Linux Linux program Exercise 11 (Network programming large file send UDP version)

//Network Programming Sender--Large file Transfer (UDP)#include <stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<errno.h>#include<sys/types.h>#include<sys/socket.h>#include<netinet/inch.h>#include<arpa/inet.h>intMainintArgChar*args[]) {    if(Arg <3) {printf ("Please print the param! \ n"); return-1; }    intPort = atoi (args[2]); intST = socket (af_inet, SOCK_DGRAM,0); if(St = =-1) {printf ("Create socket failed! Error message:%s\n", Strerror (errno)); return-1; }    structsockaddr_in addr; memset (&AMP;ADDR,0,sizeof(addr)); Addr.sin_family=af_inet; Addr.sin_port=htons (port); Addr.sin_addr.s_addr= Inet_addr (args[1]); Charbuf[1024x768] = {0 }; intnum =0; //Open the file streamFILE *PFR =NULL; intindex=0; PFR= fopen ("/home/test/2/1.dat","R"); if(PFR = =NULL) {printf ("Open the file failed! Error message:%s\n", Strerror (errno)); GotoEND; }     while(num = fread (buf,sizeof(Char),sizeof(BUF), PFR) >0)    {        if(SendTo (St, buf,sizeof(Char) *num,0, (structSOCKADDR *) &addr,sizeof(addr)) == -1) {printf ("SendTo failed! Error message:%s\n", Strerror (errno));  Break; } printf ("Read%d num=%d\n", index++, num);    } fclose (PFR);    End:close (ST); return 0;}

//Network programming Receiver--Large file Transfer (UDP)#include <stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<errno.h>#include<sys/types.h>#include<sys/socket.h>#include<netinet/inch.h>#include<arpa/inet.h>intMainintArgChar*args[]) {    if(Arg <2) {printf ("Please print one param! \ n"); return-1; }    intPort=atoi (args[1]); intST = socket (af_inet, SOCK_DGRAM,0); if(St = =-1) {printf ("Create socket failed! Error message:%s \ n", Strerror (errno)); return-1; }    structsockaddr_in addr; memset (&AMP;ADDR,0,sizeof(addr)); Addr.sin_family=af_inet; Addr.sin_port=htons (port); Addr.sin_addr.s_addr=htonl (Inaddr_any); if(Bind (St, (structSOCKADDR *) &addr,sizeof(addr)) ==-1) {printf ("bind IP failed! Error message:%s \ n", Strerror (errno)); GotoEND; }    structsockaddr_in client_addr; socklen_t Client_addrlen=sizeof(CLIENT_ADDR); Charbuf[1024x768]={0}; intnum=0; intindex=0; //define the file streamFILE * pfa=NULL; //Open the file in Append modePfa=fopen ("/home/test/3/1.dat","a"); if(pfa==NULL) {printf ("Open the file failed! Error message:%s\n", Strerror (errno)); GotoEND; }     while(1) {memset (&AMP;CLIENT_ADDR,0,sizeof(CLIENT_ADDR)); Num=recvfrom (St,buf,sizeof(BUF),0,(structSOCKADDR *) &client_addr,&Client_addrlen); if(num==-1) {printf ("Recvform failed! Error message:%s\n", Strerror (errno));  Break; }        /*even if the sender is closed, the Recvfrom function will not return 0, but will continue to block the process*/        /*else if (num==0) {printf ("The other side sockets is closed!\n");        Break }        */printf ("recv%d num=%d\n", index++, num); Fwrite (BUF,sizeof(Char), NUM,PFA); if(num<1024x768) {printf ("recv last! \ n");  Break; } memset (BUF,0,sizeof(BUF));    } fclose (PFA);    End:close (ST); return 0;}

. Suffixes:.c. OCC=gccSRCS1=UDPRECV.CSRCS2=udpsend.cobjs1=$ (srcs1:.c=. O) OBJS2=$ (srcs2:.c=. O) EXEC1=mrecvEXEC2=msendstart:$ (OBJS1) $ (OBJS2) $ (CC)-o $ (EXEC1) $ (OBJS1) $ (CC)-o $ (EXEC2) $ (OBJS2) @echo"-------OK-----------". C.O: $ (CC)-WALL-G-o [email protected]-C $<Clean:rm-F $ (OBJS1) RM-F $ (EXEC1) RM-F $ (OBJS2) RM-F $ (EXEC2)

Summary: The UDP transport protocol does appear to drop packets, far from the TCP/IP protocol security, as can be seen.

Linux Linux program Exercise 11 (Network programming large file send UDP version)