usr_avp.c
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 /*
  * $Id$
  *
  * 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:
  * ---------
  *  2004-07-21  created (bogdan)
  */
 
 
 #include <assert.h>
 
 #include "sr_module.h"
 #include "dprint.h"
 #include "str.h"
 #include "ut.h"
 #include "mem/shm_mem.h"
 #include "usr_avp.h"
 
 
 
 struct str_int_data {
 	str  name;
 	int  val;
 };
 
 struct str_str_data {
 	str  name;
 	str  val;
 };
 
 
 static struct usr_avp *global_avps = 0;
 static struct usr_avp **crt_avps  = &global_avps;
 
 
 
 inline static unsigned short compute_ID( str *name )
 {
 	char *p;
 	unsigned short id;
 
 	id=0;
 	for( p=name->s+name->len-1 ; p>=name->s ; p-- )
 		id ^= *p;
 	return id;
 }
 
 
 int add_avp(unsigned short flags, int_str name, int_str val)
 {
 	struct usr_avp *avp;
 	str *s;
 	struct str_int_data *sid;
 	struct str_str_data *ssd;
 	int len;
 
 	assert( crt_avps!=0 );
 
 	/* compute the required mem size */
 	len = sizeof(struct usr_avp);
 	if (flags&AVP_NAME_STR) {
 		if (flags&AVP_VAL_STR)
 			len += sizeof(struct str_str_data)-sizeof(void*) + name.s->len
 				+ val.s->len;
 		else
 			len += sizeof(struct str_int_data)-sizeof(void*) + name.s->len;
 	} else if (flags&AVP_VAL_STR)
 			len += sizeof(str)-sizeof(void*) + val.s->len;
 
 	avp = (struct usr_avp*)shm_malloc( len );
 	if (avp==0) {
 		LOG(L_ERR,"ERROR:avp:add_avp: no more shm mem\n");
 		goto error;
 	}
 
 	avp->flags = flags;
 	avp->id = (flags&AVP_NAME_STR)? compute_ID(name.s) : name.n ;
 
 	avp->next = *crt_avps;
 	*crt_avps = avp;
 
 	switch ( flags&(AVP_NAME_STR|AVP_VAL_STR) )
 	{
 		case 0:
 			/* avp type ID, int value */
 			avp->data = (void*)val.n;
 			break;
 		case AVP_NAME_STR:
 			/* avp type str, int value */
 			sid = (struct str_int_data*)&(avp->data);
 			sid->val = val.n;
 			sid->name.len =name.s->len;
 			sid->name.s = (char*)sid + sizeof(struct str_int_data);
 			memcpy( sid->name.s , name.s->s, name.s->len);
 			break;
 		case AVP_VAL_STR:
 			/* avp type ID, str value */
 			s = (str*)&(avp->data);
 			s->len = val.s->len;
 			s->s = (char*)s + sizeof(str);
 			memcpy( s->s, val.s->s , s->len);
 			break;
 		case AVP_NAME_STR|AVP_VAL_STR:
 			/* avp type str, str value */
 			ssd = (struct str_str_data*)&(avp->data);
 			ssd->name.len = name.s->len;
 			ssd->name.s = (char*)ssd + sizeof(struct str_str_data);
 			memcpy( ssd->name.s , name.s->s, name.s->len);
 			ssd->val.len = val.s->len;
 			ssd->val.s = ssd->name.s + ssd->name.len;
 			memcpy( ssd->val.s , val.s->s, val.s->len);
 			break;
 	}
 
 	return 0;
 error:
 	return -1;
 }
 
 
 inline static str* get_avp_name(struct usr_avp *avp)
 {
 	switch ( avp->flags&(AVP_NAME_STR|AVP_VAL_STR) )
 	{
 		case 0:
 			/* avp type ID, int value */
 		case AVP_VAL_STR:
 			/* avp type ID, str value */
 			return 0;
 		case AVP_NAME_STR:
 			/* avp type str, int value */
 			return &((struct str_int_data*)&avp->data)->name;
 		case AVP_NAME_STR|AVP_VAL_STR:
 			/* avp type str, str value */
 			return &((struct str_str_data*)&avp->data)->name;
 	}
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 	LOG(L_ERR,"BUG:avp:get_avp_name: unknown avp type (name&val) %d\n",
 		avp->flags&(AVP_NAME_STR|AVP_VAL_STR));
 	return 0;
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 }
 
