/* * Copyright (C) 2005-2010 Martin Willi * Copyright (C) 2010 revosec AG * 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 . * * 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. */ #include #include "ts_payload.h" #include #include typedef struct private_ts_payload_t private_ts_payload_t; /** * Private data of an ts_payload_t object. */ struct private_ts_payload_t { /** * Public ts_payload_t interface. */ ts_payload_t public; /** * TRUE if this TS payload is of type TSi, FALSE for TSr. */ bool is_initiator; /** * Next payload type. */ u_int8_t next_payload; /** * Critical flag. */ bool critical; /** * reserved bits */ bool reserved_bit[7]; /** * reserved bytes */ bool reserved_byte[3]; /** * Length of this payload. */ u_int16_t payload_length; /** * Number of traffic selectors */ u_int8_t ts_num; /** * Contains the traffic selectors of type traffic_selector_substructure_t. */ linked_list_t *substrs; }; /** * Encoding rules to parse or generate a TS payload * * The defined offsets are the positions in a object of type * private_ts_payload_t. */ static encoding_rule_t encodings[] = { /* 1 Byte next payload type, stored in the field next_payload */ { U_INT_8, offsetof(private_ts_payload_t, next_payload) }, /* the critical bit */ { FLAG, offsetof(private_ts_payload_t, critical) }, /* 7 Bit reserved bits */ { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[0]) }, { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[1]) }, { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[2]) }, { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[3]) }, { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[4]) }, { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[5]) }, { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[6]) }, /* Length of the whole payload*/ { PAYLOAD_LENGTH, offsetof(private_ts_payload_t, payload_length) }, /* 1 Byte TS type*/ { U_INT_8, offsetof(private_ts_payload_t, ts_num) }, /* 3 reserved bytes */ { RESERVED_BYTE, offsetof(private_ts_payload_t, reserved_byte[0])}, { RESERVED_BYTE, offsetof(private_ts_payload_t, reserved_byte[1])}, { RESERVED_BYTE, offsetof(private_ts_payload_t, reserved_byte[2])}, /* wrapped list of traffic selectors substructures */ { PAYLOAD_LIST + TRAFFIC_SELECTOR_SUBSTRUCTURE, offsetof(private_ts_payload_t, substrs) }, }; /* 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 ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! Number of TSs ! RESERVED ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! ! ~ ~ ! ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ METHOD(payload_t, verify, status_t, private_ts_payload_t *this) { enumerator_t *enumerator; payload_t *substr; status_t status = SUCCESS; if (this->ts_num != this->substrs->get_count(this->substrs)) { return FAILED; } enumerator = this->substrs->create_enumerator(this->substrs); while (enumerator->enumerate(enumerator, &substr)) { status = substr->verify(substr); if (status != SUCCESS) { break; } } enumerator->destroy(enumerator); return status; } METHOD(payload_t, get_encoding_rules, int, private_ts_payload_t *this, encoding_rule_t **rules) { *rules = encodings; return countof(encodings); } METHOD(payload_t, get_header_length, int, private_ts_payload_t *this) { return 8; } METHOD(payload_t, get_type, payload_type_t, private_ts_payload_t *this) { if (this->is_initiator) { return TRAFFIC_SELECTOR_INITIATOR; } return TRAFFIC_SELECTOR_RESPONDER; } METHOD(payload_t, get_next_type, payload_type_t, private_ts_payload_t *this) { return this->next_payload; } METHOD(payload_t, set_next_type, void, private_ts_payload_t *this,payload_type_t type) { this->next_payload = type; } /** * recompute the length of the payload. */ static void compute_length(private_ts_payload_t *this) { enumerator_t *enumerator; payload_t *subst; this->payload_length = get_header_length(this); this->ts_num = 0; enumerator = this->substrs->create_enumerator(this->substrs); while (enumerator->enumerate(enumerator, &subst)) { this->payload_length += subst->get_length(subst); this->ts_num++; } enumerator->destroy(enumerator); } METHOD(payload_t, get_length, size_t, private_ts_payload_t *this) { return this->payload_length; } METHOD(ts_payload_t, get_initiator, bool, private_ts_payload_t *this) { return this->is_initiator; } METHOD(ts_payload_t, set_initiator, void, private_ts_payload_t *this,bool is_initiator) { this->is_initiator = is_initiator; } METHOD(ts_payload_t, get_traffic_selectors, linked_list_t*, private_ts_payload_t *this) { traffic_selector_t *ts; enumerator_t *enumerator; traffic_selector_substructure_t *subst; linked_list_t *list; list = linked_list_create(); enumerator = this->substrs->create_enumerator(this->substrs); while (enumerator->enumerate(enumerator, &subst)) { ts = subst->get_traffic_selector(subst); list->insert_last(list, ts); } enumerator->destroy(enumerator); return list; } METHOD2(payload_t, ts_payload_t, destroy, void, private_ts_payload_t *this) { this->substrs->destroy_offset(this->substrs, offsetof(payload_t, destroy)); free(this); } /* * Described in header */ ts_payload_t *ts_payload_create(bool is_initiator) { private_ts_payload_t *this; INIT(this, .public = { .payload_interface = { .verify = _verify, .get_encoding_rules = _get_encoding_rules, .get_header_length = _get_header_length, .get_length = _get_length, .get_next_type = _get_next_type, .set_next_type = _set_next_type, .get_type = _get_type, .destroy = _destroy, }, .get_initiator = _get_initiator, .set_initiator = _set_initiator, .get_traffic_selectors = _get_traffic_selectors, .destroy = _destroy, }, .next_payload = NO_PAYLOAD, .payload_length = get_header_length(this), .is_initiator = is_initiator, .substrs = linked_list_create(), ); return &this->public; } /* * Described in header */ ts_payload_t *ts_payload_create_from_traffic_selectors(bool is_initiator, linked_list_t *traffic_selectors) { enumerator_t *enumerator; traffic_selector_t *ts; traffic_selector_substructure_t *subst; private_ts_payload_t *this; this = (private_ts_payload_t*)ts_payload_create(is_initiator); enumerator = traffic_selectors->create_enumerator(traffic_selectors); while (enumerator->enumerate(enumerator, &ts)) { subst = traffic_selector_substructure_create_from_traffic_selector(ts); this->substrs->insert_last(this->substrs, subst); } enumerator->destroy(enumerator); compute_length(this); return &this->public; }