/*
 * Copyright (c) 2010 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Alex Hornung <ahornung@gmail.com>
 *
 * 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.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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.
 */
#include <sys/types.h>
#include <sys/device.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <regex.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>

#include <libprop/proplib.h>
#include <sys/udev.h>
#include "udevd.h"

int
send_xml(int s, char *xml)
{
        ssize_t r,n;
        size_t sz;

        sz = strlen(xml) + 1;

        r = send(s, &sz, sizeof(sz), 0);
        if (r <= 0)
                return r;

        r = 0;
        while (r < (ssize_t)sz) {
                n = send(s, xml+r, sz-r, 0);
                if (n <= 0)
                        return n;
                r += n;
        }

        return r;
}

int
read_xml(int s, char **buf)
{
        char *xml;
        size_t sz;
        int n, r;

        *buf = NULL;

        n = recv(s, &sz, sizeof(sz), MSG_WAITALL);
        if ((n <= 0) || (sz > 12*1024*1024)) /* Arbitrary limit */
                return n;

        xml = malloc(sz+2);     
        r = 0;
        while (r < (ssize_t)sz) {
                n = recv(s, xml+r, sz-r, MSG_WAITALL);
                if (n <= 0) {
                        free(xml);
                        return n;
                }
                r += n;
        }

        *buf = xml;
        return r;
}

int
unblock_descriptor(int s)
{
        int flags, ret;

        flags = fcntl(s, F_GETFL, 0);
        ret = fcntl(s, F_SETFL, flags | O_NONBLOCK);
        return ret;
}

int
block_descriptor(int s)
{
        int flags, ret;

        flags = fcntl(s, F_GETFL, 0);
        ret = fcntl(s, F_SETFL, flags & ~O_NONBLOCK);
        return ret;
}

int
init_local_server(const char *sockfile, int socktype, int nonblock)
{
        mode_t msk;
        int s;
        struct sockaddr_un un_addr;

        if ((s = socket(AF_UNIX, socktype, 0)) < 0)
                return -1;

        memset(&un_addr, 0, sizeof(un_addr));
        un_addr.sun_family = AF_UNIX;
        strncpy(un_addr.sun_path, sockfile, SOCKFILE_NAMELEN);
        un_addr.sun_path[SOCKFILE_NAMELEN - 1] = '\0';

        /*
         * DO NOT change `un_addr.sun_path' to `sockfile' here,
         * since `sockfile' may have been truncated by above strncpy(3).
         */
        unlink(un_addr.sun_path);

        if (nonblock && unblock_descriptor(s) < 0) {
                close(s);
                return -1;
        }

        msk = umask(S_IXUSR|S_IXGRP|S_IXOTH);
        if (bind(s, (struct sockaddr *)&un_addr, sizeof(un_addr)) < 0) {
                close(s);
                return -1;
        }
        umask(msk);      /* Restore the original mask */

        if (socktype == SOCK_STREAM && listen(s, LOCAL_BACKLOG) < 0) {
                close(s);
                return -1;
        }

        return s;
}