/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2019 The FreeBSD Foundation
 *
 * This software was developed by BFF Storage Systems, LLC under sponsorship
 * from the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

extern "C" {
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
}

#include "mockfs.hh"
#include "utils.hh"

using namespace testing;

const char FULLPATH[] = "mountpoint/some_fifo";
const char RELPATH[] = "some_fifo";
const char MESSAGE[] = "Hello, World!\n";
const int msgsize = sizeof(MESSAGE);

class Fifo: public FuseTest {
public:
pthread_t m_child;

Fifo(): m_child(NULL) {};

void TearDown() {
        if (m_child != NULL) {
                pthread_join(m_child, NULL);
        }
        FuseTest::TearDown();
}
};

class Socket: public Fifo {};

/* Writer thread */
static void* writer(void* arg) {
        ssize_t sent = 0;
        int fd;

        fd = *(int*)arg;
        while (sent < msgsize) {
                ssize_t r;

                r = write(fd, MESSAGE + sent, msgsize - sent);
                if (r < 0)
                        return (void*)(intptr_t)errno;
                else
                        sent += r;
                
        }
        return 0;
}

/* 
 * Reading and writing FIFOs works.  None of the I/O actually goes through FUSE
 */
TEST_F(Fifo, read_write)
{
        mode_t mode = S_IFIFO | 0755;
        const int bufsize = 80;
        char message[bufsize];
        ssize_t recvd = 0, r;
        uint64_t ino = 42;
        int fd;

        expect_lookup(RELPATH, ino, mode, 0, 1);

        fd = open(FULLPATH, O_RDWR);
        ASSERT_LE(0, fd) << strerror(errno);
        ASSERT_EQ(0, pthread_create(&m_child, NULL, writer, &fd))
                << strerror(errno);
        while (recvd < msgsize) {
                r = read(fd, message + recvd, bufsize - recvd);
                ASSERT_LE(0, r) << strerror(errno);
                ASSERT_LT(0, r) << "unexpected EOF";
                recvd += r;
        }
        ASSERT_STREQ(message, MESSAGE);

        leak(fd);
}

/* Writer thread */
static void* socket_writer(void* arg __unused) {
        ssize_t sent = 0;
        int fd, err;
        struct sockaddr_un sa;

        fd = socket(AF_UNIX, SOCK_STREAM, 0);
        if (fd < 0) {
                perror("socket");
                return (void*)(intptr_t)errno;
        }
        sa.sun_family = AF_UNIX;
        strlcpy(sa.sun_path, FULLPATH, sizeof(sa.sun_path));
        sa.sun_len = sizeof(FULLPATH);
        err = connect(fd, (struct sockaddr*)&sa, sizeof(sa));
        if (err < 0) {
                perror("connect");
                return (void*)(intptr_t)errno;
        }

        while (sent < msgsize) {
                ssize_t r;

                r = write(fd, MESSAGE + sent, msgsize - sent);
                if (r < 0)
                        return (void*)(intptr_t)errno;
                else
                        sent += r;
                
        }

        FuseTest::leak(fd);
        return 0;
}

/* 
 * Reading and writing unix-domain sockets works.  None of the I/O actually
 * goes through FUSE.
 */
TEST_F(Socket, read_write)
{
        mode_t mode = S_IFSOCK | 0755;
        const int bufsize = 80;
        char message[bufsize];
        struct sockaddr_un sa;
        ssize_t recvd = 0, r;
        uint64_t ino = 42;
        int fd, connected;
        Sequence seq;

        EXPECT_LOOKUP(FUSE_ROOT_ID, RELPATH)
                .WillOnce(Invoke(ReturnErrno(ENOENT)));
        EXPECT_CALL(*m_mock, process(
                ResultOf([=](auto in) {
                        return (in.header.opcode == FUSE_MKNOD);
                }, Eq(true)),
                _)
        ).InSequence(seq)
        .WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) {
                SET_OUT_HEADER_LEN(out, entry);
                out.body.entry.attr.mode = mode;
                out.body.entry.nodeid = ino;
                out.body.entry.entry_valid = UINT64_MAX;
                out.body.entry.attr_valid = UINT64_MAX;
        })));

        EXPECT_LOOKUP(FUSE_ROOT_ID, RELPATH)
        .InSequence(seq)
        .WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) {
                SET_OUT_HEADER_LEN(out, entry);
                out.body.entry.attr.mode = mode;
                out.body.entry.nodeid = ino;
                out.body.entry.attr.nlink = 1;
                out.body.entry.attr_valid = UINT64_MAX;
                out.body.entry.entry_valid = UINT64_MAX;
        })));

        fd = socket(AF_UNIX, SOCK_STREAM, 0);
        ASSERT_LE(0, fd) << strerror(errno);
        sa.sun_family = AF_UNIX;
        strlcpy(sa.sun_path, FULLPATH, sizeof(sa.sun_path));
        sa.sun_len = sizeof(FULLPATH);
        ASSERT_EQ(0, bind(fd, (struct sockaddr*)&sa, sizeof(sa)))
                << strerror(errno);
        listen(fd, 5);
        ASSERT_EQ(0, pthread_create(&m_child, NULL, socket_writer, NULL))
                << strerror(errno);
        connected = accept(fd, 0, 0);
        ASSERT_LE(0, connected) << strerror(errno);

        while (recvd < msgsize) {
                r = read(connected, message + recvd, bufsize - recvd);
                ASSERT_LE(0, r) << strerror(errno);
                ASSERT_LT(0, r) << "unexpected EOF";
                recvd += r;
        }
        ASSERT_STREQ(message, MESSAGE);

        leak(fd);
}