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utils.c
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utils.c
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/* -*- c-basic-offset: 8 -*-
rdesktop: A Remote Desktop Protocol client.
Generic utility functions
Copyright 2013-2017 Henrik Andersson <[email protected]> for Cendio AB
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <errno.h>
#include <iconv.h>
#include "rdesktop.h"
#include "utils.h"
extern char g_codepage[16];
static RD_BOOL g_iconv_works = True;
uint32
utils_djb2_hash(const char *str)
{
uint8 c;
uint8 *pstr;
uint32 hash = 5381;
pstr = (uint8*)str;
while ((c = *pstr++))
{
hash = ((hash << 5) + hash) + c;
}
return hash;
}
char *
utils_string_escape(const char *str)
{
const char *p;
char *pe, *e, esc[4];
size_t es;
int cnt;
/* count indices */
cnt = 0;
p = str;
while (*(p++) != '\0')
if ((unsigned char) *p < 32 || *p == '%')
cnt++;
/* if no characters needs escaping return copy of str */
if (cnt == 0)
return strdup(str);
/* allocate new mem for result */
es = strlen(str) + (cnt * 3) + 1;
pe = e = xmalloc(es);
memset(e, 0, es);
p = str;
while (*p != '\0')
{
if ((unsigned char) *p < 32 || *p == '%')
{
snprintf(esc, 4, "%%%02X", *p);
memcpy(pe, esc, 3);
pe += 3;
}
else
{
*pe = *p;
pe++;
}
p++;
}
return e;
}
char *
utils_string_unescape(const char *str)
{
char *ns, *ps, *pd;
unsigned char c;
ns = xmalloc(strlen(str) + 1);
memcpy(ns, str, strlen(str) + 1);
ps = pd = ns;
while (*ps != '\0')
{
/* check if found escaped character */
if (ps[0] == '%')
{
if (sscanf(ps, "%%%2hhX", &c) == 1)
{
pd[0] = (char)c;
ps += 3;
pd++;
continue;
}
}
/* just copy over the char */
*pd = *ps;
ps++;
pd++;
}
pd[0] = '\0';
return ns;
}
int
utils_mkdir_safe(const char *path, int mask)
{
int res = 0;
struct stat st;
res = stat(path, &st);
if (res == -1)
return mkdir(path, mask);
if (!S_ISDIR(st.st_mode))
{
errno = EEXIST;
return -1;
}
return 0;
}
int
utils_mkdir_p(const char *path, int mask)
{
int res;
char *ptok;
char pt[PATH_MAX];
char bp[PATH_MAX];
if (!path || strlen(path) == 0)
{
errno = EINVAL;
return -1;
}
if (strlen(path) > PATH_MAX)
{
errno = E2BIG;
return -1;
}
res = 0;
pt[0] = bp[0] = '\0';
strcpy(bp, path);
ptok = strtok(bp, "/");
if (ptok == NULL)
return utils_mkdir_safe(path, mask);
do
{
if (ptok != bp)
strcat(pt, "/");
strcat(pt, ptok);
res = utils_mkdir_safe(pt, mask);
if (res != 0)
return res;
}
while ((ptok = strtok(NULL, "/")) != NULL);
return 0;
}
/* Convert from system locale string to UTF-8 */
int
utils_locale_to_utf8(const char *src, size_t is, char *dest, size_t os)
{
static iconv_t *iconv_h = (iconv_t) - 1;
if (strncmp(g_codepage, "UTF-8", strlen("UTF-8")) == 0)
goto pass_trough_as_is;
if (g_iconv_works == False)
goto pass_trough_as_is;
/* if not already initialize */
if (iconv_h == (iconv_t) - 1)
{
if ((iconv_h = iconv_open("UTF-8", g_codepage)) == (iconv_t) - 1)
{
logger(Core, Warning,
"utils_string_to_utf8(), iconv_open[%s -> %s] fail %p", g_codepage,
"UTF-8", iconv_h);
g_iconv_works = False;
goto pass_trough_as_is;
}
}
/* convert string */
if (iconv(iconv_h, (char **) &src, &is, &dest, &os) == (size_t) - 1)
{
iconv_close(iconv_h);
iconv_h = (iconv_t) - 1;
logger(Core, Warning, "utils_string_to_utf8, iconv(1) fail, errno %d", errno);
g_iconv_works = False;
goto pass_trough_as_is;
}
/* Out couldn't hold the entire conversion */
if (is != 0)
return -1;
pass_trough_as_is:
/* can dest hold strcpy of src */
if (os < (strlen(src) + 1))
return -1;
