Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.221
1.221 ! djm 1: /* $OpenBSD: clientloop.c,v 1.220 2010/04/10 02:08:44 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. */
1.221 ! djm 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. */
1.221 ! djm 154: static int session_closed; /* In SSH2: login session closed. */
! 155: static int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.1 deraadt 156:
1.77 itojun 157: static void client_init_dispatch(void);
1.16 markus 158: int session_ident = -1;
159:
1.214 andreas 160: int session_resumed = 0;
161:
1.195 djm 162: /* Track escape per proto2 channel */
163: struct escape_filter_ctx {
164: int escape_pending;
165: int escape_char;
166: };
167:
168: /* Context for channel confirmation replies */
1.190 djm 169: struct channel_reply_ctx {
170: const char *request_type;
171: int id, do_close;
172: };
173:
1.196 djm 174: /* Global request success/failure callbacks */
175: struct global_confirm {
176: TAILQ_ENTRY(global_confirm) entry;
177: global_confirm_cb *cb;
178: void *ctx;
179: int ref_count;
180: };
181: TAILQ_HEAD(global_confirms, global_confirm);
182: static struct global_confirms global_confirms =
183: TAILQ_HEAD_INITIALIZER(global_confirms);
184:
1.54 markus 185: /*XXX*/
186: extern Kex *xxx_kex;
187:
1.123 djm 188: void ssh_process_session2_setup(int, int, int, Buffer *);
189:
1.1 deraadt 190: /* Restores stdin to blocking mode. */
191:
1.77 itojun 192: static void
1.49 itojun 193: leave_non_blocking(void)
1.1 deraadt 194: {
1.11 markus 195: if (in_non_blocking_mode) {
1.125 djm 196: unset_nonblock(fileno(stdin));
1.11 markus 197: in_non_blocking_mode = 0;
198: }
1.1 deraadt 199: }
200:
1.11 markus 201: /* Puts stdin terminal in non-blocking mode. */
202:
1.77 itojun 203: static void
1.49 itojun 204: enter_non_blocking(void)
1.1 deraadt 205: {
1.11 markus 206: in_non_blocking_mode = 1;
1.124 djm 207: set_nonblock(fileno(stdin));
1.1 deraadt 208: }
209:
1.13 markus 210: /*
211: * Signal handler for the window change signal (SIGWINCH). This just sets a
212: * flag indicating that the window has changed.
213: */
1.157 deraadt 214: /*ARGSUSED */
1.77 itojun 215: static void
1.11 markus 216: window_change_handler(int sig)
1.1 deraadt 217: {
1.11 markus 218: received_window_change_signal = 1;
219: signal(SIGWINCH, window_change_handler);
1.1 deraadt 220: }
221:
1.13 markus 222: /*
223: * Signal handler for signals that cause the program to terminate. These
224: * signals must be trapped to restore terminal modes.
225: */
1.157 deraadt 226: /*ARGSUSED */
1.77 itojun 227: static void
1.11 markus 228: signal_handler(int sig)
1.1 deraadt 229: {
1.75 markus 230: received_signal = sig;
231: quit_pending = 1;
1.1 deraadt 232: }
233:
1.13 markus 234: /*
235: * Returns current time in seconds from Jan 1, 1970 with the maximum
236: * available resolution.
237: */
1.1 deraadt 238:
1.77 itojun 239: static double
1.49 itojun 240: get_current_time(void)
1.1 deraadt 241: {
1.11 markus 242: struct timeval tv;
243: gettimeofday(&tv, NULL);
244: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 245: }
246:
247: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
248: void
249: client_x11_get_proto(const char *display, const char *xauth_path,
1.221 ! djm 250: u_int trusted, u_int timeout, char **_proto, char **_data)
1.138 djm 251: {
252: char cmd[1024];
253: char line[512];
254: char xdisplay[512];
255: static char proto[512], data[512];
256: FILE *f;
257: int got_data = 0, generated = 0, do_unlink = 0, i;
258: char *xauthdir, *xauthfile;
259: struct stat st;
1.221 ! djm 260: u_int now;
1.138 djm 261:
262: xauthdir = xauthfile = NULL;
263: *_proto = proto;
264: *_data = data;
265: proto[0] = data[0] = '\0';
266:
267: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
268: debug("No xauth program.");
269: } else {
270: if (display == NULL) {
271: debug("x11_get_proto: DISPLAY not set");
272: return;
273: }
274: /*
275: * Handle FamilyLocal case where $DISPLAY does
276: * not match an authorization entry. For this we
277: * just try "xauth list unix:displaynum.screennum".
278: * XXX: "localhost" match to determine FamilyLocal
279: * is not perfect.
280: */
281: if (strncmp(display, "localhost:", 10) == 0) {
282: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
283: display + 10);
284: display = xdisplay;
285: }
286: if (trusted == 0) {
287: xauthdir = xmalloc(MAXPATHLEN);
288: xauthfile = xmalloc(MAXPATHLEN);
289: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
290: if (mkdtemp(xauthdir) != NULL) {
291: do_unlink = 1;
292: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
293: xauthdir);
294: snprintf(cmd, sizeof(cmd),
295: "%s -f %s generate %s " SSH_X11_PROTO
1.221 ! djm 296: " untrusted timeout %u 2>" _PATH_DEVNULL,
! 297: xauth_path, xauthfile, display, timeout);
1.138 djm 298: debug2("x11_get_proto: %s", cmd);
299: if (system(cmd) == 0)
300: generated = 1;
1.221 ! djm 301: if (x11_refuse_time == 0) {
! 302: now = time(NULL) + 1;
! 303: if (UINT_MAX - timeout < now)
! 304: x11_refuse_time = UINT_MAX;
! 305: else
! 306: x11_refuse_time = now + timeout;
! 307: }
1.138 djm 308: }
309: }
1.181 markus 310:
311: /*
312: * When in untrusted mode, we read the cookie only if it was
313: * successfully generated as an untrusted one in the step
314: * above.
315: */
316: if (trusted || generated) {
317: snprintf(cmd, sizeof(cmd),
318: "%s %s%s list %s 2>" _PATH_DEVNULL,
319: xauth_path,
320: generated ? "-f " : "" ,
321: generated ? xauthfile : "",
322: display);
323: debug2("x11_get_proto: %s", cmd);
324: f = popen(cmd, "r");
325: if (f && fgets(line, sizeof(line), f) &&
326: sscanf(line, "%*s %511s %511s", proto, data) == 2)
327: got_data = 1;
328: if (f)
329: pclose(f);
330: } else
331: error("Warning: untrusted X11 forwarding setup failed: "
332: "xauth key data not generated");
1.138 djm 333: }
334:
335: if (do_unlink) {
336: unlink(xauthfile);
337: rmdir(xauthdir);
338: }
339: if (xauthdir)
340: xfree(xauthdir);
341: if (xauthfile)
342: xfree(xauthfile);
343:
344: /*
345: * If we didn't get authentication data, just make up some
346: * data. The forwarding code will check the validity of the
347: * response anyway, and substitute this data. The X11
348: * server, however, will ignore this fake data and use
349: * whatever authentication mechanisms it was using otherwise
350: * for the local connection.
351: */
352: if (!got_data) {
353: u_int32_t rnd = 0;
354:
355: logit("Warning: No xauth data; "
356: "using fake authentication data for X11 forwarding.");
357: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
358: for (i = 0; i < 16; i++) {
359: if (i % 4 == 0)
360: rnd = arc4random();
361: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
362: rnd & 0xff);
363: rnd >>= 8;
364: }
365: }
1.1 deraadt 366: }
367:
1.13 markus 368: /*
369: * This is called when the interactive is entered. This checks if there is
370: * an EOF coming on stdin. We must check this explicitly, as select() does
371: * not appear to wake up when redirecting from /dev/null.
372: */
1.1 deraadt 373:
1.77 itojun 374: static void
1.49 itojun 375: client_check_initial_eof_on_stdin(void)
1.1 deraadt 376: {
1.11 markus 377: int len;
378: char buf[1];
1.1 deraadt 379:
1.13 markus 380: /*
381: * If standard input is to be "redirected from /dev/null", we simply
382: * mark that we have seen an EOF and send an EOF message to the
383: * server. Otherwise, we try to read a single character; it appears
384: * that for some files, such /dev/null, select() never wakes up for
385: * read for this descriptor, which means that we never get EOF. This
386: * way we will get the EOF if stdin comes from /dev/null or similar.
