48bb1f76 |
1 | /* -*-c-*- |
2 | * |
372a98e2 |
3 | * $Id: socket.c,v 1.6 2001/02/03 20:30:03 mdw Exp $ |
48bb1f76 |
4 | * |
5 | * Socket source and target definitions |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
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: socket.c,v $ |
372a98e2 |
32 | * Revision 1.6 2001/02/03 20:30:03 mdw |
33 | * Support re-reading config files on SIGHUP. |
34 | * |
14865057 |
35 | * Revision 1.5 2000/03/23 23:20:42 mdw |
36 | * Remove listener even if connection option isn't SOCKOPT_LIMITED. |
37 | * |
20922c31 |
38 | * Revision 1.4 1999/12/22 15:44:25 mdw |
39 | * Fix log message. |
40 | * |
0fe44b09 |
41 | * Revision 1.3 1999/10/22 22:48:36 mdw |
42 | * New connection options: unlimited concurrent connections, and one-shot |
43 | * listening sockets. |
44 | * |
e0ce9d38 |
45 | * Revision 1.2 1999/07/27 18:30:53 mdw |
46 | * Various minor portability fixes. |
47 | * |
48bb1f76 |
48 | * Revision 1.1 1999/07/26 23:33:32 mdw |
49 | * New sources and targets. |
50 | * |
51 | */ |
52 | |
53 | /*----- Header files ------------------------------------------------------*/ |
54 | |
55 | #include "config.h" |
56 | |
57 | #include <ctype.h> |
58 | #include <errno.h> |
0fe44b09 |
59 | #include <limits.h> |
48bb1f76 |
60 | #include <stdio.h> |
61 | #include <stdlib.h> |
62 | #include <string.h> |
63 | |
e0ce9d38 |
64 | #include <sys/types.h> |
65 | #include <unistd.h> |
66 | |
48bb1f76 |
67 | #include <sys/socket.h> |
68 | #include <netinet/in.h> |
69 | #include <arpa/inet.h> |
70 | #include <netdb.h> |
71 | |
72 | #include <mLib/alloc.h> |
73 | #include <mLib/conn.h> |
74 | #include <mLib/dstr.h> |
75 | #include <mLib/fdflags.h> |
76 | #include <mLib/sel.h> |
77 | #include <mLib/sub.h> |
78 | |
79 | #include "addr.h" |
80 | #include "conf.h" |
81 | #include "endpt.h" |
82 | #include "fw.h" |
83 | #include "scan.h" |
84 | #include "socket.h" |
85 | #include "target.h" |
86 | |
87 | #include "inet.h" |
88 | #include "un.h" |
89 | |
90 | /*----- Data structures ---------------------------------------------------*/ |
91 | |
92 | /* --- Socket source options --- */ |
93 | |
94 | typedef struct ssource_opts { |
0fe44b09 |
95 | unsigned opt; |
48bb1f76 |
96 | unsigned conn; |
97 | } ssource_opts; |
98 | |
0fe44b09 |
99 | static ssource_opts ssgo = { 256, 0 }; |
100 | |
101 | #define SOCKOPT_LIMIT 0u |
102 | #define SOCKOPT_NOLIMIT 1u |
103 | #define SOCKOPT_ONESHOT 2u |
48bb1f76 |
104 | |
105 | /* --- Socket source --- */ |
106 | |
107 | typedef struct ssource { |
108 | source s; |
109 | addr *a; |
110 | target *t; |
111 | addr_opts *ao; |
112 | ssource_opts o; |
113 | sel_file r; |
114 | } ssource; |
115 | |
116 | /* --- Socket target --- */ |
117 | |
118 | typedef struct starget { |
119 | target t; |
120 | addr *a; |
121 | addr_opts *ao; |
122 | } starget; |
123 | |
124 | /* --- Socket target endpoint --- */ |
125 | |
126 | typedef struct stept { |
127 | endpt e; |
128 | conn c; |
372a98e2 |
129 | char *desc; |
48bb1f76 |
130 | } stept; |
131 | |
132 | /* --- Socket source endpoint --- */ |
133 | |
134 | typedef struct ssept { |
135 | endpt e; |
136 | ssource *s; |
137 | } ssept; |
138 | |
139 | #define SKF_CONN 16u |
140 | #define SKF_BROKEN 32u |
141 | |
142 | /*----- Protocol table ----------------------------------------------------*/ |
143 | |
144 | static addr_ops *addrs[] = { &inet_ops, &un_ops, 0 }; |
145 | |
146 | /*----- Other persistent variables ----------------------------------------*/ |
147 | |
148 | static addr_opts gao = { 0 }; |
149 | |
150 | /*----- Parsing address types ---------------------------------------------*/ |
151 | |
152 | /* --- @getaddrtype@ --- * |
153 | * |
154 | * Arguments: @scanner *sc@ = pointer to scanner (for error reporting) |
155 | * @const char *p@ = pointer to protocol name |
156 | * @int abbrev@ = nonzero to allow abbreviations |
157 | * |
158 | * Returns: Pointer to address operations table or null. |
159 | * |
160 | * Use: Looks up a protocol name. Handy when parsing addresses and |
161 | * other bits of configuration. Returns null if no matching |
162 | * address was found. |
163 | */ |
164 | |
165 | static addr_ops *getaddrtype(scanner *sc, const char *p, int abbrev) |
166 | { |
167 | addr_ops **ops; |
168 | addr_ops *chosen = 0; |
169 | size_t sz = strlen(p); |
170 | |
171 | for (ops = addrs; *ops; ops++) { |
172 | if (strncmp((*ops)->name, p, sz) == 0) { |
173 | if ((*ops)->name[sz] == 0) |
174 | return (*ops); |
175 | else if (chosen && abbrev) |
176 | error(sc, "ambiguous socket address type `%s'", p); |
177 | chosen = *ops; |
178 | } |
179 | } |
180 | if (!abbrev) |
181 | return (0); |
182 | return (chosen); |
183 | } |
184 | |
185 | /* --- @getaddr@ --- * |
186 | * |
187 | * Arguments: @scanner *sc@ = pointer to scanner to read from |
188 | * @unsigned type@ = address type (@ADDR_SRC@ or @ADDR_DEST@) |
189 | * |
190 | * Returns: Pointer to an address successfully read. |
191 | * |
192 | * Use: Reads an optionally qualified address. |
193 | */ |
194 | |
195 | static addr *getaddr(scanner *sc, unsigned type) |
196 | { |
197 | addr_ops *ops = 0; |
198 | int abbrev = 0; |
199 | |
200 | if (sc->t == ':') { |
201 | token(sc); |
202 | abbrev = 1; |
203 | } |
204 | if (sc->t == CTOK_WORD) |
205 | ops = getaddrtype(sc, sc->d.buf, abbrev); |
206 | if (ops) |
207 | token(sc); |
208 | else if (abbrev) |
209 | error(sc, "unknown socket address type `%s'", sc->d.buf); |
210 | else |
211 | ops = &inet_ops; |
212 | if (sc->t == ':') |
213 | token(sc); |
214 | |
215 | return (ops->read(sc, type)); |
216 | } |
217 | |
218 | /*----- Socket endpoints --------------------------------------------------*/ |
219 | |
220 | /* --- @wclose@ --- */ |
221 | |
222 | static void sept_wclose(endpt *e) |
223 | { |
224 | shutdown(e->out->fd, 1); |
225 | } |
226 | |
227 | /* --- @close@ (source) --- */ |
228 | |
229 | static void ss_listen(ssource */*ss*/); |
230 | |
231 | static void ssept_close(endpt *e) |
232 | { |
233 | ssept *ee = (ssept *)e; |
234 | |
0fe44b09 |
235 | if (ee->s->o.opt == SOCKOPT_LIMIT) { |
48bb1f76 |
236 | ee->s->o.conn++; |
0fe44b09 |
237 | if (ee->s->o.conn == 1) |
238 | ss_listen(ee->s); |
239 | } |
48bb1f76 |
240 | REFFD_DEC(ee->e.in); |
241 | REFFD_DEC(ee->e.out); |
242 | fw_dec(); |
243 | DESTROY(ee); |
244 | } |
245 | |
246 | /* --- @close@ (target) --- */ |
247 | |
248 | static void stept_close(endpt *e) |
249 | { |
250 | stept *ee = (stept *)e; |
251 | |
252 | if (ee->e.f & EPF_PENDING) { |
253 | if (ee->e.f & SKF_CONN) |
254 | conn_kill(&ee->c); |
255 | } else { |
256 | REFFD_DEC(ee->e.in); |
257 | REFFD_DEC(ee->e.out); |
258 | } |
259 | |
372a98e2 |
260 | free(ee->desc); |
48bb1f76 |
261 | fw_dec(); |
262 | DESTROY(ee); |
263 | } |
264 | |
265 | /* --- @stept_go@ --- * |
266 | * |
267 | * Arguments: @int fd@ = file descriptor now ready for use |
268 | * @void *p@ = pointer to an endpoint structure |
269 | * |
270 | * Returns: --- |
271 | * |
272 | * Use: Handles successful connection of the target endpoint. |
273 | */ |
274 | |
275 | static void stept_go(int fd, void *p) |
276 | { |
277 | stept *e = p; |
278 | |
279 | /* --- Complicated and subtle --- * |
280 | * |
281 | * This code interacts quite closely with @starget_create@, mainly through |
282 | * flags in the endpoint block. |
283 | * |
284 | * If the connection failed, I log a message (that's easy enough). The |
285 | * behaviour then depends on whether the endpoints have been joined yet. |
286 | * If not, I set @SKF_BROKEN@ and return, so that @starget_create@ can |
287 | * clean up the mess and return an immediate failure. If they have, I kill |
288 | * the connection and everything ought to work. |
289 | * |
290 | * If the connection worked, I clear @EPF_PENDING@ (as expected, because |
291 | * my endpoint is now ready), and @SKF_CONN@ (to let @starget_create@ know |
292 | * that the connection is already going). Then, only if this isn't the |
293 | * first attempt, I rejoin this endpoint to its partner. |
294 | */ |
295 | |
296 | if (fd == -1) { |
297 | fw_log(-1, "[%s] connection failed: %s", e->desc, strerror(errno)); |
298 | e->e.f &= ~SKF_CONN; |
299 | if (e->e.f & EPF_PENDING) |
300 | endpt_kill(&e->e); |
301 | else |
302 | e->e.f |= SKF_BROKEN; |
303 | } else { |
304 | reffd *r = reffd_init(fd); |
305 | REFFD_INC(r); |
306 | e->e.in = e->e.out = r; |
307 | e->e.f &= ~(EPF_PENDING | SKF_CONN); |
308 | if (e->e.other) |
309 | endpt_join(&e->e, e->e.other); |
310 | } |
311 | } |
312 | |
313 | /* --- Socket endpoint definition --- */ |
314 | |
315 | static endpt_ops ssept_ops = { |
0fe44b09 |
316 | 0, 0, sept_wclose, ssept_close |
48bb1f76 |
317 | }; |
318 | |
319 | static endpt_ops stept_ops = { |
0fe44b09 |
320 | 0, 0, sept_wclose, stept_close |
48bb1f76 |
321 | }; |
322 | |
323 | /*----- Source definition -------------------------------------------------*/ |
324 | |
325 | /* --- @option@ --- */ |
326 | |
327 | static int ssource_option(source *s, scanner *sc) |
328 | { |
329 | ssource *ss = (ssource *)s; |
330 | ssource_opts *sso = ss ? &ss->o : &ssgo; |
331 | |
332 | CONF_BEGIN(sc, "socket", "socket") |
333 | |
334 | /* --- Make sure the next token is a word --- */ |
