/*
 * $Id$
 *
 * Copyright (C) 2012 Smile Communications, jason.penton@smilecoms.com
 * Copyright (C) 2012 Smile Communications, richard.good@smilecoms.com
 *
 * The initial version of this code was written by Dragos Vingarzan
 * (dragos(dot)vingarzan(at)fokus(dot)fraunhofer(dot)de and the
 * Fraunhofer FOKUS Institute. It was and still is maintained in a separate
 * branch of the original SER. We are therefore migrating it to
 * Kamailio/SR and look forward to maintaining it from here on out.
 * 2011/2012 Smile Communications, Pty. Ltd.
 * ported/maintained/improved by
 * Jason Penton (jason(dot)penton(at)smilecoms.com and
 * Richard Good (richard(dot)good(at)smilecoms.com) as part of an
 * effort to add full IMS support to Kamailio/SR using a new and
 * improved architecture
 *
 * NB: A lot of this code was originally part of OpenIMSCore,
 * FhG Fokus.
 * Copyright (C) 2004-2006 FhG Fokus
 * Thanks for great work! This is an effort to
 * break apart the various CSCF functions into logically separate
 * components. We hope this will drive wider use. We also feel
 * that in this way the architecture is more complete and thereby easier
 * to manage in the Kamailio/SR environment
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * Kamailio 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
 *
 * Kamailio 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *
 *
 * History:
 * --------
 *  2011-02-02  initial version (jason.penton)
 */

#include "../../core/sr_module.h"
#include "../../core/ut.h"
#include "../../core/mem/shm_mem.h"
#include "../../core/parser/contact/parse_contact.h"
#include "../../core/locking.h"
#include "../tm/tm_load.h"
#include "../ims_usrloc_pcscf/usrloc.h"

#include "../../core/parser/sdp/sdp_helpr_funcs.h"
#include "../../core/parser/sdp/sdp.h"
#include "../../core/parser/parse_rr.h"
#include "../cdp/cdp_load.h"
#include "rx_authdata.h"
#include "rx_avp.h"
#include "../../lib/ims/ims_getters.h"
#include "ims_qos_mod.h"

int create_new_regsessiondata(str *domain, str *aor, str *ip, int ip_version,
		int recv_port, unsigned short recv_proto, str *via_host,
		unsigned short via_port, unsigned short via_proto,
		rx_authsessiondata_t **session_data)
{

	int len = (domain->len + 1) + ip->len + aor->len + via_host->len
			  + sizeof(rx_authsessiondata_t);
	rx_authsessiondata_t *p_session_data = shm_malloc(len);
	if(!p_session_data) {
		LM_ERR("no more shm memory\n");
		return -1;
	}
	memset(p_session_data, 0, len);

	p_session_data->subscribed_to_signaling_path_status = 1;
	p_session_data->must_terminate_dialog =
			0; /*irrelevent for reg session data this will always be 0 */

	p_session_data->session_has_been_opened =
			0; /*0 has not been opened 1 has been opened*/
	p_session_data->ip_version = ip_version;
	p_session_data->via_port = via_port;
	p_session_data->via_proto = via_proto;

	p_session_data->recv_port = recv_port;
	p_session_data->recv_proto = recv_proto;

	char *p = (char *)(p_session_data + 1);
	p_session_data->domain.s = p;
	memcpy(p, domain->s, domain->len);
	p_session_data->domain.len = domain->len;
	p += domain->len;
	*p++ = '\0';

	p_session_data->registration_aor.s = p;
	memcpy(p, aor->s, aor->len);
	p_session_data->registration_aor.len = aor->len;
	p += aor->len;

	p_session_data->ip.s = p;
	memcpy(p, ip->s, ip->len);
	p_session_data->ip.len = ip->len;
	p += ip->len;

	p_session_data->via_host.s = p;
	memcpy(p, via_host->s, via_host->len);
	p_session_data->via_host.len = via_host->len;
	p += via_host->len;

	if(p != (((char *)p_session_data) + len)) {
		LM_ERR("buffer over/underflow\n");
		shm_free(p_session_data);
		p_session_data = 0;
		return -1;
	}

	p_session_data->direction = DLG_MOBILE_REGISTER;

