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e82f7154 | 1 | /* -*-c-*- |
2 | * | |
e82f7154 | 3 | * Main header file for port forwarder |
4 | * | |
61e3dbdf | 5 | * (c) 1999 Straylight/Edgeware |
e82f7154 | 6 | */ |
7 | ||
206212ca | 8 | /*----- Licensing notice --------------------------------------------------* |
e82f7154 | 9 | * |
9155ea97 | 10 | * This file is part of the `fwd' port forwarder. |
e82f7154 | 11 | * |
9155ea97 | 12 | * `fwd' is free software; you can redistribute it and/or modify |
e82f7154 | 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, |
e82f7154 | 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 | * |
e82f7154 | 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, |
e82f7154 | 24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
25 | */ | |
26 | ||
e82f7154 | 27 | #ifndef FW_H |
28 | #define FW_H | |
29 | ||
30 | #ifdef __cplusplus | |
31 | extern "C" { | |
32 | #endif | |
33 | ||
34 | /*----- Header files ------------------------------------------------------*/ | |
35 | ||
47a7631f MW |
36 | /* --- Configuration --- */ |
37 | ||
38 | #include "config.h" | |
39 | #define _GNU_SOURCE | |
40 | ||
41 | /* --- ANSI C --- */ | |
42 | ||
43 | #include <assert.h> | |
44 | #include <ctype.h> | |
45 | #include <errno.h> | |
46 | #include <float.h> | |
47 | #include <limits.h> | |
48 | #include <math.h> | |
49 | #include <signal.h> | |
50 | #include <stdarg.h> | |
51 | #include <stddef.h> | |
52 | #include <stdio.h> | |
53 | #include <stdlib.h> | |
54 | #include <string.h> | |
61e3dbdf | 55 | #include <time.h> |
47a7631f MW |
56 | |
57 | /* --- Unix --- */ | |
58 | ||
61e3dbdf | 59 | #include <fcntl.h> |
47a7631f MW |
60 | #include <unistd.h> |
61 | ||
62 | #include <sys/types.h> | |
63 | #include <sys/stat.h> | |
64 | #include <sys/time.h> | |
65 | #include <sys/uio.h> | |
66 | #include <sys/wait.h> | |
67 | ||
68 | #include <sys/socket.h> | |
69 | #include <sys/un.h> | |
70 | #include <netinet/in.h> | |
71 | #include <arpa/inet.h> | |
72 | #include <netdb.h> | |
73 | ||
74 | #include <pwd.h> | |
75 | #include <grp.h> | |
76 | ||
77 | #include <syslog.h> | |
78 | ||
79 | /* --- mLib --- */ | |
80 | ||
81 | #include <mLib/alloc.h> | |
82 | #include <mLib/bres.h> | |
83 | #include <mLib/conn.h> | |
84 | #include <mLib/darray.h> | |
85 | #include <mLib/dstr.h> | |
86 | #include <mLib/env.h> | |
87 | #include <mLib/fdflags.h> | |
88 | #include <mLib/fdpass.h> | |
89 | #include <mLib/ident.h> | |
90 | #include <mLib/mdwopt.h> | |
91 | #include <mLib/quis.h> | |
92 | #include <mLib/report.h> | |
e82f7154 | 93 | #include <mLib/sel.h> |
47a7631f MW |
94 | #include <mLib/selbuf.h> |
95 | #include <mLib/sig.h> | |
96 | #include <mLib/str.h> | |
97 | #include <mLib/sub.h> | |
98 | #include <mLib/sym.h> | |
99 | #include <mLib/tv.h> | |
100 | ||
101 | /*----- Other subtleties --------------------------------------------------*/ | |
102 | ||
103 | #if defined(HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON | |
104 | extern char **environ; | |
105 | #endif | |
106 | ||
107 | /*----- Main program ------------------------------------------------------*/ | |
e82f7154 | 108 | |
47a7631f | 109 | /* --- The global select state --- */ |
e82f7154 | 110 | |
111 | extern sel_state *sel; | |
4fe31371 | 112 | |
47a7631f MW |
113 | /* --- Help text --- */ |
114 | ||
115 | extern const char grammar_text[]; | |
116 | extern const char option_text[]; | |
61e3dbdf | 117 | |
118 | /* --- @fw_log@ --- * | |
119 | * | |
120 | * Arguments: @time_t t@ = when the connection occurred or (@-1@) | |
121 | * @const char *fmt@ = format string to fill in | |
122 | * @...@ = other arguments | |
123 | * | |
124 | * Returns: --- | |
125 | * | |
126 | * Use: Logs a connection. | |
127 | */ | |
128 | ||
129 | extern void fw_log(time_t /*t*/, const char */*fmt*/, ...); | |
130 | ||
131 | /* --- @fw_inc@, @fw_dec@ --- * | |
132 | * | |
133 | * Arguments: --- | |
134 | * | |
135 | * Returns: --- | |
136 | * | |
9155ea97 | 137 | * Use: Increments or decrements the active thing count. `fwd' won't |
61e3dbdf | 138 | * quit while there are active things. |
139 | */ | |
140 | ||
141 | extern void fw_inc(void); | |
142 | extern void fw_dec(void); | |
e82f7154 | 143 | |
47a7631f MW |
144 | /*----- Channel management ------------------------------------------------*/ |
145 | ||
146 | /* --- Magic numbers --- */ | |
147 | ||
148 | #define CHAN_BUFSZ 4096 | |
149 | ||
150 | /* --- Channel structure --- */ | |
151 | ||
152 | typedef struct chan { | |
153 | unsigned base, len; /* Base and length of data */ | |
154 | unsigned f; /* Various interesting flags */ | |
155 | void (*func)(void */*p*/); /* Function to call on closure */ | |
156 | void *p; /* Argument to pass function */ | |
157 | sel_file r, w; /* Reader and writer selectors */ | |
158 | char buf[CHAN_BUFSZ]; /* The actual data buffer */ | |
159 | } chan; | |
160 | ||
161 | #define CHANF_CLOSE 1u /* Close channel when buffer empty */ | |
162 | #define CHANF_READY 2u /* The channel destination exists */ | |
163 | ||
164 | /* --- @chan_close@ --- * | |
165 | * | |
166 | * Arguments: @chan *c@ = pointer to channel | |
167 | * | |
168 | * Returns: --- | |
169 | * | |
170 | * Use: Closes down a channel prematurely. | |
171 | */ | |
172 | ||
173 | extern void chan_close(chan */*c*/); | |
174 | ||
175 | /* --- @chan_dest@ --- * | |
176 | * | |
177 | * Arguments: @chan *c@ = pointer to channel | |
178 | * @int fd@ = destination file descriptor for channel | |
179 | * | |
180 | * Returns: --- | |
181 | * | |
182 | * Use: Sets the channel's destination so it knows where to put | |
183 | * data. | |
184 | */ | |
185 | ||
186 | extern void chan_dest(chan */*c*/, int /*fd*/); | |
187 | ||
188 | /* --- @chan_open@ --- * | |
189 | * | |
190 | * Arguments: @chan *c@ = pointer to channel to open | |
191 | * @int from, to@ = source and destination file descriptors | |
