RIP实验源代码.doc

RIP.txt#include sysinclude.h#include extern void rip_sendIpPkt(unsigned char* pData, UINT16 len, unsigned short dstPort, UINT8 iNo);/*RIP*/extern struct stud_rip_route_node *g_rip_route_table;/*/typedef struct _packet_header /*RIP*/unsigned char command;/*REQUESTRESONSE*/unsigned char version;/*12*/unsigned short pad0;/*/ packet_header;typedef struct _packet_data/*RIP*/unsigned short addrfamily;/*2*/unsigned short routetag;/*/unsigned int ipaddr;/*IP*/unsigned int netmask;/*/unsigned int nexthop;/*/unsigned int metric;/*/ packet_data;#define DECLAREERROR(pkt,type) printf(Discard because %dn,type);ip_DiscardPkt(pkt,type);return 0;/*RIP*/unsigned char buffer256;/*/void dumpPkt(unsigned char*buf,int len)/*/printf(Dumping sending packets:n);int l=0;for (int i=0;iif_no=iNo|pnow-metric=16)pnow=pnow-next;/*/do/*RIP*/packet_header*ph=(packet_header*)buffer;ph-command=2; /*RESPONSE*/ph-version=version; /*/ph-pad0=0; /*0*/*/int pCount=0;while (pCountaddrfamily=htons(2); pd-routetag=0; pd-ipaddr=htonl(pnow-dest);if (version=2)pd-netmask=htonl(pnow-mask);elsepd-netmask=0;if (version=2)pd-nexthop=htonl(pnow-nexthop);elsepd-nexthop=0;pd-metric=htonl(pnow-metric);pCount+;do pnow=pnow-next; while (pnow&(pnow-if_no=iNo|pnow-metric=16);/*/dumpPkt(buffer,sizeof(packet_header)+sizeof(packet_data)*pCount);rip_sendIpPkt(buffer,sizeof(packet_header)+sizeof(packet_data)*pCount,520,iNo); while (pnow);#include char*clone(char*org,int len)/*/char*t=(char*)malloc(len);memmove(t,org,len);return t;int stud_rip_packet_recv(char*pBuffer, int bufferSize, UINT8 iNo, UINT32 srcAdd)pBuffer=clone(pBuffer,bufferSize);/*/packet_header*ph=(packet_header*)pBuffer;if (ph-command!=1&ph-command!=2) DECLAREERROR(pBuffer,STUD_RIP_TEST_COMMAND_ERROR);if (ph-version!=1&ph-version!=2) DECLAREERROR(pBuffer,STUD_RIP_TEST_VERSION_ERROR);if (ph-pad0!=0) DECLAREERROR(pBuffer,STUD_RIP_TEST_COMMAND_ERROR);if (ph-command=1)/*REQUEST*/printf(Get valid requestn);MakePacket(ph-version,iNo);else/*RESPONSE*/dumpPkt(unsigned char*)pBuffer,bufferSize);/*/int snums=(bufferSize-sizeof(packet_header)/sizeof(packet_data);/*RIP*/for (int i=0;iipaddr=ntohl(pd-ipaddr);pd-netmask=ntohl(pd-netmask);pd-nexthop=ntohl(pd-nexthop);pd-metric=ntohl(pd-metric);/*RIP*/stud_rip_route_node*hd=g_rip_route_table;dumpPkt(unsigned char*)pd,sizeof(packet_data);int hdcount=0;while (hd) if (hd-dest=pd-ipaddr&hd-mask=pd-netmask) break;hd=hd-next;hdcount+;do/*RIP*/if (hd) /*/printf(Match at %d and nexthop %xn,hdcount,hd-nexthop);if (hd-nexthop!=pd-nexthop)if (hd-metricpd-metric)hd-metric=pd-metric+1;/*/hd-nexthop=pd-nexthop;/*/hd-if_no=iNo;break;/*RIP*/hd-metric=pd-metric+1;hd-nexthop=pd-nexthop;hd-if_no=iNo;/*161616*/if (hd-metric16)hd-metric=16;else /*/printf(Unmatched.n);if (pd-metric=16) break;/*16*/stud_rip_route_node* nhd=(stud_rip_route_node*)malloc(sizeof(stud_rip_route_node);/*/nhd-dest=pd-ipaddr;nhd-mask=pd-netmask;nhd-nexthop=pd-nexthop;nhd-metric=pd-metric+1;/*1*/nhd-if_no=iNo;nhd-next=g_rip_route_table;/*/g_rip_route_table=nhd; while (false);/*/void stud_rip_route_timeout(UINT32 destAdd, UINT32 mask, unsigned char msgType)if (msgType=RIP_MSG_SEND_ROUTE)/*/MakePacket(2,1);MakePac