Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.199
1.199 ! djm 1: /* $OpenBSD: clientloop.c,v 1.198 2008/06/12 15:19:17 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 */
1.199 ! djm 740: first_gc = TAILQ_LAST(&global_confirms, global_confirms);
1.196 djm 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:
1.198 djm 1255: /* Free the escape filter context on channel free */
1256: void
1257: client_filter_cleanup(int cid, void *ctx)
1258: {
1259: xfree(ctx);
1260: }
1261:
1.195 djm 1262: int
1263: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1264: {
1.190 djm 1265: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1266: return 0;
1267:
1.195 djm 1268: return process_escapes(c, &c->input, &c->output, &c->extended,
1269: buf, len);
1.30 markus 1270: }
1271:
1.77 itojun 1272: static void
1.60 markus 1273: client_channel_closed(int id, void *arg)
1274: {
1.83 markus 1275: channel_cancel_cleanup(id);
1.60 markus 1276: session_closed = 1;
1.113 markus 1277: leave_raw_mode();
1.60 markus 1278: }
1279:
1.15 markus 1280: /*
1.13 markus 1281: * Implements the interactive session with the server. This is called after
1282: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1283: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1284: * used as an escape character for terminating or suspending the session.
1.13 markus 1285: */
1.1 deraadt 1286:
1.20 markus 1287: int
1.30 markus 1288: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1289: {
1.46 markus 1290: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1291: double start_time, total_time;
1.130 avsm 1292: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1293: u_int nalloc = 0;
1.11 markus 1294: char buf[100];
1295:
1296: debug("Entering interactive session.");
1297:
1298: start_time = get_current_time();
1299:
1300: /* Initialize variables. */
1.195 djm 1301: escape_pending1 = 0;
1.11 markus 1302: last_was_cr = 1;
1303: exit_status = -1;
1304: stdin_eof = 0;
1305: buffer_high = 64 * 1024;
1306: connection_in = packet_get_connection_in();
1307: connection_out = packet_get_connection_out();
1.46 markus 1308: max_fd = MAX(connection_in, connection_out);
1.192 djm 1309: if (muxserver_sock != -1)
1310: max_fd = MAX(max_fd, muxserver_sock);
1.46 markus 1311:
1312: if (!compat20) {
1.63 markus 1313: /* enable nonblocking unless tty */
1314: if (!isatty(fileno(stdin)))
1315: set_nonblock(fileno(stdin));
1316: if (!isatty(fileno(stdout)))
1317: set_nonblock(fileno(stdout));
1318: if (!isatty(fileno(stderr)))
1319: set_nonblock(fileno(stderr));
1.46 markus 1320: max_fd = MAX(max_fd, fileno(stdin));
1321: max_fd = MAX(max_fd, fileno(stdout));
1322: max_fd = MAX(max_fd, fileno(stderr));
1323: }
1.11 markus 1324: stdin_bytes = 0;
1325: stdout_bytes = 0;
1326: stderr_bytes = 0;
1327: quit_pending = 0;
1.195 djm 1328: escape_char1 = escape_char_arg;
1.11 markus 1329:
1330: /* Initialize buffers. */
1331: buffer_init(&stdin_buffer);
1332: buffer_init(&stdout_buffer);
1333: buffer_init(&stderr_buffer);
1334:
1.15 markus 1335: client_init_dispatch();
1336:
1.105 markus 1337: /*
1338: * Set signal handlers, (e.g. to restore non-blocking mode)
1339: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1340: */
1.131 djm 1341: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1342: signal(SIGHUP, signal_handler);
1.105 markus 1343: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1344: signal(SIGINT, signal_handler);
1345: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1346: signal(SIGQUIT, signal_handler);
1347: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1348: signal(SIGTERM, signal_handler);
1.132 djm 1349: signal(SIGWINCH, window_change_handler);
1.11 markus 1350:
1351: if (have_pty)
1352: enter_raw_mode();
1353:
1.48 markus 1354: if (compat20) {
1355: session_ident = ssh2_chan_id;
1.195 djm 1356: if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1.48 markus 1357: channel_register_filter(session_ident,
1.195 djm 1358: client_simple_escape_filter, NULL,
1.198 djm 1359: client_filter_cleanup,
1.195 djm 1360: client_new_escape_filter_ctx(escape_char_arg));
1.60 markus 1361: if (session_ident != -1)
1362: channel_register_cleanup(session_ident,
1.143 djm 1363: client_channel_closed, 0);
1.48 markus 1364: } else {
1365: /* Check if we should immediately send eof on stdin. */
1.16 markus 1366: client_check_initial_eof_on_stdin();
1.48 markus 1367: }
1.30 markus 1368:
1.11 markus 1369: /* Main loop of the client for the interactive session mode. */
1370: while (!quit_pending) {
1371:
1.13 markus 1372: /* Process buffered packets sent by the server. */
1.11 markus 1373: client_process_buffered_input_packets();
1374:
1.60 markus 1375: if (compat20 && session_closed && !channel_still_open())
1376: break;
1377:
1.56 markus 1378: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1379:
1.56 markus 1380: if (rekeying) {
1381: debug("rekeying in progress");
1382: } else {
1383: /*
1384: * Make packets of buffered stdin data, and buffer
1385: * them for sending to the server.
