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// autoshare-2k8.cpp : watch for new folders in specified path and create shares with default permissions
//

#include "stdafx.h"
#include <windows.h>
#include <Lm.h>
#include <Aclapi.h>

void MakeDirShared(TCHAR *dir);
void DeleteShare(TCHAR *dir);

TCHAR pathprefix[MAX_PATH];

int _tmain(int argc, _TCHAR* argv[])
{
        BYTE buf[4096];
        DWORD buff_len=0;
        DWORD outSize = sizeof(buf);

        if(argc < 2)
        {
                wprintf(_T("Usage: autoshare <path>\n"));
                return -1;
        }

        wsprintf(pathprefix, _T("%s"), argv[1]);

        HANDLE hDir = CreateFile(pathprefix, FILE_LIST_DIRECTORY, FILE_SHARE_READ | FILE_SHARE_WRITE , NULL,    OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
        if(hDir == INVALID_HANDLE_VALUE)
        {
                wprintf(_T("Error can't open path!\n"));
                return -1;
        }

        while(true)
        {
        if(ReadDirectoryChangesW(hDir, &buf, outSize, FALSE, FILE_NOTIFY_CHANGE_DIR_NAME, &buff_len, NULL, NULL) != 0)
        {
                PFILE_NOTIFY_INFORMATION fni = (FILE_NOTIFY_INFORMATION*)&buf;
                DWORD offset=0;
                do
                {
                        TCHAR filename[MAX_PATH];
                        offset=fni->NextEntryOffset;
                        lstrcpynW(filename, fni->FileName, fni->FileNameLength/sizeof(WCHAR)+1);
                        wprintf(_T("dir: %s\nAction: %d\nNext offset: %d\n"), filename, fni->Action, offset);
                        switch(fni->Action)
                        {
                        case FILE_ACTION_RENAMED_NEW_NAME:
                        case FILE_ACTION_ADDED:
                                MakeDirShared(filename);
                                break;
                        case FILE_ACTION_RENAMED_OLD_NAME:
                        case FILE_ACTION_REMOVED:
                                DeleteShare(filename);
                                break;
                        }
                        fni = (PFILE_NOTIFY_INFORMATION)((LPBYTE)buf + fni->NextEntryOffset);
                }
                while(offset != 0L);
        }
        }

        CloseHandle(hDir);

        return 0;
}


void MakeDirShared(TCHAR *dir)
{

    DWORD dwRes;
    PSID pEveryoneSID = NULL;
    PACL pACL = NULL;
    PSECURITY_DESCRIPTOR pSD = NULL;
    EXPLICIT_ACCESS ea[1];
    SID_IDENTIFIER_AUTHORITY SIDAuthWorld = SECURITY_WORLD_SID_AUTHORITY;

    if(!AllocateAndInitializeSid(&SIDAuthWorld, 1, SECURITY_WORLD_RID, 0, 0, 0, 0, 0, 0, 0, &pEveryoneSID))
    {
        wprintf(_T("AllocateAndInitializeSid Error %u\n"), GetLastError());
        goto Cleanup;
    }

    ZeroMemory(&ea, 1 * sizeof(EXPLICIT_ACCESS));
    ea[0].grfAccessPermissions = GENERIC_ALL;
    ea[0].grfAccessMode = SET_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;

    dwRes = SetEntriesInAcl(1, ea, NULL, &pACL);
    if (ERROR_SUCCESS != dwRes)
    {
        wprintf(_T("SetEntriesInAcl Error %u\n"), GetLastError());
        goto Cleanup;
    }

    pSD = (PSECURITY_DESCRIPTOR) LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);
    if (NULL == pSD)
    {
        wprintf(_T("LocalAlloc Error %u\n"), GetLastError());
        goto Cleanup;
    }

    if (!InitializeSecurityDescriptor(pSD, SECURITY_DESCRIPTOR_REVISION))
    {
        wprintf(_T("InitializeSecurityDescriptor Error %u\n"), GetLastError());
        goto Cleanup;
    }

    if (!SetSecurityDescriptorDacl(pSD, TRUE, pACL, FALSE))
    {
        wprintf(_T("SetSecurityDescriptorDacl Error %u\n"), GetLastError());
        goto Cleanup;
    }

        SHARE_INFO_502 info;
        TCHAR fullpath[MAX_PATH];
        TCHAR sharename[MAX_PATH];

        wsprintf(fullpath, _T("%s\\%s"), pathprefix, dir);
        wsprintf(sharename, _T("%s$"), dir);

        info.shi502_netname = sharename;
        info.shi502_type = STYPE_DISKTREE;
        info.shi502_remark = (LPTSTR)L"";
        info.shi502_permissions = ACCESS_ALL;
        info.shi502_max_uses = -1;
        info.shi502_current_uses = 0;
        info.shi502_path = fullpath;
        info.shi502_passwd = (LPTSTR)L"";
        info.shi502_reserved = 0;
        info.shi502_security_descriptor = pSD;
        DWORD parm_err;
        dwRes=NetShareAdd(NULL, 502, (LPBYTE) &info, &parm_err);
        if(dwRes==0)
                wprintf(_T("Share created.\n"));
        else
                wprintf(_T("NetShareAdd() error: %u\tparmerr=%u\n"), dwRes, parm_err);


Cleanup:
    if (pEveryoneSID)
        FreeSid(pEveryoneSID);
    if (pACL)
        LocalFree(pACL);
    if (pSD)
        LocalFree(pSD);

    return;

}

void DeleteShare(TCHAR *dir)
{
        NET_API_STATUS res;
        TCHAR sharename[MAX_PATH];

        wprintf(_T("%s\n"), dir);
        wsprintf(sharename, _T("%s$"), dir);
        res=NetShareDel(NULL, sharename, 0);
        if(res==0)
                wprintf(_T("Share Removed.\n"));
        else
                wprintf(_T("NetShareDel() error: %u\n"), res);
        return;
}