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/*
This file is part of GNUnet.
Copyright (C) 2001-2013 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
#if ! defined (__GNUNET_UTIL_LIB_H_INSIDE__)
#error "Only <gnunet_util_lib.h> can be included directly."
#endif
/**
* @addtogroup libgnunetutil
* Multi-function utilities library for GNUnet programs
* @{
*
* @author Christian Grothoff
* @author Krista Bennett
* @author Gerd Knorr <kraxel@bytesex.org>
* @author Ioana Patrascu
* @author Tzvetan Horozov
*
* @file
* Strings and string handling functions
*
* @defgroup strings Strings library
* Strings and string handling functions, including malloc and string tokenizing.
* @{
*/
#if ! defined (__GNUNET_UTIL_LIB_H_INSIDE__)
#error "Only <gnunet_util_lib.h> can be included directly."
#endif
#ifndef GNUNET_STRINGS_LIB_H
#define GNUNET_STRINGS_LIB_H
/* we need size_t, and since it can be both unsigned int
or unsigned long long, this IS platform dependent;
but "stdlib.h" should be portable 'enough' to be
unconditionally available... */
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
#include "gnunet_time_lib.h"
/**
* Convert a given fancy human-readable size to bytes.
*
* @param fancy_size human readable string (e.g. 1 MB)
* @param size set to the size in bytes
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_fancy_size_to_bytes (const char *fancy_size,
unsigned long long *size);
/**
* Convert a given fancy human-readable time to our internal
* representation.
*
* @param fancy_time human readable string (e.g. 1 minute)
* @param rtime set to the relative time
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_fancy_time_to_relative (const char *fancy_time,
struct GNUNET_TIME_Relative *rtime);
/**
* @ingroup time
* Convert a given fancy human-readable time to our internal
* representation. The human-readable time is expected to be
* in local time, whereas the returned value will be in UTC.
*
* @param fancy_time human readable string (e.g. %Y-%m-%d %H:%M:%S)
* @param atime set to the absolute time
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_fancy_time_to_absolute (const char *fancy_time,
struct GNUNET_TIME_Absolute *atime);
/**
* @ingroup time
* Convert a given fancy human-readable time to our internal
* representation. The human-readable time is expected to be
* in local time, whereas the returned value will be in UTC.
*
* @param fancy_time human readable string (e.g. %Y-%m-%d %H:%M:%S)
* @param atime set to the absolute time
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_fancy_time_to_timestamp (const char *fancy_time,
struct GNUNET_TIME_Timestamp *atime);
/**
* Convert a given filesize into a fancy human-readable format.
*
* @param size number of bytes
* @return fancy representation of the size (possibly rounded) for humans
*/
char *
GNUNET_STRINGS_byte_size_fancy (unsigned long long size);
/**
* Convert the len characters long character sequence
* given in input that is in the given input charset
* to a string in given output charset.
*
* @param input input string
* @param len number of bytes in @a input
* @param input_charset character set used for @a input
* @param output_charset desired character set for the return value
* @return the converted string (0-terminated),
* if conversion fails, a copy of the original
* string is returned.
*/
char *
GNUNET_STRINGS_conv (const char *input,
size_t len,
const char *input_charset,
const char *output_charset);
/**
* Convert the len characters long character sequence
* given in input that is in the given charset
* to UTF-8.
*
* @param input the input string (not necessarily 0-terminated)
* @param len the number of bytes in the @a input
* @param charset character set to convert from
* @return the converted string (0-terminated)
*/
char *
GNUNET_STRINGS_to_utf8 (const char *input,
size_t len,
const char *charset);
/**
* Normalize the utf-8 input string to NFC.
*
* @param input input string
* @return result (freshly allocated) or NULL on error.
*/
char*
GNUNET_STRINGS_utf8_normalize (const char *input);
/**
* Convert the len bytes-long UTF-8 string
* given in input to the given charset.
*
* @param input the input string (not necessarily 0-terminated)
* @param len the number of bytes in the @a input
* @param charset character set to convert to
* @return the converted string (0-terminated),
* if conversion fails, a copy of the original
* string is returned.
