slirp/misc.c

   1 /*
   2  * Copyright (c) 1995 Danny Gasparovski.
   3  *
   4  * Please read the file COPYRIGHT for the
   5  * terms and conditions of the copyright.
   6  */
   7
   8 #define WANT_SYS_IOCTL_H
   9 #include <slirp.h>
  10
  11 u_int curtime, time_fasttimo, last_slowtimo;
  12
  13 #if 0
  14 int x_port = -1;
  15 int x_display = 0;
  16 int x_screen = 0;
  17
  18 int
  19 show_x(buff, inso)
  20         char *buff;
  21         struct socket *inso;
  22 {
  23         if (x_port < 0) {
  24                 lprint("X Redir: X not being redirected.\r\n");
  25         } else {
  26                 lprint("X Redir: In sh/bash/zsh/etc. type: DISPLAY=%s:%d.%d; export DISPLAY\r\n",
  27                       inet_ntoa(our_addr), x_port, x_screen);
  28                 lprint("X Redir: In csh/tcsh/etc. type:    setenv DISPLAY %s:%d.%d\r\n",
  29                       inet_ntoa(our_addr), x_port, x_screen);
  30                 if (x_display)
  31                    lprint("X Redir: Redirecting to display %d\r\n", x_display);
  32         }
  33
  34         return CFG_OK;
  35 }
  36
  37
  38 /*
  39  * XXX Allow more than one X redirection?
  40  */
  41 void
  42 redir_x(inaddr, start_port, display, screen)
  43         u_int32_t inaddr;
  44         int start_port;
  45         int display;
  46         int screen;
  47 {
  48         int i;
  49
  50         if (x_port >= 0) {
  51                 lprint("X Redir: X already being redirected.\r\n");
  52                 show_x(0, 0);
  53         } else {
  54                 for (i = 6001 + (start_port-1); i <= 6100; i++) {
  55                         if (solisten(htons(i), inaddr, htons(6000 + display), 0)) {
  56                                 /* Success */
  57                                 x_port = i - 6000;
  58                                 x_display = display;
  59                                 x_screen = screen;
  60                                 show_x(0, 0);
  61                                 return;
  62                         }
  63                 }
  64                 lprint("X Redir: Error: Couldn't redirect a port for X. Weird.\r\n");
  65         }
  66 }
  67 #endif
  68
  69 #ifndef HAVE_INET_ATON
  70 int
  71 inet_aton(cp, ia)
  72         const char *cp;
  73         struct in_addr *ia;
  74 {
  75         u_int32_t addr = inet_addr(cp);
  76         if (addr == 0xffffffff)
  77                 return 0;
  78         ia->s_addr = addr;
  79         return 1;
  80 }
  81 #endif
  82
  83 /*
  84  * Get our IP address and put it in our_addr
  85  */
  86 void
  87 getouraddr()
  88 {
  89         char buff[256];
  90         struct hostent *he = NULL;
  91
  92         if (gethostname(buff,256) == 0)
  93             he = gethostbyname(buff);
  94         if (he)
  95             our_addr = *(struct in_addr *)he->h_addr;
  96         if (our_addr.s_addr == 0)
  97             our_addr.s_addr = loopback_addr.s_addr;
  98 }
  99
 100 #if SIZEOF_CHAR_P == 8
 101
 102 struct quehead_32 {
 103         u_int32_t qh_link;
 104         u_int32_t qh_rlink;
 105 };
 106
 107 inline void
 108 insque_32(a, b)
 109         void *a;
 110         void *b;
 111 {
 112         register struct quehead_32 *element = (struct quehead_32 *) a;
 113         register struct quehead_32 *head = (struct quehead_32 *) b;
 114         element->qh_link = head->qh_link;
 115         head->qh_link = (u_int32_t)element;
 116         element->qh_rlink = (u_int32_t)head;
 117         ((struct quehead_32 *)(element->qh_link))->qh_rlink
 118         = (u_int32_t)element;
 119 }
 120
 121 inline void
 122 remque_32(a)
 123         void *a;
 124 {
 125         register struct quehead_32 *element = (struct quehead_32 *) a;
 126         ((struct quehead_32 *)(element->qh_link))->qh_rlink = element->qh_rlink;
 127         ((struct quehead_32 *)(element->qh_rlink))->qh_link = element->qh_link;
