Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.215
1.215 ! djm 1: /* $OpenBSD: clientloop.c,v 1.214 2009/10/24 11:15:29 andreas Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.172 stevesk 68: #include <sys/param.h>
1.189 djm 69: #include <sys/queue.h>
1.150 stevesk 70:
1.155 stevesk 71: #include <ctype.h>
1.168 stevesk 72: #include <errno.h>
1.151 stevesk 73: #include <paths.h>
1.153 stevesk 74: #include <signal.h>
1.174 stevesk 75: #include <stdio.h>
1.173 stevesk 76: #include <stdlib.h>
1.170 stevesk 77: #include <string.h>
1.150 stevesk 78: #include <termios.h>
1.175 deraadt 79: #include <pwd.h>
1.169 stevesk 80: #include <unistd.h>
1.1 deraadt 81:
1.175 deraadt 82: #include "xmalloc.h"
1.45 markus 83: #include "ssh.h"
84: #include "ssh1.h"
85: #include "ssh2.h"
1.1 deraadt 86: #include "packet.h"
87: #include "buffer.h"
1.15 markus 88: #include "compat.h"
1.74 markus 89: #include "channels.h"
1.15 markus 90: #include "dispatch.h"
1.40 markus 91: #include "key.h"
1.175 deraadt 92: #include "cipher.h"
1.54 markus 93: #include "kex.h"
1.45 markus 94: #include "log.h"
95: #include "readconf.h"
96: #include "clientloop.h"
1.147 djm 97: #include "sshconnect.h"
1.40 markus 98: #include "authfd.h"
1.45 markus 99: #include "atomicio.h"
1.118 deraadt 100: #include "sshpty.h"
1.63 markus 101: #include "misc.h"
1.123 djm 102: #include "match.h"
103: #include "msg.h"
1.212 andreas 104: #include "roaming.h"
1.39 markus 105:
106: /* import options */
107: extern Options options;
108:
1.1 deraadt 109: /* Flag indicating that stdin should be redirected from /dev/null. */
110: extern int stdin_null_flag;
111:
1.116 dtucker 112: /* Flag indicating that no shell has been requested */
113: extern int no_shell_flag;
114:
1.123 djm 115: /* Control socket */
1.192 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_int buffer_high;/* Soft max buffer size. */
1.11 markus 148: static int connection_in; /* Connection to server (input). */
149: static int connection_out; /* Connection to server (output). */
1.56 markus 150: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 151: static int session_closed = 0; /* In SSH2: login session closed. */
1.1 deraadt 152:
1.77 itojun 153: static void client_init_dispatch(void);
1.16 markus 154: int session_ident = -1;
155:
1.214 andreas 156: int session_resumed = 0;
157:
1.195 djm 158: /* Track escape per proto2 channel */
159: struct escape_filter_ctx {
160: int escape_pending;
161: int escape_char;
162: };
163:
164: /* Context for channel confirmation replies */
1.190 djm 165: struct channel_reply_ctx {
166: const char *request_type;
167: int id, do_close;
168: };
169:
1.196 djm 170: /* Global request success/failure callbacks */
171: struct global_confirm {
172: TAILQ_ENTRY(global_confirm) entry;
173: global_confirm_cb *cb;
174: void *ctx;
175: int ref_count;
176: };
177: TAILQ_HEAD(global_confirms, global_confirm);
178: static struct global_confirms global_confirms =
179: TAILQ_HEAD_INITIALIZER(global_confirms);
180:
1.54 markus 181: /*XXX*/
182: extern Kex *xxx_kex;
183:
1.123 djm 184: void ssh_process_session2_setup(int, int, int, Buffer *);
185:
1.1 deraadt 186: /* Restores stdin to blocking mode. */
187:
1.77 itojun 188: static void
1.49 itojun 189: leave_non_blocking(void)
1.1 deraadt 190: {
1.11 markus 191: if (in_non_blocking_mode) {
1.125 djm 192: unset_nonblock(fileno(stdin));
1.11 markus 193: in_non_blocking_mode = 0;
194: }
1.1 deraadt 195: }
196:
1.11 markus 197: /* Puts stdin terminal in non-blocking mode. */
198:
1.77 itojun 199: static void
1.49 itojun 200: enter_non_blocking(void)
1.1 deraadt 201: {
1.11 markus 202: in_non_blocking_mode = 1;
1.124 djm 203: set_nonblock(fileno(stdin));
1.1 deraadt 204: }
205:
1.13 markus 206: /*
207: * Signal handler for the window change signal (SIGWINCH). This just sets a
208: * flag indicating that the window has changed.
209: */
1.157 deraadt 210: /*ARGSUSED */
1.77 itojun 211: static void
1.11 markus 212: window_change_handler(int sig)
1.1 deraadt 213: {
1.11 markus 214: received_window_change_signal = 1;
215: signal(SIGWINCH, window_change_handler);
1.1 deraadt 216: }
217:
1.13 markus 218: /*
219: * Signal handler for signals that cause the program to terminate. These
220: * signals must be trapped to restore terminal modes.
221: */
1.157 deraadt 222: /*ARGSUSED */
1.77 itojun 223: static void
1.11 markus 224: signal_handler(int sig)
1.1 deraadt 225: {
1.75 markus 226: received_signal = sig;
227: quit_pending = 1;
1.1 deraadt 228: }
229:
1.13 markus 230: /*
231: * Returns current time in seconds from Jan 1, 1970 with the maximum
232: * available resolution.
233: */
1.1 deraadt 234:
1.77 itojun 235: static double
1.49 itojun 236: get_current_time(void)
1.1 deraadt 237: {
1.11 markus 238: struct timeval tv;
239: gettimeofday(&tv, NULL);
240: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 241: }
242:
243: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
244: void
245: client_x11_get_proto(const char *display, const char *xauth_path,
246: u_int trusted, char **_proto, char **_data)
247: {
248: char cmd[1024];
249: char line[512];
250: char xdisplay[512];
251: static char proto[512], data[512];
252: FILE *f;
253: int got_data = 0, generated = 0, do_unlink = 0, i;
254: char *xauthdir, *xauthfile;
255: struct stat st;
256:
257: xauthdir = xauthfile = NULL;
258: *_proto = proto;
259: *_data = data;
260: proto[0] = data[0] = '\0';
261:
262: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
263: debug("No xauth program.");
264: } else {
265: if (display == NULL) {
266: debug("x11_get_proto: DISPLAY not set");
267: return;
268: }
269: /*
270: * Handle FamilyLocal case where $DISPLAY does
271: * not match an authorization entry. For this we
272: * just try "xauth list unix:displaynum.screennum".
273: * XXX: "localhost" match to determine FamilyLocal
274: * is not perfect.
275: */
276: if (strncmp(display, "localhost:", 10) == 0) {
277: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
278: display + 10);
279: display = xdisplay;
280: }
281: if (trusted == 0) {
282: xauthdir = xmalloc(MAXPATHLEN);
283: xauthfile = xmalloc(MAXPATHLEN);
284: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
285: if (mkdtemp(xauthdir) != NULL) {
286: do_unlink = 1;
287: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
288: xauthdir);
289: snprintf(cmd, sizeof(cmd),
290: "%s -f %s generate %s " SSH_X11_PROTO
291: " untrusted timeout 1200 2>" _PATH_DEVNULL,
292: xauth_path, xauthfile, display);
293: debug2("x11_get_proto: %s", cmd);
294: if (system(cmd) == 0)
295: generated = 1;
296: }
297: }
1.181 markus 298:
299: /*
300: * When in untrusted mode, we read the cookie only if it was
301: * successfully generated as an untrusted one in the step
302: * above.
