Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.219
1.219 ! djm 1: /* $OpenBSD: clientloop.c,v 1.218 2010/01/28 00:21:18 djm Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.172 stevesk 68: #include <sys/param.h>
1.189 djm 69: #include <sys/queue.h>
1.150 stevesk 70:
1.155 stevesk 71: #include <ctype.h>
1.168 stevesk 72: #include <errno.h>
1.151 stevesk 73: #include <paths.h>
1.153 stevesk 74: #include <signal.h>
1.174 stevesk 75: #include <stdio.h>
1.173 stevesk 76: #include <stdlib.h>
1.170 stevesk 77: #include <string.h>
1.150 stevesk 78: #include <termios.h>
1.175 deraadt 79: #include <pwd.h>
1.169 stevesk 80: #include <unistd.h>
1.1 deraadt 81:
1.175 deraadt 82: #include "xmalloc.h"
1.45 markus 83: #include "ssh.h"
84: #include "ssh1.h"
85: #include "ssh2.h"
1.1 deraadt 86: #include "packet.h"
87: #include "buffer.h"
1.15 markus 88: #include "compat.h"
1.74 markus 89: #include "channels.h"
1.15 markus 90: #include "dispatch.h"
1.40 markus 91: #include "key.h"
1.175 deraadt 92: #include "cipher.h"
1.54 markus 93: #include "kex.h"
1.45 markus 94: #include "log.h"
95: #include "readconf.h"
96: #include "clientloop.h"
1.147 djm 97: #include "sshconnect.h"
1.40 markus 98: #include "authfd.h"
1.45 markus 99: #include "atomicio.h"
1.118 deraadt 100: #include "sshpty.h"
1.63 markus 101: #include "misc.h"
1.123 djm 102: #include "match.h"
103: #include "msg.h"
1.212 andreas 104: #include "roaming.h"
1.39 markus 105:
106: /* import options */
107: extern Options options;
108:
1.1 deraadt 109: /* Flag indicating that stdin should be redirected from /dev/null. */
110: extern int stdin_null_flag;
111:
1.116 dtucker 112: /* Flag indicating that no shell has been requested */
113: extern int no_shell_flag;
114:
1.123 djm 115: /* Control socket */
1.217 djm 116: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 117:
1.13 markus 118: /*
119: * Name of the host we are connecting to. This is the name given on the
120: * command line, or the HostName specified for the user-supplied name in a
121: * configuration file.
122: */
1.1 deraadt 123: extern char *host;
124:
1.216 djm 125: /* Force TTY allocation */
126: extern int force_tty_flag;
127:
1.13 markus 128: /*
129: * Flag to indicate that we have received a window change signal which has
130: * not yet been processed. This will cause a message indicating the new
131: * window size to be sent to the server a little later. This is volatile
132: * because this is updated in a signal handler.
133: */
1.88 markus 134: static volatile sig_atomic_t received_window_change_signal = 0;
135: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 136:
1.145 djm 137: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 138: static int in_non_blocking_mode = 0;
139:
140: /* Common data for the client loop code. */
1.217 djm 141: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.195 djm 142: static int escape_char1; /* Escape character. (proto1 only) */
143: static int escape_pending1; /* Last character was an escape (proto1 only) */
1.11 markus 144: static int last_was_cr; /* Last character was a newline. */
1.197 djm 145: static int exit_status; /* Used to store the command exit status. */
146: static int stdin_eof; /* EOF has been encountered on stderr. */
1.11 markus 147: static Buffer stdin_buffer; /* Buffer for stdin data. */
148: static Buffer stdout_buffer; /* Buffer for stdout data. */
149: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 150: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 151: static int connection_in; /* Connection to server (input). */
152: static int connection_out; /* Connection to server (output). */
1.56 markus 153: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 154: static int session_closed = 0; /* In SSH2: login session closed. */
1.1 deraadt 155:
1.77 itojun 156: static void client_init_dispatch(void);
1.16 markus 157: int session_ident = -1;
158:
1.214 andreas 159: int session_resumed = 0;
160:
1.195 djm 161: /* Track escape per proto2 channel */
162: struct escape_filter_ctx {
163: int escape_pending;
164: int escape_char;
165: };
166:
167: /* Context for channel confirmation replies */
1.190 djm 168: struct channel_reply_ctx {
169: const char *request_type;
170: int id, do_close;
171: };
172:
1.196 djm 173: /* Global request success/failure callbacks */
174: struct global_confirm {
175: TAILQ_ENTRY(global_confirm) entry;
176: global_confirm_cb *cb;
177: void *ctx;
178: int ref_count;
179: };
180: TAILQ_HEAD(global_confirms, global_confirm);
181: static struct global_confirms global_confirms =
182: TAILQ_HEAD_INITIALIZER(global_confirms);
183:
1.54 markus 184: /*XXX*/
185: extern Kex *xxx_kex;
186:
1.123 djm 187: void ssh_process_session2_setup(int, int, int, Buffer *);
188:
1.1 deraadt 189: /* Restores stdin to blocking mode. */
190:
1.77 itojun 191: static void
1.49 itojun 192: leave_non_blocking(void)
1.1 deraadt 193: {
1.11 markus 194: if (in_non_blocking_mode) {
1.125 djm 195: unset_nonblock(fileno(stdin));
1.11 markus 196: in_non_blocking_mode = 0;
197: }
1.1 deraadt 198: }
199:
1.11 markus 200: /* Puts stdin terminal in non-blocking mode. */
201:
1.77 itojun 202: static void
1.49 itojun 203: enter_non_blocking(void)
1.1 deraadt 204: {
1.11 markus 205: in_non_blocking_mode = 1;
1.124 djm 206: set_nonblock(fileno(stdin));
1.1 deraadt 207: }
208:
1.13 markus 209: /*
210: * Signal handler for the window change signal (SIGWINCH). This just sets a
211: * flag indicating that the window has changed.
212: */
1.157 deraadt 213: /*ARGSUSED */
1.77 itojun 214: static void
1.11 markus 215: window_change_handler(int sig)
1.1 deraadt 216: {
1.11 markus 217: received_window_change_signal = 1;
218: signal(SIGWINCH, window_change_handler);
1.1 deraadt 219: }
220:
1.13 markus 221: /*
222: * Signal handler for signals that cause the program to terminate. These
223: * signals must be trapped to restore terminal modes.
224: */
1.157 deraadt 225: /*ARGSUSED */
1.77 itojun 226: static void
1.11 markus 227: signal_handler(int sig)
1.1 deraadt 228: {
1.75 markus 229: received_signal = sig;
230: quit_pending = 1;
1.1 deraadt 231: }
232:
1.13 markus 233: /*
234: * Returns current time in seconds from Jan 1, 1970 with the maximum
235: * available resolution.
236: */
1.1 deraadt 237:
1.77 itojun 238: static double
1.49 itojun 239: get_current_time(void)
1.1 deraadt 240: {
1.11 markus 241: struct timeval tv;
242: gettimeofday(&tv, NULL);
243: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 244: }
245:
246: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
247: void
248: client_x11_get_proto(const char *display, const char *xauth_path,
249: u_int trusted, char **_proto, char **_data)
250: {
251: char cmd[1024];
252: char line[512];
253: char xdisplay[512];
254: static char proto[512], data[512];
255: FILE *f;
256: int got_data = 0, generated = 0, do_unlink = 0, i;
257: char *xauthdir, *xauthfile;
258: struct stat st;
259:
260: xauthdir = xauthfile = NULL;
261: *_proto = proto;
262: *_data = data;
263: proto[0] = data[0] = '\0';
264:
265: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
266: debug("No xauth program.");
267: } else {
268: if (display == NULL) {
269: debug("x11_get_proto: DISPLAY not set");
270: return;
271: }
272: /*
273: * Handle FamilyLocal case where $DISPLAY does
274: * not match an authorization entry. For this we
275: * just try "xauth list unix:displaynum.screennum".
276: * XXX: "localhost" match to determine FamilyLocal
277: * is not perfect.
278: */
279: if (strncmp(display, "localhost:", 10) == 0) {
280: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
281: display + 10);
282: display = xdisplay;
283: }
284: if (trusted == 0) {
285: xauthdir = xmalloc(MAXPATHLEN);
286: xauthfile = xmalloc(MAXPATHLEN);
287: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
288: if (mkdtemp(xauthdir) != NULL) {
289: do_unlink = 1;
290: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
291: xauthdir);
292: snprintf(cmd, sizeof(cmd),
293: "%s -f %s generate %s " SSH_X11_PROTO
294: " untrusted timeout 1200 2>" _PATH_DEVNULL,
295: xauth_path, xauthfile, display);
296: debug2("x11_get_proto: %s", cmd);
297: if (system(cmd) == 0)
298: generated = 1;
299: }
300: }
1.181 markus 301:
302: /*
303: * When in untrusted mode, we read the cookie only if it was
304: * successfully generated as an untrusted one in the step
305: * above.
