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/* ssh_client.c */
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/*
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* Copyright 2003-2015 Aris Adamantiadis
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*
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* This file is part of the SSH Library
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*
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* You are free to copy this file, modify it in any way, consider it being public
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* domain. This does not apply to the rest of the library though, but it is
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* allowed to cut-and-paste working code from this file to any license of
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* program.
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* The goal is to show the API in action. It's not a reference on how terminal
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* clients must be made or how a client should react.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/select.h>
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#include <sys/time.h>
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#ifdef HAVE_TERMIOS_H
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#include <termios.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_PTY_H
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#include <pty.h>
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#endif
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#include <sys/ioctl.h>
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#include <signal.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <libssh/callbacks.h>
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#include <libssh/libssh.h>
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#include <libssh/sftp.h>
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#include "examples_common.h"
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#define MAXCMD 10
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static char *host;
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static char *user;
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static char *cmds[MAXCMD];
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static struct termios terminal;
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static char *pcap_file = NULL;
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static char *proxycommand;
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static int auth_callback(const char *prompt,
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char *buf,
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size_t len,
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int echo,
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int verify,
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void *userdata)
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{
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(void) verify;
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(void) userdata;
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return ssh_getpass(prompt, buf, len, echo, verify);
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}
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struct ssh_callbacks_struct cb = {
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.auth_function = auth_callback,
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.userdata = NULL,
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};
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static void add_cmd(char *cmd)
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{
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int n;
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for (n = 0; (n < MAXCMD) && cmds[n] != NULL; n++);
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if (n == MAXCMD) {
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return;
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}
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cmds[n] = strdup(cmd);
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}
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static void usage(void)
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{
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fprintf(stderr,
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"Usage : ssh [options] [login@]hostname\n"
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"sample client - libssh-%s\n"
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"Options :\n"
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" -l user : log in as user\n"
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" -p port : connect to port\n"
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" -d : use DSS to verify host public key\n"
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" -r : use RSA to verify host public key\n"
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#ifdef WITH_PCAP
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" -P file : create a pcap debugging file\n"
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#endif
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#ifndef _WIN32
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" -T proxycommand : command to execute as a socket proxy\n"
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#endif
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"\n",
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ssh_version(0));
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exit(0);
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}
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static int opts(int argc, char **argv)
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{
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int i;
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while((i = getopt(argc,argv,"T:P:")) != -1) {
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switch(i){
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case 'P':
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pcap_file = optarg;
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break;
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#ifndef _WIN32
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case 'T':
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proxycommand = optarg;
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break;
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#endif
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default:
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fprintf(stderr, "Unknown option %c\n", optopt);
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usage();
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}
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}
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if (optind < argc) {
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host = argv[optind++];
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}
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while(optind < argc) {
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add_cmd(argv[optind++]);
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}
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if (host == NULL) {
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usage();
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}
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return 0;
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}
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#ifndef HAVE_CFMAKERAW
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static void cfmakeraw(struct termios *termios_p)
