Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.197
1.197 ! djm 1: /* $OpenBSD: clientloop.c,v 1.196 2008/06/12 04:06:00 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 "monitor_fdpass.h"
103: #include "match.h"
104: #include "msg.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 */
1.192 djm 116: extern int muxserver_sock;
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:
1.13 markus 125: /*
126: * Flag to indicate that we have received a window change signal which has
127: * not yet been processed. This will cause a message indicating the new
128: * window size to be sent to the server a little later. This is volatile
129: * because this is updated in a signal handler.
130: */
1.88 markus 131: static volatile sig_atomic_t received_window_change_signal = 0;
132: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 133:
1.145 djm 134: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 135: static int in_non_blocking_mode = 0;
136:
137: /* Common data for the client loop code. */
1.162 djm 138: static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.195 djm 139: static int escape_char1; /* Escape character. (proto1 only) */
140: static int escape_pending1; /* Last character was an escape (proto1 only) */
1.11 markus 141: static int last_was_cr; /* Last character was a newline. */
1.197 ! djm 142: static int exit_status; /* Used to store the command exit status. */
! 143: static int stdin_eof; /* EOF has been encountered on stderr. */
1.11 markus 144: static Buffer stdin_buffer; /* Buffer for stdin data. */
145: static Buffer stdout_buffer; /* Buffer for stdout data. */
146: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 147: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
148: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 149: static int connection_in; /* Connection to server (input). */
150: static int connection_out; /* Connection to server (output). */
1.56 markus 151: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 152: static int session_closed = 0; /* In SSH2: login session closed. */
1.1 deraadt 153:
1.77 itojun 154: static void client_init_dispatch(void);
1.16 markus 155: int session_ident = -1;
156:
1.195 djm 157: /* Track escape per proto2 channel */
158: struct escape_filter_ctx {
159: int escape_pending;
160: int escape_char;
161: };
162:
163: /* Context for channel confirmation replies */
1.190 djm 164: struct channel_reply_ctx {
165: const char *request_type;
166: int id, do_close;
167: };
168:
1.196 djm 169: /* Global request success/failure callbacks */
170: struct global_confirm {
171: TAILQ_ENTRY(global_confirm) entry;
172: global_confirm_cb *cb;
173: void *ctx;
174: int ref_count;
175: };
176: TAILQ_HEAD(global_confirms, global_confirm);
177: static struct global_confirms global_confirms =
178: TAILQ_HEAD_INITIALIZER(global_confirms);
179:
1.54 markus 180: /*XXX*/
181: extern Kex *xxx_kex;
182:
1.123 djm 183: void ssh_process_session2_setup(int, int, int, Buffer *);
184:
1.1 deraadt 185: /* Restores stdin to blocking mode. */
186:
1.77 itojun 187: static void
1.49 itojun 188: leave_non_blocking(void)
1.1 deraadt 189: {
1.11 markus 190: if (in_non_blocking_mode) {
1.125 djm 191: unset_nonblock(fileno(stdin));
1.11 markus 192: in_non_blocking_mode = 0;
193: }
1.1 deraadt 194: }
195:
1.11 markus 196: /* Puts stdin terminal in non-blocking mode. */
197:
1.77 itojun 198: static void
1.49 itojun 199: enter_non_blocking(void)
1.1 deraadt 200: {
1.11 markus 201: in_non_blocking_mode = 1;
1.124 djm 202: set_nonblock(fileno(stdin));
1.1 deraadt 203: }
204:
1.13 markus 205: /*
206: * Signal handler for the window change signal (SIGWINCH). This just sets a
207: * flag indicating that the window has changed.
208: */
1.157 deraadt 209: /*ARGSUSED */
1.77 itojun 210: static void
1.11 markus 211: window_change_handler(int sig)
1.1 deraadt 212: {
1.11 markus 213: received_window_change_signal = 1;
214: signal(SIGWINCH, window_change_handler);
1.1 deraadt 215: }
216:
1.13 markus 217: /*
218: * Signal handler for signals that cause the program to terminate. These
219: * signals must be trapped to restore terminal modes.
220: */
1.157 deraadt 221: /*ARGSUSED */
1.77 itojun 222: static void
1.11 markus 223: signal_handler(int sig)
1.1 deraadt 224: {
1.75 markus 225: received_signal = sig;
226: quit_pending = 1;
1.1 deraadt 227: }
228:
1.13 markus 229: /*
230: * Returns current time in seconds from Jan 1, 1970 with the maximum
231: * available resolution.
232: */
1.1 deraadt 233:
1.77 itojun 234: static double
1.49 itojun 235: get_current_time(void)
1.1 deraadt 236: {
1.11 markus 237: struct timeval tv;
238: gettimeofday(&tv, NULL);
239: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 240: }
241:
242: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
243: void
244: client_x11_get_proto(const char *display, const char *xauth_path,
245: u_int trusted, char **_proto, char **_data)
246: {
247: char cmd[1024];
248: char line[512];
249: char xdisplay[512];
250: static char proto[512], data[512];
251: FILE *f;
252: int got_data = 0, generated = 0, do_unlink = 0, i;
253: char *xauthdir, *xauthfile;
254: struct stat st;
255:
256: xauthdir = xauthfile = NULL;
257: *_proto = proto;
258: *_data = data;
259: proto[0] = data[0] = '\0';
260:
261: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
262: debug("No xauth program.");
263: } else {
264: if (display == NULL) {
265: debug("x11_get_proto: DISPLAY not set");
266: return;
267: }
268: /*
269: * Handle FamilyLocal case where $DISPLAY does
270: * not match an authorization entry. For this we
271: * just try "xauth list unix:displaynum.screennum".
272: * XXX: "localhost" match to determine FamilyLocal
273: * is not perfect.
274: */
275: if (strncmp(display, "localhost:", 10) == 0) {
276: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
277: display + 10);
278: display = xdisplay;
279: }
280: if (trusted == 0) {
281: xauthdir = xmalloc(MAXPATHLEN);
282: xauthfile = xmalloc(MAXPATHLEN);
283: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
284: if (mkdtemp(xauthdir) != NULL) {
285: do_unlink = 1;
286: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
287: xauthdir);
288: snprintf(cmd, sizeof(cmd),
289: "%s -f %s generate %s " SSH_X11_PROTO
290: " untrusted timeout 1200 2>" _PATH_DEVNULL,
291: xauth_path, xauthfile, display);
292: debug2("x11_get_proto: %s", cmd);
293: if (system(cmd) == 0)
294: generated = 1;
295: }
296: }
1.181 markus 297:
298: /*
299: * When in untrusted mode, we read the cookie only if it was
300: * successfully generated as an untrusted one in the step
301: * above.
302: */
303: if (trusted || generated) {
304: snprintf(cmd, sizeof(cmd),
305: "%s %s%s list %s 2>" _PATH_DEVNULL,
306: xauth_path,
307: generated ? "-f " : "" ,
308: generated ? xauthfile : "",
309: display);
310: debug2("x11_get_proto: %s", cmd);
311: f = popen(cmd, "r");
312: if (f && fgets(line, sizeof(line), f) &&
313: sscanf(line, "%*s %511s %511s", proto, data) == 2)
314: got_data = 1;
315: if (f)
316: pclose(f);
317: } else
318: error("Warning: untrusted X11 forwarding setup failed: "
319: "xauth key data not generated");
1.138 djm 320: }
321:
322: if (do_unlink) {
323: unlink(xauthfile);
324: rmdir(xauthdir);
325: }
326: if (xauthdir)
327: xfree(xauthdir);
328: if (xauthfile)
329: xfree(xauthfile);
330:
331: /*
332: * If we didn't get authentication data, just make up some
333: * data. The forwarding code will check the validity of the
334: * response anyway, and substitute this data. The X11
335: * server, however, will ignore this fake data and use
336: * whatever authentication mechanisms it was using otherwise
337: * for the local connection.
