1*e146993eSDag-Erling Smørgrav /* $OpenBSD: clientloop.c,v 1.236 2011/06/22 22:08:42 djm Exp $ */ 289986192SBrooks Davis /* $FreeBSD$ */ 3511b41d2SMark Murray /* 4511b41d2SMark Murray * Author: Tatu Ylonen <ylo@cs.hut.fi> 5511b41d2SMark Murray * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 6511b41d2SMark Murray * All rights reserved 7511b41d2SMark Murray * The main loop for the interactive session (client side). 8511b41d2SMark Murray * 9b66f2d16SKris Kennaway * As far as I am concerned, the code I have written for this software 10b66f2d16SKris Kennaway * can be used freely for any purpose. Any derived versions of this 11b66f2d16SKris Kennaway * software must be clearly marked as such, and if the derived work is 12b66f2d16SKris Kennaway * incompatible with the protocol description in the RFC file, it must be 13b66f2d16SKris Kennaway * called by a name other than "ssh" or "Secure Shell". 14b66f2d16SKris Kennaway * 15b66f2d16SKris Kennaway * 16b66f2d16SKris Kennaway * Copyright (c) 1999 Theo de Raadt. All rights reserved. 17b66f2d16SKris Kennaway * 18b66f2d16SKris Kennaway * Redistribution and use in source and binary forms, with or without 19b66f2d16SKris Kennaway * modification, are permitted provided that the following conditions 20b66f2d16SKris Kennaway * are met: 21b66f2d16SKris Kennaway * 1. Redistributions of source code must retain the above copyright 22b66f2d16SKris Kennaway * notice, this list of conditions and the following disclaimer. 23b66f2d16SKris Kennaway * 2. Redistributions in binary form must reproduce the above copyright 24b66f2d16SKris Kennaway * notice, this list of conditions and the following disclaimer in the 25b66f2d16SKris Kennaway * documentation and/or other materials provided with the distribution. 26b66f2d16SKris Kennaway * 27b66f2d16SKris Kennaway * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 28b66f2d16SKris Kennaway * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 29b66f2d16SKris Kennaway * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 30b66f2d16SKris Kennaway * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 31b66f2d16SKris Kennaway * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 32b66f2d16SKris Kennaway * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 33b66f2d16SKris Kennaway * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 34b66f2d16SKris Kennaway * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 35b66f2d16SKris Kennaway * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 36b66f2d16SKris Kennaway * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 37b66f2d16SKris Kennaway * 38b66f2d16SKris Kennaway * 39a04a10f8SKris Kennaway * SSH2 support added by Markus Friedl. 40ae1f160dSDag-Erling Smørgrav * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. 41b66f2d16SKris Kennaway * 42b66f2d16SKris Kennaway * Redistribution and use in source and binary forms, with or without 43b66f2d16SKris Kennaway * modification, are permitted provided that the following conditions 44b66f2d16SKris Kennaway * are met: 45b66f2d16SKris Kennaway * 1. Redistributions of source code must retain the above copyright 46b66f2d16SKris Kennaway * notice, this list of conditions and the following disclaimer. 47b66f2d16SKris Kennaway * 2. Redistributions in binary form must reproduce the above copyright 48b66f2d16SKris Kennaway * notice, this list of conditions and the following disclaimer in the 49b66f2d16SKris Kennaway * documentation and/or other materials provided with the distribution. 50b66f2d16SKris Kennaway * 51b66f2d16SKris Kennaway * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52b66f2d16SKris Kennaway * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 53b66f2d16SKris Kennaway * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 54b66f2d16SKris Kennaway * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 55b66f2d16SKris Kennaway * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 56b66f2d16SKris Kennaway * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 57b66f2d16SKris Kennaway * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 58b66f2d16SKris Kennaway * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 59b66f2d16SKris Kennaway * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 60b66f2d16SKris Kennaway * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 61511b41d2SMark Murray */ 62511b41d2SMark Murray 63511b41d2SMark Murray #include "includes.h" 64511b41d2SMark Murray 65761efaa7SDag-Erling Smørgrav #include <sys/types.h> 66761efaa7SDag-Erling Smørgrav #include <sys/ioctl.h> 67761efaa7SDag-Erling Smørgrav #include <sys/param.h> 68761efaa7SDag-Erling Smørgrav #ifdef HAVE_SYS_STAT_H 69761efaa7SDag-Erling Smørgrav # include <sys/stat.h> 70761efaa7SDag-Erling Smørgrav #endif 71761efaa7SDag-Erling Smørgrav #ifdef HAVE_SYS_TIME_H 72761efaa7SDag-Erling Smørgrav # include <sys/time.h> 73761efaa7SDag-Erling Smørgrav #endif 74761efaa7SDag-Erling Smørgrav #include <sys/socket.h> 75761efaa7SDag-Erling Smørgrav 76761efaa7SDag-Erling Smørgrav #include <ctype.h> 77761efaa7SDag-Erling Smørgrav #include <errno.h> 78761efaa7SDag-Erling Smørgrav #ifdef HAVE_PATHS_H 79761efaa7SDag-Erling Smørgrav #include <paths.h> 80761efaa7SDag-Erling Smørgrav #endif 81761efaa7SDag-Erling Smørgrav #include <signal.h> 82761efaa7SDag-Erling Smørgrav #include <stdarg.h> 83761efaa7SDag-Erling Smørgrav #include <stdio.h> 84761efaa7SDag-Erling Smørgrav #include <stdlib.h> 85761efaa7SDag-Erling Smørgrav #include <string.h> 86761efaa7SDag-Erling Smørgrav #include <termios.h> 87761efaa7SDag-Erling Smørgrav #include <pwd.h> 88761efaa7SDag-Erling Smørgrav #include <unistd.h> 89761efaa7SDag-Erling Smørgrav 90d4af9e69SDag-Erling Smørgrav #include "openbsd-compat/sys-queue.h" 91761efaa7SDag-Erling Smørgrav #include "xmalloc.h" 92511b41d2SMark Murray #include "ssh.h" 931e8db6e2SBrian Feldman #include "ssh1.h" 941e8db6e2SBrian Feldman #include "ssh2.h" 95511b41d2SMark Murray #include "packet.h" 96511b41d2SMark Murray #include "buffer.h" 97a04a10f8SKris Kennaway #include "compat.h" 98a04a10f8SKris Kennaway #include "channels.h" 99a04a10f8SKris Kennaway #include "dispatch.h" 1001e8db6e2SBrian Feldman #include "key.h" 101761efaa7SDag-Erling Smørgrav #include "cipher.h" 1021e8db6e2SBrian Feldman #include "kex.h" 1031e8db6e2SBrian Feldman #include "log.h" 1041e8db6e2SBrian Feldman #include "readconf.h" 1051e8db6e2SBrian Feldman #include "clientloop.h" 106021d409fSDag-Erling Smørgrav #include "sshconnect.h" 1071e8db6e2SBrian Feldman #include "authfd.h" 1081e8db6e2SBrian Feldman #include "atomicio.h" 109d74d50a8SDag-Erling Smørgrav #include "sshpty.h" 1101e8db6e2SBrian Feldman #include "misc.h" 111d74d50a8SDag-Erling Smørgrav #include "match.h" 112d74d50a8SDag-Erling Smørgrav #include "msg.h" 1137aee6ffeSDag-Erling Smørgrav #include "roaming.h" 1145b9b2fafSBrian Feldman 1155b9b2fafSBrian Feldman /* import options */ 1164899dde7SBrian Feldman extern Options options; 1174899dde7SBrian Feldman 118511b41d2SMark Murray /* Flag indicating that stdin should be redirected from /dev/null. */ 119511b41d2SMark Murray extern int stdin_null_flag; 120511b41d2SMark Murray 121efcad6b7SDag-Erling Smørgrav /* Flag indicating that no shell has been requested */ 122efcad6b7SDag-Erling Smørgrav extern int no_shell_flag; 123efcad6b7SDag-Erling Smørgrav 124d74d50a8SDag-Erling Smørgrav /* Control socket */ 125b15c8340SDag-Erling Smørgrav extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */ 126d74d50a8SDag-Erling Smørgrav 127511b41d2SMark Murray /* 128511b41d2SMark Murray * Name of the host we are connecting to. This is the name given on the 129511b41d2SMark Murray * command line, or the HostName specified for the user-supplied name in a 130511b41d2SMark Murray * configuration file. 131511b41d2SMark Murray */ 132511b41d2SMark Murray extern char *host; 133511b41d2SMark Murray 134511b41d2SMark Murray /* 135511b41d2SMark Murray * Flag to indicate that we have received a window change signal which has 136511b41d2SMark Murray * not yet been processed. This will cause a message indicating the new 137511b41d2SMark Murray * window size to be sent to the server a little later. This is volatile 138511b41d2SMark Murray * because this is updated in a signal handler. 139511b41d2SMark Murray */ 140ae1f160dSDag-Erling Smørgrav static volatile sig_atomic_t received_window_change_signal = 0; 141ae1f160dSDag-Erling Smørgrav static volatile sig_atomic_t received_signal = 0; 142511b41d2SMark Murray 143021d409fSDag-Erling Smørgrav /* Flag indicating whether the user's terminal is in non-blocking mode. */ 144511b41d2SMark Murray static int in_non_blocking_mode = 0; 145511b41d2SMark Murray 146e2f6069cSDag-Erling Smørgrav /* Time when backgrounded control master using ControlPersist should exit */ 147e2f6069cSDag-Erling Smørgrav static time_t control_persist_exit_time = 0; 148e2f6069cSDag-Erling Smørgrav 149511b41d2SMark Murray /* Common data for the client loop code. */ 150b15c8340SDag-Erling Smørgrav volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */ 151d4af9e69SDag-Erling Smørgrav static int escape_char1; /* Escape character. (proto1 only) */ 152d4af9e69SDag-Erling Smørgrav static int escape_pending1; /* Last character was an escape (proto1 only) */ 153511b41d2SMark Murray static int last_was_cr; /* Last character was a newline. */ 154d4af9e69SDag-Erling Smørgrav static int exit_status; /* Used to store the command exit status. */ 155d4af9e69SDag-Erling Smørgrav static int stdin_eof; /* EOF has been encountered on stderr. */ 156511b41d2SMark Murray static Buffer stdin_buffer; /* Buffer for stdin data. */ 157511b41d2SMark Murray static Buffer stdout_buffer; /* Buffer for stdout data. */ 158511b41d2SMark Murray static Buffer stderr_buffer; /* Buffer for stderr data. */ 1591e8db6e2SBrian Feldman static u_int buffer_high; /* Soft max buffer size. */ 160511b41d2SMark Murray static int connection_in; /* Connection to server (input). */ 161511b41d2SMark Murray static int connection_out; /* Connection to server (output). */ 1621e8db6e2SBrian Feldman static int need_rekeying; /* Set to non-zero if rekeying is requested. */ 163e2f6069cSDag-Erling Smørgrav static int session_closed; /* In SSH2: login session closed. */ 164e2f6069cSDag-Erling Smørgrav static int x11_refuse_time; /* If >0, refuse x11 opens after this time. */ 165a04a10f8SKris Kennaway 166ae1f160dSDag-Erling Smørgrav static void client_init_dispatch(void); 167a04a10f8SKris Kennaway int session_ident = -1; 168a04a10f8SKris Kennaway 169b15c8340SDag-Erling Smørgrav int session_resumed = 0; 170b15c8340SDag-Erling Smørgrav 171d4af9e69SDag-Erling Smørgrav /* Track escape per proto2 channel */ 172d4af9e69SDag-Erling Smørgrav struct escape_filter_ctx { 173d4af9e69SDag-Erling Smørgrav int escape_pending; 174d4af9e69SDag-Erling Smørgrav int escape_char; 175d74d50a8SDag-Erling Smørgrav }; 176d74d50a8SDag-Erling Smørgrav 177d4af9e69SDag-Erling Smørgrav /* Context for channel confirmation replies */ 178d4af9e69SDag-Erling Smørgrav struct channel_reply_ctx { 179d4af9e69SDag-Erling Smørgrav const char *request_type; 180*e146993eSDag-Erling Smørgrav int id; 181*e146993eSDag-Erling Smørgrav enum confirm_action action; 182d4af9e69SDag-Erling Smørgrav }; 183d4af9e69SDag-Erling Smørgrav 184d4af9e69SDag-Erling Smørgrav /* Global request success/failure callbacks */ 185d4af9e69SDag-Erling Smørgrav struct global_confirm { 186d4af9e69SDag-Erling Smørgrav TAILQ_ENTRY(global_confirm) entry; 187d4af9e69SDag-Erling Smørgrav global_confirm_cb *cb; 188d4af9e69SDag-Erling Smørgrav void *ctx; 189d4af9e69SDag-Erling Smørgrav int ref_count; 190d4af9e69SDag-Erling Smørgrav }; 191d4af9e69SDag-Erling Smørgrav TAILQ_HEAD(global_confirms, global_confirm); 192d4af9e69SDag-Erling Smørgrav static struct global_confirms global_confirms = 193d4af9e69SDag-Erling Smørgrav TAILQ_HEAD_INITIALIZER(global_confirms); 194d4af9e69SDag-Erling Smørgrav 1951e8db6e2SBrian Feldman /*XXX*/ 1961e8db6e2SBrian Feldman extern Kex *xxx_kex; 197511b41d2SMark Murray 198d74d50a8SDag-Erling Smørgrav void ssh_process_session2_setup(int, int, int, Buffer *); 199d74d50a8SDag-Erling Smørgrav 200511b41d2SMark Murray /* Restores stdin to blocking mode. */ 201511b41d2SMark Murray 202ae1f160dSDag-Erling Smørgrav static void 2031e8db6e2SBrian Feldman leave_non_blocking(void) 204511b41d2SMark Murray { 205511b41d2SMark Murray if (in_non_blocking_mode) { 206d74d50a8SDag-Erling Smørgrav unset_nonblock(fileno(stdin)); 207511b41d2SMark Murray in_non_blocking_mode = 0; 208511b41d2SMark Murray } 209511b41d2SMark Murray } 210511b41d2SMark Murray 211511b41d2SMark Murray /* Puts stdin terminal in non-blocking mode. */ 212511b41d2SMark Murray 213ae1f160dSDag-Erling Smørgrav static void 2141e8db6e2SBrian Feldman enter_non_blocking(void) 215511b41d2SMark Murray { 216511b41d2SMark Murray in_non_blocking_mode = 1; 217d74d50a8SDag-Erling Smørgrav set_nonblock(fileno(stdin)); 218511b41d2SMark Murray } 219511b41d2SMark Murray 220511b41d2SMark Murray /* 221511b41d2SMark Murray * Signal handler for the window change signal (SIGWINCH). This just sets a 222511b41d2SMark Murray * flag indicating that the window has changed. 223511b41d2SMark Murray */ 224761efaa7SDag-Erling Smørgrav /*ARGSUSED */ 225ae1f160dSDag-Erling Smørgrav static void 226511b41d2SMark Murray window_change_handler(int sig) 227511b41d2SMark Murray { 228511b41d2SMark Murray received_window_change_signal = 1; 229511b41d2SMark Murray signal(SIGWINCH, window_change_handler); 230511b41d2SMark Murray } 231511b41d2SMark Murray 232511b41d2SMark Murray /* 233511b41d2SMark Murray * Signal handler for signals that cause the program to terminate. These 234511b41d2SMark Murray * signals must be trapped to restore terminal modes. 235511b41d2SMark Murray */ 236761efaa7SDag-Erling Smørgrav /*ARGSUSED */ 237ae1f160dSDag-Erling Smørgrav static void 238511b41d2SMark Murray signal_handler(int sig) 239511b41d2SMark Murray { 240ae1f160dSDag-Erling Smørgrav received_signal = sig; 241ae1f160dSDag-Erling Smørgrav quit_pending = 1; 242511b41d2SMark Murray } 243511b41d2SMark Murray 244511b41d2SMark Murray /* 245511b41d2SMark Murray * Returns current time in seconds from Jan 1, 1970 with the maximum 246511b41d2SMark Murray * available resolution. 247511b41d2SMark Murray */ 248511b41d2SMark Murray 249ae1f160dSDag-Erling Smørgrav static double 2501e8db6e2SBrian Feldman get_current_time(void) 251511b41d2SMark Murray { 252511b41d2SMark Murray struct timeval tv; 253511b41d2SMark Murray gettimeofday(&tv, NULL); 254511b41d2SMark Murray return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; 255511b41d2SMark Murray } 256511b41d2SMark Murray 257e2f6069cSDag-Erling Smørgrav /* 258e2f6069cSDag-Erling Smørgrav * Sets control_persist_exit_time to the absolute time when the 259e2f6069cSDag-Erling Smørgrav * backgrounded control master should exit due to expiry of the 260e2f6069cSDag-Erling Smørgrav * ControlPersist timeout. Sets it to 0 if we are not a backgrounded 261e2f6069cSDag-Erling Smørgrav * control master process, or if there is no ControlPersist timeout. 