/src/opensips/parser/parse_via.c

Source
/*
 * via parsing automaton
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of opensips, a free SIP server.
 *
 * opensips 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
 *
 * opensips 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
 */



/*
 *  2003-01-21  added rport parsing code, contributed by
 *               Maxim Sobolev  <sobomax@FreeBSD.org>
 *  2003-01-23  added extra via param parsing code (i=...), used
 *               by tcp to identify the sending socket, by andrei
 *  2003-01-23  fixed rport parsing code to accept rport w/o any value,
 *               by andrei
 *  2003-01-27  modified parse_via to set new via_param->start member and
 *               via->params.s (andrei)
 *  2003-01-28  zero-terminations replaced with VIA_ZT (jiri)
 *  2003-02-28  scratchpad compatibility abandoned (jiri)
 *  2003-04-26  ZSW (jiri)
 *  2003-06-23  fixed  parse_via_param [op].* param. parsing bug (andrei)
 *  2003-07-02  added support for TLS parsing in via (andrei)
 *  2003-10-27  added support for alias via param parsing [see
 *               draft-ietf-sip-connect-reuse-00.txt.]  (andrei)
 *  2004-03-31  fixed rport set instead of i bug (andrei)
 *  2005-03-02  if via has multiple bodies, and one of them is bad set
 *               also the first one as bad (andrei)
 */



#include <stdlib.h>
#include <string.h>
#include "../dprint.h"
#include "../ut.h"
#include "../ip_addr.h"
#include "../mem/mem.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,
  TCP_TLS1, TCP2, FIN_TCP,
  TLS2, FIN_TLS,
  SCTP1, SCTP2, SCTP3, FIN_SCTP,
  WS1, WS_WSS, FIN_WS, FIN_WSS,
  OTHER_PROTO,
  L_PROTO, F_PROTO
};