387: */
1.11 markus 388: if (stdin_null_flag) {
389: /* Fake EOF on stdin. */
390: debug("Sending eof.");
391: stdin_eof = 1;
392: packet_start(SSH_CMSG_EOF);
393: packet_send();
394: } else {
395: enter_non_blocking();
396:
397: /* Check for immediate EOF on stdin. */
398: len = read(fileno(stdin), buf, 1);
399: if (len == 0) {
1.197 djm 400: /*
401: * EOF. Record that we have seen it and send
402: * EOF to server.
403: */
1.11 markus 404: debug("Sending eof.");
405: stdin_eof = 1;
406: packet_start(SSH_CMSG_EOF);
407: packet_send();
408: } else if (len > 0) {
1.13 markus 409: /*
410: * Got data. We must store the data in the buffer,
411: * and also process it as an escape character if
412: * appropriate.
413: */
1.195 djm 414: if ((u_char) buf[0] == escape_char1)
415: escape_pending1 = 1;
1.52 markus 416: else
1.11 markus 417: buffer_append(&stdin_buffer, buf, 1);
418: }
419: leave_non_blocking();
420: }
1.1 deraadt 421: }
422:
423:
1.13 markus 424: /*
425: * Make packets from buffered stdin data, and buffer them for sending to the
426: * connection.
427: */
1.1 deraadt 428:
1.77 itojun 429: static void
1.49 itojun 430: client_make_packets_from_stdin_data(void)
1.1 deraadt 431: {
1.42 markus 432: u_int len;
1.1 deraadt 433:
1.11 markus 434: /* Send buffered stdin data to the server. */
435: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 436: packet_not_very_much_data_to_write()) {
1.11 markus 437: len = buffer_len(&stdin_buffer);
438: /* Keep the packets at reasonable size. */
439: if (len > packet_get_maxsize())
440: len = packet_get_maxsize();
441: packet_start(SSH_CMSG_STDIN_DATA);
442: packet_put_string(buffer_ptr(&stdin_buffer), len);
443: packet_send();
444: buffer_consume(&stdin_buffer, len);
445: /* If we have a pending EOF, send it now. */
446: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
447: packet_start(SSH_CMSG_EOF);
448: packet_send();
449: }
1.1 deraadt 450: }
451: }
452:
1.13 markus 453: /*
454: * Checks if the client window has changed, and sends a packet about it to
455: * the server if so. The actual change is detected elsewhere (by a software
456: * interrupt on Unix); this just checks the flag and sends a message if
457: * appropriate.
458: */
1.1 deraadt 459:
1.77 itojun 460: static void
1.49 itojun 461: client_check_window_change(void)
1.1 deraadt 462: {
1.16 markus 463: struct winsize ws;
464:
465: if (! received_window_change_signal)
466: return;
467: /** XXX race */
468: received_window_change_signal = 0;
469:
1.37 markus 470: debug2("client_check_window_change: changed");
1.16 markus 471:
472: if (compat20) {
1.123 djm 473: channel_send_window_changes();
1.16 markus 474: } else {
1.123 djm 475: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
476: return;
1.16 markus 477: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 478: packet_put_int((u_int)ws.ws_row);
479: packet_put_int((u_int)ws.ws_col);
480: packet_put_int((u_int)ws.ws_xpixel);
481: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 482: packet_send();
1.1 deraadt 483: }
484: }
485:
1.117 markus 486: static void
487: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
488: {
1.196 djm 489: struct global_confirm *gc;
490:
491: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
492: return;
493: if (gc->cb != NULL)
494: gc->cb(type, seq, gc->ctx);
495: if (--gc->ref_count <= 0) {
496: TAILQ_REMOVE(&global_confirms, gc, entry);
497: bzero(gc, sizeof(*gc));
498: xfree(gc);
499: }
500:
1.210 andreas 501: packet_set_alive_timeouts(0);
1.117 markus 502: }
503:
504: static void
505: server_alive_check(void)
506: {
1.210 andreas 507: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.176 markus 508: logit("Timeout, server not responding.");
509: cleanup_exit(255);
510: }
1.117 markus 511: packet_start(SSH2_MSG_GLOBAL_REQUEST);
512: packet_put_cstring("keepalive@openssh.com");
513: packet_put_char(1); /* boolean: want reply */
514: packet_send();
1.196 djm 515: /* Insert an empty placeholder to maintain ordering */
516: client_register_global_confirm(NULL, NULL);
1.117 markus 517: }
518:
1.13 markus 519: /*
520: * Waits until the client can do something (some data becomes available on
521: * one of the file descriptors).
522: */
1.77 itojun 523: static void
1.46 markus 524: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 525: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 526: {
1.117 markus 527: struct timeval tv, *tvp;
528: int ret;
529:
1.46 markus 530: /* Add any selections by the channel mechanism. */
1.81 markus 531: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 532:
1.16 markus 533: if (!compat20) {
1.17 markus 534: /* Read from the connection, unless our buffers are full. */
1.16 markus 535: if (buffer_len(&stdout_buffer) < buffer_high &&
536: buffer_len(&stderr_buffer) < buffer_high &&
537: channel_not_very_much_buffered_data())
1.46 markus 538: FD_SET(connection_in, *readsetp);
1.17 markus 539: /*
540: * Read from stdin, unless we have seen EOF or have very much
541: * buffered data to send to the server.
542: */
543: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 544: FD_SET(fileno(stdin), *readsetp);
1.17 markus 545:
546: /* Select stdout/stderr if have data in buffer. */
547: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 548: FD_SET(fileno(stdout), *writesetp);
1.17 markus 549: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 550: FD_SET(fileno(stderr), *writesetp);
1.16 markus 551: } else {
1.71 markus 552: /* channel_prepare_select could have closed the last channel */
1.84 markus 553: if (session_closed && !channel_still_open() &&
554: !packet_have_data_to_write()) {
555: /* clear mask since we did not call select() */
1.87 markus 556: memset(*readsetp, 0, *nallocp);
557: memset(*writesetp, 0, *nallocp);
1.84 markus 558: return;
1.71 markus 559: } else {
560: FD_SET(connection_in, *readsetp);
561: }
1.16 markus 562: }
1.11 markus 563:
564: /* Select server connection if have data to write to the server. */
565: if (packet_have_data_to_write())
1.46 markus 566: FD_SET(connection_out, *writesetp);
1.11 markus 567:
1.13 markus 568: /*
569: * Wait for something to happen. This will suspend the process until
570: * some selected descriptor can be read, written, or has some other
1.117 markus 571: * event pending.
1.13 markus 572: */
1.11 markus 573:
1.117 markus 574: if (options.server_alive_interval == 0 || !compat20)
575: tvp = NULL;
1.129 deraadt 576: else {
1.117 markus 577: tv.tv_sec = options.server_alive_interval;
578: tv.tv_usec = 0;
579: tvp = &tv;
580: }
581: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
582: if (ret < 0) {
1.11 markus 583: char buf[100];
1.51 markus 584:
585: /*
586: * We have to clear the select masks, because we return.
587: * We have to return, because the mainloop checks for the flags
588: * set by the signal handlers.
589: */
1.87 markus 590: memset(*readsetp, 0, *nallocp);
591: memset(*writesetp, 0, *nallocp);
1.50 deraadt 592:
1.11 markus 593: if (errno == EINTR)
594: return;
595: /* Note: we might still have data in the buffers. */
596: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
597: buffer_append(&stderr_buffer, buf, strlen(buf));
598: quit_pending = 1;
1.117 markus 599: } else if (ret == 0)
600: server_alive_check();
1.11 markus 601: }
602:
1.77 itojun 603: static void
1.31 markus 604: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 605: {
1.11 markus 606: /* Flush stdout and stderr buffers. */
1.31 markus 607: if (buffer_len(bout) > 0)
1.197 djm 608: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
609: buffer_len(bout));
1.31 markus 610: if (buffer_len(berr) > 0)
1.197 djm 611: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
612: buffer_len(berr));
1.11 markus 613:
1.216 djm 614: leave_raw_mode(force_tty_flag);
1.11 markus 615:
1.13 markus 616: /*
617: * Free (and clear) the buffer to reduce the amount of data that gets
618: * written to swap.