262e2f6069cSDag-Erling Smørgrav */ 263e2f6069cSDag-Erling Smørgrav static void 264e2f6069cSDag-Erling Smørgrav set_control_persist_exit_time(void) 265e2f6069cSDag-Erling Smørgrav { 266e2f6069cSDag-Erling Smørgrav if (muxserver_sock == -1 || !options.control_persist 267*e146993eSDag-Erling Smørgrav || options.control_persist_timeout == 0) { 268e2f6069cSDag-Erling Smørgrav /* not using a ControlPersist timeout */ 269e2f6069cSDag-Erling Smørgrav control_persist_exit_time = 0; 270*e146993eSDag-Erling Smørgrav } else if (channel_still_open()) { 271e2f6069cSDag-Erling Smørgrav /* some client connections are still open */ 272e2f6069cSDag-Erling Smørgrav if (control_persist_exit_time > 0) 273e2f6069cSDag-Erling Smørgrav debug2("%s: cancel scheduled exit", __func__); 274e2f6069cSDag-Erling Smørgrav control_persist_exit_time = 0; 275e2f6069cSDag-Erling Smørgrav } else if (control_persist_exit_time <= 0) { 276e2f6069cSDag-Erling Smørgrav /* a client connection has recently closed */ 277e2f6069cSDag-Erling Smørgrav control_persist_exit_time = time(NULL) + 278e2f6069cSDag-Erling Smørgrav (time_t)options.control_persist_timeout; 279e2f6069cSDag-Erling Smørgrav debug2("%s: schedule exit in %d seconds", __func__, 280e2f6069cSDag-Erling Smørgrav options.control_persist_timeout); 281e2f6069cSDag-Erling Smørgrav } 282e2f6069cSDag-Erling Smørgrav /* else we are already counting down to the timeout */ 283e2f6069cSDag-Erling Smørgrav } 284e2f6069cSDag-Erling Smørgrav 285043840dfSDag-Erling Smørgrav #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" 286043840dfSDag-Erling Smørgrav void 287043840dfSDag-Erling Smørgrav client_x11_get_proto(const char *display, const char *xauth_path, 288e2f6069cSDag-Erling Smørgrav u_int trusted, u_int timeout, char **_proto, char **_data) 289043840dfSDag-Erling Smørgrav { 290043840dfSDag-Erling Smørgrav char cmd[1024]; 291043840dfSDag-Erling Smørgrav char line[512]; 292043840dfSDag-Erling Smørgrav char xdisplay[512]; 293043840dfSDag-Erling Smørgrav static char proto[512], data[512]; 294043840dfSDag-Erling Smørgrav FILE *f; 295043840dfSDag-Erling Smørgrav int got_data = 0, generated = 0, do_unlink = 0, i; 296043840dfSDag-Erling Smørgrav char *xauthdir, *xauthfile; 297043840dfSDag-Erling Smørgrav struct stat st; 298e2f6069cSDag-Erling Smørgrav u_int now; 299043840dfSDag-Erling Smørgrav 300043840dfSDag-Erling Smørgrav xauthdir = xauthfile = NULL; 301043840dfSDag-Erling Smørgrav *_proto = proto; 302043840dfSDag-Erling Smørgrav *_data = data; 303043840dfSDag-Erling Smørgrav proto[0] = data[0] = '\0'; 304043840dfSDag-Erling Smørgrav 305043840dfSDag-Erling Smørgrav if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { 306043840dfSDag-Erling Smørgrav debug("No xauth program."); 307043840dfSDag-Erling Smørgrav } else { 308043840dfSDag-Erling Smørgrav if (display == NULL) { 309043840dfSDag-Erling Smørgrav debug("x11_get_proto: DISPLAY not set"); 310043840dfSDag-Erling Smørgrav return; 311043840dfSDag-Erling Smørgrav } 312043840dfSDag-Erling Smørgrav /* 313043840dfSDag-Erling Smørgrav * Handle FamilyLocal case where $DISPLAY does 314043840dfSDag-Erling Smørgrav * not match an authorization entry. For this we 315043840dfSDag-Erling Smørgrav * just try "xauth list unix:displaynum.screennum". 316043840dfSDag-Erling Smørgrav * XXX: "localhost" match to determine FamilyLocal 317043840dfSDag-Erling Smørgrav * is not perfect. 318043840dfSDag-Erling Smørgrav */ 319043840dfSDag-Erling Smørgrav if (strncmp(display, "localhost:", 10) == 0) { 320043840dfSDag-Erling Smørgrav snprintf(xdisplay, sizeof(xdisplay), "unix:%s", 321043840dfSDag-Erling Smørgrav display + 10); 322043840dfSDag-Erling Smørgrav display = xdisplay; 323043840dfSDag-Erling Smørgrav } 324043840dfSDag-Erling Smørgrav if (trusted == 0) { 325043840dfSDag-Erling Smørgrav xauthdir = xmalloc(MAXPATHLEN); 326043840dfSDag-Erling Smørgrav xauthfile = xmalloc(MAXPATHLEN); 3274a421b63SDag-Erling Smørgrav mktemp_proto(xauthdir, MAXPATHLEN); 328043840dfSDag-Erling Smørgrav if (mkdtemp(xauthdir) != NULL) { 329043840dfSDag-Erling Smørgrav do_unlink = 1; 330043840dfSDag-Erling Smørgrav snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", 331043840dfSDag-Erling Smørgrav xauthdir); 332043840dfSDag-Erling Smørgrav snprintf(cmd, sizeof(cmd), 333043840dfSDag-Erling Smørgrav "%s -f %s generate %s " SSH_X11_PROTO 334e2f6069cSDag-Erling Smørgrav " untrusted timeout %u 2>" _PATH_DEVNULL, 335e2f6069cSDag-Erling Smørgrav xauth_path, xauthfile, display, timeout); 336043840dfSDag-Erling Smørgrav debug2("x11_get_proto: %s", cmd); 337043840dfSDag-Erling Smørgrav if (system(cmd) == 0) 338043840dfSDag-Erling Smørgrav generated = 1; 339e2f6069cSDag-Erling Smørgrav if (x11_refuse_time == 0) { 340e2f6069cSDag-Erling Smørgrav now = time(NULL) + 1; 341e2f6069cSDag-Erling Smørgrav if (UINT_MAX - timeout < now) 342e2f6069cSDag-Erling Smørgrav x11_refuse_time = UINT_MAX; 343e2f6069cSDag-Erling Smørgrav else 344e2f6069cSDag-Erling Smørgrav x11_refuse_time = now + timeout; 345e2f6069cSDag-Erling Smørgrav } 346043840dfSDag-Erling Smørgrav } 347043840dfSDag-Erling Smørgrav } 348d4af9e69SDag-Erling Smørgrav 349d4af9e69SDag-Erling Smørgrav /* 350d4af9e69SDag-Erling Smørgrav * When in untrusted mode, we read the cookie only if it was 351d4af9e69SDag-Erling Smørgrav * successfully generated as an untrusted one in the step 352d4af9e69SDag-Erling Smørgrav * above. 353d4af9e69SDag-Erling Smørgrav */ 354d4af9e69SDag-Erling Smørgrav if (trusted || generated) { 355043840dfSDag-Erling Smørgrav snprintf(cmd, sizeof(cmd), 356021d409fSDag-Erling Smørgrav "%s %s%s list %s 2>" _PATH_DEVNULL, 357043840dfSDag-Erling Smørgrav xauth_path, 358043840dfSDag-Erling Smørgrav generated ? "-f " : "" , 359043840dfSDag-Erling Smørgrav generated ? xauthfile : "", 360043840dfSDag-Erling Smørgrav display); 361043840dfSDag-Erling Smørgrav debug2("x11_get_proto: %s", cmd); 362043840dfSDag-Erling Smørgrav f = popen(cmd, "r"); 363043840dfSDag-Erling Smørgrav if (f && fgets(line, sizeof(line), f) && 364043840dfSDag-Erling Smørgrav sscanf(line, "%*s %511s %511s", proto, data) == 2) 365043840dfSDag-Erling Smørgrav got_data = 1; 366043840dfSDag-Erling Smørgrav if (f) 367043840dfSDag-Erling Smørgrav pclose(f); 368d4af9e69SDag-Erling Smørgrav } else 369d4af9e69SDag-Erling Smørgrav error("Warning: untrusted X11 forwarding setup failed: " 370d4af9e69SDag-Erling Smørgrav "xauth key data not generated"); 371043840dfSDag-Erling Smørgrav } 372043840dfSDag-Erling Smørgrav 373043840dfSDag-Erling Smørgrav if (do_unlink) { 374043840dfSDag-Erling Smørgrav unlink(xauthfile); 375043840dfSDag-Erling Smørgrav rmdir(xauthdir); 376043840dfSDag-Erling Smørgrav } 377043840dfSDag-Erling Smørgrav if (xauthdir) 378043840dfSDag-Erling Smørgrav xfree(xauthdir); 379043840dfSDag-Erling Smørgrav if (xauthfile) 380043840dfSDag-Erling Smørgrav xfree(xauthfile); 381043840dfSDag-Erling Smørgrav 382043840dfSDag-Erling Smørgrav /* 383043840dfSDag-Erling Smørgrav * If we didn't get authentication data, just make up some 384043840dfSDag-Erling Smørgrav * data. The forwarding code will check the validity of the 385043840dfSDag-Erling Smørgrav * response anyway, and substitute this data. The X11 386043840dfSDag-Erling Smørgrav * server, however, will ignore this fake data and use 387043840dfSDag-Erling Smørgrav * whatever authentication mechanisms it was using otherwise 388043840dfSDag-Erling Smørgrav * for the local connection. 389043840dfSDag-Erling Smørgrav */ 390043840dfSDag-Erling Smørgrav if (!got_data) { 391043840dfSDag-Erling Smørgrav u_int32_t rnd = 0; 392043840dfSDag-Erling Smørgrav 393043840dfSDag-Erling Smørgrav logit("Warning: No xauth data; " 394043840dfSDag-Erling Smørgrav "using fake authentication data for X11 forwarding."); 395043840dfSDag-Erling Smørgrav strlcpy(proto, SSH_X11_PROTO, sizeof proto); 396043840dfSDag-Erling Smørgrav for (i = 0; i < 16; i++) { 397043840dfSDag-Erling Smørgrav if (i % 4 == 0) 398043840dfSDag-Erling Smørgrav rnd = arc4random(); 399043840dfSDag-Erling Smørgrav snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", 400043840dfSDag-Erling Smørgrav rnd & 0xff); 401043840dfSDag-Erling Smørgrav rnd >>= 8; 402043840dfSDag-Erling Smørgrav } 403043840dfSDag-Erling Smørgrav } 404043840dfSDag-Erling Smørgrav } 405043840dfSDag-Erling Smørgrav 406511b41d2SMark Murray /* 407511b41d2SMark Murray * This is called when the interactive is entered. This checks if there is 408511b41d2SMark Murray * an EOF coming on stdin. We must check this explicitly, as select() does 409511b41d2SMark Murray * not appear to wake up when redirecting from /dev/null. 410511b41d2SMark Murray */ 411511b41d2SMark Murray 412ae1f160dSDag-Erling Smørgrav static void 4131e8db6e2SBrian Feldman client_check_initial_eof_on_stdin(void) 414511b41d2SMark Murray { 415511b41d2SMark Murray int len; 416511b41d2SMark Murray char buf[1]; 417511b41d2SMark Murray 418511b41d2SMark Murray /* 419511b41d2SMark Murray * If standard input is to be "redirected from /dev/null", we simply 420511b41d2SMark Murray * mark that we have seen an EOF and send an EOF message to the 421511b41d2SMark Murray * server. Otherwise, we try to read a single character; it appears 422511b41d2SMark Murray * that for some files, such /dev/null, select() never wakes up for 423511b41d2SMark Murray * read for this descriptor, which means that we never get EOF. This 424511b41d2SMark Murray * way we will get the EOF if stdin comes from /dev/null or similar. 425511b41d2SMark Murray */ 426511b41d2SMark Murray if (stdin_null_flag) { 427511b41d2SMark Murray /* Fake EOF on stdin. */ 428511b41d2SMark Murray debug("Sending eof."); 429511b41d2SMark Murray stdin_eof = 1; 430511b41d2SMark Murray packet_start(SSH_CMSG_EOF); 431511b41d2SMark Murray packet_send(); 432511b41d2SMark Murray } else { 433511b41d2SMark Murray enter_non_blocking(); 434511b41d2SMark Murray 435511b41d2SMark Murray /* Check for immediate EOF on stdin. */ 436511b41d2SMark Murray len = read(fileno(stdin), buf, 1); 437511b41d2SMark Murray if (len == 0) { 438d4af9e69SDag-Erling Smørgrav /* 439d4af9e69SDag-Erling Smørgrav * EOF. Record that we have seen it and send 440d4af9e69SDag-Erling Smørgrav * EOF to server. 441d4af9e69SDag-Erling Smørgrav */ 442511b41d2SMark Murray debug("Sending eof."); 443511b41d2SMark Murray stdin_eof = 1; 444511b41d2SMark Murray packet_start(SSH_CMSG_EOF); 445511b41d2SMark Murray packet_send(); 446511b41d2SMark Murray } else if (len > 0) { 447511b41d2SMark Murray /* 448511b41d2SMark Murray * Got data. We must store the data in the buffer, 449511b41d2SMark Murray * and also process it as an escape character if 450511b41d2SMark Murray * appropriate. 451511b41d2SMark Murray */ 452d4af9e69SDag-Erling Smørgrav if ((u_char) buf[0] == escape_char1) 453d4af9e69SDag-Erling Smørgrav escape_pending1 = 1; 4541e8db6e2SBrian Feldman else 455511b41d2SMark Murray buffer_append(&stdin_buffer, buf, 1); 456511b41d2SMark Murray } 457511b41d2SMark Murray leave_non_blocking(); 458511b41d2SMark Murray } 459511b41d2SMark Murray } 460511b41d2SMark Murray 461511b41d2SMark Murray 462511b41d2SMark Murray /* 463511b41d2SMark Murray * Make packets from buffered stdin data, and buffer them for sending to the 464511b41d2SMark Murray * connection. 465511b41d2SMark Murray */ 466511b41d2SMark Murray 467ae1f160dSDag-Erling Smørgrav static void 4681e8db6e2SBrian Feldman client_make_packets_from_stdin_data(void) 469511b41d2SMark Murray { 4701e8db6e2SBrian Feldman u_int len; 471511b41d2SMark Murray 472511b41d2SMark Murray /* Send buffered stdin data to the server. */ 473511b41d2SMark Murray while (buffer_len(&stdin_buffer) > 0 && 474511b41d2SMark Murray packet_not_very_much_data_to_write()) { 475511b41d2SMark Murray len = buffer_len(&stdin_buffer); 476511b41d2SMark Murray /* Keep the packets at reasonable size. */ 477511b41d2SMark Murray if (len > packet_get_maxsize()) 478511b41d2SMark Murray len = packet_get_maxsize(); 479511b41d2SMark Murray packet_start(SSH_CMSG_STDIN_DATA); 480511b41d2SMark Murray packet_put_string(buffer_ptr(&stdin_buffer), len); 481511b41d2SMark Murray packet_send(); 482511b41d2SMark Murray buffer_consume(&stdin_buffer, len); 483511b41d2SMark Murray /* If we have a pending EOF, send it now. */ 484511b41d2SMark Murray if (stdin_eof && buffer_len(&stdin_buffer) == 0) { 485511b41d2SMark Murray packet_start(SSH_CMSG_EOF); 486511b41d2SMark Murray packet_send(); 487511b41d2SMark Murray } 488511b41d2SMark Murray } 489511b41d2SMark Murray } 490511b41d2SMark Murray 491511b41d2SMark Murray /* 492511b41d2SMark Murray * Checks if the client window has changed, and sends a packet about it to 493511b41d2SMark Murray * the server if so. The actual change is detected elsewhere (by a software 494511b41d2SMark Murray * interrupt on Unix); this just checks the flag and sends a message if 495511b41d2SMark Murray * appropriate. 496511b41d2SMark Murray */ 497511b41d2SMark Murray 498ae1f160dSDag-Erling Smørgrav static void 4991e8db6e2SBrian Feldman client_check_window_change(void) 500511b41d2SMark Murray { 501511b41d2SMark Murray struct winsize ws; 502511b41d2SMark Murray 503a04a10f8SKris Kennaway if (! received_window_change_signal) 504a04a10f8SKris Kennaway return; 505a04a10f8SKris Kennaway /** XXX race */ 506511b41d2SMark Murray received_window_change_signal = 0; 507511b41d2SMark Murray 5085b9b2fafSBrian Feldman debug2("client_check_window_change: changed"); 509a04a10f8SKris Kennaway 510a04a10f8SKris Kennaway if (compat20) { 511d74d50a8SDag-Erling Smørgrav channel_send_window_changes(); 512a04a10f8SKris Kennaway } else { 513d74d50a8SDag-Erling Smørgrav if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) 514d74d50a8SDag-Erling Smørgrav return; 515511b41d2SMark Murray packet_start(SSH_CMSG_WINDOW_SIZE); 516761efaa7SDag-Erling Smørgrav packet_put_int((u_int)ws.ws_row); 517761efaa7SDag-Erling Smørgrav packet_put_int((u_int)ws.ws_col); 518761efaa7SDag-Erling Smørgrav packet_put_int((u_int)ws.ws_xpixel); 519761efaa7SDag-Erling Smørgrav packet_put_int((u_int)ws.ws_ypixel); 520511b41d2SMark Murray packet_send(); 521511b41d2SMark Murray } 522511b41d2SMark Murray } 523511b41d2SMark Murray 524efcad6b7SDag-Erling Smørgrav static void 525efcad6b7SDag-Erling Smørgrav client_global_request_reply(int type, u_int32_t seq, void *ctxt) 526efcad6b7SDag-Erling Smørgrav { 527d4af9e69SDag-Erling Smørgrav struct global_confirm *gc; 528d4af9e69SDag-Erling Smørgrav 529d4af9e69SDag-Erling Smørgrav if ((gc = TAILQ_FIRST(&global_confirms)) == NULL) 530d4af9e69SDag-Erling Smørgrav return; 531d4af9e69SDag-Erling Smørgrav if (gc->cb != NULL) 532d4af9e69SDag-Erling Smørgrav gc->cb(type, seq, gc->ctx); 533d4af9e69SDag-Erling Smørgrav if (--gc->ref_count <= 0) { 534d4af9e69SDag-Erling Smørgrav TAILQ_REMOVE(&global_confirms, gc, entry); 535d4af9e69SDag-Erling Smørgrav bzero(gc, sizeof(*gc)); 536d4af9e69SDag-Erling Smørgrav xfree(gc); 537d4af9e69SDag-Erling Smørgrav } 538d4af9e69SDag-Erling Smørgrav 5397aee6ffeSDag-Erling Smørgrav packet_set_alive_timeouts(0); 540efcad6b7SDag-Erling Smørgrav } 541efcad6b7SDag-Erling Smørgrav 542efcad6b7SDag-Erling Smørgrav static void 543efcad6b7SDag-Erling Smørgrav server_alive_check(void) 544efcad6b7SDag-Erling Smørgrav { 5457aee6ffeSDag-Erling Smørgrav if (packet_inc_alive_timeouts() > options.server_alive_count_max) { 5464a421b63SDag-Erling Smørgrav logit("Timeout, server %s not responding.", host); 54792eb0aa1SDag-Erling Smørgrav cleanup_exit(255); 54892eb0aa1SDag-Erling Smørgrav } 549efcad6b7SDag-Erling Smørgrav packet_start(SSH2_MSG_GLOBAL_REQUEST); 550efcad6b7SDag-Erling Smørgrav packet_put_cstring("keepalive@openssh.com"); 551efcad6b7SDag-Erling Smørgrav packet_put_char(1); /* boolean: want reply */ 552efcad6b7SDag-Erling Smørgrav packet_send(); 553d4af9e69SDag-Erling Smørgrav /* Insert an empty placeholder to maintain ordering */ 554d4af9e69SDag-Erling Smørgrav client_register_global_confirm(NULL, NULL); 555efcad6b7SDag-Erling Smørgrav } 556efcad6b7SDag-Erling Smørgrav 557511b41d2SMark Murray /* 558511b41d2SMark Murray * Waits until the client can do something (some data becomes available on 559511b41d2SMark Murray * one of the file descriptors). 