335 | |
336 | if (sc->t != CTOK_WORD) |
337 | error(sc, "parse error, option keyword expected"); |
338 | |
339 | /* --- Handle options at this level --- */ |
340 | |
341 | if (strcmp(sc->d.buf, "conn") == 0) { |
342 | token(sc); |
343 | if (sc->t == '=') |
344 | token(sc); |
0fe44b09 |
345 | if (sc->t != CTOK_WORD) |
346 | error(sc, "parse error, expected `unlimited', `one-shot' or number"); |
347 | if (isdigit((unsigned char)sc->d.buf[0])) { |
348 | sso->conn = atoi(sc->d.buf); |
349 | if (sso->conn == 0) |
350 | error(sc, "argument of `conn' must be positive"); |
351 | sso->opt = SOCKOPT_LIMIT; |
352 | token(sc); |
353 | } else { |
354 | sso->conn = 0; |
355 | sso->opt = 1 + (1 & conf_enum(sc, |
356 | "unlimited,one-shot,infinite", |
357 | ENUM_ABBREV, "`conn' option")); |
358 | } |
48bb1f76 |
359 | CONF_ACCEPT; |
360 | } |
361 | |
362 | if (strcmp(sc->d.buf, "logging") == 0 || |
363 | strcmp(sc->d.buf, "log") == 0) { |
364 | addr_opts *ao = ss ? ss->ao : &gao; |
365 | token(sc); |
366 | if (sc->t == '=') |
367 | token(sc); |
368 | if (conf_enum(sc, "no,yes", ENUM_ABBREV, "logging status")) |
369 | ao->f &= ~ADDRF_NOLOG; |
370 | else |
371 | ao->f |= ADDRF_NOLOG; |
372 | CONF_ACCEPT; |
373 | } |
374 | |
375 | /* --- Pass the option around the various address types --- */ |
376 | |
377 | if (ss) { |
378 | if (ss->a->ops->option && ss->a->ops->option(sc, ss ? ss->ao : 0)) |
379 | CONF_ACCEPT; |
380 | } else { |
381 | addr_ops **a; |
382 | for (a = addrs; *a; a++) { |
383 | if ((*a)->option && (*a)->option(sc, 0)) |
384 | CONF_ACCEPT; |
385 | } |
386 | } |
387 | |
388 | /* --- Nobody understood the option --- */ |
389 | |
390 | CONF_END; |
391 | } |
392 | |
393 | /* --- @read@ --- */ |
394 | |
395 | static source *ssource_read(scanner *sc) |
396 | { |
397 | ssource *ss; |
398 | |
399 | (void)(conf_prefix(sc, "socket") || conf_prefix(sc, "sk")); |
400 | ss = CREATE(ssource); |
401 | ss->s.ops = &ssource_ops; |
402 | ss->s.desc = 0; |
403 | ss->t = 0; |
404 | ss->a = getaddr(sc, ADDR_SRC); |
405 | if (ss->a->ops->initopts) |
406 | ss->ao = ss->a->ops->initopts(); |
407 | else |
408 | ss->ao = CREATE(addr_opts); |
409 | *ss->ao = gao; |
410 | ss->o = ssgo; |
411 | return (&ss->s); |
412 | } |
413 | |
414 | /* --- @ss_accept@ --- * |
415 | * |
416 | * Arguments: @int fd@ = file descriptor to accept from |
417 | * @unsigned mode@ = what's ready with the descriptor |
418 | * @void *p@ = pointer to the source definition |
419 | * |
420 | * Returns: --- |
421 | * |
422 | * Use: Accepts an incoming connection and attaches it to a target |
423 | * endpoint. |
424 | */ |
425 | |
0fe44b09 |
426 | static void ssource_destroy(source */*s*/); |
427 | |
48bb1f76 |
428 | static void ss_accept(int fd, unsigned mode, void *p) |
429 | { |
430 | ssource *ss = p; |
431 | ssept *e; |
432 | endpt *ee; |
433 | reffd *r; |
434 | |
435 | /* --- Make the file descriptor --- */ |
436 | |
437 | { |
438 | int opt = 1; |
439 | if ((r = ss->a->ops->accept(fd, ss->ao, ss->s.desc)) == 0) |
440 | return; |
441 | setsockopt(r->fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt)); |
442 | fdflags(r->fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
443 | } |
444 | |
445 | /* --- Make an endpoint --- */ |
446 | |
447 | e = CREATE(ssept); |
448 | e->e.ops = &ssept_ops; |
449 | e->e.other = 0; |
450 | e->e.f = EPF_FILE; |
451 | e->e.t = 0; |
452 | e->e.in = e->e.out = r; |
453 | e->s = ss; |
454 | REFFD_INC(r); |
455 | |
456 | /* --- Obtain the target endpoint and let rip --- */ |
457 | |
458 | if ((ee = ss->t->ops->create(ss->t, ss->s.desc)) == 0) { |
459 | REFFD_DEC(r); |
460 | REFFD_DEC(r); |
461 | DESTROY(e); |
462 | return; |
463 | } |
0fe44b09 |
464 | fw_inc(); |
48bb1f76 |
465 | |
466 | /* --- Remove the listening socket if necessary --- */ |
467 | |
0fe44b09 |
468 | switch (ss->o.opt) { |
469 | case SOCKOPT_LIMIT: |
470 | ss->o.conn--; |
471 | if (!ss->o.conn) { |
472 | if (!(ss->ao->f & ADDRF_NOLOG)) |
473 | fw_log(-1, "[%s] maximum connections reached", ss->s.desc); |
474 | sel_rmfile(&ss->r); |
475 | close(ss->r.fd); |
476 | if (ss->a->ops->unbind) |
477 | ss->a->ops->unbind(ss->a); |
478 | } |
479 | break; |
480 | case SOCKOPT_NOLIMIT: |
481 | break; |
482 | case SOCKOPT_ONESHOT: |
483 | sel_rmfile(&ss->r); |
484 | close(ss->r.fd); |
485 | if (ss->a->ops->unbind) |
486 | ss->a->ops->unbind(ss->a); |
487 | ssource_destroy(&ss->s); |
488 | break; |
48bb1f76 |
489 | } |
490 | |
491 | /* --- Let everything else happen --- */ |
492 | |
48bb1f76 |
493 | endpt_join(&e->e, ee); |
494 | } |
495 | |
496 | /* --- @ss_listen@ --- * |
497 | * |
498 | * Arguments: @ssource *ss@ = source to listen on |
499 | * |
500 | * Returns: --- |
501 | * |
502 | * Use: Sets the socket to listen again, if it stopped for some |
503 | * reason. This is a copy of the code in the @read@ function, |
504 | * because it has different (wildly different) error handling |
505 | * behaviour. |
506 | */ |
507 | |
48bb1f76 |
508 | static void ss_listen(ssource *ss) |
509 | { |
510 | gen_addr *ga = (gen_addr *)ss->a; |
511 | int fd; |
512 | |
0fe44b09 |
513 | if (!(ss->ao->f & ADDRF_NOLOG)) |
514 | fw_log(-1, "[%s] reattaching listener", ss->s.desc); |
48bb1f76 |
515 | |
516 | /* --- Make the socket --- */ |
517 | |
518 | if ((fd = socket(ga->a.ops->pf, SOCK_STREAM, 0)) < 0) { |
519 | fw_log(-1, "[%s] couldn't create socket: %s", |
520 | ss->s.desc, strerror(errno)); |
521 | goto fail_0; |
522 | } |
523 | |
524 | /* --- Set it to allow address reuse --- */ |
525 | |
526 | { |
527 | int opt = 1; |
528 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); |
529 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
530 | } |
531 | |
532 | /* --- Bind it to the right port --- */ |
533 | |
534 | if (bind(fd, &ga->sa, ga->a.sz)) { |
20922c31 |
535 | fw_log(-1, "[%s] couldn't bind socket: %s", ss->s.desc, strerror(errno)); |
48bb1f76 |
536 | goto fail_1; |
537 | } |
538 | if (ga->a.ops->bound) |
539 | ga->a.ops->bound(&ga->a, ss->ao); |
540 | |
541 | /* --- Set it to listen for connections --- */ |
542 | |
543 | if (listen(fd, 5)) { |
544 | fw_log(-1, "[%s] couldn't listen on socket: %s", |
545 | ss->s.desc, strerror(errno)); |
546 | goto fail_1; |
547 | } |
548 | |
549 | /* --- Set the listener up again --- */ |
550 | |
551 | ss->r.fd = fd; |
552 | sel_addfile(&ss->r); |
553 | return; |
554 | |
555 | /* --- Tidy up if it failed --- * |
556 | * |
557 | * I'll just remove the entire source. |
558 | */ |
559 | |
560 | fail_1: |
561 | close(fd); |
562 | fail_0: |
563 | ss->o.conn = 0; |
564 | ssource_destroy(&ss->s); |
565 | } |
566 | |
567 | /* --- @attach@ --- */ |
568 | |
569 | static void ssource_attach(source *s, scanner *sc, target *t) |
570 | { |
571 | ssource *ss = (ssource *)s; |
572 | int fd; |
573 | |
574 | ss->t = t; |
575 | |
576 | /* --- Initialize the description string --- */ |
577 | |
578 | { |
579 | dstr d = DSTR_INIT; |
580 | dstr_puts(&d, "socket."); |
581 | ss->a->ops->print(ss->a, ADDR_SRC, &d); |
582 | dstr_puts(&d, " -> "); |
583 | dstr_puts(&d, ss->t->desc); |
584 | ss->s.desc = xstrdup(d.buf); |
585 | dstr_destroy(&d); |
586 | } |
587 | |
588 | /* --- Initialize the socket for listening --- */ |
589 | |
590 | { |
591 | gen_addr *ga = (gen_addr *)ss->a; |
592 | |
593 | /* --- Make the socket --- */ |
594 | |
595 | if ((fd = socket(ga->a.ops->pf, SOCK_STREAM, 0)) < 0) |
596 | error(sc, "couldn't create socket: %s", strerror(errno)); |
597 | |
598 | /* --- Set it to allow address reuse --- */ |
599 | |
600 | { |
601 | int opt = 1; |
602 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); |
603 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
604 | } |
605 | |
606 | /* --- Bind it to the right port --- */ |
607 | |
608 | if (bind(fd, &ga->sa, ga->a.sz)) |
609 | error(sc, "couldn't bind to %s: %s", ss->s.desc, strerror(errno)); |
610 | if (ga->a.ops->bound) |
611 | ga->a.ops->bound(&ga->a, ss->ao); |
612 | |
613 | /* --- Set it to listen for connections --- */ |
614 | |
615 | if (listen(fd, 5)) |
616 | error(sc, "couldn't listen on socket: %s", strerror(errno)); |
617 | } |
618 | |
619 | /* --- We're ready to go now --- */ |
620 | |
621 | sel_initfile(sel, &ss->r, fd, SEL_READ, ss_accept, ss); |
622 | sel_addfile(&ss->r); |
623 | source_add(&ss->s); |
624 | fw_inc(); |
625 | } |
626 | |
627 | /* --- @destroy@ --- */ |
628 | |
629 | static void ssource_destroy(source *s) |
630 | { |
631 | ssource *ss = (ssource *)s; |
632 | |
14865057 |
633 | if (ss->o.conn || ss->o.opt != SOCKOPT_LIMIT) { |
48bb1f76 |
634 | sel_rmfile(&ss->r); |
635 | close(ss->r.fd); |
636 | if (ss->a->ops->unbind) |
637 | ss->a->ops->unbind(ss->a); |
638 | } |
639 | if (ss->a->ops->freeopts) |
640 | ss->a->ops->freeopts(ss->ao); |
641 | else |
642 | DESTROY(ss->ao); |
372a98e2 |
643 | free(ss->s.desc); |
48bb1f76 |
644 | ss->a->ops->destroy(ss->a); |
645 | ss->t->ops->destroy(ss->t); |
646 | source_remove(&ss->s); |
647 | DESTROY(ss); |
648 | fw_dec(); |
649 | } |
650 | |
651 | /* --- Source definition block --- */ |
652 | |
653 | source_ops ssource_ops = { |
654 | "socket", |
655 | ssource_option, ssource_read, ssource_attach, ssource_destroy |
656 | }; |
657 | |