619: */
1.31 markus 620: buffer_free(bin);
621: buffer_free(bout);
622: buffer_free(berr);
1.11 markus 623:
624: /* Send the suspend signal to the program itself. */
625: kill(getpid(), SIGTSTP);
626:
1.132 djm 627: /* Reset window sizes in case they have changed */
628: received_window_change_signal = 1;
1.11 markus 629:
630: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 631: buffer_init(bin);
632: buffer_init(bout);
633: buffer_init(berr);
1.11 markus 634:
1.216 djm 635: enter_raw_mode(force_tty_flag);
1.11 markus 636: }
637:
1.77 itojun 638: static void
1.161 deraadt 639: client_process_net_input(fd_set *readset)
1.11 markus 640: {
1.212 andreas 641: int len, cont = 0;
1.17 markus 642: char buf[8192];
1.11 markus 643:
1.13 markus 644: /*
645: * Read input from the server, and add any such data to the buffer of
646: * the packet subsystem.
647: */
1.11 markus 648: if (FD_ISSET(connection_in, readset)) {
649: /* Read as much as possible. */
1.212 andreas 650: len = roaming_read(connection_in, buf, sizeof(buf), &cont);
651: if (len == 0 && cont == 0) {
1.197 djm 652: /*
653: * Received EOF. The remote host has closed the
654: * connection.
655: */
656: snprintf(buf, sizeof buf,
657: "Connection to %.300s closed by remote host.\r\n",
658: host);
1.1 deraadt 659: buffer_append(&stderr_buffer, buf, strlen(buf));
660: quit_pending = 1;
661: return;
1.11 markus 662: }
1.13 markus 663: /*
664: * There is a kernel bug on Solaris that causes select to
665: * sometimes wake up even though there is no data available.
666: */
1.53 millert 667: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 668: len = 0;
669:
670: if (len < 0) {
1.197 djm 671: /*
672: * An error has encountered. Perhaps there is a
673: * network problem.
674: */
675: snprintf(buf, sizeof buf,
676: "Read from remote host %.300s: %.100s\r\n",
677: host, strerror(errno));
1.11 markus 678: buffer_append(&stderr_buffer, buf, strlen(buf));
679: quit_pending = 1;
680: return;
681: }
682: packet_process_incoming(buf, len);
683: }
1.17 markus 684: }
1.16 markus 685:
1.97 jakob 686: static void
1.190 djm 687: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 688: {
1.190 djm 689: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
690: char errmsg[256];
691: int tochan;
692:
693: /* XXX supress on mux _client_ quietmode */
694: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 695: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 696:
697: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
698: debug2("%s request accepted on channel %d",
699: cr->request_type, c->self);
700: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
701: if (tochan) {
702: snprintf(errmsg, sizeof(errmsg),
703: "%s request failed\r\n", cr->request_type);
704: } else {
705: snprintf(errmsg, sizeof(errmsg),
706: "%s request failed on channel %d",
707: cr->request_type, c->self);
708: }
709: /* If error occurred on primary session channel, then exit */
710: if (cr->do_close && c->self == session_ident)
711: fatal("%s", errmsg);
712: /* If error occurred on mux client, append to their stderr */
713: if (tochan)
714: buffer_append(&c->extended, errmsg, strlen(errmsg));
715: else
716: error("%s", errmsg);
717: if (cr->do_close) {
718: chan_read_failed(c);
719: chan_write_failed(c);
720: }
721: }
722: xfree(cr);
723: }
724:
725: static void
726: client_abandon_status_confirm(Channel *c, void *ctx)
727: {
728: xfree(ctx);
729: }
1.129 deraadt 730:
1.190 djm 731: static void
732: client_expect_confirm(int id, const char *request, int do_close)
733: {
734: struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
1.123 djm 735:
1.190 djm 736: cr->request_type = request;
737: cr->do_close = do_close;
1.123 djm 738:
1.190 djm 739: channel_register_status_confirm(id, client_status_confirm,
740: client_abandon_status_confirm, cr);
1.196 djm 741: }
742:
743: void
744: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
745: {
1.201 djm 746: struct global_confirm *gc, *last_gc;
1.196 djm 747:
748: /* Coalesce identical callbacks */
1.201 djm 749: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
750: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
751: if (++last_gc->ref_count >= INT_MAX)
752: fatal("%s: last_gc->ref_count = %d",
753: __func__, last_gc->ref_count);
1.196 djm 754: return;
755: }
756:
757: gc = xmalloc(sizeof(*gc));
758: gc->cb = cb;
759: gc->ctx = ctx;
760: gc->ref_count = 1;
761: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 762: }
763:
764: static void
1.99 markus 765: process_cmdline(void)
1.97 jakob 766: {
767: void (*handler)(int);
1.135 djm 768: char *s, *cmd, *cancel_host;
1.121 djm 769: int delete = 0;
1.204 stevesk 770: int local = 0, remote = 0, dynamic = 0;
1.208 djm 771: int cancel_port;
1.135 djm 772: Forward fwd;
1.97 jakob 773:
1.183 djm 774: bzero(&fwd, sizeof(fwd));
775: fwd.listen_host = fwd.connect_host = NULL;
776:
1.216 djm 777: leave_raw_mode(force_tty_flag);
1.101 markus 778: handler = signal(SIGINT, SIG_IGN);
1.99 markus 779: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 780: if (s == NULL)
781: goto out;
1.179 tedu 782: while (isspace(*s))
1.97 jakob 783: s++;
1.121 djm 784: if (*s == '-')
785: s++; /* Skip cmdline '-', if any */
1.120 dtucker 786: if (*s == '\0')
1.97 jakob 787: goto out;
1.121 djm 788:
1.122 djm 789: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 790: logit("Commands:");
1.164 djm 791: logit(" -L[bind_address:]port:host:hostport "
792: "Request local forward");
793: logit(" -R[bind_address:]port:host:hostport "
794: "Request remote forward");
1.204 stevesk 795: logit(" -D[bind_address:]port "
796: "Request dynamic forward");
1.165 stevesk 797: logit(" -KR[bind_address:]port "
1.164 djm 798: "Cancel remote forward");
1.146 reyk 799: if (!options.permit_local_command)
800: goto out;
1.164 djm 801: logit(" !args "
802: "Execute local command");
1.146 reyk 803: goto out;
804: }
805:
806: if (*s == '!' && options.permit_local_command) {
807: s++;
808: ssh_local_cmd(s);
1.121 djm 809: goto out;
810: }
811:
812: if (*s == 'K') {
813: delete = 1;
814: s++;
815: }
1.204 stevesk 816: if (*s == 'L')
817: local = 1;
818: else if (*s == 'R')
819: remote = 1;
820: else if (*s == 'D')
821: dynamic = 1;
822: else {
1.109 itojun 823: logit("Invalid command.");
1.97 jakob 824: goto out;
825: }
1.204 stevesk 826:
827: if ((local || dynamic) && delete) {
1.121 djm 828: logit("Not supported.");
829: goto out;
830: }
1.204 stevesk 831: if (remote && delete && !compat20) {
1.109 itojun 832: logit("Not supported for SSH protocol version 1.");
1.97 jakob 833: goto out;
834: }
1.121 djm 835:
1.179 tedu 836: while (isspace(*++s))
837: ;
1.97 jakob 838:
1.217 djm 839: /* XXX update list of forwards in options */
1.121 djm 840: if (delete) {
1.135 djm 841: cancel_port = 0;
842: cancel_host = hpdelim(&s); /* may be NULL */
843: if (s != NULL) {
844: cancel_port = a2port(s);
845: cancel_host = cleanhostname(cancel_host);
846: } else {
847: cancel_port = a2port(cancel_host);
848: cancel_host = NULL;
1.121 djm 849: }
1.208 djm 850: if (cancel_port <= 0) {
1.135 djm 851: logit("Bad forwarding close port");
1.121 djm 852: goto out;
853: }
1.135 djm 854: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 855: } else {
1.209 djm 856: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 857: logit("Bad forwarding specification.");
858: goto out;
859: }
1.204 stevesk 860: if (local || dynamic) {
1.135 djm 861: if (channel_setup_local_fwd_listener(fwd.listen_host,
862: fwd.listen_port, fwd.connect_host,
863: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 864: logit("Port forwarding failed.");
865: goto out;
866: }
1.135 djm 867: } else {
1.167 markus 868: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 869: fwd.listen_port, fwd.connect_host,
1.167 markus 870: fwd.connect_port) < 0) {
871: logit("Port forwarding failed.");
872: goto out;
873: }
1.135 djm 874: }
875:
1.121 djm 876: logit("Forwarding port.");
877: }
878:
1.97 jakob 879: out:
880: signal(SIGINT, handler);
1.216 djm 881: enter_raw_mode(force_tty_flag);
1.97 jakob 882: if (cmd)
883: xfree(cmd);
1.183 djm 884: if (fwd.listen_host != NULL)
885: xfree(fwd.listen_host);
886: if (fwd.connect_host != NULL)
887: xfree(fwd.connect_host);
1.97 jakob 888: }
889:
1.195 djm 890: /*
891: * Process the characters one by one, call with c==NULL for proto1 case.
