3 * Socket source and target definitions
5 * (c) 1999 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of the `fwd' port forwarder.
12 * `fwd' is free software; you can redistribute it and/or modify
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.
17 * `fwd' is distributed in the hope that it will be useful,
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.
22 * You should have received a copy of the GNU General Public License
23 * along with `fwd'; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Data structures ---------------------------------------------------*/
31 /* --- Socket source options --- */
33 typedef struct ssource_opts {
39 static ssource_opts ssgo = { 256, 0, 5 };
41 #define SOCKOPT_LIMIT 0u
42 #define SOCKOPT_NOLIMIT 1u
43 #define SOCKOPT_ONESHOT 2u
45 /* --- Socket source --- */
47 typedef struct ssource {
56 /* --- Socket target --- */
58 typedef struct starget {
64 /* --- Socket target endpoint --- */
66 typedef struct stept {
72 /* --- Socket source endpoint --- */
74 typedef struct ssept {
79 /*----- Protocol table ----------------------------------------------------*/
81 static addr_ops *addrs[] = { &inet_ops, &un_ops, 0 };
83 /*----- Other persistent variables ----------------------------------------*/
85 static addr_opts gsao = { 0 }, gtao = { 0 };
87 /*----- Parsing address types ---------------------------------------------*/
89 /* --- @getaddrtype@ --- *
91 * Arguments: @scanner *sc@ = pointer to scanner (for error reporting)
92 * @const char *p@ = pointer to protocol name
93 * @int abbrev@ = nonzero to allow abbreviations
95 * Returns: Pointer to address operations table or null.
97 * Use: Looks up a protocol name. Handy when parsing addresses and
98 * other bits of configuration. Returns null if no matching
102 static addr_ops *getaddrtype(scanner *sc, const char *p, int abbrev)
105 addr_ops *chosen = 0;
106 size_t sz = strlen(p);
108 for (ops = addrs; *ops; ops++) {
109 if (strncmp((*ops)->name, p, sz) == 0) {
110 if ((*ops)->name[sz] == 0)
112 else if (chosen && abbrev)
113 error(sc, "ambiguous socket address type `%s'", p);
122 /* --- @getaddr@ --- *
124 * Arguments: @scanner *sc@ = pointer to scanner to read from
125 * @unsigned type@ = address type (@ADDR_SRC@ or @ADDR_DEST@)
127 * Returns: Pointer to an address successfully read.
129 * Use: Reads an optionally qualified address.
132 static addr *getaddr(scanner *sc, unsigned type)
141 if (sc->t == CTOK_WORD)
142 ops = getaddrtype(sc, sc->d.buf, abbrev);
146 error(sc, "unknown socket address type `%s'", sc->d.buf);
152 return (ops->read(sc, type));
155 /*----- Socket endpoints --------------------------------------------------*/
157 /* --- @wclose@ --- */
159 static void sept_wclose(endpt *e)
161 shutdown(e->out->fd, 1);
164 /* --- @close@ (source) --- */
166 static void ss_listen(ssource */*ss*/);
168 static void ssept_close(endpt *e)
170 ssept *ee = (ssept *)e;
172 if (ee->s->o.opt == SOCKOPT_LIMIT) {
174 if (ee->s->o.conn == 1)
178 REFFD_DEC(ee->e.out);
183 /* --- @close@ (target) --- */
185 static void stept_close(endpt *e)
187 stept *ee = (stept *)e;
189 if (ee->e.f & EPF_PENDING)
193 REFFD_DEC(ee->e.out);
201 /* --- @starget_connected@ --- *
203 * Arguments: @int fd@ = file descriptor now ready for use
204 * @void *p@ = pointer to an endpoint structure
208 * Use: Handles successful connection of the target endpoint.
