/* This file is part of GNUnet. Copyright (C) 2005-2017 GNUnet e.V. GNUnet is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, 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 General Public License for more details. You should have received a copy of the GNU General Public License along with GNUnet; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /** * @file util/strings.c * @brief string functions * @author Nils Durner * @author Christian Grothoff */ #include "platform.h" #if HAVE_ICONV #include #endif #include "gnunet_crypto_lib.h" #include "gnunet_strings_lib.h" #include #include #include #define LOG(kind,...) GNUNET_log_from (kind, "util-strings", __VA_ARGS__) #define LOG_STRERROR(kind,syscall) GNUNET_log_from_strerror (kind, "util-strings", syscall) /** * 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, ...) { size_t needed; size_t slen; const char *s; va_list ap; needed = 0; va_start (ap, count); while (count > 0) { s = va_arg (ap, const char *); slen = strlen (s) + 1; if (buffer != NULL) { GNUNET_assert (needed + slen <= size); GNUNET_memcpy (&buffer[needed], s, slen); } needed += slen; count--; } va_end (ap); return needed; } /** * Convert a peer path to a human-readable string. * * @param pids array of PIDs to convert to a string * @param num_pids length of the @a pids array * @return string representing the array of @a pids */ char * GNUNET_STRINGS_pp2s (const struct GNUNET_PeerIdentity *pids, unsigned int num_pids) { char *buf; size_t off; size_t plen = num_pids * 5 + 1; off = 0; buf = GNUNET_malloc (plen); for (unsigned int i = 0; i < num_pids; i++) { off += GNUNET_snprintf (&buf[off], plen - off, "%s%s", GNUNET_i2s (&pids[i]), (i == num_pids -1) ? "" : "-"); } return buf; } /** * 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 buffer * @param count number of strings to locate * @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, ...) { unsigned int start; unsigned int needed; const char **r; va_list ap; needed = 0; va_start (ap, count); while (count > 0) { r = va_arg (ap, const char **); start = needed; while ((needed < size) && (buffer[needed] != '\0')) needed++; if (needed == size) { va_end (ap); return 0; /* error */ } *r = &buffer[start]; needed++; /* skip 0-termination */ count--; } va_end (ap); return needed; } /** * 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) { const char *unit = _( /* size unit */ "b"); char *ret; if (size > 5 * 1024) { size = size / 1024; unit = "KiB"; if (size > 5 * 1024) { size = size / 1024; unit = "MiB"; if (size > 5 * 1024) { size = size / 1024; unit = "GiB"; if (size > 5 * 1024) { size = size / 1024; unit = "TiB"; } } } } ret = GNUNET_malloc (32); GNUNET_snprintf (ret, 32, "%llu %s", size, unit); return ret; } /** * Unit conversion table entry for 'convert_with_table'. */ struct ConversionTable { /** * Name of the unit (or NULL for end of table). */ const char *name; /** * Factor to apply for this unit. */ unsigned long long value; }; /** * Convert a string of the form "4 X 5 Y" into a numeric value * by interpreting "X" and "Y" as units and then multiplying * the numbers with the values associated with the respective * unit from the conversion table. * * @param input input string to parse * @param table table with the conversion of unit names to numbers * @param output where to store the result * @return #GNUNET_OK on success, #GNUNET_SYSERR on error */ static int convert_with_table (const char *input, const struct ConversionTable *table, unsigned long long *output) { unsigned long long ret; char *in; const char *tok; unsigned long long last; unsigned int i; ret = 0; last = 0; in = GNUNET_strdup (input); for (tok = strtok (in, " "); tok != NULL; tok = strtok (NULL, " ")) { do { i = 0; while ((table[i].name != NULL) && (0 != strcasecmp (table[i].name, tok))) i++; if (table[i].name != NULL) { last *= table[i].value; break; /* next tok */ } else { char *endptr; ret += last; errno = 0; last = strtoull (tok, &endptr, 10); if ((0 != errno) || (endptr == tok)) { GNUNET_free (in); return GNUNET_SYSERR; /* expected number */ } if ('\0' == endptr[0]) break; /* next tok */ else tok = endptr; /* and re-check (handles times like "10s") */ } } while (GNUNET_YES); } ret += last; *output = ret; GNUNET_free (in); return GNUNET_OK; } /** * Convert a given fancy human-readable size to bytes. * * @param fancy_size human readable string (i.e. 1 MB) * @param size set to the size in bytes * @return #GNUNET_OK on success, #GNUNET_SYSERR on error */ int GNUNET_STRINGS_fancy_size_to_bytes (const char *fancy_size, unsigned long long *size) { static const struct ConversionTable table[] = { { "B", 1}, { "KiB", 1024}, { "kB", 1000}, { "MiB", 1024 * 1024}, { "MB", 1000 * 