Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.155
1.1 deraadt 1: /*
1.12 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.33 deraadt 5: * The main loop for the interactive session (client side).
1.20 markus 6: *
1.33 deraadt 7: * As far as I am concerned, the code I have written for this software
8: * can be used freely for any purpose. Any derived versions of this
9: * software must be clearly marked as such, and if the derived work is
10: * incompatible with the protocol description in the RFC file, it must be
11: * called by a name other than "ssh" or "Secure Shell".
12: *
13: *
14: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 35: *
36: *
1.33 deraadt 37: * SSH2 support added by Markus Friedl.
1.78 markus 38: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 39: *
1.33 deraadt 40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
50: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
51: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
53: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
54: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
55: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
56: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
57: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
58: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 59: */
1.1 deraadt 60:
61: #include "includes.h"
1.155 ! stevesk 62: RCSID("$OpenBSD: clientloop.c,v 1.154 2006/02/20 17:19:54 stevesk Exp $");
1.152 stevesk 63:
64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/types.h>
66: #include <sys/stat.h>
1.150 stevesk 67:
1.155 ! stevesk 68: #include <ctype.h>
1.151 stevesk 69: #include <paths.h>
1.153 stevesk 70: #include <signal.h>
1.150 stevesk 71: #include <termios.h>
1.1 deraadt 72:
1.45 markus 73: #include "ssh.h"
74: #include "ssh1.h"
75: #include "ssh2.h"
1.1 deraadt 76: #include "xmalloc.h"
77: #include "packet.h"
78: #include "buffer.h"
1.15 markus 79: #include "compat.h"
1.74 markus 80: #include "channels.h"
1.15 markus 81: #include "dispatch.h"
1.30 markus 82: #include "buffer.h"
83: #include "bufaux.h"
1.40 markus 84: #include "key.h"
1.54 markus 85: #include "kex.h"
1.45 markus 86: #include "log.h"
87: #include "readconf.h"
88: #include "clientloop.h"
1.147 djm 89: #include "sshconnect.h"
1.40 markus 90: #include "authfd.h"
1.45 markus 91: #include "atomicio.h"
1.118 deraadt 92: #include "sshpty.h"
1.63 markus 93: #include "misc.h"
1.123 djm 94: #include "monitor_fdpass.h"
95: #include "match.h"
96: #include "msg.h"
1.39 markus 97:
98: /* import options */
99: extern Options options;
100:
1.1 deraadt 101: /* Flag indicating that stdin should be redirected from /dev/null. */
102: extern int stdin_null_flag;
103:
1.116 dtucker 104: /* Flag indicating that no shell has been requested */
105: extern int no_shell_flag;
106:
1.123 djm 107: /* Control socket */
108: extern int control_fd;
109:
1.13 markus 110: /*
111: * Name of the host we are connecting to. This is the name given on the
112: * command line, or the HostName specified for the user-supplied name in a
113: * configuration file.
114: */
1.1 deraadt 115: extern char *host;
116:
1.13 markus 117: /*
118: * Flag to indicate that we have received a window change signal which has
119: * not yet been processed. This will cause a message indicating the new
120: * window size to be sent to the server a little later. This is volatile
121: * because this is updated in a signal handler.
122: */
1.88 markus 123: static volatile sig_atomic_t received_window_change_signal = 0;
124: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 125:
1.145 djm 126: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 127: static int in_non_blocking_mode = 0;
128:
129: /* Common data for the client loop code. */
1.31 markus 130: static int quit_pending; /* Set to non-zero to quit the client loop. */
131: static int escape_char; /* Escape character. */
1.11 markus 132: static int escape_pending; /* Last character was the escape character */
133: static int last_was_cr; /* Last character was a newline. */
134: static int exit_status; /* Used to store the exit status of the command. */
135: static int stdin_eof; /* EOF has been encountered on standard error. */
136: static Buffer stdin_buffer; /* Buffer for stdin data. */
137: static Buffer stdout_buffer; /* Buffer for stdout data. */
138: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 139: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
140: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 141: static int connection_in; /* Connection to server (input). */
142: static int connection_out; /* Connection to server (output). */
1.56 markus 143: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 144: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 145: static int server_alive_timeouts = 0;
1.1 deraadt 146:
1.77 itojun 147: static void client_init_dispatch(void);
1.16 markus 148: int session_ident = -1;
149:
1.123 djm 150: struct confirm_ctx {
151: int want_tty;
152: int want_subsys;
1.140 djm 153: int want_x_fwd;
154: int want_agent_fwd;
1.123 djm 155: Buffer cmd;
156: char *term;
157: struct termios tio;
1.126 djm 158: char **env;
1.123 djm 159: };
160:
1.54 markus 161: /*XXX*/
162: extern Kex *xxx_kex;
163:
1.123 djm 164: void ssh_process_session2_setup(int, int, int, Buffer *);
165:
1.1 deraadt 166: /* Restores stdin to blocking mode. */
167:
1.77 itojun 168: static void
1.49 itojun 169: leave_non_blocking(void)
1.1 deraadt 170: {
1.11 markus 171: if (in_non_blocking_mode) {
1.125 djm 172: unset_nonblock(fileno(stdin));
1.11 markus 173: in_non_blocking_mode = 0;
174: }
1.1 deraadt 175: }
176:
1.11 markus 177: /* Puts stdin terminal in non-blocking mode. */
178:
1.77 itojun 179: static void
1.49 itojun 180: enter_non_blocking(void)
1.1 deraadt 181: {
1.11 markus 182: in_non_blocking_mode = 1;
1.124 djm 183: set_nonblock(fileno(stdin));
1.1 deraadt 184: }
185:
1.13 markus 186: /*
187: * Signal handler for the window change signal (SIGWINCH). This just sets a
188: * flag indicating that the window has changed.
189: */
1.1 deraadt 190:
1.77 itojun 191: static void
1.11 markus 192: window_change_handler(int sig)
1.1 deraadt 193: {
1.11 markus 194: received_window_change_signal = 1;
195: signal(SIGWINCH, window_change_handler);
1.1 deraadt 196: }
197:
1.13 markus 198: /*
199: * Signal handler for signals that cause the program to terminate. These
200: * signals must be trapped to restore terminal modes.
201: */
1.1 deraadt 202:
1.77 itojun 203: static void
1.11 markus 204: signal_handler(int sig)
1.1 deraadt 205: {
1.75 markus 206: received_signal = sig;
207: quit_pending = 1;
1.1 deraadt 208: }
209:
1.13 markus 210: /*
211: * Returns current time in seconds from Jan 1, 1970 with the maximum
212: * available resolution.
213: */
1.1 deraadt 214:
1.77 itojun 215: static double
1.49 itojun 216: get_current_time(void)
1.1 deraadt 217: {
1.11 markus 218: struct timeval tv;
219: gettimeofday(&tv, NULL);
220: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 221: }
222:
223: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
224: void
225: client_x11_get_proto(const char *display, const char *xauth_path,
226: u_int trusted, char **_proto, char **_data)
227: {
228: char cmd[1024];
229: char line[512];
230: char xdisplay[512];
231: static char proto[512], data[512];
232: FILE *f;
233: int got_data = 0, generated = 0, do_unlink = 0, i;
234: char *xauthdir, *xauthfile;
235: struct stat st;
236:
237: xauthdir = xauthfile = NULL;
238: *_proto = proto;
239: *_data = data;
240: proto[0] = data[0] = '\0';
241:
242: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
243: debug("No xauth program.");
244: } else {
245: if (display == NULL) {
246: debug("x11_get_proto: DISPLAY not set");
247: return;
248: }
249: /*
250: * Handle FamilyLocal case where $DISPLAY does
251: * not match an authorization entry. For this we
252: * just try "xauth list unix:displaynum.screennum".
253: * XXX: "localhost" match to determine FamilyLocal
254: * is not perfect.
