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1 | /* -*-c-*- |
2 | * |
2f8a65a1 |
3 | * $Id: fw.c,v 1.12 2002/01/13 14:49:17 mdw Exp $ |
e82f7154 |
4 | * |
5 | * Port forwarding thingy |
6 | * |
61e3dbdf |
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 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: fw.c,v $ |
2f8a65a1 |
32 | * Revision 1.12 2002/01/13 14:49:17 mdw |
33 | * Track @dstr_vputf@ change. |
34 | * |
a8b9c5eb |
35 | * Revision 1.11 2001/02/03 20:33:26 mdw |
36 | * Fix flags to be unsigned. |
37 | * |
372a98e2 |
38 | * Revision 1.10 2001/02/03 20:30:03 mdw |
39 | * Support re-reading config files on SIGHUP. |
40 | * |
f9d40245 |
41 | * Revision 1.9 2001/01/20 11:55:17 mdw |
42 | * Handle select errors more robustly. |
43 | * |
1e8a64e8 |
44 | * Revision 1.8 2000/03/23 23:19:19 mdw |
45 | * Fix changed options in parser table. |
46 | * |
fc170a33 |
47 | * Revision 1.7 2000/03/23 00:37:33 mdw |
48 | * Add option to change user and group after initialization. Naughtily |
49 | * reassign short equivalents of --grammar and --options. |
50 | * |
17be1d6b |
51 | * Revision 1.6 1999/12/22 15:44:10 mdw |
52 | * Make syslog a separate option, and do it better. |
53 | * |
06d82312 |
54 | * Revision 1.5 1999/10/22 22:47:50 mdw |
55 | * Grammar changes. Also, don't enable SIGINT if it's currently ignored. |
56 | * |
2d9ec601 |
57 | * Revision 1.4 1999/10/10 16:46:12 mdw |
58 | * New resolver to initialize. Also, include options for grammar and |
59 | * options references. |
60 | * |
61e3dbdf |
61 | * Revision 1.3 1999/07/26 23:30:42 mdw |
62 | * Major reconstruction work for new design. |
63 | * |
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64 | * Revision 1.2 1999/07/03 13:55:17 mdw |
65 | * Various changes. Add configuration grammar to help text. Change to |
66 | * root directory and open syslog when forking into background. |
67 | * |
68 | * Revision 1.1.1.1 1999/07/01 08:56:23 mdw |
69 | * Initial revision. |
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70 | * |
71 | */ |
72 | |
73 | /*----- Header files ------------------------------------------------------*/ |
74 | |
75 | #include "config.h" |
76 | |
372a98e2 |
77 | #include <assert.h> |
e82f7154 |
78 | #include <ctype.h> |
79 | #include <errno.h> |
61e3dbdf |
80 | #include <signal.h> |
81 | #include <stdarg.h> |
e82f7154 |
82 | #include <stdio.h> |
83 | #include <stdlib.h> |
84 | #include <string.h> |
61e3dbdf |
85 | #include <time.h> |
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86 | |
87 | #include <unistd.h> |
88 | #include <syslog.h> |
89 | |
fc170a33 |
90 | #include <grp.h> |
91 | #include <pwd.h> |
92 | |
2d9ec601 |
93 | #include <mLib/bres.h> |
61e3dbdf |
94 | #include <mLib/dstr.h> |
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95 | #include <mLib/mdwopt.h> |
96 | #include <mLib/quis.h> |
97 | #include <mLib/report.h> |
98 | #include <mLib/sel.h> |
61e3dbdf |
99 | #include <mLib/sig.h> |
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100 | #include <mLib/sub.h> |
