libsshpp.hpp

/*
 * This file is part of the SSH Library
 *
 * Copyright (c) 2010 by Aris Adamantiadis
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef LIBSSHPP_HPP_
#define LIBSSHPP_HPP_

/* do not use deprecated functions */
#define LIBSSH_LEGACY_0_4

#include <libssh/libssh.h>
#include <libssh/server.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string>

namespace ssh {

class Channel;
#ifndef SSH_NO_CPP_EXCEPTIONS

class SshException{
public:
  SshException(ssh_session csession){
    code=ssh_get_error_code(csession);
    description=std::string(ssh_get_error(csession));
  }
  SshException(const SshException &e){
    code=e.code;
    description=e.description;
  }
  int getCode(){
    return code;
  }
  std::string getError(){
    return description;
  }
private:
  int code;
  std::string description;
};

#define ssh_throw(x) if((x)==SSH_ERROR) throw SshException(getCSession())
#define ssh_throw_null(CSession,x) if((x)==NULL) throw SshException(CSession)
#define void_throwable void
#define return_throwable return

#else

/* No exception at all. All functions will return an error code instead
 * of an exception
 */
#define ssh_throw(x) if((x)==SSH_ERROR) return SSH_ERROR
#define ssh_throw_null(CSession,x) if((x)==NULL) return NULL
#define void_throwable int
#define return_throwable return SSH_OK
#endif

class Session {
  friend class Channel;
public:
  Session(){
    c_session=ssh_new();
  }
  ~Session(){
    ssh_free(c_session);
    c_session=NULL;
  }
  void_throwable setOption(enum ssh_options_e type, const char *option){
    ssh_throw(ssh_options_set(c_session,type,option));
    return_throwable;
  }
  void_throwable setOption(enum ssh_options_e type, long int option){
    ssh_throw(ssh_options_set(c_session,type,&option));
    return_throwable;
  }
  void_throwable setOption(enum ssh_options_e type, void *option){
    ssh_throw(ssh_options_set(c_session,type,option));
    return_throwable;
  }
  void_throwable connect(){
    int ret=ssh_connect(c_session);
    ssh_throw(ret);
    return_throwable;
  }
  int userauthPublickeyAuto(void){
    int ret=ssh_userauth_publickey_auto(c_session, NULL, NULL);
    ssh_throw(ret);
    return ret;
  }
  int userauthNone(){
    int ret=ssh_userauth_none(c_session,NULL);
    ssh_throw(ret);
    return ret;
  }
  int userauthPassword(const char *password){
    int ret=ssh_userauth_password(c_session,NULL,password);
    ssh_throw(ret);
    return ret;
  }
  int userauthTryPublickey(ssh_key pubkey){
    int ret=ssh_userauth_try_publickey(c_session, NULL, pubkey);
    ssh_throw(ret);
    return ret;
  }
  int userauthPublickey(ssh_key privkey){
    int ret=ssh_userauth_publickey(c_session, NULL, privkey);
    ssh_throw(ret);
    return ret;
  }
  int userauthPrivatekeyFile(const char *filename,
      const char *passphrase);
  int getAuthList(){
    int ret=ssh_userauth_list(c_session, NULL);
    ssh_throw(ret);
    return ret;
  }
  void disconnect(){
    ssh_disconnect(c_session);
  }
  const char *getDisconnectMessage(){
    const char *msg=ssh_get_disconnect_message(c_session);
    return msg;
  }
  const char *getError(){
    return ssh_get_error(c_session);
  }
  int getErrorCode(){
    return ssh_get_error_code(c_session);
  }
  socket_t getSocket(){
    return ssh_get_fd(c_session);
  }
  std::string getIssueBanner(){
    char *banner=ssh_get_issue_banner(c_session);
    std::string ret= std::string(banner);
    ::free(banner);
    return ret;
  }
  int getOpensshVersion(){
    return ssh_get_openssh_version(c_session);
  }
  int getVersion(){
    return ssh_get_version(c_session);
  }
  int isServerKnown(){
    int ret=ssh_is_server_known(c_session);
    ssh_throw(ret);
    return ret;
  }
  void log(int priority, const char *format, ...){
    char buffer[1024];
    va_list va;

    va_start(va, format);
    vsnprintf(buffer, sizeof(buffer), format, va);
    va_end(va);
    _ssh_log(priority, "libsshpp", "%s", buffer);
  }

  void_throwable optionsCopy(const Session &source){
    ssh_throw(ssh_options_copy(source.c_session,&c_session));
    return_throwable;
  }
  void_throwable optionsParseConfig(const char *file){
    ssh_throw(ssh_options_parse_config(c_session,file));
    return_throwable;
  }
  void silentDisconnect(){
    ssh_silent_disconnect(c_session);
  }
  int writeKnownhost(){
    int ret = ssh_write_knownhost(c_session);
    ssh_throw(ret);
    return ret;
  }

  inline Channel *acceptForward(int timeout_ms);
  /* implemented outside the class due Channel references */

  void_throwable cancelForward(const char *address, int port){
    int err=ssh_channel_cancel_forward(c_session, address, port);
    ssh_throw(err);
    return_throwable;
  }

  void_throwable listenForward(const char *address, int port,
      int &boundport){
    int err=ssh_channel_listen_forward(c_session, address, port, &boundport);
    ssh_throw(err);
    return_throwable;
  }

private:
  ssh_session c_session;
  ssh_session getCSession(){
    return c_session;
  }
  /* No copy constructor, no = operator */
  Session(const Session &);
  Session& operator=(const Session &);
};

class Channel {
  friend class Session;
public:
  Channel(Session &session){
    channel=ssh_channel_new(session.getCSession());
    this->session=&session;
  }
  ~Channel(){
    ssh_channel_free(channel);
    channel=NULL;
  }

