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Create fopen_wrapper so we can filter out specific directories, which DOS games should have no access to

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@4238
This commit is contained in:
Peter Veenstra 2019-06-24 20:09:59 +00:00
parent 46babe5666
commit e90de61263
2 changed files with 59 additions and 0 deletions
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1
include/cross.h
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@ -105,4 +105,5 @@ bool read_directory_first(dir_information* dirp, char* entry_name, bool& is_dire
bool read_directory_next(dir_information* dirp, char* entry_name, bool& is_directory);
void close_directory(dir_information* dirp);
FILE *fopen_wrap(const char *path, const char *mode);
#endif

58
src/misc/cross.cpp
View file

@ -21,6 +21,7 @@
#include "cross.h"
#include "support.h"
#include <string>
#include <limits.h>
#include <stdlib.h>
#ifdef WIN32
@ -244,3 +245,60 @@ void close_directory(dir_information* dirp) {
}
#endif
FILE *fopen_wrap(const char *path, const char *mode) {
#if defined(WIN32) || defined(OS2)
;
#elif defined (MACOSX)
;
#else
#if defined (HAVE_REALPATH)
char work[CROSS_LEN] = {0};
strncpy(work,path,CROSS_LEN-1);
char* last = strrchr(work,'/');
if (last) {
if (last != work) {
*last = 0;
//If this compare fails, then we are dealing with files in /
//Which is outside the scope, but test anyway.
//However as realpath only works for exising files. The testing is
//in that case not done against new files.
}
char* check = realpath(work,NULL);
if (check) {
if ( ( strlen(check) == 5 && strcmp(check,"/proc") == 0) || strncmp(check,"/proc/",6) == 0) {
// LOG_MSG("lst hit %s blocking!",path);
free(check);
return NULL;
}
free(check);
}
}
#if 0
//Lightweight version, but then existing files can still be read, which is not ideal
if (strpbrk(mode,"aw+") != NULL) {
LOG_MSG("pbrk ok");
char* check = realpath(path,NULL);
//Will be null if file doesn't exist.... ENOENT
//TODO What about unlink /proc/self/mem and then create it ?
//Should be safe for what we want..
if (check) {
if (strncmp(check,"/proc/",6) == 0) {
free(check);
return NULL;
}
free(check);
}
}
*/
#endif //0
#endif //HAVE_REALPATH
#endif
return fopen(path,mode);
}