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