1000}, { "GiB", 1024 * 1024 * 1024}, { "GB", 1000 * 1000 * 1000}, { "TiB", 1024LL * 1024LL * 1024LL * 1024LL}, { "TB", 1000LL * 1000LL * 1000LL * 1024LL}, { "PiB", 1024LL * 1024LL * 1024LL * 1024LL * 1024LL}, { "PB", 1000LL * 1000LL * 1000LL * 1024LL * 1000LL}, { "EiB", 1024LL * 1024LL * 1024LL * 1024LL * 1024LL * 1024LL}, { "EB", 1000LL * 1000LL * 1000LL * 1024LL * 1000LL * 1000LL}, { NULL, 0} }; return convert_with_table (fancy_size, table, size); } /** * Convert a given fancy human-readable time to our internal * representation. * * @param fancy_time human readable string (i.e. 1 minute) * @param rtime set to the relative time * @return #GNUNET_OK on success, #GNUNET_SYSERR on error */ int GNUNET_STRINGS_fancy_time_to_relative (const char *fancy_time, struct GNUNET_TIME_Relative *rtime) { static const struct ConversionTable table[] = { { "us", 1}, { "ms", 1000 }, { "s", 1000 * 1000LL }, { "\"", 1000 * 1000LL }, { "m", 60 * 1000 * 1000LL}, { "min", 60 * 1000 * 1000LL}, { "minute", 60 * 1000 * 1000LL}, { "minutes", 60 * 1000 * 1000LL}, { "'", 60 * 1000 * 1000LL}, { "h", 60 * 60 * 1000 * 1000LL}, { "hour", 60 * 60 * 1000 * 1000LL}, { "hours", 60 * 60 * 1000 * 1000LL}, { "d", 24 * 60 * 60 * 1000LL * 1000LL}, { "day", 24 * 60 * 60 * 1000LL * 1000LL}, { "days", 24 * 60 * 60 * 1000LL * 1000LL}, { "week", 7 * 24 * 60 * 60 * 1000LL * 1000LL}, { "weeks", 7 * 24 * 60 * 60 * 1000LL * 1000LL}, { "year", 31536000000000LL /* year */ }, { "years", 31536000000000LL /* year */ }, { "a", 31536000000000LL /* year */ }, { NULL, 0} }; int ret; unsigned long long val; if (0 == strcasecmp ("forever", fancy_time)) { *rtime = GNUNET_TIME_UNIT_FOREVER_REL; return GNUNET_OK; } ret = convert_with_table (fancy_time, table, &val); rtime->rel_value_us = (uint64_t) val; return ret; } /** * 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 (i.e. %Y-%m-%d %H:%M:%S) * @param atime set to the absolute time * @return #GNUNET_OK on success, #GNUNET_SYSERR on error */ int GNUNET_STRINGS_fancy_time_to_absolute (const char *fancy_time, struct GNUNET_TIME_Absolute *atime) { struct tm tv; time_t t; if (0 == strcasecmp ("end of time", fancy_time)) { *atime = GNUNET_TIME_UNIT_FOREVER_ABS; return GNUNET_OK; } memset (&tv, 0, sizeof (tv)); if ( (NULL == strptime (fancy_time, "%a %b %d %H:%M:%S %Y", &tv)) && (NULL == strptime (fancy_time, "%c", &tv)) && (NULL == strptime (fancy_time, "%Ec", &tv)) && (NULL == strptime (fancy_time, "%Y-%m-%d %H:%M:%S", &tv)) && (NULL == strptime (fancy_time, "%Y-%m-%d %H:%M", &tv)) && (NULL == strptime (fancy_time, "%x", &tv)) && (NULL == strptime (fancy_time, "%Ex", &tv)) && (NULL == strptime (fancy_time, "%Y-%m-%d", &tv)) && (NULL == strptime (fancy_time, "%Y-%m", &tv)) && (NULL == strptime (fancy_time, "%Y", &tv)) ) return GNUNET_SYSERR; t = mktime (&tv); atime->abs_value_us = (uint64_t) ((uint64_t) t * 1000LL * 1000LL); return GNUNET_OK; } /** * 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 orignal * string is returned. */ char * GNUNET_STRINGS_conv (const char *input, size_t len, const char *input_charset, const char *output_charset) { char *ret; uint8_t *u8_string; char *encoded_string; size_t u8_string_length; size_t encoded_string_length; u8_string = u8_conv_from_encoding (input_charset, iconveh_error, input, len, NULL, NULL, &u8_string_length); if (NULL == u8_string) { LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING, "u8_conv_from_encoding"); goto fail; } if (0 == strcmp (output_charset, "UTF-8")) { ret = GNUNET_malloc (u8_string_length + 1); GNUNET_memcpy (ret, u8_string, u8_string_length); ret[u8_string_length] = '\0'; free (u8_string); return ret; } encoded_string = u8_conv_to_encoding (output_charset, iconveh_error, u8_string, u8_string_length, NULL, NULL, &encoded_string_length); free (u8_string); if (NULL == encoded_string) { LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING, "u8_conv_to_encoding"); goto fail; } ret = GNUNET_malloc (encoded_string_length + 1); GNUNET_memcpy (ret, encoded_string, encoded_string_length); ret[encoded_string_length] = '\0'; free (encoded_string); return ret; fail: LOG (GNUNET_ERROR_TYPE_WARNING, _("Character sets requested were `%s'->`%s'\n"), "UTF-8", output_charset); ret = GNUNET_malloc (len + 1); GNUNET_memcpy (ret, input, len); ret[len] = '\0'; return ret; } /** * 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), * if conversion fails, a copy of the orignal * string is returned. */ char * GNUNET_STRINGS_to_utf8 (const char *input, size_t len, const char *charset) { return GNUNET_STRINGS_conv (input, len, charset, "UTF-8"); } /** * 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 orignal * string is returned. */ char * GNUNET_STRINGS_from_utf8 (const char *input, size_t len, const char *charset) { return GNUNET_STRINGS_conv (input, len, "UTF-8", charset); } /** * Convert the utf-8 input string to lowercase. * Output needs to be allocated appropriately. * * @param input input string * @param output output buffer */ void GNUNET_STRINGS_utf8_tolower (const char *input, char *output) { uint8_t *tmp_in; size_t len; tmp_in = u8_tolower ((uint8_t*)input, strlen ((char *) input), NULL, UNINORM_NFD, NULL, &len); GNUNET_memcpy(output, tmp_in, len); output[len] = '\0'; free(tmp_in); } /** * Convert the utf-8 input string to uppercase. * Output needs to be allocated appropriately. * * @param input input string * @param output output buffer */ void GNUNET_STRINGS_utf8_toupper(const char *input, char *output) { uint8_t *tmp_in; size_t len; tmp_in = u8_toupper ((uint8_t*)input, strlen ((char *) input), NULL, UNINORM_NFD, NULL, &len); GNUNET_memcpy (output, tmp_in, len); output[len] = '\0'; free (tmp_in); } /** * Complete filename (a la shell) from abbrevition. * @param fil the name of the file, may contain ~/ or * be relative to the current directory * @returns the full file name, * NULL is returned on error */ char * GNUNET_STRINGS_filename_expand (const char *fil) { char *buffer; #ifndef MINGW size_t len; char *fm; const char *fil_ptr; #else char *fn; long lRet; #endif if (fil == NULL) return NULL; #ifndef MINGW if (fil[0] == DIR_SEPARATOR) /* absolute path, just copy */ return GNUNET_strdup (fil); if (fil[0] == '~') { fm = getenv ("HOME"); if (fm == NULL) { LOG (GNUNET_ERROR_TYPE_WARNING, _("Failed to expand `$HOME': environment variable `HOME' not set")); return NULL; } fm = GNUNET_strdup (fm); /* do not copy '~' */ fil_ptr = fil + 1; /* skip over dir seperator to be consistent */ if (fil_ptr[0] == DIR_SEPARATOR) fil_ptr++; } else { /* relative path */ fil_ptr = fil; len = 512; fm = NULL; while (1) { buffer = GNUNET_malloc (len); if (getcwd (buffer, len) != NULL) { fm = buffer; break; } if ((errno == ERANGE) && (len < 1024 * 1024 * 4)) { len *= 2; GNUNET_free (buffer); continue; } GNUNET_free (buffer); break; } if (fm == NULL) { LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING, "getcwd"); buffer = getenv ("PWD"); /* alternative */ if (buffer != NULL) fm = GNUNET_strdup (buffer); } if (fm == NULL) fm = GNUNET_strdup ("./"); /* give up */ } GNUNET_asprintf (&buffer, "%s%s%s", fm, (fm[strlen (fm) - 1] == DIR_SEPARATOR) ? "" : DIR_SEPARATOR_STR, fil_ptr); GNUNET_free (fm); return buffer; #else fn = GNUNET_malloc (MAX_PATH + 1); if ((lRet = plibc_conv_to_win_path (fil, fn)) != ERROR_SUCCESS) { SetErrnoFromWinError (lRet); LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING, "plibc_conv_to_win_path"); return NULL; } /* is the path relative? */ if ( (0 != strncmp (fn + 1, ":\\", 2)) && (0 != strncmp (fn, "\\\\", 2)) ) { char szCurDir[MAX_PATH + 1]; lRet = GetCurrentDirectory (MAX_PATH + 1, szCurDir); if (lRet + strlen (fn) + 1 > (MAX_PATH + 1)) { SetErrnoFromWinError (ERROR_BUFFER_OVERFLOW); LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING, "GetCurrentDirectory"); return NULL; } GNUNET_asprintf (&buffer, "%s\\%s", szCurDir, fn); GNUNET_free (fn); fn = buffer; } return fn; #endif } /** * 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 time as human-readable string */ const char * GNUNET_STRINGS_relative_time_to_string (struct GNUNET_TIME_Relative delta, int do_round) { static char buf[128]; const char *unit = _( /* time unit */ "µs"); uint64_t dval = delta.rel_value_us; if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us == delta.rel_value_us) return _("forever"); if (0 == delta.rel_value_us) return _("0 ms"); if ( ( (GNUNET_YES == do_round) && (dval > 5 * 1000) ) || (0 == (dval % 1000) )) { dval = dval / 1000; unit = _( /* time unit */ "ms"); if ( ( (GNUNET_YES == do_round) && (dval > 5 * 1000) ) || (0 == (dval % 1000) )) { dval = dval / 1000; unit = _( /* time unit */ "s"); if ( ( (GNUNET_YES == do_round) && (dval > 5 * 60) ) || (0 == (dval % 60) ) ) { dval = dval / 60; unit = _( /* time unit */ "m"); if ( ( (GNUNET_YES == do_round) && (dval > 5 * 60) ) || (0 == (dval % 60) )) { dval = dval / 60; unit = _( /* time unit */ "h"); if ( ( (GNUNET_YES == do_round) && (dval > 5 * 24) ) || (0 == (dval % 24)) ) { dval = dval / 24; if (1 == dval) unit = _( /* time unit */ "day"); else unit = _( /* time unit */ "days"); } } } } } GNUNET_snprintf (buf, sizeof (buf), "%llu %s", dval, unit); return buf; } /** * "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) { static char buf[255]; time_t tt; struct tm *tp; if (t.abs_value_us == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us) return _("end of time"); tt = t.abs_value_us / 1000LL / 1000LL; tp = localtime (&tt); /* This is hacky, but i don't know a way to detect libc character encoding. * Just expect utf8 from glibc these days. * As for msvcrt, use the wide variant, which always returns utf16 * (otherwise we'd have to detect current codepage or use W32API character * set conversion routines to convert to UTF8). */ #ifndef WINDOWS strftime (buf, sizeof (buf), "%a %b %d %H:%M:%S %Y", tp); #else { static wchar_t wbuf[255]; uint8_t *conved; size_t ssize; wcsftime (wbuf, sizeof (wbuf) / sizeof (wchar_t), L"%a %b %d %H:%M:%S %Y", tp); ssize = sizeof (buf); conved = u16_to_u8 (wbuf, sizeof (wbuf) / sizeof (wchar_t), (uint8_t *) buf, &ssize); if (conved != (uint8_t *) buf) { strncpy (buf, (char *) conved, sizeof (buf)); buf[255 - 1] = '\0'; free (conved); } } #endif return buf; } /** * "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) { const char *short_fn = filename; const char *ss; while (NULL != (ss = strstr (short_fn, DIR_SEPARATOR_STR)) && (ss[1] != '\0')) short_fn = 1 + ss; return short_fn; } /** * Get the decoded value corresponding to a character according to Crockford * Base32 encoding. * * @param a a character * @return corresponding numeric value */ static unsigned int getValue__ (unsigned char a) { unsigned int dec; switch (a) { case 'O': case 'o': a = '0'; break; case 'i': case 'I': case 'l': case 'L': a = '1'; break; /* also consider U to be V */ case 'u': case 'U': a = 'V'; break; default: break; } if ((a >= '0') && (a <= '9')) return a - '0'; if ((a >= 'a') && (a <= 'z')) a = toupper (a); /* return (a - 'a' + 10); */ dec = 0; if ((a >= 'A') && (a <= 'Z')) { if ('I' < a) dec++; if ('L' < a) dec++; if ('O' < a) dec++; if ('U' < a) dec++; return (a - 'A' + 10 - dec); } return -1; } /** * Convert binary data to ASCII encoding using Crockford Base32 encoding. * Returns a pointer to the byte after the last byte in the string, that * is where the 0-terminator was placed if there was room. * * @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 + 4) / 5 bytes * @return pointer to the next byte in @a out or NULL on error. */ char * GNUNET_STRINGS_data_to_string (const void *data, size_t size, char *out, size_t out_size) { /** * 32 characters for encoding */ static char *encTable__ = "0123456789ABCDEFGHJKMNPQRSTVWXYZ"; unsigned int wpos; unsigned int rpos; unsigned int bits; unsigned int vbit; const unsigned char *udata; udata = data; if (out_size < (size * 8 + 4) / 5) { GNUNET_break (0); return NULL; } vbit = 0; wpos = 0; rpos = 0; bits = 0; while ((rpos < size) || (vbit > 0)) { if ((rpos < size) && (vbit < 5)) { bits = (bits << 8) | udata[rpos++]; /* eat 8 more bits */ vbit += 8; } if (vbit < 5) { bits <<= (5 - vbit); /* zero-padding */ GNUNET_assert (vbit == ((size * 8) % 5)); vbit = 5; } if (wpos >= out_size) { GNUNET_break (0); return NULL; } out[wpos++] = encTable__[(bits >> (vbit - 5)) & 31]; vbit -= 5; } GNUNET_assert (0 == vbit); if (wpos < out_size) out[wpos] = '\0'; return &out[wpos]; } /** * Return the base32crockford encoding of the given buffer. * * The returned string will be freshly allocated, and must be free'd * with GNUNET_free(). * * @param buffer with data * @param size size of the buffer * @return freshly allocated, null-terminated string */ char * GNUNET_STRINGS_data_to_string_alloc (const void *buf, size_t size) { char *str_buf; size_t len = size * 8; char *end; if (len % 5 > 0) len += 5 - len % 5; len /= 5; str_buf = GNUNET_malloc (len + 1); end = GNUNET_STRINGS_data_to_string (buf, size, str_buf, len); if (NULL == end) { GNUNET_free (str_buf); return NULL; } *end = '\0'; return str_buf; } /** * Convert Crockford Base32hex 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 */ int GNUNET_STRINGS_string_to_data (const char *enc, size_t enclen, void *out, size_t out_size) { unsigned int rpos; unsigned int wpos; unsigned int bits; unsigned int vbit; int ret; int shift; unsigned char *uout; unsigned int encoded_len = out_size * 8; if (0 == enclen) { if (0 == out_size) return GNUNET_OK; return GNUNET_SYSERR; } uout = out; wpos = out_size; rpos = enclen; if ((encoded_len % 5) > 0) { vbit = encoded_len % 5; /* padding! */ shift = 5 - vbit; bits = (ret = getValue__ (enc[--rpos])) >> shift; } else { vbit = 5; shift = 0; bits = (ret = getValue__ (enc[--rpos])); } if ((encoded_len + shift) / 5 != enclen) return GNUNET_SYSERR; if (-1 == ret) return GNUNET_SYSERR; while (wpos > 0) { if (0 == rpos) { GNUNET_break (0); return GNUNET_SYSERR; } bits = ((ret = getValue__ (enc[--rpos])) << vbit) | bits; if (-1 == ret) return GNUNET_SYSERR; vbit += 5; if (vbit >= 8) { uout[--wpos] = (unsigned char) bits; bits >>= 8; vbit -= 8; } } if ( (0 != rpos) || (0 != vbit) ) return GNUNET_SYSERR; return GNUNET_OK; } /** * Parse a path that might be an URI. * * @param path path to parse. Must be NULL-terminated. * @param scheme_part a pointer to 'char *' where a 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 '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). */ int GNUNET_STRINGS_parse_uri (const char *path, char **scheme_part, const char **path_part) { size_t len; size_t i; int end; int pp_state = 0; const char *post_scheme_part = NULL; len = strlen (path); for (end = 0, i = 0; !end && i < len; i++) { switch (pp_state) { case 0: if ( (path[i] == ':') && (i > 0) ) { pp_state += 1; continue; } if (!