Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.196
1.196 ! djm 1: /* $OpenBSD: clientloop.c,v 1.195 2008/06/12 03:40:52 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. */
142: static int exit_status; /* Used to store the exit status of the command. */
143: static int stdin_eof; /* EOF has been encountered on standard error. */
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) {
1.13 markus 387: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 388: debug("Sending eof.");
389: stdin_eof = 1;
390: packet_start(SSH_CMSG_EOF);
391: packet_send();
392: } else if (len > 0) {
1.13 markus 393: /*
394: * Got data. We must store the data in the buffer,
395: * and also process it as an escape character if
396: * appropriate.
397: */
1.195 djm 398: if ((u_char) buf[0] == escape_char1)
399: escape_pending1 = 1;
1.52 markus 400: else
1.11 markus 401: buffer_append(&stdin_buffer, buf, 1);
402: }
403: leave_non_blocking();
404: }
1.1 deraadt 405: }
406:
407:
1.13 markus 408: /*
409: * Make packets from buffered stdin data, and buffer them for sending to the
410: * connection.
411: */
1.1 deraadt 412:
1.77 itojun 413: static void
1.49 itojun 414: client_make_packets_from_stdin_data(void)
1.1 deraadt 415: {
1.42 markus 416: u_int len;
1.1 deraadt 417:
1.11 markus 418: /* Send buffered stdin data to the server. */
419: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 420: packet_not_very_much_data_to_write()) {
1.11 markus 421: len = buffer_len(&stdin_buffer);
422: /* Keep the packets at reasonable size. */
423: if (len > packet_get_maxsize())
424: len = packet_get_maxsize();
425: packet_start(SSH_CMSG_STDIN_DATA);
426: packet_put_string(buffer_ptr(&stdin_buffer), len);
427: packet_send();
428: buffer_consume(&stdin_buffer, len);
1.52 markus 429: stdin_bytes += len;
1.11 markus 430: /* If we have a pending EOF, send it now. */
431: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
432: packet_start(SSH_CMSG_EOF);
433: packet_send();
434: }
1.1 deraadt 435: }
436: }
437:
1.13 markus 438: /*
439: * Checks if the client window has changed, and sends a packet about it to
440: * the server if so. The actual change is detected elsewhere (by a software
441: * interrupt on Unix); this just checks the flag and sends a message if
442: * appropriate.
443: */
1.1 deraadt 444:
1.77 itojun 445: static void
1.49 itojun 446: client_check_window_change(void)
1.1 deraadt 447: {
1.16 markus 448: struct winsize ws;
449:
450: if (! received_window_change_signal)
451: return;
452: /** XXX race */
453: received_window_change_signal = 0;
454:
1.37 markus 455: debug2("client_check_window_change: changed");
1.16 markus 456:
457: if (compat20) {
1.123 djm 458: channel_send_window_changes();
1.16 markus 459: } else {
1.123 djm 460: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
461: return;
1.16 markus 462: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 463: packet_put_int((u_int)ws.ws_row);
464: packet_put_int((u_int)ws.ws_col);
465: packet_put_int((u_int)ws.ws_xpixel);
466: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 467: packet_send();
1.1 deraadt 468: }
469: }
470:
1.117 markus 471: static void
472: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
473: {
1.196 ! djm 474: struct global_confirm *gc;
! 475:
! 476: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
! 477: return;
! 478: if (gc->cb != NULL)
! 479: gc->cb(type, seq, gc->ctx);
! 480: if (--gc->ref_count <= 0) {
! 481: TAILQ_REMOVE(&global_confirms, gc, entry);
! 482: bzero(gc, sizeof(*gc));
! 483: xfree(gc);
! 484: }
! 485:
1.188 dtucker 486: keep_alive_timeouts = 0;
1.117 markus 487: }
488:
489: static void
490: server_alive_check(void)
491: {
1.188 dtucker 492: if (++keep_alive_timeouts > options.server_alive_count_max) {
1.176 markus 493: logit("Timeout, server not responding.");
494: cleanup_exit(255);
495: }
1.117 markus 496: packet_start(SSH2_MSG_GLOBAL_REQUEST);
497: packet_put_cstring("keepalive@openssh.com");
498: packet_put_char(1); /* boolean: want reply */
499: packet_send();
1.196 ! djm 500: /* Insert an empty placeholder to maintain ordering */
! 501: client_register_global_confirm(NULL, NULL);
1.117 markus 502: }
503:
1.13 markus 504: /*
505: * Waits until the client can do something (some data becomes available on
506: * one of the file descriptors).
507: */
1.77 itojun 508: static void
1.46 markus 509: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 510: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 511: {
1.117 markus 512: struct timeval tv, *tvp;
513: int ret;
514:
1.46 markus 515: /* Add any selections by the channel mechanism. */
1.81 markus 516: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 517:
1.16 markus 518: if (!compat20) {
1.17 markus 519: /* Read from the connection, unless our buffers are full. */
1.16 markus 520: if (buffer_len(&stdout_buffer) < buffer_high &&
521: buffer_len(&stderr_buffer) < buffer_high &&
522: channel_not_very_much_buffered_data())
1.46 markus 523: FD_SET(connection_in, *readsetp);
1.17 markus 524: /*
525: * Read from stdin, unless we have seen EOF or have very much
526: * buffered data to send to the server.
527: */
528: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 529: FD_SET(fileno(stdin), *readsetp);
1.17 markus 530:
531: /* Select stdout/stderr if have data in buffer. */
532: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 533: FD_SET(fileno(stdout), *writesetp);
1.17 markus 534: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 535: FD_SET(fileno(stderr), *writesetp);
1.16 markus 536: } else {
1.71 markus 537: /* channel_prepare_select could have closed the last channel */
1.84 markus 538: if (session_closed && !channel_still_open() &&
539: !packet_have_data_to_write()) {
540: /* clear mask since we did not call select() */
1.87 markus 541: memset(*readsetp, 0, *nallocp);
542: memset(*writesetp, 0, *nallocp);
1.84 markus 543: return;
1.71 markus 544: } else {
545: FD_SET(connection_in, *readsetp);
546: }
1.16 markus 547: }
1.11 markus 548:
549: /* Select server connection if have data to write to the server. */
550: if (packet_have_data_to_write())
1.46 markus 551: FD_SET(connection_out, *writesetp);
1.11 markus 552:
1.192 djm 553: if (muxserver_sock != -1)
554: FD_SET(muxserver_sock, *readsetp);
1.123 djm 555:
1.13 markus 556: /*
557: * Wait for something to happen. This will suspend the process until
558: * some selected descriptor can be read, written, or has some other
1.117 markus 559: * event pending.
