ftp.c

/***************************************************************************
 *                                  _   _ ____  _     
 *  Project                     ___| | | |  _ \| |    
 *                             / __| | | | |_) | |    
 *                            | (__| |_| |  _ <| |___ 
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2003, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 * 
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * $Id$
 ***************************************************************************/

#include "setup.h"

#ifndef CURL_DISABLE_FTP
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <ctype.h>
#include <errno.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif

#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
#include <winsock.h>
#else /* some kind of unix */
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <sys/types.h>
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#include <sys/utsname.h>
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef	VMS
#include <in.h>
#include <inet.h>
#endif
#endif

#if defined(WIN32) && defined(__GNUC__) || defined(__MINGW32__)
#include <errno.h>
#endif

#include <curl/curl.h>
#include "urldata.h"
#include "sendf.h"

#include "if2ip.h"
#include "hostip.h"
#include "progress.h"
#include "transfer.h"
#include "escape.h"
#include "http.h" /* for HTTP proxy tunnel stuff */
#include "ftp.h"

#ifdef KRB4
#include "security.h"
#include "krb4.h"
#endif

#include "strequal.h"
#include "ssluse.h"
#include "connect.h"

#if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
#include "inet_ntoa_r.h"
#endif

#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>

/* The last #include file should be: */
#ifdef MALLOCDEBUG
#include "memdebug.h"
#endif

/* Local API functions */
static CURLcode ftp_sendquote(struct connectdata *conn, struct curl_slist *quote);
static CURLcode ftp_cwd(struct connectdata *conn, char *path);

/* easy-to-use macro: */
#define FTPSENDF(x,y,z) if((result = Curl_ftpsendf(x,y,z))) return result

/***********************************************************************
 *
 * AllowServerConnect()
 *
 * When we've issue the PORT command, we have told the server to connect
 * to us. This function will sit and wait here until the server has
 * connected.
 *
 */
static CURLcode AllowServerConnect(struct SessionHandle *data,
                                   struct connectdata *conn,
                                   int sock)
{
  fd_set rdset;
  struct timeval dt;
  
  FD_ZERO(&rdset);

  FD_SET(sock, &rdset);

  /* we give the server 10 seconds to connect to us */
  dt.tv_sec = 10;
  dt.tv_usec = 0;

  switch (select(sock+1, &rdset, NULL, NULL, &dt)) {
  case -1: /* error */
    /* let's die here */
    failf(data, "Error while waiting for server connect");
    return CURLE_FTP_PORT_FAILED;
  case 0:  /* timeout */
    /* let's die here */
    failf(data, "Timeout while waiting for server connect");
    return CURLE_FTP_PORT_FAILED;
  default:
    /* we have received data here */
    {
      int s;
      size_t size = sizeof(struct sockaddr_in);
      struct sockaddr_in add;

      getsockname(sock, (struct sockaddr *) &add, (socklen_t *)&size);
      s=accept(sock, (struct sockaddr *) &add, (socklen_t *)&size);

      sclose(sock); /* close the first socket */

      if (-1 == s) {
        /* DIE! */
        failf(data, "Error accept()ing server connect");
      	return CURLE_FTP_PORT_FAILED;
      }
      infof(data, "Connection accepted from server\n");

      conn->secondarysocket = s;
    }
    break;
  }
  return CURLE_OK;
}


/* --- parse FTP server responses --- */

/*
 * Curl_GetFTPResponse() is supposed to be invoked after each command sent to
 * a remote FTP server. This function will wait and read all lines of the
 * response and extract the relevant return code for the invoking function.
 */

CURLcode Curl_GetFTPResponse(ssize_t *nreadp, /* return number of bytes read */
                             struct connectdata *conn,
                             int *ftpcode) /* return the ftp-code */
{
  /* Brand new implementation.
   * We cannot read just one byte per read() and then go back to select()
   * as it seems that the OpenSSL read() stuff doesn't grok that properly.
   *
   * Alas, read as much as possible, split up into lines, use the ending
   * line in a response or continue reading.  */

  int sockfd = conn->firstsocket;
  int perline; /* count bytes per line */
  bool keepon=TRUE;
  ssize_t gotbytes;
  char *ptr;
  int timeout;              /* timeout in seconds */
  struct timeval interval;
  fd_set rkeepfd;
  fd_set readfd;
  struct SessionHandle *data = conn->data;
  char *line_start;
  int code=0; /* default ftp "error code" to return */
  char *buf = data->state.buffer;
  CURLcode result = CURLE_OK;
  struct FTP *ftp = conn->proto.ftp;
  struct timeval now = Curl_tvnow();

  if (ftpcode)
    *ftpcode = 0; /* 0 for errors */

  FD_ZERO (&readfd);		/* clear it */
  FD_SET (sockfd, &readfd);     /* read socket */

