Commit | Line | Data |
---|---|---|
48bb1f76 | 1 | /* -*-c-*- |
2 | * | |
48bb1f76 | 3 | * Source and target for executable programs |
4 | * | |
5 | * (c) 1999 Straylight/Edgeware | |
6 | */ | |
7 | ||
206212ca | 8 | /*----- Licensing notice --------------------------------------------------* |
48bb1f76 | 9 | * |
9155ea97 | 10 | * This file is part of the `fwd' port forwarder. |
48bb1f76 | 11 | * |
9155ea97 | 12 | * `fwd' is free software; you can redistribute it and/or modify |
48bb1f76 | 13 | * it under the terms of the GNU General Public License as published by |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
206212ca | 16 | * |
9155ea97 | 17 | * `fwd' is distributed in the hope that it will be useful, |
48bb1f76 | 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
206212ca | 21 | * |
48bb1f76 | 22 | * You should have received a copy of the GNU General Public License |
9155ea97 | 23 | * along with `fwd'; if not, write to the Free Software Foundation, |
48bb1f76 | 24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
25 | */ | |
26 | ||
9155ea97 | 27 | #include "fwd.h" |
48bb1f76 | 28 | |
29 | /*----- Data structures ---------------------------------------------------*/ | |
30 | ||
31 | /* --- Resource usage --- */ | |
32 | ||
33 | #ifdef HAVE_SETRLIMIT | |
34 | ||
35 | typedef struct xlimit { | |
1cd4a3bf MW |
36 | #define XLIMIT_ENTRY(name, constant) struct rlimit name; |
37 | RLIMITS(XLIMIT_ENTRY) | |
38 | #undef XLIMIT_ENTRY | |
48bb1f76 | 39 | } xlimit; |
40 | ||
41 | #endif | |
42 | ||
43 | /* --- Environment variable modifications --- */ | |
44 | ||
45 | typedef struct xenv { | |
46 | struct xenv *next; | |
47 | unsigned act; | |
48 | char *name; | |
49 | char *value; | |
50 | } xenv; | |
51 | ||
52 | #define XEA_SET 0u | |
53 | #define XEA_CLEAR 1u | |
54 | ||
55 | /* --- Program options --- */ | |
56 | ||
57 | typedef struct xopts { | |
58 | unsigned ref; | |
59 | unsigned f; | |
60 | const char *dir; | |
61 | const char *root; | |
62 | uid_t uid; | |
63 | gid_t gid; | |
64 | xenv *env; | |
65 | xenv **etail; | |
66 | #ifdef HAVE_SETRLIMIT | |
67 | xlimit xl; | |
68 | #endif | |
69 | } xopts; | |
70 | ||
71 | #define XF_NOLOG 1u | |
72 | ||
73 | /* --- Executable program arguments --- */ | |
74 | ||
75 | typedef struct xargs { | |
76 | unsigned ref; | |
77 | char *file; | |
78 | char *argv[1]; | |
79 | } xargs; | |
80 | ||
81 | #define XARGS_SZ(n) (sizeof(xargs) + sizeof(char *) * (n)) | |
82 | ||
83 | /* --- Executable endpoints --- */ | |
84 | ||
85 | typedef struct xept { | |
86 | endpt e; | |
87 | struct xept *next, *prev; | |
88 | pid_t kid; | |
28d2517c | 89 | endpt *f; |
372a98e2 | 90 | char *desc; |
48bb1f76 | 91 | int st; |
92 | xargs *xa; | |
93 | xopts *xo; | |
94 | selbuf err; | |
95 | } xept; | |
96 | ||
97 | #define XEF_CLOSE 16u | |
98 | #define XEF_EXIT 32u | |
99 | ||
100 | /* --- Executable program data --- */ | |
101 | ||
102 | typedef struct xdata { | |
103 | xargs *xa; | |
104 | xopts *xo; | |
105 | } xdata; | |
106 | ||
107 | /* --- Executable source block --- */ | |
108 | ||
109 | typedef struct xsource { | |
110 | source s; | |
111 | xdata x; | |
112 | } xsource; | |
113 | ||
114 | /* --- Executable target block --- */ | |
115 | ||
116 | typedef struct xtarget { | |
117 | target t; | |
118 | xdata x; | |
119 | } xtarget; | |
120 | ||
121 | /*----- Static variables --------------------------------------------------*/ | |
122 | ||
123 | static xopts exec_opts = { 1, 0, 0, 0, -1, -1, 0, &exec_opts.env }; | |
124 | static xept *xept_list; | |
125 | static sig xept_sig; | |
126 | static sym_table env; | |
127 | ||
128 | /*----- Fiddling about with resource limits -------------------------------*/ | |
129 | ||
130 | #ifdef HAVE_SETRLIMIT | |
131 | ||
132 | /* --- Table mapping user-level names to OS interface bits --- */ | |
133 | ||
134 | typedef struct rlimit_ent { | |
135 | const char *name; | |
136 | const char *rname; | |
137 | int r; | |
138 | size_t off; | |
139 | } rlimit_ent; | |
140 | ||
141 | static rlimit_ent rlimits[] = { | |
1cd4a3bf MW |
142 | #define TABLE_ENTRY(name, constant) \ |
143 | { #name, #constant, constant, offsetof(xlimit, name) }, | |
144 | RLIMITS(TABLE_ENTRY) | |
145 | #undef TABLE_ENTRY | |
48bb1f76 | 146 | { 0, 0, 0, 0 } |
147 | }; | |
148 | ||
149 | #define RLIMIT(xl, o) ((struct rlimit *)((char *)(xl) + (o))) | |
150 | ||
151 | /* --- @rlimit_get@ --- * | |
152 | * | |
153 | * Arguments: @xlimit *xl@ = pointer to limit structure | |
154 | * | |
155 | * Returns: --- | |
156 | * | |
157 | * Use: Initializes a limit structure from the current limits. | |
158 | */ | |
159 | ||
160 | static void rlimit_get(xlimit *xl) | |
161 | { | |
162 | rlimit_ent *r; | |
163 | ||
164 | for (r = rlimits; r->name; r++) { | |
165 | if (getrlimit(r->r, RLIMIT(xl, r->off))) { | |
166 | moan("couldn't read %s: %s", r->rname, strerror(errno)); | |
167 | _exit(1); | |
168 | } | |
169 | } | |
170 | } | |
171 | ||
172 | /* --- @rlimit_set@ --- * | |
173 | * | |
174 | * Arguments: @xlimit *xl@ = pointer to limit structure | |
175 | * | |
176 | * Returns: --- | |
177 | * | |
178 | * Use: Sets resource limits from the supplied limits structure. | |
179 | */ | |
180 | ||
181 | static void rlimit_set(xlimit *xl) | |
182 | { | |
183 | rlimit_ent *r; | |
184 | ||
185 | for (r = rlimits; r->name; r++) { | |
186 | if (setrlimit(r->r, RLIMIT(xl, r->off))) { | |
187 | moan("couldn't set %s: %s", r->rname, strerror(errno)); | |
188 | _exit(1); | |
189 | } | |
190 | } | |
191 | } | |
192 | ||
193 | /* --- @rlimit_option@ --- */ | |
194 | ||
195 | static int rlimit_option(xlimit *xl, scanner *sc) | |
196 | { | |
197 | CONF_BEGIN(sc, "rlimit", "resource limit") | |
198 | enum { w_soft, w_hard, w_both } which = w_both; | |
199 | rlimit_ent *chosen; | |
200 | struct rlimit *rl; | |
201 | long v; | |
202 | ||
203 | /* --- Find out which resource is being fiddled --- */ | |
204 | ||
205 | { | |
206 | rlimit_ent *r; | |
207 | ||
208 | chosen = 0; | |
209 | for (r = rlimits; r->name; r++) { | |
210 | if (strncmp(sc->d.buf, r->name, sc->d.len) == 0) { | |
211 | if (r->name[sc->d.len] == 0) { | |
212 | chosen = r; | |
213 | break; | |
214 | } else if (chosen) | |
215 | error(sc, "ambiguous resource limit name `%s'", sc->d.buf); | |
216 | else if (CONF_QUAL) | |
217 | chosen = r; | |
218 | } | |
219 | } | |
220 | if (!chosen) | |
221 | CONF_REJECT; | |
222 | token(sc); | |
223 | rl = RLIMIT(xl, chosen->off); | |
224 | } | |
225 | ||
226 | /* --- Look for hard or soft restrictions --- */ | |
227 | ||
228 | { | |
229 | int i; | |
230 | if (sc->t == '.') | |
231 | token(sc); | |
232 | if (sc->t == CTOK_WORD) { | |
233 | if ((i = conf_enum(sc, "soft,hard", | |
234 | ENUM_ABBREV | ENUM_NONE, "limit type")) != -1) | |
235 | which = i; | |
236 | } | |
237 | } | |
238 | ||
239 | /* --- Now read the new value --- */ | |
240 | ||
241 | if (sc->t == '=') | |
242 | token(sc); | |
243 | if (sc->t != CTOK_WORD) | |
244 | error(sc, "parse error, expected limit value"); | |
245 | ||
246 | if (conf_enum(sc, "unlimited,infinity", | |
247 | ENUM_ABBREV | ENUM_NONE, "limit value") > -1) | |
248 | v = RLIM_INFINITY; | |
249 | else { | |
250 | char *p; | |
251 | ||
252 | v = strtol(sc->d.buf, &p, 0); | |
253 | if (p == sc->d.buf) | |
254 | error(sc, "parse error, invalid limit value `%s'", sc->d.buf); | |
255 | switch (tolower((unsigned char)*p)) { | |
256 | case 0: break; | |
257 | case 'b': v *= 512; break; | |
258 | case 'g': v *= 1024; | |
259 | case 'm': v *= 1024; | |
260 | case 'k': v *= 1024; break; | |
261 | default: error(sc, "parse error, invalid limit scale `%c'", *p); | |
262 | } | |
263 | token(sc); | |
264 | } | |
265 | ||
266 | /* --- Store the limit value away --- */ | |
267 | ||
268 | switch (which) { | |
269 | case w_both: | |
270 | rl->rlim_cur = v; | |
271 | rl->rlim_max = v; | |
272 | break; | |
273 | case w_soft: | |
274 | if (v > rl->rlim_max) | |
bb2eca32 MW |
275 | error(sc, "soft limit %lu exceeds hard limit %lu for %s", |
276 | (unsigned long)v, (unsigned long)rl->rlim_max, | |
277 | chosen->rname); | |
48bb1f76 | 278 | rl->rlim_cur = v; |
279 | break; | |
280 | case w_hard: | |
281 | rl->rlim_max = v; | |
282 | if (rl->rlim_cur > v) | |
283 | rl->rlim_cur = v; | |
284 | break; | |
285 | } | |
286 | ||
287 | CONF_ACCEPT; | |
288 | CONF_END; | |
289 | } | |
290 | ||
291 | #endif | |
292 | ||
293 | /*----- Environment fiddling ----------------------------------------------*/ | |
294 | ||
295 | /* --- @xenv_option@ --- * | |
296 | * | |
297 | * Arguments: @xopts *xo@ = pointer to options block | |
298 | * @scanner *sc@ = pointer to scanner | |
299 | * | |
300 | * Returns: Nonzero if claimed | |
301 | * | |
302 | * Use: Parses environment variable assignments. | |
303 | */ | |
304 | ||
305 | static int xenv_option(xopts *xo, scanner *sc) | |
306 | { | |
307 | CONF_BEGIN(sc, "env", "environment") | |
308 | xenv *xe; | |
309 | ||
310 | /* --- Unset a variable --- */ | |
311 | ||
312 | if (strcmp(sc->d.buf, "unset") == 0) { | |
313 | token(sc); | |
314 | if (sc->t != CTOK_WORD) | |
315 | error(sc, "parse error, expected environment variable name"); | |
316 | xe = CREATE(xenv); | |
317 | xe->name = xstrdup(sc->d.buf); | |
318 | xe->value = 0; | |
319 | xe->act = XEA_SET; | |
320 | token(sc); | |
321 | goto link; | |
322 | } | |
323 | ||
324 | /* --- Clear the entire environment --- */ | |
325 | ||
326 | if (strcmp(sc->d.buf, "clear") == 0) { | |
327 | token(sc); | |
328 | xe = CREATE(xenv); | |
329 | xe->act = XEA_CLEAR; | |
330 | goto link; | |
331 | } | |
332 | ||
333 | /* --- Allow `set' to be omitted if there's a prefix --- */ | |
334 | ||
335 | if (strcmp(sc->d.buf, "set") == 0) | |
336 | token(sc); | |
337 | else if (!CONF_QUAL) | |
338 | CONF_REJECT; | |
339 | ||
340 | /* --- Set a variable --- */ | |
341 | ||
342 | if (sc->t != CTOK_WORD) | |
343 | error(sc, "parse error, expected environment variable name"); | |
344 | xe = CREATE(xenv); | |
345 | xe->name = xstrdup(sc->d.buf); | |
346 | token(sc); | |
347 | if (sc->t == '=') | |
348 | token(sc); | |
349 | if (sc->t != CTOK_WORD) | |
350 | error(sc, "parse error, expected environment variable value"); | |
351 | xe->value = xstrdup(sc->d.buf); | |
352 | xe->act = XEA_SET; | |
353 | token(sc); | |
354 | goto link; | |
355 | ||
356 | link: | |
357 | xe->next = 0; | |
358 | *xo->etail = xe; | |
359 | xo->etail = &xe->next; | |
360 | CONF_ACCEPT; | |
361 | ||
362 | /* --- Nothing else to try --- */ | |
363 | ||
364 | CONF_END; | |
365 | } | |
366 | ||
367 | /* --- @xenv_apply@ --- * | |
368 | * | |
369 | * Arguments: @xenv *xe@ = pointer to a variable change list | |
370 | * | |
371 | * Returns: --- | |
372 | * | |
373 | * Use: Modifies the environment (in @env@) according to the list. | |
374 | */ | |
375 | ||
376 | static void xenv_apply(xenv *xe) | |
377 | { | |
378 | while (xe) { | |
379 | switch (xe->act) { | |
380 | case XEA_SET: | |
381 | env_put(&env, xe->name, xe->value); | |
382 | break; | |
383 | case XEA_CLEAR: | |
384 | env_destroy(&env); | |
385 | sym_create(&env); | |
386 | break; | |
387 | } | |
388 | xe = xe->next; | |
389 | } | |
390 | } | |
391 | ||
392 | /* --- @xenv_destroy@ --- * | |
393 | * | |
394 | * Arguments: @xenv *xe@ = pointer to a variable change list | |
395 | * | |
396 | * Returns: --- | |
397 | * | |
398 | * Use: Frees the memory used by an environment variable change list. | |
399 | */ | |
400 | ||
401 | static void xenv_destroy(xenv *xe) | |
402 | { | |
403 | while (xe) { | |
404 | xenv *xxe = xe; | |
405 | xe = xe->next; | |
b0805b27 | 406 | xfree(xxe->name); |
48bb1f76 | 407 | if (xxe->value) |
b0805b27 | 408 | xfree(xxe->value); |
48bb1f76 | 409 | DESTROY(xxe); |
410 | } | |
411 | } | |
412 | ||
413 | /*----- Miscellaneous good things -----------------------------------------*/ | |
414 | ||
415 | /* --- @x_tidy@ --- * | |
416 | * | |
417 | * Arguments: @xargs *xa@ = pointer to an arguments block | |
418 | * @xopts *xo@ = pointer to an options block | |
419 | * | |
420 | * Returns: --- | |
421 | * | |
422 | * Use: Releases a reference to argument and options blocks. | |
423 | */ | |
424 | ||
425 | static void x_tidy(xargs *xa, xopts *xo) | |
426 | { | |
427 | xa->ref--; | |
428 | if (!xa->ref) | |
b0805b27 | 429 | xfree(xa); |
48bb1f76 | 430 | |
431 | xo->ref--; | |
432 | if (!xo->ref) { | |
433 | xenv_destroy(xo->env); | |
434 | DESTROY(xo); | |
435 | } | |
436 | } | |
437 | ||
438 | /*----- Executable endpoints ----------------------------------------------*/ | |
439 | ||
440 | /* --- @attach@ --- */ | |
441 | ||
f00786b9 | 442 | static void xept_error(char */*p*/, size_t /*len*/, void */*v*/); |
48bb1f76 | 443 | |
444 | static void xept_attach(endpt *e, reffd *in, reffd *out) | |
445 | { | |
446 | xept *xe = (xept *)e; | |
447 | pid_t kid; | |
448 | int fd[2]; | |
449 | ||
450 | /* --- Make a pipe for standard error --- */ | |
451 | ||
452 | if (pipe(fd)) { | |
d935f68b | 453 | fw_log(NOW, "[%s] couldn't create pipe: %s", xe->desc, strerror(errno)); |
48bb1f76 | 454 | return; |
455 | } | |
456 | fdflags(fd[0], O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); | |
457 | ||
458 | /* --- Fork a child, and handle an error if there was one --- */ | |
459 | ||
460 | if ((kid = fork()) == -1) { | |
d935f68b | 461 | fw_log(NOW, "[%s] couldn't fork: %s", xe->desc, strerror(errno)); |
48bb1f76 | 462 | close(fd[0]); |
463 | close(fd[1]); | |
464 | return; | |
465 | } | |
466 | ||
467 | /* --- Do the child thing --- */ | |
468 | ||
469 | if (kid == 0) { | |
470 | xopts *xo = xe->xo; | |
76654703 | 471 | mdup_fd md[3]; |
48bb1f76 | 472 | |
473 | /* --- Fiddle with the file descriptors --- * | |
474 | * | |
475 | * Attach the other endpoint's descriptors to standard input and output. | |
476 | * Attach my pipe to standard error. Mark everything as blocking and | |
477 | * not-to-be-closed-on-exec at this end. | |
478 | */ | |
479 | ||
480 | close(fd[0]); | |
76654703 MW |
481 | md[0].cur = in->fd; md[0].want = STDIN_FILENO; |
482 | md[1].cur = out->fd; md[1].want = STDOUT_FILENO; | |
483 | md[2].cur = fd[1]; md[2].want = STDERR_FILENO; | |
484 | if (mdup(md, 3)) { | |
48bb1f76 | 485 | moan("couldn't manipulate file descriptors: %s", strerror(errno)); |
486 | _exit(1); | |
487 | } | |
488 | ||
48bb1f76 | 489 | fdflags(STDIN_FILENO, O_NONBLOCK, 0, FD_CLOEXEC, 0); |
490 | fdflags(STDOUT_FILENO, O_NONBLOCK, 0, FD_CLOEXEC, 0); | |
491 | fdflags(STDERR_FILENO, O_NONBLOCK, 0, FD_CLOEXEC, 0); | |
492 | ||
493 | /* --- First of all set the @chroot@ prison --- */ | |
494 | ||
495 | if (xo->root && chroot(xo->root)) { | |
496 | moan("couldn't set `%s' as filesystem root: %s", | |
497 | xo->root, strerror(errno)); | |
498 | _exit(1); | |
499 | } | |
500 | ||
501 | /* --- Now set the current directory --- */ | |
502 | ||
503 | if (xo->dir ? chdir(xo->dir) : xo->root ? chdir("/") : 0) { | |
504 | moan("couldn't set `%s' as current directory: %s", | |
505 | xo->dir ? xo->dir : "/", strerror(errno)); | |
506 | _exit(1); | |
507 | } | |
508 | ||
509 | /* --- Set the resource limits --- */ | |
510 | ||
511 | #ifdef HAVE_SETRLIMIT | |
512 | rlimit_set(&xo->xl); | |
513 | #endif | |
514 | ||
515 | /* --- Set group id --- */ | |
516 | ||
71db0fbd | 517 | if (xo->gid != (gid_t)-1) { |
48bb1f76 | 518 | if (setgid(xo->gid)) { |
519 | moan("couldn't set gid %i: %s", xo->gid, strerror(errno)); | |
520 | _exit(1); | |
521 | } | |
522 | #ifdef HAVE_SETGROUPS | |
523 | if (setgroups(1, &xo->gid)) | |
524 | moan("warning: couldn't set group list to %i: %s", xo->gid, | |
525 | strerror(errno)); | |
526 | #endif | |
527 | } | |
528 | ||
529 | /* --- Set uid --- */ | |
530 | ||
71db0fbd | 531 | if (xo->uid != (uid_t)-1) { |
48bb1f76 | 532 | if (setuid(xo->uid)) { |
533 | moan("couldn't set uid %i: %s", xo->uid, strerror(errno)); | |
534 | _exit(1); | |
535 | } | |
536 | } | |
537 | ||
538 | /* --- Play with signal dispositions --- */ | |
539 | ||
540 | signal(SIGPIPE, SIG_DFL); | |
541 | ||
542 | /* --- Fiddle with the environment --- */ | |
543 | ||
544 | xenv_apply(exec_opts.env); | |
545 | xenv_apply(xe->xo->env); | |
546 | environ = env_export(&env); | |
547 | ||
548 | /* --- Run the program --- */ | |
549 | ||
550 | execvp(xe->xa->file, xe->xa->argv); | |
551 | moan("couldn't execute `%s': %s", xe->xa->file, strerror(errno)); | |
552 | _exit(127); | |
553 | } | |
554 | ||
555 | /* --- The child's done; see to the parent --- */ | |
556 | ||
557 | xe->kid = kid; | |
558 | selbuf_init(&xe->err, sel, fd[0], xept_error, xe); | |
559 | close(fd[1]); | |
560 | xe->next = xept_list; | |
561 | xe->prev = 0; | |
562 | if (xept_list) | |
563 | xept_list->prev = xe; | |
564 | xept_list = xe; | |
565 | if (!(xe->xo->f & XF_NOLOG)) | |
d935f68b | 566 | fw_log(NOW, "[%s] started with pid %i", xe->desc, kid); |
48bb1f76 | 567 | fw_inc(); |
568 | return; | |
569 | } | |
570 | ||
28d2517c | 571 | /* --- @xept_file@ --- */ |
572 | ||
573 | static void xept_file(endpt *e, endpt *f) | |
574 | { | |
575 | xept *xe = (xept *)e; | |
576 | xe->f = f; | |
577 | } | |
578 | ||
48bb1f76 | 579 | /* --- @xept_close@ --- */ |
580 | ||
581 | static void xept_close(endpt *e) | |
582 | { | |
583 | xept *xe = (xept *)e; | |
584 | if (xe->kid == -1) { | |
28d2517c | 585 | if (xe->f) |
586 | xe->f->ops->close(xe->f); | |
48bb1f76 | 587 | x_tidy(xe->xa, xe->xo); |
588 | DESTROY(xe); | |
589 | fw_dec(); | |
590 | } | |
591 | } | |
592 | ||
593 | /* --- @xept_destroy@ --- */ | |
594 | ||
595 | static void xept_destroy(xept *xe) | |
596 | { | |
597 | /* --- First emit the news about the process --- */ | |
598 | ||
599 | if (xe->xo->f & XF_NOLOG) | |
600 | /* Nothin' doin' */; | |
601 | else if (WIFEXITED(xe->st)) { | |
602 | if (WEXITSTATUS(xe->st) == 0) | |
d935f68b | 603 | fw_log(NOW, "[%s] pid %i exited successfully", xe->desc, xe->kid); |
48bb1f76 | 604 | else { |
d935f68b | 605 | fw_log(NOW, "[%s] pid %i failed: status %i", |
48bb1f76 | 606 | xe->desc, xe->kid, WEXITSTATUS(xe->st)); |
607 | } | |
608 | } else if (WIFSIGNALED(xe->st)) { | |
609 | const char *s; | |
610 | #ifdef HAVE_STRSIGNAL | |
611 | s = strsignal(WTERMSIG(xe->st)); | |
612 | #elif HAVE__SYS_SIGLIST | |
613 | s = _sys_siglist[WTERMSIG(xe->st)]; | |
614 | #else | |
615 | char buf[32]; | |
616 | sprintf(buf, "signal %i", WTERMSIG(xe->st)); | |
617 | s = buf; | |
618 | #endif | |
d935f68b | 619 | fw_log(NOW, "[%s] pid %i failed: %s", xe->desc, xe->kid, s); |
48bb1f76 | 620 | } else |
d935f68b MW |
621 | fw_log(NOW, "[%s] pid %i failed: unrecognized status", |
622 | xe->desc, xe->kid); | |
48bb1f76 | 623 | |
624 | /* --- Free up the parent-side resources --- */ | |
625 | ||
626 | if (xe->next) | |
627 | xe->next->prev = xe->prev; | |
628 | if (xe->prev) | |
629 | xe->prev->next = xe->next; | |
630 | else | |
631 | xept_list = xe->next; | |
632 | ||
b0805b27 | 633 | xfree(xe->desc); |
28d2517c | 634 | if (xe->f) |
635 | xe->f->ops->close(xe->f); | |
48bb1f76 | 636 | x_tidy(xe->xa, xe->xo); |
637 | fw_dec(); | |
638 | DESTROY(xe); | |
639 | } | |
640 | ||
641 | /* --- @xept_chld@ --- * | |
642 | * | |
643 | * Arguments: @int n@ = signal number | |
644 | * @void *p@ = uninteresting pointer | |
645 | * | |
646 | * Returns: --- | |
647 | * | |
648 | * Use: Deals with child death situations. | |
649 | */ | |
650 | ||
651 | static void xept_chld(int n, void *p) | |
652 | { | |
653 | pid_t kid; | |
654 | int st; | |
655 | ||
656 | while ((kid = waitpid(-1, &st, WNOHANG)) > 0) { | |
657 | xept *xe = xept_list; | |
658 | while (xe) { | |
659 | xept *xxe = xe; | |
660 | xe = xe->next; | |
661 | if (kid == xxe->kid) { | |
662 | xxe->st = st; | |
663 | xxe->e.f |= XEF_EXIT; | |
664 | if (xxe->e.f & XEF_CLOSE) | |
665 | xept_destroy(xxe); | |
666 | break; | |
667 | } | |
668 | } | |
669 | } | |
670 | } | |
671 | ||
672 | /* --- @xept_error@ --- * | |
673 | * | |
674 | * Arguments: @char *p@ = pointer to string read from stderr | |
f00786b9 | 675 | * @size_t len@ = length of the string |
48bb1f76 | 676 | * @void *v@ = pointer to by endpoint |
677 | * | |
678 | * Returns: --- | |
679 | * | |
680 | * Use: Handles error reports from a child process. | |
681 | */ | |
682 | ||
f00786b9 | 683 | static void xept_error(char *p, size_t len, void *v) |
48bb1f76 | 684 | { |
685 | xept *xe = v; | |
686 | if (p) | |
d935f68b | 687 | fw_log(NOW, "[%s] pid %i: %s", xe->desc, xe->kid, p); |
48bb1f76 | 688 | else { |
48bb1f76 | 689 | close(xe->err.reader.fd); |
e68b88bf | 690 | selbuf_destroy(&xe->err); |
48bb1f76 | 691 | xe->e.f |= XEF_CLOSE; |
692 | if (xe->e.f & XEF_EXIT) | |
693 | xept_destroy(xe); | |
694 | } | |
695 | } | |
696 | ||
697 | /* --- Endpoint operations --- */ | |
698 | ||
28d2517c | 699 | static endpt_ops xept_ops = { xept_attach, xept_file, 0, xept_close }; |
48bb1f76 | 700 | |
701 | /*----- General operations on sources and targets -------------------------*/ | |
702 | ||
703 | /* --- @exec_init@ --- * | |
704 | * | |
705 | * Arguments: --- | |
706 | * | |
707 | * Returns: --- | |
708 | * | |
709 | * Use: Initializes the executable problem source and target. | |
710 | */ | |
711 | ||
712 | void exec_init(void) | |
713 | { | |
71db0fbd | 714 | #ifdef HAVE_SETRLIMIT |
48bb1f76 | 715 | rlimit_get(&exec_opts.xl); |
71db0fbd | 716 | #endif |
48bb1f76 | 717 | sig_add(&xept_sig, SIGCHLD, xept_chld, 0); |
718 | sym_create(&env); | |
719 | env_import(&env, environ); | |
720 | } | |
721 | ||
722 | /* --- @exec_option@ --- */ | |
723 | ||
724 | static int exec_option(xdata *x, scanner *sc) | |
725 | { | |
726 | xopts *xo = x ? x->xo : &exec_opts; | |
727 | ||
728 | CONF_BEGIN(sc, "exec", "executable"); | |
729 | ||
730 | /* --- Logging settings --- */ | |
731 | ||
732 | if (strcmp(sc->d.buf, "logging") == 0 || | |
733 | strcmp(sc->d.buf, "log") == 0) { | |
734 | token(sc); | |
735 | if (sc->t == '=') | |
736 | token(sc); | |
737 | if (conf_enum(sc, "no,yes", ENUM_ABBREV, "logging status")) | |
738 | xo->f &= ~XF_NOLOG; | |
739 | else | |
740 | xo->f |= XF_NOLOG; | |
741 | CONF_ACCEPT; | |
742 | } | |
743 | ||
744 | /* --- Current directory setting --- * | |
745 | * | |
746 | * Lots of possibilities to guard against possible brainoes. | |
747 | */ | |
748 | ||
749 | if (strcmp(sc->d.buf, "dir") == 0 || | |
750 | strcmp(sc->d.buf, "cd") == 0 || | |
751 | strcmp(sc->d.buf, "chdir") == 0 || | |
752 | strcmp(sc->d.buf, "cwd") == 0) { | |
753 | dstr d = DSTR_INIT; | |
754 | token(sc); | |
755 | if (sc->t == '=') | |
756 | token(sc); | |
35a142ca | 757 | conf_fname(sc, &d); |
48bb1f76 | 758 | xo->dir = xstrdup(d.buf); |
759 | dstr_destroy(&d); | |
760 | CONF_ACCEPT; | |
761 | } | |
762 | ||
763 | /* --- Set a chroot prison --- */ | |
764 | ||
765 | if (strcmp(sc->d.buf, "root") == 0 || | |
206212ca | 766 | strcmp(sc->d.buf, "chroot") == 0) { |
48bb1f76 | 767 | dstr d = DSTR_INIT; |
768 | token(sc); | |
769 | if (sc->t == '=') | |
770 | token(sc); | |
35a142ca | 771 | conf_fname(sc, &d); |
48bb1f76 | 772 | xo->root = xstrdup(d.buf); |
773 | dstr_destroy(&d); | |
774 | CONF_ACCEPT; | |
775 | } | |
776 | ||
777 | /* --- Set the target user id --- */ | |
778 | ||
779 | if (strcmp(sc->d.buf, "uid") == 0 || | |
780 | strcmp(sc->d.buf, "user") == 0) { | |
781 | token(sc); | |
782 | if (sc->t == '=') | |
783 | token(sc); | |
784 | if (sc->t != CTOK_WORD) | |
785 | error(sc, "parse error, expected user name or uid"); | |
786 | if (isdigit((unsigned char)*sc->d.buf)) | |
787 | xo->uid = atoi(sc->d.buf); | |
788 | else { | |
789 | struct passwd *pw = getpwnam(sc->d.buf); | |
790 | if (!pw) | |
791 | error(sc, "unknown user name `%s'", sc->d.buf); | |
792 | xo->uid = pw->pw_uid; | |
793 | } | |
794 | token(sc); | |
795 | CONF_ACCEPT; | |
796 | } | |
797 | ||
798 | /* --- Set the target group id --- */ | |
799 | ||
800 | if (strcmp(sc->d.buf, "gid") == 0 || | |
801 | strcmp(sc->d.buf, "group") == 0) { | |
802 | token(sc); | |
803 | if (sc->t == '=') | |
804 | token(sc); | |
805 | if (sc->t != CTOK_WORD) | |
806 | error(sc, "parse error, expected group name or gid"); | |
807 | if (isdigit((unsigned char)*sc->d.buf)) | |
808 | xo->gid = atoi(sc->d.buf); | |
809 | else { | |
810 | struct group *gr = getgrnam(sc->d.buf); | |
811 | if (!gr) | |
812 | error(sc, "unknown user name `%s'", sc->d.buf); | |
813 | xo->gid = gr->gr_gid; | |
814 | } | |
815 | token(sc); | |
816 | CONF_ACCEPT; | |
817 | } | |
818 | ||
819 | /* --- Now try resource limit settings --- */ | |
820 | ||
71db0fbd | 821 | #ifdef HAVE_SETRLIMIT |
48bb1f76 | 822 | if (rlimit_option(&xo->xl, sc)) |
823 | CONF_ACCEPT; | |
71db0fbd | 824 | #endif |
48bb1f76 | 825 | |
826 | /* --- And then environment settings --- */ | |
827 | ||
828 | if (xenv_option(xo, sc)) | |
829 | CONF_ACCEPT; | |
830 | ||
831 | /* --- Nothing found --- */ | |
832 | ||
833 | CONF_END; | |
834 | } | |
835 | ||
836 | /* --- @exec_desc@ --- */ | |
837 | ||
838 | static void exec_desc(xdata *x, dstr *d) | |
839 | { | |
840 | char **p; | |
841 | char sep = '['; | |
842 | dstr_puts(d, "exec "); | |
843 | if (strcmp(x->xa->file, x->xa->argv[0]) != 0) { | |
844 | dstr_puts(d, x->xa->file); | |
845 | dstr_putc(d, ' '); | |
846 | } | |
847 | for (p = x->xa->argv; *p; p++) { | |
848 | dstr_putc(d, sep); | |
849 | dstr_puts(d, *p); | |
850 | sep = ' '; | |
851 | } | |
852 | dstr_putc(d, ']'); | |
853 | dstr_putz(d); | |
854 | } | |
855 | ||
856 | /* --- @exec_read@ --- */ | |
857 | ||
858 | static void exec_read(xdata *x, scanner *sc) | |
859 | { | |
860 | size_t base = 0; | |
861 | dstr d = DSTR_INIT; | |
862 | xargs *xa; | |
863 | ||
864 | /* --- Read the first word --- * | |
865 | * | |
866 | * This is either a shell command or the actual program to run. | |
867 | */ | |
868 | ||
869 | if (sc->t == CTOK_WORD) { | |
870 | dstr_putd(&d, &sc->d); d.len++; | |
871 | base = d.len; | |
872 | token(sc); | |
873 | } | |
874 | ||
875 | /* --- See if there's a list of arguments --- * | |
876 | * | |
877 | * If not, then the thing I saw was a shell command, so build the proper | |
878 | * arguments for that. | |
879 | */ | |
880 | ||
881 | if (sc->t != '[') { | |
882 | char *p; | |
883 | if (!base) | |
884 | error(sc, "parse error, expected shell command or argument list"); | |
885 | xa = xmalloc(XARGS_SZ(3) + 8 + 3 + d.len); | |
886 | p = (char *)(xa->argv + 4); | |
887 | xa->ref = 1; | |
888 | xa->file = p; | |
889 | xa->argv[0] = p; memcpy(p, "/bin/sh", 8); p += 8; | |
890 | xa->argv[1] = p; memcpy(p, "-c", 3); p += 3; | |
891 | xa->argv[2] = p; memcpy(p, d.buf, d.len); p += d.len; | |
892 | xa->argv[3] = 0; | |
893 | } | |
894 | ||
895 | /* --- Snarf in a list of arguments --- */ | |
896 | ||
897 | else { | |
898 | int argc = 0; | |
899 | char *p, *q; | |
900 | char **v; | |
901 | ||
71db0fbd | 902 | /* --- Strip off the leading `[' --- * |
903 | * | |
904 | * Allow various handy filename characters to be entered without quoting. | |
905 | */ | |
48bb1f76 | 906 | |
71db0fbd | 907 | conf_undelim(sc, "=:/.", "=:/."); |
48bb1f76 | 908 | token(sc); |
909 | ||
910 | /* --- Read a sequence of arguments --- */ | |
911 | ||
912 | while (sc->t == CTOK_WORD) { | |
913 | dstr_putd(&d, &sc->d); d.len++; | |
914 | token(sc); | |
915 | argc++; | |
916 | } | |
71db0fbd | 917 | conf_undelim(sc, 0, 0); |
48bb1f76 | 918 | |
919 | /* --- Expect the closing `]' --- */ | |
920 | ||
921 | if (sc->t != ']') | |
922 | error(sc, "parse error, missing `]'"); | |
923 | token(sc); | |
924 | ||
925 | /* --- If there are no arguments, whinge --- */ | |
926 | ||
927 | if (!argc) | |
928 | error(sc, "must specify at least one argument"); | |
929 | ||
930 | /* --- Allocate a lump of memory for the array --- */ | |
931 | ||
932 | xa = xmalloc(XARGS_SZ(argc) + d.len); | |
933 | xa->ref = 1; | |
934 | v = xa->argv; | |
935 | p = (char *)(v + argc + 1); | |
936 | memcpy(p, d.buf, d.len); | |
937 | q = p + d.len; | |
938 | xa->file = p; | |
939 | p += base; | |
940 | ||
941 | /* --- Start dumping addresses into the @argv@ array --- */ | |
942 | ||
943 | for (;;) { | |
944 | *v++ = p; | |
945 | while (*p++ && p < q) | |
946 | ; | |
947 | if (p >= q) | |
948 | break; | |
949 | } | |
950 | *v++ = 0; | |
951 | } | |
952 | ||
953 | /* --- Do some other setting up --- */ | |
954 | ||
955 | dstr_destroy(&d); | |
956 | x->xa = xa; | |
957 | x->xo = CREATE(xopts); | |
958 | *x->xo = exec_opts; | |
959 | x->xo->ref = 1; | |
960 | return; | |
961 | } | |
962 | ||
963 | /* --- @exec_endpt@ --- */ | |
964 | ||
965 | static endpt *exec_endpt(xdata *x, const char *desc) | |
966 | { | |
967 | xept *xe = CREATE(xept); | |
968 | xe->e.ops = &xept_ops; | |
969 | xe->e.other = 0; | |
970 | xe->e.t = 0; | |
971 | xe->e.f = 0; | |
972 | xe->xa = x->xa; xe->xa->ref++; | |
973 | xe->xo = x->xo; xe->xo->ref++; | |
974 | xe->kid = -1; | |
28d2517c | 975 | xe->f = 0; |
372a98e2 | 976 | xe->desc = xstrdup(desc); |
48bb1f76 | 977 | return (&xe->e); |
978 | } | |
979 | ||
980 | /* --- @exec_destroy@ --- */ | |
981 | ||
982 | static void exec_destroy(xdata *x) | |
983 | { | |
984 | x_tidy(x->xa, x->xo); | |
985 | } | |
986 | ||
987 | /*----- Source definition -------------------------------------------------*/ | |
988 | ||
989 | /* --- @option@ --- */ | |
990 | ||
991 | static int xsource_option(source *s, scanner *sc) | |
992 | { | |
993 | xsource *xs = (xsource *)s; | |
994 | return (exec_option(xs ? &xs->x : 0, sc)); | |
995 | } | |
996 | ||
997 | /* --- @read@ --- */ | |
998 | ||
999 | static source *xsource_read(scanner *sc) | |
1000 | { | |
1001 | xsource *xs; | |
1002 | ||
1003 | if (!conf_prefix(sc, "exec")) | |
1004 | return (0); | |
1005 | xs = CREATE(xsource); | |
1006 | xs->s.ops = &xsource_ops; | |
1007 | xs->s.desc = 0; | |
1008 | exec_read(&xs->x, sc); | |
1009 | return (&xs->s); | |
1010 | } | |
1011 | ||
1012 | /* --- @attach@ --- */ | |
1013 | ||
1014 | static void xsource_destroy(source */*s*/); | |
1015 | ||
1016 | static void xsource_attach(source *s, scanner *sc, target *t) | |
1017 | { | |
1018 | xsource *xs = (xsource *)s; | |
1019 | endpt *e, *ee; | |
1020 | ||
1021 | /* --- Set up the source description string --- */ | |
1022 | ||
1023 | { | |
1024 | dstr d = DSTR_INIT; | |
1025 | exec_desc(&xs->x, &d); | |
1026 | dstr_puts(&d, " -> "); | |
1027 | dstr_puts(&d, t->desc); | |
1028 | xs->s.desc = xstrdup(d.buf); | |
1029 | dstr_destroy(&d); | |
1030 | } | |
1031 | ||
1032 | /* --- Create the endpoints --- */ | |
1033 | ||
1034 | if ((ee = t->ops->create(t, xs->s.desc)) == 0) | |
1035 | goto tidy; | |
1036 | if ((e = exec_endpt(&xs->x, xs->s.desc)) == 0) { | |
1037 | ee->ops->close(ee); | |
1038 | goto tidy; | |
1039 | } | |
86c9bc4b | 1040 | endpt_join(e, ee, xs->s.desc); |
48bb1f76 | 1041 | |
1042 | /* --- Dispose of source and target --- */ | |
1043 | ||
1044 | tidy: | |
1045 | t->ops->destroy(t); | |
1046 | xsource_destroy(&xs->s); | |
1047 | } | |
1048 | ||
1049 | /* --- @destroy@ --- */ | |
1050 | ||
1051 | static void xsource_destroy(source *s) | |
1052 | { | |
1053 | xsource *xs = (xsource *)s; | |
b0805b27 | 1054 | xfree(xs->s.desc); |
48bb1f76 | 1055 | exec_destroy(&xs->x); |
1056 | DESTROY(xs); | |
1057 | } | |
1058 | ||
1059 | /* --- Executable source operations --- */ | |
1060 | ||
1061 | source_ops xsource_ops = { | |
1062 | "exec", | |
1063 | xsource_option, xsource_read, xsource_attach, xsource_destroy | |
1064 | }; | |
1065 | ||
1066 | /*----- Exec target description -------------------------------------------*/ | |
1067 | ||
1068 | /* --- @option@ --- */ | |
1069 | ||
1070 | static int xtarget_option(target *t, scanner *sc) | |
1071 | { | |
1072 | xtarget *xt = (xtarget *)t; | |
1073 | return (exec_option(xt ? &xt->x : 0, sc)); | |
1074 | } | |
1075 | ||
1076 | /* --- @read@ --- */ | |
1077 | ||
1078 | static target *xtarget_read(scanner *sc) | |
1079 | { | |
1080 | xtarget *xt; | |
1081 | dstr d = DSTR_INIT; | |
1082 | ||
1083 | if (!conf_prefix(sc, "exec")) | |
1084 | return (0); | |
1085 | xt = CREATE(xtarget); | |
1086 | xt->t.ops = &xtarget_ops; | |
1087 | exec_read(&xt->x, sc); | |
1088 | exec_desc(&xt->x, &d); | |
1089 | xt->t.desc = xstrdup(d.buf); | |
1090 | dstr_destroy(&d); | |
1091 | return (&xt->t); | |
1092 | } | |
1093 | ||
1094 | /* --- @create@ --- */ | |
1095 | ||
1096 | static endpt *xtarget_create(target *t, const char *desc) | |
1097 | { | |
1098 | xtarget *xt = (xtarget *)t; | |
1099 | endpt *e = exec_endpt(&xt->x, desc); | |
1100 | return (e); | |
1101 | } | |
1102 | ||
1103 | /* --- @destroy@ --- */ | |
1104 | ||
1105 | static void xtarget_destroy(target *t) | |
1106 | { | |
1107 | xtarget *xt = (xtarget *)t; | |
b0805b27 | 1108 | xfree(xt->t.desc); |
48bb1f76 | 1109 | exec_destroy(&xt->x); |
1110 | DESTROY(xt); | |
1111 | } | |
1112 | ||
1113 | /* --- Exec target operations --- */ | |
1114 | ||
1115 | target_ops xtarget_ops = { | |
1116 | "exec", | |
ee599f55 | 1117 | xtarget_option, xtarget_read, 0, xtarget_create, xtarget_destroy |
48bb1f76 | 1118 | }; |
1119 | ||
1120 | /*----- That's all, folks -------------------------------------------------*/ |