338: */
339: if (!got_data) {
340: u_int32_t rnd = 0;
341:
342: logit("Warning: No xauth data; "
343: "using fake authentication data for X11 forwarding.");
344: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
345: for (i = 0; i < 16; i++) {
346: if (i % 4 == 0)
347: rnd = arc4random();
348: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
349: rnd & 0xff);
350: rnd >>= 8;
351: }
352: }
1.1 deraadt 353: }
354:
1.13 markus 355: /*
356: * This is called when the interactive is entered. This checks if there is
357: * an EOF coming on stdin. We must check this explicitly, as select() does
358: * not appear to wake up when redirecting from /dev/null.
359: */
1.1 deraadt 360:
1.77 itojun 361: static void
1.49 itojun 362: client_check_initial_eof_on_stdin(void)
1.1 deraadt 363: {
1.11 markus 364: int len;
365: char buf[1];
1.1 deraadt 366:
1.13 markus 367: /*
368: * If standard input is to be "redirected from /dev/null", we simply
369: * mark that we have seen an EOF and send an EOF message to the
370: * server. Otherwise, we try to read a single character; it appears
371: * that for some files, such /dev/null, select() never wakes up for
372: * read for this descriptor, which means that we never get EOF. This
373: * way we will get the EOF if stdin comes from /dev/null or similar.
374: */
1.11 markus 375: if (stdin_null_flag) {
376: /* Fake EOF on stdin. */
377: debug("Sending eof.");
378: stdin_eof = 1;
379: packet_start(SSH_CMSG_EOF);
380: packet_send();
381: } else {
382: enter_non_blocking();
383:
384: /* Check for immediate EOF on stdin. */
385: len = read(fileno(stdin), buf, 1);
386: if (len == 0) {
1.197 ! djm 387: /*
! 388: * EOF. Record that we have seen it and send
! 389: * EOF to server.
! 390: */
1.11 markus 391: debug("Sending eof.");
392: stdin_eof = 1;
393: packet_start(SSH_CMSG_EOF);
394: packet_send();
395: } else if (len > 0) {
1.13 markus 396: /*
397: * Got data. We must store the data in the buffer,
398: * and also process it as an escape character if
399: * appropriate.
400: */
1.195 djm 401: if ((u_char) buf[0] == escape_char1)
402: escape_pending1 = 1;
1.52 markus 403: else
1.11 markus 404: buffer_append(&stdin_buffer, buf, 1);
405: }
406: leave_non_blocking();
407: }
1.1 deraadt 408: }
409:
410:
1.13 markus 411: /*
412: * Make packets from buffered stdin data, and buffer them for sending to the
413: * connection.
414: */
1.1 deraadt 415:
1.77 itojun 416: static void
1.49 itojun 417: client_make_packets_from_stdin_data(void)
1.1 deraadt 418: {
1.42 markus 419: u_int len;
1.1 deraadt 420:
1.11 markus 421: /* Send buffered stdin data to the server. */
422: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 423: packet_not_very_much_data_to_write()) {
1.11 markus 424: len = buffer_len(&stdin_buffer);
425: /* Keep the packets at reasonable size. */
426: if (len > packet_get_maxsize())
427: len = packet_get_maxsize();
428: packet_start(SSH_CMSG_STDIN_DATA);
429: packet_put_string(buffer_ptr(&stdin_buffer), len);
430: packet_send();
431: buffer_consume(&stdin_buffer, len);
1.52 markus 432: stdin_bytes += len;
1.11 markus 433: /* If we have a pending EOF, send it now. */
434: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
435: packet_start(SSH_CMSG_EOF);
436: packet_send();
437: }
1.1 deraadt 438: }
439: }
440:
1.13 markus 441: /*
442: * Checks if the client window has changed, and sends a packet about it to
443: * the server if so. The actual change is detected elsewhere (by a software
444: * interrupt on Unix); this just checks the flag and sends a message if
445: * appropriate.
446: */
1.1 deraadt 447:
1.77 itojun 448: static void
1.49 itojun 449: client_check_window_change(void)
1.1 deraadt 450: {
1.16 markus 451: struct winsize ws;
452:
453: if (! received_window_change_signal)
454: return;
455: /** XXX race */
456: received_window_change_signal = 0;
457:
1.37 markus 458: debug2("client_check_window_change: changed");
1.16 markus 459:
460: if (compat20) {
1.123 djm 461: channel_send_window_changes();
1.16 markus 462: } else {
1.123 djm 463: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
464: return;
1.16 markus 465: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 466: packet_put_int((u_int)ws.ws_row);
467: packet_put_int((u_int)ws.ws_col);
468: packet_put_int((u_int)ws.ws_xpixel);
469: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 470: packet_send();
1.1 deraadt 471: }
472: }
473:
1.117 markus 474: static void
475: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
476: {
1.196 djm 477: struct global_confirm *gc;
478:
479: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
480: return;
481: if (gc->cb != NULL)
482: gc->cb(type, seq, gc->ctx);
483: if (--gc->ref_count <= 0) {
484: TAILQ_REMOVE(&global_confirms, gc, entry);
485: bzero(gc, sizeof(*gc));
486: xfree(gc);
487: }
488:
1.188 dtucker 489: keep_alive_timeouts = 0;
1.117 markus 490: }
491:
492: static void
493: server_alive_check(void)
494: {
1.188 dtucker 495: if (++keep_alive_timeouts > options.server_alive_count_max) {
1.176 markus 496: logit("Timeout, server not responding.");
497: cleanup_exit(255);
498: }
1.117 markus 499: packet_start(SSH2_MSG_GLOBAL_REQUEST);
500: packet_put_cstring("keepalive@openssh.com");
501: packet_put_char(1); /* boolean: want reply */
502: packet_send();
1.196 djm 503: /* Insert an empty placeholder to maintain ordering */
504: client_register_global_confirm(NULL, NULL);
1.117 markus 505: }
506:
1.13 markus 507: /*
508: * Waits until the client can do something (some data becomes available on
509: * one of the file descriptors).
510: */
1.77 itojun 511: static void
1.46 markus 512: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 513: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 514: {
1.117 markus 515: struct timeval tv, *tvp;
516: int ret;
517:
1.46 markus 518: /* Add any selections by the channel mechanism. */
1.81 markus 519: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 520:
1.16 markus 521: if (!compat20) {
1.17 markus 522: /* Read from the connection, unless our buffers are full. */
1.16 markus 523: if (buffer_len(&stdout_buffer) < buffer_high &&
524: buffer_len(&stderr_buffer) < buffer_high &&
525: channel_not_very_much_buffered_data())
1.46 markus 526: FD_SET(connection_in, *readsetp);
1.17 markus 527: /*
528: * Read from stdin, unless we have seen EOF or have very much
529: * buffered data to send to the server.
