Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.134
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"
1.134 ! djm 62: RCSID("$OpenBSD: clientloop.c,v 1.133 2004/10/29 22:53:56 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;
! 630: /* FALLTHROUGH */
! 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);
766: char *s, *cmd;
767: u_short fwd_port, fwd_host_port;
768: char buf[1024], sfwd_port[6], sfwd_host_port[6];
1.121 djm 769: int delete = 0;
1.97 jakob 770: int local = 0;
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) {
816: if (sscanf(s, "%5[0-9]", sfwd_host_port) != 1) {
817: logit("Bad forwarding specification.");
818: goto out;
819: }
820: if ((fwd_host_port = a2port(sfwd_host_port)) == 0) {
821: logit("Bad forwarding port(s).");
822: goto out;
823: }
824: channel_request_rforward_cancel(fwd_host_port);
825: } else {
826: if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]",
827: sfwd_port, buf, sfwd_host_port) != 3 &&
828: sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]",
829: sfwd_port, buf, sfwd_host_port) != 3) {
830: logit("Bad forwarding specification.");
831: goto out;
832: }
833: if ((fwd_port = a2port(sfwd_port)) == 0 ||
834: (fwd_host_port = a2port(sfwd_host_port)) == 0) {
835: logit("Bad forwarding port(s).");
1.97 jakob 836: goto out;
837: }
1.121 djm 838: if (local) {
839: if (channel_setup_local_fwd_listener(fwd_port, buf,
840: fwd_host_port, options.gateway_ports) < 0) {
841: logit("Port forwarding failed.");
842: goto out;
843: }
844: } else
845: channel_request_remote_forwarding(fwd_port, buf,
846: fwd_host_port);
847: logit("Forwarding port.");
848: }
849:
1.97 jakob 850: out:
851: signal(SIGINT, handler);
852: enter_raw_mode();
853: if (cmd)
854: xfree(cmd);
855: }
856:
1.31 markus 857: /* process the characters one by one */
1.77 itojun 858: static int
1.31 markus 859: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
860: {
1.32 markus 861: char string[1024];
1.31 markus 862: pid_t pid;
863: int bytes = 0;
1.42 markus 864: u_int i;
865: u_char ch;
1.31 markus 866: char *s;
867:
868: for (i = 0; i < len; i++) {
869: /* Get one character at a time. */
870: ch = buf[i];
871:
872: if (escape_pending) {
873: /* We have previously seen an escape character. */
874: /* Clear the flag now. */
875: escape_pending = 0;
876:
877: /* Process the escaped character. */
878: switch (ch) {
879: case '.':
880: /* Terminate the connection. */
1.32 markus 881: snprintf(string, sizeof string, "%c.\r\n", escape_char);
882: buffer_append(berr, string, strlen(string));
1.31 markus 883:
884: quit_pending = 1;
885: return -1;
886:
887: case 'Z' - 64:
888: /* Suspend the program. */
889: /* Print a message to that effect to the user. */
1.32 markus 890: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
891: buffer_append(berr, string, strlen(string));
1.31 markus 892:
893: /* Restore terminal modes and suspend. */
894: client_suspend_self(bin, bout, berr);
895:
896: /* We have been continued. */
897: continue;
898:
1.111 markus 899: case 'B':
900: if (compat20) {
901: snprintf(string, sizeof string,
902: "%cB\r\n", escape_char);
903: buffer_append(berr, string,
904: strlen(string));
905: channel_request_start(session_ident,
906: "break", 0);
907: packet_put_int(1000);
908: packet_send();
909: }
910: continue;
911:
1.54 markus 912: case 'R':
1.59 markus 913: if (compat20) {
914: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 915: logit("Server does not support re-keying");
1.59 markus 916: else
917: need_rekeying = 1;
918: }
1.54 markus 919: continue;
920:
1.31 markus 921: case '&':
922: /*
923: * Detach the program (continue to serve connections,
924: * but put in background and no more new connections).
925: */
926: /* Restore tty modes. */
927: leave_raw_mode();
928:
929: /* Stop listening for new connections. */
1.86 markus 930: channel_stop_listening();
1.31 markus 931:
1.86 markus 932: snprintf(string, sizeof string,
933: "%c& [backgrounded]\n", escape_char);
934: buffer_append(berr, string, strlen(string));
1.31 markus 935:
936: /* Fork into background. */
937: pid = fork();
938: if (pid < 0) {
939: error("fork: %.100s", strerror(errno));
940: continue;
941: }
942: if (pid != 0) { /* This is the parent. */
943: /* The parent just exits. */
944: exit(0);
945: }
946: /* The child continues serving connections. */
1.86 markus 947: if (compat20) {
948: buffer_append(bin, "\004", 1);
949: /* fake EOF on stdin */
950: return -1;
951: } else if (!stdin_eof) {
952: /*
953: * Sending SSH_CMSG_EOF alone does not always appear
954: * to be enough. So we try to send an EOF character
955: * first.