892: */
1.77 itojun 893: static int
1.195 djm 894: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
895: char *buf, int len)
1.31 markus 896: {
1.32 markus 897: char string[1024];
1.31 markus 898: pid_t pid;
899: int bytes = 0;
1.42 markus 900: u_int i;
901: u_char ch;
1.31 markus 902: char *s;
1.195 djm 903: int *escape_pendingp, escape_char;
904: struct escape_filter_ctx *efc;
1.31 markus 905:
1.195 djm 906: if (c == NULL) {
907: escape_pendingp = &escape_pending1;
908: escape_char = escape_char1;
909: } else {
910: if (c->filter_ctx == NULL)
911: return 0;
912: efc = (struct escape_filter_ctx *)c->filter_ctx;
913: escape_pendingp = &efc->escape_pending;
914: escape_char = efc->escape_char;
915: }
916:
1.139 djm 917: if (len <= 0)
918: return (0);
919:
920: for (i = 0; i < (u_int)len; i++) {
1.31 markus 921: /* Get one character at a time. */
922: ch = buf[i];
923:
1.195 djm 924: if (*escape_pendingp) {
1.31 markus 925: /* We have previously seen an escape character. */
926: /* Clear the flag now. */
1.195 djm 927: *escape_pendingp = 0;
1.31 markus 928:
929: /* Process the escaped character. */
930: switch (ch) {
931: case '.':
932: /* Terminate the connection. */
1.195 djm 933: snprintf(string, sizeof string, "%c.\r\n",
934: escape_char);
1.32 markus 935: buffer_append(berr, string, strlen(string));
1.31 markus 936:
1.217 djm 937: if (c && c->ctl_chan != -1) {
1.195 djm 938: chan_read_failed(c);
939: chan_write_failed(c);
940: return 0;
941: } else
942: quit_pending = 1;
1.31 markus 943: return -1;
944:
945: case 'Z' - 64:
1.195 djm 946: /* XXX support this for mux clients */
1.217 djm 947: if (c && c->ctl_chan != -1) {
1.195 djm 948: noescape:
949: snprintf(string, sizeof string,
950: "%c%c escape not available to "
951: "multiplexed sessions\r\n",
952: escape_char, ch);
953: buffer_append(berr, string,
954: strlen(string));
955: continue;
956: }
1.197 djm 957: /* Suspend the program. Inform the user */
1.195 djm 958: snprintf(string, sizeof string,
959: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 960: buffer_append(berr, string, strlen(string));
1.31 markus 961:
962: /* Restore terminal modes and suspend. */
963: client_suspend_self(bin, bout, berr);
964:
965: /* We have been continued. */
966: continue;
967:
1.111 markus 968: case 'B':
969: if (compat20) {
970: snprintf(string, sizeof string,
971: "%cB\r\n", escape_char);
972: buffer_append(berr, string,
973: strlen(string));
974: channel_request_start(session_ident,
975: "break", 0);
976: packet_put_int(1000);
977: packet_send();
978: }
979: continue;
980:
1.54 markus 981: case 'R':
1.59 markus 982: if (compat20) {
983: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 984: logit("Server does not "
985: "support re-keying");
1.59 markus 986: else
987: need_rekeying = 1;
988: }
1.54 markus 989: continue;
990:
1.31 markus 991: case '&':
1.217 djm 992: if (c && c->ctl_chan != -1)
1.195 djm 993: goto noescape;
1.31 markus 994: /*
1.197 djm 995: * Detach the program (continue to serve
996: * connections, but put in background and no
997: * more new connections).
1.31 markus 998: */
999: /* Restore tty modes. */
1.216 djm 1000: leave_raw_mode(force_tty_flag);
1.31 markus 1001:
1002: /* Stop listening for new connections. */
1.86 markus 1003: channel_stop_listening();
1.31 markus 1004:
1.86 markus 1005: snprintf(string, sizeof string,
1006: "%c& [backgrounded]\n", escape_char);
1007: buffer_append(berr, string, strlen(string));
1.31 markus 1008:
1009: /* Fork into background. */
1010: pid = fork();
1011: if (pid < 0) {
1012: error("fork: %.100s", strerror(errno));
1013: continue;
1014: }
1015: if (pid != 0) { /* This is the parent. */
1016: /* The parent just exits. */
1017: exit(0);
1018: }
1019: /* The child continues serving connections. */
1.86 markus 1020: if (compat20) {
1021: buffer_append(bin, "\004", 1);
1022: /* fake EOF on stdin */
1023: return -1;
1024: } else if (!stdin_eof) {
1025: /*
1.197 djm 1026: * Sending SSH_CMSG_EOF alone does not
1027: * always appear to be enough. So we
1028: * try to send an EOF character first.
1.86 markus 1029: */
1030: packet_start(SSH_CMSG_STDIN_DATA);
1031: packet_put_string("\004", 1);
1032: packet_send();
1033: /* Close stdin. */
1034: stdin_eof = 1;
1035: if (buffer_len(bin) == 0) {
1036: packet_start(SSH_CMSG_EOF);
1037: packet_send();
1038: }
1039: }
1040: continue;
1.31 markus 1041:
1042: case '?':
1.217 djm 1043: if (c && c->ctl_chan != -1) {
1.195 djm 1044: snprintf(string, sizeof string,
1045: "%c?\r\n\
1046: Supported escape sequences:\r\n\
1047: %c. - terminate session\r\n\
1048: %cB - send a BREAK to the remote system\r\n\
1049: %cR - Request rekey (SSH protocol 2 only)\r\n\
1050: %c# - list forwarded connections\r\n\
1051: %c? - this message\r\n\
1052: %c%c - send the escape character by typing it twice\r\n\
1053: (Note that escapes are only recognized immediately after newline.)\r\n",
1054: escape_char, escape_char,
1055: escape_char, escape_char,
1056: escape_char, escape_char,
1.206 djm 1057: escape_char, escape_char);
1.195 djm 1058: } else {
1059: snprintf(string, sizeof string,
1.31 markus 1060: "%c?\r\n\
1061: Supported escape sequences:\r\n\
1.195 djm 1062: %c. - terminate connection (and any multiplexed sessions)\r\n\
1063: %cB - send a BREAK to the remote system\r\n\
1064: %cC - open a command line\r\n\
1065: %cR - Request rekey (SSH protocol 2 only)\r\n\
1066: %c^Z - suspend ssh\r\n\
1067: %c# - list forwarded connections\r\n\
1068: %c& - background ssh (when waiting for connections to terminate)\r\n\
1069: %c? - this message\r\n\
1070: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1071: (Note that escapes are only recognized immediately after newline.)\r\n",
1.195 djm 1072: escape_char, escape_char,
1073: escape_char, escape_char,
1074: escape_char, escape_char,
1075: escape_char, escape_char,
1076: escape_char, escape_char,
1077: escape_char);
1078: }
1.32 markus 1079: buffer_append(berr, string, strlen(string));
1.31 markus 1080: continue;
1081:
1082: case '#':
1.195 djm 1083: snprintf(string, sizeof string, "%c#\r\n",
1084: escape_char);
1.32 markus 1085: buffer_append(berr, string, strlen(string));
1.31 markus 1086: s = channel_open_message();
1087: buffer_append(berr, s, strlen(s));
1088: xfree(s);
1.97 jakob 1089: continue;
1090:
1091: case 'C':
1.217 djm 1092: if (c && c->ctl_chan != -1)
1.206 djm 1093: goto noescape;
1.99 markus 1094: process_cmdline();
1.31 markus 1095: continue;
1096:
1097: default:
1098: if (ch != escape_char) {
1099: buffer_put_char(bin, escape_char);
1100: bytes++;
1101: }
1102: /* Escaped characters fall through here */
1103: break;
1104: }
1105: } else {
1106: /*
1.197 djm 1107: * The previous character was not an escape char.