530: */
531: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 532: FD_SET(fileno(stdin), *readsetp);
1.17 markus 533:
534: /* Select stdout/stderr if have data in buffer. */
535: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 536: FD_SET(fileno(stdout), *writesetp);
1.17 markus 537: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 538: FD_SET(fileno(stderr), *writesetp);
1.16 markus 539: } else {
1.71 markus 540: /* channel_prepare_select could have closed the last channel */
1.84 markus 541: if (session_closed && !channel_still_open() &&
542: !packet_have_data_to_write()) {
543: /* clear mask since we did not call select() */
1.87 markus 544: memset(*readsetp, 0, *nallocp);
545: memset(*writesetp, 0, *nallocp);
1.84 markus 546: return;
1.71 markus 547: } else {
548: FD_SET(connection_in, *readsetp);
549: }
1.16 markus 550: }
1.11 markus 551:
552: /* Select server connection if have data to write to the server. */
553: if (packet_have_data_to_write())
1.46 markus 554: FD_SET(connection_out, *writesetp);
1.11 markus 555:
1.192 djm 556: if (muxserver_sock != -1)
557: FD_SET(muxserver_sock, *readsetp);
1.123 djm 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:
605: leave_raw_mode();
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:
626: enter_raw_mode();
627: }
628:
1.77 itojun 629: static void
1.161 deraadt 630: client_process_net_input(fd_set *readset)
1.11 markus 631: {
1.17 markus 632: int len;
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. */
641: len = read(connection_in, buf, sizeof(buf));
642: if (len == 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 &&
686: c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
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: {
737: struct global_confirm *gc, *first_gc;
738:
739: /* Coalesce identical callbacks */
740: first_gc = TAILQ_FIRST(&global_confirms);
741: if (first_gc && first_gc->cb == cb && first_gc->ctx == ctx) {
742: if (++first_gc->ref_count >= INT_MAX)
743: fatal("%s: first_gc->ref_count = %d",
744: __func__, first_gc->ref_count);
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;
1.97 jakob 761: int local = 0;
1.135 djm 762: u_short cancel_port;
763: Forward fwd;
1.97 jakob 764:
1.183 djm 765: bzero(&fwd, sizeof(fwd));
766: fwd.listen_host = fwd.connect_host = NULL;
767:
1.97 jakob 768: leave_raw_mode();
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");
1.165 stevesk 786: logit(" -KR[bind_address:]port "
1.164 djm 787: "Cancel remote forward");
1.146 reyk 788: if (!options.permit_local_command)
789: goto out;
1.164 djm 790: logit(" !args "
791: "Execute local command");
1.146 reyk 792: goto out;
793: }
794:
795: if (*s == '!' && options.permit_local_command) {
796: s++;
797: ssh_local_cmd(s);
1.121 djm 798: goto out;
799: }
800:
801: if (*s == 'K') {
802: delete = 1;
803: s++;
804: }
805: if (*s != 'L' && *s != 'R') {
1.109 itojun 806: logit("Invalid command.");
1.97 jakob 807: goto out;
808: }
1.121 djm 809: if (*s == 'L')
1.97 jakob 810: local = 1;
1.121 djm 811: if (local && delete) {
812: logit("Not supported.");
813: goto out;
814: }
815: if ((!local || delete) && !compat20) {
1.109 itojun 816: logit("Not supported for SSH protocol version 1.");
1.97 jakob 817: goto out;
818: }
1.121 djm 819:
1.179 tedu 820: while (isspace(*++s))
821: ;
1.97 jakob 822:
1.121 djm 823: if (delete) {
1.135 djm 824: cancel_port = 0;
825: cancel_host = hpdelim(&s); /* may be NULL */
826: if (s != NULL) {
827: cancel_port = a2port(s);
828: cancel_host = cleanhostname(cancel_host);
829: } else {
830: cancel_port = a2port(cancel_host);
831: cancel_host = NULL;
1.121 djm 832: }
1.135 djm 833: if (cancel_port == 0) {
834: logit("Bad forwarding close port");
1.121 djm 835: goto out;
836: }
1.135 djm 837: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 838: } else {
1.135 djm 839: if (!parse_forward(&fwd, s)) {
1.121 djm 840: logit("Bad forwarding specification.");
841: goto out;
842: }
843: if (local) {
1.135 djm 844: if (channel_setup_local_fwd_listener(fwd.listen_host,
845: fwd.listen_port, fwd.connect_host,
846: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 847: logit("Port forwarding failed.");
848: goto out;
849: }
1.135 djm 850: } else {
1.167 markus 851: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 852: fwd.listen_port, fwd.connect_host,
1.167 markus 853: fwd.connect_port) < 0) {
854: logit("Port forwarding failed.");
855: goto out;
856: }
1.135 djm 857: }
858:
1.121 djm 859: logit("Forwarding port.");
860: }
861:
1.97 jakob 862: out:
863: signal(SIGINT, handler);
864: enter_raw_mode();
865: if (cmd)
866: xfree(cmd);
1.183 djm 867: if (fwd.listen_host != NULL)
868: xfree(fwd.listen_host);
869: if (fwd.connect_host != NULL)
870: xfree(fwd.connect_host);
1.97 jakob 871: }
872:
1.195 djm 873: /*
874: * Process the characters one by one, call with c==NULL for proto1 case.
875: */
1.77 itojun 876: static int
1.195 djm 877: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
878: char *buf, int len)
1.31 markus 879: {
1.32 markus 880: char string[1024];
1.31 markus 881: pid_t pid;
882: int bytes = 0;
1.42 markus 883: u_int i;
884: u_char ch;
1.31 markus 885: char *s;
1.195 djm 886: int *escape_pendingp, escape_char;
887: struct escape_filter_ctx *efc;
1.31 markus 888:
1.195 djm 889: if (c == NULL) {
890: escape_pendingp = &escape_pending1;
891: escape_char = escape_char1;
892: } else {
893: if (c->filter_ctx == NULL)
894: return 0;
895: efc = (struct escape_filter_ctx *)c->filter_ctx;
896: escape_pendingp = &efc->escape_pending;
897: escape_char = efc->escape_char;
898: }
899:
1.139 djm 900: if (len <= 0)
901: return (0);
902:
903: for (i = 0; i < (u_int)len; i++) {
1.31 markus 904: /* Get one character at a time. */
905: ch = buf[i];
906:
1.195 djm 907: if (*escape_pendingp) {
1.31 markus 908: /* We have previously seen an escape character. */
909: /* Clear the flag now. */
1.195 djm 910: *escape_pendingp = 0;
1.31 markus 911:
912: /* Process the escaped character. */
913: switch (ch) {
914: case '.':
915: /* Terminate the connection. */
1.195 djm 916: snprintf(string, sizeof string, "%c.\r\n",
917: escape_char);
1.32 markus 918: buffer_append(berr, string, strlen(string));
1.31 markus 919:
1.195 djm 920: if (c && c->ctl_fd != -1) {
921: chan_read_failed(c);
922: chan_write_failed(c);
923: return 0;
924: } else
925: quit_pending = 1;
1.31 markus 926: return -1;
927:
928: case 'Z' - 64:
1.195 djm 929: /* XXX support this for mux clients */
930: if (c && c->ctl_fd != -1) {
931: noescape:
932: snprintf(string, sizeof string,
933: "%c%c escape not available to "
934: "multiplexed sessions\r\n",
935: escape_char, ch);
936: buffer_append(berr, string,
937: strlen(string));
938: continue;
939: }
1.197 ! djm 940: /* Suspend the program. Inform the user */
1.195 djm 941: snprintf(string, sizeof string,
942: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 943: buffer_append(berr, string, strlen(string));
1.31 markus 944:
945: /* Restore terminal modes and suspend. */
946: client_suspend_self(bin, bout, berr);
947:
948: /* We have been continued. */
949: continue;
950:
1.111 markus 951: case 'B':
952: if (compat20) {
953: snprintf(string, sizeof string,
954: "%cB\r\n", escape_char);
955: buffer_append(berr, string,
956: strlen(string));
957: channel_request_start(session_ident,
958: "break", 0);
959: packet_put_int(1000);
960: packet_send();
961: }
962: continue;
963:
1.54 markus 964: case 'R':
1.59 markus 965: if (compat20) {
966: if (datafellows & SSH_BUG_NOREKEY)
1.197 ! djm 967: logit("Server does not "
! 968: "support re-keying");
1.59 markus 969: else
970: need_rekeying = 1;
971: }
1.54 markus 972: continue;
973:
1.31 markus 974: case '&':
1.195 djm 975: if (c && c->ctl_fd != -1)
976: goto noescape;
1.31 markus 977: /*
1.197 ! djm 978: * Detach the program (continue to serve
! 979: * connections, but put in background and no
! 980: * more new connections).