560511b41d2SMark Murray */ 561ae1f160dSDag-Erling Smørgrav static void 5621e8db6e2SBrian Feldman client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, 563d74d50a8SDag-Erling Smørgrav int *maxfdp, u_int *nallocp, int rekeying) 564511b41d2SMark Murray { 565efcad6b7SDag-Erling Smørgrav struct timeval tv, *tvp; 566e2f6069cSDag-Erling Smørgrav int timeout_secs; 567efcad6b7SDag-Erling Smørgrav int ret; 568efcad6b7SDag-Erling Smørgrav 5691e8db6e2SBrian Feldman /* Add any selections by the channel mechanism. */ 570ae1f160dSDag-Erling Smørgrav channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); 571511b41d2SMark Murray 572a04a10f8SKris Kennaway if (!compat20) { 573511b41d2SMark Murray /* Read from the connection, unless our buffers are full. */ 574511b41d2SMark Murray if (buffer_len(&stdout_buffer) < buffer_high && 575511b41d2SMark Murray buffer_len(&stderr_buffer) < buffer_high && 576511b41d2SMark Murray channel_not_very_much_buffered_data()) 5771e8db6e2SBrian Feldman FD_SET(connection_in, *readsetp); 578511b41d2SMark Murray /* 579511b41d2SMark Murray * Read from stdin, unless we have seen EOF or have very much 580511b41d2SMark Murray * buffered data to send to the server. 581511b41d2SMark Murray */ 582511b41d2SMark Murray if (!stdin_eof && packet_not_very_much_data_to_write()) 5831e8db6e2SBrian Feldman FD_SET(fileno(stdin), *readsetp); 584511b41d2SMark Murray 585a04a10f8SKris Kennaway /* Select stdout/stderr if have data in buffer. */ 586a04a10f8SKris Kennaway if (buffer_len(&stdout_buffer) > 0) 5871e8db6e2SBrian Feldman FD_SET(fileno(stdout), *writesetp); 588a04a10f8SKris Kennaway if (buffer_len(&stderr_buffer) > 0) 5891e8db6e2SBrian Feldman FD_SET(fileno(stderr), *writesetp); 590a04a10f8SKris Kennaway } else { 591ae1f160dSDag-Erling Smørgrav /* channel_prepare_select could have closed the last channel */ 592ae1f160dSDag-Erling Smørgrav if (session_closed && !channel_still_open() && 593ae1f160dSDag-Erling Smørgrav !packet_have_data_to_write()) { 594ae1f160dSDag-Erling Smørgrav /* clear mask since we did not call select() */ 595ae1f160dSDag-Erling Smørgrav memset(*readsetp, 0, *nallocp); 596ae1f160dSDag-Erling Smørgrav memset(*writesetp, 0, *nallocp); 597ae1f160dSDag-Erling Smørgrav return; 598ae1f160dSDag-Erling Smørgrav } else { 5991e8db6e2SBrian Feldman FD_SET(connection_in, *readsetp); 600a04a10f8SKris Kennaway } 601ae1f160dSDag-Erling Smørgrav } 602511b41d2SMark Murray 603511b41d2SMark Murray /* Select server connection if have data to write to the server. */ 604511b41d2SMark Murray if (packet_have_data_to_write()) 6051e8db6e2SBrian Feldman FD_SET(connection_out, *writesetp); 606511b41d2SMark Murray 607511b41d2SMark Murray /* 608511b41d2SMark Murray * Wait for something to happen. This will suspend the process until 609511b41d2SMark Murray * some selected descriptor can be read, written, or has some other 610e2f6069cSDag-Erling Smørgrav * event pending, or a timeout expires. 611511b41d2SMark Murray */ 612511b41d2SMark Murray 613e2f6069cSDag-Erling Smørgrav timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */ 614e2f6069cSDag-Erling Smørgrav if (options.server_alive_interval > 0 && compat20) 615e2f6069cSDag-Erling Smørgrav timeout_secs = options.server_alive_interval; 616e2f6069cSDag-Erling Smørgrav set_control_persist_exit_time(); 617e2f6069cSDag-Erling Smørgrav if (control_persist_exit_time > 0) { 618e2f6069cSDag-Erling Smørgrav timeout_secs = MIN(timeout_secs, 619e2f6069cSDag-Erling Smørgrav control_persist_exit_time - time(NULL)); 620e2f6069cSDag-Erling Smørgrav if (timeout_secs < 0) 621e2f6069cSDag-Erling Smørgrav timeout_secs = 0; 622e2f6069cSDag-Erling Smørgrav } 623e2f6069cSDag-Erling Smørgrav if (timeout_secs == INT_MAX) 624efcad6b7SDag-Erling Smørgrav tvp = NULL; 625efcad6b7SDag-Erling Smørgrav else { 626e2f6069cSDag-Erling Smørgrav tv.tv_sec = timeout_secs; 627efcad6b7SDag-Erling Smørgrav tv.tv_usec = 0; 628efcad6b7SDag-Erling Smørgrav tvp = &tv; 629efcad6b7SDag-Erling Smørgrav } 630e2f6069cSDag-Erling Smørgrav 631efcad6b7SDag-Erling Smørgrav ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); 632efcad6b7SDag-Erling Smørgrav if (ret < 0) { 633511b41d2SMark Murray char buf[100]; 6341e8db6e2SBrian Feldman 6351e8db6e2SBrian Feldman /* 6361e8db6e2SBrian Feldman * We have to clear the select masks, because we return. 6371e8db6e2SBrian Feldman * We have to return, because the mainloop checks for the flags 6381e8db6e2SBrian Feldman * set by the signal handlers. 6391e8db6e2SBrian Feldman */ 640ae1f160dSDag-Erling Smørgrav memset(*readsetp, 0, *nallocp); 641ae1f160dSDag-Erling Smørgrav memset(*writesetp, 0, *nallocp); 6421e8db6e2SBrian Feldman 643511b41d2SMark Murray if (errno == EINTR) 644511b41d2SMark Murray return; 645511b41d2SMark Murray /* Note: we might still have data in the buffers. */ 646511b41d2SMark Murray snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); 647511b41d2SMark Murray buffer_append(&stderr_buffer, buf, strlen(buf)); 648511b41d2SMark Murray quit_pending = 1; 649efcad6b7SDag-Erling Smørgrav } else if (ret == 0) 650efcad6b7SDag-Erling Smørgrav server_alive_check(); 651511b41d2SMark Murray } 652511b41d2SMark Murray 653ae1f160dSDag-Erling Smørgrav static void 654b66f2d16SKris Kennaway client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) 655511b41d2SMark Murray { 656511b41d2SMark Murray /* Flush stdout and stderr buffers. */ 657b66f2d16SKris Kennaway if (buffer_len(bout) > 0) 658d4af9e69SDag-Erling Smørgrav atomicio(vwrite, fileno(stdout), buffer_ptr(bout), 659d4af9e69SDag-Erling Smørgrav buffer_len(bout)); 660b66f2d16SKris Kennaway if (buffer_len(berr) > 0) 661d4af9e69SDag-Erling Smørgrav atomicio(vwrite, fileno(stderr), buffer_ptr(berr), 662d4af9e69SDag-Erling Smørgrav buffer_len(berr)); 663511b41d2SMark Murray 664*e146993eSDag-Erling Smørgrav leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 665511b41d2SMark Murray 666511b41d2SMark Murray /* 667511b41d2SMark Murray * Free (and clear) the buffer to reduce the amount of data that gets 668511b41d2SMark Murray * written to swap. 669511b41d2SMark Murray */ 670b66f2d16SKris Kennaway buffer_free(bin); 671b66f2d16SKris Kennaway buffer_free(bout); 672b66f2d16SKris Kennaway buffer_free(berr); 673511b41d2SMark Murray 674511b41d2SMark Murray /* Send the suspend signal to the program itself. */ 675511b41d2SMark Murray kill(getpid(), SIGTSTP); 676511b41d2SMark Murray 6775e8dbd04SDag-Erling Smørgrav /* Reset window sizes in case they have changed */ 678511b41d2SMark Murray received_window_change_signal = 1; 679511b41d2SMark Murray 680511b41d2SMark Murray /* OK, we have been continued by the user. Reinitialize buffers. */ 681b66f2d16SKris Kennaway buffer_init(bin); 682b66f2d16SKris Kennaway buffer_init(bout); 683b66f2d16SKris Kennaway buffer_init(berr); 684511b41d2SMark Murray 685*e146993eSDag-Erling Smørgrav enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 686511b41d2SMark Murray } 687511b41d2SMark Murray 688ae1f160dSDag-Erling Smørgrav static void 689a04a10f8SKris Kennaway client_process_net_input(fd_set *readset) 690511b41d2SMark Murray { 6917aee6ffeSDag-Erling Smørgrav int len, cont = 0; 6927aee6ffeSDag-Erling Smørgrav char buf[SSH_IOBUFSZ]; 693511b41d2SMark Murray 694511b41d2SMark Murray /* 695511b41d2SMark Murray * Read input from the server, and add any such data to the buffer of 696511b41d2SMark Murray * the packet subsystem. 697511b41d2SMark Murray */ 698511b41d2SMark Murray if (FD_ISSET(connection_in, readset)) { 699511b41d2SMark Murray /* Read as much as possible. */ 7007aee6ffeSDag-Erling Smørgrav len = roaming_read(connection_in, buf, sizeof(buf), &cont); 7017aee6ffeSDag-Erling Smørgrav if (len == 0 && cont == 0) { 702d4af9e69SDag-Erling Smørgrav /* 703d4af9e69SDag-Erling Smørgrav * Received EOF. The remote host has closed the 704d4af9e69SDag-Erling Smørgrav * connection. 705d4af9e69SDag-Erling Smørgrav */ 706d4af9e69SDag-Erling Smørgrav snprintf(buf, sizeof buf, 707d4af9e69SDag-Erling Smørgrav "Connection to %.300s closed by remote host.\r\n", 708511b41d2SMark Murray host); 709511b41d2SMark Murray buffer_append(&stderr_buffer, buf, strlen(buf)); 710511b41d2SMark Murray quit_pending = 1; 711511b41d2SMark Murray return; 712511b41d2SMark Murray } 713511b41d2SMark Murray /* 714511b41d2SMark Murray * There is a kernel bug on Solaris that causes select to 715511b41d2SMark Murray * sometimes wake up even though there is no data available. 716511b41d2SMark Murray */ 717d4af9e69SDag-Erling Smørgrav if (len < 0 && 718d4af9e69SDag-Erling Smørgrav (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) 719511b41d2SMark Murray len = 0; 720511b41d2SMark Murray 721511b41d2SMark Murray if (len < 0) { 722d4af9e69SDag-Erling Smørgrav /* 723d4af9e69SDag-Erling Smørgrav * An error has encountered. Perhaps there is a 724d4af9e69SDag-Erling Smørgrav * network problem. 725d4af9e69SDag-Erling Smørgrav */ 726d4af9e69SDag-Erling Smørgrav snprintf(buf, sizeof buf, 727d4af9e69SDag-Erling Smørgrav "Read from remote host %.300s: %.100s\r\n", 728511b41d2SMark Murray host, strerror(errno)); 729511b41d2SMark Murray buffer_append(&stderr_buffer, buf, strlen(buf)); 730511b41d2SMark Murray quit_pending = 1; 731511b41d2SMark Murray return; 732511b41d2SMark Murray } 733511b41d2SMark Murray packet_process_incoming(buf, len); 734511b41d2SMark Murray } 735a04a10f8SKris Kennaway } 736a04a10f8SKris Kennaway 737545d5ecaSDag-Erling Smørgrav static void 738d4af9e69SDag-Erling Smørgrav client_status_confirm(int type, Channel *c, void *ctx) 739d74d50a8SDag-Erling Smørgrav { 740d4af9e69SDag-Erling Smørgrav struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx; 741d4af9e69SDag-Erling Smørgrav char errmsg[256]; 742d4af9e69SDag-Erling Smørgrav int tochan; 743d74d50a8SDag-Erling Smørgrav 744*e146993eSDag-Erling Smørgrav /* 745*e146993eSDag-Erling Smørgrav * If a TTY was explicitly requested, then a failure to allocate 746*e146993eSDag-Erling Smørgrav * one is fatal. 747*e146993eSDag-Erling Smørgrav */ 748*e146993eSDag-Erling Smørgrav if (cr->action == CONFIRM_TTY && 749*e146993eSDag-Erling Smørgrav (options.request_tty == REQUEST_TTY_FORCE || 750*e146993eSDag-Erling Smørgrav options.request_tty == REQUEST_TTY_YES)) 751*e146993eSDag-Erling Smørgrav cr->action = CONFIRM_CLOSE; 752*e146993eSDag-Erling Smørgrav 753d4af9e69SDag-Erling Smørgrav /* XXX supress on mux _client_ quietmode */ 754d4af9e69SDag-Erling Smørgrav tochan = options.log_level >= SYSLOG_LEVEL_ERROR && 755b15c8340SDag-Erling Smørgrav c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE; 756d74d50a8SDag-Erling Smørgrav 757d4af9e69SDag-Erling Smørgrav if (type == SSH2_MSG_CHANNEL_SUCCESS) { 758d4af9e69SDag-Erling Smørgrav debug2("%s request accepted on channel %d", 759d4af9e69SDag-Erling Smørgrav cr->request_type, c->self); 760d4af9e69SDag-Erling Smørgrav } else if (type == SSH2_MSG_CHANNEL_FAILURE) { 761d4af9e69SDag-Erling Smørgrav if (tochan) { 762d4af9e69SDag-Erling Smørgrav snprintf(errmsg, sizeof(errmsg), 763d4af9e69SDag-Erling Smørgrav "%s request failed\r\n", cr->request_type); 764d4af9e69SDag-Erling Smørgrav } else { 765d4af9e69SDag-Erling Smørgrav snprintf(errmsg, sizeof(errmsg), 766d4af9e69SDag-Erling Smørgrav "%s request failed on channel %d", 767d4af9e69SDag-Erling Smørgrav cr->request_type, c->self); 768d74d50a8SDag-Erling Smørgrav } 769d4af9e69SDag-Erling Smørgrav /* If error occurred on primary session channel, then exit */ 770*e146993eSDag-Erling Smørgrav if (cr->action == CONFIRM_CLOSE && c->self == session_ident) 771d4af9e69SDag-Erling Smørgrav fatal("%s", errmsg); 772*e146993eSDag-Erling Smørgrav /* 773*e146993eSDag-Erling Smørgrav * If error occurred on mux client, append to 774*e146993eSDag-Erling Smørgrav * their stderr. 