28d00fe4 |
1 | /* |
2 | * Pseudo-tty backend for pterm. |
3 | * |
4 | * Unlike the other backends, data for this one is not neatly |
5 | * encapsulated into a data structure, because it wouldn't make |
6 | * sense to do so - the utmp stuff has to be done before a backend |
7 | * is initialised, and starting a second pterm from the same |
8 | * process would therefore be infeasible because privileges would |
9 | * already have been dropped. Hence, I haven't bothered to keep the |
10 | * data dynamically allocated: instead, the backend handle is just |
11 | * a null pointer and ignored everywhere. |
12 | */ |
13 | |
054d8535 |
14 | #define _XOPEN_SOURCE |
88e6b9ca |
15 | #define _XOPEN_SOURCE_EXTENDED |
054d8535 |
16 | #include <features.h> |
17 | |
1709795f |
18 | #include <stdio.h> |
19 | #include <stdlib.h> |
054d8535 |
20 | #include <string.h> |
21 | #include <unistd.h> |
a0e16eb1 |
22 | #include <signal.h> |
054d8535 |
23 | #include <fcntl.h> |
88e6b9ca |
24 | #include <termios.h> |
be4f86de |
25 | #include <grp.h> |
755a6d84 |
26 | #include <utmp.h> |
27 | #include <pwd.h> |
28 | #include <time.h> |
a0e16eb1 |
29 | #include <sys/types.h> |
30 | #include <sys/wait.h> |
88e6b9ca |
31 | #include <sys/ioctl.h> |
0f33f9d1 |
32 | #include <errno.h> |
1709795f |
33 | |
34 | #include "putty.h" |
35 | |
36 | #ifndef FALSE |
37 | #define FALSE 0 |
38 | #endif |
39 | #ifndef TRUE |
40 | #define TRUE 1 |
41 | #endif |
42 | |
755a6d84 |
43 | #ifndef UTMP_FILE |
44 | #define UTMP_FILE "/var/run/utmp" |
45 | #endif |
46 | #ifndef WTMP_FILE |
47 | #define WTMP_FILE "/var/log/wtmp" |
48 | #endif |
49 | #ifndef LASTLOG_FILE |
50 | #ifdef _PATH_LASTLOG |
51 | #define LASTLOG_FILE _PATH_LASTLOG |
52 | #else |
53 | #define LASTLOG_FILE "/var/log/lastlog" |
54 | #endif |
55 | #endif |
56 | |
f51dc031 |
57 | /* |
58 | * Set up a default for vaguely sane systems. The idea is that if |
59 | * OMIT_UTMP is not defined, then at least one of the symbols which |
60 | * enable particular forms of utmp processing should be, if only so |
61 | * that a link error can warn you that you should have defined |
62 | * OMIT_UTMP if you didn't want any. Currently HAVE_PUTUTLINE is |
63 | * the only such symbol. |
64 | */ |
65 | #ifndef OMIT_UTMP |
66 | #if !defined HAVE_PUTUTLINE |
67 | #define HAVE_PUTUTLINE |
68 | #endif |
69 | #endif |
70 | |
054d8535 |
71 | int pty_master_fd; |
a8327734 |
72 | static void *pty_frontend; |
95c47834 |
73 | static char pty_name[FILENAME_MAX]; |
f51dc031 |
74 | static int pty_stamped_utmp = 0; |
a0e16eb1 |
75 | static int pty_child_pid; |
95c47834 |
76 | static int pty_utmp_helper_pid, pty_utmp_helper_pipe; |
f278d6f8 |
77 | static int pty_term_width, pty_term_height; |
0f33f9d1 |
78 | static volatile sig_atomic_t pty_child_dead; |
79 | static volatile int pty_exit_code; |
755a6d84 |
80 | #ifndef OMIT_UTMP |
81 | static struct utmp utmp_entry; |
82 | #endif |
6169c758 |
