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