306: */
307: if (trusted || generated) {
308: snprintf(cmd, sizeof(cmd),
309: "%s %s%s list %s 2>" _PATH_DEVNULL,
310: xauth_path,
311: generated ? "-f " : "" ,
312: generated ? xauthfile : "",
313: display);
314: debug2("x11_get_proto: %s", cmd);
315: f = popen(cmd, "r");
316: if (f && fgets(line, sizeof(line), f) &&
317: sscanf(line, "%*s %511s %511s", proto, data) == 2)
318: got_data = 1;
319: if (f)
320: pclose(f);
321: } else
322: error("Warning: untrusted X11 forwarding setup failed: "
323: "xauth key data not generated");
1.138 djm 324: }
325:
326: if (do_unlink) {
327: unlink(xauthfile);
328: rmdir(xauthdir);
329: }
330: if (xauthdir)
331: xfree(xauthdir);
332: if (xauthfile)
333: xfree(xauthfile);
334:
335: /*
336: * If we didn't get authentication data, just make up some
337: * data. The forwarding code will check the validity of the
338: * response anyway, and substitute this data. The X11
339: * server, however, will ignore this fake data and use
340: * whatever authentication mechanisms it was using otherwise
341: * for the local connection.
342: */
343: if (!got_data) {
344: u_int32_t rnd = 0;
345:
346: logit("Warning: No xauth data; "
347: "using fake authentication data for X11 forwarding.");
348: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
349: for (i = 0; i < 16; i++) {
350: if (i % 4 == 0)
351: rnd = arc4random();
352: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
353: rnd & 0xff);
354: rnd >>= 8;
355: }
356: }
1.1 deraadt 357: }
358:
1.13 markus 359: /*
360: * This is called when the interactive is entered. This checks if there is
361: * an EOF coming on stdin. We must check this explicitly, as select() does
362: * not appear to wake up when redirecting from /dev/null.
363: */
1.1 deraadt 364:
1.77 itojun 365: static void
1.49 itojun 366: client_check_initial_eof_on_stdin(void)
1.1 deraadt 367: {
1.11 markus 368: int len;
369: char buf[1];
1.1 deraadt 370:
1.13 markus 371: /*
372: * If standard input is to be "redirected from /dev/null", we simply
373: * mark that we have seen an EOF and send an EOF message to the
374: * server. Otherwise, we try to read a single character; it appears
375: * that for some files, such /dev/null, select() never wakes up for
376: * read for this descriptor, which means that we never get EOF. This
377: * way we will get the EOF if stdin comes from /dev/null or similar.
378: */
1.11 markus 379: if (stdin_null_flag) {
380: /* Fake EOF on stdin. */
381: debug("Sending eof.");
382: stdin_eof = 1;
383: packet_start(SSH_CMSG_EOF);
384: packet_send();
385: } else {
386: enter_non_blocking();
387:
388: /* Check for immediate EOF on stdin. */
389: len = read(fileno(stdin), buf, 1);
390: if (len == 0) {
1.197 djm 391: /*
392: * EOF. Record that we have seen it and send
393: * EOF to server.
394: */
1.11 markus 395: debug("Sending eof.");
396: stdin_eof = 1;
397: packet_start(SSH_CMSG_EOF);
398: packet_send();
399: } else if (len > 0) {
1.13 markus 400: /*
401: * Got data. We must store the data in the buffer,
402: * and also process it as an escape character if
403: * appropriate.
404: */
1.195 djm 405: if ((u_char) buf[0] == escape_char1)
406: escape_pending1 = 1;
1.52 markus 407: else
1.11 markus 408: buffer_append(&stdin_buffer, buf, 1);
409: }
410: leave_non_blocking();
411: }
1.1 deraadt 412: }
413:
414:
1.13 markus 415: /*
416: * Make packets from buffered stdin data, and buffer them for sending to the
417: * connection.
418: */
1.1 deraadt 419:
1.77 itojun 420: static void
1.49 itojun 421: client_make_packets_from_stdin_data(void)
1.1 deraadt 422: {
1.42 markus 423: u_int len;
1.1 deraadt 424:
1.11 markus 425: /* Send buffered stdin data to the server. */
426: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 427: packet_not_very_much_data_to_write()) {
1.11 markus 428: len = buffer_len(&stdin_buffer);
429: /* Keep the packets at reasonable size. */
430: if (len > packet_get_maxsize())
431: len = packet_get_maxsize();
432: packet_start(SSH_CMSG_STDIN_DATA);
433: packet_put_string(buffer_ptr(&stdin_buffer), len);
434: packet_send();
435: buffer_consume(&stdin_buffer, len);
436: /* If we have a pending EOF, send it now. */
437: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
438: packet_start(SSH_CMSG_EOF);
439: packet_send();
440: }
1.1 deraadt 441: }
442: }
443:
1.13 markus 444: /*
445: * Checks if the client window has changed, and sends a packet about it to
446: * the server if so. The actual change is detected elsewhere (by a software
447: * interrupt on Unix); this just checks the flag and sends a message if
448: * appropriate.
449: */
1.1 deraadt 450:
1.77 itojun 451: static void
1.49 itojun 452: client_check_window_change(void)
1.1 deraadt 453: {
1.16 markus 454: struct winsize ws;
455:
456: if (! received_window_change_signal)
457: return;
458: /** XXX race */
459: received_window_change_signal = 0;
460:
1.37 markus 461: debug2("client_check_window_change: changed");
1.16 markus 462:
463: if (compat20) {
1.123 djm 464: channel_send_window_changes();
1.16 markus 465: } else {
1.123 djm 466: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
467: return;
1.16 markus 468: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 469: packet_put_int((u_int)ws.ws_row);
470: packet_put_int((u_int)ws.ws_col);
471: packet_put_int((u_int)ws.ws_xpixel);
472: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 473: packet_send();
1.1 deraadt 474: }
475: }
476:
1.117 markus 477: static void
478: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
479: {
1.196 djm 480: struct global_confirm *gc;
481:
482: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
483: return;
484: if (gc->cb != NULL)
485: gc->cb(type, seq, gc->ctx);
486: if (--gc->ref_count <= 0) {
487: TAILQ_REMOVE(&global_confirms, gc, entry);
488: bzero(gc, sizeof(*gc));
489: xfree(gc);
490: }
491:
1.210 andreas 492: packet_set_alive_timeouts(0);
1.117 markus 493: }
494:
495: static void
496: server_alive_check(void)
497: {
1.210 andreas 498: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.176 markus 499: logit("Timeout, server not responding.");
500: cleanup_exit(255);
501: }
1.117 markus 502: packet_start(SSH2_MSG_GLOBAL_REQUEST);
503: packet_put_cstring("keepalive@openssh.com");
504: packet_put_char(1); /* boolean: want reply */
505: packet_send();
1.196 djm 506: /* Insert an empty placeholder to maintain ordering */
507: client_register_global_confirm(NULL, NULL);
1.117 markus 508: }
509:
1.13 markus 510: /*
511: * Waits until the client can do something (some data becomes available on
512: * one of the file descriptors).
513: */
1.77 itojun 514: static void
1.46 markus 515: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 516: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 517: {
1.117 markus 518: struct timeval tv, *tvp;
519: int ret;
520:
1.46 markus 521: /* Add any selections by the channel mechanism. */
1.81 markus 522: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 523:
1.16 markus 524: if (!compat20) {
1.17 markus 525: /* Read from the connection, unless our buffers are full. */
1.16 markus 526: if (buffer_len(&stdout_buffer) < buffer_high &&
527: buffer_len(&stderr_buffer) < buffer_high &&
528: channel_not_very_much_buffered_data())
1.46 markus 529: FD_SET(connection_in, *readsetp);
1.17 markus 530: /*
531: * Read from stdin, unless we have seen EOF or have very much
532: * buffered data to send to the server.
