2013-06-22 14:03:22 +00:00
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/*
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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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* Kevin Harwell <kharwell@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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/*** MODULEINFO
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<depend>pjproject</depend>
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2013-07-30 18:14:50 +00:00
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<depend>res_pjsip</depend>
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<depend>res_pjsip_session</depend>
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2013-06-22 14:03:22 +00:00
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include <pjsip.h>
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#include <pjsip_ua.h>
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2013-07-30 18:14:50 +00:00
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#include "asterisk/res_pjsip.h"
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#include "asterisk/res_pjsip_session.h"
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2013-06-22 14:03:22 +00:00
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#include "asterisk/callerid.h"
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#include "asterisk/channel.h"
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#include "asterisk/module.h"
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#include "asterisk/strings.h"
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static const pj_str_t diversion_name = { "Diversion", 9 };
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/*! \brief Diversion header reasons
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*
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* The core defines a bunch of constants used to define
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* redirecting reasons. This provides a translation table
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* between those and the strings which may be present in
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* a SIP Diversion header
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*/
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static const struct reasons {
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enum AST_REDIRECTING_REASON code;
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char *const text;
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} reason_table[] = {
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{ AST_REDIRECTING_REASON_UNKNOWN, "unknown" },
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{ AST_REDIRECTING_REASON_USER_BUSY, "user-busy" },
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{ AST_REDIRECTING_REASON_NO_ANSWER, "no-answer" },
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{ AST_REDIRECTING_REASON_UNAVAILABLE, "unavailable" },
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{ AST_REDIRECTING_REASON_UNCONDITIONAL, "unconditional" },
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{ AST_REDIRECTING_REASON_TIME_OF_DAY, "time-of-day" },
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{ AST_REDIRECTING_REASON_DO_NOT_DISTURB, "do-not-disturb" },
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{ AST_REDIRECTING_REASON_DEFLECTION, "deflection" },
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{ AST_REDIRECTING_REASON_FOLLOW_ME, "follow-me" },
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{ AST_REDIRECTING_REASON_OUT_OF_ORDER, "out-of-service" },
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{ AST_REDIRECTING_REASON_AWAY, "away" },
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{ AST_REDIRECTING_REASON_CALL_FWD_DTE, "unknown"},
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{ AST_REDIRECTING_REASON_SEND_TO_VM, "send_to_vm"},
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};
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static const char *reason_code_to_str(const struct ast_party_redirecting_reason *reason)
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{
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int code = reason->code;
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/* use specific string if given */
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if (!ast_strlen_zero(reason->str)) {
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return reason->str;
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}
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if (code >= 0 && code < ARRAY_LEN(reason_table)) {
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return reason_table[code].text;
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}
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return "unknown";
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}
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static enum AST_REDIRECTING_REASON reason_str_to_code(const char *text)
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{
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enum AST_REDIRECTING_REASON code = AST_REDIRECTING_REASON_UNKNOWN;
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int i;
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for (i = 0; i < ARRAY_LEN(reason_table); ++i) {
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if (!strcasecmp(text, reason_table[i].text)) {
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code = reason_table[i].code;
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break;
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}
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}
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return code;
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}
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static pjsip_fromto_hdr *get_diversion_header(pjsip_rx_data *rdata)
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{
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static const pj_str_t from_name = { "From", 4 };
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pjsip_generic_string_hdr *hdr;
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pj_str_t value;
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int size;
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if (!(hdr = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &diversion_name, NULL))) {
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return NULL;
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}
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pj_strdup_with_null(rdata->tp_info.pool, &value, &hdr->hvalue);
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/* parse as a fromto header */
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return pjsip_parse_hdr(rdata->tp_info.pool, &from_name, value.ptr,
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pj_strlen(&value), &size);
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}
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static void set_redirecting_value(char **dst, const pj_str_t *src)
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{
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ast_free(*dst);
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*dst = ast_malloc(pj_strlen(src) + 1);
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ast_copy_pj_str(*dst, src, pj_strlen(src) + 1);
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}
