/*
* 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_nw.c,v 1.4 2005/04/27 04:56:23 sra Exp $";
#endif
/* Imports */
#include "port_before.h"
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <errno.h>
#include <resolv.h>
#include <stdlib.h>
#include <string.h>
#include <isc/memcluster.h>
#include <irs.h>
#include "port_after.h"
#include "irs_p.h"
#include "gen_p.h"
/* Types */
struct pvt {
struct irs_rule * rules;
struct irs_rule * rule;
struct __res_state * res;
void (*free_res)(void *);
};
/* Forward */
static void nw_close(struct irs_nw*);
static struct nwent * nw_next(struct irs_nw *);
static struct nwent * nw_byname(struct irs_nw *, const char *, int);
static struct nwent * nw_byaddr(struct irs_nw *, void *, int, int);
static void nw_rewind(struct irs_nw *);
static void nw_minimize(struct irs_nw *);
static struct __res_state * nw_res_get(struct irs_nw *this);
static void nw_res_set(struct irs_nw *this,
struct __res_state *res,
void (*free_res)(void *));
static int init(struct irs_nw *this);
/* Public */
struct irs_nw *
irs_gen_nw(struct irs_acc *this) {
struct gen_p *accpvt = (struct gen_p *)this->private;
struct irs_nw *nw;
struct pvt *pvt;
if (!(pvt = memget(sizeof *pvt))) {
errno = ENOMEM;
return (NULL);
}
memset(pvt, 0, sizeof *pvt);
if (!(nw = memget(sizeof *nw))) {
memput(pvt, sizeof *pvt);
errno = ENOMEM;
return (NULL);
}
memset(nw, 0x5e, sizeof *nw);
pvt->rules = accpvt->map_rules[irs_nw];
pvt->rule = pvt->rules;
nw->private = pvt;
nw->close = nw_close;
nw->next = nw_next;
nw->byname = nw_byname;
nw->byaddr = nw_byaddr;
nw->rewind = nw_rewind;
nw->minimize = nw_minimize;
nw->res_get = nw_res_get;
nw->res_set = nw_res_set;
return (nw);
}
/* Methods */
static void
nw_close(struct irs_nw *this) {
struct pvt *pvt = (struct pvt *)this->private;
nw_minimize(this);
if (pvt->res && pvt->free_res)
(*pvt->free_res)(pvt->res);
memput(pvt, sizeof *pvt);
memput(this, sizeof *this);
}
static struct nwent *
nw_next(struct irs_nw *this) {
struct pvt *pvt = (struct pvt *)this->private;
struct nwent *rval;
struct irs_nw *nw;
if (init(this) == -1)
return(NULL);
while (pvt->rule) {
nw = pvt->rule->inst->nw;
rval = (*nw->next)(nw);
if (rval)
return (rval);
if (!(pvt->rules->flags & IRS_CONTINUE))
break;
pvt->rule = pvt->rule->next;
if (pvt->rule) {
nw = pvt->rule->inst->nw;
(*nw->rewind)(nw);
}
}
return (NULL);
}
static struct nwent *
nw_byname(struct irs_nw *this, const char *name, int type) {
struct pvt *pvt = (struct pvt *)this->private;
struct irs_rule *rule;
struct nwent *rval;
struct irs_nw *nw;
if (init(this) == -1)
return(NULL);
for (rule = pvt->rules; rule; rule = rule->next) {
nw = rule->inst->nw;
RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
rval = (*nw->byname)(nw, name, type);
if (rval != NULL)
return (rval);
if (pvt->res->res_h_errno != TRY_AGAIN &&
!(rule->flags & IRS_CONTINUE))
break;
}
return (NULL);
}
static struct nwent *
nw_byaddr(struct irs_nw *this, void *net, int length, int type) {
struct pvt *pvt = (struct pvt *)this->private;
struct irs_rule *rule;
struct nwent *rval;
struct irs_nw *nw;
if (init(this) == -1)
return(NULL);
for (rule = pvt->rules; rule; rule = rule->next) {
nw = rule->inst->nw;
RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
rval = (*nw->byaddr)(nw, net, length, type);
if (rval != NULL)
return (rval);
if (pvt->res->res_h_errno != TRY_AGAIN &&
!(rule->flags & IRS_CONTINUE))
break;
}
return (NULL);
}
static void
nw_rewind(struct irs_nw *this) {
struct pvt *pvt = (struct pvt *)this->private;
struct irs_nw *nw;
pvt->rule = pvt->rules;
if (pvt->rule) {
nw = pvt->rule->inst->nw;
(*nw->rewind)(nw);
}
}
static void
nw_minimize(struct irs_nw *this) {
struct pvt *pvt = (struct pvt *)this->private;
struct irs_rule *rule;
if (pvt->res)
res_nclose(pvt->res);
for (rule = pvt->rules; rule != NULL; rule = rule->next) {
struct irs_nw *nw = rule->inst->nw;
(*nw->minimize)(nw);
}
}
static struct __res_state *
nw_res_get(struct irs_nw *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (!pvt->res) {
struct __res_state *res;
res = (struct __res_state *)malloc(sizeof *res);
if (!res) {
errno = ENOMEM;
return (NULL);
}
memset(res, 0, sizeof *res);
nw_res_set(this, res, free);
}
return (pvt->res);
}
static void
nw_res_set(struct irs_nw *this, struct __res_state *res,
void (*free_res)(void *)) {
struct pvt *pvt = (struct pvt *)this->private;
struct irs_rule *rule;
if (pvt->res && pvt->free_res) {
res_nclose(pvt->res);
(*pvt->free_res)(pvt->res);
}
pvt->res = res;
pvt->free_res = free_res;
for (rule = pvt->rules; rule != NULL; rule = rule->next) {
struct irs_nw *nw = rule->inst->nw;
(*nw->res_set)(nw, pvt->res, NULL);
}
}
static int
init(struct irs_nw *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (!pvt->res && !nw_res_get(this))
return (-1);
if (((pvt->res->options & RES_INIT) == 0U) &&
res_ninit(pvt->res) == -1)
return (-1);
return (0);
}
/*! \file */