192 | * @void (*func)(void *p)@ = function to call on closure | |
193 | * @void *p@ = argument to pass to function | |
194 | * | |
195 | * Returns: --- | |
196 | * | |
197 | * Use: Opens a channel. Data is copied from the source to the | |
198 | * destination. The @to@ argument may be @-1@ if the file | |
199 | * descriptor isn't known yet. | |
200 | */ | |
201 | ||
202 | extern void chan_open(chan */*c*/, int /*from*/, int /*to*/, | |
203 | void (*/*func*/)(void */*p*/), void */*p*/); | |
204 | ||
205 | /*----- Character scanners ------------------------------------------------*/ | |
206 | ||
207 | /* --- A low-level scanner source --- */ | |
208 | ||
209 | typedef struct scansrc { | |
210 | struct scansrc *next; /* Next one in the list */ | |
211 | struct scansrc_ops *ops; /* Pointer to operations table */ | |
212 | char *src; /* Name of this source */ | |
213 | int line; /* Current line number */ | |
214 | dstr pushback; /* Pushback characters */ | |
215 | char *tok; /* Token pushback */ | |
216 | unsigned t; /* Token type pushback */ | |
217 | } scansrc; | |
218 | ||
219 | /* --- Scanner source operations --- */ | |
220 | ||
221 | typedef struct scansrc_ops { | |
222 | int (*scan)(scansrc */*ss*/); /* Read another character */ | |
223 | void (*destroy)(scansrc */*ss*/); /* Destroy an unwanted source */ | |
224 | } scansrc_ops; | |
225 | ||
226 | /* --- A character scanner --- */ | |
227 | ||
228 | typedef struct scanner { | |
229 | scansrc *head, **tail; /* Scanner list head and tail */ | |
230 | int t; /* Token type */ | |
231 | dstr d; /* Current token value */ | |
232 | const char *wbegin, *wcont; /* Parsing exception strings */ | |
233 | } scanner; | |
234 | ||
235 | /* --- @scan_file@ --- * | |
236 | * | |
237 | * Arguments: @FILE *fp@ = pointer to file descriptor | |
238 | * @const char *name@ = pointer to source file name | |
239 | * @unsigned f@ = flags | |
240 | * | |
241 | * Returns: A scanner source. | |
242 | * | |
243 | * Use: Creates a new scanner source for reading from a file. | |
244 | */ | |
245 | ||
246 | #define SCF_NOCLOSE 1u /* Don't close @fp@ when finished */ | |
247 | ||
248 | extern scansrc *scan_file(FILE */*fp*/, const char */*name*/, | |
249 | unsigned /*f*/); | |
250 | ||
251 | /* --- @scan_argv@ --- * | |
252 | * | |
253 | * Arguments: @char **av@ = pointer to argument array (null terminated) | |
254 | * | |
255 | * Returns: A scanner source. | |
256 | * | |
257 | * Use: Creates a new scanner source for reading from an @argv@ | |
258 | * array. | |
259 | */ | |
260 | ||
261 | extern scansrc *scan_argv(char **/*av*/); | |
262 | ||
263 | /* --- @scan@ --- * | |
264 | * | |
265 | * Arguments: @scanner *sc@ = pointer to main scanner context | |
266 | * | |
267 | * Returns: Character read, or end-of-file. | |
268 | * | |
269 | * Use: Scans a character from a source of characters. | |
270 | */ | |
271 | ||
272 | extern int scan(scanner */*sc*/); | |
273 | ||
274 | /* --- @unscan@ --- * | |
275 | * | |
276 | * Arguments: @scanner *sc@ = pointer to main scanner context | |
277 | * @int ch@ = character to unscan | |
278 | * | |
279 | * Returns: --- | |
280 | * | |
281 | * Use: Scans a character from a source of characters. | |
282 | */ | |
283 | ||
284 | extern void unscan(scanner */*sc*/, int /*ch*/); | |
285 | ||
286 | /* --- @scan_push@ --- * | |
287 | * | |
288 | * Arguments: @scanner *sc@ = pointer to main scanner context | |
289 | * @scansrc *ss@ = souorce to push | |
290 | * | |
291 | * Returns: --- | |
292 | * | |
293 | * Use: Pushes a scanner source onto the front of the queue. | |
294 | */ | |
295 | ||
296 | extern void scan_push(scanner */*sc*/, scansrc */*ss*/); | |
297 | ||
298 | /* --- @scan_add@ --- * | |
299 | * | |
300 | * Arguments: @scanner *sc@ = pointer to main scanner context | |
301 | * @scansrc *ss@ = souorce to push | |
302 | * | |
303 | * Returns: --- | |
304 | * | |
305 | * Use: Adds a scanner source onto the end of the queue. | |
306 | */ | |
307 | ||
308 | extern void scan_add(scanner */*sc*/, scansrc */*ss*/); | |
309 | ||
310 | /* --- @scan_create@ --- * | |
311 | * | |
312 | * Arguments: @scanner *sc@ = scanner context to initialize | |
313 | * | |
314 | * Returns: --- | |
315 | * | |
316 | * Use: Initializes a scanner block ready for use. | |
317 | */ | |
318 | ||
319 | extern void scan_create(scanner */*sc*/); | |
320 | ||
321 | /* --- @scan_destroy@ --- * | |
322 | * | |
323 | * Arguments: @scanner *sc@ = pointer to scanner context | |
324 | * | |
325 | * Returns: --- | |
326 | * | |
327 | * Use: Destroys a scanner and all the sources attached to it. | |
328 | */ | |
329 | ||
330 | extern void scan_destroy(scanner */*sc*/); | |
331 | ||
332 | /*----- Configuration parsing ---------------------------------------------*/ | |
333 | ||
334 | /* --- Magical constants --- */ | |
335 | ||
336 | #define CTOK_EOF (-1) | |
337 | #define CTOK_WORD 256 | |
338 | ||
339 | /* --- @conf_undelim@ --- * | |
340 | * | |
341 | * Arguments: @scanner *sc@ = pointer to scanner definition | |
342 | * @const char *d, *dd@ = pointer to characters to escape | |
343 | * | |
344 | * Returns: --- | |
345 | * | |
346 | * Use: Modifies the tokenizer. Characters in the first list will | |
347 | * always be considered to begin a word. Characters in the | |
348 | * second list will always be allowed to continue a word. | |
349 | */ | |
350 | ||
351 | extern void conf_undelim(scanner */*sc*/, | |
352 | const char */*d*/, const char */*dd*/); | |
353 | ||
354 | /* --- @token@ --- * | |
355 | * | |
356 | * Arguments: @scanner *sc@ = pointer to scanner definition | |
357 | * | |
358 | * Returns: Type of token scanned. | |
359 | * | |
360 | * Use: Reads the next token from the character scanner. | |
361 | */ | |
362 | ||
363 | extern int token(scanner */*sc*/); | |
364 | ||
365 | /* --- @error@ --- * | |
366 | * | |
367 | * Arguments: @scanner *sc@ = pointer to scanner definition | |
