kasablanca/src/ftplib.cpp

/***************************************************************************
                          ftplib.cpp  -  description
                             -------------------
    begin                : Son Jul 27 2003
    copyright            : (C) 2003 by mkulke
    email                : sikor_sxe@radicalapproach.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

/* original unmodified copyright notes from Thomas Pfau */
 
/***************************************************************************/
/*									   */
/* ftplib.c - callable ftp access routines				   */
/* Copyright (C) 1996, 1997, 1998 Thomas Pfau, pfau@cnj.digex.net	   */
/*	73 Catherine Street, South Bound Brook, NJ, 08880		   */
/*									   */
/* This library is free software; you can redistribute it and/or	   */
/* modify it under the terms of the GNU Library General Public		   */
/* License as published by the Free Software Foundation; either		   */
/* version 2 of the License, or (at your option) any later version.	   */
/* 									   */
/* This library 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	   */
/* Library General Public License for more details.			   */
/* 									   */
/* You should have received a copy of the GNU Library General Public	   */
/* License along with this progam; if not, write to the			   */
/* Free Software Foundation, Inc., 59 Temple Place - Suite 330,		   */
/* Boston, MA 02111-1307, USA.						   */
/* 									   */
/***************************************************************************/

#include "ftplib.h"
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <string>

using namespace std;

/* socket values */
#define SETSOCKOPT_OPTVAL_TYPE (void *)
#define FTPLIB_BUFSIZ 1024
#define ACCEPT_TIMEOUT 30

/* io types */
#define FTPLIB_CONTROL 0
#define FTPLIB_READ 1
#define FTPLIB_WRITE 2

/*
 * Constructor
 */

ftplib::ftplib()
{
	SSL_library_init();

	mp_netbuf = static_cast<netbuf *>(calloc(1,sizeof(netbuf)));
	if (mp_netbuf == NULL) perror("calloc");
	mp_netbuf->buf = static_cast<char *>(malloc(FTPLIB_BUFSIZ));
	if (mp_netbuf->buf == NULL)
	{
		perror("calloc");
		free(mp_netbuf);
	}
	mp_netbuf->ctx = SSL_CTX_new(SSLv23_method());
	SSL_CTX_set_verify(mp_netbuf->ctx, SSL_VERIFY_NONE, NULL);
	mp_netbuf->ssl = SSL_new(mp_netbuf->ctx);

	ClearNetbuf();
}

/*
 * Destructor
 */

ftplib::~ftplib()
{
	SSL_free(mp_netbuf->ssl);
	SSL_CTX_free(mp_netbuf->ctx);
   free(mp_netbuf->buf);
   free(mp_netbuf);
}

/*
 * socket_wait - wait for socket to receive or flush data
 *
 * return 1 if no user callback, otherwise, return value returned by
 * user callback
 */
int ftplib::socket_wait(netbuf *ctl)
{
	fd_set fd,*rfd = NULL,*wfd = NULL;
	struct timeval tv;
	int rv = 0;

	if (ctl->idlecb == NULL) return 1;

	/*if ((ctl->dir == FTPLIB_CONTROL)
		|| (ctl->idlecb == NULL)
		|| ((ctl->idletime.tv_sec == 0)
		&& //(ctl->idletime.tv_usec 0))
	return 1;*/

	if (ctl->dir == FTPLIB_WRITE) wfd = &fd;
	else rfd = &fd;

	FD_ZERO(&fd);
	do
	{
		FD_SET(ctl->handle,&fd);
		tv = ctl->idletime;
		rv = select(ctl->handle+1, rfd, wfd, NULL, &tv);
		if (rv == -1)
		{
			rv = 0;
			strncpy(ctl->ctrl->response, strerror(errno), sizeof(ctl->ctrl->response));
			break;
		}
		else if (rv > 0)
		{
			rv = 1;
			break;
		}
	} while ((rv = ctl->idlecb(ctl->cbarg)));

	return rv;
}

/*
 * read a line of text
 *
 * return -1 on error or bytecount
 */
int ftplib::readline(char *buf,int max,netbuf *ctl)
{
	int x,retval = 0;
	char *end,*bp=buf;
	int eof = 0;

	if ((ctl->dir != FTPLIB_CONTROL) && (ctl->dir != FTPLIB_READ))
	return -1;
	if (max == 0)
	return 0;
	do
	{
		if (ctl->cavail > 0)
		{
			x = (max >= ctl->cavail) ? ctl->cavail : max-1;
			end = static_cast<char*>(memccpy(bp,ctl->cget,'\n',x));
			if (end != NULL)
			x = end - bp;
			retval += x;
			bp += x;
			*bp = '\0';
			max -= x;
			ctl->cget += x;
			ctl->cavail -= x;
			if (end != NULL)
			{
				bp -= 2;
				if (strcmp(bp,"\r\n") == 0)
				{
					*bp++ = '\n';
					*bp++ = '\0';
					--retval;
				}
				break;
			}
		}
		if (max == 1)
		{
			*buf = '\0';
			break;
		}
		if (ctl->cput == ctl->cget)
		{
			ctl->cput = ctl->cget = ctl->buf;
			ctl->cavail = 0;
			ctl->cleft = FTPLIB_BUFSIZ;
		}
		if (eof)
		{
			if (retval == 0)
			retval = -1;
			break;
		}

		if (!socket_wait(ctl)) return retval;

		if (ctl->tlsdata) x = SSL_read(ctl->ssl, ctl->cput, ctl->cleft);
		else
		{
			if (ctl->tlsctrl) x = SSL_read(ctl->ssl, ctl->cput, ctl->cleft);
			else x = read(ctl->handle,ctl->cput,ctl->cleft);
		}
		if ( x == -1)
		{
			perror("read");
			retval = -1;
			break;
		}

		// LOGGING FUNCTIONALITY!!!