83 | char **pty_argv; |
054d8535 |
84 | |
95c47834 |
85 | static void setup_utmp(char *ttyname, char *location) |
755a6d84 |
86 | { |
87 | #ifndef OMIT_UTMP |
88 | #ifdef HAVE_LASTLOG |
89 | struct lastlog lastlog_entry; |
90 | FILE *lastlog; |
91 | #endif |
92 | struct passwd *pw; |
755a6d84 |
93 | FILE *wtmp; |
94 | |
95 | pw = getpwuid(getuid()); |
96 | memset(&utmp_entry, 0, sizeof(utmp_entry)); |
97 | utmp_entry.ut_type = USER_PROCESS; |
98 | utmp_entry.ut_pid = getpid(); |
99 | strncpy(utmp_entry.ut_line, ttyname+5, lenof(utmp_entry.ut_line)); |
100 | strncpy(utmp_entry.ut_id, ttyname+8, lenof(utmp_entry.ut_id)); |
101 | strncpy(utmp_entry.ut_user, pw->pw_name, lenof(utmp_entry.ut_user)); |
102 | strncpy(utmp_entry.ut_host, location, lenof(utmp_entry.ut_host)); |
103 | time(&utmp_entry.ut_time); |
104 | |
105 | #if defined HAVE_PUTUTLINE |
106 | utmpname(UTMP_FILE); |
107 | setutent(); |
108 | pututline(&utmp_entry); |
109 | endutent(); |
110 | #endif |
111 | |
112 | if ((wtmp = fopen(WTMP_FILE, "a")) != NULL) { |
113 | fwrite(&utmp_entry, 1, sizeof(utmp_entry), wtmp); |
114 | fclose(wtmp); |
115 | } |
116 | |
117 | #ifdef HAVE_LASTLOG |
118 | memset(&lastlog_entry, 0, sizeof(lastlog_entry)); |
119 | strncpy(lastlog_entry.ll_line, ttyname+5, lenof(lastlog_entry.ll_line)); |
120 | strncpy(lastlog_entry.ll_host, location, lenof(lastlog_entry.ll_host)); |
121 | time(&lastlog_entry.ll_time); |
122 | if ((lastlog = fopen(LASTLOG_FILE, "r+")) != NULL) { |
123 | fseek(lastlog, sizeof(lastlog_entry) * getuid(), SEEK_SET); |
124 | fwrite(&lastlog_entry, 1, sizeof(lastlog_entry), lastlog); |
125 | fclose(lastlog); |
126 | } |
127 | #endif |
128 | |
f51dc031 |
129 | pty_stamped_utmp = 1; |
130 | |
755a6d84 |
131 | #endif |
132 | } |
133 | |
134 | static void cleanup_utmp(void) |
135 | { |
136 | #ifndef OMIT_UTMP |
137 | FILE *wtmp; |
138 | |
95c47834 |
139 | if (!pty_stamped_utmp) |
f51dc031 |
140 | return; |
141 | |
755a6d84 |
142 | utmp_entry.ut_type = DEAD_PROCESS; |
143 | memset(utmp_entry.ut_user, 0, lenof(utmp_entry.ut_user)); |
144 | time(&utmp_entry.ut_time); |
145 | |
146 | if ((wtmp = fopen(WTMP_FILE, "a")) != NULL) { |
147 | fwrite(&utmp_entry, 1, sizeof(utmp_entry), wtmp); |
148 | fclose(wtmp); |
149 | } |
150 | |
151 | memset(utmp_entry.ut_line, 0, lenof(utmp_entry.ut_line)); |
152 | utmp_entry.ut_time = 0; |
153 | |
154 | #if defined HAVE_PUTUTLINE |
155 | utmpname(UTMP_FILE); |
156 | setutent(); |
157 | pututline(&utmp_entry); |
158 | endutent(); |
159 | #endif |
160 | |
f51dc031 |
161 | pty_stamped_utmp = 0; /* ensure we never double-cleanup */ |
755a6d84 |
162 | #endif |
163 | } |
164 | |
a0e16eb1 |
165 | static void sigchld_handler(int signum) |
166 | { |
0f33f9d1 |
167 | int save_errno = errno; |
a0e16eb1 |
168 | pid_t pid; |
169 | int status; |
0f33f9d1 |
170 | |
a0e16eb1 |
171 | pid = waitpid(-1, &status, WNOHANG); |
90cfd8f4 |
