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