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path: root/contrib/bind9/lib/bind/irs/gen_nw.c
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Diffstat (limited to 'contrib/bind9/lib/bind/irs/gen_nw.c')
-rw-r--r--contrib/bind9/lib/bind/irs/gen_nw.c262
1 files changed, 262 insertions, 0 deletions
diff --git a/contrib/bind9/lib/bind/irs/gen_nw.c b/contrib/bind9/lib/bind/irs/gen_nw.c
new file mode 100644
index 000000000000..cb41f5dbc99c
--- /dev/null
+++ b/contrib/bind9/lib/bind/irs/gen_nw.c
@@ -0,0 +1,262 @@
+/*
+ * 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 1.1.206.2 2004/03/17 01:49:40 marka 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);
+}
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