/* 
  * $Id$

  *

  *
  * Copyright (C) 2001-2003 Fhg Fokus
  *
  * This file is part of ser, a free SIP server.
  *
  * ser is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version
  *
  * For a license to use the ser software under conditions
  * other than those described here, or to purchase support for this
  * software, please contact iptel.org by e-mail at the following addresses:
  *    info@iptel.org
  *
  * ser is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License 
  * along with this program; if not, write to the Free Software 
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  * 
  *
  * History:
  * --------

  * 2003-03-01  VOICE_MAIL defs removed (jiri)
  * 2003-02-28  scratchpad compatibility abandoned (jiri)
  * 2003-01-20  bug_fix: use of return value of snprintf aligned to C99 (jiri)
  * 2003-01-23  added rport patches, contributed by 
  *              Maxim Sobolev <sobomax@FreeBSD.org> and heavily modified by me
  *              (andrei)
  * 2003-01-24  added i param to via of outgoing requests (used by tcp),
  *              modified via_builder params (andrei)
  * 2003-01-27  more rport fixes (make use of new via_param->start)  (andrei)
  * 2003-01-27  next baby-step to removing ZT - PRESERVE_ZT (jiri)
  * 2003-01-29  scratchpad removed (jiri)
  * 2003-03-18  killed the build_warning snprintf (andrei)

  *

  */
 
 

 #include <sys/types.h>

 #include <sys/socket.h>

 #include <netdb.h>
 #include <string.h>

 #include <stdio.h>

 #include <stdlib.h>

 #include "comp_defs.h"

 #include "msg_translator.h"

 #include "globals.h"

 #include "error.h"

 #include "mem/mem.h"

 #include "dprint.h"
 #include "config.h"

 #include "md5utils.h"

 #include "data_lump_rpl.h"

 #include "ip_addr.h"
 #include "resolve.h"

 #include "ut.h"

 #include "pt.h"

 #define append_str(_dest,_src,_len) \

 	do{\
 		memcpy( (_dest) , (_src) , (_len) );\
 		(_dest) += (_len) ;\
 	}while(0);
 

 #define append_str_trans(_dest,_src,_len,_msg) \
 	append_str( (_dest), (_src), (_len) );

 extern char version[];
 extern int version_len;

 
 
 /* checks if ip is in host(name) and ?host(ip)=name?
  * ip must be in network byte order!
  *  resolver = DO_DNS | DO_REV_DNS; if 0 no dns check is made
  * return 0 if equal */
 static int check_via_address(struct ip_addr* ip, str *name, 
 				unsigned short port, int resolver)
 {
 	struct hostent* he;
 	int i;
 	char* s;
 
 	/* maybe we are lucky and name it's an ip */
 	s=ip_addr2a(ip);
 	if (s){
 		DBG("check_address(%s, %.*s, %d)\n", 
 			s, name->len, name->s, resolver);
 
 	#ifdef USE_IPV6
 		if ((ip->af==AF_INET6) && (strncasecmp(name->s, s, name->len)==0))
 			return 0;
 		else
 	#endif
 
 			if (strncmp(name->s, s, name->len)==0) 
 				return 0;
 	}else{
 		LOG(L_CRIT, "check_address: BUG: could not convert ip address\n");
 		return -1;
 	}
 
 	if (port==0) port=SIP_PORT;
 	if (resolver&DO_DNS){
 		DBG("check_address: doing dns lookup\n");
 		/* try all names ips */

 		he=sip_resolvehost(name, &port, 0); /* FIXME proto? */

 		if (he && ip->af==he->h_addrtype){
 			for(i=0;he && he->h_addr_list[i];i++){
 				if ( memcmp(&he->h_addr_list[i], ip->u.addr, ip->len)==0)
 					return 0;
 			}
 		}
 	}
 	if (resolver&DO_REV_DNS){
 		DBG("check_address: doing rev. dns lookup\n");
 		/* try reverse dns */
 		he=rev_resolvehost(ip);
 		if (he && (strncmp(he->h_name, name->s, name->len)==0))
 			return 0;
 		for (i=0; he && he->h_aliases[i];i++){
 			if (strncmp(he->h_aliases[i],name->s, name->len)==0)
 				return 0;
 		}
 	}
 	return -1;
 }

 static char * warning_builder( struct sip_msg *msg, unsigned int *returned_len)

 {
 	static char buf[MAX_WARNING_LEN];
 	static unsigned int fix_len=0;
 	str *foo;

 	int print_len, l;
 	int clen;
 	char* t;
 
 #define str_pair_print(string, string2, string2_len) \
 		do{ \
 			l=strlen((string)); \
 		if ((clen+(string2_len)+l)>MAX_WARNING_LEN) \
 			goto error_overflow; \
 		memcpy(buf+clen, (string), l); \
 		clen+=l; \
 		memcpy(buf+clen, (string2), (string2_len)); \
 		clen+=(string2_len); }while(0)
 		
 		
 #define str_int_print(string, intval)\
 		do{\
 			t=int2str((intval), &print_len); \
 			str_pair_print(string, t, print_len);\
 		} while(0)
 		
 #define str_ipaddr_print(string, ipaddr_val)\
 		do{\
 			t=ip_addr2a((ipaddr_val)); \
 			print_len=strlen(t); \
 			str_pair_print(string, t, print_len);\
 		} while(0)
 	

 	if (!fix_len)
 	{

 		memcpy(buf+fix_len,WARNING, WARNING_LEN);
 		fix_len +=WARNING_LEN;

 		memcpy(buf+fix_len, bind_address->name.s,bind_address->name.len);
 		fix_len += bind_address->name.len;

