3315e8b3 |
1 | /* -*-c-*- |
2 | * |
65eb9899 |
3 | * $Id$ |
3315e8b3 |
4 | * |
5 | * Run remote commands |
6 | * |
7 | * (c) 1999 EBI |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of sw-tools. |
13 | * |
14 | * sw-tools is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * sw-tools is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with sw-tools; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
3315e8b3 |
29 | /*----- Header files ------------------------------------------------------*/ |
30 | |
31 | #include "config.h" |
32 | |
33 | #include <ctype.h> |
34 | #include <errno.h> |
35 | #include <signal.h> |
36 | #include <stdarg.h> |
37 | #include <stdio.h> |
38 | #include <stdlib.h> |
39 | #include <string.h> |
40 | |
41 | #include <sys/types.h> |
42 | #include <sys/time.h> |
43 | #include <fcntl.h> |
44 | #include <unistd.h> |
45 | |
46 | #include <sys/socket.h> |
47 | #include <sys/wait.h> |
48 | |
49 | #ifndef DECL_ENVIRON |
50 | extern char **environ; |
51 | #endif |
52 | |
53 | #include <mLib/alloc.h> |
fb28c8b9 |
54 | #include <mLib/bits.h> |
3315e8b3 |
55 | #include <mLib/dstr.h> |
56 | #include <mLib/exc.h> |
57 | #include <mLib/mdwopt.h> |
58 | #include <mLib/quis.h> |
59 | #include <mLib/report.h> |
60 | #include <mLib/sym.h> |
61 | |
62 | #define RCMD_LINK 0 |
63 | #include "sw_arch.h" |
64 | #include "sw_build.h" |
65 | #include "sw_env.h" |
66 | #include "sw_rsh.h" |
67 | |
68 | /*----- Data structures ---------------------------------------------------*/ |
69 | |
3315e8b3 |
70 | #define PKHEADSZ 3 |
71 | |
3315e8b3 |
72 | /*----- Static variables --------------------------------------------------*/ |
73 | |
74 | static int handler = 0; |
75 | static rcmd *rcmds = RCMD_LINK; |
76 | |
77 | /*----- Packet interface --------------------------------------------------*/ |
78 | |
79 | /* --- @pksend@ --- * |
80 | * |
81 | * Arguments: @sw_remote@ = pointer to the remote block |
82 | * @int type@ = packet type to send |
83 | * @const void *p@ = pointer to packet data |
84 | * @size_t sz@ = size of data to send |
85 | * |
86 | * Returns: Zero if it worked, nonzero otherwise. |
87 | * |
88 | * Use: Sends a data packet. If the type is `data', then `sz' may be |
f5c398f3 |
89 | * arbitrarily large and is divided into small enough chunks. |
3315e8b3 |
90 | * Otherwise it's an error to send a packet that's too big. |
91 | */ |
92 | |
93 | int pksend(sw_remote *r, int type, const void *p, size_t sz) |
94 | { |
0df5f2b4 |
95 | octet h[PKHEADSZ]; |
3315e8b3 |
96 | const char *q = p; |
97 | size_t chunk; |
98 | |
99 | /* --- Sort out error conditions --- */ |
100 | |
101 | if (sz > PKMAX && type != PKTYPE_DATA) { |
102 | errno = E2BIG; |
103 | return (-1); |
104 | } |
105 | |
106 | /* --- Main output loop --- */ |
107 | |
0df5f2b4 |
108 | h[2] = type; |
3315e8b3 |
109 | do { |
110 | |
111 | /* --- Set up the packet header --- */ |
112 | |
113 | chunk = (sz > PKMAX ? PKMAX : sz); |
0df5f2b4 |
114 | STORE16(h, chunk); |
3315e8b3 |
115 | |
116 | /* --- Write the packet header --- */ |
117 | |
118 | try_again: |
119 | if (write(r->fdout, &h, PKHEADSZ) < PKHEADSZ) { |
