stellar-stellar/include/stellar/packet.h

#pragma once

#ifdef __cplusplus
extern "C"
{
#endif

#include <stdint.h>

#define MAX_SIDS 8
struct sids
{
    uint16_t sid[MAX_SIDS];
    int used;
};
void packet_prepend_sids(struct packet *pkt, const struct sids *sids);

enum packet_direction
{
    PACKET_DIRECTION_OUTGOING = 0, // Internal -> External: 0
    PACKET_DIRECTION_INCOMING = 1, // External -> Internal: 1
};
enum packet_direction packet_get_direction(const struct packet *pkt);

enum packet_action
{
    PACKET_ACTION_FORWARD = 0,
    PACKET_ACTION_DROP = 1,
};
void packet_set_action(struct packet *pkt, enum packet_action action);
enum packet_action packet_get_action(const struct packet *pkt);

const char *packet_get_raw_data(const struct packet *pkt);
uint16_t packet_get_raw_len(const struct packet *pkt);

const char *packet_get_payload(const struct packet *pkt);
uint16_t packet_get_payload_len(const struct packet *pkt);

/*
 * tcp_seq: the sequence number of the new TCP packet (in host byte order)
 * tcp_ack: the acknowledgment number of the new TCP packet (in host byte order)
 * tcp_options_len: the length of the options (must be a multiple of 4)
 */
struct packet *craft_tcp_packet(const struct packet *origin_pkt, uint32_t tcp_seq, uint32_t tcp_ack, uint8_t tcp_flags,
                                  const char *tcp_options, uint16_t tcp_options_len,
                                  const char *tcp_payload, uint16_t tcp_payload_len);
struct packet *craft_udp_packet(const struct packet *origin_pkt, const char *udp_payload, uint16_t udp_payload_len);
struct packet *craft_packet_from_scratch(const struct layer larers[], uint16_t layer_count, const char *payload, uint16_t payload_len);

#ifdef __cplusplus
}
#endif