 		//*(buf+fix_len++) = ':';

 		memcpy(buf+fix_len,bind_address->port_no_str.s,
 			bind_address->port_no_str.len);
 		fix_len += bind_address->port_no_str.len;

 		memcpy(buf+fix_len, WARNING_PHRASE,WARNING_PHRASE_LEN);
 		fix_len += WARNING_PHRASE_LEN;

 	}

 	/*adding out_uri*/
 	if (msg->new_uri.s)
 		foo=&(msg->new_uri);
 	else
 		foo=&(msg->first_line.u.request.uri);

 		clen=fix_len;
 		
 		/* pid= */
 		str_int_print("pid=", my_pid());
 		/* req_src_ip= */
 		str_ipaddr_print(" req_src_ip=", &msg->rcv.src_ip);
 		str_int_print(" req_src_port=", ntohs(msg->rcv.src_port));
 		str_pair_print(" in_uri=", msg->first_line.u.request.uri.s,
 									msg->first_line.u.request.uri.len);
 		str_pair_print(" out_uri=", foo->s, foo->len);
 		str_pair_print(" via_cnt", msg->parsed_flag & HDR_EOH ? "=" : ">", 1);
 		str_int_print("=", via_cnt);
 		if (clen<MAX_WARNING_LEN){ buf[clen]='"'; clen++; }
 		else goto error_overflow;
 		
 		
 		*returned_len=clen;
 		return buf;
 error_overflow:

 		LOG(L_ERR, "ERROR: warning_builder: buffer size exceeded\n");

 		*returned_len=0;
 		return 0;

 }

 char* received_builder(struct sip_msg *msg, unsigned int *received_len)

 {
 	char *buf;
 	int  len;
 	struct ip_addr *source_ip;
 	char *tmp;
 	int  tmp_len;
 	int extra_len;
 
 	extra_len = 0;

 	source_ip=&msg->rcv.src_ip;

 
 	buf=pkg_malloc(sizeof(char)*MAX_RECEIVED_SIZE);
 	if (buf==0){
 		ser_error=E_OUT_OF_MEM;

 		LOG(L_ERR, "ERROR: received_builder: out of memory\n");

 		return 0;
 	}
 	memcpy(buf, RECEIVED, RECEIVED_LEN);

 	if ( (tmp=ip_addr2a(source_ip))==0)
 		return 0; /* error*/

 	tmp_len=strlen(tmp);

 	len=RECEIVED_LEN+tmp_len;

 	if(source_ip->af==AF_INET6){
 		len+=2;
 		buf[RECEIVED_LEN]='[';
 		buf[RECEIVED_LEN+tmp_len+1]=']';
 		extra_len=1;
 	}
 	
 	memcpy(buf+RECEIVED_LEN+extra_len, tmp, tmp_len);

 	buf[len]=0; /*null terminate it */

 
 	*received_len = len;
 	return buf;
 }
 
 
 

 char* rport_builder(struct sip_msg *msg, unsigned int *rport_len)
 {
 	char* buf;
 	char* tmp;
 	int tmp_len;
 	int len;
 	
 	tmp_len=0;
 	tmp=int2str(ntohs(msg->rcv.src_port), &tmp_len);

 	len=RPORT_LEN+tmp_len;
 	buf=pkg_malloc(sizeof(char)*(len+1));/* space for null term */

 	if (buf==0){
 		ser_error=E_OUT_OF_MEM;
 		LOG(L_ERR, "ERROR: rport_builder: out of memory\n");
 		return 0;
 	}
 	memcpy(buf, RPORT, RPORT_LEN);
 	memcpy(buf+RPORT_LEN, tmp, tmp_len);

 	buf[len]=0; /*null terminate it*/

 	
 	*rport_len=len;
 	return buf;
 }
 
 
 

 char* id_builder(struct sip_msg* msg, unsigned int *id_len)
 {
 	char* buf;
 	int len, value_len;
 	char revhex[sizeof(int)*2];
 	char* p;
 	int size;
 	
 	size=sizeof(int)*2;
 	p=&revhex[0];
 	if (int2reverse_hex(&p, &size, msg->rcv.proto_reserved1)==-1){
 		LOG(L_CRIT, "BUG: id_builder: not enough space for id\n");
 		return 0;
 	}
 	value_len=p-&revhex[0];

 	len=ID_PARAM_LEN+value_len; 
 	buf=pkg_malloc(sizeof(char)*(len+1));/* place for ending \0 */

 	if (buf==0){
 		ser_error=E_OUT_OF_MEM;
 		LOG(L_ERR, "ERROR: rport_builder: out of memory\n");
 		return 0;
 	}
 	memcpy(buf, ID_PARAM, ID_PARAM_LEN);
 	memcpy(buf+ID_PARAM_LEN, revhex, value_len);

 	buf[len]=0; /* null terminate it */

 	*id_len=len;
 	return buf;
 }
 
 
 

 char* clen_builder(struct sip_msg* msg, unsigned int *clen_len)
 {
 	char* buf;
 	int len;
 	int value;
 	char* value_s;
 	int value_len;
 	char* body;
 	
 	
 	body=get_body(msg);
 	if (body==0){
 		ser_error=E_BAD_REQ;
 		LOG(L_ERR, "ERROR: clen_builder: no message body found"
 					" (missing crlf?)");
 		return 0;
 	}
 	value=msg->len-(int)(body-msg->buf);
 	value_s=int2str(value, &value_len);
 	DBG("clen_builder: content-length: %d (%s)\n", value, value_s);
 		
 	len=CONTENT_LENGTH_LEN+value_len+CRLF_LEN;
 	buf=pkg_malloc(sizeof(char)*(len+1));
 	if (buf==0){
 		ser_error=E_OUT_OF_MEM;
 		LOG(L_ERR, "ERROR: clen_builder: out of memory\n");
 		return 0;
 	}
 	memcpy(buf, CONTENT_LENGTH, CONTENT_LENGTH_LEN);
 	memcpy(buf+CONTENT_LENGTH_LEN, value_s, value_len);
 	memcpy(buf+CONTENT_LENGTH_LEN+value_len, CRLF, CRLF_LEN);

 	buf[len]=0; /* null terminate it */

 	*clen_len=len;
 	return buf;
 }
 
 
 

