mdw@git.distorted.org.uk Git - tripe/blob - admin.c

   1 /* -*-c-*-
   2  *
   3  * $Id$
   4  *
   5  * Admin interface for configuration
   6  *
   7  * (c) 2001 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Trivial IP Encryption (TrIPE).
  13  *
  14  * TrIPE 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  * TrIPE 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 TrIPE; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Header files ------------------------------------------------------*/
  30
  31 #include "tripe.h"
  32
  33 /*----- Global variables --------------------------------------------------*/
  34
  35 #ifndef NTRACE
  36
  37 const trace_opt tr_opts[] = {
  38   { 't',        T_TUNNEL,       "tunnel events" },
  39   { 'r',        T_PEER,         "peer events" },
  40   { 'a',        T_ADMIN,        "admin interface" },
  41   { 'p',        T_PACKET,       "packet contents" },
  42   { 'c',        T_CRYPTO,       "crypto details" },
  43   { 's',        T_KEYSET,       "symmetric keyset management" },
  44   { 'x',        T_KEYEXCH,      "key exchange" },
  45   { 'm',        T_KEYMGMT,      "key management" },
  46   { 'A',        T_ALL,          "all of the above" },
  47   { 0,          0,              0 }
  48 };
  49
  50 unsigned tr_flags = 0;
  51 #endif
  52
  53 static const trace_opt w_opts[] = {
  54   { 't',        AF_TRACE,       "trace messages" },
  55   { 'n',        AF_NOTE,        "asynchronous notifications" },
  56   { 'w',        AF_WARN,        "warnings" },
  57   { 'A',        AF_ALLMSGS,     "all of the above" },
  58   { 0,          0,              0 }
  59 };
  60
  61 /*----- Static variables --------------------------------------------------*/
  62
  63 static admin *admins;
  64 static sel_file sock;
  65 static const char *sockname;
  66 static unsigned flags = 0;
  67 static admin *a_stdin = 0;
  68 static sig s_term, s_int, s_hup;
  69
  70 #define F_DAEMON 1u
  71 #define F_INIT 2u
  72
  73 #define T_RESOLVE SEC(30)
  74 #define T_PING SEC(5)
  75
  76 static void a_destroy(admin */*a*/);
  77 static void a_lock(admin */*a*/);
  78 static void a_unlock(admin */*a*/);
  79
  80 #define BOOL(x) ((x) ? "t" : "nil")
  81
  82 /*----- Output functions --------------------------------------------------*/
  83
  84 /* --- @trywrite@ --- *
  85  *
  86  * Arguments:   @admin *a@ = pointer to an admin block
  87  *              @const char *p@ = pointer to buffer to write
  88  *              @size_t sz@ = size of data to write
  89  *
  90  * Returns:     The number of bytes written, or less than zero on error.
  91  *
  92  * Use:         Attempts to write data to a client.
  93  */
  94
  95 static ssize_t trywrite(admin *a, const char *p, size_t sz)
  96 {
  97   ssize_t n, done = 0;
  98
  99 again:
 100   if (!sz)
 101     return (done);
 102   n = write(a->w.fd, p, sz);
 103   if (n > 0) {
 104     done += n;
 105     p += n;
 106     sz -= n;
 107     goto again;
 108   }
 109   if (n < 0) {
 110     if (errno == EINTR)
 111       goto again;
 112     if (errno != EAGAIN && errno != EWOULDBLOCK) {
 113       a_destroy(a);
 114       a_warn("ADMIN client-read-error -- %s", strerror(errno));
 115       return (-1);
 116     }
 117   }
 118   return (done);
 119 }
 120
 121 /* --- @doqueue@ -- *
 122  *
 123  * Arguments:   @oqueue *q@ = pointer to output queue
 124  *              @const char *p@ = pointer to buffer to write
 125  *              @size_t sz@ = size of buffer
 126  *
 127  * Returns:     Nonzero if the queue was previously empty.
 128  *
 129  * Use:         Queues data to be written later.
 130  */
 131
 132 static int doqueue(oqueue *q, const char *p, size_t sz)
 133 {
 134   obuf *o;
 135   int rc = 0;
 136   size_t n;
 137
 138   o = q->tl;
 139   if (!o)
 140     rc = 1;
 141   else if (o->p_in < o->buf + OBUFSZ)
 142     goto noalloc;
 143
 144   do {
 145     o = xmalloc(sizeof(obuf));
 146     o->next = 0;
 147     o->p_in = o->p_out = o->buf;
 148     if (q->tl)
 149       q->tl->next = o;
 150     else
 151       q->hd = o;
 152     q->tl = o;
 153
 154   noalloc:
 155     n = o->buf + OBUFSZ - o->p_in;
 156     if (n > sz)
 157       n = sz;
 158     memcpy(o->p_in, p, n);
 159     o->p_in += n;
 160     p += n;
 161     sz -= n;
 162   } while (sz);
 163
 164   return (rc);
 165 }
 166
 167 /* --- @dosend@ --- *
 168  *
 169  * Arguemnts:   @admin *a@ = pointer to an admin block
 170  *              @const char *p@ = pointer to buffer to write
 171  *              @size_t sz@ = size of data to write
 172  *
 173  * Returns:     ---
 174  *
 175  * Use:         Sends data to an admin client.
 176  */
 177
 178 static void dosend(admin *a, const char *p, size_t sz)
 179 {
 180   ssize_t n;
 181
 182   if (a->f & AF_DEAD)
 183     return;
 184   if (!a->out.hd) {
 185     if ((n = trywrite(a, p, sz)) < 0)
 186       return;
 187     p += n;
 188     sz -= n;
 189     if (!sz)
 190       return;
 191   }
 192   if (doqueue(&a->out, p, sz))
 193     sel_addfile(&a->w);
 194 }
 195
 196 /* --- @a_flush@ --- *
 197  *
 198  * Arguments:   @int fd@ = file descriptor
 199  *              @unsigned mode@ = what's happening
 200  *              @void *v@ = pointer to my admin block
 201  *
 202  * Returns:     ---
 203  *
 204  * Use:         Flushes buffers when a client is ready to read again.
 205  */
 206
 207 static void a_flush(int fd, unsigned mode, void *v)
 208 {
 209   admin *a = v;
 210   obuf *o, *oo;
 211   ssize_t n;
 212
 213   o = a->out.hd;
 214   while (o) {
 215     if ((n = trywrite(a, o->p_out, o->p_in - o->p_out)) < 0)
 216       return;
 217     o->p_out += n;
 218     if (o->p_in < o->p_out)
 219       break;
 220     oo = o;
 221     o = o->next;
 222     xfree(oo);
 223   }
 224   a->out.hd = o;
 225   if (!o) {
 226     a->out.tl = 0;
 227     sel_rmfile(&a->w);
 228   }
 229 }
 230
 231 /*----- Utility functions -------------------------------------------------*/
 232
 233 /* --- @a_write@, @a_vwrite@ --- *
 234  *
 235  * Arguments:   @admin *a@ = admin connection to write to
 236  *              @const char *status@ = status code to report
 237  *              @const char *tag@ = tag string, or null
 238  *              @const char *fmt@ = pointer to format string
 239  *              @va_list ap@ = arguments in list
 240  *              @...@ = other arguments
 241  *
 242  * Returns:     ---
 243  *
 244  * Use:         Sends a message to an admin connection.
