kamailio/test/via_parse.c

/* test program -> via parse */
/*
 *
 * 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:
 *    [email protected]
 *
 * 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:
 *  - parse next via
 *  - return a list of header structs
 *  - '[' ']' ipv6 parsing!
 *  - return list of params
 *  - test ^\s...'
 *  - add support for parsing via front (SIP/2.0/UDP)
 */

#include <stdio.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,
		L_PROTO, F_PROTO, P_PROTO
	};

/* param realated states */
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, FIN_TTL, FIN_BRANCH, FIN_MADDR, FIN_RECEIVED,
		GEN_PARAM
	};

#define LOG(lev, fmt, args...) fprintf(stderr, fmt, ## args)


/* 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 */
__inline char* parse_via_param(char* p, int* pstate, int* psaved_state)
{
	char* tmp;
	register int state;
	int saved_state;
	int param_type;
	char* param_name;
	char* param_value;
	
	state=*pstate;
	saved_state=*psaved_state;
	param_name=param_value=0;
	param_type=0;
	
	for (tmp=p;*tmp;tmp++){
		switch(*tmp){
			case ' ':
			case '\t':
				switch(state){
					case FIN_HIDDEN:
						*tmp=0;
						param_type=state;
						state=L_PARAM;
						goto endofparam;
					case FIN_BRANCH:
					case FIN_TTL:
					case FIN_MADDR:
					case FIN_RECEIVED:
						*tmp=0;
						param_type=state;
						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;
						state=L_VALUE;
						goto find_value;
				}
				break;
			/* \n and \r*/
			case '\n':
				switch(state){
					case FIN_HIDDEN:
						*tmp=0;
						param_type=state;
						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;
						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;
					case F_CR:
						state=F_CRLF;
						break;
					case GEN_PARAM:
					default:
						*tmp=0;
						param_type=GEN_PARAM;
						saved_state=L_VALUE;
						state=F_LF;
						goto find_value;
				}
				break;
			case '\r':
				switch(state){
					case FIN_HIDDEN:
						*tmp=0;
						param_type=state;
						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;
						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;
					case GEN_PARAM:
					default:
						*tmp=0;
						param_type=GEN_PARAM;
						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;
						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");
						goto error;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end;
					case GEN_PARAM:
					default:
						*tmp=0;
						param_type=GEN_PARAM;
						state=F_VALUE;
						goto find_value;
				}
				break;
			case ';':
				switch(state){
					case FIN_HIDDEN:
						*tmp=0;
						param_type=state;
						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");
						goto error;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end;
					case GEN_PARAM:
					default:
						*tmp=0;
						param_type=GEN_PARAM;
						state=F_PARAM;
						goto endofparam;
				}
				break;
				
				/* param names */
			case 'h':
			case 'H':
				switch(state){
					case F_PARAM:
						state=HIDDEN1;
						param_name=tmp;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'i':
			case 'I':
				switch(state){
					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;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'd':
			case 'D':
				switch(state){
					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;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'e':
			case 'E':
				switch(state){
					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;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'n':
			case 'N':
				switch(state){
					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;
					default:
						state=GEN_PARAM;
				}
				break;
			case 't':
			case 'T':
				switch(state){
					case F_PARAM:
						state=TTL1;
						param_name=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;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'l':
			case 'L':
				switch(state){
					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;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'm':
			case 'M':
				switch(state){
					case F_PARAM:
						state=MADDR1;
						param_name=tmp;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'a':
			case 'A':
				switch(state){
					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;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'r':
			case 'R':
				switch(state){
					case MADDR4:
						state=FIN_MADDR;
						break;
					case F_PARAM:
						state=RECEIVED1;
						param_name=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;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'c':
			case 'C':
				switch(state){
					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;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'v':
			case 'V':
				switch(state){
					case RECEIVED5:
						state=RECEIVED6;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end;
					default:
						state=GEN_PARAM;
				}
				break;
			case 'b':
			case 'B':
				switch(state){
					case F_PARAM:
						state=BRANCH1;
						param_name=tmp;
						break;
					case GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end;
					default:
						state=GEN_PARAM;
				}
				break;

			default:
				switch(state){
					case F_PARAM:
						state=GEN_PARAM;
						param_name=tmp;
						break;
					case  GEN_PARAM:
						break;
					case F_CR:
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end;
					default:
						state=GEN_PARAM;
				}
		}
	}/* for tmp*/