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{
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termios_p->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
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termios_p->c_oflag &= ~OPOST;
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termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
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termios_p->c_cflag &= ~(CSIZE|PARENB);
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termios_p->c_cflag |= CS8;
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}
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#endif
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static void do_cleanup(int i)
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{
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/* unused variable */
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(void) i;
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31306d |
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tcsetattr(0, TCSANOW, &terminal);
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}
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static void do_exit(int i)
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{
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/* unused variable */
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(void) i;
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31306d |
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do_cleanup(0);
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exit(0);
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}
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static ssh_channel chan;
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static int signal_delayed = 0;
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static void sigwindowchanged(int i)
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{
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(void) i;
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31306d |
signal_delayed = 1;
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}
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static void setsignal(void)
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{
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31306d |
signal(SIGWINCH, sigwindowchanged);
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signal_delayed = 0;
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}
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static void sizechanged(void)
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{
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31306d |
struct winsize win = {
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31306d |
.ws_row = 0,
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31306d |
};
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31306d |
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ioctl(1, TIOCGWINSZ, &win);
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ssh_channel_change_pty_size(chan,win.ws_col, win.ws_row);
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31306d |
setsignal();
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31306d |
}
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31306d |
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31306d |
static void select_loop(ssh_session session,ssh_channel channel)
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31306d |
{
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31306d |
ssh_connector connector_in, connector_out, connector_err;
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31306d |
int rc;
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31306d |
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31306d |
ssh_event event = ssh_event_new();
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31306d |
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31306d |
/* stdin */
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connector_in = ssh_connector_new(session);
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ssh_connector_set_out_channel(connector_in, channel, SSH_CONNECTOR_STDINOUT);
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ssh_connector_set_in_fd(connector_in, 0);
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ssh_event_add_connector(event, connector_in);
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31306d |
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/* stdout */
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connector_out = ssh_connector_new(session);
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ssh_connector_set_out_fd(connector_out, 1);
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31306d |
ssh_connector_set_in_channel(connector_out, channel, SSH_CONNECTOR_STDINOUT);
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ssh_event_add_connector(event, connector_out);
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31306d |
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31306d |
/* stderr */
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31306d |
connector_err = ssh_connector_new(session);
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31306d |
ssh_connector_set_out_fd(connector_err, 2);
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31306d |
ssh_connector_set_in_channel(connector_err, channel, SSH_CONNECTOR_STDERR);
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31306d |
ssh_event_add_connector(event, connector_err);
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31306d |
|
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31306d |
while (ssh_channel_is_open(channel)) {
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Packit Service |
31306d |
if (signal_delayed) {
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Packit Service |
31306d |
sizechanged();
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Packit Service |
31306d |
}
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31306d |
rc = ssh_event_dopoll(event, 60000);
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31306d |
if (rc == SSH_ERROR) {
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Packit Service |
31306d |
fprintf(stderr, "Error in ssh_event_dopoll()\n");
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|
Packit Service |
31306d |
break;
|
|
Packit Service |
31306d |
}
|
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Packit Service |
31306d |
}
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|
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31306d |
ssh_event_remove_connector(event, connector_in);
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Packit Service |
31306d |
ssh_event_remove_connector(event, connector_out);
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31306d |
ssh_event_remove_connector(event, connector_err);
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31306d |
|
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Packit Service |
31306d |
ssh_connector_free(connector_in);
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31306d |
ssh_connector_free(connector_out);
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|
Packit Service |
31306d |
ssh_connector_free(connector_err);
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Packit Service |
31306d |
|
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Packit Service |
31306d |
ssh_event_free(event);
|
|
Packit Service |
31306d |
}
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31306d |
|
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31306d |
static void shell(ssh_session session)
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31306d |
{
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Packit Service |