1.13 markus 560: */
1.11 markus 561:
1.117 markus 562: if (options.server_alive_interval == 0 || !compat20)
563: tvp = NULL;
1.129 deraadt 564: else {
1.117 markus 565: tv.tv_sec = options.server_alive_interval;
566: tv.tv_usec = 0;
567: tvp = &tv;
568: }
569: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
570: if (ret < 0) {
1.11 markus 571: char buf[100];
1.51 markus 572:
573: /*
574: * We have to clear the select masks, because we return.
575: * We have to return, because the mainloop checks for the flags
576: * set by the signal handlers.
577: */
1.87 markus 578: memset(*readsetp, 0, *nallocp);
579: memset(*writesetp, 0, *nallocp);
1.50 deraadt 580:
1.11 markus 581: if (errno == EINTR)
582: return;
583: /* Note: we might still have data in the buffers. */
584: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
585: buffer_append(&stderr_buffer, buf, strlen(buf));
586: quit_pending = 1;
1.117 markus 587: } else if (ret == 0)
588: server_alive_check();
1.11 markus 589: }
590:
1.77 itojun 591: static void
1.31 markus 592: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 593: {
1.11 markus 594: /* Flush stdout and stderr buffers. */
1.31 markus 595: if (buffer_len(bout) > 0)
1.112 deraadt 596: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 597: if (buffer_len(berr) > 0)
1.112 deraadt 598: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 599:
600: leave_raw_mode();
601:
1.13 markus 602: /*
603: * Free (and clear) the buffer to reduce the amount of data that gets
604: * written to swap.
605: */
1.31 markus 606: buffer_free(bin);
607: buffer_free(bout);
608: buffer_free(berr);
1.11 markus 609:
610: /* Send the suspend signal to the program itself. */
611: kill(getpid(), SIGTSTP);
612:
1.132 djm 613: /* Reset window sizes in case they have changed */
614: received_window_change_signal = 1;
1.11 markus 615:
616: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 617: buffer_init(bin);
618: buffer_init(bout);
619: buffer_init(berr);
1.11 markus 620:
621: enter_raw_mode();
622: }
623:
1.77 itojun 624: static void
1.161 deraadt 625: client_process_net_input(fd_set *readset)
1.11 markus 626: {
1.17 markus 627: int len;
628: char buf[8192];
1.11 markus 629:
1.13 markus 630: /*
631: * Read input from the server, and add any such data to the buffer of
632: * the packet subsystem.
633: */
1.11 markus 634: if (FD_ISSET(connection_in, readset)) {
635: /* Read as much as possible. */
636: len = read(connection_in, buf, sizeof(buf));
637: if (len == 0) {
638: /* Received EOF. The remote host has closed the connection. */
639: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
640: host);
1.1 deraadt 641: buffer_append(&stderr_buffer, buf, strlen(buf));
642: quit_pending = 1;
643: return;
1.11 markus 644: }
1.13 markus 645: /*
646: * There is a kernel bug on Solaris that causes select to
647: * sometimes wake up even though there is no data available.
648: */
1.53 millert 649: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 650: len = 0;
651:
652: if (len < 0) {
653: /* An error has encountered. Perhaps there is a network problem. */
654: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
655: host, strerror(errno));
656: buffer_append(&stderr_buffer, buf, strlen(buf));
657: quit_pending = 1;
658: return;
659: }
660: packet_process_incoming(buf, len);
661: }
1.17 markus 662: }
1.16 markus 663:
1.97 jakob 664: static void
1.190 djm 665: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 666: {
1.190 djm 667: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
668: char errmsg[256];
669: int tochan;
670:
671: /* XXX supress on mux _client_ quietmode */
672: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
673: c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
674:
675: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
676: debug2("%s request accepted on channel %d",
677: cr->request_type, c->self);
678: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
679: if (tochan) {
680: snprintf(errmsg, sizeof(errmsg),
681: "%s request failed\r\n", cr->request_type);
682: } else {
683: snprintf(errmsg, sizeof(errmsg),
684: "%s request failed on channel %d",
685: cr->request_type, c->self);
686: }
687: /* If error occurred on primary session channel, then exit */
688: if (cr->do_close && c->self == session_ident)
689: fatal("%s", errmsg);
690: /* If error occurred on mux client, append to their stderr */
691: if (tochan)
692: buffer_append(&c->extended, errmsg, strlen(errmsg));
693: else
694: error("%s", errmsg);
695: if (cr->do_close) {
696: chan_read_failed(c);
697: chan_write_failed(c);
698: }
699: }
700: xfree(cr);
701: }
702:
703: static void
704: client_abandon_status_confirm(Channel *c, void *ctx)
705: {
706: xfree(ctx);
707: }
1.129 deraadt 708:
1.190 djm 709: static void
710: client_expect_confirm(int id, const char *request, int do_close)
711: {
712: struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
1.123 djm 713:
1.190 djm 714: cr->request_type = request;
715: cr->do_close = do_close;
1.123 djm 716:
1.190 djm 717: channel_register_status_confirm(id, client_status_confirm,
718: client_abandon_status_confirm, cr);
1.196 ! djm 719: }
! 720:
! 721: void
! 722: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
! 723: {
! 724: struct global_confirm *gc, *first_gc;
! 725:
! 726: /* Coalesce identical callbacks */
! 727: first_gc = TAILQ_FIRST(&global_confirms);
! 728: if (first_gc && first_gc->cb == cb && first_gc->ctx == ctx) {
! 729: if (++first_gc->ref_count >= INT_MAX)
! 730: fatal("%s: first_gc->ref_count = %d",
! 731: __func__, first_gc->ref_count);
! 732: return;
! 733: }
! 734:
! 735: gc = xmalloc(sizeof(*gc));
! 736: gc->cb = cb;
! 737: gc->ctx = ctx;
! 738: gc->ref_count = 1;
! 739: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 740: }
741:
742: static void
1.99 markus 743: process_cmdline(void)
1.97 jakob 744: {
745: void (*handler)(int);
1.135 djm 746: char *s, *cmd, *cancel_host;
1.121 djm 747: int delete = 0;
1.97 jakob 748: int local = 0;
1.135 djm 749: u_short cancel_port;
750: Forward fwd;
1.97 jakob 751:
1.183 djm 752: bzero(&fwd, sizeof(fwd));
753: fwd.listen_host = fwd.connect_host = NULL;
754:
1.97 jakob 755: leave_raw_mode();
1.101 markus 756: handler = signal(SIGINT, SIG_IGN);
1.99 markus 757: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 758: if (s == NULL)
759: goto out;
1.179 tedu 760: while (isspace(*s))
1.97 jakob 761: s++;
1.121 djm 762: if (*s == '-')
763: s++; /* Skip cmdline '-', if any */
1.120 dtucker 764: if (*s == '\0')
1.97 jakob 765: goto out;
1.121 djm 766:
1.122 djm 767: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 768: logit("Commands:");
1.164 djm 769: logit(" -L[bind_address:]port:host:hostport "
770: "Request local forward");
771: logit(" -R[bind_address:]port:host:hostport "
772: "Request remote forward");
1.165 stevesk 773: logit(" -KR[bind_address:]port "
1.164 djm 774: "Cancel remote forward");
1.146 reyk 775: if (!options.permit_local_command)
776: goto out;
1.164 djm 777: logit(" !args "
778: "Execute local command");
1.146 reyk 779: goto out;
780: }
781:
782: if (*s == '!' && options.permit_local_command) {
783: s++;
784: ssh_local_cmd(s);
1.121 djm 785: goto out;
786: }
787:
788: if (*s == 'K') {
789: delete = 1;
790: s++;
791: }
792: if (*s != 'L' && *s != 'R') {
1.109 itojun 793: logit("Invalid command.");
1.97 jakob 794: goto out;
795: }
1.121 djm 796: if (*s == 'L')
1.97 jakob 797: local = 1;
1.121 djm 798: if (local && delete) {
799: logit("Not supported.");
800: goto out;
801: }
802: if ((!local || delete) && !compat20) {
1.109 itojun 803: logit("Not supported for SSH protocol version 1.");
1.97 jakob 804: goto out;
805: }
1.121 djm 806:
1.179 tedu 807: while (isspace(*++s))
808: ;
1.97 jakob 809:
1.121 djm 810: if (delete) {
1.135 djm 811: cancel_port = 0;
812: cancel_host = hpdelim(&s); /* may be NULL */
813: if (s != NULL) {
814: cancel_port = a2port(s);
815: cancel_host = cleanhostname(cancel_host);
816: } else {
817: cancel_port = a2port(cancel_host);
818: cancel_host = NULL;
1.121 djm 819: }
1.135 djm 820: if (cancel_port == 0) {
821: logit("Bad forwarding close port");
1.121 djm 822: goto out;
823: }
1.135 djm 824: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 825: } else {
1.135 djm 826: if (!parse_forward(&fwd, s)) {
1.121 djm 827: logit("Bad forwarding specification.");
828: goto out;
829: }
830: if (local) {
1.135 djm 831: if (channel_setup_local_fwd_listener(fwd.listen_host,
832: fwd.listen_port, fwd.connect_host,
833: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 834: logit("Port forwarding failed.");
835: goto out;
836: }
1.135 djm 837: } else {
1.167 markus 838: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 839: fwd.listen_port, fwd.connect_host,
1.167 markus 840: fwd.connect_port) < 0) {
841: logit("Port forwarding failed.");
842: goto out;
843: }
1.135 djm 844: }
845:
1.121 djm 846: logit("Forwarding port.");
847: }
848:
1.97 jakob 849: out:
850: signal(SIGINT, handler);
851: enter_raw_mode();
852: if (cmd)
853: xfree(cmd);
1.183 djm 854: if (fwd.listen_host != NULL)
855: xfree(fwd.listen_host);
856: if (fwd.connect_host != NULL)
857: xfree(fwd.connect_host);
1.97 jakob 858: }
859:
1.195 djm 860: /*
861: * Process the characters one by one, call with c==NULL for proto1 case.
862: */
1.77 itojun 863: static int
1.195 djm 864: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
865: char *buf, int len)
1.31 markus 866: {
1.32 markus 867: char string[1024];
1.31 markus 868: pid_t pid;
869: int bytes = 0;
1.42 markus 870: u_int i;
871: u_char ch;
1.31 markus 872: char *s;
1.195 djm 873: int *escape_pendingp, escape_char;
874: struct escape_filter_ctx *efc;
1.31 markus 875:
1.195 djm 876: if (c == NULL) {
877: escape_pendingp = &escape_pending1;
878: escape_char = escape_char1;
879: } else {
880: if (c->filter_ctx == NULL)
881: return 0;
882: efc = (struct escape_filter_ctx *)c->filter_ctx;
883: escape_pendingp = &efc->escape_pending;
884: escape_char = efc->escape_char;
885: }
886:
1.139 djm 887: if (len <= 0)
888: return (0);
889:
890: for (i = 0; i < (u_int)len; i++) {
1.31 markus 891: /* Get one character at a time. */
892: ch = buf[i];
893:
1.195 djm 894: if (*escape_pendingp) {
1.31 markus 895: /* We have previously seen an escape character. */
896: /* Clear the flag now. */
1.195 djm 897: *escape_pendingp = 0;
1.31 markus 898:
899: /* Process the escaped character. */
900: switch (ch) {
901: case '.':
902: /* Terminate the connection. */
1.195 djm 903: snprintf(string, sizeof string, "%c.\r\n",
904: escape_char);
1.32 markus 905: buffer_append(berr, string, strlen(string));
1.31 markus 906:
1.195 djm 907: if (c && c->ctl_fd != -1) {
908: chan_read_failed(c);
909: chan_write_failed(c);
910: return 0;
911: } else
912: quit_pending = 1;
1.31 markus 913: return -1;
914:
915: case 'Z' - 64:
1.195 djm 916: /* XXX support this for mux clients */
917: if (c && c->ctl_fd != -1) {
918: noescape:
919: snprintf(string, sizeof string,
920: "%c%c escape not available to "
921: "multiplexed sessions\r\n",
922: escape_char, ch);
923: buffer_append(berr, string,
924: strlen(string));
925: continue;
926: }
1.31 markus 927: /* Suspend the program. */
928: /* Print a message to that effect to the user. */
1.195 djm 929: snprintf(string, sizeof string,
930: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 931: buffer_append(berr, string, strlen(string));
1.31 markus 932:
933: /* Restore terminal modes and suspend. */
934: client_suspend_self(bin, bout, berr);
935:
936: /* We have been continued. */
937: continue;
938:
1.111 markus 939: case 'B':
940: if (compat20) {
941: snprintf(string, sizeof string,
942: "%cB\r\n", escape_char);
943: buffer_append(berr, string,
944: strlen(string));
945: channel_request_start(session_ident,
946: "break", 0);
947: packet_put_int(1000);
948: packet_send();
949: }
950: continue;
951:
1.54 markus 952: case 'R':
1.59 markus 953: if (compat20) {
954: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 955: logit("Server does not support re-keying");
1.59 markus 956: else
957: need_rekeying = 1;
958: }
1.54 markus 959: continue;
960:
1.31 markus 961: case '&':
1.195 djm 962: if (c && c->ctl_fd != -1)
963: goto noescape;
1.31 markus 964: /*
965: * Detach the program (continue to serve connections,
966: * but put in background and no more new connections).
