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|
/* $Id: RTFtpServer.cpp $ */
/** @file
* IPRT - Utility for running a (simple) FTP server.
*
* Use this setup to best see what's going on:
* VBOX_LOG=rt_ftp=~0
* VBOX_LOG_DEST="nofile stderr"
* VBOX_LOG_FLAGS="unbuffered enabled thread msprog"
*
*/
/*
* Copyright (C) 2020-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* 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, in version 3 of the
* License.
*
* 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 <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <signal.h>
#include <iprt/ftp.h>
#include <iprt/net.h> /* To make use of IPv4Addr in RTGETOPTUNION. */
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/ctype.h>
#include <iprt/err.h>
#include <iprt/file.h>
#include <iprt/getopt.h>
#include <iprt/initterm.h>
#include <iprt/mem.h>
#include <iprt/message.h>
#include <iprt/path.h>
#include <iprt/stream.h>
#include <iprt/string.h>
#include <iprt/thread.h>
#include <iprt/vfs.h>
#ifdef RT_OS_WINDOWS
# include <iprt/win/windows.h>
#endif
/*********************************************************************************************************************************
* Definitations *
*********************************************************************************************************************************/
typedef struct FTPSERVERDATA
{
/** The absolute path of the FTP server's root directory. */
char szPathRootAbs[RTPATH_MAX];
/** The relative current working directory (CWD) to szRootDir. */
char szCWD[RTPATH_MAX];
} FTPSERVERDATA;
typedef FTPSERVERDATA *PFTPSERVERDATA;
/**
* Enumeration specifying the VFS handle type of the FTP server.
*/
typedef enum FTPSERVERVFSHANDLETYPE
{
FTPSERVERVFSHANDLETYPE_INVALID = 0,
FTPSERVERVFSHANDLETYPE_FILE,
FTPSERVERVFSHANDLETYPE_DIR,
/** The usual 32-bit hack. */
FTPSERVERVFSHANDLETYPE_32BIT_HACK = 0x7fffffff
} FTPSERVERVFSHANDLETYPE;
/**
* Structure for keeping a VFS handle of the FTP server.
*/
typedef struct FTPSERVERVFSHANDLE
{
/** The type of the handle, stored in the union below. */
FTPSERVERVFSHANDLETYPE enmType;
union
{
/** The VFS (chain) handle to use for this file. */
RTVFSFILE hVfsFile;
/** The VFS (chain) handle to use for this directory. */
RTVFSDIR hVfsDir;
} u;
} FTPSERVERVFSHANDLE;
typedef FTPSERVERVFSHANDLE *PFTPSERVERVFSHANDLE;
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** Set by the signal handler when the FTP server shall be terminated. */
static volatile bool g_fCanceled = false;
static FTPSERVERDATA g_FtpServerData;
#ifdef RT_OS_WINDOWS
static BOOL WINAPI signalHandler(DWORD dwCtrlType) RT_NOTHROW_DEF
{
bool fEventHandled = FALSE;
switch (dwCtrlType)
{
/* User pressed CTRL+C or CTRL+BREAK or an external event was sent
* via GenerateConsoleCtrlEvent(). */
case CTRL_BREAK_EVENT:
case CTRL_CLOSE_EVENT:
case CTRL_C_EVENT:
ASMAtomicWriteBool(&g_fCanceled, true);
fEventHandled = TRUE;
break;
default:
break;
/** @todo Add other events here. */
}
return fEventHandled;
}
#else /* !RT_OS_WINDOWS */
/**
* Signal handler that sets g_fCanceled.
*
* This can be executed on any thread in the process, on Windows it may even be
* a thread dedicated to delivering this signal. Don't do anything
* unnecessary here.
*/
static void signalHandler(int iSignal) RT_NOTHROW_DEF
{
NOREF(iSignal);
ASMAtomicWriteBool(&g_fCanceled, true);
}
#endif
/**
* Installs a custom signal handler to get notified
* whenever the user wants to intercept the program.
