mdw@git.distorted.org.uk Git - fwd/blob - socket.c

   1 /* -*-c-*-
   2  *
   3  * $Id: socket.c,v 1.11 2003/11/29 20:36:07 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 1.11  2003/11/29 20:36:07  mdw
  33  * Privileged outgoing connections.
  34  *
  35  * Revision 1.10  2003/11/25 14:08:23  mdw
  36  * Debianization.  Socket target options.  Internet binding.
  37  *
  38  * Revision 1.9  2002/02/23 00:08:00  mdw
  39  * Fix stupid bugs from the listen(2) change.
  40  *
  41  * Revision 1.8  2002/02/22 23:44:44  mdw
  42  * Call @xfree@ rather than @free@.  Add option to change the listen(2)
  43  * parameter.
  44  *
  45  * Revision 1.7  2001/06/22 19:37:00  mdw
  46  * New @conn_init@ interface.
  47  *
  48  * Revision 1.6  2001/02/03 20:30:03  mdw
  49  * Support re-reading config files on SIGHUP.
  50  *
  51  * Revision 1.5  2000/03/23 23:20:42  mdw
  52  * Remove listener even if connection option isn't SOCKOPT_LIMITED.
  53  *
  54  * Revision 1.4  1999/12/22 15:44:25  mdw
  55  * Fix log message.
  56  *
  57  * Revision 1.3  1999/10/22 22:48:36  mdw
  58  * New connection options: unlimited concurrent connections, and one-shot
  59  * listening sockets.
  60  *
  61  * Revision 1.2  1999/07/27 18:30:53  mdw
  62  * Various minor portability fixes.
  63  *
  64  * Revision 1.1  1999/07/26 23:33:32  mdw
  65  * New sources and targets.
  66  *
  67  */
  68
  69 /*----- Header files ------------------------------------------------------*/
  70
  71 #include "config.h"
  72
  73 #include <ctype.h>
  74 #include <errno.h>
  75 #include <limits.h>
  76 #include <stdio.h>
  77 #include <stdlib.h>
  78 #include <string.h>
  79
  80 #include <sys/types.h>
  81 #include <unistd.h>
  82
  83 #include <sys/socket.h>
  84 #include <netinet/in.h>
  85 #include <arpa/inet.h>
  86 #include <netdb.h>
  87
  88 #include <mLib/alloc.h>
  89 #include <mLib/conn.h>
  90 #include <mLib/dstr.h>
  91 #include <mLib/fdflags.h>
  92 #include <mLib/sel.h>
  93 #include <mLib/sub.h>
  94
  95 #include "addr.h"
  96 #include "conf.h"
  97 #include "endpt.h"
  98 #include "fw.h"
  99 #include "scan.h"
 100 #include "socket.h"
 101 #include "target.h"
 102
 103 #include "inet.h"
 104 #include "un.h"
 105
 106 /*----- Data structures ---------------------------------------------------*/
 107
 108 /* --- Socket source options --- */
 109
 110 typedef struct ssource_opts {
 111   unsigned opt;
 112   unsigned conn;
 113   unsigned listen;
 114 } ssource_opts;
 115
 116 static ssource_opts ssgo = { 256, 0, 5 };
 117
 118 #define SOCKOPT_LIMIT 0u
 119 #define SOCKOPT_NOLIMIT 1u
 120 #define SOCKOPT_ONESHOT 2u
 121
 122 /* --- Socket source --- */
 123
 124 typedef struct ssource {
 125   source s;
 126   addr *a;
 127   target *t;
 128   addr_opts *ao;
 129   ssource_opts o;
 130   sel_file r;
 131 } ssource;
 132
 133 /* --- Socket target --- */
 134
 135 typedef struct starget {
 136   target t;
 137   addr *a;
 138   addr_opts *ao;
 139 } starget;
 140
 141 /* --- Socket target endpoint --- */
 142
 143 typedef struct stept {
 144   endpt e;
 145   conn c;
 146   char *desc;
 147 } stept;
 148
 149 /* --- Socket source endpoint --- */
 150
 151 typedef struct ssept {
 152   endpt e;
 153   ssource *s;
 154 } ssept;
 155
 156 /*----- Protocol table ----------------------------------------------------*/
 157
 158 static addr_ops *addrs[] = { &inet_ops, &un_ops, 0 };
 159
 160 /*----- Other persistent variables ----------------------------------------*/
 161
 162 static addr_opts gsao = { 0 }, gtao = { 0 };
 163
 164 /*----- Parsing address types ---------------------------------------------*/
 165
 166 /* --- @getaddrtype@ --- *
 167  *
 168  * Arguments:   @scanner *sc@ = pointer to scanner (for error reporting)
 169  *              @const char *p@ = pointer to protocol name
 170  *              @int abbrev@ = nonzero to allow abbreviations
 171  *
 172  * Returns:     Pointer to address operations table or null.