775*e146993eSDag-Erling Smørgrav */ 776*e146993eSDag-Erling Smørgrav if (tochan) { 777*e146993eSDag-Erling Smørgrav buffer_append(&c->extended, errmsg, 778*e146993eSDag-Erling Smørgrav strlen(errmsg)); 779*e146993eSDag-Erling Smørgrav } else 780d4af9e69SDag-Erling Smørgrav error("%s", errmsg); 781*e146993eSDag-Erling Smørgrav if (cr->action == CONFIRM_TTY) { 782*e146993eSDag-Erling Smørgrav /* 783*e146993eSDag-Erling Smørgrav * If a TTY allocation error occurred, then arrange 784*e146993eSDag-Erling Smørgrav * for the correct TTY to leave raw mode. 785*e146993eSDag-Erling Smørgrav */ 786*e146993eSDag-Erling Smørgrav if (c->self == session_ident) 787*e146993eSDag-Erling Smørgrav leave_raw_mode(0); 788*e146993eSDag-Erling Smørgrav else 789*e146993eSDag-Erling Smørgrav mux_tty_alloc_failed(c); 790*e146993eSDag-Erling Smørgrav } else if (cr->action == CONFIRM_CLOSE) { 791d4af9e69SDag-Erling Smørgrav chan_read_failed(c); 792d4af9e69SDag-Erling Smørgrav chan_write_failed(c); 793d74d50a8SDag-Erling Smørgrav } 794d74d50a8SDag-Erling Smørgrav } 795d4af9e69SDag-Erling Smørgrav xfree(cr); 796d4af9e69SDag-Erling Smørgrav } 797d74d50a8SDag-Erling Smørgrav 798d74d50a8SDag-Erling Smørgrav static void 799d4af9e69SDag-Erling Smørgrav client_abandon_status_confirm(Channel *c, void *ctx) 800d74d50a8SDag-Erling Smørgrav { 801d4af9e69SDag-Erling Smørgrav xfree(ctx); 802d74d50a8SDag-Erling Smørgrav } 803d74d50a8SDag-Erling Smørgrav 804*e146993eSDag-Erling Smørgrav void 805*e146993eSDag-Erling Smørgrav client_expect_confirm(int id, const char *request, 806*e146993eSDag-Erling Smørgrav enum confirm_action action) 807d74d50a8SDag-Erling Smørgrav { 808d4af9e69SDag-Erling Smørgrav struct channel_reply_ctx *cr = xmalloc(sizeof(*cr)); 809d74d50a8SDag-Erling Smørgrav 810d4af9e69SDag-Erling Smørgrav cr->request_type = request; 811*e146993eSDag-Erling Smørgrav cr->action = action; 812d74d50a8SDag-Erling Smørgrav 813d4af9e69SDag-Erling Smørgrav channel_register_status_confirm(id, client_status_confirm, 814d4af9e69SDag-Erling Smørgrav client_abandon_status_confirm, cr); 815d4af9e69SDag-Erling Smørgrav } 816d4af9e69SDag-Erling Smørgrav 817d4af9e69SDag-Erling Smørgrav void 818d4af9e69SDag-Erling Smørgrav client_register_global_confirm(global_confirm_cb *cb, void *ctx) 819d4af9e69SDag-Erling Smørgrav { 820d4af9e69SDag-Erling Smørgrav struct global_confirm *gc, *last_gc; 821d4af9e69SDag-Erling Smørgrav 822d4af9e69SDag-Erling Smørgrav /* Coalesce identical callbacks */ 823d4af9e69SDag-Erling Smørgrav last_gc = TAILQ_LAST(&global_confirms, global_confirms); 824d4af9e69SDag-Erling Smørgrav if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) { 825d4af9e69SDag-Erling Smørgrav if (++last_gc->ref_count >= INT_MAX) 826d4af9e69SDag-Erling Smørgrav fatal("%s: last_gc->ref_count = %d", 827d4af9e69SDag-Erling Smørgrav __func__, last_gc->ref_count); 828d74d50a8SDag-Erling Smørgrav return; 829d74d50a8SDag-Erling Smørgrav } 830d74d50a8SDag-Erling Smørgrav 831d4af9e69SDag-Erling Smørgrav gc = xmalloc(sizeof(*gc)); 832d4af9e69SDag-Erling Smørgrav gc->cb = cb; 833d4af9e69SDag-Erling Smørgrav gc->ctx = ctx; 834d4af9e69SDag-Erling Smørgrav gc->ref_count = 1; 835d4af9e69SDag-Erling Smørgrav TAILQ_INSERT_TAIL(&global_confirms, gc, entry); 836d74d50a8SDag-Erling Smørgrav } 837d74d50a8SDag-Erling Smørgrav 838d74d50a8SDag-Erling Smørgrav static void 839545d5ecaSDag-Erling Smørgrav process_cmdline(void) 840545d5ecaSDag-Erling Smørgrav { 841545d5ecaSDag-Erling Smørgrav void (*handler)(int); 8425e8dbd04SDag-Erling Smørgrav char *s, *cmd, *cancel_host; 843d74d50a8SDag-Erling Smørgrav int delete = 0; 844cce7d346SDag-Erling Smørgrav int local = 0, remote = 0, dynamic = 0; 845cce7d346SDag-Erling Smørgrav int cancel_port; 8465e8dbd04SDag-Erling Smørgrav Forward fwd; 847545d5ecaSDag-Erling Smørgrav 848d4af9e69SDag-Erling Smørgrav bzero(&fwd, sizeof(fwd)); 849d4af9e69SDag-Erling Smørgrav fwd.listen_host = fwd.connect_host = NULL; 850d4af9e69SDag-Erling Smørgrav 851*e146993eSDag-Erling Smørgrav leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 852545d5ecaSDag-Erling Smørgrav handler = signal(SIGINT, SIG_IGN); 853545d5ecaSDag-Erling Smørgrav cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); 854545d5ecaSDag-Erling Smørgrav if (s == NULL) 855545d5ecaSDag-Erling Smørgrav goto out; 856d4af9e69SDag-Erling Smørgrav while (isspace(*s)) 857545d5ecaSDag-Erling Smørgrav s++; 858d74d50a8SDag-Erling Smørgrav if (*s == '-') 859d74d50a8SDag-Erling Smørgrav s++; /* Skip cmdline '-', if any */ 860d74d50a8SDag-Erling Smørgrav if (*s == '\0') 861545d5ecaSDag-Erling Smørgrav goto out; 862d74d50a8SDag-Erling Smørgrav 863d74d50a8SDag-Erling Smørgrav if (*s == 'h' || *s == 'H' || *s == '?') { 864d74d50a8SDag-Erling Smørgrav logit("Commands:"); 865761efaa7SDag-Erling Smørgrav logit(" -L[bind_address:]port:host:hostport " 866761efaa7SDag-Erling Smørgrav "Request local forward"); 867761efaa7SDag-Erling Smørgrav logit(" -R[bind_address:]port:host:hostport " 868761efaa7SDag-Erling Smørgrav "Request remote forward"); 869cce7d346SDag-Erling Smørgrav logit(" -D[bind_address:]port " 870cce7d346SDag-Erling Smørgrav "Request dynamic forward"); 871761efaa7SDag-Erling Smørgrav logit(" -KR[bind_address:]port " 872761efaa7SDag-Erling Smørgrav "Cancel remote forward"); 873021d409fSDag-Erling Smørgrav if (!options.permit_local_command) 874021d409fSDag-Erling Smørgrav goto out; 875761efaa7SDag-Erling Smørgrav logit(" !args " 876761efaa7SDag-Erling Smørgrav "Execute local command"); 877021d409fSDag-Erling Smørgrav goto out; 878021d409fSDag-Erling Smørgrav } 879021d409fSDag-Erling Smørgrav 880021d409fSDag-Erling Smørgrav if (*s == '!' && options.permit_local_command) { 881021d409fSDag-Erling Smørgrav s++; 882021d409fSDag-Erling Smørgrav ssh_local_cmd(s); 883d74d50a8SDag-Erling Smørgrav goto out; 884d74d50a8SDag-Erling Smørgrav } 885d74d50a8SDag-Erling Smørgrav 886d74d50a8SDag-Erling Smørgrav if (*s == 'K') { 887d74d50a8SDag-Erling Smørgrav delete = 1; 888d74d50a8SDag-Erling Smørgrav s++; 889d74d50a8SDag-Erling Smørgrav } 890cce7d346SDag-Erling Smørgrav if (*s == 'L') 891cce7d346SDag-Erling Smørgrav local = 1; 892cce7d346SDag-Erling Smørgrav else if (*s == 'R') 893cce7d346SDag-Erling Smørgrav remote = 1; 894cce7d346SDag-Erling Smørgrav else if (*s == 'D') 895cce7d346SDag-Erling Smørgrav dynamic = 1; 896cce7d346SDag-Erling Smørgrav else { 897d95e11bfSDag-Erling Smørgrav logit("Invalid command."); 898545d5ecaSDag-Erling Smørgrav goto out; 899545d5ecaSDag-Erling Smørgrav } 900cce7d346SDag-Erling Smørgrav 901cce7d346SDag-Erling Smørgrav if ((local || dynamic) && delete) { 902d74d50a8SDag-Erling Smørgrav logit("Not supported."); 903d74d50a8SDag-Erling Smørgrav goto out; 904d74d50a8SDag-Erling Smørgrav } 905cce7d346SDag-Erling Smørgrav if (remote && delete && !compat20) { 906d95e11bfSDag-Erling Smørgrav logit("Not supported for SSH protocol version 1."); 907545d5ecaSDag-Erling Smørgrav goto out; 908545d5ecaSDag-Erling Smørgrav } 909d74d50a8SDag-Erling Smørgrav 910d4af9e69SDag-Erling Smørgrav while (isspace(*++s)) 911d4af9e69SDag-Erling Smørgrav ; 912545d5ecaSDag-Erling Smørgrav 913b15c8340SDag-Erling Smørgrav /* XXX update list of forwards in options */ 914d74d50a8SDag-Erling Smørgrav if (delete) { 9155e8dbd04SDag-Erling Smørgrav cancel_port = 0; 9165e8dbd04SDag-Erling Smørgrav cancel_host = hpdelim(&s); /* may be NULL */ 9175e8dbd04SDag-Erling Smørgrav if (s != NULL) { 9185e8dbd04SDag-Erling Smørgrav cancel_port = a2port(s); 9195e8dbd04SDag-Erling Smørgrav cancel_host = cleanhostname(cancel_host); 920d74d50a8SDag-Erling Smørgrav } else { 9215e8dbd04SDag-Erling Smørgrav cancel_port = a2port(cancel_host); 9225e8dbd04SDag-Erling Smørgrav cancel_host = NULL; 9235e8dbd04SDag-Erling Smørgrav } 924cce7d346SDag-Erling Smørgrav if (cancel_port <= 0) { 9255e8dbd04SDag-Erling Smørgrav logit("Bad forwarding close port"); 926545d5ecaSDag-Erling Smørgrav goto out; 927545d5ecaSDag-Erling Smørgrav } 9285e8dbd04SDag-Erling Smørgrav channel_request_rforward_cancel(cancel_host, cancel_port); 9295e8dbd04SDag-Erling Smørgrav } else { 930cce7d346SDag-Erling Smørgrav if (!parse_forward(&fwd, s, dynamic, remote)) { 9315e8dbd04SDag-Erling Smørgrav logit("Bad forwarding specification."); 932545d5ecaSDag-Erling Smørgrav goto out; 933545d5ecaSDag-Erling Smørgrav } 934cce7d346SDag-Erling Smørgrav if (local || dynamic) { 9355e8dbd04SDag-Erling Smørgrav if (channel_setup_local_fwd_listener(fwd.listen_host, 9365e8dbd04SDag-Erling Smørgrav fwd.listen_port, fwd.connect_host, 9375e8dbd04SDag-Erling Smørgrav fwd.connect_port, options.gateway_ports) < 0) { 938d95e11bfSDag-Erling Smørgrav logit("Port forwarding failed."); 939545d5ecaSDag-Erling Smørgrav goto out; 940545d5ecaSDag-Erling Smørgrav } 9415e8dbd04SDag-Erling Smørgrav } else { 942761efaa7SDag-Erling Smørgrav if (channel_request_remote_forwarding(fwd.listen_host, 9435e8dbd04SDag-Erling Smørgrav fwd.listen_port, fwd.connect_host, 944761efaa7SDag-Erling Smørgrav fwd.connect_port) < 0) { 945761efaa7SDag-Erling Smørgrav logit("Port forwarding failed."); 946761efaa7SDag-Erling Smørgrav goto out; 947761efaa7SDag-Erling Smørgrav } 9485e8dbd04SDag-Erling Smørgrav } 9495e8dbd04SDag-Erling Smørgrav 950d95e11bfSDag-Erling Smørgrav logit("Forwarding port."); 951d74d50a8SDag-Erling Smørgrav } 952d74d50a8SDag-Erling Smørgrav 953545d5ecaSDag-Erling Smørgrav out: 954545d5ecaSDag-Erling Smørgrav signal(SIGINT, handler); 955*e146993eSDag-Erling Smørgrav enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 956545d5ecaSDag-Erling Smørgrav if (cmd) 957545d5ecaSDag-Erling Smørgrav xfree(cmd); 958d4af9e69SDag-Erling Smørgrav if (fwd.listen_host != NULL) 959d4af9e69SDag-Erling Smørgrav xfree(fwd.listen_host); 960d4af9e69SDag-Erling Smørgrav if (fwd.connect_host != NULL) 961d4af9e69SDag-Erling Smørgrav xfree(fwd.connect_host); 962545d5ecaSDag-Erling Smørgrav } 963545d5ecaSDag-Erling Smørgrav 964d4af9e69SDag-Erling Smørgrav /* 965d4af9e69SDag-Erling Smørgrav * Process the characters one by one, call with c==NULL for proto1 case. 966d4af9e69SDag-Erling Smørgrav */ 967ae1f160dSDag-Erling Smørgrav static int 968d4af9e69SDag-Erling Smørgrav process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr, 969d4af9e69SDag-Erling Smørgrav char *buf, int len) 970b66f2d16SKris Kennaway { 971b66f2d16SKris Kennaway char string[1024]; 972b66f2d16SKris Kennaway pid_t pid; 973b66f2d16SKris Kennaway int bytes = 0; 9741e8db6e2SBrian Feldman u_int i; 9751e8db6e2SBrian Feldman u_char ch; 976b66f2d16SKris Kennaway char *s; 977d4af9e69SDag-Erling Smørgrav int *escape_pendingp, escape_char; 978d4af9e69SDag-Erling Smørgrav struct escape_filter_ctx *efc; 979d4af9e69SDag-Erling Smørgrav 980d4af9e69SDag-Erling Smørgrav if (c == NULL) { 981d4af9e69SDag-Erling Smørgrav escape_pendingp = &escape_pending1; 982d4af9e69SDag-Erling Smørgrav escape_char = escape_char1; 983d4af9e69SDag-Erling Smørgrav } else { 984d4af9e69SDag-Erling Smørgrav if (c->filter_ctx == NULL) 985d4af9e69SDag-Erling Smørgrav return 0; 986d4af9e69SDag-Erling Smørgrav efc = (struct escape_filter_ctx *)c->filter_ctx; 987d4af9e69SDag-Erling Smørgrav escape_pendingp = &efc->escape_pending; 988d4af9e69SDag-Erling Smørgrav escape_char = efc->escape_char; 989d4af9e69SDag-Erling Smørgrav } 990b66f2d16SKris Kennaway 991043840dfSDag-Erling Smørgrav if (len <= 0) 992043840dfSDag-Erling Smørgrav return (0); 993043840dfSDag-Erling Smørgrav 994043840dfSDag-Erling Smørgrav for (i = 0; i < (u_int)len; i++) { 995b66f2d16SKris Kennaway /* Get one character at a time. */ 996b66f2d16SKris Kennaway ch = buf[i]; 997b66f2d16SKris Kennaway 998d4af9e69SDag-Erling Smørgrav if (*escape_pendingp) { 999b66f2d16SKris Kennaway /* We have previously seen an escape character. */ 1000b66f2d16SKris Kennaway /* Clear the flag now. */ 1001d4af9e69SDag-Erling Smørgrav *escape_pendingp = 0; 1002b66f2d16SKris Kennaway 1003b66f2d16SKris Kennaway /* Process the escaped character. */ 1004b66f2d16SKris Kennaway switch (ch) { 1005b66f2d16SKris Kennaway case '.': 1006b66f2d16SKris Kennaway /* Terminate the connection. */ 1007d4af9e69SDag-Erling Smørgrav snprintf(string, sizeof string, "%c.\r\n", 1008d4af9e69SDag-Erling Smørgrav escape_char); 1009b66f2d16SKris Kennaway buffer_append(berr, string, strlen(string)); 1010b66f2d16SKris Kennaway 1011b15c8340SDag-Erling Smørgrav if (c && c->ctl_chan != -1) { 1012d4af9e69SDag-Erling Smørgrav chan_read_failed(c); 1013d4af9e69SDag-Erling Smørgrav chan_write_failed(c); 1014d4af9e69SDag-Erling Smørgrav return 0; 1015d4af9e69SDag-Erling Smørgrav } else 1016b66f2d16SKris Kennaway quit_pending = 1; 1017b66f2d16SKris Kennaway return -1; 1018b66f2d16SKris Kennaway 1019b66f2d16SKris Kennaway case 'Z' - 64: 1020d4af9e69SDag-Erling Smørgrav /* XXX support this for mux clients */ 1021b15c8340SDag-Erling Smørgrav if (c && c->ctl_chan != -1) { 1022d4af9e69SDag-Erling Smørgrav noescape: 1023d4af9e69SDag-Erling Smørgrav snprintf(string, sizeof string, 1024d4af9e69SDag-Erling Smørgrav "%c%c escape not available to " 1025d4af9e69SDag-Erling Smørgrav "multiplexed sessions\r\n", 1026d4af9e69SDag-Erling Smørgrav escape_char, ch); 1027d4af9e69SDag-Erling Smørgrav buffer_append(berr, string, 1028d4af9e69SDag-Erling Smørgrav strlen(string)); 1029d4af9e69SDag-Erling Smørgrav continue; 1030d4af9e69SDag-Erling Smørgrav } 1031d4af9e69SDag-Erling Smørgrav /* Suspend the program. Inform the user */ 1032d4af9e69SDag-Erling Smørgrav snprintf(string, sizeof string, 1033d4af9e69SDag-Erling Smørgrav "%c^Z [suspend ssh]\r\n", escape_char); 1034b66f2d16SKris Kennaway buffer_append(berr, string, strlen(string)); 1035b66f2d16SKris Kennaway 1036b66f2d16SKris Kennaway /* Restore terminal modes and suspend. */ 1037b66f2d16SKris Kennaway client_suspend_self(bin, bout, berr); 1038b66f2d16SKris Kennaway 1039b66f2d16SKris Kennaway /* We have been continued. */ 1040b66f2d16SKris Kennaway continue; 1041b66f2d16SKris Kennaway 1042d95e11bfSDag-Erling Smørgrav case 'B': 1043d95e11bfSDag-Erling Smørgrav if (compat20) { 1044d95e11bfSDag-Erling Smørgrav snprintf(string, sizeof string, 1045d95e11bfSDag-Erling Smørgrav "%cB\r\n", escape_char); 1046d95e11bfSDag-Erling Smørgrav buffer_append(berr, string, 1047d95e11bfSDag-Erling Smørgrav strlen(string)); 1048d95e11bfSDag-Erling Smørgrav channel_request_start(session_ident, 1049d95e11bfSDag-Erling Smørgrav "break", 0); 1050d95e11bfSDag-Erling Smørgrav packet_put_int(1000); 1051d95e11bfSDag-Erling Smørgrav packet_send(); 1052d95e11bfSDag-Erling Smørgrav } 1053d95e11bfSDag-Erling Smørgrav continue; 1054d95e11bfSDag-Erling Smørgrav 10551e8db6e2SBrian Feldman case 'R': 10561e8db6e2SBrian Feldman if (compat20) { 10571e8db6e2SBrian Feldman if (datafellows & SSH_BUG_NOREKEY) 1058d4af9e69SDag-Erling Smørgrav logit("Server does not " 1059d4af9e69SDag-Erling Smørgrav "support re-keying"); 10601e8db6e2SBrian Feldman else 10611e8db6e2SBrian Feldman need_rekeying = 1; 10621e8db6e2SBrian Feldman } 10631e8db6e2SBrian Feldman continue; 10641e8db6e2SBrian Feldman 1065b66f2d16SKris Kennaway case '&': 1066b15c8340SDag-Erling Smørgrav if (c && c->ctl_chan != -1) 1067d4af9e69SDag-Erling Smørgrav goto noescape; 1068b66f2d16SKris Kennaway /* 1069d4af9e69SDag-Erling Smørgrav * Detach the program (continue to serve 1070d4af9e69SDag-Erling Smørgrav * connections, but put in background and no 1071d4af9e69SDag-Erling Smørgrav * more new connections). 1072b66f2d16SKris Kennaway */ 1073ae1f160dSDag-Erling Smørgrav /* Restore tty modes. */ 1074*e146993eSDag-Erling Smørgrav leave_raw_mode( 1075*e146993eSDag-Erling Smørgrav options.request_tty == REQUEST_TTY_FORCE); 1076ae1f160dSDag-Erling Smørgrav 1077ae1f160dSDag-Erling Smørgrav /* Stop listening for new connections. */ 1078ae1f160dSDag-Erling Smørgrav channel_stop_listening(); 1079ae1f160dSDag-Erling Smørgrav 1080ae1f160dSDag-Erling Smørgrav snprintf(string, sizeof string, 1081ae1f160dSDag-Erling Smørgrav "%c& [backgrounded]\n", escape_char); 1082ae1f160dSDag-Erling Smørgrav buffer_append(berr, string, strlen(string)); 1083ae1f160dSDag-Erling Smørgrav 1084ae1f160dSDag-Erling Smørgrav /* Fork into background. */ 1085ae1f160dSDag-Erling Smørgrav pid = fork(); 1086ae1f160dSDag-Erling Smørgrav if (pid < 0) { 1087ae1f160dSDag-Erling Smørgrav error("fork: %.100s", strerror(errno)); 1088ae1f160dSDag-Erling Smørgrav continue; 1089ae1f160dSDag-Erling Smørgrav } 1090ae1f160dSDag-Erling Smørgrav if (pid != 0) { /* This is the parent. */ 1091ae1f160dSDag-Erling Smørgrav /* The parent just exits. */ 1092ae1f160dSDag-Erling Smørgrav exit(0); 1093ae1f160dSDag-Erling Smørgrav } 1094ae1f160dSDag-Erling Smørgrav /* The child continues serving connections. */ 1095ae1f160dSDag-Erling Smørgrav if (compat20) { 1096ae1f160dSDag-Erling Smørgrav buffer_append(bin, "\004", 1); 1097ae1f160dSDag-Erling Smørgrav /* fake EOF on stdin */ 1098ae1f160dSDag-Erling Smørgrav return -1; 1099ae1f160dSDag-Erling Smørgrav } else if (!stdin_eof) { 1100b66f2d16SKris Kennaway /* 1101d4af9e69SDag-Erling Smørgrav * Sending SSH_CMSG_EOF alone does not 1102d4af9e69SDag-Erling Smørgrav * always appear to be enough. So we 1103d4af9e69SDag-Erling Smørgrav * try to send an EOF character first. 