  Channel *acceptX11(int timeout_ms){
    ssh_channel x11chan = ssh_channel_accept_x11(channel,timeout_ms);
    ssh_throw_null(getCSession(),x11chan);
    Channel *newchan = new Channel(getSession(),x11chan);
    return newchan;
  }
  void_throwable changePtySize(int cols, int rows){
    int err=ssh_channel_change_pty_size(channel,cols,rows);
    ssh_throw(err);
    return_throwable;
  }

  void_throwable close(){
    ssh_throw(ssh_channel_close(channel));
    return_throwable;
  }

  int getExitStatus(){
    return ssh_channel_get_exit_status(channel);
  }
  Session &getSession(){
    return *session;
  }
  bool isClosed(){
    return ssh_channel_is_closed(channel) != 0;
  }
  bool isEof(){
    return ssh_channel_is_eof(channel) != 0;
  }
  bool isOpen(){
    return ssh_channel_is_open(channel) != 0;
  }
  int openForward(const char *remotehost, int remoteport,
      const char *sourcehost=NULL, int localport=0){
    int err=ssh_channel_open_forward(channel,remotehost,remoteport,
        sourcehost, localport);
    ssh_throw(err);
    return err;
  }
  /* TODO: completely remove this ? */
  void_throwable openSession(){
    int err=ssh_channel_open_session(channel);
    ssh_throw(err);
    return_throwable;
  }
  int poll(bool is_stderr=false){
    int err=ssh_channel_poll(channel,is_stderr);
    ssh_throw(err);
    return err;
  }
  int read(void *dest, size_t count, bool is_stderr){
    int err;
    /* handle int overflow */
    if(count > 0x7fffffff)
      count = 0x7fffffff;
    err=ssh_channel_read_timeout(channel,dest,count,is_stderr,-1);
    ssh_throw(err);
    return err;
  }
  int read(void *dest, size_t count, int timeout){
    int err;
    /* handle int overflow */
    if(count > 0x7fffffff)
      count = 0x7fffffff;
    err=ssh_channel_read_timeout(channel,dest,count,false,timeout);
    ssh_throw(err);
    return err;
  }
  int read(void *dest, size_t count, bool is_stderr=false, int timeout=-1){
    int err;
    /* handle int overflow */
    if(count > 0x7fffffff)
      count = 0x7fffffff;
    err=ssh_channel_read_timeout(channel,dest,count,is_stderr,timeout);
    ssh_throw(err);
    return err;
  }
  int readNonblocking(void *dest, size_t count, bool is_stderr=false){
    int err;
    /* handle int overflow */
    if(count > 0x7fffffff)
      count = 0x7fffffff;
    err=ssh_channel_read_nonblocking(channel,dest,count,is_stderr);
    ssh_throw(err);
    return err;
  }
  void_throwable requestEnv(const char *name, const char *value){
    int err=ssh_channel_request_env(channel,name,value);
    ssh_throw(err);
    return_throwable;
  }

  void_throwable requestExec(const char *cmd){
    int err=ssh_channel_request_exec(channel,cmd);
    ssh_throw(err);
    return_throwable;
  }
  void_throwable requestPty(const char *term=NULL, int cols=0, int rows=0){
    int err;
    if(term != NULL && cols != 0 && rows != 0)
      err=ssh_channel_request_pty_size(channel,term,cols,rows);
    else
      err=ssh_channel_request_pty(channel);
    ssh_throw(err);
    return_throwable;
  }

  void_throwable requestShell(){
    int err=ssh_channel_request_shell(channel);
    ssh_throw(err);
    return_throwable;
  }
  void_throwable requestSendSignal(const char *signum){
    int err=ssh_channel_request_send_signal(channel, signum);
    ssh_throw(err);
    return_throwable;
  }
  void_throwable requestSubsystem(const char *subsystem){
    int err=ssh_channel_request_subsystem(channel,subsystem);
    ssh_throw(err);
    return_throwable;
  }
  int requestX11(bool single_connection,
      const char *protocol, const char *cookie, int screen_number){
    int err=ssh_channel_request_x11(channel,single_connection,
        protocol, cookie, screen_number);
    ssh_throw(err);
    return err;
  }
  void_throwable sendEof(){
    int err=ssh_channel_send_eof(channel);
    ssh_throw(err);
    return_throwable;
  }
  int write(const void *data, size_t len, bool is_stderr=false){
    int ret;
    if(is_stderr){
      ret=ssh_channel_write_stderr(channel,data,len);
    } else {
      ret=ssh_channel_write(channel,data,len);
    }
    ssh_throw(ret);
    return ret;
  }
private:
  ssh_session getCSession(){
    return session->getCSession();
  }
  Channel (Session &session, ssh_channel c_channel){
    this->channel=c_channel;
    this->session=&session;
  }
  Session *session;
  ssh_channel channel;
  /* No copy and no = operator */
  Channel(const Channel &);
  Channel &operator=(const Channel &);
};


inline Channel *Session::acceptForward(int timeout_ms){
    ssh_channel forward =
        ssh_channel_accept_forward(c_session, timeout_ms, NULL);
    ssh_throw_null(c_session,forward);
    Channel *newchan = new Channel(*this,forward);
    return newchan;
  }

} // namespace ssh

#endif /* LIBSSHPP_HPP_ */