libssh  0.8.2
The SSH library
libsshpp.hpp
1 /*
2  * This file is part of the SSH Library
3  *
4  * Copyright (c) 2010 by Aris Adamantiadis
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef LIBSSHPP_HPP_
22 #define LIBSSHPP_HPP_
23 
51 /* do not use deprecated functions */
52 #define LIBSSH_LEGACY_0_4
53 
54 #include <libssh/libssh.h>
55 #include <libssh/server.h>
56 #include <stdlib.h>
57 #include <stdarg.h>
58 #include <stdio.h>
59 #include <string>
60 
61 namespace ssh {
62 
63 class Channel;
68 #ifndef SSH_NO_CPP_EXCEPTIONS
69 
75 public:
76  SshException(ssh_session csession){
77  code=ssh_get_error_code(csession);
78  description=std::string(ssh_get_error(csession));
79  }
80  SshException(const SshException &e){
81  code=e.code;
82  description=e.description;
83  }
89  int getCode(){
90  return code;
91  }
96  std::string getError(){
97  return description;
98  }
99 private:
100  int code;
101  std::string description;
102 };
103 
107 #define ssh_throw(x) if((x)==SSH_ERROR) throw SshException(getCSession())
108 #define ssh_throw_null(CSession,x) if((x)==NULL) throw SshException(CSession)
109 #define void_throwable void
110 #define return_throwable return
111 
112 #else
113 
114 /* No exception at all. All functions will return an error code instead
115  * of an exception
116  */
117 #define ssh_throw(x) if((x)==SSH_ERROR) return SSH_ERROR
118 #define ssh_throw_null(CSession,x) if((x)==NULL) return NULL
119 #define void_throwable int
120 #define return_throwable return SSH_OK
121 #endif
122 
126 class Session {
127  friend class Channel;
128 public:
129  Session(){
130  c_session=ssh_new();
131  }
132  ~Session(){
133  ssh_free(c_session);
134  c_session=NULL;
135  }
142  void_throwable setOption(enum ssh_options_e type, const char *option){
143  ssh_throw(ssh_options_set(c_session,type,option));
144  return_throwable;
145  }
152  void_throwable setOption(enum ssh_options_e type, long int option){
153  ssh_throw(ssh_options_set(c_session,type,&option));
154  return_throwable;
155  }
162  void_throwable setOption(enum ssh_options_e type, void *option){
163  ssh_throw(ssh_options_set(c_session,type,option));
164  return_throwable;
165  }
170  void_throwable connect(){
171  int ret=ssh_connect(c_session);
172  ssh_throw(ret);
173  return_throwable;
174  }
181  int ret=ssh_userauth_publickey_auto(c_session, NULL, NULL);
182  ssh_throw(ret);
183  return ret;
184  }
193  int ret=ssh_userauth_none(c_session,NULL);
194  ssh_throw(ret);
195  return ret;
196  }
197 
214  int userauthKbdint(const char* username, const char* submethods){
215  int ret=ssh_userauth_kbdint(c_session,NULL,NULL);
216  ssh_throw(ret);
217  return ret;
218  }
219 
225  return ssh_userauth_kbdint_getnprompts(c_session);
226  }
227 
244  int userauthKbdintSetAnswer(unsigned int index, const char *answer)
245  {
246  int ret = ssh_userauth_kbdint_setanswer(c_session, index, answer);
247  ssh_throw(ret);
248  return ret;
249  }
250 
251 
252 
259  int userauthPassword(const char *password){
260  int ret=ssh_userauth_password(c_session,NULL,password);
261  ssh_throw(ret);
262  return ret;
263  }
272  int ret=ssh_userauth_try_publickey(c_session, NULL, pubkey);
273  ssh_throw(ret);
274  return ret;
275  }
283  int ret=ssh_userauth_publickey(c_session, NULL, privkey);
284  ssh_throw(ret);
285  return ret;
286  }
287 
293  int getAuthList(){
294  int ret=ssh_userauth_list(c_session, NULL);
295  ssh_throw(ret);
296  return ret;
297  }
301  void disconnect(){
302  ssh_disconnect(c_session);
303  }
308  const char *getDisconnectMessage(){
309  const char *msg=ssh_get_disconnect_message(c_session);
310  return msg;
311  }
315  const char *getError(){
316  return ssh_get_error(c_session);
317  }
321  int getErrorCode(){