*/
char *
GNUNET_STRINGS_from_utf8 (const char *input,
size_t len,
const char *charset);
/**
* Convert the utf-8 input string to lower case.
* Output needs to be allocated appropriately.
*
* @param input input string
* @param output output buffer
* @return GNUNET_OK on success
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_utf8_tolower (const char *input,
char *output);
/**
* Convert the utf-8 input string to upper case.
* Output needs to be allocated appropriately.
*
* @param input input string
* @param output output buffer
* @return #GNUNET_OK on success
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_utf8_toupper (const char *input,
char *output);
/**
* Complete filename (a la shell) from abbrevition.
*
* @param fil the name of the file, may contain ~/ or
* be relative to the current directory
* @return the full file name,
* NULL is returned on error
*/
char *
GNUNET_STRINGS_filename_expand (const char *fil);
/**
* Fill a buffer of the given size with count 0-terminated strings
* (given as varargs). If "buffer" is NULL, only compute the amount
* of space required (sum of "strlen(arg)+1").
*
* Unlike using "snprintf" with "%s", this function will add
* 0-terminators after each string. The
* "GNUNET_string_buffer_tokenize" function can be used to parse the
* buffer back into individual strings.
*
* @param buffer the buffer to fill with strings, can
* be NULL in which case only the necessary
* amount of space will be calculated
* @param size number of bytes available in buffer
* @param count number of strings that follow
* @param ... count 0-terminated strings to copy to buffer
* @return number of bytes written to the buffer
* (or number of bytes that would have been written)
*/
size_t
GNUNET_STRINGS_buffer_fill (char *buffer,
size_t size,
unsigned int count,
...);
/**
* Given a buffer of a given size, find "count" 0-terminated strings
* in the buffer and assign the count (varargs) of type "const char**"
* to the locations of the respective strings in the buffer.
*
* @param buffer the buffer to parse
* @param size size of the @a buffer
* @param count number of strings to locate
* @param ... pointers to where to store the strings
* @return offset of the character after the last 0-termination
* in the buffer, or 0 on error.
*/
unsigned int
GNUNET_STRINGS_buffer_tokenize (const char *buffer,
size_t size,
unsigned int count, ...);
/**
* @ingroup time
* Like `asctime`, except for GNUnet time. Converts a GNUnet internal
* absolute time (which is in UTC) to a string in local time.
* Note that the returned value will be overwritten if this function
* is called again.
*
* @param t the absolute time to convert
* @return timestamp in human-readable form in local time
*/
const char *
GNUNET_STRINGS_absolute_time_to_string (struct GNUNET_TIME_Absolute t);
/**
* @ingroup time
* Give relative time in human-readable fancy format.
* This is one of the very few calls in the entire API that is
* NOT reentrant!
*
* @param delta time in milli seconds
* @param do_round are we allowed to round a bit?
* @return string in human-readable form
*/
const char *
GNUNET_STRINGS_relative_time_to_string (struct GNUNET_TIME_Relative delta,
int do_round);
/**
* "man basename"
* Returns a pointer to a part of filename (allocates nothing)!
*
* @param filename filename to extract basename from
* @return short (base) name of the file (that is, everything following the
* last directory separator in filename. If filename ends with a
* directory separator, the result will be a zero-length string.
* If filename has no directory separators, the result is filename
* itself.
*/
const char *
GNUNET_STRINGS_get_short_name (const char *filename);
/**
* Convert binary data to ASCII encoding using CrockfordBase32.
* Does not append 0-terminator, but returns a pointer to the place where
* it should be placed, if needed.
*
* @param data data to encode
* @param size size of data (in bytes)
* @param out buffer to fill
* @param out_size size of the buffer. Must be large enough to hold
* ((size*8) + (((size*8) % 5) > 0 ? 5 - ((size*8) % 5) : 0)) / 5
* @return pointer to the next byte in 'out' or NULL on error.
*/
char *
GNUNET_STRINGS_data_to_string (const void *data,
size_t size,
char *out,
size_t out_size);
/**
* Return the base32crockford encoding of the given buffer.
*
* The returned string will be freshly allocated, and must be free'd
* with #GNUNET_free().