*
* @todo Make this handler available for all VBoxManage modules?
*/
static int signalHandlerInstall(void)
{
g_fCanceled = false;
int rc = VINF_SUCCESS;
#ifdef RT_OS_WINDOWS
if (!SetConsoleCtrlHandler((PHANDLER_ROUTINE)signalHandler, TRUE /* Add handler */))
{
rc = RTErrConvertFromWin32(GetLastError());
RTMsgError("Unable to install console control handler, rc=%Rrc\n", rc);
}
#else
signal(SIGINT, signalHandler);
signal(SIGTERM, signalHandler);
# ifdef SIGBREAK
signal(SIGBREAK, signalHandler);
# endif
#endif
return rc;
}
/**
* Uninstalls a previously installed signal handler.
*/
static int signalHandlerUninstall(void)
{
int rc = VINF_SUCCESS;
#ifdef RT_OS_WINDOWS
if (!SetConsoleCtrlHandler((PHANDLER_ROUTINE)NULL, FALSE /* Remove handler */))
{
rc = RTErrConvertFromWin32(GetLastError());
RTMsgError("Unable to uninstall console control handler, rc=%Rrc\n", rc);
}
#else
signal(SIGINT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
# ifdef SIGBREAK
signal(SIGBREAK, SIG_DFL);
# endif
#endif
return rc;
}
static DECLCALLBACK(int) onUserConnect(PRTFTPCALLBACKDATA pData, const char *pcszUser)
{
RT_NOREF(pData, pcszUser);
RTPrintf("User '%s' connected\n", pcszUser);
return VINF_SUCCESS;
}
static DECLCALLBACK(int) onUserAuthenticate(PRTFTPCALLBACKDATA pData, const char *pcszUser, const char *pcszPassword)
{
RT_NOREF(pData, pcszUser, pcszPassword);
RTPrintf("Authenticating user '%s' ...\n", pcszUser);
return VINF_SUCCESS;
}
static DECLCALLBACK(int) onUserDisonnect(PRTFTPCALLBACKDATA pData, const char *pcszUser)
{
RT_NOREF(pData);
RTPrintf("User '%s' disconnected\n", pcszUser);
return VINF_SUCCESS;
}
static DECLCALLBACK(int) onFileOpen(PRTFTPCALLBACKDATA pData, const char *pcszPath, uint32_t fMode, void **ppvHandle)
{
PFTPSERVERDATA pThis = (PFTPSERVERDATA)pData->pvUser;
Assert(pData->cbUser == sizeof(FTPSERVERDATA));
PFTPSERVERVFSHANDLE pHandle = (PFTPSERVERVFSHANDLE)RTMemAllocZ(sizeof(FTPSERVERVFSHANDLE));
if (!pHandle)
return VERR_NO_MEMORY;
char *pszPathAbs = NULL;
if (RTStrAPrintf(&pszPathAbs, "%s/%s", pThis->szPathRootAbs, pcszPath) <= 0)
return VERR_NO_MEMORY;
int rc = RTVfsChainOpenFile(pszPathAbs, fMode, &pHandle->u.hVfsFile, NULL /*poffError */, NULL /* pErrInfo */);
if (RT_SUCCESS(rc))
{
pHandle->enmType = FTPSERVERVFSHANDLETYPE_FILE;
*ppvHandle = pHandle;
}
else
RTMemFree(pHandle);
RTStrFree(pszPathAbs);
return rc;
}
static DECLCALLBACK(int) onFileRead(PRTFTPCALLBACKDATA pData, void *pvHandle, void *pvBuf, size_t cbToRead, size_t *pcbRead)
{
RT_NOREF(pData);
