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xrdp/common/string_calls.c
Kentaro Hayashi 69ea406440 Add g_str_to_bitmask utility function 
It should be used for comma separated configuration to bitmask.

e.g. RestrictOutboundClipboard = text, file, image
2022-01-14 10:17:02 +09:00

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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2020
*
* Licensed 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.
*
* generic string handling calls
*/
#if defined(HAVE_CONFIG_H)
#include "config_ac.h"
#endif
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <ctype.h>
#include "log.h"
#include "os_calls.h"
#include "string_calls.h"
#include "defines.h"
unsigned int
g_format_info_string(char *dest, unsigned int len,
const char *format,
const struct info_string_tag map[])
{
unsigned int result = 0;
const char *copy_from; /* Data to add to output */
unsigned int copy_len; /* Length of above */
unsigned int skip; /* Date to skip over in format string */
const char *p;
const struct info_string_tag *m;
for ( ; *format != '\0'; format += skip)
{
if (*format == '%')
{
char ch = *(format + 1);
if (ch == '%')
{
/* '%%' in format - replace with single '%' */
copy_from = format;
copy_len = 1;
skip = 2;
}
else if (ch == '\0')
{
/* Percent at end of string - ignore */
copy_from = NULL;
copy_len = 0;
skip = 1;
}
else
{
/* Look up the character in the map, assuming failure */
copy_from = NULL;
copy_len = 0;
skip = 2;
for (m = map ; m->ch != '\0' ; ++m)
{
if (ch == m->ch)
{
copy_from = m->val;
copy_len = strlen(copy_from);
break;
}
}
}
}
else if ((p = strchr(format, '%')) != NULL)
{
/* Copy up to the next '%' */
copy_from = format;
copy_len = p - format;
skip = copy_len;
}
else
{
/* Copy the rest of the format string */
copy_from = format;
copy_len = strlen(format);
skip = copy_len;
}
/* Update the result before any truncation */
result += copy_len;
/* Do we have room in the output buffer for any more data? We
* must always write a terminator if possible */
if (len > 1)
{
if (copy_len > (len - 1))
{
copy_len = len - 1;
}
memcpy(dest, copy_from, copy_len);
dest += copy_len;
len -= copy_len;
}
}
/* Room for a terminator? */
if (len > 0)
{
*dest = '\0';
}
return result;
}
/******************************************************************************/
const char *
g_bool2text(int value)
{
return value ? "true" : "false";
}
/*****************************************************************************/
int
g_text2bool(const char *s)
{
if ( (g_atoi(s) != 0) ||
(0 == g_strcasecmp(s, "true")) ||
(0 == g_strcasecmp(s, "on")) ||
(0 == g_strcasecmp(s, "yes")))
{
return 1;
}
return 0;
}
/*****************************************************************************/
int
g_get_display_num_from_display(const char *display_text)
{
int rv = -1;
const char *p;
/* Skip over the hostname part of the DISPLAY */
if (display_text != NULL && (p = strchr(display_text, ':')) != NULL)
{
++p; /* Skip the ':' */
/* Cater for the (still supported) double-colon. See
* https://www.x.org/releases/X11R7.7/doc/libX11/libX11/libX11.html */
if (*p == ':')
{
++p;
}
/* Check it starts with a digit, to avoid oddities like DISPLAY=":zz.0"
* being parsed successfully */
if (isdigit(*p))
{
rv = g_atoi(p);
}
}
return rv;
}
/*****************************************************************************/
/* returns length of text */
int
g_strlen(const char *text)
{
if (text == NULL)
{
return 0;
}
return strlen(text);
}
/*****************************************************************************/
/* locates char in text */
char *
