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boringssl/ssl/ssl_stat.c
David Benjamin b8d28cf532 Factor out the buffering and low-level record code. 
This begins decoupling the transport from the SSL state machine. The buffering
logic is hidden behind an opaque API. Fields like ssl->packet and
ssl->packet_length are gone.

ssl3_get_record and dtls1_get_record now call low-level tls_open_record and
dtls_open_record functions that unpack a single record independent of who owns
the buffer. Both may be called in-place. This removes ssl->rstate which was
redundant with the buffer length.

Future work will push the buffer up the stack until it is above the handshake.
Then we can expose SSL_open and SSL_seal APIs which act like *_open_record but
return a slightly larger enum due to other events being possible. Likewise the
handshake state machine will be detached from its buffer. The existing
SSL_read, SSL_write, etc., APIs will be implemented on top of SSL_open, etc.,
combined with ssl_read_buffer_* and ssl_write_buffer_*. (Which is why
ssl_read_buffer_extend still tries to abstract between TLS's and DTLS's fairly
different needs.)

The new buffering logic does not support read-ahead (removed previously) since
it lacks a memmove on ssl_read_buffer_discard for TLS, but this could be added
if desired. The old buffering logic wasn't quite right anyway; it tried to
avoid the memmove in some cases and could get stuck too far into the buffer and
not accept records. (The only time the memmove is optional is in DTLS or if
enough of the record header is available to know that the entire next record
would fit in the buffer.)

The new logic also now actually decrypts the ciphertext in-place again, rather
than almost in-place when there's an explicit nonce/IV. (That accidentally
switched in https://boringssl-review.googlesource.com/#/c/4792/; see
3d59e04bce96474099ba76786a2337e99ae14505.)

BUG=468889

Change-Id: I403c1626253c46897f47c7ae93aeab1064b767b2
Reviewed-on: https://boringssl-review.googlesource.com/5715
Reviewed-by: Adam Langley <agl@google.com>
2015-08-28 22:01:02 +00:00

885 lines
20 KiB
C
Raw Blame History

/* ssl/ssl_stat.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* ====================================================================
* Copyright 2005 Nokia. All rights reserved.
*
* The portions of the attached software ("Contribution") is developed by
* Nokia Corporation and is licensed pursuant to the OpenSSL open source
* license.
*
* The Contribution, originally written by Mika Kousa and Pasi Eronen of
* Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
* support (see RFC 4279) to OpenSSL.
*
* No patent licenses or other rights except those expressly stated in
* the OpenSSL open source license shall be deemed granted or received
* expressly, by implication, estoppel, or otherwise.
*
* No assurances are provided by Nokia that the Contribution does not
* infringe the patent or other intellectual property rights of any third
* party or that the license provides you with all the necessary rights
* to make use of the Contribution.
*
* THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
* ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
* SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
* OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
* OTHERWISE.
*/
#include <stdio.h>
#include "internal.h"
const char *SSL_state_string_long(const SSL *s) {
const char *str;
switch (s->state) {
case SSL_ST_ACCEPT:
str = "before accept initialization";
break;
case SSL_ST_CONNECT:
str = "before connect initialization";
break;
case SSL_ST_OK:
str = "SSL negotiation finished successfully";
break;
case SSL_ST_RENEGOTIATE:
str = "SSL renegotiate ciphers";
break;
/* SSLv3 additions */
case SSL3_ST_CW_CLNT_HELLO_A:
str = "SSLv3 write client hello A";
break;
case SSL3_ST_CW_CLNT_HELLO_B:
str = "SSLv3 write client hello B";
break;
case SSL3_ST_CR_SRVR_HELLO_A:
str = "SSLv3 read server hello A";
break;
case SSL3_ST_CR_SRVR_HELLO_B:
str = "SSLv3 read server hello B";
break;
case SSL3_ST_CR_CERT_A:
str = "SSLv3 read server certificate A";
break;
case SSL3_ST_CR_CERT_B:
str = "SSLv3 read server certificate B";
break;
case SSL3_ST_CR_KEY_EXCH_A:
str = "SSLv3 read server key exchange A";
break;
case SSL3_ST_CR_KEY_EXCH_B:
str = "SSLv3 read server key exchange B";
break;
case SSL3_ST_CR_CERT_REQ_A:
str = "SSLv3 read server certificate request A";
break;
case SSL3_ST_CR_CERT_REQ_B:
str = "SSLv3 read server certificate request B";
break;
case SSL3_ST_CR_SESSION_TICKET_A:
str = "SSLv3 read server session ticket A";
break;
case SSL3_ST_CR_SESSION_TICKET_B:
str = "SSLv3 read server session ticket B";
break;
case SSL3_ST_CR_SRVR_DONE_A:
str = "SSLv3 read server done A";
break;
case SSL3_ST_CR_SRVR_DONE_B:
str = "SSLv3 read server done B";
break;
case SSL3_ST_CW_CERT_A:
str = "SSLv3 write client certificate A";
break;
case SSL3_ST_CW_CERT_B:
str = "SSLv3 write client certificate B";
break;
case SSL3_ST_CW_CERT_C:
str = "SSLv3 write client certificate C";
break;
case SSL3_ST_CW_CERT_D:
str = "SSLv3 write client certificate D";
break;
case SSL3_ST_CW_KEY_EXCH_A:
str = "SSLv3 write client key exchange A";
break;
case SSL3_ST_CW_KEY_EXCH_B:
str = "SSLv3 write client key exchange B";
break;
case SSL3_ST_CW_CERT_VRFY_A:
str = "SSLv3 write certificate verify A";
break;
case SSL3_ST_CW_CERT_VRFY_B:
str = "SSLv3 write certificate verify B";
break;
case SSL3_ST_CW_CHANGE_A:
case SSL3_ST_SW_CHANGE_A:
str = "SSLv3 write change cipher spec A";
break;
case SSL3_ST_CW_CHANGE_B:
case SSL3_ST_SW_CHANGE_B:
str = "SSLv3 write change cipher spec B";
break;
case SSL3_ST_CW_FINISHED_A:
case SSL3_ST_SW_FINISHED_A:
str = "SSLv3 write finished A";
break;
case SSL3_ST_CW_FINISHED_B:
case SSL3_ST_SW_FINISHED_B:
str = "SSLv3 write finished B";
break;
case SSL3_ST_CR_CHANGE:
case SSL3_ST_SR_CHANGE:
str = "SSLv3 read change cipher spec";
break;
case SSL3_ST_CR_FINISHED_A:
case SSL3_ST_SR_FINISHED_A:
str = "SSLv3 read finished A";
break;
case SSL3_ST_CR_FINISHED_B:
case SSL3_ST_SR_FINISHED_B:
str = "SSLv3 read finished B";
break;
case SSL3_ST_CW_FLUSH:
case SSL3_ST_SW_FLUSH:
str = "SSLv3 flush data";
break;
case SSL3_ST_SR_CLNT_HELLO_A:
str = "SSLv3 read client hello A";
break;
case SSL3_ST_SR_CLNT_HELLO_B:
str = "SSLv3 read client hello B";
