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gerrit-public.fairphone.software / fp2-dev / platform / external / qemu / e36a683b547e540c68bf9c5578e05b29c8676f47 / . / android / hw-qemud.c
blob: 79040f7b307bf9589607f0daa8668b9d9939c373 [file] [log] [blame]
/* Copyright (C) 2007-2008 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** 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.
*/
#include "android/hw-qemud.h"
#include "android/utils/debug.h"
#include "android/utils/misc.h"
#include "android/utils/system.h"
#include "android/utils/bufprint.h"
#include "android/looper.h"
#include "hw/hw.h"
#include "hw/android/goldfish/pipe.h"
#include "sysemu/char.h"
#include "android/charpipe.h"
#include "android/cbuffer.h"
#include "utils/panic.h"
#define D(...) VERBOSE_PRINT(qemud,__VA_ARGS__)
#define D_ACTIVE VERBOSE_CHECK(qemud)
/* the T(...) macro is used to dump traffic */
#define T_ACTIVE 0
#if T_ACTIVE
#define T(...) VERBOSE_PRINT(qemud,__VA_ARGS__)
#else
#define T(...) ((void)0)
#endif
/* max serial MTU. Don't change this without modifying
* development/emulator/qemud/qemud.c as well.
*/
#define MAX_SERIAL_PAYLOAD 4000
/* max framed data payload. Must be < (1 << 16)
*/
#define MAX_FRAME_PAYLOAD 65535
/* Version number of snapshots code. Increment whenever the data saved
* or the layout in which it is saved is changed.
*/
#define QEMUD_SAVE_VERSION 2
#ifndef min
#define min(a, b) (((a) < (b)) ? (a) : (b))
#endif
/* define SUPPORT_LEGACY_QEMUD to 1 if you want to support
* talking to a legacy qemud daemon. See docs/ANDROID-QEMUD.TXT
* for details.
*/
#ifdef TARGET_ARM
#define SUPPORT_LEGACY_QEMUD 1
#endif
#ifdef TARGET_I386
#define SUPPORT_LEGACY_QEMUD 0 /* no legacy support */
#endif
#if SUPPORT_LEGACY_QEMUD
#include "telephony/android_modem.h"
#include "telephony/modem_driver.h"
#endif
/*
* This implements support for the 'qemud' multiplexing communication
* channel between clients running in the emulated system and 'services'
* provided by the emulator.
*
* For additional details, please read docs/ANDROID-QEMUD.TXT
*
*/
/*
* IMPLEMENTATION DETAILS:
*
* We use one charpipe to connect the emulated serial port to the 'QemudSerial'
* object. This object is used to receive data from the serial port, and
* unframe messages (i.e. extract payload length + channel id from header,
* then the payload itself), before sending them to a generic receiver.
*
* The QemudSerial object can also be used to send messages to the daemon
* through the serial port (see qemud_serial_send())
*
* The multiplexer is connected to one or more 'service' objects.
* are themselves connected through a charpipe to an emulated device or
* control sub-module in the emulator.
*
* tty <==charpipe==> QemudSerial ---> QemudMultiplexer ----> QemudClient
* ^ |
* | |
* +--------------------------------------+
*
*/
/** HANDLING INCOMING DATA FRAMES
**/
/* A QemudSink is just a handly data structure that is used to
* read a fixed amount of bytes into a buffer
*/
typedef struct QemudSink {
int used; /* number of bytes already used */
int size; /* total number of bytes in buff */
uint8_t* buff;
} QemudSink;
/* save the state of a QemudSink to a snapshot.
*
* The buffer pointer is not saved, since it usually points to buffer
* fields in other structs, which have save functions themselves. It
* is up to the caller to make sure the buffer is correctly saved and
* restored.
*/
static void
qemud_sink_save(QEMUFile* f, QemudSink* s)
{
qemu_put_be32(f, s->used);
qemu_put_be32(f, s->size);
}
/* load the state of a QemudSink from a snapshot.
*/
static int
qemud_sink_load(QEMUFile* f, QemudSink* s)
{
s->used = qemu_get_be32(f);
s->size = qemu_get_be32(f);
return 0;
}
/* reset a QemudSink, i.e. provide a new destination buffer address
* and its size in bytes.
*/
static void
qemud_sink_reset( QemudSink* ss, int size, uint8_t* buffer )
{
ss->used = 0;
ss->size = size;
ss->buff = buffer;
}
/* try to fill the sink by reading bytes from the source buffer
* '*pmsg' which contains '*plen' bytes
*
* this functions updates '*pmsg' and '*plen', and returns
* 1 if the sink's destination buffer is full, or 0 otherwise.
*/
static int
qemud_sink_fill( QemudSink* ss, const uint8_t* *pmsg, int *plen)
{
int avail = ss->size - ss->used;
if (avail <= 0)
return 1;
if (avail > *plen)
avail = *plen;
memcpy(ss->buff + ss->used, *pmsg, avail);
*pmsg += avail;
*plen -= avail;
ss->used += avail;
return (ss->used == ss->size);
}
/* returns the number of bytes needed to fill a sink's destination
* buffer.
*/
static int
qemud_sink_needed( QemudSink* ss )
{
return ss->size - ss->used;
}
/** HANDLING SERIAL PORT CONNECTION
**/
/* The QemudSerial object receives data from the serial port charpipe.
* It parses the header to extract the channel id and payload length,
* then the message itself.
*
* Incoming messages are sent to a generic receiver identified by
* the 'recv_opaque' and 'recv_func' parameters to qemud_serial_init()
*
* It also provides qemud_serial_send() which can be used to send
* messages back through the serial port.
*/
#define HEADER_SIZE 6
#define LENGTH_OFFSET 2
#define LENGTH_SIZE 4
#define CHANNEL_OFFSET 0
#define CHANNEL_SIZE 2
#if SUPPORT_LEGACY_QEMUD
typedef enum {
QEMUD_VERSION_UNKNOWN,
QEMUD_VERSION_LEGACY,
QEMUD_VERSION_NORMAL
} QemudVersion;
# define LEGACY_LENGTH_OFFSET 0
# define LEGACY_CHANNEL_OFFSET 4
#endif
/* length of the framed header */
#define FRAME_HEADER_SIZE 4
#define BUFFER_SIZE MAX_SERIAL_PAYLOAD
/* out of convenience, the incoming message is zero-terminated
* and can be modified by the receiver (e.g. for tokenization).
*/
typedef void (*QemudSerialReceive)( void* opaque, int channel, uint8_t* msg, int msglen);
typedef struct QemudSerial {
CharDriverState* cs; /* serial charpipe endpoint */
/* managing incoming packets from the serial port */
ABool need_header;
int overflow;
int in_size;
int in_channel;
#if SUPPORT_LEGACY_QEMUD
QemudVersion version;
#endif
QemudSink header[1];
QemudSink payload[1];
uint8_t data0[MAX_SERIAL_PAYLOAD+1];
/* receiver */
QemudSerialReceive recv_func; /* receiver callback */
void* recv_opaque; /* receiver user-specific data */
} QemudSerial;
/* Save the state of a QemudSerial to a snapshot file.
*/
static void
qemud_serial_save(QEMUFile* f, QemudSerial* s)
{
/* cs, recv_func and recv_opaque are not saved, as these are assigned only
* during emulator init. A load within a session can re-use the values
* already assigned, a newly launched emulator has freshly assigned values.
*/
/* state of incoming packets from the serial port */
qemu_put_be32(f, s->need_header);
qemu_put_be32(f, s->overflow);
qemu_put_be32(f, s->in_size);
qemu_put_be32(f, s->in_channel);
#if SUPPORT_LEGACY_QEMUD
qemu_put_be32(f, s->version);
#endif
qemud_sink_save(f, s->header);
qemud_sink_save(f, s->payload);
qemu_put_be32(f, MAX_SERIAL_PAYLOAD+1);
qemu_put_buffer(f, s->data0, MAX_SERIAL_PAYLOAD+1);
}
/* Load the state of a QemudSerial from a snapshot file.
*/
static int
qemud_serial_load(QEMUFile* f, QemudSerial* s)
{
/* state of incoming packets from the serial port */
s->need_header = qemu_get_be32(f);
s->overflow = qemu_get_be32(f);
s->in_size = qemu_get_be32(f);
s->in_channel = qemu_get_be32(f);
#if SUPPORT_LEGACY_QEMUD
s->version = qemu_get_be32(f);
#endif
qemud_sink_load(f, s->header);
qemud_sink_load(f, s->payload);
/* s->header and s->payload are only ever connected to s->data0 */
s->header->buff = s->payload->buff = s->data0;
int len = qemu_get_be32(f);
if (len - 1 > MAX_SERIAL_PAYLOAD) {
D("%s: load failed: size of saved payload buffer (%d) exceeds "
"current maximum (%d)\n",
__FUNCTION__, len - 1, MAX_SERIAL_PAYLOAD);
return -EIO;
}
int ret;
if ((ret = qemu_get_buffer(f, s->data0, len)) != len) {
D("%s: failed to load serial buffer contents (tried reading %d bytes, got %d)\n",
__FUNCTION__, len, ret);
return -EIO;
}
return 0;
}
/* called by the charpipe to see how much bytes can be
* read from the serial port.
