/* $NetBSD: gen_nw.c,v 1.1.1.2 2012/09/09 16:07:55 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(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 #include #include #include #include #include #include #include #include #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 */