ftp.c

        /* we have a time, reformat it */
        time_t secs=time(NULL);
        /* using the good old yacc/bison yuck */
        snprintf(buf, sizeof(conn->data->state.buffer),
                 "%04d%02d%02d %02d:%02d:%02d GMT",
                 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,
                     curl_off_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 = curlx_strtoofft(buf+4, NULL, 0);
  }
  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_addrinfo *ai,
                 char *newhost, /* ascii version */
                 int port)
{
  char buf[256];
  Curl_printable_address(ai, buf, sizeof(buf));
  infof(conn->data, "Connecting to %s (%s) port %d\n", newhost, buf, port);
}

/***********************************************************************
 *
 * 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;
  curl_socket_t portsock= CURL_SOCKET_BAD;
  ssize_t nread;
  int ftpcode; /* receive FTP response codes in this */
  CURLcode result;

#ifdef ENABLE_IPV6
  /******************************************************************
   *
   * Here's a piece of IPv6-specific code coming up
   *
   */

  struct addrinfo hints, *res, *ai;
  struct sockaddr_storage ss;
  socklen_t sslen;
  char hbuf[NI_MAXHOST]="";
  struct sockaddr *sa=(struct sockaddr *)&ss;
  unsigned char *ap;
  unsigned char *pp;
  char portmsgbuf[1024], tmp[1024];
  enum ftpcommand { EPRT, LPRT, PORT, DONE } fcmd;
  const char *mode[] = { "EPRT", "LPRT", "PORT", NULL };
  int rc;
  int error;
  char *host=NULL;
  struct Curl_dns_entry *h=NULL;

  if(data->set.ftpport && (strlen(data->set.ftpport) > 1)) {
    /* attempt to get the address of the given interface name */
    if(!Curl_if2ip(data->set.ftpport, hbuf, sizeof(hbuf)))
      /* not an interface, use the given string as host name instead */
      host = data->set.ftpport;
    else
      host = hbuf; /* use the hbuf for host name */
  } /* data->set.ftpport */

  if(!host) {
    /* not an interface and not a host name, get default by extracting
       the IP from the control connection */

    sslen = sizeof(ss);
    rc = getsockname(conn->sock[FIRSTSOCKET], (struct sockaddr *)&ss, &sslen);
    if(rc < 0) {
      failf(data, "getsockname() returned %d\n", rc);
      return CURLE_FTP_PORT_FAILED;
    }

    rc = getnameinfo((struct sockaddr *)&ss, sslen, hbuf, sizeof(hbuf), NULL,
                     0, NIFLAGS);
    if(rc) {
      failf(data, "getnameinfo() returned %d\n", rc);
      return CURLE_FTP_PORT_FAILED;
    }
    host = hbuf; /* use this host name */
  }

  rc = Curl_resolv(conn, host, 0, &h);
  if(rc == CURLRESOLV_PENDING)
    rc = Curl_wait_for_resolv(conn, &h);
  if(h) {
    res = h->addr;
    /* when we return from this function, we can forget about this entry
       to we can unlock it now already */
    Curl_resolv_unlock(data, h);
  } /* (h) */
  else
    res = NULL; /* failure! */

  portsock = CURL_SOCKET_BAD;
  error = 0;
  for (ai = res; ai; ai = ai->ai_next) {
    /*
     * Workaround for AIX5 getaddrinfo() problem (it doesn't set ai_socktype):
     */
    if (ai->ai_socktype == 0)
      ai->ai_socktype = hints.ai_socktype;

    portsock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
    if (portsock == CURL_SOCKET_BAD) {
      error = Curl_ourerrno();
      continue;
    }
    if (bind(portsock, ai->ai_addr, ai->ai_addrlen) < 0) {
      error = Curl_ourerrno();
      sclose(portsock);
      portsock = CURL_SOCKET_BAD;
      continue;
    }

    if (listen(portsock, 1) < 0) {
      error = Curl_ourerrno();
      sclose(portsock);
      portsock = CURL_SOCKET_BAD;
      continue;
    }

    break;
  }

  if (portsock == CURL_SOCKET_BAD) {
    failf(data, "%s", Curl_strerror(conn,error));
    return CURLE_FTP_PORT_FAILED;
  }

  sslen = sizeof(ss);
  if (getsockname(portsock, sa, &sslen) < 0) {
    failf(data, "%s", Curl_strerror(conn,Curl_ourerrno()));
    return CURLE_FTP_PORT_FAILED;
  }