255: */
256: if (strncmp(display, "localhost:", 10) == 0) {
257: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
258: display + 10);
259: display = xdisplay;
260: }
261: if (trusted == 0) {
262: xauthdir = xmalloc(MAXPATHLEN);
263: xauthfile = xmalloc(MAXPATHLEN);
264: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
265: if (mkdtemp(xauthdir) != NULL) {
266: do_unlink = 1;
267: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
268: xauthdir);
269: snprintf(cmd, sizeof(cmd),
270: "%s -f %s generate %s " SSH_X11_PROTO
271: " untrusted timeout 1200 2>" _PATH_DEVNULL,
272: xauth_path, xauthfile, display);
273: debug2("x11_get_proto: %s", cmd);
274: if (system(cmd) == 0)
275: generated = 1;
276: }
277: }
278: snprintf(cmd, sizeof(cmd),
1.142 markus 279: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 280: xauth_path,
281: generated ? "-f " : "" ,
282: generated ? xauthfile : "",
283: display);
284: debug2("x11_get_proto: %s", cmd);
285: f = popen(cmd, "r");
286: if (f && fgets(line, sizeof(line), f) &&
287: sscanf(line, "%*s %511s %511s", proto, data) == 2)
288: got_data = 1;
289: if (f)
290: pclose(f);
291: }
292:
293: if (do_unlink) {
294: unlink(xauthfile);
295: rmdir(xauthdir);
296: }
297: if (xauthdir)
298: xfree(xauthdir);
299: if (xauthfile)
300: xfree(xauthfile);
301:
302: /*
303: * If we didn't get authentication data, just make up some
304: * data. The forwarding code will check the validity of the
305: * response anyway, and substitute this data. The X11
306: * server, however, will ignore this fake data and use
307: * whatever authentication mechanisms it was using otherwise
308: * for the local connection.
309: */
310: if (!got_data) {
311: u_int32_t rnd = 0;
312:
313: logit("Warning: No xauth data; "
314: "using fake authentication data for X11 forwarding.");
315: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
316: for (i = 0; i < 16; i++) {
317: if (i % 4 == 0)
318: rnd = arc4random();
319: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
320: rnd & 0xff);
321: rnd >>= 8;
322: }
323: }
1.1 deraadt 324: }
325:
1.13 markus 326: /*
327: * This is called when the interactive is entered. This checks if there is
328: * an EOF coming on stdin. We must check this explicitly, as select() does
329: * not appear to wake up when redirecting from /dev/null.
330: */
1.1 deraadt 331:
1.77 itojun 332: static void
1.49 itojun 333: client_check_initial_eof_on_stdin(void)
1.1 deraadt 334: {
1.11 markus 335: int len;
336: char buf[1];
1.1 deraadt 337:
1.13 markus 338: /*
339: * If standard input is to be "redirected from /dev/null", we simply
340: * mark that we have seen an EOF and send an EOF message to the
341: * server. Otherwise, we try to read a single character; it appears
342: * that for some files, such /dev/null, select() never wakes up for
343: * read for this descriptor, which means that we never get EOF. This
344: * way we will get the EOF if stdin comes from /dev/null or similar.
345: */
1.11 markus 346: if (stdin_null_flag) {
347: /* Fake EOF on stdin. */
348: debug("Sending eof.");
349: stdin_eof = 1;
350: packet_start(SSH_CMSG_EOF);
351: packet_send();
352: } else {
353: enter_non_blocking();
354:
355: /* Check for immediate EOF on stdin. */
356: len = read(fileno(stdin), buf, 1);
357: if (len == 0) {
1.13 markus 358: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 359: debug("Sending eof.");
360: stdin_eof = 1;
361: packet_start(SSH_CMSG_EOF);
362: packet_send();
363: } else if (len > 0) {
1.13 markus 364: /*
365: * Got data. We must store the data in the buffer,
366: * and also process it as an escape character if
367: * appropriate.
368: */
1.42 markus 369: if ((u_char) buf[0] == escape_char)
1.11 markus 370: escape_pending = 1;
1.52 markus 371: else
1.11 markus 372: buffer_append(&stdin_buffer, buf, 1);
373: }
374: leave_non_blocking();
375: }
1.1 deraadt 376: }
377:
378:
1.13 markus 379: /*
380: * Make packets from buffered stdin data, and buffer them for sending to the
381: * connection.
382: */
1.1 deraadt 383:
1.77 itojun 384: static void
1.49 itojun 385: client_make_packets_from_stdin_data(void)
1.1 deraadt 386: {
1.42 markus 387: u_int len;
1.1 deraadt 388:
1.11 markus 389: /* Send buffered stdin data to the server. */
390: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 391: packet_not_very_much_data_to_write()) {
1.11 markus 392: len = buffer_len(&stdin_buffer);
393: /* Keep the packets at reasonable size. */
394: if (len > packet_get_maxsize())
395: len = packet_get_maxsize();
396: packet_start(SSH_CMSG_STDIN_DATA);
397: packet_put_string(buffer_ptr(&stdin_buffer), len);
398: packet_send();
399: buffer_consume(&stdin_buffer, len);
1.52 markus 400: stdin_bytes += len;
1.11 markus 401: /* If we have a pending EOF, send it now. */
402: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
403: packet_start(SSH_CMSG_EOF);
404: packet_send();
405: }
1.1 deraadt 406: }
407: }
408:
1.13 markus 409: /*
410: * Checks if the client window has changed, and sends a packet about it to
411: * the server if so. The actual change is detected elsewhere (by a software
412: * interrupt on Unix); this just checks the flag and sends a message if
413: * appropriate.
414: */
1.1 deraadt 415:
1.77 itojun 416: static void
1.49 itojun 417: client_check_window_change(void)
1.1 deraadt 418: {
1.16 markus 419: struct winsize ws;
420:
421: if (! received_window_change_signal)
422: return;
423: /** XXX race */
424: received_window_change_signal = 0;
425:
1.37 markus 426: debug2("client_check_window_change: changed");
1.16 markus 427:
428: if (compat20) {
1.123 djm 429: channel_send_window_changes();
1.16 markus 430: } else {
1.123 djm 431: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
432: return;
1.16 markus 433: packet_start(SSH_CMSG_WINDOW_SIZE);
434: packet_put_int(ws.ws_row);
435: packet_put_int(ws.ws_col);
436: packet_put_int(ws.ws_xpixel);
437: packet_put_int(ws.ws_ypixel);
438: packet_send();
1.1 deraadt 439: }
440: }
441:
1.117 markus 442: static void
443: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
444: {
445: server_alive_timeouts = 0;
446: client_global_request_reply_fwd(type, seq, ctxt);
447: }
448:
449: static void
450: server_alive_check(void)
451: {
452: if (++server_alive_timeouts > options.server_alive_count_max)
453: packet_disconnect("Timeout, server not responding.");
454: packet_start(SSH2_MSG_GLOBAL_REQUEST);
455: packet_put_cstring("keepalive@openssh.com");
456: packet_put_char(1); /* boolean: want reply */
457: packet_send();
458: }
459:
1.13 markus 460: /*
461: * Waits until the client can do something (some data becomes available on
462: * one of the file descriptors).
463: */
1.77 itojun 464: static void
1.46 markus 465: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 466: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 467: {
1.117 markus 468: struct timeval tv, *tvp;
469: int ret;
470:
1.46 markus 471: /* Add any selections by the channel mechanism. */
1.81 markus 472: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 473:
1.16 markus 474: if (!compat20) {
1.17 markus 475: /* Read from the connection, unless our buffers are full. */
1.16 markus 476: if (buffer_len(&stdout_buffer) < buffer_high &&
477: buffer_len(&stderr_buffer) < buffer_high &&
478: channel_not_very_much_buffered_data())
1.46 markus 479: FD_SET(connection_in, *readsetp);
1.17 markus 480: /*
481: * Read from stdin, unless we have seen EOF or have very much
482: * buffered data to send to the server.
483: */
484: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 485: FD_SET(fileno(stdin), *readsetp);
1.17 markus 486:
487: /* Select stdout/stderr if have data in buffer. */
488: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 489: FD_SET(fileno(stdout), *writesetp);
1.17 markus 490: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 491: FD_SET(fileno(stderr), *writesetp);
1.16 markus 492: } else {
1.71 markus 493: /* channel_prepare_select could have closed the last channel */
1.84 markus 494: if (session_closed && !channel_still_open() &&
495: !packet_have_data_to_write()) {
496: /* clear mask since we did not call select() */
1.87 markus 497: memset(*readsetp, 0, *nallocp);
498: memset(*writesetp, 0, *nallocp);
1.84 markus 499: return;
1.71 markus 500: } else {
501: FD_SET(connection_in, *readsetp);
502: }
1.16 markus 503: }
1.11 markus 504:
505: /* Select server connection if have data to write to the server. */
506: if (packet_have_data_to_write())
1.46 markus 507: FD_SET(connection_out, *writesetp);
1.11 markus 508:
1.123 djm 509: if (control_fd != -1)
510: FD_SET(control_fd, *readsetp);
511:
1.13 markus 512: /*
513: * Wait for something to happen. This will suspend the process until
514: * some selected descriptor can be read, written, or has some other
1.117 markus 515: * event pending.