172 | if (pid == pty_child_pid && (WIFEXITED(status) || WIFSIGNALED(status))) { |
173 | pty_exit_code = status; |
174 | pty_child_dead = TRUE; |
175 | } |
0f33f9d1 |
176 | errno = save_errno; |
a0e16eb1 |
177 | } |
178 | |
755a6d84 |
179 | static void fatal_sig_handler(int signum) |
180 | { |
0f33f9d1 |
181 | putty_signal(signum, SIG_DFL); |
755a6d84 |
182 | cleanup_utmp(); |
183 | setuid(getuid()); |
184 | raise(signum); |
185 | } |
186 | |
95c47834 |
187 | static void pty_open_master(void) |
1709795f |
188 | { |
be4f86de |
189 | #ifdef BSD_PTYS |
95c47834 |
190 | const char chars1[] = "pqrstuvwxyz"; |
191 | const char chars2[] = "0123456789abcdef"; |
192 | const char *p1, *p2; |
193 | char master_name[20]; |
194 | struct group *gp; |
195 | |
196 | for (p1 = chars1; *p1; p1++) |
197 | for (p2 = chars2; *p2; p2++) { |
198 | sprintf(master_name, "/dev/pty%c%c", *p1, *p2); |
199 | pty_master_fd = open(master_name, O_RDWR); |
200 | if (pty_master_fd >= 0) { |
201 | if (geteuid() == 0 || |
202 | access(master_name, R_OK | W_OK) == 0) |
203 | goto got_one; |
204 | close(pty_master_fd); |
be4f86de |
205 | } |
95c47834 |
206 | } |
be4f86de |
207 | |
95c47834 |
208 | /* If we get here, we couldn't get a tty at all. */ |
209 | fprintf(stderr, "pterm: unable to open a pseudo-terminal device\n"); |
210 | exit(1); |
be4f86de |
211 | |
95c47834 |
212 | got_one: |
213 | strcpy(pty_name, master_name); |
214 | pty_name[5] = 't'; /* /dev/ptyXX -> /dev/ttyXX */ |
215 | |
216 | /* We need to chown/chmod the /dev/ttyXX device. */ |
217 | gp = getgrnam("tty"); |
218 | chown(pty_name, getuid(), gp ? gp->gr_gid : -1); |
219 | chmod(pty_name, 0600); |
be4f86de |
220 | #else |
054d8535 |
221 | pty_master_fd = open("/dev/ptmx", O_RDWR); |
222 | |
223 | if (pty_master_fd < 0) { |
224 | perror("/dev/ptmx: open"); |
225 | exit(1); |
226 | } |
227 | |
228 | if (grantpt(pty_master_fd) < 0) { |
229 | perror("grantpt"); |
230 | exit(1); |
231 | } |
232 | |
233 | if (unlockpt(pty_master_fd) < 0) { |
234 | perror("unlockpt"); |
235 | exit(1); |
236 | } |
237 | |
95c47834 |
238 | pty_name[FILENAME_MAX-1] = '\0'; |
239 | strncpy(pty_name, ptsname(pty_master_fd), FILENAME_MAX-1); |
be4f86de |
240 | #endif |
95c47834 |
241 | } |
054d8535 |
242 | |
95c47834 |
243 | /* |
244 | * Pre-initialisation. This is here to get around the fact that GTK |
245 | * doesn't like being run in setuid/setgid programs (probably |
246 | * sensibly). So before we initialise GTK - and therefore before we |
247 | * even process the command line - we check to see if we're running |
248 | * set[ug]id. If so, we open our pty master _now_, chown it as |
249 | * necessary, and drop privileges. We can always close it again |
250 | * later. If we're potentially going to be doing utmp as well, we |
251 | * also fork off a utmp helper process and communicate with it by |
252 | * means of a pipe; the utmp helper will keep privileges in order |
