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   { 's',        T_KEYSET,       "symmetric keyset management" },
  42   { 'x',        T_KEYEXCH,      "key exchange" },
  43   { 'm',        T_KEYMGMT,      "key management" },
  44   { 'l',        T_CHAL,         "challenge management" },
  45   { 'p',        T_PACKET,       "packet contents" },
  46   { 'c',        T_CRYPTO,       "crypto details" },
  47   { 'A',        T_ALL,          "all of the above" },
  48   { 0,          0,              0 }
  49 };
  50
  51 unsigned tr_flags = 0;
  52 #endif
  53
  54 static const trace_opt w_opts[] = {
  55   { 't',        AF_TRACE,       "trace messages" },
  56   { 'n',        AF_NOTE,        "asynchronous notifications" },
  57   { 'w',        AF_WARN,        "warnings" },
  58   { 'A',        AF_ALLMSGS,     "all of the above" },
  59   { 0,          0,              0 }
  60 };
  61
  62 /*----- Static variables --------------------------------------------------*/
  63
  64 static admin *admins;
  65 static sel_file sock;
  66 static const char *sockname;
  67 static unsigned flags = 0;
  68 static admin *a_stdin = 0;
  69 static sig s_term, s_int, s_hup;
  70
  71 #define F_DAEMON 1u
  72 #define F_INIT 2u
  73
  74 #define T_RESOLVE SEC(30)
  75 #define T_PING SEC(5)
  76
  77 static void a_destroy(admin */*a*/);
  78 static void a_lock(admin */*a*/);
  79 static void a_unlock(admin */*a*/);
  80
  81 #define BOOL(x) ((x) ? "t" : "nil")
  82
  83 /*----- Output functions --------------------------------------------------*/
  84
  85 /* --- @trywrite@ --- *
  86  *
  87  * Arguments:   @admin *a@ = pointer to an admin block
  88  *              @const char *p@ = pointer to buffer to write
  89  *              @size_t sz@ = size of data to write
  90  *
  91  * Returns:     The number of bytes written, or less than zero on error.
  92  *
  93  * Use:         Attempts to write data to a client.
  94  */
  95
  96 static ssize_t trywrite(admin *a, const char *p, size_t sz)
  97 {
  98   ssize_t n, done = 0;
  99
 100 again:
 101   if (!sz)
 102     return (done);
 103   n = write(a->w.fd, p, sz);
 104   if (n > 0) {
 105     done += n;
 106     p += n;
 107     sz -= n;
 108     goto again;
 109   }
 110   if (n < 0) {
 111     if (errno == EINTR)
 112       goto again;
 113     if (errno != EAGAIN && errno != EWOULDBLOCK) {
 114       a_destroy(a);
 115       a_warn("ADMIN", "client-write-error", "?ERRNO", A_END);
 116       return (-1);
 117     }
 118   }
 119   return (done);
 120 }
 121
 122 /* --- @doqueue@ -- *
 123  *
 124  * Arguments:   @oqueue *q@ = pointer to output queue
 125  *              @const char *p@ = pointer to buffer to write
 126  *              @size_t sz@ = size of buffer
 127  *
 128  * Returns:     Nonzero if the queue was previously empty.
 129  *
 130  * Use:         Queues data to be written later.
 131  */
 132
 133 static int doqueue(oqueue *q, const char *p, size_t sz)
 134 {
 135   obuf *o;
 136   int rc = 0;
 137   size_t n;
 138
 139   o = q->tl;
 140   if (!o)
 141     rc = 1;
 142   else if (o->p_in < o->buf + OBUFSZ)
 143     goto noalloc;
 144
 145   do {
 146     o = xmalloc(sizeof(obuf));
 147     o->next = 0;
 148     o->p_in = o->p_out = o->buf;
 149     if (q->tl)
 150       q->tl->next = o;
 151     else
 152       q->hd = o;
 153     q->tl = o;
 154
 155   noalloc:
 156     n = o->buf + OBUFSZ - o->p_in;
 157     if (n > sz)
 158       n = sz;
 159     memcpy(o->p_in, p, n);
 160     o->p_in += n;
 161     p += n;
 162     sz -= n;
 163   } while (sz);
 164
 165   return (rc);
 166 }
 167
 168 /* --- @dosend@ --- *
 169  *
 170  * Arguemnts:   @admin *a@ = pointer to an admin block
 171  *              @const char *p@ = pointer to buffer to write
 172  *              @size_t sz@ = size of data to write
 173  *
 174  * Returns:     ---
 175  *
 176  * Use:         Sends data to an admin client.
 177  */
 178
 179 static void dosend(admin *a, const char *p, size_t sz)
 180 {
 181   ssize_t n;
 182
 183   if (a->f & AF_DEAD)
 184     return;
 185   if (!a->out.hd) {
 186     if ((n = trywrite(a, p, sz)) < 0)
 187       return;
 188     p += n;
 189     sz -= n;
 190     if (!sz)
 191       return;
 192   }
 193   if (doqueue(&a->out, p, sz))
 194     sel_addfile(&a->w);
 195 }
 196
 197 /* --- @a_flush@ --- *
 198  *
 199  * Arguments:   @int fd@ = file descriptor
 200  *              @unsigned mode@ = what's happening
 201  *              @void *v@ = pointer to my admin block
 202  *
 203  * Returns:     ---
 204  *
 205  * Use:         Flushes buffers when a client is ready to read again.
 206  */
 207
 208 static void a_flush(int fd, unsigned mode, void *v)
 209 {
 210   admin *a = v;
 211   obuf *o, *oo;
 212   ssize_t n;
 213
 214   o = a->out.hd;
 215   while (o) {
 216     if ((n = trywrite(a, o->p_out, o->p_in - o->p_out)) < 0)
 217       return;
 218     o->p_out += n;
 219     if (o->p_in < o->p_out)
 220       break;
 221     oo = o;
 222     o = o->next;
 223     xfree(oo);
 224   }
 225   a->out.hd = o;
 226   if (!o) {
 227     a->out.tl = 0;
 228     sel_rmfile(&a->w);
 229   }
 230 }
 231
 232 /*----- Utility functions -------------------------------------------------*/
 233
 234 /* --- @quotify@ --- *
 235  *
 236  * Arguments:   @dstr *d@ = where to write the answer
 237  *              @const char *p@ = string to quotify
 238  *
 239  * Returns:     ---
 240  *
 241  * Use:         Quotes the given string if necessary, according to our
 242  *              quoting rules.
 243  */
 244
 245 static void quotify(dstr *d, const char *p)
 246 {
 247   if (d->len)
 248     dstr_putc(d, ' ');
 249   if (*p && !p[strcspn(p, "\"' \t\n\v")])
 250     dstr_puts(d, p);
 251   else {
 252     dstr_putc(d, '\"');
 253     while (*p) {
 254       if (*p == '\\' || *p == '\"')
 255         dstr_putc(d, '\\');
 256       dstr_putc(d, *p++);
 257     }
 258     dstr_putc(d, '\"');
 259   }
 260 }
 261
 262 /* --- @a_vformat@ --- *
 263  *
 264  * Arguments:   @dstr *d@ = where to leave the formatted message
 265  *              @const char *fmt@ = pointer to format string
 266  *              @va_list ap@ = arguments in list
 267  *
 268  * Returns:     ---
 269  *
 270  * Use:         Main message token formatting driver.
