Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.136
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"
1.136 ! deraadt 62: RCSID("$OpenBSD: clientloop.c,v 1.135 2005/03/01 10:09:52 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,
1.130 avsm 351: int *maxfdp, u_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;
1.129 deraadt 405: else {
1.117 markus 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: /* Flush stdout and stderr buffers. */
1.31 markus 436: if (buffer_len(bout) > 0)
1.112 deraadt 437: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 438: if (buffer_len(berr) > 0)
1.112 deraadt 439: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 440:
441: leave_raw_mode();
442:
1.13 markus 443: /*
444: * Free (and clear) the buffer to reduce the amount of data that gets
445: * written to swap.
446: */
1.31 markus 447: buffer_free(bin);
448: buffer_free(bout);
449: buffer_free(berr);
1.11 markus 450:
451: /* Send the suspend signal to the program itself. */
452: kill(getpid(), SIGTSTP);
453:
1.132 djm 454: /* Reset window sizes in case they have changed */
455: received_window_change_signal = 1;
1.11 markus 456:
457: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 458: buffer_init(bin);
459: buffer_init(bout);
460: buffer_init(berr);
1.11 markus 461:
462: enter_raw_mode();
463: }
464:
1.77 itojun 465: static void
1.17 markus 466: client_process_net_input(fd_set * readset)
1.11 markus 467: {
1.17 markus 468: int len;
469: char buf[8192];
1.11 markus 470:
1.13 markus 471: /*
472: * Read input from the server, and add any such data to the buffer of
473: * the packet subsystem.
474: */
1.11 markus 475: if (FD_ISSET(connection_in, readset)) {
476: /* Read as much as possible. */
477: len = read(connection_in, buf, sizeof(buf));
478: if (len == 0) {
479: /* Received EOF. The remote host has closed the connection. */
480: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
481: host);
1.1 deraadt 482: buffer_append(&stderr_buffer, buf, strlen(buf));
483: quit_pending = 1;
484: return;
1.11 markus 485: }
1.13 markus 486: /*
487: * There is a kernel bug on Solaris that causes select to
488: * sometimes wake up even though there is no data available.
489: */
1.53 millert 490: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 491: len = 0;
492:
493: if (len < 0) {
494: /* An error has encountered. Perhaps there is a network problem. */
495: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
496: host, strerror(errno));
497: buffer_append(&stderr_buffer, buf, strlen(buf));
498: quit_pending = 1;
499: return;
500: }
501: packet_process_incoming(buf, len);
502: }
1.17 markus 503: }
1.16 markus 504:
1.97 jakob 505: static void
1.123 djm 506: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
507: {
508: int id;
509: Channel *c;
1.129 deraadt 510:
1.123 djm 511: id = packet_get_int();
512: packet_check_eom();
513:
514: if ((c = channel_lookup(id)) == NULL) {
515: error("%s: no channel for id %d", __func__, id);
516: return;
517: }
518:
519: if (type == SSH2_MSG_CHANNEL_SUCCESS)
520: debug2("Request suceeded on channel %d", id);
521: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
522: error("Request failed on channel %d", id);
523: channel_free(c);
524: }
525: }
526:
527: static void
528: client_extra_session2_setup(int id, void *arg)
529: {
530: struct confirm_ctx *cctx = arg;
531: Channel *c;
1.126 djm 532: int i;
1.129 deraadt 533:
1.123 djm 534: if (cctx == NULL)
535: fatal("%s: cctx == NULL", __func__);
536: if ((c = channel_lookup(id)) == NULL)
537: fatal("%s: no channel for id %d", __func__, id);
538:
1.129 deraadt 539: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 540: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 541: client_subsystem_reply);
1.127 djm 542:
1.123 djm 543: c->confirm_ctx = NULL;
544: buffer_free(&cctx->cmd);
1.126 djm 545: xfree(cctx->term);
546: if (cctx->env != NULL) {
547: for (i = 0; cctx->env[i] != NULL; i++)
548: xfree(cctx->env[i]);
549: xfree(cctx->env);
1.129 deraadt 550: }
1.126 djm 551: xfree(cctx);
1.123 djm 552: }
553:
554: static void
555: client_process_control(fd_set * readset)
556: {
557: Buffer m;
558: Channel *c;
1.127 djm 559: int client_fd, new_fd[3], ver, i, allowed;
1.123 djm 560: socklen_t addrlen;
561: struct sockaddr_storage addr;
562: struct confirm_ctx *cctx;
563: char *cmd;
1.134 djm 564: u_int len, env_len, command, flags;
1.123 djm 565: uid_t euid;
566: gid_t egid;
567:
568: /*
569: * Accept connection on control socket
570: */
571: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
572: return;
573:
574: memset(&addr, 0, sizeof(addr));
575: addrlen = sizeof(addr);
576: if ((client_fd = accept(control_fd,
577: (struct sockaddr*)&addr, &addrlen)) == -1) {
578: error("%s accept: %s", __func__, strerror(errno));
579: return;
580: }
581:
582: if (getpeereid(client_fd, &euid, &egid) < 0) {
583: error("%s getpeereid failed: %s", __func__, strerror(errno));
584: close(client_fd);
585: return;
586: }
587: if ((euid != 0) && (getuid() != euid)) {
588: error("control mode uid mismatch: peer euid %u != uid %u",
589: (u_int) euid, (u_int) getuid());
590: close(client_fd);
591: return;
592: }
1.127 djm 593:
1.134 djm 594: unset_nonblock(client_fd);
595:
596: /* Read command */
597: buffer_init(&m);