253 | * to clean up utmp when we exit (i.e. when its end of our pipe |
254 | * closes). |
255 | */ |
256 | void pty_pre_init(void) |
257 | { |
258 | pid_t pid; |
259 | int pipefd[2]; |
260 | |
0f33f9d1 |
261 | /* set the child signal handler straight away; it needs to be set |
262 | * before we ever fork. */ |
263 | putty_signal(SIGCHLD, sigchld_handler); |
95c47834 |
264 | pty_master_fd = -1; |
265 | |
266 | if (geteuid() != getuid() || getegid() != getgid()) { |
267 | pty_open_master(); |
39baeaa4 |
268 | } |
269 | |
95c47834 |
270 | #ifndef OMIT_UTMP |
39baeaa4 |
271 | /* |
95c47834 |
272 | * Fork off the utmp helper. |
755a6d84 |
273 | */ |
95c47834 |
274 | if (pipe(pipefd) < 0) { |
275 | perror("pterm: pipe"); |
276 | exit(1); |
277 | } |
278 | pid = fork(); |
279 | if (pid < 0) { |
280 | perror("pterm: fork"); |
281 | exit(1); |
282 | } else if (pid == 0) { |
283 | char display[128], buffer[128]; |
284 | int dlen, ret; |
285 | |
286 | close(pipefd[1]); |
287 | /* |
288 | * Now sit here until we receive a display name from the |
289 | * other end of the pipe, and then stamp utmp. Unstamp utmp |
290 | * again, and exit, when the pipe closes. |
291 | */ |
292 | |
293 | dlen = 0; |
294 | while (1) { |
295 | |
296 | ret = read(pipefd[0], buffer, lenof(buffer)); |
297 | if (ret <= 0) { |
298 | cleanup_utmp(); |
0f33f9d1 |
299 | _exit(0); |
95c47834 |
300 | } else if (!pty_stamped_utmp) { |
301 | if (dlen < lenof(display)) |
302 | memcpy(display+dlen, buffer, |
303 | min(ret, lenof(display)-dlen)); |
304 | if (buffer[ret-1] == '\0') { |
305 | /* |
306 | * Now we have a display name. NUL-terminate |
307 | * it, and stamp utmp. |
308 | */ |
309 | display[lenof(display)-1] = '\0'; |
310 | /* |
311 | * Trap as many fatal signals as we can in the |
312 | * hope of having the best possible chance to |
313 | * clean up utmp before termination. We are |
314 | * unfortunately unprotected against SIGKILL, |
315 | * but that's life. |
316 | */ |
0f33f9d1 |
317 | putty_signal(SIGHUP, fatal_sig_handler); |
318 | putty_signal(SIGINT, fatal_sig_handler); |
319 | putty_signal(SIGQUIT, fatal_sig_handler); |
320 | putty_signal(SIGILL, fatal_sig_handler); |
321 | putty_signal(SIGABRT, fatal_sig_handler); |
322 | putty_signal(SIGFPE, fatal_sig_handler); |
323 | putty_signal(SIGPIPE, fatal_sig_handler); |
324 | putty_signal(SIGALRM, fatal_sig_handler); |
325 | putty_signal(SIGTERM, fatal_sig_handler); |
326 | putty_signal(SIGSEGV, fatal_sig_handler); |
327 | putty_signal(SIGUSR1, fatal_sig_handler); |
328 | putty_signal(SIGUSR2, fatal_sig_handler); |
755a6d84 |
329 | #ifdef SIGBUS |
0f33f9d1 |
330 | putty_signal(SIGBUS, fatal_sig_handler); |
755a6d84 |
331 | #endif |
332 | #ifdef SIGPOLL |
0f33f9d1 |
333 | putty_signal(SIGPOLL, fatal_sig_handler); |
755a6d84 |
334 | #endif |
335 | #ifdef SIGPROF |
0f33f9d1 |
336 | putty_signal(SIGPROF, fatal_sig_handler); |
755a6d84 |
337 | #endif |
