data_lump.c
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 /* $Id$
  *
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  *
  * 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
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  *
  * History:
  * --------
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  *  2003-01-19  support for duplication lump lists added (jiri)
  *  2003-03-31  added subst lumps -- they expand in ip addr, port a.s.o (andrei)
73eec4b2
  *  2003-04-01  added conditional lump suport functions (andrei)
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  */
 
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 #include "data_lump.h"
 #include "dprint.h"
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 #include "mem/mem.h"
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 #include "globals.h"
 #include "error.h"
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 #include <stdlib.h>
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 #include <string.h>
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 #ifdef DEBUG_DMALLOC
 #include <dmalloc.h>
 #endif
 
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 /* WARNING: all lump add/insert operations expect a pkg_malloc'ed char* 
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  * pointer the will be DEALLOCATED when the sip_msg is destroyed! */
 
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 enum lump_dir { LD_NEXT, LD_BEFORE, LD_AFTER };
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 /* adds a header to the end
  * returns  pointer on success, 0 on error */
 struct lump* append_new_lump(struct lump** list, char* new_hdr,
 							 int len, int type)
 {
 	struct lump** t;
 	struct lump* tmp;
 	
 	for (t=list;*t;t=&((*t)->next));
 
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 	tmp=pkg_malloc(sizeof(struct lump));
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 	if (tmp==0){
 		LOG(L_ERR, "ERROR: append_new_lump: out of memory\n");
 		return 0;
 	}
 		
 	memset(tmp,0,sizeof(struct lump));
 	tmp->type=type;
 	tmp->op=LUMP_ADD;
 	tmp->u.value=new_hdr;
 	tmp->len=len;
 	*t=tmp;
 	return tmp;
 }
 
 
 
 /* inserts a header to the beginning 
  * returns pointer if success, 0 on error */
 struct lump* insert_new_lump(struct lump** list, char* new_hdr,
 								int len, int type)
 {
 	struct lump* tmp;
 
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 	tmp=pkg_malloc(sizeof(struct lump));
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 	if (tmp==0){
 		LOG(L_ERR, "ERROR: insert_new_lump: out of memory\n");
 		return 0;
 	}
 	memset(tmp,0,sizeof(struct lump));
 	tmp->next=*list;
 	tmp->type=type;
 	tmp->op=LUMP_ADD;
 	tmp->u.value=new_hdr;
 	tmp->len=len;
 	*list=tmp;
 	return tmp;
 }
 
 
 
 /* inserts a  header/data lump immediately after hdr 
  * returns pointer on success, 0 on error */
 struct lump* insert_new_lump_after( struct lump* after, char* new_hdr,
 							int len, int type)
 {
 	struct lump* tmp;
 
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 	tmp=pkg_malloc(sizeof(struct lump));
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 	if (tmp==0){
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 		ser_error=E_OUT_OF_MEM;
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 		LOG(L_ERR, "ERROR: insert_new_lump_after: out of memory\n");
 		return 0;
 	}
 	memset(tmp,0,sizeof(struct lump));
 	tmp->after=after->after;
 	tmp->type=type;
 	tmp->op=LUMP_ADD;
 	tmp->u.value=new_hdr;
 	tmp->len=len;
 	after->after=tmp;
 	return tmp;
 }
 
 
 
 /* inserts a  header/data lump immediately before "before" 
  * returns pointer on success, 0 on error */
 struct lump* insert_new_lump_before( struct lump* before, char* new_hdr,
 							int len, int type)
 {
 	struct lump* tmp;
 
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 	tmp=pkg_malloc(sizeof(struct lump));
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 	if (tmp==0){
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 		ser_error=E_OUT_OF_MEM;
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 		LOG(L_ERR,"ERROR: insert_new_lump_before: out of memory\n");
 		return 0;
 	}
 	memset(tmp,0,sizeof(struct lump));
 	tmp->before=before->before;
 	tmp->type=type;
 	tmp->op=LUMP_ADD;
 	tmp->u.value=new_hdr;
 	tmp->len=len;
 	before->before=tmp;
 	return tmp;
 }
 
 
 
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 /* inserts a  subst lump immediately after hdr 
  * returns pointer on success, 0 on error */
 struct lump* insert_subst_lump_after( struct lump* after, enum lump_subst subst,
 										int type)
 {
 	struct lump* tmp;
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 	tmp=pkg_malloc(sizeof(struct lump));
 	if (tmp==0){
 		ser_error=E_OUT_OF_MEM;
 		LOG(L_ERR, "ERROR: insert_new_lump_after: out of memory\n");
 		return 0;
 	}
 	memset(tmp,0,sizeof(struct lump));
 	tmp->after=after->after;
 	tmp->type=type;
 	tmp->op=LUMP_ADD_SUBST;
 	tmp->u.subst=subst;
 	tmp->len=0;
 	after->after=tmp;
 	return tmp;
 }
 