368 | * @const char *msg@ = message skeleton string | |
369 | * @...@ = extra arguments for the skeleton | |
370 | * | |
371 | * Returns: Doesn't | |
372 | * | |
373 | * Use: Reports an error at the current scanner location. | |
374 | */ | |
375 | ||
376 | extern void error(scanner */*sc*/, const char */*msg*/, ...); | |
377 | ||
378 | /* --- @pushback@ --- * | |
379 | * | |
380 | * Arguments: @scanner *sc@ = pointer to scanner definition | |
381 | * | |
382 | * Returns: --- | |
383 | * | |
384 | * Use: Pushes the current token back. This is normally a precursor | |
385 | * to pushing a new scanner source. | |
386 | */ | |
387 | ||
388 | extern void pushback(scanner */*sc*/); | |
389 | ||
390 | /* --- @conf_enum@ --- * | |
391 | * | |
392 | * Arguments: @scanner *sc@ = pointer to a scanner object | |
393 | * @const char *list@ = comma-separated things to allow | |
394 | * @unsigned @f = flags for the search | |
395 | * @const char *err@ = error message if not found | |
396 | * | |
397 | * Returns: Index into list, zero-based, or @-1@. | |
398 | * | |
399 | * Use: Checks whether the current token is a string which matches | |
400 | * one of the comma-separated items given. The return value is | |
401 | * the index (zero-based) of the matched string in the list. | |
402 | * | |
403 | * The flags control the behaviour if no exact match is found. | |
404 | * If @ENUM_ABBREV@ is set, and the current token is a left | |
405 | * substring of exactly one of the possibilities, then that one | |
406 | * is chosen. If @ENUM_NONE@ is set, the value @-1@ is | |
407 | * returned; otherwise an error is reported and the program is | |
408 | * terminated. | |
409 | */ | |
410 | ||
411 | #define ENUM_ABBREV 1u | |
412 | #define ENUM_NONE 2u | |
413 | ||
414 | extern int conf_enum(scanner */*sc*/, const char */*list*/, | |
415 | unsigned /*flags*/, const char */*err*/); | |
416 | ||
417 | /* --- @conf_prefix@ --- * | |
418 | * | |
419 | * Arguments: @scanner *sc@ = pointer to a scanner object | |
420 | * @const char *p@ = pointer to prefix string to check | |
421 | * | |
422 | * Returns: Nonzero if the prefix matches. | |
423 | * | |
424 | * Use: If the current token is a word matching the given prefix | |
425 | * string, then it and an optional `.' character are removed and | |
426 | * a nonzero result is returned. Otherwise the current token is | |
427 | * left as it is, and zero is returned. | |
428 | * | |
429 | * Typical options parsing code would remove an expected prefix, | |
430 | * scan an option anyway (since qualifying prefixes are | |
431 | * optional) and if a match is found, claim the option. If no | |
432 | * match is found, and a prefix was stripped, then an error | |
433 | * should be reported. | |
434 | */ | |
435 | ||
436 | extern int conf_prefix(scanner */*sc*/, const char */*p*/); | |
437 | ||
438 | /* --- @CONF_BEGIN@, @CONF_END@ --- * | |
439 | * | |
440 | * Arguments: @sc@ = scanner to read from | |
441 | * @prefix@ = prefix to scan for | |
442 | * @desc@ = description of what we're parsing | |
443 | * | |
444 | * Use: Bracket an options parsing routine. The current token is | |
445 | * checked to see whether it matches the prefix. If so, it is | |
446 | * removed and the following token examined. If that's a `.' | |
447 | * then it's removed. If it's a `{' then the enclosed | |
448 | * option-parsing code is executed in a loop until a matching | |
449 | * '}' is found. If the options parser doesn't accept an | |
450 | * option, the behaviour is dependent on whether a prefix was | |
451 | * seen: if so, an error is reported; otherwse a zero return is | |
452 | * made. | |
453 | */ | |
454 | ||
455 | #define CS_PLAIN 0 | |
456 | #define CS_PREFIX 1 | |
457 | #define CS_BRACE 2 | |
458 | #define CS_UNKNOWN 3 | |
459 | ||
460 | #define CONF_BEGIN(sc, prefix, desc) do { \ | |
461 | scanner *_conf_sc = (sc); \ | |
462 | const char *_conf_desc = (desc); \ | |
463 | int _conf_state = CS_PLAIN; \ | |
464 | \ | |
465 | /* --- Read the initial prefix --- */ \ | |
466 | \ | |
467 | if (_conf_sc->t == CTOK_WORD && \ | |
468 | strcmp(_conf_sc->d.buf, (prefix)) == 0) { \ | |
469 | token(_conf_sc); \ | |
470 | _conf_state = CS_PREFIX; \ | |
471 | if (_conf_sc->t == '.') \ | |
472 | token(_conf_sc); \ | |
473 | else if (_conf_sc->t == '{') { \ | |
474 | token(_conf_sc); \ | |
475 | _conf_state = CS_BRACE; \ | |
476 | } \ | |
477 | } \ | |
478 | \ | |
479 | /* --- Ensure the next token is a word --- */ \ | |
480 | \ | |
481 | if (_conf_sc->t != CTOK_WORD) \ | |
482 | error(_conf_sc, "parse error, expected option keyword"); \ | |
483 | do { | |
484 | ||
485 | #define CONF_END \ | |
486 | \ | |
487 | /* --- Reject an option --- * \ | |
488 | * \ | |
489 | * We could get here as a result of an explicit @CONF_REJECT@ or \ | |
490 | * because the option wasn't accepted. \ | |
491 | */ \ | |
492 | \ | |
493 | goto _conf_reject; \ | |
494 | _conf_reject: \ | |
495 | if (_conf_state == CS_PLAIN) \ | |
496 | _conf_state = CS_UNKNOWN; \ | |
497 | else { \ | |
498 | error(_conf_sc, "unknown %s option `%s'", \ | |
499 | _conf_desc, _conf_sc->d.buf); \ | |
500 | } \ | |
501 | \ | |
502 | /* --- Accept an option --- * \ | |
503 | * \ | |
504 | * It's safe to drop through from above. Either an error will have \ | |
505 | * been reported, or the state is not @CS_BRACE@. \ | |
506 | */ \ | |
507 | \ | |
508 | _conf_accept: \ | |
509 | if (_conf_state == CS_BRACE && _conf_sc->t == ';') \ | |
510 | token(_conf_sc); \ | |
511 | } while (_conf_state == CS_BRACE && _conf_sc->t == CTOK_WORD); \ | |
512 | \ | |
513 | /* --- Check for a closing brace --- */ \ | |
514 | \ | |
515 | if (_conf_state == CS_BRACE) { \ | |
516 | if (_conf_sc->t == '}') \ | |
517 | token(_conf_sc); \ | |
518 | else \ | |
519 | error(_conf_sc, "parse error, expected `}'"); \ | |
520 | } \ | |
521 | \ | |
522 | /* --- Return an appropriate value --- */ \ | |
523 | \ | |
524 | return (_conf_state != CS_UNKNOWN); \ | |