598: if (ssh_msg_recv(client_fd, &m) == -1) {
599: error("%s: client msg_recv failed", __func__);
600: close(client_fd);
601: buffer_free(&m);
602: return;
603: }
604: if ((ver = buffer_get_char(&m)) != 1) {
605: error("%s: wrong client version %d", __func__, ver);
606: buffer_free(&m);
607: close(client_fd);
608: return;
609: }
610:
1.127 djm 611: allowed = 1;
1.134 djm 612: command = buffer_get_int(&m);
613: flags = buffer_get_int(&m);
1.123 djm 614:
1.134 djm 615: buffer_clear(&m);
1.123 djm 616:
1.134 djm 617: switch (command) {
618: case SSHMUX_COMMAND_OPEN:
619: if (options.control_master == 2)
620: allowed = ask_permission("Allow shared connection "
621: "to %s? ", host);
622: /* continue below */
623: break;
624: case SSHMUX_COMMAND_TERMINATE:
625: if (options.control_master == 2)
626: allowed = ask_permission("Terminate shared connection "
627: "to %s? ", host);
628: if (allowed)
629: quit_pending = 1;
1.136 ! deraadt 630: /* FALLTHROUGH */
1.134 djm 631: case SSHMUX_COMMAND_ALIVE_CHECK:
632: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
633: buffer_clear(&m);
634: buffer_put_int(&m, allowed);
635: buffer_put_int(&m, getpid());
636: if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
637: error("%s: client msg_send failed", __func__);
638: close(client_fd);
639: buffer_free(&m);
640: return;
641: }
642: buffer_free(&m);
643: close(client_fd);
644: return;
645: default:
646: error("Unsupported command %d", command);
647: buffer_free(&m);
648: close(client_fd);
649: return;
650: }
1.123 djm 651:
1.134 djm 652: /* Reply for SSHMUX_COMMAND_OPEN */
653: buffer_clear(&m);
1.127 djm 654: buffer_put_int(&m, allowed);
1.123 djm 655: buffer_put_int(&m, getpid());
1.134 djm 656: if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
1.123 djm 657: error("%s: client msg_send failed", __func__);
658: close(client_fd);
1.127 djm 659: buffer_free(&m);
1.123 djm 660: return;
661: }
662:
1.127 djm 663: if (!allowed) {
664: error("Refused control connection");
665: close(client_fd);
666: buffer_free(&m);
667: return;
668: }
669:
1.134 djm 670: buffer_clear(&m);
1.123 djm 671: if (ssh_msg_recv(client_fd, &m) == -1) {
672: error("%s: client msg_recv failed", __func__);
673: close(client_fd);
1.127 djm 674: buffer_free(&m);
1.123 djm 675: return;
676: }
1.134 djm 677: if ((ver = buffer_get_char(&m)) != 1) {
1.123 djm 678: error("%s: wrong client version %d", __func__, ver);
679: buffer_free(&m);
680: close(client_fd);
681: return;
682: }
683:
684: cctx = xmalloc(sizeof(*cctx));
685: memset(cctx, 0, sizeof(*cctx));
1.134 djm 686: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
687: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.123 djm 688: cctx->term = buffer_get_string(&m, &len);
689:
690: cmd = buffer_get_string(&m, &len);
691: buffer_init(&cctx->cmd);
692: buffer_append(&cctx->cmd, cmd, strlen(cmd));
693:
1.126 djm 694: env_len = buffer_get_int(&m);
695: env_len = MIN(env_len, 4096);
696: debug3("%s: receiving %d env vars", __func__, env_len);
697: if (env_len != 0) {
698: cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
699: for (i = 0; i < env_len; i++)
700: cctx->env[i] = buffer_get_string(&m, &len);
701: cctx->env[i] = NULL;
702: }
703:
1.123 djm 704: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
705: cctx->want_tty, cctx->want_subsys, cmd);
706:
707: /* Gather fds from client */
708: new_fd[0] = mm_receive_fd(client_fd);
709: new_fd[1] = mm_receive_fd(client_fd);
710: new_fd[2] = mm_receive_fd(client_fd);
711:
712: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
713: new_fd[0], new_fd[1], new_fd[2]);
714:
715: /* Try to pick up ttymodes from client before it goes raw */
716: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
717: error("%s: tcgetattr: %s", __func__, strerror(errno));
718:
1.134 djm 719: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 720: buffer_clear(&m);
1.134 djm 721: if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
1.123 djm 722: error("%s: client msg_send failed", __func__);
723: close(client_fd);
724: close(new_fd[0]);
725: close(new_fd[1]);
726: close(new_fd[2]);
1.127 djm 727: buffer_free(&m);
1.134 djm 728: xfree(cctx->term);
729: if (env_len != 0) {
730: for (i = 0; i < env_len; i++)
731: xfree(cctx->env[i]);
732: xfree(cctx->env);
733: }
1.123 djm 734: return;
735: }
736: buffer_free(&m);
737:
738: /* enable nonblocking unless tty */
739: if (!isatty(new_fd[0]))
740: set_nonblock(new_fd[0]);
741: if (!isatty(new_fd[1]))
742: set_nonblock(new_fd[1]);
743: if (!isatty(new_fd[2]))
744: set_nonblock(new_fd[2]);
745:
746: set_nonblock(client_fd);
747:
1.129 deraadt 748: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 749: new_fd[0], new_fd[1], new_fd[2],
750: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
751: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
752:
753: /* XXX */
754: c->ctl_fd = client_fd;
755:
756: debug3("%s: channel_new: %d", __func__, c->self);
757:
758: channel_send_open(c->self);
759: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
760: }
761:
762: static void
1.99 markus 763: process_cmdline(void)
1.97 jakob 764: {
765: void (*handler)(int);
1.135 djm 766: char *s, *cmd, *cancel_host;
1.121 djm 767: int delete = 0;
1.97 jakob 768: int local = 0;
1.135 djm 769: u_short cancel_port;