303: */
304: if (trusted || generated) {
305: snprintf(cmd, sizeof(cmd),
306: "%s %s%s list %s 2>" _PATH_DEVNULL,
307: xauth_path,
308: generated ? "-f " : "" ,
309: generated ? xauthfile : "",
310: display);
311: debug2("x11_get_proto: %s", cmd);
312: f = popen(cmd, "r");
313: if (f && fgets(line, sizeof(line), f) &&
314: sscanf(line, "%*s %511s %511s", proto, data) == 2)
315: got_data = 1;
316: if (f)
317: pclose(f);
318: } else
319: error("Warning: untrusted X11 forwarding setup failed: "
320: "xauth key data not generated");
1.138 djm 321: }
322:
323: if (do_unlink) {
324: unlink(xauthfile);
325: rmdir(xauthdir);
326: }
327: if (xauthdir)
328: xfree(xauthdir);
329: if (xauthfile)
330: xfree(xauthfile);
331:
332: /*
333: * If we didn't get authentication data, just make up some
334: * data. The forwarding code will check the validity of the
335: * response anyway, and substitute this data. The X11
336: * server, however, will ignore this fake data and use
337: * whatever authentication mechanisms it was using otherwise
338: * for the local connection.
339: */
340: if (!got_data) {
341: u_int32_t rnd = 0;
342:
343: logit("Warning: No xauth data; "
344: "using fake authentication data for X11 forwarding.");
345: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
346: for (i = 0; i < 16; i++) {
347: if (i % 4 == 0)
348: rnd = arc4random();
349: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
350: rnd & 0xff);
351: rnd >>= 8;
352: }
353: }
1.1 deraadt 354: }
355:
1.13 markus 356: /*
357: * This is called when the interactive is entered. This checks if there is
358: * an EOF coming on stdin. We must check this explicitly, as select() does
359: * not appear to wake up when redirecting from /dev/null.
360: */
1.1 deraadt 361:
1.77 itojun 362: static void
1.49 itojun 363: client_check_initial_eof_on_stdin(void)
1.1 deraadt 364: {
1.11 markus 365: int len;
366: char buf[1];
1.1 deraadt 367:
1.13 markus 368: /*
369: * If standard input is to be "redirected from /dev/null", we simply
370: * mark that we have seen an EOF and send an EOF message to the
371: * server. Otherwise, we try to read a single character; it appears
372: * that for some files, such /dev/null, select() never wakes up for
373: * read for this descriptor, which means that we never get EOF. This
374: * way we will get the EOF if stdin comes from /dev/null or similar.
375: */
1.11 markus 376: if (stdin_null_flag) {
377: /* Fake EOF on stdin. */
378: debug("Sending eof.");
379: stdin_eof = 1;
380: packet_start(SSH_CMSG_EOF);
381: packet_send();
382: } else {
383: enter_non_blocking();
384:
385: /* Check for immediate EOF on stdin. */
386: len = read(fileno(stdin), buf, 1);
387: if (len == 0) {
1.197 djm 388: /*
389: * EOF. Record that we have seen it and send
390: * EOF to server.
391: */
1.11 markus 392: debug("Sending eof.");
393: stdin_eof = 1;
394: packet_start(SSH_CMSG_EOF);
395: packet_send();
396: } else if (len > 0) {
1.13 markus 397: /*
398: * Got data. We must store the data in the buffer,
399: * and also process it as an escape character if
400: * appropriate.
401: */
1.195 djm 402: if ((u_char) buf[0] == escape_char1)
403: escape_pending1 = 1;
1.52 markus 404: else
1.11 markus 405: buffer_append(&stdin_buffer, buf, 1);
406: }
407: leave_non_blocking();
408: }
1.1 deraadt 409: }
410:
411:
1.13 markus 412: /*
413: * Make packets from buffered stdin data, and buffer them for sending to the
414: * connection.
415: */
1.1 deraadt 416:
1.77 itojun 417: static void
1.49 itojun 418: client_make_packets_from_stdin_data(void)
1.1 deraadt 419: {
1.42 markus 420: u_int len;
1.1 deraadt 421:
1.11 markus 422: /* Send buffered stdin data to the server. */
423: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 424: packet_not_very_much_data_to_write()) {
1.11 markus 425: len = buffer_len(&stdin_buffer);
426: /* Keep the packets at reasonable size. */
427: if (len > packet_get_maxsize())
428: len = packet_get_maxsize();
429: packet_start(SSH_CMSG_STDIN_DATA);
430: packet_put_string(buffer_ptr(&stdin_buffer), len);
431: packet_send();
432: buffer_consume(&stdin_buffer, len);
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:
1.210 andreas 489: packet_set_alive_timeouts(0);
1.117 markus 490: }
491:
492: static void
493: server_alive_check(void)
494: {
1.210 andreas 495: if (packet_inc_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: {
1.212 andreas 632: int len, cont = 0;
1.17 markus 633: char buf[8192];
1.11 markus 634:
1.13 markus 635: /*
636: * Read input from the server, and add any such data to the buffer of
637: * the packet subsystem.
638: */
1.11 markus 639: if (FD_ISSET(connection_in, readset)) {
640: /* Read as much as possible. */
1.212 andreas 641: len = roaming_read(connection_in, buf, sizeof(buf), &cont);
642: if (len == 0 && cont == 0) {
1.197 djm 643: /*
644: * Received EOF. The remote host has closed the
645: * connection.
646: */
647: snprintf(buf, sizeof buf,
648: "Connection to %.300s closed by remote host.\r\n",
649: host);
1.1 deraadt 650: buffer_append(&stderr_buffer, buf, strlen(buf));
651: quit_pending = 1;
652: return;
1.11 markus 653: }
1.13 markus 654: /*
655: * There is a kernel bug on Solaris that causes select to
656: * sometimes wake up even though there is no data available.
657: */
1.53 millert 658: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 659: len = 0;
660:
661: if (len < 0) {
1.197 djm 662: /*
663: * An error has encountered. Perhaps there is a
664: * network problem.