 245  */
 246
 247 static void a_vwrite(admin *a, const char *status, const char *tag,
 248                      const char *fmt, va_list ap)
 249 {
 250   dstr d = DSTR_INIT;
 251
 252   if (tag) dstr_puts(&d, "BG");
 253   dstr_puts(&d, status);
 254   if (tag) {
 255     dstr_putc(&d, ' ');
 256     dstr_puts(&d, tag);
 257   }
 258   if (fmt) {
 259     dstr_putc(&d, ' ');
 260     dstr_vputf(&d, fmt, &ap);
 261   }
 262   dstr_putc(&d, '\n');
 263   dosend(a, d.buf, d.len);
 264   dstr_destroy(&d);
 265 }
 266
 267 static void a_write(admin *a, const char *status, const char *tag,
 268                     const char *fmt, ...)
 269 {
 270   va_list ap;
 271   va_start(ap, fmt);
 272   a_vwrite(a, status, tag, fmt, ap);
 273   va_end(ap);
 274 }
 275
 276 /* --- @a_ok@, @a_info@, @a_fail@ --- *
 277  *
 278  * Arguments:   @admin *a@ = connection
 279  *              @const char *fmt@ = format string
 280  *              @...@ = other arguments
 281  *
 282  * Returns:     ---
 283  *
 284  * Use:         Convenience functions for @a_write@.
 285  */
 286
 287 static void a_ok(admin *a) { a_write(a, "OK", 0, 0); }
 288
 289 static void a_info(admin *a, const char *fmt, ...)
 290 {
 291   va_list ap;
 292   va_start(ap, fmt);
 293   a_vwrite(a, "INFO", 0, fmt, ap);
 294   va_end(ap);
 295 }
 296
 297 static void a_fail(admin *a, const char *fmt, ...)
 298 {
 299   va_list ap;
 300   va_start(ap, fmt);
 301   a_vwrite(a, "FAIL", 0, fmt, ap);
 302   va_end(ap);
 303 }
 304
 305 /* --- @a_alert@, @a_valert@, @a_rawalert@ --- *
 306  *
 307  * Arguments:   @unsigned f_and, f_eq@ = filter for connections
 308  *              @const char *status@ = status string
 309  *              @const char *fmt@ = pointer to format string
 310  *              @const char *p@ = pointer to raw string
 311  *              @size_t sz@ = size of raw string
 312  *              @va_list ap@ = arguments in list
 313  *              @...@ = other arguments
 314  *
 315  * Returns:     ---
 316  *
 317  * Use:         Write a message to all admin connections matched by the given
 318  *              filter.
 319  */
 320
 321 static void a_rawalert(unsigned f_and, unsigned f_eq, const char *status,
 322                        const char *p, size_t sz)
 323 {
 324   admin *a, *aa;
 325   dstr d = DSTR_INIT;
 326
 327   if (!(flags & F_INIT))
 328     return;
 329   dstr_puts(&d, status);
 330   if (p) {
 331     dstr_putc(&d, ' ');
 332     dstr_putm(&d, p, sz);
 333   }
 334   dstr_putc(&d, '\n');
 335   p = d.buf;
 336   sz = d.len;
 337   for (a = admins; a; a = aa) {
 338     aa = a->next;
 339     if ((a->f & f_and) == f_eq)
 340       dosend(a, d.buf, d.len);
 341   }
 342   dstr_destroy(&d);
 343 }
 344
 345 static void a_valert(unsigned f_and, unsigned f_eq, const char *tag,
 346                      const char *fmt, va_list ap)
 347 {
 348   dstr d = DSTR_INIT;
 349
 350   if (!(flags & F_INIT))
 351     return;
 352   if (fmt)
 353     dstr_vputf(&d, fmt, &ap);
 354   a_rawalert(f_and, f_eq, tag, fmt ? d.buf : 0, fmt ? d.len : 0);
 355   dstr_destroy(&d);
 356 }
 357
 358 #if 0 /*unused*/
 359 static void a_alert(unsigned f_and, unsigned f_eq, const char *tag,
 360                     const char *fmt, ...)
 361 {
 362   va_list ap;
 363   va_start(ap, fmt);
 364   a_valert(f_and, f_eq, tag, fmt, ap);
 365   va_end(ap);
 366 }
 367 #endif
 368
 369 /* --- @a_warn@ --- *
 370  *
 371  * Arguments:   @const char *fmt@ = pointer to format string
 372  *              @...@ = other arguments
 373  *
 374  * Returns:     ---
 375  *
 376  * Use:         Informs all admin connections of a warning.
 377  */
 378
 379 void a_warn(const char *fmt, ...)
 380 {
 381   va_list ap;
 382
 383   va_start(ap, fmt);
 384   if (flags & F_INIT)
 385     a_valert(0, 0, "WARN", fmt, ap);
 386   else {
 387     fprintf(stderr, "%s: ", QUIS);
 388     vfprintf(stderr, fmt, ap);
 389     fputc('\n', stderr);
 390   }
 391   va_end(ap);
 392 }
 393
 394 /* --- @a_trace@ --- *
 395  *
 396  * Arguments:   @const char *p@ = pointer to a buffer
 397  *              @size_t sz@ = size of the buffer
 398  *              @void *v@ = uninteresting pointer
 399  *
 400  * Returns:     ---
 401  *
 402  * Use:         Custom trace output handler.  Sends trace messages to
 403  *              interested admin connections.
 404  */
 405
 406 #ifndef NTRACE
 407 static void a_trace(const char *p, size_t sz, void *v)
 408   { a_rawalert(AF_TRACE, AF_TRACE, "TRACE", p, sz); }
 409 #endif
 410
 411 /* --- @a_notify@ --- *
 412  *
 413  * Arguments:   @const char *fmt@ = pointer to format string
 414  *              @...@ = other arguments
 415  *
 416  * Returns:     ---
 417  *
 418  * Use:         Sends a notification to interested admin connections.
 419  */
 420
 421 void a_notify(const char *fmt, ...)
 422 {
 423   va_list ap;
 424
 425   va_start(ap, fmt);
 426   a_valert(AF_NOTE, AF_NOTE, "NOTE", fmt, ap);
 427   va_end(ap);
 428 }
 429
 430 /* --- @a_quit@ --- *
 431  *
 432  * Arguments:   ---
 433  *
 434  * Returns:     ---
 435  *
 436  * Use:         Shuts things down nicely.
