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avctp.c
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avctp.c
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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2006-2010 Nokia Corporation
* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
* Copyright (C) 2011 Texas Instruments, Inc.
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; 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 <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <glib.h>
#include "lib/bluetooth.h"
#include "lib/sdp.h"
#include "lib/l2cap.h"
#include "lib/uuid.h"
#include "btio/btio.h"
#include "src/adapter.h"
#include "src/device.h"
#include "src/log.h"
#include "src/error.h"
#include "src/uinput.h"
#include "avctp.h"
#include "avrcp.h"
/* AV/C Panel 1.23, page 76:
* command with the pressed value is valid for two seconds
*/
#define AVC_PRESS_TIMEOUT 2
#define QUIRK_NO_RELEASE 1 << 0
/* Message types */
#define AVCTP_COMMAND 0
#define AVCTP_RESPONSE 1
/* Packet types */
#define AVCTP_PACKET_SINGLE 0
#define AVCTP_PACKET_START 1
#define AVCTP_PACKET_CONTINUE 2
#define AVCTP_PACKET_END 3
#if __BYTE_ORDER == __LITTLE_ENDIAN
struct avctp_header {
uint8_t ipid:1;
uint8_t cr:1;
uint8_t packet_type:2;
uint8_t transaction:4;
uint16_t pid;
} __attribute__ ((packed));
#define AVCTP_HEADER_LENGTH 3
struct avc_header {
uint8_t code:4;
uint8_t _hdr0:4;
uint8_t subunit_id:3;
uint8_t subunit_type:5;
uint8_t opcode;
} __attribute__ ((packed));
#elif __BYTE_ORDER == __BIG_ENDIAN
struct avctp_header {
uint8_t transaction:4;
uint8_t packet_type:2;
uint8_t cr:1;
uint8_t ipid:1;
uint16_t pid;
} __attribute__ ((packed));
#define AVCTP_HEADER_LENGTH 3
struct avc_header {
uint8_t _hdr0:4;
uint8_t code:4;
uint8_t subunit_type:5;
uint8_t subunit_id:3;
uint8_t opcode;
} __attribute__ ((packed));
#else
#error "Unknown byte order"
#endif
struct avctp_state_callback {
avctp_state_cb cb;
struct btd_device *dev;
unsigned int id;
void *user_data;
};
struct avctp_server {
struct btd_adapter *adapter;
GIOChannel *control_io;
GIOChannel *browsing_io;
GSList *sessions;
};
struct avctp_control_req {
struct avctp_pending_req *p;
uint8_t code;
uint8_t subunit;
uint8_t op;
uint8_t *operands;
uint16_t operand_count;
avctp_rsp_cb func;
void *user_data;
};
struct avctp_browsing_req {
struct avctp_pending_req *p;
uint8_t *operands;
uint16_t operand_count;
avctp_browsing_rsp_cb func;
void *user_data;
};
typedef int (*avctp_process_cb) (void *data);
struct avctp_pending_req {
struct avctp_channel *chan;
uint8_t transaction;
guint timeout;
int err;
avctp_process_cb process;
void *data;
GDestroyNotify destroy;
};
struct avctp_channel {
struct avctp *session;
GIOChannel *io;
uint8_t transaction;
guint watch;
uint16_t imtu;
uint16_t omtu;
uint8_t *buffer;
GSList *handlers;
struct avctp_pending_req *p;
GQueue *queue;
GSList *processed;
guint process_id;
GDestroyNotify destroy;
};
struct key_pressed {
uint16_t op;
guint timer;
};
struct avctp {
struct avctp_server *server;
struct btd_device *device;
avctp_state_t state;
int uinput;
guint auth_id;
unsigned int passthrough_id;
unsigned int unit_id;
unsigned int subunit_id;
struct avctp_channel *control;