956: */
957: packet_start(SSH_CMSG_STDIN_DATA);
958: packet_put_string("\004", 1);
959: packet_send();
960: /* Close stdin. */
961: stdin_eof = 1;
962: if (buffer_len(bin) == 0) {
963: packet_start(SSH_CMSG_EOF);
964: packet_send();
965: }
966: }
967: continue;
1.31 markus 968:
969: case '?':
1.32 markus 970: snprintf(string, sizeof string,
1.31 markus 971: "%c?\r\n\
972: Supported escape sequences:\r\n\
1.104 stevesk 973: %c. - terminate connection\r\n\
1.111 markus 974: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 975: %cC - open a command line\r\n\
976: %cR - Request rekey (SSH protocol 2 only)\r\n\
977: %c^Z - suspend ssh\r\n\
978: %c# - list forwarded connections\r\n\
979: %c& - background ssh (when waiting for connections to terminate)\r\n\
980: %c? - this message\r\n\
981: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 982: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 983: escape_char, escape_char, escape_char, escape_char,
984: escape_char, escape_char, escape_char, escape_char,
1.111 markus 985: escape_char, escape_char, escape_char);
1.32 markus 986: buffer_append(berr, string, strlen(string));
1.31 markus 987: continue;
988:
989: case '#':
1.32 markus 990: snprintf(string, sizeof string, "%c#\r\n", escape_char);
991: buffer_append(berr, string, strlen(string));
1.31 markus 992: s = channel_open_message();
993: buffer_append(berr, s, strlen(s));
994: xfree(s);
1.97 jakob 995: continue;
996:
997: case 'C':
1.99 markus 998: process_cmdline();
1.31 markus 999: continue;
1000:
1001: default:
1002: if (ch != escape_char) {
1003: buffer_put_char(bin, escape_char);
1004: bytes++;
1005: }
1006: /* Escaped characters fall through here */
1007: break;
1008: }
1009: } else {
1010: /*
1011: * The previous character was not an escape char. Check if this
1012: * is an escape.
1013: */
1014: if (last_was_cr && ch == escape_char) {
1015: /* It is. Set the flag and continue to next character. */
1016: escape_pending = 1;
1017: continue;
1018: }
1019: }
1020:
1021: /*
1022: * Normal character. Record whether it was a newline,
1023: * and append it to the buffer.
1024: */
1025: last_was_cr = (ch == '\r' || ch == '\n');
1026: buffer_put_char(bin, ch);
1027: bytes++;
1028: }
1029: return bytes;
1030: }
1031:
1.77 itojun 1032: static void
1.17 markus 1033: client_process_input(fd_set * readset)
1034: {
1.21 deraadt 1035: int len;
1.31 markus 1036: char buf[8192];
1.16 markus 1037:
1.11 markus 1038: /* Read input from stdin. */
1039: if (FD_ISSET(fileno(stdin), readset)) {
1040: /* Read as much as possible. */
1041: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1042: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1043: return; /* we'll try again later */
1.11 markus 1044: if (len <= 0) {
1.13 markus 1045: /*
1046: * Received EOF or error. They are treated
1047: * similarly, except that an error message is printed
1048: * if it was an error condition.
1049: */
1.11 markus 1050: if (len < 0) {
1051: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1052: buffer_append(&stderr_buffer, buf, strlen(buf));
1053: }
1054: /* Mark that we have seen EOF. */
1055: stdin_eof = 1;
1.13 markus 1056: /*
1057: * Send an EOF message to the server unless there is
1058: * data in the buffer. If there is data in the
1059: * buffer, no message will be sent now. Code
1060: * elsewhere will send the EOF when the buffer
1061: * becomes empty if stdin_eof is set.
1062: */
1.11 markus 1063: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1064: packet_start(SSH_CMSG_EOF);
1065: packet_send();
1.11 markus 1066: }
1.72 stevesk 1067: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1068: /*
1069: * Normal successful read, and no escape character.
1070: * Just append the data to buffer.
1071: */
1.11 markus 1072: buffer_append(&stdin_buffer, buf, len);
1073: } else {
1.13 markus 1074: /*
1075: * Normal, successful read. But we have an escape character
1076: * and have to process the characters one by one.