1386: */
1387: if (!compat20)
1388: client_make_packets_from_stdin_data();
1.11 markus 1389:
1.56 markus 1390: /*
1391: * Make packets from buffered channel data, and
1392: * enqueue them for sending to the server.
1393: */
1394: if (packet_not_very_much_data_to_write())
1395: channel_output_poll();
1.11 markus 1396:
1.56 markus 1397: /*
1398: * Check if the window size has changed, and buffer a
1399: * message about it to the server if so.
1400: */
1401: client_check_window_change();
1.11 markus 1402:
1.56 markus 1403: if (quit_pending)
1404: break;
1405: }
1.13 markus 1406: /*
1407: * Wait until we have something to do (something becomes
1408: * available on one of the descriptors).
1409: */
1.81 markus 1410: max_fd2 = max_fd;
1.56 markus 1411: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1412: &max_fd2, &nalloc, rekeying);
1.11 markus 1413:
1414: if (quit_pending)
1415: break;
1416:
1.56 markus 1417: /* Do channel operations unless rekeying in progress. */
1418: if (!rekeying) {
1419: channel_after_select(readset, writeset);
1.108 markus 1420: if (need_rekeying || packet_need_rekeying()) {
1421: debug("need rekeying");
1.56 markus 1422: xxx_kex->done = 0;
1423: kex_send_kexinit(xxx_kex);
1424: need_rekeying = 0;
1425: }
1426: }
1.11 markus 1427:
1.17 markus 1428: /* Buffer input from the connection. */
1.46 markus 1429: client_process_net_input(readset);
1.17 markus 1430:
1.123 djm 1431: /* Accept control connections. */
1.192 djm 1432: if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1433: if (muxserver_accept_control())
1434: quit_pending = 1;
1435: }
1.123 djm 1436:
1.17 markus 1437: if (quit_pending)
1438: break;
1.11 markus 1439:
1.17 markus 1440: if (!compat20) {
1441: /* Buffer data from stdin */
1.46 markus 1442: client_process_input(readset);
1.17 markus 1443: /*
1444: * Process output to stdout and stderr. Output to
1445: * the connection is processed elsewhere (above).
1446: */
1.46 markus 1447: client_process_output(writeset);
1.17 markus 1448: }
1.11 markus 1449:
1.197 djm 1450: /*
1451: * Send as much buffered packet data as possible to the
1452: * sender.
1453: */
1.46 markus 1454: if (FD_ISSET(connection_out, writeset))
1.11 markus 1455: packet_write_poll();
1456: }
1.46 markus 1457: if (readset)
1458: xfree(readset);
1459: if (writeset)
1460: xfree(writeset);
1.11 markus 1461:
1462: /* Terminate the session. */
1463:
1464: /* Stop watching for window change. */
1.132 djm 1465: signal(SIGWINCH, SIG_DFL);
1.11 markus 1466:
1.76 markus 1467: channel_free_all();
1.11 markus 1468:
1.75 markus 1469: if (have_pty)
1470: leave_raw_mode();
1471:
1472: /* restore blocking io */
1473: if (!isatty(fileno(stdin)))
1474: unset_nonblock(fileno(stdin));
1475: if (!isatty(fileno(stdout)))
1476: unset_nonblock(fileno(stdout));
1477: if (!isatty(fileno(stderr)))
1478: unset_nonblock(fileno(stderr));
1.116 dtucker 1479:
1480: /*
1481: * If there was no shell or command requested, there will be no remote
1482: * exit status to be returned. In that case, clear error code if the
1483: * connection was deliberately terminated at this end.
