8322 nl: misleading-indentation

[unleashed/tickless.git] / usr / src / cmd / bnu / permission.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */
/*
 * Copyright (c) 2016 by Delphix. All rights reserved.
 */

#pragma ident   "%Z%%M% %I%     %E% SMI"

#ifndef UUCHECK
#include "uucp.h"
#endif


/*  field array indexes for PERMISSIONS parameters */
#define U_LOGNAME       0
#define U_MACHINE       1
#define U_CALLBACK      2
#define U_REQUEST       3
#define U_SENDFILES     4
#define U_READPATH      5
#define U_WRITEPATH     6
#define U_NOREADPATH    7
#define U_NOWRITEPATH   8
#define U_MYNAME        9
#define U_COMMANDS      10
#define U_VALIDATE      11
#define U_PUBDIR        12
#define U_DIRECT        13
#define U_ALIAS         14
#define U_PATH          15
/*  NUMFLDS should be one more than the highest U_ value */
#define NUMFLDS         16

/* fields found in PERMISSIONS for requested system/login */
static char *_Flds[NUMFLDS];

/* keyword/value structure */
struct keywords {
        char* kword;
        int kvalue;
};
static struct keywords _Kwords[] = {
        {"LOGNAME", U_LOGNAME},
        {"MACHINE", U_MACHINE},
        {"CALLBACK", U_CALLBACK},
        {"REQUEST", U_REQUEST},
        {"SENDFILES", U_SENDFILES},
        {"READ", U_READPATH},
        {"WRITE", U_WRITEPATH},
        {"NOREAD", U_NOREADPATH},
        {"NOWRITE", U_NOWRITEPATH},
        {"MYNAME", U_MYNAME},
        {"COMMANDS", U_COMMANDS},
        {"VALIDATE", U_VALIDATE},
        {"PUBDIR", U_PUBDIR},
        {"DIRECT", U_DIRECT},
        {"ALIAS", U_ALIAS},
        {"PATH", U_PATH},
};

#define MAXCMDS         30
#define MAXPATHS        20

/* for all options on paths - read, write, noread, nowrite */
/* NB: all pointers assumed to point to static data */
static char *_RPaths[MAXPATHS+1];
static char *_WPaths[MAXPATHS+1];
static char *_NoRPaths[MAXPATHS+1];
static char *_NoWPaths[MAXPATHS+1];
static char *_Commands[MAXCMDS+1];
static char _Cmd_defaults[BUFSIZ];

/* option variables */
static int _Request;    /* TRUE can request, FALSE can not request files */
static int _Switch;     /* FALSE requires a call back to send any files */
static int _CallBack;   /* TRUE for call back for any transaction */
static int _NoSpool;    /* TRUE if delivering directly to destination file */
static char _MyName[MAXBASENAME+1];     /* Myname from PERMISSIONS file */
/* NB: _Pubdir and _Path assumed to point to dynamic data */
static char *_Pubdir = NULL;            /* PUBDIR from PERMISSIONS file */
static char *_Path = NULL;              /* PATH from PERMISSIONS file */

struct name_value
{
        char *name;
        char *value;
};

/* file pointer for PERMISSIONS */
static FILE *Fp = NULL;

/* functions */
extern char *next_token(), *nextarg();
extern int parse_tokens(), canPath(), mkdirs();
static void fillFlds();
static void fillList();
static int cmdMatch(), listMatch(), nameMatch(),
        userFind(), validateFind();

int
noSpool()
{
        return(_NoSpool);
}

/*
 * fill in fields for login name
 * name - the login id
 * rmtname - remote system name
 *
 * return:
 *      0 -> found login name
 *      FAIL -> did not find login
 */

int
logFind(name, rmtname)
char *name, *rmtname;
{
        int ret;
        DEBUG(5, "logFind called (name: %s, ", name);
        DEBUG(5, "rmtname: %s)\n", rmtname);

        ret = validateFind (rmtname);
        if (ret == SUCCESS) { /* found VALIDATE entry */
            ret = userFind (name, rmtname, U_VALIDATE);
            if (ret) {
                DEBUG(5, "machine/login match failed%s", "");
                return(FAIL);
            }
        }
        else
            ret = userFind (name, "", U_LOGNAME);