525 | } while (0) | |
526 | ||
527 | /* --- @CONF_ACCEPT@, @CONF_REJECT@ --- * | |
528 | * | |
529 | * Arguments: --- | |
530 | * | |
531 | * Use: Within an options parser (between @CONF_BEGIN@ and | |
532 | * @CONF_END@), accept or reject an option. | |
533 | */ | |
534 | ||
535 | #define CONF_ACCEPT goto _conf_accept | |
536 | #define CONF_REJECT goto _conf_reject | |
537 | ||
538 | /* --- @CONF_QUAL@ --- * | |
539 | * | |
540 | * Arguments: --- | |
541 | * | |
542 | * Use: Evaluates to a nonzero value if the current option is | |
543 | * qualified. This can be used to decide whether abbreviations | |
544 | * for options should be accepted. | |
545 | */ | |
546 | ||
547 | #define CONF_QUAL (_conf_state != CS_PLAIN) | |
548 | ||
549 | /* --- @conf_name@ --- * | |
550 | * | |
551 | * Arguments: @scanner *sc@ = pointer to scanner | |
552 | * @char delim@ = delimiter character to look for | |
553 | * @dstr *d@ = pointer to dynamic string for output | |
554 | * | |
555 | * Returns: --- | |
556 | * | |
557 | * Use: Reads in a compound name consisting of words separated by | |
558 | * delimiters. Leading and trailing delimiters are permitted, | |
559 | * although they'll probably cause confusion if used. The name | |
560 | * may be enclosed in square brackets if that helps at all. | |
561 | * | |
562 | * Examples of compound names are filenames (delimited by `/') | |
563 | * and IP addresses (delimited by `.'). | |
564 | */ | |
565 | ||
566 | extern void conf_name(scanner */*sc*/, char /*delim*/, dstr */*d*/); | |
567 | ||
35a142ca MW |
568 | /* --- @conf_fname@ --- * |
569 | * | |
570 | * Arguments: @scanner *sc@ = pointer to scanner | |
571 | * @dstr *d@ = pointer to dynamic string for output | |
572 | * | |
573 | * Returns: --- | |
574 | * | |
575 | * Use: Reads a file name from the input and stores it in @d@. | |
576 | */ | |
577 | ||
578 | extern void conf_fname(scanner */*sc*/, dstr */*d*/); | |
579 | ||
47a7631f MW |
580 | /*----- Reference-counted file descriptors --------------------------------*/ |
581 | ||
582 | typedef struct reffd { | |
583 | int fd; | |
584 | unsigned ref; | |
585 | void (*proc)(void */*p*/); | |
586 | void *p; | |
587 | } reffd; | |
588 | ||
589 | /* --- @reffd_init@ --- * | |
590 | * | |
591 | * Arguments: @int fd@ = file descriptor | |
592 | * | |
593 | * Returns: Reference-counted file descriptor object. | |
594 | * | |
595 | * Use: Creates a refcounted file descriptor. | |
596 | */ | |
597 | ||
598 | extern reffd *reffd_init(int /*fd*/); | |
599 | ||
600 | /* --- @reffd_handler@ --- * | |
601 | * | |
602 | * Arguments: @reffd *r@ = pointer to reference counted filehandle | |
603 | * @void (*proc)(void *p)@ = procedure to call | |
604 | * @void *p@ | |
605 | * | |
606 | * Returns: --- | |
607 | * | |
608 | * Use: Sets the reference counted file descriptor to call @proc@ | |
609 | * when it is no longer required. | |
610 | */ | |
611 | ||
612 | extern void reffd_handler(reffd */*r*/, void (*/*proc*/)(void */*p*/), | |
613 | void */*p*/); | |
614 | ||
615 | /* --- @reffd_inc@ --- * | |
616 | * | |
617 | * Arguments: @reffd *r@ = pointer to reference counted filehandle | |
618 | * | |
619 | * Returns: --- | |
620 | * | |
621 | * Use: Increments the reference count for a file descriptor. | |
622 | */ | |
623 | ||
624 | #define REFFD_INC(r) do { (r)->ref++; } while (0) | |
625 | ||
626 | extern void reffd_inc(reffd */*r*/); | |
627 | ||
628 | /* --- @reffd_dec@ --- * | |
629 | * | |
630 | * Arguments: @reffd *r@ = pointer to reference counted filehandle | |
631 | * | |
632 | * Returns: --- | |
633 | * | |
634 | * Use: Decrements the reference count for a file descriptor. | |
635 | */ | |
636 | ||
637 | #define REFFD_DEC(r) do { \ | |
638 | reffd *_r = (r); \ | |
639 | _r->ref--; \ | |
640 | if (_r->ref == 0) { \ | |
641 | close(_r->fd); \ | |
642 | if (_r->proc) \ | |
643 | _r->proc(_r->p); \ | |
644 | DESTROY(_r); \ | |
645 | } \ | |
646 | } while (0) | |
647 | ||
648 | extern void reffd_dec(reffd */*r*/); | |
649 | ||
650 | /*----- Sources, targets and endpoints ------------------------------------*/ | |
651 | ||
652 | /* --- Basic endpoint structure --- */ | |
653 | ||
654 | typedef struct endpt { | |
655 | struct endpt_ops *ops; /* Pointer to operations table */ | |
656 | struct endpt *other; /* Pointer to sibling endpoint */ | |
657 | unsigned f; /* Various flags */ | |
658 | struct tango *t; /* Private data structure */ | |
659 | reffd *in, *out; /* File descriptors */ | |
660 | } endpt; | |
661 | ||
662 | /* --- Endpoint flags --- */ | |
663 | ||
664 | #define EPF_PENDING 1u /* Endpoint creation in progress */ | |
665 | #define EPF_FILE 2u /* Endpoint smells like a file */ | |
666 | ||
667 | /* --- Endpoint operations table --- */ | |
668 | ||
669 | typedef struct endpt_ops { | |
670 | ||
671 | /* --- @attach@ --- * | |
672 | * | |
673 | * Arguments: @endpt *e@ = pointer to endpoint to be attached | |
674 | * @reffd *in, *out@ = input and output file descriptors | |
675 | * | |
676 | * Returns: --- | |
677 | * | |
678 | * Use: Instructs a non-file endpoint to attach itself to a pair of | |
679 | * files. | |
680 | */ | |
681 | ||
682 | void (*attach)(endpt */*e*/, reffd */*in*/, reffd */*out*/); | |
683 | ||
684 | /* --- @file@ --- * | |
685 | * | |
686 | * Arguments: @endpt *e@ = pointer to endpoint in question | |
687 | * @endpt *f@ = pointer to a file endpoint | |
688 | * | |
689 | * Returns: --- | |
690 | * | |
691 | * Use: Informs a non-file endpoint of a file endpoint which will | |
692 | * want to be closed when it's finished with. At that time, the | |
693 | * endpoint should arrange to have both itself and its partner | |
694 | * closed. If no file is registered, the endpoint manager will | |
695 | * close both endpoints itself. | |
696 | */ | |
697 | ||
698 | void (*file)(endpt */*e*/, endpt */*f*/); | |
699 | ||
700 | /* --- @wclose@ --- * | |
701 | * | |