  /* get this in a backup variable to be able to restore it on each lap in the
     select() loop */
  rkeepfd = readfd;

  ptr=buf;
  line_start = buf;

  *nreadp=0;
  perline=0;
  keepon=TRUE;

  while((*nreadp<BUFSIZE) && (keepon && !result)) {
    /* check and reset timeout value every lap */
    if(data->set.timeout)
      /* if timeout is requested, find out how much remaining time we have */
      timeout = data->set.timeout - /* timeout time */
        Curl_tvdiff(Curl_tvnow(), conn->now)/1000; /* spent time */
    else
      /* Even without a requested timeout, we only wait response_time
         seconds for the full response to arrive before we bail out */
      timeout = ftp->response_time -
        Curl_tvdiff(Curl_tvnow(), now)/1000; /* spent time */

    if(timeout <=0 ) {
      failf(data, "Transfer aborted due to timeout");
      return CURLE_OPERATION_TIMEDOUT; /* already too little time */
    }

    if(!ftp->cache) {
      readfd = rkeepfd;		   /* set every lap */
      interval.tv_sec = timeout;
      interval.tv_usec = 0;

      switch (select (sockfd+1, &readfd, NULL, NULL, &interval)) {
      case -1: /* select() error, stop reading */
        result = CURLE_RECV_ERROR;
        failf(data, "Transfer aborted due to select() error: %d", errno);
        break;
      case 0: /* timeout */
        result = CURLE_OPERATION_TIMEDOUT;
        failf(data, "Transfer aborted due to timeout");
        break;
      default:
        break;
      }
    }
    if(CURLE_OK == result) {
      /*
       * This code previously didn't use the kerberos sec_read() code
       * to read, but when we use Curl_read() it may do so. Do confirm
       * that this is still ok and then remove this comment!
       */
      if(ftp->cache) {
        /* we had data in the "cache", copy that instead of doing an actual
           read */
        memcpy(ptr, ftp->cache, ftp->cache_size);
        gotbytes = ftp->cache_size;
        free(ftp->cache);    /* free the cache */
        ftp->cache = NULL;   /* clear the pointer */
        ftp->cache_size = 0; /* zero the size just in case */
      }
      else {
        int res = Curl_read(conn, sockfd, ptr, BUFSIZE-*nreadp, &gotbytes);
        if(res < 0)
          /* EWOULDBLOCK */
          continue; /* go looping again */

        if(CURLE_OK != res)
          keepon = FALSE;
      }

      if(!keepon)
        ;
      else if(gotbytes <= 0) {
        keepon = FALSE;
        result = CURLE_RECV_ERROR;
        failf(data, "Connection aborted");
      }
      else {
        /* we got a whole chunk of data, which can be anything from one
         * byte to a set of lines and possible just a piece of the last
         * line */
        int i;

        *nreadp += gotbytes;
        for(i = 0; i < gotbytes; ptr++, i++) {
          perline++;
          if(*ptr=='\n') {
            /* a newline is CRLF in ftp-talk, so the CR is ignored as
               the line isn't really terminated until the LF comes */
            CURLcode result;

            /* output debug output if that is requested */
            if(data->set.verbose)
              Curl_debug(data, CURLINFO_HEADER_IN, line_start, perline);

            /*
             * We pass all response-lines to the callback function registered
             * for "headers". The response lines can be seen as a kind of
             * headers.
             */
            result = Curl_client_write(data, CLIENTWRITE_HEADER,
                                       line_start, perline);
            if(result)
              return result;
                                       
