/*
- *
- * clientloop.c
- *
* Author: Tatu Ylonen <ylo@cs.hut.fi>
- *
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
+ * The main loop for the interactive session (client side).
*
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
*
- * Created: Sat Sep 23 12:23:57 1995 ylo
*
- * The main loop for the interactive session (client side).
+ * Copyright (c) 1999 Theo de Raadt. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
*
* SSH2 support added by Markus Friedl.
+ * Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "includes.h"
-RCSID("$OpenBSD: clientloop.c,v 1.28 2000/07/13 23:14:08 provos Exp $");
+RCSID("$OpenBSD: clientloop.c,v 1.39 2000/10/27 07:48:22 markus Exp $");
#include "xmalloc.h"
#include "ssh.h"
#include "packet.h"
#include "buffer.h"
-#include "authfd.h"
#include "readconf.h"
#include "ssh2.h"
#include "channels.h"
#include "dispatch.h"
+#include "buffer.h"
+#include "bufaux.h"
+
+
+/* import options */
+extern Options options;
/* Flag indicating that stdin should be redirected from /dev/null. */
extern int stdin_null_flag;
static int in_non_blocking_mode = 0;
/* Common data for the client loop code. */
+static int quit_pending; /* Set to non-zero to quit the client loop. */
+static int escape_char; /* Escape character. */
static int escape_pending; /* Last character was the escape character */
static int last_was_cr; /* Last character was a newline. */
static int exit_status; /* Used to store the exit status of the command. */
static Buffer stdin_buffer; /* Buffer for stdin data. */
static Buffer stdout_buffer; /* Buffer for stdout data. */
static Buffer stderr_buffer; /* Buffer for stderr data. */
+static unsigned long stdin_bytes, stdout_bytes, stderr_bytes;
static unsigned int buffer_high;/* Soft max buffer size. */
static int max_fd; /* Maximum file descriptor number in select(). */
static int connection_in; /* Connection to server (input). */
static int connection_out; /* Connection to server (output). */
-static unsigned long stdin_bytes, stdout_bytes, stderr_bytes;
-static int quit_pending; /* Set to non-zero to quit the client loop. */
-static int escape_char; /* Escape character. */
void client_init_dispatch(void);
if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
return;
- debug("client_check_window_change: changed");
+ debug2("client_check_window_change: changed");
if (compat20) {
channel_request_start(session_ident, "window-change", 0);
void
client_wait_until_can_do_something(fd_set * readset, fd_set * writeset)
{
- /*debug("client_wait_until_can_do_something"); */
-
/* Initialize select masks. */
FD_ZERO(readset);
FD_ZERO(writeset);
}
void
-client_suspend_self()
+client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
{
struct winsize oldws, newws;
/* Flush stdout and stderr buffers. */
- if (buffer_len(&stdout_buffer) > 0)
- atomicio(write, fileno(stdout), buffer_ptr(&stdout_buffer),
- buffer_len(&stdout_buffer));
- if (buffer_len(&stderr_buffer) > 0)
- atomicio(write, fileno(stderr), buffer_ptr(&stderr_buffer),
- buffer_len(&stderr_buffer));
+ if (buffer_len(bout) > 0)
+ atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
+ if (buffer_len(berr) > 0)
+ atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
leave_raw_mode();
* Free (and clear) the buffer to reduce the amount of data that gets
* written to swap.