702 | * Arguments: @endpt *e@ = endpoint to be partially closed | |
703 | * | |
704 | * Returns: --- | |
705 | * | |
706 | * Use: Announces that the endpoint will not be written to any more. | |
707 | */ | |
708 | ||
709 | void (*wclose)(endpt */*e*/); | |
710 | ||
711 | /* --- @close@ --- * | |
712 | * | |
713 | * Arguments: @endpt *e@ = endpoint to be closed | |
714 | * | |
715 | * Returns: --- | |
716 | * | |
717 | * Use: Completely closes an endpoint. The endpoint's data may be | |
718 | * freed, although some endpoints may wish to delay freeing for | |
719 | * some reason. | |
720 | */ | |
721 | ||
722 | void (*close)(endpt */*e*/); | |
723 | ||
724 | } endpt_ops; | |
725 | ||
726 | /* --- A basic target object --- */ | |
727 | ||
728 | typedef struct target { | |
729 | struct target_ops *ops; | |
730 | char *desc; | |
731 | } target; | |
732 | ||
733 | /* --- Forwarding target operations --- */ | |
734 | ||
735 | typedef struct target_ops { | |
736 | const char *name; /* Name of this target */ | |
737 | ||
738 | /* --- @option@ --- * | |
739 | * | |
740 | * Arguments: @target *t@ = pointer to target object, or zero if global | |
741 | * @scanner *sc@ = scanner to read from | |
742 | * | |
743 | * Returns: Nonzero to claim the option. | |
744 | * | |
745 | * Use: Handles an option string from the configuration file. | |
746 | */ | |
747 | ||
748 | int (*option)(target */*t*/, scanner */*sc*/); | |
749 | ||
750 | /* --- @read@ --- * | |
751 | * | |
752 | * Arguments: @scanner *sc@ = pointer to scanner to read from | |
753 | * | |
754 | * Returns: Pointer to a target object to claim, null to reject. | |
755 | * | |
756 | * Use: Parses a target description from the configuration file. | |
757 | * Only the socket target is allowed to omit the prefix on a | |
758 | * target specification. | |
759 | */ | |
760 | ||
761 | target *(*read)(scanner */*sc*/); | |
762 | ||
763 | /* --- @confirm@ --- * | |
764 | * | |
765 | * Arguments: @target *t@ = pointer to target | |
766 | * | |
767 | * Returns: --- | |
768 | * | |
769 | * Use: Confirms configuration of a target. | |
770 | */ | |
771 | ||
772 | void (*confirm)(target */*t*/); | |
773 | ||
774 | /* --- @create@ --- * | |
775 | * | |
776 | * Arguments: @target *t@ = pointer to target | |
777 | * @const char *desc@ = description of connection | |
778 | * | |
779 | * Returns: Pointer to a created endpoint. | |
780 | * | |
781 | * Use: Generates a target endpoint for communication. | |
782 | */ | |
783 | ||
784 | endpt *(*create)(target */*t*/, const char */*desc*/); | |
785 | ||
786 | /* --- @destroy@ --- * | |
787 | * | |
788 | * Arguments: @target *t@ = pointer to target | |
789 | * | |
790 | * Returns: --- | |
791 | * | |
792 | * Use: Destroys a target. | |
793 | */ | |
794 | ||
795 | void (*destroy)(target */*t*/); | |
796 | ||
797 | } target_ops; | |
798 | ||
799 | /* --- A basic source object --- */ | |
800 | ||
801 | typedef struct source { | |
802 | struct source *next, *prev; | |
803 | struct source_ops *ops; | |
804 | char *desc; | |
805 | } source; | |
806 | ||
807 | /* --- Forwarding source operations --- */ | |
808 | ||
809 | typedef struct source_ops { | |
810 | const char *name; /* Name of this source */ | |
811 | ||
812 | /* --- @option@ --- * | |
813 | * | |
814 | * Arguments: @scanner *sc@ = scanner to read from | |
815 | * @source *s@ = pointer to source object, or zero if global | |
816 | * | |
817 | * Returns: Nonzero to claim the option. | |
818 | * | |
819 | * Use: Handles an option string from the configuration file. | |
820 | */ | |
821 | ||
822 | int (*option)(source */*s*/, scanner */*sc*/); | |
823 | ||
824 | /* --- @read@ --- * | |
825 | * | |
826 | * Arguments: @scanner *sc@ = pointer to scanner to read from | |
827 | * | |
828 | * Returns: Pointer to a source object to claim, null to reject. | |
829 | * | |
830 | * Use: Parses a source description from the configuration file. | |
831 | * Only the socket source is allowed to omit the prefix on a | |
832 | * source specification. | |
833 | */ | |
834 | ||
835 | source *(*read)(scanner */*sc*/); | |
836 | ||
837 | /* --- @attach@ --- * | |
838 | * | |
839 | * Arguments: @source *s@ = pointer to source | |
840 | * @scanner *sc@ = scanner (for error reporting) | |
841 | * @target *t@ = pointer to target to attach | |
842 | * | |
843 | * Returns: --- | |
844 | * | |
845 | * Use: Attaches a target to a source. | |
846 | */ | |
847 | ||
848 | void (*attach)(source */*s*/, scanner */*sc*/, target */*t*/); | |
849 | ||
850 | /* --- @destroy@ --- * | |
851 | * | |
852 | * Arguments: @source *s@ = pointer to source | |
853 | * | |
854 | * Returns: --- | |
855 | * | |
856 | * Use: Destroys a source. Used when closing the system down, for | |
857 | * example as a result of a signal. | |
858 | */ | |
859 | ||
860 | void (*destroy)(source */*s*/); | |
861 | ||
862 | } source_ops; | |
863 | ||
864 | /* --- @endpt_kill@ --- * | |
865 | * | |
866 | * Arguments: @endpt *a@ = an endpoint | |
867 | * | |
868 | * Returns: --- | |
869 | * | |
870 | * Use: Kills an endpoint. If the endpoint is joined to another, the | |
871 | * other endpoint is also killed, as is the connection between | |
872 | * them (and that's the tricky bit). | |
873 | */ | |
874 | ||
875 | extern void endpt_kill(endpt */*a*/); | |
876 | ||
877 | /* --- @endpt_killall@ --- * | |
878 | * | |
879 | * Arguments: --- | |
880 | * | |
881 | * Returns: --- | |
882 | * | |
883 | * Use: Destroys all current endpoint connections. Used when | |
884 | * shutting down. | |
885 | */ | |
886 | ||
887 | extern void endpt_killall(void); | |
888 | ||
889 | /* --- @endpt_join@ --- * | |
890 | * | |
891 | * Arguments: @endpt *a@ = pointer to first endpoint | |
892 | * @endpt *b@ = pointer to second endpoint | |
893 | * | |
894 | * Returns: --- | |
895 | * | |
896 | * Use: Joins two endpoints together. | |
897 | */ | |
898 | ||
899 | extern void endpt_join(endpt */*a*/, endpt */*b*/); | |