#define lastline(line) (isdigit((int)line[0]) && isdigit((int)line[1]) && \
			isdigit((int)line[2]) && (' ' == line[3]))

            if(perline>3 && lastline(line_start)) {
              /* This is the end of the last line, copy the last
               * line to the start of the buffer and zero terminate,
               * for old times sake (and krb4)! */
              char *meow;
              int n;
              for(meow=line_start, n=0; meow<ptr; meow++, n++)
                buf[n] = *meow;
              *meow=0; /* zero terminate */
              keepon=FALSE;
              line_start = ptr+1; /* advance pointer */
              i++; /* skip this before getting out */
              break;
            }
            perline=0; /* line starts over here */
            line_start = ptr+1;
          }
        }
        if(!keepon && (i != gotbytes)) {
          /* We found the end of the response lines, but we didn't parse the
             full chunk of data we have read from the server. We therefore
             need to store the rest of the data to be checked on the next
             invoke as it may actually contain another end of response
             already!  Cleverly figured out by Eric Lavigne in December
             2001. */
          ftp->cache_size = gotbytes - i;
          ftp->cache = (char *)malloc(ftp->cache_size);
          if(ftp->cache)
            memcpy(ftp->cache, line_start, ftp->cache_size);
          else
            return CURLE_OUT_OF_MEMORY; /**BANG**/
        }
      } /* there was data */
    } /* if(no error) */
  } /* while there's buffer left and loop is requested */

  if(!result)
    code = atoi(buf);

#ifdef KRB4
  /* handle the security-oriented responses 6xx ***/
  /* FIXME: some errorchecking perhaps... ***/
  switch(code) {
  case 631:
    Curl_sec_read_msg(conn, buf, prot_safe);
    break;
  case 632:
    Curl_sec_read_msg(conn, buf, prot_private);
    break;
  case 633:
    Curl_sec_read_msg(conn, buf, prot_confidential);
    break;
  default:
    /* normal ftp stuff we pass through! */
    break;
  }
#endif

  if(ftpcode)
    *ftpcode=code; /* return the initial number like this */

  return result;
}

/*
 * Curl_ftp_connect() should do everything that is to be considered a part of
 * the connection phase.
 */
CURLcode Curl_ftp_connect(struct connectdata *conn)
{
  /* this is FTP and no proxy */
  ssize_t nread;
  struct SessionHandle *data=conn->data;
  char *buf = data->state.buffer; /* this is our buffer */
  struct FTP *ftp;
  CURLcode result;
  int ftpcode;

  ftp = (struct FTP *)malloc(sizeof(struct FTP));
  if(!ftp)
    return CURLE_OUT_OF_MEMORY;

  memset(ftp, 0, sizeof(struct FTP));
  conn->proto.ftp = ftp;

  /* We always support persistant connections on ftp */
  conn->bits.close = FALSE;

  /* get some initial data into the ftp struct */
  ftp->bytecountp = &conn->bytecount;

  /* no need to duplicate them, the data struct won't change */
  ftp->user = data->state.user;
  ftp->passwd = data->state.passwd;
  ftp->response_time = 3600; /* set default response time-out */

  if (data->set.tunnel_thru_httpproxy) {
    /* We want "seamless" FTP operations through HTTP proxy tunnel */
    result = Curl_ConnectHTTPProxyTunnel(conn, conn->firstsocket,
                                         conn->hostname, conn->remote_port);
    if(CURLE_OK != result)
      return result;
  }

  if(conn->protocol & PROT_FTPS) {
    /* FTPS is simply ftp with SSL for the control channel */
    /* now, perform the SSL initialization for this socket */
    result = Curl_SSLConnect(conn);
    if(result)
      return result;
  }


  /* The first thing we do is wait for the "220*" line: */
  result = Curl_GetFTPResponse(&nread, conn, &ftpcode);
  if(result)
    return result;

  if(ftpcode != 220) {
    failf(data, "This doesn't seem like a nice ftp-server response");
    return CURLE_FTP_WEIRD_SERVER_REPLY;
  }

#ifdef KRB4
  /* if not anonymous login, try a secure login */
  if(data->set.krb4) {

    /* request data protection level (default is 'clear') */
    Curl_sec_request_prot(conn, "private");

    /* We set private first as default, in case the line below fails to
       set a valid level */
    Curl_sec_request_prot(conn, data->set.krb4_level);

    if(Curl_sec_login(conn) != 0)
      infof(data, "Logging in with password in cleartext!\n");
    else
      infof(data, "Authentication successful\n");
  }
#endif
  
