kamailio/src/modules/dialog/dlg_req_within.c

/*
 * Copyright (C) 2007 Voice System SRL
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * 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
 *
*/


/*!
 * \file
 * \brief Requests
 * \ingroup dialog
 * Module: \ref dialog
 */

#include <stdlib.h>
#include <string.h>

#include "../../core/dprint.h"
#include "../../core/ut.h"
#include "../../lib/srdb1/db.h"
#include "../../core/config.h"
#include "../../core/socket_info.h"
#include "../../core/dset.h"
#include "../../modules/tm/dlg.h"
#include "../../modules/tm/tm_load.h"
#include "../../core/counters.h"
#include "../../core/parser/contact/parse_contact.h"
#include "dlg_timer.h"
#include "dlg_hash.h"
#include "dlg_handlers.h"
#include "dlg_req_within.h"
#include "dlg_db_handler.h"


#define MAX_FWD_HDR "Max-Forwards: " MAX_FWD CRLF
#define MAX_FWD_HDR_LEN (sizeof(MAX_FWD_HDR) - 1)

extern str dlg_extra_hdrs;
extern str dlg_lreq_callee_headers;
extern int dlg_ka_failed_limit;
extern int dlg_filter_mode;

extern int bye_early_code;
extern str bye_early_reason;

/**
 *
 */
int free_tm_dlg(dlg_t *td)
{
	if(td) {
		if(td->route_set)
			free_rr(&td->route_set);
		pkg_free(td);
	}
	return 0;
}


dlg_t *build_dlg_t(struct dlg_cell *cell, int dir)
{

	dlg_t *td = NULL;
	str cseq;
	unsigned int loc_seq;
	char nbuf[MAX_URI_SIZE];
	char dbuf[80];
	str nuri = STR_NULL;
	str duri = STR_NULL;
	size_t sz;
	char *p;

	/*remote target--- Request URI*/
	if(cell->contact[dir].s == 0 || cell->contact[dir].len == 0) {
		LM_ERR("no contact available\n");
		goto error;
	}
	if(cell->route_set[dir].s == NULL || cell->route_set[dir].len <= 0) {
		/*try to restore alias parameter if no route set */
		nuri.s = nbuf;
		nuri.len = MAX_URI_SIZE;
		duri.s = dbuf;
		duri.len = 80;
		if(uri_restore_rcv_alias(&cell->contact[dir], &nuri, &duri) < 0) {
			nuri.len = 0;
			duri.len = 0;
		}
	}
	if(nuri.len > 0 && duri.len > 0) {
		sz = sizeof(dlg_t) + (nuri.len + duri.len + 2) * sizeof(char);
	} else {
		sz = sizeof(dlg_t);
	}
	td = (dlg_t *)pkg_malloc(sz);
	if(!td) {
		LM_ERR("out of pkg memory\n");
		return NULL;
	}
	memset(td, 0, sz);

	/*local sequence number*/
	cseq = (dir == DLG_CALLER_LEG) ? cell->cseq[DLG_CALLEE_LEG]
								   : cell->cseq[DLG_CALLER_LEG];
	if(str2int(&cseq, &loc_seq) != 0) {
		LM_ERR("invalid cseq\n");
		goto error;
	}
	/*we don not increase here the cseq as this will be done by TM*/
	td->loc_seq.value = loc_seq;
	td->loc_seq.is_set = 1;

	/*route set*/
	if(cell->route_set[dir].s && cell->route_set[dir].len) {
		if(parse_rr_body(cell->route_set[dir].s, cell->route_set[dir].len,
				   &td->route_set)
				!= 0) {
			LM_ERR("failed to parse route set\n");
			goto error;
		}
	}

	if(nuri.len > 0 && duri.len > 0) {
		/* req uri */
		p = (char *)td + sizeof(dlg_t);
		strncpy(p, nuri.s, nuri.len);
		p[nuri.len] = '\0';
		td->rem_target.s = p;
		td->rem_target.len = nuri.len;
		/* dst uri */
		p += nuri.len + 1;
		strncpy(p, duri.s, duri.len);
		p[duri.len] = '\0';
		td->dst_uri.s = p;
		td->dst_uri.len = duri.len;
	} else {
		td->rem_target = cell->contact[dir];
	}

