385 lines
11 KiB
C
385 lines
11 KiB
C
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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 transfers in a non-blocking manner.
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*
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* It will first download a given source file, store it locally and then
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* upload the file again to a given destination file.
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*
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* Using the SFTP server running on 127.0.0.1
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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 _WIN32
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#define write(f, b, c) write((f), (b), (unsigned int)(c))
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#endif
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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_SYS_TIME_H
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#include <sys/time.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/TEST"; /* source path */
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static const char *dest = "/tmp/TEST2"; /* destination path */
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static const char *storage = "/tmp/sftp-storage"; /* local file name to store
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the downloaded file in */
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static int waitsocket(libssh2_socket_t socket_fd, LIBSSH2_SESSION *session)
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{
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struct timeval timeout;
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int rc;
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fd_set fd;
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fd_set *writefd = NULL;
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fd_set *readfd = NULL;
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int dir;
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timeout.tv_sec = 10;
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timeout.tv_usec = 0;
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FD_ZERO(&fd);
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#if defined(__GNUC__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wsign-conversion"
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#endif
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FD_SET(socket_fd, &fd);
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#if defined(__GNUC__)
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#pragma GCC diagnostic pop
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#endif
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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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readfd = &fd;
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if(dir & LIBSSH2_SESSION_BLOCK_OUTBOUND)
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writefd = &fd;
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rc = select((int)(socket_fd + 1), readfd, writefd, NULL, &timeout);
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return rc;
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}
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int main(int argc, char *argv[])
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{
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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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LIBSSH2_SFTP_HANDLE *sftp_handle;
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FILE *tempstorage = NULL;
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char mem[1000];
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struct timeval timeout;
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fd_set fd;
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fd_set fd2;
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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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username = argv[1];
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}
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if(argc > 2) {
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password = argv[2];
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}
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if(argc > 3) {
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sftppath = argv[3];
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}
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if(argc > 4) {
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dest = 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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/* Ultra basic "connect to port 22 on localhost". Your code is
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* responsible for creating the socket 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 = htonl(0x7F000001);
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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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libssh2_session_set_blocking(session, 0);
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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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tempstorage = fopen(storage, "wb");
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if(!tempstorage) {
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fprintf(stderr, "Cannot open temp storage file %s\n", storage);
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goto shutdown;
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}
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if(auth_pw) {
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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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if(rc) {
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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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while((rc =
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libssh2_userauth_publickey_fromfile(session, username,
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pubkey, privkey,
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password)) ==
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LIBSSH2_ERROR_EAGAIN);
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if(rc) {
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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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do {
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sftp_session = libssh2_sftp_init(session);
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if(!sftp_session) {
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if(libssh2_session_last_errno(session) == 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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}
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else {
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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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}
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} while(!sftp_session);
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/* Request a file via SFTP */
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do {
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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(!sftp_handle) {
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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: %ld\n",
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libssh2_sftp_last_error(sftp_session));
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goto shutdown;
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}
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else {
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fprintf(stderr, "non-blocking open\n");
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waitsocket(sock, session); /* now we wait */
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}
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}
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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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do {
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ssize_t nread;
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do {
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/* read in a loop until we block */
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nread = libssh2_sftp_read(sftp_handle, mem, sizeof(mem));
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fprintf(stderr, "libssh2_sftp_read returned %ld\n",
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(long)nread);
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if(nread > 0) {
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/* write to stderr */
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write(2, mem, (size_t)nread);
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/* write to temporary storage area */
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fwrite(mem, (size_t)nread, 1, tempstorage);
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}
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} while(nread > 0);
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if(nread != LIBSSH2_ERROR_EAGAIN) {
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/* error or end of file */
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break;
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}
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timeout.tv_sec = 10;
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timeout.tv_usec = 0;
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FD_ZERO(&fd);
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FD_ZERO(&fd2);
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#if defined(__GNUC__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wsign-conversion"
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#endif
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FD_SET(sock, &fd);
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FD_SET(sock, &fd2);
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#if defined(__GNUC__)
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#pragma GCC diagnostic pop
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#endif
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/* wait for readable or writeable */
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rc = select((int)(sock + 1), &fd, &fd2, NULL, &timeout);
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if(rc <= 0) {
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/* negative is error
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0 is timeout */
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fprintf(stderr, "SFTP download timed out: %d\n", rc);
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break;
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}
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} while(1);
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libssh2_sftp_close(sftp_handle);
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fclose(tempstorage);
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tempstorage = fopen(storage, "rb");
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if(!tempstorage) {
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/* weird, we cannot read the file we just wrote to... */
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fprintf(stderr, "Cannot open %s for reading\n", storage);
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goto shutdown;
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}
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/* we're done downloading, now reverse the process and upload the
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temporarily stored data to the destination path */
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sftp_handle = libssh2_sftp_open(sftp_session, dest,
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LIBSSH2_FXF_WRITE |
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LIBSSH2_FXF_CREAT,
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LIBSSH2_SFTP_S_IRUSR |
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LIBSSH2_SFTP_S_IWUSR |
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LIBSSH2_SFTP_S_IRGRP |
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LIBSSH2_SFTP_S_IROTH);
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if(sftp_handle) {
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size_t nread;
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char *ptr;
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do {
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ssize_t nwritten;
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nread = fread(mem, 1, sizeof(mem), tempstorage);
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if(nread <= 0) {
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/* end of file */
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break;
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}
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ptr = mem;
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do {
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/* write data in a loop until we block */
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nwritten = libssh2_sftp_write(sftp_handle, ptr,
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nread);
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if(nwritten < 0)
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break;
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ptr += nwritten;
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nread -= (size_t)nwritten;
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} while(nwritten >= 0);
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if(nwritten != LIBSSH2_ERROR_EAGAIN) {
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/* error or end of file */
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break;
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}
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timeout.tv_sec = 10;
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timeout.tv_usec = 0;
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FD_ZERO(&fd);
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FD_ZERO(&fd2);
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#if defined(__GNUC__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wsign-conversion"
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#endif
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FD_SET(sock, &fd);
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FD_SET(sock, &fd2);
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#if defined(__GNUC__)
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#pragma GCC diagnostic pop
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#endif
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/* wait for readable or writeable */
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rc = select((int)(sock + 1), &fd, &fd2, NULL, &timeout);
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if(rc <= 0) {
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/* negative is error
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0 is timeout */
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fprintf(stderr, "SFTP upload timed out: %d\n", rc);
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break;
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}
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} while(1);
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fprintf(stderr, "SFTP upload done.\n");
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}
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else {
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fprintf(stderr, "SFTP failed to open destination path: %s\n",
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dest);
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}
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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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if(tempstorage)
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fclose(tempstorage);
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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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