*/
- buffer_free(&stdin_buffer);
- buffer_free(&stdout_buffer);
- buffer_free(&stderr_buffer);
+ buffer_free(bin);
+ buffer_free(bout);
+ buffer_free(berr);
/* Save old window size. */
ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
received_window_change_signal = 1;
/* OK, we have been continued by the user. Reinitialize buffers. */
- buffer_init(&stdin_buffer);
- buffer_init(&stdout_buffer);
- buffer_init(&stderr_buffer);
+ buffer_init(bin);
+ buffer_init(bout);
+ buffer_init(berr);
enter_raw_mode();
}
if (FD_ISSET(connection_in, readset)) {
/* Read as much as possible. */
len = read(connection_in, buf, sizeof(buf));
-/*debug("read connection_in len %d", len); XXX */
if (len == 0) {
/* Received EOF. The remote host has closed the connection. */
snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
}
}
+/* process the characters one by one */
+int
+process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
+{
+ char string[1024];
+ pid_t pid;
+ int bytes = 0;
+ unsigned int i;
+ unsigned char ch;
+ char *s;
+
+ for (i = 0; i < len; i++) {
+ /* Get one character at a time. */
+ ch = buf[i];
+
+ if (escape_pending) {
+ /* We have previously seen an escape character. */
+ /* Clear the flag now. */
+ escape_pending = 0;
+
+ /* Process the escaped character. */
+ switch (ch) {
+ case '.':
+ /* Terminate the connection. */
+ snprintf(string, sizeof string, "%c.\r\n", escape_char);
+ buffer_append(berr, string, strlen(string));
+ /*stderr_bytes += strlen(string); XXX*/
+
+ quit_pending = 1;
+ return -1;
+
+ case 'Z' - 64:
+ /* Suspend the program. */
+ /* Print a message to that effect to the user. */
+ snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
+ buffer_append(berr, string, strlen(string));
+ /*stderr_bytes += strlen(string); XXX*/
+
+ /* Restore terminal modes and suspend. */
+ client_suspend_self(bin, bout, berr);
+
+ /* We have been continued. */
+ continue;
+
+ case '&':
+ /* XXX does not work yet with proto 2 */
+ if (compat20)
+ continue;
+ /*
+ * Detach the program (continue to serve connections,
+ * but put in background and no more new connections).
+ */
+ if (!stdin_eof) {
+ /*
+ * Sending SSH_CMSG_EOF alone does not always appear
+ * to be enough. So we try to send an EOF character
+ * first.
+ */
+ packet_start(SSH_CMSG_STDIN_DATA);
+ packet_put_string("\004", 1);
+ packet_send();
+ /* Close stdin. */
+ stdin_eof = 1;
+ if (buffer_len(bin) == 0) {
+ packet_start(SSH_CMSG_EOF);
+ packet_send();
+ }
+ }
+ /* Restore tty modes. */
+ leave_raw_mode();
+
+ /* Stop listening for new connections. */
+ channel_stop_listening();
+
+ printf("%c& [backgrounded]\n", escape_char);
+
+ /* Fork into background. */
+ pid = fork();
+ if (pid < 0) {
+ error("fork: %.100s", strerror(errno));
+ continue;
+ }
+ if (pid != 0) { /* This is the parent. */
+ /* The parent just exits. */
+ exit(0);
+ }
+ /* The child continues serving connections. */
+ continue; /*XXX ? */
+
+ case '?':
+ snprintf(string, sizeof string,
+"%c?\r\n\
+Supported escape sequences:\r\n\
+~. - terminate connection\r\n\
+~^Z - suspend ssh\r\n\
+~# - list forwarded connections\r\n\
+~& - background ssh (when waiting for connections to terminate)\r\n\
+~? - this message\r\n\
+~~ - send the escape character by typing it twice\r\n\
+(Note that escapes are only recognized immediately after newline.)\r\n",
+ escape_char);
+ buffer_append(berr, string, strlen(string));
+ continue;
+
+ case '#':
+ snprintf(string, sizeof string, "%c#\r\n", escape_char);
+ buffer_append(berr, string, strlen(string));
+ s = channel_open_message();
+ buffer_append(berr, s, strlen(s));
+ xfree(s);
+ continue;
+
+ default:
+ if (ch != escape_char) {
+ buffer_put_char(bin, escape_char);
+ bytes++;
+ }
+ /* Escaped characters fall through here */
+ break;
+ }
+ } else {
+ /*
+ * The previous character was not an escape char. Check if this
+ * is an escape.
+ */
+ if (last_was_cr && ch == escape_char) {
+ /* It is. Set the flag and continue to next character. */
+ escape_pending = 1;
+ continue;
+ }
+ }
+
+ /*
+ * Normal character. Record whether it was a newline,
+ * and append it to the buffer.