322  return ssh_get_error_code(c_session);
323  }
330  socket_t getSocket(){
331  return ssh_get_fd(c_session);
332  }
337  std::string getIssueBanner(){
338  char *banner=ssh_get_issue_banner(c_session);
339  std::string ret;
340  if (banner)
341  {
342  ret= std::string(banner);
343  ::free(banner);
344  }
345  return ret;
346  }
352  return ssh_get_openssh_version(c_session);
353  }
358  int getVersion(){
359  return ssh_get_version(c_session);
360  }
368  int state = ssh_session_is_known_server(c_session);
369  ssh_throw(state);
370  return state;
371  }
372  void log(int priority, const char *format, ...){
373  char buffer[1024];
374  va_list va;
375 
376  va_start(va, format);
377  vsnprintf(buffer, sizeof(buffer), format, va);
378  va_end(va);
379  _ssh_log(priority, "libsshpp", "%s", buffer);
380  }
381 
386  void_throwable optionsCopy(const Session &source){
387  ssh_throw(ssh_options_copy(source.c_session,&c_session));
388  return_throwable;
389  }
395  void_throwable optionsParseConfig(const char *file){
396  ssh_throw(ssh_options_parse_config(c_session,file));
397  return_throwable;
398  }
403  ssh_silent_disconnect(c_session);
404  }
411  int ret = ssh_write_knownhost(c_session);
412  ssh_throw(ret);
413  return ret;
414  }
415 
424  inline Channel *acceptForward(int timeout_ms);
425  /* implemented outside the class due Channel references */
426 
427  void_throwable cancelForward(const char *address, int port){
428  int err=ssh_channel_cancel_forward(c_session, address, port);
429  ssh_throw(err);
430  return_throwable;
431  }
432 
433  void_throwable listenForward(const char *address, int port,
434  int &boundport){
435  int err=ssh_channel_listen_forward(c_session, address, port, &boundport);
436  ssh_throw(err);
437  return_throwable;
438  }
439 
440  ssh_session getCSession(){
441  return c_session;
442  }
443 
444 protected:
445  ssh_session c_session;
446 
447 private:
448  /* No copy constructor, no = operator */
449  Session(const Session &);
450  Session& operator=(const Session &);
451 };
452 
457 class Channel {
458  friend class Session;
459 public:
461  channel = ssh_channel_new(ssh_session.getCSession());
462  this->session = &ssh_session;
463  }
464  ~Channel(){
465  ssh_channel_free(channel);
466  channel=NULL;
467  }
468 
477  Channel *acceptX11(int timeout_ms){
478  ssh_channel x11chan = ssh_channel_accept_x11(channel,timeout_ms);
479  ssh_throw_null(getCSession(),x11chan);
480  Channel *newchan = new Channel(getSession(),x11chan);
481  return newchan;
482  }
489  void_throwable changePtySize(int cols, int rows){
490  int err=ssh_channel_change_pty_size(channel,cols,rows);
491  ssh_throw(err);
492  return_throwable;
493  }
494 
499  void_throwable close(){
500  ssh_throw(ssh_channel_close(channel));
501  return_throwable;
502  }
503 
504  int getExitStatus(){
505  return ssh_channel_get_exit_status(channel);
506  }
507  Session &getSession(){
508  return *session;
509  }
513  bool isClosed(){
514  return ssh_channel_is_closed(channel) != 0;
515  }
519  bool isEof(){
520  return ssh_channel_is_eof(channel) != 0;
521  }
525  bool isOpen(){
526  return ssh_channel_is_open(channel) != 0;
527  }
528  int openForward(const char *remotehost, int remoteport,
529  const char *sourcehost=NULL, int localport=0){
530  int err=ssh_channel_open_forward(channel,remotehost,remoteport,
531  sourcehost, localport);
532  ssh_throw(err);
533  return err;
534  }
535  /* TODO: completely remove this ? */
536  void_throwable openSession(){
537  int err=ssh_channel_open_session(channel);
538  ssh_throw(err);
539  return_throwable;
540  }
541  int poll(bool is_stderr=false){
542  int err=ssh_channel_poll(channel,is_stderr);
543  ssh_throw(err);
544  return err;
545  }
546  int read(void *dest, size_t count){