*/
static int
qemud_serial_can_read( void* opaque )
{
QemudSerial* s = opaque;
if (s->overflow > 0) {
return s->overflow;
}
/* if in_size is 0, we're reading the header */
if (s->need_header)
return qemud_sink_needed(s->header);
/* otherwise, we're reading the payload */
return qemud_sink_needed(s->payload);
}
/* called by the charpipe to read data from the serial
* port. 'len' cannot be more than the value returned
* by 'qemud_serial_can_read'.
*/
static void
qemud_serial_read( void* opaque, const uint8_t* from, int len )
{
QemudSerial* s = opaque;
T("%s: received %3d bytes: '%s'", __FUNCTION__, len, quote_bytes((const void*)from, len));
while (len > 0) {
int avail;
/* skip overflow bytes */
if (s->overflow > 0) {
avail = s->overflow;
if (avail > len)
avail = len;
from += avail;
len -= avail;
continue;
}
/* read header if needed */
if (s->need_header) {
if (!qemud_sink_fill(s->header, (const uint8_t**)&from, &len))
break;
#if SUPPORT_LEGACY_QEMUD
if (s->version == QEMUD_VERSION_UNKNOWN) {
/* if we receive "001200" as the first header, then we
* detected a legacy qemud daemon. See the comments
* in qemud_serial_send_legacy_probe() for details.
*/
if ( !memcmp(s->data0, "001200", 6) ) {
D("%s: legacy qemud detected.", __FUNCTION__);
s->version = QEMUD_VERSION_LEGACY;
/* tell the modem to use legacy emulation mode */
amodem_set_legacy(android_modem);
} else {
D("%s: normal qemud detected.", __FUNCTION__);
s->version = QEMUD_VERSION_NORMAL;
}
}
if (s->version == QEMUD_VERSION_LEGACY) {
s->in_size = hex2int( s->data0 + LEGACY_LENGTH_OFFSET, LENGTH_SIZE );
s->in_channel = hex2int( s->data0 + LEGACY_CHANNEL_OFFSET, CHANNEL_SIZE );
} else {
s->in_size = hex2int( s->data0 + LENGTH_OFFSET, LENGTH_SIZE );
s->in_channel = hex2int( s->data0 + CHANNEL_OFFSET, CHANNEL_SIZE );
}
#else
/* extract payload length + channel id */
s->in_size = hex2int( s->data0 + LENGTH_OFFSET, LENGTH_SIZE );
s->in_channel = hex2int( s->data0 + CHANNEL_OFFSET, CHANNEL_SIZE );
#endif
s->header->used = 0;
if (s->in_size <= 0 || s->in_channel < 0) {
D("%s: bad header: '%.*s'", __FUNCTION__, HEADER_SIZE, s->data0);
continue;
}
if (s->in_size > MAX_SERIAL_PAYLOAD) {
D("%s: ignoring huge serial packet: length=%d channel=%1",
__FUNCTION__, s->in_size, s->in_channel);
s->overflow = s->in_size;
continue;
}
/* prepare 'in_data' for payload */
s->need_header = 0;
qemud_sink_reset(s->payload, s->in_size, s->data0);
}
/* read payload bytes */
if (!qemud_sink_fill(s->payload, &from, &len))
break;
/* zero-terminate payload, then send it to receiver */
s->payload->buff[s->payload->size] = 0;
D("%s: channel=%2d len=%3d '%s'", __FUNCTION__,
s->in_channel, s->payload->size,
quote_bytes((const void*)s->payload->buff, s->payload->size));
s->recv_func( s->recv_opaque, s->in_channel, s->payload->buff, s->payload->size );
/* prepare for new header */
s->need_header = 1;
}
}
#if SUPPORT_LEGACY_QEMUD
static void
qemud_serial_send_legacy_probe( QemudSerial* s )
{
/* we're going to send a specially crafted packet to the qemud
* daemon, this will help us determine whether we're talking
* to a legacy or a normal daemon.
*
* the trick is to known that a legacy daemon uses the following
* header:
*
* <length><channel><payload>
*
* while the normal one uses:
*
* <channel><length><payload>
*
* where <channel> is a 2-hexchar string, and <length> a 4-hexchar
* string.
*
* if we send a header of "000100", it is interpreted:
*
* - as the header of a 1-byte payload by the legacy daemon
* - as the header of a 256-byte payload by the normal one.
*
* we're going to send something that looks like:
*
* "000100" + "X" +
* "000b00" + "connect:gsm" +
* "000b00" + "connect:gps" +
* "000f00" + "connect:control" +
* "00c210" + "0"*194
*
* the normal daemon will interpret this as a 256-byte payload
* for channel 0, with garbage content ("X000b00conn...") which
* will be silently ignored.
*
* on the other hand, the legacy daemon will see it as a
* series of packets:
*
* one message "X" on channel 0, which will force the daemon
* to send back "001200ko:unknown command" as its first answer.
*
* three "connect:<xxx>" messages used to receive the channel
* numbers of the three legacy services implemented by the daemon.
*
* a garbage packet of 194 zeroes for channel 16, which will be
* silently ignored.
*/
uint8_t tab[194];
memset(tab, 0, sizeof(tab));
qemu_chr_write(s->cs, (uint8_t*)"000100X", 7);
qemu_chr_write(s->cs, (uint8_t*)"000b00connect:gsm", 17);
qemu_chr_write(s->cs, (uint8_t*)"000b00connect:gps", 17);
qemu_chr_write(s->cs, (uint8_t*)"000f00connect:control", 21);
qemu_chr_write(s->cs, (uint8_t*)"00c210", 6);
qemu_chr_write(s->cs, tab, sizeof(tab));
}
#endif /* SUPPORT_LEGACY_QEMUD */
/* intialize a QemudSerial object with a charpipe endpoint
* and a receiver.
*/
static void
qemud_serial_init( QemudSerial* s,
CharDriverState* cs,
QemudSerialReceive recv_func,
void* recv_opaque )
{
s->cs = cs;
s->recv_func = recv_func;
s->recv_opaque = recv_opaque;
s->need_header = 1;
s->overflow = 0;
qemud_sink_reset( s->header, HEADER_SIZE, s->data0 );
s->in_size = 0;
s->in_channel = -1;
#if SUPPORT_LEGACY_QEMUD
s->version = QEMUD_VERSION_UNKNOWN;
qemud_serial_send_legacy_probe(s);
#endif
qemu_chr_add_handlers( cs,
qemud_serial_can_read,
qemud_serial_read,
NULL,
s );
}
/* send a message to the serial port. This will add the necessary
* header.
*/
static void
qemud_serial_send( QemudSerial* s,
int channel,
ABool framing,
const uint8_t* msg,
int msglen )
{
uint8_t header[HEADER_SIZE];
uint8_t frame[FRAME_HEADER_SIZE];
int avail, len = msglen;
if (msglen <= 0 || channel < 0)
return;
D("%s: channel=%2d len=%3d '%s'",
__FUNCTION__, channel, msglen,
quote_bytes((const void*)msg, msglen));
if (framing) {
len += FRAME_HEADER_SIZE;
}
/* packetize the payload for the serial MTU */
while (len > 0)
{
avail = len;
if (avail > MAX_SERIAL_PAYLOAD)
avail = MAX_SERIAL_PAYLOAD;
/* write this packet's header */
#if SUPPORT_LEGACY_QEMUD
if (s->version == QEMUD_VERSION_LEGACY) {
int2hex(header + LEGACY_LENGTH_OFFSET, LENGTH_SIZE, avail);
int2hex(header + LEGACY_CHANNEL_OFFSET, CHANNEL_SIZE, channel);
} else {
int2hex(header + LENGTH_OFFSET, LENGTH_SIZE, avail);
int2hex(header + CHANNEL_OFFSET, CHANNEL_SIZE, channel);
}
#else
int2hex(header + LENGTH_OFFSET, LENGTH_SIZE, avail);
int2hex(header + CHANNEL_OFFSET, CHANNEL_SIZE, channel);
#endif
T("%s: '%.*s'", __FUNCTION__, HEADER_SIZE, header);
qemu_chr_write(s->cs, header, HEADER_SIZE);
/* insert frame header when needed */
if (framing) {
int2hex(frame, FRAME_HEADER_SIZE, msglen);
T("%s: '%.*s'", __FUNCTION__, FRAME_HEADER_SIZE, frame);
qemu_chr_write(s->cs, frame, FRAME_HEADER_SIZE);
avail -= FRAME_HEADER_SIZE;
len -= FRAME_HEADER_SIZE;
framing = 0;
}
/* write message content */
T("%s: '%.*s'", __FUNCTION__, avail, msg);
qemu_chr_write(s->cs, msg, avail);
msg += avail;
len -= avail;
}
}
/** CLIENTS
**/
/* Descriptor for a data buffer pending to be sent to a qemud pipe client.
