*/
#include "includes.h"
-RCSID("$OpenBSD: clientloop.c,v 1.53 2001/03/06 01:08:27 millert Exp $");
+RCSID("$OpenBSD: clientloop.c,v 1.75 2001/06/04 23:07:20 markus Exp $");
#include "ssh.h"
#include "ssh1.h"
#include "buffer.h"
#include "bufaux.h"
#include "key.h"
+#include "kex.h"
#include "log.h"
#include "readconf.h"
#include "clientloop.h"
#include "authfd.h"
#include "atomicio.h"
+#include "sshtty.h"
+#include "misc.h"
/* import options */
extern Options options;
* because this is updated in a signal handler.
*/
static volatile int received_window_change_signal = 0;
-
-/* Terminal modes, as saved by enter_raw_mode. */
-static struct termios saved_tio;
-
-/*
- * Flag indicating whether we are in raw mode. This is used by
- * enter_raw_mode and leave_raw_mode.
- */
-static int in_raw_mode = 0;
+static volatile int received_signal = 0;
/* Flag indicating whether the user\'s terminal is in non-blocking mode. */
static int in_non_blocking_mode = 0;
static u_int buffer_high;/* Soft max buffer size. */
static int connection_in; /* Connection to server (input). */
static int connection_out; /* Connection to server (output). */
+static int need_rekeying; /* Set to non-zero if rekeying is requested. */
+static int session_closed = 0; /* In SSH2: login session closed. */
void client_init_dispatch(void);
int session_ident = -1;
-/* Returns the user\'s terminal to normal mode if it had been put in raw mode. */
-
-void
-leave_raw_mode(void)
-{
- if (!in_raw_mode)
- return;
- in_raw_mode = 0;
- if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0)
- perror("tcsetattr");
-
- fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL);
-}
-
-/* Puts the user\'s terminal in raw mode. */
-
-void
-enter_raw_mode(void)
-{
- struct termios tio;
-
- if (tcgetattr(fileno(stdin), &tio) < 0)
- perror("tcgetattr");
- saved_tio = tio;
- tio.c_iflag |= IGNPAR;
- tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
- tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
-#ifdef IEXTEN
- tio.c_lflag &= ~IEXTEN;
-#endif /* IEXTEN */
- tio.c_oflag &= ~OPOST;
- tio.c_cc[VMIN] = 1;
- tio.c_cc[VTIME] = 0;
- if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0)
- perror("tcsetattr");
- in_raw_mode = 1;
-
- fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL);
-}
+/*XXX*/
+extern Kex *xxx_kex;
/* Restores stdin to blocking mode. */
void
signal_handler(int sig)
{
- if (in_raw_mode)
- leave_raw_mode();
- if (in_non_blocking_mode)
- leave_non_blocking();
- channel_stop_listening();
- packet_close();
- fatal("Killed by signal %d.", sig);
+ received_signal = sig;
+ quit_pending = 1;
}
/*
void
client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
- int *maxfdp)
+ int *maxfdp, int rekeying)
{
/* Add any selections by the channel mechanism. */
- channel_prepare_select(readsetp, writesetp, maxfdp);
+ channel_prepare_select(readsetp, writesetp, maxfdp, rekeying);
if (!compat20) {
/* Read from the connection, unless our buffers are full. */
if (buffer_len(&stderr_buffer) > 0)
FD_SET(fileno(stderr), *writesetp);
} else {
- FD_SET(connection_in, *readsetp);
+ /* channel_prepare_select could have closed the last channel */
+ if (session_closed && !channel_still_open()) {
+ if (!packet_have_data_to_write())
+ return;
+ } else {
+ FD_SET(connection_in, *readsetp);
+ }
}
/* Select server connection if have data to write to the server. */
/* We have been continued. */
continue;
+ case 'R':
+ if (compat20) {
+ if (datafellows & SSH_BUG_NOREKEY)
+ log("Server does not support re-keying");
+ else
+ need_rekeying = 1;
+ }
+ continue;
+
case '&':
/* XXX does not work yet with proto 2 */
if (compat20)
"%c?\r\n\
Supported escape sequences:\r\n\
~. - terminate connection\r\n\
+~R - Request rekey (SSH protocol 2 only)\r\n\
~^Z - suspend ssh\r\n\
~# - list forwarded connections\r\n\
~& - background ssh (when waiting for connections to terminate)\r\n\
if (FD_ISSET(fileno(stdin), readset)) {
/* Read as much as possible. */
len = read(fileno(stdin), buf, sizeof(buf));
+ if (len < 0 && (errno == EAGAIN || errno == EINTR))
+ return; /* we'll try again later */
if (len <= 0) {
/*
* Received EOF or error. They are treated
packet_start(SSH_CMSG_EOF);
packet_send();
}
- } else if (escape_char == -1) {
+ } else if (escape_char == SSH_ESCAPECHAR_NONE) {
/*
* Normal successful read, and no escape character.
