1、 - | Opcode | Block # | #define TFTP_ACK 4 /*Acknowledgment (ACK)*/ /*ERROR packet format 2 bytes 2 bytes string 1 byte - | Opcode | ErrorCode | ErrMsg | 0 | #define TFTP_ERROR 5 /*Error (ERROR)*/ #define TFTP_NETASCII 0 #define TFTP_OCTET 1 #define TFTP_WSTAT_FIRSTACKE 0 #define TFTP_WSTAT_NEXTACK
2、1 #define TFTP_WSTAT_LASTACK 2 #define MAX_RETRY 3 #define TFTP_NOTEND_DATALEN 512+2+2 #ifdef _VC #pragma comment(lib,Wsock32.lib) /*typedef void (* CMDFUNC)(char 256,int pcout);typedef struct _cmdnum char *cmd; int num; int paramcount; CMDFUNC callback;CMDNUM,*PCMDNUM;typedef struct DATA int socknu
3、m; char *filename; unsigned short remoteport; char *remoteaddr;DATA passdata6;ofstream logfile(log.txt,ios:app);int makeack(unsigned short num,char *buffer,int size);void showsysinfo();void getfile(DATA *needdata);void putfile(DATA *needdata);int makeerror(int errcode,char errstring256,char *buffer,
4、int bufsize);SOCKET sock6=INVALID_SOCKET,INVALID_SOCKET,INVALID_SOCKET,INVALID_SOCKET,INVALID_SOCKET,INVALID_SOCKET;int filemode =TFTP_OCTET;#define MYPORT 69 void main(int argc,char *argv) WSADATA stWSAData; int ret=0; sockaddr_in addr; char recvbuf1024=0; char sendbuf1024=0; sockaddr_in from; sock
5、addr_in newaddr; int fromlen=0; char filename256; int i,len; DWORD ThreadID6; showsysinfo(); if(WSAStartup(WSA_VERSION,&stWSAData)!=0) printf(cant start socket rn); exit(0); if (sock0=socket(AF_INET,SOCK_DGRAM,0)0) perror(socket exit(1); addr.sin_family=AF_INET; addr.sin_port=htons(MYPORT); addr.sin
6、_addr.s_addr=INADDR_ANY; memset(&(addr.sin_zero),0,8); if (bind(sock0,(struct sockaddr *)&addr,sizeof(struct sockaddr)bind for (;) fromlen=sizeof(from); recvfrom(sock0,recvbuf,sizeof(recvbuf),0,(sockaddr *)&from,&fromlen); if (recvbuf0=0 & recvbuf1 for (i=0;i+) filenamei=recvbufi+2; if (filenamei=0)
7、 break; for (i=1;i=5;i+) if (socki=INVALID_SOCKET) passdatai.socknum=i; if (socki=socket(AF_INET,SOCK_DGRAM,0) newaddr.sin_family=AF_INET; newaddr.sin_port=0; newaddr.sin_addr.s_addr=INADDR_ANY;(newaddr.sin_zero),0,8); if (bind(socki,(struct sockaddr *)&newaddr,sizeof(struct sockaddr)8); bufferpos=(
8、char)num; return pos;int makedata(int num,char *data,int datasize,char *buffer,int bufsize) bufferpos=TFTP_DATA; memcpy(&bufferpos,data,datasize); pos=pos+datasize;int makeerror(int errcode,char *errstring,char *buffer,int bufsize) int i; bufferpos=TFTP_ERROR; bufferpos=(char)(errcode bufferpos=(cha
9、r)errcode; for(i=0; bufferpos=errstringi; if (errstringi=void getfile(DATA *needdata) int len=0;/ fd_set fdr; int retry=0;/ struct timeval timeout=5,0; int stat=0; int lastdata=0; long flen=0; FILE *file; from.sin_family=AF_INET; addr.sin_port=htons(needdata-remoteport); addr.sin_addr.s_addr=inet_ad
10、dr(needdata-remoteaddr);/ printf(received WRQ form %sn,needdata- if(file=fopen(needdata-filename,rb)!=NULL) fclose(file);file %s already existnfilename); len=makeerror(6,file already exist0 sendto(sockneeddata-socknum,sendbuf,len,0,(sockaddr *)&addr,sizeof(addr); closesocket(sockneeddata-socknum); s
11、ockneeddata-socknum=INVALID_SOCKET; return; if (file=fopen(needdata-w+b)=NULL) t create file rn len=makeack(lastdata,sendbuf,sizeof(sendbuf); ret=sendto(sockneeddata- / printf(send ack 0# to %sn while(true) /* FD_ZERO(&fdr); FD_SET(sockneeddata-socknum,& ret=select(sockneeddata-fdr,NULL,NULL,NULL);
12、if(SOCKET_ERROR=ret) socket error rn else if (0=ret) if (MAX_RETRY=retry) Time outrn retry+; if (FD_ISSET(sockneeddata-fdr) retry=0; fromlen=sizeof(sockaddr); ret=recvfrom(sockneeddata-socknum,recvbuf,sizeof(recvbuf),0,(sockaddr *)& if(0=stat) addr.sin_port=from.sin_port; stat=1; if(TFTP_DATA=recvbu
13、f1) lastdata=(recvbuf2+256)%256)*256+(recvbuf3+256)%256;received data block %d# from %sn,lastdata,needdata-send ack %d# to %sn if(ret logfile received filename from remoteaddrrnendl;recvbuf4,1,512,file); flen=flen+512;%d byte receivedr,flen); / void putfile(DATA *needdata) char databuf1024=0; fd_set
14、 fdr; struct timeval timeout=5,0; int stat=TFTP_WSTAT_NEXTACK; int lastack=0; int flen=0; int blocknum=0; size_t rlen=0;received RRQ form %snfile %s not foundrn len=makeerror(1,file not found0 rlen=fread(databuf,1,512,file); if (rlen for(; FD_ZERO(&fdr,NULL,NULL,&timeout);socket errorrntime outrn /
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