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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * Created: Sun Sep 10 00:30:37 1995 ylo | |
6 | * Server main loop for handling the interactive session. | |
7 | */ | |
8efc0c15 | 8 | |
9 | #include "includes.h" | |
10 | #include "xmalloc.h" | |
11 | #include "ssh.h" | |
12 | #include "packet.h" | |
13 | #include "buffer.h" | |
14 | #include "servconf.h" | |
15 | #include "pty.h" | |
7368a6c8 | 16 | #include "channels.h" |
17 | ||
18 | #include "compat.h" | |
19 | #include "dispatch.h" | |
8efc0c15 | 20 | |
21 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
22 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
23 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
24 | static int fdin; /* Descriptor for stdin (for writing) */ | |
25 | static int fdout; /* Descriptor for stdout (for reading); | |
26 | May be same number as fdin. */ | |
27 | static int fderr; /* Descriptor for stderr. May be -1. */ | |
28 | static long stdin_bytes = 0; /* Number of bytes written to stdin. */ | |
29 | static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */ | |
30 | static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */ | |
31 | static long fdout_bytes = 0; /* Number of stdout bytes read from program. */ | |
32 | static int stdin_eof = 0; /* EOF message received from client. */ | |
33 | static int fdout_eof = 0; /* EOF encountered reading from fdout. */ | |
34 | static int fderr_eof = 0; /* EOF encountered readung from fderr. */ | |
35 | static int connection_in; /* Connection to client (input). */ | |
36 | static int connection_out; /* Connection to client (output). */ | |
37 | static unsigned int buffer_high;/* "Soft" max buffer size. */ | |
38 | static int max_fd; /* Max file descriptor number for select(). */ | |
39 | ||
aa3378df | 40 | /* |
41 | * This SIGCHLD kludge is used to detect when the child exits. The server | |
42 | * will exit after that, as soon as forwarded connections have terminated. | |
691a8a9f | 43 | * |
44 | * After SIGCHLD child_has_selected is set to 1 after the first pass | |
45 | * through the wait_until_can_do_something() select(). This ensures | |
46 | * that the child's output gets a chance to drain before it is yanked. | |
aa3378df | 47 | */ |
8efc0c15 | 48 | |
5260325f | 49 | static int child_pid; /* Pid of the child. */ |
8efc0c15 | 50 | static volatile int child_terminated; /* The child has terminated. */ |
691a8a9f | 51 | static volatile int child_has_selected; /* Child has had chance to drain. */ |
8efc0c15 | 52 | static volatile int child_wait_status; /* Status from wait(). */ |
53 | ||
7368a6c8 | 54 | void server_init_dispatch(void); |
55 | ||
5260325f | 56 | void |
57 | sigchld_handler(int sig) | |
8efc0c15 | 58 | { |
5260325f | 59 | int save_errno = errno; |
60 | int wait_pid; | |
61 | debug("Received SIGCHLD."); | |
62 | wait_pid = wait((int *) &child_wait_status); | |
63 | if (wait_pid != -1) { | |
64 | if (wait_pid != child_pid) | |
65 | error("Strange, got SIGCHLD and wait returned pid %d but child is %d", | |
66 | wait_pid, child_pid); | |
67 | if (WIFEXITED(child_wait_status) || | |
68 | WIFSIGNALED(child_wait_status)) | |
69 | child_terminated = 1; | |
691a8a9f | 70 | child_has_selected = 0; |
5260325f | 71 | } |
72 | signal(SIGCHLD, sigchld_handler); | |
73 | errno = save_errno; | |
8efc0c15 | 74 | } |
75 | ||
5260325f | 76 | /* |
77 | * Make packets from buffered stderr data, and buffer it for sending | |
78 | * to the client. | |
79 | */ | |
80 | void | |
