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ssh2-python/libssh2/example/ssh2_agent.c at callbacks · ParallelSSH/ssh2-python · GitHub
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libssh2
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ssh2_agent.c
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ssh2-python
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libssh2
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example
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ssh2_agent.c
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/*
* Sample showing how to do SSH2 connect using ssh-agent.
*
* The sample code has default values for host name, user name:
*
* "ssh2_agent host user"
*/
#include
"libssh2_config.h"
#include
<libssh2.h>
#include
<libssh2_sftp.h>
#ifdef
HAVE_WINDOWS_H
# include
<windows.h>
#endif
#ifdef
HAVE_WINSOCK2_H
# include
<winsock2.h>
#endif
#ifdef
HAVE_SYS_SOCKET_H
# include
<sys/socket.h>
#endif
#ifdef
HAVE_NETINET_IN_H
# include
<netinet/in.h>
#endif
# ifdef
HAVE_UNISTD_H
#include
<unistd.h>
#endif
# ifdef
HAVE_ARPA_INET_H
#include
<arpa/inet.h>
#endif
#include
<sys/types.h>
#include
<fcntl.h>
#include
<errno.h>
#include
<stdio.h>
#include
<ctype.h>
#include
<stdlib.h>
const
char
*
username
=
"username"
;
int
main
(
int
argc
,
char
*
argv
[])
{
unsigned long
hostaddr
;
int
sock
=
-1
,
i
,
rc
;
struct
sockaddr_in
sin
;
const
char
*
fingerprint
;
char
*
userauthlist
;
LIBSSH2_SESSION
*
session
=
NULL
;
LIBSSH2_CHANNEL
*
channel
;
LIBSSH2_AGENT
*
agent
=
NULL
;
struct
libssh2_agent_publickey
*
identity
,
*
prev_identity
=
NULL
;
#ifdef
WIN32
WSADATA
wsadata
;
int
err
;
err
=
WSAStartup
(
MAKEWORD
(
2
,
0
),
&
wsadata
);
if
(
err
!=
0
) {
fprintf
(
stderr
,
"WSAStartup failed with error: %d\n"
,
err
);
return
1
;
}
#endif
if
(
argc
>
1
) {
hostaddr
=
inet_addr
(
argv
[
1
]);
}
else
{
hostaddr
=
htonl
(
0x7F000001
);
}
if
(
argc
>
2
) {
username
=
argv
[
2
];
}
rc
=
libssh2_init
(
0
);
if
(
rc
!=
0
) {
fprintf
(
stderr
,
"libssh2 initialization failed (%d)\n"
,
rc
);
return
1
;
}
/* Ultra basic "connect to port 22 on localhost". Your code is
* responsible for creating the socket establishing the connection
*/
sock
=
socket
(
AF_INET
,
SOCK_STREAM
,
0
);
if
(
sock
==
-1
) {
fprintf
(
stderr
,
"failed to create socket!\n"
);
rc
=
1
;
goto
shutdown
;
}
sin
.
sin_family
=
AF_INET
;
sin
.
sin_port
=
htons
(
22
);
sin
.
sin_addr
.
s_addr
=
hostaddr
;
if
(
connect
(
sock
, (
struct
sockaddr
*
)(
&
sin
),
sizeof
(
struct
sockaddr_in
))
!=
0
) {
fprintf
(
stderr
,
"failed to connect!\n"
);
goto
shutdown
;
}
/* Create a session instance and start it up. This will trade welcome
* banners, exchange keys, and setup crypto, compression, and MAC layers
*/
session
=
libssh2_session_init
();
if
(
libssh2_session_handshake
(
session
,
sock
)) {
fprintf
(
stderr
,
"Failure establishing SSH session\n"
);
return
1
;
}
/* At this point we havn't authenticated. The first thing to do is check
* the hostkey's fingerprint against our known hosts Your app may have it
* hard coded, may go to a file, may present it to the user, that's your
* call
*/
fingerprint
=
libssh2_hostkey_hash
(
session
,
LIBSSH2_HOSTKEY_HASH_SHA1
);
fprintf
(
stderr
,
"Fingerprint: "
);
for
(
i
=
0
;
i
<
20
;
i
++
) {
fprintf
(
stderr
,
"%02X "
, (
unsigned
char
)
fingerprint
[
i
]);
}
fprintf
(
stderr
,
"\n"
);
/* check what authentication methods are available */
userauthlist
=
libssh2_userauth_list
(
session
,
username
,
strlen
(
username
));
fprintf
(
stderr
,
"Authentication methods: %s\n"
,
userauthlist
);
if
(
strstr
(
userauthlist
,
"publickey"
)
==
NULL
) {
fprintf
(
stderr
,
"\"publickey\" authentication is not supported\n"
);
goto
shutdown
;
}
/* Connect to the ssh-agent */
agent
=
libssh2_agent_init
(
session
);
if
(!
