254 lines
7.4 KiB
C
254 lines
7.4 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2013, Digium, Inc.
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*
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* Mark Michelson <mmichelson@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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#include "asterisk.h"
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#include <pjsip.h>
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#include "asterisk/res_sip.h"
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static int distribute(void *data);
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static pj_bool_t distributor(pjsip_rx_data *rdata);
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static pjsip_module distributor_mod = {
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.name = {"Request Distributor", 19},
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.priority = PJSIP_MOD_PRIORITY_TSX_LAYER - 6,
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.on_rx_request = distributor,
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.on_rx_response = distributor,
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};
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/*! Dialog-specific information the distributor uses */
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struct distributor_dialog_data {
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/* Serializer to distribute tasks to for this dialog */
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struct ast_taskprocessor *serializer;
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/* Endpoint associated with this dialog */
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struct ast_sip_endpoint *endpoint;
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};
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/*!
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* \internal
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*
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* \note Call this with the dialog locked
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*/
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static struct distributor_dialog_data *distributor_dialog_data_alloc(pjsip_dialog *dlg)
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{
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struct distributor_dialog_data *dist;
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dist = PJ_POOL_ZALLOC_T(dlg->pool, struct distributor_dialog_data);
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pjsip_dlg_set_mod_data(dlg, distributor_mod.id, dist);
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return dist;
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}
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void ast_sip_dialog_set_serializer(pjsip_dialog *dlg, struct ast_taskprocessor *serializer)
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{
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struct distributor_dialog_data *dist;
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SCOPED_LOCK(lock, dlg, pjsip_dlg_inc_lock, pjsip_dlg_dec_lock);
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dist = pjsip_dlg_get_mod_data(dlg, distributor_mod.id);
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if (!dist) {
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dist = distributor_dialog_data_alloc(dlg);
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}
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dist->serializer = serializer;
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}
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void ast_sip_dialog_set_endpoint(pjsip_dialog *dlg, struct ast_sip_endpoint *endpoint)
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{
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struct distributor_dialog_data *dist;
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SCOPED_LOCK(lock, dlg, pjsip_dlg_inc_lock, pjsip_dlg_dec_lock);
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dist = pjsip_dlg_get_mod_data(dlg, distributor_mod.id);
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if (!dist) {
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dist = distributor_dialog_data_alloc(dlg);
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}
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dist->endpoint = endpoint;
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}
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struct ast_sip_endpoint *ast_sip_dialog_get_endpoint(pjsip_dialog *dlg)
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{
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struct distributor_dialog_data *dist;
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SCOPED_LOCK(lock, dlg, pjsip_dlg_inc_lock, pjsip_dlg_dec_lock);
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dist = pjsip_dlg_get_mod_data(dlg, distributor_mod.id);
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if (!dist || !dist->endpoint) {
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return NULL;
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}
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ao2_ref(dist->endpoint, +1);
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return dist->endpoint;
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}
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static pj_bool_t distributor(pjsip_rx_data *rdata)
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{
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pjsip_dialog *dlg = pjsip_ua_find_dialog(&rdata->msg_info.cid->id, &rdata->msg_info.to->tag, &rdata->msg_info.from->tag, PJ_TRUE);
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struct distributor_dialog_data *dist = NULL;
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struct ast_taskprocessor *serializer = NULL;
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pjsip_rx_data *clone;
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pjsip_rx_data_clone(rdata, 0, &clone);
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if (dlg) {
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dist = pjsip_dlg_get_mod_data(dlg, distributor_mod.id);
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if (dist) {
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serializer = dist->serializer;
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clone->endpt_info.mod_data[distributor_mod.id] = dist->endpoint;
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}
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}
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ast_sip_push_task(serializer, distribute, clone);
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if (dlg) {
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pjsip_dlg_dec_lock(dlg);
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}
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return PJ_TRUE;
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}
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static pj_bool_t endpoint_lookup(pjsip_rx_data *rdata);
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static pjsip_module endpoint_mod = {
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.name = {"Endpoint Identifier", 19},
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.priority = PJSIP_MOD_PRIORITY_TSX_LAYER - 3,
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.on_rx_request = endpoint_lookup,
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};
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static pj_bool_t endpoint_lookup(pjsip_rx_data *rdata)
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{
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struct ast_sip_endpoint *endpoint;
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int is_ack = rdata->msg_info.msg->line.req.method.id == PJSIP_ACK_METHOD;
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endpoint = rdata->endpt_info.mod_data[distributor_mod.id];
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if (endpoint) {
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/* Bumping the refcount makes refcounting consistent whether an endpoint
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* is looked up or not */
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ao2_ref(endpoint, +1);
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} else {
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endpoint = ast_sip_identify_endpoint(rdata);
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}