1077: */
1.52 markus 1078: if (process_escapes(&stdin_buffer, &stdout_buffer,
1079: &stderr_buffer, buf, len) == -1)
1.31 markus 1080: return;
1.11 markus 1081: }
1082: }
1083: }
1084:
1.77 itojun 1085: static void
1.11 markus 1086: client_process_output(fd_set * writeset)
1087: {
1088: int len;
1089: char buf[100];
1.1 deraadt 1090:
1.11 markus 1091: /* Write buffered output to stdout. */
1092: if (FD_ISSET(fileno(stdout), writeset)) {
1093: /* Write as much data as possible. */
1094: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1095: buffer_len(&stdout_buffer));
1.11 markus 1096: if (len <= 0) {
1.64 markus 1097: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1098: len = 0;
1099: else {
1.13 markus 1100: /*
1101: * An error or EOF was encountered. Put an
1102: * error message to stderr buffer.
1103: */
1.11 markus 1104: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1105: buffer_append(&stderr_buffer, buf, strlen(buf));
1106: quit_pending = 1;
1107: return;
1108: }
1109: }
1110: /* Consume printed data from the buffer. */
1111: buffer_consume(&stdout_buffer, len);
1.57 markus 1112: stdout_bytes += len;
1.11 markus 1113: }
1114: /* Write buffered output to stderr. */
1115: if (FD_ISSET(fileno(stderr), writeset)) {
1116: /* Write as much data as possible. */
1117: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1118: buffer_len(&stderr_buffer));
1.11 markus 1119: if (len <= 0) {
1.64 markus 1120: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1121: len = 0;
1122: else {
1.13 markus 1123: /* EOF or error, but can't even print error message. */
1.11 markus 1124: quit_pending = 1;
1125: return;
1126: }
1127: }
1128: /* Consume printed characters from the buffer. */
1129: buffer_consume(&stderr_buffer, len);
1.57 markus 1130: stderr_bytes += len;
1.11 markus 1131: }
1.1 deraadt 1132: }
1133:
1.13 markus 1134: /*
1.15 markus 1135: * Get packets from the connection input buffer, and process them as long as
1136: * there are packets available.
1137: *
1138: * Any unknown packets received during the actual
1139: * session cause the session to terminate. This is
1140: * intended to make debugging easier since no
1141: * confirmations are sent. Any compatible protocol
1142: * extensions must be negotiated during the
1143: * preparatory phase.
1144: */
1145:
1.77 itojun 1146: static void
1.49 itojun 1147: client_process_buffered_input_packets(void)
1.15 markus 1148: {
1.54 markus 1149: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1150: }
1151:
1.31 markus 1152: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1153:
1.77 itojun 1154: static int
1.31 markus 1155: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1156: {
1.31 markus 1157: /* XXX we assume c->extended is writeable */
1158: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1159: }
1160:
1.77 itojun 1161: static void
1.60 markus 1162: client_channel_closed(int id, void *arg)
1163: {
1.83 markus 1164: channel_cancel_cleanup(id);
1.60 markus 1165: session_closed = 1;
1.113 markus 1166: leave_raw_mode();
1.60 markus 1167: }
1168:
1.15 markus 1169: /*
1.13 markus 1170: * Implements the interactive session with the server. This is called after
1171: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1172: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1173: * used as an escape character for terminating or suspending the session.
