echoクライアント

#include<stdio.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>

#define RBUFFER 1024

void ExitError(char *message);

int main(int argc,char *argv[])
{
int		sock;
struct		sockaddr_in  echoServAddr;
unsigned short	echoServPort;
char		*ServIP;
char		*echoString;
char		echoBuffer[RBUFFER];
unsigned int	echoStringLen;
int		byteRec;
int		byteTotal;


if(argc < 3){
fprintf(stderr,"Usage %s <ServIP> <Word>\n",argv[0]);
exit(1);
}

ServIP = argv[1];
echoString = argv[2];
echoServPort = 7;

printf("send    =%s\n",echoString);


if ((sock = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP)) < 0)
ExitError("Error socket");

memset(&echoServAddr,0,sizeof(echoServAddr));
echoServAddr.sin_family = AF_INET;
echoServAddr.sin_addr.s_addr = inet_addr(ServIP);
echoServAddr.sin_port = htons(echoServPort);


if(connect(sock,(struct sockaddr *) &echoServAddr,sizeof(echoServAddr)) < 0)
ExitError("Fail connect");

echoStringLen = strlen(echoString);


if(send(sock,echoString,echoStringLen,0) != echoStringLen)
ExitError("Fail send");

byteTotal = 0;
printf("Received=");

while(byteTotal != echoStringLen){
if((byteRec = recv(sock,echoBuffer,RBUFFER-1,0)) <= 0)

ExitError("recievesize error");

byteTotal += byteRec;
echoBuffer[byteRec] = '\0';
printf(echoBuffer);
}

printf("\n");

close(sock);

return 0;

}

void ExitError(char *message)
{
perror(message);
exit (1);
}