Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.201
1.201 ! djm 1: /* $OpenBSD: clientloop.c,v 1.200 2008/07/10 18:08:11 markus Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.172 stevesk 68: #include <sys/param.h>
1.189 djm 69: #include <sys/queue.h>
1.150 stevesk 70:
1.155 stevesk 71: #include <ctype.h>
1.168 stevesk 72: #include <errno.h>
1.151 stevesk 73: #include <paths.h>
1.153 stevesk 74: #include <signal.h>
1.174 stevesk 75: #include <stdio.h>
1.173 stevesk 76: #include <stdlib.h>
1.170 stevesk 77: #include <string.h>
1.150 stevesk 78: #include <termios.h>
1.175 deraadt 79: #include <pwd.h>
1.169 stevesk 80: #include <unistd.h>
1.1 deraadt 81:
1.175 deraadt 82: #include "xmalloc.h"
1.45 markus 83: #include "ssh.h"
84: #include "ssh1.h"
85: #include "ssh2.h"
1.1 deraadt 86: #include "packet.h"
87: #include "buffer.h"
1.15 markus 88: #include "compat.h"
1.74 markus 89: #include "channels.h"
1.15 markus 90: #include "dispatch.h"
1.40 markus 91: #include "key.h"
1.175 deraadt 92: #include "cipher.h"
1.54 markus 93: #include "kex.h"
1.45 markus 94: #include "log.h"
95: #include "readconf.h"
96: #include "clientloop.h"
1.147 djm 97: #include "sshconnect.h"
1.40 markus 98: #include "authfd.h"
1.45 markus 99: #include "atomicio.h"
1.118 deraadt 100: #include "sshpty.h"
1.63 markus 101: #include "misc.h"
1.123 djm 102: #include "monitor_fdpass.h"
103: #include "match.h"
104: #include "msg.h"
1.39 markus 105:
106: /* import options */
107: extern Options options;
108:
1.1 deraadt 109: /* Flag indicating that stdin should be redirected from /dev/null. */
110: extern int stdin_null_flag;
111:
1.116 dtucker 112: /* Flag indicating that no shell has been requested */
113: extern int no_shell_flag;
114:
1.123 djm 115: /* Control socket */
1.192 djm 116: extern int muxserver_sock;
1.123 djm 117:
1.13 markus 118: /*
119: * Name of the host we are connecting to. This is the name given on the
120: * command line, or the HostName specified for the user-supplied name in a
121: * configuration file.
122: */
1.1 deraadt 123: extern char *host;
124:
1.13 markus 125: /*
126: * Flag to indicate that we have received a window change signal which has
127: * not yet been processed. This will cause a message indicating the new
128: * window size to be sent to the server a little later. This is volatile
129: * because this is updated in a signal handler.
130: */
1.88 markus 131: static volatile sig_atomic_t received_window_change_signal = 0;
132: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 133:
1.145 djm 134: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 135: static int in_non_blocking_mode = 0;
136:
137: /* Common data for the client loop code. */
1.162 djm 138: static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.195 djm 139: static int escape_char1; /* Escape character. (proto1 only) */
140: static int escape_pending1; /* Last character was an escape (proto1 only) */
1.11 markus 141: static int last_was_cr; /* Last character was a newline. */
1.197 djm 142: static int exit_status; /* Used to store the command exit status. */
143: static int stdin_eof; /* EOF has been encountered on stderr. */
1.11 markus 144: static Buffer stdin_buffer; /* Buffer for stdin data. */
145: static Buffer stdout_buffer; /* Buffer for stdout data. */
146: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 147: static u_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:
1.195 djm 156: /* Track escape per proto2 channel */
157: struct escape_filter_ctx {
158: int escape_pending;
159: int escape_char;
160: };
161:
162: /* Context for channel confirmation replies */
1.190 djm 163: struct channel_reply_ctx {
164: const char *request_type;
165: int id, do_close;
166: };
167:
1.196 djm 168: /* Global request success/failure callbacks */
169: struct global_confirm {
170: TAILQ_ENTRY(global_confirm) entry;
171: global_confirm_cb *cb;
172: void *ctx;
173: int ref_count;
174: };
175: TAILQ_HEAD(global_confirms, global_confirm);
176: static struct global_confirms global_confirms =
177: TAILQ_HEAD_INITIALIZER(global_confirms);
178:
1.54 markus 179: /*XXX*/
180: extern Kex *xxx_kex;
181:
1.123 djm 182: void ssh_process_session2_setup(int, int, int, Buffer *);
183:
1.1 deraadt 184: /* Restores stdin to blocking mode. */
185:
1.77 itojun 186: static void
1.49 itojun 187: leave_non_blocking(void)
1.1 deraadt 188: {
1.11 markus 189: if (in_non_blocking_mode) {
1.125 djm 190: unset_nonblock(fileno(stdin));
1.11 markus 191: in_non_blocking_mode = 0;
192: }
1.1 deraadt 193: }
194:
1.11 markus 195: /* Puts stdin terminal in non-blocking mode. */
196:
1.77 itojun 197: static void
1.49 itojun 198: enter_non_blocking(void)
1.1 deraadt 199: {
1.11 markus 200: in_non_blocking_mode = 1;
1.124 djm 201: set_nonblock(fileno(stdin));
1.1 deraadt 202: }
203:
1.13 markus 204: /*
205: * Signal handler for the window change signal (SIGWINCH). This just sets a
206: * flag indicating that the window has changed.
207: */
1.157 deraadt 208: /*ARGSUSED */
1.77 itojun 209: static void
1.11 markus 210: window_change_handler(int sig)
1.1 deraadt 211: {
1.11 markus 212: received_window_change_signal = 1;
213: signal(SIGWINCH, window_change_handler);
1.1 deraadt 214: }
215:
1.13 markus 216: /*
217: * Signal handler for signals that cause the program to terminate. These
218: * signals must be trapped to restore terminal modes.
219: */
1.157 deraadt 220: /*ARGSUSED */
1.77 itojun 221: static void
1.11 markus 222: signal_handler(int sig)
1.1 deraadt 223: {
1.75 markus 224: received_signal = sig;
225: quit_pending = 1;
1.1 deraadt 226: }
227:
1.13 markus 228: /*
229: * Returns current time in seconds from Jan 1, 1970 with the maximum
230: * available resolution.
231: */
1.1 deraadt 232:
1.77 itojun 233: static double
1.49 itojun 234: get_current_time(void)
1.1 deraadt 235: {
1.11 markus 236: struct timeval tv;
237: gettimeofday(&tv, NULL);
238: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 239: }
240:
241: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
242: void
243: client_x11_get_proto(const char *display, const char *xauth_path,
244: u_int trusted, char **_proto, char **_data)
245: {
246: char cmd[1024];
247: char line[512];
248: char xdisplay[512];
249: static char proto[512], data[512];
250: FILE *f;
251: int got_data = 0, generated = 0, do_unlink = 0, i;
252: char *xauthdir, *xauthfile;
253: struct stat st;
254:
255: xauthdir = xauthfile = NULL;
256: *_proto = proto;
257: *_data = data;
258: proto[0] = data[0] = '\0';
259:
260: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
261: debug("No xauth program.");
262: } else {
263: if (display == NULL) {
264: debug("x11_get_proto: DISPLAY not set");
265: return;
266: }
267: /*
268: * Handle FamilyLocal case where $DISPLAY does
269: * not match an authorization entry. For this we
270: * just try "xauth list unix:displaynum.screennum".
271: * XXX: "localhost" match to determine FamilyLocal
272: * is not perfect.
273: */
274: if (strncmp(display, "localhost:", 10) == 0) {
275: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
276: display + 10);
277: display = xdisplay;
278: }
279: if (trusted == 0) {
280: xauthdir = xmalloc(MAXPATHLEN);
281: xauthfile = xmalloc(MAXPATHLEN);
282: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
283: if (mkdtemp(xauthdir) != NULL) {
284: do_unlink = 1;
285: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
286: xauthdir);
287: snprintf(cmd, sizeof(cmd),
288: "%s -f %s generate %s " SSH_X11_PROTO
289: " untrusted timeout 1200 2>" _PATH_DEVNULL,
290: xauth_path, xauthfile, display);
291: debug2("x11_get_proto: %s", cmd);
292: if (system(cmd) == 0)
293: generated = 1;
294: }
295: }
1.181 markus 296:
297: /*
298: * When in untrusted mode, we read the cookie only if it was
299: * successfully generated as an untrusted one in the step
300: * above.