	*session_data = p_session_data;

	return 1;
}

int create_new_callsessiondata(str *callid, str *ftag, str *ttag,
		str *identifier, int identifier_type, str *ip, int ip_version,
		enum dialog_direction direction, rx_authsessiondata_t **session_data)
{

	int len = callid->len + ftag->len + ttag->len + identifier->len + ip->len
			  + sizeof(rx_authsessiondata_t);
	rx_authsessiondata_t *call_session_data = shm_malloc(len);
	if(!call_session_data) {
		LM_ERR("no more shm mem trying to create call_session_data of size "
			   "%d\n",
				len);
		return -1;
	}
	memset(call_session_data, 0, len);
	call_session_data->subscribed_to_signaling_path_status =
			0; //this is for a media session not registration
	call_session_data->must_terminate_dialog =
			0; //this is used to determine if the dialog must be torn down when the CDP session terminates

	call_session_data->first_current_flow_description = 0;
	call_session_data->first_new_flow_description = 0;
	call_session_data->ip_version = ip_version;
	call_session_data->identifier_type = identifier_type;

	call_session_data->session_has_been_opened =
			0; /*0 has not been opened 1 has been opened*/

	char *p = (char *)(call_session_data + 1);

	if(callid && callid->len > 0 && callid->s) {
		LM_DBG("Copying callid [%.*s] into call session data\n", callid->len,
				callid->s);
		call_session_data->callid.s = p;
		memcpy(call_session_data->callid.s, callid->s, callid->len);
		call_session_data->callid.len = callid->len;
		p += callid->len;
	}
	if(ftag && ftag->len > 0 && ftag->s) {
		LM_DBG("Copying ftag [%.*s] into call session data\n", ftag->len,
				ftag->s);
		call_session_data->ftag.s = p;
		memcpy(call_session_data->ftag.s, ftag->s, ftag->len);
		call_session_data->ftag.len = ftag->len;
		p += ftag->len;
	}
	if(ttag && ttag->len > 0 && ttag->s) {
		LM_DBG("Copying ttag [%.*s] into call session data\n", ttag->len,
				ttag->s);
		call_session_data->ttag.s = p;
		memcpy(call_session_data->ttag.s, ttag->s, ttag->len);
		call_session_data->ttag.len = ttag->len;
		p += ttag->len;
	}
	if(identifier && identifier->len > 0 && identifier->s) {
		LM_DBG("Copying identifier [%.*s] into call session data\n",
				identifier->len, identifier->s);
		call_session_data->identifier.s = p;
		memcpy(call_session_data->identifier.s, identifier->s, identifier->len);
		call_session_data->identifier.len = identifier->len;
		p += identifier->len;
	}
	if(ip && ip->len > 0 && ip->s) {
		LM_DBG("Copying ip [%.*s] into call session data\n", ip->len, ip->s);
		call_session_data->ip.s = p;
		memcpy(call_session_data->ip.s, ip->s, ip->len);
		call_session_data->ip.len = ip->len;
		p += ip->len;
	}
	if(p != ((char *)(call_session_data) + len)) {
		LM_ERR("buffer under/overflow\n");
		shm_free(call_session_data);
		return -1;
	}

	call_session_data->direction = direction;

	*session_data = call_session_data;
	return 1;
}

/* Param current tells us if this a current fd or a new fd to add*/
int add_flow_description(rx_authsessiondata_t *session_data, int stream_num,
		str *media, str *req_sdp_ip_addr, str *req_sdp_port,
		str *rpl_sdp_ip_addr, str *rpl_sdp_port, str *rpl_sdp_transport,
		str *req_sdp_raw_stream, str *rpl_sdp_raw_stream, int direction,
		int current)
{

	flow_description_t *fd = 0;
	flow_description_t *tmp, *tmp1 = 0;