        DEBUG(7, "_Request (%s), ",
            requestOK() ? "TRUE" : "FALSE");
        DEBUG(7, "_Switch (%s), ",
            switchRole() ? "TRUE" : "FALSE");
        DEBUG(7, "_CallBack (%s), ",
            callBack() ? "TRUE" : "FALSE");
        DEBUG(7, "_MyName (%s), ", _MyName);
        DEBUG(7, "_NoSpool (%s), ",
            noSpool() ? "TRUE" : "FALSE");
        return(ret);
}

/*
 * fill in fields for machine name
 * return:
 *      0 -> found machine name
 *      FAIL -> did not find machine
 */

int
mchFind(name)
char *name;
{
        int i, ret;
        DEBUG(5, "mchFind called (%s)\n", name);
        if ( (ret = userFind (name, "", U_MACHINE)) == FAIL)
            /* see if there is a default line */
            (void) userFind ("OTHER", "", U_MACHINE);

        /*  mchFind is from MASTER mode - switch role is always ok */
        _Switch = TRUE;

        DEBUG(7, "_Request (%s), ",
            requestOK() ? "TRUE" : "FALSE");
        DEBUG(7, "_Switch (%s), ",
            switchRole() ? "TRUE" : "FALSE");
        DEBUG(7, "_CallBack (%s), ",
            callBack() ? "TRUE" : "FALSE");
        DEBUG(7, "_MyName (%s), ", _MyName);
        DEBUG(7, "_NoSpool (%s), ",
            noSpool() ? "TRUE" : "FALSE");
        for (i=0; _Commands[i] != NULL; i++)
            DEBUG(7, "_Commands %s\n",  _Commands[i]);
        return(ret);
}

/*
 * this function will find a login name in the LOGNAME
 * field.
 * input:
 *      name    -> who the remote says they are
 * return:
 *      SUCCESS -> found
 *      FAIL    -> not found
 */
static int
nameMatch(name, fld)
char *name, *fld;
{
        char *arg;

        if (fld == NULL)
            return(FAIL);

        while (*fld) {
            fld = nextarg(fld, &arg);
            if (EQUALS(arg, name))
                return(SUCCESS);
        }
        return (FAIL);
}


/*
 * interpret the _Flds options and set the option variables
 */
static void
fillFlds()
{

        if (_Flds[U_REQUEST] != NULL) {
                if (EQUALS(_Flds[U_REQUEST], "yes"))
                        _Request = TRUE;
                else
                        _Request = FALSE;
        }

        if (_Flds[U_SENDFILES] != NULL) {
                if (EQUALS(_Flds[U_SENDFILES], "yes"))
                        _Switch = TRUE;
                else
                        _Switch = FALSE;
        }

        if (_Flds[U_CALLBACK] != NULL) {
                if (EQUALS(_Flds[U_CALLBACK], "yes"))
                        _CallBack = TRUE;
                else
                        _CallBack = FALSE;
        }

        if (_Flds[U_DIRECT] != NULL) {
                if (EQUALS(_Flds[U_DIRECT], "yes"))
                        _NoSpool = TRUE;
                else
                        _NoSpool = FALSE;
        }

        if (_Flds[U_MYNAME] != NULL) {
                strncpy(_MyName, _Flds[U_MYNAME], MAXBASENAME);
                _MyName[MAXBASENAME] = NULLCHAR;
        }