/* param related states
 * WARNING: keep in sync with parse_via.h, PARAM_HIDDEN, ...
 */
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,
  RPORT1, RPORT2, RPORT3,
  ALIAS1, ALIAS2, ALIAS3, ALIAS4,
       /* fin states (227-...)*/
  FIN_HIDDEN = 230, FIN_TTL, FIN_BRANCH,
  FIN_MADDR, FIN_RECEIVED, FIN_RPORT, FIN_I, FIN_ALIAS
       /*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
 * WARNING: param->start must be filled before, it's used in param->size
 * computation.
 */
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:
          case FIN_ALIAS:
            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:
          case FIN_RPORT:
          case FIN_I:
            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:
            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:
          case FIN_ALIAS:
            param->type=state;
            param->name.len=tmp-param->name.s;
            param->size=tmp-param->start;
            saved_state=L_PARAM;
            state=F_LF;
            goto endofparam;
          case FIN_BRANCH:
          case FIN_TTL:
          case FIN_MADDR:
          case FIN_RECEIVED:
          case FIN_I:
          case FIN_RPORT:
            param->type=state;
            param->name.len=tmp-param->name.s;
            param->size=tmp-param->start;
            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:
            param->type=GEN_PARAM;
            saved_state=L_VALUE;
            param->name.len=tmp-param->name.s;
            param->size=tmp-param->start;
            state=F_LF;
            goto find_value;
        }
        break;
      case '\r':
        switch(state){
          case FIN_HIDDEN:
          case FIN_ALIAS:
            param->type=state;
            param->name.len=tmp-param->name.s;
            param->size=tmp-param->start;
            saved_state=L_PARAM;
            state=F_CR;
            goto endofparam;
          case FIN_BRANCH:
          case FIN_TTL:
          case FIN_MADDR:
          case FIN_RECEIVED:
          case FIN_I:
          case FIN_RPORT:
            param->type=state;
            param->name.len=tmp-param->name.s;
            param->size=tmp-param->start;
            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:
            param->type=GEN_PARAM;
            param->name.len=tmp-param->name.s;
            param->size=tmp-param->start;
            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:
          case FIN_RPORT:
          case FIN_I:
            param->type=state;
            param->name.len=tmp-param->name.s;
            state=F_VALUE;
            goto find_value;
          case F_PARAM:
          case FIN_HIDDEN:
          case FIN_ALIAS:
            LM_ERR("invalid char <%c> in state %d\n", *tmp, state);
            goto parse_error;
          case F_CR:
          case F_LF:
          case F_CRLF:
            state=END_OF_HEADER;
            goto end_via;
          case GEN_PARAM:
          default:
            param->type=GEN_PARAM;
            param->name.len=tmp-param->name.s;
            state=F_VALUE;
            goto find_value;
        }
        break;
      case ';':
        switch(state){
          case FIN_HIDDEN:
          case FIN_RPORT: /* rport can appear w/o a value */
          case FIN_ALIAS:
            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:
          case FIN_I:
            LM_ERR("invalid char <%c> in state %d\n", *tmp, state);
            goto parse_error;
          case F_CR:
          case F_LF:
          case F_CRLF:
            state=END_OF_HEADER;
            goto end_via;
          case GEN_PARAM:
          default:
            param->type=GEN_PARAM;
            param->name.len=tmp-param->name.s;
            state=F_PARAM;
            goto endofparam;
        }
        break;
      case ',':
        switch(state){
          case FIN_HIDDEN:
          case FIN_RPORT:
          case FIN_ALIAS:
            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:
          case FIN_I:
            LM_ERR("new via found (',') when '=' expected"
                "(state %d=)\n", state);
            goto parse_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:
            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=FIN_I;
            param->name.s=tmp;
            break;
          case HIDDEN1:
            state=HIDDEN2;
            break;
          case RECEIVED4:
            state=RECEIVED5;
            break;
          case ALIAS2:
            state=ALIAS3;
            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 RPORT3:
            state=FIN_RPORT;
            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 ALIAS1:
            state=ALIAS2;
            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=ALIAS1;
            param->name.s=tmp;
            break;
          case MADDR1:
            state=MADDR2;
            break;
          case BRANCH2:
            state=BRANCH3;
            break;
          case ALIAS3:
            state=ALIAS4;
            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 RPORT2:
            state=RPORT3;
            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;
      case 'p':
      case 'P':
        switch(state){
          case F_PARAM:
            state=GEN_PARAM;
            param->name.s=tmp;
            break;
          case RECEIVED1:
            state=RPORT1;
            break;
          case F_CR:
          case F_LF:
          case F_CRLF:
            state=END_OF_HEADER;
            goto end_via;
          default:
            state=GEN_PARAM;
        }
        break;
      case 'o':
      case 'O':
        switch(state){
          case F_PARAM:
            state=GEN_PARAM;
            param->name.s=tmp;
            break;
          case RPORT1:
            state=RPORT2;
            break;
          case F_CR:
          case F_LF:
          case F_CRLF:
            state=END_OF_HEADER;
            goto end_via;
          default:
            state=GEN_PARAM;
        }
        break;
      case 's':
      case 'S':
        switch(state){
          case F_PARAM:
            state=GEN_PARAM;
            param->name.s=tmp;
            break;
          case ALIAS4:
            state=FIN_ALIAS;
            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 parse_error;

