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deb-mbse/unix/getdef.c

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2009-05-15 20:01:56 +00:00
/*****************************************************************************
*
* $Id: getdef.c,v 1.4 2005/08/30 17:53:35 mbse Exp $
* Purpose ...............: MBSE BBS Shadow Password Suite
* Original Source .......: Shadow Password Suite
* Original Copyright ....: Julianne Frances Haugh and others.
*
*****************************************************************************
* Copyright (C) 1997-2005
*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* MBSE BBS is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MBSE BBS; see the file COPYING. If not, write to the Free
* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*****************************************************************************/
#include "../config.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <syslog.h>
#include <sys/param.h>
#include <pwd.h>
#include "getdef.h"
/*
* A configuration item definition.
*/
struct itemdef {
const char *name; /* name of the item */
char *value; /* value given, or NULL if no value */
};
/*
* This list *must* be sorted by the "name" member.
* It doesn't hurt that there are extra entries here
* that are not known by the system this is running
* on. Missing entries here gives a nasty message to
* new bbs users.
*/
#define NUMDEFS (sizeof(def_table)/sizeof(def_table[0]))
static struct itemdef def_table[] = {
{ "ALLOW_MBSE", NULL },
{ "ASK_NEWUSER", NULL },
{ "DEFAULT_HOME", NULL },
{ "ENV_HZ", NULL },
{ "ENV_PATH" , NULL },
{ "ENV_TZ", NULL },
{ "ERASECHAR", NULL },
{ "FAIL_DELAY", NULL },
{ "ISSUE_FILE", NULL },
{ "KILLCHAR", NULL },
{ "LASTLOG_ENAB", NULL },
{ "LOGIN_RETRIES", NULL },
{ "LOGIN_TIMEOUT", NULL },
{ "LOG_OK_LOGINS", NULL },
{ "LOG_UNKFAIL_ENAB", NULL },
{ "MD5_CRYPT_ENAB", NULL },
{ "NEWUSER_ACCOUNT", NULL },
{ "NOLOGINS_FILE", NULL },
{ "TTYGROUP", NULL },
{ "TTYPERM", NULL },
{ "ULIMIT", NULL },
{ "UMASK", NULL },
{ "USERGROUPS_ENAB", NULL },
};
static int def_loaded = 0; /* are defs already loaded? */
/* local function prototypes */
static struct itemdef *def_find (const char *);
/*
* getdef_str - get string value from table of definitions.
*
* Return point to static data for specified item, or NULL if item is not
* defined. First time invoked, will load definitions from the file.
*/
char *getdef_str(const char *item)
{
struct itemdef *d;
if (!def_loaded)
def_load();
return ((d = def_find(item)) == NULL ? (char *)NULL : d->value);
}
/*
* getdef_bool - get boolean value from table of definitions.
*
* Return TRUE if specified item is defined as "yes", else FALSE.
*/
int getdef_bool(const char *item)
{
struct itemdef *d;
if (!def_loaded)
def_load();
if ((d = def_find(item)) == NULL || d->value == NULL)
return 0;
return (strcmp(d->value, "yes") == 0);
}
/*
* getdef_num - get numerical value from table of definitions
*
* Returns numeric value of specified item, else the "dflt" value if
* the item is not defined. Octal (leading "0") and hex (leading "0x")
* values are handled.
*/
int getdef_num(const char *item, int dflt)
{
struct itemdef *d;
if (!def_loaded)
def_load();
if ((d = def_find(item)) == NULL || d->value == NULL)
return dflt;
return (int) strtol(d->value, (char **)NULL, 0);
}
/*
* getdef_long - get long integer value from table of definitions
*
* Returns numeric value of specified item, else the "dflt" value if
* the item is not defined. Octal (leading "0") and hex (leading "0x")
* values are handled.
*/
long getdef_long(const char *item, long dflt)
{
struct itemdef *d;
if (!def_loaded)
def_load();
if ((d = def_find(item)) == NULL || d->value == NULL)
return dflt;
return strtol(d->value, (char **)NULL, 0);
}
/*
* def_find - locate named item in table
*
* Search through a sorted table of configurable items to locate the
* specified configuration option.
*/
static struct itemdef *def_find(const char *name)
{
int min, max, curr, n;
/*
* Invariant - desired item in range [min:max].
*/
min = 0;
max = NUMDEFS-1;
/*
* Binary search into the table. Relies on the items being
* sorted by name.
*/
while (min <= max) {
curr = (min+max)/2;
if (! (n = strcmp(def_table[curr].name, name)))
return &def_table[curr];
if (n < 0)
min = curr+1;
else
max = curr-1;
}
/*
* Item was never found.
*/
fprintf(stderr, "getdef(): configuration error - unknown item '%s' (notify administrator)\r\n", name);
syslog(LOG_CRIT, "getdef(): unknown configuration item `%s'", name);
return (struct itemdef *) NULL;
}
/*
* def_load - load configuration table
*
* Loads the user-configured options from the default configuration file
*/
void def_load(void)
{
int i;
FILE *fp;
struct itemdef *d;
char buf[BUFSIZ], def_fname[PATH_MAX], *name, *value, *s;
struct passwd *pw;
/*
* Get MBSE BBS root directory
*/
if ((pw = getpwnam("mbse")) == NULL) {
syslog(LOG_CRIT, "cannot find user `mbse' in password file");
return;
}
snprintf(def_fname, PATH_MAX, "%s/etc/login.defs", pw->pw_dir);
/*
* Open the configuration definitions file.
*/
if ((fp = fopen(def_fname, "r")) == NULL) {
syslog(LOG_CRIT, "cannot open login definitions %s [%m]", def_fname);
return;
}
/*
* Go through all of the lines in the file.
*/
while (fgets(buf, sizeof(buf), fp) != NULL) {
/*
* Trim trailing whitespace.
*/
for (i = strlen(buf)-1 ; i >= 0 ; --i) {
if (!isspace(buf[i]))
break;
}
buf[++i] = '\0';
/*
* Break the line into two fields.
*/
name = buf + strspn(buf, " \t"); /* first nonwhite */
if (*name == '\0' || *name == '#')
continue; /* comment or empty */
s = name + strcspn(name, " \t"); /* end of field */
if (*s == '\0')
continue; /* only 1 field?? */
*s++ = '\0';
value = s + strspn(s, " \"\t"); /* next nonwhite */
*(value + strcspn(value, "\"")) = '\0';
/*
* Locate the slot to save the value. If this parameter
* is unknown then "def_find" will print an err message.
*/
if ((d = def_find(name)) == NULL)
continue;
/*
* Save off the value.
*/
if ((d->value = strdup(value)) == NULL) {
fprintf(stderr, "getdef: Could not allocate space for config info.\n");
syslog(LOG_ERR, "getdef: could not allocate space for config info");
break;
}
}
(void) fclose(fp);
/*
* Set the initialized flag.
*/
++def_loaded;
}
#ifdef CKDEFS
int main(int argc, char **argv)
{
int i;
char *cp;
struct itemdef *d;
def_load ();
for (i = 0 ; i < NUMDEFS ; ++i) {
if ((d = def_find(def_table[i].name)) == NULL)
printf("error - lookup '%s' failed\n", def_table[i].name);
else
printf("%4d %-24s %s\n", i+1, d->name, d->value);
}
for (i = 1;i < argc;i++) {
if (cp = getdef_str (argv[1]))
printf ("%s `%s'\n", argv[1], cp);
else
printf ("%s not found\n", argv[1]);
}
exit(0);
}
#endif