static void TCPIP_SMTP_ClientProcess(void)
{
uint8_t i;
uint16_t w;
uint8_t vBase64Buffer[4];
static uint32_t SMTPTimer;
static uint8_t RXBuffer[4];
static const uint8_t *ROMStrPtr, *ROMStrPtr2;
static const uint8_t *RAMStrPtr;
static uint16_t wAddressLength;
TCPIP_DNS_RESULT dnsRes;
DNS_RESOLVE_TYPE dnsType;
switch(TransportState)
{
case TRANSPORT_HOME:
// TCPIP_SMTP_UsageBegin() is the only function which will kick
// the state machine into the next state
break;
case TRANSPORT_BEGIN:
// Wait for the user to program all the pointers and then
// call TCPIP_SMTP_MailSend()
if(!SMTPFlags.bits.ReadyToStart)
{
break;
}
SMTPClient.Server = FindEmailServer(&SMTPClient, &dnsType);
// See if we found a hostname anywhere which we could resolve
if(!(SMTPClient.Server))
{
ResponseCode = SMTP_RESOLVE_ERROR;
TransportState = TRANSPORT_HOME;
break;
}
// check for a plain IP address
if(TCPIP_Helper_StringToIPAddress(SMTPClient.Server, &SMTPServer))
{
TransportState = TRANSPORT_OBTAIN_SOCKET;
break;
}
// use DNS to resolve the name
TCPIP_DNS_Resolve(SMTPClient.Server, dnsType);
SMTPTimer = SYS_TMR_TickCountGet();
TransportState++;
break;
case TRANSPORT_NAME_RESOLVE:
// Wait for the DNS server to return the requested IP address
dnsRes = TCPIP_DNS_IsResolved((const char*)SMTPClient.Server,&SMTPServer);
if(dnsRes == DNS_RES_PENDING)
{
break;
}
if(dnsRes < 0)
{ // some error occurred
ResponseCode = SMTP_RESOLVE_ERROR;
TransportState = TRANSPORT_HOME;
break;
}
// DNS_RES_OK
TransportState++;
// No need to break here
case TRANSPORT_OBTAIN_SOCKET:
// Connect a TCP socket to the remote SMTP server
MySocket = TCPIP_TCP_ClientOpen(IP_ADDRESS_TYPE_IPV4, SMTPClient.ServerPort, (IP_MULTI_ADDRESS*)&SMTPServer.Val);
// Abort operation if no TCP socket could be opened.
// If this ever happens, you need to update your tcp_config.h
if(MySocket == INVALID_SOCKET)
break;
TCPIP_TCP_SignalHandlerRegister(MySocket, TCPIP_TCP_SIGNAL_RX_DATA, _SMTPSocketRxSignalHandler, 0);
TransportState++;
SMTPTimer = SYS_TMR_TickCountGet();
// No break; fall into TRANSPORT_SOCKET_OBTAINED
case TRANSPORT_SOCKET_OBTAINED:
if(!TCPIP_TCP_IsConnected(MySocket))
{
// Don't stick around in the wrong state if the
// server was connected, but then disconnected us.
// Also time out if we can't establish the connection
// to the SMTP server
if(SMTPFlags.bits.ConnectedOnce || ((SYS_TMR_TickCountGet()-SMTPTimer) > (TCPIP_SMTP_SERVER_REPLY_TIMEOUT * SYS_TMR_TickCounterFrequencyGet())))
{
ResponseCode = SMTP_CONNECT_ERROR;
TransportState = TRANSPORT_CLOSE;
}
break;
}
SMTPFlags.bits.ConnectedOnce = true;
// See if the server sent us anything
while(TCPIP_TCP_GetIsReady(MySocket))
{
TCPIP_TCP_Get(MySocket, &i);
switch(RXParserState)
{
case RX_BYTE_0:
case RX_BYTE_1:
case RX_BYTE_2:
RXBuffer[RXParserState] = i;
RXParserState++;
break;
case RX_BYTE_3:
switch(i)
{
case ' ':
SMTPFlags.bits.RXSkipResponse = false;
RXParserState++;
break;
case '-':
SMTPFlags.bits.RXSkipResponse = true;
RXParserState++;
break;
case '\r':
RXParserState = RX_SEEK_LF;
break;
}
break;
case RX_SEEK_CR:
if(i == '\r')
RXParserState++;
break;
case RX_SEEK_LF:
// If we received the whole command
if(i == '\n')
{
RXParserState = RX_BYTE_0;
if(!SMTPFlags.bits.RXSkipResponse)
{
// The server sent us a response code
// Null terminate the ASCII reponse code so we can convert it to an integer
RXBuffer[3] = 0;
ResponseCode = atoi((char*)RXBuffer);
// Handle the response
switch(SMTPState)
{
case SMTP_HELO_ACK:
if(ResponseCode >= 200u && ResponseCode <= 299u)
{
if(SMTPClient.Username)
SMTPState = SMTP_AUTH_LOGIN;
else
SMTPState = SMTP_MAILFROM;
}
else
SMTPState = SMTP_QUIT_INIT;
break;
case SMTP_AUTH_LOGIN_ACK:
case SMTP_AUTH_USERNAME_ACK:
if(ResponseCode == 334u)
SMTPState++;
else
SMTPState = SMTP_QUIT_INIT;
break;
case SMTP_AUTH_PASSWORD_ACK:
if(ResponseCode == 235u)
SMTPState++;
else
SMTPState = SMTP_QUIT_INIT;
break;
case SMTP_HOME:
case SMTP_MAILFROM_ACK:
case SMTP_RCPTTO_ACK:
case SMTP_RCPTTOCC_ACK:
case SMTP_RCPTTOBCC_ACK:
if(ResponseCode >= 200u && ResponseCode <= 299u)
SMTPState++;
else
SMTPState = SMTP_QUIT_INIT;
break;
case SMTP_DATA_ACK:
if(ResponseCode == 354u)
SMTPState++;
else
SMTPState = SMTP_QUIT_INIT;
break;
case SMTP_DATA_BODY_ACK:
if(ResponseCode >= 200u && ResponseCode <= 299u)
SMTPFlags.bits.SentSuccessfully = true;
SMTPState = SMTP_QUIT_INIT;
break;
// Default case needed to supress compiler diagnostics
default:
break;
}
}
}
else if(i != '\r')
RXParserState--;
break;
}
}
// Generate new data in the TX buffer, as needed, if possible
if(TCPIP_TCP_PutIsReady(MySocket) < 64u)
break;
switch(SMTPState)
{
case SMTP_HELO:
if(SMTPClient.Username == NULL)
TCPIP_TCP_StringPut(MySocket, (uint8_t*)"HELO MCHPBOARD\r\n");
else
TCPIP_TCP_StringPut(MySocket, (uint8_t*)"EHLO MCHPBOARD\r\n");
TCPIP_TCP_Flush(MySocket);
SMTPState++;
break;
case SMTP_AUTH_LOGIN:
// Note: This state is only entered from SMTP_HELO_ACK if the application
// has specified a Username to use (SMTPClient.Username is non-NULL)
TCPIP_TCP_StringPut(MySocket, (uint8_t*)"AUTH LOGIN\r\n");
TCPIP_TCP_Flush(MySocket);
SMTPState++;
break;
case SMTP_AUTH_USERNAME:
// Base 64 encode and transmit the username.