 find_value:
  tmp++;
  for(;tmp<end;tmp++){
    switch(*tmp){
      case ' ':
      case '\t':
        switch(state){
          case L_VALUE:
          case F_VALUE: /*eat space*/
            break;
          case P_VALUE:
            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:
            LM_ERR("invalid char <%c> in state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case '\n':
        switch(state){
          case L_VALUE:
          case F_VALUE: /*eat space*/
          case P_STRING:
            saved_state=state;
            param->size=tmp-param->start;
            state=F_LF;
            break;
          case P_VALUE:
            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:
            LM_ERR("invalid char <%c> in state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case '\r':
        switch(state){
          case L_VALUE:
          case F_VALUE: /*eat space*/
          case P_STRING:
            saved_state=state;
            param->size=tmp-param->start;
            state=F_CR;
            break;
          case P_VALUE:
            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:
            LM_ERR("invalid char <%c> in state %d\n", *tmp, state);
            goto parse_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:
            LM_ERR("invalid char <%c> in state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case ';':
        switch(state){
          case P_VALUE:
            param->value.len=tmp-param->value.s;
            state=F_PARAM;
            goto endofvalue;
          case F_VALUE:
            param->value.len=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_via;
          case L_VALUE:
            if (param->type==FIN_RPORT){
              param->value.len=0;
              param->value.s=0; /* null value */
              state=F_PARAM;
              goto endofvalue;
            };
            /* no break */
          default:
            LM_ERR("invalid char <%c> in state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case ',':
        switch(state){
          case P_VALUE:
            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;
          case L_VALUE:
            if (param->type==FIN_RPORT){
              param->value.len=0;
              param->value.s=0; /* null value */
              state=F_VIA;
              goto endofvalue;
            };
            /* no break */
          default:
            LM_ERR("invalid char <%c> in state %d\n", *tmp, state);
            goto parse_error;
        }
        break; /* what to do? */
      case '"':
        switch(state){
          case F_VALUE:
            state=P_STRING;
            param->value.s=tmp+1;
            break;
          case P_STRING:
            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:
            LM_ERR("invalid char <%c> in state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case '\0':
        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:
            LM_ERR("invalid char <%c> in state %d\n", *tmp, state);
            goto parse_error;
        }
    }
  } /* for2 tmp*/

  /* end of buff and no CR/LF =>error*/
  saved_state=state;
  state=END_OF_HEADER;
  goto parse_error;

 endofparam:
 endofvalue:
  param->size=tmp-param->start;
normal_exit:
  *pstate=state;
  *psaved_state=saved_state;
  LM_DBG("found param type %d, <%.*s> = <%.*s>; state=%d\n", param->type,
      param->name.len, ZSW(param->name.s),
      (param->value.len?param->value.len:3),
      (param->value.len?param->value.s:"n/a"), 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 or
      *  RPORT (the only ones which can miss the value; HIDDEN is a
      *  special case )*/
  if ((param->type==GEN_PARAM)||(param->type==PARAM_RPORT)){
    saved_state=L_PARAM; /* change the saved_state, we have an unknown
                            param. w/o a value */
    /* param->size should be computed before */
    goto normal_exit;
  }
  *pstate=state;
  *psaved_state=saved_state;
  LM_DBG("error on  param type %d, <%.*s>, state=%d, saved_state=%d\n",
    param->type, param->name.len, ZSW(param->name.s), state, saved_state);

parse_error:
  LM_ERR("parse_via_param\n");
  param->type=PARAM_ERROR;
  *pstate=PARAM_ERROR;
  *psaved_state=state;
  return tmp;
}



/*
 * call it with a vb initialized to 0
 * returns: pointer after the parsed parts and sets vb->error
 * WARNING: don't forget to cleanup on error with free_via_list(vb)!
 */
char* parse_via(char* buffer, char* end, struct via_body *vbody)
{
  char* tmp;
  char* param_start;
  unsigned char state;
  unsigned char saved_state;
  int c_nest;
  int err;
  struct via_body* vb;
  struct via_param* param;