#ifdef PF_INET6
  if(!conn->bits.ftp_use_eprt && conn->bits.ipv6)
    /* EPRT is disabled but we are connected to a IPv6 host, so we ignore the
       request and enable EPRT again! */
    conn->bits.ftp_use_eprt = TRUE;
#endif

  for (fcmd = EPRT; fcmd != DONE; fcmd++) {
    int lprtaf, eprtaf;
    int alen=0, plen=0;

    if(!conn->bits.ftp_use_eprt && (EPRT == fcmd))
      /* if disabled, goto next */
      continue;

    if(!conn->bits.ftp_use_lprt && (LPRT == fcmd))
      /* if disabled, goto next */
      continue;

    switch (sa->sa_family) {
    case AF_INET:
      ap = (unsigned char *)&((struct sockaddr_in *)&ss)->sin_addr;
      alen = sizeof(((struct sockaddr_in *)&ss)->sin_addr);
      pp = (unsigned char *)&((struct sockaddr_in *)&ss)->sin_port;
      plen = sizeof(((struct sockaddr_in *)&ss)->sin_port);
      lprtaf = 4;
      eprtaf = 1;
      break;
    case AF_INET6:
      ap = (unsigned char *)&((struct sockaddr_in6 *)&ss)->sin6_addr;
      alen = sizeof(((struct sockaddr_in6 *)&ss)->sin6_addr);
      pp = (unsigned char *)&((struct sockaddr_in6 *)&ss)->sin6_port;
      plen = sizeof(((struct sockaddr_in6 *)&ss)->sin6_port);
      lprtaf = 6;
      eprtaf = 2;
      break;
    default:
      ap = pp = NULL;
      lprtaf = eprtaf = -1;
      break;
    }

    if (EPRT == fcmd) {
      if (eprtaf < 0)
        continue;
      if (getnameinfo((struct sockaddr *)&ss, sslen,
                      portmsgbuf, sizeof(portmsgbuf), tmp, sizeof(tmp),
                      NIFLAGS))
        continue;

      /* do not transmit IPv6 scope identifier to the wire */
      if (sa->sa_family == AF_INET6) {
        char *q = strchr(portmsgbuf, '%');
        if (q)
          *q = '\0';
      }

      result = Curl_ftpsendf(conn, "%s |%d|%s|%s|", mode[fcmd], eprtaf,
                             portmsgbuf, tmp);
      if(result)
        return result;
    }
    else if ((LPRT == fcmd) || (PORT == fcmd)) {
      int i;

      if ((LPRT == fcmd) && lprtaf < 0)
        continue;
      if ((PORT == fcmd) && sa->sa_family != AF_INET)
        continue;

      portmsgbuf[0] = '\0';
      if (LPRT == fcmd) {
        snprintf(tmp, sizeof(tmp), "%d,%d", lprtaf, alen);
        if (strlcat(portmsgbuf, tmp, sizeof(portmsgbuf)) >=
            sizeof(portmsgbuf)) {
          continue;
        }
      }

      for (i = 0; i < alen; i++) {
        if (portmsgbuf[0])
          snprintf(tmp, sizeof(tmp), ",%u", ap[i]);
        else
          snprintf(tmp, sizeof(tmp), "%u", ap[i]);

        if (strlcat(portmsgbuf, tmp, sizeof(portmsgbuf)) >=
            sizeof(portmsgbuf)) {
          continue;
        }
      }

      if (LPRT == fcmd) {
        snprintf(tmp, sizeof(tmp), ",%d", plen);

        if (strlcat(portmsgbuf, tmp, sizeof(portmsgbuf)) >= sizeof(portmsgbuf))
          continue;
      }

      for (i = 0; i < plen; i++) {
        snprintf(tmp, sizeof(tmp), ",%u", pp[i]);

        if (strlcat(portmsgbuf, tmp, sizeof(portmsgbuf)) >=
            sizeof(portmsgbuf)) {
          continue;
        }
      }

      result = Curl_ftpsendf(conn, "%s %s", mode[fcmd], portmsgbuf);
      if(result)
        return result;
    }