1104b66f2d16SKris Kennaway */ 1105b66f2d16SKris Kennaway packet_start(SSH_CMSG_STDIN_DATA); 1106b66f2d16SKris Kennaway packet_put_string("\004", 1); 1107b66f2d16SKris Kennaway packet_send(); 1108b66f2d16SKris Kennaway /* Close stdin. */ 1109b66f2d16SKris Kennaway stdin_eof = 1; 1110b66f2d16SKris Kennaway if (buffer_len(bin) == 0) { 1111b66f2d16SKris Kennaway packet_start(SSH_CMSG_EOF); 1112b66f2d16SKris Kennaway packet_send(); 1113b66f2d16SKris Kennaway } 1114b66f2d16SKris Kennaway } 1115b66f2d16SKris Kennaway continue; 1116b66f2d16SKris Kennaway 1117b66f2d16SKris Kennaway case '?': 1118b15c8340SDag-Erling Smørgrav if (c && c->ctl_chan != -1) { 1119b66f2d16SKris Kennaway snprintf(string, sizeof string, 1120b66f2d16SKris Kennaway "%c?\r\n\ 1121b66f2d16SKris Kennaway Supported escape sequences:\r\n\ 1122d4af9e69SDag-Erling Smørgrav %c. - terminate session\r\n\ 1123d4af9e69SDag-Erling Smørgrav %cB - send a BREAK to the remote system\r\n\ 1124d4af9e69SDag-Erling Smørgrav %cR - Request rekey (SSH protocol 2 only)\r\n\ 1125d4af9e69SDag-Erling Smørgrav %c# - list forwarded connections\r\n\ 1126d4af9e69SDag-Erling Smørgrav %c? - this message\r\n\ 1127d4af9e69SDag-Erling Smørgrav %c%c - send the escape character by typing it twice\r\n\ 1128d4af9e69SDag-Erling Smørgrav (Note that escapes are only recognized immediately after newline.)\r\n", 1129d4af9e69SDag-Erling Smørgrav escape_char, escape_char, 1130d4af9e69SDag-Erling Smørgrav escape_char, escape_char, 1131d4af9e69SDag-Erling Smørgrav escape_char, escape_char, 1132cce7d346SDag-Erling Smørgrav escape_char, escape_char); 1133d4af9e69SDag-Erling Smørgrav } else { 1134d4af9e69SDag-Erling Smørgrav snprintf(string, sizeof string, 1135d4af9e69SDag-Erling Smørgrav "%c?\r\n\ 1136d4af9e69SDag-Erling Smørgrav Supported escape sequences:\r\n\ 1137d4af9e69SDag-Erling Smørgrav %c. - terminate connection (and any multiplexed sessions)\r\n\ 1138d95e11bfSDag-Erling Smørgrav %cB - send a BREAK to the remote system\r\n\ 11394b17dab0SDag-Erling Smørgrav %cC - open a command line\r\n\ 11404b17dab0SDag-Erling Smørgrav %cR - Request rekey (SSH protocol 2 only)\r\n\ 11414b17dab0SDag-Erling Smørgrav %c^Z - suspend ssh\r\n\ 11424b17dab0SDag-Erling Smørgrav %c# - list forwarded connections\r\n\ 11434b17dab0SDag-Erling Smørgrav %c& - background ssh (when waiting for connections to terminate)\r\n\ 11444b17dab0SDag-Erling Smørgrav %c? - this message\r\n\ 11454b17dab0SDag-Erling Smørgrav %c%c - send the escape character by typing it twice\r\n\ 1146b66f2d16SKris Kennaway (Note that escapes are only recognized immediately after newline.)\r\n", 1147d4af9e69SDag-Erling Smørgrav escape_char, escape_char, 1148d4af9e69SDag-Erling Smørgrav escape_char, escape_char, 1149d4af9e69SDag-Erling Smørgrav escape_char, escape_char, 1150d4af9e69SDag-Erling Smørgrav escape_char, escape_char, 1151d4af9e69SDag-Erling Smørgrav escape_char, escape_char, 1152d4af9e69SDag-Erling Smørgrav escape_char); 1153d4af9e69SDag-Erling Smørgrav } 1154b66f2d16SKris Kennaway buffer_append(berr, string, strlen(string)); 1155b66f2d16SKris Kennaway continue; 1156b66f2d16SKris Kennaway 1157b66f2d16SKris Kennaway case '#': 1158d4af9e69SDag-Erling Smørgrav snprintf(string, sizeof string, "%c#\r\n", 1159d4af9e69SDag-Erling Smørgrav escape_char); 1160b66f2d16SKris Kennaway buffer_append(berr, string, strlen(string)); 1161b66f2d16SKris Kennaway s = channel_open_message(); 1162b66f2d16SKris Kennaway buffer_append(berr, s, strlen(s)); 1163b66f2d16SKris Kennaway xfree(s); 1164b66f2d16SKris Kennaway continue; 1165b66f2d16SKris Kennaway 1166545d5ecaSDag-Erling Smørgrav case 'C': 1167b15c8340SDag-Erling Smørgrav if (c && c->ctl_chan != -1) 1168cce7d346SDag-Erling Smørgrav goto noescape; 1169545d5ecaSDag-Erling Smørgrav process_cmdline(); 1170545d5ecaSDag-Erling Smørgrav continue; 1171545d5ecaSDag-Erling Smørgrav 1172b66f2d16SKris Kennaway default: 1173b66f2d16SKris Kennaway if (ch != escape_char) { 1174b66f2d16SKris Kennaway buffer_put_char(bin, escape_char); 1175b66f2d16SKris Kennaway bytes++; 1176b66f2d16SKris Kennaway } 1177b66f2d16SKris Kennaway /* Escaped characters fall through here */ 1178b66f2d16SKris Kennaway break; 1179b66f2d16SKris Kennaway } 1180b66f2d16SKris Kennaway } else { 1181b66f2d16SKris Kennaway /* 1182d4af9e69SDag-Erling Smørgrav * The previous character was not an escape char. 1183d4af9e69SDag-Erling Smørgrav * Check if this is an escape. 1184b66f2d16SKris Kennaway */ 1185b66f2d16SKris Kennaway if (last_was_cr && ch == escape_char) { 1186d4af9e69SDag-Erling Smørgrav /* 1187d4af9e69SDag-Erling Smørgrav * It is. Set the flag and continue to 1188d4af9e69SDag-Erling Smørgrav * next character. 1189d4af9e69SDag-Erling Smørgrav */ 1190d4af9e69SDag-Erling Smørgrav *escape_pendingp = 1; 1191b66f2d16SKris Kennaway continue; 1192b66f2d16SKris Kennaway } 1193b66f2d16SKris Kennaway } 1194b66f2d16SKris Kennaway 1195b66f2d16SKris Kennaway /* 1196b66f2d16SKris Kennaway * Normal character. Record whether it was a newline, 1197b66f2d16SKris Kennaway * and append it to the buffer. 1198b66f2d16SKris Kennaway */ 1199b66f2d16SKris Kennaway last_was_cr = (ch == '\r' || ch == '\n'); 1200b66f2d16SKris Kennaway buffer_put_char(bin, ch); 1201b66f2d16SKris Kennaway bytes++; 1202b66f2d16SKris Kennaway } 1203b66f2d16SKris Kennaway return bytes; 1204b66f2d16SKris Kennaway } 1205b66f2d16SKris Kennaway 1206ae1f160dSDag-Erling Smørgrav static void 1207a04a10f8SKris Kennaway client_process_input(fd_set *readset) 1208a04a10f8SKris Kennaway { 1209a04a10f8SKris Kennaway int len; 12107aee6ffeSDag-Erling Smørgrav char buf[SSH_IOBUFSZ]; 1211a04a10f8SKris Kennaway 1212511b41d2SMark Murray /* Read input from stdin. */ 1213511b41d2SMark Murray if (FD_ISSET(fileno(stdin), readset)) { 1214511b41d2SMark Murray /* Read as much as possible. */ 1215511b41d2SMark Murray len = read(fileno(stdin), buf, sizeof(buf)); 1216d4af9e69SDag-Erling Smørgrav if (len < 0 && 1217d4af9e69SDag-Erling Smørgrav (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) 12181e8db6e2SBrian Feldman return; /* we'll try again later */ 1219511b41d2SMark Murray if (len <= 0) { 1220511b41d2SMark Murray /* 1221511b41d2SMark Murray * Received EOF or error. They are treated 1222511b41d2SMark Murray * similarly, except that an error message is printed 1223511b41d2SMark Murray * if it was an error condition. 1224511b41d2SMark Murray */ 1225511b41d2SMark Murray if (len < 0) { 1226d4af9e69SDag-Erling Smørgrav snprintf(buf, sizeof buf, "read: %.100s\r\n", 1227d4af9e69SDag-Erling Smørgrav strerror(errno)); 1228511b41d2SMark Murray buffer_append(&stderr_buffer, buf, strlen(buf)); 1229511b41d2SMark Murray } 1230511b41d2SMark Murray /* Mark that we have seen EOF. */ 1231511b41d2SMark Murray stdin_eof = 1; 1232511b41d2SMark Murray /* 1233511b41d2SMark Murray * Send an EOF message to the server unless there is 1234511b41d2SMark Murray * data in the buffer. If there is data in the 1235511b41d2SMark Murray * buffer, no message will be sent now. Code 1236511b41d2SMark Murray * elsewhere will send the EOF when the buffer 1237511b41d2SMark Murray * becomes empty if stdin_eof is set. 1238511b41d2SMark Murray */ 1239511b41d2SMark Murray if (buffer_len(&stdin_buffer) == 0) { 1240511b41d2SMark Murray packet_start(SSH_CMSG_EOF); 1241511b41d2SMark Murray packet_send(); 1242511b41d2SMark Murray } 1243d4af9e69SDag-Erling Smørgrav } else if (escape_char1 == SSH_ESCAPECHAR_NONE) { 1244511b41d2SMark Murray /* 1245511b41d2SMark Murray * Normal successful read, and no escape character. 1246511b41d2SMark Murray * Just append the data to buffer. 1247511b41d2SMark Murray */ 1248511b41d2SMark Murray buffer_append(&stdin_buffer, buf, len); 1249511b41d2SMark Murray } else { 1250511b41d2SMark Murray /* 1251d4af9e69SDag-Erling Smørgrav * Normal, successful read. But we have an escape 1252d4af9e69SDag-Erling Smørgrav * character and have to process the characters one 1253d4af9e69SDag-Erling Smørgrav * by one. 1254511b41d2SMark Murray */ 1255d4af9e69SDag-Erling Smørgrav if (process_escapes(NULL, &stdin_buffer, 1256d4af9e69SDag-Erling Smørgrav &stdout_buffer, &stderr_buffer, buf, len) == -1) 1257511b41d2SMark Murray return; 1258511b41d2SMark Murray } 1259511b41d2SMark Murray } 1260511b41d2SMark Murray } 1261511b41d2SMark Murray 1262ae1f160dSDag-Erling Smørgrav static void 1263511b41d2SMark Murray client_process_output(fd_set *writeset) 1264511b41d2SMark Murray { 1265511b41d2SMark Murray int len; 1266511b41d2SMark Murray char buf[100]; 1267511b41d2SMark Murray 1268511b41d2SMark Murray /* Write buffered output to stdout. */ 1269511b41d2SMark Murray if (FD_ISSET(fileno(stdout), writeset)) { 1270511b41d2SMark Murray /* Write as much data as possible. */ 1271511b41d2SMark Murray len = write(fileno(stdout), buffer_ptr(&stdout_buffer), 1272511b41d2SMark Murray buffer_len(&stdout_buffer)); 1273511b41d2SMark Murray if (len <= 0) { 1274d4af9e69SDag-Erling Smørgrav if (errno == EINTR || errno == EAGAIN || 1275d4af9e69SDag-Erling Smørgrav errno == EWOULDBLOCK) 1276511b41d2SMark Murray len = 0; 1277511b41d2SMark Murray else { 1278511b41d2SMark Murray /* 1279511b41d2SMark Murray * An error or EOF was encountered. Put an 1280511b41d2SMark Murray * error message to stderr buffer. 1281511b41d2SMark Murray */ 1282d4af9e69SDag-Erling Smørgrav snprintf(buf, sizeof buf, 1283d4af9e69SDag-Erling Smørgrav "write stdout: %.50s\r\n", strerror(errno)); 1284511b41d2SMark Murray buffer_append(&stderr_buffer, buf, strlen(buf)); 1285511b41d2SMark Murray quit_pending = 1; 1286511b41d2SMark Murray return; 1287511b41d2SMark Murray } 1288511b41d2SMark Murray } 1289511b41d2SMark Murray /* Consume printed data from the buffer. */ 1290511b41d2SMark Murray buffer_consume(&stdout_buffer, len); 1291511b41d2SMark Murray } 1292511b41d2SMark Murray /* Write buffered output to stderr. */ 1293511b41d2SMark Murray if (FD_ISSET(fileno(stderr), writeset)) { 1294511b41d2SMark Murray /* Write as much data as possible. */ 1295511b41d2SMark Murray len = write(fileno(stderr), buffer_ptr(&stderr_buffer), 1296511b41d2SMark Murray buffer_len(&stderr_buffer)); 1297511b41d2SMark Murray if (len <= 0) { 1298d4af9e69SDag-Erling Smørgrav if (errno == EINTR || errno == EAGAIN || 1299d4af9e69SDag-Erling Smørgrav errno == EWOULDBLOCK) 1300511b41d2SMark Murray len = 0; 1301511b41d2SMark Murray else { 1302d4af9e69SDag-Erling Smørgrav /* 1303d4af9e69SDag-Erling Smørgrav * EOF or error, but can't even print 1304d4af9e69SDag-Erling Smørgrav * error message. 1305d4af9e69SDag-Erling Smørgrav */ 1306511b41d2SMark Murray quit_pending = 1; 1307511b41d2SMark Murray return; 1308511b41d2SMark Murray } 1309511b41d2SMark Murray } 1310511b41d2SMark Murray /* Consume printed characters from the buffer. */ 1311511b41d2SMark Murray buffer_consume(&stderr_buffer, len); 1312511b41d2SMark Murray } 1313511b41d2SMark Murray } 1314511b41d2SMark Murray 1315511b41d2SMark Murray /* 1316a04a10f8SKris Kennaway * Get packets from the connection input buffer, and process them as long as 1317a04a10f8SKris Kennaway * there are packets available. 1318a04a10f8SKris Kennaway * 1319a04a10f8SKris Kennaway * Any unknown packets received during the actual 1320a04a10f8SKris Kennaway * session cause the session to terminate. This is 1321a04a10f8SKris Kennaway * intended to make debugging easier since no 1322a04a10f8SKris Kennaway * confirmations are sent. Any compatible protocol 1323a04a10f8SKris Kennaway * extensions must be negotiated during the 1324a04a10f8SKris Kennaway * preparatory phase. 1325a04a10f8SKris Kennaway */ 1326a04a10f8SKris Kennaway 1327ae1f160dSDag-Erling Smørgrav static void 13281e8db6e2SBrian Feldman client_process_buffered_input_packets(void) 1329a04a10f8SKris Kennaway { 1330d4af9e69SDag-Erling Smørgrav dispatch_run(DISPATCH_NONBLOCK, &quit_pending, 1331d4af9e69SDag-Erling Smørgrav compat20 ? xxx_kex : NULL); 1332a04a10f8SKris Kennaway } 1333a04a10f8SKris Kennaway 1334b66f2d16SKris Kennaway /* scan buf[] for '~' before sending data to the peer */ 1335b66f2d16SKris Kennaway 1336d4af9e69SDag-Erling Smørgrav /* Helper: allocate a new escape_filter_ctx and fill in its escape char */ 1337d4af9e69SDag-Erling Smørgrav void * 1338d4af9e69SDag-Erling Smørgrav client_new_escape_filter_ctx(int escape_char) 1339b66f2d16SKris Kennaway { 1340d4af9e69SDag-Erling Smørgrav struct escape_filter_ctx *ret; 1341d4af9e69SDag-Erling Smørgrav 1342d4af9e69SDag-Erling Smørgrav ret = xmalloc(sizeof(*ret)); 1343d4af9e69SDag-Erling Smørgrav ret->escape_pending = 0; 1344d4af9e69SDag-Erling Smørgrav ret->escape_char = escape_char; 1345d4af9e69SDag-Erling Smørgrav return (void *)ret; 1346d4af9e69SDag-Erling Smørgrav } 1347d4af9e69SDag-Erling Smørgrav 1348d4af9e69SDag-Erling Smørgrav /* Free the escape filter context on channel free */ 1349d4af9e69SDag-Erling Smørgrav void 1350d4af9e69SDag-Erling Smørgrav client_filter_cleanup(int cid, void *ctx) 1351d4af9e69SDag-Erling Smørgrav { 1352d4af9e69SDag-Erling Smørgrav xfree(ctx); 1353d4af9e69SDag-Erling Smørgrav } 1354d4af9e69SDag-Erling Smørgrav 1355d4af9e69SDag-Erling Smørgrav int 1356d4af9e69SDag-Erling Smørgrav client_simple_escape_filter(Channel *c, char *buf, int len) 1357d4af9e69SDag-Erling Smørgrav { 1358d4af9e69SDag-Erling Smørgrav if (c->extended_usage != CHAN_EXTENDED_WRITE) 1359d4af9e69SDag-Erling Smørgrav return 0; 1360d4af9e69SDag-Erling Smørgrav 1361d4af9e69SDag-Erling Smørgrav return process_escapes(c, &c->input, &c->output, &c->extended, 1362d4af9e69SDag-Erling Smørgrav buf, len); 1363b66f2d16SKris Kennaway } 1364b66f2d16SKris Kennaway 1365ae1f160dSDag-Erling Smørgrav static void 13661e8db6e2SBrian Feldman client_channel_closed(int id, void *arg) 13671e8db6e2SBrian Feldman { 1368ae1f160dSDag-Erling Smørgrav channel_cancel_cleanup(id); 13691e8db6e2SBrian Feldman session_closed = 1; 1370*e146993eSDag-Erling Smørgrav leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 13711e8db6e2SBrian Feldman } 13721e8db6e2SBrian Feldman 1373a04a10f8SKris Kennaway /* 1374511b41d2SMark Murray * Implements the interactive session with the server. This is called after 1375511b41d2SMark Murray * the user has been authenticated, and a command has been started on the 1376ae1f160dSDag-Erling Smørgrav * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character 1377ae1f160dSDag-Erling Smørgrav * used as an escape character for terminating or suspending the session. 