monero/external/unbound/services/view.c
Erik de Castro Lopo a85b5759f3 Upgrade unbound library
These files were pulled from the 1.6.3 release tarball.

This new version builds against OpenSSL version 1.1 which will be
the default in the new Debian Stable which is due to be released
RealSoonNow (tm).
2017-06-17 23:04:00 +10:00

213 lines
5.4 KiB
C

/*
* 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(!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;
}