RAMStrPtr = (uint8_t*)SMTPClient.Username;
w = strlen((char*)RAMStrPtr);
while(w)
{
i = 0;
while((i < w) && (i < sizeof(vBase64Buffer)*3/4))
{
vBase64Buffer[i] = *RAMStrPtr++;
i++;
}
w -= i;
TCPIP_Helper_Base64Encode(vBase64Buffer, i, vBase64Buffer, sizeof(vBase64Buffer));
TCPIP_TCP_ArrayPut(MySocket, vBase64Buffer, sizeof(vBase64Buffer));
}
TCPIP_TCP_StringPut(MySocket, (uint8_t*)"\r\n");
TCPIP_TCP_Flush(MySocket);
SMTPState++;
break;
case SMTP_AUTH_PASSWORD:
// Base 64 encode and transmit the password
RAMStrPtr = (uint8_t*)SMTPClient.Password;
w = strlen((char*)RAMStrPtr);
while(w)
{
i = 0;
while((i < w) && (i < sizeof(vBase64Buffer)*3/4))
{
vBase64Buffer[i] = *RAMStrPtr++;
i++;
}
w -= i;
TCPIP_Helper_Base64Encode(vBase64Buffer, i, vBase64Buffer, sizeof(vBase64Buffer));
TCPIP_TCP_ArrayPut(MySocket, vBase64Buffer, sizeof(vBase64Buffer));
}
TCPIP_TCP_StringPut(MySocket, (uint8_t*)"\r\n");
TCPIP_TCP_Flush(MySocket);
SMTPState++;
break;
case SMTP_MAILFROM:
// Send MAIL FROM header. Note that this is for the SMTP server validation,
// not what actually will be displayed in the recipients mail client as a
// return address.
TCPIP_TCP_StringPut(MySocket, (uint8_t*)"MAIL FROM:<");
RAMStrPtr = FindEmailAddress((uint8_t*)SMTPClient.From, &wAddressLength);
TCPIP_TCP_ArrayPut(MySocket, RAMStrPtr, wAddressLength);
TCPIP_TCP_StringPut(MySocket, (uint8_t*)">\r\n");
TCPIP_TCP_Flush(MySocket);
SMTPState++;
break;
case SMTP_RCPTTO_INIT:
// See if there are any (To) recipients to process
if(SMTPClient.To)
{
RAMStrPtr = FindEmailAddress((uint8_t*)SMTPClient.To, &wAddressLength);
if(wAddressLength)
{
SMTPState = SMTP_RCPTTO;
break;
}
}
SMTPState = SMTP_RCPTTOCC_INIT;
break;
case SMTP_RCPTTO:
case SMTP_RCPTTOCC:
case SMTP_RCPTTOBCC:
TCPIP_TCP_StringPut(MySocket, (uint8_t*)"RCPT TO:<");
TCPIP_TCP_ArrayPut(MySocket, RAMStrPtr, wAddressLength);
TCPIP_TCP_StringPut(MySocket, (uint8_t*)">\r\n");
TCPIP_TCP_Flush(MySocket);
SMTPState++;
break;
case SMTP_RCPTTO_ISDONE:
// See if we have any more (To) recipients to process
// If we do, we must roll back a couple of states
RAMStrPtr = FindEmailAddress(RAMStrPtr+wAddressLength, &wAddressLength);
if(wAddressLength)
{
SMTPState = SMTP_RCPTTO;
break;
}
// All done with To field
SMTPState++;
//No break
case SMTP_RCPTTOCC_INIT:
// See if there are any Carbon Copy (CC) recipients to process
if(SMTPClient.CC)
{
RAMStrPtr = FindEmailAddress((uint8_t*)SMTPClient.CC, &wAddressLength);
if(wAddressLength)
{
SMTPState = SMTP_RCPTTOCC;
break;
}
}
SMTPState = SMTP_RCPTTOBCC_INIT;
break;
case SMTP_RCPTTOCC_ISDONE:
// See if we have any more Carbon Copy (CC) recipients to process
// If we do, we must roll back a couple of states
RAMStrPtr = FindEmailAddress(RAMStrPtr+wAddressLength, &wAddressLength);
if(wAddressLength)
{
SMTPState = SMTP_RCPTTOCC;
break;
}
// All done with CC field
SMTPState++;
//No break
case SMTP_RCPTTOBCC_INIT:
// See if there are any Blind Carbon Copy (BCC) recipients to process
if(SMTPClient.BCC)
{
RAMStrPtr = FindEmailAddress((uint8_t*)SMTPClient.BCC, &wAddressLength);
if(wAddressLength)
{
SMTPState = SMTP_RCPTTOBCC;
break;
}
}
// All done with BCC field
SMTPState = SMTP_DATA;
break;
case SMTP_RCPTTOBCC_ISDONE:
// See if we have any more Blind Carbon Copy (CC) recipients to process