	int len = media->len + req_sdp_ip_addr->len + req_sdp_port->len
			  + rpl_sdp_ip_addr->len + rpl_sdp_port->len
			  + rpl_sdp_transport->len + req_sdp_raw_stream->len
			  + rpl_sdp_raw_stream->len + sizeof(flow_description_t);
	fd = shm_malloc(len);
	if(!fd) {
		LM_ERR("no more shm mem trying to create new flow description of size "
			   "%d\n",
				len);
		return -1;
	}
	memset(fd, 0, len);

	fd->direction = direction;
	fd->stream_num = stream_num;

	char *p = (char *)(fd + 1);

	if(media && media->len > 0 && media->s) {
		LM_DBG("Copying media [%.*s] into flow description\n", media->len,
				media->s);
		fd->media.s = p;
		memcpy(fd->media.s, media->s, media->len);
		fd->media.len = media->len;
		p += media->len;
	}
	if(req_sdp_ip_addr && req_sdp_ip_addr->len > 0 && req_sdp_ip_addr->s) {
		LM_DBG("Copying req_sdp_ip_addr [%.*s] into flow description\n",
				req_sdp_ip_addr->len, req_sdp_ip_addr->s);
		fd->req_sdp_ip_addr.s = p;
		memcpy(fd->req_sdp_ip_addr.s, req_sdp_ip_addr->s, req_sdp_ip_addr->len);
		fd->req_sdp_ip_addr.len = req_sdp_ip_addr->len;
		p += req_sdp_ip_addr->len;
	}
	if(req_sdp_port && req_sdp_port->len > 0 && req_sdp_port->s) {
		LM_DBG("Copying req_sdp_port [%.*s] into flow description\n",
				req_sdp_port->len, req_sdp_port->s);
		fd->req_sdp_port.s = p;
		memcpy(fd->req_sdp_port.s, req_sdp_port->s, req_sdp_port->len);
		fd->req_sdp_port.len = req_sdp_port->len;
		p += req_sdp_port->len;
	}
	if(rpl_sdp_ip_addr && rpl_sdp_ip_addr->len > 0 && rpl_sdp_ip_addr->s) {
		LM_DBG("Copying rpl_sdp_ip_addr [%.*s] into flow description\n",
				rpl_sdp_ip_addr->len, rpl_sdp_ip_addr->s);
		fd->rpl_sdp_ip_addr.s = p;
		memcpy(fd->rpl_sdp_ip_addr.s, rpl_sdp_ip_addr->s, rpl_sdp_ip_addr->len);
		fd->rpl_sdp_ip_addr.len = rpl_sdp_ip_addr->len;
		p += rpl_sdp_ip_addr->len;
	}
	if(rpl_sdp_port && rpl_sdp_port->len > 0 && rpl_sdp_port->s) {
		LM_DBG("Copying rpl_sdp_port [%.*s] into flow description\n",
				rpl_sdp_port->len, rpl_sdp_port->s);
		fd->rpl_sdp_port.s = p;
		memcpy(fd->rpl_sdp_port.s, rpl_sdp_port->s, rpl_sdp_port->len);
		fd->rpl_sdp_port.len = rpl_sdp_port->len;
		p += rpl_sdp_port->len;
	}
	if(rpl_sdp_transport && rpl_sdp_transport->len > 0
			&& rpl_sdp_transport->s) {
		LM_DBG("Copying rpl_sdp_transport [%.*s] into flow description\n",
				rpl_sdp_transport->len, rpl_sdp_transport->s);
		fd->rpl_sdp_transport.s = p;
		memcpy(fd->rpl_sdp_transport.s, rpl_sdp_transport->s,
				rpl_sdp_transport->len);
		fd->rpl_sdp_transport.len = rpl_sdp_transport->len;
		p += rpl_sdp_transport->len;
	}
	if(req_sdp_raw_stream && req_sdp_raw_stream->len > 0
			&& req_sdp_raw_stream->s) {
		LM_DBG("Copying req_sdp_raw_stream [%.*s] into flow description\n",
				req_sdp_raw_stream->len, req_sdp_raw_stream->s);
		fd->req_sdp_raw_stream.s = p;
		memcpy(fd->req_sdp_raw_stream.s, req_sdp_raw_stream->s,
				req_sdp_raw_stream->len);
		fd->req_sdp_raw_stream.len = req_sdp_raw_stream->len;
		p += req_sdp_raw_stream->len;
	}
	if(rpl_sdp_raw_stream && rpl_sdp_raw_stream->len > 0
			&& rpl_sdp_raw_stream->s) {
		LM_DBG("Copying rpl_sdp_raw_stream [%.*s] into flow description\n",
				rpl_sdp_raw_stream->len, rpl_sdp_raw_stream->s);
		fd->rpl_sdp_raw_stream.s = p;
		memcpy(fd->rpl_sdp_raw_stream.s, rpl_sdp_raw_stream->s,
				rpl_sdp_raw_stream->len);
		fd->rpl_sdp_raw_stream.len = rpl_sdp_raw_stream->len;
		p += rpl_sdp_raw_stream->len;
	}