101 | |
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102 | #include "conf.h" |
61e3dbdf |
103 | #include "endpt.h" |
104 | #include "exec.h" |
105 | #include "fattr.h" |
afd7451e |
106 | #include "fw.h" |
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107 | #include "scan.h" |
61e3dbdf |
108 | #include "source.h" |
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109 | |
afd7451e |
110 | /*----- Global variables --------------------------------------------------*/ |
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111 | |
112 | sel_state *sel; /* Multiplexor for nonblocking I/O */ |
61e3dbdf |
113 | |
114 | /*----- Static variables --------------------------------------------------*/ |
115 | |
372a98e2 |
116 | typedef struct conffile { |
117 | struct conffile *next; |
118 | char *name; |
119 | } conffile; |
120 | |
61e3dbdf |
121 | static unsigned flags = 0; /* Global state flags */ |
122 | static unsigned active = 0; /* Number of active things */ |
372a98e2 |
123 | static conffile *conffiles = 0; /* List of configuration files */ |
61e3dbdf |
124 | |
125 | #define FW_SYSLOG 1u |
126 | #define FW_QUIET 2u |
127 | #define FW_SET 4u |
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128 | |
129 | /*----- Main code ---------------------------------------------------------*/ |
130 | |
61e3dbdf |
131 | /* --- @fw_log@ --- * |
132 | * |
133 | * Arguments: @time_t t@ = when the connection occurred or (@-1@) |
134 | * @const char *fmt@ = format string to fill in |
135 | * @...@ = other arguments |
136 | * |
137 | * Returns: --- |
138 | * |
139 | * Use: Logs a connection. |
140 | */ |
141 | |
142 | void fw_log(time_t t, const char *fmt, ...) |
143 | { |
144 | struct tm *tm; |
145 | dstr d = DSTR_INIT; |
146 | va_list ap; |
147 | |
148 | if (flags & FW_QUIET) |
149 | return; |
150 | |
151 | if (t == -1) |
152 | t = time(0); |
153 | tm = localtime(&t); |
154 | DENSURE(&d, 64); |
17be1d6b |
155 | d.len += strftime(d.buf, d.sz, "%Y-%m-%d %H:%M:%S ", tm); |
61e3dbdf |
156 | va_start(ap, fmt); |
2f8a65a1 |
157 | dstr_vputf(&d, fmt, &ap); |
61e3dbdf |
158 | va_end(ap); |
159 | if (flags & FW_SYSLOG) |
160 | syslog(LOG_NOTICE, "%s", d.buf); |
161 | else { |
162 | DPUTC(&d, '\n'); |
163 | dstr_write(&d, stderr); |
164 | } |
165 | DDESTROY(&d); |
166 | } |
167 | |
168 | /* --- @fw_inc@, @fw_dec@ --- * |
169 | * |
170 | * Arguments: --- |
171 | * |
172 | * Returns: --- |
173 | * |
174 | * Use: Increments or decrements the active thing count. `fw' won't |
175 | * quit while there are active things. |
176 | */ |
177 | |
178 | void fw_inc(void) { flags |= FW_SET; active++; } |
179 | void fw_dec(void) { if (active) active--; } |
180 | |
181 | /* --- @fw_exit@ --- * |
182 | * |
183 | * Arguments: --- |
184 | * |
185 | * Returns: --- |
186 | * |
187 | * Use: Exits when appropriate. |
188 | */ |
189 | |
190 | static void fw_exit(void) |
191 | { |
192 | endpt_killall(); |
193 | source_killall(); |
194 | } |
195 | |
196 | /* --- @fw_tidy@ --- * |