		if ((ctl->dir == FTPLIB_CONTROL) && (mp_netbuf->logcb != NULL))
		{
			*((ctl->cput)+x) = '\0';
			mp_netbuf->logcb(ctl->cput, mp_netbuf->cbarg, true);
		}

		if (x == 0) eof = 1;
		ctl->cleft -= x;
		ctl->cavail += x;
		ctl->cput += x;
	} while (1);
	return retval;
}

/*
 * write lines of text
 *
 * return -1 on error or bytecount
 */
int ftplib::writeline(char *buf, int len, netbuf *nData)
{
	int x, nb=0, w;
	char *ubp = buf, *nbp;
	char lc=0;

	if (nData->dir != FTPLIB_WRITE)
	return -1;
	nbp = nData->buf;
	for (x=0; x < len; x++)
	{
		if ((*ubp == '\n') && (lc != '\r'))
		{
			if (nb == FTPLIB_BUFSIZ)
			{
				if (!socket_wait(nData)) return x;

				if (nData->tlsctrl) w = SSL_write(nData->ssl, nbp, FTPLIB_BUFSIZ);
				else w = write(nData->handle, nbp, FTPLIB_BUFSIZ);

				if (w != FTPLIB_BUFSIZ)
				{
					printf("write(1) returned %d, errno = %d\n", w, errno);
					return(-1);
				}
				nb = 0;
			}
			nbp[nb++] = '\r';
		}
		if (nb == FTPLIB_BUFSIZ)
		{
			if (!socket_wait(nData))
			return x;

			if (nData->tlsctrl) w = SSL_write(nData->ssl, nbp, FTPLIB_BUFSIZ);
			else w = write(nData->handle, nbp, FTPLIB_BUFSIZ);

			if (w != FTPLIB_BUFSIZ)
			{
				printf("write(2) returned %d, errno = %d\n", w, errno);
				return(-1);
			}
			nb = 0;
		}
		nbp[nb++] = lc = *ubp++;
	}
	if (nb)
	{
		if (!socket_wait(nData)) return x;
		if (nData->tlsctrl) w = SSL_write(nData->ssl, nbp, nb);
		else w = write(nData->handle, nbp, nb);
		if (w != nb)
		{
			printf("write(3) returned %d, errno = %d\n", w, errno);
			return(-1);
		}
	}
	return len;
}

/*
 * read a response from the server
 *
 * return 0 if first char doesn't match
 * return 1 if first char matches
 */
int ftplib::readresp(char c, netbuf *nControl)
{
	char match[5];
	
	if (readline(nControl->response,256,nControl) == -1)
	{
		perror("Control socket read failed");
		return 0;
	}
	
	if (nControl->response[3] == '-')
	{
		strncpy(match,nControl->response,3);
		match[3] = ' ';
		match[4] = '\0';
		do
		{
			if (readline(nControl->response,256,nControl) == -1)
			{
				perror("Control socket read failed");
				return 0;
			}
		} while (strncmp(nControl->response,match,4));
	}
	if (nControl->response[0] == c) return 1;
	return 0;
}

/*
 * FtpLastResponse - return a pointer to the last response received
 */
char* ftplib::LastResponse()
{
	if ((mp_netbuf) && (mp_netbuf->dir == FTPLIB_CONTROL)) return mp_netbuf->response;
	return NULL;
}

/*
 * ftplib::Connect - connect to remote server
 *
 * return 1 if connected, 0 if not
 */
int ftplib::Connect(const char *host)
{
	int sControl;
	struct sockaddr_in sin;
	struct hostent *phe;
	struct servent *pse;
	int on=1;
	int ret;
	char *lhost;
	char *pnum;
	
	mp_netbuf->dir = FTPLIB_CONTROL;
	mp_netbuf->ctrl = NULL;
	mp_netbuf->xfered = 0;
	mp_netbuf->xfered1 = 0;
	mp_netbuf->tlsctrl = 0;
	mp_netbuf->tlsdata = 0;
	mp_netbuf->offset = 0;
	mp_netbuf->handle = 0;
	
	memset(&sin,0,sizeof(sin));
	sin.sin_family = AF_INET;
	lhost = strdup(host);
	pnum = strchr(lhost,':');
	if (pnum == NULL)
	{
		if ((pse = getservbyname("ftp","tcp")) == NULL)
		{
		perror("getservbyname");
		return 0;
		}
		sin.sin_port = pse->s_port;
	}
	else
	{
		*pnum++ = '\0';
		if (isdigit(*pnum)) sin.sin_port = htons(atoi(pnum));
		else
		{
			pse = getservbyname(pnum,"tcp");
			sin.sin_port = pse->s_port;
		}
	}
	
	ret = inet_aton(lhost, &sin.sin_addr);
	if (ret == 0)
	{
		if ((phe = gethostbyname(lhost)) == NULL)
		{
		perror("gethostbyname");
		return 0;
		}
		memcpy((char *)&sin.sin_addr, phe->h_addr, phe->h_length);
	}
	free(lhost);
	sControl = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (sControl == -1)
	{
		perror("socket");
		return 0;
	}
	if (setsockopt(sControl,SOL_SOCKET,SO_REUSEADDR, SETSOCKOPT_OPTVAL_TYPE &on, sizeof(on)) == -1)
	{
		perror("setsockopt");
		close(sControl);
		return 0;
	}
	if (connect(sControl, (struct sockaddr *)&sin, sizeof(sin)) == -1)
	{
		perror("connect");
		close(sControl);
		return 0;
	}

	mp_netbuf->handle = sControl;

	if (readresp('2', mp_netbuf) == 0)
	{
		close(sControl);
		mp_netbuf->handle = 0;
		return 0;
	}

	return 1;
}

/*
 * FtpSendCmd - send a command and wait for expected response
 *
 * return 1 if proper response received, 0 otherwise
 */
int ftplib::FtpSendCmd(const char *cmd, char expresp, netbuf *nControl)
{
	char buf[256];
	int x;