81 | make_packets_from_stderr_data() | |
8efc0c15 | 82 | { |
5260325f | 83 | int len; |
84 | ||
85 | /* Send buffered stderr data to the client. */ | |
86 | while (buffer_len(&stderr_buffer) > 0 && | |
a408af76 | 87 | packet_not_very_much_data_to_write()) { |
5260325f | 88 | len = buffer_len(&stderr_buffer); |
89 | if (packet_is_interactive()) { | |
90 | if (len > 512) | |
91 | len = 512; | |
92 | } else { | |
93 | /* Keep the packets at reasonable size. */ | |
94 | if (len > packet_get_maxsize()) | |
95 | len = packet_get_maxsize(); | |
96 | } | |
97 | packet_start(SSH_SMSG_STDERR_DATA); | |
98 | packet_put_string(buffer_ptr(&stderr_buffer), len); | |
99 | packet_send(); | |
100 | buffer_consume(&stderr_buffer, len); | |
101 | stderr_bytes += len; | |
8efc0c15 | 102 | } |
8efc0c15 | 103 | } |
104 | ||
5260325f | 105 | /* |
106 | * Make packets from buffered stdout data, and buffer it for sending to the | |
107 | * client. | |
108 | */ | |
109 | void | |
110 | make_packets_from_stdout_data() | |
8efc0c15 | 111 | { |
5260325f | 112 | int len; |
113 | ||
114 | /* Send buffered stdout data to the client. */ | |
115 | while (buffer_len(&stdout_buffer) > 0 && | |
a408af76 | 116 | packet_not_very_much_data_to_write()) { |
5260325f | 117 | len = buffer_len(&stdout_buffer); |
118 | if (packet_is_interactive()) { | |
119 | if (len > 512) | |
120 | len = 512; | |
121 | } else { | |
122 | /* Keep the packets at reasonable size. */ | |
123 | if (len > packet_get_maxsize()) | |
124 | len = packet_get_maxsize(); | |
125 | } | |
126 | packet_start(SSH_SMSG_STDOUT_DATA); | |
127 | packet_put_string(buffer_ptr(&stdout_buffer), len); | |
128 | packet_send(); | |
129 | buffer_consume(&stdout_buffer, len); | |
130 | stdout_bytes += len; | |
8efc0c15 | 131 | } |
8efc0c15 | 132 | } |
133 | ||
5260325f | 134 | /* |
135 | * Sleep in select() until we can do something. This will initialize the | |
136 | * select masks. Upon return, the masks will indicate which descriptors | |
137 | * have data or can accept data. Optionally, a maximum time can be specified | |
138 | * for the duration of the wait (0 = infinite). | |
139 | */ | |
140 | void | |
141 | wait_until_can_do_something(fd_set * readset, fd_set * writeset, | |
142 | unsigned int max_time_milliseconds) | |
8efc0c15 | 143 | { |
5260325f | 144 | struct timeval tv, *tvp; |
145 | int ret; | |
8efc0c15 | 146 | |
5260325f | 147 | /* When select fails we restart from here. */ |
8efc0c15 | 148 | retry_select: |
149 | ||
5260325f | 150 | /* Initialize select() masks. */ |
151 | FD_ZERO(readset); | |
152 | ||
aa3378df | 153 | /* |
154 | * Read packets from the client unless we have too much buffered | |
155 | * stdin or channel data. | |
156 | */ | |
5260325f | 157 | if (buffer_len(&stdin_buffer) < 4096 && |
158 | channel_not_very_much_buffered_data()) | |
159 | FD_SET(connection_in, readset); | |
160 | ||
aa3378df | 161 | /* |
162 | * If there is not too much data already buffered going to the | |
163 | * client, try to get some more data from the program. | |
164 | */ | |
5260325f | 165 | if (packet_not_very_much_data_to_write()) { |
166 | if (!fdout_eof) | |
167 | FD_SET(fdout, readset); | |
168 | if (!fderr_eof) | |
169 | FD_SET(fderr, readset); | |
170 | } | |
171 | FD_ZERO(writeset); | |
172 | ||
173 | /* Set masks for channel descriptors. */ | |
174 | channel_prepare_select(readset, writeset); | |
175 | ||
aa3378df | 176 | /* |
177 | * If we have buffered packet data going to the client, mark that | |
178 | * descriptor. | |
179 | */ | |