	td->rem_uri = (dir == DLG_CALLER_LEG) ? cell->from_uri : cell->to_uri;
	td->loc_uri = (dir == DLG_CALLER_LEG) ? cell->to_uri : cell->from_uri;
	td->id.call_id = cell->callid;
	td->id.rem_tag = cell->tag[dir];
	td->id.loc_tag = (dir == DLG_CALLER_LEG) ? cell->tag[DLG_CALLEE_LEG]
											 : cell->tag[DLG_CALLER_LEG];

	td->state = DLG_CONFIRMED;
	td->send_sock = cell->bind_addr[dir];

	return td;

error:
	free_tm_dlg(td);
	return NULL;
}


/* callback function to handle responses to the BYE request */
void bye_reply_cb(struct cell *t, int type, struct tmcb_params *ps)
{

	struct dlg_cell *dlg;
	int event, old_state, new_state, unref, ret;
	dlg_iuid_t *iuid = NULL;

	if(ps->param == NULL || *ps->param == NULL) {
		LM_ERR("invalid parameter\n");
		return;
	}

	if(ps->code < 200) {
		LM_DBG("receiving a provisional reply\n");
		return;
	}

	LM_DBG("receiving a final reply %d\n", ps->code);

	iuid = (dlg_iuid_t *)(*ps->param);
	dlg = dlg_get_by_iuid(iuid);
	if(dlg == 0)
		return;

	event = DLG_EVENT_REQBYE;
	next_state_dlg(dlg, event, &old_state, &new_state, &unref);

	if(new_state == DLG_STATE_DELETED && old_state != DLG_STATE_DELETED) {

		LM_DBG("removing dialog with h_entry %u and h_id %u\n", dlg->h_entry,
				dlg->h_id);

		/* remove from timer */
		ret = remove_dialog_timer(&dlg->tl);
		if(ret < 0) {
			LM_CRIT("unable to unlink the timer on dlg %p [%u:%u] "
					"with clid '%.*s' and tags '%.*s' '%.*s'\n",
					dlg, dlg->h_entry, dlg->h_id, dlg->callid.len,
					dlg->callid.s, dlg->tag[DLG_CALLER_LEG].len,
					dlg->tag[DLG_CALLER_LEG].s, dlg->tag[DLG_CALLEE_LEG].len,
					dlg->tag[DLG_CALLEE_LEG].s);
		} else if(ret > 0) {
			LM_WARN("inconsistent dlg timer data on dlg %p [%u:%u] "
					"with clid '%.*s' and tags '%.*s' '%.*s'\n",
					dlg, dlg->h_entry, dlg->h_id, dlg->callid.len,
					dlg->callid.s, dlg->tag[DLG_CALLER_LEG].len,
					dlg->tag[DLG_CALLER_LEG].s, dlg->tag[DLG_CALLEE_LEG].len,
					dlg->tag[DLG_CALLEE_LEG].s);
		} else {
			unref++;
		}
		/* dialog terminated (BYE) */
		run_dlg_callbacks(DLGCB_TERMINATED_CONFIRMED, dlg, ps->req, ps->rpl,
				DLG_DIR_NONE, 0);

		LM_DBG("first final reply\n");
		/* derefering the dialog */
		dlg_unref(dlg, unref + 1);

		if_update_stat(dlg_enable_stats, active_dlgs, -1);
	}

	if(new_state == DLG_STATE_DELETED && old_state == DLG_STATE_DELETED) {
		/* trash the dialog from DB and memory */
		LM_DBG("second final reply\n");
		/* delete the dialog from DB */
		if(dlg_db_mode)
			remove_dialog_from_db(dlg);
		/* force delete from mem */
		dlg_unref(dlg, 1);
	}
	dlg_iuid_sfree(iuid);
}


/* callback function to handle responses to the keep-alive request */
void dlg_ka_cb_all(struct cell *t, int type, struct tmcb_params *ps, int dir)
{
	int tend;
	dlg_cell_t *dlg;
	dlg_iuid_t *iuid = NULL;

	if(ps->param == NULL || *ps->param == NULL) {
		LM_ERR("invalid parameter\n");
		return;
	}

	if(ps->code < 200) {
		LM_DBG("receiving a provisional reply\n");
		return;
	}

	LM_DBG("receiving a final reply %d\n", ps->code);