1.13 markus 1174: */
1.1 deraadt 1175:
1.20 markus 1176: int
1.30 markus 1177: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1178: {
1.46 markus 1179: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1180: double start_time, total_time;
1.130 avsm 1181: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1182: u_int nalloc = 0;
1.11 markus 1183: char buf[100];
1184:
1185: debug("Entering interactive session.");
1186:
1187: start_time = get_current_time();
1188:
1189: /* Initialize variables. */
1190: escape_pending = 0;
1191: last_was_cr = 1;
1192: exit_status = -1;
1193: stdin_eof = 0;
1194: buffer_high = 64 * 1024;
1195: connection_in = packet_get_connection_in();
1196: connection_out = packet_get_connection_out();
1.46 markus 1197: max_fd = MAX(connection_in, connection_out);
1.123 djm 1198: if (control_fd != -1)
1199: max_fd = MAX(max_fd, control_fd);
1.46 markus 1200:
1201: if (!compat20) {
1.63 markus 1202: /* enable nonblocking unless tty */
1203: if (!isatty(fileno(stdin)))
1204: set_nonblock(fileno(stdin));
1205: if (!isatty(fileno(stdout)))
1206: set_nonblock(fileno(stdout));
1207: if (!isatty(fileno(stderr)))
1208: set_nonblock(fileno(stderr));
1.46 markus 1209: max_fd = MAX(max_fd, fileno(stdin));
1210: max_fd = MAX(max_fd, fileno(stdout));
1211: max_fd = MAX(max_fd, fileno(stderr));
1212: }
1.11 markus 1213: stdin_bytes = 0;
1214: stdout_bytes = 0;
1215: stderr_bytes = 0;
1216: quit_pending = 0;
1217: escape_char = escape_char_arg;
1218:
1219: /* Initialize buffers. */
1220: buffer_init(&stdin_buffer);
1221: buffer_init(&stdout_buffer);
1222: buffer_init(&stderr_buffer);
1223:
1.15 markus 1224: client_init_dispatch();
1225:
1.105 markus 1226: /*
1227: * Set signal handlers, (e.g. to restore non-blocking mode)
1228: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1229: */
1.131 djm 1230: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1231: signal(SIGHUP, signal_handler);
1.105 markus 1232: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1233: signal(SIGINT, signal_handler);
1234: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1235: signal(SIGQUIT, signal_handler);
1236: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1237: signal(SIGTERM, signal_handler);
1.132 djm 1238: signal(SIGWINCH, window_change_handler);
1.11 markus 1239:
1240: if (have_pty)
1241: enter_raw_mode();
1242:
1.48 markus 1243: if (compat20) {
1244: session_ident = ssh2_chan_id;
1.72 stevesk 1245: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1246: channel_register_filter(session_ident,
1247: simple_escape_filter);
1.60 markus 1248: if (session_ident != -1)
1249: channel_register_cleanup(session_ident,
1250: client_channel_closed);
1.48 markus 1251: } else {
1252: /* Check if we should immediately send eof on stdin. */
1.16 markus 1253: client_check_initial_eof_on_stdin();
1.48 markus 1254: }
1.30 markus 1255:
1.11 markus 1256: /* Main loop of the client for the interactive session mode. */
1257: while (!quit_pending) {
1258:
1.13 markus 1259: /* Process buffered packets sent by the server. */
1.11 markus 1260: client_process_buffered_input_packets();
1261:
1.60 markus 1262: if (compat20 && session_closed && !channel_still_open())
1263: break;
1264:
1.56 markus 1265: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1266:
1.56 markus 1267: if (rekeying) {
1268: debug("rekeying in progress");
1269: } else {
1270: /*
1271: * Make packets of buffered stdin data, and buffer
1272: * them for sending to the server.
1273: */
1274: if (!compat20)
1275: client_make_packets_from_stdin_data();
1.11 markus 1276:
1.56 markus 1277: /*
1278: * Make packets from buffered channel data, and
1279: * enqueue them for sending to the server.
1280: */
1281: if (packet_not_very_much_data_to_write())
1282: channel_output_poll();
1.11 markus 1283:
1.56 markus 1284: /*
1285: * Check if the window size has changed, and buffer a
1286: * message about it to the server if so.
1287: */
1288: client_check_window_change();
1.11 markus 1289:
1.56 markus 1290: if (quit_pending)
1291: break;
1292: }
1.13 markus 1293: /*
1294: * Wait until we have something to do (something becomes
1295: * available on one of the descriptors).
1296: */
1.81 markus 1297: max_fd2 = max_fd;
1.56 markus 1298: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1299: &max_fd2, &nalloc, rekeying);
1.11 markus 1300:
1301: if (quit_pending)
1302: break;
1303:
1.56 markus 1304: /* Do channel operations unless rekeying in progress. */
1305: if (!rekeying) {
1306: channel_after_select(readset, writeset);
1.108 markus 1307: if (need_rekeying || packet_need_rekeying()) {
1308: debug("need rekeying");
1.56 markus 1309: xxx_kex->done = 0;
1310: kex_send_kexinit(xxx_kex);
1311: need_rekeying = 0;
1312: }
1313: }
1.11 markus 1314:
1.17 markus 1315: /* Buffer input from the connection. */
1.46 markus 1316: client_process_net_input(readset);
1.17 markus 1317:
1.123 djm 1318: /* Accept control connections. */
1319: client_process_control(readset);
1320:
1.17 markus 1321: if (quit_pending)
1322: break;
1.11 markus 1323:
1.17 markus 1324: if (!compat20) {
1325: /* Buffer data from stdin */
1.46 markus 1326: client_process_input(readset);
1.17 markus 1327: /*
1328: * Process output to stdout and stderr. Output to
1329: * the connection is processed elsewhere (above).