5260325f | 180 | if (packet_have_data_to_write()) |
181 | FD_SET(connection_out, writeset); | |
182 | ||
183 | /* If we have buffered data, try to write some of that data to the | |
184 | program. */ | |
185 | if (fdin != -1 && buffer_len(&stdin_buffer) > 0) | |
186 | FD_SET(fdin, writeset); | |
187 | ||
188 | /* Update the maximum descriptor number if appropriate. */ | |
189 | if (channel_max_fd() > max_fd) | |
190 | max_fd = channel_max_fd(); | |
191 | ||
aa3378df | 192 | /* |
193 | * If child has terminated and there is enough buffer space to read | |
194 | * from it, then read as much as is available and exit. | |
195 | */ | |
5260325f | 196 | if (child_terminated && packet_not_very_much_data_to_write()) |
197 | if (max_time_milliseconds == 0) | |
198 | max_time_milliseconds = 100; | |
199 | ||
200 | if (max_time_milliseconds == 0) | |
201 | tvp = NULL; | |
202 | else { | |
203 | tv.tv_sec = max_time_milliseconds / 1000; | |
204 | tv.tv_usec = 1000 * (max_time_milliseconds % 1000); | |
205 | tvp = &tv; | |
206 | } | |
8efc0c15 | 207 | |
5260325f | 208 | /* Wait for something to happen, or the timeout to expire. */ |
209 | ret = select(max_fd + 1, readset, writeset, NULL, tvp); | |
8efc0c15 | 210 | |
5260325f | 211 | if (ret < 0) { |
212 | if (errno != EINTR) | |
213 | error("select: %.100s", strerror(errno)); | |
214 | else | |
215 | goto retry_select; | |
8efc0c15 | 216 | } |
691a8a9f | 217 | |
218 | if (child_terminated) | |
219 | child_has_selected = 1; | |
8efc0c15 | 220 | } |
221 | ||
5260325f | 222 | /* |
223 | * Processes input from the client and the program. Input data is stored | |
224 | * in buffers and processed later. | |
225 | */ | |
226 | void | |
227 | process_input(fd_set * readset) | |
228 | { | |
229 | int len; | |
230 | char buf[16384]; | |
231 | ||
232 | /* Read and buffer any input data from the client. */ | |
233 | if (FD_ISSET(connection_in, readset)) { | |
234 | len = read(connection_in, buf, sizeof(buf)); | |
235 | if (len == 0) { | |
236 | verbose("Connection closed by remote host."); | |
237 | fatal_cleanup(); | |
238 | } | |
aa3378df | 239 | /* |
240 | * There is a kernel bug on Solaris that causes select to | |
241 | * sometimes wake up even though there is no data available. | |
242 | */ | |
5260325f | 243 | if (len < 0 && errno == EAGAIN) |
244 | len = 0; | |
245 | ||
246 | if (len < 0) { | |
247 | verbose("Read error from remote host: %.100s", strerror(errno)); | |
248 | fatal_cleanup(); | |
249 | } | |
250 | /* Buffer any received data. */ | |
251 | packet_process_incoming(buf, len); | |
252 | } | |
253 | /* Read and buffer any available stdout data from the program. */ | |
254 | if (!fdout_eof && FD_ISSET(fdout, readset)) { | |
255 | len = read(fdout, buf, sizeof(buf)); | |
256 | if (len <= 0) | |
257 | fdout_eof = 1; | |
258 | else { | |
259 | buffer_append(&stdout_buffer, buf, len); | |
260 | fdout_bytes += len; | |
261 | } | |
262 | } | |
263 | /* Read and buffer any available stderr data from the program. */ | |
264 | if (!fderr_eof && FD_ISSET(fderr, readset)) { | |
265 | len = read(fderr, buf, sizeof(buf)); | |
266 | if (len <= 0) | |
267 | fderr_eof = 1; | |
268 | else | |
269 | buffer_append(&stderr_buffer, buf, len); | |
270 | } | |
271 | } | |
8efc0c15 | 272 | |
5260325f | 273 | /* |
274 | * Sends data from internal buffers to client program stdin. | |
275 | */ | |
276 | void | |
277 | process_output(fd_set * writeset) | |
8efc0c15 | 278 | { |
5260325f | 279 | int len; |
280 | ||
281 | /* Write buffered data to program stdin. */ | |