665: */
666: snprintf(buf, sizeof buf,
667: "Read from remote host %.300s: %.100s\r\n",
668: host, strerror(errno));
1.11 markus 669: buffer_append(&stderr_buffer, buf, strlen(buf));
670: quit_pending = 1;
671: return;
672: }
673: packet_process_incoming(buf, len);
674: }
1.17 markus 675: }
1.16 markus 676:
1.97 jakob 677: static void
1.190 djm 678: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 679: {
1.190 djm 680: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
681: char errmsg[256];
682: int tochan;
683:
684: /* XXX supress on mux _client_ quietmode */
685: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
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: {
1.201 djm 737: struct global_confirm *gc, *last_gc;
1.196 djm 738:
739: /* Coalesce identical callbacks */
1.201 djm 740: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
741: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
742: if (++last_gc->ref_count >= INT_MAX)
743: fatal("%s: last_gc->ref_count = %d",
744: __func__, last_gc->ref_count);
1.196 djm 745: return;
746: }
747:
748: gc = xmalloc(sizeof(*gc));
749: gc->cb = cb;
750: gc->ctx = ctx;
751: gc->ref_count = 1;
752: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 753: }
754:
755: static void
1.99 markus 756: process_cmdline(void)
1.97 jakob 757: {
758: void (*handler)(int);
1.135 djm 759: char *s, *cmd, *cancel_host;
1.121 djm 760: int delete = 0;
1.204 stevesk 761: int local = 0, remote = 0, dynamic = 0;
1.208 djm 762: int cancel_port;
1.135 djm 763: Forward fwd;
1.97 jakob 764:
1.183 djm 765: bzero(&fwd, sizeof(fwd));
766: fwd.listen_host = fwd.connect_host = NULL;
767:
1.97 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");
1.204 stevesk 786: logit(" -D[bind_address:]port "
787: "Request dynamic forward");
1.165 stevesk 788: logit(" -KR[bind_address:]port "
1.164 djm 789: "Cancel remote forward");
1.146 reyk 790: if (!options.permit_local_command)
791: goto out;
1.164 djm 792: logit(" !args "
793: "Execute local command");
1.146 reyk 794: goto out;
795: }
796:
797: if (*s == '!' && options.permit_local_command) {
798: s++;
799: ssh_local_cmd(s);
1.121 djm 800: goto out;
801: }
802:
803: if (*s == 'K') {
804: delete = 1;
805: s++;
806: }
1.204 stevesk 807: if (*s == 'L')
808: local = 1;
809: else if (*s == 'R')
810: remote = 1;
811: else if (*s == 'D')
812: dynamic = 1;
813: else {
1.109 itojun 814: logit("Invalid command.");
1.97 jakob 815: goto out;
816: }
1.204 stevesk 817:
818: if ((local || dynamic) && delete) {
1.121 djm 819: logit("Not supported.");
820: goto out;
821: }
1.204 stevesk 822: if (remote && delete && !compat20) {
1.109 itojun 823: logit("Not supported for SSH protocol version 1.");
1.97 jakob 824: goto out;
825: }
1.121 djm 826:
1.179 tedu 827: while (isspace(*++s))
828: ;
1.97 jakob 829:
1.121 djm 830: if (delete) {
1.135 djm 831: cancel_port = 0;
832: cancel_host = hpdelim(&s); /* may be NULL */
833: if (s != NULL) {
834: cancel_port = a2port(s);
835: cancel_host = cleanhostname(cancel_host);
836: } else {
837: cancel_port = a2port(cancel_host);
838: cancel_host = NULL;
1.121 djm 839: }
1.208 djm 840: if (cancel_port <= 0) {
1.135 djm 841: logit("Bad forwarding close port");
1.121 djm 842: goto out;
843: }
1.135 djm 844: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 845: } else {
1.209 djm 846: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 847: logit("Bad forwarding specification.");
848: goto out;
849: }
1.204 stevesk 850: if (local || dynamic) {
1.135 djm 851: if (channel_setup_local_fwd_listener(fwd.listen_host,
852: fwd.listen_port, fwd.connect_host,
853: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 854: logit("Port forwarding failed.");
855: goto out;
856: }
1.135 djm 857: } else {
1.167 markus 858: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 859: fwd.listen_port, fwd.connect_host,
1.167 markus 860: fwd.connect_port) < 0) {
861: logit("Port forwarding failed.");
862: goto out;
863: }
1.135 djm 864: }
865:
1.121 djm 866: logit("Forwarding port.");
867: }
868:
1.97 jakob 869: out:
870: signal(SIGINT, handler);
871: enter_raw_mode();
872: if (cmd)
873: xfree(cmd);
1.183 djm 874: if (fwd.listen_host != NULL)
875: xfree(fwd.listen_host);
876: if (fwd.connect_host != NULL)
877: xfree(fwd.connect_host);
1.97 jakob 878: }
879:
1.195 djm 880: /*
881: * Process the characters one by one, call with c==NULL for proto1 case.
882: */
1.77 itojun 883: static int
1.195 djm 884: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
885: char *buf, int len)
1.31 markus 886: {
1.32 markus 887: char string[1024];
1.31 markus 888: pid_t pid;
889: int bytes = 0;
1.42 markus 890: u_int i;
891: u_char ch;
1.31 markus 892: char *s;
1.195 djm 893: int *escape_pendingp, escape_char;
894: struct escape_filter_ctx *efc;
1.31 markus 895:
1.195 djm 896: if (c == NULL) {
897: escape_pendingp = &escape_pending1;
898: escape_char = escape_char1;
899: } else {
900: if (c->filter_ctx == NULL)
901: return 0;
902: efc = (struct escape_filter_ctx *)c->filter_ctx;
903: escape_pendingp = &efc->escape_pending;
904: escape_char = efc->escape_char;
905: }
906:
1.139 djm 907: if (len <= 0)
908: return (0);
909:
910: for (i = 0; i < (u_int)len; i++) {
1.31 markus 911: /* Get one character at a time. */
912: ch = buf[i];
913:
1.195 djm 914: if (*escape_pendingp) {
1.31 markus 915: /* We have previously seen an escape character. */
916: /* Clear the flag now. */
1.195 djm 917: *escape_pendingp = 0;
1.31 markus 918:
919: /* Process the escaped character. */
920: switch (ch) {
921: case '.':
922: /* Terminate the connection. */
1.195 djm 923: snprintf(string, sizeof string, "%c.\r\n",
924: escape_char);
1.32 markus 925: buffer_append(berr, string, strlen(string));
1.31 markus 926:
1.195 djm 927: if (c && c->ctl_fd != -1) {
928: chan_read_failed(c);
929: chan_write_failed(c);
930: return 0;
931: } else
932: quit_pending = 1;
1.31 markus 933: return -1;
934:
935: case 'Z' - 64:
1.195 djm 936: /* XXX support this for mux clients */
937: if (c && c->ctl_fd != -1) {
938: noescape:
939: snprintf(string, sizeof string,
940: "%c%c escape not available to "
941: "multiplexed sessions\r\n",
942: escape_char, ch);
943: buffer_append(berr, string,
944: strlen(string));
945: continue;
946: }
1.197 djm 947: /* Suspend the program. Inform the user */
1.195 djm 948: snprintf(string, sizeof string,
949: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 950: buffer_append(berr, string, strlen(string));
1.31 markus 951:
952: /* Restore terminal modes and suspend. */
953: client_suspend_self(bin, bout, berr);
954:
955: /* We have been continued. */
956: continue;
957:
1.111 markus 958: case 'B':
959: if (compat20) {
960: snprintf(string, sizeof string,
961: "%cB\r\n", escape_char);
962: buffer_append(berr, string,
963: strlen(string));
964: channel_request_start(session_ident,
965: "break", 0);
966: packet_put_int(1000);
967: packet_send();
968: }
969: continue;
970:
1.54 markus 971: case 'R':
1.59 markus 972: if (compat20) {
973: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 974: logit("Server does not "
975: "support re-keying");
1.59 markus 976: else
977: need_rekeying = 1;
978: }
1.54 markus 979: continue;
980:
1.31 markus 981: case '&':
1.195 djm 982: if (c && c->ctl_fd != -1)
983: goto noescape;
1.31 markus 984: /*
1.197 djm 985: * Detach the program (continue to serve
986: * connections, but put in background and no
987: * more new connections).
