/*      $NetBSD: nis_ng.c,v 1.1.1.2 2012/09/09 16:07:58 christos Exp $  */

/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* 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 ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "Id: nis_ng.c,v 1.4 2005/04/27 04:56:32 sra Exp ";
#endif

/* Imports */

#include "port_before.h"

#ifndef WANT_IRS_NIS
static int __bind_irs_nis_unneeded;
#else

#include <sys/types.h>
#include <netinet/in.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>

#include <isc/assertions.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <netinet/in.h>
#ifdef T_NULL
#undef T_NULL                   /* Silence re-definition warning of T_NULL. */
#endif
#include <arpa/nameser.h>
#include <resolv.h>

#include <isc/memcluster.h>
#include <irs.h>

#include "port_after.h"

#include "irs_p.h"
#include "nis_p.h"

/* Definitions */

struct tmpgrp {
       const char *    name;
       const char *    host;
       const char *    user;
       const char *    domain;
       struct tmpgrp * next;
};

struct pvt {
       char *          nis_domain;
       struct tmpgrp * tmp;
       struct tmpgrp * cur;
       char *          tmpgroup;
};

enum do_what { do_none = 0x0, do_key = 0x1, do_val = 0x2, do_all = 0x3 };

static /*const*/ char netgroup_map[]    = "netgroup";

/* Forward */

static void             ng_close(struct irs_ng *);
static int              ng_next(struct irs_ng *, const char **,
                               const char **, const char **);
static int              ng_test(struct irs_ng *,
                               const char *, const char *,
                               const char *, const char *);
static void             ng_rewind(struct irs_ng *, const char *);
static void             ng_minimize(struct irs_ng *);

static void             add_group_to_list(struct pvt *, const char *, int);
static void             add_tuple_to_list(struct pvt *, const char *, char *);
static void             tmpfree(struct pvt *);

/* Public */

struct irs_ng *
irs_nis_ng(struct irs_acc *this) {
       struct irs_ng *ng;
       struct pvt *pvt;

       if (!(ng = memget(sizeof *ng))) {
               errno = ENOMEM;
               return (NULL);
       }
       memset(ng, 0x5e, sizeof *ng);
       if (!(pvt = memget(sizeof *pvt))) {
               memput(ng, sizeof *ng);
               errno = ENOMEM;
               return (NULL);
       }
       memset(pvt, 0, sizeof *pvt);
       pvt->nis_domain = ((struct nis_p *)this->private)->domain;
       ng->private = pvt;
       ng->close = ng_close;
       ng->next = ng_next;
       ng->test = ng_test;
       ng->rewind = ng_rewind;
       ng->minimize = ng_minimize;
       return (ng);
}

/* Methods */

static void
ng_close(struct irs_ng *this) {
       struct pvt *pvt = (struct pvt *)this->private;

       tmpfree(pvt);
       memput(pvt, sizeof *pvt);
       memput(this, sizeof *this);
}

static int
ng_next(struct irs_ng *this, const char **host, const char **user, const char **domain) {
       struct pvt *pvt = (struct pvt *)this->private;

       if (!pvt->cur)
               return (0);
       *host = pvt->cur->host;
       *user = pvt->cur->user;
       *domain = pvt->cur->domain;
       pvt->cur = pvt->cur->next;
       return (1);
}

static int
ng_test(struct irs_ng *this, const char *name,
       const char *host, const char *user, const char *domain)
{
       struct pvt *pvt = (struct pvt *)this->private;
       struct tmpgrp *cur;

       tmpfree(pvt);
       add_group_to_list(pvt, name, strlen(name));
       for (cur = pvt->tmp; cur; cur = cur->next) {
               if ((!host || !cur->host || !strcmp(host, cur->host)) &&
                   (!user || !cur->user || !strcmp(user, cur->user)) &&
                   (!domain || !cur->domain || !strcmp(domain, cur->domain)))
                       break;
       }
       tmpfree(pvt);
       return ((cur == NULL) ? 0 : 1);
}

static void
ng_rewind(struct irs_ng *this, const char *name) {
       struct pvt *pvt = (struct pvt *)this->private;