	if (!nControl->handle) return 0;

	if (nControl->dir != FTPLIB_CONTROL) return 0;
	sprintf(buf,"%s\r\n",cmd);

	if (nControl->tlsctrl) x = SSL_write(nControl->ssl,buf,strlen(buf));
	else x = write(nControl->handle,buf,strlen(buf));

	if (x <= 0)
	{
		perror("write");
		return 0;
	}

	if (mp_netbuf->logcb != NULL) mp_netbuf->logcb(buf, mp_netbuf->cbarg, false);
	
	return readresp(expresp, nControl);
}

/*
 * FtpLogin - log in to remote server
 *
 * return 1 if logged in, 0 otherwise
 */
int ftplib::Login(const char *user, const char *pass)
{
	char tempbuf[64];

	if (((strlen(user) + 7) > sizeof(tempbuf)) || ((strlen(pass) + 7) > sizeof(tempbuf))) return 0;
	sprintf(tempbuf, "USER %s", user);
	if (!FtpSendCmd(tempbuf,'3',mp_netbuf))
	{
		if (mp_netbuf->ctrl != NULL) return 1;
		if (*LastResponse() == '2') return 1;
		return 0;
	}
	sprintf(tempbuf,"PASS %s",pass);
	return FtpSendCmd(tempbuf,'2',mp_netbuf);
}

/*
 * FtpAcceptConnection - accept connection from server
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::FtpAcceptConnection(netbuf *nData, netbuf *nControl)
{
	int sData;
	struct sockaddr addr;
	unsigned int l;
	int i;
	struct timeval tv;
	fd_set mask;
	int rv = 0;

	FD_ZERO(&mask);
	FD_SET(nControl->handle, &mask);
	FD_SET(nData->handle, &mask);
	tv.tv_usec = 0;
	tv.tv_sec = ACCEPT_TIMEOUT;
	i = nControl->handle;
	if (i < nData->handle) i = nData->handle;
	i = select(i+1, &mask, NULL, NULL, &tv);

	if (i == -1)
	{
		strncpy(nControl->response, strerror(errno), sizeof(nControl->response));
		close(nData->handle);
		nData->handle = 0;
		rv = 0;
	}
	else if (i == 0)
	{
		strcpy(nControl->response, "timed out waiting for connection");
		close(nData->handle);
		nData->handle = 0;
		rv = 0;
	}
	else
	{
		if (FD_ISSET(nData->handle, &mask))
		{
			l = sizeof(addr);
			sData = accept(nData->handle, &addr, &l);
			i = errno;
			close(nData->handle);
			if (sData > 0)
			{
				rv = 1;
				nData->handle = sData;
				nData->ctrl = nControl;
			}
			else
			{
				strncpy(nControl->response, strerror(i), sizeof(nControl->response));
				nData->handle = 0;
				rv = 0;
			}
		}
		else if (FD_ISSET(nControl->handle, &mask))
		{
			close(nData->handle);
			nData->handle = 0;
			readresp('2', nControl);
			rv = 0;
		}
	}
	return rv;
}

/*
 * FtpAccess - return a handle for a data stream
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::FtpAccess(const char *path, int typ, int mode, netbuf *nControl, netbuf **nData)
//int ftplib::FtpAccess(const char *path, int typ, int mode)
{
	char buf[256];
	int dir, ret;

	if ((path == NULL) && ((typ == FTPLIB_FILE_WRITE)
		|| (typ == FTPLIB_FILE_READ)
		|| (typ == FTPLIB_FILE_READ_APPEND)
		|| (typ == FTPLIB_FILE_WRITE_APPEND)))
	{
		sprintf(nControl->response,"Missing path argument for file transfer\n");
		return 0;
	}
	sprintf(buf, "TYPE %c", mode);
	if (!FtpSendCmd(buf, '2', nControl)) return 0;

	switch (typ)
	{
	case FTPLIB_DIR:
		strcpy(buf,"NLST");
		dir = FTPLIB_READ;
		break;
	case FTPLIB_DIR_VERBOSE:
		strcpy(buf,"LIST -aL");
		dir = FTPLIB_READ;
		break;
	case FTPLIB_FILE_READ_APPEND:
	case FTPLIB_FILE_READ:
		strcpy(buf,"RETR");
		dir = FTPLIB_READ;
		break;
	case FTPLIB_FILE_WRITE_APPEND:
	case FTPLIB_FILE_WRITE:
		strcpy(buf,"STOR");
		dir = FTPLIB_WRITE;
		break;
	default:
		sprintf(nControl->response, "Invalid open type %d\n", typ);
		return 0;
	}
	if (path != NULL)
	{
		int i = strlen(buf);
		buf[i++] = ' ';
		if ((strlen(path) + i) >= sizeof(buf)) return 0;
		strcpy(&buf[i],path);
	}

	if (nControl->cmode == ftplib::pasv)
	{
		if (FtpOpenPasv(nControl, nData, mode, dir, buf) == -1) return 0;
	}

	if (nControl->cmode == ftplib::port)
	{
		if (FtpOpenPort(nControl, nData, mode, dir, buf) == -1) return 0;
		if (!FtpAcceptConnection(*nData,nControl))
		{
			FtpClose(*nData);
			*nData = NULL;
			return 0;
		}
	}

	if (nControl->tlsdata)
	{
		(*nData)->ssl = SSL_new(nControl->ctx);
		(*nData)->sbio = BIO_new_socket((*nData)->handle, BIO_NOCLOSE);
		SSL_set_bio((*nData)->ssl,(*nData)->sbio,(*nData)->sbio);
		ret = SSL_connect((*nData)->ssl);
		if (ret != 1) return 0;
		(*nData)->tlsdata = 1;
	}