*
* When a service decides to send data to the client, there could be cases when
* client is not ready to read them. In this case there is no GoldfishPipeBuffer
* available to write service's data to, So, we need to cache that data into the
* client descriptor, and "send" them over to the client in _qemudPipe_recvBuffers
* callback. Pending service data is stored in the client descriptor as a list
* of QemudPipeMessage instances.
*/
typedef struct QemudPipeMessage QemudPipeMessage;
struct QemudPipeMessage {
/* Message to send. */
uint8_t* message;
/* Message size. */
size_t size;
/* Offset in the message buffer of the chunk, that has not been sent
* to the pipe yet. */
size_t offset;
/* Links next message in the client. */
QemudPipeMessage* next;
};
/* A QemudClient models a single client as seen by the emulator.
* Each client has its own channel id (for the serial qemud), or pipe descriptor
* (for the pipe based qemud), and belongs to a given QemudService (see below).
*
* There is a global list of serial clients used to multiplex incoming
* messages from the channel id (see qemud_multiplexer_serial_recv()). Pipe
* clients don't need multiplexing, because they are communicated via qemud pipes
* that are unique for each client.
*
*/
/* Defines type of the client: pipe, or serial.
*/
typedef enum QemudProtocol {
/* Client is communicating via pipe. */
QEMUD_PROTOCOL_PIPE,
/* Client is communicating via serial port. */
QEMUD_PROTOCOL_SERIAL
} QemudProtocol;
/* Descriptor for a QEMUD pipe connection.
*
* Every time a client connects to the QEMUD via pipe, an instance of this
* structure is created to represent a connection used by new pipe client.
*/
typedef struct QemudPipe {
/* Pipe descriptor. */
void* hwpipe;
/* Looper used for I/O */
void* looper;
/* Service for this pipe. */
QemudService* service;
/* Client for this pipe. */
QemudClient* client;
} QemudPipe;
struct QemudClient {
/* Defines protocol, used by the client. */
QemudProtocol protocol;
/* Fields that are common for all protocols. */
char* param;
void* clie_opaque;
QemudClientRecv clie_recv;
QemudClientClose clie_close;
QemudClientSave clie_save;
QemudClientLoad clie_load;
QemudService* service;
QemudClient* next_serv; /* next in same service */
QemudClient* next;
QemudClient** pref;
/* framing support */
int framing;
ABool need_header;
ABool closing;
QemudSink header[1];
uint8_t header0[FRAME_HEADER_SIZE];
QemudSink payload[1];
/* Fields that are protocol-specific. */
union {
/* Serial-specific fields. */
struct {
int channel;
QemudSerial* serial;
} Serial;
/* Pipe-specific fields. */
struct {
QemudPipe* qemud_pipe;
QemudPipeMessage* messages;
} Pipe;
} ProtocolSelector;
};
static ABool
_is_pipe_client(QemudClient* client)
{
return (client-> protocol == QEMUD_PROTOCOL_PIPE) ? true : false;
}
static void qemud_service_remove_client( QemudService* service,
QemudClient* client );
/* remove a QemudClient from global list */
static void
qemud_client_remove( QemudClient* c )
{
c->pref[0] = c->next;
if (c->next)
c->next->pref = c->pref;
c->next = NULL;
c->pref = &c->next;
}
/* add a QemudClient to global list */
static void
qemud_client_prepend( QemudClient* c, QemudClient** plist )
{
c->next = *plist;
c->pref = plist;
*plist = c;
if (c->next)
c->next->pref = &c->next;
}
/* receive a new message from a client, and dispatch it to
* the real service implementation.
*/
static void
qemud_client_recv( void* opaque, uint8_t* msg, int msglen )
{
QemudClient* c = opaque;
/* no framing, things are simple */
if (!c->framing) {
if (c->clie_recv)
c->clie_recv( c->clie_opaque, msg, msglen, c );
return;
}
/* framing */
#if 1
/* special case, in 99% of cases, everything is in
* the incoming message, and we can do all we need
* directly without dynamic allocation.
*/
if (msglen > FRAME_HEADER_SIZE &&
c->need_header == 1 &&
qemud_sink_needed(c->header) == 0)
{
int len = hex2int( msg, FRAME_HEADER_SIZE );
if (len >= 0 && msglen == len + FRAME_HEADER_SIZE) {
if (c->clie_recv)
c->clie_recv( c->clie_opaque,
msg+FRAME_HEADER_SIZE,
msglen-FRAME_HEADER_SIZE, c );
return;
}
}
#endif
while (msglen > 0) {
uint8_t *data;
/* read the header */
if (c->need_header) {
int frame_size;
uint8_t* data;
if (!qemud_sink_fill(c->header, (const uint8_t**)&msg, &msglen))
break;
frame_size = hex2int(c->header0, 4);
if (frame_size == 0) {
D("%s: ignoring empty frame", __FUNCTION__);
continue;
}
if (frame_size < 0) {
D("%s: ignoring corrupted frame header '.*s'",
__FUNCTION__, FRAME_HEADER_SIZE, c->header0 );
continue;
}
AARRAY_NEW(data, frame_size+1); /* +1 for terminating zero */
qemud_sink_reset(c->payload, frame_size, data);
c->need_header = 0;
c->header->used = 0;
}
/* read the payload */
if (!qemud_sink_fill(c->payload, (const uint8_t**)&msg, &msglen))
break;
c->payload->buff[c->payload->size] = 0;
c->need_header = 1;
data = c->payload->buff;
/* Technically, calling 'clie_recv' can destroy client object 'c'
* if it decides to close the connection, so ensure we don't
* use/dereference it after the call. */
if (c->clie_recv)
c->clie_recv( c->clie_opaque, c->payload->buff, c->payload->size, c );
AFREE(data);
}
}
/* Sends data to a pipe-based client.
*/
static void
_qemud_pipe_send(QemudClient* client, const uint8_t* msg, int msglen);
/* Frees memory allocated for the qemud client.
*/
static void
_qemud_client_free(QemudClient* c)
{
if ( c != NULL) {
if (_is_pipe_client(c)) {
/* Free outstanding messages. */
QemudPipeMessage** msg_list = &c->ProtocolSelector.Pipe.messages;
while (*msg_list != NULL) {
QemudPipeMessage* to_free = *msg_list;
*msg_list = to_free->next;
free(to_free);
}
}
if (c->param != NULL) {
free(c->param);
}
AFREE(c);
}
}
/* disconnect a client. this automatically frees the QemudClient.
* note that this also removes the client from the global list
* and from its service's list, if any.
* Param:
* opaque - QemuClient instance
* guest_close - For pipe clients control whether or not the disconnect is
* caused by guest closing the pipe handle (in which case 1 is passed in
* this parameter). For serial clients this parameter is ignored.
*/
static void
qemud_client_disconnect( void* opaque, int guest_close )
{
QemudClient* c = opaque;
if (c->closing) { /* recursive call, exit immediately */
return;
}
if (_is_pipe_client(c) && !guest_close) {
/* This is emulator component (rather than the guest) closing a pipe
* client. Since pipe clients are controlled strictly by the guest, we
* don't actually close the client here, but notify the guest about the
* client being disconnected. Then we will do the real client close when
* the guest explicitly closes the pipe, in which case this routine will
* be called from the _qemudPipe_closeFromGuest callback with guest_close
* set to 1. */
char tmp[128], *p=tmp, *end=p+sizeof(tmp);
p = bufprint(tmp, end, "disconnect:00");
_qemud_pipe_send(c, (uint8_t*)tmp, p-tmp);
return;
}
c->closing = 1;
/* remove from current list */
qemud_client_remove(c);
if (_is_pipe_client(c)) {
/* We must NULL the client reference in the QemuPipe for this connection,
* so if a sudden receive request comes after client has been closed, we
* don't blow up. */
c->ProtocolSelector.Pipe.qemud_pipe->client = NULL;
} else if (c->ProtocolSelector.Serial.channel > 0) {
/* send a disconnect command to the daemon */
char tmp[128], *p=tmp, *end=p+sizeof(tmp);
p = bufprint(tmp, end, "disconnect:%02x",
c->ProtocolSelector.Serial.channel);
qemud_serial_send(c->ProtocolSelector.Serial.serial, 0, 0, (uint8_t*)tmp, p-tmp);
}
/* call the client close callback */
if (c->clie_close) {
c->clie_close(c->clie_opaque);
c->clie_close = NULL;
}
c->clie_recv = NULL;
/* remove from service list, if any */
if (c->service) {
qemud_service_remove_client(c->service, c);
c->service = NULL;
}
_qemud_client_free(c);
}
/* allocate a new QemudClient object
* NOTE: channel_id valie is used as a selector between serial and pipe clients.
