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, detach_time;
  12 u_int detach_wait = 600000;     /* 10 minutes */
  13
  14 #if 0
  15 int x_port = -1;
  16 int x_display = 0;
  17 int x_screen = 0;
  18
  19 int
  20 show_x(buff, inso)
  21         char *buff;
  22         struct socket *inso;
  23 {
  24         if (x_port < 0) {
  25                 lprint("X Redir: X not being redirected.\r\n");
  26         } else {
  27                 lprint("X Redir: In sh/bash/zsh/etc. type: DISPLAY=%s:%d.%d; export DISPLAY\r\n",
  28                       inet_ntoa(our_addr), x_port, x_screen);
  29                 lprint("X Redir: In csh/tcsh/etc. type:    setenv DISPLAY %s:%d.%d\r\n",
  30                       inet_ntoa(our_addr), x_port, x_screen);
  31                 if (x_display)
  32                    lprint("X Redir: Redirecting to display %d\r\n", x_display);
  33         }
  34
  35         return CFG_OK;
  36 }
  37
  38
  39 /*
  40  * XXX Allow more than one X redirection?
  41  */
  42 void
  43 redir_x(inaddr, start_port, display, screen)
  44         u_int32_t inaddr;
  45         int start_port;
  46         int display;
  47         int screen;
  48 {
  49         int i;
  50
  51         if (x_port >= 0) {
  52                 lprint("X Redir: X already being redirected.\r\n");
  53                 show_x(0, 0);
  54         } else {
  55                 for (i = 6001 + (start_port-1); i <= 6100; i++) {
  56                         if (solisten(htons(i), inaddr, htons(6000 + display), 0)) {
  57                                 /* Success */
  58                                 x_port = i - 6000;
  59                                 x_display = display;
  60                                 x_screen = screen;
  61                                 show_x(0, 0);
  62                                 return;
  63                         }
  64                 }
  65                 lprint("X Redir: Error: Couldn't redirect a port for X. Weird.\r\n");
  66         }
  67 }
  68 #endif
  69
  70 #ifndef HAVE_INET_ATON
  71 int
  72 inet_aton(cp, ia)
  73         const char *cp;
  74         struct in_addr *ia;
  75 {
  76         u_int32_t addr = inet_addr(cp);
  77         if (addr == 0xffffffff)
  78                 return 0;
  79         ia->s_addr = addr;
  80         return 1;
  81 }
  82 #endif
  83
  84 /*
  85  * Get our IP address and put it in our_addr
  86  */
  87 void
  88 getouraddr()
  89 {
  90         char buff[256];
  91         struct hostent *he = NULL;
  92
  93         if (gethostname(buff,256) == 0)
  94             he = gethostbyname(buff);
  95         if (he)
  96             our_addr = *(struct in_addr *)he->h_addr;
  97         /* If the host doesn't have a useful IP address then use the
  98            guest side address.  */
  99         if (our_addr.s_addr == 0 || our_addr.s_addr == loopback_addr.s_addr)
 100             our_addr.s_addr = special_addr.s_addr | htonl(CTL_ALIAS);
 101 }
 102
 103 #if SIZEOF_CHAR_P == 8
 104
 105 struct quehead_32 {
 106         u_int32_t qh_link;
 107         u_int32_t qh_rlink;
 108 };
 109
 110 inline void
 111 insque_32(a, b)
 112         void *a;
 113         void *b;
 114 {
 115         register struct quehead_32 *element = (struct quehead_32 *) a;
 116         register struct quehead_32 *head = (struct quehead_32 *) b;
 117         element->qh_link = head->qh_link;
 118         head->qh_link = (u_int32_t)element;
 119         element->qh_rlink = (u_int32_t)head;
 120         ((struct quehead_32 *)(element->qh_link))->qh_rlink
 121         = (u_int32_t)element;
 122 }
 123
 124 inline void
 125 remque_32(a)
 126         void *a;
 127 {
 128         register struct quehead_32 *element = (struct quehead_32 *) a;
 129         ((struct quehead_32 *)(element->qh_link))->qh_rlink = element->qh_rlink;
 130         ((struct quehead_32 *)(element->qh_rlink))->qh_link = element->qh_link;
 131         element->qh_rlink = 0;
 132 }
 133
 134 #endif /* SIZEOF_CHAR_P == 8 */
 135
 136 struct quehead {
 137         struct quehead *qh_link;
 138         struct quehead *qh_rlink;
 139 };
 140
 141 inline void
 142 insque(a, b)
 143         void *a, *b;
 144 {
 145         register struct quehead *element = (struct quehead *) a;
 146         register struct quehead *head = (struct quehead *) b;
 147         element->qh_link = head->qh_link;
 148         head->qh_link = (struct quehead *)element;
 149         element->qh_rlink = (struct quehead *)head;
 150         ((struct quehead *)(element->qh_link))->qh_rlink
 151         = (struct quehead *)element;
