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