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         socklen_t 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 #else
 331                 return 0;
 332 #endif
 333         } else {
 334                 addr.sin_family = AF_INET;
 335                 addr.sin_port = 0;
 336                 addr.sin_addr.s_addr = INADDR_ANY;
 337
 338                 if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
 339                     bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
 340                     listen(s, 1) < 0) {
 341                         lprint("Error: inet socket: %s\n", strerror(errno));
 342                         closesocket(s);
 343
 344                         return 0;
 345                 }
 346         }
 347
 348         switch(fork()) {
 349          case -1:
 350                 lprint("Error: fork failed: %s\n", strerror(errno));
 351                 close(s);
 352                 if (do_pty == 2)
 353                    close(master);
 354                 return 0;
 355
 356          case 0:
 357                 /* Set the DISPLAY */
 358                 if (do_pty == 2) {
 359                         (void) close(master);
 360 #ifdef TIOCSCTTY /* XXXXX */
 361                         (void) setsid();
 362                         ioctl(s, TIOCSCTTY, (char *)NULL);
 363 #endif
 364                 } else {
 365                         getsockname(s, (struct sockaddr *)&addr, &addrlen);
 366                         close(s);
 367                         /*
 368                          * Connect to the socket
 369                          * XXX If any of these fail, we're in trouble!
 370                          */
 371                         s = socket(AF_INET, SOCK_STREAM, 0);
 372                         addr.sin_addr = loopback_addr;
 373                         do {
 374                             ret = connect(s, (struct sockaddr *)&addr, addrlen);
 375                         } while (ret < 0 && errno == EINTR);
 376                 }
 377
 378 #if 0
 379                 if (x_port >= 0) {
 380 #ifdef HAVE_SETENV
 381                         sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
 382                         setenv("DISPLAY", buff, 1);
 383 #else
 384                         sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
 385                         putenv(buff);
 386 #endif
 387                 }
 388 #endif
 389                 dup2(s, 0);
 390                 dup2(s, 1);
 391                 dup2(s, 2);
 392                 for (s = getdtablesize() - 1; s >= 3; s--)
 393                    close(s);
 394
 395                 i = 0;
 396                 bptr = strdup(ex); /* No need to free() this */
 397                 if (do_pty == 1) {
 398                         /* Setup "slirp.telnetd -x" */
 399                         argv[i++] = "slirp.telnetd";
 400                         argv[i++] = "-x";
 401                         argv[i++] = bptr;
 402                 } else
 403                    do {
 404                         /* Change the string into argv[] */
 405                         curarg = bptr;
 406                         while (*bptr != ' ' && *bptr != (char)0)
 407                            bptr++;
 408                         c = *bptr;
 409                         *bptr++ = (char)0;
 410                         argv[i++] = strdup(curarg);
 411                    } while (c);
 412
 413                 argv[i] = 0;
 414                 execvp(argv[0], argv);
 415
 416                 /* Ooops, failed, let's tell the user why */
 417                   {
 418                           char buff[256];
 419
 420                           snprintf(buff, sizeof(buff),
 421                                    "Error: execvp of %s failed: %s\n",
 422                                    argv[0], strerror(errno));
 423                           write(2, buff, strlen(buff)+1);
 424                   }
 425                 close(0); close(1); close(2); /* XXX */
 426                 exit(1);
 427
 428          default:
 429                 if (do_pty == 2) {
 430                         close(s);
 431                         so->s = master;
 432                 } else {
 433                         /*
 434                          * XXX this could block us...
