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

   1 /* -*-c-*-
   2  *
   3  * An evil proxy for TrIPE
   4  *
   5  * (c) 2001 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Trivial IP Encryption (TrIPE).
  11  *
  12  * TrIPE is free software: you can redistribute it and/or modify it under
  13  * the terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 3 of the License, or (at your
  15  * option) any later version.
  16  *
  17  * TrIPE is distributed in the hope that it will be useful, but WITHOUT
  18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  * for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with TrIPE.  If not, see <https://www.gnu.org/licenses/>.
  24  */
  25
  26 /*----- Header files ------------------------------------------------------*/
  27
  28 #include "config.h"
  29
  30 #include <assert.h>
  31 #include <errno.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <time.h>
  36
  37 #include <sys/types.h>
  38 #include <sys/time.h>
  39 #include <unistd.h>
  40 #include <fcntl.h>
  41
  42 #include <sys/socket.h>
  43 #include <netinet/in.h>
  44 #include <arpa/inet.h>
  45 #include <netdb.h>
  46
  47 #include <mLib/alloc.h>
  48 #include <mLib/dstr.h>
  49 #include <mLib/fdflags.h>
  50 #include <mLib/mdwopt.h>
  51 #include <mLib/quis.h>
  52 #include <mLib/report.h>
  53 #include <mLib/sel.h>
  54 #include <mLib/sub.h>
  55 #include <mLib/tv.h>
  56
  57 #include <catacomb/buf.h>
  58
  59 #include <catacomb/key.h>
  60
  61 #include <catacomb/mp.h>
  62 #include <catacomb/mprand.h>
  63 #include <catacomb/dh.h>
  64
  65 #include <catacomb/chacha20.h>
  66 #include <catacomb/noise.h>
  67 #include <catacomb/rand.h>
  68
  69 #include "util.h"
  70
  71 /*----- Data structures ---------------------------------------------------*/
  72
  73 typedef struct peer {
  74   sel_file sf;
  75   const char *name;
  76   struct filter *f;
  77 } peer;
  78
  79 typedef struct filter {
  80   struct filter *next;
  81   peer *p_from, *p_to;
  82   void (*func)(struct filter */*f*/, const octet */*buf*/, size_t /*sz*/);
  83   void *state;
  84 } filter;
  85
  86 typedef struct qnode {
  87   octet *buf;
  88   size_t sz;
  89 } qnode;
  90
  91 /*----- Static variables --------------------------------------------------*/
  92
  93 #define PKBUFSZ 65536
  94
  95 static sel_state sel;
  96 static peer peers[2];
  97 static unsigned npeer = 0;
  98 static key_file keys;
  99 static grand *rng;
 100 static const char *delim = ":";
 101
 102 #define PASS(f, buf, sz) ((f) ? (f)->func((f), (buf), (sz)) : (void)0)
 103 #define RND(i) (rng->ops->range(rng, (i)))
 104
 105 /*----- Peer management ---------------------------------------------------*/
 106
 107 static void dopacket(int fd, unsigned mode, void *vv)
 108 {
 109   octet buf[PKBUFSZ];
 110   peer *p = vv;
 111   int r = read(fd, buf, sizeof(buf));
 112   if (r >= 0) {
 113     printf("recv from `%s'\n", p->name);
 114     PASS(p->f, buf, r);
 115   }
 116 }
 117
 118 static void addpeer_common(const char *cmd, int af, unsigned ac, char **av)
 119 {
 120   struct addrinfo aihint = { 0 }, *ai0, *ai1;
 121   int len = PKBUFSZ, yes = 1;
 122   int err;
 123   peer *p;
 124   int fd;
 125
 126   if (ac != 4) die(1, "syntax: %s:NAME:PORT:ADDR:PORT", cmd);