1330: */
1.46 markus 1331: client_process_output(writeset);
1.17 markus 1332: }
1.11 markus 1333:
1.13 markus 1334: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1335: if (FD_ISSET(connection_out, writeset))
1.11 markus 1336: packet_write_poll();
1337: }
1.46 markus 1338: if (readset)
1339: xfree(readset);
1340: if (writeset)
1341: xfree(writeset);
1.11 markus 1342:
1343: /* Terminate the session. */
1344:
1345: /* Stop watching for window change. */
1.132 djm 1346: signal(SIGWINCH, SIG_DFL);
1.11 markus 1347:
1.76 markus 1348: channel_free_all();
1.11 markus 1349:
1.75 markus 1350: if (have_pty)
1351: leave_raw_mode();
1352:
1353: /* restore blocking io */
1354: if (!isatty(fileno(stdin)))
1355: unset_nonblock(fileno(stdin));
1356: if (!isatty(fileno(stdout)))
1357: unset_nonblock(fileno(stdout));
1358: if (!isatty(fileno(stderr)))
1359: unset_nonblock(fileno(stderr));
1.116 dtucker 1360:
1361: /*
1362: * If there was no shell or command requested, there will be no remote
1363: * exit status to be returned. In that case, clear error code if the
1364: * connection was deliberately terminated at this end.
1365: */
1366: if (no_shell_flag && received_signal == SIGTERM) {
1367: received_signal = 0;
1368: exit_status = 0;
1369: }
1.75 markus 1370:
1.113 markus 1371: if (received_signal)
1.89 itojun 1372: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1373:
1.13 markus 1374: /*
1375: * In interactive mode (with pseudo tty) display a message indicating
1376: * that the connection has been closed.
1377: */
1.11 markus 1378: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1379: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1380: buffer_append(&stderr_buffer, buf, strlen(buf));
1381: }
1.70 markus 1382:
1.11 markus 1383: /* Output any buffered data for stdout. */
1.70 markus 1384: while (buffer_len(&stdout_buffer) > 0) {
1385: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1386: buffer_len(&stdout_buffer));
1.70 markus 1387: if (len <= 0) {
1.11 markus 1388: error("Write failed flushing stdout buffer.");
1.70 markus 1389: break;
1390: }
1.11 markus 1391: buffer_consume(&stdout_buffer, len);
1.57 markus 1392: stdout_bytes += len;
1.11 markus 1393: }
1394:
1395: /* Output any buffered data for stderr. */
1.70 markus 1396: while (buffer_len(&stderr_buffer) > 0) {
1397: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1398: buffer_len(&stderr_buffer));
1.70 markus 1399: if (len <= 0) {
1.11 markus 1400: error("Write failed flushing stderr buffer.");
1.70 markus 1401: break;
1402: }
1.11 markus 1403: buffer_consume(&stderr_buffer, len);
1.57 markus 1404: stderr_bytes += len;
1.11 markus 1405: }
1406:
1407: /* Clear and free any buffers. */
1408: memset(buf, 0, sizeof(buf));
1409: buffer_free(&stdin_buffer);
1410: buffer_free(&stdout_buffer);
1411: buffer_free(&stderr_buffer);
1412:
1413: /* Report bytes transferred, and transfer rates. */
1414: total_time = get_current_time() - start_time;
1415: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1416: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1417: if (total_time > 0)
1418: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1419: stdin_bytes / total_time, stdout_bytes / total_time,
1420: stderr_bytes / total_time);
1.11 markus 1421:
1422: /* Return the exit status of the program. */
1423: debug("Exit status %d", exit_status);
1424: return exit_status;
1.15 markus 1425: }
1426:
1427: /*********/
1428:
1.77 itojun 1429: static void
1.94 markus 1430: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1431: {
1.42 markus 1432: u_int data_len;
1.15 markus 1433: char *data = packet_get_string(&data_len);
1.93 markus 1434: packet_check_eom();
1.15 markus 1435: buffer_append(&stdout_buffer, data, data_len);
1436: memset(data, 0, data_len);
1437: xfree(data);
1438: }
1.77 itojun 1439: static void
1.94 markus 1440: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1441: {
1.42 markus 1442: u_int data_len;
1.15 markus 1443: char *data = packet_get_string(&data_len);
1.93 markus 1444: packet_check_eom();
1.15 markus 1445: buffer_append(&stderr_buffer, data, data_len);
1446: memset(data, 0, data_len);
1447: xfree(data);
1448: }
1.77 itojun 1449: static void
1.94 markus 1450: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1451: {
1452: exit_status = packet_get_int();
1.93 markus 1453: packet_check_eom();
1.15 markus 1454: /* Acknowledge the exit. */
1455: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1456: packet_send();
1457: /*
1458: * Must wait for packet to be sent since we are
1459: * exiting the loop.