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static void set_redirecting_id(pjsip_name_addr *name_addr, struct ast_party_id *data,
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struct ast_set_party_id *update)
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{
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pjsip_sip_uri *uri = pjsip_uri_get_uri(name_addr->uri);
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if (pj_strlen(&uri->user)) {
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update->number = 1;
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data->number.valid = 1;
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set_redirecting_value(&data->number.str, &uri->user);
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}
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if (pj_strlen(&name_addr->display)) {
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update->name = 1;
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data->name.valid = 1;
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set_redirecting_value(&data->name.str, &name_addr->display);
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}
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}
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static void copy_redirecting_id(struct ast_party_id *dst, const struct ast_party_id *src,
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struct ast_set_party_id *update)
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{
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ast_party_id_copy(dst, src);
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if (dst->number.valid) {
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update->number = 1;
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}
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if (dst->name.valid) {
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update->name = 1;
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}
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}
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static void set_redirecting_reason(pjsip_fromto_hdr *hdr,
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struct ast_party_redirecting_reason *data)
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{
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static const pj_str_t reason_name = { "reason", 6 };
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pjsip_param *reason = pjsip_param_find(&hdr->other_param, &reason_name);
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if (!reason) {
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return;
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}
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set_redirecting_value(&data->str, &reason->value);
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data->code = reason_str_to_code(data->str);
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}
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static void set_redirecting(struct ast_sip_session *session,
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pjsip_fromto_hdr *from_info,
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pjsip_name_addr *to_info)
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{
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struct ast_party_redirecting data;
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struct ast_set_party_redirecting update;
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if (!session->channel) {
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return;
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}
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ast_party_redirecting_init(&data);
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memset(&update, 0, sizeof(update));
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if (from_info) {
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set_redirecting_id((pjsip_name_addr*)from_info->uri,
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&data.from, &update.from);
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set_redirecting_reason(from_info, &data.reason);
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} else {
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copy_redirecting_id(&data.from, &session->id, &update.from);
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}
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set_redirecting_id(to_info, &data.to, &update.to);
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ast_set_party_id_all(&update.priv_orig);
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ast_set_party_id_all(&update.priv_from);
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ast_set_party_id_all(&update.priv_to);
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++data.count;
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ast_channel_set_redirecting(session->channel, &data, &update);
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ast_party_redirecting_free(&data);
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}
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static int diversion_incoming_request(struct ast_sip_session *session, pjsip_rx_data *rdata)
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{
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pjsip_fromto_hdr *hdr = get_diversion_header(rdata);
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if (hdr) {
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set_redirecting(session, hdr, (pjsip_name_addr*)
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PJSIP_MSG_TO_HDR(rdata->msg_info.msg)->uri);
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}
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return 0;
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}
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static void diversion_incoming_response(struct ast_sip_session *session, pjsip_rx_data *rdata)
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{
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static const pj_str_t contact_name = { "Contact", 7 };
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pjsip_status_line status = rdata->msg_info.msg->line.status;
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pjsip_fromto_hdr *div_hdr;
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pjsip_contact_hdr *contact_hdr;
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if ((status.code != 302) && (status.code != 181)) {
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return;
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}
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/* use the diversion header info if there is one. if not one then use the
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session caller id info. if that doesn't exist use info from the To hdr*/
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if (!(div_hdr = get_diversion_header(rdata)) && !session->id.number.valid) {
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div_hdr = PJSIP_MSG_TO_HDR(rdata->msg_info.msg);
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}
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contact_hdr = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &contact_name, NULL);
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set_redirecting(session, div_hdr, contact_hdr ? (pjsip_name_addr*)contact_hdr->uri :
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(pjsip_name_addr*)PJSIP_MSG_FROM_HDR(rdata->msg_info.msg)->uri);
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}
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/*!
