/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include "sysdeps.h"
#define TRACE_TAG TRACE_SOCKETS
#include "adb.h"
ADB_MUTEX_DEFINE( socket_list_lock );
static void local_socket_close_locked(asocket *s);
int sendfailmsg(int fd, const char *reason)
{
char buf[9];
int len;
len = strlen(reason);
if(len > 0xffff) len = 0xffff;
snprintf(buf, sizeof buf, "FAIL%04x", len);
if(writex(fd, buf, 8)) return -1;
return writex(fd, reason, len);
}
//extern int online;
static unsigned local_socket_next_id = 1;
static asocket local_socket_list = {
.next = &local_socket_list,
.prev = &local_socket_list,
};
/* the the list of currently closing local sockets.
** these have no peer anymore, but still packets to
** write to their fd.
*/
static asocket local_socket_closing_list = {
.next = &local_socket_closing_list,
.prev = &local_socket_closing_list,
};
asocket *find_local_socket(unsigned id)
{
asocket *s;
asocket *result = NULL;
adb_mutex_lock(&socket_list_lock);
for (s = local_socket_list.next; s != &local_socket_list; s = s->next) {
if (s->id == id) {
result = s;
break;
}
}
adb_mutex_unlock(&socket_list_lock);
return result;
}
static void
insert_local_socket(asocket* s, asocket* list)
{
s->next = list;
s->prev = s->next->prev;
s->prev->next = s;
s->next->prev = s;
}
void install_local_socket(asocket *s)
{
adb_mutex_lock(&socket_list_lock);
s->id = local_socket_next_id++;
insert_local_socket(s, &local_socket_list);
adb_mutex_unlock(&socket_list_lock);
}
void remove_socket(asocket *s)
{
// socket_list_lock should already be held
if (s->prev && s->next)
{
s->prev->next = s->next;
s->next->prev = s->prev;
s->next = 0;
s->prev = 0;
s->id = 0;
}
}
void close_all_sockets(atransport *t)
{
asocket *s;
/* this is a little gross, but since s->close() *will* modify
** the list out from under you, your options are limited.
*/
adb_mutex_lock(&socket_list_lock);
restart:
for(s = local_socket_list.next; s != &local_socket_list; s = s->next){
if(s->transport == t || (s->peer && s->peer->transport == t)) {
local_socket_close_locked(s);
goto restart;
}
}
adb_mutex_unlock(&socket_list_lock);
}
static int local_socket_enqueue(asocket *s, apacket *p)
{
D("LS(%d): enqueue %d\n", s->id, p->len);
p->ptr = p->data;
/* if there is already data queue'd, we will receive
** events when it's time to write. just add this to
** the tail
*/
if(s->pkt_first) {
goto enqueue;
}
/* write as much as we can, until we
** would block or there is an error/eof
*/
while(p->len > 0) {
int r = adb_write(s->fd, p->ptr, p->len);
if(r > 0) {
p->len -= r;
p->ptr += r;
continue;
}
if((r == 0) || (errno != EAGAIN)) {
D( "LS(%d): not ready, errno=%d: %s\n", s->id, errno, strerror(errno) );
s->close(s);
return 1; /* not ready (error) */
} else {
break;
}
}
if(p->len == 0) {
put_apacket(p);
return 0; /* ready for more data */
}
enqueue:
p->next = 0;
if(s->pkt_first) {
s->pkt_last->next = p;
} else {
s->pkt_first = p;
}
s->pkt_last = p;
/* make sure we are notified when we can drain the queue */
fdevent_add(&s->fde, FDE_WRITE);
return 1; /* not ready (backlog) */
}
static void local_socket_ready(asocket *s)
{
/* far side is ready for data, pay attention to
readable events */
fdevent_add(&s->fde, FDE_READ);
// D("LS(%d): ready()\n", s->id);
}
static void local_socket_close(asocket *s)
{
adb_mutex_lock(&socket_list_lock);
local_socket_close_locked(s);
adb_mutex_unlock(&socket_list_lock);
}
// be sure to hold the socket list lock when calling this
static void local_socket_destroy(asocket *s)
{
apacket *p, *n;
D("LS(%d): destroying fde.fd=%d\n", s->id, s->fde.fd);
/* IMPORTANT: the remove closes the fd
** that belongs to this socket
*/
fdevent_remove(&s->fde);
/* dispose of any unwritten data */
for(p = s->pkt_first; p; p = n) {
D("LS(%d): discarding %d bytes\n", s->id, p->len);
n = p->next;
put_apacket(p);
}
remove_socket(s);
free(s);
}
static void local_socket_close_locked(asocket *s)
{
D("entered. LS(%d) fd=%d\n", s->id, s->fd);
if(s->peer) {
D("LS(%d): closing peer. peer->id=%d peer->fd=%d\n",
s->id, s->peer->id, s->peer->fd);
s->peer->peer = 0;
// tweak to avoid deadlock
if (s->peer->close == local_socket_close) {
local_socket_close_locked(s->peer);
} else {
s->peer->close(s->peer);
}
s->peer = 0;
}
/* If we are already closing, or if there are no
** pending packets, destroy immediately
*/
if (s->closing || s->pkt_first == NULL) {
int id = s->id;
local_socket_destroy(s);
D("LS(%d): closed\n", id);
return;
}
/* otherwise, put on the closing list
*/
D("LS(%d): closing\n", s->id);
s->closing = 1;
fdevent_del(&s->fde, FDE_READ);
remove_socket(s);
D("LS(%d): put on socket_closing_list fd=%d\n", s->id, s->fd);
insert_local_socket(s, &local_socket_closing_list);
}
static void local_socket_event_func(int fd, unsigned ev, void *_s)
{
asocket *s = _s;
D("LS(%d): event_func(fd=%d(==%d), ev=%04x)\n", s->id, s->fd, fd, ev);