1460: */
1461: packet_write_wait();
1462: /* Flag that we want to exit. */
1463: quit_pending = 1;
1464: }
1.115 markus 1465: static void
1466: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1467: {
1468: Channel *c = NULL;
1469: int remote_id, sock;
1470:
1471: /* Read the remote channel number from the message. */
1472: remote_id = packet_get_int();
1473: packet_check_eom();
1474:
1475: /*
1476: * Get a connection to the local authentication agent (this may again
1477: * get forwarded).
1478: */
1479: sock = ssh_get_authentication_socket();
1480:
1481: /*
1482: * If we could not connect the agent, send an error message back to
1483: * the server. This should never happen unless the agent dies,
1484: * because authentication forwarding is only enabled if we have an
1485: * agent.
1486: */
1487: if (sock >= 0) {
1488: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1489: -1, 0, 0, 0, "authentication agent connection", 1);
1490: c->remote_id = remote_id;
1491: c->force_drain = 1;
1492: }
1493: if (c == NULL) {
1494: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1495: packet_put_int(remote_id);
1496: } else {
1497: /* Send a confirmation to the remote host. */
1498: debug("Forwarding authentication connection.");
1499: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1500: packet_put_int(remote_id);
1501: packet_put_int(c->self);
1502: }
1503: packet_send();
1504: }
1.15 markus 1505:
1.77 itojun 1506: static Channel *
1.40 markus 1507: client_request_forwarded_tcpip(const char *request_type, int rchan)
1508: {
1.103 deraadt 1509: Channel *c = NULL;
1.40 markus 1510: char *listen_address, *originator_address;
1511: int listen_port, originator_port;
1.67 markus 1512: int sock;
1.40 markus 1513:
1514: /* Get rest of the packet */
1515: listen_address = packet_get_string(NULL);
1516: listen_port = packet_get_int();
1517: originator_address = packet_get_string(NULL);
1518: originator_port = packet_get_int();
1.93 markus 1519: packet_check_eom();
1.40 markus 1520:
1521: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1522: listen_address, listen_port, originator_address, originator_port);
1523:
1.80 stevesk 1524: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1525: if (sock < 0) {
1526: xfree(originator_address);
1527: xfree(listen_address);
1528: return NULL;
1529: }
1530: c = channel_new("forwarded-tcpip",
1531: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1532: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1533: originator_address, 1);
1.40 markus 1534: xfree(originator_address);
1535: xfree(listen_address);
1536: return c;
1537: }
1538:
1.103 deraadt 1539: static Channel *
1.40 markus 1540: client_request_x11(const char *request_type, int rchan)
1541: {
1542: Channel *c = NULL;
1543: char *originator;
1544: int originator_port;
1.67 markus 1545: int sock;
1.40 markus 1546:
1547: if (!options.forward_x11) {
1548: error("Warning: ssh server tried X11 forwarding.");
1549: error("Warning: this is probably a break in attempt by a malicious server.");
1550: return NULL;
1551: }
1552: originator = packet_get_string(NULL);
1553: if (datafellows & SSH_BUG_X11FWD) {
1554: debug2("buggy server: x11 request w/o originator_port");
1555: originator_port = 0;
1556: } else {
1557: originator_port = packet_get_int();
1558: }
1.93 markus 1559: packet_check_eom();
1.40 markus 1560: /* XXX check permission */
1.47 markus 1561: debug("client_request_x11: request from %s %d", originator,
1562: originator_port);
1.67 markus 1563: xfree(originator);
1.40 markus 1564: sock = x11_connect_display();
1.67 markus 1565: if (sock < 0)
1566: return NULL;
1567: c = channel_new("x11",
1568: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1569: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1570: c->force_drain = 1;
1.40 markus 1571: return c;
1572: }
1573:
1.103 deraadt 1574: static Channel *
1.40 markus 1575: client_request_agent(const char *request_type, int rchan)
1576: {
1577: Channel *c = NULL;
1.67 markus 1578: int sock;
1.40 markus 1579:
1580: if (!options.forward_agent) {
