/usr/include/dnscore/packet_writer.h is in libyadifa-dev 2.1.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* Copyright (c) 2011-2016, EURid. All rights reserved.
* The YADIFA TM software product is provided under the BSD 3-clause license:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of EURid nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*------------------------------------------------------------------------------
*
*/
/** @defgroup dnspacket DNS Messages
* @ingroup dnscore
* @brief
*
*
*
* @{
*
*----------------------------------------------------------------------------*/
#ifndef _PACKET_WRITER_H
#define _PACKET_WRITER_H
#include <dnscore/sys_types.h>
#include <dnscore/output_stream.h>
#ifdef __cplusplus
extern "C"
{
#endif
typedef struct packet_dictionary_node packet_dictionary_node;
struct packet_dictionary_node // 16 / 28
{
packet_dictionary_node* next;
packet_dictionary_node* child;
u8* label;
u32 offset;
};
typedef struct packet_writer packet_writer;
struct packet_writer
{
packet_dictionary_node* head; // 4 8
packet_dictionary_node* pool_head; // 8 16
u8* packet; // 12 24
u32 packet_offset; // 16 28
u32 packet_limit; // 20 32
packet_dictionary_node pool[4096]; // 65556 114720 or 131104 (depending on struct alignment)
};
/**
*
* creates an new packet
*
* @param pc
* @param packet
* @param limit
*/
void packet_writer_create(packet_writer* pc, u8* packet, u16 limit);
/**
*
* initialises a writer based on an existing message
*
* @param pc
* @param packet a packet containing a valid message
* @param packet_offset
* @param size_limit
* @return
*/
ya_result packet_writer_init(packet_writer* pc, u8* packet, u32 packet_offset, u32 size_limit);
/**
* @note uncompressed names will not be compressed, of course *** BUT ***
* they will not be used in the compression dictionnary either
*/
ya_result packet_writer_add_fqdn_uncompressed(packet_writer* pc, const u8* fqdn);
ya_result packet_writer_add_fqdn(packet_writer* pc, const u8* fqdn);
ya_result packet_writer_add_rdata(packet_writer* pc, u16 rr_type, const u8* rdata, u16 rdata_len);
ya_result packet_writer_add_record(packet_writer* pc, const u8* fqdn, u16 rr_type, u16 rr_class, u32 ttl, const u8* rdata, u16 rdata_len);
static inline s32 packet_writer_remaining_capacity(packet_writer* pc)
{
return (s32)pc->packet_limit - (s32)pc->packet_offset;
}
static inline void packet_writer_set_u16(packet_writer* pc, u16 value, u32 offset)
{
SET_U16_AT(pc->packet[offset], value);
}
static inline void packet_writer_add_u16(packet_writer* pc, u16 value)
{
SET_U16_AT(pc->packet[pc->packet_offset], value);
pc->packet_offset += 2;
}
static inline void packet_writer_add_u32(packet_writer* pc, u32 value)
{
SET_U32_AT(pc->packet[pc->packet_offset], value);
pc->packet_offset += 4;
}
static inline void packet_writer_add_bytes(packet_writer* pc, const u8* buffer, u32 len)
{
MEMCOPY(&pc->packet[pc->packet_offset], buffer, len);
pc->packet_offset += len;
}
ya_result write_tcp_packet(packet_writer *pw, output_stream *tcpos);
#ifdef __cplusplus
}
#endif
#endif /* _PACKET_WRITER_H */
/** @} */
/*----------------------------------------------------------------------------*/
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