1.31 markus 981: */
982: /* Restore tty modes. */
983: leave_raw_mode();
984:
985: /* Stop listening for new connections. */
1.86 markus 986: channel_stop_listening();
1.31 markus 987:
1.86 markus 988: snprintf(string, sizeof string,
989: "%c& [backgrounded]\n", escape_char);
990: buffer_append(berr, string, strlen(string));
1.31 markus 991:
992: /* Fork into background. */
993: pid = fork();
994: if (pid < 0) {
995: error("fork: %.100s", strerror(errno));
996: continue;
997: }
998: if (pid != 0) { /* This is the parent. */
999: /* The parent just exits. */
1000: exit(0);
1001: }
1002: /* The child continues serving connections. */
1.86 markus 1003: if (compat20) {
1004: buffer_append(bin, "\004", 1);
1005: /* fake EOF on stdin */
1006: return -1;
1007: } else if (!stdin_eof) {
1008: /*
1.197 ! djm 1009: * Sending SSH_CMSG_EOF alone does not
! 1010: * always appear to be enough. So we
! 1011: * try to send an EOF character first.
1.86 markus 1012: */
1013: packet_start(SSH_CMSG_STDIN_DATA);
1014: packet_put_string("\004", 1);
1015: packet_send();
1016: /* Close stdin. */
1017: stdin_eof = 1;
1018: if (buffer_len(bin) == 0) {
1019: packet_start(SSH_CMSG_EOF);
1020: packet_send();
1021: }
1022: }
1023: continue;
1.31 markus 1024:
1025: case '?':
1.195 djm 1026: if (c && c->ctl_fd != -1) {
1027: snprintf(string, sizeof string,
1028: "%c?\r\n\
1029: Supported escape sequences:\r\n\
1030: %c. - terminate session\r\n\
1031: %cB - send a BREAK to the remote system\r\n\
1032: %cC - open a command line\r\n\
1033: %cR - Request rekey (SSH protocol 2 only)\r\n\
1034: %c# - list forwarded connections\r\n\
1035: %c? - this message\r\n\
1036: %c%c - send the escape character by typing it twice\r\n\
1037: (Note that escapes are only recognized immediately after newline.)\r\n",
1038: escape_char, escape_char,
1039: escape_char, escape_char,
1040: escape_char, escape_char,
1041: escape_char, escape_char,
1042: escape_char);
1043: } else {
1044: snprintf(string, sizeof string,
1.31 markus 1045: "%c?\r\n\
1046: Supported escape sequences:\r\n\
1.195 djm 1047: %c. - terminate connection (and any multiplexed sessions)\r\n\
1048: %cB - send a BREAK to the remote system\r\n\
1049: %cC - open a command line\r\n\
1050: %cR - Request rekey (SSH protocol 2 only)\r\n\
1051: %c^Z - suspend ssh\r\n\
1052: %c# - list forwarded connections\r\n\
1053: %c& - background ssh (when waiting for connections to terminate)\r\n\
1054: %c? - this message\r\n\
1055: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1056: (Note that escapes are only recognized immediately after newline.)\r\n",
1.195 djm 1057: escape_char, escape_char,
1058: escape_char, escape_char,
1059: escape_char, escape_char,
1060: escape_char, escape_char,
1061: escape_char, escape_char,
1062: escape_char);
1063: }
1.32 markus 1064: buffer_append(berr, string, strlen(string));
1.31 markus 1065: continue;
1066:
1067: case '#':
1.195 djm 1068: snprintf(string, sizeof string, "%c#\r\n",
1069: escape_char);
1.32 markus 1070: buffer_append(berr, string, strlen(string));
1.31 markus 1071: s = channel_open_message();
1072: buffer_append(berr, s, strlen(s));
1073: xfree(s);
1.97 jakob 1074: continue;
1075:
1076: case 'C':
1.99 markus 1077: process_cmdline();
1.31 markus 1078: continue;
1079:
1080: default:
1081: if (ch != escape_char) {
1082: buffer_put_char(bin, escape_char);
1083: bytes++;
1084: }
1085: /* Escaped characters fall through here */
1086: break;
1087: }
1088: } else {
1089: /*
1.197 ! djm 1090: * The previous character was not an escape char.
! 1091: * Check if this is an escape.
1.31 markus 1092: */
1093: if (last_was_cr && ch == escape_char) {
1.197 ! djm 1094: /*
! 1095: * It is. Set the flag and continue to
! 1096: * next character.
! 1097: */
1.195 djm 1098: *escape_pendingp = 1;
1.31 markus 1099: continue;
1100: }
1101: }
1102:
1103: /*
1104: * Normal character. Record whether it was a newline,
1105: * and append it to the buffer.
1106: */
1107: last_was_cr = (ch == '\r' || ch == '\n');
1108: buffer_put_char(bin, ch);
1109: bytes++;
1110: }
1111: return bytes;
1112: }
1113:
1.77 itojun 1114: static void
1.161 deraadt 1115: client_process_input(fd_set *readset)
1.17 markus 1116: {
1.21 deraadt 1117: int len;
1.31 markus 1118: char buf[8192];
1.16 markus 1119:
1.11 markus 1120: /* Read input from stdin. */
1121: if (FD_ISSET(fileno(stdin), readset)) {
1122: /* Read as much as possible. */
1123: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1124: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1125: return; /* we'll try again later */
1.11 markus 1126: if (len <= 0) {
1.13 markus 1127: /*
1128: * Received EOF or error. They are treated
1129: * similarly, except that an error message is printed
1130: * if it was an error condition.
1131: */
1.11 markus 1132: if (len < 0) {
1.197 ! djm 1133: snprintf(buf, sizeof buf, "read: %.100s\r\n",
! 1134: strerror(errno));
1.11 markus 1135: buffer_append(&stderr_buffer, buf, strlen(buf));
1136: }
1137: /* Mark that we have seen EOF. */
1138: stdin_eof = 1;
1.13 markus 1139: /*
1140: * Send an EOF message to the server unless there is
1141: * data in the buffer. If there is data in the
1142: * buffer, no message will be sent now. Code
1143: * elsewhere will send the EOF when the buffer
1144: * becomes empty if stdin_eof is set.
1145: */
1.11 markus 1146: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1147: packet_start(SSH_CMSG_EOF);
1148: packet_send();
1.11 markus 1149: }
1.195 djm 1150: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1151: /*
1152: * Normal successful read, and no escape character.
1153: * Just append the data to buffer.
