1263970Sdes/* $OpenBSD: clientloop.c,v 1.258 2014/02/02 03:44:31 djm Exp $ */ 2224638Sbrooks/* $FreeBSD$ */ 357429Smarkm/* 457429Smarkm * Author: Tatu Ylonen <ylo@cs.hut.fi> 557429Smarkm * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 657429Smarkm * All rights reserved 765668Skris * The main loop for the interactive session (client side). 860573Skris * 965668Skris * As far as I am concerned, the code I have written for this software 1065668Skris * can be used freely for any purpose. Any derived versions of this 1165668Skris * software must be clearly marked as such, and if the derived work is 1265668Skris * incompatible with the protocol description in the RFC file, it must be 1365668Skris * called by a name other than "ssh" or "Secure Shell". 1460573Skris * 1560573Skris * 1665668Skris * Copyright (c) 1999 Theo de Raadt. All rights reserved. 1760573Skris * 1865668Skris * Redistribution and use in source and binary forms, with or without 1965668Skris * modification, are permitted provided that the following conditions 2065668Skris * are met: 2165668Skris * 1. Redistributions of source code must retain the above copyright 2265668Skris * notice, this list of conditions and the following disclaimer. 2365668Skris * 2. Redistributions in binary form must reproduce the above copyright 2465668Skris * notice, this list of conditions and the following disclaimer in the 2565668Skris * documentation and/or other materials provided with the distribution. 2665668Skris * 2765668Skris * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 2865668Skris * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 2965668Skris * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 3065668Skris * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 3165668Skris * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 3265668Skris * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 3365668Skris * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 3465668Skris * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 3565668Skris * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 3665668Skris * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 3765668Skris * 3865668Skris * 3960573Skris * SSH2 support added by Markus Friedl. 4092555Sdes * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. 4165668Skris * 4265668Skris * Redistribution and use in source and binary forms, with or without 4365668Skris * modification, are permitted provided that the following conditions 4465668Skris * are met: 4565668Skris * 1. Redistributions of source code must retain the above copyright 4665668Skris * notice, this list of conditions and the following disclaimer. 4765668Skris * 2. Redistributions in binary form must reproduce the above copyright 4865668Skris * notice, this list of conditions and the following disclaimer in the 4965668Skris * documentation and/or other materials provided with the distribution. 5065668Skris * 5165668Skris * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 5265668Skris * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 5365668Skris * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 5465668Skris * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 5565668Skris * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 5665668Skris * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 5765668Skris * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 5865668Skris * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 5965668Skris * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 6065668Skris * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 6157429Smarkm */ 6257429Smarkm 6357429Smarkm#include "includes.h" 64263970Sdes__RCSID("$FreeBSD$"); 6557429Smarkm 66162852Sdes#include <sys/types.h> 67162852Sdes#include <sys/ioctl.h> 68162852Sdes#include <sys/param.h> 69162852Sdes#ifdef HAVE_SYS_STAT_H 70162852Sdes# include <sys/stat.h> 71162852Sdes#endif 72162852Sdes#ifdef HAVE_SYS_TIME_H 73162852Sdes# include <sys/time.h> 74162852Sdes#endif 75162852Sdes#include <sys/socket.h> 76162852Sdes 77162852Sdes#include <ctype.h> 78162852Sdes#include <errno.h> 79162852Sdes#ifdef HAVE_PATHS_H 80162852Sdes#include <paths.h> 81162852Sdes#endif 82162852Sdes#include <signal.h> 83162852Sdes#include <stdarg.h> 84162852Sdes#include <stdio.h> 85162852Sdes#include <stdlib.h> 86162852Sdes#include <string.h> 87162852Sdes#include <termios.h> 88162852Sdes#include <pwd.h> 89162852Sdes#include <unistd.h> 90162852Sdes 91181111Sdes#include "openbsd-compat/sys-queue.h" 92162852Sdes#include "xmalloc.h" 9376259Sgreen#include "ssh.h" 9476259Sgreen#include "ssh1.h" 9576259Sgreen#include "ssh2.h" 9657429Smarkm#include "packet.h" 9757429Smarkm#include "buffer.h" 9860573Skris#include "compat.h" 9960573Skris#include "channels.h" 10060573Skris#include "dispatch.h" 10176259Sgreen#include "key.h" 102162852Sdes#include "cipher.h" 10376259Sgreen#include "kex.h" 10476259Sgreen#include "log.h" 10576259Sgreen#include "readconf.h" 10676259Sgreen#include "clientloop.h" 107157016Sdes#include "sshconnect.h" 10876259Sgreen#include "authfd.h" 10976259Sgreen#include "atomicio.h" 110137015Sdes#include "sshpty.h" 11176259Sgreen#include "misc.h" 112137015Sdes#include "match.h" 113137015Sdes#include "msg.h" 114197679Sdes#include "roaming.h" 11560573Skris 11669587Sgreen/* import options */ 11768700Sgreenextern Options options; 11868700Sgreen 11957429Smarkm/* Flag indicating that stdin should be redirected from /dev/null. */ 12057429Smarkmextern int stdin_null_flag; 12157429Smarkm 122126274Sdes/* Flag indicating that no shell has been requested */ 123126274Sdesextern int no_shell_flag; 124126274Sdes 125137015Sdes/* Control socket */ 126204917Sdesextern int muxserver_sock; /* XXX use mux_client_cleanup() instead */ 127137015Sdes 12857429Smarkm/* 12957429Smarkm * Name of the host we are connecting to. This is the name given on the 13057429Smarkm * command line, or the HostName specified for the user-supplied name in a 13157429Smarkm * configuration file. 13257429Smarkm */ 13357429Smarkmextern char *host; 13457429Smarkm 13557429Smarkm/* 13657429Smarkm * Flag to indicate that we have received a window change signal which has 13757429Smarkm * not yet been processed. This will cause a message indicating the new 13857429Smarkm * window size to be sent to the server a little later. This is volatile 13957429Smarkm * because this is updated in a signal handler. 14057429Smarkm */ 14192555Sdesstatic volatile sig_atomic_t received_window_change_signal = 0; 14292555Sdesstatic volatile sig_atomic_t received_signal = 0; 14357429Smarkm 144157016Sdes/* Flag indicating whether the user's terminal is in non-blocking mode. */ 14557429Smarkmstatic int in_non_blocking_mode = 0; 14657429Smarkm 147215116Sdes/* Time when backgrounded control master using ControlPersist should exit */ 148215116Sdesstatic time_t control_persist_exit_time = 0; 149215116Sdes 15057429Smarkm/* Common data for the client loop code. */ 151204917Sdesvolatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */ 152181111Sdesstatic int escape_char1; /* Escape character. (proto1 only) */ 153181111Sdesstatic int escape_pending1; /* Last character was an escape (proto1 only) */ 15457429Smarkmstatic int last_was_cr; /* Last character was a newline. */ 155181111Sdesstatic int exit_status; /* Used to store the command exit status. */ 156181111Sdesstatic int stdin_eof; /* EOF has been encountered on stderr. */ 15757429Smarkmstatic Buffer stdin_buffer; /* Buffer for stdin data. */ 15857429Smarkmstatic Buffer stdout_buffer; /* Buffer for stdout data. */ 15957429Smarkmstatic Buffer stderr_buffer; /* Buffer for stderr data. */ 160215116Sdesstatic u_int buffer_high; /* Soft max buffer size. */ 16157429Smarkmstatic int connection_in; /* Connection to server (input). */ 16257429Smarkmstatic int connection_out; /* Connection to server (output). */ 16376259Sgreenstatic int need_rekeying; /* Set to non-zero if rekeying is requested. */ 164215116Sdesstatic int session_closed; /* In SSH2: login session closed. */ 165215116Sdesstatic int x11_refuse_time; /* If >0, refuse x11 opens after this time. */ 16657429Smarkm 16792555Sdesstatic void client_init_dispatch(void); 16860573Skrisint session_ident = -1; 16960573Skris 170204917Sdesint session_resumed = 0; 171204917Sdes 172181111Sdes/* Track escape per proto2 channel */ 173181111Sdesstruct escape_filter_ctx { 174181111Sdes int escape_pending; 175181111Sdes int escape_char; 176137015Sdes}; 177137015Sdes 178181111Sdes/* Context for channel confirmation replies */ 179181111Sdesstruct channel_reply_ctx { 180181111Sdes const char *request_type; 181247485Sdes int id; 182247485Sdes enum confirm_action action; 183181111Sdes}; 184181111Sdes 185181111Sdes/* Global request success/failure callbacks */ 186181111Sdesstruct global_confirm { 187181111Sdes TAILQ_ENTRY(global_confirm) entry; 188181111Sdes global_confirm_cb *cb; 189181111Sdes void *ctx; 190181111Sdes int ref_count; 191181111Sdes}; 192181111SdesTAILQ_HEAD(global_confirms, global_confirm); 193181111Sdesstatic struct global_confirms global_confirms = 194181111Sdes TAILQ_HEAD_INITIALIZER(global_confirms); 195181111Sdes 19676259Sgreen/*XXX*/ 19776259Sgreenextern Kex *xxx_kex; 19857429Smarkm 199137015Sdesvoid ssh_process_session2_setup(int, int, int, Buffer *); 200137015Sdes 20157429Smarkm/* Restores stdin to blocking mode. */ 20257429Smarkm 20392555Sdesstatic void 20476259Sgreenleave_non_blocking(void) 20557429Smarkm{ 20657429Smarkm if (in_non_blocking_mode) { 207137015Sdes unset_nonblock(fileno(stdin)); 20857429Smarkm in_non_blocking_mode = 0; 20957429Smarkm } 21057429Smarkm} 21157429Smarkm 21257429Smarkm/* Puts stdin terminal in non-blocking mode. */ 21357429Smarkm 21492555Sdesstatic void 21576259Sgreenenter_non_blocking(void) 21657429Smarkm{ 21757429Smarkm in_non_blocking_mode = 1; 218137015Sdes set_nonblock(fileno(stdin)); 21957429Smarkm} 22057429Smarkm 22157429Smarkm/* 22257429Smarkm * Signal handler for the window change signal (SIGWINCH). This just sets a 22357429Smarkm * flag indicating that the window has changed. 22457429Smarkm */ 225162852Sdes/*ARGSUSED */ 22692555Sdesstatic void 22757429Smarkmwindow_change_handler(int sig) 22857429Smarkm{ 22957429Smarkm received_window_change_signal = 1; 23057429Smarkm signal(SIGWINCH, window_change_handler); 23157429Smarkm} 23257429Smarkm 23357429Smarkm/* 23457429Smarkm * Signal handler for signals that cause the program to terminate. These 23557429Smarkm * signals must be trapped to restore terminal modes. 23657429Smarkm */ 237162852Sdes/*ARGSUSED */ 23892555Sdesstatic void 23957429Smarkmsignal_handler(int sig) 24057429Smarkm{ 24192555Sdes received_signal = sig; 24292555Sdes quit_pending = 1; 24357429Smarkm} 24457429Smarkm 24557429Smarkm/* 24657429Smarkm * Returns current time in seconds from Jan 1, 1970 with the maximum 24757429Smarkm * available resolution. 24857429Smarkm */ 24957429Smarkm 25092555Sdesstatic double 25176259Sgreenget_current_time(void) 25257429Smarkm{ 25357429Smarkm struct timeval tv; 25457429Smarkm gettimeofday(&tv, NULL); 25557429Smarkm return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; 25657429Smarkm} 25757429Smarkm 258215116Sdes/* 259215116Sdes * Sets control_persist_exit_time to the absolute time when the 260215116Sdes * backgrounded control master should exit due to expiry of the 261215116Sdes * ControlPersist timeout. Sets it to 0 if we are not a backgrounded 262215116Sdes * control master process, or if there is no ControlPersist timeout. 