	if(p != ((char *)(fd) + len)) {
		LM_ERR("buffer under/overflow\n");
		shm_free(fd);
		return -1;
	}

	fd->next = 0;

	if(current) {
		LM_DBG("Adding current flow description\n");
		if(session_data->first_current_flow_description == 0) {
			LM_DBG("This is the first\n");
			session_data->first_current_flow_description = fd;
		} else {
			LM_DBG("This is NOT the first - adding to the list\n");
			tmp = session_data->first_current_flow_description;
			while(tmp) {
				tmp1 = tmp->next;
				if(!tmp1) {
					break;
				}
				tmp = tmp1;
			}
			tmp->next = fd;
		}
	} else {
		LM_DBG("Adding new flow description\n");
		if(session_data->first_new_flow_description == 0) {
			LM_DBG("This is the first\n");
			session_data->first_new_flow_description = fd;
		} else {
			LM_DBG("This is NOT the first - adding to the list\n");
			tmp = session_data->first_new_flow_description;
			//scrolls to last valid entry
			while(tmp) {
				tmp1 = tmp->next;
				if(!tmp1) {
					break;
				}
				tmp = tmp1;
			}
			tmp->next = fd;
		}
	}

	return 1;
}

/* Param current tells us if this a current fd or a new fd to add*/
void free_flow_description(rx_authsessiondata_t *session_data, int current)
{

	flow_description_t *flow_description;
	flow_description_t *flow_description_tmp;
	if(!session_data) {
		return;
	}

	if(current) {
		LM_DBG("Destroy current flow description\n");
		flow_description = session_data->first_current_flow_description;
		if(!flow_description) {
			return;
		}
	} else {
		LM_DBG("Destroy new flow description\n");
		flow_description = session_data->first_new_flow_description;
		if(!flow_description) {
			return;
		}
	}

	while(flow_description) {
		flow_description_tmp = flow_description->next;
		shm_free(flow_description);
		flow_description = 0;
		flow_description = flow_description_tmp;
	}
}

void free_callsessiondata(rx_authsessiondata_t *session_data)
{

	if(!session_data) {
		return;
	}
	LM_DBG("Freeing session data for [%.*s]\n", session_data->via_host.len,
			session_data->via_host.s);
	LM_DBG("Destroy current flow description\n");
	free_flow_description(session_data, 1);

	LM_DBG("Destroy new flow description\n");
	free_flow_description(session_data, 0);

	LM_DBG("Destroy session data\n");
	shm_free(session_data);
	session_data = 0;
}

void show_callsessiondata(rx_authsessiondata_t *session_data)
{

	flow_description_t *flow_description;

