implementation IRC

Author: AdeRegt

SanderOSUSB.0

@@ -210,7 +210,7 @@ void fillTcpHeader(struct TCPHeader *tcpheader,unsigned char *destmac,unsigned s
     if(sequence_number==0x1010&&acknowledge_number==0x1010){
         sequence_number = taaaX;
         acknowledge_number = taaaY;
-    }else{
+    }else if(flags&TCP_ACK){
         taaaX = sequence_number;
         taaaY = acknowledge_number;
     }
@@ -226,7 +226,7 @@ void fillTcpHeader(struct TCPHeader *tcpheader,unsigned char *destmac,unsigned s
     int payload = ( size - (sizeof(struct TCPHeader) - sizeof(struct EthernetHeader)) );
     unsigned char *start = (unsigned char*)malloc(sizeof(struct tcp_checksum_header) + payload);
     unsigned char *end = start;
-    end += (sizeof(struct tcp_checksum_header) + payload);
+    end += (sizeof(struct tcp_checksum_header));
 
     struct tcp_checksum_header* trx = (struct tcp_checksum_header*)start;
     trx->dst = (to);

boot/pxe/pxeentry.bin

@@ -320,7 +320,7 @@ void special_handler(Register *r){
 		unsigned char* addr = (unsigned char*) r->edx;
 		unsigned int loca = r->esi;
 		unsigned int port = r->edi;
-		debugf("INT0x80: SENDNETWORKPACKAGE type=%x size=%x to=%d:%d:%d:%d where=%x port=%x\n",type,size,addr[0],addr[1],addr[2],addr[3],loca,port);
+		debugf("INT0x80: SENDNETWORKPACKAGE type=%x size=%x to=%d.%d.%d.%d where=%x port=%x\n",type,size,addr[0],addr[1],addr[2],addr[3],loca,port);
 
 		unsigned char macaddrto[SIZE_OF_MAC];
 		unsigned char* m1;
@@ -340,16 +340,31 @@ void special_handler(Register *r){
 
 			int calbuffersize = sizeof(struct TCPHeader)+size;
 			void *pnt = (void*) malloc(calbuffersize);
-			struct TCPHeader *udp = (struct TCPHeader*) pnt;
+			struct TCPHeader *tcp = (struct TCPHeader*) pnt;
 			unsigned char* from = (unsigned char*) pnt;
 			unsigned char* to = (unsigned char*) loca;
 			for(int i = 0 ; i < size ; i++){
 				from[sizeof(struct TCPHeader)+i] = to[i];
-				debugf("%c ",to[i]);
 			}
-			debugf("\n");
 
-			fillTcpHeader(udp,(unsigned char*)&macaddrto,calbuffersize-sizeof(struct EthernetHeader),getOurIpAsLong(),((unsigned long*) r->edx)[0],port,port,0x1010,0x1010,5,TCP_PUS | TCP_ACK,0xffd7);
+			fillTcpHeader(tcp,(unsigned char*)&macaddrto,calbuffersize-sizeof(struct EthernetHeader),getOurIpAsLong(),((unsigned long*) r->edx)[0],port,port,0x1010,0x1010,5,TCP_PUS | TCP_ACK,64240);
+
+			unsigned short* tw = (unsigned short*) loca;
+			unsigned int z = 0;
+			for(int i = 0 ; i < (size/2) ; i++){
+				unsigned short qw = switch_endian16(tw[i]);
+				z += qw;
+			}
+
+			unsigned short checksum_old = switch_endian16(~tcp->checksum);
+			unsigned int checksum_comp = checksum_old + z;
+			unsigned int checksum = (checksum_comp & 0xffff) + (checksum_comp >> 16);
+    		checksum += (checksum >> 16);
+
+    		unsigned short final = ~checksum;
+
+    		unsigned short chsm = switch_endian16(final);
+			tcp->checksum = chsm;
 
 			PackageRecievedDescriptor prd;
 			prd.buffersize = calbuffersize;

cdrom.iso

@@ -560,6 +560,8 @@ void fillUdpHeader(struct UDPHeader *udpheader, unsigned char *destmac, unsigned
 void fillTcpHeader(struct TCPHeader *tcpheader,unsigned char *destmac,unsigned short size,unsigned long from,unsigned long to,unsigned short from_port,unsigned short to_port,unsigned long sequence_number,unsigned long acknowledge_number,unsigned char header_length,unsigned short flags,unsigned short window);
 unsigned long getOurIpAsLong();
 PackageRecievedDescriptor getEthernetPackage();
+unsigned short switch_endian16(unsigned short nb);
+unsigned long switch_endian32(unsigned long num);
 
 typedef struct  {
     unsigned char bRequestType;

include/symbols.h

@@ -6,8 +6,9 @@
 
 #define DEFAULT_IRC_PORT 6667
 #define DEFAULT_IRC_ADDR "chat.freenode.net"
+#define MESSAGEBUFFER 25
 
-volatile unsigned char w1 = 0;
+unsigned char *addressip;
 
 unsigned char* getIPFromName(char* t);
 
@@ -19,15 +20,42 @@ void recievemessage(unsigned long addr,unsigned long count){
     write(1, (const char *)&t, 1);
 }
 
-void sendUsername(char* username){}
-void sendNickname(char* nickname){}
+char* getline(){
+    char* message = malloc(MESSAGEBUFFER);
+    int i = 0;
+    for(i = 0 ; i < MESSAGEBUFFER ; i++){
+        unsigned char y = getc((FILE*)1) & 0x000000FF;
+        message[i] = y;
+        write(1, (void *)&message[i], 1);
+        if(y=='\n'){
+            message[i+1] = 0;
+            break;
+        }
+    }
+    message[i+1] = 0;
+    return message;
+}
 
 int main(int argc, char** argv){
     printf("welcome to our irc client\n");
-    unsigned char *t = getIPFromName(DEFAULT_IRC_ADDR);//(unsigned char*) DEFAULT_IRC_ADDR;
+    addressip = getIPFromName(DEFAULT_IRC_ADDR);
+    unsigned char t4[SIZE_OF_IP];
+    t4[0] = addressip[0];
+    t4[1] = addressip[1];
+    t4[2] = addressip[2];
+    t4[3] = addressip[3];
     int tx = 0x00200000;
-    initialisenetworkpackage(2,1,t,tx,DEFAULT_IRC_PORT);
-    for(;;);
+    initialisenetworkpackage(2,1,addressip,tx,DEFAULT_IRC_PORT);
+    while(1){
+        char *z = getline();
+        size_t sizeline = strlen(z);
+        sendnetworkpackage(2,sizeline,(unsigned char*)&t4,(int)z,DEFAULT_IRC_PORT);
+        free(z);
+        unsigned char t[2];
+        t[0] = '\n';
+        t[1] = 0x00;
+        write(1, (const char *)&t, 1);
+    }
     return EXIT_SUCCESS;
 }