/*
 * $Id$ 
 *
 * via parsing automaton
 * 
 *
 * Copyright (C) 2001-2003 Fhg Fokus
 *
 * This file is part of ser, a free SIP server.
 *
 * ser 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
 *
 * For a license to use the ser software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact iptel.org by e-mail at the following addresses:
 *    info@iptel.org
 *
 * ser 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
 */


/* parsing:           compact form:
 */

/* 
 * still TODO/test:
 *  x parse next via
 *  - return a list of header structs
 *  - return list of params
 */



#include <stdlib.h>
#include <string.h>
#include "../dprint.h"
#include "../ut.h"
#include "../mem/mem.h"
#include "../ip_addr.h"
#include "parse_via.h"
#include "parse_def.h"



/* main via states (uri:port ...) */
enum {	         
	F_HOST, P_HOST,
	L_PORT, F_PORT, P_PORT,
	L_PARAM, F_PARAM, P_PARAM,
	L_VIA, F_VIA,
	F_COMMENT, P_COMMENT,
	F_IP6HOST, P_IP6HOST,
	F_CRLF,
	F_LF,
	F_CR,
	END_OF_HEADER
};


/* first via part state */
enum {
	F_SIP = 100,
	SIP1, SIP2, FIN_SIP,
	L_VER, F_VER,
	VER1, VER2, FIN_VER,
	UDP1, UDP2, FIN_UDP,
	TCP1, TCP2, FIN_TCP,
	L_PROTO, F_PROTO
};


/* param related states
 * WARNING: keep the FIN*, GEN_PARAM & PARAM_ERROR in sync w/ PARAM_* from
 * msg_parser.h !*/
enum {	
	L_VALUE = 200, F_VALUE, P_VALUE, P_STRING,
	HIDDEN1, HIDDEN2, HIDDEN3, HIDDEN4, HIDDEN5,
	TTL1, TTL2,
	BRANCH1, BRANCH2, BRANCH3, BRANCH4, BRANCH5,
	MADDR1, MADDR2, MADDR3, MADDR4,
	RECEIVED1, RECEIVED2, RECEIVED3, RECEIVED4, RECEIVED5, RECEIVED6,
	RECEIVED7,
	     /* fin states (227-...)*/
	FIN_HIDDEN = 230, FIN_TTL, FIN_BRANCH, FIN_MADDR, FIN_RECEIVED,
	     /*GEN_PARAM,
	       PARAM_ERROR*/ /* declared in msg_parser.h*/
};


/* entry state must be F_PARAM, or saved_state=F_PARAM and
 * state=F_{LF,CR,CRLF}!
 * output state = L_PARAM or F_PARAM or END_OF_HEADER
 * (and saved_state= last state); everything else => error 
 */
static /*inline*/ char* parse_via_param(char* p, char* end,
										unsigned char* pstate, 
				    					unsigned char* psaved_state,
										struct via_param* param)
{
	char* tmp;
	register unsigned char state;
	unsigned char saved_state;

	state=*pstate;
	saved_state=*psaved_state;
	param->type=PARAM_ERROR;

	for (tmp=p;tmp<end;tmp++){
		switch(*tmp){
			case ' ':
			case '\t':
				switch(state){
					case FIN_HIDDEN:
						*tmp=0;
						param->type=state;
						param->name.len=tmp-param->name.s;
						state=L_PARAM;
						goto endofparam;
					case FIN_BRANCH:
					case FIN_TTL:
					case FIN_MADDR:
					case FIN_RECEIVED:
						*tmp=0;
						param->type=state;
						param->name.len=tmp-param->name.s;
						state=L_VALUE;
						goto find_value;
					case F_PARAM:
						break;
					case F_LF:
					case F_CR:
					case F_CRLF:
						state=saved_state;
						break;
					case GEN_PARAM:
					default:
						*tmp=0;
						param->type=GEN_PARAM;
						param->name.len=tmp-param->name.s;
						state=L_VALUE;
						goto find_value;
				}
				break;
			/* \n and \r*/
			case '\n':
				switch(state){
					case FIN_HIDDEN:
						*tmp=0;
						param->type=state;
						param->name.len=tmp-param->name.s;
						saved_state=L_PARAM;
						state=F_LF;
						goto endofparam;
					case FIN_BRANCH:
					case FIN_TTL:
					case FIN_MADDR:
					case FIN_RECEIVED:
						*tmp=0;
						param->type=state;
						param->name.len=tmp-param->name.s;
						saved_state=L_VALUE;
						state=F_LF;
						goto find_value;
					case F_PARAM:
						saved_state=state;
						state=F_LF;
						break;
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					case F_CR:
						state=F_CRLF;
						break;
					case GEN_PARAM:
					default:
						*tmp=0;
						param->type=GEN_PARAM;
						saved_state=L_VALUE;
						param->name.len=tmp-param->name.s;
						state=F_LF;
						goto find_value;
				}
				break;
			case '\r':
				switch(state){
					case FIN_HIDDEN:
						*tmp=0;
						param->type=state;
						param->name.len=tmp-param->name.s;
						saved_state=L_PARAM;
						state=F_CR;
						goto endofparam;
					case FIN_BRANCH:
					case FIN_TTL:
					case FIN_MADDR:
					case FIN_RECEIVED:
						*tmp=0;
						param->type=state;
						param->name.len=tmp-param->name.s;
						saved_state=L_VALUE;
						state=F_CR;
						goto find_value;
					case F_PARAM:
						saved_state=state;
						state=F_CR;
						break;
					case F_CR:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					case GEN_PARAM:
					default:
						*tmp=0;
						param->type=GEN_PARAM;
						param->name.len=tmp-param->name.s;
						saved_state=L_VALUE;
						state=F_CR;
						goto find_value;
				}
				break;

