/* $NetBSD: nsdispatch.c,v 1.9 1999/01/25 00:16:17 lukem Exp $ */
/*-
* Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Luke Mewburn.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <fcntl.h>
#define _NS_PRIVATE
#include <nsswitch.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/*
* default sourcelist: `files'
*/
const ns_src __nsdefaultsrc[] = {
{ NSSRC_FILES, NS_SUCCESS },
{ 0 },
};
static int _nsmapsize = 0;
static ns_dbt *_nsmap = NULL;
/*
* size of dynamic array chunk for _nsmap and _nsmap[x].srclist
*/
#define NSELEMSPERCHUNK 8
int _nscmp(const void *, const void *);
int
_nscmp(a, b)
const void *a;
const void *b;
{
return (strcasecmp(((const ns_dbt *)a)->name,
((const ns_dbt *)b)->name));
}
void
_nsdbtaddsrc(dbt, src)
ns_dbt *dbt;
const ns_src *src;
{
if ((dbt->srclistsize % NSELEMSPERCHUNK) == 0) {
dbt->srclist = (ns_src *)realloc(dbt->srclist,
(dbt->srclistsize + NSELEMSPERCHUNK) * sizeof(ns_src));
if (dbt->srclist == NULL)
printf("nsdispatch: memory allocation failure\n");
}
memmove(&dbt->srclist[dbt->srclistsize++], src, sizeof(ns_src));
}
void
_nsdbtdump(dbt)
const ns_dbt *dbt;
{
int i;
printf("%s (%d source%s):", dbt->name, dbt->srclistsize,
dbt->srclistsize == 1 ? "" : "s");
for (i = 0; i < dbt->srclistsize; i++) {
printf(" %s", dbt->srclist[i].name);
if (!(dbt->srclist[i].flags &
(NS_UNAVAIL|NS_NOTFOUND|NS_TRYAGAIN)) &&
(dbt->srclist[i].flags & NS_SUCCESS))
continue;
printf(" [");
if (!(dbt->srclist[i].flags & NS_SUCCESS))
printf(" SUCCESS=continue");
if (dbt->srclist[i].flags & NS_UNAVAIL)
printf(" UNAVAIL=return");
if (dbt->srclist[i].flags & NS_NOTFOUND)
printf(" NOTFOUND=return");
if (dbt->srclist[i].flags & NS_TRYAGAIN)
printf(" TRYAGAIN=return");
printf(" ]");
}
printf("\n");
}
const ns_dbt *
_nsdbtget(name)
const char *name;
{
static time_t confmod;
struct stat statbuf;
ns_dbt dbt;
extern FILE *_nsyyin;
extern int _nsyyparse(void);
dbt.name = name;
if (confmod) {
if (stat(_PATH_NS_CONF, &statbuf) == -1)
return (NULL);
if (confmod < statbuf.st_mtime) {
int i, j;
for (i = 0; i < _nsmapsize; i++) {
for (j = 0; j < _nsmap[i].srclistsize; j++) {
if (_nsmap[i].srclist[j].name != NULL) {
/*LINTED const cast*/
free((void *)
_nsmap[i].srclist[j].name);
}
}
if (_nsmap[i].srclist)
free(_nsmap[i].srclist);
if (_nsmap[i].name) {
/*LINTED const cast*/
free((void *)_nsmap[i].name);
}
}
if (_nsmap)
free(_nsmap);
_nsmap = NULL;
_nsmapsize = 0;
confmod = 0;
}
}
if (!confmod) {
if (stat(_PATH_NS_CONF, &statbuf) == -1)
return (NULL);
_nsyyin = fopen(_PATH_NS_CONF, "r");
if (_nsyyin == NULL)
return (NULL);
_nsyyparse();
(void)fclose(_nsyyin);
qsort(_nsmap, (size_t)_nsmapsize, sizeof(ns_dbt), _nscmp);
confmod = statbuf.st_mtime;
}
return (bsearch(&dbt, _nsmap, (size_t)_nsmapsize, sizeof(ns_dbt),
_nscmp));
}
void
_nsdbtput(dbt)
const ns_dbt *dbt;
{
int i;
for (i = 0; i < _nsmapsize; i++) {
if (_nscmp(dbt, &_nsmap[i]) == 0) {
/* overwrite existing entry */
if (_nsmap[i].srclist != NULL)
free(_nsmap[i].srclist);
memmove(&_nsmap[i], dbt, sizeof(ns_dbt));
return;
}
}
if ((_nsmapsize % NSELEMSPERCHUNK) == 0) {
_nsmap = (ns_dbt *)realloc(_nsmap,
(_nsmapsize + NSELEMSPERCHUNK) * sizeof(ns_dbt));
if (_nsmap == NULL)
printf("nsdispatch: memory allocation failure\n");
}
memmove(&_nsmap[_nsmapsize++], dbt, sizeof(ns_dbt));
}
int
#if __STDC__
nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database,
const char *method, const ns_src defaults[], ...)
#else
nsdispatch(retval, disp_tab, database, method, defaults, va_alist)
void *retval;
const ns_dtab disp_tab[];
const char *database;
const char *method;
const ns_src defaults[];
va_dcl
#endif
{
va_list ap;
int i, curdisp, result;
const ns_dbt *dbt;
const ns_src *srclist;
int srclistsize;
dbt = _nsdbtget(database);
if (dbt != NULL) {
srclist = dbt->srclist;
srclistsize = dbt->srclistsize;
} else {
srclist = defaults;
srclistsize = 0;
while (srclist[srclistsize].name != NULL)
srclistsize++;
}
result = 0;
for (i = 0; i < srclistsize; i++) {
for (curdisp = 0; disp_tab[curdisp].src != NULL; curdisp++)
if (strcasecmp(disp_tab[curdisp].src,
srclist[i].name) == 0)
break;
result = 0;
if (disp_tab[curdisp].callback) {
#if __STDC__
va_start(ap, defaults);
#else
va_start(ap);
#endif
result = disp_tab[curdisp].callback(retval,
disp_tab[curdisp].cb_data, ap);
va_end(ap);
if (result & srclist[i].flags) {
break;
}
}
}
return (result ? result : NS_NOTFOUND);
}