1108: * Check if this is an escape.
1.31 markus 1109: */
1110: if (last_was_cr && ch == escape_char) {
1.197 djm 1111: /*
1112: * It is. Set the flag and continue to
1113: * next character.
1114: */
1.195 djm 1115: *escape_pendingp = 1;
1.31 markus 1116: continue;
1117: }
1118: }
1119:
1120: /*
1121: * Normal character. Record whether it was a newline,
1122: * and append it to the buffer.
1123: */
1124: last_was_cr = (ch == '\r' || ch == '\n');
1125: buffer_put_char(bin, ch);
1126: bytes++;
1127: }
1128: return bytes;
1129: }
1130:
1.77 itojun 1131: static void
1.161 deraadt 1132: client_process_input(fd_set *readset)
1.17 markus 1133: {
1.21 deraadt 1134: int len;
1.31 markus 1135: char buf[8192];
1.16 markus 1136:
1.11 markus 1137: /* Read input from stdin. */
1138: if (FD_ISSET(fileno(stdin), readset)) {
1139: /* Read as much as possible. */
1140: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1141: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1142: return; /* we'll try again later */
1.11 markus 1143: if (len <= 0) {
1.13 markus 1144: /*
1145: * Received EOF or error. They are treated
1146: * similarly, except that an error message is printed
1147: * if it was an error condition.
1148: */
1.11 markus 1149: if (len < 0) {
1.197 djm 1150: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1151: strerror(errno));
1.11 markus 1152: buffer_append(&stderr_buffer, buf, strlen(buf));
1153: }
1154: /* Mark that we have seen EOF. */
1155: stdin_eof = 1;
1.13 markus 1156: /*
1157: * Send an EOF message to the server unless there is
1158: * data in the buffer. If there is data in the
1159: * buffer, no message will be sent now. Code
1160: * elsewhere will send the EOF when the buffer
1161: * becomes empty if stdin_eof is set.
1162: */
1.11 markus 1163: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1164: packet_start(SSH_CMSG_EOF);
1165: packet_send();
1.11 markus 1166: }
1.195 djm 1167: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1168: /*
1169: * Normal successful read, and no escape character.
1170: * Just append the data to buffer.
1171: */
1.11 markus 1172: buffer_append(&stdin_buffer, buf, len);
1173: } else {
1.13 markus 1174: /*
1.197 djm 1175: * Normal, successful read. But we have an escape
1176: * character and have to process the characters one
1177: * by one.
1.13 markus 1178: */
1.195 djm 1179: if (process_escapes(NULL, &stdin_buffer,
1180: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1181: return;
1.11 markus 1182: }
1183: }
1184: }
1185:
1.77 itojun 1186: static void
1.161 deraadt 1187: client_process_output(fd_set *writeset)
1.11 markus 1188: {
1189: int len;
1190: char buf[100];
1.1 deraadt 1191:
1.11 markus 1192: /* Write buffered output to stdout. */
1193: if (FD_ISSET(fileno(stdout), writeset)) {
1194: /* Write as much data as possible. */
1195: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1196: buffer_len(&stdout_buffer));
1.11 markus 1197: if (len <= 0) {
1.64 markus 1198: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1199: len = 0;
1200: else {
1.13 markus 1201: /*
1202: * An error or EOF was encountered. Put an
1203: * error message to stderr buffer.
1204: */
1.197 djm 1205: snprintf(buf, sizeof buf,
1206: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1207: buffer_append(&stderr_buffer, buf, strlen(buf));
1208: quit_pending = 1;
1209: return;
1210: }
1211: }
1212: /* Consume printed data from the buffer. */
1213: buffer_consume(&stdout_buffer, len);
1214: }
1215: /* Write buffered output to stderr. */
1216: if (FD_ISSET(fileno(stderr), writeset)) {
1217: /* Write as much data as possible. */
1218: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1219: buffer_len(&stderr_buffer));
1.11 markus 1220: if (len <= 0) {
1.64 markus 1221: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1222: len = 0;
1223: else {
1.197 djm 1224: /*
1225: * EOF or error, but can't even print
1226: * error message.
1227: */
1.11 markus 1228: quit_pending = 1;
1229: return;
1230: }
1231: }
1232: /* Consume printed characters from the buffer. */
1233: buffer_consume(&stderr_buffer, len);
1234: }
1.1 deraadt 1235: }
1236:
1.13 markus 1237: /*
1.15 markus 1238: * Get packets from the connection input buffer, and process them as long as
1239: * there are packets available.
1240: *
1241: * Any unknown packets received during the actual
1242: * session cause the session to terminate. This is
1243: * intended to make debugging easier since no
1244: * confirmations are sent. Any compatible protocol
1245: * extensions must be negotiated during the
1246: * preparatory phase.
1247: */
1248:
1.77 itojun 1249: static void
1.49 itojun 1250: client_process_buffered_input_packets(void)
1.15 markus 1251: {
1.197 djm 1252: dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1253: compat20 ? xxx_kex : NULL);
1.15 markus 1254: }
1255:
1.31 markus 1256: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1257:
1.195 djm 1258: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1259: void *
1260: client_new_escape_filter_ctx(int escape_char)
1261: {
1262: struct escape_filter_ctx *ret;
1263:
1264: ret = xmalloc(sizeof(*ret));
1265: ret->escape_pending = 0;
1266: ret->escape_char = escape_char;
1267: return (void *)ret;
1268: }
1269:
1.198 djm 1270: /* Free the escape filter context on channel free */
1271: void
1272: client_filter_cleanup(int cid, void *ctx)
1273: {
1274: xfree(ctx);
1275: }
1276:
1.195 djm 1277: int
1278: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1279: {
1.190 djm 1280: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1281: return 0;
1282:
1.195 djm 1283: return process_escapes(c, &c->input, &c->output, &c->extended,
1284: buf, len);
1.30 markus 1285: }
1286:
1.77 itojun 1287: static void
1.60 markus 1288: client_channel_closed(int id, void *arg)
1289: {
1.83 markus 1290: channel_cancel_cleanup(id);
1.60 markus 1291: session_closed = 1;
1.216 djm 1292: leave_raw_mode(force_tty_flag);
1.60 markus 1293: }
1294:
1.15 markus 1295: /*
1.13 markus 1296: * Implements the interactive session with the server. This is called after
1297: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1298: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1299: * used as an escape character for terminating or suspending the session.