547  int err;
548  /* handle int overflow */
549  if(count > 0x7fffffff)
550  count = 0x7fffffff;
551  err=ssh_channel_read_timeout(channel,dest,count,false,-1);
552  ssh_throw(err);
553  return err;
554  }
555  int read(void *dest, size_t count, int timeout){
556  int err;
557  /* handle int overflow */
558  if(count > 0x7fffffff)
559  count = 0x7fffffff;
560  err=ssh_channel_read_timeout(channel,dest,count,false,timeout);
561  ssh_throw(err);
562  return err;
563  }
564  int read(void *dest, size_t count, bool is_stderr=false, int timeout=-1){
565  int err;
566  /* handle int overflow */
567  if(count > 0x7fffffff)
568  count = 0x7fffffff;
569  err=ssh_channel_read_timeout(channel,dest,count,is_stderr,timeout);
570  ssh_throw(err);
571  return err;
572  }
573  int readNonblocking(void *dest, size_t count, bool is_stderr=false){
574  int err;
575  /* handle int overflow */
576  if(count > 0x7fffffff)
577  count = 0x7fffffff;
578  err=ssh_channel_read_nonblocking(channel,dest,count,is_stderr);
579  ssh_throw(err);
580  return err;
581  }
582  void_throwable requestEnv(const char *name, const char *value){
583  int err=ssh_channel_request_env(channel,name,value);
584  ssh_throw(err);
585  return_throwable;
586  }
587 
588  void_throwable requestExec(const char *cmd){
589  int err=ssh_channel_request_exec(channel,cmd);
590  ssh_throw(err);
591  return_throwable;
592  }
593  void_throwable requestPty(const char *term=NULL, int cols=0, int rows=0){
594  int err;
595  if(term != NULL && cols != 0 && rows != 0)
596  err=ssh_channel_request_pty_size(channel,term,cols,rows);
597  else
598  err=ssh_channel_request_pty(channel);
599  ssh_throw(err);
600  return_throwable;
601  }
602 
603  void_throwable requestShell(){
604  int err=ssh_channel_request_shell(channel);
605  ssh_throw(err);
606  return_throwable;
607  }
608  void_throwable requestSendSignal(const char *signum){
609  int err=ssh_channel_request_send_signal(channel, signum);
610  ssh_throw(err);
611  return_throwable;
612  }
613  void_throwable requestSubsystem(const char *subsystem){
614  int err=ssh_channel_request_subsystem(channel,subsystem);
615  ssh_throw(err);
616  return_throwable;
617  }
618  int requestX11(bool single_connection,
619  const char *protocol, const char *cookie, int screen_number){
620  int err=ssh_channel_request_x11(channel,single_connection,
621  protocol, cookie, screen_number);
622  ssh_throw(err);
623  return err;
624  }
625  void_throwable sendEof(){
626  int err=ssh_channel_send_eof(channel);
627  ssh_throw(err);
628  return_throwable;
629  }
639  int write(const void *data, size_t len, bool is_stderr=false){
640  int ret;
641  if(is_stderr){
642  ret=ssh_channel_write_stderr(channel,data,len);
643  } else {
644  ret=ssh_channel_write(channel,data,len);
645  }
646  ssh_throw(ret);
647  return ret;
648  }
649 
650  ssh_session getCSession(){
651  return session->getCSession();
652  }
653 
654  ssh_channel getCChannel() {
655  return channel;
656  }
657 
658 protected:
659  Session *session;
660  ssh_channel channel;
661 
662 private:
663  Channel (Session &ssh_session, ssh_channel c_channel){
664  this->channel=c_channel;
665  this->session = &ssh_session;
666  }
667  /* No copy and no = operator */
668  Channel(const Channel &);
669  Channel &operator=(const Channel &);
670 };
671 
672 
673 inline Channel *Session::acceptForward(int timeout_ms){
674  ssh_channel forward =
675  ssh_channel_accept_forward(c_session, timeout_ms, NULL);
676  ssh_throw_null(c_session,forward);
677  Channel *newchan = new Channel(*this,forward);
678  return newchan;
679  }
680 
681 } // namespace ssh
682 
684 #endif /* LIBSSHPP_HPP_ */
int userauthNone()
Authenticates using the "none" method. Prefer using autopubkey if possible.
