libssh2

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/* Copyright (C) The libssh2 project and its contributors.
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 *
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 * Sample showing how to do SFTP non-blocking mkdir.
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 *
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 * The sample code has default values for host name, user name, password
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 * and path to copy, but you can specify them on the command line like:
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 *
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 * $ ./sftp_mkdir_nonblock 192.168.0.1 user password /tmp/sftp_write_nonblock.c
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 *
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 * SPDX-License-Identifier: BSD-3-Clause
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 */
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#include "libssh2_setup.h"
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#include <libssh2.h>
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#include <libssh2_sftp.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#include <stdio.h>
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static const char *pubkey = "/home/username/.ssh/id_rsa.pub";
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static const char *privkey = "/home/username/.ssh/id_rsa";
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static const char *username = "username";
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static const char *password = "password";
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static const char *sftppath = "/tmp/sftp_mkdir_nonblock";
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int main(int argc, char *argv[])
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{
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    uint32_t hostaddr;
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    libssh2_socket_t sock;
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    int i, auth_pw = 1;
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    struct sockaddr_in sin;
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    const char *fingerprint;
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    int rc;
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    LIBSSH2_SESSION *session = NULL;
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    LIBSSH2_SFTP *sftp_session;
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#ifdef _WIN32
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    WSADATA wsadata;
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    rc = WSAStartup(MAKEWORD(2, 0), &wsadata);
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    if(rc) {
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        fprintf(stderr, "WSAStartup failed with error: %d\n", rc);
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        return 1;
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    }
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#endif
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    if(argc > 1) {
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        hostaddr = inet_addr(argv[1]);
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    }
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    else {
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        hostaddr = htonl(0x7F000001);
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    }
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    if(argc > 2) {
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        username = argv[2];
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    }
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    if(argc > 3) {
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        password = argv[3];
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    }
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    if(argc > 4) {
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        sftppath = argv[4];
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    }
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    rc = libssh2_init(0);
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    if(rc) {
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        fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);
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        return 1;
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    }
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    /*
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     * The application code is responsible for creating the socket
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     * and establishing the connection
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     */
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    sock = socket(AF_INET, SOCK_STREAM, 0);
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    if(sock == LIBSSH2_INVALID_SOCKET) {
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        fprintf(stderr, "failed to create socket.\n");
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        goto shutdown;
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    }
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    sin.sin_family = AF_INET;
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    sin.sin_port = htons(22);
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    sin.sin_addr.s_addr = hostaddr;
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    if(connect(sock, (struct sockaddr*)(&sin), sizeof(struct sockaddr_in))) {
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        fprintf(stderr, "failed to connect.\n");
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        goto shutdown;
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    }
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    /* Create a session instance */
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    session = libssh2_session_init();
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    if(!session) {
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        fprintf(stderr, "Could not initialize SSH session.\n");
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        goto shutdown;
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    }
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    /* ... start it up. This will trade welcome banners, exchange keys,
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     * and setup crypto, compression, and MAC layers
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     */
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    rc = libssh2_session_handshake(session, sock);
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    if(rc) {
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        fprintf(stderr, "Failure establishing SSH session: %d\n", rc);
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        goto shutdown;
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    }
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    /* At this point we have not yet authenticated.  The first thing to do
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     * is check the hostkey's fingerprint against our known hosts Your app
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     * may have it hard coded, may go to a file, may present it to the
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     * user, that's your call
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     */
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    fingerprint = libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_SHA1);
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    fprintf(stderr, "Fingerprint: ");
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    for(i = 0; i < 20; i++) {
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        fprintf(stderr, "%02X ", (unsigned char)fingerprint[i]);
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    }
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    fprintf(stderr, "\n");
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    if(auth_pw) {
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        /* We could authenticate via password */
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        if(libssh2_userauth_password(session, username, password)) {
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            fprintf(stderr, "Authentication by password failed.\n");
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            goto shutdown;
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        }
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    }
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    else {
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        /* Or by public key */
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        if(libssh2_userauth_publickey_fromfile(session, username,
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                                               pubkey, privkey,
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                                               password)) {
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            fprintf(stderr, "Authentication by public key failed.\n");
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            goto shutdown;
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        }
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    }
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    sftp_session = libssh2_sftp_init(session);
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    if(!sftp_session) {
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        fprintf(stderr, "Unable to init SFTP session\n");
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        goto shutdown;
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    }
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    /* Since we have set non-blocking, tell libssh2 we are non-blocking */
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    libssh2_session_set_blocking(session, 0);
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    /* Make a directory via SFTP */
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    while(libssh2_sftp_mkdir(sftp_session, sftppath,
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                             LIBSSH2_SFTP_S_IRWXU |
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                             LIBSSH2_SFTP_S_IRGRP |
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                             LIBSSH2_SFTP_S_IXGRP |
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                             LIBSSH2_SFTP_S_IROTH |
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                             LIBSSH2_SFTP_S_IXOTH) ==
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          LIBSSH2_ERROR_EAGAIN);
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    libssh2_sftp_shutdown(sftp_session);
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shutdown:
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    if(session) {
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        libssh2_session_disconnect(session, "Normal Shutdown");
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        libssh2_session_free(session);
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    }
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    if(sock != LIBSSH2_INVALID_SOCKET) {
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        shutdown(sock, 2);
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        LIBSSH2_SOCKET_CLOSE(sock);
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    }
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    fprintf(stderr, "all done\n");
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    libssh2_exit();
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#ifdef _WIN32
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    WSACleanup();
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#endif
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    return 0;
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}
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