 271  */
 272
 273 static void a_vformat(dstr *d, const char *fmt, va_list ap)
 274 {
 275   dstr dd = DSTR_INIT;
 276
 277   while (fmt) {
 278     if (*fmt == '*') {
 279       dstr_putc(d, ' ');
 280       dstr_vputf(d, fmt + 1, &ap);
 281     } else if (*fmt == '?') {
 282       if (strcmp(fmt, "?ADDR") == 0) {
 283         const addr *a = va_arg(ap, const addr *);
 284         switch (a->sa.sa_family) {
 285           case AF_INET:
 286             quotify(d, "INET");
 287             quotify(d, inet_ntoa(a->sin.sin_addr));
 288             dstr_putf(d, " %u", (unsigned)ntohs(a->sin.sin_port));
 289             break;
 290           default:
 291             abort();
 292         }
 293       } else if (strcmp(fmt, "?B64") == 0) {
 294         const octet *p = va_arg(ap, const octet *);
 295         size_t n = va_arg(ap, size_t);
 296         base64_ctx b64;
 297         dstr_putc(d, ' ');
 298         base64_init(&b64);
 299         b64.indent = "";
 300         b64.maxline = 0;
 301         base64_encode(&b64, p, n, d);
 302         base64_encode(&b64, 0, 0, d);
 303         while (d->len && d->buf[d->len - 1] == '=') d->len--;
 304       } else if (strcmp(fmt, "?PEER") == 0)
 305         quotify(d, p_name(va_arg(ap, peer *)));
 306       else if (strcmp(fmt, "?ERRNO") == 0) {
 307         dstr_putf(d, " E%d", errno);
 308         quotify(d, strerror(errno));
 309       } else
 310         abort();
 311     } else {
 312       if (*fmt == '!') fmt++;
 313       DRESET(&dd);
 314       dstr_vputf(&dd, fmt, &ap);
 315       quotify(d, dd.buf);
 316     }
 317     fmt = va_arg(ap, const char *);
 318   }
 319
 320   dstr_destroy(&dd);
 321 }
 322
 323 /* --- @a_write@, @a_vwrite@ --- *
 324  *
 325  * Arguments:   @admin *a@ = admin connection to write to
 326  *              @const char *status@ = status code to report
 327  *              @const char *tag@ = tag string, or null
 328  *              @const char *fmt@ = pointer to format string
 329  *              @va_list ap@ = arguments in list
 330  *              @...@ = other arguments
 331  *
 332  * Returns:     ---
 333  *
 334  * Use:         Sends a message to an admin connection.
 335  */
 336
 337 static void a_vwrite(admin *a, const char *status, const char *tag,
 338                      const char *fmt, va_list ap)
 339 {
 340   dstr d = DSTR_INIT;
 341   if (tag) dstr_puts(&d, "BG");
 342   dstr_puts(&d, status);
 343   if (tag) quotify(&d, tag);
 344   a_vformat(&d, fmt, ap);
 345   dstr_putc(&d, '\n');
 346   dosend(a, d.buf, d.len);
 347   dstr_destroy(&d);
 348 }
 349
 350 static void a_write(admin *a, const char *status, const char *tag,
 351                     const char *fmt, ...)
 352 {
 353   va_list ap;
 354   va_start(ap, fmt);
 355   a_vwrite(a, status, tag, fmt, ap);
 356   va_end(ap);
 357 }
 358
 359 /* --- @a_ok@, @a_info@, @a_fail@ --- *
 360  *
 361  * Arguments:   @admin *a@ = connection
 362  *              @const char *fmt@ = format string
 363  *              @...@ = other arguments
 364  *
 365  * Returns:     ---
 366  *
 367  * Use:         Convenience functions for @a_write@.
 368  */
 369
 370 static void a_ok(admin *a) { a_write(a, "OK", 0, A_END); }
 371
 372 static void a_info(admin *a, const char *fmt, ...)
 373 {
 374   va_list ap;
 375   va_start(ap, fmt);
 376   a_vwrite(a, "INFO", 0, fmt, ap);
 377   va_end(ap);
 378 }
 379
 380 static void a_fail(admin *a, const char *fmt, ...)
 381 {
 382   va_list ap;
 383   va_start(ap, fmt);
 384   a_vwrite(a, "FAIL", 0, fmt, ap);
 385   va_end(ap);
 386 }
 387
 388 /* --- @a_alert@, @a_valert@, @a_rawalert@ --- *
 389  *
 390  * Arguments:   @unsigned f_and, f_eq@ = filter for connections
 391  *              @const char *status@ = status string
 392  *              @const char *fmt@ = pointer to format string
 393  *              @const char *p@ = pointer to raw string
 394  *              @size_t sz@ = size of raw string
 395  *              @va_list ap@ = arguments in list
 396  *              @...@ = other arguments
 397  *
 398  * Returns:     ---
 399  *
 400  * Use:         Write a message to all admin connections matched by the given
 401  *              filter.
 402  */
 403
 404 static void a_rawalert(unsigned f_and, unsigned f_eq, const char *status,
 405                        const char *p, size_t sz)
 406 {
 407   admin *a, *aa;
 408   dstr d = DSTR_INIT;
 409
 410   if (!(flags & F_INIT))
 411     return;
 412   dstr_puts(&d, status);
 413   if (p) {
 414     dstr_putc(&d, ' ');
 415     dstr_putm(&d, p, sz);
 416   }
 417   dstr_putc(&d, '\n');
 418   p = d.buf;
 419   sz = d.len;
 420   for (a = admins; a; a = aa) {
 421     aa = a->next;
 422     if ((a->f & f_and) == f_eq)
 423       dosend(a, d.buf, d.len);
 424   }
 425   dstr_destroy(&d);
 426 }
 427
 428 static void a_valert(unsigned f_and, unsigned f_eq, const char *tag,
 429                      const char *fmt, va_list ap)
 430 {
 431   dstr d = DSTR_INIT;
 432
 433   if (!(flags & F_INIT))
 434     return;
 435   a_vformat(&d, fmt, ap);
 436   a_rawalert(f_and, f_eq, tag, fmt ? d.buf : 0, fmt ? d.len : 0);
 437   dstr_destroy(&d);
 438 }
 439
 440 #if 0 /*unused*/
 441 static void a_alert(unsigned f_and, unsigned f_eq, const char *tag,
 442                     const char *fmt, ...)
 443 {
 444   va_list ap;
 445   va_start(ap, fmt);
 446   a_valert(f_and, f_eq, tag, fmt, ap);
 447   va_end(ap);
 448 }
 449 #endif
 450
 451 /* --- @a_warn@ --- *
 452  *
 453  * Arguments:   @const char *fmt@ = pointer to format string
 454  *              @...@ = other arguments
 455  *
 456  * Returns:     ---
 457  *
 458  * Use:         Informs all admin connections of a warning.
 459  */
 460
 461 void a_warn(const char *fmt, ...)
 462 {
 463   va_list ap;
 464
 465   va_start(ap, fmt);
 466   if (flags & F_INIT)
 467     a_valert(0, 0, "WARN", fmt, ap);
 468   else {
 469     dstr d = DSTR_INIT;
 470     fprintf(stderr, "%s: ", QUIS);
 471     a_vformat(&d, fmt, ap);
 472     dstr_putc(&d, '\n');
 473     dstr_write(&d, stderr);
 474     dstr_destroy(&d);
 475   }
 476   va_end(ap);
 477 }
 478
 479 /* --- @a_trace@ --- *
 480  *
 481  * Arguments:   @const char *p@ = pointer to a buffer
 482  *              @size_t sz@ = size of the buffer
 483  *              @void *v@ = uninteresting pointer
 484  *
 485  * Returns:     ---
 486  *
 487  * Use:         Custom trace output handler.  Sends trace messages to
 488  *              interested admin connections.