967: */
968: /* Restore tty modes. */
969: leave_raw_mode();
970:
971: /* Stop listening for new connections. */
1.86 markus 972: channel_stop_listening();
1.31 markus 973:
1.86 markus 974: snprintf(string, sizeof string,
975: "%c& [backgrounded]\n", escape_char);
976: buffer_append(berr, string, strlen(string));
1.31 markus 977:
978: /* Fork into background. */
979: pid = fork();
980: if (pid < 0) {
981: error("fork: %.100s", strerror(errno));
982: continue;
983: }
984: if (pid != 0) { /* This is the parent. */
985: /* The parent just exits. */
986: exit(0);
987: }
988: /* The child continues serving connections. */
1.86 markus 989: if (compat20) {
990: buffer_append(bin, "\004", 1);
991: /* fake EOF on stdin */
992: return -1;
993: } else if (!stdin_eof) {
994: /*
995: * Sending SSH_CMSG_EOF alone does not always appear
996: * to be enough. So we try to send an EOF character
997: * first.
998: */
999: packet_start(SSH_CMSG_STDIN_DATA);
1000: packet_put_string("\004", 1);
1001: packet_send();
1002: /* Close stdin. */
1003: stdin_eof = 1;
1004: if (buffer_len(bin) == 0) {
1005: packet_start(SSH_CMSG_EOF);
1006: packet_send();
1007: }
1008: }
1009: continue;
1.31 markus 1010:
1011: case '?':
1.195 djm 1012: if (c && c->ctl_fd != -1) {
1013: snprintf(string, sizeof string,
1014: "%c?\r\n\
1015: Supported escape sequences:\r\n\
1016: %c. - terminate session\r\n\
1017: %cB - send a BREAK to the remote system\r\n\
1018: %cC - open a command line\r\n\
1019: %cR - Request rekey (SSH protocol 2 only)\r\n\
1020: %c# - list forwarded connections\r\n\
1021: %c? - this message\r\n\
1022: %c%c - send the escape character by typing it twice\r\n\
1023: (Note that escapes are only recognized immediately after newline.)\r\n",
1024: escape_char, escape_char,
1025: escape_char, escape_char,
1026: escape_char, escape_char,
1027: escape_char, escape_char,
1028: escape_char);
1029: } else {
1030: snprintf(string, sizeof string,
1.31 markus 1031: "%c?\r\n\
1032: Supported escape sequences:\r\n\
1.195 djm 1033: %c. - terminate connection (and any multiplexed sessions)\r\n\
1034: %cB - send a BREAK to the remote system\r\n\
1035: %cC - open a command line\r\n\
1036: %cR - Request rekey (SSH protocol 2 only)\r\n\
1037: %c^Z - suspend ssh\r\n\
1038: %c# - list forwarded connections\r\n\
1039: %c& - background ssh (when waiting for connections to terminate)\r\n\
1040: %c? - this message\r\n\
1041: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1042: (Note that escapes are only recognized immediately after newline.)\r\n",
1.195 djm 1043: escape_char, escape_char,
1044: escape_char, escape_char,
1045: escape_char, escape_char,
1046: escape_char, escape_char,
1047: escape_char, escape_char,
1048: escape_char);
1049: }
1.32 markus 1050: buffer_append(berr, string, strlen(string));
1.31 markus 1051: continue;
1052:
1053: case '#':
1.195 djm 1054: snprintf(string, sizeof string, "%c#\r\n",
1055: escape_char);
1.32 markus 1056: buffer_append(berr, string, strlen(string));
1.31 markus 1057: s = channel_open_message();
1058: buffer_append(berr, s, strlen(s));
1059: xfree(s);
1.97 jakob 1060: continue;
1061:
1062: case 'C':
1.99 markus 1063: process_cmdline();
1.31 markus 1064: continue;
1065:
1066: default:
1067: if (ch != escape_char) {
1068: buffer_put_char(bin, escape_char);
1069: bytes++;
1070: }
1071: /* Escaped characters fall through here */
1072: break;
1073: }
1074: } else {
1075: /*
1076: * The previous character was not an escape char. Check if this
1077: * is an escape.
1078: */
1079: if (last_was_cr && ch == escape_char) {
1080: /* It is. Set the flag and continue to next character. */
1.195 djm 1081: *escape_pendingp = 1;
1.31 markus 1082: continue;
1083: }
1084: }
1085:
1086: /*
1087: * Normal character. Record whether it was a newline,
1088: * and append it to the buffer.
1089: */
1090: last_was_cr = (ch == '\r' || ch == '\n');
1091: buffer_put_char(bin, ch);
1092: bytes++;
1093: }
1094: return bytes;
1095: }
1096:
1.77 itojun 1097: static void
1.161 deraadt 1098: client_process_input(fd_set *readset)
1.17 markus 1099: {
1.21 deraadt 1100: int len;
1.31 markus 1101: char buf[8192];
1.16 markus 1102:
1.11 markus 1103: /* Read input from stdin. */
1104: if (FD_ISSET(fileno(stdin), readset)) {
1105: /* Read as much as possible. */
1106: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1107: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1108: return; /* we'll try again later */
1.11 markus 1109: if (len <= 0) {
1.13 markus 1110: /*
1111: * Received EOF or error. They are treated
1112: * similarly, except that an error message is printed
1113: * if it was an error condition.
1114: */
1.11 markus 1115: if (len < 0) {
1116: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1117: buffer_append(&stderr_buffer, buf, strlen(buf));
1118: }
1119: /* Mark that we have seen EOF. */
1120: stdin_eof = 1;
1.13 markus 1121: /*
1122: * Send an EOF message to the server unless there is
1123: * data in the buffer. If there is data in the
1124: * buffer, no message will be sent now. Code
1125: * elsewhere will send the EOF when the buffer
1126: * becomes empty if stdin_eof is set.
1127: */
1.11 markus 1128: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1129: packet_start(SSH_CMSG_EOF);
1130: packet_send();
1.11 markus 1131: }
1.195 djm 1132: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1133: /*
1134: * Normal successful read, and no escape character.
1135: * Just append the data to buffer.
1136: */
1.11 markus 1137: buffer_append(&stdin_buffer, buf, len);
1138: } else {
1.13 markus 1139: /*
1140: * Normal, successful read. But we have an escape character
1141: * and have to process the characters one by one.
1142: */
1.195 djm 1143: if (process_escapes(NULL, &stdin_buffer,
1144: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1145: return;
1.11 markus 1146: }
1147: }
1148: }
1149:
1.77 itojun 1150: static void
1.161 deraadt 1151: client_process_output(fd_set *writeset)
1.11 markus 1152: {
1153: int len;
1154: char buf[100];
1.1 deraadt 1155:
1.11 markus 1156: /* Write buffered output to stdout. */
1157: if (FD_ISSET(fileno(stdout), writeset)) {
1158: /* Write as much data as possible. */
1159: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1160: buffer_len(&stdout_buffer));
1.11 markus 1161: if (len <= 0) {
1.64 markus 1162: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1163: len = 0;
1164: else {
1.13 markus 1165: /*
1166: * An error or EOF was encountered. Put an
1167: * error message to stderr buffer.