263215116Sdes */ 264215116Sdesstatic void 265215116Sdesset_control_persist_exit_time(void) 266215116Sdes{ 267215116Sdes if (muxserver_sock == -1 || !options.control_persist 268247485Sdes || options.control_persist_timeout == 0) { 269215116Sdes /* not using a ControlPersist timeout */ 270215116Sdes control_persist_exit_time = 0; 271247485Sdes } else if (channel_still_open()) { 272215116Sdes /* some client connections are still open */ 273215116Sdes if (control_persist_exit_time > 0) 274215116Sdes debug2("%s: cancel scheduled exit", __func__); 275215116Sdes control_persist_exit_time = 0; 276215116Sdes } else if (control_persist_exit_time <= 0) { 277215116Sdes /* a client connection has recently closed */ 278263970Sdes control_persist_exit_time = monotime() + 279215116Sdes (time_t)options.control_persist_timeout; 280215116Sdes debug2("%s: schedule exit in %d seconds", __func__, 281215116Sdes options.control_persist_timeout); 282215116Sdes } 283215116Sdes /* else we are already counting down to the timeout */ 284215116Sdes} 285215116Sdes 286247485Sdes#define SSH_X11_VALID_DISPLAY_CHARS ":/.-_" 287247485Sdesstatic int 288247485Sdesclient_x11_display_valid(const char *display) 289247485Sdes{ 290247485Sdes size_t i, dlen; 291247485Sdes 292247485Sdes dlen = strlen(display); 293247485Sdes for (i = 0; i < dlen; i++) { 294263970Sdes if (!isalnum((u_char)display[i]) && 295247485Sdes strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) { 296247485Sdes debug("Invalid character '%c' in DISPLAY", display[i]); 297247485Sdes return 0; 298247485Sdes } 299247485Sdes } 300247485Sdes return 1; 301247485Sdes} 302247485Sdes 303149749Sdes#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" 304149749Sdesvoid 305149749Sdesclient_x11_get_proto(const char *display, const char *xauth_path, 306215116Sdes u_int trusted, u_int timeout, char **_proto, char **_data) 307149749Sdes{ 308149749Sdes char cmd[1024]; 309149749Sdes char line[512]; 310149749Sdes char xdisplay[512]; 311149749Sdes static char proto[512], data[512]; 312149749Sdes FILE *f; 313149749Sdes int got_data = 0, generated = 0, do_unlink = 0, i; 314149749Sdes char *xauthdir, *xauthfile; 315149749Sdes struct stat st; 316215116Sdes u_int now; 317149749Sdes 318149749Sdes xauthdir = xauthfile = NULL; 319149749Sdes *_proto = proto; 320149749Sdes *_data = data; 321149749Sdes proto[0] = data[0] = '\0'; 322149749Sdes 323149749Sdes if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { 324149749Sdes debug("No xauth program."); 325247485Sdes } else if (!client_x11_display_valid(display)) { 326247485Sdes logit("DISPLAY '%s' invalid, falling back to fake xauth data", 327247485Sdes display); 328149749Sdes } else { 329149749Sdes if (display == NULL) { 330149749Sdes debug("x11_get_proto: DISPLAY not set"); 331149749Sdes return; 332149749Sdes } 333149749Sdes /* 334149749Sdes * Handle FamilyLocal case where $DISPLAY does 335149749Sdes * not match an authorization entry. For this we 336149749Sdes * just try "xauth list unix:displaynum.screennum". 337149749Sdes * XXX: "localhost" match to determine FamilyLocal 338149749Sdes * is not perfect. 339149749Sdes */ 340149749Sdes if (strncmp(display, "localhost:", 10) == 0) { 341149749Sdes snprintf(xdisplay, sizeof(xdisplay), "unix:%s", 342149749Sdes display + 10); 343149749Sdes display = xdisplay; 344149749Sdes } 345149749Sdes if (trusted == 0) { 346149749Sdes xauthdir = xmalloc(MAXPATHLEN); 347149749Sdes xauthfile = xmalloc(MAXPATHLEN); 348221420Sdes mktemp_proto(xauthdir, MAXPATHLEN); 349149749Sdes if (mkdtemp(xauthdir) != NULL) { 350149749Sdes do_unlink = 1; 351149749Sdes snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", 352149749Sdes xauthdir); 353149749Sdes snprintf(cmd, sizeof(cmd), 354149749Sdes "%s -f %s generate %s " SSH_X11_PROTO 355215116Sdes " untrusted timeout %u 2>" _PATH_DEVNULL, 356215116Sdes xauth_path, xauthfile, display, timeout); 357149749Sdes debug2("x11_get_proto: %s", cmd); 358149749Sdes if (system(cmd) == 0) 359149749Sdes generated = 1; 360215116Sdes if (x11_refuse_time == 0) { 361263970Sdes now = monotime() + 1; 362215116Sdes if (UINT_MAX - timeout < now) 363215116Sdes x11_refuse_time = UINT_MAX; 364215116Sdes else 365215116Sdes x11_refuse_time = now + timeout; 366215116Sdes } 367149749Sdes } 368149749Sdes } 369181111Sdes 370181111Sdes /* 371181111Sdes * When in untrusted mode, we read the cookie only if it was 372181111Sdes * successfully generated as an untrusted one in the step 373181111Sdes * above. 374181111Sdes */ 375181111Sdes if (trusted || generated) { 376181111Sdes snprintf(cmd, sizeof(cmd), 377181111Sdes "%s %s%s list %s 2>" _PATH_DEVNULL, 378181111Sdes xauth_path, 379181111Sdes generated ? "-f " : "" , 380181111Sdes generated ? xauthfile : "", 381181111Sdes display); 382181111Sdes debug2("x11_get_proto: %s", cmd); 383181111Sdes f = popen(cmd, "r"); 384181111Sdes if (f && fgets(line, sizeof(line), f) && 385181111Sdes sscanf(line, "%*s %511s %511s", proto, data) == 2) 386181111Sdes got_data = 1; 387181111Sdes if (f) 388181111Sdes pclose(f); 389181111Sdes } else 390181111Sdes error("Warning: untrusted X11 forwarding setup failed: " 391181111Sdes "xauth key data not generated"); 392149749Sdes } 393149749Sdes 394149749Sdes if (do_unlink) { 395149749Sdes unlink(xauthfile); 396149749Sdes rmdir(xauthdir); 397149749Sdes } 398263970Sdes free(xauthdir); 399263970Sdes free(xauthfile); 400149749Sdes 401149749Sdes /* 402149749Sdes * If we didn't get authentication data, just make up some 403149749Sdes * data. The forwarding code will check the validity of the 404149749Sdes * response anyway, and substitute this data. The X11 405149749Sdes * server, however, will ignore this fake data and use 406149749Sdes * whatever authentication mechanisms it was using otherwise 407149749Sdes * for the local connection. 408149749Sdes */ 409149749Sdes if (!got_data) { 410149749Sdes u_int32_t rnd = 0; 411149749Sdes 412149749Sdes logit("Warning: No xauth data; " 413149749Sdes "using fake authentication data for X11 forwarding."); 414149749Sdes strlcpy(proto, SSH_X11_PROTO, sizeof proto); 415149749Sdes for (i = 0; i < 16; i++) { 416149749Sdes if (i % 4 == 0) 417149749Sdes rnd = arc4random(); 418149749Sdes snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", 419149749Sdes rnd & 0xff); 420149749Sdes rnd >>= 8; 421149749Sdes } 422149749Sdes } 423149749Sdes} 424149749Sdes 42557429Smarkm/* 42657429Smarkm * This is called when the interactive is entered. This checks if there is 42757429Smarkm * an EOF coming on stdin. We must check this explicitly, as select() does 42857429Smarkm * not appear to wake up when redirecting from /dev/null. 42957429Smarkm */ 43057429Smarkm 43192555Sdesstatic void 43276259Sgreenclient_check_initial_eof_on_stdin(void) 43357429Smarkm{ 43457429Smarkm int len; 43557429Smarkm char buf[1]; 43657429Smarkm 43757429Smarkm /* 43857429Smarkm * If standard input is to be "redirected from /dev/null", we simply 43957429Smarkm * mark that we have seen an EOF and send an EOF message to the 44057429Smarkm * server. Otherwise, we try to read a single character; it appears 44157429Smarkm * that for some files, such /dev/null, select() never wakes up for 44257429Smarkm * read for this descriptor, which means that we never get EOF. This 44357429Smarkm * way we will get the EOF if stdin comes from /dev/null or similar. 44457429Smarkm */ 44557429Smarkm if (stdin_null_flag) { 44657429Smarkm /* Fake EOF on stdin. */ 44757429Smarkm debug("Sending eof."); 44857429Smarkm stdin_eof = 1; 44957429Smarkm packet_start(SSH_CMSG_EOF); 45057429Smarkm packet_send(); 45157429Smarkm } else { 45257429Smarkm enter_non_blocking(); 45357429Smarkm 45457429Smarkm /* Check for immediate EOF on stdin. */ 45557429Smarkm len = read(fileno(stdin), buf, 1); 45657429Smarkm if (len == 0) { 457181111Sdes /* 458181111Sdes * EOF. Record that we have seen it and send 459181111Sdes * EOF to server. 460181111Sdes */ 46157429Smarkm debug("Sending eof."); 46257429Smarkm stdin_eof = 1; 46357429Smarkm packet_start(SSH_CMSG_EOF); 46457429Smarkm packet_send(); 46557429Smarkm } else if (len > 0) { 46657429Smarkm /* 46757429Smarkm * Got data. We must store the data in the buffer, 46857429Smarkm * and also process it as an escape character if 46957429Smarkm * appropriate. 47057429Smarkm */ 471181111Sdes if ((u_char) buf[0] == escape_char1) 472181111Sdes escape_pending1 = 1; 47376259Sgreen else 47457429Smarkm buffer_append(&stdin_buffer, buf, 1); 47557429Smarkm } 47657429Smarkm leave_non_blocking(); 47757429Smarkm } 47857429Smarkm} 47957429Smarkm 48057429Smarkm 48157429Smarkm/* 48257429Smarkm * Make packets from buffered stdin data, and buffer them for sending to the 48357429Smarkm * connection. 48457429Smarkm */ 48557429Smarkm 48692555Sdesstatic void 48776259Sgreenclient_make_packets_from_stdin_data(void) 48857429Smarkm{ 48976259Sgreen u_int len; 49057429Smarkm 49157429Smarkm /* Send buffered stdin data to the server. */ 49257429Smarkm while (buffer_len(&stdin_buffer) > 0 && 49392555Sdes packet_not_very_much_data_to_write()) { 49457429Smarkm len = buffer_len(&stdin_buffer); 49557429Smarkm /* Keep the packets at reasonable size. */ 49657429Smarkm if (len > packet_get_maxsize()) 49757429Smarkm len = packet_get_maxsize(); 49857429Smarkm packet_start(SSH_CMSG_STDIN_DATA); 49957429Smarkm packet_put_string(buffer_ptr(&stdin_buffer), len); 50057429Smarkm packet_send(); 50157429Smarkm buffer_consume(&stdin_buffer, len); 50257429Smarkm /* If we have a pending EOF, send it now. */ 50357429Smarkm if (stdin_eof && buffer_len(&stdin_buffer) == 0) { 50457429Smarkm packet_start(SSH_CMSG_EOF); 50557429Smarkm packet_send(); 50657429Smarkm } 50757429Smarkm } 50857429Smarkm} 50957429Smarkm 51057429Smarkm/* 51157429Smarkm * Checks if the client window has changed, and sends a packet about it to 51257429Smarkm * the server if so. The actual change is detected elsewhere (by a software 51357429Smarkm * interrupt on Unix); this just checks the flag and sends a message if 51457429Smarkm * appropriate. 51557429Smarkm */ 51657429Smarkm 51792555Sdesstatic void 51876259Sgreenclient_check_window_change(void) 51957429Smarkm{ 52060573Skris struct winsize ws; 52157429Smarkm 52260573Skris if (! received_window_change_signal) 52360573Skris return; 52460573Skris /** XXX race */ 52560573Skris received_window_change_signal = 0; 52657429Smarkm 52769587Sgreen debug2("client_check_window_change: changed"); 52860573Skris 52960573Skris if (compat20) { 530137015Sdes channel_send_window_changes(); 53160573Skris } else { 532137015Sdes if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) 533137015Sdes return; 53460573Skris packet_start(SSH_CMSG_WINDOW_SIZE); 535162852Sdes packet_put_int((u_int)ws.ws_row); 536162852Sdes packet_put_int((u_int)ws.ws_col); 537162852Sdes packet_put_int((u_int)ws.ws_xpixel); 538162852Sdes packet_put_int((u_int)ws.ws_ypixel); 53960573Skris packet_send(); 54057429Smarkm } 54157429Smarkm} 54257429Smarkm 543126274Sdesstatic void 544126274Sdesclient_global_request_reply(int type, u_int32_t seq, void *ctxt) 545126274Sdes{ 546181111Sdes struct global_confirm *gc; 547181111Sdes 548181111Sdes if ((gc = TAILQ_FIRST(&global_confirms)) == NULL) 549181111Sdes return; 550181111Sdes if (gc->cb != NULL) 551181111Sdes gc->cb(type, seq, gc->ctx); 552181111Sdes if (--gc->ref_count <= 0) { 553181111Sdes TAILQ_REMOVE(&global_confirms, gc, entry); 554263970Sdes explicit_bzero(gc, sizeof(*gc)); 555263970Sdes free(gc); 556181111Sdes } 557181111Sdes 558197679Sdes packet_set_alive_timeouts(0); 559126274Sdes} 560126274Sdes 561126274Sdesstatic void 562126274Sdesserver_alive_check(void) 563126274Sdes{ 564197679Sdes if (packet_inc_alive_timeouts() > options.server_alive_count_max) { 565221420Sdes logit("Timeout, server %s not responding.", host); 566164146Sdes cleanup_exit(255); 567164146Sdes } 568126274Sdes packet_start(SSH2_MSG_GLOBAL_REQUEST); 569126274Sdes packet_put_cstring("keepalive@openssh.com"); 570126274Sdes packet_put_char(1); /* boolean: want reply */ 571126274Sdes packet_send(); 572181111Sdes /* Insert an empty placeholder to maintain ordering */ 573181111Sdes client_register_global_confirm(NULL, NULL); 574126274Sdes} 575126274Sdes 57657429Smarkm/* 57757429Smarkm * Waits until the client can do something (some data becomes available on 57857429Smarkm * one of the file descriptors). 