1.13 markus 516: */
1.11 markus 517:
1.117 markus 518: if (options.server_alive_interval == 0 || !compat20)
519: tvp = NULL;
1.129 deraadt 520: else {
1.117 markus 521: tv.tv_sec = options.server_alive_interval;
522: tv.tv_usec = 0;
523: tvp = &tv;
524: }
525: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
526: if (ret < 0) {
1.11 markus 527: char buf[100];
1.51 markus 528:
529: /*
530: * We have to clear the select masks, because we return.
531: * We have to return, because the mainloop checks for the flags
532: * set by the signal handlers.
533: */
1.87 markus 534: memset(*readsetp, 0, *nallocp);
535: memset(*writesetp, 0, *nallocp);
1.50 deraadt 536:
1.11 markus 537: if (errno == EINTR)
538: return;
539: /* Note: we might still have data in the buffers. */
540: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
541: buffer_append(&stderr_buffer, buf, strlen(buf));
542: quit_pending = 1;
1.117 markus 543: } else if (ret == 0)
544: server_alive_check();
1.11 markus 545: }
546:
1.77 itojun 547: static void
1.31 markus 548: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 549: {
1.11 markus 550: /* Flush stdout and stderr buffers. */
1.31 markus 551: if (buffer_len(bout) > 0)
1.112 deraadt 552: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 553: if (buffer_len(berr) > 0)
1.112 deraadt 554: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 555:
556: leave_raw_mode();
557:
1.13 markus 558: /*
559: * Free (and clear) the buffer to reduce the amount of data that gets
560: * written to swap.
561: */
1.31 markus 562: buffer_free(bin);
563: buffer_free(bout);
564: buffer_free(berr);
1.11 markus 565:
566: /* Send the suspend signal to the program itself. */
567: kill(getpid(), SIGTSTP);
568:
1.132 djm 569: /* Reset window sizes in case they have changed */
570: received_window_change_signal = 1;
1.11 markus 571:
572: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 573: buffer_init(bin);
574: buffer_init(bout);
575: buffer_init(berr);
1.11 markus 576:
577: enter_raw_mode();
578: }
579:
1.77 itojun 580: static void
1.17 markus 581: client_process_net_input(fd_set * readset)
1.11 markus 582: {
1.17 markus 583: int len;
584: char buf[8192];
1.11 markus 585:
1.13 markus 586: /*
587: * Read input from the server, and add any such data to the buffer of
588: * the packet subsystem.
589: */
1.11 markus 590: if (FD_ISSET(connection_in, readset)) {
591: /* Read as much as possible. */
592: len = read(connection_in, buf, sizeof(buf));
593: if (len == 0) {
594: /* Received EOF. The remote host has closed the connection. */
595: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
596: host);
1.1 deraadt 597: buffer_append(&stderr_buffer, buf, strlen(buf));
598: quit_pending = 1;
599: return;
1.11 markus 600: }
1.13 markus 601: /*
602: * There is a kernel bug on Solaris that causes select to
603: * sometimes wake up even though there is no data available.
604: */
1.53 millert 605: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 606: len = 0;
607:
608: if (len < 0) {
609: /* An error has encountered. Perhaps there is a network problem. */
610: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
611: host, strerror(errno));
612: buffer_append(&stderr_buffer, buf, strlen(buf));
613: quit_pending = 1;
614: return;
615: }
616: packet_process_incoming(buf, len);
617: }
1.17 markus 618: }
1.16 markus 619:
1.97 jakob 620: static void
1.123 djm 621: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
622: {
623: int id;
624: Channel *c;
1.129 deraadt 625:
1.123 djm 626: id = packet_get_int();
627: packet_check_eom();
628:
629: if ((c = channel_lookup(id)) == NULL) {
630: error("%s: no channel for id %d", __func__, id);
631: return;
632: }
633:
634: if (type == SSH2_MSG_CHANNEL_SUCCESS)
635: debug2("Request suceeded on channel %d", id);
636: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
637: error("Request failed on channel %d", id);
638: channel_free(c);
639: }
640: }
641:
642: static void
643: client_extra_session2_setup(int id, void *arg)
644: {
645: struct confirm_ctx *cctx = arg;
1.140 djm 646: const char *display;
1.123 djm 647: Channel *c;
1.126 djm 648: int i;
1.129 deraadt 649:
1.123 djm 650: if (cctx == NULL)
651: fatal("%s: cctx == NULL", __func__);
652: if ((c = channel_lookup(id)) == NULL)
653: fatal("%s: no channel for id %d", __func__, id);
654:
1.141 djm 655: display = getenv("DISPLAY");
1.140 djm 656: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
657: char *proto, *data;
658: /* Get reasonable local authentication information. */
659: client_x11_get_proto(display, options.xauth_location,
660: options.forward_x11_trusted, &proto, &data);
661: /* Request forwarding with authentication spoofing. */
662: debug("Requesting X11 forwarding with authentication spoofing.");
663: x11_request_forwarding_with_spoofing(id, display, proto, data);
664: /* XXX wait for reply */
665: }
666:
667: if (cctx->want_agent_fwd && options.forward_agent) {
668: debug("Requesting authentication agent forwarding.");
669: channel_request_start(id, "auth-agent-req@openssh.com", 0);
670: packet_send();
671: }
672:
1.129 deraadt 673: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 674: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 675: client_subsystem_reply);
1.127 djm 676:
1.123 djm 677: c->confirm_ctx = NULL;
678: buffer_free(&cctx->cmd);
1.126 djm 679: xfree(cctx->term);
680: if (cctx->env != NULL) {
681: for (i = 0; cctx->env[i] != NULL; i++)
682: xfree(cctx->env[i]);
683: xfree(cctx->env);
1.129 deraadt 684: }
1.126 djm 685: xfree(cctx);
1.123 djm 686: }
687:
688: static void
689: client_process_control(fd_set * readset)
690: {
691: Buffer m;
692: Channel *c;
1.139 djm 693: int client_fd, new_fd[3], ver, allowed;
1.123 djm 694: socklen_t addrlen;
695: struct sockaddr_storage addr;
696: struct confirm_ctx *cctx;
697: char *cmd;
1.139 djm 698: u_int i, len, env_len, command, flags;
1.123 djm 699: uid_t euid;
700: gid_t egid;
701:
702: /*
703: * Accept connection on control socket
704: */
705: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
706: return;
707:
708: memset(&addr, 0, sizeof(addr));
709: addrlen = sizeof(addr);
710: if ((client_fd = accept(control_fd,
711: (struct sockaddr*)&addr, &addrlen)) == -1) {
712: error("%s accept: %s", __func__, strerror(errno));
713: return;
714: }
715:
716: if (getpeereid(client_fd, &euid, &egid) < 0) {
717: error("%s getpeereid failed: %s", __func__, strerror(errno));
718: close(client_fd);
719: return;
720: }
721: if ((euid != 0) && (getuid() != euid)) {
722: error("control mode uid mismatch: peer euid %u != uid %u",
723: (u_int) euid, (u_int) getuid());
724: close(client_fd);
725: return;
726: }
1.127 djm 727:
1.134 djm 728: unset_nonblock(client_fd);
729:
730: /* Read command */
731: buffer_init(&m);
732: if (ssh_msg_recv(client_fd, &m) == -1) {
733: error("%s: client msg_recv failed", __func__);
734: close(client_fd);
735: buffer_free(&m);
736: return;
737: }
1.140 djm 738: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 739: error("%s: wrong client version %d", __func__, ver);
740: buffer_free(&m);
741: close(client_fd);
742: return;
743: }
744:
1.127 djm 745: allowed = 1;
1.134 djm 746: command = buffer_get_int(&m);
747: flags = buffer_get_int(&m);
1.123 djm 748:
1.134 djm 749: buffer_clear(&m);
1.123 djm 750:
1.134 djm 751: switch (command) {
752: case SSHMUX_COMMAND_OPEN:
1.137 djm 753: if (options.control_master == SSHCTL_MASTER_ASK ||
754: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 755: allowed = ask_permission("Allow shared connection "
756: "to %s? ", host);
757: /* continue below */
758: break;
759: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 760: if (options.control_master == SSHCTL_MASTER_ASK ||
761: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 762: allowed = ask_permission("Terminate shared connection "
763: "to %s? ", host);
764: if (allowed)
765: quit_pending = 1;
1.136 deraadt 766: /* FALLTHROUGH */
1.134 djm 767: case SSHMUX_COMMAND_ALIVE_CHECK:
768: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
769: buffer_clear(&m);
770: buffer_put_int(&m, allowed);
771: buffer_put_int(&m, getpid());
1.140 djm 772: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 773: error("%s: client msg_send failed", __func__);
774: close(client_fd);
775: buffer_free(&m);
776: return;
777: }
778: buffer_free(&m);
779: close(client_fd);
780: return;
781: default:
782: error("Unsupported command %d", command);
783: buffer_free(&m);
784: close(client_fd);
785: return;
786: }
1.123 djm 787:
1.134 djm 788: /* Reply for SSHMUX_COMMAND_OPEN */
