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