break;
case SSL3_ST_SR_CLNT_HELLO_C:
str = "SSLv3 read client hello C";
break;
case SSL3_ST_SR_CLNT_HELLO_D:
str = "SSLv3 read client hello D";
break;
case SSL3_ST_SW_HELLO_REQ_A:
str = "SSLv3 write hello request A";
break;
case SSL3_ST_SW_HELLO_REQ_B:
str = "SSLv3 write hello request B";
break;
case SSL3_ST_SW_HELLO_REQ_C:
str = "SSLv3 write hello request C";
break;
case SSL3_ST_SW_SRVR_HELLO_A:
str = "SSLv3 write server hello A";
break;
case SSL3_ST_SW_SRVR_HELLO_B:
str = "SSLv3 write server hello B";
break;
case SSL3_ST_SW_CERT_A:
str = "SSLv3 write certificate A";
break;
case SSL3_ST_SW_CERT_B:
str = "SSLv3 write certificate B";
break;
case SSL3_ST_SW_KEY_EXCH_A:
str = "SSLv3 write key exchange A";
break;
case SSL3_ST_SW_KEY_EXCH_B:
str = "SSLv3 write key exchange B";
break;
case SSL3_ST_SW_CERT_REQ_A:
str = "SSLv3 write certificate request A";
break;
case SSL3_ST_SW_CERT_REQ_B:
str = "SSLv3 write certificate request B";
break;
case SSL3_ST_SW_SESSION_TICKET_A:
str = "SSLv3 write session ticket A";
break;
case SSL3_ST_SW_SESSION_TICKET_B:
str = "SSLv3 write session ticket B";
break;
case SSL3_ST_SW_SRVR_DONE_A:
str = "SSLv3 write server done A";
break;
case SSL3_ST_SW_SRVR_DONE_B:
str = "SSLv3 write server done B";
break;
case SSL3_ST_SR_CERT_A:
str = "SSLv3 read client certificate A";
break;
case SSL3_ST_SR_CERT_B:
str = "SSLv3 read client certificate B";
break;
case SSL3_ST_SR_KEY_EXCH_A:
str = "SSLv3 read client key exchange A";
break;
case SSL3_ST_SR_KEY_EXCH_B:
str = "SSLv3 read client key exchange B";
break;
case SSL3_ST_SR_CERT_VRFY_A:
str = "SSLv3 read certificate verify A";
break;
case SSL3_ST_SR_CERT_VRFY_B:
str = "SSLv3 read certificate verify B";
break;
/* DTLS */
case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
str = "DTLS1 read hello verify request A";
break;
case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
str = "DTLS1 read hello verify request B";
break;
default:
str = "unknown state";
break;
}
return str;
}
const char *SSL_state_string(const SSL *s) {
const char *str;
switch (s->state) {
case SSL_ST_ACCEPT:
str = "AINIT ";
break;
case SSL_ST_CONNECT:
str = "CINIT ";
break;
case SSL_ST_OK:
str = "SSLOK ";
break;
/* SSLv3 additions */
case SSL3_ST_SW_FLUSH:
case SSL3_ST_CW_FLUSH:
str = "3FLUSH";
break;
case SSL3_ST_CW_CLNT_HELLO_A:
str = "3WCH_A";
break;
case SSL3_ST_CW_CLNT_HELLO_B:
str = "3WCH_B";
break;
case SSL3_ST_CR_SRVR_HELLO_A:
str = "3RSH_A";
break;
case SSL3_ST_CR_SRVR_HELLO_B:
str = "3RSH_B";
break;
case SSL3_ST_CR_CERT_A:
str = "3RSC_A";
break;
case SSL3_ST_CR_CERT_B:
str = "3RSC_B";
break;
case SSL3_ST_CR_KEY_EXCH_A:
str = "3RSKEA";
break;
case SSL3_ST_CR_KEY_EXCH_B:
str = "3RSKEB";
break;
case SSL3_ST_CR_CERT_REQ_A:
str = "3RCR_A";
break;
case SSL3_ST_CR_CERT_REQ_B:
str = "3RCR_B";
break;
case SSL3_ST_CR_SRVR_DONE_A:
str = "3RSD_A";
break;
case SSL3_ST_CR_SRVR_DONE_B:
str = "3RSD_B";
break;
case SSL3_ST_CW_CERT_A:
str = "3WCC_A";
break;
case SSL3_ST_CW_CERT_B:
str = "3WCC_B";
break;
case SSL3_ST_CW_CERT_C:
str = "3WCC_C";
break;
case SSL3_ST_CW_CERT_D:
str = "3WCC_D";
break;
case SSL3_ST_CW_KEY_EXCH_A:
str = "3WCKEA";
break;
case SSL3_ST_CW_KEY_EXCH_B:
str = "3WCKEB";
break;
case SSL3_ST_CW_CERT_VRFY_A:
str = "3WCV_A";
break;
case SSL3_ST_CW_CERT_VRFY_B:
str = "3WCV_B";
break;
case SSL3_ST_SW_CHANGE_A:
case SSL3_ST_CW_CHANGE_A:
str = "3WCCSA";
break;
case SSL3_ST_SW_CHANGE_B:
case SSL3_ST_CW_CHANGE_B:
str = "3WCCSB";
break;
case SSL3_ST_SW_FINISHED_A:
case SSL3_ST_CW_FINISHED_A:
str = "3WFINA";
break;
case SSL3_ST_SW_FINISHED_B:
case SSL3_ST_CW_FINISHED_B:
str = "3WFINB";
break;
case SSL3_ST_CR_CHANGE:
case SSL3_ST_SR_CHANGE:
str = "3RCCS_";
break;
case SSL3_ST_SR_FINISHED_A:
case SSL3_ST_CR_FINISHED_A:
str = "3RFINA";
break;
case SSL3_ST_SR_FINISHED_B:
case SSL3_ST_CR_FINISHED_B:
str = "3RFINB";
break;
case SSL3_ST_SW_HELLO_REQ_A:
str = "3WHR_A";
break;
case SSL3_ST_SW_HELLO_REQ_B:
str = "3WHR_B";
break;
case SSL3_ST_SW_HELLO_REQ_C:
str = "3WHR_C";
break;
case SSL3_ST_SR_CLNT_HELLO_A:
str = "3RCH_A";
break;
case SSL3_ST_SR_CLNT_HELLO_B:
str = "3RCH_B";
break;
case SSL3_ST_SR_CLNT_HELLO_C:
str = "3RCH_C";
break;
case SSL3_ST_SR_CLNT_HELLO_D:
str = "3RCH_D";
break;
case SSL3_ST_SW_SRVR_HELLO_A:
str = "3WSH_A";
break;
case SSL3_ST_SW_SRVR_HELLO_B:
str = "3WSH_B";
break;
case SSL3_ST_SW_CERT_A:
str = "3WSC_A";
break;
case SSL3_ST_SW_CERT_B:
str = "3WSC_B";
break;
case SSL3_ST_SW_KEY_EXCH_A:
str = "3WSKEA";
break;
case SSL3_ST_SW_KEY_EXCH_B:
str = "3WSKEB";
break;
case SSL3_ST_SW_CERT_REQ_A:
str = "3WCR_A";
break;
case SSL3_ST_SW_CERT_REQ_B:
str = "3WCR_B";
break;
case SSL3_ST_SW_SRVR_DONE_A:
str = "3WSD_A";
break;
case SSL3_ST_SW_SRVR_DONE_B:
str = "3WSD_B";
break;
case SSL3_ST_SR_CERT_A:
str = "3RCC_A";
break;
case SSL3_ST_SR_CERT_B:
str = "3RCC_B";
break;
case SSL3_ST_SR_KEY_EXCH_A:
str = "3RCKEA";
break;
case SSL3_ST_SR_KEY_EXCH_B:
str = "3RCKEB";
break;
case SSL3_ST_SR_CERT_VRFY_A:
str = "3RCV_A";
break;
case SSL3_ST_SR_CERT_VRFY_B:
str = "3RCV_B";
break;
/* DTLS */
case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
str = "DRCHVA";
break;
case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
str = "DRCHVB";
break;
default:
str = "UNKWN ";
break;
}
return str;
}
const char *SSL_alert_type_string_long(int value) {
value >>= 8;
if (value == SSL3_AL_WARNING) {
return "warning";
} else if (value == SSL3_AL_FATAL) {
return "fatal";
}
return "unknown";
}
const char *SSL_alert_type_string(int value) {
value >>= 8;
if (value == SSL3_AL_WARNING) {
return "W";
} else if (value == SSL3_AL_FATAL) {
return "F";
}
return "U";
}
const char *SSL_alert_desc_string(int value) {
const char *str;
switch (value & 0xff) {
case SSL3_AD_CLOSE_NOTIFY:
str = "CN";
break;
case SSL3_AD_UNEXPECTED_MESSAGE:
str = "UM";
break;
case SSL3_AD_BAD_RECORD_MAC:
str = "BM";
break;
case SSL3_AD_DECOMPRESSION_FAILURE:
str = "DF";
break;
case SSL3_AD_HANDSHAKE_FAILURE:
str = "HF";
break;
case SSL3_AD_NO_CERTIFICATE:
str = "NC";
break;
case SSL3_AD_BAD_CERTIFICATE:
str = "BC";
break;
case SSL3_AD_UNSUPPORTED_CERTIFICATE:
str = "UC";
break;
case SSL3_AD_CERTIFICATE_REVOKED:
str = "CR";
break;
case SSL3_AD_CERTIFICATE_EXPIRED:
str = "CE";
break;
case SSL3_AD_CERTIFICATE_UNKNOWN:
str = "CU";
break;
case SSL3_AD_ILLEGAL_PARAMETER:
str = "IP";
break;
case TLS1_AD_DECRYPTION_FAILED:
str = "DC";