1.31 markus 988: */
989: /* Restore tty modes. */
990: leave_raw_mode();
991:
992: /* Stop listening for new connections. */
1.86 markus 993: channel_stop_listening();
1.31 markus 994:
1.86 markus 995: snprintf(string, sizeof string,
996: "%c& [backgrounded]\n", escape_char);
997: buffer_append(berr, string, strlen(string));
1.31 markus 998:
999: /* Fork into background. */
1000: pid = fork();
1001: if (pid < 0) {
1002: error("fork: %.100s", strerror(errno));
1003: continue;
1004: }
1005: if (pid != 0) { /* This is the parent. */
1006: /* The parent just exits. */
1007: exit(0);
1008: }
1009: /* The child continues serving connections. */
1.86 markus 1010: if (compat20) {
1011: buffer_append(bin, "\004", 1);
1012: /* fake EOF on stdin */
1013: return -1;
1014: } else if (!stdin_eof) {
1015: /*
1.197 djm 1016: * Sending SSH_CMSG_EOF alone does not
1017: * always appear to be enough. So we
1018: * try to send an EOF character first.
1.86 markus 1019: */
1020: packet_start(SSH_CMSG_STDIN_DATA);
1021: packet_put_string("\004", 1);
1022: packet_send();
1023: /* Close stdin. */
1024: stdin_eof = 1;
1025: if (buffer_len(bin) == 0) {
1026: packet_start(SSH_CMSG_EOF);
1027: packet_send();
1028: }
1029: }
1030: continue;
1.31 markus 1031:
1032: case '?':
1.195 djm 1033: if (c && c->ctl_fd != -1) {
1034: snprintf(string, sizeof string,
1035: "%c?\r\n\
1036: Supported escape sequences:\r\n\
1037: %c. - terminate session\r\n\
1038: %cB - send a BREAK to the remote system\r\n\
1039: %cR - Request rekey (SSH protocol 2 only)\r\n\
1040: %c# - list forwarded connections\r\n\
1041: %c? - this message\r\n\
1042: %c%c - send the escape character by typing it twice\r\n\
1043: (Note that escapes are only recognized immediately after newline.)\r\n",
1044: escape_char, escape_char,
1045: escape_char, escape_char,
1046: escape_char, escape_char,
1.206 djm 1047: escape_char, escape_char);
1.195 djm 1048: } else {
1049: snprintf(string, sizeof string,
1.31 markus 1050: "%c?\r\n\
1051: Supported escape sequences:\r\n\
1.195 djm 1052: %c. - terminate connection (and any multiplexed sessions)\r\n\
1053: %cB - send a BREAK to the remote system\r\n\
1054: %cC - open a command line\r\n\
1055: %cR - Request rekey (SSH protocol 2 only)\r\n\
1056: %c^Z - suspend ssh\r\n\
1057: %c# - list forwarded connections\r\n\
1058: %c& - background ssh (when waiting for connections to terminate)\r\n\
1059: %c? - this message\r\n\
1060: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1061: (Note that escapes are only recognized immediately after newline.)\r\n",
1.195 djm 1062: escape_char, escape_char,
1063: escape_char, escape_char,
1064: escape_char, escape_char,
1065: escape_char, escape_char,
1066: escape_char, escape_char,
1067: escape_char);
1068: }
1.32 markus 1069: buffer_append(berr, string, strlen(string));
1.31 markus 1070: continue;
1071:
1072: case '#':
1.195 djm 1073: snprintf(string, sizeof string, "%c#\r\n",
1074: escape_char);
1.32 markus 1075: buffer_append(berr, string, strlen(string));
1.31 markus 1076: s = channel_open_message();
1077: buffer_append(berr, s, strlen(s));
1078: xfree(s);
1.97 jakob 1079: continue;
1080:
1081: case 'C':
1.206 djm 1082: if (c && c->ctl_fd != -1)
1083: goto noescape;
1.99 markus 1084: process_cmdline();
1.31 markus 1085: continue;
1086:
1087: default:
1088: if (ch != escape_char) {
1089: buffer_put_char(bin, escape_char);
1090: bytes++;
1091: }
1092: /* Escaped characters fall through here */
1093: break;
1094: }
1095: } else {
1096: /*
1.197 djm 1097: * The previous character was not an escape char.
1098: * Check if this is an escape.
1.31 markus 1099: */
1100: if (last_was_cr && ch == escape_char) {
1.197 djm 1101: /*
1102: * It is. Set the flag and continue to
1103: * next character.
1104: */
1.195 djm 1105: *escape_pendingp = 1;
1.31 markus 1106: continue;
1107: }
1108: }
1109:
1110: /*
1111: * Normal character. Record whether it was a newline,
1112: * and append it to the buffer.
1113: */
1114: last_was_cr = (ch == '\r' || ch == '\n');
1115: buffer_put_char(bin, ch);
1116: bytes++;
1117: }
1118: return bytes;
1119: }
1120:
1.77 itojun 1121: static void
1.161 deraadt 1122: client_process_input(fd_set *readset)
1.17 markus 1123: {
1.21 deraadt 1124: int len;
1.31 markus 1125: char buf[8192];
1.16 markus 1126:
1.11 markus 1127: /* Read input from stdin. */
1128: if (FD_ISSET(fileno(stdin), readset)) {
1129: /* Read as much as possible. */
1130: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1131: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1132: return; /* we'll try again later */
1.11 markus 1133: if (len <= 0) {
1.13 markus 1134: /*
1135: * Received EOF or error. They are treated
1136: * similarly, except that an error message is printed
1137: * if it was an error condition.
1138: */
1.11 markus 1139: if (len < 0) {
1.197 djm 1140: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1141: strerror(errno));
1.11 markus 1142: buffer_append(&stderr_buffer, buf, strlen(buf));
1143: }
1144: /* Mark that we have seen EOF. */
1145: stdin_eof = 1;
1.13 markus 1146: /*
1147: * Send an EOF message to the server unless there is
1148: * data in the buffer. If there is data in the
1149: * buffer, no message will be sent now. Code
1150: * elsewhere will send the EOF when the buffer
1151: * becomes empty if stdin_eof is set.
1152: */
1.11 markus 1153: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1154: packet_start(SSH_CMSG_EOF);
1155: packet_send();
1.11 markus 1156: }
1.195 djm 1157: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1158: /*
1159: * Normal successful read, and no escape character.
1160: * Just append the data to buffer.
1161: */
1.11 markus 1162: buffer_append(&stdin_buffer, buf, len);
1163: } else {
1.13 markus 1164: /*
1.197 djm 1165: * Normal, successful read. But we have an escape
1166: * character and have to process the characters one
1167: * by one.
1.13 markus 1168: */
1.195 djm 1169: if (process_escapes(NULL, &stdin_buffer,
1170: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1171: return;
1.11 markus 1172: }
1173: }
1174: }
1175:
1.77 itojun 1176: static void
1.161 deraadt 1177: client_process_output(fd_set *writeset)
1.11 markus 1178: {
1179: int len;
1180: char buf[100];
1.1 deraadt 1181:
1.11 markus 1182: /* Write buffered output to stdout. */
1183: if (FD_ISSET(fileno(stdout), writeset)) {
1184: /* Write as much data as possible. */
1185: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1186: buffer_len(&stdout_buffer));
1.11 markus 1187: if (len <= 0) {
1.64 markus 1188: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1189: len = 0;
1190: else {
1.13 markus 1191: /*
1192: * An error or EOF was encountered. Put an
1193: * error message to stderr buffer.