  vb=vbody; /* keep orignal vbody value, needed to set the error member
         in case of multiple via bodies in the same header */
parse_again:
  vb->error=PARSE_ERROR;
  /* parse start of via ( SIP/2.0/UDP    )*/
  state=F_SIP;
  saved_state=0; /*it should generate error if it's used without set*/
  param_start=0;
  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:
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_UDP;
            state=F_HOST; /* start looking for host*/
            goto main_via;
          case FIN_TCP:
            /* 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_TLS:
            /* finished proto parsing */
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_TLS;
            state=F_HOST; /* start looking for host*/
            goto main_via;
          case FIN_SCTP:
            /* finished proto parsing */
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_SCTP;
            state=F_HOST; /* start looking for host*/
            goto main_via;
          case FIN_WS:
          case WS_WSS:
            /* finished proto parsing */
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_WS;
            state=F_HOST; /* start looking for host*/
            goto main_via;
          case FIN_WSS:
            /* finished proto parsing */
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_WSS;
            state=F_HOST; /* start looking for host*/
            goto main_via;
          case OTHER_PROTO:
            /* finished proto parsing */
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_OTHER;
            state=F_HOST; /* start looking for host*/
            goto main_via;
          case FIN_SIP:
            vb->name.len=tmp-vb->name.s;
            state=L_VER;
            break;
          case FIN_VER:
            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:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_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:
            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:
            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_TLS:
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_TLS;
            state=F_LF;
            saved_state=F_HOST; /* start looking for host*/
            goto main_via;
          case WS_WSS:
          case FIN_WS:
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_WS;
            state=F_LF;
            saved_state=F_HOST; /* start looking for host*/
            goto main_via;
          case FIN_WSS:
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_WS;
            state=F_LF;
            saved_state=F_HOST; /* start looking for host*/
            goto main_via;
          case OTHER_PROTO:
            /* finished proto parsing */
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_OTHER;
            state=F_LF;
            saved_state=F_HOST; /* start looking for host*/
            goto main_via;
          case FIN_SIP:
            vb->name.len=tmp-vb->name.s;
            state=F_LF;
            saved_state=L_VER;
            break;
          case FIN_VER:
            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:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_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:
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_UDP;
            state=F_CR;
            saved_state=F_HOST;
            goto main_via;
          case FIN_TCP:
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_TCP;
            state=F_CR;
            saved_state=F_HOST;
            goto main_via;
          case FIN_TLS:
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_TLS;
            state=F_CR;
            saved_state=F_HOST;
            goto main_via;
          case WS_WSS:
          case FIN_WS:
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_WS;
            state=F_CR;
            saved_state=F_HOST;
            goto main_via;
          case FIN_WSS:
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_WSS;
            state=F_CR;
            saved_state=F_HOST;
            goto main_via;
          case OTHER_PROTO:
            vb->transport.len=tmp-vb->transport.s;
            vb->proto=PROTO_OTHER;
            state=F_CR;
            saved_state=F_HOST;
            goto main_via;
          case FIN_SIP:
            vb->name.len=tmp-vb->name.s;
            state=F_CR;
            saved_state=L_VER;
            break;
          case FIN_VER:
            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:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;