770: Forward fwd;
1.97 jakob 771:
772: leave_raw_mode();
1.101 markus 773: handler = signal(SIGINT, SIG_IGN);
1.99 markus 774: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 775: if (s == NULL)
776: goto out;
777: while (*s && isspace(*s))
778: s++;
1.121 djm 779: if (*s == '-')
780: s++; /* Skip cmdline '-', if any */
1.120 dtucker 781: if (*s == '\0')
1.97 jakob 782: goto out;
1.121 djm 783:
1.122 djm 784: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 785: logit("Commands:");
786: logit(" -Lport:host:hostport Request local forward");
787: logit(" -Rport:host:hostport Request remote forward");
788: logit(" -KRhostport Cancel remote forward");
789: goto out;
790: }
791:
792: if (*s == 'K') {
793: delete = 1;
794: s++;
795: }
796: if (*s != 'L' && *s != 'R') {
1.109 itojun 797: logit("Invalid command.");
1.97 jakob 798: goto out;
799: }
1.121 djm 800: if (*s == 'L')
1.97 jakob 801: local = 1;
1.121 djm 802: if (local && delete) {
803: logit("Not supported.");
804: goto out;
805: }
806: if ((!local || delete) && !compat20) {
1.109 itojun 807: logit("Not supported for SSH protocol version 1.");
1.97 jakob 808: goto out;
809: }
1.121 djm 810:
811: s++;
1.97 jakob 812: while (*s && isspace(*s))
813: s++;
814:
1.121 djm 815: if (delete) {
1.135 djm 816: cancel_port = 0;
817: cancel_host = hpdelim(&s); /* may be NULL */
818: if (s != NULL) {
819: cancel_port = a2port(s);
820: cancel_host = cleanhostname(cancel_host);
821: } else {
822: cancel_port = a2port(cancel_host);
823: cancel_host = NULL;
1.121 djm 824: }
1.135 djm 825: if (cancel_port == 0) {
826: logit("Bad forwarding close port");
1.121 djm 827: goto out;
828: }
1.135 djm 829: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 830: } else {
1.135 djm 831: if (!parse_forward(&fwd, s)) {
1.121 djm 832: logit("Bad forwarding specification.");
833: goto out;
834: }
835: if (local) {
1.135 djm 836: if (channel_setup_local_fwd_listener(fwd.listen_host,
837: fwd.listen_port, fwd.connect_host,
838: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 839: logit("Port forwarding failed.");
840: goto out;
841: }
1.135 djm 842: } else {
843: channel_request_remote_forwarding(fwd.listen_host,
844: fwd.listen_port, fwd.connect_host,
845: fwd.connect_port);
846: }
847:
1.121 djm 848: logit("Forwarding port.");
849: }
850:
1.97 jakob 851: out:
852: signal(SIGINT, handler);
853: enter_raw_mode();
854: if (cmd)
855: xfree(cmd);
856: }
857:
1.31 markus 858: /* process the characters one by one */
1.77 itojun 859: static int
1.31 markus 860: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
861: {
1.32 markus 862: char string[1024];
1.31 markus 863: pid_t pid;
864: int bytes = 0;
1.42 markus 865: u_int i;
866: u_char ch;
1.31 markus 867: char *s;
868:
869: for (i = 0; i < len; i++) {
870: /* Get one character at a time. */
871: ch = buf[i];
872:
873: if (escape_pending) {
874: /* We have previously seen an escape character. */
875: /* Clear the flag now. */
876: escape_pending = 0;
877:
878: /* Process the escaped character. */
879: switch (ch) {
880: case '.':
881: /* Terminate the connection. */
1.32 markus 882: snprintf(string, sizeof string, "%c.\r\n", escape_char);
883: buffer_append(berr, string, strlen(string));
1.31 markus 884:
885: quit_pending = 1;
886: return -1;
887:
888: case 'Z' - 64:
889: /* Suspend the program. */
890: /* Print a message to that effect to the user. */
1.32 markus 891: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
892: buffer_append(berr, string, strlen(string));
1.31 markus 893:
894: /* Restore terminal modes and suspend. */
895: client_suspend_self(bin, bout, berr);
896:
897: /* We have been continued. */
898: continue;
899:
1.111 markus 900: case 'B':
901: if (compat20) {
902: snprintf(string, sizeof string,
903: "%cB\r\n", escape_char);
904: buffer_append(berr, string,
905: strlen(string));
906: channel_request_start(session_ident,
907: "break", 0);
908: packet_put_int(1000);
909: packet_send();
910: }
911: continue;
912:
1.54 markus 913: case 'R':
1.59 markus 914: if (compat20) {
915: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 916: logit("Server does not support re-keying");
1.59 markus 917: else
918: need_rekeying = 1;
919: }
1.54 markus 920: continue;
921:
1.31 markus 922: case '&':
923: /*
924: * Detach the program (continue to serve connections,
925: * but put in background and no more new connections).
926: */
927: /* Restore tty modes. */
928: leave_raw_mode();
929:
930: /* Stop listening for new connections. */
1.86 markus 931: channel_stop_listening();
1.31 markus 932:
1.86 markus 933: snprintf(string, sizeof string,
934: "%c& [backgrounded]\n", escape_char);
935: buffer_append(berr, string, strlen(string));
1.31 markus 936:
937: /* Fork into background. */
938: pid = fork();
939: if (pid < 0) {
940: error("fork: %.100s", strerror(errno));
941: continue;
942: }
943: if (pid != 0) { /* This is the parent. */
944: /* The parent just exits. */
945: exit(0);
946: }
947: /* The child continues serving connections. */
1.86 markus 948: if (compat20) {
949: buffer_append(bin, "\004", 1);
950: /* fake EOF on stdin */
951: return -1;
952: } else if (!stdin_eof) {
953: /*
954: * Sending SSH_CMSG_EOF alone does not always appear
955: * to be enough. So we try to send an EOF character
956: * first.