PFTPSERVERVFSHANDLE pHandle = (PFTPSERVERVFSHANDLE)pvHandle;
AssertPtrReturn(pHandle, VERR_INVALID_POINTER);
AssertReturn(pHandle->enmType == FTPSERVERVFSHANDLETYPE_FILE, VERR_INVALID_PARAMETER);
return RTVfsFileRead(pHandle->u.hVfsFile, pvBuf, cbToRead, pcbRead);
}
static DECLCALLBACK(int) onFileClose(PRTFTPCALLBACKDATA pData, void *pvHandle)
{
RT_NOREF(pData);
PFTPSERVERVFSHANDLE pHandle = (PFTPSERVERVFSHANDLE)pvHandle;
AssertPtrReturn(pHandle, VERR_INVALID_POINTER);
AssertReturn(pHandle->enmType == FTPSERVERVFSHANDLETYPE_FILE, VERR_INVALID_PARAMETER);
int rc = RTVfsFileRelease(pHandle->u.hVfsFile);
if (RT_SUCCESS(rc))
{
RTMemFree(pvHandle);
pvHandle = NULL;
}
return rc;
}
static DECLCALLBACK(int) onFileGetSize(PRTFTPCALLBACKDATA pData, const char *pcszPath, uint64_t *puSize)
{
PFTPSERVERDATA pThis = (PFTPSERVERDATA)pData->pvUser;
Assert(pData->cbUser == sizeof(FTPSERVERDATA));
char *pszStat = NULL;
if (RTStrAPrintf(&pszStat, "%s/%s", pThis->szPathRootAbs, pcszPath) <= 0)
return VERR_NO_MEMORY;
RTPrintf("Retrieving file size for '%s' ...\n", pcszPath);
RTFILE hFile;
int rc = RTFileOpen(&hFile, pcszPath,
RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_WRITE);
if (RT_SUCCESS(rc))
{
rc = RTFileQuerySize(hFile, puSize);
if (RT_SUCCESS(rc))
RTPrintf("File size is: %RU64\n", *puSize);
RTFileClose(hFile);
}
RTStrFree(pszStat);
return rc;
}
static DECLCALLBACK(int) onFileStat(PRTFTPCALLBACKDATA pData, const char *pcszPath, PRTFSOBJINFO pFsObjInfo)
{
PFTPSERVERDATA pThis = (PFTPSERVERDATA)pData->pvUser;
Assert(pData->cbUser == sizeof(FTPSERVERDATA));
char *pszStat = NULL;
if (RTStrAPrintf(&pszStat, "%s/%s", pThis->szPathRootAbs, pcszPath) <= 0)
return VERR_NO_MEMORY;
RTPrintf("Stat for '%s'\n", pszStat);
RTFILE hFile;
int rc = RTFileOpen(&hFile, pszStat,
RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_WRITE);
if (RT_SUCCESS(rc))
{
RTFSOBJINFO fsObjInfo;
rc = RTFileQueryInfo(hFile, &fsObjInfo, RTFSOBJATTRADD_NOTHING);
if (RT_SUCCESS(rc))
{
if (pFsObjInfo)
*pFsObjInfo = fsObjInfo;
}
RTFileClose(hFile);
}
RTStrFree(pszStat);
return rc;
}
static DECLCALLBACK(int) onPathSetCurrent(PRTFTPCALLBACKDATA pData, const char *pcszCWD)
{
PFTPSERVERDATA pThis = (PFTPSERVERDATA)pData->pvUser;
Assert(pData->cbUser == sizeof(FTPSERVERDATA));
RTPrintf("Setting current directory to '%s'\n", pcszCWD);
/** @todo BUGBUG Santiy checks! */
return RTStrCopy(pThis->szCWD, sizeof(pThis->szCWD), pcszCWD);
}
static DECLCALLBACK(int) onPathGetCurrent(PRTFTPCALLBACKDATA pData, char *pszPWD, size_t cbPWD)