* Just append the data to buffer.
len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
buffer_len(&stdout_buffer));
if (len <= 0) {
- if (errno == EAGAIN)
+ if (errno == EINTR || errno == EAGAIN)
len = 0;
else {
/*
}
/* Consume printed data from the buffer. */
buffer_consume(&stdout_buffer, len);
- stdout_bytes += len;
+ stdout_bytes += len;
}
/* Write buffered output to stderr. */
if (FD_ISSET(fileno(stderr), writeset)) {
len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
buffer_len(&stderr_buffer));
if (len <= 0) {
- if (errno == EAGAIN)
+ if (errno == EINTR || errno == EAGAIN)
len = 0;
else {
/* EOF or error, but can't even print error message. */
}
/* Consume printed characters from the buffer. */
buffer_consume(&stderr_buffer, len);
- stderr_bytes += len;
+ stderr_bytes += len;
}
}
void
client_process_buffered_input_packets(void)
{
- dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL);
+ dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
}
/* scan buf[] for '~' before sending data to the peer */
return process_escapes(&c->input, &c->output, &c->extended, buf, len);
}
+void
+client_channel_closed(int id, void *arg)
+{
+ if (id != session_ident)
+ error("client_channel_closed: id %d != session_ident %d",
+ id, session_ident);
+ session_closed = 1;
+ if (in_raw_mode())
+ leave_raw_mode();
+}
+
/*
* Implements the interactive session with the server. This is called after
* the user has been authenticated, and a command has been started on the
- * remote host. If escape_char != -1, it is the character used as an escape
- * character for terminating or suspending the session.
+ * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
+ * used as an escape character for terminating or suspending the session.
*/
int
client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
{
fd_set *readset = NULL, *writeset = NULL;
- int max_fd = 0;
double start_time, total_time;
- int len;
+ int max_fd = 0, len, rekeying = 0;
char buf[100];
debug("Entering interactive session.");
max_fd = MAX(connection_in, connection_out);
if (!compat20) {
+ /* enable nonblocking unless tty */
+ if (!isatty(fileno(stdin)))
+ set_nonblock(fileno(stdin));
+ if (!isatty(fileno(stdout)))
+ set_nonblock(fileno(stdout));
+ if (!isatty(fileno(stderr)))
+ set_nonblock(fileno(stderr));
max_fd = MAX(max_fd, fileno(stdin));
max_fd = MAX(max_fd, fileno(stdout));
max_fd = MAX(max_fd, fileno(stderr));
if (compat20) {
session_ident = ssh2_chan_id;
- if (escape_char != -1)
+ if (escape_char != SSH_ESCAPECHAR_NONE)
channel_register_filter(session_ident,
simple_escape_filter);
+ if (session_ident != -1)
+ channel_register_cleanup(session_ident,
+ client_channel_closed);
} else {
/* Check if we should immediately send eof on stdin. */
client_check_initial_eof_on_stdin();
/* Process buffered packets sent by the server. */
client_process_buffered_input_packets();
- if (compat20 && !channel_still_open()) {
- debug2("!channel_still_open.");
+ if (compat20 && session_closed && !channel_still_open())
break;
- }
- /*
- * Make packets of buffered stdin data, and buffer them for
- * sending to the server.
- */
- if (!compat20)
- client_make_packets_from_stdin_data();
+ rekeying = (xxx_kex != NULL && !xxx_kex->done);
- /*
- * Make packets from buffered channel data, and enqueue them
- * for sending to the server.
- */
- if (packet_not_very_much_data_to_write())
- channel_output_poll();
+ if (rekeying) {
+ debug("rekeying in progress");
+ } else {
+ /*
+ * Make packets of buffered stdin data, and buffer
+ * them for sending to the server.
+ */
+ if (!compat20)
+ client_make_packets_from_stdin_data();
- /*
- * Check if the window size has changed, and buffer a message
- * about it to the server if so.
- */
- client_check_window_change();
+ /*
+ * Make packets from buffered channel data, and
+ * enqueue them for sending to the server.
+ */
+ if (packet_not_very_much_data_to_write())
+ channel_output_poll();
- if (quit_pending)
- break;
+ /*
+ * Check if the window size has changed, and buffer a
+ * message about it to the server if so.
+ */
+ client_check_window_change();
+ if (quit_pending)
+ break;
+ }
/*
* Wait until we have something to do (something becomes
* available on one of the descriptors).
*/
- client_wait_until_can_do_something(&readset, &writeset, &max_fd);
+ client_wait_until_can_do_something(&readset, &writeset,
+ &max_fd, rekeying);
if (quit_pending)
break;
- /* Do channel operations. */
- channel_after_select(readset, writeset);
+ /* Do channel operations unless rekeying in progress. */
+ if (!rekeying) {
+ channel_after_select(readset, writeset);
+
+ if (need_rekeying) {
+ debug("user requests rekeying");
+ xxx_kex->done = 0;
+ kex_send_kexinit(xxx_kex);
+ need_rekeying = 0;
+ }
+ }
/* Buffer input from the connection. */
client_process_net_input(readset);
/* Stop listening for connections. */
channel_stop_listening();
+ if (have_pty)
+ leave_raw_mode();
+
+ /* restore blocking io */
+ if (!isatty(fileno(stdin)))
+ unset_nonblock(fileno(stdin));
+ if (!isatty(fileno(stdout)))
+ unset_nonblock(fileno(stdout));
+ if (!isatty(fileno(stderr)))
+ unset_nonblock(fileno(stderr));
+
+ if (received_signal) {
+ if (in_non_blocking_mode) /* XXX */
+ leave_non_blocking();
+ fatal("Killed by signal %d.", received_signal);
+ }
+
/*
* In interactive mode (with pseudo tty) display a message indicating
* that the connection has been closed.
snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
buffer_append(&stderr_buffer, buf, strlen(buf));
}
+
/* Output any buffered data for stdout. */
while (buffer_len(&stdout_buffer) > 0) {
len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
break;
}
buffer_consume(&stdout_buffer, len);
- stdout_bytes += len;
+ stdout_bytes += len;
}
/* Output any buffered data for stderr. */
break;
}
buffer_consume(&stderr_buffer, len);
- stderr_bytes += len;
+ stderr_bytes += len;
}
- if (have_pty)
- leave_raw_mode();
-
/* Clear and free any buffers. */
memset(buf, 0, sizeof(buf));
buffer_free(&stdin_buffer);
Channel* c = NULL;
char *listen_address, *originator_address;
int listen_port, originator_port;
- int sock, newch;
+ int sock;
/* Get rest of the packet */
listen_address = packet_get_string(NULL);
listen_address, listen_port, originator_address, originator_port);
sock = channel_connect_by_listen_adress(listen_port);
- if (sock >= 0) {
- newch = channel_new("forwarded-tcpip",
- SSH_CHANNEL_CONNECTING, sock, sock, -1,
- CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
- xstrdup(originator_address), 1);
- c = channel_lookup(newch);
+ if (sock < 0) {
+ xfree(originator_address);
+ xfree(listen_address);
+ return NULL;
+ }
+ c = channel_new("forwarded-tcpip",
+ SSH_CHANNEL_CONNECTING, sock, sock, -1,
+ CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
+ xstrdup(originator_address), 1);
+ if (c == NULL) {
+ error("client_request_forwarded_tcpip: channel_new failed");
+ close(sock);
}
xfree(originator_address);
xfree(listen_address);
Channel *c = NULL;
char *originator;
int originator_port;
- int sock, newch;
+ int sock;
if (!options.forward_x11) {
error("Warning: ssh server tried X11 forwarding.");
/* XXX check permission */
debug("client_request_x11: request from %s %d", originator,
originator_port);
+ xfree(originator);
sock = x11_connect_display();
- if (sock >= 0) {
- newch = channel_new("x11",
- SSH_CHANNEL_X11_OPEN, sock, sock, -1,
- CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
- xstrdup("x11"), 1);
- c = channel_lookup(newch);
+ if (sock < 0)
+ return NULL;
+ c = channel_new("x11",
+ SSH_CHANNEL_X11_OPEN, sock, sock, -1,
+ CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
+ xstrdup("x11"), 1);
+ if (c == NULL) {
+ error("client_request_x11: channel_new failed");
+ close(sock);
}
- xfree(originator);
return c;
}
client_request_agent(const char *request_type, int rchan)
{
Channel *c = NULL;
- int sock, newch;
+ int sock;
if (!options.forward_agent) {
error("Warning: ssh server tried agent forwarding.");
return NULL;
}
sock = ssh_get_authentication_socket();
- if (sock >= 0) {
- newch = channel_new("authentication agent connection",
- SSH_CHANNEL_OPEN, sock, sock, -1,
- CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
- xstrdup("authentication agent connection"), 1);
- c = channel_lookup(newch);
+ if (sock < 0)
+ return NULL;
+ c = channel_new("authentication agent connection",
+ SSH_CHANNEL_OPEN, sock, sock, -1,
+ CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
+ xstrdup("authentication agent connection"), 1);
+ if (c == NULL) {
+ error("client_request_agent: channel_new failed");
+ close(sock);
}
return c;
}
c->remote_id = rchan;
c->remote_window = rwindow;
c->remote_maxpacket = rmaxpack;
-
- packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
- packet_put_int(c->remote_id);
- packet_put_int(c->self);
- packet_put_int(c->local_window);
- packet_put_int(c->local_maxpacket);
- packet_send();
+ if (c->type != SSH_CHANNEL_CONNECTING) {
+ packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
+ packet_put_int(c->remote_id);
+ packet_put_int(c->self);
+ packet_put_int(c->local_window);
+ packet_put_int(c->local_maxpacket);
+ packet_send();
+ }
} else {
debug("failure %s", ctype);
packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
packet_put_int(rchan);
packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
- packet_put_cstring("bla bla");
- packet_put_cstring("");
+ if (!(datafellows & SSH_BUG_OPENFAILURE)) {
+ packet_put_cstring("open failed");
+ packet_put_cstring("");
+ }
packet_send();
}
xfree(ctype);
dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
+
+ /* rekeying */
+ dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
}
void
client_init_dispatch_13(void)
andersk / openssh.git / blobdiff