 
 
 /* inserts a  subst lump immediately before "before" 
  * returns pointer on success, 0 on error */
 struct lump* insert_subst_lump_before(	struct lump* before, 
 										enum lump_subst subst,
 										int type)
 {
 	struct lump* tmp;
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 	tmp=pkg_malloc(sizeof(struct lump));
 	if (tmp==0){
 		ser_error=E_OUT_OF_MEM;
 		LOG(L_ERR,"ERROR: insert_new_lump_before: out of memory\n");
 		return 0;
 	}
 	memset(tmp,0,sizeof(struct lump));
 	tmp->before=before->before;
 	tmp->type=type;
 	tmp->op=LUMP_ADD_SUBST;
 	tmp->u.subst=subst;
 	tmp->len=0;
 	before->before=tmp;
 	return tmp;
 }
 
 
 
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 /* inserts a  cond lump immediately after hdr 
  * returns pointer on success, 0 on error */
 struct lump* insert_cond_lump_after( struct lump* after, enum lump_conditions c,
 										int type)
 {
 	struct lump* tmp;
 	
 	tmp=pkg_malloc(sizeof(struct lump));
 	if (tmp==0){
 		ser_error=E_OUT_OF_MEM;
 		LOG(L_ERR, "ERROR: insert_new_lump_after: out of memory\n");
 		return 0;
 	}
 	memset(tmp,0,sizeof(struct lump));
 	tmp->after=after->after;
 	tmp->type=type;
 	tmp->op=LUMP_ADD_OPT;
 	tmp->u.cond=c;
 	tmp->len=0;
 	after->after=tmp;
 	return tmp;
 }
 
 
 
 /* inserts a  conditional lump immediately before "before" 
  * returns pointer on success, 0 on error */
 struct lump* insert_cond_lump_before(	struct lump* before, 
 										enum lump_conditions c,
 										int type)
 {
 	struct lump* tmp;
 	
 	tmp=pkg_malloc(sizeof(struct lump));
 	if (tmp==0){
 		ser_error=E_OUT_OF_MEM;
 		LOG(L_ERR,"ERROR: insert_new_lump_before: out of memory\n");
 		return 0;
 	}
 	memset(tmp,0,sizeof(struct lump));
 	tmp->before=before->before;
 	tmp->type=type;
 	tmp->op=LUMP_ADD_OPT;
 	tmp->u.cond=c;
 	tmp->len=0;
 	before->before=tmp;
 	return tmp;
 }
 
 
 
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 /* removes an already existing header/data lump */
 struct lump* del_lump(struct lump** list, int offset, int len, int type)
 {
 	struct lump* tmp;
 	struct lump* prev, *t;
 
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 	tmp=pkg_malloc(sizeof(struct lump));
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 	if (tmp==0){
 		LOG(L_ERR, "ERROR: insert_new_lump_before: out of memory\n");
 		return 0;
 	}
 	memset(tmp,0,sizeof(struct lump));
 	tmp->op=LUMP_DEL;
 	tmp->type=type;
 	tmp->u.offset=offset;
 	tmp->len=len;
 	prev=0;
 	for (t=*list;t; prev=t, t=t->next){
 		/* insert it sorted after offset */
 		if (((t->op==LUMP_DEL)||(t->op==LUMP_NOP))&&(t->u.offset>offset))
 			break;
 	}
 	tmp->next=t;
 	if (prev) prev->next=tmp;
 	else *list=tmp;
 	return tmp;
 }
 
 
 
 /* add an anhor */
 struct lump* anchor_lump(struct lump** list, int offset, int len, int type)
 {
 	struct lump* tmp;
 	struct lump* prev, *t;
 
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 	tmp=pkg_malloc(sizeof(struct lump));
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 	if (tmp==0){
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 		ser_error=E_OUT_OF_MEM;
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 		LOG(L_ERR, "ERROR: insert_new_lump_before: out of memory\n");
 		return 0;
 	}
 	memset(tmp,0,sizeof(struct lump));
 	tmp->op=LUMP_NOP;
 	tmp->type=type;
 	tmp->u.offset=offset;
 	tmp->len=len;
 	prev=0;
 	for (t=*list;t; prev=t, t=t->next){
 		/* insert it sorted after offset */
 		if (((t->op==LUMP_DEL)||(t->op==LUMP_NOP))&&(t->u.offset>offset))
 			break;
 	}
 	tmp->next=t;
 	
 	if (prev) prev->next=tmp;
 	else *list=tmp;
 	return tmp;
 }
 
 
 
 void free_lump(struct lump* lmp)
 {
 	if (lmp && (lmp->op==LUMP_ADD)){
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 		if (lmp->u.value) pkg_free(lmp->u.value);
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 		lmp->u.value=0;
 		lmp->len=0;
 	}
 }
 
