/***************************************************************************//*									   *//* 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.						   *//* 									   *//***************************************************************************/#if defined(__unix__) || defined(__VMS)#include <unistd.h>#endif#if defined(_WIN32)#include <windows.h>#endif#include <stdio.h>#include <stdlib.h>#include <string.h>#include <errno.h>#include <ctype.h>#if defined(__unix__)#include <sys/time.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <netdb.h>#include <arpa/inet.h>#elif defined(VMS)#include <types.h>#include <socket.h>#include <in.h>#include <netdb.h>#include <inet.h>#elif defined(_WIN32)#include <winsock.h>#endif#define BUILDING_LIBRARY#include "ftplib.h"#if defined(_WIN32)#define SETSOCKOPT_OPTVAL_TYPE (const char *)#else#define SETSOCKOPT_OPTVAL_TYPE (void *)#endif#define FTPLIB_BUFSIZ 8192#define ACCEPT_TIMEOUT 30#define FTPLIB_CONTROL 0#define FTPLIB_READ 1#define FTPLIB_WRITE 2#if !defined FTPLIB_DEFMODE#define FTPLIB_DEFMODE FTPLIB_PASSIVE#endifstruct NetBuf {    char *cput,*cget;    int handle;    int cavail,cleft;    char *buf;    int dir;    netbuf *ctrl;    int cmode;    struct timeval idletime;    FtpCallback idlecb;    void *idlearg;    int xfered;    int cbbytes;    int xfered1;    char response[256];};static char *version =    "ftplib Release 3.1 6/xx/98, copyright 1996, 1997, 1998 Thomas Pfau";GLOBALDEF int ftplib_debug = 0;#if defined(__unix__) || defined(VMS)#define net_read read#define net_write write#define net_close close#elif defined(_WIN32)#define net_read(x,y,z) recv(x,y,z,0)#define net_write(x,y,z) send(x,y,z,0)#define net_close closesocket#endif#if defined(NEED_MEMCCPY)/* * VAX C does not supply a memccpy routine so I provide my own */void *memccpy(void *dest, const void *src, int c, size_t n){    int i=0;    const unsigned char *ip=src;    unsigned char *op=dest;    while (i < n)    {	if ((*op++ = *ip++) == c)	    break;	i++;    }    if (i == n)	return NULL;    return op;}#endif#if defined(NEED_STRDUP)/* * strdup - return a malloc'ed copy of a string */char *strdup(const char *src){    int l = strlen(src) + 1;    char *dst = malloc(l);    if (dst)        strcpy(dst,src);    return dst;}#endif/* * socket_wait - wait for socket to receive or flush data * * return 1 if no user callback, otherwise, return value returned by * user callback */static int socket_wait(netbuf *ctl){    fd_set fd,*rfd = NULL,*wfd = NULL;    struct timeval tv;    int rv = 0;    if ((ctl->dir == FTPLIB_CONTROL) || (ctl->idlecb == NULL))	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, ctl->xfered, ctl->idlearg)));    return rv;}/* * read a line of text * * return -1 on error or bytecount */static int readline(char *buf,int max,netbuf *ctl)///*buf{    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 = 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 ((x = net_read(ctl->handle,ctl->cput,ctl->cleft)) == -1)    	{	    perror("read");	    retval = -1;	    break;    	}	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 */static int 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;		w = net_write(nData->handle, nbp, FTPLIB_BUFSIZ);		if (w != FTPLIB_BUFSIZ)		{		    printf("net_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;	    w = net_write(nData->handle, nbp, FTPLIB_BUFSIZ);	    if (w != FTPLIB_BUFSIZ)	    {		printf("net_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;	w = net_write(nData->handle, nbp, nb);	if (w != nb)	{	    printf("net_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 */static int readresp(char c, netbuf *nControl){    char match[5];    if (readline(nControl->response,256,nControl) == -1)    {	perror("Control socket read failed");	return 0;    }    if (ftplib_debug > 1)	fprintf(stderr,"%s",nControl->response);    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;	    }	    if (ftplib_debug > 1)		fprintf(stderr,"%s",nControl->response);	}	while (strncmp(nControl->response,match,4));    }    if (nControl->response[0] == c)	return 1;    return 0;}/* * FtpInit for stupid operating systems that require it (Windows NT) */GLOBALDEF void FtpInit(void){#if defined(_WIN32)    WORD wVersionRequested;    WSADATA wsadata;    int err;    wVersionRequested = MAKEWORD(1,1);    if ((err = WSAStartup(wVersionRequested,&wsadata)) != 