 128         element->qh_rlink = 0;
 129 }
 130
 131 #endif /* SIZEOF_CHAR_P == 8 */
 132
 133 struct quehead {
 134         struct quehead *qh_link;
 135         struct quehead *qh_rlink;
 136 };
 137
 138 inline void
 139 insque(a, b)
 140         void *a, *b;
 141 {
 142         register struct quehead *element = (struct quehead *) a;
 143         register struct quehead *head = (struct quehead *) b;
 144         element->qh_link = head->qh_link;
 145         head->qh_link = (struct quehead *)element;
 146         element->qh_rlink = (struct quehead *)head;
 147         ((struct quehead *)(element->qh_link))->qh_rlink
 148         = (struct quehead *)element;
 149 }
 150
 151 inline void
 152 remque(a)
 153      void *a;
 154 {
 155   register struct quehead *element = (struct quehead *) a;
 156   ((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
 157   ((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
 158   element->qh_rlink = NULL;
 159   /*  element->qh_link = NULL;  TCP FIN1 crashes if you do this.  Why ? */
 160 }
 161
 162 /* #endif */
 163
 164
 165 int
 166 add_exec(ex_ptr, do_pty, exec, addr, port)
 167         struct ex_list **ex_ptr;
 168         int do_pty;
 169         char *exec;
 170         int addr;
 171         int port;
 172 {
 173         struct ex_list *tmp_ptr;
 174
 175         /* First, check if the port is "bound" */
 176         for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
 177                 if (port == tmp_ptr->ex_fport && addr == tmp_ptr->ex_addr)
 178                    return -1;
 179         }
 180
 181         tmp_ptr = *ex_ptr;
 182         *ex_ptr = (struct ex_list *)malloc(sizeof(struct ex_list));
 183         (*ex_ptr)->ex_fport = port;
 184         (*ex_ptr)->ex_addr = addr;
 185         (*ex_ptr)->ex_pty = do_pty;
 186         (*ex_ptr)->ex_exec = strdup(exec);
 187         (*ex_ptr)->ex_next = tmp_ptr;
 188         return 0;
 189 }
 190
 191 #ifndef HAVE_STRERROR
 192
 193 /*
 194  * For systems with no strerror
 195  */
 196
 197 extern int sys_nerr;
 198 extern char *sys_errlist[];
 199
 200 char *
 201 strerror(error)
 202         int error;
 203 {
 204         if (error < sys_nerr)
 205            return sys_errlist[error];
 206         else
 207            return "Unknown error.";
 208 }
 209
 210 #endif
 211
 212
 213 #ifdef _WIN32
 214
 215 int
 216 fork_exec(struct socket *so, const char *ex, int do_pty)
 217 {
 218     /* not implemented */
 219     return 0;
 220 }
 221
 222 #else
 223
 224 #ifndef CONFIG_QEMU
 225 int
 226 slirp_openpty(amaster, aslave)
 227      int *amaster, *aslave;
 228 {
 229         register int master, slave;
 230
 231 #ifdef HAVE_GRANTPT
 232         char *ptr;
 233
 234         if ((master = open("/dev/ptmx", O_RDWR)) < 0 ||
 235             grantpt(master) < 0 ||
 236             unlockpt(master) < 0 ||
 237             (ptr = ptsname(master)) == NULL)  {
 238                 close(master);
 239                 return -1;
 240         }
 241
 242         if ((slave = open(ptr, O_RDWR)) < 0 ||
 243             ioctl(slave, I_PUSH, "ptem") < 0 ||
 244             ioctl(slave, I_PUSH, "ldterm") < 0 ||
 245             ioctl(slave, I_PUSH, "ttcompat") < 0) {
 246                 close(master);
 247                 close(slave);
 248                 return -1;
 249         }
 250
 251         *amaster = master;
 252         *aslave = slave;
 253         return 0;
 254
 255 #else
 256
 257         static char line[] = "/dev/ptyXX";
 258         register const char *cp1, *cp2;
 259
 260         for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
 261                 line[8] = *cp1;
 262                 for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
 263                         line[9] = *cp2;
 264                         if ((master = open(line, O_RDWR, 0)) == -1) {
 265                                 if (errno == ENOENT)