 437  */
 438
 439 void a_quit(void)
 440 {
 441   peer *p;
 442
 443   close(sock.fd);
 444   unlink(sockname);
 445   while ((p = p_first()) != 0)
 446     p_destroy(p);
 447   exit(0);
 448 }
 449
 450 /* --- @a_sigdie@ --- *
 451  *
 452  * Arguments:   @int sig@ = signal number
 453  *              @void *v@ = an uninteresting argument
 454  *
 455  * Returns:     ---
 456  *
 457  * Use          Shuts down on receipt of a fatal signal.
 458  */
 459
 460 static void a_sigdie(int sig, void *v)
 461 {
 462   char *p;
 463   char buf[20];
 464
 465   switch (sig) {
 466     case SIGTERM:       p = "SIGTERM"; break;
 467     case SIGINT:        p = "SIGINT"; break;
 468     default:
 469       sprintf(buf, "%i", sig);
 470       p = buf;
 471       break;
 472   }
 473   a_warn("SERVER quit signal %s", p);
 474   a_quit();
 475 }
 476
 477 /* --- @a_sighup@ --- *
 478  *
 479  * Arguments:   @int sig@ = signal number
 480  *              @void *v@ = an uninteresting argument
 481  *
 482  * Returns:     ---
 483  *
 484  * Use          Logs a message about SIGHUP not being useful.
 485  */
 486
 487 static void a_sighup(int sig, void *v)
 488 {
 489   a_warn("SERVER ignore signal SIGHUP");
 490 }
 491
 492 /* --- @a_parsetime@ --- *
 493  *
 494  * Arguments;   @const char *p@ = time string to parse
 495  *
 496  * Returns:     Time in seconds, or @< 0@ on error.
 497  */
 498
 499 static long a_parsetime(const char *p)
 500 {
 501   char *q;
 502   long t = strtol(p, &q, 0);
 503
 504   switch (*q) {
 505     case 'd': t *= 24;
 506     case 'h': t *= 60;
 507     case 'm': t *= 60;
 508     case 's': if (q[1] != 0)
 509     default:    t = -1;
 510     case 0:   break;
 511   }
 512   return (t);
 513 }
 514
 515 /*----- Backgrounded operations -------------------------------------------*/
 516
 517 #define BGTAG(bg)                                                       \
 518   (((admin_bgop *)(bg))->tag ? ((admin_bgop *)(bg))->tag : "<foreground>")
 519
 520 /* --- @a_bgrelease@ --- *
 521  *
 522  * Arguments:   @admin_bgop *bg@ = backgrounded operation
 523  *
 524  * Returns:     ---
 525  *
 526  * Use:         Removes a backgrounded operation from the queue, since
 527  *              (presumably) it's done.
 528  */
 529
 530 static void a_bgrelease(admin_bgop *bg)
 531 {
 532   admin *a = bg->a;
 533
 534   T( trace(T_ADMIN, "admin: release bgop %s", BGTAG(bg)); )
 535   if (bg->tag) xfree(bg->tag);
 536   else selbuf_enable(&a->b);
 537   if (bg->next) bg->next->prev = bg->prev;
 538   if (bg->prev) bg->prev->next = bg->next;
 539   else a->bg = bg->next;
 540   xfree(bg);
 541   if (a->f & AF_CLOSE) a_destroy(a);
 542   a_unlock(a);
 543 }
 544
 545 /* --- @a_bgok@, @a_bginfo@, @a_bgfail@ --- *
 546  *
 547  * Arguments:   @admin_bgop *bg@ = backgrounded operation
 548  *              @const char *fmt@ = format string
 549  *              @...@ = other arguments
 550  *
 551  * Returns:     ---
 552  *
 553  * Use:         Convenience functions for @a_write@.
 554  */
 555
 556 static void a_bgok(admin_bgop *bg)
 557   { a_write(bg->a, "OK", bg->tag, 0); }
 558
 559 static void a_bginfo(admin_bgop *bg, const char *fmt, ...)
 560 {
 561   va_list ap;
 562   va_start(ap, fmt);
 563   a_vwrite(bg->a, "INFO", bg->tag, fmt, ap);
 564   va_end(ap);
 565 }
 566
 567 static void a_bgfail(admin_bgop *bg, const char *fmt, ...)
 568 {
 569   va_list ap;
 570   va_start(ap, fmt);
 571   a_vwrite(bg->a, "FAIL", bg->tag, fmt, ap);
 572   va_end(ap);
 573 }
 574
 575 /* --- @a_bgadd@ --- *
 576  *
 577  * Arguments:   @admin *a@ = administration connection
 578  *              @admin_bgop *bg@ = pointer to background operation
 579  *              @const char *tag@ = background tag, or null for foreground
 580  *              @void (*cancel)(admin_bgop *)@ = cancel function
 581  *
 582  * Returns:     ---
 583  *
 584  * Use:         Links a background job into the list.
 585  */
 586
 587 static void a_bgadd(admin *a, admin_bgop *bg, const char *tag,
 588                     void (*cancel)(admin_bgop *))
 589 {
 590   if (tag)
 591     bg->tag = xstrdup(tag);
 592   else {
 593     bg->tag = 0;
 594     selbuf_disable(&a->b);
 595   }
 596   bg->a = a;
 597   bg->cancel = cancel;
 598   bg->next = a->bg;
 599   bg->prev = 0;
 600   if (a->bg) a->bg->prev = bg;
 601   a->bg = bg;
 602   a_lock(a);
 603   T( trace(T_ADMIN, "admin: add bgop %s", BGTAG(bg)); )
 604   if (tag) a_write(a, "DETACH", tag, 0);
 605 }
 606
 607 /*----- Adding peers ------------------------------------------------------*/
 608
 609 /* --- @a_addfree@ --- *
 610  *
 611  * Arguments:   @admin_addop *add@ = operation block
 612  *
 613  * Returns:     ---
 614  *
 615  * Use:         Frees an add operation.
 616  */
 617
 618 static void a_addfree(admin_addop *add)
 619 {
 620   T( trace(T_ADMIN, "admin: free add op %s", BGTAG(add)); )
 621   if (add->peer.name) xfree(add->peer.name);
 622   if (add->paddr) xfree(add->paddr);
 623 }
 624
 625 /* --- @a_addcancel@ --- *
 626  *
 627  * Arguments:   @admin_bgop *bg@ = background operation
 628  *
 629  * Returns:     ---
 630  *
 631  * Use:         Cancels an add operation.
 632  */
 633
 634 static void a_addcancel(admin_bgop *bg)
 635 {
 636   admin_addop *add = (admin_addop *)bg;
 637
 638   T( trace(T_ADMIN, "admin: cancel add op %s", BGTAG(add)); )
 639   sel_rmtimer(&add->t);
 640   bres_abort(&add->r);
 641   a_addfree(add);
 642 }
 643
 644 /* --- @a_doadd@ --- *
 645  *
 646  * Arguments:   @admin_addop *add@ = operation block
 647  *
 648  * Returns:     ---
 649  *
 650  * Use:         Does the peer add thing.
 651  */
 652
 653 static void a_doadd(admin_addop *add)
 654 {
 655   if (p_find(add->peer.name))
 656     a_bgfail(&add->bg, "peer-exists %s", add->peer.name);
 657   else if (!p_create(&add->peer))
 658     a_bgfail(&add->bg, "peer-create-fail %s", add->peer.name);
 659   else
 660     a_bgok(&add->bg);
 661 }
 662
 663 /* --- @a_addresolve@ --- *
 664  *
 665  * Arguments:   @struct hostent *h@ = pointer to resolved hostname
 666  *              @void *v@ = pointer to add operation
 667  *
 668  * Returns:     ---
 669  *
 670  * Use:         Handles a completed name resolution.
 671  */
 672
 673 static void a_addresolve(struct hostent *h, void *v)
 674 {
 675   admin_addop *add = v;
 676
 677   T( trace(T_ADMIN, "admin: add op %s resolved", BGTAG(add)); )
 678   TIMER;
 679   if (!h)
 680     a_bgfail(&add->bg, "resolve-error %s", add->paddr);
 681   else {
 682     memcpy(&add->peer.sa.sin.sin_addr, h->h_addr, sizeof(struct in_addr));
 683     a_doadd(add);
 684   }
 685   sel_rmtimer(&add->t);
 686   a_addfree(add);
 687   a_bgrelease(&add->bg);
 688 }
 689
 690 /* --- @a_addtimer@ --- *
 691  *
 692  * Arguments:   @struct timeval *tv@ = timer
 693  *              @void *v@ = pointer to add operation
 694  *
 695  * Returns:     ---
 696  *
 697  * Use:         Times out a resolver.
 698  */
 699
 700 static void a_addtimer(struct timeval *tv, void *v)
 701 {
 702   admin_addop *add = v;
 703
 704   T( trace(T_ADMIN, "admin: add op %s timeout", BGTAG(add)); )
 705   a_bgfail(&add->bg, "resolver-timeout %s\n", add->paddr);
 706   bres_abort(&add->r);
 707   a_addfree(add);
 708   a_bgrelease(&add->bg);
 709 }
 710
 711 /* --- @acmd_add@ --- *
 712  *
 713  * Arguments:   @admin *a@ = connection which requested the addition
 714  *              @unsigned ac@ = argument count
 715  *              @char *av[]@ = pointer to the argument list
 716  *
 717  * Returns:     ---
 718  *
 719  * Use:         Adds a new peer.
 720  */
 721
 722 static void acmd_add(admin *a, unsigned ac, char *av[])
 723 {
 724   unsigned long pt;
 725   struct timeval tv;
 726   unsigned i, j;
 727   char *p;
 728   const char *tag = 0;
 729   admin_addop *add = 0;
 730
 731   /* --- Make sure someone's not got there already --- */
 732
 733   if (p_find(av[0])) {
 734     a_fail(a, "peer-exists %s", av[0]);
 735     goto fail;
 736   }
 737
 738   /* --- Set stuff up --- */
 739
 740   add = xmalloc(sizeof(*add));
 741   add->peer.name = xstrdup(av[0]);
 742   add->peer.t_ka = 0;
 743   add->peer.tops = tun_default;
 744   add->paddr = 0;
 745
 746   /* --- Parse options --- */
 747
 748   i = 1;
 749   for (;;) {
 750     if (!av[i])
 751       goto bad_syntax;
 752     if (mystrieq(av[i], "-background")) {
 753       if (!av[++i]) goto bad_syntax;
 754       tag = av[i];
 755     } else if (mystrieq(av[i], "-tunnel")) {
 756       if (!av[++i]) goto bad_syntax;
 757       for (j = 0;; j++) {
 758         if (!tunnels[j]) {
 759           a_fail(a, "unknown-tunnel %s", av[i]);
 760           return;
 761         }
 762         if (mystrieq(av[i], tunnels[j]->name)) {
 763           add->peer.tops = tunnels[j];
 764           break;
 765         }
 766       }
 767     } else if (mystrieq(av[i], "-keepalive")) {
 768       long t;
 769       if (!av[++i]) goto bad_syntax;
 770       if ((t = a_parsetime(av[i])) < 0) {
 771         a_fail(a, "bad-time-spec %s", av[i]);
 772         return;
 773       }
 774       add->peer.t_ka = t;
 775     } else if (mystrieq(av[i], "--")) {
 776       i++;
 777       break;
 778     } else
 779       break;
 780     i++;
 781   }
 782
 783   /* --- Fill in the easy bits of address --- */
 784
 785   if (mystrieq(av[i], "inet")) i++;
 786   if (ac - i != 2) {
 787     a_fail(a, "bad-syntax -- add PEER [OPTIONS] [inet] ADDRESS PORT");
 788     goto fail;
 789   }
 790   add->peer.sa.sin.sin_family = AF_INET;
 791   add->peer.sasz = sizeof(add->peer.sa.sin);
 792   add->paddr = xstrdup(av[i]);
 793   pt = strtoul(av[i + 1], &p, 0);
 794   if (*p) {
 795     struct servent *s = getservbyname(av[i + 1], "udp");
 796     if (!s) {
 797       a_fail(a, "unknown-service %s", av[i + 1]);
 798       goto fail;
 799     }
 800     pt = ntohs(s->s_port);
 801   }
 802   if (pt == 0 || pt >= 65536) {
 803     a_fail(a, "invalid-port %lu", pt);
 804     goto fail;
 805   }
 806   add->peer.sa.sin.sin_port = htons(pt);
 807
 808   /* --- Report backgrounding --- *
 809    *
 810    * Do this for consistency of interface, even if we're going to get the
 811    * answer straight away.
 812    */
 813
 814   a_bgadd(a, &add->bg, tag, a_addcancel);
 815   T( trace(T_ADMIN, "admin: %u, add op %s resolving hostname `%s'",
 816            a->seq, BGTAG(add), add->paddr); )
 817
 818   /* --- If the name is numeric, do it the easy way --- */
 819
 820   if (inet_aton(av[i], &add->peer.sa.sin.sin_addr)) {
 821     T( trace(T_ADMIN, "admin: add op %s done the easy way", BGTAG(add)); )
 822     a_doadd(add);
 823     a_addfree(add);
 824     a_bgrelease(&add->bg);
 825     return;
 826   }
 827
 828   /* --- Store everything for later and crank up the resolver --- */
 829
 830   gettimeofday(&tv, 0);
 831   tv.tv_sec += T_RESOLVE;
 832   sel_addtimer(&sel, &add->t, &tv, a_addtimer, add);
 833   bres_byname(&add->r, add->paddr, a_addresolve, add);
 834   return;
 835
 836 bad_syntax:
 837   a_fail(a, "bad-syntax -- add PEER [OPTIONS] ADDR ...");
 838 fail:
 839   if (add) {
 840     a_addfree(add);
 841     xfree(add);
 842   }
 843   return;
 844 }
 845
 846 /*----- Ping --------------------------------------------------------------*/
 847
 848 /* --- @a_pingcancel@ --- *
 849  *
 850  * Arguments:   @admin_bgop *bg@ = background operation block
 851  *
 852  * Returns:     ---
 853  *
 854  * Use:         Cancels a running ping.
