亲爱的 StackOverflowers 同胞，
我正在做一个项目，使用 Microchip 的 TCP/IP 堆栈在我的定制（和测试）板上实现 PIC18F87J60 上的某些东西。作为测试，我编写了一些代码来建立连接，将其保持 x 秒，然后优雅地关闭它。我已经将它实现为一个有限状态机。我还没有添加发送和接收数据。
但是，我的程序无法建立连接。使用 Wireshark，我注意到我的设备通过 DHCP 成功接收了 IP 地址，并且 ARP 解析正确完成。我暂时忽略了 DNS，因为这也会出错，但我稍后会解决这个问题。我还看到第一个 SYN 数据包由我的设备发送并由服务器按应有的方式响应，但 3 次握手中的 3e 步骤出错了。确认号只是一个随机数，因此服务器会感到困惑并使用 RST 数据包重置连接。然后我的设备使用带有另一个随机序列号的 ACK 数据包确认重置，并且服务器以某种方式接受该数据包。然后服务器尝试使用 SYN 数据包再次建立连接，但我的代码不侦听传入连接，因此连接结束。
这是我的代码：
#define THIS_IS_STACK_APPLICATION
#include "TCPIP.h"
APP_CONFIG AppConfig;
ROM char serverAddress[] = "data.zienu.eu"; //unused in this codefile: DNS doesn't work yet
ROM char serverIP[] = "80.69.92.56";
short authenticationPort = 5588;
typedef enum _SOCKET_STATE {
SOCKET_DONE = 0,
SETUP_CONNECTION,
CONNECTING,
CONNECTED,
AWAITING_ANSWER,
SENDING_DATA,
CLOSE_CONNECTION,
DISCONNECTING,
DISCONNECTED
} SOCKET_STATE;
typedef struct _CONNECTION {
TCP_SOCKET socketID;
SOCKET_INFO* remoteInfo;
const char* remoteHostName;
WORD remotePort;
SOCKET_STATE state, previousState;
DWORD timeOut;
BYTE purpose;
} CONNECTION;
void InitHardware();
void AuthenticateTask();
void FTPDownloadTask();
void HandleTCPConnection(CONNECTION* connection);
ROM BYTE SerializedMACAddress[6] = {MY_DEFAULT_MAC_BYTE1, MY_DEFAULT_MAC_BYTE2, MY_DEFAULT_MAC_BYTE3, MY_DEFAULT_MAC_BYTE4, MY_DEFAULT_MAC_BYTE5, MY_DEFAULT_MAC_BYTE6};
void InitAppConfig(void) {
AppConfig.Flags.bIsDHCPEnabled = TRUE;
AppConfig.Flags.bInConfigMode = TRUE;
memcpypgm2ram((void*)&AppConfig.MyMACAddr, (ROM void*)SerializedMACAddress, sizeof(AppConfig.MyMACAddr));
AppConfig.MyIPAddr.Val = MY_DEFAULT_IP_ADDR_BYTE1 | MY_DEFAULT_IP_ADDR_BYTE2<<8ul | MY_DEFAULT_IP_ADDR_BYTE3<<16ul | MY_DEFAULT_IP_ADDR_BYTE4<<24ul;
AppConfig.DefaultIPAddr.Val = AppConfig.MyIPAddr.Val;
AppConfig.MyMask.Val = MY_DEFAULT_MASK_BYTE1 | MY_DEFAULT_MASK_BYTE2<<8ul | MY_DEFAULT_MASK_BYTE3<<16ul | MY_DEFAULT_MASK_BYTE4<<24ul;
AppConfig.DefaultMask.Val = AppConfig.MyMask.Val;
AppConfig.MyGateway.Val = MY_DEFAULT_GATE_BYTE1 | MY_DEFAULT_GATE_BYTE2<<8ul | MY_DEFAULT_GATE_BYTE3<<16ul | MY_DEFAULT_GATE_BYTE4<<24ul;
AppConfig.PrimaryDNSServer.Val = MY_DEFAULT_PRIMARY_DNS_BYTE1 | MY_DEFAULT_PRIMARY_DNS_BYTE2<<8ul | MY_DEFAULT_PRIMARY_DNS_BYTE3<<16ul | MY_DEFAULT_PRIMARY_DNS_BYTE4<<24ul;
AppConfig.SecondaryDNSServer.Val = MY_DEFAULT_SECONDARY_DNS_BYTE1 | MY_DEFAULT_SECONDARY_DNS_BYTE2<<8ul | MY_DEFAULT_SECONDARY_DNS_BYTE3<<16ul | MY_DEFAULT_SECONDARY_DNS_BYTE4<<24ul;
// Load the default NetBIOS Host Name
memcpypgm2ram(AppConfig.NetBIOSName, (ROM void*)MY_DEFAULT_HOST_NAME, 10);
FormatNetBIOSName(AppConfig.NetBIOSName);
}
void InitHardware() {
/** \var isBoot (LATH0_bit) tells the boot-interrupt handler that boot is busy */
LATHbits.LATH0 = 1;
ADCON1 |= 0x0f; // adc pins as I/0
CMCON |= 7; // Disable comperator
OSCCON = 0x04;
OSCTUNE = 0x40; //41 MHz
/******************************************************************/
// init========
// Het TRISA en TRISF register moeten goed zijn ingesteld voor de analoge input:
PORTA = 0x00;
TRISA = 0x20; /* Bit 1 and 2 are used by ethernet LEDS */