	return 1;
}

/*
 * FtpOpenPort - Establishes a PORT connection for data transfer
 *
 * return 1 if successful, -1 otherwise
 */
int ftplib::FtpOpenPort(netbuf *nControl, netbuf **nData, int mode, int dir, char *cmd)
{
	int sData;
	union {
	struct sockaddr sa;
	struct sockaddr_in in;
	} sin;
	struct linger lng = { 0, 0 };
	unsigned int l;
	int on=1;
	netbuf *ctrl;
	char buf[256];

	if (nControl->dir != FTPLIB_CONTROL) return -1;
	if ((dir != FTPLIB_READ) && (dir != FTPLIB_WRITE))
	{
		sprintf(nControl->response, "Invalid direction %d\n", dir);
		return -1;
	}
	if ((mode != ftplib::ascii) && (mode != ftplib::image))
	{
		sprintf(nControl->response, "Invalid mode %c\n", mode);
		return -1;
	}
	l = sizeof(sin);

	if (getsockname(nControl->handle, &sin.sa, &l) < 0)
	{
		perror("getsockname");
		return -1;
	}

	sData = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
	if (sData == -1)
	{
		perror("socket");
		return -1;
	}
	if (setsockopt(sData,SOL_SOCKET,SO_REUSEADDR, SETSOCKOPT_OPTVAL_TYPE &on,sizeof(on)) == -1)
	{
		perror("setsockopt");
		close(sData);
		return -1;
	}
	if (setsockopt(sData,SOL_SOCKET,SO_LINGER, SETSOCKOPT_OPTVAL_TYPE &lng,sizeof(lng)) == -1)
	{
		perror("setsockopt");
		close(sData);
		return -1;
	}

	sin.in.sin_port = 0;
	if (bind(sData, &sin.sa, sizeof(sin)) == -1)
	{
		perror("bind");
		close(sData);
		return -1;
	}
	if (listen(sData, 1) < 0)
	{
		perror("listen");
		close(sData);
		return -1;
	}
	if (getsockname(sData, &sin.sa, &l) < 0) return 0;
	sprintf(buf, "PORT %hhu,%hhu,%hhu,%hhu,%hhu,%hhu",
		(unsigned char) sin.sa.sa_data[2],
		(unsigned char) sin.sa.sa_data[3],
		(unsigned char) sin.sa.sa_data[4],
		(unsigned char) sin.sa.sa_data[5],
		(unsigned char) sin.sa.sa_data[0],
		(unsigned char) sin.sa.sa_data[1]);
	if (!FtpSendCmd(buf,'2',nControl))
	{
		close(sData);
		return -1;
	}

	if (mp_netbuf->offset != 0)
	{
	char buf[256];
	sprintf(buf,"REST %lld", mp_netbuf->offset);
	if (!FtpSendCmd(buf,'3',nControl))
	{
		close(sData);
		return 0;
	}
	}

	ctrl = static_cast<netbuf*>(calloc(1,sizeof(netbuf)));
	if (ctrl == NULL)
	{
		perror("calloc");
		close(sData);
		return -1;
	}
	if ((mode == 'A') && ((ctrl->buf = static_cast<char*>(malloc(FTPLIB_BUFSIZ))) == NULL))
	{
		perror("calloc");
		close(sData);
		free(ctrl);
		return -1;
	}

	if (!FtpSendCmd(cmd, '1', nControl))
	{
		FtpClose(*nData);
		*nData = NULL;
		free(ctrl);
		return -1;
	}

	ctrl->handle = sData;
	ctrl->dir = dir;
	ctrl->ctrl = (nControl->cmode == ftplib::pasv) ? nControl : NULL;
	ctrl->idletime = nControl->idletime;
	ctrl->cbarg = nControl->cbarg;
	ctrl->xfered = 0;
	ctrl->xfered1 = 0;
	ctrl->cbbytes = nControl->cbbytes;
	if (ctrl->idletime.tv_sec || ctrl->idletime.tv_usec) ctrl->idlecb = nControl->idlecb;
	else ctrl->idlecb = NULL;
	if (ctrl->cbbytes ) ctrl->xfercb = nControl->xfercb;
	else ctrl->xfercb = NULL;
	*nData = ctrl;

	return 1;
}

/*
 * FtpOpenPasv - Establishes a PASV connection for data transfer
 *
 * return 1 if successful, -1 otherwise
 */
int ftplib::FtpOpenPasv(netbuf *nControl, netbuf **nData, int mode, int dir, char *cmd)
{
	int sData;
	union {
		struct sockaddr sa;
		struct sockaddr_in in;
	} sin;
	struct linger lng = { 0, 0 };
	unsigned int l;
	int on=1;
	netbuf *ctrl;
	char *cp;
	unsigned char v[6];
	int ret;

	if (nControl->dir != FTPLIB_CONTROL) return -1;
	if ((dir != FTPLIB_READ) && (dir != FTPLIB_WRITE))
	{
		sprintf(nControl->response, "Invalid direction %d\n", dir);
		return -1;
	}
	if ((mode != ftplib::ascii) && (mode != ftplib::image))
	{
		sprintf(nControl->response, "Invalid mode %c\n", mode);
		return -1;
	}
	l = sizeof(sin);

	memset(&sin, 0, l);
	sin.in.sin_family = AF_INET;
	if (!FtpSendCmd("PASV",'2',nControl)) return -1;
	cp = strchr(nControl->response,'(');
	if (cp == NULL) return -1;
	cp++;
	sscanf(cp,"%hhu,%hhu,%hhu,%hhu,%hhu,%hhu",&v[2],&v[3],&v[4],&v[5],&v[0],&v[1]);
	if (nControl->correctpasv) if (!CorrectPasvResponse(v)) return -1;
	sin.sa.sa_data[2] = v[2];
	sin.sa.sa_data[3] = v[3];
	sin.sa.sa_data[4] = v[4];
	sin.sa.sa_data[5] = v[5];
	sin.sa.sa_data[0] = v[0];
	sin.sa.sa_data[1] = v[1];

