/**
* \brief This function handles node commands, when payload packet was received.
*
* This function also detects packet loss of previous not received payload
* packets. All node commands are unpacked from the buffer and added to incoming queue.
*
* \param[in] *C The verse context.
*
* \return This function returns RECEIVE_PACKET_DELAYED, when delayd packet
* was received, otherwise it returns RECEIVE_PACKET_SUCCESS.
*/
static int handle_node_commands(struct vContext *C)
{
struct VSession *vsession = CTX_current_session(C);
struct VDgramConn *vconn = CTX_current_dgram_conn(C);
struct VPacket *r_packet = CTX_r_packet(C);
struct Ack_Nak_Cmd ack_nak_cmd;
/* Note: when ACK and NAK command are add to the AckNak history,
* then this vector of commands is automatically compressed. */
/* Was any packet lost since last receiving of packet? */
if(r_packet->header.payload_id > vconn->last_r_pay+1) {
v_print_log(VRS_PRINT_DEBUG_MSG, "Packet(s) lost: %d - %d\n",
vconn->last_r_pay+1, r_packet->header.payload_id-1);
/* Add NAK command to the list of ACK NAK commands */
ack_nak_cmd.id = CMD_NAK_ID;
ack_nak_cmd.pay_id = vconn->last_r_pay+1;
v_ack_nak_history_add_cmd(&vconn->ack_nak, &ack_nak_cmd);
/* Was some delayed packet received? */
} else if(r_packet->header.payload_id < vconn->last_r_pay+1) {
if(is_log_level(VRS_PRINT_WARNING))
v_print_log(VRS_PRINT_WARNING, "Received unordered packet: %d, expected: %d\n", r_packet->header.payload_id, vconn->last_r_pay+1);
/* Drop this packet */
return RECEIVE_PACKET_UNORDERED;
}
/* ADD ACK command to the list of ACK NAK commands */
ack_nak_cmd.id = CMD_ACK_ID;
ack_nak_cmd.pay_id = r_packet->header.payload_id;
v_ack_nak_history_add_cmd(&vconn->ack_nak, &ack_nak_cmd);
/* Check if there are really node commands */
if(r_packet->data!=NULL) {
/* Unpack node commands and put them to the queue of incoming commands */
v_cmd_unpack((char*)r_packet->data, r_packet->data_size, vsession->in_queue);
}
return RECEIVE_PACKET_SUCCESS;
}
/**
* \brief This function set size of receive window (flow control), which is sent
* to the peer.
*
* This function sets C->dgram_conn->rwin_host
*
* \param[in] *C Verse context
*
*/
static void set_host_rwin(struct vContext *C)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VSession *vsession = CTX_current_session(C);
long int free_space;
switch(dgram_conn->fc_meth) {
case FC_NONE:
dgram_conn->rwin_host = 0xFFFFFFFF;
break;
case FC_TCP_LIKE:
/* Compute free space in incomming queue */
free_space = (long int)vsession->in_queue->max_size - (long int)vsession->in_queue->size;
dgram_conn->rwin_host = (uint32)(free_space > 0) ? free_space : 0;
/*printf(">>> max_size: %d, size: %d -> free_size: %ld -> window %d<<<\n",
vsession->in_queue->max_size, vsession->in_queue->size, free_space, dgram_conn->rwin_host);*/
break;
case FC_RESERVED:
v_print_log(VRS_PRINT_WARNING, "FC_RESERVED should never be used\n");
dgram_conn->rwin_host = 0xFFFFFFFF;
break;
}
}
/**
* \brief This function is called, when server is in NEGOTIATE newhost state
*/
int vs_NEGOTIATE_newhost_loop(struct vContext *C)
{
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VSession *vsession = CTX_current_session(C);
struct VMessage *r_message = CTX_r_message(C);
int i, buffer_pos=0;
/* Reset content of received message */
memset(r_message, 0, sizeof(struct VMessage));
/* Unpack Verse message header */
buffer_pos += v_unpack_message_header(&io_ctx->buf[buffer_pos], (io_ctx->buf_size - buffer_pos), r_message);
/* Unpack all system commands */
buffer_pos += v_unpack_message_system_commands(&io_ctx->buf[buffer_pos], (io_ctx->buf_size - buffer_pos), r_message);
v_print_receive_message(C);
/* Process all system commands */
for(i=0; i<MAX_SYSTEM_COMMAND_COUNT && r_message->sys_cmd[i].cmd.id!=CMD_RESERVED_ID; i++) {
switch(r_message->sys_cmd[i].cmd.id) {
case CMD_CONFIRM_L_ID:
if(r_message->sys_cmd[i].negotiate_cmd.feature==FTR_HOST_URL) {
if(r_message->sys_cmd[i].negotiate_cmd.count == 1) {
if(vsession->host_url!=NULL &&
strcmp(vsession->host_url, (char*)r_message->sys_cmd[i].negotiate_cmd.value[0].string8.str) == 0) {
return 1;
}
}
}
break;
}
}
return 0;
}
static int vs_RESPOND_krb_auth_loop(struct vContext *C, const char *u_name) {
struct VS_CTX *vs_ctx = CTX_server_ctx(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VSession *vsession = CTX_current_session(C);
struct VMessage *r_message = CTX_r_message(C);
struct VMessage *s_message = CTX_s_message(C);
int i, cmd_rank = 0, client_name_proposed = 0, client_version_proposed = 0;
unsigned short buffer_pos = 0;
int user_id;
/* Reset content of received message */
memset(r_message, 0, sizeof(struct VMessage));
/* Unpack Verse message header */
buffer_pos += v_unpack_message_header(&io_ctx->buf[buffer_pos], (io_ctx->buf_size - buffer_pos), r_message);
/* Unpack all system commands */
buffer_pos += v_unpack_message_system_commands(&io_ctx->buf[buffer_pos], (io_ctx->buf_size - buffer_pos), r_message);
v_print_receive_message(C);
for(i=0; i<MAX_SYSTEM_COMMAND_COUNT && r_message->sys_cmd[i].cmd.id!=CMD_RESERVED_ID; i++) {
switch(r_message->sys_cmd[i].cmd.id) {
case CMD_CHANGE_L_ID:
/* Client could propose client name and version */
if(r_message->sys_cmd[i].negotiate_cmd.feature == FTR_CLIENT_NAME) {
if(r_message->sys_cmd[i].negotiate_cmd.count > 0) {
/* Only first proposed client name will be used */
vsession->client_name = strdup((char*)r_message->sys_cmd[i].negotiate_cmd.value[0].string8.str);
client_name_proposed = 1;
}
} else if(r_message->sys_cmd[i].negotiate_cmd.feature == FTR_CLIENT_VERSION) {
if(r_message->sys_cmd[i].negotiate_cmd.count > 0) {
/* Only first proposed client name will be used */
vsession->client_version = strdup((char*)r_message->sys_cmd[i].negotiate_cmd.value[0].string8.str);
client_version_proposed = 1;
}
}
break;
default:
v_print_log(VRS_PRINT_WARNING,
"This command id: %d is not supported in this state\n",
r_message->sys_cmd[i].cmd.id);
break;
}
}
buffer_pos = VERSE_MESSAGE_HEADER_SIZE;
/* Send confirmation about client name */
if (client_name_proposed == 1) {
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CONFIRM_L_ID,
FTR_CLIENT_NAME, vsession->client_name, NULL);
}
/* Send confirmation about client version only in situation, when
* client proposed client name too */
if (client_version_proposed == 1) {
if (client_name_proposed == 1) {
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++,
CMD_CONFIRM_L_ID, FTR_CLIENT_VERSION,
vsession->client_version, NULL);
} else {
/* Client version without client name is not allowed */
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++,
CMD_CONFIRM_L_ID, FTR_CLIENT_VERSION,
NULL);
}
}
/* Do user authentication */
if ((user_id = vs_krb_make_user(C, u_name)) != -1) {
long int avatar_id;
pthread_mutex_lock(&vs_ctx->data.mutex);
avatar_id = vs_create_avatar_node(vs_ctx, vsession, user_id);
pthread_mutex_unlock(&vs_ctx->data.mutex);
if(avatar_id == -1) {
v_print_log(VRS_PRINT_ERROR, "Failed to create avatar node\n");
return 0;
}
/* Save user_id to the session and send it in
* connect_accept command */
vsession->user_id = user_id;
vsession->avatar_id = avatar_id;
s_message->sys_cmd[cmd_rank].ua_succ.id = CMD_USER_AUTH_SUCCESS;
s_message->sys_cmd[cmd_rank].ua_succ.user_id = user_id;
s_message->sys_cmd[cmd_rank].ua_succ.avatar_id = avatar_id;
cmd_rank++;
/* Generate random string for coockie */
vsession->peer_cookie.str = (char*)calloc((COOKIE_SIZE+1), sizeof(char));
for(i=0; i<COOKIE_SIZE; i++) {
/* Generate only printable characters (debug prints) */
vsession->peer_cookie.str[i] = 32 + (char)((float)rand()*94.0/RAND_MAX);
}
vsession->peer_cookie.str[COOKIE_SIZE] = '\0';
/* Set up negotiate command of the host cookie */
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CHANGE_R_ID, FTR_COOKIE,
vsession->peer_cookie.str, NULL);
/* Load DED from configuration and save it to the session */
vsession->ded.str = strdup(vs_ctx->ded);
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CHANGE_L_ID, FTR_DED,
vsession->ded.str, NULL);
buffer_pos += v_pack_stream_system_commands(s_message, &io_ctx->buf[buffer_pos]);
s_message->header.len = io_ctx->buf_size = buffer_pos;
s_message->header.version = VRS_VERSION;
/* Pack header to the beginning of the buffer */
v_pack_message_header(s_message, io_ctx->buf);
v_print_send_message(C);
return 1;
} else {
s_message->sys_cmd[0].ua_fail.id = CMD_USER_AUTH_FAILURE;
s_message->sys_cmd[0].ua_fail.count = 0;
s_message->sys_cmd[1].cmd.id = CMD_RESERVED_ID;
buffer_pos += v_pack_stream_system_commands(s_message,
&io_ctx->buf[buffer_pos]);
s_message->header.len = io_ctx->buf_size = buffer_pos;
s_message->header.version = VRS_VERSION;
/* Pack header to the beginning of the buffer */
v_pack_message_header(s_message, io_ctx->buf);
v_print_send_message(C);
return 1;
}
return 0;
}
/**
* \brief This function process received message and send respond to the client
* if client sent CMD_USER_AUTH_REQUEST with method type UA_METHOD_NONE. The
* response contains list of supported authentication methods (only Password
* method is supported now)
* \param[in] *C The pointer at Verse context
* \return The function returns 1, when response was sent to the client
* and it returns 0, when all needs were not meet or error occurred.