g_strchr(const char *text, int c)
{
if (text == NULL)
{
return 0;
}
/* Cast needed to compile with C++ */
return (char *)strchr(text, c);
}
/*****************************************************************************/
/* locates char in text */
char *
g_strrchr(const char *text, int c)
{
if (text == NULL)
{
return 0;
}
/* Cast needed to compile with C++ */
return (char *)strrchr(text, c);
}
/*****************************************************************************/
/* locates char in text with length */
char *
g_strnchr(const char *text, int c, int len)
{
if (text == NULL || len <= 0)
{
return NULL;
}
return (char *)memchr(text, c, len);
}
/*****************************************************************************/
/* returns dest */
char *
g_strcpy(char *dest, const char *src)
{
if (src == 0 && dest != 0)
{
dest[0] = 0;
return dest;
}
if (dest == 0 || src == 0)
{
return 0;
}
return strcpy(dest, src);
}
/*****************************************************************************/
/* returns dest */
char *
g_strncpy(char *dest, const char *src, int len)
{
char *rv;
if (src == 0 && dest != 0)
{
dest[0] = 0;
return dest;
}
if (dest == 0 || src == 0)
{
return 0;
}
rv = strncpy(dest, src, len);
dest[len] = 0;
return rv;
}
/*****************************************************************************/
/* returns dest */
char *
g_strcat(char *dest, const char *src)
{
if (dest == 0 || src == 0)
{
return dest;
}
return strcat(dest, src);
}
/*****************************************************************************/
/* returns dest */
char *
g_strncat(char *dest, const char *src, int len)
{
if (dest == 0 || src == 0)
{
return dest;
}
return strncat(dest, src, len);
}
/*****************************************************************************/
/* if in = 0, return 0 else return newly alloced copy of in */
char *
g_strdup(const char *in)
{
int len;
char *p;
if (in == 0)
{
return 0;
}
len = g_strlen(in);
p = (char *)g_malloc(len + 1, 0);
if (p != NULL)
{
g_strcpy(p, in);
}
return p;
}
/*****************************************************************************/
/* if in = 0, return 0 else return newly alloced copy of input string
* if the input string is larger than maxlen the returned string will be
* truncated. All strings returned will include null termination*/
char *
g_strndup(const char *in, const unsigned int maxlen)
{
unsigned int len;
char *p;
if (in == 0)
{
return 0;
}
len = g_strlen(in);
if (len > maxlen)
{
len = maxlen - 1;
}
p = (char *)g_malloc(len + 2, 0);
if (p != NULL)
{
g_strncpy(p, in, len + 1);
}
return p;
}
/*****************************************************************************/
int
g_strcmp(const char *c1, const char *c2)
{
return strcmp(c1, c2);
}
/*****************************************************************************/
int
g_strncmp(const char *c1, const char *c2, int len)
{
return strncmp(c1, c2, len);
}
/*****************************************************************************/
/* compare up to delim */
int
g_strncmp_d(const char *s1, const char *s2, const char delim, int n)
{
char c1;
char c2;
c1 = 0;
c2 = 0;
while (n > 0)
{
c1 = *(s1++);
c2 = *(s2++);
if ((c1 == 0) || (c1 != c2) || (c1 == delim) || (c2 == delim))
{
return c1 - c2;
}
n--;
}
return c1 - c2;
}
/*****************************************************************************/
int
g_strcasecmp(const char *c1, const char *c2)
{
#if defined(_WIN32)
return stricmp(c1, c2);
#else
return strcasecmp(c1, c2);
#endif
}
/*****************************************************************************/
int
g_strncasecmp(const char *c1, const char *c2, int len)