 152 }
 153
 154 inline void
 155 remque(a)
 156      void *a;
 157 {
 158   register struct quehead *element = (struct quehead *) a;
 159   ((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
 160   ((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
 161   element->qh_rlink = NULL;
 162   /*  element->qh_link = NULL;  TCP FIN1 crashes if you do this.  Why ? */
 163 }
 164
 165 /* #endif */
 166
 167
 168 int
 169 add_exec(ex_ptr, do_pty, exec, addr, port)
 170         struct ex_list **ex_ptr;
 171         int do_pty;
 172         char *exec;
 173         int addr;
 174         int port;
 175 {
 176         struct ex_list *tmp_ptr;
 177
 178         /* First, check if the port is "bound" */
 179         for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
 180                 if (port == tmp_ptr->ex_fport && addr == tmp_ptr->ex_addr)
 181                    return -1;
 182         }
 183
 184         tmp_ptr = *ex_ptr;
 185         *ex_ptr = (struct ex_list *)malloc(sizeof(struct ex_list));
 186         (*ex_ptr)->ex_fport = port;
 187         (*ex_ptr)->ex_addr = addr;
 188         (*ex_ptr)->ex_pty = do_pty;
 189         (*ex_ptr)->ex_exec = strdup(exec);
 190         (*ex_ptr)->ex_next = tmp_ptr;
 191         return 0;
 192 }
 193
 194 #ifndef HAVE_STRERROR
 195
 196 /*
 197  * For systems with no strerror
 198  */
 199
 200 extern int sys_nerr;
 201 extern char *sys_errlist[];
 202
 203 char *
 204 strerror(error)
 205         int error;
 206 {
 207         if (error < sys_nerr)
 208            return sys_errlist[error];
 209         else
 210            return "Unknown error.";
 211 }
 212
 213 #endif
 214
 215
 216 #ifdef _WIN32
 217
 218 int
 219 fork_exec(so, ex, do_pty)
 220         struct socket *so;
 221         char *ex;
 222         int do_pty;
 223 {
 224     /* not implemented */
 225     return 0;
 226 }
 227
 228 #else
 229
 230 int
 231 slirp_openpty(amaster, aslave)
 232      int *amaster, *aslave;
 233 {
 234         register int master, slave;
 235
 236 #ifdef HAVE_GRANTPT
 237         char *ptr;
 238
 239         if ((master = open("/dev/ptmx", O_RDWR)) < 0 ||
 240             grantpt(master) < 0 ||
 241             unlockpt(master) < 0 ||
 242             (ptr = ptsname(master)) == NULL)  {
 243                 close(master);
 244                 return -1;
 245         }
 246
 247         if ((slave = open(ptr, O_RDWR)) < 0 ||
 248             ioctl(slave, I_PUSH, "ptem") < 0 ||
 249             ioctl(slave, I_PUSH, "ldterm") < 0 ||
 250             ioctl(slave, I_PUSH, "ttcompat") < 0) {
 251                 close(master);
 252                 close(slave);
 253                 return -1;
 254         }
 255
 256         *amaster = master;
 257         *aslave = slave;
 258         return 0;
 259
 260 #else
 261
 262         static char line[] = "/dev/ptyXX";
 263         register const char *cp1, *cp2;
 264
 265         for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
 266                 line[8] = *cp1;
 267                 for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
 268                         line[9] = *cp2;
 269                         if ((master = open(line, O_RDWR, 0)) == -1) {
 270                                 if (errno == ENOENT)
 271                                    return (-1);    /* out of ptys */
 272                         } else {
 273                                 line[5] = 't';
 274                                 /* These will fail */
 275                                 (void) chown(line, getuid(), 0);
 276                                 (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
 277 #ifdef HAVE_REVOKE
 278                                 (void) revoke(line);
 279 #endif
 280                                 if ((slave = open(line, O_RDWR, 0)) != -1) {
 281                                         *amaster = master;
 282                                         *aslave = slave;
 283                                         return 0;
 284                                 }
 285                                 (void) close(master);
 286                                 line[5] = 'p';
 287                         }
 288                 }
 289         }
 290         errno = ENOENT; /* out of ptys */
 291         return (-1);
 292 #endif
 293 }
 294
 295 /*
 296  * XXX This is ugly
 297  * We create and bind a socket, then fork off to another
 298  * process, which connects to this socket, after which we
 299  * exec the wanted program.  If something (strange) happens,
 300  * the accept() call could block us forever.
