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/*
* libunbound/context.c - validating context for unbound internal use
*
* Copyright (c) 2007, 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 REGENTS 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 the validator context structure.
*/
#include "config.h"
#include "libunbound/context.h"
#include "util/module.h"
#include "util/config_file.h"
#include "util/net_help.h"
#include "services/modstack.h"
#include "services/localzone.h"
#include "services/cache/rrset.h"
#include "services/cache/infra.h"
#include "util/data/msgreply.h"
#include "util/storage/slabhash.h"
int
context_finalize(struct ub_ctx* ctx)
{
struct config_file* cfg = ctx->env->cfg;
verbosity = cfg->verbosity;
if(ctx->logfile_override)
log_file(ctx->log_out);
else log_init(cfg->logfile, cfg->use_syslog, NULL);
config_apply(cfg);
if(!modstack_setup(&ctx->mods, cfg->module_conf, ctx->env))
return UB_INITFAIL;
ctx->local_zones = local_zones_create();
if(!ctx->local_zones)
return UB_NOMEM;
if(!local_zones_apply_cfg(ctx->local_zones, cfg))
return UB_INITFAIL;
if(!ctx->env->msg_cache ||
cfg->msg_cache_size != slabhash_get_size(ctx->env->msg_cache) ||
cfg->msg_cache_slabs != ctx->env->msg_cache->size) {
slabhash_delete(ctx->env->msg_cache);
ctx->env->msg_cache = slabhash_create(cfg->msg_cache_slabs,
HASH_DEFAULT_STARTARRAY, cfg->msg_cache_size,
msgreply_sizefunc, query_info_compare,
query_entry_delete, reply_info_delete, NULL);
if(!ctx->env->msg_cache)
return UB_NOMEM;
}
ctx->env->rrset_cache = rrset_cache_adjust(ctx->env->rrset_cache,
ctx->env->cfg, ctx->env->alloc);
if(!ctx->env->rrset_cache)
return UB_NOMEM;
ctx->env->infra_cache = infra_adjust(ctx->env->infra_cache, cfg);
if(!ctx->env->infra_cache)
return UB_NOMEM;
ctx->finalized = 1;
return UB_NOERROR;
}
int context_query_cmp(const void* a, const void* b)
{
if( *(int*)a < *(int*)b )
return -1;
if( *(int*)a > *(int*)b )
return 1;
return 0;
}
void
context_query_delete(struct ctx_query* q)
{
if(!q) return;
ub_resolve_free(q->res);
free(q->msg);
free(q);
}
/** How many times to try to find an unused query-id-number for async */
#define NUM_ID_TRIES 100000
/** find next useful id number of 0 on error */
static int
find_id(struct ub_ctx* ctx, int* id)
{
size_t tries = 0;
ctx->next_querynum++;
while(rbtree_search(&ctx->queries, &ctx->next_querynum)) {
ctx->next_querynum++; /* numerical wraparound is fine */
if(tries++ > NUM_ID_TRIES)
return 0;
}
*id = ctx->next_querynum;
return 1;
}
struct ctx_query*
context_new(struct ub_ctx* ctx, char* name, int rrtype, int rrclass,
ub_callback_t cb, void* cbarg)
{
struct ctx_query* q = (struct ctx_query*)calloc(1, sizeof(*q));
if(!q) return NULL;
lock_basic_lock(&ctx->cfglock);
if(!find_id(ctx, &q->querynum)) {
lock_basic_unlock(&ctx->cfglock);
free(q);
return NULL;
}
lock_basic_unlock(&ctx->cfglock);
q->node.key = &q->querynum;
q->async = (cb != NULL);
q->cb = cb;
q->cb_arg = cbarg;
q->res = (struct ub_result*)calloc(1, sizeof(*q->res));
if(!q->res) {
free(q);
return NULL;
}
q->res->qname = strdup(name);
if(!q->res->qname) {
free(q->res);
free(q);
return NULL;
}
q->res->qtype = rrtype;
q->res->qclass = rrclass;
