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platform_system_core/adb/transport.c

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/*
* 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 <string.h>
#include <errno.h>
#include "sysdeps.h"
#define TRACE_TAG TRACE_TRANSPORT
#include "adb.h"
static void transport_unref(atransport *t);
static atransport transport_list = {
.next = &transport_list,
.prev = &transport_list,
};
ADB_MUTEX_DEFINE( transport_lock );
#if ADB_TRACE
#define MAX_DUMP_HEX_LEN 16
static void dump_hex( const unsigned char* ptr, size_t len )
{
int nn, len2 = len;
// Build a string instead of logging each character.
// MAX chars in 2 digit hex, one space, MAX chars, one '\0'.
char buffer[MAX_DUMP_HEX_LEN *2 + 1 + MAX_DUMP_HEX_LEN + 1 ], *pb = buffer;
if (len2 > MAX_DUMP_HEX_LEN) len2 = MAX_DUMP_HEX_LEN;
for (nn = 0; nn < len2; nn++) {
sprintf(pb, "%02x", ptr[nn]);
pb += 2;
}
sprintf(pb++, " ");
for (nn = 0; nn < len2; nn++) {
int c = ptr[nn];
if (c < 32 || c > 127)
c = '.';
*pb++ = c;
}
*pb++ = '\0';
DR("%s\n", buffer);
}
#endif
void
kick_transport(atransport* t)
{
if (t && !t->kicked)
{
int kicked;
adb_mutex_lock(&transport_lock);
kicked = t->kicked;
if (!kicked)
t->kicked = 1;
adb_mutex_unlock(&transport_lock);
if (!kicked)
t->kick(t);
}
}
void
run_transport_disconnects(atransport* t)
{
adisconnect* dis = t->disconnects.next;
D("%s: run_transport_disconnects\n", t->serial);
while (dis != &t->disconnects) {
adisconnect* next = dis->next;
dis->func( dis->opaque, t );
dis = next;
}
}
#if ADB_TRACE
static void
dump_packet(const char* name, const char* func, apacket* p)
{
unsigned command = p->msg.command;
int len = p->msg.data_length;
char cmd[9];
char arg0[12], arg1[12];
int n;
for (n = 0; n < 4; n++) {
int b = (command >> (n*8)) & 255;
if (b < 32 || b >= 127)
break;
cmd[n] = (char)b;
}
if (n == 4) {
cmd[4] = 0;
} else {
/* There is some non-ASCII name in the command, so dump
* the hexadecimal value instead */
snprintf(cmd, sizeof cmd, "%08x", command);
}
if (p->msg.arg0 < 256U)
snprintf(arg0, sizeof arg0, "%d", p->msg.arg0);
else
snprintf(arg0, sizeof arg0, "0x%x", p->msg.arg0);
if (p->msg.arg1 < 256U)
snprintf(arg1, sizeof arg1, "%d", p->msg.arg1);
else
snprintf(arg1, sizeof arg1, "0x%x", p->msg.arg1);
D("%s: %s: [%s] arg0=%s arg1=%s (len=%d) ",
name, func, cmd, arg0, arg1, len);
dump_hex(p->data, len);
}
#endif /* ADB_TRACE */
static int
read_packet(int fd, const char* name, apacket** ppacket)
{
char *p = (char*)ppacket; /* really read a packet address */
int r;
int len = sizeof(*ppacket);
char buff[8];
if (!name) {
snprintf(buff, sizeof buff, "fd=%d", fd);
name = buff;
}
while(len > 0) {
r = adb_read(fd, p, len);
if(r > 0) {
len -= r;
p += r;
} else {
D("%s: read_packet (fd=%d), error ret=%d errno=%d: %s\n", name, fd, r, errno, strerror(errno));
if((r < 0) && (errno == EINTR)) continue;
return -1;
}
}
#if ADB_TRACE
if (ADB_TRACING) {
dump_packet(name, "from remote", *ppacket);
}
#endif
return 0;
}
static int
write_packet(int fd, const char* name, apacket** ppacket)
{
char *p = (char*) ppacket; /* we really write the packet address */
int r, len = sizeof(ppacket);
char buff[8];
if (!name) {
snprintf(buff, sizeof buff, "fd=%d", fd);
name = buff;
}
#if ADB_TRACE
if (ADB_TRACING) {
dump_packet(name, "to remote", *ppacket);
}
#endif
len = sizeof(ppacket);
while(len > 0) {
r = adb_write(fd, p, len);
if(r > 0) {
len -= r;
p += r;
} else {
D("%s: write_packet (fd=%d) error ret=%d errno=%d: %s\n", name, fd, r, errno, strerror(errno));
if((r < 0) && (errno == EINTR)) continue;
return -1;
}
}
return 0;
}
