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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
74 class SshException{
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 }
180 int userauthPublickeyAuto(void){
181 int ret=ssh_userauth_publickey_auto(c_session, NULL, NULL);
182 ssh_throw(ret);
183 return ret;
184 }
192 int userauthNone(){
193 int ret=ssh_userauth_none(c_session,NULL);
194 ssh_throw(ret);
195 return ret;
196 }
203 int userauthPassword(const char *password){
204 int ret=ssh_userauth_password(c_session,NULL,password);
205 ssh_throw(ret);
206 return ret;
207 }
215 int userauthTryPublickey(ssh_key pubkey){
216 int ret=ssh_userauth_try_publickey(c_session, NULL, pubkey);
217 ssh_throw(ret);
218 return ret;
219 }
226 int userauthPublickey(ssh_key privkey){
227 int ret=ssh_userauth_publickey(c_session, NULL, privkey);
228 ssh_throw(ret);
229 return ret;
230 }
231 int userauthPrivatekeyFile(const char *filename,
232 const char *passphrase);
238 int getAuthList(){
239 int ret=ssh_userauth_list(c_session, NULL);
240 ssh_throw(ret);
241 return ret;
242 }
246 void disconnect(){
247 ssh_disconnect(c_session);
248 }
253 const char *getDisconnectMessage(){
254 const char *msg=ssh_get_disconnect_message(c_session);
255 return msg;
256 }
260 const char *getError(){
261 return ssh_get_error(c_session);
262 }
266 int getErrorCode(){
267 return ssh_get_error_code(c_session);
268 }
275 socket_t getSocket(){
276 return ssh_get_fd(c_session);
277 }
282 std::string getIssueBanner(){
283 char *banner=ssh_get_issue_banner(c_session);
284 std::string ret= std::string(banner);
285 ::free(banner);
286 return ret;
287 }
292 int getOpensshVersion(){
293 return ssh_get_openssh_version(c_session);
294 }
299 int getVersion(){
300 return ssh_get_version(c_session);
301 }
308 int isServerKnown(){
309 int ret=ssh_is_server_known(c_session);
310 ssh_throw(ret);
311 return ret;
312 }
313 void log(int priority, const char *format, ...){
314 char buffer[1024];
315 va_list va;
316
317 va_start(va, format);
318 vsnprintf(buffer, sizeof(buffer), format, va);
319 va_end(va);
320 _ssh_log(priority, "libsshpp", "%s", buffer);
321 }
322
327 void_throwable optionsCopy(const Session &source){
328 ssh_throw(ssh_options_copy(source.c_session,&c_session));
329 return_throwable;
330 }
336 void_throwable optionsParseConfig(const char *file){
337 ssh_throw(ssh_options_parse_config(c_session,file));
338 return_throwable;
339 }
343 void silentDisconnect(){
344 ssh_silent_disconnect(c_session);
345 }
351 int writeKnownhost(){
352 int ret = ssh_write_knownhost(c_session);
353 ssh_throw(ret);
354 return ret;
355 }
356
365 inline Channel *acceptForward(int timeout_ms);
366 /* implemented outside the class due Channel references */
367
368 void_throwable cancelForward(const char *address, int port){
369 int err=ssh_channel_cancel_forward(c_session, address, port);
370 ssh_throw(err);
371 return_throwable;
372 }
373
374 void_throwable listenForward(const char *address, int port,
375 int &boundport){
376 int err=ssh_channel_listen_forward(c_session, address, port, &boundport);
377 ssh_throw(err);
378 return_throwable;
379 }
380
381 private:
382 ssh_session c_session;
383 ssh_session getCSession(){
384 return c_session;
385 }
386 /* No copy constructor, no = operator */
387 Session(const Session &);
388 Session& operator=(const Session &);
389 };
390
395 class Channel {
396 friend class Session;
397 public:
398 Channel(Session &session){
399 channel=ssh_channel_new(session.getCSession());
400 this->session=&session;
401 }
402 ~Channel(){
403 ssh_channel_free(channel);
404 channel=NULL;
405 }
406