 /* computes the "unpacked" len of a lump list,
    code moved from build_req_from_req */
 static inline int lumps_len(struct lump* l)

 {

 	int s_offset;
 	int new_len;
 	struct lump* t;
 	struct lump* r;

 
 	s_offset=0;

 	new_len=0;
 	for(t=l;t;t=t->next){

 		for(r=t->before;r;r=r->before){
 			switch(r->op){
 				case LUMP_ADD:
 					new_len+=r->len;
 					break;
 				default:
 					/* only ADD allowed for before/after */

 					LOG(L_CRIT, "BUG: lumps_len: invalid op "

 							"for data lump (%x)\n", r->op);

 			}
 		}
 		switch(t->op){
 			case LUMP_ADD:
 				new_len+=t->len;
 				break;
 			case LUMP_DEL:
 				/* fix overlapping deleted zones */
 				if (t->u.offset < s_offset){
 					/* change len */
 					if (t->len>s_offset-t->u.offset)
 							t->len-=s_offset-t->u.offset;
 					else t->len=0;
 					t->u.offset=s_offset;
 				}
 				s_offset=t->u.offset+t->len;
 				new_len-=t->len;
 				break;
 			case LUMP_NOP:
 				/* fix offset if overlapping on a deleted zone */
 				if (t->u.offset < s_offset){
 					t->u.offset=s_offset;
 				}else
 					s_offset=t->u.offset;
 				/* do nothing */
 				break;

 			default:

 				LOG(L_CRIT,"BUG:lumps_len: invalid"

 							" op for data lump (%x)\n", r->op);
 		}
 		for (r=t->after;r;r=r->after){
 			switch(r->op){
 				case LUMP_ADD:
 					new_len+=r->len;
 					break;
 				default:
 					/* only ADD allowed for before/after */

 					LOG(L_CRIT, "BUG:lumps_len: invalid"

 								" op for data lump (%x)\n", r->op);
 			}
 		}
 	}

 	return new_len;
 }

 
 /* another helper functions, adds/Removes the lump,
 	code moved form build_req_from_req  */
 

 static inline void process_lumps(	struct lump* l,	char* new_buf, 
 									unsigned int* new_buf_offs, char* orig,
 									unsigned int* orig_offs)

 {
 	struct lump *t;
 	struct lump *r;
 	int size;
 	int offset;
 	int s_offset;
 	
 	offset=*new_buf_offs;
 	s_offset=*orig_offs;
 	
 	for (t=l;t;t=t->next){

 		switch(t->op){
 			case LUMP_ADD:
 				/* just add it here! */
 				/* process before  */
 				for(r=t->before;r;r=r->before){
 					switch (r->op){
 						case LUMP_ADD:
 							/*just add it here*/
 							memcpy(new_buf+offset, r->u.value, r->len);
 							offset+=r->len;
 							break;
 						default:
 							/* only ADD allowed for before/after */

 							LOG(L_CRIT, "BUG:process_lumps: "

 									"invalid op for data lump (%x)\n", r->op);

 					}
 				}
 				/* copy "main" part */
 				memcpy(new_buf+offset, t->u.value, t->len);
 				offset+=t->len;
 				/* process after */
 				for(r=t->after;r;r=r->after){
 					switch (r->op){
 						case LUMP_ADD:
 							/*just add it here*/
 							memcpy(new_buf+offset, r->u.value, r->len);
 							offset+=r->len;
 							break;
 						default:
 							/* only ADD allowed for before/after */

 							LOG(L_CRIT, "BUG:process_lumps: "

 									"invalid op for data lump (%x)\n", r->op);

 					}
 				}
 				break;
 			case LUMP_NOP:
 			case LUMP_DEL:
 				/* copy till offset */
 				if (s_offset>t->u.offset){
 					DBG("Warning: (%d) overlapped lumps offsets,"
 						" ignoring(%x, %x)\n", t->op, s_offset,t->u.offset);
 					/* this should've been fixed above (when computing len) */
 					/* just ignore it*/
 					break;
 				}
 				size=t->u.offset-s_offset;
 				if (size){
 					memcpy(new_buf+offset, orig+s_offset,size);
 					offset+=size;
 					s_offset+=size;
 				}
 				/* process before  */
 				for(r=t->before;r;r=r->before){
 					switch (r->op){
 						case LUMP_ADD:
 							/*just add it here*/
 							memcpy(new_buf+offset, r->u.value, r->len);
 							offset+=r->len;
 							break;
 						default:
 							/* only ADD allowed for before/after */

 							LOG(L_CRIT, "BUG:process_lumps: "

 									"invalid op for data lump (%x)\n",r->op);

 					}
 				}
 				/* process main (del only) */
 				if (t->op==LUMP_DEL){
 					/* skip len bytes from orig msg */
 					s_offset+=t->len;
 				}
 				/* process after */
 				for(r=t->after;r;r=r->after){
 					switch (r->op){
 						case LUMP_ADD:
 							/*just add it here*/
 							memcpy(new_buf+offset, r->u.value, r->len);
 							offset+=r->len;
 							break;
 						default:
 							/* only ADD allowed for before/after */

 							LOG(L_CRIT, "BUG:process_lumps: "

 									"invalid op for data lump (%x)\n", r->op);

 					}
 				}
 				break;
 			default:

 					LOG(L_CRIT, "BUG: process_lumps: "

 							"unknown op (%x)\n", t->op);

