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Current Path: /usr/src/contrib/tcp_wrappers

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📄 BLURB(1.7 KB)
📄 Banners.Makefile(2.17 KB)
📄 CHANGES(18.75 KB)
📄 DISCLAIMER(1.21 KB)
📄 Makefile(32.68 KB)
📄 README(47.08 KB)
📄 README.IRIX(2.57 KB)
📄 README.NIS(6.52 KB)
📄 clean_exit.c(1.07 KB)
📄 diag.c(1.44 KB)
📄 environ.c(4.75 KB)
📄 eval.c(3.59 KB)
📄 fakelog.c(1012 B)
📄 fix_options.c(3.7 KB)
📄 fromhost.c(1.37 KB)
📄 hosts_access.3(3.52 KB)
📄 hosts_access.5(15.97 KB)
📄 hosts_access.c(14.13 KB)
📄 hosts_ctl.c(1.08 KB)
📄 hosts_options.5(6.5 KB)
📄 inetcf.c(8.03 KB)
📄 inetcf.h(516 B)
📄 misc.c(1.9 KB)
📄 miscd.c(3.07 KB)
📄 mystdarg.h(571 B)
📄 myvsyslog.c(766 B)
📄 ncr.c(2.52 KB)
📄 options.c(13.85 KB)
📄 patchlevel.h(88 B)
📄 percent_m.c(797 B)
📄 percent_x.c(2.37 KB)
📄 printf.ck(39 B)
📄 ptx.c(2.65 KB)
📄 refuse.c(911 B)
📄 rfc931.c(5.95 KB)
📄 safe_finger.c(4.98 KB)
📄 scaffold.c(6.38 KB)
📄 scaffold.h(370 B)
📄 setenv.c(931 B)
📄 shell_cmd.c(2.13 KB)
📄 socket.c(12.06 KB)
📄 strcasecmp.c(3.78 KB)
📄 tcpd.8(6.86 KB)
📄 tcpd.c(3.49 KB)
📄 tcpd.h(8.18 KB)
📄 tcpdchk.8(2.51 KB)
📄 tcpdchk.c(12.84 KB)
📄 tcpdmatch.8(3.18 KB)
📄 tcpdmatch.c(10.69 KB)
📄 tli-sequent.c(4.85 KB)
📄 tli-sequent.h(411 B)
📄 tli.c(10.34 KB)
📄 try-from.c(2.01 KB)
📄 update.c(3.05 KB)
📄 vfprintf.c(3.12 KB)
📄 workarounds.c(7.57 KB)

Editing: tcpd.c

/*
  * 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.
  *
  * $FreeBSD$
  */

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

/* 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>
#include <unistd.h>

#ifndef MAXPATHNAMELEN
#define MAXPATHNAMELEN	BUFSIZ
#endif

#ifndef STDIN_FILENO
#define STDIN_FILENO	0
#endif

/* 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. */

#ifdef DAEMON_UMASK
    umask(DAEMON_UMASK);
#endif

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

if (argv[0][0] == '/') {
	strlcpy(path, argv[0], sizeof(path));
	argv[0] = strrchr(argv[0], '/') + 1;
    } else {
	snprintf(path, sizeof(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);
#else
    (void) openlog(argv[0], LOG_PID);
#endif

/*
     * 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);
    fromhost(&request);

/*
     * 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.
     */

#ifdef PARANOID
    if (STR_EQ(eval_hostname(request.client), paranoid))
	refuse(&request);
#endif

/*
     * 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.
     */

#ifdef KILL_IP_OPTIONS
    fix_options(&request);
#endif

/*
     * 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.
     */

#ifdef HOSTS_ACCESS
    if (!hosts_access(&request))
	refuse(&request);
#endif

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

#ifdef INET6
    syslog(allow_severity, "connect from %s (%s)",
	   eval_client(&request), eval_hostaddr(request.client));
#else
    syslog(allow_severity, "connect from %s", eval_client(&request));
#endif
    closelog();
    (void) execv(path, argv);
    syslog(LOG_ERR, "error: cannot execute %s: %m", path);
    clean_exit(&request);
    /* NOTREACHED */
}

003 File Manager

Editing: tcpd.c

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