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Commit 034338e4 authored by Niels Möller's avatar Niels Möller
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* src/lsh.c (make_client_connect): Don't invoke open_session here; 

instead use progn to apply a list of "actions"-commands to the
connection.
(make_start_session): New command, do open a session and send some
requests to it.
(parse_forward_arg): New function, to parse arguments to -L and -R.
(main): Build a list of "actions" when parsing the options. Added
options -L, -N, -g.

Rev: src/lsh.c:1.56
parent 288d8469
Hide whitespace changes
Inline Side-by-side
src/lsh.c
View file @ 034338e4
......@@ -40,6 +40,7 @@
#include "randomness.h"
#include "service.h"
#include "ssh.h"
#include "tcpforward.h"
#include "tty.h"
#include "userauth.h"
#include "werror.h"
......@@ -77,12 +78,24 @@ void usage(void)
" -z, --compression=ALGORITHM\n"
" --mac=ALGORITHM\n"
#if WITH_PTY_SUPPORT
" -t Request a remote pty\n"
" -nt Don't request a remote tty\n"
" -t, Request a remote pty\n"
" -nt, Don't request a remote tty\n"
" -g, Allow remote access to forwarded ports\n"
" -ng, Disallow remote access to forwarded ports (default)\n"
#endif /* WITH_PTY_SUPPORT */
" -q, --quiet\n"
" -v, --verbose\n"
" --debug\n");
" --debug\n"
#if WITH_TCP_FORWARD
" -L listen-port:host:port Forward local port\n"
" --forward-local-port listen-port:host:port\n"
#if 0
" -R, listen-port_host:port Forward remote port\n"
" --forward-remote-port listen-port_host:port\n"
#endif
#endif /* WITH_TCP_FORWARD */
" -N, --nop Don't start a remote shell\n"
);
exit(1);
}
......@@ -126,12 +139,23 @@ static struct lookup_verifier *make_fake_host_db(struct signature_algorithm *a)
(userauth_service object command)
(login object command)
(init_connection object command)
(open_session object command)
(requests object object_list))
(expr (lambda (port)
((progn requests) (open_session (init_connection
((progn requests) (init_connection
(login (userauth_service
(handshake (die_on_null (connect port)))))))))))
(handshake (die_on_null (connect port))))))))))
*/
/* GABA:
(expr
(name make_start_session)
(globals
(progn "&progn_command.super.super"))
(params
(open_session object command)
(requests object object_list))
(expr (lambda (connection)
((progn requests) (open_session connection)))))
*/
/* Requests a shell, and connects the channel to our stdio. */
......@@ -147,16 +171,41 @@ static struct lookup_verifier *make_fake_host_db(struct signature_algorithm *a)
(client_io (request_shell session)))))
*/
/* ;; GABA
(expr
(name do_pty)
(super command)
(params
(pty object ...))
(expr
(lambda (session)
(raw_mode (request_pty session)))))
*/
static int parse_forward_arg(char *arg,
UINT32 *listen_port, struct address_info **target)
{
char *first;
char *second;
char *end;
long port;
first = strchr(arg, ':');
if (!first)
return 0;
second = strchr(first + 1, ':');
if (!second || (second == first + 1))
return 0;
if (strchr(second + 1, ':'))
return 0;
port = strtol(arg, &end, 0);
if ( (end == arg) || (end != first)
|| (port < 0) || (port > 0xffff) )
return 0;
*listen_port = port;
port = strtol(second + 1, &end, 0);
if ( (end == second + 1) || (*end != '\0')
|| (port < 0) || (port > 0xffff) )
return 0;
*target = make_address_info(ssh_format("%ls", second - first - 1, first + 1), port);
return 1;
}
/* Window size for the session channel */
#define WINDOW_SIZE (SSH_MAX_PACKET << 3)