 301  *
 302  * do_pty = 0   Fork/exec inetd style
 303  * do_pty = 1   Fork/exec using slirp.telnetd
 304  * do_ptr = 2   Fork/exec using pty
 305  */
 306 int
 307 fork_exec(so, ex, do_pty)
 308         struct socket *so;
 309         char *ex;
 310         int do_pty;
 311 {
 312         int s;
 313         struct sockaddr_in addr;
 314         int addrlen = sizeof(addr);
 315         int opt;
 316         int master;
 317         char *argv[256];
 318 #if 0
 319         char buff[256];
 320 #endif
 321         /* don't want to clobber the original */
 322         char *bptr;
 323         char *curarg;
 324         int c, i, ret;
 325
 326         DEBUG_CALL("fork_exec");
 327         DEBUG_ARG("so = %lx", (long)so);
 328         DEBUG_ARG("ex = %lx", (long)ex);
 329         DEBUG_ARG("do_pty = %lx", (long)do_pty);
 330
 331         if (do_pty == 2) {
 332                 if (slirp_openpty(&master, &s) == -1) {
 333                         lprint("Error: openpty failed: %s\n", strerror(errno));
 334                         return 0;
 335                 }
 336         } else {
 337                 addr.sin_family = AF_INET;
 338                 addr.sin_port = 0;
 339                 addr.sin_addr.s_addr = INADDR_ANY;
 340
 341                 if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
 342                     bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
 343                     listen(s, 1) < 0) {
 344                         lprint("Error: inet socket: %s\n", strerror(errno));
 345                         closesocket(s);
 346
 347                         return 0;
 348                 }
 349         }
 350
 351         switch(fork()) {
 352          case -1:
 353                 lprint("Error: fork failed: %s\n", strerror(errno));
 354                 close(s);
 355                 if (do_pty == 2)
 356                    close(master);
 357                 return 0;
 358
 359          case 0:
 360                 /* Set the DISPLAY */
 361                 if (do_pty == 2) {
 362                         (void) close(master);
 363 #ifdef TIOCSCTTY /* XXXXX */
 364                         (void) setsid();
 365                         ioctl(s, TIOCSCTTY, (char *)NULL);
 366 #endif
 367                 } else {
 368                         getsockname(s, (struct sockaddr *)&addr, &addrlen);
 369                         close(s);
 370                         /*
 371                          * Connect to the socket
 372                          * XXX If any of these fail, we're in trouble!
 373                          */
 374                         s = socket(AF_INET, SOCK_STREAM, 0);
 375                         addr.sin_addr = loopback_addr;
 376                         do {
 377                             ret = connect(s, (struct sockaddr *)&addr, addrlen);
 378                         } while (ret < 0 && errno == EINTR);
 379                 }
 380
 381 #if 0
 382                 if (x_port >= 0) {
 383 #ifdef HAVE_SETENV
 384                         sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
 385                         setenv("DISPLAY", buff, 1);
 386 #else
 387                         sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
 388                         putenv(buff);
 389 #endif
 390                 }
 391 #endif
 392                 dup2(s, 0);
 393                 dup2(s, 1);
 394                 dup2(s, 2);
 395                 for (s = 3; s <= 255; s++)
 396                    close(s);
 397
 398                 i = 0;
 399                 bptr = strdup(ex); /* No need to free() this */
 400                 if (do_pty == 1) {
 401                         /* Setup "slirp.telnetd -x" */
 402                         argv[i++] = "slirp.telnetd";
 403                         argv[i++] = "-x";
 404                         argv[i++] = bptr;
 405                 } else
 406                    do {
 407                         /* Change the string into argv[] */
 408                         curarg = bptr;
 409                         while (*bptr != ' ' && *bptr != (char)0)
 410                            bptr++;
 411                         c = *bptr;
 412                         *bptr++ = (char)0;
 413                         argv[i++] = strdup(curarg);
 414                    } while (c);
 415
 416                 argv[i] = 0;
 417                 execvp(argv[0], argv);
 418
 419                 /* Ooops, failed, let's tell the user why */
 420                   {
 421                           char buff[256];
 422
 423                           sprintf(buff, "Error: execvp of %s failed: %s\n",
 424                                   argv[0], strerror(errno));
 425                           write(2, buff, strlen(buff)+1);
 426                   }
 427                 close(0); close(1); close(2); /* XXX */
 428                 exit(1);
 429
 430          default:
 431                 if (do_pty == 2) {
 432                         close(s);
 433                         so->s = master;
 434                 } else {
 435                         /*
 436                          * XXX this could block us...
 437                          * XXX Should set a timer here, and if accept() doesn't
 438                          * return after X seconds, declare it a failure
 439                          * The only reason this will block forever is if socket()
 440                          * of connect() fail in the child process
 441                          */
 442                         do {
 443                             so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
 444                         } while (so->s < 0 && errno == EINTR);
 445                         closesocket(s);
 446                         opt = 1;
 447                         setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
 448                         opt = 1;
 449                         setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
 450                 }
 451                 fd_nonblock(so->s);
 452
 453                 /* Append the telnet options now */
 454                 if (so->so_m != 0 && do_pty == 1)  {
 455                         sbappend(so, so->so_m);
 456                         so->so_m = 0;
 457                 }
 458
 459                 return 1;
 460         }
 461 }
 462 #endif
 463
 464 #ifndef HAVE_STRDUP
 465 char *
 466 strdup(str)
 467         const char *str;
 468 {
 469         char *bptr;
 470
 471         bptr = (char *)malloc(strlen(str)+1);
 472         strcpy(bptr, str);
 473
 474         return bptr;
 475 }
 476 #endif
 477
 478 #if 0
 479 void
 480 snooze_hup(num)
 481         int num;
 482 {
 483         int s, ret;
 484 #ifndef NO_UNIX_SOCKETS
 485         struct sockaddr_un sock_un;
 486 #endif
 487         struct sockaddr_in sock_in;
 488         char buff[256];
 489
 490         ret = -1;
 491         if (slirp_socket_passwd) {
 492                 s = socket(AF_INET, SOCK_STREAM, 0);
 493                 if (s < 0)
 494                    slirp_exit(1);
 495                 sock_in.sin_family = AF_INET;
 496                 sock_in.sin_addr.s_addr = slirp_socket_addr;
 497                 sock_in.sin_port = htons(slirp_socket_port);
 498                 if (connect(s, (struct sockaddr *)&sock_in, sizeof(sock_in)) != 0)
 499                    slirp_exit(1); /* just exit...*/
 500                 sprintf(buff, "kill %s:%d", slirp_socket_passwd, slirp_socket_unit);
 501                 write(s, buff, strlen(buff)+1);
 502         }
 503 #ifndef NO_UNIX_SOCKETS
 504           else {
 505                 s = socket(AF_UNIX, SOCK_STREAM, 0);
 506                 if (s < 0)
 507                    slirp_exit(1);
 508                 sock_un.sun_family = AF_UNIX;
 509                 strcpy(sock_un.sun_path, socket_path);
 510                 if (connect(s, (struct sockaddr *)&sock_un,
 511                               sizeof(sock_un.sun_family) + sizeof(sock_un.sun_path)) != 0)
 512                    slirp_exit(1);
 513                 sprintf(buff, "kill none:%d", slirp_socket_unit);
 514                 write(s, buff, strlen(buff)+1);
 515         }
 516 #endif
 517         slirp_exit(0);
 518 }
 519
 520
 521 void
 522 snooze()
 523 {
 524         sigset_t s;
 525         int i;
 526
 527         /* Don't need our data anymore */
 528         /* XXX This makes SunOS barf */
 529 /*      brk(0); */
 530
 531         /* Close all fd's */
 532         for (i = 255; i >= 0; i--)
 533            close(i);
 534
 535         signal(SIGQUIT, slirp_exit);
 536         signal(SIGHUP, snooze_hup);
 537         sigemptyset(&s);
 538
 539         /* Wait for any signal */
 540         sigsuspend(&s);
 541
 542         /* Just in case ... */
 543         exit(255);
 544 }
 545
 546 void
 547 relay(s)
 548         int s;
 549 {
 550         char buf[8192];
 551         int n;
 552         fd_set readfds;
 553         struct ttys *ttyp;
 554
 555         /* Don't need our data anymore */
 556         /* XXX This makes SunOS barf */
 557 /*      brk(0); */
