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 |
74aca06d |
16 | #define _GNU_SOURCE |
054d8535 |
17 | #include <features.h> |
18 | |
1709795f |
19 | #include <stdio.h> |
20 | #include <stdlib.h> |
054d8535 |
21 | #include <string.h> |
22 | #include <unistd.h> |
a0e16eb1 |
23 | #include <signal.h> |
054d8535 |
24 | #include <fcntl.h> |
88e6b9ca |
25 | #include <termios.h> |
be4f86de |
26 | #include <grp.h> |
755a6d84 |
27 | #include <utmp.h> |
28 | #include <pwd.h> |
29 | #include <time.h> |
a0e16eb1 |
30 | #include <sys/types.h> |
31 | #include <sys/wait.h> |
88e6b9ca |
32 | #include <sys/ioctl.h> |
0f33f9d1 |
33 | #include <errno.h> |
1709795f |
34 | |
35 | #include "putty.h" |
36 | |
37 | #ifndef FALSE |
38 | #define FALSE 0 |
39 | #endif |
40 | #ifndef TRUE |
41 | #define TRUE 1 |
42 | #endif |
43 | |
755a6d84 |
44 | #ifndef UTMP_FILE |
45 | #define UTMP_FILE "/var/run/utmp" |
46 | #endif |
47 | #ifndef WTMP_FILE |
48 | #define WTMP_FILE "/var/log/wtmp" |
49 | #endif |
50 | #ifndef LASTLOG_FILE |
51 | #ifdef _PATH_LASTLOG |
52 | #define LASTLOG_FILE _PATH_LASTLOG |
53 | #else |
54 | #define LASTLOG_FILE "/var/log/lastlog" |
55 | #endif |
56 | #endif |
57 | |
f51dc031 |
58 | /* |
59 | * Set up a default for vaguely sane systems. The idea is that if |
60 | * OMIT_UTMP is not defined, then at least one of the symbols which |
61 | * enable particular forms of utmp processing should be, if only so |
62 | * that a link error can warn you that you should have defined |
63 | * OMIT_UTMP if you didn't want any. Currently HAVE_PUTUTLINE is |
64 | * the only such symbol. |
65 | */ |
66 | #ifndef OMIT_UTMP |
67 | #if !defined HAVE_PUTUTLINE |
68 | #define HAVE_PUTUTLINE |
69 | #endif |
70 | #endif |
71 | |
74aca06d |
72 | static Config pty_cfg; |
73 | static int pty_master_fd; |
a8327734 |
74 | static void *pty_frontend; |
95c47834 |
75 | static char pty_name[FILENAME_MAX]; |
74aca06d |
76 | static int pty_signal_pipe[2]; |
f51dc031 |
77 | static int pty_stamped_utmp = 0; |
a0e16eb1 |
78 | static int pty_child_pid; |
95c47834 |
79 | static int pty_utmp_helper_pid, pty_utmp_helper_pipe; |
f278d6f8 |
80 | static int pty_term_width, pty_term_height; |
74aca06d |
81 | static int pty_child_dead, pty_finished; |
82 | static int pty_exit_code; |
755a6d84 |
83 | #ifndef OMIT_UTMP |
84 | static struct utmp utmp_entry; |
85 | #endif |
6169c758 |
86 | char **pty_argv; |
1d009ae7 |
87 | int use_pty_argv = TRUE; |
054d8535 |
88 | |
74aca06d |
89 | static void pty_close(void); |
90 | |
95c47834 |
91 | static void setup_utmp(char *ttyname, char *location) |
755a6d84 |
92 | { |
93 | #ifndef OMIT_UTMP |
94 | #ifdef HAVE_LASTLOG |
95 | struct lastlog lastlog_entry; |
96 | FILE *lastlog; |
97 | #endif |
98 | struct passwd *pw; |
755a6d84 |
99 | FILE *wtmp; |
100 | |
101 | pw = getpwuid(getuid()); |
102 | memset(&utmp_entry, 0, sizeof(utmp_entry)); |
103 | utmp_entry.ut_type = USER_PROCESS; |
104 | utmp_entry.ut_pid = getpid(); |
105 | strncpy(utmp_entry.ut_line, ttyname+5, lenof(utmp_entry.ut_line)); |
106 | strncpy(utmp_entry.ut_id, ttyname+8, lenof(utmp_entry.ut_id)); |