1378511b41d2SMark Murray */ 1379511b41d2SMark Murray 1380511b41d2SMark Murray int 1381b66f2d16SKris Kennaway client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) 1382511b41d2SMark Murray { 13831e8db6e2SBrian Feldman fd_set *readset = NULL, *writeset = NULL; 1384511b41d2SMark Murray double start_time, total_time; 1385d74d50a8SDag-Erling Smørgrav int max_fd = 0, max_fd2 = 0, len, rekeying = 0; 1386d4af9e69SDag-Erling Smørgrav u_int64_t ibytes, obytes; 1387d74d50a8SDag-Erling Smørgrav u_int nalloc = 0; 1388511b41d2SMark Murray char buf[100]; 1389511b41d2SMark Murray 1390511b41d2SMark Murray debug("Entering interactive session."); 1391511b41d2SMark Murray 1392511b41d2SMark Murray start_time = get_current_time(); 1393511b41d2SMark Murray 1394511b41d2SMark Murray /* Initialize variables. */ 1395d4af9e69SDag-Erling Smørgrav escape_pending1 = 0; 1396511b41d2SMark Murray last_was_cr = 1; 1397511b41d2SMark Murray exit_status = -1; 1398511b41d2SMark Murray stdin_eof = 0; 1399511b41d2SMark Murray buffer_high = 64 * 1024; 1400511b41d2SMark Murray connection_in = packet_get_connection_in(); 1401511b41d2SMark Murray connection_out = packet_get_connection_out(); 14021e8db6e2SBrian Feldman max_fd = MAX(connection_in, connection_out); 14031e8db6e2SBrian Feldman 14041e8db6e2SBrian Feldman if (!compat20) { 14051e8db6e2SBrian Feldman /* enable nonblocking unless tty */ 14061e8db6e2SBrian Feldman if (!isatty(fileno(stdin))) 14071e8db6e2SBrian Feldman set_nonblock(fileno(stdin)); 14081e8db6e2SBrian Feldman if (!isatty(fileno(stdout))) 14091e8db6e2SBrian Feldman set_nonblock(fileno(stdout)); 14101e8db6e2SBrian Feldman if (!isatty(fileno(stderr))) 14111e8db6e2SBrian Feldman set_nonblock(fileno(stderr)); 14121e8db6e2SBrian Feldman max_fd = MAX(max_fd, fileno(stdin)); 14131e8db6e2SBrian Feldman max_fd = MAX(max_fd, fileno(stdout)); 14141e8db6e2SBrian Feldman max_fd = MAX(max_fd, fileno(stderr)); 14151e8db6e2SBrian Feldman } 1416511b41d2SMark Murray quit_pending = 0; 1417d4af9e69SDag-Erling Smørgrav escape_char1 = escape_char_arg; 1418511b41d2SMark Murray 1419511b41d2SMark Murray /* Initialize buffers. */ 1420511b41d2SMark Murray buffer_init(&stdin_buffer); 1421511b41d2SMark Murray buffer_init(&stdout_buffer); 1422511b41d2SMark Murray buffer_init(&stderr_buffer); 1423511b41d2SMark Murray 1424a04a10f8SKris Kennaway client_init_dispatch(); 1425a04a10f8SKris Kennaway 1426d0c8c0bcSDag-Erling Smørgrav /* 1427d0c8c0bcSDag-Erling Smørgrav * Set signal handlers, (e.g. to restore non-blocking mode) 1428d0c8c0bcSDag-Erling Smørgrav * but don't overwrite SIG_IGN, matches behaviour from rsh(1) 1429d0c8c0bcSDag-Erling Smørgrav */ 14305e8dbd04SDag-Erling Smørgrav if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 14315e8dbd04SDag-Erling Smørgrav signal(SIGHUP, signal_handler); 1432d0c8c0bcSDag-Erling Smørgrav if (signal(SIGINT, SIG_IGN) != SIG_IGN) 1433511b41d2SMark Murray signal(SIGINT, signal_handler); 1434d0c8c0bcSDag-Erling Smørgrav if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) 1435511b41d2SMark Murray signal(SIGQUIT, signal_handler); 1436d0c8c0bcSDag-Erling Smørgrav if (signal(SIGTERM, SIG_IGN) != SIG_IGN) 1437511b41d2SMark Murray signal(SIGTERM, signal_handler); 1438511b41d2SMark Murray signal(SIGWINCH, window_change_handler); 1439511b41d2SMark Murray 1440511b41d2SMark Murray if (have_pty) 1441*e146993eSDag-Erling Smørgrav enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 1442511b41d2SMark Murray 14431e8db6e2SBrian Feldman if (compat20) { 14441e8db6e2SBrian Feldman session_ident = ssh2_chan_id; 1445*e146993eSDag-Erling Smørgrav if (session_ident != -1) { 1446*e146993eSDag-Erling Smørgrav if (escape_char_arg != SSH_ESCAPECHAR_NONE) { 14471e8db6e2SBrian Feldman channel_register_filter(session_ident, 1448d4af9e69SDag-Erling Smørgrav client_simple_escape_filter, NULL, 1449d4af9e69SDag-Erling Smørgrav client_filter_cleanup, 1450*e146993eSDag-Erling Smørgrav client_new_escape_filter_ctx( 1451*e146993eSDag-Erling Smørgrav escape_char_arg)); 1452*e146993eSDag-Erling Smørgrav } 14531e8db6e2SBrian Feldman channel_register_cleanup(session_ident, 1454021d409fSDag-Erling Smørgrav client_channel_closed, 0); 1455*e146993eSDag-Erling Smørgrav } 14561e8db6e2SBrian Feldman } else { 1457b66f2d16SKris Kennaway /* Check if we should immediately send eof on stdin. */ 1458511b41d2SMark Murray client_check_initial_eof_on_stdin(); 14591e8db6e2SBrian Feldman } 1460b66f2d16SKris Kennaway 1461511b41d2SMark Murray /* Main loop of the client for the interactive session mode. */ 1462511b41d2SMark Murray while (!quit_pending) { 1463511b41d2SMark Murray 1464511b41d2SMark Murray /* Process buffered packets sent by the server. */ 1465511b41d2SMark Murray client_process_buffered_input_packets(); 1466511b41d2SMark Murray 14671e8db6e2SBrian Feldman if (compat20 && session_closed && !channel_still_open()) 1468a04a10f8SKris Kennaway break; 1469a04a10f8SKris Kennaway 14701e8db6e2SBrian Feldman rekeying = (xxx_kex != NULL && !xxx_kex->done); 14711e8db6e2SBrian Feldman 14721e8db6e2SBrian Feldman if (rekeying) { 14731e8db6e2SBrian Feldman debug("rekeying in progress"); 14741e8db6e2SBrian Feldman } else { 1475511b41d2SMark Murray /* 14761e8db6e2SBrian Feldman * Make packets of buffered stdin data, and buffer 14771e8db6e2SBrian Feldman * them for sending to the server. 1478511b41d2SMark Murray */ 1479a04a10f8SKris Kennaway if (!compat20) 1480511b41d2SMark Murray client_make_packets_from_stdin_data(); 1481511b41d2SMark Murray 1482511b41d2SMark Murray /* 14831e8db6e2SBrian Feldman * Make packets from buffered channel data, and 14841e8db6e2SBrian Feldman * enqueue them for sending to the server. 1485511b41d2SMark Murray */ 1486511b41d2SMark Murray if (packet_not_very_much_data_to_write()) 1487511b41d2SMark Murray channel_output_poll(); 1488511b41d2SMark Murray 1489511b41d2SMark Murray /* 14901e8db6e2SBrian Feldman * Check if the window size has changed, and buffer a 14911e8db6e2SBrian Feldman * message about it to the server if so. 1492511b41d2SMark Murray */ 1493511b41d2SMark Murray client_check_window_change(); 1494511b41d2SMark Murray 1495511b41d2SMark Murray if (quit_pending) 1496511b41d2SMark Murray break; 14971e8db6e2SBrian Feldman } 1498511b41d2SMark Murray /* 1499511b41d2SMark Murray * Wait until we have something to do (something becomes 1500511b41d2SMark Murray * available on one of the descriptors). 1501511b41d2SMark Murray */ 1502ae1f160dSDag-Erling Smørgrav max_fd2 = max_fd; 15031e8db6e2SBrian Feldman client_wait_until_can_do_something(&readset, &writeset, 1504ae1f160dSDag-Erling Smørgrav &max_fd2, &nalloc, rekeying); 1505511b41d2SMark Murray 1506511b41d2SMark Murray if (quit_pending) 1507511b41d2SMark Murray break; 1508511b41d2SMark Murray 15091e8db6e2SBrian Feldman /* Do channel operations unless rekeying in progress. */ 15101e8db6e2SBrian Feldman if (!rekeying) { 15111e8db6e2SBrian Feldman channel_after_select(readset, writeset); 1512d95e11bfSDag-Erling Smørgrav if (need_rekeying || packet_need_rekeying()) { 1513d95e11bfSDag-Erling Smørgrav debug("need rekeying"); 15141e8db6e2SBrian Feldman xxx_kex->done = 0; 15151e8db6e2SBrian Feldman kex_send_kexinit(xxx_kex); 15161e8db6e2SBrian Feldman need_rekeying = 0; 15171e8db6e2SBrian Feldman } 15181e8db6e2SBrian Feldman } 1519511b41d2SMark Murray 1520a04a10f8SKris Kennaway /* Buffer input from the connection. */ 15211e8db6e2SBrian Feldman client_process_net_input(readset); 1522511b41d2SMark Murray 1523a04a10f8SKris Kennaway if (quit_pending) 1524a04a10f8SKris Kennaway break; 1525a04a10f8SKris Kennaway 1526a04a10f8SKris Kennaway if (!compat20) { 1527a04a10f8SKris Kennaway /* Buffer data from stdin */ 15281e8db6e2SBrian Feldman client_process_input(readset); 1529511b41d2SMark Murray /* 1530a04a10f8SKris Kennaway * Process output to stdout and stderr. Output to 1531a04a10f8SKris Kennaway * the connection is processed elsewhere (above). 1532511b41d2SMark Murray */ 15331e8db6e2SBrian Feldman client_process_output(writeset); 1534a04a10f8SKris Kennaway } 1535511b41d2SMark Murray 1536b15c8340SDag-Erling Smørgrav if (session_resumed) { 1537b15c8340SDag-Erling Smørgrav connection_in = packet_get_connection_in(); 1538b15c8340SDag-Erling Smørgrav connection_out = packet_get_connection_out(); 1539b15c8340SDag-Erling Smørgrav max_fd = MAX(max_fd, connection_out); 1540b15c8340SDag-Erling Smørgrav max_fd = MAX(max_fd, connection_in); 1541b15c8340SDag-Erling Smørgrav session_resumed = 0; 1542b15c8340SDag-Erling Smørgrav } 1543b15c8340SDag-Erling Smørgrav 1544d4af9e69SDag-Erling Smørgrav /* 1545d4af9e69SDag-Erling Smørgrav * Send as much buffered packet data as possible to the 1546d4af9e69SDag-Erling Smørgrav * sender. 1547d4af9e69SDag-Erling Smørgrav */ 15481e8db6e2SBrian Feldman if (FD_ISSET(connection_out, writeset)) 1549511b41d2SMark Murray packet_write_poll(); 1550e2f6069cSDag-Erling Smørgrav 1551e2f6069cSDag-Erling Smørgrav /* 1552e2f6069cSDag-Erling Smørgrav * If we are a backgrounded control master, and the 1553e2f6069cSDag-Erling Smørgrav * timeout has expired without any active client 1554e2f6069cSDag-Erling Smørgrav * connections, then quit. 1555e2f6069cSDag-Erling Smørgrav */ 1556e2f6069cSDag-Erling Smørgrav if (control_persist_exit_time > 0) { 1557e2f6069cSDag-Erling Smørgrav if (time(NULL) >= control_persist_exit_time) { 1558e2f6069cSDag-Erling Smørgrav debug("ControlPersist timeout expired"); 1559e2f6069cSDag-Erling Smørgrav break; 1560e2f6069cSDag-Erling Smørgrav } 1561e2f6069cSDag-Erling Smørgrav } 1562511b41d2SMark Murray } 15631e8db6e2SBrian Feldman if (readset) 15641e8db6e2SBrian Feldman xfree(readset); 15651e8db6e2SBrian Feldman if (writeset) 15661e8db6e2SBrian Feldman xfree(writeset); 1567511b41d2SMark Murray 1568511b41d2SMark Murray /* Terminate the session. */ 1569511b41d2SMark Murray 1570511b41d2SMark Murray /* Stop watching for window change. */ 1571511b41d2SMark Murray signal(SIGWINCH, SIG_DFL); 1572511b41d2SMark Murray 15737aee6ffeSDag-Erling Smørgrav if (compat20) { 15747aee6ffeSDag-Erling Smørgrav packet_start(SSH2_MSG_DISCONNECT); 15757aee6ffeSDag-Erling Smørgrav packet_put_int(SSH2_DISCONNECT_BY_APPLICATION); 15767aee6ffeSDag-Erling Smørgrav packet_put_cstring("disconnected by user"); 15778ad9b54aSDag-Erling Smørgrav packet_put_cstring(""); /* language tag */ 15787aee6ffeSDag-Erling Smørgrav packet_send(); 15797aee6ffeSDag-Erling Smørgrav packet_write_wait(); 15807aee6ffeSDag-Erling Smørgrav } 15817aee6ffeSDag-Erling Smørgrav 1582ae1f160dSDag-Erling Smørgrav channel_free_all(); 1583ae1f160dSDag-Erling Smørgrav 1584ae1f160dSDag-Erling Smørgrav if (have_pty) 1585*e146993eSDag-Erling Smørgrav leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 1586ae1f160dSDag-Erling Smørgrav 1587ae1f160dSDag-Erling Smørgrav /* restore blocking io */ 1588ae1f160dSDag-Erling Smørgrav if (!isatty(fileno(stdin))) 1589ae1f160dSDag-Erling Smørgrav unset_nonblock(fileno(stdin)); 1590ae1f160dSDag-Erling Smørgrav if (!isatty(fileno(stdout))) 1591ae1f160dSDag-Erling Smørgrav unset_nonblock(fileno(stdout)); 1592ae1f160dSDag-Erling Smørgrav if (!isatty(fileno(stderr))) 1593ae1f160dSDag-Erling Smørgrav unset_nonblock(fileno(stderr)); 1594ae1f160dSDag-Erling Smørgrav 1595efcad6b7SDag-Erling Smørgrav /* 1596efcad6b7SDag-Erling Smørgrav * If there was no shell or command requested, there will be no remote 1597efcad6b7SDag-Erling Smørgrav * exit status to be returned. In that case, clear error code if the 1598efcad6b7SDag-Erling Smørgrav * connection was deliberately terminated at this end. 1599efcad6b7SDag-Erling Smørgrav */ 1600efcad6b7SDag-Erling Smørgrav if (no_shell_flag && received_signal == SIGTERM) { 1601efcad6b7SDag-Erling Smørgrav received_signal = 0; 1602efcad6b7SDag-Erling Smørgrav exit_status = 0; 1603ae1f160dSDag-Erling Smørgrav } 1604511b41d2SMark Murray 1605efcad6b7SDag-Erling Smørgrav if (received_signal) 1606efcad6b7SDag-Erling Smørgrav fatal("Killed by signal %d.", (int) received_signal); 1607efcad6b7SDag-Erling Smørgrav 1608511b41d2SMark Murray /* 1609511b41d2SMark Murray * In interactive mode (with pseudo tty) display a message indicating 1610511b41d2SMark Murray * that the connection has been closed. 1611511b41d2SMark Murray */ 1612511b41d2SMark Murray if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { 1613d4af9e69SDag-Erling Smørgrav snprintf(buf, sizeof buf, 1614d4af9e69SDag-Erling Smørgrav "Connection to %.64s closed.\r\n", host); 1615511b41d2SMark Murray buffer_append(&stderr_buffer, buf, strlen(buf)); 1616511b41d2SMark Murray } 1617ae1f160dSDag-Erling Smørgrav 1618511b41d2SMark Murray /* Output any buffered data for stdout. */ 16194a421b63SDag-Erling Smørgrav if (buffer_len(&stdout_buffer) > 0) { 16204a421b63SDag-Erling Smørgrav len = atomicio(vwrite, fileno(stdout), 16214a421b63SDag-Erling Smørgrav buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer)); 16224a421b63SDag-Erling Smørgrav if (len < 0 || (u_int)len != buffer_len(&stdout_buffer)) 1623511b41d2SMark Murray error("Write failed flushing stdout buffer."); 16244a421b63SDag-Erling Smørgrav else 1625511b41d2SMark Murray buffer_consume(&stdout_buffer, len); 1626511b41d2SMark Murray } 1627511b41d2SMark Murray 1628511b41d2SMark Murray /* Output any buffered data for stderr. */ 16294a421b63SDag-Erling Smørgrav if (buffer_len(&stderr_buffer) > 0) { 16304a421b63SDag-Erling Smørgrav len = atomicio(vwrite, fileno(stderr), 16314a421b63SDag-Erling Smørgrav buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer)); 16324a421b63SDag-Erling Smørgrav if (len < 0 || (u_int)len != buffer_len(&stderr_buffer)) 1633511b41d2SMark Murray error("Write failed flushing stderr buffer."); 16344a421b63SDag-Erling Smørgrav else 1635511b41d2SMark Murray buffer_consume(&stderr_buffer, len); 1636511b41d2SMark Murray } 1637511b41d2SMark Murray 1638511b41d2SMark Murray /* Clear and free any buffers. */ 1639511b41d2SMark Murray memset(buf, 0, sizeof(buf)); 1640511b41d2SMark Murray buffer_free(&stdin_buffer); 1641511b41d2SMark Murray buffer_free(&stdout_buffer); 1642511b41d2SMark Murray buffer_free(&stderr_buffer); 1643511b41d2SMark Murray 1644511b41d2SMark Murray /* Report bytes transferred, and transfer rates. */ 1645511b41d2SMark Murray total_time = get_current_time() - start_time; 1646d4af9e69SDag-Erling Smørgrav packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes); 1647d4af9e69SDag-Erling Smørgrav packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes); 1648d4af9e69SDag-Erling Smørgrav verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds", 16494a421b63SDag-Erling Smørgrav (unsigned long long)obytes, (unsigned long long)ibytes, total_time); 1650511b41d2SMark Murray if (total_time > 0) 1651d4af9e69SDag-Erling Smørgrav verbose("Bytes per second: sent %.1f, received %.1f", 1652d4af9e69SDag-Erling Smørgrav obytes / total_time, ibytes / total_time); 1653511b41d2SMark Murray /* Return the exit status of the program. */ 1654511b41d2SMark Murray debug("Exit status %d", exit_status); 1655511b41d2SMark Murray return exit_status; 1656511b41d2SMark Murray } 1657a04a10f8SKris Kennaway 1658a04a10f8SKris Kennaway /*********/ 1659a04a10f8SKris Kennaway 1660ae1f160dSDag-Erling Smørgrav static void 1661ae1f160dSDag-Erling Smørgrav client_input_stdout_data(int type, u_int32_t seq, void *ctxt) 