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