1581: error("Warning: ssh server tried agent forwarding.");
1582: error("Warning: this is probably a break in attempt by a malicious server.");
1583: return NULL;
1584: }
1585: sock = ssh_get_authentication_socket();
1.67 markus 1586: if (sock < 0)
1587: return NULL;
1588: c = channel_new("authentication agent connection",
1589: SSH_CHANNEL_OPEN, sock, sock, -1,
1590: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1591: "authentication agent connection", 1);
1.82 markus 1592: c->force_drain = 1;
1.40 markus 1593: return c;
1594: }
1595:
1.22 markus 1596: /* XXXX move to generic input handler */
1.77 itojun 1597: static void
1.94 markus 1598: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1599: {
1600: Channel *c = NULL;
1601: char *ctype;
1602: int rchan;
1.102 markus 1603: u_int rmaxpack, rwindow, len;
1.22 markus 1604:
1605: ctype = packet_get_string(&len);
1606: rchan = packet_get_int();
1607: rwindow = packet_get_int();
1608: rmaxpack = packet_get_int();
1609:
1.24 markus 1610: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1611: ctype, rchan, rwindow, rmaxpack);
1612:
1.40 markus 1613: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1614: c = client_request_forwarded_tcpip(ctype, rchan);
1615: } else if (strcmp(ctype, "x11") == 0) {
1616: c = client_request_x11(ctype, rchan);
1617: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1618: c = client_request_agent(ctype, rchan);
1.22 markus 1619: }
1620: /* XXX duplicate : */
1621: if (c != NULL) {
1622: debug("confirm %s", ctype);
1623: c->remote_id = rchan;
1624: c->remote_window = rwindow;
1625: c->remote_maxpacket = rmaxpack;
1.69 markus 1626: if (c->type != SSH_CHANNEL_CONNECTING) {
1627: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1628: packet_put_int(c->remote_id);
1629: packet_put_int(c->self);
1630: packet_put_int(c->local_window);
1631: packet_put_int(c->local_maxpacket);
1632: packet_send();
1633: }
1.22 markus 1634: } else {
1635: debug("failure %s", ctype);
1636: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1637: packet_put_int(rchan);
1638: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1639: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1640: packet_put_cstring("open failed");
1.66 markus 1641: packet_put_cstring("");
1642: }
1.22 markus 1643: packet_send();
1644: }
1645: xfree(ctype);
1646: }
1.77 itojun 1647: static void
1.94 markus 1648: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1649: {
1650: Channel *c = NULL;
1.123 djm 1651: int exitval, id, reply, success = 0;
1.48 markus 1652: char *rtype;
1653:
1654: id = packet_get_int();
1655: rtype = packet_get_string(NULL);
1656: reply = packet_get_char();
1657:
1658: debug("client_input_channel_req: channel %d rtype %s reply %d",
1659: id, rtype, reply);
1660:
1.128 djm 1661: if (id == -1) {
1662: error("client_input_channel_req: request for channel -1");
1663: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1664: error("client_input_channel_req: channel %d: unknown channel", id);
1665: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1666: exitval = packet_get_int();
1667: if (id == session_ident) {
1668: success = 1;
1669: exit_status = exitval;
1670: } else if (c->ctl_fd == -1) {
1671: error("client_input_channel_req: unexpected channel %d",
1672: session_ident);
1673: } else {
1674: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1675: success = 1;
1676: }
1.93 markus 1677: packet_check_eom();
1.48 markus 1678: }
1679: if (reply) {
1680: packet_start(success ?
1681: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1682: packet_put_int(id);
1.48 markus 1683: packet_send();
1684: }
1685: xfree(rtype);
1686: }
1.95 markus 1687: static void
1688: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1689: {
1690: char *rtype;
1691: int want_reply;
1692: int success = 0;
1693:
1694: rtype = packet_get_string(NULL);
1695: want_reply = packet_get_char();
1.117 markus 1696: debug("client_input_global_request: rtype %s want_reply %d",
1697: rtype, want_reply);
1.95 markus 1698: if (want_reply) {
1699: packet_start(success ?