	if (mp_netbuf->offset != 0)
	{
		char buf[256];
		sprintf(buf,"REST %lld",mp_netbuf->offset);
		if (!FtpSendCmd(buf,'3',nControl)) return 0;
	}

	sData = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
	if (sData == -1)
	{
		perror("socket");
		return -1;
	}
	if (setsockopt(sData,SOL_SOCKET,SO_REUSEADDR, SETSOCKOPT_OPTVAL_TYPE &on,sizeof(on)) == -1)
	{
		perror("setsockopt");
		close(sData);
		return -1;
	}
	if (setsockopt(sData,SOL_SOCKET,SO_LINGER, SETSOCKOPT_OPTVAL_TYPE &lng,sizeof(lng)) == -1)
	{
		perror("setsockopt");
		close(sData);
		return -1;
	}

	if (nControl->dir != FTPLIB_CONTROL) return -1;
	char buf[256];
	sprintf(buf,"%s\r\n",cmd);
	if (nControl->tlsctrl) ret = SSL_write(nControl->ssl,buf,strlen(buf));
	else ret = write(nControl->handle,buf,strlen(buf));
	if (ret <= 0)
	{
		perror("write");
		return -1;
	}

	if (connect(sData, &sin.sa, sizeof(sin.sa)) == -1)
	{
		perror("connect");
		close(sData);
		return -1;
	}
	if (!readresp('1', nControl))
	{
		close(sData);
		return -1;
	}
	ctrl = static_cast<netbuf*>(calloc(1,sizeof(netbuf)));
	if (ctrl == NULL)
	{
		perror("calloc");
		close(sData);
		return -1;
	}
	if ((mode == 'A') && ((ctrl->buf = static_cast<char*>(malloc(FTPLIB_BUFSIZ))) == NULL))
	{
		perror("calloc");
		close(sData);
		free(ctrl);
		return -1;
	}
	ctrl->handle = sData;
	ctrl->dir = dir;
	ctrl->ctrl = (nControl->cmode == ftplib::pasv) ? nControl : NULL;
	ctrl->idletime = nControl->idletime;
	ctrl->cbarg = nControl->cbarg;
	ctrl->xfered = 0;
	ctrl->xfered1 = 0;
	ctrl->cbbytes = nControl->cbbytes;
	if (ctrl->idletime.tv_sec || ctrl->idletime.tv_usec) ctrl->idlecb = nControl->idlecb;
	else ctrl->idlecb = NULL;
	if (ctrl->cbbytes ) ctrl->xfercb = nControl->xfercb;
	else ctrl->xfercb = NULL;
	*nData = ctrl;

	return 1;
}

/*
 * FtpClose - close a data connection
 */
int ftplib::FtpClose(netbuf *nData)
{
	netbuf *ctrl;

	if (nData->dir == FTPLIB_WRITE)
	{
		if (nData->buf != NULL) writeline(NULL, 0, nData);
	}
	else if (nData->dir != FTPLIB_READ) return 0;
	if (nData->buf) free(nData->buf);
	shutdown(nData->handle,2);
	close(nData->handle);

	ctrl = nData->ctrl;
	SSL_free(nData->ssl);
	free(nData);
	if (ctrl) return readresp('2', ctrl);
	return 1;
}

/*
 * FtpRead - read from a data connection
 */
int ftplib::FtpRead(void *buf, int max, netbuf *nData)
{
	int i;

	if (nData->dir != FTPLIB_READ)
	return 0;
	if (nData->buf) i = readline(static_cast<char*>(buf), max, nData);
	else
	{
		i = socket_wait(nData);
		if (i != 1) return 0;
		if (nData->tlsdata) i = SSL_read(nData->ssl, buf, max);
		else i = read(nData->handle,buf,max);
	}
	if (i == -1) return 0;
	nData->xfered += i;
	if (nData->xfercb && nData->cbbytes)
	{
		nData->xfered1 += i;
		if (nData->xfered1 > nData->cbbytes)
		{
			if (nData->xfercb(nData->xfered, nData->cbarg) == 0) return 0;
			nData->xfered1 = 0;
		}
	}
	return i;
}

/*
 * FtpWrite - write to a data connection
 */
int ftplib::FtpWrite(void *buf, int len, netbuf *nData)
{
	int i;

	if (nData->dir != FTPLIB_WRITE) return 0;
	if (nData->buf) i = writeline(static_cast<char*>(buf), len, nData);
	else
	{
		socket_wait(nData);
		if (nData->tlsdata) i = SSL_write(nData->ssl, buf, len);
		else i = write(nData->handle, buf, len);
	}
	if (i == -1) return 0;
	nData->xfered += i;

	if (nData->xfercb && nData->cbbytes)
	{
		nData->xfered1 += i;
		if (nData->xfered1 > nData->cbbytes)
		{
			if (nData->xfercb(nData->xfered, nData->cbarg) == 0) return 0;
			nData->xfered1 = 0;
		}
	}
	return i;
}

/*
 * FtpSite - send a SITE command
 *
 * return 1 if command successful, 0 otherwise
 */
int ftplib::Site(const char *cmd)
{
	char buf[256];

	if ((strlen(cmd) + 7) > sizeof(buf)) return 0;
	sprintf(buf,"SITE %s",cmd);
	if (!FtpSendCmd(buf,'2',mp_netbuf)) return 0;
	return 1;
}

/*
 * FtpRaw - send a raw string string
 *
 * return 1 if command successful, 0 otherwise
 */

int ftplib::Raw(const char *cmd)
{
	char buf[256];
	strncpy(buf, cmd, 256);
	if (!FtpSendCmd(buf,'2',mp_netbuf)) return 0;
	return 1;
}