/* put the FDE_WRITE processing before the FDE_READ
** in order to simplify the code.
*/
if(ev & FDE_WRITE){
apacket *p;
while((p = s->pkt_first) != 0) {
while(p->len > 0) {
int r = adb_write(fd, p->ptr, p->len);
if(r > 0) {
p->ptr += r;
p->len -= r;
continue;
}
if(r < 0) {
/* returning here is ok because FDE_READ will
** be processed in the next iteration loop
*/
if(errno == EAGAIN) return;
if(errno == EINTR) continue;
}
D(" closing after write because r=%d and errno is %d\n", r, errno);
s->close(s);
return;
}
if(p->len == 0) {
s->pkt_first = p->next;
if(s->pkt_first == 0) s->pkt_last = 0;
put_apacket(p);
}
}
/* if we sent the last packet of a closing socket,
** we can now destroy it.
*/
if (s->closing) {
D(" closing because 'closing' is set after write\n");
s->close(s);
return;
}
/* no more packets queued, so we can ignore
** writable events again and tell our peer
** to resume writing
*/
fdevent_del(&s->fde, FDE_WRITE);
s->peer->ready(s->peer);
}
if(ev & FDE_READ){
apacket *p = get_apacket();
unsigned char *x = p->data;
size_t avail = MAX_PAYLOAD;
int r;
int is_eof = 0;
while(avail > 0) {
r = adb_read(fd, x, avail);
D("LS(%d): post adb_read(fd=%d,...) r=%d (errno=%d) avail=%zu\n",
s->id, s->fd, r, r<0?errno:0, avail);
if(r > 0) {
avail -= r;
x += r;
continue;
}
if(r < 0) {
if(errno == EAGAIN) break;
if(errno == EINTR) continue;
}
/* r = 0 or unhandled error */
is_eof = 1;
break;
}
D("LS(%d): fd=%d post avail loop. r=%d is_eof=%d forced_eof=%d\n",
s->id, s->fd, r, is_eof, s->fde.force_eof);
if((avail == MAX_PAYLOAD) || (s->peer == 0)) {
put_apacket(p);
} else {
p->len = MAX_PAYLOAD - avail;
r = s->peer->enqueue(s->peer, p);
D("LS(%d): fd=%d post peer->enqueue(). r=%d\n", s->id, s->fd, r);
if(r < 0) {
/* error return means they closed us as a side-effect
** and we must return immediately.
**
** note that if we still have buffered packets, the
** socket will be placed on the closing socket list.
** this handler function will be called again
** to process FDE_WRITE events.
*/
return;
}
if(r > 0) {
/* if the remote cannot accept further events,
** we disable notification of READs. They'll
** be enabled again when we get a call to ready()
*/
fdevent_del(&s->fde, FDE_READ);
}
}
/* Don't allow a forced eof if data is still there */
if((s->fde.force_eof && !r) || is_eof) {
D(" closing because is_eof=%d r=%d s->fde.force_eof=%d\n", is_eof, r, s->fde.force_eof);
s->close(s);