      case '/':
        switch(state){
          case FIN_SIP:
            vb->name.len=tmp-vb->name.s;
            state=F_VER;
            break;
          case FIN_VER:
            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:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
        /* match SIP*/
      case 'S':
      case 's':
        switch(state){
          case F_SIP:
            state=SIP1;
            vb->name.s=tmp;
            break;
          case TLS2:
            state=FIN_TLS;
            break;
          case F_PROTO:
            state=SCTP1;
            vb->transport.s=tmp;
            break;
          case WS1:
            state=WS_WSS;
            break;
          case WS_WSS:
            state=FIN_WSS;
            break;
          case OTHER_PROTO:
            break;
          case UDP1:
          case UDP2:
          case FIN_UDP:
          case TCP_TLS1:
          case TCP2:
          case FIN_TCP:
          case FIN_TLS:
          case SCTP1:
          case SCTP2:
          case SCTP3:
          case FIN_SCTP:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case 'I':
      case 'i':
        switch(state){
          case SIP1:
            state=SIP2;
            break;
          case OTHER_PROTO:
            break;
          case UDP1:
          case UDP2:
          case FIN_UDP:
          case TCP_TLS1:
          case TCP2:
          case FIN_TCP:
          case TLS2:
          case FIN_TLS:
          case SCTP1:
          case SCTP2:
          case SCTP3:
          case FIN_SCTP:
          case WS1:
          case WS_WSS:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_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;
          case SCTP3:
            state=FIN_SCTP;
            break;
          case OTHER_PROTO:
            break;
          case UDP1:
          case FIN_UDP:
          case TCP_TLS1:
          case FIN_TCP:
          case TLS2:
          case FIN_TLS:
          case SCTP1:
          case SCTP2:
          case FIN_SCTP:
          case WS1:
          case WS_WSS:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case 'U':
      case 'u':
        switch(state){
          case F_PROTO:
            state=UDP1;
            vb->transport.s=tmp;
            break;
          case OTHER_PROTO:
            break;
          case UDP1:
          case UDP2:
          case FIN_UDP:
          case TCP_TLS1:
          case TCP2:
          case FIN_TCP:
          case TLS2:
          case FIN_TLS:
          case SCTP1:
          case SCTP2:
          case SCTP3:
          case FIN_SCTP:
          case WS1:
          case WS_WSS:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case 'D':
      case 'd':
        switch(state){
          case UDP1:
            state=UDP2;
            break;
          case OTHER_PROTO:
            break;
          case UDP2:
          case FIN_UDP:
          case TCP_TLS1:
          case TCP2:
          case FIN_TCP:
          case TLS2:
          case FIN_TLS:
          case SCTP1:
          case SCTP2:
          case SCTP3:
          case FIN_SCTP:
          case WS1:
          case WS_WSS:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case 'T':
      case 't':
        switch(state){
          case F_PROTO:
            state=TCP_TLS1;
            vb->transport.s=tmp;
            break;
          case SCTP2:
            state=SCTP3;
            break;
          case OTHER_PROTO:
            break;
          case UDP1:
          case UDP2:
          case FIN_UDP:
          case TCP_TLS1:
          case TCP2:
          case FIN_TCP:
          case TLS2:
          case FIN_TLS:
          case SCTP1:
          case SCTP3:
          case FIN_SCTP:
          case WS1:
          case WS_WSS:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case 'C':
      case 'c':
        switch(state){
          case TCP_TLS1:
            state=TCP2;
            break;
          case SCTP1:
            state=SCTP2;
            break;
          case OTHER_PROTO:
            break;
          case UDP1:
          case UDP2:
          case FIN_UDP:
          case TCP2:
          case FIN_TCP:
          case TLS2:
          case FIN_TLS:
          case SCTP2:
          case SCTP3:
          case FIN_SCTP:
          case WS1:
          case WS_WSS:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case 'L':
      case 'l':
        switch(state){
          case TCP_TLS1:
            state=TLS2;
            break;
          case OTHER_PROTO:
            break;
          case UDP1:
          case UDP2:
          case FIN_UDP:
          case TCP2:
          case FIN_TCP:
          case TLS2:
          case FIN_TLS:
          case SCTP1:
          case SCTP2:
          case SCTP3:
          case FIN_SCTP:
          case WS1:
          case WS_WSS:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case 'W':
      case 'w':
        switch(state){
          case F_PROTO:
            state=WS1;
            vb->transport.s=tmp;
            break;
          case OTHER_PROTO:
            break;
          case UDP1:
          case UDP2:
          case FIN_UDP:
          case TCP_TLS1:
          case TCP2:
          case FIN_TCP:
          case TLS2:
          case FIN_TLS:
          case SCTP1:
          case SCTP2:
          case SCTP3:
          case FIN_SCTP:
          case WS1:
          case WS_WSS:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      /*match 2.0*/
      case '2':
        switch(state){
          case F_VER:
            state=VER1;
            vb->version.s=tmp;
            break;
          case OTHER_PROTO:
            break;
          case UDP1:
          case UDP2:
          case FIN_UDP:
          case TCP_TLS1:
          case TCP2:
          case FIN_TCP:
          case TLS2:
          case FIN_TLS:
          case SCTP1:
          case SCTP2:
          case SCTP3:
          case FIN_SCTP:
          case WS1:
          case WS_WSS:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case '.':
        switch(state){
          case VER1:
            state=VER2;
            break;
          case OTHER_PROTO:
            break;
          case UDP1:
          case UDP2:
          case FIN_UDP:
          case TCP_TLS1:
          case TCP2:
          case FIN_TCP:
          case TLS2:
          case FIN_TLS:
          case SCTP1:
          case SCTP2:
          case SCTP3:
          case FIN_SCTP:
          case WS1:
          case WS_WSS:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
         break;
      case '0':
        switch(state){
          case VER2:
            state=FIN_VER;
            break;
          case OTHER_PROTO:
            break;
          case UDP1:
          case UDP2:
          case FIN_UDP:
          case TCP_TLS1:
          case TCP2:
          case FIN_TCP:
          case TLS2:
          case FIN_TLS:
          case SCTP1:
          case SCTP2:
          case SCTP3:
          case FIN_SCTP:
          case WS1:
          case WS_WSS:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;

