utf8.c: Add UTF-8 validation and utility functions
There are various places in Asterisk - specifically in regards to
database integration - where having some kind of UTF-8 validation would
be beneficial. This patch adds:
* Functions to validate that a given string contains only valid UTF-8
sequences.
* A function to copy a string (similar to ast_copy_string) stopping when
an invalid UTF-8 sequence is encountered.
* A UTF-8 validator that allows for progressive validation.
All of this is based on the excellent UTF-8 decoder by Björn Höhrmann.
More information is available here:
https://bjoern.hoehrmann.de/utf-8/decoder/dfa/
The API was written in such a way that should allow us to replace the
implementation later should we determine that we need something more
comprehensive.
Change-Id: I3555d787a79e7c780a7800cd26e0b5056368abf9
This commit is contained in:
Sean Bright
Friendly Automation
parent
15a3318f1f
commit
e9e441c399
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@ -0,0 +1,188 @@
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/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2020, Sean Bright
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*
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* Sean Bright <sean.bright@gmail.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief UTF-8 information and validation functions
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*/
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#ifndef ASTERISK_UTF8_H
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#define ASTERISK_UTF8_H
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/*!
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* \brief Check if a zero-terminated string is valid UTF-8
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* \since 13.36.0, 16.13.0, 17.7.0, 18.0.0
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*
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* \param str The zero-terminated string to check
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*
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* \retval 0 if the string is not valid UTF-8
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* \retval Non-zero if the string is valid UTF-8
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*/
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int ast_utf8_is_valid(const char *str);
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/*!
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* \brief Check if the first \a size bytes of a string are valid UTF-8
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* \since 13.36.0, 16.13.0, 17.7.0, 18.0.0
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*
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* Similar to \a ast_utf8_is_valid() but checks the first \a size bytes or until
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* a zero byte is reached, whichever comes first.
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*
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* \param str The string to check
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* \param size The number of bytes to evaluate
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*
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* \retval 0 if the string is not valid UTF-8
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* \retval Non-zero if the string is valid UTF-8
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*/
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int ast_utf8_is_validn(const char *str, size_t size);
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/*!
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* \brief Copy a string safely ensuring valid UTF-8
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* \since 13.36.0, 16.13.0, 17.7.0, 18.0.0
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*
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* This is similar to \a ast_copy_string, but it will only copy valid UTF-8
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* sequences from the source string into the destination buffer. If an invalid
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* UTF-8 sequence is encountered, or the available space in the destination
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* buffer is exhausted in the middle of an otherwise valid UTF-8 sequence, the
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* destination buffer will be truncated to ensure that it only contains valid
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* UTF-8.
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*
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* \param dst The destination buffer.
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* \param src The source string
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* \param size The size of the destination buffer
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* \return Nothing.
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*/
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void ast_utf8_copy_string(char *dst, const char *src, size_t size);
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enum ast_utf8_validation_result {
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/*! \brief The consumed sequence is valid UTF-8
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*
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* The bytes consumed thus far by the validator represent a valid sequence of
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* UTF-8 bytes. If additional bytes are fed into the validator, it can
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* transition into either \a AST_UTF8_INVALID or \a AST_UTF8_UNKNOWN
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*/
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AST_UTF8_VALID,
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/*! \brief The consumed sequence is invalid UTF-8
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*
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* The bytes consumed thus far by the validator represent an invalid sequence
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* of UTF-8 bytes. Feeding additional bytes into the validator will not
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* change its state.
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*/
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AST_UTF8_INVALID,
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/*! \brief The validator is in an intermediate state
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*
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* The validator is in the process of validating a multibyte UTF-8 sequence
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* and requires additional data to be fed into it to determine validity. If
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* additional bytes are fed into the validator, it can transition into either
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* \a AST_UTF8_VALID or \a AST_UTF8_INVALID. If you have no additional data
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* to feed into the validator the UTF-8 sequence is invalid.
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*/
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AST_UTF8_UNKNOWN,
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};
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/*!
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* \brief Opaque type for UTF-8 validator state.
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* \since 13.36.0, 16.13.0, 17.7.0, 18.0.0
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*/
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struct ast_utf8_validator;
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/*!