			case '=':
				switch(state){
					case FIN_BRANCH:
					case FIN_TTL:
					case FIN_MADDR:
					case FIN_RECEIVED:
						*tmp=0;
						param->type=state;
						param->name.len=tmp-param->name.s;
						state=F_VALUE;
						goto find_value;
					case F_PARAM:
					case FIN_HIDDEN:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c> in"
								" state %d\n", *tmp, state);
						goto error;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					case GEN_PARAM:
					default:
						*tmp=0;
						param->type=GEN_PARAM;
						param->name.len=tmp-param->name.s;
						state=F_VALUE;
						goto find_value;
				}
				break;
			case ';':
				switch(state){
					case FIN_HIDDEN:
						*tmp=0;
						param->type=state;
						param->name.len=tmp-param->name.s;
						state=F_PARAM;
						goto endofparam;
					case FIN_BRANCH:
					case FIN_MADDR:
					case FIN_TTL:
					case FIN_RECEIVED:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c> in"
								" state %d\n", *tmp, state);
						goto error;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					case GEN_PARAM:
					default:
						*tmp=0;
						param->type=GEN_PARAM;
						param->name.len=tmp-param->name.s;
						state=F_PARAM;
						goto endofparam;
				}
				break;
			case ',':
				switch(state){
					case FIN_HIDDEN:
						*tmp=0;
						param->type=state;
						param->name.len=tmp-param->name.s;
						state=F_VIA;
						goto endofvalue;
					case FIN_BRANCH:
					case FIN_MADDR:
					case FIN_TTL:
					case FIN_RECEIVED:
						LOG(L_ERR, "ERROR: parse_via_param: new via found" 
								"(',') when '=' expected (state %d=)\n",
								state);
						goto error; /* or we could ignore this bad param*/
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					case GEN_PARAM:
					default:
						*tmp=0;
						param->type=GEN_PARAM;
						param->name.len=tmp-param->name.s;
						state=F_VIA;
						goto endofvalue;
				}
				break; 

				/* param names */
			case 'h':
			case 'H':
				switch(state){
					case F_PARAM:
						state=HIDDEN1;
						param->name.s=tmp;
						break;
					case BRANCH5:
						state=FIN_BRANCH;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'i':
			case 'I':
				switch(state){
					case F_PARAM:
						state=GEN_PARAM;
						param->name.s=tmp;
						break;
					case HIDDEN1:
						state=HIDDEN2;
						break;
					case RECEIVED4:
						state=RECEIVED5;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'd':
			case 'D':
				switch(state){
					case F_PARAM:
						state=GEN_PARAM;
						param->name.s=tmp;
						break;
					case HIDDEN2:
						state=HIDDEN3;
						break;
					case HIDDEN3:
						state=HIDDEN4;
						break;
					case MADDR2:
						state=MADDR3;
						break;
					case MADDR3:
						state=MADDR4;
						break;
					case RECEIVED7:
						state=FIN_RECEIVED;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'e':
			case 'E':
				switch(state){
					case F_PARAM:
						state=GEN_PARAM;
						param->name.s=tmp;
						break;
					case HIDDEN4:
						state=HIDDEN5;
						break;
					case RECEIVED1:
						state=RECEIVED2;
						break;
					case RECEIVED3:
						state=RECEIVED4;
						break;
					case RECEIVED6:
						state=RECEIVED7;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'n':
			case 'N':
				switch(state){
					case F_PARAM:
						state=GEN_PARAM;
						param->name.s=tmp;
						break;
					case HIDDEN5:
						state=FIN_HIDDEN;
						break;
					case BRANCH3:
						state=BRANCH4;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;
			case 't':
			case 'T':
				switch(state){
					case F_PARAM:
						state=TTL1;
						param->name.s=tmp;
						break;
					case TTL1:
						state=TTL2;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'l':
			case 'L':
				switch(state){
					case F_PARAM:
						state=GEN_PARAM;
						param->name.s=tmp;
						break;
					case TTL2:
						state=FIN_TTL;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'm':
			case 'M':
				switch(state){
					case F_PARAM:
						state=MADDR1;
						param->name.s=tmp;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'a':
			case 'A':
				switch(state){
					case F_PARAM:
						state=GEN_PARAM;
						param->name.s=tmp;
						break;
					case MADDR1:
						state=MADDR2;
						break;
					case BRANCH2:
						state=BRANCH3;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'r':
			case 'R':
				switch(state){
					case MADDR4:
						state=FIN_MADDR;
						break;
					case F_PARAM:
						state=RECEIVED1;
						param->name.s=tmp;
						break;
					case BRANCH1:
						state=BRANCH2;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'c':
			case 'C':
				switch(state){
					case F_PARAM:
						state=GEN_PARAM;
						param->name.s=tmp;
						break;
					case RECEIVED2:
						state=RECEIVED3;
						break;
					case BRANCH4:
						state=BRANCH5;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'v':
			case 'V':
				switch(state){
					case F_PARAM:
						state=GEN_PARAM;
						param->name.s=tmp;
						break;
					case RECEIVED5:
						state=RECEIVED6;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'b':
			case 'B':
				switch(state){
					case F_PARAM:
						state=BRANCH1;
						param->name.s=tmp;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
				break;

