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1 | /* -*-c-*- |
2 | * |
b69a615b |
3 | * $Id$ |
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4 | * |
5 | * Port forwarding thingy |
6 | * |
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7 | * (c) 1999 Straylight/Edgeware |
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8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the `fw' port forwarder. |
13 | * |
14 | * `fw' 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 | * `fw' 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 `fw'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
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29 | /*----- Header files ------------------------------------------------------*/ |
30 | |
31 | #include "config.h" |
32 | |
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33 | #include <assert.h> |
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34 | #include <ctype.h> |
35 | #include <errno.h> |
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36 | #include <signal.h> |
37 | #include <stdarg.h> |
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38 | #include <stdio.h> |
39 | #include <stdlib.h> |
40 | #include <string.h> |
61e3dbdf |
41 | #include <time.h> |
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42 | |
43 | #include <unistd.h> |
44 | #include <syslog.h> |
45 | |
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46 | #include <grp.h> |
47 | #include <pwd.h> |
48 | |
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49 | #include <mLib/bres.h> |
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50 | #include <mLib/dstr.h> |
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51 | #include <mLib/mdwopt.h> |
52 | #include <mLib/quis.h> |
53 | #include <mLib/report.h> |
54 | #include <mLib/sel.h> |
61e3dbdf |
55 | #include <mLib/sig.h> |
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56 | #include <mLib/sub.h> |
57 | |
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58 | #include "conf.h" |
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59 | #include "endpt.h" |
60 | #include "exec.h" |
61 | #include "fattr.h" |
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62 | #include "file.h" |
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63 | #include "fw.h" |
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64 | #include "privconn.h" |
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65 | #include "scan.h" |
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66 | #include "socket.h" |
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67 | #include "source.h" |
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68 | |
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69 | /*----- Global variables --------------------------------------------------*/ |
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70 | |
71 | sel_state *sel; /* Multiplexor for nonblocking I/O */ |
61e3dbdf |
72 | |
73 | /*----- Static variables --------------------------------------------------*/ |
74 | |
372a98e2 |
75 | typedef struct conffile { |
76 | struct conffile *next; |
77 | char *name; |
78 | } conffile; |
79 | |
61e3dbdf |
80 | static unsigned flags = 0; /* Global state flags */ |