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

    if (ftpcode != 200) {
      if (EPRT == fcmd) {
        infof(data, "disabling EPRT usage\n");
        conn->bits.ftp_use_eprt = FALSE;
      }
      else if (LPRT == fcmd) {
        infof(data, "disabling LPRT usage\n");
        conn->bits.ftp_use_lprt = FALSE;
      }
      continue;
    }
    else
      break;
  }

  if (fcmd == DONE) {
    sclose(portsock);
    failf(data, "PORT command attempts failed");
    return CURLE_FTP_PORT_FAILED;
  }
  /* we set the secondary socket variable to this for now, it
     is only so that the cleanup function will close it in case
     we fail before the true secondary stuff is made */
  conn->sock[SECONDARYSOCKET] = portsock;

#else
  /******************************************************************
   *
   * Here's a piece of IPv4-specific code coming up
   *
   */
  struct sockaddr_in sa;
  unsigned short porttouse;
  char myhost[256] = "";
  bool sa_filled_in = FALSE;
  Curl_addrinfo *addr = NULL;
  unsigned short ip[4];

  if(data->set.ftpport) {
    in_addr_t in;

    /* First check if the given name is an IP address */
    in=inet_addr(data->set.ftpport);

    if(in != CURL_INADDR_NONE)
      /* this is an IPv4 address */
      addr = Curl_ip2addr(in, data->set.ftpport, 0);
    else {
      if(Curl_if2ip(data->set.ftpport, myhost, sizeof(myhost))) {
        /* The interface to IP conversion provided a dotted address */
        in=inet_addr(myhost);
        addr = Curl_ip2addr(in, myhost, 0);
      }
      else if(strlen(data->set.ftpport)> 1) {
        /* might be a host name! */
        struct Curl_dns_entry *h=NULL;
        int rc = Curl_resolv(conn, myhost, 0, &h);
        if(rc == CURLRESOLV_PENDING)
          rc = Curl_wait_for_resolv(conn, &h);
        if(h) {
          addr = h->addr;
          /* when we return from this function, we can forget about this entry
             to we can unlock it now already */
          Curl_resolv_unlock(data, h);
        } /* (h) */
      } /* strlen */
    } /* CURL_INADDR_NONE */
  } /* data->set.ftpport */

  if(!addr) {
    /* pick a suitable default here */

    socklen_t sslen;

    sslen = sizeof(sa);
    if (getsockname(conn->sock[FIRSTSOCKET],
                    (struct sockaddr *)&sa, &sslen) < 0) {
      failf(data, "getsockname() failed");
      return CURLE_FTP_PORT_FAILED;
    }

    sa_filled_in = TRUE; /* the sa struct is filled in */
  }

  if (addr || sa_filled_in) {
    portsock = socket(AF_INET, SOCK_STREAM, 0);
    if(CURL_SOCKET_BAD != portsock) {
      socklen_t size;

      /* we set the secondary socket variable to this for now, it
         is only so that the cleanup function will close it in case
         we fail before the true secondary stuff is made */
      conn->sock[SECONDARYSOCKET] = portsock;

      if(!sa_filled_in) {
        memcpy(&sa, addr->ai_addr, sizeof(sa));
        sa.sin_addr.s_addr = INADDR_ANY;
      }

      sa.sin_port = 0;
      size = sizeof(sa);

      if(bind(portsock, (struct sockaddr *)&sa, size) >= 0) {
        /* we succeeded to bind */
        struct sockaddr_in add;
        socklen_t socksize = sizeof(add);

        if(getsockname(portsock, (struct sockaddr *) &add,
                       &socksize)<0) {
          failf(data, "getsockname() failed");
          return CURLE_FTP_PORT_FAILED;
        }
        porttouse = ntohs(add.sin_port);

        if ( listen(portsock, 1) < 0 ) {
          failf(data, "listen(2) failed on socket");
          return CURLE_FTP_PORT_FAILED;
        }
      }
      else {
        failf(data, "bind(2) failed on socket");
        return CURLE_FTP_PORT_FAILED;
      }
    }
    else {
      failf(data, "socket(2) failed (%s)");
      return CURLE_FTP_PORT_FAILED;
    }
  }
  else {
    failf(data, "could't find IP address to use");
    return CURLE_FTP_PORT_FAILED;
  }

