include/tr_filter.h

   1 /*
   2  * Copyright (c) 2012, 2013, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  26  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  27  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  29  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  31  * OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  */
  34
  35 #ifndef TR_FILTER_H
  36 #define TR_FILTER_H
  37
  38 #include <talloc.h>
  39 #include <jansson.h>
  40 #include <glib.h>
  41
  42 #include <tr_list.h>
  43 #include <tr_name_internal.h>
  44 #include <trust_router/tr_constraint.h>
  45 #include <trust_router/tid.h>
  46 #include <trust_router/trp.h>
  47
  48 /* Filter actions */
  49 typedef enum tr_filter_action {
  50   TR_FILTER_ACTION_REJECT = 0,
  51   TR_FILTER_ACTION_ACCEPT,
  52   TR_FILTER_ACTION_UNKNOWN
  53 } TR_FILTER_ACTION;
  54
  55 /* Match codes */
  56 #define TR_FILTER_MATCH 0
  57 #define TR_FILTER_NO_MATCH 1
  58
  59 /* Filter types */
  60 typedef enum {
  61   TR_FILTER_TYPE_TID_INBOUND = 0,
  62   TR_FILTER_TYPE_TRP_INBOUND,
  63   TR_FILTER_TYPE_TRP_OUTBOUND,
  64   TR_FILTER_TYPE_UNKNOWN
  65 } TR_FILTER_TYPE;
  66
  67 typedef struct tr_fspec {
  68   TR_NAME *field;
  69   TR_LIST *match;
  70 } TR_FSPEC;
  71
  72 typedef struct tr_fline {
  73   TR_FILTER_ACTION action;
  74   GPtrArray *specs;
  75   TR_CONSTRAINT *realm_cons;
  76   TR_CONSTRAINT *domain_cons;
  77 } TR_FLINE;
  78
  79 typedef struct tr_fline_iter {
  80   TR_FLINE *fline;
  81   guint ii;
  82 } TR_FLINE_ITER;
  83
  84 typedef struct tr_filter {
  85   TR_FILTER_TYPE type;
  86   TR_LIST *lines;
  87 } TR_FILTER;
  88
  89 typedef struct tr_filter_set TR_FILTER_SET;
  90 struct tr_filter_set {
  91   TR_FILTER *this;
  92   TR_FILTER_SET *next;
  93 };
  94
  95 /**
  96  * Structure to hold information needed to filter different targets.
  97  */
  98 typedef struct tr_filter_target {
  99   /* An inforec also needs realm and community information */
 100   TRP_INFOREC *trp_inforec;
 101   TRP_UPD *trp_upd;
 102
 103   /* a TID request has all the data it needs to be filtered */
 104   TID_REQ *tid_req;
 105 } TR_FILTER_TARGET;
 106
 107 TR_FILTER_SET *tr_filter_set_new(TALLOC_CTX *mem_ctx);
 108 void tr_filter_set_free(TR_FILTER_SET *fs);
 109 int tr_filter_set_add(TR_FILTER_SET *set, TR_FILTER *new);
 110 TR_FILTER *tr_filter_set_get(TR_FILTER_SET *set, TR_FILTER_TYPE type);
 111
 112 TR_FILTER *tr_filter_new(TALLOC_CTX *mem_ctx);
 113 void tr_filter_free(TR_FILTER *filt);
 114
 115 void tr_filter_set_type(TR_FILTER *filt, TR_FILTER_TYPE type);
 116 TR_FILTER_TYPE tr_filter_get_type(TR_FILTER *filt);
 117 TR_FLINE *tr_filter_add_line(TR_FILTER *filt, TR_FLINE *line);
 118
 119 TR_FLINE *tr_fline_new(TALLOC_CTX *mem_ctx);
 120 void tr_fline_free(TR_FLINE *fline);
 121 TR_FSPEC *tr_fline_add_spec(TR_FLINE *fline, TR_FSPEC *spec);
 122
 123 TR_FSPEC *tr_fspec_new(TALLOC_CTX *mem_ctx);
 124 void tr_fspec_free(TR_FSPEC *fspec);
 125 TR_NAME *tr_fspec_add_match(TR_FSPEC *fspec, TR_NAME *match);
 126
 127 int tr_fspec_matches(TR_FSPEC *fspec, TR_FILTER_TYPE ftype, TR_FILTER_TARGET *target);
 128
 129 /* Iterator for TR_FILTER.lines */
 130 typedef TR_LIST_ITER TR_FILTER_ITER;
 131 #define tr_filter_iter_new(CTX) (tr_list_iter_new(CTX))
 132 #define tr_filter_iter_free(ITER) (tr_list_iter_free(ITER))
 133 #define tr_filter_iter_first(ITER, FILT) ((TR_FLINE *) tr_list_iter_first((ITER), (FILT)->lines))
 134 #define tr_filter_iter_next(ITER) ((TR_FLINE *) tr_list_iter_next(ITER))
 135 #define tr_filter_add_line(FILT, LINE) ((TR_FLINE *) tr_list_add((FILT)->lines, (LINE), 1))
 136
 137 TR_FLINE_ITER *tr_fline_iter_new(TALLOC_CTX *mem_ctx);
 138 void tr_fline_iter_free(TR_FLINE_ITER *iter);
 139 TR_FSPEC * tr_fline_iter_first(TR_FLINE_ITER *iter, TR_FLINE *fline);
 140 TR_FSPEC * tr_fline_iter_next(TR_FLINE_ITER *iter);
 141
 142 /* Iterator for TR_FSPEC matches */
 143 typedef TR_LIST_ITER TR_FSPEC_ITER;
 144 #define tr_fspec_iter_new(CTX) (tr_list_iter_new(CTX))
 145 #define tr_fspec_iter_free(ITER) (tr_list_iter_free(ITER))
 146 #define tr_fspec_iter_first(ITER, SPEC) (tr_list_iter_first((ITER), (SPEC)->match))
 147 #define tr_fspec_iter_next(ITER) (tr_list_iter_next(ITER))
 148 #define tr_fspec_add_match(SPEC, MATCH) ((TR_NAME *) tr_list_add((SPEC)->match, (MATCH), 0))
 149
 150 /*In tr_constraint.c and exported, but not really a public symbol; needed by tr_filter.c and by tr_constraint.c*/
 151 int TR_EXPORT tr_prefix_wildcard_match(const char *str, const char *wc_str);
 152
 153 int tr_filter_apply(TR_FILTER_TARGET *target, TR_FILTER *filt, TR_CONSTRAINT_SET **constraints, TR_FILTER_ACTION *out_action);
 154 void tr_filter_target_free(TR_FILTER_TARGET *target);
 155 TR_FILTER_TARGET *tr_filter_target_tid_req(TALLOC_CTX *mem_ctx, TID_REQ *req);
 156 TR_FILTER_TARGET *tr_filter_target_trp_inforec(TALLOC_CTX *mem_ctx, TRP_UPD *upd, TRP_INFOREC *inforec);
 157
 158 TR_CONSTRAINT_SET *tr_constraint_set_from_fline(TR_FLINE *fline);
 159
 160 int tr_filter_validate(TR_FILTER *filt);
 161 int tr_filter_validate_spec_field(TR_FILTER_TYPE ftype, TR_FSPEC *fspec);
 162 const char *tr_filter_type_to_string(TR_FILTER_TYPE ftype);
 163 TR_FILTER_TYPE tr_filter_type_from_string(const char *s);
 164
 165 /* tr_filter_encoders.c */
 166 json_t *tr_filter_set_to_json(TR_FILTER_SET *filter_set);
 167
 168 #endif