Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.126
1.1 deraadt 1: /*
1.12 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.33 deraadt 5: * The main loop for the interactive session (client side).
1.20 markus 6: *
1.33 deraadt 7: * As far as I am concerned, the code I have written for this software
8: * can be used freely for any purpose. Any derived versions of this
9: * software must be clearly marked as such, and if the derived work is
10: * incompatible with the protocol description in the RFC file, it must be
11: * called by a name other than "ssh" or "Secure Shell".
12: *
13: *
14: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 35: *
36: *
1.33 deraadt 37: * SSH2 support added by Markus Friedl.
1.78 markus 38: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 39: *
1.33 deraadt 40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
50: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
51: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
53: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
54: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
55: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
56: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
57: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
58: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 59: */
1.1 deraadt 60:
61: #include "includes.h"
1.126 ! djm 62: RCSID("$OpenBSD: clientloop.c,v 1.125 2004/06/15 05:45:04 djm Exp $");
1.1 deraadt 63:
1.45 markus 64: #include "ssh.h"
65: #include "ssh1.h"
66: #include "ssh2.h"
1.1 deraadt 67: #include "xmalloc.h"
68: #include "packet.h"
69: #include "buffer.h"
1.15 markus 70: #include "compat.h"
1.74 markus 71: #include "channels.h"
1.15 markus 72: #include "dispatch.h"
1.30 markus 73: #include "buffer.h"
74: #include "bufaux.h"
1.40 markus 75: #include "key.h"
1.54 markus 76: #include "kex.h"
1.45 markus 77: #include "log.h"
78: #include "readconf.h"
79: #include "clientloop.h"
1.40 markus 80: #include "authfd.h"
1.45 markus 81: #include "atomicio.h"
1.118 deraadt 82: #include "sshpty.h"
1.63 markus 83: #include "misc.h"
1.123 djm 84: #include "monitor_fdpass.h"
85: #include "match.h"
86: #include "msg.h"
1.39 markus 87:
88: /* import options */
89: extern Options options;
90:
1.1 deraadt 91: /* Flag indicating that stdin should be redirected from /dev/null. */
92: extern int stdin_null_flag;
93:
1.116 dtucker 94: /* Flag indicating that no shell has been requested */
95: extern int no_shell_flag;
96:
1.123 djm 97: /* Control socket */
98: extern int control_fd;
99:
1.13 markus 100: /*
101: * Name of the host we are connecting to. This is the name given on the
102: * command line, or the HostName specified for the user-supplied name in a
103: * configuration file.
104: */
1.1 deraadt 105: extern char *host;
106:
1.13 markus 107: /*
108: * Flag to indicate that we have received a window change signal which has
109: * not yet been processed. This will cause a message indicating the new
110: * window size to be sent to the server a little later. This is volatile
111: * because this is updated in a signal handler.
112: */
1.88 markus 113: static volatile sig_atomic_t received_window_change_signal = 0;
114: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 115:
116: /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
117: static int in_non_blocking_mode = 0;
118:
119: /* Common data for the client loop code. */
1.31 markus 120: static int quit_pending; /* Set to non-zero to quit the client loop. */
121: static int escape_char; /* Escape character. */
1.11 markus 122: static int escape_pending; /* Last character was the escape character */
123: static int last_was_cr; /* Last character was a newline. */
124: static int exit_status; /* Used to store the exit status of the command. */
125: static int stdin_eof; /* EOF has been encountered on standard error. */
126: static Buffer stdin_buffer; /* Buffer for stdin data. */
127: static Buffer stdout_buffer; /* Buffer for stdout data. */
128: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 129: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
130: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 131: static int connection_in; /* Connection to server (input). */
132: static int connection_out; /* Connection to server (output). */
1.56 markus 133: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 134: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 135: static int server_alive_timeouts = 0;
1.1 deraadt 136:
1.77 itojun 137: static void client_init_dispatch(void);
1.16 markus 138: int session_ident = -1;
139:
1.123 djm 140: struct confirm_ctx {
141: int want_tty;
142: int want_subsys;
143: Buffer cmd;
144: char *term;
145: struct termios tio;
1.126 ! djm 146: char **env;
1.123 djm 147: };
148:
1.54 markus 149: /*XXX*/
150: extern Kex *xxx_kex;
151:
1.123 djm 152: void ssh_process_session2_setup(int, int, int, Buffer *);
153:
1.1 deraadt 154: /* Restores stdin to blocking mode. */
155:
1.77 itojun 156: static void
1.49 itojun 157: leave_non_blocking(void)
1.1 deraadt 158: {
1.11 markus 159: if (in_non_blocking_mode) {
1.125 djm 160: unset_nonblock(fileno(stdin));
1.11 markus 161: in_non_blocking_mode = 0;
162: }
1.1 deraadt 163: }
164:
1.11 markus 165: /* Puts stdin terminal in non-blocking mode. */
166:
1.77 itojun 167: static void
1.49 itojun 168: enter_non_blocking(void)
1.1 deraadt 169: {
1.11 markus 170: in_non_blocking_mode = 1;
1.124 djm 171: set_nonblock(fileno(stdin));
1.1 deraadt 172: }
173:
1.13 markus 174: /*
175: * Signal handler for the window change signal (SIGWINCH). This just sets a
176: * flag indicating that the window has changed.
177: */
1.1 deraadt 178:
1.77 itojun 179: static void
1.11 markus 180: window_change_handler(int sig)
1.1 deraadt 181: {
1.11 markus 182: received_window_change_signal = 1;
183: signal(SIGWINCH, window_change_handler);
1.1 deraadt 184: }
185:
1.13 markus 186: /*
187: * Signal handler for signals that cause the program to terminate. These
188: * signals must be trapped to restore terminal modes.
189: */
1.1 deraadt 190:
1.77 itojun 191: static void
1.11 markus 192: signal_handler(int sig)
1.1 deraadt 193: {
1.75 markus 194: received_signal = sig;
195: quit_pending = 1;
1.1 deraadt 196: }
197:
1.13 markus 198: /*
199: * Returns current time in seconds from Jan 1, 1970 with the maximum
200: * available resolution.
201: */
1.1 deraadt 202:
1.77 itojun 203: static double
1.49 itojun 204: get_current_time(void)
1.1 deraadt 205: {
1.11 markus 206: struct timeval tv;
207: gettimeofday(&tv, NULL);
208: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.1 deraadt 209: }
210:
1.13 markus 211: /*
212: * This is called when the interactive is entered. This checks if there is
213: * an EOF coming on stdin. We must check this explicitly, as select() does
214: * not appear to wake up when redirecting from /dev/null.
215: */
1.1 deraadt 216:
1.77 itojun 217: static void
1.49 itojun 218: client_check_initial_eof_on_stdin(void)
1.1 deraadt 219: {
1.11 markus 220: int len;
221: char buf[1];
1.1 deraadt 222:
1.13 markus 223: /*
224: * If standard input is to be "redirected from /dev/null", we simply
225: * mark that we have seen an EOF and send an EOF message to the
226: * server. Otherwise, we try to read a single character; it appears
227: * that for some files, such /dev/null, select() never wakes up for
228: * read for this descriptor, which means that we never get EOF. This
229: * way we will get the EOF if stdin comes from /dev/null or similar.