789: buffer_clear(&m);
1.127 djm 790: buffer_put_int(&m, allowed);
1.123 djm 791: buffer_put_int(&m, getpid());
1.140 djm 792: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 793: error("%s: client msg_send failed", __func__);
794: close(client_fd);
1.127 djm 795: buffer_free(&m);
1.123 djm 796: return;
797: }
798:
1.127 djm 799: if (!allowed) {
800: error("Refused control connection");
801: close(client_fd);
802: buffer_free(&m);
803: return;
804: }
805:
1.134 djm 806: buffer_clear(&m);
1.123 djm 807: if (ssh_msg_recv(client_fd, &m) == -1) {
808: error("%s: client msg_recv failed", __func__);
809: close(client_fd);
1.127 djm 810: buffer_free(&m);
1.123 djm 811: return;
812: }
1.140 djm 813: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 814: error("%s: wrong client version %d", __func__, ver);
815: buffer_free(&m);
816: close(client_fd);
817: return;
818: }
819:
820: cctx = xmalloc(sizeof(*cctx));
821: memset(cctx, 0, sizeof(*cctx));
1.134 djm 822: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
823: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 824: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
825: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 826: cctx->term = buffer_get_string(&m, &len);
827:
828: cmd = buffer_get_string(&m, &len);
829: buffer_init(&cctx->cmd);
830: buffer_append(&cctx->cmd, cmd, strlen(cmd));
831:
1.126 djm 832: env_len = buffer_get_int(&m);
833: env_len = MIN(env_len, 4096);
834: debug3("%s: receiving %d env vars", __func__, env_len);
835: if (env_len != 0) {
836: cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
837: for (i = 0; i < env_len; i++)
838: cctx->env[i] = buffer_get_string(&m, &len);
839: cctx->env[i] = NULL;
840: }
841:
1.123 djm 842: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
843: cctx->want_tty, cctx->want_subsys, cmd);
844:
845: /* Gather fds from client */
846: new_fd[0] = mm_receive_fd(client_fd);
847: new_fd[1] = mm_receive_fd(client_fd);
848: new_fd[2] = mm_receive_fd(client_fd);
849:
850: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
851: new_fd[0], new_fd[1], new_fd[2]);
852:
853: /* Try to pick up ttymodes from client before it goes raw */
854: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
855: error("%s: tcgetattr: %s", __func__, strerror(errno));
856:
1.134 djm 857: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 858: buffer_clear(&m);
1.140 djm 859: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 860: error("%s: client msg_send failed", __func__);
861: close(client_fd);
862: close(new_fd[0]);
863: close(new_fd[1]);
864: close(new_fd[2]);
1.127 djm 865: buffer_free(&m);
1.134 djm 866: xfree(cctx->term);
867: if (env_len != 0) {
868: for (i = 0; i < env_len; i++)
869: xfree(cctx->env[i]);
870: xfree(cctx->env);
871: }
1.123 djm 872: return;
873: }
874: buffer_free(&m);
875:
876: /* enable nonblocking unless tty */
877: if (!isatty(new_fd[0]))
878: set_nonblock(new_fd[0]);
879: if (!isatty(new_fd[1]))
880: set_nonblock(new_fd[1]);
881: if (!isatty(new_fd[2]))
882: set_nonblock(new_fd[2]);
883:
884: set_nonblock(client_fd);
885:
1.129 deraadt 886: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 887: new_fd[0], new_fd[1], new_fd[2],
888: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
889: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
890:
891: /* XXX */
892: c->ctl_fd = client_fd;
893:
894: debug3("%s: channel_new: %d", __func__, c->self);
895:
896: channel_send_open(c->self);
897: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
898: }
899:
900: static void
1.99 markus 901: process_cmdline(void)
1.97 jakob 902: {
903: void (*handler)(int);
1.135 djm 904: char *s, *cmd, *cancel_host;
1.121 djm 905: int delete = 0;
1.97 jakob 906: int local = 0;
1.135 djm 907: u_short cancel_port;
908: Forward fwd;
1.97 jakob 909:
910: leave_raw_mode();
1.101 markus 911: handler = signal(SIGINT, SIG_IGN);
1.99 markus 912: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 913: if (s == NULL)
914: goto out;
915: while (*s && isspace(*s))
916: s++;
1.121 djm 917: if (*s == '-')
918: s++; /* Skip cmdline '-', if any */
1.120 dtucker 919: if (*s == '\0')
1.97 jakob 920: goto out;
1.121 djm 921:
1.122 djm 922: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 923: logit("Commands:");
924: logit(" -Lport:host:hostport Request local forward");
925: logit(" -Rport:host:hostport Request remote forward");
926: logit(" -KRhostport Cancel remote forward");
1.146 reyk 927: if (!options.permit_local_command)
928: goto out;
929: logit(" !args Execute local command");
930: goto out;
931: }
932:
933: if (*s == '!' && options.permit_local_command) {
934: s++;
935: ssh_local_cmd(s);
1.121 djm 936: goto out;
937: }
938:
939: if (*s == 'K') {
940: delete = 1;
941: s++;
942: }
943: if (*s != 'L' && *s != 'R') {
1.109 itojun 944: logit("Invalid command.");
1.97 jakob 945: goto out;
946: }
1.121 djm 947: if (*s == 'L')
1.97 jakob 948: local = 1;
1.121 djm 949: if (local && delete) {
950: logit("Not supported.");
951: goto out;
952: }
953: if ((!local || delete) && !compat20) {
1.109 itojun 954: logit("Not supported for SSH protocol version 1.");
1.97 jakob 955: goto out;
956: }
1.121 djm 957:
958: s++;
1.97 jakob 959: while (*s && isspace(*s))
960: s++;
961:
1.121 djm 962: if (delete) {
1.135 djm 963: cancel_port = 0;
964: cancel_host = hpdelim(&s); /* may be NULL */
965: if (s != NULL) {
966: cancel_port = a2port(s);
967: cancel_host = cleanhostname(cancel_host);
968: } else {
969: cancel_port = a2port(cancel_host);
970: cancel_host = NULL;
1.121 djm 971: }
1.135 djm 972: if (cancel_port == 0) {
973: logit("Bad forwarding close port");
1.121 djm 974: goto out;
975: }
1.135 djm 976: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 977: } else {
1.135 djm 978: if (!parse_forward(&fwd, s)) {
1.121 djm 979: logit("Bad forwarding specification.");
980: goto out;
981: }
982: if (local) {
1.135 djm 983: if (channel_setup_local_fwd_listener(fwd.listen_host,
984: fwd.listen_port, fwd.connect_host,
985: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 986: logit("Port forwarding failed.");
987: goto out;
988: }
1.135 djm 989: } else {
990: channel_request_remote_forwarding(fwd.listen_host,
991: fwd.listen_port, fwd.connect_host,
992: fwd.connect_port);
993: }
994:
1.121 djm 995: logit("Forwarding port.");
996: }
997:
1.97 jakob 998: out:
999: signal(SIGINT, handler);
1000: enter_raw_mode();
1001: if (cmd)
1002: xfree(cmd);
1003: }
1004:
1.31 markus 1005: /* process the characters one by one */
1.77 itojun 1006: static int
1.31 markus 1007: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1008: {
1.32 markus 1009: char string[1024];
1.31 markus 1010: pid_t pid;
1011: int bytes = 0;
1.42 markus 1012: u_int i;
1013: u_char ch;
1.31 markus 1014: char *s;
1015:
1.139 djm 1016: if (len <= 0)
1017: return (0);
1018:
1019: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1020: /* Get one character at a time. */
1021: ch = buf[i];
1022:
1023: if (escape_pending) {
1024: /* We have previously seen an escape character. */
1025: /* Clear the flag now. */
1026: escape_pending = 0;
1027:
1028: /* Process the escaped character. */
1029: switch (ch) {
1030: case '.':
1031: /* Terminate the connection. */
1.32 markus 1032: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1033: buffer_append(berr, string, strlen(string));
1.31 markus 1034:
1035: quit_pending = 1;
1036: return -1;
1037:
1038: case 'Z' - 64:
1039: /* Suspend the program. */
1040: /* Print a message to that effect to the user. */
1.32 markus 1041: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1042: buffer_append(berr, string, strlen(string));
1.31 markus 1043:
1044: /* Restore terminal modes and suspend. */
1045: client_suspend_self(bin, bout, berr);
1046:
1047: /* We have been continued. */
1048: continue;
1049:
1.111 markus 1050: case 'B':
1051: if (compat20) {
1052: snprintf(string, sizeof string,
1053: "%cB\r\n", escape_char);
1054: buffer_append(berr, string,
1055: strlen(string));
1056: channel_request_start(session_ident,
1057: "break", 0);
1058: packet_put_int(1000);
1059: packet_send();
1060: }
1061: continue;
1062:
1.54 markus 1063: case 'R':
1.59 markus 1064: if (compat20) {
1065: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1066: logit("Server does not support re-keying");
1.59 markus 1067: else
1068: need_rekeying = 1;
1069: }
1.54 markus 1070: continue;
1071:
1.31 markus 1072: case '&':
1073: /*
1074: * Detach the program (continue to serve connections,
1075: * but put in background and no more new connections).