57957429Smarkm */ 58092555Sdesstatic void 58176259Sgreenclient_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, 582137015Sdes int *maxfdp, u_int *nallocp, int rekeying) 58357429Smarkm{ 584126274Sdes struct timeval tv, *tvp; 585215116Sdes int timeout_secs; 586263970Sdes time_t minwait_secs = 0, server_alive_time = 0, now = monotime(); 587126274Sdes int ret; 588126274Sdes 58976259Sgreen /* Add any selections by the channel mechanism. */ 590247485Sdes channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 591247485Sdes &minwait_secs, rekeying); 59257429Smarkm 59360573Skris if (!compat20) { 59460573Skris /* Read from the connection, unless our buffers are full. */ 59560573Skris if (buffer_len(&stdout_buffer) < buffer_high && 59660573Skris buffer_len(&stderr_buffer) < buffer_high && 59760573Skris channel_not_very_much_buffered_data()) 59876259Sgreen FD_SET(connection_in, *readsetp); 59960573Skris /* 60060573Skris * Read from stdin, unless we have seen EOF or have very much 60160573Skris * buffered data to send to the server. 60260573Skris */ 60360573Skris if (!stdin_eof && packet_not_very_much_data_to_write()) 60476259Sgreen FD_SET(fileno(stdin), *readsetp); 60560573Skris 60660573Skris /* Select stdout/stderr if have data in buffer. */ 60760573Skris if (buffer_len(&stdout_buffer) > 0) 60876259Sgreen FD_SET(fileno(stdout), *writesetp); 60960573Skris if (buffer_len(&stderr_buffer) > 0) 61076259Sgreen FD_SET(fileno(stderr), *writesetp); 61160573Skris } else { 61292555Sdes /* channel_prepare_select could have closed the last channel */ 61392555Sdes if (session_closed && !channel_still_open() && 61492555Sdes !packet_have_data_to_write()) { 61592555Sdes /* clear mask since we did not call select() */ 61692555Sdes memset(*readsetp, 0, *nallocp); 61792555Sdes memset(*writesetp, 0, *nallocp); 61892555Sdes return; 61992555Sdes } else { 62092555Sdes FD_SET(connection_in, *readsetp); 62192555Sdes } 62260573Skris } 62357429Smarkm 62457429Smarkm /* Select server connection if have data to write to the server. */ 62557429Smarkm if (packet_have_data_to_write()) 62676259Sgreen FD_SET(connection_out, *writesetp); 62757429Smarkm 62857429Smarkm /* 62957429Smarkm * Wait for something to happen. This will suspend the process until 63057429Smarkm * some selected descriptor can be read, written, or has some other 631215116Sdes * event pending, or a timeout expires. 63257429Smarkm */ 63357429Smarkm 634215116Sdes timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */ 635263970Sdes if (options.server_alive_interval > 0 && compat20) { 636215116Sdes timeout_secs = options.server_alive_interval; 637263970Sdes server_alive_time = now + options.server_alive_interval; 638263970Sdes } 639263970Sdes if (options.rekey_interval > 0 && compat20 && !rekeying) 640263970Sdes timeout_secs = MIN(timeout_secs, packet_get_rekey_timeout()); 641215116Sdes set_control_persist_exit_time(); 642215116Sdes if (control_persist_exit_time > 0) { 643215116Sdes timeout_secs = MIN(timeout_secs, 644263970Sdes control_persist_exit_time - now); 645215116Sdes if (timeout_secs < 0) 646215116Sdes timeout_secs = 0; 647215116Sdes } 648247485Sdes if (minwait_secs != 0) 649247485Sdes timeout_secs = MIN(timeout_secs, (int)minwait_secs); 650215116Sdes if (timeout_secs == INT_MAX) 651126274Sdes tvp = NULL; 652137015Sdes else { 653215116Sdes tv.tv_sec = timeout_secs; 654126274Sdes tv.tv_usec = 0; 655126274Sdes tvp = &tv; 656126274Sdes } 657215116Sdes 658126274Sdes ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); 659126274Sdes if (ret < 0) { 66057429Smarkm char buf[100]; 66176259Sgreen 66276259Sgreen /* 66376259Sgreen * We have to clear the select masks, because we return. 66476259Sgreen * We have to return, because the mainloop checks for the flags 66576259Sgreen * set by the signal handlers. 66676259Sgreen */ 66792555Sdes memset(*readsetp, 0, *nallocp); 66892555Sdes memset(*writesetp, 0, *nallocp); 66976259Sgreen 67057429Smarkm if (errno == EINTR) 67157429Smarkm return; 67257429Smarkm /* Note: we might still have data in the buffers. */ 67357429Smarkm snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); 67457429Smarkm buffer_append(&stderr_buffer, buf, strlen(buf)); 67557429Smarkm quit_pending = 1; 676263970Sdes } else if (ret == 0) { 677263970Sdes /* 678263970Sdes * Timeout. Could have been either keepalive or rekeying. 679263970Sdes * Keepalive we check here, rekeying is checked in clientloop. 680263970Sdes */ 681263970Sdes if (server_alive_time != 0 && server_alive_time <= monotime()) 682263970Sdes server_alive_check(); 683263970Sdes } 684263970Sdes 68557429Smarkm} 68657429Smarkm 68792555Sdesstatic void 68865668Skrisclient_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) 68957429Smarkm{ 69057429Smarkm /* Flush stdout and stderr buffers. */ 69165668Skris if (buffer_len(bout) > 0) 692181111Sdes atomicio(vwrite, fileno(stdout), buffer_ptr(bout), 693181111Sdes buffer_len(bout)); 69465668Skris if (buffer_len(berr) > 0) 695181111Sdes atomicio(vwrite, fileno(stderr), buffer_ptr(berr), 696181111Sdes buffer_len(berr)); 69757429Smarkm 698247485Sdes leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 69957429Smarkm 70057429Smarkm /* 70157429Smarkm * Free (and clear) the buffer to reduce the amount of data that gets 70257429Smarkm * written to swap. 70357429Smarkm */ 70465668Skris buffer_free(bin); 70565668Skris buffer_free(bout); 70665668Skris buffer_free(berr); 70757429Smarkm 70857429Smarkm /* Send the suspend signal to the program itself. */ 70957429Smarkm kill(getpid(), SIGTSTP); 71057429Smarkm 711146998Sdes /* Reset window sizes in case they have changed */ 712146998Sdes received_window_change_signal = 1; 71357429Smarkm 71457429Smarkm /* OK, we have been continued by the user. Reinitialize buffers. */ 71565668Skris buffer_init(bin); 71665668Skris buffer_init(bout); 71765668Skris buffer_init(berr); 71857429Smarkm 719247485Sdes enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 72057429Smarkm} 72157429Smarkm 72292555Sdesstatic void 723162852Sdesclient_process_net_input(fd_set *readset) 72457429Smarkm{ 725197679Sdes int len, cont = 0; 726197679Sdes char buf[SSH_IOBUFSZ]; 72757429Smarkm 72857429Smarkm /* 72957429Smarkm * Read input from the server, and add any such data to the buffer of 73057429Smarkm * the packet subsystem. 73157429Smarkm */ 73257429Smarkm if (FD_ISSET(connection_in, readset)) { 73357429Smarkm /* Read as much as possible. */ 734197679Sdes len = roaming_read(connection_in, buf, sizeof(buf), &cont); 735197679Sdes if (len == 0 && cont == 0) { 736181111Sdes /* 737181111Sdes * Received EOF. The remote host has closed the 738181111Sdes * connection. 739181111Sdes */ 740181111Sdes snprintf(buf, sizeof buf, 741181111Sdes "Connection to %.300s closed by remote host.\r\n", 742181111Sdes host); 74357429Smarkm buffer_append(&stderr_buffer, buf, strlen(buf)); 74457429Smarkm quit_pending = 1; 74557429Smarkm return; 74657429Smarkm } 74757429Smarkm /* 74857429Smarkm * There is a kernel bug on Solaris that causes select to 74957429Smarkm * sometimes wake up even though there is no data available. 75057429Smarkm */ 751181111Sdes if (len < 0 && 752181111Sdes (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) 75357429Smarkm len = 0; 75457429Smarkm 75557429Smarkm if (len < 0) { 756181111Sdes /* 757181111Sdes * An error has encountered. Perhaps there is a 758181111Sdes * network problem. 759181111Sdes */ 760181111Sdes snprintf(buf, sizeof buf, 761181111Sdes "Read from remote host %.300s: %.100s\r\n", 762181111Sdes host, strerror(errno)); 76357429Smarkm buffer_append(&stderr_buffer, buf, strlen(buf)); 76457429Smarkm quit_pending = 1; 76557429Smarkm return; 76657429Smarkm } 76757429Smarkm packet_process_incoming(buf, len); 76857429Smarkm } 76960573Skris} 77060573Skris 77198675Sdesstatic void 772181111Sdesclient_status_confirm(int type, Channel *c, void *ctx) 773137015Sdes{ 774181111Sdes struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx; 775181111Sdes char errmsg[256]; 776181111Sdes int tochan; 777137015Sdes 778247485Sdes /* 779247485Sdes * If a TTY was explicitly requested, then a failure to allocate 780247485Sdes * one is fatal. 781247485Sdes */ 782247485Sdes if (cr->action == CONFIRM_TTY && 783247485Sdes (options.request_tty == REQUEST_TTY_FORCE || 784247485Sdes options.request_tty == REQUEST_TTY_YES)) 785247485Sdes cr->action = CONFIRM_CLOSE; 786247485Sdes 787181111Sdes /* XXX supress on mux _client_ quietmode */ 788181111Sdes tochan = options.log_level >= SYSLOG_LEVEL_ERROR && 789204917Sdes c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE; 790137015Sdes 791181111Sdes if (type == SSH2_MSG_CHANNEL_SUCCESS) { 792181111Sdes debug2("%s request accepted on channel %d", 793181111Sdes cr->request_type, c->self); 794181111Sdes } else if (type == SSH2_MSG_CHANNEL_FAILURE) { 795181111Sdes if (tochan) { 796181111Sdes snprintf(errmsg, sizeof(errmsg), 797181111Sdes "%s request failed\r\n", cr->request_type); 798181111Sdes } else { 799181111Sdes snprintf(errmsg, sizeof(errmsg), 800181111Sdes "%s request failed on channel %d", 801181111Sdes cr->request_type, c->self); 802181111Sdes } 803181111Sdes /* If error occurred on primary session channel, then exit */ 804247485Sdes if (cr->action == CONFIRM_CLOSE && c->self == session_ident) 805181111Sdes fatal("%s", errmsg); 806247485Sdes /* 807247485Sdes * If error occurred on mux client, append to 808247485Sdes * their stderr. 