 
 
 void free_lump_list(struct lump* l)
 {
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 	struct lump* t, *r, *foo,*crt;
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 	t=l;
 	while(t){
 		crt=t;
 		t=t->next;
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 	/*
 		 dangerous recursive clean
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 		if (crt->before) free_lump_list(crt->before);
 		if (crt->after)  free_lump_list(crt->after);
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 	*/
 		/* no more recursion, clean after and before and that's it */
 		r=crt->before;
 		while(r){
 			foo=r; r=r->before;
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 			free_lump(foo);
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 			pkg_free(foo);
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 		}
 		r=crt->after;
 		while(r){
 			foo=r; r=r->after;
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 			free_lump(foo);
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 			pkg_free(foo);
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 		}
 		
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 		/*clean current elem*/
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 		free_lump(crt);
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 		pkg_free(crt);
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 	}
 }
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 /* free (shallow-ly) a lump and its after/before lists */
 static void free_shallow_lump( struct lump *l )
 {
 	struct lump *r, *foo;
 
 	r=l->before;
 	while(r){
 		foo=r; r=r->before;
 		pkg_free(foo);
 	}
 	r=l->after;
 	while(r){
 		foo=r; r=r->after;
 		pkg_free(foo);
 	}
 	pkg_free(l);
 }
 
 /* duplicate (shallow-ly) a lump list into pkg memory */
 static struct lump *dup_lump_list_r( struct lump *l, 
 				enum lump_dir dir, int *error)
 {
 	int deep_error;
 	struct lump *new_lump;
 
 	deep_error=0; /* optimist: assume success in recursion */
 	/* if at list end, terminate recursion successfully */
 	if (!l) { *error=0; return 0; }
 	/* otherwise duplicate current element */
 	new_lump=pkg_malloc(sizeof(struct lump));
 	if (!new_lump) { *error=1; return 0; }
 
 	memcpy(new_lump, l, sizeof(struct lump));
 	new_lump->flags=LUMPFLAG_DUPED;
 	new_lump->next=new_lump->before=new_lump->after=0;
 
 	switch(dir) {
 		case LD_NEXT:	
 				new_lump->before=dup_lump_list_r(l->before, 
 								LD_BEFORE, &deep_error);
 				if (deep_error) goto deeperror;
 				new_lump->after=dup_lump_list_r(l->after, 
 								LD_AFTER, &deep_error);
 				if (deep_error) goto deeperror;
 				new_lump->next=dup_lump_list_r(l->next, 
 								LD_NEXT, &deep_error);
 				break;
 		case LD_BEFORE:
 				new_lump->before=dup_lump_list_r(l->before, 
 								LD_BEFORE, &deep_error);
 				break;
 		case LD_AFTER:
 				new_lump->after=dup_lump_list_r(l->after, 
 								LD_AFTER, &deep_error);
 				break;
 		default:
 				LOG(L_CRIT, "BUG: dup_limp_list_r: unknown dir: "
 						"%d\n", dir );
 				deep_error=1;
 	}
 	if (deep_error) goto deeperror;
 
 	*error=0;
 	return new_lump;
 
 deeperror:
 	LOG(L_ERR, "ERROR: dup_lump_list_r: out of mem\n");
 	free_shallow_lump(new_lump);
 	*error=1;
 	return 0;
 }
 
 /* shallow pkg copy of a lump list
  *
  * if either original list empty or error occur returns, 0
  * is returned, pointer to the copy otherwise
  */
 struct lump* dup_lump_list( struct lump *l )
 {
 	int deep_error;
 
 	deep_error=0;
 	return dup_lump_list_r(l, LD_NEXT, &deep_error);
 }
 
 void free_duped_lump_list(struct lump* l)
 {
 	struct lump *r, *foo,*crt;
 	while(l){
 		crt=l;
 		l=l->next;
 
 		r=crt->before;
 		while(r){
 			foo=r; r=r->before;
 			/* (+): if a new item was introduced to the shallow-ly
 			 * duped list, remove it completely, preserve it
 			 * othewise (it is still refered by original list)
 			 */
 			if (foo->flags!=LUMPFLAG_DUPED) 
 					free_lump(foo);
 			pkg_free(foo);
 		}
 		r=crt->after;
 		while(r){
 			foo=r; r=r->after;
 			if (foo->flags!=LUMPFLAG_DUPED) /* (+) ... see above */
 				free_lump(foo);
 			pkg_free(foo);
 		}
 		
 		/*clean current elem*/
 		if (crt->flags!=LUMPFLAG_DUPED) /* (+) ... see above */
 			free_lump(crt);
 		pkg_free(crt);
 	}
 }