 127   if (!key_bytag(&keys, av[0])) die(1, "no key named `%s'", av[0]);
 128   p = &peers[npeer++];
 129   p->name = xstrdup(av[0]);
 130   aihint.ai_family = af;
 131   aihint.ai_socktype = SOCK_DGRAM;
 132   aihint.ai_flags = AI_ADDRCONFIG;
 133   if ((err = getaddrinfo(av[2], av[3], &aihint, &ai1)) != 0)
 134     die(1, "getaddrinfo(`%s', `%s'): %s", av[2], av[3], gai_strerror(err));
 135   aihint.ai_family = ai1->ai_family;
 136   aihint.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
 137   if ((err = getaddrinfo(0, av[1], &aihint, &ai0)) != 0)
 138     die(1, "getaddrinfo(passive, `%s'): %s", av[1], gai_strerror(err));
 139   if ((fd = socket(ai1->ai_family, SOCK_DGRAM, ai1->ai_protocol)) < 0)
 140     die(1, "socket: %s", strerror(errno));
 141   if (ai1->ai_family == AF_INET6) {
 142     if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)))
 143       die(1, "setsockopt: %s", strerror(errno));
 144   }
 145   if (bind(fd, ai0->ai_addr, ai0->ai_addrlen))
 146     die(1, "bind: %s", strerror(errno));
 147   if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)) ||
 148       setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &len, sizeof(len)))
 149     die(1, "setsockopt: %s", strerror(errno));
 150   if (connect(fd, ai1->ai_addr, ai1->ai_addrlen))
 151     die(1, "connect: %s", strerror(errno));
 152   sel_initfile(&sel, &p->sf, fd, SEL_READ, dopacket, p);
 153   sel_addfile(&p->sf);
 154   freeaddrinfo(ai0); freeaddrinfo(ai1);
 155 }
 156
 157 static void addpeer(unsigned ac, char **av)
 158   { addpeer_common("peer", AF_UNSPEC, ac, av); }
 159 static void addpeer4(unsigned ac, char **av)
 160   { addpeer_common("peer4", AF_INET, ac, av); }
 161 static void addpeer6(unsigned ac, char **av)
 162   { addpeer_common("peer6", AF_INET6, ac, av); }
 163
 164 /*----- Fork filter -------------------------------------------------------*/
 165
 166 typedef struct forknode {
 167   struct forknode *next;
 168   filter *f;
 169 } forknode;
 170
 171 typedef struct forkfilt {
 172   const char *name;
 173   forknode *fn;
 174 } forkfilt;
 175
 176 static void dofork(filter *f, const octet *buf, size_t sz)
 177 {
 178   forkfilt *ff = f->state;
 179   forknode *fn;
 180   unsigned i = 0;
 181
 182   ff = f->state;
 183   for (fn = ff->fn; fn; fn = fn->next) {
 184     printf("fork branch %u of fork `%s'\n", i++, ff->name);
 185     PASS(fn->f, buf, sz);
 186   }
 187   printf("fork branch %u of fork `%s'\n", i++, ff->name);
 188   PASS(f->next, buf, sz);
 189 }
 190
 191 static void addfork(filter *f, unsigned ac, char **av)
 192 {
 193   forkfilt *ff;
 194   if (ac != 1) die(1, "syntax: filt:fork:NAME");
 195   ff = CREATE(forkfilt);
 196   ff->name = xstrdup(av[0]);
 197   ff->fn = 0;
 198   f->func = dofork;
 199   f->state = ff;
 200 }
 201
 202 static void nextfork(unsigned ac, char **av)
 203 {
 204   unsigned i, j;
 205   filter *f;
 206   forkfilt *ff;
 207   forknode *fn, **ffn;
 208   peer *p;
 209
 210   if (ac < 1) die(1, "syntax: next:NAME:...");
 211   for (i = 0; i < 2; i++) {
 212     p = &peers[i];
 213     for (f = p->f; f; f = f->next) {
 214       if (f->func != dofork) continue;
 215       ff = f->state;
 216       for (j = 0; j < ac; j++)
 217         if (strcmp(av[j], ff->name) == 0) goto match;
 218       continue;
 219     match:
 220       fn = CREATE(forknode);
