348 lines
9.6 KiB
C
348 lines
9.6 KiB
C
/**
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* Feathery FTP-Server <https://sourceforge.net/projects/feathery>
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* Copyright (C) 2005-2010 Andreas Martin (andreas.martin@linuxmail.org)
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*
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* ftpSession.c - Session handling of connected clients
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*
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* A ftp session is a TCP connection between the server and a ftp client.
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* Each session has its own unique session id. The session id refers
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* (index in session[]) to a struct ftpSession_S which holds all
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* relevant data. The virtual chroot environment is also part of the
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* session management.
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*
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "ftpTypes.h"
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#include "ftpConfig.h"
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#include "ftp.h"
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/**
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* @brief array that holds the data of all ftp sessions
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*
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* The index represents the session ID.
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*/
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LOCAL ftpSession_S sessions[MAX_CONNECTIONS];
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/**
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* @brief number of active file or directory transmission
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*/
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LOCAL int actTransCnt;
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/**
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* @brief Scratch-buffer for path manipulation
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*/
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LOCAL char pathScratchBuf[MAX_PATH_LEN];
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/**
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* @brief Opens a ftp session
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*
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* Searches in 'sessions' for an empty entry and inits the session data.
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* Call this function after accepting a tcp connection from a ftp client.
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*
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* @param ctrlSocket control socket which initiated the the ftp session
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* @param remoteIp IP address of the client
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* @param remotePort TCP-Port of the client
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*
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* @return session id or -1 if session limit is reached
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*/
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int ftpOpenSession(socket_t ctrlSocket, ip_t remoteIp, port_t remotePort)
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{
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int n;
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for(n = 0; n < MAX_CONNECTIONS; n++)
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{
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if(!sessions[n].open)
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{
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sessions[n].open = TRUE;
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sessions[n].authenticated = FALSE;
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sessions[n].userId = 0;
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sessions[n].workingDir[0] = '\0';
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sessions[n].remoteIp = remoteIp;
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sessions[n].remotePort = remotePort;
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sessions[n].remoteDataPort = 0;
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sessions[n].passive = FALSE;
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sessions[n].binary = TRUE;
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sessions[n].timeLastCmd = ftpGetUnixTime();
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sessions[n].ctrlSocket = ctrlSocket;
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sessions[n].passiveDataSocket = -1;
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sessions[n].rxBufWriteIdx = 0;
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sessions[n].activeTrans.op = OP_NOP;
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sessions[n].activeTrans.fsHandle = NULL;
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sessions[n].activeTrans.dataSocket = -1;
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sessions[n].activeTrans.fileSize = 0;
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return n;
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}
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}
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return -1;
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}
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/**
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* @brief Marks the current ftp session as 'authenticated'
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*
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* @param id Session id
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*
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* @return 0
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*/
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int ftpAuthSession(int id)
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{
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sessions[id].authenticated = TRUE;
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strcpy(sessions[id].workingDir, "/");
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return 0;
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}
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/**
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* @brief Closes a ftp session
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*
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* Closes the TCP control connection and releases the session struct.
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*
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* @param id Session id
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*
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* @return 0
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*/
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int ftpCloseSession(int id)
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{
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if(VERBOSE_MODE_ENABLED) printf("In ftpCloseSession sessionId = %d, remote IP = %u, port = %d\n",
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id, sessions[id].remoteIp, sessions[id].remoteFTPServerPassivePort);
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if(ftpFindExternalFTPServerIp != NULL && ftpFindExternalFTPServerIp(sessions[id].remoteIp) != 0)
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{
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if(ftpRemoveUPNPPortForward)
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{
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if(VERBOSE_MODE_ENABLED) printf("In ftpCmdPasv sessionId = %d, removing UPNP port forward [%d]\n", id,sessions[id].remoteFTPServerPassivePort);
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ftpRemoveUPNPPortForward(sessions[id].remoteFTPServerPassivePort, sessions[id].remoteFTPServerPassivePort);
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sessions[id].remoteFTPServerPassivePort = 0;
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}
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}
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if(sessions[id].open) {
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ftpCloseSocket(sessions[id].ctrlSocket);
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ftpCloseTransmission(id);
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}
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sessions[id].remoteIp = 0;
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sessions[id].ctrlSocket = 0;
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sessions[id].open = FALSE;
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if(VERBOSE_MODE_ENABLED) printf("Session %d closed\n", id);
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return 0;
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}
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/**
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* @brief Returns pointer to session struct
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*
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* @param id Session id
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*
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* @return pointer to session data
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*/
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ftpSession_S* ftpGetSession(int id)
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{
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return &sessions[id];
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}
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/**
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* @brief Normalizes a path string
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*
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* The function resolves all dot and doubledot directory entries in the
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* passed path. If the normalized path refers beyond root, root is returned.
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*
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* @param path string of an absolute path
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*
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* @return 0
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*/
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LOCAL int normalizePath(char* path)
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{
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char *in;
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char *r = NULL;
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r = path;
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in = path;
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while((in = strchr(in, '/')))
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{
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if(!strncmp(in, "/./", 3))
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{
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ftpStrcpy(in, &in[2]);
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continue;
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}
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if(!strcmp(in, "/."))