 		}
 	}

 	*new_buf_offs=offset;
 	*orig_offs=s_offset;
 }
 
 
 
 char * build_req_buf_from_sip_req( struct sip_msg* msg,
 								unsigned int *returned_len,

 								struct socket_info* send_sock, int proto)

 {

 	unsigned int len, new_len, received_len, rport_len, uri_len, via_len;

 	char* line_buf;
 	char* received_buf;

 	char* rport_buf;

 	char* new_buf;
 	char* buf;
 	unsigned int offset, s_offset, size;
 	struct lump* anchor;

 	int r;

 	str branch;
 	str extra_params;
 	
 #ifdef USE_TCP
 	char* id_buf;

 	unsigned int id_len;

 	char* clen_buf;

 	unsigned int clen_len;

 	
 	
 	id_buf=0;
 	id_len=0;

 	clen_buf=0;
 	clen_len=0;

 #endif
 	extra_params.len=0;
 	extra_params.s=0;

 	uri_len=0;
 	buf=msg->buf;
 	len=msg->len;
 	received_len=0;

 	rport_len=0;

 	new_buf=0;
 	received_buf=0;

 	rport_buf=0;

 	line_buf=0;

 	
 #ifdef USE_TCP
 	/* add id if tcp */
 	if (msg->rcv.proto==PROTO_TCP){
 		if  ((id_buf=id_builder(msg, &id_len))==0){
 			LOG(L_ERR, "ERROR: build_req_buf_from_sip_req:"
 							" id_builder failed\n");
 			goto error01; /* free everything */
 		}
 		extra_params.s=id_buf;
 		extra_params.len=id_len;
 	}

 	/* if sending proto == tcp, check if Content-Length needs to be added*/
 	if (proto==PROTO_TCP){
 		/* first of all parse content-length */
 		if (parse_headers(msg, HDR_CONTENTLENGTH, 0)==-1){
 			LOG(L_ERR, "build_req_buf_from_sip_req:"
 							" error parsing content-length\n");
 			goto skip_clen;
 		}
 		if (msg->content_length==0){
 			/* we need to add it */
 			if ((clen_buf=clen_builder(msg, &clen_len))==0){
 				LOG(L_ERR, "build_req_buf_from_sip_req:" 
 								" clen_builder failed\n");
 				goto skip_clen;
 			}
 		}
 	}
 skip_clen:

 #endif
 	branch.s=msg->add_to_branch_s;
 	branch.len=msg->add_to_branch_len;
 	line_buf = via_builder( &via_len, send_sock, &branch,
 							extra_params.len?&extra_params:0, proto);

 	if (!line_buf){
 		LOG(L_ERR,"ERROR: build_req_buf_from_sip_req: no via received!\n");

 		goto error00;

 	}
 	/* check if received needs to be added */

 	r=check_via_address(&msg->rcv.src_ip, &msg->via1->host, 
 		msg->via1->port, received_dns);

 	if (r!=0){

 		if ((received_buf=received_builder(msg,&received_len))==0){
 			LOG(L_ERR, "ERROR: build_req_buf_from_sip_req:"
 							" received_builder failed\n");

 			goto error01;  /* free also line_buf */

 		}

 	}

 	
 	/* check if rport needs to be updated */
 	if (msg->via1->rport && msg->via1->rport->value.s==0){

 		if ((rport_buf=rport_builder(msg, &rport_len))==0){
 			LOG(L_ERR, "ERROR: build_req_buf_from_sip_req:"
 							" rport_builder failed\n");

 			goto error01; /* free everything */

 		}

 	}

 
 	/* add via header to the list */
 	/* try to add it before msg. 1st via */
 	/* add first via, as an anchor for second via*/
 	anchor=anchor_lump(&(msg->add_rm), msg->via1->hdr.s-buf, 0, HDR_VIA);

 	if (anchor==0) goto error01;

 	if (insert_new_lump_before(anchor, line_buf, via_len, HDR_VIA)==0)

 		goto error01;

 	/* if received needs to be added, add anchor after host and add it */
 	if (received_len){
 		if (msg->via1->params.s){
 				size= msg->via1->params.s-msg->via1->hdr.s-1; /*compensate
 															  for ';' */
 		}else{
 				size= msg->via1->host.s-msg->via1->hdr.s+msg->via1->host.len;
 				if (msg->via1->port!=0){
 					/*size+=strlen(msg->via1->hdr.s+size+1)+1;*/
 					size += msg->via1->port_str.len + 1; /* +1 for ':'*/
 				}
 			#ifdef USE_IPV6
 				if(send_sock->address.af==AF_INET6) size+=1; /* +1 for ']'*/
 			#endif
 		}
 		anchor=anchor_lump(&(msg->add_rm),msg->via1->hdr.s-buf+size,0,
 				HDR_VIA);

 		if (anchor==0) goto error02; /* free received_buf */

 		if (insert_new_lump_after(anchor, received_buf, received_len, HDR_VIA)

 				==0 ) goto error02; /* free received_buf */
 	}
 	/* if rport needs to be updated, delete it and add it's value */
 	if (rport_len){

 		anchor=del_lump(&(msg->add_rm), msg->via1->rport->start-buf-1, /*';'*/

 							msg->via1->rport->size+1 /* ; */, HDR_VIA);

 		if (anchor==0) goto error03; /* free rport_buf*/
 		if (insert_new_lump_after(anchor, rport_buf, rport_len, HDR_VIA)==0)
 			goto error03; /* free rport_buf*/

 	}

 #ifdef USE_TCP
 	/* if clen needs to be added, add it */
 	if (clen_len){
 		/* msg->unparsed should point just before the final crlf,
 		 * parse_headers is called from clen_builder */
 		anchor=anchor_lump(&(msg->add_rm), msg->unparsed-buf, 0,
 							 HDR_CONTENTLENGTH);
 		if (anchor==0) goto error04; /* free clen_buf*/
 		if (insert_new_lump_after(anchor, clen_buf, clen_len,
 					HDR_CONTENTLENGTH)==0)
 			goto error04; /* free clen_buf*/
 	}
 #endif