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* \brief Create a new UTF-8 validator
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* \since 13.36.0, 16.13.0, 17.7.0, 18.0.0
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*
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* \param[out] validator The validator instance
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*
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* \retval 0 on success
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* \retval -1 on failure
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*/
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int ast_utf8_validator_new(struct ast_utf8_validator **validator);
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/*!
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* \brief Feed a zero-terminated string into the UTF-8 validator
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* \since 13.36.0, 16.13.0, 17.7.0, 18.0.0
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*
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* \param validator The validator instance
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* \param data The zero-terminated string to feed into the validator
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*
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* \return The \ref ast_utf8_validation_result indicating the current state of
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* the validator.
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*/
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enum ast_utf8_validation_result ast_utf8_validator_feed(
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struct ast_utf8_validator *validator, const char *data);
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/*!
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* \brief Feed a string into the UTF-8 validator
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* \since 13.36.0, 16.13.0, 17.7.0, 18.0.0
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*
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* Similar to \a ast_utf8_validator_feed but will stop feeding in data if a zero
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* byte is encountered or \a size bytes have been read.
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*
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* \param validator The validator instance
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* \param data The string to feed into the validator
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* \param size The number of bytes to feed into the validator
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*
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* \return The \ref ast_utf8_validation_result indicating the current state of
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* the validator.
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*/
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enum ast_utf8_validation_result ast_utf8_validator_feedn(
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struct ast_utf8_validator *validator, const char *data, size_t size);
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/*!
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* \brief Get the current UTF-8 validator state
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* \since 13.36.0, 16.13.0, 17.7.0, 18.0.0
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*
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* \param validator The validator instance
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*
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* \return The \ref ast_utf8_validation_result indicating the current state of
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* the validator.
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*/
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enum ast_utf8_validation_result ast_utf8_validator_state(
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struct ast_utf8_validator *validator);
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/*!
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* \brief Reset the state of a UTF-8 validator
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* \since 13.36.0, 16.13.0, 17.7.0, 18.0.0
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*
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* Resets the provided UTF-8 validator to its initial state so that it can be
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* reused.
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*
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* \param validator The validator instance to reset
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*/
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void ast_utf8_validator_reset(
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struct ast_utf8_validator *validator);
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/*!
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* \brief Destroy a UTF-8 validator
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* \since 13.36.0, 16.13.0, 17.7.0, 18.0.0
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*
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* \param validator The validator instance to destroy
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*/
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void ast_utf8_validator_destroy(struct ast_utf8_validator *validator);
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/*!
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* \brief Register UTF-8 tests
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* \since 13.36.0, 16.13.0, 17.7.0, 18.0.0
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*
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* Does nothing unless TEST_FRAMEWORK is defined.
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*
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* \return Always returns 0
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*/
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int ast_utf8_init(void);
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#endif /* ASTERISK_UTF8_H */
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@ -242,6 +242,7 @@ int daemon(int, int); /* defined in libresolv of all places */
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#include "asterisk/media_cache.h"
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#include "asterisk/astdb.h"
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#include "asterisk/options.h"
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#include "asterisk/utf8.h"
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#include "../defaults.h"
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@ -4065,6 +4066,7 @@ static void asterisk_daemon(int isroot, const char *runuser, const char *rungrou
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check_init(ast_json_init(), "libjansson");
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ast_ulaw_init();
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ast_alaw_init();
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ast_utf8_init();
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tdd_init();
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callerid_init();
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ast_builtins_init();
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@ -0,0 +1,380 @@
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/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2020, Sean Bright
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*
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* Sean Bright <sean.bright@gmail.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief UTF-8 information and validation functions
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include "asterisk/utils.h"
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#include "asterisk/utf8.h"
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#include "asterisk/test.h"
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/*
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* BEGIN THIRD PARTY CODE
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*
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* Copyright (c) 2008-2010 Björn Höhrmann <bjoern@hoehrmann.de>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details.