*
* @param buf buffer with data
* @param size size of the buffer @a buf
* @return freshly allocated, null-terminated string
*/
char *
GNUNET_STRINGS_data_to_string_alloc (const void *buf,
size_t size);
/**
* Convert CrockfordBase32 encoding back to data.
* @a out_size must match exactly the size of the data before it was encoded.
*
* @param enc the encoding
* @param enclen number of characters in @a enc (without 0-terminator, which can be missing)
* @param out location where to store the decoded data
* @param out_size size of the output buffer @a out
* @return #GNUNET_OK on success, #GNUNET_SYSERR if result has the wrong encoding
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_string_to_data (const char *enc,
size_t enclen,
void *out,
size_t out_size);
/**
* Convert CrockfordBase32 encoding back to data.
* @a out_size will be determined from @a enc and
* @a out will be allocated to be large enough.
*
* @param enc the encoding
* @param enclen number of characters in @a enc (without 0-terminator, which can be missing)
* @param[out] out location where to allocate and store the decoded data
* @param[out] out_size set to the size of the output buffer @a out
* @return #GNUNET_OK on success, #GNUNET_SYSERR if result has the wrong encoding
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_string_to_data_alloc (const char *enc,
size_t enclen,
void **out,
size_t *out_size);
/**
* Encode into Base64.
*
* @param data the data to encode
* @param len the length of the input
* @param output where to write the output (*output should be NULL,
* is allocated)
* @return the size of the output
*/
size_t
GNUNET_STRINGS_base64_encode (const void *in,
size_t len,
char **output);
/**
* url/percent encode (RFC3986).
*
* FIXME: awkward API, @a len is not actually used
* @a out is 0-terminated, should probably be changed
* to only input @a data and directly return @out or NULL.
*
* @param data the data to decode
* @param len the length of the input
* @param out where to write the output (*out should be NULL,
* is allocated)
* @return the size of the output
*/
size_t
GNUNET_STRINGS_urlencode (size_t len,
const char data[static len],
char **out);
/**
* Encode into Base64url. RFC7515
*
* @param in the data to encode
* @param len the length of the input
* @param output where to write the output (*output should be NULL,
* is allocated)
* @return the size of the output
*/
size_t
GNUNET_STRINGS_base64url_encode (const void *in,
size_t len,
char **output);
/**
* Decode from Base64.
*
* @param data the data to encode
* @param len the length of the input
* @param[out] output where to write the output (*output should be NULL,
* is allocated)
* @return the size of the output
*/
size_t
GNUNET_STRINGS_base64_decode (const char *data,
size_t len,
void **output);
/**
* Decode from Base64url. RFC7515
*
* @param data the data to decode
* @param len the length of the input
* @param out where to write the output (*out should be NULL,
* is allocated)
* @return the size of the output
*/
size_t
GNUNET_STRINGS_base64url_decode (const char *data,
size_t len,
void **out);
/**
* url/percent encode (RFC3986).
*
* @param data the data to encode
* @param len the length of the input
* @param[out] out where to write the output (*output should be NULL,
* is allocated)
* @return the size of the output
*/
size_t
GNUNET_STRINGS_urldecode (const char *data,
size_t len,
char **out);
/**
* Parse a path that might be an URI.
*
* @param path path to parse. Must be NULL-terminated.
* @param[out] scheme_part pointer to a string that
* represents the URI scheme will be stored. Can be NULL. The string is
* allocated by the function, and should be freed by GNUNET_free() when
* it is no longer needed.
* @param path_part a pointer to 'const char *' where a pointer to the path
* part of the URI will be stored. Can be NULL. Points to the same block
* of memory as @a path, and thus must not be freed. Might point to '\0',
* if path part is zero-length.
* @return #GNUNET_YES if it's an URI, #GNUNET_NO otherwise. If 'path' is not
* an URI, '* scheme_part' and '*path_part' will remain unchanged
* (if they weren't NULL).
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_parse_uri (const char *path,
char **scheme_part,
const char **path_part);
/**
* Check whether filename is absolute or not, and if it's an URI
*
* @param filename filename to check
* @param can_be_uri #GNUNET_YES to check for being URI, #GNUNET_NO - to
* assume it's not URI
* @param r_is_uri a pointer to an int that is set to #GNUNET_YES if 'filename'
* is URI and to GNUNET_NO otherwise. Can be NULL. If 'can_be_uri' is
* not #GNUNET_YES, *r_is_uri is set to #GNUNET_NO.