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{
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in[1] = '\0';
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continue;
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}
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if(!strncmp(in, "/../", 4))
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{
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*in = '\0';
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r = strrchr(path, '/');
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if(r == NULL)
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r = path;
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ftpStrcpy(r, &in[3]);
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in = r;
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continue;
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}
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if(!strcmp(in, "/.."))
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{
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*in = '\0';
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r = strrchr(path, '/');
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if(r)
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{
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if(r == path)
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r[1] = '\0';
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else
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*r = '\0';
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}
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else
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{
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in[0] = '/';
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in[1] = '\0';
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}
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continue;
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}
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in++;
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}
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return 0;
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}
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/**
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* @brief Translate a ftp session path to server path
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*
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* The translated path depends on the current working directory of the
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* session and the root path of the session. In addition the path will
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* be normalized.
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* The server path is generated as followed:
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* passed path is relative => server path = ftp user root + session working dir + path
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* passed path is absolute => server path = ftp user root + path
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*
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* @param id Session id
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* @param path ftp session path (can be relative or absolute)
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* @param if != 0 dot and doubledot directories will be resolved
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*
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* @return translated absolute server path
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*/
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const char* ftpGetRealPath(int id, const char* path, int normalize)
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{
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const char* ftpRoot;
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int len;
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ftpRoot = ftpGetRoot(sessions[id].userId, &len);
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if(VERBOSE_MODE_ENABLED) printf("#1 ftpGetRealPath id = %d path [%s] ftpRoot [%s] sessions[id].workingDir [%s] normalize = %d\n", id, path, ftpRoot, sessions[id].workingDir,normalize);
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pathScratchBuf[0]='\0';
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if(path[0] == '/' || strcmp(path,sessions[id].workingDir) == 0) // absolute path?
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{
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ftpMergePaths(pathScratchBuf, ftpRoot, path, NULL);
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}
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else
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{
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ftpMergePaths(pathScratchBuf, ftpRoot, sessions[id].workingDir, "/", path, NULL);
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//ftpMergePaths(pathScratchBuf, ftpRoot, path, NULL);
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}
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if(VERBOSE_MODE_ENABLED) printf("#2 ftpGetRealPath path [%s] ftpRoot [%s] pathScratchBuf [%s]\n", path, ftpRoot, pathScratchBuf);
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ftpRemoveDoubleSlash(pathScratchBuf);
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if(normalize) {
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normalizePath(pathScratchBuf);
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}
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ftpRemoveTrailingSlash(pathScratchBuf);
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if(VERBOSE_MODE_ENABLED) printf("#2 ftpGetRealPath path [%s] ftpRoot [%s] pathScratchBuf [%s]\n", path, ftpRoot, pathScratchBuf);
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return pathScratchBuf;
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}
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/**
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* @brief Change the current working directory of the session
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*
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* @param id Session id
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* @param path destination ftp path (can be relative or absolute)
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*
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* @return 0 on success; -2 if the directory doesn't exist
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*/
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int ftpChangeDir(int id, const char* path)
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{
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ftpPathInfo_S fileInfo;
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const char* realPath = ftpGetRealPath(id, path, TRUE);
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int len;
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ftpGetRoot(sessions[id].userId, &len); // determine len of root-path
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if(len == 1) // if len == 1 root-path == '/'
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len = 0;
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if(VERBOSE_MODE_ENABLED) printf("ftpChangeDir path [%s] realPath [%s] sessions[id].workingDir [%s]\n", path, realPath, sessions[id].workingDir);
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if(ftpStat(realPath, &fileInfo) || (fileInfo.type != TYPE_DIR)) // directory accessible?
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return -2;
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strncpy(sessions[id].workingDir, &realPath[len], MAX_PATH_LEN); // apply path
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if(sessions[id].workingDir[0] == '\0')
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strcpy(sessions[id].workingDir, "/");
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if(VERBOSE_MODE_ENABLED) printf("ftpChangeDir path [%s] realPath [%s] NEW sessions[id].workingDir [%s]\n", path, realPath, sessions[id].workingDir);
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return 0;
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}
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/**
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* @todo documentation
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*/
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void ftpOpenTransmission(int id, operation_E op, void* fsHandle, socket_t dataSocket, uint32_t fileSize)
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{
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actTransCnt++;
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sessions[id].activeTrans.op = op;
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sessions[id].activeTrans.fsHandle = fsHandle;
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sessions[id].activeTrans.dataSocket = dataSocket;
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sessions[id].activeTrans.fileSize = fileSize;
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}
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/**
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* @todo documentation
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*/
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void ftpCloseTransmission(int id)
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{
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if(sessions[id].activeTrans.op != OP_NOP) // is thera an active transmission?
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{
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ftpCloseSocket(sessions[id].activeTrans.dataSocket);
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if(sessions[id].activeTrans.op == OP_LIST)
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{
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ftpCloseDir(sessions[id].activeTrans.fsHandle);
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}
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else
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{
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ftpCloseFile(sessions[id].activeTrans.fsHandle);
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}
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sessions[id].activeTrans.op = OP_NOP;
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actTransCnt--;
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}
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}
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/**
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* @todo documentation
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*/
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int ftpGetActiveTransCnt(void)
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{
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return actTransCnt;
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}
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