{
#if defined(_WIN32)
return strnicmp(c1, c2, len);
#else
return strncasecmp(c1, c2, len);
#endif
}
/*****************************************************************************/
int
g_atoi(const char *str)
{
if (str == 0)
{
return 0;
}
return atoi(str);
}
/*****************************************************************************/
/* As g_atoi() but allows for hexadecimal too */
int
g_atoix(const char *str)
{
int base = 10;
if (str == NULL)
{
str = "0";
}
while (isspace(*str))
{
++str;
}
if (*str == '0' && tolower(*(str + 1)) == 'x')
{
str += 2;
base = 16;
}
return strtol(str, NULL, base);
}
/*****************************************************************************/
int
g_htoi(char *str)
{
int len;
int index;
int rv;
int val;
int shift;
rv = 0;
len = strlen(str);
index = len - 1;
shift = 0;
while (index >= 0)
{
val = 0;
switch (str[index])
{
case '1':
val = 1;
break;
case '2':
val = 2;
break;
case '3':
val = 3;
break;
case '4':
val = 4;
break;
case '5':
val = 5;
break;
case '6':
val = 6;
break;
case '7':
val = 7;
break;
case '8':
val = 8;
break;
case '9':
val = 9;
break;
case 'a':
case 'A':
val = 10;
break;
case 'b':
case 'B':
val = 11;
break;
case 'c':
case 'C':
val = 12;
break;
case 'd':
case 'D':
val = 13;
break;
case 'e':
case 'E':
val = 14;
break;
case 'f':
case 'F':
val = 15;
break;
}
rv = rv | (val << shift);
index--;
shift += 4;
}
return rv;
}
/*****************************************************************************/
/* returns number of bytes copied into out_str */
int
g_bytes_to_hexstr(const void *bytes, int num_bytes, char *out_str,
int bytes_out_str)
{
int rv;
int index;
char *lout_str;
const tui8 *lbytes;
rv = 0;
lbytes = (const tui8 *) bytes;
lout_str = out_str;
for (index = 0; index < num_bytes; index++)
{
if (bytes_out_str < 3)
{
break;
}
g_snprintf(lout_str, bytes_out_str, "%2.2x", lbytes[index]);
lout_str += 2;
bytes_out_str -= 2;
rv += 2;
}
return rv;
}
/*****************************************************************************/
/* convert a byte array into a hex dump */
char *
g_bytes_to_hexdump(const char *src, int len)
{
unsigned char *line;
int i;
int dump_number_lines;
int dump_line_length;
int dump_length;
int dump_offset;
int thisline;
int offset;
char *dump_buffer;
#define HEX_DUMP_SOURCE_BYTES_PER_LINE (16)
#ifdef _WIN32
#define HEX_DUMP_NEWLINE_SIZE (2)
#else
#ifdef _MACOS
#define HEX_DUMP_NEWLINE_SIZE (1)
#else
#define HEX_DUMP_NEWLINE_SIZE (1)
#endif
#endif
dump_line_length = (4 + 3 /* = 4 offset + 3 space */
+ ((2 + 1) * HEX_DUMP_SOURCE_BYTES_PER_LINE) /* + (2 hex char + 1 space) per source byte */
+ 2 /* + 2 space */
+ HEX_DUMP_SOURCE_BYTES_PER_LINE
+ HEX_DUMP_NEWLINE_SIZE);
dump_number_lines = (len / HEX_DUMP_SOURCE_BYTES_PER_LINE) + 1; /* +1 to round up */
dump_length = (dump_number_lines * dump_line_length /* hex dump lines */
+ 1); /* terminating NULL */
dump_buffer = (char *)g_malloc(dump_length, 1);
if (dump_buffer == NULL)
{
LOG_DEVEL(LOG_LEVEL_WARNING,
"Failed to allocate buffer for hex dump of size %d",
dump_length);
return NULL;
}
line = (unsigned char *)src;
offset = 0;
dump_offset = 0;
while (offset < len)
{
g_sprintf(dump_buffer + dump_offset, "%04x ", offset);
dump_offset += 7;
thisline = len - offset;
if (thisline > HEX_DUMP_SOURCE_BYTES_PER_LINE)
{
thisline = HEX_DUMP_SOURCE_BYTES_PER_LINE;
}
for (i = 0; i < thisline; i++)
{
g_sprintf(dump_buffer + dump_offset, "%02x ", line[i]);
dump_offset += 3;
}
for (; i < HEX_DUMP_SOURCE_BYTES_PER_LINE; i++)
{
dump_buffer[dump_offset++] = ' ';
dump_buffer[dump_offset++] = ' ';
dump_buffer[dump_offset++] = ' ';