1154: */
1.11 markus 1155: buffer_append(&stdin_buffer, buf, len);
1156: } else {
1.13 markus 1157: /*
1.197 ! djm 1158: * Normal, successful read. But we have an escape
! 1159: * character and have to process the characters one
! 1160: * by one.
1.13 markus 1161: */
1.195 djm 1162: if (process_escapes(NULL, &stdin_buffer,
1163: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1164: return;
1.11 markus 1165: }
1166: }
1167: }
1168:
1.77 itojun 1169: static void
1.161 deraadt 1170: client_process_output(fd_set *writeset)
1.11 markus 1171: {
1172: int len;
1173: char buf[100];
1.1 deraadt 1174:
1.11 markus 1175: /* Write buffered output to stdout. */
1176: if (FD_ISSET(fileno(stdout), writeset)) {
1177: /* Write as much data as possible. */
1178: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1179: buffer_len(&stdout_buffer));
1.11 markus 1180: if (len <= 0) {
1.64 markus 1181: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1182: len = 0;
1183: else {
1.13 markus 1184: /*
1185: * An error or EOF was encountered. Put an
1186: * error message to stderr buffer.
1187: */
1.197 ! djm 1188: snprintf(buf, sizeof buf,
! 1189: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1190: buffer_append(&stderr_buffer, buf, strlen(buf));
1191: quit_pending = 1;
1192: return;
1193: }
1194: }
1195: /* Consume printed data from the buffer. */
1196: buffer_consume(&stdout_buffer, len);
1.57 markus 1197: stdout_bytes += len;
1.11 markus 1198: }
1199: /* Write buffered output to stderr. */
1200: if (FD_ISSET(fileno(stderr), writeset)) {
1201: /* Write as much data as possible. */
1202: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1203: buffer_len(&stderr_buffer));
1.11 markus 1204: if (len <= 0) {
1.64 markus 1205: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1206: len = 0;
1207: else {
1.197 ! djm 1208: /*
! 1209: * EOF or error, but can't even print
! 1210: * error message.
! 1211: */
1.11 markus 1212: quit_pending = 1;
1213: return;
1214: }
1215: }
1216: /* Consume printed characters from the buffer. */
1217: buffer_consume(&stderr_buffer, len);
1.57 markus 1218: stderr_bytes += len;
1.11 markus 1219: }
1.1 deraadt 1220: }
1221:
1.13 markus 1222: /*
1.15 markus 1223: * Get packets from the connection input buffer, and process them as long as
1224: * there are packets available.
1225: *
1226: * Any unknown packets received during the actual
1227: * session cause the session to terminate. This is
1228: * intended to make debugging easier since no
1229: * confirmations are sent. Any compatible protocol
1230: * extensions must be negotiated during the
1231: * preparatory phase.
1232: */
1233:
1.77 itojun 1234: static void
1.49 itojun 1235: client_process_buffered_input_packets(void)
1.15 markus 1236: {
1.197 ! djm 1237: dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
! 1238: compat20 ? xxx_kex : NULL);
1.15 markus 1239: }
1240:
1.31 markus 1241: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1242:
1.195 djm 1243: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1244: void *
1245: client_new_escape_filter_ctx(int escape_char)
1246: {
1247: struct escape_filter_ctx *ret;
1248:
1249: ret = xmalloc(sizeof(*ret));
1250: ret->escape_pending = 0;
1251: ret->escape_char = escape_char;
1252: return (void *)ret;
1253: }
1254:
1255: int
1256: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1257: {
1.190 djm 1258: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1259: return 0;
1260:
1.195 djm 1261: return process_escapes(c, &c->input, &c->output, &c->extended,
1262: buf, len);
1.30 markus 1263: }
1264:
1.77 itojun 1265: static void
1.60 markus 1266: client_channel_closed(int id, void *arg)
1267: {
1.83 markus 1268: channel_cancel_cleanup(id);
1.60 markus 1269: session_closed = 1;
1.113 markus 1270: leave_raw_mode();
1.60 markus 1271: }
1272:
1.15 markus 1273: /*
1.13 markus 1274: * Implements the interactive session with the server. This is called after
1275: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1276: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1277: * used as an escape character for terminating or suspending the session.
1.13 markus 1278: */
1.1 deraadt 1279:
1.20 markus 1280: int
1.30 markus 1281: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1282: {
1.46 markus 1283: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1284: double start_time, total_time;
1.130 avsm 1285: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1286: u_int nalloc = 0;
1.11 markus 1287: char buf[100];
1288:
1289: debug("Entering interactive session.");
1290:
1291: start_time = get_current_time();
1292:
1293: /* Initialize variables. */
1.195 djm 1294: escape_pending1 = 0;
1.11 markus 1295: last_was_cr = 1;
1296: exit_status = -1;
1297: stdin_eof = 0;
1298: buffer_high = 64 * 1024;
1299: connection_in = packet_get_connection_in();
1300: connection_out = packet_get_connection_out();
1.46 markus 1301: max_fd = MAX(connection_in, connection_out);
1.192 djm 1302: if (muxserver_sock != -1)
1303: max_fd = MAX(max_fd, muxserver_sock);
1.46 markus 1304:
1305: if (!compat20) {
1.63 markus 1306: /* enable nonblocking unless tty */
1307: if (!isatty(fileno(stdin)))
1308: set_nonblock(fileno(stdin));
1309: if (!isatty(fileno(stdout)))
1310: set_nonblock(fileno(stdout));
1311: if (!isatty(fileno(stderr)))
1312: set_nonblock(fileno(stderr));
1.46 markus 1313: max_fd = MAX(max_fd, fileno(stdin));
1314: max_fd = MAX(max_fd, fileno(stdout));
1315: max_fd = MAX(max_fd, fileno(stderr));
1316: }
1.11 markus 1317: stdin_bytes = 0;
1318: stdout_bytes = 0;
1319: stderr_bytes = 0;
1320: quit_pending = 0;
1.195 djm 1321: escape_char1 = escape_char_arg;
1.11 markus 1322:
1323: /* Initialize buffers. */
1324: buffer_init(&stdin_buffer);
1325: buffer_init(&stdout_buffer);
1326: buffer_init(&stderr_buffer);
1327:
1.15 markus 1328: client_init_dispatch();
1329:
1.105 markus 1330: /*
1331: * Set signal handlers, (e.g. to restore non-blocking mode)
1332: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1333: */
1.131 djm 1334: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1335: signal(SIGHUP, signal_handler);
1.105 markus 1336: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1337: signal(SIGINT, signal_handler);
1338: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1339: signal(SIGQUIT, signal_handler);
1340: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1341: signal(SIGTERM, signal_handler);
1.132 djm 1342: signal(SIGWINCH, window_change_handler);
1.11 markus 1343:
1344: if (have_pty)
1345: enter_raw_mode();
1346:
1.48 markus 1347: if (compat20) {
1348: session_ident = ssh2_chan_id;
1.195 djm 1349: if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1.48 markus 1350: channel_register_filter(session_ident,
1.195 djm 1351: client_simple_escape_filter, NULL,
1352: client_new_escape_filter_ctx(escape_char_arg));
1.60 markus 1353: if (session_ident != -1)
1354: channel_register_cleanup(session_ident,
1.143 djm 1355: client_channel_closed, 0);
1.48 markus 1356: } else {
1357: /* Check if we should immediately send eof on stdin. */
1.16 markus 1358: client_check_initial_eof_on_stdin();
1.48 markus 1359: }
1.30 markus 1360:
1.11 markus 1361: /* Main loop of the client for the interactive session mode. */
1362: while (!quit_pending) {
1363:
1.13 markus 1364: /* Process buffered packets sent by the server. */
1.11 markus 1365: client_process_buffered_input_packets();
1366:
1.60 markus 1367: if (compat20 && session_closed && !channel_still_open())
1368: break;
1369:
1.56 markus 1370: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1371:
1.56 markus 1372: if (rekeying) {
1373: debug("rekeying in progress");
1374: } else {
1375: /*
1376: * Make packets of buffered stdin data, and buffer
1377: * them for sending to the server.