 221       for (ffn = &ff->fn; *ffn; ffn = &(*ffn)->next);
 222       fn->f = f->next;
 223       f->next = 0;
 224       fn->next = 0;
 225       *ffn = fn;
 226     }
 227   }
 228 }
 229
 230 /*----- Corrupt filter ----------------------------------------------------*/
 231
 232 typedef struct corrupt {
 233   unsigned p_corrupt;
 234 } corrupt;
 235
 236 static void docorrupt(filter *f, const octet *buf, size_t sz)
 237 {
 238   corrupt *c = f->state;
 239   octet b[PKBUFSZ];
 240   memcpy(b, buf, sz);
 241
 242   while (!RND(c->p_corrupt)) {
 243     puts("corrupt packet");
 244     b[RND(sz)] ^= RND(256);
 245   }
 246   PASS(f->next, b, sz);
 247 }
 248
 249 static void addcorrupt(filter *f, unsigned ac, char **av)
 250 {
 251   corrupt *c;
 252   if (ac > 1) die(1, "syntax: filt:corrupt[:P-CORRUPT]");
 253   c = CREATE(corrupt);
 254   if (ac > 0) c->p_corrupt = atoi(av[0]);
 255   else c->p_corrupt = 5;
 256   f->state = c;
 257   f->func = docorrupt;
 258 }
 259
 260 /*----- Drop filter -------------------------------------------------------*/
 261
 262 typedef struct drop {
 263   unsigned p_drop;
 264 } drop;
 265
 266 static void dodrop(filter *f, const octet *buf, size_t sz)
 267 {
 268   drop *d = f->state;
 269
 270   if (!RND(d->p_drop)) puts("drop packet");
 271   else PASS(f->next, buf, sz);
 272 }
 273
 274 static void adddrop(filter *f, unsigned ac, char **av)
 275 {
 276   drop *d;
 277   if (ac > 1) die(1, "syntax: filt:drop[:P-DROP]");
 278   d = CREATE(drop);
 279   if (ac > 0) d->p_drop = atoi(av[0]);
 280   else d->p_drop = 5;
 281   f->state = d;
 282   f->func = dodrop;
 283 }
 284
 285 /*----- Delay filter ------------------------------------------------------*/
 286
 287 typedef struct delaynode {
 288   unsigned flag;
 289   sel_timer tm;
 290   unsigned i;
 291   struct delay *d;
 292   octet *buf;
 293   size_t sz;
 294   unsigned seq;
 295 } delaynode;
 296
 297 typedef struct delay {
 298   unsigned max, n;
 299   unsigned long t;
 300   unsigned p_replay;
 301   filter *f;
 302   delaynode *q;
 303 } delay;
 304
 305 static void dtimer(struct timeval *tv, void *vv);
 306
 307 static void dinsert(delaynode *dn)
 308 {
 309   struct timeval tv;
 310   sel_timer *ta, *tb;
 311   unsigned long tdelta = RND(dn->d->t);
 312   gettimeofday(&tv, 0);
 313   TV_ADDL(&tv, &tv, 0, tdelta);
 314   assert(!dn->flag);
 315   sel_addtimer(&sel, &dn->tm, &tv, dtimer, dn);
 316   dn->flag = 1;
 317   for (ta = tb = sel.timers; ta; ta = ta->next) {
 318     ta = ta->next; if (!ta) break; assert(ta != tb);
 319     ta = ta->next; if (!ta) break; assert(ta != tb);
 320     tb = tb->next;
 321   }
 322   printf(" delay %lu usecs", tdelta);
 323 }
 324
 325 static void dsend(delaynode *dn, unsigned force)
 326 {
 327   delay *d = dn->d;
 328   delaynode *ddn;
 329   unsigned i;
 330
 331   fputs(" send...\n", stdout);
 332   assert(dn->buf);
 333   PASS(d->f->next, dn->buf, dn->sz);
 334   fputs("delay ...", stdout);
 335   if (!force)
 336     dinsert(dn);
 337   else {
 338     xfree(dn->buf);
 339     dn->buf = 0;
 340     d->n--;
 341     if (dn->i < d->n) {
 342       ddn = &d->q[d->n];
 343       sel_rmtimer(&ddn->tm);
 344       sel_addtimer(&sel, &dn->tm, &ddn->tm.tv, dtimer, dn);
 345       dn->flag = 1;
 346       dn->buf = ddn->buf;
 347       dn->sz = ddn->sz;