Definition: libsshpp.hpp:192
int userauthKbdintGetNPrompts()
Get the number of prompts (questions) the server has given.
Definition: libsshpp.hpp:224
int getAuthList()
Returns the available authentication methods from the server.
Definition: libsshpp.hpp:293
Definition: libsshpp.hpp:61
void_throwable setOption(enum ssh_options_e type, void *option)
sets an SSH session options
Definition: libsshpp.hpp:162
Definition: pki.h:42
LIBSSH_API int ssh_userauth_kbdint(ssh_session session, const char *user, const char *submethods)
Try to authenticate through the "keyboard-interactive" method.
Definition: auth.c:1572
LIBSSH_API int ssh_options_parse_config(ssh_session session, const char *filename)
Parse the ssh config file.
Definition: options.c:1255
Channel * acceptX11(int timeout_ms)
accept an incoming X11 connection
Definition: libsshpp.hpp:477
LIBSSH_API int ssh_channel_request_x11(ssh_channel channel, int single_connection, const char *protocol, const char *cookie, int screen_number)
Sends the "x11-req" channel request over an existing session channel.
Definition: channels.c:1846
LIBSSH_API int ssh_channel_request_shell(ssh_channel channel)
Request a shell.
Definition: channels.c:1735
LIBSSH_API int ssh_channel_open_forward(ssh_channel channel, const char *remotehost, int remoteport, const char *sourcehost, int localport)
Open a TCP/IP forwarding channel.
Definition: channels.c:923
LIBSSH_API int ssh_channel_is_eof(ssh_channel channel)
Check if remote has sent an EOF.
Definition: channels.c:1412
LIBSSH_API int ssh_channel_read_timeout(ssh_channel channel, void *dest, uint32_t count, int is_stderr, int timeout_ms)
Reads data from a channel.
Definition: channels.c:2660
int isServerKnown()
verifies that the server is known
Definition: libsshpp.hpp:367
LIBSSH_API int ssh_channel_send_eof(ssh_channel channel)
Send an end of file on the channel.
Definition: channels.c:1054
Definition: channels.h:57
LIBSSH_API int ssh_channel_close(ssh_channel channel)
Close a channel.
Definition: channels.c:1106
int userauthPublickey(ssh_key privkey)
Authenticates using the publickey method.
Definition: libsshpp.hpp:282
void_throwable optionsCopy(const Session &source)
copies options from a session to another
Definition: libsshpp.hpp:386
int getVersion()
returns the version of the SSH protocol being used
Definition: libsshpp.hpp:358
void_throwable changePtySize(int cols, int rows)
change the size of a pseudoterminal
Definition: libsshpp.hpp:489
Definition: libsshpp.hpp:126
LIBSSH_API int ssh_get_openssh_version(ssh_session session)
Get the version of the OpenSSH server, if it is not an OpenSSH server then 0 will be returned...
Definition: client.c:629
LIBSSH_API int ssh_userauth_list(ssh_session session, const char *username)
Get available authentication methods from the server.
Definition: auth.c:355
LIBSSH_API const char * ssh_get_error(void *error)
Retrieve the error text message from the last error.
Definition: error.c:128
LIBSSH_API int ssh_channel_write(ssh_channel channel, const void *data, uint32_t len)
Blocking write on a channel.
Definition: channels.c:1369
Definition: session.h:96
void_throwable optionsParseConfig(const char *file)
parses a configuration file for options
Definition: libsshpp.hpp:395
LIBSSH_API int ssh_channel_request_pty_size(ssh_channel channel, const char *term, int cols, int rows)
Request a pty with a specific type and size.
Definition: channels.c:1614
LIBSSH_API int ssh_channel_request_subsystem(ssh_channel channel, const char *subsystem)
Request a subsystem (for example "sftp").
Definition: channels.c:1757
the ssh::Channel class describes the state of an SSH channel.
Definition: libsshpp.hpp:457
LIBSSH_API int ssh_get_version(ssh_session session)
Get the protocol version of the session.
Definition: session.c:796
LIBSSH_API int ssh_channel_request_env(ssh_channel channel, const char *name, const char *value)
Set environment variables.
