#include "libssh2_setup.h"

#include <libssh2.h>

#include <libssh2_sftp.h>

#ifdef _WIN32

#define write(f, b, c) write((f), (b), (unsigned int)(c))

#ifdef HAVE_SYS_SOCKET_H

#include <sys/socket.h>

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#ifdef HAVE_NETINET_IN_H

#include <netinet/in.h>

#ifdef HAVE_SYS_TIME_H

#include <sys/time.h>

#include <stdio.h>

static const char *pubkey = "/home/username/.ssh/id_rsa.pub";

static const char *privkey = "/home/username/.ssh/id_rsa";

static const char *username = "username";

static const char *password = "password";

static const char *sftppath = "/tmp/TEST"; /* source path */

static const char *dest = "/tmp/TEST2"; /* destination path */

static const char *storage = "/tmp/sftp-storage"; /* local file name to store

static int waitsocket(libssh2_socket_t socket_fd, LIBSSH2_SESSION *session)

{

struct timeval timeout;

int rc;

fd_set fd;

fd_set *writefd = NULL;

fd_set *readfd = NULL;

int dir;

timeout.tv_sec = 10;

timeout.tv_usec = 0;

FD_ZERO(&fd);

#if defined(__GNUC__)

#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Wsign-conversion"

FD_SET(socket_fd, &fd);

#if defined(__GNUC__)

#pragma GCC diagnostic pop

/* now make sure we wait in the correct direction */

dir = libssh2_session_block_directions(session);

if(dir & LIBSSH2_SESSION_BLOCK_INBOUND)

readfd = &fd;

if(dir & LIBSSH2_SESSION_BLOCK_OUTBOUND)

writefd = &fd;

rc = select((int)(socket_fd + 1), readfd, writefd, NULL, &timeout);

return rc;

}

int main(int argc, char *argv[])

{

libssh2_socket_t sock;

int i, auth_pw = 1;

struct sockaddr_in sin;

const char *fingerprint;

int rc;

LIBSSH2_SESSION *session = NULL;

LIBSSH2_SFTP *sftp_session;

LIBSSH2_SFTP_HANDLE *sftp_handle;

FILE *tempstorage = NULL;

char mem[1000];

struct timeval timeout;

fd_set fd;

fd_set fd2;

#ifdef _WIN32

WSADATA wsadata;

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

if(rc) {

fprintf(stderr, "WSAStartup failed with error: %d\n", rc);

return 1;

}

if(argc > 1) {

username = argv[1];

}

if(argc > 2) {

password = argv[2];

}

if(argc > 3) {

sftppath = argv[3];

}

if(argc > 4) {

dest = argv[4];

}

rc = libssh2_init(0);

if(rc) {

fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);

return 1;

}

/* Ultra basic "connect to port 22 on localhost". Your code is

sock = socket(AF_INET, SOCK_STREAM, 0);

if(sock == LIBSSH2_INVALID_SOCKET) {

fprintf(stderr, "failed to create socket.\n");

goto shutdown;

}

sin.sin_family = AF_INET;

sin.sin_port = htons(22);

sin.sin_addr.s_addr = htonl(0x7F000001);

if(connect(sock, (struct sockaddr*)(&sin), sizeof(struct sockaddr_in))) {

fprintf(stderr, "failed to connect.\n");

goto shutdown;

}

/* Create a session instance */

session = libssh2_session_init();

if(!session) {

fprintf(stderr, "Could not initialize SSH session.\n");

goto shutdown;

}

/* ... start it up. This will trade welcome banners, exchange keys,

rc = libssh2_session_handshake(session, sock);

if(rc) {

fprintf(stderr, "Failure establishing SSH session: %d\n", rc);

goto shutdown;

}

libssh2_session_set_blocking(session, 0);

/* At this point we have not yet authenticated. The first thing to do

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");

tempstorage = fopen(storage, "wb");

if(!tempstorage) {

fprintf(stderr, "Cannot open temp storage file %s\n", storage);

goto shutdown;

}

if(auth_pw) {

/* We could authenticate via password */

while((rc = libssh2_userauth_password(session, username, password)) ==

LIBSSH2_ERROR_EAGAIN);

if(rc) {

fprintf(stderr, "Authentication by password failed.\n");

goto shutdown;

}

}

else {

/* Or by public key */

while((rc =

libssh2_userauth_publickey_fromfile(session, username,

pubkey, privkey,

password)) ==

LIBSSH2_ERROR_EAGAIN);

if(rc) {

fprintf(stderr, "Authentication by public key failed.\n");

goto shutdown;