 266                                    return (-1);    /* out of ptys */
 267                         } else {
 268                                 line[5] = 't';
 269                                 /* These will fail */
 270                                 (void) chown(line, getuid(), 0);
 271                                 (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
 272 #ifdef HAVE_REVOKE
 273                                 (void) revoke(line);
 274 #endif
 275                                 if ((slave = open(line, O_RDWR, 0)) != -1) {
 276                                         *amaster = master;
 277                                         *aslave = slave;
 278                                         return 0;
 279                                 }
 280                                 (void) close(master);
 281                                 line[5] = 'p';
 282                         }
 283                 }
 284         }
 285         errno = ENOENT; /* out of ptys */
 286         return (-1);
 287 #endif
 288 }
 289 #endif
 290
 291 /*
 292  * XXX This is ugly
 293  * We create and bind a socket, then fork off to another
 294  * process, which connects to this socket, after which we
 295  * exec the wanted program.  If something (strange) happens,
 296  * the accept() call could block us forever.
 297  *
 298  * do_pty = 0   Fork/exec inetd style
 299  * do_pty = 1   Fork/exec using slirp.telnetd
 300  * do_ptr = 2   Fork/exec using pty
 301  */
 302 int
 303 fork_exec(struct socket *so, const char *ex, int do_pty)
 304 {
 305         int s;
 306         struct sockaddr_in addr;
 307         int addrlen = sizeof(addr);
 308         int opt;
 309         int master = -1;
 310         char *argv[256];
 311 #if 0
 312         char buff[256];
 313 #endif
 314         /* don't want to clobber the original */
 315         char *bptr;
 316         const char *curarg;
 317         int c, i, ret;
 318
 319         DEBUG_CALL("fork_exec");
 320         DEBUG_ARG("so = %lx", (long)so);
 321         DEBUG_ARG("ex = %lx", (long)ex);
 322         DEBUG_ARG("do_pty = %lx", (long)do_pty);
 323
 324         if (do_pty == 2) {
 325 #if 0
 326                 if (slirp_openpty(&master, &s) == -1) {
 327                         lprint("Error: openpty failed: %s\n", strerror(errno));
 328                         return 0;
 329                 }
 330 #endif
 331         } else {
 332                 addr.sin_family = AF_INET;
 333                 addr.sin_port = 0;
 334                 addr.sin_addr.s_addr = INADDR_ANY;
 335
 336                 if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
 337                     bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
 338                     listen(s, 1) < 0) {
 339                         lprint("Error: inet socket: %s\n", strerror(errno));
 340                         closesocket(s);
 341
 342                         return 0;
 343                 }
 344         }
 345
 346         switch(fork()) {
 347          case -1:
 348                 lprint("Error: fork failed: %s\n", strerror(errno));
 349                 close(s);
 350                 if (do_pty == 2)
 351                    close(master);
 352                 return 0;
 353
 354          case 0:
 355                 /* Set the DISPLAY */
 356                 if (do_pty == 2) {
 357                         (void) close(master);
 358 #ifdef TIOCSCTTY /* XXXXX */
 359                         (void) setsid();
 360                         ioctl(s, TIOCSCTTY, (char *)NULL);
 361 #endif
 362                 } else {
 363                         getsockname(s, (struct sockaddr *)&addr, &addrlen);
 364                         close(s);
 365                         /*
 366                          * Connect to the socket
 367                          * XXX If any of these fail, we're in trouble!