107 | strncpy(utmp_entry.ut_user, pw->pw_name, lenof(utmp_entry.ut_user)); |
108 | strncpy(utmp_entry.ut_host, location, lenof(utmp_entry.ut_host)); |
109 | time(&utmp_entry.ut_time); |
110 | |
111 | #if defined HAVE_PUTUTLINE |
112 | utmpname(UTMP_FILE); |
113 | setutent(); |
114 | pututline(&utmp_entry); |
115 | endutent(); |
116 | #endif |
117 | |
118 | if ((wtmp = fopen(WTMP_FILE, "a")) != NULL) { |
119 | fwrite(&utmp_entry, 1, sizeof(utmp_entry), wtmp); |
120 | fclose(wtmp); |
121 | } |
122 | |
123 | #ifdef HAVE_LASTLOG |
124 | memset(&lastlog_entry, 0, sizeof(lastlog_entry)); |
125 | strncpy(lastlog_entry.ll_line, ttyname+5, lenof(lastlog_entry.ll_line)); |
126 | strncpy(lastlog_entry.ll_host, location, lenof(lastlog_entry.ll_host)); |
127 | time(&lastlog_entry.ll_time); |
128 | if ((lastlog = fopen(LASTLOG_FILE, "r+")) != NULL) { |
129 | fseek(lastlog, sizeof(lastlog_entry) * getuid(), SEEK_SET); |
130 | fwrite(&lastlog_entry, 1, sizeof(lastlog_entry), lastlog); |
131 | fclose(lastlog); |
132 | } |
133 | #endif |
134 | |
f51dc031 |
135 | pty_stamped_utmp = 1; |
136 | |
755a6d84 |
137 | #endif |
138 | } |
139 | |
140 | static void cleanup_utmp(void) |
141 | { |
142 | #ifndef OMIT_UTMP |
143 | FILE *wtmp; |
144 | |
95c47834 |
145 | if (!pty_stamped_utmp) |
f51dc031 |
146 | return; |
147 | |
755a6d84 |
148 | utmp_entry.ut_type = DEAD_PROCESS; |
149 | memset(utmp_entry.ut_user, 0, lenof(utmp_entry.ut_user)); |
150 | time(&utmp_entry.ut_time); |
151 | |
152 | if ((wtmp = fopen(WTMP_FILE, "a")) != NULL) { |
153 | fwrite(&utmp_entry, 1, sizeof(utmp_entry), wtmp); |
154 | fclose(wtmp); |
155 | } |
156 | |
157 | memset(utmp_entry.ut_line, 0, lenof(utmp_entry.ut_line)); |
158 | utmp_entry.ut_time = 0; |
159 | |
160 | #if defined HAVE_PUTUTLINE |
161 | utmpname(UTMP_FILE); |
162 | setutent(); |
163 | pututline(&utmp_entry); |
164 | endutent(); |
165 | #endif |
166 | |
f51dc031 |
167 | pty_stamped_utmp = 0; /* ensure we never double-cleanup */ |
755a6d84 |
168 | #endif |
169 | } |
170 | |
a0e16eb1 |
171 | static void sigchld_handler(int signum) |
172 | { |
74aca06d |
173 | write(pty_signal_pipe[1], "x", 1); |
a0e16eb1 |
174 | } |
175 | |
755a6d84 |
176 | static void fatal_sig_handler(int signum) |
177 | { |
0f33f9d1 |
178 | putty_signal(signum, SIG_DFL); |
755a6d84 |
179 | cleanup_utmp(); |
180 | setuid(getuid()); |
181 | raise(signum); |
182 | } |
183 | |
95c47834 |
184 | static void pty_open_master(void) |
1709795f |
185 | { |
be4f86de |
186 | #ifdef BSD_PTYS |
95c47834 |
187 | const char chars1[] = "pqrstuvwxyz"; |
188 | const char chars2[] = "0123456789abcdef"; |
189 | const char *p1, *p2; |
190 | char master_name[20]; |
191 | struct group *gp; |
192 | |
193 | for (p1 = chars1; *p1; p1++) |
194 | for (p2 = chars2; *p2; p2++) { |
195 | sprintf(master_name, "/dev/pty%c%c", *p1, *p2); |
196 | pty_master_fd = open(master_name, O_RDWR); |
197 | if (pty_master_fd >= 0) { |
198 | if (geteuid() == 0 || |
199 | access(master_name, R_OK | W_OK) == 0) |
200 | goto got_one; |
201 | close(pty_master_fd); |
be4f86de |
202 | } |
95c47834 |
203 | } |
be4f86de |
204 | |