301: */
302: if (trusted || generated) {
303: snprintf(cmd, sizeof(cmd),
304: "%s %s%s list %s 2>" _PATH_DEVNULL,
305: xauth_path,
306: generated ? "-f " : "" ,
307: generated ? xauthfile : "",
308: display);
309: debug2("x11_get_proto: %s", cmd);
310: f = popen(cmd, "r");
311: if (f && fgets(line, sizeof(line), f) &&
312: sscanf(line, "%*s %511s %511s", proto, data) == 2)
313: got_data = 1;
314: if (f)
315: pclose(f);
316: } else
317: error("Warning: untrusted X11 forwarding setup failed: "
318: "xauth key data not generated");
1.138 djm 319: }
320:
321: if (do_unlink) {
322: unlink(xauthfile);
323: rmdir(xauthdir);
324: }
325: if (xauthdir)
326: xfree(xauthdir);
327: if (xauthfile)
328: xfree(xauthfile);
329:
330: /*
331: * If we didn't get authentication data, just make up some
332: * data. The forwarding code will check the validity of the
333: * response anyway, and substitute this data. The X11
334: * server, however, will ignore this fake data and use
335: * whatever authentication mechanisms it was using otherwise
336: * for the local connection.
337: */
338: if (!got_data) {
339: u_int32_t rnd = 0;
340:
341: logit("Warning: No xauth data; "
342: "using fake authentication data for X11 forwarding.");
343: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
344: for (i = 0; i < 16; i++) {
345: if (i % 4 == 0)
346: rnd = arc4random();
347: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
348: rnd & 0xff);
349: rnd >>= 8;
350: }
351: }
1.1 deraadt 352: }
353:
1.13 markus 354: /*
355: * This is called when the interactive is entered. This checks if there is
356: * an EOF coming on stdin. We must check this explicitly, as select() does
357: * not appear to wake up when redirecting from /dev/null.
358: */
1.1 deraadt 359:
1.77 itojun 360: static void
1.49 itojun 361: client_check_initial_eof_on_stdin(void)
1.1 deraadt 362: {
1.11 markus 363: int len;
364: char buf[1];
1.1 deraadt 365:
1.13 markus 366: /*
367: * If standard input is to be "redirected from /dev/null", we simply
368: * mark that we have seen an EOF and send an EOF message to the
369: * server. Otherwise, we try to read a single character; it appears
370: * that for some files, such /dev/null, select() never wakes up for
371: * read for this descriptor, which means that we never get EOF. This
372: * way we will get the EOF if stdin comes from /dev/null or similar.
373: */
1.11 markus 374: if (stdin_null_flag) {
375: /* Fake EOF on stdin. */
376: debug("Sending eof.");
377: stdin_eof = 1;
378: packet_start(SSH_CMSG_EOF);
379: packet_send();
380: } else {
381: enter_non_blocking();
382:
383: /* Check for immediate EOF on stdin. */
384: len = read(fileno(stdin), buf, 1);
385: if (len == 0) {
1.197 djm 386: /*
387: * EOF. Record that we have seen it and send
388: * EOF to server.
389: */
1.11 markus 390: debug("Sending eof.");
391: stdin_eof = 1;
392: packet_start(SSH_CMSG_EOF);
393: packet_send();
394: } else if (len > 0) {
1.13 markus 395: /*
396: * Got data. We must store the data in the buffer,
397: * and also process it as an escape character if
398: * appropriate.
399: */
1.195 djm 400: if ((u_char) buf[0] == escape_char1)
401: escape_pending1 = 1;
1.52 markus 402: else
1.11 markus 403: buffer_append(&stdin_buffer, buf, 1);
404: }
405: leave_non_blocking();
406: }
1.1 deraadt 407: }
408:
409:
1.13 markus 410: /*
411: * Make packets from buffered stdin data, and buffer them for sending to the
412: * connection.
413: */
1.1 deraadt 414:
1.77 itojun 415: static void
1.49 itojun 416: client_make_packets_from_stdin_data(void)
1.1 deraadt 417: {
1.42 markus 418: u_int len;
1.1 deraadt 419:
1.11 markus 420: /* Send buffered stdin data to the server. */
421: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 422: packet_not_very_much_data_to_write()) {
1.11 markus 423: len = buffer_len(&stdin_buffer);
424: /* Keep the packets at reasonable size. */
425: if (len > packet_get_maxsize())
426: len = packet_get_maxsize();
427: packet_start(SSH_CMSG_STDIN_DATA);
428: packet_put_string(buffer_ptr(&stdin_buffer), len);
429: packet_send();
430: buffer_consume(&stdin_buffer, len);
431: /* If we have a pending EOF, send it now. */
432: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
433: packet_start(SSH_CMSG_EOF);
434: packet_send();
435: }
1.1 deraadt 436: }
437: }
438:
1.13 markus 439: /*
440: * Checks if the client window has changed, and sends a packet about it to
441: * the server if so. The actual change is detected elsewhere (by a software
442: * interrupt on Unix); this just checks the flag and sends a message if
443: * appropriate.
444: */
1.1 deraadt 445:
1.77 itojun 446: static void
1.49 itojun 447: client_check_window_change(void)
1.1 deraadt 448: {
1.16 markus 449: struct winsize ws;
450:
451: if (! received_window_change_signal)
452: return;
453: /** XXX race */
454: received_window_change_signal = 0;
455:
1.37 markus 456: debug2("client_check_window_change: changed");
1.16 markus 457:
458: if (compat20) {
1.123 djm 459: channel_send_window_changes();
1.16 markus 460: } else {
1.123 djm 461: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
462: return;
1.16 markus 463: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 464: packet_put_int((u_int)ws.ws_row);
465: packet_put_int((u_int)ws.ws_col);
466: packet_put_int((u_int)ws.ws_xpixel);
467: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 468: packet_send();
1.1 deraadt 469: }
470: }
471:
1.117 markus 472: static void
473: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
474: {
1.196 djm 475: struct global_confirm *gc;
476:
477: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
478: return;
479: if (gc->cb != NULL)
480: gc->cb(type, seq, gc->ctx);
481: if (--gc->ref_count <= 0) {
482: TAILQ_REMOVE(&global_confirms, gc, entry);
483: bzero(gc, sizeof(*gc));
484: xfree(gc);
485: }
486:
1.188 dtucker 487: keep_alive_timeouts = 0;
1.117 markus 488: }
489:
490: static void
491: server_alive_check(void)
492: {
1.188 dtucker 493: if (++keep_alive_timeouts > options.server_alive_count_max) {
1.176 markus 494: logit("Timeout, server not responding.");
495: cleanup_exit(255);
496: }
1.117 markus 497: packet_start(SSH2_MSG_GLOBAL_REQUEST);
498: packet_put_cstring("keepalive@openssh.com");
499: packet_put_char(1); /* boolean: want reply */
500: packet_send();
1.196 djm 501: /* Insert an empty placeholder to maintain ordering */
502: client_register_global_confirm(NULL, NULL);
1.117 markus 503: }
504:
1.13 markus 505: /*
506: * Waits until the client can do something (some data becomes available on
507: * one of the file descriptors).
508: */
1.77 itojun 509: static void
1.46 markus 510: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 511: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 512: {
1.117 markus 513: struct timeval tv, *tvp;
514: int ret;
515:
1.46 markus 516: /* Add any selections by the channel mechanism. */
1.81 markus 517: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 518:
1.16 markus 519: if (!compat20) {
1.17 markus 520: /* Read from the connection, unless our buffers are full. */
1.16 markus 521: if (buffer_len(&stdout_buffer) < buffer_high &&
522: buffer_len(&stderr_buffer) < buffer_high &&
523: channel_not_very_much_buffered_data())
1.46 markus 524: FD_SET(connection_in, *readsetp);
1.17 markus 525: /*
526: * Read from stdin, unless we have seen EOF or have very much
527: * buffered data to send to the server.