      default:
        switch(state){
          case F_PROTO:
            state=OTHER_PROTO;
            vb->transport.s=tmp;
            break;
          case OTHER_PROTO:
            break;
          case UDP1:
          case UDP2:
          case FIN_UDP:
          case TCP_TLS1:
          case TCP2:
          case FIN_TCP:
          case TLS2:
          case FIN_TLS:
          case SCTP1:
          case SCTP2:
          case SCTP3:
          case FIN_SCTP:
          case WS1:
          case WS_WSS:
          case FIN_WS:
          case FIN_WSS:
            state=OTHER_PROTO;
            break;
          default:
            LM_ERR("bad char <%c> on state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
    }
  } /* for tmp*/

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

 main_via:
  /* inc tmp to point to the next char*/
  tmp++;
  c_nest=0;
  /*state should always be F_HOST here*/;
  for(;tmp<end;tmp++){
    switch(*tmp){
    case ' ':
    case '\t':
      switch(state){
          case F_HOST:/*eat the spaces*/
            break;
          case P_HOST:
             /*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:
            /*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: /*no spaces allowed*/
          case P_IP6HOST:
            LM_ERR("bad ipv6 reference\n");
            goto parse_error;
          case F_CRLF:
          case F_LF:
          case F_CR:
            /*previous=crlf and now =' '*/
            state=saved_state;
            break;
          default:
            LM_ERR("on <%c>, state=%d\n",*tmp, state);
            goto parse_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:
             /*mark end of host*/
             vb->host.len=tmp-vb->host.s;
             saved_state=L_PORT;
             state=F_LF;
             break;
          case P_PORT:
            /*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:
            LM_CRIT("BUG on <%c>\n",*tmp);
            goto  parse_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:
             /*mark end of host*/
             vb->host.len=tmp-vb->host.s;
             saved_state=L_PORT;
             state=F_CR;
             break;
          case P_PORT:
            /*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:
            LM_ERR("on <%c>\n",*tmp);
            goto parse_error;
        }
      break;