197 | * |
198 | * Arguments: @int n@ = signal number |
199 | * @void *p@ = an uninteresting argument |
200 | * |
201 | * Returns: --- |
202 | * |
203 | * Use: Handles various signals and causes a clean tidy-up. |
204 | */ |
205 | |
206 | static void fw_tidy(int n, void *p) |
207 | { |
372a98e2 |
208 | const char *sn = 0; |
209 | switch (n) { |
210 | case SIGTERM: sn = "SIGTERM"; break; |
211 | case SIGINT: sn = "SIGINT"; break; |
212 | default: abort(); |
213 | } |
214 | |
215 | fw_log(-1, "closing down gracefully on %s", sn); |
216 | source_killall(); |
217 | } |
218 | |
219 | /* --- @fw_die@ --- * |
220 | * |
221 | * Arguments: @int n@ = signal number |
222 | * @void *p@ = an uninteresting argument |
223 | * |
224 | * Returns: --- |
225 | * |
226 | * Use: Handles various signals and causes an abrupt shutdown. |
227 | */ |
228 | |
229 | static void fw_die(int n, void *p) |
230 | { |
231 | const char *sn = 0; |
232 | switch (n) { |
233 | case SIGQUIT: sn = "SIGQUIT"; break; |
234 | default: abort(); |
235 | } |
236 | |
237 | fw_log(-1, "closing down abruptly on %s", sn); |
238 | source_killall(); |
239 | endpt_killall(); |
240 | } |
241 | |
242 | /* --- @fw_reload@ --- * |
243 | * |
244 | * Arguments: @int n@ = a signal number |
245 | * @void *p@ = an uninteresting argument |
246 | * |
247 | * Returns: --- |
248 | * |
249 | * Use: Handles a hangup signal by re-reading configuration files. |
250 | */ |
251 | |
252 | static void fw_reload(int n, void *p) |
253 | { |
254 | FILE *fp; |
255 | scanner sc; |
256 | conffile *cf; |
257 | |
258 | assert(n == SIGHUP); |
259 | if (!conffiles) { |
260 | fw_log(-1, "no configuration files to reload: ignoring SIGHUP"); |
261 | return; |
262 | } |
263 | fw_log(-1, "reloading configuration files..."); |
264 | source_killall(); |
265 | scan_create(&sc); |
266 | for (cf = conffiles; cf; cf = cf->next) { |
267 | if ((fp = fopen(cf->name, "r")) == 0) |
268 | fw_log(-1, "error loading `%s': %s", cf->name, strerror(errno)); |
269 | else |
270 | scan_add(&sc, scan_file(fp, cf->name, 0)); |
271 | } |
272 | conf_parse(&sc); |
273 | fw_log(-1, "... reload completed OK"); |
61e3dbdf |
274 | } |
275 | |
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276 | /* --- Standard GNU help options --- */ |
277 | |
278 | static void version(FILE *fp) |
279 | { |
2d9ec601 |
280 | pquis(fp, "$ version " VERSION "\n"); |
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281 | } |
282 | |
283 | static void usage(FILE *fp) |
284 | { |
17be1d6b |
285 | pquis(fp, "Usage: $ [-dql] [-f file] [config statements...]\n"); |
e82f7154 |
286 | } |
287 | |
288 | static void help(FILE *fp) |
289 | { |
290 | version(fp); |
291 | fputc('\n', fp); |
292 | usage(fp); |
2d9ec601 |
293 | pquis(fp, "\n\ |
61e3dbdf |
294 | An excessively full-featured port-forwarder, which subsumes large chunks\n\ |
295 | of the functionality of inetd, netcat, and normal cat. Options available\n\ |
296 | are:\n\ |
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297 | \n\ |