struct avctp_channel *browsing;
struct avctp_passthrough_handler *handler;
uint8_t key_quirks[256];
struct key_pressed key;
bool initiator;
};
struct avctp_passthrough_handler {
avctp_passthrough_cb cb;
void *user_data;
unsigned int id;
};
struct avctp_pdu_handler {
uint8_t opcode;
avctp_control_pdu_cb cb;
void *user_data;
unsigned int id;
};
struct avctp_browsing_pdu_handler {
avctp_browsing_pdu_cb cb;
void *user_data;
unsigned int id;
GDestroyNotify destroy;
};
static struct {
const char *name;
uint8_t avc;
uint16_t uinput;
} key_map[] = {
{ "SELECT", AVC_SELECT, KEY_SELECT },
{ "UP", AVC_UP, KEY_UP },
{ "DOWN", AVC_DOWN, KEY_DOWN },
{ "LEFT", AVC_LEFT, KEY_LEFT },
{ "RIGHT", AVC_RIGHT, KEY_RIGHT },
{ "ROOT MENU", AVC_ROOT_MENU, KEY_MENU },
{ "CONTENTS MENU", AVC_CONTENTS_MENU, KEY_PROGRAM },
{ "FAVORITE MENU", AVC_FAVORITE_MENU, KEY_FAVORITES },
{ "EXIT", AVC_EXIT, KEY_EXIT },
{ "ON DEMAND MENU", AVC_ON_DEMAND_MENU, KEY_MENU },
{ "APPS MENU", AVC_APPS_MENU, KEY_MENU },
{ "0", AVC_0, KEY_0 },
{ "1", AVC_1, KEY_1 },
{ "2", AVC_2, KEY_2 },
{ "3", AVC_3, KEY_3 },
{ "4", AVC_4, KEY_4 },
{ "5", AVC_5, KEY_5 },
{ "6", AVC_6, KEY_6 },
{ "7", AVC_7, KEY_7 },
{ "8", AVC_8, KEY_8 },
{ "9", AVC_9, KEY_9 },
{ "DOT", AVC_DOT, KEY_DOT },
{ "ENTER", AVC_ENTER, KEY_ENTER },
{ "CHANNEL UP", AVC_CHANNEL_UP, KEY_CHANNELUP },
{ "CHANNEL DOWN", AVC_CHANNEL_DOWN, KEY_CHANNELDOWN },
{ "CHANNEL PREVIOUS", AVC_CHANNEL_PREVIOUS, KEY_LAST },
{ "INPUT SELECT", AVC_INPUT_SELECT, KEY_CONFIG },
{ "INFO", AVC_INFO, KEY_INFO },
{ "HELP", AVC_HELP, KEY_HELP },
{ "POWER", AVC_POWER, KEY_POWER2 },
{ "VOLUME UP", AVC_VOLUME_UP, KEY_VOLUMEUP },
{ "VOLUME DOWN", AVC_VOLUME_DOWN, KEY_VOLUMEDOWN },
{ "MUTE", AVC_MUTE, KEY_MUTE },
{ "PLAY", AVC_PLAY, KEY_PLAYCD },
{ "STOP", AVC_STOP, KEY_STOPCD },
{ "PAUSE", AVC_PAUSE, KEY_PAUSECD },
{ "FORWARD", AVC_FORWARD, KEY_NEXTSONG },
{ "BACKWARD", AVC_BACKWARD, KEY_PREVIOUSSONG },
{ "RECORD", AVC_RECORD, KEY_RECORD },
{ "REWIND", AVC_REWIND, KEY_REWIND },
{ "FAST FORWARD", AVC_FAST_FORWARD, KEY_FASTFORWARD },
{ "LIST", AVC_LIST, KEY_LIST },
{ "F1", AVC_F1, KEY_F1 },
{ "F2", AVC_F2, KEY_F2 },
{ "F3", AVC_F3, KEY_F3 },
{ "F4", AVC_F4, KEY_F4 },
{ "F5", AVC_F5, KEY_F5 },
{ "F6", AVC_F6, KEY_F6 },
{ "F7", AVC_F7, KEY_F7 },
{ "F8", AVC_F8, KEY_F8 },
{ "F9", AVC_F9, KEY_F9 },
{ "RED", AVC_RED, KEY_RED },
{ "GREEN", AVC_GREEN, KEY_GREEN },
{ "BLUE", AVC_BLUE, KEY_BLUE },
{ "YELLOW", AVC_YELLOW, KEY_YELLOW },
{ NULL }
};
static GSList *callbacks = NULL;
static GSList *servers = NULL;
static void auth_cb(DBusError *derr, void *user_data);
static gboolean process_queue(gpointer user_data);
static gboolean avctp_passthrough_rsp(struct avctp *session, uint8_t code,
uint8_t subunit, uint8_t *operands,
size_t operand_count, void *user_data);
static int send_event(int fd, uint16_t type, uint16_t code, int32_t value)
{
struct uinput_event event;
memset(&event, 0, sizeof(event));
event.type = type;
event.code = code;
event.value = value;
return write(fd, &event, sizeof(event));
}
static void send_key(int fd, uint16_t key, int pressed)
{
if (fd < 0)
return;
send_event(fd, EV_KEY, key, pressed);
send_event(fd, EV_SYN, SYN_REPORT, 0);
}
static gboolean auto_release(gpointer user_data)
