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diff --git a/include/apr_escape.h b/include/apr_escape.h new file mode 100644 index 0000000..ed048c9 --- /dev/null +++ b/include/apr_escape.h @@ -0,0 +1,431 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +/** + * @file apr_escape.h + * @brief APR-UTIL Escaping + */ +#ifndef APR_ESCAPE_H +#define APR_ESCAPE_H +#include "apr.h" +#include "apr_general.h" +#ifdef __cplusplus +extern "C" { +#endif + +/** + * @defgroup APR_Util_Escaping Escape functions + * @ingroup APR + * @{ + */ + +/* Simple escape/unescape functions. + * + * The design goal of these functions are: + * + * - Avoid unnecessary work. + * + * In most cases the strings passed in do not need to be escaped at all. In + * these cases the original string will be returned. + * + * - Lowest possible memory footprint. + * + * The amount of memory allocated for a given encoding is calculated based + * on the exact amount of memory needed, and not the theoretical worst case + * scenario. + * + */ + +/** + * When passing a string to one of the escape functions, this value can be + * passed to indicate a string-valued key, and have the length computed + * automatically. + */ +#define APR_ESCAPE_STRING (-1) + +/** + * Apply LDAP distinguished name escaping as per RFC4514. + */ +#define APR_ESCAPE_LDAP_DN (0x01) + +/** + * Apply LDAP filter escaping as per RFC4515. + */ +#define APR_ESCAPE_LDAP_FILTER (0x02) + +/** + * Apply both RFC4514 and RFC4515 LDAP escaping. + */ +#define APR_ESCAPE_LDAP_ALL (0x03) + +/** + * Perform shell escaping on the provided string. + * + * Shell escaping causes characters to be prefixed with a '\' character. + * @param escaped Optional buffer to write the encoded string, can be + * NULL + * @param str The original string + * @param slen The length of the original string, or APR_ESCAPE_STRING + * @param len If present, returns the length of the string + * @return APR_SUCCESS, or APR_NOTFOUND if no changes to the string were + * detected or the string was NULL + */ +APR_DECLARE(apr_status_t) apr_escape_shell(char *escaped, const char *str, + apr_ssize_t slen, apr_size_t *len); + +/** + * Perform shell escaping on the provided string, returning the result + * from the pool. + * + * Shell escaping causes characters to be prefixed with a '\' character. + * + * If no characters were escaped, the original string is returned. + * @param p Pool to allocate from + * @param str The original string + * @return the encoded string, allocated from the pool, or the original + * string if no escaping took place or the string was NULL. + */ +APR_DECLARE(const char *) apr_pescape_shell(apr_pool_t *p, const char *str) + __attribute__((nonnull(1))); + +/** + * Unescapes a URL, leaving reserved characters intact. + * @param escaped Optional buffer to write the encoded string, can be + * NULL + * @param url String to be unescaped + * @param slen The length of the original url, or APR_ESCAPE_STRING + * @param forbid Optional list of forbidden characters, in addition to + * 0x00 + * @param reserved Optional list of reserved characters that will be + * left unescaped + * @param plus If non zero, '+' is converted to ' ' as per + * application/x-www-form-urlencoded encoding + * @param len If set, the length of the escaped string will be returned + * @return APR_SUCCESS on success, APR_NOTFOUND if no characters are + * decoded or the string is NULL, APR_EINVAL if a bad escape sequence is + * found, APR_BADCH if a character on the forbid list is found. + */ +APR_DECLARE(apr_status_t) apr_unescape_url(char *escaped, const char *url, + apr_ssize_t slen, const char *forbid, const char *reserved, int plus, + apr_size_t *len); + +/** + * Unescapes a URL, leaving reserved characters intact, returning the + * result from a pool. + * @param p Pool to allocate from + * @param url String to be unescaped in place + * @param forbid Optional list of forbidden characters, in addition to + * 0x00 + * @param reserved Optional list of reserved characters that will be + * left unescaped + * @param plus If non zero, '+' is converted to ' ' as per + * application/x-www-form-urlencoded encoding + * @return A string allocated from the pool on success, the original string + * if no characters are decoded, or NULL if a bad escape sequence is found + * or if a