/* end of packet?*/
saved_state=state;
param_type=state;
state=END_OF_HEADER;
goto end;

find_value:
	tmp++;
	for(tmp;*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;
						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", 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;
						goto endofvalue;
					case F_LF:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end;
					case F_CR:
						state=F_CRLF;
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", 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;
						saved_state=L_PARAM;
						state=F_CR;
						goto endofvalue;
					case F_LF:
					case F_CR:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", 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;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", state);
						goto error;
				}
				break;
			case ';':
				switch(state){
					case P_VALUE:
						*tmp=0;
						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;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", state);
						goto error;
				}
				break;
			
			case '"':
				switch(state){
					case F_VALUE:
						state=P_STRING;
						param_value=tmp+1;
						break;
					case P_STRING:
						*tmp=0;
						state=L_PARAM;
						goto endofvalue;
					case F_LF:
					case F_CR:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", state);
						goto error;
				}
				break;
			default:
				switch(state){
					case F_VALUE:
						state=P_VALUE;
						param_value=tmp;
						break;
					case P_VALUE:
					case P_STRING:
						break;
					case F_LF:
					case F_CR:
					case F_CRLF:
						state=END_OF_HEADER;
						goto end;
					default:
						LOG(L_ERR, "ERROR: parse_via: invalid char <%c>"
								" in state %d\n", state);
						goto error;
				}
		}
	} /* for2 tmp*/

	/* if generic_param => it can have no value */
	if ((state==L_VALUE)&&(param_type==GEN_PARAM)) state=L_PARAM;
	saved_state=state;
	state=END_OF_HEADER;
	goto end;

endofparam:
endofvalue:
	printf("end, tmp=%x, <%c>\n", tmp, *tmp);
	//tmp++;
end:
	*pstate=state;
	*psaved_state=saved_state;
	printf("Found param type %d, <%s> = <%s>\n", param_type, param_name,
			param_value);
	return tmp;

error:
	fprintf(stderr,"error: via_parse_param\n");
	*pstate=state;
	*psaved_state=saved_state;
	return tmp;
}






int main(int argc, char** argv)
{

	char* tmp;
	int state;
	int saved_state;
	int c_nest;
	int i;
	int port;
	char* host;
	char* port_str;
	char* param;
	char* comment;
	char* next_via;
	char *proto; /* in fact transport*/

	host=port_str=param=comment=next_via=proto=0;

	printf(" %s (%d)\n", argv[0], argc);
	if (argc<2){
			fprintf(stderr, " no parameters\n");
			exit(-1);
	}
	
	/* parse start of via ( SIP/2.0/UDP    )*/
	state=F_SIP;
	for(tmp=argv[1];*tmp;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 P_PROTO:
						*tmp=0;  /* finished proto parsing */
						state=F_HOST; /* start looking for host*/
						goto main_via;
					case FIN_SIP:
						*tmp=0;
						state=L_VER;
						break;
					case FIN_VER:
						*tmp=0;
						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 P_PROTO:
						*tmp=0;
						state=F_LF;
						saved_state=F_HOST; /* start looking for host*/
						goto main_via;
					case FIN_SIP:
						*tmp=0;
						state=F_LF;
						saved_state=L_VER;
						break;
					case FIN_VER:
						*tmp=0;
						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 P_PROTO:
						*tmp=0;
						state=F_CR;
						saved_state=F_HOST;
						goto main_via;
					case FIN_SIP:
						*tmp=0;
						state=F_CR;
						saved_state=L_VER;
						break;
					case FIN_VER:
						*tmp=0;
						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;
						state=F_VER;
						break;
					case FIN_VER:
						*tmp=0;
						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;
						break;
					/* allow S in PROTO */
					case F_PROTO:
						proto=tmp;
						state=P_PROTO;
						break;
					case P_PROTO:
						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;
					/* allow i in PROTO */
					case F_PROTO:
						proto=tmp;
						state=P_PROTO;
						break;
					case P_PROTO:
						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 F_PROTO:
						proto=tmp;
						state=P_PROTO;
						break;
					case P_PROTO:
						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;
						break;
					/* allow 2 in PROTO*/
					case F_PROTO:
						proto=tmp;
						state=P_PROTO;
						break;
					case P_PROTO:
						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;
					/* allow . in PROTO */
					case F_PROTO:
						proto=tmp;
						state=P_PROTO;
						break;
					case P_PROTO:
						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;
					/* allow 0 in PROTO*/
					case F_PROTO:
						proto=tmp;
						state=P_PROTO;
						break;
					case P_PROTO:
						break;
					default:
						LOG(L_ERR, "ERROR: parse_via: bad char <%c> on"
								" state %d\n", *tmp, state);
						goto error;
				}
				break;
			