230: */
1.11 markus 231: if (stdin_null_flag) {
232: /* Fake EOF on stdin. */
233: debug("Sending eof.");
234: stdin_eof = 1;
235: packet_start(SSH_CMSG_EOF);
236: packet_send();
237: } else {
238: enter_non_blocking();
239:
240: /* Check for immediate EOF on stdin. */
241: len = read(fileno(stdin), buf, 1);
242: if (len == 0) {
1.13 markus 243: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 244: debug("Sending eof.");
245: stdin_eof = 1;
246: packet_start(SSH_CMSG_EOF);
247: packet_send();
248: } else if (len > 0) {
1.13 markus 249: /*
250: * Got data. We must store the data in the buffer,
251: * and also process it as an escape character if
252: * appropriate.
253: */
1.42 markus 254: if ((u_char) buf[0] == escape_char)
1.11 markus 255: escape_pending = 1;
1.52 markus 256: else
1.11 markus 257: buffer_append(&stdin_buffer, buf, 1);
258: }
259: leave_non_blocking();
260: }
1.1 deraadt 261: }
262:
263:
1.13 markus 264: /*
265: * Make packets from buffered stdin data, and buffer them for sending to the
266: * connection.
267: */
1.1 deraadt 268:
1.77 itojun 269: static void
1.49 itojun 270: client_make_packets_from_stdin_data(void)
1.1 deraadt 271: {
1.42 markus 272: u_int len;
1.1 deraadt 273:
1.11 markus 274: /* Send buffered stdin data to the server. */
275: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 276: packet_not_very_much_data_to_write()) {
1.11 markus 277: len = buffer_len(&stdin_buffer);
278: /* Keep the packets at reasonable size. */
279: if (len > packet_get_maxsize())
280: len = packet_get_maxsize();
281: packet_start(SSH_CMSG_STDIN_DATA);
282: packet_put_string(buffer_ptr(&stdin_buffer), len);
283: packet_send();
284: buffer_consume(&stdin_buffer, len);
1.52 markus 285: stdin_bytes += len;
1.11 markus 286: /* If we have a pending EOF, send it now. */
287: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
288: packet_start(SSH_CMSG_EOF);
289: packet_send();
290: }
1.1 deraadt 291: }
292: }
293:
1.13 markus 294: /*
295: * Checks if the client window has changed, and sends a packet about it to
296: * the server if so. The actual change is detected elsewhere (by a software
297: * interrupt on Unix); this just checks the flag and sends a message if
298: * appropriate.
299: */
1.1 deraadt 300:
1.77 itojun 301: static void
1.49 itojun 302: client_check_window_change(void)
1.1 deraadt 303: {
1.16 markus 304: struct winsize ws;
305:
306: if (! received_window_change_signal)
307: return;
308: /** XXX race */
309: received_window_change_signal = 0;
310:
1.37 markus 311: debug2("client_check_window_change: changed");
1.16 markus 312:
313: if (compat20) {
1.123 djm 314: channel_send_window_changes();
1.16 markus 315: } else {
1.123 djm 316: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
317: return;
1.16 markus 318: packet_start(SSH_CMSG_WINDOW_SIZE);
319: packet_put_int(ws.ws_row);
320: packet_put_int(ws.ws_col);
321: packet_put_int(ws.ws_xpixel);
322: packet_put_int(ws.ws_ypixel);
323: packet_send();
1.1 deraadt 324: }
325: }
326:
1.117 markus 327: static void
328: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
329: {
330: server_alive_timeouts = 0;
331: client_global_request_reply_fwd(type, seq, ctxt);
332: }
333:
334: static void
335: server_alive_check(void)
336: {
337: if (++server_alive_timeouts > options.server_alive_count_max)
338: packet_disconnect("Timeout, server not responding.");
339: packet_start(SSH2_MSG_GLOBAL_REQUEST);
340: packet_put_cstring("keepalive@openssh.com");
341: packet_put_char(1); /* boolean: want reply */
342: packet_send();
343: }
344:
1.13 markus 345: /*
346: * Waits until the client can do something (some data becomes available on
347: * one of the file descriptors).
348: */
1.77 itojun 349: static void
1.46 markus 350: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.81 markus 351: int *maxfdp, int *nallocp, int rekeying)
1.11 markus 352: {
1.117 markus 353: struct timeval tv, *tvp;
354: int ret;
355:
1.46 markus 356: /* Add any selections by the channel mechanism. */
1.81 markus 357: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 358:
1.16 markus 359: if (!compat20) {
1.17 markus 360: /* Read from the connection, unless our buffers are full. */
1.16 markus 361: if (buffer_len(&stdout_buffer) < buffer_high &&
362: buffer_len(&stderr_buffer) < buffer_high &&
363: channel_not_very_much_buffered_data())
1.46 markus 364: FD_SET(connection_in, *readsetp);
1.17 markus 365: /*
366: * Read from stdin, unless we have seen EOF or have very much
367: * buffered data to send to the server.
368: */
369: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 370: FD_SET(fileno(stdin), *readsetp);
1.17 markus 371:
372: /* Select stdout/stderr if have data in buffer. */
373: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 374: FD_SET(fileno(stdout), *writesetp);
1.17 markus 375: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 376: FD_SET(fileno(stderr), *writesetp);
1.16 markus 377: } else {
1.71 markus 378: /* channel_prepare_select could have closed the last channel */
1.84 markus 379: if (session_closed && !channel_still_open() &&
380: !packet_have_data_to_write()) {
381: /* clear mask since we did not call select() */
1.87 markus 382: memset(*readsetp, 0, *nallocp);
383: memset(*writesetp, 0, *nallocp);
1.84 markus 384: return;
1.71 markus 385: } else {
386: FD_SET(connection_in, *readsetp);
387: }
1.16 markus 388: }
1.11 markus 389:
390: /* Select server connection if have data to write to the server. */
391: if (packet_have_data_to_write())
1.46 markus 392: FD_SET(connection_out, *writesetp);
1.11 markus 393:
1.123 djm 394: if (control_fd != -1)
395: FD_SET(control_fd, *readsetp);
396:
1.13 markus 397: /*
398: * Wait for something to happen. This will suspend the process until
399: * some selected descriptor can be read, written, or has some other
1.117 markus 400: * event pending.
1.13 markus 401: */
1.11 markus 402:
1.117 markus 403: if (options.server_alive_interval == 0 || !compat20)
404: tvp = NULL;
405: else {
406: tv.tv_sec = options.server_alive_interval;
407: tv.tv_usec = 0;
408: tvp = &tv;
409: }
410: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
411: if (ret < 0) {
1.11 markus 412: char buf[100];
1.51 markus 413:
414: /*
415: * We have to clear the select masks, because we return.
416: * We have to return, because the mainloop checks for the flags
417: * set by the signal handlers.
418: */
1.87 markus 419: memset(*readsetp, 0, *nallocp);
420: memset(*writesetp, 0, *nallocp);
1.50 deraadt 421:
1.11 markus 422: if (errno == EINTR)
423: return;
424: /* Note: we might still have data in the buffers. */
425: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
426: buffer_append(&stderr_buffer, buf, strlen(buf));
427: quit_pending = 1;
1.117 markus 428: } else if (ret == 0)
429: server_alive_check();
1.11 markus 430: }
431:
1.77 itojun 432: static void
1.31 markus 433: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 434: {
1.11 markus 435: struct winsize oldws, newws;
436:
437: /* Flush stdout and stderr buffers. */
1.31 markus 438: if (buffer_len(bout) > 0)
1.112 deraadt 439: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 440: if (buffer_len(berr) > 0)
1.112 deraadt 441: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 442:
443: leave_raw_mode();
444:
1.13 markus 445: /*
446: * Free (and clear) the buffer to reduce the amount of data that gets
447: * written to swap.