 368                          */
 369                         s = socket(AF_INET, SOCK_STREAM, 0);
 370                         addr.sin_addr = loopback_addr;
 371                         do {
 372                             ret = connect(s, (struct sockaddr *)&addr, addrlen);
 373                         } while (ret < 0 && errno == EINTR);
 374                 }
 375
 376 #if 0
 377                 if (x_port >= 0) {
 378 #ifdef HAVE_SETENV
 379                         sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
 380                         setenv("DISPLAY", buff, 1);
 381 #else
 382                         sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
 383                         putenv(buff);
 384 #endif
 385                 }
 386 #endif
 387                 dup2(s, 0);
 388                 dup2(s, 1);
 389                 dup2(s, 2);
 390                 for (s = getdtablesize() - 1; s >= 3; s--)
 391                    close(s);
 392
 393                 i = 0;
 394                 bptr = strdup(ex); /* No need to free() this */
 395                 if (do_pty == 1) {
 396                         /* Setup "slirp.telnetd -x" */
 397                         argv[i++] = "slirp.telnetd";
 398                         argv[i++] = "-x";
 399                         argv[i++] = bptr;
 400                 } else
 401                    do {
 402                         /* Change the string into argv[] */
 403                         curarg = bptr;
 404                         while (*bptr != ' ' && *bptr != (char)0)
 405                            bptr++;
 406                         c = *bptr;
 407                         *bptr++ = (char)0;
 408                         argv[i++] = strdup(curarg);
 409                    } while (c);
 410
 411                 argv[i] = 0;
 412                 execvp(argv[0], argv);
 413
 414                 /* Ooops, failed, let's tell the user why */
 415                   {
 416                           char buff[256];
 417
 418                           sprintf(buff, "Error: execvp of %s failed: %s\n",
 419                                   argv[0], strerror(errno));
 420                           write(2, buff, strlen(buff)+1);
 421                   }
 422                 close(0); close(1); close(2); /* XXX */
 423                 exit(1);
 424
 425          default:
 426                 if (do_pty == 2) {
 427                         close(s);
 428                         so->s = master;
 429                 } else {
 430                         /*
 431                          * XXX this could block us...
 432                          * XXX Should set a timer here, and if accept() doesn't
 433                          * return after X seconds, declare it a failure
 434                          * The only reason this will block forever is if socket()
 435                          * of connect() fail in the child process
 436                          */
 437                         do {
 438                             so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
 439                         } while (so->s < 0 && errno == EINTR);
 440                         closesocket(s);
 441                         opt = 1;
 442                         setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
 443                         opt = 1;
 444                         setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
 445                 }
 446                 fd_nonblock(so->s);
 447
 448                 /* Append the telnet options now */
 449                 if (so->so_m != 0 && do_pty == 1)  {
 450                         sbappend(so, so->so_m);
 451                         so->so_m = 0;
 452                 }
 453
 454                 return 1;
 455         }
 456 }
 457 #endif
 458
 459 #ifndef HAVE_STRDUP
 460 char *
 461 strdup(str)
 462         const char *str;
 463 {
 464         char *bptr;
 465
 466         bptr = (char *)malloc(strlen(str)+1);
 467         strcpy(bptr, str);
 468
 469         return bptr;
 470 }
 471 #endif
 472
 473 #if 0
 474 void
 475 snooze_hup(num)
 476         int num;
 477 {
 478         int s, ret;