      case ':':
        switch(state){
          case F_IP6HOST:
            state=P_IP6HOST;
            break;
          case P_IP6HOST:
            break;
          case P_HOST:
            /*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:
            LM_ERR("bad port\n");
            goto parse_error;
          case L_PARAM:
          case F_PARAM:
          case P_PARAM:
            LM_ERR("bad char <%c> in state %d\n",
              *tmp,state);
            goto parse_error;
          case L_VIA:
          case F_VIA:
            LM_ERR("bad char in compact via\n");
            goto parse_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:
            LM_ERR("on <%c> state %d\n", *tmp, state);
            goto parse_error;
        }
        break;
      case ';':
        switch(state){
          case F_HOST:
          case F_IP6HOST:
            LM_ERR(" no host found\n");
            goto parse_error;
          case P_IP6HOST:
            LM_ERR(" bad ipv6 reference\n");
            goto parse_error;
          case P_HOST:
            vb->host.len=tmp-vb->host.s;
            state=F_PARAM;
            param_start=tmp+1;
            break;
          case P_PORT:
            /*mark the end*/
            vb->port_str.len=tmp-vb->port_str.s;
            /* fall through */
          case L_PORT:
          case L_PARAM:
            state=F_PARAM;
            param_start=tmp+1;
            break;
          case F_PORT:
            LM_ERR(" bad char <%c> in state %d\n",
              *tmp,state);
            goto parse_error;
          case F_PARAM:
            LM_ERR("null param?\n");
            goto parse_error;
          case P_PARAM:
            /*hmm next, param?*/
            state=F_PARAM;
            param_start=tmp+1;
            break;
          case L_VIA:
          case F_VIA:
            LM_ERR("bad char <%c> in next via\n", *tmp);
            goto parse_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:
            LM_ERR("on <%c> state %d\n", *tmp, state);
            goto parse_error;
        }
      break;
      case ',':
        switch(state){
          case F_HOST:
          case F_IP6HOST:
            LM_ERR("no host found\n");
            goto parse_error;
          case P_IP6HOST:
            LM_ERR(" bad ipv6 reference\n");
            goto parse_error;
          case P_HOST:
            /*mark the end*/
            vb->host.len=tmp-vb->host.s;
            state=F_VIA;
            break;
          case P_PORT:
            /*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:
            LM_ERR("invalid char <%c> in state %d\n", *tmp,state);
            goto parse_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:
            LM_ERR("on <%c> state %d\n",*tmp, state);
            goto  parse_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 ']'*/
            LM_ERR(" on <%c> state %d\n", *tmp, state);
            goto  parse_error;
          case P_HOST:
            /*mark the end*/
            vb->host.len=tmp-vb->host.s;
            state=F_COMMENT;
            c_nest++;
            break;
          case P_PORT:
            /*mark the end*/
            vb->port_str.len=tmp-vb->port_str.s;
            state=F_COMMENT;
            c_nest++;
            break;
          case P_PARAM:
            /*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++;
            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:
            LM_ERR("on <%c> state %d\n", *tmp, state);
            goto  parse_error;
        }
      break;
      case ')':
        switch(state){
          case F_COMMENT:
          case P_COMMENT:
            if (c_nest){
              c_nest--;
              if(c_nest==0){
                state=L_VIA;
                vb->comment.len=tmp-vb->comment.s;
                break;
              }
            }else{
              LM_ERR(" missing '(' - nesting= %d\n", c_nest);
               goto parse_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:
            LM_ERR(" on <%c> state %d\n",*tmp, state);
            goto  parse_error;
          case F_CRLF:
          case F_LF:
          case F_CR:
            /*previous=crlf and now !=' '*/
            goto endofheader;
          default:
            LM_ERR("on <%c> state %d\n", *tmp, state);
            goto  parse_error;
        }
        break;
      case '[':
        switch(state){
          case F_HOST:
            vb->host.s=tmp; /* mark start here (include [])*/
            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:
            LM_ERR("on <%c> state %d\n",*tmp, state);
            goto  parse_error;
        }
        break;
      case ']':
        switch(state){
          case P_IP6HOST:
            /*mark the end*/
            vb->host.len=(tmp-vb->host.s)+1; /* include "]" */
            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:
            LM_ERR("on <%c> state %d\n",*tmp, state);
            goto  parse_error;
        }
        break;
      case '\0':
        break;

      default:
        switch(state){
          case F_HOST:
            state=P_HOST;
            vb->host.s=tmp;
            //break;
          case P_HOST:
            /*check if host allowed char*/
            if ( (*tmp<'a' || *tmp>'z') && (*tmp<'A' || *tmp>'Z')
            && (*tmp<'0' || *tmp>'9') && *tmp!='-' && *tmp!='.')
              goto parse_error;
            break;
          case F_PORT:
            state=P_PORT;
            vb->port_str.s=tmp;
            //break;
          case P_PORT:
            /*check if number*/
            if ( *tmp<'0' || *tmp>'9' )
              goto parse_error;
            break;
          case F_PARAM:
            /*state=P_PARAM*/;
            if(vb->params.s==0) vb->params.s=param_start;
            param=pkg_malloc(sizeof(struct via_param));
            if (param==0){
              LM_ERR("no pkg memory left\n");
              goto error;
            }
            memset(param,0, sizeof(struct via_param));
            param->start=param_start;
            tmp=parse_via_param(tmp, end, &state, &saved_state,
                      param);

