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/*
* Sample showing how to do SFTP 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 192.168.0.1 user password /tmp/secrets -p|-i|-k"
*/
#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_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>
const char *keyfile1 = "~/.ssh/id_rsa.pub";
const char *keyfile2 = "~/.ssh/id_rsa";
const char *username = "username";
const char *password = "password";
const char *sftppath = "/tmp/TEST";
static void kbd_callback(const char *name, int name_len,
const char *instruction, int instruction_len,
int num_prompts,
const LIBSSH2_USERAUTH_KBDINT_PROMPT *prompts,
LIBSSH2_USERAUTH_KBDINT_RESPONSE *responses,
void **abstract)
{
int i;
size_t n;
char buf[1024];
(void)abstract;
fprintf(stderr, "Performing keyboard-interactive authentication.\n");
fprintf(stderr, "Authentication name: '");
fwrite(name, 1, name_len, stderr);
fprintf(stderr, "'\n");
fprintf(stderr, "Authentication instruction: '");
fwrite(instruction, 1, instruction_len, stderr);
fprintf(stderr, "'\n");
fprintf(stderr, "Number of prompts: %d\n\n", num_prompts);
for(i = 0; i < num_prompts; i++) {
fprintf(stderr, "Prompt %d from server: '", i);
fwrite(prompts[i].text, 1, prompts[i].length, stderr);
fprintf(stderr, "'\n");
fprintf(stderr, "Please type response: ");
fgets(buf, sizeof(buf), stdin);
n = strlen(buf);
while(n > 0 && strchr("\r\n", buf[n - 1]))
n--;
buf[n] = 0;
responses[i].text = strdup(buf);
responses[i].length = n;
fprintf(stderr, "Response %d from user is '", i);
fwrite(responses[i].text, 1, responses[i].length, stderr);
fprintf(stderr, "'\n\n");
}
fprintf(stderr,
"Done. Sending keyboard-interactive responses to server now.\n");
}
int main(int argc, char *argv[])
{
unsigned long hostaddr;
int sock, i, auth_pw = 0;
struct sockaddr_in sin;
const char *fingerprint;
char *userauthlist;
LIBSSH2_SESSION *session;
int rc;
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 blocking */
libssh2_session_set_blocking(session, 1);
/* ... start it up. This will trade welcome banners, exchange keys,
* and setup crypto, compression, and MAC layers
*/
rc = libssh2_session_handshake(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_SHA1);
fprintf(stderr, "Fingerprint: ");
for(i = 0; i < 20; i++) {
fprintf(stderr, "%02X ", (unsigned char)fingerprint[i]);
}
fprintf(stderr, "\n");
/* check what authentication methods are available */
userauthlist = libssh2_userauth_list(session, username, strlen(username));
fprintf(stderr, "Authentication methods: %s\n", userauthlist);
if(strstr(userauthlist, "password") != NULL) {
auth_pw |= 1;
}
if(strstr(userauthlist, "keyboard-interactive") != NULL) {
auth_pw |= 2;
}
if(strstr(userauthlist, "publickey") != NULL) {
auth_pw |= 4;
}
/* if we got an 4. argument we set this option if supported */
if(argc > 5) {
if((auth_pw & 1) && !strcasecmp(argv[5], "-p")) {
auth_pw = 1;
}
if((auth_pw & 2) && !strcasecmp(argv[5], "-i")) {
auth_pw = 2;
}
if((auth_pw & 4) && !strcasecmp(argv[5], "-k")) {
auth_pw = 4;
}
}
if(auth_pw & 1) {
/* We could authenticate via password */
if(libssh2_userauth_password(session, username, password)) {
fprintf(stderr, "Authentication by password failed.\n");
goto shutdown;
}
}
else if(auth_pw & 2) {
/* Or via keyboard-interactive */
if(libssh2_userauth_keyboard_interactive(session, username,
&kbd_callback) ) {
fprintf(stderr,
"\tAuthentication by keyboard-interactive failed!\n");
goto shutdown;
}
else {
fprintf(stderr,
"\tAuthentication by keyboard-interactive succeeded.\n");
}
}
else if(auth_pw & 4) {
/* Or by public key */
if(libssh2_userauth_publickey_fromfile(session, username, keyfile1,
keyfile2, password)) {
fprintf(stderr, "\tAuthentication by public key failed!\n");
goto shutdown;
}
else {
fprintf(stderr, "\tAuthentication by public key succeeded.\n");
}
}
else {
fprintf(stderr, "No supported authentication methods found!\n");
goto shutdown;
}
fprintf(stderr, "libssh2_sftp_init()!\n");
sftp_session = libssh2_sftp_init(session);
if(!sftp_session) {
fprintf(stderr, "Unable to init SFTP session\n");
goto shutdown;
}
fprintf(stderr, "libssh2_sftp_open()!\n");
/* 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: %ld\n",
libssh2_sftp_last_error(sftp_session));
goto shutdown;
}
fprintf(stderr, "libssh2_sftp_open() is done, now receive data!\n");
do {
char mem[1024];
/* loop until we fail */
fprintf(stderr, "libssh2_sftp_read()!\n");
rc = libssh2_sftp_read(sftp_handle, mem, sizeof(mem));
if(rc > 0) {
write(1, mem, rc);
}
else {
break;
}
} while(1);
libssh2_sftp_close(sftp_handle);
libssh2_sftp_shutdown(sftp_session);
shutdown:
libssh2_session_disconnect(session, "Normal Shutdown");
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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