 348       dn->seq = ddn->seq;
 349       ddn->buf = 0;
 350       ddn->flag = 0;
 351       printf(" move id %u from slot %u to slot %u", ddn->seq, ddn->i, dn->i);
 352     }
 353     for (i = 0; i < d->n; i++) assert(d->q[i].buf);
 354     fputs(" remove", stdout);
 355   }
 356 }
 357
 358 static void dtimer(struct timeval *tv, void *vv)
 359 {
 360   delaynode *dn = vv;
 361   printf("delay timer peer `%s' id %u slot %u",
 362          dn->d->f->p_from->name, dn->seq, dn->i);
 363   dn->flag = 0;
 364   dsend(dn, RND(dn->d->p_replay));
 365   fputc('\n', stdout);
 366 }
 367
 368 static void dodelay(filter *f, const octet *buf, size_t sz)
 369 {
 370   delay *d = f->state;
 371   delaynode *dn;
 372   static unsigned seq = 0;
 373
 374   fputs("delay", stdout);
 375   if (d->n == d->max) {
 376     dn = &d->q[RND(d->n)];
 377     printf(" force uid %u", dn->seq);
 378     sel_rmtimer(&dn->tm);
 379     dn->flag = 0;
 380     dsend(dn, 1);
 381     fputc(';', stdout);
 382   }
 383   dn = &d->q[d->n++];
 384   dn->seq = seq++;
 385   printf(" new id %u in slot %u", dn->seq, dn->i);
 386   dn->buf = xmalloc(sz);
 387   dn->sz = sz;
 388   memcpy(dn->buf, buf, sz);
 389   dinsert(dn);
 390   fputc('\n', stdout);
 391 }
 392
 393 static void adddelay(filter *f, unsigned ac, char **av)
 394 {
 395   delay *d;
 396   unsigned i;
 397
 398   if (ac < 1 || ac > 3) die(1, "syntax: filt:delay:QLEN[:MILLIS:P-REPLAY]");
 399   d = CREATE(delay);
 400   d->max = atoi(av[0]);
 401   if (ac > 1) d->t = strtoul(av[1], 0, 10);
 402   else d->t = 100;
 403   d->t *= 1000;
 404   if (ac > 2) d->p_replay = atoi(av[2]);
 405   else d->p_replay = 20;
 406   d->n = 0;
 407   d->q = xmalloc(d->max * sizeof(delaynode));
 408   d->f = f;
 409   f->state = d;
 410   f->func = dodelay;
 411   for (i = 0; i < d->max; i++) {
 412     d->q[i].d = d;
 413     d->q[i].i = i;
 414     d->q[i].buf = 0;
 415     d->q[i].flag = 0;
 416   }
 417 }
 418
 419 /*----- Filters -----------------------------------------------------------*/
 420
 421 static void dosend(filter *f, const octet *buf, size_t sz)
 422 {
 423   printf("send to `%s'\n", f->p_to->name);
 424   DISCARD(write(f->p_to->sf.fd, buf, sz));
 425 }
 426
 427 static void addsend(filter *f, unsigned ac, char **av)
 428 {
 429   if (ac) die(1, "syntax: filt:send");
 430   f->func = dosend;
 431 }
 432
 433 const struct filtab {
 434   const char *name;
 435   void (*func)(filter */*f*/, unsigned /*ac*/, char **/*av*/);
 436 } filtab[] = {
 437   { "send",     addsend },
 438   { "fork",     addfork },
 439   { "delay",    adddelay },
 440   { "drop",     adddrop },
 441   { "corrupt",  addcorrupt },
 442   { 0,          0 }
 443 };
 444
 445 static void dofilter(peer *from, peer *to, unsigned ac, char **av)
 446 {
 447   filter **ff, *f = CREATE(filter);
 448   const struct filtab *ft;
 449   if (ac < 1) die(1, "syntax: {l,r,}filt:NAME:...");
 450   f->next = 0;
 451   f->p_from = from;
 452   f->p_to = to;
 453   f->state = 0;
 454   for (ff = &from->f; *ff; ff = &(*ff)->next);
 455   *ff = f;
 456   for (ft = filtab; ft->name; ft++)
 457     if (strcmp(av[0], ft->name) == 0)
 458       { ft->func(f, ac - 1, av + 1); return; }
 459   die(1, "unknown filter `%s'", av[0]);
 460 }
 461
 462 /*----- Flooding ----------------------------------------------------------*/
