src/libtnccs/plugins/tnccs_20/messages/ietf/pb_language_preference_msg.c

   1 /*
   2  * Copyright (C) 2010 Sansar Choinyambuu
   3  *
   4  * Copyright (C) secunet Security Networks AG
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15  */
  16
  17 #include "pb_language_preference_msg.h"
  18
  19 #include <bio/bio_writer.h>
  20 #include <bio/bio_reader.h>
  21 #include <utils/debug.h>
  22
  23 typedef struct private_pb_language_preference_msg_t private_pb_language_preference_msg_t;
  24
  25 /**
  26  *   PB-Language-Preference message (see section 4.10 of RFC 5793)
  27  *
  28  *      0                   1                   2                   3
  29  *      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  30  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  31  *     |              Language Preference (Variable Length)            |
  32  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  33  */
  34
  35 #define PB_LANG_PREFIX                  "Accept-Language: "
  36 #define PB_LANG_PREFIX_LEN              strlen(PB_LANG_PREFIX)
  37
  38 /**
  39  * Private data of a pb_language_preference_msg_t object.
  40  *
  41  */
  42 struct private_pb_language_preference_msg_t {
  43         /**
  44          * Public pb_access_recommendation_msg_t interface.
  45          */
  46         pb_language_preference_msg_t public;
  47
  48         /**
  49          * PB-TNC message type
  50          */
  51         pen_type_t type;
  52
  53         /**
  54          * Language preference
  55          */
  56         chunk_t language_preference;
  57
  58         /**
  59          * Encoded message
  60          */
  61         chunk_t encoding;
  62 };
  63
  64 METHOD(pb_tnc_msg_t, get_type, pen_type_t,
  65         private_pb_language_preference_msg_t *this)
  66 {
  67         return this->type;
  68 }
  69
  70 METHOD(pb_tnc_msg_t, get_encoding, chunk_t,
  71         private_pb_language_preference_msg_t *this)
  72 {
  73         return this->encoding;
  74 }
  75
  76 METHOD(pb_tnc_msg_t, build, void,
  77         private_pb_language_preference_msg_t *this)
  78 {
  79         if (this->encoding.ptr)
  80         {
  81                 return;
  82         }
  83         this->encoding = chunk_cat("cc",
  84                                                 chunk_create(PB_LANG_PREFIX, PB_LANG_PREFIX_LEN),
  85                                                 this->language_preference);
  86 }
  87
  88 METHOD(pb_tnc_msg_t, process, status_t,
  89         private_pb_language_preference_msg_t *this, uint32_t *offset)
  90 {
  91         chunk_t lang;
  92
  93         if (this->encoding.len >= PB_LANG_PREFIX_LEN &&
  94                 memeq(this->encoding.ptr, PB_LANG_PREFIX, PB_LANG_PREFIX_LEN))
  95         {
  96                 lang = chunk_skip(this->encoding, PB_LANG_PREFIX_LEN);
  97                 this->language_preference = lang.len ? chunk_clone(lang) : chunk_empty;
  98         }
  99         else
 100     {
 101                 DBG1(DBG_TNC, "language preference must be preceded by '%s'",
 102                                            PB_LANG_PREFIX);
 103                 *offset = 0;
 104                 return FAILED;
 105         }
 106
 107         if (this->language_preference.len &&
 108                 this->language_preference.ptr[this->language_preference.len-1] == '\0')
 109         {
 110                 DBG1(DBG_TNC, "language preference must not be null terminated");
 111                 *offset = PB_LANG_PREFIX_LEN + this->language_preference.len - 1;
 112                 return FAILED;
 113         }
 114
 115         return SUCCESS;
 116 }
 117
 118 METHOD(pb_tnc_msg_t, destroy, void,
 119         private_pb_language_preference_msg_t *this)
 120 {
 121         free(this->encoding.ptr);
 122         free(this->language_preference.ptr);
 123         free(this);
 124 }
 125
 126 METHOD(pb_language_preference_msg_t, get_language_preference, chunk_t,
 127         private_pb_language_preference_msg_t *this)
 128 {
 129         return this->language_preference;
 130 }
 131
 132 /**
 133  * See header
 134  */
 135 pb_tnc_msg_t *pb_language_preference_msg_create_from_data(chunk_t data)
 136 {
 137         private_pb_language_preference_msg_t *this;
 138
 139         INIT(this,
 140                 .public = {
 141                         .pb_interface = {
 142                                 .get_type = _get_type,
 143                                 .get_encoding = _get_encoding,
 144                                 .build = _build,
 145                                 .process = _process,
 146                                 .destroy = _destroy,
 147                         },
 148                         .get_language_preference = _get_language_preference,
 149                 },
 150                 .type = { PEN_IETF, PB_MSG_LANGUAGE_PREFERENCE },
 151                 .encoding = chunk_clone(data),
 152         );
 153
 154         return &this->public.pb_interface;
 155 }
 156
 157 /**
 158  * See header
 159  */
 160 pb_tnc_msg_t *pb_language_preference_msg_create(chunk_t language_preference)
 161 {
 162         private_pb_language_preference_msg_t *this;
 163
 164         INIT(this,
 165                 .public = {
 166                         .pb_interface = {
 167                                 .get_type = _get_type,
 168                                 .get_encoding = _get_encoding,
 169                                 .build = _build,
 170                                 .process = _process,
 171                                 .destroy = _destroy,
 172                         },
 173                         .get_language_preference = _get_language_preference,
 174                 },
 175                 .type = { PEN_IETF, PB_MSG_LANGUAGE_PREFERENCE },
 176                 .language_preference = chunk_clone(language_preference),
 177         );
 178
 179         return &this->public.pb_interface;
 180 }