533: */
534: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 535: FD_SET(fileno(stdin), *readsetp);
1.17 markus 536:
537: /* Select stdout/stderr if have data in buffer. */
538: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 539: FD_SET(fileno(stdout), *writesetp);
1.17 markus 540: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 541: FD_SET(fileno(stderr), *writesetp);
1.16 markus 542: } else {
1.71 markus 543: /* channel_prepare_select could have closed the last channel */
1.84 markus 544: if (session_closed && !channel_still_open() &&
545: !packet_have_data_to_write()) {
546: /* clear mask since we did not call select() */
1.87 markus 547: memset(*readsetp, 0, *nallocp);
548: memset(*writesetp, 0, *nallocp);
1.84 markus 549: return;
1.71 markus 550: } else {
551: FD_SET(connection_in, *readsetp);
552: }
1.16 markus 553: }
1.11 markus 554:
555: /* Select server connection if have data to write to the server. */
556: if (packet_have_data_to_write())
1.46 markus 557: FD_SET(connection_out, *writesetp);
1.11 markus 558:
1.13 markus 559: /*
560: * Wait for something to happen. This will suspend the process until
561: * some selected descriptor can be read, written, or has some other
1.117 markus 562: * event pending.
1.13 markus 563: */
1.11 markus 564:
1.117 markus 565: if (options.server_alive_interval == 0 || !compat20)
566: tvp = NULL;
1.129 deraadt 567: else {
1.117 markus 568: tv.tv_sec = options.server_alive_interval;
569: tv.tv_usec = 0;
570: tvp = &tv;
571: }
572: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
573: if (ret < 0) {
1.11 markus 574: char buf[100];
1.51 markus 575:
576: /*
577: * We have to clear the select masks, because we return.
578: * We have to return, because the mainloop checks for the flags
579: * set by the signal handlers.
580: */
1.87 markus 581: memset(*readsetp, 0, *nallocp);
582: memset(*writesetp, 0, *nallocp);
1.50 deraadt 583:
1.11 markus 584: if (errno == EINTR)
585: return;
586: /* Note: we might still have data in the buffers. */
587: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
588: buffer_append(&stderr_buffer, buf, strlen(buf));
589: quit_pending = 1;
1.117 markus 590: } else if (ret == 0)
591: server_alive_check();
1.11 markus 592: }
593:
1.77 itojun 594: static void
1.31 markus 595: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 596: {
1.11 markus 597: /* Flush stdout and stderr buffers. */
1.31 markus 598: if (buffer_len(bout) > 0)
1.197 djm 599: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
600: buffer_len(bout));
1.31 markus 601: if (buffer_len(berr) > 0)
1.197 djm 602: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
603: buffer_len(berr));
1.11 markus 604:
1.216 djm 605: leave_raw_mode(force_tty_flag);
1.11 markus 606:
1.13 markus 607: /*
608: * Free (and clear) the buffer to reduce the amount of data that gets
609: * written to swap.
610: */
1.31 markus 611: buffer_free(bin);
612: buffer_free(bout);
613: buffer_free(berr);
1.11 markus 614:
615: /* Send the suspend signal to the program itself. */
616: kill(getpid(), SIGTSTP);
617:
1.132 djm 618: /* Reset window sizes in case they have changed */
619: received_window_change_signal = 1;
1.11 markus 620:
621: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 622: buffer_init(bin);
623: buffer_init(bout);
624: buffer_init(berr);
1.11 markus 625:
1.216 djm 626: enter_raw_mode(force_tty_flag);
1.11 markus 627: }
628:
1.77 itojun 629: static void
1.161 deraadt 630: client_process_net_input(fd_set *readset)
1.11 markus 631: {
1.212 andreas 632: int len, cont = 0;
1.17 markus 633: char buf[8192];
1.11 markus 634:
1.13 markus 635: /*
636: * Read input from the server, and add any such data to the buffer of
637: * the packet subsystem.
638: */
1.11 markus 639: if (FD_ISSET(connection_in, readset)) {
640: /* Read as much as possible. */
1.212 andreas 641: len = roaming_read(connection_in, buf, sizeof(buf), &cont);
642: if (len == 0 && cont == 0) {
1.197 djm 643: /*
644: * Received EOF. The remote host has closed the
645: * connection.
646: */
647: snprintf(buf, sizeof buf,
648: "Connection to %.300s closed by remote host.\r\n",
649: host);
1.1 deraadt 650: buffer_append(&stderr_buffer, buf, strlen(buf));
651: quit_pending = 1;
652: return;
1.11 markus 653: }
1.13 markus 654: /*
655: * There is a kernel bug on Solaris that causes select to
656: * sometimes wake up even though there is no data available.
657: */
1.53 millert 658: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 659: len = 0;
660:
661: if (len < 0) {
1.197 djm 662: /*
663: * An error has encountered. Perhaps there is a
664: * network problem.
665: */
666: snprintf(buf, sizeof buf,
667: "Read from remote host %.300s: %.100s\r\n",
668: host, strerror(errno));
1.11 markus 669: buffer_append(&stderr_buffer, buf, strlen(buf));
670: quit_pending = 1;
671: return;
672: }
673: packet_process_incoming(buf, len);
674: }
1.17 markus 675: }
1.16 markus 676:
1.97 jakob 677: static void
1.190 djm 678: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 679: {
1.190 djm 680: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
681: char errmsg[256];
682: int tochan;
683:
684: /* XXX supress on mux _client_ quietmode */
685: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 686: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 687:
688: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
689: debug2("%s request accepted on channel %d",
690: cr->request_type, c->self);
691: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
692: if (tochan) {
693: snprintf(errmsg, sizeof(errmsg),
694: "%s request failed\r\n", cr->request_type);
695: } else {
696: snprintf(errmsg, sizeof(errmsg),
697: "%s request failed on channel %d",
698: cr->request_type, c->self);
699: }
700: /* If error occurred on primary session channel, then exit */
701: if (cr->do_close && c->self == session_ident)
702: fatal("%s", errmsg);
703: /* If error occurred on mux client, append to their stderr */
704: if (tochan)
705: buffer_append(&c->extended, errmsg, strlen(errmsg));
706: else
707: error("%s", errmsg);
708: if (cr->do_close) {
709: chan_read_failed(c);
710: chan_write_failed(c);
711: }
712: }
713: xfree(cr);
714: }
715:
716: static void
717: client_abandon_status_confirm(Channel *c, void *ctx)
718: {
719: xfree(ctx);
720: }
1.129 deraadt 721:
1.190 djm 722: static void
723: client_expect_confirm(int id, const char *request, int do_close)
724: {
725: struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
1.123 djm 726:
1.190 djm 727: cr->request_type = request;
728: cr->do_close = do_close;
1.123 djm 729:
1.190 djm 730: channel_register_status_confirm(id, client_status_confirm,
731: client_abandon_status_confirm, cr);
1.196 djm 732: }
733:
734: void
735: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
736: {
1.201 djm 737: struct global_confirm *gc, *last_gc;
1.196 djm 738:
739: /* Coalesce identical callbacks */
1.201 djm 740: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
741: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
742: if (++last_gc->ref_count >= INT_MAX)
743: fatal("%s: last_gc->ref_count = %d",
744: __func__, last_gc->ref_count);
1.196 djm 745: return;
746: }
747:
748: gc = xmalloc(sizeof(*gc));
749: gc->cb = cb;
750: gc->ctx = ctx;
751: gc->ref_count = 1;
752: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 753: }
754:
755: static void
1.99 markus 756: process_cmdline(void)
1.97 jakob 757: {
758: void (*handler)(int);
1.135 djm 759: char *s, *cmd, *cancel_host;
1.121 djm 760: int delete = 0;
1.204 stevesk 761: int local = 0, remote = 0, dynamic = 0;
1.208 djm 762: int cancel_port;
1.135 djm 763: Forward fwd;
