static void libirc_dcc_process_descriptors (irc_session_t * ircsession, fd_set *in_set, fd_set *out_set)
{
irc_dcc_session_t * dcc;
/*
* We need to use such a complex scheme here, because on every callback
* a number of DCC sessions could be destroyed.
*/
libirc_mutex_lock (&ircsession->mutex_dcc);
for ( dcc = ircsession->dcc_sessions; dcc; dcc = dcc->next )
{
if ( dcc->state == LIBIRC_STATE_LISTENING
&& FD_ISSET (dcc->sock, in_set) )
{
socklen_t len = sizeof(dcc->remote_addr);
int nsock, err = 0;
// New connection is available; accept it.
if ( socket_accept (&dcc->sock, &nsock, (struct sockaddr *) &dcc->remote_addr, &len) )
err = LIBIRC_ERR_ACCEPT;
// On success, change the active socket and change the state
if ( err == 0 )
{
// close the listen socket, and replace it by a newly
// accepted
socket_close (&dcc->sock);
dcc->sock = nsock;
dcc->state = LIBIRC_STATE_CONNECTED;
}
// If this is DCC chat, inform the caller about accept()
// success or failure.
// Otherwise (DCC send) there is no reason.
if ( dcc->dccmode == LIBIRC_DCC_CHAT )
{
libirc_mutex_unlock (&ircsession->mutex_dcc);
(*dcc->cb)(ircsession, dcc->id, err, dcc->ctx, 0, 0);
libirc_mutex_lock (&ircsession->mutex_dcc);
}
if ( err )
libirc_dcc_destroy_nolock (ircsession, dcc->id);
}
if ( dcc->state == LIBIRC_STATE_CONNECTING
&& FD_ISSET (dcc->sock, out_set) )
{
// Now we have to determine whether the socket is connected
// or the connect is failed
struct sockaddr_in saddr;
socklen_t slen = sizeof(saddr);
int err = 0;
if ( getpeername (dcc->sock, (struct sockaddr*)&saddr, &slen) < 0 )
err = LIBIRC_ERR_CONNECT;
// On success, change the state
if ( err == 0 )
dcc->state = LIBIRC_STATE_CONNECTED;
// If this is DCC chat, inform the caller about connect()
// success or failure.
// Otherwise (DCC send) there is no reason.
if ( dcc->dccmode == LIBIRC_DCC_CHAT )
{
libirc_mutex_unlock (&ircsession->mutex_dcc);
(*dcc->cb)(ircsession, dcc->id, err, dcc->ctx, 0, 0);
libirc_mutex_lock (&ircsession->mutex_dcc);
}
if ( err )
libirc_dcc_destroy_nolock (ircsession, dcc->id);
}
if ( dcc->state == LIBIRC_STATE_CONNECTED
|| dcc->state == LIBIRC_STATE_CONFIRM_SIZE )
{
if ( FD_ISSET (dcc->sock, in_set) )
{
int length, offset = 0, err = 0;
unsigned int amount = sizeof (dcc->incoming_buf) - dcc->incoming_offset;
length = socket_recv (&dcc->sock, dcc->incoming_buf + dcc->incoming_offset, amount);
if ( length < 0 )
{
err = LIBIRC_ERR_READ;
}
else if ( length == 0 )
{
err = LIBIRC_ERR_CLOSED;
if ( dcc->dccsend_file_fp )
{
fclose (dcc->dccsend_file_fp);
dcc->dccsend_file_fp = 0;
}
}
else
{
dcc->incoming_offset += length;
if ( dcc->dccmode != LIBIRC_DCC_CHAT )
offset = dcc->incoming_offset;
else
offset = libirc_findcrorlf (dcc->incoming_buf, dcc->incoming_offset);
/*
* In LIBIRC_STATE_CONFIRM_SIZE state we don't call any
* callbacks (except there is an error). We just receive
* the data, and compare it with the amount sent.