 558
 559         signal(SIGQUIT, slirp_exit);
 560         signal(SIGHUP, slirp_exit);
 561         signal(SIGINT, slirp_exit);
 562         signal(SIGTERM, slirp_exit);
 563
 564         /* Fudge to get term_raw and term_restore to work */
 565         if (NULL == (ttyp = tty_attach (0, slirp_tty))) {
 566          lprint ("Error: tty_attach failed in misc.c:relay()\r\n");
 567          slirp_exit (1);
 568     }
 569         ttyp->fd = 0;
 570         ttyp->flags |= TTY_CTTY;
 571         term_raw(ttyp);
 572
 573         while (1) {
 574                 FD_ZERO(&readfds);
 575
 576                 FD_SET(0, &readfds);
 577                 FD_SET(s, &readfds);
 578
 579                 n = select(s+1, &readfds, (fd_set *)0, (fd_set *)0, (struct timeval *)0);
 580
 581                 if (n <= 0)
 582                    slirp_exit(0);
 583
 584                 if (FD_ISSET(0, &readfds)) {
 585                         n = read(0, buf, 8192);
 586                         if (n <= 0)
 587                            slirp_exit(0);
 588                         n = writen(s, buf, n);
 589                         if (n <= 0)
 590                            slirp_exit(0);
 591                 }
 592
 593                 if (FD_ISSET(s, &readfds)) {
 594                         n = read(s, buf, 8192);
 595                         if (n <= 0)
 596                            slirp_exit(0);
 597                         n = writen(0, buf, n);
 598                         if (n <= 0)
 599                            slirp_exit(0);
 600                 }
 601         }
 602
 603         /* Just in case.... */
 604         exit(1);
 605 }
 606 #endif
 607
 608 int (*lprint_print) _P((void *, const char *, va_list));
 609 char *lprint_ptr, *lprint_ptr2, **lprint_arg;
 610
 611 void
 612 #ifdef __STDC__
 613 lprint(const char *format, ...)
 614 #else
 615 lprint(va_alist) va_dcl
 616 #endif
 617 {
 618         va_list args;
 619
 620 #ifdef __STDC__
 621         va_start(args, format);
 622 #else
 623         char *format;
 624         va_start(args);
 625         format = va_arg(args, char *);
 626 #endif
 627 #if 0
 628         /* If we're printing to an sbuf, make sure there's enough room */
 629         /* XXX +100? */
 630         if (lprint_sb) {
 631                 if ((lprint_ptr - lprint_sb->sb_wptr) >=
 632                     (lprint_sb->sb_datalen - (strlen(format) + 100))) {
 633                         int deltaw = lprint_sb->sb_wptr - lprint_sb->sb_data;
 634                         int deltar = lprint_sb->sb_rptr - lprint_sb->sb_data;
 635                         int deltap = lprint_ptr -         lprint_sb->sb_data;
 636
 637                         lprint_sb->sb_data = (char *)realloc(lprint_sb->sb_data,
 638                                                              lprint_sb->sb_datalen + TCP_SNDSPACE);
 639
 640                         /* Adjust all values */
 641                         lprint_sb->sb_wptr = lprint_sb->sb_data + deltaw;
 642                         lprint_sb->sb_rptr = lprint_sb->sb_data + deltar;
 643                         lprint_ptr =         lprint_sb->sb_data + deltap;
 644
 645                         lprint_sb->sb_datalen += TCP_SNDSPACE;
 646                 }
 647         }
 648 #endif
 649         if (lprint_print)
 650            lprint_ptr += (*lprint_print)(*lprint_arg, format, args);
 651
 652         /* Check if they want output to be logged to file as well */
 653         if (lfd) {
 654                 /*
 655                  * Remove \r's
 656                  * otherwise you'll get ^M all over the file
 657                  */
 658                 int len = strlen(format);
 659                 char *bptr1, *bptr2;
 660
 661                 bptr1 = bptr2 = strdup(format);
 662
 663                 while (len--) {
 664                         if (*bptr1 == '\r')
 665                            memcpy(bptr1, bptr1+1, len+1);