17be1d6b |
298 | -h, --help Display this help message.\n\ |
299 | -v, --version Display the program's version number.\n\ |
300 | -u, --usage Display a terse usage summary.\n\ |
e82f7154 |
301 | \n\ |
fc170a33 |
302 | -G, --grammar Show a summary of the configuration language.\n\ |
303 | -O, --options Show a summary of the source and target options.\n\ |
2d9ec601 |
304 | \n\ |
17be1d6b |
305 | -f, --file=FILE Read configuration from a file.\n\ |
306 | -q, --quiet Don't emit any logging information.\n\ |
307 | -d, --daemon Fork into background after initializing.\n\ |
308 | -l, --syslog Send log output to the system logger.\n\ |
fc170a33 |
309 | -s, --setuid=USER Change uid to USER after initializing sources.\n\ |
310 | -g, --setgid=GRP Change gid to GRP after initializing sources.\n\ |
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311 | \n\ |
312 | Configuration may be supplied in one or more configuration files, or on\n\ |
313 | the command line (or both). If no `-f' option is present, and no\n\ |
314 | configuration is given on the command line, the standard input stream is\n\ |
315 | read.\n\ |
316 | \n\ |
317 | Configuration is free-form. Comments begin with a `#' character and\n\ |
afd7451e |
318 | continue to the end of the line. Each command line argument is considered\n\ |
61e3dbdf |
319 | to be a separate line.\n\ |
afd7451e |
320 | \n\ |
2d9ec601 |
321 | The grammar is fairly complicated. For a summary, run `$ --grammar'.\n\ |
322 | For a summary of the various options, run `$ --options'.\n\ |
323 | "); |
324 | } |
325 | |
326 | /* --- Other helpful options --- */ |
327 | |
328 | static void grammar(FILE *fp) |
329 | { |
330 | version(fp); |
331 | pquis(fp, "\n\ |
332 | Grammar summary\n\ |
333 | \n\ |
334 | Basic syntax\n\ |
335 | file ::= empty | file stmt [`;']\n\ |
336 | stmt ::= option-stmt | fw-stmt\n\ |
337 | fw-stmt ::= `fw' source options [`to'|`->'] target options\n\ |
338 | options ::= `{' option-seq `}'\n\ |
339 | option-seq ::= empty | option-stmt [`;'] option-seq\n\ |
340 | \n\ |
341 | Option syntax\n\ |
342 | option-stmt ::= q-option\n\ |
343 | q-option ::= option\n\ |
344 | | prefix `.' q-option\n\ |
345 | | prefix `{' option-seq `}'\n\ |
346 | prefix ::= word\n\ |
347 | \n\ |
348 | File source and target\n\ |
349 | source ::= file\n\ |
350 | target ::= file\n\ |
351 | file ::= `file' [`.'] fspec [`,' fspec]\n\ |
352 | fspec ::= fd-spec | name-spec | null-spec\n\ |
353 | fd-spec ::= [[`:']`fd'[`:']] number|`stdin'|`stdout'\n\ |
354 | name-spec ::= [[`:']`file'[`:']] file-name\n\ |
355 | file-name ::= path-seq | [ path-seq ]\n\ |
356 | path-seq ::= path-elt | path-seq path-elt\n\ |
357 | path-elt ::= `/' | word\n\ |
358 | null-spec ::= [`:']`null'[`:']\n\ |
359 | \n\ |
360 | Exec source and target\n\ |
361 | source ::= exec\n\ |
362 | target ::= exec\n\ |
363 | exec ::= `exec' [`.'] cmd-spec\n\ |
364 | cmd-spec ::= shell-cmd | [prog-name] `[' argv0 arg-seq `]'\n\ |
365 | arg-seq ::= word | arg-seq word\n\ |
366 | shell-cmd ::= word\n\ |