1.97 jakob 764:
1.183 djm 765: bzero(&fwd, sizeof(fwd));
766: fwd.listen_host = fwd.connect_host = NULL;
767:
1.216 djm 768: leave_raw_mode(force_tty_flag);
1.101 markus 769: handler = signal(SIGINT, SIG_IGN);
1.99 markus 770: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 771: if (s == NULL)
772: goto out;
1.179 tedu 773: while (isspace(*s))
1.97 jakob 774: s++;
1.121 djm 775: if (*s == '-')
776: s++; /* Skip cmdline '-', if any */
1.120 dtucker 777: if (*s == '\0')
1.97 jakob 778: goto out;
1.121 djm 779:
1.122 djm 780: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 781: logit("Commands:");
1.164 djm 782: logit(" -L[bind_address:]port:host:hostport "
783: "Request local forward");
784: logit(" -R[bind_address:]port:host:hostport "
785: "Request remote forward");
1.204 stevesk 786: logit(" -D[bind_address:]port "
787: "Request dynamic forward");
1.165 stevesk 788: logit(" -KR[bind_address:]port "
1.164 djm 789: "Cancel remote forward");
1.146 reyk 790: if (!options.permit_local_command)
791: goto out;
1.164 djm 792: logit(" !args "
793: "Execute local command");
1.146 reyk 794: goto out;
795: }
796:
797: if (*s == '!' && options.permit_local_command) {
798: s++;
799: ssh_local_cmd(s);
1.121 djm 800: goto out;
801: }
802:
803: if (*s == 'K') {
804: delete = 1;
805: s++;
806: }
1.204 stevesk 807: if (*s == 'L')
808: local = 1;
809: else if (*s == 'R')
810: remote = 1;
811: else if (*s == 'D')
812: dynamic = 1;
813: else {
1.109 itojun 814: logit("Invalid command.");
1.97 jakob 815: goto out;
816: }
1.204 stevesk 817:
818: if ((local || dynamic) && delete) {
1.121 djm 819: logit("Not supported.");
820: goto out;
821: }
1.204 stevesk 822: if (remote && delete && !compat20) {
1.109 itojun 823: logit("Not supported for SSH protocol version 1.");
1.97 jakob 824: goto out;
825: }
1.121 djm 826:
1.179 tedu 827: while (isspace(*++s))
828: ;
1.97 jakob 829:
1.217 djm 830: /* XXX update list of forwards in options */
1.121 djm 831: if (delete) {
1.135 djm 832: cancel_port = 0;
833: cancel_host = hpdelim(&s); /* may be NULL */
834: if (s != NULL) {
835: cancel_port = a2port(s);
836: cancel_host = cleanhostname(cancel_host);
837: } else {
838: cancel_port = a2port(cancel_host);
839: cancel_host = NULL;
1.121 djm 840: }
1.208 djm 841: if (cancel_port <= 0) {
1.135 djm 842: logit("Bad forwarding close port");
1.121 djm 843: goto out;
844: }
1.135 djm 845: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 846: } else {
1.209 djm 847: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 848: logit("Bad forwarding specification.");
849: goto out;
850: }
1.204 stevesk 851: if (local || dynamic) {
1.135 djm 852: if (channel_setup_local_fwd_listener(fwd.listen_host,
853: fwd.listen_port, fwd.connect_host,
854: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 855: logit("Port forwarding failed.");
856: goto out;
857: }
1.135 djm 858: } else {
1.167 markus 859: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 860: fwd.listen_port, fwd.connect_host,
1.167 markus 861: fwd.connect_port) < 0) {
862: logit("Port forwarding failed.");
863: goto out;
864: }
1.135 djm 865: }
866:
1.121 djm 867: logit("Forwarding port.");
868: }
869:
1.97 jakob 870: out:
871: signal(SIGINT, handler);
1.216 djm 872: enter_raw_mode(force_tty_flag);
1.97 jakob 873: if (cmd)
874: xfree(cmd);
1.183 djm 875: if (fwd.listen_host != NULL)
876: xfree(fwd.listen_host);
877: if (fwd.connect_host != NULL)
878: xfree(fwd.connect_host);
1.97 jakob 879: }
880:
1.195 djm 881: /*
882: * Process the characters one by one, call with c==NULL for proto1 case.
883: */
1.77 itojun 884: static int
1.195 djm 885: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
886: char *buf, int len)
1.31 markus 887: {
1.32 markus 888: char string[1024];
1.31 markus 889: pid_t pid;
890: int bytes = 0;
1.42 markus 891: u_int i;
892: u_char ch;
1.31 markus 893: char *s;
1.195 djm 894: int *escape_pendingp, escape_char;
895: struct escape_filter_ctx *efc;
1.31 markus 896:
1.195 djm 897: if (c == NULL) {
898: escape_pendingp = &escape_pending1;
899: escape_char = escape_char1;
900: } else {
901: if (c->filter_ctx == NULL)
902: return 0;
903: efc = (struct escape_filter_ctx *)c->filter_ctx;
904: escape_pendingp = &efc->escape_pending;
905: escape_char = efc->escape_char;
906: }
907:
1.139 djm 908: if (len <= 0)
909: return (0);
910:
911: for (i = 0; i < (u_int)len; i++) {
1.31 markus 912: /* Get one character at a time. */
913: ch = buf[i];
914:
1.195 djm 915: if (*escape_pendingp) {
1.31 markus 916: /* We have previously seen an escape character. */
917: /* Clear the flag now. */
1.195 djm 918: *escape_pendingp = 0;
1.31 markus 919:
920: /* Process the escaped character. */
921: switch (ch) {
922: case '.':
923: /* Terminate the connection. */
1.195 djm 924: snprintf(string, sizeof string, "%c.\r\n",
925: escape_char);
1.32 markus 926: buffer_append(berr, string, strlen(string));
1.31 markus 927:
1.217 djm 928: if (c && c->ctl_chan != -1) {
1.195 djm 929: chan_read_failed(c);
930: chan_write_failed(c);
931: return 0;
932: } else
933: quit_pending = 1;
1.31 markus 934: return -1;
935:
936: case 'Z' - 64:
1.195 djm 937: /* XXX support this for mux clients */
1.217 djm 938: if (c && c->ctl_chan != -1) {
1.195 djm 939: noescape:
940: snprintf(string, sizeof string,
941: "%c%c escape not available to "
942: "multiplexed sessions\r\n",
943: escape_char, ch);
944: buffer_append(berr, string,
945: strlen(string));
946: continue;
947: }
1.197 djm 948: /* Suspend the program. Inform the user */
1.195 djm 949: snprintf(string, sizeof string,
950: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 951: buffer_append(berr, string, strlen(string));
1.31 markus 952:
953: /* Restore terminal modes and suspend. */
954: client_suspend_self(bin, bout, berr);
955:
956: /* We have been continued. */
957: continue;
958:
1.111 markus 959: case 'B':
960: if (compat20) {
961: snprintf(string, sizeof string,
962: "%cB\r\n", escape_char);
963: buffer_append(berr, string,
964: strlen(string));
965: channel_request_start(session_ident,
966: "break", 0);
967: packet_put_int(1000);
968: packet_send();
969: }
970: continue;
971:
1.54 markus 972: case 'R':
1.59 markus 973: if (compat20) {
974: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 975: logit("Server does not "
976: "support re-keying");
1.59 markus 977: else
978: need_rekeying = 1;
979: }
1.54 markus 980: continue;
981:
1.31 markus 982: case '&':
1.217 djm 983: if (c && c->ctl_chan != -1)
1.195 djm 984: goto noescape;
1.31 markus 985: /*
1.197 djm 986: * Detach the program (continue to serve
987: * connections, but put in background and no
988: * more new connections).
1.31 markus 989: */
990: /* Restore tty modes. */
1.216 djm 991: leave_raw_mode(force_tty_flag);
1.31 markus 992:
993: /* Stop listening for new connections. */
1.86 markus 994: channel_stop_listening();
1.31 markus 995:
1.86 markus 996: snprintf(string, sizeof string,
997: "%c& [backgrounded]\n", escape_char);
998: buffer_append(berr, string, strlen(string));
1.31 markus 999:
1000: /* Fork into background. */
1001: pid = fork();
1002: if (pid < 0) {
1003: error("fork: %.100s", strerror(errno));
1004: continue;
1005: }
1006: if (pid != 0) { /* This is the parent. */
1007: /* The parent just exits. */
1008: exit(0);
1009: }
1010: /* The child continues serving connections. */
1.86 markus 1011: if (compat20) {
1012: buffer_append(bin, "\004", 1);
1013: /* fake EOF on stdin */
1014: return -1;
1015: } else if (!stdin_eof) {
1016: /*
1.197 djm 1017: * Sending SSH_CMSG_EOF alone does not
1018: * always appear to be enough. So we
1019: * try to send an EOF character first.