809247485Sdes */ 810247485Sdes if (tochan) { 811247485Sdes buffer_append(&c->extended, errmsg, 812247485Sdes strlen(errmsg)); 813247485Sdes } else 814181111Sdes error("%s", errmsg); 815247485Sdes if (cr->action == CONFIRM_TTY) { 816247485Sdes /* 817247485Sdes * If a TTY allocation error occurred, then arrange 818247485Sdes * for the correct TTY to leave raw mode. 819247485Sdes */ 820247485Sdes if (c->self == session_ident) 821247485Sdes leave_raw_mode(0); 822247485Sdes else 823247485Sdes mux_tty_alloc_failed(c); 824247485Sdes } else if (cr->action == CONFIRM_CLOSE) { 825181111Sdes chan_read_failed(c); 826181111Sdes chan_write_failed(c); 827181111Sdes } 828137015Sdes } 829263970Sdes free(cr); 830137015Sdes} 831137015Sdes 832137015Sdesstatic void 833181111Sdesclient_abandon_status_confirm(Channel *c, void *ctx) 834137015Sdes{ 835263970Sdes free(ctx); 836137015Sdes} 837137015Sdes 838247485Sdesvoid 839247485Sdesclient_expect_confirm(int id, const char *request, 840247485Sdes enum confirm_action action) 841137015Sdes{ 842263970Sdes struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr)); 843137015Sdes 844181111Sdes cr->request_type = request; 845247485Sdes cr->action = action; 846137015Sdes 847181111Sdes channel_register_status_confirm(id, client_status_confirm, 848181111Sdes client_abandon_status_confirm, cr); 849181111Sdes} 850137015Sdes 851181111Sdesvoid 852181111Sdesclient_register_global_confirm(global_confirm_cb *cb, void *ctx) 853181111Sdes{ 854181111Sdes struct global_confirm *gc, *last_gc; 855137015Sdes 856181111Sdes /* Coalesce identical callbacks */ 857181111Sdes last_gc = TAILQ_LAST(&global_confirms, global_confirms); 858181111Sdes if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) { 859181111Sdes if (++last_gc->ref_count >= INT_MAX) 860181111Sdes fatal("%s: last_gc->ref_count = %d", 861181111Sdes __func__, last_gc->ref_count); 862146998Sdes return; 863146998Sdes } 864146998Sdes 865263970Sdes gc = xcalloc(1, sizeof(*gc)); 866181111Sdes gc->cb = cb; 867181111Sdes gc->ctx = ctx; 868181111Sdes gc->ref_count = 1; 869181111Sdes TAILQ_INSERT_TAIL(&global_confirms, gc, entry); 870137015Sdes} 871137015Sdes 872137015Sdesstatic void 87398675Sdesprocess_cmdline(void) 87498675Sdes{ 87598675Sdes void (*handler)(int); 876146998Sdes char *s, *cmd, *cancel_host; 877247485Sdes int delete = 0, local = 0, remote = 0, dynamic = 0; 878247485Sdes int cancel_port, ok; 879146998Sdes Forward fwd; 88098675Sdes 881263970Sdes memset(&fwd, 0, sizeof(fwd)); 882181111Sdes fwd.listen_host = fwd.connect_host = NULL; 883181111Sdes 884247485Sdes leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 88598675Sdes handler = signal(SIGINT, SIG_IGN); 88698675Sdes cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); 88798675Sdes if (s == NULL) 88898675Sdes goto out; 889263970Sdes while (isspace((u_char)*s)) 89098675Sdes s++; 891137015Sdes if (*s == '-') 892137015Sdes s++; /* Skip cmdline '-', if any */ 893137015Sdes if (*s == '\0') 89498675Sdes goto out; 895137015Sdes 896137015Sdes if (*s == 'h' || *s == 'H' || *s == '?') { 897137015Sdes logit("Commands:"); 898162852Sdes logit(" -L[bind_address:]port:host:hostport " 899162852Sdes "Request local forward"); 900162852Sdes logit(" -R[bind_address:]port:host:hostport " 901162852Sdes "Request remote forward"); 902192595Sdes logit(" -D[bind_address:]port " 903192595Sdes "Request dynamic forward"); 904247485Sdes logit(" -KL[bind_address:]port " 905247485Sdes "Cancel local forward"); 906162852Sdes logit(" -KR[bind_address:]port " 907162852Sdes "Cancel remote forward"); 908247485Sdes logit(" -KD[bind_address:]port " 909247485Sdes "Cancel dynamic forward"); 910157016Sdes if (!options.permit_local_command) 911157016Sdes goto out; 912162852Sdes logit(" !args " 913162852Sdes "Execute local command"); 914137015Sdes goto out; 915137015Sdes } 916137015Sdes 917157016Sdes if (*s == '!' && options.permit_local_command) { 918157016Sdes s++; 919157016Sdes ssh_local_cmd(s); 920157016Sdes goto out; 921157016Sdes } 922157016Sdes 923137015Sdes if (*s == 'K') { 924137015Sdes delete = 1; 925137015Sdes s++; 926137015Sdes } 927192595Sdes if (*s == 'L') 928192595Sdes local = 1; 929192595Sdes else if (*s == 'R') 930192595Sdes remote = 1; 931192595Sdes else if (*s == 'D') 932192595Sdes dynamic = 1; 933192595Sdes else { 934124208Sdes logit("Invalid command."); 93598675Sdes goto out; 93698675Sdes } 937192595Sdes 938247485Sdes if (delete && !compat20) { 939124208Sdes logit("Not supported for SSH protocol version 1."); 94098675Sdes goto out; 94198675Sdes } 942137015Sdes 943263970Sdes while (isspace((u_char)*++s)) 944181111Sdes ; 94598675Sdes 946204917Sdes /* XXX update list of forwards in options */ 947137015Sdes if (delete) { 948146998Sdes cancel_port = 0; 949146998Sdes cancel_host = hpdelim(&s); /* may be NULL */ 950146998Sdes if (s != NULL) { 951146998Sdes cancel_port = a2port(s); 952146998Sdes cancel_host = cleanhostname(cancel_host); 953146998Sdes } else { 954146998Sdes cancel_port = a2port(cancel_host); 955146998Sdes cancel_host = NULL; 95698675Sdes } 957192595Sdes if (cancel_port <= 0) { 958146998Sdes logit("Bad forwarding close port"); 959137015Sdes goto out; 960137015Sdes } 961247485Sdes if (remote) 962247485Sdes ok = channel_request_rforward_cancel(cancel_host, 963247485Sdes cancel_port) == 0; 964247485Sdes else if (dynamic) 965247485Sdes ok = channel_cancel_lport_listener(cancel_host, 966247485Sdes cancel_port, 0, options.gateway_ports) > 0; 967247485Sdes else 968247485Sdes ok = channel_cancel_lport_listener(cancel_host, 969247485Sdes cancel_port, CHANNEL_CANCEL_PORT_STATIC, 970247485Sdes options.gateway_ports) > 0; 971247485Sdes if (!ok) { 972247485Sdes logit("Unkown port forwarding."); 973247485Sdes goto out; 974247485Sdes } 975247485Sdes logit("Canceled forwarding."); 976137015Sdes } else { 977192595Sdes if (!parse_forward(&fwd, s, dynamic, remote)) { 978137015Sdes logit("Bad forwarding specification."); 979137015Sdes goto out; 980137015Sdes } 981192595Sdes if (local || dynamic) { 982251135Sdes if (!channel_setup_local_fwd_listener(fwd.listen_host, 983146998Sdes fwd.listen_port, fwd.connect_host, 984251135Sdes fwd.connect_port, options.gateway_ports)) { 985137015Sdes logit("Port forwarding failed."); 986137015Sdes goto out; 987137015Sdes } 988146998Sdes } else { 989162852Sdes if (channel_request_remote_forwarding(fwd.listen_host, 990146998Sdes fwd.listen_port, fwd.connect_host, 991162852Sdes fwd.connect_port) < 0) { 992162852Sdes logit("Port forwarding failed."); 993162852Sdes goto out; 994162852Sdes } 995146998Sdes } 996137015Sdes logit("Forwarding port."); 997137015Sdes } 998137015Sdes 99998675Sdesout: 100098675Sdes signal(SIGINT, handler); 1001247485Sdes enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 1002263970Sdes free(cmd); 1003263970Sdes free(fwd.listen_host); 1004263970Sdes free(fwd.connect_host); 100598675Sdes} 100698675Sdes 1007251135Sdes/* reasons to suppress output of an escape command in help output */ 1008251135Sdes#define SUPPRESS_NEVER 0 /* never suppress, always show */ 1009251135Sdes#define SUPPRESS_PROTO1 1 /* don't show in protocol 1 sessions */ 1010251135Sdes#define SUPPRESS_MUXCLIENT 2 /* don't show in mux client sessions */ 1011251135Sdes#define SUPPRESS_MUXMASTER 4 /* don't show in mux master sessions */ 1012251135Sdes#define SUPPRESS_SYSLOG 8 /* don't show when logging to syslog */ 1013251135Sdesstruct escape_help_text { 1014251135Sdes const char *cmd; 1015251135Sdes const char *text; 1016251135Sdes unsigned int flags; 1017251135Sdes}; 1018251135Sdesstatic struct escape_help_text esc_txt[] = { 1019251135Sdes {".", "terminate session", SUPPRESS_MUXMASTER}, 1020251135Sdes {".", "terminate connection (and any multiplexed sessions)", 1021251135Sdes SUPPRESS_MUXCLIENT}, 1022251135Sdes {"B", "send a BREAK to the remote system", SUPPRESS_PROTO1}, 1023251135Sdes {"C", "open a command line", SUPPRESS_MUXCLIENT}, 1024251135Sdes {"R", "request rekey", SUPPRESS_PROTO1}, 1025251135Sdes {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT}, 1026251135Sdes {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT}, 1027251135Sdes {"#", "list forwarded connections", SUPPRESS_NEVER}, 1028251135Sdes {"&", "background ssh (when waiting for connections to terminate)", 1029251135Sdes SUPPRESS_MUXCLIENT}, 1030251135Sdes {"?", "this message", SUPPRESS_NEVER}, 1031251135Sdes}; 1032251135Sdes 1033251135Sdesstatic void 1034251135Sdesprint_escape_help(Buffer *b, int escape_char, int protocol2, int mux_client, 1035251135Sdes int using_stderr) 1036251135Sdes{ 1037251135Sdes unsigned int i, suppress_flags; 1038251135Sdes char string[1024]; 1039251135Sdes 1040251135Sdes snprintf(string, sizeof string, "%c?\r\n" 1041251135Sdes "Supported escape sequences:\r\n", escape_char); 1042251135Sdes buffer_append(b, string, strlen(string)); 1043251135Sdes 1044251135Sdes suppress_flags = (protocol2 ? 0 : SUPPRESS_PROTO1) | 1045251135Sdes (mux_client ? SUPPRESS_MUXCLIENT : 0) | 1046251135Sdes (mux_client ? 0 : SUPPRESS_MUXMASTER) | 1047251135Sdes (using_stderr ? 0 : SUPPRESS_SYSLOG); 1048251135Sdes 1049251135Sdes for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) { 1050251135Sdes if (esc_txt[i].flags & suppress_flags) 1051251135Sdes continue; 1052251135Sdes snprintf(string, sizeof string, " %c%-3s - %s\r\n", 1053251135Sdes escape_char, esc_txt[i].cmd, esc_txt[i].text); 1054251135Sdes buffer_append(b, string, strlen(string)); 1055251135Sdes } 1056251135Sdes 1057251135Sdes snprintf(string, sizeof string, 1058251135Sdes " %c%c - send the escape character by typing it twice\r\n" 1059251135Sdes "(Note that escapes are only recognized immediately after " 1060251135Sdes "newline.)\r\n", escape_char, escape_char); 1061251135Sdes buffer_append(b, string, strlen(string)); 1062251135Sdes} 1063251135Sdes 1064181111Sdes/* 1065181111Sdes * Process the characters one by one, call with c==NULL for proto1 case. 1066181111Sdes */ 106792555Sdesstatic int 1068181111Sdesprocess_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr, 1069181111Sdes char *buf, int len) 107065668Skris{ 107165668Skris char string[1024]; 107265668Skris pid_t pid; 107365668Skris int bytes = 0; 107476259Sgreen u_int i; 107576259Sgreen u_char ch; 107665668Skris char *s; 1077181111Sdes int *escape_pendingp, escape_char; 1078181111Sdes struct escape_filter_ctx *efc; 107965668Skris 1080181111Sdes if (c == NULL) { 1081181111Sdes escape_pendingp = &escape_pending1; 1082181111Sdes escape_char = escape_char1; 1083181111Sdes } else { 1084181111Sdes if (c->filter_ctx == NULL) 1085181111Sdes return 0; 1086181111Sdes efc = (struct escape_filter_ctx *)c->filter_ctx; 1087181111Sdes escape_pendingp = &efc->escape_pending; 1088181111Sdes escape_char = efc->escape_char; 1089181111Sdes } 1090181111Sdes 1091149749Sdes if (len <= 0) 1092149749Sdes return (0); 1093149749Sdes 1094149749Sdes for (i = 0; i < (u_int)len; i++) { 109565668Skris /* Get one character at a time. */ 109665668Skris ch = buf[i]; 109765668Skris 1098181111Sdes if (*escape_pendingp) { 109965668Skris /* We have previously seen an escape character. */ 110065668Skris /* Clear the flag now. */ 1101181111Sdes *escape_pendingp = 0; 110265668Skris 110365668Skris /* Process the escaped character. */ 110465668Skris switch (ch) { 110565668Skris case '.': 110665668Skris /* Terminate the connection. */ 1107181111Sdes snprintf(string, sizeof string, "%c.