ssh.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2011, 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.
 *
 ***************************************************************************/

/* #define CURL_LIBSSH2_DEBUG */

#include "setup.h"

#ifdef USE_LIBSSH2
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <ctype.h>
#ifdef HAVE_LIMITS_H
#  include <limits.h>
#endif

#include <libssh2.h>
#include <libssh2_sftp.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#ifdef HAVE_TIME_H
#include <time.h>
#endif

#ifndef WIN32
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#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 /* !WIN32 */

#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 "easyif.h" /* for Curl_convert_... prototypes */

#include "hostip.h"
#include "progress.h"
#include "transfer.h"
#include "escape.h"
#include "http.h" /* for HTTP proxy tunnel stuff */
#include "ssh.h"
#include "url.h"
#include "speedcheck.h"
#include "getinfo.h"

#include "strequal.h"
#include "sslgen.h"
#include "connect.h"
#include "strerror.h"
#include "inet_ntop.h"
#include "parsedate.h" /* for the week day and month names */
#include "sockaddr.h" /* required for Curl_sockaddr_storage */
#include "strtoofft.h"
#include "multiif.h"
#include "select.h"
#include "warnless.h"

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

#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"

#ifndef PATH_MAX
#define PATH_MAX 1024 /* just an extra precaution since there are systems that
                         have their definition hidden well */
#endif

/* Local functions: */
static const char *sftp_libssh2_strerror(unsigned long err);
static LIBSSH2_ALLOC_FUNC(my_libssh2_malloc);
static LIBSSH2_REALLOC_FUNC(my_libssh2_realloc);
static LIBSSH2_FREE_FUNC(my_libssh2_free);

static CURLcode get_pathname(const char **cpp, char **path);

static CURLcode ssh_connect(struct connectdata *conn, bool *done);
static CURLcode ssh_multi_statemach(struct connectdata *conn, bool *done);
static CURLcode ssh_do(struct connectdata *conn, bool *done);

static CURLcode ssh_getworkingpath(struct connectdata *conn,
                                   char *homedir, /* when SFTP is used */
                                   char **path);

static CURLcode scp_done(struct connectdata *conn,
                         CURLcode, bool premature);
static CURLcode scp_doing(struct connectdata *conn,
                          bool *dophase_done);
static CURLcode scp_disconnect(struct connectdata *conn, bool dead_connection);

static CURLcode sftp_done(struct connectdata *conn,
                          CURLcode, bool premature);
static CURLcode sftp_doing(struct connectdata *conn,
                           bool *dophase_done);
static CURLcode sftp_disconnect(struct connectdata *conn, bool dead_connection);
static
CURLcode sftp_perform(struct connectdata *conn,
                      bool *connected,
                      bool *dophase_done);

static int ssh_getsock(struct connectdata *conn,
                       curl_socket_t *sock, /* points to numsocks number
                                               of sockets */
                       int numsocks);

static int ssh_perform_getsock(const struct connectdata *conn,
                               curl_socket_t *sock, /* points to numsocks
                                                       number of sockets */
                               int numsocks);

/*
 * SCP protocol handler.
 */

const struct Curl_handler Curl_handler_scp = {
  "SCP",                                /* scheme */
  ZERO_NULL,                            /* setup_connection */
  ssh_do,                               /* do_it */
  scp_done,                             /* done */
  ZERO_NULL,                            /* do_more */
  ssh_connect,                          /* connect_it */
  ssh_multi_statemach,                  /* connecting */
  scp_doing,                            /* doing */
  ssh_getsock,                          /* proto_getsock */
  ssh_getsock,                          /* doing_getsock */
  ssh_perform_getsock,                  /* perform_getsock */
  scp_disconnect,                       /* disconnect */
  PORT_SSH,                             /* defport */
  PROT_SCP                              /* protocol */
};


/*
 * SFTP protocol handler.
 */

const struct Curl_handler Curl_handler_sftp = {
  "SFTP",                               /* scheme */
  ZERO_NULL,                            /* setup_connection */
  ssh_do,                               /* do_it */
  sftp_done,                            /* done */
  ZERO_NULL,                            /* do_more */
  ssh_connect,                          /* connect_it */
  ssh_multi_statemach,                  /* connecting */
  sftp_doing,                           /* doing */
  ssh_getsock,                          /* proto_getsock */
  ssh_getsock,                          /* doing_getsock */
  ssh_perform_getsock,                  /* perform_getsock */
  sftp_disconnect,                      /* disconnect */
  PORT_SSH,                             /* defport */
  PROT_SFTP                             /* protocol */