  if(sa_filled_in)
    Curl_inet_ntop(AF_INET, &((struct sockaddr_in *)&sa)->sin_addr,
                   myhost, sizeof(myhost));
  else
    Curl_printable_address(addr, myhost, sizeof(myhost));

  if(4 == sscanf(myhost, "%hu.%hu.%hu.%hu",
                 &ip[0], &ip[1], &ip[2], &ip[3])) {

    infof(data, "Telling server to connect to %d.%d.%d.%d:%d\n",
          ip[0], ip[1], ip[2], ip[3], porttouse);

    result=Curl_ftpsendf(conn, "PORT %d,%d,%d,%d,%d,%d",
                         ip[0], ip[1], ip[2], ip[3],
                         porttouse >> 8,
                         porttouse & 255);
    if(result)
      return result;

  }
  else
    return CURLE_FTP_PORT_FAILED;

  Curl_freeaddrinfo(addr);

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

  if(ftpcode != 200) {
    failf(data, "Server does not grok PORT, try without it!");
    return CURLE_FTP_PORT_FAILED;
  }
#endif /* end of ipv4-specific code */

  return CURLE_OK;
}

/***********************************************************************
 *
 * ftp_use_pasv()
 *
 * Send the PASV command. PASV is the ftp client's way of asking the server to
 * open a second port that we can connect to (for the data transfer). This is
 * the opposite of PORT.
 */

static
CURLcode ftp_use_pasv(struct connectdata *conn,
                      bool *connected)
{
  struct SessionHandle *data = conn->data;
  ssize_t nread;
  char *buf = data->state.buffer; /* this is our buffer */
  int ftpcode; /* receive FTP response codes in this */
  CURLcode result;
  struct Curl_dns_entry *addr=NULL;
  Curl_addrinfo *conninfo;
  int rc;

  /*
    Here's the excecutive summary on what to do:

    PASV is RFC959, expect:
    227 Entering Passive Mode (a1,a2,a3,a4,p1,p2)

    LPSV is RFC1639, expect:
    228 Entering Long Passive Mode (4,4,a1,a2,a3,a4,2,p1,p2)

    EPSV is RFC2428, expect:
    229 Entering Extended Passive Mode (|||port|)

  */

  const char *mode[] = { "EPSV", "PASV", NULL };
  int results[] = { 229, 227, 0 };
  int modeoff;
  unsigned short connectport; /* the local port connect() should use! */
  unsigned short newport=0; /* remote port, not necessary the local one */

  /* newhost must be able to hold a full IP-style address in ASCII, which
     in the IPv6 case means 5*8-1 = 39 letters */
#define NEWHOST_BUFSIZE 48
  char newhost[NEWHOST_BUFSIZE];

#ifdef PF_INET6
  if(!conn->bits.ftp_use_epsv && conn->bits.ipv6)
    /* EPSV is disabled but we are connected to a IPv6 host, so we ignore the
       request and enable EPSV again! */
    conn->bits.ftp_use_epsv = TRUE;
#endif

  for (modeoff = (conn->bits.ftp_use_epsv?0:1);
       mode[modeoff]; modeoff++) {
    result = Curl_ftpsendf(conn, "%s", mode[modeoff]);
    if(result)
      return result;
    result = Curl_GetFTPResponse(&nread, conn, &ftpcode);
    if(result)
      return result;
    if (ftpcode == results[modeoff])
      break;

    if(modeoff == 0) {
      /* EPSV is not supported, disable it for next transfer */
      conn->bits.ftp_use_epsv = FALSE;
      infof(data, "disabling EPSV usage\n");
    }
  }

  if (!mode[modeoff]) {
    failf(data, "Odd return code after PASV");
    return CURLE_FTP_WEIRD_PASV_REPLY;
  }
  else if (227 == results[modeoff]) {
    int ip[4];
    int port[2];
    char *str=buf;