memcpy(dest, src, strlen(src) + 1);
return 0;
}
void
utils_calculate_dpi_scale_factors(uint32 width, uint32 height, uint32 dpi,
uint32 *physwidth, uint32 *physheight,
uint32 *desktopscale, uint32 *devicescale)
{
*physwidth = *physheight = *desktopscale = *devicescale = 0;
if (dpi > 0)
{
*physwidth = width * 254 / (dpi * 10);
*physheight = height * 254 / (dpi * 10);
/* the spec calls this out as being valid for range
100-500 but I doubt the upper range is accurate */
*desktopscale = dpi < 96 ? 100 : (dpi * 100 + 48) / 96;
/* the only allowed values for device scale factor are
100, 140, and 180. */
*devicescale = dpi < 134 ? 100 : (dpi < 173 ? 140 : 180);
}
}
void
utils_apply_session_size_limitations(uint32 *width, uint32 *height)
{
/* width MUST be even number */
*width -= (*width) % 2;
if (*width > 8192)
*width = 8192;
else if (*width < 200)
*width = 200;
if (*height > 8192)
*height = 8192;
else if (*height < 200)
*height = 200;
}
/*
* component logging
*
*/
#include <stdarg.h>
static char *level[] = {
"debug",
"verbose", /* Verbose message for end user, no prefixed lines */
"warning",
"error",
"notice" /* Normal messages for end user, no prefixed lines */
};
static char *subject[] = {
"UI",
"Keyboard",
"Clipboard",
"Sound",
"Protocol",
"Graphics",
"Core",
"SmartCard",
"Disk"
};
static log_level_t _logger_level = Warning;
#define DEFAULT_LOGGER_SUBJECTS (1 << Core)
#define ALL_LOGGER_SUBJECTS \
(1 << GUI) \
| (1 << Keyboard) \
| (1 << Clipboard) \
| (1 << Sound) \
| (1 << Protocol) \
| (1 << Graphics) \
| (1 << Core) \
| (1 << SmartCard) \
| (1 << Disk)
static int _logger_subjects = DEFAULT_LOGGER_SUBJECTS;
void
logger(log_subject_t s, log_level_t lvl, char *format, ...)
{
va_list ap;
char buf[1024];
// Do not log if message is below global log level
if (_logger_level > lvl)
return;
// Skip debug logging for non specified subjects
if (lvl < Verbose && !(_logger_subjects & (1 << s)))
return;
va_start(ap, format);
vsnprintf(buf, sizeof(buf), format, ap);
// Notice and Verbose messages goes without prefix
if (lvl == Notice || lvl == Verbose)
fprintf(stdout, "%s\n", buf);
else
fprintf(stderr, "%s(%s): %s\n", subject[s], level[lvl], buf);
fflush(stdout);
va_end(ap);
}
void
logger_set_verbose(int verbose)
{
if (_logger_level < Verbose)
return;
if (verbose)
_logger_level = Verbose;
else
_logger_level = Warning;
}
void
logger_set_subjects(char *subjects)
{
int clear;
int bit;
char *pcs;
char *token;
if (!subjects || !strlen(subjects))
return;
pcs = strdup(subjects);
token = strtok(pcs, ",");
if (token == NULL)
{
free(pcs);
return;
}
_logger_subjects = 0;
do
{
if (token == NULL)
break;
bit = 0;
clear = (token[0] == '-') ? 1 : 0;
if (clear == 1)
token++;
if (strcmp(token, "All") == 0)
_logger_subjects |= ALL_LOGGER_SUBJECTS;
else if (strcmp(token, "UI") == 0)
bit = (1 << GUI);
else if (strcmp(token, "Keyboard") == 0)
bit = (1 << Keyboard);
else if (strcmp(token, "Clipboard") == 0)
bit = (1 << Clipboard);
else if (strcmp(token, "Sound") == 0)
bit = (1 << Sound);
else if (strcmp(token, "Protocol") == 0)
bit = (1 << Protocol);
else if (strcmp(token, "Graphics") == 0)
bit = (1 << Graphics);
else if (strcmp(token, "Core") == 0)
bit = (1 << Core);
else if (strcmp(token, "SmartCard") == 0)
bit = (1 << SmartCard);
else if (strcmp(token, "Disk") == 0)
bit = (1 << Disk);
else
continue;
// set or clear logger subject bit
if (clear)
_logger_subjects &= ~bit;
else
_logger_subjects |= bit;
}
while ((token = strtok(NULL, ",")) != NULL);
_logger_level = Debug;
free(pcs);
}