\r\n", 1108181111Sdes escape_char); 110965668Skris buffer_append(berr, string, strlen(string)); 111065668Skris 1111204917Sdes if (c && c->ctl_chan != -1) { 1112181111Sdes chan_read_failed(c); 1113181111Sdes chan_write_failed(c); 1114263970Sdes if (c->detach_user) 1115263970Sdes c->detach_user(c->self, NULL); 1116263970Sdes c->type = SSH_CHANNEL_ABANDONED; 1117263970Sdes buffer_clear(&c->input); 1118263970Sdes chan_ibuf_empty(c); 1119181111Sdes return 0; 1120181111Sdes } else 1121181111Sdes quit_pending = 1; 112265668Skris return -1; 112365668Skris 112465668Skris case 'Z' - 64: 1125181111Sdes /* XXX support this for mux clients */ 1126204917Sdes if (c && c->ctl_chan != -1) { 1127251135Sdes char b[16]; 1128181111Sdes noescape: 1129251135Sdes if (ch == 'Z' - 64) 1130251135Sdes snprintf(b, sizeof b, "^Z"); 1131251135Sdes else 1132251135Sdes snprintf(b, sizeof b, "%c", ch); 1133181111Sdes snprintf(string, sizeof string, 1134251135Sdes "%c%s escape not available to " 1135181111Sdes "multiplexed sessions\r\n", 1136251135Sdes escape_char, b); 1137181111Sdes buffer_append(berr, string, 1138181111Sdes strlen(string)); 1139181111Sdes continue; 1140181111Sdes } 1141181111Sdes /* Suspend the program. Inform the user */ 1142181111Sdes snprintf(string, sizeof string, 1143181111Sdes "%c^Z [suspend ssh]\r\n", escape_char); 114465668Skris buffer_append(berr, string, strlen(string)); 114565668Skris 114665668Skris /* Restore terminal modes and suspend. */ 114765668Skris client_suspend_self(bin, bout, berr); 114865668Skris 114965668Skris /* We have been continued. */ 115065668Skris continue; 115165668Skris 1152124208Sdes case 'B': 1153124208Sdes if (compat20) { 1154124208Sdes snprintf(string, sizeof string, 1155124208Sdes "%cB\r\n", escape_char); 1156124208Sdes buffer_append(berr, string, 1157124208Sdes strlen(string)); 1158263970Sdes channel_request_start(c->self, 1159124208Sdes "break", 0); 1160124208Sdes packet_put_int(1000); 1161124208Sdes packet_send(); 1162124208Sdes } 1163124208Sdes continue; 1164124208Sdes 116576259Sgreen case 'R': 116676259Sgreen if (compat20) { 116776259Sgreen if (datafellows & SSH_BUG_NOREKEY) 1168181111Sdes logit("Server does not " 1169181111Sdes "support re-keying"); 117076259Sgreen else 117176259Sgreen need_rekeying = 1; 117276259Sgreen } 117376259Sgreen continue; 117476259Sgreen 1175251135Sdes case 'V': 1176251135Sdes /* FALLTHROUGH */ 1177251135Sdes case 'v': 1178251135Sdes if (c && c->ctl_chan != -1) 1179251135Sdes goto noescape; 1180251135Sdes if (!log_is_on_stderr()) { 1181251135Sdes snprintf(string, sizeof string, 1182251135Sdes "%c%c [Logging to syslog]\r\n", 1183251135Sdes escape_char, ch); 1184251135Sdes buffer_append(berr, string, 1185251135Sdes strlen(string)); 1186251135Sdes continue; 1187251135Sdes } 1188251135Sdes if (ch == 'V' && options.log_level > 1189251135Sdes SYSLOG_LEVEL_QUIET) 1190251135Sdes log_change_level(--options.log_level); 1191251135Sdes if (ch == 'v' && options.log_level < 1192251135Sdes SYSLOG_LEVEL_DEBUG3) 1193251135Sdes log_change_level(++options.log_level); 1194251135Sdes snprintf(string, sizeof string, 1195251135Sdes "%c%c [LogLevel %s]\r\n", escape_char, ch, 1196251135Sdes log_level_name(options.log_level)); 1197251135Sdes buffer_append(berr, string, strlen(string)); 1198251135Sdes continue; 1199251135Sdes 120065668Skris case '&': 1201204917Sdes if (c && c->ctl_chan != -1) 1202181111Sdes goto noescape; 120365668Skris /* 1204181111Sdes * Detach the program (continue to serve 1205181111Sdes * connections, but put in background and no 1206181111Sdes * more new connections). 120765668Skris */ 120865668Skris /* Restore tty modes. */ 1209247485Sdes leave_raw_mode( 1210247485Sdes options.request_tty == REQUEST_TTY_FORCE); 121165668Skris 121265668Skris /* Stop listening for new connections. */ 121365668Skris channel_stop_listening(); 121465668Skris 121592555Sdes snprintf(string, sizeof string, 121692555Sdes "%c& [backgrounded]\n", escape_char); 121792555Sdes buffer_append(berr, string, strlen(string)); 121865668Skris 121965668Skris /* Fork into background. */ 122065668Skris pid = fork(); 122165668Skris if (pid < 0) { 122265668Skris error("fork: %.100s", strerror(errno)); 122365668Skris continue; 122465668Skris } 122565668Skris if (pid != 0) { /* This is the parent. */ 122665668Skris /* The parent just exits. */ 122765668Skris exit(0); 122865668Skris } 122965668Skris /* The child continues serving connections. */ 123092555Sdes if (compat20) { 123192555Sdes buffer_append(bin, "\004", 1); 123292555Sdes /* fake EOF on stdin */ 123392555Sdes return -1; 123492555Sdes } else if (!stdin_eof) { 123592555Sdes /* 1236181111Sdes * Sending SSH_CMSG_EOF alone does not 1237181111Sdes * always appear to be enough. So we 1238181111Sdes * try to send an EOF character first. 123992555Sdes */ 124092555Sdes packet_start(SSH_CMSG_STDIN_DATA); 124192555Sdes packet_put_string("\004", 1); 124292555Sdes packet_send(); 124392555Sdes /* Close stdin. */ 124492555Sdes stdin_eof = 1; 124592555Sdes if (buffer_len(bin) == 0) { 124692555Sdes packet_start(SSH_CMSG_EOF); 124792555Sdes packet_send(); 124892555Sdes } 124992555Sdes } 125092555Sdes continue; 125165668Skris 125265668Skris case '?': 1253251135Sdes print_escape_help(berr, escape_char, compat20, 1254251135Sdes (c && c->ctl_chan != -1), 1255251135Sdes log_is_on_stderr()); 125665668Skris continue; 125765668Skris 125865668Skris case '#': 1259181111Sdes snprintf(string, sizeof string, "%c#\r\n", 1260181111Sdes escape_char); 126165668Skris buffer_append(berr, string, strlen(string)); 126265668Skris s = channel_open_message(); 126365668Skris buffer_append(berr, s, strlen(s)); 1264263970Sdes free(s); 126565668Skris continue; 126665668Skris 126798675Sdes case 'C': 1268204917Sdes if (c && c->ctl_chan != -1) 1269192595Sdes goto noescape; 127098675Sdes process_cmdline(); 127198675Sdes continue; 127298675Sdes 127365668Skris default: 127465668Skris if (ch != escape_char) { 127565668Skris buffer_put_char(bin, escape_char); 127665668Skris bytes++; 127765668Skris } 127865668Skris /* Escaped characters fall through here */ 127965668Skris break; 128065668Skris } 128165668Skris } else { 128265668Skris /* 1283181111Sdes * The previous character was not an escape char. 1284181111Sdes * Check if this is an escape. 128565668Skris */ 128665668Skris if (last_was_cr && ch == escape_char) { 1287181111Sdes /* 1288181111Sdes * It is. Set the flag and continue to 1289181111Sdes * next character. 1290181111Sdes */ 1291181111Sdes *escape_pendingp = 1; 129265668Skris continue; 129365668Skris } 129465668Skris } 129565668Skris 129665668Skris /* 129765668Skris * Normal character. Record whether it was a newline, 129865668Skris * and append it to the buffer. 129965668Skris */ 130065668Skris last_was_cr = (ch == '\r' || ch == '\n'); 130165668Skris buffer_put_char(bin, ch); 130265668Skris bytes++; 130365668Skris } 130465668Skris return bytes; 130565668Skris} 130665668Skris 130792555Sdesstatic void 1308162852Sdesclient_process_input(fd_set *readset) 130960573Skris{ 131060573Skris int len; 1311197679Sdes char buf[SSH_IOBUFSZ]; 131260573Skris 131357429Smarkm /* Read input from stdin. */ 131457429Smarkm if (FD_ISSET(fileno(stdin), readset)) { 131557429Smarkm /* Read as much as possible. */ 131657429Smarkm len = read(fileno(stdin), buf, sizeof(buf)); 1317181111Sdes if (len < 0 && 1318181111Sdes (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) 131976259Sgreen return; /* we'll try again later */ 132057429Smarkm if (len <= 0) { 132157429Smarkm /* 132257429Smarkm * Received EOF or error. They are treated 132357429Smarkm * similarly, except that an error message is printed 132457429Smarkm * if it was an error condition. 132557429Smarkm */ 132657429Smarkm if (len < 0) { 1327181111Sdes snprintf(buf, sizeof buf, "read: %.100s\r\n", 1328181111Sdes strerror(errno)); 132957429Smarkm buffer_append(&stderr_buffer, buf, strlen(buf)); 133057429Smarkm } 133157429Smarkm /* Mark that we have seen EOF. */ 133257429Smarkm stdin_eof = 1; 133357429Smarkm /* 133457429Smarkm * Send an EOF message to the server unless there is 133557429Smarkm * data in the buffer. If there is data in the 133657429Smarkm * buffer, no message will be sent now. Code 133757429Smarkm * elsewhere will send the EOF when the buffer 133857429Smarkm * becomes empty if stdin_eof is set. 133957429Smarkm */ 134057429Smarkm if (buffer_len(&stdin_buffer) == 0) { 134157429Smarkm packet_start(SSH_CMSG_EOF); 134257429Smarkm packet_send(); 134357429Smarkm } 1344181111Sdes } else if (escape_char1 == SSH_ESCAPECHAR_NONE) { 134557429Smarkm /* 134657429Smarkm * Normal successful read, and no escape character. 134757429Smarkm * Just append the data to buffer. 134857429Smarkm */ 134957429Smarkm buffer_append(&stdin_buffer, buf, len); 135057429Smarkm } else { 135157429Smarkm /* 1352181111Sdes * Normal, successful read. But we have an escape 1353181111Sdes * character and have to process the characters one 1354181111Sdes * by one. 135557429Smarkm */ 1356181111Sdes if (process_escapes(NULL, &stdin_buffer, 1357181111Sdes &stdout_buffer, &stderr_buffer, buf, len) == -1) 135865668Skris return; 135957429Smarkm } 136057429Smarkm } 136157429Smarkm} 136257429Smarkm 136392555Sdesstatic void 1364162852Sdesclient_process_output(fd_set *writeset) 136557429Smarkm{ 136657429Smarkm int len; 136757429Smarkm char buf[100]; 136857429Smarkm 136957429Smarkm /* Write buffered output to stdout. */ 137057429Smarkm if (FD_ISSET(fileno(stdout), writeset)) { 137157429Smarkm /* Write as much data as possible. */ 137257429Smarkm len = write(fileno(stdout), buffer_ptr(&stdout_buffer), 137357429Smarkm buffer_len(&stdout_buffer)); 137457429Smarkm if (len <= 0) { 1375181111Sdes if (errno == EINTR || errno == EAGAIN || 1376181111Sdes errno == EWOULDBLOCK) 137757429Smarkm len = 0; 137857429Smarkm else { 137957429Smarkm /* 138057429Smarkm * An error or EOF was encountered. Put an 138157429Smarkm * error message to stderr buffer. 138257429Smarkm */ 1383181111Sdes snprintf(buf, sizeof buf, 1384181111Sdes "write stdout: %.50s\r\n", strerror(errno)); 138557429Smarkm buffer_append(&stderr_buffer, buf, strlen(buf)); 138657429Smarkm quit_pending = 1; 138757429Smarkm return; 138857429Smarkm } 138957429Smarkm } 139057429Smarkm /* Consume printed data from the buffer. */ 139157429Smarkm buffer_consume(&stdout_buffer, len); 139257429Smarkm } 139357429Smarkm /* Write buffered output to stderr. */ 139457429Smarkm if (FD_ISSET(fileno(stderr), writeset)) { 139557429Smarkm /* Write as much data as possible. */ 139657429Smarkm len = write(fileno(stderr), buffer_ptr(&stderr_buffer), 139757429Smarkm buffer_len(&stderr_buffer)); 139857429Smarkm if (len <= 0) { 1399181111Sdes if (errno == EINTR || errno == EAGAIN || 1400181111Sdes errno == EWOULDBLOCK) 140157429Smarkm len = 0; 140257429Smarkm else { 1403181111Sdes /* 1404181111Sdes * EOF or error, but can't even print 1405181111Sdes * error message. 1406181111Sdes */ 140757429Smarkm quit_pending = 1; 140857429Smarkm return; 140957429Smarkm } 141057429Smarkm } 141157429Smarkm /* Consume printed characters from the buffer. */ 141257429Smarkm buffer_consume(&stderr_buffer, len); 141357429Smarkm } 141457429Smarkm} 141557429Smarkm 141657429Smarkm/* 141760573Skris * Get packets from the connection input buffer, and process them as long as 141860573Skris * there are packets available. 141960573Skris * 142060573Skris * Any unknown packets received during the actual 142160573Skris * session cause the session to terminate. This is 142260573Skris * intended to make debugging easier since no 142360573Skris * confirmations are sent. Any compatible protocol 142460573Skris * extensions must be negotiated during the 142560573Skris * preparatory phase. 142660573Skris */ 142760573Skris 142892555Sdesstatic void 142976259Sgreenclient_process_buffered_input_packets(void) 143060573Skris{ 1431181111Sdes dispatch_run(DISPATCH_NONBLOCK, &quit_pending, 1432181111Sdes compat20 ? xxx_kex : NULL); 143360573Skris} 143460573Skris 143565668Skris/* scan buf[] for '~' before sending data to the peer */ 143665668Skris 1437181111Sdes/* Helper: allocate a new escape_filter_ctx and fill in its escape char */ 1438181111Sdesvoid * 1439181111Sdesclient_new_escape_filter_ctx(int escape_char) 144065668Skris{ 1441181111Sdes struct escape_filter_ctx *ret; 1442181111Sdes 1443263970Sdes ret = xcalloc(1, sizeof(*ret)); 1444181111Sdes ret->escape_pending = 0; 1445181111Sdes ret->escape_char = escape_char; 1446181111Sdes return (void *)ret; 144765668Skris} 144865668Skris 1449181111Sdes/* Free the escape filter context on channel free */ 1450181111Sdesvoid 1451181111Sdesclient_filter_cleanup(int cid, void *ctx) 1452181111Sdes{ 1453263970Sdes free(ctx); 1454181111Sdes} 1455181111Sdes 1456181111Sdesint 1457181111Sdesclient_simple_escape_filter(Channel *c, char *buf, int len) 1458181111Sdes{ 1459181111Sdes if (c->extended_usage != CHAN_EXTENDED_WRITE) 1460181111Sdes return 0; 1461181111Sdes 1462181111Sdes return process_escapes(c, &c->input, &c->output, &c->extended, 1463181111Sdes buf, len); 1464181111Sdes} 1465181111Sdes 146692555Sdesstatic void 146776259Sgreenclient_channel_closed(int id, void *arg) 146876259Sgreen{ 146992555Sdes channel_cancel_cleanup(id); 147076259Sgreen session_closed = 1; 1471247485Sdes leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 147276259Sgreen} 147376259Sgreen 147460573Skris/* 147557429Smarkm * Implements the interactive session with the server. This is called after 147657429Smarkm * the user has been authenticated, and a command has been started on the 147792555Sdes * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character 147892555Sdes * used as an escape character for terminating or suspending the session. 147957429Smarkm */ 148057429Smarkm 148160573Skrisint 148265668Skrisclient_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) 148357429Smarkm{ 148476259Sgreen fd_set *readset = NULL, *writeset = NULL; 148557429Smarkm double start_time, total_time; 1486137015Sdes int max_fd = 0, max_fd2 = 0, len, rekeying = 0; 1487181111Sdes u_int64_t ibytes, obytes; 1488137015Sdes u_int nalloc = 0; 148957429Smarkm char buf[100]; 149057429Smarkm 149157429Smarkm debug("Entering interactive session."); 149257429Smarkm 149357429Smarkm start_time = get_current_time(); 149457429Smarkm 149557429Smarkm /* Initialize variables. */ 1496181111Sdes escape_pending1 = 0; 149757429Smarkm last_was_cr = 1; 149857429Smarkm exit_status = -1; 149957429Smarkm stdin_eof = 0; 150057429Smarkm buffer_high = 64 * 1024; 150157429Smarkm connection_in = packet_get_connection_in(); 150257429Smarkm connection_out = packet_get_connection_out(); 150376259Sgreen max_fd = MAX(connection_in, connection_out); 150476259Sgreen 150576259Sgreen if (!compat20) { 150676259Sgreen /* enable nonblocking unless tty */ 150776259Sgreen if (!isatty(fileno(stdin))) 150876259Sgreen set_nonblock(fileno(stdin)); 150976259Sgreen if (!isatty(fileno(stdout))) 151076259Sgreen set_nonblock(fileno(stdout)); 151176259Sgreen if (!isatty(fileno(stderr))) 151276259Sgreen set_nonblock(fileno(stderr)); 151376259Sgreen max_fd = MAX(max_fd, fileno(stdin)); 151476259Sgreen max_fd = MAX(max_fd, fileno(stdout)); 151576259Sgreen max_fd = MAX(max_fd, fileno(stderr)); 151676259Sgreen } 151757429Smarkm quit_pending = 0; 1518181111Sdes escape_char1 = escape_char_arg; 151957429Smarkm 152057429Smarkm /* Initialize buffers. */ 152157429Smarkm buffer_init(&stdin_buffer); 152257429Smarkm buffer_init(&stdout_buffer); 152357429Smarkm buffer_init(&stderr_buffer); 152457429Smarkm 152560573Skris client_init_dispatch(); 152660573Skris 1527113908Sdes /* 1528113908Sdes * Set signal handlers, (e.g. to restore non-blocking mode) 1529113908Sdes * but don't overwrite SIG_IGN, matches behaviour from rsh(1) 1530113908Sdes */ 1531146998Sdes if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 1532146998Sdes signal(SIGHUP, signal_handler); 1533113908Sdes if (signal(SIGINT, SIG_IGN) != SIG_IGN) 1534113908Sdes signal(SIGINT, signal_handler); 1535113908Sdes if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) 1536113908Sdes signal(SIGQUIT, signal_handler); 1537113908Sdes if (signal(SIGTERM, SIG_IGN) != SIG_IGN) 1538113908Sdes signal(SIGTERM, signal_handler); 1539146998Sdes signal(SIGWINCH, window_change_handler); 154057429Smarkm 154157429Smarkm if (have_pty) 1542247485Sdes enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 154357429Smarkm 154476259Sgreen if (compat20) { 154576259Sgreen session_ident = ssh2_chan_id; 1546247485Sdes if (session_ident != -1) { 1547247485Sdes if (escape_char_arg != SSH_ESCAPECHAR_NONE) { 1548247485Sdes channel_register_filter(session_ident, 1549247485Sdes client_simple_escape_filter, NULL, 1550247485Sdes client_filter_cleanup, 1551247485Sdes client_new_escape_filter_ctx( 1552247485Sdes escape_char_arg)); 1553247485Sdes } 155476259Sgreen channel_register_cleanup(session_ident, 1555157016Sdes client_channel_closed, 0); 1556247485Sdes } 155776259Sgreen } else { 155876259Sgreen /* Check if we should immediately send eof on stdin. */ 155960573Skris client_check_initial_eof_on_stdin(); 156076259Sgreen } 156157429Smarkm 156257429Smarkm /* Main loop of the client for the interactive session mode. */ 156357429Smarkm while (!quit_pending) { 156457429Smarkm 156557429Smarkm /* Process buffered packets sent by the server. */ 156657429Smarkm client_process_buffered_input_packets(); 156757429Smarkm 156876259Sgreen if (compat20 && session_closed && !channel_still_open()) 156960573Skris break; 157060573Skris 157176259Sgreen rekeying = (xxx_kex != NULL && !xxx_kex->done); 157257429Smarkm 157376259Sgreen if (rekeying) { 157476259Sgreen debug("rekeying in progress"); 157576259Sgreen } else { 157676259Sgreen /* 157776259Sgreen * Make packets of buffered stdin data, and buffer 157876259Sgreen * them for sending to the server. 157976259Sgreen */ 158076259Sgreen if (!compat20) 158176259Sgreen client_make_packets_from_stdin_data(); 158257429Smarkm 158376259Sgreen /* 158476259Sgreen * Make packets from buffered channel data, and 158576259Sgreen * enqueue them for sending to the server. 158676259Sgreen */ 158776259Sgreen if (packet_not_very_much_data_to_write()) 158876259Sgreen channel_output_poll(); 158957429Smarkm 159076259Sgreen /* 159176259Sgreen * Check if the window size has changed, and buffer a 159276259Sgreen * message about it to the server if so. 159376259Sgreen */ 159476259Sgreen client_check_window_change(); 159557429Smarkm 159676259Sgreen if (quit_pending) 159776259Sgreen break; 159876259Sgreen } 159957429Smarkm /* 160057429Smarkm * Wait until we have something to do (something becomes 160157429Smarkm * available on one of the descriptors). 160257429Smarkm */ 160392555Sdes max_fd2 = max_fd; 160476259Sgreen client_wait_until_can_do_something(&readset, &writeset, 160592555Sdes &max_fd2, &nalloc, rekeying); 160657429Smarkm 160757429Smarkm if (quit_pending) 160857429Smarkm break; 160957429Smarkm 161076259Sgreen /* Do channel operations unless rekeying in progress. */ 161176259Sgreen if (!rekeying) { 161276259Sgreen channel_after_select(readset, writeset); 1613124208Sdes if (need_rekeying || packet_need_rekeying()) { 1614124208Sdes debug("need rekeying"); 161576259Sgreen xxx_kex->done = 0; 161676259Sgreen kex_send_kexinit(xxx_kex); 161776259Sgreen need_rekeying = 0; 161876259Sgreen } 161976259Sgreen } 162076259Sgreen 162160573Skris /* Buffer input from the connection. */ 162276259Sgreen client_process_net_input(readset); 162357429Smarkm 162460573Skris if (quit_pending) 162560573Skris break; 162657429Smarkm 162760573Skris if (!compat20) { 162860573Skris /* Buffer data from stdin */ 162976259Sgreen client_process_input(readset); 163060573Skris /* 163160573Skris * Process output to stdout and stderr. Output to 163260573Skris * the connection is processed elsewhere (above). 163360573Skris */ 163476259Sgreen client_process_output(writeset); 163560573Skris } 163660573Skris 1637204917Sdes if (session_resumed) { 1638204917Sdes connection_in = packet_get_connection_in(); 1639204917Sdes connection_out = packet_get_connection_out(); 1640204917Sdes max_fd = MAX(max_fd, connection_out); 1641204917Sdes max_fd = MAX(max_fd, connection_in); 1642204917Sdes session_resumed = 0; 1643204917Sdes } 1644204917Sdes 1645181111Sdes /* 1646181111Sdes * Send as much buffered packet data as possible to the 1647181111Sdes * sender. 1648181111Sdes */ 164976259Sgreen if (FD_ISSET(connection_out, writeset)) 165057429Smarkm packet_write_poll(); 1651215116Sdes 1652215116Sdes /* 1653215116Sdes * If we are a backgrounded control master, and the 1654215116Sdes * timeout has expired without any active client 1655215116Sdes * connections, then quit. 1656215116Sdes */ 1657215116Sdes if (control_persist_exit_time > 0) { 1658263970Sdes if (monotime() >= control_persist_exit_time) { 1659215116Sdes debug("ControlPersist timeout expired"); 1660215116Sdes break; 1661215116Sdes } 1662215116Sdes } 166357429Smarkm } 1664263970Sdes free(readset); 1665263970Sdes free(writeset); 166657429Smarkm 166757429Smarkm /* Terminate the session. */ 166857429Smarkm 166957429Smarkm /* Stop watching for window change. */ 1670146998Sdes signal(SIGWINCH, SIG_DFL); 167157429Smarkm 1672197679Sdes if (compat20) { 1673197679Sdes packet_start(SSH2_MSG_DISCONNECT); 1674197679Sdes packet_put_int(SSH2_DISCONNECT_BY_APPLICATION); 1675197679Sdes packet_put_cstring("disconnected by user"); 1676207319Sdes packet_put_cstring(""); /* language tag */ 1677197679Sdes packet_send(); 1678197679Sdes packet_write_wait(); 1679197679Sdes } 1680197679Sdes 168192555Sdes channel_free_all(); 168257429Smarkm 168392555Sdes if (have_pty) 1684247485Sdes leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 168592555Sdes 168692555Sdes /* restore blocking io */ 168792555Sdes if (!isatty(fileno(stdin))) 168892555Sdes unset_nonblock(fileno(stdin)); 168992555Sdes if (!isatty(fileno(stdout))) 169092555Sdes unset_nonblock(fileno(stdout)); 169192555Sdes if (!isatty(fileno(stderr))) 169292555Sdes unset_nonblock(fileno(stderr)); 169392555Sdes 1694126274Sdes /* 1695126274Sdes * If there was no shell or command requested, there will be no remote 1696126274Sdes * exit status to be returned. In that case, clear error code if the 1697126274Sdes * connection was deliberately terminated at this end. 1698126274Sdes */ 1699126274Sdes if (no_shell_flag && received_signal == SIGTERM) { 1700126274Sdes received_signal = 0; 1701126274Sdes exit_status = 0; 170292555Sdes } 170392555Sdes 1704126274Sdes if (received_signal) 1705126274Sdes fatal("Killed by signal %d.", (int) received_signal); 1706126274Sdes 170757429Smarkm /* 170857429Smarkm * In interactive mode (with pseudo tty) display a message indicating 170957429Smarkm * that the connection has been closed. 171057429Smarkm */ 171157429Smarkm if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { 1712181111Sdes snprintf(buf, sizeof buf, 1713181111Sdes "Connection to %.64s closed.