122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
#include "libssh2.h"
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <ctype.h>
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int main(int argc, char *argv[]) {
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int sock, i, auth_pw = 1;
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struct sockaddr_in sin;
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char *fingerprint;
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LIBSSH2_SESSION *session;
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LIBSSH2_CHANNEL *channel;
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/* Ultra basic "connect to port 22 on localhost"
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* Your code is 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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fcntl(sock, F_SETFL, 0);
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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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connect(sock, (struct sockaddr*)(&sin), sizeof(struct sockaddr_in));
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/* Create a session instance and start it up
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* This will trade welcome banners, exchange keys, and setup crypto, compression, and MAC layers
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*/
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session = libssh2_session_init();
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if (libssh2_session_startup(session, sock)) {
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fprintf(stderr, "Failure establishing SSH session\n");
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return -1;
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}
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/* At this point we havn't authenticated,
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* The first thing to do is check the hostkey's fingerprint against our known hosts
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* Your app may have it hard coded, may go to a file, may present it to the user, that's your call
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*/
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fingerprint = libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_MD5);
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printf("Fingerprint: ");
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for(i = 0; i < 16; i++) {
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printf("%02X ", (unsigned char)fingerprint[i]);
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}
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printf("\n");
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if (auth_pw) {
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/* We could authenticate via password */
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if (libssh2_userauth_password(session, "username", "password")) {
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printf("Authentication by password failed.\n");
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goto shutdown;
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}
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} else {
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/* Or by public key */
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if (libssh2_userauth_publickey_fromfile(session, "username", "/home/username/.ssh/id_rsa.pub", "/home/username/.ssh/id_rsa", "pasphrase")) {
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printf("\tAuthentication by public key failed\n");
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goto shutdown;
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}
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}
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/* Request a shell */
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if (!(channel = libssh2_channel_open_session(session))) {
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fprintf(stderr, "Unable to open a session\n");
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goto shutdown;
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}
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/* Some environment variables may be set,
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* It's up to the server which ones it'll allow though
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*/
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libssh2_channel_setenv(channel, "FOO", "bar");
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/* Request a terminal with 'vanilla' terminal emulation
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* See /etc/termcap for more options
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*/
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if (libssh2_channel_request_pty(channel, "vanilla")) {
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fprintf(stderr, "Failed requesting pty\n");
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goto skip_shell;
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}
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/* Open a SHELL on that pty */
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if (libssh2_channel_shell(channel)) {
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fprintf(stderr, "Unable to request shell on allocated pty\n");
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goto shutdown;
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}
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/* At this point the shell can be interacted with using
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* libssh2_channel_read()
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* libssh2_channel_read_stderr()
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* libssh2_channel_write()
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* libssh2_channel_write_stderr()
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*
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* Blocking mode may be (en|dis)abled with: libssh2_channel_set_blocking()
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* If the server send EOF, libssh2_channel_eof() will return non-0
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* To send EOF to the server use: libssh2_channel_send_eof()
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* A channel can be closed with: libssh2_channel_close()
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* A channel can be freed with: libssh2_channel_free()
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*/
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skip_shell:
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if (channel) {
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libssh2_channel_free(channel);
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channel = NULL;
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}
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/* Other channel types are supported via:
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* libssh2_scp_send()
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* libssh2_scp_recv()
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* libssh2_channel_direct_tcpip()
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*/
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shutdown:
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libssh2_session_disconnect(session, "Normal Shutdown, Thank you for playing");
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libssh2_session_free(session);
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sleep(1);
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close(sock);
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return 0;
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}
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