contrib/tcp_wrappers/fromhost.c

   1  /*
   2   * On socket-only systems, fromhost() is nothing but an alias for the
   3   * socket-specific sock_host() function.
   4   *
   5   * On systems with sockets and TLI, fromhost() determines the type of API
   6   * (sockets, TLI), then invokes the appropriate API-specific routines.
   7   *
   8   * Diagnostics are reported through syslog(3).
   9   *
  10   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  11   */
  12
  13 #ifndef lint
  14 static char sccsid[] = "@(#) fromhost.c 1.17 94/12/28 17:42:23";
  15 #endif
  16
  17 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
  18
  19 /* System libraries. */
  20
  21 #include <sys/types.h>
  22 #include <sys/tiuser.h>
  23 #include <stropts.h>
  24
  25 /* Local stuff. */
  26
  27 #include "tcpd.h"
  28
  29 /* fromhost - find out what network API we should use */
  30
  31 void    fromhost(request)
  32 struct request_info *request;
  33 {
  34
  35     /*
  36      * On systems with streams support the IP network protocol family may be
  37      * accessible via more than one programming interface: Berkeley sockets
  38      * and the Transport Level Interface (TLI).
  39      *
  40      * Thus, we must first find out what programming interface to use: sockets
  41      * or TLI. On some systems, sockets are not part of the streams system,
  42      * so if request->fd is not a stream we simply assume sockets.
  43      */
  44
  45     if (ioctl(request->fd, I_FIND, "timod") > 0) {
  46         tli_host(request);
  47     } else {
  48         sock_host(request);
  49     }
  50 }
  51
  52 #endif /* TLI || PTX || TLI_SEQUENT */