1378: */
1379: if (!compat20)
1380: client_make_packets_from_stdin_data();
1.11 markus 1381:
1.56 markus 1382: /*
1383: * Make packets from buffered channel data, and
1384: * enqueue them for sending to the server.
1385: */
1386: if (packet_not_very_much_data_to_write())
1387: channel_output_poll();
1.11 markus 1388:
1.56 markus 1389: /*
1390: * Check if the window size has changed, and buffer a
1391: * message about it to the server if so.
1392: */
1393: client_check_window_change();
1.11 markus 1394:
1.56 markus 1395: if (quit_pending)
1396: break;
1397: }
1.13 markus 1398: /*
1399: * Wait until we have something to do (something becomes
1400: * available on one of the descriptors).
1401: */
1.81 markus 1402: max_fd2 = max_fd;
1.56 markus 1403: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1404: &max_fd2, &nalloc, rekeying);
1.11 markus 1405:
1406: if (quit_pending)
1407: break;
1408:
1.56 markus 1409: /* Do channel operations unless rekeying in progress. */
1410: if (!rekeying) {
1411: channel_after_select(readset, writeset);
1.108 markus 1412: if (need_rekeying || packet_need_rekeying()) {
1413: debug("need rekeying");
1.56 markus 1414: xxx_kex->done = 0;
1415: kex_send_kexinit(xxx_kex);
1416: need_rekeying = 0;
1417: }
1418: }
1.11 markus 1419:
1.17 markus 1420: /* Buffer input from the connection. */
1.46 markus 1421: client_process_net_input(readset);
1.17 markus 1422:
1.123 djm 1423: /* Accept control connections. */
1.192 djm 1424: if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1425: if (muxserver_accept_control())
1426: quit_pending = 1;
1427: }
1.123 djm 1428:
1.17 markus 1429: if (quit_pending)
1430: break;
1.11 markus 1431:
1.17 markus 1432: if (!compat20) {
1433: /* Buffer data from stdin */
1.46 markus 1434: client_process_input(readset);
1.17 markus 1435: /*
1436: * Process output to stdout and stderr. Output to
1437: * the connection is processed elsewhere (above).
1438: */
1.46 markus 1439: client_process_output(writeset);
1.17 markus 1440: }
1.11 markus 1441:
1.197 ! djm 1442: /*
! 1443: * Send as much buffered packet data as possible to the
! 1444: * sender.
! 1445: */
1.46 markus 1446: if (FD_ISSET(connection_out, writeset))
1.11 markus 1447: packet_write_poll();
1448: }
1.46 markus 1449: if (readset)
1450: xfree(readset);
1451: if (writeset)
1452: xfree(writeset);
1.11 markus 1453:
1454: /* Terminate the session. */
1455:
1456: /* Stop watching for window change. */
1.132 djm 1457: signal(SIGWINCH, SIG_DFL);
1.11 markus 1458:
1.76 markus 1459: channel_free_all();
1.11 markus 1460:
1.75 markus 1461: if (have_pty)
1462: leave_raw_mode();
1463:
1464: /* restore blocking io */
1465: if (!isatty(fileno(stdin)))
1466: unset_nonblock(fileno(stdin));
1467: if (!isatty(fileno(stdout)))
1468: unset_nonblock(fileno(stdout));
1469: if (!isatty(fileno(stderr)))
1470: unset_nonblock(fileno(stderr));
1.116 dtucker 1471:
1472: /*
1473: * If there was no shell or command requested, there will be no remote
1474: * exit status to be returned. In that case, clear error code if the
1475: * connection was deliberately terminated at this end.
1476: */
1477: if (no_shell_flag && received_signal == SIGTERM) {
1478: received_signal = 0;
1479: exit_status = 0;
1480: }
1.75 markus 1481:
1.113 markus 1482: if (received_signal)
1.89 itojun 1483: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1484:
1.13 markus 1485: /*
1486: * In interactive mode (with pseudo tty) display a message indicating
1487: * that the connection has been closed.
1488: */
1.11 markus 1489: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 ! djm 1490: snprintf(buf, sizeof buf,
! 1491: "Connection to %.64s closed.\r\n", host);
1.11 markus 1492: buffer_append(&stderr_buffer, buf, strlen(buf));
1493: }
1.70 markus 1494:
1.11 markus 1495: /* Output any buffered data for stdout. */
1.70 markus 1496: while (buffer_len(&stdout_buffer) > 0) {
1497: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1498: buffer_len(&stdout_buffer));
1.70 markus 1499: if (len <= 0) {
1.11 markus 1500: error("Write failed flushing stdout buffer.");
1.70 markus 1501: break;
1502: }
1.11 markus 1503: buffer_consume(&stdout_buffer, len);
1.57 markus 1504: stdout_bytes += len;
1.11 markus 1505: }
1506:
1507: /* Output any buffered data for stderr. */
1.70 markus 1508: while (buffer_len(&stderr_buffer) > 0) {
1509: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1510: buffer_len(&stderr_buffer));
1.70 markus 1511: if (len <= 0) {
1.11 markus 1512: error("Write failed flushing stderr buffer.");
1.70 markus 1513: break;
1514: }
1.11 markus 1515: buffer_consume(&stderr_buffer, len);
1.57 markus 1516: stderr_bytes += len;
1.11 markus 1517: }
1518:
1519: /* Clear and free any buffers. */
1520: memset(buf, 0, sizeof(buf));
1521: buffer_free(&stdin_buffer);
1522: buffer_free(&stdout_buffer);
1523: buffer_free(&stderr_buffer);
1524:
1525: /* Report bytes transferred, and transfer rates. */
1526: total_time = get_current_time() - start_time;
1.197 ! djm 1527: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f "
! 1528: "seconds", stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1529: if (total_time > 0)
1530: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1531: stdin_bytes / total_time, stdout_bytes / total_time,
1532: stderr_bytes / total_time);
1.11 markus 1533:
1534: /* Return the exit status of the program. */
1535: debug("Exit status %d", exit_status);
1536: return exit_status;
1.15 markus 1537: }
1538:
1539: /*********/
1540:
1.77 itojun 1541: static void
1.94 markus 1542: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1543: {
1.42 markus 1544: u_int data_len;
1.15 markus 1545: char *data = packet_get_string(&data_len);
1.93 markus 1546: packet_check_eom();
1.15 markus 1547: buffer_append(&stdout_buffer, data, data_len);
1548: memset(data, 0, data_len);
1549: xfree(data);
1550: }
1.77 itojun 1551: static void
1.94 markus 1552: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1553: {
1.42 markus 1554: u_int data_len;
1.15 markus 1555: char *data = packet_get_string(&data_len);
1.93 markus 1556: packet_check_eom();
1.15 markus 1557: buffer_append(&stderr_buffer, data, data_len);
1558: memset(data, 0, data_len);
1559: xfree(data);
1560: }
1.77 itojun 1561: static void
1.94 markus 1562: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1563: {
1564: exit_status = packet_get_int();
1.93 markus 1565: packet_check_eom();
1.15 markus 1566: /* Acknowledge the exit. */
1567: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1568: packet_send();
1569: /*
1570: * Must wait for packet to be sent since we are
1571: * exiting the loop.