81 | static unsigned active = 0; /* Number of active things */ |
372a98e2 |
82 | static conffile *conffiles = 0; /* List of configuration files */ |
61e3dbdf |
83 | |
84 | #define FW_SYSLOG 1u |
85 | #define FW_QUIET 2u |
86 | #define FW_SET 4u |
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87 | |
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88 | /*----- Configuration parsing ---------------------------------------------*/ |
89 | |
90 | /* --- @parse@ --- * |
91 | * |
92 | * Arguments: @scanner *sc@ = pointer to scanner definition |
93 | * |
94 | * Returns: --- |
95 | * |
96 | * Use: Parses a configuration file from the scanner. |
97 | */ |
98 | |
99 | static source_ops *sources[] = |
100 | { &xsource_ops, &fsource_ops, &ssource_ops, 0 }; |
101 | static target_ops *targets[] = |
102 | { &xtarget_ops, &ftarget_ops, &starget_ops, 0 }; |
103 | |
104 | void parse(scanner *sc) |
105 | { |
106 | token(sc); |
107 | |
108 | for (;;) { |
109 | if (sc->t == CTOK_EOF) |
110 | break; |
111 | if (sc->t != CTOK_WORD) |
112 | error(sc, "parse error, keyword expected"); |
113 | |
114 | /* --- Handle a forwarding request --- */ |
115 | |
116 | if (strcmp(sc->d.buf, "forward") == 0 || |
117 | strcmp(sc->d.buf, "fw") == 0 || |
118 | strcmp(sc->d.buf, "from") == 0) { |
119 | source *s; |
120 | target *t; |
121 | |
122 | token(sc); |
123 | |
124 | /* --- Read a source description --- */ |
125 | |
126 | { |
127 | source_ops **sops; |
128 | |
129 | /* --- Try to find a source type which understands --- */ |
130 | |
131 | s = 0; |
132 | for (sops = sources; *sops; sops++) { |
133 | if ((s = (*sops)->read(sc)) != 0) |
134 | goto found_source; |
135 | } |
136 | error(sc, "unknown source name `%s'", sc->d.buf); |
137 | |
138 | /* --- Read any source-specific options --- */ |
139 | |
140 | found_source: |
141 | if (sc->t == '{') { |
142 | token(sc); |
143 | while (sc->t == CTOK_WORD) { |
144 | if (!s->ops->option || !s->ops->option(s, sc)) { |
145 | error(sc, "unknown %s source option `%s'", |
146 | s->ops->name, sc->d.buf); |
147 | } |
148 | if (sc->t == ';') |
149 | token(sc); |
150 | } |
151 | if (sc->t != '}') |
152 | error(sc, "parse error, missing `}'"); |
153 | token(sc); |
154 | } |
155 | } |
156 | |
157 | /* --- Read a destination description --- */ |
158 | |
159 | if (sc->t == CTOK_WORD && (strcmp(sc->d.buf, "to") == 0 || |
160 | strcmp(sc->d.buf, "->") == 0)) |
161 | token(sc); |
162 | |
163 | { |
164 | target_ops **tops; |
165 | |
166 | /* --- Try to find a target which understands --- */ |
167 | |
168 | t = 0; |
169 | for (tops = targets; *tops; tops++) { |
170 | if ((t = (*tops)->read(sc)) != 0) |
171 | goto found_target; |
172 | } |
173 | error(sc, "unknown target name `%s'", sc->d.buf); |
174 | |
175 | /* --- Read any target-specific options --- */ |
176 | |
177 | found_target: |
178 | if (sc->t == '{') { |
179 | token(sc); |
180 | while (sc->t == CTOK_WORD) { |
181 | if (!t->ops->option || !t->ops->option(t, sc)) { |
182 | error(sc, "unknown %s target option `%s'", |
183 | t->ops->name, sc->d.buf); |
184 | } |
185 | if (sc->t == ';') |
186 | token(sc); |
187 | } |
188 | if (sc->t != '}') |
189 | error(sc, "parse error, `}' expected"); |
190 | token(sc); |
191 | } |
192 | } |