* Since channel_id < 0 is an invalid value for a serial client, it would
* indicate that creating client is a pipe client. */
static QemudClient*
qemud_client_alloc( int channel_id,
const char* client_param,
void* clie_opaque,
QemudClientRecv clie_recv,
QemudClientClose clie_close,
QemudClientSave clie_save,
QemudClientLoad clie_load,
QemudSerial* serial,
QemudClient** pclients )
{
QemudClient* c;
ANEW0(c);
if (channel_id < 0) {
/* Allocating a pipe client. */
c->protocol = QEMUD_PROTOCOL_PIPE;
c->ProtocolSelector.Pipe.messages = NULL;
c->ProtocolSelector.Pipe.qemud_pipe = NULL;
} else {
/* Allocating a serial client. */
c->protocol = QEMUD_PROTOCOL_SERIAL;
c->ProtocolSelector.Serial.serial = serial;
c->ProtocolSelector.Serial.channel = channel_id;
}
c->param = client_param ? ASTRDUP(client_param) : NULL;
c->clie_opaque = clie_opaque;
c->clie_recv = clie_recv;
c->clie_close = clie_close;
c->clie_save = clie_save;
c->clie_load = clie_load;
c->service = NULL;
c->next_serv = NULL;
c->next = NULL;
c->framing = 0;
c->need_header = 1;
qemud_sink_reset(c->header, FRAME_HEADER_SIZE, c->header0);
qemud_client_prepend(c, pclients);
return c;
}
/* forward */
static void qemud_service_save_name( QEMUFile* f, QemudService* s );
static char* qemud_service_load_name( QEMUFile* f );
static QemudService* qemud_service_find( QemudService* service_list,
const char* service_name );
static QemudClient* qemud_service_connect_client( QemudService *sv,
int channel_id,
const char* client_param);
/* Saves the client state needed to re-establish connections on load.
* Note that we save only serial clients here. The pipe clients will be
* saved along with the pipe to which they are attached.
*/
static void
qemud_serial_client_save(QEMUFile* f, QemudClient* c)
{
/* save generic information */
qemud_service_save_name(f, c->service);
qemu_put_string(f, c->param);
qemu_put_be32(f, c->ProtocolSelector.Serial.channel);
/* save client-specific state */
if (c->clie_save)
c->clie_save(f, c, c->clie_opaque);
/* save framing configuration */
qemu_put_be32(f, c->framing);
if (c->framing) {
qemu_put_be32(f, c->need_header);
/* header sink always connected to c->header0, no need to save */
qemu_put_be32(f, FRAME_HEADER_SIZE);
qemu_put_buffer(f, c->header0, FRAME_HEADER_SIZE);
/* payload sink */
qemud_sink_save(f, c->payload);
qemu_put_buffer(f, c->payload->buff, c->payload->size);
}
}
/* Loads client state from file, then starts a new client connected to the
* corresponding service.
* Note that we load only serial clients here. The pipe clients will be
* loaded along with the pipe to which they were attached.
*/
static int
qemud_serial_client_load(QEMUFile* f, QemudService* current_services, int version )
{
char *service_name = qemud_service_load_name(f);
if (service_name == NULL)
return -EIO;
char* param = qemu_get_string(f);
/* get current service instance */
QemudService *sv = qemud_service_find(current_services, service_name);
if (sv == NULL) {
D("%s: load failed: unknown service \"%s\"\n",
__FUNCTION__, service_name);
return -EIO;
}
int channel = qemu_get_be32(f);
if (channel == 0) {
D("%s: illegal snapshot: client for control channel must no be saved\n",
__FUNCTION__);
return -EIO;
}
/* re-connect client */
QemudClient* c = qemud_service_connect_client(sv, channel, param);
if(c == NULL)
return -EIO;
/* load client-specific state */
int ret;
if (c->clie_load)
if ((ret = c->clie_load(f, c, c->clie_opaque)))
return ret; /* load failure */
/* load framing configuration */
c->framing = qemu_get_be32(f);
if (c->framing) {
/* header buffer */
c->need_header = qemu_get_be32(f);
int header_size = qemu_get_be32(f);
if (header_size > FRAME_HEADER_SIZE) {
D("%s: load failed: payload buffer requires %d bytes, %d available\n",
__FUNCTION__, header_size, FRAME_HEADER_SIZE);
return -EIO;
}
int ret;
if ((ret = qemu_get_buffer(f, c->header0, header_size)) != header_size) {
D("%s: frame header buffer load failed: expected %d bytes, got %d\n",
__FUNCTION__, header_size, ret);
return -EIO;
}
/* payload sink */
if ((ret = qemud_sink_load(f, c->payload)))
return ret;
/* replace payload buffer by saved data */
if (c->payload->buff) {
AFREE(c->payload->buff);
}
AARRAY_NEW(c->payload->buff, c->payload->size+1); /* +1 for terminating zero */
if ((ret = qemu_get_buffer(f, c->payload->buff, c->payload->size)) != c->payload->size) {
D("%s: frame payload buffer load failed: expected %d bytes, got %d\n",
__FUNCTION__, c->payload->size, ret);
AFREE(c->payload->buff);
return -EIO;
}
}
return 0;
}
/** SERVICES
**/
/* A QemudService models a _named_ service facility implemented
* by the emulator, that clients in the emulated system can connect
* to.
*
* Each service can have a limit on the number of clients they
* accept (this number if unlimited if 'max_clients' is 0).
*
* Each service maintains a list of active QemudClients and
* can also be used to create new QemudClient objects through
* its 'serv_opaque' and 'serv_connect' fields.
*/
struct QemudService {
const char* name;
int max_clients;
int num_clients;
QemudClient* clients;
QemudServiceConnect serv_connect;
QemudServiceSave serv_save;
QemudServiceLoad serv_load;
void* serv_opaque;
QemudService* next;
};
/* Create a new QemudService object */
static QemudService*
qemud_service_new( const char* name,
int max_clients,
void* serv_opaque,
QemudServiceConnect serv_connect,
QemudServiceSave serv_save,
QemudServiceLoad serv_load,
QemudService** pservices )
{
QemudService* s;
ANEW0(s);
s->name = ASTRDUP(name);
s->max_clients = max_clients;
s->num_clients = 0;
s->clients = NULL;
s->serv_opaque = serv_opaque;
s->serv_connect = serv_connect;
s->serv_save = serv_save;
s->serv_load = serv_load;
s->next = *pservices;
*pservices = s;
return s;
}
/* used internally to populate a QemudService object with a
* new QemudClient */
static void
qemud_service_add_client( QemudService* s, QemudClient* c )
{
c->service = s;
c->next_serv = s->clients;
s->clients = c;
s->num_clients += 1;
}
/* used internally to remove a QemudClient from a QemudService */
static void
qemud_service_remove_client( QemudService* s, QemudClient* c )
{
QemudClient** pnode = &s->clients;
QemudClient* node;
/* remove from clients linked-list */
for (;;) {
node = *pnode;
if (node == NULL) {
D("%s: could not find client for service '%s'",
__FUNCTION__, s->name);
return;
}
if (node == c)
break;
pnode = &node->next_serv;
}
*pnode = node->next_serv;
s->num_clients -= 1;
}
/* ask the service to create a new QemudClient. Note that we
* assume that this calls qemud_client_new() which will add
* the client to the service's list automatically.
*
* returns the client or NULL if an error occurred
*/
static QemudClient*
qemud_service_connect_client(QemudService *sv,
int channel_id,
const char* client_param)
{
QemudClient* client =
sv->serv_connect( sv->serv_opaque, sv, channel_id, client_param );
if (client == NULL) {
D("%s: registration failed for '%s' service",
__FUNCTION__, sv->name);
return NULL;
}
D("%s: registered client channel %d for '%s' service",
__FUNCTION__, channel_id, sv->name);
return client;
}
/* find a registered service by name.
*/
static QemudService*
qemud_service_find( QemudService* service_list, const char* service_name)
{
QemudService* sv = NULL;
for (sv = service_list; sv != NULL; sv = sv->next) {
if (!strcmp(sv->name, service_name)) {
break;
}
}
return sv;
}
/* Save the name of the given service.
*/
static void
qemud_service_save_name(QEMUFile* f, QemudService* s)
{
int len = strlen(s->name) + 1; // include '\0' terminator
qemu_put_be32(f, len);
qemu_put_buffer(f, (const uint8_t *) s->name, len);
}
/* Load the name of a service. Returns a pointer to the loaded name, or NULL
* on failure.
*/
static char*
qemud_service_load_name( QEMUFile* f )
{
int ret;
int name_len = qemu_get_be32(f);
char *service_name = android_alloc(name_len);
if ((ret = qemu_get_buffer(f, (uint8_t*)service_name, name_len) != name_len)) {
D("%s: service name load failed: expected %d bytes, got %d\n",
__FUNCTION__, name_len, ret);
AFREE(service_name);
return NULL;
}
if (service_name[name_len - 1] != '\0') {
char last = service_name[name_len - 1];
service_name[name_len - 1] = '\0'; /* make buffer contents printable */
D("%s: service name load failed: expecting NULL-terminated string, but "
"last char is '%c' (buffer contents: '%s%c')\n",
__FUNCTION__, name_len, last, service_name, last);
AFREE(service_name);
return NULL;
}
return service_name;
}
/* Saves state of a service.
