ftp.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2005, 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

#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)

#else /* probably 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
#ifdef HAVE_UTSNAME_H
#include <sys/utsname.h>
#endif
#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

#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
#undef in_addr_t
#define in_addr_t unsigned long
#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 HAVE_KRB4
#include "krb4.h"
#endif

#include "strtoofft.h"
#include "strequal.h"
#include "ssluse.h"
#include "connect.h"
#include "strerror.h"
#include "memory.h"
#include "inet_ntop.h"
#include "select.h"
#include "parsedate.h" /* for the week day and month names */

#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 CURLDEBUG
#include "memdebug.h"
#endif

#ifdef HAVE_NI_WITHSCOPEID
#define NIFLAGS NI_NUMERICHOST | NI_NUMERICSERV | NI_WITHSCOPEID
#else
#define NIFLAGS NI_NUMERICHOST | NI_NUMERICSERV
#endif

/* Local API functions */
static CURLcode ftp_sendquote(struct connectdata *conn,
                              struct curl_slist *quote);
static CURLcode ftp_cwd(struct connectdata *conn, char *path);
static CURLcode ftp_mkd(struct connectdata *conn, char *path);
static CURLcode ftp_cwd_and_mkd(struct connectdata *conn, char *path);
static CURLcode ftp_quit(struct connectdata *conn);
static CURLcode ftp_3rdparty_pretransfer(struct connectdata *conn);
static CURLcode ftp_3rdparty_transfer(struct connectdata *conn);
static CURLcode ftp_parse_url_path(struct connectdata *conn);
static CURLcode ftp_cwd_and_create_path(struct connectdata *conn);
static CURLcode ftp_regular_transfer(struct connectdata *conn, bool *done);
static CURLcode ftp_3rdparty(struct connectdata *conn);
static void ftp_pasv_verbose(struct connectdata *conn,
                             Curl_addrinfo *ai,
                             char *newhost, /* ascii version */
                             int port);
static CURLcode ftp_state_post_rest(struct connectdata *conn);
static CURLcode ftp_state_post_cwd(struct connectdata *conn);
static CURLcode ftp_state_quote(struct connectdata *conn,
                                bool init, ftpstate instate);

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

static void freedirs(struct FTP *ftp)
{
  int i;
  if(ftp->dirs) {
    for (i=0; i < ftp->dirdepth; i++){
      if(ftp->dirs[i]) {
        free(ftp->dirs[i]);
        ftp->dirs[i]=NULL;
      }
    }
    free(ftp->dirs);
    ftp->dirs = NULL;
  }
  if(ftp->file) {
    free(ftp->file);
    ftp->file = NULL;
  }
}

/* Returns non-zero iff the given string contains CR (0x0D) or LF (0x0A), which
   are not allowed within RFC 959 <string>.
 */
static bool isBadFtpString(const char *string)
{
  return strchr(string, 0x0D) != NULL || strchr(string, 0x0A) != NULL;
}

/***********************************************************************
 *
 * 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 connectdata *conn)
{
  int timeout_ms;
  struct SessionHandle *data = conn->data;
  curl_socket_t sock = conn->sock[SECONDARYSOCKET];
  struct timeval now = Curl_tvnow();
  long timespent = Curl_tvdiff(Curl_tvnow(), now)/1000;
  long timeout = data->set.connecttimeout?data->set.connecttimeout:
    (data->set.timeout?data->set.timeout: 0);

  if(timeout) {
    timeout -= timespent;
    if(timeout<=0) {
      failf(data, "Timed out before server could connect to us");
      return CURLE_OPERATION_TIMEDOUT;
    }
  }

  /* We allow the server 60 seconds to connect to us, or a custom timeout.
     Note the typecast here. */
  timeout_ms = (timeout?(int)timeout:60) * 1000;

  switch (Curl_select(sock, CURL_SOCKET_BAD, timeout_ms)) {