*/
int vs_RESPOND_methods_loop(struct vContext *C)
{
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VSession *vsession = CTX_current_session(C);
struct VMessage *r_message = CTX_r_message(C);
struct VMessage *s_message = CTX_s_message(C);
int i, auth_req = 0,
client_name_proposed = 0,
client_version_proposed = 0;
unsigned short buffer_pos = 0;
/* Reset content of received message */
memset(r_message, 0, sizeof(struct VMessage));
/* Unpack Verse message header */
buffer_pos += v_unpack_message_header(&io_ctx->buf[buffer_pos], (io_ctx->buf_size - buffer_pos), r_message);
/* Unpack all system commands */
buffer_pos += v_unpack_message_system_commands(&io_ctx->buf[buffer_pos], (io_ctx->buf_size - buffer_pos), r_message);
v_print_receive_message(C);
for(i=0; i<MAX_SYSTEM_COMMAND_COUNT && r_message->sys_cmd[i].cmd.id!=CMD_RESERVED_ID; i++) {
switch(r_message->sys_cmd[i].cmd.id) {
case CMD_USER_AUTH_REQUEST:
if(r_message->sys_cmd[i].ua_req.method_type == VRS_UA_METHOD_NONE) {
auth_req = 1;
} else {
v_print_log(VRS_PRINT_WARNING,
"This auth method id: %d is not supported in this state\n",
r_message->sys_cmd[i].ua_req.method_type);
}
break;
case CMD_CHANGE_L_ID:
/* Client could propose client name and version */
if(r_message->sys_cmd[i].negotiate_cmd.feature == FTR_CLIENT_NAME) {
if(r_message->sys_cmd[i].negotiate_cmd.count > 0) {
/* Only first proposed client name will be used */
vsession->client_name = strdup((char*)r_message->sys_cmd[i].negotiate_cmd.value[0].string8.str);
client_name_proposed = 1;
}
} else if(r_message->sys_cmd[i].negotiate_cmd.feature == FTR_CLIENT_VERSION) {
if(r_message->sys_cmd[i].negotiate_cmd.count > 0) {
/* Only first proposed client name will be used */
vsession->client_version = strdup((char*)r_message->sys_cmd[i].negotiate_cmd.value[0].string8.str);
client_version_proposed = 1;
}
}
break;
default:
v_print_log(VRS_PRINT_WARNING,
"This command id: %d is not supported in this state\n",
r_message->sys_cmd[i].cmd.id);
break;
}
}
if(auth_req == 1) {
int cmd_rank = 0;
/* VRS_UA_METHOD_NONE is not supported method. Send list of
* supported methods. Current implementation supports
* only PASSWORD method now. */
s_message->sys_cmd[cmd_rank].ua_fail.id = CMD_USER_AUTH_FAILURE;
/* List of supported methods */
s_message->sys_cmd[cmd_rank].ua_fail.count = 1;
s_message->sys_cmd[cmd_rank].ua_fail.method[0] = VRS_UA_METHOD_PASSWORD;
cmd_rank++;
/* Send confirmation about client name */
if(client_name_proposed == 1) {
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CONFIRM_L_ID, FTR_CLIENT_NAME,
vsession->client_name, NULL);
}
/* Send confirmation about client version only in situation, when
* client proposed client name too */
if(client_version_proposed == 1) {
if(client_name_proposed == 1) {
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CONFIRM_L_ID, FTR_CLIENT_VERSION,
vsession->client_version, NULL);
} else {
/* Client version without client name is not allowed */
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CONFIRM_L_ID, FTR_CLIENT_VERSION,
NULL);
}
}
buffer_pos = VERSE_MESSAGE_HEADER_SIZE;
/* Pack system commands to the buffer */
buffer_pos += v_pack_stream_system_commands(s_message,&io_ctx->buf[buffer_pos]);
s_message->header.len = io_ctx->buf_size = buffer_pos;
s_message->header.version = VRS_VERSION;
/* Pack header to the beginning of the buffer */
v_pack_message_header(s_message, io_ctx->buf);
/* Debug print of command to be send */
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
v_print_send_message(C);
}
return 1;
}
return 0;
}
int vs_RESPOND_userauth_loop(struct vContext *C)
{
struct VS_CTX *vs_ctx = CTX_server_ctx(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VSession *vsession = CTX_current_session(C);
struct VMessage *r_message = CTX_r_message(C);
struct VMessage *s_message = CTX_s_message(C);
int i, cmd_rank = 0;
unsigned short buffer_pos = 0;
/* Reset content of received message */
memset(r_message, 0, sizeof(struct VMessage));
/* Unpack Verse message header */
buffer_pos += v_unpack_message_header(&io_ctx->buf[buffer_pos], (io_ctx->buf_size - buffer_pos), r_message);
/* Unpack all system commands */
buffer_pos += v_unpack_message_system_commands(&io_ctx->buf[buffer_pos], (io_ctx->buf_size - buffer_pos), r_message);
v_print_receive_message(C);
for(i=0; i<MAX_SYSTEM_COMMAND_COUNT && r_message->sys_cmd[i].cmd.id!=CMD_RESERVED_ID; i++) {
if(r_message->sys_cmd[i].cmd.id == CMD_USER_AUTH_REQUEST) {
if(r_message->sys_cmd[i].ua_req.method_type == VRS_UA_METHOD_PASSWORD) {
int user_id;
/* Do user authentication */
if((user_id = vs_user_auth(C,
r_message->sys_cmd[i].ua_req.username,
r_message->sys_cmd[i].ua_req.data)) != -1)
{
long int avatar_id;
pthread_mutex_lock(&vs_ctx->data.mutex);
avatar_id = vs_create_avatar_node(vs_ctx, vsession, user_id);
pthread_mutex_unlock(&vs_ctx->data.mutex);
if(avatar_id == -1) {
v_print_log(VRS_PRINT_ERROR, "Failed to create avatar node\n");
return 0;
}
buffer_pos = VERSE_MESSAGE_HEADER_SIZE;
/* Save user_id to the session and send it in
* connect_accept command */
vsession->user_id = user_id;
vsession->avatar_id = avatar_id;
s_message->sys_cmd[cmd_rank].ua_succ.id = CMD_USER_AUTH_SUCCESS;
s_message->sys_cmd[cmd_rank].ua_succ.user_id = user_id;
s_message->sys_cmd[cmd_rank].ua_succ.avatar_id = avatar_id;
cmd_rank++;
/* Generate random string for coockie */
vsession->peer_cookie.str = (char*)calloc((COOKIE_SIZE+1), sizeof(char));
for(i=0; i<COOKIE_SIZE; i++) {
/* Generate only printable characters (debug prints) */
vsession->peer_cookie.str[i] = 32 + (char)((float)rand()*94.0/RAND_MAX);
}
vsession->peer_cookie.str[COOKIE_SIZE] = '\0';
/* Set up negotiate command of the host cookie */
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CHANGE_R_ID, FTR_COOKIE,
vsession->peer_cookie.str, NULL);
/* Load DED from configuration and save it to the session */
vsession->ded.str = strdup(vs_ctx->ded);
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CHANGE_L_ID, FTR_DED,
vsession->ded.str, NULL);
buffer_pos += v_pack_stream_system_commands(s_message, &io_ctx->buf[buffer_pos]);
s_message->header.len = io_ctx->buf_size = buffer_pos;
s_message->header.version = VRS_VERSION;
/* Pack header to the beginning of the buffer */
v_pack_message_header(s_message, io_ctx->buf);
v_print_send_message(C);
return 1;
} else {
buffer_pos = VERSE_MESSAGE_HEADER_SIZE;
s_message->sys_cmd[0].ua_fail.id = CMD_USER_AUTH_FAILURE;
s_message->sys_cmd[0].ua_fail.count = 0;
s_message->sys_cmd[1].cmd.id = CMD_RESERVED_ID;
buffer_pos += v_pack_stream_system_commands(s_message, &io_ctx->buf[buffer_pos]);
s_message->header.len = io_ctx->buf_size = buffer_pos;
s_message->header.version = VRS_VERSION;
/* Pack header to the beginning of the buffer */
v_pack_message_header(s_message, io_ctx->buf);
v_print_send_message(C);
return 1;
}
}
}
}
return 0;
}
/**
* \brief WebSocket callback function for received message
*/
void vs_ws_recv_msg_callback(wslay_event_context_ptr wslay_ctx,
const struct wslay_event_on_msg_recv_arg *arg,
void *user_data)
{
struct vContext *C = (struct vContext*)user_data;
struct VS_CTX *vs_ctx = CTX_server_ctx(C);
struct VSession *session = CTX_current_session(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
int ret;
if(!wslay_is_ctrl_frame(arg->opcode)) {
/* Verse server uses only binary message for communication */
if(arg->opcode == WSLAY_BINARY_FRAME) {
struct wslay_event_msg msgarg;
#if DEBUG_WEB_SOCKET
unsigned int i;
v_print_log(VRS_PRINT_DEBUG_MSG,
"WS Callback received binary message\n");
v_print_log(VRS_PRINT_DEBUG_MSG,
"Binary dump\n");
/* Print dump of received data */
for(i=0; i<arg->msg_length; i++) {
v_print_log_simple(VRS_PRINT_DEBUG_MSG, "%d,", arg->msg[i]);
}
v_print_log_simple(VRS_PRINT_DEBUG_MSG, "\n");
#endif
/* Copy received data to IO context */
memcpy(io_ctx->buf, arg->msg, arg->msg_length);
io_ctx->buf_size = arg->msg_length;
if(session->stream_conn->host_state == TCP_SERVER_STATE_STREAM_OPEN) {
if(v_STREAM_handle_messages(C) != 0) {
/* When some payload data were received, then poke data thread */
sem_post(vs_ctx->data.sem);
} else {
/* End connection */
session->stream_conn->host_state = TCP_SERVER_STATE_CLOSING;
/* Try to close connection with WebSocket client */
wslay_event_queue_close(wslay_ctx,
WSLAY_CODE_PROTOCOL_ERROR,
(uint8_t*)"Wrong command", /* Close message */
13); /* The length of close message */
return;
}
} else {
if( vs_handle_handshake(C) == -1 ) {
/* End connection */
session->stream_conn->host_state = TCP_SERVER_STATE_CLOSING;
/* Try to close connection with WebSocket client */
wslay_event_queue_close(wslay_ctx,
WSLAY_CODE_PROTOCOL_ERROR,
(uint8_t*)"Wrong command", /* Close message */
13); /* The length of close message */
return;
}
/* During handshake send response immediately. */
/* TODO: optionally send message fragmented, when it is needed using:
* wslay_event_queue_fragmented_msg() */
msgarg.opcode = WSLAY_BINARY_FRAME;
msgarg.msg = (uint8_t*)io_ctx->buf;
msgarg.msg_length = io_ctx->buf_size;
/* Queue message for sending */
if((ret = wslay_event_queue_msg(wslay_ctx, &msgarg)) != 0) {
v_print_log(VRS_PRINT_ERROR,
"Unable to queue message to WebSocket: %d\n", ret);
return;
} else {
v_print_log(VRS_PRINT_DEBUG_MSG,
"WebSocket message successfully queued\n");
}
}
} else if(arg->opcode == WSLAY_TEXT_FRAME) {
v_print_log(VRS_PRINT_ERROR, "WebSocket text frame is not supported\n");
return;
}
} else {
/* Print opcode of control message */
v_print_log(VRS_PRINT_DEBUG_MSG,
"WS Callback Received Ctrl Message: opcode: %d\n",
arg->opcode);
/* Is it closing message? */
if(arg->opcode & WSLAY_CONNECTION_CLOSE) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"Close message with code: %d, message: %s\n",
arg->status_code,
arg->msg);
/* When this control message was received at second time, then
* switch to the state CLOSED. Otherwise switch to the state
* CLOSING */
if(session->stream_conn->host_state == TCP_SERVER_STATE_CLOSING) {
session->stream_conn->host_state = TCP_SERVER_STATE_CLOSED;
} else {
session->stream_conn->host_state = TCP_SERVER_STATE_CLOSING;
/* When server wasn't in the state closing, then send
* confirmation to the client, that this connection will be
* closed */
wslay_event_queue_close(wslay_ctx,
WSLAY_CODE_NORMAL_CLOSURE,
(uint8_t*)"Closing connection",
15);
}
}
}
}
/**
* \brief This function is the callback function for received Change_L
* commands in REQUEST state.
