OK.
Here it goes, then (attached).
Thanks.
Paulo Caetano
On Thu, May 17, 2012 at 4:06 PM, Peter Stuge <pe...@stuge.se> wrote:
> Paulo Caetano wrote:
>> The code is the same, I've just isolated the channel life cycle &
>> command execution in a separate function, and added code to read a
>> list of commands from a file and execute them sequentially.
>>
>> If you think this is useful/relevant to add to the examples, I'll
>> gladly submit it.
>
> You'll have to submit it before anyone can say if it is
> useful/relevant.
>
>
> //Peter
> _______________________________________________
> libssh2-devel http://cool.haxx.se/cgi-bin/mailman/listinfo/libssh2-devel
/*
* Sample showing how to use libssh2 to execute several commands remotely.
*
* The sample code has fixed values for host name, user name, password
* and command file to run. The fixed value for the command file is
* "cmd_exec.txt".
*
* Run it like this:
*
* $ ./ssh2_multiexec 127.0.0.1 user password "command file"
*
*/
#include "libssh2_config.h"
#include <libssh2.h>
#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_SYS_SELECT_H
# include <sys/select.h>
#endif
# ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#include <sys/time.h>
#include <sys/types.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <ctype.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;
}
void execcmd(const char *commandline, int sock, LIBSSH2_SESSION *session)
{
int rc;
int bytecount = 0;
int exitcode;
char *exitsignal=(char *)"none";
LIBSSH2_CHANNEL *channel = NULL;
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: %i\n", rc);
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
{
if ( rc != LIBSSH2_ERROR_EAGAIN )
{
/* no need to output this for the EAGAIN case */
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 )
waitsocket(sock, session);
if( rc == 0 )
{
exitcode = libssh2_channel_get_exit_status( channel );
libssh2_channel_get_exit_signal(channel, &exitsignal,
NULL, NULL, NULL, NULL, NULL);
}
if (exitsignal)
printf("\nGot signal: %s\n", exitsignal);
else
printf("\nEXIT: %d bytecount: %d\n", exitcode, bytecount);
libssh2_channel_free(channel);
channel = NULL;
}
int main(int argc, char *argv[])
{
const char *hostname = "127.0.0.1";
const char *filename = "cmd_exec.txt";
const char *username = "user";
const char *password = "password";
const char *fingerprint;
char command[81]; // each line can have, at most, 80 chars
int sock;
int rc;
int type;
unsigned long hostaddr;
size_t len;
struct sockaddr_in sin;
LIBSSH2_SESSION *session;
LIBSSH2_KNOWNHOSTS *nh;
FILE *cmd_file = NULL;
#ifdef WIN32
WSADATA wsadata;
WSAStartup(MAKEWORD(2,0), &wsadata);
#endif
/* must be ip address only */
if (argc > 1)
hostname = argv[1];
if (argc > 2)
username = argv[2];
if (argc > 3)
password = argv[3];
if (argc > 4)
filename = argv[4];
rc = libssh2_init (0);
if (rc != 0)
{
fprintf (stderr, "libssh2 initialization failed (%d)\n", rc);
return 1;
}
hostaddr = inet_addr(hostname);
/* 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 (socket == -1)
perror("Create socket");
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;
}
/* Create a session instance */
session = libssh2_session_init();
if (!session)
return -1;
/* tell libssh2 we want it all done 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_handshake(session, sock)) ==
LIBSSH2_ERROR_EAGAIN);
if (rc)
{
fprintf(stderr, "Failure establishing SSH session: %d\n", rc);
return -1;
}
nh = libssh2_knownhost_init(session);
if(!nh)
{
/* eeek, do cleanup here */
return 2;
}
/* read all hosts from here */
libssh2_knownhost_readfile(nh, "known_hosts",
LIBSSH2_KNOWNHOST_FILE_OPENSSH);
/* store all known hosts to here */
libssh2_knownhost_writefile(nh, "dumpfile",
LIBSSH2_KNOWNHOST_FILE_OPENSSH);
fingerprint = libssh2_session_hostkey(session, &len, &type);
if(fingerprint)
{
struct libssh2_knownhost *host;
#if LIBSSH2_VERSION_NUM >= 0x010206
/* introduced in 1.2.6 */
int check = libssh2_knownhost_checkp(nh, hostname, 22,
fingerprint, len,
LIBSSH2_KNOWNHOST_TYPE_PLAIN|
LIBSSH2_KNOWNHOST_KEYENC_RAW,
&host);
#else
/* 1.2.5 or older */
int check = libssh2_knownhost_check(nh, hostname,
fingerprint, len,
LIBSSH2_KNOWNHOST_TYPE_PLAIN|
LIBSSH2_KNOWNHOST_KEYENC_RAW,
&host);
#endif
fprintf(stderr, "Host check: %d, key: %s\n", check,
(check <= LIBSSH2_KNOWNHOST_CHECK_MISMATCH)?
host->key:"<none>");
/*****
* At this point, we could verify that 'check' tells us the key is
* fine or bail out.
*****/
}
else
{
/* eeek, do cleanup here */
return 3;
}
libssh2_knownhost_free(nh);
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
/* open file with commands to execute on the remote server */
cmd_file = fopen(filename, "rt");
if (cmd_file == NULL)
{
perror("Error opening file");
goto shutdown;
}
/* fgets will read the '\n', but that shouldn't be a problem
HOWEVER, LINES WITH 80+ CHARS WILL BE A PROBLEM */
while (fgets(command, 81, cmd_file) != NULL)
{
execcmd(command, sock, session);
}
fclose(cmd_file);
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");
libssh2_exit();
return 0;
}
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