character on the forbid list is found, or if the original string + * was NULL. + */ +APR_DECLARE(const char *) apr_punescape_url(apr_pool_t *p, const char *url, + const char *forbid, const char *reserved, int plus) + __attribute__((nonnull(1))); + +/** + * Escape a path segment, as defined in RFC1808. + * @param escaped Optional buffer to write the encoded string, can be + * NULL + * @param str The original string + * @param slen The length of the original string, or APR_ESCAPE_STRING + * @param len If present, returns the length of the string + * @return APR_SUCCESS, or APR_NOTFOUND if no changes to the string were + * detected or the string was NULL + */ +APR_DECLARE(apr_status_t) apr_escape_path_segment(char *escaped, + const char *str, apr_ssize_t slen, apr_size_t *len); + +/** + * Escape a path segment, as defined in RFC1808, returning the result from a + * pool. + * @param p Pool to allocate from + * @param str String to be escaped + * @return A string allocated from the pool on success, the original string + * if no characters are encoded or the string is NULL. + */ +APR_DECLARE(const char *) apr_pescape_path_segment(apr_pool_t *p, + const char *str) __attribute__((nonnull(1))); + +/** + * Converts an OS path to a URL, in an OS dependent way, as defined in RFC1808. + * In all cases if a ':' occurs before the first '/' in the URL, the URL should + * be prefixed with "./" (or the ':' escaped). In the case of Unix, this means + * leaving '/' alone, but otherwise doing what escape_path_segment() does. For + * efficiency reasons, we don't use escape_path_segment(), which is provided for + * reference. Again, RFC 1808 is where this stuff is defined. + * + * If partial is set, os_escape_path() assumes that the path will be appended to + * something with a '/' in it (and thus does not prefix "./"). + * @param escaped Optional buffer to write the encoded string, can be + * NULL + * @param path The original string + * @param slen The length of the original string, or APR_ESCAPE_STRING + * @param partial If non zero, suppresses the prepending of "./" + * @param len If present, returns the length of the string + * @return APR_SUCCESS, or APR_NOTFOUND if no changes to the string were + * detected or if the string was NULL + */ +APR_DECLARE(apr_status_t) apr_escape_path(char *escaped, const char *path, + apr_ssize_t slen, int partial, apr_size_t *len); + +/** + * Converts an OS path to a URL, in an OS dependent way, as defined in RFC1808, + * returning the result from a pool. + * + * In all cases if a ':' occurs before the first '/' in the URL, the URL should + * be prefixed with "./" (or the ':' escaped). In the case of Unix, this means + * leaving '/' alone, but otherwise doing what escape_path_segment() does. For + * efficiency reasons, we don't use escape_path_segment(), which is provided for + * reference. Again, RFC 1808 is where this stuff is defined. + * + * If partial is set, os_escape_path() assumes that the path will be appended to + * something with a '/' in it (and thus does not prefix "./"). + * @param p Pool to allocate from + * @param str The original string + * @param partial If non zero, suppresses the prepending of "./" + * @return A string allocated from the pool on success, the original string + * if no characters are encoded or if the string was NULL. + */ +APR_DECLARE(const char *) apr_pescape_path(apr_pool_t *p, const char *str, + int partial) __attribute__((nonnull(1))); + +/** + * Urlencode a string, as defined in + * http://www.w3.org/TR/html401/interact/forms.html#h-17.13.4.1. + * @param escaped Optional buffer to write the encoded string, can be + * NULL + * @param str The original string + * @param slen The length of the original string, or APR_ESCAPE_STRING + * @param len If present, returns the length of the string + * @return APR_SUCCESS, or APR_NOTFOUND if no changes to the string were + * detected or if the stirng was NULL + */ +APR_DECLARE(apr_status_t) apr_escape_urlencoded(char *escaped, const char *str, + apr_ssize_t slen, apr_size_t *len); + +/** + * Urlencode a string, as defined in + * http://www.w3.org/TR/html401/interact/forms.html#h-17.13.4.1, returning + * the result from a pool. + * @param p Pool to allocate from + * @param str String to be escaped + * @return A string allocated from the pool on success, the