1572: */
1573: packet_write_wait();
1574: /* Flag that we want to exit. */
1575: quit_pending = 1;
1576: }
1.115 markus 1577: static void
1578: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1579: {
1580: Channel *c = NULL;
1581: int remote_id, sock;
1582:
1583: /* Read the remote channel number from the message. */
1584: remote_id = packet_get_int();
1585: packet_check_eom();
1586:
1587: /*
1588: * Get a connection to the local authentication agent (this may again
1589: * get forwarded).
1590: */
1591: sock = ssh_get_authentication_socket();
1592:
1593: /*
1594: * If we could not connect the agent, send an error message back to
1595: * the server. This should never happen unless the agent dies,
1596: * because authentication forwarding is only enabled if we have an
1597: * agent.
1598: */
1599: if (sock >= 0) {
1600: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1601: -1, 0, 0, 0, "authentication agent connection", 1);
1602: c->remote_id = remote_id;
1603: c->force_drain = 1;
1604: }
1605: if (c == NULL) {
1606: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1607: packet_put_int(remote_id);
1608: } else {
1609: /* Send a confirmation to the remote host. */
1610: debug("Forwarding authentication connection.");
1611: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1612: packet_put_int(remote_id);
1613: packet_put_int(c->self);
1614: }
1615: packet_send();
1616: }
1.15 markus 1617:
1.77 itojun 1618: static Channel *
1.40 markus 1619: client_request_forwarded_tcpip(const char *request_type, int rchan)
1620: {
1.103 deraadt 1621: Channel *c = NULL;
1.40 markus 1622: char *listen_address, *originator_address;
1623: int listen_port, originator_port;
1624:
1625: /* Get rest of the packet */
1626: listen_address = packet_get_string(NULL);
1627: listen_port = packet_get_int();
1628: originator_address = packet_get_string(NULL);
1629: originator_port = packet_get_int();
1.93 markus 1630: packet_check_eom();
1.40 markus 1631:
1.191 djm 1632: debug("client_request_forwarded_tcpip: listen %s port %d, "
1633: "originator %s port %d", listen_address, listen_port,
1634: originator_address, originator_port);
1635:
1636: c = channel_connect_by_listen_address(listen_port,
1637: "forwarded-tcpip", originator_address);
1.40 markus 1638:
1639: xfree(originator_address);
1640: xfree(listen_address);
1641: return c;
1642: }
1643:
1.103 deraadt 1644: static Channel *
1.40 markus 1645: client_request_x11(const char *request_type, int rchan)
1646: {
1647: Channel *c = NULL;
1648: char *originator;
1649: int originator_port;
1.67 markus 1650: int sock;
1.40 markus 1651:
1652: if (!options.forward_x11) {
1653: error("Warning: ssh server tried X11 forwarding.");
1.197 ! djm 1654: error("Warning: this is probably a break-in attempt by a "
! 1655: "malicious server.");
1.40 markus 1656: return NULL;
1657: }
1658: originator = packet_get_string(NULL);
1659: if (datafellows & SSH_BUG_X11FWD) {
1660: debug2("buggy server: x11 request w/o originator_port");
1661: originator_port = 0;
1662: } else {
1663: originator_port = packet_get_int();
1664: }
1.93 markus 1665: packet_check_eom();
1.40 markus 1666: /* XXX check permission */
1.47 markus 1667: debug("client_request_x11: request from %s %d", originator,
1668: originator_port);
1.67 markus 1669: xfree(originator);
1.40 markus 1670: sock = x11_connect_display();
1.67 markus 1671: if (sock < 0)
1672: return NULL;
1673: c = channel_new("x11",
1674: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1675: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1676: c->force_drain = 1;
1.40 markus 1677: return c;
1678: }
1679:
1.103 deraadt 1680: static Channel *
1.40 markus 1681: client_request_agent(const char *request_type, int rchan)
1682: {
1683: Channel *c = NULL;
1.67 markus 1684: int sock;
1.40 markus 1685:
1686: if (!options.forward_agent) {
1687: error("Warning: ssh server tried agent forwarding.");
1.197 ! djm 1688: error("Warning: this is probably a break-in attempt by a "
! 1689: "malicious server.");
1.40 markus 1690: return NULL;
1691: }
1.177 stevesk 1692: sock = ssh_get_authentication_socket();
1.67 markus 1693: if (sock < 0)
1694: return NULL;
1695: c = channel_new("authentication agent connection",
1696: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1697: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1698: "authentication agent connection", 1);
1.82 markus 1699: c->force_drain = 1;
1.40 markus 1700: return c;
1.180 djm 1701: }
1702:
1703: int
1704: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1705: {
1706: Channel *c;
1707: int fd;
1708:
1709: if (tun_mode == SSH_TUNMODE_NO)
1710: return 0;
1711:
1712: if (!compat20) {
1713: error("Tunnel forwarding is not support for protocol 1");
1714: return -1;
1715: }
1716:
1717: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1718:
1719: /* Open local tunnel device */
1720: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1721: error("Tunnel device open failed.");
1722: return -1;
1723: }
1724:
1725: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1726: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1727: c->datagram = 1;
1728:
1729: packet_start(SSH2_MSG_CHANNEL_OPEN);
1730: packet_put_cstring("tun@openssh.com");
1731: packet_put_int(c->self);
1732: packet_put_int(c->local_window_max);
1733: packet_put_int(c->local_maxpacket);
1734: packet_put_int(tun_mode);
1735: packet_put_int(remote_tun);
1736: packet_send();
1737:
1738: return 0;
1.40 markus 1739: }
1740:
1.22 markus 1741: /* XXXX move to generic input handler */
1.77 itojun 1742: static void
1.94 markus 1743: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1744: {
1745: Channel *c = NULL;
1746: char *ctype;
1747: int rchan;
1.102 markus 1748: u_int rmaxpack, rwindow, len;
1.22 markus 1749:
1750: ctype = packet_get_string(&len);
1751: rchan = packet_get_int();
1752: rwindow = packet_get_int();
1753: rmaxpack = packet_get_int();
1754:
1.24 markus 1755: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1756: ctype, rchan, rwindow, rmaxpack);
1757:
1.40 markus 1758: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1759: c = client_request_forwarded_tcpip(ctype, rchan);
1760: } else if (strcmp(ctype, "x11") == 0) {
1761: c = client_request_x11(ctype, rchan);
1762: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1763: c = client_request_agent(ctype, rchan);
1.22 markus 1764: }
1765: /* XXX duplicate : */
1766: if (c != NULL) {
1767: debug("confirm %s", ctype);
1768: c->remote_id = rchan;
1769: c->remote_window = rwindow;
1770: c->remote_maxpacket = rmaxpack;
1.69 markus 1771: if (c->type != SSH_CHANNEL_CONNECTING) {
1772: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1773: packet_put_int(c->remote_id);
1774: packet_put_int(c->self);
1775: packet_put_int(c->local_window);
1776: packet_put_int(c->local_maxpacket);
1777: packet_send();
1778: }
1.22 markus 1779: } else {
1780: debug("failure %s", ctype);
1781: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1782: packet_put_int(rchan);
1783: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1784: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1785: packet_put_cstring("open failed");
1.66 markus 1786: packet_put_cstring("");
1787: }
1.22 markus 1788: packet_send();
1789: }
1790: xfree(ctype);
1791: }
1.77 itojun 1792: static void
1.94 markus 1793: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1794: {
1795: Channel *c = NULL;
1.123 djm 1796: int exitval, id, reply, success = 0;
1.48 markus 1797: char *rtype;
1798:
1799: id = packet_get_int();
1800: rtype = packet_get_string(NULL);
1801: reply = packet_get_char();
1802:
1803: debug("client_input_channel_req: channel %d rtype %s reply %d",
1804: id, rtype, reply);
1805:
1.128 djm 1806: if (id == -1) {
1807: error("client_input_channel_req: request for channel -1");
1808: } else if ((c = channel_lookup(id)) == NULL) {
1.197 ! djm 1809: error("client_input_channel_req: channel %d: "
! 1810: "unknown channel", id);
1.193 markus 1811: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1812: packet_check_eom();
1813: chan_rcvd_eow(c);
1.48 markus 1814: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1815: exitval = packet_get_int();
1816: if (id == session_ident) {
1817: success = 1;
1818: exit_status = exitval;
1819: } else if (c->ctl_fd == -1) {
1820: error("client_input_channel_req: unexpected channel %d",
1821: session_ident);
1822: } else {
1823: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1824: success = 1;
1825: }
1.93 markus 1826: packet_check_eom();
1.48 markus 1827: }
1828: if (reply) {
1829: packet_start(success ?