448: */
1.31 markus 449: buffer_free(bin);
450: buffer_free(bout);
451: buffer_free(berr);
1.11 markus 452:
453: /* Save old window size. */
454: ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
455:
456: /* Send the suspend signal to the program itself. */
457: kill(getpid(), SIGTSTP);
458:
459: /* Check if the window size has changed. */
460: if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
461: (oldws.ws_row != newws.ws_row ||
1.90 deraadt 462: oldws.ws_col != newws.ws_col ||
463: oldws.ws_xpixel != newws.ws_xpixel ||
464: oldws.ws_ypixel != newws.ws_ypixel))
1.11 markus 465: received_window_change_signal = 1;
466:
467: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 468: buffer_init(bin);
469: buffer_init(bout);
470: buffer_init(berr);
1.11 markus 471:
472: enter_raw_mode();
473: }
474:
1.77 itojun 475: static void
1.17 markus 476: client_process_net_input(fd_set * readset)
1.11 markus 477: {
1.17 markus 478: int len;
479: char buf[8192];
1.11 markus 480:
1.13 markus 481: /*
482: * Read input from the server, and add any such data to the buffer of
483: * the packet subsystem.
484: */
1.11 markus 485: if (FD_ISSET(connection_in, readset)) {
486: /* Read as much as possible. */
487: len = read(connection_in, buf, sizeof(buf));
488: if (len == 0) {
489: /* Received EOF. The remote host has closed the connection. */
490: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
491: host);
1.1 deraadt 492: buffer_append(&stderr_buffer, buf, strlen(buf));
493: quit_pending = 1;
494: return;
1.11 markus 495: }
1.13 markus 496: /*
497: * There is a kernel bug on Solaris that causes select to
498: * sometimes wake up even though there is no data available.
499: */
1.53 millert 500: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 501: len = 0;
502:
503: if (len < 0) {
504: /* An error has encountered. Perhaps there is a network problem. */
505: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
506: host, strerror(errno));
507: buffer_append(&stderr_buffer, buf, strlen(buf));
508: quit_pending = 1;
509: return;
510: }
511: packet_process_incoming(buf, len);
512: }
1.17 markus 513: }
1.16 markus 514:
1.97 jakob 515: static void
1.123 djm 516: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
517: {
518: int id;
519: Channel *c;
520:
521: id = packet_get_int();
522: packet_check_eom();
523:
524: if ((c = channel_lookup(id)) == NULL) {
525: error("%s: no channel for id %d", __func__, id);
526: return;
527: }
528:
529: if (type == SSH2_MSG_CHANNEL_SUCCESS)
530: debug2("Request suceeded on channel %d", id);
531: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
532: error("Request failed on channel %d", id);
533: channel_free(c);
534: }
535: }
536:
537: static void
538: client_extra_session2_setup(int id, void *arg)
539: {
540: struct confirm_ctx *cctx = arg;
541: Channel *c;
1.126 ! djm 542: int i;
1.123 djm 543:
544: if (cctx == NULL)
545: fatal("%s: cctx == NULL", __func__);
546: if ((c = channel_lookup(id)) == NULL)
547: fatal("%s: no channel for id %d", __func__, id);
548:
549: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 ! djm 550: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 551: client_subsystem_reply);
552:
553: c->confirm_ctx = NULL;
554: buffer_free(&cctx->cmd);
1.126 ! djm 555: xfree(cctx->term);
! 556: if (cctx->env != NULL) {
! 557: for (i = 0; cctx->env[i] != NULL; i++)
! 558: xfree(cctx->env[i]);
! 559: xfree(cctx->env);
! 560: }
! 561: xfree(cctx);
1.123 djm 562: }
563:
564: static void
565: client_process_control(fd_set * readset)
566: {
567: Buffer m;
568: Channel *c;
1.126 ! djm 569: int client_fd, new_fd[3], ver, i;
1.123 djm 570: socklen_t addrlen;
571: struct sockaddr_storage addr;
572: struct confirm_ctx *cctx;
573: char *cmd;
1.126 ! djm 574: u_int len, env_len;
1.123 djm 575: uid_t euid;
576: gid_t egid;
577:
578: /*
579: * Accept connection on control socket
580: */
581: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
582: return;
583:
584: memset(&addr, 0, sizeof(addr));
585: addrlen = sizeof(addr);
586: if ((client_fd = accept(control_fd,
587: (struct sockaddr*)&addr, &addrlen)) == -1) {
588: error("%s accept: %s", __func__, strerror(errno));
589: return;
590: }
591:
592: if (getpeereid(client_fd, &euid, &egid) < 0) {
593: error("%s getpeereid failed: %s", __func__, strerror(errno));
594: close(client_fd);
595: return;
596: }
597: if ((euid != 0) && (getuid() != euid)) {
598: error("control mode uid mismatch: peer euid %u != uid %u",
599: (u_int) euid, (u_int) getuid());
600: close(client_fd);
601: return;
602: }
603: /* XXX: implement use of ssh-askpass to confirm additional channels */
604:
605: unset_nonblock(client_fd);
606:
607: buffer_init(&m);
608:
609: buffer_put_int(&m, getpid());
610: if (ssh_msg_send(client_fd, /* version */0, &m) == -1) {
611: error("%s: client msg_send failed", __func__);
612: close(client_fd);
613: return;
614: }
615: buffer_clear(&m);
616:
617: if (ssh_msg_recv(client_fd, &m) == -1) {
618: error("%s: client msg_recv failed", __func__);
619: close(client_fd);
620: return;
621: }
622:
623: if ((ver = buffer_get_char(&m)) != 0) {
624: error("%s: wrong client version %d", __func__, ver);
625: buffer_free(&m);
626: close(client_fd);
627: return;
628: }
629:
630: cctx = xmalloc(sizeof(*cctx));
631: memset(cctx, 0, sizeof(*cctx));
632:
633: cctx->want_tty = buffer_get_int(&m);
634: cctx->want_subsys = buffer_get_int(&m);
635: cctx->term = buffer_get_string(&m, &len);
636:
637: cmd = buffer_get_string(&m, &len);
638: buffer_init(&cctx->cmd);
639: buffer_append(&cctx->cmd, cmd, strlen(cmd));
640:
1.126 ! djm 641: env_len = buffer_get_int(&m);
! 642: env_len = MIN(env_len, 4096);
! 643: debug3("%s: receiving %d env vars", __func__, env_len);
! 644: if (env_len != 0) {
! 645: cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
! 646: for (i = 0; i < env_len; i++)
! 647: cctx->env[i] = buffer_get_string(&m, &len);
! 648: cctx->env[i] = NULL;
! 649: }
! 650:
1.123 djm 651: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
652: cctx->want_tty, cctx->want_subsys, cmd);
653:
654: /* Gather fds from client */
655: new_fd[0] = mm_receive_fd(client_fd);
656: new_fd[1] = mm_receive_fd(client_fd);
657: new_fd[2] = mm_receive_fd(client_fd);
658:
659: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
660: new_fd[0], new_fd[1], new_fd[2]);
661:
662: /* Try to pick up ttymodes from client before it goes raw */
663: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
664: error("%s: tcgetattr: %s", __func__, strerror(errno));
665:
