Added ssh2_exec as a new example, showing how to run a command remotely with
libssh2
This commit is contained in:
Daniel Stenberg
parent
9412588373
commit
755e213ae6
@ -8,7 +8,7 @@ noinst_PROGRAMS = ssh2 \
|
||||
sftp_write sftp_write_nonblock \
|
||||
sftp_mkdir sftp_mkdir_nonblock \
|
||||
sftp_RW_nonblock \
|
||||
sftpdir sftpdir_nonblock
|
||||
sftpdir sftpdir_nonblock ssh2_exec
|
||||
|
||||
# the examples need the $(top_builddir)/src since when building outside of the
|
||||
# source dir they still need to reach the libssh2_config.h header
|
||||
|
||||
251
example/simple/ssh2_exec.c
Normal file
251
example/simple/ssh2_exec.c
Normal file
@ -0,0 +1,251 @@
|
||||
/*
|
||||
* $Id: ssh2_exec.c,v 1.1 2009/05/05 12:27:02 bagder Exp $
|
||||
*
|
||||
* Sample showing how to use libssh2 to execute a command remotely.
|
||||
*
|
||||
* The sample code has fixed values for host name, user name, password
|
||||
* and command to run. Change them to something suitable.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <netinet/in.h>
|
||||
#include <sys/socket.h>
|
||||
#include <arpa/inet.h>
|
||||
#include <sys/time.h>
|
||||
#include <sys/types.h>
|
||||
#include <unistd.h>
|
||||
#include <stdlib.h>
|
||||
#include <fcntl.h>
|
||||
#include <errno.h>
|
||||
#include <stdio.h>
|
||||
#include <ctype.h>
|
||||
|
||||
#include <libssh2.h>
|
||||
|
||||
|
||||
static int waitsocket(int socket_fd, LIBSSH2_SESSION *session)
|
||||
{
|
||||
struct timeval timeout;
|
||||
int rc;
|
||||
fd_set fd;
|
||||
fd_set *writefd = NULL;
|
||||
fd_set *readfd = NULL;
|
||||
int dir;
|
||||
|
||||
timeout.tv_sec = 10;
|
||||
timeout.tv_usec = 0;
|
||||
|
||||
FD_ZERO(&fd);
|
||||
|
||||
FD_SET(socket_fd, &fd);
|
||||
|
||||
/* now make sure we wait in the correct direction */
|
||||
dir = libssh2_session_block_directions(session);
|
||||
|
||||
if(dir & LIBSSH2_SESSION_BLOCK_INBOUND)
|
||||
readfd = &fd;
|
||||
|
||||
if(dir & LIBSSH2_SESSION_BLOCK_OUTBOUND)
|
||||
writefd = &fd;
|
||||
|
||||
rc = select(socket_fd + 1, readfd, writefd, NULL, &timeout);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
const char *remotehost = "127.0.0.1";
|
||||
const char *commandline = "uptime";
|
||||
const char *username = "user";
|
||||
const char *password = "password";
|
||||
unsigned long hostaddr;
|
||||
int sock, i;
|
||||
struct sockaddr_in sin;
|
||||
const char *fingerprint;
|
||||
LIBSSH2_SESSION *session;
|
||||
LIBSSH2_CHANNEL *channel;
|
||||
int rc;
|
||||
int exitcode;
|
||||
int bytecount = 0;
|
||||
|
||||
#ifdef WIN32
|
||||
WSADATA wsadata;
|
||||
WSAStartup(MAKEWORD(2,0), &wsadata);
|
||||
#endif
|
||||
(void)argv;
|
||||
(void)argc;
|
||||
|
||||
hostaddr = inet_addr( remotehost );
|
||||
|
||||
/* 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);
|
||||
|
||||
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");
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* We set the socket non-blocking. We do it after the connect just to
|
||||
simplify the example code. */
|
||||
#ifdef F_SETFL
|
||||
/* FIXME: this can/should be done in a more portable manner */
|
||||
rc = fcntl(sock, F_GETFL, 0);
|
||||
fcntl(sock, F_SETFL, rc | O_NONBLOCK);
|
||||
#elif defined(HAVE_IOCTLSOCKET)
|
||||
ioctlsocket(sock, FIONBIO, &flag);
|
||||
#else
|
||||
#ifdef WIN32
|
||||
u_long mode = 1;
|
||||
ioctlsocket (sock, FIONBIO, &mode);
|
||||
#else
|
||||
#error "add support for setting the socket non-blocking here"
|
||||
#endif
|
||||
#endif
|
||||
|
||||
/* Create a session instance */
|
||||
session = libssh2_session_init();
|
||||
if (!session)
|
||||
return -1;