        if (_Flds[U_PUBDIR] != NULL) {
                if (_Pubdir != NULL)
                    free(_Pubdir);      /* get rid of previous one */
                _Pubdir = strdup(_Flds[U_PUBDIR]);
#ifndef UUCHECK
                ASSERT(_Pubdir != NULL, Ct_ALLOCATE, _Flds[U_PUBDIR], 0);
#else /* UUCHECK */
                if (_Pubdir == NULL) {
                    perror(gettext("malloc() error"));
                    exit(1);
                }
#endif /* UUCHECK */
                Pubdir = _RPaths[0] = _WPaths[0] = _Pubdir; /* reset default */
        }

        if (_Flds[U_PATH] != NULL) {
                if (_Path != NULL)
                    free(_Path);        /* get rid of previous one */
                _Path = strdup(_Flds[U_PATH]);
#ifndef UUCHECK
                ASSERT(_Path != NULL, Ct_ALLOCATE, _Flds[U_PATH], 0);
#else /* UUCHECK */
                if (_Path == NULL) {
                    perror(gettext("malloc() error"));
                    exit(1);
                }
#endif /* UUCHECK */
        }

        return;
}

/*
 * fill in the list vector for the system/login
 * input:
 *      type - list type (read, write, noread, nowrite, command)
 * output:
 *      list - filled in with items.
 * return:
 *      number of items in list
 */
static void
fillList(type, list)
int type;
char *list[];
{
        char *p;
        int num;
        int maxlist = 0;

        p = _Flds[type];

        /* find list limit */
        if (type == U_READPATH || type == U_WRITEPATH
         || type == U_NOREADPATH || type == U_NOWRITEPATH)
                maxlist = MAXPATHS;
        else if (type == U_COMMANDS)
                maxlist = MAXCMDS;

        if (p == NULL || !*p) {
                 /* no names specified, default already setup */
                return;
        }

        num = 0;
        while (*p && num < maxlist) {
                list[num] = p;
                if (*p == ':') {        /* null path */
                        *p++ = NULLCHAR;
                        continue;
                }
                while (*p && *p != ':')
                        p++;
                if (*p == ':')
                        *p++ = NULLCHAR;
                DEBUG(7, "list (%s) ", list[num]);
                num++;
        }
        DEBUG(7, "num = %d\n", num);
        list[num] = NULL;
        return;
}

/*
 * Find the line of PERMISSIONS for login.
 * The search is determined by the type field
 * (type=U_LOGNAME, U_MACHINE or U_VALIDATE)
 * For U_LOGNAME:
 *      search for "name" in a LOGNAME= option
 * For U_MACHINE:
 *      search for "name" in a MACHINE= option
 * For U_VALIDATE:
 *      search for "rmtname" in a VALIDATE= option and
 *      for the same entry see if "name" is in the LOGNAME= option
 * input:
 *      name -> search name
 *      logname -> for validate entry
 *      type -> U_MACHINE or U_LOGNAME
 * output:
 *      The global values of all options will be set
 *      (e.g. _RPaths, _WPaths,  _Request, ...)
 * return:
 *      0 -> ok
 *      FAIL -> no match found
 */
static int
userFind(name, rmtname, type)
char *name, *rmtname;
int type;
{
        char *p, *arg, *buf = NULL;
        static char default_buf[BUFSIZ];

        if (name != NULL && strcmp(name, "DEFAULT") != 0) {
                /* call ourself recursively to set defaults */
                (void) userFind("DEFAULT", "", U_MACHINE);
        } else {
                /*
                 * Handle case where looking for DEFAULT entry.
                 * First initialize all defaults to their "base"
                 * values.  Then the DEFAULT entry, if found,
                 * will override these settings.
                 */
                _Request = FALSE;
                _CallBack = FALSE;
                _Switch = FALSE;
                _NoSpool = FALSE;
                _MyName[0] = NULLCHAR;
                _RPaths[0] = _WPaths[0] = PUBDIR;       /* default is public */
                _RPaths[1] = _WPaths[1] = NULLCHAR;
                _NoRPaths[0] = NULLCHAR;
                _NoWPaths[0] = NULLCHAR;
                if (_Pubdir != NULL)
                        free(_Pubdir);
                Pubdir = _Pubdir = strdup(PUBDIR);
                if (_Path != NULL)
                        free(_Path);
                _Path = strdup(PATH);
                /* set up Commands defaults */
                _Flds[U_COMMANDS] = strcpy(_Cmd_defaults, DEFAULTCMDS);
                fillList(U_COMMANDS, _Commands);
                /*
                 * put defaults we read in in here so they're not overwritten
                 * by non-DEFAULT entries.
                 */
                buf = default_buf;
        }

