utun2/!/utun_test_socket_api.h

#ifndef UTUN_TEST_SOCKET_API_H
#define UTUN_TEST_SOCKET_API_H

#include <sys/socket.h>
#include <stdint.h>

struct utun_test_packet {
    uint8_t* data;
    size_t len;
    struct sockaddr_storage addr;
    socklen_t addrlen;
    struct utun_test_packet* next;
};

struct utun_test_packet_queue {
    struct utun_test_packet* head;
    struct utun_test_packet* tail;
    size_t count;
};

struct utun_test_socket_api {
    struct utun_test_packet_queue send_queue;
    struct utun_test_packet_queue recv_queue;
    
    ssize_t (*on_send)(const uint8_t* data, size_t len,
                      const struct sockaddr* dest_addr, socklen_t dest_addrlen,
                      void* user_data);
    
    ssize_t (*on_recv)(uint8_t* buffer, size_t buffer_size,
                      struct sockaddr* src_addr, socklen_t* src_addrlen,
                      void* user_data);
    
    void* user_data;
};

void utun_test_packet_queue_init(struct utun_test_packet_queue* queue);
void utun_test_packet_queue_cleanup(struct utun_test_packet_queue* queue);
void utun_test_packet_queue_push(struct utun_test_packet_queue* queue,
                                const uint8_t* data, size_t len,
                                const struct sockaddr* addr, socklen_t addrlen);
struct utun_test_packet* utun_test_packet_queue_pop(struct utun_test_packet_queue* queue);
size_t utun_test_packet_queue_count(struct utun_test_packet_queue* queue);

ssize_t utun_test_default_on_send(const uint8_t* data, size_t len,
                                 const struct sockaddr* dest_addr, socklen_t dest_addrlen,
                                 void* user_data);

ssize_t utun_test_default_on_recv(uint8_t* buffer, size_t buffer_size,
                                 struct sockaddr* src_addr, socklen_t* src_addrlen,
                                 void* user_data);

#endif