 479 #ifndef NO_UNIX_SOCKETS
 480         struct sockaddr_un sock_un;
 481 #endif
 482         struct sockaddr_in sock_in;
 483         char buff[256];
 484
 485         ret = -1;
 486         if (slirp_socket_passwd) {
 487                 s = socket(AF_INET, SOCK_STREAM, 0);
 488                 if (s < 0)
 489                    slirp_exit(1);
 490                 sock_in.sin_family = AF_INET;
 491                 sock_in.sin_addr.s_addr = slirp_socket_addr;
 492                 sock_in.sin_port = htons(slirp_socket_port);
 493                 if (connect(s, (struct sockaddr *)&sock_in, sizeof(sock_in)) != 0)
 494                    slirp_exit(1); /* just exit...*/
 495                 sprintf(buff, "kill %s:%d", slirp_socket_passwd, slirp_socket_unit);
 496                 write(s, buff, strlen(buff)+1);
 497         }
 498 #ifndef NO_UNIX_SOCKETS
 499           else {
 500                 s = socket(AF_UNIX, SOCK_STREAM, 0);
 501                 if (s < 0)
 502                    slirp_exit(1);
 503                 sock_un.sun_family = AF_UNIX;
 504                 strcpy(sock_un.sun_path, socket_path);
 505                 if (connect(s, (struct sockaddr *)&sock_un,
 506                               sizeof(sock_un.sun_family) + sizeof(sock_un.sun_path)) != 0)
 507                    slirp_exit(1);
 508                 sprintf(buff, "kill none:%d", slirp_socket_unit);
 509                 write(s, buff, strlen(buff)+1);
 510         }
 511 #endif
 512         slirp_exit(0);
 513 }
 514
 515
 516 void
 517 snooze()
 518 {
 519         sigset_t s;
 520         int i;
 521
 522         /* Don't need our data anymore */
 523         /* XXX This makes SunOS barf */
 524 /*      brk(0); */
 525
 526         /* Close all fd's */
 527         for (i = 255; i >= 0; i--)
 528            close(i);
 529
 530         signal(SIGQUIT, slirp_exit);
 531         signal(SIGHUP, snooze_hup);
 532         sigemptyset(&s);
 533
 534         /* Wait for any signal */
 535         sigsuspend(&s);
 536
 537         /* Just in case ... */
 538         exit(255);
 539 }
 540
 541 void
 542 relay(s)
 543         int s;
 544 {
 545         char buf[8192];
 546         int n;
 547         fd_set readfds;
 548         struct ttys *ttyp;
 549
 550         /* Don't need our data anymore */
 551         /* XXX This makes SunOS barf */
 552 /*      brk(0); */
 553
 554         signal(SIGQUIT, slirp_exit);
 555         signal(SIGHUP, slirp_exit);
 556         signal(SIGINT, slirp_exit);
 557         signal(SIGTERM, slirp_exit);
 558
 559         /* Fudge to get term_raw and term_restore to work */
 560         if (NULL == (ttyp = tty_attach (0, slirp_tty))) {
 561          lprint ("Error: tty_attach failed in misc.c:relay()\r\n");
 562          slirp_exit (1);
 563     }
 564         ttyp->fd = 0;
 565         ttyp->flags |= TTY_CTTY;
 566         term_raw(ttyp);
 567
 568         while (1) {
 569                 FD_ZERO(&readfds);
 570
 571                 FD_SET(0, &readfds);
 572                 FD_SET(s, &readfds);
 573
 574                 n = select(s+1, &readfds, (fd_set *)0, (fd_set *)0, (struct timeval *)0);
 575
 576                 if (n <= 0)
 577                    slirp_exit(0);
 578
 579                 if (FD_ISSET(0, &readfds)) {
 580                         n = read(0, buf, 8192);
 581                         if (n <= 0)
 582                            slirp_exit(0);
 583                         n = writen(s, buf, n);
 584                         if (n <= 0)
 585                            slirp_exit(0);
 586                 }
 587
 588                 if (FD_ISSET(s, &readfds)) {
 589                         n = read(s, buf, 8192);
 590                         if (n <= 0)
 591                            slirp_exit(0);
 592                         n = writen(0, buf, n);
 593                         if (n <= 0)
 594                            slirp_exit(0);
 595                 }
 596         }
 597
 598         /* Just in case.... */
 599         exit(1);
 600 }
 601 #endif
 602
 603 #ifdef CONFIG_QEMU
 604 extern void term_vprintf(const char *fmt, va_list ap);
 605
 606 void lprint(const char *format, ...)
 607 {
 608     va_list args;
 609
 610     va_start(args, format);
 611     term_vprintf(format, args);
 612     va_end(args);
 613 }
 614 #else
 615 int (*lprint_print) _P((void *, const char *, va_list));
 616 char *lprint_ptr, *lprint_ptr2, **lprint_arg;
 617
 618 void
 619 #ifdef __STDC__
 620 lprint(const char *format, ...)
 621 #else
 622 lprint(va_alist) va_dcl
 623 #endif
 624 {
 625         va_list args;
 626
 627 #ifdef __STDC__
 628         va_start(args, format);
 629 #else
 630         char *format;
 631         va_start(args);
 632         format = va_arg(args, char *);
 633 #endif
 634 #if 0
 635         /* If we're printing to an sbuf, make sure there's enough room */
 636         /* XXX +100? */
 637         if (lprint_sb) {
 638                 if ((lprint_ptr - lprint_sb->sb_wptr) >=
 639                     (lprint_sb->sb_datalen - (strlen(format) + 100))) {
 640                         int deltaw = lprint_sb->sb_wptr - lprint_sb->sb_data;
 641                         int deltar = lprint_sb->sb_rptr - lprint_sb->sb_data;
 642                         int deltap = lprint_ptr -         lprint_sb->sb_data;
 643
 644                         lprint_sb->sb_data = (char *)realloc(lprint_sb->sb_data,
 645                                                              lprint_sb->sb_datalen + TCP_SNDSPACE);
 646
 647                         /* Adjust all values */
 648                         lprint_sb->sb_wptr = lprint_sb->sb_data + deltaw;
 649                         lprint_sb->sb_rptr = lprint_sb->sb_data + deltar;
 650                         lprint_ptr =         lprint_sb->sb_data + deltap;
 651
 652                         lprint_sb->sb_datalen += TCP_SNDSPACE;
 653                 }
 654         }
 655 #endif
 656         if (lprint_print)
 657            lprint_ptr += (*lprint_print)(*lprint_arg, format, args);
 658
 659         /* Check if they want output to be logged to file as well */
 660         if (lfd) {
 661                 /*
 662                  * Remove \r's
 663                  * otherwise you'll get ^M all over the file
 664                  */
 665                 int len = strlen(format);
 666                 char *bptr1, *bptr2;
 667
 668                 bptr1 = bptr2 = strdup(format);
 669
 670                 while (len--) {
 671                         if (*bptr1 == '\r')
 672                            memcpy(bptr1, bptr1+1, len+1);
 673                         else
 674                            bptr1++;
 675                 }
 676                 vfprintf(lfd, bptr2, args);
 677                 free(bptr2);
 678         }
 679         va_end(args);
 680 }
 681
 682 void
 683 add_emu(buff)
 684         char *buff;
 685 {
 686         u_int lport, fport;
 687         u_int8_t tos = 0, emu = 0;
 688         char buff1[256], buff2[256], buff4[128];
 689         char *buff3 = buff4;
 690         struct emu_t *emup;
 691         struct socket *so;
 692
 693         if (sscanf(buff, "%256s %256s", buff2, buff1) != 2) {
 694                 lprint("Error: Bad arguments\r\n");
 695                 return;
 696         }
 697
 698         if (sscanf(buff1, "%d:%d", &lport, &fport) != 2) {
 699                 lport = 0;
 700                 if (sscanf(buff1, "%d", &fport) != 1) {
 701                         lprint("Error: Bad first argument\r\n");
 702                         return;
 703                 }
 704         }
 705
 706         if (sscanf(buff2, "%128[^:]:%128s", buff1, buff3) != 2) {
 707                 buff3 = 0;
 708                 if (sscanf(buff2, "%256s", buff1) != 1) {
 709                         lprint("Error: Bad second argument\r\n");
 710                         return;
 711                 }
 712         }
 713
 714         if (buff3) {
 715                 if (strcmp(buff3, "lowdelay") == 0)
 716                    tos = IPTOS_LOWDELAY;
 717                 else if (strcmp(buff3, "throughput") == 0)
 718                    tos = IPTOS_THROUGHPUT;
 719                 else {
 720                         lprint("Error: Expecting \"lowdelay\"/\"throughput\"\r\n");
 721                         return;
 722                 }
 723         }
 724
 725         if (strcmp(buff1, "ftp") == 0)
 726            emu = EMU_FTP;
 727         else if (strcmp(buff1, "irc") == 0)
 728            emu = EMU_IRC;
 729         else if (strcmp(buff1, "none") == 0)
 730            emu = EMU_NONE; /* ie: no emulation */
 731         else {
 732                 lprint("Error: Unknown service\r\n");
 733                 return;
 734         }
 735
 736         /* First, check that it isn't already emulated */
 737         for (emup = tcpemu; emup; emup = emup->next) {
 738                 if (emup->lport == lport && emup->fport == fport) {
 739                         lprint("Error: port already emulated\r\n");
 740                         return;
 741                 }
 742         }
 743
 744         /* link it */
 745         emup = (struct emu_t *)malloc(sizeof (struct emu_t));
 746         emup->lport = (u_int16_t)lport;
 747         emup->fport = (u_int16_t)fport;
 748         emup->tos = tos;
 749         emup->emu = emu;
 750         emup->next = tcpemu;
 751         tcpemu = emup;
 752
 753         /* And finally, mark all current sessions, if any, as being emulated */
 754         for (so = tcb.so_next; so != &tcb; so = so->so_next) {
 755                 if ((lport && lport == ntohs(so->so_lport)) ||
 756                     (fport && fport == ntohs(so->so_fport))) {
 757                         if (emu)
 758                            so->so_emu = emu;
 759                         if (tos)
 760                            so->so_iptos = tos;
 761                 }
 762         }
 763
 764         lprint("Adding emulation for %s to port %d/%d\r\n", buff1, emup->lport, emup->fport);
 765 }
 766 #endif
 767
 768 #ifdef BAD_SPRINTF
 769
 770 #undef vsprintf
 771 #undef sprintf
 772
 773 /*
 774  * Some BSD-derived systems have a sprintf which returns char *
 775  */
 776
 777 int
 778 vsprintf_len(string, format, args)
 779         char *string;
 780         const char *format;
 781         va_list args;
 782 {
 783         vsprintf(string, format, args);
 784         return strlen(string);
 785 }
 786
 787 int
 788 #ifdef __STDC__
 789 sprintf_len(char *string, const char *format, ...)