*/
static int vc_REQUEST_CHANGE_L_cb(struct vContext *C, struct Generic_Cmd *cmd)
{
struct VSession *vsession = CTX_current_session(C);
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct Negotiate_Cmd *change_l_cmd = (struct Negotiate_Cmd*)cmd;
int value_rank;
if(change_l_cmd->feature == FTR_TOKEN) {
/* This block of code checks, if received token is the same as the
* negotiated token. When token is not the same, then the client
* will not response to the received packet. */
if( vsession->peer_token.str != NULL &&
change_l_cmd->count > 0)
{
v_print_log(VRS_PRINT_DEBUG_MSG,
"Remote TOKEN: %s proposed\n",
change_l_cmd->value[0].string8.str);
return 1;
} else {
v_print_log(VRS_PRINT_WARNING, "Peer proposed wrong TOKEN\n");
return 0;
}
}
/* Server proposes it's own Flow Control */
if(change_l_cmd->feature == FTR_FC_ID) {
int ret = 0;
for(value_rank=0; value_rank<change_l_cmd->count; value_rank++) {
/* Is value in "list" of supported methods */
if(change_l_cmd->value[value_rank].uint8 == FC_NONE ||
change_l_cmd->value[value_rank].uint8 == FC_TCP_LIKE)
{
/* It will try to use first found supported method, but ... */
if(dgram_conn->fc_meth == FC_RESERVED) {
/* Flow Control has not been proposed yet */
} else {
/* Server has to propose same FC methods for client
* and server. Client can't use different method then
* server and vice versa. */
if(dgram_conn->fc_meth != change_l_cmd->value[value_rank].uint8) {
v_print_log(VRS_PRINT_WARNING,
"Skipping proposed local FC :%d; it is not teh same as proposed remote FC: %d\n",
change_l_cmd->value[value_rank].uint8,
dgram_conn->fc_meth);
continue;
}
}
dgram_conn->fc_meth = change_l_cmd->value[value_rank].uint8;
v_print_log(VRS_PRINT_DEBUG_MSG,
"Local Flow Control ID: %d proposed\n",
change_l_cmd->value[0].uint8);
ret = 1;
break;
} else {
v_print_log(VRS_PRINT_ERROR,
"Skipping unsupported Flow Control method: %d\n",
change_l_cmd->value[value_rank].uint8);
continue;
}
}
return ret;
}
/* Server proposes it's own scale of Flow Control Window */
if(change_l_cmd->feature == FTR_RWIN_SCALE) {
if(change_l_cmd->count >= 1) {
dgram_conn->rwin_peer_scale = change_l_cmd->value[0].uint8;
v_print_log(VRS_PRINT_DEBUG_MSG,
"Scale of peer RWIN: %d proposed\n",
dgram_conn->rwin_peer_scale);
return 1;
} else {
v_print_log(VRS_PRINT_ERROR,
"At last on value of RWIN scale has to be proposed\n");
return 0;
}
}
/* Ignore unknown feature */
return 1;
}
void* vc_main_dgram_loop(void *arg)
{
struct vContext *C = (struct vContext*)arg;
struct VSession *vsession = CTX_current_session(C);
struct VDgramConn *dgram_conn = vsession->dgram_conn;
struct VStreamConn *stream_conn = CTX_current_stream_conn(C);
struct VPacket *r_packet, *s_packet;
char error = 0;
const uint8 *ret_val = 0;
if(dgram_conn==NULL) {
/* Create new datagrame connection */
if((dgram_conn = vc_create_client_dgram_conn(C))==NULL) {
goto finish;
}
vsession->dgram_conn = dgram_conn;
}
CTX_current_dgram_conn_set(C, dgram_conn);
CTX_io_ctx_set(C, &dgram_conn->io_ctx);
#if (defined WITH_OPENSSL) && OPENSSL_VERSION_NUMBER>=0x10000000
/* If negotiated security is DTLS, then try to do DTLS handshake */
if(dgram_conn->io_ctx.flags & SOCKET_SECURED) {
if(vc_create_dtls_connection(C) == 0) {
CTX_current_dgram_conn_set(C, NULL);
CTX_io_ctx_set(C, NULL);
free(dgram_conn);
ret_val = &vrs_conn_term_error;
goto finish;
}
}
#endif
/* Packet structure for receiving */
r_packet = (struct VPacket*)malloc(sizeof(struct VPacket));
CTX_r_packet_set(C, r_packet);
/* Packet structure for sending */
s_packet = (struct VPacket*)malloc(sizeof(struct VPacket));
CTX_s_packet_set(C, s_packet);
/* Run loop of the first phase of the handshake */
if((error = vc_REQUEST_loop(C)) == STATE_EXIT_ERROR) {
/* Do not confirm proposed URL, when client was not able to connect
* to the server */
CTX_io_ctx_set(C, &stream_conn->io_ctx);
vc_NEGOTIATE_newhost(C, NULL);
CTX_io_ctx_set(C, &dgram_conn->io_ctx);
ret_val = &vrs_conn_term_error;
goto end;
}
/* When server responded in the first phase of the handshake, then run loop of the second
* phase of the handshake */
if((error = vc_PARTOPEN_loop(C)) == STATE_EXIT_ERROR) {
/* Do not confirm proposed URL, when client was not able to connect
* to the server */
CTX_io_ctx_set(C, &stream_conn->io_ctx);
vc_NEGOTIATE_newhost(C, NULL);
CTX_io_ctx_set(C, &dgram_conn->io_ctx);
ret_val = &vrs_conn_term_error;
goto end;
} else {
struct Connect_Accept_Cmd *conn_accept;
/* Put connect accept command to queue -> call callback function */
conn_accept = v_Connect_Accept_create(vsession->avatar_id, vsession->user_id);
v_in_queue_push(vsession->in_queue, (struct Generic_Cmd*)conn_accept);
/* Send confirmation of the URL to the server */
CTX_io_ctx_set(C, &stream_conn->io_ctx);
vc_NEGOTIATE_newhost(C, vsession->host_url);
CTX_io_ctx_set(C, &dgram_conn->io_ctx);
/* TCP connection could be closed now */
vsession->stream_conn->host_state = TCP_CLIENT_STATE_CLOSING;
}
/* Main loop for data exchange */
if((error = vc_OPEN_loop(C)) == STATE_EXIT_ERROR) {
ret_val = &vrs_conn_term_error;
goto end;
}
/* Closing loop */
if((error = vc_CLOSING_loop(C)) == STATE_EXIT_ERROR) {
ret_val = &vrs_conn_term_error;
goto end;
}
/* TODO: distinguish between terminating connection by server and client */
ret_val = &vrs_conn_term_server;
end:
/* CLOSED state */
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Client state: CLOSED\n");
printf("%c[%dm", 27, 0);
}
free(r_packet);
free(s_packet);
#if (defined WITH_OPENSSL) && OPENSSL_VERSION_NUMBER>=0x10000000
if(dgram_conn->io_ctx.flags & SOCKET_SECURED) {
vc_destroy_dtls_connection(C);
}
#endif
v_conn_dgram_destroy(dgram_conn);
CTX_current_dgram_conn_set(C, NULL);
finish:
pthread_exit((void*)ret_val);
return NULL;
}
int vc_create_dtls_connection(struct vContext *C)
{
struct VC_CTX *vc_ctx = CTX_client_ctx(C);
struct VSession *vsession = CTX_current_session(C);
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct timeval timeout;
int ret = 0;
v_print_log(VRS_PRINT_DEBUG_MSG, "Try to do DTLS handshake at UDP socket: %d\n",
dgram_conn->io_ctx.sockfd);
/* Create ssl for new connection */
if( (dgram_conn->io_ctx.ssl = SSL_new(vc_ctx->dtls_ctx)) == NULL) {
v_print_log(VRS_PRINT_ERROR, "SSL_new(%p)\n", (void*)vc_ctx->dtls_ctx);
return 0;
}
/* Set state of bio as connected */
if(dgram_conn->io_ctx.peer_addr.ip_ver == IPV4) {
ret = BIO_ctrl(dgram_conn->io_ctx.bio, BIO_CTRL_DGRAM_SET_CONNECTED, 0, &dgram_conn->io_ctx.peer_addr.addr.ipv6);
} else if(dgram_conn->io_ctx.peer_addr.ip_ver == IPV6) {
ret = BIO_ctrl(dgram_conn->io_ctx.bio, BIO_CTRL_DGRAM_SET_CONNECTED, 0, &dgram_conn->io_ctx.peer_addr.addr.ipv4);
}
/* When BIO_ctrl was called with bad arguments, then it returns 0 */
if(ret==0) {
v_print_log(VRS_PRINT_ERROR, "BIO_ctrl()\n");
SSL_free(dgram_conn->io_ctx.ssl);
return 0;
}
/* Set and activate timeouts */
timeout.tv_sec = 1;
timeout.tv_usec = 0;
BIO_ctrl(dgram_conn->io_ctx.bio, BIO_CTRL_DGRAM_SET_RECV_TIMEOUT, 0, &timeout);
BIO_ctrl(dgram_conn->io_ctx.bio, BIO_CTRL_DGRAM_SET_SEND_TIMEOUT, 0, &timeout);
/* Bind ssl and bio */
SSL_set_bio(dgram_conn->io_ctx.ssl, dgram_conn->io_ctx.bio, dgram_conn->io_ctx.bio);
/* Try to do DTLS handshake */
again:
if ((ret = SSL_connect(dgram_conn->io_ctx.ssl)) <= 0) {
int err = SSL_get_error(dgram_conn->io_ctx.ssl, ret);
if(err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) {
gettimeofday(&timeout, NULL);
if((timeout.tv_sec - vsession->peer_token.tv.tv_sec) > VRS_TIMEOUT) {
v_print_log(VRS_PRINT_ERROR, "Token timed out\n");
return 0;
}
usleep(1000);
goto again;
}
ERR_print_errors_fp(stderr);
v_print_log(VRS_PRINT_ERROR, "SSL_connect() failed: %d -> %d\n", ret, err);
SSL_free(dgram_conn->io_ctx.ssl);
dgram_conn->io_ctx.ssl = NULL;
dgram_conn->io_ctx.bio = NULL;
return 0;
} else {
v_print_log(VRS_PRINT_DEBUG_MSG, "DTLS handshake finished\n");
v_print_log(VRS_PRINT_DEBUG_MSG, "Current cipher: %s\n",
SSL_CIPHER_get_name(SSL_get_current_cipher(dgram_conn->io_ctx.ssl)));
}
return 1;
}
/**
* \brief This command handle received packets in OPEN state at client and
* server in the same way.
*/
int handle_packet_in_OPEN_state(struct vContext *C)
{
struct VDgramConn *vconn = CTX_current_dgram_conn(C);
struct VSession *vsession = CTX_current_session(C);
struct VPacket *r_packet = CTX_r_packet(C);
int ret, first_sys_index, i;
/* Does packet contains node commands? */
if(r_packet->header.flags & PAY_FLAG) {
ret = handle_node_commands(C);
if(ret == RECEIVE_PACKET_UNORDERED)
return ret;
r_packet->acked=0;
}
/* Compute real RWIN of Flow Control */
vconn->rwin_peer = r_packet->header.window << vconn->rwin_peer_scale;
/* Was packet received with any ACK or NAK command? */
if(r_packet->header.flags & ACK_FLAG) {
ret = handle_ack_nak_commands(C);
}
/* Handle other system commands */
if(ret>=0) {
first_sys_index = ret;
} else {
first_sys_index = 0;
}
for(i=first_sys_index;
i<MAX_SYSTEM_COMMAND_COUNT && r_packet->sys_cmd[i].cmd.id != CMD_RESERVED_ID;
i++)
{
if(r_packet->sys_cmd[i].cmd.id == CMD_CHANGE_L_ID &&
r_packet->sys_cmd[i].negotiate_cmd.feature == FTR_FPS &&
r_packet->sys_cmd[i].negotiate_cmd.count > 0)
{
vsession->fps_host = vsession->fps_peer = r_packet->sys_cmd[i].negotiate_cmd.value->real32;
vsession->tmp_flags |= SYS_CMD_NEGOTIATE_FPS;
}
if(r_packet->sys_cmd[i].cmd.id == CMD_CONFIRM_L_ID &&
r_packet->sys_cmd[i].negotiate_cmd.feature == FTR_FPS &&
r_packet->sys_cmd[i].negotiate_cmd.count > 0)
{
vsession->fps_peer = r_packet->sys_cmd[i].negotiate_cmd.value->real32;
}
}
/* Was packet received with valid ANK ID? */
if(r_packet->header.flags & ANK_FLAG) {
/* Remove appropriate ACK and NAK commands form the history of ACK
* and NAK commands */
v_ack_nak_history_remove_cmds(&vconn->ack_nak, r_packet->header.ank_id);
}
/* Does peer want to finish this connection? */
if(r_packet->header.flags & FIN_FLAG) {
/* Change host state. Main connection loop will do the rest. */
vconn->host_state = UDP_CLIENT_STATE_CLOSING;
}
return RECEIVE_PACKET_SUCCESS;
}
/**
* \brief This function is called, when acknowledgment packet was received.
*
* This function processes all ACK and NAK commands and it add not obsolete
* commands from the history of sent packets to the out queue again. This
* function also removes positively and negatively acknowledged packets from
* history of sent packets. ANK ID is updated.
*
* \param[in] *C The verse context.
*
* \return This function returns index of last ACK command in sequence of
* system command, when ACK and NAK commands are the beginning of system
* commands, otherwise it returns -2. When no ACK or NAK command was found,
* then -1 is returned;
*/
static int handle_ack_nak_commands(struct vContext *C)
{
struct VSession *vsession = CTX_current_session(C);
struct VDgramConn *vconn = CTX_current_dgram_conn(C);
struct VPacket *r_packet = CTX_r_packet(C);
struct VSent_Packet *sent_packet;
struct VSent_Command *sent_cmd, *sent_cmd_prev;
unsigned long int rtt = ULONG_MAX;
struct timeval tv;
uint32 ack_id, nak_id;
int i, ret=-1;
gettimeofday(&tv, NULL);
/* Compute SRTT */
if(r_packet->sys_cmd[0].cmd.id==CMD_ACK_ID) {
unsigned long int tmp;
int i=0;
/* Try to find the smallest RTT from acknowledged packets */
for(i=0; r_packet->sys_cmd[i].cmd.id!=CMD_RESERVED_ID; i++) {
if(r_packet->sys_cmd[i].cmd.id==CMD_ACK_ID) {
sent_packet = v_packet_history_find_packet(&vconn->packet_history,
r_packet->sys_cmd[i].ack_cmd.pay_id);
if(sent_packet!=NULL) {
tmp = packet_rtt(sent_packet, &tv);
if(tmp<rtt) rtt=tmp;
}
}
}
if(rtt<ULONG_MAX) {
/* Computation of SRTT as described in RFC */
if(vconn->srtt==0) {
vconn->srtt = rtt;
} else {
vconn->srtt = RTT_ALPHA*vconn->srtt + (1-RTT_ALPHA)*rtt;
}
v_print_log(VRS_PRINT_DEBUG_MSG, "RTT: %d [us]\n", rtt);
v_print_log(VRS_PRINT_DEBUG_MSG, "SRTT: %d [us]\n", vconn->srtt);
}
}
/* Process all ACK and NAK commands. ACK and NAK commands should be first
* and there should not be other system commands between ACK and NAK
* commands. */
for(i=0;
r_packet->sys_cmd[i].cmd.id == CMD_NAK_ID ||
r_packet->sys_cmd[i].cmd.id == CMD_ACK_ID;
i++) {
if(r_packet->sys_cmd[i].cmd.id == CMD_ACK_ID) {
/* Check if ACK and NAK commands are the first system commands */
if(ret!=-2 && ret==i-1) {
ret = i;
} else {
ret = -2;
}
/* If this is not the last ACK command in the sequence of
* ACK/NAK commands, then remove all packets from history of
* sent packet, that are in following sub-sequence of ACK
* commands */
if(r_packet->sys_cmd[i+1].cmd.id == CMD_NAK_ID ||
r_packet->sys_cmd[i+1].cmd.id == CMD_ACK_ID)
{
/* Remove all acknowledged payload packets from the history
* of sent payload packets */
for(ack_id = r_packet->sys_cmd[i].ack_cmd.pay_id;
ack_id < r_packet->sys_cmd[i+1].nak_cmd.pay_id;
ack_id++)
{
v_packet_history_rem_packet(C, ack_id);
}
} else {
/* Remove this acknowledged payload packets from the history
* of sent payload packets */
v_packet_history_rem_packet(C, r_packet->sys_cmd[i].ack_cmd.pay_id);
/* This is the last ACK command in the sequence of ACK/NAK
* commands. Update ANK ID. */
vconn->ank_id = r_packet->sys_cmd[i].ack_cmd.pay_id;
}
} else if(r_packet->sys_cmd[i].cmd.id == CMD_NAK_ID) {
/* Check if ACK and NAK commands are the first system commands */
if(ret!=-2 && ret==i-1) {
ret = i;
} else {
ret = -2;
}
/* Go through the sub-sequence of NAk commands and try to re-send
* not-obsolete data from these packets */
for(nak_id = r_packet->sys_cmd[i].nak_cmd.pay_id;
nak_id < r_packet->sys_cmd[i+1].ack_cmd.pay_id;
nak_id++)
{
/* Add not obsolete data of lost packet to the outgoing queue */
/* Update ANK ID */
sent_packet = v_packet_history_find_packet(&vconn->packet_history, nak_id);
if(sent_packet != NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "Try to re-send packet: %d\n", nak_id);
sent_cmd = sent_packet->cmds.last;
/* Go through all commands in command list and add not
* obsolete commands to the outgoing queue */
while(sent_cmd != NULL) {
sent_cmd_prev = sent_cmd->prev;
if(sent_cmd->vbucket != NULL && sent_cmd->vbucket->data != NULL) {
/* Try to add command back to the outgoing command queue */
if(v_out_queue_push_head(vsession->out_queue,
sent_cmd->prio,
(struct Generic_Cmd*)sent_cmd->vbucket->data) == 1)
{
/* Remove bucket from the history of sent commands too */
v_hash_array_remove_item(&vconn->packet_history.cmd_hist[sent_cmd->id]->cmds, sent_cmd->vbucket->data);
/* When command was added back to the queue,
* then delete only sent command */
v_list_free_item(&sent_packet->cmds, sent_cmd);
}
}
sent_cmd = sent_cmd_prev;
}
/* When all not obsolete commands are added to outgoing
* queue, then this packet could be removed from packet
* history*/
v_packet_history_rem_packet(C, nak_id);
}
}
}
}
return ret;
}
/**
* \brief This function send packets in OPEN and CLOSEREQ state.
*/
int send_packet_in_OPEN_CLOSEREQ_state(struct vContext *C)
{
struct VDgramConn *vconn = CTX_current_dgram_conn(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VSession *vsession = CTX_current_session(C);
struct VPacket *s_packet = CTX_s_packet(C);
struct VSent_Packet *sent_packet = NULL;
unsigned short buffer_pos = 0;
struct timeval tv;
int ret, keep_alive_packet = -1, full_packet = 0;
int error_num;
uint16 swin, prio_win, sent_size = 0;
uint32 rwin;
int cmd_rank = 0;
/* Verse packet header */
s_packet->header.version = 1;
/* Clear header flags */
s_packet->header.flags = 0;
/* Check if it is necessary to send payload packet */
ret = check_pay_flag(C);
if(ret!=0) {
s_packet->header.flags |= PAY_FLAG;
if(ret==2) {
keep_alive_packet = 1;
}
}
/* When server is in CLOSEREQ state, then FIN flag should be set up */
if(vconn->host_state == UDP_SERVER_STATE_CLOSEREQ) {
s_packet->header.flags |= FIN_FLAG;
}
/* Check if it is necessary to send acknowledgment of received payload
* packet */
ret = check_ack_nak_flag(C);
if(ret==1) {
s_packet->header.flags |= ACK_FLAG;
/* Update last acknowledged Payload packet */
vconn->last_acked_pay = vconn->last_r_pay;
/* Add ACK and NAK commands from the list of ACK and NAK commands to the
* packet (only max count of ACK and NAK commands could be added to
* the packet) */
for(cmd_rank = 0;
cmd_rank < vconn->ack_nak.count &&
cmd_rank < MAX_SYSTEM_COMMAND_COUNT;
cmd_rank++)
{
s_packet->sys_cmd[cmd_rank].ack_cmd.id = vconn->ack_nak.cmds[cmd_rank].id;
s_packet->sys_cmd[cmd_rank].ack_cmd.pay_id = vconn->ack_nak.cmds[cmd_rank].pay_id;
}
s_packet->sys_cmd[cmd_rank].cmd.id = CMD_RESERVED_ID;
}
/* If there is no need to send Payload or AckNak packet, then cancel
* sending of packet */
if(! ((s_packet->header.flags & PAY_FLAG) ||
(s_packet->header.flags & ACK_FLAG)) ) return SEND_PACKET_CANCELED;
s_packet->header.flags |= ANK_FLAG;
s_packet->header.ank_id = vconn->ank_id;
/* Compute current windows for flow control and congestion control */
set_host_rwin(C);
set_host_cwin(C);
/* Set window of flow control that will sent to receiver */
rwin = vconn->rwin_host >> vconn->rwin_host_scale;
s_packet->header.window = (unsigned short)(rwin > 0xFFFF) ? 0xFFFF : rwin;
/*printf("\t---real window: %d---\n", s_packet->header.window);*/
/* Compute how many data could be sent to not congest receiver */
rwin = vconn->rwin_peer - vconn->sent_size;
/* Select smallest window for sending (congestion control window or flow control window)*/
swin = (vconn->cwin < rwin) ? vconn->cwin : rwin;
/* Set up Payload ID, when there is need to send payload packet */
if(s_packet->header.flags & PAY_FLAG)
s_packet->header.payload_id = vconn->host_id + vconn->count_s_pay;
else
s_packet->header.payload_id = 0;
/* Set up AckNak ID, when there are some ACK or NAK command in the packet */
if(s_packet->header.flags & ACK_FLAG)
s_packet->header.ack_nak_id = vconn->count_s_ack;
else
s_packet->header.ack_nak_id = 0;
/* When negotiated and used FPS is different, then pack negotiate command
* for FPS */
if(vsession->fps_host != vsession->fps_peer) {
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_FPS, &vsession->fps_host, NULL);
} else {
if(vsession->tmp_flags & SYS_CMD_NEGOTIATE_FPS) {
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CONFIRM_L_ID, FTR_FPS, &vsession->fps_peer, NULL);
/* Send confirmation only once for received system command */
vsession->tmp_flags &= ~SYS_CMD_NEGOTIATE_FPS;
}
}
v_print_send_packet(C);
/* Fill buffer */
buffer_pos += v_pack_packet_header(s_packet, &io_ctx->buf[buffer_pos]);
buffer_pos += v_pack_dgram_system_commands(s_packet, &io_ctx->buf[buffer_pos]);
/* When this is not pure keep alive packet */
if(s_packet->header.flags & PAY_FLAG) {
sent_packet = v_packet_history_add_packet(&vconn->packet_history, s_packet->header.payload_id);
assert(sent_packet != NULL);
if(keep_alive_packet != 1) {
real32 prio_sum_high, prio_sum_low, r_prio;
uint32 prio_count;
int16 prio, max_prio, min_prio;
uint16 tot_cmd_size;
/* Print outgoing command with green color */
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 32);
}
max_prio = v_out_queue_get_max_prio(vsession->out_queue);
min_prio = v_out_queue_get_min_prio(vsession->out_queue);
prio_sum_high = v_out_queue_get_prio_sum_high(vsession->out_queue);
prio_sum_low = v_out_queue_get_prio_sum_low(vsession->out_queue);
v_print_log(VRS_PRINT_DEBUG_MSG, "Packing prio queues, cmd count: %d\n", v_out_queue_get_count(vsession->out_queue));
/* Go through all priorities and pick commands from priority queues */
for(prio = max_prio; prio >= min_prio; prio--)
{
/* TODO: Add better check here */
if(prio <= VRS_DEFAULT_PRIORITY && buffer_pos >= vconn->io_ctx.mtu) {
break;
}
prio_count = v_out_queue_get_count_prio(vsession->out_queue, prio);
if(prio_count > 0) {
r_prio = v_out_queue_get_prio(vsession->out_queue, prio);
/* Compute size of buffer that could be occupied by
* commands from this queue */
if(prio >= VRS_DEFAULT_PRIORITY) {
prio_win = ((swin - buffer_pos)*r_prio)/prio_sum_high;
} else {
prio_win = ((swin - buffer_pos)*r_prio)/prio_sum_low;
}
/* Debug print */
v_print_log(VRS_PRINT_DEBUG_MSG, "Queue: %d, count: %d, r_prio: %6.3f, prio_win: %d\n",
prio, prio_count, r_prio, prio_win);
/* Get total size of commands that were stored in queue (sent_size) */
tot_cmd_size = 0;
/* Pack commands from queues with high priority to the buffer */
buffer_pos = pack_prio_queue(C, sent_packet, buffer_pos, prio, prio_win, &tot_cmd_size);
sent_size += tot_cmd_size;
}
}
/* Use default color for output */
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%dm", 27, 0);
}
} else {
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 32);
v_print_log(VRS_PRINT_DEBUG_MSG, "Keep alive packet\n");
printf("%c[%dm", 27, 0);
}
}
}
/* Update sent_size */
vconn->sent_size += sent_size;
io_ctx->buf_size = buffer_pos;
/* Send buffer */
ret = v_send_packet(io_ctx, &error_num);
if(ret==SEND_PACKET_SUCCESS) {
gettimeofday(&tv, NULL);
/* Update time of sending last payload packet */
if(s_packet->header.flags & PAY_FLAG) {
vconn->tv_pay_send.tv_sec = tv.tv_sec;
vconn->tv_pay_send.tv_usec = tv.tv_usec;
/* Store time of sending packet in history of sent packets. It is
* used for computing RTT and SRTT */
if(sent_packet != NULL) {
sent_packet->tv.tv_sec = tv.tv_sec;
sent_packet->tv.tv_usec = tv.tv_usec;
}
}
/* Update time of sending last acknowledgment packet */
if(s_packet->header.flags & ACK_FLAG) {
vconn->tv_ack_send.tv_sec = tv.tv_sec;
vconn->tv_ack_send.tv_usec = tv.tv_usec;
}
/* Update counter of sent packets */
if(s_packet->header.flags & PAY_FLAG) vconn->count_s_pay++;
if(s_packet->header.flags & ACK_FLAG) vconn->count_s_ack++;
/* If the packet was sent full and there are some pending data to send
* then modify returned value*/
if(full_packet == 1) {
ret = SEND_PACKET_FULL;
}
} else {
/* When packet wasn't sent, then remove this packet from history */
if(sent_packet != NULL) {
v_packet_history_rem_packet(C, s_packet->header.payload_id);
}
}
/*v_print_packet_history(&vconn->packet_history);*/
return ret;
}
/**
* \brief This function packs and compress command to the packet from one
* priority queue.
*
* \param[in] *C The verse context
* \param[in] *sent_packet The pointer at structure with send packet
* \param[in] buffer_pos The curent size of buffer of sent packet
* \param[in] prio The priority of sub queue
* \param[in] prio_win The window size of current prio queue
* \param[out] tot_cmd_size The total size of commands that were poped from prio queue
*/
static int pack_prio_queue(struct vContext *C,
struct VSent_Packet *sent_packet,
int buffer_pos,
uint8 prio,
uint16 prio_win,
uint16 *tot_cmd_size)
{
struct VSession *vsession = CTX_current_session(C);
struct VDgramConn *vconn = CTX_current_dgram_conn(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct Generic_Cmd *cmd;
int ret, last_cmd_count = 0;
uint16 cmd_count, cmd_len, cmd_size, sum_len=0;
int8 cmd_share;
uint8 last_cmd_id = CMD_RESERVED_ID;
while( (v_out_queue_get_count_prio(vsession->out_queue, prio) > 0) &&
(sum_len < prio_win) &&
(buffer_pos < vconn->io_ctx.mtu))
{
cmd_count = 0;
cmd_share = 0;
/* Compute how many commands could be compressed to the packet
* and compute right length of compressed commands. */
cmd_len = ((prio_win - sum_len)<(vconn->io_ctx.mtu - buffer_pos)) ?
(prio_win - sum_len) :
(vconn->io_ctx.mtu - buffer_pos);
/* Remove command from queue */
cmd = v_out_queue_pop(vsession->out_queue, prio, &cmd_count, &cmd_share, &cmd_len);
/* When it is not possible to pop more commands from queue, then break
* while loop */
if(cmd == NULL) {
break;
}
/* Is this command fake command? */
if(cmd->id < MIN_CMD_ID) {
if(cmd->id == FAKE_CMD_CONNECT_TERMINATE) {
struct VS_CTX *vs_ctx = CTX_server_ctx(C);
if(vs_ctx != NULL) {
vconn->host_state = UDP_SERVER_STATE_CLOSEREQ;
} else {
vconn->host_state = UDP_CLIENT_STATE_CLOSING;
}
} else if(cmd->id == FAKE_CMD_FPS) {
struct Fps_Cmd *fps_cmd = (struct Fps_Cmd*)cmd;
/* Change value of FPS. It will be sent in negotiate command
* until it is confirmed be the peer (server) */
vsession->fps_host = fps_cmd->fps;
}
v_cmd_destroy(&cmd);
} else {
/* What was size of command in queue */
cmd_size = v_cmd_size(cmd);
if(!(buffer_pos < (vconn->io_ctx.mtu - cmd_size))) {
/* When there is not enough space for other command,
* then push command back to the beginning of queue. */
v_out_queue_push_head(vsession->out_queue, prio, cmd);
break;
} else {
/* Update total size of commands that were poped from queue */
*tot_cmd_size += cmd_size;
/* When compression is not allowed, then add this command as is */
if( vconn->host_cmd_cmpr == CMPR_NONE) {
cmd_count = 0;
cmd_len = cmd_size;
/* Debug print */
v_print_log(VRS_PRINT_DEBUG_MSG, "Cmd: %d, count: %d, length: %d\n",
cmd->id, cmd_count, cmd_len);
/* Add command to the buffer */
buffer_pos += v_cmd_pack(&io_ctx->buf[buffer_pos], cmd, cmd_len, 0);
} else {
/* When command compression is allowed and was ID of command changed? */
if( (cmd->id != last_cmd_id) || (last_cmd_count <= 0) ) {
/* When this command is alone, then use default command size */
if(cmd_count == 0) {
cmd_len = cmd_size;
} else {
/* FIXME: do not recompute command length here, but do it right,
* when command is added to the queue */
cmd_len = v_cmds_len(cmd, cmd_count, cmd_share, cmd_len);
}
/* Debug print */
v_print_log(VRS_PRINT_DEBUG_MSG, "Cmd: %d, count: %d, length: %d\n",
cmd->id, cmd_count, cmd_len);
/* Add command to the buffer */
buffer_pos += v_cmd_pack(&io_ctx->buf[buffer_pos], cmd, cmd_len, cmd_share);
/* Set up current count of commands in the line */
last_cmd_count = cmd_count;
/* Update summary of commands length */
sum_len += cmd_len;
} else {
buffer_pos += v_cmd_pack(&io_ctx->buf[buffer_pos], cmd, 0, cmd_share);
}
}
/* Print command */
v_cmd_print(VRS_PRINT_DEBUG_MSG, cmd);
/* TODO: remove command alias here (layer value set/unset) */
/* Add command to the packet history */
ret = v_packet_history_add_cmd(&vconn->packet_history, sent_packet, cmd, prio);
assert(ret==1);
/* Update last command id */
last_cmd_id = cmd->id;
/* Decrement counter of commands in queue */
last_cmd_count--;
}
}
}
return buffer_pos;
}
/**
* \brief This function removes packet with id from history of sent packets.
