/*


Sample showing how to do SSH2 connect.
*
The sample code has default values for host name, user name, password
and path to copy, but you can specify them on the command line like:
*
"ssh2 host user password [-p|-i|-k]"
*/

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>
const char keyfile1="~/.ssh/id_rsa.pub";
const char keyfile2="~/.ssh/id_rsa";
const char username="username";
const char password="password";
static void kbd_callback(const char name, int name_len,
                         const char instruction, int instruction_len,
                         int num_prompts,
                         const LIBSSH2_USERAUTH_KBDINT_PROMPT prompts,
                         LIBSSH2_USERAUTH_KBDINT_RESPONSE responses,
                         void *abstract)
{
    (void)name;
    (void)name_len;
    (void)instruction;
    (void)instruction_len;
    if (num_prompts == 1) {
        responses[0].text = strdup(password);
        responses[0].length = strlen(password);
    }
    (void)prompts;
    (void)abstract;
} / kbd_callback */
int main(int argc, char argv[])
{
    unsigned long hostaddr;
    int rc, sock, i, auth_pw = 0;
    struct sockaddr_in sin;
    const char fingerprint;
    char userauthlist;
    LIBSSH2_SESSION session;
    LIBSSH2_CHANNEL *channel;
ifdef WIN32

WSADATA wsadata;

WSAStartup(MAKEWORD(2,0), &wsadata);

endif

if (argc > 1) {
    hostaddr = inet_addr(argv[1]);
} else {
    hostaddr = htonl(0x7F000001);
}

if(argc > 2) {
    username = argv[2];
}
if(argc > 3) {
    password = argv[3];
}

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);

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 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);

printf("Fingerprint: ");
for(i = 0; i < 20; i++) {
    printf("%02X ", (unsigned char)fingerprint[i]);
}
printf("\n");

/* check what authentication methods are available */
userauthlist = libssh2_userauth_list(session, username, strlen(username));

printf("Authentication methods: %s\n", userauthlist);
if (strstr(userauthlist, "password") != NULL) {
    auth_pw |= 1;
}
if (strstr(userauthlist, "keyboard-interactive") != NULL) {
    auth_pw |= 2;
}
if (strstr(userauthlist, "publickey") != NULL) {
    auth_pw |= 4;
}

/* if we got an 4. argument we set this option if supported */
if(argc > 4) {
    if ((auth_pw & 1) && !strcasecmp(argv[4], "-p")) {
        auth_pw = 1;
    }
    if ((auth_pw & 2) && !strcasecmp(argv[4], "-i")) {
        auth_pw = 2;
    }
    if ((auth_pw & 4) && !strcasecmp(argv[4], "-k")) {
        auth_pw = 4;
    }
}

if (auth_pw & 1) {
    /* We could authenticate via password */
    if (libssh2_userauth_password(session, username, password)) {

        printf("\tAuthentication by password failed!\n");
        goto shutdown;
    } else {
        printf("\tAuthentication by password succeeded.\n");
    }
} else if (auth_pw & 2) {
    /* Or via keyboard-interactive */
    if (libssh2_userauth_keyboard_interactive(session, username,

                                              &kbd_callback) ) {
        printf("\tAuthentication by keyboard-interactive failed!\n");
        goto shutdown;
    } else {
        printf("\tAuthentication by keyboard-interactive succeeded.\n");
    }
} else if (auth_pw & 4) {
    /* Or by public key */
    if (libssh2_userauth_publickey_fromfile(session, username, keyfile1,

                                            keyfile2, password)) {
        printf("\tAuthentication by public key failed!\n");
        goto shutdown;
    } else {
        printf("\tAuthentication by public key succeeded.\n");
    }
} else {
    printf("No supported authentication methods found!\n");
    goto shutdown;
}

/* Request a shell */
if (!(channel = libssh2_channel_open_session(session))) {

    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_recv()
 * libssh2_channel_direct_tcpip()
 */


shutdown:

libssh2_session_disconnect(session,

                           "Normal Shutdown, Thank you for playing");
libssh2_session_free(session);



ifdef WIN32

closesocket(sock);

else

close(sock);

endif

printf("all done!\n");

libssh2_exit();


return 0;

}</pre>