// If we do, we must roll back a couple of states
RAMStrPtr = FindEmailAddress(RAMStrPtr+wAddressLength, &wAddressLength);
if(wAddressLength)
{
SMTPState = SMTP_RCPTTOBCC;
break;
}
// All done with BCC field
SMTPState++;
//No break
case SMTP_DATA:
TCPIP_TCP_StringPut(MySocket, (uint8_t*)"DATA\r\n");
SMTPState++;
PutHeadersState = PUTHEADERS_FROM_INIT;
TCPIP_TCP_Flush(MySocket);
break;
case SMTP_DATA_HEADER:
while((PutHeadersState != PUTHEADERS_DONE) && (TCPIP_TCP_PutIsReady(MySocket) > 64u))
{
switch(PutHeadersState)
{
case PUTHEADERS_FROM_INIT:
if(SMTPClient.From)
{
PutHeadersState = PUTHEADERS_FROM;
TCPIP_TCP_StringPut(MySocket, (uint8_t*)"From: ");
}
else
{
PutHeadersState = PUTHEADERS_TO_INIT;
}
break;
case PUTHEADERS_FROM:
SMTPClient.From = (char*)TCPIP_TCP_StringPut(MySocket, (uint8_t*)SMTPClient.From);
if(*SMTPClient.From == 0u)
PutHeadersState = PUTHEADERS_TO_INIT;
break;
case PUTHEADERS_TO_INIT:
if(SMTPClient.To)
{
PutHeadersState = PUTHEADERS_TO;
TCPIP_TCP_StringPut(MySocket, (uint8_t*)"\r\nTo: ");
}
else
{
PutHeadersState = PUTHEADERS_CC_INIT;
}
break;
case PUTHEADERS_TO:
SMTPClient.To = (char*)TCPIP_TCP_StringPut(MySocket, (uint8_t*)SMTPClient.To);
if(*SMTPClient.To == 0u)
PutHeadersState = PUTHEADERS_CC_INIT;
break;
case PUTHEADERS_CC_INIT:
if(SMTPClient.CC)
{
PutHeadersState = PUTHEADERS_CC;
TCPIP_TCP_StringPut(MySocket, (uint8_t*)"\r\nCC: ");
}
else
{
PutHeadersState = PUTHEADERS_SUBJECT_INIT;
}
break;
case PUTHEADERS_CC:
SMTPClient.CC = (char*)TCPIP_TCP_StringPut(MySocket, (uint8_t*)SMTPClient.CC);
if(*SMTPClient.CC == 0u)
PutHeadersState = PUTHEADERS_SUBJECT_INIT;
break;
case PUTHEADERS_SUBJECT_INIT:
if(SMTPClient.Subject)
{
PutHeadersState = PUTHEADERS_SUBJECT;
TCPIP_TCP_StringPut(MySocket, (uint8_t*)"\r\nSubject: ");
}
else
{
PutHeadersState = PUTHEADERS_OTHER_INIT;
}
break;
case PUTHEADERS_SUBJECT:
SMTPClient.Subject = (char*)TCPIP_TCP_StringPut(MySocket, (uint8_t*)SMTPClient.Subject);
if(*SMTPClient.Subject == 0u)
PutHeadersState = PUTHEADERS_OTHER_INIT;
break;
case PUTHEADERS_OTHER_INIT:
TCPIP_TCP_ArrayPut(MySocket, (uint8_t*)"\r\n", 2);
if(SMTPClient.OtherHeaders)
{
PutHeadersState = PUTHEADERS_OTHER;
}
else
{
TCPIP_TCP_ArrayPut(MySocket, (uint8_t*)"\r\n", 2);
PutHeadersState = PUTHEADERS_DONE;
SMTPState++;
}
break;
case PUTHEADERS_OTHER:
SMTPClient.OtherHeaders = (char*)TCPIP_TCP_StringPut(MySocket, (uint8_t*)SMTPClient.OtherHeaders);
if(*SMTPClient.OtherHeaders == 0u)
{
TCPIP_TCP_ArrayPut(MySocket, (uint8_t*)"\r\n", 2);
PutHeadersState = PUTHEADERS_DONE;
SMTPState++;
}
break;
// Default case needed to supress compiler diagnostics
default:
break;
}
}
TCPIP_TCP_Flush(MySocket);
break;
case SMTP_DATA_BODY_INIT:
SMTPState++;
RAMStrPtr = (uint8_t*)SMTPClient.Body;
ROMStrPtr2 = (const uint8_t*)"\r\n.\r\n";
CRPeriod.Pos = NULL;
if(RAMStrPtr)
CRPeriod.Pos = (uint8_t*)strstr((char*)RAMStrPtr, (const char*)"\r\n.");
// No break here
case SMTP_DATA_BODY:
if(SMTPClient.Body)
{
if(*ROMStrPtr2)
{
// Put the application data, doing the transparancy replacement of "\r\n." with "\r\n.."
while(CRPeriod.Pos)
{
CRPeriod.Pos += 3;
RAMStrPtr += TCPIP_TCP_ArrayPut(MySocket, RAMStrPtr, CRPeriod.Pos-RAMStrPtr);
if(RAMStrPtr == CRPeriod.Pos)
{
if(!TCPIP_TCP_Put(MySocket, '.'))
