// SPDX-License-Identifier: GPL-2.0
/* Copyright Amazon.com Inc. or its affiliates. */

#include <sys/socket.h>
#include <netinet/in.h>

#include "kselftest_harness.h"

FIXTURE(bind_timewait)
{
        struct sockaddr_in addr;
        socklen_t addrlen;
};

FIXTURE_VARIANT(bind_timewait)
{
        __u32 addr_const;
};

FIXTURE_VARIANT_ADD(bind_timewait, localhost)
{
        .addr_const = INADDR_LOOPBACK
};

FIXTURE_VARIANT_ADD(bind_timewait, addrany)
{
        .addr_const = INADDR_ANY
};

FIXTURE_SETUP(bind_timewait)
{
        self->addr.sin_family = AF_INET;
        self->addr.sin_port = 0;
        self->addr.sin_addr.s_addr = htonl(variant->addr_const);
        self->addrlen = sizeof(self->addr);
}

FIXTURE_TEARDOWN(bind_timewait)
{
}

void create_timewait_socket(struct __test_metadata *_metadata,
                            FIXTURE_DATA(bind_timewait) *self)
{
        int server_fd, client_fd, child_fd, ret;
        struct sockaddr_in addr;
        socklen_t addrlen;

        server_fd = socket(AF_INET, SOCK_STREAM, 0);
        ASSERT_GT(server_fd, 0);

        ret = bind(server_fd, (struct sockaddr *)&self->addr, self->addrlen);
        ASSERT_EQ(ret, 0);

        ret = listen(server_fd, 1);
        ASSERT_EQ(ret, 0);

        ret = getsockname(server_fd, (struct sockaddr *)&self->addr, &self->addrlen);
        ASSERT_EQ(ret, 0);

        client_fd = socket(AF_INET, SOCK_STREAM, 0);
        ASSERT_GT(client_fd, 0);

        ret = connect(client_fd, (struct sockaddr *)&self->addr, self->addrlen);
        ASSERT_EQ(ret, 0);

        addrlen = sizeof(addr);
        child_fd = accept(server_fd, (struct sockaddr *)&addr, &addrlen);
        ASSERT_GT(child_fd, 0);

        close(child_fd);
        close(client_fd);
        close(server_fd);
}

TEST_F(bind_timewait, 1)
{
        int fd, ret;

        create_timewait_socket(_metadata, self);

        fd = socket(AF_INET, SOCK_STREAM, 0);
        ASSERT_GT(fd, 0);

        ret = bind(fd, (struct sockaddr *)&self->addr, self->addrlen);
        ASSERT_EQ(ret, -1);
        ASSERT_EQ(errno, EADDRINUSE);

        close(fd);
}

TEST_HARNESS_MAIN