193 | |
194 | /* --- Combine the source and target --- */ |
195 | |
196 | s->ops->attach(s, sc, t); |
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197 | if (t->ops->confirm) |
198 | t->ops->confirm(t); |
8c0a939e |
199 | } |
200 | |
201 | /* --- Include configuration from a file --- * |
202 | * |
203 | * Slightly tricky. Scan the optional semicolon from the including |
204 | * stream, not the included one. |
205 | */ |
206 | |
207 | else if (strcmp(sc->d.buf, "include") == 0) { |
208 | FILE *fp; |
209 | dstr d = DSTR_INIT; |
210 | |
211 | token(sc); |
212 | conf_name(sc, '/', &d); |
213 | if ((fp = fopen(d.buf, "r")) == 0) |
214 | error(sc, "can't include `%s': %s", d.buf, strerror(errno)); |
215 | if (sc->t == ';') |
216 | token(sc); |
217 | pushback(sc); |
218 | scan_push(sc, scan_file(fp, d.buf, 0)); |
219 | token(sc); |
220 | dstr_destroy(&d); |
221 | continue; /* Don't parse a trailing `;' */ |
222 | } |
223 | |
224 | /* --- Other configuration is handled elsewhere --- */ |
225 | |
226 | else { |
227 | |
228 | /* --- First try among the sources --- */ |
229 | |
230 | { |
231 | source_ops **sops; |
232 | |
233 | for (sops = sources; *sops; sops++) { |
234 | if ((*sops)->option && (*sops)->option(0, sc)) |
235 | goto found_option; |
236 | } |
237 | } |
238 | |
239 | /* --- Then try among the targets --- */ |
240 | |
241 | { |
242 | target_ops **tops; |
243 | |
244 | for (tops = targets; *tops; tops++) { |
245 | if ((*tops)->option && (*tops)->option(0, sc)) |
246 | goto found_option; |
247 | } |
248 | } |
249 | |
250 | /* --- Nobody wants the option --- */ |
251 | |
252 | error(sc, "unknown global option or prefix `%s'", sc->d.buf); |
253 | |
254 | found_option:; |
255 | } |
256 | |
257 | if (sc->t == ';') |
258 | token(sc); |
259 | } |
260 | } |
261 | |
262 | /*----- General utility functions -----------------------------------------*/ |
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263 | |
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264 | /* --- @fw_log@ --- * |
265 | * |
266 | * Arguments: @time_t t@ = when the connection occurred or (@-1@) |
267 | * @const char *fmt@ = format string to fill in |
268 | * @...@ = other arguments |
269 | * |
270 | * Returns: --- |
271 | * |
272 | * Use: Logs a connection. |
273 | */ |
274 | |
275 | void fw_log(time_t t, const char *fmt, ...) |
276 | { |
277 | struct tm *tm; |
278 | dstr d = DSTR_INIT; |
279 | va_list ap; |
280 | |
281 | if (flags & FW_QUIET) |
282 | return; |
283 | |
284 | if (t == -1) |
285 | t = time(0); |
286 | tm = localtime(&t); |
287 | DENSURE(&d, 64); |
17be1d6b |
288 | d.len += strftime(d.buf, d.sz, "%Y-%m-%d %H:%M:%S ", tm); |
61e3dbdf |
289 | va_start(ap, fmt); |
2f8a65a1 |
290 | dstr_vputf(&d, fmt, &ap); |
61e3dbdf |
291 | va_end(ap); |
292 | if (flags & FW_SYSLOG) |
293 | syslog(LOG_NOTICE, "%s", d.buf); |
294 | else { |
295 | DPUTC(&d, '\n'); |
296 | dstr_write(&d, stderr); |
297 | } |
298 | DDESTROY(&d); |
299 | } |
300 | |
301 | /* --- @fw_inc@, @fw_dec@ --- * |
302 | * |
303 | * Arguments: --- |
304 | * |
305 | * Returns: --- |
306 | * |
307 | * Use: Increments or decrements the active thing count. `fw' won't |
308 | * quit while there are active things. |
309 | */ |
310 | |