{
CRPeriod.Pos -= 3;
break;
}
}
else
{
CRPeriod.Pos -= 3;
break;
}
CRPeriod.Pos = (uint8_t*)strstr((char*)RAMStrPtr, (const char*)"\r\n.");
}
// If we get down here, either all replacements have been made or there is no remaining space in the TCP output buffer
RAMStrPtr = TCPIP_TCP_StringPut(MySocket, RAMStrPtr);
ROMStrPtr2 = TCPIP_TCP_StringPut(MySocket, (uint8_t*)ROMStrPtr2);
TCPIP_TCP_Flush(MySocket);
}
}
else
{
if(SMTPFlags.bits.ReadyToFinish)
{
if(*ROMStrPtr2)
{
ROMStrPtr2 = TCPIP_TCP_StringPut(MySocket, (uint8_t*)ROMStrPtr2);
TCPIP_TCP_Flush(MySocket);
}
}
}
if(*ROMStrPtr2 == 0u)
{
SMTPState++;
}
break;
case SMTP_QUIT_INIT:
SMTPState++;
ROMStrPtr = (const uint8_t*)"QUIT\r\n";
// No break here
case SMTP_QUIT:
if(*ROMStrPtr)
{
ROMStrPtr = TCPIP_TCP_StringPut(MySocket, (uint8_t*)ROMStrPtr);
TCPIP_TCP_Flush(MySocket);
}
if(*ROMStrPtr == 0u)
{
TransportState = TRANSPORT_CLOSE;
}
break;
// Default case needed to supress compiler diagnostics
default:
break;
}
break;
case TRANSPORT_CLOSE:
// Close the socket so it can be used by other modules
TCPIP_TCP_Close(MySocket);
MySocket = INVALID_SOCKET;
// Go back to doing nothing
TransportState = TRANSPORT_HOME;
break;
}
}
void APP_Tasks( void )
{
static IPV4_ADDR dwLastIP[2] = { {-1}, {-1} };
IPV4_ADDR ipAddr;
int i;
switch(appData.state)
{
case APP_TCPIP_WAIT_FOR_IP:
// if the IP address of an interface has changed
// display the new value on the system console
nNets = TCPIP_STACK_NumberOfNetworksGet();
for (i = 0; i < nNets; i++)
{
netH = TCPIP_STACK_IndexToNet(i);
ipAddr.Val = TCPIP_STACK_NetAddress(netH);
if(dwLastIP[i].Val != ipAddr.Val)
{
dwLastIP[i].Val = ipAddr.Val;
SYS_CONSOLE_MESSAGE(TCPIP_STACK_NetNameGet(netH));
SYS_CONSOLE_MESSAGE(" IP Address: ");
SYS_CONSOLE_PRINT("%d.%d.%d.%d \r\n", ipAddr.v[0], ipAddr.v[1], ipAddr.v[2], ipAddr.v[3]);
if (ipAddr.v[0] != 0 && ipAddr.v[0] != 169) // Wait for a Valid IP
{
appData.state = APP_TCPIP_OPENING_SERVER;
}
}
}
break;
case APP_TCPIP_OPENING_SERVER:
{
SYS_CONSOLE_PRINT("Waiting for Client Connection on port: %d\r\n", SERVER_PORT);
appData.socket = TCPIP_TCP_ServerOpen(IP_ADDRESS_TYPE_IPV4, SERVER_PORT, 0);
if (appData.socket == INVALID_SOCKET)
{
SYS_CONSOLE_MESSAGE("Couldn't open server socket\r\n");
break;
}
appData.state = APP_TCPIP_WAIT_FOR_CONNECTION;
}
break;
case APP_TCPIP_WAIT_FOR_CONNECTION:
{
if (!TCPIP_TCP_IsConnected(appData.socket))
{
return;
}
else
{
// We got a connection
appData.state = APP_TCPIP_SERVING_CONNECTION;
SYS_CONSOLE_MESSAGE("Received a connection\r\n");
}
}
break;
case APP_TCPIP_SERVING_CONNECTION:
{
if (!TCPIP_TCP_IsConnected(appData.socket))
{
appData.state = APP_TCPIP_CLOSING_CONNECTION;
SYS_CONSOLE_MESSAGE("Connection was closed\r\n");
break;
}
int16_t wMaxGet, wMaxPut, wCurrentChunk;
uint16_t w, w2;
uint8_t AppBuffer[32];
// Figure out how many bytes have been received and how many we can transmit.
wMaxGet = TCPIP_TCP_GetIsReady(appData.socket); // Get TCP RX FIFO byte count
wMaxPut = TCPIP_TCP_PutIsReady(appData.socket); // Get TCP TX FIFO free space
// Make sure we don't take more bytes out of the RX FIFO than we can put into the TX FIFO
if(wMaxPut < wMaxGet)
wMaxGet = wMaxPut;
// Process all bytes that we can
// This is implemented as a loop, processing up to sizeof(AppBuffer) bytes at a time.
// This limits memory usage while maximizing performance. Single byte Gets and Puts are a lot slower than multibyte GetArrays and PutArrays.
wCurrentChunk = sizeof(AppBuffer);
for(w = 0; w < wMaxGet; w += sizeof(AppBuffer))
{
// Make sure the last chunk, which will likely be smaller than sizeof(AppBuffer), is treated correctly.
if(w + sizeof(AppBuffer) > wMaxGet)
wCurrentChunk = wMaxGet - w;
// Transfer the data out of the TCP RX FIFO and into our local processing buffer.
TCPIP_TCP_ArrayGet(appData.socket, AppBuffer, wCurrentChunk);
// Perform the "ToUpper" operation on each data byte
for(w2 = 0; w2 < wCurrentChunk; w2++)
{
i = AppBuffer[w2];
if(i >= 'a' && i <= 'z')
{
i -= ('a' - 'A');
AppBuffer[w2] = i;
}
else if(i == '\e') //escape
{
appData.state = APP_TCPIP_CLOSING_CONNECTION;
SYS_CONSOLE_MESSAGE("Connection was closed\r\n");
}
}
// Transfer the data out of our local processing buffer and into the TCP TX FIFO.
TCPIP_TCP_ArrayPut(appData.socket, AppBuffer, wCurrentChunk);
// No need to perform any flush. TCP data in TX FIFO will automatically transmit itself after it accumulates for a while. If you want to decrease latency (at the expense of wasting network bandwidth on TCP overhead), perform and explicit flush via the TCPFlush() API.
}
}
break;
case APP_TCPIP_CLOSING_CONNECTION:
{
// Close the socket connection.