......@@ -172,16 +221,21 @@ int main(int argc, char **argv)
/* int term_width, term_height, term_width_pix, term_height_pix; */
int not;
#if WITH_PTY_SUPPORT
int tty;
int reset_tty;
int tty = -1;
int reset_tty = 0;
struct termios tty_mode;
int use_pty = -1; /* Means default */
#endif /* WITH_PTY_SUPPORT */
struct object_queue actions;
int shell_flag = 1;
int forward_gateway = 0;
int option;
int lsh_exit_code;
int lsh_exit_code = 0;
struct address_info *remote;
......@@ -193,9 +247,8 @@ int main(int argc, char **argv)
struct lookup_verifier *lookup;
struct command *get_pty = NULL;
struct object_list *requests;
int in, out, err;
/* int in, out, err; */
NEW(io_backend, backend);
......@@ -218,10 +271,12 @@ int main(int argc, char **argv)
-1);
not = 0;
object_queue_init(&actions);
for (;;)
{
static struct option options[] =
struct option options[] =
{
{ "verbose", no_argument, NULL, 'v' },
{ "quiet", no_argument, NULL, 'q' },
......@@ -231,10 +286,17 @@ int main(int argc, char **argv)
{ "crypto", required_argument, NULL, 'c' },
{ "compression", optional_argument, NULL, 'z'},
{ "mac", required_argument, NULL, 'm' },
#if WITH_TCP_FORWARD
{ "forward-local-port", required_argument, NULL, 'L'},
#if 0
{ "forward-remote-port", required_argument, NULL, 'R'},
#endif
#endif /* WITH_TCP_FORWARD */
{ "nop", no_argument, &shell_flag, 0 },
{ NULL }
};
option = getopt_long(argc, argv, "+c:l:np:qtvz::", options, NULL);
option = getopt_long(argc, argv, "+c:l:np:qgtvz:L:", options, NULL);
switch(option)
{
case -1:
......@@ -256,6 +318,9 @@ int main(int argc, char **argv)
use_pty = !not;
#endif /* WITH_PTY_SUPPORT */
break;
case 'g':
forward_gateway = !not;
break;
case 'v':
verbose_flag = 1;
break;
......@@ -287,6 +352,24 @@ int main(int argc, char **argv)
return EXIT_FAILURE;
}
break;
case 'L':
{
UINT32 listen_port;
struct address_info *target;
if (!parse_forward_arg(optarg, &listen_port, &target))
usage();
object_queue_add_tail(&actions,
&forward_local_port
(make_address_info((forward_gateway
? NULL
: ssh_format("%lz", "127.0.0.1")),
listen_port),
target)->super);
}
break;
case '?':
usage();
}
......@@ -315,108 +398,127 @@ int main(int argc, char **argv)
return EXIT_FAILURE;
}
#if WITH_PTY_SUPPORT
if (use_pty < 0)
use_pty = 1;
if (use_pty)
init_backend(backend);
if (shell_flag)
{
tty = open("/dev/tty", O_RDWR);
int in;
int out;
int err;
struct object_list *session_requests;
if (tty < 0)
#if WITH_PTY_SUPPORT
if (use_pty < 0)
use_pty = 1;
if (use_pty)
{
werror("lsh: Failed to open tty (errno = %i): %z\n",
errno, STRERROR(errno));
use_pty = 0;
tty = open("/dev/tty", O_RDWR);
if (tty < 0)
{
werror("lsh: Failed to open tty (errno = %i): %z\n",
errno, STRERROR(errno));
use_pty = 0;
}
else
{
reset_tty = tty_getattr(tty, &tty_mode);
get_pty = make_pty_request(tty);
}
}
#endif /* WITH_PTY_SUPPORT */
/* FIXME: We need a non-varargs constructor for lists. */
#if WITH_PTY_SUPPORT
if (get_pty)
session_requests = make_object_list(2, get_pty, start_shell(), -1);
else
#endif
session_requests = make_object_list(1, start_shell(), -1);
in = STDIN_FILENO;
out = STDOUT_FILENO;
if ( (err = dup(STDERR_FILENO)) < 0)
{
reset_tty = tty_getattr(tty, &tty_mode);
get_pty = make_pty_request(tty);
werror("Can't dup stderr: %z\n", STRERROR(errno));
return EXIT_FAILURE;
}
}
#endif /* WITH_PTY_SUPPORT */
in = STDIN_FILENO;
out = STDOUT_FILENO;
set_error_stream(STDERR_FILENO, 1);
if ( (err = dup(STDERR_FILENO)) < 0)
{
werror("Can't dup stderr: %z\n", STRERROR(errno));
