441 lines
11 KiB
C
441 lines
11 KiB
C
/* $NetBSD: gen.c,v 1.3 2002/06/20 11:43:04 itojun Exp $ */
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/*
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* Copyright (c) 1996-1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#if !defined(LINT) && !defined(CODECENTER)
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static const char rcsid[] = "Id: gen.c,v 1.26 2001/05/29 05:48:35 marka Exp";
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#endif
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/*
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* this is the top level dispatcher
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*
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* The dispatcher is implemented as an accessor class; it is an
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* accessor class that calls other accessor classes, as controlled by a
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* configuration file.
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*
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* A big difference between this accessor class and others is that the
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* map class initializers are NULL, and the map classes are already
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* filled in with method functions that will do the right thing.
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*/
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/* Imports */
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#include "port_before.h"
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#include <isc/assertions.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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#include <isc/memcluster.h>
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#include <irs.h>
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#include "port_after.h"
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#include "irs_p.h"
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#include "gen_p.h"
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/* Definitions */
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struct nameval {
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const char * name;
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int val;
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};
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static const struct nameval acc_names[irs_nacc+1] = {
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{ "local", irs_lcl },
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{ "dns", irs_dns },
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{ "nis", irs_nis },
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{ "irp", irs_irp },
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{ NULL, irs_nacc }
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};
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typedef struct irs_acc *(*accinit) __P((const char *options));
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static const accinit accs[irs_nacc+1] = {
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irs_lcl_acc,
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irs_dns_acc,
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#ifdef WANT_IRS_NIS
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irs_nis_acc,
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#else
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NULL,
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#endif
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irs_irp_acc,
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NULL
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};
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static const struct nameval map_names[irs_nmap+1] = {
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{ "group", irs_gr },
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{ "passwd", irs_pw },
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{ "services", irs_sv },
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{ "protocols", irs_pr },
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{ "hosts", irs_ho },
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{ "networks", irs_nw },
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{ "netgroup", irs_ng },
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{ NULL, irs_nmap }
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};
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static const struct nameval option_names[] = {
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{ "merge", IRS_MERGE },
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{ "continue", IRS_CONTINUE },
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{ NULL, 0 }
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};
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/* Forward */
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static void gen_close(struct irs_acc *);
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static struct __res_state * gen_res_get(struct irs_acc *);
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static void gen_res_set(struct irs_acc *, struct __res_state *,
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void (*)(void *));
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static int find_name(const char *, const struct nameval nv[]);
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static void init_map_rules(struct gen_p *, const char *conf_file);
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static struct irs_rule *release_rule(struct irs_rule *);
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static int add_rule(struct gen_p *,
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enum irs_map_id, enum irs_acc_id,
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const char *);
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/* Public */
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struct irs_acc *
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irs_gen_acc(const char *options, const char *conf_file) {
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struct irs_acc *acc;
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struct gen_p *irs;
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if (!(acc = memget(sizeof *acc))) {
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errno = ENOMEM;
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return (NULL);
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}
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memset(acc, 0x5e, sizeof *acc);
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if (!(irs = memget(sizeof *irs))) {
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errno = ENOMEM;
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memput(acc, sizeof *acc);
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return (NULL);
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}
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memset(irs, 0x5e, sizeof *irs);
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irs->options = strdup(options);
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irs->res = NULL;
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irs->free_res = NULL;
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memset(irs->accessors, 0, sizeof irs->accessors);
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memset(irs->map_rules, 0, sizeof irs->map_rules);
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init_map_rules(irs, conf_file);
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acc->private = irs;
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#ifdef WANT_IRS_GR
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acc->gr_map = irs_gen_gr;
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#else
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acc->gr_map = NULL;
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#endif
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#ifdef WANT_IRS_PW
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acc->pw_map = irs_gen_pw;
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#else
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acc->pw_map = NULL;
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#endif
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acc->sv_map = irs_gen_sv;
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acc->pr_map = irs_gen_pr;
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acc->ho_map = irs_gen_ho;
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acc->nw_map = irs_gen_nw;
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acc->ng_map = irs_gen_ng;
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acc->res_get = gen_res_get;
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acc->res_set = gen_res_set;
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acc->close = gen_close;
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return (acc);
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}
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/* Methods */
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static struct __res_state *
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gen_res_get(struct irs_acc *this) {
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struct gen_p *irs = (struct gen_p *)this->private;
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if (irs->res == NULL) {
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struct __res_state *res;
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res = (struct __res_state *)malloc(sizeof *res);
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if (res == NULL)
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return (NULL);
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memset(res, 0, sizeof *res);
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gen_res_set(this, res, free);
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}
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if (((irs->res->options & RES_INIT) == 0) && res_ninit(irs->res) < 0)
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return (NULL);
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return (irs->res);
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}
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static void
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gen_res_set(struct irs_acc *this, struct __res_state *res,
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void (*free_res)(void *)) {
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struct gen_p *irs = (struct gen_p *)this->private;
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#if 0
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struct irs_rule *rule;
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struct irs_ho *ho;
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struct irs_nw *nw;
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#endif
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if (irs->res && irs->free_res) {
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res_nclose(irs->res);
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(*irs->free_res)(irs->res);
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}
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irs->res = res;
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irs->free_res = free_res;
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#if 0
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for (rule = irs->map_rules[irs_ho]; rule; rule = rule->next) {
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ho = rule->inst->ho;
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(*ho->res_set)(ho, res, NULL);
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}
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for (rule = irs->map_rules[irs_nw]; rule; rule = rule->next) {
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nw = rule->inst->nw;
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(*nw->res_set)(nw, res, NULL);
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}
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#endif
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}
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static void
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gen_close(struct irs_acc *this) {
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struct gen_p *irs = (struct gen_p *)this->private;
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int n;
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/* Search rules. */
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for (n = 0; n < irs_nmap; n++)
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while (irs->map_rules[n] != NULL)
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irs->map_rules[n] = release_rule(irs->map_rules[n]);
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/* Access methods. */
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for (n = 0; n < irs_nacc; n++) {
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/* Map objects. */
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if (irs->accessors[n].gr != NULL)
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(*irs->accessors[n].gr->close)(irs->accessors[n].gr);
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if (irs->accessors[n].pw != NULL)
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(*irs->accessors[n].pw->close)(irs->accessors[n].pw);
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if (irs->accessors[n].sv != NULL)
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(*irs->accessors[n].sv->close)(irs->accessors[n].sv);
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if (irs->accessors[n].pr != NULL)
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(*irs->accessors[n].pr->close)(irs->accessors[n].pr);
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if (irs->accessors[n].ho != NULL)
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(*irs->accessors[n].ho->close)(irs->accessors[n].ho);
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if (irs->accessors[n].nw != NULL)
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(*irs->accessors[n].nw->close)(irs->accessors[n].nw);
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if (irs->accessors[n].ng != NULL)
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(*irs->accessors[n].ng->close)(irs->accessors[n].ng);
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/* Enclosing accessor. */
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if (irs->accessors[n].acc != NULL)
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(*irs->accessors[n].acc->close)(irs->accessors[n].acc);
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}
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/* The options string was strdup'd. */
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free((void*)irs->options);
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if (irs->res && irs->free_res)
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(*irs->free_res)(irs->res);
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/* The private data container. */
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memput(irs, sizeof *irs);
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/* The object. */
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memput(this, sizeof *this);
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}
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/* Private */
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static int
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find_name(const char *name, const struct nameval names[]) {
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int n;
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for (n = 0; names[n].name != NULL; n++)
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if (strcmp(name, names[n].name) == 0)
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return (names[n].val);
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return (-1);
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}
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static struct irs_rule *
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release_rule(struct irs_rule *rule) {
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struct irs_rule *next = rule->next;
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memput(rule, sizeof *rule);
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return (next);
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}
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static int
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add_rule(struct gen_p *irs,
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enum irs_map_id map, enum irs_acc_id acc,
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const char *options)
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{
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struct irs_rule **rules, *last, *tmp, *new;
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struct irs_inst *inst;
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const char *cp;
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int n;
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#ifndef WANT_IRS_GR
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if (map == irs_gr)
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return (-1);
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#endif
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#ifndef WANT_IRS_PW
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if (map == irs_pw)
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return (-1);
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#endif
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#ifndef WANT_IRS_NIS
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if (acc == irs_nis)
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return (-1);
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#endif
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new = memget(sizeof *new);
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if (new == NULL)
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return (-1);
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memset(new, 0x5e, sizeof *new);
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new->next = NULL;
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new->inst = &irs->accessors[acc];
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new->flags = 0;
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cp = options;
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while (cp && *cp) {
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char option[50], *next;
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next = strchr(cp, ',');
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if (next)
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n = next++ - cp;
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else
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n = strlen(cp);
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if ((size_t)n > sizeof option - 1)
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n = sizeof option - 1;
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strncpy(option, cp, n);
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option[n] = '\0';
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n = find_name(option, option_names);
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if (n >= 0)
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new->flags |= n;
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cp = next;
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}
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rules = &irs->map_rules[map];
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for (last = NULL, tmp = *rules;
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tmp != NULL;
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last = tmp, tmp = tmp->next)
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(void)NULL;
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if (last == NULL)
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*rules = new;
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else
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last->next = new;
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/* Try to instantiate map accessors for this if necessary & approp. */
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inst = &irs->accessors[acc];
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if (inst->acc == NULL && accs[acc] != NULL)
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inst->acc = (*accs[acc])(irs->options);
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if (inst->acc != NULL) {
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if (inst->gr == NULL && inst->acc->gr_map != NULL)
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inst->gr = (*inst->acc->gr_map)(inst->acc);
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if (inst->pw == NULL && inst->acc->pw_map != NULL)
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inst->pw = (*inst->acc->pw_map)(inst->acc);
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if (inst->sv == NULL && inst->acc->sv_map != NULL)
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inst->sv = (*inst->acc->sv_map)(inst->acc);
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if (inst->pr == NULL && inst->acc->pr_map != NULL)
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inst->pr = (*inst->acc->pr_map)(inst->acc);
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if (inst->ho == NULL && inst->acc->ho_map != NULL)
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inst->ho = (*inst->acc->ho_map)(inst->acc);
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if (inst->nw == NULL && inst->acc->nw_map != NULL)
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inst->nw = (*inst->acc->nw_map)(inst->acc);
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if (inst->ng == NULL && inst->acc->ng_map != NULL)
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inst->ng = (*inst->acc->ng_map)(inst->acc);
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}
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return (0);
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}
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static void
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default_map_rules(struct gen_p *irs) {
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/* Install time honoured and proved BSD style rules as default. */
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add_rule(irs, irs_gr, irs_lcl, "");
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add_rule(irs, irs_pw, irs_lcl, "");
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add_rule(irs, irs_sv, irs_lcl, "");
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add_rule(irs, irs_pr, irs_lcl, "");
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add_rule(irs, irs_ho, irs_dns, "continue");
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add_rule(irs, irs_ho, irs_lcl, "");
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add_rule(irs, irs_nw, irs_dns, "continue");
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add_rule(irs, irs_nw, irs_lcl, "");
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add_rule(irs, irs_ng, irs_lcl, "");
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}
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static void
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init_map_rules(struct gen_p *irs, const char *conf_file) {
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#ifdef __NetBSD__
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/*
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* We don't read irs.conf here. It adds too much complexity to
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* the complex situation with "BIND4 in libc" + "BIND8 in userland"
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*/
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default_map_rules(irs);
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#else
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char line[1024], pattern[40], mapname[20], accname[20], options[100];
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FILE *conf;
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if (conf_file == NULL)
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conf_file = _PATH_IRS_CONF ;
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/* A conf file of "" means compiled in defaults. Irpd wants this */
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if (conf_file[0] == '\0' || (conf = fopen(conf_file, "r")) == NULL) {
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default_map_rules(irs);
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return;
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}
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(void) sprintf(pattern, "%%%ds %%%ds %%%ds\n",
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sizeof mapname, sizeof accname, sizeof options);
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while (fgets(line, sizeof line, conf)) {
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enum irs_map_id map;
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enum irs_acc_id acc;
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char *tmp;
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int n;
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for (tmp = line;
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isascii((unsigned char)*tmp) &&
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isspace((unsigned char)*tmp);
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tmp++)
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(void)NULL;
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if (*tmp == '#' || *tmp == '\n' || *tmp == '\0')
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continue;
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n = sscanf(tmp, pattern, mapname, accname, options);
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if (n < 2)
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continue;
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if (n < 3)
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options[0] = '\0';
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n = find_name(mapname, map_names);
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INSIST(n < irs_nmap);
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if (n < 0)
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continue;
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map = (enum irs_map_id) n;
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n = find_name(accname, acc_names);
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INSIST(n < irs_nacc);
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if (n < 0)
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continue;
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acc = (enum irs_acc_id) n;
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add_rule(irs, map, acc, options);
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}
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fclose(conf);
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#endif
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}
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