2.11BSD#431 - /usr/src/libexec/tcpd/ncr.c

   1:  /*
   2:   * This part for NCR UNIX with is from Andrew Maffei (arm@aqua.whoi.edu). It
   3:   * assumes TLI throughout. In order to look up endpoint address information
   4:   * we must talk to the "timod" streams module. For some reason "timod" wants
   5:   * to sit directly on top of the device driver. Therefore we pop off all
   6:   * streams modules except the driver, install the "timod" module so that we
   7:   * can figure out network addresses, and then restore the original state.
   8:   */
   9: 
  10: #ifndef lint
  11: static char sccsid[] = "@(#) ncr.c 1.1 94/12/28 17:42:34";
  12: #endif
  13: 
  14: #include <sys/types.h>
  15: #include <stdio.h>
  16: #include <syslog.h>
  17: #include <sys/tiuser.h>
  18: #include <stropts.h>
  19: #include <sys/conf.h>
  20: 
  21: #include "tcpd.h"
  22: 
  23: #define MAX_MODULE_COUNT    10  /* XXX */
  24: 
  25: /* fromhost - tear down the streams stack then rebuild it */
  26: 
  27: void    fromhost(request)
  28: struct request_info *request;
  29: {
  30:     int     i;
  31:     int     num_mod;
  32:     struct str_list str_list;
  33:     struct str_mlist mod_buffer[MAX_MODULE_COUNT];
  34:     int     fd = request->fd;
  35: 
  36:     str_list.sl_nmods = MAX_MODULE_COUNT;
  37:     str_list.sl_modlist = &mod_buffer[0];
  38: 
  39:     /*
  40:      * On systems with WIN streams support we have to be careful about what
  41:      * is on the stream we are passed. This code POPs off all modules above
  42:      * the pseudo driver, pushes timod, gets the host address information,
  43:      * pops timod and then pushes all modules back on the stream.
  44:      *
  45:      * Some state may be lost in this process. /usr/etc/tlid seems to do special
  46:      * things to the stream depending on the TCP port being serviced. (not a
  47:      * very nice thing to do!). It is unclear what to do if this code breaks
  48:      * - the stream may be left in an unknown condition.
  49:      */
  50:     if ((num_mod = ioctl(fd, I_LIST, NULL)) < 0)
  51:     tcpd_warn("fromhost: LIST failed: %m");
  52:     if (ioctl(fd, I_LIST, &str_list) < 0)
  53:     tcpd_warn("fromhost: LIST failed: %m");
  54: 
  55:     /*
  56:      * POP stream modules except for the driver.
  57:      */
  58:     for (i = 0; i < num_mod - 1; i++)
  59:     if (ioctl(fd, I_POP, 0) < 0)
  60:         tcpd_warn("fromhost: POP %s: %m", mod_buffer[i].l_name);
  61: 
  62:     /*
  63:      * PUSH timod so that host address ioctls can be executed.
  64:      */
  65:     if (ioctl(fd, I_PUSH, "timod") < 0)
  66:     tcpd_warn("fromhost: PUSH timod: %m");
  67:     tli_host(request);
  68: 
  69:     /*
  70:      * POP timod, we're done with it now.
  71:      */
  72:     if (ioctl(fd, I_POP, 0) < 0)
  73:     tcpd_warn("fromhost: POP timod: %m");
  74: 
  75:     /*
  76:      * Restore stream modules.
  77:      */
  78:     for (i = num_mod - 2; i >= 0; i--)
  79:     if (ioctl(fd, I_PUSH, mod_buffer[i].l_name) < 0)
  80:         tcpd_warn("fromhost: PUSH %s: %m", mod_buffer[i].l_name);
  81: }

Defined functions

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Defined macros