    /*
     * New 227-parser June 3rd 1999.
     * It now scans for a sequence of six comma-separated numbers and
     * will take them as IP+port indicators.
     *
     * Found reply-strings include:
     * "227 Entering Passive Mode (127,0,0,1,4,51)"
     * "227 Data transfer will passively listen to 127,0,0,1,4,51"
     * "227 Entering passive mode. 127,0,0,1,4,51"
     */

    while(*str) {
      if (6 == sscanf(str, "%d,%d,%d,%d,%d,%d",
                      &ip[0], &ip[1], &ip[2], &ip[3],
                      &port[0], &port[1]))
        break;
      str++;
    }

    if(!*str) {
      failf(data, "Couldn't interpret the 227-reply");
      return CURLE_FTP_WEIRD_227_FORMAT;
    }

    snprintf(newhost, sizeof(newhost),
             "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
    newport = (port[0]<<8) + port[1];
  }
  else if (229 == results[modeoff]) {
    char *ptr = strchr(buf, '(');
    if(ptr) {
      unsigned int num;
      char separator[4];
      ptr++;
      if(5  == sscanf(ptr, "%c%c%c%u%c",
                      &separator[0],
                      &separator[1],
                      &separator[2],
                      &num,
                      &separator[3])) {
        char sep1 = separator[0];
        int i;

        /* The four separators should be identical, or else this is an oddly
           formatted reply and we bail out immediately. */
        for(i=1; i<4; i++) {
          if(separator[i] != sep1) {
            ptr=NULL; /* set to NULL to signal error */
            break;
          }
        }
        if(ptr) {
          newport = num;

          /* We must use the same IP we are already connected to */
          snprintf(newhost, NEWHOST_BUFSIZE, "%s", conn->ip_addr_str);
        }
      }
      else
        ptr=NULL;
    }
    if(!ptr) {
      failf(data, "Weirdly formatted EPSV reply");
      return CURLE_FTP_WEIRD_PASV_REPLY;
    }
  }
  else
    return CURLE_FTP_CANT_RECONNECT;

  if(data->change.proxy && *data->change.proxy) {
    /*
     * This is a tunnel through a http proxy and we need to connect to the
     * proxy again here.
     *
     * We don't want to rely on a former host lookup that might've expired
     * now, instead we remake the lookup here and now!
     */
    rc = Curl_resolv(conn, conn->proxy.name, (int)conn->port, &addr);
    if(rc == CURLRESOLV_PENDING)
      rc = Curl_wait_for_resolv(conn, &addr);

    connectport =
      (unsigned short)conn->port; /* we connect to the proxy's port */

  }
  else {
    /* normal, direct, ftp connection */
    rc = Curl_resolv(conn, newhost, newport, &addr);
    if(rc == CURLRESOLV_PENDING)
      rc = Curl_wait_for_resolv(conn, &addr);

    if(!addr) {
      failf(data, "Can't resolve new host %s:%d", newhost, newport);
      return CURLE_FTP_CANT_GET_HOST;
    }
    connectport = newport; /* we connect to the remote port */
  }

  result = Curl_connecthost(conn,
                            addr,
                            &conn->sock[SECONDARYSOCKET],
                            &conninfo,
                            connected);

  Curl_resolv_unlock(data, addr); /* we're done using this address */

  if(result)
    return result;

  /*
   * When this is used from the multi interface, this might've returned with
   * the 'connected' set to FALSE and thus we are now awaiting a non-blocking
   * connect to connect and we should not be "hanging" here waiting.
   */

  if(data->set.verbose)
    /* this just dumps information about this second connection */
    ftp_pasv_verbose(conn, conninfo, newhost, connectport);

#ifndef CURL_DISABLE_HTTP
  if(conn->bits.tunnel_proxy) {
    /* We want "seamless" FTP operations through HTTP proxy tunnel */
    result = Curl_ConnectHTTPProxyTunnel(conn, SECONDARYSOCKET,
                                         newhost, newport);
    if(CURLE_OK != result)
      return result;
  }
#endif   /* CURL_DISABLE_HTTP */

  return CURLE_OK;
}

/*
 * Curl_ftp_nextconnect()
 *
 * This function shall be called when the second FTP connection has been
 * established and is confirmed connected.
 */

CURLcode Curl_ftp_nextconnect(struct connectdata *conn)
{
  struct SessionHandle *data=conn->data;
  char *buf = data->state.buffer; /* this is our buffer */
  CURLcode result;
  ssize_t nread;
  int ftpcode; /* for ftp status */

  /* the ftp struct is already inited in Curl_ftp_connect() */
  struct FTP *ftp = conn->proto.ftp;
  curl_off_t *bytecountp = ftp->bytecountp;

  if(data->set.upload) {

    /* Set type to binary (unless specified ASCII) */
    result = ftp_transfertype(conn, data->set.ftp_ascii);
    if(result)
      return result;