  /* send USER */
  FTPSENDF(conn, "USER %s", ftp->user);

  /* wait for feedback */
  result = Curl_GetFTPResponse(&nread, conn, &ftpcode);
  if(result)
    return result;

  if(ftpcode == 530) {
    /* 530 User ... access denied
       (the server denies to log the specified user) */
    failf(data, "Access denied: %s", &buf[4]);
    return CURLE_FTP_ACCESS_DENIED;
  }
  else if(ftpcode == 331) {
    /* 331 Password required for ...
       (the server requires to send the user's password too) */
    FTPSENDF(conn, "PASS %s", ftp->passwd);
    result = Curl_GetFTPResponse(&nread, conn, &ftpcode);
    if(result)
      return result;

    if(ftpcode == 530) {
      /* 530 Login incorrect.
         (the username and/or the password are incorrect) */
      failf(data, "the username and/or the password are incorrect");
      return CURLE_FTP_USER_PASSWORD_INCORRECT;
    }
    else if(ftpcode == 230) {
      /* 230 User ... logged in.
         (user successfully logged in) */
        
      infof(data, "We have successfully logged in\n");
    }
    else {
      failf(data, "Odd return code after PASS");
      return CURLE_FTP_WEIRD_PASS_REPLY;
    }
  }
  else if(buf[0] == '2') {
    /* 230 User ... logged in.
       (the user logged in without password) */
    infof(data, "We have successfully logged in\n");
#ifdef KRB4
	/* we are logged in (with Kerberos)
	 * now set the requested protection level
	 */
    if(conn->sec_complete)
      Curl_sec_set_protection_level(conn);

    /* we may need to issue a KAUTH here to have access to the files
     * do it if user supplied a password
     */
    if(data->state.passwd && *data->state.passwd) {
      result = Curl_krb_kauth(conn);
      if(result)
        return result;
    }
#endif
  }
  else {
    failf(data, "Odd return code after USER");
    return CURLE_FTP_WEIRD_USER_REPLY;
  }

  /* send PWD to discover our entry point */
  FTPSENDF(conn, "PWD", NULL);

  /* wait for feedback */
  result = Curl_GetFTPResponse(&nread, conn, &ftpcode);
  if(result)
    return result;

  if(ftpcode == 257) {
    char *dir = (char *)malloc(nread+1);
    char *store=dir;
    char *ptr=&buf[4]; /* start on the first letter */
    
    /* Reply format is like
       257<space>"<directory-name>"<space><commentary> and the RFC959 says

       The directory name can contain any character; embedded double-quotes
       should be escaped by double-quotes (the "quote-doubling" convention).
    */
    if(dir && ('\"' == *ptr)) {
      /* it started good */
      ptr++;
      while(ptr && *ptr) {
        if('\"' == *ptr) {
          if('\"' == ptr[1]) {
            /* "quote-doubling" */
            *store = ptr[1];
            ptr++;
          }
          else {
            /* end of path */
            *store = '\0'; /* zero terminate */
            break; /* get out of this loop */
          }
        }
        else
          *store = *ptr;
        store++;
        ptr++;
      }
      ftp->entrypath =dir; /* remember this */
      infof(data, "Entry path is '%s'\n", ftp->entrypath);
    }
    else {
      /* couldn't get the path */
      free(dir);
      infof(data, "Failed to figure out path\n");
    }

  }
  else {
    /* We couldn't read the PWD response! */
  }

  return CURLE_OK;
}

/***********************************************************************
 *
 * Curl_ftp_done()
 *
 * The DONE function. This does what needs to be done after a single DO has
 * performed.
 *
 * Input argument is already checked for validity.
 */
CURLcode Curl_ftp_done(struct connectdata *conn)
{
  struct SessionHandle *data = conn->data;
  struct FTP *ftp = conn->proto.ftp;
  ssize_t nread;
  int ftpcode;
  CURLcode result=CURLE_OK;

