/*
 * $Id: rpid.c,v 1.4 2006/05/07 20:48:51 miconda Exp $
 *
 * Remote-Party-ID related functions
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of openser, a free SIP server.
 *
 * openser 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
 *
 * openser 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * History:
 * --------
 * 2003-04-28 rpid contributed by Juha Heinanen added (janakj)
 * 2005-05-31 general avp specification added for rpid (bogdan)
 */

#include <string.h>
#include <strings.h>
#include "../../str.h"
#include "../../data_lump.h"
#include "../../dprint.h"
#include "../../mem/mem.h"
#include "../../parser/parse_nameaddr.h"
#include "../../parser/parse_uri.h"
#include "../../parser/parser_f.h"
#include "../../ut.h"
#include "../../usr_avp.h"
#include "auth_mod.h"
#include "api.h"
#include "rpid.h"


#define RPID_HF_NAME "Remote-Party-ID: "
#define RPID_HF_NAME_LEN (sizeof(RPID_HF_NAME) - 1)

/* rpid AVP specs */
static int     rpid_avp_type = 0;
static int_str rpid_avp = (int_str)0;
static str     rpid_str;


/*
 * Parse and set the RPID AVP specs
 */
int init_rpid_avp(char *rpid_avp_param)
{
	if (rpid_avp_param && *rpid_avp_param) {
		rpid_str.s = rpid_avp_param;
		rpid_str.len = strlen(rpid_str.s);
		if (parse_avp_spec( &rpid_str, &rpid_avp_type,
		&rpid_avp)<0) {
			LOG(L_CRIT,"ERROR:auth:init_rpid_avp: invalid rpid "
				"AVP specs \"%s\"\n", rpid_avp_param);
			return -1;
		}
	}
	return 0;
}


/*
 * Gets the RPID avp specs
 */
void get_rpid_avp( int_str *rpid_avp_p, int *rpid_avp_type_p )
{
	*rpid_avp_p = rpid_avp;
	*rpid_avp_type_p = rpid_avp_type;
}


/*
 * Copy of is_e164 from enum module
 */
static inline int is_e164(str* _user)
{
	int i;
	char c;
	
	if ((_user->len > 2) && (_user->len < 17) && ((_user->s)[0] == '+')) {
		for (i = 1; i <= _user->len; i++) {
			c = (_user->s)[i];
			if (c < '0' && c > '9') return -1;
		}
		return 1;
	}
	return -1;
}


/* 
 * Copy of append_hf_helper from textops.
 */
static inline int append_rpid_helper(struct sip_msg* _m, str *_s)
{
	struct lump* anchor;
	
	if (parse_headers(_m, HDR_EOH_F, 0) == -1) {
		LOG(L_ERR, "append_rpid(): Error while parsing message\n");
		return -1;
	}
	
	anchor = anchor_lump(_m, _m->unparsed - _m->buf, 0, 0);
	if (!anchor) {
		LOG(L_ERR, "append_rpid(): Can't get anchor\n");
		return -2;
	}
	
	if (!insert_new_lump_before(anchor, _s->s, _s->len, 0)) {
		LOG(L_ERR, "append_rpid(): Can't insert lump\n");
		return -3;
	}

	return 0;
}


/*
 * Append RPID header field to the message
 */
int append_rpid_hf(struct sip_msg* _m, char* _s1, char* _s2)
{
	struct usr_avp *avp;
	str rpid_hf, rpid;
	char *at;
	int_str val;

	if (rpid_avp.s.s==0) {
		LOG(L_ERR,"BUG_SCRIPT:auth:append_rpid_hf: rpid avp not defined\n");
		return -1;
	}

	if ( (avp=search_first_avp( rpid_avp_type , rpid_avp, &val, 0))==0 ) {
		DBG("append_rpid_hf: No rpid AVP\n");
		return -1;
	}

	if ( !(avp->flags&AVP_VAL_STR) ||  !val.s.s || !val.s.len) {
		DBG("append_rpid_hf: Empty or non-string rpid, nothing to append\n");
		return -1;
	}

	rpid = val.s;

	rpid_hf.len = RPID_HF_NAME_LEN + rpid_prefix.len + rpid.len
					+ rpid_suffix.len + CRLF_LEN;
	rpid_hf.s = pkg_malloc(rpid_hf.len);
	if (!rpid_hf.s) {
		LOG(L_ERR, "append_rpid_hf(): No memory left\n");
		return -1;
	}