Definition: channels.c:2299
int userauthKbdint(const char *username, const char *submethods)
Authenticate through the "keyboard-interactive" method.
Definition: libsshpp.hpp:214
int userauthPublickeyAuto(void)
Authenticates automatically using public key.
Definition: libsshpp.hpp:180
LIBSSH_API char * ssh_get_issue_banner(ssh_session session)
Get the issue banner from the server.
Definition: client.c:603
int write(const void *data, size_t len, bool is_stderr=false)
Writes on a channel.
Definition: libsshpp.hpp:639
LIBSSH_API int ssh_userauth_kbdint_getnprompts(ssh_session session)
Get the number of prompts (questions) the server has given.
Definition: auth.c:1615
std::string getIssueBanner()
gets the Issue banner from the ssh server
Definition: libsshpp.hpp:337
LIBSSH_API int ssh_options_copy(ssh_session src, ssh_session *dest)
Duplicate the options of a session structure.
Definition: options.c:64
void disconnect()
Disconnects from the SSH server and closes connection.
Definition: libsshpp.hpp:301
int getCode()
returns the Error code
Definition: libsshpp.hpp:89
LIBSSH_API int ssh_channel_open_session(ssh_channel channel)
Open a session channel (suited for a shell, not TCP forwarding).
Definition: channels.c:858
if defined, disable C++ exceptions for libssh c++ wrapper
Definition: libsshpp.hpp:74
LIBSSH_API int ssh_channel_is_open(ssh_channel channel)
Check if the channel is open or not.
Definition: channels.c:1382
LIBSSH_API int ssh_write_knownhost(ssh_session session)
This function is deprecated.
Definition: known_hosts.c:519
LIBSSH_API int ssh_channel_is_closed(ssh_channel channel)
Check if the channel is closed or not.
Definition: channels.c:1398
socket_t getSocket()
returns the file descriptor used for the communication
Definition: libsshpp.hpp:330
int userauthKbdintSetAnswer(unsigned int index, const char *answer)
Set the answer for a question from a message block.
Definition: libsshpp.hpp:244
LIBSSH_API int ssh_channel_poll(ssh_channel channel, int is_stderr)
Polls a channel for data to read.
Definition: channels.c:2822
int writeKnownhost()
Writes the known host file with current host key.
Definition: libsshpp.hpp:410
ssh_channel ssh_channel_new(ssh_session session)
Allocate a new channel.
Definition: channels.c:79
LIBSSH_API int ssh_options_set(ssh_session session, enum ssh_options_e type, const void *value)
This function can set all possible ssh options.
Definition: options.c:417
LIBSSH_API int ssh_userauth_password(ssh_session session, const char *username, const char *password)
Try to authenticate by password.
Definition: auth.c:1156
LIBSSH_API int ssh_userauth_publickey_auto(ssh_session session, const char *username, const char *passphrase)
Tries to automatically authenticate with public key and "none".
Definition: auth.c:936
LIBSSH_API int ssh_userauth_kbdint_setanswer(ssh_session session, unsigned int i, const char *answer)
Set the answer for a question from a message block.
Definition: auth.c:1770
LIBSSH_API int ssh_userauth_publickey(ssh_session session, const char *username, const ssh_key privkey)
Authenticate with public/private key or certificate.
Definition: auth.c:572
LIBSSH_API socket_t ssh_get_fd(ssh_session session)
Get the fd of a connection.
Definition: session.c:529
int userauthPassword(const char *password)
Authenticates using the password method.
Definition: libsshpp.hpp:259
bool isEof()
returns true if channel is in EOF state
Definition: libsshpp.hpp:519
LIBSSH_API int ssh_channel_change_pty_size(ssh_channel channel, int cols, int rows)
Change the size of the terminal associated to a channel.
Definition: channels.c:1696
LIBSSH_API int ssh_connect(ssh_session session)
Connect to the ssh server.
Definition: client.c:488
LIBSSH_API void ssh_disconnect(ssh_session session)
Disconnect from a session (client or server). The session can then be reused to open a new session...
Definition: client.c:643
int getOpensshVersion()
returns the OpenSSH version (server) if possible
Definition: libsshpp.hpp:351
bool isClosed()
returns true if channel is in closed state
Definition: libsshpp.hpp:513
LIBSSH_API int ssh_userauth_none(ssh_session session, const char *username)
Try to authenticate through the "none" method.
