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