211 void starget_connected(int fd, void *p)
216 fw_log(-1, "[%s] connection failed: %s", e->desc, strerror(errno));
219 reffd *r = reffd_init(fd);
222 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
223 setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
224 e->e.in = e->e.out = r;
225 e->e.f &= ~EPF_PENDING;
227 endpt_join(&e->e, e->e.other);
231 /* --- Socket endpoint definition --- */
233 static endpt_ops ssept_ops = {
234 0, 0, sept_wclose, ssept_close
237 static endpt_ops stept_ops = {
238 0, 0, sept_wclose, stept_close
241 /*----- Source definition -------------------------------------------------*/
243 /* --- @option@ --- */
245 static int ssource_option(source *s, scanner *sc)
247 ssource *ss = (ssource *)s;
248 ssource_opts *sso = ss ? &ss->o : &ssgo;
250 CONF_BEGIN(sc, "socket", "socket source")
252 /* --- Make sure the next token is a word --- */
254 if (sc->t != CTOK_WORD)
255 error(sc, "parse error, option keyword expected");
257 /* --- Handle options at this level --- */
259 if (strcmp(sc->d.buf, "conn") == 0) {
263 if (sc->t != CTOK_WORD)
264 error(sc, "parse error, expected `unlimited', `one-shot' or number");
265 if (isdigit((unsigned char)sc->d.buf[0])) {
266 sso->conn = atoi(sc->d.buf);
268 error(sc, "argument of `conn' must be positive");
269 sso->opt = SOCKOPT_LIMIT;
273 sso->opt = 1 + (1 & conf_enum(sc,
274 "unlimited,one-shot,infinite",
275 ENUM_ABBREV, "`conn' option"));
280 if (strcmp(sc->d.buf, "listen") == 0) {
284 if (sc->t != CTOK_WORD || !isdigit((unsigned char)sc->d.buf[0]))
285 error(sc, "parse error, expected number");
286 sso->listen = atoi(sc->d.buf);
287 if (sso->listen == 0)
288 error(sc, "argument of `listen' must be positive");
293 if (strcmp(sc->d.buf, "logging") == 0 ||
294 strcmp(sc->d.buf, "log") == 0) {
295 addr_opts *ao = ss ? ss->ao : &gsao;
299 if (conf_enum(sc, "no,yes", ENUM_ABBREV, "logging status"))
300 ao->f &= ~ADDRF_NOLOG;
302 ao->f |= ADDRF_NOLOG;
306 /* --- Pass the option around the various address types --- */
309 if (ss->a->ops->option && ss->a->ops->option(sc, ss->ao, ADDR_SRC))
313 for (a = addrs; *a; a++) {
314 if ((*a)->option && (*a)->option(sc, 0, ADDR_GLOBAL))
319 /* --- Nobody understood the option --- */
326 static source *ssource_read(scanner *sc)
330 (void)(conf_prefix(sc, "socket") || conf_prefix(sc, "sk"));
331 ss = CREATE(ssource);
332 ss->s.ops = &ssource_ops;
335 ss->a = getaddr(sc, ADDR_SRC);
336 if (ss->a->ops->initsrcopts)
337 ss->ao = ss->a->ops->initsrcopts();
339 ss->ao = CREATE(addr_opts);
346 /* --- @ss_accept@ --- *
348 * Arguments: @int fd@ = file descriptor to accept from
349 * @unsigned mode@ = what's ready with the descriptor
350 * @void *p@ = pointer to the source definition
354 * Use: Accepts an incoming connection and attaches it to a target
358 static void ssource_destroy(source */*s*/);
360 static void ss_accept(int fd, unsigned mode, void *p)
367 /* --- Make the file descriptor --- */
371 if ((r = ss->a->ops->accept(fd, ss->ao, ss->s.desc)) == 0)
373 setsockopt(r->fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
374 fdflags(r->fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
377 /* --- Make an endpoint --- */
380 e->e.ops = &ssept_ops;
384 e->e.in = e->e.out = r;
388 /* --- Obtain the target endpoint and let rip --- */
390 if ((ee = ss->t->ops->create(ss->t, ss->s.desc)) == 0) {
398 /* --- Remove the listening socket if necessary --- */
404 if (!(ss->ao->f & ADDRF_NOLOG))
405 fw_log(-1, "[%s] maximum connections reached", ss->s.desc);
408 if (ss->a->ops->unbind)
409 ss->a->ops->unbind(ss->a);
412 case SOCKOPT_NOLIMIT:
414 case SOCKOPT_ONESHOT:
417 if (ss->a->ops->unbind)
418 ss->a->ops->unbind(ss->a);
419 ssource_destroy(&ss->s);
423 /* --- Let everything else happen --- */
425 endpt_join(&e->e, ee);
428 /* --- @ss_listen@ --- *
430 * Arguments: @ssource *ss@ = source to listen on
434 * Use: Sets the socket to listen again, if it stopped for some
435 * reason. This is a copy of the code in the @read@ function,
436 * because it has different (wildly different) error handling
440 static void ss_listen(ssource *ss)
445 if (!(ss->ao->f & ADDRF_NOLOG))
446 fw_log(-1, "[%s] reattaching listener", ss->s.desc);
448 /* --- Make the socket --- */
450 if ((fd = ss->a->ops->bind(ss->a, ss->ao)) < 0) {
451 fw_log(-1, "[%s] couldn't create socket: %s",
452 ss->s.desc, strerror(errno));
456 /* --- Set it to listen for connections --- */
458 setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
459 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
460 if (listen(fd, ss->o.listen)) {
461 fw_log(-1, "[%s] couldn't listen on socket: %s",
462 ss->s.desc, strerror(errno));
466 /* --- Set the listener up again --- */
472 /* --- Tidy up if it failed --- *
474 * I'll just remove the entire source.