        if (name == NULL)       /* use defaults */
                return(0);      /* I don't think this will ever happen */

        if ( (Fp = fopen(PERMISSIONS, "r")) == NULL) {
                DEBUG(5, "can't open %s\n", PERMISSIONS);
                return(FAIL);
        }

        for (;;) {
            if (parse_tokens (_Flds, buf) != 0) {
                (void) fclose(Fp);
                DEBUG(5, "name (%s) not found; return FAIL\n", name);
                return(FAIL);
            }

            p = _Flds[type];
            while (p && *p) {
                p = nextarg(p, &arg);
                switch (type) {
                case U_VALIDATE:
                    if (EQUALS(arg, rmtname)
                        && nameMatch(name, _Flds[U_LOGNAME])==SUCCESS)
                                break;
                    continue;

                case U_LOGNAME:
                    if (EQUALS(arg, name))
                                break;
                    continue;

                case U_MACHINE:
                    if (EQUALSN(arg, name, MAXBASENAME))
                                break;
                    continue;
                }

                (void) fclose(Fp);
                fillFlds();

                /* fill in path lists */
                fillList(U_READPATH, _RPaths);
                fillList(U_WRITEPATH, _WPaths);
                if (!requestOK())
                    _Flds[U_NOREADPATH] = "/";
                fillList(U_NOREADPATH, _NoRPaths);
                fillList(U_NOWRITEPATH, _NoWPaths);

                /* fill in command list */
                fillList(U_COMMANDS, _Commands);

                return(0);
            }
        }
}

/*
 * see if name is in a VALIDATE option
 * return:
 *      FAIL -> not found
 *      SUCCESS -> found
 */
static int
validateFind(name)
char *name;
{

        if ( (Fp = fopen(PERMISSIONS, "r")) == NULL) {
                DEBUG(5, "can't open %s\n", PERMISSIONS);
                return(FAIL);
        }

        for (;;) {
            if (parse_tokens (_Flds, NULL) != 0) {
                DEBUG(5, "validateFind (%s) FAIL\n", name);
                (void) fclose(Fp);
                return(FAIL);
            }

            if (_Flds[U_VALIDATE] == NULL)
                continue;
            if (nameMatch(name, _Flds[U_VALIDATE])==SUCCESS) {
                (void) fclose(Fp);
                return (SUCCESS);
            }
        }

}

/*
 * see if name is in an ALIAS option
 * return:
 *      NULL -> not found
 *      otherwise -> machine name
 */
char *
aliasFind(name)
char *name;
{

        if ( (Fp = fopen(PERMISSIONS, "r")) == NULL) {
                DEBUG(5, "can't open %s\n", PERMISSIONS);
                return(NULL);
        }

        for (;;) {
            if (parse_tokens (_Flds, NULL) != 0) {
                DEBUG(5, "aliasFind (%s) FAIL\n", name);
                (void) fclose(Fp);
                return(NULL);
            }

            if (_Flds[U_ALIAS] == NULL)
                continue;
            if (nameMatch(name, _Flds[U_ALIAS])==SUCCESS) {
                (void) fclose(Fp);
#ifndef UUCHECK
                ASSERT(strchr(_Flds[U_MACHINE], ':') == NULL,
                    "PERMISSIONS file: ALIAS is one-to-many:",
                    _Flds[U_MACHINE], 0);
#else /* UUCHECK */
                if (strchr(_Flds[U_MACHINE], ':') != NULL) {
                    printf(gettext("ALIAS is one-to-many: %s -> %s\n"),
                        name, _Flds[U_MACHINE]);
                    return(NULL);
                }
#endif /* UUCHECK */
                return(_Flds[U_MACHINE]);
            }
        }

}

/*
 * parse a line in PERMISSIONS and return a vector
 * of fields (flds)
 *
 * return:
 *      0 - OK
 *      EOF - at end of file
 */
int
parse_tokens(flds, buf)
char *flds[];
char *buf;
{
        int i;
        char *p;
        struct name_value pair;
        static char _line[BUFSIZ];
        char *line = buf;

        if (buf == NULL)
                line = _line;   /* if no buffer specified, use default */
        /* initialize defaults  in case parameter is not specified */
        for (i=0;i<NUMFLDS;i++)
                flds[i] = NULL;

        if (getuline(Fp, line) == 0)
                return(EOF);

        for (p=line;p && *p;) {
                p = next_token (p, &pair);

                for (i=0; i<NUMFLDS; i++) {
                        if (EQUALS(pair.name, _Kwords[i].kword)) {
                                flds[i] = pair.value;
                                break;
                        }
                }
#ifndef UUCHECK
                ASSERT(i<NUMFLDS, "PERMISSIONS file: BAD OPTION--",
                    pair.name, NUMFLDS);
#else /* UUCHECK */
                if (i >= NUMFLDS) {
                        DEBUG(3, "bad option (%s) in PERMISSIONS\n",pair.name);
                        (void) printf("\n*****************************\n");
                        (void) printf(gettext("**BAD OPTION in PERMISSIONS file: %s\n"),
                                pair.name);
                        (void) printf("*****************************\n");
                        Uerrors++;
                        return(0);
                }
#endif /* UUCHECK */

        }
        return(0);
}

/*
 * return a name value pair
 *      string  -> input pointer
 *      pair    -> name value pair
 * return:
 *      pointer to next character
 */
char *
next_token (string, pair)
char *string;
struct name_value *pair;
{
        char    *prev = _uu_setlocale(LC_ALL, "C");

        while ( (*string) && ((*string == '\t') || (*string == ' ')) )
                string++;

        pair->name = string;
        while ((*string) && (*string != '='))
                string++;
        if (*string)
                *string++ = NULLCHAR;

        pair->value = string;
        while ((*string) && (*string != '\t') && (*string != ' ')
            && (*string != '\n'))
                string++;

        if (*string)
                *string++ = NULLCHAR;

        (void) _uu_resetlocale(LC_ALL, prev);
        return (string);
}

/*
 * get a line from the PERMISSIONS
 * take care of comments (#) in col 1
 * and continuations (\) in last col
 * return:
 *      len of line
 *      0 -> end of file
 */
int
getuline(fp, line)
FILE *fp;
char *line;
{
        char *p, *c;
        char buf[BUFSIZ];

        p = line;
        for (;fgets(buf, BUFSIZ, fp) != NULL;) {
                /* remove trailing white space */
                c = &buf[strlen(buf)-1];
                while (c>=buf && (*c == '\n' || *c == '\t' || *c == ' ') )
                        *c-- = NULLCHAR;

                if (buf[0] == '#' || buf[0] == '\n' || buf[0] == NULLCHAR)
                        continue;
                (void) strcpy(p, buf);
                p += strlen(buf);
                if ( *(p-1) == '\\')
                        p--;
                else
                        break;
        }

        return(p-line);
}


#define SMAX    15

/*
 * get the next colon separated argument from the list
 * return:
 *      p -> pointer to next arg in string
 * input:
 *      str -> pointer to input string
 * output:
 *      name -> pointer to arg string
 */
char *
nextarg(str, name)
char *str, **name;
{
        char *p, *b;
        static char buf[SMAX+1];

        for(b=buf,p=str; *p != ':' && *p && b < buf+SMAX;)
                *b++ = *p++;
        *b++ = NULLCHAR;
        if (*p == ':')
                p++;
        *name = buf;
        return(p);
}