528: */
529: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 530: FD_SET(fileno(stdin), *readsetp);
1.17 markus 531:
532: /* Select stdout/stderr if have data in buffer. */
533: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 534: FD_SET(fileno(stdout), *writesetp);
1.17 markus 535: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 536: FD_SET(fileno(stderr), *writesetp);
1.16 markus 537: } else {
1.71 markus 538: /* channel_prepare_select could have closed the last channel */
1.84 markus 539: if (session_closed && !channel_still_open() &&
540: !packet_have_data_to_write()) {
541: /* clear mask since we did not call select() */
1.87 markus 542: memset(*readsetp, 0, *nallocp);
543: memset(*writesetp, 0, *nallocp);
1.84 markus 544: return;
1.71 markus 545: } else {
546: FD_SET(connection_in, *readsetp);
547: }
1.16 markus 548: }
1.11 markus 549:
550: /* Select server connection if have data to write to the server. */
551: if (packet_have_data_to_write())
1.46 markus 552: FD_SET(connection_out, *writesetp);
1.11 markus 553:
1.192 djm 554: if (muxserver_sock != -1)
555: FD_SET(muxserver_sock, *readsetp);
1.123 djm 556:
1.13 markus 557: /*
558: * Wait for something to happen. This will suspend the process until
559: * some selected descriptor can be read, written, or has some other
1.117 markus 560: * event pending.
1.13 markus 561: */
1.11 markus 562:
1.117 markus 563: if (options.server_alive_interval == 0 || !compat20)
564: tvp = NULL;
1.129 deraadt 565: else {
1.117 markus 566: tv.tv_sec = options.server_alive_interval;
567: tv.tv_usec = 0;
568: tvp = &tv;
569: }
570: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
571: if (ret < 0) {
1.11 markus 572: char buf[100];
1.51 markus 573:
574: /*
575: * We have to clear the select masks, because we return.
576: * We have to return, because the mainloop checks for the flags
577: * set by the signal handlers.
578: */
1.87 markus 579: memset(*readsetp, 0, *nallocp);
580: memset(*writesetp, 0, *nallocp);
1.50 deraadt 581:
1.11 markus 582: if (errno == EINTR)
583: return;
584: /* Note: we might still have data in the buffers. */
585: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
586: buffer_append(&stderr_buffer, buf, strlen(buf));
587: quit_pending = 1;
1.117 markus 588: } else if (ret == 0)
589: server_alive_check();
1.11 markus 590: }
591:
1.77 itojun 592: static void
1.31 markus 593: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 594: {
1.11 markus 595: /* Flush stdout and stderr buffers. */
1.31 markus 596: if (buffer_len(bout) > 0)
1.197 djm 597: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
598: buffer_len(bout));
1.31 markus 599: if (buffer_len(berr) > 0)
1.197 djm 600: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
601: buffer_len(berr));
1.11 markus 602:
603: leave_raw_mode();
604:
1.13 markus 605: /*
606: * Free (and clear) the buffer to reduce the amount of data that gets
607: * written to swap.
608: */
1.31 markus 609: buffer_free(bin);
610: buffer_free(bout);
611: buffer_free(berr);
1.11 markus 612:
613: /* Send the suspend signal to the program itself. */
614: kill(getpid(), SIGTSTP);
615:
1.132 djm 616: /* Reset window sizes in case they have changed */
617: received_window_change_signal = 1;
1.11 markus 618:
619: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 620: buffer_init(bin);
621: buffer_init(bout);
622: buffer_init(berr);
1.11 markus 623:
624: enter_raw_mode();
625: }
626:
1.77 itojun 627: static void
1.161 deraadt 628: client_process_net_input(fd_set *readset)
1.11 markus 629: {
1.17 markus 630: int len;
631: char buf[8192];
1.11 markus 632:
1.13 markus 633: /*
634: * Read input from the server, and add any such data to the buffer of
635: * the packet subsystem.
636: */
1.11 markus 637: if (FD_ISSET(connection_in, readset)) {
638: /* Read as much as possible. */
639: len = read(connection_in, buf, sizeof(buf));
640: if (len == 0) {
1.197 djm 641: /*
642: * Received EOF. The remote host has closed the
643: * connection.
644: */
645: snprintf(buf, sizeof buf,
646: "Connection to %.300s closed by remote host.\r\n",
647: host);
1.1 deraadt 648: buffer_append(&stderr_buffer, buf, strlen(buf));
649: quit_pending = 1;
650: return;
1.11 markus 651: }
1.13 markus 652: /*
653: * There is a kernel bug on Solaris that causes select to
654: * sometimes wake up even though there is no data available.
655: */
1.53 millert 656: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 657: len = 0;
658:
659: if (len < 0) {
1.197 djm 660: /*
661: * An error has encountered. Perhaps there is a
662: * network problem.
663: */
664: snprintf(buf, sizeof buf,
665: "Read from remote host %.300s: %.100s\r\n",
666: host, strerror(errno));
1.11 markus 667: buffer_append(&stderr_buffer, buf, strlen(buf));
668: quit_pending = 1;
669: return;
670: }
671: packet_process_incoming(buf, len);
672: }
1.17 markus 673: }
1.16 markus 674:
1.97 jakob 675: static void
1.190 djm 676: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 677: {
1.190 djm 678: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
679: char errmsg[256];
680: int tochan;
681:
682: /* XXX supress on mux _client_ quietmode */
683: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
684: c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
685:
686: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
687: debug2("%s request accepted on channel %d",
688: cr->request_type, c->self);
689: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
690: if (tochan) {
691: snprintf(errmsg, sizeof(errmsg),
692: "%s request failed\r\n", cr->request_type);
693: } else {
694: snprintf(errmsg, sizeof(errmsg),
695: "%s request failed on channel %d",
696: cr->request_type, c->self);
697: }
698: /* If error occurred on primary session channel, then exit */
699: if (cr->do_close && c->self == session_ident)
700: fatal("%s", errmsg);
701: /* If error occurred on mux client, append to their stderr */
702: if (tochan)
703: buffer_append(&c->extended, errmsg, strlen(errmsg));
704: else
705: error("%s", errmsg);
706: if (cr->do_close) {
707: chan_read_failed(c);
708: chan_write_failed(c);
709: }
710: }
711: xfree(cr);
712: }
713:
714: static void
715: client_abandon_status_confirm(Channel *c, void *ctx)
716: {
717: xfree(ctx);
718: }
1.129 deraadt 719:
1.190 djm 720: static void
721: client_expect_confirm(int id, const char *request, int do_close)
722: {
723: struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
1.123 djm 724:
1.190 djm 725: cr->request_type = request;
726: cr->do_close = do_close;
1.123 djm 727:
1.190 djm 728: channel_register_status_confirm(id, client_status_confirm,
729: client_abandon_status_confirm, cr);
1.196 djm 730: }
731:
732: void
733: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
734: {
1.201 ! djm 735: struct global_confirm *gc, *last_gc;
1.196 djm 736:
737: /* Coalesce identical callbacks */
1.201 ! djm 738: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
! 739: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
! 740: if (++last_gc->ref_count >= INT_MAX)
! 741: fatal("%s: last_gc->ref_count = %d",
! 742: __func__, last_gc->ref_count);
1.196 djm 743: return;
744: }
745:
746: gc = xmalloc(sizeof(*gc));
747: gc->cb = cb;
748: gc->ctx = ctx;
749: gc->ref_count = 1;
750: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 751: }
752:
753: static void
1.99 markus 754: process_cmdline(void)
1.97 jakob 755: {