PORTB = 0x00;
TRISB = 0x00; /* output mode */
PORTC = 0x03; /* LED R en G off */
TRISC = 0xc0; /* Bit 6 and 7 are used by UART 1 */
PORTD = 0x00; /* used to display ethernetsecond_timer in DEBUG mode*/
TRISD = 0x00; /* output mode */
PORTE = 0x00;
TRISE = 0x00; /* output mode */
PORTF = 0x00;
TRISF = 0x0E; /* output mode */
PORTG = 0x00;
TRISG = 0x00;
PORTH = 0x00;
TRISH = 0x00;
/* interrupt priorities are possible with microC */
IPR1bits.ADIP = 0; //give ADC LOW interrupt priority
RCONbits.IPEN = 1; //Enable interrupt priorities
INTCON2bits.RBPU = 1; // Disable internal PORTB pull-ups
INTCONbits.GIEH = 1;
INTCONbits.GIEL = 1;
}
void interrupt low_priority LowISR(void) {
TickUpdate();
}
void interrupt HighISR(void) {
}
void HandleTCPConnection(CONNECTION* connection) {
switch(connection->state) {
case SETUP_CONNECTION:
if(!AppConfig.Flags.bInConfigMode) {
connection->socketID = TCPOpen((DWORD) (PTR_BASE)&serverIP[0], TCP_OPEN_ROM_HOST, connection->remotePort, connection->purpose);
connection->timeOut = TickGet() + TICK_SECOND * 15;
connection->previousState = SETUP_CONNECTION;
connection->state = CONNECTING;
TCPWasReset(connection->socketID);
}
break;
case CONNECTING:
if(TCPIsConnected(connection->socketID)) {
connection->previousState = CONNECTING;
connection->state = CONNECTED;
connection->remoteInfo = TCPGetRemoteInfo(connection->socketID);
connection->timeOut = TickGet() + TICK_SECOND * 10;
}
else if(TickGet() >= connection->timeOut) {
connection->previousState = CONNECTING;
connection->state = CLOSE_CONNECTION;
}
break;
case CONNECTED:
if(TickGet() >= connection->timeOut) {
connection->previousState = CONNECTED;
connection->state = CLOSE_CONNECTION;
}
else if(TCPWasReset(connection->socketID)) {
connection->previousState = CONNECTED;
connection->state = CLOSE_CONNECTION;
}
break;
case CLOSE_CONNECTION:
connection->previousState = CLOSE_CONNECTION;
connection->state = DISCONNECTING;
TCPDisconnect(connection->socketID); //Send a TCP FIN packet
connection->timeOut = TickGet() + TICK_SECOND * 5;
break;
case DISCONNECTING:
if(TCPIsConnected(connection->socketID)) {
connection->previousState = DISCONNECTING;
connection->state = DISCONNECTED;
}
else if(TickGet() >= connection->timeOut) {
TCPDisconnect(connection->socketID);
TCPDisconnect(connection->socketID); //Time out: Send a RST packet and proceed
connection->previousState = DISCONNECTING;
connection->state = DISCONNECTED;
}
break;
case DISCONNECTED:
connection->previousState = DISCONNECTED;
connection->state = SOCKET_DONE;
break;
case SOCKET_DONE:
break;
default:
break;
}
}
void main() {
InitHardware();
TickInit();
InitAppConfig();
StackInit();
CONNECTION connection;
connection.purpose = TCP_PURPOSE_CUSTOM_FTP_CMD;
connection.remoteHostName = serverIP;
connection.remotePort = authenticationPort;
connection.previousState = SOCKET_DONE;
connection.state = SETUP_CONNECTION;
while(TRUE) {
HandleTCPConnection(&connection);
StackTask();
StackApplications();
}
}
这是Wireshark 日志的屏幕截图。
在此先感谢，BitJunky
编辑：这是wireshark 转储文件。我过滤了 MAC 地址，因此部分 DHCP 进程未显示在此转储中。