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;