 855  */
 856
 857 static void a_pingcancel(admin_bgop *bg)
 858 {
 859   admin_pingop *pg = (admin_pingop *)bg;
 860   T( trace(T_ADMIN, "admin: cancel ping op %s", BGTAG(pg)); )
 861   p_pingdone(&pg->ping, PING_NONOTIFY);
 862 }
 863
 864 /* --- @a_pong@ --- *
 865  *
 866  * Arguments:   @int rc@ = return code
 867  *              @void *v@ = ping operation block
 868  *
 869  * Returns:     ---
 870  *
 871  * Use:         Collects what happened to a ping message.
 872  */
 873
 874 static void a_pong(int rc, void *v)
 875 {
 876   admin_pingop *pg = v;
 877   struct timeval tv;
 878   double millis;
 879
 880   switch (rc) {
 881     case PING_OK:
 882       gettimeofday(&tv, 0);
 883       tv_sub(&tv, &tv, &pg->pingtime);
 884       millis = (double)tv.tv_sec * 1000 + (double)tv.tv_usec/1000;
 885       a_bginfo(&pg->bg, "ping-ok %.1f", millis);
 886       a_bgok(&pg->bg);
 887       break;
 888     case PING_TIMEOUT:
 889       a_bginfo(&pg->bg, "ping-timeout");
 890       a_bgok(&pg->bg);
 891       break;
 892     case PING_PEERDIED:
 893       a_bginfo(&pg->bg, "ping-peer-died");
 894       a_bgok(&pg->bg);
 895       break;
 896     default:
 897       abort();
 898   }
 899   T( trace(T_ADMIN, "admin: ponged ping op %s", BGTAG(pg)); )
 900   a_bgrelease(&pg->bg);
 901 }
 902
 903 /* --- @acmd_ping@, @acmd_eping@ --- *
 904  *
 905  * Arguments:   @admin *a@ = connection which requested the ping
 906  *              @unsigned ac@ = argument count
 907  *              @char *av[]@ = pointer to the argument list
 908  *
 909  * Returns:     ---
 910  *
 911  * Use:         Pings a peer.
 912  */
 913
 914 static void a_ping(admin *a, unsigned ac, char *av[],
 915                    const char *cmd, unsigned msg)
 916 {
 917   long t = T_PING;
 918   int i;
 919   peer *p;
 920   admin_pingop *pg = 0;
 921   const char *tag = 0;
 922
 923   i = 0;
 924   for (;;) {
 925     if (!av[i])
 926       goto bad_syntax;
 927     if (mystrieq(av[i], "-background")) {
 928       if (!av[++i]) goto bad_syntax;
 929       tag = av[i];
 930     } else if (mystrieq(av[i], "-timeout")) {
 931       if (!av[++i]) goto bad_syntax;
 932       if ((t = a_parsetime(av[i])) < 0) {
 933         a_fail(a, "bad-time-spec %s", av[i]);
 934         return;
 935       }
 936     } else if (mystrieq(av[i], "--")) {
 937       i++;
 938       break;
 939     } else
 940       break;
 941     i++;
 942   }
 943
 944   if (!av[i]) goto bad_syntax;
 945   if ((p = p_find(av[i])) == 0) {
 946     a_fail(a, "unknown-peer %s", av[i]);
 947     return;
 948   }
 949   pg = xmalloc(sizeof(*pg));
 950   gettimeofday(&pg->pingtime, 0);
 951   a_bgadd(a, &pg->bg, tag, a_pingcancel);
 952   T( trace(T_ADMIN, "admin: ping op %s: %s to %s",
 953            BGTAG(pg), cmd, p_name(p)); )
 954   if (p_pingsend(p, &pg->ping, msg, t, a_pong, pg)) {
 955     a_bgfail(&pg->bg, "ping-send-failed");
 956     a_bgrelease(&pg->bg);
 957   }
 958   return;
 959
 960 bad_syntax:
 961   a_fail(a, "bad-syntax -- %s [OPTIONS] PEER", cmd);
 962   return;
 963 }
 964
 965 static void acmd_ping(admin *a, unsigned ac, char *av[])
 966   { a_ping(a, ac, av, "ping", MISC_PING); }
 967 static void acmd_eping(admin *a, unsigned ac, char *av[])
 968   { a_ping(a, ac, av, "eping", MISC_EPING); }
 969
 970 /*----- Administration commands -------------------------------------------*/
 971
 972 /* --- Miscellaneous commands --- */
 973
 974 /* --- @traceish@ --- *
 975  *
 976  * Arguments:   @admin *a@ = connection to complain on
 977  *              @unsigned ac@ = number of arguments
 978  *              @char *av[]@ = vector of arguments
 979  *              @const char *what@ = what we're messing with
 980  *              @const trace_opt *tt@ = options table
 981  *              @unsigned *ff@ = where the flags are
 982  *
 983  * Returns:     Nonzero if anything changed.
 984  *
 985  * Use:         Guts of trace-ish commands like `trace' and `watch'.
 986  */
 987
 988 static int traceish(admin *a, unsigned ac, char *av[],
 989                     const char *what, const trace_opt *tt, unsigned *ff)
 990 {
 991   int ch = 0;
 992
 993   if (!ac || strcmp(av[0], "?") == 0) {
 994     const trace_opt *t;
 995     for (t = tt; t->ch; t++) {
 996       a_info(a, "%c%c %s",
 997              t->ch, (*ff & t->f) == t->f ? '+' : ' ', t->help);
 998     }
 999   } else {
1000     unsigned sense = 1;
1001     unsigned f = *ff;
1002     const trace_opt *t;
1003     char *p = av[0];
1004
1005     while (*p) {
1006       switch (*p) {
1007         case '+': sense = 1; break;
1008         case '-': sense = 0; break;
1009         default:
1010           for (t = tt; t->ch; t++) {
1011             if (t->ch == *p) {
1012               if (sense) f |= t->f;
1013               else f &= ~t->f;
1014               goto tropt_ok;
1015             }
1016           }
1017           a_fail(a, "bad-%s-option %c", what, *p);
1018           return (0);
1019         tropt_ok:;
1020           break;
1021       }
1022       p++;
1023     }
1024     *ff = f;
1025     ch = 1;
1026   }
1027   a_ok(a);
1028   return (ch);
1029 }
1030
1031 #ifndef NTRACE
1032
1033 static void acmd_trace(admin *a, unsigned ac, char *av[])
1034 {
1035   if (traceish(a, ac, av, "trace", tr_opts, &tr_flags))
1036     trace_level(tr_flags);
1037 }
1038
1039 #endif
1040
1041 static void acmd_watch(admin *a, unsigned ac, char *av[])
1042 {
1043   traceish(a, ac, av, "watch", w_opts, &a->f);
1044 }
1045
1046 static void quotify(dstr *d, const char *p)
1047 {
1048   if (d->len)
1049     dstr_putc(d, ' ');
1050   if (*p && !p[strcspn(p, "\"' \t\n\v")])
1051     dstr_puts(d, p);
1052   else {
1053     dstr_putc(d, '\"');
1054     while (*p) {
1055       if (*p == '\\' || *p == '\"')
1056         dstr_putc(d, '\\');
1057       dstr_putc(d, *p++);
1058     }
1059     dstr_putc(d, '\"');
1060   }
1061 }
1062
1063 static void alertcmd(admin *a, unsigned f_and, unsigned f_eq,
1064                      const char *tag, unsigned ac, char *av[])
1065 {
1066   dstr d = DSTR_INIT;
1067   unsigned i;
1068
1069   dstr_puts(&d, "USER");
1070   for (i = 0; i < ac; i++)
1071     quotify(&d, av[i]);
1072   dstr_putz(&d);
1073   a_rawalert(f_and, f_eq, tag, d.buf, d.len);
1074   dstr_destroy(&d);
1075   a_ok(a);
1076 }
1077
1078 static void acmd_notify(admin *a, unsigned ac, char *av[])
1079   { alertcmd(a, AF_NOTE, AF_NOTE, "NOTE", ac, av); }
1080 static void acmd_warn(admin *a, unsigned ac, char *av[])
1081   { alertcmd(a, AF_WARN, AF_WARN, "WARN", ac, av); }
1082
1083 static void acmd_port(admin *a, unsigned ac, char *av[])
1084 {
1085   a_info(a, "%u", p_port());
1086   a_ok(a);
1087 }
1088
1089 static void acmd_daemon(admin *a, unsigned ac, char *av[])
1090 {
1091   if (flags & F_DAEMON)
1092     a_fail(a, "already-daemon");
1093   else {
1094     a_notify("DAEMON");
1095     if (a_stdin)
1096       a_destroy(a_stdin);
1097     if (u_daemon())
1098       a_fail(a, "daemon-error -- %s", strerror(errno));
1099     else {
1100       flags |= F_DAEMON;
1101       a_ok(a);
1102     }
1103   }
1104 }
1105
1106 static void acmd_list(admin *a, unsigned ac, char *av[])
1107 {
1108   peer *p;
1109   for (p = p_first(); p; p = p_next(p))
1110     a_info(a, "%s", p_name(p));
1111   a_ok(a);
1112 }
1113
1114 static void acmd_ifname(admin *a, unsigned ac, char *av[])
1115 {
1116   peer *p;
1117
1118   if ((p = p_find(av[0])) == 0)
1119     a_fail(a, "unknown-peer %s", av[0]);
1120   else {
1121     a_info(a, "%s", p_ifname(p));
1122     a_ok(a);
1123   }
1124 }
1125
1126 static void acmd_addr(admin *a, unsigned ac, char *av[])
1127 {
1128   peer *p;
1129   const addr *ad;
1130
1131   if ((p = p_find(av[0])) == 0)
1132     a_fail(a, "unknown-peer %s", av[0]);
1133   else {
1134     ad = p_addr(p);
1135     assert(ad->sa.sa_family == AF_INET);
1136     a_info(a, "INET %s %u",
1137             inet_ntoa(ad->sin.sin_addr),
1138             (unsigned)ntohs(ad->sin.sin_port));
1139     a_ok(a);
1140   }
1141 }
1142
1143 static void acmd_peerinfo(admin *a, unsigned ac, char *av[])
1144 {
1145   peer *p;
1146   const peerspec *ps;
1147
1148   if ((p = p_find(av[0])) == 0) {
1149     a_fail(a, "unknown-peer %s", av[0]);
1150     return;
1151   }
1152
1153   ps = p_spec(p);
1154   a_info(a, "tunnel=%s", ps->tops->name);
1155   a_info(a, "keepalive=%lu", ps->t_ka);
1156   a_ok(a);
1157 }
1158
1159 static void acmd_servinfo(admin *a, unsigned ac, char *av[])
1160 {
1161   a_info(a, "implementation=edgeware-tripe");
1162   a_info(a, "version=%s", VERSION);
1163   a_info(a, "daemon=%s", BOOL(flags & F_DAEMON));
1164   a_ok(a);
1165 }
1166
1167 static void acmd_stats(admin *a, unsigned ac, char *av[])
1168 {
1169   peer *p;
1170   stats *st;
1171
1172   if ((p = p_find(av[0])) == 0) {
1173     a_fail(a, "unknown-peer %s", av[0]);
1174     return;
1175   }
1176
1177   st = p_stats(p);
1178   a_info(a, "start-time=%s", timestr(st->t_start));
1179   a_info(a, "last-packet-time=%s", timestr(st->t_last));
1180   a_info(a, "last-keyexch-time=%s", timestr(st->t_kx));
1181   a_info(a, "packets-in=%lu bytes-in=%lu", st->n_in, st->sz_in);
1182   a_info(a, "packets-out=%lu bytes-out=%lu",
1183          st->n_out, st->sz_out);
1184   a_info(a, "keyexch-packets-in=%lu keyexch-bytes-in=%lu",
1185          st->n_kxin, st->sz_kxin);
1186   a_info(a, "keyexch-packets-out=%lu keyexch-bytes-out=%lu",
1187          st->n_kxout, st->sz_kxout);
1188   a_info(a, "ip-packets-in=%lu ip-bytes-in=%lu",
1189          st->n_ipin, st->sz_ipin);
1190   a_info(a, "ip-packets-out=%lu ip-bytes-out=%lu",
1191          st->n_ipout, st->sz_ipout);
1192   a_info(a, "rejected-packets=%lu", st->n_reject);
1193   a_ok(a);
1194 }
1195
1196 static void acmd_kill(admin *a, unsigned ac, char *av[])
1197 {
1198   peer *p;
1199   if ((p = p_find(av[0])) == 0)
1200     a_fail(a, "unknown-peer %s", av[0]);
1201   else {
1202     p_destroy(p);
1203     a_ok(a);
1204   }
1205 }
1206
1207 static void acmd_forcekx(admin *a, unsigned ac, char *av[])
1208 {
1209   peer *p;
1210   if ((p = p_find(av[0])) == 0)
1211     a_fail(a, "unknown-peer %s", av[0]);
1212   else {
1213     kx_start(&p->kx, 1);