			default:
				switch(state){
					case F_PARAM:
						state=GEN_PARAM;
						param->name.s=tmp;
						break;
					case  GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						state=GEN_PARAM;
				}
		}
	}/* for tmp*/

	/* end of packet? => error, no cr/lf,',' found!!!*/
	saved_state=state;
	state=END_OF_HEADER;
	goto error;
	
 find_value:
	tmp++;
	for(;*tmp;tmp++){
		switch(*tmp){
			case ' ':
			case '\t':
				switch(state){
					case L_VALUE:
					case F_VALUE: /*eat space*/
						break; 
					case P_VALUE:
						*tmp=0;
						state=L_PARAM;
						param->value.len=tmp-param->value.s;
						goto endofvalue;
					case P_STRING:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=saved_state;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", *tmp, state);
						goto error;
				}
				break;
			case '\n':
				switch(state){
					case L_VALUE:
					case F_VALUE: /*eat space*/
					case P_STRING:
						saved_state=state;
						state=F_LF;
						break;
					case P_VALUE:
						*tmp=0;
						saved_state=L_PARAM;
						state=F_LF;
						param->value.len=tmp-param->value.s;
						goto endofvalue;
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					case F_CR:
						state=F_CRLF;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", *tmp, state);
						goto error;
				}
				break;
			case '\r':
				switch(state){
					case L_VALUE:
					case F_VALUE: /*eat space*/
					case P_STRING:
						saved_state=state;
						state=F_CR;
						break;
					case P_VALUE:
						*tmp=0;
						param->value.len=tmp-param->value.s;
						saved_state=L_PARAM;
						state=F_CR;
						goto endofvalue;
					case F_LF:
					case F_CR:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", *tmp, state);
						goto error;
				}
				break;

			case '=':
				switch(state){
					case L_VALUE:
						state=F_VALUE;
						break;
					case P_STRING:
						break;
					case F_LF:
					case F_CR:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", *tmp, state);
						goto error;
				}
				break;
			case ';':
				switch(state){
					case P_VALUE:
						*tmp=0;
						param->value.len=tmp-param->value.s;
						state=F_PARAM;
						goto endofvalue;
					case P_STRING:
						break; /* what to do? */
					case F_LF:
					case F_CR:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", *tmp, state);
						goto error;
				}
				break;
			case ',':
				switch(state){
					case P_VALUE:
						*tmp=0;
						param->value.len=tmp-param->value.s;
						state=F_VIA;
						goto endofvalue;
					case P_STRING:
						case F_LF:
					case F_CR:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", *tmp, state);
						goto error;
				}
				break; /* what to do? */
			case '"':
				switch(state){
					case F_VALUE:
						state=P_STRING;
						param->value.s=tmp+1;
						break;
					case P_STRING:
						*tmp=0;
						state=L_PARAM;
						param->value.len=tmp-param->value.s;
						goto endofvalue;
					case F_LF:
					case F_CR:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", *tmp, state);
						goto error;
				}
				break;
			default:
				switch(state){
					case F_VALUE:
						state=P_VALUE;
						param->value.s=tmp;
						break;
					case P_VALUE:
					case P_STRING:
						break;
					case F_LF:
					case F_CR:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end_via;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", *tmp, state);
						goto error;
				}
		}
	} /* for2 tmp*/