1194: */
1.197 djm 1195: snprintf(buf, sizeof buf,
1196: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1197: buffer_append(&stderr_buffer, buf, strlen(buf));
1198: quit_pending = 1;
1199: return;
1200: }
1201: }
1202: /* Consume printed data from the buffer. */
1203: buffer_consume(&stdout_buffer, len);
1204: }
1205: /* Write buffered output to stderr. */
1206: if (FD_ISSET(fileno(stderr), writeset)) {
1207: /* Write as much data as possible. */
1208: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1209: buffer_len(&stderr_buffer));
1.11 markus 1210: if (len <= 0) {
1.64 markus 1211: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1212: len = 0;
1213: else {
1.197 djm 1214: /*
1215: * EOF or error, but can't even print
1216: * error message.
1217: */
1.11 markus 1218: quit_pending = 1;
1219: return;
1220: }
1221: }
1222: /* Consume printed characters from the buffer. */
1223: buffer_consume(&stderr_buffer, len);
1224: }
1.1 deraadt 1225: }
1226:
1.13 markus 1227: /*
1.15 markus 1228: * Get packets from the connection input buffer, and process them as long as
1229: * there are packets available.
1230: *
1231: * Any unknown packets received during the actual
1232: * session cause the session to terminate. This is
1233: * intended to make debugging easier since no
1234: * confirmations are sent. Any compatible protocol
1235: * extensions must be negotiated during the
1236: * preparatory phase.
1237: */
1238:
1.77 itojun 1239: static void
1.49 itojun 1240: client_process_buffered_input_packets(void)
1.15 markus 1241: {
1.197 djm 1242: dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1243: compat20 ? xxx_kex : NULL);
1.15 markus 1244: }
1245:
1.31 markus 1246: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1247:
1.195 djm 1248: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1249: void *
1250: client_new_escape_filter_ctx(int escape_char)
1251: {
1252: struct escape_filter_ctx *ret;
1253:
1254: ret = xmalloc(sizeof(*ret));
1255: ret->escape_pending = 0;
1256: ret->escape_char = escape_char;
1257: return (void *)ret;
1258: }
1259:
1.198 djm 1260: /* Free the escape filter context on channel free */
1261: void
1262: client_filter_cleanup(int cid, void *ctx)
1263: {
1264: xfree(ctx);
1265: }
1266:
1.195 djm 1267: int
1268: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1269: {
1.190 djm 1270: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1271: return 0;
1272:
1.195 djm 1273: return process_escapes(c, &c->input, &c->output, &c->extended,
1274: buf, len);
1.30 markus 1275: }
1276:
1.77 itojun 1277: static void
1.60 markus 1278: client_channel_closed(int id, void *arg)
1279: {
1.83 markus 1280: channel_cancel_cleanup(id);
1.60 markus 1281: session_closed = 1;
1.113 markus 1282: leave_raw_mode();
1.60 markus 1283: }
1284:
1.15 markus 1285: /*
1.13 markus 1286: * Implements the interactive session with the server. This is called after
1287: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1288: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1289: * used as an escape character for terminating or suspending the session.
1.13 markus 1290: */
1.1 deraadt 1291:
1.20 markus 1292: int
1.30 markus 1293: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1294: {
1.46 markus 1295: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1296: double start_time, total_time;
1.130 avsm 1297: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1.200 markus 1298: u_int64_t ibytes, obytes;
1.130 avsm 1299: u_int nalloc = 0;
1.11 markus 1300: char buf[100];
1301:
1302: debug("Entering interactive session.");
1303:
1304: start_time = get_current_time();
1305:
1306: /* Initialize variables. */
1.195 djm 1307: escape_pending1 = 0;
1.11 markus 1308: last_was_cr = 1;
1309: exit_status = -1;
1310: stdin_eof = 0;
1311: buffer_high = 64 * 1024;
1312: connection_in = packet_get_connection_in();
1313: connection_out = packet_get_connection_out();
1.46 markus 1314: max_fd = MAX(connection_in, connection_out);
1.192 djm 1315: if (muxserver_sock != -1)
1316: max_fd = MAX(max_fd, muxserver_sock);
1.46 markus 1317:
1318: if (!compat20) {
1.63 markus 1319: /* enable nonblocking unless tty */
1320: if (!isatty(fileno(stdin)))
1321: set_nonblock(fileno(stdin));
1322: if (!isatty(fileno(stdout)))
1323: set_nonblock(fileno(stdout));
1324: if (!isatty(fileno(stderr)))
1325: set_nonblock(fileno(stderr));
1.46 markus 1326: max_fd = MAX(max_fd, fileno(stdin));
1327: max_fd = MAX(max_fd, fileno(stdout));
1328: max_fd = MAX(max_fd, fileno(stderr));
1329: }
1.11 markus 1330: quit_pending = 0;
1.195 djm 1331: escape_char1 = escape_char_arg;
1.11 markus 1332:
1333: /* Initialize buffers. */
1334: buffer_init(&stdin_buffer);
1335: buffer_init(&stdout_buffer);
1336: buffer_init(&stderr_buffer);
1337:
1.15 markus 1338: client_init_dispatch();
1339:
1.105 markus 1340: /*
1341: * Set signal handlers, (e.g. to restore non-blocking mode)
1342: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1343: */
1.131 djm 1344: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1345: signal(SIGHUP, signal_handler);
1.105 markus 1346: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1347: signal(SIGINT, signal_handler);
1348: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1349: signal(SIGQUIT, signal_handler);
1350: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1351: signal(SIGTERM, signal_handler);
1.132 djm 1352: signal(SIGWINCH, window_change_handler);
1.11 markus 1353:
1354: if (have_pty)
1355: enter_raw_mode();
1356:
1.48 markus 1357: if (compat20) {
1358: session_ident = ssh2_chan_id;
1.195 djm 1359: if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1.48 markus 1360: channel_register_filter(session_ident,
1.195 djm 1361: client_simple_escape_filter, NULL,
1.198 djm 1362: client_filter_cleanup,
1.195 djm 1363: client_new_escape_filter_ctx(escape_char_arg));
1.60 markus 1364: if (session_ident != -1)
1365: channel_register_cleanup(session_ident,
1.143 djm 1366: client_channel_closed, 0);
1.48 markus 1367: } else {
1368: /* Check if we should immediately send eof on stdin. */
1.16 markus 1369: client_check_initial_eof_on_stdin();
1.48 markus 1370: }
1.30 markus 1371:
1.11 markus 1372: /* Main loop of the client for the interactive session mode. */
1373: while (!quit_pending) {
1374:
1.13 markus 1375: /* Process buffered packets sent by the server. */
1.11 markus 1376: client_process_buffered_input_packets();
1377:
1.60 markus 1378: if (compat20 && session_closed && !channel_still_open())
1379: break;
1380:
1.56 markus 1381: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1382:
1.56 markus 1383: if (rekeying) {
1384: debug("rekeying in progress");
1385: } else {
1386: /*
1387: * Make packets of buffered stdin data, and buffer
1388: * them for sending to the server.
1389: */
1390: if (!compat20)
1391: client_make_packets_from_stdin_data();
1.11 markus 1392:
1.56 markus 1393: /*
1394: * Make packets from buffered channel data, and
1395: * enqueue them for sending to the server.