* It removes all its commands from the command history too.
*
* \param[in] *C The verse context.
* \param[in] id The ID of packet, the will be removed from the history.
*
* \return This function returns 1, then packet with id was found in the history
* and it returns 0 otherwise.
*/
int v_packet_history_rem_packet(struct vContext *C, uint32 id)
{
struct VS_CTX *vs_ctx = CTX_server_ctx(C);
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VPacket_History *history = &dgram_conn->packet_history;
struct VPacket *r_packet = CTX_r_packet(C);
struct VSent_Packet *sent_packet;
int ret = 0, is_fake_cmd_received = 0;
sent_packet = v_packet_history_find_packet(history, id);
if(sent_packet != NULL) {
struct VSent_Command *sent_cmd;
v_print_log(VRS_PRINT_DEBUG_MSG, "Removing packet: %d from history\n", sent_packet->id);
/* Go through the whole list of sent commands and free them from the
* hashed linked list */
sent_cmd = sent_packet->cmds.first;
while(sent_cmd != NULL) {
/* Remove own command from hashed linked list if it wasn't already
* removed, when command was obsoleted by some newer packet */
if(sent_cmd->vbucket!=NULL) {
struct Generic_Cmd *cmd = (struct Generic_Cmd*)sent_cmd->vbucket->data;
/* Bucket has to include some data */
assert(sent_cmd->vbucket->data!=NULL);
/* Decrease total size of commands that were sent and wasn't acknowladged yet*/
dgram_conn->sent_size -= v_cmd_size(cmd);
/* Put fake command for create/destroy commands at verse server */
if(vs_ctx != NULL) {
struct VSession *vsession = CTX_current_session(C);
struct Generic_Cmd *fake_cmd = NULL;
switch(cmd->id) {
case CMD_NODE_CREATE:
fake_cmd = v_fake_node_create_ack_create(UINT32(cmd->data[UINT16_SIZE + UINT32_SIZE]));
break;
case CMD_NODE_DESTROY:
fake_cmd = v_fake_node_destroy_ack_create(UINT32(cmd->data[0]));
break;
case CMD_TAGGROUP_CREATE:
fake_cmd = v_fake_taggroup_create_ack_create(UINT32(cmd->data[0]),
UINT16(cmd->data[UINT32_SIZE]));
break;
case CMD_TAGGROUP_DESTROY:
fake_cmd = v_fake_taggroup_destroy_ack_create(UINT32(cmd->data[0]),
UINT16(cmd->data[UINT32_SIZE]));
break;
case CMD_TAG_CREATE:
fake_cmd = v_tag_create_ack_create(UINT32(cmd->data[0]),
UINT16(cmd->data[UINT32_SIZE]),
UINT16(cmd->data[UINT32_SIZE + UINT16_SIZE]));
break;
case CMD_TAG_DESTROY:
fake_cmd = v_tag_destroy_ack_create(UINT32(cmd->data[0]),
UINT16(cmd->data[UINT32_SIZE]),
UINT16(cmd->data[UINT32_SIZE + UINT16_SIZE]));
break;
case CMD_LAYER_CREATE:
fake_cmd = v_fake_layer_create_ack_create(UINT32(cmd->data[0]),
UINT16(cmd->data[UINT32_SIZE + UINT16_SIZE]));
break;
case CMD_LAYER_DESTROY:
fake_cmd = v_fake_layer_destroy_ack_create(UINT32(cmd->data[0]),
UINT16(cmd->data[UINT32_SIZE]));
break;
default:
break;
}
if(fake_cmd != NULL) {
is_fake_cmd_received = 1;
/* Push command to the queue of incomming commands */
v_in_queue_push(vsession->in_queue, fake_cmd);
/* Print content of fake command */
v_fake_cmd_print(VRS_PRINT_DEBUG_MSG, fake_cmd);
}
}
/* Remove command from the history of sent commands */
ret = v_hash_array_remove_item(&history->cmd_hist[sent_cmd->id]->cmds, sent_cmd->vbucket->data);
if(ret == 1) {
/* Destroy command */
v_cmd_destroy(&cmd);
} else {
v_print_log(VRS_PRINT_ERROR, "Unable to remove command id: %d\n", sent_cmd->id);
ret = 0;
}
}
sent_cmd = sent_cmd->next;
}
/* Free linked list of sent commands */
v_list_free(&sent_packet->cmds);
/* Remove packet itself from the linked list of sent packet */
v_list_rem_item(&history->packets, sent_packet);
free(sent_packet);
ret = 1;
} else {
/* When acknowledged payload packet is not found in history, then it
* is OK, because it is probably keep alive packet without any node
* commands */
v_print_log(VRS_PRINT_DEBUG_MSG, "Packet with id: %d, not found in history\n", id);
}
/* When pure ack packet caused adding some fake commands to the queue, then
* poke server data thread */
if( (vs_ctx != NULL) && (is_fake_cmd_received == 1) && (r_packet->data == NULL)) {
sem_post(vs_ctx->data.sem);
}
return ret;
}
/**
* \brief WebSocket callback function for recived message
*/
void vs_ws_recv_msg_callback(wslay_event_context_ptr ctx,
const struct wslay_event_on_msg_recv_arg *arg,
void *user_data)
{
struct vContext *C = (struct vContext*)user_data;
struct VSession *session = CTX_current_session(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
(void)ctx;
if(!wslay_is_ctrl_frame(arg->opcode)) {
/* Verse server uses binary message for communication */
if(arg->opcode == WSLAY_BINARY_FRAME) {
struct wslay_event_msg msgarg;
v_print_log(VRS_PRINT_DEBUG_MSG,
"WS Callback received binary message\n");
/* Copy received data to IO context */
memcpy(io_ctx->buf, arg->msg, arg->msg_length);
io_ctx->buf_size = arg->msg_length;
if(session->stream_conn->host_state == TCP_SERVER_STATE_STREAM_OPEN) {
if(v_STREAM_handle_messages(C) == 0) {
/* TODO: end connection */
return;
}
} else {
if( vs_handle_handshake(C, NULL) == -1 ) {
/* TODO: end connection */
return;
}
msgarg.opcode = WSLAY_BINARY_FRAME;
msgarg.msg = (uint8_t*)io_ctx->buf;
msgarg.msg_length = io_ctx->buf_size;
wslay_event_queue_msg(ctx, &msgarg);
}
} else if(arg->opcode == WSLAY_TEXT_FRAME) {
v_print_log(VRS_PRINT_ERROR, "WebSocket text frame is not supported\n");
return;
}
} else {
/* Print opcode of control message */
v_print_log(VRS_PRINT_DEBUG_MSG,
"WS Callback Received Ctrl Message: opcode: %d\n",
arg->opcode);
/* Is it closing message? */
if(arg->opcode & WSLAY_CONNECTION_CLOSE) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"Close message with code: %d, message: %s\n",
arg->status_code,
arg->msg);
if(session->stream_conn->host_state == TCP_SERVER_STATE_CLOSING) {
session->stream_conn->host_state = TCP_SERVER_STATE_CLOSED;
} else {
session->stream_conn->host_state = TCP_SERVER_STATE_CLOSING;
wslay_event_queue_close(ctx,
WSLAY_CODE_NORMAL_CLOSURE,
(uint8_t*)"Closing connection",
15);
}
}
}
}
/**
* \brief The function with websocket infinite loop
*/
void *vs_websocket_loop(void *arg)
{
/* The vContext is passed as *user_data* in callback functions. */
struct vContext *C = (struct vContext*)arg;
struct VS_CTX *vs_ctx = CTX_server_ctx(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VStreamConn *stream_conn = CTX_current_stream_conn(C);
struct VSession *vsession = CTX_current_session(C);
struct VMessage *r_message=NULL, *s_message=NULL;
wslay_event_context_ptr wslay_ctx;
fd_set read_set, write_set;
struct timeval tv;
int ret, flags;
unsigned int int_size;
struct wslay_event_callbacks callbacks = {
vs_recv_ws_callback_data,
vs_send_ws_callback_data,
NULL,
NULL,
NULL,
NULL,
vs_ws_recv_msg_callback
};
/* Set socket blocking */
flags = fcntl(io_ctx->sockfd, F_GETFL, 0);
fcntl(io_ctx->sockfd, F_SETFL, flags & ~O_NONBLOCK);
http_handshake(io_ctx->sockfd);
/* Try to get size of TCP buffer */
int_size = sizeof(int_size);
getsockopt(io_ctx->sockfd, SOL_SOCKET, SO_RCVBUF,
(void *)&stream_conn->socket_buffer_size, &int_size);
r_message = (struct VMessage*)calloc(1, sizeof(struct VMessage));
s_message = (struct VMessage*)calloc(1, sizeof(struct VMessage));
CTX_r_message_set(C, r_message);
CTX_s_message_set(C, s_message);
stream_conn->host_state = TCP_SERVER_STATE_RESPOND_METHODS;
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: RESPOND_methods\n");
printf("%c[%dm", 27, 0);
}
/* Set non-blocking */
flags = fcntl(io_ctx->sockfd, F_GETFL, 0);
fcntl(io_ctx->sockfd, F_SETFL, flags | O_NONBLOCK);
wslay_event_context_server_init(&wslay_ctx, &callbacks, C);
/* "Never ending" loop */
while(vsession->stream_conn->host_state != TCP_SERVER_STATE_CLOSED)
{
if(vs_ctx->state != SERVER_STATE_READY) {
vsession->stream_conn->host_state = TCP_SERVER_STATE_CLOSING;
/* Try to close connection with websocket client */
wslay_event_queue_close(wslay_ctx,
WSLAY_CODE_GOING_AWAY,
(uint8_t*)"Server shutdown", /* Close message */
15); /* The length of close message s*/
}
/* Initialize read set */
FD_ZERO(&read_set);
FD_SET(io_ctx->sockfd, &read_set);
/* Initialize write set */
FD_ZERO(&write_set);
FD_SET(io_ctx->sockfd, &write_set);
/* Set timeout for select() */
if(stream_conn->host_state == TCP_SERVER_STATE_STREAM_OPEN) {
/* Use negotiated FPS */
tv.tv_sec = 0;
tv.tv_usec = 1000000/vsession->fps_host;
} else {
/* User have to send something in 30 seconds */
tv.tv_sec = VRS_TIMEOUT;
tv.tv_usec = 0;
}
if( (ret = select(io_ctx->sockfd+1,
&read_set,
&write_set,
NULL, /* Exception*/
&tv)) == -1) {
if(is_log_level(VRS_PRINT_ERROR)) v_print_log(VRS_PRINT_ERROR, "%s:%s():%d select(): %s\n",
__FILE__, __FUNCTION__, __LINE__, strerror(errno));
goto end;
/* Was event on the listen socket */
} else if(ret>0){
if(FD_ISSET(io_ctx->sockfd, &read_set)) {
if( wslay_event_recv(wslay_ctx) != 0 ) {
goto end;
}
} else if (FD_ISSET(io_ctx->sockfd, &write_set)) {
if( wslay_event_send(wslay_ctx) != 0 ) {
goto end;
}
}
}
if(stream_conn->host_state == TCP_SERVER_STATE_STREAM_OPEN) {
/* Check if there is any command in outgouing queue
* and eventually pack these commands to buffer */
if((ret = v_STREAM_pack_message(C)) == 0 ) {
goto end;
}
/* When at least one command was packed to buffer, then
* queue this buffer to WebSocket layer */
if(ret == 1) {
struct wslay_event_msg msgarg;
msgarg.opcode = WSLAY_BINARY_FRAME;
msgarg.msg = (uint8_t*)io_ctx->buf;
msgarg.msg_length = io_ctx->buf_size;
wslay_event_queue_msg(wslay_ctx, &msgarg);
}
}
}
end:
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: CLOSING\n");
printf("%c[%dm", 27, 0);
}
/* Set up TCP CLOSING state (non-blocking) */
vs_CLOSING(C);
/* Receive and Send messages are not neccessary any more */
if(r_message!=NULL) {
free(r_message);
r_message = NULL;
CTX_r_message_set(C, NULL);
}
if(s_message!=NULL) {
free(s_message);
s_message = NULL;
CTX_s_message_set(C, NULL);
}
/* TCP connection is considered as CLOSED, but it is not possible to use
* this connection for other client */
stream_conn->host_state = TCP_SERVER_STATE_CLOSED;
/* NULL pointer at stream connection */
CTX_current_stream_conn_set(C, NULL);
/* Set TCP connection to CLOSED */
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: CLOSED\n");
printf("%c[%dm", 27, 0);
}
pthread_mutex_lock(&vs_ctx->data.mutex);
/* Unsubscribe this session (this avatar) from all nodes */
vs_node_free_avatar_reference(vs_ctx, vsession);
/* Try to destroy avatar node */
vs_node_destroy_avatar_node(vs_ctx, vsession);
pthread_mutex_unlock(&vs_ctx->data.mutex);
/* This session could be used again for authentication */
stream_conn->host_state=TCP_SERVER_STATE_LISTEN;
/* Clear session flags */
vsession->flags = 0;
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: LISTEN\n");
printf("%c[%dm", 27, 0);
}
free(C);
C = NULL;
pthread_exit(NULL);
return NULL;
}
/**
* \brief This function handles messages received during verse handshake
* and it can create new thread for datagram connection.