 
 	/* compute new msg len and fix overlapping zones*/
 	new_len=len+lumps_len(msg->add_rm);
 
 	if (msg->new_uri.s){
 		uri_len=msg->new_uri.len;
 		new_len=new_len-msg->first_line.u.request.uri.len+uri_len;
 	}

 	new_buf=(char*)pkg_malloc(new_len+1);

 	if (new_buf==0){
 		ser_error=E_OUT_OF_MEM;
 		LOG(L_ERR, "ERROR: build_req_buf_from_sip_req: out of memory\n");

 		goto error00;

 	}
 
 	offset=s_offset=0;
 	if (msg->new_uri.s){
 		/* copy message up to uri */
 		size=msg->first_line.u.request.uri.s-buf;

 		memcpy(new_buf, buf, size);

 		offset+=size;
 		s_offset+=size;
 		/* add our uri */
 		memcpy(new_buf+offset, msg->new_uri.s, uri_len);
 		offset+=uri_len;
 		s_offset+=msg->first_line.u.request.uri.len; /* skip original uri */
 	}
 	new_buf[new_len]=0;

 	/* copy msg adding/removing lumps */
 	process_lumps(msg->add_rm, new_buf, &offset, buf, &s_offset);
 	/* copy the rest of the message */
 	memcpy(new_buf+offset, buf+s_offset, len-s_offset);

 	new_buf[new_len]=0;
 

 #ifdef DBG_MSG_QA
 	if (new_buf[new_len-1]==0) {
 		LOG(L_ERR, "ERROR: build_req_buf_from_sip_req: 0 in the end\n");
 		abort();
 	}
 #endif
 

 	*returned_len=new_len;
 	return new_buf;
 

 error01:
 	pkg_free(line_buf);

 #ifdef USE_TCP
 	if (id_buf) pkg_free(id_buf);
 #endif

 error02:

 	if (received_buf) pkg_free(received_buf);

 error03:
 	if (rport_buf) pkg_free(rport_buf);

 #ifdef USE_TCP
 error04:
 	if (clen_buf) pkg_free(clen_buf);
 #endif

 error00:

 	*returned_len=0;
 	return 0;
 }
 
 

 char * build_res_buf_from_sip_res( struct sip_msg* msg,
 				unsigned int *returned_len)

 {

 	unsigned int new_len, via_len;

 	char* new_buf;

 	unsigned offset, s_offset, via_offset;

 	char* buf;
 	unsigned int len;

 #ifdef USE_TCP
 	struct lump* anchor;
 	char* clen_buf;

 	unsigned int clen_len;

 	
 	clen_buf=0;
 	clen_len=0;

 #endif

 	buf=msg->buf;
 	len=msg->len;
 	new_buf=0;
 	/* we must remove the first via */

 	if (msg->via1->next) {
 		via_len=msg->via1->bsize;
 		via_offset=msg->h_via1->body.s-buf;
 	} else {
 		via_len=msg->h_via1->len;
 		via_offset=msg->h_via1->name.s-buf;
 	}

 
 #ifdef USE_TCP
 
 	/* if sending proto == tcp, check if Content-Length needs to be added*/
 	if (msg->via2 && (msg->via2->proto==PROTO_TCP)){
 		DBG("build_res_from_sip_res: checking content-length for \n%.*s\n",
 				(int)msg->len, msg->buf);
 		/* first of all parse content-length */
 		if (parse_headers(msg, HDR_CONTENTLENGTH, 0)==-1){
 			LOG(L_ERR, "build_res_buf_from_sip_res:"
 							" error parsing content-length\n");
 			goto skip_clen;
 		}
 		if (msg->content_length==0){
 			DBG("build_res_from_sip_res: no content_length hdr found\n");
 			/* we need to add it */
 			if ((clen_buf=clen_builder(msg, &clen_len))==0){
 				LOG(L_ERR, "build_res_buf_from_sip_res:" 
 								" clen_builder failed\n");
 				goto skip_clen;
 			}
 		}
 	}
 skip_clen:
 #endif
 	

 	/* remove the first via*/

 	if (del_lump( &(msg->repl_add_rm), via_offset, via_len, HDR_VIA)==0){

 		LOG(L_ERR, "build_res_buf_from_sip_res: error trying to remove first"
 					"via\n");
 		goto error;
 	}

 #ifdef USE_TCP
 	/* if clen needs to be added, add it */
 	if (clen_len){
 		/* msg->unparsed should point just before the final crlf,
 		 * parse_headers is called from clen_builder */
 		anchor=anchor_lump(&(msg->repl_add_rm), msg->unparsed-buf, 0, 
 							HDR_CONTENTLENGTH);
 		DBG("build_res_from_sip_res: adding content-length: %.*s\n",

 				(int)clen_len, clen_buf);

 		if (anchor==0) goto error_clen; /* free clen_buf*/
 		if (insert_new_lump_after(anchor, clen_buf, clen_len,
 					HDR_CONTENTLENGTH)==0)
 			goto error_clen; /* free clen_buf*/
 	}
 #endif

 	new_len=len+lumps_len(msg->repl_add_rm);

 
 	DBG(" old size: %d, new size: %d\n", len, new_len);

 	new_buf=(char*)pkg_malloc(new_len+1); /* +1 is for debugging 
 											 (\0 to print it )*/

 	if (new_buf==0){

 		LOG(L_ERR, "ERROR: build_res_buf_from_sip_res: out of mem\n");

 		goto error;
 	}
 	new_buf[new_len]=0; /* debug: print the message */

 	offset=s_offset=0;

 	process_lumps(msg->repl_add_rm, new_buf, &offset, 
 		buf,
 		&s_offset);