415 Channel *acceptX11(int timeout_ms){
416 ssh_channel x11chan = ssh_channel_accept_x11(channel,timeout_ms);
417 ssh_throw_null(getCSession(),x11chan);
418 Channel *newchan = new Channel(getSession(),x11chan);
419 return newchan;
420 }
427 void_throwable changePtySize(int cols, int rows){
428 int err=ssh_channel_change_pty_size(channel,cols,rows);
429 ssh_throw(err);
430 return_throwable;
431 }
432
437 void_throwable close(){
438 ssh_throw(ssh_channel_close(channel));
439 return_throwable;
440 }
441
442 int getExitStatus(){
443 return ssh_channel_get_exit_status(channel);
444 }
445 Session &getSession(){
446 return *session;
447 }
451 bool isClosed(){
452 return ssh_channel_is_closed(channel) != 0;
453 }
457 bool isEof(){
458 return ssh_channel_is_eof(channel) != 0;
459 }
463 bool isOpen(){
464 return ssh_channel_is_open(channel) != 0;
465 }
466 int openForward(const char *remotehost, int remoteport,
467 const char *sourcehost=NULL, int localport=0){
468 int err=ssh_channel_open_forward(channel,remotehost,remoteport,
469 sourcehost, localport);
470 ssh_throw(err);
471 return err;
472 }
473 /* TODO: completely remove this ? */
474 void_throwable openSession(){
475 int err=ssh_channel_open_session(channel);
476 ssh_throw(err);
477 return_throwable;
478 }
479 int poll(bool is_stderr=false){
480 int err=ssh_channel_poll(channel,is_stderr);
481 ssh_throw(err);
482 return err;
483 }
484 int read(void *dest, size_t count, bool is_stderr){
485 int err;
486 /* handle int overflow */
487 if(count > 0x7fffffff)
488 count = 0x7fffffff;
489 err=ssh_channel_read_timeout(channel,dest,count,is_stderr,-1);
490 ssh_throw(err);
491 return err;
492 }
493 int read(void *dest, size_t count, int timeout){
494 int err;
495 /* handle int overflow */
496 if(count > 0x7fffffff)
497 count = 0x7fffffff;
498 err=ssh_channel_read_timeout(channel,dest,count,false,timeout);
499 ssh_throw(err);
500 return err;
501 }
502 int read(void *dest, size_t count, bool is_stderr=false, int timeout=-1){
503 int err;
504 /* handle int overflow */
505 if(count > 0x7fffffff)
506 count = 0x7fffffff;
507 err=ssh_channel_read_timeout(channel,dest,count,is_stderr,timeout);
508 ssh_throw(err);
509 return err;
510 }
511 int readNonblocking(void *dest, size_t count, bool is_stderr=false){
512 int err;
513 /* handle int overflow */
514 if(count > 0x7fffffff)
515 count = 0x7fffffff;
516 err=ssh_channel_read_nonblocking(channel,dest,count,is_stderr);
517 ssh_throw(err);
518 return err;
519 }
520 void_throwable requestEnv(const char *name, const char *value){
521 int err=ssh_channel_request_env(channel,name,value);
522 ssh_throw(err);
523 return_throwable;
524 }
525
526 void_throwable requestExec(const char *cmd){
527 int err=ssh_channel_request_exec(channel,cmd);
528 ssh_throw(err);
529 return_throwable;
530 }
531 void_throwable requestPty(const char *term=NULL, int cols=0, int rows=0){
532 int err;
533 if(term != NULL && cols != 0 && rows != 0)
534 err=ssh_channel_request_pty_size(channel,term,cols,rows);
535 else
536 err=ssh_channel_request_pty(channel);
537 ssh_throw(err);
538 return_throwable;
539 }
540
541 void_throwable requestShell(){
542 int err=ssh_channel_request_shell(channel);
543 ssh_throw(err);
544 return_throwable;
545 }
546 void_throwable requestSendSignal(const char *signum){
547 int err=ssh_channel_request_send_signal(channel, signum);
548 ssh_throw(err);
549 return_throwable;
550 }
551 void_throwable requestSubsystem(const char *subsystem){
552 int err=ssh_channel_request_subsystem(channel,subsystem);
553 ssh_throw(err);
554 return_throwable;
555 }
556 int requestX11(bool single_connection,