1.13 markus 1300: */
1.1 deraadt 1301:
1.20 markus 1302: int
1.30 markus 1303: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1304: {
1.46 markus 1305: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1306: double start_time, total_time;
1.130 avsm 1307: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1.200 markus 1308: u_int64_t ibytes, obytes;
1.130 avsm 1309: u_int nalloc = 0;
1.11 markus 1310: char buf[100];
1311:
1312: debug("Entering interactive session.");
1313:
1314: start_time = get_current_time();
1315:
1316: /* Initialize variables. */
1.195 djm 1317: escape_pending1 = 0;
1.11 markus 1318: last_was_cr = 1;
1319: exit_status = -1;
1320: stdin_eof = 0;
1321: buffer_high = 64 * 1024;
1322: connection_in = packet_get_connection_in();
1323: connection_out = packet_get_connection_out();
1.46 markus 1324: max_fd = MAX(connection_in, connection_out);
1325:
1326: if (!compat20) {
1.63 markus 1327: /* enable nonblocking unless tty */
1328: if (!isatty(fileno(stdin)))
1329: set_nonblock(fileno(stdin));
1330: if (!isatty(fileno(stdout)))
1331: set_nonblock(fileno(stdout));
1332: if (!isatty(fileno(stderr)))
1333: set_nonblock(fileno(stderr));
1.46 markus 1334: max_fd = MAX(max_fd, fileno(stdin));
1335: max_fd = MAX(max_fd, fileno(stdout));
1336: max_fd = MAX(max_fd, fileno(stderr));
1337: }
1.11 markus 1338: quit_pending = 0;
1.195 djm 1339: escape_char1 = escape_char_arg;
1.11 markus 1340:
1341: /* Initialize buffers. */
1342: buffer_init(&stdin_buffer);
1343: buffer_init(&stdout_buffer);
1344: buffer_init(&stderr_buffer);
1345:
1.15 markus 1346: client_init_dispatch();
1347:
1.105 markus 1348: /*
1349: * Set signal handlers, (e.g. to restore non-blocking mode)
1350: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1351: */
1.131 djm 1352: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1353: signal(SIGHUP, signal_handler);
1.105 markus 1354: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1355: signal(SIGINT, signal_handler);
1356: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1357: signal(SIGQUIT, signal_handler);
1358: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1359: signal(SIGTERM, signal_handler);
1.132 djm 1360: signal(SIGWINCH, window_change_handler);
1.11 markus 1361:
1362: if (have_pty)
1.216 djm 1363: enter_raw_mode(force_tty_flag);
1.11 markus 1364:
1.48 markus 1365: if (compat20) {
1366: session_ident = ssh2_chan_id;
1.195 djm 1367: if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1.48 markus 1368: channel_register_filter(session_ident,
1.195 djm 1369: client_simple_escape_filter, NULL,
1.198 djm 1370: client_filter_cleanup,
1.195 djm 1371: client_new_escape_filter_ctx(escape_char_arg));
1.60 markus 1372: if (session_ident != -1)
1373: channel_register_cleanup(session_ident,
1.143 djm 1374: client_channel_closed, 0);
1.48 markus 1375: } else {
1376: /* Check if we should immediately send eof on stdin. */
1.16 markus 1377: client_check_initial_eof_on_stdin();
1.48 markus 1378: }
1.30 markus 1379:
1.11 markus 1380: /* Main loop of the client for the interactive session mode. */
1381: while (!quit_pending) {
1382:
1.13 markus 1383: /* Process buffered packets sent by the server. */
1.11 markus 1384: client_process_buffered_input_packets();
1385:
1.60 markus 1386: if (compat20 && session_closed && !channel_still_open())
1387: break;
1388:
1.56 markus 1389: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1390:
1.56 markus 1391: if (rekeying) {
1392: debug("rekeying in progress");
1393: } else {
1394: /*
1395: * Make packets of buffered stdin data, and buffer
1396: * them for sending to the server.
1397: */
1398: if (!compat20)
1399: client_make_packets_from_stdin_data();
1.11 markus 1400:
1.56 markus 1401: /*
1402: * Make packets from buffered channel data, and
1403: * enqueue them for sending to the server.
1404: */
1405: if (packet_not_very_much_data_to_write())
1406: channel_output_poll();
1.11 markus 1407:
1.56 markus 1408: /*
1409: * Check if the window size has changed, and buffer a
1410: * message about it to the server if so.
1411: */
1412: client_check_window_change();
1.11 markus 1413:
1.56 markus 1414: if (quit_pending)
1415: break;
1416: }
1.13 markus 1417: /*
1418: * Wait until we have something to do (something becomes
1419: * available on one of the descriptors).
1420: */
1.81 markus 1421: max_fd2 = max_fd;
1.56 markus 1422: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1423: &max_fd2, &nalloc, rekeying);
1.11 markus 1424:
1425: if (quit_pending)
1426: break;
1427:
1.56 markus 1428: /* Do channel operations unless rekeying in progress. */
1429: if (!rekeying) {
1430: channel_after_select(readset, writeset);
1.108 markus 1431: if (need_rekeying || packet_need_rekeying()) {
1432: debug("need rekeying");
1.56 markus 1433: xxx_kex->done = 0;
1434: kex_send_kexinit(xxx_kex);
1435: need_rekeying = 0;
1436: }
1437: }
1.11 markus 1438:
1.17 markus 1439: /* Buffer input from the connection. */
1.46 markus 1440: client_process_net_input(readset);
1.17 markus 1441:
1442: if (quit_pending)
1443: break;
1.11 markus 1444:
1.17 markus 1445: if (!compat20) {
1446: /* Buffer data from stdin */
1.46 markus 1447: client_process_input(readset);
1.17 markus 1448: /*
1449: * Process output to stdout and stderr. Output to
1450: * the connection is processed elsewhere (above).
1451: */
1.46 markus 1452: client_process_output(writeset);
1.214 andreas 1453: }
1454:
1455: if (session_resumed) {
1456: connection_in = packet_get_connection_in();
1457: connection_out = packet_get_connection_out();
1458: max_fd = MAX(max_fd, connection_out);
1459: max_fd = MAX(max_fd, connection_in);
1460: session_resumed = 0;
1.17 markus 1461: }
1.11 markus 1462:
1.197 djm 1463: /*
1464: * Send as much buffered packet data as possible to the
1465: * sender.
1466: */
1.46 markus 1467: if (FD_ISSET(connection_out, writeset))
1.11 markus 1468: packet_write_poll();
1469: }
1.46 markus 1470: if (readset)
1471: xfree(readset);
1472: if (writeset)
1473: xfree(writeset);
1.11 markus 1474:
1475: /* Terminate the session. */
1476:
1477: /* Stop watching for window change. */
1.132 djm 1478: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1479:
1.213 stevesk 1480: if (compat20) {
1481: packet_start(SSH2_MSG_DISCONNECT);
1482: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1483: packet_put_cstring("disconnected by user");
1.219 djm 1484: packet_put_cstring(""); /* language tag */
1.213 stevesk 1485: packet_send();
1486: packet_write_wait();
1487: }
1.11 markus 1488:
1.76 markus 1489: channel_free_all();
1.11 markus 1490:
1.75 markus 1491: if (have_pty)
1.216 djm 1492: leave_raw_mode(force_tty_flag);
1.75 markus 1493:
1494: /* restore blocking io */
1495: if (!isatty(fileno(stdin)))
1496: unset_nonblock(fileno(stdin));
1497: if (!isatty(fileno(stdout)))
1498: unset_nonblock(fileno(stdout));
1499: if (!isatty(fileno(stderr)))
1500: unset_nonblock(fileno(stderr));
1.116 dtucker 1501:
1502: /*
1503: * If there was no shell or command requested, there will be no remote
1504: * exit status to be returned. In that case, clear error code if the
1505: * connection was deliberately terminated at this end.
1506: */
1507: if (no_shell_flag && received_signal == SIGTERM) {
1508: received_signal = 0;
1509: exit_status = 0;
1510: }
1.75 markus 1511:
1.113 markus 1512: if (received_signal)
1.89 itojun 1513: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1514:
1.13 markus 1515: /*
1516: * In interactive mode (with pseudo tty) display a message indicating
1517: * that the connection has been closed.
1518: */
1.11 markus 1519: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1520: snprintf(buf, sizeof buf,
1521: "Connection to %.64s closed.\r\n", host);
1.11 markus 1522: buffer_append(&stderr_buffer, buf, strlen(buf));
1523: }
1.70 markus 1524:
1.11 markus 1525: /* Output any buffered data for stdout. */
1.70 markus 1526: while (buffer_len(&stdout_buffer) > 0) {
1527: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1528: buffer_len(&stdout_buffer));
1.70 markus 1529: if (len <= 0) {
1.11 markus 1530: error("Write failed flushing stdout buffer.");
1.70 markus 1531: break;
1532: }
1.11 markus 1533: buffer_consume(&stdout_buffer, len);
1534: }
1535:
1536: /* Output any buffered data for stderr. */
1.70 markus 1537: while (buffer_len(&stderr_buffer) > 0) {
1538: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1539: buffer_len(&stderr_buffer));
1.70 markus 1540: if (len <= 0) {
1.11 markus 1541: error("Write failed flushing stderr buffer.");
1.70 markus 1542: break;
1543: }
1.11 markus 1544: buffer_consume(&stderr_buffer, len);
1545: }
1546:
1547: /* Clear and free any buffers. */
1548: memset(buf, 0, sizeof(buf));
1549: buffer_free(&stdin_buffer);
1550: buffer_free(&stdout_buffer);
1551: buffer_free(&stderr_buffer);
1552:
1553: /* Report bytes transferred, and transfer rates. */
1554: total_time = get_current_time() - start_time;
1.200 markus 1555: packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1556: packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1557: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1558: obytes, ibytes, total_time);
1.11 markus 1559: if (total_time > 0)
1.200 markus 1560: verbose("Bytes per second: sent %.1f, received %.1f",
1561: obytes / total_time, ibytes / total_time);
1.11 markus 1562: /* Return the exit status of the program. */
1563: debug("Exit status %d", exit_status);
1564: return exit_status;
1.15 markus 1565: }
1566:
1567: /*********/
1568:
1.77 itojun 1569: static void
1.94 markus 1570: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1571: {
1.42 markus 1572: u_int data_len;
1.15 markus 1573: char *data = packet_get_string(&data_len);
1.93 markus 1574: packet_check_eom();
1.15 markus 1575: buffer_append(&stdout_buffer, data, data_len);
1576: memset(data, 0, data_len);
1577: xfree(data);
1578: }
1.77 itojun 1579: static void
1.94 markus 1580: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1581: {
1.42 markus 1582: u_int data_len;
1.15 markus 1583: char *data = packet_get_string(&data_len);
1.93 markus 1584: packet_check_eom();
1.15 markus 1585: buffer_append(&stderr_buffer, data, data_len);
1586: memset(data, 0, data_len);
1587: xfree(data);
1588: }
1.77 itojun 1589: static void
1.94 markus 1590: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1591: {
1592: exit_status = packet_get_int();
1.93 markus 1593: packet_check_eom();
1.15 markus 1594: /* Acknowledge the exit. */
1595: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1596: packet_send();
1597: /*
1598: * Must wait for packet to be sent since we are
1599: * exiting the loop.