/*
 * FtpSysType - send a SYST command
 *
 * Fills in the user buffer with the remote system type.  If more
 * information from the response is required, the user can parse
 * it out of the response buffer returned by FtpLastResponse().
 *
 * return 1 if command successful, 0 otherwise
 */
int ftplib::SysType(char *buf, int max)
{
	int l = max;
	char *b = buf;
	char *s;
	if (!FtpSendCmd("SYST",'2',mp_netbuf)) return 0;
	s = &mp_netbuf->response[4];
	while ((--l) && (*s != ' ')) *b++ = *s++;
	*b++ = '\0';
	return 1;
}

/*
 * FtpMkdir - create a directory at server
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::Mkdir(const char *path)
{
	char buf[256];

	if ((strlen(path) + 6) > sizeof(buf)) return 0;
	sprintf(buf,"MKD %s",path);
	if (!FtpSendCmd(buf,'2', mp_netbuf)) return 0;
	return 1;
}

/*
 * FtpChdir - change path at remote
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::Chdir(const char *path)
{
	char buf[256];

	if ((strlen(path) + 6) > sizeof(buf)) return 0;
	sprintf(buf,"CWD %s",path);
	if (!FtpSendCmd(buf,'2',mp_netbuf)) return 0;
	return 1;
}

/*
 * FtpCDUp - move to parent directory at remote
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::Cdup()
{
	if (!FtpSendCmd("CDUP",'2',mp_netbuf)) return 0;
	return 1;
}

/*
 * FtpRmdir - remove directory at remote
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::Rmdir(const char *path)
{
	char buf[256];

	if ((strlen(path) + 6) > sizeof(buf)) return 0;
	sprintf(buf,"RMD %s",path);
	if (!FtpSendCmd(buf,'2',mp_netbuf)) return 0;
	return 1;
}

/*
 * FtpPwd - get working directory at remote
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::Pwd(char *path, int max)
{
	int l = max;
	char *b = path;
	char *s;

 	if (!FtpSendCmd("PWD",'2',mp_netbuf)) return 0;
	s = strchr(mp_netbuf->response, '"');
	if (s == NULL) return 0;
   s++;
	while ((--l) && (*s) && (*s != '"')) *b++ = *s++;
	*b++ = '\0';
	return 1;
}

/*
 * FtpXfer - issue a command and transfer data
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::FtpXfer(const char *localfile, const char *path, netbuf *nControl, int typ, int mode)
{
	int l,c;
	char *dbuf;
	FILE *local = NULL;
	netbuf *nData;
	int rv=1; // 3.1-1

	if (localfile != NULL)
	{
		printf("localfile: -%s-", localfile);
	
		//local = fopen(localfile, (typ == FTPLIB_FILE_WRITE) ? "r" : "w");
		char ac[3] = "  ";
		if ((typ == FTPLIB_DIR) || (typ == FTPLIB_DIR_VERBOSE)) { ac[0] = 'w'; ac[1] = '\0'; }
		if (typ == FTPLIB_FILE_READ) { ac[0] = 'w'; ac[1] = '\0'; }
		if (typ == FTPLIB_FILE_WRITE_APPEND) { ac[0] = 'r'; ac[1] = '\0'; }
		if (typ == FTPLIB_FILE_READ_APPEND) { ac[0] = 'a'; ac[1] = '\0'; }
		if (typ == FTPLIB_FILE_WRITE) { ac[0] = 'r'; ac[1] = '\0'; }
		if (mode == ftplib::image) ac[1] = 'b';

		local = fopen(localfile, ac);
		if (typ == FTPLIB_FILE_WRITE_APPEND) fseeko(local,mp_netbuf->offset,SEEK_SET);

		if (local == NULL)
		{
			strncpy(nControl->response, strerror(errno), sizeof(nControl->response));
			return 0;
		}
	}
	if (local == NULL) local = ((typ == FTPLIB_FILE_WRITE)
		|| (typ == FTPLIB_FILE_WRITE_APPEND)) ? stdin : stdout;
	if (!FtpAccess(path, typ, mode, nControl, &nData)) return 0;

	dbuf = static_cast<char*>(malloc(FTPLIB_BUFSIZ));
	if ((typ == FTPLIB_FILE_WRITE) || (typ == FTPLIB_FILE_WRITE_APPEND))
	{
		while ((l = fread(dbuf, 1, FTPLIB_BUFSIZ, local)) > 0)
		{
			if ((c = FtpWrite(dbuf, l, nData)) < l)
			{
				printf("short write: passed %d, wrote %d\n", l, c);
				rv = 0;
				break;
			}
		}
	}
	else
	{
		while ((l = FtpRead(dbuf, FTPLIB_BUFSIZ, nData)) > 0)
		{
			if (fwrite(dbuf, 1, l, local) <= 0)
			{
				perror("localfile write");
				break;
			}
		}
	}
	free(dbuf);
	fflush(local);
	if (localfile != NULL)
	fclose(local);
	return FtpClose(nData);
	return rv;
}

/*
 * FtpNlst - issue an NLST command and write response to output
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::Nlst(const char *outputfile, const char *path)
{
	mp_netbuf->offset = 0;
	return FtpXfer(outputfile, path, mp_netbuf, FTPLIB_DIR, ftplib::ascii);
}

/*
 * FtpDir - issue a LIST command and write response to output
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::Dir(const char *outputfile, const char *path)
{
	mp_netbuf->offset = 0;
	return FtpXfer(outputfile, path, mp_netbuf, FTPLIB_DIR_VERBOSE, ftplib::ascii);
}

