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/* $OpenBSD: name2id.c,v 1.10 2018/06/29 11:45:50 claudio Exp $ */
/*
* Copyright (c) 2004, 2005 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <net/route.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "bgpd.h"
#define IDVAL_MAX 50000
struct n2id_label {
TAILQ_ENTRY(n2id_label) entry;
char *name;
u_int16_t id;
int ref;
};
TAILQ_HEAD(n2id_labels, n2id_label);
u_int16_t _name2id(struct n2id_labels *, const char *);
const char *_id2name(struct n2id_labels *, u_int16_t);
void _unref(struct n2id_labels *, u_int16_t);
u_int16_t _ref(struct n2id_labels *, u_int16_t);
struct n2id_labels rt_labels = TAILQ_HEAD_INITIALIZER(rt_labels);
struct n2id_labels pftable_labels = TAILQ_HEAD_INITIALIZER(pftable_labels);
u_int16_t
rtlabel_name2id(const char *name)
{
return (_name2id(&rt_labels, name));
}
const char *
rtlabel_id2name(u_int16_t id)
{
return (_id2name(&rt_labels, id));
}
void
rtlabel_unref(u_int16_t id)
{
_unref(&rt_labels, id);
}
u_int16_t
rtlabel_ref(u_int16_t id)
{
return (_ref(&rt_labels, id));
}
u_int16_t
pftable_name2id(const char *name)
{
return (_name2id(&pftable_labels, name));
}
const char *
pftable_id2name(u_int16_t id)
{
return (_id2name(&pftable_labels, id));
}
void
pftable_unref(u_int16_t id)
{
_unref(&pftable_labels, id);
}
u_int16_t
pftable_ref(u_int16_t id)
{
return (_ref(&pftable_labels, id));
}
u_int16_t
_name2id(struct n2id_labels *head, const char *name)
{
struct n2id_label *label, *p = NULL;
u_int16_t new_id = 1;
if (!name[0]) {
errno = EINVAL;
return (0);
}
TAILQ_FOREACH(label, head, entry)
if (strcmp(name, label->name) == 0) {
label->ref++;
return (label->id);
}
/*
* to avoid fragmentation, we do a linear search from the beginning
* and take the first free slot we find. if there is none or the list
* is empty, append a new entry at the end.
*/
if (!TAILQ_EMPTY(head))
for (p = TAILQ_FIRST(head); p != NULL &&
p->id == new_id; p = TAILQ_NEXT(p, entry))
new_id = p->id + 1;
if (new_id > IDVAL_MAX) {
errno = ERANGE;
return (0);
}
if ((label = calloc(1, sizeof(struct n2id_label))) == NULL)
return (0);
if ((label->name = strdup(name)) == NULL) {
free(label);
return (0);
}
label->id = new_id;
label->ref++;
if (p != NULL) /* insert new entry before p */
TAILQ_INSERT_BEFORE(p, label, entry);
else /* either list empty or no free slot in between */
TAILQ_INSERT_TAIL(head, label, entry);
return (label->id);
}
const char *
_id2name(struct n2id_labels *head, u_int16_t id)
{
struct n2id_label *label;
if (id == 0)
return ("");
TAILQ_FOREACH(label, head, entry)
if (label->id == id)
return (label->name);
return ("");
}
void
_unref(struct n2id_labels *head, u_int16_t id)
{
struct n2id_label *p, *next;
if (id == 0)
return;
for (p = TAILQ_FIRST(head); p != NULL; p = next) {
next = TAILQ_NEXT(p, entry);
if (id == p->id) {
if (--p->ref == 0) {
TAILQ_REMOVE(head, p, entry);
free(p->name);
free(p);
}
break;
}
}
}
u_int16_t
_ref(struct n2id_labels *head, u_int16_t id)
{
struct n2id_label *label;
if (id == 0)
return (0);
TAILQ_FOREACH(label, head, entry)
if (label->id == id) {
++label->ref;
return (id);
}
/* id not found, treat like no id */
return (0);
}
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