diff options
Diffstat (limited to 'src/libcharon/encoding/payloads/nonce_payload.c')
| -rw-r--r-- | src/libcharon/encoding/payloads/nonce_payload.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/src/libcharon/encoding/payloads/nonce_payload.c b/src/libcharon/encoding/payloads/nonce_payload.c new file mode 100644 index 000000000..4ad5ce9dd --- /dev/null +++ b/src/libcharon/encoding/payloads/nonce_payload.c @@ -0,0 +1,225 @@ +/* + * Copyright (C) 2005-2006 Martin Willi + * Copyright (C) 2005 Jan Hutter + * Hochschule fuer Technik Rapperswil + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +/* offsetof macro */ +#include <stddef.h> + +#include "nonce_payload.h" + +#include <encoding/payloads/encodings.h> + + +typedef struct private_nonce_payload_t private_nonce_payload_t; + +/** + * Private data of an nonce_payload_t object. + * + */ +struct private_nonce_payload_t { + /** + * Public nonce_payload_t interface. + */ + nonce_payload_t public; + + /** + * Next payload type. + */ + u_int8_t next_payload; + + /** + * Critical flag. + */ + bool critical; + + /** + * Length of this payload. + */ + u_int16_t payload_length; + + /** + * The contained nonce value. + */ + chunk_t nonce; +}; + +/** + * Encoding rules to parse or generate a nonce payload + * + * The defined offsets are the positions in a object of type + * private_nonce_payload_t. + * + */ +encoding_rule_t nonce_payload_encodings[] = { + /* 1 Byte next payload type, stored in the field next_payload */ + { U_INT_8, offsetof(private_nonce_payload_t, next_payload) }, + /* the critical bit */ + { FLAG, offsetof(private_nonce_payload_t, critical) }, + /* 7 Bit reserved bits, nowhere stored */ + { RESERVED_BIT, 0 }, + { RESERVED_BIT, 0 }, + { RESERVED_BIT, 0 }, + { RESERVED_BIT, 0 }, + { RESERVED_BIT, 0 }, + { RESERVED_BIT, 0 }, + { RESERVED_BIT, 0 }, + /* Length of the whole nonce payload*/ + { PAYLOAD_LENGTH, offsetof(private_nonce_payload_t, payload_length) }, + /* some nonce bytes, lenth is defined in PAYLOAD_LENGTH */ + { NONCE_DATA, offsetof(private_nonce_payload_t, nonce) } +}; + +/* 1 2 3 + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + ! Next Payload !C! RESERVED ! Payload Length ! + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + ! ! + ~ Nonce Data ~ + ! ! + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +*/ + +/** + * Implementation of payload_t.verify. + */ +static status_t verify(private_nonce_payload_t *this) +{ + if ((this->nonce.len < 16) || ((this->nonce.len > 256))) + { + /* nonce length is wrong */ + return FAILED; + } + + return SUCCESS; +} + +/** + * Implementation of nonce_payload_t.set_nonce. + */ +static status_t set_nonce(private_nonce_payload_t *this, chunk_t nonce) +{ + this->nonce.ptr = clalloc(nonce.ptr, nonce.len); + this->nonce.len = nonce.len; + this->payload_length = NONCE_PAYLOAD_HEADER_LENGTH + nonce.len; + return SUCCESS; +} + +/** + * Implementation of nonce_payload_t.get_nonce. + */ +static chunk_t get_nonce(private_nonce_payload_t *this) +{ + chunk_t nonce; + nonce.ptr = clalloc(this->nonce.ptr,this->nonce.len); + nonce.len = this->nonce.len; + return nonce; +} + +/** + * Implementation of nonce_payload_t.get_encoding_rules. + */ +static void get_encoding_rules(private_nonce_payload_t *this, encoding_rule_t **rules, size_t *rule_count) +{ + *rules = nonce_payload_encodings; + *rule_count = sizeof(nonce_payload_encodings) / sizeof(encoding_rule_t); +} + +/** + * Implementation of payload_t.get_type. + */ +static payload_type_t get_type(private_nonce_payload_t *this) +{ + return NONCE; +} + +/** + * Implementation of payload_t.get_next_type. + */ +static payload_type_t get_next_type(private_nonce_payload_t *this) +{ + return (this->next_payload); +} + +/** + * Implementation of payload_t.set_next_type. + */ +static void set_next_type(private_nonce_payload_t *this,payload_type_t type) +{ + this->next_payload = type; +} + +/** + * recompute the length of the payload. + */ +static void compute_length(private_nonce_payload_t *this) +{ + this->payload_length = NONCE_PAYLOAD_HEADER_LENGTH + this->nonce.len; +} + +/** + * Implementation of payload_t.get_length. + */ +static size_t get_length(private_nonce_payload_t *this) +{ + compute_length(this); + return this->payload_length; +} + +/** + * Implementation of payload_t.destroy and nonce_payload_t.destroy. + */ +static void destroy(private_nonce_payload_t *this) +{ + if (this->nonce.ptr != NULL) + { + free(this->nonce.ptr); + } + + free(this); +} + +/* + * Described in header + */ +nonce_payload_t *nonce_payload_create() +{ + private_nonce_payload_t *this = malloc_thing(private_nonce_payload_t); + + /* interface functions */ + this->public.payload_interface.verify = (status_t (*) (payload_t *))verify; + this->public.payload_interface.get_encoding_rules = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules; + this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length; + this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type; + this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type; + this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_type; + this->public.payload_interface.destroy = (void (*) (payload_t *))destroy; + + /* public functions */ + this->public.destroy = (void (*) (nonce_payload_t *)) destroy; + this->public.set_nonce = (void (*) (nonce_payload_t *,chunk_t)) set_nonce; + this->public.get_nonce = (chunk_t (*) (nonce_payload_t *)) get_nonce; + + /* private variables */ + this->critical = FALSE; + this->next_payload = NO_PAYLOAD; + this->payload_length = NONCE_PAYLOAD_HEADER_LENGTH; + this->nonce.ptr = NULL; + this->nonce.len = 0; + + return (&(this->public)); +} + + |