  if(data->set.upload) {
    if((-1 != data->set.infilesize) &&
       (data->set.infilesize != *ftp->bytecountp) &&
       !data->set.crlf) {
      failf(data, "Uploaded unaligned file size (%d out of %d bytes)",
            *ftp->bytecountp, data->set.infilesize);
      return CURLE_PARTIAL_FILE;
    }
  }
  else {
    if((-1 != conn->size) && (conn->size != *ftp->bytecountp) &&
       (conn->maxdownload != *ftp->bytecountp)) {
      failf(data, "Received only partial file: %d bytes", *ftp->bytecountp);
      return CURLE_PARTIAL_FILE;
    }
    else if(!ftp->dont_check &&
            !*ftp->bytecountp &&
            (conn->size>0)) {
      /* We consider this an error, but there's no true FTP error received
         why we need to continue to "read out" the server response too.
         We don't want to leave a "waiting" server reply if we'll get told
         to make a second request on this same connection! */
      failf(data, "No data was received!");
      result = CURLE_FTP_COULDNT_RETR_FILE;
    }
  }

#ifdef KRB4
  Curl_sec_fflush_fd(conn, conn->secondarysocket);
#endif
  /* shut down the socket to inform the server we're done */
  sclose(conn->secondarysocket);
  conn->secondarysocket = -1;

  if(!ftp->no_transfer) {
    /* Let's see what the server says about the transfer we just performed,
       but lower the timeout as sometimes this connection has died while 
       the data has been transfered. This happens when doing through NATs
       etc that abandon old silent connections.
    */
    ftp->response_time = 60; /* give it only a minute for now */

    result = Curl_GetFTPResponse(&nread, conn, &ftpcode);

    ftp->response_time = 3600; /* set this back to one hour waits */
  
    if(!nread && (CURLE_OPERATION_TIMEDOUT == result)) {
      failf(data, "control connection looks dead");
      return result;
    }

    if(result)
      return result;

    if(!ftp->dont_check) {
      /* 226 Transfer complete, 250 Requested file action okay, completed. */
      if((ftpcode != 226) && (ftpcode != 250)) {
        failf(data, "server did not report OK, got %d", ftpcode);
        return CURLE_FTP_WRITE_ERROR;
      }
    }
  }

  /* clear these for next connection */
  ftp->no_transfer = FALSE;
  ftp->dont_check = FALSE; 

  /* Send any post-transfer QUOTE strings? */
  if(!result && data->set.postquote)
    result = ftp_sendquote(conn, data->set.postquote);

  return result;
}

/***********************************************************************
 *
 * ftp_sendquote()
 *
 * Where a 'quote' means a list of custom commands to send to the server.
 * The quote list is passed as an argument.
 */

static 
CURLcode ftp_sendquote(struct connectdata *conn, struct curl_slist *quote)
{
  struct curl_slist *item;
  ssize_t nread;
  int ftpcode;
  CURLcode result;

  item = quote;
  while (item) {
    if (item->data) {
      FTPSENDF(conn, "%s", item->data);

      result = Curl_GetFTPResponse(&nread, conn, &ftpcode);
      if (result)
        return result;

      if (ftpcode >= 400) {
        failf(conn->data, "QUOT string not accepted: %s", item->data);
        return CURLE_FTP_QUOTE_ERROR;
      }
    }

    item = item->next;
  }

  return CURLE_OK;
}

/***********************************************************************
 *
 * ftp_cwd()
 *
 * Send 'CWD' to the remote server to Change Working Directory.
 * It is the ftp version of the unix 'cd' command.
 */
static 
CURLcode ftp_cwd(struct connectdata *conn, char *path)
{
  ssize_t nread;
  int     ftpcode;
  CURLcode result;
  
  FTPSENDF(conn, "CWD %s", path);
  result = Curl_GetFTPResponse(&nread, conn, &ftpcode);
  if (result)
    return result;

  /* According to RFC959, CWD is supposed to return 250 on success, but
     there seem to be non-compliant FTP servers out there that return 200,
     so we accept any '2xy' code here. */
  if (ftpcode/100 != 2) {
    failf(conn->data, "Couldn't cd to %s", path);
    return CURLE_FTP_ACCESS_DENIED;
  }

  return CURLE_OK;
}

/***********************************************************************
 *
 * ftp_getfiletime()
 *
 * Get the timestamp of the given file.
 */
static
CURLcode ftp_getfiletime(struct connectdata *conn, char *file)
{
  CURLcode result=CURLE_OK;
  int ftpcode; /* for ftp status */
  ssize_t nread;
  char *buf = conn->data->state.buffer;