95c47834 |
205 | /* If we get here, we couldn't get a tty at all. */ |
206 | fprintf(stderr, "pterm: unable to open a pseudo-terminal device\n"); |
207 | exit(1); |
be4f86de |
208 | |
95c47834 |
209 | got_one: |
210 | strcpy(pty_name, master_name); |
211 | pty_name[5] = 't'; /* /dev/ptyXX -> /dev/ttyXX */ |
212 | |
213 | /* We need to chown/chmod the /dev/ttyXX device. */ |
214 | gp = getgrnam("tty"); |
215 | chown(pty_name, getuid(), gp ? gp->gr_gid : -1); |
216 | chmod(pty_name, 0600); |
be4f86de |
217 | #else |
054d8535 |
218 | pty_master_fd = open("/dev/ptmx", O_RDWR); |
219 | |
220 | if (pty_master_fd < 0) { |
221 | perror("/dev/ptmx: open"); |
222 | exit(1); |
223 | } |
224 | |
225 | if (grantpt(pty_master_fd) < 0) { |
226 | perror("grantpt"); |
227 | exit(1); |
228 | } |
229 | |
230 | if (unlockpt(pty_master_fd) < 0) { |
231 | perror("unlockpt"); |
232 | exit(1); |
233 | } |
234 | |
95c47834 |
235 | pty_name[FILENAME_MAX-1] = '\0'; |
236 | strncpy(pty_name, ptsname(pty_master_fd), FILENAME_MAX-1); |
be4f86de |
237 | #endif |
95c47834 |
238 | } |
054d8535 |
239 | |
95c47834 |
240 | /* |
241 | * Pre-initialisation. This is here to get around the fact that GTK |
242 | * doesn't like being run in setuid/setgid programs (probably |
243 | * sensibly). So before we initialise GTK - and therefore before we |
244 | * even process the command line - we check to see if we're running |
245 | * set[ug]id. If so, we open our pty master _now_, chown it as |
246 | * necessary, and drop privileges. We can always close it again |
247 | * later. If we're potentially going to be doing utmp as well, we |
248 | * also fork off a utmp helper process and communicate with it by |
249 | * means of a pipe; the utmp helper will keep privileges in order |
250 | * to clean up utmp when we exit (i.e. when its end of our pipe |
251 | * closes). |
252 | */ |
253 | void pty_pre_init(void) |
254 | { |
255 | pid_t pid; |
256 | int pipefd[2]; |
257 | |
0f33f9d1 |
258 | /* set the child signal handler straight away; it needs to be set |
259 | * before we ever fork. */ |
260 | putty_signal(SIGCHLD, sigchld_handler); |
95c47834 |
261 | pty_master_fd = -1; |
262 | |
263 | if (geteuid() != getuid() || getegid() != getgid()) { |
264 | pty_open_master(); |
39baeaa4 |
265 | } |
266 | |
95c47834 |
267 | #ifndef OMIT_UTMP |
39baeaa4 |
268 | /* |
95c47834 |
269 | * Fork off the utmp helper. |
755a6d84 |
270 | */ |
95c47834 |
271 | if (pipe(pipefd) < 0) { |
272 | perror("pterm: pipe"); |
273 | exit(1); |
274 | } |
275 | pid = fork(); |
276 | if (pid < 0) { |
277 | perror("pterm: fork"); |
278 | exit(1); |
279 | } else if (pid == 0) { |
280 | char display[128], buffer[128]; |
281 | int dlen, ret; |
282 | |
283 | close(pipefd[1]); |
284 | /* |
285 | * Now sit here until we receive a display name from the |
286 | * other end of the pipe, and then stamp utmp. Unstamp utmp |
287 | * again, and exit, when the pipe closes. |
288 | */ |
289 | |
290 | dlen = 0; |
291 | while (1) { |
292 | |
293 | ret = read(pipefd[0], buffer, lenof(buffer)); |
294 | if (ret <= 0) { |
295 | cleanup_utmp(); |
0f33f9d1 |