+ */
+ last_was_cr = (ch == '\r' || ch == '\n');
+ buffer_put_char(bin, ch);
+ bytes++;
+ }
+ return bytes;
+}
+
void
client_process_input(fd_set * readset)
{
+ int ret;
int len;
- pid_t pid;
- char buf[8192], *s;
+ char buf[8192];
/* Read input from stdin. */
if (FD_ISSET(fileno(stdin), readset)) {
* Normal, successful read. But we have an escape character
* and have to process the characters one by one.
*/
- unsigned int i;
- for (i = 0; i < len; i++) {
- unsigned char ch;
- /* Get one character at a time. */
- ch = buf[i];
-
- if (escape_pending) {
- /* We have previously seen an escape character. */
- /* Clear the flag now. */
- escape_pending = 0;
- /* Process the escaped character. */
- switch (ch) {
- case '.':
- /* Terminate the connection. */
- snprintf(buf, sizeof buf, "%c.\r\n", escape_char);
- buffer_append(&stderr_buffer, buf, strlen(buf));
- stderr_bytes += strlen(buf);
- quit_pending = 1;
- return;
-
- case 'Z' - 64:
- /* Suspend the program. */
- /* Print a message to that effect to the user. */
- snprintf(buf, sizeof buf, "%c^Z\r\n", escape_char);
- buffer_append(&stderr_buffer, buf, strlen(buf));
- stderr_bytes += strlen(buf);
-
- /* Restore terminal modes and suspend. */
- client_suspend_self();
-
- /* We have been continued. */
- continue;
-
- case '&':
- /*
- * Detach the program (continue to serve connections,
- * but put in background and no more new connections).
- */
- if (!stdin_eof) {
- /*
- * Sending SSH_CMSG_EOF alone does not always appear
- * to be enough. So we try to send an EOF character
- * first.
- */
- packet_start(SSH_CMSG_STDIN_DATA);
- packet_put_string("\004", 1);
- packet_send();
- /* Close stdin. */
- stdin_eof = 1;
- if (buffer_len(&stdin_buffer) == 0) {
- packet_start(SSH_CMSG_EOF);
- packet_send();
- }
- }
- /* Restore tty modes. */
- leave_raw_mode();
-
- /* Stop listening for new connections. */
- channel_stop_listening();
-
- printf("%c& [backgrounded]\n", escape_char);
-
- /* Fork into background. */
- pid = fork();
- if (pid < 0) {
- error("fork: %.100s", strerror(errno));
- continue;
- }
- if (pid != 0) { /* This is the parent. */
- /* The parent just exits. */
- exit(0);
- }
- /* The child continues serving connections. */
- continue;
-
- case '?':
- snprintf(buf, sizeof buf,
-"%c?\r\n\
-Supported escape sequences:\r\n\
-~. - terminate connection\r\n\
-~^Z - suspend ssh\r\n\
-~# - list forwarded connections\r\n\
-~& - background ssh (when waiting for connections to terminate)\r\n\
-~? - this message\r\n\
-~~ - send the escape character by typing it twice\r\n\
-(Note that escapes are only recognized immediately after newline.)\r\n",
- escape_char);
- buffer_append(&stderr_buffer, buf, strlen(buf));
- continue;
-
- case '#':
- snprintf(buf, sizeof buf, "%c#\r\n", escape_char);
- buffer_append(&stderr_buffer, buf, strlen(buf));
- s = channel_open_message();
- buffer_append(&stderr_buffer, s, strlen(s));
- xfree(s);
- continue;
-
- default:
- if (ch != escape_char) {
- /*
- * Escape character followed by non-special character.
- * Append both to the input buffer.
- */
- buf[0] = escape_char;
- buf[1] = ch;
- buffer_append(&stdin_buffer, buf, 2);
- stdin_bytes += 2;
- continue;
- }
- /*
- * Note that escape character typed twice
- * falls through here; the latter gets processed
- * as a normal character below.
- */
- break;
- }
- } else {
- /*
- * The previous character was not an escape char. Check if this
- * is an escape.
- */
- if (last_was_cr && ch == escape_char) {
- /* It is. Set the flag and continue to next character. */
- escape_pending = 1;
- continue;
- }
- }
-
- /*
- * Normal character. Record whether it was a newline,
- * and append it to the buffer.