900 | ||
901 | /* --- @source_add@ --- * | |
902 | * | |
903 | * Arguments: @source *s@ = pointer to a source | |
904 | * | |
905 | * Returns: --- | |
906 | * | |
907 | * Use: Adds a source to the master list. Only do this for passive | |
908 | * sources (e.g., listening sockets), not active sources (e.g., | |
909 | * executable programs). | |
910 | */ | |
911 | ||
912 | extern void source_add(source */*s*/); | |
913 | ||
914 | /* --- @source_remove@ --- * | |
915 | * | |
916 | * Arguments: @source *s@ = pointer to a source | |
917 | * | |
918 | * Returns: --- | |
919 | * | |
920 | * Use: Removes a source from the master list. | |
921 | */ | |
922 | ||
923 | extern void source_remove(source */*s*/); | |
924 | ||
925 | /* --- @source_killall@ --- * | |
926 | * | |
927 | * Arguments: --- | |
928 | * | |
929 | * Returns: --- | |
930 | * | |
931 | * Use: Frees all sources. | |
932 | */ | |
933 | ||
934 | extern void source_killall(void); | |
935 | ||
936 | /*----- The exec source and target ----------------------------------------*/ | |
937 | ||
938 | extern source_ops xsource_ops; | |
939 | extern target_ops xtarget_ops; | |
940 | ||
941 | /* --- @exec_init@ --- * | |
942 | * | |
943 | * Arguments: --- | |
944 | * | |
945 | * Returns: --- | |
946 | * | |
947 | * Use: Initializes the executable problem source and target. | |
948 | */ | |
949 | ||
950 | extern void exec_init(void); | |
951 | ||
952 | /*----- The file source and target ----------------------------------------*/ | |
953 | ||
954 | extern source_ops fsource_ops; | |
955 | extern target_ops ftarget_ops; | |
956 | ||
957 | /*----- The socket source and target --------------------------------------*/ | |
958 | ||
959 | extern source_ops ssource_ops; | |
960 | extern target_ops starget_ops; | |
961 | ||
962 | /* --- @starget_connected@ --- * | |
963 | * | |
964 | * Arguments: @int fd@ = file descriptor now ready for use | |
965 | * @void *p@ = pointer to an endpoint structure | |
966 | * | |
967 | * Returns: --- | |
968 | * | |
969 | * Use: Handles successful connection of the target endpoint. | |
970 | */ | |
971 | ||
972 | extern void starget_connected(int /*fd*/, void */*p*/); | |
973 | ||
974 | /*----- Handling of file attributes ---------------------------------------*/ | |
975 | ||
976 | /* --- File attribute options structure --- */ | |
977 | ||
978 | typedef struct fattr { | |
979 | unsigned mode; | |
980 | uid_t uid; | |
981 | gid_t gid; | |
982 | } fattr; | |
983 | ||
984 | /* --- Shared global options --- */ | |
985 | ||
986 | extern fattr fattr_global; | |
987 | ||
988 | /* --- @fattr_init@ --- * | |
989 | * | |
990 | * Arguments: @fattr *f@ = pointer to file attributes | |
991 | * | |
992 | * Returns: --- | |
993 | * | |
994 | * Use: Initializes a set of file attributes to default values. | |
995 | */ | |
996 | ||
997 | extern void fattr_init(fattr */*f*/); | |
998 | ||
999 | /* --- @fattr_option@ --- * | |
1000 | * | |
1001 | * Arguments: @scanner *sc@ = pointer to scanner to read | |
1002 | * @fattr *f@ = pointer to file attributes to set | |
1003 | * | |
1004 | * Returns: Whether the option was clamed. | |
1005 | * | |
1006 | * Use: Reads file attributes from a scanner. | |
1007 | */ | |
1008 | ||
1009 | extern int fattr_option(scanner */*sc*/, fattr */*f*/); | |
1010 | ||
1011 | /* --- @fattr_apply@ --- * | |
1012 | * | |
1013 | * Arguments: @const char *file@ = pointer to filename | |
1014 | * @fattr *f@ = pointer to attribute set | |
1015 | * | |
1016 | * Returns: @-1@ if it failed. | |
1017 | * | |
1018 | * Use: Applies file attributes to a file. For best results, try to | |
1019 | * create the file with the right permissions and so on. This | |
1020 | * call will fix everything up, but there are potential races | |
1021 | * which might catch you out if you're not careful. | |
1022 | */ | |
1023 | ||
1024 | extern int fattr_apply(const char */*file*/, fattr */*f*/); | |
1025 | ||
1026 | /*----- Making privileged connections -------------------------------------*/ | |
1027 | ||
1028 | /* --- @privconn_split@ --- * | |
1029 | * | |
1030 | * Arguments: @sel_state *s@ = select state | |
1031 | * | |
1032 | * Returns: --- | |
1033 | * | |
1034 | * Use: Splits off the privileged binding code into a separate | |
1035 | * process. | |
1036 | */ | |
1037 | ||
1038 | extern void privconn_split(sel_state */*s*/); | |
1039 | ||
1040 | /* --- @privconn_adddest@ --- * | |
1041 | * | |
1042 | * Arguments: @struct in_addr peer@ = address to connect to | |
1043 | * @unsigned port@ = port to connect to | |
1044 | * | |
1045 | * Returns: Index for this destination address, or @-1@ if not | |
1046 | * available. | |
1047 | * | |
1048 | * Use: Adds a valid destination for a privileged connection. | |
1049 | */ | |
1050 | ||
1051 | extern int privconn_adddest(struct in_addr /*peer*/, unsigned /*port*/); | |
1052 | ||
1053 | /* --- @privconn_connect@ --- * | |
1054 | * | |
1055 | * Arguments: @conn *c@ = connection structure to fill in | |
1056 | * @sel_state *s@ = pointer to select state to attach to | |
1057 | * @int i@ = address index to connect to | |
1058 | * @struct in_addr bind@ = address to bind to | |
1059 | * @void (*func)(int, void *)@ = function to call on connect | |
1060 | * @void *p@ = argument for the function | |
1061 | * | |
1062 | * Returns: Zero on success, @-1@ on failure. | |
1063 | * | |
1064 | * Use: Sets up a privileged connection job. | |
1065 | */ | |
1066 | ||
1067 | extern int privconn_connect(conn */*c*/, sel_state */*s*/, | |
1068 | int /*i*/, struct in_addr /*bind*/, | |
1069 | void (*/*func*/)(int, void *), void */*p*/); | |
1070 | ||
1071 | /*----- Identifying remote clients ----------------------------------------*/ | |
1072 | ||
1073 | typedef struct id_req { | |
1074 | struct sockaddr_in lsin; /* Local address of connection */ | |
1075 | struct sockaddr_in rsin; /* Remote address of connection */ | |