}

}

do {

sftp_session = libssh2_sftp_init(session);

if(!sftp_session) {

if(libssh2_session_last_errno(session) == LIBSSH2_ERROR_EAGAIN) {

fprintf(stderr, "non-blocking init\n");

waitsocket(sock, session); /* now we wait */

}

else {

fprintf(stderr, "Unable to init SFTP session\n");

goto shutdown;

}

}

} while(!sftp_session);

/* Request a file via SFTP */

do {

sftp_handle = libssh2_sftp_open(sftp_session, sftppath,

LIBSSH2_FXF_READ, 0);

if(!sftp_handle) {

if(libssh2_session_last_errno(session) != LIBSSH2_ERROR_EAGAIN) {

fprintf(stderr, "Unable to open file with SFTP: %ld\n",

libssh2_sftp_last_error(sftp_session));

goto shutdown;

}

else {

fprintf(stderr, "non-blocking open\n");

waitsocket(sock, session); /* now we wait */

}

}

} while(!sftp_handle);

fprintf(stderr, "libssh2_sftp_open() is done, now receive data.\n");

do {

ssize_t nread;

do {

/* read in a loop until we block */

nread = libssh2_sftp_read(sftp_handle, mem, sizeof(mem));

fprintf(stderr, "libssh2_sftp_read returned %ld\n",

(long)nread);

if(nread > 0) {

/* write to stderr */

write(2, mem, (size_t)nread);

/* write to temporary storage area */

fwrite(mem, (size_t)nread, 1, tempstorage);

}

} while(nread > 0);

if(nread != LIBSSH2_ERROR_EAGAIN) {

/* error or end of file */

break;

}

timeout.tv_sec = 10;

timeout.tv_usec = 0;

FD_ZERO(&fd);

FD_ZERO(&fd2);

#if defined(__GNUC__)

#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Wsign-conversion"

FD_SET(sock, &fd);

FD_SET(sock, &fd2);

#if defined(__GNUC__)

#pragma GCC diagnostic pop

/* wait for readable or writeable */

rc = select((int)(sock + 1), &fd, &fd2, NULL, &timeout);

if(rc <= 0) {

/* negative is error

fprintf(stderr, "SFTP download timed out: %d\n", rc);

break;

}

} while(1);

libssh2_sftp_close(sftp_handle);

fclose(tempstorage);

tempstorage = fopen(storage, "rb");

if(!tempstorage) {

/* weird, we cannot read the file we just wrote to... */

fprintf(stderr, "Cannot open %s for reading\n", storage);

goto shutdown;

}

/* we're done downloading, now reverse the process and upload the

sftp_handle = libssh2_sftp_open(sftp_session, dest,

LIBSSH2_FXF_WRITE |

LIBSSH2_FXF_CREAT,

LIBSSH2_SFTP_S_IRUSR |

LIBSSH2_SFTP_S_IWUSR |

LIBSSH2_SFTP_S_IRGRP |

LIBSSH2_SFTP_S_IROTH);

if(sftp_handle) {

size_t nread;

char *ptr;

do {

ssize_t nwritten;

nread = fread(mem, 1, sizeof(mem), tempstorage);

if(nread <= 0) {

/* end of file */

break;

}

ptr = mem;

do {

/* write data in a loop until we block */

nwritten = libssh2_sftp_write(sftp_handle, ptr,

nread);

if(nwritten < 0)

break;

ptr += nwritten;

nread -= (size_t)nwritten;

} while(nwritten >= 0);

if(nwritten != LIBSSH2_ERROR_EAGAIN) {

/* error or end of file */

break;

}

timeout.tv_sec = 10;

timeout.tv_usec = 0;

FD_ZERO(&fd);

FD_ZERO(&fd2);

#if defined(__GNUC__)

#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Wsign-conversion"

FD_SET(sock, &fd);

FD_SET(sock, &fd2);

#if defined(__GNUC__)

#pragma GCC diagnostic pop

/* wait for readable or writeable */

rc = select((int)(sock + 1), &fd, &fd2, NULL, &timeout);

if(rc <= 0) {

/* negative is error

fprintf(stderr, "SFTP upload timed out: %d\n", rc);

break;

}

} while(1);

fprintf(stderr, "SFTP upload done.\n");

}

else {

fprintf(stderr, "SFTP failed to open destination path: %s\n",

dest);

}

libssh2_sftp_shutdown(sftp_session);

shutdown:

if(session) {

libssh2_session_disconnect(session, "Normal Shutdown");

libssh2_session_free(session);

}

if(sock != LIBSSH2_INVALID_SOCKET) {

shutdown(sock, 2);

LIBSSH2_SOCKET_CLOSE(sock);

}

if(tempstorage)

fclose(tempstorage);

fprintf(stderr, "all done\n");

libssh2_exit();

#ifdef _WIN32

WSACleanup();

return 0;

}