1600: */
1601: packet_write_wait();
1602: /* Flag that we want to exit. */
1603: quit_pending = 1;
1604: }
1.115 markus 1605: static void
1606: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1607: {
1608: Channel *c = NULL;
1609: int remote_id, sock;
1610:
1611: /* Read the remote channel number from the message. */
1612: remote_id = packet_get_int();
1613: packet_check_eom();
1614:
1615: /*
1616: * Get a connection to the local authentication agent (this may again
1617: * get forwarded).
1618: */
1619: sock = ssh_get_authentication_socket();
1620:
1621: /*
1622: * If we could not connect the agent, send an error message back to
1623: * the server. This should never happen unless the agent dies,
1624: * because authentication forwarding is only enabled if we have an
1625: * agent.
1626: */
1627: if (sock >= 0) {
1628: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1629: -1, 0, 0, 0, "authentication agent connection", 1);
1630: c->remote_id = remote_id;
1631: c->force_drain = 1;
1632: }
1633: if (c == NULL) {
1634: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1635: packet_put_int(remote_id);
1636: } else {
1637: /* Send a confirmation to the remote host. */
1638: debug("Forwarding authentication connection.");
1639: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1640: packet_put_int(remote_id);
1641: packet_put_int(c->self);
1642: }
1643: packet_send();
1644: }
1.15 markus 1645:
1.77 itojun 1646: static Channel *
1.40 markus 1647: client_request_forwarded_tcpip(const char *request_type, int rchan)
1648: {
1.103 deraadt 1649: Channel *c = NULL;
1.40 markus 1650: char *listen_address, *originator_address;
1.208 djm 1651: u_short listen_port, originator_port;
1.40 markus 1652:
1653: /* Get rest of the packet */
1654: listen_address = packet_get_string(NULL);
1655: listen_port = packet_get_int();
1656: originator_address = packet_get_string(NULL);
1657: originator_port = packet_get_int();
1.93 markus 1658: packet_check_eom();
1.40 markus 1659:
1.191 djm 1660: debug("client_request_forwarded_tcpip: listen %s port %d, "
1661: "originator %s port %d", listen_address, listen_port,
1662: originator_address, originator_port);
1663:
1664: c = channel_connect_by_listen_address(listen_port,
1665: "forwarded-tcpip", originator_address);
1.40 markus 1666:
1667: xfree(originator_address);
1668: xfree(listen_address);
1669: return c;
1670: }
1671:
1.103 deraadt 1672: static Channel *
1.40 markus 1673: client_request_x11(const char *request_type, int rchan)
1674: {
1675: Channel *c = NULL;
1676: char *originator;
1.208 djm 1677: u_short originator_port;
1.67 markus 1678: int sock;
1.40 markus 1679:
1680: if (!options.forward_x11) {
1681: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1682: error("Warning: this is probably a break-in attempt by a "
1683: "malicious server.");
1.221 ! djm 1684: return NULL;
! 1685: }
! 1686: if (x11_refuse_time != 0 && time(NULL) >= x11_refuse_time) {
! 1687: verbose("Rejected X11 connection after ForwardX11Timeout "
! 1688: "expired");
1.40 markus 1689: return NULL;
1690: }
1691: originator = packet_get_string(NULL);
1692: if (datafellows & SSH_BUG_X11FWD) {
1693: debug2("buggy server: x11 request w/o originator_port");
1694: originator_port = 0;
1695: } else {
1696: originator_port = packet_get_int();
1697: }
1.93 markus 1698: packet_check_eom();
1.40 markus 1699: /* XXX check permission */
1.47 markus 1700: debug("client_request_x11: request from %s %d", originator,
1701: originator_port);
1.67 markus 1702: xfree(originator);
1.40 markus 1703: sock = x11_connect_display();
1.67 markus 1704: if (sock < 0)
1705: return NULL;
1706: c = channel_new("x11",
1707: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1708: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1709: c->force_drain = 1;
1.40 markus 1710: return c;
1711: }
1712:
1.103 deraadt 1713: static Channel *
1.40 markus 1714: client_request_agent(const char *request_type, int rchan)
1715: {
1716: Channel *c = NULL;
1.67 markus 1717: int sock;
1.40 markus 1718:
1719: if (!options.forward_agent) {
1720: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1721: error("Warning: this is probably a break-in attempt by a "
1722: "malicious server.");
1.40 markus 1723: return NULL;
1724: }
1.177 stevesk 1725: sock = ssh_get_authentication_socket();
1.67 markus 1726: if (sock < 0)
1727: return NULL;
1728: c = channel_new("authentication agent connection",
1729: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1730: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1731: "authentication agent connection", 1);
1.82 markus 1732: c->force_drain = 1;
1.40 markus 1733: return c;
1.180 djm 1734: }
1735:
1736: int
1737: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1738: {
1739: Channel *c;
1740: int fd;
1741:
1742: if (tun_mode == SSH_TUNMODE_NO)
1743: return 0;
1744:
1745: if (!compat20) {
1.207 stevesk 1746: error("Tunnel forwarding is not supported for protocol 1");
1.180 djm 1747: return -1;
1748: }
1749:
1750: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1751:
1752: /* Open local tunnel device */
1753: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1754: error("Tunnel device open failed.");
1755: return -1;
1756: }
1757:
1758: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1759: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1760: c->datagram = 1;
1761:
1762: packet_start(SSH2_MSG_CHANNEL_OPEN);
1763: packet_put_cstring("tun@openssh.com");
1764: packet_put_int(c->self);
1765: packet_put_int(c->local_window_max);
1766: packet_put_int(c->local_maxpacket);
1767: packet_put_int(tun_mode);
1768: packet_put_int(remote_tun);
1769: packet_send();
1770:
1771: return 0;
1.40 markus 1772: }
1773:
1.22 markus 1774: /* XXXX move to generic input handler */
1.77 itojun 1775: static void
1.94 markus 1776: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1777: {
1778: Channel *c = NULL;
1779: char *ctype;
1780: int rchan;
1.102 markus 1781: u_int rmaxpack, rwindow, len;
1.22 markus 1782:
1783: ctype = packet_get_string(&len);
1784: rchan = packet_get_int();
1785: rwindow = packet_get_int();
1786: rmaxpack = packet_get_int();
1787:
1.24 markus 1788: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1789: ctype, rchan, rwindow, rmaxpack);
1790:
1.40 markus 1791: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1792: c = client_request_forwarded_tcpip(ctype, rchan);
1793: } else if (strcmp(ctype, "x11") == 0) {
1794: c = client_request_x11(ctype, rchan);
1795: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1796: c = client_request_agent(ctype, rchan);
1.22 markus 1797: }
1798: /* XXX duplicate : */
1799: if (c != NULL) {
1800: debug("confirm %s", ctype);
1801: c->remote_id = rchan;
1802: c->remote_window = rwindow;
1803: c->remote_maxpacket = rmaxpack;
1.69 markus 1804: if (c->type != SSH_CHANNEL_CONNECTING) {
1805: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1806: packet_put_int(c->remote_id);
1807: packet_put_int(c->self);
1808: packet_put_int(c->local_window);
1809: packet_put_int(c->local_maxpacket);
1810: packet_send();
1811: }
1.22 markus 1812: } else {
1813: debug("failure %s", ctype);
1814: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1815: packet_put_int(rchan);
1816: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1817: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1818: packet_put_cstring("open failed");
1.66 markus 1819: packet_put_cstring("");
1820: }
1.22 markus 1821: packet_send();
1822: }
1823: xfree(ctype);
1824: }
1.77 itojun 1825: static void
1.94 markus 1826: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1827: {
1828: Channel *c = NULL;
1.123 djm 1829: int exitval, id, reply, success = 0;
1.48 markus 1830: char *rtype;
1831:
1832: id = packet_get_int();
1833: rtype = packet_get_string(NULL);
1834: reply = packet_get_char();
1835:
1836: debug("client_input_channel_req: channel %d rtype %s reply %d",
1837: id, rtype, reply);
1838:
1.128 djm 1839: if (id == -1) {
1840: error("client_input_channel_req: request for channel -1");
1841: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 1842: error("client_input_channel_req: channel %d: "
1843: "unknown channel", id);
1.193 markus 1844: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1845: packet_check_eom();
1846: chan_rcvd_eow(c);
1.48 markus 1847: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1848: exitval = packet_get_int();
1.217 djm 1849: if (c->ctl_chan != -1) {
1850: mux_exit_message(c, exitval);
1.215 djm 1851: success = 1;
1852: } else if (id == session_ident) {
1853: /* Record exit value of local session */
1.123 djm 1854: success = 1;
1855: exit_status = exitval;
1.215 djm 1856: } else {
1.218 djm 1857: /* Probably for a mux channel that has already closed */
1858: debug("%s: no sink for exit-status on channel %d",
1859: __func__, id);
1.123 djm 1860: }
1.93 markus 1861: packet_check_eom();
1.48 markus 1862: }
1863: if (reply) {
1864: packet_start(success ?