296 | _exit(0); |
95c47834 |
297 | } else if (!pty_stamped_utmp) { |
298 | if (dlen < lenof(display)) |
299 | memcpy(display+dlen, buffer, |
300 | min(ret, lenof(display)-dlen)); |
301 | if (buffer[ret-1] == '\0') { |
302 | /* |
303 | * Now we have a display name. NUL-terminate |
304 | * it, and stamp utmp. |
305 | */ |
306 | display[lenof(display)-1] = '\0'; |
307 | /* |
308 | * Trap as many fatal signals as we can in the |
309 | * hope of having the best possible chance to |
310 | * clean up utmp before termination. We are |
311 | * unfortunately unprotected against SIGKILL, |
312 | * but that's life. |
313 | */ |
0f33f9d1 |
314 | putty_signal(SIGHUP, fatal_sig_handler); |
315 | putty_signal(SIGINT, fatal_sig_handler); |
316 | putty_signal(SIGQUIT, fatal_sig_handler); |
317 | putty_signal(SIGILL, fatal_sig_handler); |
318 | putty_signal(SIGABRT, fatal_sig_handler); |
319 | putty_signal(SIGFPE, fatal_sig_handler); |
320 | putty_signal(SIGPIPE, fatal_sig_handler); |
321 | putty_signal(SIGALRM, fatal_sig_handler); |
322 | putty_signal(SIGTERM, fatal_sig_handler); |
323 | putty_signal(SIGSEGV, fatal_sig_handler); |
324 | putty_signal(SIGUSR1, fatal_sig_handler); |
325 | putty_signal(SIGUSR2, fatal_sig_handler); |
755a6d84 |
326 | #ifdef SIGBUS |
0f33f9d1 |
327 | putty_signal(SIGBUS, fatal_sig_handler); |
755a6d84 |
328 | #endif |
329 | #ifdef SIGPOLL |
0f33f9d1 |
330 | putty_signal(SIGPOLL, fatal_sig_handler); |
755a6d84 |
331 | #endif |
332 | #ifdef SIGPROF |
0f33f9d1 |
333 | putty_signal(SIGPROF, fatal_sig_handler); |
755a6d84 |
334 | #endif |
335 | #ifdef SIGSYS |
0f33f9d1 |
336 | putty_signal(SIGSYS, fatal_sig_handler); |
755a6d84 |
337 | #endif |
338 | #ifdef SIGTRAP |
0f33f9d1 |
339 | putty_signal(SIGTRAP, fatal_sig_handler); |
755a6d84 |
340 | #endif |
341 | #ifdef SIGVTALRM |
0f33f9d1 |
342 | putty_signal(SIGVTALRM, fatal_sig_handler); |
755a6d84 |
343 | #endif |
344 | #ifdef SIGXCPU |
0f33f9d1 |
345 | putty_signal(SIGXCPU, fatal_sig_handler); |
755a6d84 |
346 | #endif |
347 | #ifdef SIGXFSZ |
0f33f9d1 |
348 | putty_signal(SIGXFSZ, fatal_sig_handler); |
755a6d84 |
349 | #endif |
350 | #ifdef SIGIO |
0f33f9d1 |
351 | putty_signal(SIGIO, fatal_sig_handler); |
95c47834 |
352 | #endif |
95c47834 |
353 | setup_utmp(pty_name, display); |
354 | } |
355 | } |
356 | } |
357 | } else { |
358 | close(pipefd[0]); |
359 | pty_utmp_helper_pid = pid; |
360 | pty_utmp_helper_pipe = pipefd[1]; |
361 | } |
755a6d84 |
362 | #endif |
95c47834 |
363 | |
364 | /* Drop privs. */ |
365 | { |
366 | int gid = getgid(), uid = getuid(); |
367 | #ifndef HAVE_NO_SETRESUID |
368 | int setresgid(gid_t, gid_t, gid_t); |
369 | int setresuid(uid_t, uid_t, uid_t); |
370 | setresgid(gid, gid, gid); |
371 | setresuid(uid, uid, uid); |
372 | #else |
373 | setgid(getgid()); |
374 | setuid(getuid()); |
375 | #endif |
376 | } |
377 | } |
378 | |
74aca06d |
379 | int pty_select_result(int fd, int event) |
380 | { |
381 | char buf[4096]; |
382 | int ret; |
383 | int finished = FALSE; |
384 | |
385 | if (fd == pty_master_fd && event == 1) { |
386 | |
387 | ret = read(pty_master_fd, buf, sizeof(buf)); |
