dns_gr.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 1996-1999 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$Id: dns_gr.c,v 1.21 2002/07/08 06:26:09 marka Exp $";
#endif
/*
* dns_gr.c --- this file contains the functions for accessing
* group information from Hesiod.
*/
#include "port_before.h"
#ifndef WANT_IRS_GR
static int __bind_irs_gr_unneeded;
#else
#include <sys/param.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <isc/memcluster.h>
#include <irs.h>
#include "port_after.h"
#include "irs_p.h"
#include "hesiod.h"
#include "dns_p.h"
/* Types. */
struct pvt {
/*
* This is our private accessor data. It has a shared hesiod context.
*/
struct dns_p * dns;
/*
* Need space to store the entries read from the group file.
* The members list also needs space per member, and the
* strings making up the user names must be allocated
* somewhere. Rather than doing lots of small allocations,
* we keep one buffer and resize it as needed.
*/
struct group group;
size_t nmemb; /* Malloc'd max index of gr_mem[]. */
char * membuf;
size_t membufsize;
};
/* Forward. */
static struct group * gr_next(struct irs_gr *);
static struct group * gr_byname(struct irs_gr *, const char *);
static struct group * gr_bygid(struct irs_gr *, gid_t);
static void gr_rewind(struct irs_gr *);
static void gr_close(struct irs_gr *);
static int gr_list(struct irs_gr *, const char *,
gid_t, gid_t *, int *);
static void gr_minimize(struct irs_gr *);
static struct __res_state * gr_res_get(struct irs_gr *);
static void gr_res_set(struct irs_gr *,
struct __res_state *,
void (*)(void *));
static struct group * get_hes_group(struct irs_gr *this,
const char *name,
const char *type);
/* Public. */
struct irs_gr *
irs_dns_gr(struct irs_acc *this) {
struct dns_p *dns = (struct dns_p *)this->private;
struct irs_gr *gr;
struct pvt *pvt;
if (!dns || !dns->hes_ctx) {
errno = ENODEV;
return (NULL);
}
if (!(pvt = memget(sizeof *pvt))) {
errno = ENOMEM;
return (NULL);
}
memset(pvt, 0, sizeof *pvt);
pvt->dns = dns;
if (!(gr = memget(sizeof *gr))) {
memput(pvt, sizeof *pvt);
errno = ENOMEM;
return (NULL);
}
memset(gr, 0x5e, sizeof *gr);
gr->private = pvt;
gr->next = gr_next;
gr->byname = gr_byname;
gr->bygid = gr_bygid;
gr->rewind = gr_rewind;
gr->close = gr_close;
gr->list = gr_list;
gr->minimize = gr_minimize;
gr->res_get = gr_res_get;
gr->res_set = gr_res_set;
return (gr);
}
/* methods */
static void
gr_close(struct irs_gr *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (pvt->group.gr_mem)
free(pvt->group.gr_mem);
if (pvt->membuf)
free(pvt->membuf);
memput(pvt, sizeof *pvt);
memput(this, sizeof *this);
}
static struct group *
gr_next(struct irs_gr *this) {
UNUSED(this);
return (NULL);
}
static struct group *
gr_byname(struct irs_gr *this, const char *name) {
return (get_hes_group(this, name, "group"));
}
static struct group *
gr_bygid(struct irs_gr *this, gid_t gid) {
char name[32];
sprintf(name, "%ld", (long)gid);
return (get_hes_group(this, name, "gid"));
}
static void
gr_rewind(struct irs_gr *this) {
UNUSED(this);
/* NOOP */
}
static int
gr_list(struct irs_gr *this, const char *name,
gid_t basegid, gid_t *groups, int *ngroups)
{
UNUSED(this);
UNUSED(name);
UNUSED(basegid);
UNUSED(groups);
*ngroups = 0;
/* There's some way to do this in Hesiod. */
return (-1);
}
static void
gr_minimize(struct irs_gr *this) {
UNUSED(this);
/* NOOP */
}
/* Private. */
static struct group *
get_hes_group(struct irs_gr *this, const char *name, const char *type) {
struct pvt *pvt = (struct pvt *)this->private;
char **hes_list, *cp, **new;
size_t num_members = 0;
u_long t;
hes_list = hesiod_resolve(pvt->dns->hes_ctx, name, type);
if (!hes_list)
return (NULL);
/*
* Copy the returned hesiod string into storage space.
*/
if (pvt->membuf)
free(pvt->membuf);
pvt->membuf = strdup(*hes_list);
hesiod_free_list(pvt->dns->hes_ctx, hes_list);
cp = pvt->membuf;
pvt->group.gr_name = cp;
if (!(cp = strchr(cp, ':')))
goto cleanup;
*cp++ = '\0';
pvt->group.gr_passwd = cp;
if (!(cp = strchr(cp, ':')))
goto cleanup;
*cp++ = '\0';
errno = 0;
t = strtoul(cp, NULL, 10);
if (errno == ERANGE)
goto cleanup;
pvt->group.gr_gid = (gid_t) t;
if (!(cp = strchr(cp, ':')))
goto cleanup;
cp++;
/*
* Parse the members out.
*/
while (*cp) {
if (num_members+1 >= pvt->nmemb || pvt->group.gr_mem == NULL) {
pvt->nmemb += 10;
new = realloc(pvt->group.gr_mem,
pvt->nmemb * sizeof(char *));
if (new == NULL)
goto cleanup;
pvt->group.gr_mem = new;
}
pvt->group.gr_mem[num_members++] = cp;
if (!(cp = strchr(cp, ',')))
break;
*cp++ = '\0';
}
if (!pvt->group.gr_mem) {
pvt->group.gr_mem = malloc(sizeof(char*));
if (!pvt->group.gr_mem)
goto cleanup;
}
pvt->group.gr_mem[num_members] = NULL;
return (&pvt->group);
cleanup:
if (pvt->group.gr_mem) {
free(pvt->group.gr_mem);
pvt->group.gr_mem = NULL;
}
if (pvt->membuf) {
free(pvt->membuf);
pvt->membuf = NULL;
}
return (NULL);
}
static struct __res_state *
gr_res_get(struct irs_gr *this) {
struct pvt *pvt = (struct pvt *)this->private;
struct dns_p *dns = pvt->dns;
return (__hesiod_res_get(dns->hes_ctx));
}
static void
gr_res_set(struct irs_gr *this, struct __res_state * res,
void (*free_res)(void *)) {
struct pvt *pvt = (struct pvt *)this->private;
struct dns_p *dns = pvt->dns;
__hesiod_res_set(dns->hes_ctx, res, free_res);
}
#endif /* WANT_IRS_GR */