    /* Send any PREQUOTE strings after transfer type is set? (Wesley Laxton)*/
    if(data->set.prequote) {
      if ((result = ftp_sendquote(conn, data->set.prequote)) != CURLE_OK)
        return result;
    }

    if(conn->resume_from) {
      /* we're about to continue the uploading of a file */
      /* 1. get already existing file's size. We use the SIZE
         command for this which may not exist in the server!
         The SIZE command is not in RFC959. */

      /* 2. This used to set REST. But since we can do append, we
         don't another ftp command. We just skip the source file
         offset and then we APPEND the rest on the file instead */

      /* 3. pass file-size number of bytes in the source file */
      /* 4. lower the infilesize counter */
      /* => transfer as usual */

      if(conn->resume_from < 0 ) {
        /* we could've got a specified offset from the command line,
           but now we know we didn't */
        curl_off_t gottensize;

        if(CURLE_OK != ftp_getsize(conn, ftp->file, &gottensize)) {
          failf(data, "Couldn't get remote file size");
          return CURLE_FTP_COULDNT_GET_SIZE;
        }
        conn->resume_from = gottensize;
      }

      if(conn->resume_from) {
        /* do we still game? */
        curl_off_t passed=0;
        /* enable append instead */
        data->set.ftp_append = 1;

        /* Now, let's read off the proper amount of bytes from the
           input. If we knew it was a proper file we could've just
           fseek()ed but we only have a stream here */
        do {
          curl_off_t readthisamountnow = (conn->resume_from - passed);
          curl_off_t actuallyread;

          if(readthisamountnow > BUFSIZE)
            readthisamountnow = BUFSIZE;

          actuallyread = (curl_off_t)
            conn->fread(data->state.buffer, 1, (size_t)readthisamountnow,
                        conn->fread_in);

          passed += actuallyread;
          if(actuallyread != readthisamountnow) {
            failf(data, "Could only read %" FORMAT_OFF_T
                  " bytes from the input", passed);
            return CURLE_FTP_COULDNT_USE_REST;
          }
        }
        while(passed != conn->resume_from);

        /* now, decrease the size of the read */
        if(data->set.infilesize>0) {
          data->set.infilesize -= conn->resume_from;

          if(data->set.infilesize <= 0) {
            infof(data, "File already completely uploaded\n");

            /* no data to transfer */
            result=Curl_Transfer(conn, -1, -1, FALSE, NULL, -1, NULL);

            /* Set no_transfer so that we won't get any error in
             * Curl_ftp_done() because we didn't transfer anything! */
            ftp->no_transfer = TRUE;

            return CURLE_OK;
          }
        }
        /* we've passed, proceed as normal */
      }
    }

    /* Send everything on data->state.in to the socket */
    if(data->set.ftp_append) {
      /* we append onto the file instead of rewriting it */
      FTPSENDF(conn, "APPE %s", ftp->file);
    }
    else {
      FTPSENDF(conn, "STOR %s", ftp->file);
    }

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

    if(ftpcode>=400) {
      failf(data, "Failed FTP upload: %03d", ftpcode);
      /* oops, we never close the sockets! */
      return CURLE_FTP_COULDNT_STOR_FILE;
    }

    if(data->set.ftp_use_port) {
      /* PORT means we are now awaiting the server to connect to us. */
      result = AllowServerConnect(conn);
      if( result )
        return result;
    }

    if(conn->ssl[SECONDARYSOCKET].use) {
      /* since we only have a plaintext TCP connection here, we must now
         do the TLS stuff */
      infof(data, "Doing the SSL/TLS handshake on the data stream\n");
      result = Curl_SSLConnect(conn, SECONDARYSOCKET);
      if(result)
        return result;
    }

    *bytecountp=0;

    /* When we know we're uploading a specified file, we can get the file
       size prior to the actual upload. */

    Curl_pgrsSetUploadSize(data, data->set.infilesize);

    result = Curl_Transfer(conn, -1, -1, FALSE, NULL, /* no download */
                           SECONDARYSOCKET, bytecountp);
    if(result)
      return result;