  /* we have requested to get the modified-time of the file, this is yet
     again a grey area as the MDTM is not kosher RFC959 */
  FTPSENDF(conn, "MDTM %s", file);

  result = Curl_GetFTPResponse(&nread, conn, &ftpcode);
  if(result)
    return result;

  switch(ftpcode) {
  case 213:
    {
      /* we got a time. Format should be: "YYYYMMDDHHMMSS[.sss]" where the
         last .sss part is optional and means fractions of a second */
      int year, month, day, hour, minute, second;
      if(6 == sscanf(buf+4, "%04d%02d%02d%02d%02d%02d",
                     &year, &month, &day, &hour, &minute, &second)) {
        /* we have a time, reformat it */
        time_t secs=time(NULL);
        sprintf(buf, "%04d%02d%02d %02d:%02d:%02d",
                year, month, day, hour, minute, second);
        /* now, convert this into a time() value: */
        conn->data->info.filetime = curl_getdate(buf, &secs);
      }
    }
    break;
  default:
    infof(conn->data, "unsupported MDTM reply format\n");
    break;
  case 550: /* "No such file or directory" */
    failf(conn->data, "Given file does not exist");
    result = CURLE_FTP_COULDNT_RETR_FILE;
    break;
  }
  return  result;
}

/***********************************************************************
 *
 * ftp_transfertype()
 *
 * Set transfer type. We only deal with ASCII or BINARY so this function
 * sets one of them.
 */
static CURLcode ftp_transfertype(struct connectdata *conn,
                                  bool ascii)
{
  struct SessionHandle *data = conn->data;
  int ftpcode;
  ssize_t nread;
  CURLcode result;

  FTPSENDF(conn, "TYPE %s", ascii?"A":"I");

  result = Curl_GetFTPResponse(&nread, conn, &ftpcode);
  if(result)
    return result;
  
  if(ftpcode != 200) {
    failf(data, "Couldn't set %s mode",
          ascii?"ASCII":"binary");
    return ascii? CURLE_FTP_COULDNT_SET_ASCII:CURLE_FTP_COULDNT_SET_BINARY;
  }

  return CURLE_OK;
}

/***********************************************************************
 *
 * ftp_getsize()
 *
 * Returns the file size (in bytes) of the given remote file.
 */

static
CURLcode ftp_getsize(struct connectdata *conn, char *file,
                      ssize_t *size)
{
  struct SessionHandle *data = conn->data;
  int ftpcode;
  ssize_t nread;
  char *buf=data->state.buffer;
  CURLcode result;

  FTPSENDF(conn, "SIZE %s", file);
  result = Curl_GetFTPResponse(&nread, conn, &ftpcode);
  if(result)
    return result;

  if(ftpcode == 213) {
    /* get the size from the ascii string: */
    *size = atoi(buf+4);
  }
  else
    return CURLE_FTP_COULDNT_GET_SIZE;

  return CURLE_OK;
}

/***************************************************************************
 *
 * ftp_pasv_verbose()
 *
 * This function only outputs some informationals about this second connection
 * when we've issued a PASV command before and thus we have connected to a
 * possibly new IP address.
 *
 */
static void
ftp_pasv_verbose(struct connectdata *conn,
                 Curl_ipconnect *addr,
                 char *newhost, /* ascii version */
                 int port)
{
#ifndef ENABLE_IPV6
  /*****************************************************************
   *
   * IPv4-only code section
   */

  struct in_addr in;
  struct hostent * answer;

#ifdef HAVE_INET_NTOA_R
  char ntoa_buf[64];
#endif
  /* The array size trick below is to make this a large chunk of memory
     suitably 8-byte aligned on 64-bit platforms. This was thoughtfully
     suggested by Philip Gladstone. */
  long bigbuf[9000 / sizeof(long)];

#if defined(HAVE_INET_ADDR)
  in_addr_t address;
# if defined(HAVE_GETHOSTBYADDR_R)
  int h_errnop;
# endif
  char *hostent_buf = (char *)bigbuf; /* get a char * to the buffer */

  address = inet_addr(newhost);
# ifdef HAVE_GETHOSTBYADDR_R

#  ifdef HAVE_GETHOSTBYADDR_R_5
  /* AIX, Digital Unix (OSF1, Tru64) style:
     extern int gethostbyaddr_r(char *addr, size_t len, int type,
     struct hostent *htent, struct hostent_data *ht_data); */

  /* Fred Noz helped me try this out, now it at least compiles! */

  /* Bjorn Reese (November 28 2001):
     The Tru64 man page on gethostbyaddr_r() says that
     the hostent struct must be filled with zeroes before the call to
     gethostbyaddr_r(). 