282 | if (fdin != -1 && FD_ISSET(fdin, writeset)) { | |
283 | len = write(fdin, buffer_ptr(&stdin_buffer), | |
a408af76 | 284 | buffer_len(&stdin_buffer)); |
5260325f | 285 | if (len <= 0) { |
8efc0c15 | 286 | #ifdef USE_PIPES |
5260325f | 287 | close(fdin); |
8efc0c15 | 288 | #else |
7368a6c8 | 289 | if (fdin != fdout) |
5260325f | 290 | close(fdin); |
291 | else | |
292 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ | |
8efc0c15 | 293 | #endif |
5260325f | 294 | fdin = -1; |
295 | } else { | |
296 | /* Successful write. Consume the data from the buffer. */ | |
297 | buffer_consume(&stdin_buffer, len); | |
298 | /* Update the count of bytes written to the program. */ | |
299 | stdin_bytes += len; | |
300 | } | |
8efc0c15 | 301 | } |
5260325f | 302 | /* Send any buffered packet data to the client. */ |
303 | if (FD_ISSET(connection_out, writeset)) | |
304 | packet_write_poll(); | |
8efc0c15 | 305 | } |
306 | ||
5260325f | 307 | /* |
308 | * Wait until all buffered output has been sent to the client. | |
309 | * This is used when the program terminates. | |
310 | */ | |
311 | void | |
312 | drain_output() | |
8efc0c15 | 313 | { |
5260325f | 314 | /* Send any buffered stdout data to the client. */ |
315 | if (buffer_len(&stdout_buffer) > 0) { | |
316 | packet_start(SSH_SMSG_STDOUT_DATA); | |
317 | packet_put_string(buffer_ptr(&stdout_buffer), | |
318 | buffer_len(&stdout_buffer)); | |
319 | packet_send(); | |
320 | /* Update the count of sent bytes. */ | |
321 | stdout_bytes += buffer_len(&stdout_buffer); | |
322 | } | |
323 | /* Send any buffered stderr data to the client. */ | |
324 | if (buffer_len(&stderr_buffer) > 0) { | |
325 | packet_start(SSH_SMSG_STDERR_DATA); | |
326 | packet_put_string(buffer_ptr(&stderr_buffer), | |
327 | buffer_len(&stderr_buffer)); | |
328 | packet_send(); | |
329 | /* Update the count of sent bytes. */ | |
330 | stderr_bytes += buffer_len(&stderr_buffer); | |
331 | } | |
332 | /* Wait until all buffered data has been written to the client. */ | |
333 | packet_write_wait(); | |
8efc0c15 | 334 | } |
335 | ||
7368a6c8 | 336 | void |
337 | process_buffered_input_packets() | |
338 | { | |
339 | dispatch_run(DISPATCH_NONBLOCK, NULL); | |
340 | } | |
341 | ||
5260325f | 342 | /* |
343 | * Performs the interactive session. This handles data transmission between | |
344 | * the client and the program. Note that the notion of stdin, stdout, and | |
345 | * stderr in this function is sort of reversed: this function writes to | |
346 | * stdin (of the child program), and reads from stdout and stderr (of the | |
347 | * child program). | |
348 | */ | |
349 | void | |
350 | server_loop(int pid, int fdin_arg, int fdout_arg, int fderr_arg) | |
8efc0c15 | 351 | { |
5260325f | 352 | int wait_status, wait_pid; /* Status and pid returned by wait(). */ |
353 | int waiting_termination = 0; /* Have displayed waiting close message. */ | |
354 | unsigned int max_time_milliseconds; | |
355 | unsigned int previous_stdout_buffer_bytes; | |
356 | unsigned int stdout_buffer_bytes; | |
357 | int type; | |
358 | ||
359 | debug("Entering interactive session."); | |
360 | ||
361 | /* Initialize the SIGCHLD kludge. */ | |
362 | child_pid = pid; | |
363 | child_terminated = 0; | |
691a8a9f | 364 | child_has_selected = 0; |
5260325f | 365 | signal(SIGCHLD, sigchld_handler); |
366 | ||
367 | /* Initialize our global variables. */ | |
368 | fdin = fdin_arg; | |
369 | fdout = fdout_arg; | |
370 | fderr = fderr_arg; | |
371 | connection_in = packet_get_connection_in(); | |