1700: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1701: packet_send();
1702: packet_write_wait();
1703: }
1704: xfree(rtype);
1705: }
1.22 markus 1706:
1.123 djm 1707: void
1.129 deraadt 1708: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1709: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1710: dispatch_fn *subsys_repl)
1711: {
1712: int len;
1.132 djm 1713: Channel *c = NULL;
1.123 djm 1714:
1715: debug2("%s: id %d", __func__, id);
1716:
1.132 djm 1717: if ((c = channel_lookup(id)) == NULL)
1718: fatal("client_session2_setup: channel %d: unknown channel", id);
1719:
1.123 djm 1720: if (want_tty) {
1721: struct winsize ws;
1722: struct termios tio;
1723:
1724: /* Store window size in the packet. */
1725: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1726: memset(&ws, 0, sizeof(ws));
1727:
1728: channel_request_start(id, "pty-req", 0);
1729: packet_put_cstring(term != NULL ? term : "");
1730: packet_put_int(ws.ws_col);
1731: packet_put_int(ws.ws_row);
1732: packet_put_int(ws.ws_xpixel);
1733: packet_put_int(ws.ws_ypixel);
1734: tio = get_saved_tio();
1735: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1736: packet_send();
1737: /* XXX wait for reply */
1.132 djm 1738: c->client_tty = 1;
1.123 djm 1739: }
1740:
1741: /* Transfer any environment variables from client to server */
1.126 djm 1742: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1743: int i, j, matched;
1744: char *name, *val;
1745:
1746: debug("Sending environment.");
1.126 djm 1747: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1748: /* Split */
1.126 djm 1749: name = xstrdup(env[i]);
1.123 djm 1750: if ((val = strchr(name, '=')) == NULL) {
1751: free(name);
1752: continue;
1753: }
1754: *val++ = '\0';
1755:
1756: matched = 0;
1757: for (j = 0; j < options.num_send_env; j++) {
1758: if (match_pattern(name, options.send_env[j])) {
1759: matched = 1;
1760: break;
1761: }
1762: }
1763: if (!matched) {
1764: debug3("Ignored env %s", name);
1765: free(name);
1766: continue;
1767: }
1768:
1769: debug("Sending env %s = %s", name, val);
1770: channel_request_start(id, "env", 0);
1771: packet_put_cstring(name);
1772: packet_put_cstring(val);
1773: packet_send();
1774: free(name);
1775: }
1776: }
1777:
1778: len = buffer_len(cmd);
1779: if (len > 0) {
1780: if (len > 900)
1781: len = 900;
1782: if (want_subsystem) {
1783: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1784: channel_request_start(id, "subsystem", subsys_repl != NULL);
1785: if (subsys_repl != NULL) {
1786: /* register callback for reply */
1787: /* XXX we assume that client_loop has already been called */
1788: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1789: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1790: }
1791: } else {
1792: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1793: channel_request_start(id, "exec", 0);
1794: }
1795: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1796: packet_send();
1797: } else {
1798: channel_request_start(id, "shell", 0);
1799: packet_send();
1800: }
1801: }
1802:
1.77 itojun 1803: static void
1.49 itojun 1804: client_init_dispatch_20(void)
1.16 markus 1805: {
1.55 markus 1806: dispatch_init(&dispatch_protocol_error);
1.100 markus 1807:
1.16 markus 1808: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1809: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1810: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1811: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1812: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1813: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1814: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1815: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1816: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1817: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1818:
1819: /* rekeying */
1820: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1821:
1822: /* global request reply messages */
1823: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1824: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1825: }
1.77 itojun 1826: static void
1.49 itojun 1827: client_init_dispatch_13(void)
1.15 markus 1828: {
1829: dispatch_init(NULL);
1830: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1831: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1832: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1833: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1834: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1835: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1836: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1837: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1838: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1839:
1840: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1841: &client_input_agent_open : &deny_input_open);
1.39 markus 1842: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1843: &x11_input_open : &deny_input_open);
1.15 markus 1844: }
1.77 itojun 1845: static void
1.49 itojun 1846: client_init_dispatch_15(void)
1.15 markus 1847: {
1848: client_init_dispatch_13();
1849: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1850: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1851: }
1.79 stevesk 1852: static void
1.49 itojun 1853: client_init_dispatch(void)
1.15 markus 1854: {
1.16 markus 1855: if (compat20)
1856: client_init_dispatch_20();
1857: else if (compat13)
1.15 markus 1858: client_init_dispatch_13();
1859: else
1860: client_init_dispatch_15();
1.113 markus 1861: }
1862:
1863: /* client specific fatal cleanup */
1864: void
1.114 markus 1865: cleanup_exit(int i)
1.113 markus 1866: {
1867: leave_raw_mode();
1868: leave_non_blocking();
1.123 djm 1869: if (options.control_path != NULL && control_fd != -1)
1870: unlink(options.control_path);
1.114 markus 1871: _exit(i);
1.1 deraadt 1872: }
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