 	/* copy the rest of the message */

 	memcpy(new_buf+offset,
 		buf+s_offset, 
 		len-s_offset);

 	 /* send it! */

 	DBG("build_res_from_sip_res: copied size: orig:%d, new: %d, rest: %d"
 			" msg=\n%s\n", s_offset, offset, len-s_offset, new_buf);

 
 	*returned_len=new_len;
 	return new_buf;

 #ifdef USE_TCP
 error_clen:
 	if (clen_buf) pkg_free(clen_buf);
 #endif

 error:
 	*returned_len=0;
 	return 0;
 }
 
 

 char * build_res_buf_from_sip_req( unsigned int code, char *text,
 					char *new_tag, unsigned int new_tag_len,

 					struct sip_msg* msg, unsigned int *returned_len,
 					struct bookmark *bmark)

 {
     return build_res_buf_with_body_from_sip_req(code,text,new_tag,new_tag_len,
 						0,0, /* no body */
 						0,0, /* no content type */

 						msg,returned_len, bmark);

 }
 
 char * build_res_buf_with_body_from_sip_req( unsigned int code, char *text ,
 					     char *new_tag, unsigned int new_tag_len ,
 					     char *body, unsigned int body_len,
 					     char *content_type, unsigned int content_type_len,

 					     struct sip_msg* msg, unsigned int *returned_len,
 						 struct bookmark *bmark)

 {

 	char              *buf, *p;
 	unsigned int      len,foo;

 	struct hdr_field  *hdr;

 	struct lump_rpl   *lump;
 	int               i;

 	char              backup;
 	char              *received_buf;

 	char              *rport_buf;

 	unsigned int      received_len;
 	unsigned int      rport_len;
 	unsigned int      delete_len;

 	char              *warning;
 	unsigned int      warning_len;

 	unsigned int	  text_len;

 	int r;

 	int content_len_len;

 	char *content_len;

 	char *after_body;

 	str to_tag;

 	char *totags;

 	received_buf=0;
 	received_len=0;

 	rport_buf=0;
 	rport_len=0;

 	delete_len=0;

 	buf=0;

 	/* make -Wall happy */
 	warning=0;

 	content_len=0;

 	text_len=strlen(text);
 

 	/* force parsing all headers -- we want to return all
 	Via's in the reply and they may be scattered down to the
 	end of header (non-block Vias are a really poor property
 	of SIP :( ) */

 	if (parse_headers( msg, HDR_EOH, 0 )==-1) {
 		LOG(L_ERR, "ERROR: build_res_buf_from_sip_req: "
 			"alas, parse_headers failed\n");
 		goto error00;
 	}

 	/* check if received needs to be added */
 	backup = msg->via1->host.s[msg->via1->host.len];
 	msg->via1->host.s[msg->via1->host.len] = 0;

 	r=check_via_address(&msg->rcv.src_ip, &msg->via1->host, 
 		msg->via1->port, received_dns);

 	msg->via1->host.s[msg->via1->host.len] = backup;

 	if (r!=0) {
 		if ((received_buf=received_builder(msg,&received_len))==0) {
 			LOG(L_ERR, "ERROR: build_res_buf_from_sip_req: "
 				"alas, received_builder failed\n");
 			goto error00;
 		}
 	}

 	/* check if rport needs to be updated */
 	if (msg->via1->rport && msg->via1->rport->value.s==0){
 		if ((rport_buf=rport_builder(msg, &rport_len))==0){
 			LOG(L_ERR, "ERROR: build_res_buf_from_sip_req:"
 							" rport_builder failed\n");
 			goto error01; /* free everything */
 		}

 		delete_len=msg->via1->rport->size+1; /* include ';' */

 	}

 	/*computes the lenght of the new response buffer*/
 	len = 0;
 	/* first line */

 	len += SIP_VERSION_LEN + 1/*space*/ + 3/*code*/ + 1/*space*/ +

 		text_len + CRLF_LEN/*new line*/;

 	/*headers that will be copied (TO, FROM, CSEQ,CALLID,VIA)*/

 	for ( hdr=msg->headers ; hdr ; hdr=hdr->next ) {
 		if (hdr->type==HDR_TO) {
 			if (new_tag)
 			{
 				to_tag=get_to(msg)->tag_value;
 				if (to_tag.s )
 					len+=new_tag_len-to_tag.len;
 				else

 					len+=new_tag_len+TOTAG_TOKEN_LEN/*";tag="*/;

 			}

 			else {
 				len+=hdr->len;
 				continue;
 			}

 		} else if (hdr->type==HDR_VIA) {

 				/* we always add CRLF to via*/
 				len+=(hdr->body.s+hdr->body.len)-hdr->name.s+CRLF_LEN;

 				if (hdr==msg->h_via1) len += received_len+rport_len;

 				continue;

 		} else if (hdr->type==HDR_RECORDROUTE) {
 				/* RR only for 1xx and 2xx replies */
 				if (code<180 || code>=300) continue;
 		} else if (!(hdr->type==HDR_FROM 
 					|| hdr->type==HDR_CALLID
 					|| hdr->type==HDR_CSEQ)) {
 			continue;

 		}

 		len += hdr->len; /* we keep the original termination for these 
 							headers*/

 	}

 	len-=delete_len;

 	/*lumps length*/
 	for(lump=msg->reply_lump;lump;lump=lump->next)
 		len += lump->text.len;

 	if (server_signature) {
 		/*server header*/
 		len += SERVER_HDR_LEN + CRLF_LEN;

 	}
 
 	if (body_len) {
 		content_len=int2str(body_len, &content_len_len);
 		len += CONTENT_LENGTH_LEN + content_len_len + CRLF_LEN;
 	    len += body_len;
 	} else {

 		len +=CONTENT_LENGTH_LEN+1 + CRLF_LEN;