 489  */
 490
 491 #ifndef NTRACE
 492 static void a_trace(const char *p, size_t sz, void *v)
 493   { a_rawalert(AF_TRACE, AF_TRACE, "TRACE", p, sz); }
 494 #endif
 495
 496 /* --- @a_notify@ --- *
 497  *
 498  * Arguments:   @const char *fmt@ = pointer to format string
 499  *              @...@ = other arguments
 500  *
 501  * Returns:     ---
 502  *
 503  * Use:         Sends a notification to interested admin connections.
 504  */
 505
 506 void a_notify(const char *fmt, ...)
 507 {
 508   va_list ap;
 509
 510   va_start(ap, fmt);
 511   a_valert(AF_NOTE, AF_NOTE, "NOTE", fmt, ap);
 512   va_end(ap);
 513 }
 514
 515 /* --- @a_quit@ --- *
 516  *
 517  * Arguments:   ---
 518  *
 519  * Returns:     ---
 520  *
 521  * Use:         Shuts things down nicely.
 522  */
 523
 524 void a_quit(void)
 525 {
 526   peer *p;
 527
 528   close(sock.fd);
 529   unlink(sockname);
 530   while ((p = p_first()) != 0)
 531     p_destroy(p);
 532   exit(0);
 533 }
 534
 535 /* --- @a_sigdie@ --- *
 536  *
 537  * Arguments:   @int sig@ = signal number
 538  *              @void *v@ = an uninteresting argument
 539  *
 540  * Returns:     ---
 541  *
 542  * Use          Shuts down on receipt of a fatal signal.
 543  */
 544
 545 static void a_sigdie(int sig, void *v)
 546 {
 547   char *p;
 548   char buf[20];
 549
 550   switch (sig) {
 551     case SIGTERM:       p = "SIGTERM"; break;
 552     case SIGINT:        p = "SIGINT"; break;
 553     default:
 554       sprintf(buf, "%i", sig);
 555       p = buf;
 556       break;
 557   }
 558   a_warn("SERVER", "quit", "signal", "%s", p, A_END);
 559   a_quit();
 560 }
 561
 562 /* --- @a_sighup@ --- *
 563  *
 564  * Arguments:   @int sig@ = signal number
 565  *              @void *v@ = an uninteresting argument
 566  *
 567  * Returns:     ---
 568  *
 569  * Use          Logs a message about SIGHUP not being useful.
 570  */
 571
 572 static void a_sighup(int sig, void *v)
 573 {
 574   a_warn("SERVER", "ignore", "signal", "SIGHUP", A_END);
 575 }
 576
 577 /* --- @a_parsetime@ --- *
 578  *
 579  * Arguments;   @const char *p@ = time string to parse
 580  *
 581  * Returns:     Time in seconds, or @< 0@ on error.
 582  */
 583
 584 static long a_parsetime(const char *p)
 585 {
 586   char *q;
 587   long t = strtol(p, &q, 0);
 588
 589   switch (*q) {
 590     case 'd': t *= 24;
 591     case 'h': t *= 60;
 592     case 'm': t *= 60;
 593     case 's': if (q[1] != 0)
 594     default:    t = -1;
 595     case 0:   break;
 596   }
 597   return (t);
 598 }
 599
 600 /* --- @a_findpeer@ --- *
 601  *
 602  * Arguments:   @admin *a@ = admin connection
 603  *              @const char *pn@ = peer name
 604  *
 605  * Returns:     The peer, or null if not there.
 606  *
 607  * Use:         Finds a peer, reporting an error if it failed.
 608  */
 609
 610 static peer *a_findpeer(admin *a, const char *pn)
 611 {
 612   peer *p;
 613
 614   if ((p = p_find(pn)) == 0)
 615     a_fail(a, "unknown-peer", "%s", pn, A_END);
 616   return (p);
 617 }
 618
 619 /*----- Backgrounded operations -------------------------------------------*/
 620
 621 #define BGTAG(bg)                                                       \
 622   (((admin_bgop *)(bg))->tag ? ((admin_bgop *)(bg))->tag : "<foreground>")
 623
 624 /* --- @a_bgrelease@ --- *
 625  *
 626  * Arguments:   @admin_bgop *bg@ = backgrounded operation
 627  *
 628  * Returns:     ---
 629  *
 630  * Use:         Removes a backgrounded operation from the queue, since
 631  *              (presumably) it's done.
 632  */
 633
 634 static void a_bgrelease(admin_bgop *bg)
 635 {
 636   admin *a = bg->a;
 637
 638   T( trace(T_ADMIN, "admin: release bgop %s", BGTAG(bg)); )
 639   if (bg->tag) xfree(bg->tag);
 640   else selbuf_enable(&a->b);
 641   if (bg->next) bg->next->prev = bg->prev;
 642   if (bg->prev) bg->prev->next = bg->next;
 643   else a->bg = bg->next;
 644   xfree(bg);
 645   if (a->f & AF_CLOSE) a_destroy(a);
 646   a_unlock(a);
 647 }
 648
 649 /* --- @a_bgok@, @a_bginfo@, @a_bgfail@ --- *
 650  *
 651  * Arguments:   @admin_bgop *bg@ = backgrounded operation
 652  *              @const char *fmt@ = format string
 653  *              @...@ = other arguments
 654  *
 655  * Returns:     ---
 656  *
 657  * Use:         Convenience functions for @a_write@.
 658  */
 659
 660 static void a_bgok(admin_bgop *bg)
 661   { a_write(bg->a, "OK", bg->tag, A_END); }
 662
 663 static void a_bginfo(admin_bgop *bg, const char *fmt, ...)
 664 {
 665   va_list ap;
 666   va_start(ap, fmt);
 667   a_vwrite(bg->a, "INFO", bg->tag, fmt, ap);
 668   va_end(ap);
 669 }
 670
 671 static void a_bgfail(admin_bgop *bg, const char *fmt, ...)
 672 {
 673   va_list ap;
 674   va_start(ap, fmt);
 675   a_vwrite(bg->a, "FAIL", bg->tag, fmt, ap);
 676   va_end(ap);
 677 }
 678
 679 /* --- @a_bgadd@ --- *
 680  *
 681  * Arguments:   @admin *a@ = administration connection
 682  *              @admin_bgop *bg@ = pointer to background operation
 683  *              @const char *tag@ = background tag, or null for foreground
 684  *              @void (*cancel)(admin_bgop *)@ = cancel function
 685  *
 686  * Returns:     ---
 687  *
 688  * Use:         Links a background job into the list.
 689  */
 690
 691 static void a_bgadd(admin *a, admin_bgop *bg, const char *tag,
 692                     void (*cancel)(admin_bgop *))
 693 {
 694   if (tag)
 695     bg->tag = xstrdup(tag);
 696   else {
 697     bg->tag = 0;
 698     selbuf_disable(&a->b);
 699   }
 700   bg->a = a;
 701   bg->cancel = cancel;
 702   bg->next = a->bg;
 703   bg->prev = 0;
 704   if (a->bg) a->bg->prev = bg;
 705   a->bg = bg;
 706   a_lock(a);
 707   T( trace(T_ADMIN, "admin: add bgop %s", BGTAG(bg)); )
 708   if (tag) a_write(a, "DETACH", tag, A_END);
 709 }
 710
 711 /*----- Name resolution operations ----------------------------------------*/
 712
 713 /* --- @a_resolved@ --- *
 714  *
 715  * Arguments:   @struct hostent *h@ = pointer to resolved hostname
 716  *              @void *v@ = pointer to resolver operation
 717  *
 718  * Returns:     ---
 719  *
 720  * Use:         Handles a completed name resolution.
