contrib/bind-9.2.4rc7/lib/bind/irs/gen_ng.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 1996,1999 by Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  15  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #if !defined(LINT) && !defined(CODECENTER)
  19 static const char rcsid[] = "$Id: gen_ng.c,v 1.1.2.1 2004/03/09 09:17:29 marka Exp $";
  20 #endif
  21
  22 /* Imports */
  23
  24 #include "port_before.h"
  25
  26 #include <sys/types.h>
  27
  28 #include <netinet/in.h>
  29 #include <arpa/nameser.h>
  30 #include <resolv.h>
  31
  32 #include <errno.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35
  36 #include <isc/memcluster.h>
  37 #include <irs.h>
  38
  39 #include "port_after.h"
  40
  41 #include "irs_p.h"
  42 #include "gen_p.h"
  43
  44 /* Types */
  45
  46 struct pvt {
  47         struct irs_rule *       rules;
  48         struct irs_rule *       rule;
  49         char *                  curgroup;
  50 };
  51
  52 /* Forward */
  53
  54 static void             ng_close(struct irs_ng *);
  55 static int              ng_next(struct irs_ng *, const char **,
  56                                 const char **, const char **);
  57 static int              ng_test(struct irs_ng *, const char *,
  58                                 const char *, const char *,
  59                                 const char *);
  60 static void             ng_rewind(struct irs_ng *, const char *);
  61 static void             ng_minimize(struct irs_ng *);
  62
  63 /* Public */
  64
  65 struct irs_ng *
  66 irs_gen_ng(struct irs_acc *this) {
  67         struct gen_p *accpvt = (struct gen_p *)this->private;
  68         struct irs_ng *ng;
  69         struct pvt *pvt;
  70
  71         if (!(ng = memget(sizeof *ng))) {
  72                 errno = ENOMEM;
  73                 return (NULL);
  74         }
  75         memset(ng, 0x5e, sizeof *ng);
  76         if (!(pvt = memget(sizeof *pvt))) {
  77                 memput(ng, sizeof *ng);
  78                 errno = ENOMEM;
  79                 return (NULL);
  80         }
  81         memset(pvt, 0, sizeof *pvt);
  82         pvt->rules = accpvt->map_rules[irs_ng];
  83         pvt->rule = pvt->rules;
  84         ng->private = pvt;
  85         ng->close = ng_close;
  86         ng->next = ng_next;
  87         ng->test = ng_test;
  88         ng->rewind = ng_rewind;
  89         ng->minimize = ng_minimize;
  90         return (ng);
  91 }
  92
  93 /* Methods */
  94
  95 static void
  96 ng_close(struct irs_ng *this) {
  97         struct pvt *pvt = (struct pvt *)this->private;
  98
  99         ng_minimize(this);
 100         if (pvt->curgroup)
 101                 free(pvt->curgroup);
 102         memput(pvt, sizeof *pvt);
 103         memput(this, sizeof *this);
 104 }
 105
 106 static int
 107 ng_next(struct irs_ng *this, const char **host, const char **user,
 108         const char **domain)
 109 {
 110         struct pvt *pvt = (struct pvt *)this->private;
 111         struct irs_ng *ng;
 112
 113         while (pvt->rule) {
 114                 ng = pvt->rule->inst->ng;
 115                 if ((*ng->next)(ng, host, user, domain) == 1)
 116                         return (1);
 117                 if (!(pvt->rule->flags & IRS_CONTINUE))
 118                         break;
 119                 pvt->rule = pvt->rule->next;
 120                 if (pvt->rule) {
 121                         ng = pvt->rule->inst->ng;
 122                         (*ng->rewind)(ng, pvt->curgroup);
 123                 }
 124         }
 125         return (0);
 126 }
 127
 128 static int
 129 ng_test(struct irs_ng *this, const char *name,
 130         const char *user, const char *host, const char *domain)
 131 {
 132         struct pvt *pvt = (struct pvt *)this->private;
 133         struct irs_rule *rule;
 134         struct irs_ng *ng;
 135         int rval;
 136
 137         rval = 0;
 138         for (rule = pvt->rules; rule; rule = rule->next) {
 139                 ng = rule->inst->ng;
 140                 rval = (*ng->test)(ng, name, user, host, domain);
 141                 if (rval || !(rule->flags & IRS_CONTINUE))
 142                         break;
 143         }
 144         return (rval);
 145 }
 146
 147 static void
 148 ng_rewind(struct irs_ng *this, const char *group) {
 149         struct pvt *pvt = (struct pvt *)this->private;
 150         struct irs_ng *ng;
 151
 152         pvt->rule = pvt->rules;
 153         if (pvt->rule) {
 154                 if (pvt->curgroup)
 155                         free(pvt->curgroup);
 156                 pvt->curgroup = strdup(group);
 157                 ng = pvt->rule->inst->ng;
 158                 (*ng->rewind)(ng, pvt->curgroup);
 159         }
 160 }
 161
 162 static void
 163 ng_minimize(struct irs_ng *this) {
 164         struct pvt *pvt = (struct pvt *)this->private;
 165         struct irs_rule *rule;
 166
 167         for (rule = pvt->rules; rule != NULL; rule = rule->next) {
 168                 struct irs_ng *ng = rule->inst->ng;
 169
 170                 (*ng->minimize)(ng);
 171         }
 172 }