* @param r_uri_scheme a pointer to a char * that is set to a pointer to URI scheme.
* The string is allocated by the function, and should be freed with
* GNUNET_free (). Can be NULL.
* @return #GNUNET_YES if 'filename' is absolute, #GNUNET_NO otherwise.
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_path_is_absolute (const char *filename,
int can_be_uri,
int *r_is_uri,
char **r_uri_scheme);
/**
* Flags for what we should check a file for.
*/
enum GNUNET_STRINGS_FilenameCheck
{
/**
* Check that it exists.
*/
GNUNET_STRINGS_CHECK_EXISTS = 0x00000001,
/**
* Check that it is a directory.
*/
GNUNET_STRINGS_CHECK_IS_DIRECTORY = 0x00000002,
/**
* Check that it is a link.
*/
GNUNET_STRINGS_CHECK_IS_LINK = 0x00000004,
/**
* Check that the path is an absolute path.
*/
GNUNET_STRINGS_CHECK_IS_ABSOLUTE = 0x00000008
};
/**
* Perform checks on @a filename. FIXME: some duplication with
* "GNUNET_DISK_"-APIs. We should unify those.
*
* @param filename file to check
* @param checks checks to perform
* @return #GNUNET_YES if all checks pass, #GNUNET_NO if at least one of them
* fails, #GNUNET_SYSERR when a check can't be performed
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_check_filename (const char *filename,
enum GNUNET_STRINGS_FilenameCheck checks);
/**
* Tries to convert @a zt_addr string to an IPv6 address.
* The string is expected to have the format "[ABCD::01]:80".
*
* @param zt_addr 0-terminated string. May be mangled by the function.
* @param addrlen length of zt_addr (not counting 0-terminator).
* @param r_buf a buffer to fill. Initially gets filled with zeroes,
* then its sin6_port, sin6_family and sin6_addr are set appropriately.
* @return #GNUNET_OK if conversion succeeded. #GNUNET_SYSERR otherwise, in which
* case the contents of r_buf are undefined.
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_to_address_ipv6 (const char *zt_addr,
size_t addrlen,
struct sockaddr_in6 *r_buf);
/**
* Tries to convert @a zt_addr string to an IPv4 address.
* The string is expected to have the format "1.2.3.4:80".
*
* @param zt_addr 0-terminated string. May be mangled by the function.
* @param addrlen length of zt_addr (not counting 0-terminator).
* @param r_buf a buffer to fill.
* @return #GNUNET_OK if conversion succeeded. #GNUNET_SYSERR otherwise, in which case
* the contents of r_buf are undefined.
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_to_address_ipv4 (const char *zt_addr,
size_t addrlen,
struct sockaddr_in *r_buf);
/**
* Parse an address given as a string into a
* `struct sockaddr`.
*
* @param addr the address
* @param[out] af set to the parsed address family (e.g. AF_INET)
* @param[out] sa set to the parsed address
* @return 0 on error, otherwise number of bytes in @a sa
*/
size_t
GNUNET_STRINGS_parse_socket_addr (const char *addr,
uint8_t *af,
struct sockaddr **sa);
/**
* Tries to convert @a addr string to an IP (v4 or v6) address.
* Will automatically decide whether to treat 'addr' as v4 or v6 address.
*
* @param addr a string, may not be 0-terminated.
* @param addrlen number of bytes in @a addr (if addr is 0-terminated,
* 0-terminator should not be counted towards addrlen).
* @param r_buf a buffer to fill.
* @return #GNUNET_OK if conversion succeeded. #GNUNET_SYSERR otherwise, in which
* case the contents of r_buf are undefined.
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_to_address_ip (const char *addr,
uint16_t addrlen,
struct sockaddr_storage *r_buf);
/**
* Returns utf-8 encoded arguments. Does nothing (returns a copy of
* @a argc and @a argv) on any platform other than W32. Returned @a
* argv has `u8argv[u8argc] == NULL`. Returned @a argv is a single
* memory block, and can be freed with a single GNUNET_free() call.