311 | void fw_inc(void) { flags |= FW_SET; active++; } |
312 | void fw_dec(void) { if (active) active--; } |
313 | |
314 | /* --- @fw_exit@ --- * |
315 | * |
316 | * Arguments: --- |
317 | * |
318 | * Returns: --- |
319 | * |
320 | * Use: Exits when appropriate. |
321 | */ |
322 | |
323 | static void fw_exit(void) |
324 | { |
325 | endpt_killall(); |
326 | source_killall(); |
327 | } |
328 | |
329 | /* --- @fw_tidy@ --- * |
330 | * |
331 | * Arguments: @int n@ = signal number |
332 | * @void *p@ = an uninteresting argument |
333 | * |
334 | * Returns: --- |
335 | * |
336 | * Use: Handles various signals and causes a clean tidy-up. |
337 | */ |
338 | |
339 | static void fw_tidy(int n, void *p) |
340 | { |
372a98e2 |
341 | const char *sn = 0; |
342 | switch (n) { |
343 | case SIGTERM: sn = "SIGTERM"; break; |
344 | case SIGINT: sn = "SIGINT"; break; |
345 | default: abort(); |
346 | } |
347 | |
348 | fw_log(-1, "closing down gracefully on %s", sn); |
349 | source_killall(); |
350 | } |
351 | |
352 | /* --- @fw_die@ --- * |
353 | * |
354 | * Arguments: @int n@ = signal number |
355 | * @void *p@ = an uninteresting argument |
356 | * |
357 | * Returns: --- |
358 | * |
359 | * Use: Handles various signals and causes an abrupt shutdown. |
360 | */ |
361 | |
362 | static void fw_die(int n, void *p) |
363 | { |
364 | const char *sn = 0; |
365 | switch (n) { |
366 | case SIGQUIT: sn = "SIGQUIT"; break; |
367 | default: abort(); |
368 | } |
369 | |
370 | fw_log(-1, "closing down abruptly on %s", sn); |
371 | source_killall(); |
372 | endpt_killall(); |
373 | } |
374 | |
375 | /* --- @fw_reload@ --- * |
376 | * |
377 | * Arguments: @int n@ = a signal number |
378 | * @void *p@ = an uninteresting argument |
379 | * |
380 | * Returns: --- |
381 | * |
382 | * Use: Handles a hangup signal by re-reading configuration files. |
383 | */ |
384 | |
385 | static void fw_reload(int n, void *p) |
386 | { |
387 | FILE *fp; |
388 | scanner sc; |
389 | conffile *cf; |
390 | |
391 | assert(n == SIGHUP); |
392 | if (!conffiles) { |
393 | fw_log(-1, "no configuration files to reload: ignoring SIGHUP"); |
394 | return; |
395 | } |
396 | fw_log(-1, "reloading configuration files..."); |
397 | source_killall(); |
398 | scan_create(&sc); |
399 | for (cf = conffiles; cf; cf = cf->next) { |
400 | if ((fp = fopen(cf->name, "r")) == 0) |
401 | fw_log(-1, "error loading `%s': %s", cf->name, strerror(errno)); |
402 | else |
403 | scan_add(&sc, scan_file(fp, cf->name, 0)); |
404 | } |
8c0a939e |
405 | parse(&sc); |
372a98e2 |
406 | fw_log(-1, "... reload completed OK"); |
61e3dbdf |
407 | } |
408 | |
8c0a939e |
409 | /*----- Startup and options parsing ---------------------------------------*/ |
410 | |
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411 | /* --- Standard GNU help options --- */ |
412 | |
413 | static void version(FILE *fp) |
414 | { |
2d9ec601 |
415 | pquis(fp, "$ version " VERSION "\n"); |
e82f7154 |
416 | } |
417 | |
418 | static void usage(FILE *fp) |
419 | { |
17be1d6b |
420 | pquis(fp, "Usage: $ [-dql] [-f file] [config statements...]\n"); |
e82f7154 |
421 | } |
422 | |
423 | static void help(FILE *fp) |
424 | { |
425 | version(fp); |
426 | fputc('\n', fp); |
427 | usage(fp); |
2d9ec601 |
428 | pquis(fp, "\n\ |
61e3dbdf |
429 | An excessively full-featured port-forwarder, which subsumes large chunks\n\ |
430 | of the functionality of inetd, netcat, and normal cat. Options available\n\ |
431 | are:\n\ |
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432 | \n\ |
17be1d6b |
433 | -h, --help Display this help message.\n\ |
434 | -v, --version Display the program's version number.\n\ |
435 | -u, --usage Display a terse usage summary.\n\ |
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436 | \n\ |
fc170a33 |
437 | -G, --grammar Show a summary of the configuration language.\n\ |
438 | -O, --options Show a summary of the source and target options.\n\ |
2d9ec601 |
439 | \n\ |
17be1d6b |
440 | -f, --file=FILE Read configuration from a file.\n\ |
441 | -q, --quiet Don't emit any logging information.\n\ |
442 | -d, --daemon Fork into background after initializing.\n\ |
443 | -l, --syslog Send log output to the system logger.\n\ |
fc170a33 |
444 | -s, --setuid=USER Change uid to USER after initializing sources.\n\ |
445 | -g, --setgid=GRP Change gid to GRP after initializing sources.\n\ |
e82f7154 |
446 | \n\ |
447 | Configuration may be supplied in one or more configuration files, or on\n\ |
448 | the command line (or both). If no `-f' option is present, and no\n\ |
449 | configuration is given on the command line, the standard input stream is\n\ |
450 | read.\n\ |
451 | \n\ |
452 | Configuration is free-form. Comments begin with a `#' character and\n\ |
afd7451e |
453 | continue to the end of the line. Each command line argument is considered\n\ |
61e3dbdf |
454 | to be a separate line.\n\ |
afd7451e |
455 | \n\ |
2d9ec601 |
456 | The grammar is fairly complicated. For a summary, run `$ --grammar'.\n\ |
457 | For a summary of the various options, run `$ --options'.\n\ |
458 | "); |
459 | } |
460 | |
461 | /* --- Other helpful options --- */ |
462 | |
463 | static void grammar(FILE *fp) |
464 | { |
465 | version(fp); |
466 | pquis(fp, "\n\ |
467 | Grammar summary\n\ |
468 | \n\ |
469 | Basic syntax\n\ |
1c2054c7 |
470 | FILE ::= EMPTY | FILE STMT [`;']\n\ |
471 | STMT ::= OPTION-STMT | FW-STMT\n\ |
472 | FW-STMT ::= `fw' SOURCE OPTIONS [`to'|`->'] TARGET OPTIONS\n\ |
473 | OPTIONS ::= `{' OPTION-SEQ `}'\n\ |
474 | OPTION-SEQ ::= EMPTY | OPTION-STMT [`;'] OPTION-SEQ\n\ |
2d9ec601 |
475 | \n\ |
476 | Option syntax\n\ |
1c2054c7 |
477 | OPTION-STMT ::= Q-OPTION\n\ |
478 | Q-OPTION ::= OPTION\n\ |
479 | | PREFIX `.' Q-OPTION\n\ |
480 | | PREFIX `{' OPTION-SEQ `}'\n\ |
481 | PREFIX ::= WORD\n\ |
2d9ec601 |
482 | \n\ |
483 | File source and target\n\ |
1c2054c7 |
484 | SOURCE ::= FILE\n\ |
485 | TARGET ::= FILE\n\ |
486 | FILE ::= `file' [`.'] FSPEC [`,' FSPEC]\n\ |
487 | FSPEC ::= FD-SPEC | NAME-SPEC | NULL-SPEC\n\ |
488 | FD-SPEC ::= [[`:']`fd'[`:']] NUMBER|`stdin'|`stdout'\n\ |
b69a615b |
489 | NAME-SPEC ::= [[`:']`name'[`:']] FILE-NAME\n\ |
1c2054c7 |
490 | FILE-NAME ::= PATH-SEQ | [ PATH-SEQ ]\n\ |
491 | PATH-SEQ ::= PATH-ELT | PATH-SEQ PATH-ELT\n\ |
492 | PATH-ELT ::= `/' | WORD\n\ |
493 | NULL-SPEC ::= [`:']`null'[`:']\n\ |
2d9ec601 |
494 | \n\ |
495 | Exec source and target\n\ |
1c2054c7 |
496 | SOURCE ::= EXEC\n\ |
497 | TARGET ::= EXEC\n\ |
498 | EXEC ::= `exec' [`.'] CMD-SPEC\n\ |
499 | CMD-SPEC ::= SHELL-CMD | [PROG-NAME] `[' ARGV0 ARG-SEQ `]'\n\ |
500 | ARG-SEQ ::= WORD | ARG-SEQ WORD\n\ |
501 | SHELL-CMD ::= WORD\n\ |
502 | ARGV0 ::= WORD\n\ |
2d9ec601 |
503 | \n\ |
504 | Socket source and target\n\ |
1c2054c7 |
505 | SOURCE ::= SOCKET-SOURCE\n\ |
506 | TARGET ::= SOCKET-TARGET\n\ |
507 | SOCKET-SOURCE ::= [`socket'[`.']] [[`:']ADDR-TYPE[`:']] SOURCE-ADDR\n\ |
508 | SOCKET-TARGET ::= [`socket'[`.']] [[`:']ADDR-TYPE[`:']] TARGET-ADDR\n\ |
2d9ec601 |
509 | \n\ |
1c2054c7 |
510 | INET-SOURCE-ADDR ::= [`port'] PORT\n\ |
511 | INET-TARGET-ADDR ::= ADDRESS [`:'] PORT\n\ |
512 | ADDRESS ::= ADDR-ELT | ADDRESS ADDR-ELT\n\ |
513 | ADDR-ELT ::= `.' | WORD\n\ |
2d9ec601 |
514 | \n\ |
1c2054c7 |
515 | UNIX-SOURCE-ADDR ::= FILE-NAME\n\ |
516 | UNIX-TARGET-ADDR ::= FILE-NAME\n\ |
2d9ec601 |
517 | "); |
518 | } |
519 | |
520 | static void options(FILE *fp) |
521 | { |
522 | version(fp); |
523 | pquis(fp, "\n\ |
524 | Options summary\n\ |
525 | \n\ |
526 | File attributes (`fattr')\n\ |
1c2054c7 |
527 | prefix.FATTR.MODE [=] MODE\n\ |
528 | prefix.FATTR.OWNER [=] USER\n\ |
529 | prefix.FATTR.GROUP [=] GROUP\n\ |
2d9ec601 |
530 | \n\ |
531 | File options\n\ |
532 | file.create [=] yes|no\n\ |
533 | file.open [=] no|truncate|append\n\ |
534 | file.fattr.*\n\ |
535 | \n\ |
536 | Exec options\n\ |
537 | exec.logging [=] yes|no\n\ |
1c2054c7 |
538 | exec.dir [=] FILE-NAME\n\ |
539 | exec.root [=] FILE-NAME\n\ |
540 | exec.user [=] USER\n\ |
541 | exec.group [=] GROUP\n\ |
542 | exec.rlimit.LIMIT[.hard|.soft] [=] VALUE\n\ |
2d9ec601 |
543 | exec.env.clear\n\ |
1c2054c7 |
544 | exec.env.unset VAR\n\ |
545 | exec.env.[set] VAR [=] VALUE\n\ |
2d9ec601 |
546 | \n\ |
547 | Socket options\n\ |
1c2054c7 |
548 | socket.conn [=] NUMBER|unlimited|one-shot\n\ |
549 | socket.listen [=] NUMBER\n\ |
2d9ec601 |
550 | socket.logging [=] yes|no\n\ |
8c0a939e |
551 | \n\ |
1c2054c7 |
552 | socket.inet.source.[allow|deny] [host] ADDR [/ ADDR]\n\ |
553 | socket.inet.source.[allow|deny] priv-port\n\ |
554 | socket.inet.source.addr [=] any|ADDR\n\ |
555 | socket.inet.dest.addr [=] any|ADDR\n\ |
ee599f55 |
556 | socket.inet.dest.priv-port [=] yes|no\n\ |
8c0a939e |
557 | \n\ |
2d9ec601 |
558 | socket.unix.fattr.*\n\ |
559 | "); |
e82f7154 |
560 | } |
561 | |
562 | /* --- @main@ --- * |
563 | * |
564 | * Arguments: @int argc@ = number of command line arguments |
565 | * @char *argv[]@ = vector of argument strings |
566 | * |
567 | * Returns: --- |
568 | * |
569 | * Use: Simple port-forwarding server. |
570 | */ |
571 | |
572 | int main(int argc, char *argv[]) |
573 | { |
574 | unsigned f = 0; |
575 | sel_state sst; |
372a98e2 |
576 | sig s_term, s_quit, s_int, s_hup; |
61e3dbdf |
577 | scanner sc; |
fc170a33 |
578 | uid_t drop = -1; |
579 | gid_t dropg = -1; |
372a98e2 |
580 | conffile *cf, **cff = &conffiles; |
e82f7154 |
581 | |
372a98e2 |
582 | #define f_bogus 1u |
a8b9c5eb |
583 | #define f_file 2u |
584 | #define f_syslog 4u |
585 | #define f_fork 8u |
e82f7154 |
586 | |
587 | /* --- Initialize things --- */ |
588 | |
589 | ego(argv[0]); |
590 | sel = &sst; |
591 | sel_init(sel); |
592 | sub_init(); |
61e3dbdf |
593 | sig_init(sel); |
e82f7154 |
594 | bres_init(sel); |
2d9ec601 |
595 | bres_exec(0); |
61e3dbdf |
596 | exec_init(); |
597 | fattr_init(&fattr_global); |
598 | scan_create(&sc); |
599 | |
61e3dbdf |
600 | atexit(fw_exit); |
e82f7154 |
601 | |
602 | /* --- Parse command line options --- */ |
603 | |
604 | for (;;) { |
605 | static struct option opts[] = { |
606 | |
607 | /* --- Standard GNU help options --- */ |
608 | |
609 | { "help", 0, 0, 'h' }, |
610 | { "version", 0, 0, 'v' }, |
611 | { "usage", 0, 0, 'u' }, |
612 | |
2d9ec601 |
613 | /* --- Other help options --- */ |
614 | |
1e8a64e8 |
615 | { "grammar", 0, 0, 'G' }, |
616 | { "options", 0, 0, 'O' }, |
2d9ec601 |
617 | |
e82f7154 |
618 | /* --- Other useful arguments --- */ |
619 | |
620 | { "file", OPTF_ARGREQ, 0, 'f' }, |
61e3dbdf |
621 | { "fork", 0, 0, 'd' }, |
622 | { "daemon", 0, 0, 'd' }, |
17be1d6b |
623 | { "syslog", 0, 0, 'l' }, |
624 | { "log", 0, 0, 'l' }, |
61e3dbdf |
625 | { "quiet", 0, 0, 'q' }, |
fc170a33 |
626 | { "setuid", OPTF_ARGREQ, 0, 's' }, |
627 | { "uid", OPTF_ARGREQ, 0, 's' }, |
628 | { "setgid", OPTF_ARGREQ, 0, 'g' }, |
629 | { "gid", OPTF_ARGREQ, 0, 'g' }, |
e82f7154 |
630 | |
631 | /* --- Magic terminator --- */ |
632 | |
633 | { 0, 0, 0, 0 } |
634 | }; |
fc170a33 |
635 | int i = mdwopt(argc, argv, "+hvu GO f:dls:g:", opts, 0, 0, 0); |
e82f7154 |
636 | |
637 | if (i < 0) |
638 | break; |
639 | switch (i) { |
640 | case 'h': |
641 | help(stdout); |
642 | exit(0); |
643 | break; |
644 | case 'v': |
645 | version(stdout); |
646 | exit(0); |
647 | break; |
648 | case 'u': |
649 | usage(stdout); |
650 | exit(0); |
651 | break; |
fc170a33 |
652 | case 'G': |
2d9ec601 |
653 | grammar(stdout); |
654 | exit(0); |
655 | break; |
fc170a33 |
656 | case 'O': |
2d9ec601 |
657 | options(stdout); |
658 | exit(0); |
659 | break; |
61e3dbdf |
660 | case 'f': |
661 | if (strcmp(optarg, "-") == 0) |
662 | scan_add(&sc, scan_file(stdin, "<stdin>", SCF_NOCLOSE)); |
663 | else { |
664 | FILE *fp; |
665 | if ((fp = fopen(optarg, "r")) == 0) |
666 | die(1, "couldn't open file `%s': %s", optarg, strerror(errno)); |
372a98e2 |
667 | cf = CREATE(conffile); |
668 | cf->name = optarg; |
669 | *cff = cf; |
670 | cff = &cf->next; |
61e3dbdf |
671 | scan_add(&sc, scan_file(fp, optarg, 0)); |
672 | } |
e82f7154 |
673 | f |= f_file; |
e82f7154 |
674 | break; |
61e3dbdf |
675 | case 'd': |
e82f7154 |
676 | f |= f_fork; |
677 | break; |
17be1d6b |
678 | case 'l': |
679 | f |= f_syslog; |
680 | break; |
61e3dbdf |
681 | case 'q': |
682 | flags |= FW_QUIET; |
683 | break; |
fc170a33 |
684 | case 's': |
685 | if (isdigit((unsigned char )optarg[0])) { |
686 | char *q; |
687 | drop = strtol(optarg, &q, 0); |
688 | if (*q) |
689 | die(1, "bad uid `%s'", optarg); |
690 | } else { |
691 | struct passwd *pw = getpwnam(optarg); |
692 | if (!pw) |
693 | die(1, "unknown user `%s'", optarg); |
694 | drop = pw->pw_uid; |
695 | } |
696 | break; |
697 | case 'g': |
698 | if (isdigit((unsigned char )optarg[0])) { |
699 | char *q; |
700 | dropg = strtol(optarg, &q, 0); |
701 | if (*q) |
702 | die(1, "bad gid `%s'", optarg); |
703 | } else { |
704 | struct group *gr = getgrnam(optarg); |
705 | if (!gr) |
706 | die(1, "unknown group `%s'", optarg); |
707 | dropg = gr->gr_gid; |
708 | } |
709 | break; |
e82f7154 |
710 | default: |
711 | f |= f_bogus; |
712 | break; |
713 | } |
