Annotation of embedaddon/strongswan/src/libcharon/encoding/payloads/nonce_payload.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2005-2010 Martin Willi
! 3: * Copyright (C) 2010 revosec AG
! 4: * Copyright (C) 2005 Jan Hutter
! 5: * HSR Hochschule fuer Technik Rapperswil
! 6: *
! 7: * This program is free software; you can redistribute it and/or modify it
! 8: * under the terms of the GNU General Public License as published by the
! 9: * Free Software Foundation; either version 2 of the License, or (at your
! 10: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
! 11: *
! 12: * This program is distributed in the hope that it will be useful, but
! 13: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 14: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
! 15: * for more details.
! 16: */
! 17:
! 18: #include <stddef.h>
! 19:
! 20: #include "nonce_payload.h"
! 21:
! 22: #include <daemon.h>
! 23: #include <encoding/payloads/encodings.h>
! 24:
! 25: typedef struct private_nonce_payload_t private_nonce_payload_t;
! 26:
! 27: /**
! 28: * Private data of an nonce_payload_t object.
! 29: */
! 30: struct private_nonce_payload_t {
! 31:
! 32: /**
! 33: * Public nonce_payload_t interface.
! 34: */
! 35: nonce_payload_t public;
! 36:
! 37: /**
! 38: * Next payload type.
! 39: */
! 40: uint8_t next_payload;
! 41:
! 42: /**
! 43: * Critical flag.
! 44: */
! 45: bool critical;
! 46:
! 47: /**
! 48: * Reserved bits
! 49: */
! 50: bool reserved[7];
! 51:
! 52: /**
! 53: * Length of this payload.
! 54: */
! 55: uint16_t payload_length;
! 56:
! 57: /**
! 58: * The contained nonce value.
! 59: */
! 60: chunk_t nonce;
! 61:
! 62: /**
! 63: * Payload type, PLV2_NONCE or PLV1_NONCE
! 64: */
! 65: payload_type_t type;
! 66: };
! 67:
! 68: /**
! 69: * Encoding rules to parse or generate a nonce payload
! 70: *
! 71: * The defined offsets are the positions in a object of type
! 72: * private_nonce_payload_t.
! 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_nonce_payload_t, next_payload) },
! 77: /* the critical bit */
! 78: { FLAG, offsetof(private_nonce_payload_t, critical) },
! 79: /* 7 Bit reserved bits */
! 80: { RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[0]) },
! 81: { RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[1]) },
! 82: { RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[2]) },
! 83: { RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[3]) },
! 84: { RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[4]) },
! 85: { RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[5]) },
! 86: { RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[6]) },
! 87: /* Length of the whole nonce payload*/
! 88: { PAYLOAD_LENGTH, offsetof(private_nonce_payload_t, payload_length) },
! 89: /* some nonce bytes, length is defined in PAYLOAD_LENGTH */
! 90: { CHUNK_DATA, offsetof(private_nonce_payload_t, nonce) },
! 91: };
! 92:
! 93: /* 1 2 3
! 94: 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
! 95: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! 96: ! Next Payload !C! RESERVED ! Payload Length !
! 97: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! 98: ! !
! 99: ~ Nonce Data ~
! 100: ! !
! 101: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! 102: */
! 103:
! 104: METHOD(payload_t, verify, status_t,
! 105: private_nonce_payload_t *this)
! 106: {
! 107: bool bad_length = FALSE;
! 108:
! 109: if (this->nonce.len > 256)
! 110: {
! 111: bad_length = TRUE;
! 112: }
! 113: if (this->type == PLV2_NONCE &&
! 114: this->nonce.len < 16)
! 115: {
! 116: bad_length = TRUE;
! 117: }
! 118: if (this->type == PLV1_NONCE &&
! 119: this->nonce.len < 8)
! 120: {
! 121: bad_length = TRUE;
! 122: }
! 123: if (bad_length)
! 124: {
! 125: DBG1(DBG_ENC, "%N payload has invalid length (%d bytes)",
! 126: payload_type_names, this->type, this->nonce.len);
! 127: return FAILED;
! 128: }
! 129: return SUCCESS;
! 130: }
! 131:
! 132: METHOD(payload_t, get_encoding_rules, int,
! 133: private_nonce_payload_t *this, encoding_rule_t **rules)
! 134: {
! 135: *rules = encodings;
! 136: return countof(encodings);
! 137: }
! 138:
! 139: METHOD(payload_t, get_header_length, int,
! 140: private_nonce_payload_t *this)
! 141: {
! 142: return 4;
! 143: }
! 144:
! 145: METHOD(payload_t, get_type, payload_type_t,
! 146: private_nonce_payload_t *this)
! 147: {
! 148: return this->type;
! 149: }
! 150:
! 151: METHOD(payload_t, get_next_type, payload_type_t,
! 152: private_nonce_payload_t *this)
! 153: {
! 154: return this->next_payload;
! 155: }
! 156:
! 157: METHOD(payload_t, set_next_type, void,
! 158: private_nonce_payload_t *this, payload_type_t type)
! 159: {
! 160: this->next_payload = type;
! 161: }
! 162:
! 163: METHOD(payload_t, get_length, size_t,
! 164: private_nonce_payload_t *this)
! 165: {
! 166: return this->payload_length;
! 167: }
! 168:
! 169: METHOD(nonce_payload_t, set_nonce, void,
! 170: private_nonce_payload_t *this, chunk_t nonce)
! 171: {
! 172: this->nonce = chunk_clone(nonce);
! 173: this->payload_length = get_header_length(this) + nonce.len;
! 174: }
! 175:
! 176: METHOD(nonce_payload_t, get_nonce, chunk_t,
! 177: private_nonce_payload_t *this)
! 178: {
! 179: return chunk_clone(this->nonce);
! 180: }
! 181:
! 182: METHOD2(payload_t, nonce_payload_t, destroy, void,
! 183: private_nonce_payload_t *this)
! 184: {
! 185: free(this->nonce.ptr);
! 186: free(this);
! 187: }
! 188:
! 189: /*
! 190: * Described in header
! 191: */
! 192: nonce_payload_t *nonce_payload_create(payload_type_t type)
! 193: {
! 194: private_nonce_payload_t *this;
! 195:
! 196: INIT(this,
! 197: .public = {
! 198: .payload_interface = {
! 199: .verify = _verify,
! 200: .get_encoding_rules = _get_encoding_rules,
! 201: .get_header_length = _get_header_length,
! 202: .get_length = _get_length,
! 203: .get_next_type = _get_next_type,
! 204: .set_next_type = _set_next_type,
! 205: .get_type = _get_type,
! 206: .destroy = _destroy,
! 207: },
! 208: .set_nonce = _set_nonce,
! 209: .get_nonce = _get_nonce,
! 210: .destroy = _destroy,
! 211: },
! 212: .next_payload = PL_NONE,
! 213: .payload_length = get_header_length(this),
! 214: .type = type,
! 215: );
! 216: return &this->public;
! 217: }
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