return EXIT_FAILURE;
/* Exit code if no session is established */
lsh_exit_code = 17;
object_queue_add_tail
(&actions,
make_start_session
(make_open_session_command(make_client_session
(io_read(make_io_fd(backend, in), NULL, NULL),
io_write(make_io_fd(backend, out),
BLOCK_SIZE, NULL),
io_write(make_io_fd(backend, err),
BLOCK_SIZE, NULL),
WINDOW_SIZE,
&lsh_exit_code)),
session_requests));
}
init_backend(backend);
set_error_stream(STDERR_FILENO, 1);
make_kexinit
= make_simple_kexinit(r,
make_int_list(1, ATOM_DIFFIE_HELLMAN_GROUP1_SHA1,
-1),
make_int_list(1, ATOM_SSH_DSS, -1),
(preferred_crypto
? make_int_list(1, preferred_crypto, -1)
: default_crypto_algorithms()),
(preferred_mac
? make_int_list(1, preferred_mac, -1)
: default_mac_algorithms()),
(preferred_compression
? make_int_list(1, preferred_compression, -1)
: default_compression_algorithms()),
make_int_list(0, -1));
/* Exit code if no session is established */
lsh_exit_code = 17;
/* FIXME: We need a non-varargs constructor for lists. */
#if WITH_PTY_SUPPORT
if (get_pty)
requests = make_object_list(2, get_pty, start_shell(), -1);
if (object_queue_is_empty(&actions))
werror("lsh: No actions given. Exiting.\n");
else
#endif
requests = make_object_list(1, start_shell(), -1);
{
struct lsh_object *o =
make_client_connect(make_simple_connect(backend, NULL),
make_handshake_command(CONNECTION_CLIENT,
"lsh - a free ssh",
SSH_MAX_PACKET,
r,
algorithms,
make_kexinit,
NULL),
make_request_service(ATOM_SSH_USERAUTH),
make_client_userauth(ssh_format("%lz", user),
ATOM_SSH_CONNECTION),
make_connection_service(make_alist(0, -1),
make_alist(0, -1)),
make_open_session_command
(make_client_session
(io_read(make_io_fd(backend, in), NULL, NULL),
io_write(make_io_fd(backend, out),
BLOCK_SIZE, NULL),
io_write(make_io_fd(backend, err),
BLOCK_SIZE, NULL),
WINDOW_SIZE,
&lsh_exit_code)),
requests);
CAST_SUBTYPE(command, client_connect, o);
int res = COMMAND_CALL(client_connect, remote, NULL);
if (res)
{
make_kexinit
= make_simple_kexinit(r,
make_int_list(1, ATOM_DIFFIE_HELLMAN_GROUP1_SHA1,
-1),
make_int_list(1, ATOM_SSH_DSS, -1),
(preferred_crypto
? make_int_list(1, preferred_crypto, -1)
: default_crypto_algorithms()),
(preferred_mac
? make_int_list(1, preferred_mac, -1)
: default_mac_algorithms()),
(preferred_compression
? make_int_list(1, preferred_compression, -1)
: default_compression_algorithms()),
make_int_list(0, -1));
{
werror("lsh.c: connection failed, res = %i\n", res);
return 17;
struct lsh_object *o =
make_client_connect(make_simple_connect(backend, NULL),
make_handshake_command(CONNECTION_CLIENT,
"lsh - a free ssh",
SSH_MAX_PACKET,
r,
algorithms,
make_kexinit,
NULL),
make_request_service(ATOM_SSH_USERAUTH),
make_client_userauth(ssh_format("%lz", user),
ATOM_SSH_CONNECTION),
make_connection_service(make_alist(0, -1),
make_alist(0, -1)),
queue_to_list(&actions));
CAST_SUBTYPE(command, client_connect, o);
int res = COMMAND_CALL(client_connect, remote, NULL);
/* We can free the queue nodes now */
KILL_OBJECT_QUEUE(&actions);
if (res)
{
werror("lsh.c: connection failed, res = %i\n", res);
return 17;
}
}
}
io_run(backend);
/* FIXME: Perhaps we have to reset the stdio file descriptors to
* blocking mode? */
io_run(backend);
/* FIXME: Perhaps we have to reset the stdio file descriptors to
* blocking mode? */
}
#if WITH_PTY_SUPPORT
if (reset_tty)
tty_setattr(tty, &tty_mode);
......
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