Definition: auth.c:385
void_throwable setOption(enum ssh_options_e type, const char *option)
sets an SSH session options
Definition: libsshpp.hpp:142
LIBSSH_API ssh_channel ssh_channel_accept_x11(ssh_channel channel, int timeout_ms)
Accept an X11 forwarding channel.
Definition: channels.c:1962
LIBSSH_API int ssh_channel_listen_forward(ssh_session session, const char *address, int port, int *bound_port)
Sends the "tcpip-forward" global request to ask the server to begin listening for inbound connections...
Definition: channels.c:2166
LIBSSH_API int ssh_channel_request_send_signal(ssh_channel channel, const char *signum)
Send a signal to remote process (as described in RFC 4254, section 6.9).
Definition: channels.c:2439
std::string getError()
returns the error message of the last exception
Definition: libsshpp.hpp:96
void_throwable connect()
connects to the remote host
Definition: libsshpp.hpp:170
LIBSSH_API ssh_channel ssh_channel_accept_forward(ssh_session session, int timeout_ms, int *destination_port)
Accept an incoming TCP/IP forwarding channel and get information about incomming connection.
Definition: channels.c:2229
int userauthTryPublickey(ssh_key pubkey)
Try to authenticate using the publickey method.
Definition: libsshpp.hpp:271
void silentDisconnect()
silently disconnect from remote host
Definition: libsshpp.hpp:402
Channel * acceptForward(int timeout_ms)
accept an incoming forward connection
Definition: libsshpp.hpp:673
LIBSSH_API int ssh_channel_request_exec(ssh_channel channel, const char *cmd)
Run a shell command without an interactive shell.
Definition: channels.c:2369
bool isOpen()
returns true if channel is in open state
Definition: libsshpp.hpp:525
LIBSSH_API int ssh_channel_request_pty(ssh_channel channel)
Request a PTY.
Definition: channels.c:1677
LIBSSH_API enum ssh_known_hosts_e ssh_session_is_known_server(ssh_session session)
Check if the servers public key for the connected session is known.
Definition: knownhosts.c:889
LIBSSH_API void ssh_silent_disconnect(ssh_session session)
Disconnect impolitely from a remote host by closing the socket.
Definition: session.c:430
LIBSSH_API const char * ssh_get_disconnect_message(ssh_session session)
Get the disconnect message from the server.
Definition: session.c:771
LIBSSH_API ssh_session ssh_new(void)
Create a new ssh session.
Definition: session.c:58
LIBSSH_API void ssh_channel_free(ssh_channel channel)
Close and free a channel.
Definition: channels.c:979
LIBSSH_API int ssh_userauth_try_publickey(ssh_session session, const char *username, const ssh_key pubkey)
Try to authenticate with the given public key.
Definition: auth.c:468
void_throwable setOption(enum ssh_options_e type, long int option)
sets an SSH session options
Definition: libsshpp.hpp:152
LIBSSH_API int ssh_channel_get_exit_status(ssh_channel channel)
Get the exit status of the channel (error code from the executed instruction).
Definition: channels.c:2951
LIBSSH_API int ssh_channel_cancel_forward(ssh_session session, const char *address, int port)
Sends the "cancel-tcpip-forward" global request to ask the server to cancel the tcpip-forward request...
Definition: channels.c:2248
void_throwable close()
closes a channel
Definition: libsshpp.hpp:499
LIBSSH_API int ssh_channel_write_stderr(ssh_channel channel, const void *data, uint32_t len)
Blocking write on a channel stderr.
Definition: channels.c:3208
const char * getDisconnectMessage()
Returns the disconnect message from the server, if any.
Definition: libsshpp.hpp:308
LIBSSH_API void ssh_free(ssh_session session)
Deallocate a SSH session handle.
Definition: session.c:169
LIBSSH_API int ssh_channel_read_nonblocking(ssh_channel channel, void *dest, uint32_t count, int is_stderr)
Do a nonblocking read on the channel.
Definition: channels.c:2770
LIBSSH_API int ssh_get_error_code(void *error)
Retrieve the error code from the last error.
Definition: error.c:148