*/
int vs_handle_handshake(struct vContext *C, char *u_name)
{
struct VSession *vsession = CTX_current_session(C);
struct VStreamConn *stream_conn = CTX_current_stream_conn(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
int ret;
/* Make sure, that buffer contains at least Verse message
* header. If this condition is not reached, then somebody tries
* to do some very bad things! .. Close this connection. */
if(io_ctx->buf_size < VERSE_MESSAGE_HEADER_SIZE) {
if(is_log_level(VRS_PRINT_ERROR)) v_print_log(VRS_PRINT_ERROR, "received buffer too small %d\n",
io_ctx->buf_size);
return -1;
}
switch(stream_conn->host_state) {
case TCP_SERVER_STATE_RESPOND_METHODS:
ret = vs_RESPOND_methods_loop(C);
if(ret==1) {
stream_conn->host_state = TCP_SERVER_STATE_RESPOND_USRAUTH;
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: RESPOND_userauth\n");
printf("%c[%dm", 27, 0);
}
} else {
return -1;
}
break;
case TCP_SERVER_STATE_RESPOND_USRAUTH:
ret = vs_RESPOND_userauth_loop(C);
if(ret==1) {
stream_conn->host_state = TCP_SERVER_STATE_NEGOTIATE_COOKIE_DED;
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: NEGOTIATE_cookie_ded\n");
printf("%c[%dm", 27, 0);
}
} else {
vsession->usr_auth_att++;
if(vsession->usr_auth_att >= MAX_USER_AUTH_ATTEMPTS) {
return -1;
}
}
break;
#ifdef WITH_KERBEROS
case TCP_SERVER_STATE_RESPOND_KRB_AUTH:
ret = vs_RESPOND_krb_auth_loop(C, u_name);
if (ret == 1) {
stream_conn->host_state = TCP_SERVER_STATE_NEGOTIATE_COOKIE_DED;
if (is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG,
"Server TCP state: NEGOTIATE_cookie_ded\n");
printf("%c[%dm", 27, 0);
}
} else {
return -1;
}
break;
#endif
case TCP_SERVER_STATE_NEGOTIATE_COOKIE_DED:
ret = vs_NEGOTIATE_cookie_ded_loop(C);
if(ret==1) {
stream_conn->host_state = TCP_SERVER_STATE_NEGOTIATE_NEWHOST;
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: NEGOTIATE_newhost\n");
printf("%c[%dm", 27, 0);
}
} else {
return -1;
}
break;
case TCP_SERVER_STATE_NEGOTIATE_NEWHOST:
/* Wait VERSE_TIMEOT seconds to confirming proposed URL */
ret = vs_NEGOTIATE_newhost_loop(C);
if(ret == 1) {
if(vsession->flags & VRS_TP_UDP) {
/* When URL was confirmed, then go to the end state */
return -1;
} else if(vsession->flags & VRS_TP_TCP) {
stream_conn->host_state = TCP_SERVER_STATE_STREAM_OPEN;
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: STREAM_OPEN\n");
printf("%c[%dm", 27, 0);
}
vs_STREAM_OPEN_tcp_loop(C);
return -1;
} else if(vsession->flags & VRS_TP_WEBSOCKET) {
stream_conn->host_state = TCP_SERVER_STATE_STREAM_OPEN;
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: STREAM_OPEN\n");
printf("%c[%dm", 27, 0);
}
}
} else {
/* When thread was not confirmed, then try to cancel
* UDP thread*/
if(pthread_cancel(vsession->udp_thread) != 0) {
v_print_log(VRS_PRINT_DEBUG_MSG, "UDP thread was not canceled\n");
}
return -1;
}
break;
}
return 1;
}
/* Create new UDP connection to the server */
struct VDgramConn *vc_create_client_dgram_conn(struct vContext *C)
{
struct VSession *vsession = CTX_current_session(C);
struct VDgramConn *dgram_conn = NULL;
struct addrinfo hints, *result, *rp;
int sockfd = -1;
int flag, ret;
struct VURL url;
/* Seed random number generator, */
#ifdef __APPLE__
sranddev();
/* Other BSD based systems probably support this or similar function too. */
#else
/* Other systems have to use this evil trick */
struct timeval tv;
gettimeofday(&tv, NULL);
srand(tv.tv_sec - tv.tv_usec);
#endif
if (v_url_parse(vsession->host_url, &url) != 1) {
goto end;
} else {
/* v_print_url(VRS_PRINT_DEBUG_MSG, &url); */
}
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
hints.ai_socktype = SOCK_DGRAM; /* Allow datagram protocol */
hints.ai_flags = 0; /* No flags required */
hints.ai_protocol = IPPROTO_UDP; /* Allow UDP protocol only */
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
if(url.ip_ver==IPV6) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"Try to connect to: [%s]:%s\n",
url.node, url.service);
} else {
v_print_log(VRS_PRINT_DEBUG_MSG,
"Try to connect to: %s:%s\n",
url.node, url.service);
}
}
if( (ret = getaddrinfo(url.node, url.service, &hints, &result)) !=0 ) {
v_print_log(VRS_PRINT_ERROR,
"getaddrinfo(): %s\n", gai_strerror(ret));
goto end;
}
/* Try to use addrinfo from getaddrinfo() */
for(rp=result; rp!=NULL; rp=rp->ai_next) {
if( (sockfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) == -1) {
v_print_log(VRS_PRINT_ERROR, "socket(): %s\n", strerror(errno));
continue;
}
else {
/* Try to "connect" to this address ... the client will be able to send and
* receive packets only from this address. */
if(connect(sockfd, rp->ai_addr, rp->ai_addrlen) != -1)
break;
close(sockfd);
sockfd = -1;
}
}
if(rp == NULL) {
if(is_log_level(VRS_PRINT_ERROR)) {
if(url.ip_ver==IPV6) {
v_print_log(VRS_PRINT_ERROR,
"Could not connect to the [%s]:%s\n",
url.node, url.service);
} else {
v_print_log(VRS_PRINT_ERROR,
"Could not connect to the %s:%s\n",
url.node, url.service);
}
}
freeaddrinfo(result);
goto end;
}
if( (dgram_conn = (struct VDgramConn*)calloc(1, sizeof(struct VDgramConn))) == NULL) {
v_print_log(VRS_PRINT_ERROR, "calloc(): %s\n", strerror(errno));
freeaddrinfo(result);
if(sockfd != -1) {
close(sockfd);
}
goto end;
}
/* Initialize datagram connection */
v_conn_dgram_init(dgram_conn);
/* Use first successfully assigned socket */
dgram_conn->io_ctx.sockfd = sockfd;
/* Set socket non-blocking */
flag = fcntl(dgram_conn->io_ctx.sockfd, F_GETFL, 0);
if( (fcntl(dgram_conn->io_ctx.sockfd, F_SETFL, flag | O_NONBLOCK)) == -1) {
v_print_log(VRS_PRINT_ERROR, "fcntl(): %s\n", strerror(errno));
free(dgram_conn);
dgram_conn = NULL;
if(sockfd != -1) {
close(sockfd);
}
freeaddrinfo(result);
goto end;
}
/* Set socket to reuse address */
flag = 1;
if( setsockopt(dgram_conn->io_ctx.sockfd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(flag)) == -1) {
v_print_log(VRS_PRINT_ERROR, "setsockopt(): %s\n", strerror(errno));
free(dgram_conn);
if(sockfd != -1) {
close(sockfd);
}
dgram_conn = NULL;
goto end;
}
/* Set address of peer and host */
if(rp->ai_family==AF_INET) {
/* Address type of client */
dgram_conn->io_ctx.host_addr.ip_ver = IPV4;
dgram_conn->io_ctx.host_addr.protocol = UDP;
/* Address of peer */
dgram_conn->io_ctx.peer_addr.ip_ver = IPV4;
dgram_conn->io_ctx.peer_addr.protocol = UDP;
dgram_conn->io_ctx.peer_addr.port = ntohs(((struct sockaddr_in*)rp->ai_addr)->sin_port);
memcpy(&dgram_conn->io_ctx.peer_addr.addr.ipv4, rp->ai_addr, rp->ai_addrlen);
/* Address of peer (reference in connection) */
dgram_conn->peer_address.ip_ver = IPV4;
dgram_conn->peer_address.protocol = UDP;
dgram_conn->peer_address.port = ntohs(((struct sockaddr_in*)rp->ai_addr)->sin_port);
memcpy(&dgram_conn->peer_address.addr.ipv4, rp->ai_addr, rp->ai_addrlen);
}
else if(rp->ai_family==AF_INET6) {
/* Address type of client */
dgram_conn->io_ctx.host_addr.ip_ver = IPV6;
dgram_conn->io_ctx.host_addr.protocol = UDP;
/* Address of peer */
dgram_conn->io_ctx.peer_addr.ip_ver = IPV6;
dgram_conn->io_ctx.peer_addr.protocol = UDP;
dgram_conn->io_ctx.peer_addr.port = ntohs(((struct sockaddr_in6*)rp->ai_addr)->sin6_port);
memcpy(&dgram_conn->io_ctx.peer_addr.addr.ipv6, rp->ai_addr, rp->ai_addrlen);
/* Address of peer (reference in connection) */
dgram_conn->peer_address.ip_ver = IPV6;
dgram_conn->peer_address.protocol = UDP;
dgram_conn->peer_address.port = ntohs(((struct sockaddr_in6*)rp->ai_addr)->sin6_port);
memcpy(&dgram_conn->peer_address.addr.ipv6, rp->ai_addr, rp->ai_addrlen);
}
freeaddrinfo(result);
/* When DTLS was negotiated, then set flag */
if(url.security_protocol == VRS_SEC_DATA_TLS) {
#if (defined WITH_OPENSSL) && OPENSSL_VERSION_NUMBER>=0x10000000
dgram_conn->io_ctx.flags |= SOCKET_SECURED;
#else
v_print_log(VRS_PRINT_ERROR,
"Server tries to force client to use secured connection, but it is not supported\n");
goto end;
#endif
}
#ifdef WITH_OPENSSL
/* Create BIO, connect and set to already connected */
if( (dgram_conn->io_ctx.bio = BIO_new_dgram(dgram_conn->io_ctx.sockfd, BIO_CLOSE)) == NULL) {
v_print_log(VRS_PRINT_ERROR, "BIO_new_dgram()\n");
goto end;
}
/* Try to do PMTU discovery */
if( BIO_ctrl(dgram_conn->io_ctx.bio, BIO_CTRL_DGRAM_MTU_DISCOVER, 0, NULL) < 0) {
v_print_log(VRS_PRINT_ERROR, "BIO_ctrl()\n");
goto end;
}
/* Try to get MTU from the bio */
ret = BIO_ctrl(dgram_conn->io_ctx.bio, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
if(ret > 0) {
dgram_conn->io_ctx.mtu = ret;
v_print_log(VRS_PRINT_DEBUG_MSG, "PMTU: %d\n", dgram_conn->io_ctx.mtu);
} else {
dgram_conn->io_ctx.mtu = DEFAULT_MTU;
v_print_log(VRS_PRINT_DEBUG_MSG, "Default MTU: %d\n", dgram_conn->io_ctx.mtu);
}
#else
dgram_conn->io_ctx.mtu = DEFAULT_MTU;
#endif
/* Set up necessary flag for V_CTX (client will be able to send and receive packets only to/from server) */
dgram_conn->io_ctx.flags |= SOCKET_CONNECTED;
dgram_conn->host_id = (unsigned int)rand();
end:
v_url_clear(&url);
return dgram_conn;
}
/**
* \brief This function is never ending loop of server state STREAM_OPEN.