388 | |
389 | /* |
390 | * Clean termination condition is that either ret == 0, or ret |
391 | * < 0 and errno == EIO. Not sure why the latter, but it seems |
392 | * to happen. Boo. |
393 | */ |
394 | if (ret == 0 || (ret < 0 && errno == EIO)) { |
395 | /* |
396 | * We assume a clean exit if the pty has closed but the |
397 | * actual child process hasn't. The only way I can |
398 | * imagine this happening is if it detaches itself from |
399 | * the pty and goes daemonic - in which case the |
400 | * expected usage model would precisely _not_ be for |
401 | * the pterm window to hang around! |
402 | */ |
403 | finished = TRUE; |
404 | if (!pty_child_dead) |
405 | pty_exit_code = 0; |
406 | } else if (ret < 0) { |
407 | perror("read pty master"); |
408 | exit(1); |
409 | } else if (ret > 0) { |
410 | from_backend(pty_frontend, 0, buf, ret); |
411 | } |
412 | } else if (fd == pty_signal_pipe[0]) { |
413 | pid_t pid; |
414 | int status; |
415 | char c[1]; |
416 | |
417 | read(pty_signal_pipe[0], c, 1); /* ignore its value; it'll be `x' */ |
418 | |
419 | do { |
420 | pid = waitpid(-1, &status, WNOHANG); |
421 | if (pid == pty_child_pid && |
422 | (WIFEXITED(status) || WIFSIGNALED(status))) { |
423 | /* |
424 | * The primary child process died. We could keep |
425 | * the terminal open for remaining subprocesses to |
426 | * output to, but conventional wisdom seems to feel |
427 | * that that's the Wrong Thing for an xterm-alike, |
428 | * so we bail out now (though we don't necessarily |
429 | * _close_ the window, depending on the state of |
430 | * Close On Exit). This would be easy enough to |
431 | * change or make configurable if necessary. |
432 | */ |
433 | pty_exit_code = status; |
434 | pty_child_dead = TRUE; |
435 | finished = TRUE; |
436 | } |
437 | } while(pid > 0); |
438 | } |
439 | |
440 | if (finished && !pty_finished) { |
441 | uxsel_del(pty_master_fd); |
442 | pty_close(); |
443 | pty_master_fd = -1; |
444 | |
445 | pty_finished = TRUE; |
446 | |
447 | /* |
448 | * This is a slight layering-violation sort of hack: only |
449 | * if we're not closing on exit (COE is set to Never, or to |
450 | * Only On Clean and it wasn't a clean exit) do we output a |
451 | * `terminated' message. |
452 | */ |
453 | if (pty_cfg.close_on_exit == FORCE_OFF || |
454 | (pty_cfg.close_on_exit == AUTO && pty_exit_code != 0)) { |
455 | char message[512]; |
456 | if (WIFEXITED(pty_exit_code)) |
457 | sprintf(message, "\r\n[pterm: process terminated with exit" |
458 | " code %d]\r\n", WEXITSTATUS(pty_exit_code)); |
459 | else if (WIFSIGNALED(pty_exit_code)) |
460 | #ifdef HAVE_NO_STRSIGNAL |
461 | sprintf(message, "\r\n[pterm: process terminated on signal" |
462 | " %d]\r\n", WTERMSIG(pty_exit_code)); |
463 | #else |
464 | sprintf(message, "\r\n[pterm: process terminated on signal" |
465 | " %d (%.400s)]\r\n", WTERMSIG(pty_exit_code), |
466 | strsignal(WTERMSIG(pty_exit_code))); |
467 | #endif |
468 | from_backend(pty_frontend, 0, message, strlen(message)); |
469 | } |
470 | } |
471 | return !finished; |
472 | } |
473 | |