1076: */
1077: /* Restore tty modes. */
1078: leave_raw_mode();
1079:
1080: /* Stop listening for new connections. */
1.86 markus 1081: channel_stop_listening();
1.31 markus 1082:
1.86 markus 1083: snprintf(string, sizeof string,
1084: "%c& [backgrounded]\n", escape_char);
1085: buffer_append(berr, string, strlen(string));
1.31 markus 1086:
1087: /* Fork into background. */
1088: pid = fork();
1089: if (pid < 0) {
1090: error("fork: %.100s", strerror(errno));
1091: continue;
1092: }
1093: if (pid != 0) { /* This is the parent. */
1094: /* The parent just exits. */
1095: exit(0);
1096: }
1097: /* The child continues serving connections. */
1.86 markus 1098: if (compat20) {
1099: buffer_append(bin, "\004", 1);
1100: /* fake EOF on stdin */
1101: return -1;
1102: } else if (!stdin_eof) {
1103: /*
1104: * Sending SSH_CMSG_EOF alone does not always appear
1105: * to be enough. So we try to send an EOF character
1106: * first.
1107: */
1108: packet_start(SSH_CMSG_STDIN_DATA);
1109: packet_put_string("\004", 1);
1110: packet_send();
1111: /* Close stdin. */
1112: stdin_eof = 1;
1113: if (buffer_len(bin) == 0) {
1114: packet_start(SSH_CMSG_EOF);
1115: packet_send();
1116: }
1117: }
1118: continue;
1.31 markus 1119:
1120: case '?':
1.32 markus 1121: snprintf(string, sizeof string,
1.31 markus 1122: "%c?\r\n\
1123: Supported escape sequences:\r\n\
1.104 stevesk 1124: %c. - terminate connection\r\n\
1.111 markus 1125: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1126: %cC - open a command line\r\n\
1127: %cR - Request rekey (SSH protocol 2 only)\r\n\
1128: %c^Z - suspend ssh\r\n\
1129: %c# - list forwarded connections\r\n\
1130: %c& - background ssh (when waiting for connections to terminate)\r\n\
1131: %c? - this message\r\n\
1132: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1133: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1134: escape_char, escape_char, escape_char, escape_char,
1135: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1136: escape_char, escape_char, escape_char);
1.32 markus 1137: buffer_append(berr, string, strlen(string));
1.31 markus 1138: continue;
1139:
1140: case '#':
1.32 markus 1141: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1142: buffer_append(berr, string, strlen(string));
1.31 markus 1143: s = channel_open_message();
1144: buffer_append(berr, s, strlen(s));
1145: xfree(s);
1.97 jakob 1146: continue;
1147:
1148: case 'C':
1.99 markus 1149: process_cmdline();
1.31 markus 1150: continue;
1151:
1152: default:
1153: if (ch != escape_char) {
1154: buffer_put_char(bin, escape_char);
1155: bytes++;
1156: }
1157: /* Escaped characters fall through here */
1158: break;
1159: }
1160: } else {
1161: /*
1162: * The previous character was not an escape char. Check if this
1163: * is an escape.
1164: */
1165: if (last_was_cr && ch == escape_char) {
1166: /* It is. Set the flag and continue to next character. */
1167: escape_pending = 1;
1168: continue;
1169: }
1170: }
1171:
1172: /*
1173: * Normal character. Record whether it was a newline,
1174: * and append it to the buffer.
1175: */
1176: last_was_cr = (ch == '\r' || ch == '\n');
1177: buffer_put_char(bin, ch);
1178: bytes++;
1179: }
1180: return bytes;
1181: }
1182:
1.77 itojun 1183: static void
1.17 markus 1184: client_process_input(fd_set * readset)
1185: {
1.21 deraadt 1186: int len;
1.31 markus 1187: char buf[8192];
1.16 markus 1188:
1.11 markus 1189: /* Read input from stdin. */
1190: if (FD_ISSET(fileno(stdin), readset)) {
1191: /* Read as much as possible. */
1192: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1193: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1194: return; /* we'll try again later */
1.11 markus 1195: if (len <= 0) {
1.13 markus 1196: /*
1197: * Received EOF or error. They are treated
1198: * similarly, except that an error message is printed
1199: * if it was an error condition.
1200: */
1.11 markus 1201: if (len < 0) {
1202: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1203: buffer_append(&stderr_buffer, buf, strlen(buf));
1204: }
1205: /* Mark that we have seen EOF. */
1206: stdin_eof = 1;
1.13 markus 1207: /*
1208: * Send an EOF message to the server unless there is
1209: * data in the buffer. If there is data in the
1210: * buffer, no message will be sent now. Code
1211: * elsewhere will send the EOF when the buffer
1212: * becomes empty if stdin_eof is set.
1213: */
1.11 markus 1214: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1215: packet_start(SSH_CMSG_EOF);
1216: packet_send();
1.11 markus 1217: }
1.72 stevesk 1218: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1219: /*
1220: * Normal successful read, and no escape character.
1221: * Just append the data to buffer.
1222: */
1.11 markus 1223: buffer_append(&stdin_buffer, buf, len);
1224: } else {
1.13 markus 1225: /*
1226: * Normal, successful read. But we have an escape character
1227: * and have to process the characters one by one.
1228: */
1.52 markus 1229: if (process_escapes(&stdin_buffer, &stdout_buffer,
1230: &stderr_buffer, buf, len) == -1)
1.31 markus 1231: return;
1.11 markus 1232: }
1233: }
1234: }
1235:
1.77 itojun 1236: static void
1.11 markus 1237: client_process_output(fd_set * writeset)
1238: {
1239: int len;
1240: char buf[100];
1.1 deraadt 1241:
1.11 markus 1242: /* Write buffered output to stdout. */
1243: if (FD_ISSET(fileno(stdout), writeset)) {
1244: /* Write as much data as possible. */
1245: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1246: buffer_len(&stdout_buffer));
1.11 markus 1247: if (len <= 0) {
1.64 markus 1248: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1249: len = 0;
1250: else {
1.13 markus 1251: /*
1252: * An error or EOF was encountered. Put an
1253: * error message to stderr buffer.