 	}

 	if(content_type_len) {

 	    len += content_type_len + CRLF_LEN;

 	}
 

 	if (sip_warning) {
 		warning = warning_builder(msg,&warning_len);

 		if (warning) len += warning_len + CRLF_LEN;
 		else LOG(L_WARN, "WARNING: warning skipped -- too big\n");

 	}

 	/* end of message */

 	len += CRLF_LEN; /*new line*/

 	/*allocating mem*/

 	buf = (char*) pkg_malloc( len+1 );

 	if (!buf)
 	{

 		LOG(L_ERR, "ERROR: build_res_buf_from_sip_req: out of memory "
 			" ; needs %d\n",len);

 		goto error01;

 	}
 
 	/* filling the buffer*/

 	p=buf;

 	/* first line */

 	memcpy( p , SIP_VERSION , SIP_VERSION_LEN );
 	p += SIP_VERSION_LEN;
 	*(p++) = ' ' ;
 	/*code*/

 	for ( i=2 , foo = code  ;  i>=0  ;  i-- , foo=foo/10 )

 		*(p+i) = '0' + foo - ( foo/10 )*10;

 	p += 3;
 	*(p++) = ' ' ;

 	memcpy( p , text , text_len );
 	p += text_len;

 	memcpy( p, CRLF, CRLF_LEN );
 	p+=CRLF_LEN;

 	/* headers*/
 	for ( hdr=msg->headers ; hdr ; hdr=hdr->next )

 		switch (hdr->type)

 		{

 			case HDR_VIA:

 				if (hdr==msg->h_via1){
 					if (rport_buf){
 						/* copy until rport */
 						append_str_trans( p, hdr->name.s ,

 							msg->via1->rport->start-hdr->name.s-1,msg);

 						/* copy new rport */

 						append_str(p, rport_buf, rport_len);

 						/* copy the rest of the via */

 						append_str_trans(p, msg->via1->rport->start+

 											msg->via1->rport->size, 
 											hdr->body.s+hdr->body.len-

 											msg->via1->rport->start-

 											msg->via1->rport->size, msg);
 					}else{
 						/* normal whole via copy */

 						append_str_trans( p, hdr->name.s , 
 								(hdr->body.s+hdr->body.len)-hdr->name.s, msg);

 					}
 					if (received_buf)

 						append_str( p, received_buf, received_len);

 				}else{
 					/* normal whole via copy */

 					append_str_trans( p, hdr->name.s,
 							(hdr->body.s+hdr->body.len)-hdr->name.s, msg);

 				}

 				append_str( p, CRLF,CRLF_LEN);

 				break;

 			case HDR_RECORDROUTE:
 				/* RR only for 1xx and 2xx replies */
 				if (code<180 || code>=300) break;

 				append_str(p, hdr->name.s, hdr->len);
 				break;

 			case HDR_TO:
 				if (new_tag){
 					if (to_tag.s ) { /* replacement */
 						/* before to-tag */
 						append_str( p, hdr->name.s, to_tag.s-hdr->name.s);
 						/* to tag replacement */

 						bmark->to_tag_val.s=p;
 						bmark->to_tag_val.len=new_tag_len;

 						append_str( p, new_tag,new_tag_len);
 						/* the rest after to-tag */
 						append_str( p, to_tag.s+to_tag.len,
 							hdr->name.s+hdr->len-(to_tag.s+to_tag.len));
 					}else{ /* adding a new to-tag */
 						after_body=hdr->body.s+hdr->body.len;
 						append_str( p, hdr->name.s, after_body-hdr->name.s);
 						append_str(p, TOTAG_TOKEN, TOTAG_TOKEN_LEN);

 						bmark->to_tag_val.s=p;
 						bmark->to_tag_val.len=new_tag_len;

 						append_str( p, new_tag,new_tag_len);
 						append_str( p, after_body, 
 										hdr->name.s+hdr->len-after_body);
 					}
 					break;
 				} /* no new to-tag -- proceed to 1:1 copying  */

 				totags=((struct to_body*)(hdr->parsed))->tag_value.s;
 				if (totags) {
 					bmark->to_tag_val.s=p+(totags-hdr->name.s);
 					bmark->to_tag_val.len=
 							((struct to_body*)(hdr->parsed))->tag_value.len;
 				};

 			case HDR_FROM:
 			case HDR_CALLID:
 			case HDR_CSEQ:

 					append_str(p, hdr->name.s, hdr->len);

 		} /* for switch */

 	/*lumps*/
 	for(lump=msg->reply_lump;lump;lump=lump->next)
 	{
 		memcpy(p,lump->text.s,lump->text.len);
 		p += lump->text.len;
 	}

 	if (server_signature) {
 		/*server header*/
 		memcpy( p, SERVER_HDR , SERVER_HDR_LEN );
 		p+=SERVER_HDR_LEN;
 		memcpy( p, CRLF, CRLF_LEN );
 		p+=CRLF_LEN;

 	}
 	
 	if (body_len) {
 		memcpy(p, CONTENT_LENGTH, CONTENT_LENGTH_LEN );
 		p+=CONTENT_LENGTH_LEN;
 		memcpy( p, content_len, content_len_len );
 		p+=content_len_len;

 		memcpy( p, CRLF, CRLF_LEN );
 		p+=CRLF_LEN;

 	} else {
 		/* content length header*/
 		memcpy( p, CONTENT_LENGTH "0" CRLF, CONTENT_LENGTH_LEN+1+CRLF_LEN );
 		p+=CONTENT_LENGTH_LEN+1+CRLF_LEN;

 	}
 	if(content_type_len){
 	    memcpy( p, content_type, content_type_len );
 	    p+=content_type_len;
 	    memcpy( p, CRLF, CRLF_LEN );
 	    p+=CRLF_LEN;