- */
- last_was_cr = (ch == '\r' || ch == '\n');
- buf[0] = ch;
- buffer_append(&stdin_buffer, buf, 1);
- stdin_bytes += 1;
- continue;
- }
+ ret = process_escapes(&stdin_buffer, &stdout_buffer, &stderr_buffer, buf, len);
+ if (ret == -1)
+ return;
+ stdout_bytes += ret;
}
}
}
void
client_process_buffered_input_packets()
{
- dispatch_run(DISPATCH_NONBLOCK, &quit_pending);
+ dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL);
+}
+
+/* scan buf[] for '~' before sending data to the peer */
+
+int
+simple_escape_filter(Channel *c, char *buf, int len)
+{
+ /* XXX we assume c->extended is writeable */
+ return process_escapes(&c->input, &c->output, &c->extended, buf, len);
}
/*
*/
int
-client_loop(int have_pty, int escape_char_arg)
+client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
{
- extern Options options;
double start_time, total_time;
int len;
char buf[100];
if (!compat20)
client_check_initial_eof_on_stdin();
+ if (compat20 && escape_char != -1)
+ channel_register_filter(ssh2_chan_id, simple_escape_filter);
+
/* Main loop of the client for the interactive session mode. */
while (!quit_pending) {
fd_set readset, writeset;
client_process_buffered_input_packets();
if (compat20 && !channel_still_open()) {
- debug("!channel_still_open.");
+ debug2("!channel_still_open.");
break;
}
/*********/
void
-client_input_stdout_data(int type, int plen)
+client_input_stdout_data(int type, int plen, void *ctxt)
{
unsigned int data_len;
char *data = packet_get_string(&data_len);
xfree(data);
}
void
-client_input_stderr_data(int type, int plen)
+client_input_stderr_data(int type, int plen, void *ctxt)
{
unsigned int data_len;
char *data = packet_get_string(&data_len);
xfree(data);
}
void
-client_input_exit_status(int type, int plen)
+client_input_exit_status(int type, int plen, void *ctxt)
{
packet_integrity_check(plen, 4, type);
exit_status = packet_get_int();
/* XXXX move to generic input handler */
void
-client_input_channel_open(int type, int plen)
+client_input_channel_open(int type, int plen, void *ctxt)
{
Channel *c = NULL;
char *ctype;
debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
ctype, rchan, rwindow, rmaxpack);
- if (strcmp(ctype, "x11") == 0) {
+ if (strcmp(ctype, "x11") == 0 && options.forward_x11) {
int sock;
char *originator;
int originator_port;
originator = packet_get_string(NULL);
if (datafellows & SSH_BUG_X11FWD) {
- debug("buggy server: x11 request w/o originator_port");
+ debug2("buggy server: x11 request w/o originator_port");
originator_port = 0;
} else {
originator_port = packet_get_int();
sock = x11_connect_display();
if (sock >= 0) {
id = channel_new("x11", SSH_CHANNEL_X11_OPEN,
- sock, sock, -1, 4*1024, 32*1024, 0,
- xstrdup("x11"));
+ sock, sock, -1, CHAN_X11_WINDOW_DEFAULT,
+ CHAN_X11_PACKET_DEFAULT, 0, xstrdup("x11"), 1);
c = channel_lookup(id);
}
}
dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
- dispatch_set(SSH_SMSG_AGENT_OPEN, &auth_input_open_request);
dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
- dispatch_set(SSH_SMSG_X11_OPEN, &x11_input_open);
+
+ dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
+ &auth_input_open_request : &deny_input_open);
+ dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
+ &x11_input_open : &deny_input_open);
}
void
client_init_dispatch_15()
c = channel_lookup(id);
if (c == NULL)
- fatal("session_input_channel_req: channel %d: bad channel", id);
+ fatal("client_input_channel_req: channel %d: bad channel", id);
if (session_ident == -1) {
error("client_input_channel_req: no channel %d", id);
void
client_set_session_ident(int id)
{
- debug("client_set_session_ident: id %d", id);
+ debug2("client_set_session_ident: id %d", id);
session_ident = id;
channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST,
client_input_channel_req, (void *)0);
andersk / openssh.git / blobdiff