 173  *
 174  * Use:         Looks up a protocol name.  Handy when parsing addresses and
 175  *              other bits of configuration.  Returns null if no matching
 176  *              address was found.
 177  */
 178
 179 static addr_ops *getaddrtype(scanner *sc, const char *p, int abbrev)
 180 {
 181   addr_ops **ops;
 182   addr_ops *chosen = 0;
 183   size_t sz = strlen(p);
 184
 185   for (ops = addrs; *ops; ops++) {
 186     if (strncmp((*ops)->name, p, sz) == 0) {
 187       if ((*ops)->name[sz] == 0)
 188         return (*ops);
 189       else if (chosen && abbrev)
 190         error(sc, "ambiguous socket address type `%s'", p);
 191       chosen = *ops;
 192     }
 193   }
 194   if (!abbrev)
 195     return (0);
 196   return (chosen);
 197 }
 198
 199 /* --- @getaddr@ --- *
 200  *
 201  * Arguments:   @scanner *sc@ = pointer to scanner to read from
 202  *              @unsigned type@ = address type (@ADDR_SRC@ or @ADDR_DEST@)
 203  *
 204  * Returns:     Pointer to an address successfully read.
 205  *
 206  * Use:         Reads an optionally qualified address.
 207  */
 208
 209 static addr *getaddr(scanner *sc, unsigned type)
 210 {
 211   addr_ops *ops = 0;
 212   int abbrev = 0;
 213
 214   if (sc->t == ':') {
 215     token(sc);
 216     abbrev = 1;
 217   }
 218   if (sc->t == CTOK_WORD)
 219     ops = getaddrtype(sc, sc->d.buf, abbrev);
 220   if (ops)
 221     token(sc);
 222   else if (abbrev)
 223     error(sc, "unknown socket address type `%s'", sc->d.buf);
 224   else
 225     ops = &inet_ops;
 226   if (sc->t == ':')
 227     token(sc);
 228
 229   return (ops->read(sc, type));
 230 }
 231
 232 /*----- Socket endpoints --------------------------------------------------*/
 233
 234 /* --- @wclose@ --- */
 235
 236 static void sept_wclose(endpt *e)
 237 {
 238   shutdown(e->out->fd, 1);
 239 }
 240
 241 /* --- @close@ (source) --- */
 242
 243 static void ss_listen(ssource */*ss*/);
 244
 245 static void ssept_close(endpt *e)
 246 {
 247   ssept *ee = (ssept *)e;
 248
 249   if (ee->s->o.opt == SOCKOPT_LIMIT) {
 250     ee->s->o.conn++;
 251     if (ee->s->o.conn == 1)
 252       ss_listen(ee->s);
 253   }
 254   REFFD_DEC(ee->e.in);
 255   REFFD_DEC(ee->e.out);
 256   fw_dec();
 257   DESTROY(ee);
 258 }
 259
 260 /* --- @close@ (target) --- */
 261
 262 static void stept_close(endpt *e)
 263 {
 264   stept *ee = (stept *)e;
 265
 266   if (ee->e.f & EPF_PENDING)
 267     conn_kill(&ee->c);
 268   else {
 269     REFFD_DEC(ee->e.in);
 270     REFFD_DEC(ee->e.out);
 271   }
 272
 273   xfree(ee->desc);
 274   fw_dec();
 275   DESTROY(ee);
 276 }
 277
 278 /* --- @starget_connected@ --- *
 279  *
 280  * Arguments:   @int fd@ = file descriptor now ready for use
 281  *              @void *p@ = pointer to an endpoint structure
 282  *
 283  * Returns:     ---
 284  *
 285  * Use:         Handles successful connection of the target endpoint.