957: */
958: packet_start(SSH_CMSG_STDIN_DATA);
959: packet_put_string("\004", 1);
960: packet_send();
961: /* Close stdin. */
962: stdin_eof = 1;
963: if (buffer_len(bin) == 0) {
964: packet_start(SSH_CMSG_EOF);
965: packet_send();
966: }
967: }
968: continue;
1.31 markus 969:
970: case '?':
1.32 markus 971: snprintf(string, sizeof string,
1.31 markus 972: "%c?\r\n\
973: Supported escape sequences:\r\n\
1.104 stevesk 974: %c. - terminate connection\r\n\
1.111 markus 975: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 976: %cC - open a command line\r\n\
977: %cR - Request rekey (SSH protocol 2 only)\r\n\
978: %c^Z - suspend ssh\r\n\
979: %c# - list forwarded connections\r\n\
980: %c& - background ssh (when waiting for connections to terminate)\r\n\
981: %c? - this message\r\n\
982: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 983: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 984: escape_char, escape_char, escape_char, escape_char,
985: escape_char, escape_char, escape_char, escape_char,
1.111 markus 986: escape_char, escape_char, escape_char);
1.32 markus 987: buffer_append(berr, string, strlen(string));
1.31 markus 988: continue;
989:
990: case '#':
1.32 markus 991: snprintf(string, sizeof string, "%c#\r\n", escape_char);
992: buffer_append(berr, string, strlen(string));
1.31 markus 993: s = channel_open_message();
994: buffer_append(berr, s, strlen(s));
995: xfree(s);
1.97 jakob 996: continue;
997:
998: case 'C':
1.99 markus 999: process_cmdline();
1.31 markus 1000: continue;
1001:
1002: default:
1003: if (ch != escape_char) {
1004: buffer_put_char(bin, escape_char);
1005: bytes++;
1006: }
1007: /* Escaped characters fall through here */
1008: break;
1009: }
1010: } else {
1011: /*
1012: * The previous character was not an escape char. Check if this
1013: * is an escape.
1014: */
1015: if (last_was_cr && ch == escape_char) {
1016: /* It is. Set the flag and continue to next character. */
1017: escape_pending = 1;
1018: continue;
1019: }
1020: }
1021:
1022: /*
1023: * Normal character. Record whether it was a newline,
1024: * and append it to the buffer.
1025: */
1026: last_was_cr = (ch == '\r' || ch == '\n');
1027: buffer_put_char(bin, ch);
1028: bytes++;
1029: }
1030: return bytes;
1031: }
1032:
1.77 itojun 1033: static void
1.17 markus 1034: client_process_input(fd_set * readset)
1035: {
1.21 deraadt 1036: int len;
1.31 markus 1037: char buf[8192];
1.16 markus 1038:
1.11 markus 1039: /* Read input from stdin. */
1040: if (FD_ISSET(fileno(stdin), readset)) {
1041: /* Read as much as possible. */
1042: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1043: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1044: return; /* we'll try again later */
1.11 markus 1045: if (len <= 0) {
1.13 markus 1046: /*
1047: * Received EOF or error. They are treated
1048: * similarly, except that an error message is printed
1049: * if it was an error condition.
1050: */
1.11 markus 1051: if (len < 0) {
1052: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1053: buffer_append(&stderr_buffer, buf, strlen(buf));
1054: }
1055: /* Mark that we have seen EOF. */
1056: stdin_eof = 1;
1.13 markus 1057: /*
1058: * Send an EOF message to the server unless there is
1059: * data in the buffer. If there is data in the
1060: * buffer, no message will be sent now. Code
1061: * elsewhere will send the EOF when the buffer
1062: * becomes empty if stdin_eof is set.
1063: */
1.11 markus 1064: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1065: packet_start(SSH_CMSG_EOF);
1066: packet_send();
1.11 markus 1067: }
1.72 stevesk 1068: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1069: /*
1070: * Normal successful read, and no escape character.
1071: * Just append the data to buffer.
1072: */
1.11 markus 1073: buffer_append(&stdin_buffer, buf, len);
1074: } else {
1.13 markus 1075: /*
1076: * Normal, successful read. But we have an escape character
1077: * and have to process the characters one by one.
1078: */
1.52 markus 1079: if (process_escapes(&stdin_buffer, &stdout_buffer,
1080: &stderr_buffer, buf, len) == -1)
1.31 markus 1081: return;
1.11 markus 1082: }
1083: }
1084: }
1085:
1.77 itojun 1086: static void
1.11 markus 1087: client_process_output(fd_set * writeset)
1088: {
1089: int len;
1090: char buf[100];
1.1 deraadt 1091:
1.11 markus 1092: /* Write buffered output to stdout. */
1093: if (FD_ISSET(fileno(stdout), writeset)) {
1094: /* Write as much data as possible. */
1095: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1096: buffer_len(&stdout_buffer));
1.11 markus 1097: if (len <= 0) {
1.64 markus 1098: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1099: len = 0;
1100: else {
1.13 markus 1101: /*
1102: * An error or EOF was encountered. Put an
1103: * error message to stderr buffer.
1104: */
1.11 markus 1105: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1106: buffer_append(&stderr_buffer, buf, strlen(buf));
1107: quit_pending = 1;
1108: return;
1109: }
1110: }
1111: /* Consume printed data from the buffer. */
1112: buffer_consume(&stdout_buffer, len);
1.57 markus 1113: stdout_bytes += len;
1.11 markus 1114: }
1115: /* Write buffered output to stderr. */
1116: if (FD_ISSET(fileno(stderr), writeset)) {
1117: /* Write as much data as possible. */
1118: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1119: buffer_len(&stderr_buffer));
1.11 markus 1120: if (len <= 0) {
1.64 markus 1121: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1122: len = 0;
1123: else {
1.13 markus 1124: /* EOF or error, but can't even print error message. */
1.11 markus 1125: quit_pending = 1;
1126: return;
1127: }
1128: }
1129: /* Consume printed characters from the buffer. */
1130: buffer_consume(&stderr_buffer, len);
1.57 markus 1131: stderr_bytes += len;
1.11 markus 1132: }
1.1 deraadt 1133: }
1134:
1.13 markus 1135: /*
1.15 markus 1136: * Get packets from the connection input buffer, and process them as long as
1137: * there are packets available.
1138: *
1139: * Any unknown packets received during the actual
1140: * session cause the session to terminate. This is
1141: * intended to make debugging easier since no
1142: * confirmations are sent. Any compatible protocol
1143: * extensions must be negotiated during the
1144: * preparatory phase.