 435                          * XXX Should set a timer here, and if accept() doesn't
 436                          * return after X seconds, declare it a failure
 437                          * The only reason this will block forever is if socket()
 438                          * of connect() fail in the child process
 439                          */
 440                         do {
 441                             so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
 442                         } while (so->s < 0 && errno == EINTR);
 443                         closesocket(s);
 444                         opt = 1;
 445                         setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
 446                         opt = 1;
 447                         setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
 448                 }
 449                 fd_nonblock(so->s);
 450
 451                 /* Append the telnet options now */
 452                 if (so->so_m != 0 && do_pty == 1)  {
 453                         sbappend(so, so->so_m);
 454                         so->so_m = 0;
 455                 }
 456
 457                 return 1;
 458         }
 459 }
 460 #endif
 461
 462 #ifndef HAVE_STRDUP
 463 char *
 464 strdup(str)
 465         const char *str;
 466 {
 467         char *bptr;
 468
 469         bptr = (char *)malloc(strlen(str)+1);
 470         strcpy(bptr, str);
 471
 472         return bptr;
 473 }
 474 #endif
 475
 476 #if 0
 477 void
 478 snooze_hup(num)
 479         int num;
 480 {
 481         int s, ret;
 482 #ifndef NO_UNIX_SOCKETS
 483         struct sockaddr_un sock_un;
 484 #endif
 485         struct sockaddr_in sock_in;
 486         char buff[256];
 487
 488         ret = -1;
 489         if (slirp_socket_passwd) {
 490                 s = socket(AF_INET, SOCK_STREAM, 0);
 491                 if (s < 0)
 492                    slirp_exit(1);
 493                 sock_in.sin_family = AF_INET;
 494                 sock_in.sin_addr.s_addr = slirp_socket_addr;
 495                 sock_in.sin_port = htons(slirp_socket_port);
 496                 if (connect(s, (struct sockaddr *)&sock_in, sizeof(sock_in)) != 0)
 497                    slirp_exit(1); /* just exit...*/
 498                 sprintf(buff, "kill %s:%d", slirp_socket_passwd, slirp_socket_unit);
 499                 write(s, buff, strlen(buff)+1);
 500         }
 501 #ifndef NO_UNIX_SOCKETS
 502           else {
 503                 s = socket(AF_UNIX, SOCK_STREAM, 0);
 504                 if (s < 0)
 505                    slirp_exit(1);
 506                 sock_un.sun_family = AF_UNIX;
 507                 strcpy(sock_un.sun_path, socket_path);
 508                 if (connect(s, (struct sockaddr *)&sock_un,
 509                               sizeof(sock_un.sun_family) + sizeof(sock_un.sun_path)) != 0)
 510                    slirp_exit(1);
 511                 sprintf(buff, "kill none:%d", slirp_socket_unit);
 512                 write(s, buff, strlen(buff)+1);
 513         }
 514 #endif
 515         slirp_exit(0);
 516 }
 517
 518
 519 void
 520 snooze()
 521 {
 522         sigset_t s;
 523         int i;
 524
 525         /* Don't need our data anymore */
 526         /* XXX This makes SunOS barf */
 527 /*      brk(0); */
 528
 529         /* Close all fd's */
 530         for (i = 255; i >= 0; i--)
 531            close(i);
 532
 533         signal(SIGQUIT, slirp_exit);
 534         signal(SIGHUP, snooze_hup);
 535         sigemptyset(&s);
 536
 537         /* Wait for any signal */
 538         sigsuspend(&s);
 539
 540         /* Just in case ... */
 541         exit(255);
 542 }
 543
 544 void
 545 relay(s)
 546         int s;
 547 {
 548         char buf[8192];
 549         int n;
 550         fd_set readfds;
 551         struct ttys *ttyp;
 552
 553         /* Don't need our data anymore */
 554         /* XXX This makes SunOS barf */
 555 /*      brk(0); */
 556
 557         signal(SIGQUIT, slirp_exit);
 558         signal(SIGHUP, slirp_exit);
 559         signal(SIGINT, slirp_exit);
 560         signal(SIGTERM, slirp_exit);
 561
 562         /* Fudge to get term_raw and term_restore to work */
 563         if (NULL == (ttyp = tty_attach (0, slirp_tty))) {
 564          lprint ("Error: tty_attach failed in misc.c:relay()\r\n");
 565          slirp_exit (1);
 566     }
 567         ttyp->fd = 0;
 568         ttyp->flags |= TTY_CTTY;
 569         term_raw(ttyp);
 570
 571         while (1) {
 572                 FD_ZERO(&readfds);
 573
 574                 FD_SET(0, &readfds);
 575                 FD_SET(s, &readfds);
 576
 577                 n = select(s+1, &readfds, (fd_set *)0, (fd_set *)0, (struct timeval *)0);
 578
 579                 if (n <= 0)
 580                    slirp_exit(0);
 581
 582                 if (FD_ISSET(0, &readfds)) {
 583                         n = read(0, buf, 8192);
 584                         if (n <= 0)
 585                            slirp_exit(0);
 586                         n = writen(s, buf, n);
 587                         if (n <= 0)
 588                            slirp_exit(0);
 589                 }
 590
 591                 if (FD_ISSET(s, &readfds)) {
 592                         n = read(s, buf, 8192);
 593                         if (n <= 0)
 594                            slirp_exit(0);
 595                         n = writen(0, buf, n);
 596                         if (n <= 0)
 597                            slirp_exit(0);
 598                 }
 599         }
 600
 601         /* Just in case.... */
 602         exit(1);
 603 }
 604 #endif
 605
 606 #ifdef CONFIG_QEMU
 607 extern void term_vprintf(const char *fmt, va_list ap);
 608
 609 void lprint(const char *format, ...)