714 | } |
715 | |
716 | if (f & f_bogus) { |
717 | usage(stderr); |
718 | exit(1); |
719 | } |
372a98e2 |
720 | *cff = 0; |
e82f7154 |
721 | |
722 | /* --- Deal with the remaining arguments --- */ |
723 | |
61e3dbdf |
724 | if (optind < argc) |
725 | scan_add(&sc, scan_argv(argv + optind)); |
726 | else if (f & f_file) |
727 | /* Cool */; |
728 | else if (!isatty(STDIN_FILENO)) |
729 | scan_add(&sc, scan_file(stdin, "<stdin>", SCF_NOCLOSE)); |
730 | else { |
731 | moan("no configuration given and stdin is a terminal."); |
732 | moan("type `%s --help' for usage information.", QUIS); |
733 | exit(1); |
e82f7154 |
734 | } |
735 | |
61e3dbdf |
736 | /* --- Parse the configuration now gathered --- */ |
e82f7154 |
737 | |
8c0a939e |
738 | parse(&sc); |
e82f7154 |
739 | |
372a98e2 |
740 | /* --- Set up some signal handlers --- * |
741 | * |
742 | * Don't enable @SIGINT@ if the caller already disabled it. |
743 | */ |
744 | |
745 | { |
746 | struct sigaction sa; |
747 | |
748 | sig_add(&s_term, SIGTERM, fw_tidy, 0); |
749 | sig_add(&s_quit, SIGQUIT, fw_die, 0); |
750 | sigaction(SIGINT, 0, &sa); |
751 | if (sa.sa_handler != SIG_IGN) |
752 | sig_add(&s_int, SIGINT, fw_tidy, 0); |
753 | sig_add(&s_hup, SIGHUP, fw_reload, 0); |
754 | } |
755 | |
fc170a33 |
756 | /* --- Drop privileges --- */ |
757 | |
ee599f55 |
758 | if (drop != (uid_t)-1) |
759 | privconn_split(sel); |
fc170a33 |
760 | #ifdef HAVE_SETGROUPS |
00e3c0f1 |
761 | if ((dropg != (gid_t)-1 && (setgid(dropg) || setgroups(1, &dropg))) || |
762 | (drop != (uid_t)-1 && setuid(drop))) |
f9d40245 |
763 | die(1, "couldn't drop privileges: %s", strerror(errno)); |
fc170a33 |
764 | #else |
00e3c0f1 |
765 | if ((dropg != (gid_t)-1 && setgid(dropg)) || |
766 | (drop != (uid_t)-1 && setuid(drop))) |
fc170a33 |
767 | die(1, "couldn't drop privileges: %s", strerror(errno)); |
f9d40245 |
768 | #endif |
fc170a33 |
769 | |
e82f7154 |
770 | /* --- Fork into the background --- */ |
771 | |
772 | if (f & f_fork) { |
773 | pid_t kid; |
774 | |
775 | kid = fork(); |
776 | if (kid == -1) |
777 | die(1, "couldn't fork: %s", strerror(errno)); |
778 | if (kid != 0) |
779 | _exit(0); |
780 | |
781 | close(0); close(1); close(2); |
afd7451e |
782 | chdir("/"); |
e82f7154 |
783 | setsid(); |
784 | |
785 | kid = fork(); |
786 | if (kid != 0) |
787 | _exit(0); |
17be1d6b |
788 | } |
afd7451e |
789 | |
17be1d6b |
790 | if (f & f_syslog) { |
afd7451e |
791 | flags |= FW_SYSLOG; |
792 | openlog(QUIS, 0, LOG_DAEMON); |
e82f7154 |
793 | } |
794 | |
795 | /* --- Let rip --- */ |
796 | |
61e3dbdf |
797 | if (!(flags & FW_SET)) |
798 | moan("nothing to do!"); |
799 | signal(SIGPIPE, SIG_IGN); |
f9d40245 |
800 | |
801 | { |
802 | int selerr = 0; |
803 | while (active) { |
804 | if (!sel_select(sel)) |
805 | selerr = 0; |
372a98e2 |
806 | else if (errno != EINTR && errno != EAGAIN) { |
f9d40245 |
807 | fw_log(-1, "error from select: %s", strerror(errno)); |
808 | selerr++; |
809 | if (selerr > 8) { |
810 | fw_log(-1, "too many consecutive select errors: bailing out"); |
811 | exit(EXIT_FAILURE); |
812 | } |
813 | } |
814 | } |
815 | } |
816 | |
e82f7154 |
817 | return (0); |
818 | } |
819 | |
820 | /*----- That's all, folks -------------------------------------------------*/ |