1076 | const char *desc; /* Description of connection */ | |
1077 | const char *act; /* Action taken by server */ | |
1078 | reffd *r; /* Pointer to file descriptor */ | |
1079 | } id_req; | |
1080 | ||
1081 | /* --- @identify@ --- * | |
1082 | * | |
1083 | * Arguments: @const id_req *q@ = pointer to request block | |
1084 | * | |
1085 | * Returns: --- | |
1086 | * | |
1087 | * Use: Starts a background ident lookup and reverse-resolve job | |
1088 | * which will, eventually, report a message to the system log. | |
1089 | */ | |
1090 | ||
1091 | extern void identify(const id_req */*q*/); | |
1092 | ||
1093 | /*----- Host-based access control -----------------------------------------*/ | |
1094 | ||
1095 | /* --- An access control entry --- */ | |
1096 | ||
1097 | typedef struct acl_entry { | |
1098 | struct acl_entry *next; /* Next entry in the list */ | |
1099 | const struct acl_ops *ops; /* Operations for the ACL entry */ | |
1100 | unsigned act; /* What to do with matching hosts */ | |
1101 | } acl_entry; | |
1102 | ||
1103 | #define ACL_DENY 0 /* Deny access to matching conns */ | |
1104 | #define ACL_ALLOW 1 /* Allow access to matching conns */ | |
1105 | #define ACL_PERM 1u /* Bit mask for permission bit */ | |
1106 | ||
1107 | /* --- Host-based access control --- */ | |
1108 | ||
1109 | typedef struct acl_host { | |
1110 | acl_entry a; /* Base structure */ | |
1111 | struct in_addr addr, mask; /* Address and netmask */ | |
1112 | } acl_host; | |
1113 | ||
1114 | /* --- ACL methods --- */ | |
1115 | ||
1116 | typedef struct acl_ops { | |
1117 | int (*check)(void */*a*/, struct in_addr /*addr*/, unsigned /*port*/); | |
1118 | void (*dump)(void */*a*/, FILE */*fp*/); | |
1119 | void (*free)(void */*a*/); | |
1120 | } acl_ops; | |
1121 | ||
1122 | /* --- @acl_check@ --- * | |
1123 | * | |
1124 | * Arguments: @acl_entry *a@ = pointer to ACL to check against | |
1125 | * @struct in_addr addr@ = address to check | |
1126 | * @unsigned port@ = port number to check | |
1127 | * @int *act@ = verdict (should initially be @ACT_ALLOW@) | |
1128 | * | |
1129 | * Returns: Zero if undecided, nonzero if a rule matched. | |
1130 | * | |
1131 | * Use: Checks an address against an ACL. | |
1132 | */ | |
1133 | ||
1134 | extern int acl_check(acl_entry */*a*/, | |
1135 | struct in_addr /*addr*/, unsigned /*port*/, | |
1136 | int */*act*/); | |
1137 | ||
1138 | /* --- @acl_dump@ --- * | |
1139 | * | |
1140 | * Arguments: @acl_entry *a@ = pointer to ACL to dump | |
1141 | * @FILE *fp@ = pointer to stream to dump on | |
1142 | * | |
1143 | * Returns: --- | |
1144 | * | |
1145 | * Use: Dumps an access control list to an output stream. | |
1146 | */ | |
1147 | ||
1148 | extern void acl_dump(acl_entry */*a*/, FILE */*fp*/); | |
1149 | ||
1150 | /* --- @acl_free@ --- * | |
1151 | * | |
1152 | * Arguments: @acl_entry *a@ = pointer to a list of ACLs | |
1153 | * | |
1154 | * Returns: --- | |
1155 | * | |
1156 | * Use: Frees all of the memory used by an ACL. | |
1157 | */ | |
1158 | ||
1159 | extern void acl_free(acl_entry */*a*/); | |
1160 | ||
1161 | /* --- @acl_addhost@ --- * | |
1162 | * | |
1163 | * Arguments: @acl_entry ***a@ = address of pointer to list tail | |
1164 | * @unsigned act@ = what to do with matching addresses | |
1165 | * @struct in_addr addr, mask@ = address and mask to match | |
1166 | * | |
1167 | * Returns: --- | |
1168 | * | |
1169 | * Use: Adds a host-authentication entry to the end of an access | |
1170 | * control list. | |
1171 | */ | |
1172 | ||
1173 | extern void acl_addhost(acl_entry ***/*a*/, unsigned /*act*/, | |
1174 | struct in_addr /*addr*/, struct in_addr /*mask*/); | |
1175 | ||
1176 | /* --- @acl_addpriv@ --- * | |
1177 | * | |
1178 | * Arguments: @acl_entry ***a@ = address of pointer to list tail | |
1179 | * @unsigned act@ = what to do with matching addresses | |
1180 | * | |
1181 | * Returns: --- | |
1182 | * | |
1183 | * Use: Adds a privileged-port check to the end of an access control | |
1184 | * list. | |
1185 | */ | |
1186 | ||
1187 | extern void acl_addpriv(acl_entry ***/*a*/, unsigned /*act*/); | |
1188 | ||
1189 | /*----- Network addresses -------------------------------------------------*/ | |
1190 | ||
1191 | /* --- A generic socket address --- * | |
1192 | * | |
1193 | * Not all systems understand @sa_len@ fields. (In particular, Linux | |
1194 | * doesn't.) Some fairly ugly hacking is then performed on particular | |
1195 | * address types. | |
1196 | */ | |
1197 | ||
1198 | typedef struct addr { | |
1199 | struct addr_ops *ops; | |
1200 | size_t sz; | |
1201 | } addr; | |
1202 | ||
1203 | #define ADDRSZ(sz) (sizeof(addr) + (sz)) | |
1204 | ||
1205 | /* --- Address configuration --- * | |
1206 | * | |
1207 | * An address family will want to extend this. | |
1208 | */ | |
1209 | ||
1210 | typedef struct addr_opts { | |
1211 | unsigned f; | |
1212 | } addr_opts; | |
1213 | ||
1214 | #define ADDRF_NOLOG 1u | |
1215 | ||
1216 | /* --- Address types --- * | |
1217 | * | |
1218 | * For things like Internet addresses, source and destinations look | |
1219 | * different. | |
1220 | */ | |
1221 | ||
1222 | enum { | |
1223 | ADDR_SRC, | |
1224 | ADDR_DEST, | |
1225 | ADDR_GLOBAL | |
1226 | }; | |
1227 | ||
1228 | /* --- Description of an address type handler --- */ | |
1229 | ||
1230 | typedef struct addr_ops { | |
1231 | const char *name; /* Protocol's internal name */ | |
1232 | ||
1233 | /* --- @read@ --- * | |
1234 | * | |
1235 | * Arguments: @scanner *sc@ = pointer to scanner to read from | |
1236 | * @unsigned type@ = type of address to be read | |
1237 | * | |
1238 | * Returns: A filled-in socket address. | |
1239 | * | |
1240 | * Use: Parses a textual representation of a socket address. | |
1241 | */ | |
1242 | ||
1243 | addr *(*read)(scanner */*sc*/, unsigned /*type*/); | |
1244 | ||
1245 | /* --- @destroy@ --- * | |
1246 | * | |
1247 | * Arguments: @addr *a@ = pointer to an address block | |