	/* end of buff and no CR/LF =>error*/
	saved_state=state;
	state=END_OF_HEADER;
	goto error;
	
 endofparam:
 endofvalue:
	param->size=tmp-p;
	*pstate=state;
	*psaved_state=saved_state;
	DBG("Found param type %d, <%s> = <%s>; state=%d\n", param->type,
			param->name.s, param->value.s, state);
	return tmp;
	
 end_via:
	     /* if we are here we found an "unexpected" end of via
	      *  (cr/lf). This is valid only if the param type is GEN_PARAM*/
	if (param->type==GEN_PARAM){
		saved_state=L_PARAM; /* change the saved_state, we have an unknown
		                        param. w/o a value */
		goto endofparam;
	}
	*pstate=state;
	*psaved_state=saved_state;
	DBG("Error on  param type %d, <%s>, state=%d, saved_state=%d\n",
		param->type, param->name.s, state, saved_state);

 error:
	LOG(L_ERR, "error: parse_via_param\n");
	param->type=PARAM_ERROR;
	*pstate=PARAM_ERROR;
	*psaved_state=state;
	return tmp;
}



char* parse_via(char* buffer, char* end, struct via_body *vb)
{
	char* tmp;
	unsigned char state;
	unsigned char saved_state;
	int c_nest;
	int err;

	struct via_param* param;

parse_again:
	vb->error=PARSE_ERROR;
	/* parse start of via ( SIP/2.0/UDP    )*/
	state=F_SIP;
	for(tmp=buffer;tmp<end;tmp++){
		switch(*tmp){
			case ' ':
			case'\t':
				switch(state){
					case L_VER: /* eat space */
					case L_PROTO:
					case F_SIP:
					case F_VER:
					case F_PROTO:
						break;
					case FIN_UDP:
						*tmp=0;  /* finished proto parsing */
						vb->transport.len=tmp-vb->transport.s;
						vb->proto=PROTO_UDP;
						state=F_HOST; /* start looking for host*/
						goto main_via;
					case FIN_TCP:
						*tmp=0;  /* finished proto parsing */
						vb->transport.len=tmp-vb->transport.s;
						vb->proto=PROTO_TCP;
						state=F_HOST; /* start looking for host*/
						goto main_via;
					case FIN_SIP:
						*tmp=0;
						vb->name.len=tmp-vb->name.s;
						state=L_VER;
						break;
					case FIN_VER:
						*tmp=0;
						vb->version.len=tmp-vb->version.s;
						state=L_PROTO;
						break;
					case F_LF:
					case F_CRLF:
					case F_CR: /* header continues on this line */
						state=saved_state;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			case '\n':
				switch(state){
					case L_VER:
					case F_SIP:
					case F_VER:
					case F_PROTO:
					case L_PROTO:
						saved_state=state;
						state=F_LF;
						break;
					case FIN_UDP:
						*tmp=0;
						vb->transport.len=tmp-vb->transport.s;
						vb->proto=PROTO_UDP;
						state=F_LF;
						saved_state=F_HOST; /* start looking for host*/
						goto main_via;
					case FIN_TCP:
						*tmp=0;
						vb->transport.len=tmp-vb->transport.s;
						vb->proto=PROTO_TCP;
						state=F_LF;
						saved_state=F_HOST; /* start looking for host*/
						goto main_via;
					case FIN_SIP:
						*tmp=0;
						vb->name.len=tmp-vb->name.s;
						state=F_LF;
						saved_state=L_VER;
						break;
					case FIN_VER:
						*tmp=0;
						vb->version.len=tmp-vb->version.s;
						state=F_LF;
						saved_state=L_PROTO;
						break;
					case F_CR:
						state=F_CRLF;
						break;
					case F_LF:
					case F_CRLF:
						state=saved_state;
						goto endofheader;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			case '\r':
				switch(state){
					case L_VER:
					case F_SIP:
					case F_VER:
					case F_PROTO:
					case L_PROTO:
						saved_state=state;
						state=F_CR;
						break;
					case FIN_UDP:
						*tmp=0;
						vb->transport.len=tmp-vb->transport.s;
						vb->proto=PROTO_UDP;
						state=F_CR;
						saved_state=F_HOST;
						goto main_via;
					case FIN_TCP:
						*tmp=0;
						vb->transport.len=tmp-vb->transport.s;
						vb->proto=PROTO_TCP;
						state=F_CR;
						saved_state=F_HOST;
						goto main_via;
					case FIN_SIP:
						*tmp=0;
						vb->name.len=tmp-vb->name.s;
						state=F_CR;
						saved_state=L_VER;
						break;
					case FIN_VER:
						*tmp=0;
						vb->version.len=tmp-vb->version.s;
						state=F_CR;
						saved_state=L_PROTO;
						break;
					case F_LF: /*end of line ?next header?*/
					case F_CR:
					case F_CRLF:
						state=saved_state;
						goto endofheader;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			
			case '/':
				switch(state){
					case FIN_SIP:
						*tmp=0;
						vb->name.len=tmp-vb->name.s;
						state=F_VER;
						break;
					case FIN_VER:
						*tmp=0;
						vb->version.len=tmp-vb->version.s;
						state=F_PROTO;
						break;
					case L_VER:
						state=F_VER;
						break;
					case L_PROTO:
						state=F_PROTO;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
				/* match SIP*/
			case 'S':
			case 's':
				switch(state){
					case F_SIP:
						state=SIP1;
						vb->name.s=tmp;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			case 'I':
			case 'i':
				switch(state){
					case SIP1:
						state=SIP2;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			case 'p':
			case 'P':
				switch(state){
					case SIP2:
						state=FIN_SIP;
						break;
					/* allow p in PROTO */
					case UDP2:
						state=FIN_UDP;
						break;
					case TCP2:
						state=FIN_TCP;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			case 'U':
			case 'u':
				switch(state){
					case F_PROTO:
						state=UDP1;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			case 'D':
			case 'd':
				switch(state){
					case UDP1:
						state=UDP2;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			case 'T':
			case 't':
				switch(state){
					case F_PROTO:
						state=TCP1;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			case 'C':
			case 'c':
				switch(state){
					case TCP1:
						state=TCP2;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			/*match 2.0*/
			case '2':
				switch(state){
					case F_VER:
						state=VER1;
						vb->version.s=tmp;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			case '.':
				switch(state){
					case VER1:
						state=VER2;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				 break;
			case '0':
				switch(state){
					case VER2:
						state=FIN_VER;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			
			default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				break;
		}
	} /* for tmp*/