1662a04a10f8SKris Kennaway { 16631e8db6e2SBrian Feldman u_int data_len; 1664a04a10f8SKris Kennaway char *data = packet_get_string(&data_len); 1665ae1f160dSDag-Erling Smørgrav packet_check_eom(); 1666a04a10f8SKris Kennaway buffer_append(&stdout_buffer, data, data_len); 1667a04a10f8SKris Kennaway memset(data, 0, data_len); 1668a04a10f8SKris Kennaway xfree(data); 1669a04a10f8SKris Kennaway } 1670ae1f160dSDag-Erling Smørgrav static void 1671ae1f160dSDag-Erling Smørgrav client_input_stderr_data(int type, u_int32_t seq, void *ctxt) 1672a04a10f8SKris Kennaway { 16731e8db6e2SBrian Feldman u_int data_len; 1674a04a10f8SKris Kennaway char *data = packet_get_string(&data_len); 1675ae1f160dSDag-Erling Smørgrav packet_check_eom(); 1676a04a10f8SKris Kennaway buffer_append(&stderr_buffer, data, data_len); 1677a04a10f8SKris Kennaway memset(data, 0, data_len); 1678a04a10f8SKris Kennaway xfree(data); 1679a04a10f8SKris Kennaway } 1680ae1f160dSDag-Erling Smørgrav static void 1681ae1f160dSDag-Erling Smørgrav client_input_exit_status(int type, u_int32_t seq, void *ctxt) 1682a04a10f8SKris Kennaway { 1683a04a10f8SKris Kennaway exit_status = packet_get_int(); 1684ae1f160dSDag-Erling Smørgrav packet_check_eom(); 1685a04a10f8SKris Kennaway /* Acknowledge the exit. */ 1686a04a10f8SKris Kennaway packet_start(SSH_CMSG_EXIT_CONFIRMATION); 1687a04a10f8SKris Kennaway packet_send(); 1688a04a10f8SKris Kennaway /* 1689a04a10f8SKris Kennaway * Must wait for packet to be sent since we are 1690a04a10f8SKris Kennaway * exiting the loop. 1691a04a10f8SKris Kennaway */ 1692a04a10f8SKris Kennaway packet_write_wait(); 1693a04a10f8SKris Kennaway /* Flag that we want to exit. */ 1694a04a10f8SKris Kennaway quit_pending = 1; 1695a04a10f8SKris Kennaway } 1696efcad6b7SDag-Erling Smørgrav static void 1697efcad6b7SDag-Erling Smørgrav client_input_agent_open(int type, u_int32_t seq, void *ctxt) 1698efcad6b7SDag-Erling Smørgrav { 1699efcad6b7SDag-Erling Smørgrav Channel *c = NULL; 1700efcad6b7SDag-Erling Smørgrav int remote_id, sock; 1701efcad6b7SDag-Erling Smørgrav 1702efcad6b7SDag-Erling Smørgrav /* Read the remote channel number from the message. */ 1703efcad6b7SDag-Erling Smørgrav remote_id = packet_get_int(); 1704efcad6b7SDag-Erling Smørgrav packet_check_eom(); 1705efcad6b7SDag-Erling Smørgrav 1706efcad6b7SDag-Erling Smørgrav /* 1707efcad6b7SDag-Erling Smørgrav * Get a connection to the local authentication agent (this may again 1708efcad6b7SDag-Erling Smørgrav * get forwarded). 1709efcad6b7SDag-Erling Smørgrav */ 1710efcad6b7SDag-Erling Smørgrav sock = ssh_get_authentication_socket(); 1711efcad6b7SDag-Erling Smørgrav 1712efcad6b7SDag-Erling Smørgrav /* 1713efcad6b7SDag-Erling Smørgrav * If we could not connect the agent, send an error message back to 1714efcad6b7SDag-Erling Smørgrav * the server. This should never happen unless the agent dies, 1715efcad6b7SDag-Erling Smørgrav * because authentication forwarding is only enabled if we have an 1716efcad6b7SDag-Erling Smørgrav * agent. 1717efcad6b7SDag-Erling Smørgrav */ 1718efcad6b7SDag-Erling Smørgrav if (sock >= 0) { 1719efcad6b7SDag-Erling Smørgrav c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, 1720efcad6b7SDag-Erling Smørgrav -1, 0, 0, 0, "authentication agent connection", 1); 1721efcad6b7SDag-Erling Smørgrav c->remote_id = remote_id; 1722efcad6b7SDag-Erling Smørgrav c->force_drain = 1; 1723efcad6b7SDag-Erling Smørgrav } 1724efcad6b7SDag-Erling Smørgrav if (c == NULL) { 1725efcad6b7SDag-Erling Smørgrav packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); 1726efcad6b7SDag-Erling Smørgrav packet_put_int(remote_id); 1727efcad6b7SDag-Erling Smørgrav } else { 1728efcad6b7SDag-Erling Smørgrav /* Send a confirmation to the remote host. */ 1729efcad6b7SDag-Erling Smørgrav debug("Forwarding authentication connection."); 1730efcad6b7SDag-Erling Smørgrav packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); 1731efcad6b7SDag-Erling Smørgrav packet_put_int(remote_id); 1732efcad6b7SDag-Erling Smørgrav packet_put_int(c->self); 1733efcad6b7SDag-Erling Smørgrav } 1734efcad6b7SDag-Erling Smørgrav packet_send(); 1735efcad6b7SDag-Erling Smørgrav } 1736a04a10f8SKris Kennaway 1737ae1f160dSDag-Erling Smørgrav static Channel * 17381e8db6e2SBrian Feldman client_request_forwarded_tcpip(const char *request_type, int rchan) 17391e8db6e2SBrian Feldman { 17401e8db6e2SBrian Feldman Channel *c = NULL; 17411e8db6e2SBrian Feldman char *listen_address, *originator_address; 1742cce7d346SDag-Erling Smørgrav u_short listen_port, originator_port; 17431e8db6e2SBrian Feldman 17441e8db6e2SBrian Feldman /* Get rest of the packet */ 17451e8db6e2SBrian Feldman listen_address = packet_get_string(NULL); 17461e8db6e2SBrian Feldman listen_port = packet_get_int(); 17471e8db6e2SBrian Feldman originator_address = packet_get_string(NULL); 17481e8db6e2SBrian Feldman originator_port = packet_get_int(); 1749ae1f160dSDag-Erling Smørgrav packet_check_eom(); 17501e8db6e2SBrian Feldman 1751d4af9e69SDag-Erling Smørgrav debug("client_request_forwarded_tcpip: listen %s port %d, " 1752d4af9e69SDag-Erling Smørgrav "originator %s port %d", listen_address, listen_port, 1753d4af9e69SDag-Erling Smørgrav originator_address, originator_port); 17541e8db6e2SBrian Feldman 1755d4af9e69SDag-Erling Smørgrav c = channel_connect_by_listen_address(listen_port, 1756d4af9e69SDag-Erling Smørgrav "forwarded-tcpip", originator_address); 1757d4af9e69SDag-Erling Smørgrav 17581e8db6e2SBrian Feldman xfree(originator_address); 17591e8db6e2SBrian Feldman xfree(listen_address); 17601e8db6e2SBrian Feldman return c; 17611e8db6e2SBrian Feldman } 17621e8db6e2SBrian Feldman 1763ae1f160dSDag-Erling Smørgrav static Channel * 17641e8db6e2SBrian Feldman client_request_x11(const char *request_type, int rchan) 17651e8db6e2SBrian Feldman { 17661e8db6e2SBrian Feldman Channel *c = NULL; 17671e8db6e2SBrian Feldman char *originator; 1768cce7d346SDag-Erling Smørgrav u_short originator_port; 1769ae1f160dSDag-Erling Smørgrav int sock; 17701e8db6e2SBrian Feldman 17711e8db6e2SBrian Feldman if (!options.forward_x11) { 17721e8db6e2SBrian Feldman error("Warning: ssh server tried X11 forwarding."); 1773d4af9e69SDag-Erling Smørgrav error("Warning: this is probably a break-in attempt by a " 1774d4af9e69SDag-Erling Smørgrav "malicious server."); 17751e8db6e2SBrian Feldman return NULL; 17761e8db6e2SBrian Feldman } 1777e2f6069cSDag-Erling Smørgrav if (x11_refuse_time != 0 && time(NULL) >= x11_refuse_time) { 1778e2f6069cSDag-Erling Smørgrav verbose("Rejected X11 connection after ForwardX11Timeout " 1779e2f6069cSDag-Erling Smørgrav "expired"); 1780e2f6069cSDag-Erling Smørgrav return NULL; 1781e2f6069cSDag-Erling Smørgrav } 17821e8db6e2SBrian Feldman originator = packet_get_string(NULL); 17831e8db6e2SBrian Feldman if (datafellows & SSH_BUG_X11FWD) { 17841e8db6e2SBrian Feldman debug2("buggy server: x11 request w/o originator_port"); 17851e8db6e2SBrian Feldman originator_port = 0; 17861e8db6e2SBrian Feldman } else { 17871e8db6e2SBrian Feldman originator_port = packet_get_int(); 17881e8db6e2SBrian Feldman } 1789ae1f160dSDag-Erling Smørgrav packet_check_eom(); 17901e8db6e2SBrian Feldman /* XXX check permission */ 17911e8db6e2SBrian Feldman debug("client_request_x11: request from %s %d", originator, 17921e8db6e2SBrian Feldman originator_port); 1793ae1f160dSDag-Erling Smørgrav xfree(originator); 17941e8db6e2SBrian Feldman sock = x11_connect_display(); 1795ae1f160dSDag-Erling Smørgrav if (sock < 0) 1796ae1f160dSDag-Erling Smørgrav return NULL; 179789986192SBrooks Davis if (options.hpn_disabled) 179889986192SBrooks Davis c = channel_new("x11", SSH_CHANNEL_X11_OPEN, sock, sock, -1, 179989986192SBrooks Davis CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 180089986192SBrooks Davis 0, "x11", 1); 180189986192SBrooks Davis else 180289986192SBrooks Davis c = channel_new("x11", SSH_CHANNEL_X11_OPEN, sock, sock, -1, 180389986192SBrooks Davis options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 180489986192SBrooks Davis 0, "x11", 1); 1805ae1f160dSDag-Erling Smørgrav c->force_drain = 1; 18061e8db6e2SBrian Feldman return c; 18071e8db6e2SBrian Feldman } 18081e8db6e2SBrian Feldman 1809ae1f160dSDag-Erling Smørgrav static Channel * 18101e8db6e2SBrian Feldman client_request_agent(const char *request_type, int rchan) 18111e8db6e2SBrian Feldman { 18121e8db6e2SBrian Feldman Channel *c = NULL; 1813ae1f160dSDag-Erling Smørgrav int sock; 18141e8db6e2SBrian Feldman 18151e8db6e2SBrian Feldman if (!options.forward_agent) { 18161e8db6e2SBrian Feldman error("Warning: ssh server tried agent forwarding."); 1817d4af9e69SDag-Erling Smørgrav error("Warning: this is probably a break-in attempt by a " 1818d4af9e69SDag-Erling Smørgrav "malicious server."); 18191e8db6e2SBrian Feldman return NULL; 18201e8db6e2SBrian Feldman } 18211e8db6e2SBrian Feldman sock = ssh_get_authentication_socket(); 1822ae1f160dSDag-Erling Smørgrav if (sock < 0) 1823ae1f160dSDag-Erling Smørgrav return NULL; 182489986192SBrooks Davis if (options.hpn_disabled) 1825ae1f160dSDag-Erling Smørgrav c = channel_new("authentication agent connection", 18261e8db6e2SBrian Feldman SSH_CHANNEL_OPEN, sock, sock, -1, 182789986192SBrooks Davis CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, 182889986192SBrooks Davis "authentication agent connection", 1); 182989986192SBrooks Davis else 183089986192SBrooks Davis c = channel_new("authentication agent connection", 183189986192SBrooks Davis SSH_CHANNEL_OPEN, sock, sock, -1, 183289986192SBrooks Davis options.hpn_buffer_size, options.hpn_buffer_size, 0, 1833d95e11bfSDag-Erling Smørgrav "authentication agent connection", 1); 1834ae1f160dSDag-Erling Smørgrav c->force_drain = 1; 18351e8db6e2SBrian Feldman return c; 18361e8db6e2SBrian Feldman } 18371e8db6e2SBrian Feldman 1838d4af9e69SDag-Erling Smørgrav int 1839d4af9e69SDag-Erling Smørgrav client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun) 1840d4af9e69SDag-Erling Smørgrav { 1841d4af9e69SDag-Erling Smørgrav Channel *c; 1842d4af9e69SDag-Erling Smørgrav int fd; 1843d4af9e69SDag-Erling Smørgrav 1844d4af9e69SDag-Erling Smørgrav if (tun_mode == SSH_TUNMODE_NO) 1845d4af9e69SDag-Erling Smørgrav return 0; 1846d4af9e69SDag-Erling Smørgrav 1847d4af9e69SDag-Erling Smørgrav if (!compat20) { 1848cce7d346SDag-Erling Smørgrav error("Tunnel forwarding is not supported for protocol 1"); 1849d4af9e69SDag-Erling Smørgrav return -1; 1850d4af9e69SDag-Erling Smørgrav } 1851d4af9e69SDag-Erling Smørgrav 1852d4af9e69SDag-Erling Smørgrav debug("Requesting tun unit %d in mode %d", local_tun, tun_mode); 1853d4af9e69SDag-Erling Smørgrav 1854d4af9e69SDag-Erling Smørgrav /* Open local tunnel device */ 1855d4af9e69SDag-Erling Smørgrav if ((fd = tun_open(local_tun, tun_mode)) == -1) { 1856d4af9e69SDag-Erling Smørgrav error("Tunnel device open failed."); 1857d4af9e69SDag-Erling Smørgrav return -1; 1858d4af9e69SDag-Erling Smørgrav } 1859d4af9e69SDag-Erling Smørgrav 186089986192SBrooks Davis if (options.hpn_disabled) 1861d4af9e69SDag-Erling Smørgrav c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, 186289986192SBrooks Davis CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 186389986192SBrooks Davis 0, "tun", 1); 186489986192SBrooks Davis else 186589986192SBrooks Davis c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, 186689986192SBrooks Davis options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT, 186789986192SBrooks Davis 0, "tun", 1); 1868d4af9e69SDag-Erling Smørgrav c->datagram = 1; 1869d4af9e69SDag-Erling Smørgrav 1870d4af9e69SDag-Erling Smørgrav #if defined(SSH_TUN_FILTER) 1871d4af9e69SDag-Erling Smørgrav if (options.tun_open == SSH_TUNMODE_POINTOPOINT) 1872d4af9e69SDag-Erling Smørgrav channel_register_filter(c->self, sys_tun_infilter, 1873d4af9e69SDag-Erling Smørgrav sys_tun_outfilter, NULL, NULL); 1874d4af9e69SDag-Erling Smørgrav #endif 1875d4af9e69SDag-Erling Smørgrav 1876d4af9e69SDag-Erling Smørgrav packet_start(SSH2_MSG_CHANNEL_OPEN); 1877d4af9e69SDag-Erling Smørgrav packet_put_cstring("tun@openssh.com"); 1878d4af9e69SDag-Erling Smørgrav packet_put_int(c->self); 1879d4af9e69SDag-Erling Smørgrav packet_put_int(c->local_window_max); 1880d4af9e69SDag-Erling Smørgrav packet_put_int(c->local_maxpacket); 1881d4af9e69SDag-Erling Smørgrav packet_put_int(tun_mode); 1882d4af9e69SDag-Erling Smørgrav packet_put_int(remote_tun); 1883d4af9e69SDag-Erling Smørgrav packet_send(); 1884d4af9e69SDag-Erling Smørgrav 1885d4af9e69SDag-Erling Smørgrav return 0; 1886d4af9e69SDag-Erling Smørgrav } 1887d4af9e69SDag-Erling Smørgrav 1888a04a10f8SKris Kennaway /* XXXX move to generic input handler */ 1889ae1f160dSDag-Erling Smørgrav static void 1890ae1f160dSDag-Erling Smørgrav client_input_channel_open(int type, u_int32_t seq, void *ctxt) 1891a04a10f8SKris Kennaway { 1892a04a10f8SKris Kennaway Channel *c = NULL; 1893a04a10f8SKris Kennaway char *ctype; 1894a04a10f8SKris Kennaway int rchan; 1895ee21a45fSDag-Erling Smørgrav u_int rmaxpack, rwindow, len; 1896a04a10f8SKris Kennaway 1897a04a10f8SKris Kennaway ctype = packet_get_string(&len); 1898a04a10f8SKris Kennaway rchan = packet_get_int(); 1899a04a10f8SKris Kennaway rwindow = packet_get_int(); 1900a04a10f8SKris Kennaway rmaxpack = packet_get_int(); 1901a04a10f8SKris Kennaway 1902a04a10f8SKris Kennaway debug("client_input_channel_open: ctype %s rchan %d win %d max %d", 1903a04a10f8SKris Kennaway ctype, rchan, rwindow, rmaxpack); 1904a04a10f8SKris Kennaway 19051e8db6e2SBrian Feldman if (strcmp(ctype, "forwarded-tcpip") == 0) { 19061e8db6e2SBrian Feldman c = client_request_forwarded_tcpip(ctype, rchan); 19071e8db6e2SBrian Feldman } else if (strcmp(ctype, "x11") == 0) { 19081e8db6e2SBrian Feldman c = client_request_x11(ctype, rchan); 19091e8db6e2SBrian Feldman } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { 19101e8db6e2SBrian Feldman c = client_request_agent(ctype, rchan); 1911a04a10f8SKris Kennaway } 1912a04a10f8SKris Kennaway /* XXX duplicate : */ 1913a04a10f8SKris Kennaway if (c != NULL) { 1914a04a10f8SKris Kennaway debug("confirm %s", ctype); 1915a04a10f8SKris Kennaway c->remote_id = rchan; 1916a04a10f8SKris Kennaway c->remote_window = rwindow; 1917a04a10f8SKris Kennaway c->remote_maxpacket = rmaxpack; 1918ae1f160dSDag-Erling Smørgrav if (c->type != SSH_CHANNEL_CONNECTING) { 1919a04a10f8SKris Kennaway packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); 1920a04a10f8SKris Kennaway packet_put_int(c->remote_id); 1921a04a10f8SKris Kennaway packet_put_int(c->self); 1922a04a10f8SKris Kennaway packet_put_int(c->local_window); 1923a04a10f8SKris Kennaway packet_put_int(c->local_maxpacket); 1924a04a10f8SKris Kennaway packet_send(); 1925ae1f160dSDag-Erling Smørgrav } 1926a04a10f8SKris Kennaway } else { 1927a04a10f8SKris Kennaway debug("failure %s", ctype); 1928a04a10f8SKris Kennaway packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); 1929a04a10f8SKris Kennaway packet_put_int(rchan); 1930a04a10f8SKris Kennaway packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); 1931ae1f160dSDag-Erling Smørgrav if (!