557 const char *protocol, const char *cookie, int screen_number){
558 int err=ssh_channel_request_x11(channel,single_connection,
559 protocol, cookie, screen_number);
560 ssh_throw(err);
561 return err;
562 }
563 void_throwable sendEof(){
564 int err=ssh_channel_send_eof(channel);
565 ssh_throw(err);
566 return_throwable;
567 }
577 int write(const void *data, size_t len, bool is_stderr=false){
578 int ret;
579 if(is_stderr){
580 ret=ssh_channel_write_stderr(channel,data,len);
581 } else {
582 ret=ssh_channel_write(channel,data,len);
583 }
584 ssh_throw(ret);
585 return ret;
586 }
587 private:
588 ssh_session getCSession(){
589 return session->getCSession();
590 }
591 Channel (Session &session, ssh_channel c_channel){
592 this->channel=c_channel;
593 this->session=&session;
594 }
595 Session *session;
596 ssh_channel channel;
597 /* No copy and no = operator */
598 Channel(const Channel &);
599 Channel &operator=(const Channel &);
600 };
601
602
603 inline Channel *Session::acceptForward(int timeout_ms){
604 ssh_channel forward =
605 ssh_channel_accept_forward(c_session, timeout_ms, NULL);
606 ssh_throw_null(c_session,forward);
607 Channel *newchan = new Channel(*this,forward);
608 return newchan;
609 }
610
611 } // namespace ssh
612
614 #endif /* LIBSSHPP_HPP_ */
ssh::Session::userauthNone
int userauthNone()
Authenticates using the "none" method.
Definition: libsshpp.hpp:192
ssh::Session::getAuthList
int getAuthList()
Returns the available authentication methods from the server.
Definition: libsshpp.hpp:238
ssh
Definition: libsshpp.hpp:61
ssh_channel_read_timeout
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:2627
ssh::Session::connect
void connect()
connects to the remote host
Definition: libsshpp.hpp:170
ssh_options_parse_config
int ssh_options_parse_config(ssh_session session, const char *filename)
Parse the ssh config file.
Definition: options.c:1200
ssh::Channel::acceptX11
Channel * acceptX11(int timeout_ms)
accept an incoming X11 connection
Definition: libsshpp.hpp:415
ssh_channel_request_x11
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:1864
ssh_channel_request_shell
int ssh_channel_request_shell(ssh_channel channel)
Request a shell.
Definition: channels.c:1754
ssh_channel_open_forward
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:937
ssh_channel_is_eof
int ssh_channel_is_eof(ssh_channel channel)
Check if remote has sent an EOF.
Definition: channels.c:1412
ssh::Session::isServerKnown
int isServerKnown()
verifies that the server is known
Definition: libsshpp.hpp:308
ssh_channel_send_eof
int ssh_channel_send_eof(ssh_channel channel)
Send an end of file on the channel.
Definition: channels.c:1065
ssh::Channel::close
void close()
closes a channel
Definition: libsshpp.hpp:437
ssh_channel_close
int ssh_channel_close(ssh_channel channel)
Close a channel.
Definition: channels.c:1117
ssh::Session::userauthPublickey
int userauthPublickey(ssh_key privkey)
Authenticates using the publickey method.
Definition: libsshpp.hpp:226
ssh::Session::getVersion
int getVersion()
returns the version of the SSH protocol being used
Definition: libsshpp.hpp:299
ssh::Session
The ssh::Session class contains the state of a SSH connection.
Definition: libsshpp.hpp:126
ssh_channel_write_stderr
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:3176
ssh_get_openssh_version
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:613
ssh_userauth_list
int ssh_userauth_list(ssh_session session, const char *username)
Get available authentication methods from the server.
Definition: auth.c:318
ssh_get_error
const char * ssh_get_error(void *error)
Retrieve the error text message from the last error.
