bool playturn_network_adapter::read(config& dst)
{
assert(dst.empty());
if(is_at_end())
{
read_from_network();
}
if(is_at_end())
{
//that means we couldn't read anything from the network.
return false;
}
//skip empty data.
while(next_ == data_.begin()->ordered_end())
{
data_.pop_front();
next_ = data_.front().ordered_begin();
assert(!is_at_end());
}
config& child = dst.add_child(next_->key);
//TODO: implement a non const version of ordered children
config& child_old = const_cast<config&>(next_->cfg);
if(next_->key == "turn")
{
//split [turn] indo different [turn] for each child.
assert(next_->cfg.all_children_count() > next_command_num_);
config::all_children_iterator itor = child_old.ordered_begin();
//TODO: implement operator + (all_children_iterator, int ) properly
std::advance(itor, next_command_num_);
//TODO: implement a non const version of ordered children
config& childchild_old = const_cast<config&>(itor->cfg);
config& childchild = child.add_child(itor->key);
childchild.swap(childchild_old);
++next_command_num_;
if(next_->cfg.all_children_count() == next_command_num_)
{
next_command_num_ = 0;
++next_;
}
return true;
}
else
{
child.swap(child_old);
++next_;
return true;
}
}
/** This function handles a single connection */
void handle_connection(int fd) {
unsigned char key[16];
char challenge[SIZEOF_CHALLENGE];
int len;
int version;
int length;
char *filename;
int target_fd;
uint32_t calculated_length;
RC4 rc4;
uint64_t image_size;
StringIO queue;
// Read the challenge:
len = read(fd, challenge, SIZEOF_CHALLENGE);
if(len < SIZEOF_CHALLENGE) {
DEBUG("Unable to read challenge from socket\n");
return;
};
// Try to calculate the session key from this:
if(!ecc_get_key((char *)key, challenge, Priv)) {
DEBUG("Unable to decode challenge\n");
return;
};
// Prepare the key:
rc4 = CONSTRUCT(RC4, RC4, Con, NULL, key, sizeof(key));
queue = CONSTRUCT(StringIO, StringIO, Con, rc4);
if(!read_from_network(fd, (unsigned char *)&version, sizeof(version), rc4)) {
DEBUG("Cant read version\n");
return;
};
version = ntohl(version);
if(version != REMOTE_VERSION) {
DEBUG("Client version not supported\n");
return;
};
if(!read_from_network(fd, (unsigned char *)&length, sizeof(length), rc4))
return;
length = ntohl(length);
// Make sure the filename is not too large
if(length > 1024) return;
filename = talloc_zero_size(NULL, length+1);
if(!read_from_network(fd, (unsigned char *)filename, length, rc4))
return;
target_fd = open(filename, O_RDONLY);
if(target_fd < 0) {
DEBUG("Cant open %s..\n", filename);
return;
};
//Figure out the image size:
image_size = lseek(target_fd, 0, SEEK_END);
while(1) {
uint64_t offset;
uint32_t length;
char buff[BUFF_SIZE];
if(!read_from_network(fd, (unsigned char *)&offset, sizeof(offset), rc4))
return;
offset = ntohll(offset);
if(!read_from_network(fd, (unsigned char *)&length, sizeof(length), rc4))
return;
length = ntohl(length);
// Send out the total length of the data - which may be less than
// requested if the image is smaller
{
uint32_t c_calc_len;
calculated_length = min(image_size, offset+length) - offset;
c_calc_len = htonl(calculated_length);
queue_for_sending(queue, (unsigned char *)&c_calc_len, sizeof(c_calc_len), rc4);
};
if(lseek(target_fd, offset, SEEK_SET) != offset) {
DEBUG("Unable to seek to %llu\n", offset);
return;
};
//DEBUG("Will need to read %u from %llu\n", calculated_length, offset);
while(calculated_length > 0) {
int l = read(target_fd, buff, min(calculated_length, BUFF_SIZE));
if(l==0) {
break;
};
if(l<0) return;
queue_for_sending(queue, (unsigned char *)buff, l, rc4);
// If the queue is too full, we need to flush it
if(queue->size > 64000)
if(!write_to_network(fd, queue))
return;
calculated_length -= l;
};
if(!write_to_network(fd, queue))
return;
};
};