367 | argv0 ::= word\n\ |
368 | \n\ |
369 | Socket source and target\n\ |
370 | source ::= socket-source\n\ |
371 | target ::= socket-target\n\ |
372 | socket-source ::= [`socket'[`.']] [[`:']addr-type[`:']] source-addr\n\ |
373 | socket-target ::= [`socket'[`.']] [[`:']addr-type[`:']] target-addr\n\ |
374 | \n\ |
375 | inet-source-addr ::= [port] port\n\ |
376 | inet-target-addr ::= address [`:'] port\n\ |
377 | address ::= addr-elt | address addr-elt\n\ |
378 | addr-elt ::= `.' | word\n\ |
379 | \n\ |
380 | unix-source-addr ::= file-name\n\ |
381 | unix-target-addr ::= file-name\n\ |
382 | "); |
383 | } |
384 | |
385 | static void options(FILE *fp) |
386 | { |
387 | version(fp); |
388 | pquis(fp, "\n\ |
389 | Options summary\n\ |
390 | \n\ |
391 | File attributes (`fattr')\n\ |
392 | prefix.fattr.mode [=] mode\n\ |
393 | prefix.fattr.owner [=] user\n\ |
394 | prefix.fattr.group [=] group\n\ |
395 | \n\ |
396 | File options\n\ |
397 | file.create [=] yes|no\n\ |
398 | file.open [=] no|truncate|append\n\ |
399 | file.fattr.*\n\ |
400 | \n\ |
401 | Exec options\n\ |
402 | exec.logging [=] yes|no\n\ |
403 | exec.dir [=] file-name\n\ |
404 | exec.root [=] file-name\n\ |
405 | exec.user [=] user\n\ |
406 | exec.group [=] group\n\ |
407 | exec.rlimit.limit[.hard|.soft] [=] value\n\ |
408 | exec.env.clear\n\ |
409 | exec.env.unset var\n\ |
410 | exec.env.[set] var [=] value\n\ |
411 | \n\ |
412 | Socket options\n\ |
06d82312 |
413 | socket.conn [=] number|unlimited|one-shot\n\ |
2d9ec601 |
414 | socket.logging [=] yes|no\n\ |
415 | socket.inet.[allow|deny] [from] address [/ address]\n\ |
416 | socket.unix.fattr.*\n\ |
417 | "); |
e82f7154 |
418 | } |
419 | |
420 | /* --- @main@ --- * |
421 | * |
422 | * Arguments: @int argc@ = number of command line arguments |
423 | * @char *argv[]@ = vector of argument strings |
424 | * |
425 | * Returns: --- |
426 | * |
427 | * Use: Simple port-forwarding server. |
428 | */ |
429 | |
430 | int main(int argc, char *argv[]) |
431 | { |
432 | unsigned f = 0; |
433 | sel_state sst; |
372a98e2 |
434 | sig s_term, s_quit, s_int, s_hup; |
61e3dbdf |
435 | scanner sc; |
fc170a33 |
436 | uid_t drop = -1; |
437 | gid_t dropg = -1; |
372a98e2 |
438 | conffile *cf, **cff = &conffiles; |
e82f7154 |
439 | |
372a98e2 |
440 | #define f_bogus 1u |
a8b9c5eb |
441 | #define f_file 2u |
442 | #define f_syslog 4u |
443 | #define f_fork 8u |
e82f7154 |
444 | |
445 | /* --- Initialize things --- */ |
446 | |
447 | ego(argv[0]); |
448 | sel = &sst; |
449 | sel_init(sel); |
450 | sub_init(); |
61e3dbdf |
451 | sig_init(sel); |
e82f7154 |
452 | bres_init(sel); |
2d9ec601 |
453 | bres_exec(0); |
61e3dbdf |
454 | exec_init(); |
455 | fattr_init(&fattr_global); |
456 | scan_create(&sc); |
457 | |
61e3dbdf |
458 | atexit(fw_exit); |
e82f7154 |
459 | |
460 | /* --- Parse command line options --- */ |
461 | |
462 | for (;;) { |
463 | static struct option opts[] = { |
464 | |
465 | /* --- Standard GNU help options --- */ |
466 | |
467 | { "help", 0, 0, 'h' }, |
468 | { "version", 0, 0, 'v' }, |
469 | { "usage", 0, 0, 'u' }, |
470 | |
2d9ec601 |
471 | /* --- Other help options --- */ |
472 | |
1e8a64e8 |
473 | { "grammar", 0, 0, 'G' }, |
474 | { "options", 0, 0, 'O' }, |
2d9ec601 |
475 | |
e82f7154 |
476 | /* --- Other useful arguments --- */ |
477 | |
478 | { "file", OPTF_ARGREQ, 0, 'f' }, |
61e3dbdf |
479 | { "fork", 0, 0, 'd' }, |
480 | { "daemon", 0, 0, 'd' }, |
17be1d6b |
481 | { "syslog", 0, 0, 'l' }, |
482 | { "log", 0, 0, 'l' }, |
61e3dbdf |
483 | { "quiet", 0, 0, 'q' }, |
fc170a33 |
484 | { "setuid", OPTF_ARGREQ, 0, 's' }, |
485 | { "uid", OPTF_ARGREQ, 0, 's' }, |
486 | { "setgid", OPTF_ARGREQ, 0, 'g' }, |
487 | { "gid", OPTF_ARGREQ, 0, 'g' }, |
e82f7154 |
488 | |
489 | /* --- Magic terminator --- */ |
490 | |
491 | { 0, 0, 0, 0 } |
492 | }; |
fc170a33 |
493 | int i = mdwopt(argc, argv, "+hvu GO f:dls:g:", opts, 0, 0, 0); |
e82f7154 |
494 | |
495 | if (i < 0) |
496 | break; |
497 | switch (i) { |
498 | case 'h': |
499 | help(stdout); |
500 | exit(0); |
501 | break; |
502 | case 'v': |
503 | version(stdout); |
504 | exit(0); |
505 | break; |
506 | case 'u': |
507 | usage(stdout); |
508 | exit(0); |
509 | break; |
fc170a33 |
510 | case 'G': |
2d9ec601 |
511 | grammar(stdout); |
512 | exit(0); |
513 | break; |
fc170a33 |
514 | case 'O': |
2d9ec601 |
515 | options(stdout); |
516 | exit(0); |
517 | break; |
61e3dbdf |
518 | case 'f': |
519 | if (strcmp(optarg, "-") == 0) |
520 | scan_add(&sc, scan_file(stdin, "<stdin>", SCF_NOCLOSE)); |
521 | else { |
522 | FILE *fp; |
523 | if ((fp = fopen(optarg, "r")) == 0) |
524 | die(1, "couldn't open file `%s': %s", optarg, strerror(errno)); |
372a98e2 |
525 | cf = CREATE(conffile); |
526 | cf->name = optarg; |
527 | *cff = cf; |
528 | cff = &cf->next; |
61e3dbdf |
529 | scan_add(&sc, scan_file(fp, optarg, 0)); |
530 | } |
e82f7154 |
531 | f |= f_file; |
e82f7154 |
532 | break; |
61e3dbdf |
533 | case 'd': |
e82f7154 |
534 | f |= f_fork; |
535 | break; |
17be1d6b |
536 | case 'l': |
537 | f |= f_syslog; |
538 | break; |
61e3dbdf |
539 | case 'q': |
540 | flags |= FW_QUIET; |
541 | break; |
fc170a33 |
542 | case 's': |
543 | if (isdigit((unsigned char )optarg[0])) { |
544 | char *q; |
545 | drop = strtol(optarg, &q, 0); |
546 | if (*q) |
547 | die(1, "bad uid `%s'", optarg); |
548 | } else { |
549 | struct passwd *pw = getpwnam(optarg); |
550 | if (!pw) |
551 | die(1, "unknown user `%s'", optarg); |
552 | drop = pw->pw_uid; |
553 | } |
554 | break; |
555 | case 'g': |
556 | if (isdigit((unsigned char )optarg[0])) { |
557 | char *q; |
558 | dropg = strtol(optarg, &q, 0); |
559 | if (*q) |
560 | die(1, "bad gid `%s'", optarg); |
561 | } else { |
562 | struct group *gr = getgrnam(optarg); |
563 | if (!gr) |
564 | die(1, "unknown group `%s'", optarg); |
565 | dropg = gr->gr_gid; |
566 | } |
567 | break; |
e82f7154 |
568 | default: |
569 | f |= f_bogus; |
570 | break; |
571 | } |
572 | } |
573 | |
574 | if (f & f_bogus) { |
575 | usage(stderr); |
576 | exit(1); |
577 | } |
372a98e2 |