(datafellows & SSH_BUG_OPENFAILURE)) { 1932ae1f160dSDag-Erling Smørgrav packet_put_cstring("open failed"); 1933a04a10f8SKris Kennaway packet_put_cstring(""); 1934ae1f160dSDag-Erling Smørgrav } 1935a04a10f8SKris Kennaway packet_send(); 1936a04a10f8SKris Kennaway } 1937a04a10f8SKris Kennaway xfree(ctype); 1938a04a10f8SKris Kennaway } 1939ae1f160dSDag-Erling Smørgrav static void 1940ae1f160dSDag-Erling Smørgrav client_input_channel_req(int type, u_int32_t seq, void *ctxt) 19411e8db6e2SBrian Feldman { 19421e8db6e2SBrian Feldman Channel *c = NULL; 1943d74d50a8SDag-Erling Smørgrav int exitval, id, reply, success = 0; 19441e8db6e2SBrian Feldman char *rtype; 19451e8db6e2SBrian Feldman 19461e8db6e2SBrian Feldman id = packet_get_int(); 19471e8db6e2SBrian Feldman rtype = packet_get_string(NULL); 19481e8db6e2SBrian Feldman reply = packet_get_char(); 19491e8db6e2SBrian Feldman 19501e8db6e2SBrian Feldman debug("client_input_channel_req: channel %d rtype %s reply %d", 19511e8db6e2SBrian Feldman id, rtype, reply); 19521e8db6e2SBrian Feldman 1953d74d50a8SDag-Erling Smørgrav if (id == -1) { 1954d74d50a8SDag-Erling Smørgrav error("client_input_channel_req: request for channel -1"); 1955d74d50a8SDag-Erling Smørgrav } else if ((c = channel_lookup(id)) == NULL) { 1956d4af9e69SDag-Erling Smørgrav error("client_input_channel_req: channel %d: " 1957d4af9e69SDag-Erling Smørgrav "unknown channel", id); 1958d4af9e69SDag-Erling Smørgrav } else if (strcmp(rtype, "eow@openssh.com") == 0) { 1959d4af9e69SDag-Erling Smørgrav packet_check_eom(); 1960d4af9e69SDag-Erling Smørgrav chan_rcvd_eow(c); 19611e8db6e2SBrian Feldman } else if (strcmp(rtype, "exit-status") == 0) { 1962d74d50a8SDag-Erling Smørgrav exitval = packet_get_int(); 1963b15c8340SDag-Erling Smørgrav if (c->ctl_chan != -1) { 1964b15c8340SDag-Erling Smørgrav mux_exit_message(c, exitval); 1965b15c8340SDag-Erling Smørgrav success = 1; 1966b15c8340SDag-Erling Smørgrav } else if (id == session_ident) { 1967b15c8340SDag-Erling Smørgrav /* Record exit value of local session */ 19681e8db6e2SBrian Feldman success = 1; 1969d74d50a8SDag-Erling Smørgrav exit_status = exitval; 1970d74d50a8SDag-Erling Smørgrav } else { 1971b15c8340SDag-Erling Smørgrav /* Probably for a mux channel that has already closed */ 1972b15c8340SDag-Erling Smørgrav debug("%s: no sink for exit-status on channel %d", 1973b15c8340SDag-Erling Smørgrav __func__, id); 1974d74d50a8SDag-Erling Smørgrav } 1975ae1f160dSDag-Erling Smørgrav packet_check_eom(); 19761e8db6e2SBrian Feldman } 19774a421b63SDag-Erling Smørgrav if (reply && c != NULL) { 19781e8db6e2SBrian Feldman packet_start(success ? 19791e8db6e2SBrian Feldman SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); 1980cce7d346SDag-Erling Smørgrav packet_put_int(c->remote_id); 19811e8db6e2SBrian Feldman packet_send(); 19821e8db6e2SBrian Feldman } 19831e8db6e2SBrian Feldman xfree(rtype); 19841e8db6e2SBrian Feldman } 1985ae1f160dSDag-Erling Smørgrav static void 1986ae1f160dSDag-Erling Smørgrav client_input_global_request(int type, u_int32_t seq, void *ctxt) 1987ae1f160dSDag-Erling Smørgrav { 1988ae1f160dSDag-Erling Smørgrav char *rtype; 1989ae1f160dSDag-Erling Smørgrav int want_reply; 1990ae1f160dSDag-Erling Smørgrav int success = 0; 1991a04a10f8SKris Kennaway 1992ae1f160dSDag-Erling Smørgrav rtype = packet_get_string(NULL); 1993ae1f160dSDag-Erling Smørgrav want_reply = packet_get_char(); 1994efcad6b7SDag-Erling Smørgrav debug("client_input_global_request: rtype %s want_reply %d", 1995efcad6b7SDag-Erling Smørgrav rtype, want_reply); 1996ae1f160dSDag-Erling Smørgrav if (want_reply) { 1997ae1f160dSDag-Erling Smørgrav packet_start(success ? 1998ae1f160dSDag-Erling Smørgrav SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); 1999ae1f160dSDag-Erling Smørgrav packet_send(); 2000ae1f160dSDag-Erling Smørgrav packet_write_wait(); 2001ae1f160dSDag-Erling Smørgrav } 2002ae1f160dSDag-Erling Smørgrav xfree(rtype); 2003ae1f160dSDag-Erling Smørgrav } 2004ae1f160dSDag-Erling Smørgrav 2005d74d50a8SDag-Erling Smørgrav void 2006d74d50a8SDag-Erling Smørgrav client_session2_setup(int id, int want_tty, int want_subsystem, 2007d4af9e69SDag-Erling Smørgrav const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env) 2008d74d50a8SDag-Erling Smørgrav { 2009d74d50a8SDag-Erling Smørgrav int len; 20105e8dbd04SDag-Erling Smørgrav Channel *c = NULL; 2011d74d50a8SDag-Erling Smørgrav 2012d74d50a8SDag-Erling Smørgrav debug2("%s: id %d", __func__, id); 2013d74d50a8SDag-Erling Smørgrav 20145e8dbd04SDag-Erling Smørgrav if ((c = channel_lookup(id)) == NULL) 20155e8dbd04SDag-Erling Smørgrav fatal("client_session2_setup: channel %d: unknown channel", id); 20165e8dbd04SDag-Erling Smørgrav 20174a421b63SDag-Erling Smørgrav packet_set_interactive(want_tty, 20184a421b63SDag-Erling Smørgrav options.ip_qos_interactive, options.ip_qos_bulk); 20194a421b63SDag-Erling Smørgrav 2020d74d50a8SDag-Erling Smørgrav if (want_tty) { 2021d74d50a8SDag-Erling Smørgrav struct winsize ws; 2022d74d50a8SDag-Erling Smørgrav 2023d74d50a8SDag-Erling Smørgrav /* Store window size in the packet. */ 2024d74d50a8SDag-Erling Smørgrav if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) 2025d74d50a8SDag-Erling Smørgrav memset(&ws, 0, sizeof(ws)); 2026d74d50a8SDag-Erling Smørgrav 2027d4af9e69SDag-Erling Smørgrav channel_request_start(id, "pty-req", 1); 2028*e146993eSDag-Erling Smørgrav client_expect_confirm(id, "PTY allocation", CONFIRM_TTY); 2029d74d50a8SDag-Erling Smørgrav packet_put_cstring(term != NULL ? term : ""); 2030761efaa7SDag-Erling Smørgrav packet_put_int((u_int)ws.ws_col); 2031761efaa7SDag-Erling Smørgrav packet_put_int((u_int)ws.ws_row); 2032761efaa7SDag-Erling Smørgrav packet_put_int((u_int)ws.ws_xpixel); 2033761efaa7SDag-Erling Smørgrav packet_put_int((u_int)ws.ws_ypixel); 2034d4af9e69SDag-Erling Smørgrav if (tiop == NULL) 2035d4af9e69SDag-Erling Smørgrav tiop = get_saved_tio(); 2036d4af9e69SDag-Erling Smørgrav tty_make_modes(-1, tiop); 2037d74d50a8SDag-Erling Smørgrav packet_send(); 2038d74d50a8SDag-Erling Smørgrav /* XXX wait for reply */ 20395e8dbd04SDag-Erling Smørgrav c->client_tty = 1; 2040d74d50a8SDag-Erling Smørgrav } 2041d74d50a8SDag-Erling Smørgrav 2042d74d50a8SDag-Erling Smørgrav /* Transfer any environment variables from client to server */ 2043d74d50a8SDag-Erling Smørgrav if (options.num_send_env != 0 && env != NULL) { 2044d74d50a8SDag-Erling Smørgrav int i, j, matched; 2045d74d50a8SDag-Erling Smørgrav char *name, *val; 2046d74d50a8SDag-Erling Smørgrav 2047d74d50a8SDag-Erling Smørgrav debug("Sending environment."); 2048d74d50a8SDag-Erling Smørgrav for (i = 0; env[i] != NULL; i++) { 2049d74d50a8SDag-Erling Smørgrav /* Split */ 2050d74d50a8SDag-Erling Smørgrav name = xstrdup(env[i]); 2051d74d50a8SDag-Erling Smørgrav if ((val = strchr(name, '=')) == NULL) { 2052021d409fSDag-Erling Smørgrav xfree(name); 2053d74d50a8SDag-Erling Smørgrav continue; 2054d74d50a8SDag-Erling Smørgrav } 2055d74d50a8SDag-Erling Smørgrav *val++ = '\0'; 2056d74d50a8SDag-Erling Smørgrav 2057d74d50a8SDag-Erling Smørgrav matched = 0; 2058d74d50a8SDag-Erling Smørgrav for (j = 0; j < options.num_send_env; j++) { 2059d74d50a8SDag-Erling Smørgrav if (match_pattern(name, options.send_env[j])) { 2060d74d50a8SDag-Erling Smørgrav matched = 1; 2061d74d50a8SDag-Erling Smørgrav break; 2062d74d50a8SDag-Erling Smørgrav } 2063d74d50a8SDag-Erling Smørgrav } 2064d74d50a8SDag-Erling Smørgrav if (!matched) { 2065d74d50a8SDag-Erling Smørgrav debug3("Ignored env %s", name); 2066021d409fSDag-Erling Smørgrav xfree(name); 2067d74d50a8SDag-Erling Smørgrav continue; 2068d74d50a8SDag-Erling Smørgrav } 2069d74d50a8SDag-Erling Smørgrav 2070d74d50a8SDag-Erling Smørgrav debug("Sending env %s = %s", name, val); 2071d74d50a8SDag-Erling Smørgrav channel_request_start(id, "env", 0); 2072d74d50a8SDag-Erling Smørgrav packet_put_cstring(name); 2073d74d50a8SDag-Erling Smørgrav packet_put_cstring(val); 2074d74d50a8SDag-Erling Smørgrav packet_send(); 2075021d409fSDag-Erling Smørgrav xfree(name); 2076d74d50a8SDag-Erling Smørgrav } 2077d74d50a8SDag-Erling Smørgrav } 2078d74d50a8SDag-Erling Smørgrav 2079d74d50a8SDag-Erling Smørgrav len = buffer_len(cmd); 2080d74d50a8SDag-Erling Smørgrav if (len > 0) { 2081d74d50a8SDag-Erling Smørgrav if (len > 900) 2082d74d50a8SDag-Erling Smørgrav len = 900; 2083d74d50a8SDag-Erling Smørgrav if (want_subsystem) { 2084d4af9e69SDag-Erling Smørgrav debug("Sending subsystem: %.*s", 2085d4af9e69SDag-Erling Smørgrav len, (u_char*)buffer_ptr(cmd)); 2086d4af9e69SDag-Erling Smørgrav channel_request_start(id, "subsystem", 1); 2087*e146993eSDag-Erling Smørgrav client_expect_confirm(id, "subsystem", CONFIRM_CLOSE); 2088d74d50a8SDag-Erling Smørgrav } else { 2089d4af9e69SDag-Erling Smørgrav debug("Sending command: %.*s", 2090d4af9e69SDag-Erling Smørgrav len, (u_char*)buffer_ptr(cmd)); 2091d4af9e69SDag-Erling Smørgrav channel_request_start(id, "exec", 1); 2092*e146993eSDag-Erling Smørgrav client_expect_confirm(id, "exec", CONFIRM_CLOSE); 2093d74d50a8SDag-Erling Smørgrav } 2094d74d50a8SDag-Erling Smørgrav packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); 2095d74d50a8SDag-Erling Smørgrav packet_send(); 2096d74d50a8SDag-Erling Smørgrav } else { 2097d4af9e69SDag-Erling Smørgrav channel_request_start(id, "shell", 1); 2098*e146993eSDag-Erling Smørgrav client_expect_confirm(id, "shell", CONFIRM_CLOSE); 2099d74d50a8SDag-Erling Smørgrav packet_send(); 2100d74d50a8SDag-Erling Smørgrav } 2101d74d50a8SDag-Erling Smørgrav } 2102d74d50a8SDag-Erling Smørgrav 2103ae1f160dSDag-Erling Smørgrav static void 21041e8db6e2SBrian Feldman client_init_dispatch_20(void) 2105a04a10f8SKris Kennaway { 2106a04a10f8SKris Kennaway dispatch_init(&dispatch_protocol_error); 2107545d5ecaSDag-Erling Smørgrav 2108a04a10f8SKris Kennaway dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); 2109a04a10f8SKris Kennaway dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); 2110a04a10f8SKris Kennaway dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); 2111a04a10f8SKris Kennaway dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); 2112a04a10f8SKris Kennaway dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); 2113a04a10f8SKris Kennaway dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 2114a04a10f8SKris Kennaway dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 21151e8db6e2SBrian Feldman dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); 2116a04a10f8SKris Kennaway dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); 2117d4af9e69SDag-Erling Smørgrav dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm); 2118d4af9e69SDag-Erling Smørgrav dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm); 2119ae1f160dSDag-Erling Smørgrav dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); 21201e8db6e2SBrian Feldman 21211e8db6e2SBrian Feldman /* rekeying */ 21221e8db6e2SBrian Feldman dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); 2123545d5ecaSDag-Erling Smørgrav 2124545d5ecaSDag-Erling Smørgrav /* global request reply messages */ 2125545d5ecaSDag-Erling Smørgrav dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); 2126545d5ecaSDag-Erling Smørgrav dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); 2127a04a10f8SKris Kennaway } 2128d4af9e69SDag-Erling Smørgrav 2129ae1f160dSDag-Erling Smørgrav static void 21301e8db6e2SBrian Feldman client_init_dispatch_13(void) 2131a04a10f8SKris Kennaway { 2132a04a10f8SKris Kennaway dispatch_init(NULL); 2133a04a10f8SKris Kennaway dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); 2134a04a10f8SKris Kennaway dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); 2135a04a10f8SKris Kennaway dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); 2136a04a10f8SKris Kennaway dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 2137a04a10f8SKris Kennaway dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 2138a04a10f8SKris Kennaway dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); 2139a04a10f8SKris Kennaway dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); 2140a04a10f8SKris Kennaway dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); 2141a04a10f8SKris Kennaway dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); 21424899dde7SBrian Feldman 21434899dde7SBrian Feldman dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? 2144efcad6b7SDag-Erling Smørgrav &client_input_agent_open : &deny_input_open); 21454899dde7SBrian Feldman dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? 21465b9b2fafSBrian Feldman &x11_input_open : &deny_input_open); 2147a04a10f8SKris Kennaway } 2148d4af9e69SDag-Erling Smørgrav 2149ae1f160dSDag-Erling Smørgrav static void 21501e8db6e2SBrian Feldman client_init_dispatch_15(void) 2151a04a10f8SKris Kennaway { 2152a04a10f8SKris Kennaway client_init_dispatch_13(); 2153a04a10f8SKris Kennaway dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); 2154a04a10f8SKris Kennaway dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); 2155a04a10f8SKris Kennaway } 2156d4af9e69SDag-Erling Smørgrav 2157ae1f160dSDag-Erling Smørgrav static void 21581e8db6e2SBrian Feldman client_init_dispatch(void) 2159a04a10f8SKris Kennaway { 2160a04a10f8SKris Kennaway if (compat20) 2161a04a10f8SKris Kennaway client_init_dispatch_20(); 2162a04a10f8SKris Kennaway else if (compat13) 2163a04a10f8SKris Kennaway client_init_dispatch_13(); 2164a04a10f8SKris Kennaway else 2165a04a10f8SKris Kennaway client_init_dispatch_15(); 2166a04a10f8SKris Kennaway } 2167efcad6b7SDag-Erling Smørgrav 2168*e146993eSDag-Erling Smørgrav void 2169*e146993eSDag-Erling Smørgrav client_stop_mux(void) 2170*e146993eSDag-Erling Smørgrav { 2171*e146993eSDag-Erling Smørgrav if (options.control_path != NULL && muxserver_sock != -1) 2172*e146993eSDag-Erling Smørgrav unlink(options.control_path); 2173*e146993eSDag-Erling Smørgrav /* 2174*e146993eSDag-Erling Smørgrav * If we are in persist mode, signal that we should close when all 2175*e146993eSDag-Erling Smørgrav * active channels are closed. 2176*e146993eSDag-Erling Smørgrav */ 2177*e146993eSDag-Erling Smørgrav if (options.control_persist) { 2178*e146993eSDag-Erling Smørgrav session_closed = 1; 2179*e146993eSDag-Erling Smørgrav setproctitle("[stopped mux]"); 2180*e146993eSDag-Erling Smørgrav } 2181*e146993eSDag-Erling Smørgrav } 2182*e146993eSDag-Erling Smørgrav 2183efcad6b7SDag-Erling Smørgrav /* client specific fatal cleanup */ 2184efcad6b7SDag-Erling Smørgrav void 2185efcad6b7SDag-Erling Smørgrav cleanup_exit(int i) 2186efcad6b7SDag-Erling Smørgrav { 2187*e146993eSDag-Erling Smørgrav leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 2188efcad6b7SDag-Erling Smørgrav leave_non_blocking(); 2189d4af9e69SDag-Erling Smørgrav if (options.control_path != NULL && muxserver_sock != -1) 2190d74d50a8SDag-Erling Smørgrav unlink(options.control_path); 21914a421b63SDag-Erling Smørgrav ssh_kill_proxy_command(); 2192efcad6b7SDag-Erling Smørgrav _exit(i); 2193efcad6b7SDag-Erling Smørgrav } 2194