1865: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 1866: packet_put_int(c->remote_id);
1.48 markus 1867: packet_send();
1868: }
1869: xfree(rtype);
1870: }
1.95 markus 1871: static void
1872: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1873: {
1874: char *rtype;
1875: int want_reply;
1876: int success = 0;
1877:
1878: rtype = packet_get_string(NULL);
1879: want_reply = packet_get_char();
1.117 markus 1880: debug("client_input_global_request: rtype %s want_reply %d",
1881: rtype, want_reply);
1.95 markus 1882: if (want_reply) {
1883: packet_start(success ?
1884: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1885: packet_send();
1886: packet_write_wait();
1887: }
1888: xfree(rtype);
1889: }
1.22 markus 1890:
1.123 djm 1891: void
1.129 deraadt 1892: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 1893: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 1894: {
1895: int len;
1.132 djm 1896: Channel *c = NULL;
1.123 djm 1897:
1898: debug2("%s: id %d", __func__, id);
1899:
1.132 djm 1900: if ((c = channel_lookup(id)) == NULL)
1901: fatal("client_session2_setup: channel %d: unknown channel", id);
1902:
1.123 djm 1903: if (want_tty) {
1904: struct winsize ws;
1905:
1906: /* Store window size in the packet. */
1907: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1908: memset(&ws, 0, sizeof(ws));
1909:
1.190 djm 1910: channel_request_start(id, "pty-req", 1);
1.220 djm 1911: client_expect_confirm(id, "PTY allocation", 1);
1.123 djm 1912: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1913: packet_put_int((u_int)ws.ws_col);
1914: packet_put_int((u_int)ws.ws_row);
1915: packet_put_int((u_int)ws.ws_xpixel);
1916: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 1917: if (tiop == NULL)
1918: tiop = get_saved_tio();
1919: tty_make_modes(-1, tiop);
1.123 djm 1920: packet_send();
1921: /* XXX wait for reply */
1.132 djm 1922: c->client_tty = 1;
1.123 djm 1923: }
1924:
1925: /* Transfer any environment variables from client to server */
1.126 djm 1926: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1927: int i, j, matched;
1928: char *name, *val;
1929:
1930: debug("Sending environment.");
1.126 djm 1931: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1932: /* Split */
1.126 djm 1933: name = xstrdup(env[i]);
1.123 djm 1934: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1935: xfree(name);
1.123 djm 1936: continue;
1937: }
1938: *val++ = '\0';
1939:
1940: matched = 0;
1941: for (j = 0; j < options.num_send_env; j++) {
1942: if (match_pattern(name, options.send_env[j])) {
1943: matched = 1;
1944: break;
1945: }
1946: }
1947: if (!matched) {
1948: debug3("Ignored env %s", name);
1.144 stevesk 1949: xfree(name);
1.123 djm 1950: continue;
1951: }
1952:
1953: debug("Sending env %s = %s", name, val);
1954: channel_request_start(id, "env", 0);
1955: packet_put_cstring(name);
1956: packet_put_cstring(val);
1957: packet_send();
1.144 stevesk 1958: xfree(name);
1.123 djm 1959: }
1960: }
1961:
1962: len = buffer_len(cmd);
1963: if (len > 0) {
1964: if (len > 900)
1965: len = 900;
1966: if (want_subsystem) {
1.190 djm 1967: debug("Sending subsystem: %.*s",
1968: len, (u_char*)buffer_ptr(cmd));
1969: channel_request_start(id, "subsystem", 1);
1970: client_expect_confirm(id, "subsystem", 1);
1.123 djm 1971: } else {
1.190 djm 1972: debug("Sending command: %.*s",
1973: len, (u_char*)buffer_ptr(cmd));
1974: channel_request_start(id, "exec", 1);
1975: client_expect_confirm(id, "exec", 1);
1.123 djm 1976: }
1977: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1978: packet_send();
1979: } else {
1.190 djm 1980: channel_request_start(id, "shell", 1);
1981: client_expect_confirm(id, "shell", 1);
1.123 djm 1982: packet_send();
1983: }
1984: }
1985:
1.77 itojun 1986: static void
1.49 itojun 1987: client_init_dispatch_20(void)
1.16 markus 1988: {
1.55 markus 1989: dispatch_init(&dispatch_protocol_error);
1.100 markus 1990:
1.16 markus 1991: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1992: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1993: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1994: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1995: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1996: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1997: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1998: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1999: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2000: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2001: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2002: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2003:
2004: /* rekeying */
2005: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2006:
2007: /* global request reply messages */
2008: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2009: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2010: }
1.197 djm 2011:
1.77 itojun 2012: static void
1.49 itojun 2013: client_init_dispatch_13(void)
1.15 markus 2014: {
2015: dispatch_init(NULL);
2016: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2017: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2018: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2019: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2020: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2021: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2022: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2023: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2024: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2025:
2026: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2027: &client_input_agent_open : &deny_input_open);
1.39 markus 2028: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2029: &x11_input_open : &deny_input_open);
1.15 markus 2030: }
1.197 djm 2031:
1.77 itojun 2032: static void
1.49 itojun 2033: client_init_dispatch_15(void)
1.15 markus 2034: {
2035: client_init_dispatch_13();
2036: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2037: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2038: }
1.197 djm 2039:
1.79 stevesk 2040: static void
1.49 itojun 2041: client_init_dispatch(void)
1.15 markus 2042: {
1.16 markus 2043: if (compat20)
2044: client_init_dispatch_20();
2045: else if (compat13)
1.15 markus 2046: client_init_dispatch_13();
2047: else
2048: client_init_dispatch_15();
1.113 markus 2049: }
2050:
2051: /* client specific fatal cleanup */
2052: void
1.114 markus 2053: cleanup_exit(int i)
1.113 markus 2054: {
1.216 djm 2055: leave_raw_mode(force_tty_flag);
1.113 markus 2056: leave_non_blocking();
1.192 djm 2057: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2058: unlink(options.control_path);
1.114 markus 2059: _exit(i);
1.1 deraadt 2060: }
![[BACK]](/icons/back.gif){kind=icon}
Return to clientloop.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh