/*      $OpenBSD: sys_socket.c,v 1.68 2025/02/13 12:39:15 bluhm Exp $   */
/*      $NetBSD: sys_socket.c,v 1.13 1995/08/12 23:59:09 mycroft Exp $  */

/*
 * Copyright (c) 1982, 1986, 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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 University 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 REGENTS 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 REGENTS 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.
 *
 *      @(#)sys_socket.c        8.1 (Berkeley) 6/10/93
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/proc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/fcntl.h>

#include <net/if.h>

const struct fileops socketops = {
        .fo_read        = soo_read,
        .fo_write       = soo_write,
        .fo_ioctl       = soo_ioctl,
        .fo_kqfilter    = soo_kqfilter,
        .fo_stat        = soo_stat,
        .fo_close       = soo_close
};

int
soo_read(struct file *fp, struct uio *uio, int fflags)
{
        struct socket *so = (struct socket *)fp->f_data;
        int flags = 0;

        if (fp->f_flag & FNONBLOCK)
                flags |= MSG_DONTWAIT;

        return (soreceive(so, NULL, uio, NULL, NULL, &flags, 0));
}

int
soo_write(struct file *fp, struct uio *uio, int fflags)
{
        struct socket *so = (struct socket *)fp->f_data;
        int flags = 0;

        if (fp->f_flag & FNONBLOCK)
                flags |= MSG_DONTWAIT;

        return (sosend(so, NULL, uio, NULL, NULL, flags));
}

int
soo_ioctl(struct file *fp, u_long cmd, caddr_t data, struct proc *p)
{
        struct socket *so = (struct socket *)fp->f_data;

        switch (cmd) {

        case FIOASYNC:
                mtx_enter(&so->so_rcv.sb_mtx);
                mtx_enter(&so->so_snd.sb_mtx);
                if (*(int *)data) {
                        so->so_rcv.sb_flags |= SB_ASYNC;
                        so->so_snd.sb_flags |= SB_ASYNC;
                } else {
                        so->so_rcv.sb_flags &= ~SB_ASYNC;
                        so->so_snd.sb_flags &= ~SB_ASYNC;
                }
                mtx_leave(&so->so_snd.sb_mtx);
                mtx_leave(&so->so_rcv.sb_mtx);
                break;

        case FIONREAD:
                *(int *)data = so->so_rcv.sb_datacc;
                break;

        case FIOSETOWN:
        case SIOCSPGRP:
        case TIOCSPGRP:
                return sigio_setown(&so->so_sigio, cmd, data);

        case FIOGETOWN:
        case SIOCGPGRP:
        case TIOCGPGRP:
                sigio_getown(&so->so_sigio, cmd, data);
                break;

        case SIOCATMARK:
                *(int *)data = (so->so_rcv.sb_state & SS_RCVATMARK) != 0;
                break;

        default:
                /*
                 * Interface/routing/protocol specific ioctls:
                 * interface and routing ioctls should have a
                 * different entry since a socket's unnecessary
                 */
                if (IOCGROUP(cmd) == 'i')
                        return ifioctl(so, cmd, data, p);
                if (IOCGROUP(cmd) == 'r')
                        return (EOPNOTSUPP);
                return pru_control(so, cmd, data, NULL);
        }

        return (0);
}

int
soo_stat(struct file *fp, struct stat *ub, struct proc *p)
{
        struct socket *so = fp->f_data;

        memset(ub, 0, sizeof (*ub));
        ub->st_mode = S_IFSOCK;
        solock_shared(so);
        mtx_enter(&so->so_rcv.sb_mtx);
        if ((so->so_rcv.sb_state & SS_CANTRCVMORE) == 0 ||
            so->so_rcv.sb_cc != 0)
                ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
        mtx_leave(&so->so_rcv.sb_mtx);
        mtx_enter(&so->so_snd.sb_mtx);
        if ((so->so_snd.sb_state & SS_CANTSENDMORE) == 0)
                ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
        mtx_leave(&so->so_snd.sb_mtx);
        ub->st_uid = so->so_euid;
        ub->st_gid = so->so_egid;
        (void)pru_sense(so, ub);
        sounlock_shared(so);
        return (0);
}

int
soo_close(struct file *fp, struct proc *p)
{
        int flags, error = 0;

        if (fp->f_data) {
                flags = (fp->f_flag & FNONBLOCK) ? MSG_DONTWAIT : 0;
                error = soclose(fp->f_data, flags);
        }
        fp->f_data = NULL;
        return (error);
}