agent
) {
fprintf
(
stderr
,
"Failure initializing ssh-agent support\n"
);
rc
=
1
;
goto
shutdown
;
}
if
(
libssh2_agent_connect
(
agent
)) {
fprintf
(
stderr
,
"Failure connecting to ssh-agent\n"
);
rc
=
1
;
goto
shutdown
;
}
if
(
libssh2_agent_list_identities
(
agent
)) {
fprintf
(
stderr
,
"Failure requesting identities to ssh-agent\n"
);
rc
=
1
;
goto
shutdown
;
}
while
(
1
) {
rc
=
libssh2_agent_get_identity
(
agent
,
&
identity
,
prev_identity
);
if
(
rc
==
1
)
break
;
if
(
rc
<
0
) {
fprintf
(
stderr
,
"Failure obtaining identity from ssh-agent support\n"
);
rc
=
1
;
goto
shutdown
;
}
if
(
libssh2_agent_userauth
(
agent
,
username
,
identity
)) {
fprintf
(
stderr
,
"\tAuthentication with username %s and "
"public key %s failed!\n"
,
username
,
identity
->
comment
);
}
else
{
fprintf
(
stderr
,
"\tAuthentication with username %s and "
"public key %s succeeded!\n"
,
username
,
identity
->
comment
);
break
;
}
prev_identity
=
identity
;
}
if
(
rc
) {
fprintf
(
stderr
,
"Couldn't continue authentication\n"
);
goto
shutdown
;
}
/* We're authenticated now. */
/* Request a shell */
channel
=
libssh2_channel_open_session
(
session
);
if
(!
channel
) {
fprintf
(
stderr
,
"Unable to open a session\n"
);
goto
shutdown
;
}
/* Some environment variables may be set,
* It's up to the server which ones it'll allow though
*/
libssh2_channel_setenv
(
channel
,
"FOO"
,
"bar"
);
/* Request a terminal with 'vanilla' terminal emulation
* See /etc/termcap for more options
*/
if
(
libssh2_channel_request_pty
(
channel
,
"vanilla"
)) {
fprintf
(
stderr
,
"Failed requesting pty\n"
);
goto
skip_shell
;
}
/* Open a SHELL on that pty */
if
(
libssh2_channel_shell
(
channel
)) {
fprintf
(
stderr
,
"Unable to request shell on allocated pty\n"
);
goto
shutdown
;
}
/* At this point the shell can be interacted with using
* libssh2_channel_read()
* libssh2_channel_read_stderr()
* libssh2_channel_write()
* libssh2_channel_write_stderr()
*
* Blocking mode may be (en|dis)abled with: libssh2_channel_set_blocking()
* If the server send EOF, libssh2_channel_eof() will return non-0
* To send EOF to the server use: libssh2_channel_send_eof()
* A channel can be closed with: libssh2_channel_close()
* A channel can be freed with: libssh2_channel_free()
*/
skip_shell
:
if
(
channel
) {
libssh2_channel_free
(
channel
);
channel
=
NULL
;
}
/* Other channel types are supported via:
* libssh2_scp_send()
* libssh2_scp_recv2()
* libssh2_channel_direct_tcpip()
*/
shutdown
:
if
(
agent
) {
libssh2_agent_disconnect
(
agent
);
libssh2_agent_free
(
agent
);
}
if
(
session
) {
libssh2_session_disconnect
(
session
,
"Normal Shutdown, Thank you for playing"
);
libssh2_session_free
(
session
);
}
if
(
sock
!=
-1
) {
#ifdef
WIN32
closesocket
(
sock
);
#else
close
(
sock
);
#endif
}
fprintf
(
stderr
,
"all done!\n"
);
libssh2_exit
();
return
rc
;
}
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