756: void (*handler)(int);
1.135 djm 757: char *s, *cmd, *cancel_host;
1.121 djm 758: int delete = 0;
1.97 jakob 759: int local = 0;
1.135 djm 760: u_short cancel_port;
761: Forward fwd;
1.97 jakob 762:
1.183 djm 763: bzero(&fwd, sizeof(fwd));
764: fwd.listen_host = fwd.connect_host = NULL;
765:
1.97 jakob 766: leave_raw_mode();
1.101 markus 767: handler = signal(SIGINT, SIG_IGN);
1.99 markus 768: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 769: if (s == NULL)
770: goto out;
1.179 tedu 771: while (isspace(*s))
1.97 jakob 772: s++;
1.121 djm 773: if (*s == '-')
774: s++; /* Skip cmdline '-', if any */
1.120 dtucker 775: if (*s == '\0')
1.97 jakob 776: goto out;
1.121 djm 777:
1.122 djm 778: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 779: logit("Commands:");
1.164 djm 780: logit(" -L[bind_address:]port:host:hostport "
781: "Request local forward");
782: logit(" -R[bind_address:]port:host:hostport "
783: "Request remote forward");
1.165 stevesk 784: logit(" -KR[bind_address:]port "
1.164 djm 785: "Cancel remote forward");
1.146 reyk 786: if (!options.permit_local_command)
787: goto out;
1.164 djm 788: logit(" !args "
789: "Execute local command");
1.146 reyk 790: goto out;
791: }
792:
793: if (*s == '!' && options.permit_local_command) {
794: s++;
795: ssh_local_cmd(s);
1.121 djm 796: goto out;
797: }
798:
799: if (*s == 'K') {
800: delete = 1;
801: s++;
802: }
803: if (*s != 'L' && *s != 'R') {
1.109 itojun 804: logit("Invalid command.");
1.97 jakob 805: goto out;
806: }
1.121 djm 807: if (*s == 'L')
1.97 jakob 808: local = 1;
1.121 djm 809: if (local && delete) {
810: logit("Not supported.");
811: goto out;
812: }
813: if ((!local || delete) && !compat20) {
1.109 itojun 814: logit("Not supported for SSH protocol version 1.");
1.97 jakob 815: goto out;
816: }
1.121 djm 817:
1.179 tedu 818: while (isspace(*++s))
819: ;
1.97 jakob 820:
1.121 djm 821: if (delete) {
1.135 djm 822: cancel_port = 0;
823: cancel_host = hpdelim(&s); /* may be NULL */
824: if (s != NULL) {
825: cancel_port = a2port(s);
826: cancel_host = cleanhostname(cancel_host);
827: } else {
828: cancel_port = a2port(cancel_host);
829: cancel_host = NULL;
1.121 djm 830: }
1.135 djm 831: if (cancel_port == 0) {
832: logit("Bad forwarding close port");
1.121 djm 833: goto out;
834: }
1.135 djm 835: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 836: } else {
1.135 djm 837: if (!parse_forward(&fwd, s)) {
1.121 djm 838: logit("Bad forwarding specification.");
839: goto out;
840: }
841: if (local) {
1.135 djm 842: if (channel_setup_local_fwd_listener(fwd.listen_host,
843: fwd.listen_port, fwd.connect_host,
844: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 845: logit("Port forwarding failed.");
846: goto out;
847: }
1.135 djm 848: } else {
1.167 markus 849: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 850: fwd.listen_port, fwd.connect_host,
1.167 markus 851: fwd.connect_port) < 0) {
852: logit("Port forwarding failed.");
853: goto out;
854: }
1.135 djm 855: }
856:
1.121 djm 857: logit("Forwarding port.");
858: }
859:
1.97 jakob 860: out:
861: signal(SIGINT, handler);
862: enter_raw_mode();
863: if (cmd)
864: xfree(cmd);
1.183 djm 865: if (fwd.listen_host != NULL)
866: xfree(fwd.listen_host);
867: if (fwd.connect_host != NULL)
868: xfree(fwd.connect_host);
1.97 jakob 869: }
870:
1.195 djm 871: /*
872: * Process the characters one by one, call with c==NULL for proto1 case.
873: */
1.77 itojun 874: static int
1.195 djm 875: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
876: char *buf, int len)
1.31 markus 877: {
1.32 markus 878: char string[1024];
1.31 markus 879: pid_t pid;
880: int bytes = 0;
1.42 markus 881: u_int i;
882: u_char ch;
1.31 markus 883: char *s;
1.195 djm 884: int *escape_pendingp, escape_char;
885: struct escape_filter_ctx *efc;
1.31 markus 886:
1.195 djm 887: if (c == NULL) {
888: escape_pendingp = &escape_pending1;
889: escape_char = escape_char1;
890: } else {
891: if (c->filter_ctx == NULL)
892: return 0;
893: efc = (struct escape_filter_ctx *)c->filter_ctx;
894: escape_pendingp = &efc->escape_pending;
895: escape_char = efc->escape_char;
896: }
897:
1.139 djm 898: if (len <= 0)
899: return (0);
900:
901: for (i = 0; i < (u_int)len; i++) {
1.31 markus 902: /* Get one character at a time. */
903: ch = buf[i];
904:
1.195 djm 905: if (*escape_pendingp) {
1.31 markus 906: /* We have previously seen an escape character. */
907: /* Clear the flag now. */
1.195 djm 908: *escape_pendingp = 0;
1.31 markus 909:
910: /* Process the escaped character. */
911: switch (ch) {
912: case '.':
913: /* Terminate the connection. */
1.195 djm 914: snprintf(string, sizeof string, "%c.\r\n",
915: escape_char);
1.32 markus 916: buffer_append(berr, string, strlen(string));
1.31 markus 917:
1.195 djm 918: if (c && c->ctl_fd != -1) {
919: chan_read_failed(c);
920: chan_write_failed(c);
921: return 0;
922: } else
923: quit_pending = 1;
1.31 markus 924: return -1;
925:
926: case 'Z' - 64:
1.195 djm 927: /* XXX support this for mux clients */
928: if (c && c->ctl_fd != -1) {
929: noescape:
930: snprintf(string, sizeof string,
931: "%c%c escape not available to "
932: "multiplexed sessions\r\n",
933: escape_char, ch);
934: buffer_append(berr, string,
935: strlen(string));
936: continue;
937: }
1.197 djm 938: /* Suspend the program. Inform the user */
1.195 djm 939: snprintf(string, sizeof string,
940: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 941: buffer_append(berr, string, strlen(string));
1.31 markus 942:
943: /* Restore terminal modes and suspend. */
944: client_suspend_self(bin, bout, berr);
945:
946: /* We have been continued. */
947: continue;
948:
1.111 markus 949: case 'B':
950: if (compat20) {
951: snprintf(string, sizeof string,
952: "%cB\r\n", escape_char);
953: buffer_append(berr, string,
954: strlen(string));
955: channel_request_start(session_ident,
956: "break", 0);
957: packet_put_int(1000);
958: packet_send();
959: }
960: continue;
961:
1.54 markus 962: case 'R':
1.59 markus 963: if (compat20) {
964: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 965: logit("Server does not "
966: "support re-keying");
1.59 markus 967: else
968: need_rekeying = 1;
969: }
1.54 markus 970: continue;
971:
1.31 markus 972: case '&':
1.195 djm 973: if (c && c->ctl_fd != -1)
974: goto noescape;
1.31 markus 975: /*
1.197 djm 976: * Detach the program (continue to serve
977: * connections, but put in background and no
978: * more new connections).
1.31 markus 979: */
980: /* Restore tty modes. */
981: leave_raw_mode();
982:
983: /* Stop listening for new connections. */
1.86 markus 984: channel_stop_listening();
1.31 markus 985:
1.86 markus 986: snprintf(string, sizeof string,
987: "%c& [backgrounded]\n", escape_char);
988: buffer_append(berr, string, strlen(string));
1.31 markus 989:
990: /* Fork into background. */
991: pid = fork();
992: if (pid < 0) {
993: error("fork: %.100s", strerror(errno));
994: continue;
995: }
996: if (pid != 0) { /* This is the parent. */
997: /* The parent just exits. */
998: exit(0);
999: }
1000: /* The child continues serving connections. */
1.86 markus 1001: if (compat20) {
1002: buffer_append(bin, "\004", 1);
1003: /* fake EOF on stdin */
1004: return -1;
1005: } else if (!stdin_eof) {
1006: /*
1.197 djm 1007: * Sending SSH_CMSG_EOF alone does not
1008: * always appear to be enough. So we
1009: * try to send an EOF character first.