 	}

 	if (sip_warning && warning) {

 		memcpy( p, warning, warning_len);
 		p+=warning_len;
 		memcpy( p, CRLF, CRLF_LEN);
 		p+=CRLF_LEN;
 	}

 	/*end of message*/

 	memcpy( p, CRLF, CRLF_LEN );

 	p+=CRLF_LEN;

 	if(body_len){
 	    memcpy ( p, body, body_len );
 	    p+=body_len;
 	}

 	*(p) = 0;

 	*returned_len = len;

 	DBG("build_*: len=%d, diff=%d\n", len, p-buf);
 	DBG("build_*: rport_len=%d, delete_len=%d\n", rport_len, delete_len);

 	DBG("build_*: message=\n%.*s\n", (int)len, buf);

 	/* in req2reply, received_buf is not introduced to lumps and
 	   needs to be deleted here
 	*/
 	if (received_buf) pkg_free(received_buf);

 	if (rport_buf) pkg_free(rport_buf);

 	return buf;

 
 error01:
 	if (received_buf) pkg_free(received_buf);

 	if (rport_buf) pkg_free(rport_buf);

 error00:

 	*returned_len=0;
 	return 0;

 }

 
 /* return number of chars printed or 0 if space exceeded;
    assumes buffer sace of at least MAX_BRANCH_PARAM_LEN
  */
 
 int branch_builder( unsigned int hash_index,
 	/* only either parameter useful */
 	unsigned int label, char * char_v,
 	int branch,
 	char *branch_str, int *len )
 {
 
 	char *begin;
 	int size;
 
 	/* hash id provided ... start with it */
 	size=MAX_BRANCH_PARAM_LEN;
 	begin=branch_str;
 	*len=0;

 
 	memcpy(begin, MCOOKIE, MCOOKIE_LEN );
 	size-=MCOOKIE_LEN;begin+=MCOOKIE_LEN;
 

 	if (int2reverse_hex( &begin, &size, hash_index)==-1)
 		return 0;
 
 	if (size) {
 		*begin=BRANCH_SEPARATOR;
 		begin++; size--;
 	} else return 0;
 

 	/* string with request's characteristic value ... use it ... */
 	if (char_v) {

 		if (memcpy(begin,char_v,MD5_LEN)) {
 			begin+=MD5_LEN; size-=MD5_LEN;
 		} else return 0;

 	} else { /* ... use the "label" value otherwise */
 		if (int2reverse_hex( &begin, &size, label )==-1)
 			return 0;

 	}
 
 	if (size) {
 		*begin=BRANCH_SEPARATOR;
 		begin++; size--;
 	} else return 0;
 
 	if (int2reverse_hex( &begin, &size, branch)==-1)
 		return 0;
 
 	*len=MAX_BRANCH_PARAM_LEN-size;
 	return size;
 		
 }
 
 
 char* via_builder( unsigned int *len, 
 	struct socket_info* send_sock,

 	str* branch, str* extra_params, int proto )

 {
 	unsigned int  via_len, extra_len;
 	char               *line_buf;
 	int max_len;
 
 
 	max_len=MY_VIA_LEN+send_sock->address_str.len /* space in MY_VIA */

 		+2 /* just in case it is a v6 address ... [ ] */

 		+send_sock->port_no_str.len

 		+(branch?(MY_BRANCH_LEN+branch->len):0)
 		+(extra_params?extra_params->len:0)

 		+CRLF_LEN+1;

 	line_buf=pkg_malloc( max_len );
 	if (line_buf==0){
 		ser_error=E_OUT_OF_MEM;
 		LOG(L_ERR, "ERROR: via_builder: out of memory\n");
 		return 0;
 	}
 
 	extra_len=0;
 
 	via_len=MY_VIA_LEN+send_sock->address_str.len; /*space included in MY_VIA*/
 

 	memcpy(line_buf, MY_VIA, MY_VIA_LEN-4); /* without "UPD " */
 	if (proto==PROTO_UDP)
 		memcpy(line_buf+MY_VIA_LEN-4, "UDP ", 4);
 	else if (proto==PROTO_TCP)
 		memcpy(line_buf+MY_VIA_LEN-4, "TCP ", 4);
 	else{
 		LOG(L_CRIT, "BUG: via_builder: unknown proto %d\n", proto);
 		return 0;
 	}

 #	ifdef USE_IPV6
 	if (send_sock->address.af==AF_INET6) {
 		line_buf[MY_VIA_LEN]='[';
 		line_buf[MY_VIA_LEN+1+send_sock->address_str.len]=']';
 		extra_len=1;
 		via_len+=2; /* [ ]*/
 	}
 #	endif
 	memcpy(line_buf+MY_VIA_LEN+extra_len, send_sock->address_str.s,
 		send_sock->address_str.len);
 	if (send_sock->port_no!=SIP_PORT){
 		memcpy(line_buf+via_len, send_sock->port_no_str.s,
 			 send_sock->port_no_str.len);
 		via_len+=send_sock->port_no_str.len;
 	}
 
 	/* branch parameter */

 	if (branch){
 		memcpy(line_buf+via_len, MY_BRANCH, MY_BRANCH_LEN );
 		via_len+=MY_BRANCH_LEN;
 		memcpy(line_buf+via_len, branch->s, branch->len );
 		via_len+=branch->len;
 	}
 	/* extra params  */
 	if (extra_params){
 		memcpy(line_buf+via_len, extra_params->s, extra_params->len);
 		via_len+=extra_params->len;
 	}
 	

 	memcpy(line_buf+via_len, CRLF, CRLF_LEN);
 	via_len+=CRLF_LEN;
 	line_buf[via_len]=0; /* null terminate the string*/
 
 	*len = via_len;
 	return line_buf;
 }