666: buffer_clear(&m);
667: if (ssh_msg_send(client_fd, /* version */0, &m) == -1) {
668: error("%s: client msg_send failed", __func__);
669: close(client_fd);
670: close(new_fd[0]);
671: close(new_fd[1]);
672: close(new_fd[2]);
673: return;
674: }
675: buffer_free(&m);
676:
677: /* enable nonblocking unless tty */
678: if (!isatty(new_fd[0]))
679: set_nonblock(new_fd[0]);
680: if (!isatty(new_fd[1]))
681: set_nonblock(new_fd[1]);
682: if (!isatty(new_fd[2]))
683: set_nonblock(new_fd[2]);
684:
685: set_nonblock(client_fd);
686:
687: c = channel_new("session", SSH_CHANNEL_OPENING,
688: new_fd[0], new_fd[1], new_fd[2],
689: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
690: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
691:
692: /* XXX */
693: c->ctl_fd = client_fd;
694:
695: debug3("%s: channel_new: %d", __func__, c->self);
696:
697: channel_send_open(c->self);
698: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
699: }
700:
701: static void
1.99 markus 702: process_cmdline(void)
1.97 jakob 703: {
704: void (*handler)(int);
705: char *s, *cmd;
706: u_short fwd_port, fwd_host_port;
707: char buf[1024], sfwd_port[6], sfwd_host_port[6];
1.121 djm 708: int delete = 0;
1.97 jakob 709: int local = 0;
710:
711: leave_raw_mode();
1.101 markus 712: handler = signal(SIGINT, SIG_IGN);
1.99 markus 713: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 714: if (s == NULL)
715: goto out;
716: while (*s && isspace(*s))
717: s++;
1.121 djm 718: if (*s == '-')
719: s++; /* Skip cmdline '-', if any */
1.120 dtucker 720: if (*s == '\0')
1.97 jakob 721: goto out;
1.121 djm 722:
1.122 djm 723: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 724: logit("Commands:");
725: logit(" -Lport:host:hostport Request local forward");
726: logit(" -Rport:host:hostport Request remote forward");
727: logit(" -KRhostport Cancel remote forward");
728: goto out;
729: }
730:
731: if (*s == 'K') {
732: delete = 1;
733: s++;
734: }
735: if (*s != 'L' && *s != 'R') {
1.109 itojun 736: logit("Invalid command.");
1.97 jakob 737: goto out;
738: }
1.121 djm 739: if (*s == 'L')
1.97 jakob 740: local = 1;
1.121 djm 741: if (local && delete) {
742: logit("Not supported.");
743: goto out;
744: }
745: if ((!local || delete) && !compat20) {
1.109 itojun 746: logit("Not supported for SSH protocol version 1.");
1.97 jakob 747: goto out;
748: }
1.121 djm 749:
750: s++;
1.97 jakob 751: while (*s && isspace(*s))
752: s++;
753:
1.121 djm 754: if (delete) {
755: if (sscanf(s, "%5[0-9]", sfwd_host_port) != 1) {
756: logit("Bad forwarding specification.");
757: goto out;
758: }
759: if ((fwd_host_port = a2port(sfwd_host_port)) == 0) {
760: logit("Bad forwarding port(s).");
761: goto out;
762: }
763: channel_request_rforward_cancel(fwd_host_port);
764: } else {
765: if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]",
766: sfwd_port, buf, sfwd_host_port) != 3 &&
767: sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]",
768: sfwd_port, buf, sfwd_host_port) != 3) {
769: logit("Bad forwarding specification.");
770: goto out;
771: }
772: if ((fwd_port = a2port(sfwd_port)) == 0 ||
773: (fwd_host_port = a2port(sfwd_host_port)) == 0) {
774: logit("Bad forwarding port(s).");
1.97 jakob 775: goto out;
776: }
1.121 djm 777: if (local) {
778: if (channel_setup_local_fwd_listener(fwd_port, buf,
779: fwd_host_port, options.gateway_ports) < 0) {
780: logit("Port forwarding failed.");
781: goto out;
782: }
783: } else
784: channel_request_remote_forwarding(fwd_port, buf,
785: fwd_host_port);
786: logit("Forwarding port.");
787: }
788:
1.97 jakob 789: out:
790: signal(SIGINT, handler);
791: enter_raw_mode();
792: if (cmd)
793: xfree(cmd);
794: }
795:
1.31 markus 796: /* process the characters one by one */
1.77 itojun 797: static int
1.31 markus 798: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
799: {
1.32 markus 800: char string[1024];
1.31 markus 801: pid_t pid;
802: int bytes = 0;
1.42 markus 803: u_int i;
804: u_char ch;
1.31 markus 805: char *s;
806:
807: for (i = 0; i < len; i++) {
808: /* Get one character at a time. */
809: ch = buf[i];
810:
811: if (escape_pending) {
812: /* We have previously seen an escape character. */
813: /* Clear the flag now. */
814: escape_pending = 0;
815:
816: /* Process the escaped character. */
817: switch (ch) {
818: case '.':
819: /* Terminate the connection. */
1.32 markus 820: snprintf(string, sizeof string, "%c.\r\n", escape_char);
821: buffer_append(berr, string, strlen(string));
1.31 markus 822:
823: quit_pending = 1;
824: return -1;
825:
826: case 'Z' - 64:
827: /* Suspend the program. */
828: /* Print a message to that effect to the user. */
1.32 markus 829: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
830: buffer_append(berr, string, strlen(string));
1.31 markus 831:
832: /* Restore terminal modes and suspend. */
833: client_suspend_self(bin, bout, berr);
834:
835: /* We have been continued. */
836: continue;
837:
1.111 markus 838: case 'B':
839: if (compat20) {
840: snprintf(string, sizeof string,
841: "%cB\r\n", escape_char);
842: buffer_append(berr, string,
843: strlen(string));
844: channel_request_start(session_ident,
845: "break", 0);
846: packet_put_int(1000);
847: packet_send();
848: }
849: continue;
850:
1.54 markus 851: case 'R':
1.59 markus 852: if (compat20) {
853: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 854: logit("Server does not support re-keying");
1.59 markus 855: else
856: need_rekeying = 1;
857: }
1.54 markus 858: continue;
859:
1.31 markus 860: case '&':
861: /*
862: * Detach the program (continue to serve connections,
863: * but put in background and no more new connections).
864: */
865: /* Restore tty modes. */
866: leave_raw_mode();
867:
868: /* Stop listening for new connections. */
1.86 markus 869: channel_stop_listening();
1.31 markus 870:
1.86 markus 871: snprintf(string, sizeof string,
872: "%c& [backgrounded]\n", escape_char);
873: buffer_append(berr, string, strlen(string));
1.31 markus 874:
875: /* Fork into background. */
876: pid = fork();
877: if (pid < 0) {
878: error("fork: %.100s", strerror(errno));
879: continue;
880: }
881: if (pid != 0) { /* This is the parent. */
882: /* The parent just exits. */
883: exit(0);
884: }
885: /* The child continues serving connections. */
1.86 markus 886: if (compat20) {
887: buffer_append(bin, "\004", 1);
888: /* fake EOF on stdin */
889: return -1;
890: } else if (!stdin_eof) {
891: /*
892: * Sending SSH_CMSG_EOF alone does not always appear
893: * to be enough. So we try to send an EOF character
894: * first.