*/
if ( dcc->state == LIBIRC_STATE_CONFIRM_SIZE )
{
if ( dcc->dccmode != LIBIRC_DCC_SENDFILE )
abort();
if ( dcc->incoming_offset == 4 )
{
unsigned int received_size = ntohl (*((unsigned int*)dcc->incoming_buf));
// Sent size confirmed
if ( dcc->file_confirm_offset == received_size )
{
dcc->state = LIBIRC_STATE_CONNECTED;
dcc->incoming_offset = 0;
}
else
err = LIBIRC_ERR_WRITE;
}
}
else
{
/*
* If it is DCC_CHAT, we send a 0-terminated string
* (which is smaller than offset). Otherwise we send
* a full buffer.
*/
libirc_mutex_unlock (&ircsession->mutex_dcc);
if ( dcc->dccmode != LIBIRC_DCC_CHAT )
{
if ( dcc->dccmode != LIBIRC_DCC_RECVFILE )
abort();
(*dcc->cb)(ircsession, dcc->id, err, dcc->ctx, dcc->incoming_buf, offset);
/*
* If the session is not terminated in callback,
* put the sent amount into the sent_packet_size_net_byteorder
*/
if ( dcc->state != LIBIRC_STATE_REMOVED )
{
dcc->state = LIBIRC_STATE_CONFIRM_SIZE;
dcc->file_confirm_offset += offset;
*((unsigned int*)dcc->outgoing_buf) = htonl (dcc->file_confirm_offset);
dcc->outgoing_offset = 4;
}
}
else
(*dcc->cb)(ircsession, dcc->id, err, dcc->ctx, dcc->incoming_buf, strlen(dcc->incoming_buf));
libirc_mutex_lock (&ircsession->mutex_dcc);
if ( dcc->incoming_offset - offset > 0 )
memmove (dcc->incoming_buf, dcc->incoming_buf + offset, dcc->incoming_offset - offset);
dcc->incoming_offset -= offset;
}
}
/*
* If error arises somewhere above, we inform the caller
* of failure, and destroy this session.
*/
if ( err )
{
libirc_mutex_unlock (&ircsession->mutex_dcc);
(*dcc->cb)(ircsession, dcc->id, err, dcc->ctx, 0, 0);
libirc_mutex_lock (&ircsession->mutex_dcc);
libirc_dcc_destroy_nolock (ircsession, dcc->id);
}
}
/*
* Session might be closed (with sock = -1) after the in_set
* processing, so before out_set processing we should check
* for this case
*/
if ( dcc->state == LIBIRC_STATE_REMOVED )
continue;
/*
* Write bit set - we can send() something, and it won't block.
*/
if ( FD_ISSET (dcc->sock, out_set) )
{
int length, offset, err = 0;
/*
* Because in some cases outgoing_buf could be changed
* asynchronously (by another thread), we should lock
* it.
*/
libirc_mutex_lock (&dcc->mutex_outbuf);
offset = dcc->outgoing_offset;
if ( offset > 0 )
{
length = socket_send (&dcc->sock, dcc->outgoing_buf, offset);
if ( length < 0 )
err = LIBIRC_ERR_WRITE;
else if ( length == 0 )
err = LIBIRC_ERR_CLOSED;
else
{
/*
* If this was DCC_SENDFILE, and we just sent a packet,
* change the state to wait for confirmation (and store
* sent packet size)
*/
if ( dcc->state == LIBIRC_STATE_CONNECTED
&& dcc->dccmode == LIBIRC_DCC_SENDFILE )
{
dcc->file_confirm_offset += offset;
dcc->state = LIBIRC_STATE_CONFIRM_SIZE;
libirc_mutex_unlock (&ircsession->mutex_dcc);
libirc_mutex_unlock (&dcc->mutex_outbuf);
(*dcc->cb)(ircsession, dcc->id, err, dcc->ctx, 0, offset);
libirc_mutex_lock (&ircsession->mutex_dcc);
libirc_mutex_lock (&dcc->mutex_outbuf);
}
if ( dcc->outgoing_offset - length > 0 )
memmove (dcc->outgoing_buf, dcc->outgoing_buf + length, dcc->outgoing_offset - length);
dcc->outgoing_offset -= length;
/*
* If we just sent the confirmation data, change state
* back.