            switch(state){
              case F_PARAM:
                param_start=tmp+1;
              case L_PARAM:
              case F_LF:
              case F_CR:
                vb->params.len=tmp - vb->params.s;
                break;
              case F_VIA:
                vb->params.len=param->start+param->size
                        -vb->params.s;
                break;
              case END_OF_HEADER:
                vb->params.len=param->start+param->size
                        -vb->params.s;
                break;
              case PARAM_ERROR:
                pkg_free(param);
                goto parse_error;
              default:
                pkg_free(param);
                LM_ERR(" after parse_via_param: invalid "
                    "char <%c> on state %d\n",*tmp, state);
                goto parse_error;
            }
            /*add param to the list*/
            if (vb->last_param)  vb->last_param->next=param;
            else        vb->param_lst=param;
            vb->last_param=param;
            /* update param. shortcuts */
            switch(param->type){
              case PARAM_BRANCH:
                vb->branch=param;
                break;
              case PARAM_RECEIVED:
                vb->received=param;
                break;
              case PARAM_RPORT:
                vb->rport=param;
                break;
              case PARAM_I:
                vb->i=param;
                break;
              case PARAM_ALIAS:
                vb->alias=param;
                break;
              case PARAM_MADDR:
                vb->maddr=param;
                break;
            }

            if (state==END_OF_HEADER){
              state=saved_state;
              goto endofheader;
            }
            break;
          case P_PARAM:
            break;
          case F_VIA:
            /*vb->next=tmp;*/ /*???*/
            goto nextvia;
          case L_PORT:
          case L_PARAM:
          case L_VIA:
            LM_ERR("on <%c> state %d (default)\n",*tmp, state);
            goto  parse_error;
          case F_COMMENT:
            state=P_COMMENT;
            vb->comment.s=tmp;
            break;
          case P_COMMENT:
            break;
          case F_IP6HOST:
            state=P_IP6HOST;
            //break;
          case P_IP6HOST:
            /*check if host allowed char*/
            if ( (*tmp<'a' || *tmp>'f') && (*tmp<'A' || *tmp>'F')
            && (*tmp<'0' || *tmp>'9') && *tmp!=':')
              goto parse_error;
            break;
          case F_CRLF:
          case F_LF:
          case F_CR:
            /*previous=crlf and now !=' '*/
            goto endofheader;
          default:
            LM_ERR("invalid char <%c> in state %d\n",*tmp, state);
            goto parse_error;
        }


    }
  }

  LM_DBG("end of packet reached, state=%d\n", state);
  goto endofpacket; /*end of packet, probably should be goto error*/

endofheader:
  state=saved_state;
  LM_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:
      LM_ERR(" invalid via - end of header in state %d\n", state);
      goto parse_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);
  */
  /*LM_DBG("rest=<%s>\n", tmp);*/

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

parse_error:
  if (end>buffer){
    LM_ERR(" <%.*s>\n", (int)(end-buffer), ZSW(buffer));
  }
  if ((tmp>buffer)&&(tmp<end)){
    LM_ERR("parsed so far:<%.*s>\n",
        (int)(tmp-buffer), ZSW(buffer) );
  }else{
    LM_ERR("via parse failed\n");
  }
error:
  vb->error=PARSE_ERROR;
  vbody->error=PARSE_ERROR; /* make sure the first via body is marked
                 as bad also */
  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);
  }
}

Coverage Report

Created: 2026-08-31 06:36