/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* 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(LINT) && !defined(CODECENTER)
static const char rcsid[] = "$Id: gen.c,v 1.7 2005/04/27 04:56:23 sra Exp $";
#endif
/*! \file
* \brief
* this is the top level dispatcher
*
* The dispatcher is implemented as an accessor class; it is an
* accessor class that calls other accessor classes, as controlled by a
* configuration file.
*
* A big difference between this accessor class and others is that the
* map class initializers are NULL, and the map classes are already
* filled in with method functions that will do the right thing.
*/
/* Imports */
#include "port_before.h"
#include <isc/assertions.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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 "gen_p.h"
#ifdef SUNW_HOSTS_FALLBACK
extern int __res_no_hosts_fallback(void);
#endif /* SUNW_HOSTS_FALLBACK */
/* Definitions */
struct nameval {
const char * name;
int val;
};
static const struct nameval acc_names[irs_nacc+1] = {
{ "local", irs_lcl },
{ "dns", irs_dns },
{ "nis", irs_nis },
{ "irp", irs_irp },
{ NULL, irs_nacc }
};
typedef struct irs_acc *(*accinit) __P((const char *options));
static const accinit accs[irs_nacc+1] = {
irs_lcl_acc,
irs_dns_acc,
#ifdef WANT_IRS_NIS
irs_nis_acc,
#else
NULL,
#endif
irs_irp_acc,
NULL
};
static const struct nameval map_names[irs_nmap+1] = {
{ "group", irs_gr },
{ "passwd", irs_pw },
{ "services", irs_sv },
{ "protocols", irs_pr },
{ "hosts", irs_ho },
{ "networks", irs_nw },
{ "netgroup", irs_ng },
{ NULL, irs_nmap }
};
static const struct nameval option_names[] = {
{ "merge", IRS_MERGE },
{ "continue", IRS_CONTINUE },
{ NULL, 0 }
};
/* Forward */
static void gen_close(struct irs_acc *);
static struct __res_state * gen_res_get(struct irs_acc *);
static void gen_res_set(struct irs_acc *, struct __res_state *,
void (*)(void *));
static int find_name(const char *, const struct nameval nv[]);
static void init_map_rules(struct gen_p *, const char *conf_file);
static struct irs_rule *release_rule(struct irs_rule *);
static int add_rule(struct gen_p *,
enum irs_map_id, enum irs_acc_id,
const char *);
/* Public */
struct irs_acc *
irs_gen_acc(const char *options, const char *conf_file) {
struct irs_acc *acc;
struct gen_p *irs;
if (!(acc = memget(sizeof *acc))) {
errno = ENOMEM;
return (NULL);
}
memset(acc, 0x5e, sizeof *acc);
if (!(irs = memget(sizeof *irs))) {
errno = ENOMEM;
memput(acc, sizeof *acc);
return (NULL);
}
memset(irs, 0x5e, sizeof *irs);
irs->options = strdup(options);
irs->res = NULL;
irs->free_res = NULL;
memset(irs->accessors, 0, sizeof irs->accessors);
memset(irs->map_rules, 0, sizeof irs->map_rules);
init_map_rules(irs, conf_file);
acc->private = irs;
#ifdef WANT_IRS_GR
acc->gr_map = irs_gen_gr;
#else
acc->gr_map = NULL;
#endif
#ifdef WANT_IRS_PW
acc->pw_map = irs_gen_pw;
#else
acc->pw_map = NULL;
#endif
acc->sv_map = irs_gen_sv;
acc->pr_map = irs_gen_pr;
acc->ho_map = irs_gen_ho;
acc->nw_map = irs_gen_nw;
acc->ng_map = irs_gen_ng;
acc->res_get = gen_res_get;
acc->res_set = gen_res_set;
acc->close = gen_close;
return (acc);
}
/* Methods */
static struct __res_state *
gen_res_get(struct irs_acc *this) {
struct gen_p *irs = (struct gen_p *)this->private;
if (irs->res == NULL) {
struct __res_state *res;
res = (struct __res_state *)malloc(sizeof *res);
if (res == NULL)
return (NULL);
memset(res, 0, sizeof *res);
gen_res_set(this, res, free);
}
if (((irs->res->options & RES_INIT) == 0U) && res_ninit(irs->res) < 0)
return (NULL);
return (irs->res);
}
static void
gen_res_set(struct irs_acc *this, struct __res_state *res,
void (*free_res)(void *)) {
struct gen_p *irs = (struct gen_p *)this->private;
#if 0
struct irs_rule *rule;
struct irs_ho *ho;
struct irs_nw *nw;
#endif
if (irs->res && irs->free_res) {
res_nclose(irs->res);
(*irs->free_res)(irs->res);
}
irs->res = res;
irs->free_res = free_res;
#if 0
for (rule = irs->map_rules[irs_ho]; rule; rule = rule->next) {
ho = rule->inst->ho;
(*ho->res_set)(ho, res, NULL);
}
for (rule = irs->map_rules[irs_nw]; rule; rule = rule->next) {
nw = rule->inst->nw;
(*nw->res_set)(nw, res, NULL);
}
#endif
}
static void
gen_close(struct irs_acc *this) {
struct gen_p *irs = (struct gen_p *)this->private;
int n;
/* Search rules. */
for (n = 0; n < irs_nmap; n++)
while (irs->map_rules[n] != NULL)
irs->map_rules[n] = release_rule(irs->map_rules[n]);
/* Access methods. */
for (n = 0; n < irs_nacc; n++) {
/* Map objects. */
if (irs->accessors[n].gr != NULL)
(*irs->accessors[n].gr->close)(irs->accessors[n].gr);
if (irs->accessors[n].pw != NULL)
(*irs->accessors[n].pw->close)(irs->accessors[n].pw);
if (irs->accessors[n].sv != NULL)
(*irs->accessors[n].sv->close)(irs->accessors[n].sv);
if (irs->accessors[n].pr != NULL)
(*irs->accessors[n].pr->close)(irs->accessors[n].pr);
if (irs->accessors[n].ho != NULL)
(*irs->accessors[n].ho->close)(irs->accessors[n].ho);
if (irs->accessors[n].nw != NULL)
(*irs->accessors[n].nw->close)(irs->accessors[n].nw);
if (irs->accessors[n].ng != NULL)
(*irs->accessors[n].ng->close)(irs->accessors[n].ng);
/* Enclosing accessor. */
if (irs->accessors[n].acc != NULL)
(*irs->accessors[n].acc->close)(irs->accessors[n].acc);
}
/* The options string was strdup'd. */
free((void*)irs->options);
if (irs->res && irs->free_res)
(*irs->free_res)(irs->res);
/* The private data container. */
memput(irs, sizeof *irs);
/* The object. */
memput(this, sizeof *this);
}
/* Private */
static int
find_name(const char *name, const struct nameval names[]) {
int n;
for (n = 0; names[n].name != NULL; n++)
if (strcmp(name, names[n].name) == 0)
return (names[n].val);
return (-1);
}
static struct irs_rule *
release_rule(struct irs_rule *rule) {
struct irs_rule *next = rule->next;
memput(rule, sizeof *rule);
return (next);
}
static int
add_rule(struct gen_p *irs,
enum irs_map_id map, enum irs_acc_id acc,
const char *options)
{
struct irs_rule **rules, *last, *tmp, *new;
struct irs_inst *inst;
const char *cp;
int n;
#ifndef WANT_IRS_GR
if (map == irs_gr)
return (-1);
#endif
#ifndef WANT_IRS_PW
if (map == irs_pw)
return (-1);
#endif
#ifndef WANT_IRS_NIS
if (acc == irs_nis)
return (-1);
#endif
new = memget(sizeof *new);
if (new == NULL)
return (-1);
memset(new, 0x5e, sizeof *new);
new->next = NULL;
new->inst = &irs->accessors[acc];
new->flags = 0;
cp = options;
while (cp && *cp) {
char option[50], *next;
next = strchr(cp, ',');
if (next)
n = next++ - cp;
else
n = strlen(cp);
