/*
 * Sample doing an SFTP directory listing.
 *
 * The sample code has default values for host name, user name, password and
 * path, but you can specify them on the command line like:
 *
 * "sftpdir 192.168.0.1 user password /tmp/secretdir"
 */ 
 
#include "libssh2_config.h"
#include <libssh2.h>
#include <libssh2_sftp.h>
 
#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
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
 
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <ctype.h>
 
/* last resort for systems not defining PRIu64 in inttypes.h */ 
#ifndef __PRI64_PREFIX
#ifdef WIN32
#define __PRI64_PREFIX "I64"
#else
#if __WORDSIZE == 64
#define __PRI64_PREFIX "l"
#else
#define __PRI64_PREFIX "ll"
#endif  
#endif  
#endif  
#ifndef PRIu64
#define PRIu64 __PRI64_PREFIX "u"
#endif   
 
int main(int argc, char *argv[])
{
    unsigned long hostaddr;
    int sock, i, auth_pw = 1;
    struct sockaddr_in sin;
    const char *fingerprint;
    LIBSSH2_SESSION *session;
    const char *username="username";
    const char *password="password";
    const char *sftppath="/tmp/secretdir";
    int rc;
    LIBSSH2_SFTP *sftp_session;
    LIBSSH2_SFTP_HANDLE *sftp_handle;
 
#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];
    }
    if(argc > 4) {
        sftppath = argv[4];
    }
 
    rc = libssh2_init (0);

    if (rc != 0) {
        fprintf (stderr, "libssh2 initialization failed (%d)\n", rc);
        return 1;
    }
 
    /*
     * The application code is responsible for creating the socket
     * and 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
     */ 
    session = libssh2_session_init();

    if(!session)
        return -1;
 
    /* ... start it up. This will trade welcome banners, exchange keys,
     * and setup crypto, compression, and MAC layers
     */ 
    rc = libssh2_session_handshake(session, sock);

    if(rc) {
        fprintf(stderr, "Failure establishing SSH session: %d\n", rc);
        return -1;
    }
 
    /* At this point we havn't yet 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);

    fprintf(stderr, "Fingerprint: ");
    for(i = 0; i < 20; i++) {
        fprintf(stderr, "%02X ", (unsigned char)fingerprint[i]);
    }
    fprintf(stderr, "\n");
 
    if (auth_pw) {
        /* We could authenticate via password */ 
        if (libssh2_userauth_password(session, username, password)) {

            fprintf(stderr, "Authentication by password failed.\n");
            goto shutdown;
        }
    } else {
        /* Or by public key */ 
        if (libssh2_userauth_publickey_fromfile(session, username,

                            "/home/username/.ssh/id_rsa.pub",
                            "/home/username/.ssh/id_rsa",
                            password)) {
            fprintf(stderr, "\tAuthentication by public key failed\n");
            goto shutdown;
        }
    }
 
    fprintf(stderr, "libssh2_sftp_init()!\n");

    sftp_session = libssh2_sftp_init(session);

 
    if (!sftp_session) {
        fprintf(stderr, "Unable to init SFTP session\n");
        goto shutdown;
    }
 
    /* Since we have not set non-blocking, tell libssh2 we are blocking */ 
    libssh2_session_set_blocking(session, 1);

 
    fprintf(stderr, "libssh2_sftp_opendir()!\n");

    /* Request a dir listing via SFTP */ 
    sftp_handle = libssh2_sftp_opendir(sftp_session, sftppath);

 
    if (!sftp_handle) {
        fprintf(stderr, "Unable to open dir with SFTP\n");
        goto shutdown;
    }
    fprintf(stderr, "libssh2_sftp_opendir() is done, now receive listing!\n");

    do {
        char mem[512];
        char longentry[512];
        LIBSSH2_SFTP_ATTRIBUTES attrs;
 
        /* loop until we fail */ 
        rc = libssh2_sftp_readdir_ex(sftp_handle, mem, sizeof(mem),

                                     longentry, sizeof(longentry), &attrs);
        if(rc > 0) {
            /* rc is the length of the file name in the mem
               buffer */ 
 
            if (longentry[0] != '\0') {
                printf("%s\n", longentry);
            } else {
                if(attrs.flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) {
                    /* this should check what permissions it
                       is and print the output accordingly */ 
                    printf("--fix----- ");
                }
                else {
                    printf("---------- ");
                }
 
                if(attrs.flags & LIBSSH2_SFTP_ATTR_UIDGID) {
                    printf("%4ld %4ld ", attrs.uid, attrs.gid);
                }
                else {
                    printf("   -    - ");
                }
 
                if(attrs.flags & LIBSSH2_SFTP_ATTR_SIZE) {
                    printf("%8" PRIu64 " ", attrs.filesize);
                }
 
                printf("%s\n", mem);
            }
        }
        else
            break;
 
    } while (1);
 
    libssh2_sftp_closedir(sftp_handle);

    libssh2_sftp_shutdown(sftp_session);

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

    libssh2_session_free(session);

 
#ifdef WIN32
    closesocket(sock);
#else
    close(sock);
#endif
    fprintf(stderr, "all done\n");
 
    libssh2_exit();

 
    return 0;
}