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/*
* $Id: lump_struct.h,v 1.3 2005/08/23 17:31:12 bogdan_iancu Exp $
*
* adding/removing headers or any other data chunk from a message
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of openser, a free SIP server.
*
* openser is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* openser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* History:
* --------
* 2003-01-29 s/int/enum ... more convenient for gdb (jiri)
* 2003-03-31 added subst lumps -- they expand in ip addr, port a.s.o (andrei)
* 2003-04-01 added opt (condition) lumps (andrei)
* 2003-04-02 added more subst lumps: SUBST_{SND,RCV}_ALL
* => ip:port;transport=proto (andrei)
* 2003-10-20 split from data_lump.h (andrei)
*
*/
#ifndef lump_struct_h
#define lump_struct_h
#include "./parser/hf.h"
enum lump_op { LUMP_NOP=0, LUMP_DEL, LUMP_ADD, LUMP_ADD_SUBST, LUMP_ADD_OPT };
enum lump_subst{ SUBST_NOP=0, /* do nothing */
SUBST_RCV_IP, SUBST_SND_IP, /* add ip address */
SUBST_RCV_PORT, SUBST_SND_PORT, /* add port no */
SUBST_RCV_PROTO, SUBST_SND_PROTO,/* add protocol(udp,tcp,tls)*/
SUBST_RCV_ALL, SUBST_SND_ALL /* ip:port;transport=proto */
};
/* Where:
SND = sending, e.g the src ip of the outgoing message
RCV = received e.g the dst ip of the original incoming msg,
or the ip of the ser socket on which the msg was received
For SUBST_{RCV,SND}_ALL, :port is added only if port!=5060
and transport=proto only if proto!=udp
*/
enum lump_conditions { COND_FALSE, /* always false */
COND_TRUE, /* always true */
COND_IF_DIFF_REALMS,/* true if RCV realm != SND realm */
COND_IF_DIFF_AF, /* true if RCV af != SND af */
COND_IF_DIFF_PROTO, /* true if RCV proto != SND proto */
COND_IF_DIFF_PORT, /* true if RCV port != SND port */
COND_IF_DIFF_IP, /* true if RCV ip != SND ip */
COND_IF_RAND /* 50-50 random prob.of being true*/
};
/* Where:
REALM= ip_addr:port:proto
af = address family (ipv4 or ipv6)
proto = protocol (tcp, udp, tls)
*/
enum lump_flag { LUMPFLAG_NONE=0, LUMPFLAG_DUPED=1,
LUMPFLAG_SHMEM=2 , LUMPFLAG_BRANCH=4};
struct lump{
enum _hdr_types_t type; /* HDR_VIA_T, HDR_OTHER_T (0), ... */
enum lump_op op; /* DEL, ADD, NOP, UNSPEC(=0) */
union{
int offset; /* used for DEL, MODIFY */
enum lump_subst subst; /*what to subst: ip addr, port, proto*/
enum lump_conditions cond; /* condition for LUMP_ADD_OPT */
char * value; /* used for ADD */
}u;
int len; /* length of this header field */
struct lump* before; /* list of headers to be inserted in front of the
current one */
struct lump* after; /* list of headers to be inserted immediately after
the current one */
struct lump* next;
enum lump_flag flags; /* additional hints for use from TM's shmem */
};
/*
* hdrs must be kept sorted after their offset (DEL, NOP, UNSPEC)
* and/or their position (ADD). E.g.:
* - to delete header Z insert it in to the list according to its offset
* and with op=DELETE
* - if you want to add a new header X after a header Y, insert Y in the list
* with op NOP and after it X (op ADD).
* - if you want X before Y, insert X in Y's before list.
* - if you want X to be the first header just put it first in hdr_lst.
* -if you want to replace Y with X, insert Y with op=DELETE and then X with
* op=ADD.
* before and after must contain only ADD ops!
*
* Difference between "after" & "next" when Adding:
* "after" forces the new header immediately after the current one while
* "next" means another header can be inserted between them.
*
*/
/* frees the content of a lump struct */
void free_lump(struct lump* l);
/*frees an entire lump list, recursively */
void free_lump_list(struct lump* lump_list);
#endif
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