\r\n", host); 171457429Smarkm buffer_append(&stderr_buffer, buf, strlen(buf)); 171557429Smarkm } 171692555Sdes 171757429Smarkm /* Output any buffered data for stdout. */ 1718221420Sdes if (buffer_len(&stdout_buffer) > 0) { 1719221420Sdes len = atomicio(vwrite, fileno(stdout), 1720221420Sdes buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer)); 1721221420Sdes if (len < 0 || (u_int)len != buffer_len(&stdout_buffer)) 172257429Smarkm error("Write failed flushing stdout buffer."); 1723221420Sdes else 1724221420Sdes buffer_consume(&stdout_buffer, len); 172557429Smarkm } 172657429Smarkm 172757429Smarkm /* Output any buffered data for stderr. */ 1728221420Sdes if (buffer_len(&stderr_buffer) > 0) { 1729221420Sdes len = atomicio(vwrite, fileno(stderr), 1730221420Sdes buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer)); 1731221420Sdes if (len < 0 || (u_int)len != buffer_len(&stderr_buffer)) 173257429Smarkm error("Write failed flushing stderr buffer."); 1733221420Sdes else 1734221420Sdes buffer_consume(&stderr_buffer, len); 173557429Smarkm } 173657429Smarkm 173757429Smarkm /* Clear and free any buffers. */ 173857429Smarkm memset(buf, 0, sizeof(buf)); 173957429Smarkm buffer_free(&stdin_buffer); 174057429Smarkm buffer_free(&stdout_buffer); 174157429Smarkm buffer_free(&stderr_buffer); 174257429Smarkm 174357429Smarkm /* Report bytes transferred, and transfer rates. */ 174457429Smarkm total_time = get_current_time() - start_time; 1745181111Sdes packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes); 1746181111Sdes packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes); 1747181111Sdes verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds", 1748221420Sdes (unsigned long long)obytes, (unsigned long long)ibytes, total_time); 174957429Smarkm if (total_time > 0) 1750181111Sdes verbose("Bytes per second: sent %.1f, received %.1f", 1751181111Sdes obytes / total_time, ibytes / total_time); 175257429Smarkm /* Return the exit status of the program. */ 175357429Smarkm debug("Exit status %d", exit_status); 175457429Smarkm return exit_status; 175557429Smarkm} 175660573Skris 175760573Skris/*********/ 175860573Skris 175992555Sdesstatic void 176092555Sdesclient_input_stdout_data(int type, u_int32_t seq, void *ctxt) 176160573Skris{ 176276259Sgreen u_int data_len; 176360573Skris char *data = packet_get_string(&data_len); 176492555Sdes packet_check_eom(); 176560573Skris buffer_append(&stdout_buffer, data, data_len); 1766263970Sdes explicit_bzero(data, data_len); 1767263970Sdes free(data); 176860573Skris} 176992555Sdesstatic void 177092555Sdesclient_input_stderr_data(int type, u_int32_t seq, void *ctxt) 177160573Skris{ 177276259Sgreen u_int data_len; 177360573Skris char *data = packet_get_string(&data_len); 177492555Sdes packet_check_eom(); 177560573Skris buffer_append(&stderr_buffer, data, data_len); 1776263970Sdes explicit_bzero(data, data_len); 1777263970Sdes free(data); 177860573Skris} 177992555Sdesstatic void 178092555Sdesclient_input_exit_status(int type, u_int32_t seq, void *ctxt) 178160573Skris{ 178260573Skris exit_status = packet_get_int(); 178392555Sdes packet_check_eom(); 178460573Skris /* Acknowledge the exit. */ 178560573Skris packet_start(SSH_CMSG_EXIT_CONFIRMATION); 178660573Skris packet_send(); 178760573Skris /* 178860573Skris * Must wait for packet to be sent since we are 178960573Skris * exiting the loop. 179060573Skris */ 179160573Skris packet_write_wait(); 179260573Skris /* Flag that we want to exit. */ 179360573Skris quit_pending = 1; 179460573Skris} 1795126274Sdesstatic void 1796126274Sdesclient_input_agent_open(int type, u_int32_t seq, void *ctxt) 1797126274Sdes{ 1798126274Sdes Channel *c = NULL; 1799126274Sdes int remote_id, sock; 180060573Skris 1801126274Sdes /* Read the remote channel number from the message. */ 1802126274Sdes remote_id = packet_get_int(); 1803126274Sdes packet_check_eom(); 1804126274Sdes 1805126274Sdes /* 1806126274Sdes * Get a connection to the local authentication agent (this may again 1807126274Sdes * get forwarded). 1808126274Sdes */ 1809126274Sdes sock = ssh_get_authentication_socket(); 1810126274Sdes 1811126274Sdes /* 1812126274Sdes * If we could not connect the agent, send an error message back to 1813126274Sdes * the server. This should never happen unless the agent dies, 1814126274Sdes * because authentication forwarding is only enabled if we have an 1815126274Sdes * agent. 1816126274Sdes */ 1817126274Sdes if (sock >= 0) { 1818126274Sdes c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, 1819126274Sdes -1, 0, 0, 0, "authentication agent connection", 1); 1820126274Sdes c->remote_id = remote_id; 1821126274Sdes c->force_drain = 1; 1822126274Sdes } 1823126274Sdes if (c == NULL) { 1824126274Sdes packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); 1825126274Sdes packet_put_int(remote_id); 1826126274Sdes } else { 1827126274Sdes /* Send a confirmation to the remote host. */ 1828126274Sdes debug("Forwarding authentication connection."); 1829126274Sdes packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); 1830126274Sdes packet_put_int(remote_id); 1831126274Sdes packet_put_int(c->self); 1832126274Sdes } 1833126274Sdes packet_send(); 1834126274Sdes} 1835126274Sdes 183692555Sdesstatic Channel * 183776259Sgreenclient_request_forwarded_tcpip(const char *request_type, int rchan) 183876259Sgreen{ 1839106121Sdes Channel *c = NULL; 184076259Sgreen char *listen_address, *originator_address; 1841192595Sdes u_short listen_port, originator_port; 184276259Sgreen 184376259Sgreen /* Get rest of the packet */ 184476259Sgreen listen_address = packet_get_string(NULL); 184576259Sgreen listen_port = packet_get_int(); 184676259Sgreen originator_address = packet_get_string(NULL); 184776259Sgreen originator_port = packet_get_int(); 184892555Sdes packet_check_eom(); 184976259Sgreen 1850181111Sdes debug("client_request_forwarded_tcpip: listen %s port %d, " 1851181111Sdes "originator %s port %d", listen_address, listen_port, 1852181111Sdes originator_address, originator_port); 185376259Sgreen 1854181111Sdes c = channel_connect_by_listen_address(listen_port, 1855181111Sdes "forwarded-tcpip", originator_address); 1856181111Sdes 1857263970Sdes free(originator_address); 1858263970Sdes free(listen_address); 185976259Sgreen return c; 186076259Sgreen} 186176259Sgreen 1862106121Sdesstatic Channel * 186376259Sgreenclient_request_x11(const char *request_type, int rchan) 186476259Sgreen{ 186576259Sgreen Channel *c = NULL; 186676259Sgreen char *originator; 1867192595Sdes u_short originator_port; 186892555Sdes int sock; 186976259Sgreen 187076259Sgreen if (!options.forward_x11) { 187176259Sgreen error("Warning: ssh server tried X11 forwarding."); 1872181111Sdes error("Warning: this is probably a break-in attempt by a " 1873181111Sdes "malicious server."); 187476259Sgreen return NULL; 187576259Sgreen } 1876263970Sdes if (x11_refuse_time != 0 && monotime() >= x11_refuse_time) { 1877215116Sdes verbose("Rejected X11 connection after ForwardX11Timeout " 1878215116Sdes "expired"); 1879215116Sdes return NULL; 1880215116Sdes } 188176259Sgreen originator = packet_get_string(NULL); 188276259Sgreen if (datafellows & SSH_BUG_X11FWD) { 188376259Sgreen debug2("buggy server: x11 request w/o originator_port"); 188476259Sgreen originator_port = 0; 188576259Sgreen } else { 188676259Sgreen originator_port = packet_get_int(); 188776259Sgreen } 188892555Sdes packet_check_eom(); 188976259Sgreen /* XXX check permission */ 189076259Sgreen debug("client_request_x11: request from %s %d", originator, 189176259Sgreen originator_port); 1892263970Sdes free(originator); 189376259Sgreen sock = x11_connect_display(); 189492555Sdes if (sock < 0) 189592555Sdes return NULL; 1896224638Sbrooks if (options.hpn_disabled) 1897224638Sbrooks c = channel_new("x11", SSH_CHANNEL_X11_OPEN, sock, sock, -1, 1898224638Sbrooks CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 1899224638Sbrooks 0, "x11", 1); 1900224638Sbrooks else 1901224638Sbrooks c = channel_new("x11", SSH_CHANNEL_X11_OPEN, sock, sock, -1, 1902224638Sbrooks options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 1903224638Sbrooks 0, "x11", 1); 190492555Sdes c->force_drain = 1; 190576259Sgreen return c; 190676259Sgreen} 190776259Sgreen 1908106121Sdesstatic Channel * 190976259Sgreenclient_request_agent(const char *request_type, int rchan) 191076259Sgreen{ 191176259Sgreen Channel *c = NULL; 191292555Sdes int sock; 191376259Sgreen 191476259Sgreen if (!options.forward_agent) { 191576259Sgreen error("Warning: ssh server tried agent forwarding."); 1916181111Sdes error("Warning: this is probably a break-in attempt by a " 1917181111Sdes "malicious server."); 191876259Sgreen return NULL; 191976259Sgreen } 1920181111Sdes sock = ssh_get_authentication_socket(); 192192555Sdes if (sock < 0) 192292555Sdes return NULL; 1923224638Sbrooks if (options.hpn_disabled) 1924224638Sbrooks c = channel_new("authentication agent connection", 1925224638Sbrooks SSH_CHANNEL_OPEN, sock, sock, -1, 1926224638Sbrooks CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, 1927224638Sbrooks "authentication agent connection", 1); 1928224638Sbrooks else 1929224638Sbrooks c = channel_new("authentication agent connection", 1930224638Sbrooks SSH_CHANNEL_OPEN, sock, sock, -1, 1931224638Sbrooks options.hpn_buffer_size, options.hpn_buffer_size, 0, 1932224638Sbrooks "authentication agent connection", 1); 193392555Sdes c->force_drain = 1; 193476259Sgreen return c; 193576259Sgreen} 193676259Sgreen 1937181111Sdesint 1938181111Sdesclient_request_tun_fwd(int tun_mode, int local_tun, int remote_tun) 1939181111Sdes{ 1940181111Sdes Channel *c; 1941181111Sdes int fd; 1942181111Sdes 1943181111Sdes if (tun_mode == SSH_TUNMODE_NO) 1944181111Sdes return 0; 1945181111Sdes 1946181111Sdes if (!compat20) { 1947192595Sdes error("Tunnel forwarding is not supported for protocol 1"); 1948181111Sdes return -1; 1949181111Sdes } 1950181111Sdes 1951181111Sdes debug("Requesting tun unit %d in mode %d", local_tun, tun_mode); 1952181111Sdes 1953181111Sdes /* Open local tunnel device */ 1954181111Sdes if ((fd = tun_open(local_tun, tun_mode)) == -1) { 1955181111Sdes error("Tunnel device open failed."); 1956181111Sdes return -1; 1957181111Sdes } 1958181111Sdes 1959224638Sbrooks if (options.hpn_disabled) 1960224638Sbrooks c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, 1961224638Sbrooks CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 1962224638Sbrooks 0, "tun", 1); 1963224638Sbrooks else 1964224638Sbrooks c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, 1965224638Sbrooks options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT, 1966224638Sbrooks 0, "tun", 1); 1967181111Sdes c->datagram = 1; 1968181111Sdes 1969181111Sdes#if defined(SSH_TUN_FILTER) 1970181111Sdes if (options.tun_open == SSH_TUNMODE_POINTOPOINT) 1971181111Sdes channel_register_filter(c->self, sys_tun_infilter, 1972181111Sdes sys_tun_outfilter, NULL, NULL); 1973181111Sdes#endif 1974181111Sdes 1975181111Sdes packet_start(SSH2_MSG_CHANNEL_OPEN); 1976181111Sdes packet_put_cstring("tun@openssh.com"); 1977181111Sdes packet_put_int(c->self); 1978181111Sdes packet_put_int(c->local_window_max); 1979181111Sdes packet_put_int(c->local_maxpacket); 1980181111Sdes packet_put_int(tun_mode); 1981181111Sdes packet_put_int(remote_tun); 1982181111Sdes packet_send(); 1983181111Sdes 1984181111Sdes return 0; 1985181111Sdes} 1986181111Sdes 198760573Skris/* XXXX move to generic input handler */ 198892555Sdesstatic void 198992555Sdesclient_input_channel_open(int type, u_int32_t seq, void *ctxt) 199060573Skris{ 199160573Skris Channel *c = NULL; 199260573Skris char *ctype; 199360573Skris int rchan; 199499060Sdes u_int rmaxpack, rwindow, len; 199560573Skris 199660573Skris ctype = packet_get_string(&len); 199760573Skris rchan = packet_get_int(); 199860573Skris rwindow = packet_get_int(); 199960573Skris rmaxpack = packet_get_int(); 200060573Skris 200160573Skris debug("client_input_channel_open: ctype %s rchan %d win %d max %d", 200260573Skris ctype, rchan, rwindow, rmaxpack); 200360573Skris 200476259Sgreen if (strcmp(ctype, "forwarded-tcpip") == 0) { 200576259Sgreen c = client_request_forwarded_tcpip(ctype, rchan); 200676259Sgreen } else if (strcmp(ctype, "x11") == 0) { 200776259Sgreen c = client_request_x11(ctype, rchan); 200876259Sgreen } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { 200976259Sgreen c = client_request_agent(ctype, rchan); 201060573Skris } 201160573Skris/* XXX duplicate : */ 201260573Skris if (c != NULL) { 201360573Skris debug("confirm %s", ctype); 201460573Skris c->remote_id = rchan; 201560573Skris c->remote_window = rwindow; 201660573Skris c->remote_maxpacket = rmaxpack; 201792555Sdes if (c->type != SSH_CHANNEL_CONNECTING) { 201892555Sdes packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); 201992555Sdes packet_put_int(c->remote_id); 202092555Sdes packet_put_int(c->self); 202192555Sdes packet_put_int(c->local_window); 202292555Sdes packet_put_int(c->local_maxpacket); 202392555Sdes packet_send(); 202492555Sdes } 202560573Skris } else { 202660573Skris debug("failure %s", ctype); 202760573Skris packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); 202860573Skris packet_put_int(rchan); 202960573Skris packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); 203092555Sdes if (!