1254: */
1.11 markus 1255: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1256: buffer_append(&stderr_buffer, buf, strlen(buf));
1257: quit_pending = 1;
1258: return;
1259: }
1260: }
1261: /* Consume printed data from the buffer. */
1262: buffer_consume(&stdout_buffer, len);
1.57 markus 1263: stdout_bytes += len;
1.11 markus 1264: }
1265: /* Write buffered output to stderr. */
1266: if (FD_ISSET(fileno(stderr), writeset)) {
1267: /* Write as much data as possible. */
1268: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1269: buffer_len(&stderr_buffer));
1.11 markus 1270: if (len <= 0) {
1.64 markus 1271: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1272: len = 0;
1273: else {
1.13 markus 1274: /* EOF or error, but can't even print error message. */
1.11 markus 1275: quit_pending = 1;
1276: return;
1277: }
1278: }
1279: /* Consume printed characters from the buffer. */
1280: buffer_consume(&stderr_buffer, len);
1.57 markus 1281: stderr_bytes += len;
1.11 markus 1282: }
1.1 deraadt 1283: }
1284:
1.13 markus 1285: /*
1.15 markus 1286: * Get packets from the connection input buffer, and process them as long as
1287: * there are packets available.
1288: *
1289: * Any unknown packets received during the actual
1290: * session cause the session to terminate. This is
1291: * intended to make debugging easier since no
1292: * confirmations are sent. Any compatible protocol
1293: * extensions must be negotiated during the
1294: * preparatory phase.
1295: */
1296:
1.77 itojun 1297: static void
1.49 itojun 1298: client_process_buffered_input_packets(void)
1.15 markus 1299: {
1.54 markus 1300: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1301: }
1302:
1.31 markus 1303: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1304:
1.77 itojun 1305: static int
1.31 markus 1306: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1307: {
1.31 markus 1308: /* XXX we assume c->extended is writeable */
1309: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1310: }
1311:
1.77 itojun 1312: static void
1.60 markus 1313: client_channel_closed(int id, void *arg)
1314: {
1.83 markus 1315: channel_cancel_cleanup(id);
1.60 markus 1316: session_closed = 1;
1.113 markus 1317: leave_raw_mode();
1.60 markus 1318: }
1319:
1.15 markus 1320: /*
1.13 markus 1321: * Implements the interactive session with the server. This is called after
1322: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1323: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1324: * used as an escape character for terminating or suspending the session.
1.13 markus 1325: */
1.1 deraadt 1326:
1.20 markus 1327: int
1.30 markus 1328: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1329: {
1.46 markus 1330: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1331: double start_time, total_time;
1.130 avsm 1332: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1333: u_int nalloc = 0;
1.11 markus 1334: char buf[100];
1335:
1336: debug("Entering interactive session.");
1337:
1338: start_time = get_current_time();
1339:
1340: /* Initialize variables. */
1341: escape_pending = 0;
1342: last_was_cr = 1;
1343: exit_status = -1;
1344: stdin_eof = 0;
1345: buffer_high = 64 * 1024;
1346: connection_in = packet_get_connection_in();
1347: connection_out = packet_get_connection_out();
1.46 markus 1348: max_fd = MAX(connection_in, connection_out);
1.123 djm 1349: if (control_fd != -1)
1350: max_fd = MAX(max_fd, control_fd);
1.46 markus 1351:
1352: if (!compat20) {
1.63 markus 1353: /* enable nonblocking unless tty */
1354: if (!isatty(fileno(stdin)))
1355: set_nonblock(fileno(stdin));
1356: if (!isatty(fileno(stdout)))
1357: set_nonblock(fileno(stdout));
1358: if (!isatty(fileno(stderr)))
1359: set_nonblock(fileno(stderr));
1.46 markus 1360: max_fd = MAX(max_fd, fileno(stdin));
1361: max_fd = MAX(max_fd, fileno(stdout));
1362: max_fd = MAX(max_fd, fileno(stderr));
1363: }
1.11 markus 1364: stdin_bytes = 0;
1365: stdout_bytes = 0;
1366: stderr_bytes = 0;
1367: quit_pending = 0;
1368: escape_char = escape_char_arg;
1369:
1370: /* Initialize buffers. */
1371: buffer_init(&stdin_buffer);
1372: buffer_init(&stdout_buffer);
1373: buffer_init(&stderr_buffer);
1374:
1.15 markus 1375: client_init_dispatch();
1376:
1.105 markus 1377: /*
1378: * Set signal handlers, (e.g. to restore non-blocking mode)
1379: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1380: */
1.131 djm 1381: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1382: signal(SIGHUP, signal_handler);
1.105 markus 1383: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1384: signal(SIGINT, signal_handler);
1385: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1386: signal(SIGQUIT, signal_handler);
1387: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1388: signal(SIGTERM, signal_handler);
1.132 djm 1389: signal(SIGWINCH, window_change_handler);
1.11 markus 1390:
1391: if (have_pty)
1392: enter_raw_mode();
1393:
1.48 markus 1394: if (compat20) {
1395: session_ident = ssh2_chan_id;
1.72 stevesk 1396: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1397: channel_register_filter(session_ident,
1.149 reyk 1398: simple_escape_filter, NULL);
1.60 markus 1399: if (session_ident != -1)
1400: channel_register_cleanup(session_ident,
1.143 djm 1401: client_channel_closed, 0);
1.48 markus 1402: } else {
1403: /* Check if we should immediately send eof on stdin. */
1.16 markus 1404: client_check_initial_eof_on_stdin();
1.48 markus 1405: }
1.30 markus 1406:
1.11 markus 1407: /* Main loop of the client for the interactive session mode. */
1408: while (!quit_pending) {
1409:
1.13 markus 1410: /* Process buffered packets sent by the server. */
1.11 markus 1411: client_process_buffered_input_packets();
1412:
1.60 markus 1413: if (compat20 && session_closed && !channel_still_open())
1414: break;
1415:
1.56 markus 1416: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1417:
1.56 markus 1418: if (rekeying) {
1419: debug("rekeying in progress");
1420: } else {
1421: /*
1422: * Make packets of buffered stdin data, and buffer
1423: * them for sending to the server.
1424: */
1425: if (!compat20)
1426: client_make_packets_from_stdin_data();
1.11 markus 1427:
1.56 markus 1428: /*
1429: * Make packets from buffered channel data, and
1430: * enqueue them for sending to the server.
1431: */
1432: if (packet_not_very_much_data_to_write())
1433: channel_output_poll();
1.11 markus 1434:
1.56 markus 1435: /*
1436: * Check if the window size has changed, and buffer a
1437: * message about it to the server if so.
1438: */
1439: client_check_window_change();
1.11 markus 1440:
1.56 markus 1441: if (quit_pending)
1442: break;
1443: }
1.13 markus 1444: /*
1445: * Wait until we have something to do (something becomes
1446: * available on one of the descriptors).
1447: */
1.81 markus 1448: max_fd2 = max_fd;
1.56 markus 1449: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1450: &max_fd2, &nalloc, rekeying);
1.11 markus 1451:
1452: if (quit_pending)
1453: break;
1454:
1.56 markus 1455: /* Do channel operations unless rekeying in progress. */
1456: if (!rekeying) {
1457: channel_after_select(readset, writeset);
1.108 markus 1458: if (need_rekeying || packet_need_rekeying()) {
1459: debug("need rekeying");
1.56 markus 1460: xxx_kex->done = 0;
1461: kex_send_kexinit(xxx_kex);
1462: need_rekeying = 0;
1463: }
1464: }
1.11 markus 1465:
1.17 markus 1466: /* Buffer input from the connection. */
1.46 markus 1467: client_process_net_input(readset);
1.17 markus 1468:
1.123 djm 1469: /* Accept control connections. */
1470: client_process_control(readset);
1471:
1.17 markus 1472: if (quit_pending)
1473: break;
1.11 markus 1474:
1.17 markus 1475: if (!compat20) {
1476: /* Buffer data from stdin */
1.46 markus 1477: client_process_input(readset);
1.17 markus 1478: /*
1479: * Process output to stdout and stderr. Output to
1480: * the connection is processed elsewhere (above).