1145: */
1146:
1.77 itojun 1147: static void
1.49 itojun 1148: client_process_buffered_input_packets(void)
1.15 markus 1149: {
1.54 markus 1150: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1151: }
1152:
1.31 markus 1153: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1154:
1.77 itojun 1155: static int
1.31 markus 1156: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1157: {
1.31 markus 1158: /* XXX we assume c->extended is writeable */
1159: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1160: }
1161:
1.77 itojun 1162: static void
1.60 markus 1163: client_channel_closed(int id, void *arg)
1164: {
1.83 markus 1165: channel_cancel_cleanup(id);
1.60 markus 1166: session_closed = 1;
1.113 markus 1167: leave_raw_mode();
1.60 markus 1168: }
1169:
1.15 markus 1170: /*
1.13 markus 1171: * Implements the interactive session with the server. This is called after
1172: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1173: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1174: * used as an escape character for terminating or suspending the session.
1.13 markus 1175: */
1.1 deraadt 1176:
1.20 markus 1177: int
1.30 markus 1178: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1179: {
1.46 markus 1180: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1181: double start_time, total_time;
1.130 avsm 1182: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1183: u_int nalloc = 0;
1.11 markus 1184: char buf[100];
1185:
1186: debug("Entering interactive session.");
1187:
1188: start_time = get_current_time();
1189:
1190: /* Initialize variables. */
1191: escape_pending = 0;
1192: last_was_cr = 1;
1193: exit_status = -1;
1194: stdin_eof = 0;
1195: buffer_high = 64 * 1024;
1196: connection_in = packet_get_connection_in();
1197: connection_out = packet_get_connection_out();
1.46 markus 1198: max_fd = MAX(connection_in, connection_out);
1.123 djm 1199: if (control_fd != -1)
1200: max_fd = MAX(max_fd, control_fd);
1.46 markus 1201:
1202: if (!compat20) {
1.63 markus 1203: /* enable nonblocking unless tty */
1204: if (!isatty(fileno(stdin)))
1205: set_nonblock(fileno(stdin));
1206: if (!isatty(fileno(stdout)))
1207: set_nonblock(fileno(stdout));
1208: if (!isatty(fileno(stderr)))
1209: set_nonblock(fileno(stderr));
1.46 markus 1210: max_fd = MAX(max_fd, fileno(stdin));
1211: max_fd = MAX(max_fd, fileno(stdout));
1212: max_fd = MAX(max_fd, fileno(stderr));
1213: }
1.11 markus 1214: stdin_bytes = 0;
1215: stdout_bytes = 0;
1216: stderr_bytes = 0;
1217: quit_pending = 0;
1218: escape_char = escape_char_arg;
1219:
1220: /* Initialize buffers. */
1221: buffer_init(&stdin_buffer);
1222: buffer_init(&stdout_buffer);
1223: buffer_init(&stderr_buffer);
1224:
1.15 markus 1225: client_init_dispatch();
1226:
1.105 markus 1227: /*
1228: * Set signal handlers, (e.g. to restore non-blocking mode)
1229: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1230: */
1.131 djm 1231: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1232: signal(SIGHUP, signal_handler);
1.105 markus 1233: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1234: signal(SIGINT, signal_handler);
1235: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1236: signal(SIGQUIT, signal_handler);
1237: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1238: signal(SIGTERM, signal_handler);
1.132 djm 1239: signal(SIGWINCH, window_change_handler);
1.11 markus 1240:
1241: if (have_pty)
1242: enter_raw_mode();
1243:
1.48 markus 1244: if (compat20) {
1245: session_ident = ssh2_chan_id;
1.72 stevesk 1246: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1247: channel_register_filter(session_ident,
1248: simple_escape_filter);
1.60 markus 1249: if (session_ident != -1)
1250: channel_register_cleanup(session_ident,
1251: client_channel_closed);
1.48 markus 1252: } else {
1253: /* Check if we should immediately send eof on stdin. */
1.16 markus 1254: client_check_initial_eof_on_stdin();
1.48 markus 1255: }
1.30 markus 1256:
1.11 markus 1257: /* Main loop of the client for the interactive session mode. */
1258: while (!quit_pending) {
1259:
1.13 markus 1260: /* Process buffered packets sent by the server. */
1.11 markus 1261: client_process_buffered_input_packets();
1262:
1.60 markus 1263: if (compat20 && session_closed && !channel_still_open())
1264: break;
1265:
1.56 markus 1266: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1267:
1.56 markus 1268: if (rekeying) {
1269: debug("rekeying in progress");
1270: } else {
1271: /*
1272: * Make packets of buffered stdin data, and buffer
1273: * them for sending to the server.
1274: */
1275: if (!compat20)
1276: client_make_packets_from_stdin_data();
1.11 markus 1277:
1.56 markus 1278: /*
1279: * Make packets from buffered channel data, and
1280: * enqueue them for sending to the server.
1281: */
1282: if (packet_not_very_much_data_to_write())
1283: channel_output_poll();
1.11 markus 1284:
1.56 markus 1285: /*
1286: * Check if the window size has changed, and buffer a
1287: * message about it to the server if so.
1288: */
1289: client_check_window_change();
1.11 markus 1290:
1.56 markus 1291: if (quit_pending)
1292: break;
1293: }
1.13 markus 1294: /*
1295: * Wait until we have something to do (something becomes
1296: * available on one of the descriptors).
1297: */
1.81 markus 1298: max_fd2 = max_fd;
1.56 markus 1299: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1300: &max_fd2, &nalloc, rekeying);
1.11 markus 1301:
1302: if (quit_pending)
1303: break;
1304:
1.56 markus 1305: /* Do channel operations unless rekeying in progress. */
1306: if (!rekeying) {
1307: channel_after_select(readset, writeset);
1.108 markus 1308: if (need_rekeying || packet_need_rekeying()) {
1309: debug("need rekeying");
1.56 markus 1310: xxx_kex->done = 0;
1311: kex_send_kexinit(xxx_kex);
1312: need_rekeying = 0;
1313: }
1314: }
1.11 markus 1315:
1.17 markus 1316: /* Buffer input from the connection. */
1.46 markus 1317: client_process_net_input(readset);
1.17 markus 1318:
1.123 djm 1319: /* Accept control connections. */
1320: client_process_control(readset);
1321:
1.17 markus 1322: if (quit_pending)
1323: break;
1.11 markus 1324:
1.17 markus 1325: if (!compat20) {
1326: /* Buffer data from stdin */
1.46 markus 1327: client_process_input(readset);
1.17 markus 1328: /*
1329: * Process output to stdout and stderr. Output to
1330: * the connection is processed elsewhere (above).