1396: */
1397: if (packet_not_very_much_data_to_write())
1398: channel_output_poll();
1.11 markus 1399:
1.56 markus 1400: /*
1401: * Check if the window size has changed, and buffer a
1402: * message about it to the server if so.
1403: */
1404: client_check_window_change();
1.11 markus 1405:
1.56 markus 1406: if (quit_pending)
1407: break;
1408: }
1.13 markus 1409: /*
1410: * Wait until we have something to do (something becomes
1411: * available on one of the descriptors).
1412: */
1.81 markus 1413: max_fd2 = max_fd;
1.56 markus 1414: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1415: &max_fd2, &nalloc, rekeying);
1.11 markus 1416:
1417: if (quit_pending)
1418: break;
1419:
1.56 markus 1420: /* Do channel operations unless rekeying in progress. */
1421: if (!rekeying) {
1422: channel_after_select(readset, writeset);
1.108 markus 1423: if (need_rekeying || packet_need_rekeying()) {
1424: debug("need rekeying");
1.56 markus 1425: xxx_kex->done = 0;
1426: kex_send_kexinit(xxx_kex);
1427: need_rekeying = 0;
1428: }
1429: }
1.11 markus 1430:
1.17 markus 1431: /* Buffer input from the connection. */
1.46 markus 1432: client_process_net_input(readset);
1.17 markus 1433:
1.123 djm 1434: /* Accept control connections. */
1.192 djm 1435: if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1436: if (muxserver_accept_control())
1437: quit_pending = 1;
1438: }
1.123 djm 1439:
1.17 markus 1440: if (quit_pending)
1441: break;
1.11 markus 1442:
1.17 markus 1443: if (!compat20) {
1444: /* Buffer data from stdin */
1.46 markus 1445: client_process_input(readset);
1.17 markus 1446: /*
1447: * Process output to stdout and stderr. Output to
1448: * the connection is processed elsewhere (above).
1449: */
1.46 markus 1450: client_process_output(writeset);
1.214 andreas 1451: }
1452:
1453: if (session_resumed) {
1454: connection_in = packet_get_connection_in();
1455: connection_out = packet_get_connection_out();
1456: max_fd = MAX(max_fd, connection_out);
1457: max_fd = MAX(max_fd, connection_in);
1458: session_resumed = 0;
1.17 markus 1459: }
1.11 markus 1460:
1.197 djm 1461: /*
1462: * Send as much buffered packet data as possible to the
1463: * sender.
1464: */
1.46 markus 1465: if (FD_ISSET(connection_out, writeset))
1.11 markus 1466: packet_write_poll();
1467: }
1.46 markus 1468: if (readset)
1469: xfree(readset);
1470: if (writeset)
1471: xfree(writeset);
1.11 markus 1472:
1473: /* Terminate the session. */
1474:
1475: /* Stop watching for window change. */
1.132 djm 1476: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1477:
1.213 stevesk 1478: if (compat20) {
1479: packet_start(SSH2_MSG_DISCONNECT);
1480: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1481: packet_put_cstring("disconnected by user");
1482: packet_send();
1483: packet_write_wait();
1484: }
1.11 markus 1485:
1.76 markus 1486: channel_free_all();
1.11 markus 1487:
1.75 markus 1488: if (have_pty)
1489: leave_raw_mode();
1490:
1491: /* restore blocking io */
1492: if (!isatty(fileno(stdin)))
1493: unset_nonblock(fileno(stdin));
1494: if (!isatty(fileno(stdout)))
1495: unset_nonblock(fileno(stdout));
1496: if (!isatty(fileno(stderr)))
1497: unset_nonblock(fileno(stderr));
1.116 dtucker 1498:
1499: /*
1500: * If there was no shell or command requested, there will be no remote
1501: * exit status to be returned. In that case, clear error code if the
1502: * connection was deliberately terminated at this end.
1503: */
1504: if (no_shell_flag && received_signal == SIGTERM) {
1505: received_signal = 0;
1506: exit_status = 0;
1507: }
1.75 markus 1508:
1.113 markus 1509: if (received_signal)
1.89 itojun 1510: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1511:
1.13 markus 1512: /*
1513: * In interactive mode (with pseudo tty) display a message indicating
1514: * that the connection has been closed.
1515: */
1.11 markus 1516: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1517: snprintf(buf, sizeof buf,
1518: "Connection to %.64s closed.\r\n", host);
1.11 markus 1519: buffer_append(&stderr_buffer, buf, strlen(buf));
1520: }
1.70 markus 1521:
1.11 markus 1522: /* Output any buffered data for stdout. */
1.70 markus 1523: while (buffer_len(&stdout_buffer) > 0) {
1524: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1525: buffer_len(&stdout_buffer));
1.70 markus 1526: if (len <= 0) {
1.11 markus 1527: error("Write failed flushing stdout buffer.");
1.70 markus 1528: break;
1529: }
1.11 markus 1530: buffer_consume(&stdout_buffer, len);
1531: }
1532:
1533: /* Output any buffered data for stderr. */
1.70 markus 1534: while (buffer_len(&stderr_buffer) > 0) {
1535: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1536: buffer_len(&stderr_buffer));
1.70 markus 1537: if (len <= 0) {
1.11 markus 1538: error("Write failed flushing stderr buffer.");
1.70 markus 1539: break;
1540: }
1.11 markus 1541: buffer_consume(&stderr_buffer, len);
1542: }
1543:
1544: /* Clear and free any buffers. */
1545: memset(buf, 0, sizeof(buf));
1546: buffer_free(&stdin_buffer);
1547: buffer_free(&stdout_buffer);
1548: buffer_free(&stderr_buffer);
1549:
1550: /* Report bytes transferred, and transfer rates. */
1551: total_time = get_current_time() - start_time;
1.200 markus 1552: packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1553: packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1554: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1555: obytes, ibytes, total_time);
1.11 markus 1556: if (total_time > 0)
1.200 markus 1557: verbose("Bytes per second: sent %.1f, received %.1f",
1558: obytes / total_time, ibytes / total_time);
1.11 markus 1559: /* Return the exit status of the program. */
1560: debug("Exit status %d", exit_status);
1561: return exit_status;
1.15 markus 1562: }
1563:
1564: /*********/
1565:
1.77 itojun 1566: static void
1.94 markus 1567: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1568: {
1.42 markus 1569: u_int data_len;
1.15 markus 1570: char *data = packet_get_string(&data_len);
1.93 markus 1571: packet_check_eom();
1.15 markus 1572: buffer_append(&stdout_buffer, data, data_len);
1573: memset(data, 0, data_len);
1574: xfree(data);
1575: }
1.77 itojun 1576: static void
1.94 markus 1577: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1578: {
1.42 markus 1579: u_int data_len;
1.15 markus 1580: char *data = packet_get_string(&data_len);
1.93 markus 1581: packet_check_eom();
1.15 markus 1582: buffer_append(&stderr_buffer, data, data_len);
1583: memset(data, 0, data_len);
1584: xfree(data);
1585: }
1.77 itojun 1586: static void
1.94 markus 1587: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1588: {
1589: exit_status = packet_get_int();
1.93 markus 1590: packet_check_eom();
1.15 markus 1591: /* Acknowledge the exit. */
1592: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1593: packet_send();
1594: /*
1595: * Must wait for packet to be sent since we are
1596: * exiting the loop.