338 | #ifdef SIGSYS |
0f33f9d1 |
339 | putty_signal(SIGSYS, fatal_sig_handler); |
755a6d84 |
340 | #endif |
341 | #ifdef SIGTRAP |
0f33f9d1 |
342 | putty_signal(SIGTRAP, fatal_sig_handler); |
755a6d84 |
343 | #endif |
344 | #ifdef SIGVTALRM |
0f33f9d1 |
345 | putty_signal(SIGVTALRM, fatal_sig_handler); |
755a6d84 |
346 | #endif |
347 | #ifdef SIGXCPU |
0f33f9d1 |
348 | putty_signal(SIGXCPU, fatal_sig_handler); |
755a6d84 |
349 | #endif |
350 | #ifdef SIGXFSZ |
0f33f9d1 |
351 | putty_signal(SIGXFSZ, fatal_sig_handler); |
755a6d84 |
352 | #endif |
353 | #ifdef SIGIO |
0f33f9d1 |
354 | putty_signal(SIGIO, fatal_sig_handler); |
95c47834 |
355 | #endif |
95c47834 |
356 | setup_utmp(pty_name, display); |
357 | } |
358 | } |
359 | } |
360 | } else { |
361 | close(pipefd[0]); |
362 | pty_utmp_helper_pid = pid; |
363 | pty_utmp_helper_pipe = pipefd[1]; |
364 | } |
755a6d84 |
365 | #endif |
95c47834 |
366 | |
367 | /* Drop privs. */ |
368 | { |
369 | int gid = getgid(), uid = getuid(); |
370 | #ifndef HAVE_NO_SETRESUID |
371 | int setresgid(gid_t, gid_t, gid_t); |
372 | int setresuid(uid_t, uid_t, uid_t); |
373 | setresgid(gid, gid, gid); |
374 | setresuid(uid, uid, uid); |
375 | #else |
376 | setgid(getgid()); |
377 | setuid(getuid()); |
378 | #endif |
379 | } |
380 | } |
381 | |
382 | /* |
383 | * Called to set up the pty. |
384 | * |
385 | * Returns an error message, or NULL on success. |
386 | * |
387 | * Also places the canonical host name into `realhost'. It must be |
388 | * freed by the caller. |
389 | */ |
28d00fe4 |
390 | static char *pty_init(void *frontend, void **backend_handle, |
887035a5 |
391 | char *host, int port, char **realhost, int nodelay) |
95c47834 |
392 | { |
393 | int slavefd; |
394 | pid_t pid, pgrp; |
395 | |
a8327734 |
396 | pty_frontend = frontend; |
28d00fe4 |
397 | *backend_handle = NULL; /* we can't sensibly use this, sadly */ |
398 | |
f278d6f8 |
399 | pty_term_width = cfg.width; |
400 | pty_term_height = cfg.height; |
401 | |
95c47834 |
402 | if (pty_master_fd < 0) |
403 | pty_open_master(); |
404 | |
405 | /* |
406 | * Set the backspace character to be whichever of ^H and ^? is |
407 | * specified by bksp_is_delete. |
408 | */ |
409 | { |
410 | struct termios attrs; |
411 | tcgetattr(pty_master_fd, &attrs); |
412 | attrs.c_cc[VERASE] = cfg.bksp_is_delete ? '\177' : '\010'; |
413 | tcsetattr(pty_master_fd, TCSANOW, &attrs); |
414 | } |
415 | |
416 | /* |
417 | * Stamp utmp (that is, tell the utmp helper process to do so), |
418 | * or not. |
419 | */ |
420 | if (!cfg.stamp_utmp) |
421 | close(pty_utmp_helper_pipe); /* just let the child process die */ |
422 | else { |
a8327734 |
423 | char *location = get_x_display(pty_frontend); |
95c47834 |
424 | int len = strlen(location)+1, pos = 0; /* +1 to include NUL */ |
425 | while (pos < len) { |
426 | int ret = write(pty_utmp_helper_pipe, location+pos, len - pos); |
427 | if (ret < 0) { |
