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bcb5eda096802fd45c435d2354eb83b313fd2fbb
libssh2/example/sftp_nonblock.c
Viktor Szakats 1d9af00609 tidy-up: fix typos (#886) 
detected by codespell 2.2.4.
2023-03-27 19:26:58 +02:00

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/*
* Sample showing how to do SFTP non-blocking transfers.
*
* The sample code has default values for host name, user name, password
* and path to copy, but you can specify them on the command line like:
*
* "sftp_nonblock 192.168.0.1 user password /tmp/secrets"
*/
#ifdef WIN32
#ifndef _WINSOCK_DEPRECATED_NO_WARNINGS
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#endif
#endif
#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_SYS_SELECT_H
# include <sys/select.h>
#endif
# ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <ctype.h>
#if defined(_MSC_VER) && _MSC_VER < 1900
#pragma warning(disable:4127)
#endif
#ifdef WIN32
#define write(f, b, c) write((f), (b), (unsigned int)(c))
#endif
#ifdef HAVE_GETTIMEOFDAY
/* diff in ms */
static long tvdiff(struct timeval newer, struct timeval older)
{
return (newer.tv_sec-older.tv_sec)*1000+
(newer.tv_usec-older.tv_usec)/1000;
}
#endif
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);
FD_SET(socket_fd, &fd);
/* 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[])
{
uint32_t hostaddr;
libssh2_socket_t sock;
int 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/TEST";
#ifdef HAVE_GETTIMEOFDAY
struct timeval start;
struct timeval end;
long time_ms;
#endif
int rc;
libssh2_struct_stat_size total = 0;
int spin = 0;
LIBSSH2_SFTP *sftp_session;
LIBSSH2_SFTP_HANDLE *sftp_handle;
#ifdef WIN32
WSADATA wsadata;
int err;
err = WSAStartup(MAKEWORD(2, 0), &wsadata);
if(err != 0) {
fprintf(stderr, "WSAStartup failed with error: %d\n", err);
return 1;
}
#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;
/* Since we have set non-blocking, tell libssh2 we are non-blocking */
libssh2_session_set_blocking(session, 0);
#ifdef HAVE_GETTIMEOFDAY
gettimeofday(&start, NULL);
#endif
/* ... start it up. This will trade welcome banners, exchange keys,
* and setup crypto, compression, and MAC layers
*/
while((rc = libssh2_session_handshake(session, sock)) ==
LIBSSH2_ERROR_EAGAIN);
if(rc) {
fprintf(stderr, "Failure establishing SSH session: %d\n", rc);
return -1;
}
/* At this point we have not 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 */
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,
"/home/username/"
".ssh/id_rsa.pub",
"/home/username/"
".ssh/id_rsa",
password)) ==
LIBSSH2_ERROR_EAGAIN);
if(rc) {
fprintf(stderr, "\tAuthentication by public key failed\n");
goto shutdown;
}
}
#if 0
libssh2_trace(session, LIBSSH2_TRACE_CONN);
#endif
fprintf(stderr, "libssh2_sftp_init()!\n");
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);
fprintf(stderr, "libssh2_sftp_open()!\n");
/* 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\n");
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 {
char mem[1024*24];
ssize_t nread;
/* loop until we fail */
while((nread = libssh2_sftp_read(sftp_handle, mem,
sizeof(mem))) == LIBSSH2_ERROR_EAGAIN) {
spin++;
waitsocket(sock, session); /* now we wait */
}
if(nread > 0) {
total += nread;
write(1, mem, nread);
}
else {
break;
}
} while(1);
#ifdef HAVE_GETTIMEOFDAY
gettimeofday(&end, NULL);
time_ms = tvdiff(end, start);
fprintf(stderr, "Got %ld bytes in %ld ms = %.1f bytes/sec spin: %d\n",
(long)total, time_ms, (double)total/(time_ms/1000.0), spin);
#else
fprintf(stderr, "Got %ld bytes spin: %d\n", (long)total, spin);
#endif
libssh2_sftp_close(sftp_handle);
libssh2_sftp_shutdown(sftp_session);
shutdown:
fprintf(stderr, "libssh2_session_disconnect\n");
while(libssh2_session_disconnect(session,
"Normal Shutdown, Thank you") ==
LIBSSH2_ERROR_EAGAIN);
libssh2_session_free(session);
#ifdef WIN32
closesocket(sock);
#else
close(sock);
#endif
fprintf(stderr, "all done\n");
libssh2_exit();
return 0;
}
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