372 | connection_out = packet_get_connection_out(); | |
373 | ||
374 | previous_stdout_buffer_bytes = 0; | |
375 | ||
376 | /* Set approximate I/O buffer size. */ | |
377 | if (packet_is_interactive()) | |
378 | buffer_high = 4096; | |
379 | else | |
380 | buffer_high = 64 * 1024; | |
381 | ||
382 | /* Initialize max_fd to the maximum of the known file descriptors. */ | |
383 | max_fd = fdin; | |
384 | if (fdout > max_fd) | |
385 | max_fd = fdout; | |
386 | if (fderr != -1 && fderr > max_fd) | |
387 | max_fd = fderr; | |
388 | if (connection_in > max_fd) | |
389 | max_fd = connection_in; | |
390 | if (connection_out > max_fd) | |
391 | max_fd = connection_out; | |
392 | ||
393 | /* Initialize Initialize buffers. */ | |
394 | buffer_init(&stdin_buffer); | |
395 | buffer_init(&stdout_buffer); | |
396 | buffer_init(&stderr_buffer); | |
397 | ||
aa3378df | 398 | /* |
399 | * If we have no separate fderr (which is the case when we have a pty | |
400 | * - there we cannot make difference between data sent to stdout and | |
401 | * stderr), indicate that we have seen an EOF from stderr. This way | |
402 | * we don\'t need to check the descriptor everywhere. | |
403 | */ | |
5260325f | 404 | if (fderr == -1) |
405 | fderr_eof = 1; | |
406 | ||
7368a6c8 | 407 | server_init_dispatch(); |
408 | ||
5260325f | 409 | /* Main loop of the server for the interactive session mode. */ |
410 | for (;;) { | |
411 | fd_set readset, writeset; | |
412 | ||
413 | /* Process buffered packets from the client. */ | |
414 | process_buffered_input_packets(); | |
415 | ||
aa3378df | 416 | /* |
417 | * If we have received eof, and there is no more pending | |
418 | * input data, cause a real eof by closing fdin. | |
419 | */ | |
5260325f | 420 | if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 421 | #ifdef USE_PIPES |
5260325f | 422 | close(fdin); |
8efc0c15 | 423 | #else |
7368a6c8 | 424 | if (fdin != fdout) |
5260325f | 425 | close(fdin); |
426 | else | |
427 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ | |
8efc0c15 | 428 | #endif |
5260325f | 429 | fdin = -1; |
430 | } | |
aa3378df | 431 | /* Make packets from buffered stderr data to send to the client. */ |
5260325f | 432 | make_packets_from_stderr_data(); |
433 | ||
aa3378df | 434 | /* |
435 | * Make packets from buffered stdout data to send to the | |
436 | * client. If there is very little to send, this arranges to | |
437 | * not send them now, but to wait a short while to see if we | |
438 | * are getting more data. This is necessary, as some systems | |
439 | * wake up readers from a pty after each separate character. | |
440 | */ | |
5260325f | 441 | max_time_milliseconds = 0; |
442 | stdout_buffer_bytes = buffer_len(&stdout_buffer); | |
443 | if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && | |
444 | stdout_buffer_bytes != previous_stdout_buffer_bytes) { | |
445 | /* try again after a while */ | |
446 | max_time_milliseconds = 10; | |
447 | } else { | |
448 | /* Send it now. */ | |
449 | make_packets_from_stdout_data(); | |
450 | } | |
451 | previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); | |
452 | ||
453 | /* Send channel data to the client. */ | |
454 | if (packet_not_very_much_data_to_write()) | |
455 | channel_output_poll(); | |
456 | ||
aa3378df | 457 | /* |
458 | * Bail out of the loop if the program has closed its output | |
459 | * descriptors, and we have no more data to send to the | |
460 | * client, and there is no pending buffered data. | |
461 | */ | |