 721  */
 722
 723 static void a_resolved(struct hostent *h, void *v)
 724 {
 725   admin_resop *r = v;
 726
 727   T( trace(T_ADMIN, "admin: resop %s resolved", BGTAG(r)); )
 728   TIMER;
 729   if (!h) {
 730     a_bgfail(&r->bg, "resolve-error", "%s", r->addr, A_END);
 731     r->func(r, ARES_FAIL);
 732   } else {
 733     memcpy(&r->sa.sin.sin_addr, h->h_addr, sizeof(struct in_addr));
 734     r->func(r, ARES_OK);
 735   }
 736   sel_rmtimer(&r->t);
 737   xfree(r->addr);
 738   a_bgrelease(&r->bg);
 739 }
 740
 741 /* --- @a_restimer@ --- *
 742  *
 743  * Arguments:   @struct timeval *tv@ = timer
 744  *              @void *v@ = pointer to resolver operation
 745  *
 746  * Returns:     ---
 747  *
 748  * Use:         Times out a resolver.
 749  */
 750
 751 static void a_restimer(struct timeval *tv, void *v)
 752 {
 753   admin_resop *r = v;
 754
 755   T( trace(T_ADMIN, "admin: resop %s timeout", BGTAG(r)); )
 756   a_bgfail(&r->bg, "resolver-timeout", "%s", r->addr, A_END);
 757   r->func(r, ARES_FAIL);
 758   bres_abort(&r->r);
 759   xfree(r->addr);
 760   a_bgrelease(&r->bg);
 761 }
 762
 763 /* --- @a_rescancel@ --- *
 764  *
 765  * Arguments:   @admin_bgop *bg@ = background operation
 766  *
 767  * Returns:     ---
 768  *
 769  * Use:         Cancels an add operation.
 770  */
 771
 772 static void a_rescancel(admin_bgop *bg)
 773 {
 774   admin_resop *r = (admin_resop *)bg;
 775
 776   T( trace(T_ADMIN, "admin: cancel resop %s", BGTAG(r)); )
 777   r->func(r, ARES_FAIL);
 778   sel_rmtimer(&r->t);
 779   xfree(r->addr);
 780   bres_abort(&r->r);
 781 }
 782
 783 /* --- @a_resolve@ --- *
 784  *
 785  * Arguments:   @admin *a@ = administration connection
 786  *              @admin_resop *r@ = resolver operation to run
 787  *              @const char *tag@ = background operation tag
 788  *              @void (*func)(struct admin_resop *, int@ = handler function
 789  *              @unsigned ac@ = number of remaining arguments
 790  *              @char *av[]@ = pointer to remaining arguments
 791  *
 792  * Returns:     ---
 793  *
 794  * Use:         Cranks up a resolver job.
 795  */
 796
 797 static void a_resolve(admin *a, admin_resop *r, const char *tag,
 798                       void (*func)(struct admin_resop *, int),
 799                       unsigned ac, char *av[])
 800 {
 801   struct timeval tv;
 802   unsigned long pt;
 803   char *p;
 804   int i = 0;
 805
 806   /* --- Fill in the easy bits of address --- */
 807
 808   r->addr = 0;
 809   r->func = func;
 810   if (mystrieq(av[i], "inet")) i++;
 811   if (ac - i != 2) {
 812     a_fail(a, "bad-addr-syntax", "[inet] ADDRESS PORT", A_END);
 813     goto fail;
 814   }
 815   r->sa.sin.sin_family = AF_INET;
 816   r->sasz = sizeof(r->sa.sin);
 817   r->addr = xstrdup(av[i]);
 818   pt = strtoul(av[i + 1], &p, 0);
 819   if (*p) {
 820     struct servent *s = getservbyname(av[i + 1], "udp");
 821     if (!s) {
 822       a_fail(a, "unknown-service", "%s", av[i + 1], A_END);
 823       goto fail;
 824     }
 825     pt = ntohs(s->s_port);
 826   }
 827   if (pt == 0 || pt >= 65536) {
 828     a_fail(a, "invalid-port", "%lu", pt, A_END);
 829     goto fail;
 830   }
 831   r->sa.sin.sin_port = htons(pt);
 832
 833   /* --- Report backgrounding --- *
 834    *
 835    * Do this for consistency of interface, even if we're going to get the
 836    * answer straight away.
 837    */
 838
 839   a_bgadd(a, &r->bg, tag, a_rescancel);
 840   T( trace(T_ADMIN, "admin: %u, resop %s, hostname `%s'",
 841            a->seq, BGTAG(r), r->addr); )
 842
 843   /* --- If the name is numeric, do it the easy way --- */
 844
 845   if (inet_aton(av[i], &r->sa.sin.sin_addr)) {
 846     T( trace(T_ADMIN, "admin: resop %s done the easy way", BGTAG(r)); )
 847     func(r, ARES_OK);
 848     xfree(r->addr);
 849     a_bgrelease(&r->bg);
 850     return;
 851   }
 852
 853   /* --- Store everything for later and crank up the resolver --- */
 854
 855   gettimeofday(&tv, 0);
 856   tv.tv_sec += T_RESOLVE;
 857   sel_addtimer(&sel, &r->t, &tv, a_restimer, r);
 858   bres_byname(&r->r, r->addr, a_resolved, r);
 859   return;
 860
 861 fail:
 862   func(r, ARES_FAIL);
 863   if (r->addr) xfree(r->addr);
 864   xfree(r);
 865 }
 866
 867 /*----- Adding peers ------------------------------------------------------*/
 868
 869 /* --- @a_doadd@ --- *
 870  *
 871  * Arguments:   @admin_resop *r@ = resolver operation
 872  *              @int rc@ = how it worked
 873  *
 874  * Returns:     ---
 875  *
 876  * Use:         Handles a completed resolution.
 877  */
 878
 879 static void a_doadd(admin_resop *r, int rc)
 880 {
 881   admin_addop *add = (admin_addop *)r;
 882
 883   T( trace(T_ADMIN, "admin: done add op %s", BGTAG(add)); )
 884
 885   if (rc == ARES_OK) {
 886     add->peer.sasz = add->r.sasz;
 887     add->peer.sa = add->r.sa;
 888     if (p_find(add->peer.name))
 889       a_bgfail(&add->r.bg, "peer-exists", "%s", add->peer.name, A_END);
 890     else if (!p_create(&add->peer))
 891       a_bgfail(&add->r.bg, "peer-create-fail", "%s", add->peer.name, A_END);
 892     else
 893       a_bgok(&add->r.bg);
 894   }
 895
 896   xfree(add->peer.name);
 897 }
 898
 899 /* --- @acmd_add@ --- *
 900  *
 901  * Arguments:   @admin *a@ = connection which requested the addition
 902  *              @unsigned ac@ = argument count
 903  *              @char *av[]@ = pointer to the argument list
 904  *
 905  * Returns:     ---
 906  *
 907  * Use:         Adds a new peer.