1484: */
1485: if (no_shell_flag && received_signal == SIGTERM) {
1486: received_signal = 0;
1487: exit_status = 0;
1488: }
1.75 markus 1489:
1.113 markus 1490: if (received_signal)
1.89 itojun 1491: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1492:
1.13 markus 1493: /*
1494: * In interactive mode (with pseudo tty) display a message indicating
1495: * that the connection has been closed.
1496: */
1.11 markus 1497: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1498: snprintf(buf, sizeof buf,
1499: "Connection to %.64s closed.\r\n", host);
1.11 markus 1500: buffer_append(&stderr_buffer, buf, strlen(buf));
1501: }
1.70 markus 1502:
1.11 markus 1503: /* Output any buffered data for stdout. */
1.70 markus 1504: while (buffer_len(&stdout_buffer) > 0) {
1505: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1506: buffer_len(&stdout_buffer));
1.70 markus 1507: if (len <= 0) {
1.11 markus 1508: error("Write failed flushing stdout buffer.");
1.70 markus 1509: break;
1510: }
1.11 markus 1511: buffer_consume(&stdout_buffer, len);
1.57 markus 1512: stdout_bytes += len;
1.11 markus 1513: }
1514:
1515: /* Output any buffered data for stderr. */
1.70 markus 1516: while (buffer_len(&stderr_buffer) > 0) {
1517: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1518: buffer_len(&stderr_buffer));
1.70 markus 1519: if (len <= 0) {
1.11 markus 1520: error("Write failed flushing stderr buffer.");
1.70 markus 1521: break;
1522: }
1.11 markus 1523: buffer_consume(&stderr_buffer, len);
1.57 markus 1524: stderr_bytes += len;
1.11 markus 1525: }
1526:
1527: /* Clear and free any buffers. */
1528: memset(buf, 0, sizeof(buf));
1529: buffer_free(&stdin_buffer);
1530: buffer_free(&stdout_buffer);
1531: buffer_free(&stderr_buffer);
1532:
1533: /* Report bytes transferred, and transfer rates. */
1534: total_time = get_current_time() - start_time;
1.197 djm 1535: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f "
1536: "seconds", stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1537: if (total_time > 0)
1538: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1539: stdin_bytes / total_time, stdout_bytes / total_time,
1540: stderr_bytes / total_time);
1.11 markus 1541:
1542: /* Return the exit status of the program. */
1543: debug("Exit status %d", exit_status);
1544: return exit_status;
1.15 markus 1545: }
1546:
1547: /*********/
1548:
1.77 itojun 1549: static void
1.94 markus 1550: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1551: {
1.42 markus 1552: u_int data_len;
1.15 markus 1553: char *data = packet_get_string(&data_len);
1.93 markus 1554: packet_check_eom();
1.15 markus 1555: buffer_append(&stdout_buffer, data, data_len);
1556: memset(data, 0, data_len);
1557: xfree(data);
1558: }
1.77 itojun 1559: static void
1.94 markus 1560: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1561: {
1.42 markus 1562: u_int data_len;
1.15 markus 1563: char *data = packet_get_string(&data_len);
1.93 markus 1564: packet_check_eom();
1.15 markus 1565: buffer_append(&stderr_buffer, data, data_len);
1566: memset(data, 0, data_len);
1567: xfree(data);
1568: }
1.77 itojun 1569: static void
1.94 markus 1570: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1571: {
1572: exit_status = packet_get_int();
1.93 markus 1573: packet_check_eom();
1.15 markus 1574: /* Acknowledge the exit. */
1575: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1576: packet_send();
1577: /*
1578: * Must wait for packet to be sent since we are
1579: * exiting the loop.
1580: */
1581: packet_write_wait();
1582: /* Flag that we want to exit. */
1583: quit_pending = 1;
1584: }
1.115 markus 1585: static void
1586: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1587: {
1588: Channel *c = NULL;
1589: int remote_id, sock;
1590:
1591: /* Read the remote channel number from the message. */
1592: remote_id = packet_get_int();
1593: packet_check_eom();
1594:
1595: /*
1596: * Get a connection to the local authentication agent (this may again
1597: * get forwarded).
1598: */
1599: sock = ssh_get_authentication_socket();
1600:
1601: /*
1602: * If we could not connect the agent, send an error message back to
1603: * the server. This should never happen unless the agent dies,
1604: * because authentication forwarding is only enabled if we have an
1605: * agent.
