#include <libssh2.h>

#include <netinet/in.h>
#include <sys/socket.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <ctype.h>


const char *username="username";
const char *password="password";

int main(int argc, char *argv[])
{
    unsigned long hostaddr;
    int sock, i, auth_pw = 0;
    struct sockaddr_in sin;
    const char *fingerprint;
    char *userauthlist;
    LIBSSH2_SESSION *session;
    LIBSSH2_CHANNEL *channel;

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

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

    /* 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);
#ifndef WIN32
    fcntl(sock, F_SETFL, 0);
#endif
    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_startup(session, sock)) {
        fprintf(stderr, "Failure establishing SSH session\n");
        return -1;
    }

    libssh2_trace(session
            , LIBSSH2_TRACE_ERROR | LIBSSH2_TRACE_CONN | LIBSSH2_TRACE_TRANS);

    /* 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");
    }

    /* 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;
    }

    libssh2_channel_write(channel, "/bin/mkdir /tmp/foo\r\n", 21);

    /*sleep(2);*/

    libssh2_channel_close(channel);
    libssh2_channel_wait_closed(channel);

  skip_shell:
    if (channel) {
        libssh2_channel_free(channel);
        channel = NULL;
    }

  shutdown:

    libssh2_session_disconnect(session, "Normal Shutdown, Thank you for playing");
    libssh2_session_free(session);

    sleep(1);
    close(sock);
    printf("all done!\n");
    return 0;
}