1.86 markus 1010: */
1011: packet_start(SSH_CMSG_STDIN_DATA);
1012: packet_put_string("\004", 1);
1013: packet_send();
1014: /* Close stdin. */
1015: stdin_eof = 1;
1016: if (buffer_len(bin) == 0) {
1017: packet_start(SSH_CMSG_EOF);
1018: packet_send();
1019: }
1020: }
1021: continue;
1.31 markus 1022:
1023: case '?':
1.195 djm 1024: if (c && c->ctl_fd != -1) {
1025: snprintf(string, sizeof string,
1026: "%c?\r\n\
1027: Supported escape sequences:\r\n\
1028: %c. - terminate session\r\n\
1029: %cB - send a BREAK to the remote system\r\n\
1030: %cC - open a command line\r\n\
1031: %cR - Request rekey (SSH protocol 2 only)\r\n\
1032: %c# - list forwarded connections\r\n\
1033: %c? - this message\r\n\
1034: %c%c - send the escape character by typing it twice\r\n\
1035: (Note that escapes are only recognized immediately after newline.)\r\n",
1036: escape_char, escape_char,
1037: escape_char, escape_char,
1038: escape_char, escape_char,
1039: escape_char, escape_char,
1040: escape_char);
1041: } else {
1042: snprintf(string, sizeof string,
1.31 markus 1043: "%c?\r\n\
1044: Supported escape sequences:\r\n\
1.195 djm 1045: %c. - terminate connection (and any multiplexed sessions)\r\n\
1046: %cB - send a BREAK to the remote system\r\n\
1047: %cC - open a command line\r\n\
1048: %cR - Request rekey (SSH protocol 2 only)\r\n\
1049: %c^Z - suspend ssh\r\n\
1050: %c# - list forwarded connections\r\n\
1051: %c& - background ssh (when waiting for connections to terminate)\r\n\
1052: %c? - this message\r\n\
1053: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1054: (Note that escapes are only recognized immediately after newline.)\r\n",
1.195 djm 1055: escape_char, escape_char,
1056: escape_char, escape_char,
1057: escape_char, escape_char,
1058: escape_char, escape_char,
1059: escape_char, escape_char,
1060: escape_char);
1061: }
1.32 markus 1062: buffer_append(berr, string, strlen(string));
1.31 markus 1063: continue;
1064:
1065: case '#':
1.195 djm 1066: snprintf(string, sizeof string, "%c#\r\n",
1067: escape_char);
1.32 markus 1068: buffer_append(berr, string, strlen(string));
1.31 markus 1069: s = channel_open_message();
1070: buffer_append(berr, s, strlen(s));
1071: xfree(s);
1.97 jakob 1072: continue;
1073:
1074: case 'C':
1.99 markus 1075: process_cmdline();
1.31 markus 1076: continue;
1077:
1078: default:
1079: if (ch != escape_char) {
1080: buffer_put_char(bin, escape_char);
1081: bytes++;
1082: }
1083: /* Escaped characters fall through here */
1084: break;
1085: }
1086: } else {
1087: /*
1.197 djm 1088: * The previous character was not an escape char.
1089: * Check if this is an escape.
1.31 markus 1090: */
1091: if (last_was_cr && ch == escape_char) {
1.197 djm 1092: /*
1093: * It is. Set the flag and continue to
1094: * next character.
1095: */
1.195 djm 1096: *escape_pendingp = 1;
1.31 markus 1097: continue;
1098: }
1099: }
1100:
1101: /*
1102: * Normal character. Record whether it was a newline,
1103: * and append it to the buffer.
1104: */
1105: last_was_cr = (ch == '\r' || ch == '\n');
1106: buffer_put_char(bin, ch);
1107: bytes++;
1108: }
1109: return bytes;
1110: }
1111:
1.77 itojun 1112: static void
1.161 deraadt 1113: client_process_input(fd_set *readset)
1.17 markus 1114: {
1.21 deraadt 1115: int len;
1.31 markus 1116: char buf[8192];
1.16 markus 1117:
1.11 markus 1118: /* Read input from stdin. */
1119: if (FD_ISSET(fileno(stdin), readset)) {
1120: /* Read as much as possible. */
1121: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1122: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1123: return; /* we'll try again later */
1.11 markus 1124: if (len <= 0) {
1.13 markus 1125: /*
1126: * Received EOF or error. They are treated
1127: * similarly, except that an error message is printed
1128: * if it was an error condition.
1129: */
1.11 markus 1130: if (len < 0) {
1.197 djm 1131: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1132: strerror(errno));
1.11 markus 1133: buffer_append(&stderr_buffer, buf, strlen(buf));
1134: }
1135: /* Mark that we have seen EOF. */
1136: stdin_eof = 1;
1.13 markus 1137: /*
1138: * Send an EOF message to the server unless there is
1139: * data in the buffer. If there is data in the
1140: * buffer, no message will be sent now. Code
1141: * elsewhere will send the EOF when the buffer
1142: * becomes empty if stdin_eof is set.
1143: */
1.11 markus 1144: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1145: packet_start(SSH_CMSG_EOF);
1146: packet_send();
1.11 markus 1147: }
1.195 djm 1148: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1149: /*
1150: * Normal successful read, and no escape character.
1151: * Just append the data to buffer.
1152: */
1.11 markus 1153: buffer_append(&stdin_buffer, buf, len);
1154: } else {
1.13 markus 1155: /*
1.197 djm 1156: * Normal, successful read. But we have an escape
1157: * character and have to process the characters one
1158: * by one.
1.13 markus 1159: */
1.195 djm 1160: if (process_escapes(NULL, &stdin_buffer,
1161: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1162: return;
1.11 markus 1163: }
1164: }
1165: }
1166:
1.77 itojun 1167: static void
1.161 deraadt 1168: client_process_output(fd_set *writeset)
1.11 markus 1169: {
1170: int len;
1171: char buf[100];
1.1 deraadt 1172:
1.11 markus 1173: /* Write buffered output to stdout. */
1174: if (FD_ISSET(fileno(stdout), writeset)) {
1175: /* Write as much data as possible. */
1176: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1177: buffer_len(&stdout_buffer));
1.11 markus 1178: if (len <= 0) {
1.64 markus 1179: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1180: len = 0;
1181: else {
1.13 markus 1182: /*
1183: * An error or EOF was encountered. Put an
1184: * error message to stderr buffer.
1185: */
1.197 djm 1186: snprintf(buf, sizeof buf,
1187: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1188: buffer_append(&stderr_buffer, buf, strlen(buf));
1189: quit_pending = 1;
1190: return;
1191: }
1192: }
1193: /* Consume printed data from the buffer. */
1194: buffer_consume(&stdout_buffer, len);
1195: }
1196: /* Write buffered output to stderr. */
1197: if (FD_ISSET(fileno(stderr), writeset)) {
1198: /* Write as much data as possible. */
1199: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1200: buffer_len(&stderr_buffer));
1.11 markus 1201: if (len <= 0) {
1.64 markus 1202: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1203: len = 0;
1204: else {
1.197 djm 1205: /*
1206: * EOF or error, but can't even print
1207: * error message.
1208: */
1.11 markus 1209: quit_pending = 1;
1210: return;
1211: }
1212: }
1213: /* Consume printed characters from the buffer. */
1214: buffer_consume(&stderr_buffer, len);
1215: }
1.1 deraadt 1216: }
1217:
1.13 markus 1218: /*
1.15 markus 1219: * Get packets from the connection input buffer, and process them as long as
1220: * there are packets available.
1221: *
1222: * Any unknown packets received during the actual
1223: * session cause the session to terminate. This is
1224: * intended to make debugging easier since no
1225: * confirmations are sent. Any compatible protocol
1226: * extensions must be negotiated during the
1227: * preparatory phase.
1228: */
1229:
1.77 itojun 1230: static void
1.49 itojun 1231: client_process_buffered_input_packets(void)
1.15 markus 1232: {
1.197 djm 1233: dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1234: compat20 ? xxx_kex : NULL);
1.15 markus 1235: }
1236:
1.31 markus 1237: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1238:
1.195 djm 1239: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1240: void *
1241: client_new_escape_filter_ctx(int escape_char)
1242: {
1243: struct escape_filter_ctx *ret;
1244:
1245: ret = xmalloc(sizeof(*ret));
1246: ret->escape_pending = 0;
1247: ret->escape_char = escape_char;
1248: return (void *)ret;
1249: }
1250:
1.198 djm 1251: /* Free the escape filter context on channel free */
1252: void
1253: client_filter_cleanup(int cid, void *ctx)
1254: {
1255: xfree(ctx);
1256: }
1257:
1.195 djm 1258: int
1259: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1260: {
1.190 djm 1261: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1262: return 0;
1263:
1.195 djm 1264: return process_escapes(c, &c->input, &c->output, &c->extended,
1265: buf, len);
1.30 markus 1266: }
1267:
1.77 itojun 1268: static void
1.60 markus 1269: client_channel_closed(int id, void *arg)
1270: {
1.83 markus 1271: channel_cancel_cleanup(id);
1.60 markus 1272: session_closed = 1;
1.113 markus 1273: leave_raw_mode();
1.60 markus 1274: }
1275:
1.15 markus 1276: /*
1.13 markus 1277: * Implements the interactive session with the server. This is called after
1278: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1279: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1280: * used as an escape character for terminating or suspending the session.