1331: */
1.46 markus 1332: client_process_output(writeset);
1.17 markus 1333: }
1.11 markus 1334:
1.13 markus 1335: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1336: if (FD_ISSET(connection_out, writeset))
1.11 markus 1337: packet_write_poll();
1338: }
1.46 markus 1339: if (readset)
1340: xfree(readset);
1341: if (writeset)
1342: xfree(writeset);
1.11 markus 1343:
1344: /* Terminate the session. */
1345:
1346: /* Stop watching for window change. */
1.132 djm 1347: signal(SIGWINCH, SIG_DFL);
1.11 markus 1348:
1.76 markus 1349: channel_free_all();
1.11 markus 1350:
1.75 markus 1351: if (have_pty)
1352: leave_raw_mode();
1353:
1354: /* restore blocking io */
1355: if (!isatty(fileno(stdin)))
1356: unset_nonblock(fileno(stdin));
1357: if (!isatty(fileno(stdout)))
1358: unset_nonblock(fileno(stdout));
1359: if (!isatty(fileno(stderr)))
1360: unset_nonblock(fileno(stderr));
1.116 dtucker 1361:
1362: /*
1363: * If there was no shell or command requested, there will be no remote
1364: * exit status to be returned. In that case, clear error code if the
1365: * connection was deliberately terminated at this end.
1366: */
1367: if (no_shell_flag && received_signal == SIGTERM) {
1368: received_signal = 0;
1369: exit_status = 0;
1370: }
1.75 markus 1371:
1.113 markus 1372: if (received_signal)
1.89 itojun 1373: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1374:
1.13 markus 1375: /*
1376: * In interactive mode (with pseudo tty) display a message indicating
1377: * that the connection has been closed.
1378: */
1.11 markus 1379: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1380: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1381: buffer_append(&stderr_buffer, buf, strlen(buf));
1382: }
1.70 markus 1383:
1.11 markus 1384: /* Output any buffered data for stdout. */
1.70 markus 1385: while (buffer_len(&stdout_buffer) > 0) {
1386: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1387: buffer_len(&stdout_buffer));
1.70 markus 1388: if (len <= 0) {
1.11 markus 1389: error("Write failed flushing stdout buffer.");
1.70 markus 1390: break;
1391: }
1.11 markus 1392: buffer_consume(&stdout_buffer, len);
1.57 markus 1393: stdout_bytes += len;
1.11 markus 1394: }
1395:
1396: /* Output any buffered data for stderr. */
1.70 markus 1397: while (buffer_len(&stderr_buffer) > 0) {
1398: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1399: buffer_len(&stderr_buffer));
1.70 markus 1400: if (len <= 0) {
1.11 markus 1401: error("Write failed flushing stderr buffer.");
1.70 markus 1402: break;
1403: }
1.11 markus 1404: buffer_consume(&stderr_buffer, len);
1.57 markus 1405: stderr_bytes += len;
1.11 markus 1406: }
1407:
1408: /* Clear and free any buffers. */
1409: memset(buf, 0, sizeof(buf));
1410: buffer_free(&stdin_buffer);
1411: buffer_free(&stdout_buffer);
1412: buffer_free(&stderr_buffer);
1413:
1414: /* Report bytes transferred, and transfer rates. */
1415: total_time = get_current_time() - start_time;
1416: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1417: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1418: if (total_time > 0)
1419: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1420: stdin_bytes / total_time, stdout_bytes / total_time,
1421: stderr_bytes / total_time);
1.11 markus 1422:
1423: /* Return the exit status of the program. */
1424: debug("Exit status %d", exit_status);
1425: return exit_status;
1.15 markus 1426: }
1427:
1428: /*********/
1429:
1.77 itojun 1430: static void
1.94 markus 1431: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1432: {
1.42 markus 1433: u_int data_len;
1.15 markus 1434: char *data = packet_get_string(&data_len);
1.93 markus 1435: packet_check_eom();
1.15 markus 1436: buffer_append(&stdout_buffer, data, data_len);
1437: memset(data, 0, data_len);
1438: xfree(data);
1439: }
1.77 itojun 1440: static void
1.94 markus 1441: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1442: {
1.42 markus 1443: u_int data_len;
1.15 markus 1444: char *data = packet_get_string(&data_len);
1.93 markus 1445: packet_check_eom();
1.15 markus 1446: buffer_append(&stderr_buffer, data, data_len);
1447: memset(data, 0, data_len);
1448: xfree(data);
1449: }
1.77 itojun 1450: static void
1.94 markus 1451: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1452: {
1453: exit_status = packet_get_int();
1.93 markus 1454: packet_check_eom();
1.15 markus 1455: /* Acknowledge the exit. */
1456: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1457: packet_send();
1458: /*
1459: * Must wait for packet to be sent since we are
1460: * exiting the loop.
1461: */
1462: packet_write_wait();
1463: /* Flag that we want to exit. */
1464: quit_pending = 1;
1465: }
1.115 markus 1466: static void
1467: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1468: {
1469: Channel *c = NULL;
1470: int remote_id, sock;
1471:
1472: /* Read the remote channel number from the message. */
1473: remote_id = packet_get_int();
1474: packet_check_eom();
1475:
1476: /*
1477: * Get a connection to the local authentication agent (this may again
1478: * get forwarded).
1479: */
1480: sock = ssh_get_authentication_socket();
1481:
1482: /*
1483: * If we could not connect the agent, send an error message back to
1484: * the server. This should never happen unless the agent dies,
1485: * because authentication forwarding is only enabled if we have an
1486: * agent.