1830: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1831: packet_put_int(id);
1.48 markus 1832: packet_send();
1833: }
1834: xfree(rtype);
1835: }
1.95 markus 1836: static void
1837: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1838: {
1839: char *rtype;
1840: int want_reply;
1841: int success = 0;
1842:
1843: rtype = packet_get_string(NULL);
1844: want_reply = packet_get_char();
1.117 markus 1845: debug("client_input_global_request: rtype %s want_reply %d",
1846: rtype, want_reply);
1.95 markus 1847: if (want_reply) {
1848: packet_start(success ?
1849: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1850: packet_send();
1851: packet_write_wait();
1852: }
1853: xfree(rtype);
1854: }
1.22 markus 1855:
1.123 djm 1856: void
1.129 deraadt 1857: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 1858: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 1859: {
1860: int len;
1.132 djm 1861: Channel *c = NULL;
1.123 djm 1862:
1863: debug2("%s: id %d", __func__, id);
1864:
1.132 djm 1865: if ((c = channel_lookup(id)) == NULL)
1866: fatal("client_session2_setup: channel %d: unknown channel", id);
1867:
1.123 djm 1868: if (want_tty) {
1869: struct winsize ws;
1870:
1871: /* Store window size in the packet. */
1872: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1873: memset(&ws, 0, sizeof(ws));
1874:
1.190 djm 1875: channel_request_start(id, "pty-req", 1);
1876: client_expect_confirm(id, "PTY allocation", 0);
1.123 djm 1877: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1878: packet_put_int((u_int)ws.ws_col);
1879: packet_put_int((u_int)ws.ws_row);
1880: packet_put_int((u_int)ws.ws_xpixel);
1881: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 1882: if (tiop == NULL)
1883: tiop = get_saved_tio();
1884: tty_make_modes(-1, tiop);
1.123 djm 1885: packet_send();
1886: /* XXX wait for reply */
1.132 djm 1887: c->client_tty = 1;
1.123 djm 1888: }
1889:
1890: /* Transfer any environment variables from client to server */
1.126 djm 1891: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1892: int i, j, matched;
1893: char *name, *val;
1894:
1895: debug("Sending environment.");
1.126 djm 1896: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1897: /* Split */
1.126 djm 1898: name = xstrdup(env[i]);
1.123 djm 1899: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1900: xfree(name);
1.123 djm 1901: continue;
1902: }
1903: *val++ = '\0';
1904:
1905: matched = 0;
1906: for (j = 0; j < options.num_send_env; j++) {
1907: if (match_pattern(name, options.send_env[j])) {
1908: matched = 1;
1909: break;
1910: }
1911: }
1912: if (!matched) {
1913: debug3("Ignored env %s", name);
1.144 stevesk 1914: xfree(name);
1.123 djm 1915: continue;
1916: }
1917:
1918: debug("Sending env %s = %s", name, val);
1919: channel_request_start(id, "env", 0);
1920: packet_put_cstring(name);
1921: packet_put_cstring(val);
1922: packet_send();
1.144 stevesk 1923: xfree(name);
1.123 djm 1924: }
1925: }
1926:
1927: len = buffer_len(cmd);
1928: if (len > 0) {
1929: if (len > 900)
1930: len = 900;
1931: if (want_subsystem) {
1.190 djm 1932: debug("Sending subsystem: %.*s",
1933: len, (u_char*)buffer_ptr(cmd));
1934: channel_request_start(id, "subsystem", 1);
1935: client_expect_confirm(id, "subsystem", 1);
1.123 djm 1936: } else {
1.190 djm 1937: debug("Sending command: %.*s",
1938: len, (u_char*)buffer_ptr(cmd));
1939: channel_request_start(id, "exec", 1);
1940: client_expect_confirm(id, "exec", 1);
1.123 djm 1941: }
1942: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1943: packet_send();
1944: } else {
1.190 djm 1945: channel_request_start(id, "shell", 1);
1946: client_expect_confirm(id, "shell", 1);
1.123 djm 1947: packet_send();
1948: }
1949: }
1950:
1.77 itojun 1951: static void
1.49 itojun 1952: client_init_dispatch_20(void)
1.16 markus 1953: {
1.55 markus 1954: dispatch_init(&dispatch_protocol_error);
1.100 markus 1955:
1.16 markus 1956: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1957: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1958: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1959: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1960: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1961: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1962: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1963: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1964: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 1965: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
1966: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 1967: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1968:
1969: /* rekeying */
1970: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1971:
1972: /* global request reply messages */
1973: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1974: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1975: }
1.197 ! djm 1976:
1.77 itojun 1977: static void
1.49 itojun 1978: client_init_dispatch_13(void)
1.15 markus 1979: {
1980: dispatch_init(NULL);
1981: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1982: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1983: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1984: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1985: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1986: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1987: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1988: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1989: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1990:
1991: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1992: &client_input_agent_open : &deny_input_open);
1.39 markus 1993: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1994: &x11_input_open : &deny_input_open);
1.15 markus 1995: }
1.197 ! djm 1996:
1.77 itojun 1997: static void
1.49 itojun 1998: client_init_dispatch_15(void)
1.15 markus 1999: {
2000: client_init_dispatch_13();
2001: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2002: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2003: }
1.197 ! djm 2004:
1.79 stevesk 2005: static void
1.49 itojun 2006: client_init_dispatch(void)
1.15 markus 2007: {
1.16 markus 2008: if (compat20)
2009: client_init_dispatch_20();
2010: else if (compat13)
1.15 markus 2011: client_init_dispatch_13();
2012: else
2013: client_init_dispatch_15();
1.113 markus 2014: }
2015:
2016: /* client specific fatal cleanup */
2017: void
1.114 markus 2018: cleanup_exit(int i)
1.113 markus 2019: {
2020: leave_raw_mode();
2021: leave_non_blocking();
1.192 djm 2022: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2023: unlink(options.control_path);
1.114 markus 2024: _exit(i);
1.1 deraadt 2025: }