895: */
896: packet_start(SSH_CMSG_STDIN_DATA);
897: packet_put_string("\004", 1);
898: packet_send();
899: /* Close stdin. */
900: stdin_eof = 1;
901: if (buffer_len(bin) == 0) {
902: packet_start(SSH_CMSG_EOF);
903: packet_send();
904: }
905: }
906: continue;
1.31 markus 907:
908: case '?':
1.32 markus 909: snprintf(string, sizeof string,
1.31 markus 910: "%c?\r\n\
911: Supported escape sequences:\r\n\
1.104 stevesk 912: %c. - terminate connection\r\n\
1.111 markus 913: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 914: %cC - open a command line\r\n\
915: %cR - Request rekey (SSH protocol 2 only)\r\n\
916: %c^Z - suspend ssh\r\n\
917: %c# - list forwarded connections\r\n\
918: %c& - background ssh (when waiting for connections to terminate)\r\n\
919: %c? - this message\r\n\
920: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 921: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 922: escape_char, escape_char, escape_char, escape_char,
923: escape_char, escape_char, escape_char, escape_char,
1.111 markus 924: escape_char, escape_char, escape_char);
1.32 markus 925: buffer_append(berr, string, strlen(string));
1.31 markus 926: continue;
927:
928: case '#':
1.32 markus 929: snprintf(string, sizeof string, "%c#\r\n", escape_char);
930: buffer_append(berr, string, strlen(string));
1.31 markus 931: s = channel_open_message();
932: buffer_append(berr, s, strlen(s));
933: xfree(s);
1.97 jakob 934: continue;
935:
936: case 'C':
1.99 markus 937: process_cmdline();
1.31 markus 938: continue;
939:
940: default:
941: if (ch != escape_char) {
942: buffer_put_char(bin, escape_char);
943: bytes++;
944: }
945: /* Escaped characters fall through here */
946: break;
947: }
948: } else {
949: /*
950: * The previous character was not an escape char. Check if this
951: * is an escape.
952: */
953: if (last_was_cr && ch == escape_char) {
954: /* It is. Set the flag and continue to next character. */
955: escape_pending = 1;
956: continue;
957: }
958: }
959:
960: /*
961: * Normal character. Record whether it was a newline,
962: * and append it to the buffer.
963: */
964: last_was_cr = (ch == '\r' || ch == '\n');
965: buffer_put_char(bin, ch);
966: bytes++;
967: }
968: return bytes;
969: }
970:
1.77 itojun 971: static void
1.17 markus 972: client_process_input(fd_set * readset)
973: {
1.21 deraadt 974: int len;
1.31 markus 975: char buf[8192];
1.16 markus 976:
1.11 markus 977: /* Read input from stdin. */
978: if (FD_ISSET(fileno(stdin), readset)) {
979: /* Read as much as possible. */
980: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 981: if (len < 0 && (errno == EAGAIN || errno == EINTR))
982: return; /* we'll try again later */
1.11 markus 983: if (len <= 0) {
1.13 markus 984: /*
985: * Received EOF or error. They are treated
986: * similarly, except that an error message is printed
987: * if it was an error condition.
988: */
1.11 markus 989: if (len < 0) {
990: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
991: buffer_append(&stderr_buffer, buf, strlen(buf));
992: }
993: /* Mark that we have seen EOF. */
994: stdin_eof = 1;
1.13 markus 995: /*
996: * Send an EOF message to the server unless there is
997: * data in the buffer. If there is data in the
998: * buffer, no message will be sent now. Code
999: * elsewhere will send the EOF when the buffer
1000: * becomes empty if stdin_eof is set.
1001: */
1.11 markus 1002: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1003: packet_start(SSH_CMSG_EOF);
1004: packet_send();
1.11 markus 1005: }
1.72 stevesk 1006: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1007: /*
1008: * Normal successful read, and no escape character.
1009: * Just append the data to buffer.
1010: */
1.11 markus 1011: buffer_append(&stdin_buffer, buf, len);
1012: } else {
1.13 markus 1013: /*
1014: * Normal, successful read. But we have an escape character
1015: * and have to process the characters one by one.
1016: */
1.52 markus 1017: if (process_escapes(&stdin_buffer, &stdout_buffer,
1018: &stderr_buffer, buf, len) == -1)
1.31 markus 1019: return;
1.11 markus 1020: }
1021: }
1022: }
1023:
1.77 itojun 1024: static void
1.11 markus 1025: client_process_output(fd_set * writeset)
1026: {
1027: int len;
1028: char buf[100];
1.1 deraadt 1029:
1.11 markus 1030: /* Write buffered output to stdout. */
1031: if (FD_ISSET(fileno(stdout), writeset)) {
1032: /* Write as much data as possible. */
1033: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1034: buffer_len(&stdout_buffer));
1.11 markus 1035: if (len <= 0) {
1.64 markus 1036: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1037: len = 0;
1038: else {
1.13 markus 1039: /*
1040: * An error or EOF was encountered. Put an
1041: * error message to stderr buffer.
1042: */
1.11 markus 1043: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1044: buffer_append(&stderr_buffer, buf, strlen(buf));
1045: quit_pending = 1;
1046: return;
1047: }
1048: }
1049: /* Consume printed data from the buffer. */
1050: buffer_consume(&stdout_buffer, len);
1.57 markus 1051: stdout_bytes += len;
1.11 markus 1052: }
1053: /* Write buffered output to stderr. */
1054: if (FD_ISSET(fileno(stderr), writeset)) {
1055: /* Write as much data as possible. */
1056: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1057: buffer_len(&stderr_buffer));
1.11 markus 1058: if (len <= 0) {
1.64 markus 1059: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1060: len = 0;
1061: else {
1.13 markus 1062: /* EOF or error, but can't even print error message. */
1.11 markus 1063: quit_pending = 1;
1064: return;
1065: }
1066: }
1067: /* Consume printed characters from the buffer. */
1068: buffer_consume(&stderr_buffer, len);
1.57 markus 1069: stderr_bytes += len;
1.11 markus 1070: }
1.1 deraadt 1071: }
1072:
1.13 markus 1073: /*
1.15 markus 1074: * Get packets from the connection input buffer, and process them as long as
1075: * there are packets available.
1076: *
1077: * Any unknown packets received during the actual
1078: * session cause the session to terminate. This is
1079: * intended to make debugging easier since no
1080: * confirmations are sent. Any compatible protocol
1081: * extensions must be negotiated during the
1082: * preparatory phase.
1083: */
1084:
1.77 itojun 1085: static void
1.49 itojun 1086: client_process_buffered_input_packets(void)
1.15 markus 1087: {
1.54 markus 1088: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1089: }
1090:
1.31 markus 1091: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1092:
1.77 itojun 1093: static int
1.31 markus 1094: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1095: {
1.31 markus 1096: /* XXX we assume c->extended is writeable */
1097: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1098: }
1099:
1.77 itojun 1100: static void
1.60 markus 1101: client_channel_closed(int id, void *arg)
1102: {
1.83 markus 1103: channel_cancel_cleanup(id);
1.60 markus 1104: session_closed = 1;
1.113 markus 1105: leave_raw_mode();
1.60 markus 1106: }
1107:
1.15 markus 1108: /*
1.13 markus 1109: * Implements the interactive session with the server. This is called after
1110: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1111: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1112: * used as an escape character for terminating or suspending the session.