1481: */
1.46 markus 1482: client_process_output(writeset);
1.17 markus 1483: }
1.11 markus 1484:
1.13 markus 1485: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1486: if (FD_ISSET(connection_out, writeset))
1.11 markus 1487: packet_write_poll();
1488: }
1.46 markus 1489: if (readset)
1490: xfree(readset);
1491: if (writeset)
1492: xfree(writeset);
1.11 markus 1493:
1494: /* Terminate the session. */
1495:
1496: /* Stop watching for window change. */
1.132 djm 1497: signal(SIGWINCH, SIG_DFL);
1.11 markus 1498:
1.76 markus 1499: channel_free_all();
1.11 markus 1500:
1.75 markus 1501: if (have_pty)
1502: leave_raw_mode();
1503:
1504: /* restore blocking io */
1505: if (!isatty(fileno(stdin)))
1506: unset_nonblock(fileno(stdin));
1507: if (!isatty(fileno(stdout)))
1508: unset_nonblock(fileno(stdout));
1509: if (!isatty(fileno(stderr)))
1510: unset_nonblock(fileno(stderr));
1.116 dtucker 1511:
1512: /*
1513: * If there was no shell or command requested, there will be no remote
1514: * exit status to be returned. In that case, clear error code if the
1515: * connection was deliberately terminated at this end.
1516: */
1517: if (no_shell_flag && received_signal == SIGTERM) {
1518: received_signal = 0;
1519: exit_status = 0;
1520: }
1.75 markus 1521:
1.113 markus 1522: if (received_signal)
1.89 itojun 1523: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1524:
1.13 markus 1525: /*
1526: * In interactive mode (with pseudo tty) display a message indicating
1527: * that the connection has been closed.
1528: */
1.11 markus 1529: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1530: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1531: buffer_append(&stderr_buffer, buf, strlen(buf));
1532: }
1.70 markus 1533:
1.11 markus 1534: /* Output any buffered data for stdout. */
1.70 markus 1535: while (buffer_len(&stdout_buffer) > 0) {
1536: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1537: buffer_len(&stdout_buffer));
1.70 markus 1538: if (len <= 0) {
1.11 markus 1539: error("Write failed flushing stdout buffer.");
1.70 markus 1540: break;
1541: }
1.11 markus 1542: buffer_consume(&stdout_buffer, len);
1.57 markus 1543: stdout_bytes += len;
1.11 markus 1544: }
1545:
1546: /* Output any buffered data for stderr. */
1.70 markus 1547: while (buffer_len(&stderr_buffer) > 0) {
1548: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1549: buffer_len(&stderr_buffer));
1.70 markus 1550: if (len <= 0) {
1.11 markus 1551: error("Write failed flushing stderr buffer.");
1.70 markus 1552: break;
1553: }
1.11 markus 1554: buffer_consume(&stderr_buffer, len);
1.57 markus 1555: stderr_bytes += len;
1.11 markus 1556: }
1557:
1558: /* Clear and free any buffers. */
1559: memset(buf, 0, sizeof(buf));
1560: buffer_free(&stdin_buffer);
1561: buffer_free(&stdout_buffer);
1562: buffer_free(&stderr_buffer);
1563:
1564: /* Report bytes transferred, and transfer rates. */
1565: total_time = get_current_time() - start_time;
1566: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1567: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1568: if (total_time > 0)
1569: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1570: stdin_bytes / total_time, stdout_bytes / total_time,
1571: stderr_bytes / total_time);
1.11 markus 1572:
1573: /* Return the exit status of the program. */
1574: debug("Exit status %d", exit_status);
1575: return exit_status;
1.15 markus 1576: }
1577:
1578: /*********/
1579:
1.77 itojun 1580: static void
1.94 markus 1581: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1582: {
1.42 markus 1583: u_int data_len;
1.15 markus 1584: char *data = packet_get_string(&data_len);
1.93 markus 1585: packet_check_eom();
1.15 markus 1586: buffer_append(&stdout_buffer, data, data_len);
1587: memset(data, 0, data_len);
1588: xfree(data);
1589: }
1.77 itojun 1590: static void
1.94 markus 1591: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1592: {
1.42 markus 1593: u_int data_len;
1.15 markus 1594: char *data = packet_get_string(&data_len);
1.93 markus 1595: packet_check_eom();
1.15 markus 1596: buffer_append(&stderr_buffer, data, data_len);
1597: memset(data, 0, data_len);
1598: xfree(data);
1599: }
1.77 itojun 1600: static void
1.94 markus 1601: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1602: {
1603: exit_status = packet_get_int();
1.93 markus 1604: packet_check_eom();
1.15 markus 1605: /* Acknowledge the exit. */
1606: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1607: packet_send();
1608: /*
1609: * Must wait for packet to be sent since we are
1610: * exiting the loop.
1611: */
1612: packet_write_wait();
1613: /* Flag that we want to exit. */
1614: quit_pending = 1;
1615: }
1.115 markus 1616: static void
1617: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1618: {
1619: Channel *c = NULL;
1620: int remote_id, sock;
1621:
1622: /* Read the remote channel number from the message. */
1623: remote_id = packet_get_int();
1624: packet_check_eom();
1625:
1626: /*
1627: * Get a connection to the local authentication agent (this may again
1628: * get forwarded).
1629: */
1630: sock = ssh_get_authentication_socket();
1631:
1632: /*
1633: * If we could not connect the agent, send an error message back to
1634: * the server. This should never happen unless the agent dies,
1635: * because authentication forwarding is only enabled if we have an
1636: * agent.
1637: */
1638: if (sock >= 0) {
1639: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1640: -1, 0, 0, 0, "authentication agent connection", 1);
1641: c->remote_id = remote_id;
1642: c->force_drain = 1;
1643: }
1644: if (c == NULL) {
1645: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1646: packet_put_int(remote_id);
1647: } else {
1648: /* Send a confirmation to the remote host. */
1649: debug("Forwarding authentication connection.");
1650: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1651: packet_put_int(remote_id);
1652: packet_put_int(c->self);
1653: }
1654: packet_send();
1655: }
1.15 markus 1656:
1.77 itojun 1657: static Channel *
1.40 markus 1658: client_request_forwarded_tcpip(const char *request_type, int rchan)
1659: {
1.103 deraadt 1660: Channel *c = NULL;
1.40 markus 1661: char *listen_address, *originator_address;
1662: int listen_port, originator_port;
1.67 markus 1663: int sock;
1.40 markus 1664:
1665: /* Get rest of the packet */
1666: listen_address = packet_get_string(NULL);
1667: listen_port = packet_get_int();
1668: originator_address = packet_get_string(NULL);
1669: originator_port = packet_get_int();
1.93 markus 1670: packet_check_eom();
1.40 markus 1671:
1672: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1673: listen_address, listen_port, originator_address, originator_port);
1674:
1.80 stevesk 1675: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1676: if (sock < 0) {
1677: xfree(originator_address);
1678: xfree(listen_address);
1679: return NULL;
1680: }
1681: c = channel_new("forwarded-tcpip",
1682: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1683: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1684: originator_address, 1);
1.40 markus 1685: xfree(originator_address);
1686: xfree(listen_address);
1687: return c;
1688: }
1689:
1.103 deraadt 1690: static Channel *
1.40 markus 1691: client_request_x11(const char *request_type, int rchan)
1692: {
1693: Channel *c = NULL;
1694: char *originator;
1695: int originator_port;
1.67 markus 1696: int sock;
1.40 markus 1697:
1698: if (!options.forward_x11) {
1699: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1700: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1701: return NULL;
1702: }
1703: originator = packet_get_string(NULL);
1704: if (datafellows & SSH_BUG_X11FWD) {
1705: debug2("buggy server: x11 request w/o originator_port");
1706: originator_port = 0;
1707: } else {
1708: originator_port = packet_get_int();
1709: }
1.93 markus 1710: packet_check_eom();
1.40 markus 1711: /* XXX check permission */
1.47 markus 1712: debug("client_request_x11: request from %s %d", originator,
1713: originator_port);
1.67 markus 1714: xfree(originator);
1.40 markus 1715: sock = x11_connect_display();
1.67 markus 1716: if (sock < 0)
1717: return NULL;
1718: c = channel_new("x11",
1719: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1720: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1721: c->force_drain = 1;
1.40 markus 1722: return c;
1723: }
1724:
1.103 deraadt 1725: static Channel *
1.40 markus 1726: client_request_agent(const char *request_type, int rchan)
1727: {
1728: Channel *c = NULL;
1.67 markus 1729: int sock;
1.40 markus 1730:
1731: if (!options.forward_agent) {
1732: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1733: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1734: return NULL;
1735: }
1736: sock = ssh_get_authentication_socket();
1.67 markus 1737: if (sock < 0)
1738: return NULL;
1739: c = channel_new("authentication agent connection",