658 | /*----- Target definition -------------------------------------------------*/ |
659 | |
660 | /* --- @read@ --- */ |
661 | |
662 | static target *starget_read(scanner *sc) |
663 | { |
664 | starget *st; |
665 | dstr d = DSTR_INIT; |
666 | |
667 | (void)(conf_prefix(sc, "socket") || conf_prefix(sc, "sk")); |
668 | st = CREATE(starget); |
669 | st->t.ops = &starget_ops; |
670 | st->a = getaddr(sc, ADDR_DEST); |
671 | dstr_puts(&d, "socket."); |
672 | st->a->ops->print(st->a, ADDR_DEST, &d); |
673 | st->t.desc = xstrdup(d.buf); |
674 | dstr_destroy(&d); |
675 | return (&st->t); |
676 | } |
677 | |
678 | /* --- @create@ --- * |
679 | * |
680 | * Arguments: @target *t@ = pointer to target |
681 | * @const char *desc@ = description of connection |
682 | * |
683 | * Returns: Pointer to a created endpoint. |
684 | * |
685 | * Use: Generates a target endpoint for communication. |
686 | */ |
687 | |
688 | static endpt *starget_create(target *t, const char *desc) |
689 | { |
690 | starget *st = (starget *)t; |
691 | stept *e = CREATE(stept); |
692 | int fd; |
693 | gen_addr *ga = (gen_addr *)st->a; |
694 | int opt; |
695 | |
696 | if ((fd = socket(st->a->ops->pf, SOCK_STREAM, 0)) < 0) |
697 | return (0); |
698 | setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt)); |
699 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
700 | e->e.ops = &stept_ops; |
701 | e->e.other = 0; |
702 | e->e.f = EPF_FILE | SKF_CONN; |
703 | e->e.t = 0; |
372a98e2 |
704 | e->desc = xstrdup(desc); |
48bb1f76 |
705 | |
706 | /* --- Pay attention --- * |
707 | * |
708 | * This bit is quite subtle. The connect can succeed or fail later: that's |
709 | * fine. The problem comes if it makes its mind up right now. The flag |
710 | * @SKF_CONN@ signifies that I'm trying to connect. I set it up to begin |
711 | * with and @stept_go@ turns it off when it's done: @stept_close@ uses it |
712 | * to decide whether to kill the connection. The flag @EPF_PENDING@ is |
713 | * only set after @conn_init@ returns and @SKF_CONN@ is still set (meaning |
714 | * that the connection is still in progress). That's used to let |
715 | * @stept_go@ know whether to kill the other endpoint. The flag |
716 | * @SKF_BROKEN@ is used to signify an immediate failure. |
717 | */ |
718 | |
719 | conn_init(&e->c, sel, fd, &ga->sa, ga->a.sz, stept_go, e); |
720 | if (e->e.f & SKF_BROKEN) { |
721 | DESTROY(e); |
722 | return (0); |
723 | } |
724 | if (e->e.f & SKF_CONN) |
725 | e->e.f |= EPF_PENDING; |
726 | fw_inc(); |
727 | return (&e->e); |
728 | } |
729 | |
730 | /* --- @destroy@ --- */ |
731 | |
732 | static void starget_destroy(target *t) |
733 | { |
734 | starget *st = (starget *)t; |
735 | st->a->ops->destroy(st->a); |
372a98e2 |
736 | free(st->t.desc); |
48bb1f76 |
737 | DESTROY(st); |
738 | } |
739 | |
740 | /* --- Socket target definition block --- */ |
741 | |
742 | target_ops starget_ops = { |
743 | "socket", |
744 | 0, starget_read, starget_create, starget_destroy |
745 | }; |
746 | |
747 | /*----- That's all, folks -------------------------------------------------*/ |