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ftplib.c
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ftplib.c
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/***************************************************************************/
/* */
/* ftplib.c - callable ftp access routines */
/* Copyright (C) 1996-2001, 2013, 2016 Thomas Pfau, tfpfau@gmail.com */
/* 1407 Thomas Ave, North Brunswick, NJ, 08902 */
/* */
/* This library is free software. You can redistribute it and/or */
/* modify it under the terms of the Artistic License 2.0. */
/* */
/* 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 */
/* Artistic License 2.0 for more details. */
/* */
/* See the file LICENSE or */
/* http://www.perlfoundation.org/artistic_license_2_0 */
/* */
/***************************************************************************/
#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
#if defined(__APPLE__)
#undef _REENTRANT
#endif
#define BUILDING_LIBRARY
#include "ftplib.h"
#if defined(__UINT64_MAX) && !defined(PRIu64)
#if ULONG_MAX == __UINT32_MAX
#define PRIu64 "llu"
#else
#define PRIu64 "lu"
#endif
#endif
#if defined(_WIN32)
#define SETSOCKOPT_OPTVAL_TYPE (const char *)
#else
#define SETSOCKOPT_OPTVAL_TYPE (void *)
#endif
#define FTPLIB_BUFSIZ 8192
#define RESPONSE_BUFSIZ 1024
#define TMP_BUFSIZ 1024
#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
#endif
struct NetBuf {
char *cput,*cget;
int handle;
int cavail,cleft;
char *buf;
int dir;
netbuf *ctrl;
netbuf *data;
int cmode;
struct timeval idletime;
FtpCallback idlecb;
void *idlearg;
unsigned long int xfered;
unsigned long int cbbytes;
unsigned long int xfered1;
char response[RESPONSE_BUFSIZ];
};
static char *version =
"ftplib Release 4.0 07-Jun-2013, copyright 1996-2003, 2013 Thomas Pfau";
GLOBALDEF int ftplib_debug = 0;
#if defined(__unix__) || defined(VMS)
int net_read(int fd, char *buf, size_t len)
{
while ( 1 )
{
int c = read(fd, buf, len);
if ( c == -1 )
{
if ( errno != EINTR && errno != EAGAIN )
return -1;
}
else
{
return c;
}
}
}
int net_write(int fd, const char *buf, size_t len)
{
int done = 0;
while ( len > 0 )
{
int c = write( fd, buf, len );
if ( c == -1 )
{
if ( errno != EINTR && errno != EAGAIN )
return -1;
}
else if ( c == 0 )
{
return done;
}
else
{
buf += c;
done += c;
len -= c;
}
}
return done;
}
#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)
{
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)
{
if (ftplib_debug)
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(const char *buf, int len, netbuf *nData)
{
int x, nb=0, w;
const char *ubp = buf;
char *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)
{
if (ftplib_debug)
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)
{
if (ftplib_debug)
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)
{
if (ftplib_debug)
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,RESPONSE_BUFSIZ,nControl) == -1)
{
if (ftplib_debug)
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,RESPONSE_BUFSIZ,nControl) == -1)
{
if (ftplib_debug)
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;
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)
pnum = "ftp";
else
*pnum++ = '\0';
if (isdigit(*pnum))