	at = rpid_hf.s;
	memcpy(at, RPID_HF_NAME, RPID_HF_NAME_LEN);
	at += RPID_HF_NAME_LEN;

	memcpy(at, rpid_prefix.s, rpid_prefix.len);
	at += rpid_prefix.len;

	memcpy(at, rpid.s, rpid.len);
	at += rpid.len;

	memcpy(at, rpid_suffix.s, rpid_suffix.len);
	at += rpid_suffix.len;

	memcpy(at, CRLF, CRLF_LEN);

	if (append_rpid_helper(_m, &rpid_hf) < 0) {
		pkg_free(rpid_hf.s);
		return -1;
	}

	return 1;
}


/*
 * Append RPID header field to the message with parameters
 */
int append_rpid_hf_p(struct sip_msg* _m, char* _prefix, char* _suffix)
{
	struct usr_avp *avp;
	str rpid_hf, rpid;
	char* at;
	str* p, *s;
	int_str val;

	if (rpid_avp.s.s==0) {
		LOG(L_ERR,"BUG_SCRIPT:auth:append_rpid_hf: rpid avp not defined\n");
		return -1;
	}

	if ( (avp=search_first_avp( rpid_avp_type , rpid_avp, &val, 0))==0 ) {
		DBG("append_rpid_hf: No rpid AVP\n");
		return -1;
	}

	if ( !(avp->flags&AVP_VAL_STR) ||  !val.s.s || !val.s.len) {
		DBG("append_rpid_hf: Empty or non-string rpid, nothing to append\n");
		return -1;
	}

	rpid = val.s;

	p = (str*)_prefix;
	s = (str*)_suffix;

	rpid_hf.len = RPID_HF_NAME_LEN + p->len + rpid.len + s->len + CRLF_LEN;
	rpid_hf.s = pkg_malloc(rpid_hf.len);
	if (!rpid_hf.s) {
		LOG(L_ERR, "append_rpid_hf_p(): No memory left\n");
		return -1;
	}

	at = rpid_hf.s;
	memcpy(at, RPID_HF_NAME, RPID_HF_NAME_LEN);
	at += RPID_HF_NAME_LEN;

	memcpy(at, p->s, p->len);
	at += p->len;

	memcpy(at, rpid.s, rpid.len);
	at += rpid.len;

	memcpy(at, s->s, s->len);
	at += s->len;

	memcpy(at, CRLF, CRLF_LEN);

	if (append_rpid_helper(_m, &rpid_hf) < 0) {
		pkg_free(rpid_hf.s);
		return -1;
	}

	return 1;
}


/*
 * Check if SIP URI in rpid contains an e164 user part
 */
int is_rpid_user_e164(struct sip_msg* _m, char* _s1, char* _s2)
{
	struct usr_avp *avp;
	name_addr_t parsed;
	str tmp, user, rpid;
	struct sip_uri uri;
	int_str val;

	if (rpid_avp.s.s==0) {
		LOG(L_ERR,"BUG_SCRIPT:auth:append_rpid_hf: rpid avp not defined\n");
		return -1;
	}

	if ( (avp=search_first_avp( rpid_avp_type , rpid_avp, &val, 0))==0 ) {
		DBG("is_rpid_user_e164: No rpid AVP\n");
		goto err;
	}

	if ( !(avp->flags&AVP_VAL_STR) ||  !val.s.s || !val.s.len) {
		DBG("append_rpid_hf: Empty or non-string rpid, nothing to append\n");
		return -1;
	}

	rpid = val.s;

	if (find_not_quoted(&rpid, '<')) {
		if (parse_nameaddr(&rpid, &parsed) < 0) {
			LOG(L_ERR, "is_rpid_user_e164(): Error while parsing RPID\n");
			goto err;
		}
		tmp = parsed.uri;
	} else {
		tmp = rpid;
	}

	if ((tmp.len > 4) && (!strncasecmp(tmp.s, "sip:", 4))) {
		if (parse_uri(tmp.s, tmp.len, &uri) < 0) {
			LOG(L_ERR, "is_rpid_user_e164(): Error while parsing RPID URI\n");
			goto err;
		}
		user = uri.user;
	} else {
		user = tmp;
	}

	return ((is_e164(&user) == 1) ? 1 : -1);
err:
	return -1;
}