M7350/external/bluetooth/bluez/android/ipc.c
2024-09-09 08:57:42 +00:00

427 lines
9.1 KiB
C

/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2013-2014 Intel Corporation. All rights reserved.
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stddef.h>
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <signal.h>
#include <stdbool.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <glib.h>
#include "ipc-common.h"
#include "ipc.h"
#include "src/log.h"
struct ipc {
struct service_handler *services;
int service_max;
const char *path;
size_t size;
GIOChannel *cmd_io;
guint cmd_watch;
bool notifications;
GIOChannel *notif_io;
guint notif_watch;
ipc_disconnect_cb disconnect_cb;
void *disconnect_cb_data;
};
static void ipc_disconnect(struct ipc *ipc, bool in_cleanup)
{
if (ipc->cmd_watch) {
g_source_remove(ipc->cmd_watch);
ipc->cmd_watch = 0;
}
if (ipc->cmd_io) {
g_io_channel_shutdown(ipc->cmd_io, TRUE, NULL);
g_io_channel_unref(ipc->cmd_io);
ipc->cmd_io = NULL;
}
if (ipc->notif_watch) {
g_source_remove(ipc->notif_watch);
ipc->notif_watch = 0;
}
if (ipc->notif_io) {
g_io_channel_shutdown(ipc->notif_io, TRUE, NULL);
g_io_channel_unref(ipc->notif_io);
ipc->notif_io = NULL;
}
if (in_cleanup)
return;
if (ipc->disconnect_cb)
ipc->disconnect_cb(ipc->disconnect_cb_data);
}
static int ipc_handle_msg(struct service_handler *handlers, size_t max_index,
const void *buf, ssize_t len)
{
const struct ipc_hdr *msg = buf;
const struct ipc_handler *handler;
if (len < (ssize_t) sizeof(*msg)) {
DBG("message too small (%zd bytes)", len);
return -EBADMSG;
}
if (len != (ssize_t) (sizeof(*msg) + msg->len)) {
DBG("message malformed (%zd bytes)", len);
return -EBADMSG;
}
/* if service is valid */
if (msg->service_id > max_index) {
DBG("unknown service (0x%x)", msg->service_id);
return -EOPNOTSUPP;
}
/* if service is registered */
if (!handlers[msg->service_id].handler) {
DBG("service not registered (0x%x)", msg->service_id);
return -EOPNOTSUPP;
}
/* if opcode is valid */
if (msg->opcode == IPC_OP_STATUS ||
msg->opcode > handlers[msg->service_id].size) {
DBG("invalid opcode 0x%x for service 0x%x", msg->opcode,
msg->service_id);
return -EOPNOTSUPP;
}
/* opcode is table offset + 1 */
handler = &handlers[msg->service_id].handler[msg->opcode - 1];
/* if payload size is valid */
if ((handler->var_len && handler->data_len > msg->len) ||
(!handler->var_len && handler->data_len != msg->len)) {
DBG("invalid size for opcode 0x%x service 0x%x",
msg->opcode, msg->service_id);
return -EMSGSIZE;
}
handler->handler(msg->payload, msg->len);
return 0;
}
static gboolean cmd_watch_cb(GIOChannel *io, GIOCondition cond,
gpointer user_data)
{
struct ipc *ipc = user_data;
char buf[IPC_MTU];
ssize_t ret;
int fd, err;
if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
info("IPC: command socket closed");
ipc->cmd_watch = 0;
goto fail;
}
fd = g_io_channel_unix_get_fd(io);
ret = read(fd, buf, sizeof(buf));
if (ret < 0) {
error("IPC: command read failed (%s)", strerror(errno));
goto fail;
}
err = ipc_handle_msg(ipc->services, ipc->service_max, buf, ret);
if (err < 0) {
error("IPC: failed to handle message (%s)", strerror(-err));
goto fail;
}
return TRUE;
fail:
ipc_disconnect(ipc, false);
return FALSE;
}
static gboolean notif_watch_cb(GIOChannel *io, GIOCondition cond,
gpointer user_data)
{
struct ipc *ipc = user_data;
info("IPC: notification socket closed");
ipc->notif_watch = 0;
ipc_disconnect(ipc, false);
return FALSE;
}
static GIOChannel *ipc_connect(const char *path, size_t size,
GIOFunc connect_cb, void *user_data)
{
struct sockaddr_un addr;
GIOCondition cond;
GIOChannel *io;
int sk;
sk = socket(PF_LOCAL, SOCK_SEQPACKET, 0);
if (sk < 0) {
error("IPC: failed to create socket: %d (%s)", errno,
strerror(errno));
return NULL;
}
io = g_io_channel_unix_new(sk);
g_io_channel_set_close_on_unref(io, TRUE);
g_io_channel_set_flags(io, G_IO_FLAG_NONBLOCK, NULL);
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
memcpy(addr.sun_path, path, size);
connect(sk, (struct sockaddr *) &addr, sizeof(addr));
cond = G_IO_OUT | G_IO_ERR | G_IO_HUP | G_IO_NVAL;
g_io_add_watch(io, cond, connect_cb, user_data);
return io;
}
static gboolean notif_connect_cb(GIOChannel *io, GIOCondition cond,
gpointer user_data)
{
struct ipc *ipc = user_data;
DBG("");
if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
error("IPC: notification socket connect failed");
ipc_disconnect(ipc, false);
return FALSE;
}
cond = G_IO_ERR | G_IO_HUP | G_IO_NVAL;
ipc->notif_watch = g_io_add_watch(io, cond, notif_watch_cb, ipc);
cond = G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL;
ipc->cmd_watch = g_io_add_watch(ipc->cmd_io, cond, cmd_watch_cb, ipc);
info("IPC: successfully connected (with notifications)");
return FALSE;
}
static gboolean cmd_connect_cb(GIOChannel *io, GIOCondition cond,
gpointer user_data)
{
struct ipc *ipc = user_data;
DBG("");
if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
error("IPC: command socket connect failed");
ipc_disconnect(ipc, false);
return FALSE;
}
if (ipc->notifications) {
ipc->notif_io = ipc_connect(ipc->path, ipc->size,
notif_connect_cb, ipc);
if (!ipc->notif_io)
ipc_disconnect(ipc, false);
return FALSE;
}
cond = G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL;
ipc->cmd_watch = g_io_add_watch(ipc->cmd_io, cond, cmd_watch_cb, ipc);
info("IPC: successfully connected (without notifications)");
return FALSE;
}
struct ipc *ipc_init(const char *path, size_t size, int max_service_id,
bool notifications,
ipc_disconnect_cb cb, void *cb_data)
{
struct ipc *ipc;
ipc = g_new0(struct ipc, 1);
ipc->services = g_new0(struct service_handler, max_service_id + 1);
ipc->service_max = max_service_id;
ipc->path = path;
ipc->size = size;
ipc->notifications = notifications;
ipc->cmd_io = ipc_connect(path, size, cmd_connect_cb, ipc);
if (!ipc->cmd_io) {
g_free(ipc->services);
g_free(ipc);
return NULL;
}
ipc->disconnect_cb = cb;
ipc->disconnect_cb_data = cb_data;
return ipc;
}
void ipc_cleanup(struct ipc *ipc)
{
ipc_disconnect(ipc, true);
g_free(ipc->services);
g_free(ipc);
}
static void ipc_send(int sk, uint8_t service_id, uint8_t opcode, uint16_t len,
void *param, int fd)
{
struct msghdr msg;
struct iovec iv[2];
struct ipc_hdr m;
char cmsgbuf[CMSG_SPACE(sizeof(int))];
struct cmsghdr *cmsg;
memset(&msg, 0, sizeof(msg));
memset(&m, 0, sizeof(m));
memset(cmsgbuf, 0, sizeof(cmsgbuf));
m.service_id = service_id;
m.opcode = opcode;
m.len = len;
iv[0].iov_base = &m;
iv[0].iov_len = sizeof(m);
iv[1].iov_base = param;
iv[1].iov_len = len;
msg.msg_iov = iv;
msg.msg_iovlen = 2;
if (fd >= 0) {
msg.msg_control = cmsgbuf;
msg.msg_controllen = sizeof(cmsgbuf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
/* Initialize the payload */
memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
}
if (sendmsg(sk, &msg, 0) < 0) {
error("IPC send failed :%s", strerror(errno));
/* TODO disconnect IPC here when this function becomes static */
raise(SIGTERM);
}
}
void ipc_send_rsp(struct ipc *ipc, uint8_t service_id, uint8_t opcode,
uint8_t status)
{
struct ipc_status s;
int sk;
sk = g_io_channel_unix_get_fd(ipc->cmd_io);
if (status == IPC_STATUS_SUCCESS) {
ipc_send(sk, service_id, opcode, 0, NULL, -1);
return;
}
s.code = status;
ipc_send(sk, service_id, IPC_OP_STATUS, sizeof(s), &s, -1);
}
void ipc_send_rsp_full(struct ipc *ipc, uint8_t service_id, uint8_t opcode,
uint16_t len, void *param, int fd)
{
ipc_send(g_io_channel_unix_get_fd(ipc->cmd_io), service_id, opcode, len,
param, fd);
}
void ipc_send_notif(struct ipc *ipc, uint8_t service_id, uint8_t opcode,
uint16_t len, void *param)
{
if (!ipc || !ipc->notif_io)
return;
ipc_send(g_io_channel_unix_get_fd(ipc->notif_io), service_id, opcode,
len, param, -1);
}
void ipc_register(struct ipc *ipc, uint8_t service,
const struct ipc_handler *handlers, uint8_t size)
{
if (service > ipc->service_max)
return;
ipc->services[service].handler = handlers;
ipc->services[service].size = size;
}
void ipc_unregister(struct ipc *ipc, uint8_t service)
{
if (service > ipc->service_max)
return;
ipc->services[service].handler = NULL;
ipc->services[service].size = 0;
}