 666                         else
 667                            bptr1++;
 668                 }
 669                 vfprintf(lfd, bptr2, args);
 670                 free(bptr2);
 671         }
 672         va_end(args);
 673 }
 674
 675 void
 676 add_emu(buff)
 677         char *buff;
 678 {
 679         u_int lport, fport;
 680         u_int8_t tos = 0, emu = 0;
 681         char buff1[256], buff2[256], buff4[128];
 682         char *buff3 = buff4;
 683         struct emu_t *emup;
 684         struct socket *so;
 685
 686         if (sscanf(buff, "%256s %256s", buff2, buff1) != 2) {
 687                 lprint("Error: Bad arguments\r\n");
 688                 return;
 689         }
 690
 691         if (sscanf(buff1, "%d:%d", &lport, &fport) != 2) {
 692                 lport = 0;
 693                 if (sscanf(buff1, "%d", &fport) != 1) {
 694                         lprint("Error: Bad first argument\r\n");
 695                         return;
 696                 }
 697         }
 698
 699         if (sscanf(buff2, "%128[^:]:%128s", buff1, buff3) != 2) {
 700                 buff3 = 0;
 701                 if (sscanf(buff2, "%256s", buff1) != 1) {
 702                         lprint("Error: Bad second argument\r\n");
 703                         return;
 704                 }
 705         }
 706
 707         if (buff3) {
 708                 if (strcmp(buff3, "lowdelay") == 0)
 709                    tos = IPTOS_LOWDELAY;
 710                 else if (strcmp(buff3, "throughput") == 0)
 711                    tos = IPTOS_THROUGHPUT;
 712                 else {
 713                         lprint("Error: Expecting \"lowdelay\"/\"throughput\"\r\n");
 714                         return;
 715                 }
 716         }
 717
 718         if (strcmp(buff1, "ftp") == 0)
 719            emu = EMU_FTP;
 720         else if (strcmp(buff1, "irc") == 0)
 721            emu = EMU_IRC;
 722         else if (strcmp(buff1, "none") == 0)
 723            emu = EMU_NONE; /* ie: no emulation */
 724         else {
 725                 lprint("Error: Unknown service\r\n");
 726                 return;
 727         }
 728
 729         /* First, check that it isn't already emulated */
 730         for (emup = tcpemu; emup; emup = emup->next) {
 731                 if (emup->lport == lport && emup->fport == fport) {
 732                         lprint("Error: port already emulated\r\n");
 733                         return;
 734                 }
 735         }
 736
 737         /* link it */
 738         emup = (struct emu_t *)malloc(sizeof (struct emu_t));
 739         emup->lport = (u_int16_t)lport;
 740         emup->fport = (u_int16_t)fport;
 741         emup->tos = tos;
 742         emup->emu = emu;
 743         emup->next = tcpemu;
 744         tcpemu = emup;
 745
 746         /* And finally, mark all current sessions, if any, as being emulated */
 747         for (so = tcb.so_next; so != &tcb; so = so->so_next) {
 748                 if ((lport && lport == ntohs(so->so_lport)) ||
 749                     (fport && fport == ntohs(so->so_fport))) {
 750                         if (emu)
 751                            so->so_emu = emu;
 752                         if (tos)
 753                            so->so_iptos = tos;
 754                 }
 755         }
 756
 757         lprint("Adding emulation for %s to port %d/%d\r\n", buff1, emup->lport, emup->fport);
 758 }
 759
 760 #ifdef BAD_SPRINTF
 761
 762 #undef vsprintf
 763 #undef sprintf
 764
 765 /*
 766  * Some BSD-derived systems have a sprintf which returns char *
 767  */
 768
 769 int
 770 vsprintf_len(string, format, args)
 771         char *string;
 772         const char *format;
 773         va_list args;
 774 {
 775         vsprintf(string, format, args);
 776         return strlen(string);
 777 }
 778
 779 int
 780 #ifdef __STDC__
 781 sprintf_len(char *string, const char *format, ...)