1606: */
1607: if (sock >= 0) {
1608: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1609: -1, 0, 0, 0, "authentication agent connection", 1);
1610: c->remote_id = remote_id;
1611: c->force_drain = 1;
1612: }
1613: if (c == NULL) {
1614: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1615: packet_put_int(remote_id);
1616: } else {
1617: /* Send a confirmation to the remote host. */
1618: debug("Forwarding authentication connection.");
1619: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1620: packet_put_int(remote_id);
1621: packet_put_int(c->self);
1622: }
1623: packet_send();
1624: }
1.15 markus 1625:
1.77 itojun 1626: static Channel *
1.40 markus 1627: client_request_forwarded_tcpip(const char *request_type, int rchan)
1628: {
1.103 deraadt 1629: Channel *c = NULL;
1.40 markus 1630: char *listen_address, *originator_address;
1631: int listen_port, originator_port;
1632:
1633: /* Get rest of the packet */
1634: listen_address = packet_get_string(NULL);
1635: listen_port = packet_get_int();
1636: originator_address = packet_get_string(NULL);
1637: originator_port = packet_get_int();
1.93 markus 1638: packet_check_eom();
1.40 markus 1639:
1.191 djm 1640: debug("client_request_forwarded_tcpip: listen %s port %d, "
1641: "originator %s port %d", listen_address, listen_port,
1642: originator_address, originator_port);
1643:
1644: c = channel_connect_by_listen_address(listen_port,
1645: "forwarded-tcpip", originator_address);
1.40 markus 1646:
1647: xfree(originator_address);
1648: xfree(listen_address);
1649: return c;
1650: }
1651:
1.103 deraadt 1652: static Channel *
1.40 markus 1653: client_request_x11(const char *request_type, int rchan)
1654: {
1655: Channel *c = NULL;
1656: char *originator;
1657: int originator_port;
1.67 markus 1658: int sock;
1.40 markus 1659:
1660: if (!options.forward_x11) {
1661: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1662: error("Warning: this is probably a break-in attempt by a "
1663: "malicious server.");
1.40 markus 1664: return NULL;
1665: }
1666: originator = packet_get_string(NULL);
1667: if (datafellows & SSH_BUG_X11FWD) {
1668: debug2("buggy server: x11 request w/o originator_port");
1669: originator_port = 0;
1670: } else {
1671: originator_port = packet_get_int();
1672: }
1.93 markus 1673: packet_check_eom();
1.40 markus 1674: /* XXX check permission */
1.47 markus 1675: debug("client_request_x11: request from %s %d", originator,
1676: originator_port);
1.67 markus 1677: xfree(originator);
1.40 markus 1678: sock = x11_connect_display();
1.67 markus 1679: if (sock < 0)
1680: return NULL;
1681: c = channel_new("x11",
1682: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1683: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1684: c->force_drain = 1;
1.40 markus 1685: return c;
1686: }
1687:
1.103 deraadt 1688: static Channel *
1.40 markus 1689: client_request_agent(const char *request_type, int rchan)
1690: {
1691: Channel *c = NULL;
1.67 markus 1692: int sock;
1.40 markus 1693:
1694: if (!options.forward_agent) {
1695: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1696: error("Warning: this is probably a break-in attempt by a "
1697: "malicious server.");
1.40 markus 1698: return NULL;
1699: }
1.177 stevesk 1700: sock = ssh_get_authentication_socket();
1.67 markus 1701: if (sock < 0)
1702: return NULL;
1703: c = channel_new("authentication agent connection",
1704: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1705: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1706: "authentication agent connection", 1);
1.82 markus 1707: c->force_drain = 1;
1.40 markus 1708: return c;
1.180 djm 1709: }
1710:
1711: int
1712: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1713: {
1714: Channel *c;
1715: int fd;
1716:
1717: if (tun_mode == SSH_TUNMODE_NO)
1718: return 0;
1719:
1720: if (!compat20) {
1721: error("Tunnel forwarding is not support for protocol 1");
1722: return -1;
1723: }
1724:
1725: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1726:
1727: /* Open local tunnel device */
1728: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1729: error("Tunnel device open failed.");
1730: return -1;
1731: }