120 | if (errno == EINTR) |
121 | goto try_again; |
122 | return (-1); |
123 | } |
124 | |
125 | /* --- Write the payload, if there is one --- * |
126 | * |
127 | * Maybe the OS won't want to bite it all off in one go. |
128 | */ |
129 | |
130 | while (chunk) { |
131 | ssize_t n = write(r->fdout, q, chunk); |
132 | if (n < 0 && errno != EINTR) |
133 | return (-1); |
134 | if (n > 0) { |
135 | q += n; |
136 | chunk -= n; |
137 | sz -= n; |
138 | } |
139 | } |
140 | } while (sz); |
141 | |
142 | /* --- Done --- */ |
143 | |
144 | return (0); |
145 | } |
146 | |
147 | /* --- @pkrecv@ --- * |
148 | * |
149 | * Arguments: @sw_remote *r@ = remote block |
150 | * |
151 | * Returns: Packet type received, or @-1@ for an error. |
152 | * |
153 | * Use: Receives a packet from the remote host. The packet data is |
154 | * placed in the block's buffer, the block's packet length is |
155 | * diddled appropriately. |
156 | */ |
157 | |
158 | int pkrecv(sw_remote *r) |
159 | { |
0df5f2b4 |
160 | octet h[PKHEADSZ]; |
3315e8b3 |
161 | size_t sz; |
162 | char *p; |
163 | ssize_t n; |
164 | |
165 | /* --- Read the packet header --- */ |
166 | |
167 | sz = PKHEADSZ; |
168 | p = (char *)&h; |
169 | while (sz) { |
170 | n = read(r->fdin, p, sz); |
171 | if (n < 0 && errno != EINTR) |
172 | return (-1); |
173 | if (n == 0) |
174 | return (PKTYPE_EOF); |
175 | if (n > 0) { |
176 | p += n; |
177 | sz -= n; |
178 | } |
179 | } |
180 | |
181 | /* --- Hack for error messages --- * |
182 | * |
183 | * If it doesn't look like a valid packet, read a `chunk' and pretend it's |
184 | * data. This isn't too bad, because all the packet types are control |
185 | * codes, and are unlikely to be in a textual message. |
186 | * |
187 | * Normally what happens here is that something sitting before the `sw' |
188 | * program fails, reports a plain textual error, and exits. Grabbing the |
189 | * `last gasp' like this, then, traps that error message and allows |
190 | * something to report it. The rest ought to be completely silent, so I |
191 | * get an `unexpected eof' and then drop everything. |
192 | * |
193 | * This is certainly better than the behaviour otherwise, which is an |
194 | * @E2BIG@ message reported when the packet size is really ASCII |
195 | * characters. |
196 | */ |
197 | |
0df5f2b4 |
198 | if (h[2] >= PKTYPE_BOGUS) { |
3315e8b3 |
199 | memcpy(r->buf, &h, PKHEADSZ); |
200 | n = read(r->fdin, r->buf + PKHEADSZ, sizeof(r->buf) - PKHEADSZ); |
201 | if (n < 0) |
202 | return (-1); |
203 | r->sz = n + PKHEADSZ; |
204 | return (PKTYPE_DATA); |
205 | } |
206 | |
207 | /* --- Sort out what's going on --- */ |
208 | |
0df5f2b4 |
209 | sz = LOAD16(h); |
3315e8b3 |
210 | r->sz = sz; |
211 | if (!sz) |
0df5f2b4 |
212 | return (h[2]); |
3315e8b3 |
213 | if (sz > PKMAX) { |
214 | errno = E2BIG; |
215 | return (-1); |
216 | } |
217 | |
218 | /* --- Read the packet payload --- */ |
219 | |
220 | p = r->buf; |
221 | while (sz) { |
222 | n = read(r->fdin, p, sz); |
223 | if (n < 0 && errno != EINTR) |
224 | return (-1); |
225 | if (n == 0) |
226 | return (PKTYPE_EOF); |
227 | if (n > 0) { |