0)	fprintf(stderr,"Network failed to start: %d\n",err);#endif}/* * FtpLastResponse - return a pointer to the last response received */GLOBALDEF char *FtpLastResponse(netbuf *nControl){    if ((nControl) && (nControl->dir == FTPLIB_CONTROL))    	return nControl->response;    return NULL;}/* * FtpConnect - connect to remote server * * return 1 if connected, 0 if not */GLOBALDEF int FtpConnect(const char *host, netbuf **nControl){    int sControl;    struct sockaddr_in sin;    struct hostent *phe;    struct servent *pse;    int on=1;    netbuf *ctrl;    char *lhost;    char *pnum;    memset(&sin,0,sizeof(sin));    sin.sin_family = AF_INET;    lhost = strdup(host);    pnum = strchr(lhost,':');    if (pnum == NULL)    {#if defined(VMS)    	sin.sin_port = htons(21);#else    	if ((pse = getservbyname("ftp","tcp")) == NULL)    	{	    perror("getservbyname");	    return 0;    	}    	sin.sin_port = pse->s_port;#endif    }    else    {	*pnum++ = '\0';	if (isdigit(*pnum))	    sin.sin_port = htons(atoi(pnum));	else	{	    pse = getservbyname(pnum,"tcp");	    sin.sin_port = pse->s_port;	}    }    if ((sin.sin_addr.s_addr = inet_addr(lhost)) == -1)    {    	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");	net_close(sControl);	return 0;    }    if (connect(sControl, (struct sockaddr *)&sin, sizeof(sin)) == -1)    {	perror("connect");	net_close(sControl);	return 0;    }    ctrl = calloc(1,sizeof(netbuf));    if (ctrl == NULL)    {	perror("calloc");	net_close(sControl);	return 0;    }    ctrl->buf = malloc(FTPLIB_BUFSIZ);    if (ctrl->buf == NULL)    {	perror("calloc");	net_close(sControl);	free(ctrl);	return 0;    }    ctrl->handle = sControl;    ctrl->dir = FTPLIB_CONTROL;    ctrl->ctrl = NULL;    ctrl->cmode = FTPLIB_DEFMODE;    ctrl->idlecb = NULL;    ctrl->idletime.tv_sec = ctrl->idletime.tv_usec = 0;    ctrl->idlearg = NULL;    ctrl->xfered = 0;    ctrl->xfered1 = 0;    ctrl->cbbytes = 0;    if (readresp('2', ctrl) == 0)    {	net_close(sControl);	free(ctrl->buf);	free(ctrl);	return 0;    }    *nControl = ctrl;    return 1;}/* * FtpOptions - change connection options * * returns 1 if successful, 0 on error */GLOBALDEF int FtpOptions(int opt, long val, netbuf *nControl){    int v,rv=0;    switch (opt)    {      case FTPLIB_CONNMODE:	v = (int) val;	if ((v == FTPLIB_PASSIVE) || (v == FTPLIB_PORT))	{	    nControl->cmode = v;	    rv = 1;	}	break;      case FTPLIB_CALLBACK:	nControl->idlecb = (FtpCallback) val;	rv = 1;	break;      case FTPLIB_IDLETIME:	v = (int) val;	rv = 1;	nControl->idletime.tv_sec = v / 1000;	nControl->idletime.tv_usec = (v % 1000) * 1000;	break;      case FTPLIB_CALLBACKARG:	rv = 1;	nControl->idlearg = (void *) val;	break;      case FTPLIB_CALLBACKBYTES:        rv = 1;        nControl->cbbytes = (int) val;        break;    }    return rv;}/* * FtpSendCmd - send a command and wait for expected response * * return 1 if proper response received, 0 otherwise */static int FtpSendCmd(const char *cmd, char expresp, netbuf *nControl){    char buf[256];    if (nControl->dir != FTPLIB_CONTROL)	return 0;    if (ftplib_debug > 2)	fprintf(stderr,"%s\n",cmd);    if ((strlen(cmd) + 3) > sizeof(buf))        return 0;    sprintf(buf,"%s\r\n",cmd);    if (net_write(nControl->handle,buf,strlen(buf)) <= 0)    {	perror("write");	return 0;    }    return readresp(expresp, nControl);}/* * FtpLogin - log in to remote server * * return 1 if logged in, 0 otherwise */GLOBALDEF int FtpLogin(const char *user, const char *pass, netbuf *nControl){    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',nControl))    {	if (nControl->response[0] == '2')	    return 1;	return 0;    }    sprintf(tempbuf,"PASS %s",pass);    return FtpSendCmd(tempbuf,'2',nControl);}/* * FtpOpenPort - set up data connection * * return 1 if successful, 0 otherwise */static int FtpOpenPort(netbuf *nControl, netbuf **nData, int mode, int dir){    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 int v[6];    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 (nControl->cmode == FTPLIB_PASSIVE)    {	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,"%u,%u,%u,%u,%u,%u",&v[2],&v[3],&v[4],&v[5],&v[0],&v[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];    }    else    {	if (getsockname(nControl->handle, &sin.sa, &l) < 0)	{	    perror("getsockname");	    return 0;	}    }