1168: */
1.11 markus 1169: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1170: buffer_append(&stderr_buffer, buf, strlen(buf));
1171: quit_pending = 1;
1172: return;
1173: }
1174: }
1175: /* Consume printed data from the buffer. */
1176: buffer_consume(&stdout_buffer, len);
1.57 markus 1177: stdout_bytes += len;
1.11 markus 1178: }
1179: /* Write buffered output to stderr. */
1180: if (FD_ISSET(fileno(stderr), writeset)) {
1181: /* Write as much data as possible. */
1182: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1183: buffer_len(&stderr_buffer));
1.11 markus 1184: if (len <= 0) {
1.64 markus 1185: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1186: len = 0;
1187: else {
1.13 markus 1188: /* EOF or error, but can't even print error message. */
1.11 markus 1189: quit_pending = 1;
1190: return;
1191: }
1192: }
1193: /* Consume printed characters from the buffer. */
1194: buffer_consume(&stderr_buffer, len);
1.57 markus 1195: stderr_bytes += len;
1.11 markus 1196: }
1.1 deraadt 1197: }
1198:
1.13 markus 1199: /*
1.15 markus 1200: * Get packets from the connection input buffer, and process them as long as
1201: * there are packets available.
1202: *
1203: * Any unknown packets received during the actual
1204: * session cause the session to terminate. This is
1205: * intended to make debugging easier since no
1206: * confirmations are sent. Any compatible protocol
1207: * extensions must be negotiated during the
1208: * preparatory phase.
1209: */
1210:
1.77 itojun 1211: static void
1.49 itojun 1212: client_process_buffered_input_packets(void)
1.15 markus 1213: {
1.54 markus 1214: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1215: }
1216:
1.31 markus 1217: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1218:
1.195 djm 1219: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1220: void *
1221: client_new_escape_filter_ctx(int escape_char)
1222: {
1223: struct escape_filter_ctx *ret;
1224:
1225: ret = xmalloc(sizeof(*ret));
1226: ret->escape_pending = 0;
1227: ret->escape_char = escape_char;
1228: return (void *)ret;
1229: }
1230:
1231: int
1232: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1233: {
1.190 djm 1234: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1235: return 0;
1236:
1.195 djm 1237: return process_escapes(c, &c->input, &c->output, &c->extended,
1238: buf, len);
1.30 markus 1239: }
1240:
1.77 itojun 1241: static void
1.60 markus 1242: client_channel_closed(int id, void *arg)
1243: {
1.83 markus 1244: channel_cancel_cleanup(id);
1.60 markus 1245: session_closed = 1;
1.113 markus 1246: leave_raw_mode();
1.60 markus 1247: }
1248:
1.15 markus 1249: /*
1.13 markus 1250: * Implements the interactive session with the server. This is called after
1251: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1252: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1253: * used as an escape character for terminating or suspending the session.
1.13 markus 1254: */
1.1 deraadt 1255:
1.20 markus 1256: int
1.30 markus 1257: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1258: {
1.46 markus 1259: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1260: double start_time, total_time;
1.130 avsm 1261: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1262: u_int nalloc = 0;
1.11 markus 1263: char buf[100];
1264:
1265: debug("Entering interactive session.");
1266:
1267: start_time = get_current_time();
1268:
1269: /* Initialize variables. */
1.195 djm 1270: escape_pending1 = 0;
1.11 markus 1271: last_was_cr = 1;
1272: exit_status = -1;
1273: stdin_eof = 0;
1274: buffer_high = 64 * 1024;
1275: connection_in = packet_get_connection_in();
1276: connection_out = packet_get_connection_out();
1.46 markus 1277: max_fd = MAX(connection_in, connection_out);
1.192 djm 1278: if (muxserver_sock != -1)
1279: max_fd = MAX(max_fd, muxserver_sock);
1.46 markus 1280:
1281: if (!compat20) {
1.63 markus 1282: /* enable nonblocking unless tty */
1283: if (!isatty(fileno(stdin)))
1284: set_nonblock(fileno(stdin));
1285: if (!isatty(fileno(stdout)))
1286: set_nonblock(fileno(stdout));
1287: if (!isatty(fileno(stderr)))
1288: set_nonblock(fileno(stderr));
1.46 markus 1289: max_fd = MAX(max_fd, fileno(stdin));
1290: max_fd = MAX(max_fd, fileno(stdout));
1291: max_fd = MAX(max_fd, fileno(stderr));
1292: }
1.11 markus 1293: stdin_bytes = 0;
1294: stdout_bytes = 0;
1295: stderr_bytes = 0;
1296: quit_pending = 0;
1.195 djm 1297: escape_char1 = escape_char_arg;
1.11 markus 1298:
1299: /* Initialize buffers. */
1300: buffer_init(&stdin_buffer);
1301: buffer_init(&stdout_buffer);
1302: buffer_init(&stderr_buffer);
1303:
1.15 markus 1304: client_init_dispatch();
1305:
1.105 markus 1306: /*
1307: * Set signal handlers, (e.g. to restore non-blocking mode)
1308: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1309: */
1.131 djm 1310: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1311: signal(SIGHUP, signal_handler);
1.105 markus 1312: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1313: signal(SIGINT, signal_handler);
1314: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1315: signal(SIGQUIT, signal_handler);
1316: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1317: signal(SIGTERM, signal_handler);
1.132 djm 1318: signal(SIGWINCH, window_change_handler);
1.11 markus 1319:
1320: if (have_pty)
1321: enter_raw_mode();
1322:
1.48 markus 1323: if (compat20) {
1324: session_ident = ssh2_chan_id;
1.195 djm 1325: if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1.48 markus 1326: channel_register_filter(session_ident,
1.195 djm 1327: client_simple_escape_filter, NULL,
1328: client_new_escape_filter_ctx(escape_char_arg));
1.60 markus 1329: if (session_ident != -1)
1330: channel_register_cleanup(session_ident,
1.143 djm 1331: client_channel_closed, 0);
1.48 markus 1332: } else {
1333: /* Check if we should immediately send eof on stdin. */
1.16 markus 1334: client_check_initial_eof_on_stdin();
1.48 markus 1335: }
1.30 markus 1336:
1.11 markus 1337: /* Main loop of the client for the interactive session mode. */
1338: while (!quit_pending) {
1339:
1.13 markus 1340: /* Process buffered packets sent by the server. */
1.11 markus 1341: client_process_buffered_input_packets();
1342:
1.60 markus 1343: if (compat20 && session_closed && !channel_still_open())
1344: break;
1345:
1.56 markus 1346: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1347:
1.56 markus 1348: if (rekeying) {
1349: debug("rekeying in progress");
1350: } else {
1351: /*
1352: * Make packets of buffered stdin data, and buffer
1353: * them for sending to the server.
1354: */
1355: if (!compat20)
1356: client_make_packets_from_stdin_data();
1.11 markus 1357:
1.56 markus 1358: /*
1359: * Make packets from buffered channel data, and
1360: * enqueue them for sending to the server.