	/* we should not be here! if everything is ok > main_via*/
	LOG(L_ERR, "ERROR: parse_via: bad via: end of packet on state=%d\n",
			state);
	goto error;

 main_via:
	/* inc tmp to point to the next char*/
	tmp++;
	c_nest=0;
	/*state should always be F_HOST here*/;
	for(;*tmp;tmp++){
		switch(*tmp){
		case ' ':
		case '\t':
			switch(state){
					case F_HOST:/*eat the spaces*/
						break;
					case P_HOST:
						 *tmp=0;/*mark end of host*/
						 vb->host.len=tmp-vb->host.s;
						 state=L_PORT;
						 break;
					case L_PORT: /*eat the spaces*/
					case F_PORT:
						break;
					case P_PORT:
						*tmp=0; /*end of port */
						vb->port_str.len=tmp-vb->port_str.s;
						state=L_PARAM;
						break;
					case L_PARAM: /* eat the space */
					case F_PARAM:
						break;
					case P_PARAM:
					/*	*tmp=0;*/ /*!?end of param*/
						state=L_PARAM;
						break;
					case L_VIA:
					case F_VIA: /* eat the space */
						break;
					case F_COMMENT:
					case P_COMMENT:
						break;
					case F_IP6HOST: /*eat the spaces*/
						break;
					case P_IP6HOST:
						*tmp=0; /*mark end of host*/
						vb->host.len=tmp-vb->host.s;
						state=L_PORT; 
						break;
					case F_CRLF:
					case F_LF:
					case F_CR:
						/*previous=crlf and now =' '*/
						state=saved_state;
						break;
					default:
						LOG(L_CRIT,"BUG: parse_via"
							" on <%c>, state=%d\n",*tmp, state);
						goto  error;
				}
			break;
			case '\n':
				switch(state){
					case F_HOST:/*eat the spaces*/
					case L_PORT: /*eat the spaces*/
					case F_PORT:
					case L_PARAM: /* eat the space */
					case F_PARAM:
					case F_VIA: /* eat the space */
					case L_VIA:
					case F_COMMENT:
					case P_COMMENT:
					case F_IP6HOST:
					case P_IP6HOST:
						saved_state=state;
						state=F_LF;
						break;
					case P_HOST:
						 *tmp=0;/*mark end of host*/
						 vb->host.len=tmp-vb->host.s;
						 saved_state=L_PORT;
						 state=F_LF;
						 break;
					case P_PORT:
						*tmp=0; /*end of port */
						vb->port_str.len=tmp-vb->port_str.s;
						saved_state=L_PARAM;
						state=F_LF;
						break;
					case P_PARAM:
					/*	*tmp=0;*/ /*!?end of param*/
						saved_state=L_PARAM;
						state=F_LF;
						break;
					case F_CR:
						state=F_CRLF;
						break;
					case F_CRLF:
					case F_LF:
						state=saved_state;
						goto endofheader;
					default:
						LOG(L_CRIT,"BUG: parse_via"
							" on <%c>\n",*tmp);
						goto  error;
				}
			break;
		case '\r':
				switch(state){
					case F_HOST:/*eat the spaces*/
					case L_PORT: /*eat the spaces*/
					case F_PORT:
					case L_PARAM: /* eat the space */
					case F_PARAM:
					case F_VIA: /* eat the space */
					case L_VIA:
					case F_COMMENT:
					case P_COMMENT:
					case F_IP6HOST:
					case P_IP6HOST:
						saved_state=state;
						state=F_CR;
						break;
					case P_HOST:
						 *tmp=0;/*mark end of host*/
						 vb->host.len=tmp-vb->host.s;
						 saved_state=L_PORT;
						 state=F_CR;
						 break;
					case P_PORT:
						*tmp=0; /*end of port */
						vb->port_str.len=tmp-vb->port_str.s;
						saved_state=L_PARAM;
						state=F_CR;
						break;
					case P_PARAM:
					/*	*tmp=0;*/ /*!?end of param*/
						saved_state=L_PARAM;
						state=F_CR;
						break;
					case F_CRLF:
					case F_CR:
					case F_LF:
						state=saved_state;
						goto endofheader;
					default:
						LOG(L_CRIT,"BUG: parse_via"
							" on <%c>\n",*tmp);
						goto  error;
				}
			break;
			