31306d |
ssh_channel channel;
|
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Packit Service |
31306d |
struct termios terminal_local;
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|
Packit Service |
31306d |
int interactive=isatty(0);
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Packit Service |
31306d |
|
|
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31306d |
channel = ssh_channel_new(session);
|
|
Packit Service |
31306d |
if (channel == NULL) {
|
|
Packit Service |
31306d |
return;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
if (interactive) {
|
|
Packit Service |
31306d |
tcgetattr(0, &terminal_local);
|
|
Packit Service |
31306d |
memcpy(&terminal, &terminal_local, sizeof(struct termios));
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
if (ssh_channel_open_session(channel)) {
|
|
Packit Service |
31306d |
printf("Error opening channel : %s\n", ssh_get_error(session));
|
|
Packit Service |
31306d |
ssh_channel_free(channel);
|
|
Packit Service |
31306d |
return;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
chan = channel;
|
|
Packit Service |
31306d |
if (interactive) {
|
|
Packit Service |
31306d |
ssh_channel_request_pty(channel);
|
|
Packit Service |
31306d |
sizechanged();
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
if (ssh_channel_request_shell(channel)) {
|
|
Packit Service |
31306d |
printf("Requesting shell : %s\n", ssh_get_error(session));
|
|
Packit Service |
31306d |
ssh_channel_free(channel);
|
|
Packit Service |
31306d |
return;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
if (interactive) {
|
|
Packit Service |
31306d |
cfmakeraw(&terminal_local);
|
|
Packit Service |
31306d |
tcsetattr(0, TCSANOW, &terminal_local);
|
|
Packit Service |
31306d |
setsignal();
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
signal(SIGTERM, do_cleanup);
|
|
Packit Service |
31306d |
select_loop(session, channel);
|
|
Packit Service |
31306d |
if (interactive) {
|
|
Packit Service |
31306d |
do_cleanup(0);
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
ssh_channel_free(channel);
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
static void batch_shell(ssh_session session)
|
|
Packit Service |
31306d |
{
|
|
Packit Service |
31306d |
ssh_channel channel;
|
|
Packit Service |
31306d |
char buffer[1024];
|
|
Packit Service |
31306d |
size_t i;
|
|
Packit Service |
31306d |
int s = 0;
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
for (i = 0; i < MAXCMD && cmds[i]; ++i) {
|
|
Packit Service |
31306d |
s += snprintf(buffer + s, sizeof(buffer) - s, "%s ", cmds[i]);
|
|
Packit Service |
31306d |
free(cmds[i]);
|
|
Packit Service |
31306d |
cmds[i] = NULL;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
channel = ssh_channel_new(session);
|
|
Packit Service |
31306d |
if (channel == NULL) {
|
|
Packit Service |
31306d |
return;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
ssh_channel_open_session(channel);
|
|
Packit Service |
31306d |
if (ssh_channel_request_exec(channel, buffer)) {
|
|
Packit Service |
31306d |
printf("Error executing '%s' : %s\n", buffer, ssh_get_error(session));
|
|
Packit Service |
31306d |
ssh_channel_free(channel);
|
|
Packit Service |
31306d |
return;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
select_loop(session, channel);
|
|
Packit Service |
31306d |
ssh_channel_free(channel);
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
static int client(ssh_session session)
|
|
Packit Service |
31306d |
{
|
|
Packit Service |
31306d |
int auth = 0;
|
|
Packit Service |
31306d |
char *banner;
|
|
Packit Service |
31306d |
int state;
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
if (user) {
|
|
Packit Service |
31306d |
if (ssh_options_set(session, SSH_OPTIONS_USER, user) < 0) {
|
|
Packit Service |
31306d |
return -1;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
if (ssh_options_set(session, SSH_OPTIONS_HOST ,host) < 0) {
|
|
Packit Service |
31306d |
return -1;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
if (proxycommand != NULL) {
|
|
Packit Service |
31306d |
if (ssh_options_set(session, SSH_OPTIONS_PROXYCOMMAND, proxycommand)) {
|
|
Packit Service |
31306d |
return -1;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
ssh_options_parse_config(session, NULL);
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
if (ssh_connect(session)) {
|
|
Packit Service |
31306d |
fprintf(stderr, "Connection failed : %s\n", ssh_get_error(session));
|
|
Packit Service |
31306d |
return -1;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
state = verify_knownhost(session);
|
|
Packit Service |
31306d |
if (state != 0) {
|
|
Packit Service |
31306d |
return -1;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
ssh_userauth_none(session, NULL);
|
|
Packit Service |
31306d |
banner = ssh_get_issue_banner(session);
|
|
Packit Service |
31306d |
if (banner) {
|
|
Packit Service |
31306d |
printf("%s\n", banner);
|
|
Packit Service |
31306d |
free(banner);
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
auth = authenticate_console(session);
|
|
Packit Service |
31306d |
if (auth != SSH_AUTH_SUCCESS) {
|
|
Packit Service |
31306d |
return -1;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
if (cmds[0] == NULL) {
|
|
Packit Service |
31306d |
shell(session);
|
|
Packit Service |
31306d |
} else {
|
|
Packit Service |
31306d |
batch_shell(session);
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
return 0;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
static ssh_pcap_file pcap;
|
|
Packit Service |
31306d |
static void set_pcap(ssh_session session)
|
|
Packit Service |
31306d |
{
|
|
Packit Service |
31306d |
if (pcap_file == NULL) {
|
|
Packit Service |
31306d |
return;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
pcap = ssh_pcap_file_new();
|
|
Packit Service |
31306d |
if (pcap == NULL) {
|
|
Packit Service |
31306d |
return;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
if (ssh_pcap_file_open(pcap, pcap_file) == SSH_ERROR) {
|
|
Packit Service |
31306d |
printf("Error opening pcap file\n");
|
|
Packit Service |
31306d |
ssh_pcap_file_free(pcap);
|
|
Packit Service |
31306d |
pcap = NULL;
|
|
Packit Service |
31306d |
return;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
ssh_set_pcap_file(session, pcap);
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
static void cleanup_pcap(void)
|
|
Packit Service |
31306d |
{
|
|
Packit Service |
31306d |
if (pcap != NULL) {
|
|
Packit Service |
31306d |
ssh_pcap_file_free(pcap);
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
pcap = NULL;
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
int main(int argc, char **argv)
|
|
Packit Service |
31306d |
{
|
|
Packit Service |
31306d |
ssh_session session;
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
session = ssh_new();
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
ssh_callbacks_init(&cb;;
|
|
Packit Service |
31306d |
ssh_set_callbacks(session,&cb;;
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
if (ssh_options_getopt(session, &argc, argv)) {
|
|
Packit Service |
31306d |
fprintf(stderr,
|
|
Packit Service |
31306d |
"Error parsing command line: %s\n",
|
|
Packit Service |
31306d |
ssh_get_error(session));
|
|
Packit Service |
31306d |
usage();
|
|
Packit Service |
31306d |
}
|
|
Packit Service |
31306d |
opts(argc, argv);
|
|
Packit Service |
31306d |
signal(SIGTERM, do_exit);
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
set_pcap(session);
|
|
Packit Service |
31306d |
client(session);
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
ssh_disconnect(session);
|
|
Packit Service |
31306d |
ssh_free(session);
|
|
Packit Service |
31306d |
cleanup_pcap();
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
ssh_finalize();
|
|
Packit Service |
31306d |
|
|
Packit Service |
31306d |
return 0;
|
|
Packit Service |
31306d |
}
|