*/
if ( dcc->state == LIBIRC_STATE_CONFIRM_SIZE
&& dcc->dccmode == LIBIRC_DCC_RECVFILE
&& dcc->outgoing_offset == 0 )
{
/*
* If the file is already received, we should inform
* the caller, and close the session.
*/
if ( dcc->received_file_size == dcc->file_confirm_offset )
{
libirc_mutex_unlock (&ircsession->mutex_dcc);
libirc_mutex_unlock (&dcc->mutex_outbuf);
(*dcc->cb)(ircsession, dcc->id, 0, dcc->ctx, 0, 0);
libirc_dcc_destroy_nolock (ircsession, dcc->id);
}
else
{
/* Continue to receive the file */
dcc->state = LIBIRC_STATE_CONNECTED;
}
}
}
}
libirc_mutex_unlock (&dcc->mutex_outbuf);
/*
* If error arises somewhere above, we inform the caller
* of failure, and destroy this session.
*/
if ( err )
{
libirc_mutex_unlock (&ircsession->mutex_dcc);
(*dcc->cb)(ircsession, dcc->id, err, dcc->ctx, 0, 0);
libirc_mutex_lock (&ircsession->mutex_dcc);
libirc_dcc_destroy_nolock (ircsession, dcc->id);
}
}
}
}
libirc_mutex_unlock (&ircsession->mutex_dcc);
}
static void libirc_dcc_process_descriptors (irc_session_t * ircsession, fd_set *in_set, fd_set *out_set)
{
irc_dcc_session_t * dcc;
/*
* We need to use such a complex scheme here, because on every callback
* a number of DCC sessions could be destroyed.
*/
libirc_mutex_lock (&ircsession->mutex_dcc);
for ( dcc = ircsession->dcc_sessions; dcc; dcc = dcc->next )
{
if ( dcc->state == LIBIRC_STATE_LISTENING
&& FD_ISSET (dcc->sock, in_set) )
{
socklen_t len = sizeof(dcc->remote_addr);
int nsock, err = 0;
// New connection is available; accept it.
if ( socket_accept (&dcc->sock, (socket_t*)&nsock, (struct sockaddr *) &dcc->remote_addr, &len) )
err = LIBIRC_ERR_ACCEPT;
// On success, change the active socket and change the state
if ( err == 0 )
{
// close the listen socket, and replace it by a newly
// accepted
socket_close (&dcc->sock);
dcc->sock = nsock;
dcc->state = LIBIRC_STATE_CONNECTED;
}
// If this is DCC chat, inform the caller about accept()
// success or failure.
// Otherwise (DCC send) there is no reason.
if ( dcc->dccmode == LIBIRC_DCC_CHAT )
{
libirc_mutex_unlock (&ircsession->mutex_dcc);
(*dcc->cb)(ircsession, dcc->id, err, dcc->ctx, 0, 0);
libirc_mutex_lock (&ircsession->mutex_dcc);
}
if ( err )
libirc_dcc_destroy_nolock (ircsession, dcc->id);
}
if ( dcc->state == LIBIRC_STATE_CONNECTING
&& FD_ISSET (dcc->sock, out_set) )
{
// Now we have to determine whether the socket is connected
// or the connect is failed
struct sockaddr_in saddr;
socklen_t slen = sizeof(saddr);
int err = 0;
if ( getpeername (dcc->sock, (struct sockaddr*)&saddr, &slen) < 0 )
err = LIBIRC_ERR_CONNECT;
// On success, change the state
if ( err == 0 )
dcc->state = LIBIRC_STATE_CONNECTED;
// If this is DCC chat, inform the caller about connect()
// success or failure.