1214     a_ok(a);
1215   }
1216 }
1217
1218 static void acmd_reload(admin *a, unsigned ac, char *av[])
1219   { p_keyreload(); a_ok(a); }
1220
1221 static void acmd_quit(admin *a, unsigned ac, char *av[])
1222 {
1223   a_warn("SERVER quit admin-request");
1224   a_ok(a);
1225   a_unlock(a);
1226   a_quit();
1227 }
1228
1229 static void acmd_version(admin *a, unsigned ac, char *av[])
1230 {
1231   a_info(a, "%s %s", PACKAGE, VERSION);
1232   a_ok(a);
1233 }
1234
1235 static void acmd_tunnels(admin *a, unsigned ac, char *av[])
1236 {
1237   int i;
1238   for (i = 0; tunnels[i]; i++)
1239     a_info(a, "%s", tunnels[i]->name);
1240   a_ok(a);
1241 }
1242
1243 /* --- The command table and help --- */
1244
1245 typedef struct acmd {
1246   const char *name;
1247   const char *help;
1248   unsigned argmin, argmax;
1249   void (*func)(admin */*a*/, unsigned /*ac*/, char */*av*/[]);
1250 } acmd;
1251
1252 static void acmd_help(admin */*a*/, unsigned /*ac*/, char */*av*/[]);
1253
1254 static const acmd acmdtab[] = {
1255   { "add",      "add PEER [OPTIONS] ADDR ...",
1256                                         2,      0xffff, acmd_add },
1257   { "addr",     "addr PEER",            1,      1,      acmd_addr },
1258   { "daemon",   "daemon",               0,      0,      acmd_daemon },
1259   { "eping",    "eping [OPTIONS] PEER", 1,      0xffff, acmd_eping },
1260   { "forcekx",  "forcekx PEER",         1,      1,      acmd_forcekx },
1261   { "help",     "help",                 0,      0,      acmd_help },
1262   { "ifname",   "ifname PEER",          1,      1,      acmd_ifname },
1263   { "kill",     "kill PEER",            1,      1,      acmd_kill },
1264   { "list",     "list",                 0,      0,      acmd_list },
1265   { "notify",   "notify MESSAGE ...",   1,      0xffff, acmd_notify },
1266   { "peerinfo", "peerinfo PEER",        1,      1,      acmd_peerinfo },
1267   { "ping",     "ping [OPTIONS] PEER",  1,      0xffff, acmd_ping },
1268   { "port",     "port",                 0,      0,      acmd_port },
1269   { "quit",     "quit",                 0,      0,      acmd_quit },
1270   { "reload",   "reload",               0,      0,      acmd_reload },
1271   { "servinfo", "servinfo",             0,      0,      acmd_servinfo },
1272   { "stats",    "stats PEER",           1,      1,      acmd_stats },
1273 #ifndef NTRACE
1274   { "trace",    "trace [OPTIONS]",      0,      1,      acmd_trace },
1275 #endif
1276   { "tunnels",  "tunnels",              0,      0,      acmd_tunnels },
1277   { "version",  "version",              0,      0,      acmd_version },
1278   { "warn",     "warn MESSAGE ...",     1,      0xffff, acmd_warn },
1279   { "watch",    "watch [OPTIONS]",      0,      1,      acmd_watch },
1280   { 0,          0,                      0,      0,      0 }
1281 };
1282
1283 static void acmd_help(admin *a, unsigned ac, char *av[])
1284 {
1285   const acmd *c;
1286   for (c = acmdtab; c->name; c++)
1287     a_info(a, "%s", c->help);
1288   a_ok(a);
1289 }
1290
1291 /*----- Connection handling -----------------------------------------------*/
1292
1293 /* --- @a_lock@ --- *
1294  *
1295  * Arguments:   @admin *a@ = pointer to an admin block
1296  *
1297  * Returns:     ---
1298  *
1299  * Use:         Locks an admin block so that it won't be destroyed
1300  *              immediately.
1301  */
1302
1303 static void a_lock(admin *a) { a->ref++; }
1304
1305 /* --- @a_dodestroy@ --- *
1306  *
1307  * Arguments:   @admin *a@ = pointer to an admin block
1308  *
1309  * Returns:     ---
1310  *
1311  * Use:         Actually does the legwork of destroying an admin block.
1312  */
1313
1314 static void a_dodestroy(admin *a)
1315 {
1316   admin_bgop *bg, *bbg;
1317
1318   T( trace(T_ADMIN, "admin: completing destruction of connection %u",
1319            a->seq); )
1320
1321   selbuf_destroy(&a->b);
1322   for (bg = a->bg; bg; bg = bbg) {
1323     bbg = bg->next;
1324     bg->cancel(bg);
1325     if (bg->tag) xfree(bg->tag);
1326     xfree(bg);
1327   }
1328   if (a->b.reader.fd != a->w.fd) close(a->b.reader.fd);
1329   close(a->w.fd);
1330
1331   if (a_stdin == a)
1332     a_stdin = 0;
1333   if (a->next)
1334     a->next->prev = a->prev;
1335   if (a->prev)
1336     a->prev->next = a->next;
1337   else
1338     admins = a->next;
1339   DESTROY(a);
1340 }
1341
1342 /* --- @a_unlock@ --- *
1343  *
1344  * Arguments:   @admin *a@ = pointer to an admin block
1345  *
1346  * Returns:     ---
1347  *
1348  * Use:         Unlocks an admin block, allowing its destruction.  This is
1349  *              also the second half of @a_destroy@.
1350  */
1351
1352 static void a_unlock(admin *a)
1353 {
1354   assert(a->ref);
1355   if (!--a->ref && (a->f & AF_DEAD))
1356     a_dodestroy(a);
1357 }
1358
1359 /* --- @a_destroy@ --- *
1360  *
1361  * Arguments:   @admin *a@ = pointer to an admin block
1362  *
1363  * Returns:     ---
1364  *
1365  * Use:         Destroys an admin block.  This requires a certain amount of
1366  *              care.
1367  */
1368
1369 static void freequeue(oqueue *q)
1370 {
1371   obuf *o, *oo;
1372
1373   for (o = q->hd; o; o = oo) {
1374     oo = o->next;
1375     xfree(o);
1376   }
1377   q->hd = q->tl = 0;
1378 }
1379
1380 static void a_destroy(admin *a)
1381 {
1382   /* --- Don't multiply destroy admin blocks --- */
1383
1384   if (a->f & AF_DEAD)
1385     return;
1386
1387   /* --- Make sure nobody expects it to work --- */
1388
1389   a->f |= AF_DEAD;
1390   T( trace(T_ADMIN, "admin: destroying connection %u", a->seq); )
1391
1392   /* --- Free the output buffers --- */
1393
1394   if (a->out.hd)
1395     sel_rmfile(&a->w);
1396   freequeue(&a->out);
1397
1398   /* --- If the block is locked, that's all we can manage --- */
1399
1400   if (!a->ref)
1401     a_dodestroy(a);
1402   T( else
1403      trace(T_ADMIN, "admin: deferring destruction..."); )
1404 }
1405
1406 /* --- @a_line@ --- *
1407  *
1408  * Arguments:   @char *p@ = pointer to the line read
1409  *              @size_t len@ = length of the line
1410  *              @void *vp@ = pointer to my admin block
1411  *
1412  * Returns:     ---
1413  *
1414  * Use:         Handles a line of input.