1597: */
1598: packet_write_wait();
1599: /* Flag that we want to exit. */
1600: quit_pending = 1;
1601: }
1.115 markus 1602: static void
1603: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1604: {
1605: Channel *c = NULL;
1606: int remote_id, sock;
1607:
1608: /* Read the remote channel number from the message. */
1609: remote_id = packet_get_int();
1610: packet_check_eom();
1611:
1612: /*
1613: * Get a connection to the local authentication agent (this may again
1614: * get forwarded).
1615: */
1616: sock = ssh_get_authentication_socket();
1617:
1618: /*
1619: * If we could not connect the agent, send an error message back to
1620: * the server. This should never happen unless the agent dies,
1621: * because authentication forwarding is only enabled if we have an
1622: * agent.
1623: */
1624: if (sock >= 0) {
1625: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1626: -1, 0, 0, 0, "authentication agent connection", 1);
1627: c->remote_id = remote_id;
1628: c->force_drain = 1;
1629: }
1630: if (c == NULL) {
1631: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1632: packet_put_int(remote_id);
1633: } else {
1634: /* Send a confirmation to the remote host. */
1635: debug("Forwarding authentication connection.");
1636: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1637: packet_put_int(remote_id);
1638: packet_put_int(c->self);
1639: }
1640: packet_send();
1641: }
1.15 markus 1642:
1.77 itojun 1643: static Channel *
1.40 markus 1644: client_request_forwarded_tcpip(const char *request_type, int rchan)
1645: {
1.103 deraadt 1646: Channel *c = NULL;
1.40 markus 1647: char *listen_address, *originator_address;
1.208 djm 1648: u_short listen_port, originator_port;
1.40 markus 1649:
1650: /* Get rest of the packet */
1651: listen_address = packet_get_string(NULL);
1652: listen_port = packet_get_int();
1653: originator_address = packet_get_string(NULL);
1654: originator_port = packet_get_int();
1.93 markus 1655: packet_check_eom();
1.40 markus 1656:
1.191 djm 1657: debug("client_request_forwarded_tcpip: listen %s port %d, "
1658: "originator %s port %d", listen_address, listen_port,
1659: originator_address, originator_port);
1660:
1661: c = channel_connect_by_listen_address(listen_port,
1662: "forwarded-tcpip", originator_address);
1.40 markus 1663:
1664: xfree(originator_address);
1665: xfree(listen_address);
1666: return c;
1667: }
1668:
1.103 deraadt 1669: static Channel *
1.40 markus 1670: client_request_x11(const char *request_type, int rchan)
1671: {
1672: Channel *c = NULL;
1673: char *originator;
1.208 djm 1674: u_short originator_port;
1.67 markus 1675: int sock;
1.40 markus 1676:
1677: if (!options.forward_x11) {
1678: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1679: error("Warning: this is probably a break-in attempt by a "
1680: "malicious server.");
1.40 markus 1681: return NULL;
1682: }
1683: originator = packet_get_string(NULL);
1684: if (datafellows & SSH_BUG_X11FWD) {
1685: debug2("buggy server: x11 request w/o originator_port");
1686: originator_port = 0;
1687: } else {
1688: originator_port = packet_get_int();
1689: }
1.93 markus 1690: packet_check_eom();
1.40 markus 1691: /* XXX check permission */
1.47 markus 1692: debug("client_request_x11: request from %s %d", originator,
1693: originator_port);
1.67 markus 1694: xfree(originator);
1.40 markus 1695: sock = x11_connect_display();
1.67 markus 1696: if (sock < 0)
1697: return NULL;
1698: c = channel_new("x11",
1699: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1700: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1701: c->force_drain = 1;
1.40 markus 1702: return c;
1703: }
1704:
1.103 deraadt 1705: static Channel *
1.40 markus 1706: client_request_agent(const char *request_type, int rchan)
1707: {
1708: Channel *c = NULL;
1.67 markus 1709: int sock;
1.40 markus 1710:
1711: if (!options.forward_agent) {
1712: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1713: error("Warning: this is probably a break-in attempt by a "
1714: "malicious server.");
1.40 markus 1715: return NULL;
1716: }
1.177 stevesk 1717: sock = ssh_get_authentication_socket();
1.67 markus 1718: if (sock < 0)
1719: return NULL;
1720: c = channel_new("authentication agent connection",
1721: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1722: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1723: "authentication agent connection", 1);
1.82 markus 1724: c->force_drain = 1;
1.40 markus 1725: return c;
1.180 djm 1726: }
1727:
1728: int
1729: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1730: {
1731: Channel *c;
1732: int fd;
1733:
1734: if (tun_mode == SSH_TUNMODE_NO)
1735: return 0;
1736:
1737: if (!compat20) {
1.207 stevesk 1738: error("Tunnel forwarding is not supported for protocol 1");
1.180 djm 1739: return -1;
1740: }
1741:
1742: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1743:
1744: /* Open local tunnel device */
1745: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1746: error("Tunnel device open failed.");
1747: return -1;
1748: }
1749:
1750: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1751: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1752: c->datagram = 1;
1753:
1754: packet_start(SSH2_MSG_CHANNEL_OPEN);
1755: packet_put_cstring("tun@openssh.com");
1756: packet_put_int(c->self);
1757: packet_put_int(c->local_window_max);
1758: packet_put_int(c->local_maxpacket);
1759: packet_put_int(tun_mode);
1760: packet_put_int(remote_tun);
1761: packet_send();
1762:
1763: return 0;
1.40 markus 1764: }
1765:
1.22 markus 1766: /* XXXX move to generic input handler */
1.77 itojun 1767: static void
1.94 markus 1768: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1769: {
1770: Channel *c = NULL;
1771: char *ctype;
1772: int rchan;
1.102 markus 1773: u_int rmaxpack, rwindow, len;
1.22 markus 1774:
1775: ctype = packet_get_string(&len);
1776: rchan = packet_get_int();
1777: rwindow = packet_get_int();
1778: rmaxpack = packet_get_int();
1779:
1.24 markus 1780: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1781: ctype, rchan, rwindow, rmaxpack);
1782:
1.40 markus 1783: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1784: c = client_request_forwarded_tcpip(ctype, rchan);
1785: } else if (strcmp(ctype, "x11") == 0) {
1786: c = client_request_x11(ctype, rchan);
1787: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1788: c = client_request_agent(ctype, rchan);
1.22 markus 1789: }
1790: /* XXX duplicate : */
1791: if (c != NULL) {
1792: debug("confirm %s", ctype);
1793: c->remote_id = rchan;
1794: c->remote_window = rwindow;
1795: c->remote_maxpacket = rmaxpack;
1.69 markus 1796: if (c->type != SSH_CHANNEL_CONNECTING) {
1797: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1798: packet_put_int(c->remote_id);
1799: packet_put_int(c->self);
1800: packet_put_int(c->local_window);
1801: packet_put_int(c->local_maxpacket);
1802: packet_send();
1803: }
1.22 markus 1804: } else {
1805: debug("failure %s", ctype);
1806: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1807: packet_put_int(rchan);
1808: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1809: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1810: packet_put_cstring("open failed");
1.66 markus 1811: packet_put_cstring("");
1812: }
1.22 markus 1813: packet_send();
1814: }
1815: xfree(ctype);
1816: }
1.77 itojun 1817: static void
1.94 markus 1818: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1819: {
1820: Channel *c = NULL;
1.123 djm 1821: int exitval, id, reply, success = 0;
1.48 markus 1822: char *rtype;
1823:
1824: id = packet_get_int();
1825: rtype = packet_get_string(NULL);
1826: reply = packet_get_char();
1827:
1828: debug("client_input_channel_req: channel %d rtype %s reply %d",
1829: id, rtype, reply);
1830:
1.128 djm 1831: if (id == -1) {
1832: error("client_input_channel_req: request for channel -1");
1833: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 1834: error("client_input_channel_req: channel %d: "
1835: "unknown channel", id);
1.193 markus 1836: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1837: packet_check_eom();
1838: chan_rcvd_eow(c);
1.48 markus 1839: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1840: exitval = packet_get_int();
1.215 ! djm 1841: if (c->ctl_fd != -1) {
! 1842: /* Dispatch to mux client */
! 1843: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
! 1844: success = 1;
! 1845: } else if (id == session_ident) {
! 1846: /* Record exit value of local session */
1.123 djm 1847: success = 1;
1848: exit_status = exitval;
1.215 ! djm 1849: } else {
1.123 djm 1850: error("client_input_channel_req: unexpected channel %d",
1851: session_ident);
1852: }
1.93 markus 1853: packet_check_eom();
1.48 markus 1854: }
1855: if (reply) {
1856: packet_start(success ?