1.13 markus 1281: */
1.1 deraadt 1282:
1.20 markus 1283: int
1.30 markus 1284: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1285: {
1.46 markus 1286: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1287: double start_time, total_time;
1.130 avsm 1288: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1.200 markus 1289: u_int64_t ibytes, obytes;
1.130 avsm 1290: u_int nalloc = 0;
1.11 markus 1291: char buf[100];
1292:
1293: debug("Entering interactive session.");
1294:
1295: start_time = get_current_time();
1296:
1297: /* Initialize variables. */
1.195 djm 1298: escape_pending1 = 0;
1.11 markus 1299: last_was_cr = 1;
1300: exit_status = -1;
1301: stdin_eof = 0;
1302: buffer_high = 64 * 1024;
1303: connection_in = packet_get_connection_in();
1304: connection_out = packet_get_connection_out();
1.46 markus 1305: max_fd = MAX(connection_in, connection_out);
1.192 djm 1306: if (muxserver_sock != -1)
1307: max_fd = MAX(max_fd, muxserver_sock);
1.46 markus 1308:
1309: if (!compat20) {
1.63 markus 1310: /* enable nonblocking unless tty */
1311: if (!isatty(fileno(stdin)))
1312: set_nonblock(fileno(stdin));
1313: if (!isatty(fileno(stdout)))
1314: set_nonblock(fileno(stdout));
1315: if (!isatty(fileno(stderr)))
1316: set_nonblock(fileno(stderr));
1.46 markus 1317: max_fd = MAX(max_fd, fileno(stdin));
1318: max_fd = MAX(max_fd, fileno(stdout));
1319: max_fd = MAX(max_fd, fileno(stderr));
1320: }
1.11 markus 1321: quit_pending = 0;
1.195 djm 1322: escape_char1 = escape_char_arg;
1.11 markus 1323:
1324: /* Initialize buffers. */
1325: buffer_init(&stdin_buffer);
1326: buffer_init(&stdout_buffer);
1327: buffer_init(&stderr_buffer);
1328:
1.15 markus 1329: client_init_dispatch();
1330:
1.105 markus 1331: /*
1332: * Set signal handlers, (e.g. to restore non-blocking mode)
1333: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1334: */
1.131 djm 1335: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1336: signal(SIGHUP, signal_handler);
1.105 markus 1337: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1338: signal(SIGINT, signal_handler);
1339: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1340: signal(SIGQUIT, signal_handler);
1341: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1342: signal(SIGTERM, signal_handler);
1.132 djm 1343: signal(SIGWINCH, window_change_handler);
1.11 markus 1344:
1345: if (have_pty)
1346: enter_raw_mode();
1347:
1.48 markus 1348: if (compat20) {
1349: session_ident = ssh2_chan_id;
1.195 djm 1350: if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1.48 markus 1351: channel_register_filter(session_ident,
1.195 djm 1352: client_simple_escape_filter, NULL,
1.198 djm 1353: client_filter_cleanup,
1.195 djm 1354: client_new_escape_filter_ctx(escape_char_arg));
1.60 markus 1355: if (session_ident != -1)
1356: channel_register_cleanup(session_ident,
1.143 djm 1357: client_channel_closed, 0);
1.48 markus 1358: } else {
1359: /* Check if we should immediately send eof on stdin. */
1.16 markus 1360: client_check_initial_eof_on_stdin();
1.48 markus 1361: }
1.30 markus 1362:
1.11 markus 1363: /* Main loop of the client for the interactive session mode. */
1364: while (!quit_pending) {
1365:
1.13 markus 1366: /* Process buffered packets sent by the server. */
1.11 markus 1367: client_process_buffered_input_packets();
1368:
1.60 markus 1369: if (compat20 && session_closed && !channel_still_open())
1370: break;
1371:
1.56 markus 1372: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1373:
1.56 markus 1374: if (rekeying) {
1375: debug("rekeying in progress");
1376: } else {
1377: /*
1378: * Make packets of buffered stdin data, and buffer
1379: * them for sending to the server.
1380: */
1381: if (!compat20)
1382: client_make_packets_from_stdin_data();
1.11 markus 1383:
1.56 markus 1384: /*
1385: * Make packets from buffered channel data, and
1386: * enqueue them for sending to the server.
1387: */
1388: if (packet_not_very_much_data_to_write())
1389: channel_output_poll();
1.11 markus 1390:
1.56 markus 1391: /*
1392: * Check if the window size has changed, and buffer a
1393: * message about it to the server if so.
1394: */
1395: client_check_window_change();
1.11 markus 1396:
1.56 markus 1397: if (quit_pending)
1398: break;
1399: }
1.13 markus 1400: /*
1401: * Wait until we have something to do (something becomes
1402: * available on one of the descriptors).
1403: */
1.81 markus 1404: max_fd2 = max_fd;
1.56 markus 1405: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1406: &max_fd2, &nalloc, rekeying);
1.11 markus 1407:
1408: if (quit_pending)
1409: break;
1410:
1.56 markus 1411: /* Do channel operations unless rekeying in progress. */
1412: if (!rekeying) {
1413: channel_after_select(readset, writeset);
1.108 markus 1414: if (need_rekeying || packet_need_rekeying()) {
1415: debug("need rekeying");
1.56 markus 1416: xxx_kex->done = 0;
1417: kex_send_kexinit(xxx_kex);
1418: need_rekeying = 0;
1419: }
1420: }
1.11 markus 1421:
1.17 markus 1422: /* Buffer input from the connection. */
1.46 markus 1423: client_process_net_input(readset);
1.17 markus 1424:
1.123 djm 1425: /* Accept control connections. */
1.192 djm 1426: if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1427: if (muxserver_accept_control())
1428: quit_pending = 1;
1429: }
1.123 djm 1430:
1.17 markus 1431: if (quit_pending)
1432: break;
1.11 markus 1433:
1.17 markus 1434: if (!compat20) {
1435: /* Buffer data from stdin */
1.46 markus 1436: client_process_input(readset);
1.17 markus 1437: /*
1438: * Process output to stdout and stderr. Output to
1439: * the connection is processed elsewhere (above).
1440: */
1.46 markus 1441: client_process_output(writeset);
1.17 markus 1442: }
1.11 markus 1443:
1.197 djm 1444: /*
1445: * Send as much buffered packet data as possible to the
1446: * sender.
1447: */
1.46 markus 1448: if (FD_ISSET(connection_out, writeset))
1.11 markus 1449: packet_write_poll();
1450: }
1.46 markus 1451: if (readset)
1452: xfree(readset);
1453: if (writeset)
1454: xfree(writeset);
1.11 markus 1455:
1456: /* Terminate the session. */
1457:
1458: /* Stop watching for window change. */
1.132 djm 1459: signal(SIGWINCH, SIG_DFL);
1.11 markus 1460:
1.76 markus 1461: channel_free_all();
1.11 markus 1462:
1.75 markus 1463: if (have_pty)
1464: leave_raw_mode();
1465:
1466: /* restore blocking io */
1467: if (!isatty(fileno(stdin)))
1468: unset_nonblock(fileno(stdin));
1469: if (!isatty(fileno(stdout)))
1470: unset_nonblock(fileno(stdout));
1471: if (!isatty(fileno(stderr)))
1472: unset_nonblock(fileno(stderr));
1.116 dtucker 1473:
1474: /*
1475: * If there was no shell or command requested, there will be no remote
1476: * exit status to be returned. In that case, clear error code if the
1477: * connection was deliberately terminated at this end.
1478: */
1479: if (no_shell_flag && received_signal == SIGTERM) {
1480: received_signal = 0;
1481: exit_status = 0;
1482: }
1.75 markus 1483:
1.113 markus 1484: if (received_signal)
1.89 itojun 1485: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1486:
1.13 markus 1487: /*
1488: * In interactive mode (with pseudo tty) display a message indicating
1489: * that the connection has been closed.