	iuid = (dlg_iuid_t *)(*ps->param);
	dlg = dlg_get_by_iuid(iuid);
	if(dlg == 0) {
		dlg_iuid_sfree(iuid);
		return;
	}

	if(ps->code == 408 || ps->code == 481) {
		if(dlg->state != DLG_STATE_CONFIRMED) {
			LM_DBG("skip updating non-confirmed dialogs\n");
			goto done;
		}
		if(ps->code == 408
				&& (dlg->cseq[dir].len == 0
						|| (dlg->cseq[dir].len == 1
								&& dlg->cseq[dir].s[0] == '\0'))) {
			LM_DBG("ignore 408 for %s cseq 0\n",
					((dir == DLG_CALLER_LEG) ? "caller" : "callee"));
			goto done;
		}
		tend = 0;
		if(dir == DLG_CALLER_LEG) {
			dlg->ka_src_counter++;
			if(dlg->ka_src_counter >= dlg_ka_failed_limit) {
				tend = 1;
			}
		} else {
			dlg->ka_dst_counter++;
			if(dlg->ka_dst_counter >= dlg_ka_failed_limit) {
				tend = 1;
			}
		}
		if(tend) {
			if(update_dlg_timer(&dlg->tl, 10) < 0) {
				LM_ERR("failed to update dialog lifetime\n");
				goto done;
			}
			dlg->lifetime = 10;
			dlg->dflags |= DLG_FLAG_CHANGED;
		}
	} else {
		if(dlg->state == DLG_STATE_CONFIRMED) {
			if(dir == DLG_CALLER_LEG) {
				dlg->ka_src_counter = 0;
			} else {
				dlg->ka_dst_counter = 0;
			}
		}
	}

done:
	dlg_unref(dlg, 1);
	dlg_iuid_sfree(iuid);
}

/* callback function to handle responses to the keep-alive request to src */
void dlg_ka_cb_src(struct cell *t, int type, struct tmcb_params *ps)
{
	dlg_ka_cb_all(t, type, ps, DLG_CALLER_LEG);
}

/* callback function to handle responses to the keep-alive request to dst */
void dlg_ka_cb_dst(struct cell *t, int type, struct tmcb_params *ps)
{
	dlg_ka_cb_all(t, type, ps, DLG_CALLEE_LEG);
}

static inline int build_extra_hdr(
		struct dlg_cell *cell, str *extra_hdrs, str *str_hdr)
{
	char *p;
	int blen;

	str_hdr->len = MAX_FWD_HDR_LEN + dlg_extra_hdrs.len;
	if(extra_hdrs && extra_hdrs->len > 0)
		str_hdr->len += extra_hdrs->len;

	blen = str_hdr->len + 3 /* '\r\n\0' */;

	/* reserve space for callee headers in local requests */
	if(dlg_lreq_callee_headers.len > 0)
		blen += dlg_lreq_callee_headers.len + 2 /* '\r\n' */;

	str_hdr->s = (char *)pkg_malloc(blen * sizeof(char));
	if(!str_hdr->s) {
		LM_ERR("out of pkg memory\n");
		goto error;
	}

	memcpy(str_hdr->s, MAX_FWD_HDR, MAX_FWD_HDR_LEN);
	p = str_hdr->s + MAX_FWD_HDR_LEN;
	if(dlg_extra_hdrs.len) {
		memcpy(p, dlg_extra_hdrs.s, dlg_extra_hdrs.len);
		p += dlg_extra_hdrs.len;
	}
	if(extra_hdrs && extra_hdrs->len > 0)
		memcpy(p, extra_hdrs->s, extra_hdrs->len);

	return 0;

error:
	return -1;
}


/* cell- pointer to a struct dlg_cell
 * dir- direction: the request will be sent to:
 * 		DLG_CALLER_LEG (0): caller
 * 		DLG_CALLEE_LEG (1): callee
 */
static inline int send_bye(struct dlg_cell *cell, int dir, str *hdrs)
{
	uac_req_t uac_r;
	dlg_t *dialog_info;
	str met = {"BYE", 3};
	int result;
	dlg_iuid_t *iuid = NULL;
	str lhdrs;

	/* dialog is already in deleted state, nothing to do */
	if(cell->state == DLG_STATE_DELETED) {
		LM_WARN("dlg [%u:%u] with callid %.*s already in deleted state, BYE "
				"not sent.\n",
				cell->h_entry, cell->h_id, cell->callid.len, cell->callid.s);
		return 0;
	}