1.13 markus 1113: */
1.1 deraadt 1114:
1.20 markus 1115: int
1.30 markus 1116: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1117: {
1.46 markus 1118: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1119: double start_time, total_time;
1.81 markus 1120: int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0;
1.11 markus 1121: char buf[100];
1122:
1123: debug("Entering interactive session.");
1124:
1125: start_time = get_current_time();
1126:
1127: /* Initialize variables. */
1128: escape_pending = 0;
1129: last_was_cr = 1;
1130: exit_status = -1;
1131: stdin_eof = 0;
1132: buffer_high = 64 * 1024;
1133: connection_in = packet_get_connection_in();
1134: connection_out = packet_get_connection_out();
1.46 markus 1135: max_fd = MAX(connection_in, connection_out);
1.123 djm 1136: if (control_fd != -1)
1137: max_fd = MAX(max_fd, control_fd);
1.46 markus 1138:
1139: if (!compat20) {
1.63 markus 1140: /* enable nonblocking unless tty */
1141: if (!isatty(fileno(stdin)))
1142: set_nonblock(fileno(stdin));
1143: if (!isatty(fileno(stdout)))
1144: set_nonblock(fileno(stdout));
1145: if (!isatty(fileno(stderr)))
1146: set_nonblock(fileno(stderr));
1.46 markus 1147: max_fd = MAX(max_fd, fileno(stdin));
1148: max_fd = MAX(max_fd, fileno(stdout));
1149: max_fd = MAX(max_fd, fileno(stderr));
1150: }
1.11 markus 1151: stdin_bytes = 0;
1152: stdout_bytes = 0;
1153: stderr_bytes = 0;
1154: quit_pending = 0;
1155: escape_char = escape_char_arg;
1156:
1157: /* Initialize buffers. */
1158: buffer_init(&stdin_buffer);
1159: buffer_init(&stdout_buffer);
1160: buffer_init(&stderr_buffer);
1161:
1.15 markus 1162: client_init_dispatch();
1163:
1.105 markus 1164: /*
1165: * Set signal handlers, (e.g. to restore non-blocking mode)
1166: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1167: */
1168: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1169: signal(SIGINT, signal_handler);
1170: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1171: signal(SIGQUIT, signal_handler);
1172: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1173: signal(SIGTERM, signal_handler);
1.11 markus 1174: if (have_pty)
1175: signal(SIGWINCH, window_change_handler);
1176:
1177: if (have_pty)
1178: enter_raw_mode();
1179:
1.48 markus 1180: if (compat20) {
1181: session_ident = ssh2_chan_id;
1.72 stevesk 1182: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1183: channel_register_filter(session_ident,
1184: simple_escape_filter);
1.60 markus 1185: if (session_ident != -1)
1186: channel_register_cleanup(session_ident,
1187: client_channel_closed);
1.48 markus 1188: } else {
1189: /* Check if we should immediately send eof on stdin. */
1.16 markus 1190: client_check_initial_eof_on_stdin();
1.48 markus 1191: }
1.30 markus 1192:
1.11 markus 1193: /* Main loop of the client for the interactive session mode. */
1194: while (!quit_pending) {
1195:
1.13 markus 1196: /* Process buffered packets sent by the server. */
1.11 markus 1197: client_process_buffered_input_packets();
1198:
1.60 markus 1199: if (compat20 && session_closed && !channel_still_open())
1200: break;
1201:
1.56 markus 1202: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1203:
1.56 markus 1204: if (rekeying) {
1205: debug("rekeying in progress");
1206: } else {
1207: /*
1208: * Make packets of buffered stdin data, and buffer
1209: * them for sending to the server.
1210: */
1211: if (!compat20)
1212: client_make_packets_from_stdin_data();
1.11 markus 1213:
1.56 markus 1214: /*
1215: * Make packets from buffered channel data, and
1216: * enqueue them for sending to the server.
1217: */
1218: if (packet_not_very_much_data_to_write())
1219: channel_output_poll();
1.11 markus 1220:
1.56 markus 1221: /*
1222: * Check if the window size has changed, and buffer a
1223: * message about it to the server if so.
1224: */
1225: client_check_window_change();
1.11 markus 1226:
1.56 markus 1227: if (quit_pending)
1228: break;
1229: }
1.13 markus 1230: /*
1231: * Wait until we have something to do (something becomes
1232: * available on one of the descriptors).
1233: */
1.81 markus 1234: max_fd2 = max_fd;
1.56 markus 1235: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1236: &max_fd2, &nalloc, rekeying);
1.11 markus 1237:
1238: if (quit_pending)
1239: break;
1240:
1.56 markus 1241: /* Do channel operations unless rekeying in progress. */
1242: if (!rekeying) {
1243: channel_after_select(readset, writeset);
1.108 markus 1244: if (need_rekeying || packet_need_rekeying()) {
1245: debug("need rekeying");
1.56 markus 1246: xxx_kex->done = 0;
1247: kex_send_kexinit(xxx_kex);
1248: need_rekeying = 0;
1249: }
1250: }
1.11 markus 1251:
1.17 markus 1252: /* Buffer input from the connection. */
1.46 markus 1253: client_process_net_input(readset);
1.17 markus 1254:
1.123 djm 1255: /* Accept control connections. */
1256: client_process_control(readset);
1257:
1.17 markus 1258: if (quit_pending)
1259: break;
1.11 markus 1260:
1.17 markus 1261: if (!compat20) {
1262: /* Buffer data from stdin */
1.46 markus 1263: client_process_input(readset);
1.17 markus 1264: /*
1265: * Process output to stdout and stderr. Output to
1266: * the connection is processed elsewhere (above).
1267: */
1.46 markus 1268: client_process_output(writeset);
1.17 markus 1269: }
1.11 markus 1270:
1.13 markus 1271: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1272: if (FD_ISSET(connection_out, writeset))
1.11 markus 1273: packet_write_poll();
1274: }
1.46 markus 1275: if (readset)
1276: xfree(readset);
1277: if (writeset)
1278: xfree(writeset);
1.11 markus 1279:
1280: /* Terminate the session. */
1281:
1282: /* Stop watching for window change. */
1283: if (have_pty)
1284: signal(SIGWINCH, SIG_DFL);
1285:
1.76 markus 1286: channel_free_all();
1.11 markus 1287:
1.75 markus 1288: if (have_pty)
1289: leave_raw_mode();
1290:
1291: /* restore blocking io */
1292: if (!isatty(fileno(stdin)))
1293: unset_nonblock(fileno(stdin));
1294: if (!isatty(fileno(stdout)))
1295: unset_nonblock(fileno(stdout));
1296: if (!isatty(fileno(stderr)))
1297: unset_nonblock(fileno(stderr));
1.116 dtucker 1298:
1299: /*
1300: * If there was no shell or command requested, there will be no remote
1301: * exit status to be returned. In that case, clear error code if the
1302: * connection was deliberately terminated at this end.
1303: */
1304: if (no_shell_flag && received_signal == SIGTERM) {
1305: received_signal = 0;
1306: exit_status = 0;
1307: }
1.75 markus 1308:
1.113 markus 1309: if (received_signal)
1.89 itojun 1310: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1311:
1.13 markus 1312: /*
1313: * In interactive mode (with pseudo tty) display a message indicating
1314: * that the connection has been closed.
