Annotation of embedaddon/strongswan/src/libcharon/encoding/payloads/fragment_payload.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2012 Tobias Brunner
! 3: * HSR Hochschule fuer Technik Rapperswil
! 4: *
! 5: * This program is free software; you can redistribute it and/or modify it
! 6: * under the terms of the GNU General Public License as published by the
! 7: * Free Software Foundation; either version 2 of the License, or (at your
! 8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
! 9: *
! 10: * This program is distributed in the hope that it will be useful, but
! 11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
! 13: * for more details.
! 14: */
! 15:
! 16: #include "fragment_payload.h"
! 17:
! 18: #include <encoding/payloads/encodings.h>
! 19:
! 20: /** Flag that is set in case the given fragment is the last for the message */
! 21: #define LAST_FRAGMENT 0x01
! 22:
! 23: typedef struct private_fragment_payload_t private_fragment_payload_t;
! 24:
! 25: /**
! 26: * Private data of an fragment_payload_t object.
! 27: */
! 28: struct private_fragment_payload_t {
! 29:
! 30: /**
! 31: * Public fragment_payload_t interface.
! 32: */
! 33: fragment_payload_t public;
! 34:
! 35: /**
! 36: * Next payload type.
! 37: */
! 38: uint8_t next_payload;
! 39:
! 40: /**
! 41: * Reserved byte
! 42: */
! 43: uint8_t reserved;
! 44:
! 45: /**
! 46: * Length of this payload.
! 47: */
! 48: uint16_t payload_length;
! 49:
! 50: /**
! 51: * Fragment ID.
! 52: */
! 53: uint16_t fragment_id;
! 54:
! 55: /**
! 56: * Fragment number.
! 57: */
! 58: uint8_t fragment_number;
! 59:
! 60: /**
! 61: * Flags
! 62: */
! 63: uint8_t flags;
! 64:
! 65: /**
! 66: * The contained fragment data.
! 67: */
! 68: chunk_t data;
! 69: };
! 70:
! 71: /**
! 72: * Encoding rules for an IKEv1 fragment payload
! 73: */
! 74: static encoding_rule_t encodings[] = {
! 75: /* 1 Byte next payload type, stored in the field next_payload */
! 76: { U_INT_8, offsetof(private_fragment_payload_t, next_payload) },
! 77: { RESERVED_BYTE, offsetof(private_fragment_payload_t, reserved) },
! 78: /* Length of the whole payload*/
! 79: { PAYLOAD_LENGTH, offsetof(private_fragment_payload_t, payload_length) },
! 80: { U_INT_16, offsetof(private_fragment_payload_t, fragment_id) },
! 81: { U_INT_8, offsetof(private_fragment_payload_t, fragment_number) },
! 82: { U_INT_8, offsetof(private_fragment_payload_t, flags) },
! 83: /* Fragment data is of variable size */
! 84: { CHUNK_DATA, offsetof(private_fragment_payload_t, data) },
! 85: };
! 86:
! 87: /*
! 88: 1 2 3
! 89: 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
! 90: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! 91: ! Next Payload ! RESERVED ! Payload Length !
! 92: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! 93: ! Fragment ID ! Fragment Num ! Flags !
! 94: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! 95: ! !
! 96: ~ Fragment Data ~
! 97: ! !
! 98: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! 99: */
! 100:
! 101: METHOD(payload_t, verify, status_t,
! 102: private_fragment_payload_t *this)
! 103: {
! 104: if (this->fragment_number == 0)
! 105: {
! 106: return FAILED;
! 107: }
! 108: return SUCCESS;
! 109: }
! 110:
! 111: METHOD(payload_t, get_encoding_rules, int,
! 112: private_fragment_payload_t *this, encoding_rule_t **rules)
! 113: {
! 114: *rules = encodings;
! 115: return countof(encodings);
! 116: }
! 117:
! 118: METHOD(payload_t, get_header_length, int,
! 119: private_fragment_payload_t *this)
! 120: {
! 121: return 8;
! 122: }
! 123:
! 124: METHOD(payload_t, get_type, payload_type_t,
! 125: private_fragment_payload_t *this)
! 126: {
! 127: return PLV1_FRAGMENT;
! 128: }
! 129:
! 130: METHOD(payload_t, get_next_type, payload_type_t,
! 131: private_fragment_payload_t *this)
! 132: {
! 133: return this->next_payload;
! 134: }
! 135:
! 136: METHOD(payload_t, set_next_type, void,
! 137: private_fragment_payload_t *this, payload_type_t type)
! 138: {
! 139: this->next_payload = type;
! 140: }
! 141:
! 142: METHOD(payload_t, get_length, size_t,
! 143: private_fragment_payload_t *this)
! 144: {
! 145: return this->payload_length;
! 146: }
! 147:
! 148: METHOD(fragment_payload_t, get_id, uint16_t,
! 149: private_fragment_payload_t *this)
! 150: {
! 151: return this->fragment_id;
! 152: }
! 153:
! 154: METHOD(fragment_payload_t, get_number, uint8_t,
! 155: private_fragment_payload_t *this)
! 156: {
! 157: return this->fragment_number;
! 158: }
! 159:
! 160: METHOD(fragment_payload_t, is_last, bool,
! 161: private_fragment_payload_t *this)
! 162: {
! 163: return (this->flags & LAST_FRAGMENT) == LAST_FRAGMENT;
! 164: }
! 165:
! 166: METHOD(fragment_payload_t, get_data, chunk_t,
! 167: private_fragment_payload_t *this)
! 168: {
! 169: return this->data;
! 170: }
! 171:
! 172: METHOD2(payload_t, fragment_payload_t, destroy, void,
! 173: private_fragment_payload_t *this)
! 174: {
! 175: free(this->data.ptr);
! 176: free(this);
! 177: }
! 178:
! 179: /*
! 180: * Described in header
! 181: */
! 182: fragment_payload_t *fragment_payload_create()
! 183: {
! 184: private_fragment_payload_t *this;
! 185:
! 186: INIT(this,
! 187: .public = {
! 188: .payload_interface = {
! 189: .verify = _verify,
! 190: .get_encoding_rules = _get_encoding_rules,
! 191: .get_header_length = _get_header_length,
! 192: .get_length = _get_length,
! 193: .get_next_type = _get_next_type,
! 194: .set_next_type = _set_next_type,
! 195: .get_type = _get_type,
! 196: .destroy = _destroy,
! 197: },
! 198: .get_id = _get_id,
! 199: .get_number = _get_number,
! 200: .is_last = _is_last,
! 201: .get_data = _get_data,
! 202: .destroy = _destroy,
! 203: },
! 204: .next_payload = PL_NONE,
! 205: );
! 206: this->payload_length = get_header_length(this);
! 207: return &this->public;
! 208: }
! 209:
! 210: /*
! 211: * Described in header
! 212: */
! 213: fragment_payload_t *fragment_payload_create_from_data(uint8_t num, bool last,
! 214: chunk_t data)
! 215: {
! 216: private_fragment_payload_t *this;
! 217:
! 218: this = (private_fragment_payload_t*)fragment_payload_create();
! 219: this->fragment_id = 1;
! 220: this->fragment_number = num;
! 221: this->flags |= (last ? LAST_FRAGMENT : 0);
! 222: this->data = chunk_clone(data);
! 223: this->payload_length = get_header_length(this) + data.len;
! 224: return &this->public;
! 225: }
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