 286  */
 287
 288 void starget_connected(int fd, void *p)
 289 {
 290   stept *e = p;
 291
 292   if (fd == -1) {
 293     fw_log(-1, "[%s] connection failed: %s", e->desc, strerror(errno));
 294     endpt_kill(&e->e);
 295   } else {
 296     reffd *r = reffd_init(fd);
 297     int opt = 1;
 298     REFFD_INC(r);
 299     fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
 300     setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
 301     e->e.in = e->e.out = r;
 302     e->e.f &= ~EPF_PENDING;
 303     if (e->e.other)
 304       endpt_join(&e->e, e->e.other);
 305   }
 306 }
 307
 308 /* --- Socket endpoint definition --- */
 309
 310 static endpt_ops ssept_ops = {
 311   0, 0, sept_wclose, ssept_close
 312 };
 313
 314 static endpt_ops stept_ops = {
 315   0, 0, sept_wclose, stept_close
 316 };
 317
 318 /*----- Source definition -------------------------------------------------*/
 319
 320 /* --- @option@ --- */
 321
 322 static int ssource_option(source *s, scanner *sc)
 323 {
 324   ssource *ss = (ssource *)s;
 325   ssource_opts *sso = ss ? &ss->o : &ssgo;
 326
 327   CONF_BEGIN(sc, "socket", "socket source")
 328
 329   /* --- Make sure the next token is a word --- */
 330
 331   if (sc->t != CTOK_WORD)
 332     error(sc, "parse error, option keyword expected");
 333
 334   /* --- Handle options at this level --- */
 335
 336   if (strcmp(sc->d.buf, "conn") == 0) {
 337     token(sc);
 338     if (sc->t == '=')
 339       token(sc);
 340     if (sc->t != CTOK_WORD)
 341       error(sc, "parse error, expected `unlimited', `one-shot' or number");
 342     if (isdigit((unsigned char)sc->d.buf[0])) {
 343       sso->conn = atoi(sc->d.buf);
 344       if (sso->conn == 0)
 345         error(sc, "argument of `conn' must be positive");
 346       sso->opt = SOCKOPT_LIMIT;
 347       token(sc);
 348     } else {
 349       sso->conn = 0;
 350       sso->opt = 1 + (1 & conf_enum(sc,
 351                                     "unlimited,one-shot,infinite",
 352                                     ENUM_ABBREV, "`conn' option"));
 353     }
 354     CONF_ACCEPT;
 355   }
 356
 357   if (strcmp(sc->d.buf, "listen") == 0) {
 358     token(sc);
 359     if (sc->t == '=')
 360       token(sc);
 361     if (sc->t != CTOK_WORD || !isdigit((unsigned char)sc->d.buf[0]))
 362       error(sc, "parse error, expected number");
 363     sso->listen = atoi(sc->d.buf);
 364     if (sso->listen == 0)
 365       error(sc, "argument of `listen' must be positive");
 366     token(sc);
 367     CONF_ACCEPT;
 368   }
 369
 370   if (strcmp(sc->d.buf, "logging") == 0 ||
 371       strcmp(sc->d.buf, "log") == 0) {
 372     addr_opts *ao = ss ? ss->ao : &gsao;
 373     token(sc);
 374     if (sc->t == '=')
 375       token(sc);
 376     if (conf_enum(sc, "no,yes", ENUM_ABBREV, "logging status"))
 377       ao->f &= ~ADDRF_NOLOG;
 378     else
 379       ao->f |= ADDRF_NOLOG;
 380     CONF_ACCEPT;
 381   }
 382
 383   /* --- Pass the option around the various address types --- */
 384
 385   if (ss) {
 386     if (ss->a->ops->option && ss->a->ops->option(sc, ss->ao, ADDR_SRC))
 387       CONF_ACCEPT;
 388   } else {
 389     addr_ops **a;
 390     for (a = addrs; *a; a++) {
 391       if ((*a)->option && (*a)->option(sc, 0, ADDR_GLOBAL))
 392         CONF_ACCEPT;
 393     }
 394   }
 395
 396   /* --- Nobody understood the option --- */
 397
 398   CONF_END;
 399 }
 400
 401 /* --- @read@ --- */
 402
 403 static source *ssource_read(scanner *sc)
 404 {
 405   ssource *ss;
 406
 407   (void)(conf_prefix(sc, "socket") || conf_prefix(sc, "sk"));
 408   ss = CREATE(ssource);
 409   ss->s.ops = &ssource_ops;
 410   ss->s.desc = 0;
 411   ss->t = 0;
 412   ss->a = getaddr(sc, ADDR_SRC);
 413   if (ss->a->ops->initsrcopts)
 414     ss->ao = ss->a->ops->initsrcopts();
 415   else
 416     ss->ao = CREATE(addr_opts);
 417   *ss->ao = gsao;
 418   ss->o = ssgo;
 419   return (&ss->s);
 420 }
 421
 422 /* --- @ss_accept@ --- *
 423  *
 424  * Arguments:   @int fd@ = file descriptor to accept from
 425  *              @unsigned mode@ = what's ready with the descriptor
 426  *              @void *p@ = pointer to the source definition
 427  *
 428  * Returns:     ---
 429  *
 430  * Use:         Accepts an incoming connection and attaches it to a target
 431  *              endpoint.
 432  */
 433
 434 static void ssource_destroy(source */*s*/);
 435
 436 static void ss_accept(int fd, unsigned mode, void *p)
 437 {
 438   ssource *ss = p;
 439   ssept *e;
 440   endpt *ee;
 441   reffd *r;
 442
 443   /* --- Make the file descriptor --- */
 444
 445   {
 446     int opt = 1;
 447     if ((r = ss->a->ops->accept(fd, ss->ao, ss->s.desc)) == 0)
 448       return;
 449     setsockopt(r->fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
 450     fdflags(r->fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
 451   }
 452
 453   /* --- Make an endpoint --- */
 454
 455   e = CREATE(ssept);
 456   e->e.ops = &ssept_ops;
 457   e->e.other = 0;
 458   e->e.f = EPF_FILE;
 459   e->e.t = 0;
 460   e->e.in = e->e.out = r;
 461   e->s = ss;
 462   REFFD_INC(r);
 463
 464   /* --- Obtain the target endpoint and let rip --- */
 465
 466   if ((ee = ss->t->ops->create(ss->t, ss->s.desc)) == 0) {
 467     REFFD_DEC(r);
 468     REFFD_DEC(r);
 469     DESTROY(e);
 470     return;
 471   }
 472   fw_inc();
 473
 474   /* --- Remove the listening socket if necessary --- */
 475
 476   switch (ss->o.opt) {
 477     case SOCKOPT_LIMIT:
 478       ss->o.conn--;
 479       if (!ss->o.conn) {
 480         if (!(ss->ao->f & ADDRF_NOLOG))
 481           fw_log(-1, "[%s] maximum connections reached", ss->s.desc);
 482         sel_rmfile(&ss->r);
 483         close(ss->r.fd);
 484         if (ss->a->ops->unbind)
 485           ss->a->ops->unbind(ss->a);
 486       }
 487       break;
 488     case SOCKOPT_NOLIMIT:
 489       break;
 490     case SOCKOPT_ONESHOT:
 491       sel_rmfile(&ss->r);
 492       close(ss->r.fd);
 493       if (ss->a->ops->unbind)
 494         ss->a->ops->unbind(ss->a);
 495       ssource_destroy(&ss->s);
 496       break;
 497   }
 498
 499   /* --- Let everything else happen --- */
 500
 501   endpt_join(&e->e, ee);
 502 }
 503
 504 /* --- @ss_listen@ --- *
 505  *
 506  * Arguments:   @ssource *ss@ = source to listen on
 507  *
 508  * Returns:     ---
 509  *
 510  * Use:         Sets the socket to listen again, if it stopped for some
 511  *              reason.  This is a copy of the code in the @read@ function,
 512  *              because it has different (wildly different) error handling
 513  *              behaviour.
