How to create text file(log file) having all rights(Read,Write) to all windows users (Everybody) using sprintf in VC++ - visual-c++

Question

I am creating Smart.log file using following code :
void S_SetLogFileName()
{
char HomeDir[MAX_PATH];
if (strlen(LogFileName) == 0)
{
TCHAR AppDataFolderPath[MAX_PATH];
if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_COMMON_APPDATA, NULL, 0, AppDataFolderPath)))
{
sprintf(AppDataFolderPath, "%s\\Netcom\\Logs", AppDataFolderPath);
if (CreateDirectory(AppDataFolderPath, NULL) || ERROR_ALREADY_EXISTS == GetLastError())
sprintf(LogFileName,"%s\\Smart.log",AppDataFolderPath);
else
goto DEFAULTVALUE;
}
else
{
DEFAULTVALUE:
if (S_GetHomeDir(HomeDir,sizeof(HomeDir)))
sprintf(LogFileName,"%s\\Bin\\Smart.log",HomeDir);
else
strcpy(LogFileName,"Smart.log");
}
}
}
and opening and modifying it as follows:
void LogMe(char *FileName,char *s, BOOL PrintTimeStamp)
{
FILE *stream;
char buff[2048] = "";
char date[256];
char time[256];
SYSTEMTIME SystemTime;
if(PrintTimeStamp)
{
GetLocalTime(&SystemTime);
GetDateFormat(LOCALE_USER_DEFAULT,0,&SystemTime,"MM':'dd':'yyyy",date,sizeof(date));
GetTimeFormat(LOCALE_USER_DEFAULT,0,&SystemTime,"HH':'mm':'ss",time,sizeof(time));
sprintf(buff,"[%d - %s %s]", GetCurrentThreadId(),date,time);
}
stream = fopen( FileName, "a" );
fprintf( stream, "%s %s\n", buff, s );
fclose( stream );
}
Here's the problem:
UserA runs the program first, it creates \ProgramData\Netcom\Smart.log using S_SetLogFileName()
UserB runs the program next, it tries to append/ modify to Smart.log and gets access denied.
What should i need to change in my code to allow all users to access Smart.log file ?

Answer 1

This is solution, I am looking for, Hope useful for some one.
refer from :
void SetFilePermission(LPCTSTR FileName)
{
PSID pEveryoneSID = NULL;
PACL pACL = NULL;
EXPLICIT_ACCESS ea[1];
SID_IDENTIFIER_AUTHORITY SIDAuthWorld = SECURITY_WORLD_SID_AUTHORITY;
// Create a well-known SID for the Everyone group.
AllocateAndInitializeSid(&SIDAuthWorld, 1,
SECURITY_WORLD_RID,
0, 0, 0, 0, 0, 0, 0,
&pEveryoneSID);
// Initialize an EXPLICIT_ACCESS structure for an ACE.
ZeroMemory(&ea, 1 * sizeof(EXPLICIT_ACCESS));
ea[0].grfAccessPermissions = 0xFFFFFFFF;
ea[0].grfAccessMode = GRANT_ACCESS;
ea[0].grfInheritance = NO_INHERITANCE;
ea[0].Trustee.TrusteeForm = TRUSTEE_IS_SID;
ea[0].Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
ea[0].Trustee.ptstrName = (LPTSTR)pEveryoneSID;
// Create a new ACL that contains the new ACEs.
SetEntriesInAcl(1, ea, NULL, &pACL);
// Initialize a security descriptor.
PSECURITY_DESCRIPTOR pSD = (PSECURITY_DESCRIPTOR)LocalAlloc(LPTR,
SECURITY_DESCRIPTOR_MIN_LENGTH);
InitializeSecurityDescriptor(pSD, SECURITY_DESCRIPTOR_REVISION);
// Add the ACL to the security descriptor.
SetSecurityDescriptorDacl(pSD,
TRUE, // bDaclPresent flag
pACL,
FALSE); // not a default DACL
//Change the security attributes
SetFileSecurity(FileName, DACL_SECURITY_INFORMATION, pSD);
if (pEveryoneSID)
FreeSid(pEveryoneSID);
if (pACL)
LocalFree(pACL);
if (pSD)
LocalFree(pSD);
}