			case ':':
				switch(state){
					case F_HOST:
					case F_IP6HOST:
						LOG(L_ERR,"ERROR:parse_via:"
							" no host found\n");
						goto error;
					case P_IP6HOST:
						break;
					case P_HOST:
						*tmp=0; /*mark  end of host*/
						vb->host.len=tmp-vb->host.s;
						state=F_PORT;
						break;
					case L_PORT:
						state=F_PORT;
						break;
					case P_PORT:
						LOG(L_ERR, "ERROR:parse_via:"
							" bad port\n");
						goto error;
					case L_PARAM:
					case F_PARAM:
					case P_PARAM:
						LOG(L_ERR, "ERROR:parse_via:"
						" bad char <%c> in state %d\n",
							*tmp,state);
						goto error;
					case L_VIA:
					case F_VIA:
						LOG(L_ERR, "ERROR:parse_via:"
						" bad char in compact via\n");
						goto error;
					case F_CRLF:
					case F_LF:
					case F_CR:
						/*previous=crlf and now !=' '*/
						goto endofheader;
					case F_COMMENT:/*everything is allowed in a comment*/
						vb->comment.s=tmp;
						state=P_COMMENT;
						break;
					case P_COMMENT: /*everything is allowed in a comment*/
						break;
					default:
						LOG(L_CRIT,"BUG: parse_via"
							" on <%c> state %d\n",
							*tmp, state);
						goto error;
				}
				break;
			case ';':
				switch(state){
					case F_HOST:
					case F_IP6HOST:
						LOG(L_ERR,"ERROR:parse_via:"
							" no host found\n");
						goto error;
					case P_IP6HOST:
						LOG(L_ERR, "ERROR:parse_via: bad ipv6 reference\n");
						goto error;
					case P_HOST:
						*tmp=0;
						vb->host.len=tmp-vb->host.s;
						state=F_PARAM;
						break;
					case P_PORT:
						*tmp=0; /*mark the end*/
						vb->port_str.len=tmp-vb->port_str.s;
					case L_PORT:
					case L_PARAM:
						state=F_PARAM;
						break;
					case F_PORT:
						LOG(L_ERR, "ERROR:parse_via:"
						" bad char <%c> in state %d\n",
							*tmp,state);
						goto error;
					case F_PARAM:
						LOG(L_ERR,  "ERROR:parse_via:"
							" null param?\n");
						goto error;
					case P_PARAM:
						/*hmm next, param?*/
						state=F_PARAM;
						break;
					case L_VIA:
					case F_VIA:
						LOG(L_ERR, "ERROR:parse_via:"
						" bad char <%c> in next via\n",
							*tmp);
						goto error;
					case F_CRLF:
					case F_LF:
					case F_CR:
						/*previous=crlf and now !=' '*/
						goto endofheader;
					case F_COMMENT:/*everything is allowed in a comment*/
						vb->comment.s=tmp;
						state=P_COMMENT;
						break;
					case P_COMMENT: /*everything is allowed in a comment*/
						break;
					