 514  */
 515
 516 static void ss_listen(ssource *ss)
 517 {
 518   int fd;
 519   int opt = 1;
 520
 521   if (!(ss->ao->f & ADDRF_NOLOG))
 522     fw_log(-1, "[%s] reattaching listener", ss->s.desc);
 523
 524   /* --- Make the socket --- */
 525
 526   if ((fd = ss->a->ops->bind(ss->a, ss->ao)) < 0) {
 527     fw_log(-1, "[%s] couldn't create socket: %s",
 528            ss->s.desc, strerror(errno));
 529     goto fail_0;
 530   }
 531
 532   /* --- Set it to listen for connections --- */
 533
 534   setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
 535   fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
 536   if (listen(fd, ss->o.listen)) {
 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   int opt = 1;
 567
 568   ss->t = t;
 569
 570   /* --- Initialize the description string --- */
 571
 572   {
 573     dstr d = DSTR_INIT;
 574     dstr_puts(&d, "socket.");
 575     ss->a->ops->print(ss->a, ADDR_SRC, &d);
 576     dstr_puts(&d, " -> ");
 577     dstr_puts(&d, ss->t->desc);
 578     ss->s.desc = xstrdup(d.buf);
 579     dstr_destroy(&d);
 580   }
 581
 582   /* --- Confirm the address --- */
 583
 584   if (ss->a->ops->confirm)
 585     ss->a->ops->confirm(ss->a, ADDR_SRC, ss->ao);
 586
 587   /* --- Initialize the socket for listening --- */
 588
 589   if ((fd = ss->a->ops->bind(ss->a, ss->ao)) < 0)
 590     error(sc, "couldn't bind socket `%s': %s", ss->s.desc, strerror(errno));
 591
 592   /* --- Set it to listen for connections --- */
 593
 594   setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
 595   fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
 596   if (listen(fd, ss->o.listen)) {
 597     error(sc, "couldn't listen on socket `%s': %s",
 598           ss->s.desc, strerror(errno));
 599   }
 600
 601   /* --- We're ready to go now --- */
 602
 603   sel_initfile(sel, &ss->r, fd, SEL_READ, ss_accept, ss);
 604   sel_addfile(&ss->r);
 605   source_add(&ss->s);
 606   fw_inc();
 607 }
 608
 609 /* --- @destroy@ --- */
 610
 611 static void ssource_destroy(source *s)
 612 {
 613   ssource *ss = (ssource *)s;
 614
 615   if (ss->o.conn || ss->o.opt != SOCKOPT_LIMIT) {
 616     sel_rmfile(&ss->r);
 617     close(ss->r.fd);
 618     if (ss->a->ops->unbind)
 619       ss->a->ops->unbind(ss->a);
 620   }
 621   if (ss->a->ops->freesrcopts)
 622     ss->a->ops->freesrcopts(ss->ao);
 623   else
 624     DESTROY(ss->ao);
 625   xfree(ss->s.desc);
 626   ss->a->ops->destroy(ss->a);
 627   ss->t->ops->destroy(ss->t);
 628   source_remove(&ss->s);
 629   DESTROY(ss);
 630   fw_dec();
 631 }
 632
 633 /* --- Source definition block --- */
 634
 635 source_ops ssource_ops = {
 636   "socket",