 610 {
 611     va_list args;
 612
 613     va_start(args, format);
 614     term_vprintf(format, args);
 615     va_end(args);
 616 }
 617 #else
 618 int (*lprint_print) _P((void *, const char *, va_list));
 619 char *lprint_ptr, *lprint_ptr2, **lprint_arg;
 620
 621 void
 622 #ifdef __STDC__
 623 lprint(const char *format, ...)
 624 #else
 625 lprint(va_alist) va_dcl
 626 #endif
 627 {
 628         va_list args;
 629
 630 #ifdef __STDC__
 631         va_start(args, format);
 632 #else
 633         char *format;
 634         va_start(args);
 635         format = va_arg(args, char *);
 636 #endif
 637 #if 0
 638         /* If we're printing to an sbuf, make sure there's enough room */
 639         /* XXX +100? */
 640         if (lprint_sb) {
 641                 if ((lprint_ptr - lprint_sb->sb_wptr) >=
 642                     (lprint_sb->sb_datalen - (strlen(format) + 100))) {
 643                         int deltaw = lprint_sb->sb_wptr - lprint_sb->sb_data;
 644                         int deltar = lprint_sb->sb_rptr - lprint_sb->sb_data;
 645                         int deltap = lprint_ptr -         lprint_sb->sb_data;
 646
 647                         lprint_sb->sb_data = (char *)realloc(lprint_sb->sb_data,
 648                                                              lprint_sb->sb_datalen + TCP_SNDSPACE);
 649
 650                         /* Adjust all values */
 651                         lprint_sb->sb_wptr = lprint_sb->sb_data + deltaw;
 652                         lprint_sb->sb_rptr = lprint_sb->sb_data + deltar;
 653                         lprint_ptr =         lprint_sb->sb_data + deltap;
 654
 655                         lprint_sb->sb_datalen += TCP_SNDSPACE;
 656                 }
 657         }
 658 #endif
 659         if (lprint_print)
 660            lprint_ptr += (*lprint_print)(*lprint_arg, format, args);
 661
 662         /* Check if they want output to be logged to file as well */
 663         if (lfd) {
 664                 /*
 665                  * Remove \r's
 666                  * otherwise you'll get ^M all over the file
 667                  */
 668                 int len = strlen(format);
 669                 char *bptr1, *bptr2;
 670
 671                 bptr1 = bptr2 = strdup(format);
 672
 673                 while (len--) {
 674                         if (*bptr1 == '\r')
 675                            memcpy(bptr1, bptr1+1, len+1);
 676                         else
 677                            bptr1++;
 678                 }
 679                 vfprintf(lfd, bptr2, args);
 680                 free(bptr2);
 681         }
 682         va_end(args);
 683 }
 684
 685 void
 686 add_emu(buff)
 687         char *buff;
 688 {
 689         u_int lport, fport;
 690         u_int8_t tos = 0, emu = 0;
 691         char buff1[256], buff2[256], buff4[128];
 692         char *buff3 = buff4;
 693         struct emu_t *emup;
 694         struct socket *so;
 695
 696         if (sscanf(buff, "%256s %256s", buff2, buff1) != 2) {
 697                 lprint("Error: Bad arguments\r\n");
 698                 return;
 699         }
 700
 701         if (sscanf(buff1, "%d:%d", &lport, &fport) != 2) {