{
struct avctp *session = user_data;
session->key.timer = 0;
DBG("AV/C: key press timeout");
send_key(session->uinput, session->key.op, 0);
return FALSE;
}
static void handle_press(struct avctp *session, uint16_t op)
{
if (session->key.timer > 0) {
g_source_remove(session->key.timer);
/* Only auto release if keys are different */
if (session->key.op == op)
goto done;
send_key(session->uinput, session->key.op, 0);
}
session->key.op = op;
send_key(session->uinput, op, 1);
done:
session->key.timer = g_timeout_add_seconds(AVC_PRESS_TIMEOUT,
auto_release, session);
}
static void handle_release(struct avctp *session, uint16_t op)
{
if (session->key.timer > 0) {
g_source_remove(session->key.timer);
session->key.timer = 0;
}
send_key(session->uinput, op, 0);
}
static size_t handle_panel_passthrough(struct avctp *session,
uint8_t transaction, uint8_t *code,
uint8_t *subunit, uint8_t *operands,
size_t operand_count, void *user_data)
{
struct avctp_passthrough_handler *handler = session->handler;
const char *status;
int pressed, i;
if (*code != AVC_CTYPE_CONTROL || *subunit != AVC_SUBUNIT_PANEL) {
*code = AVC_CTYPE_REJECTED;
return operand_count;
}
if (operand_count == 0)
goto done;
if (operands[0] & 0x80) {
status = "released";
pressed = 0;
} else {
status = "pressed";
pressed = 1;
}
if (session->key.timer == 0 && handler != NULL) {
if (handler->cb(session, operands[0] & 0x7F,
pressed, handler->user_data))
goto done;
}
for (i = 0; key_map[i].name != NULL; i++) {
uint8_t key_quirks;
if ((operands[0] & 0x7F) != key_map[i].avc)
continue;
DBG("AV/C: %s %s", key_map[i].name, status);
key_quirks = session->key_quirks[key_map[i].avc];
if (key_quirks & QUIRK_NO_RELEASE) {
if (!pressed) {
DBG("AV/C: Ignoring release");
break;
}
DBG("AV/C: treating key press as press + release");
send_key(session->uinput, key_map[i].uinput, 1);
send_key(session->uinput, key_map[i].uinput, 0);
break;
}
if (pressed)
handle_press(session, key_map[i].uinput);
else
handle_release(session, key_map[i].uinput);
break;
}
if (key_map[i].name == NULL) {
DBG("AV/C: unknown button 0x%02X %s",
operands[0] & 0x7F, status);
*code = AVC_CTYPE_NOT_IMPLEMENTED;
return operand_count;
}
done:
*code = AVC_CTYPE_ACCEPTED;
return operand_count;
}
static size_t handle_unit_info(struct avctp *session,
uint8_t transaction, uint8_t *code,
uint8_t *subunit, uint8_t *operands,
size_t operand_count, void *user_data)
{
if (*code != AVC_CTYPE_STATUS) {
*code = AVC_CTYPE_REJECTED;
return 0;
}
*code = AVC_CTYPE_STABLE;
/* The first operand should be 0x07 for the UNITINFO response.
* Neither AVRCP (section 22.1, page 117) nor AVC Digital
* Interface Command Set (section 9.2.1, page 45) specs
* explain this value but both use it */
if (operand_count >= 1)
operands[0] = 0x07;
if (operand_count >= 2)
operands[1] = AVC_SUBUNIT_PANEL << 3;
DBG("reply to AVC_OP_UNITINFO");
return operand_count;
}
static size_t handle_subunit_info(struct avctp *session,
uint8_t transaction, uint8_t *code,
uint8_t *subunit, uint8_t *operands,
size_t operand_count, void *user_data)
{
if (*code != AVC_CTYPE_STATUS) {
*code = AVC_CTYPE_REJECTED;
return 0;
}
*code = AVC_CTYPE_STABLE;
/* The first operand should be 0x07 for the UNITINFO response.
* Neither AVRCP (section 22.1, page 117) nor AVC Digital
* Interface Command Set (section 9.2.1, page 45) specs
* explain this value but both use it */
if (operand_count >= 2)
operands[1] = AVC_SUBUNIT_PANEL << 3;
DBG("reply to AVC_OP_SUBUNITINFO");
return operand_count;
}
static struct avctp_pdu_handler *find_handler(GSList *list, uint8_t opcode)
{
for (; list; list = list->next) {
struct avctp_pdu_handler *handler = list->data;
if (handler->opcode == opcode)
return handler;
}
return NULL;
}
static void pending_destroy(gpointer data, gpointer user_data)
{
struct avctp_pending_req *req = data;
if (req->destroy)
req->destroy(req->data);
if (req->timeout > 0)
g_source_remove(req->timeout);
g_free(req);
}
static void avctp_channel_destroy(struct avctp_channel *chan)
{
g_io_channel_shutdown(chan->io, TRUE, NULL);
g_io_channel_unref(chan->io);
if (chan->watch)
g_source_remove(chan->watch);
if (chan->p)
pending_destroy(chan->p, NULL);
if (chan->process_id > 0)
g_source_remove(chan->process_id);
if (chan->destroy)
chan->destroy(chan);
g_free(chan->buffer);
g_queue_foreach(chan->queue, pending_destroy, NULL);
g_queue_free(chan->queue);
g_slist_foreach(chan->processed, pending_destroy, NULL);
g_slist_free(chan->processed);
g_slist_free_full(chan->handlers, g_free);
g_free(chan);
}
static void avctp_disconnected(struct avctp *session)
{
struct avctp_server *server;
if (!session)
return;
if (session->browsing)
avctp_channel_destroy(session->browsing);
if (session->control)
avctp_channel_destroy(session->control);
if (session->auth_id != 0) {
btd_cancel_authorization(session->auth_id);
session->auth_id = 0;
}
if (session->key.timer > 0)
g_source_remove(session->key.timer);
if (session->uinput >= 0) {
char address[18];
ba2str(device_get_address(session->device), address);
DBG("AVCTP: closing uinput for %s", address);
ioctl(session->uinput, UI_DEV_DESTROY);
close(session->uinput);
session->uinput = -1;
}
server = session->server;
server->sessions = g_slist_remove(server->sessions, session);
btd_device_unref(session->device);
g_free(session);
}
static void avctp_set_state(struct avctp *session, avctp_state_t new_state,
int err)
{
GSList *l;
avctp_state_t old_state = session->state;
session->state = new_state;
for (l = callbacks; l != NULL; l = l->next) {
struct avctp_state_callback *cb = l->data;
if (cb->dev && cb->dev != session->device)
continue;
cb->cb(session->device, old_state, new_state, err,
cb->user_data);
}
switch (new_state) {
case AVCTP_STATE_DISCONNECTED:
DBG("AVCTP Disconnected");
avctp_disconnected(session);
break;
case AVCTP_STATE_CONNECTING:
DBG("AVCTP Connecting");
break;
case AVCTP_STATE_CONNECTED:
DBG("AVCTP Connected");
break;
case AVCTP_STATE_BROWSING_CONNECTING:
DBG("AVCTP Browsing Connecting");
break;
case AVCTP_STATE_BROWSING_CONNECTED:
DBG("AVCTP Browsing Connected");
break;
default:
error("Invalid AVCTP state %d", new_state);
return;
}
}
static int avctp_send(struct avctp_channel *control, uint8_t transaction,
uint8_t cr, uint8_t code,
uint8_t subunit, uint8_t opcode,
uint8_t *operands, size_t operand_count)
{
struct avctp_header *avctp;
struct avc_header *avc;
struct msghdr msg;
struct iovec iov[2];
int sk, err = 0;
iov[0].iov_base = control->buffer;
iov[0].iov_len = sizeof(*avctp) + sizeof(*avc);
iov[1].iov_base = operands;
iov[1].iov_len = operand_count;
if (control->omtu < (iov[0].iov_len + iov[1].iov_len))
return -EOVERFLOW;
sk = g_io_channel_unix_get_fd(control->io);
memset(control->buffer, 0, iov[0].iov_len);
avctp = (void *) control->buffer;
avc = (void *) avctp + sizeof(*avctp);
avctp->transaction = transaction;
avctp->packet_type = AVCTP_PACKET_SINGLE;
avctp->cr = cr;
avctp->pid = htons(AV_REMOTE_SVCLASS_ID);
avc->code = code;
avc->subunit_type = subunit;
avc->opcode = opcode;
memset(&msg, 0, sizeof(msg));
msg.msg_iov = iov;
msg.msg_iovlen = 2;
if (sendmsg(sk, &msg, 0) < 0)
err = -errno;
return err;
}
static int avctp_browsing_send(struct avctp_channel *browsing,
uint8_t transaction, uint8_t cr,
uint8_t *operands, size_t operand_count)
{
struct avctp_header *avctp;
struct msghdr msg;
struct iovec iov[2];
int sk, err = 0;
iov[0].iov_base = browsing->buffer;
iov[0].iov_len = sizeof(*avctp);
iov[1].iov_base = operands;
iov[1].iov_len = operand_count;
if (browsing->omtu < (iov[0].iov_len + iov[1].iov_len))
return -EOVERFLOW;
sk = g_io_channel_unix_get_fd(browsing->io);
memset(browsing->buffer, 0, iov[0].iov_len);
avctp = (void *) browsing->buffer;
avctp->transaction = transaction;
avctp->packet_type = AVCTP_PACKET_SINGLE;
avctp->cr = cr;
avctp->pid = htons(AV_REMOTE_SVCLASS_ID);
memset(&msg, 0, sizeof(msg));
msg.msg_iov = iov;
msg.msg_iovlen = 2;
if (sendmsg(sk, &msg, 0) < 0)
err = -errno;
return err;
}
static void control_req_destroy(void *data)
{
struct avctp_control_req *req = data;
struct avctp_pending_req *p = req->p;
struct avctp *session = p->chan->session;
if (p->err == 0 || req->func == NULL)
goto done;
req->func(session, AVC_CTYPE_REJECTED, req->subunit, NULL, 0,
req->user_data);
done:
g_free(req->operands);
g_free(req);
}
static void browsing_req_destroy(void *data)
{
struct avctp_browsing_req *req = data;
struct avctp_pending_req *p = req->p;
struct avctp *session = p->chan->session;
if (p->err == 0 || req->func == NULL)
goto done;
req->func(session, NULL, 0, req->user_data);
done:
g_free(req->operands);
g_free(req);
}
static gboolean req_timeout(gpointer user_data)
{
struct avctp_channel *chan = user_data;
struct avctp_pending_req *p = chan->p;
DBG("transaction %u", p->transaction);
p->timeout = 0;
p->err = -ETIMEDOUT;
pending_destroy(p, NULL);
chan->p = NULL;
if (chan->process_id == 0)
chan->process_id = g_idle_add(process_queue, chan);
return FALSE;
}
static int process_control(void *data)
{
struct avctp_control_req *req = data;
struct avctp_pending_req *p = req->p;
return avctp_send(p->chan, p->transaction, AVCTP_COMMAND, req->code,
req->subunit, req->op,
req->operands, req->operand_count);
}
static int process_browsing(void *data)
{
struct avctp_browsing_req *req = data;
struct avctp_pending_req *p = req->p;
return avctp_browsing_send(p->chan, p->transaction, AVCTP_COMMAND,
req->operands, req->operand_count);
}
static gboolean process_queue(void *user_data)
{
struct avctp_channel *chan = user_data;
struct avctp_pending_req *p = chan->p;
chan->process_id = 0;
if (p != NULL)
return FALSE;
while ((p = g_queue_pop_head(chan->queue))) {
if (p->process(p->data) == 0)
break;
pending_destroy(p, NULL);
}
if (p == NULL)
return FALSE;
chan->p = p;
p->timeout = g_timeout_add_seconds(2, req_timeout, chan);
return FALSE;
}
static void control_response(struct avctp_channel *control,
struct avctp_header *avctp,
struct avc_header *avc,
uint8_t *operands,
size_t operand_count)
{
struct avctp_pending_req *p = control->p;
struct avctp_control_req *req;
GSList *l;
if (p && p->transaction == avctp->transaction) {
control->processed = g_slist_prepend(control->processed, p);
if (p->timeout > 0) {
g_source_remove(p->timeout);
p->timeout = 0;
}
control->p = NULL;
if (control->process_id == 0)
control->process_id = g_idle_add(process_queue,
control);
}
for (l = control->processed; l; l = l->next) {
p = l->data;
req = p->data;
if (p->transaction != avctp->transaction)
continue;
if (req->func && req->func(control->session, avc->code,
avc->subunit_type,
operands, operand_count,
req->user_data))
return;
control->processed = g_slist_remove(control->processed, p);
pending_destroy(p, NULL);
return;
}
}
static void browsing_response(struct avctp_channel *browsing,
struct avctp_header *avctp,
uint8_t *operands,
size_t operand_count)
{
struct avctp_pending_req *p = browsing->p;
struct avctp_browsing_req *req;
GSList *l;
if (p && p->transaction == avctp->transaction) {
browsing->processed = g_slist_prepend(browsing->processed, p);
if (p->timeout > 0) {
g_source_remove(p->timeout);
p->timeout = 0;
}
browsing->p = NULL;
if (browsing->process_id == 0)
browsing->process_id = g_idle_add(process_queue,
browsing);
}
for (l = browsing->processed; l; l = l->next) {
p = l->data;
req = p->data;
if (p->transaction != avctp->transaction)
continue;
if (req->func && req->func(browsing->session, operands,
operand_count, req->user_data))
return;
browsing->processed = g_slist_remove(browsing->processed, p);
pending_destroy(p, NULL);
return;
}
}
static gboolean session_browsing_cb(GIOChannel *chan, GIOCondition cond,
gpointer data)
{
struct avctp *session = data;
struct avctp_channel *browsing = session->browsing;
uint8_t *buf = browsing->buffer;
uint8_t *operands;
struct avctp_header *avctp;
int sock, ret, packet_size, operand_count;
struct avctp_browsing_pdu_handler *handler;
if (cond & (G_IO_ERR | G_IO_HUP | G_IO_NVAL))
goto failed;
sock = g_io_channel_unix_get_fd(chan);
ret = read(sock, buf, browsing->imtu);
if (ret <= 0)
goto failed;
avctp = (struct avctp_header *) buf;
if (avctp->packet_type != AVCTP_PACKET_SINGLE)
goto failed;
operands = buf + AVCTP_HEADER_LENGTH;
ret -= AVCTP_HEADER_LENGTH;
operand_count = ret;
if (avctp->cr == AVCTP_RESPONSE) {
browsing_response(browsing, avctp, operands, operand_count);
return TRUE;
}
packet_size = AVCTP_HEADER_LENGTH;
avctp->cr = AVCTP_RESPONSE;
handler = g_slist_nth_data(browsing->handlers, 0);
if (handler == NULL) {
DBG("handler not found");
packet_size += avrcp_browsing_general_reject(operands);
goto send;
}
packet_size += handler->cb(session, avctp->transaction,
operands, operand_count,
handler->user_data);
send:
if (packet_size != 0) {
ret = write(sock, buf, packet_size);
if (ret != packet_size)
goto failed;
}
return TRUE;
failed:
DBG("AVCTP Browsing: disconnected");
avctp_set_state(session, AVCTP_STATE_CONNECTED, 0);
if (session->browsing) {
avctp_channel_destroy(session->browsing);
session->browsing = NULL;
}
return FALSE;
}
static gboolean session_cb(GIOChannel *chan, GIOCondition cond, gpointer data)
{
struct avctp *session = data;
struct avctp_channel *control = session->control;
uint8_t *buf = control->buffer;
uint8_t *operands, code, subunit;
struct avctp_header *avctp;
struct avc_header *avc;
int ret, packet_size, operand_count, sock;
struct avctp_pdu_handler *handler;
if (cond & (G_IO_ERR | G_IO_HUP | G_IO_NVAL))
goto failed;
sock = g_io_channel_unix_get_fd(chan);
ret = read(sock, buf, control->imtu);
if (ret <= 0)
goto failed;
if (ret < AVCTP_HEADER_LENGTH) {
error("Too small AVCTP packet");
goto failed;
}
avctp = (struct avctp_header *) buf;
ret -= AVCTP_HEADER_LENGTH;
if (ret < AVC_HEADER_LENGTH) {
error("Too small AVC packet");
goto failed;
}
avc = (struct avc_header *) (buf + AVCTP_HEADER_LENGTH);
ret -= AVC_HEADER_LENGTH;
operands = (uint8_t *) avc + AVC_HEADER_LENGTH;
operand_count = ret;
if (avctp->cr == AVCTP_RESPONSE) {
control_response(control, avctp, avc, operands, operand_count);
return TRUE;
}
packet_size = AVCTP_HEADER_LENGTH + AVC_HEADER_LENGTH;