ssh_connect.c

/*
 * MIT License
 *
 * Copyright (c) 2018 Lewis Van Winkle
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "chap11.h"

int main(int argc, char *argv[])
{
    const char *hostname = 0;
    int port = 22;
    if (argc < 2) {
        fprintf(stderr, "Usage: ssh_connect hostname port\n");
        return 1;
    }
    hostname = argv[1];
    if (argc > 2) port = atol(argv[2]);


    ssh_session ssh = ssh_new();
    if (!ssh) {
        fprintf(stderr, "ssh_new() failed.\n");
        return 1;
    }

    ssh_options_set(ssh, SSH_OPTIONS_HOST, hostname);
    ssh_options_set(ssh, SSH_OPTIONS_PORT, &port);

    int verbosity = SSH_LOG_PROTOCOL;
    ssh_options_set(ssh, SSH_OPTIONS_LOG_VERBOSITY, &verbosity);

    int ret = ssh_connect(ssh);
    if (ret != SSH_OK) {
        fprintf(stderr, "ssh_connect() failed.\n%s\n", ssh_get_error(ssh));
        return -1;
    }

    printf("Connected to %s on port %d.\n", hostname, port);

    printf("Banner:\n%s\n", ssh_get_serverbanner(ssh));

    ssh_disconnect(ssh);
    ssh_free(ssh);

    return 0;
}