 702                 lport = 0;
 703                 if (sscanf(buff1, "%d", &fport) != 1) {
 704                         lprint("Error: Bad first argument\r\n");
 705                         return;
 706                 }
 707         }
 708
 709         if (sscanf(buff2, "%128[^:]:%128s", buff1, buff3) != 2) {
 710                 buff3 = 0;
 711                 if (sscanf(buff2, "%256s", buff1) != 1) {
 712                         lprint("Error: Bad second argument\r\n");
 713                         return;
 714                 }
 715         }
 716
 717         if (buff3) {
 718                 if (strcmp(buff3, "lowdelay") == 0)
 719                    tos = IPTOS_LOWDELAY;
 720                 else if (strcmp(buff3, "throughput") == 0)
 721                    tos = IPTOS_THROUGHPUT;
 722                 else {
 723                         lprint("Error: Expecting \"lowdelay\"/\"throughput\"\r\n");
 724                         return;
 725                 }
 726         }
 727
 728         if (strcmp(buff1, "ftp") == 0)
 729            emu = EMU_FTP;
 730         else if (strcmp(buff1, "irc") == 0)
 731            emu = EMU_IRC;
 732         else if (strcmp(buff1, "none") == 0)
 733            emu = EMU_NONE; /* ie: no emulation */
 734         else {
 735                 lprint("Error: Unknown service\r\n");
 736                 return;
 737         }
 738
 739         /* First, check that it isn't already emulated */
 740         for (emup = tcpemu; emup; emup = emup->next) {
 741                 if (emup->lport == lport && emup->fport == fport) {
 742                         lprint("Error: port already emulated\r\n");
 743                         return;
 744                 }
 745         }
 746
 747         /* link it */
 748         emup = (struct emu_t *)malloc(sizeof (struct emu_t));
 749         emup->lport = (u_int16_t)lport;
 750         emup->fport = (u_int16_t)fport;
 751         emup->tos = tos;
 752         emup->emu = emu;
 753         emup->next = tcpemu;
 754         tcpemu = emup;
 755
 756         /* And finally, mark all current sessions, if any, as being emulated */
 757         for (so = tcb.so_next; so != &tcb; so = so->so_next) {
 758                 if ((lport && lport == ntohs(so->so_lport)) ||
 759                     (fport && fport == ntohs(so->so_fport))) {
 760                         if (emu)
 761                            so->so_emu = emu;
 762                         if (tos)
 763                            so->so_iptos = tos;
 764                 }
 765         }
 766
 767         lprint("Adding emulation for %s to port %d/%d\r\n", buff1, emup->lport, emup->fport);
 768 }
 769 #endif
 770
 771 #ifdef BAD_SPRINTF
 772
 773 #undef vsprintf
 774 #undef sprintf
 775
 776 /*
 777  * Some BSD-derived systems have a sprintf which returns char *
 778  */
 779
 780 int
 781 vsprintf_len(string, format, args)
 782         char *string;
 783         const char *format;
 784         va_list args;
 785 {
 786         vsprintf(string, format, args);
 787         return strlen(string);
 788 }
 789
 790 int
 791 #ifdef __STDC__
 792 sprintf_len(char *string, const char *format, ...)