*/
static void
qemud_service_save(QEMUFile* f, QemudService* s)
{
qemud_service_save_name(f, s);
qemu_put_be32(f, s->max_clients);
qemu_put_be32(f, s->num_clients);
if (s->serv_save)
s->serv_save(f, s, s->serv_opaque);
}
/* Loads service state from file, then updates the currently running instance
* of that service to mirror the loaded state. If the service is not running,
* the load process is aborted.
*
* Parameter 'current_services' should be the list of active services.
*/
static int
qemud_service_load( QEMUFile* f, QemudService* current_services )
{
char* service_name = qemud_service_load_name(f);
if (service_name == NULL)
return -EIO;
/* get current service instance */
QemudService *sv = qemud_service_find(current_services, service_name);
if (sv == NULL) {
D("%s: loading failed: service \"%s\" not available\n",
__FUNCTION__, service_name);
return -EIO;
}
/* reconfigure service as required */
sv->max_clients = qemu_get_be32(f);
sv->num_clients = qemu_get_be32(f);
/* load service specific data */
int ret;
if (sv->serv_load)
if ((ret = sv->serv_load(f, sv, sv->serv_opaque)))
return ret; /* load failure */
return 0;
}
/** MULTIPLEXER
**/
/* A QemudMultiplexer object maintains the global state of the
* qemud service facility. It holds a QemudSerial object to
* maintain the state of the serial port connection.
*
* The QemudMultiplexer receives all incoming messages from
* the serial port, and dispatches them to the appropriate
* QemudClient.
*
* It also has a global list of clients, and a global list of
* services.
*
* Finally, the QemudMultiplexer has a special QemudClient used
* to handle channel 0, i.e. the control channel used to handle
* connections and disconnections of clients.
*/
typedef struct QemudMultiplexer QemudMultiplexer;
struct QemudMultiplexer {
QemudSerial serial[1];
QemudClient* clients;
QemudService* services;
};
/* this is the serial_recv callback that is called
* whenever an incoming message arrives through the serial port
*/
static void
qemud_multiplexer_serial_recv( void* opaque,
int channel,
uint8_t* msg,
int msglen )
{
QemudMultiplexer* m = opaque;
QemudClient* c = m->clients;
/* dispatch to an existing client if possible
* note that channel 0 is handled by a special
* QemudClient that is setup in qemud_multiplexer_init()
*/
for ( ; c != NULL; c = c->next ) {
if (!_is_pipe_client(c) && c->ProtocolSelector.Serial.channel == channel) {
qemud_client_recv(c, msg, msglen);
return;
}
}
D("%s: ignoring %d bytes for unknown channel %d",
__FUNCTION__, msglen, channel);
}
/* handle a new connection attempt. This returns 0 on
* success, -1 if the service name is unknown, or -2
* if the service's maximum number of clients has been
* reached.
*/
static int
qemud_multiplexer_connect( QemudMultiplexer* m,
const char* service_name,
int channel_id )
{
/* find the corresponding registered service by name */
QemudService* sv = qemud_service_find(m->services, service_name);
if (sv == NULL) {
D("%s: no registered '%s' service", __FUNCTION__, service_name);
return -1;
}
/* check service's client count */
if (sv->max_clients > 0 && sv->num_clients >= sv->max_clients) {
D("%s: registration failed for '%s' service: too many clients (%d)",
__FUNCTION__, service_name, sv->num_clients);
return -2;
}
/* connect a new client to the service on the given channel */
if (qemud_service_connect_client(sv, channel_id, NULL) == NULL)
return -1;
return 0;
}
/* disconnect a given client from its channel id */
static void
qemud_multiplexer_disconnect( QemudMultiplexer* m,
int channel )
{
QemudClient* c;
/* find the client by its channel id, then disconnect it */
for (c = m->clients; c; c = c->next) {
if (!_is_pipe_client(c) && c->ProtocolSelector.Serial.channel == channel) {
D("%s: disconnecting client %d",
__FUNCTION__, channel);
/* note thatt this removes the client from
* m->clients automatically.
*/
c->ProtocolSelector.Serial.channel = -1; /* no need to send disconnect:<id> */
qemud_client_disconnect(c, 0);
return;
}
}
D("%s: disconnecting unknown channel %d",
__FUNCTION__, channel);
}
/* disconnects all channels, except for the control channel, without informing
* the daemon in the guest that disconnection has occurred.
*
* Used to silently kill clients when restoring emulator state snapshots.
*/
static void
qemud_multiplexer_disconnect_noncontrol( QemudMultiplexer* m )
{
QemudClient* c;
QemudClient* next = m->clients;
while (next) {
c = next;
next = c->next; /* disconnect frees c, remember next in advance */
if (!_is_pipe_client(c) && c->ProtocolSelector.Serial.channel > 0) {
/* skip control channel */
D("%s: disconnecting client %d",
__FUNCTION__, c->ProtocolSelector.Serial.channel);
D("%s: disconnecting client %d\n",
__FUNCTION__, c->ProtocolSelector.Serial.channel);
c->ProtocolSelector.Serial.channel = -1; /* do not send disconnect:<id> */
qemud_client_disconnect(c, 0);
}
}
}
/* handle control messages. This is used as the receive
* callback for the special QemudClient setup to manage
* channel 0.
*
* note that the message is zero-terminated for convenience
* (i.e. msg[msglen] is a valid memory read that returns '\0')
*/
static void
qemud_multiplexer_control_recv( void* opaque,
uint8_t* msg,
int msglen,
QemudClient* client )
{
QemudMultiplexer* mult = opaque;
uint8_t* msgend = msg + msglen;
char tmp[64], *p=tmp, *end=p+sizeof(tmp);
/* handle connection attempts.
* the client message must be "connect:<service-name>:<id>"
* where <id> is a 2-char hexadecimal string, which must be > 0
*/
if (msglen > 8 && !memcmp(msg, "connect:", 8))
{
const char* service_name = (const char*)msg + 8;
int channel, ret;
char* q;
q = strchr(service_name, ':');
if (q == NULL || q+3 != (char*)msgend) {
D("%s: malformed connect message: '%.*s' (offset=%d)",
__FUNCTION__, msglen, (const char*)msg, q ? q-(char*)msg : -1);
return;
}
*q++ = 0; /* zero-terminate service name */
channel = hex2int((uint8_t*)q, 2);
if (channel <= 0) {
D("%s: malformed channel id '%.*s",
__FUNCTION__, 2, q);
return;
}
ret = qemud_multiplexer_connect(mult, service_name, channel);
/* the answer can be one of:
* ok:connect:<id>
* ko:connect:<id>:<reason-for-failure>
*/
if (ret < 0) {
if (ret == -1) {
/* could not connect */
p = bufprint(tmp, end, "ko:connect:%02x:unknown service", channel);
} else {
p = bufprint(tmp, end, "ko:connect:%02x:service busy", channel);
}
}
else {
p = bufprint(tmp, end, "ok:connect:%02x", channel);
}
qemud_serial_send(mult->serial, 0, 0, (uint8_t*)tmp, p-tmp);
return;
}
/* handle client disconnections,
* this message arrives when the client has closed the connection.
* format: "disconnect:<id>" where <id> is a 2-hex channel id > 0
*/
if (msglen == 13 && !memcmp(msg, "disconnect:", 11)) {
int channel_id = hex2int(msg+11, 2);
if (channel_id <= 0) {
D("%s: malformed disconnect channel id: '%.*s'",
__FUNCTION__, 2, msg+11);
return;
}
qemud_multiplexer_disconnect(mult, channel_id);
return;
}
#if SUPPORT_LEGACY_QEMUD
/* an ok:connect:<service>:<id> message can be received if we're
* talking to a legacy qemud daemon, i.e. one running in a 1.0 or
* 1.1 system image.
*
* we should treat is as a normal "connect:" attempt, except that
* we must not send back any acknowledgment.
*/
if (msglen > 11 && !memcmp(msg, "ok:connect:", 11)) {
const char* service_name = (const char*)msg + 11;
char* q = strchr(service_name, ':');
int channel;
if (q == NULL || q+3 != (char*)msgend) {
D("%s: malformed legacy connect message: '%.*s' (offset=%d)",
__FUNCTION__, msglen, (const char*)msg, q ? q-(char*)msg : -1);
return;
}
*q++ = 0; /* zero-terminate service name */
channel = hex2int((uint8_t*)q, 2);
if (channel <= 0) {
D("%s: malformed legacy channel id '%.*s",
__FUNCTION__, 2, q);
return;
}
switch (mult->serial->version) {
case QEMUD_VERSION_UNKNOWN:
mult->serial->version = QEMUD_VERSION_LEGACY;
D("%s: legacy qemud daemon detected.", __FUNCTION__);
break;
case QEMUD_VERSION_LEGACY:
/* nothing unusual */
break;
default:
D("%s: weird, ignoring legacy qemud control message: '%.*s'",
__FUNCTION__, msglen, msg);
return;
}
/* "hw-control" was called "control" in 1.0/1.1 */
if (!strcmp(service_name,"control"))
service_name = "hw-control";
qemud_multiplexer_connect(mult, service_name, channel);
return;
}
/* anything else, don't answer for legacy */
if (mult->serial->version == QEMUD_VERSION_LEGACY)
return;
#endif /* SUPPORT_LEGACY_QEMUD */
/* anything else is a problem */
p = bufprint(tmp, end, "ko:unknown command");
qemud_serial_send(mult->serial, 0, 0, (uint8_t*)tmp, p-tmp);
}
/* initialize the global QemudMultiplexer.
*/
static void
qemud_multiplexer_init( QemudMultiplexer* mult,
CharDriverState* serial_cs )
{
/* initialize serial handler */
qemud_serial_init( mult->serial,
serial_cs,
qemud_multiplexer_serial_recv,
mult );
/* setup listener for channel 0 */
qemud_client_alloc(0,
NULL,
mult,
qemud_multiplexer_control_recv,
NULL, NULL, NULL,
mult->serial,
&mult->clients );
}
/* the global multiplexer state */
static QemudMultiplexer _multiplexer[1];
/** HIGH-LEVEL API
**/
/* this function must be used in the serv_connect callback
* of a given QemudService object (see qemud_service_register()
* below). It is used to register a new QemudClient to acknowledge
* a new client connection.
*
* 'clie_opaque', 'clie_recv' and 'clie_close' are used to
* send incoming client messages to the corresponding service
* implementation, or notify the service that a client has
* disconnected.
*/
QemudClient*
qemud_client_new( QemudService* service,
int channelId,
const char* client_param,
void* clie_opaque,
QemudClientRecv clie_recv,
QemudClientClose clie_close,
QemudClientSave clie_save,
QemudClientLoad clie_load )
{
QemudMultiplexer* m = _multiplexer;
QemudClient* c = qemud_client_alloc( channelId,
client_param,
clie_opaque,
clie_recv,
clie_close,
clie_save,
clie_load,
m->serial,
&m->clients );
qemud_service_add_client(service, c);
return c;
}
/* Caches a service message into the client's descriptor.
*
* See comments on QemudPipeMessage structure for more info.
*/
static void
_qemud_pipe_cache_buffer(QemudClient* client, const uint8_t* msg, int msglen)
{
QemudPipeMessage* buf;
QemudPipeMessage** ins_at = &client->ProtocolSelector.Pipe.messages;
/* Allocate descriptor big enough to contain message as well. */
buf = (QemudPipeMessage*)malloc(msglen + sizeof(QemudPipeMessage));
if (buf != NULL) {
/* Message starts right after the descriptor. */
buf->message = (uint8_t*)buf + sizeof(QemudPipeMessage);
buf->size = msglen;
memcpy(buf->message, msg, msglen);
buf->offset = 0;
buf->next = NULL;
while (*ins_at != NULL) {
ins_at = &(*ins_at)->next;
}
*ins_at = buf;
/* Notify the pipe that there is data to read. */
goldfish_pipe_wake(client->ProtocolSelector.Pipe.qemud_pipe->hwpipe,
PIPE_WAKE_READ);
}
}
/* Sends service message to the client.
*/
static void
_qemud_pipe_send(QemudClient* client, const uint8_t* msg, int msglen)
{
uint8_t frame[FRAME_HEADER_SIZE];
int avail, len = msglen;
int framing = client->framing;
if (msglen <= 0)
return;
D("%s: len=%3d '%s'",
__FUNCTION__, msglen, quote_bytes((const void*)msg, msglen));
if (framing) {
len += FRAME_HEADER_SIZE;
}
/* packetize the payload for the serial MTU */
while (len > 0)
{
avail = len;
if (avail > MAX_SERIAL_PAYLOAD)
avail = MAX_SERIAL_PAYLOAD;
/* insert frame header when needed */
if (framing) {
int2hex(frame, FRAME_HEADER_SIZE, msglen);
T("%s: '%.*s'", __FUNCTION__, FRAME_HEADER_SIZE, frame);
_qemud_pipe_cache_buffer(client, frame, FRAME_HEADER_SIZE);
avail -= FRAME_HEADER_SIZE;
len -= FRAME_HEADER_SIZE;
framing = 0;
}
/* write message content */
T("%s: '%.*s'", __FUNCTION__, avail, msg);
_qemud_pipe_cache_buffer(client, msg, avail);
msg += avail;
len -= avail;
}
}
/* this can be used by a service implementation to send an answer
* or message to a specific client.
*/
void
qemud_client_send ( QemudClient* client, const uint8_t* msg, int msglen )
{
if (_is_pipe_client(client)) {
_qemud_pipe_send(client, msg, msglen);
} else {
qemud_serial_send(client->ProtocolSelector.Serial.serial,
client->ProtocolSelector.Serial.channel,
client->framing != 0, msg, msglen);
}
}
/* enable framing for this client. When TRUE, this will
* use internally a simple 4-hexchar header before each
* message exchanged through the serial port.
*/
void
qemud_client_set_framing( QemudClient* client, int framing )
{
/* release dynamic buffer if we're disabling framing */
if (client->framing) {
if (!client->need_header) {
AFREE(client->payload->buff);
client->need_header = 1;
}
}
client->framing = !!framing;
}
/* this can be used by a service implementation to close a
* specific client connection.
*/
void
qemud_client_close( QemudClient* client )
{
qemud_client_disconnect(client, 0);
}
/** SNAPSHOT SUPPORT
**/
/* Saves the number of clients.
*/
static void
qemud_client_save_count(QEMUFile* f, QemudClient* c)
{
unsigned int client_count = 0;
for( ; c; c = c->next) // walk over linked list
/* skip control channel, which is not saved, and pipe channels that
* are saved along with the pipe. */
if (!_is_pipe_client(c) && c->ProtocolSelector.Serial.channel > 0)
client_count++;
qemu_put_be32(f, client_count);
}
/* Saves the number of services currently available.
*/
static void
qemud_service_save_count(QEMUFile* f, QemudService* s)
{
unsigned int service_count = 0;
for( ; s; s = s->next ) // walk over linked list
service_count++;
qemu_put_be32(f, service_count);
}
/* Save QemuD state to snapshot.
*
* The control channel has no state of its own, other than the local variables
* in qemud_multiplexer_control_recv. We can therefore safely skip saving it,
* which spares us dealing with the exception of a client not connected to a
* service.
*/
static void
qemud_save(QEMUFile* f, void* opaque)
{
QemudMultiplexer *m = opaque;
qemud_serial_save(f, m->serial);
/* save service states */
qemud_service_save_count(f, m->services);
QemudService *s;
for (s = m->services; s; s = s->next)
qemud_service_save(f, s);
/* save client channels */
qemud_client_save_count(f, m->clients);
QemudClient *c;
for (c = m->clients; c; c = c->next) {
/* skip control channel, and pipe clients */
if (!_is_pipe_client(c) && c->ProtocolSelector.Serial.channel > 0) {
qemud_serial_client_save(f, c);
}
}
}
/* Checks whether the same services are available at this point as when the
* snapshot was made.
*/
static int
qemud_load_services( QEMUFile* f, QemudService* current_services )
{
int i, ret;
int service_count = qemu_get_be32(f);
for (i = 0; i < service_count; i++) {
if ((ret = qemud_service_load(f, current_services)))
return ret;
}
return 0;
}
/* Removes all active non-control clients, then creates new ones with state
* taken from the snapshot.
*
* We do not send "disconnect" commands, over the channel. If we did, we might
* stop clients in the restored guest, resulting in an incorrect restore.
*
* Instead, we silently replace the clients that were running before the
* restore with new clients, whose state we copy from the snapshot. Since
* everything is multiplexed over one link, only the multiplexer notices the
* changes, there is no communication with the guest.
*/
static int
qemud_load_clients(QEMUFile* f, QemudMultiplexer* m, int version )
{
/* Remove all clients, except on the control channel.*/
qemud_multiplexer_disconnect_noncontrol(m);
/* Load clients from snapshot */
int client_count = qemu_get_be32(f);
int i, ret;
for (i = 0; i < client_count; i++) {
if ((ret = qemud_serial_client_load(f, m->services, version))) {
return ret;
}
}
return 0;
}
/* Load QemuD state from file.
*/
static int
qemud_load(QEMUFile *f, void* opaque, int version)
{
QemudMultiplexer *m = opaque;
int ret;
if ((ret = qemud_serial_load(f, m->serial)))
return ret;
if ((ret = qemud_load_services(f, m->services)))
return ret;
if ((ret = qemud_load_clients(f, m, version)))
return ret;
return 0;
}
/*------------------------------------------------------------------------------
*
* QEMUD PIPE service callbacks
*
* ----------------------------------------------------------------------------*/
/* Saves pending pipe message to the snapshot file. */
static void
_save_pipe_message(QEMUFile* f, QemudPipeMessage* msg)
{
qemu_put_be32(f, msg->size);
qemu_put_be32(f, msg->offset);
qemu_put_buffer(f, msg->message, msg->size);
}
/* Loads pending pipe messages from the snapshot file.
* Return:
* List of pending pipe messages loaded from snapshot, or NULL if snapshot didn't
* contain saved messages.
*/
static QemudPipeMessage*
_load_pipe_message(QEMUFile* f)
{
QemudPipeMessage* ret = NULL;
QemudPipeMessage** next = &ret;
uint32_t size = qemu_get_be32(f);
while (size != 0) {
QemudPipeMessage* wrk;
ANEW0(wrk);
*next = wrk;
wrk->size = size;
wrk->offset = qemu_get_be32(f);
wrk->message = malloc(wrk->size);
if (wrk->message == NULL) {
APANIC("Unable to allocate buffer for pipe's pending message.");
}
qemu_get_buffer(f, wrk->message, wrk->size);
next = &wrk->next;
*next = NULL;
size = qemu_get_be32(f);
}
return ret;
}
/* This is a callback that gets invoked when guest is connecting to the service.
*
* Here we will create a new client as well as pipe descriptor representing new
* connection.
*/
static void*
_qemudPipe_init(void* hwpipe, void* _looper, const char* args)
{
QemudMultiplexer *m = _multiplexer;
QemudService* sv = m->services;
QemudClient* client;
QemudPipe* pipe = NULL;
char service_name[512];
const char* client_args;
size_t srv_name_len;
/* 'args' passed in this callback represents name of the service the guest is
* connecting to. It can't be NULL. */
if (args == NULL) {
D("%s: Missing address!", __FUNCTION__);
return NULL;
}
/* 'args' contain service name, and optional parameters for the client that
* is about to be created in this call. The parameters are separated from the
* service name wit ':'. Separate service name from the client param. */
client_args = strchr(args, ':');
if (client_args != NULL) {
srv_name_len = min(client_args - args, sizeof(service_name) - 1);
client_args++; // Past the ':'
if (*client_args == '\0') {
/* No actual parameters. */
client_args = NULL;
}
} else {
srv_name_len = min(strlen(args), sizeof(service_name) - 1);
}
memcpy(service_name, args, srv_name_len);
service_name[srv_name_len] = '\0';
/* Lookup registered service by its name. */
while (sv != NULL && strcmp(sv->name, service_name)) {
sv = sv->next;
}
if (sv == NULL) {
D("%s: Service '%s' has not been registered!", __FUNCTION__, service_name);
return NULL;
}
/* Create a client for this connection. -1 as a channel ID signals that this
* is a pipe client. */
client = qemud_service_connect_client(sv, -1, client_args);
if (client != NULL) {
ANEW0(pipe);
pipe->hwpipe = hwpipe;
pipe->looper = _looper;
pipe->service = sv;
pipe->client = client;
client->ProtocolSelector.Pipe.qemud_pipe = pipe;
}
return pipe;
}
/* Called when the guest wants to close the channel.
*/
static void
_qemudPipe_closeFromGuest( void* opaque )
{
QemudPipe* pipe = opaque;
QemudClient* client = pipe->client;
D("%s", __FUNCTION__);
if (client != NULL) {
qemud_client_disconnect(client, 1);
} else {
D("%s: Unexpected NULL client", __FUNCTION__);
}
}
/* Called when the guest has sent some data to the client.
*/
static int
_qemudPipe_sendBuffers(void* opaque,
const GoldfishPipeBuffer* buffers,
int numBuffers)
{
QemudPipe* pipe = opaque;
QemudClient* client = pipe->client;
size_t transferred = 0;
if (client == NULL) {
D("%s: Unexpected NULL client", __FUNCTION__);
return -1;
}
if (numBuffers == 1) {
/* Simple case: all data are in one buffer. */
D("%s: %s", __FUNCTION__, quote_bytes((char*)buffers->data, buffers->size));
qemud_client_recv(client, buffers->data, buffers->size);
transferred = buffers->size;
} else {
/* If there are multiple buffers involved, collect all data in one buffer
* before calling the high level client. */
uint8_t* msg, *wrk;
int n;
for (n = 0; n < numBuffers; n++) {
transferred += buffers[n].size;
}
msg = malloc(transferred);
wrk = msg;
for (n = 0; n < numBuffers; n++) {
memcpy(wrk, buffers[n].data, buffers[n].size);
wrk += buffers[n].size;
}
D("%s: %s", __FUNCTION__, quote_bytes((char*)msg, transferred));
qemud_client_recv(client, msg, transferred);
free(msg);
}
return transferred;
}
/* Called when the guest is reading data from the client.
*/
static int
_qemudPipe_recvBuffers(void* opaque, GoldfishPipeBuffer* buffers, int numBuffers)
{
QemudPipe* pipe = opaque;
QemudClient* client = pipe->client;
QemudPipeMessage** msg_list;
GoldfishPipeBuffer* buff = buffers;
GoldfishPipeBuffer* endbuff = buffers + numBuffers;
size_t sent_bytes = 0;
size_t off_in_buff = 0;
if (client == NULL) {
D("%s: Unexpected NULL client", __FUNCTION__);
return -1;
}
msg_list = &client->ProtocolSelector.Pipe.messages;
if (*msg_list == NULL) {
/* No data to send. Let it block until we wake it up with
* PIPE_WAKE_READ when service sends data to the client. */
return PIPE_ERROR_AGAIN;
}
/* Fill in goldfish buffers while they are still available, and there are
* messages in the client's message list. */
while (buff != endbuff && *msg_list != NULL) {
QemudPipeMessage* msg = *msg_list;
/* Message data fiting the current pipe's buffer. */
size_t to_copy = min(msg->size - msg->offset, buff->size - off_in_buff);
memcpy(buff->data + off_in_buff, msg->message + msg->offset, to_copy);
/* Update offsets. */
off_in_buff += to_copy;
msg->offset += to_copy;
sent_bytes += to_copy;
if (msg->size == msg->offset) {
/* We're done with the current message. Go to the next one. */
*msg_list = msg->next;
free(msg);
}
if (off_in_buff == buff->size) {
/* Current pipe buffer is full. Continue with the next one. */
buff++;
off_in_buff = 0;
}
}
D("%s: -> %u (of %u)", __FUNCTION__, sent_bytes, buffers->size);
return sent_bytes;
}
static unsigned
_qemudPipe_poll(void* opaque)
{
QemudPipe* pipe = opaque;
QemudClient* client = pipe->client;
unsigned ret = 0;
if (client != NULL) {
ret |= PIPE_POLL_OUT;
if (client->ProtocolSelector.Pipe.messages != NULL) {
ret |= PIPE_POLL_IN;
}
} else {
D("%s: Unexpected NULL client", __FUNCTION__);
}
return ret;
}
static void
_qemudPipe_wakeOn(void* opaque, int flags)
{
D("%s: -> %X", __FUNCTION__, flags);
}
static void
_qemudPipe_save(void* opaque, QEMUFile* f )
{
QemudPipe* qemud_pipe = (QemudPipe*)opaque;
QemudClient* c = qemud_pipe->client;
QemudPipeMessage* msg = c->ProtocolSelector.Pipe.messages;
/* save generic information */
qemud_service_save_name(f, c->service);
qemu_put_string(f, c->param);
/* Save pending messages. */
while (msg != NULL) {
_save_pipe_message(f, msg);
msg = msg->next;
}
/* End of pending messages. */
qemu_put_be32(f, 0);
/* save client-specific state */
if (c->clie_save)
c->clie_save(f, c, c->clie_opaque);
/* save framing configuration */
qemu_put_be32(f, c->framing);
if (c->framing) {
qemu_put_be32(f, c->need_header);
/* header sink always connected to c->header0, no need to save */
qemu_put_be32(f, FRAME_HEADER_SIZE);
qemu_put_buffer(f, c->header0, FRAME_HEADER_SIZE);
/* payload sink */
qemud_sink_save(f, c->payload);
qemu_put_buffer(f, c->payload->buff, c->payload->size);
}
}
static void*
_qemudPipe_load(void* hwpipe, void* pipeOpaque, const char* args, QEMUFile* f)
{
QemudPipe* qemud_pipe = NULL;
char* param;
char *service_name = qemud_service_load_name(f);
if (service_name == NULL)
return NULL;
/* get service instance for the loading client*/
QemudService *sv = qemud_service_find(_multiplexer->services, service_name);
if (sv == NULL) {
D("%s: load failed: unknown service \"%s\"\n",
__FUNCTION__, service_name);
return NULL;
}
/* Load saved parameters. */
param = qemu_get_string(f);
/* re-connect client */
QemudClient* c = qemud_service_connect_client(sv, -1, param);
if(c == NULL)
return NULL;
/* Load pending messages. */
c->ProtocolSelector.Pipe.messages = _load_pipe_message(f);
/* load client-specific state */
if (c->clie_load && c->clie_load(f, c, c->clie_opaque)) {
/* load failure */
return NULL;
}
/* load framing configuration */
c->framing = qemu_get_be32(f);
if (c->framing) {
/* header buffer */
c->need_header = qemu_get_be32(f);
int header_size = qemu_get_be32(f);
if (header_size > FRAME_HEADER_SIZE) {
D("%s: load failed: payload buffer requires %d bytes, %d available\n",
__FUNCTION__, header_size, FRAME_HEADER_SIZE);
return NULL;
}
int ret;
if ((ret = qemu_get_buffer(f, c->header0, header_size)) != header_size) {
D("%s: frame header buffer load failed: expected %d bytes, got %d\n",
__FUNCTION__, header_size, ret);
return NULL;
}
/* payload sink */
if ((ret = qemud_sink_load(f, c->payload)))
return NULL;
/* replace payload buffer by saved data */
if (c->payload->buff) {
AFREE(c->payload->buff);
}
AARRAY_NEW(c->payload->buff, c->payload->size+1); /* +1 for terminating zero */
if ((ret = qemu_get_buffer(f, c->payload->buff, c->payload->size)) != c->payload->size) {
D("%s: frame payload buffer load failed: expected %d bytes, got %d\n",
__FUNCTION__, c->payload->size, ret);
AFREE(c->payload->buff);
return NULL;
}
}
/* Associate the client with the pipe. */
ANEW0(qemud_pipe);
qemud_pipe->hwpipe = hwpipe;
qemud_pipe->looper = pipeOpaque;
qemud_pipe->service = sv;
qemud_pipe->client = c;
c->ProtocolSelector.Pipe.qemud_pipe = qemud_pipe;
return qemud_pipe;
}
/* QEMUD pipe functions.