original string + * if no characters are encoded or if the string was NULL. + */ +APR_DECLARE(const char *) apr_pescape_urlencoded(apr_pool_t *p, + const char *str) __attribute__((nonnull(1))); + +/** + * Apply entity encoding to a string. Characters are replaced as follows: + * '<' becomes '\<', '>' becomes '\>', '&' becomes '\&', the + * double quote becomes '\"" and the single quote becomes '\''. + * + * If toasc is not zero, any non ascii character will be encoded as + * '%\#ddd;', where ddd is the decimal code of the character. + * @param escaped Optional buffer to write the encoded string, can be + * NULL + * @param str The original string + * @param slen The length of the original string, or APR_ESCAPE_STRING + * @param toasc If non zero, encode non ascii characters + * @param len If present, returns the length of the string + * @return APR_SUCCESS, or APR_NOTFOUND if no changes to the string were + * detected or the string was NULL + */ +APR_DECLARE(apr_status_t) apr_escape_entity(char *escaped, const char *str, + apr_ssize_t slen, int toasc, apr_size_t *len); + +/** + * Apply entity encoding to a string, returning the result from a pool. + * Characters are replaced as follows: '<' becomes '\<', '>' becomes + * '\>', '&' becomes '\&', the double quote becomes '\"" and the + * single quote becomes '\''. + * @param p Pool to allocate from + * @param str The original string + * @param toasc If non zero, encode non ascii characters + * @return A string allocated from the pool on success, the original string + * if no characters are encoded or the string is NULL. + */ +APR_DECLARE(const char *) apr_pescape_entity(apr_pool_t *p, const char *str, + int toasc) __attribute__((nonnull(1))); + +/** + * Decodes html entities or numeric character references in a string. If + * the string to be unescaped is syntactically incorrect, then the + * following fixups will be made: + * unknown entities will be left undecoded; + * references to unused numeric characters will be deleted. + * In particular, � will not be decoded, but will be deleted. + * @param unescaped Optional buffer to write the encoded string, can be + * NULL + * @param str The original string + * @param slen The length of the original string, or APR_ESCAPE_STRING + * @param len If present, returns the length of the string + * @return APR_SUCCESS, or APR_NOTFOUND if no changes to the string were + * detected or the string was NULL + */ +APR_DECLARE(apr_status_t) apr_unescape_entity(char *unescaped, const char *str, + apr_ssize_t slen, apr_size_t *len); + +/** + * Decodes html entities or numeric character references in a string. If + * the string to be unescaped is syntactically incorrect, then the + * following fixups will be made: + * unknown entities will be left undecoded; + * references to unused numeric characters will be deleted. + * In particular, � will not be decoded, but will be deleted. + * @param p Pool to allocate from + * @param str The original string + * @return A string allocated from the pool on success, the original string + * if no characters are encoded or the string is NULL. + */ +APR_DECLARE(const char *) apr_punescape_entity(apr_pool_t *p, const char *str) + __attribute__((nonnull(1))); + +/** + * Escape control characters in a string, as performed by the shell's + * 'echo' command. Characters are replaced as follows: + * \\a alert (bell), \\b backspace, \\f form feed, \\n new line, \\r carriage + * return, \\t horizontal tab, \\v vertical tab, \\ backslash. + * + * Any non ascii character will be encoded as '\\xHH', where HH is the hex + * code of the character. + * + * If quote is not zero, the double quote character will also be escaped. + * @param escaped Optional buffer to write the encoded string, can be + * NULL + * @param str The original string + * @param slen The length of the original string, or APR_ESCAPE_STRING + * @param quote If non zero, encode double quotes + * @param len If present, returns the length of the string + * @return APR_SUCCESS, or APR_NOTFOUND if no changes to the string were + * detected or the string was NULL + */ +APR_DECLARE(apr_status_t) apr_escape_echo(char *escaped, const char *str, + apr_ssize_t slen, int quote, apr_size_t *len); + +/** + * Escape control characters in a string, as performed by the shell's + * 'echo' command, and