break;
case TLS1_AD_RECORD_OVERFLOW:
str = "RO";
break;
case TLS1_AD_UNKNOWN_CA:
str = "CA";
break;
case TLS1_AD_ACCESS_DENIED:
str = "AD";
break;
case TLS1_AD_DECODE_ERROR:
str = "DE";
break;
case TLS1_AD_DECRYPT_ERROR:
str = "CY";
break;
case TLS1_AD_EXPORT_RESTRICTION:
str = "ER";
break;
case TLS1_AD_PROTOCOL_VERSION:
str = "PV";
break;
case TLS1_AD_INSUFFICIENT_SECURITY:
str = "IS";
break;
case TLS1_AD_INTERNAL_ERROR:
str = "IE";
break;
case TLS1_AD_USER_CANCELLED:
str = "US";
break;
case TLS1_AD_NO_RENEGOTIATION:
str = "NR";
break;
case TLS1_AD_UNSUPPORTED_EXTENSION:
str = "UE";
break;
case TLS1_AD_CERTIFICATE_UNOBTAINABLE:
str = "CO";
break;
case TLS1_AD_UNRECOGNIZED_NAME:
str = "UN";
break;
case TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
str = "BR";
break;
case TLS1_AD_BAD_CERTIFICATE_HASH_VALUE:
str = "BH";
break;
case TLS1_AD_UNKNOWN_PSK_IDENTITY:
str = "UP";
break;
default:
str = "UK";
break;
}
return str;
}
const char *SSL_alert_desc_string_long(int value) {
const char *str;
switch (value & 0xff) {
case SSL3_AD_CLOSE_NOTIFY:
str = "close notify";
break;
case SSL3_AD_UNEXPECTED_MESSAGE:
str = "unexpected_message";
break;
case SSL3_AD_BAD_RECORD_MAC:
str = "bad record mac";
break;
case SSL3_AD_DECOMPRESSION_FAILURE:
str = "decompression failure";
break;
case SSL3_AD_HANDSHAKE_FAILURE:
str = "handshake failure";
break;
case SSL3_AD_NO_CERTIFICATE:
str = "no certificate";
break;
case SSL3_AD_BAD_CERTIFICATE:
str = "bad certificate";
break;
case SSL3_AD_UNSUPPORTED_CERTIFICATE:
str = "unsupported certificate";
break;
case SSL3_AD_CERTIFICATE_REVOKED:
str = "certificate revoked";
break;
case SSL3_AD_CERTIFICATE_EXPIRED:
str = "certificate expired";
break;
case SSL3_AD_CERTIFICATE_UNKNOWN:
str = "certificate unknown";
break;
case SSL3_AD_ILLEGAL_PARAMETER:
str = "illegal parameter";
break;
case TLS1_AD_DECRYPTION_FAILED:
str = "decryption failed";
break;
case TLS1_AD_RECORD_OVERFLOW:
str = "record overflow";
break;
case TLS1_AD_UNKNOWN_CA:
str = "unknown CA";
break;
case TLS1_AD_ACCESS_DENIED:
str = "access denied";
break;
case TLS1_AD_DECODE_ERROR:
str = "decode error";
break;
case TLS1_AD_DECRYPT_ERROR:
str = "decrypt error";
break;
case TLS1_AD_EXPORT_RESTRICTION:
str = "export restriction";
break;
case TLS1_AD_PROTOCOL_VERSION:
str = "protocol version";
break;
case TLS1_AD_INSUFFICIENT_SECURITY:
str = "insufficient security";
break;
case TLS1_AD_INTERNAL_ERROR:
str = "internal error";
break;
case TLS1_AD_USER_CANCELLED:
str = "user canceled";
break;
case TLS1_AD_NO_RENEGOTIATION:
str = "no renegotiation";
break;
case TLS1_AD_UNSUPPORTED_EXTENSION:
str = "unsupported extension";
break;
case TLS1_AD_CERTIFICATE_UNOBTAINABLE:
str = "certificate unobtainable";
break;
case TLS1_AD_UNRECOGNIZED_NAME:
str = "unrecognized name";
break;
case TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
str = "bad certificate status response";
break;
case TLS1_AD_BAD_CERTIFICATE_HASH_VALUE:
str = "bad certificate hash value";
break;
case TLS1_AD_UNKNOWN_PSK_IDENTITY:
str = "unknown PSK identity";
break;
default:
str = "unknown";
break;
}
return str;
}
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