Definition: error.c:111
ssh_channel_write
int ssh_channel_write(ssh_channel channel, const void *data, uint32_t len)
Blocking write on a channel.
Definition: channels.c:1369
ssh_channel_request_pty_size
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:1618
ssh_channel_request_subsystem
int ssh_channel_request_subsystem(ssh_channel channel, const char *subsystem)
Request a subsystem (for example "sftp").
Definition: channels.c:1780
ssh::Channel
the ssh::Channel class describes the state of an SSH channel.
Definition: libsshpp.hpp:395
ssh_get_version
int ssh_get_version(ssh_session session)
Get the protocol version of the session.
Definition: session.c:783
ssh_channel_request_env
int ssh_channel_request_env(ssh_channel channel, const char *name, const char *value)
Set environment variables.
Definition: channels.c:2298
ssh::Session::userauthPublickeyAuto
int userauthPublickeyAuto(void)
Authenticates automatically using public key.
Definition: libsshpp.hpp:180
ssh_get_issue_banner
char * ssh_get_issue_banner(ssh_session session)
Get the issue banner from the server.
Definition: client.c:587
ssh::Channel::write
int write(const void *data, size_t len, bool is_stderr=false)
Writes on a channel.
Definition: libsshpp.hpp:577
ssh::Channel::changePtySize
void changePtySize(int cols, int rows)
change the size of a pseudoterminal
Definition: libsshpp.hpp:427
ssh::Session::getIssueBanner
std::string getIssueBanner()
gets the Issue banner from the ssh server
Definition: libsshpp.hpp:282
ssh_options_copy
int ssh_options_copy(ssh_session src, ssh_session *dest)
Duplicate the options of a session structure.
Definition: options.c:64
ssh::Session::disconnect
void disconnect()
Disconnects from the SSH server and closes connection.
Definition: libsshpp.hpp:246
ssh::SshException::getCode
int getCode()
returns the Error code
Definition: libsshpp.hpp:89
ssh_channel_open_session
int ssh_channel_open_session(ssh_channel channel)
Open a session channel (suited for a shell, not TCP forwarding).
Definition: channels.c:860
ssh::SshException
Some people do not like C++ exceptions.
Definition: libsshpp.hpp:74
ssh_channel_is_open
int ssh_channel_is_open(ssh_channel channel)
Check if the channel is open or not.
Definition: channels.c:1382
ssh_write_knownhost
int ssh_write_knownhost(ssh_session session)
Write the current server as known in the known hosts file.
Definition: known_hosts.c:526
ssh_channel_is_closed
int ssh_channel_is_closed(ssh_channel channel)
Check if the channel is closed or not.
Definition: channels.c:1398
ssh::Session::getSocket
socket_t getSocket()
returns the file descriptor used for the communication
Definition: libsshpp.hpp:275
ssh::Session::optionsParseConfig
void optionsParseConfig(const char *file)
parses a configuration file for options
Definition: libsshpp.hpp:336
ssh::Session::setOption
void setOption(enum ssh_options_e type, void *option)
sets an SSH session options
Definition: libsshpp.hpp:162
ssh_channel_poll
int ssh_channel_poll(ssh_channel channel, int is_stderr)
Polls a channel for data to read.
Definition: channels.c:2789
ssh::Session::writeKnownhost
int writeKnownhost()
Writes the known host file with current host key.
Definition: libsshpp.hpp:351
ssh_channel_new
ssh_channel ssh_channel_new(ssh_session session)
Allocate a new channel.
Definition: channels.c:79
ssh_options_set
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:382
ssh_userauth_password
int ssh_userauth_password(ssh_session session, const char *username, const char *password)
Try to authenticate by password.
Definition: auth.c:1109
ssh_userauth_publickey_auto
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:893
ssh_userauth_publickey
int ssh_userauth_publickey(ssh_session session, const char *username, const ssh_key privkey)
Authenticate with public/private key.
Definition: auth.c:550
ssh_get_fd
socket_t ssh_get_fd(ssh_session session)
Get the fd of a connection.