((path[i] >= 'A' && path[i] <= 'Z') || (path[i] >= 'a' && path[i] <= 'z') || (path[i] >= '0' && path[i] <= '9') || path[i] == '+' || path[i] == '-' || (path[i] == '.'))) end = 1; break; case 1: case 2: if (path[i] == '/') { pp_state += 1; continue; } end = 1; break; case 3: post_scheme_part = &path[i]; end = 1; break; default: end = 1; } } if (post_scheme_part == NULL) return GNUNET_NO; if (scheme_part) { *scheme_part = GNUNET_malloc (post_scheme_part - path + 1); GNUNET_memcpy (*scheme_part, path, post_scheme_part - path); (*scheme_part)[post_scheme_part - path] = '\0'; } if (path_part) *path_part = post_scheme_part; return GNUNET_YES; } /** * Check whether @a 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 @a filename * is URI and to #GNUNET_NO otherwise. Can be NULL. If @a 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 @a filename is absolute, #GNUNET_NO otherwise. */ int GNUNET_STRINGS_path_is_absolute (const char *filename, int can_be_uri, int *r_is_uri, char **r_uri_scheme) { #if WINDOWS size_t len; #endif const char *post_scheme_path; int is_uri; char * uri; /* consider POSIX paths to be absolute too, even on W32, * as plibc expansion will fix them for us. */ if (filename[0] == '/') return GNUNET_YES; if (can_be_uri) { is_uri = GNUNET_STRINGS_parse_uri (filename, &uri, &post_scheme_path); if (r_is_uri) *r_is_uri = is_uri; if (is_uri) { if (r_uri_scheme) *r_uri_scheme = uri; else GNUNET_free_non_null (uri); #if WINDOWS len = strlen(post_scheme_path); /* Special check for file:///c:/blah * We want to parse 'c:/', not '/c:/' */ if (post_scheme_path[0] == '/' && len >= 3 && post_scheme_path[2] == ':') post_scheme_path = &post_scheme_path[1]; #endif return GNUNET_STRINGS_path_is_absolute (post_scheme_path, GNUNET_NO, NULL, NULL); } } else { if (r_is_uri) *r_is_uri = GNUNET_NO; } #if WINDOWS len = strlen (filename); if (len >= 3 && ((filename[0] >= 'A' && filename[0] <= 'Z') || (filename[0] >= 'a' && filename[0] <= 'z')) && filename[1] == ':' && (filename[2] == '/' || filename[2] == '\\')) return GNUNET_YES; #endif return GNUNET_NO; } #if MINGW #define _IFMT 0170000 /* type of file */ #define _IFLNK 0120000 /* symbolic link */ #define S_ISLNK(m) (((m)&_IFMT) == _IFLNK) #endif /** * Perform @a checks on @a filename. * * @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 */ int GNUNET_STRINGS_check_filename (const char *filename, enum GNUNET_STRINGS_FilenameCheck checks) { struct stat st; if ( (NULL == filename) || (filename[0] == '\0') ) return GNUNET_SYSERR; if (0 != (checks & GNUNET_STRINGS_CHECK_IS_ABSOLUTE)) if (!GNUNET_STRINGS_path_is_absolute (filename, GNUNET_NO, NULL, NULL)) return GNUNET_NO; if (0 != (checks & (GNUNET_STRINGS_CHECK_EXISTS | GNUNET_STRINGS_CHECK_IS_DIRECTORY | GNUNET_STRINGS_CHECK_IS_LINK))) { if (0 != STAT (filename, &st)) { if (0 != (checks & GNUNET_STRINGS_CHECK_EXISTS)) return GNUNET_NO; else return GNUNET_SYSERR; } } if (0 != (checks & GNUNET_STRINGS_CHECK_IS_DIRECTORY)) if (!S_ISDIR (st.st_mode)) return GNUNET_NO; if (0 != (checks & GNUNET_STRINGS_CHECK_IS_LINK)) if (!S_ISLNK (st.st_mode)) return GNUNET_NO; return GNUNET_YES; } /** * 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 @a 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 succeded. * #GNUNET_SYSERR otherwise, in which * case the contents of @a r_buf are undefined. */ int GNUNET_STRINGS_to_address_ipv6 (const char *zt_addr, uint16_t addrlen, struct sockaddr_in6 *r_buf) { char zbuf[addrlen + 1]; int ret; char *port_colon; unsigned int port; if (addrlen < 6) return GNUNET_SYSERR; GNUNET_memcpy (zbuf, zt_addr, addrlen); if ('[' != zbuf[0]) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("IPv6 address did not start with `['\n")); return GNUNET_SYSERR; } zbuf[addrlen] = '\0'; port_colon = strrchr (zbuf, ':'); if (NULL == port_colon) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("IPv6 address did contain ':' to separate port number\n")); return GNUNET_SYSERR; } if (']' != *(port_colon - 1)) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("IPv6 address did contain ']' before ':' to separate port number\n")); return