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libssh2_auth.c
146 lines (126 loc) · 3.42 KB
/
libssh2_auth.c
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/* [Thu May 31, 2012]: Adapted from libssh2/example/ssh2_exec.c */
/*
* 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.
*
* Run it like this:
*
* $ ./ssh2_exec 127.0.0.1 user password "uptime"
*
*/
#include <libssh2.h>
#ifdef WIN32
#else
#define HAVE_SYS_SOCKET_H 1
#define HAVE_NETINET_IN_H 1
#define HAVE_SYS_SELECT_H 1
#define HAVE_UNISTD_H 1
#define HAVE_ARPA_INET_H 1
#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_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>
#include "strbuf.h"
int ssh2_auth(const char *hostip,
const char *username,
const char *password,
char **errmsg)
{
unsigned long hostaddr;
int sock;
struct sockaddr_in sin;
LIBSSH2_SESSION *session;
int rc;
LIBSSH2_KNOWNHOSTS *nh;
struct StringBuffer *sberrmsg = new_string_buffer();
#ifdef WIN32
WSADATA wsadata;
WSAStartup(MAKEWORD(2,0), &wsadata);
#endif
rc = libssh2_init (0);
if (rc != 0) {
sbprintf (sberrmsg, "libssh2 initialization failed (%d)\n", rc);
*errmsg = free_string_buffer(sberrmsg, 0);
return 1;
}
hostaddr = inet_addr(hostip);
/* 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) {
sbprintf(sberrmsg, "failed to connect!\n");
*errmsg = free_string_buffer(sberrmsg, 0);
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) {
sbprintf(sberrmsg, "Failure establishing SSH session: %d\n", rc);
*errmsg = free_string_buffer(sberrmsg, 0);
return -1;
}
nh = libssh2_knownhost_init(session);
if(!nh) {
/* eeek, do cleanup here */
return 2;
}
/* We could authenticate via password */
while ((rc = libssh2_userauth_password(session, username, password)) ==
LIBSSH2_ERROR_EAGAIN);
if (rc) {
sbprintf(sberrmsg, "Authentication by password failed.\n");
*errmsg = free_string_buffer(sberrmsg, 0);
}
else {
free_string_buffer(sberrmsg, 1);
}
libssh2_session_disconnect(session,
"Normal Shutdown, Thank you for playing");
libssh2_session_free(session);
#ifdef WIN32
closesocket(sock);
#else
close(sock);
#endif
libssh2_exit();
return rc;
}