228 | p += n; |
229 | sz -= n; |
230 | } |
231 | } |
232 | |
0df5f2b4 |
233 | return (h[2]); |
3315e8b3 |
234 | } |
235 | |
236 | /*----- Error reporting and exit statuses --------------------------------*/ |
237 | |
238 | /* --- @swexit@ --- * |
239 | * |
240 | * Arguments: @sw_remote *r@ = remote context |
241 | * @int status@ = exit status to return |
242 | * |
243 | * Returns: Doesn't. |
244 | * |
245 | * Use: Reports the exit status via packet protocol and quits. |
246 | */ |
247 | |
248 | void swexit(sw_remote *r, int status) |
249 | { |
250 | unsigned char s = status; |
251 | pksend(r, PKTYPE_STATUS, &s, 1); |
252 | _exit(status); |
253 | } |
254 | |
255 | /* --- @swsignal@ --- * |
256 | * |
257 | * Arguments: @sw_remote *r@ = remote context |
258 | * @int sig@ = signal ocurrence to return |
259 | * |
260 | * Returns: Doesn't. |
261 | * |
262 | * Use: Reports a signalled-to-death status via packet protocol and |
263 | * quits. |
264 | */ |
265 | |
266 | void swsignal(sw_remote *r, int sig) |
267 | { |
268 | #if defined(HAVE_STRSIGNAL) |
269 | char *s = strsignal(sig); |
270 | #elif defined(HAVE__SYS_SIGLIST) |
271 | char *s = _sys_siglist[sig]; |
272 | #else |
273 | char s[16]; |
274 | sprintf(s, "signal %i", sig); |
275 | #endif |
276 | |
277 | pksend(r, PKTYPE_STATUS, s, strlen(s) + 1); |
278 | _exit(127); |
279 | } |
280 | |
281 | /* --- @swwait@ --- * |
282 | * |
283 | * Arguments: @sw_remote *r@ = remote context |
284 | * @int status@ = status answer from @wait@(2) |
285 | * |
286 | * Returns: Doesn't. |
287 | * |
288 | * Use: Reports a child's demise appropriately, and quits. |
289 | */ |
290 | |
291 | void swwait(sw_remote *r, int status) |
292 | { |
293 | if (WIFEXITED(status)) |
294 | swexit(r, WEXITSTATUS(status)); |
295 | else if (WIFSIGNALED(status)) |
296 | swsignal(r, WTERMSIG(status)); |
297 | else |
298 | swexit(r, 126); |
299 | } |
300 | |
301 | /* --- @swvprintf@ --- * |
302 | * |
303 | * Arguments: @sw_remote *r@ = remote context |
304 | * @const char *format@ = format string |
305 | * @va_list ap@ = things to format |
306 | * |
307 | * Returns: --- |
308 | * |
309 | * Use: Writes a string to the remote end. This is the low-level bit |
310 | * of @swprintf@. |
311 | */ |
312 | |
313 | void swvprintf(sw_remote *r, const char *format, va_list ap) |
314 | { |
315 | dstr d = DSTR_INIT; |
65eb9899 |
316 | dstr_vputf(&d, format, &ap); |
3315e8b3 |
317 | pksend(r, PKTYPE_DATA, d.buf, d.len); |
318 | dstr_destroy(&d); |
319 | } |
320 | |
321 | /* --- @swprintf@ --- * |
322 | * |
323 | * Arguments: @sw_remote *r@ = remote context |
324 | * @const char *format@ = format string |
325 | * @...@ = other arguments |
326 | * |
327 | * Returns: --- |
328 | * |
329 | * Use: Writes a string to the remote end. |
330 | */ |
331 | |
332 | void swprintf(sw_remote *r, const char *format, ...) |
333 | { |
334 | va_list ap; |
335 | va_start(ap, format); |
336 | swvprintf(r, format, ap); |
337 | va_end(ap); |
338 | } |
339 | |
340 | /* --- @swdie@ --- * |
341 | * |
342 | * Arguments: @sw_remote *r@ = remote context |
343 | * @int status@ = exit status to report |
344 | * @const char *format@ = format string to fill in |
345 | * @...@ = other arguments |
346 | * |
347 | * Returns: Doesn't. |
348 | * |
349 | * Use: Reports a message and quits. |
350 | */ |
351 | |
352 | void swdie(sw_remote *r, int status, const char *format, ...) |
353 | { |
354 | va_list ap; |
355 | dstr d = DSTR_INIT; |
356 | |
357 | va_start(ap, format); |
358 | dstr_putf(&d, "%s [remote]: ", QUIS); |
65eb9899 |
359 | dstr_vputf(&d, format, &ap); |
3315e8b3 |
360 | dstr_putc(&d, '\n'); |
361 | dstr_putz(&d); |
362 | va_end(ap); |
363 | pksend(r, PKTYPE_DATA, d.buf, d.len); |
364 | dstr_destroy(&d); |
365 | swexit(r, status); |
366 | } |
367 | |
368 | /*----- Command handling and dispatch -------------------------------------*/ |
369 | |
370 | /* --- @remote@ --- * |
371 | * |
372 | * Arguments: @sw_remote *r@ = pointer to remote block |
373 | * @const char *cmd@ = command to run |
374 | * @char *argv[]@ = argument array |
375 | * @char *env[]@ = environment variables |
376 | * |
377 | * Returns: Doesn't. Reports an exit status through packet protocol and |
378 | * quits. |
379 | * |
380 | * Use: Dispatches a remote command. At this point, the two code |
381 | * paths for local and remote invokation have joined again. |
382 | */ |
383 | |
384 | static void remote(sw_remote *r, const char *cmd, char *argv[], char *env[]) |
385 | { |
386 | struct rcmd *p, *chosen = 0; |
387 | size_t sz = strlen(cmd); |
388 | |
389 | /* --- Make sure that I can get the exit status of children --- */ |
390 | |
391 | signal(SIGCHLD, SIG_DFL); |
392 | |
393 | /* --- Fix up the environment --- */ |
394 | |
395 | { |
396 | sym_table t; |
397 | sym_create(&t); |
398 | env_import(&t, env); |
165b3d5c |
399 | if (env[0] && env != environ) { |
3315e8b3 |
400 | free(env); |
401 | env_import(&t, environ); |
402 | } |
403 | env_put(&t, "SW_ARCH", ARCH); |
404 | env_file(&t, DATADIR "/sw-env"); |
405 | env = env_export(&t); |
406 | } |
407 | |
408 | /* --- Dispatch to the command handler --- */ |
409 | |
410 | for (p = rcmds; p; p = p->next) { |
411 | if (strncmp(cmd, p->name, sz) == 0) { |
412 | if (p->name[sz] == 0) { |
413 | chosen = p; |
414 | break; |
415 | } else if (chosen) |
416 | swdie(r, 1, "ambiguous remote command name `%s'", cmd); |
417 | else |
418 | chosen = p; |
419 | } |
420 | } |
421 | if (!chosen) |
422 | swdie(r, 1, "unknown remote command name `%s'", cmd); |
423 | chosen->rcmd(r, argv, env); |
424 | } |
425 | |
426 | /*----- Remote invocation -------------------------------------------------*/ |
427 | |
428 | /* --- @sendargv@ --- * |
429 | * |
430 | * Arguments: @sw_remote *r@ = pointer to the remote context |
431 | * @int type@ = packet type to send with |
432 | * @char *v[]@ = pointer to the array to send |
433 | * |
434 | * Returns: Zero if OK, nonzero if it failed. |
435 | * |
436 | * Use: Sends something @argv@-shaped; i.e., an array of strings |
437 | * terminated by a null pointer. |
438 | */ |
439 | |
440 | static int sendargv(sw_remote *r, int type, char *v[]) |
441 | { |
442 | dstr d = DSTR_INIT; |
443 | int e; |
444 | |
445 | while (*v) { |
446 | dstr_puts(&d, *v); |
447 | d.len++; /* Make the null `real' */ |
448 | v++; |
449 | } |
450 | e = pksend(r, type, d.buf, d.len); |
451 | dstr_destroy(&d); |
452 | return (e); |
453 | } |
454 | |
455 | /* --- @snarfargv@ --- * |
456 | * |
457 | * Arguments: @const char *buf@ = pointer to buffer |
458 | * @size_t sz@ = size of buffer |
459 | * |
460 | * Returns: Pointer to argument array (allocated with @malloc@). |
461 | * |
462 | * Use: Snarfs the null-terminated strings in the buffer and returns |
463 | * an array of them. The whole lot, strings and array, is |
464 | * returned in one big chunk allocated from the heap. Note that |
465 | * this means it's OK to throw the initial buffer away. |
466 | */ |
467 | |
468 | static char **snarfargv(const char *buf, size_t sz) |
469 | { |
470 | /* --- Initial setup --- */ |
471 | |
472 | const char *p, *lim; |
473 | char *q; |
474 | size_t c; |
475 | char **v, **w; |
476 | |
477 | /* --- Pass one: count the number of arguments --- */ |
478 | |
479 | c = 0; |
480 | p = buf; |
481 | lim = p + sz; |
482 | while (p < lim) { |
483 | c++; |
484 | while (*p) { |
485 | p++; |
486 | if (p >= lim) |
487 | goto done_pass1; |
488 | } |
489 | p++; |
490 | } |
491 | done_pass1: |
492 | |
493 | /* --- Allocate memory for everything --- */ |
494 | |
495 | v = xmalloc((c + 1) * sizeof(char *) + sz + 1); |
496 | q = (char *)(v + c + 1); |
497 | memcpy(q, buf, sz); |
498 | |
499 | /* --- Pass two: set up the arrays --- */ |
500 | |
501 | lim = q + sz; |
502 | w = v; |
503 | while (q < lim) { |
504 | *w++ = q; |
505 | while (*q) { |
506 | q++; |
507 | if (q >= lim) |
508 | goto done_pass2; |
509 | } |
510 | q++; |
511 | } |
512 | done_pass2: |
513 | *w++ = 0; |
514 | *q++ = 0; |
515 | |
516 | /* --- Done --- */ |
517 | |
518 | return (v); |
519 | } |
520 | |
521 | /* --- @swrsh_remote@ --- * |
522 | * |
523 | * Arguments: @const char *cmd@ = the command to perform |
524 | * |
525 | * Returns: Doesn't. Reports an exit status through packet protocol and |
526 | * quits. |
527 | * |
528 | * Use: Handles the remote end of a remote job invokation. |
529 | */ |
530 | |
531 | void swrsh_remote(const char *cmd) |
532 | { |
533 | sw_remote r; |
534 | static char *dummy = 0; |
535 | char **argv = 0; |
536 | char **env = 0; |
537 | char *dir = 0; |
538 | r.fdin = 0; |
539 | r.fdout = 1; |
540 | |
165b3d5c |
541 | /* --- Object if stdin is a terminal --- */ |
542 | |
543 | if (isatty(STDIN_FILENO)) { |
544 | die(EXIT_FAILURE, |
545 | "don't use the `--remote' option unless " |
546 | "you know what you're doing."); |
547 | } |
548 | |
549 | /* --- Read packets from the remote host --- */ |
3315e8b3 |
550 | |
551 | for (;;) { |
552 | int t = pkrecv(&r); |
553 | switch (t) { |
554 | case -1: |
555 | swdie(&r, 1, "error reading packet: %s", strerror(errno)); |
556 | break; |
557 | case PKTYPE_EOF: |
558 | goto done; |
559 | case PKTYPE_ARGS: |
560 | if (argv) |
561 | free(argv); |
562 | argv = snarfargv(r.buf, r.sz); |
563 | break; |
564 | case PKTYPE_ENV: |
565 | if (env) |
566 | free(env); |
567 | env = snarfargv(r.buf, r.sz); |
568 | break; |
569 | case PKTYPE_DIR: |
570 | if (dir) |