return the results from a pool. Characters are + * replaced as follows: \\a alert (bell), \\b backspace, \\f form feed, + * \\n new line, \\r carriage return, \\t horizontal tab, \\v vertical tab, + * \\ backslash. + * + * Any non ascii character will be encoded as '\\xHH', where HH is the hex + * code of the character. + * + * If quote is not zero, the double quote character will also be escaped. + * @param p Pool to allocate from + * @param str The original string + * @param quote If non zero, encode double quotes + * @return A string allocated from the pool on success, the original string + * if no characters are encoded or the string is NULL. + */ +APR_DECLARE(const char *) apr_pescape_echo(apr_pool_t *p, const char *str, + int quote); + +/** + * Convert binary data to a hex encoding. + * @param dest The destination buffer, can be NULL + * @param src The original buffer + * @param srclen The length of the original buffer + * @param colon If not zero, insert colon characters between hex digits. + * @param len If present, returns the length of the string + * @return APR_SUCCESS, or APR_NOTFOUND if the string was NULL + */ +APR_DECLARE(apr_status_t) apr_escape_hex(char *dest, const void *src, + apr_size_t srclen, int colon, apr_size_t *len); + +/** + * Convert binary data to a hex encoding, and return the results from a + * pool. + * @param p Pool to allocate from + * @param src The original buffer + * @param slen The length of the original buffer + * @param colon If not zero, insert colon characters between hex digits. + * @return A zero padded buffer allocated from the pool on success, or + * NULL if src was NULL. + */ +APR_DECLARE(const char *) apr_pescape_hex(apr_pool_t *p, const void *src, + apr_size_t slen, int colon) __attribute__((nonnull(1))); + +/** + * Convert hex encoded string to binary data. + * @param dest The destination buffer, can be NULL + * @param str The original buffer + * @param slen The length of the original buffer + * @param colon If not zero, ignore colon characters between hex digits. + * @param len If present, returns the length of the string + * @return APR_SUCCESS, or APR_NOTFOUND if the string was NULL, or APR_BADCH + * if a non hex character is present. + */ +APR_DECLARE(apr_status_t) apr_unescape_hex(void *dest, const char *str, + apr_ssize_t slen, int colon, apr_size_t *len); + +/** + * Convert hex encoding to binary data, and return the results from a pool. + * If the colon character appears between pairs of hex digits, it will be + * ignored. + * @param p Pool to allocate from + * @param str The original string + * @param colon If not zero, ignore colon characters between hex digits. + * @param len If present, returns the length of the final buffer + * @return A buffer allocated from the pool on success, or NULL if src was + * NULL, or a bad character was present. + */ +APR_DECLARE(const void *) apr_punescape_hex(apr_pool_t *p, const char *str, + int colon, apr_size_t *len); + +/** + * Apply LDAP escaping to binary data. Characters from RFC4514 and RFC4515 + * are escaped with their hex equivalents. + * @param dest The destination buffer, can be NULL + * @param src The original buffer + * @param srclen The length of the original buffer + * @param flags APR_ESCAPE_LDAP_DN for RFC4514, APR_ESCAPE_LDAP_FILTER for + * RFC4515, APR_ESCAPE_LDAP_ALL for both + * @param len If present, returns the length of the string + * @return APR_SUCCESS, or APR_NOTFOUND if the string was NULL + */ +APR_DECLARE(apr_status_t) apr_escape_ldap(char *dest, const void *src, + apr_ssize_t srclen, int flags, apr_size_t *len); + +/** + * Apply LDAP escaping to binary data, and return the results from a + * pool. Characters from RFC4514 and RFC4515 are escaped with their hex + * equivalents. + * @param p Pool to allocate from + * @param src The original buffer + * @param slen The length of the original buffer + * @param flags APR_ESCAPE_LDAP_DN for RFC4514, APR_ESCAPE_LDAP_FILTER for + * RFC4515, APR_ESCAPE_LDAP_ALL for both + * @return A zero padded buffer allocated from the pool on success, or + * NULL if src was NULL. + */ +APR_DECLARE(const char *) apr_pescape_ldap(apr_pool_t *p, const void *src, + apr_ssize_t slen, int flags) __attribute__((nonnull(1))); + +/** @} */ +#ifdef __cplusplus +} +#endif + +#endif /* !APR_ESCAPE_H */ |