428 | perror("pterm: writing to utmp helper process"); |
429 | close(pty_utmp_helper_pipe); /* arrgh, just give up */ |
430 | break; |
431 | } |
432 | pos += ret; |
433 | } |
434 | } |
755a6d84 |
435 | |
436 | /* |
054d8535 |
437 | * Fork and execute the command. |
438 | */ |
439 | pid = fork(); |
440 | if (pid < 0) { |
441 | perror("fork"); |
88e6b9ca |
442 | exit(1); |
054d8535 |
443 | } |
444 | |
445 | if (pid == 0) { |
446 | int i; |
447 | /* |
448 | * We are the child. |
449 | */ |
d37c2d81 |
450 | |
95c47834 |
451 | slavefd = open(pty_name, O_RDWR); |
d37c2d81 |
452 | if (slavefd < 0) { |
453 | perror("slave pty: open"); |
0f33f9d1 |
454 | _exit(1); |
d37c2d81 |
455 | } |
456 | |
054d8535 |
457 | close(pty_master_fd); |
054d8535 |
458 | fcntl(slavefd, F_SETFD, 0); /* don't close on exec */ |
459 | dup2(slavefd, 0); |
460 | dup2(slavefd, 1); |
461 | dup2(slavefd, 2); |
462 | setsid(); |
d37c2d81 |
463 | ioctl(slavefd, TIOCSCTTY, 1); |
464 | pgrp = getpid(); |
465 | tcsetpgrp(slavefd, pgrp); |
466 | setpgrp(); |
95c47834 |
467 | close(open(pty_name, O_WRONLY, 0)); |
054d8535 |
468 | setpgrp(); |
054d8535 |
469 | /* Close everything _else_, for tidiness. */ |
470 | for (i = 3; i < 1024; i++) |
471 | close(i); |
fe9548aa |
472 | { |
473 | char term_env_var[10 + sizeof(cfg.termtype)]; |
474 | sprintf(term_env_var, "TERM=%s", cfg.termtype); |
475 | putenv(term_env_var); |
476 | } |
8bf5c419 |
477 | /* |
478 | * SIGINT and SIGQUIT may have been set to ignored by our |
479 | * parent, particularly by things like sh -c 'pterm &' and |
480 | * some window managers. Reverse this for our child process. |
481 | */ |
0f33f9d1 |
482 | putty_signal(SIGINT, SIG_DFL); |
483 | putty_signal(SIGQUIT, SIG_DFL); |
6169c758 |
484 | if (pty_argv) |
485 | execvp(pty_argv[0], pty_argv); |
c8ee61b9 |
486 | else { |
487 | char *shell = getenv("SHELL"); |
488 | char *shellname; |
489 | if (cfg.login_shell) { |
490 | char *p = strrchr(shell, '/'); |
491 | shellname = smalloc(2+strlen(shell)); |
492 | p = p ? p+1 : shell; |
493 | sprintf(shellname, "-%s", p); |
494 | } else |
495 | shellname = shell; |
496 | execl(getenv("SHELL"), shellname, NULL); |
497 | } |
498 | |
054d8535 |
499 | /* |
500 | * If we're here, exec has gone badly foom. |
501 | */ |
502 | perror("exec"); |
0f33f9d1 |
503 | _exit(127); |
054d8535 |
504 | } else { |
a0e16eb1 |
505 | pty_child_pid = pid; |
506 | pty_child_dead = FALSE; |
0f33f9d1 |
507 | } |
054d8535 |
508 | |
1709795f |
509 | return NULL; |
510 | } |
511 | |
512 | /* |
513 | * Called to send data down the pty. |
514 | */ |
28d00fe4 |
515 | static int pty_send(void *handle, char *buf, int len) |
1709795f |
516 | { |
90cfd8f4 |
517 | if (pty_master_fd < 0) |
518 | return 0; /* ignore all writes if fd closed */ |
519 | |
054d8535 |
520 | while (len > 0) { |
521 | int ret = write(pty_master_fd, buf, len); |
522 | if (ret < 0) { |
523 | perror("write pty master"); |
524 | exit(1); |