|
||||
|
||||
/* Since we have set non-blocking, tell libssh2 we are non-blocking */
|
||||
libssh2_session_set_blocking(session, 0);
|
||||
|
||||
/* ... start it up. This will trade welcome banners, exchange keys,
|
||||
* and setup crypto, compression, and MAC layers
|
||||
*/
|
||||
while ((rc = libssh2_session_startup(session, sock)) ==
|
||||
LIBSSH2_ERROR_EAGAIN);
|
||||
if (rc) {
|
||||
fprintf(stderr, "Failure establishing SSH session: %d\n", rc);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* At this point we havn't yet 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_MD5);
|
||||
fprintf(stderr, "Fingerprint: ");
|
||||
for(i = 0; i < 16; i++) {
|
||||
fprintf(stderr, "%02X ", (unsigned char)fingerprint[i]);
|
||||
}
|
||||
fprintf(stderr, "\n");
|
||||
|
||||
if ( strlen(password) != 0 ) {
|
||||
/* We could authenticate via password */
|
||||
while ((rc = libssh2_userauth_password(session, username, password)) ==
|
||||
LIBSSH2_ERROR_EAGAIN);
|
||||
if (rc) {
|
||||
fprintf(stderr, "Authentication by password failed.\n");
|
||||
goto shutdown;
|
||||
}
|
||||
}
|
||||
else {
|
||||
/* Or by public key */
|
||||
while ((rc = libssh2_userauth_publickey_fromfile(session, username,
|
||||
"/home/user/"
|
||||
".ssh/id_rsa.pub",
|
||||
"/home/user/"
|
||||
".ssh/id_rsa",
|
||||
password)) ==
|
||||
LIBSSH2_ERROR_EAGAIN);
|
||||
if (rc) {
|
||||
fprintf(stderr, "\tAuthentication by public key failed\n");
|
||||
goto shutdown;
|
||||
}
|
||||
}
|
||||
|
||||
#if 0
|
||||
libssh2_trace(session, ~0 );
|
||||
#endif
|
||||
|
||||
/* Exec non-blocking on the remove host */
|
||||
while( (channel = libssh2_channel_open_session(session)) == NULL &&
|
||||
libssh2_session_last_error(session,NULL,NULL,0) ==
|
||||
LIBSSH2_ERROR_EAGAIN )
|
||||
{
|
||||
waitsocket(sock, session);
|
||||
}
|
||||
if( channel == NULL )
|
||||
{
|
||||
fprintf(stderr,"Error\n");
|
||||
exit( 1 );
|
||||
}
|
||||
while( (rc = libssh2_channel_exec(channel, commandline)) ==
|
||||
LIBSSH2_ERROR_EAGAIN )
|
||||
{
|
||||
waitsocket(sock, session);
|
||||
}
|
||||
if( rc != 0 )
|
||||
{
|
||||
fprintf(stderr,"Error\n");
|
||||
exit( 1 );
|
||||
}
|
||||
for( ;; )
|
||||
{
|
||||
/* loop until we block */
|
||||
int rc;
|
||||
do
|
||||
{
|
||||
char buffer[0x4000];
|
||||
rc = libssh2_channel_read( channel, buffer, sizeof(buffer) );
|
||||
if( rc > 0 )
|
||||
{
|
||||
int i;
|
||||
bytecount += rc;
|
||||
fprintf(stderr, "We read:\n");
|
||||
for( i=0; i < rc; ++i )
|
||||
fputc( buffer[i], stderr);
|
||||
fprintf(stderr, "\n");
|
||||
}
|
||||
else {
|
||||
fprintf(stderr, "libssh2_channel_read returned %d\n", rc);
|
||||
}
|
||||
}
|
||||
while( rc > 0 );
|
||||
|
||||
/* this is due to blocking that would occur otherwise so we loop on
|
||||
this condition */
|
||||
if( rc == LIBSSH2_ERROR_EAGAIN )
|
||||
{
|
||||
waitsocket(sock, session);
|
||||
}
|
||||
else
|
||||
break;
|
||||
}
|
||||
exitcode = 127;
|
||||
while( (rc = libssh2_channel_close(channel)) == LIBSSH2_ERROR_EAGAIN )
|
||||
;
|
||||
if( rc == 0 )
|
||||
{
|
||||
exitcode = libssh2_channel_get_exit_status( channel );
|
||||
}
|
||||
printf("\nEXIT: %d bytecount: %d\n", exitcode, bytecount);
|
||||
|
||||
libssh2_channel_free(channel);
|
||||
channel = NULL;
|
||||
|
||||
shutdown:
|
||||
|
||||
libssh2_session_disconnect(session,
|
||||
"Normal Shutdown, Thank you for playing");
|
||||
libssh2_session_free(session);
|
||||
|
||||
#ifdef WIN32
|
||||
closesocket(sock);
|
||||
#else
|
||||
close(sock);
|
||||
#endif
|
||||
fprintf(stderr, "all done\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user