 908  */
 909
 910 static void acmd_add(admin *a, unsigned ac, char *av[])
 911 {
 912   unsigned i, j;
 913   const char *tag = 0;
 914   admin_addop *add = 0;
 915
 916   /* --- Set stuff up --- */
 917
 918   add = xmalloc(sizeof(*add));
 919   add->peer.name = xstrdup(av[0]);
 920   add->peer.t_ka = 0;
 921   add->peer.tops = tun_default;
 922
 923   /* --- Make sure someone's not got there already --- */
 924
 925   if (p_find(av[0])) {
 926     a_fail(a, "peer-exists", "%s", av[0], A_END);
 927     goto fail;
 928   }
 929
 930   /* --- Parse options --- */
 931
 932   i = 1;
 933   for (;;) {
 934     if (!av[i])
 935       goto bad_syntax;
 936     if (mystrieq(av[i], "-background")) {
 937       if (!av[++i]) goto bad_syntax;
 938       tag = av[i];
 939     } else if (mystrieq(av[i], "-tunnel")) {
 940       if (!av[++i]) goto bad_syntax;
 941       for (j = 0;; j++) {
 942         if (!tunnels[j]) {
 943           a_fail(a, "unknown-tunnel", "%s", av[i], A_END);
 944           goto fail;
 945         }
 946         if (mystrieq(av[i], tunnels[j]->name)) {
 947           add->peer.tops = tunnels[j];
 948           break;
 949         }
 950       }
 951     } else if (mystrieq(av[i], "-keepalive")) {
 952       long t;
 953       if (!av[++i]) goto bad_syntax;
 954       if ((t = a_parsetime(av[i])) < 0) {
 955         a_fail(a, "bad-time-spec", "%s", av[i], A_END);
 956         goto fail;
 957       }
 958       add->peer.t_ka = t;
 959     } else if (mystrieq(av[i], "--")) {
 960       i++;
 961       break;
 962     } else
 963       break;
 964     i++;
 965   }
 966
 967   /* --- Crank up the resolver --- */
 968
 969   a_resolve(a, &add->r, tag, a_doadd, ac - i, av + i);
 970   return;
 971
 972   /* --- Clearing up --- */
 973
 974 bad_syntax:
 975   a_fail(a, "bad-syntax", "add", "PEER [OPTIONS] ADDR ...", A_END);
 976 fail:
 977   xfree(add->peer.name);
 978   xfree(add);
 979   return;
 980 }
 981
 982 /*----- Ping --------------------------------------------------------------*/
 983
 984 /* --- @a_pingcancel@ --- *
 985  *
 986  * Arguments:   @admin_bgop *bg@ = background operation block
 987  *
 988  * Returns:     ---
 989  *
 990  * Use:         Cancels a running ping.
 991  */
 992
 993 static void a_pingcancel(admin_bgop *bg)
 994 {
 995   admin_pingop *pg = (admin_pingop *)bg;
 996   T( trace(T_ADMIN, "admin: cancel ping op %s", BGTAG(pg)); )
 997   p_pingdone(&pg->ping, PING_NONOTIFY);
 998 }
 999
1000 /* --- @a_pong@ --- *
1001  *
1002  * Arguments:   @int rc@ = return code
1003  *              @void *v@ = ping operation block
1004  *
1005  * Returns:     ---
1006  *
1007  * Use:         Collects what happened to a ping message.
1008  */
1009
1010 static void a_pong(int rc, void *v)
1011 {
1012   admin_pingop *pg = v;
1013   struct timeval tv;
1014   double millis;
1015
1016   switch (rc) {
1017     case PING_OK:
1018       gettimeofday(&tv, 0);
1019       tv_sub(&tv, &tv, &pg->pingtime);
1020       millis = (double)tv.tv_sec * 1000 + (double)tv.tv_usec/1000;
1021       a_bginfo(&pg->bg, "ping-ok", "%.1f", millis, A_END);
1022       a_bgok(&pg->bg);
1023       break;
1024     case PING_TIMEOUT:
1025       a_bginfo(&pg->bg, "ping-timeout", A_END);
1026       a_bgok(&pg->bg);
1027       break;
1028     case PING_PEERDIED:
1029       a_bginfo(&pg->bg, "ping-peer-died", A_END);
1030       a_bgok(&pg->bg);
1031       break;
1032     default:
1033       abort();
1034   }
1035   T( trace(T_ADMIN, "admin: ponged ping op %s", BGTAG(pg)); )
1036   a_bgrelease(&pg->bg);
1037 }
1038
1039 /* --- @acmd_ping@, @acmd_eping@ --- *
1040  *
1041  * Arguments:   @admin *a@ = connection which requested the ping
1042  *              @unsigned ac@ = argument count
1043  *              @char *av[]@ = pointer to the argument list
1044  *
1045  * Returns:     ---
1046  *
1047  * Use:         Pings a peer.
1048  */
1049
1050 static void a_ping(admin *a, unsigned ac, char *av[],
1051                    const char *cmd, unsigned msg)
1052 {
1053   long t = T_PING;
1054   int i;
1055   peer *p;
1056   admin_pingop *pg = 0;
1057   const char *tag = 0;
1058
1059   i = 0;
1060   for (;;) {
1061     if (!av[i])
1062       goto bad_syntax;
1063     if (mystrieq(av[i], "-background")) {
1064       if (!av[++i]) goto bad_syntax;
1065       tag = av[i];
1066     } else if (mystrieq(av[i], "-timeout")) {
1067       if (!av[++i]) goto bad_syntax;
1068       if ((t = a_parsetime(av[i])) < 0) {
1069         a_fail(a, "bad-time-spec", "%s", av[i], A_END);
1070         return;
1071       }
1072     } else if (mystrieq(av[i], "--")) {
1073       i++;
1074       break;
1075     } else
1076       break;
1077     i++;
1078   }
1079
1080   if (!av[i]) goto bad_syntax;
1081   if ((p = a_findpeer(a, av[i])) == 0)
1082     return;
1083   pg = xmalloc(sizeof(*pg));
1084   gettimeofday(&pg->pingtime, 0);
1085   a_bgadd(a, &pg->bg, tag, a_pingcancel);
1086   T( trace(T_ADMIN, "admin: ping op %s: %s to %s",
1087            BGTAG(pg), cmd, p_name(p)); )
1088   if (p_pingsend(p, &pg->ping, msg, t, a_pong, pg)) {
1089     a_bgfail(&pg->bg, "ping-send-failed", A_END);
1090     a_bgrelease(&pg->bg);
1091   }
1092   return;
1093
1094 bad_syntax:
1095   a_fail(a, "bad-syntax", "%s", cmd, "[OPTIONS] PEER", cmd, A_END);
1096   return;
1097 }
1098
1099 static void acmd_ping(admin *a, unsigned ac, char *av[])
1100   { a_ping(a, ac, av, "ping", MISC_PING); }
1101 static void acmd_eping(admin *a, unsigned ac, char *av[])
1102   { a_ping(a, ac, av, "eping", MISC_EPING); }
1103
1104 /*----- Administration commands -------------------------------------------*/
1105
1106 /* --- Miscellaneous commands --- */
1107
1108 /* --- @traceish@ --- *
1109  *
1110  * Arguments:   @admin *a@ = connection to complain on
1111  *              @unsigned ac@ = number of arguments
1112  *              @char *av[]@ = vector of arguments
1113  *              @const char *what@ = what we're messing with
1114  *              @const trace_opt *tt@ = options table
1115  *              @unsigned *ff@ = where the flags are
1116  *
1117  * Returns:     Nonzero if anything changed.
1118  *
1119  * Use:         Guts of trace-ish commands like `trace' and `watch'.
