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
14static 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
37int     allow_severity = SEVERITY;	/* run-time adjustable */
38int     deny_severity = LOG_WARNING;	/* ditto */
39
40main(int argc, char **argv)
41{
42    struct request_info request;
43    char    buf[BUFSIZ];
44    char   *cp;
45
46    /*
47     * Simplify the process name, just like tcpd would.
48     */
49    if ((cp = strrchr(argv[0], '/')) != 0)
50	argv[0] = cp + 1;
51
52    /*
53     * Turn on the "IP-underneath-TLI" detection heuristics.
54     */
55#ifdef TLI
56    if (ioctl(0, I_FIND, "timod") == 0)
57	ioctl(0, I_PUSH, "timod");
58#endif /* TLI */
59
60    /*
61     * Look up the endpoint information.
62     */
63    request_init(&request, RQ_DAEMON, argv[0], RQ_FILE, STDIN_FILENO, 0);
64    (void) fromhost(&request);
65
66    /*
67     * Show some results. Name and address information is looked up when we
68     * ask for it.
69     */
70
71#define EXPAND(str) percent_x(buf, sizeof(buf), str, &request)
72
73    puts(EXPAND("client address  (%%a): %a"));
74    puts(EXPAND("client hostname (%%n): %n"));
75    puts(EXPAND("client username (%%u): %u"));
76    puts(EXPAND("client info     (%%c): %c"));
77    puts(EXPAND("server address  (%%A): %A"));
78    puts(EXPAND("server hostname (%%N): %N"));
79    puts(EXPAND("server process  (%%d): %d"));
80    puts(EXPAND("server info     (%%s): %s"));
81
82    return (0);
83}
84