 637   ssource_option, ssource_read, ssource_attach, ssource_destroy
 638 };
 639
 640 /*----- Target definition -------------------------------------------------*/
 641
 642 /* --- @options@ --- */
 643
 644 static int starget_option(target *t, scanner *sc)
 645 {
 646   starget *st = (starget *)t;
 647
 648   CONF_BEGIN(sc, "starget", "socket target")
 649
 650   /* --- Pass the option around the various address types --- */
 651
 652   if (st) {
 653     if (st->a->ops->option && st->a->ops->option(sc, st->ao, ADDR_DEST))
 654       CONF_ACCEPT;
 655   }
 656   /* We'd have done it already if it was global */
 657
 658   /* --- Done --- */
 659
 660   CONF_END;
 661 }
 662
 663 /* --- @read@ --- */
 664
 665 static target *starget_read(scanner *sc)
 666 {
 667   starget *st;
 668   dstr d = DSTR_INIT;
 669
 670   (void)(conf_prefix(sc, "socket") || conf_prefix(sc, "sk"));
 671   st = CREATE(starget);
 672   st->t.ops = &starget_ops;
 673   st->a = getaddr(sc, ADDR_DEST);
 674   if (st->a->ops->inittargopts)
 675     st->ao = st->a->ops->inittargopts();
 676   else
 677     st->ao = CREATE(addr_opts);
 678   *st->ao = gtao;
 679   dstr_puts(&d, "socket.");
 680   st->a->ops->print(st->a, ADDR_DEST, &d);
 681   st->t.desc = xstrdup(d.buf);
 682   dstr_destroy(&d);
 683   return (&st->t);
 684 }
 685
 686 /* --- @confirm@ --- */
 687
 688 static void starget_confirm(target *t)
 689 {
 690   starget *st = (starget *)t;
 691
 692   if (st->a->ops->confirm)
 693     st->a->ops->confirm(st->a, ADDR_DEST, st->ao);
 694 }
 695
 696 /* --- @create@ --- */
 697
 698 static endpt *starget_create(target *t, const char *desc)
 699 {
 700   starget *st = (starget *)t;
 701   stept *e = CREATE(stept);
 702
 703   e->e.ops = &stept_ops;
 704   e->e.other = 0;
 705   e->e.f = EPF_FILE | EPF_PENDING;
 706   e->e.t = 0;
 707   e->desc = xstrdup(desc);
 708   if (st->a->ops->connect(st->a, st->ao, &e->c, &e->e)) {
 709     fw_log(-1, "[%s] couldn't connect: %s", e->desc, strerror(errno));
 710     DESTROY(e);
 711     return (0);
 712   }
 713   fw_inc();
 714   return (&e->e);
 715 }
 716
 717 /* --- @destroy@ --- */
 718
 719 static void starget_destroy(target *t)
 720 {
 721   starget *st = (starget *)t;
 722   if (st->a->ops->freetargopts)
 723     st->a->ops->freetargopts(st->ao);
 724   else
 725     DESTROY(st->ao);
 726   st->a->ops->destroy(st->a);
 727   xfree(st->t.desc);
 728   DESTROY(st);
 729 }
 730
 731 /* --- Socket target definition block --- */
 732
 733 target_ops starget_ops = {
 734   "socket",
 735   starget_option, starget_read, starget_confirm,
 736   starget_create, starget_destroy
 737 };
 738
 739 /*----- That's all, folks -------------------------------------------------*/