1.86 markus 1020: */
1021: packet_start(SSH_CMSG_STDIN_DATA);
1022: packet_put_string("\004", 1);
1023: packet_send();
1024: /* Close stdin. */
1025: stdin_eof = 1;
1026: if (buffer_len(bin) == 0) {
1027: packet_start(SSH_CMSG_EOF);
1028: packet_send();
1029: }
1030: }
1031: continue;
1.31 markus 1032:
1033: case '?':
1.217 djm 1034: if (c && c->ctl_chan != -1) {
1.195 djm 1035: snprintf(string, sizeof string,
1036: "%c?\r\n\
1037: Supported escape sequences:\r\n\
1038: %c. - terminate session\r\n\
1039: %cB - send a BREAK to the remote system\r\n\
1040: %cR - Request rekey (SSH protocol 2 only)\r\n\
1041: %c# - list forwarded connections\r\n\
1042: %c? - this message\r\n\
1043: %c%c - send the escape character by typing it twice\r\n\
1044: (Note that escapes are only recognized immediately after newline.)\r\n",
1045: escape_char, escape_char,
1046: escape_char, escape_char,
1047: escape_char, escape_char,
1.206 djm 1048: escape_char, escape_char);
1.195 djm 1049: } else {
1050: snprintf(string, sizeof string,
1.31 markus 1051: "%c?\r\n\
1052: Supported escape sequences:\r\n\
1.195 djm 1053: %c. - terminate connection (and any multiplexed sessions)\r\n\
1054: %cB - send a BREAK to the remote system\r\n\
1055: %cC - open a command line\r\n\
1056: %cR - Request rekey (SSH protocol 2 only)\r\n\
1057: %c^Z - suspend ssh\r\n\
1058: %c# - list forwarded connections\r\n\
1059: %c& - background ssh (when waiting for connections to terminate)\r\n\
1060: %c? - this message\r\n\
1061: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1062: (Note that escapes are only recognized immediately after newline.)\r\n",
1.195 djm 1063: escape_char, escape_char,
1064: escape_char, escape_char,
1065: escape_char, escape_char,
1066: escape_char, escape_char,
1067: escape_char, escape_char,
1068: escape_char);
1069: }
1.32 markus 1070: buffer_append(berr, string, strlen(string));
1.31 markus 1071: continue;
1072:
1073: case '#':
1.195 djm 1074: snprintf(string, sizeof string, "%c#\r\n",
1075: escape_char);
1.32 markus 1076: buffer_append(berr, string, strlen(string));
1.31 markus 1077: s = channel_open_message();
1078: buffer_append(berr, s, strlen(s));
1079: xfree(s);
1.97 jakob 1080: continue;
1081:
1082: case 'C':
1.217 djm 1083: if (c && c->ctl_chan != -1)
1.206 djm 1084: goto noescape;
1.99 markus 1085: process_cmdline();
1.31 markus 1086: continue;
1087:
1088: default:
1089: if (ch != escape_char) {
1090: buffer_put_char(bin, escape_char);
1091: bytes++;
1092: }
1093: /* Escaped characters fall through here */
1094: break;
1095: }
1096: } else {
1097: /*
1.197 djm 1098: * The previous character was not an escape char.
1099: * Check if this is an escape.
1.31 markus 1100: */
1101: if (last_was_cr && ch == escape_char) {
1.197 djm 1102: /*
1103: * It is. Set the flag and continue to
1104: * next character.
1105: */
1.195 djm 1106: *escape_pendingp = 1;
1.31 markus 1107: continue;
1108: }
1109: }
1110:
1111: /*
1112: * Normal character. Record whether it was a newline,
1113: * and append it to the buffer.
1114: */
1115: last_was_cr = (ch == '\r' || ch == '\n');
1116: buffer_put_char(bin, ch);
1117: bytes++;
1118: }
1119: return bytes;
1120: }
1121:
1.77 itojun 1122: static void
1.161 deraadt 1123: client_process_input(fd_set *readset)
1.17 markus 1124: {
1.21 deraadt 1125: int len;
1.31 markus 1126: char buf[8192];
1.16 markus 1127:
1.11 markus 1128: /* Read input from stdin. */
1129: if (FD_ISSET(fileno(stdin), readset)) {
1130: /* Read as much as possible. */
1131: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1132: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1133: return; /* we'll try again later */
1.11 markus 1134: if (len <= 0) {
1.13 markus 1135: /*
1136: * Received EOF or error. They are treated
1137: * similarly, except that an error message is printed
1138: * if it was an error condition.
1139: */
1.11 markus 1140: if (len < 0) {
1.197 djm 1141: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1142: strerror(errno));
1.11 markus 1143: buffer_append(&stderr_buffer, buf, strlen(buf));
1144: }
1145: /* Mark that we have seen EOF. */
1146: stdin_eof = 1;
1.13 markus 1147: /*
1148: * Send an EOF message to the server unless there is
1149: * data in the buffer. If there is data in the
1150: * buffer, no message will be sent now. Code
1151: * elsewhere will send the EOF when the buffer
1152: * becomes empty if stdin_eof is set.
1153: */
1.11 markus 1154: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1155: packet_start(SSH_CMSG_EOF);
1156: packet_send();
1.11 markus 1157: }
1.195 djm 1158: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1159: /*
1160: * Normal successful read, and no escape character.
1161: * Just append the data to buffer.
1162: */
1.11 markus 1163: buffer_append(&stdin_buffer, buf, len);
1164: } else {
1.13 markus 1165: /*
1.197 djm 1166: * Normal, successful read. But we have an escape
1167: * character and have to process the characters one
1168: * by one.
1.13 markus 1169: */
1.195 djm 1170: if (process_escapes(NULL, &stdin_buffer,
1171: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1172: return;
1.11 markus 1173: }
1174: }
1175: }
1176:
1.77 itojun 1177: static void
1.161 deraadt 1178: client_process_output(fd_set *writeset)
1.11 markus 1179: {
1180: int len;
1181: char buf[100];
1.1 deraadt 1182:
1.11 markus 1183: /* Write buffered output to stdout. */
1184: if (FD_ISSET(fileno(stdout), writeset)) {
1185: /* Write as much data as possible. */
1186: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1187: buffer_len(&stdout_buffer));
1.11 markus 1188: if (len <= 0) {
1.64 markus 1189: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1190: len = 0;
1191: else {
1.13 markus 1192: /*
1193: * An error or EOF was encountered. Put an
1194: * error message to stderr buffer.
1195: */
1.197 djm 1196: snprintf(buf, sizeof buf,
1197: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1198: buffer_append(&stderr_buffer, buf, strlen(buf));
1199: quit_pending = 1;
1200: return;
1201: }
1202: }
1203: /* Consume printed data from the buffer. */
1204: buffer_consume(&stdout_buffer, len);
1205: }
1206: /* Write buffered output to stderr. */
1207: if (FD_ISSET(fileno(stderr), writeset)) {
1208: /* Write as much data as possible. */
1209: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1210: buffer_len(&stderr_buffer));
1.11 markus 1211: if (len <= 0) {
1.64 markus 1212: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1213: len = 0;
1214: else {
1.197 djm 1215: /*
1216: * EOF or error, but can't even print
1217: * error message.
1218: */
1.11 markus 1219: quit_pending = 1;
1220: return;
1221: }
1222: }
1223: /* Consume printed characters from the buffer. */
1224: buffer_consume(&stderr_buffer, len);
1225: }
1.1 deraadt 1226: }
1227:
1.13 markus 1228: /*
1.15 markus 1229: * Get packets from the connection input buffer, and process them as long as
1230: * there are packets available.
1231: *
1232: * Any unknown packets received during the actual
1233: * session cause the session to terminate. This is
1234: * intended to make debugging easier since no
1235: * confirmations are sent. Any compatible protocol
1236: * extensions must be negotiated during the
1237: * preparatory phase.
1238: */
1239:
1.77 itojun 1240: static void
1.49 itojun 1241: client_process_buffered_input_packets(void)
1.15 markus 1242: {
1.197 djm 1243: dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1244: compat20 ? xxx_kex : NULL);
1.15 markus 1245: }
1246:
1.31 markus 1247: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1248:
1.195 djm 1249: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1250: void *
1251: client_new_escape_filter_ctx(int escape_char)
1252: {
1253: struct escape_filter_ctx *ret;
1254:
1255: ret = xmalloc(sizeof(*ret));
1256: ret->escape_pending = 0;
1257: ret->escape_char = escape_char;
1258: return (void *)ret;
1259: }
1260:
1.198 djm 1261: /* Free the escape filter context on channel free */
1262: void
1263: client_filter_cleanup(int cid, void *ctx)
1264: {
1265: xfree(ctx);
1266: }
1267:
1.195 djm 1268: int
1269: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1270: {
1.190 djm 1271: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1272: return 0;
1273:
1.195 djm 1274: return process_escapes(c, &c->input, &c->output, &c->extended,
1275: buf, len);
1.30 markus 1276: }
1277:
1.77 itojun 1278: static void
1.60 markus 1279: client_channel_closed(int id, void *arg)
1280: {
1.83 markus 1281: channel_cancel_cleanup(id);
1.60 markus 1282: session_closed = 1;
1.216 djm 1283: leave_raw_mode(force_tty_flag);
1.60 markus 1284: }
1285:
1.15 markus 1286: /*
1.13 markus 1287: * Implements the interactive session with the server. This is called after
1288: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1289: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1290: * used as an escape character for terminating or suspending the session.