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* \internal
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* \brief Adds diversion header information to an outbound SIP message
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*
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* \param tdata The outbound message
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* \param data The redirecting data used to fill parts of the diversion header
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*/
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static void add_diversion_header(pjsip_tx_data *tdata, struct ast_party_redirecting *data)
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{
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pjsip_fromto_hdr *hdr;
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pjsip_name_addr *name_addr;
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pjsip_sip_uri *uri;
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pjsip_param *param;
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struct ast_party_id *id = &data->from;
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pjsip_uri *base = PJSIP_MSG_FROM_HDR(tdata->msg)->uri;
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if (!id->number.valid || ast_strlen_zero(id->number.str)) {
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return;
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}
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hdr = pjsip_from_hdr_create(tdata->pool);
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hdr->type = PJSIP_H_OTHER;
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pj_strdup(tdata->pool, &hdr->name, &diversion_name);
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hdr->sname.slen = 0;
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name_addr = pjsip_uri_clone(tdata->pool, base);
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uri = pjsip_uri_get_uri(name_addr->uri);
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pj_strdup2(tdata->pool, &name_addr->display, id->name.str);
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pj_strdup2(tdata->pool, &uri->user, id->number.str);
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param = PJ_POOL_ALLOC_T(tdata->pool, pjsip_param);
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param->name = pj_str("reason");
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param->value = pj_str((char*)reason_code_to_str(&data->reason));
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pj_list_insert_before(&hdr->other_param, param);
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hdr->uri = (pjsip_uri *) name_addr;
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pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr *)hdr);
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}
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static void get_redirecting_add_diversion(struct ast_sip_session *session, pjsip_tx_data *tdata)
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{
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struct ast_party_redirecting *data;
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2013-07-30 15:17:56 +00:00
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if (session->channel && session->endpoint->id.send_diversion &&
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2013-06-22 14:03:22 +00:00
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(data = ast_channel_redirecting(session->channel))->count) {
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add_diversion_header(tdata, data);
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}
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}
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/*!
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* \internal
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* \brief Adds a diversion header to an outgoing INVITE request if
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* redirecting information is available.
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*
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* \param session The session on which the INVITE request is to be sent
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* \param tdata The outbound INVITE request
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*/
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static void diversion_outgoing_request(struct ast_sip_session *session, pjsip_tx_data *tdata)
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{
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get_redirecting_add_diversion(session, tdata);
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}
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/*!
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* \internal
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* \brief Adds a diversion header to an outgoing 3XX response
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*
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* \param session The session on which the INVITE response is to be sent
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* \param tdata The outbound INVITE response
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*/
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static void diversion_outgoing_response(struct ast_sip_session *session, pjsip_tx_data *tdata)
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{
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struct pjsip_status_line status = tdata->msg->line.status;
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/* add to 302 and 181 */
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if (PJSIP_IS_STATUS_IN_CLASS(status.code, 300) || (status.code == 181)) {
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get_redirecting_add_diversion(session, tdata);
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}
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}
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static struct ast_sip_session_supplement diversion_supplement = {
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.method = "INVITE",
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/* this supplement needs to be called after caller id
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and after the channel has been created */
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.priority = AST_SIP_SESSION_SUPPLEMENT_PRIORITY_CHANNEL + 100,
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.incoming_request = diversion_incoming_request,
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.incoming_response = diversion_incoming_response,
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.outgoing_request = diversion_outgoing_request,
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.outgoing_response = diversion_outgoing_response,
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};
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static int load_module(void)
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{
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ast_sip_session_register_supplement(&diversion_supplement);
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return AST_MODULE_LOAD_SUCCESS;
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}
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static int unload_module(void)
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{
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ast_sip_session_unregister_supplement(&diversion_supplement);
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return 0;
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}
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2013-07-30 18:14:50 +00:00
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Add Diversion Header Support",
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_APP_DEPEND,
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);
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