/*
 * FtpSize - determine the size of a remote file
 *
 * return 1 if successful, 0 otherwise
 */
//int ftplib::Size(const char *path, int *size, char mode)
int ftplib::Size(const char *path, int *size, ftplib::ftp mode)
{
   char cmd[256];
   int resp,sz,rv=1;

   if ((strlen(path) + 7) > sizeof(cmd)) return 0;

	sprintf(cmd, "TYPE %c", mode);
   if (!FtpSendCmd(cmd, '2', mp_netbuf)) return 0;

	sprintf(cmd,"SIZE %s",path);
   if (!FtpSendCmd(cmd,'2',mp_netbuf)) rv = 0;
   else
   {
		if (sscanf(mp_netbuf->response, "%d %d", &resp, &sz) == 2) *size = sz;
		else rv = 0;
   }
   return rv;
}

/*
 * FtpModDate - determine the modification date of a remote file
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::ModDate(const char *path, char *dt, int max)
{
	char buf[256];
	int rv = 1;

	if ((strlen(path) + 7) > sizeof(buf)) return 0;
	sprintf(buf,"MDTM %s",path);
   if (!FtpSendCmd(buf,'2',mp_netbuf)) rv = 0;
	else strncpy(dt, &mp_netbuf->response[4], max);
	return rv;
}

/*
 * FtpGet - issue a GET command and write received data to output
 *
 * return 1 if successful, 0 otherwise
 */

int ftplib::Get(const char *outputfile, const char *path, ftplib::ftp mode, off64_t offset)
{
	mp_netbuf->offset = offset;
	if (offset == 0) return FtpXfer(outputfile, path, mp_netbuf, FTPLIB_FILE_READ, mode);
	else return FtpXfer(outputfile, path, mp_netbuf, FTPLIB_FILE_READ_APPEND, mode);
}

/*
 * FtpPut - issue a PUT command and send data from input
 *
 * return 1 if successful, 0 otherwise
 */

int ftplib::Put(const char *inputfile, const char *path, ftplib::ftp mode, off64_t offset)
{
	mp_netbuf->offset = offset;
	if (offset == 0) return FtpXfer(inputfile, path, mp_netbuf, FTPLIB_FILE_WRITE, mode);
	else return FtpXfer(inputfile, path, mp_netbuf, FTPLIB_FILE_WRITE_APPEND, mode);
}

/*
 * FtpRename - rename a file at remote
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::Rename(const char *src, const char *dst)
{
	char cmd[256];

	if (((strlen(src) + 7) > sizeof(cmd)) || ((strlen(dst) + 7) > sizeof(cmd))) return 0;
	sprintf(cmd,"RNFR %s",src);
	if (!FtpSendCmd(cmd,'3',mp_netbuf)) return 0;
	sprintf(cmd,"RNTO %s",dst);
	if (!FtpSendCmd(cmd,'2',mp_netbuf)) return 0;

	return 1;
}

/*
 * FtpDelete - delete a file at remote
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::Delete(const char *fnm)
{
	char cmd[256];

	if ((strlen(fnm) + 7) > sizeof(cmd)) return 0;
   sprintf(cmd,"DELE %s",fnm);
   if (!FtpSendCmd(cmd,'2', mp_netbuf)) return 0;
   return 1;
}

/*
 * FtpQuit - disconnect from remote
 *
 * return 1 if successful, 0 otherwise
 */
int ftplib::Quit()
{
	if (mp_netbuf->dir != FTPLIB_CONTROL) return 0;
	if (mp_netbuf->handle == 0)
	{
		strcpy(mp_netbuf->response, "error: no anwser from server\n");
		return 0;
	}
	if (!FtpSendCmd("QUIT",'2',mp_netbuf))
	{
		close(mp_netbuf->handle);
		return 0;
	}
	else
	{
		close(mp_netbuf->handle);
		return 1;
	}
}
 
int ftplib::Fxp(ftplib* src, ftplib* dst, const char *pathSrc, const char *pathDst, ftplib::ftp mode, ftplib::ftp method)
{
	char *cp;
	unsigned char v[6];
	char buf[256];
	int retval = 0;
	
	sprintf(buf, "TYPE %c", mode);
	if (!dst->FtpSendCmd(buf,'2',dst->mp_netbuf)) return -1;
	if (!src->FtpSendCmd(buf,'2',src->mp_netbuf)) return -1;

	if (method == ftplib::defaultfxp)
	{
		// PASV dst

		if (!dst->FtpSendCmd("PASV",'2',dst->mp_netbuf)) return -1;
		cp = strchr(dst->mp_netbuf->response,'(');
		if (cp == NULL) return -1;
		cp++;
		sscanf(cp,"%hhu,%hhu,%hhu,%hhu,%hhu,%hhu",&v[2],&v[3],&v[4],&v[5],&v[0],&v[1]);
		if (dst->mp_netbuf->correctpasv) if (!dst->CorrectPasvResponse(v)) return -1;

		// PORT src

		sprintf(buf, "PORT %d,%d,%d,%d,%d,%d", v[2],v[3],v[4],v[5],v[0],v[1]);
		if (!src->FtpSendCmd(buf,'2',src->mp_netbuf)) return -1;

		// RETR src

		strcpy(buf,"RETR");
		if (pathSrc != NULL)
		{
			int i = strlen(buf);
			buf[i++] = ' ';
			if ((strlen(pathSrc) + i) >= sizeof(buf)) return 0;
			strcpy(&buf[i],pathSrc);
		}
		if (!src->FtpSendCmd(buf, '1', src->mp_netbuf)) return 0;

		// STOR dst

		strcpy(buf,"STOR");
		if (pathDst != NULL)
		{
			int i = strlen(buf);
			buf[i++] = ' ';
			if ((strlen(pathDst) + i) >= sizeof(buf)) return 0;
			strcpy(&buf[i],pathDst);
		}
		if (!dst->FtpSendCmd(buf, '1', dst->mp_netbuf))
		{
			/* this closes the data connection, to abort the RETR on
			the source ftp. all hail pftp, it took me several
			hours and i was absolutely clueless, playing around with
			ABOR and whatever, when i desperately checked the pftp
			source which gave me this final hint. thanks dude(s). */
		
			dst->FtpSendCmd("PASV", '2', dst->mp_netbuf);
			src->readresp('4', src->mp_netbuf);
			return 0;
		}

		retval = (src->readresp('2', src->mp_netbuf)) & (dst->readresp('2', dst->mp_netbuf));

