usr/src/lib/libresolv2/common/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 /* Imports */
  19
  20 #include "port_before.h"
  21
  22 #include <sys/types.h>
  23
  24 #include <netinet/in.h>
  25 #include <arpa/nameser.h>
  26 #include <resolv.h>
  27
  28 #include <errno.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include <isc/memcluster.h>
  33 #include <irs.h>
  34
  35 #include "port_after.h"
  36
  37 #include "irs_p.h"
  38 #include "gen_p.h"
  39
  40 /* Types */
  41
  42 struct pvt {
  43         struct irs_rule *       rules;
  44         struct irs_rule *       rule;
  45         char *                  curgroup;
  46 };
  47
  48 /* Forward */
  49
  50 static void             ng_close(struct irs_ng *);
  51 static int              ng_next(struct irs_ng *, const char **,
  52                                 const char **, const char **);
  53 static int              ng_test(struct irs_ng *, const char *,
  54                                 const char *, const char *,
  55                                 const char *);
  56 static void             ng_rewind(struct irs_ng *, const char *);
  57 static void             ng_minimize(struct irs_ng *);
  58
  59 /* Public */
  60
  61 struct irs_ng *
  62 irs_gen_ng(struct irs_acc *this) {
  63         struct gen_p *accpvt = (struct gen_p *)this->private;
  64         struct irs_ng *ng;
  65         struct pvt *pvt;
  66
  67         if (!(ng = memget(sizeof *ng))) {
  68                 errno = ENOMEM;
  69                 return (NULL);
  70         }
  71         memset(ng, 0x5e, sizeof *ng);
  72         if (!(pvt = memget(sizeof *pvt))) {
  73                 memput(ng, sizeof *ng);
  74                 errno = ENOMEM;
  75                 return (NULL);
  76         }
  77         memset(pvt, 0, sizeof *pvt);
  78         pvt->rules = accpvt->map_rules[irs_ng];
  79         pvt->rule = pvt->rules;
  80         ng->private = pvt;
  81         ng->close = ng_close;
  82         ng->next = ng_next;
  83         ng->test = ng_test;
  84         ng->rewind = ng_rewind;
  85         ng->minimize = ng_minimize;
  86         return (ng);
  87 }
  88
  89 /* Methods */
  90
  91 static void
  92 ng_close(struct irs_ng *this) {
  93         struct pvt *pvt = (struct pvt *)this->private;
  94
  95         ng_minimize(this);
  96         free(pvt->curgroup);
  97         memput(pvt, sizeof *pvt);
  98         memput(this, sizeof *this);
  99 }
 100
 101 static int
 102 ng_next(struct irs_ng *this, const char **host, const char **user,
 103         const char **domain)
 104 {
 105         struct pvt *pvt = (struct pvt *)this->private;
 106         struct irs_ng *ng;
 107
 108         while (pvt->rule) {
 109                 ng = pvt->rule->inst->ng;
 110                 if ((*ng->next)(ng, host, user, domain) == 1)
 111                         return (1);
 112                 if (!(pvt->rule->flags & IRS_CONTINUE))
 113                         break;
 114                 pvt->rule = pvt->rule->next;
 115                 if (pvt->rule) {
 116                         ng = pvt->rule->inst->ng;
 117                         (*ng->rewind)(ng, pvt->curgroup);
 118                 }
 119         }
 120         return (0);
 121 }
 122
 123 static int
 124 ng_test(struct irs_ng *this, const char *name,
 125         const char *user, const char *host, const char *domain)
 126 {
 127         struct pvt *pvt = (struct pvt *)this->private;
 128         struct irs_rule *rule;
 129         struct irs_ng *ng;
 130         int rval;
 131
 132         rval = 0;
 133         for (rule = pvt->rules; rule; rule = rule->next) {
 134                 ng = rule->inst->ng;
 135                 rval = (*ng->test)(ng, name, user, host, domain);
 136                 if (rval || !(rule->flags & IRS_CONTINUE))
 137                         break;
 138         }
 139         return (rval);
 140 }
 141
 142 static void
 143 ng_rewind(struct irs_ng *this, const char *group) {
 144         struct pvt *pvt = (struct pvt *)this->private;
 145         struct irs_ng *ng;
 146
 147         pvt->rule = pvt->rules;
 148         if (pvt->rule) {
 149                 free(pvt->curgroup);
 150                 pvt->curgroup = strdup(group);
 151                 ng = pvt->rule->inst->ng;
 152                 (*ng->rewind)(ng, pvt->curgroup);
 153         }
 154 }
 155
 156 static void
 157 ng_minimize(struct irs_ng *this) {
 158         struct pvt *pvt = (struct pvt *)this->private;
 159         struct irs_rule *rule;
 160
 161         for (rule = pvt->rules; rule != NULL; rule = rule->next) {
 162                 struct irs_ng *ng = rule->inst->ng;
 163
 164                 (*ng->minimize)(ng);
 165         }
 166 }
 167
 168 /*! \file */