Definition: session.c:516
ssh::Session::userauthPassword
int userauthPassword(const char *password)
Authenticates using the password method.
Definition: libsshpp.hpp:203
ssh::Channel::isEof
bool isEof()
returns true if channel is in EOF state
Definition: libsshpp.hpp:457
ssh_channel_change_pty_size
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:1707
ssh_connect
int ssh_connect(ssh_session session)
Connect to the ssh server.
Definition: client.c:469
ssh_disconnect
void ssh_disconnect(ssh_session session)
Disconnect from a session (client or server).
Definition: client.c:627
ssh::Session::getOpensshVersion
int getOpensshVersion()
returns the OpenSSH version (server) if possible
Definition: libsshpp.hpp:292
ssh::Channel::isClosed
bool isClosed()
returns true if channel is in closed state
Definition: libsshpp.hpp:451
ssh_userauth_none
int ssh_userauth_none(ssh_session session, const char *username)
Try to authenticate through the "none" method.
Definition: auth.c:354
ssh_channel_accept_x11
ssh_channel ssh_channel_accept_x11(ssh_channel channel, int timeout_ms)
Accept an X11 forwarding channel.
Definition: channels.c:1980
ssh_channel_listen_forward
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:2165
ssh_channel_request_send_signal
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:2443
ssh::SshException::getError
std::string getError()
returns the error message of the last exception
Definition: libsshpp.hpp:96
ssh_channel_accept_forward
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:2228
ssh::Session::userauthTryPublickey
int userauthTryPublickey(ssh_key pubkey)
Try to authenticate using the publickey method.
Definition: libsshpp.hpp:215
ssh::Session::silentDisconnect
void silentDisconnect()
silently disconnect from remote host
Definition: libsshpp.hpp:343
ssh::Session::acceptForward
Channel * acceptForward(int timeout_ms)
accept an incoming forward connection
Definition: libsshpp.hpp:603
ssh_channel_request_exec
int ssh_channel_request_exec(ssh_channel channel, const char *cmd)
Run a shell command without an interactive shell.
Definition: channels.c:2368
ssh::Channel::isOpen
bool isOpen()
returns true if channel is in open state
Definition: libsshpp.hpp:463
ssh_channel_request_pty
int ssh_channel_request_pty(ssh_channel channel)
Request a PTY.
Definition: channels.c:1688
ssh_silent_disconnect
void ssh_silent_disconnect(ssh_session session)
Disconnect impolitely from a remote host by closing the socket.
Definition: session.c:417
ssh::Session::setOption
void setOption(enum ssh_options_e type, long int option)
sets an SSH session options
Definition: libsshpp.hpp:152
ssh_get_disconnect_message
const char * ssh_get_disconnect_message(ssh_session session)
Get the disconnect message from the server.
Definition: session.c:758
ssh_new
ssh_session ssh_new(void)
Create a new ssh session.
Definition: session.c:58
ssh_channel_free
void ssh_channel_free(ssh_channel channel)
Close and free a channel.
Definition: channels.c:993
ssh_userauth_try_publickey
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:441
ssh_is_server_known
int ssh_is_server_known(ssh_session session)
Check if the server is known.
Definition: known_hosts.c:406
ssh::Session::setOption
void setOption(enum ssh_options_e type, const char *option)
sets an SSH session options
Definition: libsshpp.hpp:142
ssh_channel_get_exit_status
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:2918
ssh_channel_cancel_forward
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:2247
ssh::Session::getDisconnectMessage
const char * getDisconnectMessage()
Returns the disconnect message from the server, if any.
Definition: libsshpp.hpp:253
ssh::Session::optionsCopy
void optionsCopy(const Session &source)
copies options from a session to another
Definition: libsshpp.hpp:327
ssh_free
void ssh_free(ssh_session session)
Deallocate a SSH session handle.
Definition: session.c:172
ssh_channel_read_nonblocking
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:2737
ssh_get_error_code
int ssh_get_error_code(void *error)
Retrieve the error code from the last error.
Definition: error.c:131