     ... as must be struct hostent_data Craig Markwardt 19 Sep 2002. */

  memset(hostent_buf, 0, sizeof(struct hostent)+sizeof(struct hostent_data));

  if(gethostbyaddr_r((char *) &address,
                     sizeof(address), AF_INET,
                     (struct hostent *)hostent_buf,
                     (struct hostent_data *)(hostent_buf + sizeof(*answer))))
    answer=NULL;
  else
    answer=(struct hostent *)hostent_buf;
                           
#  endif
#  ifdef HAVE_GETHOSTBYADDR_R_7
  /* Solaris and IRIX */
  answer = gethostbyaddr_r((char *) &address, sizeof(address), AF_INET,
                           (struct hostent *)bigbuf,
                           hostent_buf + sizeof(*answer),
                           sizeof(bigbuf) - sizeof(*answer),
                           &h_errnop);
#  endif
#  ifdef HAVE_GETHOSTBYADDR_R_8
  /* Linux style */
  if(gethostbyaddr_r((char *) &address, sizeof(address), AF_INET,
                     (struct hostent *)hostent_buf,
                     hostent_buf + sizeof(*answer),
                     sizeof(bigbuf) - sizeof(*answer),
                     &answer,
                     &h_errnop))
    answer=NULL; /* error */
#  endif
        
# else
  (void)hostent_buf; /* avoid compiler warning */
  answer = gethostbyaddr((char *) &address, sizeof(address), AF_INET);
# endif
#else
  answer = NULL;
#endif
  (void) memcpy(&in.s_addr, addr, sizeof (Curl_ipconnect));
  infof(conn->data, "Connecting to %s (%s) port %u\n",
        answer?answer->h_name:newhost,
#if defined(HAVE_INET_NTOA_R)
        inet_ntoa_r(in, ntoa_buf, sizeof(ntoa_buf)),
#else
        inet_ntoa(in),
#endif
        port);

#else
  /*****************************************************************
   *
   * IPv6-only code section
   */
  char hbuf[NI_MAXHOST]; /* ~1KB */
  char nbuf[NI_MAXHOST]; /* ~1KB */
  char sbuf[NI_MAXSERV]; /* around 32 */
#ifdef NI_WITHSCOPEID
  const int niflags = NI_NUMERICHOST | NI_NUMERICSERV | NI_WITHSCOPEID;
#else
  const int niflags = NI_NUMERICHOST | NI_NUMERICSERV;
#endif
  (void)port; /* prevent compiler warning */
  if (getnameinfo(addr->ai_addr, addr->ai_addrlen,
                  nbuf, sizeof(nbuf), sbuf, sizeof(sbuf), niflags)) {
    snprintf(nbuf, sizeof(nbuf), "?");
    snprintf(sbuf, sizeof(sbuf), "?");
  }
        
  if (getnameinfo(addr->ai_addr, addr->ai_addrlen,
                  hbuf, sizeof(hbuf), NULL, 0, 0)) {
    infof(conn->data, "Connecting to %s (%s) port %s\n", nbuf, newhost, sbuf);
  }
  else {
    infof(conn->data, "Connecting to %s (%s) port %s\n", hbuf, nbuf, sbuf);
  }
#endif
}

/***********************************************************************
 *
 * ftp_use_port()
 *
 * Send the proper PORT command. PORT is the ftp client's way of telling the
 * server that *WE* open a port that we listen on an awaits the server to
 * connect to. This is the opposite of PASV.
 */

static
CURLcode ftp_use_port(struct connectdata *conn)
{
  struct SessionHandle *data=conn->data;
  int portsock=-1;
  ssize_t nread;
  int ftpcode; /* receive FTP response codes in this */