					default:
						LOG(L_CRIT,"BUG: parse_via"
							" on <%c> state %d\n",
							*tmp, state);
						goto  error;
				}
			break;
			case ',':
				switch(state){
					case F_HOST:
					case F_IP6HOST:
						LOG(L_ERR,"ERROR:parse_via:"
							" no host found\n");
						goto error;
					case P_IP6HOST:
						LOG(L_ERR, "ERROR:parse_via: bad ipv6 reference\n");
						goto error;
					case P_HOST:
						*tmp=0; /*mark the end*/
						vb->host.len=tmp-vb->host.s;
						state=F_VIA;
						break;
					case P_PORT:
						*tmp=0; /*mark the end*/
						vb->port_str.len=tmp-vb->port_str.s;
						state=F_VIA;
						break;
					case L_PORT:
					case L_PARAM:
					case P_PARAM:
					case L_VIA:
						state=F_VIA;
						break;
					case F_PORT:
					case F_PARAM:
						LOG(L_ERR, "ERROR:parse_via:"
						" invalid char <%c> in state"
						" %d\n", *tmp,state);
						goto error;
					case F_VIA:
						/* do  nothing,  eat ","*/
						break;	
					case F_CRLF:
					case F_LF:
					case F_CR:
						/*previous=crlf and now !=' '*/
						goto endofheader;
					case F_COMMENT:/*everything is allowed in a comment*/
						vb->comment.s=tmp;
						state=P_COMMENT;
						break;
					case P_COMMENT: /*everything is allowed in a comment*/
						break;
					default:
						LOG(L_CRIT,"BUG: parse_via"
							" on <%c> state %d\n",
							*tmp, state);
						goto  error;
				}
			break;
			case '(':
				switch(state){
					case F_HOST:
					case F_PORT:
					case F_PARAM:
					case F_VIA:
					case F_IP6HOST:
					case P_IP6HOST: /*must be terminated in ']'*/
						LOG(L_ERR,"ERROR:parse_via"
							" on <%c> state %d\n",
							*tmp, state);
						goto  error;
					case P_HOST:
						*tmp=0; /*mark the end*/
						vb->host.len=tmp-vb->host.s;
						state=F_COMMENT;
						c_nest++;
						break;
					case P_PORT:
						*tmp=0; /*mark the end*/
						vb->port_str.len=tmp-vb->port_str.s;
						state=F_COMMENT;
						c_nest++;
						break;
					case P_PARAM:
						*tmp=0; /*mark the end*/
						vb->params.len=tmp-vb->params.s;
						state=F_COMMENT;
						c_nest++;
						break;
					case L_PORT:
					case L_PARAM:
					case L_VIA:
						state=F_COMMENT;
						vb->params.len=tmp-vb->params.s;
						c_nest++;
						*tmp=0;
						break;
					case P_COMMENT:
					case F_COMMENT:
						c_nest++;
						break;
					case F_CRLF:
					case F_LF:
					case F_CR:
						/*previous=crlf and now !=' '*/
						goto endofheader;
					default:
						LOG(L_CRIT,"BUG: parse_via"
							" on <%c> state %d\n",
							*tmp, state);
						goto  error;
				}
			break;
			case ')':
				switch(state){
					case F_COMMENT:
					case P_COMMENT:
						if (c_nest){
							c_nest--;
							if(c_nest==0){
								state=L_VIA;
								*tmp=0;
								vb->comment.len=tmp-vb->comment.s;
								break;
							}
						}else{
							LOG(L_ERR,"ERROR:"
							    "parse_via: "
							    "missing '(' - "
							    "nesting = %d\n",
							    c_nest);
							 goto error;
						}
						break;
					case F_HOST:
					case F_PORT:
					case F_PARAM:
					case F_VIA:
					case P_HOST:
					case P_PORT:
					case P_PARAM:
					case L_PORT:
					case L_PARAM:
					case L_VIA:
					case F_IP6HOST:
					case P_IP6HOST:
						LOG(L_ERR,"ERROR:parse_via"
							" on <%c> state %d\n",
							*tmp, state);
						goto  error;
					case F_CRLF:
					case F_LF:
					case F_CR:
						/*previous=crlf and now !=' '*/
						goto endofheader;
					default:
						LOG(L_CRIT,"BUG: parse_via"
							" on <%c> state %d\n",
							*tmp, state);
						goto  error;
				}
				break;
			case '[':
				switch(state){
					case F_HOST:
						state=F_IP6HOST;
						break;
					case F_COMMENT:/*everything is allowed in a comment*/
						vb->comment.s=tmp;
						state=P_COMMENT;
						break;
					case P_COMMENT:
						break;
					case F_CRLF:
					case F_LF:
					case F_CR:
						/*previous=crlf and now !=' '*/
						goto endofheader;
					default:
						LOG(L_ERR,"ERROR:parse_via"
							" on <%c> state %d\n",
							*tmp, state);
						goto  error;
				}
				break;
			case ']':
				switch(state){
					case P_IP6HOST:
						*tmp=0; /*mark the end*/
						vb->host.len=tmp-vb->host.s;
						state=L_PORT;
						break;
					case F_CRLF:
					case F_LF:
					case F_CR:
						/*previous=crlf and now !=' '*/
						goto endofheader;
					case F_COMMENT:/*everything is allowed in a comment*/
						vb->comment.s=tmp;
						state=P_COMMENT;
						break;
					case P_COMMENT:
						break;
					default:
						LOG(L_ERR,"ERROR:parse_via"
							" on <%c> state %d\n",
							*tmp, state);
						goto  error;
				}
				break;
						
			default:
				switch(state){
					case F_HOST:
						state=P_HOST;
						vb->host.s=tmp;
						break;
					case P_HOST:
						break;
					case F_PORT:
						state=P_PORT;
						vb->port_str.s=tmp;
						break;
					case P_PORT:
						/*check if number?*/
						break;
					case F_PARAM:
						/*state=P_PARAM*/;
						if(vb->params.s==0) vb->params.s=tmp;
						param=pkg_malloc(sizeof(struct via_param));
						if (param==0){
							LOG(L_ERR, "ERROR:parse_via: mem. allocation"
									" error\n");
							goto error;
						}
						memset(param,0, sizeof(struct via_param));
						tmp=parse_via_param(tmp, end, &state, &saved_state,
											param);