       /* Either hand back or free the existing list. */
       if (pvt->tmpgroup) {
               if (pvt->tmp && !strcmp(pvt->tmpgroup, name))
                       goto reset;
               tmpfree(pvt);
       }
       pvt->tmpgroup = strdup(name);
       add_group_to_list(pvt, name, strlen(name));
reset:
       pvt->cur = pvt->tmp;
}

static void
ng_minimize(struct irs_ng *this) {
       UNUSED(this);
       /* NOOP */
}

/* Private */

static void
add_group_to_list(struct pvt *pvt, const char *name, int len) {
       char *vdata, *cp, *np;
       struct tmpgrp *tmp;
       int vlen, r;
       char *nametmp;

       /* Don't add the same group to the list more than once. */
       for (tmp = pvt->tmp; tmp; tmp = tmp->next)
               if (!strcmp(tmp->name, name))
                       return;

       DE_CONST(name, nametmp);
       r = yp_match(pvt->nis_domain, netgroup_map, nametmp, len,
                    &vdata, &vlen);
       if (r == 0) {
               cp = vdata;
               if (*cp && cp[strlen(cp)-1] == '\n')
                 cp[strlen(cp)-1] = '\0';
               for ( ; cp; cp = np) {
                       np = strchr(cp, ' ');
                       if (np)
                               *np++ = '\0';
                       if (*cp == '(')
                               add_tuple_to_list(pvt, name, cp);
                       else
                               add_group_to_list(pvt, cp, strlen(cp));
               }
               free(vdata);
       }
}

static void
add_tuple_to_list(struct pvt *pvt, const char *name, char *cp) {
       struct tmpgrp *tmp;
       char *tp, *np;

       INSIST(*cp++ == '(');

       tmp = malloc(sizeof *tmp + strlen(name) + sizeof '\0' +
                    strlen(cp) - sizeof ')');
       if (!tmp)
               return;
       memset(tmp, 0, sizeof *tmp);
       tp = ((char *)tmp) + sizeof *tmp;

       /* Name */
       strcpy(tp, name);
       tmp->name = tp;
       tp += strlen(tp) + 1;

       /* Host */
       if (!(np = strchr(cp, ',')))
               goto cleanup;
       *np++ = '\0';
       strcpy(tp, cp);
       tmp->host = tp;
       tp += strlen(tp) + 1;
       cp = np;

       /* User */
       if (!(np = strchr(cp, ',')))
               goto cleanup;
       *np++ = '\0';
       strcpy(tp, cp);
       tmp->user = tp;
       tp += strlen(tp) + 1;
       cp = np;

       /* Domain */
       if (!(np = strchr(cp, ')')))
               goto cleanup;
       *np++ = '\0';
       strcpy(tp, cp);
       tmp->domain = tp;

       /*
        * Empty string in file means wildcard, but
        * NULL string in return value means wildcard.
        */
       if (!*tmp->host)
               tmp->host = NULL;
       if (!*tmp->user)
               tmp->user = NULL;
       if (!*tmp->domain)
               tmp->domain = NULL;

       /* Add to list (LIFO). */
       tmp->next = pvt->tmp;
       pvt->tmp = tmp;
       return;

cleanup:
       free(tmp);
}

static void
tmpfree(struct pvt *pvt) {
       struct tmpgrp *cur, *next;

       if (pvt->tmpgroup) {
               free(pvt->tmpgroup);
               pvt->tmpgroup = NULL;
       }
       for (cur = pvt->tmp; cur; cur = next) {
               next = cur->next;
               free(cur);
       }
       pvt->tmp = NULL;
}

#endif /*WANT_IRS_NIS*/

/*! \file */

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