usr/src/cmd/tcpd/try-from.c

   1  /*
   2   * This program can be called via a remote shell command to find out if the
   3   * hostname and address are properly recognized, if username lookup works,
   4   * and (SysV only) if the TLI on top of IP heuristics work.
   5   *
   6   * Example: "rsh host /some/where/try-from".
   7   *
   8   * Diagnostics are reported through syslog(3) and redirected to stderr.
   9   *
  10   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  11   */
  12
  13 static char sccsid[] = "@(#) try-from.c 1.2 94/12/28 17:42:55";
  14
  15 /* System libraries. */
  16
  17 #include <sys/types.h>
  18 #include <stdio.h>
  19 #include <syslog.h>
  20 #include <string.h>
  21
  22 #ifdef TLI
  23 #include <sys/tiuser.h>
  24 #include <stropts.h>
  25 #endif
  26
  27 #ifndef STDIN_FILENO
  28 #define STDIN_FILENO    0
  29 #endif
  30
  31 /* Local stuff. */
  32
  33 #include "tcpd.h"
  34
  35 int     allow_severity = SEVERITY;      /* run-time adjustable */
  36 int     deny_severity = LOG_WARNING;    /* ditto */
  37
  38 int
  39 main(argc, argv)
  40 int     argc;
  41 char  **argv;
  42 {
  43     struct request_info request;
  44     char    buf[BUFSIZ];
  45     char   *cp;
  46
  47     /*
  48      * Simplify the process name, just like tcpd would.
  49      */
  50     if ((cp = strrchr(argv[0], '/')) != 0)
  51         argv[0] = cp + 1;
  52
  53     /*
  54      * Turn on the "IP-underneath-TLI" detection heuristics.
  55      */
  56 #ifdef TLI
  57     if (ioctl(0, I_FIND, "timod") == 0)
  58         ioctl(0, I_PUSH, "timod");
  59 #endif /* TLI */
  60
  61     /*
  62      * Look up the endpoint information.
  63      */
  64     request_init(&request, RQ_DAEMON, argv[0], RQ_FILE, STDIN_FILENO, 0);
  65     (void) fromhost(&request);
  66
  67     /*
  68      * Show some results. Name and address information is looked up when we
  69      * ask for it.
  70      */
  71
  72 #define EXPAND(str) percent_x(buf, sizeof(buf), str, &request)
  73
  74     puts(EXPAND("client address  (%%a): %a"));
  75     puts(EXPAND("client hostname (%%n): %n"));
  76     puts(EXPAND("client username (%%u): %u"));
  77     puts(EXPAND("client info     (%%c): %c"));
  78     puts(EXPAND("server address  (%%A): %A"));
  79     puts(EXPAND("server hostname (%%N): %N"));
  80     puts(EXPAND("server process  (%%d): %d"));
  81     puts(EXPAND("server info     (%%s): %s"));
  82
  83     return (0);
  84 }