1120  */
1121
1122 static int traceish(admin *a, unsigned ac, char *av[],
1123                     const char *what, const trace_opt *tt, unsigned *ff)
1124 {
1125   int ch = 0;
1126
1127   if (!ac || strcmp(av[0], "?") == 0) {
1128     const trace_opt *t;
1129     for (t = tt; t->ch; t++) {
1130       a_info(a, "*%c%c %s",
1131              t->ch, (*ff & t->f) == t->f ? '+' : ' ', t->help, A_END);
1132     }
1133   } else {
1134     unsigned sense = 1;
1135     unsigned f = *ff;
1136     const trace_opt *t;
1137     char *p = av[0];
1138
1139     while (*p) {
1140       switch (*p) {
1141         case '+': sense = 1; break;
1142         case '-': sense = 0; break;
1143         default:
1144           for (t = tt; t->ch; t++) {
1145             if (t->ch == *p) {
1146               if (sense) f |= t->f;
1147               else f &= ~t->f;
1148               goto tropt_ok;
1149             }
1150           }
1151           a_fail(a, "bad-%s-option", what, "%c", *p, A_END);
1152           return (0);
1153         tropt_ok:;
1154           break;
1155       }
1156       p++;
1157     }
1158     *ff = f;
1159     ch = 1;
1160   }
1161   a_ok(a);
1162   return (ch);
1163 }
1164
1165 #ifndef NTRACE
1166
1167 static void acmd_trace(admin *a, unsigned ac, char *av[])
1168 {
1169   if (traceish(a, ac, av, "trace", tr_opts, &tr_flags))
1170     trace_level(tr_flags);
1171 }
1172
1173 #endif
1174
1175 static void acmd_watch(admin *a, unsigned ac, char *av[])
1176 {
1177   traceish(a, ac, av, "watch", w_opts, &a->f);
1178 }
1179
1180 static void alertcmd(admin *a, unsigned f_and, unsigned f_eq,
1181                      const char *tag, unsigned ac, char *av[])
1182 {
1183   dstr d = DSTR_INIT;
1184   unsigned i;
1185
1186   dstr_puts(&d, "USER");
1187   for (i = 0; i < ac; i++)
1188     quotify(&d, av[i]);
1189   dstr_putz(&d);
1190   a_rawalert(f_and, f_eq, tag, d.buf, d.len);
1191   dstr_destroy(&d);
1192   a_ok(a);
1193 }
1194
1195 static void acmd_notify(admin *a, unsigned ac, char *av[])
1196   { alertcmd(a, AF_NOTE, AF_NOTE, "NOTE", ac, av); }
1197 static void acmd_warn(admin *a, unsigned ac, char *av[])
1198   { alertcmd(a, AF_WARN, AF_WARN, "WARN", ac, av); }
1199
1200 static void acmd_port(admin *a, unsigned ac, char *av[])
1201 {
1202   a_info(a, "%u", p_port(), A_END);
1203   a_ok(a);
1204 }
1205
1206 static void acmd_daemon(admin *a, unsigned ac, char *av[])
1207 {
1208   if (flags & F_DAEMON)
1209     a_fail(a, "already-daemon", A_END);
1210   else {
1211     a_notify("DAEMON", A_END);
1212     if (a_stdin)
1213       a_destroy(a_stdin);
1214     if (u_daemon())
1215       a_fail(a, "daemon-error", "?ERRNO", A_END);
1216     else {
1217       flags |= F_DAEMON;
1218       a_ok(a);
1219     }
1220   }
1221 }
1222
1223 static void acmd_list(admin *a, unsigned ac, char *av[])
1224 {
1225   peer *p;
1226   for (p = p_first(); p; p = p_next(p))
1227     a_info(a, "%s", p_name(p), A_END);
1228   a_ok(a);
1229 }
1230
1231 static void acmd_ifname(admin *a, unsigned ac, char *av[])
1232 {
1233   peer *p;
1234
1235   if ((p = a_findpeer(a, av[0])) != 0) {
1236     a_info(a, "%s", p_ifname(p), A_END);
1237     a_ok(a);
1238   }
1239 }
1240
1241 static void acmd_getchal(admin *a, unsigned ac, char *av[])
1242 {
1243   buf b;
1244
1245   buf_init(&b, buf_i, PKBUFSZ);
1246   c_new(&b);
1247   a_info(a, "?B64", BBASE(&b), (size_t)BLEN(&b), A_END);
1248   a_ok(a);
1249 }
1250
1251 static void acmd_checkchal(admin *a, unsigned ac, char *av[])
1252 {
1253   base64_ctx b64;
1254   buf b;
1255   dstr d = DSTR_INIT;
1256
1257   base64_init(&b64);
1258   base64_decode(&b64, av[0], strlen(av[0]), &d);
1259   base64_decode(&b64, 0, 0, &d);
1260   buf_init(&b, d.buf, d.len);
1261   if (c_check(&b) || BBAD(&b) || BLEFT(&b))
1262     a_fail(a, "invalid-challenge", A_END);
1263   else
1264     a_ok(a);
1265   dstr_destroy(&d);
1266 }
1267
1268 static void acmd_greet(admin *a, unsigned ac, char *av[])
1269 {
1270   peer *p;
1271   base64_ctx b64;
1272   dstr d = DSTR_INIT;
1273
1274   if ((p = a_findpeer(a, av[0])) != 0) {
1275     base64_init(&b64);
1276     base64_decode(&b64, av[1], strlen(av[1]), &d);
1277     base64_decode(&b64, 0, 0, &d);
1278     p_greet(p, d.buf, d.len);
1279     dstr_destroy(&d);
1280     a_ok(a);
1281   }
1282 }
1283
1284 static void acmd_addr(admin *a, unsigned ac, char *av[])
1285 {
1286   peer *p;
1287   const addr *ad;
1288
1289   if ((p = a_findpeer(a, av[0])) != 0) {
1290     ad = p_addr(p);
1291     assert(ad->sa.sa_family == AF_INET);
1292     a_info(a, "?ADDR", ad, A_END);
1293     a_ok(a);
1294   }
1295 }
1296
1297 static void acmd_peerinfo(admin *a, unsigned ac, char *av[])
1298 {
1299   peer *p;
1300   const peerspec *ps;
1301
1302   if ((p = a_findpeer(a, av[0])) != 0) {
1303     ps = p_spec(p);
1304     a_info(a, "tunnel=%s", ps->tops->name, A_END);
1305     a_info(a, "keepalive=%lu", ps->t_ka, A_END);
1306     a_ok(a);
1307   }
1308 }
1309
1310 static void acmd_servinfo(admin *a, unsigned ac, char *av[])
1311 {
1312   a_info(a, "implementation=edgeware-tripe", A_END);
1313   a_info(a, "version=%s", VERSION, A_END);
1314   a_info(a, "daemon=%s", BOOL(flags & F_DAEMON), A_END);
1315   a_ok(a);
1316 }
1317
1318 static void acmd_stats(admin *a, unsigned ac, char *av[])
1319 {
1320   peer *p;
1321   stats *st;
1322
1323   if ((p = a_findpeer(a, av[0])) == 0)
1324     return;
1325
1326   st = p_stats(p);
1327   a_info(a, "start-time=%s", timestr(st->t_start), A_END);
1328   a_info(a, "last-packet-time=%s", timestr(st->t_last), A_END);
1329   a_info(a, "last-keyexch-time=%s", timestr(st->t_kx), A_END);
1330   a_info(a, "packets-in=%lu bytes-in=%lu", st->n_in, st->sz_in, A_END);
1331   a_info(a, "packets-out=%lu bytes-out=%lu",
1332          st->n_out, st->sz_out, A_END);
1333   a_info(a, "keyexch-packets-in=%lu keyexch-bytes-in=%lu",
1334          st->n_kxin, st->sz_kxin, A_END);
1335   a_info(a, "keyexch-packets-out=%lu keyexch-bytes-out=%lu",
1336          st->n_kxout, st->sz_kxout, A_END);
1337   a_info(a, "ip-packets-in=%lu ip-bytes-in=%lu",
1338          st->n_ipin, st->sz_ipin, A_END);
1339   a_info(a, "ip-packets-out=%lu ip-bytes-out=%lu",
1340          st->n_ipout, st->sz_ipout, A_END);
1341   a_info(a, "rejected-packets=%lu", st->n_reject, A_END);
1342   a_ok(a);
1343 }
1344
1345 static void acmd_kill(admin *a, unsigned ac, char *av[])
1346 {
1347   peer *p;
1348   if ((p = a_findpeer(a, av[0])) != 0) {
1349     p_destroy(p);
1350     a_ok(a);
1351   }
1352 }
1353
1354 static void acmd_forcekx(admin *a, unsigned ac, char *av[])
1355 {
1356   peer *p;