 782 #else
 783 sprintf_len(va_alist) va_dcl
 784 #endif
 785 {
 786         va_list args;
 787 #ifdef __STDC__
 788         va_start(args, format);
 789 #else
 790         char *string;
 791         char *format;
 792         va_start(args);
 793         string = va_arg(args, char *);
 794         format = va_arg(args, char *);
 795 #endif
 796         vsprintf(string, format, args);
 797         return strlen(string);
 798 }
 799
 800 #endif
 801
 802 void
 803 u_sleep(usec)
 804         int usec;
 805 {
 806         struct timeval t;
 807         fd_set fdset;
 808
 809         FD_ZERO(&fdset);
 810
 811         t.tv_sec = 0;
 812         t.tv_usec = usec * 1000;
 813
 814         select(0, &fdset, &fdset, &fdset, &t);
 815 }
 816
 817 /*
 818  * Set fd blocking and non-blocking
 819  */
 820
 821 void
 822 fd_nonblock(fd)
 823         int fd;
 824 {
 825 #ifdef FIONBIO
 826         int opt = 1;
 827
 828         ioctlsocket(fd, FIONBIO, &opt);
 829 #else
 830         int opt;
 831
 832         opt = fcntl(fd, F_GETFL, 0);
 833         opt |= O_NONBLOCK;
 834         fcntl(fd, F_SETFL, opt);
 835 #endif
 836 }
 837
 838 void
 839 fd_block(fd)
 840         int fd;
 841 {
 842 #ifdef FIONBIO
 843         int opt = 0;
 844
 845         ioctlsocket(fd, FIONBIO, &opt);
 846 #else
 847         int opt;
 848
 849         opt = fcntl(fd, F_GETFL, 0);
 850         opt &= ~O_NONBLOCK;
 851         fcntl(fd, F_SETFL, opt);
 852 #endif
 853 }
 854
 855
 856 #if 0
 857 /*
 858  * invoke RSH
 859  */
 860 int
 861 rsh_exec(so,ns, user, host, args)
 862         struct socket *so;
 863         struct socket *ns;
 864         char *user;
 865         char *host;
 866         char *args;
 867 {
 868         int fd[2];
 869         int fd0[2];
 870         int s;
 871         char buff[256];
 872
 873         DEBUG_CALL("rsh_exec");
 874         DEBUG_ARG("so = %lx", (long)so);
 875
 876         if (pipe(fd)<0) {
 877           lprint("Error: pipe failed: %s\n", strerror(errno));
 878           return 0;
 879         }
 880 /* #ifdef HAVE_SOCKETPAIR */
 881 #if 1
 882         if (socketpair(PF_UNIX,SOCK_STREAM,0, fd0) == -1) {
 883           close(fd[0]);
 884           close(fd[1]);
 885           lprint("Error: openpty failed: %s\n", strerror(errno));
 886           return 0;
 887         }
 888 #else
 889         if (slirp_openpty(&fd0[0], &fd0[1]) == -1) {
 890           close(fd[0]);
 891           close(fd[1]);
 892           lprint("Error: openpty failed: %s\n", strerror(errno));
 893           return 0;
 894         }
 895 #endif
 896
 897         switch(fork()) {
 898          case -1:
 899            lprint("Error: fork failed: %s\n", strerror(errno));
 900            close(fd[0]);
 901            close(fd[1]);
 902            close(fd0[0]);
 903            close(fd0[1]);
 904            return 0;
 905
 906          case 0:
 907            close(fd[0]);
 908            close(fd0[0]);
 909
 910                 /* Set the DISPLAY */
 911            if (x_port >= 0) {
 912 #ifdef HAVE_SETENV
 913              sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
 914              setenv("DISPLAY", buff, 1);
 915 #else
 916              sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);
 917              putenv(buff);
 918 #endif
 919            }
 920
 921            dup2(fd0[1], 0);
 922            dup2(fd0[1], 1);
 923            dup2(fd[1], 2);
 924            for (s = 3; s <= 255; s++)
 925              close(s);
 926
 927            execlp("rsh","rsh","-l", user, host, args, NULL);
 928
 929            /* Ooops, failed, let's tell the user why */
 930
 931            sprintf(buff, "Error: execlp of %s failed: %s\n",
 932                    "rsh", strerror(errno));
 933            write(2, buff, strlen(buff)+1);
 934            close(0); close(1); close(2); /* XXX */
 935            exit(1);
 936
 937         default:
 938           close(fd[1]);
 939           close(fd0[1]);
 940           ns->s=fd[0];
 941           so->s=fd0[0];
 942
 943           return 1;
 944         }
 945 }
 946 #endif