1315: */
1.11 markus 1316: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1317: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1318: buffer_append(&stderr_buffer, buf, strlen(buf));
1319: }
1.70 markus 1320:
1.11 markus 1321: /* Output any buffered data for stdout. */
1.70 markus 1322: while (buffer_len(&stdout_buffer) > 0) {
1323: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1324: buffer_len(&stdout_buffer));
1.70 markus 1325: if (len <= 0) {
1.11 markus 1326: error("Write failed flushing stdout buffer.");
1.70 markus 1327: break;
1328: }
1.11 markus 1329: buffer_consume(&stdout_buffer, len);
1.57 markus 1330: stdout_bytes += len;
1.11 markus 1331: }
1332:
1333: /* Output any buffered data for stderr. */
1.70 markus 1334: while (buffer_len(&stderr_buffer) > 0) {
1335: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1336: buffer_len(&stderr_buffer));
1.70 markus 1337: if (len <= 0) {
1.11 markus 1338: error("Write failed flushing stderr buffer.");
1.70 markus 1339: break;
1340: }
1.11 markus 1341: buffer_consume(&stderr_buffer, len);
1.57 markus 1342: stderr_bytes += len;
1.11 markus 1343: }
1344:
1345: /* Clear and free any buffers. */
1346: memset(buf, 0, sizeof(buf));
1347: buffer_free(&stdin_buffer);
1348: buffer_free(&stdout_buffer);
1349: buffer_free(&stderr_buffer);
1350:
1351: /* Report bytes transferred, and transfer rates. */
1352: total_time = get_current_time() - start_time;
1353: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1354: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1355: if (total_time > 0)
1356: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1357: stdin_bytes / total_time, stdout_bytes / total_time,
1358: stderr_bytes / total_time);
1.11 markus 1359:
1360: /* Return the exit status of the program. */
1361: debug("Exit status %d", exit_status);
1362: return exit_status;
1.15 markus 1363: }
1364:
1365: /*********/
1366:
1.77 itojun 1367: static void
1.94 markus 1368: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1369: {
1.42 markus 1370: u_int data_len;
1.15 markus 1371: char *data = packet_get_string(&data_len);
1.93 markus 1372: packet_check_eom();
1.15 markus 1373: buffer_append(&stdout_buffer, data, data_len);
1374: memset(data, 0, data_len);
1375: xfree(data);
1376: }
1.77 itojun 1377: static void
1.94 markus 1378: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1379: {
1.42 markus 1380: u_int data_len;
1.15 markus 1381: char *data = packet_get_string(&data_len);
1.93 markus 1382: packet_check_eom();
1.15 markus 1383: buffer_append(&stderr_buffer, data, data_len);
1384: memset(data, 0, data_len);
1385: xfree(data);
1386: }
1.77 itojun 1387: static void
1.94 markus 1388: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1389: {
1390: exit_status = packet_get_int();
1.93 markus 1391: packet_check_eom();
1.15 markus 1392: /* Acknowledge the exit. */
1393: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1394: packet_send();
1395: /*
1396: * Must wait for packet to be sent since we are
1397: * exiting the loop.
1398: */
1399: packet_write_wait();
1400: /* Flag that we want to exit. */
1401: quit_pending = 1;
1402: }
1.115 markus 1403: static void
1404: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1405: {
1406: Channel *c = NULL;
1407: int remote_id, sock;
1408:
1409: /* Read the remote channel number from the message. */
1410: remote_id = packet_get_int();
1411: packet_check_eom();
1412:
1413: /*
1414: * Get a connection to the local authentication agent (this may again
1415: * get forwarded).
1416: */
1417: sock = ssh_get_authentication_socket();
1418:
1419: /*
1420: * If we could not connect the agent, send an error message back to
1421: * the server. This should never happen unless the agent dies,
1422: * because authentication forwarding is only enabled if we have an
1423: * agent.
1424: */
1425: if (sock >= 0) {
1426: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1427: -1, 0, 0, 0, "authentication agent connection", 1);
1428: c->remote_id = remote_id;
1429: c->force_drain = 1;
1430: }
1431: if (c == NULL) {
1432: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1433: packet_put_int(remote_id);
1434: } else {
1435: /* Send a confirmation to the remote host. */
1436: debug("Forwarding authentication connection.");
1437: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1438: packet_put_int(remote_id);
1439: packet_put_int(c->self);
1440: }
1441: packet_send();
1442: }
1.15 markus 1443:
1.77 itojun 1444: static Channel *
1.40 markus 1445: client_request_forwarded_tcpip(const char *request_type, int rchan)
1446: {
1.103 deraadt 1447: Channel *c = NULL;
1.40 markus 1448: char *listen_address, *originator_address;
1449: int listen_port, originator_port;
1.67 markus 1450: int sock;
1.40 markus 1451:
1452: /* Get rest of the packet */
1453: listen_address = packet_get_string(NULL);
1454: listen_port = packet_get_int();
1455: originator_address = packet_get_string(NULL);
1456: originator_port = packet_get_int();
1.93 markus 1457: packet_check_eom();
1.40 markus 1458:
1459: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1460: listen_address, listen_port, originator_address, originator_port);
1461:
1.80 stevesk 1462: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1463: if (sock < 0) {
1464: xfree(originator_address);
1465: xfree(listen_address);
1466: return NULL;
1467: }
1468: c = channel_new("forwarded-tcpip",
1469: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1470: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1471: originator_address, 1);
1.40 markus 1472: xfree(originator_address);
1473: xfree(listen_address);
1474: return c;
1475: }
1476:
1.103 deraadt 1477: static Channel *
1.40 markus 1478: client_request_x11(const char *request_type, int rchan)
1479: {
1480: Channel *c = NULL;
1481: char *originator;
1482: int originator_port;
1.67 markus 1483: int sock;
1.40 markus 1484:
1485: if (!options.forward_x11) {
1486: error("Warning: ssh server tried X11 forwarding.");
1487: error("Warning: this is probably a break in attempt by a malicious server.");
1488: return NULL;
1489: }
1490: originator = packet_get_string(NULL);
1491: if (datafellows & SSH_BUG_X11FWD) {
1492: debug2("buggy server: x11 request w/o originator_port");
1493: originator_port = 0;
1494: } else {
1495: originator_port = packet_get_int();
1496: }
1.93 markus 1497: packet_check_eom();
1.40 markus 1498: /* XXX check permission */
1.47 markus 1499: debug("client_request_x11: request from %s %d", originator,
1500: originator_port);
1.67 markus 1501: xfree(originator);
1.40 markus 1502: sock = x11_connect_display();
1.67 markus 1503: if (sock < 0)
1504: return NULL;
1505: c = channel_new("x11",
1506: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1507: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1508: c->force_drain = 1;
1.40 markus 1509: return c;
1510: }
1511:
1.103 deraadt 1512: static Channel *
1.40 markus 1513: client_request_agent(const char *request_type, int rchan)
1514: {
1515: Channel *c = NULL;
1.67 markus 1516: int sock;
1.40 markus 1517:
1518: if (!options.forward_agent) {
1519: error("Warning: ssh server tried agent forwarding.");
1520: error("Warning: this is probably a break in attempt by a malicious server.");
1521: return NULL;
1522: }
1523: sock = ssh_get_authentication_socket();
1.67 markus 1524: if (sock < 0)
1525: return NULL;
1526: c = channel_new("authentication agent connection",
1527: SSH_CHANNEL_OPEN, sock, sock, -1,
1528: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1529: "authentication agent connection", 1);
1.82 markus 1530: c->force_drain = 1;
1.40 markus 1531: return c;
1532: }
1533:
1.22 markus 1534: /* XXXX move to generic input handler */
1.77 itojun 1535: static void
1.94 markus 1536: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1537: {
1538: Channel *c = NULL;
1539: char *ctype;
1540: int rchan;
1.102 markus 1541: u_int rmaxpack, rwindow, len;
1.22 markus 1542:
1543: ctype = packet_get_string(&len);
1544: rchan = packet_get_int();
1545: rwindow = packet_get_int();
1546: rmaxpack = packet_get_int();
1547:
1.24 markus 1548: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1549: ctype, rchan, rwindow, rmaxpack);
1550:
1.40 markus 1551: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1552: c = client_request_forwarded_tcpip(ctype, rchan);
1553: } else if (strcmp(ctype, "x11") == 0) {
