#pragma once

/*
 * Test Helpers
 * Bunch of helpers to setup the environment for networking tests. This
 * includes net-namespace setups, veth setups, and more.
 */

#include <assert.h>
#include <endian.h>
#include <errno.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <poll.h>
#include <sched.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include "n-acd.h"

static inline void test_if_query(const char *name, int *indexp, struct ether_addr *macp) {
        struct ifreq ifr = {};
        size_t l;
        int r, s;

        l = strlen(name);
        assert(l <= IF_NAMESIZE);

        if (indexp) {
                *indexp = if_nametoindex(name);
                assert(*indexp > 0);
        }

        if (macp) {
                s = socket(AF_INET, SOCK_DGRAM, 0);
                assert(s >= 0);

                strncpy(ifr.ifr_name, name, l);
                r = ioctl(s, SIOCGIFHWADDR, &ifr);
                assert(r >= 0);

                memcpy(macp->ether_addr_octet, ifr.ifr_hwaddr.sa_data, ETH_ALEN);

                close(s);
        }
}

static inline void test_veth_cmd(int ifindex, const char *cmd) {
        char *p, name[IF_NAMESIZE + 1] = {};
        int r;

        p = if_indextoname(ifindex, name);
        assert(p);

        r = asprintf(&p, "ip link set %s %s", name, cmd);
        assert(r >= 0);

        /* Again: Ewwww... */
        r = system(p);
        assert(r == 0);

        free(p);
}

static inline void test_veth_new(int *parent_indexp,
                                 struct ether_addr *parent_macp,
                                 int *child_indexp,
                                 struct ether_addr *child_macp) {
        int r;

        /* Eww... but it works. */
        r = system("ip link add type veth");
        assert(r == 0);
        r = system("ip link set veth0 up");
        assert(r == 0);
        r = system("ip link set veth1 up");
        assert(r == 0);

        test_if_query("veth0", parent_indexp, parent_macp);
        test_if_query("veth1", child_indexp, child_macp);
}

static inline int test_setup(void) {
        int r;

        r = unshare(CLONE_NEWNET);
        if (r < 0) {
                assert(errno == EPERM);
                return 77;
        }

        return 0;
}