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Sourcecode: tcp-wrappers version File versions  Download package


  * General front end for stream and datagram IP services. This program logs
  * the remote host name and then invokes the real daemon. For example,
  * install as /usr/etc/{tftpd,fingerd,telnetd,ftpd,rlogind,rshd,rexecd},
  * after saving the real daemons in the directory specified with the
  * REAL_DAEMON_DIR macro. This arrangement requires that the network daemons
  * are started by inetd or something similar. Connections and diagnostics
  * are logged through syslog(3).
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.

#ifndef lint
static char sccsid[] = "@(#) tcpd.c 1.10 96/02/11 17:01:32";

/* System libraries. */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <syslog.h>
#include <string.h>


#define STDIN_FILENO    0

/* Local stuff. */

#include "patchlevel.h"
#include "tcpd.h"

int     allow_severity = SEVERITY;  /* run-time adjustable */
int     deny_severity = LOG_WARNING;      /* ditto */

main(argc, argv)
int     argc;
char  **argv;
    struct request_info request;
    char    path[MAXPATHNAMELEN];

    /* Attempt to prevent the creation of world-writable files. */


     * If argv[0] is an absolute path name, ignore REAL_DAEMON_DIR, and strip
     * argv[0] to its basename.

    if (argv[0][0] == '/') {
      strcpy(path, argv[0]);
      argv[0] = strrchr(argv[0], '/') + 1;
    } else {
      sprintf(path, "%s/%s", REAL_DAEMON_DIR, argv[0]);

     * Open a channel to the syslog daemon. Older versions of openlog()
     * require only two arguments.

#ifdef LOG_MAIL
    (void) openlog(argv[0], LOG_PID, FACILITY);
    (void) openlog(argv[0], LOG_PID);

     * Find out the endpoint addresses of this conversation. Host name
     * lookups and double checks will be done on demand.

    request_init(&request, RQ_DAEMON, argv[0], RQ_FILE, STDIN_FILENO, 0);

     * Optionally look up and double check the remote host name. Sites
     * concerned with security may choose to refuse connections from hosts
     * that pretend to have someone elses host name.

    if (STR_EQ(eval_hostname(request.client), paranoid))

     * The BSD rlogin and rsh daemons that came out after 4.3 BSD disallow
     * socket options at the IP level. They do so for a good reason.
     * Unfortunately, we cannot use this with SunOS 4.1.x because the
     * getsockopt() system call can panic the system.


     * Check whether this host can access the service in argv[0]. The
     * access-control code invokes optional shell commands as specified in
     * the access-control tables.

    if (!hosts_access(&request))

    /* Report request and invoke the real daemon program. */

    syslog(allow_severity, "connect from %s", eval_client(&request));
    (void) execv(path, argv);
    syslog(LOG_ERR, "error: cannot execute %s: %m", path);
    /* NOTREACHED */

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