	/* Send Cancel or final response for non-confirmed dialogs */
	if(cell->state != DLG_STATE_CONFIRMED_NA
			&& cell->state != DLG_STATE_CONFIRMED) {
		if(cell->t) {
			if(dir == DLG_CALLER_LEG) {
				if(d_tmb.t_reply(cell->t->uas.request, bye_early_code,
						   bye_early_reason.s)
						< 0) {
					LM_ERR("Failed to send reply to caller\n");
					return -1;
				}
				LM_DBG("\"%d %.*s\" sent to caller\n", bye_early_code,
						bye_early_reason.len, bye_early_reason.s);
			} else {
				d_tmb.cancel_all_uacs(cell->t, 0);
				LM_DBG("CANCEL sent to callee(s)\n");
			}
			return 0;
		} else {
			LM_ERR("terminating non-confirmed dialog not possible, transaction "
				   "not longer available.\n");
			return -1;
		}
	}

	/*verify direction*/

	if((dialog_info = build_dlg_t(cell, dir)) == 0) {
		LM_ERR("failed to create dlg_t\n");
		goto err;
	}

	/* safety bump of cseq if prack was involved in call setup */
	if(cell->iflags & DLG_IFLAG_PRACK) {
		dialog_info->loc_seq.value += 80;
	}

	LM_DBG("sending BYE to %s\n",
			(dir == DLG_CALLER_LEG) ? "caller" : "callee");

	iuid = dlg_get_iuid_shm_clone(cell);
	if(iuid == NULL) {
		LM_ERR("failed to create dialog unique id clone\n");
		goto err;
	}

	lhdrs = *hdrs;

	if(dir == DLG_CALLEE_LEG && dlg_lreq_callee_headers.len > 0) {
		/* space allocated in hdrs->s by build_extra_hdrs() */
		memcpy(lhdrs.s + lhdrs.len, dlg_lreq_callee_headers.s,
				dlg_lreq_callee_headers.len);
		lhdrs.len += dlg_lreq_callee_headers.len;
		if(dlg_lreq_callee_headers.s[dlg_lreq_callee_headers.len - 1] != '\n') {
			memcpy(lhdrs.s + lhdrs.len, CRLF, CRLF_LEN);
			lhdrs.len += CRLF_LEN;
		}
	}

	set_uac_req(&uac_r, &met, &lhdrs, NULL, dialog_info, TMCB_LOCAL_COMPLETED,
			bye_reply_cb, (void *)iuid);
	result = d_tmb.t_request_within(&uac_r);

	if(result < 0) {
		LM_ERR("failed to send the BYE request\n");
		goto err;
	}

	free_tm_dlg(dialog_info);

	LM_DBG("BYE sent to %s\n", (dir == 0) ? "caller" : "callee");
	return 0;

err:
	if(dialog_info)
		free_tm_dlg(dialog_info);
	return -1;
}

dlg_t *build_dlg_t_early(
		struct sip_msg *msg, struct dlg_cell *cell, int branch_id, str *rr_set)
{

	dlg_t *td = NULL;
	str cseq;
	unsigned int loc_seq;
	char nbuf[MAX_URI_SIZE];
	char dbuf[80];
	str nuri = STR_NULL;
	str duri = STR_NULL;
	size_t sz;
	char *p;
	unsigned int own_rr = 0, skip_recs = 0;

	if(cell->state != DLG_STATE_UNCONFIRMED && cell->state != DLG_STATE_EARLY) {
		LM_ERR("invalid state for build_dlg_state: %d"
			   " (only working for unconfirmed or early dialogs)\n",
				cell->state);
		goto error;
	}

	if(msg == NULL || msg->first_line.type != SIP_REPLY) {
		if(!cell->t) {
			LM_ERR("no transaction associated\n");
			goto error;
		}

		if(branch_id <= 0 || branch_id > cell->t->nr_of_outgoings) {
			LM_ERR("invalid branch %d (%d branches in transaction)\n",
					branch_id, cell->t->nr_of_outgoings);
			goto error;
		}
	}

	if(!msg->contact
			&& (parse_headers(msg, HDR_CONTACT_F, 0) < 0 || !msg->contact)) {
		LM_ERR("bad sip message or missing Contact hdr\n");
		goto error;
	}

	if(parse_contact(msg->contact) < 0
			|| ((contact_body_t *)msg->contact->parsed)->contacts == NULL) {
		LM_ERR("bad Contact HDR\n");
		goto error;
	}