1487: */
1488: if (sock >= 0) {
1489: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1490: -1, 0, 0, 0, "authentication agent connection", 1);
1491: c->remote_id = remote_id;
1492: c->force_drain = 1;
1493: }
1494: if (c == NULL) {
1495: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1496: packet_put_int(remote_id);
1497: } else {
1498: /* Send a confirmation to the remote host. */
1499: debug("Forwarding authentication connection.");
1500: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1501: packet_put_int(remote_id);
1502: packet_put_int(c->self);
1503: }
1504: packet_send();
1505: }
1.15 markus 1506:
1.77 itojun 1507: static Channel *
1.40 markus 1508: client_request_forwarded_tcpip(const char *request_type, int rchan)
1509: {
1.103 deraadt 1510: Channel *c = NULL;
1.40 markus 1511: char *listen_address, *originator_address;
1512: int listen_port, originator_port;
1.67 markus 1513: int sock;
1.40 markus 1514:
1515: /* Get rest of the packet */
1516: listen_address = packet_get_string(NULL);
1517: listen_port = packet_get_int();
1518: originator_address = packet_get_string(NULL);
1519: originator_port = packet_get_int();
1.93 markus 1520: packet_check_eom();
1.40 markus 1521:
1522: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1523: listen_address, listen_port, originator_address, originator_port);
1524:
1.80 stevesk 1525: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1526: if (sock < 0) {
1527: xfree(originator_address);
1528: xfree(listen_address);
1529: return NULL;
1530: }
1531: c = channel_new("forwarded-tcpip",
1532: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1533: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1534: originator_address, 1);
1.40 markus 1535: xfree(originator_address);
1536: xfree(listen_address);
1537: return c;
1538: }
1539:
1.103 deraadt 1540: static Channel *
1.40 markus 1541: client_request_x11(const char *request_type, int rchan)
1542: {
1543: Channel *c = NULL;
1544: char *originator;
1545: int originator_port;
1.67 markus 1546: int sock;
1.40 markus 1547:
1548: if (!options.forward_x11) {
1549: error("Warning: ssh server tried X11 forwarding.");
1550: error("Warning: this is probably a break in attempt by a malicious server.");
1551: return NULL;
1552: }
1553: originator = packet_get_string(NULL);
1554: if (datafellows & SSH_BUG_X11FWD) {
1555: debug2("buggy server: x11 request w/o originator_port");
1556: originator_port = 0;
1557: } else {
1558: originator_port = packet_get_int();
1559: }
1.93 markus 1560: packet_check_eom();
1.40 markus 1561: /* XXX check permission */
1.47 markus 1562: debug("client_request_x11: request from %s %d", originator,
1563: originator_port);
1.67 markus 1564: xfree(originator);
1.40 markus 1565: sock = x11_connect_display();
1.67 markus 1566: if (sock < 0)
1567: return NULL;
1568: c = channel_new("x11",
1569: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1570: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1571: c->force_drain = 1;
1.40 markus 1572: return c;
1573: }
1574:
1.103 deraadt 1575: static Channel *
1.40 markus 1576: client_request_agent(const char *request_type, int rchan)
1577: {
1578: Channel *c = NULL;
1.67 markus 1579: int sock;
1.40 markus 1580:
1581: if (!options.forward_agent) {
1582: error("Warning: ssh server tried agent forwarding.");
1583: error("Warning: this is probably a break in attempt by a malicious server.");
1584: return NULL;
1585: }
1586: sock = ssh_get_authentication_socket();
1.67 markus 1587: if (sock < 0)
1588: return NULL;
1589: c = channel_new("authentication agent connection",
1590: SSH_CHANNEL_OPEN, sock, sock, -1,
1591: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1592: "authentication agent connection", 1);
1.82 markus 1593: c->force_drain = 1;
1.40 markus 1594: return c;
1595: }
1596:
1.22 markus 1597: /* XXXX move to generic input handler */
1.77 itojun 1598: static void
1.94 markus 1599: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1600: {
1601: Channel *c = NULL;
1602: char *ctype;
1603: int rchan;
1.102 markus 1604: u_int rmaxpack, rwindow, len;
1.22 markus 1605:
1606: ctype = packet_get_string(&len);
1607: rchan = packet_get_int();
1608: rwindow = packet_get_int();
1609: rmaxpack = packet_get_int();
1610:
1.24 markus 1611: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1612: ctype, rchan, rwindow, rmaxpack);
1613:
1.40 markus 1614: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1615: c = client_request_forwarded_tcpip(ctype, rchan);
1616: } else if (strcmp(ctype, "x11") == 0) {
1617: c = client_request_x11(ctype, rchan);
1618: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1619: c = client_request_agent(ctype, rchan);
1.22 markus 1620: }
1621: /* XXX duplicate : */
1622: if (c != NULL) {
1623: debug("confirm %s", ctype);
1624: c->remote_id = rchan;
1625: c->remote_window = rwindow;
1626: c->remote_maxpacket = rmaxpack;
1.69 markus 1627: if (c->type != SSH_CHANNEL_CONNECTING) {
1628: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1629: packet_put_int(c->remote_id);
1630: packet_put_int(c->self);
1631: packet_put_int(c->local_window);
1632: packet_put_int(c->local_maxpacket);
1633: packet_send();
1634: }
1.22 markus 1635: } else {
1636: debug("failure %s", ctype);
1637: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1638: packet_put_int(rchan);
1639: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1640: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1641: packet_put_cstring("open failed");
1.66 markus 1642: packet_put_cstring("");
1643: }
1.22 markus 1644: packet_send();
1645: }
1646: xfree(ctype);
1647: }
1.77 itojun 1648: static void
1.94 markus 1649: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1650: {
1651: Channel *c = NULL;
1.123 djm 1652: int exitval, id, reply, success = 0;
1.48 markus 1653: char *rtype;
1654:
1655: id = packet_get_int();
1656: rtype = packet_get_string(NULL);
1657: reply = packet_get_char();
1658:
1659: debug("client_input_channel_req: channel %d rtype %s reply %d",
1660: id, rtype, reply);
1661:
1.128 djm 1662: if (id == -1) {
1663: error("client_input_channel_req: request for channel -1");
1664: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1665: error("client_input_channel_req: channel %d: unknown channel", id);
1666: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1667: exitval = packet_get_int();
1668: if (id == session_ident) {
1669: success = 1;
1670: exit_status = exitval;
1671: } else if (c->ctl_fd == -1) {
1672: error("client_input_channel_req: unexpected channel %d",
1673: session_ident);
1674: } else {
1675: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1676: success = 1;
1677: }
1.93 markus 1678: packet_check_eom();
1.48 markus 1679: }
1680: if (reply) {
1681: packet_start(success ?