(datafellows & SSH_BUG_OPENFAILURE)) { 203192555Sdes packet_put_cstring("open failed"); 203292555Sdes packet_put_cstring(""); 203392555Sdes } 203460573Skris packet_send(); 203560573Skris } 2036263970Sdes free(ctype); 203760573Skris} 203892555Sdesstatic void 203992555Sdesclient_input_channel_req(int type, u_int32_t seq, void *ctxt) 204076259Sgreen{ 204176259Sgreen Channel *c = NULL; 2042137015Sdes int exitval, id, reply, success = 0; 204376259Sgreen char *rtype; 204460573Skris 204576259Sgreen id = packet_get_int(); 204676259Sgreen rtype = packet_get_string(NULL); 204776259Sgreen reply = packet_get_char(); 204876259Sgreen 204976259Sgreen debug("client_input_channel_req: channel %d rtype %s reply %d", 205076259Sgreen id, rtype, reply); 205176259Sgreen 2052137015Sdes if (id == -1) { 2053137015Sdes error("client_input_channel_req: request for channel -1"); 2054137015Sdes } else if ((c = channel_lookup(id)) == NULL) { 2055181111Sdes error("client_input_channel_req: channel %d: " 2056181111Sdes "unknown channel", id); 2057181111Sdes } else if (strcmp(rtype, "eow@openssh.com") == 0) { 2058181111Sdes packet_check_eom(); 2059181111Sdes chan_rcvd_eow(c); 206076259Sgreen } else if (strcmp(rtype, "exit-status") == 0) { 2061137015Sdes exitval = packet_get_int(); 2062204917Sdes if (c->ctl_chan != -1) { 2063204917Sdes mux_exit_message(c, exitval); 2064137015Sdes success = 1; 2065204917Sdes } else if (id == session_ident) { 2066204917Sdes /* Record exit value of local session */ 2067204917Sdes success = 1; 2068137015Sdes exit_status = exitval; 2069137015Sdes } else { 2070204917Sdes /* Probably for a mux channel that has already closed */ 2071204917Sdes debug("%s: no sink for exit-status on channel %d", 2072204917Sdes __func__, id); 2073137015Sdes } 207492555Sdes packet_check_eom(); 207576259Sgreen } 2076221420Sdes if (reply && c != NULL) { 207776259Sgreen packet_start(success ? 207876259Sgreen SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); 2079192595Sdes packet_put_int(c->remote_id); 208076259Sgreen packet_send(); 208176259Sgreen } 2082263970Sdes free(rtype); 208376259Sgreen} 208492555Sdesstatic void 208592555Sdesclient_input_global_request(int type, u_int32_t seq, void *ctxt) 208692555Sdes{ 208792555Sdes char *rtype; 208892555Sdes int want_reply; 208992555Sdes int success = 0; 209076259Sgreen 209192555Sdes rtype = packet_get_string(NULL); 209292555Sdes want_reply = packet_get_char(); 2093126274Sdes debug("client_input_global_request: rtype %s want_reply %d", 2094126274Sdes rtype, want_reply); 209592555Sdes if (want_reply) { 209692555Sdes packet_start(success ? 209792555Sdes SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); 209892555Sdes packet_send(); 209992555Sdes packet_write_wait(); 210092555Sdes } 2101263970Sdes free(rtype); 210292555Sdes} 210392555Sdes 2104137015Sdesvoid 2105137015Sdesclient_session2_setup(int id, int want_tty, int want_subsystem, 2106181111Sdes const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env) 2107137015Sdes{ 2108137015Sdes int len; 2109146998Sdes Channel *c = NULL; 2110137015Sdes 2111137015Sdes debug2("%s: id %d", __func__, id); 2112137015Sdes 2113146998Sdes if ((c = channel_lookup(id)) == NULL) 2114146998Sdes fatal("client_session2_setup: channel %d: unknown channel", id); 2115146998Sdes 2116221420Sdes packet_set_interactive(want_tty, 2117221420Sdes options.ip_qos_interactive, options.ip_qos_bulk); 2118221420Sdes 2119137015Sdes if (want_tty) { 2120137015Sdes struct winsize ws; 2121137015Sdes 2122137015Sdes /* Store window size in the packet. */ 2123137015Sdes if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) 2124137015Sdes memset(&ws, 0, sizeof(ws)); 2125137015Sdes 2126181111Sdes channel_request_start(id, "pty-req", 1); 2127247485Sdes client_expect_confirm(id, "PTY allocation", CONFIRM_TTY); 2128137015Sdes packet_put_cstring(term != NULL ? term : ""); 2129162852Sdes packet_put_int((u_int)ws.ws_col); 2130162852Sdes packet_put_int((u_int)ws.ws_row); 2131162852Sdes packet_put_int((u_int)ws.ws_xpixel); 2132162852Sdes packet_put_int((u_int)ws.ws_ypixel); 2133181111Sdes if (tiop == NULL) 2134181111Sdes tiop = get_saved_tio(); 2135181111Sdes tty_make_modes(-1, tiop); 2136137015Sdes packet_send(); 2137137015Sdes /* XXX wait for reply */ 2138146998Sdes c->client_tty = 1; 2139137015Sdes } 2140137015Sdes 2141137015Sdes /* Transfer any environment variables from client to server */ 2142137015Sdes if (options.num_send_env != 0 && env != NULL) { 2143137015Sdes int i, j, matched; 2144137015Sdes char *name, *val; 2145137015Sdes 2146137015Sdes debug("Sending environment."); 2147137015Sdes for (i = 0; env[i] != NULL; i++) { 2148137015Sdes /* Split */ 2149137015Sdes name = xstrdup(env[i]); 2150137015Sdes if ((val = strchr(name, '=')) == NULL) { 2151263970Sdes free(name); 2152137015Sdes continue; 2153137015Sdes } 2154137015Sdes *val++ = '\0'; 2155137015Sdes 2156137015Sdes matched = 0; 2157137015Sdes for (j = 0; j < options.num_send_env; j++) { 2158137015Sdes if (match_pattern(name, options.send_env[j])) { 2159137015Sdes matched = 1; 2160137015Sdes break; 2161137015Sdes } 2162137015Sdes } 2163137015Sdes if (!matched) { 2164137015Sdes debug3("Ignored env %s", name); 2165263970Sdes free(name); 2166137015Sdes continue; 2167137015Sdes } 2168137015Sdes 2169137015Sdes debug("Sending env %s = %s", name, val); 2170137015Sdes channel_request_start(id, "env", 0); 2171137015Sdes packet_put_cstring(name); 2172137015Sdes packet_put_cstring(val); 2173137015Sdes packet_send(); 2174263970Sdes free(name); 2175137015Sdes } 2176137015Sdes } 2177137015Sdes 2178137015Sdes len = buffer_len(cmd); 2179137015Sdes if (len > 0) { 2180137015Sdes if (len > 900) 2181137015Sdes len = 900; 2182137015Sdes if (want_subsystem) { 2183181111Sdes debug("Sending subsystem: %.*s", 2184181111Sdes len, (u_char*)buffer_ptr(cmd)); 2185181111Sdes channel_request_start(id, "subsystem", 1); 2186247485Sdes client_expect_confirm(id, "subsystem", CONFIRM_CLOSE); 2187137015Sdes } else { 2188181111Sdes debug("Sending command: %.*s", 2189181111Sdes len, (u_char*)buffer_ptr(cmd)); 2190181111Sdes channel_request_start(id, "exec", 1); 2191247485Sdes client_expect_confirm(id, "exec", CONFIRM_CLOSE); 2192137015Sdes } 2193137015Sdes packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); 2194137015Sdes packet_send(); 2195137015Sdes } else { 2196181111Sdes channel_request_start(id, "shell", 1); 2197247485Sdes client_expect_confirm(id, "shell", CONFIRM_CLOSE); 2198137015Sdes packet_send(); 2199137015Sdes } 2200137015Sdes} 2201137015Sdes 220292555Sdesstatic void 220376259Sgreenclient_init_dispatch_20(void) 220460573Skris{ 220560573Skris dispatch_init(&dispatch_protocol_error); 220698675Sdes 220760573Skris dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); 220860573Skris dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); 220960573Skris dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); 221060573Skris dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); 221160573Skris dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); 221260573Skris dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 221360573Skris dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 221476259Sgreen dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); 221560573Skris dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); 2216181111Sdes dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm); 2217181111Sdes dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm); 221892555Sdes dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); 221976259Sgreen 222076259Sgreen /* rekeying */ 222176259Sgreen dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); 222298675Sdes 222398675Sdes /* global request reply messages */ 222498675Sdes dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); 222598675Sdes dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); 222660573Skris} 2227181111Sdes 222892555Sdesstatic void 222976259Sgreenclient_init_dispatch_13(void) 223060573Skris{ 223160573Skris dispatch_init(NULL); 223260573Skris dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); 223360573Skris dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); 223460573Skris dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); 223560573Skris dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 223660573Skris dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 223760573Skris dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); 223860573Skris dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); 223960573Skris dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); 224060573Skris dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); 224168700Sgreen 224268700Sgreen dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? 2243126274Sdes &client_input_agent_open : &deny_input_open); 224468700Sgreen dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? 224569587Sgreen &x11_input_open : &deny_input_open); 224660573Skris} 2247181111Sdes 224892555Sdesstatic void 224976259Sgreenclient_init_dispatch_15(void) 225060573Skris{ 225160573Skris client_init_dispatch_13(); 225260573Skris dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); 225360573Skris dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); 225460573Skris} 2255181111Sdes 225692555Sdesstatic void 225776259Sgreenclient_init_dispatch(void) 225860573Skris{ 225960573Skris if (compat20) 226060573Skris client_init_dispatch_20(); 226160573Skris else if (compat13) 226260573Skris client_init_dispatch_13(); 226360573Skris else 226460573Skris client_init_dispatch_15(); 226560573Skris} 2266126274Sdes 2267247485Sdesvoid 2268247485Sdesclient_stop_mux(void) 2269247485Sdes{ 2270247485Sdes if (options.control_path != NULL && muxserver_sock != -1) 2271247485Sdes unlink(options.control_path); 2272247485Sdes /* 2273251135Sdes * If we are in persist mode, or don't have a shell, signal that we 2274251135Sdes * should close when all active channels are closed. 2275247485Sdes */ 2276251135Sdes if (options.control_persist || no_shell_flag) { 2277247485Sdes session_closed = 1; 2278247485Sdes setproctitle("[stopped mux]"); 2279247485Sdes } 2280247485Sdes} 2281247485Sdes 2282126274Sdes/* client specific fatal cleanup */ 2283126274Sdesvoid 2284126274Sdescleanup_exit(int i) 2285126274Sdes{ 2286247485Sdes leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 2287126274Sdes leave_non_blocking(); 2288181111Sdes if (options.control_path != NULL && muxserver_sock != -1) 2289137015Sdes unlink(options.control_path); 2290221420Sdes ssh_kill_proxy_command(); 2291126274Sdes _exit(i); 2292126274Sdes} 2293