1.13 markus 1291: */
1.1 deraadt 1292:
1.20 markus 1293: int
1.30 markus 1294: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1295: {
1.46 markus 1296: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1297: double start_time, total_time;
1.130 avsm 1298: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1.200 markus 1299: u_int64_t ibytes, obytes;
1.130 avsm 1300: u_int nalloc = 0;
1.11 markus 1301: char buf[100];
1302:
1303: debug("Entering interactive session.");
1304:
1305: start_time = get_current_time();
1306:
1307: /* Initialize variables. */
1.195 djm 1308: escape_pending1 = 0;
1.11 markus 1309: last_was_cr = 1;
1310: exit_status = -1;
1311: stdin_eof = 0;
1312: buffer_high = 64 * 1024;
1313: connection_in = packet_get_connection_in();
1314: connection_out = packet_get_connection_out();
1.46 markus 1315: max_fd = MAX(connection_in, connection_out);
1316:
1317: if (!compat20) {
1.63 markus 1318: /* enable nonblocking unless tty */
1319: if (!isatty(fileno(stdin)))
1320: set_nonblock(fileno(stdin));
1321: if (!isatty(fileno(stdout)))
1322: set_nonblock(fileno(stdout));
1323: if (!isatty(fileno(stderr)))
1324: set_nonblock(fileno(stderr));
1.46 markus 1325: max_fd = MAX(max_fd, fileno(stdin));
1326: max_fd = MAX(max_fd, fileno(stdout));
1327: max_fd = MAX(max_fd, fileno(stderr));
1328: }
1.11 markus 1329: quit_pending = 0;
1.195 djm 1330: escape_char1 = escape_char_arg;
1.11 markus 1331:
1332: /* Initialize buffers. */
1333: buffer_init(&stdin_buffer);
1334: buffer_init(&stdout_buffer);
1335: buffer_init(&stderr_buffer);
1336:
1.15 markus 1337: client_init_dispatch();
1338:
1.105 markus 1339: /*
1340: * Set signal handlers, (e.g. to restore non-blocking mode)
1341: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1342: */
1.131 djm 1343: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1344: signal(SIGHUP, signal_handler);
1.105 markus 1345: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1346: signal(SIGINT, signal_handler);
1347: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1348: signal(SIGQUIT, signal_handler);
1349: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1350: signal(SIGTERM, signal_handler);
1.132 djm 1351: signal(SIGWINCH, window_change_handler);
1.11 markus 1352:
1353: if (have_pty)
1.216 djm 1354: enter_raw_mode(force_tty_flag);
1.11 markus 1355:
1.48 markus 1356: if (compat20) {
1357: session_ident = ssh2_chan_id;
1.195 djm 1358: if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1.48 markus 1359: channel_register_filter(session_ident,
1.195 djm 1360: client_simple_escape_filter, NULL,
1.198 djm 1361: client_filter_cleanup,
1.195 djm 1362: client_new_escape_filter_ctx(escape_char_arg));
1.60 markus 1363: if (session_ident != -1)
1364: channel_register_cleanup(session_ident,
1.143 djm 1365: client_channel_closed, 0);
1.48 markus 1366: } else {
1367: /* Check if we should immediately send eof on stdin. */
1.16 markus 1368: client_check_initial_eof_on_stdin();
1.48 markus 1369: }
1.30 markus 1370:
1.11 markus 1371: /* Main loop of the client for the interactive session mode. */
1372: while (!quit_pending) {
1373:
1.13 markus 1374: /* Process buffered packets sent by the server. */
1.11 markus 1375: client_process_buffered_input_packets();
1376:
1.60 markus 1377: if (compat20 && session_closed && !channel_still_open())
1378: break;
1379:
1.56 markus 1380: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1381:
1.56 markus 1382: if (rekeying) {
1383: debug("rekeying in progress");
1384: } else {
1385: /*
1386: * Make packets of buffered stdin data, and buffer
1387: * them for sending to the server.
1388: */
1389: if (!compat20)
1390: client_make_packets_from_stdin_data();
1.11 markus 1391:
1.56 markus 1392: /*
1393: * Make packets from buffered channel data, and
1394: * enqueue them for sending to the server.
1395: */
1396: if (packet_not_very_much_data_to_write())
1397: channel_output_poll();
1.11 markus 1398:
1.56 markus 1399: /*
1400: * Check if the window size has changed, and buffer a
1401: * message about it to the server if so.
1402: */
1403: client_check_window_change();
1.11 markus 1404:
1.56 markus 1405: if (quit_pending)
1406: break;
1407: }
1.13 markus 1408: /*
1409: * Wait until we have something to do (something becomes
1410: * available on one of the descriptors).
1411: */
1.81 markus 1412: max_fd2 = max_fd;
1.56 markus 1413: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1414: &max_fd2, &nalloc, rekeying);
1.11 markus 1415:
1416: if (quit_pending)
1417: break;
1418:
1.56 markus 1419: /* Do channel operations unless rekeying in progress. */
1420: if (!rekeying) {
1421: channel_after_select(readset, writeset);
1.108 markus 1422: if (need_rekeying || packet_need_rekeying()) {
1423: debug("need rekeying");
1.56 markus 1424: xxx_kex->done = 0;
1425: kex_send_kexinit(xxx_kex);
1426: need_rekeying = 0;
1427: }
1428: }
1.11 markus 1429:
1.17 markus 1430: /* Buffer input from the connection. */
1.46 markus 1431: client_process_net_input(readset);
1.17 markus 1432:
1433: if (quit_pending)
1434: break;
1.11 markus 1435:
1.17 markus 1436: if (!compat20) {
1437: /* Buffer data from stdin */
1.46 markus 1438: client_process_input(readset);
1.17 markus 1439: /*
1440: * Process output to stdout and stderr. Output to
1441: * the connection is processed elsewhere (above).
1442: */
1.46 markus 1443: client_process_output(writeset);
1.214 andreas 1444: }
1445:
1446: if (session_resumed) {
1447: connection_in = packet_get_connection_in();
1448: connection_out = packet_get_connection_out();
1449: max_fd = MAX(max_fd, connection_out);
1450: max_fd = MAX(max_fd, connection_in);
1451: session_resumed = 0;
1.17 markus 1452: }
1.11 markus 1453:
1.197 djm 1454: /*
1455: * Send as much buffered packet data as possible to the
1456: * sender.
1457: */
1.46 markus 1458: if (FD_ISSET(connection_out, writeset))
1.11 markus 1459: packet_write_poll();
1460: }
1.46 markus 1461: if (readset)
1462: xfree(readset);
1463: if (writeset)
1464: xfree(writeset);
1.11 markus 1465:
1466: /* Terminate the session. */
1467:
1468: /* Stop watching for window change. */
1.132 djm 1469: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1470:
1.213 stevesk 1471: if (compat20) {
1472: packet_start(SSH2_MSG_DISCONNECT);
1473: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1474: packet_put_cstring("disconnected by user");
1.219 ! djm 1475: packet_put_cstring(""); /* language tag */
1.213 stevesk 1476: packet_send();
1477: packet_write_wait();
1478: }
1.11 markus 1479:
1.76 markus 1480: channel_free_all();
1.11 markus 1481:
1.75 markus 1482: if (have_pty)
1.216 djm 1483: leave_raw_mode(force_tty_flag);
1.75 markus 1484:
1485: /* restore blocking io */
1486: if (!isatty(fileno(stdin)))
1487: unset_nonblock(fileno(stdin));
1488: if (!isatty(fileno(stdout)))
1489: unset_nonblock(fileno(stdout));
1490: if (!isatty(fileno(stderr)))
1491: unset_nonblock(fileno(stderr));
1.116 dtucker 1492:
1493: /*
1494: * If there was no shell or command requested, there will be no remote
1495: * exit status to be returned. In that case, clear error code if the
1496: * connection was deliberately terminated at this end.
1497: */
1498: if (no_shell_flag && received_signal == SIGTERM) {
1499: received_signal = 0;
1500: exit_status = 0;
1501: }
1.75 markus 1502:
1.113 markus 1503: if (received_signal)
1.89 itojun 1504: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1505:
1.13 markus 1506: /*
1507: * In interactive mode (with pseudo tty) display a message indicating
1508: * that the connection has been closed.