}
}
if(ev & FDE_ERROR){
/* this should be caught be the next read or write
** catching it here means we may skip the last few
** bytes of readable data.
*/
// s->close(s);
D("LS(%d): FDE_ERROR (fd=%d)\n", s->id, s->fd);
return;
}
}
asocket *create_local_socket(int fd)
{
asocket *s = calloc(1, sizeof(asocket));
if (s == NULL) fatal("cannot allocate socket");
s->fd = fd;
s->enqueue = local_socket_enqueue;
s->ready = local_socket_ready;
s->close = local_socket_close;
install_local_socket(s);
fdevent_install(&s->fde, fd, local_socket_event_func, s);
/* fdevent_add(&s->fde, FDE_ERROR); */
//fprintf(stderr, "Created local socket in create_local_socket \n");
D("LS(%d): created (fd=%d)\n", s->id, s->fd);
return s;
}
asocket *create_local_service_socket(const char *name)
{
asocket *s;
int fd;
fd = service_to_fd(name);
if(fd < 0) return 0;
s = create_local_socket(fd);
D("LS(%d): bound to '%s' via %d\n", s->id, name, fd);
return s;
}
/* a Remote socket is used to send/receive data to/from a given transport object
** it needs to be closed when the transport is forcibly destroyed by the user
*/
typedef struct aremotesocket {
asocket socket;
adisconnect disconnect;
} aremotesocket;
static int remote_socket_enqueue(asocket *s, apacket *p)
{
D("entered remote_socket_enqueue RS(%d) WRITE fd=%d peer.fd=%d\n",
s->id, s->fd, s->peer->fd);
p->msg.command = A_WRTE;
p->msg.arg0 = s->peer->id;
p->msg.arg1 = s->id;
p->msg.data_length = p->len;
send_packet(p, s->transport);
return 1;
}
static void remote_socket_ready(asocket *s)
{
D("entered remote_socket_ready RS(%d) OKAY fd=%d peer.fd=%d\n",
s->id, s->fd, s->peer->fd);
apacket *p = get_apacket();
p->msg.command = A_OKAY;
p->msg.arg0 = s->peer->id;
p->msg.arg1 = s->id;
send_packet(p, s->transport);
}
static void remote_socket_close(asocket *s)
{
D("entered remote_socket_close RS(%d) CLOSE fd=%d peer->fd=%d\n",
s->id, s->fd, s->peer?s->peer->fd:-1);
apacket *p = get_apacket();
p->msg.command = A_CLSE;
if(s->peer) {
p->msg.arg0 = s->peer->id;
s->peer->peer = 0;
D("RS(%d) peer->close()ing peer->id=%d peer->fd=%d\n",
s->id, s->peer->id, s->peer->fd);
s->peer->close(s->peer);
}
p->msg.arg1 = s->id;
send_packet(p, s->transport);
D("RS(%d): closed\n", s->id);
remove_transport_disconnect( s->transport, &((aremotesocket*)s)->disconnect );
free(s);
}
static void remote_socket_disconnect(void* _s, atransport* t)
{
asocket* s = _s;
asocket* peer = s->peer;
D("remote_socket_disconnect RS(%d)\n", s->id);
if (peer) {
peer->peer = NULL;
peer->close(peer);
}
remove_transport_disconnect( s->transport, &((aremotesocket*)s)->disconnect );
free(s);
}
asocket *create_remote_socket(unsigned id, atransport *t)
{
asocket *s = calloc(1, sizeof(aremotesocket));
adisconnect* dis = &((aremotesocket*)s)->disconnect;
if (s == NULL) fatal("cannot allocate socket");
s->id = id;
s->enqueue = remote_socket_enqueue;
s->ready = remote_socket_ready;
s->close = remote_socket_close;
s->transport = t;
dis->func = remote_socket_disconnect;
dis->opaque = s;
add_transport_disconnect( t, dis );
D("RS(%d): created\n", s->id);
return s;
}
void connect_to_remote(asocket *s, const char *destination)
{
D("Connect_to_remote call RS(%d) fd=%d\n", s->id, s->fd);
apacket *p = get_apacket();
int len = strlen(destination) + 1;
if(len > (MAX_PAYLOAD-1)) {
fatal("destination oversized");
}
D("LS(%d): connect('%s')\n", s->id, destination);
p->msg.command = A_OPEN;
p->msg.arg0 = s->id;
p->msg.data_length = len;
strcpy((char*) p->data, destination);
send_packet(p, s->transport);
}
/* this is used by magic sockets to rig local sockets to
send the go-ahead message when they connect */
static void local_socket_ready_notify(asocket *s)
{
s->ready = local_socket_ready;
s->close = local_socket_close;
adb_write(s->fd, "OKAY", 4);
s->ready(s);
}
/* this is used by magic sockets to rig local sockets to
send the failure message if they are closed before
connected (to avoid closing them without a status message) */
static void local_socket_close_notify(asocket *s)
{
s->ready = local_socket_ready;
s->close = local_socket_close;
sendfailmsg(s->fd, "closed");
s->close(s);
}
unsigned unhex(unsigned char *s, int len)
{
unsigned n = 0, c;
while(len-- > 0) {
switch((c = *s++)) {
case '0': case '1': case '2':
case '3': case '4': case '5':
case '6': case '7': case '8':
case '9':
c -= '0';
break;
case 'a': case 'b': case 'c':
case 'd': case 'e': case 'f':
c = c - 'a' + 10;
break;
case 'A': case 'B': case 'C':
case 'D': case 'E': case 'F':
c = c - 'A' + 10;
break;
default:
return 0xffffffff;
}
n = (n << 4) | c;
}
return n;
}
/* skip_host_serial return the position in a string
skipping over the 'serial' parameter in the ADB protocol,
where parameter string may be a host:port string containing
the protocol delimiter (colon). */
char *skip_host_serial(char *service) {
char *first_colon, *serial_end;
first_colon = strchr(service, ':');
if (!first_colon) {
/* No colon in service string. */
return NULL;
}
serial_end = first_colon;
if (isdigit(serial_end[1])) {
serial_end++;
while ((*serial_end) && isdigit(*serial_end)) {
serial_end++;
}
if ((*serial_end) != ':') {
// Something other than numbers was found, reset the end.