474 | static void pty_uxsel_setup(void) |
475 | { |
476 | uxsel_set(pty_master_fd, 1, pty_select_result); |
477 | uxsel_set(pty_signal_pipe[0], 1, pty_select_result); |
478 | } |
479 | |
95c47834 |
480 | /* |
481 | * Called to set up the pty. |
482 | * |
483 | * Returns an error message, or NULL on success. |
484 | * |
485 | * Also places the canonical host name into `realhost'. It must be |
486 | * freed by the caller. |
487 | */ |
86916870 |
488 | static char *pty_init(void *frontend, void **backend_handle, Config *cfg, |
887035a5 |
489 | char *host, int port, char **realhost, int nodelay) |
95c47834 |
490 | { |
491 | int slavefd; |
492 | pid_t pid, pgrp; |
7af753e6 |
493 | long windowid; |
95c47834 |
494 | |
a8327734 |
495 | pty_frontend = frontend; |
28d00fe4 |
496 | *backend_handle = NULL; /* we can't sensibly use this, sadly */ |
497 | |
74aca06d |
498 | pty_cfg = *cfg; /* structure copy */ |
86916870 |
499 | pty_term_width = cfg->width; |
500 | pty_term_height = cfg->height; |
f278d6f8 |
501 | |
95c47834 |
502 | if (pty_master_fd < 0) |
503 | pty_open_master(); |
504 | |
505 | /* |
506 | * Set the backspace character to be whichever of ^H and ^? is |
507 | * specified by bksp_is_delete. |
508 | */ |
509 | { |
510 | struct termios attrs; |
511 | tcgetattr(pty_master_fd, &attrs); |
86916870 |
512 | attrs.c_cc[VERASE] = cfg->bksp_is_delete ? '\177' : '\010'; |
95c47834 |
513 | tcsetattr(pty_master_fd, TCSANOW, &attrs); |
514 | } |
515 | |
516 | /* |
517 | * Stamp utmp (that is, tell the utmp helper process to do so), |
518 | * or not. |
519 | */ |
86916870 |
520 | if (!cfg->stamp_utmp) |
95c47834 |
521 | close(pty_utmp_helper_pipe); /* just let the child process die */ |
522 | else { |
a8327734 |
523 | char *location = get_x_display(pty_frontend); |
95c47834 |
524 | int len = strlen(location)+1, pos = 0; /* +1 to include NUL */ |
525 | while (pos < len) { |
526 | int ret = write(pty_utmp_helper_pipe, location+pos, len - pos); |
527 | if (ret < 0) { |
528 | perror("pterm: writing to utmp helper process"); |
529 | close(pty_utmp_helper_pipe); /* arrgh, just give up */ |
530 | break; |
531 | } |
532 | pos += ret; |
533 | } |
534 | } |
755a6d84 |
535 | |
7af753e6 |
536 | windowid = get_windowid(pty_frontend); |
537 | |
755a6d84 |
538 | /* |
054d8535 |
539 | * Fork and execute the command. |
540 | */ |
541 | pid = fork(); |
542 | if (pid < 0) { |
543 | perror("fork"); |
88e6b9ca |
544 | exit(1); |
054d8535 |
545 | } |
546 | |
547 | if (pid == 0) { |
548 | int i; |
549 | /* |
550 | * We are the child. |
551 | */ |
d37c2d81 |
552 | |
95c47834 |
553 | slavefd = open(pty_name, O_RDWR); |
d37c2d81 |
554 | if (slavefd < 0) { |
555 | perror("slave pty: open"); |
0f33f9d1 |
556 | _exit(1); |
d37c2d81 |
557 | } |
558 | |
054d8535 |
559 | close(pty_master_fd); |
054d8535 |
560 | fcntl(slavefd, F_SETFD, 0); /* don't close on exec */ |
561 | dup2(slavefd, 0); |
562 | dup2(slavefd, 1); |
563 | dup2(slavefd, 2); |
564 | setsid(); |
d37c2d81 |
565 | ioctl(slavefd, TIOCSCTTY, 1); |
566 | pgrp = getpid(); |
567 | tcsetpgrp(slavefd, pgrp); |
568 | setpgrp(); |
95c47834 |