}
dump_buffer[dump_offset++] = ' ';
dump_buffer[dump_offset++] = ' ';
for (i = 0; i < thisline; i++)
{
dump_buffer[dump_offset++] = (line[i] >= 0x20 && line[i] < 0x7f) ? line[i] : '.';
}
for (; i < HEX_DUMP_SOURCE_BYTES_PER_LINE; i++)
{
dump_buffer[dump_offset++] = ' ';
}
#ifdef _WIN32
dump_buffer[dump_offset++] = '\r';
dump_buffer[dump_offset++] = '\n';
#else
#ifdef _MACOS
dump_buffer[dump_offset++] = '\r';
#else
dump_buffer[dump_offset++] = '\n';
#endif
#endif
offset += thisline;
line += thisline;
if (dump_offset % dump_line_length != 0)
{
LOG_DEVEL(LOG_LEVEL_WARNING,
"BUG: dump_offset (%d) at the end of a line is not a "
"multiple of the line length (%d)",
dump_offset, dump_line_length);
}
}
if (dump_offset > dump_length)
{
LOG_DEVEL(LOG_LEVEL_WARNING,
"BUG: dump_offset (%d) is larger than the dump_buffer length (%d)",
dump_offset, dump_length);
dump_buffer[0] = '\0';
return dump_buffer;
}
/* replace the last new line with the end of the string since log_message
will add a new line */
dump_buffer[dump_offset - HEX_DUMP_NEWLINE_SIZE] = '\0';
return dump_buffer;
}
/*****************************************************************************/
int
g_pos(const char *str, const char *to_find)
{
const char *pp;
pp = strstr(str, to_find);
if (pp == 0)
{
return -1;
}
return (pp - str);
}
/*****************************************************************************/
char *
g_strstr(const char *haystack, const char *needle)
{
if (haystack == NULL || needle == NULL)
{
return NULL;
}
/* Cast needed to compile with C++ */
return (char *)strstr(haystack, needle);
}
/*****************************************************************************/
int
g_mbstowcs(twchar *dest, const char *src, int n)
{
wchar_t *ldest;
int rv;
ldest = (wchar_t *)dest;
rv = mbstowcs(ldest, src, n);
return rv;
}
/*****************************************************************************/
int
g_wcstombs(char *dest, const twchar *src, int n)
{
const wchar_t *lsrc;
int rv;
lsrc = (const wchar_t *)src;
rv = wcstombs(dest, lsrc, n);
return rv;
}
/*****************************************************************************/
/* returns error */
/* trim spaces and tabs, anything <= space */
/* trim_flags 1 trim left, 2 trim right, 3 trim both, 4 trim through */
/* this will always shorten the string or not change it */
int
g_strtrim(char *str, int trim_flags)
{
int index;
int len;
int text1_index;
int got_char;
wchar_t *text;
wchar_t *text1;
len = mbstowcs(0, str, 0);
if (len < 1)
{
return 0;
}
if ((trim_flags < 1) || (trim_flags > 4))
{
return 1;
}
text = (wchar_t *)malloc(len * sizeof(wchar_t) + 8);
text1 = (wchar_t *)malloc(len * sizeof(wchar_t) + 8);
if (text == NULL || text1 == NULL)
{
free(text);
free(text1);
return 1;
}
text1_index = 0;
mbstowcs(text, str, len + 1);
switch (trim_flags)
{
case 4: /* trim through */
for (index = 0; index < len; index++)
{
if (text[index] > 32)
{
text1[text1_index] = text[index];
text1_index++;
}
}
text1[text1_index] = 0;
break;
case 3: /* trim both */
got_char = 0;
for (index = 0; index < len; index++)
{
if (got_char)
{
text1[text1_index] = text[index];
text1_index++;
}
else
{
if (text[index] > 32)
{
text1[text1_index] = text[index];
text1_index++;
got_char = 1;
}
}
}
text1[text1_index] = 0;
len = text1_index;
/* trim right */
for (index = len - 1; index >= 0; index--)
{
if (text1[index] > 32)
{
break;
}
}
text1_index = index + 1;
text1[text1_index] = 0;
break;
case 2: /* trim right */
/* copy it */
for (index = 0; index < len; index++)
{
text1[text1_index] = text[index];
text1_index++;
}
/* trim right */