1415  */
1416
1417 static void a_line(char *p, size_t len, void *vp)
1418 {
1419   admin *a = vp;
1420   const acmd *c;
1421   char *av[16];
1422   size_t ac;
1423
1424   TIMER;
1425   if (a->f & AF_DEAD)
1426     return;
1427   if (!p) {
1428     if (!a->bg)
1429       a_destroy(a);
1430     else {
1431       a->f |= AF_CLOSE;
1432       selbuf_disable(&a->b);
1433     }
1434     return;
1435   }
1436   ac = str_qsplit(p, av, 16, 0, STRF_QUOTE);
1437   if (!ac)
1438     return;
1439   for (c = acmdtab; c->name; c++) {
1440     if (mystrieq(av[0], c->name)) {
1441       ac--;
1442       if (c->argmin > ac || ac > c->argmax)
1443         a_fail(a, "bad-syntax -- %s", c->help);
1444       else {
1445         a_lock(a);
1446         c->func(a, ac, av + 1);
1447         a_unlock(a);
1448       }
1449       return;
1450     }
1451   }
1452   a_fail(a, "unknown-command %s", av[0]);
1453 }
1454
1455 /* --- @a_create@ --- *
1456  *
1457  * Arguments:   @int fd_in, fd_out@ = file descriptors to use
1458  *              @unsigned f@ = initial flags to set
1459  *
1460  * Returns:     ---
1461  *
1462  * Use:         Creates a new admin connection.
1463  */
1464
1465 void a_create(int fd_in, int fd_out, unsigned f)
1466 {
1467   admin *a = CREATE(admin);
1468
1469   T( static unsigned seq = 0;
1470      a->seq = seq++; )
1471   T( trace(T_ADMIN, "admin: accepted connection %u", a->seq); )
1472   a->bg = 0;
1473   a->f = f;
1474   if (fd_in == STDIN_FILENO) a_stdin = a;
1475   fdflags(fd_in, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
1476   if (fd_out != fd_in)
1477     fdflags(fd_out, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
1478   selbuf_init(&a->b, &sel, fd_in, a_line, a);
1479   sel_initfile(&sel, &a->w, fd_out, SEL_WRITE, a_flush, a);
1480   a->out.hd = a->out.tl = 0;
1481   a->next = admins;
1482   a->prev = 0;
1483   if (admins) admins->prev = a;
1484   admins = a;
1485 }
1486
1487 /* --- @a_accept@ --- *
1488  *
1489  * Arguments:   @int fd@ = file descriptor to accept
1490  *              @unsigned mode@ = what to do
1491  *              @void *v@ = uninteresting pointer
1492  *
1493  * Returns:     ---
1494  *
1495  * Use:         Accepts a new admin connection.
1496  */
1497
1498 static void a_accept(int fd, unsigned mode, void *v)
1499 {
1500   int nfd;
1501   struct sockaddr_un sun;
1502   size_t sz = sizeof(sun);
1503
1504   if ((nfd = accept(fd, (struct sockaddr *)&sun, &sz)) < 0) {
1505     if (errno != EINTR && errno != EAGAIN && errno != EWOULDBLOCK &&
1506         errno != ECONNABORTED && errno != EPROTO)
1507       a_warn("ADMIN accept-error -- %s", strerror(errno));
1508     return;
1509   }
1510   a_create(nfd, nfd, 0);
1511 }
1512
1513 /* --- @a_daemon@ --- *
1514  *
1515  * Arguments:   ---
1516  *
1517  * Returns:     ---
1518  *
1519  * Use:         Informs the admin module that it's a daemon.
1520  */
1521
1522 void a_daemon(void)
1523 {
1524   flags |= F_DAEMON;
1525 }
1526
1527 /* --- @a_init@ --- *
1528  *
1529  * Arguments:   @const char *name@ = socket name to create
1530  *
1531  * Returns:     ---
1532  *
1533  * Use:         Creates the admin listening socket.
1534  */
1535
1536 void a_init(const char *name)
1537 {
1538   int fd;
1539   int n = 5;
1540   struct sockaddr_un sun;
1541   struct sigaction sa;
1542   size_t sz;
1543
1544   /* --- Set up the socket address --- */
1545
1546   sz = strlen(name) + 1;
1547   if (sz > sizeof(sun.sun_path))
1548     die(EXIT_FAILURE, "socket name `%s' too long", name);
1549   BURN(sun);
1550   sun.sun_family = AF_UNIX;
1551   memcpy(sun.sun_path, name, sz);
1552   sz += offsetof(struct sockaddr_un, sun_path);
1553
1554   /* --- Attempt to bind to the socket --- */
1555
1556   umask(0077);
1557 again:
1558   if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1559     die(EXIT_FAILURE, "couldn't create socket: %s", strerror(errno));
1560   if (bind(fd, (struct sockaddr *)&sun, sz) < 0) {
1561     struct stat st;
1562     int e = errno;
1563     if (errno != EADDRINUSE) {
1564       die(EXIT_FAILURE, "couldn't bind to address `%s': %s",
1565           sun.sun_path, strerror(e));
1566     }
1567     if (!n)
1568       die(EXIT_FAILURE, "too many retries; giving up");
1569     n--;
1570     if (!connect(fd, (struct sockaddr *)&sun, sz)) {
1571       die(EXIT_FAILURE, "server already listening on admin socket `%s'",
1572           sun.sun_path);
1573     }
1574     if (errno != ECONNREFUSED)
1575       die(EXIT_FAILURE, "couldn't bind to address: %s", strerror(e));
1576     if (stat(sun.sun_path, &st)) {
1577       die(EXIT_FAILURE, "couldn't stat `%s': %s",
1578           sun.sun_path, strerror(errno));
1579     }
1580     if (!S_ISSOCK(st.st_mode))
1581       die(EXIT_FAILURE, "object `%s' isn't a socket", sun.sun_path);
1582     T( trace(T_ADMIN, "admin: stale socket found; removing it"); )
1583     unlink(sun.sun_path);
1584     close(fd);
1585     goto again;
1586   }
1587   chmod(sun.sun_path, 0600);
1588   fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
1589   if (listen(fd, 5))
1590     die(EXIT_FAILURE, "couldn't listen on socket: %s", strerror(errno));
1591
1592   /* --- Listen to the socket --- */
1593
1594   sel_initfile(&sel, &sock, fd, SEL_READ, a_accept, 0);
1595   sel_addfile(&sock);
1596   sockname = name;
1597   bres_init(&sel);
1598   T( trace_custom(a_trace, 0);
1599      trace(T_ADMIN, "admin: enabled custom tracing"); )
1600   flags |= F_INIT;
1601
1602   /* --- Set up signal handlers --- */
1603
1604   sig_add(&s_term, SIGTERM, a_sigdie, 0);
1605   sig_add(&s_hup, SIGHUP, a_sighup, 0);
1606   signal(SIGPIPE, SIG_IGN);
1607   sigaction(SIGINT, 0, &sa);
1608   if (sa.sa_handler != SIG_IGN)
1609     sig_add(&s_int, SIGINT, a_sigdie, 0);
1610 }
1611
1612 /*----- That's all, folks -------------------------------------------------*/