| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: socket.c,v 1.4 1999/12/22 15:44:25 mdw Exp $ |
| 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 $ |
| 32 | * Revision 1.4 1999/12/22 15:44:25 mdw |
| 33 | * Fix log message. |
| 34 | * |
| 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 | * |
| 39 | * Revision 1.2 1999/07/27 18:30:53 mdw |
| 40 | * Various minor portability fixes. |
| 41 | * |
| 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> |
| 53 | #include <limits.h> |
| 54 | #include <stdio.h> |
| 55 | #include <stdlib.h> |
| 56 | #include <string.h> |
| 57 | |
| 58 | #include <sys/types.h> |
| 59 | #include <unistd.h> |
| 60 | |
| 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 { |
| 89 | unsigned opt; |
| 90 | unsigned conn; |
| 91 | } ssource_opts; |
| 92 | |
| 93 | static ssource_opts ssgo = { 256, 0 }; |
| 94 | |
| 95 | #define SOCKOPT_LIMIT 0u |
| 96 | #define SOCKOPT_NOLIMIT 1u |
| 97 | #define SOCKOPT_ONESHOT 2u |
| 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 | |
| 229 | if (ee->s->o.opt == SOCKOPT_LIMIT) { |
| 230 | ee->s->o.conn++; |
| 231 | if (ee->s->o.conn == 1) |
| 232 | ss_listen(ee->s); |
| 233 | } |
| 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 = { |
| 309 | 0, 0, sept_wclose, ssept_close |
| 310 | }; |
| 311 | |
| 312 | static endpt_ops stept_ops = { |
| 313 | 0, 0, sept_wclose, stept_close |
| 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); |
| 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 | } |
| 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 | |
| 419 | static void ssource_destroy(source */*s*/); |
| 420 | |
| 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 | } |
| 457 | fw_inc(); |
| 458 | |
| 459 | /* --- Remove the listening socket if necessary --- */ |
| 460 | |
| 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; |
| 482 | } |
| 483 | |
| 484 | /* --- Let everything else happen --- */ |
| 485 | |
| 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 | |
| 501 | static void ss_listen(ssource *ss) |
| 502 | { |
| 503 | gen_addr *ga = (gen_addr *)ss->a; |
| 504 | int fd; |
| 505 | |
| 506 | if (!(ss->ao->f & ADDRF_NOLOG)) |
| 507 | fw_log(-1, "[%s] reattaching listener", ss->s.desc); |
| 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)) { |
| 528 | fw_log(-1, "[%s] couldn't bind socket: %s", ss->s.desc, strerror(errno)); |
| 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 -------------------------------------------------*/ |