{
PFTPSERVERDATA pThis = (PFTPSERVERDATA)pData->pvUser;
Assert(pData->cbUser == sizeof(FTPSERVERDATA));
RTPrintf("Current directory is: '%s'\n", pThis->szCWD);
return RTStrCopy(pszPWD, cbPWD, pThis->szCWD);
}
static DECLCALLBACK(int) onPathUp(PRTFTPCALLBACKDATA pData)
{
RT_NOREF(pData);
return VINF_SUCCESS;
}
static DECLCALLBACK(int) onDirOpen(PRTFTPCALLBACKDATA pData, const char *pcszPath, void **ppvHandle)
{
PFTPSERVERDATA pThis = (PFTPSERVERDATA)pData->pvUser;
Assert(pData->cbUser == sizeof(FTPSERVERDATA));
PFTPSERVERVFSHANDLE pHandle = (PFTPSERVERVFSHANDLE)RTMemAllocZ(sizeof(FTPSERVERVFSHANDLE));
if (!pHandle)
return VERR_NO_MEMORY;
/* Construct absolute path. */
char *pszPathAbs = NULL;
if (RTStrAPrintf(&pszPathAbs, "%s/%s", pThis->szPathRootAbs, pcszPath) <= 0)
return VERR_NO_MEMORY;
RTPrintf("Opening directory '%s'\n", pszPathAbs);
int rc = RTVfsChainOpenDir(pszPathAbs, 0 /*fFlags*/, &pHandle->u.hVfsDir, NULL /* poffError */, NULL /* pErrInfo */);
if (RT_SUCCESS(rc))
{
pHandle->enmType = FTPSERVERVFSHANDLETYPE_DIR;
*ppvHandle = pHandle;
}
else
{
RTMemFree(pHandle);
}
RTStrFree(pszPathAbs);
return rc;
}
static DECLCALLBACK(int) onDirClose(PRTFTPCALLBACKDATA pData, void *pvHandle)
{
RT_NOREF(pData);
PFTPSERVERVFSHANDLE pHandle = (PFTPSERVERVFSHANDLE)pvHandle;
AssertPtrReturn(pHandle, VERR_INVALID_POINTER);
AssertReturn(pHandle->enmType == FTPSERVERVFSHANDLETYPE_DIR, VERR_INVALID_PARAMETER);
RTVfsDirRelease(pHandle->u.hVfsDir);
RTMemFree(pHandle);
pHandle = NULL;
return VINF_SUCCESS;
}
static DECLCALLBACK(int) onDirRead(PRTFTPCALLBACKDATA pData, void *pvHandle, char **ppszEntry,
PRTFSOBJINFO pInfo, char **ppszOwner, char **ppszGroup, char **ppszTarget)
{
RT_NOREF(pData);
RT_NOREF(ppszTarget); /* No symlinks yet */
PFTPSERVERVFSHANDLE pHandle = (PFTPSERVERVFSHANDLE)pvHandle;
AssertPtrReturn(pHandle, VERR_INVALID_POINTER);
AssertReturn(pHandle->enmType == FTPSERVERVFSHANDLETYPE_DIR, VERR_INVALID_PARAMETER);
size_t cbDirEntryAlloced = sizeof(RTDIRENTRYEX);
PRTDIRENTRYEX pDirEntry = (PRTDIRENTRYEX)RTMemTmpAlloc(cbDirEntryAlloced);
if (!pDirEntry)
return VERR_NO_MEMORY;
int rc;
for (;;)
{
size_t cbDirEntry = cbDirEntryAlloced;
rc = RTVfsDirReadEx(pHandle->u.hVfsDir, pDirEntry, &cbDirEntry, RTFSOBJATTRADD_UNIX);
if (RT_FAILURE(rc))
{
if (rc == VERR_BUFFER_OVERFLOW)
{
RTMemTmpFree(pDirEntry);
cbDirEntryAlloced = RT_ALIGN_Z(RT_MIN(cbDirEntry, cbDirEntryAlloced) + 64, 64);
pDirEntry = (PRTDIRENTRYEX)RTMemTmpAlloc(cbDirEntryAlloced);
if (pDirEntry)
continue;
}
