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Copy pathscp.c
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197 lines (168 loc) · 4.97 KB
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/* Copyright (C) The libssh2 project and its contributors.
*
* Sample showing how to do a simple SCP transfer.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "libssh2_setup.h"
#include <libssh2.h>
#ifdef _WIN32
#define write(f, b, c) write(f, b, (unsigned int)(c))
#endif
#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
#include <stdio.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 *scppath = "/tmp/TEST";
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_CHANNEL *channel;
libssh2_struct_stat fileinfo;
libssh2_struct_stat_size got = 0;
#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) {
scppath = argv[4];
}
rc = libssh2_init(0);
if(rc) {
fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);
return 1;
}
/* Ultra basic "connect to port 22 on localhost". Your code is
* responsible for creating the socket 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;
}
/* ... 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);
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 */
if(libssh2_userauth_password(session, username, password)) {
fprintf(stderr, "Authentication by password failed.\n");
goto shutdown;
}
}
else {
/* Or by public key */
if(libssh2_userauth_publickey_fromfile(session, username,
pubkey, privkey,
password)) {
fprintf(stderr, "Authentication by public key failed.\n");
goto shutdown;
}
}
/* Request a file via SCP */
channel = libssh2_scp_recv2(session, scppath, &fileinfo);
if(!channel) {
fprintf(stderr, "Unable to open a session: %d\n",
libssh2_session_last_errno(session));
goto shutdown;
}
while(got < fileinfo.st_size) {
char mem[1024];
int amount = sizeof(mem);
ssize_t nread;
if((fileinfo.st_size - got) < amount) {
amount = (int)(fileinfo.st_size - got);
}
nread = libssh2_channel_read(channel, mem, (size_t)amount);
if(nread > 0) {
write(1, mem, (size_t)nread);
}
else if(nread < 0) {
fprintf(stderr, "libssh2_channel_read() failed: %ld\n",
(long)nread);
break;
}
got += nread;
}
libssh2_channel_free(channel);
channel = NULL;
shutdown:
if(session) {
libssh2_session_disconnect(session, "Normal Shutdown");
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;
}