* This loop is used, when Verse server uses TCP for data exchange (not
* UDP nor WebSocket)
*/
int vs_STREAM_OPEN_tcp_loop(struct vContext *C)
{
struct VS_CTX *vs_ctx = CTX_server_ctx(C);
struct VSession *vsession = CTX_current_session(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct timeval tv;
fd_set set;
int flag, ret, error;
/* Set socket non-blocking */
flag = fcntl(io_ctx->sockfd, F_GETFL, 0);
if( (fcntl(io_ctx->sockfd, F_SETFL, flag | O_NONBLOCK)) == -1) {
if(is_log_level(VRS_PRINT_ERROR)) v_print_log(VRS_PRINT_ERROR, "fcntl(): %s\n", strerror(errno));
return -1;
}
/* "Never ending" loop */
while(1)
{
FD_ZERO(&set);
FD_SET(io_ctx->sockfd, &set);
/* Use negotiated FPS */
tv.tv_sec = 0;
tv.tv_usec = 1000000/vsession->fps_host;
/* Wait for recieved data */
if( (ret = select(io_ctx->sockfd+1, &set, NULL, NULL, &tv)) == -1) {
if(is_log_level(VRS_PRINT_ERROR)) v_print_log(VRS_PRINT_ERROR, "%s:%s():%d select(): %s\n",
__FILE__, __FUNCTION__, __LINE__, strerror(errno));
goto end;
/* Was event on the listen socket */
} else if(ret>0 && FD_ISSET(io_ctx->sockfd, &set)) {
/* Try to receive data through SSL connection */
if( v_tcp_read(io_ctx, &error) <= 0 ) {
goto end;
}
if(v_STREAM_handle_messages(C) == 0) {
goto end;
}
/* When some payload data were received, then poke data thread */
sem_post(vs_ctx->data.sem);
}
if( (ret = v_STREAM_pack_message(C)) == 0 ) {
goto end;
}
/* Send command to the client */
if(ret == 1) {
if( v_tcp_write(io_ctx, &error) <= 0) {
goto end;
}
}
}
end:
/* Set socket blocking again */
flag = fcntl(io_ctx->sockfd, F_GETFL, 0);
if( (fcntl(io_ctx->sockfd, F_SETFL, flag & ~O_NONBLOCK)) == -1) {
if(is_log_level(VRS_PRINT_ERROR)) v_print_log(VRS_PRINT_ERROR, "fcntl(): %s\n", strerror(errno));
return -1;
}
return 0;
}
/**
* \brief This function is the callback function for received Confirm_L
* commands in REQUEST state.
*/
static int vc_REQUEST_CONFIRM_L_cb(struct vContext *C, struct Generic_Cmd *cmd)
{
struct VC_CTX *vc_ctx = CTX_client_ctx(C);
struct VSession *vsession = CTX_current_session(C);
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct Negotiate_Cmd *confirm_l_cmd = (struct Negotiate_Cmd*)cmd;
if(confirm_l_cmd->feature == FTR_TOKEN) {
/* This block of code checks if the server confirmed send token. */
if( vsession->host_token.str != NULL &&
confirm_l_cmd->count == 1 &&
strcmp((char*)confirm_l_cmd->value[0].string8.str, vsession->host_token.str)==0 )
{
v_print_log(VRS_PRINT_DEBUG_MSG,
"Local TOKEN: %s confirmed\n",
confirm_l_cmd->value[0].string8.str);
return 1;
} else {
v_print_log(VRS_PRINT_WARNING,
"COOCKIE: %s not confirmed\n",
vsession->peer_token.str);
return 0;
}
}
/* Server should confirm client proposal of Congestion Control (local) */
if(confirm_l_cmd->feature == FTR_CC_ID) {
/* TODO: better implementation */
if(confirm_l_cmd->count == 1 && /* Any confirm command has to include only one value */
confirm_l_cmd->value[0].uint8 == CC_NONE) { /* list of supported methods */
v_print_log(VRS_PRINT_DEBUG_MSG,
"Local Congestion Control ID: %d confirmed\n",
confirm_l_cmd->value[0].uint8);
dgram_conn->cc_meth = CC_NONE;
return 1;
} else {
v_print_log(VRS_PRINT_ERROR, "Unsupported Congestion Control\n");
return 0;
}
}
/* Server should confirm client proposal of Flow Control Window scale (local) */
if(confirm_l_cmd->feature == FTR_RWIN_SCALE) {
if(confirm_l_cmd->count == 1 ) {
if(vc_ctx->rwin_scale == confirm_l_cmd->value[0].uint8) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"Scale of host RWIN: %d confirmed\n", vc_ctx->rwin_scale);
dgram_conn->rwin_host_scale = vc_ctx->rwin_scale;
return 1;
} else {
v_print_log(VRS_PRINT_ERROR, "Scale of RWIN: %d != %d wasn't confirmed\n",
vc_ctx->rwin_scale,
confirm_l_cmd->value[0].uint8);
dgram_conn->rwin_host_scale = 0;
return 0;
}
} else {
v_print_log(VRS_PRINT_ERROR, "One value of RWIN scale should to be confirmed\n");
return 0;
}
}
/* Server should confirm client proposal of command compression */
if(confirm_l_cmd->feature == FTR_CMD_COMPRESS) {
if(confirm_l_cmd->count == 1) {
if(confirm_l_cmd->value[0].uint8 == CMPR_NONE ||
confirm_l_cmd->value[0].uint8 == CMPR_ADDR_SHARE)
{
v_print_log(VRS_PRINT_DEBUG_MSG, "Local Command Compression: %d confirmed\n",
confirm_l_cmd->value[0].uint8);
dgram_conn->host_cmd_cmpr = confirm_l_cmd->value[0].uint8;
return 1;
} else {
v_print_log(VRS_PRINT_ERROR, "Unsupported Command Compress\n");
return 0;
}
}
}
/* Ignore unknown feature */
return 1;
}
/**
* \brief This function is called, when server is in NEGOTIATE_cookie_ded state
*
* This function can create new thread for datagram connection
*/
int vs_NEGOTIATE_cookie_ded_loop(struct vContext *C)
{
struct VS_CTX *vs_ctx = CTX_server_ctx(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VSession *vsession = CTX_current_session(C);
struct VMessage *r_message = CTX_r_message(C);
struct VMessage *s_message = CTX_s_message(C);
int i, j, ret;
unsigned short buffer_pos = 0;
int host_url_proposed = 0,
host_cookie_proposed = 0,
peer_cookie_confirmed = 0,
ded_confirmed = 0,
client_name_proposed = 0,
client_version_proposed = 0;
struct timeval tv;
struct VURL url;
/* Reset content of received message */
memset(r_message, 0, sizeof(struct VMessage));
/* Unpack Verse message header */
buffer_pos += v_unpack_message_header(&io_ctx->buf[buffer_pos], (io_ctx->buf_size - buffer_pos), r_message);
/* Unpack all system commands */
buffer_pos += v_unpack_message_system_commands(&io_ctx->buf[buffer_pos], (io_ctx->buf_size - buffer_pos), r_message);
v_print_receive_message(C);
/* Process all received system commands */
for(i=0;
i<MAX_SYSTEM_COMMAND_COUNT &&
r_message->sys_cmd[i].cmd.id!=CMD_RESERVED_ID;
i++)
{
switch(r_message->sys_cmd[i].cmd.id) {
case CMD_CHANGE_R_ID:
/* Client has to propose url in this state */
if(r_message->sys_cmd[i].negotiate_cmd.feature == FTR_HOST_URL) {
if(r_message->sys_cmd[i].negotiate_cmd.count > 0) {
if(vsession->host_url!=NULL) {
free(vsession->host_url);
}
/* Only first proposed URL will be used */
vsession->host_url = strdup((char*)r_message->sys_cmd[i].negotiate_cmd.value[0].string8.str);
/* Check if proposed URL is correct */
ret = v_parse_url(vsession->host_url, &url);
if(ret == 1)
host_url_proposed = 1;
else
host_url_proposed = 0;
}
/* Client has to propose host cookie in this state */
} else if(r_message->sys_cmd[i].negotiate_cmd.feature == FTR_COOKIE) {
if(r_message->sys_cmd[i].negotiate_cmd.count > 0) {
if(vsession->host_cookie.str != NULL) {
free(vsession->host_cookie.str);
}
vsession->host_cookie.str = strdup((char*)r_message->sys_cmd[i].negotiate_cmd.value[0].string8.str);
host_cookie_proposed = 1;
}
} else {
v_print_log(VRS_PRINT_WARNING, "This feature id: %d is not supported in this state\n",
r_message->sys_cmd[i].negotiate_cmd.feature);
}
break;
case CMD_CHANGE_L_ID:
/* Client could propose client name and version */
if(r_message->sys_cmd[i].negotiate_cmd.feature == FTR_CLIENT_NAME) {
if(r_message->sys_cmd[i].negotiate_cmd.count > 0) {
/* Only first proposed client name will be used */
vsession->client_name = strdup((char*)r_message->sys_cmd[i].negotiate_cmd.value[0].string8.str);
client_name_proposed = 1;
}
} else if(r_message->sys_cmd[i].negotiate_cmd.feature == FTR_CLIENT_VERSION) {
if(r_message->sys_cmd[i].negotiate_cmd.count > 0) {
/* Only first proposed client name will be used */
vsession->client_version = strdup((char*)r_message->sys_cmd[i].negotiate_cmd.value[0].string8.str);
client_version_proposed = 1;
}
}
break;
case CMD_CONFIRM_R_ID:
/* Client has to confirm peer cookie in this state */
if(r_message->sys_cmd[i].negotiate_cmd.feature == FTR_COOKIE) {
if (r_message->sys_cmd[i].negotiate_cmd.count == 1) {
if(vsession->peer_cookie.str != NULL &&
strcmp(vsession->peer_cookie.str, (char*)r_message->sys_cmd[i].negotiate_cmd.value[0].string8.str) == 0)
{
gettimeofday(&tv, NULL);
vsession->peer_cookie.tv.tv_sec = tv.tv_sec;
vsession->peer_cookie.tv.tv_usec = tv.tv_usec;
peer_cookie_confirmed = 1;
}
}
} else {
v_print_log(VRS_PRINT_WARNING, "This feature id: %d is not supported in this state\n",
r_message->sys_cmd[i].negotiate_cmd.feature);
}
break;
case CMD_CONFIRM_L_ID:
/* Client has to confirm DED in this state */
if(r_message->sys_cmd[i].negotiate_cmd.feature == FTR_DED) {
if(r_message->sys_cmd[i].negotiate_cmd.count == 1) {
if(vsession->ded.str != NULL &&
strcmp(vsession->ded.str, (char*)r_message->sys_cmd[i].negotiate_cmd.value[0].string8.str) == 0)
{
ded_confirmed = 1;
} else {
printf("%s != %s\n", vsession->ded.str, (char*)r_message->sys_cmd[i].negotiate_cmd.value[0].string8.str);
}
}
}
break;
default:
v_print_log(VRS_PRINT_WARNING, "This command id: %d is not supported in this state\n",
r_message->sys_cmd[i].cmd.id);
break;
}
}
/* Send response on cookie request */
if(host_url_proposed==1 &&
host_cookie_proposed==1 &&
peer_cookie_confirmed==1 &&
ded_confirmed==1)
{
struct vContext *new_C;
char trans_proto[4];
char sec_proto[5];
int cmd_rank = 0;
buffer_pos = VERSE_MESSAGE_HEADER_SIZE;
/* Copy address of peer */
memcpy(&vsession->peer_address, &io_ctx->peer_addr, sizeof(struct VNetworkAddress));
/* Do not confirm proposed URL */
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CONFIRM_R_ID, FTR_HOST_URL, NULL);
/* Find first unused port from port range */
for(i=vs_ctx->port_low, j=0; i<vs_ctx->port_high; i++, j++) {
if(!(vs_ctx->port_list[j].flag & SERVER_PORT_USED)) {
vsession->dgram_conn->io_ctx.host_addr.port = vs_ctx->port_list[j].port_number;
vs_ctx->port_list[j].flag |= SERVER_PORT_USED;
break;
}
}
/* Do not allow unsecure TCP data connection */
if(url.transport_protocol == VRS_TP_TCP) {
url.security_protocol = VRS_SEC_DATA_TLS;
}
/* Copy settings about data connection to the session */
vsession->flags |= url.security_protocol;
vsession->flags |= url.transport_protocol;
if(vsession->flags & VRS_TP_UDP) {
strncpy(trans_proto, "udp", 3);
trans_proto[3] = '\0';
/* Create copy of new Verse context for new thread */
new_C = (struct vContext*)calloc(1, sizeof(struct vContext));
memcpy(new_C, C, sizeof(struct vContext));
/* Try to create new thread */
if((ret = pthread_create(&vsession->udp_thread, NULL, vs_main_dgram_loop, (void*)new_C)) != 0) {
if(is_log_level(VRS_PRINT_ERROR)) v_print_log(VRS_PRINT_ERROR, "pthread_create(): %s\n", strerror(errno));
ret = 0;
goto end;
}
/* Wait for datagram thread to be in LISTEN state */
while(vsession->dgram_conn->host_state != UDP_SERVER_STATE_LISTEN) {
/* Sleep 1 milisecond */
usleep(1000);
}
} else if(vsession->flags & VRS_TP_TCP) {
strncpy(trans_proto, "tcp", 3);
trans_proto[3] = '\0';
} else if(vsession->flags & VRS_TP_WEBSOCKET) {
strncpy(trans_proto, "wss", 3);
trans_proto[3] = '\0';
}
#if (defined WITH_OPENSSL) && OPENSSL_VERSION_NUMBER>=0x10000000
if(url.security_protocol==VRS_SEC_DATA_NONE ||
!(vs_ctx->security_protocol & VRS_SEC_DATA_TLS))
{
strncpy(sec_proto, "none", 4);
sec_proto[4] = '\0';
} else if(url.security_protocol==VRS_SEC_DATA_TLS) {
if(vsession->flags & VRS_TP_UDP) {
strncpy(sec_proto, "dtls", 4);
sec_proto[4] = '\0';
} else if((vsession->flags & VRS_TP_TCP) ||
(vsession->flags & VRS_TP_WEBSOCKET))
{
strncpy(sec_proto, "tls", 3);
sec_proto[3] = '\0';
}
} else {
strncpy(sec_proto, "none", 4);
sec_proto[4] = '\0';
}
#else
strncpy(sec_proto, "none", 4);
sec_proto[4] = '\0';
#endif
/* Free proposed and now obsolete URL */
if(vsession->host_url != NULL) {
free(vsession->host_url);
vsession->host_url = NULL;
}
/* Set right host URL */