1682: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1683: packet_put_int(id);
1.48 markus 1684: packet_send();
1685: }
1686: xfree(rtype);
1687: }
1.95 markus 1688: static void
1689: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1690: {
1691: char *rtype;
1692: int want_reply;
1693: int success = 0;
1694:
1695: rtype = packet_get_string(NULL);
1696: want_reply = packet_get_char();
1.117 markus 1697: debug("client_input_global_request: rtype %s want_reply %d",
1698: rtype, want_reply);
1.95 markus 1699: if (want_reply) {
1700: packet_start(success ?
1701: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1702: packet_send();
1703: packet_write_wait();
1704: }
1705: xfree(rtype);
1706: }
1.22 markus 1707:
1.123 djm 1708: void
1.129 deraadt 1709: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1710: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1711: dispatch_fn *subsys_repl)
1712: {
1713: int len;
1.132 djm 1714: Channel *c = NULL;
1.123 djm 1715:
1716: debug2("%s: id %d", __func__, id);
1717:
1.132 djm 1718: if ((c = channel_lookup(id)) == NULL)
1719: fatal("client_session2_setup: channel %d: unknown channel", id);
1720:
1.123 djm 1721: if (want_tty) {
1722: struct winsize ws;
1723: struct termios tio;
1724:
1725: /* Store window size in the packet. */
1726: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1727: memset(&ws, 0, sizeof(ws));
1728:
1729: channel_request_start(id, "pty-req", 0);
1730: packet_put_cstring(term != NULL ? term : "");
1731: packet_put_int(ws.ws_col);
1732: packet_put_int(ws.ws_row);
1733: packet_put_int(ws.ws_xpixel);
1734: packet_put_int(ws.ws_ypixel);
1735: tio = get_saved_tio();
1736: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1737: packet_send();
1738: /* XXX wait for reply */
1.132 djm 1739: c->client_tty = 1;
1.123 djm 1740: }
1741:
1742: /* Transfer any environment variables from client to server */
1.126 djm 1743: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1744: int i, j, matched;
1745: char *name, *val;
1746:
1747: debug("Sending environment.");
1.126 djm 1748: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1749: /* Split */
1.126 djm 1750: name = xstrdup(env[i]);
1.123 djm 1751: if ((val = strchr(name, '=')) == NULL) {
1752: free(name);
1753: continue;
1754: }
1755: *val++ = '\0';
1756:
1757: matched = 0;
1758: for (j = 0; j < options.num_send_env; j++) {
1759: if (match_pattern(name, options.send_env[j])) {
1760: matched = 1;
1761: break;
1762: }
1763: }
1764: if (!matched) {
1765: debug3("Ignored env %s", name);
1766: free(name);
1767: continue;
1768: }
1769:
1770: debug("Sending env %s = %s", name, val);
1771: channel_request_start(id, "env", 0);
1772: packet_put_cstring(name);
1773: packet_put_cstring(val);
1774: packet_send();
1775: free(name);
1776: }
1777: }
1778:
1779: len = buffer_len(cmd);
1780: if (len > 0) {
1781: if (len > 900)
1782: len = 900;
1783: if (want_subsystem) {
1784: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1785: channel_request_start(id, "subsystem", subsys_repl != NULL);
1786: if (subsys_repl != NULL) {
1787: /* register callback for reply */
1788: /* XXX we assume that client_loop has already been called */
1789: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1790: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1791: }
1792: } else {
1793: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1794: channel_request_start(id, "exec", 0);
1795: }
1796: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1797: packet_send();
1798: } else {
1799: channel_request_start(id, "shell", 0);
1800: packet_send();
1801: }
1802: }
1803:
1.77 itojun 1804: static void
1.49 itojun 1805: client_init_dispatch_20(void)
1.16 markus 1806: {
1.55 markus 1807: dispatch_init(&dispatch_protocol_error);
1.100 markus 1808:
1.16 markus 1809: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1810: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1811: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1812: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1813: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1814: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1815: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1816: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1817: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1818: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1819:
1820: /* rekeying */
1821: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1822:
1823: /* global request reply messages */
1824: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1825: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1826: }
1.77 itojun 1827: static void
1.49 itojun 1828: client_init_dispatch_13(void)
1.15 markus 1829: {
1830: dispatch_init(NULL);
1831: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1832: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1833: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1834: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1835: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1836: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1837: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1838: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1839: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1840:
1841: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1842: &client_input_agent_open : &deny_input_open);
1.39 markus 1843: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1844: &x11_input_open : &deny_input_open);
1.15 markus 1845: }
1.77 itojun 1846: static void
1.49 itojun 1847: client_init_dispatch_15(void)
1.15 markus 1848: {
1849: client_init_dispatch_13();
1850: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1851: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1852: }
1.79 stevesk 1853: static void
1.49 itojun 1854: client_init_dispatch(void)
1.15 markus 1855: {
1.16 markus 1856: if (compat20)
1857: client_init_dispatch_20();
1858: else if (compat13)
1.15 markus 1859: client_init_dispatch_13();
1860: else
1861: client_init_dispatch_15();
1.113 markus 1862: }
1863:
1864: /* client specific fatal cleanup */
1865: void
1.114 markus 1866: cleanup_exit(int i)
1.113 markus 1867: {
1868: leave_raw_mode();
1869: leave_non_blocking();
1.123 djm 1870: if (options.control_path != NULL && control_fd != -1)
1871: unlink(options.control_path);
1.114 markus 1872: _exit(i);
1.1 deraadt 1873: }
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