serial_end = first_colon;
}
}
return serial_end;
}
static int smart_socket_enqueue(asocket *s, apacket *p)
{
unsigned len;
D("SS(%d): enqueue %d\n", s->id, p->len);
if(s->pkt_first == 0) {
s->pkt_first = p;
s->pkt_last = p;
} else {
if((s->pkt_first->len + p->len) > MAX_PAYLOAD) {
D("SS(%d): overflow\n", s->id);
put_apacket(p);
goto fail;
}
memcpy(s->pkt_first->data + s->pkt_first->len,
p->data, p->len);
s->pkt_first->len += p->len;
put_apacket(p);
p = s->pkt_first;
}
/* don't bother if we can't decode the length */
if(p->len < 4) return 0;
len = unhex(p->data, 4);
if((len < 1) || (len > 1024)) {
D("SS(%d): bad size (%d)\n", s->id, len);
goto fail;
}
D("SS(%d): len is %d\n", s->id, len );
/* can't do anything until we have the full header */
if((len + 4) > p->len) {
D("SS(%d): waiting for %d more bytes\n", s->id, len+4 - p->len);
return 0;
}
p->data[len + 4] = 0;
D("SS(%d): '%s'\n", s->id, (char*) (p->data + 4));
if (s->transport == NULL) {
char* error_string = "unknown failure";
s->transport = acquire_one_transport (CS_ANY,
kTransportAny, NULL, &error_string);
if (s->transport == NULL) {
sendfailmsg(s->peer->fd, error_string);
goto fail;
}
}
if(!(s->transport) || (s->transport->connection_state == CS_OFFLINE)) {
/* if there's no remote we fail the connection
** right here and terminate it
*/
sendfailmsg(s->peer->fd, "device offline (x)");
goto fail;
}
/* instrument our peer to pass the success or fail
** message back once it connects or closes, then
** detach from it, request the connection, and
** tear down
*/
s->peer->ready = local_socket_ready_notify;
s->peer->close = local_socket_close_notify;
s->peer->peer = 0;
/* give him our transport and upref it */
s->peer->transport = s->transport;
connect_to_remote(s->peer, (char*) (p->data + 4));
s->peer = 0;
s->close(s);
return 1;
fail:
/* we're going to close our peer as a side-effect, so
** return -1 to signal that state to the local socket
** who is enqueueing against us
*/
s->close(s);
return -1;
}
static void smart_socket_ready(asocket *s)
{
D("SS(%d): ready\n", s->id);
}
static void smart_socket_close(asocket *s)
{
D("SS(%d): closed\n", s->id);
if(s->pkt_first){
put_apacket(s->pkt_first);
}
if(s->peer) {
s->peer->peer = 0;
s->peer->close(s->peer);
s->peer = 0;
}
free(s);
}
asocket *create_smart_socket(void (*action_cb)(asocket *s, const char *act))
{
D("Creating smart socket \n");
asocket *s = calloc(1, sizeof(asocket));
if (s == NULL) fatal("cannot allocate socket");
s->enqueue = smart_socket_enqueue;
s->ready = smart_socket_ready;
s->close = smart_socket_close;
s->extra = action_cb;
D("SS(%d): created %p\n", s->id, action_cb);
return s;
}
void smart_socket_action(asocket *s, const char *act)
{
}
void connect_to_smartsocket(asocket *s)
{
D("Connecting to smart socket \n");
asocket *ss = create_smart_socket(smart_socket_action);
s->peer = ss;
ss->peer = s;
s->ready(s);
}