571 | free(dir); |
572 | r.buf[r.sz] = 0; |
573 | dir = xstrdup(r.buf); |
574 | break; |
575 | case PKTYPE_GO: |
576 | goto done; |
577 | case PKTYPE_DATA: |
578 | case PKTYPE_STATUS: |
579 | swdie(&r, 1, "internal error: unexpected packet"); |
580 | break; |
581 | } |
582 | } |
583 | |
584 | /* --- Sort out any missing arguments --- */ |
585 | |
586 | done: |
587 | if (!argv) |
588 | argv = &dummy; |
589 | if (!env) |
590 | env = &dummy; |
591 | if (dir) |
592 | chdir(dir); |
593 | |
594 | /* --- Run the command --- */ |
595 | |
596 | TRY |
597 | remote(&r, cmd, argv, env); |
598 | CATCH switch (exc_type) { |
599 | case EXC_NOMEM: { |
600 | static char msg[] = "\nsw [remote]: not enough memory\n"; |
601 | pksend(&r, PKTYPE_DATA, msg, sizeof(msg) - 1); |
602 | swexit(&r, 1); |
603 | } break; |
604 | default: |
605 | swdie(&r, 1, "uncaught exception, type = %lx", exc_type); |
606 | } END_TRY; |
607 | } |
608 | |
609 | /*----- Starting remote jobs ----------------------------------------------*/ |
610 | |
611 | /* --- @sigchld@ --- * |
612 | * |
613 | * Arguments: @int sig@ = the signal number |
614 | * |
615 | * Returns: --- |
616 | * |
617 | * Use: Catches @SIGCHLD@ and reaps any children that have lost. |
618 | */ |
619 | |
620 | static void sigchld(int sig) |
621 | { |
63124806 |
622 | int e = errno; |
3315e8b3 |
623 | #ifdef DEBUG_SIGCHLD |
624 | int status; |
625 | while (waitpid(-1, &status, WNOHANG) > 0) { |
626 | if (WIFEXITED(status)) { |
627 | fprintf(stderr, "reap child with exit status %i\n", |
628 | WEXITSTATUS(status)); |
629 | } else if (WIFSIGNALED(status)) { |
630 | fprintf(stderr, "reap child killed by signal %s\n", |
631 | strsignal(WTERMSIG(status))); |
632 | } else |
633 | fprintf(stderr, "reaped bizarre child which is still alive\n"); |
634 | } |
635 | #else |
636 | while (waitpid(-1, 0, WNOHANG) > 0) |
637 | ; |
638 | #endif |
63124806 |
639 | errno = e; |
3315e8b3 |
640 | } |
641 | |
642 | /* --- @swrsh@ --- * |
643 | * |
644 | * Arguments: @sw_remote *r@ = remote process block to look after |
645 | * @const char *host@ = host to run on (0 for this one) |
646 | * @const char *cmd@ = remote command to run |
647 | * @char *argv[]@ = arguments to pass on |
648 | * |
649 | * Returns: Zero if it worked, nonzero if not. |
650 | * |
651 | * Use: Runs a command on a remote host. The argument array is |
652 | * mangled to come out OK at the far end. The environment and |
653 | * current directory are also passed along, and pop out the |
654 | * other end unmolested. |
655 | */ |
656 | |
657 | int swrsh(sw_remote *r, const char *host, const char *cmd, char *argv[]) |
658 | { |
659 | int sk[2]; |
660 | pid_t kid; |
661 | |
662 | /* --- Get a socket pair for communicating with the other end --- */ |
663 | |
664 | if (socketpair(PF_UNIX, SOCK_STREAM, 0, sk)) |
665 | goto tidy_0; |
666 | |
667 | /* --- Set up a signal handler --- */ |
668 | |
669 | if (!handler) { |
670 | struct sigaction sa; |
671 | sa.sa_handler = sigchld; |
f192155f |
672 | sa.sa_flags = SA_NOCLDSTOP; |
673 | #ifdef SA_RESTART |
674 | sa.sa_flags |= SA_RESTART; |
675 | #endif |