	/*try to restore alias parameter if no route set */
	nuri.s = nbuf;
	nuri.len = MAX_URI_SIZE;
	duri.s = dbuf;
	duri.len = 80;
	if(uri_restore_rcv_alias(
			   &((contact_body_t *)msg->contact->parsed)->contacts->uri, &nuri,
			   &duri)
			< 0) {
		nuri.len = 0;
		duri.len = 0;
	}

	if(nuri.len > 0 && duri.len > 0) {
		sz = sizeof(dlg_t) + (nuri.len + duri.len + 2) * sizeof(char);
	} else {
		sz = sizeof(dlg_t);
	}

	td = (dlg_t *)pkg_malloc(sz);
	if(!td) {
		LM_ERR("out of pkg memory\n");
		return NULL;
	}
	memset(td, 0, sz);

	/*route set*/
	if(msg->record_route) {
		if(cell->t) {
			LM_DBG("transaction exists\n");
			own_rr = (cell->t->flags & TM_UAC_FLAG_R2)	 ? 2
					 : (cell->t->flags & TM_UAC_FLAG_RR) ? 1
														 : 0;
		} else {
			own_rr = (msg->flags & TM_UAC_FLAG_R2)	 ? 2
					 : (msg->flags & TM_UAC_FLAG_RR) ? 1
													 : 0;
		}
		skip_recs = cell->from_rr_nb + own_rr;

		LM_DBG("skipping %u records, %u of myself\n", skip_recs, own_rr);

		if(print_rr_body(msg->record_route, rr_set, DLG_CALLEE_LEG, &skip_recs)
				!= 0) {
			LM_ERR("failed to print route records \n");
			goto error;
		}
		LM_DBG("new route set: %.*s\n", STR_FMT(rr_set));

		if(parse_rr_body(rr_set->s, rr_set->len, &td->route_set) != 0) {
			LM_ERR("failed to parse route set\n");
			goto error;
		}
	}

	/*local sequence number*/
	cseq = cell->cseq[DLG_CALLER_LEG];

	if(cseq.len > 0) {
		LM_DBG("CSeq is %.*s\n", cseq.len, cseq.s);
		if(str2int(&cseq, &loc_seq) != 0) {
			LM_ERR("invalid cseq\n");
			goto error;
		}
	} else {
		LM_DBG("CSeq not set yet, assuming 1\n");
		loc_seq = 1;
	}

	/*we don not increase here the cseq as this will be done by TM*/
	td->loc_seq.value = loc_seq;
	td->loc_seq.is_set = 1;

	LM_DBG("nuri: %.*s\n", STR_FMT(&nuri));
	LM_DBG("duri: %.*s\n", STR_FMT(&duri));

	if(nuri.len > 0 && duri.len > 0) {
		/* req uri */
		p = (char *)td + sizeof(dlg_t);
		strncpy(p, nuri.s, nuri.len);
		p[nuri.len] = '\0';
		td->rem_target.s = p;
		td->rem_target.len = nuri.len;
		/* dst uri */
		p += nuri.len + 1;
		strncpy(p, duri.s, duri.len);
		p[duri.len] = '\0';
		td->dst_uri.s = p;
		td->dst_uri.len = duri.len;
	} else {
		td->rem_target =
				((contact_body_t *)msg->contact->parsed)->contacts->uri;
	}

	td->rem_uri = cell->from_uri;
	td->loc_uri = cell->to_uri;
	LM_DBG("rem_uri: %.*s\n", STR_FMT(&td->rem_uri));
	LM_DBG("loc_uri: %.*s\n", STR_FMT(&td->loc_uri));