GNUNET_SYSERR; } ret = SSCANF (port_colon, ":%u", &port); if ( (1 != ret) || (port > 65535) ) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("IPv6 address did contain a valid port number after the last ':'\n")); return GNUNET_SYSERR; } *(port_colon-1) = '\0'; memset (r_buf, 0, sizeof (struct sockaddr_in6)); ret = inet_pton (AF_INET6, &zbuf[1], &r_buf->sin6_addr); if (ret <= 0) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Invalid IPv6 address `%s': %s\n"), &zbuf[1], STRERROR (errno)); return GNUNET_SYSERR; } r_buf->sin6_port = htons (port); r_buf->sin6_family = AF_INET6; #if HAVE_SOCKADDR_IN_SIN_LEN r_buf->sin6_len = (u_char) sizeof (struct sockaddr_in6); #endif return GNUNET_OK; } /** * Tries to convert '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 @a zt_addr (not counting 0-terminator). * @param r_buf a buffer to fill. * @return #GNUNET_OK if conversion succeded. * #GNUNET_SYSERR otherwise, in which case * the contents of @a r_buf are undefined. */ int GNUNET_STRINGS_to_address_ipv4 (const char *zt_addr, uint16_t addrlen, struct sockaddr_in *r_buf) { unsigned int temps[4]; unsigned int port; unsigned int cnt; if (addrlen < 9) return GNUNET_SYSERR; cnt = SSCANF (zt_addr, "%u.%u.%u.%u:%u", &temps[0], &temps[1], &temps[2], &temps[3], &port); if (5 != cnt) return GNUNET_SYSERR; for (cnt = 0; cnt < 4; cnt++) if (temps[cnt] > 0xFF) return GNUNET_SYSERR; if (port > 65535) return GNUNET_SYSERR; r_buf->sin_family = AF_INET; r_buf->sin_port = htons (port); r_buf->sin_addr.s_addr = htonl ((temps[0] << 24) + (temps[1] << 16) + (temps[2] << 8) + temps[3]); #if HAVE_SOCKADDR_IN_SIN_LEN r_buf->sin_len = (u_char) sizeof (struct sockaddr_in); #endif return GNUNET_OK; } /** * 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 succeded. #GNUNET_SYSERR otherwise, in which * case the contents of @a r_buf are undefined. */ int GNUNET_STRINGS_to_address_ip (const char *addr, uint16_t addrlen, struct sockaddr_storage *r_buf) { if (addr[0] == '[') return GNUNET_STRINGS_to_address_ipv6 (addr, addrlen, (struct sockaddr_in6 *) r_buf); return GNUNET_STRINGS_to_address_ipv4 (addr, 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 (i.e. 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) { char *cp = GNUNET_strdup (addr); *af = AF_UNSPEC; if ('[' == *addr) { /* IPv6 */ *sa = GNUNET_malloc (sizeof (struct sockaddr_in6)); if (GNUNET_OK != GNUNET_STRINGS_to_address_ipv6 (cp, strlen (cp), (struct sockaddr_in6 *) *sa)) { GNUNET_free (*sa); *sa = NULL; GNUNET_free (cp); return 0; } *af = AF_INET6; GNUNET_free (cp); return sizeof (struct sockaddr_in6); } else { /* IPv4 */ *sa = GNUNET_malloc (sizeof (struct sockaddr_in)); if (GNUNET_OK != GNUNET_STRINGS_to_address_ipv4 (cp, strlen (cp), (struct sockaddr_in *) *sa)) { GNUNET_free (*sa); *sa = NULL; GNUNET_free (cp); return 0; } *af = AF_INET; GNUNET_free (cp); return sizeof (struct sockaddr_in); } } /** * Makes a copy of argv that consists of a single memory chunk that can be * freed with a single call to GNUNET_free(); */ static char *const * _make_continuous_arg_copy (int argc, char *const *argv) { size_t argvsize = 0; int i; char **new_argv; char *p; for (i = 0; i < argc; i++) argvsize += strlen (argv[i]) + 1 + sizeof (char *); new_argv = GNUNET_malloc (argvsize + sizeof (char *)); p = (char *) &new_argv[argc + 1]; for (i = 0; i < argc; i++) { new_argv[i] = p; strcpy (p, argv[i]); p += strlen (argv[i]) + 1; } new_argv[argc] = NULL; return (char *const *) new_argv; } /** * Returns utf-8 encoded arguments. * Does nothing (returns a copy of argc and argv) on any platform * other than W32. * Returned argv has u8argv[u8argc] == NULL. * Returned 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 */ int GNUNET_STRINGS_get_utf8_args (int argc, char *const *argv, int *u8argc, char *const **u8argv) { #if WINDOWS wchar_t *wcmd; wchar_t **wargv; int wargc; int i; char **split_u8argv; wcmd = GetCommandLineW (); if (NULL == wcmd) return GNUNET_SYSERR; wargv = CommandLineToArgvW (wcmd, &wargc); if (NULL == wargv) return GNUNET_SYSERR; split_u8argv = GNUNET_malloc (argc * sizeof (char *)); for (i = 0; i < wargc; i++) { size_t strl; /* Hopefully it will allocate us NUL-terminated strings... */ split_u8argv[i] = (char *) u16_to_u8 (wargv[i], wcslen (wargv[i]) + 1, NULL, &strl); if (NULL == split_u8argv[i]) { int j; for (j = 0; j < i; j++) free (split_u8argv[j]); GNUNET_free (split_u8argv); LocalFree (wargv); return GNUNET_SYSERR; } } *u8argv = _make_continuous_arg_copy (wargc, split_u8argv); *u8argc = wargc; for (i = 0; i < wargc; i++) free (split_u8argv[i]); free (split_u8argv); return GNUNET_OK; #else char *const *new_argv = (char *const *) _make_continuous_arg_copy (argc, argv); *u8argv = new_argv; *u8argc = argc; return GNUNET_OK; #endif } /** * Parse the given port policy. The format is * "[!]SPORT[-DPORT]". * * @param port_policy string to parse * @param pp policy to fill in * @return #GNUNET_OK on success, #GNUNET_SYSERR if the * @a port_policy is malformed */ static int parse_port_policy (const char *port_policy, struct GNUNET_STRINGS_PortPolicy *pp) { const char *pos; int s; int e; char eol[2]; pos = port_policy; if ('!' == *pos) { pp->negate_portrange = GNUNET_YES; pos++; } if (2 == sscanf (pos, "%u-%u%1s", &s, &e, eol)) { if ( (0 == s) || (s > 0xFFFF) || (e < s) || (e > 0xFFFF) ) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Port not in range\n")); return GNUNET_SYSERR; } pp->start_port = (uint16_t) s; pp->end_port = (uint16_t) e; return GNUNET_OK; } if (1 == sscanf (pos, "%u%1s", &s, eol)) { if ( (0 == s) || (s > 0xFFFF) ) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Port not in range\n")); return GNUNET_SYSERR; } pp->start_port = (uint16_t) s; pp->end_port = (uint16_t) s; return GNUNET_OK; } GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Malformed port policy `%s'\n"), port_policy); return GNUNET_SYSERR; } /** * Parse an IPv4 network policy. The argument specifies a list of * subnets. The format is * (network[/netmask][:SPORT[-DPORT]];)* (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) { unsigned int count; unsigned int i; unsigned int j; unsigned int len; int cnt; unsigned int pos; unsigned int temps[8]; int slash; struct GNUNET_STRINGS_IPv4NetworkPolicy *result; int colon; int end; char *routeList; if (NULL == routeListX) return NULL; len = strlen (routeListX); if (0 == len) return NULL; routeList = GNUNET_strdup (routeListX); count = 0; for (i = 0; i < len; i++) if (routeList[i] == ';') count++; result = GNUNET_malloc (sizeof (struct GNUNET_STRINGS_IPv4NetworkPolicy) * (count + 1)); i = 0; pos = 0; while (i < count) { for (colon = pos; ':' != routeList[colon]; colon++) if ( (';' == routeList[colon]) || ('\0' == routeList[colon]) ) break; for (end = colon; ';' != routeList[end]; end++) if ('\0' == routeList[end]) break; if ('\0' == routeList[end]) break; routeList[end] = '\0'; if (':' == routeList[colon]) { routeList[colon] = '\0'; if (GNUNET_OK != parse_port_policy (&routeList[colon + 1], &result[i].pp)) break; } cnt = SSCANF (&routeList[pos], "%u.%u.%u.%u/%u.%u.%u.%u", &temps[0], &temps[1], &temps[2], &temps[3], &temps[4], &temps[5], &temps[6], &temps[7]); if (8 == cnt) { for (j = 0; j < 8; j++) if (temps[j] > 0xFF) { LOG (GNUNET_ERROR_TYPE_WARNING, _("Invalid format for IP: `%s'\n"), &routeList[pos]); GNUNET_free (result); GNUNET_free (routeList); return NULL; } result[i].network.s_addr = htonl ((temps[0] << 24) + (temps[1] << 16) + (temps[2] << 8) + temps[3]); result[i].netmask.s_addr = htonl ((temps[4] << 24) + (temps[5] << 16) + (temps[6] << 8) + temps[7]); pos = end + 1; i++; continue; } /* try second notation */ cnt = SSCANF (&routeList[pos], "%u.%u.%u.%u/%u", &temps[0], &temps[1], &temps[2], &temps[3], &slash); if (5 == cnt) { for (j = 0; j < 4; j++) if (temps[j] > 0xFF) { LOG (GNUNET_ERROR_TYPE_WARNING, _("Invalid format for IP: `%s'\n"), &routeList[pos]); GNUNET_free (result); GNUNET_free (routeList); return NULL; } result[i].network.s_addr = htonl ((temps[0] << 24) + (temps[1] << 16) + (temps[2] << 8) + temps[3]); if ((slash <= 32) && (slash >= 0)) { result[i].netmask.s_addr = 0; while (slash > 0) { result[i].netmask.s_addr = (result[i].netmask.s_addr >> 1) + 0x80000000; slash--; } result[i].netmask.s_addr = htonl (result[i].netmask.s_addr); pos = end + 1; i++; continue; } else { LOG (GNUNET_ERROR_TYPE_WARNING, _("Invalid network notation ('/%d' is not legal in IPv4 CIDR)."), slash); GNUNET_free (result); GNUNET_free (routeList); return NULL; /* error */ } } /* try third notation */ slash = 32; cnt = SSCANF (&routeList[pos], "%u.%u.%u.%u", &temps[0], &temps[1], &temps[2], &temps[3]); if (4 == cnt) { for (j = 0; j < 4; j++) if (temps[j] > 0xFF) { LOG (GNUNET_ERROR_TYPE_WARNING, _("Invalid format for IP: `%s'\n"), &routeList[pos]); GNUNET_free (result); GNUNET_free (routeList); return NULL; } result[i].network.s_addr = htonl ((temps[0] << 24) + (temps[1] << 16) + (temps[2] << 8) + temps[3]); result[i].netmask.s_addr = 0; while (slash > 0) { result[i].netmask.s_addr = (result[i].netmask.s_addr >> 1) + 0x80000000; slash--; } result[i].netmask.s_addr = htonl (result[i].netmask.s_addr); pos = end + 1; i++; continue; } LOG (GNUNET_ERROR_TYPE_WARNING, _("Invalid format for IP: `%s'\n"), &routeList[pos]); GNUNET_free (result); GNUNET_free (routeList); return NULL; /* error */ } if (pos < strlen (routeList)) { LOG (GNUNET_ERROR_TYPE_WARNING, _("Invalid format: `%s'\n"), &routeListX[pos]); GNUNET_free (result); GNUNET_free (routeList); return NULL; /* oops */ } GNUNET_free (routeList); return result; /* ok */ } /** * Parse an IPv6 network policy. The argument specifies a list of * subnets. The format is (network[/netmask[:SPORT[-DPORT]]];)* * (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) { unsigned int count; unsigned int i; unsigned int len; unsigned int pos; int start; int slash; int ret; char *routeList; struct GNUNET_STRINGS_IPv6NetworkPolicy *result; unsigned int bits; unsigned int off; int save; int colon; if (NULL == routeListX) return NULL; len = strlen (routeListX); if (0 == len) return NULL; routeList = GNUNET_strdup (routeListX); count = 0; for (i = 0; i < len; i++) if (';' == routeList[i]) count++; if (';' != routeList[len - 1]) { LOG (GNUNET_ERROR_TYPE_WARNING, _("Invalid network notation (does not end with ';': `%s')\n"), routeList); GNUNET_free (routeList); return NULL; } result = GNUNET_malloc (sizeof (struct GNUNET_STRINGS_IPv6NetworkPolicy) * (count + 1)); i = 0; pos = 0; while (i < count) { start = pos; while (';' != routeList[pos]) pos++; slash = pos; while ((slash >= start) && (routeList[slash] != '/')) slash--; if (slash < start) { memset (&result[i].netmask, 0xFF, sizeof (struct in6_addr)); slash = pos; } else { routeList[pos] = '\0'; for (colon = pos; ':' != routeList[colon]; colon--) if ('/' == routeList[colon]) break; if (':' == routeList[colon]) { routeList[colon] = '\0'; if (GNUNET_OK != parse_port_policy (&routeList[colon + 1], &result[i].pp)) { GNUNET_free (result); GNUNET_free (routeList); return NULL; } } ret = inet_pton (AF_INET6, &routeList[slash + 1], &result[i].netmask); if (ret <= 0) { save = errno; if ((1 != SSCANF (&routeList[slash + 1], "%u", &bits)) || (bits > 128)) { if (0 == ret) LOG (GNUNET_ERROR_TYPE_WARNING, _("Wrong format `%s' for netmask\n"), &routeList[slash + 1]); else { errno = save; LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING, "inet_pton"); } GNUNET_free (result); GNUNET_free (routeList); return NULL; } off = 0; while (bits > 8) { result[i].netmask.s6_addr[off++] = 0xFF; bits -= 8; } while (bits > 0) { result[i].netmask.s6_addr[off] = (result[i].netmask.s6_addr[off] >> 1) + 0x80; bits--; } } } routeList[slash] = '\0'; ret = inet_pton (AF_INET6, &routeList[start], &result[i].network); if (ret <= 0) { if (0 == ret) LOG (GNUNET_ERROR_TYPE_WARNING, _("Wrong format `%s' for network\n"), &routeList[slash + 1]); else LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "inet_pton"); GNUNET_free (result); GNUNET_free (routeList); return NULL; } pos++; i++; } GNUNET_free (routeList); return result; } /** ******************** Base64 encoding ***********/ #define FILLCHAR '=' static char *cvt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz" "0123456789+/"; /** * 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 char *data, size_t len, char **output) { size_t i; char c; size_t ret; char *opt; ret = 0; opt = GNUNET_malloc (2 + (len * 4 / 3) + 8); *output = opt; for (i = 0; i < len; ++i) { c = (data[i] >> 2) & 0x3f; opt[ret++] = cvt[(int) c]; c = (data[i] << 4) & 0x3f; if (++i < len) c |= (data[i] >> 4) & 0x0f; opt[ret++] = cvt[(int) c]; if (i < len) { c = (data[i] << 2) & 0x3f; if (++i < len) c |= (data[i] >> 6) & 0x03; opt[ret++] = cvt[(int) c]; } else { ++i; opt[ret++] = FILLCHAR; } if (i < len) { c = data[i] & 0x3f; opt[ret++] = cvt[(int) c]; } else { opt[ret++] = FILLCHAR; } } opt[ret++] = FILLCHAR; return ret; } #define cvtfind(a)( (((a) >= 'A')&&((a) <= 'Z'))? (a)-'A'\ :(((a)>='a')&&((a)<='z')) ? (a)-'a'+26\ :(((a)>='0')&&((a)<='9')) ? (a)-'0'+52\ :((a) == '+') ? 62\ :((a) == '/') ? 63 : -1) /** * Decode from 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_decode (const char *data, size_t len, char **output) { size_t i; char c; char c1; size_t ret = 0; #define CHECK_CRLF while (data[i] == '\r' || data[i] == '\n') {\ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK, "ignoring CR/LF\n"); \ i++; \ if (i >= len) goto END; \ } *output = GNUNET_malloc ((len * 3 / 4) + 8); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "base64_decode decoding len=%d\n", (int) len); for (i = 0; i < len; ++i) { CHECK_CRLF; if (FILLCHAR == data[i]) break; c = (char) cvtfind (data[i]); ++i; CHECK_CRLF; c1 = (char) cvtfind (data[i]); c = (c << 2) | ((c1 >> 4) & 0x3); (*output)[ret++] = c; if (++i < len) { CHECK_CRLF; c = data[i]; if (FILLCHAR == c) break; c = (char) cvtfind (c); c1 = ((c1 << 4) & 0xf0) | ((c >> 2) & 0xf); (*output)[ret++] = c1; } if (++i < len) { CHECK_CRLF; c1 = data[i]; if (FILLCHAR == c1) break; c1 = (char) cvtfind (c1); c = ((c << 6) & 0xc0) | c1; (*output)[ret++] = c; } } END: return ret; } /* end of strings.c */