1361: */
1362: if (packet_not_very_much_data_to_write())
1363: channel_output_poll();
1.11 markus 1364:
1.56 markus 1365: /*
1366: * Check if the window size has changed, and buffer a
1367: * message about it to the server if so.
1368: */
1369: client_check_window_change();
1.11 markus 1370:
1.56 markus 1371: if (quit_pending)
1372: break;
1373: }
1.13 markus 1374: /*
1375: * Wait until we have something to do (something becomes
1376: * available on one of the descriptors).
1377: */
1.81 markus 1378: max_fd2 = max_fd;
1.56 markus 1379: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1380: &max_fd2, &nalloc, rekeying);
1.11 markus 1381:
1382: if (quit_pending)
1383: break;
1384:
1.56 markus 1385: /* Do channel operations unless rekeying in progress. */
1386: if (!rekeying) {
1387: channel_after_select(readset, writeset);
1.108 markus 1388: if (need_rekeying || packet_need_rekeying()) {
1389: debug("need rekeying");
1.56 markus 1390: xxx_kex->done = 0;
1391: kex_send_kexinit(xxx_kex);
1392: need_rekeying = 0;
1393: }
1394: }
1.11 markus 1395:
1.17 markus 1396: /* Buffer input from the connection. */
1.46 markus 1397: client_process_net_input(readset);
1.17 markus 1398:
1.123 djm 1399: /* Accept control connections. */
1.192 djm 1400: if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1401: if (muxserver_accept_control())
1402: quit_pending = 1;
1403: }
1.123 djm 1404:
1.17 markus 1405: if (quit_pending)
1406: break;
1.11 markus 1407:
1.17 markus 1408: if (!compat20) {
1409: /* Buffer data from stdin */
1.46 markus 1410: client_process_input(readset);
1.17 markus 1411: /*
1412: * Process output to stdout and stderr. Output to
1413: * the connection is processed elsewhere (above).
1414: */
1.46 markus 1415: client_process_output(writeset);
1.17 markus 1416: }
1.11 markus 1417:
1.13 markus 1418: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1419: if (FD_ISSET(connection_out, writeset))
1.11 markus 1420: packet_write_poll();
1421: }
1.46 markus 1422: if (readset)
1423: xfree(readset);
1424: if (writeset)
1425: xfree(writeset);
1.11 markus 1426:
1427: /* Terminate the session. */
1428:
1429: /* Stop watching for window change. */
1.132 djm 1430: signal(SIGWINCH, SIG_DFL);
1.11 markus 1431:
1.76 markus 1432: channel_free_all();
1.11 markus 1433:
1.75 markus 1434: if (have_pty)
1435: leave_raw_mode();
1436:
1437: /* restore blocking io */
1438: if (!isatty(fileno(stdin)))
1439: unset_nonblock(fileno(stdin));
1440: if (!isatty(fileno(stdout)))
1441: unset_nonblock(fileno(stdout));
1442: if (!isatty(fileno(stderr)))
1443: unset_nonblock(fileno(stderr));
1.116 dtucker 1444:
1445: /*
1446: * If there was no shell or command requested, there will be no remote
1447: * exit status to be returned. In that case, clear error code if the
1448: * connection was deliberately terminated at this end.
1449: */
1450: if (no_shell_flag && received_signal == SIGTERM) {
1451: received_signal = 0;
1452: exit_status = 0;
1453: }
1.75 markus 1454:
1.113 markus 1455: if (received_signal)
1.89 itojun 1456: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1457:
1.13 markus 1458: /*
1459: * In interactive mode (with pseudo tty) display a message indicating
1460: * that the connection has been closed.
1461: */
1.11 markus 1462: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1463: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1464: buffer_append(&stderr_buffer, buf, strlen(buf));
1465: }
1.70 markus 1466:
1.11 markus 1467: /* Output any buffered data for stdout. */
1.70 markus 1468: while (buffer_len(&stdout_buffer) > 0) {
1469: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1470: buffer_len(&stdout_buffer));
1.70 markus 1471: if (len <= 0) {
1.11 markus 1472: error("Write failed flushing stdout buffer.");
1.70 markus 1473: break;
1474: }
1.11 markus 1475: buffer_consume(&stdout_buffer, len);
1.57 markus 1476: stdout_bytes += len;
1.11 markus 1477: }
1478:
1479: /* Output any buffered data for stderr. */
1.70 markus 1480: while (buffer_len(&stderr_buffer) > 0) {
1481: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1482: buffer_len(&stderr_buffer));
1.70 markus 1483: if (len <= 0) {
1.11 markus 1484: error("Write failed flushing stderr buffer.");
1.70 markus 1485: break;
1486: }
1.11 markus 1487: buffer_consume(&stderr_buffer, len);
1.57 markus 1488: stderr_bytes += len;
1.11 markus 1489: }
1490:
1491: /* Clear and free any buffers. */
1492: memset(buf, 0, sizeof(buf));
1493: buffer_free(&stdin_buffer);
1494: buffer_free(&stdout_buffer);
1495: buffer_free(&stderr_buffer);
1496:
1497: /* Report bytes transferred, and transfer rates. */
1498: total_time = get_current_time() - start_time;
1499: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1500: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1501: if (total_time > 0)
1502: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1503: stdin_bytes / total_time, stdout_bytes / total_time,
1504: stderr_bytes / total_time);
1.11 markus 1505:
1506: /* Return the exit status of the program. */
1507: debug("Exit status %d", exit_status);
1508: return exit_status;
1.15 markus 1509: }
1510:
1511: /*********/
1512:
1.77 itojun 1513: static void
1.94 markus 1514: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1515: {
1.42 markus 1516: u_int data_len;
1.15 markus 1517: char *data = packet_get_string(&data_len);
1.93 markus 1518: packet_check_eom();
1.15 markus 1519: buffer_append(&stdout_buffer, data, data_len);
1520: memset(data, 0, data_len);
1521: xfree(data);
1522: }
1.77 itojun 1523: static void
1.94 markus 1524: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1525: {
1.42 markus 1526: u_int data_len;
1.15 markus 1527: char *data = packet_get_string(&data_len);
1.93 markus 1528: packet_check_eom();
1.15 markus 1529: buffer_append(&stderr_buffer, data, data_len);
1530: memset(data, 0, data_len);
1531: xfree(data);
1532: }
1.77 itojun 1533: static void
1.94 markus 1534: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1535: {
1536: exit_status = packet_get_int();
1.93 markus 1537: packet_check_eom();
1.15 markus 1538: /* Acknowledge the exit. */
1539: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1540: packet_send();
1541: /*
1542: * Must wait for packet to be sent since we are
1543: * exiting the loop.
1544: */
1545: packet_write_wait();
1546: /* Flag that we want to exit. */
1547: quit_pending = 1;
1548: }
1.115 markus 1549: static void
1550: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1551: {
1552: Channel *c = NULL;
1553: int remote_id, sock;
1554:
1555: /* Read the remote channel number from the message. */
1556: remote_id = packet_get_int();
1557: packet_check_eom();
1558:
1559: /*
1560: * Get a connection to the local authentication agent (this may again
1561: * get forwarded).