/*
 * check if requesting files is permitted
 * return
 *      TRUE -> request permitted
 *      FALSE -> request denied
 */
int
requestOK()
{
        return(_Request);
}

/*
 * myName - return my name from PERMISSIONS file
 *      or if not there, from  uucpname()
 * return: none
 */

void
myName(name)
char *name;
{
        if (*_MyName)
                strcpy(name, _MyName);
        else
                uucpname(name);
        return;
}

/*
 * check for callback required for any transaction
 * return:
 *      TRUE -> callback required
 *      FALSE-> callback NOT required
 */
int
callBack()
{
        return(_CallBack);
}

/*
 * check for callback to send any files from here
 * This means that the called (SLAVE) system will not switch roles.
 * return:
 *      TRUE -> callback requried to send files
 *      FALSE-> callback NOT required to send files
 */
int
switchRole()
{
        return(_Switch);
}

/*
 * Check to see if command is valid for a specific machine.
 * The PERMISSIONS file has an option COMMANDS=name1:name2:... for
 * any machine that does not have the default list which is
 * rmail
 * Note that the PERMISSIONS file is read once for each system
 * at the time the Rmtname is set in xprocess().
 * Return codes:
 *      ok: TRUE
 *      fail: FALSE
 */
int
cmdOK(cmd, fullcmd)
char    *cmd, *fullcmd;
{
        DEBUG(7, "cmdOK(%s, )\n", cmd);
        return(cmdMatch(cmd, fullcmd));
}


/*
 * check a name against a list
 * input:
 *      name    -> name
 *      list    -> list of names
 * return:
 *      TRUE    -> found path
 *      FALSE   -> not found
 */
static int
listMatch(name, list)
char *name, *list[];
{
    int i;
    char *temp, *tend;
    struct stat statbuf;
    dev_t _dev[MAXPATHS+1];
    ino_t _ino[MAXPATHS+1];

    /* ino set to 0 so stat is only done first time */
    for (i=0; list[i] != NULL; i++)
        _ino[i] = 0;

    /* try to match inodes */
    if ( (temp = strdup(name)) != NULL ) {
        for ( tend = temp + strlen(temp) ; *temp; ) {
            if ( stat(temp, &statbuf) == 0 ) {
                for (i=0; list[i] != NULL; i++) {
                    if ( _ino[i] == 0 ) {
                        struct stat tempbuf;
                        if ( stat(list[i], &tempbuf) == 0 ) {
                            _dev[i] = tempbuf.st_dev;
                            _ino[i] = tempbuf.st_ino;
                        }
                    }
                    if ( _dev[i] == statbuf.st_dev
                      && _ino[i] == statbuf.st_ino ) {
                        free(temp);
                        return(TRUE);
                    }
                }
            }
            *tend = '\0';
            if ( (tend = strrchr(temp, '/')) == NULL ) {
                free(temp);
                break;
            } else
                *(tend+1) = '\0';
        }
    }

    return(FALSE);
}


/*
 * Check "name" against a BASENAME or full name of _Commands list.
 * If "name" specifies full path, check full, else check BASENAME.
 *  e.g. "name" rmail matches list item /usr/bin/rmail
 * input:
 *      name    -> name
 * output:
 *      fullname -> copy full command name into fullname if
 *                  a full path was specified in _Commands;
 *                  if not, put name into fullname.
 * return:
 *      TRUE    -> found path
 *      FALSE   -> not found
 */
static int
cmdMatch(name, fullname)
char *name;
char *fullname;
{
        int i;
        char *bname;
        int allok = FALSE;

        for (i=0; _Commands[i] != NULL; i++) {
                if (EQUALS(_Commands[i], "ALL")) {
                        /* if ALL specified in the list
                         * set allok and continue in case
                         * a full path name is specified for the command
                         */
                        allok = TRUE;
                        continue;
                }
                if (name[0] != '/')
                        bname = BASENAME(_Commands[i], '/');
                else
                        bname = _Commands[i];
                DEBUG(7, "bname=%s\n", bname);
                if (EQUALS(bname, name)) {
                        (void) strcpy(fullname, _Commands[i]);
                        return(TRUE);
                }
        }
        if (allok == TRUE) {
                /* ALL was specified and the command was not found in list */
                (void) strcpy(fullname, name);
                return(TRUE);
        }
        (void) strcpy(fullname, "NuLL");        /* this is a dummy command */
        return(FALSE);
}