 463
 464 typedef struct flood {
 465   peer *p;
 466   unsigned type;
 467   size_t sz;
 468   unsigned long t;
 469   sel_timer tm;
 470 } flood;
 471
 472 static void setflood(flood *f);
 473
 474 static void floodtimer(struct timeval *tv, void *vv)
 475 {
 476   flood *f = vv;
 477   octet buf[PKBUFSZ];
 478   size_t sz;
 479
 480   sz = RND(f->sz);
 481   sz += RND(f->sz);
 482   sz += RND(f->sz);
 483   sz += RND(f->sz);
 484   sz /= 2;
 485
 486   rng->ops->fill(rng, buf, sz);
 487   if (f->type < 0x100) buf[0] = f->type;
 488   puts("flood packet");
 489   PASS(f->p->f, buf, sz);
 490   setflood(f);
 491 }
 492
 493 static void setflood(flood *f)
 494 {
 495   struct timeval tv;
 496   gettimeofday(&tv, 0);
 497   TV_ADDL(&tv, &tv, 0, RND(f->t));
 498   sel_addtimer(&sel, &f->tm, &tv, floodtimer, f);
 499 }
 500
 501 static void doflood(peer *p, unsigned ac, char **av)
 502 {
 503   flood *f;
 504   if (ac > 3) die(1, "syntax: flood[:TYPE:MILLIS:SIZE]");
 505   f = CREATE(flood);
 506   f->p = p;
 507   if (ac > 0) f->type = strtoul(av[0], 0, 16);
 508   else f->type = 0x100;
 509   if (ac > 1) f->t = atoi(av[1]);
 510   else f->t = 10;
 511   if (ac > 2) f->sz = atoi(av[2]);
 512   else f->sz = 128;
 513   f->t *= 1000;
 514   setflood(f);
 515 }
 516
 517 /*----- Configuration commands --------------------------------------------*/
 518
 519 static void parse(char *p);
 520
 521 static void addflood(unsigned ac, char **av) {
 522   doflood(&peers[0], ac, av);
 523   doflood(&peers[1], ac, av);
 524 }
 525 static void addlflood(unsigned ac, char **av) {
 526   doflood(&peers[0], ac, av);
 527 }
 528 static void addrflood(unsigned ac, char **av) {
 529   doflood(&peers[1], ac, av);
 530 }
 531
 532 static void addfilter(unsigned ac, char **av) {
 533   dofilter(&peers[0], &peers[1], ac, av);
 534   dofilter(&peers[1], &peers[0], ac, av);
 535 }
 536 static void addlfilter(unsigned ac, char **av) {
 537   dofilter(&peers[0], &peers[1], ac, av);
 538 }
 539 static void addrfilter(unsigned ac, char **av) {
 540   dofilter(&peers[1], &peers[0], ac, av);
 541 }
 542
 543 static void include(unsigned ac, char **av)
 544 {
 545   FILE *fp;
 546   dstr d = DSTR_INIT;
 547   if (!ac) die(1, "syntax: include:FILE:...");
 548   while (*av) {
 549     if ((fp = fopen(*av, "r")) == 0)
 550       die(1, "fopen `%s': %s", *av, strerror(errno));
 551     while (dstr_putline(&d, fp) != EOF) { parse(d.buf); DRESET(&d); }
 552     fclose(fp);
 553     av++;
 554   }
 555 }
 556
 557 const struct cmdtab {
 558   const char *name;
 559   void (*func)(unsigned /*ac*/, char **/*av*/);
 560 } cmdtab[] = {
 561   { "peer",     addpeer },
 562   { "peer4",    addpeer4 },
 563   { "peer6",    addpeer6 },
 564   { "include",  include },
 565   { "filt",     addfilter },
 566   { "lfilt",    addlfilter },
 567   { "rfilt",    addrfilter },
 568   { "next",     nextfork },
 569   { "flood",    addflood },
 570   { "lflood",   addlflood },
 571   { "rflood",   addrflood },
 572   { 0,          0 }
 573 };
 574
 575 #define AVMAX 16
 576
 577 static void parse(char *p)
 578 {
 579   char *v[AVMAX];
 580   unsigned c = 0;
 581   const struct cmdtab *ct;
 582
 583   p = strtok(p, delim);
 584   if (!p || *p == '#') return;
 585   do {
 586     v[c++] = p;
 587     p = strtok(0, delim);