691a8a9f | 462 | if (((fdout_eof && fderr_eof) || |
463 | (child_terminated && child_has_selected)) && | |
464 | !packet_have_data_to_write() && | |
465 | (buffer_len(&stdout_buffer) == 0) && | |
466 | (buffer_len(&stderr_buffer) == 0)) { | |
5260325f | 467 | if (!channel_still_open()) |
7368a6c8 | 468 | break; |
5260325f | 469 | if (!waiting_termination) { |
470 | const char *s = "Waiting for forwarded connections to terminate...\r\n"; | |
471 | char *cp; | |
472 | waiting_termination = 1; | |
473 | buffer_append(&stderr_buffer, s, strlen(s)); | |
474 | ||
475 | /* Display list of open channels. */ | |
476 | cp = channel_open_message(); | |
477 | buffer_append(&stderr_buffer, cp, strlen(cp)); | |
478 | xfree(cp); | |
479 | } | |
480 | } | |
481 | /* Sleep in select() until we can do something. */ | |
482 | wait_until_can_do_something(&readset, &writeset, | |
483 | max_time_milliseconds); | |
484 | ||
485 | /* Process any channel events. */ | |
486 | channel_after_select(&readset, &writeset); | |
487 | ||
488 | /* Process input from the client and from program stdout/stderr. */ | |
489 | process_input(&readset); | |
490 | ||
491 | /* Process output to the client and to program stdin. */ | |
492 | process_output(&writeset); | |
8efc0c15 | 493 | } |
494 | ||
5260325f | 495 | /* Cleanup and termination code. */ |
8efc0c15 | 496 | |
5260325f | 497 | /* Wait until all output has been sent to the client. */ |
498 | drain_output(); | |
8efc0c15 | 499 | |
5260325f | 500 | debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.", |
501 | stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); | |
8efc0c15 | 502 | |
5260325f | 503 | /* Free and clear the buffers. */ |
504 | buffer_free(&stdin_buffer); | |
505 | buffer_free(&stdout_buffer); | |
506 | buffer_free(&stderr_buffer); | |
8efc0c15 | 507 | |
5260325f | 508 | /* Close the file descriptors. */ |
509 | if (fdout != -1) | |
510 | close(fdout); | |
511 | fdout = -1; | |
512 | fdout_eof = 1; | |
513 | if (fderr != -1) | |
514 | close(fderr); | |
515 | fderr = -1; | |
516 | fderr_eof = 1; | |
517 | if (fdin != -1) | |
518 | close(fdin); | |
519 | fdin = -1; | |
520 | ||
521 | /* Stop listening for channels; this removes unix domain sockets. */ | |
522 | channel_stop_listening(); | |
523 | ||
524 | /* Wait for the child to exit. Get its exit status. */ | |
525 | wait_pid = wait(&wait_status); | |
526 | if (wait_pid < 0) { | |
527 | /* | |
528 | * It is possible that the wait was handled by SIGCHLD | |
529 | * handler. This may result in either: this call | |
530 | * returning with EINTR, or: this call returning ECHILD. | |
531 | */ | |
532 | if (child_terminated) | |
533 | wait_status = child_wait_status; | |
534 | else | |
535 | packet_disconnect("wait: %.100s", strerror(errno)); | |
536 | } else { | |
537 | /* Check if it matches the process we forked. */ | |
538 | if (wait_pid != pid) | |
539 | error("Strange, wait returned pid %d, expected %d", | |
57112b5a | 540 | wait_pid, pid); |
5260325f | 541 | } |
8efc0c15 | 542 | |
5260325f | 543 | /* We no longer want our SIGCHLD handler to be called. */ |
544 | signal(SIGCHLD, SIG_DFL); | |
545 | ||
546 | /* Check if it exited normally. */ | |
547 | if (WIFEXITED(wait_status)) { | |
548 | /* Yes, normal exit. Get exit status and send it to the client. */ | |
549 | debug("Command exited with status %d.", WEXITSTATUS(wait_status)); | |
550 | packet_start(SSH_SMSG_EXITSTATUS); | |
551 | packet_put_int(WEXITSTATUS(wait_status)); | |
552 | packet_send(); | |
553 | packet_write_wait(); | |
554 | ||
aa3378df | 555 | /* |
556 | * Wait for exit confirmation. Note that there might be | |
557 | * other packets coming before it; however, the program has | |
558 | * already died so we just ignore them. The client is | |
559 | * supposed to respond with the confirmation when it receives | |
560 | * the exit status. | |
561 | */ | |
5260325f | 562 | do { |
563 | int plen; | |
564 | type = packet_read(&plen); | |
565 | } | |
566 | while (type != SSH_CMSG_EXIT_CONFIRMATION); | |
567 | ||
568 | debug("Received exit confirmation."); | |
569 | return; | |
570 | } | |
571 | /* Check if the program terminated due to a signal. */ | |
572 | if (WIFSIGNALED(wait_status)) | |
573 | packet_disconnect("Command terminated on signal %d.", | |
574 | WTERMSIG(wait_status)); | |
575 | ||
576 | /* Some weird exit cause. Just exit. */ | |
577 | packet_disconnect("wait returned status %04x.", wait_status); | |
578 | /* NOTREACHED */ | |
579 | } | |
7368a6c8 | 580 | |
581 | void | |
582 | server_input_stdin_data(int type, int plen) | |
583 | { | |
584 | char *data; | |
585 | unsigned int data_len; | |
586 | ||
587 | /* Stdin data from the client. Append it to the buffer. */ | |
588 | /* Ignore any data if the client has closed stdin. */ | |
589 | if (fdin == -1) | |
590 | return; | |
591 | data = packet_get_string(&data_len); | |
592 | packet_integrity_check(plen, (4 + data_len), type); | |
593 | buffer_append(&stdin_buffer, data, data_len); | |
594 | memset(data, 0, data_len); | |
595 | xfree(data); | |
596 | } | |
597 | ||
598 | void | |
599 | server_input_eof(int type, int plen) | |
600 | { | |
601 | /* | |
602 | * Eof from the client. The stdin descriptor to the | |
603 | * program will be closed when all buffered data has | |
604 | * drained. | |
605 | */ | |
606 | debug("EOF received for stdin."); | |
607 | packet_integrity_check(plen, 0, type); | |
608 | stdin_eof = 1; | |
609 | } | |
610 | ||
611 | void | |
612 | server_input_window_size(int type, int plen) | |
613 | { | |
614 | int row = packet_get_int(); | |
615 | int col = packet_get_int(); | |
616 | int xpixel = packet_get_int(); | |
617 | int ypixel = packet_get_int(); | |
618 | ||
619 | debug("Window change received."); | |
620 | packet_integrity_check(plen, 4 * 4, type); | |
621 | if (fdin != -1) | |
622 | pty_change_window_size(fdin, row, col, xpixel, ypixel); | |
623 | } | |
624 | ||
625 | void | |
626 | server_init_dispatch_13() | |
627 | { | |
628 | debug("server_init_dispatch_13"); | |
629 | dispatch_init(NULL); | |
630 | dispatch_set(SSH_CMSG_EOF, &server_input_eof); | |
631 | dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); | |
632 | dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); | |
633 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
634 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
635 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
636 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
637 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
638 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
639 | } | |
640 | void | |
641 | server_init_dispatch_15() | |
642 | { | |
643 | server_init_dispatch_13(); | |
644 | debug("server_init_dispatch_15"); | |
645 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
646 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); | |
647 | } | |
648 | void | |
649 | server_init_dispatch() | |
650 | { | |
651 | if (compat13) | |
652 | server_init_dispatch_13(); | |
653 | else | |
654 | server_init_dispatch_15(); | |
655 | } |