481 ssource_destroy(&ss->s);
484 /* --- @attach@ --- */
486 static void ssource_attach(source *s, scanner *sc, target *t)
488 ssource *ss = (ssource *)s;
494 /* --- Initialize the description string --- */
498 dstr_puts(&d, "socket.");
499 ss->a->ops->print(ss->a, ADDR_SRC, &d);
500 dstr_puts(&d, " -> ");
501 dstr_puts(&d, ss->t->desc);
502 ss->s.desc = xstrdup(d.buf);
506 /* --- Confirm the address --- */
508 if (ss->a->ops->confirm)
509 ss->a->ops->confirm(ss->a, ADDR_SRC, ss->ao);
511 /* --- Initialize the socket for listening --- */
513 if ((fd = ss->a->ops->bind(ss->a, ss->ao)) < 0)
514 error(sc, "couldn't bind socket `%s': %s", ss->s.desc, strerror(errno));
516 /* --- Set it to listen for connections --- */
518 setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
519 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
520 if (listen(fd, ss->o.listen)) {
521 error(sc, "couldn't listen on socket `%s': %s",
522 ss->s.desc, strerror(errno));
525 /* --- We're ready to go now --- */
527 sel_initfile(sel, &ss->r, fd, SEL_READ, ss_accept, ss);
533 /* --- @destroy@ --- */
535 static void ssource_destroy(source *s)
537 ssource *ss = (ssource *)s;
539 if (ss->o.conn || ss->o.opt != SOCKOPT_LIMIT) {
542 if (ss->a->ops->unbind)
543 ss->a->ops->unbind(ss->a);
545 if (ss->a->ops->freesrcopts)
546 ss->a->ops->freesrcopts(ss->ao);
550 ss->a->ops->destroy(ss->a);
551 ss->t->ops->destroy(ss->t);
552 source_remove(&ss->s);
557 /* --- Source definition block --- */
559 source_ops ssource_ops = {
561 ssource_option, ssource_read, ssource_attach, ssource_destroy
564 /*----- Target definition -------------------------------------------------*/
566 /* --- @options@ --- */
568 static int starget_option(target *t, scanner *sc)
570 starget *st = (starget *)t;
572 CONF_BEGIN(sc, "starget", "socket target")
574 /* --- Pass the option around the various address types --- */
577 if (st->a->ops->option && st->a->ops->option(sc, st->ao, ADDR_DEST))
580 /* We'd have done it already if it was global */
589 static target *starget_read(scanner *sc)
594 (void)(conf_prefix(sc, "socket") || conf_prefix(sc, "sk"));
595 st = CREATE(starget);
596 st->t.ops = &starget_ops;
597 st->a = getaddr(sc, ADDR_DEST);
598 if (st->a->ops->inittargopts)
599 st->ao = st->a->ops->inittargopts();
601 st->ao = CREATE(addr_opts);
604 dstr_puts(&d, "socket.");
605 st->a->ops->print(st->a, ADDR_DEST, &d);
606 st->t.desc = xstrdup(d.buf);
611 /* --- @confirm@ --- */
613 static void starget_confirm(target *t)
615 starget *st = (starget *)t;
617 if (st->a->ops->confirm)
618 st->a->ops->confirm(st->a, ADDR_DEST, st->ao);
621 /* --- @create@ --- */
623 static endpt *starget_create(target *t, const char *desc)
625 starget *st = (starget *)t;
626 stept *e = CREATE(stept);
628 e->e.ops = &stept_ops;
630 e->e.f = EPF_FILE | EPF_PENDING;
632 e->desc = xstrdup(desc);
633 if (st->a->ops->connect(st->a, st->ao, &e->c, &e->e)) {
634 fw_log(-1, "[%s] couldn't connect: %s", e->desc, strerror(errno));
642 /* --- @destroy@ --- */
644 static void starget_destroy(target *t)
646 starget *st = (starget *)t;
647 if (st->a->ops->freetargopts)
648 st->a->ops->freetargopts(st->ao);
651 st->a->ops->destroy(st->a);
656 /* --- Socket target definition block --- */
658 target_ops starget_ops = {
660 starget_option, starget_read, starget_confirm,
661 starget_create, starget_destroy
664 /*----- That's all, folks -------------------------------------------------*/