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*/
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#define UTF8_ACCEPT 0
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#define UTF8_REJECT 12
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static const uint8_t utf8d[] = {
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/* The first part of the table maps bytes to character classes that
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* to reduce the size of the transition table and create bitmasks. */
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8,
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/* The second part is a transition table that maps a combination
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* of a state of the automaton and a character class to a state. */
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0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12,
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12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12,
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12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12,
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12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12,
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12,36,12,12,12,12,12,12,12,12,12,12,
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};
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#if 0
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/* We can bring this back if we need the codepoint? */
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static uint32_t inline decode(uint32_t *state, uint32_t *codep, uint32_t byte) {
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uint32_t type = utf8d[byte];
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*codep = (*state != UTF8_ACCEPT) ?
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(byte & 0x3fu) | (*codep << 6) :
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(0xff >> type) & (byte);
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*state = utf8d[256 + *state + type];
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return *state;
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}
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#endif
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static uint32_t inline decode(uint32_t *state, uint32_t byte) {
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uint32_t type = utf8d[byte];
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*state = utf8d[256 + *state + type];
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return *state;
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}
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/*
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* END THIRD PARTY CODE
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*
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* See copyright notice above.
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*/
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int ast_utf8_is_valid(const char *src)
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{
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uint32_t state = UTF8_ACCEPT;
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while (*src) {
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decode(&state, (uint8_t) *src++);
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}
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return state == UTF8_ACCEPT;
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}
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int ast_utf8_is_validn(const char *src, size_t size)
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{
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uint32_t state = UTF8_ACCEPT;
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while (size && *src) {
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decode(&state, (uint8_t) *src++);
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size--;
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}
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return state == UTF8_ACCEPT;
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}
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void ast_utf8_copy_string(char *dst, const char *src, size_t size)
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{
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uint32_t state = UTF8_ACCEPT;
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char *last_good = dst;
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ast_assert(size > 0);
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while (size && *src) {
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if (decode(&state, (uint8_t) *src) == UTF8_REJECT) {
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/* We _could_ replace with U+FFFD and try to recover, but for now
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* we treat this the same as if we had run out of space */
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break;
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}
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*dst++ = *src++;
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size--;
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if (size && state == UTF8_ACCEPT) {
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/* last_good is where we will ultimately write the 0 byte */
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last_good = dst;