	}
	else 
	{
		// PASV src

		if (!src->FtpSendCmd("PASV",'2',src->mp_netbuf)) return -1;
		cp = strchr(src->mp_netbuf->response,'(');
		if (cp == NULL) return -1;
		cp++;
		sscanf(cp,"%hhu,%hhu,%hhu,%hhu,%hhu,%hhu",&v[2],&v[3],&v[4],&v[5],&v[0],&v[1]);
		if (src->mp_netbuf->correctpasv) if (!src->CorrectPasvResponse(v)) return -1;

		// PORT dst

		sprintf(buf, "PORT %d,%d,%d,%d,%d,%d", v[2],v[3],v[4],v[5],v[0],v[1]);
		if (!dst->FtpSendCmd(buf,'2',dst->mp_netbuf)) return -1;

		// STOR dest

		strcpy(buf,"STOR");
		if (pathDst != NULL)
		{
			int i = strlen(buf);
			buf[i++] = ' ';
			if ((strlen(pathDst) + i) >= sizeof(buf)) return 0;
			strcpy(&buf[i],pathDst);
		}
		if (!dst->FtpSendCmd(buf, '1', dst->mp_netbuf)) return 0;

		// RETR src

		strcpy(buf,"RETR");
		if (pathSrc != NULL)
		{
			int i = strlen(buf);
			buf[i++] = ' ';
			if ((strlen(pathSrc) + i) >= sizeof(buf)) return 0;
			strcpy(&buf[i],pathSrc);
		}
		if (!src->FtpSendCmd(buf, '1', src->mp_netbuf))
		{
			src->FtpSendCmd("PASV", '2', src->mp_netbuf);
			dst->readresp('4', dst->mp_netbuf);
			return 0;
		}

		// wait til its finished!

		retval = (src->readresp('2', src->mp_netbuf)) & (dst->readresp('2', dst->mp_netbuf));

	}

	return retval;
}
int ftplib::SetDataEncryption(ftplib::ftp flag)
{
	if (!mp_netbuf->tlsctrl) return 0;
	if (!FtpSendCmd("PBSZ 0",'2',mp_netbuf)) return 0;
	switch(flag)
	{
	case 0:
		mp_netbuf->tlsdata = 0;
		if (!FtpSendCmd("PROT C",'2',mp_netbuf)) return 0;
		break;
	case 1:
		mp_netbuf->tlsdata = 1;
		if (!FtpSendCmd("PROT P",'2',mp_netbuf)) return 0;
		break;
	default:
		return 0;
	}
	return 1;
}

int ftplib::NegotiateEncryption()
{
	int ret;

	if (!FtpSendCmd("AUTH TLS",'2',mp_netbuf)) return 0;

	mp_netbuf->sbio = BIO_new_socket(mp_netbuf->handle, BIO_NOCLOSE);
	SSL_set_bio(mp_netbuf->ssl,mp_netbuf->sbio,mp_netbuf->sbio);

	ret = SSL_connect(mp_netbuf->ssl);
	if (ret == 1) mp_netbuf->tlsctrl = 1;

	if (ret < 1) return 0;

	return 1;
}

void ftplib::SetCallbackIdleFunction(FtpCallbackIdle pointer)
{
	mp_netbuf->idlecb = pointer;
}

void ftplib::SetCallbackXferFunction(FtpCallbackXfer pointer)
{
	mp_netbuf->xfercb = pointer;
}

void ftplib::SetCallbackLogFunction(FtpCallbackLog pointer)
{
	mp_netbuf->logcb = pointer;
}

void ftplib::SetCallbackArg(void *arg)
{
	mp_netbuf->cbarg = arg;
}

void ftplib::SetCallbackBytes(off64_t bytes)
{
	mp_netbuf->cbbytes = bytes;
}

void ftplib::SetCallbackIdletime(int time)
{
	mp_netbuf->idletime.tv_sec = time / 1000;
	mp_netbuf->idletime.tv_usec = (time % 1000) * 1000;
}

void ftplib::SetConnmode(ftplib::ftp mode)
{
	if ((mode != ftplib::pasv) && (mode != ftplib::port)) mode = ftplib::defaultconnmode;
	mp_netbuf->cmode = mode;
}

void ftplib::ClearNetbuf()
{
	mp_netbuf->dir = FTPLIB_CONTROL;
	mp_netbuf->ctrl = NULL;
	mp_netbuf->cmode = ftplib::defaultconnmode;
	mp_netbuf->idlecb = NULL;
	mp_netbuf->idletime.tv_sec = mp_netbuf->idletime.tv_usec = 0;
	mp_netbuf->cbarg = NULL;
	mp_netbuf->xfered = 0;
	mp_netbuf->xfered1 = 0;
	mp_netbuf->cbbytes = 0;
	mp_netbuf->tlsctrl = 0;
	mp_netbuf->tlsdata = 0;
	mp_netbuf->offset = 0;
	mp_netbuf->handle = 0;
	mp_netbuf->logcb = NULL;
	mp_netbuf->xfercb = NULL;
	mp_netbuf->correctpasv = false;
}

int ftplib::CorrectPasvResponse(unsigned char *v)
{
	struct sockaddr ipholder;
	unsigned int ipholder_size = sizeof(ipholder);

	if (getpeername(mp_netbuf->handle, &ipholder, &ipholder_size) == -1)
	{
		perror("getpeername");
		close(mp_netbuf->handle);
		return 0;
	}
	
	for (int i = 2; i < 6; i++) v[i] = ipholder.sa_data[i];
	
	return 1;
}