else if (rc != VERR_NO_MORE_FILES)
break;
}
if (RT_SUCCESS(rc))
{
if (pDirEntry->Info.Attr.u.Unix.uid != NIL_RTUID)
{
RTFSOBJINFO OwnerInfo;
rc = RTVfsDirQueryPathInfo(pHandle->u.hVfsDir,
pDirEntry->szName, &OwnerInfo, RTFSOBJATTRADD_UNIX_OWNER, RTPATH_F_ON_LINK);
if ( RT_SUCCESS(rc)
&& OwnerInfo.Attr.u.UnixOwner.szName[0])
{
*ppszOwner = RTStrDup(&OwnerInfo.Attr.u.UnixOwner.szName[0]);
if (!*ppszOwner)
rc = VERR_NO_MEMORY;
}
}
if ( RT_SUCCESS(rc)
&& pDirEntry->Info.Attr.u.Unix.gid != NIL_RTGID)
{
RTFSOBJINFO GroupInfo;
rc = RTVfsDirQueryPathInfo(pHandle->u.hVfsDir,
pDirEntry->szName, &GroupInfo, RTFSOBJATTRADD_UNIX_GROUP, RTPATH_F_ON_LINK);
if ( RT_SUCCESS(rc)
&& GroupInfo.Attr.u.UnixGroup.szName[0])
{
*ppszGroup = RTStrDup(&GroupInfo.Attr.u.UnixGroup.szName[0]);
if (!*ppszGroup)
rc = VERR_NO_MEMORY;
}
}
}
*ppszEntry = RTStrDup(pDirEntry->szName);
AssertPtrReturn(*ppszEntry, VERR_NO_MEMORY);
*pInfo = pDirEntry->Info;
break;
} /* for */
RTMemTmpFree(pDirEntry);
pDirEntry = NULL;
return rc;
}
int main(int argc, char **argv)
{
int rc = RTR3InitExe(argc, &argv, 0);
if (RT_FAILURE(rc))
return RTMsgInitFailure(rc);
/* Use some sane defaults. */
char szAddress[64] = "localhost";
uint16_t uPort = 2121;
RT_ZERO(g_FtpServerData);
/*
* Parse arguments.
*/
static const RTGETOPTDEF s_aOptions[] =
{
{ "--address", 'a', RTGETOPT_REQ_IPV4ADDR }, /** @todo Use a string for DNS hostnames? */
/** @todo Implement IPv6 support? */
{ "--port", 'p', RTGETOPT_REQ_UINT16 },
{ "--root-dir", 'r', RTGETOPT_REQ_STRING },
{ "--verbose", 'v', RTGETOPT_REQ_NOTHING }
};
RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
unsigned uVerbosityLevel = 1;
RTGETOPTUNION ValueUnion;
RTGETOPTSTATE GetState;
RTGetOptInit(&GetState, argc, argv, s_aOptions, RT_ELEMENTS(s_aOptions), 1, RTGETOPTINIT_FLAGS_OPTS_FIRST);
while ((rc = RTGetOpt(&GetState, &ValueUnion)))
{
switch (rc)
{
case 'a':
RTStrPrintf2(szAddress, sizeof(szAddress), "%RU8.%RU8.%RU8.%RU8", /** @todo Improve this. */
ValueUnion.IPv4Addr.au8[0], ValueUnion.IPv4Addr.au8[1], ValueUnion.IPv4Addr.au8[2], ValueUnion.IPv4Addr.au8[3]);
break;
case 'p':
uPort = ValueUnion.u16;
break;
case 'r':
RTStrCopy(g_FtpServerData.szPathRootAbs, sizeof(g_FtpServerData.szPathRootAbs), ValueUnion.psz);
break;
case 'v':
uVerbosityLevel++;
break;
case 'h':
RTPrintf("Usage: %s [options]\n"
"\n"
"Options:\n"
" -a, --address (default: localhost)\n"
" Specifies the address to use for listening.\n"
" -p, --port (default: 2121)\n"
" Specifies the port to use for listening.\n"
