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