	LM_DBG("rem_target: %.*s\n", STR_FMT(&td->rem_target));
	LM_DBG("dst_uri: %.*s\n", STR_FMT(&td->dst_uri));

	td->id.call_id = cell->callid;
	td->id.rem_tag = cell->tag[DLG_CALLER_LEG];
	td->id.loc_tag = cell->tag[DLG_CALLEE_LEG];

	td->state = DLG_EARLY;
	td->send_sock = cell->bind_addr[DLG_CALLER_LEG];

	return td;

error:
	LM_ERR("Error occurred creating early dialog\n");
	free_tm_dlg(td);
	return NULL;
}

int dlg_request_within(struct sip_msg *msg, struct dlg_cell *dlg, int side,
		str *method, str *hdrs, str *content_type, str *content)
{
	uac_req_t uac_r;
	dlg_t *dialog_info;
	int result;
	dlg_iuid_t *iuid = NULL;
	char rr_set_s[MAX_URI_SIZE];
	str rr_set = {rr_set_s, 0};
	str allheaders = {0, 0};
	str content_type_hdr = {"Content-Type: ", 14};
	int idx = 0;
	memset(rr_set_s, 0, 500);

	/* Special treatment for callee in early state*/
	if(dlg->state != DLG_STATE_CONFIRMED_NA && dlg->state != DLG_STATE_CONFIRMED
			&& side == DLG_CALLEE_LEG) {
		LM_DBG("Send request to callee in early state...\n");

		if(dlg->t == NULL && d_tmb.t_gett) {
			dlg->t = d_tmb.t_gett();
			if(dlg->t && dlg->t != T_UNDEFINED)
				idx = dlg->t->nr_of_outgoings;
		}
		LM_DBG("Branch %i\n", idx);

		/*verify direction*/
		if((dialog_info = build_dlg_t_early(msg, dlg, idx, &rr_set)) == 0) {
			LM_ERR("failed to create dlg_t\n");
			goto err;
		}
	} else {
		LM_DBG("Send request to caller or in confirmed state...\n");
		/*verify direction*/
		if((dialog_info = build_dlg_t(dlg, side)) == 0) {
			LM_ERR("failed to create dlg_t\n");
			goto err;
		}
	}

	LM_DBG("sending %.*s to %s\n", method->len, method->s,
			(side == DLG_CALLER_LEG) ? "caller" : "callee");

	iuid = dlg_get_iuid_shm_clone(dlg);
	if(iuid == NULL) {
		LM_ERR("failed to create dialog unique id clone\n");
		goto err;
	}

	if(hdrs && hdrs->len > 0) {
		LM_DBG("Extra headers: %.*s\n", STR_FMT(hdrs));
		allheaders.len += hdrs->len;
	}

	if(content_type && content_type->s && content && content->s) {
		LM_DBG("Content-Type: %.*s\n", STR_FMT(content_type));
		allheaders.len += content_type_hdr.len + content_type->len + 2;
	}
	if(allheaders.len > 0) {
		allheaders.s = (char *)pkg_malloc(allheaders.len);
		if(allheaders.s == NULL) {
			PKG_MEM_ERROR;
			goto err;
		}
		allheaders.len = 0;
		if(hdrs && hdrs->len > 0) {
			memcpy(allheaders.s, hdrs->s, hdrs->len);
			allheaders.len += hdrs->len;
		}
		if(content_type && content_type->s && content && content->s) {
			memcpy(allheaders.s + allheaders.len, content_type_hdr.s,
					content_type_hdr.len);
			allheaders.len += content_type_hdr.len;
			memcpy(allheaders.s + allheaders.len, content_type->s,
					content_type->len);
			allheaders.len += content_type->len;
			memcpy(allheaders.s + allheaders.len, "\r\n", 2);
			allheaders.len += 2;
		}
		LM_DBG("All headers: %.*s\n", STR_FMT(&allheaders));
	}

	set_uac_req(&uac_r, method, allheaders.len ? &allheaders : NULL,
			(content && content->len) ? content : NULL, dialog_info,
			TMCB_LOCAL_COMPLETED, NULL, NULL);

	result = d_tmb.t_request_within(&uac_r);

	if(allheaders.s)
		pkg_free(allheaders.s);

	if(result < 0) {
		LM_ERR("failed to send request\n");
		goto err;
	}

	free_tm_dlg(dialog_info);