1857: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 1858: packet_put_int(c->remote_id);
1.48 markus 1859: packet_send();
1860: }
1861: xfree(rtype);
1862: }
1.95 markus 1863: static void
1864: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1865: {
1866: char *rtype;
1867: int want_reply;
1868: int success = 0;
1869:
1870: rtype = packet_get_string(NULL);
1871: want_reply = packet_get_char();
1.117 markus 1872: debug("client_input_global_request: rtype %s want_reply %d",
1873: rtype, want_reply);
1.95 markus 1874: if (want_reply) {
1875: packet_start(success ?
1876: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1877: packet_send();
1878: packet_write_wait();
1879: }
1880: xfree(rtype);
1881: }
1.22 markus 1882:
1.123 djm 1883: void
1.129 deraadt 1884: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 1885: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 1886: {
1887: int len;
1.132 djm 1888: Channel *c = NULL;
1.123 djm 1889:
1890: debug2("%s: id %d", __func__, id);
1891:
1.132 djm 1892: if ((c = channel_lookup(id)) == NULL)
1893: fatal("client_session2_setup: channel %d: unknown channel", id);
1894:
1.123 djm 1895: if (want_tty) {
1896: struct winsize ws;
1897:
1898: /* Store window size in the packet. */
1899: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1900: memset(&ws, 0, sizeof(ws));
1901:
1.190 djm 1902: channel_request_start(id, "pty-req", 1);
1903: client_expect_confirm(id, "PTY allocation", 0);
1.123 djm 1904: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1905: packet_put_int((u_int)ws.ws_col);
1906: packet_put_int((u_int)ws.ws_row);
1907: packet_put_int((u_int)ws.ws_xpixel);
1908: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 1909: if (tiop == NULL)
1910: tiop = get_saved_tio();
1911: tty_make_modes(-1, tiop);
1.123 djm 1912: packet_send();
1913: /* XXX wait for reply */
1.132 djm 1914: c->client_tty = 1;
1.123 djm 1915: }
1916:
1917: /* Transfer any environment variables from client to server */
1.126 djm 1918: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1919: int i, j, matched;
1920: char *name, *val;
1921:
1922: debug("Sending environment.");
1.126 djm 1923: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1924: /* Split */
1.126 djm 1925: name = xstrdup(env[i]);
1.123 djm 1926: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1927: xfree(name);
1.123 djm 1928: continue;
1929: }
1930: *val++ = '\0';
1931:
1932: matched = 0;
1933: for (j = 0; j < options.num_send_env; j++) {
1934: if (match_pattern(name, options.send_env[j])) {
1935: matched = 1;
1936: break;
1937: }
1938: }
1939: if (!matched) {
1940: debug3("Ignored env %s", name);
1.144 stevesk 1941: xfree(name);
1.123 djm 1942: continue;
1943: }
1944:
1945: debug("Sending env %s = %s", name, val);
1946: channel_request_start(id, "env", 0);
1947: packet_put_cstring(name);
1948: packet_put_cstring(val);
1949: packet_send();
1.144 stevesk 1950: xfree(name);
1.123 djm 1951: }
1952: }
1953:
1954: len = buffer_len(cmd);
1955: if (len > 0) {
1956: if (len > 900)
1957: len = 900;
1958: if (want_subsystem) {
1.190 djm 1959: debug("Sending subsystem: %.*s",
1960: len, (u_char*)buffer_ptr(cmd));
1961: channel_request_start(id, "subsystem", 1);
1962: client_expect_confirm(id, "subsystem", 1);
1.123 djm 1963: } else {
1.190 djm 1964: debug("Sending command: %.*s",
1965: len, (u_char*)buffer_ptr(cmd));
1966: channel_request_start(id, "exec", 1);
1967: client_expect_confirm(id, "exec", 1);
1.123 djm 1968: }
1969: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1970: packet_send();
1971: } else {
1.190 djm 1972: channel_request_start(id, "shell", 1);
1973: client_expect_confirm(id, "shell", 1);
1.123 djm 1974: packet_send();
1975: }
1976: }
1977:
1.77 itojun 1978: static void
1.49 itojun 1979: client_init_dispatch_20(void)
1.16 markus 1980: {
1.55 markus 1981: dispatch_init(&dispatch_protocol_error);
1.100 markus 1982:
1.16 markus 1983: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1984: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1985: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1986: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1987: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1988: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1989: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1990: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1991: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 1992: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
1993: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 1994: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1995:
1996: /* rekeying */
1997: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1998:
1999: /* global request reply messages */
2000: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2001: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2002: }
1.197 djm 2003:
1.77 itojun 2004: static void
1.49 itojun 2005: client_init_dispatch_13(void)
1.15 markus 2006: {
2007: dispatch_init(NULL);
2008: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2009: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2010: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2011: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2012: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2013: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2014: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2015: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2016: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2017:
2018: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2019: &client_input_agent_open : &deny_input_open);
1.39 markus 2020: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2021: &x11_input_open : &deny_input_open);
1.15 markus 2022: }
1.197 djm 2023:
1.77 itojun 2024: static void
1.49 itojun 2025: client_init_dispatch_15(void)
1.15 markus 2026: {
2027: client_init_dispatch_13();
2028: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2029: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2030: }
1.197 djm 2031:
1.79 stevesk 2032: static void
1.49 itojun 2033: client_init_dispatch(void)
1.15 markus 2034: {
1.16 markus 2035: if (compat20)
2036: client_init_dispatch_20();
2037: else if (compat13)
1.15 markus 2038: client_init_dispatch_13();
2039: else
2040: client_init_dispatch_15();
1.113 markus 2041: }
2042:
2043: /* client specific fatal cleanup */
2044: void
1.114 markus 2045: cleanup_exit(int i)
1.113 markus 2046: {
2047: leave_raw_mode();
2048: leave_non_blocking();
1.192 djm 2049: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2050: unlink(options.control_path);
1.114 markus 2051: _exit(i);
1.1 deraadt 2052: }
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