 
 /* get value functions */
 
 inline void get_avp_val(struct usr_avp *avp, int_str *val)
 {
 	if (avp==0 || val==0)
 		return;
 
 	switch ( avp->flags&(AVP_NAME_STR|AVP_VAL_STR) ) {
 		case 0:
 			/* avp type ID, int value */
 			val->n = (int)(avp->data);
 			break;
 		case AVP_NAME_STR:
 			/* avp type str, int value */
 			val->n = ((struct str_int_data*)(&avp->data))->val;
 			break;
 		case AVP_VAL_STR:
 			/* avp type ID, str value */
 			val->s = (str*)(&avp->data);
 			break;
 		case AVP_NAME_STR|AVP_VAL_STR:
 			/* avp type str, str value */
 			val->s = &(((struct str_str_data*)(&avp->data))->val);
 			break;
 	}
 }
 
 
 
 
 /* seach functions */
 
 inline static struct usr_avp *internal_search_ID_avp( struct usr_avp *avp,
 												unsigned short id)
 {
 	for( ; avp ; avp=avp->next ) {
 		if ( id==avp->id && (avp->flags&AVP_NAME_STR)==0  ) {
 			return avp;
 		}
 	}
 	return 0;
 }
 
 
 
 inline static struct usr_avp *internal_search_name_avp( struct usr_avp *avp,
 												unsigned short id, str *name)
 {
 	str * avp_name;
 
 	for( ; avp ; avp=avp->next )
 		if ( id==avp->id && avp->flags&AVP_NAME_STR &&
 		(avp_name=get_avp_name(avp))!=0 && avp_name->len==name->len
 		 && !strncasecmp( avp_name->s, name->s, name->len) ) {
 			return avp;
 		}
 	return 0;
 }
 
 
 
 struct usr_avp *search_first_avp( unsigned short name_type,
 										int_str name, int_str *val)
 {
 	struct usr_avp *avp;
 
 	assert( crt_avps!=0 );
 	
 	if (*crt_avps==0)
 		return 0;
 
 	/* search for the AVP by ID (&name) */
 	if (name_type&AVP_NAME_STR)
 		avp = internal_search_name_avp(*crt_avps,compute_ID(name.s),name.s);
 	else
 		avp = internal_search_ID_avp( *crt_avps, name.n );
 
 	/* get the value - if required */
 	if (avp && val)
 		get_avp_val(avp, val);
 
 	return avp;
 }
 
 
 
 struct usr_avp *search_next_avp( struct usr_avp *avp,  int_str *val )
 {
 	if (avp==0 || (avp=avp->next)==0)
 		return 0;
 
 	if (avp->flags&AVP_NAME_STR)
 		avp = internal_search_name_avp( avp, avp->id, get_avp_name(avp));
 	else
 		avp = internal_search_ID_avp( avp, avp->id );
 
 	if (avp && val)
 		get_avp_val(avp, val);
 
 	return avp;
 }
 
 
 
 
 /********* free functions ********/
 
 void destroy_avp( struct usr_avp *avp_del)
 {
 	struct usr_avp *avp;
 	struct usr_avp *avp_prev;
 
 	for( avp_prev=0,avp=*crt_avps ; avp ; avp_prev=avp,avp=avp->next ) {
 		if (avp==avp_del) {
 			if (avp_prev)
 				avp_prev->next=avp->next;
 			else
 				*crt_avps = avp->next;
 			shm_free(avp);
 			return;
 		}
 	}
 }
 
 
 void destroy_avp_list_unsafe( struct usr_avp **list )
 {
 	struct usr_avp *avp, *foo;
 
 	avp = *list;
 	while( avp ) {
 		foo = avp;
 		avp = avp->next;
 		shm_free_unsafe( foo );
 	}
 	*list = 0;
 }
 
 
 inline void destroy_avp_list( struct usr_avp **list )
 {
 	struct usr_avp *avp, *foo;
 
 	DBG("DEBUG:destroy_avp_list: destroing list %p\n",*list);
 	avp = *list;
 	while( avp ) {
 		foo = avp;
 		avp = avp->next;
 		shm_free( foo );
 	}
 	*list = 0;
 }
 
 
 void reset_avps( )
 {
 	assert( crt_avps!=0 );
 	
 	if ( crt_avps!=&global_avps) {
 		crt_avps = &global_avps;
 	}
 	destroy_avp_list( crt_avps );
 }
 
 
 
 struct usr_avp** set_avp_list( struct usr_avp **list )
 {
 	struct usr_avp **foo;
 	
 	assert( crt_avps!=0 );
 
 	foo = crt_avps;
 	crt_avps = list;
 	return foo;
 }