525 | } |
526 | buf += ret; |
527 | len -= ret; |
528 | } |
1709795f |
529 | return 0; |
530 | } |
531 | |
90cfd8f4 |
532 | void pty_close(void) |
533 | { |
534 | if (pty_master_fd >= 0) { |
535 | close(pty_master_fd); |
536 | pty_master_fd = -1; |
537 | } |
538 | close(pty_utmp_helper_pipe); /* this causes utmp to be cleaned up */ |
539 | } |
540 | |
1709795f |
541 | /* |
542 | * Called to query the current socket sendability status. |
543 | */ |
28d00fe4 |
544 | static int pty_sendbuffer(void *handle) |
1709795f |
545 | { |
546 | return 0; |
547 | } |
548 | |
549 | /* |
550 | * Called to set the size of the window |
551 | */ |
28d00fe4 |
552 | static void pty_size(void *handle, int width, int height) |
1709795f |
553 | { |
88e6b9ca |
554 | struct winsize size; |
555 | |
f278d6f8 |
556 | pty_term_width = width; |
557 | pty_term_height = height; |
558 | |
559 | size.ws_row = (unsigned short)pty_term_height; |
560 | size.ws_col = (unsigned short)pty_term_width; |
a8327734 |
561 | size.ws_xpixel = (unsigned short) pty_term_width * |
562 | font_dimension(pty_frontend, 0); |
563 | size.ws_ypixel = (unsigned short) pty_term_height * |
564 | font_dimension(pty_frontend, 1); |
88e6b9ca |
565 | ioctl(pty_master_fd, TIOCSWINSZ, (void *)&size); |
1709795f |
566 | return; |
567 | } |
568 | |
569 | /* |
570 | * Send special codes. |
571 | */ |
28d00fe4 |
572 | static void pty_special(void *handle, Telnet_Special code) |
1709795f |
573 | { |
574 | /* Do nothing! */ |
575 | return; |
576 | } |
577 | |
28d00fe4 |
578 | static Socket pty_socket(void *handle) |
1709795f |
579 | { |
580 | return NULL; /* shouldn't ever be needed */ |
581 | } |
582 | |
28d00fe4 |
583 | static int pty_sendok(void *handle) |
1709795f |
584 | { |
585 | return 1; |
586 | } |
587 | |
28d00fe4 |
588 | static void pty_unthrottle(void *handle, int backlog) |
1709795f |
589 | { |
590 | /* do nothing */ |
591 | } |
592 | |
28d00fe4 |
593 | static int pty_ldisc(void *handle, int option) |
1709795f |
594 | { |
595 | return 0; /* neither editing nor echoing */ |
596 | } |
597 | |
b9d7bcad |
598 | static void pty_provide_ldisc(void *handle, void *ldisc) |
599 | { |
600 | /* This is a stub. */ |
601 | } |
602 | |
a8327734 |
603 | static void pty_provide_logctx(void *handle, void *logctx) |
604 | { |
605 | /* This is a stub. */ |
606 | } |
607 | |
28d00fe4 |
608 | static int pty_exitcode(void *handle) |
1709795f |
609 | { |
90cfd8f4 |
610 | if (!pty_child_dead) |
611 | return -1; /* not dead yet */ |
612 | else |
613 | return pty_exit_code; |
1709795f |
614 | } |
615 | |
616 | Backend pty_backend = { |
617 | pty_init, |
618 | pty_send, |
619 | pty_sendbuffer, |
620 | pty_size, |
621 | pty_special, |
622 | pty_socket, |
623 | pty_exitcode, |
624 | pty_sendok, |
625 | pty_ldisc, |
b9d7bcad |
626 | pty_provide_ldisc, |
a8327734 |
627 | pty_provide_logctx, |
1709795f |
628 | pty_unthrottle, |
629 | 1 |
630 | }; |