569 | close(open(pty_name, O_WRONLY, 0)); |
054d8535 |
570 | setpgrp(); |
054d8535 |
571 | /* Close everything _else_, for tidiness. */ |
572 | for (i = 3; i < 1024; i++) |
573 | close(i); |
fe9548aa |
574 | { |
86916870 |
575 | char term_env_var[10 + sizeof(cfg->termtype)]; |
576 | sprintf(term_env_var, "TERM=%s", cfg->termtype); |
fe9548aa |
577 | putenv(term_env_var); |
578 | } |
7af753e6 |
579 | { |
580 | char windowid_env_var[40]; |
581 | sprintf(windowid_env_var, "WINDOWID=%ld", windowid); |
582 | putenv(windowid_env_var); |
583 | } |
8bf5c419 |
584 | /* |
585 | * SIGINT and SIGQUIT may have been set to ignored by our |
586 | * parent, particularly by things like sh -c 'pterm &' and |
587 | * some window managers. Reverse this for our child process. |
588 | */ |
0f33f9d1 |
589 | putty_signal(SIGINT, SIG_DFL); |
590 | putty_signal(SIGQUIT, SIG_DFL); |
6169c758 |
591 | if (pty_argv) |
592 | execvp(pty_argv[0], pty_argv); |
c8ee61b9 |
593 | else { |
594 | char *shell = getenv("SHELL"); |
595 | char *shellname; |
86916870 |
596 | if (cfg->login_shell) { |
c8ee61b9 |
597 | char *p = strrchr(shell, '/'); |
3d88e64d |
598 | shellname = snewn(2+strlen(shell), char); |
c8ee61b9 |
599 | p = p ? p+1 : shell; |
600 | sprintf(shellname, "-%s", p); |
601 | } else |
602 | shellname = shell; |
603 | execl(getenv("SHELL"), shellname, NULL); |
604 | } |
605 | |
054d8535 |
606 | /* |
607 | * If we're here, exec has gone badly foom. |
608 | */ |
609 | perror("exec"); |
0f33f9d1 |
610 | _exit(127); |
054d8535 |
611 | } else { |
a0e16eb1 |
612 | pty_child_pid = pid; |
613 | pty_child_dead = FALSE; |
74aca06d |
614 | pty_finished = FALSE; |
0f33f9d1 |
615 | } |
054d8535 |
616 | |
74aca06d |
617 | if (pipe(pty_signal_pipe) < 0) { |
618 | perror("pipe"); |
619 | exit(1); |
620 | } |
621 | pty_uxsel_setup(); |
622 | |
1709795f |
623 | return NULL; |
624 | } |
625 | |
626 | /* |
86916870 |
627 | * Stub routine (we don't have any need to reconfigure this backend). |
628 | */ |
629 | static void pty_reconfig(void *handle, Config *cfg) |
630 | { |
631 | } |
632 | |
633 | /* |
cb60dcb3 |
634 | * Stub routine (never called in pterm |
635 | */ |
636 | static void pty_free(void *handle) |
637 | { |
638 | } |
639 | |
640 | |
641 | /* |
1709795f |
642 | * Called to send data down the pty. |
643 | */ |
28d00fe4 |
644 | static int pty_send(void *handle, char *buf, int len) |
1709795f |
645 | { |
90cfd8f4 |
646 | if (pty_master_fd < 0) |
647 | return 0; /* ignore all writes if fd closed */ |
648 | |
054d8535 |
649 | while (len > 0) { |
650 | int ret = write(pty_master_fd, buf, len); |
651 | if (ret < 0) { |
652 | perror("write pty master"); |
653 | exit(1); |
654 | } |
655 | buf += ret; |
656 | len -= ret; |
657 | } |
1709795f |
658 | return 0; |
659 | } |
660 | |
74aca06d |
661 | static void pty_close(void) |
90cfd8f4 |
662 | { |
663 | if (pty_master_fd >= 0) { |
664 | close(pty_master_fd); |
665 | pty_master_fd = -1; |
666 | } |
667 | close(pty_utmp_helper_pipe); /* this causes utmp to be cleaned up */ |
668 | } |
669 | |
1709795f |
670 | /* |
671 | * Called to query the current socket sendability status. |