  }
  else if(!conn->bits.no_body) {
    /* Retrieve file or directory */
    bool dirlist=FALSE;
    curl_off_t downloadsize=-1;

    if(conn->bits.use_range && conn->range) {
      curl_off_t from, to;
      curl_off_t totalsize=-1;
      char *ptr;
      char *ptr2;

      from=curlx_strtoofft(conn->range, &ptr, 0);
      while(ptr && *ptr && (isspace((int)*ptr) || (*ptr=='-')))
        ptr++;
      to=curlx_strtoofft(ptr, &ptr2, 0);
      if(ptr == ptr2) {
        /* we didn't get any digit */
        to=-1;
      }
      if((-1 == to) && (from>=0)) {
        /* X - */
        conn->resume_from = from;
        infof(data, "FTP RANGE %" FORMAT_OFF_T " to end of file\n", from);
      }
      else if(from < 0) {
        /* -Y */
        totalsize = -from;
        conn->maxdownload = -from;
        conn->resume_from = from;
        infof(data, "FTP RANGE the last %" FORMAT_OFF_T " bytes\n", totalsize);
      }
      else {
        /* X-Y */
        totalsize = to-from;
        conn->maxdownload = totalsize+1; /* include the last mentioned byte */
        conn->resume_from = from;
        infof(data, "FTP RANGE from %" FORMAT_OFF_T
              " getting %" FORMAT_OFF_T " bytes\n", from, conn->maxdownload);
      }
      infof(data, "range-download from %" FORMAT_OFF_T
            " to %" FORMAT_OFF_T ", totally %" FORMAT_OFF_T " bytes\n",
            from, to, conn->maxdownload);
      ftp->dont_check = TRUE; /* dont check for successful transfer */
    }

    if((data->set.ftp_list_only) || !ftp->file) {
      /* The specified path ends with a slash, and therefore we think this
         is a directory that is requested, use LIST. But before that we
         need to set ASCII transfer mode. */
      dirlist = TRUE;

      /* Set type to ASCII */
      result = ftp_transfertype(conn, TRUE /* ASCII enforced */);
      if(result)
        return result;

      /* if this output is to be machine-parsed, the NLST command will be
         better used since the LIST command output is not specified or
         standard in any way */

      FTPSENDF(conn, "%s",
            data->set.customrequest?data->set.customrequest:
            (data->set.ftp_list_only?"NLST":"LIST"));
    }
    else {
      curl_off_t foundsize;

      /* Set type to binary (unless specified ASCII) */
      result = ftp_transfertype(conn, data->set.ftp_ascii);
      if(result)
        return result;

      /* Send any PREQUOTE strings after transfer type is set? */
      if(data->set.prequote) {
        if ((result = ftp_sendquote(conn, data->set.prequote)) != CURLE_OK)
          return result;
      }

      /* Attempt to get the size, it'll be useful in some cases: for resumed
         downloads and when talking to servers that don't give away the size
         in the RETR response line. */
      result = ftp_getsize(conn, ftp->file, &foundsize);
      if(CURLE_OK == result) {
        if (data->set.max_filesize && foundsize > data->set.max_filesize) {
          failf(data, "Maximum file size exceeded");
          return CURLE_FILESIZE_EXCEEDED;
        }
        downloadsize = foundsize;
      }

      if(conn->resume_from) {

        /* Daniel: (August 4, 1999)
         *
         * We start with trying to use the SIZE command to figure out the size
         * of the file we're gonna get. If we can get the size, this is by far
         * the best way to know if we're trying to resume beyond the EOF.
         *
         * Daniel, November 28, 2001. We *always* get the size on downloads
         * now, so it is done before this even when not doing resumes. I saved
         * the comment above for nostalgical reasons! ;-)
         */
        if(CURLE_OK != result) {
          infof(data, "ftp server doesn't support SIZE\n");
          /* We couldn't get the size and therefore we can't know if there
             really is a part of the file left to get, although the server
             will just close the connection when we start the connection so it
             won't cause us any harm, just not make us exit as nicely. */
        }
        else {
          /* We got a file size report, so we check that there actually is a
             part of the file left to get, or else we go home.  */
          if(conn->resume_from< 0) {
            /* We're supposed to download the last abs(from) bytes */
            if(foundsize < -conn->resume_from) {
              failf(data, "Offset (%" FORMAT_OFF_T