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/*
* services/view.c - named views containing local zones authority service.
*
* Copyright (c) 2016, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains functions to enable named views that can hold local zone
* authority service.
*/
#include "config.h"
#include "services/view.h"
#include "services/localzone.h"
#include "util/config_file.h"
int
view_cmp(const void* v1, const void* v2)
{
struct view* a = (struct view*)v1;
struct view* b = (struct view*)v2;
return strcmp(a->name, b->name);
}
struct views*
views_create(void)
{
struct views* v = (struct views*)calloc(1,
sizeof(*v));
if(!v)
return NULL;
rbtree_init(&v->vtree, &view_cmp);
lock_rw_init(&v->lock);
lock_protect(&v->lock, &v->vtree, sizeof(v->vtree));
return v;
}
/** This prototype is defined in in respip.h, but we want to avoid
* unnecessary dependencies */
void respip_set_delete(struct respip_set *set);
void
view_delete(struct view* v)
{
if(!v)
return;
lock_rw_destroy(&v->lock);
local_zones_delete(v->local_zones);
respip_set_delete(v->respip_set);
free(v->name);
free(v);
}
static void
delviewnode(rbnode_type* n, void* ATTR_UNUSED(arg))
{
struct view* v = (struct view*)n;
view_delete(v);
}
void
views_delete(struct views* v)
{
if(!v)
return;
lock_rw_destroy(&v->lock);
traverse_postorder(&v->vtree, delviewnode, NULL);
free(v);
}
/** create a new view */
static struct view*
view_create(char* name)
{
struct view* v = (struct view*)calloc(1, sizeof(*v));
if(!v)
return NULL;
v->node.key = v;
if(!(v->name = strdup(name))) {
free(v);
return NULL;
}
lock_rw_init(&v->lock);
lock_protect(&v->lock, &v->name, sizeof(*v)-sizeof(rbnode_type));
return v;
}
/** enter a new view returns with WRlock */
static struct view*
views_enter_view_name(struct views* vs, char* name)
{
struct view* v = view_create(name);
if(!v) {
log_err("out of memory");
return NULL;
}
/* add to rbtree */
lock_rw_wrlock(&vs->lock);
lock_rw_wrlock(&v->lock);
if(!rbtree_insert(&vs->vtree, &v->node)) {
log_warn("duplicate view: %s", name);
lock_rw_unlock(&v->lock);
view_delete(v);
lock_rw_unlock(&vs->lock);
return NULL;
}
lock_rw_unlock(&vs->lock);
return v;
}
int
views_apply_cfg(struct views* vs, struct config_file* cfg)
{
struct config_view* cv;
struct view* v;
struct config_file lz_cfg;
/* Check existence of name in first view (last in config). Rest of
* views are already checked when parsing config. */
if(cfg->views && !cfg->views->name) {
log_err("view without a name");
return 0;
}
for(cv = cfg->views; cv; cv = cv->next) {
/* create and enter view */
if(!(v = views_enter_view_name(vs, cv->name)))
return 0;
v->isfirst = cv->isfirst;
if(cv->local_zones || cv->local_data) {
if(!(v->local_zones = local_zones_create())){
lock_rw_unlock(&v->lock);
return 0;
}
memset(&lz_cfg, 0, sizeof(lz_cfg));
lz_cfg.local_zones = cv->local_zones;
lz_cfg.local_data = cv->local_data;
lz_cfg.local_zones_nodefault =
cv->local_zones_nodefault;
if(v->isfirst) {
/* Do not add defaults to view-specific
* local-zone when global local zone will be
* used. */
struct config_strlist* nd;
lz_cfg.local_zones_disable_default = 1;
/* Add nodefault zones to list of zones to add,
* so they will be used as if they are
* configured as type transparent */
for(nd = cv->local_zones_nodefault; nd;
nd = nd->next) {
char* nd_str, *nd_type;
nd_str = strdup(nd->str);
if(!nd_str) {
log_err("out of memory");
lock_rw_unlock(&v->lock);
return 0;
}
nd_type = strdup("nodefault");
if(!nd_type) {
log_err("out of memory");
free(nd_str);
lock_rw_unlock(&v->lock);
return 0;
}
if(!cfg_str2list_insert(
&lz_cfg.local_zones, nd_str,
nd_type)) {
log_err("failed to insert "
"default zones into "
"local-zone list");
lock_rw_unlock(&v->lock);
return 0;
}
}
}
if(!local_zones_apply_cfg(v->local_zones, &lz_cfg)){
lock_rw_unlock(&v->lock);
return 0;
}
/* local_zones, local_zones_nodefault and local_data
* are free'd from config_view by local_zones_apply_cfg.
* Set pointers to NULL. */
cv->local_zones = NULL;
cv->local_data = NULL;
cv->local_zones_nodefault = NULL;
}
lock_rw_unlock(&v->lock);
}
return 1;
}
/** find a view by name */
struct view*
views_find_view(struct views* vs, const char* name, int write)
{
struct view* v;
struct view key;
key.node.key = &v;
key.name = (char *)name;
lock_rw_rdlock(&vs->lock);
if(!(v = (struct view*)rbtree_search(&vs->vtree, &key.node))) {
lock_rw_unlock(&vs->lock);
return 0;
}
if(write) {
lock_rw_wrlock(&v->lock);
} else {
lock_rw_rdlock(&v->lock);
}
lock_rw_unlock(&vs->lock);
return v;
}
void views_print(struct views* v)
{
/* TODO implement print */
(void)v;
}
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