sin.sin_port = htons(atoi(pnum));
else
{
struct servent *pse;
#if _REENTRANT
struct servent se;
char tmpbuf[TMP_BUFSIZ];
int i;
if ( ( i = getservbyname_r(pnum,"tcp",&se,tmpbuf,TMP_BUFSIZ,&pse) ) != 0 )
{
errno = i;
if ( ftplib_debug )
perror("getservbyname_r");
free(lhost);
return 0;
}
#else
if ((pse = getservbyname(pnum,"tcp") ) == NULL )
{
if ( ftplib_debug )
perror("getservbyname");
free(lhost);
return 0;
}
#endif
sin.sin_port = pse->s_port;
}
if ((sin.sin_addr.s_addr = inet_addr(lhost)) == INADDR_NONE)
{
struct hostent *phe;
#ifdef _REENTRANT
struct hostent he;
char tmpbuf[TMP_BUFSIZ];
int i, herr;
if ( ( ( i = gethostbyname_r( lhost, &he, tmpbuf, TMP_BUFSIZ, &phe, &herr ) ) != 0 ) ||
( phe == NULL ) )
{
if ( ftplib_debug )
fprintf(stderr, "gethostbyname: %s\n", hstrerror(herr));
free(lhost);
return 0;
}
#else
if ((phe = gethostbyname(lhost)) == NULL)
{
if (ftplib_debug)
fprintf(stderr, "gethostbyname: %s\n", hstrerror(h_errno));
free(lhost);
return 0;
}
#endif
memcpy((char *)&sin.sin_addr, phe->h_addr, phe->h_length);
}
free(lhost);
sControl = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sControl == -1)
{
if (ftplib_debug)
perror("socket");
return 0;
}
if (setsockopt(sControl,SOL_SOCKET,SO_REUSEADDR,
SETSOCKOPT_OPTVAL_TYPE &on, sizeof(on)) == -1)
{
if (ftplib_debug)
perror("setsockopt");
net_close(sControl);
return 0;
}
if (connect(sControl, (struct sockaddr *)&sin, sizeof(sin)) == -1)
{
if (ftplib_debug)
perror("connect");
net_close(sControl);
return 0;
}
ctrl = calloc(1,sizeof(netbuf));
if (ctrl == NULL)
{
if (ftplib_debug)
perror("calloc");
net_close(sControl);
return 0;
}
ctrl->buf = malloc(FTPLIB_BUFSIZ);
if (ctrl->buf == NULL)
{
if (ftplib_debug)
perror("calloc");
net_close(sControl);
free(ctrl);
return 0;
}
ctrl->handle = sControl;
ctrl->dir = FTPLIB_CONTROL;
ctrl->ctrl = NULL;
ctrl->data = 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;
}
GLOBALDEF int FtpSetCallback(const FtpCallbackOptions *opt, netbuf *nControl)
{
nControl->idlecb = opt->cbFunc;
nControl->idlearg = opt->cbArg;
nControl->idletime.tv_sec = opt->idleTime / 1000;
nControl->idletime.tv_usec = (opt->idleTime % 1000) * 1000;
nControl->cbbytes = opt->bytesXferred;
return 1;
}
GLOBALDEF int FtpClearCallback(netbuf *nControl)
{
nControl->idlecb = NULL;
nControl->idlearg = NULL;
nControl->idletime.tv_sec = 0;
nControl->idletime.tv_usec = 0;
nControl->cbbytes = 0;
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[TMP_BUFSIZ];
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)
{
if (ftplib_debug)
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[TMP_BUFSIZ];
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)
{
if (ftplib_debug)
perror("getsockname");
return -1;
}
}
sData = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
if (sData == -1)
{
if (ftplib_debug)
perror("socket");
return -1;
}
if (setsockopt(sData,SOL_SOCKET,SO_REUSEADDR,
SETSOCKOPT_OPTVAL_TYPE &on,sizeof(on)) == -1)
{
if (ftplib_debug)
perror("setsockopt");
net_close(sData);
return -1;
}
if (setsockopt(sData,SOL_SOCKET,SO_LINGER,
SETSOCKOPT_OPTVAL_TYPE &lng,sizeof(lng)) == -1)
{
if (ftplib_debug)
perror("setsockopt");
net_close(sData);
return -1;
}
if (nControl->cmode == FTPLIB_PASSIVE)
{