TCPIP_TCP_Close(appData.socket);
appData.state = APP_TCPIP_OPENING_SERVER;
}
break;
default:
break;
}
}
// ddns_manager.h
void TCPIP_DDNS_Task(void)
{
uint8_t i;
uint16_t wPos;
DNS_RESULT dnsRes;
static enum
{
SM_IDLE = 0u,
SM_BEGIN_CHECKIP,
SM_DNS_START_RESOLVE,
SM_DNS_WAIT_RESOLVE,
SM_CHECKIP_SKT_OBTAINED,
SM_CHECKIP_FIND_DELIMITER,
SM_CHECKIP_FIND_ADDRESS,
SM_CHECKIP_DISCONNECT,
SM_IP_UPDATE_HOME,
SM_IP_UPDATE_WAIT_DNS,
SM_IP_UPDATE_SKT_OBTAINED,
/*
HTTP request msg is divided into 6 parts
SM_IP_UPDATE_REQ_A,B,C,D,E,F as the tcp ip tx
buffer is only able to carry 200 bytes at a time.
*/
SM_IP_UPDATE_REQ_A, //0x8
SM_IP_UPDATE_REQ_B, //0x9
SM_IP_UPDATE_REQ_C, //0xa
SM_IP_UPDATE_REQ_D, //0xb
SM_IP_UPDATE_REQ_E, //0xc
SM_IP_UPDATE_REQ_F, //0xd
SM_IPUPDATE_FIND_RESPONSE, //0xe
SM_IPUPDATE_PARSE_RESPONSE, //0xf
SM_IPUDATE_DISCONNECT, //0x10
SM_DONE, // Done, try again in 10 minutes
SM_DNS_ERROR, // DNS resolver error, try again in 30 seconds
SM_SKT_ERROR, // socket open error, try again in 30 seconds
SM_SOFT_ERROR, // Soft error, try again in 30 seconds
SM_SYSTEM_ERROR // System error, try again in 30 minutes
} smDDNS = SM_IDLE;
switch(smDDNS)
{
case SM_IDLE:
// Wait for timeout to begin IP check
if(SYS_TICK_Get() > dwUpdateAt)
break;
// Otherwise, continue to next state
smDDNS = SM_BEGIN_CHECKIP;
case SM_BEGIN_CHECKIP:
// If a fatal error has occurred, abort to the SM_DONE state and keep
// the error message.
if(lastStatus >= DDNS_STATUS_ABUSE && lastStatus <= DDNS_STATUS_911)
{
smDDNS = SM_DONE;
break;
}
// If DDNSClient is not properly configured, abort
if(
// Verify that each pointer is not null, and is not empty
(DDNSClient.ROMPointers.Host && (!DDNSClient.Host.szROM || *DDNSClient.Host.szROM == '\0') ) ||
(!DDNSClient.ROMPointers.Host && (!DDNSClient.Host.szRAM || *DDNSClient.Host.szRAM == '\0') ) ||
(DDNSClient.ROMPointers.Username && (!DDNSClient.Username.szROM || *DDNSClient.Username.szROM == '\0') ) ||
(!DDNSClient.ROMPointers.Username && (!DDNSClient.Username.szRAM || *DDNSClient.Username.szRAM == '\0') ) ||
(DDNSClient.ROMPointers.Password && (!DDNSClient.Password.szROM || *DDNSClient.Password.szROM == '\0') ) ||
(!DDNSClient.ROMPointers.Password && (!DDNSClient.Password.szRAM || *DDNSClient.Password.szRAM == '\0') ) ||
(DDNSClient.ROMPointers.CheckIPServer && (!DDNSClient.CheckIPServer.szROM || *DDNSClient.CheckIPServer.szROM == '\0') ) ||
(!DDNSClient.ROMPointers.CheckIPServer && (!DDNSClient.CheckIPServer.szRAM || *DDNSClient.CheckIPServer.szRAM == '\0') ) ||
(DDNSClient.ROMPointers.UpdateServer && (!DDNSClient.UpdateServer.szROM || *DDNSClient.UpdateServer.szROM == '\0') ) ||
(!DDNSClient.ROMPointers.UpdateServer && (!DDNSClient.UpdateServer.szRAM || *DDNSClient.UpdateServer.szRAM == '\0') )
)
{
smDDNS = SM_SOFT_ERROR;
lastStatus = DDNS_STATUS_INVALID;
break;
}
// Start with an invalidated IP String
vBuffer[0] = '\0';
smDDNS++;
break;
case SM_DNS_START_RESOLVE:
netH = TCPIP_STACK_NetDefaultGet();
if(TCPIP_DNS_UsageBegin(netH) != DNS_RES_OK)
{
lastStatus = DDNS_STATUS_DNS_ERROR;
smDDNS = SM_DNS_ERROR;
break;
}
// resolve the remote server
if(DDNSClient.ROMPointers.CheckIPServer)
{
TCPIP_DNS_Resolve((const char*)DDNSClient.CheckIPServer.szROM, DNS_TYPE_A);
}
else
{
TCPIP_DNS_Resolve((const char*)DDNSClient.CheckIPServer.szRAM, DNS_TYPE_A);
}
smDDNS++;
break;
case SM_DNS_WAIT_RESOLVE:
if(DDNSClient.ROMPointers.CheckIPServer)
{
dnsRes = TCPIP_DNS_IsResolved((const char*)DDNSClient.CheckIPServer.szROM, &ddnsServerIP);
}
else
{
dnsRes = TCPIP_DNS_IsResolved((const char*)DDNSClient.CheckIPServer.szRAM, &ddnsServerIP);
}
if(dnsRes == DNS_RES_PENDING)
{ // ongoing operation;
break;
}
TCPIP_DNS_UsageEnd(netH);
if(dnsRes < 0)
{ // some DNS error occurred; retry later
lastStatus = DDNS_STATUS_DNS_ERROR;
smDDNS = SM_DNS_ERROR;
break;
}
// server IP solved
// open the client socket
MySocket = TCPIP_TCP_ClientOpen(IP_ADDRESS_TYPE_IPV4, DDNSClient.CheckIPPort, (IP_MULTI_ADDRESS*)&ddnsServerIP);
// If no socket available, try again later
if(MySocket == INVALID_SOCKET)
{
lastStatus = DDNS_STATUS_SKT_ERROR;
smDDNS = SM_SKT_ERROR;
break;
}
// socket opened OK
smDDNS++;
DDnsTimer = SYS_TICK_Get();
break;
case SM_CHECKIP_SKT_OBTAINED:
// Wait for the remote server to accept our connection request
if(!TCPIP_TCP_IsConnected(MySocket))
{
// Time out if too much time is spent in this state
if(SYS_TICK_Get()-DDnsTimer > 6*SYS_TICK_TicksPerSecondGet())
{
// Close the socket so it can be used by other modules
// We will retry soon
TCPIP_TCP_Close(MySocket);
MySocket = INVALID_SOCKET;
lastStatus = DDNS_STATUS_CHECKIP_ERROR;
smDDNS = SM_SOFT_ERROR;
}
break;
}
DDnsTimer = SYS_TICK_Get();
// Make certain the socket can be written to
if(TCPIP_TCP_PutIsReady(MySocket) < 125u)//125 = size of TCP Tx buffer
break;
// Transmit the request to the server
TCPIP_TCP_StringPut(MySocket, (const uint8_t*)"GET / HTTP/1.0\r\nHost: ");
if(DDNSClient.ROMPointers.CheckIPServer)
{
TCPIP_TCP_StringPut(MySocket, DDNSClient.CheckIPServer.szROM);
}
else
{
TCPIP_TCP_StringPut(MySocket, DDNSClient.CheckIPServer.szRAM);
}
TCPIP_TCP_StringPut(MySocket, (const uint8_t*)"\r\nConnection: close\r\n\r\n");
// Send the packet
TCPIP_TCP_Flush(MySocket);
smDDNS++;
break;
case SM_CHECKIP_FIND_DELIMITER:
// Check if remote node is still connected. If not, force to the disconnect state,
// but don't break because data may still be waiting.
if(!TCPIP_TCP_IsConnected(MySocket) || SYS_TICK_Get() - DDnsTimer > 6*SYS_TICK_TicksPerSecondGet())
smDDNS = SM_CHECKIP_DISCONNECT;
// Search out the "Address: " delimiter in the response
wPos = TCPIP_TCP_ArrayFind(MySocket, (const uint8_t*)"Address: ", 9, 0, 0, false);
// If not yet found, clear as much as possible and break
if(wPos == 0xffff)
{
wPos = TCPIP_TCP_GetIsReady(MySocket);
if(wPos > 9u)
TCPIP_TCP_ArrayGet(MySocket, NULL, wPos - 9);
break;
}
// Clear up to and past that string
TCPIP_TCP_ArrayGet(MySocket, NULL, wPos + 9);
// Continue on to read the IP
DDnsTimer = SYS_TICK_Get();
smDDNS++;
case SM_CHECKIP_FIND_ADDRESS:
// Check if remote node is still connected. If not, force to the disconnect state,
// but don't break because data may still be waiting.
if(!TCPIP_TCP_IsConnected(MySocket) || SYS_TICK_Get() - DDnsTimer > 6*SYS_TICK_TicksPerSecondGet())
smDDNS = SM_CHECKIP_DISCONNECT;
// Search out the "</body>" delimiter in the response
wPos = TCPIP_TCP_ArrayFind(MySocket, (const uint8_t*)"</body>", 7, 0, 0, false);
// If not yet found, break
if(wPos == 0xffff)
break;
// Read and terminate that string as the IP address (preventing buffer overflows)
if(wPos > 15u)
wPos = 15;
TCPIP_TCP_ArrayGet(MySocket, vBuffer, wPos);
vBuffer[wPos] = '\0';
// Parse the IP address that was read, invalidating on failure
if(!TCPIP_Helper_StringToIPAddress((char*)vBuffer, &ipParsed))
vBuffer[0] = '\0';
// Continue on to close the socket
case SM_CHECKIP_DISCONNECT:
// Close the socket
TCPIP_TCP_Close(MySocket);
MySocket = INVALID_SOCKET;
// Determine if an update is necessary
if(vBuffer[0] == '\0')
{// CheckIP Failed
lastStatus = DDNS_STATUS_CHECKIP_ERROR;
smDDNS = SM_SOFT_ERROR;
break;
}
if( (ipParsed.Val ==lastKnownIP.Val) && (!bForceUpdate))
{
// IP address has not changed and no update is forced
lastStatus = DDNS_STATUS_UNCHANGED;
smDDNS = SM_DONE;
break;
}
// Need to perform an update
lastKnownIP = ipParsed;
bForceUpdate = false;
smDDNS++;
break;
case SM_IP_UPDATE_HOME:
netH = TCPIP_STACK_NetDefaultGet();
if(TCPIP_DNS_UsageBegin(netH) != DNS_RES_OK)
{ // wait some more
break;
}
// resolve the remote update server
if(DDNSClient.ROMPointers.UpdateServer)
{
TCPIP_DNS_Resolve((const char*)DDNSClient.UpdateServer.szROM, DNS_TYPE_A);
}
else
{
TCPIP_DNS_Resolve((const char*)DDNSClient.UpdateServer.szRAM, DNS_TYPE_A);
}
smDDNS++;
break;
case SM_IP_UPDATE_WAIT_DNS:
if(DDNSClient.ROMPointers.UpdateServer)
{
dnsRes = TCPIP_DNS_IsResolved((const char*)DDNSClient.UpdateServer.szROM, &ddnsUpdateIP);
}
else
{
dnsRes = TCPIP_DNS_IsResolved((const char*)DDNSClient.UpdateServer.szRAM, &ddnsUpdateIP);
}
if(dnsRes == DNS_RES_PENDING)
{ // ongoing operation;
break;
}
TCPIP_DNS_UsageEnd(netH);
if(dnsRes < 0)
{ // some DNS error occurred; retry later
lastStatus = DDNS_STATUS_DNS_ERROR;
smDDNS = SM_DNS_ERROR;
break;
}
// update server IP solved
// open the client socket to the update server
MySocket = TCPIP_TCP_ClientOpen(IP_ADDRESS_TYPE_IPV4, DDNSClient.UpdatePort, (IP_MULTI_ADDRESS*)&ddnsUpdateIP);
// If no socket available, try again later
if(MySocket == INVALID_SOCKET)
{
lastStatus = DDNS_STATUS_SKT_ERROR;
smDDNS = SM_SKT_ERROR;
break;
}
// socket opened OK
// Move on to the next state
smDDNS++;
DDnsTimer = SYS_TICK_Get();
break;
case SM_IP_UPDATE_SKT_OBTAINED:
// Wait for the remote server to accept our connection request
if(!TCPIP_TCP_IsConnected(MySocket))
{
// Time out if too much time is spent in this state
if(SYS_TICK_Get() - DDnsTimer > 6*SYS_TICK_TicksPerSecondGet())
{
// Close the socket so it can be used by other modules
// We will try again immediately
TCPIP_TCP_Close(MySocket);
MySocket = INVALID_SOCKET;
lastStatus = DDNS_STATUS_UPDATE_ERROR;
smDDNS--;
}
break;
}
// Reset timer and begin sending the request
DDnsTimer = SYS_TICK_Get();
smDDNS++;
// No break needed...try to send first bit immediately.
case SM_IP_UPDATE_REQ_A:
// Check for lost connections or timeouts
if(!TCPIP_TCP_IsConnected(MySocket) || (SYS_TICK_Get() - DDnsTimer > 10*SYS_TICK_TicksPerSecondGet()))
{
lastStatus = DDNS_STATUS_UPDATE_ERROR;
smDDNS = SM_IPUDATE_DISCONNECT;
break;
}
if(TCPIP_TCP_PutIsReady(MySocket) < 25u) // 25 =~ 16+9
break;
TCPIP_TCP_StringPut(MySocket, (const uint8_t*)"GET /nic/update?hostname=");
smDDNS++;
// No break needed...try to send next bit immediately.
case SM_IP_UPDATE_REQ_B:
// Check for lost connections or timeouts
if(!TCPIP_TCP_IsConnected(MySocket) || (SYS_TICK_Get() - DDnsTimer > 10*SYS_TICK_TicksPerSecondGet()))
{
lastStatus = DDNS_STATUS_UPDATE_ERROR;
smDDNS = SM_IPUDATE_DISCONNECT;
break;
}
// Try to write, verifying that space is available first
if(DDNSClient.ROMPointers.Host)
{
if(TCPIP_TCP_PutIsReady(MySocket) < strlen((const char*)DDNSClient.Host.szROM))
break;
TCPIP_TCP_StringPut(MySocket,DDNSClient.Host.szROM);
}
else
{
if(TCPIP_TCP_PutIsReady(MySocket) < strlen((char*)DDNSClient.Host.szRAM))
break;
TCPIP_TCP_StringPut(MySocket,DDNSClient.Host.szRAM);
}
smDDNS++;
// No break needed...try to send next bit immediately.
case SM_IP_UPDATE_REQ_C:
// Check for lost connections or timeouts
if(!TCPIP_TCP_IsConnected(MySocket) || SYS_TICK_Get() - DDnsTimer > 10*SYS_TICK_TicksPerSecondGet())
{
lastStatus = DDNS_STATUS_UPDATE_ERROR;
smDDNS = SM_IPUDATE_DISCONNECT;
break;
}
if(TCPIP_TCP_PutIsReady(MySocket) < 70u)
break;
TCPIP_TCP_StringPut(MySocket, (const uint8_t*)"&myip=");
TCPIP_TCP_StringPut(MySocket, vBuffer);
TCPIP_TCP_StringPut(MySocket, (const uint8_t*)"&wildcard=NOCHG&mx=NOCHG&backmx=NOCHG HTTP/1.0");
TCPIP_TCP_Flush(MySocket);
smDDNS++;
// No break needed...try to send next bit immediately.
case SM_IP_UPDATE_REQ_D:
// Check for lost connections or timeouts
if(!TCPIP_TCP_IsConnected(MySocket) || SYS_TICK_Get() - DDnsTimer > 10*SYS_TICK_TicksPerSecondGet())
{
lastStatus = DDNS_STATUS_UPDATE_ERROR;
smDDNS = SM_IPUDATE_DISCONNECT;
break;
}
if(TCPIP_TCP_PutIsReady(MySocket) < 131u) // 131 =~ 8+23 + dynamic dns server hostname
break;
TCPIP_TCP_StringPut(MySocket, (const uint8_t*)"\r\nHost: ");//8
if(DDNSClient.ROMPointers.UpdateServer)
TCPIP_TCP_StringPut(MySocket,DDNSClient.UpdateServer.szROM);
else
TCPIP_TCP_StringPut(MySocket,DDNSClient.UpdateServer.szRAM);
TCPIP_TCP_StringPut(MySocket, (const uint8_t*)"\r\nAuthorization: Basic ");//23
TCPIP_TCP_Flush(MySocket);
smDDNS++;
// No break needed...try to send the next bit immediately.