 793 #else
 794 sprintf_len(va_alist) va_dcl
 795 #endif
 796 {
 797         va_list args;
 798 #ifdef __STDC__
 799         va_start(args, format);
 800 #else
 801         char *string;
 802         char *format;
 803         va_start(args);
 804         string = va_arg(args, char *);
 805         format = va_arg(args, char *);
 806 #endif
 807         vsprintf(string, format, args);
 808         return strlen(string);
 809 }
 810
 811 #endif
 812
 813 void
 814 u_sleep(usec)
 815         int usec;
 816 {
 817         struct timeval t;
 818         fd_set fdset;
 819
 820         FD_ZERO(&fdset);
 821
 822         t.tv_sec = 0;
 823         t.tv_usec = usec * 1000;
 824
 825         select(0, &fdset, &fdset, &fdset, &t);
 826 }
 827
 828 /*
 829  * Set fd blocking and non-blocking
 830  */
 831
 832 void
 833 fd_nonblock(fd)
 834         int fd;
 835 {
 836 #ifdef FIONBIO
 837         int opt = 1;
 838
 839         ioctlsocket(fd, FIONBIO, &opt);
 840 #else
 841         int opt;
 842
 843         opt = fcntl(fd, F_GETFL, 0);
 844         opt |= O_NONBLOCK;
 845         fcntl(fd, F_SETFL, opt);
 846 #endif
 847 }
 848
 849 void
 850 fd_block(fd)
 851         int fd;
 852 {
 853 #ifdef FIONBIO
 854         int opt = 0;
 855
 856         ioctlsocket(fd, FIONBIO, &opt);
 857 #else
 858         int opt;
 859
 860         opt = fcntl(fd, F_GETFL, 0);
 861         opt &= ~O_NONBLOCK;
 862         fcntl(fd, F_SETFL, opt);
 863 #endif
 864 }
 865
 866
 867 #if 0
 868 /*
 869  * invoke RSH
 870  */
 871 int
 872 rsh_exec(so,ns, user, host, args)
 873         struct socket *so;
 874         struct socket *ns;
 875         char *user;
 876         char *host;
 877         char *args;
 878 {
 879         int fd[2];
 880         int fd0[2];
 881         int s;
 882         char buff[256];
 883
 884         DEBUG_CALL("rsh_exec");
 885         DEBUG_ARG("so = %lx", (long)so);
 886
 887         if (pipe(fd)<0) {
 888           lprint("Error: pipe failed: %s\n", strerror(errno));
 889           return 0;
 890         }
 891 /* #ifdef HAVE_SOCKETPAIR */
 892 #if 1
 893         if (socketpair(PF_UNIX,SOCK_STREAM,0, fd0) == -1) {
 894           close(fd[0]);
 895           close(fd[1]);
 896           lprint("Error: openpty failed: %s\n", strerror(errno));
 897           return 0;
 898         }
 899 #else
 900         if (slirp_openpty(&fd0[0], &fd0[1]) == -1) {
 901           close(fd[0]);
 902           close(fd[1]);
 903           lprint("Error: openpty failed: %s\n", strerror(errno));
 904           return 0;
 905         }
 906 #endif
 907
 908         switch(fork()) {
 909          case -1:
 910            lprint("Error: fork failed: %s\n", strerror(errno));
 911            close(fd[0]);
 912            close(fd[1]);
 913            close(fd0[0]);
 914            close(fd0[1]);
 915            return 0;
 916
 917          case 0:
 918            close(fd[0]);
 919            close(fd0[0]);
 920
 921                 /* Set the DISPLAY */
 922            if (x_port >= 0) {
 923 #ifdef HAVE_SETENV
 924              sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
 925              setenv("DISPLAY", buff, 1);
 926 #else
 927              sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
 928              putenv(buff);
 929 #endif
 930            }
 931
 932            dup2(fd0[1], 0);
 933            dup2(fd0[1], 1);
 934            dup2(fd[1], 2);
 935            for (s = 3; s <= 255; s++)
 936              close(s);
 937
 938            execlp("rsh","rsh","-l", user, host, args, NULL);
 939
 940            /* Ooops, failed, let's tell the user why */
 941
 942            sprintf(buff, "Error: execlp of %s failed: %s\n",
 943                    "rsh", strerror(errno));
 944            write(2, buff, strlen(buff)+1);
 945            close(0); close(1); close(2); /* XXX */
 946            exit(1);
 947
 948         default:
 949           close(fd[1]);
 950           close(fd0[1]);
 951           ns->s=fd[0];
 952           so->s=fd0[0];
 953
 954           return 1;
 955         }
 956 }
 957 #endif