monero/external/unbound/libunbound/context.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

402 lines
11 KiB
C

/*
* 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 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 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"
#include "sldns/sbuffer.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;
log_edns_known_options(VERB_ALGO, ctx->env);
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, const char* name, int rrtype, int rrclass,
ub_callback_type 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;
sldns_write_uint32(p, UB_LIBCMD_NEWQUERY);
sldns_write_uint32(p+sizeof(uint32_t), (uint32_t)q->querynum);
sldns_write_uint32(p+2*sizeof(uint32_t), (uint32_t)q->res->qtype);
sldns_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( sldns_read_uint32(p) == UB_LIBCMD_NEWQUERY);
q->querynum = (int)sldns_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)sldns_read_uint32(p+2*sizeof(uint32_t));
q->res->qclass = (int)sldns_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( sldns_read_uint32(p) == UB_LIBCMD_NEWQUERY);
querynum = (int)sldns_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, sldns_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?sldns_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;
sldns_write_uint32(p, UB_LIBCMD_ANSWER);
sldns_write_uint32(p+sizeof(uint32_t), (uint32_t)q->querynum);
sldns_write_uint32(p+2*sizeof(uint32_t), (uint32_t)err);
sldns_write_uint32(p+3*sizeof(uint32_t), (uint32_t)q->msg_security);
sldns_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,
sldns_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( sldns_read_uint32(p) == UB_LIBCMD_ANSWER);
id = (int)sldns_read_uint32(p+sizeof(uint32_t));
q = (struct ctx_query*)rbtree_search(&ctx->queries, &id);
if(!q) return NULL;
*err = (int)sldns_read_uint32(p+2*sizeof(uint32_t));
q->msg_security = sldns_read_uint32(p+3*sizeof(uint32_t));
wlen = (size_t)sldns_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*)reallocarray(NULL, sizeof(uint32_t), 2);
if(!p) return NULL;
*len = 2*sizeof(uint32_t);
sldns_write_uint32(p, UB_LIBCMD_CANCEL);
sldns_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( sldns_read_uint32(p) == UB_LIBCMD_CANCEL);
id = (int)sldns_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);
sldns_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 = sldns_read_uint32(p);
return v;
}