if (connect(sData, &sin.sa, sizeof(sin.sa)) == -1)
{
if (ftplib_debug)
perror("connect");
net_close(sData);
return -1;
}
}
else
{
sin.in.sin_port = 0;
if (bind(sData, &sin.sa, sizeof(sin)) == -1)
{
if (ftplib_debug)
perror("bind");
net_close(sData);
return -1;
}
if (listen(sData, 1) < 0)
{
if (ftplib_debug)
perror("listen");
net_close(sData);
return -1;
}
if (getsockname(sData, &sin.sa, &l) < 0)
return -1;
sprintf(buf, "PORT %d,%d,%d,%d,%d,%d",
(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))
{
net_close(sData);
return -1;
}
}
ctrl = calloc(1,sizeof(netbuf));
if (ctrl == NULL)
{
if (ftplib_debug)
perror("calloc");
net_close(sData);
return -1;
}
if ((mode == 'A') && ((ctrl->buf = malloc(FTPLIB_BUFSIZ)) == NULL))
{
if (ftplib_debug)
perror("calloc");
net_close(sData);
free(ctrl);
return -1;
}
ctrl->handle = sData;
ctrl->dir = dir;
ctrl->idletime = nControl->idletime;
ctrl->idlearg = nControl->idlearg;
ctrl->xfered = 0;
ctrl->xfered1 = 0;
ctrl->cbbytes = nControl->cbbytes;
ctrl->ctrl = nControl;
if (ctrl->idletime.tv_sec || ctrl->idletime.tv_usec || ctrl->cbbytes)
ctrl->idlecb = nControl->idlecb;
else
ctrl->idlecb = NULL;
nControl->data = ctrl;
*nData = ctrl;
return 1;
}
/*
* FtpAcceptConnection - accept connection from server
*
* return 1 if successful, 0 otherwise
*/
static int FtpAcceptConnection(netbuf *nData, netbuf *nControl)
{
int sData;
struct sockaddr addr;
unsigned int l;
int i;
struct timeval tv;
fd_set mask;
int rv;
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));
net_close(nData->handle);
nData->handle = 0;
rv = 0;
}
else if (i == 0)
{
strcpy(nControl->response, "timed out waiting for connection");
net_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;
net_close(nData->handle);
if (sData > 0)
{
rv = 1;
nData->handle = sData;
}
else
{
strncpy(nControl->response, strerror(i),
sizeof(nControl->response));
nData->handle = 0;
rv = 0;
}
}
else if (FD_ISSET(nControl->handle, &mask))
{
net_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
*/
GLOBALDEF int FtpAccess(const char *path, int typ, int mode, netbuf *nControl,
netbuf **nData)
{
char buf[TMP_BUFSIZ];
int dir;
if ((path == NULL) &&
((typ == FTPLIB_FILE_WRITE) || (typ == FTPLIB_FILE_READ)))
{
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");
dir = FTPLIB_READ;
break;
case FTPLIB_FILE_READ:
strcpy(buf,"RETR");
dir = FTPLIB_READ;
break;
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 + 1) >= sizeof(buf))
return 0;
strcpy(&buf[i],path);
}
if (FtpOpenPort(nControl, nData, mode, dir) == -1)
return 0;
if (!FtpSendCmd(buf, '1', nControl))
{
FtpClose(*nData);
*nData = NULL;
return 0;
}
if (nControl->cmode == FTPLIB_PORT)
{
if (!FtpAcceptConnection(*nData,nControl))
{
FtpClose(*nData);
*nData = NULL;
nControl->data = NULL;
return 0;
}
}
return 1;
}
/*
* FtpRead - read from a data connection
*/
GLOBALDEF int FtpRead(void *buf, int max, netbuf *nData)
{
int i;
if (nData->dir != FTPLIB_READ)
return 0;
if (nData->buf)
i = readline(buf, max, nData);
else
{
i = socket_wait(nData);
if (i != 1)
return 0;
i = net_read(nData->handle, buf, max);
}
if (i == -1)
return 0;
nData->xfered += i;
if (nData->idlecb && nData->cbbytes)
{
nData->xfered1 += i;
if (nData->xfered1 > nData->cbbytes)