1740: SSH_CHANNEL_OPEN, sock, sock, -1,
1741: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1742: "authentication agent connection", 1);
1.82 markus 1743: c->force_drain = 1;
1.40 markus 1744: return c;
1745: }
1746:
1.22 markus 1747: /* XXXX move to generic input handler */
1.77 itojun 1748: static void
1.94 markus 1749: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1750: {
1751: Channel *c = NULL;
1752: char *ctype;
1753: int rchan;
1.102 markus 1754: u_int rmaxpack, rwindow, len;
1.22 markus 1755:
1756: ctype = packet_get_string(&len);
1757: rchan = packet_get_int();
1758: rwindow = packet_get_int();
1759: rmaxpack = packet_get_int();
1760:
1.24 markus 1761: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1762: ctype, rchan, rwindow, rmaxpack);
1763:
1.40 markus 1764: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1765: c = client_request_forwarded_tcpip(ctype, rchan);
1766: } else if (strcmp(ctype, "x11") == 0) {
1767: c = client_request_x11(ctype, rchan);
1768: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1769: c = client_request_agent(ctype, rchan);
1.22 markus 1770: }
1771: /* XXX duplicate : */
1772: if (c != NULL) {
1773: debug("confirm %s", ctype);
1774: c->remote_id = rchan;
1775: c->remote_window = rwindow;
1776: c->remote_maxpacket = rmaxpack;
1.69 markus 1777: if (c->type != SSH_CHANNEL_CONNECTING) {
1778: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1779: packet_put_int(c->remote_id);
1780: packet_put_int(c->self);
1781: packet_put_int(c->local_window);
1782: packet_put_int(c->local_maxpacket);
1783: packet_send();
1784: }
1.22 markus 1785: } else {
1786: debug("failure %s", ctype);
1787: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1788: packet_put_int(rchan);
1789: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1790: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1791: packet_put_cstring("open failed");
1.66 markus 1792: packet_put_cstring("");
1793: }
1.22 markus 1794: packet_send();
1795: }
1796: xfree(ctype);
1797: }
1.77 itojun 1798: static void
1.94 markus 1799: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1800: {
1801: Channel *c = NULL;
1.123 djm 1802: int exitval, id, reply, success = 0;
1.48 markus 1803: char *rtype;
1804:
1805: id = packet_get_int();
1806: rtype = packet_get_string(NULL);
1807: reply = packet_get_char();
1808:
1809: debug("client_input_channel_req: channel %d rtype %s reply %d",
1810: id, rtype, reply);
1811:
1.128 djm 1812: if (id == -1) {
1813: error("client_input_channel_req: request for channel -1");
1814: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1815: error("client_input_channel_req: channel %d: unknown channel", id);
1816: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1817: exitval = packet_get_int();
1818: if (id == session_ident) {
1819: success = 1;
1820: exit_status = exitval;
1821: } else if (c->ctl_fd == -1) {
1822: error("client_input_channel_req: unexpected channel %d",
1823: session_ident);
1824: } else {
1825: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1826: success = 1;
1827: }
1.93 markus 1828: packet_check_eom();
1.48 markus 1829: }
1830: if (reply) {
1831: packet_start(success ?
1832: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1833: packet_put_int(id);
1.48 markus 1834: packet_send();
1835: }
1836: xfree(rtype);
1837: }
1.95 markus 1838: static void
1839: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1840: {
1841: char *rtype;
1842: int want_reply;
1843: int success = 0;
1844:
1845: rtype = packet_get_string(NULL);
1846: want_reply = packet_get_char();
1.117 markus 1847: debug("client_input_global_request: rtype %s want_reply %d",
1848: rtype, want_reply);
1.95 markus 1849: if (want_reply) {
1850: packet_start(success ?
1851: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1852: packet_send();
1853: packet_write_wait();
1854: }
1855: xfree(rtype);
1856: }
1.22 markus 1857:
1.123 djm 1858: void
1.129 deraadt 1859: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1860: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1861: dispatch_fn *subsys_repl)
1862: {
1863: int len;
1.132 djm 1864: Channel *c = NULL;
1.123 djm 1865:
1866: debug2("%s: id %d", __func__, id);
1867:
1.132 djm 1868: if ((c = channel_lookup(id)) == NULL)
1869: fatal("client_session2_setup: channel %d: unknown channel", id);
1870:
1.123 djm 1871: if (want_tty) {
1872: struct winsize ws;
1873: struct termios tio;
1874:
1875: /* Store window size in the packet. */
1876: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1877: memset(&ws, 0, sizeof(ws));
1878:
1879: channel_request_start(id, "pty-req", 0);
1880: packet_put_cstring(term != NULL ? term : "");
1881: packet_put_int(ws.ws_col);
1882: packet_put_int(ws.ws_row);
1883: packet_put_int(ws.ws_xpixel);
1884: packet_put_int(ws.ws_ypixel);
1885: tio = get_saved_tio();
1886: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1887: packet_send();
1888: /* XXX wait for reply */
1.132 djm 1889: c->client_tty = 1;
1.123 djm 1890: }
1891:
1892: /* Transfer any environment variables from client to server */
1.126 djm 1893: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1894: int i, j, matched;
1895: char *name, *val;
1896:
1897: debug("Sending environment.");
1.126 djm 1898: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1899: /* Split */
1.126 djm 1900: name = xstrdup(env[i]);
1.123 djm 1901: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1902: xfree(name);
1.123 djm 1903: continue;
1904: }
1905: *val++ = '\0';
1906:
1907: matched = 0;
1908: for (j = 0; j < options.num_send_env; j++) {
1909: if (match_pattern(name, options.send_env[j])) {
1910: matched = 1;
1911: break;
1912: }
1913: }
1914: if (!matched) {
1915: debug3("Ignored env %s", name);
1.144 stevesk 1916: xfree(name);
1.123 djm 1917: continue;
1918: }
1919:
1920: debug("Sending env %s = %s", name, val);
1921: channel_request_start(id, "env", 0);
1922: packet_put_cstring(name);
1923: packet_put_cstring(val);
1924: packet_send();
1.144 stevesk 1925: xfree(name);
1.123 djm 1926: }
1927: }
1928:
1929: len = buffer_len(cmd);
1930: if (len > 0) {
1931: if (len > 900)
1932: len = 900;
1933: if (want_subsystem) {
1934: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1935: channel_request_start(id, "subsystem", subsys_repl != NULL);
1936: if (subsys_repl != NULL) {
1937: /* register callback for reply */
1938: /* XXX we assume that client_loop has already been called */
1939: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1940: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1941: }
1942: } else {
1943: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1944: channel_request_start(id, "exec", 0);
1945: }
1946: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1947: packet_send();
1948: } else {
1949: channel_request_start(id, "shell", 0);
1950: packet_send();
1951: }
1952: }
1953:
1.77 itojun 1954: static void
1.49 itojun 1955: client_init_dispatch_20(void)
1.16 markus 1956: {
1.55 markus 1957: dispatch_init(&dispatch_protocol_error);
1.100 markus 1958:
1.16 markus 1959: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1960: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1961: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1962: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1963: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1964: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1965: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1966: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1967: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1968: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1969:
1970: /* rekeying */
1971: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1972:
1973: /* global request reply messages */
1974: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1975: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 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: }
1.77 itojun 1996: static void
1.49 itojun 1997: client_init_dispatch_15(void)
1.15 markus 1998: {
1999: client_init_dispatch_13();
2000: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2001: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2002: }
1.79 stevesk 2003: static void
1.49 itojun 2004: client_init_dispatch(void)
1.15 markus 2005: {
1.16 markus 2006: if (compat20)
2007: client_init_dispatch_20();
2008: else if (compat13)
1.15 markus 2009: client_init_dispatch_13();
2010: else
2011: client_init_dispatch_15();
1.113 markus 2012: }
2013:
2014: /* client specific fatal cleanup */
2015: void
1.114 markus 2016: cleanup_exit(int i)
1.113 markus 2017: {
2018: leave_raw_mode();
2019: leave_non_blocking();
1.123 djm 2020: if (options.control_path != NULL && control_fd != -1)
2021: unlink(options.control_path);
1.114 markus 2022: _exit(i);
1.1 deraadt 2023: }
![[BACK]](/icons/back.gif){kind=icon}
Return to clientloop.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh