mirror of
https://github.com/alsa-project/alsa-lib.git
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605 lines
14 KiB
C
605 lines
14 KiB
C
/*
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* Control - SHM Client
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* Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/shm.h>
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#include <sys/socket.h>
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#include <sys/poll.h>
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#include <sys/un.h>
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#include <sys/uio.h>
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#include <sys/mman.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include "aserver.h"
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typedef struct {
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int socket;
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volatile snd_ctl_shm_ctrl_t *ctrl;
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} snd_ctl_shm_t;
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static int snd_ctl_shm_action(snd_ctl_t *ctl)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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int err;
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char buf[1];
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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err = write(shm->socket, buf, 1);
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if (err != 1)
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return -EBADFD;
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err = read(shm->socket, buf, 1);
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if (err != 1)
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return -EBADFD;
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if (ctrl->cmd) {
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SNDERR("Server has not done the cmd");
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return -EBADFD;
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}
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return ctrl->result;
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}
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static int snd_ctl_shm_action_fd(snd_ctl_t *ctl, int *fd)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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int err;
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char buf[1];
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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err = write(shm->socket, buf, 1);
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if (err != 1)
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return -EBADFD;
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err = receive_fd(shm->socket, buf, 1, fd);
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if (err != 1)
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return -EBADFD;
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if (ctrl->cmd) {
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SNDERR("Server has not done the cmd");
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return -EBADFD;
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}
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return ctrl->result;
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}
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static int snd_ctl_shm_close(snd_ctl_t *ctl)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int result;
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ctrl->cmd = SND_CTL_IOCTL_CLOSE;
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result = snd_ctl_shm_action(ctl);
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shmdt((void *)ctrl);
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close(shm->socket);
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free(shm);
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return result;
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}
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static int snd_ctl_shm_nonblock(snd_ctl_t *handle ATTRIBUTE_UNUSED, int nonblock ATTRIBUTE_UNUSED)
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{
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return 0;
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}
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static int snd_ctl_shm_async(snd_ctl_t *ctl, int sig, pid_t pid)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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ctrl->cmd = SND_CTL_IOCTL_ASYNC;
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ctrl->u.async.sig = sig;
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if (pid == 0)
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pid = getpid();
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ctrl->u.async.pid = pid;
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return snd_ctl_shm_action(ctl);
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}
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static int snd_ctl_shm_poll_descriptor(snd_ctl_t *ctl)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int fd, err;
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ctrl->cmd = SND_CTL_IOCTL_POLL_DESCRIPTOR;
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err = snd_ctl_shm_action_fd(ctl, &fd);
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if (err < 0)
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return err;
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return fd;
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}
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static int snd_ctl_shm_subscribe_events(snd_ctl_t *ctl, int subscribe)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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ctrl->cmd = SND_CTL_IOCTL_POLL_DESCRIPTOR;
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ctrl->u.subscribe_events = subscribe;
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return snd_ctl_shm_action(ctl);
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}
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static int snd_ctl_shm_card_info(snd_ctl_t *ctl, snd_ctl_card_info_t *info)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int err;
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// ctrl->u.card_info = *info;
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ctrl->cmd = SNDRV_CTL_IOCTL_CARD_INFO;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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*info = ctrl->u.card_info;
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return err;
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}
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static int snd_ctl_shm_elem_list(snd_ctl_t *ctl, snd_ctl_elem_list_t *list)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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size_t maxsize = CTL_SHM_DATA_MAXLEN;
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size_t bytes = list->space * sizeof(*list->pids);
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int err;
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snd_ctl_elem_id_t *pids = list->pids;
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if (bytes > maxsize)
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return -EINVAL;
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ctrl->u.element_list = *list;
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ctrl->cmd = SNDRV_CTL_IOCTL_ELEM_LIST;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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*list = ctrl->u.element_list;
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list->pids = pids;
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bytes = list->used * sizeof(*list->pids);
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memcpy(pids, (void *)ctrl->data, bytes);
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return err;
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}
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static int snd_ctl_shm_elem_info(snd_ctl_t *ctl, snd_ctl_elem_info_t *info)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int err;
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ctrl->u.element_info = *info;
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ctrl->cmd = SNDRV_CTL_IOCTL_ELEM_INFO;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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*info = ctrl->u.element_info;
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return err;
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}
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static int snd_ctl_shm_elem_read(snd_ctl_t *ctl, snd_ctl_elem_value_t *control)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int err;
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ctrl->u.element_read = *control;
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ctrl->cmd = SNDRV_CTL_IOCTL_ELEM_READ;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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*control = ctrl->u.element_read;
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return err;
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}
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static int snd_ctl_shm_elem_write(snd_ctl_t *ctl, snd_ctl_elem_value_t *control)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int err;
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ctrl->u.element_write = *control;
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ctrl->cmd = SNDRV_CTL_IOCTL_ELEM_WRITE;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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*control = ctrl->u.element_write;
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return err;
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}
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static int snd_ctl_shm_hwdep_next_device(snd_ctl_t *ctl, int * device)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int err;
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ctrl->u.device = *device;
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ctrl->cmd = SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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*device = ctrl->u.device;
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return err;
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}
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static int snd_ctl_shm_hwdep_info(snd_ctl_t *ctl, snd_hwdep_info_t * info)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int err;
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ctrl->u.hwdep_info = *info;
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ctrl->cmd = SNDRV_CTL_IOCTL_HWDEP_INFO;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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*info = ctrl->u.hwdep_info;
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return err;
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}
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static int snd_ctl_shm_pcm_next_device(snd_ctl_t *ctl, int * device)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int err;
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ctrl->u.device = *device;
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ctrl->cmd = SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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*device = ctrl->u.device;
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return err;
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}
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static int snd_ctl_shm_pcm_info(snd_ctl_t *ctl, snd_pcm_info_t * info)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int err;
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ctrl->u.pcm_info = *info;
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ctrl->cmd = SNDRV_CTL_IOCTL_PCM_INFO;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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*info = ctrl->u.pcm_info;
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return err;
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}
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static int snd_ctl_shm_pcm_prefer_subdevice(snd_ctl_t *ctl, int subdev)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int err;
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ctrl->u.pcm_prefer_subdevice = subdev;
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ctrl->cmd = SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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return err;
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}
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static int snd_ctl_shm_rawmidi_next_device(snd_ctl_t *ctl, int * device)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int err;
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ctrl->u.device = *device;
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ctrl->cmd = SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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*device = ctrl->u.device;
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return err;
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}
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static int snd_ctl_shm_rawmidi_info(snd_ctl_t *ctl, snd_rawmidi_info_t * info)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int err;
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ctrl->u.rawmidi_info = *info;
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ctrl->cmd = SNDRV_CTL_IOCTL_RAWMIDI_INFO;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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*info = ctrl->u.rawmidi_info;
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return err;
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}
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static int snd_ctl_shm_rawmidi_prefer_subdevice(snd_ctl_t *ctl, int subdev)
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{
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snd_ctl_shm_t *shm = ctl->private_data;
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volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
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int err;
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ctrl->u.rawmidi_prefer_subdevice = subdev;
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ctrl->cmd = SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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return err;
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}
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static int snd_ctl_shm_read(snd_ctl_t *ctl, snd_ctl_event_t *event)
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{
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snd_ctl_shm_t *shm;
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volatile snd_ctl_shm_ctrl_t *ctrl;
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int err;
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err = snd_ctl_wait(ctl, -1);
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if (err < 0)
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return 0;
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shm = ctl->private_data;
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ctrl = shm->ctrl;
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ctrl->u.read = *event;
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ctrl->cmd = SND_CTL_IOCTL_READ;
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err = snd_ctl_shm_action(ctl);
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if (err < 0)
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return err;
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*event = ctrl->u.read;
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return err;
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}
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snd_ctl_ops_t snd_ctl_shm_ops = {
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close: snd_ctl_shm_close,
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nonblock: snd_ctl_shm_nonblock,
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async: snd_ctl_shm_async,
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poll_descriptor: snd_ctl_shm_poll_descriptor,
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subscribe_events: snd_ctl_shm_subscribe_events,
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card_info: snd_ctl_shm_card_info,
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element_list: snd_ctl_shm_elem_list,
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element_info: snd_ctl_shm_elem_info,
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element_read: snd_ctl_shm_elem_read,
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element_write: snd_ctl_shm_elem_write,
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hwdep_next_device: snd_ctl_shm_hwdep_next_device,
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hwdep_info: snd_ctl_shm_hwdep_info,
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pcm_next_device: snd_ctl_shm_pcm_next_device,
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pcm_info: snd_ctl_shm_pcm_info,
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pcm_prefer_subdevice: snd_ctl_shm_pcm_prefer_subdevice,
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rawmidi_next_device: snd_ctl_shm_rawmidi_next_device,
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rawmidi_info: snd_ctl_shm_rawmidi_info,
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rawmidi_prefer_subdevice: snd_ctl_shm_rawmidi_prefer_subdevice,
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read: snd_ctl_shm_read,
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};
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static int make_local_socket(const char *filename)
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{
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size_t l = strlen(filename);
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size_t size = offsetof(struct sockaddr_un, sun_path) + l;
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struct sockaddr_un *addr = alloca(size);
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int sock;
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sock = socket(PF_LOCAL, SOCK_STREAM, 0);
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if (sock < 0)
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return -errno;
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addr->sun_family = AF_LOCAL;
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memcpy(addr->sun_path, filename, l);
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if (connect(sock, (struct sockaddr *) addr, size) < 0)
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return -errno;
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return sock;
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}
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#if 0
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static int make_inet_socket(const char *host, int port)
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{
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struct sockaddr_in addr;
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int sock;
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struct hostent *h = gethostbyname(host);
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if (!h)
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return -ENOENT;
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sock = socket(PF_INET, SOCK_STREAM, 0);
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if (sock < 0)
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return -errno;
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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memcpy(&addr.sin_addr, h->h_addr_list[0], sizeof(struct in_addr));
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if (connect(sock, (struct sockaddr *) &addr, sizeof(addr)) < 0)
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return -errno;
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return sock;
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}
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#endif
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int snd_ctl_shm_open(snd_ctl_t **handlep, const char *name, const char *sockname, const char *sname, int mode)
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{
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snd_ctl_t *ctl;
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snd_ctl_shm_t *shm = NULL;
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snd_client_open_request_t *req;
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snd_client_open_answer_t ans;
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size_t snamelen, reqlen;
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int err;
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int result;
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int sock = -1;
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snd_ctl_shm_ctrl_t *ctrl = NULL;
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snamelen = strlen(sname);
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if (snamelen > 255)
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return -EINVAL;
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result = make_local_socket(sockname);
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if (result < 0) {
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SNDERR("server for socket %s is not running", sockname);
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goto _err;
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}
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sock = result;
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reqlen = sizeof(*req) + snamelen;
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req = alloca(reqlen);
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memcpy(req->name, sname, snamelen);
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req->dev_type = SND_DEV_TYPE_CONTROL;
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req->transport_type = SND_TRANSPORT_TYPE_SHM;
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req->stream = 0;
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req->mode = mode;
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req->namelen = snamelen;
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err = write(sock, req, reqlen);
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if (err < 0) {
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SNDERR("write error");
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result = -errno;
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goto _err;
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}
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if ((size_t) err != reqlen) {
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SNDERR("write size error");
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result = -EINVAL;
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goto _err;
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}
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err = read(sock, &ans, sizeof(ans));
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if (err < 0) {
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SNDERR("read error");
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result = -errno;
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goto _err;
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}
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if (err != sizeof(ans)) {
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SNDERR("read size error");
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result = -EINVAL;
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goto _err;
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}
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result = ans.result;
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if (result < 0)
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goto _err;
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ctrl = shmat(ans.cookie, 0, 0);
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if (!ctrl) {
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result = -errno;
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goto _err;
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}
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ctl = calloc(1, sizeof(snd_ctl_t));
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if (!ctl) {
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result = -ENOMEM;
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goto _err;
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}
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shm = calloc(1, sizeof(snd_ctl_shm_t));
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if (!shm) {
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free(ctl);
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result = -ENOMEM;
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goto _err;
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}
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shm->socket = sock;
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shm->ctrl = ctrl;
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if (name)
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ctl->name = strdup(name);
|
|
ctl->type = SND_CTL_TYPE_SHM;
|
|
ctl->ops = &snd_ctl_shm_ops;
|
|
ctl->private_data = shm;
|
|
*handlep = ctl;
|
|
return 0;
|
|
|
|
_err:
|
|
close(sock);
|
|
if (ctrl)
|
|
shmdt(ctrl);
|
|
if (shm)
|
|
free(shm);
|
|
return result;
|
|
}
|
|
|
|
int _snd_ctl_shm_open(snd_ctl_t **handlep, char *name, snd_config_t *conf, int mode)
|
|
{
|
|
snd_config_iterator_t i, next;
|
|
const char *server = NULL;
|
|
const char *sname = NULL;
|
|
snd_config_t *sconfig;
|
|
const char *host = NULL;
|
|
const char *sockname = NULL;
|
|
long port = -1;
|
|
int err;
|
|
int local;
|
|
struct hostent *h;
|
|
snd_config_for_each(i, next, conf) {
|
|
snd_config_t *n = snd_config_iterator_entry(i);
|
|
const char *id = snd_config_get_id(n);
|
|
if (strcmp(id, "comment") == 0)
|
|
continue;
|
|
if (strcmp(id, "type") == 0)
|
|
continue;
|
|
if (strcmp(id, "server") == 0) {
|
|
err = snd_config_get_string(n, &server);
|
|
if (err < 0) {
|
|
SNDERR("Invalid type for %s", id);
|
|
return -EINVAL;
|
|
}
|
|
continue;
|
|
}
|
|
if (strcmp(id, "sname") == 0) {
|
|
err = snd_config_get_string(n, &sname);
|
|
if (err < 0) {
|
|
SNDERR("Invalid type for %s", id);
|
|
return -EINVAL;
|
|
}
|
|
continue;
|
|
}
|
|
SNDERR("Unknown field %s", id);
|
|
return -EINVAL;
|
|
}
|
|
if (!sname) {
|
|
SNDERR("sname is not defined");
|
|
return -EINVAL;
|
|
}
|
|
if (!server) {
|
|
SNDERR("server is not defined");
|
|
return -EINVAL;
|
|
}
|
|
err = snd_config_search_alias(snd_config, "server", server, &sconfig);
|
|
if (err < 0) {
|
|
SNDERR("Unknown server %s", server);
|
|
return -EINVAL;
|
|
}
|
|
if (snd_config_get_type(sconfig) != SND_CONFIG_TYPE_COMPOUND) {
|
|
SNDERR("Invalid type for server %s definition", server);
|
|
return -EINVAL;
|
|
}
|
|
snd_config_for_each(i, next, conf) {
|
|
snd_config_t *n = snd_config_iterator_entry(i);
|
|
const char *id = snd_config_get_id(n);
|
|
if (strcmp(id, "comment") == 0)
|
|
continue;
|
|
if (strcmp(id, "host") == 0) {
|
|
err = snd_config_get_string(n, &host);
|
|
if (err < 0) {
|
|
SNDERR("Invalid type for %s", id);
|
|
return -EINVAL;
|
|
}
|
|
continue;
|
|
}
|
|
if (strcmp(id, "socket") == 0) {
|
|
err = snd_config_get_string(n, &sockname);
|
|
if (err < 0) {
|
|
SNDERR("Invalid type for %s", id);
|
|
return -EINVAL;
|
|
}
|
|
continue;
|
|
}
|
|
if (strcmp(id, "port") == 0) {
|
|
err = snd_config_get_integer(n, &port);
|
|
if (err < 0) {
|
|
SNDERR("Invalid type for %s", id);
|
|
return -EINVAL;
|
|
}
|
|
continue;
|
|
}
|
|
SNDERR("Unknown field %s", id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!host) {
|
|
SNDERR("host is not defined");
|
|
return -EINVAL;
|
|
}
|
|
if (!sockname) {
|
|
SNDERR("socket is not defined");
|
|
return -EINVAL;
|
|
}
|
|
h = gethostbyname(host);
|
|
if (!h) {
|
|
SNDERR("Cannot resolve %s", host);
|
|
return -EINVAL;
|
|
}
|
|
local = is_local(h);
|
|
if (!local) {
|
|
SNDERR("%s is not the local host", host);
|
|
return -EINVAL;
|
|
}
|
|
return snd_ctl_shm_open(handlep, name, sockname, sname, mode);
|
|
}
|
|
|