mirror of
https://github.com/libssh2/libssh2.git
synced 2025-11-03 22:13:11 +03:00
9d55db6501
blocking way. The channel code is now responsible for enabling/disabling
blocking status and to work with it.
I've also modified indenting and fixed compiler warnings at places, and
added a bunch of new examples in example/simple that I've used to verify that
the code still runs like before.
libssh2_channel_{read|write}nb_ex() and libssh2_sftp_{read|write}nb() are the
four new functions that supposedly work non-blocking.
282 lines
9.0 KiB
C
282 lines
9.0 KiB
C
/*
|
|
* $Id: sftp_nonblock.c,v 1.1 2007/02/02 16:21:20 bagder Exp $
|
|
*
|
|
* Sample showing how to do SFTP transfers in a non-blocking manner.
|
|
*
|
|
* It will first download a given source file, store it locally and then
|
|
* upload the file again to a given destination file.
|
|
*
|
|
* Using the SFTP server running on 127.0.0.1
|
|
*/
|
|
|
|
#include <libssh2.h>
|
|
#include <libssh2_sftp.h>
|
|
|
|
#ifndef WIN32
|
|
# include <netinet/in.h>
|
|
# include <sys/socket.h>
|
|
# include <unistd.h>
|
|
#else
|
|
# include <winsock2.h>
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
|
|
#define STORAGE "/tmp/sftp-storage" /* this is the local file name this
|
|
example uses to store the downloaded
|
|
file in */
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int sock, i, auth_pw = 1;
|
|
struct sockaddr_in sin;
|
|
const char *fingerprint;
|
|
LIBSSH2_SESSION *session;
|
|
char *username=(char *)"username";
|
|
char *password=(char *)"password";
|
|
char *sftppath=(char *)"/tmp/TEST"; /* source path */
|
|
char *dest=(char *)"/tmp/TEST2"; /* destination path */
|
|
int rc;
|
|
LIBSSH2_SFTP *sftp_session;
|
|
LIBSSH2_SFTP_HANDLE *sftp_handle;
|
|
FILE *tempstorage;
|
|
char mem[1000];
|
|
struct timeval timeout;
|
|
fd_set fd;
|
|
|
|
#ifdef WIN32
|
|
WSADATA wsadata;
|
|
|
|
WSAStartup(WINSOCK_VERSION, &wsadata);
|
|
#endif
|
|
|
|
/* Ultra basic "connect to port 22 on localhost"
|
|
* The application is responsible for creating the socket 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 = htonl(0x7F000001);
|
|
if (connect(sock, (struct sockaddr*)(&sin),
|
|
sizeof(struct sockaddr_in)) != 0) {
|
|
fprintf(stderr, "failed to connect!\n");
|
|
return -1;
|
|
}
|
|
|
|
/* We set the socket non-blocking. We do it after the connect just to
|
|
simplify the example code. */
|
|
#ifdef F_SETFL
|
|
/* FIXME: this can/should be done in a more portable manner */
|
|
rc = fcntl(sock, F_GETFL, 0);
|
|
fcntl(sock, F_SETFL, rc | O_NONBLOCK);
|
|
#else
|
|
#error "add support for setting the socket non-blocking here"
|
|
#endif
|
|
|
|
/* Create a session instance
|
|
*/
|
|
session = libssh2_session_init();
|
|
if(!session)
|
|
return -1;
|
|
|
|
/* ... start it up. This will trade welcome banners, exchange keys,
|
|
* and setup crypto, compression, and MAC layers
|
|
*/
|
|
rc = libssh2_session_startup(session, sock);
|
|
if(rc) {
|
|
fprintf(stderr, "Failure establishing SSH session: %d\n", rc);
|
|
return -1;
|
|
}
|
|
|
|
/* At this point we havn't 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_MD5);
|
|
printf("Fingerprint: ");
|
|
for(i = 0; i < 16; i++) {
|
|
printf("%02X ", (unsigned char)fingerprint[i]);
|
|
}
|
|
printf("\n");