 790 #else
 791 sprintf_len(va_alist) va_dcl
 792 #endif
 793 {
 794         va_list args;
 795 #ifdef __STDC__
 796         va_start(args, format);
 797 #else
 798         char *string;
 799         char *format;
 800         va_start(args);
 801         string = va_arg(args, char *);
 802         format = va_arg(args, char *);
 803 #endif
 804         vsprintf(string, format, args);
 805         return strlen(string);
 806 }
 807
 808 #endif
 809
 810 void
 811 u_sleep(usec)
 812         int usec;
 813 {
 814         struct timeval t;
 815         fd_set fdset;
 816
 817         FD_ZERO(&fdset);
 818
 819         t.tv_sec = 0;
 820         t.tv_usec = usec * 1000;
 821
 822         select(0, &fdset, &fdset, &fdset, &t);
 823 }
 824
 825 /*
 826  * Set fd blocking and non-blocking
 827  */
 828
 829 void
 830 fd_nonblock(fd)
 831         int fd;
 832 {
 833 #ifdef FIONBIO
 834         int opt = 1;
 835
 836         ioctlsocket(fd, FIONBIO, &opt);
 837 #else
 838         int opt;
 839
 840         opt = fcntl(fd, F_GETFL, 0);
 841         opt |= O_NONBLOCK;
 842         fcntl(fd, F_SETFL, opt);
 843 #endif
 844 }
 845
 846 void
 847 fd_block(fd)
 848         int fd;
 849 {
 850 #ifdef FIONBIO
 851         int opt = 0;
 852
 853         ioctlsocket(fd, FIONBIO, &opt);
 854 #else
 855         int opt;
 856
 857         opt = fcntl(fd, F_GETFL, 0);
 858         opt &= ~O_NONBLOCK;
 859         fcntl(fd, F_SETFL, opt);
 860 #endif
 861 }
 862
 863
 864 #if 0
 865 /*
 866  * invoke RSH
 867  */
 868 int
 869 rsh_exec(so,ns, user, host, args)
 870         struct socket *so;
 871         struct socket *ns;
 872         char *user;
 873         char *host;
 874         char *args;
 875 {
 876         int fd[2];
 877         int fd0[2];
 878         int s;
 879         char buff[256];
 880
 881         DEBUG_CALL("rsh_exec");
 882         DEBUG_ARG("so = %lx", (long)so);
 883
 884         if (pipe(fd)<0) {
 885           lprint("Error: pipe failed: %s\n", strerror(errno));
 886           return 0;
 887         }
 888 /* #ifdef HAVE_SOCKETPAIR */
 889 #if 1
 890         if (socketpair(PF_UNIX,SOCK_STREAM,0, fd0) == -1) {
 891           close(fd[0]);
 892           close(fd[1]);
 893           lprint("Error: openpty failed: %s\n", strerror(errno));
 894           return 0;
 895         }
 896 #else
 897         if (slirp_openpty(&fd0[0], &fd0[1]) == -1) {
 898           close(fd[0]);
 899           close(fd[1]);
 900           lprint("Error: openpty failed: %s\n", strerror(errno));
 901           return 0;
 902         }
 903 #endif
 904
 905         switch(fork()) {
 906          case -1:
 907            lprint("Error: fork failed: %s\n", strerror(errno));
 908            close(fd[0]);
 909            close(fd[1]);
 910            close(fd0[0]);
 911            close(fd0[1]);
 912            return 0;
 913
 914          case 0:
 915            close(fd[0]);
 916            close(fd0[0]);
 917
 918                 /* Set the DISPLAY */
 919            if (x_port >= 0) {
 920 #ifdef HAVE_SETENV
 921              sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
 922              setenv("DISPLAY", buff, 1);
 923 #else
 924              sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
 925              putenv(buff);
 926 #endif
 927            }
 928
 929            dup2(fd0[1], 0);
 930            dup2(fd0[1], 1);
 931            dup2(fd[1], 2);
 932            for (s = 3; s <= 255; s++)
 933              close(s);
 934
 935            execlp("rsh","rsh","-l", user, host, args, NULL);
 936
 937            /* Ooops, failed, let's tell the user why */
 938
 939            sprintf(buff, "Error: execlp of %s failed: %s\n",
 940                    "rsh", strerror(errno));
 941            write(2, buff, strlen(buff)+1);
 942            close(0); close(1); close(2); /* XXX */
 943            exit(1);
 944
 945         default:
 946           close(fd[1]);
 947           close(fd0[1]);
 948           ns->s=fd[0];
 949           so->s=fd0[0];
 950
 951           return 1;
 952         }
 953 }
 954 #endif