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}
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}
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*last_good = '\0';
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}
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struct ast_utf8_validator {
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uint32_t state;
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};
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int ast_utf8_validator_new(struct ast_utf8_validator **validator)
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{
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struct ast_utf8_validator *tmp = ast_malloc(sizeof(*tmp));
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if (!tmp) {
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return 1;
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}
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tmp->state = UTF8_ACCEPT;
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*validator = tmp;
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return 0;
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}
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enum ast_utf8_validation_result ast_utf8_validator_state(
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struct ast_utf8_validator *validator)
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{
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switch (validator->state) {
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case UTF8_ACCEPT:
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return AST_UTF8_VALID;
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case UTF8_REJECT:
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return AST_UTF8_INVALID;
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default:
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return AST_UTF8_UNKNOWN;
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}
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}
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enum ast_utf8_validation_result ast_utf8_validator_feed(
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struct ast_utf8_validator *validator, const char *data)
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{
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while (*data) {
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decode(&validator->state, (uint8_t) *data++);
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}
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return ast_utf8_validator_state(validator);
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}
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enum ast_utf8_validation_result ast_utf8_validator_feedn(
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struct ast_utf8_validator *validator, const char *data, size_t size)
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{
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while (size && *data) {
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decode(&validator->state, (uint8_t) *data++);
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size--;
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}
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return ast_utf8_validator_state(validator);
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}
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void ast_utf8_validator_reset(struct ast_utf8_validator *validator)
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{
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validator->state = UTF8_ACCEPT;
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}
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void ast_utf8_validator_destroy(struct ast_utf8_validator *validator)
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{
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ast_free(validator);
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}
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#ifdef TEST_FRAMEWORK
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AST_TEST_DEFINE(test_utf8_is_valid)
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{
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switch (cmd) {
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case TEST_INIT:
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info->name = "is_valid";
|
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info->category = "/main/utf8/";
|
||||
info->summary = "Test ast_utf8_is_valid and ast_utf8_is_validn";
|
||||
info->description =
|
||||
"Tests UTF-8 string validation code.";
|
||||
return AST_TEST_NOT_RUN;
|
||||
case TEST_EXECUTE:
|
||||
break;
|
||||
}
|
||||
|
||||
/* Valid UTF-8 */
|
||||
ast_test_validate(test, ast_utf8_is_valid("Asterisk"));
|
||||
ast_test_validate(test, ast_utf8_is_valid("\xce\xbb"));
|
||||
ast_test_validate(test, ast_utf8_is_valid("\xe2\x8a\x9b"));
|
||||
ast_test_validate(test, ast_utf8_is_valid("\xf0\x9f\x93\x9e"));
|
||||
|
||||
/* Valid with leading */
|
||||
ast_test_validate(test, ast_utf8_is_valid("aaa Asterisk"));
|
||||
ast_test_validate(test, ast_utf8_is_valid("aaa \xce\xbb"));
|
||||
ast_test_validate(test, ast_utf8_is_valid("aaa \xe2\x8a\x9b"));
|
||||
ast_test_validate(test, ast_utf8_is_valid("aaa \xf0\x9f\x93\x9e"));
|
||||
|
||||
/* Valid with trailing */
|
||||
ast_test_validate(test, ast_utf8_is_valid("Asterisk aaa"));
|
||||
ast_test_validate(test, ast_utf8_is_valid("\xce\xbb aaa"));
