =
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| 311 | {
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| 312 | { "Messaging", 9}, /* Name. */
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| 313 | 0, /* Flag */
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| 314 | 128, /* Priority */
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| 315 | NULL, /* User agent instance, initialized by APP. */
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| 316 | 0, /* Number of methods supported (will be initialized later). */
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| 317 | { 0 }, /* Array of methods (will be initialized later) */
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| 318 | &messaging_init, /* init_module() */
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| 319 | &messaging_start, /* start_module() */
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| 320 | &messaging_deinit, /* deinit_module() */
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| 321 | &messaging_tsx_handler, /* tsx_handler() */
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| 322 | };
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| 323 |
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| 324 | PJ_DEF(pjsip_module*) pjsip_messaging_get_module()
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| 325 | {
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| 326 | static pj_str_t method_str = { "MESSAGE", 7 };
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| 327 |
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| 328 | pjsip_method_init_np( &message_method, &method_str);
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| 329 |
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| 330 | messaging_module.method_cnt = 1;
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| 331 | messaging_module.methods[0] = &message_method;
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| 332 |
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| 333 | return &messaging_module;
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| 334 | }
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| 335 |
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