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libssh2/example/sftp_write_sliding.c
Viktor Szakats 854cfa8292
build: prepare builds for clang-cl, add cmake ossfuzz support 
- cmake: add support to build ossfuzz.
  Enable with `-DBUILD_OSSFUZZ=ON`.
  Also supports `-DLIB_FUZZING_ENGINE=` like autotools does.
- check for `__clang__` when suppressing warnings in source. Necessary
  for clang-cl, which set `__clang__`, but doesn't set `__GNU__`.
- cmake: optimize out 4 picky warning option detections with gcc.
- cmake: bring `-pedantic-error`, `-Wall` use closer to curl's.
- cmake: set `-Wno-language-extension-token` for clang-cl.
- cmake: escape only the necessary `-W` options for clang-cl.
- cmake: apply picky warnings to C++.
- cmake: replace `unset(VAR)` with `set(VAR "")` for init.
- cmake: prefer dash-style MSVC options.
- cmake: simplify `MATCHES` expression.
- cmake: formatting/whitespace.
- ci/GHA: bump `actions/upload-artifact` to v4

Closes #1524
2025-01-30 22:01:49 +01:00

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/* Copyright (C) The libssh2 project and its contributors.
*
* Sample showing how to do SFTP non-blocking write 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_write_sliding 192.168.0.1 user password thisfile /tmp/storehere
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "libssh2_setup.h"
#include <libssh2.h>
#include <libssh2_sftp.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <stdio.h>
#include <time.h> /* for time() */
#include <string.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 *loclfile = "sftp_write_nonblock.c";
static const char *sftppath = "/tmp/sftp_write_nonblock.c";
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__) || defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wsign-conversion"
#endif
FD_SET(socket_fd, &fd);
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic pop
#endif
/* 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;
int rc;
LIBSSH2_SESSION *session = NULL;
LIBSSH2_SFTP *sftp_session;
LIBSSH2_SFTP_HANDLE *sftp_handle;
FILE *local;
char mem[1024 * 1000];
size_t nread;
ssize_t nwritten;
size_t memuse;
time_t start;
libssh2_struct_stat_size total = 0;
int duration;
#ifdef _WIN32
WSADATA wsadata;
rc = WSAStartup(MAKEWORD(2, 0), &wsadata);
if(rc) {
fprintf(stderr, "WSAStartup failed with error: %d\n", rc);
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) {
loclfile = argv[4];
}
if(argc > 5) {
sftppath = argv[5];
}
rc = libssh2_init(0);
if(rc) {
fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);
return 1;
}
local = fopen(loclfile, "rb");
if(!local) {
fprintf(stderr, "Cannot open local file %s\n", loclfile);
return 1;
}
/*
* The application code is responsible for creating the socket
* and establishing the connection
*/
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 = hostaddr;
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;
}
/* Since we have set non-blocking, tell libssh2 we are non-blocking */
libssh2_session_set_blocking(session, 0);
/* ... 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);
goto shutdown;
}
/* 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,
pubkey, privkey,
password)) ==
LIBSSH2_ERROR_EAGAIN);
if(rc) {
fprintf(stderr, "Authentication by public key failed.\n");
goto shutdown;
}
}
fprintf(stderr, "libssh2_sftp_init().\n");
do {
sftp_session = libssh2_sftp_init(session);
if(!sftp_session &&
libssh2_session_last_errno(session) != LIBSSH2_ERROR_EAGAIN) {
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_WRITE |
LIBSSH2_FXF_CREAT |
LIBSSH2_FXF_TRUNC,
LIBSSH2_SFTP_S_IRUSR |
LIBSSH2_SFTP_S_IWUSR |
LIBSSH2_SFTP_S_IRGRP |
LIBSSH2_SFTP_S_IROTH);
if(!sftp_handle &&
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;
}
} while(!sftp_handle);
fprintf(stderr, "libssh2_sftp_open() is done, now send data.\n");
start = time(NULL);
memuse = 0; /* it starts blank */
do {
nread = fread(&mem[memuse], 1, sizeof(mem) - memuse, local);
if(nread <= 0) {
/* end of file */
if(memuse > 0)
/* the previous sending is not finished */
nread = 0;
else
break;
}
memuse += nread;
total += (libssh2_struct_stat_size)nread;
/* write data in a loop until we block */
while((nwritten = libssh2_sftp_write(sftp_handle, mem, memuse)) ==
LIBSSH2_ERROR_EAGAIN) {
waitsocket(sock, session);
}
if(nwritten < 0)
break;
if(memuse - (size_t)nwritten) {
/* make room for more data at the end of the buffer */
memmove(&mem[0], &mem[nwritten], memuse - (size_t)nwritten);
memuse -= (size_t)nwritten;
}
else
/* 'mem' was consumed fully */
memuse = 0;
} while(nwritten > 0);
duration = (int)(time(NULL) - start);
fprintf(stderr, "%ld bytes in %d seconds makes %.1f bytes/sec\n",
(long)total, duration, (double)total / duration);
fclose(local);
libssh2_sftp_close(sftp_handle);
libssh2_sftp_shutdown(sftp_session);
shutdown:
if(session) {
while(libssh2_session_disconnect(session, "Normal Shutdown") ==
LIBSSH2_ERROR_EAGAIN);
libssh2_session_free(session);
}
if(sock != LIBSSH2_INVALID_SOCKET) {
shutdown(sock, 2);
LIBSSH2_SOCKET_CLOSE(sock);
}
fprintf(stderr, "all done\n");
libssh2_exit();
#ifdef _WIN32
WSACleanup();
#endif
return 0;
}
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