/*
 * check the paths for this login/machine
 * input:
 *      path    pathname
 *      flag    CK_READ or CK_WRITE
 * output:
 *      path    may be modified to canonical form
 *              (../, ./, // will be interpreted/removed)
 * returns:
 *      0               -> success
 *      FAIL            -> failure - not a valid path for access
 */
int
chkpth(path, flag)
char *path;
{
        char *s;

        /*
         * this is probably redundant,
         * because expfile did it, but that's ok
         * Note - the /../ check is not required because of canPath
         */
        if (canPath(path) == FAIL)
                return(FAIL);

        if (flag == CK_READ)
                if (listMatch(path, _RPaths)
                && !listMatch(path, _NoRPaths))
                        return(0);
        if (flag == CK_WRITE)
                if (listMatch(path, _WPaths)
                && !listMatch(path, _NoWPaths))
                        return(0);


        /* ok if uucp generated D. or X. name for the spool directory */
        if (PREFIX(RemSpool, path) ) {
                s = &path[strlen(RemSpool)];
                if ( (*s++ == '/')
                  && (*s == DATAPRE || *s == XQTPRE)
                  && (*(++s) == '.')
                  && (strchr(s, '/') == NULL) )
                        return(0);
        }

        /*  path name not valid */
        return(FAIL);
}

/*
 * check write permission of file.
 * if mopt != NULL and permissions are ok,
 * a side effect of this routine is to make
 * directories up to the last part of the
 * "to" ( if they do not exit).
 * Input:
 *      to - a path name of the destination file or directory
 *      from - full path name of source file
 *      opt - create directory option (NULL - don't create)
 * Output:
 *      to - will be the full path name of the destination file
 * returns:
 *      0       ->success
 *      FAIL    -> failure
 */
int
chkperm(from, to, opt)
char *from, *to, *opt;
{
        char *lxp, *p;
        struct stat s;
        char dir[MAXFULLNAME];

        if (*(p = LASTCHAR(to)) == '/') {
            if (strlcpy(p+1, BASENAME(from, '/'), MAXFULLNAME - strlen(to)) >=
                MAXFULLNAME - strlen(to)) {
                    return(FAIL);
            }
        } else if (DIRECTORY(to)) {
            *++p = '/';
            if (strlcpy(p+1, BASENAME(from, '/'), MAXFULLNAME - strlen(to)) >=
                MAXFULLNAME - strlen(to)) {
                    return(FAIL);
            }
        }

        /* to is now the full path name of the destination file */

        if (WRITEANY(to))
            return(0);
        if (stat(to, &s) == 0)
            return(FAIL);       /* file exists, but not writeable */

        /* file does not exist--check directory and make when necessary */

        (void) strcpy(dir, to);
        if ( (lxp=strrchr(dir, '/')) == NULL)
            return(FAIL);       /* no directory part of name */
        if (lxp == dir) /* at root */
            lxp++;
        *lxp = NULLCHAR;

        /* should check WRITEANY on parent before mkdirs() */
        if (!DIRECTORY(dir)) {
            if (opt == NULL)
                return(FAIL);   /* no directory and no opt to make them */
            else if (mkdirs(dir, PUBMASK) == FAIL)
                return(FAIL);
        }

        /* the directory now exists--check for writability */
        if (EQUALS(RemSpool, dir) || WRITEANY(dir))
            return(0);

        return(FAIL);
}