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* $Id: sftp_nonblock.c,v 1.18 2009/04/28 10:35:30 bagder Exp $
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* Sample showing how to do SFTP non-blocking transfers.
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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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* "sftp_nonblock 192.168.0.1 user password /tmp/secrets"
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#include "libssh2_config.h"
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#include <libssh2_sftp.h>
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#ifdef HAVE_WINSOCK2_H
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# include <winsock2.h>
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#ifdef HAVE_SYS_SOCKET_H
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# include <sys/socket.h>
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#ifdef HAVE_SYS_SELECT_H
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# include <sys/select.h>
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#ifdef HAVE_ARPA_INET_H
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# include <arpa/inet.h>
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#include <sys/types.h>
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static long tvdiff(struct timeval newer, struct timeval older)
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return (newer.tv_sec-older.tv_sec)*1000+
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(newer.tv_usec-older.tv_usec)/1000;
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static int waitsocket(int socket_fd, LIBSSH2_SESSION *session)
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struct timeval timeout;
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fd_set *writefd = NULL;
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fd_set *readfd = NULL;
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FD_SET(socket_fd, &fd);
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/* now make sure we wait in the correct direction */
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dir = libssh2_session_block_directions(session);
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if(dir & LIBSSH2_SESSION_BLOCK_INBOUND)
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if(dir & LIBSSH2_SESSION_BLOCK_OUTBOUND)
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rc = select(socket_fd + 1, readfd, writefd, NULL, &timeout);
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int main(int argc, char *argv[])
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unsigned long hostaddr;
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int sock, i, auth_pw = 1;
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struct sockaddr_in sin;
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const char *fingerprint;
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LIBSSH2_SESSION *session;
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const char *username="username";
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const char *password="password";
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const char *sftppath="/tmp/TEST";
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#if defined(HAVE_IOCTLSOCKET)
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LIBSSH2_SFTP *sftp_session;
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LIBSSH2_SFTP_HANDLE *sftp_handle;
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WSAStartup(MAKEWORD(2,0), &wsadata);
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hostaddr = inet_addr(argv[1]);
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hostaddr = htonl(0x7F000001);
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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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sock = socket(AF_INET, SOCK_STREAM, 0);
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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),
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sizeof(struct sockaddr_in)) != 0) {
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fprintf(stderr, "failed to connect!\n");
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/* Create a session instance */
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session = libssh2_session_init();
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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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gettimeofday(&start, NULL);
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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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while ((rc = libssh2_session_startup(session, sock)) ==
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LIBSSH2_ERROR_EAGAIN);
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fprintf(stderr, "Failure establishing SSH session: %d\n", rc);
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/* At this point we havn't 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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fingerprint = libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_MD5);
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fprintf(stderr, "Fingerprint: ");
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for(i = 0; i < 16; i++) {
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fprintf(stderr, "%02X ", (unsigned char)fingerprint[i]);
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fprintf(stderr, "\n");
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/* We could authenticate via password */
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while ((rc = libssh2_userauth_password(session, username, password))
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== LIBSSH2_ERROR_EAGAIN);
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fprintf(stderr, "Authentication by password failed.\n");
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/* Or by public key */
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libssh2_userauth_publickey_fromfile(session, username,
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LIBSSH2_ERROR_EAGAIN);
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fprintf(stderr, "\tAuthentication by public key failed\n");
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libssh2_trace(session, LIBSSH2_TRACE_CONN);
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fprintf(stderr, "libssh2_sftp_init()!\n");
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sftp_session = libssh2_sftp_init(session);
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if(libssh2_session_last_errno(session) ==
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LIBSSH2_ERROR_EAGAIN) {
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fprintf(stderr, "non-blocking init\n");
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waitsocket(sock, session); /* now we wait */
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fprintf(stderr, "Unable to init SFTP session\n");
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} while (!sftp_session);
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fprintf(stderr, "libssh2_sftp_open()!\n");
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/* Request a file via SFTP */
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sftp_handle = libssh2_sftp_open(sftp_session, sftppath,
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LIBSSH2_FXF_READ, 0);
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if (libssh2_session_last_errno(session) != LIBSSH2_ERROR_EAGAIN) {
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fprintf(stderr, "Unable to open file with SFTP\n");
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fprintf(stderr, "non-blocking open\n");
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waitsocket(sock, session); /* now we wait */
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} while (!sftp_handle);
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fprintf(stderr, "libssh2_sftp_open() is done, now receive data!\n");
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/* loop until we fail */
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while ((rc = libssh2_sftp_read(sftp_handle, mem,
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sizeof(mem))) == LIBSSH2_ERROR_EAGAIN) {
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waitsocket(sock, session); /* now we wait */
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gettimeofday(&end, NULL);
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time_ms = tvdiff(end, start);
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printf("Got %d bytes in %ld ms = %.1f bytes/sec spin: %d\n", total,
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time_ms, total/(time_ms/1000.0), spin );
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libssh2_sftp_close(sftp_handle);
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libssh2_sftp_shutdown(sftp_session);
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printf("libssh2_session_disconnect\n");
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while ((rc = libssh2_session_disconnect(session,
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"Normal Shutdown, Thank you")) ==
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LIBSSH2_ERROR_EAGAIN);
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libssh2_session_free(session);
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fprintf(stderr, "all done\n");
added
removed
example/simple/sftp_nonblock.c