3315e8b3 |
676 | sigemptyset(&sa.sa_mask); |
677 | sigaction(SIGCHLD, &sa, 0); |
678 | handler = 1; |
679 | } |
680 | |
681 | /* --- Fork off a child to cope with stuff --- */ |
682 | |
683 | kid = fork(); |
684 | if (kid < 0) |
685 | goto tidy_1; |
686 | |
687 | /* --- Handle the child process --- * |
688 | * |
689 | * If this is a local job, then just loop around inside to handle the |
690 | * `remote' command. Otherwise crank up `rsh' and pass the command over to |
691 | * a remote copy of myself. |
692 | * |
693 | * (Why do I need a separate process for local jobs? I don't really, but |
694 | * it makes everything much simpler when running multiple jobs at the same |
695 | * time.) |
696 | */ |
697 | |
698 | if (kid == 0) { |
699 | close(sk[0]); |
700 | |
701 | /* --- Child end of a local job --- */ |
702 | |
95e672af |
703 | signal(SIGINT, SIG_DFL); |
704 | signal(SIGQUIT, SIG_DFL); |
705 | |
3315e8b3 |
706 | if (!host) { |
707 | r->fdin = r->fdout = sk[1]; |
708 | remote(r, cmd, argv, environ); |
709 | } |
710 | |
711 | /* --- Local child end of a remote job --- */ |
712 | |
713 | else { |
714 | const char *rsh; |
715 | dup2(sk[1], 0); |
716 | dup2(sk[1], 1); |
717 | dup2(sk[1], 2); |
718 | if (sk[1] > 2) |
719 | close(sk[1]); |
720 | rsh = getenv("SW_RSH"); |
721 | if (!rsh) |
722 | rsh = RSH; |
723 | execlp(rsh, rsh, host, PATH_SW, "--remote", cmd, (char *)0); |
724 | } |
725 | |
726 | /* --- I don't expect either to come back --- */ |
727 | |
728 | _exit(1); |
729 | } |
730 | |
731 | /* --- Local sort out of what to do --- * |
732 | * |
733 | * Either way, I've now got a socket tied to something which speaks my |
734 | * communication protocol. However, if this is a local job, then I can get |
735 | * going right away; otherwise, I've got to transmit various bits of |
736 | * information over the protocol. |
737 | */ |
738 | |
739 | r->fdin = r->fdout = sk[0]; |
740 | close(sk[1]); |
741 | |
742 | if (host) { |
743 | char buf[PKMAX]; |
744 | if (!getcwd(buf, sizeof(buf))) |
745 | goto tidy_1; |
746 | sendargv(r, PKTYPE_ARGS, argv); |
747 | sendargv(r, PKTYPE_ENV, environ); |
748 | pksend(r, PKTYPE_DIR, buf, strlen(buf) + 1); |
749 | pksend(r, PKTYPE_GO, 0, 0); |
750 | } |
751 | |
752 | /* --- Ready to rock'n'roll --- */ |
753 | |
754 | r->sz = 0; |
755 | return (0); |
756 | |
757 | /* --- Tidy up if it failed --- */ |
758 | |
759 | tidy_1: |
760 | close(sk[0]); |
761 | close(sk[1]); |
762 | tidy_0: |
763 | return (-1); |
764 | } |
765 | |
766 | /*----- Subcommands -------------------------------------------------------*/ |
767 | |
768 | /* --- @swrsh_rsh@ --- */ |
769 | |
770 | void rsw_rsh(sw_remote *r, char *argv[], char *env[]) |
771 | { |
772 | pid_t kid, k; |
773 | int pfd[2]; |
774 | int status; |
775 | |
776 | /* --- Create a pipe --- */ |
777 | |
778 | if (pipe(pfd)) |
779 | swdie(r, 1, "couldn't create pipe: %s", strerror(errno)); |
780 | |
781 | /* --- Start the child process up --- */ |
782 | |
783 | kid = fork(); |
784 | if (kid < 0) |
785 | swdie(r, 1, "fork failed: %s", strerror(errno)); |
786 | else if (kid == 0) { |
787 | int fd; |
788 | |