static void transport_socket_events(int fd, unsigned events, void *_t)
{
atransport *t = _t;
D("transport_socket_events(fd=%d, events=%04x,...)\n", fd, events);
if(events & FDE_READ){
apacket *p = 0;
if(read_packet(fd, t->serial, &p)){
D("%s: failed to read packet from transport socket on fd %d\n", t->serial, fd);
} else {
handle_packet(p, (atransport *) _t);
}
}
}
void send_packet(apacket *p, atransport *t)
{
unsigned char *x;
unsigned sum;
unsigned count;
p->msg.magic = p->msg.command ^ 0xffffffff;
count = p->msg.data_length;
x = (unsigned char *) p->data;
sum = 0;
while(count-- > 0){
sum += *x++;
}
p->msg.data_check = sum;
print_packet("send", p);
if (t == NULL) {
D("Transport is null \n");
// Zap errno because print_packet() and other stuff have errno effect.
errno = 0;
fatal_errno("Transport is null");
}
if(write_packet(t->transport_socket, t->serial, &p)){
fatal_errno("cannot enqueue packet on transport socket");
}
}
/* The transport is opened by transport_register_func before
** the input and output threads are started.
**
** The output thread issues a SYNC(1, token) message to let
** the input thread know to start things up. In the event
** of transport IO failure, the output thread will post a
** SYNC(0,0) message to ensure shutdown.
**
** The transport will not actually be closed until both
** threads exit, but the input thread will kick the transport
** on its way out to disconnect the underlying device.
*/
static void *output_thread(void *_t)
{
atransport *t = _t;
apacket *p;
D("%s: starting transport output thread on fd %d, SYNC online (%d)\n",
t->serial, t->fd, t->sync_token + 1);
p = get_apacket();
p->msg.command = A_SYNC;
p->msg.arg0 = 1;
p->msg.arg1 = ++(t->sync_token);
p->msg.magic = A_SYNC ^ 0xffffffff;
if(write_packet(t->fd, t->serial, &p)) {
put_apacket(p);
D("%s: failed to write SYNC packet\n", t->serial);
goto oops;
}
D("%s: data pump started\n", t->serial);
for(;;) {
p = get_apacket();
if(t->read_from_remote(p, t) == 0){
D("%s: received remote packet, sending to transport\n",
t->serial);
if(write_packet(t->fd, t->serial, &p)){
put_apacket(p);
D("%s: failed to write apacket to transport\n", t->serial);
goto oops;
}
} else {
D("%s: remote read failed for transport\n", t->serial);
put_apacket(p);
break;
}
}
D("%s: SYNC offline for transport\n", t->serial);
p = get_apacket();
p->msg.command = A_SYNC;
p->msg.arg0 = 0;
p->msg.arg1 = 0;
p->msg.magic = A_SYNC ^ 0xffffffff;
if(write_packet(t->fd, t->serial, &p)) {
put_apacket(p);
D("%s: failed to write SYNC apacket to transport", t->serial);
}
oops:
D("%s: transport output thread is exiting\n", t->serial);
kick_transport(t);
transport_unref(t);
return 0;
}
static void *input_thread(void *_t)
{
atransport *t = _t;
apacket *p;
int active = 0;
D("%s: starting transport input thread, reading from fd %d\n",
t->serial, t->fd);
for(;;){
if(read_packet(t->fd, t->serial, &p)) {
D("%s: failed to read apacket from transport on fd %d\n",
t->serial, t->fd );
break;
}
if(p->msg.command == A_SYNC){
if(p->msg.arg0 == 0) {
D("%s: transport SYNC offline\n", t->serial);
put_apacket(p);
break;
} else {
if(p->msg.arg1 == t->sync_token) {
D("%s: transport SYNC online\n", t->serial);
active = 1;
} else {
D("%s: transport ignoring SYNC %d != %d\n",
t->serial, p->msg.arg1, t->sync_token);
}
}
} else {
if(active) {
D("%s: transport got packet, sending to remote\n", t->serial);
t->write_to_remote(p, t);
} else {
D("%s: transport ignoring packet while offline\n", t->serial);
}
}
put_apacket(p);
}
// this is necessary to avoid a race condition that occured when a transport closes
// while a client socket is still active.
close_all_sockets(t);
D("%s: transport input thread is exiting, fd %d\n", t->serial, t->fd);
kick_transport(t);
transport_unref(t);
return 0;
}
static int transport_registration_send = -1;
static int transport_registration_recv = -1;
static fdevent transport_registration_fde;
#if ADB_HOST
static int list_transports_msg(char* buffer, size_t bufferlen)
{
char head[5];
int len;
len = list_transports(buffer+4, bufferlen-4);
snprintf(head, sizeof(head), "%04x", len);
memcpy(buffer, head, 4);
len += 4;
return len;
}
/* this adds support required by the 'track-devices' service.
* this is used to send the content of "list_transport" to any
* number of client connections that want it through a single
* live TCP connection
*/
typedef struct device_tracker device_tracker;
struct device_tracker {
asocket socket;
int update_needed;
device_tracker* next;
};
/* linked list of all device trackers */
static device_tracker* device_tracker_list;
static void
device_tracker_remove( device_tracker* tracker )
{
device_tracker** pnode = &device_tracker_list;
device_tracker* node = *pnode;
adb_mutex_lock( &transport_lock );
while (node) {
if (node == tracker) {
*pnode = node->next;
break;
}
pnode = &node->next;
node = *pnode;
}
adb_mutex_unlock( &transport_lock );
}
static void
device_tracker_close( asocket* socket )
{
device_tracker* tracker = (device_tracker*) socket;
asocket* peer = socket->peer;
D( "device tracker %p removed\n", tracker);
if (peer) {
peer->peer = NULL;
peer->close(peer);
}
device_tracker_remove(tracker);
free(tracker);
}
static int
device_tracker_enqueue( asocket* socket, apacket* p )
{
/* you can't read from a device tracker, close immediately */
put_apacket(p);
device_tracker_close(socket);
return -1;
}
static int
device_tracker_send( device_tracker* tracker,
const char* buffer,
int len )
{
apacket* p = get_apacket();
asocket* peer = tracker->socket.peer;
memcpy(p->data, buffer, len);
p->len = len;
return peer->enqueue( peer, p );
}
static void
device_tracker_ready( asocket* socket )
{
device_tracker* tracker = (device_tracker*) socket;
/* we want to send the device list when the tracker connects
* for the first time, even if no update occured */
if (tracker->update_needed > 0) {
char buffer[1024];
int len;
tracker->update_needed = 0;
len = list_transports_msg(buffer, sizeof(buffer));
device_tracker_send(tracker, buffer, len);
}
}
asocket*
create_device_tracker(void)
{
device_tracker* tracker = calloc(1,sizeof(*tracker));
if(tracker == 0) fatal("cannot allocate device tracker");
D( "device tracker %p created\n", tracker);
tracker->socket.enqueue = device_tracker_enqueue;
tracker->socket.ready = device_tracker_ready;
tracker->socket.close = device_tracker_close;
tracker->update_needed = 1;
tracker->next = device_tracker_list;
device_tracker_list = tracker;
return &tracker->socket;
}
/* call this function each time the transport list has changed */
void update_transports(void)
{
char buffer[1024];
int len;
device_tracker* tracker;
len = list_transports_msg(buffer, sizeof(buffer));
tracker = device_tracker_list;
while (tracker != NULL) {
device_tracker* next = tracker->next;
/* note: this may destroy the tracker if the connection is closed */
device_tracker_send(tracker, buffer, len);
tracker = next;
}
}
#else
void update_transports(void)
{
// nothing to do on the device side
}
#endif // ADB_HOST
typedef struct tmsg tmsg;
struct tmsg
{
atransport *transport;
int action;
};
static int
transport_read_action(int fd, struct tmsg* m)
{
char *p = (char*)m;
int len = sizeof(*m);
int r;
while(len > 0) {
r = adb_read(fd, p, len);
if(r > 0) {
len -= r;
p += r;
} else {
if((r < 0) && (errno == EINTR)) continue;
D("transport_read_action: on fd %d, error %d: %s\n",
fd, errno, strerror(errno));
return -1;
}
}
return 0;
}
static int
transport_write_action(int fd, struct tmsg* m)
{
char *p = (char*)m;
int len = sizeof(*m);
int r;
while(len > 0) {
r = adb_write(fd, p, len);
if(r > 0) {
len -= r;
p += r;
} else {
if((r < 0) && (errno == EINTR)) continue;
D("transport_write_action: on fd %d, error %d: %s\n",
fd, errno, strerror(errno));
return -1;
}
}
return 0;
}
static void transport_registration_func(int _fd, unsigned ev, void *data)
{
tmsg m;
adb_thread_t output_thread_ptr;
adb_thread_t input_thread_ptr;
int s[2];
atransport *t;
if(!(ev & FDE_READ)) {
return;
}
if(transport_read_action(_fd, &m)) {
fatal_errno("cannot read transport registration socket");
}
t = m.transport;
if(m.action == 0){
D("transport: %s removing and free'ing %d\n", t->serial, t->transport_socket);
/* IMPORTANT: the remove closes one half of the
** socket pair. The close closes the other half.
*/
fdevent_remove(&(t->transport_fde));
adb_close(t->fd);
adb_mutex_lock(&transport_lock);
t->next->prev = t->prev;
t->prev->next = t->next;
adb_mutex_unlock(&transport_lock);
run_transport_disconnects(t);
if (t->product)
free(t->product);
if (t->serial)
free(t->serial);
memset(t,0xee,sizeof(atransport));
free(t);
update_transports();
return;
}
/* don't create transport threads for inaccessible devices */
if (t->connection_state != CS_NOPERM) {
/* initial references are the two threads */
t->ref_count = 2;
if(adb_socketpair(s)) {
fatal_errno("cannot open transport socketpair");
}
D("transport: %s (%d,%d) starting\n", t->serial, s[0], s[1]);
t->transport_socket = s[0];
t->fd = s[1];
fdevent_install(&(t->transport_fde),
t->transport_socket,
transport_socket_events,
t);
fdevent_set(&(t->transport_fde), FDE_READ);
if(adb_thread_create(&input_thread_ptr, input_thread, t)){
fatal_errno("cannot create input thread");
}
if(adb_thread_create(&output_thread_ptr, output_thread, t)){
fatal_errno("cannot create output thread");
}
}
/* put us on the master device list */
adb_mutex_lock(&transport_lock);
t->next = &transport_list;
t->prev = transport_list.prev;
t->next->prev = t;
t->prev->next = t;
adb_mutex_unlock(&transport_lock);
t->disconnects.next = t->disconnects.prev = &t->disconnects;
update_transports();
}
void init_transport_registration(void)
{
int s[2];
if(adb_socketpair(s)){
fatal_errno("cannot open transport registration socketpair");
}
transport_registration_send = s[0];
transport_registration_recv = s[1];
fdevent_install(&transport_registration_fde,
transport_registration_recv,
transport_registration_func,
0);
fdevent_set(&transport_registration_fde, FDE_READ);
}
/* the fdevent select pump is single threaded */
static void register_transport(atransport *transport)
{
tmsg m;
m.transport = transport;
m.action = 1;
D("transport: %s registered\n", transport->serial);
if(transport_write_action(transport_registration_send, &m)) {
fatal_errno("cannot write transport registration socket\n");
}
}
static void remove_transport(atransport *transport)
{
tmsg m;
m.transport = transport;
m.action = 0;
D("transport: %s removed\n", transport->serial);
if(transport_write_action(transport_registration_send, &m)) {
fatal_errno("cannot write transport registration socket\n");
}
}
static void transport_unref_locked(atransport *t)
{
t->ref_count--;
if (t->ref_count == 0) {
D("transport: %s unref (kicking and closing)\n", t->serial);
if (!t->kicked) {
t->kicked = 1;
t->kick(t);
}
t->close(t);
remove_transport(t);
} else {
D("transport: %s unref (count=%d)\n", t->serial, t->ref_count);
}
}
static void transport_unref(atransport *t)
{
if (t) {
adb_mutex_lock(&transport_lock);
transport_unref_locked(t);
adb_mutex_unlock(&transport_lock);
}
}
void add_transport_disconnect(atransport* t, adisconnect* dis)
{
adb_mutex_lock(&transport_lock);
dis->next = &t->disconnects;
dis->prev = dis->next->prev;
dis->prev->next = dis;
dis->next->prev = dis;
adb_mutex_unlock(&transport_lock);
}
void remove_transport_disconnect(atransport* t, adisconnect* dis)
{
dis->prev->next = dis->next;
dis->next->prev = dis->prev;
dis->next = dis->prev = dis;
}