	LM_DBG("%.*s sent to %s\n", method->len, method->s,
			(side == DLG_CALLER_LEG) ? "caller" : "callee");

	return 0;
err:
	if(dialog_info)
		free_tm_dlg(dialog_info);
	return -1;
}

/* send keep-alive
 * dlg - pointer to a struct dlg_cell
 * dir - direction: the request will be sent to:
 * 		DLG_CALLER_LEG (0): caller
 * 		DLG_CALLEE_LEG (1): callee
 */
int dlg_send_ka(dlg_cell_t *dlg, int dir)
{
	uac_req_t uac_r;
	dlg_t *di;
	str met = {"OPTIONS", 7};
	int result;
	dlg_iuid_t *iuid = NULL;

	if(dlg_filter_mode & DLG_FILTER_LOCALONLY) {
		if(dlg->bind_addr[dir] == NULL) {
			LM_DBG("skipping dialog without bind address\n");
			return 0;
		}

		if(lookup_local_socket(&(dlg->bind_addr[dir]->sock_str)) == NULL) {
			LM_DBG("skipping non local dialog\n");
			return 0;
		}
	}

	/* do not send KA request for non-confirmed dialogs (not supported) */
	if(dlg->state != DLG_STATE_CONFIRMED) {
		LM_DBG("skipping non-confirmed dialogs\n");
		return 0;
	}

	/* build tm dlg by direction */
	if((di = build_dlg_t(dlg, dir)) == 0) {
		LM_ERR("failed to create dlg_t\n");
		goto err;
	}

	/* tm increases cseq value, decrease it no to make it invalid
	 * - dialog is ended on timeout (408) or C/L does not exist (481) */
	if(di->loc_seq.value > 1)
		di->loc_seq.value -= 2;
	else
		di->loc_seq.value -= 1;

	LM_DBG("sending OPTIONS to %s\n",
			(dir == DLG_CALLER_LEG) ? "caller" : "callee");

	iuid = dlg_get_iuid_shm_clone(dlg);
	if(iuid == NULL) {
		LM_ERR("failed to create dialog unique id clone\n");
		goto err;
	}

	if(dir == DLG_CALLEE_LEG && dlg_lreq_callee_headers.len > 0) {
		set_uac_req(&uac_r, &met, &dlg_lreq_callee_headers, NULL, di,
				TMCB_LOCAL_COMPLETED, dlg_ka_cb_dst, (void *)iuid);
	} else {
		set_uac_req(&uac_r, &met, NULL, NULL, di, TMCB_LOCAL_COMPLETED,
				(dir == DLG_CALLEE_LEG) ? dlg_ka_cb_dst : dlg_ka_cb_src,
				(void *)iuid);
	}
	result = d_tmb.t_request_within(&uac_r);

	if(result < 0) {
		LM_ERR("failed to send the OPTIONS request\n");
		goto err;
	}

	free_tm_dlg(di);

	LM_DBG("keep-alive sent to %s\n", (dir == 0) ? "caller" : "callee");
	return 0;

err:
	if(di)
		free_tm_dlg(di);
	return -1;
}


int dlg_bye(struct dlg_cell *dlg, str *hdrs, int side)
{
	str all_hdrs = {0, 0};
	int ret;

	if(side == DLG_CALLER_LEG) {
		if(dlg->dflags & DLG_FLAG_CALLERBYE)
			return -1;
		dlg->dflags |= DLG_FLAG_CALLERBYE;
	} else {
		if(dlg->dflags & DLG_FLAG_CALLEEBYE)
			return -1;
		dlg->dflags |= DLG_FLAG_CALLEEBYE;
	}
	if((build_extra_hdr(dlg, hdrs, &all_hdrs)) != 0) {
		LM_ERR("failed to build dlg headers\n");
		return -1;
	}
	ret = send_bye(dlg, side, &all_hdrs);
	pkg_free(all_hdrs.s);

	dlg_run_event_route(dlg, NULL, dlg->state, DLG_STATE_DELETED);

	return ret;
}

int dlg_bye_all(struct dlg_cell *dlg, str *hdrs)
{
	str all_hdrs = {0, 0};
	int ret;

	/* run dialog terminated callbacks */
	run_dlg_callbacks(DLGCB_TERMINATED, dlg, NULL, NULL, DLG_DIR_NONE, 0);

	if((build_extra_hdr(dlg, hdrs, &all_hdrs)) != 0) {
		LM_ERR("failed to build dlg headers\n");
		return -1;
	}

	ret = send_bye(dlg, DLG_CALLER_LEG, &all_hdrs);
	ret |= send_bye(dlg, DLG_CALLEE_LEG, &all_hdrs);

	pkg_free(all_hdrs.s);

	dlg_run_event_route(dlg, NULL, dlg->state, DLG_STATE_DELETED);

	return ret;
}