1562: */
1563: sock = ssh_get_authentication_socket();
1564:
1565: /*
1566: * If we could not connect the agent, send an error message back to
1567: * the server. This should never happen unless the agent dies,
1568: * because authentication forwarding is only enabled if we have an
1569: * agent.
1570: */
1571: if (sock >= 0) {
1572: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1573: -1, 0, 0, 0, "authentication agent connection", 1);
1574: c->remote_id = remote_id;
1575: c->force_drain = 1;
1576: }
1577: if (c == NULL) {
1578: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1579: packet_put_int(remote_id);
1580: } else {
1581: /* Send a confirmation to the remote host. */
1582: debug("Forwarding authentication connection.");
1583: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1584: packet_put_int(remote_id);
1585: packet_put_int(c->self);
1586: }
1587: packet_send();
1588: }
1.15 markus 1589:
1.77 itojun 1590: static Channel *
1.40 markus 1591: client_request_forwarded_tcpip(const char *request_type, int rchan)
1592: {
1.103 deraadt 1593: Channel *c = NULL;
1.40 markus 1594: char *listen_address, *originator_address;
1595: int listen_port, originator_port;
1596:
1597: /* Get rest of the packet */
1598: listen_address = packet_get_string(NULL);
1599: listen_port = packet_get_int();
1600: originator_address = packet_get_string(NULL);
1601: originator_port = packet_get_int();
1.93 markus 1602: packet_check_eom();
1.40 markus 1603:
1.191 djm 1604: debug("client_request_forwarded_tcpip: listen %s port %d, "
1605: "originator %s port %d", listen_address, listen_port,
1606: originator_address, originator_port);
1607:
1608: c = channel_connect_by_listen_address(listen_port,
1609: "forwarded-tcpip", originator_address);
1.40 markus 1610:
1611: xfree(originator_address);
1612: xfree(listen_address);
1613: return c;
1614: }
1615:
1.103 deraadt 1616: static Channel *
1.40 markus 1617: client_request_x11(const char *request_type, int rchan)
1618: {
1619: Channel *c = NULL;
1620: char *originator;
1621: int originator_port;
1.67 markus 1622: int sock;
1.40 markus 1623:
1624: if (!options.forward_x11) {
1625: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1626: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1627: return NULL;
1628: }
1629: originator = packet_get_string(NULL);
1630: if (datafellows & SSH_BUG_X11FWD) {
1631: debug2("buggy server: x11 request w/o originator_port");
1632: originator_port = 0;
1633: } else {
1634: originator_port = packet_get_int();
1635: }
1.93 markus 1636: packet_check_eom();
1.40 markus 1637: /* XXX check permission */
1.47 markus 1638: debug("client_request_x11: request from %s %d", originator,
1639: originator_port);
1.67 markus 1640: xfree(originator);
1.40 markus 1641: sock = x11_connect_display();
1.67 markus 1642: if (sock < 0)
1643: return NULL;
1644: c = channel_new("x11",
1645: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1646: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1647: c->force_drain = 1;
1.40 markus 1648: return c;
1649: }
1650:
1.103 deraadt 1651: static Channel *
1.40 markus 1652: client_request_agent(const char *request_type, int rchan)
1653: {
1654: Channel *c = NULL;
1.67 markus 1655: int sock;
1.40 markus 1656:
1657: if (!options.forward_agent) {
1658: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1659: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1660: return NULL;
1661: }
1.177 stevesk 1662: sock = ssh_get_authentication_socket();
1.67 markus 1663: if (sock < 0)
1664: return NULL;
1665: c = channel_new("authentication agent connection",
1666: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1667: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1668: "authentication agent connection", 1);
1.82 markus 1669: c->force_drain = 1;
1.40 markus 1670: return c;
1.180 djm 1671: }
1672:
1673: int
1674: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1675: {
1676: Channel *c;
1677: int fd;
1678:
1679: if (tun_mode == SSH_TUNMODE_NO)
1680: return 0;
1681:
1682: if (!compat20) {
1683: error("Tunnel forwarding is not support for protocol 1");
1684: return -1;
1685: }
1686:
1687: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1688:
1689: /* Open local tunnel device */
1690: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1691: error("Tunnel device open failed.");
1692: return -1;
1693: }
1694:
1695: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1696: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1697: c->datagram = 1;
1698:
1699: packet_start(SSH2_MSG_CHANNEL_OPEN);
1700: packet_put_cstring("tun@openssh.com");
1701: packet_put_int(c->self);
1702: packet_put_int(c->local_window_max);
1703: packet_put_int(c->local_maxpacket);
1704: packet_put_int(tun_mode);
1705: packet_put_int(remote_tun);
1706: packet_send();
1707:
1708: return 0;
1.40 markus 1709: }
1710:
1.22 markus 1711: /* XXXX move to generic input handler */
1.77 itojun 1712: static void
1.94 markus 1713: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1714: {
1715: Channel *c = NULL;
1716: char *ctype;
1717: int rchan;
1.102 markus 1718: u_int rmaxpack, rwindow, len;
1.22 markus 1719:
1720: ctype = packet_get_string(&len);
1721: rchan = packet_get_int();
1722: rwindow = packet_get_int();
1723: rmaxpack = packet_get_int();
1724:
1.24 markus 1725: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1726: ctype, rchan, rwindow, rmaxpack);
1727:
1.40 markus 1728: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1729: c = client_request_forwarded_tcpip(ctype, rchan);
1730: } else if (strcmp(ctype, "x11") == 0) {
1731: c = client_request_x11(ctype, rchan);
1732: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1733: c = client_request_agent(ctype, rchan);
1.22 markus 1734: }
1735: /* XXX duplicate : */
1736: if (c != NULL) {
1737: debug("confirm %s", ctype);
1738: c->remote_id = rchan;
1739: c->remote_window = rwindow;
1740: c->remote_maxpacket = rmaxpack;
1.69 markus 1741: if (c->type != SSH_CHANNEL_CONNECTING) {
1742: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1743: packet_put_int(c->remote_id);
1744: packet_put_int(c->self);
1745: packet_put_int(c->local_window);
1746: packet_put_int(c->local_maxpacket);
1747: packet_send();
1748: }
1.22 markus 1749: } else {
1750: debug("failure %s", ctype);
1751: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1752: packet_put_int(rchan);
1753: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1754: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1755: packet_put_cstring("open failed");
1.66 markus 1756: packet_put_cstring("");
1757: }
1.22 markus 1758: packet_send();
1759: }
1760: xfree(ctype);
1761: }
1.77 itojun 1762: static void
1.94 markus 1763: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1764: {
1765: Channel *c = NULL;
1.123 djm 1766: int exitval, id, reply, success = 0;
1.48 markus 1767: char *rtype;
1768:
1769: id = packet_get_int();
1770: rtype = packet_get_string(NULL);
1771: reply = packet_get_char();
1772:
1773: debug("client_input_channel_req: channel %d rtype %s reply %d",
1774: id, rtype, reply);
1775:
1.128 djm 1776: if (id == -1) {
1777: error("client_input_channel_req: request for channel -1");
1778: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1779: error("client_input_channel_req: channel %d: unknown channel", id);
1.193 markus 1780: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1781: packet_check_eom();
1782: chan_rcvd_eow(c);
1.48 markus 1783: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1784: exitval = packet_get_int();
1785: if (id == session_ident) {
1786: success = 1;
1787: exit_status = exitval;
1788: } else if (c->ctl_fd == -1) {
1789: error("client_input_channel_req: unexpected channel %d",
1790: session_ident);
1791: } else {
1792: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1793: success = 1;
1794: }
1.93 markus 1795: packet_check_eom();
1.48 markus 1796: }
1797: if (reply) {
1798: packet_start(success ?