	if(!session_data) {
		return;
	}

	LM_DBG("Session data:\n");
	LM_DBG("=====================\n");
	LM_DBG("Call id [%.*s]\n", session_data->callid.len,
			session_data->callid.s);
	LM_DBG("Domain [%.*s]\n", session_data->domain.len, session_data->domain.s);
	LM_DBG("Ftag [%.*s]\n", session_data->ftag.len, session_data->ftag.s);
	LM_DBG("Ttag [%.*s]\n", session_data->ttag.len, session_data->ttag.s);
	LM_DBG("Identifier [%.*s]\n", session_data->identifier.len,
			session_data->identifier.s);
	LM_DBG("Registration AOR [%.*s]\n", session_data->registration_aor.len,
			session_data->registration_aor.s);
	LM_DBG("IP [%.*s]\n", session_data->ip.len, session_data->ip.s);
	LM_DBG("IP version [%d]\n", session_data->ip_version);
	LM_DBG("Must terminate dialog [%d]\n", session_data->must_terminate_dialog);
	LM_DBG("Subscribed to signalling path status [%d]\n",
			session_data->subscribed_to_signaling_path_status);

	flow_description = session_data->first_current_flow_description;
	while(flow_description) {
		LM_DBG("Current Flow description [%d]\n", flow_description->stream_num);
		LM_DBG("\tMedia [%.*s]\n", flow_description->media.len,
				flow_description->media.s);
		LM_DBG("\tReq_sdp_ip_addr [%.*s]\n",
				flow_description->req_sdp_ip_addr.len,
				flow_description->req_sdp_ip_addr.s);
		LM_DBG("\tReq_sdp_port [%.*s]\n", flow_description->req_sdp_port.len,
				flow_description->req_sdp_port.s);
		LM_DBG("\tReq_sdp_raw_stream [%.*s]\n",
				flow_description->req_sdp_raw_stream.len,
				flow_description->req_sdp_raw_stream.s);
		LM_DBG("\tRpl_sdp_ip_addr [%.*s]\n",
				flow_description->rpl_sdp_ip_addr.len,
				flow_description->rpl_sdp_ip_addr.s);
		LM_DBG("\tRpl_sdp_port [%.*s]\n", flow_description->rpl_sdp_port.len,
				flow_description->rpl_sdp_port.s);
		LM_DBG("\tRpl_sdp_raw_stream [%.*s]\n",
				flow_description->rpl_sdp_raw_stream.len,
				flow_description->rpl_sdp_raw_stream.s);
		LM_DBG("\tRpl_sdp_transport [%.*s]\n",
				flow_description->rpl_sdp_transport.len,
				flow_description->rpl_sdp_transport.s);
		LM_DBG("\tDirection [%d]\n", flow_description->direction);
		flow_description = flow_description->next;
	}
	flow_description = session_data->first_new_flow_description;
	while(flow_description) {
		LM_DBG("New Flow description [%d]\n", flow_description->stream_num);
		LM_DBG("\tMedia [%.*s]\n", flow_description->media.len,
				flow_description->media.s);
		LM_DBG("\tReq_sdp_ip_addr [%.*s]\n",
				flow_description->req_sdp_ip_addr.len,
				flow_description->req_sdp_ip_addr.s);
		LM_DBG("\tReq_sdp_port [%.*s]\n", flow_description->req_sdp_port.len,
				flow_description->req_sdp_port.s);
		LM_DBG("\tReq_sdp_raw_stream [%.*s]\n",
				flow_description->req_sdp_raw_stream.len,
				flow_description->req_sdp_raw_stream.s);
		LM_DBG("\tRpl_sdp_ip_addr [%.*s]\n",
				flow_description->rpl_sdp_ip_addr.len,
				flow_description->rpl_sdp_ip_addr.s);
		LM_DBG("\tRpl_sdp_port [%.*s]\n", flow_description->rpl_sdp_port.len,
				flow_description->rpl_sdp_port.s);
		LM_DBG("\tRpl_sdp_raw_stream [%.*s]\n",
				flow_description->rpl_sdp_raw_stream.len,
				flow_description->rpl_sdp_raw_stream.s);
		LM_DBG("\tRpl_sdp_transport [%.*s]\n",
				flow_description->rpl_sdp_transport.len,
				flow_description->rpl_sdp_transport.s);
		LM_DBG("\tDirection [%d]\n", flow_description->direction);
		flow_description = flow_description->next;
	}

	LM_DBG("=====================\n");
}