|
||||
ast_test_validate(test, ast_utf8_is_valid("\xe2\x8a\x9b aaa"));
|
||||
ast_test_validate(test, ast_utf8_is_valid("\xf0\x9f\x93\x9e aaa"));
|
||||
|
||||
/* Valid with leading and trailing */
|
||||
ast_test_validate(test, ast_utf8_is_valid("aaa Asterisk aaa"));
|
||||
ast_test_validate(test, ast_utf8_is_valid("aaa \xce\xbb aaa"));
|
||||
ast_test_validate(test, ast_utf8_is_valid("aaa \xe2\x8a\x9b aaa"));
|
||||
ast_test_validate(test, ast_utf8_is_valid("aaa \xf0\x9f\x93\x9e aaa"));
|
||||
|
||||
/* Valid if limited by number of bytes */
|
||||
ast_test_validate(test, ast_utf8_is_validn("Asterisk" "\xff", strlen("Asterisk")));
|
||||
ast_test_validate(test, ast_utf8_is_validn("\xce\xbb" "\xff", strlen("\xce\xbb")));
|
||||
ast_test_validate(test, ast_utf8_is_validn("\xe2\x8a\x9b" "\xff", strlen("\xe2\x8a\x9b")));
|
||||
ast_test_validate(test, ast_utf8_is_validn("\xf0\x9f\x93\x9e" "\xff", strlen("\xf0\x9f\x93\x9e")));
|
||||
|
||||
/* Invalid */
|
||||
ast_test_validate(test, !ast_utf8_is_valid("\xc0\x8a")); /* Overlong */
|
||||
ast_test_validate(test, !ast_utf8_is_valid("98.6\xa7")); /* 'High ASCII' */
|
||||
ast_test_validate(test, !ast_utf8_is_valid("\xc3\x28"));
|
||||
ast_test_validate(test, !ast_utf8_is_valid("\xa0\xa1"));
|
||||
ast_test_validate(test, !ast_utf8_is_valid("\xe2\x28\xa1"));
|
||||
ast_test_validate(test, !ast_utf8_is_valid("\xe2\x82\x28"));
|
||||
ast_test_validate(test, !ast_utf8_is_valid("\xf0\x28\x8c\xbc"));
|
||||
ast_test_validate(test, !ast_utf8_is_valid("\xf0\x90\x28\xbc"));
|
||||
ast_test_validate(test, !ast_utf8_is_valid("\xf0\x28\x8c\x28"));
|
||||
|
||||
return AST_TEST_PASS;
|
||||
}
|
||||
|
||||
static int test_copy_and_compare(const char *src, size_t dst_len, const char *cmp)
|
||||
{
|
||||
char dst[dst_len];
|
||||
ast_utf8_copy_string(dst, src, dst_len);
|
||||
return strcmp(dst, cmp) == 0;
|
||||
}
|
||||
|
||||
AST_TEST_DEFINE(test_utf8_copy_string)
|
||||
{
|
||||
switch (cmd) {
|
||||
case TEST_INIT:
|
||||
info->name = "copy_string";
|
||||
info->category = "/main/utf8/";
|
||||
info->summary = "Test ast_utf8_copy_string";
|
||||
info->description =
|
||||
"Tests UTF-8 string copying code.";
|
||||
return AST_TEST_NOT_RUN;
|
||||
case TEST_EXECUTE:
|
||||
break;
|
||||
}
|
||||
|
||||
ast_test_validate(test, test_copy_and_compare("Asterisk", 6, "Aster"));
|
||||
ast_test_validate(test, test_copy_and_compare("Asterisk \xc2\xae", 11, "Asterisk "));
|
||||
ast_test_validate(test, test_copy_and_compare("Asterisk \xc2\xae", 12, "Asterisk \xc2\xae"));
|
||||
ast_test_validate(test, test_copy_and_compare("Asterisk \xc0\x8a", 12, "Asterisk "));
|
||||
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 1, ""));
|
||||
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 2, ""));
|
||||
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 3, "\xce\xbb"));
|
||||
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 4, "\xce\xbb "));
|
||||
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 5, "\xce\xbb x"));
|
||||
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 6, "\xce\xbb xy"));
|
||||
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 7, "\xce\xbb xyz"));
|
||||
|
||||
return AST_TEST_PASS;
|
||||
}
|
||||
|
||||
AST_TEST_DEFINE(test_utf8_validator)
|
||||
{
|
||||
struct ast_utf8_validator *validator;
|
||||
|
||||
switch (cmd) {
|
||||
case TEST_INIT:
|
||||
info->name = "utf8_validator";
|
||||
info->category = "/main/utf8/";
|
||||
info->summary = "Test ast_utf8_validator";
|
||||
info->description =
|
||||
"Tests UTF-8 progressive validator code.";
|
||||
return AST_TEST_NOT_RUN;
|
||||
case TEST_EXECUTE:
|
||||
break;
|
||||
}
|
||||
|
||||
if (ast_utf8_validator_new(&validator)) {
|
||||
return AST_TEST_FAIL;
|
||||
}
|
||||
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "Asterisk") == AST_UTF8_VALID);
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "\xc2") == AST_UTF8_UNKNOWN);
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "\xae") == AST_UTF8_VALID);
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "Private") == AST_UTF8_VALID);
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "Branch") == AST_UTF8_VALID);
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "Exchange") == AST_UTF8_VALID);
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "\xe2") == AST_UTF8_UNKNOWN);
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "\x84") == AST_UTF8_UNKNOWN);
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "\xbb") == AST_UTF8_VALID);
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "\xc0\x8a") == AST_UTF8_INVALID);
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "valid") == AST_UTF8_INVALID);
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "valid") == AST_UTF8_INVALID);
|
||||
ast_test_validate(test, ast_utf8_validator_feed(validator, "valid") == AST_UTF8_INVALID);
|
||||
|
||||
ast_utf8_validator_destroy(validator);
|
||||
|
||||
return AST_TEST_PASS;
|
||||
}
|
||||
|
||||
static void test_utf8_shutdown(void)
|
||||
{
|
||||
AST_TEST_UNREGISTER(test_utf8_is_valid);
|
||||
AST_TEST_UNREGISTER(test_utf8_copy_string);
|
||||
AST_TEST_UNREGISTER(test_utf8_validator);
|
||||
}
|
||||
|
||||
int ast_utf8_init(void)
|
||||
{
|
||||
AST_TEST_REGISTER(test_utf8_is_valid);
|
||||
AST_TEST_REGISTER(test_utf8_copy_string);
|
||||
AST_TEST_REGISTER(test_utf8_validator);
|
||||
|
||||
ast_register_cleanup(test_utf8_shutdown);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#else /* !TEST_FRAMEWORK */
|
||||
|
||||
int ast_utf8_init(void)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue