int vc_REQUEST_handle_packet(struct vContext *C)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VPacket *r_packet = CTX_r_packet(C);
/* Received packet has to have PAY flag (this packet have to be acknowledged),
* ACK flag (acknowledgment of request packet sent to the server) and
* SYN flag (it is handshake packet) */
if(r_packet->header.flags == (PAY_FLAG|ACK_FLAG|SYN_FLAG) &&
/* Does this packet acknowledge right ID? (ACK command has to be first command!) */
r_packet->sys_cmd[0].cmd.id==CMD_ACK_ID &&
r_packet->sys_cmd[0].ack_cmd.pay_id==dgram_conn->host_id)
{
/* Client state */
dgram_conn->host_state = UDP_CLIENT_STATE_PARTOPEN;
/* Save ID of received payload packet */
dgram_conn->peer_id = r_packet->header.payload_id;
/* Call callback functions for system commands */
if(v_conn_dgram_handle_sys_cmds(C, UDP_CLIENT_STATE_REQUEST)!=1) {
v_print_log(VRS_PRINT_WARNING, "Received packet with wrong system command(s)\n");
return RECEIVE_PACKET_CORRUPTED;
}
/* Compute RWIN */
dgram_conn->rwin_peer = r_packet->header.window << dgram_conn->rwin_peer_scale;
}
else {
v_print_log(VRS_PRINT_WARNING, "Packet with corrupted header was dropped.\n");
return RECEIVE_PACKET_CORRUPTED;
}
return RECEIVE_PACKET_SUCCESS;
}
/**
* \brief Check if it is necessary to send acknowledgment packet?
*/
static int check_ack_nak_flag(struct vContext *C)
{
struct VDgramConn *vconn = CTX_current_dgram_conn(C);
struct VPacket *s_packet = CTX_s_packet(C);
struct VPacket *last_r_packet = CTX_r_packet(C);
int ret = 0;
/* Is it necessary to acknowledge payload packet? Several conditions
* has to be accomplished */
/* There has to be some ACK and NAK commands for sending */
if( vconn->ack_nak.count > 0 ) {
if(
/* Piggy packing of AckNak packet to the payload packet */
(s_packet->header.flags & PAY_FLAG)
||
/* Last received packet was payload packet (not only AckNak packet) ... */
(
(last_r_packet->header.flags & PAY_FLAG) &&
(last_r_packet->acked == 0)
)
)
{
last_r_packet->acked = 1;
ret = 1;
}
}
return ret;
}
void vc_destroy_dtls_connection(struct vContext *C)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
int ret;
v_print_log(VRS_PRINT_DEBUG_MSG, "Try to shut down DTLS connection.\n");
again:
ret = SSL_shutdown(dgram_conn->io_ctx.ssl);
if(ret!=1) {
int error = SSL_get_error(dgram_conn->io_ctx.ssl, ret);
switch(error) {
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
goto again;
default:
v_print_log(VRS_PRINT_DEBUG_MSG, "DTLS connection was not able to shut down: %d\n", error);
break;
}
} else {
v_print_log(VRS_PRINT_DEBUG_MSG, "DTLS connection was shut down.\n");
}
SSL_free(dgram_conn->io_ctx.ssl);
dgram_conn->io_ctx.ssl = NULL;
dgram_conn->io_ctx.bio = NULL;
}
/**
* \brief This function check if it is necessary to send payload packet
*/
static int check_pay_flag(struct vContext *C)
{
struct VSession *vsession = CTX_current_session(C);
struct VDgramConn *vconn = CTX_current_dgram_conn(C);
struct timeval tv;
int ret = 0;
/* When there are no payload data to send, then there is possibly need
* for sending keep alive packet. */
if(v_out_queue_get_count(vsession->out_queue) > 0) {
ret = 1;
} else {
long int d_timeout, d_sec_timeout, d_usec_timeout;
/* Get current time */
gettimeofday(&tv, NULL);
/* When was sent last payload packet? */
d_sec_timeout = tv.tv_sec - vconn->tv_pay_send.tv_sec;
d_usec_timeout = tv.tv_usec - vconn->tv_pay_send.tv_usec;
d_timeout = 1000000*d_sec_timeout + d_usec_timeout;
/* Is it necessary to send keep alive packet? */
if(d_timeout > RESEND_TIMEOUT) {
ret = 2;
}
}
return ret;
}
int vc_PARTOPEN_handle_packet(struct vContext *C)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VPacket *r_packet = CTX_r_packet(C);
/* Verse packet header has to include some flags and verse packet has to contain ack command */
if(r_packet->header.flags == (PAY_FLAG|ACK_FLAG|ANK_FLAG) &&
/* Payload ID has to be incremented */
r_packet->header.payload_id == dgram_conn->peer_id+1 &&
/* Does this packet contain ANK ID of last acknowledged Payload ID? */
r_packet->header.ank_id == dgram_conn->peer_id &&
/* Does this packet acknowledge right ID? (ACK command has to be first command!) */
r_packet->sys_cmd[0].cmd.id == CMD_ACK_ID &&
r_packet->sys_cmd[0].ack_cmd.pay_id == dgram_conn->host_id+1 )
{
/* Client state */
dgram_conn->host_state = UDP_CLIENT_STATE_OPEN;
/* Call callback functions for system commands */
if(v_conn_dgram_handle_sys_cmds(C, UDP_CLIENT_STATE_PARTOPEN) != 1) {
v_print_log(VRS_PRINT_WARNING, "Received packet with wrong system command(s)\n");
return RECEIVE_PACKET_CORRUPTED;
}
/* Compute RWIN */
dgram_conn->rwin_peer = r_packet->header.window << dgram_conn->rwin_peer_scale;
} else {
if(is_log_level(VRS_PRINT_WARNING)) v_print_log(VRS_PRINT_WARNING, "Packet with bad header was dropped.\n");
return RECEIVE_PACKET_CORRUPTED;
}
return RECEIVE_PACKET_SUCCESS;
}
int vc_CLOSING_handle_packet(struct vContext *C)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VPacket *r_packet = CTX_r_packet(C);
/* Received packet has to have PAY flag (this packet have to be acknowledged),
* ACK flag (it has to acknowledge close request) and FIN flag (it is
* teardown packet) */
if(r_packet->header.flags == (PAY_FLAG|ACK_FLAG|FIN_FLAG) &&
/* Does this packet acknowledge right ID? (ACK command has to be first command!) */
r_packet->sys_cmd[0].cmd.id==CMD_ACK_ID &&
r_packet->sys_cmd[0].ack_cmd.pay_id==dgram_conn->host_id + dgram_conn->count_s_pay)
{
/* Client state */
dgram_conn->host_state = UDP_CLIENT_STATE_CLOSED;
/* Call callback functions for system commands */
v_conn_dgram_handle_sys_cmds(C, UDP_CLIENT_STATE_CLOSING);
/* Compute RWIN */
dgram_conn->rwin_peer = r_packet->header.window << dgram_conn->rwin_peer_scale;
}
else {
if(is_log_level(VRS_PRINT_WARNING)) v_print_log(VRS_PRINT_WARNING, "Packet with corrupted header was dropped.\n");
return RECEIVE_PACKET_CORRUPTED;
}
return RECEIVE_PACKET_SUCCESS;
}
void vc_REQUEST_init_send_packet(struct vContext *C)
{
struct VC_CTX *vc_ctx = CTX_client_ctx(C);
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VSession *vsession = CTX_current_session(C);
struct VPacket *s_packet = CTX_s_packet(C);
int cmd_rank = 0;
static const uint8 cc_none = CC_NONE,
cmpr_none = CMPR_NONE,
cmpr_addr_share = CMPR_ADDR_SHARE;
/* Verse packet header */
s_packet->header.version = 1;
s_packet->header.flags = PAY_FLAG | SYN_FLAG;
s_packet->header.window = dgram_conn->rwin_host >> dgram_conn->rwin_host_scale;
s_packet->header.payload_id = dgram_conn->host_id;
s_packet->header.ack_nak_id = 0;
s_packet->header.ank_id = 0;
/* System commands */
if(vsession->host_token.str!=NULL) {
/* Add negotiated token */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_TOKEN, vsession->host_token.str, NULL);
}
/* Add CC (local) proposal */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_CC_ID, &cc_none, NULL);
/* Add CC (remote) proposal */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_R_ID, FTR_CC_ID, &cc_none, NULL);
/* Add Scale Window proposal */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_RWIN_SCALE, &vc_ctx->rwin_scale, NULL);
/* Add command compression proposal */
if(vsession->flags & VRS_CMD_CMPR_NONE) {
/* Client doesn't want to send compressed commands (local proposal) */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_CMD_COMPRESS, &cmpr_none, NULL);
/* Client isn't able to receive compressed commands (remote proposal) */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_R_ID, FTR_CMD_COMPRESS, &cmpr_none, NULL);
} else {
/* Client wants to send compressed commands (local proposal) */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_CMD_COMPRESS, &cmpr_addr_share, NULL);
/* Client is able to receive compressed commands (remote proposal) */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_R_ID, FTR_CMD_COMPRESS, &cmpr_addr_share, NULL);
}
}
int vc_CLOSING_loop(struct vContext *C)
{
struct VC_CTX *vc_ctx = CTX_client_ctx(C);
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
int ret;
/* CLOSING 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: CLOSING\n");
printf("%c[%dm", 27, 0);
}
dgram_conn->state[UDP_CLIENT_STATE_CLOSING].attempts = 0;
while(dgram_conn->state[UDP_CLIENT_STATE_CLOSING].attempts < vc_ctx->max_connection_attempts) {
/* Send closing packet */
if( vc_CLOSING_send_packet(C) == SEND_PACKET_ERROR) {
return STATE_EXIT_ERROR;
}
/* Try to receive packet and handle received packet */
ret = vc_receive_and_handle_packet(C, vc_CLOSING_handle_packet);
if(ret == RECEIVE_PACKET_SUCCESS) {
break; /* Break loop and receive to the next state */
} else if(ret == RECEIVE_PACKET_TIMEOUT) {
dgram_conn->state[UDP_CLIENT_STATE_CLOSING].attempts++; /* No packet receive ... try it again */
} else if(ret == RECEIVE_PACKET_CORRUPTED) {
dgram_conn->state[UDP_CLIENT_STATE_CLOSING].attempts++; /* Corrupted packet received ... try it again */
} else if(ret == RECEIVE_PACKET_FAKED) {
continue; /* Packet wasn't received from the server (should not happen, because connect()) */
} else if(ret == RECEIVE_PACKET_ERROR) {
return STATE_EXIT_ERROR;
}
#ifdef WITH_OPENSSL
if(dgram_conn->io_ctx.flags & SOCKET_SECURED) {
/* Did server close DTLS connection? */
if((SSL_get_shutdown(dgram_conn->io_ctx.ssl) & SSL_RECEIVED_SHUTDOWN)) {
return STATE_EXIT_ERROR;
}
}
#endif
}
if(dgram_conn->host_state == UDP_CLIENT_STATE_CLOSING) {
if(is_log_level(VRS_PRINT_ERROR)) v_print_log(VRS_PRINT_ERROR,
"Maximum count of teardown attempts reached %d.\n", vc_ctx->max_connection_attempts);
return STATE_EXIT_ERROR;
}
return STATE_EXIT_SUCCESS;
}
/**
* \brief Call callback functions for all received system commands. Each state
* could have different callback function that is stored in VConnection
* structure.
* \param[in] *C The Verse context;
* \param[in] state_id The id of the current state
* \return The function returns 1, when all system commands were processes
* without problem and it returns 0, when some error occurs.
*/
int v_conn_dgram_handle_sys_cmds(struct vContext *C, const unsigned short state_id)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VPacket *r_packet = CTX_r_packet(C);
int cmd_rank, r, ret = 1;
/* Parse system commands (not ACK and NAK messages ... these are proccessed separately) */
for(cmd_rank=0;
r_packet->sys_cmd[cmd_rank].cmd.id != CMD_RESERVED_ID &&
cmd_rank < MAX_SYSTEM_COMMAND_COUNT;
cmd_rank++)
{
switch (r_packet->sys_cmd[cmd_rank].cmd.id) {
case CMD_ACK_ID:
break;
case CMD_NAK_ID:
break;
case CMD_CHANGE_L_ID:
if(dgram_conn->state[state_id].CHANGE_L_cb) {
r = dgram_conn->state[state_id].CHANGE_L_cb(C, &r_packet->sys_cmd[cmd_rank].cmd);
ret = (ret==0)?0:r;
}
break;
case CMD_CHANGE_R_ID:
if(dgram_conn->state[state_id].CHANGE_R_cb) {
r = dgram_conn->state[state_id].CHANGE_R_cb(C, &r_packet->sys_cmd[cmd_rank].cmd);
ret = (ret==0)?0:r;
}
break;
case CMD_CONFIRM_L_ID:
if(dgram_conn->state[state_id].CONFIRM_L_cb) {
r = dgram_conn->state[state_id].CONFIRM_L_cb(C, &r_packet->sys_cmd[cmd_rank].cmd);
ret = (ret==0)?0:r;
}
break;
case CMD_CONFIRM_R_ID:
if(dgram_conn->state[state_id].CONFIRM_R_cb) {
r = dgram_conn->state[state_id].CONFIRM_R_cb(C, &r_packet->sys_cmd[cmd_rank].cmd);
ret = (ret==0)?0:r;
}
break;
default:
/* Unknown command ID */
if(is_log_level(VRS_PRINT_WARNING)) {
v_print_log(VRS_PRINT_WARNING, "Unknown system command ID: %d\n", r_packet->sys_cmd[cmd_rank].cmd.id);
}
break;
}
}
return ret;
}
int vc_send_packet(struct vContext *C)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VPacket *s_packet = CTX_s_packet(C);
int error_num;
struct timeval tv;
unsigned short buffer_pos = 0;
int ret;
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]);
io_ctx->buf_size = buffer_pos;
/* Send buffer */
ret = v_send_packet(io_ctx, &error_num);
if(ret == SEND_PACKET_SUCCESS) {
/* Update time of sending last packet */
gettimeofday(&tv, NULL);
dgram_conn->tv_pay_send.tv_sec = tv.tv_sec;
dgram_conn->tv_pay_send.tv_usec = tv.tv_usec;
/* Update counter of sent packets */
switch(dgram_conn->host_state) {
case UDP_CLIENT_STATE_REQUEST:
dgram_conn->count_s_pay = 1;
dgram_conn->count_s_ack = 0;
break;
case UDP_CLIENT_STATE_PARTOPEN:
dgram_conn->count_s_pay = 2;
dgram_conn->count_s_ack = 1;
break;
case UDP_CLIENT_STATE_OPEN:
dgram_conn->count_s_pay++;
dgram_conn->count_s_ack++;
break;
case UDP_CLIENT_STATE_CLOSING:
break;
case UDP_CLIENT_STATE_CLOSED:
break;
}
}
return ret;
}
/**
* \brief This function is the callback function for received Change_R
* commands in REQUEST state.
*/
static int vc_REQUEST_CHANGE_R_cb(struct vContext *C, struct Generic_Cmd *cmd)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct Negotiate_Cmd *change_r_cmd = (struct Negotiate_Cmd*)cmd;
int value_rank;
if(change_r_cmd->feature == FTR_FC_ID) {
int ret = 0;
for(value_rank = 0; value_rank < change_r_cmd->count; value_rank++) {
/* Is value in "list" of supported methods */
if(change_r_cmd->value[value_rank].uint8 == FC_NONE ||
change_r_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_r_cmd->value[value_rank].uint8) {
v_print_log(VRS_PRINT_WARNING,
"Skipping proposed remote FC :%d is not the same as proposed local FC: %d\n",
change_r_cmd->value[value_rank].uint8,
dgram_conn->fc_meth);
continue;
}
}
dgram_conn->fc_meth = change_r_cmd->value[value_rank].uint8;
v_print_log(VRS_PRINT_DEBUG_MSG,
"Remote Flow Control ID: %d proposed\n",
change_r_cmd->value[0].uint8);
ret = 1;
break;
} else {
v_print_log(VRS_PRINT_ERROR,
"Skipping unsupported Flow Control method: %d\n",
change_r_cmd->value[value_rank].uint8);
continue;
}
}
return ret;
}
/* Ignore unknown feature */
return 1;
}
void vc_PARTOPEN_init_send_packet(struct vContext *C)
{
struct VSession *vsession = CTX_current_session(C);
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VPacket *s_packet = CTX_s_packet(C);
struct VPacket *r_packet = CTX_r_packet(C);
int cmd_rank = 0;
/* Verse packet header */
s_packet->header.version = 1;
s_packet->header.flags = PAY_FLAG | ACK_FLAG ;
s_packet->header.window = dgram_conn->rwin_host >> dgram_conn->rwin_host_scale;
s_packet->header.payload_id = dgram_conn->host_id + 1;
s_packet->header.ack_nak_id = 0;
if(r_packet->sys_cmd[0].cmd.id == CMD_ACK_ID) {
s_packet->header.flags |= ANK_FLAG;
s_packet->header.ank_id = r_packet->sys_cmd[0].ack_cmd.pay_id;
dgram_conn->ank_id = r_packet->sys_cmd[0].ack_cmd.pay_id;
} else {
s_packet->header.ank_id = 0;
}
/* System commands */
s_packet->sys_cmd[cmd_rank].ack_cmd.id = CMD_ACK_ID;
s_packet->sys_cmd[cmd_rank].ack_cmd.pay_id = dgram_conn->peer_id;
cmd_rank++;
/* Confirm proposed TOKEN */
if(vsession->peer_token.str!=NULL) {
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CONFIRM_L_ID, FTR_TOKEN, vsession->peer_token.str, NULL);
}
/* Confirm proposed Flow Control ID */
if(dgram_conn->fc_meth != FC_RESERVED) {
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CONFIRM_L_ID, FTR_FC_ID, &dgram_conn->fc_meth, NULL);
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CONFIRM_R_ID, FTR_FC_ID, &dgram_conn->fc_meth, NULL);
}
/* Confirm proposed shifting of Flow Control Window */
if(dgram_conn->rwin_peer_scale != 0) {
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CONFIRM_L_ID, FTR_RWIN_SCALE, &dgram_conn->rwin_peer_scale, NULL);
}
}
void vc_CLOSING_init_send_packet(struct vContext *C)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VPacket *s_packet = CTX_s_packet(C);
/* Verse packet header */
s_packet->header.version = 1;
s_packet->header.flags = PAY_FLAG | FIN_FLAG;
s_packet->header.window = dgram_conn->rwin_host >> dgram_conn->rwin_host_scale;
s_packet->header.payload_id = dgram_conn->host_id + dgram_conn->count_s_pay;
s_packet->header.ack_nak_id = dgram_conn->count_s_ack;
s_packet->header.ank_id = 0;
/* System commands */
/* TODO: send ack and nak commands */
s_packet->sys_cmd[0].cmd.id = CMD_RESERVED_ID;
}
void v_print_send_packet(struct vContext *C)
{
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VPacket *s_packet = CTX_s_packet(C);
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 32);
v_print_log(VRS_PRINT_DEBUG_MSG, "Send packet: ");
v_print_log_simple(VRS_PRINT_DEBUG_MSG, "Socket: %d, ", io_ctx->sockfd);
v_print_addr_port(VRS_PRINT_DEBUG_MSG, &io_ctx->peer_addr);
v_print_packet_header(VRS_PRINT_DEBUG_MSG, s_packet);
v_print_log(VRS_PRINT_DEBUG_MSG, "Shift: %d -> Window: %d\n", dgram_conn->rwin_host_scale, (unsigned int)s_packet->header.window << dgram_conn->rwin_host_scale);
v_print_packet_sys_cmds(VRS_PRINT_DEBUG_MSG, s_packet);
printf("%c[%dm", 27, 0);
}
}
/**
* \brief This function set size of congestion window (congestion control)
*/
static void set_host_cwin(struct vContext *C)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
switch(dgram_conn->cc_meth) {
case CC_NONE:
dgram_conn->cwin = 0xFFFF;
break;
case CC_TCP_LIKE:
/* TODO: implement real TCP like congestion control */
dgram_conn->cwin = 0xFFFF;
break;
case CC_RESERVED:
v_print_log(VRS_PRINT_WARNING, "CC_RESERVED should never be used\n");
dgram_conn->cwin = 0xFFFF;
break;
}
}
/**
* \brief This function is the callback function for received Confirm_R
* commands in REQUEST state.
*/
static int vc_REQUEST_CONFIRM_R_cb(struct vContext *C, struct Generic_Cmd *cmd)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct Negotiate_Cmd *confirm_r_cmd = (struct Negotiate_Cmd*)cmd;
/* Server should confirm client proposal of Congestion Control (remote) */
if(confirm_r_cmd->feature == FTR_CC_ID) {
/* TODO: better implementation */
if(confirm_r_cmd->count == 1 && /* Any confirm command has to include only one value */
confirm_r_cmd->value[0].uint8 == CC_NONE) /* "List" of supported methods */
{
v_print_log(VRS_PRINT_DEBUG_MSG, "Remote Congestion Control ID: %d confirmed\n",
confirm_r_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 command compression */
if(confirm_r_cmd->feature == FTR_CMD_COMPRESS) {
if(confirm_r_cmd->count == 1) {
if(confirm_r_cmd->value[0].uint8 == CMPR_NONE ||
confirm_r_cmd->value[0].uint8 == CMPR_ADDR_SHARE)
{
v_print_log(VRS_PRINT_DEBUG_MSG, "Remote Command Compression: %d confirmed\n",
confirm_r_cmd->value[0].uint8);
dgram_conn->peer_cmd_cmpr = confirm_r_cmd->value[0].uint8;
return 1;
} else {
v_print_log(VRS_PRINT_ERROR, "Unsupported Command Compress\n");
return 0;
}
}
}
return 1;
}
/**
* \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 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 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;
}
/* Generic receiving and handling of packet */
int vc_receive_and_handle_packet(struct vContext *C, int handle_packet(struct vContext *C))
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VPacket *r_packet = CTX_r_packet(C);
int ret, error_num;
long int sec = 0, usec = 0;
fd_set set;
struct timeval tv;
/* Initialize set */
FD_ZERO(&set);
FD_SET(dgram_conn->io_ctx.sockfd, &set);
switch(dgram_conn->host_state) {
case UDP_CLIENT_STATE_REQUEST:
case UDP_CLIENT_STATE_PARTOPEN:
case UDP_CLIENT_STATE_CLOSING:
sec = INIT_TIMEOUT + (int) (v_exponential_backoff(dgram_conn->state[dgram_conn->host_state].attempts) * (rand() / (RAND_MAX + 1.0)));
usec = 0;
break;
case UDP_CLIENT_STATE_OPEN:
sec = 0;
usec = 10000;
break;
}
/* Initialize time value */
tv.tv_sec = sec;
tv.tv_usec = usec;
/* Wait on response from server */
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));
return RECEIVE_PACKET_ERROR;
}
/* Check if the event occurred on sockfd */
else if(ret>0 && FD_ISSET(io_ctx->sockfd, &set)) {
/* Try to receive packet from server */
if(v_receive_packet(io_ctx, &error_num) == -1) {
switch(error_num) {
case ECONNREFUSED: /* A remote host refused this connection */
return RECEIVE_PACKET_ERROR;
case EAGAIN:
case EBADF:
case EFAULT:
case EINTR:
case EINVAL:
case ENOMEM:
case ENOTCONN:
case ENOTSOCK:
break;
}
/* Address of received packet has to be same as address of server, when
* connection is not connected */
} else if((io_ctx->flags & SOCKET_CONNECTED) ||
v_compare_addr_and_port(&dgram_conn->peer_address, &dgram_conn->io_ctx.peer_addr))
{
/* The size of buffer must be bigger then zero */
if(dgram_conn->io_ctx.buf_size>0) {
int buffer_pos = 0;
/* Get time of receiving packet */
gettimeofday(&tv, NULL);
/* Extract verse header from packet */
ret = v_unpack_packet_header(io_ctx->buf,
io_ctx->buf_size,
r_packet);
if(ret != VERSE_PACKET_HEADER_SIZE)
return RECEIVE_PACKET_CORRUPTED;
/* Check for right packet header version number */
if(r_packet->header.version != VRS_VERSION) {
if(is_log_level(VRS_PRINT_WARNING)) v_print_log(VRS_PRINT_WARNING, "Packet with unsupported version: %d was dropped.\n",
r_packet->header.version);
return RECEIVE_PACKET_CORRUPTED;
}
/* Compute RWIN */
dgram_conn->rwin_peer = r_packet->header.window << dgram_conn->rwin_peer_scale;
/* Extract system commands from packet */
buffer_pos += v_unpack_packet_system_commands(io_ctx->buf,
io_ctx->buf_size,
r_packet);
/* Are there some node commands in the buffer? */
if(io_ctx->buf_size > buffer_pos) {
/* Set pointer to not proceeded buffer */
r_packet->data = (uint8*)&io_ctx->buf[buffer_pos];
/* Set size of not proceeded buffer */
r_packet->data_size = io_ctx->buf_size - buffer_pos;
} else {
r_packet->data = NULL;
r_packet->data_size = 0;
}
/* When important things are done, then print content of the
* command (in debug mode) */
v_print_receive_packet(C);
/* Handle received packet and its data */
ret = handle_packet(C);
if(ret == RECEIVE_PACKET_SUCCESS) {
/* Update information about last received packet payload
* packet */
if(r_packet->header.flags & PAY_FLAG) {
dgram_conn->last_r_pay = r_packet->header.payload_id;
/* Update time of last received payload packet */
dgram_conn->tv_pay_recv.tv_sec = tv.tv_sec;
dgram_conn->tv_pay_recv.tv_usec = tv.tv_usec;
}
/* Update information about last received packet acknowledgment
* packet */
if(r_packet->header.flags & ACK_FLAG) {
dgram_conn->last_r_ack = r_packet->header.ack_nak_id;
}
}
return ret;
} else {
if(is_log_level(VRS_PRINT_WARNING)) v_print_log(VRS_PRINT_WARNING, "Packet with zero size was dropped.\n");
return RECEIVE_PACKET_CORRUPTED;
}
} else {
/* When some 'bad' packet is received on this port, then do not increase counter
* of connection attempts (packet was received from address, that does not belong
* to the server) */
if(is_log_level(VRS_PRINT_WARNING))
v_print_log(VRS_PRINT_WARNING, "Packet from unknown address was dropped.\n");
return RECEIVE_PACKET_FAKED; /* This should not happen, because connect() function is used */
}
}
return RECEIVE_PACKET_TIMEOUT;
}
/**
* \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 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 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;
}
int vc_OPEN_loop(struct vContext *C)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VPacket *r_packet = CTX_r_packet(C);
struct Ack_Nak_Cmd ack_cmd;
int ret;
/* OPEN 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: OPEN\n");
printf("%c[%dm", 27, 0);
}
/* Add ACK command to the list of ACK NAK commands to be send to the peer */
ack_cmd.id = CMD_ACK_ID;
ack_cmd.pay_id = r_packet->header.payload_id;
v_ack_nak_history_add_cmd(&dgram_conn->ack_nak, &ack_cmd);
/* Receiving of last packet in previous packet had to be successful, because
* client is in this state now :-). */
ret = RECEIVE_PACKET_SUCCESS;
while(dgram_conn->host_state == UDP_CLIENT_STATE_OPEN) {
dgram_conn->state[UDP_CLIENT_STATE_OPEN].attempts++;
/* Send payload data or keep-alive packet */
if( vc_OPEN_send_packet(C) == SEND_PACKET_ERROR ) {
return STATE_EXIT_ERROR;
}
/* Try to receive packet and handle received packet */
ret = vc_receive_and_handle_packet(C, vc_OPEN_handle_packet);
if(ret == RECEIVE_PACKET_SUCCESS) {
continue;
} else if(ret == RECEIVE_PACKET_TIMEOUT) {
struct timeval tv;
gettimeofday(&tv, NULL);
/* When no valid packet received from server for defined time, then consider this
* connection as dead and return error */
if((tv.tv_sec - dgram_conn->tv_pay_recv.tv_sec) >= VRS_TIMEOUT) {
return STATE_EXIT_ERROR;
} else {
continue;
}
} else if(ret == RECEIVE_PACKET_CORRUPTED) {
continue;
} else if(ret == RECEIVE_PACKET_FAKED) {
return STATE_EXIT_ERROR;
} else if(ret == RECEIVE_PACKET_ERROR) {
return STATE_EXIT_ERROR;
}
#ifdef WITH_OPENSSL
if(dgram_conn->io_ctx.flags & SOCKET_SECURED) {
/* Did server close DTLS connection? */
if((SSL_get_shutdown(dgram_conn->io_ctx.ssl) & SSL_RECEIVED_SHUTDOWN)) {
return STATE_EXIT_ERROR;
}
}
#endif
}
return STATE_EXIT_SUCCESS;
}
/**
* \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;
}
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;
}
int vc_REQUEST_loop(struct vContext *C)
{
struct VC_CTX *vc_ctx = CTX_client_ctx(C);
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
int ret;
/* REQUEST 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: REQUEST\n");
printf("%c[%dm", 27, 0);
}
/* State of client */
dgram_conn->host_state = UDP_CLIENT_STATE_REQUEST;
/* Initialize callback functions for this state */
dgram_conn->state[UDP_CLIENT_STATE_REQUEST].CHANGE_L_cb = vc_REQUEST_CHANGE_L_cb;
dgram_conn->state[UDP_CLIENT_STATE_REQUEST].CHANGE_R_cb = vc_REQUEST_CHANGE_R_cb;
dgram_conn->state[UDP_CLIENT_STATE_REQUEST].CONFIRM_L_cb = vc_REQUEST_CONFIRM_L_cb;
dgram_conn->state[UDP_CLIENT_STATE_REQUEST].CONFIRM_R_cb = vc_REQUEST_CONFIRM_R_cb;
dgram_conn->state[UDP_CLIENT_STATE_REQUEST].attempts = 0;
while(dgram_conn->state[UDP_CLIENT_STATE_REQUEST].attempts < vc_ctx->max_connection_attempts) {
/* Try to send a packet with connect request */
if( vc_REQUEST_send_packet(C) == SEND_PACKET_ERROR) {
return STATE_EXIT_ERROR;
}
/* Try to receive packet and handle received packet (update client state) */
ret = vc_receive_and_handle_packet(C, vc_REQUEST_handle_packet);
if(ret == RECEIVE_PACKET_SUCCESS) {
break; /* Break loop and receive to the next state */
} else if(ret == RECEIVE_PACKET_TIMEOUT) {
dgram_conn->state[UDP_CLIENT_STATE_REQUEST].attempts++; /* No packet receive ... try it again */
} else if(ret == RECEIVE_PACKET_CORRUPTED) {
dgram_conn->state[UDP_CLIENT_STATE_REQUEST].attempts++; /* Corrupted packet received ... try it again */
} else if(ret == RECEIVE_PACKET_FAKED) {
continue; /* Packet wasn't received from the server (should not happen, because connect()) */
} else if(ret == RECEIVE_PACKET_ERROR) {
return STATE_EXIT_ERROR;
}
#ifdef WITH_OPENSSL
if(dgram_conn->io_ctx.flags & SOCKET_SECURED) {
/* Did server close DTLS connection? */
if((SSL_get_shutdown(dgram_conn->io_ctx.ssl) & SSL_RECEIVED_SHUTDOWN)) {
return STATE_EXIT_ERROR;
}
}
#endif
}
/* Maximal count of connection attempts reached and the client is
* still in REQUEST state -> end handshake. */
if(dgram_conn->host_state == UDP_CLIENT_STATE_REQUEST) {
if(is_log_level(VRS_PRINT_ERROR)) v_print_log(VRS_PRINT_ERROR,
"Maximum count of connection attempts reached %d.\n", vc_ctx->max_connection_attempts);
return STATE_EXIT_ERROR;
}
return STATE_EXIT_SUCCESS;
}
/**
* \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;
}