if ((size_t)n > sizeof option - 1)
n = sizeof option - 1;
strncpy(option, cp, n);
option[n] = '\0';
n = find_name(option, option_names);
if (n >= 0)
new->flags |= n;
cp = next;
}
rules = &irs->map_rules[map];
for (last = NULL, tmp = *rules;
tmp != NULL;
last = tmp, tmp = tmp->next)
(void)NULL;
if (last == NULL)
*rules = new;
else
last->next = new;
/* Try to instantiate map accessors for this if necessary & approp. */
inst = &irs->accessors[acc];
if (inst->acc == NULL && accs[acc] != NULL)
inst->acc = (*accs[acc])(irs->options);
if (inst->acc != NULL) {
if (inst->gr == NULL && inst->acc->gr_map != NULL)
inst->gr = (*inst->acc->gr_map)(inst->acc);
if (inst->pw == NULL && inst->acc->pw_map != NULL)
inst->pw = (*inst->acc->pw_map)(inst->acc);
if (inst->sv == NULL && inst->acc->sv_map != NULL)
inst->sv = (*inst->acc->sv_map)(inst->acc);
if (inst->pr == NULL && inst->acc->pr_map != NULL)
inst->pr = (*inst->acc->pr_map)(inst->acc);
if (inst->ho == NULL && inst->acc->ho_map != NULL)
inst->ho = (*inst->acc->ho_map)(inst->acc);
if (inst->nw == NULL && inst->acc->nw_map != NULL)
inst->nw = (*inst->acc->nw_map)(inst->acc);
if (inst->ng == NULL && inst->acc->ng_map != NULL)
inst->ng = (*inst->acc->ng_map)(inst->acc);
}
return (0);
}
static void
default_map_rules(struct gen_p *irs) {
/* Install time honoured and proved BSD style rules as default. */
add_rule(irs, irs_gr, irs_lcl, "");
add_rule(irs, irs_pw, irs_lcl, "");
add_rule(irs, irs_sv, irs_lcl, "");
add_rule(irs, irs_pr, irs_lcl, "");
#ifdef SUNW_HOSTS_FALLBACK
if (__res_no_hosts_fallback())
add_rule(irs, irs_ho, irs_dns, "");
else {
add_rule(irs, irs_ho, irs_dns, "continue");
add_rule(irs, irs_ho, irs_lcl, "");
}
#else /* SUNW_HOSTS_FALLBACK */
add_rule(irs, irs_ho, irs_dns, "continue");
add_rule(irs, irs_ho, irs_lcl, "");
#endif /* SUNW_HOSTS_FALLBACK */
add_rule(irs, irs_nw, irs_dns, "continue");
add_rule(irs, irs_nw, irs_lcl, "");
add_rule(irs, irs_ng, irs_lcl, "");
}
static void
init_map_rules(struct gen_p *irs, const char *conf_file) {
char line[1024], pattern[40], mapname[20], accname[20], options[100];
FILE *conf;
#ifdef SUNW_HOSTS_FALLBACK
if (__res_no_hosts_fallback()) {
default_map_rules(irs);
return;
}
#endif /* SUNW_HOSTS_FALLBACK */
if (conf_file == NULL)
conf_file = _PATH_IRS_CONF ;
/* A conf file of "" means compiled in defaults. Irpd wants this */
if (conf_file[0] == '\0' || (conf = fopen(conf_file, "r")) == NULL) {
default_map_rules(irs);
return;
}
(void) sprintf(pattern, "%%%lus %%%lus %%%lus\n",
(unsigned long)sizeof mapname,
(unsigned long)sizeof accname,
(unsigned long)sizeof options);
while (fgets(line, sizeof line, conf)) {
enum irs_map_id map;
enum irs_acc_id acc;
char *tmp;
int n;
for (tmp = line;
isascii((unsigned char)*tmp) &&
isspace((unsigned char)*tmp);
tmp++)
(void)NULL;
if (*tmp == '#' || *tmp == '\n' || *tmp == '\0')
continue;
n = sscanf(tmp, pattern, mapname, accname, options);
if (n < 2)
continue;
if (n < 3)
options[0] = '\0';
n = find_name(mapname, map_names);
INSIST(n < irs_nmap);
if (n < 0)
continue;
map = (enum irs_map_id) n;
n = find_name(accname, acc_names);
INSIST(n < irs_nacc);
if (n < 0)
continue;
acc = (enum irs_acc_id) n;
add_rule(irs, map, acc, options);
}
fclose(conf);
}