" -r, --root-dir (default: current dir)\n"
" Specifies the root directory being served.\n"
" -v, --verbose\n"
" Controls the verbosity level.\n"
" -h, -?, --help\n"
" Display this help text and exit successfully.\n"
" -V, --version\n"
" Display the revision and exit successfully.\n"
, RTPathFilename(argv[0]));
return RTEXITCODE_SUCCESS;
case 'V':
RTPrintf("$Revision: 153224 $\n");
return RTEXITCODE_SUCCESS;
default:
return RTGetOptPrintError(rc, &ValueUnion);
}
}
if (!strlen(g_FtpServerData.szPathRootAbs))
{
/* By default use the current directory as serving root directory. */
rc = RTPathGetCurrent(g_FtpServerData.szPathRootAbs, sizeof(g_FtpServerData.szPathRootAbs));
if (RT_FAILURE(rc))
return RTMsgErrorExit(RTEXITCODE_FAILURE, "Retrieving current directory failed: %Rrc", rc);
}
/* Initialize CWD. */
RTStrPrintf2(g_FtpServerData.szCWD, sizeof(g_FtpServerData.szCWD), "/");
/* Install signal handler. */
rc = signalHandlerInstall();
if (RT_SUCCESS(rc))
{
/*
* Create the FTP server instance.
*/
RTFTPSERVERCALLBACKS Callbacks;
RT_ZERO(Callbacks);
Callbacks.pfnOnUserConnect = onUserConnect;
Callbacks.pfnOnUserAuthenticate = onUserAuthenticate;
Callbacks.pfnOnUserDisconnect = onUserDisonnect;
Callbacks.pfnOnFileOpen = onFileOpen;
Callbacks.pfnOnFileRead = onFileRead;
Callbacks.pfnOnFileClose = onFileClose;
Callbacks.pfnOnFileGetSize = onFileGetSize;
Callbacks.pfnOnFileStat = onFileStat;
Callbacks.pfnOnPathSetCurrent = onPathSetCurrent;
Callbacks.pfnOnPathGetCurrent = onPathGetCurrent;
Callbacks.pfnOnPathUp = onPathUp;
Callbacks.pfnOnDirOpen = onDirOpen;
Callbacks.pfnOnDirClose = onDirClose;
Callbacks.pfnOnDirRead = onDirRead;
RTFTPSERVER hFTPServer;
rc = RTFtpServerCreate(&hFTPServer, szAddress, uPort, &Callbacks,
&g_FtpServerData, sizeof(g_FtpServerData));
if (RT_SUCCESS(rc))
{
RTPrintf("Starting FTP server at %s:%RU16 ...\n", szAddress, uPort);
RTPrintf("Root directory is '%s'\n", g_FtpServerData.szPathRootAbs);
RTPrintf("Running FTP server ...\n");
for (;;)
{
RTThreadSleep(200);
if (g_fCanceled)
break;
}
RTPrintf("Stopping FTP server ...\n");
int rc2 = RTFtpServerDestroy(hFTPServer);
if (RT_SUCCESS(rc))
rc = rc2;
RTPrintf("Stopped FTP server\n");
}
else
rcExit = RTMsgErrorExit(RTEXITCODE_FAILURE, "RTFTPServerCreate failed: %Rrc", rc);
int rc2 = signalHandlerUninstall();
if (RT_SUCCESS(rc))
rc = rc2;
}
/* Set rcExit on failure in case we forgot to do so before. */
if (RT_FAILURE(rc))
rcExit = RTEXITCODE_FAILURE;
return rcExit;
}
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