text: /*
   * Portions Copyright (C) 2004-2012  Internet Systems Consortium, Inc. ("ISC")
   * Portions Copyright (C) 1999-2003  Internet Software Consortium.
   *
   * Permission to use, copy, modify, and/or 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 ISC AND NETWORK ASSOCIATES DISCLAIMS
   * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE
   * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF 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.
   *
   * Portions Copyright (C) 1995-2000 by Network Associates, Inc.
   *
   * Permission to use, copy, modify, and/or 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 ISC AND NETWORK ASSOCIATES DISCLAIMS
   * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE
   * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF 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.
   */
  
  /*
   * Principal Author: Brian Wellington
   * $Id$
   */
  #ifdef OPENSSL
  
  #include <config.h>
  
  #include <isc/entropy.h>
  #include <isc/mem.h>
  #include <isc/mutex.h>
  #include <isc/mutexblock.h>
  #include <isc/string.h>
  #include <isc/thread.h>
  #include <isc/util.h>
  
  #include <dns/log.h>
  
  #include <dst/result.h>
  
  #include "dst_internal.h"
  #include "dst_openssl.h"
  
  #ifdef USE_ENGINE
  #include <openssl/engine.h>
  #endif
  
  static RAND_METHOD *rm = NULL;
  
  static isc_mutex_t *locks = NULL;
  static int nlocks;
  
  #ifdef USE_ENGINE
  static ENGINE *e = NULL;
  #endif
  
  static int
  entropy_get(unsigned char *buf, int num) {
  	isc_result_t result;
  	if (num < 0)
  		return (-1);
  	result = dst__entropy_getdata(buf, (unsigned int) num, ISC_FALSE);
  	return (result == ISC_R_SUCCESS ? 1 : -1);
  }
  
  static int
  entropy_status(void) {
  	return (dst__entropy_status() > 32);
  }
  
  static int
  entropy_getpseudo(unsigned char *buf, int num) {
  	isc_result_t result;
  	if (num < 0)
  		return (-1);
  	result = dst__entropy_getdata(buf, (unsigned int) num, ISC_TRUE);
  	return (result == ISC_R_SUCCESS ? 1 : -1);
  }
  
  static void
  entropy_add(const void *buf, int num, double entropy) {
  	/*
  	 * Do nothing.  The only call to this provides no useful data anyway.
  	 */
  	UNUSED(buf);
  	UNUSED(num);
  	UNUSED(entropy);
  }
  
  static void
  lock_callback(int mode, int type, const char *file, int line) {
  	UNUSED(file);
  	UNUSED(line);
  	if ((mode & CRYPTO_LOCK) != 0)
  		LOCK(&locks[type]);
  	else
  		UNLOCK(&locks[type]);
  }
  
  static unsigned long
  id_callback(void) {
  	return ((unsigned long)isc_thread_self());
  }
  
  static void *
  mem_alloc(size_t size) {
  #ifdef OPENSSL_LEAKS
  	void *ptr;
  
  	INSIST(dst__memory_pool != NULL);
  	ptr = isc_mem_allocate(dst__memory_pool, size);
  	return (ptr);
  #else
  	INSIST(dst__memory_pool != NULL);
  	return (isc_mem_allocate(dst__memory_pool, size));
  #endif
  }
  
  static void
  mem_free(void *ptr) {
  	INSIST(dst__memory_pool != NULL);
  	if (ptr != NULL)
  		isc_mem_free(dst__memory_pool, ptr);
  }
  
  static void *
  mem_realloc(void *ptr, size_t size) {
  #ifdef OPENSSL_LEAKS
  	void *rptr;
  
  	INSIST(dst__memory_pool != NULL);
  	rptr = isc_mem_reallocate(dst__memory_pool, ptr, size);
  	return (rptr);
  #else
  	INSIST(dst__memory_pool != NULL);
  	return (isc_mem_reallocate(dst__memory_pool, ptr, size));
  #endif
  }
  
  isc_result_t
  dst__openssl_init(const char *engine) {
  	isc_result_t result;
  #ifdef USE_ENGINE
  	ENGINE *re;
  #else
  
  	UNUSED(engine);
  #endif
  
  #ifdef  DNS_CRYPTO_LEAKS
  	CRYPTO_malloc_debug_init();
  	CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
  	CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
  #endif
  	CRYPTO_set_mem_functions(mem_alloc, mem_realloc, mem_free);
  	nlocks = CRYPTO_num_locks();
  	locks = mem_alloc(sizeof(isc_mutex_t) * nlocks);
  	if (locks == NULL)
  		return (ISC_R_NOMEMORY);
  	result = isc_mutexblock_init(locks, nlocks);
  	if (result != ISC_R_SUCCESS)
  		goto cleanup_mutexalloc;
  	CRYPTO_set_locking_callback(lock_callback);
  	CRYPTO_set_id_callback(id_callback);
  
  	ERR_load_crypto_strings();
  
  	rm = mem_alloc(sizeof(RAND_METHOD));
  	if (rm == NULL) {
  		result = ISC_R_NOMEMORY;
  		goto cleanup_mutexinit;
  	}
  	rm->seed = NULL;
  	rm->bytes = entropy_get;
  	rm->cleanup = NULL;
  	rm->add = entropy_add;
  	rm->pseudorand = entropy_getpseudo;
  	rm->status = entropy_status;
  