1490: */
1.11 markus 1491: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1492: snprintf(buf, sizeof buf,
1493: "Connection to %.64s closed.\r\n", host);
1.11 markus 1494: buffer_append(&stderr_buffer, buf, strlen(buf));
1495: }
1.70 markus 1496:
1.11 markus 1497: /* Output any buffered data for stdout. */
1.70 markus 1498: while (buffer_len(&stdout_buffer) > 0) {
1499: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1500: buffer_len(&stdout_buffer));
1.70 markus 1501: if (len <= 0) {
1.11 markus 1502: error("Write failed flushing stdout buffer.");
1.70 markus 1503: break;
1504: }
1.11 markus 1505: buffer_consume(&stdout_buffer, len);
1506: }
1507:
1508: /* Output any buffered data for stderr. */
1.70 markus 1509: while (buffer_len(&stderr_buffer) > 0) {
1510: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1511: buffer_len(&stderr_buffer));
1.70 markus 1512: if (len <= 0) {
1.11 markus 1513: error("Write failed flushing stderr buffer.");
1.70 markus 1514: break;
1515: }
1.11 markus 1516: buffer_consume(&stderr_buffer, len);
1517: }
1518:
1519: /* Clear and free any buffers. */
1520: memset(buf, 0, sizeof(buf));
1521: buffer_free(&stdin_buffer);
1522: buffer_free(&stdout_buffer);
1523: buffer_free(&stderr_buffer);
1524:
1525: /* Report bytes transferred, and transfer rates. */
1526: total_time = get_current_time() - start_time;
1.200 markus 1527: packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1528: packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1529: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1530: obytes, ibytes, total_time);
1.11 markus 1531: if (total_time > 0)
1.200 markus 1532: verbose("Bytes per second: sent %.1f, received %.1f",
1533: obytes / total_time, ibytes / total_time);
1.11 markus 1534: /* Return the exit status of the program. */
1535: debug("Exit status %d", exit_status);
1536: return exit_status;
1.15 markus 1537: }
1538:
1539: /*********/
1540:
1.77 itojun 1541: static void
1.94 markus 1542: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1543: {
1.42 markus 1544: u_int data_len;
1.15 markus 1545: char *data = packet_get_string(&data_len);
1.93 markus 1546: packet_check_eom();
1.15 markus 1547: buffer_append(&stdout_buffer, data, data_len);
1548: memset(data, 0, data_len);
1549: xfree(data);
1550: }
1.77 itojun 1551: static void
1.94 markus 1552: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1553: {
1.42 markus 1554: u_int data_len;
1.15 markus 1555: char *data = packet_get_string(&data_len);
1.93 markus 1556: packet_check_eom();
1.15 markus 1557: buffer_append(&stderr_buffer, data, data_len);
1558: memset(data, 0, data_len);
1559: xfree(data);
1560: }
1.77 itojun 1561: static void
1.94 markus 1562: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1563: {
1564: exit_status = packet_get_int();
1.93 markus 1565: packet_check_eom();
1.15 markus 1566: /* Acknowledge the exit. */
1567: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1568: packet_send();
1569: /*
1570: * Must wait for packet to be sent since we are
1571: * exiting the loop.
1572: */
1573: packet_write_wait();
1574: /* Flag that we want to exit. */
1575: quit_pending = 1;
1576: }
1.115 markus 1577: static void
1578: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1579: {
1580: Channel *c = NULL;
1581: int remote_id, sock;
1582:
1583: /* Read the remote channel number from the message. */
1584: remote_id = packet_get_int();
1585: packet_check_eom();
1586:
1587: /*
1588: * Get a connection to the local authentication agent (this may again
1589: * get forwarded).
1590: */
1591: sock = ssh_get_authentication_socket();
1592:
1593: /*
1594: * If we could not connect the agent, send an error message back to
1595: * the server. This should never happen unless the agent dies,
1596: * because authentication forwarding is only enabled if we have an
1597: * agent.
1598: */
1599: if (sock >= 0) {
1600: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1601: -1, 0, 0, 0, "authentication agent connection", 1);
1602: c->remote_id = remote_id;
1603: c->force_drain = 1;
1604: }
1605: if (c == NULL) {
1606: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1607: packet_put_int(remote_id);
1608: } else {
1609: /* Send a confirmation to the remote host. */
1610: debug("Forwarding authentication connection.");
1611: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1612: packet_put_int(remote_id);
1613: packet_put_int(c->self);
1614: }
1615: packet_send();
1616: }
1.15 markus 1617:
1.77 itojun 1618: static Channel *
1.40 markus 1619: client_request_forwarded_tcpip(const char *request_type, int rchan)
1620: {
1.103 deraadt 1621: Channel *c = NULL;
1.40 markus 1622: char *listen_address, *originator_address;
1623: int listen_port, originator_port;
1624:
1625: /* Get rest of the packet */
1626: listen_address = packet_get_string(NULL);
1627: listen_port = packet_get_int();
1628: originator_address = packet_get_string(NULL);
1629: originator_port = packet_get_int();
1.93 markus 1630: packet_check_eom();
1.40 markus 1631:
1.191 djm 1632: debug("client_request_forwarded_tcpip: listen %s port %d, "
1633: "originator %s port %d", listen_address, listen_port,
1634: originator_address, originator_port);
1635:
1636: c = channel_connect_by_listen_address(listen_port,
1637: "forwarded-tcpip", originator_address);
1.40 markus 1638:
1639: xfree(originator_address);
1640: xfree(listen_address);
1641: return c;
1642: }
1643:
1.103 deraadt 1644: static Channel *
1.40 markus 1645: client_request_x11(const char *request_type, int rchan)
1646: {
1647: Channel *c = NULL;
1648: char *originator;
1649: int originator_port;
1.67 markus 1650: int sock;
1.40 markus 1651:
1652: if (!options.forward_x11) {
1653: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1654: error("Warning: this is probably a break-in attempt by a "
1655: "malicious server.");
1.40 markus 1656: return NULL;
1657: }
1658: originator = packet_get_string(NULL);
1659: if (datafellows & SSH_BUG_X11FWD) {
1660: debug2("buggy server: x11 request w/o originator_port");
1661: originator_port = 0;
1662: } else {
1663: originator_port = packet_get_int();
1664: }
1.93 markus 1665: packet_check_eom();
1.40 markus 1666: /* XXX check permission */
1.47 markus 1667: debug("client_request_x11: request from %s %d", originator,
1668: originator_port);
1.67 markus 1669: xfree(originator);
1.40 markus 1670: sock = x11_connect_display();
1.67 markus 1671: if (sock < 0)
1672: return NULL;
1673: c = channel_new("x11",
1674: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1675: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1676: c->force_drain = 1;
1.40 markus 1677: return c;
1678: }
1679:
1.103 deraadt 1680: static Channel *
1.40 markus 1681: client_request_agent(const char *request_type, int rchan)
1682: {
1683: Channel *c = NULL;
1.67 markus 1684: int sock;
1.40 markus 1685:
1686: if (!options.forward_agent) {
1687: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1688: error("Warning: this is probably a break-in attempt by a "
1689: "malicious server.");
1.40 markus 1690: return NULL;
1691: }
1.177 stevesk 1692: sock = ssh_get_authentication_socket();
1.67 markus 1693: if (sock < 0)
1694: return NULL;
1695: c = channel_new("authentication agent connection",
1696: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1697: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1698: "authentication agent connection", 1);
1.82 markus 1699: c->force_drain = 1;
1.40 markus 1700: return c;
1.180 djm 1701: }
1702:
1703: int
1704: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1705: {
1706: Channel *c;
1707: int fd;
1708:
1709: if (tun_mode == SSH_TUNMODE_NO)
1710: return 0;
1711:
1712: if (!compat20) {
1713: error("Tunnel forwarding is not support for protocol 1");
1714: return -1;
1715: }
1716:
1717: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1718:
1719: /* Open local tunnel device */
1720: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1721: error("Tunnel device open failed.");
1722: return -1;
1723: }
1724:
1725: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1726: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1727: c->datagram = 1;
1728:
1729: packet_start(SSH2_MSG_CHANNEL_OPEN);
1730: packet_put_cstring("tun@openssh.com");
1731: packet_put_int(c->self);
1732: packet_put_int(c->local_window_max);
1733: packet_put_int(c->local_maxpacket);
1734: packet_put_int(tun_mode);
1735: packet_put_int(remote_tun);
1736: packet_send();
1737:
1738: return 0;
1.40 markus 1739: }
1740:
1.22 markus 1741: /* XXXX move to generic input handler */
1.77 itojun 1742: static void
1.94 markus 1743: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1744: {
1745: Channel *c = NULL;
1746: char *ctype;
1747: int rchan;
1.102 markus 1748: u_int rmaxpack, rwindow, len;
1.22 markus 1749:
1750: ctype = packet_get_string(&len);
1751: rchan = packet_get_int();
1752: rwindow = packet_get_int();
1753: rmaxpack = packet_get_int();
1754:
1.24 markus 1755: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1756: ctype, rchan, rwindow, rmaxpack);
1757:
1.40 markus 1758: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1759: c = client_request_forwarded_tcpip(ctype, rchan);
1760: } else if (strcmp(ctype, "x11") == 0) {
1761: c = client_request_x11(ctype, rchan);
1762: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1763: c = client_request_agent(ctype, rchan);
1.22 markus 1764: }
1765: /* XXX duplicate : */
1766: if (c != NULL) {
1767: debug("confirm %s", ctype);
1768: c->remote_id = rchan;
1769: c->remote_window = rwindow;
1770: c->remote_maxpacket = rmaxpack;
1.69 markus 1771: if (c->type != SSH_CHANNEL_CONNECTING) {
1772: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1773: packet_put_int(c->remote_id);
1774: packet_put_int(c->self);
1775: packet_put_int(c->local_window);
1776: packet_put_int(c->local_maxpacket);
1777: packet_send();
1778: }
1.22 markus 1779: } else {
1780: debug("failure %s", ctype);
1781: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1782: packet_put_int(rchan);
1783: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1784: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1785: packet_put_cstring("open failed");
1.66 markus 1786: packet_put_cstring("");
1787: }
1.22 markus 1788: packet_send();
1789: }
1790: xfree(ctype);
1791: }
1.77 itojun 1792: static void
1.94 markus 1793: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1794: {
1795: Channel *c = NULL;
1.123 djm 1796: int exitval, id, reply, success = 0;
1.48 markus 1797: char *rtype;
1798:
1799: id = packet_get_int();
1800: rtype = packet_get_string(NULL);
1801: reply = packet_get_char();
1802:
1803: debug("client_input_channel_req: channel %d rtype %s reply %d",
1804: id, rtype, reply);
1805:
1.128 djm 1806: if (id == -1) {
1807: error("client_input_channel_req: request for channel -1");
1808: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 1809: error("client_input_channel_req: channel %d: "
1810: "unknown channel", id);
1.193 markus 1811: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1812: packet_check_eom();
1813: chan_rcvd_eow(c);
1.48 markus 1814: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1815: exitval = packet_get_int();
1816: if (id == session_ident) {
1817: success = 1;
1818: exit_status = exitval;
1819: } else if (c->ctl_fd == -1) {
1820: error("client_input_channel_req: unexpected channel %d",
1821: session_ident);
1822: } else {
1823: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1824: success = 1;
1825: }
1.93 markus 1826: packet_check_eom();
1.48 markus 1827: }
1828: if (reply) {
1829: packet_start(success ?