1799: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1800: packet_put_int(id);
1.48 markus 1801: packet_send();
1802: }
1803: xfree(rtype);
1804: }
1.95 markus 1805: static void
1806: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1807: {
1808: char *rtype;
1809: int want_reply;
1810: int success = 0;
1811:
1812: rtype = packet_get_string(NULL);
1813: want_reply = packet_get_char();
1.117 markus 1814: debug("client_input_global_request: rtype %s want_reply %d",
1815: rtype, want_reply);
1.95 markus 1816: if (want_reply) {
1817: packet_start(success ?
1818: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1819: packet_send();
1820: packet_write_wait();
1821: }
1822: xfree(rtype);
1823: }
1.22 markus 1824:
1.123 djm 1825: void
1.129 deraadt 1826: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 1827: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 1828: {
1829: int len;
1.132 djm 1830: Channel *c = NULL;
1.123 djm 1831:
1832: debug2("%s: id %d", __func__, id);
1833:
1.132 djm 1834: if ((c = channel_lookup(id)) == NULL)
1835: fatal("client_session2_setup: channel %d: unknown channel", id);
1836:
1.123 djm 1837: if (want_tty) {
1838: struct winsize ws;
1839:
1840: /* Store window size in the packet. */
1841: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1842: memset(&ws, 0, sizeof(ws));
1843:
1.190 djm 1844: channel_request_start(id, "pty-req", 1);
1845: client_expect_confirm(id, "PTY allocation", 0);
1.123 djm 1846: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1847: packet_put_int((u_int)ws.ws_col);
1848: packet_put_int((u_int)ws.ws_row);
1849: packet_put_int((u_int)ws.ws_xpixel);
1850: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 1851: if (tiop == NULL)
1852: tiop = get_saved_tio();
1853: tty_make_modes(-1, tiop);
1.123 djm 1854: packet_send();
1855: /* XXX wait for reply */
1.132 djm 1856: c->client_tty = 1;
1.123 djm 1857: }
1858:
1859: /* Transfer any environment variables from client to server */
1.126 djm 1860: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1861: int i, j, matched;
1862: char *name, *val;
1863:
1864: debug("Sending environment.");
1.126 djm 1865: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1866: /* Split */
1.126 djm 1867: name = xstrdup(env[i]);
1.123 djm 1868: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1869: xfree(name);
1.123 djm 1870: continue;
1871: }
1872: *val++ = '\0';
1873:
1874: matched = 0;
1875: for (j = 0; j < options.num_send_env; j++) {
1876: if (match_pattern(name, options.send_env[j])) {
1877: matched = 1;
1878: break;
1879: }
1880: }
1881: if (!matched) {
1882: debug3("Ignored env %s", name);
1.144 stevesk 1883: xfree(name);
1.123 djm 1884: continue;
1885: }
1886:
1887: debug("Sending env %s = %s", name, val);
1888: channel_request_start(id, "env", 0);
1889: packet_put_cstring(name);
1890: packet_put_cstring(val);
1891: packet_send();
1.144 stevesk 1892: xfree(name);
1.123 djm 1893: }
1894: }
1895:
1896: len = buffer_len(cmd);
1897: if (len > 0) {
1898: if (len > 900)
1899: len = 900;
1900: if (want_subsystem) {
1.190 djm 1901: debug("Sending subsystem: %.*s",
1902: len, (u_char*)buffer_ptr(cmd));
1903: channel_request_start(id, "subsystem", 1);
1904: client_expect_confirm(id, "subsystem", 1);
1.123 djm 1905: } else {
1.190 djm 1906: debug("Sending command: %.*s",
1907: len, (u_char*)buffer_ptr(cmd));
1908: channel_request_start(id, "exec", 1);
1909: client_expect_confirm(id, "exec", 1);
1.123 djm 1910: }
1911: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1912: packet_send();
1913: } else {
1.190 djm 1914: channel_request_start(id, "shell", 1);
1915: client_expect_confirm(id, "shell", 1);
1.123 djm 1916: packet_send();
1917: }
1918: }
1919:
1.77 itojun 1920: static void
1.49 itojun 1921: client_init_dispatch_20(void)
1.16 markus 1922: {
1.55 markus 1923: dispatch_init(&dispatch_protocol_error);
1.100 markus 1924:
1.16 markus 1925: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1926: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1927: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1928: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1929: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1930: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1931: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1932: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1933: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 1934: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
1935: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 1936: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1937:
1938: /* rekeying */
1939: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1940:
1941: /* global request reply messages */
1942: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1943: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1944: }
1.77 itojun 1945: static void
1.49 itojun 1946: client_init_dispatch_13(void)
1.15 markus 1947: {
1948: dispatch_init(NULL);
1949: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1950: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1951: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1952: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1953: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1954: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1955: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1956: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1957: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1958:
1959: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1960: &client_input_agent_open : &deny_input_open);
1.39 markus 1961: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1962: &x11_input_open : &deny_input_open);
1.15 markus 1963: }
1.77 itojun 1964: static void
1.49 itojun 1965: client_init_dispatch_15(void)
1.15 markus 1966: {
1967: client_init_dispatch_13();
1968: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1969: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1970: }
1.79 stevesk 1971: static void
1.49 itojun 1972: client_init_dispatch(void)
1.15 markus 1973: {
1.16 markus 1974: if (compat20)
1975: client_init_dispatch_20();
1976: else if (compat13)
1.15 markus 1977: client_init_dispatch_13();
1978: else
1979: client_init_dispatch_15();
1.113 markus 1980: }
1981:
1982: /* client specific fatal cleanup */
1983: void
1.114 markus 1984: cleanup_exit(int i)
1.113 markus 1985: {
1986: leave_raw_mode();
1987: leave_non_blocking();
1.192 djm 1988: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 1989: unlink(options.control_path);
1.114 markus 1990: _exit(i);
1.1 deraadt 1991: }
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