578 | *cff = 0; |
e82f7154 |
579 | |
580 | /* --- Deal with the remaining arguments --- */ |
581 | |
61e3dbdf |
582 | if (optind < argc) |
583 | scan_add(&sc, scan_argv(argv + optind)); |
584 | else if (f & f_file) |
585 | /* Cool */; |
586 | else if (!isatty(STDIN_FILENO)) |
587 | scan_add(&sc, scan_file(stdin, "<stdin>", SCF_NOCLOSE)); |
588 | else { |
589 | moan("no configuration given and stdin is a terminal."); |
590 | moan("type `%s --help' for usage information.", QUIS); |
591 | exit(1); |
e82f7154 |
592 | } |
593 | |
61e3dbdf |
594 | /* --- Parse the configuration now gathered --- */ |
e82f7154 |
595 | |
61e3dbdf |
596 | conf_parse(&sc); |
e82f7154 |
597 | |
372a98e2 |
598 | /* --- Set up some signal handlers --- * |
599 | * |
600 | * Don't enable @SIGINT@ if the caller already disabled it. |
601 | */ |
602 | |
603 | { |
604 | struct sigaction sa; |
605 | |
606 | sig_add(&s_term, SIGTERM, fw_tidy, 0); |
607 | sig_add(&s_quit, SIGQUIT, fw_die, 0); |
608 | sigaction(SIGINT, 0, &sa); |
609 | if (sa.sa_handler != SIG_IGN) |
610 | sig_add(&s_int, SIGINT, fw_tidy, 0); |
611 | sig_add(&s_hup, SIGHUP, fw_reload, 0); |
612 | } |
613 | |
fc170a33 |
614 | /* --- Drop privileges --- */ |
615 | |
616 | #ifdef HAVE_SETGROUPS |
617 | if ((dropg != -1 && (setgid(dropg) || setgroups(1, &dropg))) || |
f9d40245 |
618 | (drop != -1 && setuid(drop))) |
619 | die(1, "couldn't drop privileges: %s", strerror(errno)); |
fc170a33 |
620 | #else |
621 | if ((dropg != -1 && setgid(dropg)) || |
fc170a33 |
622 | (drop != -1 && setuid(drop))) |
623 | die(1, "couldn't drop privileges: %s", strerror(errno)); |
f9d40245 |
624 | #endif |
fc170a33 |
625 | |
e82f7154 |
626 | /* --- Fork into the background --- */ |
627 | |
628 | if (f & f_fork) { |
629 | pid_t kid; |
630 | |
631 | kid = fork(); |
632 | if (kid == -1) |
633 | die(1, "couldn't fork: %s", strerror(errno)); |
634 | if (kid != 0) |
635 | _exit(0); |
636 | |
637 | close(0); close(1); close(2); |
afd7451e |
638 | chdir("/"); |
e82f7154 |
639 | setsid(); |
640 | |
641 | kid = fork(); |
642 | if (kid != 0) |
643 | _exit(0); |
17be1d6b |
644 | } |
afd7451e |
645 | |
17be1d6b |
646 | if (f & f_syslog) { |
afd7451e |
647 | flags |= FW_SYSLOG; |
648 | openlog(QUIS, 0, LOG_DAEMON); |
e82f7154 |
649 | } |
650 | |
651 | /* --- Let rip --- */ |
652 | |
61e3dbdf |
653 | if (!(flags & FW_SET)) |
654 | moan("nothing to do!"); |
655 | signal(SIGPIPE, SIG_IGN); |
f9d40245 |
656 | |
657 | { |
658 | int selerr = 0; |
659 | while (active) { |
660 | if (!sel_select(sel)) |
661 | selerr = 0; |
372a98e2 |
662 | else if (errno != EINTR && errno != EAGAIN) { |
f9d40245 |
663 | fw_log(-1, "error from select: %s", strerror(errno)); |
664 | selerr++; |
665 | if (selerr > 8) { |
666 | fw_log(-1, "too many consecutive select errors: bailing out"); |
667 | exit(EXIT_FAILURE); |
668 | } |
669 | } |
670 | } |
671 | } |
672 | |
e82f7154 |
673 | return (0); |
674 | } |
675 | |
676 | /*----- That's all, folks -------------------------------------------------*/ |