1732:
1733: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1734: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1735: c->datagram = 1;
1736:
1737: packet_start(SSH2_MSG_CHANNEL_OPEN);
1738: packet_put_cstring("tun@openssh.com");
1739: packet_put_int(c->self);
1740: packet_put_int(c->local_window_max);
1741: packet_put_int(c->local_maxpacket);
1742: packet_put_int(tun_mode);
1743: packet_put_int(remote_tun);
1744: packet_send();
1745:
1746: return 0;
1.40 markus 1747: }
1748:
1.22 markus 1749: /* XXXX move to generic input handler */
1.77 itojun 1750: static void
1.94 markus 1751: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1752: {
1753: Channel *c = NULL;
1754: char *ctype;
1755: int rchan;
1.102 markus 1756: u_int rmaxpack, rwindow, len;
1.22 markus 1757:
1758: ctype = packet_get_string(&len);
1759: rchan = packet_get_int();
1760: rwindow = packet_get_int();
1761: rmaxpack = packet_get_int();
1762:
1.24 markus 1763: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1764: ctype, rchan, rwindow, rmaxpack);
1765:
1.40 markus 1766: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1767: c = client_request_forwarded_tcpip(ctype, rchan);
1768: } else if (strcmp(ctype, "x11") == 0) {
1769: c = client_request_x11(ctype, rchan);
1770: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1771: c = client_request_agent(ctype, rchan);
1.22 markus 1772: }
1773: /* XXX duplicate : */
1774: if (c != NULL) {
1775: debug("confirm %s", ctype);
1776: c->remote_id = rchan;
1777: c->remote_window = rwindow;
1778: c->remote_maxpacket = rmaxpack;
1.69 markus 1779: if (c->type != SSH_CHANNEL_CONNECTING) {
1780: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1781: packet_put_int(c->remote_id);
1782: packet_put_int(c->self);
1783: packet_put_int(c->local_window);
1784: packet_put_int(c->local_maxpacket);
1785: packet_send();
1786: }
1.22 markus 1787: } else {
1788: debug("failure %s", ctype);
1789: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1790: packet_put_int(rchan);
1791: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1792: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1793: packet_put_cstring("open failed");
1.66 markus 1794: packet_put_cstring("");
1795: }
1.22 markus 1796: packet_send();
1797: }
1798: xfree(ctype);
1799: }
1.77 itojun 1800: static void
1.94 markus 1801: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1802: {
1803: Channel *c = NULL;
1.123 djm 1804: int exitval, id, reply, success = 0;
1.48 markus 1805: char *rtype;
1806:
1807: id = packet_get_int();
1808: rtype = packet_get_string(NULL);
1809: reply = packet_get_char();
1810:
1811: debug("client_input_channel_req: channel %d rtype %s reply %d",
1812: id, rtype, reply);
1813:
1.128 djm 1814: if (id == -1) {
1815: error("client_input_channel_req: request for channel -1");
1816: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 1817: error("client_input_channel_req: channel %d: "
1818: "unknown channel", id);
1.193 markus 1819: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1820: packet_check_eom();
1821: chan_rcvd_eow(c);
1.48 markus 1822: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1823: exitval = packet_get_int();
1824: if (id == session_ident) {
1825: success = 1;
1826: exit_status = exitval;
1827: } else if (c->ctl_fd == -1) {
1828: error("client_input_channel_req: unexpected channel %d",
1829: session_ident);
1830: } else {
1831: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1832: success = 1;
1833: }
1.93 markus 1834: packet_check_eom();
1.48 markus 1835: }
1836: if (reply) {
1837: packet_start(success ?
1838: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1839: packet_put_int(id);
1.48 markus 1840: packet_send();
1841: }
1842: xfree(rtype);
1843: }
1.95 markus 1844: static void
1845: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1846: {
1847: char *rtype;
1848: int want_reply;
1849: int success = 0;
1850:
1851: rtype = packet_get_string(NULL);
1852: want_reply = packet_get_char();
1.117 markus 1853: debug("client_input_global_request: rtype %s want_reply %d",
1854: rtype, want_reply);
1.95 markus 1855: if (want_reply) {
1856: packet_start(success ?