1248 | * | |
1249 | * Returns: --- | |
1250 | * | |
1251 | * Use: Disposes of an address block in some suitable fashion. | |
1252 | */ | |
1253 | ||
1254 | void (*destroy)(addr */*a*/); | |
1255 | ||
1256 | /* --- @print@ --- * | |
1257 | * | |
1258 | * Arguments: @addr *a@ = pointer to socket address to read | |
1259 | * @unsigned type@ = type of address to be written | |
1260 | * @dstr *d@ = string on which to write the description | |
1261 | * | |
1262 | * Returns: --- | |
1263 | * | |
1264 | * Use: Writes a textual representation of a socket address to | |
1265 | * a string. | |
1266 | */ | |
1267 | ||
1268 | void (*print)(addr */*a*/, unsigned /*type*/, dstr */*d*/); | |
1269 | ||
1270 | /* --- @initsrcopts@ --- * | |
1271 | * | |
1272 | * Arguments: --- | |
1273 | * | |
1274 | * Returns: A pointer to a protocol-specific data block for a listener | |
1275 | * | |
1276 | * Use: Creates a data block for a listener. This is attached to the | |
1277 | * listener data structure. Options can then be requested, and | |
1278 | * are added to the block when necessary. | |
1279 | */ | |
1280 | ||
1281 | addr_opts *(*initsrcopts)(void); | |
1282 | ||
1283 | /* --- @option@ --- * | |
1284 | * | |
1285 | * Arguments: @scanner *sc@ = pointer to a scanner to read from | |
1286 | * @unsigned type@ = kind of option this is | |
1287 | * @addr_opts *ao@ = data block to modify (from @init@), or null | |
1288 | * | |
1289 | * Returns: Nonzero to claim the option. | |
1290 | * | |
1291 | * Use: Parses a source option, either global or listener-specific. | |
1292 | */ | |
1293 | ||
1294 | int (*option)(scanner */*sc*/, addr_opts */*ao*/, unsigned /*type*/); | |
1295 | ||
1296 | /* --- @confirm@ --- * | |
1297 | * | |
1298 | * Arguments: @addr *a@ = pointer to an address structure | |
1299 | * @unsigned type@ = kind of address this is | |
1300 | * @addr_opts *ao@ = address options | |
1301 | * | |
1302 | * Returns: --- | |
1303 | * | |
1304 | * Use: Called during initialization when an address is fully | |
1305 | * configured. | |
1306 | */ | |
1307 | ||
1308 | void (*confirm)(addr */*a*/, unsigned /*type*/, addr_opts */*ao*/); | |
1309 | ||
1310 | /* --- @freesrcopts@ --- * | |
1311 | * | |
1312 | * Arguments: @addr_opts *ao@ = data block to remove | |
1313 | * | |
1314 | * Returns: --- | |
1315 | * | |
1316 | * Use: Throws away all the configuration data for an address type. | |
1317 | */ | |
1318 | ||
1319 | void (*freesrcopts)(addr_opts */*ao*/); | |
1320 | ||
1321 | /* --- @bind@ --- * | |
1322 | * | |
1323 | * Arguments: @addr *a@ = the address to bind to | |
1324 | * @addr_opts *ao@ = the address options | |
1325 | * | |
1326 | * Returns: File descriptor of bound socket if OK, or @-1@ on error. | |
1327 | * | |
1328 | * Use: Binds a listening socket. The tedious stuff with @listen@ | |
1329 | * isn't necessary. | |
1330 | */ | |
1331 | ||
1332 | int (*bind)(addr */*a*/, addr_opts */*ao*/); | |
1333 | ||
1334 | /* --- @unbind@ --- * | |
1335 | * | |
1336 | * Arguments: @addr *a@ = pointer to an address | |
1337 | * | |
1338 | * Returns: --- | |
1339 | * | |
1340 | * Use: Unbinds an address. This is used when tidying up. The main | |
1341 | * purpose is to let the Unix-domain handler remove its socket | |
1342 | * node from the filesystem. | |
1343 | */ | |
1344 | ||
1345 | void (*unbind)(addr */*a*/); | |
1346 | ||
1347 | /* --- @accept@ --- * | |
1348 | * | |
1349 | * Arguments: @int fd@ = listening file descriptor | |
1350 | * @addr_opts *ao@ = data block to get configuration from | |
1351 | * @const char *desc@ = description of the listener | |
1352 | * | |
1353 | * Returns: Pointer to a reference counted file descriptor. | |
1354 | * | |
1355 | * Use: Accepts, verifies and logs an incoming connection. | |
1356 | */ | |
1357 | ||
1358 | reffd *(*accept)(int /*fd*/, addr_opts */*ao*/, const char */*desc*/); | |
1359 | ||
1360 | /* --- @inittargopts@ --- * | |
1361 | * | |
1362 | * Arguments: --- | |
1363 | * | |
1364 | * Returns: A pointer to a protocol-specific data block for a connecter | |
1365 | * | |
1366 | * Use: Creates a data block for a target. This is attached to the | |
1367 | * target data structure. Options can then be requested, and | |
1368 | * are added to the block when necessary. | |
1369 | */ | |
1370 | ||
1371 | addr_opts *(*inittargopts)(void); | |
1372 | ||
1373 | /* --- @freetargopts@ --- * | |
1374 | * | |
1375 | * Arguments: @addr_opts *ao@ = data block to remove | |
1376 | * | |
1377 | * Returns: --- | |
1378 | * | |
1379 | * Use: Throws away all the configuration data for an address type. | |
1380 | */ | |
1381 | ||
1382 | void (*freetargopts)(addr_opts */*ao*/); | |
1383 | ||
1384 | /* --- @connect@ --- * | |
1385 | * | |
1386 | * Arguments: @addr *a@ = destination address | |
1387 | * @addr_opts *ao@ = target address options | |
1388 | * @conn *c@ = connection structure | |
1389 | * @endpt *e@ = endpoint structure | |
1390 | * | |
1391 | * Returns: Zero if OK, @-1@ on some error. | |
1392 | * | |
1393 | * Use: Requests that a connection be made, or at least set in | |
1394 | * motion. An address may do one of these things: | |
1395 | * | |
1396 | * * Return @-1@. | |
1397 | * | |
1398 | * * Call @starget_connected@ with @-1@ or a connected file | |
1399 | * descriptor and the pointer @e@. | |
1400 | * | |
1401 | * * Call @conn_init@ or @conn_fd@, giving @starget_connected@ | |
1402 | * and @e@ as the function to call. | |
1403 | */ | |
1404 | ||
1405 | int (*connect)(addr */*a*/, addr_opts */*ao*/, conn */*c*/, endpt */*e*/); | |
1406 | ||
1407 | } addr_ops; | |
1408 | ||
1409 | /* --- Address types --- */ | |
1410 | ||
1411 | extern addr_ops un_ops; | |
1412 | extern addr_ops inet_ops; | |
1413 | ||
e82f7154 | 1414 | /*----- That's all, folks -------------------------------------------------*/ |
1415 | ||
1416 | #ifdef __cplusplus | |
1417 | } | |
1418 | #endif | |
1419 | ||
1420 | #endif |