atransport *acquire_one_transport(int state, transport_type ttype, const char* serial, char** error_out)
{
atransport *t;
atransport *result = NULL;
int ambiguous = 0;
retry:
if (error_out)
*error_out = "device not found";
adb_mutex_lock(&transport_lock);
for (t = transport_list.next; t != &transport_list; t = t->next) {
if (t->connection_state == CS_NOPERM) {
if (error_out)
*error_out = "insufficient permissions for device";
continue;
}
/* check for matching serial number */
if (serial) {
if (t->serial && !strcmp(serial, t->serial)) {
result = t;
break;
}
} else {
if (ttype == kTransportUsb && t->type == kTransportUsb) {
if (result) {
if (error_out)
*error_out = "more than one device";
ambiguous = 1;
result = NULL;
break;
}
result = t;
} else if (ttype == kTransportLocal && t->type == kTransportLocal) {
if (result) {
if (error_out)
*error_out = "more than one emulator";
ambiguous = 1;
result = NULL;
break;
}
result = t;
} else if (ttype == kTransportAny) {
if (result) {
if (error_out)
*error_out = "more than one device and emulator";
ambiguous = 1;
result = NULL;
break;
}
result = t;
}
}
}
adb_mutex_unlock(&transport_lock);
if (result) {
/* offline devices are ignored -- they are either being born or dying */
if (result && result->connection_state == CS_OFFLINE) {
if (error_out)
*error_out = "device offline";
result = NULL;
}
/* check for required connection state */
if (result && state != CS_ANY && result->connection_state != state) {
if (error_out)
*error_out = "invalid device state";
result = NULL;
}
}
if (result) {
/* found one that we can take */
if (error_out)
*error_out = NULL;
} else if (state != CS_ANY && (serial || !ambiguous)) {
adb_sleep_ms(1000);
goto retry;
}
return result;
}
#if ADB_HOST
static const char *statename(atransport *t)
{
switch(t->connection_state){
case CS_OFFLINE: return "offline";
case CS_BOOTLOADER: return "bootloader";
case CS_DEVICE: return "device";
case CS_HOST: return "host";
case CS_RECOVERY: return "recovery";
case CS_NOPERM: return "no permissions";
default: return "unknown";
}
}
int list_transports(char *buf, size_t bufsize)
{
char* p = buf;
char* end = buf + bufsize;
int len;
atransport *t;
/* XXX OVERRUN PROBLEMS XXX */
adb_mutex_lock(&transport_lock);
for(t = transport_list.next; t != &transport_list; t = t->next) {
const char* serial = t->serial;
if (!serial || !serial[0])
serial = "????????????";
len = snprintf(p, end - p, "%s\t%s\n", serial, statename(t));
if (p + len >= end) {
/* discard last line if buffer is too short */
break;
}
p += len;
}
p[0] = 0;
adb_mutex_unlock(&transport_lock);
return p - buf;
}
/* hack for osx */
void close_usb_devices()
{
atransport *t;
adb_mutex_lock(&transport_lock);
for(t = transport_list.next; t != &transport_list; t = t->next) {
if ( !t->kicked ) {
t->kicked = 1;
t->kick(t);
}
}
adb_mutex_unlock(&transport_lock);
}
#endif // ADB_HOST
void register_socket_transport(int s, const char *serial, int port, int local)
{
atransport *t = calloc(1, sizeof(atransport));
char buff[32];
if (!serial) {
snprintf(buff, sizeof buff, "T-%p", t);
serial = buff;
}
D("transport: %s init'ing for socket %d, on port %d\n", serial, s, port);
if ( init_socket_transport(t, s, port, local) < 0 ) {
adb_close(s);
free(t);
return;
}
if(serial) {
t->serial = strdup(serial);
}
register_transport(t);
}
#if ADB_HOST
