xref: /freebsd/contrib/tcp_wrappers/try-from.c (revision d4eeb02986980bf33dd56c41ceb9fc5f180c0d47)
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 #ifndef lint
14 static char sccsid[] = "@(#) try-from.c 1.2 94/12/28 17:42:55";
15 #endif
16 
17 /* System libraries. */
18 
19 #include <sys/types.h>
20 #include <stdio.h>
21 #include <syslog.h>
22 #include <string.h>
23 
24 #ifdef TLI
25 #include <sys/tiuser.h>
26 #include <stropts.h>
27 #endif
28 
29 #ifndef STDIN_FILENO
30 #define	STDIN_FILENO	0
31 #endif
32 
33 /* Local stuff. */
34 
35 #include "tcpd.h"
36 
37 int     allow_severity = SEVERITY;	/* run-time adjustable */
38 int     deny_severity = LOG_WARNING;	/* ditto */
39 
40 main(argc, argv)
41 int     argc;
42 char  **argv;
43 {
44     struct request_info request;
45     char    buf[BUFSIZ];
46     char   *cp;
47 
48     /*
49      * Simplify the process name, just like tcpd would.
50      */
51     if ((cp = strrchr(argv[0], '/')) != 0)
52 	argv[0] = cp + 1;
53 
54     /*
55      * Turn on the "IP-underneath-TLI" detection heuristics.
56      */
57 #ifdef TLI
58     if (ioctl(0, I_FIND, "timod") == 0)
59 	ioctl(0, I_PUSH, "timod");
60 #endif /* TLI */
61 
62     /*
63      * Look up the endpoint information.
64      */
65     request_init(&request, RQ_DAEMON, argv[0], RQ_FILE, STDIN_FILENO, 0);
66     (void) fromhost(&request);
67 
68     /*
69      * Show some results. Name and address information is looked up when we
70      * ask for it.
71      */
72 
73 #define EXPAND(str) percent_x(buf, sizeof(buf), str, &request)
74 
75     puts(EXPAND("client address  (%%a): %a"));
76     puts(EXPAND("client hostname (%%n): %n"));
77     puts(EXPAND("client username (%%u): %u"));
78     puts(EXPAND("client info     (%%c): %c"));
79     puts(EXPAND("server address  (%%A): %A"));
80     puts(EXPAND("server hostname (%%N): %N"));
81     puts(EXPAND("server process  (%%d): %d"));
82     puts(EXPAND("server info     (%%s): %s"));
83 
84     return (0);
85 }
86