case SM_IP_UPDATE_REQ_E:
// Check for lost connections or timeouts
if(!TCPIP_TCP_IsConnected(MySocket) || SYS_TICK_Get() - DDnsTimer > 6*SYS_TICK_TicksPerSecondGet())
{
lastStatus = DDNS_STATUS_UPDATE_ERROR;
smDDNS = SM_IPUDATE_DISCONNECT;
break;
}
// User name and passwords for DynDNS.org can each be up to 24 characters
// Base64 encoded data is always at least 25% bigger than the original
if(TCPIP_TCP_PutIsReady(MySocket) < 100u)
break;
if(DDNSClient.ROMPointers.Username)
{
ROMStrPtr = (const char*)DDNSClient.Username.szROM;
wPos = strlen(ROMStrPtr);
}
else
{
RAMStrPtr = (char*)DDNSClient.Username.szRAM;
wPos = strlen((char*)RAMStrPtr);
}
i = 0;
while(wPos)
{
while(i < wPos && i < 3u)
{
if(DDNSClient.ROMPointers.Username)
vBuffer[i] = *ROMStrPtr++;
else
vBuffer[i] = *RAMStrPtr++;
i++;
}
wPos -= i;
if(i == 3u)
{
TCPIP_Helper_Base64Encode(vBuffer, i, vBuffer, 4);
TCPIP_TCP_ArrayPut(MySocket, vBuffer, 4);
i = 0;
}
}
if(DDNSClient.ROMPointers.Password)
{
ROMStrPtr = (const char*)DDNSClient.Password.szROM;
wPos = strlen(ROMStrPtr);
}
else
{
RAMStrPtr = (char*)DDNSClient.Password.szRAM;
wPos = strlen((char*)RAMStrPtr);
}
// Increment for the ':' separator and i for bytes left in username
wPos += i + 1;
vBuffer[i++] = ':';
while(wPos)
{
while(i < wPos && i < 3u)
{
if(DDNSClient.ROMPointers.Password)
vBuffer[i] = *ROMStrPtr++;
else
vBuffer[i] = *RAMStrPtr++;
i++;
}
wPos -= i;
TCPIP_Helper_Base64Encode(vBuffer, i, vBuffer, 4);
TCPIP_TCP_ArrayPut(MySocket, vBuffer, 4);
i = 0;
}
TCPIP_TCP_Flush(MySocket);
smDDNS++;
break;
case SM_IP_UPDATE_REQ_F:
// Check for lost connections or timeouts
if(!TCPIP_TCP_IsConnected(MySocket) || SYS_TICK_Get() - DDnsTimer > 10*SYS_TICK_TicksPerSecondGet())
{
lastStatus = DDNS_STATUS_UPDATE_ERROR;
smDDNS = SM_IPUDATE_DISCONNECT;
break;
}
if(TCPIP_TCP_PutIsReady(MySocket) < 50u)
break;
TCPIP_TCP_StringPut(MySocket, (const uint8_t*)"\r\nUser-Agent: Microchip - TCPIPSTACK - "TCPIP_STACK_VERSION"\r\n\r\n");
TCPIP_TCP_Flush(MySocket);
smDDNS++;
// Reset the timer to wait for a response
DDnsTimer = SYS_TICK_Get();
break;
case SM_IPUPDATE_FIND_RESPONSE:
// Locate the response string
// Wait up to 10 seconds for a response
if(SYS_TICK_Get() - DDnsTimer > 10*SYS_TICK_TicksPerSecondGet())
{
lastStatus = DDNS_STATUS_UPDATE_ERROR;
smDDNS = SM_IPUDATE_DISCONNECT;
break;
}
// According to HTTP, the response will start after the two CRLFs
wPos = TCPIP_TCP_ArrayFind(MySocket, (const uint8_t*)"\r\n\r\n", 4, 0, 0, false);
// If not yet found, eliminate everything up to
if(wPos == 0xffff)
{
wPos = TCPIP_TCP_GetIsReady(MySocket);
if(wPos > 4u)
TCPIP_TCP_ArrayGet(MySocket, NULL, wPos - 4);
break;
}
TCPIP_TCP_ArrayGet(MySocket, NULL, wPos+4);
smDDNS++;
// No break...continue to next state immediately
case SM_IPUPDATE_PARSE_RESPONSE:
// Try to parse the response text
// Wait up to 10 seconds for the remote server to disconnect
// so we know all data has been received
if(TCPIP_TCP_IsConnected(MySocket) && SYS_TICK_Get() - DDnsTimer < 10*SYS_TICK_TicksPerSecondGet())
break;
// Read the response code
wPos = TCPIP_TCP_GetIsReady(MySocket);
if(wPos > sizeof(vBuffer) - 1)
wPos = sizeof(vBuffer) - 1;
wPos = TCPIP_TCP_ArrayGet(MySocket, vBuffer, wPos);
vBuffer[wPos] = '\0';
for(i = 0; i < sizeof(vBuffer); i++)
if(vBuffer[i] == ' ')
vBuffer[i] = '\0';
for(lastStatus = 0; lastStatus < DDNS_STATUS_UPDATE_ERROR; lastStatus++)
if(!strcmp((char*)vBuffer, (const char*)_updateIpSrvrResponse[lastStatus]))
break;
smDDNS++;
// No break...continue to finalization
case SM_IPUDATE_DISCONNECT:
// Close the socket so it can be used by other modules.
if(MySocket != INVALID_SOCKET)
{
TCPIP_TCP_Close(MySocket);
MySocket = INVALID_SOCKET;
}
// Determine what to do based on status
if(lastStatus <= DDNS_STATUS_NUMHOST || lastStatus == DDNS_STATUS_UNCHANGED)
smDDNS = SM_DONE;
else if(lastStatus == DDNS_STATUS_911 || lastStatus == DDNS_STATUS_DNSERR)
smDDNS = SM_SYSTEM_ERROR;
else
smDDNS = SM_SOFT_ERROR;
smDDNS++;
break;
case SM_DONE:
dwUpdateAt = SYS_TICK_Get() + 10*60*SYS_TICK_TicksPerSecondGet(); // 10 minutes
smDDNS = SM_IDLE;
break;
case SM_SOFT_ERROR:
case SM_DNS_ERROR:
case SM_SKT_ERROR:
dwUpdateAt = SYS_TICK_Get() + 30*SYS_TICK_TicksPerSecondGet(); // 30 seconds
smDDNS = SM_IDLE;
break;
case SM_SYSTEM_ERROR:
dwUpdateAt = SYS_TICK_Get() + 30*60*SYS_TICK_TicksPerSecondGet(); // 30 minutes
smDDNS = SM_IDLE;
break;
}
}