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134 lines
4.9 KiB
134 lines
4.9 KiB
/*
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* $Id$
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*
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* adding/removing headers or any other data chunk from a message
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*
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* Copyright (C) 2001-2003 FhG Fokus
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*
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* This file is part of ser, a free SIP server.
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*
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* ser is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version
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*
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* For a license to use the ser software under conditions
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* other than those described here, or to purchase support for this
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* software, please contact iptel.org by e-mail at the following addresses:
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* info@iptel.org
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*
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* ser is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* History:
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* --------
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* 2003-01-29 s/int/enum ... more convenient for gdb (jiri)
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* 2003-03-31 added subst lumps -- they expand in ip addr, port a.s.o (andrei)
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* 2003-04-01 added opt (condition) lumps (andrei)
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* 2003-04-02 added more subst lumps: SUBST_{SND,RCV}_ALL
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* => ip:port;transport=proto (andrei)
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* 2003-10-20 split from data_lump.h (andrei)
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* 2005-03-24 the type of type attribute changed to enum _hdr_types_t (janakj)
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*
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*/
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#ifndef lump_struct_h
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#define lump_struct_h
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#include "./parser/hf.h"
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enum lump_op { LUMP_NOP=0, LUMP_DEL, LUMP_ADD, LUMP_ADD_SUBST, LUMP_ADD_OPT };
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enum lump_subst{ SUBST_NOP=0, /* do nothing */
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SUBST_RCV_IP, SUBST_SND_IP, /* add ip address */
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SUBST_RCV_PORT, SUBST_SND_PORT, /* add port no */
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SUBST_RCV_PROTO, SUBST_SND_PROTO,/* add protocol(udp,tcp,tls)*/
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SUBST_RCV_ALL, SUBST_SND_ALL /* ip:port;transport=proto */
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};
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/* Where:
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SND = sending, e.g the src ip of the outgoing message
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RCV = received e.g the dst ip of the original incoming msg,
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or the ip of the ser socket on which the msg was received
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For SUBST_{RCV,SND}_ALL, :port is added only if port!=5060
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and transport=proto only if proto!=udp
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*/
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enum lump_conditions { COND_FALSE, /* always false */
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COND_TRUE, /* always true */
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COND_IF_DIFF_REALMS,/* true if RCV realm != SND realm */
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COND_IF_DIFF_AF, /* true if RCV af != SND af */
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COND_IF_DIFF_PROTO, /* true if RCV proto != SND proto */
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COND_IF_DIFF_PORT, /* true if RCV port != SND port */
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COND_IF_DIFF_IP, /* true if RCV ip != SND ip */
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COND_IF_RAND /* 50-50 random prob.of being true*/
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};
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/* Where:
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REALM= ip_addr:port:proto
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af = address family (ipv4 or ipv6)
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proto = protocol (tcp, udp, tls)
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*/
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enum lump_flag { LUMPFLAG_NONE=0, LUMPFLAG_DUPED=1, LUMPFLAG_SHMEM=2,
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LUMPFLAG_BRANCH=4, LUMPFLAG_COND_TRUE=8 };
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#define LUMP_SET_COND_TRUE(_lump) (_lump)->flags |= LUMPFLAG_COND_TRUE
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#define LUMP_IS_COND_TRUE(_lump) ((_lump)->flags & LUMPFLAG_COND_TRUE)
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struct lump{
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enum _hdr_types_t type; /* HDR_VIA_T, HDR_OTHER_T (0), ... */
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enum lump_op op; /* DEL, ADD, NOP, UNSPEC(=0) */
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union{
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int offset; /* used for DEL, MODIFY */
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enum lump_subst subst; /*what to subst: ip addr, port, proto*/
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enum lump_conditions cond; /* condition for LUMP_ADD_OPT */
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char * value; /* used for ADD */
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}u;
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int len; /* length of this header field */
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struct lump* before; /* list of headers to be inserted in front of the
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current one */
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struct lump* after; /* list of headers to be inserted immediately after
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the current one */
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struct lump* next;
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enum lump_flag flags; /* additional hints for use from TM's shmem */
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};
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/*
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* hdrs must be kept sorted after their offset (DEL, NOP, UNSPEC)
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* and/or their position (ADD). E.g.:
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* - to delete header Z insert it in to the list according to its offset
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* and with op=DELETE
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* - if you want to add a new header X after a header Y, insert Y in the list
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* with op NOP and after it X (op ADD).
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* - if you want X before Y, insert X in Y's before list.
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* - if you want X to be the first header just put it first in hdr_lst.
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* -if you want to replace Y with X, insert Y with op=DELETE and then X with
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* op=ADD.
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* before and after must contain only ADD ops!
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*
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* Difference between "after" & "next" when Adding:
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* "after" forces the new header immediately after the current one while
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* "next" means another header can be inserted between them.
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*
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*/
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/* frees the content of a lump struct */
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void free_lump(struct lump* l);
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/* frees an entire lump list, recursively */
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void free_lump_list(struct lump* lump_list);
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/* count applied lumps in a list having a specific type */
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unsigned int count_applied_lumps(struct lump *ll, int type);
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#endif
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