						switch(state){
							case L_PARAM:
							case F_PARAM:
							case F_LF:
							case F_CR:
								break;
							case F_VIA:
								vb->params.len=tmp-vb->params.s;
								*tmp=0;
								break;
							case END_OF_HEADER:
								vb->params.len=tmp-vb->params.s;
								state=saved_state;
								goto endofheader;
							case PARAM_ERROR:
								pkg_free(param);
								goto error;
							default:
								LOG(L_ERR, "ERROR: parse_via after"
										" parse_via_param: invalid"
										" char <%c> on state %d\n",
										*tmp, state);
								goto error;
						}
						/*add param to the list*/
						if (vb->last_param)	vb->last_param->next=param;
						else				vb->param_lst=param;
						vb->last_param=param;
						if (param->type==PARAM_BRANCH)
							vb->branch=param;
						else if (param->type==PARAM_RECEIVED)
							vb->received=param;
						break;
					case P_PARAM:
						break;
					case F_VIA:
						/*vb->next=tmp;*/ /*???*/
						goto nextvia;
					case L_PORT:
					case L_PARAM:
					case L_VIA:
						LOG(L_ERR,"ERROR:parse_via"
							" on <%c> state %d (default)\n",
							*tmp, state);
						goto  error;
					case F_COMMENT:
						state=P_COMMENT;
						vb->comment.s=tmp;
						break;
					case P_COMMENT:
						break;
					case F_IP6HOST:
						state=P_IP6HOST;
						vb->host.s=tmp;
						break;
					case P_IP6HOST:
						break;
					case F_CRLF:
					case F_LF:
					case F_CR:
						/*previous=crlf and now !=' '*/
						goto endofheader;
					default:
						LOG(L_ERR, "BUG:parse_via:"
							" invalid char <%c>"
							" in state %d\n",
							*tmp, state);
						goto error;
				}


		}
	}

	DBG("end of packet reached, state=%d\n", state);
	goto endofpacket; /*end of packet, probably should be goto error*/
	
endofheader:
	state=saved_state;
	DBG("end of header reached, state=%d\n", state);
endofpacket:
	/* check if error*/
	switch(state){
		case P_HOST:
		case L_PORT:
		case P_PORT:
		case L_PARAM:
		case P_PARAM:
		case P_VALUE:
		case GEN_PARAM:
		case FIN_HIDDEN:
		case L_VIA:
			break;
		default:
			LOG(L_ERR, "ERROR: parse_via: invalid via - end of header in"
					" state %d\n", state);
			goto error;
	}


	/*
	if (proto) printf("<SIP/2.0/%s>\n", proto);
	if (host) printf("host= <%s>\n", host);
	if (port_str) printf("port= <%s>\n", port_str);
	if (param) printf("params= <%s>\n", param);
	if (comment) printf("comment= <%s>\n", comment);
	if(next_via) printf("next_via= <%s>\n", next_via);
	*/
	/*DBG("parse_via: rest=<%s>\n", tmp);*/

	vb->error=PARSE_OK;
	vb->bsize=tmp-buffer;
	if (vb->port_str.s){
		vb->port=str2s((unsigned char*)vb->port_str.s, vb->port_str.len, &err);
		if (err){
					LOG(L_ERR, "ERROR: parse_via: invalid port number <%s>\n",
						vb->port_str.s);
					goto error;
		}
	}
	return tmp;
nextvia:
	DBG("parse_via: next_via\n");
	vb->error=PARSE_OK;
	vb->bsize=tmp-buffer;
	if (vb->port_str.s){
		vb->port=str2s((unsigned char*)vb->port_str.s, vb->port_str.len, &err);
		if (err){
					LOG(L_ERR, "ERROR: parse_via: invalid port number <%s>\n",
						vb->port_str.s);
					goto error;
		}
	}
	vb->next=pkg_malloc(sizeof(struct via_body));
	if (vb->next==0){
		LOG(L_ERR, "ERROR: parse_via: out of memory\n");
		goto error;
	}
	vb=vb->next;
	memset(vb, 0, sizeof(struct via_body));
	buffer=tmp;
	goto parse_again;

error:
	if (end>buffer){
		LOG(L_ERR, "ERROR: parse_via on: <%.*s>\n", (int)(end-buffer), buffer);
	}
	if ((tmp>buffer)&&(tmp<end)){
		LOG(L_ERR, "ERROR: parse_via parse error, parsed so far:<%.*s>\n",
				(int)(tmp-buffer), buffer );
	}else{
		LOG(L_ERR, "ERROR: parse_via: via parse error\n");
	}
	vb->error=PARSE_ERROR;
	return tmp;
}


static inline void free_via_param_list(struct via_param* vp)
{
	struct via_param* foo;
	while(vp){
		foo=vp;
		vp=vp->next;
		pkg_free(foo);
	}
}


void free_via_list(struct via_body* vb)
{
	struct via_body* foo;
	while(vb){
		foo=vb;
		vb=vb->next;
		if (foo->param_lst) free_via_param_list(foo->param_lst);
		pkg_free(foo);
	}
}