 588   } while (p && c < AVMAX - 1);
 589   v[c] = 0;
 590   for (ct = cmdtab; ct->name; ct++) {
 591     if (strcmp(ct->name, v[0]) == 0) {
 592       ct->func(c - 1, v + 1);
 593       return;
 594     }
 595   }
 596   die(1, "unknown command `%s'", v[0]);
 597 }
 598
 599 /*----- Main driver -------------------------------------------------------*/
 600
 601 static void version(FILE *fp)
 602   { pquis(fp, "$, TrIPE version " VERSION "\n"); }
 603
 604 static void usage(FILE *fp)
 605   { pquis(fp, "Usage: $ [-d CHAR] [-k KEYRING] DIRECTIVE...\n"); }
 606
 607 static void help(FILE *fp)
 608 {
 609   version(fp);
 610   putc('\n', fp);
 611   usage(fp);
 612   fputs("\n\
 613 Options:\n\
 614 \n\
 615 -h, --help              Show this help text.\n\
 616 -v, --version           Show the version number.\n\
 617 -u, --usage             Show terse usage summary.\n\
 618 \n\
 619 -d, --delimiter=CHAR    Use CHAR rather than `:' as delimiter.\n\
 620 -k, --keyring=FILE      Fetch keys from FILE.\n\
 621 \n\
 622 Directives:\n\
 623   peer{,4,6}:NAME:LOCAL-PORT:REMOTE-ADDR:REMOTE-PORT\n\
 624   include:FILE\n\
 625   {,l,r}filt:FILTER:ARGS:...\n\
 626   next:TAG\n\
 627   {,l,r}flood:TYPE:MILLIS:SIZE\n\
 628 \n\
 629 Filters:\n\
 630   send\n\
 631   fork:TAG\n\
 632   delay:QLEN[:MILLIS:P-REPLAY]\n\
 633   drop[:P-DROP]\n\
 634   corrupt[:P-CORRUPT]\n",
 635         fp);
 636 }
 637
 638 int main(int argc, char *argv[])
 639 {
 640   const char *kfname = "keyring.pub";
 641   int i;
 642   unsigned f = 0;
 643   char buf[32];
 644   static octet zero[CHACHA_NONCESZ];
 645
 646 #define f_bogus 1u
 647
 648   ego(argv[0]);
 649   for (;;) {
 650     static const struct option opt[] = {
 651       { "help",         0,              0,      'h' },
 652       { "version",      0,              0,      'v' },
 653       { "usage",        0,              0,      'u' },
 654       { "delimiter",    OPTF_ARGREQ,    0,      'd' },
 655       { "keyring",      OPTF_ARGREQ,    0,      'k' },
 656       { 0,              0,              0,      0 }
 657     };
 658     if ((i = mdwopt(argc, argv, "hvud:k:", opt, 0, 0, 0)) < 0) break;
 659     switch (i) {
 660       case 'h': help(stdout); exit(0);
 661       case 'v': version(stdout); exit(0);
 662       case 'u': usage(stdout); exit(0);
 663       case 'd':
 664         if (!optarg[0] || optarg[1])
 665           die(1, "delimiter must be a single character");
 666         delim = optarg;
 667         break;
 668       case 'k': kfname = optarg; break;
 669       default: f |= f_bogus; break;
 670     }
 671   }
 672   if (f & f_bogus) { usage(stderr); exit(1); }
 673
 674   rand_noisesrc(RAND_GLOBAL, &noise_source);
 675   rand_seed(RAND_GLOBAL, 256);
 676   rand_get(RAND_GLOBAL, buf, sizeof(buf));
 677   rng = chacha20_rand(buf, sizeof(buf), zero);
 678   sel_init(&sel);
 679   if (key_open(&keys, kfname, KOPEN_READ, key_moan, 0))
 680     die(1, "couldn't open `%s': %s", kfname, strerror(errno));
 681   for (i = optind; i < argc; i++) parse(argv[i]);
 682   if (npeer != 2) die(1, "need two peers");
 683   for (;;) {
 684     if (sel_select(&sel) && errno != EINTR)
 685       die(1, "select failed: %s", strerror(errno));
 686   }
 687
 688 #undef f_bogus
 689 }
 690
 691 /*----- That's all, folks -------------------------------------------------*/