1554: c = client_request_x11(ctype, rchan);
1555: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1556: c = client_request_agent(ctype, rchan);
1.22 markus 1557: }
1558: /* XXX duplicate : */
1559: if (c != NULL) {
1560: debug("confirm %s", ctype);
1561: c->remote_id = rchan;
1562: c->remote_window = rwindow;
1563: c->remote_maxpacket = rmaxpack;
1.69 markus 1564: if (c->type != SSH_CHANNEL_CONNECTING) {
1565: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1566: packet_put_int(c->remote_id);
1567: packet_put_int(c->self);
1568: packet_put_int(c->local_window);
1569: packet_put_int(c->local_maxpacket);
1570: packet_send();
1571: }
1.22 markus 1572: } else {
1573: debug("failure %s", ctype);
1574: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1575: packet_put_int(rchan);
1576: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1577: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1578: packet_put_cstring("open failed");
1.66 markus 1579: packet_put_cstring("");
1580: }
1.22 markus 1581: packet_send();
1582: }
1583: xfree(ctype);
1584: }
1.77 itojun 1585: static void
1.94 markus 1586: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1587: {
1588: Channel *c = NULL;
1.123 djm 1589: int exitval, id, reply, success = 0;
1.48 markus 1590: char *rtype;
1591:
1592: id = packet_get_int();
1593: rtype = packet_get_string(NULL);
1594: reply = packet_get_char();
1595:
1596: debug("client_input_channel_req: channel %d rtype %s reply %d",
1597: id, rtype, reply);
1598:
1599: c = channel_lookup(id);
1600: if (c == NULL) {
1601: error("client_input_channel_req: channel %d: unknown channel", id);
1602: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1603: exitval = packet_get_int();
1604: if (id == session_ident) {
1605: success = 1;
1606: exit_status = exitval;
1607: } else if (c->ctl_fd == -1) {
1608: error("client_input_channel_req: unexpected channel %d",
1609: session_ident);
1610: } else {
1611: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1612: success = 1;
1613: }
1.93 markus 1614: packet_check_eom();
1.48 markus 1615: }
1616: if (reply) {
1617: packet_start(success ?
1618: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1619: packet_put_int(c->remote_id);
1620: packet_send();
1621: }
1622: xfree(rtype);
1623: }
1.95 markus 1624: static void
1625: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1626: {
1627: char *rtype;
1628: int want_reply;
1629: int success = 0;
1630:
1631: rtype = packet_get_string(NULL);
1632: want_reply = packet_get_char();
1.117 markus 1633: debug("client_input_global_request: rtype %s want_reply %d",
1634: rtype, want_reply);
1.95 markus 1635: if (want_reply) {
1636: packet_start(success ?
1637: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1638: packet_send();
1639: packet_write_wait();
1640: }
1641: xfree(rtype);
1642: }
1.22 markus 1643:
1.123 djm 1644: void
1645: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 ! djm 1646: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1647: dispatch_fn *subsys_repl)
1648: {
1649: int len;
1650:
1651: debug2("%s: id %d", __func__, id);
1652:
1653: if (want_tty) {
1654: struct winsize ws;
1655: struct termios tio;
1656:
1657: /* Store window size in the packet. */
1658: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1659: memset(&ws, 0, sizeof(ws));
1660:
1661: channel_request_start(id, "pty-req", 0);
1662: packet_put_cstring(term != NULL ? term : "");
1663: packet_put_int(ws.ws_col);
1664: packet_put_int(ws.ws_row);
1665: packet_put_int(ws.ws_xpixel);
1666: packet_put_int(ws.ws_ypixel);
1667: tio = get_saved_tio();
1668: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1669: packet_send();
1670: /* XXX wait for reply */
1671: }
1672:
1673: /* Transfer any environment variables from client to server */
1.126 ! djm 1674: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1675: int i, j, matched;
1676: char *name, *val;
1677:
1678: debug("Sending environment.");
1.126 ! djm 1679: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1680: /* Split */
1.126 ! djm 1681: name = xstrdup(env[i]);
1.123 djm 1682: if ((val = strchr(name, '=')) == NULL) {
1683: free(name);
1684: continue;
1685: }
1686: *val++ = '\0';
1687:
1688: matched = 0;
1689: for (j = 0; j < options.num_send_env; j++) {
1690: if (match_pattern(name, options.send_env[j])) {
1691: matched = 1;
1692: break;
1693: }
1694: }
1695: if (!matched) {
1696: debug3("Ignored env %s", name);
1697: free(name);
1698: continue;
1699: }
1700:
1701: debug("Sending env %s = %s", name, val);
1702: channel_request_start(id, "env", 0);
1703: packet_put_cstring(name);
1704: packet_put_cstring(val);
1705: packet_send();
1706: free(name);
1707: }
1708: }
1709:
1710: len = buffer_len(cmd);
1711: if (len > 0) {
1712: if (len > 900)
1713: len = 900;
1714: if (want_subsystem) {
1715: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1716: channel_request_start(id, "subsystem", subsys_repl != NULL);
1717: if (subsys_repl != NULL) {
1718: /* register callback for reply */
1719: /* XXX we assume that client_loop has already been called */
1720: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1721: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1722: }
1723: } else {
1724: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1725: channel_request_start(id, "exec", 0);
1726: }
1727: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1728: packet_send();
1729: } else {
1730: channel_request_start(id, "shell", 0);
1731: packet_send();
1732: }
1733: }
1734:
1.77 itojun 1735: static void
1.49 itojun 1736: client_init_dispatch_20(void)
1.16 markus 1737: {
1.55 markus 1738: dispatch_init(&dispatch_protocol_error);
1.100 markus 1739:
1.16 markus 1740: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1741: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1742: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1743: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1744: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1745: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1746: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1747: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1748: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1749: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1750:
1751: /* rekeying */
1752: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1753:
1754: /* global request reply messages */
1755: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1756: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1757: }
1.77 itojun 1758: static void
1.49 itojun 1759: client_init_dispatch_13(void)
1.15 markus 1760: {
1761: dispatch_init(NULL);
1762: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1763: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1764: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1765: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1766: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1767: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1768: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1769: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1770: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1771:
1772: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1773: &client_input_agent_open : &deny_input_open);
1.39 markus 1774: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1775: &x11_input_open : &deny_input_open);
1.15 markus 1776: }
1.77 itojun 1777: static void
1.49 itojun 1778: client_init_dispatch_15(void)
1.15 markus 1779: {
1780: client_init_dispatch_13();
1781: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1782: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1783: }
1.79 stevesk 1784: static void
1.49 itojun 1785: client_init_dispatch(void)
1.15 markus 1786: {
1.16 markus 1787: if (compat20)
1788: client_init_dispatch_20();
1789: else if (compat13)
1.15 markus 1790: client_init_dispatch_13();
1791: else
1792: client_init_dispatch_15();
1.113 markus 1793: }
1794:
1795: /* client specific fatal cleanup */
1796: void
1.114 markus 1797: cleanup_exit(int i)
1.113 markus 1798: {
1799: leave_raw_mode();
1800: leave_non_blocking();
1.123 djm 1801: if (options.control_path != NULL && control_fd != -1)
1802: unlink(options.control_path);
1.114 markus 1803: _exit(i);
1.1 deraadt 1804: }
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