1830: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1831: packet_put_int(id);
1.48 markus 1832: packet_send();
1833: }
1834: xfree(rtype);
1835: }
1.95 markus 1836: static void
1837: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1838: {
1839: char *rtype;
1840: int want_reply;
1841: int success = 0;
1842:
1843: rtype = packet_get_string(NULL);
1844: want_reply = packet_get_char();
1.117 markus 1845: debug("client_input_global_request: rtype %s want_reply %d",
1846: rtype, want_reply);
1.95 markus 1847: if (want_reply) {
1848: packet_start(success ?
1849: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1850: packet_send();
1851: packet_write_wait();
1852: }
1853: xfree(rtype);
1854: }
1.22 markus 1855:
1.123 djm 1856: void
1.129 deraadt 1857: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 1858: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 1859: {
1860: int len;
1.132 djm 1861: Channel *c = NULL;
1.123 djm 1862:
1863: debug2("%s: id %d", __func__, id);
1864:
1.132 djm 1865: if ((c = channel_lookup(id)) == NULL)
1866: fatal("client_session2_setup: channel %d: unknown channel", id);
1867:
1.123 djm 1868: if (want_tty) {
1869: struct winsize ws;
1870:
1871: /* Store window size in the packet. */
1872: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1873: memset(&ws, 0, sizeof(ws));
1874:
1.190 djm 1875: channel_request_start(id, "pty-req", 1);
1876: client_expect_confirm(id, "PTY allocation", 0);
1.123 djm 1877: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1878: packet_put_int((u_int)ws.ws_col);
1879: packet_put_int((u_int)ws.ws_row);
1880: packet_put_int((u_int)ws.ws_xpixel);
1881: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 1882: if (tiop == NULL)
1883: tiop = get_saved_tio();
1884: tty_make_modes(-1, tiop);
1.123 djm 1885: packet_send();
1886: /* XXX wait for reply */
1.132 djm 1887: c->client_tty = 1;
1.123 djm 1888: }
1889:
1890: /* Transfer any environment variables from client to server */
1.126 djm 1891: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1892: int i, j, matched;
1893: char *name, *val;
1894:
1895: debug("Sending environment.");
1.126 djm 1896: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1897: /* Split */
1.126 djm 1898: name = xstrdup(env[i]);
1.123 djm 1899: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1900: xfree(name);
1.123 djm 1901: continue;
1902: }
1903: *val++ = '\0';
1904:
1905: matched = 0;
1906: for (j = 0; j < options.num_send_env; j++) {
1907: if (match_pattern(name, options.send_env[j])) {
1908: matched = 1;
1909: break;
1910: }
1911: }
1912: if (!matched) {
1913: debug3("Ignored env %s", name);
1.144 stevesk 1914: xfree(name);
1.123 djm 1915: continue;
1916: }
1917:
1918: debug("Sending env %s = %s", name, val);
1919: channel_request_start(id, "env", 0);
1920: packet_put_cstring(name);
1921: packet_put_cstring(val);
1922: packet_send();
1.144 stevesk 1923: xfree(name);
1.123 djm 1924: }
1925: }
1926:
1927: len = buffer_len(cmd);
1928: if (len > 0) {
1929: if (len > 900)
1930: len = 900;
1931: if (want_subsystem) {
1.190 djm 1932: debug("Sending subsystem: %.*s",
1933: len, (u_char*)buffer_ptr(cmd));
1934: channel_request_start(id, "subsystem", 1);
1935: client_expect_confirm(id, "subsystem", 1);
1.123 djm 1936: } else {
1.190 djm 1937: debug("Sending command: %.*s",
1938: len, (u_char*)buffer_ptr(cmd));
1939: channel_request_start(id, "exec", 1);
1940: client_expect_confirm(id, "exec", 1);
1.123 djm 1941: }
1942: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1943: packet_send();
1944: } else {
1.190 djm 1945: channel_request_start(id, "shell", 1);
1946: client_expect_confirm(id, "shell", 1);
1.123 djm 1947: packet_send();
1948: }
1949: }
1950:
1.77 itojun 1951: static void
1.49 itojun 1952: client_init_dispatch_20(void)
1.16 markus 1953: {
1.55 markus 1954: dispatch_init(&dispatch_protocol_error);
1.100 markus 1955:
1.16 markus 1956: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1957: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1958: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1959: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1960: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1961: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1962: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1963: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1964: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 1965: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
1966: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 1967: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1968:
1969: /* rekeying */
1970: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1971:
1972: /* global request reply messages */
1973: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1974: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1975: }
1.197 djm 1976:
1.77 itojun 1977: static void
1.49 itojun 1978: client_init_dispatch_13(void)
1.15 markus 1979: {
1980: dispatch_init(NULL);
1981: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1982: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1983: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1984: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1985: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1986: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1987: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1988: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1989: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1990:
1991: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1992: &client_input_agent_open : &deny_input_open);
1.39 markus 1993: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1994: &x11_input_open : &deny_input_open);
1.15 markus 1995: }
1.197 djm 1996:
1.77 itojun 1997: static void
1.49 itojun 1998: client_init_dispatch_15(void)
1.15 markus 1999: {
2000: client_init_dispatch_13();
2001: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2002: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2003: }
1.197 djm 2004:
1.79 stevesk 2005: static void
1.49 itojun 2006: client_init_dispatch(void)
1.15 markus 2007: {
1.16 markus 2008: if (compat20)
2009: client_init_dispatch_20();
2010: else if (compat13)
1.15 markus 2011: client_init_dispatch_13();
2012: else
2013: client_init_dispatch_15();
1.113 markus 2014: }
2015:
2016: /* client specific fatal cleanup */
2017: void
1.114 markus 2018: cleanup_exit(int i)
1.113 markus 2019: {
2020: leave_raw_mode();
2021: leave_non_blocking();
1.192 djm 2022: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2023: unlink(options.control_path);
1.114 markus 2024: _exit(i);
1.1 deraadt 2025: }
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