/* add to query list */
lock_basic_lock(&ctx->cfglock);
if(q->async)
ctx->num_async ++;
(void)rbtree_insert(&ctx->queries, &q->node);
lock_basic_unlock(&ctx->cfglock);
return q;
}
struct alloc_cache*
context_obtain_alloc(struct ub_ctx* ctx, int locking)
{
struct alloc_cache* a;
int tnum = 0;
if(locking) {
lock_basic_lock(&ctx->cfglock);
}
a = ctx->alloc_list;
if(a)
ctx->alloc_list = a->super; /* snip off list */
else tnum = ctx->thr_next_num++;
if(locking) {
lock_basic_unlock(&ctx->cfglock);
}
if(a) {
a->super = &ctx->superalloc;
return a;
}
a = (struct alloc_cache*)calloc(1, sizeof(*a));
if(!a)
return NULL;
alloc_init(a, &ctx->superalloc, tnum);
return a;
}
void
context_release_alloc(struct ub_ctx* ctx, struct alloc_cache* alloc,
int locking)
{
if(!ctx || !alloc)
return;
if(locking) {
lock_basic_lock(&ctx->cfglock);
}
alloc->super = ctx->alloc_list;
ctx->alloc_list = alloc;
if(locking) {
lock_basic_unlock(&ctx->cfglock);
}
}
uint8_t*
context_serialize_new_query(struct ctx_query* q, uint32_t* len)
{
/* format for new query is
* o uint32 cmd
* o uint32 id
* o uint32 type
* o uint32 class
* o rest queryname (string)
*/
uint8_t* p;
size_t slen = strlen(q->res->qname) + 1/*end of string*/;
*len = sizeof(uint32_t)*4 + slen;
p = (uint8_t*)malloc(*len);
if(!p) return NULL;
ldns_write_uint32(p, UB_LIBCMD_NEWQUERY);
ldns_write_uint32(p+sizeof(uint32_t), (uint32_t)q->querynum);
ldns_write_uint32(p+2*sizeof(uint32_t), (uint32_t)q->res->qtype);
ldns_write_uint32(p+3*sizeof(uint32_t), (uint32_t)q->res->qclass);
memmove(p+4*sizeof(uint32_t), q->res->qname, slen);
return p;
}
struct ctx_query*
context_deserialize_new_query(struct ub_ctx* ctx, uint8_t* p, uint32_t len)
{
struct ctx_query* q = (struct ctx_query*)calloc(1, sizeof(*q));
if(!q) return NULL;
if(len < 4*sizeof(uint32_t)+1) {
free(q);
return NULL;
}
log_assert( ldns_read_uint32(p) == UB_LIBCMD_NEWQUERY);
q->querynum = (int)ldns_read_uint32(p+sizeof(uint32_t));
q->node.key = &q->querynum;
q->async = 1;
q->res = (struct ub_result*)calloc(1, sizeof(*q->res));
if(!q->res) {
free(q);
return NULL;
}
q->res->qtype = (int)ldns_read_uint32(p+2*sizeof(uint32_t));
q->res->qclass = (int)ldns_read_uint32(p+3*sizeof(uint32_t));
q->res->qname = strdup((char*)(p+4*sizeof(uint32_t)));
if(!q->res->qname) {
free(q->res);
free(q);
return NULL;
}
/** add to query list */
ctx->num_async++;
(void)rbtree_insert(&ctx->queries, &q->node);
return q;
}
struct ctx_query*
context_lookup_new_query(struct ub_ctx* ctx, uint8_t* p, uint32_t len)
{
struct ctx_query* q;
int querynum;
if(len < 4*sizeof(uint32_t)+1) {
return NULL;
}
log_assert( ldns_read_uint32(p) == UB_LIBCMD_NEWQUERY);
querynum = (int)ldns_read_uint32(p+sizeof(uint32_t));
q = (struct ctx_query*)rbtree_search(&ctx->queries, &querynum);
if(!q) {
return NULL;
}
log_assert(q->async);
return q;
}
uint8_t*
context_serialize_answer(struct ctx_query* q, int err, ldns_buffer* pkt,
uint32_t* len)
{
/* answer format
* o uint32 cmd
* o uint32 id
* o uint32 error_code
* o uint32 msg_security
* o uint32 length of why_bogus string (+1 for eos); 0 absent.
* o why_bogus_string
* o the remainder is the answer msg from resolver lookup.
* remainder can be length 0.