// Otherwise (DCC send) there is no reason.
if ( dcc->dccmode == LIBIRC_DCC_CHAT )
{
libirc_mutex_unlock (&ircsession->mutex_dcc);
(*dcc->cb)(ircsession, dcc->id, err, dcc->ctx, 0, 0);
libirc_mutex_lock (&ircsession->mutex_dcc);
}
if ( err )
libirc_dcc_destroy_nolock (ircsession, dcc->id);
}
if ( dcc->state == LIBIRC_STATE_CONNECTED
|| dcc->state == LIBIRC_STATE_CONFIRM_SIZE )
{
if ( FD_ISSET (dcc->sock, in_set) )
{
int length, offset = 0, err = 0;
unsigned int amount = sizeof (dcc->incoming_buf) - dcc->incoming_offset;
length = socket_recv (&dcc->sock, dcc->incoming_buf + dcc->incoming_offset, amount);
if ( length < 0 )
{
err = LIBIRC_ERR_READ;
}
else if ( length == 0 )
{
err = LIBIRC_ERR_CLOSED;
if ( dcc->dccsend_file_fp )
{
fclose (dcc->dccsend_file_fp);
dcc->dccsend_file_fp = 0;
}
}
else
{
dcc->incoming_offset += length;
if ( dcc->dccmode != LIBIRC_DCC_CHAT )
offset = dcc->incoming_offset;
else
offset = libirc_findcrorlf (dcc->incoming_buf, dcc->incoming_offset);
/*
* In LIBIRC_STATE_CONFIRM_SIZE state we don't call any
* callbacks (except there is an error). We just receive
* the data, and compare it with the amount sent.
*/
if ( dcc->state == LIBIRC_STATE_CONFIRM_SIZE )
{
if ( dcc->dccmode != LIBIRC_DCC_SENDFILE )
abort();
if ( dcc->incoming_offset == 4 )
{
// The order is big-endian
const unsigned char * bptr = (const unsigned char *) dcc->incoming_buf;
unsigned int received_size = (bptr[0] << 24) | (bptr[1] << 16) | (bptr[2] << 8) | bptr[3];
// Sent size confirmed
if ( dcc->file_confirm_offset == received_size )
{
dcc->state = LIBIRC_STATE_CONNECTED;
dcc->incoming_offset = 0;
}
else
err = LIBIRC_ERR_WRITE;
}
}
else
{
/*
* If it is DCC_CHAT, we send a 0-terminated string
* (which is smaller than offset). Otherwise we send
* a full buffer.
*/
libirc_mutex_unlock (&ircsession->mutex_dcc);
if ( dcc->dccmode != LIBIRC_DCC_CHAT )
{
if ( dcc->dccmode != LIBIRC_DCC_RECVFILE )
abort();
(*dcc->cb)(ircsession, dcc->id, err, dcc->ctx, dcc->incoming_buf, offset);
/*
* If the session is not terminated in callback,
* put the sent amount into the sent_packet_size_net_byteorder
*/
if ( dcc->state != LIBIRC_STATE_REMOVED )
{
dcc->state = LIBIRC_STATE_CONFIRM_SIZE;
dcc->file_confirm_offset += offset;
// Store as big endian
dcc->outgoing_buf[0] = (char) dcc->file_confirm_offset >> 24;
dcc->outgoing_buf[1] = (char) dcc->file_confirm_offset >> 16;
dcc->outgoing_buf[2] = (char) dcc->file_confirm_offset >> 8;
dcc->outgoing_buf[3] = (char) dcc->file_confirm_offset;
dcc->outgoing_offset = 4;
}
}
else
(*dcc->cb)(ircsession, dcc->id, err, dcc->ctx, dcc->incoming_buf, strlen(dcc->incoming_buf));
libirc_mutex_lock (&ircsession->mutex_dcc);
if ( dcc->incoming_offset - offset > 0 )
memmove (dcc->incoming_buf, dcc->incoming_buf + offset, dcc->incoming_offset - offset);
dcc->incoming_offset -= offset;
}
}
/*
* If error arises somewhere above, we inform the caller
* of failure, and destroy this session.
*/
if ( err )
{
libirc_mutex_unlock (&ircsession->mutex_dcc);
(*dcc->cb)(ircsession, dcc->id, err, dcc->ctx, 0, 0);
libirc_mutex_lock (&ircsession->mutex_dcc);
libirc_dcc_destroy_nolock (ircsession, dcc->id);
}
}
