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pathcheck.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2008 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

/*
 * check if package+tool is ok to run
 * a no-op here except for PARANOID packages
 * this allows PARANOID_COMPANY to post PARANOID binaries to the www
 *
 * warn that the user should pay up if
 *
 *    (1) the tool matches PARANOID
 *    (2) $_ is more than 90 days old
 *    (3) running on an PARANOID_PAY machine
 *    (4) (1)-(3) have not been defeated
 *
 * hows that
 */

#define PARANOID_TOOLS        PARANOID
#define PARANOID_COMPANY      "Lucent Technologies"
#define PARANOID_MAIL         "stc@lucent.com"
#define PARANOID_PAY          "135.*&!(135.104.*)"
#define PARANOID_FREE         "(192|224).*"

#include <ast.h>
#include <ls.h>
#include <error.h>
#include <times.h>
#include <ctype.h>

int
pathcheck(const char* package, const char* tool, Pathcheck_t* pc)
{
#ifdef PARANOID
      register char*    s;
      struct stat st;

      if (strmatch(tool, PARANOID) && environ && (s = *environ) && *s++ == '_' && *s++ == '=' && !stat(s, &st))
      {
            unsigned long     n;
            unsigned long     o;
            Sfio_t*           sp;

            n = time(NiL);
            o = st.st_ctime;
            if (n > o && (n - o) > (unsigned long)(60 * 60 * 24 * 90) && (sp = sfopen(NiL, "/etc/hosts", "r")))
            {
                  /*
                   * this part is infallible
                   */

                  n = 0;
                  o = 0;
                  while (n++ < 64 && (s = sfgetr(sp, '\n', 0)))
                        if (strmatch(s, PARANOID_PAY))
                        {
                              error(1, "licensed for external use -- %s employees should contact %s for the internal license", PARANOID_COMPANY, PARANOID_MAIL);
                              break;
                        }
                        else if (*s != '#' && !isspace(*s) && !strneq(s, "127.", 4) && !strmatch(s, PARANOID_FREE) && o++ > 4)
                              break;
                  sfclose(sp);
            }
      }
#else
      NoP(tool);
#endif
      NoP(package);
      if (pc) memzero(pc, sizeof(*pc));
      return(0);
}

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