672 | */ |
28d00fe4 |
673 | static int pty_sendbuffer(void *handle) |
1709795f |
674 | { |
675 | return 0; |
676 | } |
677 | |
678 | /* |
679 | * Called to set the size of the window |
680 | */ |
28d00fe4 |
681 | static void pty_size(void *handle, int width, int height) |
1709795f |
682 | { |
88e6b9ca |
683 | struct winsize size; |
684 | |
f278d6f8 |
685 | pty_term_width = width; |
686 | pty_term_height = height; |
687 | |
688 | size.ws_row = (unsigned short)pty_term_height; |
689 | size.ws_col = (unsigned short)pty_term_width; |
a8327734 |
690 | size.ws_xpixel = (unsigned short) pty_term_width * |
691 | font_dimension(pty_frontend, 0); |
692 | size.ws_ypixel = (unsigned short) pty_term_height * |
693 | font_dimension(pty_frontend, 1); |
88e6b9ca |
694 | ioctl(pty_master_fd, TIOCSWINSZ, (void *)&size); |
1709795f |
695 | return; |
696 | } |
697 | |
698 | /* |
699 | * Send special codes. |
700 | */ |
28d00fe4 |
701 | static void pty_special(void *handle, Telnet_Special code) |
1709795f |
702 | { |
703 | /* Do nothing! */ |
704 | return; |
705 | } |
706 | |
125105d1 |
707 | /* |
708 | * Return a list of the special codes that make sense in this |
709 | * protocol. |
710 | */ |
711 | static const struct telnet_special *pty_get_specials(void *handle) |
712 | { |
713 | /* |
714 | * Hmm. When I get round to having this actually usable, it |
715 | * might be quite nice to have the ability to deliver a few |
716 | * well chosen signals to the child process - SIGINT, SIGTERM, |
717 | * SIGKILL at least. |
718 | */ |
719 | return NULL; |
720 | } |
721 | |
28d00fe4 |
722 | static Socket pty_socket(void *handle) |
1709795f |
723 | { |
724 | return NULL; /* shouldn't ever be needed */ |
725 | } |
726 | |
28d00fe4 |
727 | static int pty_sendok(void *handle) |
1709795f |
728 | { |
729 | return 1; |
730 | } |
731 | |
28d00fe4 |
732 | static void pty_unthrottle(void *handle, int backlog) |
1709795f |
733 | { |
734 | /* do nothing */ |
735 | } |
736 | |
28d00fe4 |
737 | static int pty_ldisc(void *handle, int option) |
1709795f |
738 | { |
739 | return 0; /* neither editing nor echoing */ |
740 | } |
741 | |
b9d7bcad |
742 | static void pty_provide_ldisc(void *handle, void *ldisc) |
743 | { |
744 | /* This is a stub. */ |
745 | } |
746 | |
a8327734 |
747 | static void pty_provide_logctx(void *handle, void *logctx) |
748 | { |
749 | /* This is a stub. */ |
750 | } |
751 | |
28d00fe4 |
752 | static int pty_exitcode(void *handle) |
1709795f |
753 | { |
74aca06d |
754 | if (!pty_finished) |
90cfd8f4 |
755 | return -1; /* not dead yet */ |
756 | else |
757 | return pty_exit_code; |
1709795f |
758 | } |
759 | |
760 | Backend pty_backend = { |
761 | pty_init, |
cb60dcb3 |
762 | pty_free, |
86916870 |
763 | pty_reconfig, |
1709795f |
764 | pty_send, |
765 | pty_sendbuffer, |
766 | pty_size, |
767 | pty_special, |
125105d1 |
768 | pty_get_specials, |
1709795f |
769 | pty_socket, |
770 | pty_exitcode, |
771 | pty_sendok, |
772 | pty_ldisc, |
b9d7bcad |
773 | pty_provide_ldisc, |
a8327734 |
774 | pty_provide_logctx, |
1709795f |
775 | pty_unthrottle, |
776 | 1 |
777 | }; |