*/
static const GoldfishPipeFuncs _qemudPipe_funcs = {
_qemudPipe_init,
_qemudPipe_closeFromGuest,
_qemudPipe_sendBuffers,
_qemudPipe_recvBuffers,
_qemudPipe_poll,
_qemudPipe_wakeOn,
_qemudPipe_save,
_qemudPipe_load,
};
/* Initializes QEMUD pipe interface.
*/
static void
_android_qemud_pipe_init(void)
{
static ABool _qemud_pipe_initialized = false;
if (!_qemud_pipe_initialized) {
goldfish_pipe_add_type( "qemud", looper_newCore(), &_qemudPipe_funcs );
_qemud_pipe_initialized = true;
}
}
/* this is the end of the serial charpipe that must be passed
* to the emulated tty implementation. The other end of the
* charpipe must be passed to qemud_multiplexer_init().
*/
static CharDriverState* android_qemud_cs;
/* Initializes QEMUD serial interface.
*/
static void
_android_qemud_serial_init(void)
{
CharDriverState* cs;
if (android_qemud_cs != NULL)
return;
if (qemu_chr_open_charpipe( &android_qemud_cs, &cs ) < 0) {
derror( "%s: can't create charpipe to serial port",
__FUNCTION__ );
exit(1);
}
qemud_multiplexer_init(_multiplexer, cs);
register_savevm(NULL,
"qemud",
0,
QEMUD_SAVE_VERSION,
qemud_save,
qemud_load,
_multiplexer);
}
extern void
android_qemud_init( void )
{
D("%s", __FUNCTION__);
/* We don't know in advance whether the guest system supports qemud pipes,
* so we will initialize both qemud machineries, the legacy (over serial
* port), and the new one (over qemu pipe). Then we let the guest to connect
* via one, or the other. */
_android_qemud_serial_init();
_android_qemud_pipe_init();
}
/* return the serial charpipe endpoint that must be used
* by the emulated tty implementation.
*/
CharDriverState* android_qemud_get_cs( void )
{
if (android_qemud_cs == NULL)
android_qemud_init();
return android_qemud_cs;
}
/* this function is used to register a new named qemud-based
* service. You must provide 'serv_opaque' and 'serv_connect'
* which will be called whenever a new client tries to connect
* to the services.
*
* 'serv_connect' shall return NULL if the connection is refused,
* or a handle to a new QemudClient otherwise. The latter can be
* created through qemud_client_new() defined above.
*
* 'max_clients' is the maximum number of clients accepted by
* the service concurrently. If this value is 0, then any number
* of clients can connect.
*/
QemudService*
qemud_service_register( const char* service_name,
int max_clients,
void* serv_opaque,
QemudServiceConnect serv_connect,
QemudServiceSave serv_save,
QemudServiceLoad serv_load )
{
QemudService* sv;
QemudMultiplexer* m = _multiplexer;
android_qemud_init();
sv = qemud_service_new(service_name,
max_clients,
serv_opaque,
serv_connect,
serv_save,
serv_load,
&m->services);
D("Registered QEMUD service %s", service_name);
return sv;
}
/* broadcast a given message to all clients of a given QemudService
*/
extern void
qemud_service_broadcast( QemudService* sv,
const uint8_t* msg,
int msglen )
{
QemudClient* c;
for (c = sv->clients; c; c = c->next_serv)
qemud_client_send(c, msg, msglen);
}
/*
* The following code is used for backwards compatibility reasons.
* It allows you to implement a given qemud-based service through
* a charpipe.
*
* In other words, this implements a QemudService and corresponding
* QemudClient that connects a qemud client running in the emulated
* system, to a CharDriverState object implemented through a charpipe.
*
* QemudCharClient <===charpipe====> (char driver user)
*
* For example, this is used to implement the "gsm" service when the
* modem emulation is provided through an external serial device.
*
* A QemudCharService can have only one client by definition.
* There is no QemudCharClient object because we can store a single
* CharDriverState handle in the 'opaque' field for simplicity.
*/
typedef struct {
QemudService* service;
CharDriverState* cs;
} QemudCharService;
/* called whenever a new message arrives from a qemud client.
* this simply sends the message through the charpipe to the user.
*/
static void
_qemud_char_client_recv( void* opaque, uint8_t* msg, int msglen,
QemudClient* client )
{
CharDriverState* cs = opaque;
qemu_chr_write(cs, msg, msglen);
}
/* we don't expect clients of char. services to exit. Just
* print an error to signal an unexpected situation. We should
* be able to recover from these though, so don't panic.
*/
static void
_qemud_char_client_close( void* opaque )
{
QemudClient* client = opaque;
/* At this point modem driver still uses char pipe to communicate with
* hw-qemud, while communication with the guest is done over qemu pipe.
* So, when guest disconnects from the qemu pipe, and emulator-side client
* goes through the disconnection process, this routine is called, since it
* has been set to called during service registration. Unless modem driver
* is changed to drop char pipe communication, this routine will be called
* due to guest disconnection. As long as the client was a qemu pipe - based
* client, it's fine, since we don't really need to do anything in this case.
*/
if (!_is_pipe_client(client)) {
derror("unexpected qemud char. channel close");
}
}
/* called by the charpipe to know how much data can be read from
* the user. Since we send everything directly to the serial port
* we can return an arbitrary number.
*/
static int
_qemud_char_service_can_read( void* opaque )
{
return 8192; /* whatever */
}
/* called to read data from the charpipe and send it to the client.
* used qemud_service_broadcast() even if there is a single client
* because we don't need a QemudCharClient object this way.
*/
static void
_qemud_char_service_read( void* opaque, const uint8_t* from, int len )
{
QemudService* sv = opaque;
qemud_service_broadcast( sv, from, len );
}
/* called when a qemud client tries to connect to a char. service.
* we simply create a new client and open the charpipe to receive
* data from it.
*/
static QemudClient*
_qemud_char_service_connect(void* opaque,
QemudService* sv,
int channel,
const char* client_param )
{
CharDriverState* cs = opaque;
QemudClient* c = qemud_client_new( sv, channel, client_param,
cs,
_qemud_char_client_recv,
_qemud_char_client_close,
NULL, NULL );
/* now we can open the gates :-) */
qemu_chr_add_handlers( cs,
_qemud_char_service_can_read,
_qemud_char_service_read,
NULL,
sv );
return c;
}
/* returns a charpipe endpoint that can be used by an emulated
* device or external serial port to implement a char. service
*/
int
android_qemud_get_channel( const char* name, CharDriverState* *pcs )
{
CharDriverState* cs;
if (qemu_chr_open_charpipe(&cs, pcs) < 0) {
derror("can't open charpipe for '%s' qemud service", name);
exit(2);
}
qemud_service_register(name, 1, cs, _qemud_char_service_connect, NULL, NULL);
return 0;
}
/* set the character driver state for a given qemud communication channel. this
* is used to attach the channel to an external char driver device directly.
* returns 0 on success, -1 on error
*/
int
android_qemud_set_channel( const char* name, CharDriverState* peer_cs )
{
CharDriverState* char_buffer = qemu_chr_open_buffer(peer_cs);
if (char_buffer == NULL)
return -1;
qemud_service_register(name, 1, char_buffer, _qemud_char_service_connect,
NULL, NULL);
return 0;
}