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586b130802
This introduces bounds checks in the BPv6 dictionary serialization logic so bugs in the calculation cannot result in out-of-bounds writes. Overall, the whole BPv6 serialization logic should be rewritten at some point as it is much more complex than it has to be. Signed-off-by: Felix Walter <felix.walter@d3tn.com>
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR Apache-2.0
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#ifndef BUNDLE6_BUNDLE6_H_INCLUDED
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#define BUNDLE6_BUNDLE6_H_INCLUDED
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#include "ud3tn/bundle.h"
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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/**
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* Perform basic validation of the provided bundle.
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*
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* This function asserts basic properties that are specified as mandatory by RFC 5050 and are
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* not already asserted by the parser or bundle-creation functions provided in this component.
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*/
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bool bundle6_is_valid(const struct bundle *bundle);
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// ---------------------
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// Serialization helpers
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// ---------------------
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struct bundle6_eid_reference {
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uint64_t scheme_offset;
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uint64_t ssp_offset;
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};
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struct bundle6_eid_info {
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const char *str_ptr;
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const char *ssp_ptr;
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uint64_t dict_scheme_offset;
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uint64_t dict_ssp_offset;
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};
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struct bundle6_dict_descriptor {
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size_t dict_length_bytes;
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size_t eid_reference_count;
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struct bundle6_eid_info destination_eid_info;
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struct bundle6_eid_info source_eid_info;
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struct bundle6_eid_info report_to_eid_info;
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struct bundle6_eid_info custodian_eid_info;
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// can be written out by memcopying parts and appending zero terminators
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struct bundle6_eid_info eid_references[];
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};
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/**
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* Serializes the bundle dictionary into the given buffer
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*/
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enum ud3tn_result bundle6_serialize_dictionary(
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char *buf, const struct bundle6_dict_descriptor *desc);
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// ----------------------
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// Bundle and block sizes
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// ----------------------
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struct bundle6_dict_descriptor *bundle6_calculate_dict(struct bundle *bundle);
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void bundle6_recalculate_header_length(struct bundle *bundle);
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size_t bundle6_get_serialized_size(struct bundle *bundle);
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// -------------------
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// Fragmentation sizes
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// -------------------
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size_t bundle6_get_first_fragment_min_size(struct bundle *bundle);
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size_t bundle6_get_mid_fragment_min_size(struct bundle *bundle);
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size_t bundle6_get_last_fragment_min_size(struct bundle *bundle);
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#endif /* BUNDLE6_BUNDLE6_H_INCLUDED */
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