1357   if ((p = a_findpeer(a, av[0])) != 0) {
1358     kx_start(&p->kx, 1);
1359     a_ok(a);
1360   }
1361 }
1362
1363 static void acmd_reload(admin *a, unsigned ac, char *av[])
1364   { p_keyreload(); a_ok(a); }
1365
1366 static void acmd_quit(admin *a, unsigned ac, char *av[])
1367 {
1368   a_warn("SERVER", "quit", "admin-request", A_END);
1369   a_ok(a);
1370   a_unlock(a);
1371   a_quit();
1372 }
1373
1374 static void acmd_version(admin *a, unsigned ac, char *av[])
1375 {
1376   a_info(a, "%s", PACKAGE, "%s", VERSION, A_END);
1377   a_ok(a);
1378 }
1379
1380 static void acmd_tunnels(admin *a, unsigned ac, char *av[])
1381 {
1382   int i;
1383   for (i = 0; tunnels[i]; i++)
1384     a_info(a, "%s", tunnels[i]->name, A_END);
1385   a_ok(a);
1386 }
1387
1388 /* --- The command table and help --- */
1389
1390 typedef struct acmd {
1391   const char *name;
1392   const char *help;
1393   unsigned argmin, argmax;
1394   void (*func)(admin */*a*/, unsigned /*ac*/, char */*av*/[]);
1395 } acmd;
1396
1397 static void acmd_help(admin */*a*/, unsigned /*ac*/, char */*av*/[]);
1398
1399 static const acmd acmdtab[] = {
1400   { "add",      "PEER [OPTIONS] ADDR ...", 2,   0xffff, acmd_add },
1401   { "addr",     "PEER",                 1,      1,      acmd_addr },
1402   { "checkchal", "CHAL",                1,      1,      acmd_checkchal },
1403   { "daemon",   0,                      0,      0,      acmd_daemon },
1404   { "eping",    "[OPTIONS] PEER",       1,      0xffff, acmd_eping },
1405   { "forcekx",  "PEER",                 1,      1,      acmd_forcekx },
1406   { "getchal",  0,                      0,      0,      acmd_getchal },
1407   { "greet",    "PEER CHAL",            2,      2,      acmd_greet },
1408   { "help",     0,                      0,      0,      acmd_help },
1409   { "ifname",   "PEER",                 1,      1,      acmd_ifname },
1410   { "kill",     "PEER",                 1,      1,      acmd_kill },
1411   { "list",     0,                      0,      0,      acmd_list },
1412   { "notify",   "MESSAGE ...",          1,      0xffff, acmd_notify },
1413   { "peerinfo", "PEER",                 1,      1,      acmd_peerinfo },
1414   { "ping",     "[OPTIONS] PEER",       1,      0xffff, acmd_ping },
1415   { "port",     0,                      0,      0,      acmd_port },
1416   { "quit",     0,                      0,      0,      acmd_quit },
1417   { "reload",   0,                      0,      0,      acmd_reload },
1418   { "servinfo", 0,                      0,      0,      acmd_servinfo },
1419   { "stats",    "PEER",                 1,      1,      acmd_stats },
1420 #ifndef NTRACE
1421   { "trace",    "[OPTIONS]",            0,      1,      acmd_trace },
1422 #endif
1423   { "tunnels",  0,                      0,      0,      acmd_tunnels },
1424   { "version",  0,                      0,      0,      acmd_version },
1425   { "warn",     "MESSAGE ...",          1,      0xffff, acmd_warn },
1426   { "watch",    "[OPTIONS]",            0,      1,      acmd_watch },
1427   { 0,          0,                      0,      0,      0 }
1428 };
1429
1430 static void acmd_help(admin *a, unsigned ac, char *av[])
1431 {
1432   const acmd *c;
1433   for (c = acmdtab; c->name; c++) {
1434     if (c->help)
1435       a_info(a, "%s", c->name, "*%s", c->help, A_END);
1436     else
1437       a_info(a, "%s", c->name, A_END);
1438   }
1439   a_ok(a);
1440 }
1441
1442 /*----- Connection handling -----------------------------------------------*/
1443
1444 /* --- @a_lock@ --- *
1445  *
1446  * Arguments:   @admin *a@ = pointer to an admin block
1447  *
1448  * Returns:     ---
1449  *
1450  * Use:         Locks an admin block so that it won't be destroyed
1451  *              immediately.
1452  */
1453
1454 static void a_lock(admin *a) { a->ref++; }
1455
1456 /* --- @a_dodestroy@ --- *
1457  *
1458  * Arguments:   @admin *a@ = pointer to an admin block
1459  *
1460  * Returns:     ---
1461  *
1462  * Use:         Actually does the legwork of destroying an admin block.
1463  */
1464
1465 static void a_dodestroy(admin *a)
1466 {
1467   admin_bgop *bg, *bbg;
1468
1469   T( trace(T_ADMIN, "admin: completing destruction of connection %u",
1470            a->seq); )
1471
1472   selbuf_destroy(&a->b);
1473   for (bg = a->bg; bg; bg = bbg) {
1474     bbg = bg->next;
1475     bg->cancel(bg);
1476     if (bg->tag) xfree(bg->tag);
1477     xfree(bg);
1478   }
1479   if (a->b.reader.fd != a->w.fd) close(a->b.reader.fd);
1480   close(a->w.fd);
1481
1482   if (a_stdin == a)
1483     a_stdin = 0;
1484   if (a->next)
1485     a->next->prev = a->prev;
1486   if (a->prev)
1487     a->prev->next = a->next;
1488   else
1489     admins = a->next;
1490   DESTROY(a);
1491 }
1492
1493 /* --- @a_unlock@ --- *
1494  *
1495  * Arguments:   @admin *a@ = pointer to an admin block
1496  *
1497  * Returns:     ---
1498  *
1499  * Use:         Unlocks an admin block, allowing its destruction.  This is
1500  *              also the second half of @a_destroy@.
1501  */
1502
1503 static void a_unlock(admin *a)
1504 {
1505   assert(a->ref);
1506   if (!--a->ref && (a->f & AF_DEAD))
1507     a_dodestroy(a);
1508 }
1509
1510 /* --- @a_destroy@ --- *
1511  *
1512  * Arguments:   @admin *a@ = pointer to an admin block
1513  *
1514  * Returns:     ---
1515  *
1516  * Use:         Destroys an admin block.  This requires a certain amount of
1517  *              care.
1518  */
1519
1520 static void freequeue(oqueue *q)
1521 {
1522   obuf *o, *oo;
1523
1524   for (o = q->hd; o; o = oo) {
1525     oo = o->next;
1526     xfree(o);
1527   }
1528   q->hd = q->tl = 0;
1529 }
1530
1531 static void a_destroy(admin *a)
1532 {
1533   /* --- Don't multiply destroy admin blocks --- */
1534
1535   if (a->f & AF_DEAD)
1536     return;
1537
1538   /* --- Make sure nobody expects it to work --- */
1539
1540   a->f |= AF_DEAD;
1541   T( trace(T_ADMIN, "admin: destroying connection %u", a->seq); )
1542
1543   /* --- Free the output buffers --- */
1544
1545   if (a->out.hd)
1546     sel_rmfile(&a->w);
1547   freequeue(&a->out);
1548
1549   /* --- If the block is locked, that's all we can manage --- */
1550
1551   if (!a->ref)
1552     a_dodestroy(a);
1553   T( else
1554      trace(T_ADMIN, "admin: deferring destruction..."); )
1555 }
1556
1557 /* --- @a_line@ --- *
1558  *
1559  * Arguments:   @char *p@ = pointer to the line read
1560  *              @size_t len@ = length of the line
1561  *              @void *vp@ = pointer to my admin block
1562  *
1563  * Returns:     ---
1564  *
1565  * Use:         Handles a line of input.