1509: */
1.11 markus 1510: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1511: snprintf(buf, sizeof buf,
1512: "Connection to %.64s closed.\r\n", host);
1.11 markus 1513: buffer_append(&stderr_buffer, buf, strlen(buf));
1514: }
1.70 markus 1515:
1.11 markus 1516: /* Output any buffered data for stdout. */
1.70 markus 1517: while (buffer_len(&stdout_buffer) > 0) {
1518: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1519: buffer_len(&stdout_buffer));
1.70 markus 1520: if (len <= 0) {
1.11 markus 1521: error("Write failed flushing stdout buffer.");
1.70 markus 1522: break;
1523: }
1.11 markus 1524: buffer_consume(&stdout_buffer, len);
1525: }
1526:
1527: /* Output any buffered data for stderr. */
1.70 markus 1528: while (buffer_len(&stderr_buffer) > 0) {
1529: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1530: buffer_len(&stderr_buffer));
1.70 markus 1531: if (len <= 0) {
1.11 markus 1532: error("Write failed flushing stderr buffer.");
1.70 markus 1533: break;
1534: }
1.11 markus 1535: buffer_consume(&stderr_buffer, len);
1536: }
1537:
1538: /* Clear and free any buffers. */
1539: memset(buf, 0, sizeof(buf));
1540: buffer_free(&stdin_buffer);
1541: buffer_free(&stdout_buffer);
1542: buffer_free(&stderr_buffer);
1543:
1544: /* Report bytes transferred, and transfer rates. */
1545: total_time = get_current_time() - start_time;
1.200 markus 1546: packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1547: packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1548: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1549: obytes, ibytes, total_time);
1.11 markus 1550: if (total_time > 0)
1.200 markus 1551: verbose("Bytes per second: sent %.1f, received %.1f",
1552: obytes / total_time, ibytes / total_time);
1.11 markus 1553: /* Return the exit status of the program. */
1554: debug("Exit status %d", exit_status);
1555: return exit_status;
1.15 markus 1556: }
1557:
1558: /*********/
1559:
1.77 itojun 1560: static void
1.94 markus 1561: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1562: {
1.42 markus 1563: u_int data_len;
1.15 markus 1564: char *data = packet_get_string(&data_len);
1.93 markus 1565: packet_check_eom();
1.15 markus 1566: buffer_append(&stdout_buffer, data, data_len);
1567: memset(data, 0, data_len);
1568: xfree(data);
1569: }
1.77 itojun 1570: static void
1.94 markus 1571: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1572: {
1.42 markus 1573: u_int data_len;
1.15 markus 1574: char *data = packet_get_string(&data_len);
1.93 markus 1575: packet_check_eom();
1.15 markus 1576: buffer_append(&stderr_buffer, data, data_len);
1577: memset(data, 0, data_len);
1578: xfree(data);
1579: }
1.77 itojun 1580: static void
1.94 markus 1581: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1582: {
1583: exit_status = packet_get_int();
1.93 markus 1584: packet_check_eom();
1.15 markus 1585: /* Acknowledge the exit. */
1586: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1587: packet_send();
1588: /*
1589: * Must wait for packet to be sent since we are
1590: * exiting the loop.
1591: */
1592: packet_write_wait();
1593: /* Flag that we want to exit. */
1594: quit_pending = 1;
1595: }
1.115 markus 1596: static void
1597: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1598: {
1599: Channel *c = NULL;
1600: int remote_id, sock;
1601:
1602: /* Read the remote channel number from the message. */
1603: remote_id = packet_get_int();
1604: packet_check_eom();
1605:
1606: /*
1607: * Get a connection to the local authentication agent (this may again
1608: * get forwarded).
1609: */
1610: sock = ssh_get_authentication_socket();
1611:
1612: /*
1613: * If we could not connect the agent, send an error message back to
1614: * the server. This should never happen unless the agent dies,
1615: * because authentication forwarding is only enabled if we have an
1616: * agent.
1617: */
1618: if (sock >= 0) {
1619: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1620: -1, 0, 0, 0, "authentication agent connection", 1);
1621: c->remote_id = remote_id;
1622: c->force_drain = 1;
1623: }
1624: if (c == NULL) {
1625: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1626: packet_put_int(remote_id);
1627: } else {
1628: /* Send a confirmation to the remote host. */
1629: debug("Forwarding authentication connection.");
1630: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1631: packet_put_int(remote_id);
1632: packet_put_int(c->self);
1633: }
1634: packet_send();
1635: }
1.15 markus 1636:
1.77 itojun 1637: static Channel *
1.40 markus 1638: client_request_forwarded_tcpip(const char *request_type, int rchan)
1639: {
1.103 deraadt 1640: Channel *c = NULL;
1.40 markus 1641: char *listen_address, *originator_address;
1.208 djm 1642: u_short listen_port, originator_port;
1.40 markus 1643:
1644: /* Get rest of the packet */
1645: listen_address = packet_get_string(NULL);
1646: listen_port = packet_get_int();
1647: originator_address = packet_get_string(NULL);
1648: originator_port = packet_get_int();
1.93 markus 1649: packet_check_eom();
1.40 markus 1650:
1.191 djm 1651: debug("client_request_forwarded_tcpip: listen %s port %d, "
1652: "originator %s port %d", listen_address, listen_port,
1653: originator_address, originator_port);
1654:
1655: c = channel_connect_by_listen_address(listen_port,
1656: "forwarded-tcpip", originator_address);
1.40 markus 1657:
1658: xfree(originator_address);
1659: xfree(listen_address);
1660: return c;
1661: }
1662:
1.103 deraadt 1663: static Channel *
1.40 markus 1664: client_request_x11(const char *request_type, int rchan)
1665: {
1666: Channel *c = NULL;
1667: char *originator;
1.208 djm 1668: u_short originator_port;
1.67 markus 1669: int sock;
1.40 markus 1670:
1671: if (!options.forward_x11) {
1672: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1673: error("Warning: this is probably a break-in attempt by a "
1674: "malicious server.");
1.40 markus 1675: return NULL;
1676: }
1677: originator = packet_get_string(NULL);
1678: if (datafellows & SSH_BUG_X11FWD) {
1679: debug2("buggy server: x11 request w/o originator_port");
1680: originator_port = 0;
1681: } else {
1682: originator_port = packet_get_int();
1683: }
1.93 markus 1684: packet_check_eom();
1.40 markus 1685: /* XXX check permission */
1.47 markus 1686: debug("client_request_x11: request from %s %d", originator,
1687: originator_port);
1.67 markus 1688: xfree(originator);
1.40 markus 1689: sock = x11_connect_display();
1.67 markus 1690: if (sock < 0)
1691: return NULL;
1692: c = channel_new("x11",
1693: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1694: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1695: c->force_drain = 1;
1.40 markus 1696: return c;
1697: }
1698:
1.103 deraadt 1699: static Channel *
1.40 markus 1700: client_request_agent(const char *request_type, int rchan)
1701: {
1702: Channel *c = NULL;
1.67 markus 1703: int sock;
1.40 markus 1704:
1705: if (!options.forward_agent) {
1706: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1707: error("Warning: this is probably a break-in attempt by a "
1708: "malicious server.");
1.40 markus 1709: return NULL;
1710: }
1.177 stevesk 1711: sock = ssh_get_authentication_socket();
1.67 markus 1712: if (sock < 0)
1713: return NULL;
1714: c = channel_new("authentication agent connection",
1715: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1716: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1717: "authentication agent connection", 1);
1.82 markus 1718: c->force_drain = 1;
1.40 markus 1719: return c;
1.180 djm 1720: }
1721:
1722: int
1723: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1724: {
1725: Channel *c;
1726: int fd;
1727:
1728: if (tun_mode == SSH_TUNMODE_NO)
1729: return 0;
1730:
1731: if (!compat20) {
1.207 stevesk 1732: error("Tunnel forwarding is not supported for protocol 1");
1.180 djm 1733: return -1;
1734: }
1735:
1736: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1737:
1738: /* Open local tunnel device */
1739: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1740: error("Tunnel device open failed.");
1741: return -1;
1742: }
1743:
1744: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1745: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1746: c->datagram = 1;
1747:
1748: packet_start(SSH2_MSG_CHANNEL_OPEN);
1749: packet_put_cstring("tun@openssh.com");
1750: packet_put_int(c->self);
1751: packet_put_int(c->local_window_max);
1752: packet_put_int(c->local_maxpacket);
1753: packet_put_int(tun_mode);
1754: packet_put_int(remote_tun);
1755: packet_send();
1756:
1757: return 0;
1.40 markus 1758: }
1759:
1.22 markus 1760: /* XXXX move to generic input handler */
1.77 itojun 1761: static void
1.94 markus 1762: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1763: {
1764: Channel *c = NULL;
1765: char *ctype;
1766: int rchan;
1.102 markus 1767: u_int rmaxpack, rwindow, len;
1.22 markus 1768:
1769: ctype = packet_get_string(&len);
1770: rchan = packet_get_int();
1771: rwindow = packet_get_int();
1772: rmaxpack = packet_get_int();
1773:
1.24 markus 1774: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1775: ctype, rchan, rwindow, rmaxpack);
1776:
1.40 markus 1777: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1778: c = client_request_forwarded_tcpip(ctype, rchan);
1779: } else if (strcmp(ctype, "x11") == 0) {