1857: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1858: packet_send();
1859: packet_write_wait();
1860: }
1861: xfree(rtype);
1862: }
1.22 markus 1863:
1.123 djm 1864: void
1.129 deraadt 1865: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 1866: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 1867: {
1868: int len;
1.132 djm 1869: Channel *c = NULL;
1.123 djm 1870:
1871: debug2("%s: id %d", __func__, id);
1872:
1.132 djm 1873: if ((c = channel_lookup(id)) == NULL)
1874: fatal("client_session2_setup: channel %d: unknown channel", id);
1875:
1.123 djm 1876: if (want_tty) {
1877: struct winsize ws;
1878:
1879: /* Store window size in the packet. */
1880: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1881: memset(&ws, 0, sizeof(ws));
1882:
1.190 djm 1883: channel_request_start(id, "pty-req", 1);
1884: client_expect_confirm(id, "PTY allocation", 0);
1.123 djm 1885: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1886: packet_put_int((u_int)ws.ws_col);
1887: packet_put_int((u_int)ws.ws_row);
1888: packet_put_int((u_int)ws.ws_xpixel);
1889: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 1890: if (tiop == NULL)
1891: tiop = get_saved_tio();
1892: tty_make_modes(-1, tiop);
1.123 djm 1893: packet_send();
1894: /* XXX wait for reply */
1.132 djm 1895: c->client_tty = 1;
1.123 djm 1896: }
1897:
1898: /* Transfer any environment variables from client to server */
1.126 djm 1899: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1900: int i, j, matched;
1901: char *name, *val;
1902:
1903: debug("Sending environment.");
1.126 djm 1904: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1905: /* Split */
1.126 djm 1906: name = xstrdup(env[i]);
1.123 djm 1907: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1908: xfree(name);
1.123 djm 1909: continue;
1910: }
1911: *val++ = '\0';
1912:
1913: matched = 0;
1914: for (j = 0; j < options.num_send_env; j++) {
1915: if (match_pattern(name, options.send_env[j])) {
1916: matched = 1;
1917: break;
1918: }
1919: }
1920: if (!matched) {
1921: debug3("Ignored env %s", name);
1.144 stevesk 1922: xfree(name);
1.123 djm 1923: continue;
1924: }
1925:
1926: debug("Sending env %s = %s", name, val);
1927: channel_request_start(id, "env", 0);
1928: packet_put_cstring(name);
1929: packet_put_cstring(val);
1930: packet_send();
1.144 stevesk 1931: xfree(name);
1.123 djm 1932: }
1933: }
1934:
1935: len = buffer_len(cmd);
1936: if (len > 0) {
1937: if (len > 900)
1938: len = 900;
1939: if (want_subsystem) {
1.190 djm 1940: debug("Sending subsystem: %.*s",
1941: len, (u_char*)buffer_ptr(cmd));
1942: channel_request_start(id, "subsystem", 1);
1943: client_expect_confirm(id, "subsystem", 1);
1.123 djm 1944: } else {
1.190 djm 1945: debug("Sending command: %.*s",
1946: len, (u_char*)buffer_ptr(cmd));
1947: channel_request_start(id, "exec", 1);
1948: client_expect_confirm(id, "exec", 1);
1.123 djm 1949: }
1950: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1951: packet_send();
1952: } else {
1.190 djm 1953: channel_request_start(id, "shell", 1);
1954: client_expect_confirm(id, "shell", 1);
1.123 djm 1955: packet_send();
1956: }
1957: }
1958:
1.77 itojun 1959: static void
1.49 itojun 1960: client_init_dispatch_20(void)
1.16 markus 1961: {
1.55 markus 1962: dispatch_init(&dispatch_protocol_error);
1.100 markus 1963:
1.16 markus 1964: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1965: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1966: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1967: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1968: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1969: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1970: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1971: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1972: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 1973: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
1974: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 1975: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1976:
1977: /* rekeying */
1978: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1979:
1980: /* global request reply messages */
1981: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1982: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1983: }
1.197 djm 1984:
1.77 itojun 1985: static void
1.49 itojun 1986: client_init_dispatch_13(void)
1.15 markus 1987: {
1988: dispatch_init(NULL);
1989: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1990: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1991: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1992: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1993: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1994: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1995: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1996: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1997: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1998:
1999: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2000: &client_input_agent_open : &deny_input_open);
1.39 markus 2001: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2002: &x11_input_open : &deny_input_open);
1.15 markus 2003: }
1.197 djm 2004:
1.77 itojun 2005: static void
1.49 itojun 2006: client_init_dispatch_15(void)
1.15 markus 2007: {
2008: client_init_dispatch_13();
2009: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2010: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2011: }
1.197 djm 2012:
1.79 stevesk 2013: static void
1.49 itojun 2014: client_init_dispatch(void)
1.15 markus 2015: {
1.16 markus 2016: if (compat20)
2017: client_init_dispatch_20();
2018: else if (compat13)
1.15 markus 2019: client_init_dispatch_13();
2020: else
2021: client_init_dispatch_15();
1.113 markus 2022: }
2023:
2024: /* client specific fatal cleanup */
2025: void
1.114 markus 2026: cleanup_exit(int i)
1.113 markus 2027: {
2028: leave_raw_mode();
2029: leave_non_blocking();
1.192 djm 2030: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2031: unlink(options.control_path);
1.114 markus 2032: _exit(i);
1.1 deraadt 2033: }
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