1566  */
1567
1568 static void a_line(char *p, size_t len, void *vp)
1569 {
1570   admin *a = vp;
1571   const acmd *c;
1572   char *av[16];
1573   size_t ac;
1574
1575   TIMER;
1576   if (a->f & AF_DEAD)
1577     return;
1578   if (!p) {
1579     if (!a->bg)
1580       a_destroy(a);
1581     else {
1582       a->f |= AF_CLOSE;
1583       selbuf_disable(&a->b);
1584     }
1585     return;
1586   }
1587   ac = str_qsplit(p, av, 16, 0, STRF_QUOTE);
1588   if (!ac)
1589     return;
1590   for (c = acmdtab; c->name; c++) {
1591     if (mystrieq(av[0], c->name)) {
1592       ac--;
1593       if (c->argmin > ac || ac > c->argmax) {
1594         if (!c->help)
1595           a_fail(a, "bad-syntax", "%s", c->name, "", A_END);
1596         else
1597           a_fail(a, "bad-syntax", "%s", c->name, "%s", c->help, A_END);
1598       } else {
1599         a_lock(a);
1600         c->func(a, ac, av + 1);
1601         a_unlock(a);
1602       }
1603       return;
1604     }
1605   }
1606   a_fail(a, "unknown-command", "%s", av[0], A_END);
1607 }
1608
1609 /* --- @a_create@ --- *
1610  *
1611  * Arguments:   @int fd_in, fd_out@ = file descriptors to use
1612  *              @unsigned f@ = initial flags to set
1613  *
1614  * Returns:     ---
1615  *
1616  * Use:         Creates a new admin connection.
1617  */
1618
1619 void a_create(int fd_in, int fd_out, unsigned f)
1620 {
1621   admin *a = CREATE(admin);
1622
1623   T( static unsigned seq = 0;
1624      a->seq = seq++; )
1625   T( trace(T_ADMIN, "admin: accepted connection %u", a->seq); )
1626   a->bg = 0;
1627   a->f = f;
1628   if (fd_in == STDIN_FILENO) a_stdin = a;
1629   fdflags(fd_in, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
1630   if (fd_out != fd_in)
1631     fdflags(fd_out, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
1632   selbuf_init(&a->b, &sel, fd_in, a_line, a);
1633   sel_initfile(&sel, &a->w, fd_out, SEL_WRITE, a_flush, a);
1634   a->out.hd = a->out.tl = 0;
1635   a->next = admins;
1636   a->prev = 0;
1637   if (admins) admins->prev = a;
1638   admins = a;
1639 }
1640
1641 /* --- @a_accept@ --- *
1642  *
1643  * Arguments:   @int fd@ = file descriptor to accept
1644  *              @unsigned mode@ = what to do
1645  *              @void *v@ = uninteresting pointer
1646  *
1647  * Returns:     ---
1648  *
1649  * Use:         Accepts a new admin connection.
1650  */
1651
1652 static void a_accept(int fd, unsigned mode, void *v)
1653 {
1654   int nfd;
1655   struct sockaddr_un sun;
1656   size_t sz = sizeof(sun);
1657
1658   if ((nfd = accept(fd, (struct sockaddr *)&sun, &sz)) < 0) {
1659     if (errno != EINTR && errno != EAGAIN && errno != EWOULDBLOCK &&
1660         errno != ECONNABORTED && errno != EPROTO)
1661       a_warn("ADMIN", "accept-error", "?ERRNO", A_END);
1662     return;
1663   }
1664   a_create(nfd, nfd, 0);
1665 }
1666
1667 /* --- @a_daemon@ --- *
1668  *
1669  * Arguments:   ---
1670  *
1671  * Returns:     ---
1672  *
1673  * Use:         Informs the admin module that it's a daemon.
1674  */
1675
1676 void a_daemon(void)
1677 {
1678   flags |= F_DAEMON;
1679 }
1680
1681 /* --- @a_init@ --- *
1682  *
1683  * Arguments:   @const char *name@ = socket name to create
1684  *
1685  * Returns:     ---
1686  *
1687  * Use:         Creates the admin listening socket.
1688  */
1689
1690 void a_init(const char *name)
1691 {
1692   int fd;
1693   int n = 5;
1694   struct sockaddr_un sun;
1695   struct sigaction sa;
1696   size_t sz;
1697
1698   /* --- Set up the socket address --- */
1699
1700   sz = strlen(name) + 1;
1701   if (sz > sizeof(sun.sun_path))
1702     die(EXIT_FAILURE, "socket name `%s' too long", name);
1703   BURN(sun);
1704   sun.sun_family = AF_UNIX;
1705   memcpy(sun.sun_path, name, sz);
1706   sz += offsetof(struct sockaddr_un, sun_path);
1707
1708   /* --- Attempt to bind to the socket --- */
1709
1710   umask(0077);
1711 again:
1712   if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1713     die(EXIT_FAILURE, "couldn't create socket: %s", strerror(errno));
1714   if (bind(fd, (struct sockaddr *)&sun, sz) < 0) {
1715     struct stat st;
1716     int e = errno;
1717     if (errno != EADDRINUSE) {
1718       die(EXIT_FAILURE, "couldn't bind to address `%s': %s",
1719           sun.sun_path, strerror(e));
1720     }
1721     if (!n)
1722       die(EXIT_FAILURE, "too many retries; giving up");
1723     n--;
1724     if (!connect(fd, (struct sockaddr *)&sun, sz)) {
1725       die(EXIT_FAILURE, "server already listening on admin socket `%s'",
1726           sun.sun_path);
1727     }
1728     if (errno != ECONNREFUSED)
1729       die(EXIT_FAILURE, "couldn't bind to address: %s", strerror(e));
1730     if (stat(sun.sun_path, &st)) {
1731       die(EXIT_FAILURE, "couldn't stat `%s': %s",
1732           sun.sun_path, strerror(errno));
1733     }
1734     if (!S_ISSOCK(st.st_mode))
1735       die(EXIT_FAILURE, "object `%s' isn't a socket", sun.sun_path);
1736     T( trace(T_ADMIN, "admin: stale socket found; removing it"); )
1737     unlink(sun.sun_path);
1738     close(fd);
1739     goto again;
1740   }
1741   chmod(sun.sun_path, 0600);
1742   fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
1743   if (listen(fd, 5))
1744     die(EXIT_FAILURE, "couldn't listen on socket: %s", strerror(errno));
1745
1746   /* --- Listen to the socket --- */
1747
1748   sel_initfile(&sel, &sock, fd, SEL_READ, a_accept, 0);
1749   sel_addfile(&sock);
1750   sockname = name;
1751   bres_init(&sel);
1752   T( trace_custom(a_trace, 0);
1753      trace(T_ADMIN, "admin: enabled custom tracing"); )
1754   flags |= F_INIT;
1755
1756   /* --- Set up signal handlers --- */
1757
1758   sig_add(&s_term, SIGTERM, a_sigdie, 0);
1759   sig_add(&s_hup, SIGHUP, a_sighup, 0);
1760   signal(SIGPIPE, SIG_IGN);
1761   sigaction(SIGINT, 0, &sa);
1762   if (sa.sa_handler != SIG_IGN)
1763     sig_add(&s_int, SIGINT, a_sigdie, 0);
1764 }
1765
1766 /*----- That's all, folks -------------------------------------------------*/