1780: c = client_request_x11(ctype, rchan);
1781: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1782: c = client_request_agent(ctype, rchan);
1.22 markus 1783: }
1784: /* XXX duplicate : */
1785: if (c != NULL) {
1786: debug("confirm %s", ctype);
1787: c->remote_id = rchan;
1788: c->remote_window = rwindow;
1789: c->remote_maxpacket = rmaxpack;
1.69 markus 1790: if (c->type != SSH_CHANNEL_CONNECTING) {
1791: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1792: packet_put_int(c->remote_id);
1793: packet_put_int(c->self);
1794: packet_put_int(c->local_window);
1795: packet_put_int(c->local_maxpacket);
1796: packet_send();
1797: }
1.22 markus 1798: } else {
1799: debug("failure %s", ctype);
1800: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1801: packet_put_int(rchan);
1802: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1803: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1804: packet_put_cstring("open failed");
1.66 markus 1805: packet_put_cstring("");
1806: }
1.22 markus 1807: packet_send();
1808: }
1809: xfree(ctype);
1810: }
1.77 itojun 1811: static void
1.94 markus 1812: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1813: {
1814: Channel *c = NULL;
1.123 djm 1815: int exitval, id, reply, success = 0;
1.48 markus 1816: char *rtype;
1817:
1818: id = packet_get_int();
1819: rtype = packet_get_string(NULL);
1820: reply = packet_get_char();
1821:
1822: debug("client_input_channel_req: channel %d rtype %s reply %d",
1823: id, rtype, reply);
1824:
1.128 djm 1825: if (id == -1) {
1826: error("client_input_channel_req: request for channel -1");
1827: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 1828: error("client_input_channel_req: channel %d: "
1829: "unknown channel", id);
1.193 markus 1830: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1831: packet_check_eom();
1832: chan_rcvd_eow(c);
1.48 markus 1833: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1834: exitval = packet_get_int();
1.217 djm 1835: if (c->ctl_chan != -1) {
1836: mux_exit_message(c, exitval);
1.215 djm 1837: success = 1;
1838: } else if (id == session_ident) {
1839: /* Record exit value of local session */
1.123 djm 1840: success = 1;
1841: exit_status = exitval;
1.215 djm 1842: } else {
1.218 djm 1843: /* Probably for a mux channel that has already closed */
1844: debug("%s: no sink for exit-status on channel %d",
1845: __func__, id);
1.123 djm 1846: }
1.93 markus 1847: packet_check_eom();
1.48 markus 1848: }
1849: if (reply) {
1850: packet_start(success ?
1851: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 1852: packet_put_int(c->remote_id);
1.48 markus 1853: packet_send();
1854: }
1855: xfree(rtype);
1856: }
1.95 markus 1857: static void
1858: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1859: {
1860: char *rtype;
1861: int want_reply;
1862: int success = 0;
1863:
1864: rtype = packet_get_string(NULL);
1865: want_reply = packet_get_char();
1.117 markus 1866: debug("client_input_global_request: rtype %s want_reply %d",
1867: rtype, want_reply);
1.95 markus 1868: if (want_reply) {
1869: packet_start(success ?
1870: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1871: packet_send();
1872: packet_write_wait();
1873: }
1874: xfree(rtype);
1875: }
1.22 markus 1876:
1.123 djm 1877: void
1.129 deraadt 1878: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 1879: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 1880: {
1881: int len;
1.132 djm 1882: Channel *c = NULL;
1.123 djm 1883:
1884: debug2("%s: id %d", __func__, id);
1885:
1.132 djm 1886: if ((c = channel_lookup(id)) == NULL)
1887: fatal("client_session2_setup: channel %d: unknown channel", id);
1888:
1.123 djm 1889: if (want_tty) {
1890: struct winsize ws;
1891:
1892: /* Store window size in the packet. */
1893: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1894: memset(&ws, 0, sizeof(ws));
1895:
1.190 djm 1896: channel_request_start(id, "pty-req", 1);
1897: client_expect_confirm(id, "PTY allocation", 0);
1.123 djm 1898: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1899: packet_put_int((u_int)ws.ws_col);
1900: packet_put_int((u_int)ws.ws_row);
1901: packet_put_int((u_int)ws.ws_xpixel);
1902: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 1903: if (tiop == NULL)
1904: tiop = get_saved_tio();
1905: tty_make_modes(-1, tiop);
1.123 djm 1906: packet_send();
1907: /* XXX wait for reply */
1.132 djm 1908: c->client_tty = 1;
1.123 djm 1909: }
1910:
1911: /* Transfer any environment variables from client to server */
1.126 djm 1912: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1913: int i, j, matched;
1914: char *name, *val;
1915:
1916: debug("Sending environment.");
1.126 djm 1917: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1918: /* Split */
1.126 djm 1919: name = xstrdup(env[i]);
1.123 djm 1920: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1921: xfree(name);
1.123 djm 1922: continue;
1923: }
1924: *val++ = '\0';
1925:
1926: matched = 0;
1927: for (j = 0; j < options.num_send_env; j++) {
1928: if (match_pattern(name, options.send_env[j])) {
1929: matched = 1;
1930: break;
1931: }
1932: }
1933: if (!matched) {
1934: debug3("Ignored env %s", name);
1.144 stevesk 1935: xfree(name);
1.123 djm 1936: continue;
1937: }
1938:
1939: debug("Sending env %s = %s", name, val);
1940: channel_request_start(id, "env", 0);
1941: packet_put_cstring(name);
1942: packet_put_cstring(val);
1943: packet_send();
1.144 stevesk 1944: xfree(name);
1.123 djm 1945: }
1946: }
1947:
1948: len = buffer_len(cmd);
1949: if (len > 0) {
1950: if (len > 900)
1951: len = 900;
1952: if (want_subsystem) {
1.190 djm 1953: debug("Sending subsystem: %.*s",
1954: len, (u_char*)buffer_ptr(cmd));
1955: channel_request_start(id, "subsystem", 1);
1956: client_expect_confirm(id, "subsystem", 1);
1.123 djm 1957: } else {
1.190 djm 1958: debug("Sending command: %.*s",
1959: len, (u_char*)buffer_ptr(cmd));
1960: channel_request_start(id, "exec", 1);
1961: client_expect_confirm(id, "exec", 1);
1.123 djm 1962: }
1963: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1964: packet_send();
1965: } else {
1.190 djm 1966: channel_request_start(id, "shell", 1);
1967: client_expect_confirm(id, "shell", 1);
1.123 djm 1968: packet_send();
1969: }
1970: }
1971:
1.77 itojun 1972: static void
1.49 itojun 1973: client_init_dispatch_20(void)
1.16 markus 1974: {
1.55 markus 1975: dispatch_init(&dispatch_protocol_error);
1.100 markus 1976:
1.16 markus 1977: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1978: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1979: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1980: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1981: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1982: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1983: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1984: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1985: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 1986: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
1987: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 1988: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1989:
1990: /* rekeying */
1991: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1992:
1993: /* global request reply messages */
1994: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1995: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1996: }
1.197 djm 1997:
1.77 itojun 1998: static void
1.49 itojun 1999: client_init_dispatch_13(void)
1.15 markus 2000: {
2001: dispatch_init(NULL);
2002: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2003: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2004: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2005: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2006: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2007: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2008: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2009: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2010: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2011:
2012: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2013: &client_input_agent_open : &deny_input_open);
1.39 markus 2014: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2015: &x11_input_open : &deny_input_open);
1.15 markus 2016: }
1.197 djm 2017:
1.77 itojun 2018: static void
1.49 itojun 2019: client_init_dispatch_15(void)
1.15 markus 2020: {
2021: client_init_dispatch_13();
2022: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2023: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2024: }
1.197 djm 2025:
1.79 stevesk 2026: static void
1.49 itojun 2027: client_init_dispatch(void)
1.15 markus 2028: {
1.16 markus 2029: if (compat20)
2030: client_init_dispatch_20();
2031: else if (compat13)
1.15 markus 2032: client_init_dispatch_13();
2033: else
2034: client_init_dispatch_15();
1.113 markus 2035: }
2036:
2037: /* client specific fatal cleanup */
2038: void
1.114 markus 2039: cleanup_exit(int i)
1.113 markus 2040: {
1.216 djm 2041: leave_raw_mode(force_tty_flag);
1.113 markus 2042: leave_non_blocking();
1.192 djm 2043: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2044: unlink(options.control_path);
1.114 markus 2045: _exit(i);
1.1 deraadt 2046: }
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