for (index = len - 1; index >= 0; index--)
{
if (text1[index] > 32)
{
break;
}
}
text1_index = index + 1;
text1[text1_index] = 0;
break;
case 1: /* trim left */
got_char = 0;
for (index = 0; index < len; index++)
{
if (got_char)
{
text1[text1_index] = text[index];
text1_index++;
}
else
{
if (text[index] > 32)
{
text1[text1_index] = text[index];
text1_index++;
got_char = 1;
}
}
}
text1[text1_index] = 0;
break;
}
wcstombs(str, text1, text1_index + 1);
free(text);
free(text1);
return 0;
}
/*****************************************************************************/
char *
g_strnjoin(char *dest, int dest_len, const char *joiner, const char *src[], int src_len)
{
int len = 0;
int joiner_len;
int i = 0;
int dest_remaining;
char *dest_pos = dest;
char *dest_end;
if (dest == NULL || dest_len < 1)
{
return dest;
}
if (src == NULL || src_len < 1)
{
dest[0] = '\0';
return dest;
}
dest[0] = '\0';
dest_end = dest + dest_len - 1;
joiner_len = g_strlen(joiner);
for (i = 0; i < src_len - 1 && dest_pos < dest_end; i++)
{
len = g_strlen(src[i]);
dest_remaining = dest_end - dest_pos;
g_strncat(dest_pos, src[i], dest_remaining);
dest_pos += MIN(len, dest_remaining);
if (dest_pos < dest_end)
{
dest_remaining = dest_end - dest_pos;
g_strncat(dest_pos, joiner, dest_remaining);
dest_pos += MIN(joiner_len, dest_remaining);
}
}
if (i == src_len - 1 && dest_pos < dest_end)
{
g_strncat(dest_pos, src[i], dest_end - dest_pos);
}
return dest;
}
int
g_bitmask_to_str(int bitmask, const struct bitmask_string bitdefs[],
char delim, char *buff, int bufflen)
{
int rlen = 0; /* Returned length */
if (bufflen <= 0) /* Caller error */
{
rlen = -1;
}
else
{
char *p = buff;
/* Find the last writeable character in the buffer */
const char *last = buff + (bufflen - 1);
const struct bitmask_string *b;
for (b = &bitdefs[0] ; b->mask != 0; ++b)
{
if ((bitmask & b->mask) != 0)
{
if (p > buff)
{
/* Not first item - append separator */
if (p < last)
{
*p++ = delim;
}
++rlen;
}
int slen = g_strlen(b->str);
int copylen = MIN(slen, last - p);
g_memcpy(p, b->str, copylen);
p += copylen;
rlen += slen;
/* Remove the bit so we can check for undefined bits later*/
bitmask &= ~b->mask;
}
}
if (bitmask != 0)
{
/* Bits left which aren't named by the user */
if (p > buff)
{
if (p < last)
{
*p++ = delim;
}
++rlen;
}
/* This call will terminate the return buffer */
rlen += g_snprintf(p, last - p + 1, "0x%x", bitmask);
}
else
{
*p = '\0';
}
}
return rlen;
}
int
g_str_to_bitmask(const char *str, const struct bitmask_string bitdefs[],
const char *delim, char *unrecognised, int unrecognised_len)
{
char *properties = NULL;
char *p = NULL;
int mask = 0;
if (unrecognised_len < 1)
{
/* No space left to tell unrecognised tokens */
return 0;
}
if (!unrecognised)
{
return 0;
}
/* ensure not to return with uninitialized buffer */
unrecognised[0] = '\0';
if (!str || !bitdefs || !delim)
{
return 0;
}
properties = g_strdup(str);
if (!properties)
{
return 0;
}
p = strtok(properties, delim);
while (p != NULL)
{
g_strtrim(p, 3);
const struct bitmask_string *b;
int found = 0;
for (b = &bitdefs[0] ; b->str != NULL; ++b)
{
if (0 == g_strcasecmp(p, b->str))
{
mask |= b->mask;
found = 1;
break;
}
}
if (found == 0)
{
int length = g_strlen(unrecognised);
if (length > 0)
{
/* adding ",property" */
if (length + g_strlen(p) + 1 < unrecognised_len)
{
unrecognised[length] = delim[0];
length += 1;
g_strcpy(unrecognised + length, p);
}
}
else if (g_strlen(p) < unrecognised_len)
{
g_strcpy(unrecognised, p);
}
}
p = strtok(NULL, delim);
}
g_free(properties);
return mask;
}
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