789 | /* --- Use my new environment --- */ |
790 | |
791 | environ = env; /* Yuk. */ |
792 | |
793 | /* --- Fiddle with pipe file descriptors --- */ |
794 | |
795 | close(pfd[0]); |
796 | dup2(pfd[1], 1); |
797 | dup2(pfd[1], 2); |
798 | if (pfd[1] > 2) |
799 | close(pfd[1]); |
800 | |
801 | /* --- Make sure it doesn't get any input --- */ |
802 | |
803 | close(0); |
804 | fd = open("/dev/null", O_RDONLY); |
805 | if (fd != 0) { |
806 | dup2(fd, 0); |
807 | close(fd); |
808 | } |
809 | |
810 | /* --- Run the program --- */ |
811 | |
812 | execvp(argv[0], argv); |
813 | die(1, "couldn't exec `%s': %s", argv[0], strerror(errno)); |
814 | } |
815 | |
816 | /* --- Read the data from the pipe until it closes --- */ |
817 | |
818 | close(pfd[1]); |
819 | for (;;) { |
820 | ssize_t n = read(pfd[0], r->buf, sizeof(r->buf)); |
821 | if (n < 0) |
822 | swdie(r, 1, "read error: %s", strerror(errno)); |
823 | else if (!n) |
824 | break; |
825 | else |
826 | pksend(r, PKTYPE_DATA, r->buf, n); |
827 | } |
828 | close(pfd[0]); |
829 | |
830 | /* --- Finally, reap the exit status and pass it on --- */ |
831 | |
832 | for (;;) { |
833 | k = wait(&status); |
834 | if (k == kid) |
835 | break; |
836 | if (k < 0) |
837 | swdie(r, 1, "error reaping child: %s", strerror(errno)); |
838 | } |
839 | swwait(r, status); |
840 | } |
841 | |
842 | /* --- @sw_rsh@ --- */ |
843 | |
844 | int sw_rsh(int argc, char *argv[]) |
845 | { |
846 | sw_remote r; |
847 | char *h; |
848 | int status = 1; |
849 | |
850 | /* --- Check the arguments --- */ |
851 | |
852 | if (argc < 3) |
853 | die(1, "Usage: rsh HOST|ARCH COMMAND [ARGS...]"); |
854 | |
855 | /* --- Translate architecture names into hostnames --- */ |
856 | |
857 | if (strcmp(argv[1], "-") == 0) |
858 | h = 0; |
859 | else { |
860 | archent *a = arch_lookup(argv[1], 0); |
861 | if (!a) |
862 | h = argv[1]; |
863 | else if (a->flags & archFlag_home) |
864 | h = 0; |
865 | else |
866 | h = a->host; |
867 | } |
868 | |
869 | /* --- Start the remote process --- */ |
870 | |
871 | if (swrsh(&r, h, "rsh", argv + 2)) |
872 | die(1, "remote shell failed: %s", strerror(errno)); |
873 | |
874 | /* --- Cope with packets from the remote process --- */ |
875 | |
876 | fflush(stdout); |
877 | for (;;) { |
878 | int t = pkrecv(&r); |
879 | switch (t) { |
880 | case -1: |
881 | die(1, "error reading packet: %s", strerror(errno)); |
882 | case PKTYPE_DATA: |
883 | write(STDOUT_FILENO, r.buf, r.sz); |
884 | break; |
885 | case PKTYPE_STATUS: |
886 | r.buf[r.sz] = 0; |
887 | if (r.sz > 1) { |
888 | status = 127; |
889 | moan("command exited due to signal: %s", r.buf); |
890 | } else { |
891 | status = r.buf[0]; |
892 | moan("command exited with status %i", r.buf[0]); |
893 | } |
894 | goto done; |
895 | case PKTYPE_EOF: |
896 | moan("command exited unexpectedly"); |
897 | goto done; |
898 | default: |
899 | die(1, "unexpected packet type"); |
900 | } |
901 | } |
902 | |
903 | /* --- Finished --- */ |
904 | |
905 | done: |
906 | close(r.fdin); |
907 | return (status); |
908 | } |
909 | |
910 | /*----- That's all, folks -------------------------------------------------*/ |