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if (!endpoint && !is_ack) {
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char name[AST_UUID_STR_LEN] = "";
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pjsip_uri *from = rdata->msg_info.from->uri;
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/* XXX When we do an alwaysauthreject-like option, we'll need to take that into account
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* for this response. Either that, or have a pseudo-endpoint to pass along so that authentication
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* will fail
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*/
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pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 403, NULL, NULL, NULL);
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if (PJSIP_URI_SCHEME_IS_SIP(from) || PJSIP_URI_SCHEME_IS_SIPS(from)) {
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pjsip_sip_uri *sip_from = pjsip_uri_get_uri(from);
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ast_copy_pj_str(name, &sip_from->user, sizeof(name));
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}
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ast_sip_report_invalid_endpoint(name, rdata);
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return PJ_TRUE;
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}
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rdata->endpt_info.mod_data[endpoint_mod.id] = endpoint;
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return PJ_FALSE;
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}
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static pj_bool_t authenticate(pjsip_rx_data *rdata)
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{
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RAII_VAR(struct ast_sip_endpoint *, endpoint, ast_pjsip_rdata_get_endpoint(rdata), ao2_cleanup);
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int is_ack = rdata->msg_info.msg->line.req.method.id == PJSIP_ACK_METHOD;
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ast_assert(endpoint != NULL);
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if (!is_ack && ast_sip_requires_authentication(endpoint, rdata)) {
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pjsip_tx_data *tdata;
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pjsip_endpt_create_response(ast_sip_get_pjsip_endpoint(), rdata, 401, NULL, &tdata);
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switch (ast_sip_check_authentication(endpoint, rdata, tdata)) {
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case AST_SIP_AUTHENTICATION_CHALLENGE:
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/* Send the 401 we created for them */
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ast_sip_report_auth_challenge_sent(endpoint, rdata, tdata);
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pjsip_endpt_send_response2(ast_sip_get_pjsip_endpoint(), rdata, tdata, NULL, NULL);
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return PJ_TRUE;
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case AST_SIP_AUTHENTICATION_SUCCESS:
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ast_sip_report_auth_success(endpoint, rdata);
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pjsip_tx_data_dec_ref(tdata);
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return PJ_FALSE;
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case AST_SIP_AUTHENTICATION_FAILED:
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ast_sip_report_auth_failed_challenge_response(endpoint, rdata);
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pjsip_tx_data_dec_ref(tdata);
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pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 403, NULL, NULL, NULL);
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return PJ_TRUE;
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case AST_SIP_AUTHENTICATION_ERROR:
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ast_sip_report_auth_failed_challenge_response(endpoint, rdata);
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pjsip_tx_data_dec_ref(tdata);
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pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 500, NULL, NULL, NULL);
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return PJ_TRUE;
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}
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}
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return PJ_FALSE;
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}
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static pjsip_module auth_mod = {
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.name = {"Request Authenticator", 21},
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.priority = PJSIP_MOD_PRIORITY_APPLICATION - 1,
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.on_rx_request = authenticate,
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};
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static int distribute(void *data)
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{
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static pjsip_process_rdata_param param = {
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.start_mod = &distributor_mod,
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.idx_after_start = 1,
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};
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pj_bool_t handled;
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pjsip_rx_data *rdata = data;
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int is_request = rdata->msg_info.msg->type == PJSIP_REQUEST_MSG;
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int is_ack = is_request ? rdata->msg_info.msg->line.req.method.id == PJSIP_ACK_METHOD : 0;
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struct ast_sip_endpoint *endpoint;
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pjsip_endpt_process_rx_data(ast_sip_get_pjsip_endpoint(), rdata, ¶m, &handled);
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if (!handled && is_request && !is_ack) {
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pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 501, NULL, NULL, NULL);
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}
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/* The endpoint_mod stores an endpoint reference in the mod_data of rdata. This
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* is the only appropriate spot to actually decrement the reference.
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*/
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endpoint = rdata->endpt_info.mod_data[endpoint_mod.id];
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ao2_cleanup(endpoint);
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pjsip_rx_data_free_cloned(rdata);
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return 0;
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}
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struct ast_sip_endpoint *ast_pjsip_rdata_get_endpoint(pjsip_rx_data *rdata)
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{
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struct ast_sip_endpoint *endpoint = rdata->endpt_info.mod_data[endpoint_mod.id];
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if (endpoint) {
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ao2_ref(endpoint, +1);
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}
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return endpoint;
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}
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int ast_sip_initialize_distributor(void)
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{
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if (ast_sip_register_service(&distributor_mod)) {
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return -1;
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}
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if (ast_sip_register_service(&endpoint_mod)) {
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return -1;
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}
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if (ast_sip_register_service(&auth_mod)) {
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return -1;
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}
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return 0;
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}
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