*
* @param argc argc (as given by main())
* @param argv argv (as given by main())
* @param u8argc a location to store new argc in (though it's th same as argc)
* @param u8argv a location to store new argv in
* @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
*/
enum GNUNET_GenericReturnValue
GNUNET_STRINGS_get_utf8_args (int argc,
char *const *argv,
int *u8argc,
char *const **u8argv);
/**
* Like strlcpy but portable. The given string @a src is copied in full length
* (until its null byte). The destination buffer is guaranteed to be
* null-terminated.
*
* to a destination buffer
* and ensures that the destination string is null-terminated.
*
* @param dst destination of the copy
* @param src source of the copy, must be null-terminated
* @param n the length of the string to copy, including its terminating null
* byte
* @return the length of the string that was copied, excluding the terminating
* null byte
*/
size_t
GNUNET_strlcpy (char *dst,
const char *src,
size_t n);
/**
* Sometimes we use the binary name to determine which specific
* test to run. In those cases, the string after the last "_"
* in 'argv[0]' specifies a string that determines the configuration
* file or plugin to use.
*
* This function returns the respective substring, taking care
* of issues such as binaries ending in '.exe' on W32.
*
* @param argv0 the name of the binary
* @return string between the last '_' and the '.exe' (or the end of the string),
* NULL if argv0 has no '_'
*/
char *
GNUNET_STRINGS_get_suffix_from_binary_name (const char *argv0);
/* ***************** IPv4/IPv6 parsing ****************** */
struct GNUNET_STRINGS_PortPolicy
{
/**
* Starting port range (0 if none given).
*/
uint16_t start_port;
/**
* End of port range (0 if none given).
*/
uint16_t end_port;
/**
* #GNUNET_YES if the port range should be negated
* ("!" in policy).
*/
int negate_portrange;
};
/**
* @brief IPV4 network in CIDR notation.
*/
struct GNUNET_STRINGS_IPv4NetworkPolicy
{
/**
* IPv4 address.
*/
struct in_addr network;
/**
* IPv4 netmask.
*/
struct in_addr netmask;
/**
* Policy for port access.
*/
struct GNUNET_STRINGS_PortPolicy pp;
};
/**
* @brief network in CIDR notation for IPV6.
*/
struct GNUNET_STRINGS_IPv6NetworkPolicy
{
/**
* IPv6 address.
*/
struct in6_addr network;
/**
* IPv6 netmask.
*/
struct in6_addr netmask;
/**
* Policy for port access.
*/
struct GNUNET_STRINGS_PortPolicy pp;
};
/**
* Parse an IPv4 network policy. The argument specifies a list of
* subnets. The format is <tt>(network[/netmask][:[!]SPORT-DPORT];)*</tt>
* (no whitespace, must be terminated with a semicolon). The network
* must be given in dotted-decimal notation. The netmask can be given
* in CIDR notation (/16) or in dotted-decimal (/255.255.0.0).
*
* @param routeListX a string specifying the IPv4 subnets
* @return the converted list, terminated with all zeros;
* NULL if the synatx is flawed
*/
struct GNUNET_STRINGS_IPv4NetworkPolicy *
GNUNET_STRINGS_parse_ipv4_policy (const char *routeListX);
/**
* Parse an IPv6 network policy. The argument specifies a list of
* subnets. The format is <tt>(network[/netmask[:[!]SPORT[-DPORT]]];)*</tt>
* (no whitespace, must be terminated with a semicolon). The network
* must be given in colon-hex notation. The netmask must be given in
* CIDR notation (/16) or can be omitted to specify a single host.
* Note that the netmask is mandatory if ports are specified.
*
* @param routeListX a string specifying the policy
* @return the converted list, 0-terminated, NULL if the synatx is flawed
*/
struct GNUNET_STRINGS_IPv6NetworkPolicy *
GNUNET_STRINGS_parse_ipv6_policy (const char *routeListX);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
/* ifndef GNUNET_UTIL_STRING_H */
#endif
/** @} */ /* end of group */
/** @} */ /* end of group addition */
/* end of gnunet_util_string.h */
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