atransport *find_transport(const char *serial)
{
atransport *t;
adb_mutex_lock(&transport_lock);
for(t = transport_list.next; t != &transport_list; t = t->next) {
if (t->serial && !strcmp(serial, t->serial)) {
break;
}
}
adb_mutex_unlock(&transport_lock);
if (t != &transport_list)
return t;
else
return 0;
}
void unregister_transport(atransport *t)
{
adb_mutex_lock(&transport_lock);
t->next->prev = t->prev;
t->prev->next = t->next;
adb_mutex_unlock(&transport_lock);
kick_transport(t);
transport_unref(t);
}
// unregisters all non-emulator TCP transports
void unregister_all_tcp_transports()
{
atransport *t, *next;
adb_mutex_lock(&transport_lock);
for (t = transport_list.next; t != &transport_list; t = next) {
next = t->next;
if (t->type == kTransportLocal && t->adb_port == 0) {
t->next->prev = t->prev;
t->prev->next = next;
// we cannot call kick_transport when holding transport_lock
if (!t->kicked)
{
t->kicked = 1;
t->kick(t);
}
transport_unref_locked(t);
}
}
adb_mutex_unlock(&transport_lock);
}
#endif
void register_usb_transport(usb_handle *usb, const char *serial, unsigned writeable)
{
atransport *t = calloc(1, sizeof(atransport));
D("transport: %p init'ing for usb_handle %p (sn='%s')\n", t, usb,
serial ? serial : "");
init_usb_transport(t, usb, (writeable ? CS_OFFLINE : CS_NOPERM));
if(serial) {
t->serial = strdup(serial);
}
register_transport(t);
}
/* this should only be used for transports with connection_state == CS_NOPERM */
void unregister_usb_transport(usb_handle *usb)
{
atransport *t;
adb_mutex_lock(&transport_lock);
for(t = transport_list.next; t != &transport_list; t = t->next) {
if (t->usb == usb && t->connection_state == CS_NOPERM) {
t->next->prev = t->prev;
t->prev->next = t->next;
break;
}
}
adb_mutex_unlock(&transport_lock);
}
#undef TRACE_TAG
#define TRACE_TAG TRACE_RWX
int readx(int fd, void *ptr, size_t len)
{
char *p = ptr;
int r;
#if ADB_TRACE
int len0 = len;
#endif
D("readx: fd=%d wanted=%d\n", fd, (int)len);
while(len > 0) {
r = adb_read(fd, p, len);
if(r > 0) {
len -= r;
p += r;
} else {
if (r < 0) {
D("readx: fd=%d error %d: %s\n", fd, errno, strerror(errno));
if (errno == EINTR)
continue;
} else {
D("readx: fd=%d disconnected\n", fd);
}
return -1;
}
}
#if ADB_TRACE
D("readx: fd=%d wanted=%d got=%d\n", fd, len0, len0 - len);
dump_hex( ptr, len0 );
#endif
return 0;
}
int writex(int fd, const void *ptr, size_t len)
{
char *p = (char*) ptr;
int r;
#if ADB_TRACE
D("writex: fd=%d len=%d: ", fd, (int)len);
dump_hex( ptr, len );
#endif
while(len > 0) {
r = adb_write(fd, p, len);
if(r > 0) {
len -= r;
p += r;
} else {
if (r < 0) {
D("writex: fd=%d error %d: %s\n", fd, errno, strerror(errno));
if (errno == EINTR)
continue;
} else {
D("writex: fd=%d disconnected\n", fd);
}
return -1;
}
}
return 0;
}
int check_header(apacket *p)
{
if(p->msg.magic != (p->msg.command ^ 0xffffffff)) {
D("check_header(): invalid magic\n");
return -1;
}
if(p->msg.data_length > MAX_PAYLOAD) {
D("check_header(): %d > MAX_PAYLOAD\n", p->msg.data_length);
return -1;
}
return 0;
}
int check_data(apacket *p)
{
unsigned count, sum;
unsigned char *x;
count = p->msg.data_length;
x = p->data;
sum = 0;
while(count-- > 0) {
sum += *x++;
}
if(sum != p->msg.data_check) {
return -1;
} else {
return 0;
}
}
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