/* SPDX-License-Identifier: LGPL-2.1+ */

#include <fcntl.h>

#include <sys/stat.h>

#include <sys/types.h>

#include "fuzz.h"

#include "sd-dhcp-server.c"

/* stub out network so that the server doesn't send */

ssize_t sendto(int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen) {

        return len;

}

ssize_t sendmsg(int sockfd, const struct msghdr *msg, int flags) {

        return 0;

}

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {

        _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL;

        struct in_addr address = {.s_addr = htobe32(UINT32_C(10) << 24 | UINT32_C(1))};

        static const uint8_t chaddr[] = {3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3};

        uint8_t *client_id;

        DHCPLease *lease;

        int pool_offset;

        if (size < sizeof(DHCPMessage))

                return 0;

        assert_se(sd_dhcp_server_new(&server, 1) >= 0);

        server->fd = open("/dev/null", O_RDWR|O_CLOEXEC|O_NOCTTY);

        assert_se(server->fd >= 0);

        assert_se(sd_dhcp_server_configure_pool(server, &address, 24, 0, 0) >= 0);

        /* add a lease to the pool to expose additional code paths */

        client_id = malloc(2);

        assert_se(client_id);

        client_id[0] = 2;

        client_id[1] = 2;

        lease = new0(DHCPLease, 1);

        assert_se(lease);

        lease->client_id.length = 2;

        lease->client_id.data = client_id;

        lease->address = htobe32(UINT32_C(10) << 24 | UINT32_C(2));

        lease->gateway = htobe32(UINT32_C(10) << 24 | UINT32_C(1));

        lease->expiration = UINT64_MAX;

        memcpy(lease->chaddr, chaddr, 16);

        pool_offset = get_pool_offset(server, lease->address);

        server->bound_leases[pool_offset] = lease;

        assert_se(hashmap_put(server->leases_by_client_id, &lease->client_id, lease) >= 0);

        (void) dhcp_server_handle_message(server, (DHCPMessage*)data, size);

        return 0;

}