|
|
|
|
if(argc > 1) {
|
|
username = argv[1];
|
|
}
|
|
if(argc > 2) {
|
|
password = argv[2];
|
|
}
|
|
if(argc > 3) {
|
|
sftppath = argv[3];
|
|
}
|
|
if(argc > 4) {
|
|
dest = argv[4];
|
|
}
|
|
|
|
tempstorage = fopen(STORAGE, "wb");
|
|
if(!tempstorage) {
|
|
printf("Can't open temp storage file %s\n", STORAGE);
|
|
goto shutdown;
|
|
}
|
|
|
|
if (auth_pw) {
|
|
/* We could authenticate via password */
|
|
if (libssh2_userauth_password(session, username, password)) {
|
|
printf("Authentication by password failed.\n");
|
|
goto shutdown;
|
|
}
|
|
} else {
|
|
/* Or by public key */
|
|
if (libssh2_userauth_publickey_fromfile(session, username,
|
|
"/home/username/.ssh/id_rsa.pub",
|
|
"/home/username/.ssh/id_rsa",
|
|
password)) {
|
|
printf("\tAuthentication by public key failed\n");
|
|
goto shutdown;
|
|
}
|
|
}
|
|
|
|
sftp_session = libssh2_sftp_init(session);
|
|
|
|
if (!sftp_session) {
|
|
fprintf(stderr, "Unable to init SFTP session\n");
|
|
goto shutdown;
|
|
}
|
|
|
|
/* Request a file via SFTP */
|
|
sftp_handle =
|
|
libssh2_sftp_open(sftp_session, sftppath, LIBSSH2_FXF_READ, 0);
|
|
|
|
if (!sftp_handle) {
|
|
fprintf(stderr, "Unable to open file with SFTP\n");
|
|
goto shutdown;
|
|
}
|
|
fprintf(stderr, "libssh2_sftp_open() is done, now receive data!\n");
|
|
do {
|
|
do {
|
|
/* read in a loop until we block */
|
|
rc = libssh2_sftp_readnb(sftp_handle, mem,
|
|
sizeof(mem));
|
|
fprintf(stderr, "libssh2_sftp_read returned %d\n",
|
|
rc);
|
|
|
|
if(rc > 0) {
|
|
/* write to stderr */
|
|
write(2, mem, rc);
|
|
/* write to temporary storage area */
|
|
fwrite(mem, rc, 1, tempstorage);
|
|
}
|
|
} while (rc > 0);
|
|
|
|
if(rc != LIBSSH2SFTP_EAGAIN) {
|
|
/* error or end of file */
|
|
break;
|
|
}
|
|
|
|
timeout.tv_sec = 10;
|
|
timeout.tv_usec = 0;
|
|
|
|
FD_ZERO(&fd);
|
|
|
|
FD_SET(sock, &fd);
|
|
|
|
/* wait for readable or writeable */
|
|
rc = select(sock+1, &fd, &fd, NULL, &timeout);
|
|
if(rc <= 0) {
|
|
/* negative is error
|
|
0 is timeout */
|
|
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 can't read the file we just wrote to... */
|
|
fprintf(stderr, "can't open %s for reading\n", STORAGE);
|
|
goto shutdown;
|
|
}
|
|
|
|
/* we're done downloading, now reverse the process and upload the
|
|
temporarily stored data to the destination path */
|
|
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 {
|
|
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 */
|
|
rc = libssh2_sftp_writenb(sftp_handle, ptr,
|
|
nread);
|
|
ptr += rc;
|
|
nread -= nread;
|
|
} while (rc > 0);
|
|
|
|
if(rc != LIBSSH2SFTP_EAGAIN) {
|
|
/* error or end of file */
|
|
break;
|
|
}
|
|
|
|
timeout.tv_sec = 10;
|
|
timeout.tv_usec = 0;
|
|
|
|
FD_ZERO(&fd);
|
|
|
|
FD_SET(sock, &fd);
|
|
|
|
/* wait for readable or writeable */
|
|
rc = select(sock+1, &fd, &fd, NULL, &timeout);
|
|
if(rc <= 0) {
|
|
/* negative is error
|
|
0 is timeout */
|
|
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:
|
|
|
|
libssh2_session_disconnect(session, "Normal Shutdown, Thank you for playing");
|
|
libssh2_session_free(session);
|
|
|
|
#ifdef WIN32
|
|
Sleep(1000);
|
|
closesocket(sock);
|
|
#else
|
|
sleep(1);
|
|
close(sock);
|
|
#endif
|
|
printf("all done\n");
|
|
return 0;
|
|
}
|