			default:
				switch(state){
					case F_PROTO:
						proto=tmp;
						state=P_PROTO;
						break;
					case P_PROTO:
						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*/
						 state=L_PORT;
						 break;
					case L_PORT: /*eat the spaces*/
					case F_PORT:
						break;
					case P_PORT:
						*tmp=0; /*end of port */
						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*/
						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*/
						 saved_state=L_PORT;
						 state=F_LF;
						 break;
					case P_PORT:
						*tmp=0; /*end of port */
						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*/
						 saved_state=L_PORT;
						 state=F_CR;
						 break;
					case P_PORT:
						*tmp=0; /*end of port */
						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:
						LOG(L_ERR, "ERROR:parse_via: bad ipv6 reference\n");
						goto error;
					case P_HOST:
						*tmp=0; /*mark  end of host*/
						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*/
						comment=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:
					case P_PORT:
						*tmp=0; /*mark the end*/
					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*/
						comment=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:
					case P_PORT:
						*tmp=0; /*mark the end*/
					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*/
						comment=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(_ERR,"ERROR:parse_via"
							" on <%c> state %d\n",
							*tmp, state);
						goto  error;
					case P_HOST:
					case P_PORT:
					case P_PARAM:
						*tmp=0; /*mark the end*/
					case L_PORT:
					case L_PARAM:
					case L_VIA:
						state=F_COMMENT;
						c_nest++;
						printf("found '(', state=%d, c_nest=%d\n",
								state, 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;
								printf("out of comment\n");
								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*/
						comment=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*/
						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*/
						comment=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;
						host=tmp;
						break;
					case P_HOST:
						break;
					case F_PORT:
						state=P_PORT;
						port_str=tmp;
						break;
					case P_PORT:
						/*check if number?*/
						break;
					case F_PARAM:
						/*state=P_PARAM*/;
						param=tmp;
						tmp=parse_via_param(tmp, &state, &saved_state);
						switch(state){
							case L_PARAM:
							case F_PARAM:
							case F_LF:
							case F_CR:
								break;
							case END_OF_HEADER:
								state=saved_state;
								goto endofheader;
							default:
								LOG(L_ERR, "ERROR: parse_via after"
										" parse_via_param: invalid"
										" char <%c> on state %d\n",
										*tmp, state);
								goto error;
						}
						break;
					case P_PARAM:
						break;
					case F_VIA:
						next_via=tmp;
						printf("found new via on <%c>\n", *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:
						printf("starting comment parsing on %c \n",*tmp);
						state=P_COMMENT;
						comment=tmp;
						break;
					case P_COMMENT:
						break;
					case F_IP6HOST:
						state=P_IP6HOST;
						host=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;
				}
				
					
		}			
	}

	printf("end of packet reached, state=%d\n", state);
	goto endofpacket; /*end of packet, probably should be goto error*/
	
endofheader:
	state=saved_state;
	printf("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;
	}
		
nextvia:
	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);
	printf("rest=<%s>\n", tmp);
	
	exit(0);

error:
	fprintf(stderr, "via parse error\n");
	exit(-1);
}