*/
size_t pkt_len = pkt?ldns_buffer_remaining(pkt):0;
size_t wlen = (pkt&&q->res->why_bogus)?strlen(q->res->why_bogus)+1:0;
uint8_t* p;
*len = sizeof(uint32_t)*5 + pkt_len + wlen;
p = (uint8_t*)malloc(*len);
if(!p) return NULL;
ldns_write_uint32(p, UB_LIBCMD_ANSWER);
ldns_write_uint32(p+sizeof(uint32_t), (uint32_t)q->querynum);
ldns_write_uint32(p+2*sizeof(uint32_t), (uint32_t)err);
ldns_write_uint32(p+3*sizeof(uint32_t), (uint32_t)q->msg_security);
ldns_write_uint32(p+4*sizeof(uint32_t), (uint32_t)wlen);
if(wlen > 0)
memmove(p+5*sizeof(uint32_t), q->res->why_bogus, wlen);
if(pkt_len > 0)
memmove(p+5*sizeof(uint32_t)+wlen,
ldns_buffer_begin(pkt), pkt_len);
return p;
}
struct ctx_query*
context_deserialize_answer(struct ub_ctx* ctx,
uint8_t* p, uint32_t len, int* err)
{
struct ctx_query* q = NULL ;
int id;
size_t wlen;
if(len < 5*sizeof(uint32_t)) return NULL;
log_assert( ldns_read_uint32(p) == UB_LIBCMD_ANSWER);
id = (int)ldns_read_uint32(p+sizeof(uint32_t));
q = (struct ctx_query*)rbtree_search(&ctx->queries, &id);
if(!q) return NULL;
*err = (int)ldns_read_uint32(p+2*sizeof(uint32_t));
q->msg_security = ldns_read_uint32(p+3*sizeof(uint32_t));
wlen = (size_t)ldns_read_uint32(p+4*sizeof(uint32_t));
if(len > 5*sizeof(uint32_t) && wlen > 0) {
if(len >= 5*sizeof(uint32_t)+wlen)
q->res->why_bogus = (char*)memdup(
p+5*sizeof(uint32_t), wlen);
if(!q->res->why_bogus) {
/* pass malloc failure to the user callback */
q->msg_len = 0;
*err = UB_NOMEM;
return q;
}
q->res->why_bogus[wlen-1] = 0; /* zero terminated for sure */
}
if(len > 5*sizeof(uint32_t)+wlen) {
q->msg_len = len - 5*sizeof(uint32_t) - wlen;
q->msg = (uint8_t*)memdup(p+5*sizeof(uint32_t)+wlen,
q->msg_len);
if(!q->msg) {
/* pass malloc failure to the user callback */
q->msg_len = 0;
*err = UB_NOMEM;
return q;
}
}
return q;
}
uint8_t*
context_serialize_cancel(struct ctx_query* q, uint32_t* len)
{
/* format of cancel:
* o uint32 cmd
* o uint32 async-id */
uint8_t* p = (uint8_t*)malloc(2*sizeof(uint32_t));
if(!p) return NULL;
*len = 2*sizeof(uint32_t);
ldns_write_uint32(p, UB_LIBCMD_CANCEL);
ldns_write_uint32(p+sizeof(uint32_t), (uint32_t)q->querynum);
return p;
}
struct ctx_query* context_deserialize_cancel(struct ub_ctx* ctx,
uint8_t* p, uint32_t len)
{
struct ctx_query* q;
int id;
if(len != 2*sizeof(uint32_t)) return NULL;
log_assert( ldns_read_uint32(p) == UB_LIBCMD_CANCEL);
id = (int)ldns_read_uint32(p+sizeof(uint32_t));
q = (struct ctx_query*)rbtree_search(&ctx->queries, &id);
return q;
}
uint8_t*
context_serialize_quit(uint32_t* len)
{
uint8_t* p = (uint8_t*)malloc(sizeof(uint32_t));
if(!p)
return NULL;
*len = sizeof(uint32_t);
ldns_write_uint32(p, UB_LIBCMD_QUIT);
return p;
}
enum ub_ctx_cmd context_serial_getcmd(uint8_t* p, uint32_t len)
{
uint32_t v;
if((size_t)len < sizeof(v))
return UB_LIBCMD_QUIT;
v = ldns_read_uint32(p);
return v;
}
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