vsession->host_url = calloc(UCHAR_MAX, sizeof(char));
if(url.ip_ver==IPV6) {
sprintf(vsession->host_url, "verse-%s-%s://[%s]:%d",
trans_proto,
sec_proto,
url.node,
vsession->dgram_conn->io_ctx.host_addr.port);
} else {
sprintf(vsession->host_url, "verse-%s-%s://%s:%d",
trans_proto,
sec_proto,
url.node,
vsession->dgram_conn->io_ctx.host_addr.port);
}
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CHANGE_L_ID, FTR_HOST_URL, vsession->host_url, NULL);
/* Set time for the host cookie */
gettimeofday(&tv, NULL);
vsession->host_cookie.tv.tv_sec = tv.tv_sec;
vsession->host_cookie.tv.tv_usec = tv.tv_usec;
/* Send confirmation about host cookie */
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CONFIRM_R_ID, FTR_COOKIE,
vsession->host_cookie.str, NULL);
/* Send confirmation about client name */
if(client_name_proposed == 1) {
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CONFIRM_L_ID, FTR_CLIENT_NAME,
vsession->client_name, NULL);
}
/* Send confirmation about client version only in situation, when
* client proposed client name too */
if(client_version_proposed == 1) {
if(client_name_proposed == 1) {
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CONFIRM_L_ID, FTR_CLIENT_VERSION,
vsession->client_version, NULL);
} else {
/* Client version without client name is not allowed */
v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank++, CMD_CONFIRM_L_ID, FTR_CLIENT_VERSION,
NULL);
}
}
/* Pack all system commands to the buffer */
buffer_pos += v_pack_stream_system_commands(s_message, &io_ctx->buf[buffer_pos]);
/* Update length of message in the header (data in buffer) */
s_message->header.version = VRS_VERSION;
s_message->header.len = io_ctx->buf_size = buffer_pos;
/* Pack header to the beginning of the buffer */
v_pack_message_header(s_message, io_ctx->buf);
v_print_send_message(C);
ret = 1;
} else {
ret = 0;
}
end:
v_clear_url(&url);
return ret;
}
/**
* \brief This function try to pack message that is going to be
* sent in STREAM OPEN state
*
* \param[in] *C The pointer at context
*
* \return This function return 1, when there is something to send,
* it returns -1, when there is nothing to send and it returns 0, when
* there is some error
*/
int v_STREAM_pack_message(struct vContext *C)
{
struct VS_CTX *vs_ctx = CTX_server_ctx(C);
struct VSession *vsession = CTX_current_session(C);
struct VStreamConn *conn = CTX_current_stream_conn(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VMessage *s_message = CTX_s_message(C);
struct Generic_Cmd *cmd, *fake_cmd;
int ret = -1, queue_size = 0, buffer_pos = 0, prio_cmd_count, cmd_rank=0;
int8 cmd_share;
int16 prio, max_prio, min_prio;
uint16 cmd_count, cmd_len, prio_win, swin, sent_size, tot_cmd_size;
real32 prio_sum_high, prio_sum_low, r_prio;
int is_fake_cmd_received = 0;
/* Is here something to send? */
if((v_out_queue_get_count(vsession->out_queue) > 0) ||
(vsession->tmp_flags & SYS_CMD_NEGOTIATE_FPS))
{
/* Get current size of data in TCP outgoing buffer */
#ifdef __linux__
if( ioctl(io_ctx->sockfd, SIOCOUTQ, &queue_size) == -1 ) {
v_print_log(VRS_PRINT_ERROR,
"ioctl(%d, SIOCOUTQ, ...): %s\n",
io_ctx->sockfd,
strerror(errno));
return 0;
}
#endif
/* Compute, how many data could be added to the TCP stack? */
swin = conn->socket_buffer_size - queue_size;
buffer_pos = VERSE_MESSAGE_HEADER_SIZE;
s_message->sys_cmd[0].cmd.id = CMD_RESERVED_ID;
/* When negotiated and used FPS is different, then pack negotiate command
* for FPS */
if(vsession->fps_host != vsession->fps_peer) {
cmd_rank += v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_FPS, &vsession->fps_host, NULL);
} else {
if(vsession->tmp_flags & SYS_CMD_NEGOTIATE_FPS) {
cmd_rank += v_add_negotiate_cmd(s_message->sys_cmd, cmd_rank,
CMD_CONFIRM_L_ID, FTR_FPS, &vsession->fps_peer, NULL);
/* Send confirmation only once for received system command */
vsession->tmp_flags &= ~SYS_CMD_NEGOTIATE_FPS;
}
}
buffer_pos += v_pack_stream_system_commands(s_message, &io_ctx->buf[buffer_pos]);
max_prio = v_out_queue_get_max_prio(vsession->out_queue);
min_prio = v_out_queue_get_min_prio(vsession->out_queue);
prio_sum_high = v_out_queue_get_prio_sum_high(vsession->out_queue);
prio_sum_low = v_out_queue_get_prio_sum_low(vsession->out_queue);
v_print_log(VRS_PRINT_DEBUG_MSG, "Packing prio queues, cmd count: %d\n",
v_out_queue_get_count(vsession->out_queue));
/* Go through all priorities and pick commands from priority queues */
for(prio = max_prio; prio >= min_prio; prio--)
{
prio_cmd_count = v_out_queue_get_count_prio(vsession->out_queue, prio);
if(prio_cmd_count > 0) {
r_prio = v_out_queue_get_prio(vsession->out_queue, prio);
/* Compute size of buffer that could be occupied by
* commands from this queue */
if(prio >= VRS_DEFAULT_PRIORITY) {
prio_win = ((swin - buffer_pos)*r_prio)/prio_sum_high;
} else {
prio_win = ((swin - buffer_pos)*r_prio)/prio_sum_low;
}
/* Debug print */
v_print_log(VRS_PRINT_DEBUG_MSG, "Queue: %d, count: %d, r_prio: %6.3f, prio_win: %d\n",
prio, prio_cmd_count, r_prio, prio_win);
/* Get total size of commands that were stored in queue (sent_size) */
sent_size = 0;
tot_cmd_size = 0;
while(prio_cmd_count > 0) {
cmd_share = 0;
cmd_count = 0;
cmd_len = prio_win - sent_size;
/* Pack commands from queues with high priority to the buffer */
cmd = v_out_queue_pop(vsession->out_queue, prio, &cmd_count, &cmd_share, &cmd_len);
if(cmd != NULL) {
/* Is this command fake command? */
if(cmd->id < MIN_CMD_ID) {
if(cmd->id == FAKE_CMD_CONNECT_TERMINATE) {
/* Close connection */
struct VS_CTX *vs_ctx = CTX_server_ctx(C);
if(vs_ctx != NULL) {
vsession->stream_conn->host_state = TCP_SERVER_STATE_CLOSING;
} else {
vsession->stream_conn->host_state = TCP_CLIENT_STATE_CLOSING;
}
} else if(cmd->id == FAKE_CMD_FPS) {
struct Fps_Cmd *fps_cmd = (struct Fps_Cmd*)cmd;
/* Change value of FPS. It will be sent in negotiate command
* until it is confirmed be the peer (server) */
vsession->fps_host = fps_cmd->fps;
}
} else {
buffer_pos += tot_cmd_size = v_cmd_pack(&io_ctx->buf[buffer_pos], cmd, v_cmd_size(cmd), 0);
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 32);
v_cmd_print(VRS_PRINT_DEBUG_MSG, cmd);
printf("%c[%dm", 27, 0);
}
sent_size += tot_cmd_size;
}
fake_cmd = v_cmd_fake_ack(cmd);
if(fake_cmd != NULL) {
is_fake_cmd_received = 1;
/* Push command to the queue of incoming commands */
v_in_queue_push(vsession->in_queue, fake_cmd);
/* Print content of fake command */
v_fake_cmd_print(VRS_PRINT_DEBUG_MSG, fake_cmd);
}
/* It is not necessary to put cmd to history of sent commands,
* when TCP is used. */
v_cmd_destroy(&cmd);
prio_cmd_count--;
} else {
break;
}
}
}
}
s_message->header.len = io_ctx->buf_size = buffer_pos;
s_message->header.version = VRS_VERSION;
/* Pack header to the beginning of the buffer */
v_pack_message_header(s_message, io_ctx->buf);
/* Debug print of command to be send */
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
v_print_send_message(C);
}
/* When pure ack packet caused adding some fake commands to the queue, then
* poke server data thread */
if( (vs_ctx != NULL) && (is_fake_cmd_received == 1)) {
sem_post(vs_ctx->data.sem);
}
ret = 1;
}
return ret;
}
/**
* \brief Main function for new thread. This thread is created for new
* connection with client. This thread will try to authenticate new user
* and negotiate new udp port. */
void *vs_tcp_conn_loop(void *arg)
{
struct vContext *C = (struct vContext*)arg;
struct VS_CTX *vs_ctx = CTX_server_ctx(C);
struct VSession *vsession = CTX_current_session(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VStreamConn *stream_conn = CTX_current_stream_conn(C);
struct VMessage *r_message=NULL, *s_message=NULL;
struct timeval tv;
fd_set set;
int error, ret;
void *udp_thread_result;
unsigned int int_size;
/* Try to get size of TCP buffer */
int_size = sizeof(int_size);
getsockopt(io_ctx->sockfd, SOL_SOCKET, SO_RCVBUF,
(void *)&stream_conn->socket_buffer_size, &int_size);
#ifdef WITH_OPENSSL
/* Try to do TLS handshake with client */
if(vs_TLS_handshake(C)!=1) {
goto end;
}
#endif
r_message = (struct VMessage*)calloc(1, sizeof(struct VMessage));
s_message = (struct VMessage*)calloc(1, sizeof(struct VMessage));
CTX_r_message_set(C, r_message);
CTX_s_message_set(C, s_message);
stream_conn->host_state = TCP_SERVER_STATE_RESPOND_METHODS;
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: RESPOND_methods\n");
printf("%c[%dm", 27, 0);
}
/* "Never ending" loop */
while(1)
{
FD_ZERO(&set);
FD_SET(io_ctx->sockfd, &set);
tv.tv_sec = VRS_TIMEOUT; /* User have to send something in 30 seconds */
tv.tv_usec = 0;
if( (ret = select(io_ctx->sockfd+1, &set, NULL, NULL, &tv)) == -1) {
if(is_log_level(VRS_PRINT_ERROR)) v_print_log(VRS_PRINT_ERROR, "%s:%s():%d select(): %s\n",
__FILE__, __FUNCTION__, __LINE__, strerror(errno));
goto end;
/* Was event on the listen socket */
} else if(ret>0 && FD_ISSET(io_ctx->sockfd, &set)) {
/* Try to receive data through TCP connection */
if( v_tcp_read(io_ctx, &error) <= 0 ) {
goto end;
}
/* Handle verse handshake at TCP connection */
if( (ret = vs_handle_handshake(C)) == -1) {
goto end;
}
/* When there is something to send, then send it to peer */
if( ret == 1 ) {
/* Send response message to the client */
if( (ret = v_tcp_write(io_ctx, &error)) <= 0) {
goto end;
}
}
} else {
if(is_log_level(VRS_PRINT_ERROR)) v_print_log(VRS_PRINT_ERROR, "No response in %d seconds\n", VRS_TIMEOUT);
goto end;
}
}
end:
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: CLOSING\n");
printf("%c[%dm", 27, 0);
}
/* Set up TCP CLOSING state (non-blocking) */
vs_CLOSING(C);
/* Receive and Send messages are not neccessary any more */
if(r_message != NULL) {
free(r_message);
r_message = NULL;
CTX_r_message_set(C, NULL);
}
if(s_message != NULL) {
free(s_message);
s_message = NULL;
CTX_s_message_set(C, NULL);
}
/* TCP connection is considered as CLOSED, but it is not possible to use
* this connection for other client */
stream_conn->host_state = TCP_SERVER_STATE_CLOSED;
/* NULL pointer at stream connection */
CTX_current_stream_conn_set(C, NULL);
/* Set TCP connection to CLOSED */
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: CLOSED\n");
printf("%c[%dm", 27, 0);
}
/* Was udp thread created? */
if(vsession->udp_thread != 0 ) {
/* Wait for UDP thread (this is blocking operation) */
v_print_log(VRS_PRINT_DEBUG_MSG, "Waiting for join with UDP thread ...\n");
if(pthread_join(vsession->udp_thread, &udp_thread_result) != 0) {
v_print_log(VRS_PRINT_DEBUG_MSG, "UDP thread was not joined\n");
}
}
pthread_mutex_lock(&vs_ctx->data.mutex);
/* Unsubscribe this session (this avatar) from all nodes */
vs_node_free_avatar_reference(vs_ctx, vsession);
/* Try to destroy avatar node */
vs_node_destroy_avatar_node(vs_ctx, vsession);
pthread_mutex_unlock(&vs_ctx->data.mutex);
/* This session could be used again for authentication */
stream_conn->host_state = TCP_SERVER_STATE_LISTEN;
/* Clear session flags */
vsession->flags = 0;
if(vsession->peer_cookie.str != NULL) {
free(vsession->peer_cookie.str);
vsession->peer_cookie.str = NULL;
}
if(vsession->ded.str != NULL) {
free(vsession->ded.str);
vsession->ded.str = NULL;
}
if(vsession->client_name != NULL) {
free(vsession->client_name);
vsession->client_name = NULL;
}
if(vsession->client_version != NULL) {
free(vsession->client_version);
vsession->client_version = NULL;
}
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server TCP state: LISTEN\n");
printf("%c[%dm", 27, 0);
}
free(C);
C = NULL;
pthread_exit(NULL);
return NULL;
}
