// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <assert.h>
#include <linux/bpf.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include "sock_example.h"
#include <unistd.h>
#include <arpa/inet.h>

struct pair {
        __u64 packets;
        __u64 bytes;
};

int main(int ac, char **argv)
{
        struct bpf_program *prog;
        struct bpf_object *obj;
        int map_fd, prog_fd;
        char filename[256];
        int i, sock, err;
        FILE *f;

        snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
        obj = bpf_object__open_file(filename, NULL);
        if (libbpf_get_error(obj))
                return 1;

        prog = bpf_object__next_program(obj, NULL);
        bpf_program__set_type(prog, BPF_PROG_TYPE_SOCKET_FILTER);

        err = bpf_object__load(obj);
        if (err)
                return 1;

        prog_fd = bpf_program__fd(prog);
        map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");

        sock = open_raw_sock("lo");

        assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,
                          sizeof(prog_fd)) == 0);

        f = popen("ping -4 -c5 localhost", "r");
        (void) f;

        for (i = 0; i < 5; i++) {
                int key = 0, next_key;
                struct pair value;

                while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
                        bpf_map_lookup_elem(map_fd, &next_key, &value);
                        printf("ip %s bytes %lld packets %lld\n",
                               inet_ntoa((struct in_addr){htonl(next_key)}),
                               value.bytes, value.packets);
                        key = next_key;
                }
                sleep(1);
        }
        return 0;
}