  #ifdef USE_ENGINE
  	OPENSSL_config(NULL);
  
  	if (engine != NULL && *engine == '\0')
  		engine = NULL;
  
  	if (engine != NULL) {
  		e = ENGINE_by_id(engine);
  		if (e == NULL) {
  			result = DST_R_NOENGINE;
  			goto cleanup_rm;
  		}
  		/* This will init the engine. */
  		if (!ENGINE_set_default(e, ENGINE_METHOD_ALL)) {
  			result = DST_R_NOENGINE;
  			goto cleanup_rm;
  		}
  	}
  
  	re = ENGINE_get_default_RAND();
  	if (re == NULL) {
  		re = ENGINE_new();
  		if (re == NULL) {
  			result = ISC_R_NOMEMORY;
  			goto cleanup_rm;
  		}
  		ENGINE_set_RAND(re, rm);
  		ENGINE_set_default_RAND(re);
  		ENGINE_free(re);
  	} else
  		ENGINE_finish(re);
  #else
  	RAND_set_rand_method(rm);
  #endif /* USE_ENGINE */
  	return (ISC_R_SUCCESS);
  
  #ifdef USE_ENGINE
   cleanup_rm:
  	if (e != NULL)
  		ENGINE_free(e);
  	e = NULL;
  	mem_free(rm);
  	rm = NULL;
  #endif
   cleanup_mutexinit:
  	CRYPTO_set_locking_callback(NULL);
  	DESTROYMUTEXBLOCK(locks, nlocks);
   cleanup_mutexalloc:
  	mem_free(locks);
  	locks = NULL;
  	return (result);
  }
  
  void
  dst__openssl_destroy() {
  
  	/*
  	 * Sequence taken from apps_shutdown() in <apps/apps.h>.
  	 */
  	if (rm != NULL) {
  #if OPENSSL_VERSION_NUMBER >= 0x00907000L
  		RAND_cleanup();
  #endif
  		mem_free(rm);
  		rm = NULL;
  	}
  #if (OPENSSL_VERSION_NUMBER >= 0x00907000L)
  	CONF_modules_free();
  #endif
  	OBJ_cleanup();
  	EVP_cleanup();
  #if defined(USE_ENGINE)
  	if (e != NULL)
  		ENGINE_free(e);
  	e = NULL;
  #if defined(USE_ENGINE) && OPENSSL_VERSION_NUMBER >= 0x00907000L
  	ENGINE_cleanup();
  #endif
  #endif
  #if (OPENSSL_VERSION_NUMBER >= 0x00907000L)
  	CRYPTO_cleanup_all_ex_data();
  #endif
  	ERR_clear_error();
  	ERR_remove_state(0);
  	ERR_free_strings();
  
  #ifdef  DNS_CRYPTO_LEAKS
  	CRYPTO_mem_leaks_fp(stderr);
  #endif
  
  	if (locks != NULL) {
  		CRYPTO_set_locking_callback(NULL);
  		DESTROYMUTEXBLOCK(locks, nlocks);
  		mem_free(locks);
  		locks = NULL;
  	}
  }
  
  isc_result_t
  dst__openssl_toresult(isc_result_t fallback) {
  	isc_result_t result = fallback;
  	unsigned long err = ERR_get_error();
  
  	switch (ERR_GET_REASON(err)) {
  	case ERR_R_MALLOC_FAILURE:
  		result = ISC_R_NOMEMORY;
  		break;
  	default:
  		break;
  	}
  	ERR_clear_error();
  	return (result);
  }
  
  isc_result_t
  dst__openssl_toresult2(const char *funcname, isc_result_t fallback) {
  	isc_result_t result = fallback;
  	unsigned long err = ERR_peek_error();
  	const char *file, *data;
  	int line, flags;
  	char buf[256];
  
  	switch (ERR_GET_REASON(err)) {
  	case ERR_R_MALLOC_FAILURE:
  		result = ISC_R_NOMEMORY;
  		goto done;
  	default:
  		break;
  	}
  	isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL,
  		      DNS_LOGMODULE_CRYPTO, ISC_LOG_WARNING,
  		      "%s failed", funcname);
  	for (;;) {
  		err = ERR_get_error_line_data(&file, &line, &data, &flags);
  		if (err == 0U)
  			goto done;
  		ERR_error_string_n(err, buf, sizeof(buf));
  		isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL,
  			      DNS_LOGMODULE_CRYPTO, ISC_LOG_INFO,
  			      "%s:%s:%d:%s", buf, file, line,
  			      (flags & ERR_TXT_STRING) ? data : "");
  	}
  
      done:
  	ERR_clear_error();
  	return (result);
  }
  
  #if defined(USE_ENGINE)
  ENGINE *
  dst__openssl_getengine(const char *engine) {
  
  	if (engine == NULL)
  		return (NULL);
  	if (e == NULL)
  		return (NULL);
  	if (strcmp(engine, ENGINE_get_id(e)) == 0)
  		return (e);
  	return (NULL);
  }
  #endif
  
  #else /* OPENSSL */
  
  #include <isc/util.h>
  
  EMPTY_TRANSLATION_UNIT
  
  #endif /* OPENSSL */
  /*! \file */
  